FFmpeg  4.4.6
aadec.c
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1 /*
2  * Audible AA demuxer
3  * Copyright (c) 2015 Vesselin Bontchev
4  *
5  * Header parsing is borrowed from https://github.com/jteeuwen/audible project.
6  * Copyright (c) 2001-2014, Jim Teeuwen
7  *
8  * Redistribution and use in source and binary forms, with or without modification,
9  * are permitted provided that the following conditions are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright notice, this
12  * list of conditions and the following disclaimer.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
18  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
21  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #include "avformat.h"
27 #include "internal.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/tea.h"
31 #include "libavutil/opt.h"
32 
33 #define AA_MAGIC 1469084982 /* this identifies an audible .aa file */
34 #define MAX_CODEC_SECOND_SIZE 3982
35 #define MAX_TOC_ENTRIES 16
36 #define MAX_DICTIONARY_ENTRIES 128
37 #define TEA_BLOCK_SIZE 8
38 #define CHAPTER_HEADER_SIZE 8
39 #define TIMEPREC 1000
40 #define MP3_FRAME_SIZE 104
41 
42 typedef struct AADemuxContext {
43  AVClass *class;
49  struct AVTEA *tea_ctx;
56 
57 static int get_second_size(char *codec_name)
58 {
59  int result = -1;
60 
61  if (!strcmp(codec_name, "mp332")) {
62  result = 3982;
63  } else if (!strcmp(codec_name, "acelp16")) {
64  result = 2000;
65  } else if (!strcmp(codec_name, "acelp85")) {
66  result = 1045;
67  }
68 
69  return result;
70 }
71 
73 {
74  int i, j, idx, largest_idx = -1;
75  uint32_t toc_size, npairs, header_seed = 0, start;
76  char codec_name[64] = {0};
77  uint8_t output[24], dst[8], src[8];
78  int64_t largest_size = -1, current_size = -1, chapter_pos;
79  struct toc_entry {
80  uint32_t offset;
81  uint32_t size;
82  } TOC[MAX_TOC_ENTRIES];
83  uint32_t header_key_part[4];
84  uint8_t header_key[16] = {0};
85  AADemuxContext *c = s->priv_data;
86  AVIOContext *pb = s->pb;
87  AVStream *st;
88  int ret;
89 
90  /* parse .aa header */
91  avio_skip(pb, 4); // file size
92  avio_skip(pb, 4); // magic string
93  toc_size = avio_rb32(pb); // TOC size
94  avio_skip(pb, 4); // unidentified integer
95  if (toc_size > MAX_TOC_ENTRIES || toc_size < 2)
96  return AVERROR_INVALIDDATA;
97  for (i = 0; i < toc_size; i++) { // read TOC
98  avio_skip(pb, 4); // TOC entry index
99  TOC[i].offset = avio_rb32(pb); // block offset
100  TOC[i].size = avio_rb32(pb); // block size
101  }
102  avio_skip(pb, 24); // header termination block (ignored)
103  npairs = avio_rb32(pb); // read dictionary entries
104  if (npairs > MAX_DICTIONARY_ENTRIES)
105  return AVERROR_INVALIDDATA;
106  for (i = 0; i < npairs; i++) {
107  char key[128], val[128];
108  uint32_t nkey, nval;
109 
110  avio_skip(pb, 1); // unidentified integer
111  nkey = avio_rb32(pb); // key string length
112  nval = avio_rb32(pb); // value string length
113  avio_get_str(pb, nkey, key, sizeof(key));
114  avio_get_str(pb, nval, val, sizeof(val));
115  if (!strcmp(key, "codec")) {
116  av_log(s, AV_LOG_DEBUG, "Codec is <%s>\n", val);
117  av_strlcpy(codec_name, val, sizeof(codec_name));
118  } else if (!strcmp(key, "HeaderSeed")) {
119  av_log(s, AV_LOG_DEBUG, "HeaderSeed is <%s>\n", val);
120  header_seed = atoi(val);
121  } else if (!strcmp(key, "HeaderKey")) { // this looks like "1234567890 1234567890 1234567890 1234567890"
122  av_log(s, AV_LOG_DEBUG, "HeaderKey is <%s>\n", val);
123 
124  ret = sscanf(val, "%"SCNu32"%"SCNu32"%"SCNu32"%"SCNu32,
125  &header_key_part[0], &header_key_part[1], &header_key_part[2], &header_key_part[3]);
126  if (ret != 4)
127  return AVERROR_INVALIDDATA;
