| /* |
| * Core Audio Format muxer |
| * Copyright (c) 2011 Carl Eugen Hoyos |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avformat.h" |
| #include "caf.h" |
| #include "riff.h" |
| #include "isom.h" |
| #include "avio_internal.h" |
| |
| typedef struct { |
| int64_t data; |
| } CAFContext; |
| |
| static uint32_t codec_flags(enum CodecID codec_id) { |
| switch (codec_id) { |
| case CODEC_ID_PCM_F32BE: |
| case CODEC_ID_PCM_F64BE: |
| return 1; //< kCAFLinearPCMFormatFlagIsFloat |
| case CODEC_ID_PCM_S16LE: |
| case CODEC_ID_PCM_S24LE: |
| case CODEC_ID_PCM_S32LE: |
| return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian |
| case CODEC_ID_PCM_F32LE: |
| case CODEC_ID_PCM_F64LE: |
| return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian |
| default: |
| return 0; |
| } |
| } |
| |
| static uint32_t samples_per_packet(enum CodecID codec_id) { |
| switch (codec_id) { |
| case CODEC_ID_PCM_S8: |
| case CODEC_ID_PCM_S16LE: |
| case CODEC_ID_PCM_S16BE: |
| case CODEC_ID_PCM_S24LE: |
| case CODEC_ID_PCM_S24BE: |
| case CODEC_ID_PCM_S32LE: |
| case CODEC_ID_PCM_S32BE: |
| case CODEC_ID_PCM_F32LE: |
| case CODEC_ID_PCM_F32BE: |
| case CODEC_ID_PCM_F64LE: |
| case CODEC_ID_PCM_F64BE: |
| case CODEC_ID_PCM_ALAW: |
| case CODEC_ID_PCM_MULAW: |
| return 1; |
| case CODEC_ID_MACE3: |
| case CODEC_ID_MACE6: |
| return 6; |
| case CODEC_ID_ADPCM_IMA_QT: |
| return 64; |
| case CODEC_ID_AMR_NB: |
| case CODEC_ID_GSM: |
| case CODEC_ID_QCELP: |
| return 160; |
| case CODEC_ID_MP1: |
| return 384; |
| case CODEC_ID_MP2: |
| case CODEC_ID_MP3: |
| return 1152; |
| case CODEC_ID_AC3: |
| return 1536; |
| case CODEC_ID_ALAC: |
| case CODEC_ID_QDM2: |
| return 4096; |
| default: |
| return 0; |
| } |
| } |
| |
| static int caf_write_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVCodecContext *enc = s->streams[0]->codec; |
| CAFContext *caf = s->priv_data; |
| unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id); |
| |
| switch (enc->codec_id) { |
| case CODEC_ID_PCM_S8: |
| case CODEC_ID_PCM_S16LE: |
| case CODEC_ID_PCM_S16BE: |
| case CODEC_ID_PCM_S24LE: |
| case CODEC_ID_PCM_S24BE: |
| case CODEC_ID_PCM_S32LE: |
| case CODEC_ID_PCM_S32BE: |
| case CODEC_ID_PCM_F32LE: |
| case CODEC_ID_PCM_F32BE: |
| case CODEC_ID_PCM_F64LE: |
| case CODEC_ID_PCM_F64BE: |
| case CODEC_ID_PCM_ALAW: |
| case CODEC_ID_PCM_MULAW: |
| codec_tag = MKBETAG('l','p','c','m'); |
| } |
| |
| if (!codec_tag) { |
| av_log(s, AV_LOG_ERROR, "unsupported codec\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (!enc->block_align) { |
| av_log(s, AV_LOG_ERROR, "muxing with unknown or variable packet size not yet supported\n"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| ffio_wfourcc(pb, "caff"); //< mFileType |
| avio_wb16(pb, 1); //< mFileVersion |
| avio_wb16(pb, 0); //< mFileFlags |
| |
| ffio_wfourcc(pb, "desc"); //< Audio Description chunk |
| avio_wb64(pb, 32); //< mChunkSize |
| avio_wb64(pb, av_dbl2int(enc->sample_rate)); //< mSampleRate |
| avio_wb32(pb, codec_tag); //< mFormatID |
| avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags |
| avio_wb32(pb, enc->block_align); //< mBytesPerPacket |
| avio_wb32(pb, samples_per_packet(enc->codec_id)); //< mFramesPerPacket |
| avio_wb32(pb, enc->channels); //< mChannelsPerFrame |
| avio_wb32(pb, enc->bits_per_coded_sample); //< mBitsPerChannel |
| |
| if (enc->channel_layout) { |
| ffio_wfourcc(pb, "chan"); |
| avio_wb64(pb, 12); |
| ff_mov_write_chan(pb, enc->channel_layout); |
| } |
| |
| ffio_wfourcc(pb, "data"); //< Audio Data chunk |
| caf->data = avio_tell(pb); |
| avio_wb64(pb, -1); //< mChunkSize |
| avio_wb32(pb, 0); //< mEditCount |
| |
| avio_flush(pb); |
| return 0; |
| } |
| |
| static int caf_write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| avio_write(s->pb, pkt->data, pkt->size); |
| return 0; |
| } |
| |
| static int caf_write_trailer(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| |
| if (pb->seekable) { |
| CAFContext *caf = s->priv_data; |
| int64_t file_size = avio_tell(pb); |
| |
| avio_seek(pb, caf->data, SEEK_SET); |
| avio_wb64(pb, file_size - caf->data - 8); |
| avio_seek(pb, file_size, SEEK_SET); |
| avio_flush(pb); |
| } |
| return 0; |
| } |
| |
| AVOutputFormat ff_caf_muxer = { |
| "caf", |
| NULL_IF_CONFIG_SMALL("Apple Core Audio Format"), |
| "audio/x-caf", |
| "caf", |
| sizeof(CAFContext), |
| CODEC_ID_PCM_S16BE, |
| CODEC_ID_NONE, |
| caf_write_header, |
| caf_write_packet, |
| caf_write_trailer, |
| .codec_tag= (const AVCodecTag* const []){ff_codec_caf_tags, 0}, |
| }; |