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Diff of /xvidcore/src/plugins/plugin_2pass2.c

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revision 1.4, Fri Jun 11 08:44:30 2004 UTC revision 1.5, Sat Jun 12 13:53:19 2004 UTC
# Line 35  Line 35 
35  /* forces second pass not to be bigger than first */  /* forces second pass not to be bigger than first */
36  #undef PASS_SMALLER  #undef PASS_SMALLER
37    
38  /* automtically alters overflow controls (strength and improvement/degradation)  /* automatically alters overflow controls (strength and improvement/degradation)
39          to fight most common problems without user's knowladge */          to fight most common problems without user's knowladge */
40  #define SMART_OVERFLOW_SETTING  #define SMART_OVERFLOW_SETTING
41    
# Line 453  Line 453 
453          scaled_curve_apply_advanced_parameters(rc);          scaled_curve_apply_advanced_parameters(rc);
454    
455  /* Check curve for VBV compliancy and rescale if necessary */  /* Check curve for VBV compliancy and rescale if necessary */
   
456  #ifdef VBV_FORCE  #ifdef VBV_FORCE
457    if (rc->param.vbv_size==0)          if (rc->param.vbv_size==0) {
   {  
458      rc->param.vbv_size      =  3145728;      rc->param.vbv_size      =  3145728;
459      rc->param.vbv_initial   =  2359296;      rc->param.vbv_initial   =  2359296;
460      rc->param.vbv_maxrate  =  4000000;      rc->param.vbv_maxrate  =  4000000;
# Line 464  Line 462 
462    }    }
463  #endif  #endif
464    
465    if (rc->param.vbv_size>0)    /* vbv_size==0 switches VBV check off */          /* vbv_size==0 switches VBV check off */
466    {          if (rc->param.vbv_size > 0)  {
467      const double fps = (double)create->fbase/(double)create->fincr;      const double fps = (double)create->fbase/(double)create->fincr;
468      int status = check_curve_for_vbv_compliancy(rc, fps);      int status = check_curve_for_vbv_compliancy(rc, fps);
469  #ifdef VBV_DEBUG  
470      if (status)                  if (status) {
471        fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... ");                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Underflow detected - Scaling Curve for compliancy.\n");
472  #endif                  }
473    
474          status = scale_curve_for_vbv_compliancy(rc, fps);          status = scale_curve_for_vbv_compliancy(rc, fps);
475    
476  #ifdef VBV_DEBUG                  if (status == 0) {
477        if (status==0)                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling done.\n");
478          fprintf(stderr,"done.\n");                  } else {
479        else                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling impossible.\n");
480          fprintf(stderr,"impossible.\n");                  }
 #endif  
481    }    }
482          *handle = rc;          *handle = rc;
483          return(0);          return(0);
# Line 1455  Line 1452 
1452  #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */  #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1453  #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */  #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1454    
1455  static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)  static int
1456    check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1457  {  {
1458  /* We do all calculations in float, for higher accuracy,  /* We do all calculations in float, for higher accuracy,
1459     and in bytes for convenience           * and in bytes for convenience.
1460             *
1461     typical values from DivX Home Theater profile:           * typical values from DivX Home Theater profile:
1462     vbv_size= 384*1024 (384kB), vbv_initial= 288*1024 (75% fill)           *  vbv_size= 384*1024 (384kB)
1463     maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps)           *  vbv_initial= 288*1024 (75% fill)
1464             *  maxrate= 4000000 (4MBps)
1465     PAL: offset3s = 75 (3 seconds of 25fps)           *  peakrate= 10000000 (10MBps)
1466     NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)           *
1467             *  PAL: offset3s = 75 (3 seconds of 25fps)
1468             *  NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1469  */  */
1470    
1471    const float vbv_size = (float)rc->param.vbv_size/8.f;    const float vbv_size = (float)rc->param.vbv_size/8.f;
1472    float vbvfill = (float)rc->param.vbv_initial/8.f;    float vbvfill = (float)rc->param.vbv_initial/8.f;
1473            float vbvmin;
1474    
1475    const float maxrate = (float)rc->param.vbv_maxrate;    const float maxrate = (float)rc->param.vbv_maxrate;
1476    const float peakrate = (float)rc->param.vbv_peakrate;    const float peakrate = (float)rc->param.vbv_peakrate;
# Line 1477  Line 1478 
1478    
1479    int bytes3s = 0;    int bytes3s = 0;
1480    int offset3s = (int)(3.f*fps+0.5);    int offset3s = (int)(3.f*fps+0.5);
   
