wtv: fix variable sign in format
[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 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
56
57 typedef struct {
58 AVIOContext *pb_filesystem; /** file system (AVFormatContext->pb) */
59
60 int sector_bits; /** sector shift bits; used to convert sector number into pb_filesystem offset */
61 uint32_t *sectors; /** file allocation table */
62 int nb_sectors; /** number of sectors */
63
64 int error;
65 int64_t position;
66 int64_t length;
67 } WtvFile;
68
69 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
70 {
71 return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
72 }
73
74 /**
75 * @return bytes read, 0 on end of file, or <0 on error
76 */
77 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
78 {
79 WtvFile *wf = opaque;
80 AVIOContext *pb = wf->pb_filesystem;
81 int nread = 0;
82
83 if (wf->error || pb->error)
84 return -1;
85 if (wf->position >= wf->length || pb->eof_reached)
86 return 0;
87
88 buf_size = FFMIN(buf_size, wf->length - wf->position);
89 while(nread < buf_size) {
90 int n;
91 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
92 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
93
94 n = avio_read(pb, buf, read_request);
95 if (n <= 0)
96 break;
97 nread += n;
98 buf += n;
99 wf->position += n;
100 if (n == remaining_in_sector) {
101 int i = wf->position >> wf->sector_bits;
102 if (i >= wf->nb_sectors ||
103 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
104 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
105 wf->error = 1;
106 break;
107 }
108 }
109 }
110 return nread;
111 }
112
113 /**
114 * @return position (or file length)
115 */
116 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
117 {
118 WtvFile *wf = opaque;
119 AVIOContext *pb = wf->pb_filesystem;
120
121 if (whence == AVSEEK_SIZE)
122 return wf->length;
123 else if (whence == SEEK_CUR)
124 offset = wf->position + offset;
125 else if (whence == SEEK_END)
126 offset = wf->length;
127
128 wf->error = offset < 0 || offset >= wf->length ||
129 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
130 offset & ((1 << wf->sector_bits) - 1)) < 0;
131 wf->position = offset;
132 return offset;
133 }
134
135 /**
136 * read non-zero integers (le32) from input stream
137 * @param pb
138 * @param[out] data destination
139 * @param count maximum number of integers to read
140 * @return total number of integers read
141 */
142 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
143 {
144 int i, total = 0;
145 for (i = 0; i < count; i++) {
146 if ((data[total] = avio_rl32(pb)))
147 total++;
148 }
149 return total;
150 }
151
152 /**
153 * Open file
154 * @param first_sector First sector
155 * @param length Length of file (bytes)
156 * @param depth File allocation table depth
157 * @return NULL on error
158 */
159 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
160 {
161 AVIOContext *pb;
162 WtvFile *wf;
163 uint8_t *buffer;
164
165 if (seek_by_sector(s->pb, first_sector, 0) < 0)
166 return NULL;
167
168 wf = av_mallocz(sizeof(WtvFile));
169 if (!wf)
170 return NULL;
171
172 if (depth == 0) {
173 wf->sectors = av_malloc(sizeof(uint32_t));
174 if (!wf->sectors) {
175 av_free(wf);
176 return NULL;
177 }
178 wf->sectors[0] = first_sector;
179 wf->nb_sectors = 1;
180 wf->sector_bits = WTV_SECTOR_BITS;
181 } else if (depth == 1) {
182 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
183 if (!wf->sectors) {
184 av_free(wf);
185 return NULL;
186 }
187 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
188 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
189 } else if (depth == 2) {
190 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
191 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
192 int i;
193
194 wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
195 if (!wf->sectors) {
196 av_free(wf);
197 return NULL;
198 }
199 wf->nb_sectors = 0;
200 for (i = 0; i < nb_sectors1; i++) {
201 if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
202 break;
203 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
204 }
205 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
206 } else {
207 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
208 av_free(wf);
209 return NULL;
210 }
211
212 if (!wf->nb_sectors) {
213 av_free(wf->sectors);
214 av_free(wf);
215 return NULL;
216 }
217
218 /* check length */
219 length &= 0xFFFFFFFFFFFF;
220 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
221 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);
222 length = (int64_t)wf->nb_sectors << wf->sector_bits;
223 }
224 wf->length = length;
225
226 /* seek to initial sector */
227 wf->position = 0;
228 if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
