FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/cafdec.c
Date: 2024-07-17 14:05:47
Exec Total Coverage
Lines: 173 299 57.9%
Functions: 7 8 87.5%
Branches: 99 217 45.6%

Line Branch Exec Source
1 /*
2 * Core Audio Format demuxer
3 * Copyright (c) 2007 Justin Ruggles
4 * Copyright (c) 2009 Peter Ross
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * Core Audio Format demuxer
26 */
27
28 #include <inttypes.h>
29
30 #include "avformat.h"
31 #include "demux.h"
32 #include "internal.h"
33 #include "isom.h"
34 #include "mov_chan.h"
35 #include "libavcodec/flac.h"
36 #include "libavutil/intreadwrite.h"
37 #include "libavutil/intfloat.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/mem.h"
40 #include "caf.h"
41
42 typedef struct CafContext {
43 int bytes_per_packet; ///< bytes in a packet, or 0 if variable
44 int frames_per_packet; ///< frames in a packet, or 0 if variable
45 int64_t num_bytes; ///< total number of bytes in stream
46
47 int64_t packet_cnt; ///< packet counter
48 int64_t frame_cnt; ///< frame counter
49
50 int64_t data_start; ///< data start position, in bytes
51 int64_t data_size; ///< raw data size, in bytes
52 } CafContext;
53
54 7146 static int probe(const AVProbeData *p)
55 {
56
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7146 if (AV_RB32(p->buf) != MKBETAG('c','a','f','f'))
57 7137 return 0;
58
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9 if (AV_RB16(&p->buf[4]) != 1)
59 return 0;
60
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9 if (AV_RB32(p->buf + 8) != MKBETAG('d','e','s','c'))
61 return 0;
62
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9 if (AV_RB64(p->buf + 12) != 32)
63 return 0;
64 9 return AVPROBE_SCORE_MAX;
65 }
66
67 /** Read audio description chunk */
68 9 static int read_desc_chunk(AVFormatContext *s)
69 {
70 9 AVIOContext *pb = s->pb;
71 9 CafContext *caf = s->priv_data;
72 AVStream *st;
73 int flags;
74
75 /* new audio stream */
76 9 st = avformat_new_stream(s, NULL);
77
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9 if (!st)
78 return AVERROR(ENOMEM);
79
80 /* parse format description */
81 9 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
82 9 st->codecpar->sample_rate = av_clipd(av_int2double(avio_rb64(pb)), 0, INT_MAX);
83 9 st->codecpar->codec_tag = avio_rl32(pb);
84 9 flags = avio_rb32(pb);
85 9 caf->bytes_per_packet = avio_rb32(pb);
86 9 st->codecpar->block_align = caf->bytes_per_packet;
87 9 caf->frames_per_packet = avio_rb32(pb);
88 9 st->codecpar->ch_layout.nb_channels = avio_rb32(pb);
89 9 st->codecpar->bits_per_coded_sample = avio_rb32(pb);
90
91
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9 if (caf->bytes_per_packet < 0 || caf->frames_per_packet < 0 || st->codecpar->ch_layout.nb_channels < 0)
92 return AVERROR_INVALIDDATA;
93
94 /* calculate bit rate for constant size packets */
95
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9 if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
96 6 st->codecpar->bit_rate = (uint64_t)st->codecpar->sample_rate * (uint64_t)caf->bytes_per_packet * 8
97 6 / (uint64_t)caf->frames_per_packet;
98 } else {
99 3 st->codecpar->bit_rate = 0;
100 }
101
102 /* determine codec */
103
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9 if (st->codecpar->codec_tag == MKTAG('l','p','c','m'))
104 4 st->codecpar->codec_id = ff_mov_get_lpcm_codec_id(st->codecpar->bits_per_coded_sample, (flags ^ 0x2) | 0x4);
105 else
106 5 st->codecpar->codec_id = ff_codec_get_id(ff_codec_caf_tags, st->codecpar->codec_tag);
107 9 return 0;
108 }
109
110 /** Read magic cookie chunk */
111 4 static int read_kuki_chunk(AVFormatContext *s, int64_t size)
112 {
113 4 AVIOContext *pb = s->pb;
114 4 AVStream *st = s->streams[0];
115 int ret;
116
117
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4 if (size < 0 || size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
118 return -1;
119
120
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4 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
121 /* The magic cookie format for AAC is an mp4 esds atom.
