2e5d39cff2e4865d858fe4f7f7ca1de3a7790600
[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_GUID \
40 "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
41 #define ARG_GUID(g) \
42 g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
43
44 #define PRI_PRETTY_GUID \
45 "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
46 #define ARG_PRETTY_GUID(g) \
47 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]
48 #define LEN_PRETTY_GUID 34
49
50 /*
51 *
52 * File system routines
53 *
54 */
55
56 #define WTV_SECTOR_BITS 12
57 #define WTV_SECTOR_SIZE (1 << WTV_SECTOR_BITS)
58 #define WTV_BIGSECTOR_BITS 18
59
60 typedef struct {
61 AVIOContext *pb_filesystem; /** file system (AVFormatContext->pb) */
62
63 int sector_bits; /** sector shift bits; used to convert sector number into pb_filesystem offset */
64 uint32_t *sectors; /** file allocation table */
65 int nb_sectors; /** number of sectors */
66
67 int error;
68 int64_t position;
69 int64_t length;
70 } WtvFile;
71
72 /**
73 * @return bytes read, 0 on end of file, or <0 on error
74 */
75 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
76 {
77 WtvFile *wf = opaque;
78 AVIOContext *pb = wf->pb_filesystem;
79 int nread = 0;
80
81 if (wf->error || pb->error)
82 return -1;
83 if (wf->position >= wf->length || pb->eof_reached)
84 return 0;
85
86 buf_size = FFMIN(buf_size, wf->length - wf->position);
87 while(nread < buf_size) {
88 int n;
89 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
90 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
91
92 n = avio_read(pb, buf, read_request);
93 if (n <= 0)
94 break;
95 nread += n;
96 buf += n;
97 wf->position += n;
98 if (n == remaining_in_sector) {
99 int i = wf->position >> wf->sector_bits;
100 if (i >= wf->nb_sectors ||
101 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
102 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
103 wf->error = 1;
104 break;
105 }
106 }
107 }
108 return nread;
109 }
110
111 /**
112 * @return position (or file length)
113 */
114 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
115 {
116 WtvFile *wf = opaque;
117 AVIOContext *pb = wf->pb_filesystem;
118
119 if (whence == AVSEEK_SIZE)
120 return wf->length;
121 else if (whence == SEEK_CUR)
122 offset = wf->position + offset;
123 else if (whence == SEEK_END)
124 offset = wf->length;
125
126 wf->error = offset < 0 || offset >= wf->length ||
127 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
128 + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
129 wf->position = offset;
130 return offset;
131 }
132
133 /**
134 * read non-zero integers (le32) from input stream
135 * @param pb
136 * @param[out] data destination
137 * @param count maximum number of integers to read
138 * @return total number of integers read
139 */
140 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
141 {
142 int i, total = 0;
143 for (i = 0; i < count; i++) {
144 if ((data[total] = avio_rl32(pb)))
145 total++;
146 }
147 return total;
148 }
149
150 /**
151 * Open file
152 * @param first_sector First sector
153 * @param length Length of file (bytes)
154 * @param depth File allocation table depth
155 * @return NULL on error
156 */
157 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
158 {
159 AVIOContext *pb;
160 WtvFile *wf;
161 uint8_t *buffer;
162
163 if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
164 return NULL;
165
166 wf = av_mallocz(sizeof(WtvFile));
167 if (!wf)
168 return NULL;
169
170 if (depth == 0) {
171 wf->sectors = av_malloc(sizeof(uint32_t));
172 if (!wf->sectors) {
173 av_free(wf);
174 return NULL;
175 }
176 wf->sectors[0] = first_sector;
177 wf->nb_sectors = 1;
178 wf->sector_bits = WTV_SECTOR_BITS;
179 } else if (depth == 1) {
180 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
181 if (!wf->sectors) {
182 av_free(wf);
183 return NULL;
184 }
185 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
186 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
187 } else if (depth == 2) {
188 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
189 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
190 int i;
191
192 wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
193 if (!wf->sectors) {
194 av_free(wf);
195 return NULL;
196 }
197 wf->nb_sectors = 0;
198 for (i = 0; i < nb_sectors1; i++) {
199 if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
200 break;
201 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
202 }
203 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
204 } else {
205 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
206 av_free(wf);
207 return NULL;
208 }
209
210 if (!wf->nb_sectors) {
211 av_free(wf->sectors);
212 av_free(wf);
213 return NULL;
214 }
215
216 /* check length */
217 length &= 0xFFFFFFFFFFFF;
218 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
219 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);
