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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 /**
62  * @return bytes read, 0 on end of file, or <0 on error
63  */
64 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
65 {
66  WtvFile *wf = opaque;
67  AVIOContext *pb = wf->pb_filesystem;
68  int nread = 0;
69 
70  if (wf->error || pb->error)
71  return -1;
72  if (wf->position >= wf->length || url_feof(pb))
73  return 0;
74 
75  buf_size = FFMIN(buf_size, wf->length - wf->position);
76  while(nread < buf_size) {
77  int n;
78  int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
79  int read_request = FFMIN(buf_size - nread, remaining_in_sector);
80 
81  n = avio_read(pb, buf, read_request);
82  if (n <= 0)
83  break;
84  nread += n;
85  buf += n;
86  wf->position += n;
87  if (n == remaining_in_sector) {
88  int i = wf->position >> wf->sector_bits;
89  if (i >= wf->nb_sectors ||
90  (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
91  avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
92  wf->error = 1;
93  break;
94  }
95  }
96  }
97  return nread;
98 }
99 
100 /**
101  * @return position (or file length)
102  */
103 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
104 {
105  WtvFile *wf = opaque;
106  AVIOContext *pb = wf->pb_filesystem;
107 
108  if (whence == AVSEEK_SIZE)
109  return wf->length;
110  else if (whence == SEEK_CUR)
111  offset = wf->position + offset;
112  else if (whence == SEEK_END)
113  offset = wf->length;
114 
115  wf->error = offset < 0 || offset >= wf->length ||
116  avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
117  + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
118  wf->position = offset;
119  return offset;
120 }
121 
122 /**
123  * read non-zero integers (le32) from input stream
124  * @param pb
125  * @param[out] data destination
126  * @param count maximum number of integers to read
127  * @return total number of integers read
128  */
129 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
130 {
131  int i, total = 0;
132  for (i = 0; i < count; i++) {
133  if ((data[total] = avio_rl32(pb)))
134  total++;
135  }
136  return total;
137 }
138 
139 /**
140  * Open file
141  * @param first_sector First sector
142  * @param length Length of file (bytes)
143  * @param depth File allocation table depth
144  * @return NULL on error
145  */
146 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
147 {
148  AVIOContext *pb;
149  WtvFile *wf;
150  uint8_t *buffer;
151 
152  if (avio_seek(s->pb, (int64_t)first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
153  return NULL;
154 
155  wf = av_mallocz(sizeof(WtvFile));
156  if (!wf)
157  return NULL;
158 
159  if (depth == 0) {
160  wf->sectors = av_malloc(sizeof(uint32_t));
161  if (!wf->sectors) {
162  av_free(wf);
163  return NULL;
164  }
165  wf->sectors[0] = first_sector;
166  wf->nb_sectors = 1;
167  } else if (depth == 1) {
169  if (!wf->sectors) {
170  av_free(wf);
171  return NULL;
172  }
173  wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
174  } else if (depth == 2) {
175  uint32_t sectors1[WTV_SECTOR_SIZE / 4];
176  int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
177  int i;
178 
179  wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
180  if (!wf->sectors) {
181  av_free(wf);
182  return NULL;
183  }
184  wf->nb_sectors = 0;
185  for (i = 0; i < nb_sectors1; i++) {
186  if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
187  break;
188  wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
189  }
190  } else {
191  av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
192  av_free(wf);
193  return NULL;
194  }
195  wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
196 
197  if (!wf->nb_sectors) {
198  av_free(wf->sectors);
199  av_free(wf);
200  return NULL;
201  }
202 
203  if ((int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > avio_tell(s->pb))
204  av_log(s, AV_LOG_WARNING, "truncated file\n");
205 
206  /* check length */
207  length &= 0xFFFFFFFFFFFF;
208  if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
209  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);
210  length = (int64_t)wf->nb_sectors << wf->sector_bits;
211  }
212  wf->length = length;
213 
214  /* seek to initial sector */
215  wf->position = 0;
216  if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
217  av_free(wf->sectors);
218  av_free(wf);
219  return NULL;
220  }
221 
222  wf->pb_filesystem = s->pb;
223  buffer = av_malloc(1 << wf->sector_bits);
224  if (!buffer) {
225  av_free(wf->sectors);
226  av_free(wf);
227  return NULL;
228  }
229 
230  pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
232  if (!pb) {
233  av_free(buffer);
234  av_free(wf->sectors);
