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wtvdec.c
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1 /*
2  * Windows Television (WTV) demuxer
3  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Windows Television (WTV) demuxer
25  * @author Peter Ross <pross@xvid.org>
26  */
27 
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/intfloat.h"
31 #include "avformat.h"
32 #include "internal.h"
33 #include "wtv.h"
34 #include "mpegts.h"
35 
36 /* Macros for formating GUIDs */
37 #define PRI_PRETTY_GUID \
38  "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
39 #define ARG_PRETTY_GUID(g) \
40  AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
41 #define LEN_PRETTY_GUID 34
42 
43 /*
44  *
45  * File system routines
46  *
47  */
48 
49 typedef struct {
50  AVIOContext *pb_filesystem; /**< file system (AVFormatContext->pb) */
51 
52  int sector_bits; /**< sector shift bits; used to convert sector number into pb_filesystem offset */
53  uint32_t *sectors; /**< file allocation table */
54  int nb_sectors; /**< number of sectors */
55 
56  int error;
57  int64_t position;
58  int64_t length;
59 } WtvFile;
60 
61 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
62 {
63  return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET);
64 }
65 
66 /**
67  * @return bytes read, 0 on end of file, or <0 on error
68  */
69 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
70 {
71  WtvFile *wf = opaque;
72  AVIOContext *pb = wf->pb_filesystem;
73  int nread = 0;
74 
75  if (wf->error || pb->error)
76  return -1;
77  if (wf->position >= wf->length || url_feof(pb))
78  return 0;
79 
80  buf_size = FFMIN(buf_size, wf->length - wf->position);
81  while(nread < buf_size) {
82  int n;
83  int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
84  int read_request = FFMIN(buf_size - nread, remaining_in_sector);
85 
86  n = avio_read(pb, buf, read_request);
87  if (n <= 0)
88  break;
89  nread += n;
90  buf += n;
91  wf->position += n;
92  if (n == remaining_in_sector) {
93  int i = wf->position >> wf->sector_bits;
94  if (i >= wf->nb_sectors ||
95  (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
96  seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
97  wf->error = 1;
98  break;
99  }
100  }
101  }
102  return nread;
103 }
104 
105 /**
106  * @return position (or file length)
107  */
108 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
109 {
110  WtvFile *wf = opaque;
111  AVIOContext *pb = wf->pb_filesystem;
112 
113  if (whence == AVSEEK_SIZE)
114  return wf->length;
115  else if (whence == SEEK_CUR)
116  offset = wf->position + offset;
117  else if (whence == SEEK_END)
118  offset = wf->length;
119 
120  wf->error = offset < 0 || offset >= wf->length ||
121  seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
122  offset & ((1 << wf->sector_bits) - 1)) < 0;
123  wf->position = offset;
124  return offset;
125 }
126 
127 /**
128  * read non-zero integers (le32) from input stream
129  * @param pb
130  * @param[out] data destination
131  * @param count maximum number of integers to read
132  * @return total number of integers read
133  */
134 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
135 {
136  int i, total = 0;
137  for (i = 0; i < count; i++) {
138  if ((data[total] = avio_rl32(pb)))
139  total++;
140  }
141  return total;
142 }
143 
144 /**
145  * Open file
146  * @param first_sector First sector
147  * @param length Length of file (bytes)
148  * @param depth File allocation table depth
149  * @return NULL on error
150  */
151 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
152 {
153  AVIOContext *pb;
154  WtvFile *wf;
155  uint8_t *buffer;
156 
157  if (seek_by_sector(s->pb, first_sector, 0) < 0)
158  return NULL;
159 
160  wf = av_mallocz(sizeof(WtvFile));
161  if (!wf)
162  return NULL;
163 
