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.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_QCELP:
79 case AV_CODEC_ID_GSM_MS:
88 case AV_CODEC_ID_ALAC:
89 case AV_CODEC_ID_QDM2:
91 case AV_CODEC_ID_ADPCM_IMA_WAV:
92 return (1024 - 4 * channels) * 8 / (4 * channels) + 1;
93 case AV_CODEC_ID_ADPCM_MS:
94 return (1024 - 7 * channels) * 2 / channels + 2;
100 static int caf_write_header(AVFormatContext *s)
102 AVIOContext *pb = s->pb;
103 AVCodecContext *enc = s->streams[0]->codec;
104 CAFContext *caf = s->priv_data;
105 unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
107 switch (enc->codec_id) {
108 case AV_CODEC_ID_AAC:
109 case AV_CODEC_ID_AC3:
110 av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
111 return AVERROR_PATCHWELCOME;
114 switch (enc->codec_id) {
115 case AV_CODEC_ID_PCM_S8:
116 case AV_CODEC_ID_PCM_S16LE:
117 case AV_CODEC_ID_PCM_S16BE:
118 case AV_CODEC_ID_PCM_S24LE:
119 case AV_CODEC_ID_PCM_S24BE:
120 case AV_CODEC_ID_PCM_S32LE:
121 case AV_CODEC_ID_PCM_S32BE:
122 case AV_CODEC_ID_PCM_F32LE:
123 case AV_CODEC_ID_PCM_F32BE:
124 case AV_CODEC_ID_PCM_F64LE:
125 case AV_CODEC_ID_PCM_F64BE:
126 case AV_CODEC_ID_PCM_ALAW:
127 case AV_CODEC_ID_PCM_MULAW:
128 codec_tag = MKTAG('l','p','c','m');
132 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
133 return AVERROR_INVALIDDATA;
136 if (!enc->block_align && !pb->seekable) {
137 av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
138 return AVERROR_INVALIDDATA;
141 ffio_wfourcc(pb, "caff"); //< mFileType
142 avio_wb16(pb, 1); //< mFileVersion
143 avio_wb16(pb, 0); //< mFileFlags
145 ffio_wfourcc(pb, "desc"); //< Audio Description chunk
146 avio_wb64(pb, 32); //< mChunkSize
147 avio_wb64(pb, av_double2int(enc->sample_rate)); //< mSampleRate
148 avio_wl32(pb, codec_tag); //< mFormatID
149 avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags
150 avio_wb32(pb, enc->block_align); //< mBytesPerPacket
151 avio_wb32(pb, samples_per_packet(enc->codec_id, enc->channels)); //< mFramesPerPacket
152 avio_wb32(pb, enc->channels); //< mChannelsPerFrame
153 avio_wb32(pb, av_get_bits_per_sample(enc->codec_id)); //< mBitsPerChannel
155 if (enc->channel_layout) {
156 ffio_wfourcc(pb, "chan");
158 ff_mov_write_chan(pb, enc->channel_layout);
161 if (enc->codec_id == AV_CODEC_ID_ALAC) {
162 ffio_wfourcc(pb, "kuki");
163 avio_wb64(pb, 12 + enc->extradata_size);
164 avio_write(pb, "\0\0\0\14frmaalac", 12);
165 avio_write(pb, enc->extradata, enc->extradata_size);
166 } else if (enc->codec_id == AV_CODEC_ID_AMR_NB) {
167 ffio_wfourcc(pb, "kuki");
169 avio_write(pb, "\0\0\0\14frmasamr", 12);
170 avio_wb32(pb, 0x11); /* size */
171 avio_write(pb, "samrFFMP", 8);
172 avio_w8(pb, 0); /* decoder version */
174 avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
175 avio_w8(pb, 0x00); /* Mode change period (no restriction) */
176 avio_w8(pb, 0x01); /* Frames per sample */
177 } else if (enc->codec_id == AV_CODEC_ID_QDM2) {
178 ffio_wfourcc(pb, "kuki");
179 avio_wb64(pb, enc->extradata_size);
180 avio_write(pb, enc->extradata, enc->extradata_size);
183 ffio_wfourcc(pb, "data"); //< Audio Data chunk
184 caf->data = avio_tell(pb);
185 avio_wb64(pb, -1); //< mChunkSize
186 avio_wb32(pb, 0); //< mEditCount
192 static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
194 CAFContext *caf = s->priv_data;
196 avio_write(s->pb, pkt->data, pkt->size);
197 if (!s->streams[0]->codec->block_align) {
198 void *pkt_sizes = caf->pkt_sizes;
199 int i, alloc_size = caf->size_entries_used + 5;
200 if (alloc_size < 0) {
201 caf->pkt_sizes = NULL;
203 caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes,
204 &caf->size_buffer_size,
207 if (!caf->pkt_sizes) {
209 return AVERROR(ENOMEM);
211 for (i = 4; i > 0; i--) {
212 unsigned top = pkt->size >> i * 7;
214 caf->pkt_sizes[caf->size_entries_used++] = 128 | top;
216 caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
222 static int caf_write_trailer(AVFormatContext *s)
224 AVIOContext *pb = s->pb;
225 AVCodecContext *enc = s->streams[0]->codec;
228 CAFContext *caf = s->priv_data;
229 int64_t file_size = avio_tell(pb);
231 avio_seek(pb, caf->data, SEEK_SET);
232 avio_wb64(pb, file_size - caf->data - 8);
233 avio_seek(pb, file_size, SEEK_SET);
234 if (!enc->block_align) {
235 ffio_wfourcc(pb, "pakt");
236 avio_wb64(pb, caf->size_entries_used + 24);
237 avio_wb64(pb, caf->packets); ///< mNumberPackets
238 avio_wb64(pb, caf->packets * samples_per_packet(enc->codec_id, enc->channels)); ///< mNumberValidFrames
239 avio_wb32(pb, 0); ///< mPrimingFrames
240 avio_wb32(pb, 0); ///< mRemainderFrames
241 avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
242 av_freep(&caf->pkt_sizes);
243 caf->size_buffer_size = 0;
250 AVOutputFormat ff_caf_muxer = {
252 .long_name = NULL_IF_CONFIG_SMALL("Apple Core Audio Format"),
253 .mime_type = "audio/x-caf",
255 .priv_data_size = sizeof(CAFContext),
256 .audio_codec = AV_CODEC_ID_PCM_S16BE,
257 .video_codec = AV_CODEC_ID_NONE,
258 .write_header = caf_write_header,
259 .write_packet = caf_write_packet,
260 .write_trailer = caf_write_trailer,
261 .codec_tag= (const AVCodecTag* const []){ff_codec_caf_tags, 0},