riff: Move guid structs and helper functions into riff
[libav.git] / libavformat / wtv.c
1 /*
2 * Windows Television (WTV) demuxer
3 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/intfloat.h"
31 #include "libavutil/dict.h"
32 #include "avformat.h"
33 #include "internal.h"
34 #include "riff.h"
35 #include "asf.h"
36 #include "mpegts.h"
37
38 /* Macros for formating GUIDs */
39 #define PRI_PRETTY_GUID \
40 "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
41 #define ARG_PRETTY_GUID(g) \
42 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]
43 #define LEN_PRETTY_GUID 34
44
45 /*
46 *
47 * File system routines
48 *
49 */
50
51 #define WTV_SECTOR_BITS 12
52 #define WTV_SECTOR_SIZE (1 << WTV_SECTOR_BITS)
53 #define WTV_BIGSECTOR_BITS 18
54
55 typedef struct {
56 AVIOContext *pb_filesystem; /** file system (AVFormatContext->pb) */
57
58 int sector_bits; /** sector shift bits; used to convert sector number into pb_filesystem offset */
59 uint32_t *sectors; /** file allocation table */
60 int nb_sectors; /** number of sectors */
61
62 int error;
63 int64_t position;
64 int64_t length;
65 } WtvFile;
66
67 /**
68 * @return bytes read, 0 on end of file, or <0 on error
69 */
70 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
71 {
72 WtvFile *wf = opaque;
73 AVIOContext *pb = wf->pb_filesystem;
74 int nread = 0;
75
76 if (wf->error || pb->error)
77 return -1;
78 if (wf->position >= wf->length || pb->eof_reached)
79 return 0;
80
81 buf_size = FFMIN(buf_size, wf->length - wf->position);
82 while(nread < buf_size) {
83 int n;
84 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
85 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
86
87 n = avio_read(pb, buf, read_request);
88 if (n <= 0)
89 break;
90 nread += n;
91 buf += n;
92 wf->position += n;
93 if (n == remaining_in_sector) {
94 int i = wf->position >> wf->sector_bits;
95 if (i >= wf->nb_sectors ||
96 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
97 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
98 wf->error = 1;
99 break;
100 }
101 }
102 }
103 return nread;
104 }
105
106 /**
107 * @return position (or file length)
108 */
109 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
110 {
111 WtvFile *wf = opaque;
112 AVIOContext *pb = wf->pb_filesystem;
113
114 if (whence == AVSEEK_SIZE)
115 return wf->length;
116 else if (whence == SEEK_CUR)
117 offset = wf->position + offset;
118 else if (whence == SEEK_END)
119 offset = wf->length;
120
121 wf->error = offset < 0 || offset >= wf->length ||
122 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
123 + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
124 wf->position = offset;
125 return offset;
126 }
127
128 /**
129 * read non-zero integers (le32) from input stream
130 * @param pb
131 * @param[out] data destination
132 * @param count maximum number of integers to read
133 * @return total number of integers read
134 */
135 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
136 {
137 int i, total = 0;
138 for (i = 0; i < count; i++) {
139 if ((data[total] = avio_rl32(pb)))
140 total++;
141 }
142 return total;
143 }
144
145 /**
146 * Open file
147 * @param first_sector First sector
148 * @param length Length of file (bytes)
149 * @param depth File allocation table depth
150 * @return NULL on error
151 */
152 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
153 {
154 AVIOContext *pb;
155 WtvFile *wf;
156 uint8_t *buffer;
157
158 if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
159 return NULL;
160
161 wf = av_mallocz(sizeof(WtvFile));
162 if (!wf)
163 return NULL;
164
165 if (depth == 0) {
166 wf->sectors = av_malloc(sizeof(uint32_t));
167 if (!wf->sectors) {
168 av_free(wf);
169 return NULL;
170 }
171 wf->sectors[0] = first_sector;
172 wf->nb_sectors = 1;
173 wf->sector_bits = WTV_SECTOR_BITS;
174 } else if (depth == 1) {
175 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
176 if (!wf->sectors) {
177 av_free(wf);
178 return NULL;
179 }
180 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
181 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
182 } else if (depth == 2) {
183 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
184 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
185 int i;
186
187 wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
188 if (!wf->sectors) {
189 av_free(wf);
190 return NULL;
191 }
192 wf->nb_sectors = 0;
193 for (i = 0; i < nb_sectors1; i++) {
194 if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
195 break;
196 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
197 }
198 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
