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revision 1053, Mon Jun 9 01:25:19 2003 UTC revision 1247, Mon Dec 8 12:38:04 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 1.1.2.19 2003-06-09 01:22:58 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.30 2003-12-08 12:38:04 syskin Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #undef COMPENSATE_FORMULA
33    
34  #include <stdio.h>  #include <stdio.h>
35  #include <math.h>  #include <math.h>
36  #include <limits.h>  #include <limits.h>
# Line 41  Line 43 
43   ****************************************************************************/   ****************************************************************************/
44    
45  #define DEFAULT_KEYFRAME_BOOST 0  #define DEFAULT_KEYFRAME_BOOST 0
46  #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP  #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
 #define DEFAULT_BITRATE_PAYBACK_DELAY 250  
47  #define DEFAULT_CURVE_COMPRESSION_HIGH 0  #define DEFAULT_CURVE_COMPRESSION_HIGH 0
48  #define DEFAULT_CURVE_COMPRESSION_LOW 0  #define DEFAULT_CURVE_COMPRESSION_LOW 0
49  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60
50  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60
51    
52  /* Keyframe settings */  /* Keyframe settings */
 #define DEFAULT_KFTRESHOLD 10  
53  #define DEFAULT_KFREDUCTION 20  #define DEFAULT_KFREDUCTION 20
54  #define DEFAULT_MIN_KEY_INTERVAL 1  #define DEFAULT_KFTHRESHOLD 1
55    
56  /*****************************************************************************  /*****************************************************************************
57   * Structures   * Structures
# Line 61  Line 61 
61  typedef struct {  typedef struct {
62      int type;               /* first pass type */      int type;               /* first pass type */
63      int quant;              /* first pass quant */      int quant;              /* first pass quant */
64            int quant2;             /* Second pass quant */
65          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
66      int length;             /* first pass length */      int length;             /* first pass length */
67      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
68      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
69            int error;
70    
71      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
72      double weight;      double weight;
73  } stat_t;  } twopass_stat_t;
74    
75  /* Context struct */  /* Context struct */
76  typedef struct  typedef struct
77  {  {
78      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
79    
80      /* constant statistical data */          /*----------------------------------
81             * constant statistical data
82             *--------------------------------*/
83    
84            /* Number of frames of the sequence */
85          int num_frames;          int num_frames;
         int num_keyframes;  
         uint64_t target;        /* target filesize */  
86    
87          int count[3];   /* count of each frame types */          /* Number of Intra frames of the sequence */
88          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 */  
89    
90          /* zone statistical data */          /* Target filesize to reach */
91          double avg_weight;  /* average weight */          uint64_t target;
         int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
92    
93            /* Count of each frame types */
94            int count[3];
95    
96          double curve_comp_scale;          /* Total length of each frame types (1st pass) */
97          double movie_curve;          uint64_t tot_length[3];
98    
99          /* dynamic */          /* Average length of each frame types (used first for 1st pass data and
100             * then for scaled averages */
101            double avg_length[3];
102    
103            /* Minimum frame length allowed for each frame type */
104            int min_length[3];
105    
106            /* Total bytes per frame type once the curve has been scaled
107             * NB: advanced parameters do not change this value. This field
108             *     represents the total scaled w/o any advanced settings */
109            uint64_t tot_scaled_length[3];
110    
111            /* Maximum observed frame size observed during the first pass, the RC
112             * will try tp force all frame sizes in the second pass to be under that
113             * limit */
114            int max_length;
115    
116            /*----------------------------------
117             * Zones statistical data
118             *
119             * ToDo: Fix zones, current
120             *       implementation is buggy
121             *--------------------------------*/
122    
123            /* Average weight of the zones */
124            double avg_weight;
125    
126            /* Total length used by XVID_ZONE_QUANT zones */
127            int64_t tot_quant;
128    
129            /*----------------------------------
130             * Advanced settings helper ratios
131             *--------------------------------*/
132    
133            /* This the ratio that has to be applied to all p/b frames in order
134             * to reserve/retrieve bits for/from keyframe boosting and consecutive
135             * keyframe penalty */
136            double pb_iboost_tax_ratio;
137    
138            /* This the ratio to apply to all b/p frames in order to respect the
139             * assymetric curve compression while respecting a target filesize
140             * NB: The assymetric delta gain has to be computed before this ratio
141             *     is applied, and then the delta is added to the scaled size */
142            double assymetric_tax_ratio;
143    
144            /*----------------------------------
145             * Data from the stats file kept
146             * into RAM for easy access
147             *--------------------------------*/
148    
149            /* Array of keyframe locations
150             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
151             *     keyframe */
152          int * keyframe_locations;          int * keyframe_locations;
         stat_t * stats;  
153    
154            /* Index of the last keyframe used in the keyframe_location */
155            int KF_idx;
156    
157            /* Array of all 1st pass data file -- see the twopass_stat_t structure
158             * definition for more details */
159            twopass_stat_t * stats;
160    
161            /*----------------------------------
162             * Histerysis helpers
163             *--------------------------------*/
164    
165            /* This field holds the int2float conversion errors of each quant per
166             * frame type, this allow the RC to keep track of rouding error and thus
167             * increase or decrease the chosen quant according to this residue */
168          double quant_error[3][32];          double quant_error[3][32];
169          int quant_count[32];  
170            /* This fields stores the count of each quant usage per frame type
171             * No real role but for debugging */
172            int quant_count[3][32];
173    
174            /* Last valid quantizer used per frame type, it allows quantizer
175             * increament/decreament limitation in order to avoid big image quality
176             * "jumps" */
177          int last_quant[3];          int last_quant[3];
178    
179          double curve_comp_error;          /*----------------------------------
180          int overflow;           * Overflow control
181          int KFoverflow;           *--------------------------------*/
182          int KFoverflow_partial;  
183          int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
184            double overflow;
185    
186            /* Total overflow for keyframes -- not distributed directly */
187            double KFoverflow;
188    
189            /* Amount of keyframe overflow to introduce to the global p/b frame
190             * overflow counter at each encoded frame */
191            double KFoverflow_partial;
192    
193            /* Unknown ???
194             * ToDo: description */
195          double fq_error;          double fq_error;
196    
197            /*----------------------------------
198             * Debug
199             *--------------------------------*/
200            double desired_total;
201            double real_total;
202  } rc_2pass2_t;  } rc_2pass2_t;
203    
204    
# Line 132  Line 220 
220  {  {
221      switch(opt) {      switch(opt) {
222      case XVID_PLG_INFO :      case XVID_PLG_INFO :
223            case XVID_PLG_FRAME :
224          return 0;          return 0;
225    
226      case XVID_PLG_CREATE :      case XVID_PLG_CREATE :
# Line 155  Line 244 
244   ****************************************************************************/   ****************************************************************************/
245    
246  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
247  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
248  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
249  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);
250  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
251  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
252  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
253    #if 0
254    static void stats_print(rc_2pass2_t * rc);
255    #endif
256    
257  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
258   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 178  Line 270 
270    
271      rc->param = *param;      rc->param = *param;
272    
273          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
274  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
275      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
