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revision 1161, Wed Oct 1 23:23:01 2003 UTC revision 1267, Wed Dec 17 15:16:16 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 1.1.2.31 2003-12-17 15:16:16 edgomez Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35  #include <stdio.h>  #include <stdio.h>
36  #include <math.h>  #include <math.h>
37  #include <limits.h>  #include <limits.h>
# Line 37  Line 40 
40  #include "../image/image.h"  #include "../image/image.h"
41    
42  /*****************************************************************************  /*****************************************************************************
43   * Some constants   * Some default settings
44   ****************************************************************************/   ****************************************************************************/
45    
46  #define DEFAULT_KEYFRAME_BOOST 0  #define DEFAULT_KEYFRAME_BOOST 0
47  #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP  #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
 #define DEFAULT_BITRATE_PAYBACK_DELAY 250  
48  #define DEFAULT_CURVE_COMPRESSION_HIGH 0  #define DEFAULT_CURVE_COMPRESSION_HIGH 0
49  #define DEFAULT_CURVE_COMPRESSION_LOW 0  #define DEFAULT_CURVE_COMPRESSION_LOW 0
50  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
51  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
52    
53  /* Keyframe settings */  /* Keyframe settings */
 #define DEFAULT_KFTRESHOLD 10  
54  #define DEFAULT_KFREDUCTION 20  #define DEFAULT_KFREDUCTION 20
55  #define DEFAULT_MIN_KEY_INTERVAL 1  #define DEFAULT_KFTHRESHOLD 1
56    
57    /*****************************************************************************
58     * Some default constants (can be tuned)
59     ****************************************************************************/
60    
61    /* Specify the invariant part of the headers bits (header+MV)
62     * as  hlength/cst */
63    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
64    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
65    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
66    
67  /*****************************************************************************  /*****************************************************************************
68   * Structures   * Structures
# Line 63  Line 74 
74          int quant;              /* first pass quant */          int quant;              /* first pass quant */
75          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
76          int length;             /* first pass length */          int length;             /* first pass length */
77            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
78          int scaled_length;      /* scaled length */          int scaled_length;      /* scaled length */
79          int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
80            int error;
81    
82          int zone_mode;   /* XVID_ZONE_xxx */          int zone_mode;   /* XVID_ZONE_xxx */
83          double weight;          double weight;
84  } stat_t;  } twopass_stat_t;
85    
86  /* Context struct */  /* Context struct */
87  typedef struct  typedef struct
88  {  {
89          xvid_plugin_2pass2_t param;          xvid_plugin_2pass2_t param;
90    
91          /* constant statistical data */          /*----------------------------------
92             * constant statistical data
93             *--------------------------------*/
94    
95            /* Number of frames of the sequence */
96          int num_frames;          int num_frames;
         int num_keyframes;  
         uint64_t target;        /* target filesize */  
97    
98          int count[3];   /* count of each frame types */          /* Number of Intra frames of the sequence */
99          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 */  
100    
101          /* zone statistical data */          /* Target filesize to reach */
102          double avg_weight;  /* average weight */          uint64_t target;
         int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
103    
104            /* Count of each frame types */
105            int count[3];
106    
107          double curve_comp_scale;          /* Total length of each frame types (1st pass) */
108          double movie_curve;          uint64_t tot_length[3];
109            uint64_t tot_invariant[3];
110    
111            /* Average length of each frame types (used first for 1st pass data and
112             * then for scaled averages */
113            double avg_length[3];
114    
115            /* Minimum frame length allowed for each frame type */
116            int min_length[3];
117    
118            /* Total bytes per frame type once the curve has been scaled
119             * NB: advanced parameters do not change this value. This field
120             *     represents the total scaled w/o any advanced settings */
121            uint64_t tot_scaled_length[3];
122    
123            /* Maximum observed frame size observed during the first pass, the RC
124             * will try tp force all frame sizes in the second pass to be under that
125             * limit */
126            int max_length;
127    
128          /* dynamic */          /*----------------------------------
129             * Zones statistical data
130             *
131             * ToDo: Fix zones, current
132             *       implementation is buggy
133             *--------------------------------*/
134    
135            /* Average weight of the zones */
136            double avg_weight;
137    
138            /* Total length used by XVID_ZONE_QUANT zones */
139            uint64_t tot_quant;
140            uint64_t tot_quant_invariant;
141    
142            /*----------------------------------
143             * Advanced settings helper ratios
144             *--------------------------------*/
145    
146            /* This the ratio that has to be applied to all p/b frames in order
147             * to reserve/retrieve bits for/from keyframe boosting and consecutive
148             * keyframe penalty */
149            double pb_iboost_tax_ratio;
150    
151            /* This the ratio to apply to all b/p frames in order to respect the
152             * assymetric curve compression while respecting a target filesize
153             * NB: The assymetric delta gain has to be computed before this ratio
154             *     is applied, and then the delta is added to the scaled size */
155            double assymetric_tax_ratio;
156    
157            /*----------------------------------
158             * Data from the stats file kept
159             * into RAM for easy access
160             *--------------------------------*/
161    
162            /* Array of keyframe locations
163             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
164             *     keyframe */
165          int * keyframe_locations;          int * keyframe_locations;
         stat_t * stats;  
166    
167            /* Index of the last keyframe used in the keyframe_location */
168            int KF_idx;
169    
170            /* Array of all 1st pass data file -- see the twopass_stat_t structure
171             * definition for more details */
172            twopass_stat_t * stats;
173    
174            /*----------------------------------
175             * Histerysis helpers
176             *--------------------------------*/
177    
178            /* This field holds the int2float conversion errors of each quant per
179             * frame type, this allow the RC to keep track of rouding error and thus
180             * increase or decrease the chosen quant according to this residue */
181          double quant_error[3][32];          double quant_error[3][32];
182          int quant_count[32];  
183            /* This fields stores the count of each quant usage per frame type
184             * No real role but for debugging */
185            int quant_count[3][32];
186    
187            /* Last valid quantizer used per frame type, it allows quantizer
188             * increament/decreament limitation in order to avoid big image quality
189             * "jumps" */
190          int last_quant[3];          int last_quant[3];
191    
192          double curve_comp_error;          /*----------------------------------
193          int overflow;           * Overflow control
194          int KFoverflow;           *--------------------------------*/
195          int KFoverflow_partial;  
196          int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
197            double overflow;
198    
199            /* Total overflow for keyframes -- not distributed directly */
200            double KFoverflow;
201    
202            /* Amount of keyframe overflow to introduce to the global p/b frame
203             * overflow counter at each encoded frame */
204            double KFoverflow_partial;
205    
206            /* Unknown ???