1481    int i;    int i;
1482    
1483            /* 1Gbit should be enough to inuitialize the vbvmin
1484             *      an arbitrary high value */
1485            vbvmin = 1000*1000*1000;
1486    
1487    for (i=0; i<rc->num_frames; i++) {    for (i=0; i<rc->num_frames; i++) {
1488  /* DivX 3s peak bitrate check  */  /* DivX 3s peak bitrate check  */
   
1489      bytes3s += rc->stats[i].scaled_length;      bytes3s += rc->stats[i].scaled_length;
1490      if (i>=offset3s)      if (i>=offset3s)
1491        bytes3s -= rc->stats[i-offset3s].scaled_length;        bytes3s -= rc->stats[i-offset3s].scaled_length;
1492    
1493      if (8.f*bytes3s > 3*peakrate)      if (8.f*bytes3s > 3*peakrate)
1494        return VBV_PEAKRATE;                          return(VBV_PEAKRATE);
1495    
1496  /* update vbv fill level */  /* update vbv fill level */
   
1497      vbvfill += r0 - rc->stats[i].scaled_length;      vbvfill += r0 - rc->stats[i].scaled_length;
1498    
1499  /* this check is _NOT_ an "overflow"! only reading from disk stops then */  /* this check is _NOT_ an "overflow"! only reading from disk stops then */
# Line 1499  Line 1502 
1502    
1503  /* but THIS would be an underflow. report it! */  /* but THIS would be an underflow. report it! */
1504      if (vbvfill < 0)      if (vbvfill < 0)
1505        return VBV_UNDERFLOW;                          return(VBV_UNDERFLOW);
1506    
1507                    /* Store the minimum buffer filling */
1508                    if (vbvfill < vbvmin)
1509                            vbvmin = vbvfill;
1510    }    }
1511    
1512    return VBV_COMPLIANT;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Minimum buffer fill: %f bytes\n", vbvmin);
1513    
1514            return(VBV_COMPLIANT);
1515  }  }
 /* TODO: store min(vbvfill) and print "minimum buffer fill" */  
1516    
1517    
1518  static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)  static int
1519    scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1520  {  {
1521  /* correct any VBV violations. Peak bitrate violations disappears  /* correct any VBV violations. Peak bitrate violations disappears
1522     by this automatically           * by this automatically
1523             *
1524     This implementation follows           * This implementation follows
1525             *
1526     Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"           * Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1527     IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488           * IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1528             *
1529     Thanks, guys! This paper rocks!!!           * Thanks, guys! This paper rocks!!! */
 */  
   
