FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/omadec.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 92 325 28.3%
Functions: 5 12 41.7%
Branches: 32 177 18.1%
Line Branch Exec Source
1 /*
2 * Sony OpenMG (OMA) demuxer
3 *
4 * Copyright (c) 2008, 2013 Maxim Poliakovski
5 * 2008 Benjamin Larsson
6 * 2011 David Goldwich
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 /**
26 * @file
27 * This is a demuxer for Sony OpenMG Music files
28 *
29 * Known file extensions: ".oma", "aa3"
30 * The format of such files consists of three parts:
31 * - "ea3" header carrying overall info and metadata. Except for starting with
32 * "ea" instead of "ID", it's an ID3v2 header.
33 * - "EA3" header is a Sony-specific header containing information about
34 * the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA),
35 * codec specific info (packet size, sample rate, channels and so on)
36 * and DRM related info (file encryption, content id).
37 * - Sound data organized in packets follow the EA3 header
38 * (can be encrypted using the Sony DRM!).
39 *
40 * Supported decoders: ATRAC3, ATRAC3+, MP3, LPCM
41 */
42
43 #include <inttypes.h>
44
45 #include "libavutil/channel_layout.h"
46 #include "libavutil/mem.h"
47 #include "avformat.h"
48 #include "demux.h"
49 #include "internal.h"
50 #include "libavutil/intreadwrite.h"
51 #include "libavutil/des.h"
52 #include "libavutil/mathematics.h"
53 #include "oma.h"
54 #include "pcm.h"
55 #include "id3v2.h"
56
57
58 static const uint64_t leaf_table[] = {
59 0xd79e8283acea4620, 0x7a9762f445afd0d8,
60 0x354d60a60b8c79f1, 0x584e1cde00b07aee,
61 0x1573cd93da7df623, 0x47f98d79620dd535
62 };
63
64 /** map ATRAC-X channel id to internal channel layout */
65 static const AVChannelLayout oma_chid_to_native_layout[7] = {
66 AV_CHANNEL_LAYOUT_MONO,
67 AV_CHANNEL_LAYOUT_STEREO,
68 AV_CHANNEL_LAYOUT_SURROUND,
69 AV_CHANNEL_LAYOUT_4POINT0,
70 AV_CHANNEL_LAYOUT_5POINT1_BACK,
71 AV_CHANNEL_LAYOUT_6POINT1_BACK,
72 AV_CHANNEL_LAYOUT_7POINT1
73 };
74
75 typedef struct OMAContext {
76 uint64_t content_start;
77 int encrypted;
78 uint16_t k_size;
79 uint16_t e_size;
80 uint16_t i_size;
81 uint16_t s_size;
82 uint32_t rid;
83 uint8_t r_val[24];
84 uint8_t n_val[24];
85 uint8_t m_val[8];
86 uint8_t s_val[8];
87 uint8_t sm_val[8];
88 uint8_t e_val[8];
89 uint8_t iv[8];
90 struct AVDES *av_des;
91
92 int (*read_packet)(AVFormatContext *s, AVPacket *pkt);
93 } OMAContext;
94
95 7 static int oma_read_close(AVFormatContext *s)
96 {
97 7 OMAContext *oc = s->priv_data;
98 7 av_freep(&oc->av_des);
99 7 return 0;
100 }
101
102 ✗ static void hex_log(AVFormatContext *s, int level,
103 const char *name, const uint8_t *value, int len)
104 {
105 char buf[33];
106 ✗ len = FFMIN(len, 16);
107 ✗ if (av_log_get_level() < level)
108 ✗ return;
109 ✗ ff_data_to_hex(buf, value, len, 1);
110 ✗ av_log(s, level, "%s: %s\n", name, buf);
111 }
112
113 ✗ static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val,
114 int len)
115 {
116 ✗ OMAContext *oc = s->priv_data;
117
118 ✗ if (!r_val && !n_val)
119 ✗ return -1;
120
121 ✗ len = FFMIN(len, 16);
122
123 /* use first 64 bits in the third round again */
124 ✗ if (r_val) {
125 ✗ if (r_val != oc->r_val) {
126 ✗ memset(oc->r_val, 0, 24);
