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revision 1161, Wed Oct 1 23:23:01 2003 UTC revision 1296, Sun Dec 21 17:38:17 2003 UTC
# Line 25  Line 25 
25   *  along with this program; if not, write to the Free Software   *  along with this program; if not, write to the Free Software
26   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
27   *   *
28   * $Id: plugin_2pass2.c,v 1.1.2.23 2003-10-01 23:23:01 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.33 2003-12-21 17:38:17 edgomez Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38  #include <stdio.h>  #include <stdio.h>
39  #include <math.h>  #include <math.h>
40  #include <limits.h>  #include <limits.h>
# Line 37  Line 43 
43  #include "../image/image.h"  #include "../image/image.h"
44    
45  /*****************************************************************************  /*****************************************************************************
46   * Some constants   * Some default settings
47   ****************************************************************************/   ****************************************************************************/
48    
49  #define DEFAULT_KEYFRAME_BOOST 0  #define DEFAULT_KEYFRAME_BOOST 0
50  #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP  #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
 #define DEFAULT_BITRATE_PAYBACK_DELAY 250  
51  #define DEFAULT_CURVE_COMPRESSION_HIGH 0  #define DEFAULT_CURVE_COMPRESSION_HIGH 0
52  #define DEFAULT_CURVE_COMPRESSION_LOW 0  #define DEFAULT_CURVE_COMPRESSION_LOW 0
53  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
54  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
55    
56  /* Keyframe settings */  /* Keyframe settings */
 #define DEFAULT_KFTRESHOLD 10  
57  #define DEFAULT_KFREDUCTION 20  #define DEFAULT_KFREDUCTION 20
58  #define DEFAULT_MIN_KEY_INTERVAL 1  #define DEFAULT_KFTHRESHOLD 1
59    
60    /*****************************************************************************
61     * Some default constants (can be tuned)
62     ****************************************************************************/
63    
64    /* Specify the invariant part of the headers bits (header+MV)
65     * as  hlength/cst */
66    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
67    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
68    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
69    
70  /*****************************************************************************  /*****************************************************************************
71   * Structures   * Structures
# Line 63  Line 77 
77          int quant;              /* first pass quant */          int quant;              /* first pass quant */
78          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
79          int length;             /* first pass length */          int length;             /* first pass length */
80            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
81          int scaled_length;      /* scaled length */          int scaled_length;      /* scaled length */
82          int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
83            int error;
84    
85          int zone_mode;   /* XVID_ZONE_xxx */          int zone_mode;   /* XVID_ZONE_xxx */
86          double weight;          double weight;
87  } stat_t;  } twopass_stat_t;
88    
89  /* Context struct */  /* Context struct */
90  typedef struct  typedef struct
91  {  {
92          xvid_plugin_2pass2_t param;          xvid_plugin_2pass2_t param;
93    
94          /* constant statistical data */          /*----------------------------------
95             * constant statistical data
96             *--------------------------------*/
97    
98            /* Number of frames of the sequence */
99          int num_frames;          int num_frames;
         int num_keyframes;  
         uint64_t target;        /* target filesize */  
100    
101          int count[3];   /* count of each frame types */          /* Number of Intra frames of the sequence */
102          uint64_t tot_length[3];  /* total length of each frame types */          int num_keyframes;
         double avg_length[3];   /* avg */  
         int min_length[3];  /* min frame length of each frame types */  
         uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
         int max_length;     /* max frame size */  
103    
104          /* zone statistical data */          /* Target filesize to reach */
105          double avg_weight;  /* average weight */          uint64_t target;
         int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
106    
107            /* Count of each frame types */
108            int count[3];
109    
110          double curve_comp_scale;          /* Total length of each frame types (1st pass) */
111          double movie_curve;          uint64_t tot_length[3];
112            uint64_t tot_invariant[3];
113    
114            /* Average length of each frame types (used first for 1st pass data and
115             * then for scaled averages */
116            double avg_length[3];
117    
118            /* Minimum frame length allowed for each frame type */
119            int min_length[3];
120    
121            /* Total bytes per frame type once the curve has been scaled
122             * NB: advanced parameters do not change this value. This field
123             *     represents the total scaled w/o any advanced settings */
124            uint64_t tot_scaled_length[3];
125    
126            /* Maximum observed frame size observed during the first pass, the RC
127             * will try tp force all frame sizes in the second pass to be under that
128             * limit */
129            int max_length;
130    
131          /* dynamic */          /*----------------------------------
132             * Zones statistical data
133             *
134             * ToDo: Fix zones, current
135             *       implementation is buggy
136             *--------------------------------*/
137    
138            /* Average weight of the zones */
139            double avg_weight;
140    
141            /* Total length used by XVID_ZONE_QUANT zones */
142            uint64_t tot_quant;
143            uint64_t tot_quant_invariant;
144    
145            /*----------------------------------
146             * Advanced settings helper ratios
147             *--------------------------------*/
148    
149            /* This the ratio that has to be applied to all p/b frames in order
150             * to reserve/retrieve bits for/from keyframe boosting and consecutive
151             * keyframe penalty */
152            double pb_iboost_tax_ratio;
153    
154            /* This the ratio to apply to all b/p frames in order to respect the
155             * assymetric curve compression while respecting a target filesize
156             * NB: The assymetric delta gain has to be computed before this ratio
157             *     is applied, and then the delta is added to the scaled size */
158            double assymetric_tax_ratio;
159    
160            /*----------------------------------
161             * Data from the stats file kept
162             * into RAM for easy access
163             *--------------------------------*/
164    
165            /* Array of keyframe locations
166             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
167             *     keyframe */
168          int * keyframe_locations;          int * keyframe_locations;
         stat_t * stats;  
169    
170            /* Index of the last keyframe used in the keyframe_location */
171            int KF_idx;
172    
173            /* Array of all 1st pass data file -- see the twopass_stat_t structure
174             * definition for more details */
175            twopass_stat_t * stats;
176    
177            /*----------------------------------
178             * Histerysis helpers
179             *--------------------------------*/
180    
181            /* This field holds the int2float conversion errors of each quant per
182             * frame type, this allow the RC to keep track of rouding error and thus
183             * increase or decrease the chosen quant according to this residue */
184          double quant_error[3][32];          double quant_error[3][32];
185          int quant_count[32];  
186            /* This fields stores the count of each quant usage per frame type
187             * No real role but for debugging */
188            int quant_count[3][32];
189    
190            /* Last valid quantizer used per frame type, it allows quantizer
191             * increament/decreament limitation in order to avoid big image quality
192             * "jumps" */
193          int last_quant[3];          int last_quant[3];
194    
195          double curve_comp_error;          /*----------------------------------
196          int overflow;           * Overflow control
197          int KFoverflow;           *--------------------------------*/
198          int KFoverflow_partial;  
199          int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
200            double overflow;
201    
202            /* Total overflow for keyframes -- not distributed directly */
203            double KFoverflow;
204    
205            /* Amount of keyframe overflow to introduce to the global p/b frame
206             * overflow counter at each encoded frame */
207            double KFoverflow_partial;
208    
209            /* Unknown ???
210             * ToDo: description */
211          double fq_error;          double fq_error;
212    
213            /*----------------------------------
214             * Debug
215             *--------------------------------*/
216            double desired_total;
217            double real_total;
218  } rc_2pass2_t;  } rc_2pass2_t;
219    
220    
# Line 131  Line 236 
236  {  {
237          switch(opt) {          switch(opt) {
238          case XVID_PLG_INFO :          case XVID_PLG_INFO :
239            case XVID_PLG_FRAME :
240                  return 0;                  return 0;
241    
242          case XVID_PLG_CREATE :          case XVID_PLG_CREATE :
# Line 154  Line 260 
260   ****************************************************************************/   ****************************************************************************/
261    
262  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
263  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
264  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
265  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
266  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
267  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
268  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
269    #if 0
270    static void stats_print(rc_2pass2_t * rc);
271    #endif
272    
273  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
274   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 177  Line 286 
286    
287          rc->param = *param;          rc->param = *param;
288    
289          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
290  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
291          /* Let's set our defaults if needed */          /* Let's set our defaults if needed */
292          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