229 av_free(wf->sectors);
230 av_free(wf);
231 return NULL;
232 }
233
234 wf->pb_filesystem = s->pb;
235 buffer = av_malloc(1 << wf->sector_bits);
236 if (!buffer) {
237 av_free(wf->sectors);
238 av_free(wf);
239 return NULL;
240 }
241
242 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
243 wtvfile_read_packet, NULL, wtvfile_seek);
244 if (!pb) {
245 av_free(buffer);
246 av_free(wf->sectors);
247 av_free(wf);
248 }
249 return pb;
250 }
251
252 static const ff_asf_guid dir_entry_guid =
253 {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
254
255 /**
256 * Open file using filename
257 * @param[in] buf directory buffer
258 * @param buf_size directory buffer size
259 * @param[in] filename
260 * @param filename_size size of filename
261 * @return NULL on error
262 */
263 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
264 {
265 const uint8_t *buf_end = buf + buf_size;
266
267 while(buf + 48 <= buf_end) {
268 int dir_length, name_size, first_sector, depth;
269 uint64_t file_length;
270 const uint8_t *name;
271 if (ff_guidcmp(buf, dir_entry_guid)) {
272 av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
273 "remaining directory entries ignored\n", FF_ARG_GUID(buf));
274 break;
275 }
276 dir_length = AV_RL16(buf + 16);
277 file_length = AV_RL64(buf + 24);
278 name_size = 2 * AV_RL32(buf + 32);
279 if (name_size < 0) {
280 av_log(s, AV_LOG_ERROR,
281 "bad filename length, remaining directory entries ignored\n");
282 break;
283 }
284 if (48 + name_size > buf_end - buf) {
285 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
286 break;
287 }
288 first_sector = AV_RL32(buf + 40 + name_size);
289 depth = AV_RL32(buf + 44 + name_size);
290
291 /* compare file name; test optional null terminator */
292 name = buf + 40;
293 if (name_size >= filename_size &&
294 !memcmp(name, filename, filename_size) &&
295 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
296 return wtvfile_open_sector(first_sector, file_length, depth, s);
297
298 buf += dir_length;
299 }
300 return 0;
301 }
302
303 #define wtvfile_open(s, buf, buf_size, filename) \
304 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
305
306 /**
307 * Close file opened with wtvfile_open_sector(), or wtv_open()
308 */
309 static void wtvfile_close(AVIOContext *pb)
310 {
311 WtvFile *wf = pb->opaque;
312 av_free(wf->sectors);
313 av_free(wf);
314 av_free(pb->buffer);
315 av_free(pb);
316 }
317
318 /*
319 *
320 * Main demuxer
321 *
322 */
323
324 typedef struct {
325 int seen_data;
326 } WtvStream;
327
328 typedef struct {
329 AVIOContext *pb; /** timeline file */
330 int64_t epoch;
331 int64_t pts; /** pts for next data chunk */
332 int64_t last_valid_pts; /** latest valid pts, used for interative seeking */
333
334 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
335 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
336 AVIndexEntry *index_entries;
337 int nb_index_entries;
338 unsigned int index_entries_allocated_size;
339 } WtvContext;
340
341 /* WTV GUIDs */
342 static const ff_asf_guid wtv_guid =
343 {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
344 static const ff_asf_guid metadata_guid =
345 {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
346 static const ff_asf_guid timestamp_guid =
347 {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
348 static const ff_asf_guid data_guid =
349 {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
350 static const ff_asf_guid stream_guid =
351 {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
352 static const ff_asf_guid stream2_guid =
353 {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
354 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
355 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
356 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
357 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
358 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
359 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
360 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
361 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
362 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
363 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
364 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
365 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
366 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
367 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
368 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
369 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
370 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
371 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
372
373 /* Windows media GUIDs */
374
375 /* Media types */
