handle malloc failures in ff_get_wav_header
[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/intreadwrite.h"
29 #include "libavutil/intfloat_readwrite.h"
30 #include "avformat.h"
31 #include "internal.h"
32 #include "riff.h"
33 #include "asf.h"
34 #include "mpegts.h"
35 #include <strings.h>
36
37 /* Macros for formating GUIDs */
38 #define PRI_GUID \
39 "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
40 #define ARG_GUID(g) \
41 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]
42
43 #define PRI_PRETTY_GUID \
44 "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
45 #define ARG_PRETTY_GUID(g) \
46 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]
47 #define LEN_PRETTY_GUID 34
48
49 /*
50 *
51 * File system routines
52 *
53 */
54
55 #define WTV_SECTOR_BITS 12
56 #define WTV_SECTOR_SIZE (1 << WTV_SECTOR_BITS)
57 #define WTV_BIGSECTOR_BITS 18
58
59 typedef struct {
60 AVIOContext *pb_filesystem; /** file system (AVFormatContext->pb) */
61
62 int sector_bits; /** sector shift bits; used to convert sector number into pb_filesystem offset */
63 uint32_t *sectors; /** file allocation table */
64 int nb_sectors; /** number of sectors */
65
66 int error;
67 int64_t position;
68 int64_t length;
69 } WtvFile;
70
71 /**
72 * @return bytes read, 0 on end of file, or <0 on error
73 */
74 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
75 {
76 WtvFile *wf = opaque;
77 AVIOContext *pb = wf->pb_filesystem;
78 int nread = 0;
79
80 if (wf->error || pb->error)
81 return -1;
82 if (wf->position >= wf->length || pb->eof_reached)
83 return 0;
84
85 buf_size = FFMIN(buf_size, wf->length - wf->position);
86 while(nread < buf_size) {
87 int n;
88 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
89 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
90
91 n = avio_read(pb, buf, read_request);
92 if (n <= 0)
93 break;
94 nread += n;
95 buf += n;
96 wf->position += n;
97 if (n == remaining_in_sector) {
98 int i = wf->position >> wf->sector_bits;
99 if (i >= wf->nb_sectors ||
100 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
101 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
102 wf->error = 1;
103 break;
104 }
105 }
106 }
107 return nread;
108 }
109
110 /**
111 * @return position (or file length)
112 */
113 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
114 {
115 WtvFile *wf = opaque;
116 AVIOContext *pb = wf->pb_filesystem;
117
118 if (whence == AVSEEK_SIZE)
119 return wf->length;
120 else if (whence == SEEK_CUR)
121 offset = wf->position + offset;
122 else if (whence == SEEK_END)
123 offset = wf->length;
124
125 wf->error = offset < 0 || offset >= wf->length ||
126 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
127 + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
128 wf->position = offset;
129 return offset;
130 }
131
132 /**
133 * read non-zero integers (le32) from input stream
134 * @param pb
135 * @param[out] data destination
136 * @param count maximum number of integers to read
137 * @return total number of integers read
138 */
139 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
140 {
141 int i, total = 0;
142 for (i = 0; i < count; i++) {
143 if ((data[total] = avio_rl32(pb)))
144 total++;
145 }
146 return total;
147 }
148
149 /**
150 * Open file
151 * @param first_sector First sector
152 * @param length Length of file (bytes)
153 * @param depth File allocation table depth
154 * @return NULL on error
155 */
156 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
157 {
158 AVIOContext *pb;
159 WtvFile *wf;
160 uint8_t *buffer;
161
162 if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
163 return NULL;
164
165 wf = av_mallocz(sizeof(WtvFile));
166 if (!wf)
167 return NULL;
168
169 if (depth == 0) {
170 wf->sectors = av_malloc(sizeof(uint32_t));
171 if (!wf->sectors) {
172 av_free(wf);
173 return NULL;
174 }
175 wf->sectors[0] = first_sector;
176 wf->nb_sectors = 1;
177 wf->sector_bits = WTV_SECTOR_BITS;
178 } else if (depth == 1) {
179 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
180 if (!wf->sectors) {
181 av_free(wf);
182 return NULL;
183 }
184 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
185 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
186 } else if (depth == 2) {
187 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
188 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
189 int i;
190
191 wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
192 if (!wf->sectors) {
193 av_free(wf);
194 return NULL;
195 }
196 wf->nb_sectors = 0;
197 for (i = 0; i < nb_sectors1; i++) {
198 if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
199 break;
200 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
201 }
202 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
203 } else {
204 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
205 av_free(wf);