293          _INIT(rc->param.payback_method, DEFAULT_PAYBACK_METHOD);          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
         _INIT(rc->param.bitrate_payback_delay, DEFAULT_BITRATE_PAYBACK_DELAY);  
294          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
295          _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);          _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
296          _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);          _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
297          _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);          _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
298    
299          /* Keyframe settings */          /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
300          _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);          _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
301          _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
302  #undef _INIT  #undef _INIT
303    
304          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
305          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
306                  int j;                  int j;
307                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
308                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
309                            rc->quant_count[i][j] = 0;
310                    }
311          }          }
312    
313          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
314    
315          rc->fq_error = 0;          rc->fq_error = 0;
316    
317          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
318          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
319                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
320                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
321                  free(rc);                  free(rc);
322                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
323          }          }
324    
325          /* Allocate the stats' memory */          /* Allocate the stats' memory */
326          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
327                  free(rc);                  free(rc);
328                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
329          }          }
330    
331          /*          /* Allocate keyframes location's memory
332           * Allocate keyframes location's memory           * PS: see comment in pre_process0 for the +1 location requirement */
          * PS: see comment in pre_process0 for the +1 location requirement  
          */  
333          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
334          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
335                  free(rc->stats);                  free(rc->stats);
336                  free(rc);                  free(rc);
337                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
338          }          }
339    
340          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
341                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
342                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
343                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
344                  free(rc->stats);                  free(rc->stats);
345                  free(rc);                  free(rc);
# Line 245  Line 349 
349          /* Compute the target filesize */          /* Compute the target filesize */
350          if (rc->param.bitrate<0) {          if (rc->param.bitrate<0) {
351                  /* if negative, bitrate equals the target (in kbytes) */                  /* if negative, bitrate equals the target (in kbytes) */
352                  rc->target = (-rc->param.bitrate) * 1024;                  rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
353          } else if (rc->num_frames  < create->fbase/create->fincr) {          } else if (rc->num_frames  < create->fbase/create->fincr) {
354                  /* Source sequence is less than 1s long, we do as if it was 1s long */                  /* Source sequence is less than 1s long, we do as if it was 1s long */
355                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
# Line 257  Line 361 
361                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
362          }          }
363    
364          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
365                          create->fbase, create->fincr,                          create->fbase, create->fincr,
366                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
367          DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
368          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
369          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
370            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
371    
372          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
373          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
374          DPRINTF(XVID_DEBUG_RC, "Container Frame overhead: %d\n", rc->param.container_frame_overhead);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
375          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
376                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
377    
378          /*          /* Gathers some information about first pass stats:
          * First data pre processing:  
379           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
380           *     rc->min_size[]           *     rc->min_size[]
381           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 278  Line 383 
383           *  - count how many times each frame type has been used.           *  - count how many times each frame type has been used.
384           *     rc->count[]           *     rc->count[]
385           *  - total bytes used per frame type           *  - total bytes used per frame type
386           *     rc->total[]           *     rc->tot_length[]
387             *  - total bytes considered invariant between the 2 passes
388           *  - store keyframe location           *  - store keyframe location
389           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
390           */           */
391          pre_process0(rc);          first_pass_stats_prepare_data(rc);
392    
393          /*          /* When bitrate is not given it means it has been scaled by an external
394           * When bitrate is not given it means it has been scaled by an external           * application */
          * application  
          */  
395          if (rc->param.bitrate) {          if (rc->param.bitrate) {
396                  /* Apply zone settings */                  /* Apply zone settings
397                     * - set rc->tot_quant which represents the total num of bytes spent in
398                     *   fixed quant zones
399                     * - set rc->tot_quant_invariant which represents the total num of bytes spent
400                     *   in fixed quant zones for headers */
401                  zone_process(rc, create);                  zone_process(rc, create);
402                  /* Perform curve scaling */                  /* Perform internal curve scaling */
403                  internal_scale(rc);                  first_pass_scale_curve_internal(rc);
404          } else {          } else {
405                  /* External scaling -- zones are ignored */                  /* External scaling -- zones are ignored */
406                  for (i=0;i<rc->num_frames;i++) {                  for (i=0;i<rc->num_frames;i++) {
# Line 303  Line 411 
411                  rc->tot_quant = 0;                  rc->tot_quant = 0;
412          }          }
413    
414          pre_process1(rc);          /* Apply advanced curve options, and compute some parameters in order to
415             * shape the curve in the BEFORE/AFTER pair of functions */
416            scaled_curve_apply_advanced_parameters(rc);
417    
418          *handle = rc;          *handle = rc;
419          return(0);          return(0);
# Line 315  Line 425 
425  static int  static int
426  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
427  {  {
428            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
429                            rc->target,
430                            rc->desired_total,
431                            100*rc->desired_total/(double)rc->target,
432                            rc->real_total,
433                            100*rc->real_total/(double)rc->target);
434    
435          free(rc->keyframe_locations);          free(rc->keyframe_locations);
436          free(rc->stats);          free(rc->stats);
437          free(rc);          free(rc);
# Line 327  Line 444 
444  static int  static int
445  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
446  {  {
447          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
448          double dbytes;          double dbytes;
         double curve_temp;  
449          double scaled_quant;          double scaled_quant;
450            double overflow;
451          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
452    
453          /*          /* This function is quite long but easy to understand. In order to simplify
454           * This function is quite long but easy to understand. In order to simplify           * the code path (a bit), we treat 3 cases that can return immediatly. */
          * the code path (a bit), we treat 3 cases that can return immediatly.  
          */  
455    
456          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
457          if (data->quant > 0)          if (data->quant > 0)
458                  return(0);                  return(0);
459    
460          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data
461             * We can't guess much what we should do, let core decide all alone */
462            if (data->frame_num >= rc->num_frames) {
463                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
464                            data->frame_num);
465                    return(0);
466            }
467    
468            /* Third case: We are in a Quant zone
469             * Quant zones must just ensure we use the same settings as first pass
470             * So set the quantizer and the type */
471          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
472                    /* Quant stuff */
473                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
474                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
475                  rc->fq_error -= data->quant;                  rc->fq_error -= data->quant;
476    
477                    /* The type stuff */
478                    data->type = s->type;
479    
480                    /* The only required data for AFTER step is this one for the overflow
481                     * control */
482                  s->desired_length = s->length;                  s->desired_length = s->length;
483    
484                  return(0);                  return(0);
485          }          }
486    
         /* Third case: insufficent stats data */  
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
   
