diff options
Diffstat (limited to 'libavformat/isom.c')
| -rw-r--r-- | libavformat/isom.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/libavformat/isom.c b/libavformat/isom.c index 34404ad022..bf0140103a 100644 --- a/libavformat/isom.c +++ b/libavformat/isom.c @@ -21,9 +21,14 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +//#define DEBUG + #include "avformat.h" #include "internal.h" #include "isom.h" +#include "riff.h" +#include "libavcodec/mpeg4audio.h" +#include "libavcodec/mpegaudiodata.h" /* http://www.mp4ra.org */ /* ordered by muxing preference */ @@ -326,3 +331,79 @@ int ff_mov_lang_to_iso639(unsigned code, char to[4]) memcpy(to, mov_mdhd_language_map[code], 4); return 1; } + +int ff_mp4_read_descr_len(ByteIOContext *pb) +{ + int len = 0; + int count = 4; + while (count--) { + int c = get_byte(pb); + len = (len << 7) | (c & 0x7f); + if (!(c & 0x80)) + break; + } + return len; +} + +int ff_mp4_read_descr(AVFormatContext *fc, ByteIOContext *pb, int *tag) +{ + int len; + *tag = get_byte(pb); + len = ff_mp4_read_descr_len(pb); + dprintf(fc, "MPEG4 description: tag=0x%02x len=%d\n", *tag, len); + return len; +} + +static const AVCodecTag mp4_audio_types[] = { + { CODEC_ID_MP3ON4, AOT_PS }, /* old mp3on4 draft */ + { CODEC_ID_MP3ON4, AOT_L1 }, /* layer 1 */ + { CODEC_ID_MP3ON4, AOT_L2 }, /* layer 2 */ + { CODEC_ID_MP3ON4, AOT_L3 }, /* layer 3 */ + { CODEC_ID_MP4ALS, AOT_ALS }, /* MPEG-4 ALS */ + { CODEC_ID_NONE, AOT_NULL }, +}; + +int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, ByteIOContext *pb) +{ + int len, tag; + int object_type_id = get_byte(pb); + get_byte(pb); /* stream type */ + get_be24(pb); /* buffer size db */ + get_be32(pb); /* max bitrate */ + get_be32(pb); /* avg bitrate */ + + st->codec->codec_id= ff_codec_get_id(ff_mp4_obj_type, object_type_id); + dprintf(fc, "esds object type id 0x%02x\n", object_type_id); + len = ff_mp4_read_descr(fc, pb, &tag); + if (tag == MP4DecSpecificDescrTag) { + dprintf(fc, "Specific MPEG4 header len=%d\n", len); + if((uint64_t)len > (1<<30)) + return -1; + av_free(st->codec->extradata); + st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE); + if (!st->codec->extradata) + return AVERROR(ENOMEM); + get_buffer(pb, st->codec->extradata, len); + st->codec->extradata_size = len; + if (st->codec->codec_id == CODEC_ID_AAC) { + MPEG4AudioConfig cfg; + ff_mpeg4audio_get_config(&cfg, st->codec->extradata, + st->codec->extradata_size); + st->codec->channels = cfg.channels; + if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4 + st->codec->sample_rate = ff_mpa_freq_tab[cfg.sampling_index]; + else if (cfg.ext_sample_rate) + st->codec->sample_rate = cfg.ext_sample_rate; + else + st->codec->sample_rate = cfg.sample_rate; + dprintf(fc, "mp4a config channels %d obj %d ext obj %d " + "sample rate %d ext sample rate %d\n", st->codec->channels, + cfg.object_type, cfg.ext_object_type, + cfg.sample_rate, cfg.ext_sample_rate); + if (!(st->codec->codec_id = ff_codec_get_id(mp4_audio_types, + cfg.object_type))) + st->codec->codec_id = CODEC_ID_AAC; + } + } + return 0; +} |