206 return NULL;
207 }
208
209 if (!wf->nb_sectors) {
210 av_free(wf->sectors);
211 av_free(wf);
212 return NULL;
213 }
214
215 /* check length */
216 length &= 0xFFFFFFFFFFFF;
217 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
218 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);
219 length = (int64_t)wf->nb_sectors << wf->sector_bits;
220 }
221 wf->length = length;
222
223 /* seek to intial sector */
224 wf->position = 0;
225 if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
226 av_free(wf->sectors);
227 av_free(wf);
228 return NULL;
229 }
230
231 wf->pb_filesystem = s->pb;
232 buffer = av_malloc(1 << wf->sector_bits);
233 if (!buffer) {
234 av_free(wf->sectors);
235 av_free(wf);
236 return NULL;
237 }
238
239 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
240 wtvfile_read_packet, NULL, wtvfile_seek);
241 if (!pb) {
242 av_free(buffer);
243 av_free(wf->sectors);
244 av_free(wf);
245 }
246 return pb;
247 }
248
249 static const ff_asf_guid dir_entry_guid =
250 {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
251
252 /**
253 * Open file using filename
254 * @param[in] buf directory buffer
255 * @param buf_size directory buffer size
256 * @param[in] filename
257 * @param filename_size size of filename
258 * @return NULL on error
259 */
260 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
261 {
262 const uint8_t *buf_end = buf + buf_size;
263
264 while(buf + 48 <= buf_end) {
265 int dir_length, name_size, first_sector, depth;
266 uint64_t file_length;
267 const uint8_t *name;
268 if (ff_guidcmp(buf, dir_entry_guid)) {
269 av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
270 "remaining directory entries ignored\n", ARG_GUID(buf));
271 break;
272 }
273 dir_length = AV_RL16(buf + 16);
274 file_length = AV_RL64(buf + 24);
275 name_size = 2 * AV_RL32(buf + 32);
276 if (buf + 48 + name_size > buf_end) {
277 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
278 break;
279 }
280 first_sector = AV_RL32(buf + 40 + name_size);
281 depth = AV_RL32(buf + 44 + name_size);
282
283 /* compare file name; test optional null terminator */
284 name = buf + 40;
285 if (name_size >= filename_size &&
286 !memcmp(name, filename, filename_size) &&
287 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
288 return wtvfile_open_sector(first_sector, file_length, depth, s);
289
290 buf += dir_length;
291 }
292 return 0;
293 }
294
295 #define wtvfile_open(s, buf, buf_size, filename) \
296 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
297
298 /**
299 * Close file opened with wtvfile_open_sector(), or wtv_open()
300 */
301 static void wtvfile_close(AVIOContext *pb)
302 {
303 WtvFile *wf = pb->opaque;
304 av_free(wf->sectors);
305 av_free(pb);
306 }
307
308 /*
309 *
310 * Main demuxer
311 *
312 */
313
314 typedef struct {
315 int seen_data;
316 } WtvStream;
317
318 typedef struct {
319 AVIOContext *pb; /** timeline file */
320 int64_t epoch;
321 int64_t pts; /** pts for next data chunk */
322 int64_t last_valid_pts; /** latest valid pts, used for interative seeking */
323
324 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
325 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
326 AVIndexEntry *index_entries;
327 int nb_index_entries;
328 unsigned int index_entries_allocated_size;
329 } WtvContext;
330
331 typedef struct {
332 enum CodecID id;
333 ff_asf_guid guid;
334 } AVCodecGuid;
335
336 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
337 {
338 int i;
339 for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
340 if (!ff_guidcmp(guids[i].guid, guid))
341 return guids[i].id;
342 }
343 return CODEC_ID_NONE;
344 }
345
346 /* WTV GUIDs */
347 static const ff_asf_guid wtv_guid =
348 {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
349 static const ff_asf_guid metadata_guid =
350 {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
351 static const ff_asf_guid timestamp_guid =
352 {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
353 static const ff_asf_guid data_guid =
354 {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
355 static const ff_asf_guid stream_guid =
356 {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
357 static const ff_asf_guid stream2_guid =
358 {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
359 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
360 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
361 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
362 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
363 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
364 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
365 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
366 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
367 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
368 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
