chan.c

这个库实现了录象功能

    { CHANNEL_LAYOUT_MPEG_6_1_A, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_LFEScreen,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround,
                                                      CHANNEL_LABEL_CenterSurround } },         // L R C LFE Ls Rs Cs

    { CHANNEL_LAYOUT_MPEG_7_1_A, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_LFEScreen,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround,
                                                      CHANNEL_LABEL_LeftCenter,
                                                      CHANNEL_LABEL_RightCenter } }, // L R C LFE Ls Rs Lc Rc
    
    { CHANNEL_LAYOUT_MPEG_5_0_B, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround,
                                                      CHANNEL_LABEL_Center } },         // L R Ls Rs C

    { CHANNEL_LAYOUT_MPEG_5_1_B, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround,
                                                      CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_LFEScreen } },         // L R Ls Rs C LFE

    { CHANNEL_LAYOUT_MPEG_3_0_B,  (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                       CHANNEL_LABEL_Left,
                                                       CHANNEL_LABEL_Right } },        // C L R

    { CHANNEL_LAYOUT_MPEG_4_0_B, (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_CenterSurround } },         // C L R Cs

    { CHANNEL_LAYOUT_MPEG_5_0_D, (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround } },         // C L R Ls Rs

    { CHANNEL_LAYOUT_MPEG_5_1_D, (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround,
                                                      CHANNEL_LABEL_LFEScreen } },         // C L R Ls Rs LFE
    
    { CHANNEL_LAYOUT_MPEG_5_0_C, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround } },         // L C R Ls Rs

    { CHANNEL_LAYOUT_MPEG_5_1_C, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround,
                                                      CHANNEL_LABEL_LFEScreen } },         // L C R Ls Rs LFE

    { CHANNEL_LAYOUT_MPEG_7_1_B, (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_LeftCenter,
                                                      CHANNEL_LABEL_RightCenter,
                                                      CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround,
                                                      CHANNEL_LABEL_LFEScreen  } },         // C Lc Rc L R Ls Rs LFE

    { CHANNEL_LAYOUT_MPEG_7_1_C, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_LFEScreen,
                                                      CHANNEL_LABEL_LeftSurroundDirect,
                                                      CHANNEL_LABEL_RightSurroundDirect,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround  } },         // L R C LFE Ls Rs Rls Rrs

    { CHANNEL_LAYOUT_Emagic_Default_7_1,  (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                               CHANNEL_LABEL_Right,
                                                               CHANNEL_LABEL_LeftSurround,
                                                               CHANNEL_LABEL_RightSurround,
                                                               CHANNEL_LABEL_Center,
                                                               CHANNEL_LABEL_LFEScreen,
                                                               CHANNEL_LABEL_LeftCenter,
                                                               CHANNEL_LABEL_RightCenter } },//  L R Ls Rs C LFE Lc Rc

    { CHANNEL_LAYOUT_SMPTE_DTV,  (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                      CHANNEL_LABEL_Right,
                                                      CHANNEL_LABEL_Center,
                                                      CHANNEL_LABEL_LFEScreen,
                                                      CHANNEL_LABEL_LeftSurround,
                                                      CHANNEL_LABEL_RightSurround,
                                                      CHANNEL_LABEL_LeftTotal,
                                                      CHANNEL_LABEL_RightTotal } },         //  L R C LFE Ls Rs Lt Rt
                                                      //  (CHANNEL_LAYOUT_ITU_5_1 plus a matrix encoded stereo mix)

//  ITU defined layouts

    { CHANNEL_LAYOUT_ITU_2_1, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                   CHANNEL_LABEL_Right,
                                                   CHANNEL_LABEL_CenterSurround } },            // L R Cs

    { CHANNEL_LAYOUT_ITU_2_2, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                   CHANNEL_LABEL_Right,
                                                   CHANNEL_LABEL_LeftSurround,
                                                   CHANNEL_LABEL_RightSurround } },            // L R Ls Rs

// DVD defined layouts

    { CHANNEL_LAYOUT_DVD_4, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                 CHANNEL_LABEL_Right,
                                                 CHANNEL_LABEL_LFEScreen } },              // L R LFE
    { CHANNEL_LAYOUT_DVD_5, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                 CHANNEL_LABEL_Right,
                                                 CHANNEL_LABEL_LFEScreen,
                                                 CHANNEL_LABEL_CenterSurround } },              // L R LFE Cs
    
    { CHANNEL_LAYOUT_DVD_6,  (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                  CHANNEL_LABEL_Right,
                                                  CHANNEL_LABEL_LFEScreen,
                                                  CHANNEL_LABEL_LeftSurround,
                                                  CHANNEL_LABEL_RightSurround } },             // L R LFE Ls Rs
    
    { CHANNEL_LAYOUT_DVD_10, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                  CHANNEL_LABEL_Right,
                                                  CHANNEL_LABEL_Center,
                                                  CHANNEL_LABEL_LFEScreen  } },             // L R C LFE
    
    { CHANNEL_LAYOUT_DVD_11,  (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                   CHANNEL_LABEL_Right,
                                                   CHANNEL_LABEL_Center,
                                                   CHANNEL_LABEL_LFEScreen,
                                                   CHANNEL_LABEL_CenterSurround } },            // L R C LFE Cs
    
    // 13 through 17 are duplicates of 8 through 12.

