FFmpeg
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;
52  int64_t content_start;
53  int64_t content_end;
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 nkey, nval, toc_size, npairs, header_seed = 0, start;
76  char key[128], val[128], 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  memset(val, 0, sizeof(val));
108  memset(key, 0, sizeof(key));
109  avio_skip(pb, 1); // unidentified integer
110  nkey = avio_rb32(pb); // key string length
111  nval = avio_rb32(pb); // value string length
112  avio_get_str(pb, nkey, key, sizeof(key));
113  avio_get_str(pb, nval, val, sizeof(val));
114  if (!strcmp(key, "codec")) {
115  av_log(s, AV_LOG_DEBUG, "Codec is <%s>\n", val);
116  strncpy(codec_name, val, sizeof(codec_name) - 1);
117  } else if (!strcmp(key, "HeaderSeed")) {
118  av_log(s, AV_LOG_DEBUG, "HeaderSeed is <%s>\n", val);
119  header_seed = atoi(val);
120  } else if (!strcmp(key, "HeaderKey")) { // this looks like "1234567890 1234567890 1234567890 1234567890"
121  av_log(s, AV_LOG_DEBUG, "HeaderKey is <%s>\n", val);
122 
123  ret = sscanf(val, "%"SCNu32"%"SCNu32"%"SCNu32"%"SCNu32,
124  &header_key_part[0], &header_key_part[1], &header_key_part[2], &header_key_part[3]);
125  if (ret != 4)
126  return AVERROR_INVALIDDATA;
127 
128  for (idx = 0; idx < 4; idx++) {
129  AV_WB32(&header_key[idx * 4], header_key_part[idx]); // convert each part to BE!
130  }
131  av_log(s, AV_LOG_DEBUG, "Processed HeaderKey is ");
132  for (i = 0; i < 16; i++)
133  av_log(s, AV_LOG_DEBUG, "%02x", header_key[i]);
134  av_log(s, AV_LOG_DEBUG, "\n");
135  } else {
136  av_dict_set(&s->metadata, key, val, 0);
137  }
138  }
139 
140  /* verify fixed key */
141  if (c->aa_fixed_key_len != 16) {
142  av_log(s, AV_LOG_ERROR, "aa_fixed_key value needs to be 16 bytes!\n");
143  return AVERROR(EINVAL);
144  }
145 
146  /* verify codec */
147  if ((c->codec_second_size = get_second_size(codec_name)) == -1) {
148  av_log(s, AV_LOG_ERROR, "unknown codec <%s>!\n", codec_name);
149  return AVERROR(EINVAL);
150  }
151 
152  /* decryption key derivation */
153  c->tea_ctx = av_tea_alloc();
154  if (!c->tea_ctx)
155  return AVERROR(ENOMEM);
156  av_tea_init(c->tea_ctx, c->aa_fixed_key, 16);
157  output[0] = output[1] = 0; // purely for padding purposes
158  memcpy(output + 2, header_key, 16);
159  idx = 0;
160  for (i = 0; i < 3; i++) { // TEA CBC with weird mixed endianness
161  AV_WB32(src, header_seed);
162  AV_WB32(src + 4, header_seed + 1);
163  header_seed += 2;
164  av_tea_crypt(c->tea_ctx, dst, src, 1, NULL, 0); // TEA ECB encrypt
165  for (j = 0; j < TEA_BLOCK_SIZE && idx < 18; j+=1, idx+=1) {
166  output[idx] = output[idx] ^ dst[j];
167  }
168  }
169  memcpy(c->file_key, output + 2, 16); // skip first 2 bytes of output
170  av_log(s, AV_LOG_DEBUG, "File key is ");
171  for (i = 0; i < 16; i++)
172  av_log(s, AV_LOG_DEBUG, "%02x", c->file_key[i]);
173  av_log(s, AV_LOG_DEBUG, "\n");
174 
175  /* decoder setup */
176  st = avformat_new_stream(s, NULL);
177  if (!st) {
178  av_freep(&c->tea_ctx);
179  return AVERROR(ENOMEM);
180  }
182  if (!strcmp(codec_name, "mp332")) {
184  st->codecpar->sample_rate = 22050;
186  avpriv_set_pts_info(st, 64, 8, 32000 * TIMEPREC);
187  // encoded audio frame is MP3_FRAME_SIZE bytes (+1 with padding, unlikely)
188  } else if (!strcmp(codec_name, "acelp85")) {
190  st->codecpar->block_align = 19;
191  st->codecpar->channels = 1;
192  st->codecpar->sample_rate = 8500;
193  st->codecpar->bit_rate = 8500;
195  avpriv_set_pts_info(st, 64, 8, 8500 * TIMEPREC);
196  } else if (!strcmp(codec_name, "acelp16")) {
198  st->codecpar->block_align = 20;
199  st->codecpar->channels = 1;
200  st->codecpar->sample_rate = 16000;
201  st->codecpar->bit_rate = 16000;
203  avpriv_set_pts_info(st, 64, 8, 16000 * TIMEPREC);
204  }
205 
206  /* determine, and jump to audio start offset */
207  for (i = 1; i < toc_size; i++) { // skip the first entry!