235  av_free(wf);
236  }
237  return pb;
238 }
239 
240 /**
241  * Open file using filename
242  * @param[in] buf directory buffer
243  * @param buf_size directory buffer size
244  * @param[in] filename
245  * @param filename_size size of filename
246  * @return NULL on error
247  */
248 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
249 {
250  const uint8_t *buf_end = buf + buf_size;
251 
252  while(buf + 48 <= buf_end) {
253  int dir_length, name_size, first_sector, depth;
254  uint64_t file_length;
255  const uint8_t *name;
256  if (ff_guidcmp(buf, ff_dir_entry_guid)) {
257  av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
258  "remaining directory entries ignored\n", FF_ARG_GUID(buf));
259  break;
260  }
261  dir_length = AV_RL16(buf + 16);
262  file_length = AV_RL64(buf + 24);
263  name_size = 2 * AV_RL32(buf + 32);
264  if (buf + 48 + (int64_t)name_size > buf_end || name_size<0) {
265  av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
266  break;
267  }
268  first_sector = AV_RL32(buf + 40 + name_size);
269  depth = AV_RL32(buf + 44 + name_size);
270 
271  /* compare file name; test optional null terminator */
272  name = buf + 40;
273  if (name_size >= filename_size &&
274  !memcmp(name, filename, filename_size) &&
275  (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
276  return wtvfile_open_sector(first_sector, file_length, depth, s);
277 
278  buf += dir_length;
279  }
280  return 0;
281 }
282 
283 #define wtvfile_open(s, buf, buf_size, filename) \
284  wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
285 
286 /**
287  * Close file opened with wtvfile_open_sector(), or wtv_open()
288  */
289 static void wtvfile_close(AVIOContext *pb)
290 {
291  WtvFile *wf = pb->opaque;
292  av_free(wf->sectors);
293  av_freep(&pb->opaque);
294  av_freep(&pb->buffer);
295  av_free(pb);
296 }
297 
298 /*
299  *
300  * Main demuxer
301  *
302  */
303 
304 typedef struct {
306 } WtvStream;
307 
308 typedef struct {
309  AVIOContext *pb; /** timeline file */
310  int64_t epoch;
311  int64_t pts; /** pts for next data chunk */
312  int64_t last_valid_pts; /** latest valid pts, used for interative seeking */
313 
314  /* maintain private seek index, as the AVIndexEntry->pos is relative to the
315  start of the 'timeline' file, not the file system (AVFormatContext->pb) */
319 } WtvContext;
320 
321 /* WTV GUIDs */
323  {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
325  {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
327  {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
329  {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
331  {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
333  {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
335  {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
337  {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
339  {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
340 
341 /* Windows media GUIDs */
342 
343 /* Media types */
345  {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
347  {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
349  {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
351  {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
352 
353 /* Media subtypes */
355  {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
357  {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
359  {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
361  {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
362 
363 /* Formats */
365  {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
366 
367 static int read_probe(AVProbeData *p)
368 {
369  return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
370 }
371 
372 /**
373  * Convert win32 FILETIME to ISO-8601 string
374  * @return <0 on error
375  */
376 static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
377 {
378  time_t t = (value / 10000000LL) - 11644473600LL;
379  struct tm *tm = gmtime(&t);
380  if (!tm)
381  return -1;
382  strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
383  return 0;
384 }
385 
386 /**
387  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
388  * @return <0 on error
389  */
390 static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
391 {
392  time_t t = (value / 10000000LL) - 719162LL*86400LL;
393  struct tm *tm = gmtime(&t);
394  if (!tm)
395  return -1;
396  strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
397  return 0;
398 }
399 
400 /**
401  * Convert OLE DATE to ISO-8601 string
402  * @return <0 on error
403  */
404 static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
405 {
406  time_t t = (av_int2double(value) - 25569.0) * 86400;
407  struct tm *result= gmtime(&t);
408  if (!result)
409  return -1;
