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revision 1040, Thu May 22 22:17:44 2003 UTC revision 1161, Wed Oct 1 23:23:01 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 1.1.2.23 2003-10-01 23:23:01 edgomez 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      int * keyframe_locations;      int * keyframe_locations;
100      stat_t * stats;      stat_t * stats;
101    
102      double pquant_error[32];          double quant_error[3][32];
     double bquant_error[32];  
103      int quant_count[32];      int quant_count[32];
104      int last_quant[3];      int last_quant[3];
105    
# Line 107  Line 113 
113  } rc_2pass2_t;  } rc_2pass2_t;
114    
115    
116    /*****************************************************************************
117     * Sub plugin functions prototypes
118     ****************************************************************************/
119    
120    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
121    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
122    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
123    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
124    
125    /*****************************************************************************
126     * Plugin definition
127     ****************************************************************************/
128    
129  #define BUF_SZ 1024  int
130  #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)  
131  {  {
132      FILE * f;          switch(opt) {
133      int n, ignore;          case XVID_PLG_INFO :
     char type;  
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
134          return 0;          return 0;
135    
136      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_CREATE :
137          &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++;  
         }  
     }  
138    
139      fclose(f);          case XVID_PLG_DESTROY :
140                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
141    
142      return 1;          case XVID_PLG_BEFORE :
143                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
144    
145            case XVID_PLG_AFTER :
146                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
147  }  }
148    
149            return XVID_ERR_FAIL;
150    }
151    
152    /*****************************************************************************
153     * Sub plugin functions definitions
154     ****************************************************************************/
155    
156    /* First a few local helping function prototypes */
157    static  int det_stats_length(rc_2pass2_t * rc, char * filename);
158    static  int load_stats(rc_2pass2_t *rc, char * filename);
159    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
160    static void internal_scale(rc_2pass2_t *rc);
161    static void pre_process0(rc_2pass2_t * rc);
162    static void pre_process1(rc_2pass2_t * rc);
163    
164  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
165     *--------------------------------------------------------------------------*/
166    
167  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
168    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
169  {  {
170      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
171      int i, not_scaled;          rc_2pass2_t * rc;
172            int i;
173    
174            rc = malloc(sizeof(rc_2pass2_t));
175            if (rc == NULL)
176                    return XVID_ERR_MEMORY;
177    
178      if ((f = fopen(filename, "rt"))==NULL)          rc->param = *param;
         return 0;  
179    
180      i = 0;          /*
181          not_scaled = 0;           * Initialize all defaults
182      while(i < rc->num_frames) {           */
183          stat_t * s = &rc->stats[i];  #define _INIT(a, b) if((a) <= 0) (a) = (b)
184          int n;          /* Let's set our defaults if needed */
185          char type;          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
186            _INIT(rc->param.payback_method, DEFAULT_PAYBACK_METHOD);
187            _INIT(rc->param.bitrate_payback_delay, DEFAULT_BITRATE_PAYBACK_DELAY);
188            _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
189            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
190            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
191            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
192    
193            /* Keyframe settings */
194            _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);
195            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
196            _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);
197    #undef _INIT
198    
199                  s->scaled_length = 0;          /* Initialize some stuff to zero */
200          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;
201          if (n == EOF) break;  
202                  if (n < 7) {          for(i=0; i<3; i++) {
203                          not_scaled = 1;                  int j;
204                    for (j=0; j<32; j++)
205                            rc->quant_error[i][j] = 0;
206                  }                  }
207    
208          if (type == 'i') {          for (i=0; i<3; i++)
209              s->type = XVID_TYPE_IVOP;                  rc->last_quant[i] = 0;
210          }else if (type == 'p' || type == 's') {  
211              s->type = XVID_TYPE_PVOP;          rc->fq_error = 0;
212          }else if (type == 'b') {  
213              s->type = XVID_TYPE_BVOP;          /* Count frames in the stats file */
214          }else{  /* unknown type */          if (!det_stats_length(rc, param->filename)) {
215              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);
216              s->type = XVID_TYPE_PVOP;                  free(rc);
217                    return XVID_ERR_FAIL;
218          }          }
219    
220          i++;          /* Allocate the stats' memory */
221            if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {
222                    free(rc);
223                    return XVID_ERR_MEMORY;
224      }      }
225    
