FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/omadec.c
Date: 2023-09-24 13:02:57
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 "avformat.h"
47 #include "internal.h"
48 #include "libavutil/intreadwrite.h"
49 #include "libavutil/des.h"
50 #include "libavutil/mathematics.h"
51 #include "oma.h"
52 #include "pcm.h"
53 #include "id3v2.h"
54
55
56 static const uint64_t leaf_table[] = {
57 0xd79e8283acea4620, 0x7a9762f445afd0d8,
58 0x354d60a60b8c79f1, 0x584e1cde00b07aee,
59 0x1573cd93da7df623, 0x47f98d79620dd535
60 };
61
62 /** map ATRAC-X channel id to internal channel layout */
63 static const AVChannelLayout oma_chid_to_native_layout[7] = {
64 AV_CHANNEL_LAYOUT_MONO,
65 AV_CHANNEL_LAYOUT_STEREO,
66 AV_CHANNEL_LAYOUT_SURROUND,
67 AV_CHANNEL_LAYOUT_4POINT0,
68 AV_CHANNEL_LAYOUT_5POINT1_BACK,
69 AV_CHANNEL_LAYOUT_6POINT1_BACK,
70 AV_CHANNEL_LAYOUT_7POINT1
71 };
72
73 typedef struct OMAContext {
74 uint64_t content_start;
75 int encrypted;
76 uint16_t k_size;
77 uint16_t e_size;
78 uint16_t i_size;
79 uint16_t s_size;
80 uint32_t rid;
81 uint8_t r_val[24];
82 uint8_t n_val[24];
83 uint8_t m_val[8];
84 uint8_t s_val[8];
85 uint8_t sm_val[8];
86 uint8_t e_val[8];
87 uint8_t iv[8];
88 struct AVDES *av_des;
89
90 int (*read_packet)(AVFormatContext *s, AVPacket *pkt);
91 } OMAContext;
92
93 7 static int oma_read_close(AVFormatContext *s)
94 {
95 7 OMAContext *oc = s->priv_data;
96 7 av_freep(&oc->av_des);
97 7 return 0;
98 }
99
100 ✗ static void hex_log(AVFormatContext *s, int level,
101 const char *name, const uint8_t *value, int len)
102 {
103 char buf[33];
104 ✗ len = FFMIN(len, 16);
105 ✗ if (av_log_get_level() < level)
106 ✗ return;
107 ✗ ff_data_to_hex(buf, value, len, 1);
108 ✗ av_log(s, level, "%s: %s\n", name, buf);
109 }
110
111 ✗ static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val,
112 int len)
113 {
114 ✗ OMAContext *oc = s->priv_data;
115
116 ✗ if (!r_val && !n_val)
117 ✗ return -1;
118
119 ✗ len = FFMIN(len, 16);
120
121 /* use first 64 bits in the third round again */
122 ✗ if (r_val) {
123 ✗ if (r_val != oc->r_val) {
124 ✗ memset(oc->r_val, 0, 24);
125 ✗ memcpy(oc->r_val, r_val, len);
126 }
127 ✗ memcpy(&oc->r_val[16], r_val, 8);
128 }
129 ✗ if (n_val) {
130 ✗ if (n_val != oc->n_val) {
131 ✗ memset(oc->n_val, 0, 24);
132 ✗ memcpy(oc->n_val, n_val, len);
133 }
134 ✗ memcpy(&oc->n_val[16], n_val, 8);
135 }
136
137 ✗ return 0;
138 }
139
140 #define OMA_RPROBE_M_VAL 48 + 1
141
142 ✗ static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
143 const uint8_t *r_val)
144 {
145 ✗ OMAContext *oc = s->priv_data;
146 unsigned int pos;
147 struct AVDES *av_des;
148
149 ✗ if (!enc_header || !r_val ||
150 ✗ size < OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size ||
151 size < OMA_RPROBE_M_VAL)
152 ✗ return -1;
153
154 ✗ av_des = av_des_alloc();
155 ✗ if (!av_des)
156 ✗ return AVERROR(ENOMEM);
157
158 /* m_val */
159 ✗ av_des_init(av_des, r_val, 192, 1);
160 ✗ av_des_crypt(av_des, oc->m_val, &enc_header[48], 1, NULL, 1);
161
162 /* s_val */
163 ✗ av_des_init(av_des, oc->m_val, 64, 0);
164 ✗ av_des_crypt(av_des, oc->s_val, NULL, 1, NULL, 0);
165
166 /* sm_val */
167 ✗ pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size;
168 ✗ av_des_init(av_des, oc->s_val, 64, 0);
169 ✗ av_des_mac(av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3));
170
171 ✗ pos += oc->i_size;
172
173 ✗ av_free(av_des);
174
175 ✗ return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
176 }
177
178 ✗ static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
179 const uint8_t *n_val)
180 {
181 ✗ OMAContext *oc = s->priv_data;
182 uint64_t pos;
