omadec.c
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1 /*
2  * Sony OpenMG (OMA) demuxer
3  *
4  * Copyright (c) 2008 Maxim Poliakovski
5  * 2008 Benjamin Larsson
6  * 2011 David Goldwich
7  *
8  * This file is part of Libav.
9  *
10  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
44 #include "avformat.h"
45 #include "internal.h"
46 #include "libavutil/intreadwrite.h"
47 #include "libavutil/des.h"
48 #include "oma.h"
49 #include "pcm.h"
50 #include "id3v2.h"
51 
52 
53 static const uint64_t leaf_table[] = {
54  0xd79e8283acea4620, 0x7a9762f445afd0d8,
55  0x354d60a60b8c79f1, 0x584e1cde00b07aee,
56  0x1573cd93da7df623, 0x47f98d79620dd535
57 };
58 
59 typedef struct OMAContext {
60  uint64_t content_start;
61  int encrypted;
62  uint16_t k_size;
63  uint16_t e_size;
64  uint16_t i_size;
65  uint16_t s_size;
66  uint32_t rid;
73  uint8_t iv[8];
74  struct AVDES av_des;
75 } OMAContext;
76 
77 static void hex_log(AVFormatContext *s, int level, const char *name, const uint8_t *value, int len)
78 {
79  char buf[33];
80  len = FFMIN(len, 16);
81  if (av_log_get_level() < level)
82  return;
83  ff_data_to_hex(buf, value, len, 1);
84  buf[len<<1] = '\0';
85  av_log(s, level, "%s: %s\n", name, buf);
86 }
87 
88 static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val, int len)
89 {
90  OMAContext *oc = s->priv_data;
91 
92  if (!r_val && !n_val)
93  return -1;
94 
95  len = FFMIN(len, 16);
96 
97  /* use first 64 bits in the third round again */
98  if (r_val) {
99  if (r_val != oc->r_val) {
100  memset(oc->r_val, 0, 24);
101  memcpy(oc->r_val, r_val, len);
102  }
103  memcpy(&oc->r_val[16], r_val, 8);
104  }
105  if (n_val) {
106  if (n_val != oc->n_val) {
107  memset(oc->n_val, 0, 24);
108  memcpy(oc->n_val, n_val, len);
109  }
110  memcpy(&oc->n_val[16], n_val, 8);
111  }
112 
113  return 0;
114 }
115 
116 #define OMA_RPROBE_M_VAL 48 + 1
117 
118 static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
119  const uint8_t *r_val)
120 {
121  OMAContext *oc = s->priv_data;
122  unsigned int pos;
123  struct AVDES av_des;
124 
125  if (!enc_header || !r_val ||
126  size < OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size ||
127  size < OMA_RPROBE_M_VAL)
128  return -1;
129 
130  /* m_val */
131  av_des_init(&av_des, r_val, 192, 1);
132  av_des_crypt(&av_des, oc->m_val, &enc_header[48], 1, NULL, 1);
133 
134  /* s_val */
135  av_des_init(&av_des, oc->m_val, 64, 0);
136  av_des_crypt(&av_des, oc->s_val, NULL, 1, NULL, 0);
137 
138  /* sm_val */
139  pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size;
140  av_des_init(&av_des, oc->s_val, 64, 0);
141  av_des_mac(&av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3));
142 
143  pos += oc->i_size;
144 
145  return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
146 }
147 
148 static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
149  const uint8_t *n_val)
150 {
151  OMAContext *oc = s->priv_data;
152  uint64_t pos;
153  uint32_t taglen, datalen;
154  struct AVDES av_des;
155 
156  if (!enc_header || !n_val ||
157  size < OMA_ENC_HEADER_SIZE + oc->k_size + 4)
158  return -1;
159 
160  pos = OMA_ENC_HEADER_SIZE + oc->k_size;
161  if (!memcmp(&enc_header[pos], "EKB ", 4))
162  pos += 32;
163 
164  if (size < pos + 44)
165  return -1;
166 
167  if (AV_RB32(&enc_header[pos]) != oc->rid)
168  av_log(s, AV_LOG_DEBUG, "Mismatching RID\n");
169 
170  taglen = AV_RB32(&enc_header[pos+32]);