220 length = (int64_t)wf->nb_sectors << wf->sector_bits;
221 }
222 wf->length = length;
223
224 /* seek to initial sector */
225 wf->position = 0;
226 if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
227 av_free(wf->sectors);
228 av_free(wf);
229 return NULL;
230 }
231
232 wf->pb_filesystem = s->pb;
233 buffer = av_malloc(1 << wf->sector_bits);
234 if (!buffer) {
235 av_free(wf->sectors);
236 av_free(wf);
237 return NULL;
238 }
239
240 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
241 wtvfile_read_packet, NULL, wtvfile_seek);
242 if (!pb) {
243 av_free(buffer);
244 av_free(wf->sectors);
245 av_free(wf);
246 }
247 return pb;
248 }
249
250 static const ff_asf_guid dir_entry_guid =
251 {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
252
253 /**
254 * Open file using filename
255 * @param[in] buf directory buffer
256 * @param buf_size directory buffer size
257 * @param[in] filename
258 * @param filename_size size of filename
259 * @return NULL on error
260 */
261 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
262 {
263 const uint8_t *buf_end = buf + buf_size;
264
265 while(buf + 48 <= buf_end) {
266 int dir_length, name_size, first_sector, depth;
267 uint64_t file_length;
268 const uint8_t *name;
269 if (ff_guidcmp(buf, dir_entry_guid)) {
270 av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
271 "remaining directory entries ignored\n", ARG_GUID(buf));
272 break;
273 }
274 dir_length = AV_RL16(buf + 16);
275 file_length = AV_RL64(buf + 24);
276 name_size = 2 * AV_RL32(buf + 32);
277 if (buf + 48 + name_size > buf_end) {
278 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
279 break;
280 }
281 first_sector = AV_RL32(buf + 40 + name_size);
282 depth = AV_RL32(buf + 44 + name_size);
283
284 /* compare file name; test optional null terminator */
285 name = buf + 40;
286 if (name_size >= filename_size &&
287 !memcmp(name, filename, filename_size) &&
288 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
289 return wtvfile_open_sector(first_sector, file_length, depth, s);
290
291 buf += dir_length;
292 }
293 return 0;
294 }
295
296 #define wtvfile_open(s, buf, buf_size, filename) \
297 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
298
299 /**
300 * Close file opened with wtvfile_open_sector(), or wtv_open()
301 */
302 static void wtvfile_close(AVIOContext *pb)
303 {
304 WtvFile *wf = pb->opaque;
305 av_free(wf->sectors);
306 av_free(wf);
307 av_free(pb->buffer);
308 av_free(pb);
309 }
310
311 /*
312 *
313 * Main demuxer
314 *
315 */
316
317 typedef struct {
318 int seen_data;
319 } WtvStream;
320
321 typedef struct {
322 AVIOContext *pb; /** timeline file */
323 int64_t epoch;
324 int64_t pts; /** pts for next data chunk */
325 int64_t last_valid_pts; /** latest valid pts, used for interative seeking */
326
327 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
328 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
329 AVIndexEntry *index_entries;
330 int nb_index_entries;
331 unsigned int index_entries_allocated_size;
332 } WtvContext;
333
334 typedef struct {
335 enum AVCodecID id;
336 ff_asf_guid guid;
337 } AVCodecGuid;
338
339 static enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
340 {
341 int i;
342 for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++) {
343 if (!ff_guidcmp(guids[i].guid, guid))
344 return guids[i].id;
345 }
346 return AV_CODEC_ID_NONE;
347 }
348
349 /* WTV GUIDs */
350 static const ff_asf_guid wtv_guid =
351 {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
352 static const ff_asf_guid metadata_guid =
353 {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
354 static const ff_asf_guid timestamp_guid =
355 {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
356 static const ff_asf_guid data_guid =
357 {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
358 static const ff_asf_guid stream_guid =
359 {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
360 static const ff_asf_guid stream2_guid =
361 {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
362 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
363 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
364 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
365 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
366 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
367 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
368 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
369 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
370 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
371 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
372 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
373 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
374 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
375 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