183 uint32_t taglen, datalen;
184 struct AVDES *av_des;
185
186 ✗ if (!enc_header || !n_val ||
187 ✗ size < OMA_ENC_HEADER_SIZE + oc->k_size + 4)
188 ✗ return -1;
189
190 ✗ pos = OMA_ENC_HEADER_SIZE + oc->k_size;
191 ✗ if (!memcmp(&enc_header[pos], "EKB ", 4))
192 ✗ pos += 32;
193
194 ✗ if (size < pos + 44)
195 ✗ return -1;
196
197 ✗ if (AV_RB32(&enc_header[pos]) != oc->rid)
198 ✗ av_log(s, AV_LOG_DEBUG, "Mismatching RID\n");
199
200 ✗ taglen = AV_RB32(&enc_header[pos + 32]);
201 ✗ datalen = AV_RB32(&enc_header[pos + 36]) >> 4;
202
203 ✗ pos += 44LL + taglen;
204
205 ✗ if (pos + (((uint64_t)datalen) << 4) > size)
206 ✗ return -1;
207
208 ✗ av_des = av_des_alloc();
209 ✗ if (!av_des)
210 ✗ return AVERROR(ENOMEM);
211
212 ✗ av_des_init(av_des, n_val, 192, 1);
213 ✗ while (datalen-- > 0) {
214 ✗ av_des_crypt(av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
215 ✗ kset(s, oc->r_val, NULL, 16);
216 ✗ if (!rprobe(s, enc_header, size, oc->r_val)) {
217 ✗ av_free(av_des);
218 ✗ return 0;
219 }
220 ✗ pos += 16;
221 }
222
223 ✗ av_free(av_des);
224 ✗ return -1;
225 }
226
227 ✗ static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
228 {
229 ✗ OMAContext *oc = s->priv_data;
230 ✗ ID3v2ExtraMetaGEOB *geob = NULL;
231 uint8_t *gdata;
232
233 ✗ oc->encrypted = 1;
234 ✗ av_log(s, AV_LOG_INFO, "File is encrypted\n");
235
236 /* find GEOB metadata */
237 ✗ for (; em; em = em->next) {
238 ✗ if (strcmp(em->tag, "GEOB"))
239 ✗ continue;
240 ✗ geob = &em->data.geob;
241 ✗ if (!strcmp(geob->description, "OMG_LSI") ||
242 ✗ !strcmp(geob->description, "OMG_BKLSI"))
243 break;
244 }
245 ✗ if (!em) {
246 ✗ av_log(s, AV_LOG_ERROR, "No encryption header found\n");
247 ✗ return AVERROR_INVALIDDATA;
248 }
249
250 ✗ if (geob->datasize < 64) {
251 ✗ av_log(s, AV_LOG_ERROR,
252 "Invalid GEOB data size: %"PRIu32"\n", geob->datasize);
253 ✗ return AVERROR_INVALIDDATA;
254 }
255
256 ✗ gdata = geob->data;
257
258 ✗ if (AV_RB16(gdata) != 1)
259 ✗ av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
260
261 ✗ oc->k_size = AV_RB16(&gdata[2]);
262 ✗ oc->e_size = AV_RB16(&gdata[4]);
263 ✗ oc->i_size = AV_RB16(&gdata[6]);
264 ✗ oc->s_size = AV_RB16(&gdata[8]);
265
266 ✗ if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) {
267 ✗ av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
268 ✗ return AVERROR_INVALIDDATA;
269 }
270 ✗ if (OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size + 8 > geob->datasize ||
271 ✗ OMA_ENC_HEADER_SIZE + 48 > geob->datasize) {
272 ✗ av_log(s, AV_LOG_ERROR, "Too little GEOB data\n");
273 ✗ return AVERROR_INVALIDDATA;
274 }
275 ✗ oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
276 ✗ av_log(s, AV_LOG_DEBUG, "RID: %.8"PRIx32"\n", oc->rid);
277
278 ✗ memcpy(oc->iv, &header[0x58], 8);
279 ✗ hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
280
281 ✗ hex_log(s, AV_LOG_DEBUG, "CBC-MAC",
282 ✗ &gdata[OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size],
283 8);
284
285 ✗ if (s->keylen > 0) {
286 ✗ kset(s, s->key, s->key, s->keylen);
287 }
288 ✗ if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
289 ✗ rprobe(s, gdata, geob->datasize, oc->r_val) < 0 &&
290 ✗ nprobe(s, gdata, geob->datasize, oc->n_val) < 0) {
291 int i;
292 ✗ for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
293 uint8_t buf[16];
294 ✗ AV_WL64(buf, leaf_table[i]);
295 ✗ AV_WL64(&buf[8], leaf_table[i + 1]);
296 ✗ kset(s, buf, buf, 16);
297 ✗ if (!rprobe(s, gdata, geob->datasize, oc->r_val) ||
298 ✗ !nprobe(s, gdata, geob->datasize, oc->n_val))
299 break;
300 }
301 ✗ if (i >= FF_ARRAY_ELEMS(leaf_table)) {
302 ✗ av_log(s, AV_LOG_ERROR, "Invalid key\n");
