FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/wtvdec.c
Date: 2026-08-30 18:45:47
Exec Total Coverage
Lines: 460 625 73.6%
Functions: 21 23 91.3%
Branches: 272 451 60.3%
Line Branch Exec Source
1 /*
2 * Windows Television (WTV) demuxer
3 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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/mem.h"
34 #include "avformat.h"
35 #include "avio_internal.h"
36 #include "demux.h"
37 #include "internal.h"
38 #include "wtv.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 35
47
48 /*
49 * File system routines
50 */
51
52 typedef struct WtvFile {
53 AVIOContext *pb_filesystem; /**< file system (AVFormatContext->pb) */
54
55 int sector_bits; /**< sector shift bits; used to convert sector number into pb_filesystem offset */
56 uint32_t *sectors; /**< file allocation table */
57 int nb_sectors; /**< number of sectors */
58
59 int error;
60 int64_t position;
61 int64_t length;
62 } WtvFile;
63
64 51 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
65 {
66 51 return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET);
67 }
68
69 /**
70 * @return bytes read, AVERROR_EOF on end of file, or <0 on error
71 */
72 342 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
73 {
74 342 WtvFile *wf = opaque;
75 342 AVIOContext *pb = wf->pb_filesystem;
76 342 int nread = 0, n = 0;
77
78
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 342 if (wf->error || pb->error)
79 ✗ return -1;
80
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 342 if (wf->position >= wf->length || avio_feof(pb))
81 50 return AVERROR_EOF;
82
83 292 buf_size = FFMIN(buf_size, wf->length - wf->position);
84
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 974 while(nread < buf_size) {
85 683 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
86 683 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
87
88 683 n = avio_read(pb, buf, read_request);
89
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 683 if (n <= 0)
90 1 break;
91 682 nread += n;
92 682 buf += n;
93 682 wf->position += n;
94
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 682 if (n == remaining_in_sector) {
95 424 int i = wf->position >> wf->sector_bits;
96
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 424 if (i >= wf->nb_sectors ||
97
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 426 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
98 2 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
99 ✗ wf->error = 1;
100 ✗ break;
101 }
102 }
103 }
104
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 292 return nread ? nread : n;
105 }
106
107 /**
108 * @return position (or file length)
109 */
110 22 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
111 {
112 22 WtvFile *wf = opaque;
113 22 AVIOContext *pb = wf->pb_filesystem;
114
115
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 22 if (whence == AVSEEK_SIZE)
116 ✗ return wf->length;
117
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 22 else if (whence == SEEK_CUR)
118 ✗ offset = wf->position + offset;
119
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 22 else if (whence == SEEK_END)
120 ✗ offset = wf->length;
121
122
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 44 wf->error = offset < 0 || offset >= wf->length ||
123 22 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
124 22 offset & ((1 << wf->sector_bits) - 1)) < 0;
125 22 wf->position = offset;
126 22 return offset;
127 }
128
129 /**
130 * read non-zero integers (le32) from input stream
131 * @param pb
132 * @param[out] data destination
133 * @param count maximum number of integers to read
134 * @return total number of integers read
135 */
136 5 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
137 {
138 5 int i, total = 0;
139
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 5125 for (i = 0; i < count; i++) {
140
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 5120 if ((data[total] = avio_rl32(pb)))
141 411 total++;
142 }
143 5 return total;
144 }
145
146 /**
147 * Open file
148 * @param first_sector First sector
149 * @param length Length of file (bytes)
150 * @param depth File allocation table depth
151 * @return NULL on error
152 */
153 12 static AVIOContext * wtvfile_open_sector(unsigned first_sector, uint64_t length, int depth, AVFormatContext *s)
154 {
155 AVIOContext *pb;
156 WtvFile *wf;
157 uint8_t *buffer;
158 int64_t size;
159
160
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 12 if (seek_by_sector(s->pb, first_sector, 0) < 0)
161 ✗ return NULL;
162
163 12 wf = av_mallocz(sizeof(WtvFile));
164
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 12 if (!wf)
165 ✗ return NULL;
166
167
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 12 if (depth == 0) {
168 7 wf->sectors = av_malloc(sizeof(uint32_t));
169
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 7 if (!wf->sectors) {
170 ✗ av_free(wf);
171 ✗ return NULL;
172 }
173 7 wf->sectors[0] = first_sector;
174 7 wf->nb_sectors = 1;
175
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 5 } else if (depth == 1) {
176 5 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
177
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 5 if (!wf->sectors) {
178 ✗ av_free(wf);
179 ✗ return NULL;
180 }
181 5 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
182 ✗ } else if (depth == 2) {
183 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
184 ✗ int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
185 int i;
186