369 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
370 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
371 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
372 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
373 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
374 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
375 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
376 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
377
378 /* Windows media GUIDs */
379
380 #define MEDIASUBTYPE_BASE_GUID \
381 0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
382
383 /* Media types */
384 static const ff_asf_guid mediatype_audio =
385 {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
386 static const ff_asf_guid mediatype_video =
387 {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
388 static const ff_asf_guid mediasubtype_mpeg1payload =
389 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
390 static const ff_asf_guid mediatype_mpeg2_sections =
391 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
392 static const ff_asf_guid mediatype_mpeg2_pes =
393 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
394 static const ff_asf_guid mediatype_mstvcaption =
395 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
396
397 /* Media subtypes */
398 static const ff_asf_guid mediasubtype_cpfilters_processed =
399 {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
400 static const ff_asf_guid mediasubtype_dvb_subtitle =
401 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
402 static const ff_asf_guid mediasubtype_teletext =
403 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
404 static const ff_asf_guid mediasubtype_dtvccdata =
405 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
406 static const ff_asf_guid mediasubtype_mpeg2_sections =
407 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
408
409 /* Formats */
410 static const ff_asf_guid format_cpfilters_processed =
411 {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
412 static const ff_asf_guid format_waveformatex =
413 {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
414 static const ff_asf_guid format_videoinfo2 =
415 {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
416 static const ff_asf_guid format_mpeg2_video =
417 {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
418 static const ff_asf_guid format_none =
419 {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
420
421 static const AVCodecGuid video_guids[] = {
422 {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
423 {CODEC_ID_NONE}
424 };
425
426 static const AVCodecGuid audio_guids[] = {
427 {CODEC_ID_AC3, {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
428 {CODEC_ID_EAC3, {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
429 {CODEC_ID_MP2, {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
430 {CODEC_ID_NONE}
431 };
432
433 static int read_probe(AVProbeData *p)
434 {
435 return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
436 }
437
438 /**
439 * Convert win32 FILETIME to ISO-8601 string
440 */
441 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
442 {
443 time_t t = (value / 10000000LL) - 11644473600LL;
444 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
445 }
446
447 /**
448 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
449 */
450 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
451 {
452 time_t t = (value / 10000000LL) - 719162LL*86400LL;
453 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
454 }
455
456 /**
457 * Convert OLE DATE to ISO-8601 string
458 */
459 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
460 {
461 time_t t = 631112400LL + 86400*av_int2dbl(value);
462 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
463 }
464
465 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
466 {
467 char mime[1024];
468 char description[1024];
469 unsigned int filesize;
470 AVStream *st;
471 int64_t pos = avio_tell(pb);
472
473 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
474 if (strcmp(mime, "image/jpeg"))
475 goto done;
476
477 avio_r8(pb);
478 avio_get_str16le(pb, INT_MAX, description, sizeof(description));
479 filesize = avio_rl32(pb);
480 if (!filesize)
481 goto done;
482
483 st = av_new_stream(s, 0);
484 if (!st)
485 goto done;
486 av_metadata_set2(&st->metadata, "title", description, 0);
487 st->codec->codec_id = CODEC_ID_MJPEG;
488 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
489 st->codec->extradata = av_mallocz(filesize);
490 if (!st->codec->extradata)
491 goto done;
492 st->codec->extradata_size = filesize;
493 avio_read(pb, st->codec->extradata, filesize);
494 done:
495 avio_seek(pb, pos + length, SEEK_SET);
496 }
497
498 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
499 {
500 int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
