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revision 1040, Thu May 22 22:17:44 2003 UTC revision 1063, Tue Jun 10 10:12:24 2003 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C)      2002 Foxer <email?>   * Copyright (C)      2002 Foxer <email?>
7   *                    2002 Dirk Knop <dknop@gwdg.de>   *                    2002 Dirk Knop <dknop@gwdg.de>
# 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 1.1.2.9 2003-05-22 22:17:44 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.21 2003-06-10 10:12:24 suxen_drol Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
# Line 33  Line 33 
33  #include <math.h>  #include <math.h>
34  #include <limits.h>  #include <limits.h>
35    
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
   
36  #include "../xvid.h"  #include "../xvid.h"
37  #include "../image/image.h"  #include "../image/image.h"
38    
39    /*****************************************************************************
40     * Some constants
41     ****************************************************************************/
42    
43    #define DEFAULT_KEYFRAME_BOOST 0
44    #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP
45    #define DEFAULT_BITRATE_PAYBACK_DELAY 250
46    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
47    #define DEFAULT_CURVE_COMPRESSION_LOW 0
48    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60
49    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60
50    
51    /* Keyframe settings */
52    #define DEFAULT_KFTRESHOLD 10
53    #define DEFAULT_KFREDUCTION 20
54    #define DEFAULT_MIN_KEY_INTERVAL 1
55    
56    /*****************************************************************************
57     * Structures
58     ****************************************************************************/
59    
60    /* Statistics */
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 */
# Line 51  Line 70 
70      double weight;      double weight;
71  } stat_t;  } stat_t;
72    
73    /* Context struct */
   
   
 /* context struct */  
74  typedef struct  typedef struct
75  {  {
76      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
# Line 79  Line 95 
95      double curve_comp_scale;      double curve_comp_scale;
96      double movie_curve;      double movie_curve;
97    
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
   
98      /* dynamic */      /* dynamic */
99    
100      int * keyframe_locations;      int * keyframe_locations;
101      stat_t * stats;      stat_t * stats;
102    
103      double pquant_error[32];          double quant_error[3][32];
     double bquant_error[32];  
104      int quant_count[32];      int quant_count[32];
105      int last_quant[3];      int last_quant[3];
106    
# Line 107  Line 114 
114  } rc_2pass2_t;  } rc_2pass2_t;
115    
116    
117    /*****************************************************************************
118     * Sub plugin functions prototypes
119     ****************************************************************************/
120    
121    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
122    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
123    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
124    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
125    
126    /*****************************************************************************
127     * Plugin definition
128     ****************************************************************************/
129    
130  #define BUF_SZ 1024  int
131  #define MAX_COLS    5  xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
   
   
 /* open stats file, and count num frames */  
   
 static int det_stats_length(rc_2pass2_t * rc, char * filename)  
132  {  {
133      FILE * f;      switch(opt) {
134      int n, ignore;      case XVID_PLG_INFO :
     char type;  
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
135          return 0;          return 0;
136    
137      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",      case XVID_PLG_CREATE :
138          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
         if (type == 'i') {  
             rc->num_frames++;  
             rc->num_keyframes++;  
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
         }  
     }  
139    
140      fclose(f);      case XVID_PLG_DESTROY :
141            return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
142    
143      return 1;      case XVID_PLG_BEFORE :
144            return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
145    
146        case XVID_PLG_AFTER :
147            return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
148  }  }
149    
150        return XVID_ERR_FAIL;
151    }
152    
153    /*****************************************************************************
154     * Sub plugin functions definitions
155     ****************************************************************************/
156    
157    /* First a few local helping function prototypes */
158    static  int det_stats_length(rc_2pass2_t * rc, char * filename);
159    static  int load_stats(rc_2pass2_t *rc, char * filename);
160    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
161    static void internal_scale(rc_2pass2_t *rc);
162    static void pre_process0(rc_2pass2_t * rc);
163    static void pre_process1(rc_2pass2_t * rc);
164    
165  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
166     *--------------------------------------------------------------------------*/
167    
168  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
169    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
170  {  {
171      FILE * f;      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
172      int i, not_scaled;      rc_2pass2_t * rc;
173        int i;
174    
175        rc = malloc(sizeof(rc_2pass2_t));
176        if (rc == NULL)
177            return XVID_ERR_MEMORY;
178    
179      if ((f = fopen(filename, "rt"))==NULL)      rc->param = *param;
         return 0;  
180    
181      i = 0;          /*
182          not_scaled = 0;           * Initialize all defaults
183      while(i < rc->num_frames) {           */
184          stat_t * s = &rc->stats[i];  #define _INIT(a, b) if((a) <= 0) (a) = (b)
185          int n;      /* Let's set our defaults if needed */
186          char type;          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
187            _INIT(rc->param.payback_method, DEFAULT_PAYBACK_METHOD);
188            _INIT(rc->param.bitrate_payback_delay, DEFAULT_BITRATE_PAYBACK_DELAY);
189        _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
190        _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
191        _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
192        _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
193    
194        /* Keyframe settings */
195            _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);
196        _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
197        _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);
198    #undef _INIT
199    
200                  s->scaled_length = 0;          /* Initialize some stuff to zero */
201          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);          for(i=0; i<32; i++) rc->quant_count[i] = 0;
202          if (n == EOF) break;  
203                  if (n < 7) {          for(i=0; i<3; i++) {
204                          not_scaled = 1;                  int j;
205                    for (j=0; j<32; j++)
206                            rc->quant_error[i][j] = 0;
207                  }                  }
208    
209          if (type == 'i') {          for (i=0; i<3; i++)
210              s->type = XVID_TYPE_IVOP;                  rc->last_quant[i] = 0;
211          }else if (type == 'p' || type == 's') {  
212              s->type = XVID_TYPE_PVOP;          rc->fq_error = 0;
213          }else if (type == 'b') {  
214              s->type = XVID_TYPE_BVOP;          /* Count frames in the stats file */
215          }else{  /* unknown type */          if (!det_stats_length(rc, param->filename)) {
216              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);
217              s->type = XVID_TYPE_PVOP;                  free(rc);
218                    return XVID_ERR_FAIL;
219          }          }
220    
221          i++;      /* Allocate the stats' memory */
222            if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {
223            free(rc);
224            return XVID_ERR_MEMORY;
225      }      }
226    
227      rc->num_frames = i;      /*
228             * Allocate keyframes location's memory
229             * PS: see comment in pre_process0 for the +1 location requirement
230             */
231            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
232            if (rc->keyframe_locations == NULL) {
233                    free(rc->stats);
234                    free(rc);
235                    return XVID_ERR_MEMORY;
236            }
237    
238          fclose(f);          if (!load_stats(rc, param->filename)) {
239                    DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);
240                    free(rc->keyframe_locations);
241                    free(rc->stats);
242                    free(rc);
243                    return XVID_ERR_FAIL;
244            }
245    
246      return 1;          /* Compute the target filesize */
247        if (rc->param.bitrate<0) {
248            /* if negative, bitrate equals the target (int kbytes) */
249            rc->target = (-rc->param.bitrate) * 1024;
250    
251        }else if (rc->num_frames  < create->fbase/create->fincr) {
252                    /* Source sequence is less than 1s long, we do as if it was 1s long */
253                    rc->target = rc->param.bitrate / 8;
254            } else {
255                    /* Target filesize = bitrate/8 * numframes / framerate */
256                    rc->target =
257                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
258                             (uint64_t)create->fincr) / \
259                            ((uint64_t)create->fbase * 8);
260  }  }
261    
262            DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",
263                            create->fbase, create->fincr,
264                            (double)create->fbase/(double)create->fincr);
265            DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);
266            DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);
267            DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);
268    
269            /* Compensate the average frame overhead caused by the container */
270            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
271            DPRINTF(XVID_DEBUG_RC, "Container Frame overhead: %d\n", rc->param.container_frame_overhead);
272            DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);
273    
274            /*
275             * First data pre processing:
276             *  - finds the minimum frame length for each frame type during 1st pass.
277             *     rc->min_size[]
278             *  - determines the maximum frame length observed (no frame type distinction).
279             *     rc->max_size
280             *  - count how many times each frame type has been used.
281             *     rc->count[]
282             *  - total bytes used per frame type
283             *     rc->total[]
284             *  - store keyframe location
285             *     rc->keyframe_locations[]
286             */
287            pre_process0(rc);
288    
289  #if 0          /*
290  static void print_stats(rc_2pass2_t * rc)           * When bitrate is not given it means it has been scaled by an external
291  {           * application
292      int i;           */
293      DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");          if (rc->param.bitrate) {
294                    /* Apply zone settings */
295                    zone_process(rc, create);
296                    /* Perform curve scaling */
297                    internal_scale(rc);
298            } else {
299                    /* External scaling -- zones are ignored */
300          for (i = 0; i < rc->num_frames; i++) {          for (i = 0; i < rc->num_frames; i++) {
301          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
302          DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
303      }      }
304                    rc->avg_weight = 1.0;
305                    rc->tot_quant = 0;
306  }  }
 #endif  
   