171  datalen = AV_RB32(&enc_header[pos+36]) >> 4;
172 
173  pos += 44;
174  if (size - pos < taglen)
175  return -1;
176 
177  pos += taglen;
178 
179  if (datalen << 4 > size - pos)
180  return -1;
181 
182  av_des_init(&av_des, n_val, 192, 1);
183  while (datalen-- > 0) {
184  av_des_crypt(&av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
185  kset(s, oc->r_val, NULL, 16);
186  if (!rprobe(s, enc_header, size, oc->r_val))
187  return 0;
188  pos += 16;
189  }
190 
191  return -1;
192 }
193 
195 {
196  OMAContext *oc = s->priv_data;
197  ID3v2ExtraMetaGEOB *geob = NULL;
198  uint8_t *gdata;
199 
200  oc->encrypted = 1;
201  av_log(s, AV_LOG_INFO, "File is encrypted\n");
202 
203  /* find GEOB metadata */
204  while (em) {
205  if (!strcmp(em->tag, "GEOB") &&
206  (geob = em->data) &&
207  (!strcmp(geob->description, "OMG_LSI") ||
208  !strcmp(geob->description, "OMG_BKLSI"))) {
209  break;
210  }
211  em = em->next;
212  }
213  if (!em) {
214  av_log(s, AV_LOG_ERROR, "No encryption header found\n");
215  return -1;
216  }
217 
218  if (geob->datasize < 64) {
219  av_log(s, AV_LOG_ERROR, "Invalid GEOB data size: %u\n", geob->datasize);
220  return -1;
221  }
222 
223  gdata = geob->data;
224 
225  if (AV_RB16(gdata) != 1)
226  av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
227 
228  oc->k_size = AV_RB16(&gdata[2]);
229  oc->e_size = AV_RB16(&gdata[4]);
230  oc->i_size = AV_RB16(&gdata[6]);
231  oc->s_size = AV_RB16(&gdata[8]);
232 
233  if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) {
234  av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
235  return -1;
236  }
237  if (OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size + 8 > geob->datasize ||
238  OMA_ENC_HEADER_SIZE + 48 > geob->datasize) {
239  av_log(s, AV_LOG_ERROR, "Too little GEOB data\n");
240  return AVERROR_INVALIDDATA;
241  }
242  oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
243  av_log(s, AV_LOG_DEBUG, "RID: %.8x\n", oc->rid);
244 
245  memcpy(oc->iv, &header[0x58], 8);
246  hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
247 
248  hex_log(s, AV_LOG_DEBUG, "CBC-MAC", &gdata[OMA_ENC_HEADER_SIZE+oc->k_size+oc->e_size+oc->i_size], 8);
249 
250  if (s->keylen > 0) {
251  kset(s, s->key, s->key, s->keylen);
252  }
253  if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
254  rprobe(s, gdata, geob->datasize, oc->r_val) < 0 &&
255  nprobe(s, gdata, geob->datasize, oc->n_val) < 0) {
256  int i;
257  for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
258  uint8_t buf[16];
259  AV_WL64(buf, leaf_table[i]);
260  AV_WL64(&buf[8], leaf_table[i+1]);
261  kset(s, buf, buf, 16);
262  if (!rprobe(s, gdata, geob->datasize, oc->r_val) ||
263  !nprobe(s, gdata, geob->datasize, oc->n_val))
264  break;
265  }
266  if (i >= FF_ARRAY_ELEMS(leaf_table)) {
267  av_log(s, AV_LOG_ERROR, "Invalid key\n");
268  return -1;
269  }
270  }
271 
272  /* e_val */
273  av_des_init(&oc->av_des, oc->m_val, 64, 0);
274  av_des_crypt(&oc->av_des, oc->e_val, &gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
275  hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
276 
277  /* init e_val */
278  av_des_init(&oc->av_des, oc->e_val, 64, 1);
279 
280  return 0;
281 }
282 
284 {
285  int ret, framesize, jsflag, samplerate;
286  uint32_t codec_params;
287  int16_t eid;
289  uint8_t *edata;
290  AVStream *st;
291  ID3v2ExtraMeta *extra_meta = NULL;