208  current_size = TOC[i].size;
209  if (current_size > largest_size) {
210  largest_idx = i;
211  largest_size = current_size;
212  }
213  }
214  start = TOC[largest_idx].offset;
215  avio_seek(pb, start, SEEK_SET);
216 
217  // extract chapter positions. since all formats have constant bit rate, use it
218  // as time base in bytes/s, for easy stream position <-> timestamp conversion
219  st->start_time = 0;
220  c->content_start = start;
221  c->content_end = start + largest_size;
222 
223  while ((chapter_pos = avio_tell(pb)) >= 0 && chapter_pos < c->content_end) {
224  int chapter_idx = s->nb_chapters;
225  uint32_t chapter_size = avio_rb32(pb);
226  if (chapter_size == 0 || avio_feof(pb))
227  break;
228  chapter_pos -= start + CHAPTER_HEADER_SIZE * chapter_idx;
229  avio_skip(pb, 4 + chapter_size);
230  if (!avpriv_new_chapter(s, chapter_idx, st->time_base,
231  chapter_pos * TIMEPREC, (chapter_pos + chapter_size) * TIMEPREC, NULL))
232  return AVERROR(ENOMEM);
233  }
234 
235  st->duration = (largest_size - CHAPTER_HEADER_SIZE * s->nb_chapters) * TIMEPREC;
236 
237  ff_update_cur_dts(s, st, 0);
238  avio_seek(pb, start, SEEK_SET);
239  c->current_chapter_size = 0;
240  c->seek_offset = 0;
241 
242  return 0;
243 }
244 
246 {
247  uint8_t dst[TEA_BLOCK_SIZE];
249  int i;
250  int trailing_bytes;
251  int blocks;
253  int written = 0;
254  int ret;
255  AADemuxContext *c = s->priv_data;
256  uint64_t pos = avio_tell(s->pb);
257 
258  // are we at the end of the audio content?
259  if (pos >= c->content_end) {
260  return AVERROR_EOF;
261  }
262 
263  // are we at the start of a chapter?
264  if (c->current_chapter_size == 0) {
265  c->current_chapter_size = avio_rb32(s->pb);
266  if (c->current_chapter_size == 0) {
267  return AVERROR_EOF;
268  }
269  av_log(s, AV_LOG_DEBUG, "Chapter %d (%" PRId64 " bytes)\n", c->chapter_idx, c->current_chapter_size);
270  c->chapter_idx = c->chapter_idx + 1;
271  avio_skip(s->pb, 4); // data start offset
272  pos += 8;
273  c->current_codec_second_size = c->codec_second_size;
274  }
275 
276  // is this the last block in this chapter?
277  if (c->current_chapter_size / c->current_codec_second_size == 0) {
278  c->current_codec_second_size = c->current_chapter_size % c->current_codec_second_size;
279  }
280 
281  // decrypt c->current_codec_second_size bytes
282  blocks = c->current_codec_second_size / TEA_BLOCK_SIZE;
283  for (i = 0; i < blocks; i++) {
284  ret = avio_read(s->pb, src, TEA_BLOCK_SIZE);
285  if (ret != TEA_BLOCK_SIZE)
286  return (ret < 0) ? ret : AVERROR_EOF;
287  av_tea_init(c->tea_ctx, c->file_key, 16);
288  av_tea_crypt(c->tea_ctx, dst, src, 1, NULL, 1);
289  memcpy(buf + written, dst, TEA_BLOCK_SIZE);
290  written = written + TEA_BLOCK_SIZE;
291  }
292  trailing_bytes = c->current_codec_second_size % TEA_BLOCK_SIZE;
293  if (trailing_bytes != 0) { // trailing bytes are left unencrypted!