 /* pre-process the statistics data  
     - for each type, count, tot_length, min_length, max_length  
     - set keyframes_locations  
 */  
307    
308  static void          pre_process1(rc);
 pre_process0(rc_2pass2_t * rc)  
 {  
     int i,j;  
309    
310      for (i=0; i<3; i++) {          *handle = rc;
311          rc->count[i]=0;          return(0);
         rc->tot_length[i] = 0;  
         rc->last_quant[i] = 0;  
                 rc->min_length[i] = INT_MAX;  
312      }      }
313    
314          rc->max_length = INT_MIN;  /*----------------------------------------------------------------------------
315     *--------------------------------------------------------------------------*/
     for (i=j=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
   
         rc->count[s->type-1]++;  
         rc->tot_length[s->type-1] += s->length;  
316    
317          if (s->length < rc->min_length[s->type-1]) {  static int
318              rc->min_length[s->type-1] = s->length;  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
319    {
320        free(rc->keyframe_locations);
321        free(rc->stats);
322            free(rc);
323            return(0);
324          }          }
325    
326          if (s->length > rc->max_length) {  /*----------------------------------------------------------------------------
327              rc->max_length = s->length;   *--------------------------------------------------------------------------*/
         }  
328    
329          if (s->type == XVID_TYPE_IVOP) {  static int
330              rc->keyframe_locations[j] = i;  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
331              j++;  {
332          }          stat_t * s = &rc->stats[data->frame_num];
333      }          int overflow;
334            int desired;
335            double dbytes;
336            double curve_temp;
337            double scaled_quant;
338            int capped_to_max_framesize = 0;
339    
340          /*          /*
341           * The "per sequence" overflow system considers a natural sequence to be           * This function is quite long but easy to understand. In order to simplify
342           * formed by all frames between two iframes, so if we want to make sure           * the code path (a bit), we treat 3 cases that can return immediatly.
          * the system does not go nuts during last sequence, we force the last  
          * frame to appear in the keyframe locations array.  
343           */           */
     rc->keyframe_locations[j] = i;  
344    
345          DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);          /* First case: Another plugin has already set a quantizer */
346          DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);      if (data->quant > 0)
347          DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);                  return(0);
348    
349            /* Second case: We are in a Quant zone */
350            if (s->zone_mode == XVID_ZONE_QUANT) {
351                    rc->fq_error += s->weight;
352                    data->quant = (int)rc->fq_error;
353                    rc->fq_error -= data->quant;
354    
355                    s->desired_length = s->length;
356    
357                    return(0);
358  }  }
359    
360            /* Third case: insufficent stats data */
361            if (data->frame_num >= rc->num_frames)
362                    return 0;
363    
364  /* calculate zone weight "center" */          /* XXX: why by 8 */
365            overflow = rc->overflow / 8;
366    
367  static void          /*
368  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)           * The rc->overflow field represents the overflow in current scene (between two
369  {           * IFrames) so we must not forget to reset it if we are entering a new scene
370      int i,j;           */
371      int n = 0;          if (s->type == XVID_TYPE_IVOP)
372                    overflow = 0;
373    
374      rc->avg_weight = 0.0;          desired = s->scaled_length;
     rc->tot_quant = 0;  
375    
376            dbytes = desired;
377            if (s->type == XVID_TYPE_IVOP)
378                    dbytes += desired * rc->param.keyframe_boost / 100;
379            dbytes /= rc->movie_curve;
380    
381      if (create->num_zones == 0) {          /*
382          for (j = 0; j < rc->num_frames; j++) {           * Apply user's choosen Payback method. Payback helps bitrate to follow the
383              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;           * scaled curve "paying back" past errors in curve previsions.
384              rc->stats[j].weight = 1.0;           */
385          }          if (rc->param.payback_method == XVID_PAYBACK_BIAS) {
386          rc->avg_weight += rc->num_frames * 1.0;                  desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);
387          n += rc->num_frames;          } else {
388                    desired = (int)(rc->curve_comp_error * dbytes /
389                                                    rc->avg_length[s->type-1] / rc->param.bitrate_payback_delay);
390    
391                    if (labs(desired) > fabs(rc->curve_comp_error))
392                            desired = (int)rc->curve_comp_error;
393      }      }
394    
395            rc->curve_comp_error -= desired;
396    
397      for(i=0; i < create->num_zones; i++) {          /* XXX: warning */
398            curve_temp = 0;
399    
400          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {
401    
402          if (i==0 && create->zones[i].frame > 0) {                  curve_temp = rc->curve_comp_scale;
403              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {                  if (dbytes > rc->avg_length[s->type-1]) {
404                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                          curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);
405                  rc->stats[j].weight = 1.0;                  } else {
406                            curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
407              }              }
408              rc->avg_weight += create->zones[i].frame * 1.0;  
409              n += create->zones[i].frame;                  desired += (int)curve_temp;
410                    rc->curve_comp_error += curve_temp - (int)curve_temp;
411            } else {
412                    desired += (int)dbytes;
413                    rc->curve_comp_error += dbytes - (int)dbytes;
414          }          }
415    
         if (create->zones[i].mode == XVID_ZONE_WEIGHT) {  
             for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
                 rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
                 rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
             }  
             next -= create->zones[i].frame;  
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
             n += next;  
         }else{  // XVID_ZONE_QUANT  
             for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
                 rc->stats[j].zone_mode = XVID_ZONE_QUANT;  
                 rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
                 rc->tot_quant += rc->stats[j].length;  
             }  
         }  
     }  
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
   
     DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);  
 }  
   
   
 /* scale the curve */  
   
 static void  
 internal_scale(rc_2pass2_t *rc)  
 {  
         int64_t target  = rc->target - rc->tot_quant;  
         int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
         int min_size[3];  
         double scaler;  
         int i;  
   
416    
417          /*          /*
418           * Perform an initial scale pass.           * We can't do bigger frames than first pass, this would be stupid as first
419           * if a frame size is scaled underneath our hardcoded minimums, then we           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose
420           * force the frame size to the minimum, and deduct the original & scaled           * many bytes and we would not not gain much quality.
          * frame length from the original and target total lengths  
421           */           */
422            if (desired > s->length) {
423          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;                  rc->curve_comp_error += desired - s->length;
424          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;                  desired = s->length;
         min_size[2] = 8;  
   
         scaler = (double)target / (double)pass1_length;  
   
         if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  
                 DPRINTF(XVID_DEBUG_RC, "undersize warning\n");  
         scaler = 1.0;  
         }  
   
     DPRINTF(XVID_DEBUG_RC,  
                         "Before any correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
   
         for (i=0; i<rc->num_frames; i++) {  
                 stat_t * s = &rc->stats[i];  
                 int len;  
   
         if (s->zone_mode == XVID_ZONE_QUANT) {  
             s->scaled_length = s->length;  
         }else {  
                     len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);  
                     if (len < min_size[s->type-1]) {            /* force frame size */  
                             s->scaled_length = min_size[s->type-1];  
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
425                      }else{                      }else{
426                              s->scaled_length = 0;                  if (desired < rc->min_length[s->type-1]) {
                     }  
         }  
         }  
   
     scaler = (double)target / (double)pass1_length;  
     if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  
                 DPRINTF(XVID_DEBUG_RC,"undersize warning\n");  
                 scaler = 1.0;  
         }  
   
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
   
         for (i=0; i<rc->num_frames; i++) {  
                 stat_t * s = &rc->stats[i];  
   
                 if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */  
                         s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);  
                 }  
         }  
 }  
   
   
   
   
 static void  
 pre_process1(rc_2pass2_t * rc)  
 {  
     int i;  
     double total1, total2;  
     uint64_t ivop_boost_total;  
   
     ivop_boost_total = 0;  
     rc->curve_comp_error = 0;  
   
     for (i=0; i<3; i++) {  
         rc->tot_scaled_length[i] = 0;  
     }  
   
     for (i=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
   
427          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
428              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;
         }  
429      }      }
430                            desired = rc->min_length[s->type-1];
     rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /  
                                         (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));  
   
     for(i=0; i<3; i++) {  
         if (rc->count[i] == 0 || rc->movie_curve == 0) {  
             rc->avg_length[i] = 1;  
         }else{  
             rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;  
431          }          }
432      }      }
433    
434      /* alt curve stuff here */          s->desired_length = desired;
   
     if (rc->param.use_alt_curve) {  
         const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];  
         const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];  
   
                 rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  
                 rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;  
                 rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
   