207             * ToDo: description */
208          double fq_error;          double fq_error;
209    
210            /*----------------------------------
211             * Debug
212             *--------------------------------*/
213            double desired_total;
214            double real_total;
215  } rc_2pass2_t;  } rc_2pass2_t;
216    
217    
# Line 131  Line 233 
233  {  {
234          switch(opt) {          switch(opt) {
235          case XVID_PLG_INFO :          case XVID_PLG_INFO :
236            case XVID_PLG_FRAME :
237                  return 0;                  return 0;
238    
239          case XVID_PLG_CREATE :          case XVID_PLG_CREATE :
# Line 154  Line 257 
257   ****************************************************************************/   ****************************************************************************/
258    
259  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
260  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
261  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
262  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);
263  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
264  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
265  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
266    #if 0
267    static void stats_print(rc_2pass2_t * rc);
268    #endif
269    
270  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
271   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 177  Line 283 
283    
284          rc->param = *param;          rc->param = *param;
285    
286          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
287  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
288          /* Let's set our defaults if needed */          /* Let's set our defaults if needed */
289          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
290          _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);  
291          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
292          _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);          _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
293          _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);          _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
294          _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);          _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
295    
296          /* Keyframe settings */          /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
297          _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);          _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
298          _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
299  #undef _INIT  #undef _INIT
300    
301          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
302          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
303                  int j;                  int j;
304                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
305                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
306                            rc->quant_count[i][j] = 0;
307                    }
308          }          }
309    
310          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
311    
312          rc->fq_error = 0;          rc->fq_error = 0;
313    
314          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
315          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
316                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
317                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
318                  free(rc);                  free(rc);
319                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
320          }          }
321    
322          /* Allocate the stats' memory */          /* Allocate the stats' memory */
323          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
324                  free(rc);                  free(rc);
325                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
326          }          }
327    
328          /*          /* Allocate keyframes location's memory
329           * 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  
          */  
330          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
331          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
332                  free(rc->stats);                  free(rc->stats);
333                  free(rc);                  free(rc);
334                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
335          }          }
336    
337          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
338                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
339                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
340                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
341                  free(rc->stats);                  free(rc->stats);
342                  free(rc);                  free(rc);
# Line 245  Line 346 
346          /* Compute the target filesize */          /* Compute the target filesize */
347          if (rc->param.bitrate<0) {          if (rc->param.bitrate<0) {
348                  /* if negative, bitrate equals the target (in kbytes) */                  /* if negative, bitrate equals the target (in kbytes) */
349                  rc->target = (-rc->param.bitrate) * 1024;                  rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
350          } else if (rc->num_frames  < create->fbase/create->fincr) {          } else if (rc->num_frames  < create->fbase/create->fincr) {
351                  /* 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 */
352                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
# Line 257  Line 358 
358                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
359          }          }
360    
361          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
362                          create->fbase, create->fincr,                          create->fbase, create->fincr,
363                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
364          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);
365          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
366          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
367            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
368    
369          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
370          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
371          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);
372          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
373                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
374    
375          /*          /* Gathers some information about first pass stats:
          * First data pre processing:  
376           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
377           *     rc->min_size[]           *     rc->min_size[]
378           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 278  Line 380 
380           *  - count how many times each frame type has been used.           *  - count how many times each frame type has been used.
381           *     rc->count[]           *     rc->count[]
382           *  - total bytes used per frame type           *  - total bytes used per frame type
383           *     rc->total[]           *     rc->tot_length[]
384             *  - total bytes considered invariant between the 2 passes
385           *  - store keyframe location           *  - store keyframe location
386           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
387           */           */
388          pre_process0(rc);          first_pass_stats_prepare_data(rc);
389    
390          /*          /* When bitrate is not given it means it has been scaled by an external
391           * When bitrate is not given it means it has been scaled by an external           * application */
          * application  
          */  
392          if (rc->param.bitrate) {          if (rc->param.bitrate) {
393                  /* Apply zone settings */                  /* Apply zone settings
394                     * - set rc->tot_quant which represents the total num of bytes spent in
395                     *   fixed quant zones
396                     * - set rc->tot_quant_invariant which represents the total num of bytes spent
397                     *   in fixed quant zones for headers */
398                  zone_process(rc, create);                  zone_process(rc, create);
399                  /* Perform curve scaling */                  /* Perform internal curve scaling */
400                  internal_scale(rc);                  first_pass_scale_curve_internal(rc);
401          } else {          } else {
402                  /* External scaling -- zones are ignored */                  /* External scaling -- zones are ignored */
403                  for (i=0;i<rc->num_frames;i++) {                  for (i=0;i<rc->num_frames;i++) {
# Line 303  Line 408 
408                  rc->tot_quant = 0;                  rc->tot_quant = 0;
409          }          }
410    
411          pre_process1(rc);          /* Apply advanced curve options, and compute some parameters in order to
412             * shape the curve in the BEFORE/AFTER pair of functions */
413            scaled_curve_apply_advanced_parameters(rc);
414    
415          *handle = rc;          *handle = rc;
416          return(0);          return(0);
# Line 315  Line 422 
422  static int  static int
423  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
424  {  {
425            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
426                            rc->target,
427                            rc->desired_total,
428                            100*rc->desired_total/(double)rc->target,
429                            rc->real_total,
430                            100*rc->real_total/(double)rc->target);
431    
432          free(rc->keyframe_locations);          free(rc->keyframe_locations);
433          free(rc->stats);          free(rc->stats);
434          free(rc);          free(rc);
# Line 327  Line 441 
441  static int  static int
442  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
443  {  {
444          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
445          double dbytes;          double dbytes;
         double curve_temp;  
446          double scaled_quant;          double scaled_quant;
447            double overflow;
448          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
449    
450          /*          /* This function is quite long but easy to understand. In order to simplify
451           * 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.  