276          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
277          _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);  
278      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
279      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
280      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
281      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
282    
283      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
284      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
285      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
286  #undef _INIT  #undef _INIT
287    
288          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
289          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
290                  int j;                  int j;
291                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
292                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
293                            rc->quant_count[i][j] = 0;
294                    }
295          }          }
296    
297          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
298    
299          rc->fq_error = 0;          rc->fq_error = 0;
300    
301          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
302          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
303                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
304                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
305                  free(rc);                  free(rc);
306                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
307          }          }
308    
309      /* Allocate the stats' memory */      /* Allocate the stats' memory */
310          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
311          free(rc);          free(rc);
312          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
313      }      }
314    
315      /*          /* Allocate keyframes location's memory
316           * 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  
          */  
317          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
318          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
319                  free(rc->stats);                  free(rc->stats);
320                  free(rc);                  free(rc);
321                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
322          }          }
323    
324          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
325                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
326                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
327                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
328                  free(rc->stats);                  free(rc->stats);
329                  free(rc);                  free(rc);
# Line 244  Line 331 
331          }          }
332    
333          /* Compute the target filesize */          /* Compute the target filesize */
334          if (rc->num_frames  < create->fbase/create->fincr) {          if (rc->param.bitrate<0) {
335                    /* if negative, bitrate equals the target (in kbytes) */
336                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
337            } else if (rc->num_frames  < create->fbase/create->fincr) {
338                  /* 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 */
339                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
340          } else {          } else {
# Line 255  Line 345 
345                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
346          }          }
347    
348          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
349                          create->fbase, create->fincr,                          create->fbase, create->fincr,
350                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
351          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);
352          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
353          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
354            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
355    
356          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
357          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
358          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);
359          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
360                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
361    
362          /*          /* Gathers some information about first pass stats:
          * First data pre processing:  
363           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
364           *     rc->min_size[]           *     rc->min_size[]
365           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 280  Line 371 
371           *  - store keyframe location           *  - store keyframe location
372           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
373           */           */
374          pre_process0(rc);          first_pass_stats_prepare_data(rc);
375    
376          /*          /* When bitrate is not given it means it has been scaled by an external
377           * When bitrate is not given it means it has been scaled by an external           * application */
          * application  
          */  
378          if (rc->param.bitrate) {          if (rc->param.bitrate) {
379                  /* Apply zone settings */                  /* Apply zone settings */
380                  zone_process(rc, create);                  zone_process(rc, create);
381                  /* Perform curve scaling */                  /* Perform internal curve scaling */
382                  internal_scale(rc);                  first_pass_scale_curve_internal(rc);
383          } else {          } else {
384                  /* External scaling -- zones are ignored */                  /* External scaling -- zones are ignored */
385                  for (i=0;i<rc->num_frames;i++) {                  for (i=0;i<rc->num_frames;i++) {
# Line 301  Line 390 
390                  rc->tot_quant = 0;                  rc->tot_quant = 0;
391          }          }
392    
393          pre_process1(rc);          /* Apply advanced curve options, and compute some parameters in order to
394             * shape the curve in the BEFORE/AFTER pair of functions */
395            scaled_curve_apply_advanced_parameters(rc);
396    
397          *handle = rc;          *handle = rc;
398          return(0);          return(0);
# Line 313  Line 404 
404  static int  static int
405  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
406  {  {
407            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
408                            rc->target,
409                            rc->desired_total,
410                            100*rc->desired_total/(double)rc->target,
411                            rc->real_total,
412                            100*rc->real_total/(double)rc->target);
413    
414      free(rc->keyframe_locations);      free(rc->keyframe_locations);
415      free(rc->stats);      free(rc->stats);
416          free(rc);          free(rc);
# Line 325  Line 423 
423  static int  static int
424  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
425  {  {
426          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
427          double dbytes;          double dbytes;
         double curve_temp;  
428          double scaled_quant;          double scaled_quant;
429            double overflow;
430          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
431    
432          /*          /* This function is quite long but easy to understand. In order to simplify
433           * 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.  
          */  
434    
435          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
436      if (data->quant > 0)      if (data->quant > 0)
437                  return(0);                  return(0);
438    
439          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data */
440            if (data->frame_num >= rc->num_frames) {
441                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
442                            data->frame_num);
443                    return(0);
444            }
445    
446            /* Third case: We are in a Quant zone */
447          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
448                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
449                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
# Line 353  Line 454 
454                  return(0);                  return(0);
455          }          }
456    
         /* Third case: insufficent stats data */  
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
457    
458          /* XXX: why by 8 */          /*************************************************************************/
459          overflow = rc->overflow / 8;          /*************************************************************************/
460            /*************************************************************************/
461    
462          /*          /*-------------------------------------------------------------------------
463           * The rc->overflow field represents the overflow in current scene (between two           * Frame bit allocation first part
464           * IFrames) so we must not forget to reset it if we are entering a new scene           *
465           */           * First steps apply user settings, just like it is done in the theoritical
466          if (s->type == XVID_TYPE_IVOP)           * scaled_curve_apply_advanced_parameters
467                  overflow = 0;           *-----------------------------------------------------------------------*/
   
