apetag: account for header size if present when returning the start position
[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 <inttypes.h>
29
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/intfloat.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/time_internal.h"
35 #include "avformat.h"
36 #include "internal.h"
37 #include "riff.h"
38 #include "asf.h"
39 #include "mpegts.h"
40
41 /* Macros for formatting GUIDs */
42 #define PRI_PRETTY_GUID \
43 "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
44 #define ARG_PRETTY_GUID(g) \
45 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]
46 #define LEN_PRETTY_GUID 34
47
48 /*
49 * File system routines
50 */
51
52 #define WTV_SECTOR_BITS 12
53 #define WTV_SECTOR_SIZE (1 << WTV_SECTOR_BITS)
54 #define WTV_BIGSECTOR_BITS 18
55
56 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
57
58 typedef struct WtvFile {
59 AVIOContext *pb_filesystem; /** file system (AVFormatContext->pb) */
60
61 int sector_bits; /** sector shift bits; used to convert sector number into pb_filesystem offset */
62 uint32_t *sectors; /** file allocation table */
63 int nb_sectors; /** number of sectors */
64
65 int error;
66 int64_t position;
67 int64_t length;
68 } WtvFile;
69
70 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
71 {
72 return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
73 }
74
75 /**
76 * @return bytes read, 0 on end of file, or <0 on error
77 */
78 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
79 {
80 WtvFile *wf = opaque;
81 AVIOContext *pb = wf->pb_filesystem;
82 int nread = 0;
83
84 if (wf->error || pb->error)
85 return -1;
86 if (wf->position >= wf->length || pb->eof_reached)
87 return 0;
88
89 buf_size = FFMIN(buf_size, wf->length - wf->position);
90 while(nread < buf_size) {
91 int n;
92 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
93 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
94
95 n = avio_read(pb, buf, read_request);
96 if (n <= 0)
97 break;
98 nread += n;
99 buf += n;
100 wf->position += n;
101 if (n == remaining_in_sector) {
102 int i = wf->position >> wf->sector_bits;
103 if (i >= wf->nb_sectors ||
104 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
105 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
106 wf->error = 1;
107 break;
108 }
109 }
110 }
111 return nread;
112 }
113
114 /**
115 * @return position (or file length)
116 */
117 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
118 {
119 WtvFile *wf = opaque;
120 AVIOContext *pb = wf->pb_filesystem;
121
122 if (whence == AVSEEK_SIZE)
123 return wf->length;
124 else if (whence == SEEK_CUR)
125 offset = wf->position + offset;
126 else if (whence == SEEK_END)
127 offset = wf->length;
128
129 wf->error = offset < 0 || offset >= wf->length ||
130 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
131 offset & ((1 << wf->sector_bits) - 1)) < 0;
132 wf->position = offset;
133 return offset;
134 }
135
136 /**
137 * read non-zero integers (le32) from input stream
138 * @param pb
139 * @param[out] data destination
140 * @param count maximum number of integers to read
141 * @return total number of integers read
142 */
143 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
144 {
145 int i, total = 0;
146 for (i = 0; i < count; i++) {
147 if ((data[total] = avio_rl32(pb)))
148 total++;
149 }
150 return total;
151 }
152
153 /**
154 * Open file
155 * @param first_sector First sector
156 * @param length Length of file (bytes)
157 * @param depth File allocation table depth
158 * @return NULL on error
159 */
160 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
161 {
162 AVIOContext *pb;
163 WtvFile *wf;
164 uint8_t *buffer;
165
166 if (seek_by_sector(s->pb, first_sector, 0) < 0)
167 return NULL;
168
169 wf = av_mallocz(sizeof(WtvFile));
170 if (!wf)
171 return NULL;
172
173 if (depth == 0) {
174 wf->sectors = av_malloc(sizeof(uint32_t));
175 if (!wf->sectors) {
176 av_free(wf);
177 return NULL;
178 }
179 wf->sectors[0] = first_sector;
180 wf->nb_sectors = 1;
181 wf->sector_bits = WTV_SECTOR_BITS;
182 } else if (depth == 1) {
183 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
184 if (!wf->sectors) {
185 av_free(wf);
186 return NULL;
187 }
188 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
189 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
190 } else if (depth == 2) {
191 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
192 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
193 int i;
194
195 wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
196 if (!wf->sectors) {
197 av_free(wf);
198 return NULL;
199 }
200 wf->nb_sectors = 0;
201 for (i = 0; i < nb_sectors1; i++) {
202 if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
203 break;
204 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
205 }
206 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
207 } else {