127 ✗ memcpy(oc->r_val, r_val, len);
128 }
129 ✗ memcpy(&oc->r_val[16], r_val, 8);
130 }
131 ✗ if (n_val) {
132 ✗ if (n_val != oc->n_val) {
133 ✗ memset(oc->n_val, 0, 24);
134 ✗ memcpy(oc->n_val, n_val, len);
135 }
136 ✗ memcpy(&oc->n_val[16], n_val, 8);
137 }
138
139 ✗ return 0;
140 }
141
142 #define OMA_RPROBE_M_VAL 48 + 1
143
144 ✗ static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
145 const uint8_t *r_val)
146 {
147 ✗ OMAContext *oc = s->priv_data;
148 unsigned int pos;
149 struct AVDES *av_des;
150
151 ✗ if (!enc_header || !r_val ||
152 ✗ size < OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size ||
153 size < OMA_RPROBE_M_VAL)
154 ✗ return -1;
155
156 ✗ av_des = av_des_alloc();
157 ✗ if (!av_des)
158 ✗ return AVERROR(ENOMEM);
159
160 /* m_val */
161 ✗ av_des_init(av_des, r_val, 192, 1);
162 ✗ av_des_crypt(av_des, oc->m_val, &enc_header[48], 1, NULL, 1);
163
164 /* s_val */
165 ✗ av_des_init(av_des, oc->m_val, 64, 0);
166 ✗ av_des_crypt(av_des, oc->s_val, NULL, 1, NULL, 0);
167
168 /* sm_val */
169 ✗ pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size;
170 ✗ av_des_init(av_des, oc->s_val, 64, 0);
171 ✗ av_des_mac(av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3));
172
173 ✗ pos += oc->i_size;
174
175 ✗ av_free(av_des);
176
177 ✗ return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
178 }
179
180 ✗ static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
181 const uint8_t *n_val)
182 {
183 ✗ OMAContext *oc = s->priv_data;
184 uint64_t pos;
185 uint32_t taglen, datalen;
186 struct AVDES *av_des;
187
188 ✗ if (!enc_header || !n_val ||
189 ✗ size < OMA_ENC_HEADER_SIZE + oc->k_size + 4)
190 ✗ return -1;
191
192 ✗ pos = OMA_ENC_HEADER_SIZE + oc->k_size;
193 ✗ if (!memcmp(&enc_header[pos], "EKB ", 4))
194 ✗ pos += 32;
195
196 ✗ if (size < pos + 44)
197 ✗ return -1;
198
199 ✗ if (AV_RB32(&enc_header[pos]) != oc->rid)
200 ✗ av_log(s, AV_LOG_DEBUG, "Mismatching RID\n");
201
202 ✗ taglen = AV_RB32(&enc_header[pos + 32]);
203 ✗ datalen = AV_RB32(&enc_header[pos + 36]) >> 4;
204
205 ✗ pos += 44LL + taglen;
206
207 ✗ if (pos + (((uint64_t)datalen) << 4) > size)
208 ✗ return -1;
209
210 ✗ av_des = av_des_alloc();
211 ✗ if (!av_des)
212 ✗ return AVERROR(ENOMEM);
213
214 ✗ av_des_init(av_des, n_val, 192, 1);
215 ✗ while (datalen-- > 0) {
216 ✗ av_des_crypt(av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
217 ✗ kset(s, oc->r_val, NULL, 16);
218 ✗ if (!rprobe(s, enc_header, size, oc->r_val)) {
219 ✗ av_free(av_des);
220 ✗ return 0;
221 }
222 ✗ pos += 16;
223 }
224
225 ✗ av_free(av_des);
226 ✗ return -1;
227 }
228
229 ✗ static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
230 {
231 ✗ OMAContext *oc = s->priv_data;
232 ✗ ID3v2ExtraMetaGEOB *geob = NULL;
233 uint8_t *gdata;
234
235 ✗ oc->encrypted = 1;
236 ✗ av_log(s, AV_LOG_INFO, "File is encrypted\n");
237
238 /* find GEOB metadata */
239 ✗ for (; em; em = em->next) {
240 ✗ if (strcmp(em->tag, "GEOB"))
241 ✗ continue;
242 ✗ geob = &em->data.geob;
243 ✗ if (!strcmp(geob->description, "OMG_LSI") ||
244 ✗ !strcmp(geob->description, "OMG_BKLSI"))
245 break;
246 }
247 ✗ if (!em) {
248 ✗ av_log(s, AV_LOG_ERROR, "No encryption header found\n");
249 ✗ return AVERROR_INVALIDDATA;