376 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
377 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
378 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
379 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
380
381 /* Windows media GUIDs */
382
383 #define MEDIASUBTYPE_BASE_GUID \
384 0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
385
386 /* Media types */
387 static const ff_asf_guid mediatype_audio =
388 {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
389 static const ff_asf_guid mediatype_video =
390 {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
391 static const ff_asf_guid mediasubtype_mpeg1payload =
392 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
393 static const ff_asf_guid mediatype_mpeg2_sections =
394 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
395 static const ff_asf_guid mediatype_mpeg2_pes =
396 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
397 static const ff_asf_guid mediatype_mstvcaption =
398 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
399
400 /* Media subtypes */
401 static const ff_asf_guid mediasubtype_cpfilters_processed =
402 {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
403 static const ff_asf_guid mediasubtype_dvb_subtitle =
404 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
405 static const ff_asf_guid mediasubtype_teletext =
406 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
407 static const ff_asf_guid mediasubtype_dtvccdata =
408 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
409 static const ff_asf_guid mediasubtype_mpeg2_sections =
410 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
411
412 /* Formats */
413 static const ff_asf_guid format_cpfilters_processed =
414 {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
415 static const ff_asf_guid format_waveformatex =
416 {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
417 static const ff_asf_guid format_videoinfo2 =
418 {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
419 static const ff_asf_guid format_mpeg2_video =
420 {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
421 static const ff_asf_guid format_none =
422 {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
423
424 static const AVCodecGuid video_guids[] = {
425 {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
426 {AV_CODEC_ID_NONE}
427 };
428
429 static const AVCodecGuid audio_guids[] = {
430 {AV_CODEC_ID_AC3, {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
431 {AV_CODEC_ID_EAC3, {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
432 {AV_CODEC_ID_MP2, {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
433 {AV_CODEC_ID_NONE}
434 };
435
436 static int read_probe(AVProbeData *p)
437 {
438 return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
439 }
440
441 /**
442 * Convert win32 FILETIME to ISO-8601 string
443 */
444 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
445 {
446 time_t t = (value / 10000000LL) - 11644473600LL;
447 struct tm *tm = gmtime(&t);
448 if (tm)
449 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
450 else
451 buf[0] = '\0';
452 }
453
454 /**
455 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
456 */
457 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
458 {
459 time_t t = (value / 10000000LL) - 719162LL*86400LL;
460 struct tm *tm = gmtime(&t);
461 if (tm)
462 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
463 else
464 buf[0] = '\0';
465 }
466
467 /**
468 * Convert OLE DATE to ISO-8601 string
469 */
470 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
471 {
472 time_t t = 631112400LL + 86400*av_int2double(value);
473 struct tm *tm = gmtime(&t);
474 if (tm)
475 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
476 else
477 buf[0] = '\0';
478 }
479
480 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
481 {
482 char mime[1024];
483 char description[1024];
484 unsigned int filesize;
485 AVStream *st;
486 int64_t pos = avio_tell(pb);
487
488 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
489 if (strcmp(mime, "image/jpeg"))
490 goto done;
491
492 avio_r8(pb);
493 avio_get_str16le(pb, INT_MAX, description, sizeof(description));
494 filesize = avio_rl32(pb);
495 if (!filesize)
496 goto done;
497
498 st = avformat_new_stream(s, NULL);
499 if (!st)
500 goto done;
501 av_dict_set(&st->metadata, "title", description, 0);
502 st->codec->codec_id = AV_CODEC_ID_MJPEG;
503 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
504 st->codec->extradata = av_mallocz(filesize);
505 if (!st->codec->extradata)
506 goto done;
507 st->codec->extradata_size = filesize;
508 avio_read(pb, st->codec->extradata, filesize);
509 done:
510 avio_seek(pb, pos + length, SEEK_SET);
511 }
512
513 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
514 {
515 int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
516 char *buf = av_malloc(buf_size);