         desired = s->scaled_length;  
   
         dbytes = desired;  
         if (s->type == XVID_TYPE_IVOP)  
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
   
         /*  
          * Apply user's choosen Payback method. Payback helps bitrate to follow the  
          * scaled curve "paying back" past errors in curve previsions.  
          */  
         if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
                 desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
         } else {  
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[s->type-1] / rc->param.bitrate_payback_delay);  
   
                 if (labs(desired) > fabs(rc->curve_comp_error))  
                         desired = (int)rc->curve_comp_error;  
         }  
   
         rc->curve_comp_error -= desired;  
   
         /* XXX: warning */  
         curve_temp = 0;  
468    
469          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {          /* Set desired to what we are wanting to obtain for this frame */
470            dbytes = (double)s->scaled_length;
471    
472                  curve_temp = rc->curve_comp_scale;          /* IFrame user settings*/
473                  if (dbytes > rc->avg_length[s->type-1]) {          if (s->type == XVID_TYPE_IVOP) {
474                          curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);                  /* Keyframe boosting -- All keyframes benefit from it */
475                  } else {                  dbytes += dbytes*rc->param.keyframe_boost / 100;
                         curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
476    
477                  desired += (int)curve_temp;  #if 0 /* ToDo: decide how to apply kfthresholding */
478                  rc->curve_comp_error += curve_temp - (int)curve_temp;  #endif
479          } else {          } else {
                 desired += (int)dbytes;  
                 rc->curve_comp_error += dbytes - (int)dbytes;  
         }  
480    
481                    /* P/S/B frames must reserve some bits for iframe boosting */
482                    dbytes *= rc->pb_iboost_tax_ratio;
483    
484          /*                  /* Apply assymetric curve compression */
485           * 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) {
486           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose                          double assymetric_delta;
487           * many bytes and we would not not gain much quality.  
488           */                          /* Compute the assymetric delta, this is computed before applying
489          if (desired > s->length) {                           * the tax, as done in the pre_process function */
490                  rc->curve_comp_error += desired - s->length;                          if (dbytes > rc->avg_length[s->type-1])
491                  desired = s->length;                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
492          } else {                          else
493                  if (desired < rc->min_length[s->type-1]) {                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
494                          if (s->type == XVID_TYPE_IVOP){  
495                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;                          /* Now we must apply the assymetric tax, else our curve compression
496                             * would not give a theoritical target size equal to what it is
497                             * expected */
498                            dbytes *= rc->assymetric_tax_ratio;
499    
500                            /* Now we can add the assymetric delta */
501                            dbytes += assymetric_delta;
502                          }                          }
                         desired = rc->min_length[s->type-1];  
503                  }                  }
         }  
   