187 ✗ wf->sectors = av_calloc(nb_sectors1, 1 << WTV_SECTOR_BITS);
188 ✗ if (!wf->sectors) {
189 ✗ av_free(wf);
190 ✗ return NULL;
191 }
192 ✗ wf->nb_sectors = 0;
193 ✗ for (i = 0; i < nb_sectors1; i++) {
194 ✗ if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
195 ✗ break;
196 ✗ wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
197 }
198 } else {
199 ✗ av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
200 ✗ av_free(wf);
201 ✗ return NULL;
202 }
203
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 12 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
204
205
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 12 if (!wf->nb_sectors) {
206 ✗ av_freep(&wf->sectors);
207 ✗ av_freep(&wf);
208 ✗ return NULL;
209 }
210
211 12 size = avio_size(s->pb);
212
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 12 if (size >= 0 && (int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > size)
213 1 av_log(s, AV_LOG_WARNING, "truncated file\n");
214
215 /* check length */
216 12 length &= 0xFFFFFFFFFFFF;
217
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 12 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 12 wf->length = length;
222
223 /* seek to initial sector */
224 12 wf->position = 0;
225
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 12 if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
226 ✗ av_freep(&wf->sectors);
227 ✗ av_freep(&wf);
228 ✗ return NULL;
229 }
230
231 12 wf->pb_filesystem = s->pb;
232 12 buffer = av_malloc(1 << wf->sector_bits);
233
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 12 if (!buffer) {
234 ✗ av_freep(&wf->sectors);
235 ✗ av_freep(&wf);
236 ✗ return NULL;
237 }
238
239 12 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
240 wtvfile_read_packet, NULL, wtvfile_seek);
241
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 12 if (!pb) {
242 ✗ av_freep(&buffer);
243 ✗ av_freep(&wf->sectors);
244 ✗ av_freep(&wf);
245 }
246 12 return pb;
247 }
248
249 /**
250 * Open file using filename
251 * @param[in] buf directory buffer
252 * @param buf_size directory buffer size
253 * @param[in] filename
254 * @param filename_size size of filename
255 * @return NULL on error
256 */
257 12 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
258 {
259 12 const uint8_t *buf_end = buf + buf_size;
260
261
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 54 while(buf + 48 <= buf_end) {
262 int dir_length, name_size, first_sector, depth;
263 uint64_t file_length;
264 const uint8_t *name;
265
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 54 if (ff_guidcmp(buf, ff_dir_entry_guid)) {
266 ✗ av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
267 ✗ "remaining directory entries ignored\n", FF_ARG_GUID(buf));
268 ✗ break;
269 }
270 54 dir_length = AV_RL16(buf + 16);
271 54 file_length = AV_RL64(buf + 24);
272 54 name_size = 2 * AV_RL32(buf + 32);
273
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 54 if (name_size < 0) {
274 ✗ av_log(s, AV_LOG_ERROR,
275 "bad filename length, remaining directory entries ignored\n");
276 ✗ break;
277 }
278
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 54 if (dir_length == 0) {
279 ✗ av_log(s, AV_LOG_ERROR,
280 "bad dir length, remaining directory entries ignored\n");
281 ✗ break;
282 }
283
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 54 if (48 + (int64_t)name_size > buf_end - buf) {
284 ✗ av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
285 ✗ break;
286 }
287 54 first_sector = AV_RL32(buf + 40 + name_size);
288 54 depth = AV_RL32(buf + 44 + name_size);
289
290 /* compare file name; test optional null terminator */
291 54 name = buf + 40;
292
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 54 if (name_size >= filename_size &&
293
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 45 !memcmp(name, filename, filename_size) &&
294
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 18 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
295 12 return wtvfile_open_sector(first_sector, file_length, depth, s);
296
297 42 buf += dir_length;
298 }
299 ✗ return NULL;
300 }
301
302 #define wtvfile_open(s, buf, buf_size, filename) \
303 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
304
305 /**
306 * Close file opened with wtvfile_open_sector(), or wtv_open()
307 */
308 12 static void wtvfile_close(AVIOContext *pb)
309 {
310 12 WtvFile *wf = pb->opaque;
311 12 av_freep(&wf->sectors);
312 12 av_freep(&pb->opaque);
313 12 av_freep(&pb->buffer);
314 12 avio_context_free(&pb);
315 12 }
316
317 /*
318 * Main demuxer
319 */
320
321 typedef struct WtvStream {
322 int seen_data;
323 } WtvStream;
324
325 typedef struct WtvContext {
326 AVIOContext *pb; /**< timeline file */
327 int64_t epoch;
328 int64_t pts; /**< pts for next data chunk */
329 int64_t last_valid_pts; /**< latest valid pts, used for interactive seeking */
330
331 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
332 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
333 AVIndexEntry *index_entries;
334 int nb_index_entries;
335 unsigned int index_entries_allocated_size;
336 } WtvContext;
337
338 /* WTV GUIDs */
339 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
340 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
341 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
342 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
343 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
344 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
345 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