128 
129  for (idx = 0; idx < 4; idx++) {
130  AV_WB32(&header_key[idx * 4], header_key_part[idx]); // convert each part to BE!
131  }
132  av_log(s, AV_LOG_DEBUG, "Processed HeaderKey is ");
133  for (int j = 0; j < 16; j++)
134  av_log(s, AV_LOG_DEBUG, "%02x", header_key[j]);
135  av_log(s, AV_LOG_DEBUG, "\n");
136  } else {
137  av_dict_set(&s->metadata, key, val, 0);
138  }
139  }
140 
141  /* verify fixed key */
142  if (c->aa_fixed_key_len != 16) {
143  av_log(s, AV_LOG_ERROR, "aa_fixed_key value needs to be 16 bytes!\n");
144  return AVERROR(EINVAL);
145  }
146 
147  /* verify codec */
148  if ((c->codec_second_size = get_second_size(codec_name)) == -1) {
149  av_log(s, AV_LOG_ERROR, "unknown codec <%s>!\n", codec_name);
150  return AVERROR(EINVAL);
151  }
152 
153  /* decryption key derivation */
154  c->tea_ctx = av_tea_alloc();
155  if (!c->tea_ctx)
156  return AVERROR(ENOMEM);
157  av_tea_init(c->tea_ctx, c->aa_fixed_key, 16);
158  output[0] = output[1] = 0; // purely for padding purposes
159  memcpy(output + 2, header_key, 16);
160  idx = 0;
161  for (i = 0; i < 3; i++) { // TEA CBC with weird mixed endianness
162  AV_WB32(src, header_seed);
163  AV_WB32(src + 4, header_seed + 1);
164  header_seed += 2;
165  av_tea_crypt(c->tea_ctx, dst, src, 1, NULL, 0); // TEA ECB encrypt
166  for (j = 0; j < TEA_BLOCK_SIZE && idx < 18; j+=1, idx+=1) {
167  output[idx] = output[idx] ^ dst[j];
168  }
169  }
170  memcpy(c->file_key, output + 2, 16); // skip first 2 bytes of output
171  av_log(s, AV_LOG_DEBUG, "File key is ");
172  for (i = 0; i < 16; i++)
173  av_log(s, AV_LOG_DEBUG, "%02x", c->file_key[i]);
174  av_log(s, AV_LOG_DEBUG, "\n");
175 
176  /* decoder setup */
177  st = avformat_new_stream(s, NULL);
178  if (!st) {
179  av_freep(&c->tea_ctx);
180  return AVERROR(ENOMEM);
181  }
183  if (!strcmp(codec_name, "mp332")) {
185  st->codecpar->sample_rate = 22050;
187  avpriv_set_pts_info(st, 64, 8, 32000 * TIMEPREC);
188  // encoded audio frame is MP3_FRAME_SIZE bytes (+1 with padding, unlikely)
189  } else if (!strcmp(codec_name, "acelp85")) {
191  st->codecpar->block_align = 19;
192  st->codecpar->channels = 1;
193  st->codecpar->sample_rate = 8500;
194  st->codecpar->bit_rate = 8500;
196  avpriv_set_pts_info(st, 64, 8, 8500 * TIMEPREC);
197  } else if (!strcmp(codec_name, "acelp16")) {
199  st->codecpar->block_align = 20;
200  st->codecpar->channels = 1;
201  st->codecpar->sample_rate = 16000;
202  st->codecpar->bit_rate = 16000;
204  avpriv_set_pts_info(st, 64, 8, 16000 * TIMEPREC);
205  }
206 
207  /* determine, and jump to audio start offset */
208  for (i = 1; i < toc_size; i++) { // skip the first entry!