         s->desired_length = desired;  
504    
505          /*          /* That is what we would like to have -- Don't put that chunk after
506           * if this keyframe is too close to the next, reduce it's byte allotment           * overflow control, otherwise, overflow is counted twice and you obtain
507           * XXX: why do we do this after setting the desired length ?           * half sized bitrate sequences */
508           */          s->desired_length  = (int)dbytes;
509            rc->desired_total += dbytes;
510    
511          if (s->type == XVID_TYPE_IVOP) {          /*------------------------------------------------------------------------
512                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];           * Frame bit allocation: overflow control part.
513             *
514                  if (KFdistance < rc->param.kftreshold) {           * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
515             * it's real encoding and we need to make sure we don't go so far from
516             * what is our ideal scaled curve.
517             *-----------------------------------------------------------------------*/
518    
519                          KFdistance -= rc->param.min_key_interval;          /* Compute the overflow we should compensate */
520            if (s->type != XVID_TYPE_IVOP) {
521                    double frametype_factor;
522                    double framesize_factor;
523    
524                          if (KFdistance >= 0) {                  /* Take only the desired part of overflow */
525                                  int KF_min_size;                  overflow = rc->overflow;
526    
527                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                  /* Factor that will take care to decrease the overflow applied
528                                  if (KF_min_size < 1)                   * according to the importance of this frame type in term of
529                                          KF_min_size = 1;                   * overall size */
530                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
531                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
532                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
533                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
534                    frametype_factor  = 1/frametype_factor;
535    
536                    /* Factor that will take care not to compensate too much for this frame
537                     * size */
538                    framesize_factor  = dbytes;
539                    framesize_factor /= rc->avg_length[s->type-1];
540    
541                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  /* Treat only the overflow part concerned by this frame type and size */
542                                          (rc->param.kftreshold - rc->param.min_key_interval);                  overflow *= frametype_factor;
543    #if 0
544                    /* Leave this one alone, as it impacts badly on quality */
545                    overflow *= framesize_factor;
546    #endif
547    
548                                  if (desired < 1)                  /* Apply the overflow strength imposed by the user */
549                                          desired = 1;                  overflow *= (rc->param.overflow_control_strength/100.0f);
550                          }          } else {
551                  }                  /* no overflow applied in IFrames because:
552                     *  - their role is important as they're references for P/BFrames.
553                     *  - there aren't much in typical sequences, so if an IFrame overflows too
554                     *    much, this overflow may impact the next IFrame too much and generate
555                     *    a sequence of poor quality frames */
556                    overflow = 0;
557          }          }
558    
559          /*          /* Make sure we are not trying to compensate more overflow than we even have */
560           * 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))  
561                  overflow = rc->overflow;                  overflow = rc->overflow;
562    
563          /* Make sure overflow doesn't run away */          /* Make sure the overflow doesn't make the frame size to get out of the range
564          if (overflow > desired * rc->param.max_overflow_improvement / 100) {           * [-max_degradation..+max_improvment] */
565                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
566                          overflow * rc->param.max_overflow_improvement / 100;                  if(overflow <= dbytes)
567          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
568                  desired += desired * rc->param.max_overflow_degradation / -100;                  else
569                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
570            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
571                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
572          } else {          } else {
573                  desired += overflow;                  dbytes += overflow;
574          }          }
575    
576          /* Make sure we are not higher than desired frame size */          /*-------------------------------------------------------------------------
577          if (desired > rc->max_length) {           * Frame bit allocation last part:
578             *
579             * Cap frame length so we don't reach neither bigger frame sizes than first
580             * pass nor smaller than the allowed minimum.
581             *-----------------------------------------------------------------------*/
582    
583            if (dbytes > s->length) {
584                    dbytes = s->length;
585            } else if (dbytes < rc->min_length[s->type-1]) {
586                    dbytes = rc->min_length[s->type-1];
587            } else if (dbytes > rc->max_length) {
588                    /* ToDo: this condition is always wrong as max_length == maximum frame
589                     * length of first pass, so the first condition already caps the frame
590                     * size... */
591                  capped_to_max_framesize = 1;                  capped_to_max_framesize = 1;
592                  desired = rc->max_length;                  dbytes = rc->max_length;
593                  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",
594                                  data->frame_num);                                  data->frame_num);
595          }          }
596    
597          /* Make sure to not scale below the minimum framesize */          /*------------------------------------------------------------------------
598          if (desired < rc->min_length[s->type-1]) {           * Desired frame length <-> quantizer mapping
599                  desired = rc->min_length[s->type-1];           *-----------------------------------------------------------------------*/
600                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
601                                  data->frame_num);          /* For bframes we must retrieve the original quant used (sent to xvidcore)
602             * as core applies the bquant formula before writing the stat log entry */
603            if(s->type == XVID_TYPE_BVOP) {
604    
605                    twopass_stat_t *b_ref = s;
606    
607                    /* Find the reference frame */
608                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
609                            b_ref--;
610    
611                    /* Compute the original quant */
612                    s->quant  = 2*(100*s->quant - data->bquant_offset);
613                    s->quant += data->bquant_ratio - 1; /* to avoid rouding issues */
614                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
615            }
616    
617            /* Don't laugh at this very 'simple' quant<->filesize relationship, it
618             * proves to be acurate enough for our algorithm */
619            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
620    
621    #ifdef COMPENSATE_FORMULA
622            /* We know xvidcore will apply the bframe formula again, so we compensate
623             * it right now to make sure we would not apply it twice */
624            if(s->type == XVID_TYPE_BVOP) {
625    
626                    twopass_stat_t *b_ref = s;
627    
628                    /* Find the reference frame */
629                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
630                            b_ref--;
631    
632                    /* Compute the quant it would be if the core did not apply the bframe
633                     * formula */
634                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
635                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
636                    scaled_quant /= data->bquant_ratio;
637          }          }
638    #endif
639    
640          /*          /* Quantizer has been scaled using floating point operations/results, we
641           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * must cast it to integer */
          * proves to be acurate enough for our algorithm  
          */  
         scaled_quant = (double)s->quant*(double)s->length/(double)desired;  
   
         /*  
          * Quantizer has been scaled using floating point operations/results, we  
          * must cast it to integer  
          */  
642          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
643    
644          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 512  Line 646 
646                  data->quant = 1;                  data->quant = 1;
647          } else if (data->quant > 31) {          } else if (data->quant > 31) {
648                  data->quant = 31;                  data->quant = 31;
649          } else if (s->type != XVID_TYPE_IVOP) {          } else {
650    
651                  /*                  /* 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  
652                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
653                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
654                   */                   * unit. */
655                  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;
656    
657                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
# Line 528  Line 661 
661                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
662                          data->quant--;                          data->quant--;
663                  }                  }
   