         /* XXX: why by 8 */  
         overflow = rc->overflow / 8;  
487    
488          /*          /*************************************************************************/
489           * The rc->overflow field represents the overflow in current scene (between two          /*************************************************************************/
490           * IFrames) so we must not forget to reset it if we are entering a new scene          /*************************************************************************/
          */  
         if (s->type == XVID_TYPE_IVOP)  
                 overflow = 0;  
   
         desired = s->scaled_length;  
   
         dbytes = desired;  
         if (s->type == XVID_TYPE_IVOP)  
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
   
         /*  
          * Apply user's choosen Payback method. Payback helps bitrate to follow the  
          * scaled curve "paying back" past errors in curve previsions.  
          */  
         if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
                 desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
         } else {  
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[s->type-1] / rc->param.bitrate_payback_delay);  
491    
492                  if (labs(desired) > fabs(rc->curve_comp_error))          /*-------------------------------------------------------------------------
493                          desired = (int)rc->curve_comp_error;           * Frame bit allocation first part
494          }           *
495             * First steps apply user settings, just like it is done in the theoritical
496          rc->curve_comp_error -= desired;           * scaled_curve_apply_advanced_parameters
497             *-----------------------------------------------------------------------*/
498    
499          /* XXX: warning */          /* Set desired to what we are wanting to obtain for this frame */
500          curve_temp = 0;          dbytes = (double)s->scaled_length;
501    
502          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {          /* IFrame user settings*/
503            if (s->type == XVID_TYPE_IVOP) {
504                    /* Keyframe boosting -- All keyframes benefit from it */
505                    dbytes += dbytes*rc->param.keyframe_boost / 100;
506    
507                  curve_temp = rc->curve_comp_scale;  #if 0 /* ToDo: decide how to apply kfthresholding */
508                  if (dbytes > rc->avg_length[s->type-1]) {  #endif
                         curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
509                  } else {                  } else {
                         curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
510    
511                  desired += (int)curve_temp;                  /* P/S/B frames must reserve some bits for iframe boosting */
512                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  dbytes *= rc->pb_iboost_tax_ratio;
         } else {  
                 desired += (int)dbytes;  
                 rc->curve_comp_error += dbytes - (int)dbytes;  
         }  
513    
514          /*                  /* Apply assymetric curve compression */
515           * We can't do bigger frames than first pass, this would be stupid as first                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
516           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose                          double assymetric_delta;
517           * many bytes and we would not not gain much quality.  
518           */                          /* Compute the assymetric delta, this is computed before applying
519          if (desired > s->length) {                           * the tax, as done in the pre_process function */
520                  rc->curve_comp_error += desired - s->length;                          if (dbytes > rc->avg_length[s->type-1])
521                  desired = s->length;                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
522          } else {                          else
523                  if (desired < rc->min_length[s->type-1]) {                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
524                          if (s->type == XVID_TYPE_IVOP){  
525                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;                          /* Now we must apply the assymetric tax, else our curve compression
526                             * would not give a theoritical target size equal to what it is
527                             * expected */
528                            dbytes *= rc->assymetric_tax_ratio;
529    
530                            /* Now we can add the assymetric delta */
531                            dbytes += assymetric_delta;
532                          }                          }
                         desired = rc->min_length[s->type-1];  
533                  }                  }
         }  
   
         s->desired_length = desired;  
   
         /*  
          * if this keyframe is too close to the next, reduce it's byte allotment  
          * XXX: why do we do this after setting the desired length ?  
          */  
   
