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
25 #include "avio_internal.h"
26 #include "libavutil/intfloat.h"
27 #include "libavutil/dict.h"
33 int size_entries_used;
37 static uint32_t codec_flags(enum AVCodecID codec_id) {
39 case AV_CODEC_ID_PCM_F32BE:
40 case AV_CODEC_ID_PCM_F64BE:
41 return 1; //< kCAFLinearPCMFormatFlagIsFloat
42 case AV_CODEC_ID_PCM_S16LE:
43 case AV_CODEC_ID_PCM_S24LE:
44 case AV_CODEC_ID_PCM_S32LE:
45 return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
46 case AV_CODEC_ID_PCM_F32LE:
47 case AV_CODEC_ID_PCM_F64LE:
48 return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
54 static uint32_t samples_per_packet(enum AVCodecID codec_id, int channels, int block_align) {
56 case AV_CODEC_ID_PCM_S8:
57 case AV_CODEC_ID_PCM_S16LE:
58 case AV_CODEC_ID_PCM_S16BE:
59 case AV_CODEC_ID_PCM_S24LE:
60 case AV_CODEC_ID_PCM_S24BE:
61 case AV_CODEC_ID_PCM_S32LE:
62 case AV_CODEC_ID_PCM_S32BE:
63 case AV_CODEC_ID_PCM_F32LE:
64 case AV_CODEC_ID_PCM_F32BE:
65 case AV_CODEC_ID_PCM_F64LE:
66 case AV_CODEC_ID_PCM_F64BE:
67 case AV_CODEC_ID_PCM_ALAW:
68 case AV_CODEC_ID_PCM_MULAW:
70 case AV_CODEC_ID_MACE3:
71 case AV_CODEC_ID_MACE6:
73 case AV_CODEC_ID_ADPCM_IMA_QT:
75 case AV_CODEC_ID_AMR_NB:
77 case AV_CODEC_ID_ILBC:
78 case AV_CODEC_ID_QCELP:
80 case AV_CODEC_ID_GSM_MS:
89 case AV_CODEC_ID_QDM2:
90 return 2048 * channels;
91 case AV_CODEC_ID_ALAC:
93 case AV_CODEC_ID_ADPCM_IMA_WAV:
94 return (block_align - 4 * channels) * 8 / (4 * channels) + 1;
95 case AV_CODEC_ID_ADPCM_MS:
96 return (block_align - 7 * channels) * 2 / channels + 2;
102 static int caf_write_header(AVFormatContext *s)
104 AVIOContext *pb = s->pb;
105 AVCodecParameters *par = s->streams[0]->codecpar;
106 CAFContext *caf = s->priv_data;
107 AVDictionaryEntry *t = NULL;
108 unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, par->codec_id);
109 int64_t chunk_size = 0;
110 int frame_size = par->frame_size;
112 if (s->nb_streams != 1) {
113 av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
114 return AVERROR(EINVAL);
117 switch (par->codec_id) {
118 case AV_CODEC_ID_AAC:
119 av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
120 return AVERROR_PATCHWELCOME;
124 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
125 return AVERROR_INVALIDDATA;
128 if (!par->block_align && !pb->seekable) {
129 av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
130 return AVERROR_INVALIDDATA;
133 if (par->codec_id != AV_CODEC_ID_MP3 || frame_size != 576)
134 frame_size = samples_per_packet(par->codec_id, par->channels, par->block_align);
136 ffio_wfourcc(pb, "caff"); //< mFileType
137 avio_wb16(pb, 1); //< mFileVersion
138 avio_wb16(pb, 0); //< mFileFlags
140 ffio_wfourcc(pb, "desc"); //< Audio Description chunk
141 avio_wb64(pb, 32); //< mChunkSize
142 avio_wb64(pb, av_double2int(par->sample_rate)); //< mSampleRate
143 avio_wl32(pb, codec_tag); //< mFormatID
144 avio_wb32(pb, codec_flags(par->codec_id)); //< mFormatFlags
145 avio_wb32(pb, par->block_align); //< mBytesPerPacket
146 avio_wb32(pb, frame_size); //< mFramesPerPacket
147 avio_wb32(pb, par->channels); //< mChannelsPerFrame
148 avio_wb32(pb, av_get_bits_per_sample(par->codec_id)); //< mBitsPerChannel
150 if (par->channel_layout) {
151 ffio_wfourcc(pb, "chan");
153 ff_mov_write_chan(pb, par->channel_layout);