410  strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", result);
411  return 0;
412 }
413 
414 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
415 {
416  char mime[1024];
417  char description[1024];
418  unsigned int filesize;
419  AVStream *st;
420  int ret;
421  int64_t pos = avio_tell(pb);
422 
423  avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
424  if (strcmp(mime, "image/jpeg"))
425  goto done;
426 
427  avio_r8(pb);
428  avio_get_str16le(pb, INT_MAX, description, sizeof(description));
429  filesize = avio_rl32(pb);
430  if (!filesize)
431  goto done;
432 
433  st = avformat_new_stream(s, NULL);
434  if (!st)
435  goto done;
436  av_dict_set(&st->metadata, "title", description, 0);
439  ret = av_get_packet(pb, &st->attached_pic, filesize);
440  if (ret < 0)
441  goto done;
442  st->attached_pic.stream_index = st->index;
445 done:
446  avio_seek(pb, pos + length, SEEK_SET);
447 }
448 
449 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
450 {
451  int buf_size;
452  char *buf;
453 
454  if (!strcmp(key, "WM/MediaThumbType")) {
455  avio_skip(pb, length);
456  return;
457  }
458 
459  buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
460  buf = av_malloc(buf_size);
461  if (!buf)
462  return;
463 
464  if (type == 0 && length == 4) {
465  snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
466  } else if (type == 1) {
467  avio_get_str16le(pb, length, buf, buf_size);
468  if (!strlen(buf)) {
469  av_free(buf);
470  return;
471  }
472  } else if (type == 3 && length == 4) {
473  strcpy(buf, avio_rl32(pb) ? "true" : "false");
474  } else if (type == 4 && length == 8) {
475  int64_t num = avio_rl64(pb);
476  if (!strcmp(key, "WM/EncodingTime") ||
477  !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
478  if (filetime_to_iso8601(buf, buf_size, num) < 0) {
479  av_free(buf);
480  return;
481  }
482  } else if (!strcmp(key, "WM/WMRVEncodeTime") ||
483  !strcmp(key, "WM/WMRVEndTime")) {
484  if (crazytime_to_iso8601(buf, buf_size, num) < 0) {
485  av_free(buf);
486  return;
487  }
488  } else if (!strcmp(key, "WM/WMRVExpirationDate")) {
489  if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
490  av_free(buf);
491  return;
492  }
493  } else if (!strcmp(key, "WM/WMRVBitrate"))
494  snprintf(buf, buf_size, "%f", av_int2double(num));
495  else
496  snprintf(buf, buf_size, "%"PRIi64, num);
497  } else if (type == 5 && length == 2) {
498  snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
499  } else if (type == 6 && length == 16) {
500  ff_asf_guid guid;
501  avio_read(pb, guid, 16);
502  snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
503  } else if (type == 2 && !strcmp(key, "WM/Picture")) {
504  get_attachment(s, pb, length);
505  av_freep(&buf);
506  return;
507  } else {
508  av_freep(&buf);
509  av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
510  avio_skip(pb, length);
511  return;
512  }
513 
514  av_dict_set(&s->metadata, key, buf, 0);
515  av_freep(&buf);
516 }
517 
518 /**
519  * Parse metadata entries
520  */
522 {
523  ff_asf_guid guid;
524  int length, type;
525  while(!url_feof(pb)) {
526  char key[1024];
527  ff_get_guid(pb, &guid);
528  type = avio_rl32(pb);
529  length = avio_rl32(pb);
530  if (!length)
531  break;
532  if (ff_guidcmp(&guid, ff_metadata_guid)) {
533  av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
534  "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
535  break;
536  }
537  avio_get_str16le(pb, INT_MAX, key, sizeof(key));
538  get_tag(s, pb, key, type, length);
539  }
540 
542 }
543 
544 /**
545  * parse VIDEOINFOHEADER2 structure
546  * @return bytes consumed
547  */
549 {
550  WtvContext *wtv = s->priv_data;
551  AVIOContext *pb = wtv->pb;
552 
553  avio_skip(pb, 72); // picture aspect ratio is unreliable
554  ff_get_bmp_header(pb, st, NULL);
555 
556  return 72 + 40;
557 }
558 
559 /**
560  * Parse MPEG1WAVEFORMATEX extradata structure
561  */
563 {
564  /* fwHeadLayer */
565  switch (AV_RL16(st->codec->extradata)) {
566  case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
567  case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
568  case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
569  }
570 
571  st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
572 
573  /* dwHeadMode */
574  switch (AV_RL16(st->codec->extradata + 6)) {
575  case 1 :
576  case 2 :
577  case 4 : st->codec->channels = 2;
579  break;
580  case 8 : st->codec->channels = 1;
582  break;
583  }
584 }
585 
586 /**
587  * Initialise stream
588  * @param st Stream to initialise, or NULL to create and initialise new stream
589  * @return NULL on error
590  */
591 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
592 {
593  if (st) {
594  if (st->codec->extradata) {