346 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
347 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
348 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
349 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
350 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
351 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
352 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
353 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
354 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
355 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
356 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
357
358 /* Windows media GUIDs */
359
360 /* Media types */
361 static const ff_asf_guid mediasubtype_mpeg1payload =
362 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
363 static const ff_asf_guid mediatype_mpeg2_sections =
364 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
365 static const ff_asf_guid mediatype_mpeg2_pes =
366 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
367 static const ff_asf_guid mediatype_mstvcaption =
368 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
369
370 /* Media subtypes */
371 static const ff_asf_guid mediasubtype_dvb_subtitle =
372 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
373 static const ff_asf_guid mediasubtype_teletext =
374 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
375 static const ff_asf_guid mediasubtype_dtvccdata =
376 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
377 static const ff_asf_guid mediasubtype_mpeg2_sections =
378 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
379
380 7957 static int read_probe(const AVProbeData *p)
381 {
382
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 7957 return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
383 }
384
385 /**
386 * Convert crazy time (100ns since 1 Jan 0001) to av time (unix timestamp in microseconds)
387 */
388 2 static int64_t crazytime_to_avtime(int64_t value)
389 {
390 2 return (value / 10LL) - 719162LL*86400000000LL;
391 }
392
393 /**
394 * Convert OLE DATE to av time (unix timestamp in microseconds)
395 */
396 1 static int64_t oledate_to_avtime(int64_t value)
397 {
398 1 return (av_int2double(value) - 25569.0) * 86400000000;
399 }
400
401 1 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
402 {
403 char mime[1024];
404 char description[1024];
405 unsigned int filesize;
406 AVStream *st;
407 1 int64_t pos = avio_tell(pb);
408
409 1 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
410
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 1 if (strcmp(mime, "image/jpeg"))
411 ✗ goto done;
412
413 1 avio_r8(pb);
414 1 avio_get_str16le(pb, INT_MAX, description, sizeof(description));
415 1 filesize = avio_rl32(pb);
416
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 1 if (!filesize)
417 ✗ goto done;
418
419
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 1 if (ff_add_attached_pic(s, NULL, pb, NULL, filesize) < 0)
420 ✗ goto done;
421 1 st = s->streams[s->nb_streams - 1];
422 1 av_dict_set(&st->metadata, "title", description, 0);
423 1 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
424 1 st->id = -1;
425 1 done:
426 1 avio_seek(pb, pos + length, SEEK_SET);
427 1 }
428
429 73 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
430 {
431 73 char buf[LEN_PRETTY_GUID + 1], *bufp = buf;
432 73 unsigned dict_flags = 0;
433
434
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 73 if (!strcmp(key, "WM/MediaThumbType")) {
435 1 avio_skip(pb, length);
436 11 return;
437 }
438
439
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 72 if (type == 0 && length == 4) {
440 23 snprintf(buf, sizeof(buf), "%u", avio_rl32(pb));
441
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 49 } else if (type == 1) {
442
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 23 int buflen = FFMIN(length + length / 2U + 1, INT_MAX);
443 23 bufp = av_malloc(buflen);
444
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 23 if (!bufp)
445 ✗ return;
446 23 avio_get_str16le(pb, length, bufp, buflen);
447
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 23 if (!*bufp) {
448 6 av_free(bufp);
449 6 return;
450 }
451 17 dict_flags = AV_DICT_DONT_STRDUP_VAL;
452
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 26 } else if (type == 3 && length == 4) {
453
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 17 strcpy(buf, avio_rl32(pb) ? "true" : "false");
454
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 12 } else if (type == 4 && length == 8) {
455 6 int64_t num = avio_rl64(pb);
456
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 6 if (!strcmp(key, "WM/EncodingTime") ||
457
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 6 !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
458 ✗ ff_dict_set_timestamp(&s->metadata, key, ff_asf_filetime_to_avtime(num));
459 ✗ return;
460
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 6 } else if (!strcmp(key, "WM/WMRVEncodeTime") ||
461
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 5 !strcmp(key, "WM/WMRVEndTime")) {
462 2 ff_dict_set_timestamp(&s->metadata, key, crazytime_to_avtime(num));
463 2 return;
464
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 4 } else if (!strcmp(key, "WM/WMRVExpirationDate")) {
465 1 ff_dict_set_timestamp(&s->metadata, key, oledate_to_avtime(num));
466 1 return;
467
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 3 } else if (!strcmp(key, "WM/WMRVBitrate"))