209  current_size = TOC[i].size;
210  if (current_size > largest_size) {
211  largest_idx = i;
212  largest_size = current_size;
213  }
214  }
215  start = TOC[largest_idx].offset;
216  avio_seek(pb, start, SEEK_SET);
217 
218  // extract chapter positions. since all formats have constant bit rate, use it
219  // as time base in bytes/s, for easy stream position <-> timestamp conversion
220  st->start_time = 0;
221  c->content_start = start;
222  c->content_end = start + largest_size;
223 
224  while ((chapter_pos = avio_tell(pb)) >= 0 && chapter_pos < c->content_end) {
225  unsigned chapter_idx = s->nb_chapters;
226  uint32_t chapter_size = avio_rb32(pb);
227  if (chapter_size == 0 || avio_feof(pb))
228  break;
229  chapter_pos -= start + CHAPTER_HEADER_SIZE * chapter_idx;
230  avio_skip(pb, 4 + chapter_size);
231  if (!avpriv_new_chapter(s, chapter_idx, st->time_base,
232  chapter_pos * TIMEPREC,
233  (chapter_pos + chapter_size) * TIMEPREC, NULL)) {
234  av_freep(&c->tea_ctx);
235  return AVERROR(ENOMEM);
236  }
237  }
238 
239  st->duration = (largest_size - CHAPTER_HEADER_SIZE * s->nb_chapters) * TIMEPREC;
240 
241  ff_update_cur_dts(s, st, 0);
242  avio_seek(pb, start, SEEK_SET);
243  c->current_chapter_size = 0;
244  c->seek_offset = 0;
245 
246  return 0;
247 }
248 
250 {
251  uint8_t dst[TEA_BLOCK_SIZE];
253  int i;
254  int trailing_bytes;
255  int blocks;
257  int written = 0;
258  int ret;
259  AADemuxContext *c = s->priv_data;
260  uint64_t pos = avio_tell(s->pb);
261 
262  // are we at the end of the audio content?
263  if (pos >= c->content_end) {
264  return AVERROR_EOF;
265  }
266 
267  // are we at the start of a chapter?
268  if (c->current_chapter_size == 0) {
269  c->current_chapter_size = avio_rb32(s->pb);
270  if (c->current_chapter_size == 0) {
271  return AVERROR_EOF;
272  }
273  av_log(s, AV_LOG_DEBUG, "Chapter %d (%" PRId64 " bytes)\n", c->chapter_idx, c->current_chapter_size);
274  c->chapter_idx = c->chapter_idx + 1;
275  avio_skip(s->pb, 4); // data start offset
276  pos += 8;
277  c->current_codec_second_size = c->codec_second_size;
278  }
279 
280  // is this the last block in this chapter?
281  if (c->current_chapter_size / c->current_codec_second_size == 0) {
282  c->current_codec_second_size = c->current_chapter_size % c->current_codec_second_size;
283  }
284 
285  // decrypt c->current_codec_second_size bytes
286  blocks = c->current_codec_second_size / TEA_BLOCK_SIZE;
287  for (i = 0; i < blocks; i++) {
288  ret = avio_read(s->pb, src, TEA_BLOCK_SIZE);
289  if (ret != TEA_BLOCK_SIZE)
290  return (ret < 0) ? ret : AVERROR_EOF;
291  av_tea_init(c->tea_ctx, c->file_key, 16);
292  av_tea_crypt(c->tea_ctx, dst, src, 1, NULL, 1);
293  memcpy(buf + written, dst, TEA_BLOCK_SIZE);
294  written = written + TEA_BLOCK_SIZE;
295  }
296  trailing_bytes = c->current_codec_second_size % TEA_BLOCK_SIZE;
297  if (trailing_bytes != 0) { // trailing bytes are left unencrypted!