208 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
209 av_free(wf);
210 return NULL;
211 }
212
213 if (!wf->nb_sectors) {
214 av_free(wf->sectors);
215 av_free(wf);
216 return NULL;
217 }
218
219 /* check length */
220 length &= 0xFFFFFFFFFFFF;
221 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
222 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);
223 length = (int64_t)wf->nb_sectors << wf->sector_bits;
224 }
225 wf->length = length;
226
227 /* seek to initial sector */
228 wf->position = 0;
229 if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
230 av_free(wf->sectors);
231 av_free(wf);
232 return NULL;
233 }
234
235 wf->pb_filesystem = s->pb;
236 buffer = av_malloc(1 << wf->sector_bits);
237 if (!buffer) {
238 av_free(wf->sectors);
239 av_free(wf);
240 return NULL;
241 }
242
243 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
244 wtvfile_read_packet, NULL, wtvfile_seek);
245 if (!pb) {
246 av_free(buffer);
247 av_free(wf->sectors);
248 av_free(wf);
249 }
250 return pb;
251 }
252
253 static const ff_asf_guid dir_entry_guid =
254 {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
255
256 /**
257 * Open file using filename
258 * @param[in] buf directory buffer
259 * @param buf_size directory buffer size
260 * @param[in] filename
261 * @param filename_size size of filename
262 * @return NULL on error
263 */
264 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
265 {
266 const uint8_t *buf_end = buf + buf_size;
267
268 while(buf + 48 <= buf_end) {
269 int dir_length, name_size, first_sector, depth;
270 uint64_t file_length;
271 const uint8_t *name;
272 if (ff_guidcmp(buf, dir_entry_guid)) {
273 av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
274 "remaining directory entries ignored\n", FF_ARG_GUID(buf));
275 break;
276 }
277 dir_length = AV_RL16(buf + 16);
278 file_length = AV_RL64(buf + 24);
279 name_size = 2 * AV_RL32(buf + 32);
280 if (name_size < 0) {
281 av_log(s, AV_LOG_ERROR,
282 "bad filename length, remaining directory entries ignored\n");
283 break;
284 }
285 if (48 + name_size > buf_end - buf) {
286 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
287 break;
288 }
289 first_sector = AV_RL32(buf + 40 + name_size);
290 depth = AV_RL32(buf + 44 + name_size);
291
292 /* compare file name; test optional null terminator */
293 name = buf + 40;
294 if (name_size >= filename_size &&
295 !memcmp(name, filename, filename_size) &&
296 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
297 return wtvfile_open_sector(first_sector, file_length, depth, s);
298
299 buf += dir_length;
300 }
301 return 0;
302 }
303
304 #define wtvfile_open(s, buf, buf_size, filename) \
305 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
306
307 /**
308 * Close file opened with wtvfile_open_sector(), or wtv_open()
309 */
310 static void wtvfile_close(AVIOContext *pb)
311 {
312 WtvFile *wf = pb->opaque;
313 av_free(wf->sectors);
314 av_free(wf);
315 av_free(pb->buffer);
316 avio_context_free(&pb);
317 }
318
319 /*
320 * Main demuxer
321 */
322
323 typedef struct WtvStream {
324 int seen_data;
325 } WtvStream;
326
327 typedef struct WtvContext {
328 AVIOContext *pb; /** timeline file */
329 int64_t epoch;
330 int64_t pts; /** pts for next data chunk */
331 int64_t last_valid_pts; /** latest valid pts, used for interactive seeking */
332
333 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
334 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
335 AVIndexEntry *index_entries;
336 int nb_index_entries;
337 unsigned int index_entries_allocated_size;
338 } WtvContext;
339
340 /* WTV GUIDs */
341 static const ff_asf_guid wtv_guid =
342 {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
343 static const ff_asf_guid metadata_guid =
344 {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
345 static const ff_asf_guid timestamp_guid =
346 {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
347 static const ff_asf_guid data_guid =
348 {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
349 static const ff_asf_guid stream_guid =
350 {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
351 static const ff_asf_guid stream2_guid =
352 {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
353 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
354 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
355 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
356 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
357 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
358 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
359 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
360 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
361 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
362 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
363 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