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
534    
535                  if (KFdistance < rc->param.kftreshold) {          /* That is what we would like to have -- Don't put that chunk after
536             * overflow control, otherwise, overflow is counted twice and you obtain
537             * half sized bitrate sequences */
538            s->desired_length  = (int)dbytes;
539            rc->desired_total += dbytes;
540    
541                          KFdistance -= rc->param.min_key_interval;          /*------------------------------------------------------------------------
542             * Frame bit allocation: overflow control part.
543             *
544             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
545             * it's real encoding and we need to make sure we don't go so far from
546             * what is our ideal scaled curve.
547             *-----------------------------------------------------------------------*/
548    
549            /* Compute the overflow we should compensate */
550            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
551                    double frametype_factor;
552                    double framesize_factor;
553    
554                          if (KFdistance >= 0) {                  /* Take only the desired part of overflow */
555                                  int KF_min_size;                  overflow = rc->overflow;
556    
557                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                  /* Factor that will take care to decrease the overflow applied
558                                  if (KF_min_size < 1)                   * according to the importance of this frame type in term of
559                                          KF_min_size = 1;                   * overall size */
560                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
561                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
562                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
563                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
564                    frametype_factor  = 1/frametype_factor;
565    
566                    /* Factor that will take care not to compensate too much for this frame
567                     * size */
568                    framesize_factor  = dbytes;
569                    framesize_factor /= rc->avg_length[s->type-1];
570    
571                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  /* Treat only the overflow part concerned by this frame type and size */
572                                          (rc->param.kftreshold - rc->param.min_key_interval);                  overflow *= frametype_factor;
573    #if 0
574                    /* Leave this one alone, as it impacts badly on quality */
575                    overflow *= framesize_factor;
576    #endif
577    
578                                  if (desired < 1)                  /* Apply the overflow strength imposed by the user */
579                                          desired = 1;                  overflow *= (rc->param.overflow_control_strength/100.0f);
580                          }          } else {
581                  }                  /* no negative overflow applied in IFrames because:
582                     *  - their role is important as they're references for P/BFrames.
583                     *  - there aren't much in typical sequences, so if an IFrame overflows too
584                     *    much, this overflow may impact the next IFrame too much and generate
585                     *    a sequence of poor quality frames */
586                    overflow = 0;
587          }          }
588    
589          /*          /* Make sure we are not trying to compensate more overflow than we even have */
590           * The "sens commun" would force us to use rc->avg_length[s->type-1] but          if (fabs(overflow) > fabs(rc->overflow))
          * even VFW code uses the pframe average length. Note that this length is  
          * used with desired which represents bframes _and_ pframes length.  
          *  
          * XXX: why are we using the avg pframe length for all frame types ?  
          */  
         overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);  
   
         /* Reign in overflow with huge frames */  
         if (labs(overflow) > labs(rc->overflow))  
591                  overflow = rc->overflow;                  overflow = rc->overflow;
592    
593          /* Make sure overflow doesn't run away */          /* Make sure the overflow doesn't make the frame size to get out of the range
594          if (overflow > desired * rc->param.max_overflow_improvement / 100) {           * [-max_degradation..+max_improvment] */
595                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
596                          overflow * rc->param.max_overflow_improvement / 100;                  if(overflow <= dbytes)
597          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
598                  desired += desired * rc->param.max_overflow_degradation / -100;                  else
599                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
600            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
601                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
602          } else {          } else {
603                  desired += overflow;                  dbytes += overflow;
604          }          }
605    
606          /* Make sure we are not higher than desired frame size */          /*-------------------------------------------------------------------------
607          if (desired > rc->max_length) {           * Frame bit allocation last part:
608             *
609             * Cap frame length so we don't reach neither bigger frame sizes than first
610             * pass nor smaller than the allowed minimum.
611             *-----------------------------------------------------------------------*/
612    
613    #ifdef PASS_SMALLER
614            if (dbytes > s->length) {
615                    dbytes = s->length;
616            } else
617    #endif
618                    if (dbytes < rc->min_length[s->type-1]) {
619                    dbytes = rc->min_length[s->type-1];
620            } else if (dbytes > rc->max_length) {
621                    /* ToDo: this condition is always wrong as max_length == maximum frame
622                     * length of first pass, so the first condition already caps the frame
623                     * size... */
624                  capped_to_max_framesize = 1;                  capped_to_max_framesize = 1;
625                  desired = rc->max_length;                  dbytes = rc->max_length;
626                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
627                                  data->frame_num);                                  data->frame_num);
628          }          }
629    
630          /* Make sure to not scale below the minimum framesize */          /*------------------------------------------------------------------------
631          if (desired < rc->min_length[s->type-1]) {           * Desired frame length <-> quantizer mapping
632                  desired = rc->min_length[s->type-1];           *-----------------------------------------------------------------------*/
633                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
634                                  data->frame_num);  #ifdef BQUANT_PRESCALE
635            /* For bframes we prescale the quantizer to avoid too high quant scaling */
636            if(s->type == XVID_TYPE_BVOP) {
637    
638                    twopass_stat_t *b_ref = s;
639    
640                    /* Find the reference frame */
641                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
642                            b_ref--;
643    
644                    /* Compute the original quant */
645                    s->quant  = 2*(100*s->quant - data->bquant_offset);
646                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
647                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
648          }          }
649    #endif
650    
651          /*          /* Don't laugh at this very 'simple' quant<->size relationship, it
652           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * proves to be acurate enough for our algorithm */
653           * proves to be acurate enough for our algorithm          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
654           */  
655          scaled_quant = (double)s->quant*(double)s->length/(double)desired;  #ifdef COMPENSATE_FORMULA
656            /* We know xvidcore will apply the bframe formula again, so we compensate
657             * it right now to make sure we would not apply it twice */
658            if(s->type == XVID_TYPE_BVOP) {
659    
660                    twopass_stat_t *b_ref = s;
661    
662                    /* Find the reference frame */
663                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
664                            b_ref--;
665    
666                    /* Compute the quant it would be if the core did not apply the bframe
667                     * formula */
668                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
669                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
670                    scaled_quant /= data->bquant_ratio;
671            }
672    #endif
673    
674          /*          /* Quantizer has been scaled using floating point operations/results, we
675           * Quantizer has been scaled using floating point operations/results, we           * must cast it to integer */
          * must cast it to integer  
          */  
676          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
677    
678          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 513  Line 680 
680                  data->quant = 1;                  data->quant = 1;
681          } else if (data->quant > 31) {          } else if (data->quant > 31) {
682                  data->quant = 31;                  data->quant = 31;
683          } else if (s->type != XVID_TYPE_IVOP) {          } else {
684    
685                  /*                  /* The frame quantizer has not been clipped, this appears to be a good
                  * The frame quantizer has not been clipped, this appears to be a good  
686                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
687                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
688                   */                   * unit. */
689                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
690    
691                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
# Line 529  Line 695 
695                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
696                          data->quant--;                          data->quant--;
697                  }                  }
   