376 static const ff_asf_guid mediatype_audio =
377 {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
378 static const ff_asf_guid mediatype_video =
379 {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
380 static const ff_asf_guid mediasubtype_mpeg1payload =
381 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
382 static const ff_asf_guid mediatype_mpeg2_sections =
383 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
384 static const ff_asf_guid mediatype_mpeg2_pes =
385 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
386 static const ff_asf_guid mediatype_mstvcaption =
387 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
388
389 /* Media subtypes */
390 static const ff_asf_guid mediasubtype_cpfilters_processed =
391 {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
392 static const ff_asf_guid mediasubtype_dvb_subtitle =
393 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
394 static const ff_asf_guid mediasubtype_teletext =
395 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
396 static const ff_asf_guid mediasubtype_dtvccdata =
397 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
398 static const ff_asf_guid mediasubtype_mpeg2_sections =
399 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
400
401 /* Formats */
402 static const ff_asf_guid format_cpfilters_processed =
403 {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
404 static const ff_asf_guid format_waveformatex =
405 {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
406 static const ff_asf_guid format_videoinfo2 =
407 {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
408 static const ff_asf_guid format_mpeg2_video =
409 {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
410 static const ff_asf_guid format_none =
411 {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
412
413 static const AVCodecGuid video_guids[] = {
414 {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
415 {AV_CODEC_ID_NONE}
416 };
417
418 static int read_probe(AVProbeData *p)
419 {
420 return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
421 }
422
423 /**
424 * Convert win32 FILETIME to ISO-8601 string
425 */
426 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
427 {
428 time_t t = (value / 10000000LL) - 11644473600LL;
429 struct tm *tm = gmtime(&t);
430 if (tm)
431 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
432 else
433 buf[0] = '\0';
434 }
435
436 /**
437 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
438 */
439 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
440 {
441 time_t t = (value / 10000000LL) - 719162LL*86400LL;
442 struct tm *tm = gmtime(&t);
443 if (tm)
444 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
445 else
446 buf[0] = '\0';
447 }
448
449 /**
450 * Convert OLE DATE to ISO-8601 string
451 */
452 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
453 {
454 time_t t = 631112400LL + 86400*av_int2double(value);
455 struct tm *tm = gmtime(&t);
456 if (tm)
457 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
458 else
459 buf[0] = '\0';
460 }
461
462 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
463 {
464 char mime[1024];
465 char description[1024];
466 unsigned int filesize;
467 AVStream *st;
468 int64_t pos = avio_tell(pb);
469
470 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
471 if (strcmp(mime, "image/jpeg"))
472 goto done;
473
474 avio_r8(pb);
475 avio_get_str16le(pb, INT_MAX, description, sizeof(description));
476 filesize = avio_rl32(pb);
477 if (!filesize)
478 goto done;
479
480 st = avformat_new_stream(s, NULL);
481 if (!st)
482 goto done;
483 av_dict_set(&st->metadata, "title", description, 0);
484 st->codec->codec_id = AV_CODEC_ID_MJPEG;
485 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
486 st->codec->extradata = av_mallocz(filesize);
487 st->id = -1;
488 if (!st->codec->extradata)
489 goto done;
490 st->codec->extradata_size = filesize;
491 avio_read(pb, st->codec->extradata, filesize);
492 done:
493 avio_seek(pb, pos + length, SEEK_SET);
494 }
495
496 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
497 {
498 int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
499 char *buf = av_malloc(buf_size);
500 if (!buf)
501 return;
502
503 if (type == 0 && length == 4) {
504 snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
505 } else if (type == 1) {
506 avio_get_str16le(pb, length, buf, buf_size);
507 if (!strlen(buf)) {
508 av_free(buf);
509 return;
510 }
511 } else if (type == 3 && length == 4) {
512 strcpy(buf, avio_rl32(pb) ? "true" : "false");
513 } else if (type == 4 && length == 8) {
514 int64_t num = avio_rl64(pb);
515 if (!strcmp(key, "WM/EncodingTime") ||
516 !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
