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revision 1471, Fri Jun 11 08:44:30 2004 UTC revision 1607, Sun Mar 27 03:59:42 2005 UTC
# Line 25  Line 25 
25   *  along with this program; if not, write to the Free Software   *  along with this program; if not, write to the Free Software
26   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
27   *   *
28   * $Id: plugin_2pass2.c,v 1.4 2004-06-11 08:44:30 suxen_drol Exp $   * $Id: plugin_2pass2.c,v 1.7 2005-03-27 03:59:42 suxen_drol Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
# 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   =  4854000;
461      rc->param.vbv_peakrate = 10000000;                  rc->param.vbv_peakrate  =  8000000;
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 860  Line 857 
857                  rc->KFoverflow -= rc->KFoverflow_partial;                  rc->KFoverflow -= rc->KFoverflow_partial;
858          }          }
859    
860          rc->overflow += (s->error = s->desired_length - data->length);          s->error = s->desired_length - data->length;
861          rc->real_total += data->length;          rc->real_total += data->length;
862    
863          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n",
# 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= 4854000 (4.854MBps)
1465     PAL: offset3s = 75 (3 seconds of 25fps)           *  peakrate= 8000000 (8MBps)
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)      /* ignore peakrate constraint if peakrate is <= 0.f */
1494        return VBV_PEAKRATE;                  if (peakrate>0.f && 8.f*bytes3s > 3*peakrate)
1495                            return(VBV_PEAKRATE);
1496    
1497  /* update vbv fill level */  /* update vbv fill level */
   
1498      vbvfill += r0 - rc->stats[i].scaled_length;      vbvfill += r0 - rc->stats[i].scaled_length;
1499    
1500  /* 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 1503 
1503    
1504  /* but THIS would be an underflow. report it! */  /* but THIS would be an underflow. report it! */
1505      if (vbvfill < 0)      if (vbvfill < 0)
1506        return VBV_UNDERFLOW;                          return(VBV_UNDERFLOW);
1507    
1508                    /* Store the minimum buffer filling */
1509                    if (vbvfill < vbvmin)
1510                            vbvmin = vbvfill;
1511    }    }
1512    
1513    return VBV_COMPLIANT;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Minimum buffer fill: %f bytes\n", vbvmin);
1514    
1515            return(VBV_COMPLIANT);
1516  }  }
 /* TODO: store min(vbvfill) and print "minimum buffer fill" */  
1517    
1518    
1519  static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)  static int
1520    scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1521  {  {
1522  /* correct any VBV violations. Peak bitrate violations disappears  /* correct any VBV violations. Peak bitrate violations disappears
1523     by this automatically           * by this automatically
1524             *
1525     This implementation follows           * This implementation follows
1526             *
1527     Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"           * Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1528     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
1529             *
1530     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...  
1531    
1532      TODO: Better control on VBVfill between scenes          /* For each scene of len N, we have to check up to N^2 possible buffer fills.
1533  */           * This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1534             * little slow...