364 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
365 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
366 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
367 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
368 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
369 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
370 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
371
372 /* Windows media GUIDs */
373
374 /* Media types */
375 static const ff_asf_guid mediatype_audio =
376 {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
377 static const ff_asf_guid mediatype_video =
378 {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
379 static const ff_asf_guid mediasubtype_mpeg1payload =
380 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
381 static const ff_asf_guid mediatype_mpeg2_sections =
382 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
383 static const ff_asf_guid mediatype_mpeg2_pes =
384 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
385 static const ff_asf_guid mediatype_mstvcaption =
386 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
387
388 /* Media subtypes */
389 static const ff_asf_guid mediasubtype_cpfilters_processed =
390 {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
391 static const ff_asf_guid mediasubtype_dvb_subtitle =
392 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
393 static const ff_asf_guid mediasubtype_teletext =
394 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
395 static const ff_asf_guid mediasubtype_dtvccdata =
396 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
397 static const ff_asf_guid mediasubtype_mpeg2_sections =
398 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
399
400 /* Formats */
401 static const ff_asf_guid format_cpfilters_processed =
402 {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
403 static const ff_asf_guid format_waveformatex =
404 {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
405 static const ff_asf_guid format_videoinfo2 =
406 {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
407 static const ff_asf_guid format_mpeg2_video =
408 {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
409 static const ff_asf_guid format_none =
410 {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
411
412 static const AVCodecGuid video_guids[] = {
413 {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
414 {AV_CODEC_ID_NONE}
415 };
416
417 static int read_probe(AVProbeData *p)
418 {
419 return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
420 }
421
422 /**
423 * Convert win32 FILETIME to ISO-8601 string
424 */
425 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
426 {
427 time_t t = (value / 10000000LL) - 11644473600LL;
428 struct tm tmbuf;
429 struct tm *tm = gmtime_r(&t, &tmbuf);
430 if (tm) {
431 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
432 buf[0] = '\0';
433 } else
434 buf[0] = '\0';
435 }
436
437 /**
438 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
439 */
440 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
441 {
442 time_t t = (value / 10000000LL) - 719162LL*86400LL;
443 struct tm tmbuf;
444 struct tm *tm = gmtime_r(&t, &tmbuf);
445 if (tm) {
446 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
447 buf[0] = '\0';
448 } else
449 buf[0] = '\0';
450 }
451
452 /**
453 * Convert OLE DATE to ISO-8601 string
454 */
455 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
456 {
457 time_t t = 631112400LL + 86400*av_int2double(value);
458 struct tm tmbuf;
459 struct tm *tm = gmtime_r(&t, &tmbuf);
460 if (tm) {
461 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
462 buf[0] = '\0';
463 } else
464 buf[0] = '\0';
465 }
466
467 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
468 {
469 char mime[1024];
470 char description[1024];
471 unsigned int filesize;
472 AVStream *st;
473 int64_t pos = avio_tell(pb);
474
475 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
476 if (strcmp(mime, "image/jpeg"))
477 goto done;
478
479 avio_r8(pb);
480 avio_get_str16le(pb, INT_MAX, description, sizeof(description));
481 filesize = avio_rl32(pb);
482 if (!filesize)
483 goto done;
484
485 st = avformat_new_stream(s, NULL);
486 if (!st)
487 goto done;
488 av_dict_set(&st->metadata, "title", description, 0);
489 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
490 st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
491 st->codecpar->extradata = av_mallocz(filesize);
492 st->id = -1;
493 if (!st->codecpar->extradata)
494 goto done;
495 st->codecpar->extradata_size = filesize;
496 avio_read(pb, st->codecpar->extradata, filesize);
497 done:
498 avio_seek(pb, pos + length, SEEK_SET);
499 }
500
501 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
502 {
503 int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
504 char *buf = av_malloc(buf_size);
505 if (!buf)
506 return;
507