468 1 snprintf(buf, sizeof(buf), "%f", av_int2double(num));
469 else
470 2 snprintf(buf, sizeof(buf), "%"PRIi64, num);
471
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 3 } else if (type == 5 && length == 2) {
472 ✗ snprintf(buf, sizeof(buf), "%u", avio_rl16(pb));
473
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 3 } else if (type == 6 && length == 16) {
474 ff_asf_guid guid;
475 2 avio_read(pb, guid, 16);
476 2 snprintf(buf, sizeof(buf), PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
477
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 1 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
478 1 get_attachment(s, pb, length);
479 1 return;
480 } else {
481 ✗ av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
482 ✗ avio_skip(pb, length);
483 ✗ return;
484 }
485
486 62 av_dict_set(&s->metadata, key, bufp, dict_flags);
487 }
488
489 /**
490 * Parse metadata entries
491 */
492 3 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
493 {
494 ff_asf_guid guid;
495 int length, type;
496
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 76 while(!avio_feof(pb)) {
497 char key[1024];
498 76 ff_get_guid(pb, &guid);
499 76 type = avio_rl32(pb);
500 76 length = avio_rl32(pb);
501
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 76 if (length <= 0)
502 3 break;
503
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 73 if (ff_guidcmp(&guid, ff_metadata_guid)) {
504 ✗ av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
505 ✗ "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
506 ✗ break;
507 }
508 73 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
509 73 get_tag(s, pb, key, type, length);
510 }
511
512 3 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
513 3 }
514
515 /**
516 * parse VIDEOINFOHEADER2 structure
517 * @return bytes consumed
518 */
519 4 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
520 {
521 4 WtvContext *wtv = s->priv_data;
522 4 AVIOContext *pb = wtv->pb;
523
524 4 avio_skip(pb, 72); // picture aspect ratio is unreliable
525 4 st->codecpar->codec_tag = ff_get_bmp_header(pb, st, NULL);
526
527 4 return 72 + 40;
528 }
529
530 /**
531 * Parse MPEG1WAVEFORMATEX extradata structure
532 */
533 ✗ static void parse_mpeg1waveformatex(AVStream *st)
534 {
535 /* fwHeadLayer */
536 ✗ switch (AV_RL16(st->codecpar->extradata)) {
537 ✗ case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break;
538 ✗ case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
539 ✗ case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
540 }
541
542 ✗ st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */
543
544 /* dwHeadMode */
545 ✗ switch (AV_RL16(st->codecpar->extradata + 6)) {
546 ✗ case 1 :
547 case 2 :
548 ✗ case 4 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
549 ✗ break;
550 ✗ case 8 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
551 ✗ break;
552 }
553 ✗ }
554
555 /**
556 * Initialise stream
557 * @param st Stream to initialise, or NULL to create and initialise new stream
558 * @return NULL on error
559 */
560 12 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
561 {
562
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 12 if (st) {
563
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 4 if (st->codecpar->extradata) {
564 2 av_freep(&st->codecpar->extradata);
565 2 st->codecpar->extradata_size = 0;
566 }
567 } else {
568 8 WtvStream *wst = av_mallocz(sizeof(WtvStream));
569
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 8 if (!wst)
570 ✗ return NULL;
571 8 st = avformat_new_stream(s, NULL);
572
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 8 if (!st) {
573 ✗ av_free(wst);
574 ✗ return NULL;
575 }
576 8 st->id = sid;
577 8 st->priv_data = wst;
578 }
579 12 st->codecpar->codec_type = codec_type;
580 12 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
581 12 avpriv_set_pts_info(st, 64, 1, 10000000);
582 12 return st;
583 }
584
585 /**
586 * parse Media Type structure and populate stream
587 * @param st Stream, or NULL to create new stream
588 * @param mediatype Mediatype GUID
589 * @param subtype Subtype GUID
590 * @param formattype Format GUID
591 * @param size Size of format buffer
592 * @return NULL on error
593 */
594 22 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
595 ff_asf_guid mediatype, ff_asf_guid subtype,
596 ff_asf_guid formattype, uint64_t size)
597 {
598 22 WtvContext *wtv = s->priv_data;
599 22 AVIOContext *pb = wtv->pb;
600
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 32 if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) &&
601 10 !ff_guidcmp(formattype, ff_format_cpfilters_processed)) {
602 ff_asf_guid actual_subtype;
603 ff_asf_guid actual_formattype;
604
605
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 10 if (size < 32) {
606 ✗ av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
607 ✗ avio_skip(pb, size);
608 ✗ return NULL;
609 }
610
611 10 avio_skip(pb, size - 32);
612 10 ff_get_guid(pb, &actual_subtype);
613 10 ff_get_guid(pb, &actual_formattype);
614
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 10 if (avio_feof(pb))
615 ✗ return NULL;
616 10 avio_seek(pb, -size, SEEK_CUR);
617
618 10 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
619 10 avio_skip(pb, 32);
620 10 return st;
621
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 12 } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
622 6 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
623
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 6 if (!st)