292  OMAContext *oc = s->priv_data;
293 
294  ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta);
295  ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
296  if (ret < EA3_HEADER_SIZE)
297  return -1;
298 
299  if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
300  av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
301  return -1;
302  }
303 
304  oc->content_start = avio_tell(s->pb);
305 
306  /* encrypted file */
307  eid = AV_RB16(&buf[6]);
308  if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
309  ff_id3v2_free_extra_meta(&extra_meta);
310  return -1;
311  }
312 
313  ff_id3v2_free_extra_meta(&extra_meta);
314 
315  codec_params = AV_RB24(&buf[33]);
316 
317  st = avformat_new_stream(s, NULL);
318  if (!st)
319  return AVERROR(ENOMEM);
320 
321  st->start_time = 0;
323  st->codec->codec_tag = buf[32];
325 
326  switch (buf[32]) {
327  case OMA_CODECID_ATRAC3:
328  samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
329  if (!samplerate) {
330  av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
331  return AVERROR_INVALIDDATA;
332  }
333  if (samplerate != 44100)
334  av_log_ask_for_sample(s, "Unsupported sample rate: %d\n",
335  samplerate);
336 
337  framesize = (codec_params & 0x3FF) * 8;
338  jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */
339  st->codec->channels = 2;
341  st->codec->sample_rate = samplerate;
342  st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
343 
344  /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
345  st->codec->extradata_size = 14;
347  if (!edata)
348  return AVERROR(ENOMEM);
349 
350  st->codec->extradata = edata;
351  AV_WL16(&edata[0], 1); // always 1
352  AV_WL32(&edata[2], samplerate); // samples rate
353  AV_WL16(&edata[6], jsflag); // coding mode
354  AV_WL16(&edata[8], jsflag); // coding mode
355  AV_WL16(&edata[10], 1); // always 1
356  // AV_WL16(&edata[12], 0); // always 0
357 
358  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
359  break;
360  case OMA_CODECID_ATRAC3P:
361  st->codec->channels = (codec_params >> 10) & 7;
362  framesize = ((codec_params & 0x3FF) * 8) + 8;
363  samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
364  if (!samplerate) {
365  av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
366  return AVERROR_INVALIDDATA;
367  }
368  st->codec->sample_rate = samplerate;
369  st->codec->bit_rate = samplerate * framesize * 8 / 1024;
370  avpriv_set_pts_info(st, 64, 1, samplerate);
371  av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
372  break;
373  case OMA_CODECID_MP3:
375  framesize = 1024;
376  break;
377  case OMA_CODECID_LPCM:
378  /* PCM 44.1 kHz 16 bit stereo big-endian */
379  st->codec->channels = 2;
381  st->codec->sample_rate = 44100;
382  framesize = 1024;
383  /* bit rate = sample rate x PCM block align (= 4) x 8 */
384  st->codec->bit_rate = st->codec->sample_rate * 32;
386  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
387  break;
388  default:
389  av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
390  return -1;
391  }
392 
393  st->codec->block_align = framesize;
394 
395  return 0;
396 }
397 
398 
400 {
401  OMAContext *oc = s->priv_data;
402  int packet_size = s->streams[0]->codec->block_align;
403  int ret = av_get_packet(s->pb, pkt, packet_size);
404 
405  if (ret < packet_size)
406  pkt->flags |= AV_PKT_FLAG_CORRUPT;
407 
408  if (ret < 0)
409  return ret;
410  if (!ret)