508 if (type == 0 && length == 4) {
509 snprintf(buf, buf_size, "%u", avio_rl32(pb));
510 } else if (type == 1) {
511 avio_get_str16le(pb, length, buf, buf_size);
512 if (!strlen(buf)) {
513 av_free(buf);
514 return;
515 }
516 } else if (type == 3 && length == 4) {
517 strcpy(buf, avio_rl32(pb) ? "true" : "false");
518 } else if (type == 4 && length == 8) {
519 int64_t num = avio_rl64(pb);
520 if (!strcmp(key, "WM/EncodingTime") ||
521 !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
522 filetime_to_iso8601(buf, buf_size, num);
523 else if (!strcmp(key, "WM/WMRVEncodeTime") ||
524 !strcmp(key, "WM/WMRVEndTime"))
525 crazytime_to_iso8601(buf, buf_size, num);
526 else if (!strcmp(key, "WM/WMRVExpirationDate"))
527 oledate_to_iso8601(buf, buf_size, num);
528 else if (!strcmp(key, "WM/WMRVBitrate"))
529 snprintf(buf, buf_size, "%f", av_int2double(num));
530 else
531 snprintf(buf, buf_size, "%"PRIi64, num);
532 } else if (type == 5 && length == 2) {
533 snprintf(buf, buf_size, "%u", avio_rl16(pb));
534 } else if (type == 6 && length == 16) {
535 ff_asf_guid guid;
536 avio_read(pb, guid, 16);
537 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
538 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
539 get_attachment(s, pb, length);
540 av_freep(&buf);
541 return;
542 } else {
543 av_freep(&buf);
544 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
545 avio_skip(pb, length);
546 return;
547 }
548
549 av_dict_set(&s->metadata, key, buf, 0);
550 av_freep(&buf);
551 }
552
553 /**
554 * Parse metadata entries
555 */
556 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
557 {
558 ff_asf_guid guid;
559 int length, type;
560 while(!pb->eof_reached) {
561 char key[1024];
562 ff_get_guid(pb, &guid);
563 type = avio_rl32(pb);
564 length = avio_rl32(pb);
565 if (!length)
566 break;
567 if (ff_guidcmp(&guid, metadata_guid)) {
568 av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
569 "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
570 break;
571 }
572 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
573 get_tag(s, pb, key, type, length);
574 }
575
576 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
577 }
578
579 /**
580 * parse VIDEOINFOHEADER2 structure
581 * @return bytes consumed
582 */
583 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
584 {
585 WtvContext *wtv = s->priv_data;
586 AVIOContext *pb = wtv->pb;
587
588 avio_skip(pb, 72); // picture aspect ratio is unreliable
589 ff_get_bmp_header(pb, st, NULL);
590
591 return 72 + 40;
592 }
593
594 /**
595 * Parse MPEG1WAVEFORMATEX extradata structure
596 */
597 static void parse_mpeg1waveformatex(AVStream *st)
598 {
599 /* fwHeadLayer */
600 switch (AV_RL16(st->codecpar->extradata)) {
601 case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break;
602 case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
603 case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
604 }
605
606 st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */
607
608 /* dwHeadMode */
609 switch (AV_RL16(st->codecpar->extradata + 6)) {
610 case 1 :
611 case 2 :
612 case 4 : st->codecpar->channels = 2;
613 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
614 break;
615 case 8 : st->codecpar->channels = 1;
616 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
617 break;
618 }
619 }
620
621 /**
622 * Initialise stream
623 * @param st Stream to initialise, or NULL to create and initialise new stream
624 * @return NULL on error
625 */
626 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
627 {
628 if (st) {
629 if (st->codecpar->extradata) {
630 av_freep(&st->codecpar->extradata);
631 st->codecpar->extradata_size = 0;
632 }
633 } else {
634 WtvStream *wst = av_mallocz(sizeof(WtvStream));
635 if (!wst)
636 return NULL;
637 st = avformat_new_stream(s, NULL);
638 if (!st) {
639 av_free(wst);
640 return NULL;
641 }
642 st->id = sid;
643 st->priv_data = wst;
644 }
645 st->codecpar->codec_type = codec_type;
646 st->need_parsing = AVSTREAM_PARSE_FULL;
647 avpriv_set_pts_info(st, 64, 1, 10000000);
648 return st;
649 }
650
651 /**
652 * parse Media Type structure and populate stream
653 * @param st Stream, or NULL to create new stream
654 * @param mediatype Mediatype GUID
655 * @param subtype Subtype GUID
656 * @param formattype Format GUID
657 * @param size Size of format buffer
658 * @return NULL on error
659 */
660 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
661 ff_asf_guid mediatype, ff_asf_guid subtype,
662 ff_asf_guid formattype, int size)
663 {
664 WtvContext *wtv = s->priv_data;
665 AVIOContext *pb = wtv->pb;
666 if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
667 !ff_guidcmp(formattype, format_cpfilters_processed)) {
668 ff_asf_guid actual_subtype;
669 ff_asf_guid actual_formattype;
670
671 if (size < 32) {
672 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
673 avio_skip(pb, size);