164  if (depth == 0) {
165  wf->sectors = av_malloc(sizeof(uint32_t));
166  if (!wf->sectors) {
167  av_free(wf);
168  return NULL;
169  }
170  wf->sectors[0] = first_sector;
171  wf->nb_sectors = 1;
172  } else if (depth == 1) {
174  if (!wf->sectors) {
175  av_free(wf);
176  return NULL;
177  }
178  wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
179  } else if (depth == 2) {
180  uint32_t sectors1[WTV_SECTOR_SIZE / 4];
181  int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
182  int i;
183 
184  wf->sectors = av_malloc_array(nb_sectors1, 1 << WTV_SECTOR_BITS);
185  if (!wf->sectors) {
186  av_free(wf);
187  return NULL;
188  }
189  wf->nb_sectors = 0;
190  for (i = 0; i < nb_sectors1; i++) {
191  if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
192  break;
193  wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
194  }
195  } else {
196  av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
197  av_free(wf);
198  return NULL;
199  }
200  wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
201 
202  if (!wf->nb_sectors) {
203  av_free(wf->sectors);
204  av_free(wf);
205  return NULL;
206  }
207 
208  if ((int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > avio_tell(s->pb))
209  av_log(s, AV_LOG_WARNING, "truncated file\n");
210 
211  /* check length */
212  length &= 0xFFFFFFFFFFFF;
213  if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
214  av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
215  length = (int64_t)wf->nb_sectors << wf->sector_bits;
216  }
217  wf->length = length;
218 
219  /* seek to initial sector */
220  wf->position = 0;
221  if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
222  av_free(wf->sectors);
223  av_free(wf);
224  return NULL;
225  }
226 
227  wf->pb_filesystem = s->pb;
228  buffer = av_malloc(1 << wf->sector_bits);
229  if (!buffer) {
230  av_free(wf->sectors);
231  av_free(wf);
232  return NULL;
233  }
234 
235  pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
237  if (!pb) {
238  av_free(buffer);
239  av_free(wf->sectors);
240  av_free(wf);
241  }
242  return pb;
243 }
244 
245 /**
246  * Open file using filename
247  * @param[in] buf directory buffer
248  * @param buf_size directory buffer size
249  * @param[in] filename
250  * @param filename_size size of filename
251  * @return NULL on error
252  */
253 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
254 {
255  const uint8_t *buf_end = buf + buf_size;
256 
257  while(buf + 48 <= buf_end) {
258  int dir_length, name_size, first_sector, depth;
259  uint64_t file_length;
260  const uint8_t *name;
261  if (ff_guidcmp(buf, ff_dir_entry_guid)) {
262  av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
263  "remaining directory entries ignored\n", FF_ARG_GUID(buf));
264  break;
265  }
266  dir_length = AV_RL16(buf + 16);
267  file_length = AV_RL64(buf + 24);
268  name_size = 2 * AV_RL32(buf + 32);
269  if (name_size < 0) {
270  av_log(s, AV_LOG_ERROR,
271  "bad filename length, remaining directory entries ignored\n");
272  break;
273  }
274  if (48 + (int64_t)name_size > buf_end - buf) {
275  av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
276  break;
277  }
278  first_sector = AV_RL32(buf + 40 + name_size);
279  depth = AV_RL32(buf + 44 + name_size);
280 
281  /* compare file name; test optional null terminator */
282  name = buf + 40;
283  if (name_size >= filename_size &&
284  !memcmp(name, filename, filename_size) &&
285  (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
286  return wtvfile_open_sector(first_sector, file_length, depth, s);
287 
288  buf += dir_length;
289  }
290  return 0;
291 }
292 
293 #define wtvfile_open(s, buf, buf_size, filename) \
294  wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
295 
296 /**
297  * Close file opened with wtvfile_open_sector(), or wtv_open()
298  */