294  ret = avio_read(s->pb, src, trailing_bytes);
295  if (ret != trailing_bytes)
296  return (ret < 0) ? ret : AVERROR_EOF;
297  memcpy(buf + written, src, trailing_bytes);
298  written = written + trailing_bytes;
299  }
300 
301  // update state
302  c->current_chapter_size = c->current_chapter_size - c->current_codec_second_size;
303  if (c->current_chapter_size <= 0)
304  c->current_chapter_size = 0;
305 
306  if (c->seek_offset > written)
307  c->seek_offset = 0; // ignore wrong estimate
308 
309  ret = av_new_packet(pkt, written - c->seek_offset);
310  if (ret < 0)
311  return ret;
312  memcpy(pkt->data, buf + c->seek_offset, written - c->seek_offset);
313  pkt->pos = pos;
314 
315  c->seek_offset = 0;
316  return 0;
317 }
318 
320  int stream_index, int64_t timestamp, int flags)
321 {
322  AADemuxContext *c = s->priv_data;
323  AVChapter *ch;
324  int64_t chapter_pos, chapter_start, chapter_size;
325  int chapter_idx = 0;
326 
327  // find chapter containing seek timestamp
328  if (timestamp < 0)
329  timestamp = 0;
330 
331  while (chapter_idx < s->nb_chapters && timestamp >= s->chapters[chapter_idx]->end) {
332  ++chapter_idx;
333  }
334 
335  if (chapter_idx >= s->nb_chapters) {
336  chapter_idx = s->nb_chapters - 1;
337  if (chapter_idx < 0) return -1; // there is no chapter.
338  timestamp = s->chapters[chapter_idx]->end;
339  }
340 
341  ch = s->chapters[chapter_idx];
342 
343  // sync by clamping timestamp to nearest valid block position in its chapter
344  chapter_size = ch->end / TIMEPREC - ch->start / TIMEPREC;
345  chapter_pos = av_rescale_rnd((timestamp - ch->start) / TIMEPREC,
346  1, c->codec_second_size,
348  * c->codec_second_size;
349  if (chapter_pos >= chapter_size)
350  chapter_pos = chapter_size;
351  chapter_start = c->content_start + (ch->start / TIMEPREC) + CHAPTER_HEADER_SIZE * (1 + chapter_idx);
352 
353  // reinit read state
354  avio_seek(s->pb, chapter_start + chapter_pos, SEEK_SET);
355  c->current_codec_second_size = c->codec_second_size;
356  c->current_chapter_size = chapter_size - chapter_pos;
357  c->chapter_idx = 1 + chapter_idx;
358 
359  // for unaligned frames, estimate offset of first frame in block (assume no padding)
360  if (s->streams[0]->codecpar->codec_id == AV_CODEC_ID_MP3) {
361  c->seek_offset = (MP3_FRAME_SIZE - chapter_pos % MP3_FRAME_SIZE) % MP3_FRAME_SIZE;
362  }
363 
364  ff_update_cur_dts(s, s->streams[0], ch->start + (chapter_pos + c->seek_offset) * TIMEPREC);
365 
366  return 1;
367 }
368 
369 static int aa_probe(const AVProbeData *p)
370 {
371  uint8_t *buf = p->buf;
372 
373  // first 4 bytes are file size, next 4 bytes are the magic
374  if (AV_RB32(buf+4) != AA_MAGIC)
375  return 0;
376 
377  return AVPROBE_SCORE_MAX / 2;
378 }
379 
381 {
382  AADemuxContext *c = s->priv_data;
383 
384  av_freep(&c->tea_ctx);
385 
386  return 0;
387 }
388 
389 #define OFFSET(x) offsetof(AADemuxContext, x)
390 static const AVOption aa_options[] = {
391  { "aa_fixed_key", // extracted from libAAX_SDK.so and AAXSDKWin.dll files!