674 return NULL;
675 }
676
677 avio_skip(pb, size - 32);
678 ff_get_guid(pb, &actual_subtype);
679 ff_get_guid(pb, &actual_formattype);
680 avio_seek(pb, -size, SEEK_CUR);
681
682 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
683 avio_skip(pb, 32);
684 return st;
685 } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
686 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
687 if (!st)
688 return NULL;
689 if (!ff_guidcmp(formattype, format_waveformatex)) {
690 int ret = ff_get_wav_header(s, pb, st->codecpar, size);
691 if (ret < 0)
692 return NULL;
693 } else {
694 if (ff_guidcmp(formattype, format_none))
695 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
696 avio_skip(pb, size);
697 }
698
699 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
700 st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample);
701 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
702 if (st->codecpar->extradata && st->codecpar->extradata_size >= 22)
703 parse_mpeg1waveformatex(st);
704 else
705 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
706 } else {
707 st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
708 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
709 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
710 }
711 return st;
712 } else if (!ff_guidcmp(mediatype, mediatype_video)) {
713 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
714 if (!st)
715 return NULL;
716 if (!ff_guidcmp(formattype, format_videoinfo2)) {
717 int consumed = parse_videoinfoheader2(s, st);
718 avio_skip(pb, FFMAX(size - consumed, 0));
719 } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
720 int consumed = parse_videoinfoheader2(s, st);
721 avio_skip(pb, FFMAX(size - consumed, 0));
722 } else {
723 if (ff_guidcmp(formattype, 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 }
727
728 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
729 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
730 } else {
731 st->codecpar->codec_id = ff_codec_guid_get_id(video_guids, subtype);
732 }
733 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
734 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
735 return st;
736 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
737 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
738 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
739 if (!st)
740 return NULL;
741 if (ff_guidcmp(formattype, format_none))
742 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
743 avio_skip(pb, size);
744 st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
745 return st;
746 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
747 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
748 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
749 if (!st)
750 return NULL;
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 st->codecpar->codec_id = AV_CODEC_ID_DVB_TELETEXT;
755 return st;
756 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
757 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
758 if (ff_guidcmp(formattype, format_none))
759 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
760 avio_skip(pb, size);
761 return NULL;
762 }
763
764 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
765 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
766 FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
767 avio_skip(pb, size);
768 return NULL;
769 }
770
771 enum {
772 SEEK_TO_DATA = 0,
773 SEEK_TO_PTS,
774 };
775
776 /**
777 * Parse WTV chunks
778 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
779 * @param seekts timestamp
780 * @param[out] len_ptr Length of data chunk
781 * @return stream index of data chunk, or <0 on error
782 */
783 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
784 {
785 WtvContext *wtv = s->priv_data;
786 AVIOContext *pb = wtv->pb;
787 while (!pb->eof_reached) {
788 ff_asf_guid g;
789 int len, sid, consumed;
790
791 ff_get_guid(pb, &g);
792 len = avio_rl32(pb);
793 if (len < 32)
794 break;
795 sid = avio_rl32(pb) & 0x7FFF;
796 avio_skip(pb, 8);
797 consumed = 32;
798
799 if (!ff_guidcmp(g, stream_guid)) {
800 if (ff_find_stream_index(s, sid) < 0) {
801 ff_asf_guid mediatype, subtype, formattype;
802 int size;
803 avio_skip(pb, 28);
804 ff_get_guid(pb, &mediatype);
805 ff_get_guid(pb, &subtype);
806 avio_skip(pb, 12);
807 ff_get_guid(pb, &formattype);
808 size = avio_rl32(pb);
809 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
810 consumed += 92 + size;
811 }
812 } else if (!ff_guidcmp(g, stream2_guid)) {
813 int stream_index = ff_find_stream_index(s, sid);
814 if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
815 ff_asf_guid mediatype, subtype, formattype;
816 int size;
817 avio_skip(pb, 12);
818 ff_get_guid(pb, &mediatype);
819 ff_get_guid(pb, &subtype);
820 avio_skip(pb, 12);
821 ff_get_guid(pb, &formattype);
822 size = avio_rl32(pb);
