ffmpeg当前版本mp4容器 支持G711修改
1，编译脚本设置编译参数
#支持PCM和G711编解码 --enable-encoder=pcm_alaw --enable-decoder=pcm_alaw
#–enable-demuxer=mov 支持mov,mp4,m4a,3gp,3g2,mj2解复用 configure_flags="–enable-cross-compile --disable-debug
–disable-programs --disable-doc --enable-pic --enable-encoder=pcm_alaw --enable-decoder=pcm_alaw --enable-demuxer=mov"
2，修改 ffmpeg libavformat 的代码
ffmpeg当前版本mp4容器不支持G711。因此做了源代码修改。详见libavformat/movenc.c
1051行(mov_write_audio_tag函数内部)
1585行(mov_find_codec_tag函数内部)
static int mov_write_audio_tag(AVFormatContext *s, AVIOContext *pb,
MOVMuxContext *mov, MOVTrack *track) {
int64_t pos = avio_tell(pb);
int version = 0;
uint32_t tag = track->tag;if (track->mode == MODE_MOV) {if (track->timescale > UINT16_MAX || !track->par->channels) {if (mov_get_lpcm_flags(track->par->codec_id))tag = AV_RL32("lpcm");version = 2;} else if (track->audio_vbr || mov_pcm_le_gt16(track->par->codec_id) ||mov_pcm_be_gt16(track->par->codec_id) ||track->par->codec_id == AV_CODEC_ID_ADPCM_MS ||track->par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV ||track->par->codec_id == AV_CODEC_ID_QDM2) {version = 1;} }avio_wb32(pb, 0); /* size */ if (mov->encryption_scheme != MOV_ENC_NONE) {ffio_wfourcc(pb, "enca"); } else {avio_wl32(pb, tag); // store it byteswapped } avio_wb32(pb, 0); /* Reserved */ avio_wb16(pb, 0); /* Reserved */ avio_wb16(pb, 1); /* Data-reference index, XXX == 1 *//* SoundDescription */ avio_wb16(pb, version); /* Version */ avio_wb16(pb, 0); /* Revision level */ avio_wb32(pb, 0); /* Reserved */if (version == 2) {avio_wb16(pb, 3);avio_wb16(pb, 16);avio_wb16(pb, 0xfffe);avio_wb16(pb, 0);avio_wb32(pb, 0x00010000);avio_wb32(pb, 72);avio_wb64(pb, av_double2int(track->par->sample_rate));avio_wb32(pb, track->par->channels);avio_wb32(pb, 0x7F000000);avio_wb32(pb, av_get_bits_per_sample(track->par->codec_id));avio_wb32(pb, mov_get_lpcm_flags(track->par->codec_id));avio_wb32(pb, track->sample_size);avio_wb32(pb, get_samples_per_packet(track)); } else { #if 1 // zzbif (track->mode == MODE_MOV) {avio_wb16(pb, track->par->channels);if (track->par->codec_id == AV_CODEC_ID_PCM_U8 ||track->par->codec_id == AV_CODEC_ID_PCM_S8)avio_wb16(pb, 8); /* bits per sample */else if (track->par->codec_id == AV_CODEC_ID_ADPCM_G726)avio_wb16(pb, track->par->bits_per_coded_sample);elseavio_wb16(pb, 16);avio_wb16(pb, track->audio_vbr ? -2 : 0); /* compression ID */} else { /* reserved for mp4/3gp */avio_wb16(pb, track->par->channels > 0 ?track->par->channels : 1);track->par->bits_per_coded_sample = av_get_bits_per_sample(track->par->codec_id);avio_wb16(pb, track->par->bits_per_coded_sample > 0 ?track->par->bits_per_coded_sample : 16);avio_wb16(pb, 0);}avio_wb16(pb, 0); /* packet size (= 0) */avio_wb16(pb, track->par->sample_rate <= UINT16_MAX ?track->par->sample_rate : 0);avio_wb16(pb, 0); /* Reserved */#else
if (track->mode == MODE_MOV) {
avio_wb16(pb, track->par->channels);
if (track->par->codec_id == AV_CODEC_ID_PCM_U8 ||