122 The lavc AAC decoder requires the data from the codec specific
123 description as extradata input. */
124 int strt, skip;
125
126 strt = avio_tell(pb);
127 ff_mov_read_esds(s, pb);
128 skip = size - (avio_tell(pb) - strt);
129 if (skip < 0 || !st->codecpar->extradata ||
130 st->codecpar->codec_id != AV_CODEC_ID_AAC) {
131 av_log(s, AV_LOG_ERROR, "invalid AAC magic cookie\n");
132 return AVERROR_INVALIDDATA;
133 }
134 avio_skip(pb, skip);
135
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4 } else if (st->codecpar->codec_id == AV_CODEC_ID_ALAC) {
136 #define ALAC_PREAMBLE 12
137 #define ALAC_HEADER 36
138 #define ALAC_NEW_KUKI 24
139 uint8_t preamble[12];
140
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2 if (size < ALAC_NEW_KUKI) {
141 av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
142 avio_skip(pb, size);
143 return AVERROR_INVALIDDATA;
144 }
145
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2 if (avio_read(pb, preamble, ALAC_PREAMBLE) != ALAC_PREAMBLE) {
146 av_log(s, AV_LOG_ERROR, "failed to read preamble\n");
147 return AVERROR_INVALIDDATA;
148 }
149
150
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2 if ((ret = ff_alloc_extradata(st->codecpar, ALAC_HEADER)) < 0)
151 return ret;
152
153 /* For the old style cookie, we skip 12 bytes, then read 36 bytes.
154 * The new style cookie only contains the last 24 bytes of what was
155 * 36 bytes in the old style cookie, so we fabricate the first 12 bytes
156 * in that case to maintain compatibility. */
157
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2 if (!memcmp(&preamble[4], "frmaalac", 8)) {
158
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2 if (size < ALAC_PREAMBLE + ALAC_HEADER) {
159 av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
160 av_freep(&st->codecpar->extradata);
161 return AVERROR_INVALIDDATA;
162 }
163
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2 if (avio_read(pb, st->codecpar->extradata, ALAC_HEADER) != ALAC_HEADER) {
164 av_log(s, AV_LOG_ERROR, "failed to read kuki header\n");
165 av_freep(&st->codecpar->extradata);
166 return AVERROR_INVALIDDATA;
167 }
168 2 avio_skip(pb, size - ALAC_PREAMBLE - ALAC_HEADER);
169 } else {
170 AV_WB32(st->codecpar->extradata, 36);
171 memcpy(&st->codecpar->extradata[4], "alac", 4);
172 AV_WB32(&st->codecpar->extradata[8], 0);
173 memcpy(&st->codecpar->extradata[12], preamble, 12);
174 if (avio_read(pb, &st->codecpar->extradata[24], ALAC_NEW_KUKI - 12) != ALAC_NEW_KUKI - 12) {
175 av_log(s, AV_LOG_ERROR, "failed to read new kuki header\n");
176 av_freep(&st->codecpar->extradata);
177 return AVERROR_INVALIDDATA;
178 }
179 avio_skip(pb, size - ALAC_NEW_KUKI);
180 }
181
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2 } else if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) {
182 int last, type, flac_metadata_size;
183 uint8_t buf[4];
184 /* The magic cookie format for FLAC consists mostly of an mp4 dfLa atom. */
185 if (size < (16 + FLAC_STREAMINFO_SIZE)) {
186 av_log(s, AV_LOG_ERROR, "invalid FLAC magic cookie\n");
187 return AVERROR_INVALIDDATA;
188 }
189 /* Check cookie version. */
190 if (avio_r8(pb) != 0) {
191 av_log(s, AV_LOG_ERROR, "unknown FLAC magic cookie\n");
192 return AVERROR_INVALIDDATA;
193 }
194 avio_rb24(pb); /* Flags */
195 /* read dfLa fourcc */
196 if (avio_read(pb, buf, 4) != 4) {
197 av_log(s, AV_LOG_ERROR, "failed to read FLAC magic cookie\n");
198 return pb->error < 0 ? pb->error : AVERROR_INVALIDDATA;
199 }
200 if (memcmp(buf, "dfLa", 4)) {
201 av_log(s, AV_LOG_ERROR, "invalid FLAC magic cookie\n");
202 return AVERROR_INVALIDDATA;
203 }
204 /* Check dfLa version. */
205 if (avio_r8(pb) != 0) {
206 av_log(s, AV_LOG_ERROR, "unknown dfLa version\n");
207 return AVERROR_INVALIDDATA;
208 }
209 avio_rb24(pb); /* Flags */
210 if (avio_read(pb, buf, sizeof(buf)) != sizeof(buf)) {
211 av_log(s, AV_LOG_ERROR, "failed to read FLAC metadata block header\n");
212 return pb->error < 0 ? pb->error : AVERROR_INVALIDDATA;
213 }
214 flac_parse_block_header(buf, &last, &type, &flac_metadata_size);
215 if (type != FLAC_METADATA_TYPE_STREAMINFO || flac_metadata_size != FLAC_STREAMINFO_SIZE) {
216 av_log(s, AV_LOG_ERROR, "STREAMINFO must be first FLACMetadataBlock\n");
217 return AVERROR_INVALIDDATA;
218 }
219 ret = ff_get_extradata(s, st->codecpar, pb, FLAC_STREAMINFO_SIZE);
220 if (ret < 0)
221 return ret;
222 if (!last)
223 av_log(s, AV_LOG_WARNING, "non-STREAMINFO FLACMetadataBlock(s) ignored\n");
224
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2 } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
225 // The data layout for Opus is currently unknown, so we do not export
226 // extradata at all. Multichannel streams are not supported.