         if (rc->param.alt_curve_use_auto) {  
             if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {  
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /  
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
435    
436                                  if (rc->param.alt_curve_min_rel_qual < 20)          /*
437                                          rc->param.alt_curve_min_rel_qual = 20;           * if this keyframe is too close to the next, reduce it's byte allotment
438              }else{           * XXX: why do we do this after setting the desired length ?
439                                  rc->param.alt_curve_min_rel_qual = 100;           */
             }  
         }  
                 rc->alt_curve_mid_qual = (1.0 + (double)rc->param.alt_curve_min_rel_qual / 100.0) / 2.0;  
                 rc->alt_curve_qual_dev = 1.0 - rc->alt_curve_mid_qual;  
440    
441          if (rc->param.alt_curve_low_dist > 100) {          if (s->type == XVID_TYPE_IVOP) {
442                          switch(rc->param.alt_curve_type) {                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];
             case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
                                 break;  
                         case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                         }  
                 }  
     }  
     /* --- */  
443    
444                    if (KFdistance < rc->param.kftreshold) {
445    
446      total1=total2=0;                          KFdistance -= rc->param.min_key_interval;
     for (i=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
447    
448          if (s->type != XVID_TYPE_IVOP) {                          if (KFdistance >= 0) {
449              double dbytes,dbytes2;                                  int KF_min_size;
450    
451              dbytes = s->scaled_length / rc->movie_curve;                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;
452              dbytes2 = 0; /* XXX: warning */                                  if (KF_min_size < 1)
453              total1 += dbytes;                                          KF_min_size = 1;
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
454    
455              if (rc->param.use_alt_curve) {                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /
456                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                                          (rc->param.kftreshold - rc->param.min_key_interval);
457    
458                      if (dbytes >= rc->alt_curve_high) {                                  if (desired < 1)
459                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                                          desired = 1;
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                         case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                         case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
460                                          }                                          }
                 }else{  
                     if (dbytes <= rc->alt_curve_low) {  
                                                 dbytes2 = dbytes;  
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
461                                                  }                                                  }
462                                          }                                          }
463    
464                  }          /*
465             * The "sens commun" would force us to use rc->avg_length[s->type-1] but
466             * even VFW code uses the pframe average length. Note that this length is
467             * used with desired which represents bframes _and_ pframes length.
468             *
469             * XXX: why are we using the avg pframe length for all frame types ?
470             */
471            overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);
472    
473            /* Reign in overflow with huge frames */
474            if (labs(overflow) > labs(rc->overflow))
475                    overflow = rc->overflow;
476    
477            /* Make sure overflow doesn't run away */
478            if (overflow > desired * rc->param.max_overflow_improvement / 100) {
479                    desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :
480                            overflow * rc->param.max_overflow_improvement / 100;
481            } else if (overflow < desired * rc->param.max_overflow_degradation / -100){
482                    desired += desired * rc->param.max_overflow_degradation / -100;
483              }else{              }else{
484                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  desired += overflow;
                     dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
                 }else{  
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
485              }              }
486    
487              if (s->type == XVID_TYPE_BVOP) {          /* Make sure we are not higher than desired frame size */
488                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          if (desired > rc->max_length) {
489                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])                  capped_to_max_framesize = 1;
490                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                  desired = rc->max_length;
491              }else{                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",
492                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                                  data->frame_num);
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
             }  
             total2 += dbytes2;  
         }  
493      }      }
494    
495      rc->curve_comp_scale = total1 / total2;          /* Make sure to not scale below the minimum framesize */
496            if (desired < rc->min_length[s->type-1]) {
497      if (!rc->param.use_alt_curve) {                  desired = rc->min_length[s->type-1];
498          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",
499              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));                                  data->frame_num);
500      }      }
501    
502      if (rc->param.use_alt_curve) {          /*
503          int bonus_bias = rc->param.alt_curve_bonus_bias;           * Don't laugh at this very 'simple' quant<->filesize relationship, it
504          int oldquant = 1;           * proves to be acurate enough for our algorithm
505             */
506              if (rc->param.alt_curve_use_auto_bonus_bias)          scaled_quant = (double)s->quant*(double)s->length/(double)desired;
                     bonus_bias = rc->param.alt_curve_min_rel_qual;  
   
             rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);  
             rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;  
   
   
         /* special info for alt curve:  bias bonus and quantizer thresholds */  
507    
508                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i\n", (int)rc->avg_length[XVID_TYPE_PVOP-1]);          /*
509                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes\n", (int)rc->alt_curve_curve_bias_bonus);           * Quantizer has been scaled using floating point operations/results, we
510             * must cast it to integer
511             */
512            data->quant = (int)scaled_quant;
513    
514                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {          /* Let's clip the computed quantizer, if needed */
515              double curve_temp, dbytes;          if (data->quant < 1) {
516              int newquant;                  data->quant = 1;
517            } else if (data->quant > 31) {
518                    data->quant = 31;
519            } else if (s->type != XVID_TYPE_IVOP) {
520    
521              dbytes = i;                  /*
522                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * The frame quantizer has not been clipped, this appears to be a good
523                  if (dbytes >= rc->alt_curve_high) {                   * computed quantizer, do not loose quantizer decimal part that we
524                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                   * accumulate for later reuse when its sum represents a complete unit.
525                  }else{                   */
526                                          switch(rc->param.alt_curve_type)                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
                                         {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
                         }else{  
                 if (dbytes <= rc->alt_curve_low) {  
                                         curve_temp = dbytes;  
                 }else{  
                                         switch(rc->param.alt_curve_type)  
                                         {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
                                 }  
                         }  
527    
528                          if (rc->movie_curve > 1.0)                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
529                                  dbytes *= rc->movie_curve;                          rc->quant_error[s->type-1][data->quant] -= 1.0;
530                            data->quant++;
531                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
532                          if (newquant > 1) {                          rc->quant_error[s->type-1][data->quant] += 1.0;
533                                  if (newquant != oldquant) {                          data->quant--;
                     int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);  
                                         oldquant = newquant;  
                                         DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent\n", newquant, i, percent);  
                                 }  
                         }  
534                  }                  }
535    
536      }      }
537    
538      rc->overflow = 0;          /*
539      rc->KFoverflow = 0;           * Now we have a computed quant that is in the right quante range, with a
540      rc->KFoverflow_partial = 0;           * possible +1 correction due to cumulated error. We can now safely clip
541      rc->KF_idx = 1;           * the quantizer again with user's quant ranges. "Safely" means the Rate
542             * Control could learn more about this quantizer, this knowledge is useful
543             * for future frames even if it this quantizer won't be really used atm,
544             * that's why we don't perform this clipping earlier.
545             */
546            if (data->quant < data->min_quant[s->type-1]) {
547                    data->quant = data->min_quant[s->type-1];
548            } else if (data->quant > data->max_quant[s->type-1]) {
549                    data->quant = data->max_quant[s->type-1];
550  }  }
551    
552            /*
553             * To avoid big quality jumps from frame to frame, we apply a "security"
554             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
555             * to predicted frames (P and B)
556             */
557            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
558    
559                    if (data->quant > rc->last_quant[s->type-1] + 2) {
560                            data->quant = rc->last_quant[s->type-1] + 2;
561  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                          DPRINTF(XVID_DEBUG_RC,
562  {                                          "[%i] p/b-frame quantizer prevented from rising too steeply\n",
563      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;                                          data->frame_num);
564      rc_2pass2_t * rc;                  }
565      int i;                  if (data->quant < rc->last_quant[s->type-1] - 2) {
566                            data->quant = rc->last_quant[s->type-1] - 2;
567      rc = malloc(sizeof(rc_2pass2_t));                          DPRINTF(XVID_DEBUG_RC,
568      if (rc == NULL)                                          "[%i] p/b-frame quantizer prevented from falling too steeply\n",
569          return XVID_ERR_MEMORY;                                          data->frame_num);
   