517 filetime_to_iso8601(buf, buf_size, num);
518 else if (!strcmp(key, "WM/WMRVEncodeTime") ||
519 !strcmp(key, "WM/WMRVEndTime"))
520 crazytime_to_iso8601(buf, buf_size, num);
521 else if (!strcmp(key, "WM/WMRVExpirationDate"))
522 oledate_to_iso8601(buf, buf_size, num);
523 else if (!strcmp(key, "WM/WMRVBitrate"))
524 snprintf(buf, buf_size, "%f", av_int2double(num));
525 else
526 snprintf(buf, buf_size, "%"PRIi64, num);
527 } else if (type == 5 && length == 2) {
528 snprintf(buf, buf_size, "%u", avio_rl16(pb));
529 } else if (type == 6 && length == 16) {
530 ff_asf_guid guid;
531 avio_read(pb, guid, 16);
532 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
533 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
534 get_attachment(s, pb, length);
535 av_freep(&buf);
536 return;
537 } else {
538 av_freep(&buf);
539 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
540 avio_skip(pb, length);
541 return;
542 }
543
544 av_dict_set(&s->metadata, key, buf, 0);
545 av_freep(&buf);
546 }
547
548 /**
549 * Parse metadata entries
550 */
551 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
552 {
553 ff_asf_guid guid;
554 int length, type;
555 while(!pb->eof_reached) {
556 char key[1024];
557 ff_get_guid(pb, &guid);
558 type = avio_rl32(pb);
559 length = avio_rl32(pb);
560 if (!length)
561 break;
562 if (ff_guidcmp(&guid, metadata_guid)) {
563 av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
564 "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
565 break;
566 }
567 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
568 get_tag(s, pb, key, type, length);
569 }
570
571 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
572 }
573
574 /**
575 * parse VIDEOINFOHEADER2 structure
576 * @return bytes consumed
577 */
578 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
579 {
580 WtvContext *wtv = s->priv_data;
581 AVIOContext *pb = wtv->pb;
582
583 avio_skip(pb, 72); // picture aspect ratio is unreliable
584 ff_get_bmp_header(pb, st);
585
586 return 72 + 40;
587 }
588
589 /**
590 * Parse MPEG1WAVEFORMATEX extradata structure
591 */
592 static void parse_mpeg1waveformatex(AVStream *st)
593 {
594 /* fwHeadLayer */
595 switch (AV_RL16(st->codec->extradata)) {
596 case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
597 case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
598 case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
599 }
600
601 st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
602
603 /* dwHeadMode */
604 switch (AV_RL16(st->codec->extradata + 6)) {
605 case 1 :
606 case 2 :
607 case 4 : st->codec->channels = 2;
608 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
609 break;
610 case 8 : st->codec->channels = 1;
611 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
612 break;
613 }
614 }
615
616 /**
617 * Initialise stream
618 * @param st Stream to initialise, or NULL to create and initialise new stream
619 * @return NULL on error
620 */
621 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
622 {
623 if (st) {
624 if (st->codec->extradata) {
625 av_freep(&st->codec->extradata);
626 st->codec->extradata_size = 0;
627 }
628 } else {
629 WtvStream *wst = av_mallocz(sizeof(WtvStream));
630 if (!wst)
631 return NULL;
632 st = avformat_new_stream(s, NULL);
633 if (!st)
634 return NULL;
635 st->id = sid;
636 st->priv_data = wst;
637 }
638 st->codec->codec_type = codec_type;
639 st->need_parsing = AVSTREAM_PARSE_FULL;
640 avpriv_set_pts_info(st, 64, 1, 10000000);
641 return st;
642 }
643
644 /**
645 * parse Media Type structure and populate stream
646 * @param st Stream, or NULL to create new stream
647 * @param mediatype Mediatype GUID
648 * @param subtype Subtype GUID
649 * @param formattype Format GUID
650 * @param size Size of format buffer
651 * @return NULL on error
652 */
653 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
654 ff_asf_guid mediatype, ff_asf_guid subtype,
655 ff_asf_guid formattype, int size)
656 {
657 WtvContext *wtv = s->priv_data;
658 AVIOContext *pb = wtv->pb;
659 if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
660 !ff_guidcmp(formattype, format_cpfilters_processed)) {
661 ff_asf_guid actual_subtype;
662 ff_asf_guid actual_formattype;
663
664 if (size < 32) {
665 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
666 avio_skip(pb, size);
667 return NULL;
668 }
669
670 avio_skip(pb, size - 32);
671 ff_get_guid(pb, &actual_subtype);
672 ff_get_guid(pb, &actual_formattype);
673 avio_seek(pb, -size, SEEK_CUR);
674
675 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
676 avio_skip(pb, 32);
677 return st;
678 } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
679 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
680 if (!st)
681 return NULL;