664          }          }
665    
666          /*          /* 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  
667           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
668           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
669           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
670           * 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,
671           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
672          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
673                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
674          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
675                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
676          }          }
677    
678          /*          /* 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"  
679           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
680           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
681          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) {
682    
683                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
684                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
685                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
686                                          "[%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",
687                                          data->frame_num);                                          data->frame_num);
688                  }                  }
689                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
690                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
691                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
692                                          "[%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",
693                                          data->frame_num);                                          data->frame_num);
694                  }                  }
695          }          }
696    
697          /*          /* We don't want to pollute the RC histerisis when our computed quant has
698           * 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  
          */  
699          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
700                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
701    
702          /* Force frame type */          /* Don't forget to force 1st pass frame type ;-) */
703          data->type = s->type;          data->type = s->type;
704    
705            /* Store the quantizer into the statistics -- Used to compensate the double
706             * formula symptom */
707            s->quant2 = data->quant;
708    
709          return 0;          return 0;
710  }  }
711    
# Line 586  Line 716 
716  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
717  {  {
718          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
719          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
720    
721          /* Insufficent stats data */          /* Insufficent stats data */
722      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
723          return 0;          return 0;
724    
725      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
726            rc->quant_count[s->type-1][data->quant]++;
727    
728            /* Update the frame type overflow */
729      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
730          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
731    
732                    if(rc->KF_idx != rc->num_frames -1) {
733                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
734                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
735                    }
736    
737                    /* Flush Keyframe overflow accumulator */
738          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
739    
740                    /* Store the frame overflow to the keyframe accumulator */
741          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
742    
743          if (kfdiff > 1) {  /* non-consecutive keyframes */                  if (kfdiff > 1) {
744                            /* Non-consecutive keyframes case:
745                             * We can then divide this total keyframe overflow into equal parts
746                             * that we will distribute into regular overflow at each frame
747                             * between the sequence bounded by two IFrames */
748              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
749          }else{ /* consecutive keyframes */                  } else {
750                            /* Consecutive keyframes case:
751                             * Flush immediatly the keyframe overflow and reset keyframe
752                             * overflow */
753                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
754                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
755                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
756          }          }
757          rc->KF_idx++;          rc->KF_idx++;
758      } else {      } else {
759          /* distribute part of the keyframe overflow */                  /* Accumulate the frame overflow */
760          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
761    
762                    /* Distribute part of the keyframe overflow */
763                    rc->overflow += rc->KFoverflow_partial;
764    
765                    /* Don't forget to substract that same amount from the total keyframe
766                     * overflow */
767          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
768      }      }
769    
770          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;
771            rc->real_total += data->length;
772    
773            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",
774                          data->frame_num,                          data->frame_num,
775                          frame_type[data->type-1],                          frame_type[data->type-1],
776                          data->quant,                          data->quant,
777                          s->length,                          s->length,
778                          s->scaled_length,                          s->scaled_length,
                         data->length,  
779                          s->desired_length,                          s->desired_length,
780                            s->desired_length - s->error,
781                            -s->error,
782                          rc->overflow);                          rc->overflow);
783    
784      return(0);      return(0);
# Line 631  Line 788 
788   * Helper functions definition   * Helper functions definition
789   ****************************************************************************/   ****************************************************************************/
790    
791    /* Default buffer size for reading lines */
792  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
793    
794  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
795    static char *skipspaces(char *string);
796    static int iscomment(char *string);
797    static char *readline(FILE *f);
798    
799    /* This function counts the number of frame entries in the stats file
800     * It also counts the number of I Frames */
801  static int  static int
802  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
803  {  {
804      FILE * f;      FILE * f;
805      int n, ignore;          char *line;
806      char type;          int lines;
807    
808      rc->num_frames = 0;      rc->num_frames = 0;
809      rc->num_keyframes = 0;      rc->num_keyframes = 0;
810    
811      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
812          return 0;                  return(-1);
813    
814      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
815          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
816          if (type == 'i') {  
817              rc->num_frames++;                  char *ptr;
818                    char type;
819                    int fields;
820    
821                    lines++;
822    
823                    /* We skip spaces */
824                    ptr = skipspaces(line);
825    
826                    /* Skip coment lines or empty lines */
827                    if(iscomment(ptr) || *ptr == '\0') {
828                            free(line);
829                            continue;
830                    }
831    
832                    /* Read the stat line from buffer */
833                    fields = sscanf(ptr, "%c", &type);
834    
835                    /* Valid stats files have at least 6 fields */
836                    if (fields == 1) {
837                            switch(type) {
838                            case 'i':
839                            case 'I':
840              rc->num_keyframes++;              rc->num_keyframes++;
841          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
842                            case 'P':
843                            case 'b':
844                            case 'B':
845                            case 's':
846                            case 'S':
847              rc->num_frames++;              rc->num_frames++;
848                                    break;
849                            default:
850                                    DPRINTF(XVID_DEBUG_RC,
851                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
852                                                    lines, type);
853          }          }
854                    } else {
855                                    DPRINTF(XVID_DEBUG_RC,
856                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
857                                                    lines, 6-fields);
858      }      }
859    
860                    /* Free the line buffer */
861                    free(line);
862            }
863    
864            /* We are done with the file */
865      fclose(f);      fclose(f);
866    
867      return 1;          return(0);
868  }  }
869    
870  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
871  static int  static int
872  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
873  {  {
874      FILE * f;      FILE * f;
875      int i, not_scaled;          int processed_entries;
   