624 ✗ return NULL;
625
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 6 if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
626 6 int ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
627
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 6 if (ret < 0)
628 ✗ return NULL;
629 } else {
630 ✗ if (ff_guidcmp(formattype, ff_format_none))
631 ✗ av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
632 ✗ avio_skip(pb, size);
633 }
634
635
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 6 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
636 ✗ st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample);
637
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 6 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
638 ✗ if (st->codecpar->extradata && st->codecpar->extradata_size >= 22)
639 ✗ parse_mpeg1waveformatex(st);
640 else
641 ✗ av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
642 } else {
643 6 st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
644
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 6 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
645 ✗ av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
646 }
647 6 return st;
648
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 6 } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
649 4 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
650
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 4 if (!st)
651 ✗ return NULL;
652
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 4 if (!ff_guidcmp(formattype, ff_format_videoinfo2)) {
653 ✗ int consumed = parse_videoinfoheader2(s, st);
654 ✗ avio_skip(pb, FFMAX(size - consumed, 0));
655
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 4 } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
656 4 uint64_t consumed = parse_videoinfoheader2(s, st);
657 /* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */
658 4 avio_skip(pb, FFMAX(size - consumed, 0));
659 } else {
660 ✗ if (ff_guidcmp(formattype, ff_format_none))
661 ✗ av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
662 ✗ avio_skip(pb, size);
663 }
664
665
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 4 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
666 ✗ st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
667 } else {
668 4 st->codecpar->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
669 }
670
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 4 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
671 ✗ av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
672 4 return st;
673
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 4 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
674 2 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
675 2 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
676
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 2 if (!st)
677 ✗ return NULL;
678
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 2 if (ff_guidcmp(formattype, ff_format_none))
679 ✗ av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
680 2 avio_skip(pb, size);
681 2 st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
682 2 return st;
683 ✗ } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
684 ✗ (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
685 ✗ st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
686 ✗ if (!st)
687 ✗ return NULL;
688 ✗ if (ff_guidcmp(formattype, ff_format_none))
689 ✗ av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
690 ✗ avio_skip(pb, size);
691 ✗ st->codecpar->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
692 ✗ return st;
693 ✗ } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
694 ✗ !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
695 ✗ if (ff_guidcmp(formattype, ff_format_none))
696 ✗ av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
697 ✗ avio_skip(pb, size);
698 ✗ return NULL;
699 }
700
701 ✗ av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
702 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
703 ✗ FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
704 ✗ avio_skip(pb, size);
705 ✗ return NULL;
706 }
707
708 enum {
709 SEEK_TO_DATA = 0,
710 SEEK_TO_PTS,
711 };
712
713 /**
714 * Try to seek over a broken chunk
715 * @return <0 on error
716 */
717 ✗ static int recover(WtvContext *wtv, uint64_t broken_pos)
718 {
719 ✗ AVIOContext *pb = wtv->pb;
720 int i;
721 ✗ for (i = 0; i < wtv->nb_index_entries; i++) {
722 ✗ if (wtv->index_entries[i].pos > broken_pos) {
723 ✗ int64_t ret = avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
724 ✗ if (ret < 0)
725 ✗ return ret;
726 ✗ wtv->pts = wtv->index_entries[i].timestamp;
727 ✗ return 0;
728 }
729 }
730 ✗ return AVERROR_INVALIDDATA;
731 }
732
733 /**
734 * Parse WTV chunks
735 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
736 * @param seekts timestamp
737 * @param[out] len_ptr Length of data chunk
738 * @return stream index of data chunk, or <0 on error
739 */
740 321 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
741 {
742 321 WtvContext *wtv = s->priv_data;
743 321 AVIOContext *pb = wtv->pb;
744 int ret;
745
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 1469 while (!avio_feof(pb)) {
746 ff_asf_guid g;
747 int len, sid, consumed;
748
749 1458 ff_get_guid(pb, &g);
750 1458 len = avio_rl32(pb);
751
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 1458 if (len < 32 || len > INT_MAX - 7) {
752 int ret;
753