250 }
251
252 ✗ if (geob->datasize < 64) {
253 ✗ av_log(s, AV_LOG_ERROR,
254 "Invalid GEOB data size: %"PRIu32"\n", geob->datasize);
255 ✗ return AVERROR_INVALIDDATA;
256 }
257
258 ✗ gdata = geob->data;
259
260 ✗ if (AV_RB16(gdata) != 1)
261 ✗ av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
262
263 ✗ oc->k_size = AV_RB16(&gdata[2]);
264 ✗ oc->e_size = AV_RB16(&gdata[4]);
265 ✗ oc->i_size = AV_RB16(&gdata[6]);
266 ✗ oc->s_size = AV_RB16(&gdata[8]);
267
268 ✗ if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) {
269 ✗ av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
270 ✗ return AVERROR_INVALIDDATA;
271 }
272 ✗ if (OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size + 8 > geob->datasize ||
273 ✗ OMA_ENC_HEADER_SIZE + 48 > geob->datasize) {
274 ✗ av_log(s, AV_LOG_ERROR, "Too little GEOB data\n");
275 ✗ return AVERROR_INVALIDDATA;
276 }
277 ✗ oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
278 ✗ av_log(s, AV_LOG_DEBUG, "RID: %.8"PRIx32"\n", oc->rid);
279
280 ✗ memcpy(oc->iv, &header[0x58], 8);
281 ✗ hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
282
283 ✗ hex_log(s, AV_LOG_DEBUG, "CBC-MAC",
284 ✗ &gdata[OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size],
285 8);
286
287 ✗ if (s->keylen > 0) {
288 ✗ kset(s, s->key, s->key, s->keylen);
289 }
290 ✗ if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
291 ✗ rprobe(s, gdata, geob->datasize, oc->r_val) < 0 &&
292 ✗ nprobe(s, gdata, geob->datasize, oc->n_val) < 0) {
293 int i;
294 ✗ for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
295 uint8_t buf[16];
296 ✗ AV_WL64(buf, leaf_table[i]);
297 ✗ AV_WL64(&buf[8], leaf_table[i + 1]);
298 ✗ kset(s, buf, buf, 16);
299 ✗ if (!rprobe(s, gdata, geob->datasize, oc->r_val) ||
300 ✗ !nprobe(s, gdata, geob->datasize, oc->n_val))
301 break;
302 }
303 ✗ if (i >= FF_ARRAY_ELEMS(leaf_table)) {
304 ✗ av_log(s, AV_LOG_ERROR, "Invalid key\n");
305 ✗ return AVERROR_INVALIDDATA;
306 }
307 }
308
309 ✗ oc->av_des = av_des_alloc();
310 ✗ if (!oc->av_des)
311 ✗ return AVERROR(ENOMEM);
312
313 /* e_val */
314 ✗ av_des_init(oc->av_des, oc->m_val, 64, 0);
315 ✗ av_des_crypt(oc->av_des, oc->e_val,
316 ✗ &gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
317 ✗ hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
318
319 /* init e_val */
320 ✗ av_des_init(oc->av_des, oc->e_val, 64, 1);
321
322 ✗ return 0;
323 }
324
325 2644 static int read_packet(AVFormatContext *s, AVPacket *pkt)
326 {
327 2644 OMAContext *oc = s->priv_data;
328 2644 AVStream *st = s->streams[0];
329 2644 int packet_size = st->codecpar->block_align;
330 2644 int byte_rate = st->codecpar->bit_rate >> 3;
331 2644 int64_t pos = avio_tell(s->pb);
332 2644 int ret = av_get_packet(s->pb, pkt, packet_size);
333
334
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 2644 if (ret < packet_size)
335 6 pkt->flags |= AV_PKT_FLAG_CORRUPT;
336
337
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 2644 if (ret < 0)
338 4 return ret;
339
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 2640 if (!ret)
340 ✗ return AVERROR_EOF;
341
342 2640 pkt->stream_index = 0;
343
344
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 2640 if (pos >= oc->content_start && byte_rate > 0) {