298  ret = avio_read(s->pb, src, trailing_bytes);
299  if (ret != trailing_bytes)
300  return (ret < 0) ? ret : AVERROR_EOF;
301  memcpy(buf + written, src, trailing_bytes);
302  written = written + trailing_bytes;
303  }
304 
305  // update state
306  c->current_chapter_size = c->current_chapter_size - c->current_codec_second_size;
307  if (c->current_chapter_size <= 0)
308  c->current_chapter_size = 0;
309 
310  if (c->seek_offset > written)
311  c->seek_offset = 0; // ignore wrong estimate
312 
313  ret = av_new_packet(pkt, written - c->seek_offset);
314  if (ret < 0)
315  return ret;
316  memcpy(pkt->data, buf + c->seek_offset, written - c->seek_offset);
317  pkt->pos = pos;
318 
319  c->seek_offset = 0;
320  return 0;
321 }
322 
324  int stream_index, int64_t timestamp, int flags)
325 {
326  AADemuxContext *c = s->priv_data;
327  AVChapter *ch;
328  int64_t chapter_pos, chapter_start, chapter_size;
329  int chapter_idx = 0;
330 
331  // find chapter containing seek timestamp
332  if (timestamp < 0)
333  timestamp = 0;
334 
335  while (chapter_idx < s->nb_chapters && timestamp >= s->chapters[chapter_idx]->end) {
336  ++chapter_idx;
337  }
338 
339  if (chapter_idx >= s->nb_chapters) {
340  chapter_idx = s->nb_chapters - 1;
341  if (chapter_idx < 0) return -1; // there is no chapter.
342  timestamp = s->chapters[chapter_idx]->end;
343  }
344 
345  ch = s->chapters[chapter_idx];
346 
347  // sync by clamping timestamp to nearest valid block position in its chapter
348  chapter_size = ch->end / TIMEPREC - ch->start / TIMEPREC;
349  chapter_pos = av_rescale_rnd((timestamp - ch->start) / TIMEPREC,
350  1, c->codec_second_size,
352  * c->codec_second_size;
353  if (chapter_pos >= chapter_size)
354  chapter_pos = chapter_size;
355  chapter_start = c->content_start + (ch->start / TIMEPREC) + CHAPTER_HEADER_SIZE * (1 + chapter_idx);
356 
357  // reinit read state
358  avio_seek(s->pb, chapter_start + chapter_pos, SEEK_SET);
359  c->current_codec_second_size = c->codec_second_size;
360  c->current_chapter_size = chapter_size - chapter_pos;
361  c->chapter_idx = 1 + chapter_idx;
362 
363  // for unaligned frames, estimate offset of first frame in block (assume no padding)
364  if (s->streams[0]->codecpar->codec_id == AV_CODEC_ID_MP3) {
365  c->seek_offset = (MP3_FRAME_SIZE - chapter_pos % MP3_FRAME_SIZE) % MP3_FRAME_SIZE;
366  }
367 
368  ff_update_cur_dts(s, s->streams[0], ch->start + (chapter_pos + c->seek_offset) * TIMEPREC);
369 
370  return 1;
371 }
372 
373 static int aa_probe(const AVProbeData *p)
374 {
375  uint8_t *buf = p->buf;
376 
377  // first 4 bytes are file size, next 4 bytes are the magic
378  if (AV_RB32(buf+4) != AA_MAGIC)
379  return 0;
380 
381  return AVPROBE_SCORE_MAX / 2;
382 }
383 
385 {
386  AADemuxContext *c = s->priv_data;
387 
388  av_freep(&c->tea_ctx);
389 
390  return 0;
391 }
392 
393 #define OFFSET(x) offsetof(AADemuxContext, x)
394 static const AVOption aa_options[] = {
395  { "aa_fixed_key", // extracted from libAAX_SDK.so and AAXSDKWin.dll files!