     rc->param = *param;  
   
     if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;  
     if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;  
     if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;  
     if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;  
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
   
     if (rc->param.use_alt_curve <= 0) rc->param.use_alt_curve = 0;  
     if (rc->param.alt_curve_high_dist <= 0) rc->param.alt_curve_high_dist = 500;  
     if (rc->param.alt_curve_low_dist <= 0) rc->param.alt_curve_low_dist = 90;  
     if (rc->param.alt_curve_use_auto <= 0) rc->param.alt_curve_use_auto = 1;  
     if (rc->param.alt_curve_auto_str <= 0) rc->param.alt_curve_auto_str = 30;  
     if (rc->param.alt_curve_type <= 0) rc->param.alt_curve_type = XVID_CURVE_LINEAR;  
     if (rc->param.alt_curve_min_rel_qual <= 0) rc->param.alt_curve_min_rel_qual = 50;  
     if (rc->param.alt_curve_use_auto_bonus_bias <= 0) rc->param.alt_curve_use_auto_bonus_bias = 1;  
     if (rc->param.alt_curve_bonus_bias <= 0) rc->param.alt_curve_bonus_bias = 50;  
   
     if (rc->param.kftreshold <= 0) rc->param.kftreshold = 10;  
     if (rc->param.kfreduction <= 0) rc->param.kfreduction = 20;  
     if (rc->param.min_key_interval <= 0) rc->param.min_key_interval = 300;  
   
     if (!det_stats_length(rc, param->filename)){  
         DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);  
         free(rc);  
         return XVID_ERR_FAIL;  
570      }      }
   
     if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {  
         free(rc);  
         return XVID_ERR_MEMORY;  
571      }      }
572    
573      /*      /*
574           * We need an extra location because we do as if the last frame were an           * We don't want to pollute the RC history results when our computed quant
575           * IFrame. This is needed because our code consider that frames between           * has been computed from a capped frame size
          * 2 IFrames form a natural sequence. So we store last frame as a  
          * keyframe location.  
576           */           */
577      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {          if (capped_to_max_framesize == 0)
578          free(rc->stats);                  rc->last_quant[s->type-1] = data->quant;
         free(rc);  
         return XVID_ERR_MEMORY;  
     }  
   
     if (!load_stats(rc, param->filename)) {  
         DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);  
         free(rc->keyframe_locations);  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_FAIL;  
     }  
579    
580      /* pre-process our stats */          /* Force frame type */
581            data->type = s->type;
582    
583          if (rc->num_frames  < create->fbase/create->fincr) {          return 0;
                 rc->target = rc->param.bitrate / 8;     /* one second */  
         }else{  
                 rc->target =  
                         ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * (uint64_t)create->fincr) / \  
                         ((uint64_t)create->fbase * 8);  
584          }          }
585    
586      DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);  /*----------------------------------------------------------------------------
587          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d\n", create->fbase, create->fincr);   *--------------------------------------------------------------------------*/
         DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);  
         DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);  
   
 #if 0  
         rc->target -= rc->num_frames*24;        /* avi file header */  
 #endif  
588    
589    static int
590    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
591    {
592            const char frame_type[4] = { 'i', 'p', 'b', 's'};
593            stat_t * s = &rc->stats[data->frame_num];
594    
595          pre_process0(rc);          /* Insufficent stats data */
596        if (data->frame_num >= rc->num_frames)
597            return 0;
598    
599          if (rc->param.bitrate) {      rc->quant_count[data->quant]++;
         zone_process(rc, create);  
                 internal_scale(rc);  
     }else{  
         /* external scaler: ignore zone */  
         for (i=0;i<rc->num_frames;i++) {  
             rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[i].weight = 1.0;  
         }  
         rc->avg_weight = 1.0;  
         rc->tot_quant = 0;  
     }  
         pre_process1(rc);  
600    
601      for (i=0; i<32;i++) {      if (data->type == XVID_TYPE_IVOP) {
602          rc->pquant_error[i] = 0;          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
     }  
603    
604      rc->fq_error = 0;          rc->overflow += rc->KFoverflow;
605            rc->KFoverflow = s->desired_length - data->length;
606    
607      *handle = rc;          if (kfdiff > 1) {  /* non-consecutive keyframes */
608          return(0);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
609            }else{ /* consecutive keyframes */
610                            rc->overflow += rc->KFoverflow;
611                            rc->KFoverflow = 0;
612                            rc->KFoverflow_partial = 0;
613            }
614            rc->KF_idx++;
615        } else {
616            /* distribute part of the keyframe overflow */
617            rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;
618            rc->KFoverflow -= rc->KFoverflow_partial;
619  }  }
620    
621            DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i desired:%d overflow:%i\n",
622                            data->frame_num,
623                            frame_type[data->type-1],
624                            data->quant,
625                            s->length,
626                            s->scaled_length,
627                            data->length,
628                            s->desired_length,
629                            rc->overflow);
630    
 static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  
 {  
     free(rc->keyframe_locations);  
     free(rc->stats);  
         free(rc);  
631          return(0);          return(0);
632  }  }
633    
634    /*****************************************************************************
635     * Helper functions definition
636     ****************************************************************************/
637    
638    #define BUF_SZ   1024
639    #define MAX_COLS 5
640    
641  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  /* open stats file, and count num frames */
642    static int
643    det_stats_length(rc_2pass2_t * rc, char * filename)
644  {  {
645      stat_t * s = &rc->stats[data->frame_num];      FILE * f;
646      int overflow;      int n, ignore;
647      int desired;      char type;
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
   
         /*  
          * 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.  
          */  
   