517 if (!buf)
518 return;
519
520 if (type == 0 && length == 4) {
521 snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
522 } else if (type == 1) {
523 avio_get_str16le(pb, length, buf, buf_size);
524 if (!strlen(buf)) {
525 av_free(buf);
526 return;
527 }
528 } else if (type == 3 && length == 4) {
529 strcpy(buf, avio_rl32(pb) ? "true" : "false");
530 } else if (type == 4 && length == 8) {
531 int64_t num = avio_rl64(pb);
532 if (!strcmp(key, "WM/EncodingTime") ||
533 !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
534 filetime_to_iso8601(buf, buf_size, num);
535 else if (!strcmp(key, "WM/WMRVEncodeTime") ||
536 !strcmp(key, "WM/WMRVEndTime"))
537 crazytime_to_iso8601(buf, buf_size, num);
538 else if (!strcmp(key, "WM/WMRVExpirationDate"))
539 oledate_to_iso8601(buf, buf_size, num);
540 else if (!strcmp(key, "WM/WMRVBitrate"))
541 snprintf(buf, buf_size, "%f", av_int2double(num));
542 else
543 snprintf(buf, buf_size, "%"PRIi64, num);
544 } else if (type == 5 && length == 2) {
545 snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
546 } else if (type == 6 && length == 16) {
547 ff_asf_guid guid;
548 avio_read(pb, guid, 16);
549 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
550 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
551 get_attachment(s, pb, length);
552 av_freep(&buf);
553 return;
554 } else {
555 av_freep(&buf);
556 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
557 avio_skip(pb, length);
558 return;
559 }
560
561 av_dict_set(&s->metadata, key, buf, 0);
562 av_freep(&buf);
563 }
564
565 /**
566 * Parse metadata entries
567 */
568 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
569 {
570 ff_asf_guid guid;
571 int length, type;
572 while(!pb->eof_reached) {
573 char key[1024];
574 ff_get_guid(pb, &guid);
575 type = avio_rl32(pb);
576 length = avio_rl32(pb);
577 if (!length)
578 break;
579 if (ff_guidcmp(&guid, metadata_guid)) {
580 av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
581 "remaining metadata entries ignored\n", ARG_GUID(guid));
582 break;
583 }
584 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
585 get_tag(s, pb, key, type, length);
586 }
587
588 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
589 }
590
591 /**
592 * parse VIDEOINFOHEADER2 structure
593 * @return bytes consumed
594 */
595 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
596 {
597 WtvContext *wtv = s->priv_data;
598 AVIOContext *pb = wtv->pb;
599
600 avio_skip(pb, 72); // picture aspect ratio is unreliable
601 ff_get_bmp_header(pb, st);
602
603 return 72 + 40;
604 }
605
606 /**
607 * Parse MPEG1WAVEFORMATEX extradata structure
608 */
609 static void parse_mpeg1waveformatex(AVStream *st)
610 {
611 /* fwHeadLayer */
612 switch (AV_RL16(st->codec->extradata)) {
613 case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
614 case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
615 case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
616 }
617
618 st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
619
620 /* dwHeadMode */
621 switch (AV_RL16(st->codec->extradata + 6)) {
622 case 1 :
623 case 2 :
624 case 4 : st->codec->channels = 2;
625 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
626 break;
627 case 8 : st->codec->channels = 1;
628 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
629 break;
630 }
631 }
632
633 /**
634 * Initialise stream
635 * @param st Stream to initialise, or NULL to create and initialise new stream
636 * @return NULL on error
637 */
638 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
639 {
640 if (st) {
641 if (st->codec->extradata) {
642 av_freep(&st->codec->extradata);
643 st->codec->extradata_size = 0;
644 }
645 } else {
646 WtvStream *wst = av_mallocz(sizeof(WtvStream));
647 if (!wst)
648 return NULL;
649 st = avformat_new_stream(s, NULL);
650 if (!st)
651 return NULL;
652 st->id = sid;
653 st->priv_data = wst;
654 }
655 st->codec->codec_type = codec_type;
656 st->need_parsing = AVSTREAM_PARSE_FULL;
657 avpriv_set_pts_info(st, 64, 1, 10000000);
658 return st;
659 }
660
661 /**
662 * parse Media Type structure and populate stream
663 * @param st Stream, or NULL to create new stream
664 * @param mediatype Mediatype GUID
665 * @param subtype Subtype GUID
666 * @param formattype Format GUID
667 * @param size Size of format buffer
668 * @return NULL on error
669 */
670 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
671 ff_asf_guid mediatype, ff_asf_guid subtype,
672 ff_asf_guid formattype, int size)
673 {
674 WtvContext *wtv = s->priv_data;
675 AVIOContext *pb = wtv->pb;
676 if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
677 !ff_guidcmp(formattype, format_cpfilters_processed)) {
678 ff_asf_guid actual_subtype;
679 ff_asf_guid actual_formattype;
680
681 if (size < 32) {
682 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
683 avio_skip(pb, size);
