diff options
Diffstat (limited to 'libavformat/isom.c')
| -rw-r--r-- | libavformat/isom.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/libavformat/isom.c b/libavformat/isom.c index 3246df889f..6ab996c45b 100644 --- a/libavformat/isom.c +++ b/libavformat/isom.c @@ -420,3 +420,63 @@ int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext } return 0; } + +typedef struct MovChannelLayout { + int64_t channel_layout; + uint32_t layout_tag; +} MovChannelLayout; + +static const MovChannelLayout mov_channel_layout[] = { + { AV_CH_LAYOUT_MONO, (100<<16) | 1}, //< kCAFChannelLayoutTag_Mono + { AV_CH_LAYOUT_STEREO, (101<<16) | 2}, //< kCAFChannelLayoutTag_Stereo + { AV_CH_LAYOUT_STEREO, (102<<16) | 2}, //< kCAFChannelLayoutTag_StereoHeadphones + { AV_CH_LAYOUT_2_1, (131<<16) | 3}, //< kCAFChannelLayoutTag_ITU_2_1 + { AV_CH_LAYOUT_QUAD, (132<<16) | 4}, //< kCAFChannelLayoutTag_ITU_2_2 + { AV_CH_LAYOUT_2_2, (132<<16) | 4}, //< kCAFChannelLayoutTag_ITU_2_2 + { AV_CH_LAYOUT_QUAD, (108<<16) | 4}, //< kCAFChannelLayoutTag_Quadraphonic + { AV_CH_LAYOUT_SURROUND, (113<<16) | 3}, //< kCAFChannelLayoutTag_MPEG_3_0_A + { AV_CH_LAYOUT_4POINT0, (115<<16) | 4}, //< kCAFChannelLayoutTag_MPEG_4_0_A + { AV_CH_LAYOUT_5POINT0_BACK, (117<<16) | 5}, //< kCAFChannelLayoutTag_MPEG_5_0_A + { AV_CH_LAYOUT_5POINT0, (117<<16) | 5}, //< kCAFChannelLayoutTag_MPEG_5_0_A + { AV_CH_LAYOUT_5POINT1_BACK, (121<<16) | 6}, //< kCAFChannelLayoutTag_MPEG_5_1_A + { AV_CH_LAYOUT_5POINT1, (121<<16) | 6}, //< kCAFChannelLayoutTag_MPEG_5_1_A + { AV_CH_LAYOUT_7POINT1, (128<<16) | 8}, //< kCAFChannelLayoutTag_MPEG_7_1_C + { AV_CH_LAYOUT_7POINT1_WIDE, (126<<16) | 8}, //< kCAFChannelLayoutTag_MPEG_7_1_A + { AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, (133<<16) | 3}, //< kCAFChannelLayoutTag_DVD_4 + { AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY, (134<<16) | 4}, //< kCAFChannelLayoutTag_DVD_5 + { AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, (135<<16) | 4}, //< kCAFChannelLayoutTag_DVD_6 + { AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY, (135<<16) | 4}, //< kCAFChannelLayoutTag_DVD_6 + { AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, (136<<16) | 4}, //< kCAFChannelLayoutTag_DVD_10 + { AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, (137<<16) | 5}, //< kCAFChannelLayoutTag_DVD_11 + { 0, 0}, +}; + +void ff_mov_read_chan(AVFormatContext *s, int64_t size, AVCodecContext *codec) +{ + uint32_t layout_tag; + AVIOContext *pb = s->pb; + const MovChannelLayout *layouts = mov_channel_layout; + if (size != 12) { + // Channel descriptions not implemented + av_log_ask_for_sample(s, "Unimplemented channel layout.\n"); + avio_skip(pb, size); + return; + } + layout_tag = avio_rb32(pb); + if (layout_tag == 0x10000) { //< kCAFChannelLayoutTag_UseChannelBitmap + codec->channel_layout = avio_rb32(pb); + avio_skip(pb, 4); + return; + } + while (layouts->channel_layout) { + if (layout_tag == layouts->layout_tag) { + codec->channel_layout = layouts->channel_layout; + break; + } + layouts++; + } + if (!codec->channel_layout) + av_log(s, AV_LOG_WARNING, "Unknown channel layout.\n"); + avio_skip(pb, 8); +} + |