698          }          }
699    
700          /*          /* Now we have a computed quant that is in the right quante range, with a
          * Now we have a computed quant that is in the right quante range, with a  
701           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
702           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
703           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
704           * for future frames even if it this quantizer won't be really used atm,           * for future frames even if it this quantizer won't be really used atm,
705           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
706          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
707                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
708          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
709                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
710          }          }
711    
712          /*          /* To avoid big quality jumps from frame to frame, we apply a "security"
          * To avoid big quality jumps from frame to frame, we apply a "security"  
713           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
714           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
715          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
716    
717                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
718                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
719                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
720                                          "[%i] p/b-frame quantizer prevented from rising too steeply\n",                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
721                                          data->frame_num);                                          data->frame_num);
722                  }                  }
723                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
724                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
725                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
726                                          "[%i] p/b-frame quantizer prevented from falling too steeply\n",                                          "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
727                                          data->frame_num);                                          data->frame_num);
728                  }                  }
729          }          }
730    
731          /*          /* We don't want to pollute the RC histerisis when our computed quant has
732           * We don't want to pollute the RC history results when our computed quant           * been computed from a capped frame size */
          * has been computed from a capped frame size  
          */  
733          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
734                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
735    
736          /* Force frame type */          /* Don't forget to force 1st pass frame type ;-) */
737          data->type = s->type;          data->type = s->type;
738    
739          return 0;          return 0;
# Line 587  Line 746 
746  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
747  {  {
748          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
749          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
750    
751          /* Insufficent stats data */          /* Insufficent stats data */
752          if (data->frame_num >= rc->num_frames)          if (data->frame_num >= rc->num_frames)
753                  return 0;                  return 0;
754    
755          rc->quant_count[data->quant]++;          /* Update the quantizer counter */
756            rc->quant_count[s->type-1][data->quant]++;
757    
758            /* Update the frame type overflow */
759          if (data->type == XVID_TYPE_IVOP) {          if (data->type == XVID_TYPE_IVOP) {
760                  int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
761    
762                    if(rc->KF_idx != rc->num_frames -1) {
763                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
764                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
765                    }
766    
767                    /* Flush Keyframe overflow accumulator */
768                  rc->overflow += rc->KFoverflow;                  rc->overflow += rc->KFoverflow;
769    
770                    /* Store the frame overflow to the keyframe accumulator */
771                  rc->KFoverflow = s->desired_length - data->length;                  rc->KFoverflow = s->desired_length - data->length;
772    
773                  if (kfdiff > 1) {  /* non-consecutive keyframes */                  if (kfdiff > 1) {
774                            /* Non-consecutive keyframes case:
775                             * We can then divide this total keyframe overflow into equal parts
776                             * that we will distribute into regular overflow at each frame
777                             * between the sequence bounded by two IFrames */
778                          rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                          rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
779                  }else{ /* consecutive keyframes */                  } else {
780                            /* Consecutive keyframes case:
781                             * Flush immediatly the keyframe overflow and reset keyframe
782                             * overflow */
783                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
784                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
785                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
786                  }                  }
787                  rc->KF_idx++;                  rc->KF_idx++;
788          } else {          } else {
789                  /* distribute part of the keyframe overflow */                  /* Accumulate the frame overflow */
790                  rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
791    
792                    /* Distribute part of the keyframe overflow */
793                    rc->overflow += rc->KFoverflow_partial;
794    
795                    /* Don't forget to substract that same amount from the total keyframe
796                     * overflow */
797                  rc->KFoverflow -= rc->KFoverflow_partial;                  rc->KFoverflow -= rc->KFoverflow_partial;
798          }          }
799    
800          DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i desired:%d overflow:%i\n",          rc->overflow += (s->error = s->desired_length - data->length);
801            rc->real_total += data->length;
802    
803            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n",
804                          data->frame_num,                          data->frame_num,
805                          frame_type[data->type-1],                          frame_type[data->type-1],
806                          data->quant,                          data->quant,
807                          s->length,                          s->length,
808                          s->scaled_length,                          s->scaled_length,
                         data->length,  
809                          s->desired_length,                          s->desired_length,
810                            s->desired_length - s->error,
811                            -s->error,
812                          rc->overflow);                          rc->overflow);
813    
814          return(0);          return(0);
# Line 632  Line 818 
818   * Helper functions definition   * Helper functions definition
819   ****************************************************************************/   ****************************************************************************/
820    
821    /* Default buffer size for reading lines */
822  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
823    
824  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
825    static char *skipspaces(char *string);
826    static int iscomment(char *string);
827    static char *readline(FILE *f);
828    
829    /* This function counts the number of frame entries in the stats file
830     * It also counts the number of I Frames */
831  static int  static int
832  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
833  {  {
834          FILE * f;          FILE * f;
835          int n, ignore;          char *line;
836          char type;          int lines;
837    
838          rc->num_frames = 0;          rc->num_frames = 0;
839          rc->num_keyframes = 0;          rc->num_keyframes = 0;
840    
841          if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
842                  return 0;                  return(-1);
843    
844          while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
845                                            &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
846                  if (type == 'i') {  
847                          rc->num_frames++;                  char *ptr;
848                    char type;
849                    int fields;
850    
851                    lines++;
852    
853                    /* We skip spaces */
854                    ptr = skipspaces(line);
855    
856                    /* Skip coment lines or empty lines */
857                    if(iscomment(ptr) || *ptr == '\0') {
858                            free(line);
859                            continue;
860                    }
861    
862                    /* Read the stat line from buffer */
863                    fields = sscanf(ptr, "%c", &type);
864    
865                    /* Valid stats files have at least 7 fields */
866                    if (fields == 1) {
867                            switch(type) {
868                            case 'i':
869                            case 'I':
870                          rc->num_keyframes++;                          rc->num_keyframes++;
871                  }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
872                            case 'P':
873                            case 'b':
874                            case 'B':
875                            case 's':
876                            case 'S':
877                          rc->num_frames++;                          rc->num_frames++;
878                                    break;
879                            default:
880                                    DPRINTF(XVID_DEBUG_RC,
881                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
882                                                    lines, type);
883                            }
884                    } else {
885                                    DPRINTF(XVID_DEBUG_RC,
886                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
887                                                    lines, 7-fields);
888                  }                  }
889    
890                    /* Free the line buffer */
891                    free(line);
892          }          }
893    
894            /* We are done with the file */
895          fclose(f);          fclose(f);
896    
897          return 1;          return(0);
898  }  }
899    
900  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
901  static int  static int
902  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
903  {  {
904          FILE * f;          FILE * f;
905          int i, not_scaled;          int processed_entries;
906    
907            /* Opens the file */
908            if ((f = fopen(filename, "rb"))==NULL)
909                    return(-1);
910    
911          if ((f = fopen(filename, "rt"))==NULL)          processed_entries = 0;
912                  return 0;          while(processed_entries < rc->num_frames) {
   