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 7 if (avio_feof(pb))
754 310 return AVERROR_EOF;
755 ✗ av_log(s, AV_LOG_WARNING, "encountered broken chunk\n");
756 ✗ if ((ret = recover(wtv, avio_tell(pb) - 20)) < 0)
757 ✗ return ret;
758 ✗ continue;
759 }
760 1451 sid = avio_rl32(pb) & 0x7FFF;
761 1451 avio_skip(pb, 8);
762 1451 consumed = 32;
763
764
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 1451 if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) {
765
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 34 if (ff_find_stream_index(s, sid) < 0) {
766 ff_asf_guid mediatype, subtype, formattype;
767 int size;
768 8 avio_skip(pb, 28);
769 8 ff_get_guid(pb, &mediatype);
770 8 ff_get_guid(pb, &subtype);
771 8 avio_skip(pb, 12);
772 8 ff_get_guid(pb, &formattype);
773 8 size = avio_rl32(pb);
774
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 8 if (size < 0 || size > INT_MAX - 92 - consumed)
775 ✗ return AVERROR_INVALIDDATA;
776 8 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
777 8 consumed += 92 + size;
778 }
779
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 1417 } else if (!ff_guidcmp(g, ff_stream2_guid)) {
780 28 int stream_index = ff_find_stream_index(s, sid);
781
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 28 if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
782 ff_asf_guid mediatype, subtype, formattype;
783 int size;
784 4 avio_skip(pb, 12);
785 4 ff_get_guid(pb, &mediatype);
786 4 ff_get_guid(pb, &subtype);
787 4 avio_skip(pb, 12);
788 4 ff_get_guid(pb, &formattype);
789 4 size = avio_rl32(pb);
790
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 4 if (size < 0 || size > INT_MAX - 76 - consumed)
791 ✗ return AVERROR_INVALIDDATA;
792 4 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
793 4 consumed += 76 + size;
794 }
795
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 2778 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
796
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 2778 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
797
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 2778 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
798
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 2775 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
799
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 2771 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
800 1389 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
801 4 int stream_index = ff_find_stream_index(s, sid);
802
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 4 if (stream_index >= 0) {
803 4 AVStream *st = s->streams[stream_index];
804 4 uint8_t buf[258] = {0};
805 4 const uint8_t *pbuf = buf;
806 int buf_size;
807
808 4 avio_skip(pb, 8);
809 4 consumed += 8;
810
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 8 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
811 4 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
812 ✗ avio_skip(pb, 6);
813 ✗ consumed += 6;
814 }
815
816 4 buf_size = FFMIN(len - consumed, sizeof(buf));
817 4 ret = ffio_read_size(pb, buf, buf_size);
818
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 4 if (ret < 0)
819 ✗ return ret;
820 4 consumed += buf_size;
821 4 ff_parse_mpeg2_descriptor(s, st, 0, -1, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
822 }
823
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 1385 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
824 2 int stream_index = ff_find_stream_index(s, sid);
825
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 2 if (stream_index >= 0) {
826 2 AVStream *st = s->streams[stream_index];
827 int audio_type;
828 2 avio_skip(pb, 8);
829 2 audio_type = avio_r8(pb);
830
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 2 if (audio_type == 2)
831 1 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
832
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 1 else if (audio_type == 3)
833 ✗ st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
834 2 consumed += 9;
835 }
836
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 1383 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
837 3 int stream_index = ff_find_stream_index(s, sid);
838
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 3 if (stream_index >= 0) {
839 3 avio_skip(pb, 12);
840
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 3 if (avio_rl32(pb))
841 ✗ av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
842 3 consumed += 16;
843 }
844
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 1380 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
845 2 int stream_index = ff_find_stream_index(s, sid);
846
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 2 if (stream_index >= 0) {
847 2 AVStream *st = s->streams[stream_index];
848 uint8_t language[4];
849 2 avio_skip(pb, 12);
850
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 2 if (avio_read(pb, language, 3) != 3)
851 ✗ return AVERROR_INVALIDDATA;
852
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 2 if (language[0]) {
853 2 language[3] = 0;
854 2 av_dict_set(&st->metadata, "language", language, 0);
855
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 2 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
856 ✗ st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
857 }
858 2 consumed += 15;
859 }
860
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 1378 } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
861 397 int stream_index = ff_find_stream_index(s, sid);