226      rc->num_frames = i;          /*
227             * Allocate keyframes location's memory
228             * PS: see comment in pre_process0 for the +1 location requirement
229             */
230            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
231            if (rc->keyframe_locations == NULL) {
232                    free(rc->stats);
233                    free(rc);
234                    return XVID_ERR_MEMORY;
235            }
236    
237          fclose(f);          if (!load_stats(rc, param->filename)) {
238                    DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);
239                    free(rc->keyframe_locations);
240                    free(rc->stats);
241                    free(rc);
242                    return XVID_ERR_FAIL;
243            }
244    
245      return 1;          /* Compute the target filesize */
246            if (rc->param.bitrate<0) {
247                    /* if negative, bitrate equals the target (in kbytes) */
248                    rc->target = (-rc->param.bitrate) * 1024;
249            } else if (rc->num_frames  < create->fbase/create->fincr) {
250                    /* Source sequence is less than 1s long, we do as if it was 1s long */
251                    rc->target = rc->param.bitrate / 8;
252            } else {
253                    /* Target filesize = bitrate/8 * numframes / framerate */
254                    rc->target =
255                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
256                             (uint64_t)create->fincr) / \
257                            ((uint64_t)create->fbase * 8);
258  }  }
259    
260            DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",
261                            create->fbase, create->fincr,
262                            (double)create->fbase/(double)create->fincr);
263            DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);
264            DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);
265            DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);
266    
267            /* Compensate the average frame overhead caused by the container */
268            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
269            DPRINTF(XVID_DEBUG_RC, "Container Frame overhead: %d\n", rc->param.container_frame_overhead);
270            DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);
271    
272            /*
273             * First data pre processing:
274             *  - finds the minimum frame length for each frame type during 1st pass.
275             *     rc->min_size[]
276             *  - determines the maximum frame length observed (no frame type distinction).
277             *     rc->max_size
278             *  - count how many times each frame type has been used.
279             *     rc->count[]
280             *  - total bytes used per frame type
281             *     rc->total[]
282             *  - store keyframe location
283             *     rc->keyframe_locations[]
284             */
285            pre_process0(rc);
286    
287  #if 0          /*
288  static void print_stats(rc_2pass2_t * rc)           * When bitrate is not given it means it has been scaled by an external
289  {           * application
290      int i;           */
291      DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");          if (rc->param.bitrate) {
292                    /* Apply zone settings */
293                    zone_process(rc, create);
294                    /* Perform curve scaling */
295                    internal_scale(rc);
296            } else {
297                    /* External scaling -- zones are ignored */
298          for (i = 0; i < rc->num_frames; i++) {          for (i = 0; i < rc->num_frames; i++) {
299          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
300          DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
301      }      }
302                    rc->avg_weight = 1.0;
303                    rc->tot_quant = 0;
304  }  }
 #endif  
   
 /* pre-process the statistics data  
     - for each type, count, tot_length, min_length, max_length  
     - set keyframes_locations  
 */  
305    
306  static void          pre_process1(rc);
 pre_process0(rc_2pass2_t * rc)  
 {  
     int i,j;  
307    
308      for (i=0; i<3; i++) {          *handle = rc;
309          rc->count[i]=0;          return(0);
         rc->tot_length[i] = 0;  
         rc->last_quant[i] = 0;  
                 rc->min_length[i] = INT_MAX;  
310      }      }
311    
312          rc->max_length = INT_MIN;  /*----------------------------------------------------------------------------
313     *--------------------------------------------------------------------------*/
     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;  
314    
315          if (s->length < rc->min_length[s->type-1]) {  static int
316              rc->min_length[s->type-1] = s->length;  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
317    {
318            free(rc->keyframe_locations);
319            free(rc->stats);
320            free(rc);
321            return(0);
322          }          }
323    
324          if (s->length > rc->max_length) {  /*----------------------------------------------------------------------------
325              rc->max_length = s->length;   *--------------------------------------------------------------------------*/
         }  
326    
327          if (s->type == XVID_TYPE_IVOP) {  static int
328              rc->keyframe_locations[j] = i;  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
329              j++;  {
330          }          stat_t * s = &rc->stats[data->frame_num];
331      }          int overflow;
332            int desired;
333            double dbytes;
334            double curve_temp;
335            double scaled_quant;
336            int capped_to_max_framesize = 0;
337    
338          /*          /*
339           * The "per sequence" overflow system considers a natural sequence to be           * This function is quite long but easy to understand. In order to simplify
340           * 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.  