          */  
452    
453          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
454          if (data->quant > 0)          if (data->quant > 0)
455                  return(0);                  return(0);
456    
457          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data */
458            if (data->frame_num >= rc->num_frames) {
459                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
460                            data->frame_num);
461                    return(0);
462            }
463    
464            /* Third case: We are in a Quant zone */
465          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
466                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
467                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
# Line 355  Line 472 
472                  return(0);                  return(0);
473          }          }
474    
         /* Third case: insufficent stats data */  
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
   
         /* XXX: why by 8 */  
         overflow = rc->overflow / 8;  
   
         /*  
          * The rc->overflow field represents the overflow in current scene (between two  
          * IFrames) so we must not forget to reset it if we are entering a new scene  
          */  
         if (s->type == XVID_TYPE_IVOP)  
                 overflow = 0;  
475    
476          desired = s->scaled_length;          /*************************************************************************/
477            /*************************************************************************/
478          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);  
   
                 if (labs(desired) > fabs(rc->curve_comp_error))  
                         desired = (int)rc->curve_comp_error;  
         }  
479    
480          rc->curve_comp_error -= desired;          /*-------------------------------------------------------------------------
481             * Frame bit allocation first part
482             *
483             * First steps apply user settings, just like it is done in the theoritical
484             * scaled_curve_apply_advanced_parameters
485             *-----------------------------------------------------------------------*/
486    
487          /* XXX: warning */          /* Set desired to what we are wanting to obtain for this frame */
488          curve_temp = 0;          dbytes = (double)s->scaled_length;
489    
490          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {          /* IFrame user settings*/
491            if (s->type == XVID_TYPE_IVOP) {
492                    /* Keyframe boosting -- All keyframes benefit from it */
493                    dbytes += dbytes*rc->param.keyframe_boost / 100;
494    
495                  curve_temp = rc->curve_comp_scale;  #if 0 /* ToDo: decide how to apply kfthresholding */
496                  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);  
497                  } else {                  } else {
                         curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
498    
499                  desired += (int)curve_temp;                  /* P/S/B frames must reserve some bits for iframe boosting */
500                  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;  
         }  
501    
502          /*                  /* Apply assymetric curve compression */
503           * 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) {
504           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose                          double assymetric_delta;
505           * many bytes and we would not not gain much quality.  
506           */                          /* Compute the assymetric delta, this is computed before applying
507          if (desired > s->length) {                           * the tax, as done in the pre_process function */
508                  rc->curve_comp_error += desired - s->length;                          if (dbytes > rc->avg_length[s->type-1])
509                  desired = s->length;                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
510          } else {                          else
511                  if (desired < rc->min_length[s->type-1]) {                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
512                          if (s->type == XVID_TYPE_IVOP){  
513                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;                          /* Now we must apply the assymetric tax, else our curve compression
514                             * would not give a theoritical target size equal to what it is
515                             * expected */
516                            dbytes *= rc->assymetric_tax_ratio;
517    
518                            /* Now we can add the assymetric delta */
519                            dbytes += assymetric_delta;
520                          }                          }
                         desired = rc->min_length[s->type-1];  
521                  }                  }
         }  
   
         s->desired_length = desired;  
522    
523          /*          /* That is what we would like to have -- Don't put that chunk after
524           * if this keyframe is too close to the next, reduce it's byte allotment           * overflow control, otherwise, overflow is counted twice and you obtain
525           * XXX: why do we do this after setting the desired length ?           * half sized bitrate sequences */
526           */          s->desired_length  = (int)dbytes;
527            rc->desired_total += dbytes;
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
528    
529                  if (KFdistance < rc->param.kftreshold) {          /*------------------------------------------------------------------------
530             * Frame bit allocation: overflow control part.
531             *
532             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
533             * it's real encoding and we need to make sure we don't go so far from
534             * what is our ideal scaled curve.
535             *-----------------------------------------------------------------------*/
536    
537                          KFdistance -= rc->param.min_key_interval;          /* Compute the overflow we should compensate */
538            if (s->type != XVID_TYPE_IVOP) {
539                    double frametype_factor;
540                    double framesize_factor;
541    
542                          if (KFdistance >= 0) {                  /* Take only the desired part of overflow */
543                                  int KF_min_size;                  overflow = rc->overflow;
544    
545                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                  /* Factor that will take care to decrease the overflow applied
546                                  if (KF_min_size < 1)                   * according to the importance of this frame type in term of
547                                          KF_min_size = 1;                   * overall size */
548                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
549                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
550                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
551                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
552                    frametype_factor  = 1/frametype_factor;
553    
554                    /* Factor that will take care not to compensate too much for this frame
555                     * size */
556                    framesize_factor  = dbytes;
557                    framesize_factor /= rc->avg_length[s->type-1];
558    
559                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  /* Treat only the overflow part concerned by this frame type and size */
560                                          (rc->param.kftreshold - rc->param.min_key_interval);                  overflow *= frametype_factor;
561    #if 0
562                    /* Leave this one alone, as it impacts badly on quality */
563                    overflow *= framesize_factor;
564    #endif
565    
566                                  if (desired < 1)                  /* Apply the overflow strength imposed by the user */
567                                          desired = 1;                  overflow *= (rc->param.overflow_control_strength/100.0f);
568                          }          } else {
569                  }                  /* no overflow applied in IFrames because:
570                     *  - their role is important as they're references for P/BFrames.