199 } else {
200 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
201 av_free(wf);
202 return NULL;
203 }
204
205 if (!wf->nb_sectors) {
206 av_free(wf->sectors);
207 av_free(wf);
208 return NULL;
209 }
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 (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 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,
236 wtvfile_read_packet, NULL, wtvfile_seek);
237 if (!pb) {
238 av_free(buffer);
239 av_free(wf->sectors);
240 av_free(wf);
241 }
242 return pb;
243 }
244
245 static const ff_asf_guid dir_entry_guid =
246 {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
247
248 /**
249 * Open file using filename
250 * @param[in] buf directory buffer
251 * @param buf_size directory buffer size
252 * @param[in] filename
253 * @param filename_size size of filename
254 * @return NULL on error
255 */
256 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
257 {
258 const uint8_t *buf_end = buf + buf_size;
259
260 while(buf + 48 <= buf_end) {
261 int dir_length, name_size, first_sector, depth;
262 uint64_t file_length;
263 const uint8_t *name;
264 if (ff_guidcmp(buf, dir_entry_guid)) {
265 av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
266 "remaining directory entries ignored\n", FF_ARG_GUID(buf));
267 break;
268 }
269 dir_length = AV_RL16(buf + 16);
270 file_length = AV_RL64(buf + 24);
271 name_size = 2 * AV_RL32(buf + 32);
272 if (buf + 48 + name_size > buf_end) {
273 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
274 break;
275 }
276 first_sector = AV_RL32(buf + 40 + name_size);
277 depth = AV_RL32(buf + 44 + name_size);
278
279 /* compare file name; test optional null terminator */
280 name = buf + 40;
281 if (name_size >= filename_size &&
282 !memcmp(name, filename, filename_size) &&
283 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
284 return wtvfile_open_sector(first_sector, file_length, depth, s);
285
286 buf += dir_length;
287 }
288 return 0;
289 }
290
291 #define wtvfile_open(s, buf, buf_size, filename) \
292 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
293
294 /**
295 * Close file opened with wtvfile_open_sector(), or wtv_open()
296 */
297 static void wtvfile_close(AVIOContext *pb)
298 {
299 WtvFile *wf = pb->opaque;
300 av_free(wf->sectors);
301 av_free(wf);
302 av_free(pb->buffer);
303 av_free(pb);
304 }
305
306 /*
307 *
308 * Main demuxer
309 *
310 */
311
312 typedef struct {
313 int seen_data;
314 } WtvStream;
315
316 typedef struct {
317 AVIOContext *pb; /** timeline file */
318 int64_t epoch;
319 int64_t pts; /** pts for next data chunk */
320 int64_t last_valid_pts; /** latest valid pts, used for interative seeking */
321
322 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
323 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
324 AVIndexEntry *index_entries;
325 int nb_index_entries;
326 unsigned int index_entries_allocated_size;
327 } WtvContext;
328
329 /* WTV GUIDs */
330 static const ff_asf_guid wtv_guid =
331 {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
332 static const ff_asf_guid metadata_guid =
333 {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
334 static const ff_asf_guid timestamp_guid =
335 {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
336 static const ff_asf_guid data_guid =
337 {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
338 static const ff_asf_guid stream_guid =
339 {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
340 static const ff_asf_guid stream2_guid =
341 {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
342 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
343 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
344 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
345 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
346 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
347 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
348 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
349 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
350 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
351 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
352 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
353 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
354 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
355 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
356 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
357 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
358 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
359 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
360