396  "Fixed key used for handling Audible AA files", OFFSET(aa_fixed_key),
397  AV_OPT_TYPE_BINARY, {.str="77214d4b196a87cd520045fd2a51d673"},
398  .flags = AV_OPT_FLAG_DECODING_PARAM },
399  { NULL },
400 };
401 
402 static const AVClass aa_class = {
403  .class_name = "aa",
404  .item_name = av_default_item_name,
405  .option = aa_options,
406  .version = LIBAVUTIL_VERSION_INT,
407 };
408 
410  .name = "aa",
411  .long_name = NULL_IF_CONFIG_SMALL("Audible AA format files"),
412  .priv_class = &aa_class,
413  .priv_data_size = sizeof(AADemuxContext),
414  .extensions = "aa",
415  .read_probe = aa_probe,
421 };
static int aa_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: aadec.c:323
static int aa_read_header(AVFormatContext *s)
Definition: aadec.c:72
#define TEA_BLOCK_SIZE
Definition: aadec.c:37
#define AA_MAGIC
Definition: aadec.c:33
static int aa_probe(const AVProbeData *p)
Definition: aadec.c:373
#define MP3_FRAME_SIZE
Definition: aadec.c:40
#define CHAPTER_HEADER_SIZE
Definition: aadec.c:38
AVInputFormat ff_aa_demuxer
Definition: aadec.c:409
static int get_second_size(char *codec_name)
Definition: aadec.c:57
#define MAX_DICTIONARY_ENTRIES
Definition: aadec.c:36
static const AVClass aa_class
Definition: aadec.c:402
static const AVOption aa_options[]
Definition: aadec.c:394
#define OFFSET(x)
Definition: aadec.c:393
#define MAX_CODEC_SECOND_SIZE
Definition: aadec.c:34
#define MAX_TOC_ENTRIES
Definition: aadec.c:35
#define TIMEPREC
Definition: aadec.c:39
static int aa_read_close(AVFormatContext *s)
Definition: aadec.c:384
static int aa_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aadec.c:249
static double val(void *priv, double ch)
Definition: aeval.c:76
uint8_t
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:470
#define AVFMT_NOGENSEARCH
Format does not allow to fall back on generic search.
Definition: avformat.h:469
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2415
@ AVSTREAM_PARSE_FULL_RAW
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:798
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:860
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:781
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_RB32
Definition: intreadwrite.h:130
#define flags(name, subs,...)
Definition: cbs_av1.c:572
#define s(width, name)
Definition: cbs_vp9.c:257
#define NULL
Definition: coverity.c:32
long long int64_t
Definition: coverity.c:34
Public dictionary API.
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
@ AV_OPT_TYPE_BINARY
offset must point to a pointer immediately followed by an int for the length
Definition: opt.h:231
@ AV_CODEC_ID_SIPR
Definition: codec_id.h:465
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:425
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:58
@ AV_ROUND_DOWN
Round toward -infinity.
Definition: mathematics.h:82
@ AV_ROUND_UP
Round toward +infinity.
Definition: mathematics.h:83
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
void av_tea_init(AVTEA *ctx, const uint8_t key[16], int rounds)
Initialize an AVTEA context.
Definition: tea.c:42
struct AVTEA * av_tea_alloc(void)
Allocate an AVTEA context To free the struct: av_free(ptr)
Definition: tea.c:35
void av_tea_crypt(AVTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.
Definition: tea.c:95
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
const char * key
int i
Definition: input.c:407
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
Update cur_dts of all streams based on the given timestamp and AVStream.
Definition: utils.c:1927
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:4945
AVChapter * avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: utils.c:4639
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
AVOptions.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:279
unsigned int pos
Definition: spdifenc.c:412
int seek_offset
Definition: aadec.c:54
int codec_second_size
Definition: aadec.c:46
struct AVTEA * tea_ctx
Definition: aadec.c:49
int64_t content_end
Definition: aadec.c:53
int64_t current_chapter_size
Definition: aadec.c:51
int chapter_idx
Definition: aadec.c:48
int aa_fixed_key_len
Definition: aadec.c:45
uint8_t * aa_fixed_key
Definition: aadec.c:44
int64_t content_start
Definition: aadec.c:52
int current_codec_second_size
Definition: aadec.c:47
uint8_t file_key[16]
Definition: aadec.c:50
int64_t start
Definition: avformat.h:1192
int64_t end
chapter start/end time in time_base units
Definition: avformat.h:1192
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
int channels
Audio only.
Definition: codec_par.h:166
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int block_align
Audio only.
Definition: codec_par.h:177
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
uint8_t * data
Definition: packet.h:369
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:902
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
Definition: tea.c:30
#define av_freep(p)
#define av_log(a,...)
Public header for libavutil TEA algorithm.
#define src
Definition: vp8dsp.c:255
AVPacket * pkt
Definition: movenc.c:59
int size
static const uint8_t offset[127][2]
Definition: vf_spp.c:107
static double c[64]