571                     *  - there aren't much in typical sequences, so if an IFrame overflows too
572                     *    much, this overflow may impact the next IFrame too much and generate
573                     *    a sequence of poor quality frames */
574                    overflow = 0;
575          }          }
576    
577          /*          /* Make sure we are not trying to compensate more overflow than we even have */
578           * 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))  
579                  overflow = rc->overflow;                  overflow = rc->overflow;
580    
581          /* Make sure overflow doesn't run away */          /* Make sure the overflow doesn't make the frame size to get out of the range
582          if (overflow > desired * rc->param.max_overflow_improvement / 100) {           * [-max_degradation..+max_improvment] */
583                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
584                          overflow * rc->param.max_overflow_improvement / 100;                  if(overflow <= dbytes)
585          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
586                  desired += desired * rc->param.max_overflow_degradation / -100;                  else
587                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
588            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
589                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
590          } else {          } else {
591                  desired += overflow;                  dbytes += overflow;
592          }          }
593    
594          /* Make sure we are not higher than desired frame size */          /*-------------------------------------------------------------------------
595          if (desired > rc->max_length) {           * Frame bit allocation last part:
596             *
597             * Cap frame length so we don't reach neither bigger frame sizes than first
598             * pass nor smaller than the allowed minimum.
599             *-----------------------------------------------------------------------*/
600    
601            if (dbytes > s->length) {
602                    dbytes = s->length;
603            } else if (dbytes < rc->min_length[s->type-1]) {
604                    dbytes = rc->min_length[s->type-1];
605            } else if (dbytes > rc->max_length) {
606                    /* ToDo: this condition is always wrong as max_length == maximum frame
607                     * length of first pass, so the first condition already caps the frame
608                     * size... */
609                  capped_to_max_framesize = 1;                  capped_to_max_framesize = 1;
610                  desired = rc->max_length;                  dbytes = rc->max_length;
611                  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",
612                                  data->frame_num);                                  data->frame_num);
613          }          }
614    
615          /* Make sure to not scale below the minimum framesize */          /*------------------------------------------------------------------------
616          if (desired < rc->min_length[s->type-1]) {           * Desired frame length <-> quantizer mapping
617                  desired = rc->min_length[s->type-1];           *-----------------------------------------------------------------------*/
618                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
619                                  data->frame_num);  #ifdef BQUANT_PRESCALE
620            /* For bframes we prescale the quantizer to avoid too high quant scaling */
621            if(s->type == XVID_TYPE_BVOP) {
622    
623                    twopass_stat_t *b_ref = s;
624    
625                    /* Find the reference frame */
626                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
627                            b_ref--;
628    
629                    /* Compute the original quant */
630                    s->quant  = 2*(100*s->quant - data->bquant_offset);
631                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
632                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
633          }          }
634    #endif
635    
636          /*          /* Don't laugh at this very 'simple' quant<->size relationship, it
637           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * proves to be acurate enough for our algorithm */
638           * proves to be acurate enough for our algorithm          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
639           */  
640          scaled_quant = (double)s->quant*(double)s->length/(double)desired;  #ifdef COMPENSATE_FORMULA
641            /* We know xvidcore will apply the bframe formula again, so we compensate
642             * it right now to make sure we would not apply it twice */
643            if(s->type == XVID_TYPE_BVOP) {
644    
645                    twopass_stat_t *b_ref = s;
646    
647                    /* Find the reference frame */
648                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
649                            b_ref--;
650    
651                    /* Compute the quant it would be if the core did not apply the bframe
652                     * formula */
653                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
654                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
655                    scaled_quant /= data->bquant_ratio;
656            }
657    #endif
658    
659          /*          /* Quantizer has been scaled using floating point operations/results, we
660           * Quantizer has been scaled using floating point operations/results, we           * must cast it to integer */
          * must cast it to integer  
          */  
661          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
662    
663          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 513  Line 665 
665                  data->quant = 1;                  data->quant = 1;
666          } else if (data->quant > 31) {          } else if (data->quant > 31) {
667                  data->quant = 31;                  data->quant = 31;
668          } else if (s->type != XVID_TYPE_IVOP) {          } else {
669    
670                  /*                  /* 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  
671                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
672                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
673                   */                   * unit. */
674                  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;
675    
676                  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 680 
680                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
681                          data->quant--;                          data->quant--;
682                  }                  }
   
683          }          }
684    
685          /*          /* 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  
686           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
687           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
688           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
689           * 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,
690           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
691          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
692                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
693          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
694                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
695          }          }
696    
697          /*          /* 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"  
698           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
699           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
700          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) {
701    
702                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
703                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
704                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
705                                          "[%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",
706                                          data->frame_num);                                          data->frame_num);
707                  }                  }
708                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
709                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
710                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
711                                          "[%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",
712                                          data->frame_num);                                          data->frame_num);
713                  }                  }
714          }          }
715    
716          /*          /* We don't want to pollute the RC histerisis when our computed quant has
717           * 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  
          */  
718          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
719                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
720    
721          /* Force frame type */          /* Don't forget to force 1st pass frame type ;-) */