361 /* Windows media GUIDs */
362
363 /* Media types */
364 static const ff_asf_guid mediatype_audio =
365 {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
366 static const ff_asf_guid mediatype_video =
367 {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
368 static const ff_asf_guid mediasubtype_mpeg1payload =
369 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
370 static const ff_asf_guid mediatype_mpeg2_sections =
371 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
372 static const ff_asf_guid mediatype_mpeg2_pes =
373 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
374 static const ff_asf_guid mediatype_mstvcaption =
375 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
376
377 /* Media subtypes */
378 static const ff_asf_guid mediasubtype_cpfilters_processed =
379 {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
380 static const ff_asf_guid mediasubtype_dvb_subtitle =
381 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
382 static const ff_asf_guid mediasubtype_teletext =
383 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
384 static const ff_asf_guid mediasubtype_dtvccdata =
385 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
386 static const ff_asf_guid mediasubtype_mpeg2_sections =
387 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
388
389 /* Formats */
390 static const ff_asf_guid format_cpfilters_processed =
391 {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
392 static const ff_asf_guid format_waveformatex =
393 {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
394 static const ff_asf_guid format_videoinfo2 =
395 {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
396 static const ff_asf_guid format_mpeg2_video =
397 {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
398 static const ff_asf_guid format_none =
399 {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
400
401 static const AVCodecGuid video_guids[] = {
402 {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
403 {AV_CODEC_ID_NONE}
404 };
405
406 static int read_probe(AVProbeData *p)
407 {
408 return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
409 }
410
411 /**
412 * Convert win32 FILETIME to ISO-8601 string
413 */
414 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
415 {
416 time_t t = (value / 10000000LL) - 11644473600LL;
417 struct tm *tm = gmtime(&t);
418 if (tm)
419 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
420 else
421 buf[0] = '\0';
422 }
423
424 /**
425 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
426 */
427 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
428 {
429 time_t t = (value / 10000000LL) - 719162LL*86400LL;
430 struct tm *tm = gmtime(&t);
431 if (tm)
432 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
433 else
434 buf[0] = '\0';
435 }
436
437 /**
438 * Convert OLE DATE to ISO-8601 string
439 */
440 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
441 {
442 time_t t = 631112400LL + 86400*av_int2double(value);
443 struct tm *tm = gmtime(&t);
444 if (tm)
445 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
446 else
447 buf[0] = '\0';
448 }
449
450 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
451 {
452 char mime[1024];
453 char description[1024];
454 unsigned int filesize;
455 AVStream *st;
456 int64_t pos = avio_tell(pb);
457
458 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
459 if (strcmp(mime, "image/jpeg"))
460 goto done;
461
462 avio_r8(pb);
463 avio_get_str16le(pb, INT_MAX, description, sizeof(description));
464 filesize = avio_rl32(pb);
465 if (!filesize)
466 goto done;
467
468 st = avformat_new_stream(s, NULL);
469 if (!st)
470 goto done;
471 av_dict_set(&st->metadata, "title", description, 0);
472 st->codec->codec_id = AV_CODEC_ID_MJPEG;
473 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
474 st->codec->extradata = av_mallocz(filesize);
475 if (!st->codec->extradata)
476 goto done;
477 st->codec->extradata_size = filesize;
478 avio_read(pb, st->codec->extradata, filesize);
479 done:
480 avio_seek(pb, pos + length, SEEK_SET);
481 }
482
483 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
484 {
485 int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
486 char *buf = av_malloc(buf_size);
487 if (!buf)
488 return;
489
490 if (type == 0 && length == 4) {
491 snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
492 } else if (type == 1) {
493 avio_get_str16le(pb, length, buf, buf_size);
494 if (!strlen(buf)) {
495 av_free(buf);
496 return;
497 }
498 } else if (type == 3 && length == 4) {
499 strcpy(buf, avio_rl32(pb) ? "true" : "false");
500 } else if (type == 4 && length == 8) {