341           */           */
     rc->keyframe_locations[j] = i;  
342    
343          DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);          /* First case: Another plugin has already set a quantizer */
344          DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);          if (data->quant > 0)
345          DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);                  return(0);
346    
347            /* Second case: We are in a Quant zone */
348            if (s->zone_mode == XVID_ZONE_QUANT) {
349                    rc->fq_error += s->weight;
350                    data->quant = (int)rc->fq_error;
351                    rc->fq_error -= data->quant;
352    
353                    s->desired_length = s->length;
354    
355                    return(0);
356  }  }
357    
358            /* Third case: insufficent stats data */
359            if (data->frame_num >= rc->num_frames)
360                    return 0;
361    
362  /* calculate zone weight "center" */          /* XXX: why by 8 */
363            overflow = rc->overflow / 8;
364    
365  static void          /*
366  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)           * The rc->overflow field represents the overflow in current scene (between two
367  {           * IFrames) so we must not forget to reset it if we are entering a new scene
368      int i,j;           */
369      int n = 0;          if (s->type == XVID_TYPE_IVOP)
370                    overflow = 0;
371    
372      rc->avg_weight = 0.0;          desired = s->scaled_length;
     rc->tot_quant = 0;  
373    
374            dbytes = desired;
375            if (s->type == XVID_TYPE_IVOP)
376                    dbytes += desired * rc->param.keyframe_boost / 100;
377            dbytes /= rc->movie_curve;
378    
379      if (create->num_zones == 0) {          /*
380          for (j = 0; j < rc->num_frames; j++) {           * Apply user's choosen Payback method. Payback helps bitrate to follow the
381              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;           * scaled curve "paying back" past errors in curve previsions.
382              rc->stats[j].weight = 1.0;           */
383          }          if (rc->param.payback_method == XVID_PAYBACK_BIAS) {
384          rc->avg_weight += rc->num_frames * 1.0;                  desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);
385          n += rc->num_frames;          } else {
386                    desired = (int)(rc->curve_comp_error * dbytes /
387                                                    rc->avg_length[s->type-1] / rc->param.bitrate_payback_delay);
388    
389                    if (labs(desired) > fabs(rc->curve_comp_error))
390                            desired = (int)rc->curve_comp_error;
391      }      }
392    
393            rc->curve_comp_error -= desired;
394    
395      for(i=0; i < create->num_zones; i++) {          /* XXX: warning */
396            curve_temp = 0;
397    
398          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) {
399    
400          if (i==0 && create->zones[i].frame > 0) {                  curve_temp = rc->curve_comp_scale;
401              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {                  if (dbytes > rc->avg_length[s->type-1]) {
402                  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);
403                  rc->stats[j].weight = 1.0;                  } else {
404              }                          curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
405          }          }
406    
407          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {                  desired += (int)curve_temp;
408              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {                  rc->curve_comp_error += curve_temp - (int)curve_temp;
409                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          } else {
410                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  desired += (int)dbytes;
411              }                  rc->curve_comp_error += dbytes - (int)dbytes;
             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);  
412  }  }
413    
   
 /* 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;  
   
   
414          /*          /*
415           * Perform an initial scale pass.           * We can't do bigger frames than first pass, this would be stupid as first
416           * 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
417           * 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  
418           */           */
419            if (desired > s->length) {
420          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;                  rc->curve_comp_error += desired - s->length;
421          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;  
422                      }else{                      }else{
423                              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;  
   
424          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
425              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;
         }  
426      }      }
427                            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;  
428          }          }
429      }      }
430    
431      /* 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);  
432    
433                                  if (rc->param.alt_curve_min_rel_qual < 20)          /*
434                                          rc->param.alt_curve_min_rel_qual = 20;           * if this keyframe is too close to the next, reduce it's byte allotment
435              }else{           * XXX: why do we do this after setting the desired length ?
436                                  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;  
437    
438          if (rc->param.alt_curve_low_dist > 100) {          if (s->type == XVID_TYPE_IVOP) {
439                          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)));  
                         }  
                 }  
     }  
     /* --- */  
440    
441                    if (KFdistance < rc->param.kftreshold) {
442    
443      total1=total2=0;                          KFdistance -= rc->param.min_key_interval;
     for (i=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
444    
445          if (s->type != XVID_TYPE_IVOP) {                          if (KFdistance >= 0) {
446              double dbytes,dbytes2;                                  int KF_min_size;
447    
448              dbytes = s->scaled_length / rc->movie_curve;                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;
449              dbytes2 = 0; /* XXX: warning */                                  if (KF_min_size < 1)
450              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];  
451    
452              if (rc->param.use_alt_curve) {                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /
453                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                                          (rc->param.kftreshold - rc->param.min_key_interval);
454    
455                      if (dbytes >= rc->alt_curve_high) {                                  if (desired < 1)
456                                                  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))));  
                                                 }  
457                                          }                                          }
                 }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))));  
458                                                  }                                                  }
459                                          }                                          }
460    
461                  }          /*
462             * The "sens commun" would force us to use rc->avg_length[s->type-1] but
463             * even VFW code uses the pframe average length. Note that this length is
464             * used with desired which represents bframes _and_ pframes length.
