2 * Core Audio Format muxer
3 * Copyright (c) 2011 Carl Eugen Hoyos
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "avio_internal.h"
32 static uint32_t codec_flags(enum CodecID codec_id) {
34 case CODEC_ID_PCM_F32BE:
35 case CODEC_ID_PCM_F64BE:
36 return 1; //< kCAFLinearPCMFormatFlagIsFloat
37 case CODEC_ID_PCM_S16LE:
38 case CODEC_ID_PCM_S24LE:
39 case CODEC_ID_PCM_S32LE:
40 return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
41 case CODEC_ID_PCM_F32LE:
42 case CODEC_ID_PCM_F64LE:
43 return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
49 static uint32_t samples_per_packet(enum CodecID codec_id) {
52 case CODEC_ID_PCM_S16LE:
53 case CODEC_ID_PCM_S16BE:
54 case CODEC_ID_PCM_S24LE:
55 case CODEC_ID_PCM_S24BE:
56 case CODEC_ID_PCM_S32LE:
57 case CODEC_ID_PCM_S32BE:
58 case CODEC_ID_PCM_F32LE:
59 case CODEC_ID_PCM_F32BE:
60 case CODEC_ID_PCM_F64LE:
61 case CODEC_ID_PCM_F64BE:
62 case CODEC_ID_PCM_ALAW:
63 case CODEC_ID_PCM_MULAW:
68 case CODEC_ID_ADPCM_IMA_QT:
89 static int caf_write_header(AVFormatContext *s)
91 AVIOContext *pb = s->pb;
92 AVCodecContext *enc = s->streams[0]->codec;
93 CAFContext *caf = s->priv_data;
94 unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
96 switch (enc->codec_id) {
98 case CODEC_ID_PCM_S16LE:
99 case CODEC_ID_PCM_S16BE:
100 case CODEC_ID_PCM_S24LE:
101 case CODEC_ID_PCM_S24BE:
102 case CODEC_ID_PCM_S32LE:
103 case CODEC_ID_PCM_S32BE:
104 case CODEC_ID_PCM_F32LE:
105 case CODEC_ID_PCM_F32BE:
106 case CODEC_ID_PCM_F64LE:
107 case CODEC_ID_PCM_F64BE:
108 case CODEC_ID_PCM_ALAW:
109 case CODEC_ID_PCM_MULAW:
110 codec_tag = MKBETAG('l','p','c','m');
114 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
115 return AVERROR_INVALIDDATA;
118 if (!enc->block_align) {
119 av_log(s, AV_LOG_ERROR, "muxing with unknown or variable packet size not yet supported\n");
120 return AVERROR_PATCHWELCOME;
123 ffio_wfourcc(pb, "caff"); //< mFileType
124 avio_wb16(pb, 1); //< mFileVersion
125 avio_wb16(pb, 0); //< mFileFlags
127 ffio_wfourcc(pb, "desc"); //< Audio Description chunk
128 avio_wb64(pb, 32); //< mChunkSize
129 avio_wb64(pb, av_dbl2int(enc->sample_rate)); //< mSampleRate
130 avio_wb32(pb, codec_tag); //< mFormatID
131 avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags
132 avio_wb32(pb, enc->block_align); //< mBytesPerPacket
133 avio_wb32(pb, samples_per_packet(enc->codec_id)); //< mFramesPerPacket
134 avio_wb32(pb, enc->channels); //< mChannelsPerFrame
135 avio_wb32(pb, enc->bits_per_coded_sample); //< mBitsPerChannel
137 ff_mov_write_chan(s, enc->channel_layout, "chan");
139 ffio_wfourcc(pb, "data"); //< Audio Data chunk
140 caf->data = avio_tell(pb);
141 avio_wb64(pb, -1); //< mChunkSize
142 avio_wb32(pb, 0); //< mEditCount
148 static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
150 avio_write(s->pb, pkt->data, pkt->size);
154 static int caf_write_trailer(AVFormatContext *s)
156 AVIOContext *pb = s->pb;
159 CAFContext *caf = s->priv_data;
160 int64_t file_size = avio_tell(pb);
162 avio_seek(pb, caf->data, SEEK_SET);
163 avio_wb64(pb, file_size - caf->data - 8);
164 avio_seek(pb, file_size, SEEK_SET);
170 AVOutputFormat ff_caf_muxer = {
172 NULL_IF_CONFIG_SMALL("Apple Core Audio Format"),
181 .codec_tag= (const AVCodecTag* const []){ff_codec_caf_tags, 0},