299 static void wtvfile_close(AVIOContext *pb)
300 {
301  WtvFile *wf = pb->opaque;
302  av_free(wf->sectors);
303  av_freep(&pb->opaque);
304  av_freep(&pb->buffer);
305  av_free(pb);
306 }
307 
308 /*
309  *
310  * Main demuxer
311  *
312  */
313 
314 typedef struct {
316 } WtvStream;
317 
318 typedef struct {
319  AVIOContext *pb; /**< timeline file */
320  int64_t epoch;
321  int64_t pts; /**< pts for next data chunk */
322  int64_t last_valid_pts; /**< latest valid pts, used for interative seeking */
323 
324  /* maintain private seek index, as the AVIndexEntry->pos is relative to the
325  start of the 'timeline' file, not the file system (AVFormatContext->pb) */
329 } WtvContext;
330 
331 /* WTV GUIDs */
333  {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
335  {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
337  {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
339  {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
341  {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
343  {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
345  {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
347  {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
349  {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
350 
351 /* Windows media GUIDs */
352 
353 /* Media types */
355  {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
357  {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
359  {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
361  {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
362 
363 /* Media subtypes */
365  {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
367  {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
369  {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
371  {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
372 
373 /* Formats */
375  {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
376 
377 static int read_probe(AVProbeData *p)
378 {
379  return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
380 }
381 
382 /**
383  * Convert win32 FILETIME to ISO-8601 string
384  * @return <0 on error
385  */
386 static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
387 {
388  time_t t = (value / 10000000LL) - 11644473600LL;
389  struct tm *tm = gmtime(&t);
390  if (!tm)
391  return -1;
392  strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
393  return 0;
394 }
395 
396 /**
397  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
398  * @return <0 on error
399  */
400 static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
401 {
402  time_t t = (value / 10000000LL) - 719162LL*86400LL;
403  struct tm *tm = gmtime(&t);
404  if (!tm)
405  return -1;
406  strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
407  return 0;
408 }
409 
410 /**
411  * Convert OLE DATE to ISO-8601 string
412  * @return <0 on error
413  */
414 static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
415 {
416  time_t t = (av_int2double(value) - 25569.0) * 86400;
417  struct tm *result= gmtime(&t);
418  if (!result)
419  return -1;
420  strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", result);
421  return 0;
422 }
423 
425 {
426  char mime[1024];
427  char description[1024];
428  unsigned int filesize;
429  AVStream *st;
430  int ret;
431  int64_t pos = avio_tell(pb);
432 
433  avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
434  if (strcmp(mime, "image/jpeg"))
435  goto done;
436 
437  avio_r8(pb);
438  avio_get_str16le(pb, INT_MAX, description, sizeof(description));
439  filesize = avio_rl32(pb);
440  if (!filesize)
441  goto done;
442 
443  st = avformat_new_stream(s, NULL);
444  if (!st)
445  goto done;
446  av_dict_set(&st->metadata, "title", description, 0);
449  st->id = -1;
450  ret = av_get_packet(pb, &st->attached_pic, filesize);
451  if (ret < 0)