156 if (par->codec_id == AV_CODEC_ID_ALAC) {
157 ffio_wfourcc(pb, "kuki");
158 avio_wb64(pb, 12 + par->extradata_size);
159 avio_write(pb, "\0\0\0\14frmaalac", 12);
160 avio_write(pb, par->extradata, par->extradata_size);
161 } else if (par->codec_id == AV_CODEC_ID_AMR_NB) {
162 ffio_wfourcc(pb, "kuki");
164 avio_write(pb, "\0\0\0\14frmasamr", 12);
165 avio_wb32(pb, 0x11); /* size */
166 avio_write(pb, "samrFFMP", 8);
167 avio_w8(pb, 0); /* decoder version */
169 avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
170 avio_w8(pb, 0x00); /* Mode change period (no restriction) */
171 avio_w8(pb, 0x01); /* Frames per sample */
172 } else if (par->codec_id == AV_CODEC_ID_QDM2) {
173 ffio_wfourcc(pb, "kuki");
174 avio_wb64(pb, par->extradata_size);
175 avio_write(pb, par->extradata, par->extradata_size);
178 ff_standardize_creation_time(s);
179 if (av_dict_count(s->metadata)) {
180 ffio_wfourcc(pb, "info"); //< Information chunk
181 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
182 chunk_size += strlen(t->key) + strlen(t->value) + 2;
184 avio_wb64(pb, chunk_size + 4);
185 avio_wb32(pb, av_dict_count(s->metadata));
187 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
188 avio_put_str(pb, t->key);
189 avio_put_str(pb, t->value);
193 ffio_wfourcc(pb, "data"); //< Audio Data chunk
194 caf->data = avio_tell(pb);
195 avio_wb64(pb, -1); //< mChunkSize
196 avio_wb32(pb, 0); //< mEditCount
202 static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
204 CAFContext *caf = s->priv_data;
206 avio_write(s->pb, pkt->data, pkt->size);
207 if (!s->streams[0]->codecpar->block_align) {
208 void *pkt_sizes = caf->pkt_sizes;
209 int i, alloc_size = caf->size_entries_used + 5;
210 if (alloc_size < 0) {
211 caf->pkt_sizes = NULL;
213 caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes,
214 &caf->size_buffer_size,
217 if (!caf->pkt_sizes) {
219 return AVERROR(ENOMEM);
221 for (i = 4; i > 0; i--) {
222 unsigned top = pkt->size >> i * 7;
224 caf->pkt_sizes[caf->size_entries_used++] = 128 | top;
226 caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
232 static int caf_write_trailer(AVFormatContext *s)
234 CAFContext *caf = s->priv_data;
235 AVIOContext *pb = s->pb;
236 AVCodecParameters *par = s->streams[0]->codecpar;
239 int64_t file_size = avio_tell(pb);
241 avio_seek(pb, caf->data, SEEK_SET);
242 avio_wb64(pb, file_size - caf->data - 8);
243 avio_seek(pb, file_size, SEEK_SET);
244 if (!par->block_align) {
245 ffio_wfourcc(pb, "pakt");
246 avio_wb64(pb, caf->size_entries_used + 24);
247 avio_wb64(pb, caf->packets); ///< mNumberPackets
248 avio_wb64(pb, caf->packets * samples_per_packet(par->codec_id, par->channels, par->block_align)); ///< mNumberValidFrames
249 avio_wb32(pb, 0); ///< mPrimingFrames
250 avio_wb32(pb, 0); ///< mRemainderFrames
251 avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
252 caf->size_buffer_size = 0;
256 av_freep(&caf->pkt_sizes);
260 AVOutputFormat ff_caf_muxer = {
262 .long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
263 .mime_type = "audio/x-caf",
265 .priv_data_size = sizeof(CAFContext),
266 .audio_codec = AV_CODEC_ID_PCM_S16BE,
267 .video_codec = AV_CODEC_ID_NONE,
268 .write_header = caf_write_header,
269 .write_packet = caf_write_packet,
270 .write_trailer = caf_write_trailer,
271 .codec_tag = (const AVCodecTag* const []){ff_codec_caf_tags, 0},