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_QDM2:
90 return 2048 * channels;
91 case AV_CODEC_ID_ALAC:
93 case AV_CODEC_ID_ADPCM_IMA_WAV:
94 return (1024 - 4 * channels) * 8 / (4 * channels) + 1;
95 case AV_CODEC_ID_ADPCM_MS:
96 return (1024 - 7 * channels) * 2 / channels + 2;
102 static int caf_write_header(AVFormatContext *s)
104 AVIOContext *pb = s->pb;
105 AVCodecContext *enc = s->streams[0]->codec;
106 CAFContext *caf = s->priv_data;
107 AVDictionaryEntry *t = NULL;
108 unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
109 int64_t chunk_size = 0;
111 if (s->nb_streams != 1) {
112 av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
113 return AVERROR(EINVAL);
116 switch (enc->codec_id) {
117 case AV_CODEC_ID_AAC:
118 av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
119 return AVERROR_PATCHWELCOME;
122 switch (enc->codec_id) {
123 case AV_CODEC_ID_PCM_S8:
124 case AV_CODEC_ID_PCM_S16LE:
125 case AV_CODEC_ID_PCM_S16BE:
126 case AV_CODEC_ID_PCM_S24LE:
127 case AV_CODEC_ID_PCM_S24BE:
128 case AV_CODEC_ID_PCM_S32LE:
129 case AV_CODEC_ID_PCM_S32BE:
130 case AV_CODEC_ID_PCM_F32LE:
131 case AV_CODEC_ID_PCM_F32BE:
132 case AV_CODEC_ID_PCM_F64LE:
133 case AV_CODEC_ID_PCM_F64BE:
134 case AV_CODEC_ID_PCM_ALAW:
135 case AV_CODEC_ID_PCM_MULAW:
136 codec_tag = MKTAG('l','p','c','m');
140 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
141 return AVERROR_INVALIDDATA;
144 if (!enc->block_align && !pb->seekable) {
145 av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
146 return AVERROR_INVALIDDATA;
149 ffio_wfourcc(pb, "caff"); //< mFileType
150 avio_wb16(pb, 1); //< mFileVersion
151 avio_wb16(pb, 0); //< mFileFlags
153 ffio_wfourcc(pb, "desc"); //< Audio Description chunk
154 avio_wb64(pb, 32); //< mChunkSize
155 avio_wb64(pb, av_double2int(enc->sample_rate)); //< mSampleRate
156 avio_wl32(pb, codec_tag); //< mFormatID
157 avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags
158 avio_wb32(pb, enc->block_align); //< mBytesPerPacket
159 avio_wb32(pb, samples_per_packet(enc->codec_id, enc->channels)); //< mFramesPerPacket
160 avio_wb32(pb, enc->channels); //< mChannelsPerFrame
161 avio_wb32(pb, av_get_bits_per_sample(enc->codec_id)); //< mBitsPerChannel
163 if (enc->channel_layout) {
164 ffio_wfourcc(pb, "chan");
166 ff_mov_write_chan(pb, enc->channel_layout);
169 if (enc->codec_id == AV_CODEC_ID_ALAC) {
170 ffio_wfourcc(pb, "kuki");
171 avio_wb64(pb, 12 + enc->extradata_size);
172 avio_write(pb, "\0\0\0\14frmaalac", 12);
173 avio_write(pb, enc->extradata, enc->extradata_size);
174 } else if (enc->codec_id == AV_CODEC_ID_AMR_NB) {
175 ffio_wfourcc(pb, "kuki");
177 avio_write(pb, "\0\0\0\14frmasamr", 12);
178 avio_wb32(pb, 0x11); /* size */
179 avio_write(pb, "samrFFMP", 8);
180 avio_w8(pb, 0); /* decoder version */
182 avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
183 avio_w8(pb, 0x00); /* Mode change period (no restriction) */
184 avio_w8(pb, 0x01); /* Frames per sample */
185 } else if (enc->codec_id == AV_CODEC_ID_QDM2) {
186 ffio_wfourcc(pb, "kuki");
187 avio_wb64(pb, enc->extradata_size);
188 avio_write(pb, enc->extradata, enc->extradata_size);
191 if (av_dict_count(s->metadata)) {
192 ffio_wfourcc(pb, "info"); //< Information chunk
193 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
194 chunk_size += strlen(t->key) + strlen(t->value) + 2;
196 avio_wb64(pb, chunk_size + 4);
197 avio_wb32(pb, av_dict_count(s->metadata));
199 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
200 avio_put_str(pb, t->key);
201 avio_put_str(pb, t->value);
205 ffio_wfourcc(pb, "data"); //< Audio Data chunk
206 caf->data = avio_tell(pb);
207 avio_wb64(pb, -1); //< mChunkSize
208 avio_wb32(pb, 0); //< mEditCount
214 static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
216 CAFContext *caf = s->priv_data;
218 avio_write(s->pb, pkt->data, pkt->size);
219 if (!s->streams[0]->codec->block_align) {
220 void *pkt_sizes = caf->pkt_sizes;
221 int i, alloc_size = caf->size_entries_used + 5;
222 if (alloc_size < 0) {
223 caf->pkt_sizes = NULL;
225 caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes,
226 &caf->size_buffer_size,
229 if (!caf->pkt_sizes) {
231 return AVERROR(ENOMEM);
233 for (i = 4; i > 0; i--) {
234 unsigned top = pkt->size >> i * 7;
236 caf->pkt_sizes[caf->size_entries_used++] = 128 | top;
238 caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
244 static int caf_write_trailer(AVFormatContext *s)
246 CAFContext *caf = s->priv_data;
247 AVIOContext *pb = s->pb;
248 AVCodecContext *enc = s->streams[0]->codec;
251 int64_t file_size = avio_tell(pb);
253 avio_seek(pb, caf->data, SEEK_SET);
254 avio_wb64(pb, file_size - caf->data - 8);
255 avio_seek(pb, file_size, SEEK_SET);
256 if (!enc->block_align) {
257 ffio_wfourcc(pb, "pakt");
258 avio_wb64(pb, caf->size_entries_used + 24);
259 avio_wb64(pb, caf->packets); ///< mNumberPackets
260 avio_wb64(pb, caf->packets * samples_per_packet(enc->codec_id, enc->channels)); ///< mNumberValidFrames
261 avio_wb32(pb, 0); ///< mPrimingFrames
262 avio_wb32(pb, 0); ///< mRemainderFrames
263 avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
264 caf->size_buffer_size = 0;
268 av_freep(&caf->pkt_sizes);
272 AVOutputFormat ff_caf_muxer = {
274 .long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
275 .mime_type = "audio/x-caf",
277 .priv_data_size = sizeof(CAFContext),
278 .audio_codec = AV_CODEC_ID_PCM_S16BE,
279 .video_codec = AV_CODEC_ID_NONE,
280 .write_header = caf_write_header,
281 .write_packet = caf_write_packet,
282 .write_trailer = caf_write_trailer,
283 .codec_tag = (const AVCodecTag* const []){ff_codec_caf_tags, 0},