movenc: Add a separate start_pts
[ffmpeg.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.h"
30 #include "libavutil/dict.h"
31 #include "avformat.h"
32 #include "internal.h"
33 #include "riff.h"
34 #include "asf.h"
35 #include "mpegts.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(wf);
306     av_free(pb->buffer);
307     av_free(pb);
308 }
309
310 /*
311  *
312  * Main demuxer
313  *
314  */
315
316 typedef struct {
317     int seen_data;
318 } WtvStream;
319
320 typedef struct {
321     AVIOContext *pb;       /** timeline file */
322     int64_t epoch;
323     int64_t pts;             /** pts for next data chunk */
324     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
325
326     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
327        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
328     AVIndexEntry *index_entries;
329     int nb_index_entries;
330     unsigned int index_entries_allocated_size;
331 } WtvContext;
332
333 typedef struct {
334     enum CodecID id;
335     ff_asf_guid guid;
336 } AVCodecGuid;
337
338 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
339 {
340     int i;
341     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
342         if (!ff_guidcmp(guids[i].guid, guid))
343             return guids[i].id;
344     }
345     return CODEC_ID_NONE;
346 }
347
348 /* WTV GUIDs */
349 static const ff_asf_guid wtv_guid =
350     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
351 static const ff_asf_guid metadata_guid =
352     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
353 static const ff_asf_guid timestamp_guid =
354     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
355 static const ff_asf_guid data_guid =
356     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
357 static const ff_asf_guid stream_guid =
358     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
359 static const ff_asf_guid stream2_guid =
360     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
361 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
362     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
363 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
364     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
365 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
366     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
367 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
368     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
369 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
370     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
371 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
372     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
373 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
374     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
375 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
376     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
377 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
378     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
379
380 /* Windows media GUIDs */
381
382 #define MEDIASUBTYPE_BASE_GUID \
383     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
384
385 /* Media types */
386 static const ff_asf_guid mediatype_audio =
387     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
388 static const ff_asf_guid mediatype_video =
389     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
390 static const ff_asf_guid mediasubtype_mpeg1payload =
391     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
392 static const ff_asf_guid mediatype_mpeg2_sections =
393     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
394 static const ff_asf_guid mediatype_mpeg2_pes =
395     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
396 static const ff_asf_guid mediatype_mstvcaption =
397     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
398
399 /* Media subtypes */
400 static const ff_asf_guid mediasubtype_cpfilters_processed =
401     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
402 static const ff_asf_guid mediasubtype_dvb_subtitle =
403     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
404 static const ff_asf_guid mediasubtype_teletext =
405     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
406 static const ff_asf_guid mediasubtype_dtvccdata =
407     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
408 static const ff_asf_guid mediasubtype_mpeg2_sections =
409     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
410
411 /* Formats */
412 static const ff_asf_guid format_cpfilters_processed =
413     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
414 static const ff_asf_guid format_waveformatex =
415     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
416 static const ff_asf_guid format_videoinfo2 =
417     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
418 static const ff_asf_guid format_mpeg2_video =
419     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
420 static const ff_asf_guid format_none =
421     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
422
423 static const AVCodecGuid video_guids[] = {
424     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
425     {CODEC_ID_NONE}
426 };
427
428 static const AVCodecGuid audio_guids[] = {
429     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
430     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
431     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
432     {CODEC_ID_NONE}
433 };
434
435 static int read_probe(AVProbeData *p)
436 {
437     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
438 }
439
440 /**
441  * Convert win32 FILETIME to ISO-8601 string
442  */
443 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
444 {
445     time_t t = (value / 10000000LL) - 11644473600LL;
446     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
447 }
448
449 /**
450  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
451  */
452 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
453 {
454     time_t t = (value / 10000000LL) - 719162LL*86400LL;
455     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
456 }
457
458 /**
459  * Convert OLE DATE to ISO-8601 string
460  */
461 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
462 {
463     time_t t = 631112400LL + 86400*av_int2double(value);
464     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
465 }
466
467 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
468 {
469     char mime[1024];
470     char description[1024];
471     unsigned int filesize;
472     AVStream *st;
473     int64_t pos = avio_tell(pb);
474
475     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
476     if (strcmp(mime, "image/jpeg"))
477         goto done;
478
479     avio_r8(pb);
480     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
481     filesize = avio_rl32(pb);
482     if (!filesize)
483         goto done;
484
485     st = avformat_new_stream(s, NULL);
486     if (!st)
487         goto done;
488     av_dict_set(&st->metadata, "title", description, 0);
489     st->codec->codec_id   = CODEC_ID_MJPEG;
490     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
491     st->codec->extradata  = av_mallocz(filesize);
492     if (!st->codec->extradata)
493         goto done;