465             *
466             * XXX: why are we using the avg pframe length for all frame types ?
467             */
468            overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);
469    
470            /* Reign in overflow with huge frames */
471            if (labs(overflow) > labs(rc->overflow))
472                    overflow = rc->overflow;
473    
474            /* Make sure overflow doesn't run away */
475            if (overflow > desired * rc->param.max_overflow_improvement / 100) {
476                    desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :
477                            overflow * rc->param.max_overflow_improvement / 100;
478            } else if (overflow < desired * rc->param.max_overflow_degradation / -100){
479                    desired += desired * rc->param.max_overflow_degradation / -100;
480              }else{              }else{
481                  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);  
                 }  
482              }              }
483    
484              if (s->type == XVID_TYPE_BVOP) {          /* Make sure we are not higher than desired frame size */
485                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          if (desired > rc->max_length) {
486                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])                  capped_to_max_framesize = 1;
487                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                  desired = rc->max_length;
488              }else{                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",
489                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                                  data->frame_num);
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
             }  
             total2 += dbytes2;  
         }  
490      }      }
491    
492      rc->curve_comp_scale = total1 / total2;          /* Make sure to not scale below the minimum framesize */
493            if (desired < rc->min_length[s->type-1]) {
494      if (!rc->param.use_alt_curve) {                  desired = rc->min_length[s->type-1];
495          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",
496              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));                                  data->frame_num);
497      }      }
498    
499      if (rc->param.use_alt_curve) {          /*
500          int bonus_bias = rc->param.alt_curve_bonus_bias;           * Don't laugh at this very 'simple' quant<->filesize relationship, it
501          int oldquant = 1;           * proves to be acurate enough for our algorithm
502             */
503              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 */  
504    
505                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i\n", (int)rc->avg_length[XVID_TYPE_PVOP-1]);          /*
506                  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
507             * must cast it to integer
508             */
509            data->quant = (int)scaled_quant;
510    
511                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {          /* Let's clip the computed quantizer, if needed */
512              double curve_temp, dbytes;          if (data->quant < 1) {
513              int newquant;                  data->quant = 1;
514            } else if (data->quant > 31) {
515                    data->quant = 31;
516            } else if (s->type != XVID_TYPE_IVOP) {
517    
518              dbytes = i;                  /*
519                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * The frame quantizer has not been clipped, this appears to be a good
520                  if (dbytes >= rc->alt_curve_high) {                   * computed quantizer, do not loose quantizer decimal part that we
521                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                   * accumulate for later reuse when its sum represents a complete unit.
522                  }else{                   */
523                                          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))));  
                                         }  
                                 }  
                         }  
524    
525                          if (rc->movie_curve > 1.0)                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
526                                  dbytes *= rc->movie_curve;                          rc->quant_error[s->type-1][data->quant] -= 1.0;
527                            data->quant++;
528                          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) {
529                          if (newquant > 1) {                          rc->quant_error[s->type-1][data->quant] += 1.0;
530                                  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);  
                                 }  
                         }  
531                  }                  }
532    
533      }      }
534    
535      rc->overflow = 0;          /*
536      rc->KFoverflow = 0;           * Now we have a computed quant that is in the right quante range, with a
537      rc->KFoverflow_partial = 0;           * possible +1 correction due to cumulated error. We can now safely clip
538      rc->KF_idx = 1;           * the quantizer again with user's quant ranges. "Safely" means the Rate
539             * Control could learn more about this quantizer, this knowledge is useful
540             * for future frames even if it this quantizer won't be really used atm,
541             * that's why we don't perform this clipping earlier.
542             */
543            if (data->quant < data->min_quant[s->type-1]) {
544                    data->quant = data->min_quant[s->type-1];
545            } else if (data->quant > data->max_quant[s->type-1]) {
546                    data->quant = data->max_quant[s->type-1];
547  }  }
548    
549            /*
550             * To avoid big quality jumps from frame to frame, we apply a "security"
551             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
552             * to predicted frames (P and B)
553             */
554            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
555    
556                    if (data->quant > rc->last_quant[s->type-1] + 2) {
557                            data->quant = rc->last_quant[s->type-1] + 2;
558  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                          DPRINTF(XVID_DEBUG_RC,
559  {                                          "[%i] p/b-frame quantizer prevented from rising too steeply\n",
560      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;                                          data->frame_num);
561      rc_2pass2_t * rc;                  }
562      int i;                  if (data->quant < rc->last_quant[s->type-1] - 2) {
563                            data->quant = rc->last_quant[s->type-1] - 2;
564      rc = malloc(sizeof(rc_2pass2_t));                          DPRINTF(XVID_DEBUG_RC,
565      if (rc == NULL)                                          "[%i] p/b-frame quantizer prevented from falling too steeply\n",
566          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;  
567      }      }
   
     if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {  
         free(rc);  
         return XVID_ERR_MEMORY;  
568      }      }
569    
570      /*      /*
571           * 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
572           * 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.  