595  av_freep(&st->codec->extradata);
596  st->codec->extradata_size = 0;
597  }
598  } else {
599  WtvStream *wst = av_mallocz(sizeof(WtvStream));
600  if (!wst)
601  return NULL;
602  st = avformat_new_stream(s, NULL);
603  if (!st) {
604  av_free(wst);
605  return NULL;
606  }
607  st->id = sid;
608  st->priv_data = wst;
609  }
610  st->codec->codec_type = codec_type;
612  avpriv_set_pts_info(st, 64, 1, 10000000);
613  return st;
614 }
615 
616 /**
617  * parse Media Type structure and populate stream
618  * @param st Stream, or NULL to create new stream
619  * @param mediatype Mediatype GUID
620  * @param subtype Subtype GUID
621  * @param formattype Format GUID
622  * @param size Size of format buffer
623  * @return NULL on error
624  */
626  ff_asf_guid mediatype, ff_asf_guid subtype,
627  ff_asf_guid formattype, int size)
628 {
629  WtvContext *wtv = s->priv_data;
630  AVIOContext *pb = wtv->pb;
633  ff_asf_guid actual_subtype;
634  ff_asf_guid actual_formattype;
635 
636  if (size < 32) {
637  av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
638  avio_skip(pb, size);
639  return NULL;
640  }
641 
642  avio_skip(pb, size - 32);
643  ff_get_guid(pb, &actual_subtype);
644  ff_get_guid(pb, &actual_formattype);
645  avio_seek(pb, -size, SEEK_CUR);
646 
647  st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
648  avio_skip(pb, 32);
649  return st;
650  } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
651  st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
652  if (!st)
653  return NULL;
654  if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
655  int ret = ff_get_wav_header(pb, st->codec, size);
656  if (ret < 0)
657  return NULL;
658  } else {
659  if (ff_guidcmp(formattype, ff_format_none))
660  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
661  avio_skip(pb, size);
662  }
663 
664  if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
666  } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
667  if (st->codec->extradata && st->codec->extradata_size >= 22)
669  else
670  av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
671  } else {
673  if (st->codec->codec_id == AV_CODEC_ID_NONE)
674  av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
675  }
676  return st;
677  } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
678  st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
679  if (!st)
680  return NULL;
681  if (!ff_guidcmp(formattype, format_videoinfo2)) {
682  int consumed = parse_videoinfoheader2(s, st);
683  avio_skip(pb, FFMAX(size - consumed, 0));
684  } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
685  int consumed = parse_videoinfoheader2(s, st);
686  avio_skip(pb, FFMAX(size - consumed, 0));
687  } else {
688  if (ff_guidcmp(formattype, ff_format_none))
689  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
690  avio_skip(pb, size);
691  }
692 
693  if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
695  } else {
697  }
698  if (st->codec->codec_id == AV_CODEC_ID_NONE)
699  av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
700  return st;
701  } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
703  st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
704  if (!st)
705  return NULL;
706  if (ff_guidcmp(formattype, ff_format_none))
707  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
708  avio_skip(pb, size);
710  return st;
711  } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
713  st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
714  if (!st)
715  return NULL;
716  if (ff_guidcmp(formattype, ff_format_none))
717  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
718  avio_skip(pb, size);
720  return st;
721  } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
723  if (ff_guidcmp(formattype, ff_format_none))
724  av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
725  avio_skip(pb, size);
726  return NULL;
727  }
728 
729  av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
730  ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
731  FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
732  avio_skip(pb, size);
733  return NULL;
734 }
735 
736 enum {
739 };
740 
741 /**
742  * Parse WTV chunks
743  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
744  * @param seekts timestamp
745  * @param[out] len_ptr Length of data chunk
746  * @return stream index of data chunk, or <0 on error
747  */
748 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
749 {
750  WtvContext *wtv = s->priv_data;
751  AVIOContext *pb = wtv->pb;
752  while (!url_feof(pb)) {
753  ff_asf_guid g;
754  int len, sid, consumed;
755 
756  ff_get_guid(pb, &g);
757  len = avio_rl32(pb);
758  if (len < 32)
759  break;