452  goto done;
453  st->attached_pic.stream_index = st->index;
456 done:
457  avio_seek(pb, pos + length, SEEK_SET);
458 }
459 
460 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
461 {
462  int buf_size;
463  char *buf;
464 
465  if (!strcmp(key, "WM/MediaThumbType")) {
466  avio_skip(pb, length);
467  return;
468  }
469 
470  buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
471  buf = av_malloc(buf_size);
472  if (!buf)
473  return;
474 
475  if (type == 0 && length == 4) {
476  snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
477  } else if (type == 1) {
478  avio_get_str16le(pb, length, buf, buf_size);
479  if (!strlen(buf)) {
480  av_free(buf);
481  return;
482  }
483  } else if (type == 3 && length == 4) {
484  strcpy(buf, avio_rl32(pb) ? "true" : "false");
485  } else if (type == 4 && length == 8) {
486  int64_t num = avio_rl64(pb);
487  if (!strcmp(key, "WM/EncodingTime") ||
488  !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
489  if (filetime_to_iso8601(buf, buf_size, num) < 0) {
490  av_free(buf);
491  return;
492  }
493  } else if (!strcmp(key, "WM/WMRVEncodeTime") ||
494  !strcmp(key, "WM/WMRVEndTime")) {
495  if (crazytime_to_iso8601(buf, buf_size, num) < 0) {
496  av_free(buf);
497  return;
498  }
499  } else if (!strcmp(key, "WM/WMRVExpirationDate")) {
500  if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
501  av_free(buf);
502  return;
503  }
504  } else if (!strcmp(key, "WM/WMRVBitrate"))
505  snprintf(buf, buf_size, "%f", av_int2double(num));
506  else
507  snprintf(buf, buf_size, "%"PRIi64, num);
508  } else if (type == 5 && length == 2) {
509  snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
510  } else if (type == 6 && length == 16) {
511  ff_asf_guid guid;
512  avio_read(pb, guid, 16);
513  snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
514  } else if (type == 2 && !strcmp(key, "WM/Picture")) {
515  get_attachment(s, pb, length);
516  av_freep(&buf);
517  return;
518  } else {
519  av_freep(&buf);
520  av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
521  avio_skip(pb, length);
522  return;
523  }
524 
525  av_dict_set(&s->metadata, key, buf, 0);
526  av_freep(&buf);
527 }
528 
529 /**
530  * Parse metadata entries
531  */
533 {
534  ff_asf_guid guid;
535  int length, type;
536  while(!url_feof(pb)) {
537  char key[1024];
538  ff_get_guid(pb, &guid);
539  type = avio_rl32(pb);
540  length = avio_rl32(pb);
541  if (!length)
542  break;
543  if (ff_guidcmp(&guid, ff_metadata_guid)) {
544  av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
545  "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
546  break;
547  }
548  avio_get_str16le(pb, INT_MAX, key, sizeof(key));
549  get_tag(s, pb, key, type, length);
550  }
551 
553 }
554 
555 /**
556  * parse VIDEOINFOHEADER2 structure
557  * @return bytes consumed
558  */
560 {
561  WtvContext *wtv = s->priv_data;
562  AVIOContext *pb = wtv->pb;
563 
564  avio_skip(pb, 72); // picture aspect ratio is unreliable
565  ff_get_bmp_header(pb, st, NULL);
566 
567  return 72 + 40;
568 }
569 
570 /**
571  * Parse MPEG1WAVEFORMATEX extradata structure
572  */
574 {
575  /* fwHeadLayer */
576  switch (AV_RL16(st->codec->extradata)) {
577  case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
578  case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
579  case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
580  }
581 
582  st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
583 
584  /* dwHeadMode */
585  switch (AV_RL16(st->codec->extradata + 6)) {
586  case 1 :
587  case 2 :
588  case 4 : st->codec->channels = 2;
590  break;
591  case 8 : st->codec->channels = 1;
593  break;
594  }
595 }
596 
597 /**
598  * Initialise stream
599  * @param st Stream to initialise, or NULL to create and initialise new stream