573           */           */
574      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {          if (capped_to_max_framesize == 0)
575          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;  
     }  
576    
577      /* pre-process our stats */          /* Force frame type */
578            data->type = s->type;
579    
580          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);  
581          }          }
582    
583      DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);  /*----------------------------------------------------------------------------
584          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  
585    
586    static int
587    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
588    {
589            const char frame_type[4] = { 'i', 'p', 'b', 's'};
590            stat_t * s = &rc->stats[data->frame_num];
591    
592          pre_process0(rc);          /* Insufficent stats data */
593            if (data->frame_num >= rc->num_frames)
594                    return 0;
595    
596          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);  
597    
598      for (i=0; i<32;i++) {          if (data->type == XVID_TYPE_IVOP) {
599          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;  
     }  
600    
601      rc->fq_error = 0;                  rc->overflow += rc->KFoverflow;
602                    rc->KFoverflow = s->desired_length - data->length;
603    
604      *handle = rc;                  if (kfdiff > 1) {  /* non-consecutive keyframes */
605          return(0);                          rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
606                    }else{ /* consecutive keyframes */
607                            rc->overflow += rc->KFoverflow;
608                            rc->KFoverflow = 0;
609                            rc->KFoverflow_partial = 0;
610                    }
611                    rc->KF_idx++;
612            } else {
613                    /* distribute part of the keyframe overflow */
614                    rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;
615                    rc->KFoverflow -= rc->KFoverflow_partial;
616  }  }
617    
618            DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i desired:%d overflow:%i\n",
619                            data->frame_num,
620                            frame_type[data->type-1],
621                            data->quant,
622                            s->length,
623                            s->scaled_length,
624                            data->length,
625                            s->desired_length,
626                            rc->overflow);
627    
 static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  
 {  
     free(rc->keyframe_locations);  
     free(rc->stats);  
         free(rc);  
628          return(0);          return(0);
629  }  }
630    
631    /*****************************************************************************
632     * Helper functions definition
633     ****************************************************************************/
634    
635    #define BUF_SZ   1024
636    #define MAX_COLS 5
637    
638  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  /* open stats file, and count num frames */
639    static int
640    det_stats_length(rc_2pass2_t * rc, char * filename)
641  {  {
642      stat_t * s = &rc->stats[data->frame_num];          FILE * f;
643      int overflow;          int n, ignore;
644      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);  
645    
646          /* Second case: We are in a Quant zone */          rc->num_frames = 0;
647          if (s->zone_mode == XVID_ZONE_QUANT) {          rc->num_keyframes = 0;
648    
649                  rc->fq_error += s->weight;          if ((f = fopen(filename, "rt")) == NULL)
650                  data->quant = (int)rc->fq_error;                  return 0;
                 rc->fq_error -= data->quant;  
651    
652                  s->desired_length = s->length;          while((n = fscanf(f, "%c %d %d %d %d %d %d\n",
653                                              &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {
654                    if (type == 'i') {
655                            rc->num_frames++;
656                            rc->num_keyframes++;
657                    }else if (type == 'p' || type == 'b' || type == 's') {
658                            rc->num_frames++;
659                    }
660            }
661    
662                  return(0);          fclose(f);
663    
664            return 1;
665          }          }
666    
667          /* Third case: insufficent stats data */  /* open stats file(s) and read into rc->stats array */
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
668    
669          /*  static int
670           * The last case is the one every normal minded developer should fear to  load_stats(rc_2pass2_t *rc, char * filename)
671           * maintain in a project :-)  {
672           */          FILE * f;
673            int i, not_scaled;
674    
         /* XXX: why by 8 */  
         overflow = rc->overflow / 8;  
675    
676          /*          if ((f = fopen(filename, "rt"))==NULL)
677           * 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;  
         }  
678    
679          desired = s->scaled_length;          i = 0;
680            not_scaled = 0;
681            while(i < rc->num_frames) {
682                    stat_t * s = &rc->stats[i];
683                    int n;
684                    char type;
685    
686          dbytes = desired;                  s->scaled_length = 0;
687          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);
688                  dbytes += desired * rc->param.keyframe_boost / 100;                  if (n == EOF) break;
689                    if (n < 7) {
690                            not_scaled = 1;
691          }          }
         dbytes /= rc->movie_curve;  
692    
693          /*                  if (type == 'i') {
