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) {
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_ALAC:
90 case AV_CODEC_ID_QDM2:
92 case AV_CODEC_ID_ADPCM_IMA_WAV:
93 return (1024 - 4 * channels) * 8 / (4 * channels) + 1;
94 case AV_CODEC_ID_ADPCM_MS:
95 return (1024 - 7 * channels) * 2 / channels + 2;
101 static int caf_write_header(AVFormatContext *s)
103 AVIOContext *pb = s->pb;
104 AVCodecContext *enc = s->streams[0]->codec;
105 CAFContext *caf = s->priv_data;
106 AVDictionaryEntry *t = NULL;
107 unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
108 int64_t chunk_size = 0;
110 switch (enc->codec_id) {
111 case AV_CODEC_ID_AAC:
112 case AV_CODEC_ID_AC3:
113 av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
114 return AVERROR_PATCHWELCOME;
117 switch (enc->codec_id) {
118 case AV_CODEC_ID_PCM_S8:
119 case AV_CODEC_ID_PCM_S16LE:
120 case AV_CODEC_ID_PCM_S16BE:
121 case AV_CODEC_ID_PCM_S24LE:
122 case AV_CODEC_ID_PCM_S24BE:
123 case AV_CODEC_ID_PCM_S32LE:
124 case AV_CODEC_ID_PCM_S32BE:
125 case AV_CODEC_ID_PCM_F32LE:
126 case AV_CODEC_ID_PCM_F32BE:
127 case AV_CODEC_ID_PCM_F64LE:
128 case AV_CODEC_ID_PCM_F64BE:
129 case AV_CODEC_ID_PCM_ALAW:
130 case AV_CODEC_ID_PCM_MULAW:
131 codec_tag = MKTAG('l','p','c','m');
135 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
136 return AVERROR_INVALIDDATA;
139 if (!enc->block_align && !pb->seekable) {
140 av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
141 return AVERROR_INVALIDDATA;
144 ffio_wfourcc(pb, "caff"); //< mFileType
145 avio_wb16(pb, 1); //< mFileVersion
146 avio_wb16(pb, 0); //< mFileFlags
148 ffio_wfourcc(pb, "desc"); //< Audio Description chunk
149 avio_wb64(pb, 32); //< mChunkSize
150 avio_wb64(pb, av_double2int(enc->sample_rate)); //< mSampleRate
151 avio_wl32(pb, codec_tag); //< mFormatID
152 avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags
153 avio_wb32(pb, enc->block_align); //< mBytesPerPacket
154 avio_wb32(pb, samples_per_packet(enc->codec_id, enc->channels)); //< mFramesPerPacket
155 avio_wb32(pb, enc->channels); //< mChannelsPerFrame
156 avio_wb32(pb, av_get_bits_per_sample(enc->codec_id)); //< mBitsPerChannel
158 if (enc->channel_layout) {
159 ffio_wfourcc(pb, "chan");
161 ff_mov_write_chan(pb, enc->channel_layout);
164 if (enc->codec_id == AV_CODEC_ID_ALAC) {
165 ffio_wfourcc(pb, "kuki");
166 avio_wb64(pb, 12 + enc->extradata_size);
167 avio_write(pb, "\0\0\0\14frmaalac", 12);
168 avio_write(pb, enc->extradata, enc->extradata_size);
169 } else if (enc->codec_id == AV_CODEC_ID_AMR_NB) {
170 ffio_wfourcc(pb, "kuki");
172 avio_write(pb, "\0\0\0\14frmasamr", 12);
173 avio_wb32(pb, 0x11); /* size */
174 avio_write(pb, "samrFFMP", 8);
175 avio_w8(pb, 0); /* decoder version */
177 avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
178 avio_w8(pb, 0x00); /* Mode change period (no restriction) */
179 avio_w8(pb, 0x01); /* Frames per sample */
180 } else if (enc->codec_id == AV_CODEC_ID_QDM2) {
181 ffio_wfourcc(pb, "kuki");
182 avio_wb64(pb, enc->extradata_size);
183 avio_write(pb, enc->extradata, enc->extradata_size);
186 if (av_dict_count(s->metadata)) {
187 ffio_wfourcc(pb, "info"); //< Information chunk
188 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
189 chunk_size += strlen(t->key) + strlen(t->value) + 2;
191 avio_wb64(pb, chunk_size + 4);
192 avio_wb32(pb, av_dict_count(s->metadata));
194 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
195 avio_put_str(pb, t->key);
196 avio_put_str(pb, t->value);
200 ffio_wfourcc(pb, "data"); //< Audio Data chunk
201 caf->data = avio_tell(pb);
202 avio_wb64(pb, -1); //< mChunkSize
203 avio_wb32(pb, 0); //< mEditCount
209 static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
211 CAFContext *caf = s->priv_data;
213 avio_write(s->pb, pkt->data, pkt->size);
214 if (!s->streams[0]->codec->block_align) {
215 void *pkt_sizes = caf->pkt_sizes;
216 int i, alloc_size = caf->size_entries_used + 5;
217 if (alloc_size < 0) {
218 caf->pkt_sizes = NULL;
220 caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes,
221 &caf->size_buffer_size,
224 if (!caf->pkt_sizes) {
226 return AVERROR(ENOMEM);
228 for (i = 4; i > 0; i--) {
229 unsigned top = pkt->size >> i * 7;
231 caf->pkt_sizes[caf->size_entries_used++] = 128 | top;
233 caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
239 static int caf_write_trailer(AVFormatContext *s)
241 AVIOContext *pb = s->pb;
242 AVCodecContext *enc = s->streams[0]->codec;
245 CAFContext *caf = s->priv_data;
246 int64_t file_size = avio_tell(pb);
248 avio_seek(pb, caf->data, SEEK_SET);
249 avio_wb64(pb, file_size - caf->data - 8);
250 avio_seek(pb, file_size, SEEK_SET);
251 if (!enc->block_align) {
252 ffio_wfourcc(pb, "pakt");
253 avio_wb64(pb, caf->size_entries_used + 24);
254 avio_wb64(pb, caf->packets); ///< mNumberPackets
255 avio_wb64(pb, caf->packets * samples_per_packet(enc->codec_id, enc->channels)); ///< mNumberValidFrames
256 avio_wb32(pb, 0); ///< mPrimingFrames
257 avio_wb32(pb, 0); ///< mRemainderFrames
258 avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
259 av_freep(&caf->pkt_sizes);
260 caf->size_buffer_size = 0;
267 AVOutputFormat ff_caf_muxer = {
269 .long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
270 .mime_type = "audio/x-caf",
272 .priv_data_size = sizeof(CAFContext),
273 .audio_codec = AV_CODEC_ID_PCM_S16BE,
274 .video_codec = AV_CODEC_ID_NONE,
275 .write_header = caf_write_header,
276 .write_packet = caf_write_packet,
277 .write_trailer = caf_write_trailer,
278 .codec_tag = (const AVCodecTag* const []){ff_codec_caf_tags, 0},