227 if (st->codecpar->ch_layout.nb_channels > 2) {
228 avpriv_request_sample(s, "multichannel Opus in CAF");
229 return AVERROR_PATCHWELCOME;
230 }
231 avio_skip(pb, size);
232
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2 } else if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0) {
233 return ret;
234 }
235
236 4 return 0;
237 }
238
239 /** Read packet table chunk */
240 3 static int read_pakt_chunk(AVFormatContext *s, int64_t size)
241 {
242 3 AVIOContext *pb = s->pb;
243 3 AVStream *st = s->streams[0];
244 3 CafContext *caf = s->priv_data;
245 3 int64_t pos = 0, ccount, num_packets;
246 int i;
247 int ret;
248
249 3 ccount = avio_tell(pb);
250
251 3 num_packets = avio_rb64(pb);
252
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3 if (num_packets < 0 || INT32_MAX / sizeof(AVIndexEntry) < num_packets)
253 return AVERROR_INVALIDDATA;
254
255 3 st->nb_frames = avio_rb64(pb); /* valid frames */
256 3 st->nb_frames += avio_rb32(pb); /* priming frames */
257 3 st->nb_frames += avio_rb32(pb); /* remainder frames */
258
259
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3 if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) {
260 st->duration = caf->frames_per_packet * num_packets;
261 pos = caf-> bytes_per_packet * num_packets;
262 } else {
263 3 st->duration = 0;
264
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543 for (i = 0; i < num_packets; i++) {
265
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540 if (avio_feof(pb))
266 return AVERROR_INVALIDDATA;
267 540 ret = av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME);
268
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540 if (ret < 0)
269 return ret;
270
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540 pos += caf->bytes_per_packet ? caf->bytes_per_packet : ff_mp4_read_descr_len(pb);
271
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540 st->duration += caf->frames_per_packet ? caf->frames_per_packet : ff_mp4_read_descr_len(pb);
272 }
273 }
274
275
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3 if (avio_tell(pb) - ccount > size || size > INT64_MAX - ccount) {
276 av_log(s, AV_LOG_ERROR, "error reading packet table\n");
277 return AVERROR_INVALIDDATA;
278 }
279 3 avio_seek(pb, ccount + size, SEEK_SET);
280
281 3 caf->num_bytes = pos;
282 3 return 0;
283 }
284
285 /** Read information chunk */
286 3 static void read_info_chunk(AVFormatContext *s, int64_t size)
287 {
288 3 AVIOContext *pb = s->pb;
289 unsigned int i;
290 3 unsigned int nb_entries = avio_rb32(pb);
291
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30 for (i = 0; i < nb_entries && !avio_feof(pb); i++) {
292 char key[32];
293 char value[1024];
294 27 avio_get_str(pb, INT_MAX, key, sizeof(key));
295 27 avio_get_str(pb, INT_MAX, value, sizeof(value));
296
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27 if (!*key)
297 continue;
298 27 av_dict_set(&s->metadata, key, value, 0);
299 }
300 3 }
301
302 9 static int read_header(AVFormatContext *s)
303 {
304 9 AVIOContext *pb = s->pb;
305 9 CafContext *caf = s->priv_data;
306 AVStream *st;
307 9 uint32_t tag = 0;
308 int found_data, ret;
309 int64_t size, pos;
310
311 9 avio_skip(pb, 8); /* magic, version, file flags */
312
313 /* audio description chunk */
314
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9 if (avio_rb32(pb) != MKBETAG('d','e','s','c')) {
315 av_log(s, AV_LOG_ERROR, "desc chunk not present\n");
316 return AVERROR_INVALIDDATA;
317 }
318 9 size = avio_rb64(pb);
319
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9 if (size != 32)
320 return AVERROR_INVALIDDATA;
321
322 9 ret = read_desc_chunk(s);
323
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9 if (ret)
324 return ret;
325 9 st = s->streams[0];
326
327 /* parse each chunk */
328 9 found_data = 0;
329
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37 while (!avio_feof(pb)) {
330
331 /* stop at data chunk if seeking is not supported or