345 2640 pkt->pts =
346 2640 pkt->dts = av_rescale(pos - oc->content_start, st->time_base.den,
347 2640 byte_rate * (int64_t)st->time_base.num);
348 }
349
350
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 2640 if (oc->encrypted) {
351 /* previous unencrypted block saved in IV for
352 * the next packet (CBC mode) */
353 ✗ if (ret == packet_size)
354 ✗ av_des_crypt(oc->av_des, pkt->data, pkt->data,
355 ✗ (packet_size >> 3), oc->iv, 1);
356 else
357 ✗ memset(oc->iv, 0, 8);
358 }
359
360 2640 return ret;
361 }
362
363 ✗ static int aal_read_packet(AVFormatContext *s, AVPacket *pkt)
364 {
365 ✗ int64_t pos = avio_tell(s->pb);
366 int ret, pts;
367 int packet_size;
368 unsigned tag;
369
370 ✗ if (avio_feof(s->pb))
371 ✗ return AVERROR_EOF;
372
373 ✗ tag = avio_rb24(s->pb);
374 ✗ if (tag == 0)
375 ✗ return AVERROR_EOF;
376 ✗ else if (tag != MKBETAG(0,'B','L','K'))
377 ✗ return AVERROR_INVALIDDATA;
378
379 ✗ avio_skip(s->pb, 1);
380 ✗ packet_size = avio_rb16(s->pb);
381 ✗ avio_skip(s->pb, 2);
382 ✗ pts = avio_rb32(s->pb);
383 ✗ avio_skip(s->pb, 12);
384 ✗ ret = av_get_packet(s->pb, pkt, packet_size);
385 ✗ if (ret < packet_size)
386 ✗ pkt->flags |= AV_PKT_FLAG_CORRUPT;
387
388 ✗ if (ret < 0)
389 ✗ return ret;
390 ✗ if (!ret)
391 ✗ return AVERROR_EOF;
392
393 ✗ pkt->stream_index = 0;
394 ✗ pkt->pos = pos;
395 ✗ if (s->streams[0]->codecpar->codec_id == AV_CODEC_ID_ATRAC3AL) {
396 ✗ pkt->duration = 1024;
397 ✗ pkt->pts = pts * 1024LL;
398 } else {
399 ✗ pkt->duration = 2048;
400 ✗ pkt->pts = pts * 2048LL;
401 }
402
403 ✗ return ret;
404 }
405
406 7 static int oma_read_header(AVFormatContext *s)
407 {
408 int ret, framesize, jsflag, samplerate;
409 uint32_t codec_params, channel_id;
410 int16_t eid;
411 uint8_t buf[EA3_HEADER_SIZE];
412 uint8_t *edata;
413 AVStream *st;
414 ID3v2ExtraMeta *extra_meta;
415 7 OMAContext *oc = s->priv_data;
416
417 7 ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta, 0);
418
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 7 if ((ret = ff_id3v2_parse_chapters(s, extra_meta)) < 0) {
419 ✗ ff_id3v2_free_extra_meta(&extra_meta);
420 ✗ return ret;
421 }
422
423 7 ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
424
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 7 if (ret < EA3_HEADER_SIZE) {
425 ✗ ff_id3v2_free_extra_meta(&extra_meta);
426 ✗ return -1;
427 }
428
429
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 7 if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}), 3) ||
430
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 7 buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
431 ✗ ff_id3v2_free_extra_meta(&extra_meta);
432 ✗ av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
433 ✗ return AVERROR_INVALIDDATA;
434 }
435
436 7 oc->content_start = avio_tell(s->pb);
437
438 /* encrypted file */
439 7 eid = AV_RB16(&buf[6]);
440
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 7 if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
441 ✗ ff_id3v2_free_extra_meta(&extra_meta);
442 ✗ return -1;
443 }
444
445 7 ff_id3v2_free_extra_meta(&extra_meta);
446
447 7 codec_params = AV_RB24(&buf[33]);
448
449 7 st = avformat_new_stream(s, NULL);
450