600  * @return NULL on error
601  */
603 {
604  if (st) {
605  if (st->codec->extradata) {
606  av_freep(&st->codec->extradata);
607  st->codec->extradata_size = 0;
608  }
609  } else {
610  WtvStream *wst = av_mallocz(sizeof(WtvStream));
611  if (!wst)
612  return NULL;
613  st = avformat_new_stream(s, NULL);
614  if (!st) {
615  av_free(wst);
616  return NULL;
617  }
618  st->id = sid;
619  st->priv_data = wst;
620  }
621  st->codec->codec_type = codec_type;
623  avpriv_set_pts_info(st, 64, 1, 10000000);
624  return st;
625 }
626 
627 /**
628  * parse Media Type structure and populate stream
629  * @param st Stream, or NULL to create new stream
630  * @param mediatype Mediatype GUID
631  * @param subtype Subtype GUID
632  * @param formattype Format GUID
633  * @param size Size of format buffer
634  * @return NULL on error
635  */
637  ff_asf_guid mediatype, ff_asf_guid subtype,
638  ff_asf_guid formattype, int size)
639 {
640  WtvContext *wtv = s->priv_data;
641  AVIOContext *pb = wtv->pb;
644  ff_asf_guid actual_subtype;
645  ff_asf_guid actual_formattype;
646 
647  if (size < 32) {
648  av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
649  avio_skip(pb, size);
650  return NULL;
651  }
652 
653  avio_skip(pb, size - 32);
654  ff_get_guid(pb, &actual_subtype);
655  ff_get_guid(pb, &actual_formattype);
656  avio_seek(pb, -size, SEEK_CUR);
657 
658  st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
659  avio_skip(pb, 32);
660  return st;
661  } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
662  st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
663  if (!st)
664  return NULL;
665  if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
666  int ret = ff_get_wav_header(pb, st->codec, size);
667  if (ret < 0)
668  return NULL;
669  } else {
670  if (ff_guidcmp(formattype, ff_format_none))
671  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
672  avio_skip(pb, size);
673  }
674 
675  if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
677  } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
678  if (st->codec->extradata && st->codec->extradata_size >= 22)
680  else
681  av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
682  } else {
684  if (st->codec->codec_id == AV_CODEC_ID_NONE)
685  av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
686  }
687  return st;
688  } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
689  st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
690  if (!st)
691  return NULL;
692  if (!ff_guidcmp(formattype, format_videoinfo2)) {
693  int consumed = parse_videoinfoheader2(s, st);
694  avio_skip(pb, FFMAX(size - consumed, 0));
695  } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
696  int consumed = parse_videoinfoheader2(s, st);
697  avio_skip(pb, FFMAX(size - consumed, 0));
698  } else {
699  if (ff_guidcmp(formattype, ff_format_none))
700  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
701  avio_skip(pb, size);
702  }
703 
704  if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
706  } else {
708  }
709  if (st->codec->codec_id == AV_CODEC_ID_NONE)
710  av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
711  return st;
712  } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
714  st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
715  if (!st)
716  return NULL;
717  if (ff_guidcmp(formattype, ff_format_none))
718  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
719  avio_skip(pb, size);
721  return st;
722  } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
724  st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
725  if (!st)
726  return NULL;
727  if (ff_guidcmp(formattype, ff_format_none))
728  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
729  avio_skip(pb, size);
731  return st;
732  } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