722          data->type = s->type;          data->type = s->type;
723    
724          return 0;          return 0;
# Line 587  Line 731 
731  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
732  {  {
733          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
734          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
735    
736          /* Insufficent stats data */          /* Insufficent stats data */
737          if (data->frame_num >= rc->num_frames)          if (data->frame_num >= rc->num_frames)
738                  return 0;                  return 0;
739    
740          rc->quant_count[data->quant]++;          /* Update the quantizer counter */
741            rc->quant_count[s->type-1][data->quant]++;
742    
743            /* Update the frame type overflow */
744          if (data->type == XVID_TYPE_IVOP) {          if (data->type == XVID_TYPE_IVOP) {
745                  int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
746    
747                    if(rc->KF_idx != rc->num_frames -1) {
748                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
749                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
750                    }
751    
752                    /* Flush Keyframe overflow accumulator */
753                  rc->overflow += rc->KFoverflow;                  rc->overflow += rc->KFoverflow;
754    
755                    /* Store the frame overflow to the keyframe accumulator */
756                  rc->KFoverflow = s->desired_length - data->length;                  rc->KFoverflow = s->desired_length - data->length;
757    
758                  if (kfdiff > 1) {  /* non-consecutive keyframes */                  if (kfdiff > 1) {
759                            /* Non-consecutive keyframes case:
760                             * We can then divide this total keyframe overflow into equal parts
761                             * that we will distribute into regular overflow at each frame
762                             * between the sequence bounded by two IFrames */
763                          rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                          rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
764                  }else{ /* consecutive keyframes */                  } else {
765                            /* Consecutive keyframes case:
766                             * Flush immediatly the keyframe overflow and reset keyframe
767                             * overflow */
768                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
769                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
770                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
771                  }                  }
772                  rc->KF_idx++;                  rc->KF_idx++;
773          } else {          } else {
774                  /* distribute part of the keyframe overflow */                  /* Accumulate the frame overflow */
775                  rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
776    
777                    /* Distribute part of the keyframe overflow */
778                    rc->overflow += rc->KFoverflow_partial;
779    
780                    /* Don't forget to substract that same amount from the total keyframe
781                     * overflow */
782                  rc->KFoverflow -= rc->KFoverflow_partial;                  rc->KFoverflow -= rc->KFoverflow_partial;
783          }          }
784    
785          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);
786            rc->real_total += data->length;
787    
788            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",
789                          data->frame_num,                          data->frame_num,
790                          frame_type[data->type-1],                          frame_type[data->type-1],
791                          data->quant,                          data->quant,
792                          s->length,                          s->length,
793                          s->scaled_length,                          s->scaled_length,
                         data->length,  
794                          s->desired_length,                          s->desired_length,
795                            s->desired_length - s->error,
796                            -s->error,
797                          rc->overflow);                          rc->overflow);
798    
799          return(0);          return(0);
# Line 632  Line 803 
803   * Helper functions definition   * Helper functions definition
804   ****************************************************************************/   ****************************************************************************/
805    
806    /* Default buffer size for reading lines */
807  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
808    
809  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
810    static char *skipspaces(char *string);
811    static int iscomment(char *string);
812    static char *readline(FILE *f);
813    
814    /* This function counts the number of frame entries in the stats file
815     * It also counts the number of I Frames */
816  static int  static int
817  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
818  {  {
819          FILE * f;          FILE * f;
820          int n, ignore;          char *line;
821          char type;          int lines;
822    
823          rc->num_frames = 0;          rc->num_frames = 0;
824          rc->num_keyframes = 0;          rc->num_keyframes = 0;
825    
826          if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
827                  return 0;                  return(-1);
828    
829          while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
830                                            &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
831                  if (type == 'i') {  
832                          rc->num_frames++;                  char *ptr;
833                    char type;
834                    int fields;
835    
836                    lines++;
837    
838                    /* We skip spaces */
839                    ptr = skipspaces(line);
840    
841                    /* Skip coment lines or empty lines */
842                    if(iscomment(ptr) || *ptr == '\0') {
843                            free(line);
844                            continue;
845                    }
846    
847                    /* Read the stat line from buffer */
848                    fields = sscanf(ptr, "%c", &type);
849    
850                    /* Valid stats files have at least 7 fields */
851                    if (fields == 1) {
852                            switch(type) {
853                            case 'i':
854                            case 'I':
855                          rc->num_keyframes++;                          rc->num_keyframes++;
856                  }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
857                            case 'P':
858                            case 'b':
859                            case 'B':
860                            case 's':
861                            case 'S':
862                          rc->num_frames++;                          rc->num_frames++;
863                                    break;
864                            default:
865                                    DPRINTF(XVID_DEBUG_RC,
866                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
867                                                    lines, type);
868                  }                  }
869                    } else {
870                                    DPRINTF(XVID_DEBUG_RC,
871                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
872                                                    lines, 7-fields);
873          }          }
874    
875                    /* Free the line buffer */
876                    free(line);
877            }
878    
879            /* We are done with the file */
880          fclose(f);          fclose(f);
881    
882          return 1;          return(0);
883  }  }
884    
885  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
886  static int  static int
887  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
888  {  {
889          FILE * f;          FILE * f;
890          int i, not_scaled;          int processed_entries;
   
891    
892          if ((f = fopen(filename, "rt"))==NULL)          /* Opens the file */
893                  return 0;          if ((f = fopen(filename, "rb"))==NULL)
894                    return(-1);
895    
896          i = 0;          processed_entries = 0;
897          not_scaled = 0;          while(processed_entries < rc->num_frames) {
         while(i < rc->num_frames) {  
                 stat_t * s = &rc->stats[i];  
                 int n;  
898                  char type;                  char type;
899                    int fields;
900                    twopass_stat_t * s = &rc->stats[processed_entries];
901                    char *line, *ptr;
902    
903                    /* Read the line from the file */
904                    if((line = readline(f)) == NULL)
905                            break;
906    
907                    /* We skip spaces */
908                    ptr = skipspaces(line);
909    
910                    /* Skip comment lines or empty lines */