411  return AVERROR_EOF;
412 
413  pkt->stream_index = 0;
414 
415  if (oc->encrypted) {
416  /* previous unencrypted block saved in IV for
417  * the next packet (CBC mode) */
418  if (ret == packet_size)
419  av_des_crypt(&oc->av_des, pkt->data, pkt->data,
420  (packet_size >> 3), oc->iv, 1);
421  else
422  memset(oc->iv, 0, 8);
423  }
424 
425  return ret;
426 }
427 
429 {
430  const uint8_t *buf;
431  unsigned tag_len = 0;
432 
433  buf = p->buf;
434 
435  if (p->buf_size < ID3v2_HEADER_SIZE ||
437  buf[3] != 3 || // version must be 3
438  buf[4]) // flags byte zero
439  return 0;
440 
441  tag_len = ff_id3v2_tag_len(buf);
442 
443  /* This check cannot overflow as tag_len has at most 28 bits */
444  if (p->buf_size < tag_len + 5)
445  /* EA3 header comes late, might be outside of the probe buffer */
446  return AVPROBE_SCORE_MAX / 2;
447 
448  buf += tag_len;
449 
450  if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
451  return AVPROBE_SCORE_MAX;
452  else
453  return 0;
454 }
455 
456 static int oma_read_seek(struct AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
457 {
458  OMAContext *oc = s->priv_data;
459  int err = ff_pcm_read_seek(s, stream_index, timestamp, flags);
460 
461  if (!oc->encrypted)
462  return err;
463 
464  /* readjust IV for CBC */
465  if (err || avio_tell(s->pb) < oc->content_start)
466  goto wipe;
467  if ((err = avio_seek(s->pb, -8, SEEK_CUR)) < 0)
468  goto wipe;
469  if ((err = avio_read(s->pb, oc->iv, 8)) < 8) {
470  if (err >= 0)
471  err = AVERROR_EOF;
472  goto wipe;
473  }
474 
475  return 0;
476 wipe:
477  memset(oc->iv, 0, 8);
478  return err;
479 }
480 
482  .name = "oma",
483  .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
484  .priv_data_size = sizeof(OMAContext),
490  .extensions = "oma,omg,aa3",
491  .codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
492 };
static int oma_read_header(AVFormatContext *s)
Definition: omadec.c:283
#define AV_WL64(p, d)
Definition: intreadwrite.h:299
void * data
Definition: id3v2.h:57
static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size, const uint8_t *r_val)
Definition: omadec.c:118
int size
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2126
int av_des_init(AVDES *d, const uint8_t *key, int key_bits, int decrypt)
Initializes an AVDES context.
Definition: des.c:289
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:3283
AVInputFormat ff_oma_demuxer
Definition: omadec.c:481
uint8_t r_val[24]
Definition: omadec.c:67
uint8_t sm_val[8]
Definition: omadec.c:71
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
void av_des_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count)
Calculates CBC-MAC using the DES algorithm.
Definition: des.c:335
#define OMA_RPROBE_M_VAL
Definition: omadec.c:116
uint32_t datasize
Definition: id3v2.h:62
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
struct OMAContext OMAContext
uint32_t rid
Definition: omadec.c:66
#define AV_RB24
Definition: intreadwrite.h:64
uint8_t iv[8]
Definition: omadec.c:73
#define ID3v2_EA3_MAGIC
Definition: oma.h:29
#define AV_CH_LAYOUT_STEREO
static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val, int len)
Definition: omadec.c:88
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2141
static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: omadec.c:399
int encrypted
Definition: omadec.c:61
const AVCodecTag ff_oma_codec_tags[]
Definition: oma.c:27
Format I/O context.