862
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 397 if (stream_index >= 0) {
863 397 avio_skip(pb, 8);
864 397 wtv->pts = avio_rl64(pb);
865 397 consumed += 16;
866
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 397 if (wtv->pts == -1)
867 45 wtv->pts = AV_NOPTS_VALUE;
868 else {
869 352 wtv->last_valid_pts = wtv->pts;
870
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 352 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
871 5 wtv->epoch = wtv->pts;
872
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 352 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
873 5 avio_skip(pb, WTV_PAD8(len) - consumed);
874 5 return 0;
875 }
876 }
877 }
878
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 981 } else if (!ff_guidcmp(g, ff_data_guid)) {
879 400 int stream_index = ff_find_stream_index(s, sid);
880
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 400 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
881 298 WtvStream *wst = s->streams[stream_index]->priv_data;
882 298 wst->seen_data = 1;
883
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 298 if (len_ptr) {
884 295 *len_ptr = len;
885 }
886 298 return stream_index;
887 }
888
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 581 } else if (!ff_guidcmp(g, /* DSATTRIB_WMDRMProtectionInfo */ (const ff_asf_guid){0x83,0x95,0x74,0x40,0x9D,0x6B,0xEC,0x4E,0xB4,0x3C,0x67,0xA1,0x80,0x1E,0x1A,0x9B})) {
889 ✗ int stream_index = ff_find_stream_index(s, sid);
890 ✗ if (stream_index >= 0)
891 ✗ av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
892
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 581 } else if (
893
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 1029 !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}) ||
894
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✓ Branch 2 taken 96 times.
 896 !ff_guidcmp(g, /* DSATTRIB_PBDATAG_ATTRIBUTE */ (const ff_asf_guid){0x79,0x66,0xB5,0xE0,0xB9,0x12,0xCC,0x43,0xB7,0xDF,0x57,0x8C,0xAA,0x5A,0x7B,0x63}) ||
895
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 800 !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}) ||
896
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 571 !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
897
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 342 !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}) ||
898
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 245 !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}) ||
899
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 243 !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}) ||
900
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 242 !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}) ||
901
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 238 !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}) ||
902
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 233 !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}) ||
903
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 229 !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}) ||
904
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 226 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
905
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 226 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
906
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 226 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
907
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 226 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
908
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 226 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
909
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 199 !ff_guidcmp(g, ff_index_guid) ||
910
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 137 !ff_guidcmp(g, ff_sync_guid) ||
911
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 51 !ff_guidcmp(g, ff_stream1_guid) ||
912 ✗ !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
913 //ignore known guids
914 } else
915 ✗ av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
916
917
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 1148 if (avio_feof(pb))
918 ✗ break;
919
920 1148 avio_skip(pb, WTV_PAD8(len) - consumed);
921 }
922 11 return AVERROR_EOF;
923 }
924
925 3 static int read_header(AVFormatContext *s)
926 {
927 3 WtvContext *wtv = s->priv_data;
928 unsigned root_sector;
929 int root_size;
930 uint8_t root[WTV_SECTOR_SIZE];
931 AVIOContext *pb;
932 int64_t timeline_pos;
933 int64_t ret;
934
935 3 wtv->epoch =
936 3 wtv->pts =
937 3 wtv->last_valid_pts = AV_NOPTS_VALUE;
938
939 /* read root directory sector */
940 3 avio_skip(s->pb, 0x30);
941 3 root_size = avio_rl32(s->pb);
942
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 3 if (root_size > sizeof(root)) {
943 ✗ av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
944 ✗ return AVERROR_INVALIDDATA;
945 }
946 3 avio_skip(s->pb, 4);
947 3 root_sector = avio_rl32(s->pb);
948
949 3 ret = seek_by_sector(s->pb, root_sector, 0);
950
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 3 if (ret < 0)
951 ✗ return ret;
952 3 root_size = avio_read(s->pb, root, root_size);
953
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 3 if (root_size < 0)
954 ✗ return AVERROR_INVALIDDATA;
955
956 /* parse chunks up until first data chunk */
957 3 wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
958
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 3 if (!wtv->pb) {