    { CHANNEL_LAYOUT_DVD_18, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                  CHANNEL_LABEL_Right,
                                                  CHANNEL_LABEL_LeftSurround,
                                                  CHANNEL_LABEL_RightSurround,
                                                  CHANNEL_LABEL_LFEScreen } },             // L R Ls Rs LFE
    
    // These are the surround-based layouts
    
    { CHANNEL_LAYOUT_AudioUnit_6_0, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                         CHANNEL_LABEL_Right,
                                                         CHANNEL_LABEL_LeftSurround,
                                                         CHANNEL_LABEL_RightSurround,
                                                         CHANNEL_LABEL_Center,
                                                         CHANNEL_LABEL_CenterSurround   } },      // L R Ls Rs C Cs

    { CHANNEL_LAYOUT_AudioUnit_7_0, (channel_label_t[]){ CHANNEL_LABEL_Left,
                                                         CHANNEL_LABEL_Right,
                                                         CHANNEL_LABEL_LeftSurroundDirect,
                                                         CHANNEL_LABEL_RightSurroundDirect,
                                                         CHANNEL_LABEL_Center,
                                                         CHANNEL_LABEL_LeftSurround,
                                                         CHANNEL_LABEL_RightSurround } },      // L R Ls Rs C Rls Rrs

// These layouts are used for AAC Encoding within the MPEG-4 Specification

    { CHANNEL_LAYOUT_AAC_6_0, (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                   CHANNEL_LABEL_Left,
                                                   CHANNEL_LABEL_Right,
                                                   CHANNEL_LABEL_LeftSurround,
                                                   CHANNEL_LABEL_RightSurround,
                                                   CHANNEL_LABEL_CenterSurround  } },            // C L R Ls Rs Cs

    { CHANNEL_LAYOUT_AAC_6_1, (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                   CHANNEL_LABEL_Left,
                                                   CHANNEL_LABEL_Right,
                                                   CHANNEL_LABEL_LeftSurround,
                                                   CHANNEL_LABEL_RightSurround,
                                                   CHANNEL_LABEL_CenterSurround,
                                                   CHANNEL_LABEL_LFEScreen  } },            // C L R Ls Rs Cs Lfe

    { CHANNEL_LAYOUT_AAC_7_0, (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                   CHANNEL_LABEL_Left,
                                                   CHANNEL_LABEL_Right,
                                                   CHANNEL_LABEL_LeftSurroundDirect,
                                                   CHANNEL_LABEL_RightSurroundDirect,
                                                   CHANNEL_LABEL_LeftSurround,
                                                   CHANNEL_LABEL_RightSurround  } },            // C L R Ls Rs Rls Rrs
    
    { CHANNEL_LAYOUT_AAC_Octagonal, (channel_label_t[]){ CHANNEL_LABEL_Center,
                                                         CHANNEL_LABEL_Left,
                                                         CHANNEL_LABEL_Right,
                                                         CHANNEL_LABEL_LeftSurroundDirect,
                                                         CHANNEL_LABEL_RightSurroundDirect,
                                                         CHANNEL_LABEL_LeftSurround,
                                                         CHANNEL_LABEL_RightSurround,
                                                         CHANNEL_LABEL_CenterSurround  } },      // C L R Ls Rs Rls Rrs Cs
    
    /* No, sorry the following 2 a to weird. The one who has such files, can program it */
    //    { CHANNEL_LAYOUT_TMH_10_2_std, (channel_label_t[]){  } },       // L R C Vhc Lsd Rsd Ls Rs Vhl Vhr Lw Rw Csd Cs LFE1 LFE2
    //    { CHANNEL_LAYOUT_TMH_10_2_full, (channel_label_t[]){  } },      // TMH_10_2_std plus: Lc Rc HI VI Haptic
      
  };

static channel_label_t * get_channel_locations(uint32_t layout, int * num_channels)
  {
  int i;

  *num_channels = layout & 0xffff;
  for(i = 0; i < sizeof(channel_locations)/sizeof(channel_locations[0]); i++)
    {
    if(channel_locations[i].layout == layout)
      {
      return channel_locations[i].channels;
      }
    }
  return (channel_label_t*)0;
  }

void quicktime_chan_init(quicktime_chan_t *chan)
  {

  }

void quicktime_chan_delete(quicktime_chan_t *chan)
  {
  if(chan->ChannelDescriptions)
    free(chan->ChannelDescriptions);
  }

void quicktime_chan_dump(quicktime_chan_t *chan)
  {
  channel_label_t * channel_labels;
  int num_channels;
  int i, j;
  uint32_t mask;
  lqt_dump("       channel description\n");
  lqt_dump("        version                     %d\n", chan->version);
  lqt_dump("        flags                       %ld\n", chan->flags);
  lqt_dump("        mChannelLayoutTag:          0x%08x", chan->mChannelLayoutTag);

  if(chan->mChannelLayoutTag == CHANNEL_LAYOUT_UseChannelDescriptions)
    {
    lqt_dump(" [Use channel decriptions]\n");
    }
  else if(chan->mChannelLayoutTag == CHANNEL_LAYOUT_UseChannelBitmap)
    {
    lqt_dump(" [Use channel bitmap]\n");
    }
  else
    {
    channel_labels = get_channel_locations(chan->mChannelLayoutTag, &num_channels);
    
    lqt_dump(" [");

    if(channel_labels)
      {
      for(i = 0; i < num_channels; i++)