 /*  
     For each scene of len N, we have to check up to N^2 possible buffer fills.  
     This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a  
     little slow...  
1530    
1531      TODO: Better control on VBVfill between scenes          /* For each scene of len N, we have to check up to N^2 possible buffer fills.
1532  */           * This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1533             * little slow...
1534             *
1535             * TODO: Better control on VBVfill between scenes */
1536    
1537    const float vbv_size = (float)rc->param.vbv_size/8.f;    const float vbv_size = (float)rc->param.vbv_size/8.f;
1538    const float vbv_initial = (float)rc->param.vbv_initial/8.f;    const float vbv_initial = (float)rc->param.vbv_initial/8.f;
# Line 1540  Line 1546 
1546    int *scenestart;    int *scenestart;
1547    int *scenelength;    int *scenelength;
1548    
1549  /* first step: determine how many "scenes" there are and store their boundaries          /* first step: determine how many "scenes" there are and store their
1550     we could get all this from existing keyframe_positions, somehow, but there we           * boundaries we could get all this from existing keyframe_positions,
1551     don't have a min_scenelength, and it's no big deal to get it again.  */           * somehow, but there we don't have a min_scenelength, and it's no big
1552             * deal to get it again. */
1553    
1554    const int min_scenelength = (int)(fps+0.5);    const int min_scenelength = (int)(fps+0.5);
1555    int num_scenes = 0;    int num_scenes = 0;
1556    int last_scene = -999;    int last_scene = -999;
1557    for (i=0; i<rc->num_frames; i++) {    for (i=0; i<rc->num_frames; i++) {
1558      if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )                  if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
     {  
1559        last_scene = i;        last_scene = i;
1560        num_scenes++;        num_scenes++;
1561      }      }
# Line 1559  Line 1565 
1565    scenestart = (int*)malloc( num_scenes*sizeof(int) );    scenestart = (int*)malloc( num_scenes*sizeof(int) );
1566    scenelength = (int*)malloc( num_scenes*sizeof(int) );    scenelength = (int*)malloc( num_scenes*sizeof(int) );
1567    
1568    if ((!scenefactor) || (!scenestart) || (!scenelength) )          if ((!scenefactor) || (!scenestart) || (!scenelength) ) {
   {  
1569      free(scenefactor);      free(scenefactor);
1570      free(scenestart);      free(scenestart);
1571      free(scenelength);      free(scenelength);
1572      /* remember: free(0) is valid and does exactly nothing. */      /* remember: free(0) is valid and does exactly nothing. */
1573      return -1;                  return(-1);
1574    }    }
1575    
1576  /* count again and safe the length/position */  /* count again and safe the length/position */
# Line 1573  Line 1578 
1578    num_scenes = 0;    num_scenes = 0;
1579    last_scene = -999;    last_scene = -999;
1580    for (i=0; i<rc->num_frames; i++) {    for (i=0; i<rc->num_frames; i++) {
1581      if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )                  if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1582      {                          if (num_scenes>0) {
       if (num_scenes>0)  
1583          scenelength[num_scenes-1]=i-last_scene;          scenelength[num_scenes-1]=i-last_scene;
1584                            }
1585        scenestart[num_scenes]=i;        scenestart[num_scenes]=i;
1586        num_scenes++;        num_scenes++;
1587        last_scene = i;        last_scene = i;
# Line 1584  Line 1589 
1589    }    }
1590    scenelength[num_scenes-1]=i-last_scene;    scenelength[num_scenes-1]=i-last_scene;
1591    
1592  /* second step: check for each scene, how much we can scale its frames up or down          /* second step: check for each scene, how much we can scale its frames up or
1593     such that the VBV restriction is just fulfilled           * down such that the VBV restriction is just fulfilled */
 */  
   