501 int64_t num = avio_rl64(pb);
502 if (!strcmp(key, "WM/EncodingTime") ||
503 !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
504 filetime_to_iso8601(buf, buf_size, num);
505 else if (!strcmp(key, "WM/WMRVEncodeTime") ||
506 !strcmp(key, "WM/WMRVEndTime"))
507 crazytime_to_iso8601(buf, buf_size, num);
508 else if (!strcmp(key, "WM/WMRVExpirationDate"))
509 oledate_to_iso8601(buf, buf_size, num);
510 else if (!strcmp(key, "WM/WMRVBitrate"))
511 snprintf(buf, buf_size, "%f", av_int2double(num));
512 else
513 snprintf(buf, buf_size, "%"PRIi64, num);
514 } else if (type == 5 && length == 2) {
515 snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
516 } else if (type == 6 && length == 16) {
517 ff_asf_guid guid;
518 avio_read(pb, guid, 16);
519 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
520 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
521 get_attachment(s, pb, length);
522 av_freep(&buf);
523 return;
524 } else {
525 av_freep(&buf);
526 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
527 avio_skip(pb, length);
528 return;
529 }
530
531 av_dict_set(&s->metadata, key, buf, 0);
532 av_freep(&buf);
533 }
534
535 /**
536 * Parse metadata entries
537 */
538 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
539 {
540 ff_asf_guid guid;
541 int length, type;
542 while(!pb->eof_reached) {
543 char key[1024];
544 ff_get_guid(pb, &guid);
545 type = avio_rl32(pb);
546 length = avio_rl32(pb);
547 if (!length)
548 break;
549 if (ff_guidcmp(&guid, metadata_guid)) {
550 av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
551 "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
552 break;
553 }
554 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
555 get_tag(s, pb, key, type, length);
556 }
557
558 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
559 }
560
561 /**
562 * parse VIDEOINFOHEADER2 structure
563 * @return bytes consumed
564 */
565 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
566 {
567 WtvContext *wtv = s->priv_data;
568 AVIOContext *pb = wtv->pb;
569
570 avio_skip(pb, 72); // picture aspect ratio is unreliable
571 ff_get_bmp_header(pb, st);
572
573 return 72 + 40;
574 }
575
576 /**
577 * Parse MPEG1WAVEFORMATEX extradata structure
578 */
579 static void parse_mpeg1waveformatex(AVStream *st)
580 {
581 /* fwHeadLayer */
582 switch (AV_RL16(st->codec->extradata)) {
583 case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
584 case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
585 case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
586 }
587
588 st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
589
590 /* dwHeadMode */
591 switch (AV_RL16(st->codec->extradata + 6)) {
592 case 1 :
593 case 2 :
594 case 4 : st->codec->channels = 2;
595 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
596 break;
597 case 8 : st->codec->channels = 1;
598 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
599 break;
600 }
601 }
602
603 /**
604 * Initialise stream
605 * @param st Stream to initialise, or NULL to create and initialise new stream
606 * @return NULL on error
607 */
608 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
609 {
610 if (st) {
611 if (st->codec->extradata) {
612 av_freep(&st->codec->extradata);
613 st->codec->extradata_size = 0;
614 }
615 } else {
616 WtvStream *wst = av_mallocz(sizeof(WtvStream));
617 if (!wst)
618 return NULL;
619 st = avformat_new_stream(s, NULL);
620 if (!st)
621 return NULL;
622 st->id = sid;
623 st->priv_data = wst;
624 }
625 st->codec->codec_type = codec_type;
626 st->need_parsing = AVSTREAM_PARSE_FULL;
627 avpriv_set_pts_info(st, 64, 1, 10000000);
628 return st;
629 }
630
631 /**
632 * parse Media Type structure and populate stream
633 * @param st Stream, or NULL to create new stream
634 * @param mediatype Mediatype GUID
635 * @param subtype Subtype GUID
636 * @param formattype Format GUID
637 * @param size Size of format buffer
638 * @return NULL on error
639 */
640 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
641 ff_asf_guid mediatype, ff_asf_guid subtype,
642 ff_asf_guid formattype, int size)
643 {
644 WtvContext *wtv = s->priv_data;
645 AVIOContext *pb = wtv->pb;
646 if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
647 !ff_guidcmp(formattype, format_cpfilters_processed)) {
648 ff_asf_guid actual_subtype;
649 ff_asf_guid actual_formattype;
650
651 if (size < 32) {
652 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
653 avio_skip(pb, size);
654 return NULL;
655 }
656
657 avio_skip(pb, size - 32);
658 ff_get_guid(pb, &actual_subtype);
659 ff_get_guid(pb, &actual_formattype);