911                    if(iscomment(ptr) || *ptr == '\0') {
912                            free(line);
913                            continue;
914                    }
915    
916                    /* Reset this field that is optional */
917                  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;  
                 }  
918    
919                  if (type == 'i') {                  /* Convert the fields */
920                    fields = sscanf(ptr,
921                                                    "%c %d %d %d %d %d %d %d\n",
922                                                    &type,
923                                                    &s->quant,
924                                                    &s->blks[0], &s->blks[1], &s->blks[2],
925                                                    &s->length, &s->invariant /* not really yet */,
926                                                    &s->scaled_length);
927    
928                    /* Free line buffer, we don't need it anymore */
929                    free(line);
930    
931                    /* Fail silently, this has probably been warned in
932                     * statsfile_count_frames */
933                    if(fields != 7 && fields != 8)
934                            continue;
935    
936                    /* Convert frame type and compute the invariant length part */
937                    switch(type) {
938                    case 'i':
939                    case 'I':
940                          s->type = XVID_TYPE_IVOP;                          s->type = XVID_TYPE_IVOP;
941                  }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
942                            break;
943                    case 'p':
944                    case 'P':
945                    case 's':
946                    case 'S':
947                          s->type = XVID_TYPE_PVOP;                          s->type = XVID_TYPE_PVOP;
948                  }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
949                            break;
950                    case 'b':
951                    case 'B':
952                          s->type = XVID_TYPE_BVOP;                          s->type = XVID_TYPE_BVOP;
953                  }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
954                          DPRINTF(XVID_DEBUG_RC, "WARNING: unknown stats frame type, assuming pvop\n");                          break;
955                          s->type = XVID_TYPE_PVOP;                  default:
956                            /* Same as before, fail silently */
957                            continue;
958                  }                  }
959    
960                  i++;                  /* Ok it seems it's been processed correctly */
961                    processed_entries++;
962          }          }
963    
964          rc->num_frames = i;          /* Close the file */
   
965          fclose(f);          fclose(f);
966    
967          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);  
         }  
968  }  }
 #endif  
969    
970  /* pre-process the statistics data  /* pre-process the statistics data
971     - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
972     - set keyframes_locations   * - set keyframes_locations */
 */  
   
973  static void  static void
974  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
975  {  {
976          int i,j;          int i,j;
977    
978          /*          /* *rc fields initialization
          * *rc fields initialization  
979           * 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
980           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
981          for (i=0; i<3; i++) {          for (i=0; i<3; i++) {
982                  rc->count[i]=0;                  rc->count[i]=0;
983                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
984                    rc->tot_invariant[i] = 0;
985                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
986          }          }
987    
988          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
989    
990          /*          /* Loop through all frames and find/compute all the stuff this function
991           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
992          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
993                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
994    
995                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
996                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
997                    rc->tot_invariant[s->type-1] += s->invariant;
998    
999                  if (s->length < rc->min_length[s->type-1]) {                  if (s->length < rc->min_length[s->type-1]) {
1000                          rc->min_length[s->type-1] = s->length;                          rc->min_length[s->type-1] = s->length;
# Line 770  Line 1010 
1010                  }                  }
1011          }          }
1012    
1013          /*          /* NB:
          * Nota Bene:  
1014           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1015           * 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
1016           * 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
1017           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1018          rc->keyframe_locations[j] = i;          rc->keyframe_locations[j] = i;
1019    
1020          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]);
1021          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]);
1022          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]);
1023  }  }
1024    
1025  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1026  static void  static void
1027  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1028  {  {
# Line 794  Line 1031 
1031    
1032          rc->avg_weight = 0.0;          rc->avg_weight = 0.0;
1033          rc->tot_quant = 0;          rc->tot_quant = 0;
1034            rc->tot_quant_invariant = 0;
1035    
1036          if (create->num_zones == 0) {          if (create->num_zones == 0) {
1037                  for (j = 0; j < rc->num_frames; j++) {                  for (j = 0; j < rc->num_frames; j++) {
# Line 832  Line 1069 
1069                                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1070                                  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;
1071                                  rc->tot_quant += rc->stats[j].length;                                  rc->tot_quant += rc->stats[j].length;
1072                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1073                          }                          }
1074                  }                  }
1075          }          }
1076          rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;          rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1077    
1078          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);
1079  }  }
1080    
1081    
1082  /* scale the curve */  /* scale the curve */
   
1083  static void  static void
1084  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1085  {  {
1086          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1087          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t pass1_length;
1088            int64_t total_invariant;
1089          double scaler;          double scaler;
1090          int i, num_MBs;          int i, num_MBs;
1091    
1092            /* We only scale texture data ! */
1093            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1094            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1095            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1096            /* don't forget to substract header bytes used in quant zones, otherwise we
1097             * counting them twice */
1098            total_invariant -= rc->tot_quant_invariant;
1099    
1100            /* We remove the bytes used by the fixed quantizer zones during first pass
1101             * with the same quants, so we know very precisely how much that
1102             * represents */
1103            target  = rc->target;
1104            target -= rc->tot_quant;
1105    
1106            /* Do the same for the first pass data */
1107            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1108            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1109            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1110            pass1_length -= rc->tot_quant;
1111    
1112          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1113          scaler = (double)target / (double)pass1_length;          scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1114    
1115          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          if ((target - total_invariant) <= 0 ||
1116                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  (pass1_length - total_invariant) <= 0 ||
1117                    target >= pass1_length) {
1118                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1119                  scaler = 1.0;                  scaler = 1.0;
1120          }          }
1121    
1122          DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1123                          "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
1124                          (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.  