1535             *
1536             * TODO: Better control on VBVfill between scenes */
1537    
1538    const float vbv_size = (float)rc->param.vbv_size/8.f;    const float vbv_size = (float)rc->param.vbv_size/8.f;
1539    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 1547 
1547    int *scenestart;    int *scenestart;
1548    int *scenelength;    int *scenelength;
1549    
1550  /* first step: determine how many "scenes" there are and store their boundaries          /* first step: determine how many "scenes" there are and store their
1551     we could get all this from existing keyframe_positions, somehow, but there we           * boundaries we could get all this from existing keyframe_positions,
1552     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
1553             * deal to get it again. */
1554    
1555    const int min_scenelength = (int)(fps+0.5);    const int min_scenelength = (int)(fps+0.5);
1556    int num_scenes = 0;    int num_scenes = 0;
1557    int last_scene = -999;    int last_scene = -999;
1558    for (i=0; i<rc->num_frames; i++) {    for (i=0; i<rc->num_frames; i++) {
1559      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)) {
     {  
1560        last_scene = i;        last_scene = i;
1561        num_scenes++;        num_scenes++;
1562      }      }
# Line 1559  Line 1566 
1566    scenestart = (int*)malloc( num_scenes*sizeof(int) );    scenestart = (int*)malloc( num_scenes*sizeof(int) );
1567    scenelength = (int*)malloc( num_scenes*sizeof(int) );    scenelength = (int*)malloc( num_scenes*sizeof(int) );
1568    
1569    if ((!scenefactor) || (!scenestart) || (!scenelength) )          if ((!scenefactor) || (!scenestart) || (!scenelength) ) {
   {  
1570      free(scenefactor);      free(scenefactor);
1571      free(scenestart);      free(scenestart);
1572      free(scenelength);      free(scenelength);
1573      /* remember: free(0) is valid and does exactly nothing. */      /* remember: free(0) is valid and does exactly nothing. */
1574      return -1;                  return(-1);
1575    }    }
1576    
1577  /* count again and safe the length/position */  /* count again and safe the length/position */
# Line 1573  Line 1579 
1579    num_scenes = 0;    num_scenes = 0;
1580    last_scene = -999;    last_scene = -999;
1581    for (i=0; i<rc->num_frames; i++) {    for (i=0; i<rc->num_frames; i++) {
1582      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)) {
1583      {                          if (num_scenes>0) {
       if (num_scenes>0)  
1584          scenelength[num_scenes-1]=i-last_scene;          scenelength[num_scenes-1]=i-last_scene;
1585                            }
1586        scenestart[num_scenes]=i;        scenestart[num_scenes]=i;
1587        num_scenes++;        num_scenes++;
1588        last_scene = i;        last_scene = i;
# Line 1584  Line 1590 
1590    }    }
1591    scenelength[num_scenes-1]=i-last_scene;    scenelength[num_scenes-1]=i-last_scene;
1592    
1593  /* 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
1594     such that the VBV restriction is just fulfilled           * down such that the VBV restriction is just fulfilled */
 */  
   
   
1595  #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 */
1596    for (l=0; l<num_scenes;l++)          for (l=0; l<num_scenes;l++) {
   {  
1597      const int start = scenestart[l];      const int start = scenestart[l];
1598      const int length = scenelength[l];      const int length = scenelength[l];
1599      twopass_stat_t * frames = &rc->stats[start];      twopass_stat_t * frames = &rc->stats[start];
# Line 1600  Line 1602 
1602      float f,minf = 99999.f;      float f,minf = 99999.f;
1603    
1604      S0n=0.;      S0n=0.;
1605      for (n=0;n<=length-1;n++)                  for (n=0;n<=length-1;n++) {
     {  
1606        S0n += frames[n].scaled_length;        S0n += frames[n].scaled_length;
1607    
1608        k=0;        k=0;
# Line 1610  Line 1611 
1611        if (f < minf)        if (f < minf)
1612          minf = f;          minf = f;
1613    
1614        for (k=1;k<=n;k++)                          for (k=1;k<=n;k++) {
       {  
1615          Skn -= frames[k].scaled_length;          Skn -= frames[k].scaled_length;
1616    
1617          f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;          f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
# Line 1621  Line 1621 
1621      }      }
1622    
1623      /* special case: at the end, fill buffer up to vbv_initial again      /* special case: at the end, fill buffer up to vbv_initial again
1624         TODO: Allow other values for buffer fill between scenes                   *
1625         e.g. if n=N is smallest f-value, then check for better value */                   * TODO: Allow other values for buffer fill between scenes
1626                     * e.g. if n=N is smallest f-value, then check for better value */
1627    
1628      n=length;      n=length;
1629      k=0;      k=0;
# Line 1631  Line 1632 
1632      if (f < minf)      if (f < minf)
1633        minf = f;        minf = f;
1634    