823 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
824 consumed += 76 + size;
825 }
826 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
827 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
828 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
829 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
830 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
831 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
832 int stream_index = ff_find_stream_index(s, sid);
833 if (stream_index >= 0) {
834 AVStream *st = s->streams[stream_index];
835 uint8_t buf[258];
836 const uint8_t *pbuf = buf;
837 int buf_size;
838
839 avio_skip(pb, 8);
840 consumed += 8;
841 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
842 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
843 avio_skip(pb, 6);
844 consumed += 6;
845 }
846
847 buf_size = FFMIN(len - consumed, sizeof(buf));
848 avio_read(pb, buf, buf_size);
849 consumed += buf_size;
850 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
851 }
852 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
853 int stream_index = ff_find_stream_index(s, sid);
854 if (stream_index >= 0) {
855 AVStream *st = s->streams[stream_index];
856 int audio_type;
857 avio_skip(pb, 8);
858 audio_type = avio_r8(pb);
859 if (audio_type == 2)
860 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
861 else if (audio_type == 3)
862 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
863 consumed += 9;
864 }
865 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
866 int stream_index = ff_find_stream_index(s, sid);
867 if (stream_index >= 0) {
868 avio_skip(pb, 12);
869 if (avio_rl32(pb))
870 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
871 consumed += 16;
872 }
873 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
874 int stream_index = ff_find_stream_index(s, sid);
875 if (stream_index >= 0) {
876 AVStream *st = s->streams[stream_index];
877 uint8_t language[4];
878 avio_skip(pb, 12);
879 avio_read(pb, language, 3);
880 if (language[0]) {
881 language[3] = 0;
882 av_dict_set(&st->metadata, "language", language, 0);
883 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
884 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
885 }
886 consumed += 15;
887 }
888 } else if (!ff_guidcmp(g, timestamp_guid)) {
889 int stream_index = ff_find_stream_index(s, sid);
890 if (stream_index >= 0) {
891 avio_skip(pb, 8);
892 wtv->pts = avio_rl64(pb);
893 consumed += 16;
894 if (wtv->pts == -1)
895 wtv->pts = AV_NOPTS_VALUE;
896 else {
897 wtv->last_valid_pts = wtv->pts;
898 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
899 wtv->epoch = wtv->pts;
900 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
901 #define WTV_PAD8(x) (((x) + 7) & ~7)
902 avio_skip(pb, WTV_PAD8(len) - consumed);
903 return 0;
904 }
905 }
906 }
907 } else if (!ff_guidcmp(g, data_guid)) {
908 int stream_index = ff_find_stream_index(s, sid);
909 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
910 WtvStream *wst = s->streams[stream_index]->priv_data;
911 wst->seen_data = 1;
912 if (len_ptr) {
913 *len_ptr = len;
914 }
915 return stream_index;
916 }
917 } else if (
918 !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}) ||
919 !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}) ||
920 !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}) ||
921 !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}) ||
922 !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}) ||
923 !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}) ||
924 !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}) ||
925 !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}) ||
926 !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}) ||
927 !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}) ||
928 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
929 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
930 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
931 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
932 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
933 !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
934 !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
935 !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
936 //ignore known guids
937 } else
938 av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
939
940 avio_skip(pb, WTV_PAD8(len) - consumed);
941 }
942 return AVERROR_EOF;
943 }
944
945 /* declare utf16le strings */
946 #define _ , 0,
947 static const uint8_t timeline_le16[] =
948 {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
949 static const uint8_t table_0_entries_legacy_attrib_le16[] =
950 {'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};
951 static const uint8_t table_0_entries_time_le16[] =
952 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