694           * We are now entering in the hard part of the algo, it was first designed                          s->type = XVID_TYPE_IVOP;
695           * to work with i/pframes only streams, so the way it computes things is                  }else if (type == 'p' || type == 's') {
696           * adapted to pframes only. However we can use it if we just take care to                          s->type = XVID_TYPE_PVOP;
697           * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and                  }else if (type == 'b') {
698           * then before really using values depending on frame sizes, scaling the                          s->type = XVID_TYPE_BVOP;
699           * value again with the inverse ratio                  }else{  /* unknown type */
700           */                          DPRINTF(XVID_DEBUG_RC, "WARNING: unknown stats frame type, assuming pvop\n");
701          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];  
702          }          }
703    
704          /*                  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;  
                 }  
705          }          }
706    
707          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  
          */  
708    
709          /* XXX: warning */          fclose(f);
         curve_temp = 0;  
710    
711          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))));  
712                                          }                                          }
713    
714    #if 0
715    static void print_stats(rc_2pass2_t * rc)
716    {
717            int i;
718            DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");
719            for (i = 0; i < rc->num_frames; i++) {
720                    stat_t * s = &rc->stats[i];
721                    DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);
722                                  }                                  }
723                          }                          }
724    #endif
725    
726                          /*  /* pre-process the statistics data
727                           * End of code path for curve_temp, as told earlier, we are now     - for each type, count, tot_length, min_length, max_length
728                           * obliged to scale the value to a bframe one using the inverse     - set keyframes_locations
                          * ratio applied earlier  
729                           */                           */
                         if (s->type == XVID_TYPE_BVOP)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
730    
731                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;  static void
732    pre_process0(rc_2pass2_t * rc)
733    {
734            int i,j;
735    
                         desired += ((int)curve_temp);  
                         rc->curve_comp_error += curve_temp - (int)curve_temp;  
                 } else {  
736                          /*                          /*
737                           * End of code path for dbytes, as told earlier, we are now           * *rc fields initialization
738                           * 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
739                           * ratio applied earlier           *     with real values of the 1pass
740                           */                           */
741                          if (s->type == XVID_TYPE_BVOP)          for (i=0; i<3; i++) {
742                                  dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  rc->count[i]=0;
743                    rc->tot_length[i] = 0;
744                          desired += ((int)dbytes);                  rc->min_length[i] = INT_MAX;
                         rc->curve_comp_error += dbytes - (int)dbytes;  
745                  }                  }
746    
747          } 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);  
                 }  
748    
749                  /*                  /*
750                   * 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
751                   * obliged to scale the value to a bframe one using the inverse           * is supposed to do
                  * ratio applied earlier  
752                   */                   */
753                  if (s->type == XVID_TYPE_BVOP)          for (i=j=0; i<rc->num_frames; i++) {
754                          curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  stat_t * s = &rc->stats[i];
755    
756                  desired += (int)curve_temp;                  rc->count[s->type-1]++;
757                  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];  
                 }  
758    
759                  desired += (int)dbytes;                  if (s->length < rc->min_length[s->type-1]) {
760                  rc->curve_comp_error += dbytes - (int)dbytes;                          rc->min_length[s->type-1] = s->length;
761          }          }
762    
763                    if (s->length > rc->max_length) {
764                            rc->max_length = s->length;
765                    }
766    
         /*  
          * 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]) {  
767                          if (s->type == XVID_TYPE_IVOP){                          if (s->type == XVID_TYPE_IVOP){
768                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;                          rc->keyframe_locations[j] = i;
769                          }                          j++;
                         desired = rc->min_length[s->type-1];  
770                  }                  }
771          }          }
772    
773          s->desired_length = desired;          /*
774             * Nota Bene:
775             * The "per sequence" overflow system considers a natural sequence to be
776             * formed by all frames between two iframes, so if we want to make sure
777             * the system does not go nuts during last sequence, we force the last
778             * frame to appear in the keyframe locations array.