876    
877      if ((f = fopen(filename, "rt"))==NULL)          /* Opens the file */
878          return 0;          if ((f = fopen(filename, "rb"))==NULL)
879                    return(-1);
880    
881      i = 0;          processed_entries = 0;
882          not_scaled = 0;          while(processed_entries < rc->num_frames) {
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
883          char type;          char type;
884                    int fields;
885                    twopass_stat_t * s = &rc->stats[processed_entries];
886                    char *line, *ptr;
887    
888                    /* Read the line from the file */
889                    if((line = readline(f)) == NULL)
890                            break;
891    
892                    /* We skip spaces */
893                    ptr = skipspaces(line);
894    
895                    /* Skip comment lines or empty lines */
896                    if(iscomment(ptr) || *ptr == '\0') {
897                            free(line);
898                            continue;
899                    }
900    
901                    /* Reset this field that is optional */
902                  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;  
                 }  
903    
904          if (type == 'i') {                  /* Convert the fields */
905                    fields = sscanf(ptr,
906                                                    "%c %d %d %d %d %d %d\n",
907                                                    &type,
908                                                    &s->quant,
909                                                    &s->blks[0], &s->blks[1], &s->blks[2],
910                                                    &s->length,
911                                                    &s->scaled_length);
912    
913                    /* Free line buffer, we don't need it anymore */
914                    free(line);
915    
916                    /* Fail silently, this has probably been warned in
917                     * statsfile_count_frames */
918                    if(fields != 6 && fields != 7)
919                            continue;
920    
921                    /* Convert frame type */
922                    switch(type) {
923                    case 'i':
924                    case 'I':
925              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
926          }else if (type == 'p' || type == 's') {                          break;
927                    case 'p':
928                    case 'P':
929                    case 's':
930                    case 'S':
931              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
932          }else if (type == 'b') {                          break;
933                    case 'b':
934                    case 'B':
935              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
936          }else{  /* unknown type */                          break;
937              DPRINTF(XVID_DEBUG_RC, "WARNING: unknown stats frame type, assuming pvop\n");                  default:
938              s->type = XVID_TYPE_PVOP;                          /* Same as before, fail silently */
939                            continue;
940          }          }
941    
942          i++;                  /* Ok it seems it's been processed correctly */
943                    processed_entries++;
944      }      }
945    
946      rc->num_frames = i;          /* Close the file */
   
947          fclose(f);          fclose(f);
948    
949      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);  
     }  
950  }  }
 #endif  
951    
952  /* pre-process the statistics data  /* pre-process the statistics data
953      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
954      - set keyframes_locations   * - set keyframes_locations */
 */  
   
955  static void  static void
956  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
957  {  {
958      int i,j;      int i,j;
959    
960          /*          /* *rc fields initialization
          * *rc fields initialization  
961           * 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
962           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
963           for (i=0; i<3; i++) {           for (i=0; i<3; i++) {
964                  rc->count[i]=0;                  rc->count[i]=0;
965                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
# Line 745  Line 968 
968    
969          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
970    
971          /*          /* Loop through all frames and find/compute all the stuff this function
972           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
973          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
974                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
975    
976                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
977                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
# Line 769  Line 990 
990                  }                  }
991          }          }
992    
993          /*          /* NB:
          * Nota Bene:  
994           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
995           * 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
996           * 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
997           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
998      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
999    
1000          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]);
1001          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]);
1002          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]);
1003  }  }
1004    
1005  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1006  static void  static void
1007  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1008  {  {
# Line 836  Line 1054 
1054      }      }
1055      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1056    
1057      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);
1058  }  }
1059    
1060    
1061  /* scale the curve */  /* scale the curve */
   
1062  static void  static void
1063  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1064  {  {
1065          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1066          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t pass1_length;
1067          double scaler;          double scaler;
1068          int i, num_MBs;          int i, num_MBs;
1069    
1070            /* We remove the bytes used by the fixed quantizer zones
1071             * ToDo: this approach is flawed, the same amount of bytes is removed from
1072             *       target and first pass data, this has no sense, zone_process should
1073             *       give us two results one for unscaled data (1pass) and the other
1074             *       one for scaled data and we should then write:
1075             *       target = rc->target - rc->tot_quant_scaled;
1076             *       pass1_length = rc->i+p+b - rc->tot_quant_firstpass */
1077            target = rc->target - rc->tot_quant;
1078    
1079            /* Do the same for the first pass data */
1080            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1081            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1082            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1083            pass1_length -= rc->tot_quant;
1084    
1085          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1086          scaler = (double)target / (double)pass1_length;          scaler = (double)target / (double)pass1_length;
1087    
1088          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1089                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1090          scaler = 1.0;          scaler = 1.0;
1091          }          }
1092    
1093      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1094                          "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
1095                          (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.  
1096           *           *
1097           * We compare these hardcoded values with observed values in first pass           * We compare these hardcoded values with observed values in first pass
1098           * (determined in pre_process0).Then we keep the real minimum.           * (determined in pre_process0).Then we keep the real minimum. */
          */  
         num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];  
   
         if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)  
                 rc->min_length[0] = ((num_MBs*22) + 240) / 8;  
   