760  sid = avio_rl32(pb) & 0x7FFF;
761  avio_skip(pb, 8);
762  consumed = 32;
763 
765  if (ff_find_stream_index(s, sid) < 0) {
766  ff_asf_guid mediatype, subtype, formattype;
767  int size;
768  avio_skip(pb, 28);
769  ff_get_guid(pb, &mediatype);
770  ff_get_guid(pb, &subtype);
771  avio_skip(pb, 12);
772  ff_get_guid(pb, &formattype);
773  size = avio_rl32(pb);
774  parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
775  consumed += 92 + size;
776  }
777  } else if (!ff_guidcmp(g, ff_stream2_guid)) {
778  int stream_index = ff_find_stream_index(s, sid);
779  if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
780  ff_asf_guid mediatype, subtype, formattype;
781  int size;
782  avio_skip(pb, 12);
783  ff_get_guid(pb, &mediatype);
784  ff_get_guid(pb, &subtype);
785  avio_skip(pb, 12);
786  ff_get_guid(pb, &formattype);
787  size = avio_rl32(pb);
788  parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
789  consumed += 76 + size;
790  }
797  int stream_index = ff_find_stream_index(s, sid);
798  if (stream_index >= 0) {
799  AVStream *st = s->streams[stream_index];
800  uint8_t buf[258];
801  const uint8_t *pbuf = buf;
802  int buf_size;
803 
804  avio_skip(pb, 8);
805  consumed += 8;
808  avio_skip(pb, 6);
809  consumed += 6;
810  }
811 
812  buf_size = FFMIN(len - consumed, sizeof(buf));
813  avio_read(pb, buf, buf_size);
814  consumed += buf_size;
815  ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
816  }
817  } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
818  int stream_index = ff_find_stream_index(s, sid);
819  if (stream_index >= 0) {
820  AVStream *st = s->streams[stream_index];
821  int audio_type;
822  avio_skip(pb, 8);
823  audio_type = avio_r8(pb);
824  if (audio_type == 2)
826  else if (audio_type == 3)
828  consumed += 9;
829  }
831  int stream_index = ff_find_stream_index(s, sid);
832  if (stream_index >= 0) {
833  avio_skip(pb, 12);
834  if (avio_rl32(pb))
835  av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
836  consumed += 16;
837  }
838  } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
839  int stream_index = ff_find_stream_index(s, sid);
840  if (stream_index >= 0) {
841  AVStream *st = s->streams[stream_index];
842  uint8_t language[4];
843  avio_skip(pb, 12);
844  avio_read(pb, language, 3);
845  if (language[0]) {
846  language[3] = 0;
847  av_dict_set(&st->metadata, "language", language, 0);
848  if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
850  }
851  consumed += 15;
852  }
853  } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
854  int stream_index = ff_find_stream_index(s, sid);
855  if (stream_index >= 0) {
856  avio_skip(pb, 8);
857  wtv->pts = avio_rl64(pb);
858  consumed += 16;
859  if (wtv->pts == -1)
860  wtv->pts = AV_NOPTS_VALUE;
861  else {
862  wtv->last_valid_pts = wtv->pts;
863  if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
864  wtv->epoch = wtv->pts;
865  if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
866  avio_skip(pb, WTV_PAD8(len) - consumed);
867  return 0;
868  }
869  }
870  }
871  } else if (!ff_guidcmp(g, ff_data_guid)) {
872  int stream_index = ff_find_stream_index(s, sid);
873  if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
874  WtvStream *wst = s->streams[stream_index]->priv_data;
875  wst->seen_data = 1;
876  if (len_ptr) {
877  *len_ptr = len;
878  }
879  return stream_index;
880  }
881  } 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})) {
882  int stream_index = ff_find_stream_index(s, sid);
883  if (stream_index >= 0)
884  av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
885  } else if (
886  !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}) ||
887  !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}) ||
888  !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}) ||
889  !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
890  !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}) ||
891  !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}) ||
892  !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}) ||
893  !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}) ||
894  !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}) ||
895  !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}) ||
896  !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}) ||
897  !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
898  !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
899  !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
900  !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
901  !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
902  !ff_guidcmp(g, ff_index_guid) ||
903  !ff_guidcmp(g, ff_sync_guid) ||
905  !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