392  "Fixed key used for handling Audible AA files", OFFSET(aa_fixed_key),
393  AV_OPT_TYPE_BINARY, {.str="77214d4b196a87cd520045fd2a51d673"},
394  .flags = AV_OPT_FLAG_DECODING_PARAM },
395  { NULL },
396 };
397 
398 static const AVClass aa_class = {
399  .class_name = "aa",
400  .item_name = av_default_item_name,
401  .option = aa_options,
402  .version = LIBAVUTIL_VERSION_INT,
403 };
404 
406  .name = "aa",
407  .long_name = NULL_IF_CONFIG_SMALL("Audible AA format files"),
408  .priv_class = &aa_class,
409  .priv_data_size = sizeof(AADemuxContext),
410  .extensions = "aa",
411  .read_probe = aa_probe,
417 };
AADemuxContext::content_end
int64_t content_end
Definition: aadec.c:53
AVFMT_NO_BYTE_SEEK
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:475
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4480
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3953
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
aa_read_packet
static int aa_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aadec.c:245
ch
uint8_t pi<< 24) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_U8,(uint64_t)((*(const uint8_t *) pi - 0x80U))<< 56) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16,(*(const int16_t *) pi >>8)+0x80) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_S16,(uint64_t)(*(const int16_t *) pi)<< 48) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32,(*(const int32_t *) pi >>24)+0x80) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_S32,(uint64_t)(*(const int32_t *) pi)<< 32) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S64,(*(const int64_t *) pi >>56)+0x80) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S64, *(const int64_t *) pi *(1.0f/(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S64, *(const int64_t *) pi *(1.0/(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_FLT, llrintf(*(const float *) pi *(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_DBL, llrint(*(const double *) pi *(INT64_C(1)<< 63))) #define FMT_PAIR_FUNC(out, in) static conv_func_type *const fmt_pair_to_conv_functions[AV_SAMPLE_FMT_NB *AV_SAMPLE_FMT_NB]={ FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S64), };static void cpy1(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, len);} static void cpy2(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 2 *len);} static void cpy4(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 4 *len);} static void cpy8(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 8 *len);} AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, const int *ch_map, int flags) { AudioConvert *ctx;conv_func_type *f=fmt_pair_to_conv_functions[av_get_packed_sample_fmt(out_fmt)+AV_SAMPLE_FMT_NB *av_get_packed_sample_fmt(in_fmt)];if(!f) return NULL;ctx=av_mallocz(sizeof(*ctx));if(!ctx) return NULL;if(channels==1){ in_fmt=av_get_planar_sample_fmt(in_fmt);out_fmt=av_get_planar_sample_fmt(out_fmt);} ctx->channels=channels;ctx->conv_f=f;ctx->ch_map=ch_map;if(in_fmt==AV_SAMPLE_FMT_U8||in_fmt==AV_SAMPLE_FMT_U8P) memset(ctx->silence, 0x80, sizeof(ctx->silence));if(out_fmt==in_fmt &&!ch_map) { switch(av_get_bytes_per_sample(in_fmt)){ case 1:ctx->simd_f=cpy1;break;case 2:ctx->simd_f=cpy2;break;case 4:ctx->simd_f=cpy4;break;case 8:ctx->simd_f=cpy8;break;} } if(HAVE_X86ASM &&1) swri_audio_convert_init_x86(ctx, out_fmt, in_fmt, channels);if(ARCH_ARM) swri_audio_convert_init_arm(ctx, out_fmt, in_fmt, channels);if(ARCH_AARCH64) swri_audio_convert_init_aarch64(ctx, out_fmt, in_fmt, channels);return ctx;} void swri_audio_convert_free(AudioConvert **ctx) { av_freep(ctx);} int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len) { int ch;int off=0;const int os=(out->planar ? 1 :out->ch_count) *out->bps;unsigned misaligned=0;av_assert0(ctx->channels==out->ch_count);if(ctx->in_simd_align_mask) { int planes=in->planar ? in->ch_count :1;unsigned m=0;for(ch=0;ch< planes;ch++) m|=(intptr_t) in->ch[ch];misaligned|=m &ctx->in_simd_align_mask;} if(ctx->out_simd_align_mask) { int planes=out->planar ? out->ch_count :1;unsigned m=0;for(ch=0;ch< planes;ch++) m|=(intptr_t) out->ch[ch];misaligned|=m &ctx->out_simd_align_mask;} if(ctx->simd_f &&!ctx->ch_map &&!misaligned){ off=len &~15;av_assert1(off >=0);av_assert1(off<=len);av_assert2(ctx->channels==SWR_CH_MAX||!in->ch[ctx->channels]);if(off >0){ if(out->planar==in->planar){ int planes=out->planar ? out->ch_count :1;for(ch=0;ch< planes;ch++){ ctx->simd_f(out-> ch ch
Definition: audioconvert.c:56
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
TIMEPREC
#define TIMEPREC
Definition: aadec.c:39
AVPacket::data
uint8_t * data
Definition: avcodec.h:1477
AVOption
AVOption.
Definition: opt.h:246
aa_read_seek
static int aa_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: aadec.c:319
av_tea_crypt
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
aa_read_close
static int aa_read_close(AVFormatContext *s)
Definition: aadec.c:380
aa_class
static const AVClass aa_class
Definition: aadec.c:398
AADemuxContext::tea_ctx
struct AVTEA * tea_ctx
Definition: aadec.c:49
AADemuxContext::aa_fixed_key
uint8_t * aa_fixed_key
Definition: aadec.c:44
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
AADemuxContext::aa_fixed_key_len
int aa_fixed_key_len
Definition: aadec.c:45
AADemuxContext::codec_second_size
int codec_second_size
Definition: aadec.c:46
AVCodecParameters::channels
int channels
Audio only.