Definition: avformat.h:828
#define ID3v2_HEADER_SIZE
Definition: id3v2.h:30
uint8_t
int av_log_get_level(void)
Definition: log.c:163
#define AV_RB32
Definition: intreadwrite.h:130
enum AVStreamParseType need_parsing
Definition: avformat.h:775
#define AV_WL32(p, d)
Definition: intreadwrite.h:255
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1454
const char * name
AVStream ** streams
Definition: avformat.h:876
uint8_t * description
Definition: id3v2.h:65
uint8_t * data
Definition: avcodec.h:915
static int flags
Definition: log.c:42
uint16_t i_size
Definition: omadec.c:64
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:218
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2704
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:446
uint8_t * data
Definition: id3v2.h:66
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1813
void av_log_ask_for_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message asking for a sample.
#define AV_RB16
Definition: intreadwrite.h:53
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
uint64_t content_start
Definition: omadec.c:60
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:703
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2736
struct AVDES av_des
Definition: omadec.c:74
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:921
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2165
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:641
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:341
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:340
int bit_rate
the average bitrate
Definition: avcodec.h:1404
audio channel layout utility functions
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:54
uint16_t s_size
Definition: omadec.c:65
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:26
uint8_t s_val[8]
Definition: omadec.c:70
#define OMA_ENC_HEADER_SIZE
Definition: oma.h:30
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta)
Read an ID3v2 tag, including supported extra metadata.
Definition: id3v2.c:672
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:536
Stream structure.
Definition: avformat.h:622
#define EA3_HEADER_SIZE
Definition: oma.h:28
NULL
Definition: eval.c:52
uint16_t k_size
Definition: omadec.c:62
enum AVMediaType codec_type
Definition: avcodec.h:1347
struct ID3v2ExtraMeta * next
Definition: id3v2.h:58
enum AVCodecID codec_id
Definition: avcodec.h:1350
static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
Definition: omadec.c:194
int sample_rate
samples per second
Definition: avcodec.h:2104
AVIOContext * pb
I/O context.
Definition: avformat.h:861
static void hex_log(AVFormatContext *s, int level, const char *name, const uint8_t *value, int len)
Definition: omadec.c:77
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1365
int extradata_size
Definition: avcodec.h:1455
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
static const uint64_t leaf_table[]
Definition: omadec.c:53
This structure contains the data a format has to probe a file.
Definition: avformat.h:338
static int oma_read_seek(struct AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: omadec.c:456
uint8_t e_val[8]
Definition: omadec.c:72
void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypts / decrypts using the DES algorithm.
Definition: des.c:331
uint8_t level
Definition: svq3.c:133
const uint8_t * key
Definition: avformat.h:927
full parsing and repack
Definition: avformat.h:576
Main libavformat public API header.
uint8_t m_val[8]
Definition: omadec.c:69
int ff_id3v2_match(const uint8_t *buf, const char *magic)
Detect ID3v2 Header.
Definition: id3v2.c:126
int64_t start_time
Decoding: pts of the first frame of the stream, in stream time base.
Definition: avformat.h:677
const char * tag
Definition: id3v2.h:56
static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size, const uint8_t *n_val)
Definition: omadec.c:148
int len
int channels
number of audio channels
Definition: avcodec.h:2105
int ff_id3v2_tag_len(const uint8_t *buf)
Get the length of an ID3v2 tag.
Definition: id3v2.c:139
void * priv_data
Format private data.
Definition: avformat.h:848
uint8_t n_val[24]
Definition: omadec.c:68
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:455
Definition: des.h:27
#define AV_WL16(p, d)
Definition: intreadwrite.h:225
int stream_index
Definition: avcodec.h:917
uint16_t e_size
Definition: omadec.c:63
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:3234
This structure stores compressed data.
Definition: avcodec.h:898
const uint16_t ff_oma_srate_tab[8]
Definition: oma.c:25
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:158
static int oma_read_probe(AVProbeData *p)
Definition: omadec.c:428