684 return NULL;
685 }
686
687 avio_skip(pb, size - 32);
688 ff_get_guid(pb, &actual_subtype);
689 ff_get_guid(pb, &actual_formattype);
690 avio_seek(pb, -size, SEEK_CUR);
691
692 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
693 avio_skip(pb, 32);
694 return st;
695 } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
696 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
697 if (!st)
698 return NULL;
699 if (!ff_guidcmp(formattype, format_waveformatex)) {
700 int ret = ff_get_wav_header(pb, st->codec, size);
701 if (ret < 0)
702 return NULL;
703 } else {
704 if (ff_guidcmp(formattype, format_none))
705 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
706 avio_skip(pb, size);
707 }
708
709 if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
710 st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
711 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
712 if (st->codec->extradata && st->codec->extradata_size >= 22)
713 parse_mpeg1waveformatex(st);
714 else
715 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
716 } else {
717 st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
718 if (st->codec->codec_id == AV_CODEC_ID_NONE)
719 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
720 }
721 return st;
722 } else if (!ff_guidcmp(mediatype, mediatype_video)) {
723 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
724 if (!st)
725 return NULL;
726 if (!ff_guidcmp(formattype, format_videoinfo2)) {
727 int consumed = parse_videoinfoheader2(s, st);
728 avio_skip(pb, FFMAX(size - consumed, 0));
729 } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
730 int consumed = parse_videoinfoheader2(s, st);
731 avio_skip(pb, FFMAX(size - consumed, 0));
732 } else {
733 if (ff_guidcmp(formattype, format_none))
734 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
735 avio_skip(pb, size);
736 }
737
738 if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
739 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
740 } else {
741 st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
742 }
743 if (st->codec->codec_id == AV_CODEC_ID_NONE)
744 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
745 return st;
746 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
747 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
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:"PRI_GUID"\n", ARG_GUID(formattype));
753 avio_skip(pb, size);
754 st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
755 return st;
756 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
757 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
758 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
759 if (!st)
760 return NULL;
761 if (ff_guidcmp(formattype, format_none))
762 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
763 avio_skip(pb, size);
764 st->codec->codec_id = AV_CODEC_ID_DVB_TELETEXT;
765 return st;
766 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
767 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
768 if (ff_guidcmp(formattype, format_none))
769 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
770 avio_skip(pb, size);
771 return NULL;
772 }
773
774 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
775 ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
776 ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
777 avio_skip(pb, size);
778 return NULL;
779 }
780
781 enum {
782 SEEK_TO_DATA = 0,
783 SEEK_TO_PTS,
784 };
785
786 /**
787 * Parse WTV chunks
788 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
789 * @param seekts timestamp
790 * @param[out] len_ptr Length of data chunk
791 * @return stream index of data chunk, or <0 on error
792 */
793 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
794 {
795 WtvContext *wtv = s->priv_data;
796 AVIOContext *pb = wtv->pb;
797 while (!pb->eof_reached) {
798 ff_asf_guid g;
799 int len, sid, consumed;
800
801 ff_get_guid(pb, &g);
802 len = avio_rl32(pb);
803 if (len < 32)
804 break;
805 sid = avio_rl32(pb) & 0x7FFF;
806 avio_skip(pb, 8);
807 consumed = 32;
808
809 if (!ff_guidcmp(g, stream_guid)) {
810 if (ff_find_stream_index(s, sid) < 0) {
811 ff_asf_guid mediatype, subtype, formattype;
812 int size;
813 avio_skip(pb, 28);
814 ff_get_guid(pb, &mediatype);
815 ff_get_guid(pb, &subtype);
816 avio_skip(pb, 12);
817 ff_get_guid(pb, &formattype);
818 size = avio_rl32(pb);
819 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
820 consumed += 92 + size;
821 }
822 } else if (!ff_guidcmp(g, stream2_guid)) {
823 int stream_index = ff_find_stream_index(s, sid);
824 if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
825 ff_asf_guid mediatype, subtype, formattype;
826 int size;
827 avio_skip(pb, 12);
828 ff_get_guid(pb, &mediatype);
829 ff_get_guid(pb, &subtype);
830 avio_skip(pb, 12);
831 ff_get_guid(pb, &formattype);
832 size = avio_rl32(pb);
