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"
27 #include "libavutil/intfloat.h"
28 #include "libavutil/dict.h"
30 #define FRAME_SIZE_OFFSET 40
35 int size_entries_used;
39 static uint32_t codec_flags(enum AVCodecID codec_id) {
41 case AV_CODEC_ID_PCM_F32BE:
42 case AV_CODEC_ID_PCM_F64BE:
43 return 1; //< kCAFLinearPCMFormatFlagIsFloat
44 case AV_CODEC_ID_PCM_S16LE:
45 case AV_CODEC_ID_PCM_S24LE:
46 case AV_CODEC_ID_PCM_S32LE:
47 return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
48 case AV_CODEC_ID_PCM_F32LE:
49 case AV_CODEC_ID_PCM_F64LE:
50 return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
56 static uint32_t samples_per_packet(const AVCodecParameters *par) {
57 enum AVCodecID codec_id = par->codec_id;
58 int channels = par->ch_layout.nb_channels, block_align = par->block_align;
59 int frame_size = par->frame_size, sample_rate = par->sample_rate;
62 case AV_CODEC_ID_PCM_S8:
63 case AV_CODEC_ID_PCM_S16LE:
64 case AV_CODEC_ID_PCM_S16BE:
65 case AV_CODEC_ID_PCM_S24LE:
66 case AV_CODEC_ID_PCM_S24BE:
67 case AV_CODEC_ID_PCM_S32LE:
68 case AV_CODEC_ID_PCM_S32BE:
69 case AV_CODEC_ID_PCM_F32LE:
70 case AV_CODEC_ID_PCM_F32BE:
71 case AV_CODEC_ID_PCM_F64LE:
72 case AV_CODEC_ID_PCM_F64BE:
73 case AV_CODEC_ID_PCM_ALAW:
74 case AV_CODEC_ID_PCM_MULAW:
76 case AV_CODEC_ID_MACE3:
77 case AV_CODEC_ID_MACE6:
79 case AV_CODEC_ID_ADPCM_IMA_QT:
81 case AV_CODEC_ID_AMR_NB:
83 case AV_CODEC_ID_ILBC:
84 case AV_CODEC_ID_QCELP:
86 case AV_CODEC_ID_GSM_MS:
90 case AV_CODEC_ID_OPUS:
91 return frame_size * 48000 / sample_rate;
97 case AV_CODEC_ID_QDM2:
98 case AV_CODEC_ID_QDMC:
99 return 2048 * channels;
100 case AV_CODEC_ID_ALAC:
102 case AV_CODEC_ID_ADPCM_IMA_WAV:
103 return (block_align - 4 * channels) * 8 / (4 * channels) + 1;
104 case AV_CODEC_ID_ADPCM_MS:
105 return (block_align - 7 * channels) * 2 / channels + 2;
111 static int caf_write_header(AVFormatContext *s)
113 AVIOContext *pb = s->pb;
114 AVCodecParameters *par = s->streams[0]->codecpar;
115 CAFContext *caf = s->priv_data;
116 const AVDictionaryEntry *t = NULL;
117 unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, par->codec_id);
118 int64_t chunk_size = 0;
119 int frame_size = par->frame_size, sample_rate = par->sample_rate;
121 if (s->nb_streams != 1) {
122 av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
123 return AVERROR(EINVAL);
126 switch (par->codec_id) {
127 case AV_CODEC_ID_AAC:
128 av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
129 return AVERROR_PATCHWELCOME;
132 if (par->codec_id == AV_CODEC_ID_OPUS && par->ch_layout.nb_channels > 2) {
133 av_log(s, AV_LOG_ERROR, "Only mono and stereo are supported for Opus\n");
134 return AVERROR_INVALIDDATA;
138 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
139 return AVERROR_INVALIDDATA;
142 if (!par->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
143 av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
144 return AVERROR_INVALIDDATA;
147 if (par->codec_id != AV_CODEC_ID_MP3 || frame_size != 576)
148 frame_size = samples_per_packet(par);
150 if (par->codec_id == AV_CODEC_ID_OPUS)
153 ffio_wfourcc(pb, "caff"); //< mFileType
154 avio_wb16(pb, 1); //< mFileVersion
155 avio_wb16(pb, 0); //< mFileFlags
157 ffio_wfourcc(pb, "desc"); //< Audio Description chunk
158 avio_wb64(pb, 32); //< mChunkSize
159 avio_wb64(pb, av_double2int(sample_rate)); //< mSampleRate
160 avio_wl32(pb, codec_tag); //< mFormatID
161 avio_wb32(pb, codec_flags(par->codec_id)); //< mFormatFlags
162 avio_wb32(pb, par->block_align); //< mBytesPerPacket
163 avio_wb32(pb, frame_size); //< mFramesPerPacket
164 avio_wb32(pb, par->ch_layout.nb_channels); //< mChannelsPerFrame