   
1594  #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */  #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1595    for (l=0; l<num_scenes;l++)          for (l=0; l<num_scenes;l++) {
   {  
1596      const int start = scenestart[l];      const int start = scenestart[l];
1597      const int length = scenelength[l];      const int length = scenelength[l];
1598      twopass_stat_t * frames = &rc->stats[start];      twopass_stat_t * frames = &rc->stats[start];
# Line 1600  Line 1601 
1601      float f,minf = 99999.f;      float f,minf = 99999.f;
1602    
1603      S0n=0.;      S0n=0.;
1604      for (n=0;n<=length-1;n++)                  for (n=0;n<=length-1;n++) {
     {  
1605        S0n += frames[n].scaled_length;        S0n += frames[n].scaled_length;
1606    
1607        k=0;        k=0;
# Line 1610  Line 1610 
1610        if (f < minf)        if (f < minf)
1611          minf = f;          minf = f;
1612    
1613        for (k=1;k<=n;k++)                          for (k=1;k<=n;k++) {
       {  
1614          Skn -= frames[k].scaled_length;          Skn -= frames[k].scaled_length;
1615    
1616          f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;          f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
# Line 1621  Line 1620 
1620      }      }
1621    
1622      /* special case: at the end, fill buffer up to vbv_initial again      /* special case: at the end, fill buffer up to vbv_initial again
1623         TODO: Allow other values for buffer fill between scenes                   *
1624         e.g. if n=N is smallest f-value, then check for better value */                   * TODO: Allow other values for buffer fill between scenes
1625                     * e.g. if n=N is smallest f-value, then check for better value */
1626    
1627      n=length;      n=length;
1628      k=0;      k=0;
# Line 1631  Line 1631 
1631      if (f < minf)      if (f < minf)
1632        minf = f;        minf = f;
1633    
1634      for (k=1;k<=n-1;k++)                  for (k=1;k<=n-1;k++) {
     {  
1635        Skn -= frames[k].scaled_length;        Skn -= frames[k].scaled_length;
1636    
1637        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
# Line 1640  Line 1639 
1639          minf = f;          minf = f;
1640      }      }
1641    
1642  #ifdef VBV_DEBUG                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] Scene %d (Frames %d-%d): VBVfactor %f\n",
1643      printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);                                  l, start, start+length-1 , minf);
 #endif  
1644    
1645      scenefactor[l] = minf;      scenefactor[l] = minf;
1646    }    }
1647  #undef R  #undef R
1648    
1649  /* last step: now we know of any scene how much it can be scaled up or down without          /* last step: now we know of any scene how much it can be scaled up or down
1650     violating VBV. Next, distribute bits from the evil scenes to the good ones */           * without violating VBV. Next, distribute bits from the evil scenes to the
1651             * good ones */
1652    do          do {
   {  
1653      float S_red = 0.f;    /* how much to redistribute */      float S_red = 0.f;    /* how much to redistribute */
1654      float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/      float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1655          float f_red;          float f_red;
1656      int l;      int l;
1657    
1658      for (l=0;l<num_scenes;l++)   /* check how much is wrong */                  /* check how much is wrong */
1659      {                  for (l=0;l<num_scenes;l++) {
1660      const int start = scenestart[l];      const int start = scenestart[l];
1661      const int length = scenelength[l];      const int length = scenelength[l];
1662      twopass_stat_t * frames = &rc->stats[start];      twopass_stat_t * frames = &rc->stats[start];
1663    
1664        if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */                          /* exactly 1 means "don't touch this anymore!" */
1665                            if (scenefactor[l] == 1.)
1666          continue;          continue;
1667    
1668        if (scenefactor[l] > 1.) /* within limits */                          /* within limits */
1669        {                          if (scenefactor[l] > 1.) {
1670          for (n= 0; n < length; n++)          for (n= 0; n < length; n++)
1671            S_elig += frames[n].scaled_length;            S_elig += frames[n].scaled_length;
1672        }                          } else {
1673        else /* underflowing segment */                                  /* underflowing segment */
1674        {                                  for (n= 0; n < length; n++) {
         for (n= 0; n < length; n++)  
         {  
1675            float newbytes = (float)frames[n].scaled_length * scenefactor[l];            float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1676            S_red += (float)frames[n].scaled_length - (float)newbytes;            S_red += (float)frames[n].scaled_length - (float)newbytes;
1677            frames[n].scaled_length =(int)newbytes;            frames[n].scaled_length =(int)newbytes;
# Line 1684  Line 1680 
1680        }        }
1681      }      }
1682    
1683      if (S_red < 1.f)   /* no more underflows */                  /* no more underflows */
1684                    if (S_red < 1.f)
1685        break;        break;
1686    
1687      if (S_elig < 1.f)                  if (S_elig < 1.f) {
1688      {                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Everything underflowing.\n");
 #ifdef VBV_DEBUG  
       fprintf(stderr,"Everything underflowing. \n");  
 #endif  
1689        free(scenefactor);        free(scenefactor);
1690        free(scenestart);        free(scenestart);
1691        free(scenelength);        free(scenelength);
1692        return -2;                          return(-2);
1693      }      }
1694    
1695      f_red = (1.f + S_red/S_elig);      f_red = (1.f + S_red/S_elig);
1696    
1697  #ifdef VBV_DEBUG                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",
1698      printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red);                                  S_red/1024.f, f_red);
 #endif  
1699    
1700      violation=0;      violation=0;
1701      for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */                  /* scale remaining scenes up to meet total size */
1702      {                  for (l=0; l<num_scenes; l++) {
1703        const int start = scenestart[l];        const int start = scenestart[l];
1704        const int length = scenelength[l];        const int length = scenelength[l];
1705        twopass_stat_t * frames = &rc->stats[start];        twopass_stat_t * frames = &rc->stats[start];
# Line 1715  Line 1708 
1708          continue;          continue;
1709    
1710        /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */        /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1711                            for (n= 0; n < length; n++) {
       for (n= 0; n < length; n++)  
       {  
1712          frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);          frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1713        }        }
1714    
# Line 1731  Line 1722 
1722    free(scenefactor);    free(scenefactor);
1723    free(scenestart);    free(scenestart);
1724    free(scenelength);    free(scenelength);
1725    return 0;          return(0);
1726  }  }
1727    
1728    
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