833 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
834 consumed += 76 + size;
835 }
836 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
837 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
838 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
839 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
840 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
841 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
842 int stream_index = ff_find_stream_index(s, sid);
843 if (stream_index >= 0) {
844 AVStream *st = s->streams[stream_index];
845 uint8_t buf[258];
846 const uint8_t *pbuf = buf;
847 int buf_size;
848
849 avio_skip(pb, 8);
850 consumed += 8;
851 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
852 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
853 avio_skip(pb, 6);
854 consumed += 6;
855 }
856
857 buf_size = FFMIN(len - consumed, sizeof(buf));
858 avio_read(pb, buf, buf_size);
859 consumed += buf_size;
860 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
861 }
862 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
863 int stream_index = ff_find_stream_index(s, sid);
864 if (stream_index >= 0) {
865 AVStream *st = s->streams[stream_index];
866 int audio_type;
867 avio_skip(pb, 8);
868 audio_type = avio_r8(pb);
869 if (audio_type == 2)
870 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
871 else if (audio_type == 3)
872 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
873 consumed += 9;
874 }
875 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
876 int stream_index = ff_find_stream_index(s, sid);
877 if (stream_index >= 0) {
878 avio_skip(pb, 12);
879 if (avio_rl32(pb))
880 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
881 consumed += 16;
882 }
883 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
884 int stream_index = ff_find_stream_index(s, sid);
885 if (stream_index >= 0) {
886 AVStream *st = s->streams[stream_index];
887 uint8_t language[4];
888 avio_skip(pb, 12);
889 avio_read(pb, language, 3);
890 if (language[0]) {
891 language[3] = 0;
892 av_dict_set(&st->metadata, "language", language, 0);
893 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
894 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
895 }
896 consumed += 15;
897 }
898 } else if (!ff_guidcmp(g, timestamp_guid)) {
899 int stream_index = ff_find_stream_index(s, sid);
900 if (stream_index >= 0) {
901 avio_skip(pb, 8);
902 wtv->pts = avio_rl64(pb);
903 consumed += 16;
904 if (wtv->pts == -1)
905 wtv->pts = AV_NOPTS_VALUE;
906 else {
907 wtv->last_valid_pts = wtv->pts;
908 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
909 wtv->epoch = wtv->pts;
910 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
911 #define WTV_PAD8(x) (((x) + 7) & ~7)
912 avio_skip(pb, WTV_PAD8(len) - consumed);
913 return 0;
914 }
915 }
916 }
917 } else if (!ff_guidcmp(g, data_guid)) {
918 int stream_index = ff_find_stream_index(s, sid);
919 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
920 WtvStream *wst = s->streams[stream_index]->priv_data;
921 wst->seen_data = 1;
922 if (len_ptr) {
923 *len_ptr = len;
924 }
925 return stream_index;
926 }
927 } else if (
928 !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}) ||
929 !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}) ||
930 !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}) ||
931 !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}) ||
932 !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}) ||
933 !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}) ||
934 !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}) ||
935 !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}) ||
936 !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}) ||
937 !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}) ||
938 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
939 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
940 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
941 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
942 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
943 !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
944 !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
945 !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
946 //ignore known guids
947 } else
948 av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
949
950 avio_skip(pb, WTV_PAD8(len) - consumed);
951 }
952 return AVERROR_EOF;
953 }
954
955 /* declare utf16le strings */
956 #define _ , 0,
957 static const uint8_t timeline_le16[] =
958 {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
959 static const uint8_t table_0_entries_legacy_attrib_le16[] =
960 {'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};
961 static const uint8_t table_0_entries_time_le16[] =
962 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