         /* First case: Another plugin has already set a quantizer */  
     if (data->quant > 0)  
                 return(0);  
648    
649          /* Second case: We are in a Quant zone */      rc->num_frames = 0;
650          if (s->zone_mode == XVID_ZONE_QUANT) {      rc->num_keyframes = 0;
651    
652                  rc->fq_error += s->weight;      if ((f = fopen(filename, "rt")) == NULL)
653                  data->quant = (int)rc->fq_error;          return 0;
                 rc->fq_error -= data->quant;  
654    
655                  s->desired_length = s->length;      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",
656            &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {
657            if (type == 'i') {
658                rc->num_frames++;
659                rc->num_keyframes++;
660            }else if (type == 'p' || type == 'b' || type == 's') {
661                rc->num_frames++;
662            }
663        }
664    
665                  return(0);      fclose(f);
666    
667        return 1;
668          }          }
669    
670          /* Third case: insufficent stats data */  /* open stats file(s) and read into rc->stats array */
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
671    
672          /*  static int
673           * The last case is the one every normal minded developer should fear to  load_stats(rc_2pass2_t *rc, char * filename)
674           * maintain in a project :-)  {
675           */      FILE * f;
676        int i, not_scaled;
677    
         /* XXX: why by 8 */  
         overflow = rc->overflow / 8;  
678    
679          /*      if ((f = fopen(filename, "rt"))==NULL)
680           * The rc->overflow field represents the overflow in current scene (between two          return 0;
          * IFrames) so we must not forget to reset it if we are enetring a new scene  
          */  
         if (s->type == XVID_TYPE_IVOP) {  
                 overflow = 0;  
         }  
681    
682          desired = s->scaled_length;      i = 0;
683            not_scaled = 0;
684        while(i < rc->num_frames) {
685            stat_t * s = &rc->stats[i];
686            int n;
687            char type;
688    
689          dbytes = desired;                  s->scaled_length = 0;
690          if (s->type == XVID_TYPE_IVOP) {          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);
691                  dbytes += desired * rc->param.keyframe_boost / 100;          if (n == EOF) break;
692                    if (n < 7) {
693                            not_scaled = 1;
694          }          }
         dbytes /= rc->movie_curve;  
695    
696          /*          if (type == 'i') {
697           * We are now entering in the hard part of the algo, it was first designed              s->type = XVID_TYPE_IVOP;
698           * to work with i/pframes only streams, so the way it computes things is          }else if (type == 'p' || type == 's') {
699           * adapted to pframes only. However we can use it if we just take care to              s->type = XVID_TYPE_PVOP;
700           * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and          }else if (type == 'b') {
701           * then before really using values depending on frame sizes, scaling the              s->type = XVID_TYPE_BVOP;
702           * value again with the inverse ratio          }else{  /* unknown type */
703           */              DPRINTF(XVID_DEBUG_RC, "WARNING: unknown stats frame type, assuming pvop\n");
704          if (s->type == XVID_TYPE_BVOP) {              s->type = XVID_TYPE_PVOP;
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
705          }          }
706    
707          /*          i++;
          * 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[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
   
                 if (labs(desired) > fabs(rc->curve_comp_error)) {  
                         desired = (int)rc->curve_comp_error;  
                 }  
708          }          }
709    
710          rc->curve_comp_error -= desired;      rc->num_frames = i;
   
         /*  
          * Alt curve treatment is not that hard to understand though the formulas  
          * seem to be huge. Alt treatment is basically a way to soft/harden the  
          * curve flux applying sine/linear/cosine ratios  
          */  
711    
712          /* XXX: warning */          fclose(f);
         curve_temp = 0;  
713    
714          if (rc->param.use_alt_curve) {      return 1;
                 if (s->type != XVID_TYPE_IVOP)  {  
                         if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  
                                 if (dbytes >= rc->alt_curve_high) {  
                                         curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                                 } else {  
                                         switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
                         } else {  
                                 if (dbytes <= rc->alt_curve_low){  
                                         curve_temp = dbytes;  
                                 } else {  
                                         switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
715                                          }                                          }
716    
717    #if 0
718    static void print_stats(rc_2pass2_t * rc)
719    {
720        int i;
721        DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");
722            for (i = 0; i < rc->num_frames; i++) {
723            stat_t * s = &rc->stats[i];
724            DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);
725                                  }                                  }
726                          }                          }
727    #endif
728    
729                          /*  /* pre-process the statistics data
730                           * End of code path for curve_temp, as told earlier, we are now      - for each type, count, tot_length, min_length, max_length
731                           * obliged to scale the value to a bframe one using the inverse      - set keyframes_locations
                          * ratio applied earlier  
732                           */                           */
                         if (s->type == XVID_TYPE_BVOP)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
733    
734                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;  static void
735    pre_process0(rc_2pass2_t * rc)
736    {
737        int i,j;
738    
                         desired += ((int)curve_temp);  
                         rc->curve_comp_error += curve_temp - (int)curve_temp;  
                 } else {  
739                          /*                          /*
740                           * End of code path for dbytes, as told earlier, we are now           * *rc fields initialization
741                           * obliged to scale the value to a bframe one using the inverse           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
742                           * ratio applied earlier           *     with real values of the 1pass
743                           */                           */
744                          if (s->type == XVID_TYPE_BVOP)           for (i=0; i<3; i++) {
745                                  dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  rc->count[i]=0;
746                    rc->tot_length[i] = 0;
747                          desired += ((int)dbytes);                  rc->min_length[i] = INT_MAX;
                         rc->curve_comp_error += dbytes - (int)dbytes;  
748                  }                  }
749    
750          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {          rc->max_length = INT_MIN;
   