         if(rc->min_length[1] > ((num_MBs) + 88)  / 8)  
                 rc->min_length[1] = ((num_MBs) + 88)  / 8;  
1099    
1100          if(rc->min_length[2] > 8)          /* Number of MBs */
1101                  rc->min_length[2] = 8;          num_MBs  = rc->stats[0].blks[0];
1102            num_MBs += rc->stats[0].blks[1];
1103            num_MBs += rc->stats[0].blks[2];
1104    
1105            /* Minimum for I frames */
1106            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1107                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1108    
1109            /* Minimum for P/S frames */
1110            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1111                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1112    
1113            /* Minimum for B frames */
1114            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1115                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1116    
1117          /*          /* Perform an initial scale pass.
1118           * Perform an initial scale pass.           *
1119           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1120           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1121           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1122          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1123                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1124                  int len;                  int len;
1125    
1126                    /* No need to scale frame length for which a specific quantizer is
1127                     * specified thanks to zones */
1128          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1129              s->scaled_length = s->length;              s->scaled_length = s->length;
1130                          continue;                          continue;
# Line 901  Line 1135 
1135    
1136                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1137                  if (len < rc->min_length[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1138                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1139                             * computed minimum */
1140                          s->scaled_length = rc->min_length[s->type-1];                          s->scaled_length = rc->min_length[s->type-1];
1141    
1142                            /* Remove both scaled and original size from their respective
1143                             * total counters, as we prepare a second pass for 'regular'
1144                             * frames */
1145                          target -= s->scaled_length;                          target -= s->scaled_length;
1146                          pass1_length -= s->length;                          pass1_length -= s->length;
1147                  } else {                  } else {
# Line 911  Line 1150 
1150                  }                  }
1151          }          }
1152    
1153          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1154             * total counters. Now, it's possible to scale the 'regular' frames. */
1155    
1156            /* Scaling factor for 'regular' frames */
1157          scaler = (double)target / (double)pass1_length;          scaler = (double)target / (double)pass1_length;
1158    
1159          /* Detect undersizing */          /* Detect undersizing */
1160      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1161                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1162                  scaler = 1.0;                  scaler = 1.0;
1163          }          }
1164    
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
   