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 7 if (!st)
451 ✗ return AVERROR(ENOMEM);
452
453 7 st->start_time = 0;
454 7 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
455 7 st->codecpar->codec_tag = buf[32];
456 14 st->codecpar->codec_id = ff_codec_get_id(ff_oma_codec_tags,
457 7 st->codecpar->codec_tag);
458
459 7 oc->read_packet = read_packet;
460
461
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 7 switch (buf[32]) {
462 2 case OMA_CODECID_ATRAC3:
463 2 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
464
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 2 if (!samplerate) {
465 ✗ av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
466 ✗ return AVERROR_INVALIDDATA;
467 }
468
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 2 if (samplerate != 44100)
469 ✗ avpriv_request_sample(s, "Sample rate %d", samplerate);
470
471 2 framesize = (codec_params & 0x3FF) * 8;
472
473 /* get stereo coding mode, 1 for joint-stereo */
474 2 jsflag = (codec_params >> 17) & 1;
475
476 2 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
477 2 st->codecpar->sample_rate = samplerate;
478 2 st->codecpar->bit_rate = st->codecpar->sample_rate * framesize / (1024 / 8);
479
480 /* fake the ATRAC3 extradata
481 * (wav format, makes stream copy to wav work) */
482
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 2 if ((ret = ff_alloc_extradata(st->codecpar, 14)) < 0)
483 ✗ return ret;
484
485 2 edata = st->codecpar->extradata;
486 2 AV_WL16(&edata[0], 1); // always 1
487 2 AV_WL32(&edata[2], samplerate); // samples rate
488 2 AV_WL16(&edata[6], jsflag); // coding mode
489 2 AV_WL16(&edata[8], jsflag); // coding mode
490 2 AV_WL16(&edata[10], 1); // always 1
491 2 AV_WL16(&edata[12], 0); // always 0
492
493 2 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
494 2 break;
495 5 case OMA_CODECID_ATRAC3P:
496 5 channel_id = (codec_params >> 10) & 7;
497
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 5 if (!channel_id) {
498 ✗ av_log(s, AV_LOG_ERROR,
499 "Invalid ATRAC-X channel id: %"PRIu32"\n", channel_id);
500 ✗ return AVERROR_INVALIDDATA;
501 }
502 5 av_channel_layout_copy(&st->codecpar->ch_layout,
503 5 &oma_chid_to_native_layout[channel_id - 1]);
504 5 framesize = ((codec_params & 0x3FF) * 8) + 8;
505 5 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
506
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 5 if (!samplerate) {
507 ✗ av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
508 ✗ return AVERROR_INVALIDDATA;
509 }
510 5 st->codecpar->sample_rate = samplerate;
511 5 st->codecpar->bit_rate = samplerate * framesize / (2048 / 8);
512 5 avpriv_set_pts_info(st, 64, 1, samplerate);
513 5 break;
514 ✗ case OMA_CODECID_AAC:
515 case OMA_CODECID_MP3:
516 ✗ ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
517 ✗ framesize = 1024;
518 ✗ break;
519 ✗ case OMA_CODECID_LPCM:
520 /* PCM 44.1 kHz 16 bit stereo big-endian */
521 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
522 ✗ st->codecpar->sample_rate = 44100;
523 ✗ framesize = 1024;
524 /* bit rate = sample rate x PCM block align (= 4) x 8 */
525 ✗ st->codecpar->bit_rate = st->codecpar->sample_rate * 32;
526 ✗ st->codecpar->bits_per_coded_sample =
527 ✗ av_get_bits_per_sample(st->codecpar->codec_id);