303 ✗ return AVERROR_INVALIDDATA;
304 }
305 }
306
307 ✗ oc->av_des = av_des_alloc();
308 ✗ if (!oc->av_des)
309 ✗ return AVERROR(ENOMEM);
310
311 /* e_val */
312 ✗ av_des_init(oc->av_des, oc->m_val, 64, 0);
313 ✗ av_des_crypt(oc->av_des, oc->e_val,
314 ✗ &gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
315 ✗ hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
316
317 /* init e_val */
318 ✗ av_des_init(oc->av_des, oc->e_val, 64, 1);
319
320 ✗ return 0;
321 }
322
323 2642 static int read_packet(AVFormatContext *s, AVPacket *pkt)
324 {
325 2642 OMAContext *oc = s->priv_data;
326 2642 AVStream *st = s->streams[0];
327 2642 int packet_size = st->codecpar->block_align;
328 2642 int byte_rate = st->codecpar->bit_rate >> 3;
329 2642 int64_t pos = avio_tell(s->pb);
330 2642 int ret = av_get_packet(s->pb, pkt, packet_size);
331
332
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 2642 if (ret < packet_size)
333 6 pkt->flags |= AV_PKT_FLAG_CORRUPT;
334
335
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 2642 if (ret < 0)
336 4 return ret;
337
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 2638 if (!ret)
338 ✗ return AVERROR_EOF;
339
340 2638 pkt->stream_index = 0;
341
342
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 2638 if (pos >= oc->content_start && byte_rate > 0) {
343 2638 pkt->pts =
344 2638 pkt->dts = av_rescale(pos - oc->content_start, st->time_base.den,
345 2638 byte_rate * (int64_t)st->time_base.num);
346 }
347
348
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 2638 if (oc->encrypted) {
349 /* previous unencrypted block saved in IV for
350 * the next packet (CBC mode) */
351 ✗ if (ret == packet_size)
352 ✗ av_des_crypt(oc->av_des, pkt->data, pkt->data,
353 ✗ (packet_size >> 3), oc->iv, 1);
354 else
355 ✗ memset(oc->iv, 0, 8);
356 }
357
358 2638 return ret;
359 }
360
361 ✗ static int aal_read_packet(AVFormatContext *s, AVPacket *pkt)
362 {
363 ✗ int64_t pos = avio_tell(s->pb);
364 int ret, pts;
365 int packet_size;
366 unsigned tag;
367
368 ✗ if (avio_feof(s->pb))
369 ✗ return AVERROR_EOF;
370
371 ✗ tag = avio_rb24(s->pb);
372 ✗ if (tag == 0)
373 ✗ return AVERROR_EOF;
374 ✗ else if (tag != MKBETAG(0,'B','L','K'))
375 ✗ return AVERROR_INVALIDDATA;
376
377 ✗ avio_skip(s->pb, 1);
378 ✗ packet_size = avio_rb16(s->pb);
379 ✗ avio_skip(s->pb, 2);
380 ✗ pts = avio_rb32(s->pb);
381 ✗ avio_skip(s->pb, 12);
382 ✗ ret = av_get_packet(s->pb, pkt, packet_size);
383 ✗ if (ret < packet_size)
384 ✗ pkt->flags |= AV_PKT_FLAG_CORRUPT;
385
386 ✗ if (ret < 0)
387 ✗ return ret;
388 ✗ if (!ret)
389 ✗ return AVERROR_EOF;
390
391 ✗ pkt->stream_index = 0;
392 ✗ pkt->pos = pos;
393 ✗ if (s->streams[0]->codecpar->codec_id == AV_CODEC_ID_ATRAC3AL) {
394 ✗ pkt->duration = 1024;
395 ✗ pkt->pts = pts * 1024LL;
396 } else {
397 ✗ pkt->duration = 2048;
398 ✗ pkt->pts = pts * 2048LL;
399 }
400
401 ✗ return ret;
402 }
403
404 7 static int oma_read_header(AVFormatContext *s)
405 {
406 int ret, framesize, jsflag, samplerate;
407 uint32_t codec_params, channel_id;
408 int16_t eid;
409 uint8_t buf[EA3_HEADER_SIZE];
410 uint8_t *edata;
411 AVStream *st;
412 ID3v2ExtraMeta *extra_meta;
413 7 OMAContext *oc = s->priv_data;
414
415 7 ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta, 0);
416
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 7 if ((ret = ff_id3v2_parse_chapters(s, extra_meta)) < 0) {
417 ✗ ff_id3v2_free_extra_meta(&extra_meta);
418 ✗ return ret;
419 }
420
421 7 ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
422
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 7 if (ret < EA3_HEADER_SIZE) {
423 ✗ ff_id3v2_free_extra_meta(&extra_meta);