682 if (!ff_guidcmp(formattype, format_waveformatex)) {
683 int ret = ff_get_wav_header(pb, st->codec, size);
684 if (ret < 0)
685 return NULL;
686 } else {
687 if (ff_guidcmp(formattype, format_none))
688 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
689 avio_skip(pb, size);
690 }
691
692 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
693 st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
694 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
695 if (st->codec->extradata && st->codec->extradata_size >= 22)
696 parse_mpeg1waveformatex(st);
697 else
698 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
699 } else {
700 st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
701 if (st->codec->codec_id == AV_CODEC_ID_NONE)
702 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
703 }
704 return st;
705 } else if (!ff_guidcmp(mediatype, mediatype_video)) {
706 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
707 if (!st)
708 return NULL;
709 if (!ff_guidcmp(formattype, format_videoinfo2)) {
710 int consumed = parse_videoinfoheader2(s, st);
711 avio_skip(pb, FFMAX(size - consumed, 0));
712 } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
713 int consumed = parse_videoinfoheader2(s, st);
714 avio_skip(pb, FFMAX(size - consumed, 0));
715 } else {
716 if (ff_guidcmp(formattype, format_none))
717 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
718 avio_skip(pb, size);
719 }
720
721 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
722 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
723 } else {
724 st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
725 }
726 if (st->codec->codec_id == AV_CODEC_ID_NONE)
727 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
728 return st;
729 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
730 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
731 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
732 if (!st)
733 return NULL;
734 if (ff_guidcmp(formattype, 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 st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
738 return st;
739 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
740 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
741 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
742 if (!st)
743 return NULL;
744 if (ff_guidcmp(formattype, format_none))
745 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
746 avio_skip(pb, size);
747 st->codec->codec_id = AV_CODEC_ID_DVB_TELETEXT;
748 return st;
749 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
750 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
751 if (ff_guidcmp(formattype, format_none))
752 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
753 avio_skip(pb, size);
754 return NULL;
755 }
756
757 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
758 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
759 FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
760 avio_skip(pb, size);
761 return NULL;
762 }
763
764 enum {
765 SEEK_TO_DATA = 0,
766 SEEK_TO_PTS,
767 };
768
769 /**
770 * Parse WTV chunks
771 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
772 * @param seekts timestamp
773 * @param[out] len_ptr Length of data chunk
774 * @return stream index of data chunk, or <0 on error
775 */
776 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
777 {
778 WtvContext *wtv = s->priv_data;
779 AVIOContext *pb = wtv->pb;
780 while (!pb->eof_reached) {
781 ff_asf_guid g;
782 int len, sid, consumed;
783
784 ff_get_guid(pb, &g);
785 len = avio_rl32(pb);
786 if (len < 32)
787 break;
788 sid = avio_rl32(pb) & 0x7FFF;
789 avio_skip(pb, 8);
790 consumed = 32;
791
792 if (!ff_guidcmp(g, stream_guid)) {
793 if (ff_find_stream_index(s, sid) < 0) {
794 ff_asf_guid mediatype, subtype, formattype;
795 int size;
796 avio_skip(pb, 28);
797 ff_get_guid(pb, &mediatype);
798 ff_get_guid(pb, &subtype);
799 avio_skip(pb, 12);
800 ff_get_guid(pb, &formattype);
801 size = avio_rl32(pb);
802 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
803 consumed += 92 + size;
804 }
805 } else if (!ff_guidcmp(g, stream2_guid)) {
806 int stream_index = ff_find_stream_index(s, sid);
807 if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
808 ff_asf_guid mediatype, subtype, formattype;
809 int size;
810 avio_skip(pb, 12);
811 ff_get_guid(pb, &mediatype);
812 ff_get_guid(pb, &subtype);
813 avio_skip(pb, 12);
814 ff_get_guid(pb, &formattype);
815 size = avio_rl32(pb);
816 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
817 consumed += 76 + size;
818 }
819 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
820 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
821 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