165 avio_wb32(pb, av_get_bits_per_sample(par->codec_id)); //< mBitsPerChannel
167 if (par->ch_layout.order == AV_CHANNEL_ORDER_NATIVE) {
168 ffio_wfourcc(pb, "chan");
170 ff_mov_write_chan(pb, par->ch_layout.u.mask);
173 if (par->codec_id == AV_CODEC_ID_ALAC) {
174 ffio_wfourcc(pb, "kuki");
175 avio_wb64(pb, 12 + par->extradata_size);
176 avio_write(pb, "\0\0\0\14frmaalac", 12);
177 avio_write(pb, par->extradata, par->extradata_size);
178 } else if (par->codec_id == AV_CODEC_ID_AMR_NB) {
179 ffio_wfourcc(pb, "kuki");
181 avio_write(pb, "\0\0\0\14frmasamr", 12);
182 avio_wb32(pb, 0x11); /* size */
183 avio_write(pb, "samrFFMP", 8);
184 avio_w8(pb, 0); /* decoder version */
186 avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
187 avio_w8(pb, 0x00); /* Mode change period (no restriction) */
188 avio_w8(pb, 0x01); /* Frames per sample */
189 } else if (par->codec_id == AV_CODEC_ID_QDM2 || par->codec_id == AV_CODEC_ID_QDMC) {
190 ffio_wfourcc(pb, "kuki");
191 avio_wb64(pb, par->extradata_size);
192 avio_write(pb, par->extradata, par->extradata_size);
195 ff_standardize_creation_time(s);
196 if (av_dict_count(s->metadata)) {
197 ffio_wfourcc(pb, "info"); //< Information chunk
198 while ((t = av_dict_iterate(s->metadata, t))) {
199 chunk_size += strlen(t->key) + strlen(t->value) + 2;
201 avio_wb64(pb, chunk_size + 4);
202 avio_wb32(pb, av_dict_count(s->metadata));
204 while ((t = av_dict_iterate(s->metadata, t))) {
205 avio_put_str(pb, t->key);
206 avio_put_str(pb, t->value);
210 ffio_wfourcc(pb, "data"); //< Audio Data chunk
211 caf->data = avio_tell(pb);
212 avio_wb64(pb, -1); //< mChunkSize
213 avio_wb32(pb, 0); //< mEditCount
218 static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
220 CAFContext *caf = s->priv_data;
221 AVStream *const st = s->streams[0];
223 if (!st->codecpar->block_align) {
225 int i, alloc_size = caf->size_entries_used + 5U;
227 return AVERROR(ERANGE);
229 pkt_sizes = av_fast_realloc(st->priv_data,
230 &caf->size_buffer_size,
233 return AVERROR(ENOMEM);
234 st->priv_data = pkt_sizes;
235 for (i = 4; i > 0; i--) {
236 unsigned top = pkt->size >> i * 7;
238 pkt_sizes[caf->size_entries_used++] = 128 | top;
240 pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
243 avio_write(s->pb, pkt->data, pkt->size);
247 static int caf_write_trailer(AVFormatContext *s)
249 CAFContext *caf = s->priv_data;
250 AVIOContext *pb = s->pb;
251 AVStream *st = s->streams[0];
252 AVCodecParameters *par = st->codecpar;
254 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
255 int64_t file_size = avio_tell(pb);
257 avio_seek(pb, caf->data, SEEK_SET);
258 avio_wb64(pb, file_size - caf->data - 8);
259 if (!par->block_align) {
260 int packet_size = samples_per_packet(par);
262 packet_size = st->duration / (caf->packets - 1);
263 avio_seek(pb, FRAME_SIZE_OFFSET, SEEK_SET);
264 avio_wb32(pb, packet_size);
266 avio_seek(pb, file_size, SEEK_SET);
267 ffio_wfourcc(pb, "pakt");
268 avio_wb64(pb, caf->size_entries_used + 24U);
269 avio_wb64(pb, caf->packets); ///< mNumberPackets
270 avio_wb64(pb, caf->packets * packet_size); ///< mNumberValidFrames
271 avio_wb32(pb, 0); ///< mPrimingFrames
272 avio_wb32(pb, 0); ///< mRemainderFrames
273 avio_write(pb, st->priv_data, caf->size_entries_used);
279 const FFOutputFormat ff_caf_muxer = {
281 .p.long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
282 .p.mime_type = "audio/x-caf",
283 .p.extensions = "caf",
284 .priv_data_size = sizeof(CAFContext),
285 .p.audio_codec = AV_CODEC_ID_PCM_S16BE,
286 .p.video_codec = AV_CODEC_ID_NONE,
287 .write_header = caf_write_header,
288 .write_packet = caf_write_packet,
289 .write_trailer = caf_write_trailer,
290 .p.codec_tag = ff_caf_codec_tags_list,