                 curve_temp = rc->curve_comp_scale;  
                 if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  
                         curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
                 } else {  
                         curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
751    
752                  /*                  /*
753                   * End of code path for curve_temp, as told earlier, we are now           * Loop through all frames and find/compute all the stuff this function
754                   * obliged to scale the value to a bframe one using the inverse           * is supposed to do
                  * ratio applied earlier  
755                   */                   */
756                  if (s->type == XVID_TYPE_BVOP)          for (i=j=0; i<rc->num_frames; i++) {
757                          curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  stat_t * s = &rc->stats[i];
758    
759                  desired += (int)curve_temp;                  rc->count[s->type-1]++;
760                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  rc->tot_length[s->type-1] += s->length;
         } else {  
                 /*  
                  * End of code path for dbytes, as told earlier, we are now  
                  * obliged to scale the value to a bframe one using the inverse  
                  * ratio applied earlier  
                  */  
                 if (s->type == XVID_TYPE_BVOP){  
                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
                 }  
761    
762                  desired += (int)dbytes;                  if (s->length < rc->min_length[s->type-1]) {
763                  rc->curve_comp_error += dbytes - (int)dbytes;                          rc->min_length[s->type-1] = s->length;
764          }          }
765    
766                    if (s->length > rc->max_length) {
767                            rc->max_length = s->length;
768                    }
769    
         /*  
          * We can't do bigger frames than first pass, this would be stupid as first  
          * pass is quant=2 and that reaching quant=1 is not worth it. We would lose  
          * many bytes and we would not not gain much quality.  
          */  
         if (desired > s->length) {  
                 rc->curve_comp_error += desired - s->length;  
                 desired = s->length;  
         }else{  
                 if (desired < rc->min_length[s->type-1]) {  
770                          if (s->type == XVID_TYPE_IVOP){                          if (s->type == XVID_TYPE_IVOP){
771                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;                          rc->keyframe_locations[j] = i;
772                          }                          j++;
                         desired = rc->min_length[s->type-1];  
773                  }                  }
774          }          }
775    
776          s->desired_length = desired;          /*
777             * Nota Bene:
778             * The "per sequence" overflow system considers a natural sequence to be
779             * formed by all frames between two iframes, so if we want to make sure
780             * the system does not go nuts during last sequence, we force the last
781             * frame to appear in the keyframe locations array.
782             */
783        rc->keyframe_locations[j] = i;
784    
785            DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);
786            DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);
787            DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);
788    }
789    
790    /* calculate zone weight "center" */
791    
792          /* if this keyframe is too close to the next, reduce it's byte allotment  static void
793             XXX: why do we do this after setting the desired length  */  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
794    {
795        int i,j;
796        int n = 0;
797    
798          if (s->type == XVID_TYPE_IVOP) {      rc->avg_weight = 0.0;
799                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];      rc->tot_quant = 0;
800    
                 if (KFdistance < rc->param.kftreshold) {  
801    
802                          KFdistance = KFdistance - rc->param.min_key_interval;      if (create->num_zones == 0) {
803            for (j = 0; j < rc->num_frames; j++) {
804                rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
805                rc->stats[j].weight = 1.0;
806            }
807            rc->avg_weight += rc->num_frames * 1.0;
808            n += rc->num_frames;
809        }
810    
                         if (KFdistance >= 0) {  
                                 int KF_min_size;  
811    
812                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;      for(i=0; i < create->num_zones; i++) {
                                 if (KF_min_size < 1)  
                                         KF_min_size = 1;  
813    
814                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
                                         (rc->param.kftreshold - rc->param.min_key_interval);  
815    
816                                  if (desired < 1)          if (i==0 && create->zones[i].frame > 0) {
817                                          desired = 1;              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
818                          }                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
819                    rc->stats[j].weight = 1.0;
820                  }                  }
821                rc->avg_weight += create->zones[i].frame * 1.0;
822                n += create->zones[i].frame;
823          }          }
824    
825          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
826                for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
827          /* Reign in overflow with huge frames */                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
828          if (labs(overflow) > labs(rc->overflow)) {                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
                 overflow = rc->overflow;  
829          }          }
830                next -= create->zones[i].frame;
831          /* Make sure overflow doesn't run away */              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
832          if (overflow > desired * rc->param.max_overflow_improvement / 100) {              n += next;
833                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :          }else{  /* XVID_ZONE_QUANT */
834                          overflow * rc->param.max_overflow_improvement / 100;              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
835          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
836                  desired += desired * rc->param.max_overflow_degradation / -100;                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
837          } else {                  rc->tot_quant += rc->stats[j].length;
                 desired += overflow;  
838          }          }
   