906  //ignore known guids
907  } else
908  av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
909 
910  avio_skip(pb, WTV_PAD8(len) - consumed);
911  }
912  return AVERROR_EOF;
913 }
914 
916 {
917  WtvContext *wtv = s->priv_data;
918  int root_sector, root_size;
919  uint8_t root[WTV_SECTOR_SIZE];
920  AVIOContext *pb;
921  int64_t timeline_pos;
922  int ret;
923 
924  wtv->epoch =
925  wtv->pts =
927 
928  /* read root directory sector */
929  avio_skip(s->pb, 0x30);
930  root_size = avio_rl32(s->pb);
931  if (root_size > sizeof(root)) {
932  av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
933  return AVERROR_INVALIDDATA;
934  }
935  avio_skip(s->pb, 4);
936  root_sector = avio_rl32(s->pb);
937 
938  avio_seek(s->pb, (int64_t)root_sector << WTV_SECTOR_BITS, SEEK_SET);
939  root_size = avio_read(s->pb, root, root_size);
940  if (root_size < 0)
941  return AVERROR_INVALIDDATA;
942 
943  /* parse chunks up until first data chunk */
944  wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
945  if (!wtv->pb) {
946  av_log(s, AV_LOG_ERROR, "timeline data missing\n");
947  return AVERROR_INVALIDDATA;
948  }
949 
950  ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
951  if (ret < 0)
952  return ret;
953  avio_seek(wtv->pb, -32, SEEK_CUR);
954 
955  timeline_pos = avio_tell(s->pb); // save before opening another file
956 
957  /* read metadata */
958  pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
959  if (pb) {
960  parse_legacy_attrib(s, pb);
961  wtvfile_close(pb);
962  }
963 
964  /* read seek index */
965  if (s->nb_streams) {
966  AVStream *st = s->streams[0];
967  pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
968  if (pb) {
969  while(1) {
970  uint64_t timestamp = avio_rl64(pb);
971  uint64_t frame_nb = avio_rl64(pb);
972  if (url_feof(pb))
973  break;
975  0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
976  }
977  wtvfile_close(pb);
978 
979  if (wtv->nb_index_entries) {
980  pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
981  if (pb) {
982  int i;
983  while (1) {
984  uint64_t frame_nb = avio_rl64(pb);
985  uint64_t position = avio_rl64(pb);
986  if (url_feof(pb))
987  break;
988  for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
989  AVIndexEntry *e = wtv->index_entries + i;
990  if (frame_nb > e->size)
991  break;
992  if (position > e->pos)
993  e->pos = position;
994  }
995  }
996  wtvfile_close(pb);
997  st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
998  }
999  }
1000  }
1001  }
1002 
1003  avio_seek(s->pb, timeline_pos, SEEK_SET);
1004  return 0;
1005 }
1006 
1008 {
1009  WtvContext *wtv = s->priv_data;
1010  AVIOContext *pb = wtv->pb;
1011  int stream_index, len, ret;
1012 
1013  stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1014  if (stream_index < 0)
1015  return stream_index;
1016 
1017  ret = av_get_packet(pb, pkt, len - 32);
1018  if (ret < 0)
1019  return ret;
1020  pkt->stream_index = stream_index;
1021  pkt->pts = wtv->pts;
1022  avio_skip(pb, WTV_PAD8(len) - len);
1023  return 0;
1024 }
1025 
1026 static int read_seek(AVFormatContext *s, int stream_index,
1027  int64_t ts, int flags)
1028 {
1029  WtvContext *wtv = s->priv_data;
1030  AVIOContext *pb = wtv->pb;
1031  AVStream *st = s->streams[0];
1032  int64_t ts_relative;
1033  int i;
1034 
1035  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1036  return AVERROR(ENOSYS);
1037 
1038  /* timestamp adjustment is required because wtv->pts values are absolute,
1039  * whereas AVIndexEntry->timestamp values are relative to epoch. */
1040  ts_relative = ts;
1041  if (wtv->epoch != AV_NOPTS_VALUE)
1042  ts_relative -= wtv->epoch;
1043 
1044  i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1045  if (i < 0) {
1046  if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
1047  if (avio_seek(pb, 0, SEEK_SET) < 0)
1048  return -1;
1049  } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
1050  if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
1051  return -1;
1052  }
1053  if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1054  return AVERROR(ERANGE);
1055  return 0;
1056  }
1057  if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
1058  return -1;
1059  wtv->pts = wtv->index_entries[i].timestamp;
1060  if (wtv->epoch != AV_NOPTS_VALUE)
1061  wtv->pts += wtv->epoch;
1062  wtv->last_valid_pts = wtv->pts;
1063  return 0;
1064 }
1065 
1067 {
1068  WtvContext *wtv = s->priv_data;
1069  av_freep(&wtv->index_entries);
1070  wtvfile_close(wtv->pb);
1071  return 0;
1072 }
1073 
1075  .name = "wtv",
1076  .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1077  .priv_data_size = sizeof(WtvContext),
1081  .read_seek = read_seek,
1083  .flags = AVFMT_SHOW_IDS,
1084 };