779             */
780            rc->keyframe_locations[j] = i;
781    
782            DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);
783            DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);
784            DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);
785    }
786    
787    /* calculate zone weight "center" */
788    
789          /* if this keyframe is too close to the next, reduce it's byte allotment  static void
790             XXX: why do we do this after setting the desired length  */  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
791    {
792            int i,j;
793            int n = 0;
794    
795          if (s->type == XVID_TYPE_IVOP) {          rc->avg_weight = 0.0;
796                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];          rc->tot_quant = 0;
797    
                 if (KFdistance < rc->param.kftreshold) {  
798    
799                          KFdistance = KFdistance - rc->param.min_key_interval;          if (create->num_zones == 0) {
800                    for (j = 0; j < rc->num_frames; j++) {
801                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
802                            rc->stats[j].weight = 1.0;
803                    }
804                    rc->avg_weight += rc->num_frames * 1.0;
805                    n += rc->num_frames;
806            }
807    
                         if (KFdistance >= 0) {  
                                 int KF_min_size;  
808    
809                                  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;  
810    
811                                  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);  
812    
813                                  if (desired < 1)                  if (i==0 && create->zones[i].frame > 0) {
814                                          desired = 1;                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
815                          }                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
816                                    rc->stats[j].weight = 1.0;
817                  }                  }
818                            rc->avg_weight += create->zones[i].frame * 1.0;
819                            n += create->zones[i].frame;
820          }          }
821    
822          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
823                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
824          /* Reign in overflow with huge frames */                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
825          if (labs(overflow) > labs(rc->overflow)) {                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
                 overflow = rc->overflow;  
826          }          }
827                            next -= create->zones[i].frame;
828          /* Make sure overflow doesn't run away */                          rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
829          if (overflow > desired * rc->param.max_overflow_improvement / 100) {                          n += next;
830                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :                  }else{  /* XVID_ZONE_QUANT */
831                          overflow * rc->param.max_overflow_improvement / 100;                          for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
832          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){                                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
833                  desired += desired * rc->param.max_overflow_degradation / -100;                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
834          } else {                                  rc->tot_quant += rc->stats[j].length;
                 desired += overflow;  
835          }          }
   
         /* 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);  
836          }          }
837            }
838            rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
839    
840          /* 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);  
841          }          }
842    
         /*  
          * 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;  
843    
844          /* 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) {  
845    
846                  /*  static void
847                   * The frame quantizer has not been clipped, this appear to be a good  internal_scale(rc_2pass2_t *rc)
848                   * computed quantizer, however past frames give us some info about how  {
849                   * this quantizer performs against the algo prevision. Let's use this          int64_t target  = rc->target - rc->tot_quant;
850                   * 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;
851                   * accumulated error          double scaler;
852                   */          int i, num_MBs;
                 if (s->type== XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
853    
854                          if (rc->bquant_error[data->quant] >= 1.0) {          /* Let's compute a linear scaler in order to perform curve scaling */
855                                  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;  
856    
857                          if (rc->pquant_error[data->quant] >= 1.0) {          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
858                                  rc->pquant_error[data->quant] -= 1.0;                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
859                                  ++data->quant;                  scaler = 1.0;
                         }  
                 }  
860          }          }
861    
862            DPRINTF(XVID_DEBUG_RC,
863                            "Before correction: target=%i, tot_length=%i, scaler=%f\n",
864                            (int)target, (int)pass1_length, scaler);
865    
866          /*          /*
867           * 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
868           * 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
869           * the quantizer again with user's quant ranges. "Safely" means the Rate           * blocks[0] should be enough) to know how many MBs there are.
870           * Control could learn more about this quantizer, this knowledge is useful           *
871           * 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
872           * that's why we don't perform this clipping earlier.           * (determined in pre_process0).Then we keep the real minimum.
873           */           */
874          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];
875                  data->quant = data->min_quant[s->type-1];  
876          } else if (data->quant > data->max_quant[s->type-1]) {          if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)
877                  data->quant = data->max_quant[s->type-1];                  rc->min_length[0] = ((num_MBs*22) + 240) / 8;
878          }  
879            if(rc->min_length[1] > ((num_MBs) + 88)  / 8)
880                    rc->min_length[1] = ((num_MBs) + 88)  / 8;
881    
882            if(rc->min_length[2] > 8)
883                    rc->min_length[2] = 8;
884    
885          /*          /*
886           * To avoid big quality jumps from frame to frame, we apply a "security"           * Perform an initial scale pass.
