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path: root/libavformat/cafenc.c (plain)
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1/*
2 * Core Audio Format muxer
3 * Copyright (c) 2011 Carl Eugen Hoyos
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22#include "avformat.h"
23#include "caf.h"
24#include "isom.h"
25#include "avio_internal.h"
26#include "libavutil/intfloat.h"
27#include "libavutil/dict.h"
28
29typedef struct {
30 int64_t data;
31 uint8_t *pkt_sizes;
32 int size_buffer_size;
33 int size_entries_used;
34 int packets;
35} CAFContext;
36
37static uint32_t codec_flags(enum AVCodecID codec_id) {
38 switch (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
49 default:
50 return 0;
51 }
52}
53
54static uint32_t samples_per_packet(enum AVCodecID codec_id, int channels, int block_align) {
55 switch (codec_id) {
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:
69 return 1;
70 case AV_CODEC_ID_MACE3:
71 case AV_CODEC_ID_MACE6:
72 return 6;
73 case AV_CODEC_ID_ADPCM_IMA_QT:
74 return 64;
75 case AV_CODEC_ID_AMR_NB:
76 case AV_CODEC_ID_GSM:
77 case AV_CODEC_ID_ILBC:
78 case AV_CODEC_ID_QCELP:
79 return 160;
80 case AV_CODEC_ID_GSM_MS:
81 return 320;
82 case AV_CODEC_ID_MP1:
83 return 384;
84 case AV_CODEC_ID_MP2:
85 case AV_CODEC_ID_MP3:
86 return 1152;
87 case AV_CODEC_ID_AC3:
88 return 1536;
89 case AV_CODEC_ID_QDM2:
90 case AV_CODEC_ID_QDMC:
91 return 2048 * channels;
92 case AV_CODEC_ID_ALAC:
93 return 4096;
94 case AV_CODEC_ID_ADPCM_IMA_WAV:
95 return (block_align - 4 * channels) * 8 / (4 * channels) + 1;
96 case AV_CODEC_ID_ADPCM_MS:
97 return (block_align - 7 * channels) * 2 / channels + 2;
98 default:
99 return 0;
100 }
101}
102
103static int caf_write_header(AVFormatContext *s)
104{
105 AVIOContext *pb = s->pb;
106 AVCodecParameters *par = s->streams[0]->codecpar;
107 CAFContext *caf = s->priv_data;
108 AVDictionaryEntry *t = NULL;
109 unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, par->codec_id);
110 int64_t chunk_size = 0;
111 int frame_size = par->frame_size;
112
113 if (s->nb_streams != 1) {
114 av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
115 return AVERROR(EINVAL);
116 }
117
118 switch (par->codec_id) {
119 case AV_CODEC_ID_AAC:
120 av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
121 return AVERROR_PATCHWELCOME;
122 }
123
124 if (!codec_tag) {
125 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
126 return AVERROR_INVALIDDATA;
127 }
128
129 if (!par->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
130 av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
131 return AVERROR_INVALIDDATA;
132 }
133
134 if (par->codec_id != AV_CODEC_ID_MP3 || frame_size != 576)
135 frame_size = samples_per_packet(par->codec_id, par->channels, par->block_align);
136
137 ffio_wfourcc(pb, "caff"); //< mFileType
138 avio_wb16(pb, 1); //< mFileVersion
139 avio_wb16(pb, 0); //< mFileFlags
140
141 ffio_wfourcc(pb, "desc"); //< Audio Description chunk
142 avio_wb64(pb, 32); //< mChunkSize
143 avio_wb64(pb, av_double2int(par->sample_rate)); //< mSampleRate
144 avio_wl32(pb, codec_tag); //< mFormatID
145 avio_wb32(pb, codec_flags(par->codec_id)); //< mFormatFlags
146 avio_wb32(pb, par->block_align); //< mBytesPerPacket
147 avio_wb32(pb, frame_size); //< mFramesPerPacket
148 avio_wb32(pb, par->channels); //< mChannelsPerFrame
149 avio_wb32(pb, av_get_bits_per_sample(par->codec_id)); //< mBitsPerChannel
150
151 if (par->channel_layout) {
152 ffio_wfourcc(pb, "chan");
153 avio_wb64(pb, 12);
154 ff_mov_write_chan(pb, par->channel_layout);
155 }
156
157 if (par->codec_id == AV_CODEC_ID_ALAC) {
158 ffio_wfourcc(pb, "kuki");
159 avio_wb64(pb, 12 + par->extradata_size);
160 avio_write(pb, "\0\0\0\14frmaalac", 12);