660 avio_seek(pb, -size, SEEK_CUR);
661
662 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
663 avio_skip(pb, 32);
664 return st;
665 } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
666 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
667 if (!st)
668 return NULL;
669 if (!ff_guidcmp(formattype, format_waveformatex)) {
670 int ret = ff_get_wav_header(pb, st->codec, size);
671 if (ret < 0)
672 return NULL;
673 } else {
674 if (ff_guidcmp(formattype, format_none))
675 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
676 avio_skip(pb, size);
677 }
678
679 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
680 st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
681 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
682 if (st->codec->extradata && st->codec->extradata_size >= 22)
683 parse_mpeg1waveformatex(st);
684 else
685 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
686 } else {
687 st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
688 if (st->codec->codec_id == AV_CODEC_ID_NONE)
689 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
690 }
691 return st;
692 } else if (!ff_guidcmp(mediatype, mediatype_video)) {
693 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
694 if (!st)
695 return NULL;
696 if (!ff_guidcmp(formattype, format_videoinfo2)) {
697 int consumed = parse_videoinfoheader2(s, st);
698 avio_skip(pb, FFMAX(size - consumed, 0));
699 } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
700 int consumed = parse_videoinfoheader2(s, st);
701 avio_skip(pb, FFMAX(size - consumed, 0));
702 } else {
703 if (ff_guidcmp(formattype, format_none))
704 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
705 avio_skip(pb, size);
706 }
707
708 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
709 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
710 } else {
711 st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
712 }
713 if (st->codec->codec_id == AV_CODEC_ID_NONE)
714 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
715 return st;
716 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
717 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
718 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
719 if (!st)
720 return NULL;
721 if (ff_guidcmp(formattype, format_none))
722 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
723 avio_skip(pb, size);
724 st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
725 return st;
726 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
727 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
728 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
729 if (!st)
730 return NULL;
731 if (ff_guidcmp(formattype, format_none))
732 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
733 avio_skip(pb, size);
734 st->codec->codec_id = AV_CODEC_ID_DVB_TELETEXT;
735 return st;
736 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
737 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
738 if (ff_guidcmp(formattype, format_none))
739 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
740 avio_skip(pb, size);
741 return NULL;
742 }
743
744 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
745 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
746 FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
747 avio_skip(pb, size);
748 return NULL;
749 }
750
751 enum {
752 SEEK_TO_DATA = 0,
753 SEEK_TO_PTS,
754 };
755
756 /**
757 * Parse WTV chunks
758 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
759 * @param seekts timestamp
760 * @param[out] len_ptr Length of data chunk
761 * @return stream index of data chunk, or <0 on error
762 */
763 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
764 {
765 WtvContext *wtv = s->priv_data;
766 AVIOContext *pb = wtv->pb;
767 while (!pb->eof_reached) {
768 ff_asf_guid g;
769 int len, sid, consumed;
770
771 ff_get_guid(pb, &g);
772 len = avio_rl32(pb);
773 if (len < 32)
774 break;
775 sid = avio_rl32(pb) & 0x7FFF;
776 avio_skip(pb, 8);
777 consumed = 32;
778
779 if (!ff_guidcmp(g, stream_guid)) {
780 if (ff_find_stream_index(s, sid) < 0) {
781 ff_asf_guid mediatype, subtype, formattype;
782 int size;
783 avio_skip(pb, 28);
784 ff_get_guid(pb, &mediatype);
785 ff_get_guid(pb, &subtype);
786 avio_skip(pb, 12);
787 ff_get_guid(pb, &formattype);
788 size = avio_rl32(pb);
789 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
790 consumed += 92 + size;
791 }
792 } else if (!ff_guidcmp(g, stream2_guid)) {
793 int stream_index = ff_find_stream_index(s, sid);
794 if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
795 ff_asf_guid mediatype, subtype, formattype;