         i = 0;  
         not_scaled = 0;  
         while(i < rc->num_frames) {  
                 stat_t * s = &rc->stats[i];  
                 int n;  
913                  char type;                  char type;
914                    int fields;
915                    twopass_stat_t * s = &rc->stats[processed_entries];
916                    char *line, *ptr;
917    
918                    /* Read the line from the file */
919                    if((line = readline(f)) == NULL)
920                            break;
921    
922                    /* We skip spaces */
923                    ptr = skipspaces(line);
924    
925                    /* Skip comment lines or empty lines */
926                    if(iscomment(ptr) || *ptr == '\0') {
927                            free(line);
928                            continue;
929                    }
930    
931                    /* Reset this field that is optional */
932                  s->scaled_length = 0;                  s->scaled_length = 0;
                 n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);  
                 if (n == EOF) break;  
                 if (n < 7) {  
                         not_scaled = 1;  
                 }  
933    
934                  if (type == 'i') {                  /* Convert the fields */
935                    fields = sscanf(ptr,
936                                                    "%c %d %d %d %d %d %d %d\n",
937                                                    &type,
938                                                    &s->quant,
939                                                    &s->blks[0], &s->blks[1], &s->blks[2],
940                                                    &s->length, &s->invariant /* not really yet */,
941                                                    &s->scaled_length);
942    
943                    /* Free line buffer, we don't need it anymore */
944                    free(line);
945    
946                    /* Fail silently, this has probably been warned in
947                     * statsfile_count_frames */
948                    if(fields != 7 && fields != 8)
949                            continue;
950    
951                    /* Convert frame type and compute the invariant length part */
952                    switch(type) {
953                    case 'i':
954                    case 'I':
955                          s->type = XVID_TYPE_IVOP;                          s->type = XVID_TYPE_IVOP;
956                  }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
957                            break;
958                    case 'p':
959                    case 'P':
960                    case 's':
961                    case 'S':
962                          s->type = XVID_TYPE_PVOP;                          s->type = XVID_TYPE_PVOP;
963                  }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
964                            break;
965                    case 'b':
966                    case 'B':
967                          s->type = XVID_TYPE_BVOP;                          s->type = XVID_TYPE_BVOP;
968                  }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
969                          DPRINTF(XVID_DEBUG_RC, "WARNING: unknown stats frame type, assuming pvop\n");                          break;
970                          s->type = XVID_TYPE_PVOP;                  default:
971                            /* Same as before, fail silently */
972                            continue;
973                  }                  }
974    
975                  i++;                  /* Ok it seems it's been processed correctly */
976                    processed_entries++;
977          }          }
978    
979          rc->num_frames = i;          /* Close the file */
   
980          fclose(f);          fclose(f);
981    
982          return 1;          return(0);
 }  
   
 #if 0  
 static void print_stats(rc_2pass2_t * rc)  
 {  
         int i;  
         DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");  
         for (i = 0; i < rc->num_frames; i++) {  
                 stat_t * s = &rc->stats[i];  
                 DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);  
         }  
983  }  }
 #endif  
984    
985  /* pre-process the statistics data  /* pre-process the statistics data
986     - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
987     - set keyframes_locations   * - set keyframes_locations */
 */  
   
988  static void  static void
989  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
990  {  {
991          int i,j;          int i,j;
992    
993          /*          /* *rc fields initialization
          * *rc fields initialization  
994           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
995           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
996          for (i=0; i<3; i++) {          for (i=0; i<3; i++) {
997                  rc->count[i]=0;                  rc->count[i]=0;
998                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
999                    rc->tot_invariant[i] = 0;
1000                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
1001          }          }
1002    
1003          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
1004    
1005          /*          /* Loop through all frames and find/compute all the stuff this function
1006           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
1007          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
1008                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1009    
1010                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
1011                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
1012                    rc->tot_invariant[s->type-1] += s->invariant;
1013    
1014                  if (s->length < rc->min_length[s->type-1]) {                  if (s->length < rc->min_length[s->type-1]) {
1015                          rc->min_length[s->type-1] = s->length;                          rc->min_length[s->type-1] = s->length;
# Line 770  Line 1025 
1025                  }                  }
1026          }          }
1027    
1028          /*          /* NB:
          * Nota Bene:  
1029           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1030           * formed by all frames between two iframes, so if we want to make sure           * formed by all frames between two iframes, so if we want to make sure
1031           * the system does not go nuts during last sequence, we force the last           * the system does not go nuts during last sequence, we force the last
1032           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1033          rc->keyframe_locations[j] = i;          rc->keyframe_locations[j] = i;
1034    
1035          DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1036          DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1037          DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1038  }  }
1039    
1040  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1041  static void  static void
1042  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1043  {  {
# Line 794  Line 1046 
1046    
1047          rc->avg_weight = 0.0;          rc->avg_weight = 0.0;
1048          rc->tot_quant = 0;          rc->tot_quant = 0;
1049            rc->tot_quant_invariant = 0;
1050    
1051          if (create->num_zones == 0) {          if (create->num_zones == 0) {
1052                  for (j = 0; j < rc->num_frames; j++) {                  for (j = 0; j < rc->num_frames; j++) {
# Line 832  Line 1084 
1084                                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1085                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1086                                  rc->tot_quant += rc->stats[j].length;                                  rc->tot_quant += rc->stats[j].length;
1087                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1088                          }                          }
1089                  }                  }
1090          }          }
1091          rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;          rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1092    
1093          DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames)  fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant);
1094  }  }
1095    
1096    
1097  /* scale the curve */  /* scale the curve */
   
1098  static void  static void
1099  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1100  {  {
1101          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1102          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t pass1_length;
1103            int64_t total_invariant;
1104          double scaler;          double scaler;
1105          int i, num_MBs;          int i, num_MBs;
1106    
1107            /* We only scale texture data ! */
1108            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1109            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1110            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1111            /* don't forget to substract header bytes used in quant zones, otherwise we
1112             * counting them twice */
1113            total_invariant -= rc->tot_quant_invariant;
1114    
1115            /* We remove the bytes used by the fixed quantizer zones during first pass
1116             * with the same quants, so we know very precisely how much that
1117             * represents */
1118            target  = rc->target;
1119            target -= rc->tot_quant;
1120    
1121            /* Do the same for the first pass data */
1122            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1123            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1124            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1125            pass1_length -= rc->tot_quant;
1126    
1127          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1128          scaler = (double)target / (double)pass1_length;          scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1129    
1130          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  #ifdef PASS_SMALLER
1131                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");          if ((target - total_invariant) <= 0 ||
1132                    (pass1_length - total_invariant) <= 0 ||
1133                    target >= pass1_length) {
1134                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1135                  scaler = 1.0;                  scaler = 1.0;
1136          }          }
1137    #endif
1138    
1139          DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1140                          "Before correction: target=%i, tot_length=%i, scaler=%f\n",           * of MBs. We sum all block type counters of frame 0, this gives us the
1141                          (int)target, (int)pass1_length, scaler);           * number of MBs.
   