1635      for (k=1;k<=n-1;k++)                  for (k=1;k<=n-1;k++) {
     {  
1636        Skn -= frames[k].scaled_length;        Skn -= frames[k].scaled_length;
1637    
1638        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
# Line 1640  Line 1640 
1640          minf = f;          minf = f;
1641      }      }
1642    
1643  #ifdef VBV_DEBUG                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] Scene %d (Frames %d-%d): VBVfactor %f\n",
1644      printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);                                  l, start, start+length-1 , minf);
 #endif  
1645    
1646      scenefactor[l] = minf;      scenefactor[l] = minf;
1647    }    }
1648  #undef R  #undef R
1649    
1650  /* 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
1651     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
1652             * good ones */
1653    do          do {
   {  
1654      float S_red = 0.f;    /* how much to redistribute */      float S_red = 0.f;    /* how much to redistribute */
1655      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*/
1656          float f_red;          float f_red;
1657      int l;      int l;
1658    
1659      for (l=0;l<num_scenes;l++)   /* check how much is wrong */                  /* check how much is wrong */
1660      {                  for (l=0;l<num_scenes;l++) {
1661      const int start = scenestart[l];      const int start = scenestart[l];
1662      const int length = scenelength[l];      const int length = scenelength[l];
1663      twopass_stat_t * frames = &rc->stats[start];      twopass_stat_t * frames = &rc->stats[start];
1664    
1665        if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */                          /* exactly 1 means "don't touch this anymore!" */
1666                            if (scenefactor[l] == 1.)
1667          continue;          continue;
1668    
1669        if (scenefactor[l] > 1.) /* within limits */                          /* within limits */
1670        {                          if (scenefactor[l] > 1.) {
1671          for (n= 0; n < length; n++)          for (n= 0; n < length; n++)
1672            S_elig += frames[n].scaled_length;            S_elig += frames[n].scaled_length;
1673        }                          } else {
1674        else /* underflowing segment */                                  /* underflowing segment */
1675        {                                  for (n= 0; n < length; n++) {
         for (n= 0; n < length; n++)  
         {  
1676            float newbytes = (float)frames[n].scaled_length * scenefactor[l];            float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1677            S_red += (float)frames[n].scaled_length - (float)newbytes;            S_red += (float)frames[n].scaled_length - (float)newbytes;
1678            frames[n].scaled_length =(int)newbytes;            frames[n].scaled_length =(int)newbytes;
# Line 1684  Line 1681 
1681        }        }
1682      }      }
1683    
1684      if (S_red < 1.f)   /* no more underflows */                  /* no more underflows */
1685                    if (S_red < 1.f)
1686        break;        break;
1687    
1688      if (S_elig < 1.f)                  if (S_elig < 1.f) {
1689      {                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Everything underflowing.\n");
 #ifdef VBV_DEBUG  
       fprintf(stderr,"Everything underflowing. \n");  
 #endif  
1690        free(scenefactor);        free(scenefactor);
1691        free(scenestart);        free(scenestart);
1692        free(scenelength);        free(scenelength);
1693        return -2;                          return(-2);
1694      }      }
1695    
1696      f_red = (1.f + S_red/S_elig);      f_red = (1.f + S_red/S_elig);
1697    
1698  #ifdef VBV_DEBUG                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",
1699      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  
1700    
1701      violation=0;      violation=0;
1702      for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */                  /* scale remaining scenes up to meet total size */
1703      {                  for (l=0; l<num_scenes; l++) {
1704        const int start = scenestart[l];        const int start = scenestart[l];
1705        const int length = scenelength[l];        const int length = scenelength[l];
1706        twopass_stat_t * frames = &rc->stats[start];        twopass_stat_t * frames = &rc->stats[start];
# Line 1715  Line 1709 
1709          continue;          continue;
1710    
1711        /* 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 */
1712                            for (n= 0; n < length; n++) {
       for (n= 0; n < length; n++)  
       {  
1713          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);
1714        }        }
1715    
# Line 1731  Line 1723 
1723    free(scenefactor);    free(scenefactor);
1724    free(scenestart);    free(scenestart);
1725    free(scenelength);    free(scenelength);
1726    return 0;          return(0);
1727  }  }
1728    
1729    
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