887           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * If a frame size is scaled underneath our hardcoded minimums, then we
888           * to predicted frames (P and B)           * force the frame size to the minimum, and deduct the original & scaled
889             * frame length from the original and target total lengths
890           */           */
891          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++) {
892                    stat_t * s = &rc->stats[i];
893                    int len;
894    
895                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (s->zone_mode == XVID_ZONE_QUANT) {
896                          data->quant = rc->last_quant[s->type-1] + 2;                          s->scaled_length = s->length;
897                          DPRINTF(XVID_DEBUG_RC,                          continue;
                                         "[%i] p/b-frame quantizer prevented from rising too steeply\n",  
                                         data->frame_num);  
898                  }                  }
899                  if (data->quant < rc->last_quant[s->type-1] - 2) {  
900                          data->quant = rc->last_quant[s->type-1] - 2;                  /* Compute the scaled length */
901                          DPRINTF(XVID_DEBUG_RC,                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
902                                          "[%i] p/b-frame quantizer prevented from falling too steeply\n",  
903                                          data->frame_num);                  /* Compare with the computed minimum */
904                    if (len < rc->min_length[s->type-1]) {
905                            /* force frame size to our computed minimum */
906                            s->scaled_length = rc->min_length[s->type-1];
907                            target -= s->scaled_length;
908                            pass1_length -= s->length;
909                    } else {
910                            /* Do nothing for now, we'll scale this later */
911                            s->scaled_length = 0;
912                  }                  }
913          }          }
914    
915          /*          /* Correct the scaler for all non forced frames */
916           * 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;  
         }  
917    
918          return 0;          /* Detect undersizing */
919            if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
920                    DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
921                    scaler = 1.0;
922  }  }
923    
924            DPRINTF(XVID_DEBUG_RC,
925                            "After correction: target=%i, tot_length=%i, scaler=%f\n",
926                            (int)target, (int)pass1_length, scaler);
927    
928            /* Do another pass with the new scaler */
929            for (i=0; i<rc->num_frames; i++) {
930                    stat_t * s = &rc->stats[i];
931    
932                    /* Ignore frame with forced frame sizes */
933                    if (s->scaled_length == 0)
934                            s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
935            }
936    }
937    
938  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  static void
939    pre_process1(rc_2pass2_t * rc)
940  {  {
941      stat_t * s = &rc->stats[data->frame_num];          int i;
942            double total1, total2;
943            uint64_t ivop_boost_total;
944    
945          /* Insufficent stats data */          ivop_boost_total = 0;
946      if (data->frame_num >= rc->num_frames)          rc->curve_comp_error = 0;
         return 0;  
947    
948      rc->quant_count[data->quant]++;          for (i=0; i<3; i++) {
949                    rc->tot_scaled_length[i] = 0;
950            }
951    
952      if (data->type == XVID_TYPE_IVOP) {          for (i=0; i<rc->num_frames; i++) {
953          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  stat_t * s = &rc->stats[i];
954    
955          rc->overflow += rc->KFoverflow;                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
         rc->KFoverflow = s->desired_length - data->length;  
956    
957          if (kfdiff > 1) {  // non-consecutive keyframes                  if (s->type == XVID_TYPE_IVOP) {
958              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;  
959          }          }
         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;  
960      }      }
961    
962      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) /
963          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);  
964    
965      return(0);          for(i=0; i<3; i++) {
966                    if (rc->count[i] == 0 || rc->movie_curve == 0) {
967                            rc->avg_length[i] = 1;
968                    }else{
969                            rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;
970                    }
971  }  }
972    
973    /* --- */
974    
975            total1=total2=0;
976    
977            for (i=0; i<rc->num_frames; i++) {
978                    stat_t * s = &rc->stats[i];
979    
980  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)                  if (s->type != XVID_TYPE_IVOP) {
981  {                          double dbytes,dbytes2;
     switch(opt)  
     {  
     case XVID_PLG_INFO :  
         return 0;  
982    
983      case XVID_PLG_CREATE :                          dbytes = s->scaled_length / rc->movie_curve;
984          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                          dbytes2 = 0; /* XXX: warning */
985                            total1 += dbytes;
986    
987      case XVID_PLG_DESTROY :                          if (dbytes > rc->avg_length[s->type-1]) {
988          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);
989                            } else {
990                                    dbytes2 = ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
991                            }
992    
993      case XVID_PLG_BEFORE :                          if (dbytes2 < rc->min_length[s->type-1])
994          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);                                  dbytes2 = rc->min_length[s->type-1];
995    
996      case XVID_PLG_AFTER :                          total2 += dbytes2;
997          return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);                  }
998      }      }
999    
1000      return XVID_ERR_FAIL;          rc->curve_comp_scale = total1 / total2;
1001    
1002            DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: pframe%d bframe:%d\n",
1003                            (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale),
1004                            (int)(rc->avg_length[XVID_TYPE_BVOP-1] * rc->curve_comp_scale));
1005    
1006            rc->overflow = 0;
1007            rc->KFoverflow = 0;
1008            rc->KFoverflow_partial = 0;
1009            rc->KF_idx = 1;
1010  }  }
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