501 char *buf = av_malloc(buf_size);
502 if (!buf)
503 return;
504
505 if (type == 0 && length == 4) {
506 snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
507 } else if (type == 1) {
508 avio_get_str16le(pb, length, buf, buf_size);
509 if (!strlen(buf)) {
510 av_free(buf);
511 return;
512 }
513 } else if (type == 3 && length == 4) {
514 strcpy(buf, avio_rl32(pb) ? "true" : "false");
515 } else if (type == 4 && length == 8) {
516 int64_t num = avio_rl64(pb);
517 if (!strcmp(key, "WM/EncodingTime") ||
518 !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
519 filetime_to_iso8601(buf, buf_size, num);
520 else if (!strcmp(key, "WM/WMRVEncodeTime") ||
521 !strcmp(key, "WM/WMRVEndTime"))
522 crazytime_to_iso8601(buf, buf_size, num);
523 else if (!strcmp(key, "WM/WMRVExpirationDate"))
524 oledate_to_iso8601(buf, buf_size, num);
525 else if (!strcmp(key, "WM/WMRVBitrate"))
526 snprintf(buf, buf_size, "%f", av_int2dbl(num));
527 else
528 snprintf(buf, buf_size, "%"PRIi64, num);
529 } else if (type == 5 && length == 2) {
530 snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
531 } else if (type == 6 && length == 16) {
532 ff_asf_guid guid;
533 avio_read(pb, guid, 16);
534 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
535 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
536 get_attachment(s, pb, length);
537 av_freep(&buf);
538 return;
539 } else {
540 av_freep(&buf);
541 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
542 avio_skip(pb, length);
543 return;
544 }
545
546 av_metadata_set2(&s->metadata, key, buf, 0);
547 av_freep(&buf);
548 }
549
550 /**
551 * Parse metadata entries
552 */
553 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
554 {
555 ff_asf_guid guid;
556 int length, type;
557 while(!pb->eof_reached) {
558 char key[1024];
559 ff_get_guid(pb, &guid);
560 type = avio_rl32(pb);
561 length = avio_rl32(pb);
562 if (!length)
563 break;
564 if (ff_guidcmp(&guid, metadata_guid)) {
565 av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
566 "remaining metadata entries ignored\n", ARG_GUID(guid));
567 break;
568 }
569 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
570 get_tag(s, pb, key, type, length);
571 }
572
573 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
574 }
575
576 /**
577 * parse VIDEOINFOHEADER2 structure
578 * @return bytes consumed
579 */
580 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
581 {
582 WtvContext *wtv = s->priv_data;
583 AVIOContext *pb = wtv->pb;
584
585 avio_skip(pb, 72); // picture aspect ratio is unreliable
586 ff_get_bmp_header(pb, st);
587
588 return 72 + 40;
589 }
590
591 /**
592 * Parse MPEG1WAVEFORMATEX extradata structure
593 */
594 static void parse_mpeg1waveformatex(AVStream *st)
595 {
596 /* fwHeadLayer */
597 switch (AV_RL16(st->codec->extradata)) {
598 case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
599 case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
600 case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
601 }
602
603 st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
604
605 /* dwHeadMode */
606 switch (AV_RL16(st->codec->extradata + 6)) {
607 case 1 : case 2 : case 4 : st->codec->channels = 2; break;
608 case 8 : st->codec->channels = 1; break;
609 }
610 }
611
612 /**
613 * Initialise stream
614 * @param st Stream to initialise, or NULL to create and initialise new stream
615 * @return NULL on error
616 */
617 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
618 {
619 if (st) {
620 if (st->codec->extradata) {
621 av_freep(&st->codec->extradata);
622 st->codec->extradata_size = 0;
623 }
624 } else {
625 WtvStream *wst = av_mallocz(sizeof(WtvStream));
626 if (!wst)
627 return NULL;
628 st = av_new_stream(s, sid);
629 if (!st)
630 return NULL;
631 st->priv_data = wst;
632 }
633 st->codec->codec_type = codec_type;
634 st->need_parsing = AVSTREAM_PARSE_FULL;
635 av_set_pts_info(st, 64, 1, 10000000);
636 return st;
637 }
638
639 /**
640 * parse Media Type structure and populate stream
641 * @param st Stream, or NULL to create new stream
642 * @param mediatype Mediatype GUID
643 * @param subtype Subtype GUID
644 * @param formattype Format GUID
645 * @param size Size of format buffer
646 * @return NULL on error
647 */
648 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
649 ff_asf_guid mediatype, ff_asf_guid subtype,
650 ff_asf_guid formattype, int size)
651 {
652 WtvContext *wtv = s->priv_data;
653 AVIOContext *pb = wtv->pb;
654 if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
655 !ff_guidcmp(formattype, format_cpfilters_processed)) {
656 ff_asf_guid actual_subtype;
657 ff_asf_guid actual_formattype;
658
659 if (size < 32) {
660 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
661 avio_skip(pb, size);
662 return NULL;
663 }
664
665 avio_skip(pb, size - 32);
666 ff_get_guid(pb, &actual_subtype);