822 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
823 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
824 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
825 int stream_index = ff_find_stream_index(s, sid);
826 if (stream_index >= 0) {
827 AVStream *st = s->streams[stream_index];
828 uint8_t buf[258];
829 const uint8_t *pbuf = buf;
830 int buf_size;
831
832 avio_skip(pb, 8);
833 consumed += 8;
834 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
835 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
836 avio_skip(pb, 6);
837 consumed += 6;
838 }
839
840 buf_size = FFMIN(len - consumed, sizeof(buf));
841 avio_read(pb, buf, buf_size);
842 consumed += buf_size;
843 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
844 }
845 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
846 int stream_index = ff_find_stream_index(s, sid);
847 if (stream_index >= 0) {
848 AVStream *st = s->streams[stream_index];
849 int audio_type;
850 avio_skip(pb, 8);
851 audio_type = avio_r8(pb);
852 if (audio_type == 2)
853 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
854 else if (audio_type == 3)
855 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
856 consumed += 9;
857 }
858 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
859 int stream_index = ff_find_stream_index(s, sid);
860 if (stream_index >= 0) {
861 avio_skip(pb, 12);
862 if (avio_rl32(pb))
863 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
864 consumed += 16;
865 }
866 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
867 int stream_index = ff_find_stream_index(s, sid);
868 if (stream_index >= 0) {
869 AVStream *st = s->streams[stream_index];
870 uint8_t language[4];
871 avio_skip(pb, 12);
872 avio_read(pb, language, 3);
873 if (language[0]) {
874 language[3] = 0;
875 av_dict_set(&st->metadata, "language", language, 0);
876 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
877 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
878 }
879 consumed += 15;
880 }
881 } else if (!ff_guidcmp(g, timestamp_guid)) {
882 int stream_index = ff_find_stream_index(s, sid);
883 if (stream_index >= 0) {
884 avio_skip(pb, 8);
885 wtv->pts = avio_rl64(pb);
886 consumed += 16;
887 if (wtv->pts == -1)
888 wtv->pts = AV_NOPTS_VALUE;
889 else {
890 wtv->last_valid_pts = wtv->pts;
891 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
892 wtv->epoch = wtv->pts;
893 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
894 #define WTV_PAD8(x) (((x) + 7) & ~7)
895 avio_skip(pb, WTV_PAD8(len) - consumed);
896 return 0;
897 }
898 }
899 }
900 } else if (!ff_guidcmp(g, data_guid)) {
901 int stream_index = ff_find_stream_index(s, sid);
902 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
903 WtvStream *wst = s->streams[stream_index]->priv_data;
904 wst->seen_data = 1;
905 if (len_ptr) {
906 *len_ptr = len;
907 }
908 return stream_index;
909 }
910 } else if (
911 !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}) ||
912 !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}) ||
913 !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}) ||
914 !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}) ||
915 !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}) ||
916 !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}) ||
917 !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}) ||
918 !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}) ||
919 !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}) ||
920 !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}) ||
921 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
922 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
923 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
924 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
925 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
926 !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
927 !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
928 !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
929 //ignore known guids
930 } else
931 av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
932
933 avio_skip(pb, WTV_PAD8(len) - consumed);
934 }
935 return AVERROR_EOF;
936 }
937
938 /* declare utf16le strings */
939 #define _ , 0,
940 static const uint8_t timeline_le16[] =
941 {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
942 static const uint8_t table_0_entries_legacy_attrib_le16[] =
943 {'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};
944 static const uint8_t table_0_entries_time_le16[] =
945 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
946 static const uint8_t timeline_table_0_entries_Events_le16[] =
947 {'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};