528 ✗ avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
529 ✗ break;
530 ✗ case OMA_CODECID_ATRAC3AL:
531 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
532 ✗ st->codecpar->sample_rate = 44100;
533 ✗ avpriv_set_pts_info(st, 64, 1, 44100);
534 ✗ oc->read_packet = aal_read_packet;
535 ✗ framesize = 4096;
536 ✗ break;
537 ✗ case OMA_CODECID_ATRAC3PAL:
538 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
539 ✗ st->codecpar->sample_rate = 44100;
540 ✗ avpriv_set_pts_info(st, 64, 1, 44100);
541 ✗ oc->read_packet = aal_read_packet;
542 ✗ framesize = 4096;
543 ✗ break;
544 ✗ default:
545 ✗ av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n", buf[32]);
546 ✗ return AVERROR(ENOSYS);
547 }
548
549 7 st->codecpar->block_align = framesize;
550
551 7 return 0;
552 }
553
554 2644 static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
555 {
556 2644 OMAContext *oc = s->priv_data;
557 2644 return oc->read_packet(s, pkt);
558 }
559
560 7186 static int oma_read_probe(const AVProbeData *p)
561 {
562 7186 const uint8_t *buf = p->buf;
563 7186 unsigned tag_len = 0;
564
565
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 7186 if (p->buf_size >= ID3v2_HEADER_SIZE && ff_id3v2_match(buf, ID3v2_EA3_MAGIC))
566 6 tag_len = ff_id3v2_tag_len(buf);
567
568 /* This check cannot overflow as tag_len has at most 28 bits */
569
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 7186 if (p->buf_size < tag_len + 5)
570 /* EA3 header comes late, might be outside of the probe buffer */
571
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 1 return tag_len ? AVPROBE_SCORE_EXTENSION/2 : 0;
572
573 7185 buf += tag_len;
574
575
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 7185 if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
576 6 return AVPROBE_SCORE_MAX;
577 else
578 7179 return 0;
579 }
580
581 ✗ static int oma_read_seek(struct AVFormatContext *s,
582 int stream_index, int64_t timestamp, int flags)
583 {
584 ✗ OMAContext *oc = s->priv_data;
585 ✗ AVStream *st = s->streams[0];
586 int64_t err;
587
588 ✗ if (st->codecpar->codec_id == AV_CODEC_ID_ATRAC3PAL ||
589 ✗ st->codecpar->codec_id == AV_CODEC_ID_ATRAC3AL)
590 ✗ return -1;
591
592 ✗ err = ff_pcm_read_seek(s, stream_index, timestamp, flags);
593 ✗ if (!oc->encrypted)
594 ✗ return err;
595
596 /* readjust IV for CBC */
597 ✗ if (err || avio_tell(s->pb) < oc->content_start)
598 ✗ goto wipe;
599 ✗ if ((err = avio_seek(s->pb, -8, SEEK_CUR)) < 0)
600 ✗ goto wipe;
601 ✗ if ((err = avio_read(s->pb, oc->iv, 8)) < 8) {
602 ✗ if (err >= 0)
603 ✗ err = AVERROR_EOF;
604 ✗ goto wipe;
605 }
606
607 ✗ return 0;
608 ✗ wipe:
609 ✗ memset(oc->iv, 0, 8);
610 ✗ return err;
611 }
612
613 const FFInputFormat ff_oma_demuxer = {
614 .p.name = "oma",
615 .p.long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
616 .p.flags = AVFMT_GENERIC_INDEX,
617 .p.extensions = "oma,omg,aa3",
618 .p.codec_tag = ff_oma_codec_tags_list,
619 .priv_data_size = sizeof(OMAContext),
620 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
621 .read_probe = oma_read_probe,
622 .read_header = oma_read_header,
623 .read_packet = oma_read_packet,
624 .read_seek = oma_read_seek,
625 .read_close = oma_read_close,
626 };
627