         /*  
          * Compute min frame lengths (for each frame type) according to the number  
          * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so  
          * blocks[0] should be enough) to know how many MBs there are.  
1142           *           *
1143           * We compare these hardcoded values with observed values in first pass           * We compare these hardcoded values with observed values in first pass
1144           * (determined in pre_process0).Then we keep the real minimum.           * (determined in pre_process0).Then we keep the real minimum. */
          */  
         num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];  
   
         if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)  
                 rc->min_length[0] = ((num_MBs*22) + 240) / 8;  
1145    
1146          if(rc->min_length[1] > ((num_MBs) + 88)  / 8)          /* Number of MBs */
1147                  rc->min_length[1] = ((num_MBs) + 88)  / 8;          num_MBs  = rc->stats[0].blks[0];
1148            num_MBs += rc->stats[0].blks[1];
1149            num_MBs += rc->stats[0].blks[2];
1150    
1151            /* Minimum for I frames */
1152            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1153                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1154    
1155            /* Minimum for P/S frames */
1156            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1157                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1158    
1159            /* Minimum for B frames */
1160            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1161                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1162    
1163          if(rc->min_length[2] > 8)          /* Perform an initial scale pass.
1164                  rc->min_length[2] = 8;           *
   
         /*  
          * Perform an initial scale pass.  
1165           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1166           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1167           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1168          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1169                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1170                  int len;                  int len;
1171    
1172                    /* No need to scale frame length for which a specific quantizer is
1173                     * specified thanks to zones */
1174                  if (s->zone_mode == XVID_ZONE_QUANT) {                  if (s->zone_mode == XVID_ZONE_QUANT) {
1175                          s->scaled_length = s->length;                          s->scaled_length = s->length;
1176                          continue;                          continue;
1177                  }                  }
1178    
1179                  /* Compute the scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1180                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
1181    
1182                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1183                  if (len < rc->min_length[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1184                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1185                             * computed minimum */
1186                          s->scaled_length = rc->min_length[s->type-1];                          s->scaled_length = rc->min_length[s->type-1];
1187    
1188                            /* Remove both scaled and original size from their respective
1189                             * total counters, as we prepare a second pass for 'regular'
1190                             * frames */
1191                          target -= s->scaled_length;                          target -= s->scaled_length;
1192                          pass1_length -= s->length;                          pass1_length -= s->length;
1193                  } else {                  } else {
# Line 912  Line 1196 
1196                  }                  }
1197          }          }
1198    
1199          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1200          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1201    
1202            /* Scaling factor for 'regular' frames */
1203            scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1204    
1205    #ifdef PASS_SMALLER
1206          /* Detect undersizing */          /* Detect undersizing */
1207          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1208                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1209                  scaler = 1.0;                  scaler = 1.0;
1210          }          }
1211    #endif
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
1212    
1213          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1214          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1215                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1216    
1217                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1218                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1219                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
1220          }          }
1221    
1222            /* Job done */
1223            return;
1224  }  }
1225    
1226    /* Apply all user settings to the scaled curve
1227     * This implies:
1228     *   keyframe boosting
1229     *   high/low compression */
1230  static void  static void
1231  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1232  {  {
1233          int i;          int i;
1234          double total1, total2;          int64_t ivop_boost_total;
         uint64_t ivop_boost_total;  
1235    
1236          ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1237          rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1238    
1239          for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1240                  rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1241                    twopass_stat_t *s = &rc->stats[i];
1242                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1243          }          }
1244    
1245            /* First we compute the total amount of bits needed, as being described by
1246             * the scaled distribution. During this pass over the complete stats data,
1247             * we see how much bits two user settings will get/give from/to p&b frames:
1248             *  - keyframe boosting
1249             *  - keyframe distance penalty */
1250            rc->KF_idx = 0;
1251            ivop_boost_total = 0;
1252          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1253                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
                 rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1254    
1255                    /* Some more work is needed for I frames */
1256                  if (s->type == XVID_TYPE_IVOP) {                  if (s->type == XVID_TYPE_IVOP) {
1257                          ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1258    
1259                            /* Accumulate bytes needed for keyframe boosting */
1260                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1261    
1262    #if 0 /* ToDo: decide how to apply kfthresholding */
1263    #endif
1264                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1265                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1266                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1267    
1268                            /* Accumulate the ivop boost */
1269                            ivop_boost_total += ivop_boost;
1270    
1271                            /* Don't forget to update the keyframe index */
1272                            rc->KF_idx++;
1273                  }                  }
1274          }          }
1275    
1276          rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          /* Initialize the IBoost tax ratio for P/S/B frames
1277                                             (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1278             * This ratio has to be applied to p/b/s frames in order to reserve
1279             * additional bits for keyframes (keyframe boosting) or if too much
1280             * keyframe distance is applied, bits retrieved from the keyframes.
1281             *
1282             * ie pb_length *= rc->pb_iboost_tax_ratio;
1283             *
1284             *    gives the ideal length of a p/b frame */
1285    
1286            /* Compute the total length of p/b/s frames (temporary storage into
1287             * movie_curve) */
1288            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1289            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1290    
1291            /* Compute the ratio described above
1292             *     taxed_total = sum(0, n, tax*scaled_length)
1293             * <=> taxed_total = tax.sum(0, n, scaled_length)
1294             * <=> tax = taxed_total / original_total */
1295            rc->pb_iboost_tax_ratio =
1296                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1297                    rc->pb_iboost_tax_ratio;
1298    
1299            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1300                            rc->pb_iboost_tax_ratio);
1301    
1302            /* Compute the average size of frames per frame type */
1303          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
1304                  if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1305                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1306                          rc->avg_length[i] = 1;                          rc->avg_length[i] = 1;
1307                  }else{                  }else{