1125           *           *
1126           * We compare these hardcoded values with observed values in first pass           * We compare these hardcoded values with observed values in first pass
1127           * (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];  
1128    
1129          if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)          /* Number of MBs */
1130                  rc->min_length[0] = ((num_MBs*22) + 240) / 8;          num_MBs  = rc->stats[0].blks[0];
1131            num_MBs += rc->stats[0].blks[1];
1132            num_MBs += rc->stats[0].blks[2];
1133    
1134            /* Minimum for I frames */
1135            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1136                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1137    
1138            /* Minimum for P/S frames */
1139            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1140                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1141    
1142            /* Minimum for B frames */
1143            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1144                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1145    
1146          if(rc->min_length[1] > ((num_MBs) + 88)  / 8)          /* Perform an initial scale pass.
1147                  rc->min_length[1] = ((num_MBs) + 88)  / 8;           *
   
         if(rc->min_length[2] > 8)  
                 rc->min_length[2] = 8;  
   
         /*  
          * Perform an initial scale pass.  
1148           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1149           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1150           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1151          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1152                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1153                  int len;                  int len;
1154    
1155                    /* No need to scale frame length for which a specific quantizer is
1156                     * specified thanks to zones */
1157                  if (s->zone_mode == XVID_ZONE_QUANT) {                  if (s->zone_mode == XVID_ZONE_QUANT) {
1158                          s->scaled_length = s->length;                          s->scaled_length = s->length;
1159                          continue;                          continue;
1160                  }                  }
1161    
1162                  /* Compute the scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1163                  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);
1164    
1165                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1166                  if (len < rc->min_length[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1167                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1168                             * computed minimum */
1169                          s->scaled_length = rc->min_length[s->type-1];                          s->scaled_length = rc->min_length[s->type-1];
1170    
1171                            /* Remove both scaled and original size from their respective
1172                             * total counters, as we prepare a second pass for 'regular'
1173                             * frames */
1174                          target -= s->scaled_length;                          target -= s->scaled_length;
1175                          pass1_length -= s->length;                          pass1_length -= s->length;
1176                  } else {                  } else {
# Line 912  Line 1179 
1179                  }                  }
1180          }          }
1181    
1182          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1183          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1184    
1185            /* Scaling factor for 'regular' frames */
1186            scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1187    
1188          /* Detect undersizing */          /* Detect undersizing */
1189          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1190                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1191                  scaler = 1.0;                  scaler = 1.0;
1192          }          }
1193    
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
   
1194          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1195          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1196                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1197    
1198                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1199                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1200                          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);
1201          }          }
1202    
1203            /* Job done */
1204            return;
1205  }  }
1206    
1207    /* Apply all user settings to the scaled curve
1208     * This implies:
1209     *   keyframe boosting
1210     *   high/low compression */
1211  static void  static void
1212  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1213  {  {
1214          int i;          int i;
1215          double total1, total2;          int64_t ivop_boost_total;
         uint64_t ivop_boost_total;  
1216    
1217          ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1218          rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1219    
1220          for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1221                  rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1222                    twopass_stat_t *s = &rc->stats[i];
1223                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1224          }          }
1225    
1226            /* First we compute the total amount of bits needed, as being described by
1227             * the scaled distribution. During this pass over the complete stats data,
1228             * we see how much bits two user settings will get/give from/to p&b frames:
1229             *  - keyframe boosting
1230             *  - keyframe distance penalty */
1231            rc->KF_idx = 0;
1232            ivop_boost_total = 0;
1233          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1234                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
                 rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1235    
1236                    /* Some more work is needed for I frames */
1237                  if (s->type == XVID_TYPE_IVOP) {                  if (s->type == XVID_TYPE_IVOP) {
1238                          ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1239    
1240                            /* Accumulate bytes needed for keyframe boosting */
1241                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1242    
1243    #if 0 /* ToDo: decide how to apply kfthresholding */
1244    #endif
1245                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1246                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1247                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1248    
1249                            /* Accumulate the ivop boost */
1250                            ivop_boost_total += ivop_boost;
1251    
1252                            /* Don't forget to update the keyframe index */
1253                            rc->KF_idx++;
1254                  }                  }
1255          }          }
1256    
1257          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
1258                                             (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1259             * This ratio has to be applied to p/b/s frames in order to reserve
1260             * additional bits for keyframes (keyframe boosting) or if too much
1261             * keyframe distance is applied, bits retrieved from the keyframes.
1262             *
1263             * ie pb_length *= rc->pb_iboost_tax_ratio;
1264             *
1265             *    gives the ideal length of a p/b frame */
1266    
1267            /* Compute the total length of p/b/s frames (temporary storage into
1268             * movie_curve) */
1269            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1270            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1271    
1272            /* Compute the ratio described above
1273             *     taxed_total = sum(0, n, tax*scaled_length)
1274             * <=> taxed_total = tax.sum(0, n, scaled_length)
1275             * <=> tax = taxed_total / original_total */
1276            rc->pb_iboost_tax_ratio =
1277                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1278                    rc->pb_iboost_tax_ratio;
1279    
1280            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1281                            rc->pb_iboost_tax_ratio);
1282    
1283            /* Compute the average size of frames per frame type */
1284          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
1285                  if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1286                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1287                          rc->avg_length[i] = 1;                          rc->avg_length[i] = 1;
1288                  }else{                  }else{
1289                          rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1290                  }  
1291                            if (i == (XVID_TYPE_IVOP-1)) {