734  if (ff_guidcmp(formattype, ff_format_none))
735  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
736  avio_skip(pb, size);
737  return NULL;
738  }
739 
740  av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
741  ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
742  FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
743  avio_skip(pb, size);
744  return NULL;
745 }
746 
747 enum {
750 };
751 
752 /**
753  * Parse WTV chunks
754  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
755  * @param seekts timestamp
756  * @param[out] len_ptr Length of data chunk
757  * @return stream index of data chunk, or <0 on error
758  */
759 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
760 {
761  WtvContext *wtv = s->priv_data;
762  AVIOContext *pb = wtv->pb;
763  while (!url_feof(pb)) {
764  ff_asf_guid g;
765  int len, sid, consumed;
766 
767  ff_get_guid(pb, &g);
768  len = avio_rl32(pb);
769  if (len < 32)
770  break;
771  sid = avio_rl32(pb) & 0x7FFF;
772  avio_skip(pb, 8);
773  consumed = 32;
774 
776  if (ff_find_stream_index(s, sid) < 0) {
777  ff_asf_guid mediatype, subtype, formattype;
778  int size;
779  avio_skip(pb, 28);
780  ff_get_guid(pb, &mediatype);
781  ff_get_guid(pb, &subtype);
782  avio_skip(pb, 12);
783  ff_get_guid(pb, &formattype);
784  size = avio_rl32(pb);
785  parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
786  consumed += 92 + size;
787  }
788  } else if (!ff_guidcmp(g, ff_stream2_guid)) {
789  int stream_index = ff_find_stream_index(s, sid);
790  if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
791  ff_asf_guid mediatype, subtype, formattype;
792  int size;
793  avio_skip(pb, 12);
794  ff_get_guid(pb, &mediatype);
795  ff_get_guid(pb, &subtype);
796  avio_skip(pb, 12);
797  ff_get_guid(pb, &formattype);
798  size = avio_rl32(pb);
799  parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
800  consumed += 76 + size;
801  }
808  int stream_index = ff_find_stream_index(s, sid);
809  if (stream_index >= 0) {
810  AVStream *st = s->streams[stream_index];
811  uint8_t buf[258];
812  const uint8_t *pbuf = buf;
813  int buf_size;
814 
815  avio_skip(pb, 8);
816  consumed += 8;
819  avio_skip(pb, 6);
820  consumed += 6;
821  }
822 
823  buf_size = FFMIN(len - consumed, sizeof(buf));
824  avio_read(pb, buf, buf_size);
825  consumed += buf_size;
826  ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
827  }
828  } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
829  int stream_index = ff_find_stream_index(s, sid);
830  if (stream_index >= 0) {
831  AVStream *st = s->streams[stream_index];
832  int audio_type;
833  avio_skip(pb, 8);
834  audio_type = avio_r8(pb);
835  if (audio_type == 2)
837  else if (audio_type == 3)
839  consumed += 9;
840  }
842  int stream_index = ff_find_stream_index(s, sid);
843  if (stream_index >= 0) {
844  avio_skip(pb, 12);
845  if (avio_rl32(pb))
846  av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
847  consumed += 16;
848  }
849  } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
850  int stream_index = ff_find_stream_index(s, sid);
851  if (stream_index >= 0) {
852  AVStream *st = s->streams[stream_index];
853  uint8_t language[4];
854  avio_skip(pb, 12);
855  avio_read(pb, language, 3);
856  if (language[0]) {
857  language[3] = 0;
858  av_dict_set(&st->metadata, "language", language, 0);
859  if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
861  }
862  consumed += 15;
863  }
864  } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
865  int stream_index = ff_find_stream_index(s, sid);
866  if (stream_index >= 0) {
867  avio_skip(pb, 8);
868  wtv->pts = avio_rl64(pb);
869  consumed += 16;
870  if (wtv->pts == -1)
871  wtv->pts = AV_NOPTS_VALUE;
872  else {
873  wtv->last_valid_pts = wtv->pts;
874  if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