963 static const uint8_t timeline_table_0_entries_Events_le16[] =
964 {'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};
965 #undef _
966
967 static int read_header(AVFormatContext *s)
968 {
969 WtvContext *wtv = s->priv_data;
970 int root_sector, root_size;
971 uint8_t root[WTV_SECTOR_SIZE];
972 AVIOContext *pb;
973 int64_t timeline_pos;
974 int ret;
975
976 wtv->epoch =
977 wtv->pts =
978 wtv->last_valid_pts = AV_NOPTS_VALUE;
979
980 /* read root directory sector */
981 avio_skip(s->pb, 0x30);
982 root_size = avio_rl32(s->pb);
983 if (root_size > sizeof(root)) {
984 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
985 return AVERROR_INVALIDDATA;
986 }
987 avio_skip(s->pb, 4);
988 root_sector = avio_rl32(s->pb);
989
990 avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
991 root_size = avio_read(s->pb, root, root_size);
992 if (root_size < 0)
993 return AVERROR_INVALIDDATA;
994
995 /* parse chunks up until first data chunk */
996 wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
997 if (!wtv->pb) {
998 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
999 return AVERROR_INVALIDDATA;
1000 }
1001
1002 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
1003 if (ret < 0)
1004 return ret;
1005 avio_seek(wtv->pb, -32, SEEK_CUR);
1006
1007 timeline_pos = avio_tell(s->pb); // save before opening another file
1008
1009 /* read metadata */
1010 pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
1011 if (pb) {
1012 parse_legacy_attrib(s, pb);
1013 wtvfile_close(pb);
1014 }
1015
1016 /* read seek index */
1017 if (s->nb_streams) {
1018 AVStream *st = s->streams[0];
1019 pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1020 if (pb) {
1021 while(1) {
1022 uint64_t timestamp = avio_rl64(pb);
1023 uint64_t frame_nb = avio_rl64(pb);
1024 if (pb->eof_reached)
1025 break;
1026 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1027 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1028 }
1029 wtvfile_close(pb);
1030
1031 if (wtv->nb_index_entries) {
1032 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1033 if (pb) {
1034 int i;
1035 while (1) {
1036 uint64_t frame_nb = avio_rl64(pb);
1037 uint64_t position = avio_rl64(pb);
1038 if (pb->eof_reached)
1039 break;
1040 for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1041 AVIndexEntry *e = wtv->index_entries + i;
1042 if (frame_nb > e->size)
1043 break;
1044 if (position > e->pos)
1045 e->pos = position;
1046 }
1047 }
1048 wtvfile_close(pb);
1049 st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1050 }
1051 }
1052 }
1053 }
1054
1055 avio_seek(s->pb, timeline_pos, SEEK_SET);
1056 return 0;
1057 }
1058
1059 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1060 {
1061 WtvContext *wtv = s->priv_data;
1062 AVIOContext *pb = wtv->pb;
1063 int stream_index, len, ret;
1064
1065 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1066 if (stream_index < 0)
1067 return stream_index;
1068
1069 ret = av_get_packet(pb, pkt, len - 32);
1070 if (ret < 0)
1071 return ret;
1072 pkt->stream_index = stream_index;
1073 pkt->pts = wtv->pts;
1074 avio_skip(pb, WTV_PAD8(len) - len);
1075 return 0;
1076 }
1077
1078 static int read_seek(AVFormatContext *s, int stream_index,
1079 int64_t ts, int flags)
1080 {
1081 WtvContext *wtv = s->priv_data;
1082 AVIOContext *pb = wtv->pb;
1083 AVStream *st = s->streams[0];
1084 int64_t ts_relative;
1085 int i;
1086
1087 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1088 return AVERROR(ENOSYS);
1089
1090 /* timestamp adjustment is required because wtv->pts values are absolute,
1091 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1092 ts_relative = ts;
1093 if (wtv->epoch != AV_NOPTS_VALUE)
1094 ts_relative -= wtv->epoch;
1095
1096 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1097 if (i < 0) {
1098 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1099 avio_seek(pb, 0, SEEK_SET);
1100 else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1101 avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1102 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1103 return AVERROR(ERANGE);
1104 return 0;
1105 }
1106 wtv->pts = wtv->index_entries[i].timestamp;
1107 if (wtv->epoch != AV_NOPTS_VALUE)
1108 wtv->pts += wtv->epoch;
1109 wtv->last_valid_pts = wtv->pts;
1110 avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1111 return 0;
1112 }
1113
1114 static int read_close(AVFormatContext *s)
1115 {
1116 WtvContext *wtv = s->priv_data;
1117 av_free(wtv->index_entries);
1118 wtvfile_close(wtv->pb);
1119 return 0;
1120 }
1121
1122 AVInputFormat ff_wtv_demuxer = {
1123 .name = "wtv",
1124 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1125 .priv_data_size = sizeof(WtvContext),
1126 .read_probe = read_probe,
1127 .read_header = read_header,
1128 .read_packet = read_packet,
1129 .read_seek = read_seek,
1130 .read_close = read_close,
1131 .flags = AVFMT_SHOW_IDS,
1132 };