1292                                    /* I Frames total has to be added the boost total */
1293                                    rc->avg_length[i] += ivop_boost_total;
1294                            } else {
1295                                    /* P/B frames has to taxed */
1296                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1297          }          }
1298    
1299  /* --- */                          /* Finally compute the average frame size */
1300                            rc->avg_length[i] /= (double)rc->count[i];
1301                    }
1302            }
1303    
1304          total1=total2=0;          /* Assymetric curve compression */
1305            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1306                    double symetric_total;
1307                    double assymetric_delta_total;
1308    
1309                    /* Like I frame boosting, assymetric curve compression modifies the total
1310                     * amount of needed bits, we must compute the ratio so we can prescale
1311                     lengths */
1312                    symetric_total = 0;
1313                    assymetric_delta_total = 0;
1314          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1315                  stat_t * s = &rc->stats[i];                          double assymetric_delta;
1316                            double dbytes;
1317                            twopass_stat_t * s = &rc->stats[i];
1318    
1319                  if (s->type != XVID_TYPE_IVOP) {                          /* I Frames are not concerned by assymetric scaling */
1320                          double dbytes,dbytes2;                          if (s->type == XVID_TYPE_IVOP)
1321                                    continue;
1322    
1323                          dbytes = s->scaled_length / rc->movie_curve;                          /* During the real run, we would have to apply the iboost tax */
1324                          dbytes2 = 0; /* XXX: warning */                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                         total1 += dbytes;  
1325    
1326                          if (dbytes > rc->avg_length[s->type-1]) {                          /* Update the symmetric curve compression total */
1327                                  dbytes2=((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          symetric_total += dbytes;
1328    
1329                            /* Apply assymetric curve compression */
1330                            if (dbytes > rc->avg_length[s->type-1])
1331                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1332                            else
1333                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1334    
1335                            /* Cap to the minimum frame size if needed */
1336                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1337                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1338    
1339                            /* Accumulate after assymetric curve compression */
1340                            assymetric_delta_total += assymetric_delta;
1341                    }
1342    
1343                    /* Compute the tax that all p/b frames have to pay in order to respect the
1344                     * bit distribution changes that the assymetric compression curve imposes
1345                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1346                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1347                     *         ratio = assymetric_total / symmetric_total */
1348                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1349                          } else {                          } else {
1350                                  dbytes2 = ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1351                          }                          }
1352    
1353                          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];  
1354    
1355                          total2 += dbytes2;          /* Last bits that need to be reset */
1356            rc->overflow = 0;
1357            rc->KFoverflow = 0;
1358            rc->KFoverflow_partial = 0;
1359            rc->KF_idx = 0;
1360            rc->desired_total = 0;
1361            rc->real_total = 0;
1362    
1363            /* Job done */
1364            return;
1365                  }                  }
1366    
1367    /*****************************************************************************
1368     * Still more low level stuff (nothing to do with stats treatment)
1369     ****************************************************************************/
1370    
1371    /* This function returns an allocated string containing a complete line read
1372     * from the file starting at the current position */
1373    static char *
1374    readline(FILE *f)
1375    {
1376            char *buffer = NULL;
1377            int buffer_size = 0;
1378            int pos = 0;
1379    
1380            do {
1381                    int c;
1382    
1383                    /* Read a character from the stream */
1384                    c = fgetc(f);
1385    
1386                    /* Is that EOF or new line ? */
1387                    if(c == EOF || c == '\n')
1388                            break;
1389    
1390                    /* Do we have to update buffer ? */
1391                    if(pos >= buffer_size - 1) {
1392                            buffer_size += BUF_SZ;
1393                            buffer = (char*)realloc(buffer, buffer_size);
1394                            if (buffer == NULL)
1395                                    return(NULL);
1396          }          }
1397    
1398          rc->curve_comp_scale = total1 / total2;                  buffer[pos] = c;
1399                    pos++;
1400            } while(1);
1401    
1402          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: pframe%d bframe:%d\n",          /* Read \n or EOF */
1403                          (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale),          if (buffer == NULL) {
1404                          (int)(rc->avg_length[XVID_TYPE_BVOP-1] * rc->curve_comp_scale));                  /* EOF, so we reached the end of the file, return NULL */
1405                    if(feof(f))
1406                            return(NULL);
1407    
1408          rc->overflow = 0;                  /* Just an empty line with just a newline, allocate a 1 byte buffer to
1409          rc->KFoverflow = 0;                   * store a zero length string */
1410          rc->KFoverflow_partial = 0;                  buffer = (char*)malloc(1);
1411          rc->KF_idx = 1;                  if(buffer == NULL)
1412                            return(NULL);
1413            }
1414    
1415            /* Zero terminated string */
1416            buffer[pos] = '\0';
1417    
1418            return(buffer);
1419  }  }
1420    
1421    /* This function returns a pointer to the first non space char in the given
1422     * string */
1423    static char *
1424    skipspaces(char *string)
1425    {
1426            const char spaces[] =
1427                    {
1428                            ' ','\t','\0'
1429                    };
1430            const char *spacechar = spaces;
1431    
1432            if (string == NULL) return(NULL);
1433    
1434            while (*string != '\0') {
1435                    /* Test against space chars */
1436                    while (*spacechar != '\0') {
1437                            if (*string == *spacechar) {
1438                                    string++;
1439                                    spacechar = spaces;
1440                                    break;
1441                            }
1442                            spacechar++;
1443                    }
1444    
1445                    /* No space char */
1446                    if (*spacechar == '\0') return(string);
1447            }
1448    
1449            return(string);
1450    }
1451    
1452    /* This function returns a boolean that tells if the string is only a
1453     * comment */
1454    static int
1455    iscomment(char *string)
1456    {
1457            const char comments[] =
1458                    {
1459                            '#',';', '%', '\0'
1460                    };
1461            const char *cmtchar = comments;
1462            int iscomment = 0;
1463    
1464            if (string == NULL) return(1);
1465    
1466            string = skipspaces(string);
1467    
1468            while(*cmtchar != '\0') {
1469                    if(*string == *cmtchar) {
1470                            iscomment = 1;
1471                            break;
1472                    }
1473                    cmtchar++;
1474            }
1475    
1476            return(iscomment);
1477    }
1478    
1479    #if 0
1480    static void
1481    stats_print(rc_2pass2_t * rc)
1482    {
1483            int i;
1484            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1485    
1486            for (i=0; i<rc->num_frames; i++) {
1487                    twopass_stat_t *s = &rc->stats[i];
1488                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1489                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1490                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1491            }
1492    }
1493    #endif
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