796 int size;
797 avio_skip(pb, 12);
798 ff_get_guid(pb, &mediatype);
799 ff_get_guid(pb, &subtype);
800 avio_skip(pb, 12);
801 ff_get_guid(pb, &formattype);
802 size = avio_rl32(pb);
803 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
804 consumed += 76 + size;
805 }
806 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
807 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
808 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
809 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
810 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
811 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
812 int stream_index = ff_find_stream_index(s, sid);
813 if (stream_index >= 0) {
814 AVStream *st = s->streams[stream_index];
815 uint8_t buf[258];
816 const uint8_t *pbuf = buf;
817 int buf_size;
818
819 avio_skip(pb, 8);
820 consumed += 8;
821 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
822 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
823 avio_skip(pb, 6);
824 consumed += 6;
825 }
826
827 buf_size = FFMIN(len - consumed, sizeof(buf));
828 avio_read(pb, buf, buf_size);
829 consumed += buf_size;
830 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
831 }
832 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
833 int stream_index = ff_find_stream_index(s, sid);
834 if (stream_index >= 0) {
835 AVStream *st = s->streams[stream_index];
836 int audio_type;
837 avio_skip(pb, 8);
838 audio_type = avio_r8(pb);
839 if (audio_type == 2)
840 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
841 else if (audio_type == 3)
842 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
843 consumed += 9;
844 }
845 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
846 int stream_index = ff_find_stream_index(s, sid);
847 if (stream_index >= 0) {
848 avio_skip(pb, 12);
849 if (avio_rl32(pb))
850 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
851 consumed += 16;
852 }
853 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
854 int stream_index = ff_find_stream_index(s, sid);
855 if (stream_index >= 0) {
856 AVStream *st = s->streams[stream_index];
857 uint8_t language[4];
858 avio_skip(pb, 12);
859 avio_read(pb, language, 3);
860 if (language[0]) {
861 language[3] = 0;
862 av_dict_set(&st->metadata, "language", language, 0);
863 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
864 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
865 }
866 consumed += 15;
867 }
868 } else if (!ff_guidcmp(g, timestamp_guid)) {
869 int stream_index = ff_find_stream_index(s, sid);
870 if (stream_index >= 0) {
871 avio_skip(pb, 8);
872 wtv->pts = avio_rl64(pb);
873 consumed += 16;
874 if (wtv->pts == -1)
875 wtv->pts = AV_NOPTS_VALUE;
876 else {
877 wtv->last_valid_pts = wtv->pts;
878 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
879 wtv->epoch = wtv->pts;
880 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
881 #define WTV_PAD8(x) (((x) + 7) & ~7)
882 avio_skip(pb, WTV_PAD8(len) - consumed);
883 return 0;
884 }
885 }
886 }
887 } else if (!ff_guidcmp(g, data_guid)) {
888 int stream_index = ff_find_stream_index(s, sid);
889 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
890 WtvStream *wst = s->streams[stream_index]->priv_data;
891 wst->seen_data = 1;
892 if (len_ptr) {
893 *len_ptr = len;
894 }
895 return stream_index;
896 }
897 } else if (
898 !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}) ||
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 */ (const ff_asf_guid){0x12,0xF6,0x22,0xB6,0xAD,0x47,0x71,0x46,0xAD,0x6C,0x05,0xA9,0x8E,0x65,0xDE,0x3A}) ||
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, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
914 !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
915 !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
916 //ignore known guids
917 } else
918 av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
919
920 avio_skip(pb, WTV_PAD8(len) - consumed);
921 }
922 return AVERROR_EOF;
923 }
924
925 /* declare utf16le strings */
926 #define _ , 0,
927 static const uint8_t timeline_le16[] =
928 {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
929 static const uint8_t table_0_entries_legacy_attrib_le16[] =
930 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
931 static const uint8_t table_0_entries_time_le16[] =
932 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
933 static const uint8_t timeline_table_0_entries_Events_le16[] =
934 {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};
935 #undef _
936
937 static int read_header(AVFormatContext *s)
938 {
939 WtvContext *wtv = s->priv_data;