667 ff_get_guid(pb, &actual_formattype);
668 avio_seek(pb, -size, SEEK_CUR);
669
670 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
671 avio_skip(pb, 32);
672 return st;
673 } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
674 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
675 if (!st)
676 return NULL;
677 if (!ff_guidcmp(formattype, format_waveformatex)) {
678 int ret = ff_get_wav_header(pb, st->codec, size);
679 if (ret < 0)
680 return NULL;
681 } else {
682 if (ff_guidcmp(formattype, format_none))
683 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
684 avio_skip(pb, size);
685 }
686
687 if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
688 st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
689 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
690 if (st->codec->extradata && st->codec->extradata_size >= 22)
691 parse_mpeg1waveformatex(st);
692 else
693 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
694 } else {
695 st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
696 if (st->codec->codec_id == CODEC_ID_NONE)
697 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
698 }
699 return st;
700 } else if (!ff_guidcmp(mediatype, mediatype_video)) {
701 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
702 if (!st)
703 return NULL;
704 if (!ff_guidcmp(formattype, format_videoinfo2)) {
705 int consumed = parse_videoinfoheader2(s, st);
706 avio_skip(pb, FFMAX(size - consumed, 0));
707 } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
708 int consumed = parse_videoinfoheader2(s, st);
709 avio_skip(pb, FFMAX(size - consumed, 0));
710 } else {
711 if (ff_guidcmp(formattype, format_none))
712 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
713 avio_skip(pb, size);
714 }
715
716 if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
717 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
718 } else {
719 st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
720 }
721 if (st->codec->codec_id == CODEC_ID_NONE)
722 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
723 return st;
724 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
725 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
726 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
727 if (!st)
728 return NULL;
729 if (ff_guidcmp(formattype, format_none))
730 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
731 avio_skip(pb, size);
732 st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
733 return st;
734 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
735 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
736 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
737 if (!st)
738 return NULL;
739 if (ff_guidcmp(formattype, format_none))
740 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
741 avio_skip(pb, size);
742 st->codec->codec_id = CODEC_ID_DVB_TELETEXT;
743 return st;
744 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
745 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
746 if (ff_guidcmp(formattype, format_none))
747 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
748 avio_skip(pb, size);
749 return NULL;
750 }
751
752 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
753 ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
754 ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
755 avio_skip(pb, size);
756 return NULL;
757 }
758
759 enum {
760 SEEK_TO_DATA = 0,
761 SEEK_TO_PTS,
762 };
763
764 /**
765 * Parse WTV chunks
766 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
767 * @param seekts timestamp
768 * @param[out] len Length of data chunk
769 * @return stream index of data chunk, or <0 on error
770 */
771 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
772 {
773 WtvContext *wtv = s->priv_data;
774 AVIOContext *pb = wtv->pb;
775 while (!pb->eof_reached) {
776 ff_asf_guid g;
777 int len, sid, consumed;
778
779 ff_get_guid(pb, &g);
780 len = avio_rl32(pb);
781 if (len < 32)
782 break;
783 sid = avio_rl32(pb) & 0x7FFF;
784 avio_skip(pb, 8);
785 consumed = 32;
786
787 if (!ff_guidcmp(g, stream_guid)) {
788 if (ff_find_stream_index(s, sid) < 0) {
789 ff_asf_guid mediatype, subtype, formattype;
790 int size;
791 avio_skip(pb, 28);
792 ff_get_guid(pb, &mediatype);
793 ff_get_guid(pb, &subtype);
794 avio_skip(pb, 12);
795 ff_get_guid(pb, &formattype);
796 size = avio_rl32(pb);
797 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
798 consumed += 92 + size;
799 }
800 } else if (!ff_guidcmp(g, stream2_guid)) {
801 int stream_index = ff_find_stream_index(s, sid);
802 if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
803 ff_asf_guid mediatype, subtype, formattype;
804 int size;
805 avio_skip(pb, 12);
806 ff_get_guid(pb, &mediatype);
807 ff_get_guid(pb, &subtype);
808 avio_skip(pb, 12);
809 ff_get_guid(pb, &formattype);
810 size = avio_rl32(pb);