332 data chunk size is unknown */
333
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37 if (found_data && (caf->data_size < 0 || !(pb->seekable & AVIO_SEEKABLE_NORMAL)))
334 break;
335
336 37 tag = avio_rb32(pb);
337 37 size = avio_rb64(pb);
338 37 pos = avio_tell(pb);
339
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37 if (avio_feof(pb))
340 9 break;
341
342
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28 switch (tag) {
343 9 case MKBETAG('d','a','t','a'):
344 9 avio_skip(pb, 4); /* edit count */
345 9 caf->data_start = avio_tell(pb);
346
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9 caf->data_size = size < 0 ? -1 : size - 4;
347
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9 if (caf->data_start < 0 || caf->data_size > INT64_MAX - caf->data_start)
348 return AVERROR_INVALIDDATA;
349
350
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9 if (caf->data_size > 0 && (pb->seekable & AVIO_SEEKABLE_NORMAL))
351 9 avio_skip(pb, caf->data_size);
352 9 found_data = 1;
353 9 break;
354
355 8 case MKBETAG('c','h','a','n'):
356
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8 if ((ret = ff_mov_read_chan(s, s->pb, st, size)) < 0)
357 return ret;
358 8 break;
359
360 /* magic cookie chunk */
361 4 case MKBETAG('k','u','k','i'):
362
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4 if (read_kuki_chunk(s, size))
363 return AVERROR_INVALIDDATA;
364 4 break;
365
366 /* packet table chunk */
367 3 case MKBETAG('p','a','k','t'):
368
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3 if (read_pakt_chunk(s, size))
369 return AVERROR_INVALIDDATA;
370 3 break;
371
372 3 case MKBETAG('i','n','f','o'):
373 3 read_info_chunk(s, size);
374 3 break;
375
376 default:
377 av_log(s, AV_LOG_WARNING,
378 "skipping CAF chunk: %08"PRIX32" (%s), size %"PRId64"\n",
379 tag, av_fourcc2str(av_bswap32(tag)), size);
380 1 case MKBETAG('f','r','e','e'):
381
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1 if (size < 0 && found_data)
382 goto found_data;
383
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1 if (size < 0)
384 return AVERROR_INVALIDDATA;
385 1 break;
386 }
387
388
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28 if (size > 0 && (pb->seekable & AVIO_SEEKABLE_NORMAL)) {
389
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28 if (pos > INT64_MAX - size)
390 return AVERROR_INVALIDDATA;
391 28 avio_seek(pb, pos + size, SEEK_SET);
392 }
393 }
394
395
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9 if (!found_data)
396 return AVERROR_INVALIDDATA;
397
398 9 found_data:
399
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9 if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) {
400
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6 if (caf->data_size > 0 && caf->data_size / caf->bytes_per_packet < INT64_MAX / caf->frames_per_packet)
401 6 st->nb_frames = (caf->data_size / caf->bytes_per_packet) * caf->frames_per_packet;
402
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3 } else if (ffstream(st)->nb_index_entries && st->duration > 0) {
403
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3 if (st->codecpar->sample_rate && caf->data_size / st->duration > INT64_MAX / st->codecpar->sample_rate / 8) {
404 av_log(s, AV_LOG_ERROR, "Overflow during bit rate calculation %d * 8 * %"PRId64"\n",
405 st->codecpar->sample_rate, caf->data_size / st->duration);
406 return AVERROR_INVALIDDATA;
407 }
408 3 st->codecpar->bit_rate = st->codecpar->sample_rate * 8LL *
409 3 (caf->data_size / st->duration);
410 } else {
411 av_log(s, AV_LOG_ERROR, "Missing packet table. It is required when "
412 "block size or frame size are variable.\n");
413 return AVERROR_INVALIDDATA;
414 }
415
416 9 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
417 9 st->start_time = 0;
418
419 /* position the stream at the start of data */
420
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9 if (caf->data_size >= 0)