875  wtv->epoch = wtv->pts;
876  if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
877  avio_skip(pb, WTV_PAD8(len) - consumed);
878  return 0;
879  }
880  }
881  }
882  } else if (!ff_guidcmp(g, ff_data_guid)) {
883  int stream_index = ff_find_stream_index(s, sid);
884  if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
885  WtvStream *wst = s->streams[stream_index]->priv_data;
886  wst->seen_data = 1;
887  if (len_ptr) {
888  *len_ptr = len;
889  }
890  return stream_index;
891  }
892  } else if (!ff_guidcmp(g, /* DSATTRIB_WMDRMProtectionInfo */ (const ff_asf_guid){0x83,0x95,0x74,0x40,0x9D,0x6B,0xEC,0x4E,0xB4,0x3C,0x67,0xA1,0x80,0x1E,0x1A,0x9B})) {
893  int stream_index = ff_find_stream_index(s, sid);
894  if (stream_index >= 0)
895  av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
896  } else if (
897  !ff_guidcmp(g, /* DSATTRIB_CAPTURE_STREAMTIME */ (const ff_asf_guid){0x14,0x56,0x1A,0x0C,0xCD,0x30,0x40,0x4F,0xBC,0xBF,0xD0,0x3E,0x52,0x30,0x62,0x07}) ||
898  !ff_guidcmp(g, /* DSATTRIB_PBDATAG_ATTRIBUTE */ (const ff_asf_guid){0x79,0x66,0xB5,0xE0,0xB9,0x12,0xCC,0x43,0xB7,0xDF,0x57,0x8C,0xAA,0x5A,0x7B,0x63}) ||
899  !ff_guidcmp(g, /* DSATTRIB_PicSampleSeq */ (const ff_asf_guid){0x02,0xAE,0x5B,0x2F,0x8F,0x7B,0x60,0x4F,0x82,0xD6,0xE4,0xEA,0x2F,0x1F,0x4C,0x99}) ||
900  !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
901  !ff_guidcmp(g, /* dvr_ms_vid_frame_rep_data */ (const ff_asf_guid){0xCC,0x32,0x64,0xDD,0x29,0xE2,0xDB,0x40,0x80,0xF6,0xD2,0x63,0x28,0xD2,0x76,0x1F}) ||
902  !ff_guidcmp(g, /* EVENTID_ChannelChangeSpanningEvent */ (const ff_asf_guid){0xE5,0xC5,0x67,0x90,0x5C,0x4C,0x05,0x42,0x86,0xC8,0x7A,0xFE,0x20,0xFE,0x1E,0xFA}) ||
903  !ff_guidcmp(g, /* EVENTID_ChannelInfoSpanningEvent */ (const ff_asf_guid){0x80,0x6D,0xF3,0x41,0x32,0x41,0xC2,0x4C,0xB1,0x21,0x01,0xA4,0x32,0x19,0xD8,0x1B}) ||
904  !ff_guidcmp(g, /* EVENTID_ChannelTypeSpanningEvent */ (const ff_asf_guid){0x51,0x1D,0xAB,0x72,0xD2,0x87,0x9B,0x48,0xBA,0x11,0x0E,0x08,0xDC,0x21,0x02,0x43}) ||
905  !ff_guidcmp(g, /* EVENTID_PIDListSpanningEvent */ (const ff_asf_guid){0x65,0x8F,0xFC,0x47,0xBB,0xE2,0x34,0x46,0x9C,0xEF,0xFD,0xBF,0xE6,0x26,0x1D,0x5C}) ||
906  !ff_guidcmp(g, /* EVENTID_SignalAndServiceStatusSpanningEvent */ (const ff_asf_guid){0xCB,0xC5,0x68,0x80,0x04,0x3C,0x2B,0x49,0xB4,0x7D,0x03,0x08,0x82,0x0D,0xCE,0x51}) ||
907  !ff_guidcmp(g, /* EVENTID_StreamTypeSpanningEvent */ (const ff_asf_guid){0xBC,0x2E,0xAF,0x82,0xA6,0x30,0x64,0x42,0xA8,0x0B,0xAD,0x2E,0x13,0x72,0xAC,0x60}) ||
908  !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
909  !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
910  !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
911  !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
912  !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
913  !ff_guidcmp(g, ff_index_guid) ||
914  !ff_guidcmp(g, ff_sync_guid) ||
916  !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
917  //ignore known guids
918  } else
919  av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
920 
921  avio_skip(pb, WTV_PAD8(len) - consumed);
922  }
923  return AVERROR_EOF;
924 }
925 
927 {
928  WtvContext *wtv = s->priv_data;
929  int root_sector, root_size;
930  uint8_t root[WTV_SECTOR_SIZE];
931  AVIOContext *pb;
932  int64_t timeline_pos;
933  int ret;
934 
935  wtv->epoch =
936  wtv->pts =
938 
939  /* read root directory sector */
940  avio_skip(s->pb, 0x30);
941  root_size = avio_rl32(s->pb);
942  if (root_size > sizeof(root)) {
943  av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
944  return AVERROR_INVALIDDATA;
945  }
946  avio_skip(s->pb, 4);
947  root_sector = avio_rl32(s->pb);
948 
949  seek_by_sector(s->pb, root_sector, 0);
950  root_size = avio_read(s->pb, root, root_size);
951  if (root_size < 0)
952  return AVERROR_INVALIDDATA;