Definition: avcodec.h:4063
MAX_DICTIONARY_ENTRIES
#define MAX_DICTIONARY_ENTRIES
Definition: aadec.c:36
AV_OPT_TYPE_BINARY
@ AV_OPT_TYPE_BINARY
offset must point to a pointer immediately followed by an int for the length
Definition: opt.h:229
start
void INT64 start
Definition: avisynth_c.h:767
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
AVChapter
Definition: avformat.h:1299
AV_ROUND_UP
@ AV_ROUND_UP
Round toward +infinity.
Definition: mathematics.h:83
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:565
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:919
src
#define src
Definition: vp8dsp.c:254
AV_CODEC_ID_SIPR
@ AV_CODEC_ID_SIPR
Definition: avcodec.h:605
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:800
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
buf
void * buf
Definition: avisynth_c.h:766
AVInputFormat
Definition: avformat.h:640
tea.h
Public header for libavutil TEA algorithm.
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
AVStream::need_parsing
enum AVStreamParseType need_parsing
Definition: avformat.h:1088
AA_MAGIC
#define AA_MAGIC
Definition: aadec.c:33
key
const char * key
Definition: hwcontext_opencl.c:168
aa_options
static const AVOption aa_options[]
Definition: aadec.c:390
aa_probe
static int aa_probe(const AVProbeData *p)
Definition: aadec.c:369
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
internal.h
ff_update_cur_dts
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:1970
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1017
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVSEEK_FLAG_BACKWARD
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2495
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:899
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: avcodec.h:4067
AV_WB32
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
av_rescale_rnd
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
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
MAX_CODEC_SECOND_SIZE
#define MAX_CODEC_SECOND_SIZE
Definition: aadec.c:34
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:188
get_second_size
static int get_second_size(char *codec_name)
Definition: aadec.c:57
avpriv_set_pts_info
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:4910
avio_get_str
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:879
size
int size
Definition: twinvq_data.h:11134
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:92
MP3_FRAME_SIZE
#define MP3_FRAME_SIZE
Definition: aadec.c:40
val
const char const char void * val
Definition: avisynth_c.h:863
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
AADemuxContext::current_chapter_size
int64_t current_chapter_size
Definition: aadec.c:51
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
TEA_BLOCK_SIZE
#define TEA_BLOCK_SIZE
Definition: aadec.c:37
AVCodecParameters::block_align
int block_align
Audio only.
Definition: avcodec.h:4074
aa_read_header
static int aa_read_header(AVFormatContext *s)
Definition: aadec.c:72
OFFSET
#define OFFSET(x)
Definition: aadec.c:389
avpriv_new_chapter
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:4608
AV_ROUND_DOWN
@ AV_ROUND_DOWN
Round toward -infinity.
Definition: mathematics.h:82
MAX_TOC_ENTRIES
#define MAX_TOC_ENTRIES
Definition: aadec.c:35
AV_OPT_FLAG_DECODING_PARAM
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:277
uint8_t
uint8_t
Definition: audio_convert.c:194
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:870
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVClass::class_name
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
av_tea_init
void av_tea_init(AVTEA *ctx, const uint8_t key[16], int rounds)
Initialize an AVTEA context.
Definition: tea.c:42
avformat.h
dict.h
AADemuxContext::chapter_idx
int chapter_idx
Definition: aadec.c:48
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
av_tea_alloc
struct AVTEA * av_tea_alloc(void)
Allocate an AVTEA context To free the struct: av_free(ptr)
Definition: tea.c:35
AVFMT_NOGENSEARCH
#define AVFMT_NOGENSEARCH
Format does not allow to fall back on generic search.
Definition: avformat.h:474
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:647
AVSTREAM_PARSE_FULL_RAW
@ AVSTREAM_PARSE_FULL_RAW
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:795
AADemuxContext::seek_offset
int seek_offset
Definition: aadec.c:54
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
ff_aa_demuxer
AVInputFormat ff_aa_demuxer
Definition: aadec.c:405
AADemuxContext::file_key
uint8_t file_key[16]
Definition: aadec.c:50
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1454
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_dict_set
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
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1497
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:565
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3986
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:909
AADemuxContext::content_start
int64_t content_start
Definition: aadec.c:52
CHAPTER_HEADER_SIZE
#define CHAPTER_HEADER_SIZE
Definition: aadec.c:38
AADemuxContext::current_codec_second_size
int current_codec_second_size
Definition: aadec.c:47
AADemuxContext
Definition: aadec.c:42
AVTEA
Definition: tea.c:30
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358