         /* Make sure we are not higher than desired frame size */  
         if (desired > rc->max_length) {  
                 capped_to_max_framesize = 1;  
                 desired = rc->max_length;  
                 DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",  
                                 data->frame_num);  
839          }          }
840        }
841        rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
842    
843          /* Make sure to not scale below the minimum framesize */      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);
         if (desired < rc->min_length[s->type-1]) {  
                 desired = rc->min_length[s->type-1];  
                 DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
                                 data->frame_num);  
844          }          }
845    
         /*  
          * Don't laugh at this very 'simple' quant<->filesize relationship, it  
          * proves to be acurate enough for our algorithm  
          */  
         data->quant= (s->quant * s->length) / desired;  
846    
847          /* Let's clip the computed quantizer, if needed */  /* scale the curve */
         if (data->quant < 1) {  
                 data->quant = 1;  
         } else if (data->quant > 31) {  
                 data->quant = 31;  
         } else if (s->type != XVID_TYPE_IVOP) {  
848    
849                  /*  static void
850                   * The frame quantizer has not been clipped, this appear to be a good  internal_scale(rc_2pass2_t *rc)
851                   * computed quantizer, however past frames give us some info about how  {
852                   * this quantizer performs against the algo prevision. Let's use this          int64_t target  = rc->target - rc->tot_quant;
853                   * prevision to increase the quantizer when we observe a too big          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;
854                   * accumulated error          double scaler;
855                   */          int i, num_MBs;
                 if (s->type== XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
856    
857                          if (rc->bquant_error[data->quant] >= 1.0) {          /* Let's compute a linear scaler in order to perform curve scaling */
858                                  rc->bquant_error[data->quant] -= 1.0;          scaler = (double)target / (double)pass1_length;
                                 data->quant++;  
                         }  
                 } else {  
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
859    
860                          if (rc->pquant_error[data->quant] >= 1.0) {          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
861                                  rc->pquant_error[data->quant] -= 1.0;                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
862                                  ++data->quant;          scaler = 1.0;
                         }  
                 }  
863          }          }
864    
865        DPRINTF(XVID_DEBUG_RC,
866                            "Before correction: target=%i, tot_length=%i, scaler=%f\n",
867                            (int)target, (int)pass1_length, scaler);
868    
869          /*          /*
870           * Now we have a computed quant that is in the right quante range, with a           * Compute min frame lengths (for each frame type) according to the number
871           * possible +1 correction due to cumulated error. We can now safely clip           * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so
872           * the quantizer again with user's quant ranges. "Safely" means the Rate           * blocks[0] should be enough) to know how many MBs there are.
873           * Control could learn more about this quantizer, this knowledge is useful           *
874           * for future frames even if it this quantizer won't be really used atm,           * We compare these hardcoded values with observed values in first pass
875           * that's why we don't perform this clipping earlier.           * (determined in pre_process0).Then we keep the real minimum.
876           */           */
877          if (data->quant < data->min_quant[s->type-1]) {          num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];
878                  data->quant = data->min_quant[s->type-1];  
879          } else if (data->quant > data->max_quant[s->type-1]) {          if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)
880                  data->quant = data->max_quant[s->type-1];                  rc->min_length[0] = ((num_MBs*22) + 240) / 8;
881          }  
882            if(rc->min_length[1] > ((num_MBs) + 88)  / 8)
883                    rc->min_length[1] = ((num_MBs) + 88)  / 8;
884    
885            if(rc->min_length[2] > 8)
886                    rc->min_length[2] = 8;
887    
888          /*          /*
889           * To avoid big quality jumps from frame to frame, we apply a "security"           * Perform an initial scale pass.
890           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * If a frame size is scaled underneath our hardcoded minimums, then we
891           * to predicted frames (P and B)           * force the frame size to the minimum, and deduct the original & scaled
892             * frame length from the original and target total lengths
893           */           */
894          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {          for (i=0; i<rc->num_frames; i++) {
895                    stat_t * s = &rc->stats[i];
896                    int len;
897    
898                  if (data->quant > rc->last_quant[s->type-1] + 2) {          if (s->zone_mode == XVID_ZONE_QUANT) {
899                          data->quant = rc->last_quant[s->type-1] + 2;              s->scaled_length = s->length;
900                          DPRINTF(XVID_DEBUG_RC,                          continue;
                                         "[%i] p/b-frame quantizer prevented from rising too steeply\n",  
                                         data->frame_num);  
901                  }                  }
902                  if (data->quant < rc->last_quant[s->type-1] - 2) {  
903                          data->quant = rc->last_quant[s->type-1] - 2;                  /* Compute the scaled length */
904                          DPRINTF(XVID_DEBUG_RC,                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
905                                          "[%i] p/b-frame quantizer prevented from falling too steeply\n",  
906                                          data->frame_num);                  /* Compare with the computed minimum */
907                    if (len < rc->min_length[s->type-1]) {
908                            /* force frame size to our computed minimum */
909                            s->scaled_length = rc->min_length[s->type-1];
910                            target -= s->scaled_length;
911                            pass1_length -= s->length;
912                    } else {
913                            /* Do nothing for now, we'll scale this later */
914                            s->scaled_length = 0;
915                  }                  }
916          }          }
917    
918          /*          /* Correct the scaler for all non forced frames */
919           * We don't want to pollute the RC history results when our computed quant          scaler = (double)target / (double)pass1_length;
          * has been computed from a capped frame size  
          */  
         if (capped_to_max_framesize == 0) {  
                 rc->last_quant[s->type-1] = data->quant;  
         }  
920    
921          return 0;          /* Detect undersizing */
922        if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
923                    DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
924                    scaler = 1.0;
925  }  }
926    
927            DPRINTF(XVID_DEBUG_RC,
928                            "After correction: target=%i, tot_length=%i, scaler=%f\n",
929                            (int)target, (int)pass1_length, scaler);
930    
931            /* Do another pass with the new scaler */
932            for (i=0; i<rc->num_frames; i++) {
933                    stat_t * s = &rc->stats[i];
934    
935                    /* Ignore frame with forced frame sizes */
936                    if (s->scaled_length == 0)
937                            s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
938            }
939    }
940    
941  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  static void
942    pre_process1(rc_2pass2_t * rc)
943  {  {
944      stat_t * s = &rc->stats[data->frame_num];      int i;
945        double total1, total2;
946        uint64_t ivop_boost_total;
947    
948          /* Insufficent stats data */      ivop_boost_total = 0;
949      if (data->frame_num >= rc->num_frames)      rc->curve_comp_error = 0;
         return 0;  
950    
951      rc->quant_count[data->quant]++;      for (i=0; i<3; i++) {
952            rc->tot_scaled_length[i] = 0;
953        }
954    
955      if (data->type == XVID_TYPE_IVOP) {      for (i=0; i<rc->num_frames; i++) {
956          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);          stat_t * s = &rc->stats[i];
957    
958          rc->overflow += rc->KFoverflow;          rc->tot_scaled_length[s->type-1] += s->scaled_length;
         rc->KFoverflow = s->desired_length - data->length;  
959    
960          if (kfdiff > 1) {  // non-consecutive keyframes          if (s->type == XVID_TYPE_IVOP) {
961              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;
         }else{ // consecutive keyframes  
                         rc->overflow += rc->KFoverflow;  
                         rc->KFoverflow = 0;  
                         rc->KFoverflow_partial = 0;  
962          }          }
         rc->KF_idx++;  
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
963      }      }
964    
965      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /
966          data->frame_num,                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));
         data->quant,  
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
967    
968      return(0);      for(i=0; i<3; i++) {
969            if (rc->count[i] == 0 || rc->movie_curve == 0) {
970                rc->avg_length[i] = 1;
971            }else{
972                rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;
973            }
974  }  }
975    
976        /* --- */
977    
978        total1=total2=0;
979    
980        for (i=0; i<rc->num_frames; i++) {
981            stat_t * s = &rc->stats[i];
982    
983  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)          if (s->type != XVID_TYPE_IVOP) {
984  {              double dbytes,dbytes2;
     switch(opt)  
     {  
     case XVID_PLG_INFO :  
         return 0;  
985    
986      case XVID_PLG_CREATE :              dbytes = s->scaled_length / rc->movie_curve;
987          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);              dbytes2 = 0; /* XXX: warning */
988                total1 += dbytes;
989    
990      case XVID_PLG_DESTROY :                          if (dbytes > rc->avg_length[s->type-1]) {
991          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);                                  dbytes2=((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);
992                            } else {
993                                    dbytes2 = ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
994                            }
995    
996      case XVID_PLG_BEFORE :                          if (dbytes2 < rc->min_length[s->type-1])
997          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);                                      dbytes2 = rc->min_length[s->type-1];
998    
999      case XVID_PLG_AFTER :              total2 += dbytes2;
1000          return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);          }
1001      }      }
1002    
1003      return XVID_ERR_FAIL;      rc->curve_comp_scale = total1 / total2;
1004    
1005            DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: pframe%d bframe:%d\n",
1006                (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale),
1007                            (int)(rc->avg_length[XVID_TYPE_BVOP-1] * rc->curve_comp_scale));
1008    
1009        rc->overflow = 0;
1010        rc->KFoverflow = 0;
1011        rc->KFoverflow_partial = 0;
1012        rc->KF_idx = 1;
1013  }  }
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