811 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
812 consumed += 76 + size;
813 }
814 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
815 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
816 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
817 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
818 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
819 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
820 int stream_index = ff_find_stream_index(s, sid);
821 if (stream_index >= 0) {
822 AVStream *st = s->streams[stream_index];
823 uint8_t buf[258];
824 const uint8_t *pbuf = buf;
825 int buf_size;
826
827 avio_skip(pb, 8);
828 consumed += 8;
829 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
830 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
831 avio_skip(pb, 6);
832 consumed += 6;
833 }
834
835 buf_size = FFMIN(len - consumed, sizeof(buf));
836 avio_read(pb, buf, buf_size);
837 consumed += buf_size;
838 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
839 }
840 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
841 int stream_index = ff_find_stream_index(s, sid);
842 if (stream_index >= 0) {
843 AVStream *st = s->streams[stream_index];
844 int audio_type;
845 avio_skip(pb, 8);
846 audio_type = avio_r8(pb);
847 if (audio_type == 2)
848 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
849 else if (audio_type == 3)
850 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
851 consumed += 9;
852 }
853 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
854 int stream_index = ff_find_stream_index(s, sid);
855 if (stream_index >= 0) {
856 avio_skip(pb, 12);
857 if (avio_rl32(pb))
858 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
859 consumed += 16;
860 }
861 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
862 int stream_index = ff_find_stream_index(s, sid);
863 if (stream_index >= 0) {
864 AVStream *st = s->streams[stream_index];
865 uint8_t language[4];
866 avio_skip(pb, 12);
867 avio_read(pb, language, 3);
868 if (language[0]) {
869 language[3] = 0;
870 av_metadata_set2(&st->metadata, "language", language, 0);
871 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
872 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
873 }
874 consumed += 15;
875 }
876 } else if (!ff_guidcmp(g, timestamp_guid)) {
877 int stream_index = ff_find_stream_index(s, sid);
878 if (stream_index >= 0) {
879 avio_skip(pb, 8);
880 wtv->pts = avio_rl64(pb);
881 consumed += 16;
882 if (wtv->pts == -1)
883 wtv->pts = AV_NOPTS_VALUE;
884 else {
885 wtv->last_valid_pts = wtv->pts;
886 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
887 wtv->epoch = wtv->pts;
888 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
889 #define WTV_PAD8(x) (((x) + 7) & ~7)
890 avio_skip(pb, WTV_PAD8(len) - consumed);
891 return 0;
892 }
893 }
894 }
895 } else if (!ff_guidcmp(g, data_guid)) {
896 int stream_index = ff_find_stream_index(s, sid);
897 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
898 WtvStream *wst = s->streams[stream_index]->priv_data;
899 wst->seen_data = 1;
900 if (len_ptr) {
901 *len_ptr = len;
902 }
903 return stream_index;
904 }
905 } else if (
906 !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}) ||
907 !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}) ||
908 !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}) ||
909 !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}) ||
910 !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}) ||
911 !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}) ||
912 !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}) ||
913 !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}) ||
914 !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}) ||
915 !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}) ||
916 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
917 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
918 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
919 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
920 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
921 !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
922 !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
923 !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
924 //ignore known guids
925 } else
926 av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
927
928 avio_skip(pb, WTV_PAD8(len) - consumed);
929 }
930 return AVERROR_EOF;
931 }
932
933 /* declare utf16le strings */
934 #define _ , 0,
935 static const uint8_t timeline_le16[] =
936 {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
937 static const uint8_t table_0_entries_legacy_attrib_le16[] =
938 {'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};
939 static const uint8_t table_0_entries_time_le16[] =
940 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