track->par->codec_id == AV_CODEC_ID_PCM_S8)
avio_wb16(pb, 8); /* bits per sample /
else if (track->par->codec_id == AV_CODEC_ID_ADPCM_G726)
avio_wb16(pb, track->par->bits_per_coded_sample);
else
avio_wb16(pb, 16);
avio_wb16(pb, track->audio_vbr ? -2 : 0); / compression ID /
} else { / reserved for mp4/3gp */
if (track->par->codec_id == AV_CODEC_ID_FLAC ||
track->par->codec_id == AV_CODEC_ID_OPUS) {
avio_wb16(pb, track->par->channels);
} else {
avio_wb16(pb, 2);
}
if (track->par->codec_id == AV_CODEC_ID_FLAC) {
avio_wb16(pb, track->par->bits_per_raw_sample);
} else {
avio_wb16(pb, 16);
}
avio_wb16(pb, 0);
}avio_wb16(pb, 0); /* packet size (= 0) */if (track->par->codec_id == AV_CODEC_ID_OPUS)avio_wb16(pb, 48000);elseavio_wb16(pb, track->par->sample_rate <= UINT16_MAX ?track->par->sample_rate : 0);avio_wb16(pb, 0); /* Reserved */#endif
// if (track->mode == MODE_MOV) {// avio_wb16(pb, track->par->channels);// if (track->par->codec_id == AV_CODEC_ID_PCM_U8 ||// track->par->codec_id == AV_CODEC_ID_PCM_S8)// avio_wb16(pb, 8); /* bits per sample */// else if (track->par->codec_id == AV_CODEC_ID_ADPCM_G726)// avio_wb16(pb, track->par->bits_per_coded_sample);// else// avio_wb16(pb, 16);// avio_wb16(pb, track->audio_vbr ? -2 : 0); /* compression ID */// } else { /* reserved for mp4/3gp */// if (track->par->codec_id == AV_CODEC_ID_FLAC ||// track->par->codec_id == AV_CODEC_ID_OPUS) {// avio_wb16(pb, track->par->channels);// } else {// avio_wb16(pb, 2);// }// if (track->par->codec_id == AV_CODEC_ID_FLAC) {// avio_wb16(pb, track->par->bits_per_raw_sample);// } else {// avio_wb16(pb, 16);// }// avio_wb16(pb, 0);// }// avio_wb16(pb, 0); /* packet size (= 0) */// if (track->par->codec_id == AV_CODEC_ID_OPUS)// avio_wb16(pb, 48000);// else// avio_wb16(pb, track->par->sample_rate <= UINT16_MAX ?// track->par->sample_rate : 0);// avio_wb16(pb, 0); /* Reserved */ }if (version == 1) { /* SoundDescription V1 extended info */if (mov_pcm_le_gt16(track->par->codec_id) ||mov_pcm_be_gt16(track->par->codec_id))avio_wb32(pb, 1); /* must be 1 for uncompressed formats */elseavio_wb32(pb, track->par->frame_size); /* Samples per packet */avio_wb32(pb, track->sample_size / track->par->channels); /* Bytes per packet */avio_wb32(pb, track->sample_size); /* Bytes per frame */avio_wb32(pb, 2); /* Bytes per sample */ }if (track->mode == MODE_MOV &&(track->par->codec_id == AV_CODEC_ID_AAC ||track->par->codec_id == AV_CODEC_ID_AC3 ||track->par->codec_id == AV_CODEC_ID_EAC3 ||track->par->codec_id == AV_CODEC_ID_AMR_NB ||track->par->codec_id == AV_CODEC_ID_ALAC ||track->par->codec_id == AV_CODEC_ID_ADPCM_MS ||track->par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV ||track->par->codec_id == AV_CODEC_ID_QDM2 ||(mov_pcm_le_gt16(track->par->codec_id) && version==1) ||(mov_pcm_be_gt16(track->par->codec_id) && version==1)))mov_write_wave_tag(s, pb, track); else if (track->tag == MKTAG('m','p','4','a'))mov_write_esds_tag(pb, track); else if (track->par->codec_id == AV_CODEC_ID_AMR_NB)mov_write_amr_tag(pb, track); else if (track->par->codec_id == AV_CODEC_ID_AC3)mov_write_ac3_tag(pb, track); else if (track->par->codec_id == AV_CODEC_ID_EAC3)mov_write_eac3_tag(pb, track); else if (track->par->codec_id == AV_CODEC_ID_ALAC)mov_write_extradata_tag(pb, track); else if (track->par->codec_id == AV_CODEC_ID_WMAPRO)mov_write_wfex_tag(s, pb, track); else if (track->par->codec_id == AV_CODEC_ID_FLAC)mov_write_dfla_tag(pb, track); else if (track->par->codec_id == AV_CODEC_ID_OPUS)mov_write_dops_tag(pb, track); else if (track->vos_len > 0)mov_write_glbl_tag(pb, track);if (track->mode == MODE_MOV && track->par->codec_type == AVMEDIA_TYPE_AUDIO)mov_write_chan_tag(s, pb, track);if (mov->encryption_scheme != MOV_ENC_NONE) {ff_mov_cenc_write_sinf_tag(track, pb, mov->encryption_kid); }return update_size(pb, pos); }static int mov_find_codec_tag(AVFormatContext *s, MOVTrack *track) {
int tag;#if 1 // zzb if (track->mode == MODE_MP4 || track->mode == MODE_PSP) tag = track->par->codec_tag; else if (track->mode == MODE_ISM) { tag = track->par->codec_tag; } else if (track->mode == MODE_IPOD) {if (!av_match_ext(s->url, "m4a") &&!av_match_ext(s->url, "m4v") &&!av_match_ext(s->url, "m4b"))av_log(s, AV_LOG_WARNING, "Warning, extension is not .m4a nor .m4v ""Quicktime/Ipod might not play the file\n");tag = track->par->codec_tag; } else if (track->mode & MODE_3GP) tag = track->par->codec_tag; else if (track->mode == MODE_F4V)tag = track->par->codec_tag; if (tag == 0){tag = mov_get_codec_tag(s, track); }#else
if (track->mode == MODE_MP4 || track->mode == MODE_PSP)
tag = track->par->codec_tag;
else if (track->mode == MODE_ISM)
tag = track->par->codec_tag;
else if (track->mode == MODE_IPOD) {
if (!av_match_ext(s->url, “m4a”) &&
!av_match_ext(s->url, “m4v”) &&
!av_match_ext(s->url, “m4b”))
av_log(s, AV_LOG_WARNING, "Warning, extension is not .m4a nor .m4v "
“Quicktime/Ipod might not play the file\n”);
tag = track->par->codec_tag;
} else if (track->mode & MODE_3GP)
tag = track->par->codec_tag;
else if (track->mode == MODE_F4V)
tag = track->par->codec_tag;
else
tag = mov_get_codec_tag(s, track);
#endif// if (is_cover_image(track->st)) // return ff_codec_get_tag(codec_cover_image_tags, track->par->codec_id);// if (track->mode == MODE_MP4 || track->mode == MODE_PSP) // tag = track->par->codec_tag; // else if (track->mode == MODE_ISM) // tag = track->par->codec_tag; // else if (track->mode == MODE_IPOD) { // if (!av_match_ext(s->url, "m4a") && // !av_match_ext(s->url, "m4v") && // !av_match_ext(s->url, "m4b")) // av_log(s, AV_LOG_WARNING, "Warning, extension is not .m4a nor .m4v " // "Quicktime/Ipod might not play the file\n"); // tag = track->par->codec_tag; // } else if (track->mode & MODE_3GP) // tag = track->par->codec_tag; // else if (track->mode == MODE_F4V) // tag = track->par->codec_tag; // else // tag = mov_get_codec_tag(s, track);return tag; }
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