953 static const uint8_t timeline_table_0_entries_Events_le16[] =
954 {'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};
955 #undef _
956
957 static int read_header(AVFormatContext *s)
958 {
959 WtvContext *wtv = s->priv_data;
960 int root_sector, root_size;
961 uint8_t root[WTV_SECTOR_SIZE];
962 AVIOContext *pb;
963 int64_t timeline_pos;
964 int ret;
965
966 wtv->epoch =
967 wtv->pts =
968 wtv->last_valid_pts = AV_NOPTS_VALUE;
969
970 /* read root directory sector */
971 avio_skip(s->pb, 0x30);
972 root_size = avio_rl32(s->pb);
973 if (root_size > sizeof(root)) {
974 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
975 return AVERROR_INVALIDDATA;
976 }
977 avio_skip(s->pb, 4);
978 root_sector = avio_rl32(s->pb);
979
980 ret = seek_by_sector(s->pb, root_sector, 0);
981 if (ret < 0)
982 return ret;
983 root_size = avio_read(s->pb, root, root_size);
984 if (root_size < 0)
985 return AVERROR_INVALIDDATA;
986
987 /* parse chunks up until first data chunk */
988 wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
989 if (!wtv->pb) {
990 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
991 return AVERROR_INVALIDDATA;
992 }
993
994 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
995 if (ret < 0)
996 return ret;
997 avio_seek(wtv->pb, -32, SEEK_CUR);
998
999 timeline_pos = avio_tell(s->pb); // save before opening another file
1000
1001 /* read metadata */
1002 pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
1003 if (pb) {
1004 parse_legacy_attrib(s, pb);
1005 wtvfile_close(pb);
1006 }
1007
1008 /* read seek index */
1009 if (s->nb_streams) {
1010 AVStream *st = s->streams[0];
1011 pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1012 if (pb) {
1013 while(1) {
1014 uint64_t timestamp = avio_rl64(pb);
1015 uint64_t frame_nb = avio_rl64(pb);
1016 if (pb->eof_reached)
1017 break;
1018 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1019 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1020 }
1021 wtvfile_close(pb);
1022
1023 if (wtv->nb_index_entries) {
1024 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1025 if (pb) {
1026 int i;
1027 while (1) {
1028 uint64_t frame_nb = avio_rl64(pb);
1029 uint64_t position = avio_rl64(pb);
1030 if (pb->eof_reached)
1031 break;
1032 for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1033 AVIndexEntry *e = wtv->index_entries + i;
1034 if (frame_nb > e->size)
1035 break;
1036 if (position > e->pos)
1037 e->pos = position;
1038 }
1039 }
1040 wtvfile_close(pb);
1041 st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1042 }
1043 }
1044 }
1045 }
1046
1047 avio_seek(s->pb, timeline_pos, SEEK_SET);
1048 return 0;
1049 }
1050
1051 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1052 {
1053 WtvContext *wtv = s->priv_data;
1054 AVIOContext *pb = wtv->pb;
1055 int stream_index, len, ret;
1056
1057 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1058 if (stream_index < 0)
1059 return stream_index;
1060
1061 ret = av_get_packet(pb, pkt, len - 32);
1062 if (ret < 0)
1063 return ret;
1064 pkt->stream_index = stream_index;
1065 pkt->pts = wtv->pts;
1066 avio_skip(pb, WTV_PAD8(len) - len);
1067 return 0;
1068 }
1069
1070 static int read_seek(AVFormatContext *s, int stream_index,
1071 int64_t ts, int flags)
1072 {
1073 WtvContext *wtv = s->priv_data;
1074 AVIOContext *pb = wtv->pb;
1075 AVStream *st = s->streams[0];
1076 int64_t ts_relative;
1077 int i;
1078
1079 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1080 return AVERROR(ENOSYS);
1081
1082 /* timestamp adjustment is required because wtv->pts values are absolute,
1083 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1084 ts_relative = ts;
1085 if (wtv->epoch != AV_NOPTS_VALUE)
1086 ts_relative -= wtv->epoch;
1087
1088 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1089 if (i < 0) {
1090 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1091 avio_seek(pb, 0, SEEK_SET);
1092 else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1093 avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1094 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1095 return AVERROR(ERANGE);
1096 return 0;
1097 }
1098 wtv->pts = wtv->index_entries[i].timestamp;
1099 if (wtv->epoch != AV_NOPTS_VALUE)
1100 wtv->pts += wtv->epoch;
1101 wtv->last_valid_pts = wtv->pts;
1102 avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1103 return 0;
1104 }
1105
1106 static int read_close(AVFormatContext *s)
1107 {
1108 WtvContext *wtv = s->priv_data;
1109 av_free(wtv->index_entries);
1110 wtvfile_close(wtv->pb);
1111 return 0;
1112 }
1113
1114 AVInputFormat ff_wtv_demuxer = {
1115 .name = "wtv",
1116 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1117 .priv_data_size = sizeof(WtvContext),
1118 .read_probe = read_probe,
1119 .read_header = read_header,
1120 .read_packet = read_packet,
1121 .read_seek = read_seek,
1122 .read_close = read_close,
1123 .flags = AVFMT_SHOW_IDS,
1124 };