161 avio_write(pb, par->extradata, par->extradata_size);
162 } else if (par->codec_id == AV_CODEC_ID_AMR_NB) {
163 ffio_wfourcc(pb, "kuki");
164 avio_wb64(pb, 29);
165 avio_write(pb, "\0\0\0\14frmasamr", 12);
166 avio_wb32(pb, 0x11); /* size */
167 avio_write(pb, "samrFFMP", 8);
168 avio_w8(pb, 0); /* decoder version */
169
170 avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
171 avio_w8(pb, 0x00); /* Mode change period (no restriction) */
172 avio_w8(pb, 0x01); /* Frames per sample */
173 } else if (par->codec_id == AV_CODEC_ID_QDM2 || par->codec_id == AV_CODEC_ID_QDMC) {
174 ffio_wfourcc(pb, "kuki");
175 avio_wb64(pb, par->extradata_size);
176 avio_write(pb, par->extradata, par->extradata_size);
177 }
178
179 ff_standardize_creation_time(s);
180 if (av_dict_count(s->metadata)) {
181 ffio_wfourcc(pb, "info"); //< Information chunk
182 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
183 chunk_size += strlen(t->key) + strlen(t->value) + 2;
184 }
185 avio_wb64(pb, chunk_size + 4);
186 avio_wb32(pb, av_dict_count(s->metadata));
187 t = NULL;
188 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
189 avio_put_str(pb, t->key);
190 avio_put_str(pb, t->value);
191 }
192 }
193
194 ffio_wfourcc(pb, "data"); //< Audio Data chunk
195 caf->data = avio_tell(pb);
196 avio_wb64(pb, -1); //< mChunkSize
197 avio_wb32(pb, 0); //< mEditCount
198
199 avio_flush(pb);
200 return 0;
201}
202
203static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
204{
205 CAFContext *caf = s->priv_data;
206
207 avio_write(s->pb, pkt->data, pkt->size);
208 if (!s->streams[0]->codecpar->block_align) {
209 void *pkt_sizes = caf->pkt_sizes;
210 int i, alloc_size = caf->size_entries_used + 5;
211 if (alloc_size < 0) {
212 caf->pkt_sizes = NULL;
213 } else {
214 caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes,
215 &caf->size_buffer_size,
216 alloc_size);
217 }
218 if (!caf->pkt_sizes) {
219 av_free(pkt_sizes);
220 return AVERROR(ENOMEM);
221 }
222 for (i = 4; i > 0; i--) {
223 unsigned top = pkt->size >> i * 7;
224 if (top)
225 caf->pkt_sizes[caf->size_entries_used++] = 128 | top;
226 }
227 caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
228 caf->packets++;
229 }
230 return 0;
231}
232
233static int caf_write_trailer(AVFormatContext *s)
234{
235 CAFContext *caf = s->priv_data;
236 AVIOContext *pb = s->pb;
237 AVCodecParameters *par = s->streams[0]->codecpar;
238
239 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
240 int64_t file_size = avio_tell(pb);
241
242 avio_seek(pb, caf->data, SEEK_SET);
243 avio_wb64(pb, file_size - caf->data - 8);
244 avio_seek(pb, file_size, SEEK_SET);
245 if (!par->block_align) {
246 ffio_wfourcc(pb, "pakt");
247 avio_wb64(pb, caf->size_entries_used + 24);
248 avio_wb64(pb, caf->packets); ///< mNumberPackets
249 avio_wb64(pb, caf->packets * samples_per_packet(par->codec_id, par->channels, par->block_align)); ///< mNumberValidFrames
250 avio_wb32(pb, 0); ///< mPrimingFrames
251 avio_wb32(pb, 0); ///< mRemainderFrames
252 avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
253 caf->size_buffer_size = 0;
254 }
255 avio_flush(pb);
256 }
257 av_freep(&caf->pkt_sizes);
258 return 0;
259}
260
261AVOutputFormat ff_caf_muxer = {
262 .name = "caf",
263 .long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
264 .mime_type = "audio/x-caf",
265 .extensions = "caf",
266 .priv_data_size = sizeof(CAFContext),
267 .audio_codec = AV_CODEC_ID_PCM_S16BE,
268 .video_codec = AV_CODEC_ID_NONE,
269 .write_header = caf_write_header,
270 .write_packet = caf_write_packet,
271 .write_trailer = caf_write_trailer,
272 .codec_tag = (const AVCodecTag* const []){ff_codec_caf_tags, 0},
273};
274
generated by cgit at 2024-05-17 03:07:16 (GMT)