424 ✗ return -1;
425 }
426
427
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 7 if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}), 3) ||
428
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 7 buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
429 ✗ ff_id3v2_free_extra_meta(&extra_meta);
430 ✗ av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
431 ✗ return AVERROR_INVALIDDATA;
432 }
433
434 7 oc->content_start = avio_tell(s->pb);
435
436 /* encrypted file */
437 7 eid = AV_RB16(&buf[6]);
438
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 7 if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
439 ✗ ff_id3v2_free_extra_meta(&extra_meta);
440 ✗ return -1;
441 }
442
443 7 ff_id3v2_free_extra_meta(&extra_meta);
444
445 7 codec_params = AV_RB24(&buf[33]);
446
447 7 st = avformat_new_stream(s, NULL);
448
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 7 if (!st)
449 ✗ return AVERROR(ENOMEM);
450
451 7 st->start_time = 0;
452 7 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
453 7 st->codecpar->codec_tag = buf[32];
454 14 st->codecpar->codec_id = ff_codec_get_id(ff_oma_codec_tags,
455 7 st->codecpar->codec_tag);
456
457 7 oc->read_packet = read_packet;
458
459
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 7 switch (buf[32]) {
460 2 case OMA_CODECID_ATRAC3:
461 2 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
462
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 2 if (!samplerate) {
463 ✗ av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
464 ✗ return AVERROR_INVALIDDATA;
465 }
466
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 2 if (samplerate != 44100)
467 ✗ avpriv_request_sample(s, "Sample rate %d", samplerate);
468
469 2 framesize = (codec_params & 0x3FF) * 8;
470
471 /* get stereo coding mode, 1 for joint-stereo */
472 2 jsflag = (codec_params >> 17) & 1;
473
474 2 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
475 2 st->codecpar->sample_rate = samplerate;
476 2 st->codecpar->bit_rate = st->codecpar->sample_rate * framesize / (1024 / 8);
477
478 /* fake the ATRAC3 extradata
479 * (wav format, makes stream copy to wav work) */
480
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 2 if ((ret = ff_alloc_extradata(st->codecpar, 14)) < 0)
481 ✗ return ret;
482
483 2 edata = st->codecpar->extradata;
484 2 AV_WL16(&edata[0], 1); // always 1
485 2 AV_WL32(&edata[2], samplerate); // samples rate
486 2 AV_WL16(&edata[6], jsflag); // coding mode
487 2 AV_WL16(&edata[8], jsflag); // coding mode
488 2 AV_WL16(&edata[10], 1); // always 1
489 2 AV_WL16(&edata[12], 0); // always 0
490
491 2 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
492 2 break;
493 5 case OMA_CODECID_ATRAC3P:
494 5 channel_id = (codec_params >> 10) & 7;
495
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 5 if (!channel_id) {
496 ✗ av_log(s, AV_LOG_ERROR,
497 "Invalid ATRAC-X channel id: %"PRIu32"\n", channel_id);
498 ✗ return AVERROR_INVALIDDATA;
499 }
500 5 av_channel_layout_copy(&st->codecpar->ch_layout,
501 5 &oma_chid_to_native_layout[channel_id - 1]);
502 5 framesize = ((codec_params & 0x3FF) * 8) + 8;
503 5 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
504
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 5 if (!samplerate) {
505 ✗ av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
506 ✗ return AVERROR_INVALIDDATA;
507 }
508 5 st->codecpar->sample_rate = samplerate;
509 5 st->codecpar->bit_rate = samplerate * framesize / (2048 / 8);
510 5 avpriv_set_pts_info(st, 64, 1, samplerate);
511 5 break;
512 ✗ case OMA_CODECID_MP3:
513 ✗ ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