959 ✗ av_log(s, AV_LOG_ERROR, "timeline data missing\n");
960 ✗ return AVERROR_INVALIDDATA;
961 }
962
963 3 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
964
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 3 if (ret < 0) {
965 ✗ wtvfile_close(wtv->pb);
966 ✗ return ret;
967 }
968 3 avio_seek(wtv->pb, -32, SEEK_CUR);
969
970 3 timeline_pos = avio_tell(s->pb); // save before opening another file
971
972 /* read metadata */
973 3 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
974
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 3 if (pb) {
975 3 parse_legacy_attrib(s, pb);
976 3 wtvfile_close(pb);
977 }
978
979 3 s->ctx_flags |= AVFMTCTX_NOHEADER; // Needed for noStreams.wtv
980
981 /* read seek index */
982
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 3 if (s->nb_streams) {
983 3 AVStream *st = s->streams[0];
984 3 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
985
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 3 if (pb) {
986 316 while(1) {
987 319 uint64_t timestamp = avio_rl64(pb);
988 319 uint64_t frame_nb = avio_rl64(pb);
989
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 319 if (avio_feof(pb))
990 3 break;
991 316 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
992 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
993 }
994 3 wtvfile_close(pb);
995
996
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 3 if (wtv->nb_index_entries) {
997 3 pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
998
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 3 if (pb) {
999 3 AVIndexEntry *e = wtv->index_entries;
1000 3 AVIndexEntry *e_end = wtv->index_entries + wtv->nb_index_entries - 1;
1001 3 uint64_t last_position = 0;
1002 207 while (1) {
1003 210 uint64_t frame_nb = avio_rl64(pb);
1004 210 uint64_t position = avio_rl64(pb);
1005
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 519 while (e <= e_end && frame_nb > e->size) {
1006 309 e->pos = last_position;
1007 309 e++;
1008 }
1009
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 210 if (avio_feof(pb))
1010 3 break;
1011 207 last_position = position;
1012 }
1013 3 e_end->pos = last_position;
1014 3 wtvfile_close(pb);
1015 3 st->duration = e_end->timestamp;
1016 }
1017 }
1018 }
1019 }
1020
1021 3 avio_seek(s->pb, timeline_pos, SEEK_SET);
1022 3 return 0;
1023 }
1024
1025 308 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1026 {
1027 308 WtvContext *wtv = s->priv_data;
1028 308 AVIOContext *pb = wtv->pb;
1029 int stream_index, len, ret;
1030
1031 308 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1032
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 308 if (stream_index < 0)
1033 13 return stream_index;
1034
1035 295 ret = av_get_packet(pb, pkt, len - 32);
1036
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 295 if (ret < 0)
1037 ✗ return ret;
1038 295 pkt->stream_index = stream_index;
1039 295 pkt->pts = wtv->pts;
1040 295 avio_skip(pb, WTV_PAD8(len) - len);
1041 295 return 0;
1042 }
1043
1044 26 static int read_seek(AVFormatContext *s, int stream_index,
1045 int64_t ts, int flags)
1046 {
1047 26 WtvContext *wtv = s->priv_data;
1048 26 AVIOContext *pb = wtv->pb;
1049 26 AVStream *st = s->streams[0];
1050 int64_t ts_relative;
1051 int i;
1052
1053
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 26 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1054 ✗ return AVERROR(ENOSYS);
1055
1056 /* timestamp adjustment is required because wtv->pts values are absolute,
1057 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1058 26 ts_relative = ts;
1059
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 26 if (wtv->epoch != AV_NOPTS_VALUE)
1060 26 ts_relative -= wtv->epoch;
1061
1062 26 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1063
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 26 if (i < 0) {
1064
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 10 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
1065
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 5 if (avio_seek(pb, 0, SEEK_SET) < 0)
1066 ✗ return -1;
1067
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 5 } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
1068
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 5 if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
1069 ✗ return -1;
1070 }
1071
2/2
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 10 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1072 5 return AVERROR(ERANGE);
1073 5 return 0;
1074 }
1075
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 16 if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
1076 ✗ return -1;
1077 16 wtv->pts = wtv->index_entries[i].timestamp;
1078
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 16 if (wtv->epoch != AV_NOPTS_VALUE)
1079 16 wtv->pts += wtv->epoch;
1080 16 wtv->last_valid_pts = wtv->pts;
1081 16 return 0;
1082 }
1083
1084 3 static int read_close(AVFormatContext *s)
1085 {
1086 3 WtvContext *wtv = s->priv_data;
1087 3 av_freep(&wtv->index_entries);
1088 3 wtvfile_close(wtv->pb);
1089 3 return 0;
1090 }
1091
1092 const FFInputFormat ff_wtv_demuxer = {
1093 .p.name = "wtv",
1094 .p.long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1095 .p.flags = AVFMT_SHOW_IDS,
1096 .priv_data_size = sizeof(WtvContext),
1097 .read_probe = read_probe,
1098 .read_header = read_header,
1099 .read_packet = read_packet,
1100 .read_seek = read_seek,
1101 .read_close = read_close,
1102 };
1103