940 int root_sector, root_size;
941 uint8_t root[WTV_SECTOR_SIZE];
942 AVIOContext *pb;
943 int64_t timeline_pos;
944 int ret;
945
946 wtv->epoch =
947 wtv->pts =
948 wtv->last_valid_pts = AV_NOPTS_VALUE;
949
950 /* read root directory sector */
951 avio_skip(s->pb, 0x30);
952 root_size = avio_rl32(s->pb);
953 if (root_size > sizeof(root)) {
954 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
955 return AVERROR_INVALIDDATA;
956 }
957 avio_skip(s->pb, 4);
958 root_sector = avio_rl32(s->pb);
959
960 avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
961 root_size = avio_read(s->pb, root, root_size);
962 if (root_size < 0)
963 return AVERROR_INVALIDDATA;
964
965 /* parse chunks up until first data chunk */
966 wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
967 if (!wtv->pb) {
968 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
969 return AVERROR_INVALIDDATA;
970 }
971
972 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
973 if (ret < 0)
974 return ret;
975 avio_seek(wtv->pb, -32, SEEK_CUR);
976
977 timeline_pos = avio_tell(s->pb); // save before opening another file
978
979 /* read metadata */
980 pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
981 if (pb) {
982 parse_legacy_attrib(s, pb);
983 wtvfile_close(pb);
984 }
985
986 /* read seek index */
987 if (s->nb_streams) {
988 AVStream *st = s->streams[0];
989 pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
990 if (pb) {
991 while(1) {
992 uint64_t timestamp = avio_rl64(pb);
993 uint64_t frame_nb = avio_rl64(pb);
994 if (pb->eof_reached)
995 break;
996 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
997 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
998 }
999 wtvfile_close(pb);
1000
1001 if (wtv->nb_index_entries) {
1002 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1003 if (pb) {
1004 int i;
1005 while (1) {
1006 uint64_t frame_nb = avio_rl64(pb);
1007 uint64_t position = avio_rl64(pb);
1008 if (pb->eof_reached)
1009 break;
1010 for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1011 AVIndexEntry *e = wtv->index_entries + i;
1012 if (frame_nb > e->size)
1013 break;
1014 if (position > e->pos)
1015 e->pos = position;
1016 }
1017 }
1018 wtvfile_close(pb);
1019 st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1020 }
1021 }
1022 }
1023 }
1024
1025 avio_seek(s->pb, timeline_pos, SEEK_SET);
1026 return 0;
1027 }
1028
1029 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1030 {
1031 WtvContext *wtv = s->priv_data;
1032 AVIOContext *pb = wtv->pb;
1033 int stream_index, len, ret;
1034
1035 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1036 if (stream_index < 0)
1037 return stream_index;
1038
1039 ret = av_get_packet(pb, pkt, len - 32);
1040 if (ret < 0)
1041 return ret;
1042 pkt->stream_index = stream_index;
1043 pkt->pts = wtv->pts;
1044 avio_skip(pb, WTV_PAD8(len) - len);
1045 return 0;
1046 }
1047
1048 static int read_seek(AVFormatContext *s, int stream_index,
1049 int64_t ts, int flags)
1050 {
1051 WtvContext *wtv = s->priv_data;
1052 AVIOContext *pb = wtv->pb;
1053 AVStream *st = s->streams[0];
1054 int64_t ts_relative;
1055 int i;
1056
1057 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1058 return AVERROR(ENOSYS);
1059
1060 /* timestamp adjustment is required because wtv->pts values are absolute,
1061 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1062 ts_relative = ts;
1063 if (wtv->epoch != AV_NOPTS_VALUE)
1064 ts_relative -= wtv->epoch;
1065
1066 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1067 if (i < 0) {
1068 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1069 avio_seek(pb, 0, SEEK_SET);
1070 else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1071 avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1072 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1073 return AVERROR(ERANGE);
1074 return 0;
1075 }
1076 wtv->pts = wtv->index_entries[i].timestamp;
1077 if (wtv->epoch != AV_NOPTS_VALUE)
1078 wtv->pts += wtv->epoch;
1079 wtv->last_valid_pts = wtv->pts;
1080 avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1081 return 0;
1082 }
1083
1084 static int read_close(AVFormatContext *s)
1085 {
1086 WtvContext *wtv = s->priv_data;
1087 av_free(wtv->index_entries);
1088 wtvfile_close(wtv->pb);
1089 return 0;
1090 }
1091
1092 AVInputFormat ff_wtv_demuxer = {
1093 .name = "wtv",
1094 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1095 .priv_data_size = sizeof(WtvContext),
1096 .read_probe = read_probe,
1097 .read_header = read_header,
1098 .read_packet = read_packet,
1099 .read_seek = read_seek,
1100 .read_close = read_close,
1101 .flags = AVFMT_SHOW_IDS,
1102 };