941 static const uint8_t timeline_table_0_entries_Events_le16[] =
942 {'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};
943 #undef _
944
945 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
946 {
947 WtvContext *wtv = s->priv_data;
948 int root_sector, root_size;
949 uint8_t root[WTV_SECTOR_SIZE];
950 AVIOContext *pb;
951 int64_t timeline_pos;
952 int ret;
953
954 wtv->epoch =
955 wtv->pts =
956 wtv->last_valid_pts = AV_NOPTS_VALUE;
957
958 /* read root directory sector */
959 avio_skip(s->pb, 0x30);
960 root_size = avio_rl32(s->pb);
961 if (root_size > sizeof(root)) {
962 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
963 return AVERROR_INVALIDDATA;
964 }
965 avio_skip(s->pb, 4);
966 root_sector = avio_rl32(s->pb);
967
968 avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
969 root_size = avio_read(s->pb, root, root_size);
970 if (root_size < 0)
971 return AVERROR_INVALIDDATA;
972
973 /* parse chunks up until first data chunk */
974 wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
975 if (!wtv->pb) {
976 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
977 return AVERROR_INVALIDDATA;
978 }
979
980 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
981 if (ret < 0)
982 return ret;
983 avio_seek(wtv->pb, -32, SEEK_CUR);
984
985 timeline_pos = avio_tell(s->pb); // save before opening another file
986
987 /* read metadata */
988 pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
989 if (pb) {
990 parse_legacy_attrib(s, pb);
991 wtvfile_close(pb);
992 }
993
994 /* read seek index */
995 if (s->nb_streams) {
996 AVStream *st = s->streams[0];
997 pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
998 if (pb) {
999 while(1) {
1000 uint64_t timestamp = avio_rl64(pb);
1001 uint64_t frame_nb = avio_rl64(pb);
1002 if (pb->eof_reached)
1003 break;
1004 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1005 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1006 }
1007 wtvfile_close(pb);
1008
1009 if (wtv->nb_index_entries) {
1010 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1011 if (pb) {
1012 int i;
1013 while (1) {
1014 uint64_t frame_nb = avio_rl64(pb);
1015 uint64_t position = avio_rl64(pb);
1016 if (pb->eof_reached)
1017 break;
1018 for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1019 AVIndexEntry *e = wtv->index_entries + i;
1020 if (frame_nb > e->size)
1021 break;
1022 if (position > e->pos)
1023 e->pos = position;
1024 }
1025 }
1026 wtvfile_close(pb);
1027 st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1028 }
1029 }
1030 }
1031 }
1032
1033 avio_seek(s->pb, timeline_pos, SEEK_SET);
1034 return 0;
1035 }
1036
1037 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1038 {
1039 WtvContext *wtv = s->priv_data;
1040 AVIOContext *pb = wtv->pb;
1041 int stream_index, len, ret;
1042
1043 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1044 if (stream_index < 0)
1045 return stream_index;
1046
1047 ret = av_get_packet(pb, pkt, len - 32);
1048 if (ret < 0)
1049 return ret;
1050 pkt->stream_index = stream_index;
1051 pkt->pts = wtv->pts;
1052 avio_skip(pb, WTV_PAD8(len) - len);
1053 return 0;
1054 }
1055
1056 static int read_seek(AVFormatContext *s, int stream_index,
1057 int64_t ts, int flags)
1058 {
1059 WtvContext *wtv = s->priv_data;
1060 AVIOContext *pb = wtv->pb;
1061 AVStream *st = s->streams[0];
1062 int64_t ts_relative;
1063 int i;
1064
1065 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1066 return AVERROR(ENOSYS);
1067
1068 /* timestamp adjustment is required because wtv->pts values are absolute,
1069 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1070 ts_relative = ts;
1071 if (wtv->epoch != AV_NOPTS_VALUE)
1072 ts_relative -= wtv->epoch;
1073
1074 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1075 if (i < 0) {
1076 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1077 avio_seek(pb, 0, SEEK_SET);
1078 else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1079 avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1080 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1081 return AVERROR(ERANGE);
1082 return 0;
1083 }
1084 wtv->pts = wtv->index_entries[i].timestamp;
1085 if (wtv->epoch != AV_NOPTS_VALUE)
1086 wtv->pts += wtv->epoch;
1087 wtv->last_valid_pts = wtv->pts;
1088 avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1089 return 0;
1090 }
1091
1092 static int read_close(AVFormatContext *s)
1093 {
1094 WtvContext *wtv = s->priv_data;
1095 wtvfile_close(wtv->pb);
1096 return 0;
1097 }
1098
1099 AVInputFormat ff_wtv_demuxer = {
1100 .name = "wtv",
1101 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1102 .priv_data_size = sizeof(WtvContext),
1103 .read_probe = read_probe,
1104 .read_header = read_header,
1105 .read_packet = read_packet,
1106 .read_seek = read_seek,
1107 .read_close = read_close,
1108 .flags = AVFMT_SHOW_IDS,
1109 };