1308                          rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1309                  }  
1310                            if (i == (XVID_TYPE_IVOP-1)) {
1311                                    /* I Frames total has to be added the boost total */
1312                                    rc->avg_length[i] += ivop_boost_total;
1313                            } else {
1314                                    /* P/B frames has to taxed */
1315                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1316          }          }
1317    
1318  /* --- */                          /* Finally compute the average frame size */
1319                            rc->avg_length[i] /= (double)rc->count[i];
1320                    }
1321            }
1322    
1323          total1=total2=0;          /* Assymetric curve compression */
1324            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1325                    double symetric_total;
1326                    double assymetric_delta_total;
1327    
1328                    /* Like I frame boosting, assymetric curve compression modifies the total
1329                     * amount of needed bits, we must compute the ratio so we can prescale
1330                     lengths */
1331                    symetric_total = 0;
1332                    assymetric_delta_total = 0;
1333          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1334                  stat_t * s = &rc->stats[i];                          double assymetric_delta;
1335                            double dbytes;
1336                            twopass_stat_t * s = &rc->stats[i];
1337    
1338                  if (s->type != XVID_TYPE_IVOP) {                          /* I Frames are not concerned by assymetric scaling */
1339                          double dbytes,dbytes2;                          if (s->type == XVID_TYPE_IVOP)
1340                                    continue;
1341    
1342                          dbytes = s->scaled_length / rc->movie_curve;                          /* During the real run, we would have to apply the iboost tax */
1343                          dbytes2 = 0; /* XXX: warning */                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                         total1 += dbytes;  
1344    
1345                          if (dbytes > rc->avg_length[s->type-1]) {                          /* Update the symmetric curve compression total */
1346                                  dbytes2=((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          symetric_total += dbytes;
1347    
1348                            /* Apply assymetric curve compression */
1349                            if (dbytes > rc->avg_length[s->type-1])
1350                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1351                            else
1352                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1353    
1354                            /* Cap to the minimum frame size if needed */
1355                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1356                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1357    
1358                            /* Accumulate after assymetric curve compression */
1359                            assymetric_delta_total += assymetric_delta;
1360                    }
1361    
1362                    /* Compute the tax that all p/b frames have to pay in order to respect the
1363                     * bit distribution changes that the assymetric compression curve imposes
1364                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1365                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1366                     *         ratio = assymetric_total / symmetric_total */
1367                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1368                          } else {                          } else {
1369                                  dbytes2 = ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1370                          }                          }
1371    
1372                          if (dbytes2 < rc->min_length[s->type-1])          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
                                 dbytes2 = rc->min_length[s->type-1];  
1373    
1374                          total2 += dbytes2;          /* Last bits that need to be reset */
1375            rc->overflow = 0;
1376            rc->KFoverflow = 0;
1377            rc->KFoverflow_partial = 0;
1378            rc->KF_idx = 0;
1379            rc->desired_total = 0;
1380            rc->real_total = 0;
1381    
1382            /* Job done */
1383            return;
1384                  }                  }
1385    
1386    /*****************************************************************************
1387     * Still more low level stuff (nothing to do with stats treatment)
1388     ****************************************************************************/
1389    
1390    /* This function returns an allocated string containing a complete line read
1391     * from the file starting at the current position */
1392    static char *
1393    readline(FILE *f)
1394    {
1395            char *buffer = NULL;
1396            int buffer_size = 0;
1397            int pos = 0;
1398    
1399            do {
1400                    int c;
1401    
1402                    /* Read a character from the stream */
1403                    c = fgetc(f);
1404    
1405                    /* Is that EOF or new line ? */
1406                    if(c == EOF || c == '\n')
1407                            break;
1408    
1409                    /* Do we have to update buffer ? */
1410                    if(pos >= buffer_size - 1) {
1411                            buffer_size += BUF_SZ;
1412                            buffer = (char*)realloc(buffer, buffer_size);
1413                            if (buffer == NULL)
1414                                    return(NULL);
1415          }          }
1416    
1417          rc->curve_comp_scale = total1 / total2;                  buffer[pos] = c;
1418                    pos++;
1419            } while(1);
1420    
1421          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: pframe%d bframe:%d\n",          /* Read \n or EOF */
1422                          (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale),          if (buffer == NULL) {
1423                          (int)(rc->avg_length[XVID_TYPE_BVOP-1] * rc->curve_comp_scale));                  /* EOF, so we reached the end of the file, return NULL */
1424                    if(feof(f))
1425                            return(NULL);
1426    
1427          rc->overflow = 0;                  /* Just an empty line with just a newline, allocate a 1 byte buffer to
1428          rc->KFoverflow = 0;                   * store a zero length string */
1429          rc->KFoverflow_partial = 0;                  buffer = (char*)malloc(1);
1430          rc->KF_idx = 1;                  if(buffer == NULL)
1431                            return(NULL);
1432  }  }
1433    
1434            /* Zero terminated string */
1435            buffer[pos] = '\0';
1436    
1437            return(buffer);
1438    }
1439    
1440    /* This function returns a pointer to the first non space char in the given
1441     * string */
1442    static char *
1443    skipspaces(char *string)
1444    {
1445            const char spaces[] =
1446                    {
1447                            ' ','\t','\0'
1448                    };
1449            const char *spacechar = spaces;
1450    
1451            if (string == NULL) return(NULL);
1452    
1453            while (*string != '\0') {
1454                    /* Test against space chars */
1455                    while (*spacechar != '\0') {
1456                            if (*string == *spacechar) {
1457                                    string++;
1458                                    spacechar = spaces;
1459                                    break;
1460                            }
1461                            spacechar++;
1462                    }
1463    
1464                    /* No space char */
1465                    if (*spacechar == '\0') return(string);
1466            }
1467    
1468            return(string);
1469    }
1470    
1471    /* This function returns a boolean that tells if the string is only a
1472     * comment */
1473    static int
1474    iscomment(char *string)
1475    {
1476            const char comments[] =
1477                    {
1478                            '#',';', '%', '\0'
1479                    };
1480            const char *cmtchar = comments;
1481            int iscomment = 0;
1482    
1483            if (string == NULL) return(1);
1484    
1485            string = skipspaces(string);
1486    
1487            while(*cmtchar != '\0') {
1488                    if(*string == *cmtchar) {
1489                            iscomment = 1;
1490                            break;
1491                    }
1492                    cmtchar++;
1493            }
1494    
1495            return(iscomment);
1496    }
1497    
1498    #if 0
1499    static void
1500    stats_print(rc_2pass2_t * rc)
1501    {
1502            int i;
1503            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1504    
1505            for (i=0; i<rc->num_frames; i++) {
1506                    twopass_stat_t *s = &rc->stats[i];
1507                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1508                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1509                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1510            }
1511    }
1512    #endif
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