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"
27 #include "libavutil/intfloat_readwrite.h"
33 static uint32_t codec_flags(enum CodecID codec_id) {
35 case CODEC_ID_PCM_F32BE:
36 case CODEC_ID_PCM_F64BE:
37 return 1; //< kCAFLinearPCMFormatFlagIsFloat
38 case CODEC_ID_PCM_S16LE:
39 case CODEC_ID_PCM_S24LE:
40 case CODEC_ID_PCM_S32LE:
41 return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
42 case CODEC_ID_PCM_F32LE:
43 case CODEC_ID_PCM_F64LE:
44 return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
50 static uint32_t samples_per_packet(enum CodecID codec_id, int channels) {
53 case CODEC_ID_PCM_S16LE:
54 case CODEC_ID_PCM_S16BE:
55 case CODEC_ID_PCM_S24LE:
56 case CODEC_ID_PCM_S24BE:
57 case CODEC_ID_PCM_S32LE:
58 case CODEC_ID_PCM_S32BE:
59 case CODEC_ID_PCM_F32LE:
60 case CODEC_ID_PCM_F32BE:
61 case CODEC_ID_PCM_F64LE:
62 case CODEC_ID_PCM_F64BE:
63 case CODEC_ID_PCM_ALAW:
64 case CODEC_ID_PCM_MULAW:
69 case CODEC_ID_ADPCM_IMA_QT:
87 case CODEC_ID_ADPCM_IMA_WAV:
88 return (1024 - 4 * channels) * 8 / (4 * channels) + 1;
89 case CODEC_ID_ADPCM_MS:
90 return (1024 - 7 * channels) * 2 / channels + 2;
96 static int caf_write_header(AVFormatContext *s)
98 AVIOContext *pb = s->pb;
99 AVCodecContext *enc = s->streams[0]->codec;
100 CAFContext *caf = s->priv_data;
101 unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
103 switch (enc->codec_id) {
104 case CODEC_ID_PCM_S8:
105 case CODEC_ID_PCM_S16LE:
106 case CODEC_ID_PCM_S16BE:
107 case CODEC_ID_PCM_S24LE:
108 case CODEC_ID_PCM_S24BE:
109 case CODEC_ID_PCM_S32LE:
110 case CODEC_ID_PCM_S32BE:
111 case CODEC_ID_PCM_F32LE:
112 case CODEC_ID_PCM_F32BE:
113 case CODEC_ID_PCM_F64LE:
114 case CODEC_ID_PCM_F64BE:
115 case CODEC_ID_PCM_ALAW:
116 case CODEC_ID_PCM_MULAW:
117 codec_tag = MKTAG('l','p','c','m');
121 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
122 return AVERROR_INVALIDDATA;
125 if (!enc->block_align) {
126 av_log(s, AV_LOG_ERROR, "muxing with unknown or variable packet size not yet supported\n");
127 return AVERROR_PATCHWELCOME;
130 ffio_wfourcc(pb, "caff"); //< mFileType
131 avio_wb16(pb, 1); //< mFileVersion
132 avio_wb16(pb, 0); //< mFileFlags
134 ffio_wfourcc(pb, "desc"); //< Audio Description chunk
135 avio_wb64(pb, 32); //< mChunkSize
136 avio_wb64(pb, av_dbl2int(enc->sample_rate)); //< mSampleRate
137 avio_wl32(pb, codec_tag); //< mFormatID
138 avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags
139 avio_wb32(pb, enc->block_align); //< mBytesPerPacket
140 avio_wb32(pb, samples_per_packet(enc->codec_id, enc->channels)); //< mFramesPerPacket
141 avio_wb32(pb, enc->channels); //< mChannelsPerFrame
142 avio_wb32(pb, enc->bits_per_coded_sample); //< mBitsPerChannel
144 if (enc->channel_layout) {
145 ffio_wfourcc(pb, "chan");
147 ff_mov_write_chan(pb, enc->channel_layout);
150 ffio_wfourcc(pb, "data"); //< Audio Data chunk
151 caf->data = avio_tell(pb);
152 avio_wb64(pb, -1); //< mChunkSize
153 avio_wb32(pb, 0); //< mEditCount
159 static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
161 avio_write(s->pb, pkt->data, pkt->size);
165 static int caf_write_trailer(AVFormatContext *s)
167 AVIOContext *pb = s->pb;
170 CAFContext *caf = s->priv_data;
171 int64_t file_size = avio_tell(pb);
173 avio_seek(pb, caf->data, SEEK_SET);
174 avio_wb64(pb, file_size - caf->data - 8);
175 avio_seek(pb, file_size, SEEK_SET);
181 AVOutputFormat ff_caf_muxer = {
183 NULL_IF_CONFIG_SMALL("Apple Core Audio Format"),
192 .codec_tag= (const AVCodecTag* const []){ff_codec_caf_tags, 0},