948 #undef _
949
950 static int read_header(AVFormatContext *s)
951 {
952 WtvContext *wtv = s->priv_data;
953 int root_sector, root_size;
954 uint8_t root[WTV_SECTOR_SIZE];
955 AVIOContext *pb;
956 int64_t timeline_pos;
957 int ret;
958
959 wtv->epoch =
960 wtv->pts =
961 wtv->last_valid_pts = AV_NOPTS_VALUE;
962
963 /* read root directory sector */
964 avio_skip(s->pb, 0x30);
965 root_size = avio_rl32(s->pb);
966 if (root_size > sizeof(root)) {
967 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
968 return AVERROR_INVALIDDATA;
969 }
970 avio_skip(s->pb, 4);
971 root_sector = avio_rl32(s->pb);
972
973 seek_by_sector(s->pb, root_sector, 0);
974 root_size = avio_read(s->pb, root, root_size);
975 if (root_size < 0)
976 return AVERROR_INVALIDDATA;
977
978 /* parse chunks up until first data chunk */
979 wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
980 if (!wtv->pb) {
981 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
982 return AVERROR_INVALIDDATA;
983 }
984
985 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
986 if (ret < 0)
987 return ret;
988 avio_seek(wtv->pb, -32, SEEK_CUR);
989
990 timeline_pos = avio_tell(s->pb); // save before opening another file
991
992 /* read metadata */
993 pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
994 if (pb) {
995 parse_legacy_attrib(s, pb);
996 wtvfile_close(pb);
997 }
998
999 /* read seek index */
1000 if (s->nb_streams) {
1001 AVStream *st = s->streams[0];
1002 pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1003 if (pb) {
1004 while(1) {
1005 uint64_t timestamp = avio_rl64(pb);
1006 uint64_t frame_nb = avio_rl64(pb);
1007 if (pb->eof_reached)
1008 break;
1009 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1010 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1011 }
1012 wtvfile_close(pb);
1013
1014 if (wtv->nb_index_entries) {
1015 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1016 if (pb) {
1017 int i;
1018 while (1) {
1019 uint64_t frame_nb = avio_rl64(pb);
1020 uint64_t position = avio_rl64(pb);
1021 if (pb->eof_reached)
1022 break;
1023 for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1024 AVIndexEntry *e = wtv->index_entries + i;
1025 if (frame_nb > e->size)
1026 break;
1027 if (position > e->pos)
1028 e->pos = position;
1029 }
1030 }
1031 wtvfile_close(pb);
1032 st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1033 }
1034 }
1035 }
1036 }
1037
1038 avio_seek(s->pb, timeline_pos, SEEK_SET);
1039 return 0;
1040 }
1041
1042 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1043 {
1044 WtvContext *wtv = s->priv_data;
1045 AVIOContext *pb = wtv->pb;
1046 int stream_index, len, ret;
1047
1048 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1049 if (stream_index < 0)
1050 return stream_index;
1051
1052 ret = av_get_packet(pb, pkt, len - 32);
1053 if (ret < 0)
1054 return ret;
1055 pkt->stream_index = stream_index;
1056 pkt->pts = wtv->pts;
1057 avio_skip(pb, WTV_PAD8(len) - len);
1058 return 0;
1059 }
1060
1061 static int read_seek(AVFormatContext *s, int stream_index,
1062 int64_t ts, int flags)
1063 {
1064 WtvContext *wtv = s->priv_data;
1065 AVIOContext *pb = wtv->pb;
1066 AVStream *st = s->streams[0];
1067 int64_t ts_relative;
1068 int i;
1069
1070 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1071 return AVERROR(ENOSYS);
1072
1073 /* timestamp adjustment is required because wtv->pts values are absolute,
1074 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1075 ts_relative = ts;
1076 if (wtv->epoch != AV_NOPTS_VALUE)
1077 ts_relative -= wtv->epoch;
1078
1079 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1080 if (i < 0) {
1081 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1082 avio_seek(pb, 0, SEEK_SET);
1083 else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1084 avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1085 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1086 return AVERROR(ERANGE);
1087 return 0;
1088 }
1089 wtv->pts = wtv->index_entries[i].timestamp;
1090 if (wtv->epoch != AV_NOPTS_VALUE)
1091 wtv->pts += wtv->epoch;
1092 wtv->last_valid_pts = wtv->pts;
1093 avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1094 return 0;
1095 }
1096
1097 static int read_close(AVFormatContext *s)
1098 {
1099 WtvContext *wtv = s->priv_data;
1100 av_free(wtv->index_entries);
1101 wtvfile_close(wtv->pb);
1102 return 0;
1103 }
1104
1105 AVInputFormat ff_wtv_demuxer = {
1106 .name = "wtv",
1107 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1108 .priv_data_size = sizeof(WtvContext),
1109 .read_probe = read_probe,
1110 .read_header = read_header,
1111 .read_packet = read_packet,
1112 .read_seek = read_seek,
1113 .read_close = read_close,
1114 .flags = AVFMT_SHOW_IDS,
1115 };