953 
954  /* parse chunks up until first data chunk */
955  wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
956  if (!wtv->pb) {
957  av_log(s, AV_LOG_ERROR, "timeline data missing\n");
958  return AVERROR_INVALIDDATA;
959  }
960 
961  ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
962  if (ret < 0)
963  return ret;
964  avio_seek(wtv->pb, -32, SEEK_CUR);
965 
966  timeline_pos = avio_tell(s->pb); // save before opening another file
967 
968  /* read metadata */
969  pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
970  if (pb) {
971  parse_legacy_attrib(s, pb);
972  wtvfile_close(pb);
973  }
974 
975  /* read seek index */
976  if (s->nb_streams) {
977  AVStream *st = s->streams[0];
978  pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
979  if (pb) {
980  while(1) {
981  uint64_t timestamp = avio_rl64(pb);
982  uint64_t frame_nb = avio_rl64(pb);
983  if (url_feof(pb))
984  break;
986  0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
987  }
988  wtvfile_close(pb);
989 
990  if (wtv->nb_index_entries) {
991  pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
992  if (pb) {
993  int i;
994  while (1) {
995  uint64_t frame_nb = avio_rl64(pb);
996  uint64_t position = avio_rl64(pb);
997  if (url_feof(pb))
998  break;
999  for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1000  AVIndexEntry *e = wtv->index_entries + i;
1001  if (frame_nb > e->size)
1002  break;
1003  if (position > e->pos)
1004  e->pos = position;
1005  }
1006  }
1007  wtvfile_close(pb);
1008  st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1009  }
1010  }
1011  }
1012  }
1013 
1014  avio_seek(s->pb, timeline_pos, SEEK_SET);
1015  return 0;
1016 }
1017 
1019 {
1020  WtvContext *wtv = s->priv_data;
1021  AVIOContext *pb = wtv->pb;
1022  int stream_index, len, ret;
1023 
1024  stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1025  if (stream_index < 0)
1026  return stream_index;
1027 
1028  ret = av_get_packet(pb, pkt, len - 32);
1029  if (ret < 0)
1030  return ret;
1031  pkt->stream_index = stream_index;
1032  pkt->pts = wtv->pts;
1033  avio_skip(pb, WTV_PAD8(len) - len);
1034  return 0;
1035 }
1036 
1037 static int read_seek(AVFormatContext *s, int stream_index,
1038  int64_t ts, int flags)
1039 {
1040  WtvContext *wtv = s->priv_data;
1041  AVIOContext *pb = wtv->pb;
1042  AVStream *st = s->streams[0];
1043  int64_t ts_relative;
1044  int i;
1045 
1046  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1047  return AVERROR(ENOSYS);
1048 
1049  /* timestamp adjustment is required because wtv->pts values are absolute,
1050  * whereas AVIndexEntry->timestamp values are relative to epoch. */
1051  ts_relative = ts;
1052  if (wtv->epoch != AV_NOPTS_VALUE)
1053  ts_relative -= wtv->epoch;
1054 
1055  i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1056  if (i < 0) {
1057  if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
1058  if (avio_seek(pb, 0, SEEK_SET) < 0)
1059  return -1;
1060  } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
1061  if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
1062  return -1;
1063  }
1064  if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1065  return AVERROR(ERANGE);
1066  return 0;
1067  }
1068  if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
1069  return -1;
1070  wtv->pts = wtv->index_entries[i].timestamp;
1071  if (wtv->epoch != AV_NOPTS_VALUE)
1072  wtv->pts += wtv->epoch;
1073  wtv->last_valid_pts = wtv->pts;
1074  return 0;
1075 }
1076 
1078 {
1079  WtvContext *wtv = s->priv_data;
1080  av_freep(&wtv->index_entries);
1081  wtvfile_close(wtv->pb);
1082  return 0;
1083 }
1084 
1086  .name = "wtv",
1087  .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1088  .priv_data_size = sizeof(WtvContext),
1092  .read_seek = read_seek,
1094  .flags = AVFMT_SHOW_IDS,
1095 };