1165          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1166          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1167                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1168    
1169                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1170                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1171                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
1172          }          }
1173    
1174            /* Job done */
1175            return;
1176  }  }
1177    
1178    /* Apply all user settings to the scaled curve
1179     * This implies:
1180     *   keyframe boosting
1181     *   high/low compression */
1182  static void  static void
1183  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1184  {  {
1185      int i;      int i;
1186      double total1, total2;          int64_t ivop_boost_total;
     uint64_t ivop_boost_total;  
1187    
1188      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1189      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1190    
1191      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1192          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1193                    twopass_stat_t *s = &rc->stats[i];
1194                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1195      }      }
1196    
1197            /* First we compute the total amount of bits needed, as being described by
1198             * the scaled distribution. During this pass over the complete stats data,
1199             * we see how much bits two user settings will get/give from/to p&b frames:
1200             *  - keyframe boosting
1201             *  - keyframe distance penalty */
1202            rc->KF_idx = 0;
1203            ivop_boost_total = 0;
1204      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1205          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1206    
1207                    /* Some more work is needed for I frames */
1208          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1209              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1210    
1211                            /* Accumulate bytes needed for keyframe boosting */
1212                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1213    
1214    #if 0 /* ToDo: decide how to apply kfthresholding */
1215    #endif
1216                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1217                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1218                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1219    
1220                            /* Accumulate the ivop boost */
1221                            ivop_boost_total += ivop_boost;
1222    
1223                            /* Don't forget to update the keyframe index */
1224                            rc->KF_idx++;
1225          }          }
1226      }      }
1227    
1228      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
1229                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1230             * This ratio has to be applied to p/b/s frames in order to reserve
1231             * additional bits for keyframes (keyframe boosting) or if too much
1232             * keyframe distance is applied, bits retrieved from the keyframes.
1233             *
1234             * ie pb_length *= rc->pb_iboost_tax_ratio;
1235             *
1236             *    gives the ideal length of a p/b frame */
1237    
1238            /* Compute the total length of p/b/s frames (temporary storage into
1239             * movie_curve) */
1240            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1241            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1242    
1243            /* Compute the ratio described above
1244             *     taxed_total = sum(0, n, tax*scaled_length)
1245             * <=> taxed_total = tax.sum(0, n, scaled_length)
1246             * <=> tax = taxed_total / original_total */
1247            rc->pb_iboost_tax_ratio =
1248                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1249                    rc->pb_iboost_tax_ratio;
1250    
1251            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1252                            rc->pb_iboost_tax_ratio);
1253    
1254            /* Compute the average size of frames per frame type */
1255      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1256          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1257                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1258              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1259          }else{          }else{
1260              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1261          }  
1262                            if (i == (XVID_TYPE_IVOP-1)) {
1263                                    /* I Frames total has to be added the boost total */
1264                                    rc->avg_length[i] += ivop_boost_total;
1265                            } else {
1266                                    /* P/B frames has to taxed */
1267                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1268      }      }
1269    
1270      /* --- */                          /* Finally compute the average frame size */
1271                            rc->avg_length[i] /= (double)rc->count[i];
1272                    }
1273            }
1274    
1275      total1=total2=0;          /* Assymetric curve compression */
1276            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1277                    double symetric_total;
1278                    double assymetric_delta_total;
1279    
1280                    /* Like I frame boosting, assymetric curve compression modifies the total
1281                     * amount of needed bits, we must compute the ratio so we can prescale
1282                     lengths */
1283                    symetric_total = 0;
1284                    assymetric_delta_total = 0;
1285      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1286          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1287                            double dbytes;
1288                            twopass_stat_t * s = &rc->stats[i];
1289    
1290          if (s->type != XVID_TYPE_IVOP) {                          /* I Frames are not concerned by assymetric scaling */
1291              double dbytes,dbytes2;                          if (s->type == XVID_TYPE_IVOP)
1292                                    continue;
1293    
1294                            /* During the real run, we would have to apply the iboost tax */
1295                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1296    
1297              dbytes = s->scaled_length / rc->movie_curve;                          /* Update the symmetric curve compression total */
1298              dbytes2 = 0; /* XXX: warning */                          symetric_total += dbytes;
             total1 += dbytes;  
1299    
1300                          if (dbytes > rc->avg_length[s->type-1]) {                          /* Apply assymetric curve compression */
1301                                  dbytes2=((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          if (dbytes > rc->avg_length[s->type-1])
1302                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1303                            else
1304                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1305    
1306                            /* Cap to the minimum frame size if needed */
1307                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1308                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1309    
1310                            /* Accumulate after assymetric curve compression */
1311                            assymetric_delta_total += assymetric_delta;
1312                    }
1313    
1314                    /* Compute the tax that all p/b frames have to pay in order to respect the
1315                     * bit distribution changes that the assymetric compression curve imposes
1316                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1317                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1318                     *         ratio = assymetric_total / symmetric_total */
1319                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1320                          } else {                          } else {
1321                                  dbytes2 = ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1322            }
1323    
1324            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1325    
1326            /* Last bits that need to be reset */
1327            rc->overflow = 0;
1328            rc->KFoverflow = 0;
1329            rc->KFoverflow_partial = 0;
1330            rc->KF_idx = 0;
1331            rc->desired_total = 0;
1332            rc->real_total = 0;
1333    
1334            /* Job done */
1335            return;
1336                          }                          }
1337    
1338                          if (dbytes2 < rc->min_length[s->type-1])  /*****************************************************************************
1339                                      dbytes2 = rc->min_length[s->type-1];   * Still more low level stuff (nothing to do with stats treatment)
1340     ****************************************************************************/
1341    
1342    /* This function returns an allocated string containing a complete line read
1343     * from the file starting at the current position */
1344    static char *
1345    readline(FILE *f)
1346    {
1347            char *buffer = NULL;
1348            int buffer_size = 0;
1349            int pos = 0;
1350    
1351            do {
1352                    int c;
1353    
1354                    /* Read a character from the stream */
1355                    c = fgetc(f);
1356    
1357                    /* Is that EOF or new line ? */
1358                    if(c == EOF || c == '\n')
1359                            break;
1360    
1361              total2 += dbytes2;                  /* Do we have to update buffer ? */
1362                    if(pos >= buffer_size - 1) {
1363                            buffer_size += BUF_SZ;
1364                            buffer = (char*)realloc(buffer, buffer_size);
1365                            if (buffer == NULL)
1366                                    return(NULL);
1367          }          }
1368    
1369                    buffer[pos] = c;
1370                    pos++;
1371            } while(1);
1372    
1373            /* Read \n or EOF */
1374            if (buffer == NULL) {
1375                    /* EOF, so we reached the end of the file, return NULL */
1376                    if(feof(f))
1377                            return(NULL);
1378    
1379                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1380                     * store a zero length string */
1381                    buffer = (char*)malloc(1);
1382                    if(buffer == NULL)
1383                            return(NULL);
1384      }      }
1385    
1386      rc->curve_comp_scale = total1 / total2;          /* Zero terminated string */
1387            buffer[pos] = '\0';
1388    
1389          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: pframe%d bframe:%d\n",          return(buffer);
1390              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale),  }
                         (int)(rc->avg_length[XVID_TYPE_BVOP-1] * rc->curve_comp_scale));  
1391    
1392      rc->overflow = 0;  /* This function returns a pointer to the first non space char in the given
1393      rc->KFoverflow = 0;   * string */
1394      rc->KFoverflow_partial = 0;  static char *
1395      rc->KF_idx = 1;  skipspaces(char *string)
1396    {
1397            const char spaces[] =
1398                    {
1399                            ' ','\t','\0'
1400                    };
1401            const char *spacechar = spaces;
1402    
1403            if (string == NULL) return(NULL);
1404    
1405            while (*string != '\0') {
1406                    /* Test against space chars */
1407                    while (*spacechar != '\0') {
1408                            if (*string == *spacechar) {
1409                                    string++;
1410                                    spacechar = spaces;
1411                                    break;
1412                            }
1413                            spacechar++;
1414                    }
1415    
1416                    /* No space char */
1417                    if (*spacechar == '\0') return(string);
1418            }
1419    
1420            return(string);
1421    }
1422    
1423    /* This function returns a boolean that tells if the string is only a
1424     * comment */
1425    static int
1426    iscomment(char *string)
1427    {
1428            const char comments[] =
1429                    {
1430                            '#',';', '%', '\0'
1431                    };
1432            const char *cmtchar = comments;
1433            int iscomment = 0;
1434    
1435            if (string == NULL) return(1);
1436    
1437            string = skipspaces(string);
1438    
1439            while(*cmtchar != '\0') {
1440                    if(*string == *cmtchar) {
1441                            iscomment = 1;
1442                            break;
1443  }  }
1444                    cmtchar++;
1445            }
1446    
1447            return(iscomment);
1448    }
1449    
1450    #if 0
1451    static void
1452    stats_print(rc_2pass2_t * rc)
1453    {
1454            int i;
1455            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1456    
1457            for (i=0; i<rc->num_frames; i++) {
1458                    twopass_stat_t *s = &rc->stats[i];
1459                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1460                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1461                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1462            }
1463    }
1464    #endif
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