514 ✗ framesize = 1024;
515 ✗ break;
516 ✗ case OMA_CODECID_LPCM:
517 /* PCM 44.1 kHz 16 bit stereo big-endian */
518 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
519 ✗ st->codecpar->sample_rate = 44100;
520 ✗ framesize = 1024;
521 /* bit rate = sample rate x PCM block align (= 4) x 8 */
522 ✗ st->codecpar->bit_rate = st->codecpar->sample_rate * 32;
523 ✗ st->codecpar->bits_per_coded_sample =
524 ✗ av_get_bits_per_sample(st->codecpar->codec_id);
525 ✗ avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
526 ✗ break;
527 ✗ case OMA_CODECID_ATRAC3AL:
528 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
529 ✗ st->codecpar->sample_rate = 44100;
530 ✗ avpriv_set_pts_info(st, 64, 1, 44100);
531 ✗ oc->read_packet = aal_read_packet;
532 ✗ framesize = 4096;
533 ✗ break;
534 ✗ case OMA_CODECID_ATRAC3PAL:
535 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
536 ✗ st->codecpar->sample_rate = 44100;
537 ✗ avpriv_set_pts_info(st, 64, 1, 44100);
538 ✗ oc->read_packet = aal_read_packet;
539 ✗ framesize = 4096;
540 ✗ break;
541 ✗ default:
542 ✗ av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n", buf[32]);
543 ✗ return AVERROR(ENOSYS);
544 }
545
546 7 st->codecpar->block_align = framesize;
547
548 7 return 0;
549 }
550
551 2642 static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
552 {
553 2642 OMAContext *oc = s->priv_data;
554 2642 return oc->read_packet(s, pkt);
555 }
556
557 6938 static int oma_read_probe(const AVProbeData *p)
558 {
559 6938 const uint8_t *buf = p->buf;
560 6938 unsigned tag_len = 0;
561
562
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 6938 if (p->buf_size >= ID3v2_HEADER_SIZE && ff_id3v2_match(buf, ID3v2_EA3_MAGIC))
563 6 tag_len = ff_id3v2_tag_len(buf);
564
565 /* This check cannot overflow as tag_len has at most 28 bits */
566
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 6938 if (p->buf_size < tag_len + 5)
567 /* EA3 header comes late, might be outside of the probe buffer */
568
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 1 return tag_len ? AVPROBE_SCORE_EXTENSION/2 : 0;
569
570 6937 buf += tag_len;
571
572
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 6937 if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
573 6 return AVPROBE_SCORE_MAX;
574 else
575 6931 return 0;
576 }
577
578 ✗ static int oma_read_seek(struct AVFormatContext *s,
579 int stream_index, int64_t timestamp, int flags)
580 {
581 ✗ OMAContext *oc = s->priv_data;
582 ✗ AVStream *st = s->streams[0];
583 int64_t err;
584
585 ✗ if (st->codecpar->codec_id == AV_CODEC_ID_ATRAC3PAL ||
586 ✗ st->codecpar->codec_id == AV_CODEC_ID_ATRAC3AL)
587 ✗ return -1;
588
589 ✗ err = ff_pcm_read_seek(s, stream_index, timestamp, flags);
590 ✗ if (!oc->encrypted)
591 ✗ return err;
592
593 /* readjust IV for CBC */
594 ✗ if (err || avio_tell(s->pb) < oc->content_start)
595 ✗ goto wipe;
596 ✗ if ((err = avio_seek(s->pb, -8, SEEK_CUR)) < 0)
597 ✗ goto wipe;
598 ✗ if ((err = avio_read(s->pb, oc->iv, 8)) < 8) {
599 ✗ if (err >= 0)
600 ✗ err = AVERROR_EOF;
601 ✗ goto wipe;
602 }
603
604 ✗ return 0;
605 ✗ wipe:
606 ✗ memset(oc->iv, 0, 8);
607 ✗ return err;
608 }
609
610 const AVInputFormat ff_oma_demuxer = {
611 .name = "oma",
612 .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
613 .priv_data_size = sizeof(OMAContext),
614 .flags_internal = FF_FMT_INIT_CLEANUP,
615 .read_probe = oma_read_probe,
616 .read_header = oma_read_header,
617 .read_packet = oma_read_packet,
618 .read_seek = oma_read_seek,
619 .read_close = oma_read_close,
620 .flags = AVFMT_GENERIC_INDEX,
621 .extensions = "oma,omg,aa3",
622 .codec_tag = ff_oma_codec_tags_list,
623 };
624