421 9 avio_seek(pb, caf->data_start, SEEK_SET);
422
423 9 return 0;
424 }
425
426 #define CAF_MAX_PKT_SIZE 4096
427
428 117 static int read_packet(AVFormatContext *s, AVPacket *pkt)
429 {
430 117 AVIOContext *pb = s->pb;
431 117 AVStream *st = s->streams[0];
432 117 FFStream *const sti = ffstream(st);
433 117 CafContext *caf = s->priv_data;
434 117 int res, pkt_size = 0, pkt_frames = 0;
435 117 int64_t left = CAF_MAX_PKT_SIZE;
436
437
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117 if (avio_feof(pb))
438 return AVERROR_EOF;
439
440 /* don't read past end of data chunk */
441
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117 if (caf->data_size > 0) {
442 117 left = (caf->data_start + caf->data_size) - avio_tell(pb);
443
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117 if (!left)
444 2 return AVERROR_EOF;
445
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115 if (left < 0)
446 return AVERROR(EIO);
447 }
448
449 115 pkt_frames = caf->frames_per_packet;
450 115 pkt_size = caf->bytes_per_packet;
451
452
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115 if (pkt_size > 0 && pkt_frames == 1) {
453 74 pkt_size = (CAF_MAX_PKT_SIZE / pkt_size) * pkt_size;
454 74 pkt_size = FFMIN(pkt_size, left);
455 74 pkt_frames = pkt_size / caf->bytes_per_packet;
456
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41 } else if (sti->nb_index_entries) {
457
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18 if (caf->packet_cnt < sti->nb_index_entries - 1) {
458 18 pkt_size = sti->index_entries[caf->packet_cnt + 1].pos - sti->index_entries[caf->packet_cnt].pos;
459 18 pkt_frames = sti->index_entries[caf->packet_cnt + 1].timestamp - sti->index_entries[caf->packet_cnt].timestamp;
460 } else if (caf->packet_cnt == sti->nb_index_entries - 1) {
461 pkt_size = caf->num_bytes - sti->index_entries[caf->packet_cnt].pos;
462 pkt_frames = st->duration - sti->index_entries[caf->packet_cnt].timestamp;
463 } else {
464 return AVERROR(EIO);
465 }
466 }
467
468
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115 if (pkt_size == 0 || pkt_frames == 0 || pkt_size > left)
469 return AVERROR(EIO);
470
471 115 res = av_get_packet(pb, pkt, pkt_size);
472
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115 if (res < 0)
473 return res;
474
475 115 pkt->size = res;
476 115 pkt->stream_index = 0;
477 115 pkt->dts = pkt->pts = caf->frame_cnt;
478
479 115 caf->packet_cnt++;
480 115 caf->frame_cnt += pkt_frames;
481
482 115 return 0;
483 }
484
485 static int read_seek(AVFormatContext *s, int stream_index,
486 int64_t timestamp, int flags)
487 {
488 AVStream *st = s->streams[0];
489 FFStream *const sti = ffstream(st);
490 CafContext *caf = s->priv_data;
491 int64_t pos, packet_cnt, frame_cnt;
492
493 timestamp = FFMAX(timestamp, 0);
494
495 if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
496 /* calculate new byte position based on target frame position */
497 pos = caf->bytes_per_packet * (timestamp / caf->frames_per_packet);
498 if (caf->data_size > 0)
499 pos = FFMIN(pos, caf->data_size);
500 packet_cnt = pos / caf->bytes_per_packet;
501 frame_cnt = caf->frames_per_packet * packet_cnt;
502 } else if (sti->nb_index_entries) {
503 packet_cnt = av_index_search_timestamp(st, timestamp, flags);
504 frame_cnt = sti->index_entries[packet_cnt].timestamp;
505 pos = sti->index_entries[packet_cnt].pos;
506 } else {
507 return -1;
508 }
509
510 if (avio_seek(s->pb, pos + caf->data_start, SEEK_SET) < 0)
511 return -1;
512
513 caf->packet_cnt = packet_cnt;
514 caf->frame_cnt = frame_cnt;
515
516 return 0;
517 }
518
519 const FFInputFormat ff_caf_demuxer = {
520 .p.name = "caf",
521 .p.long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
522 .p.codec_tag = ff_caf_codec_tags_list,
523 .priv_data_size = sizeof(CafContext),
524 .read_probe = probe,
525 .read_header = read_header,
526 .read_packet = read_packet,
527 .read_seek = read_seek,
528 };
529