494     st->codec->extradata_size = filesize;
495     avio_read(pb, st->codec->extradata, filesize);
496 done:
497     avio_seek(pb, pos + length, SEEK_SET);
498 }
499
500 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
501 {
502     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
503     char *buf = av_malloc(buf_size);
504     if (!buf)
505         return;
506
507     if (type == 0 && length == 4) {
508         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
509     } else if (type == 1) {
510         avio_get_str16le(pb, length, buf, buf_size);
511         if (!strlen(buf)) {
512            av_free(buf);
513            return;
514         }
515     } else if (type == 3 && length == 4) {
516         strcpy(buf, avio_rl32(pb) ? "true" : "false");
517     } else if (type == 4 && length == 8) {
518         int64_t num = avio_rl64(pb);
519         if (!strcmp(key, "WM/EncodingTime") ||
520             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
521             filetime_to_iso8601(buf, buf_size, num);
522         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
523                  !strcmp(key, "WM/WMRVEndTime"))
524             crazytime_to_iso8601(buf, buf_size, num);
525         else if (!strcmp(key, "WM/WMRVExpirationDate"))
526             oledate_to_iso8601(buf, buf_size, num);
527         else if (!strcmp(key, "WM/WMRVBitrate"))
528             snprintf(buf, buf_size, "%f", av_int2double(num));
529         else
530             snprintf(buf, buf_size, "%"PRIi64, num);
531     } else if (type == 5 && length == 2) {
532         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
533     } else if (type == 6 && length == 16) {
534         ff_asf_guid guid;
535         avio_read(pb, guid, 16);
536         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
537     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
538         get_attachment(s, pb, length);
539         av_freep(&buf);
540         return;
541     } else {
542         av_freep(&buf);
543         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
544         avio_skip(pb, length);
545         return;
546     }
547
548     av_dict_set(&s->metadata, key, buf, 0);
549     av_freep(&buf);
550 }
551
552 /**
553  * Parse metadata entries
554  */
555 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
556 {
557     ff_asf_guid guid;
558     int length, type;
559     while(!pb->eof_reached) {
560         char key[1024];
561         ff_get_guid(pb, &guid);
562         type   = avio_rl32(pb);
563         length = avio_rl32(pb);
564         if (!length)
565             break;
566         if (ff_guidcmp(&guid, metadata_guid)) {
567             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
568                    "remaining metadata entries ignored\n", ARG_GUID(guid));
569             break;
570         }
571         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
572         get_tag(s, pb, key, type, length);
573     }
574
575     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
576 }
577
578 /**
579  * parse VIDEOINFOHEADER2 structure
580  * @return bytes consumed
581  */
582 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
583 {
584     WtvContext *wtv = s->priv_data;
585     AVIOContext *pb = wtv->pb;
586
587     avio_skip(pb, 72);  // picture aspect ratio is unreliable
588     ff_get_bmp_header(pb, st);
589
590     return 72 + 40;
591 }
592
593 /**
594  * Parse MPEG1WAVEFORMATEX extradata structure
595  */
596 static void parse_mpeg1waveformatex(AVStream *st)
597 {
598     /* fwHeadLayer */
599     switch (AV_RL16(st->codec->extradata)) {
600     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
601     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
602     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
603     }
604
605     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
606
607     /* dwHeadMode */
608     switch (AV_RL16(st->codec->extradata + 6)) {
609     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
610     case 8 :                   st->codec->channels = 1; break;
611     }
612 }
613
614 /**
615  * Initialise stream
616  * @param st Stream to initialise, or NULL to create and initialise new stream
617  * @return NULL on error
618  */
619 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
620 {
621     if (st) {
622         if (st->codec->extradata) {
623             av_freep(&st->codec->extradata);
624             st->codec->extradata_size = 0;
625         }
626     } else {
627         WtvStream *wst = av_mallocz(sizeof(WtvStream));
628         if (!wst)
629             return NULL;
630         st = avformat_new_stream(s, NULL);
631         if (!st)
632             return NULL;
633         st->id = sid;
634         st->priv_data = wst;
635     }
636     st->codec->codec_type = codec_type;
637     st->need_parsing      = AVSTREAM_PARSE_FULL;
638     avpriv_set_pts_info(st, 64, 1, 10000000);
639     return st;
640 }
641
642 /**
643  * parse Media Type structure and populate stream
644  * @param st         Stream, or NULL to create new stream
645  * @param mediatype  Mediatype GUID
646  * @param subtype    Subtype GUID
647  * @param formattype Format GUID
648  * @param size       Size of format buffer
649  * @return NULL on error
650  */
651 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
652                                    ff_asf_guid mediatype, ff_asf_guid subtype,
653                                    ff_asf_guid formattype, int size)
654 {
655     WtvContext *wtv = s->priv_data;
656     AVIOContext *pb = wtv->pb;
657     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
658         !ff_guidcmp(formattype, format_cpfilters_processed)) {
659         ff_asf_guid actual_subtype;
660         ff_asf_guid actual_formattype;
661
662         if (size < 32) {
663             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
664             avio_skip(pb, size);
665             return NULL;
666         }
667
668         avio_skip(pb, size - 32);
669         ff_get_guid(pb, &actual_subtype);
670         ff_get_guid(pb, &actual_formattype);
671         avio_seek(pb, -size, SEEK_CUR);
672
673         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
674         avio_skip(pb, 32);
675         return st;
676     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
677         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
678         if (!st)
679             return NULL;
680         if (!ff_guidcmp(formattype, format_waveformatex)) {
681             int ret = ff_get_wav_header(pb, st->codec, size);
682             if (ret < 0)
683                 return NULL;
684         } else {
685             if (ff_guidcmp(formattype, format_none))
686                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
687             avio_skip(pb, size);
688         }
689
690         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
691             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
692         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
693             if (st->codec->extradata && st->codec->extradata_size >= 22)
694                 parse_mpeg1waveformatex(st);
695             else
696                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
697         } else {
698             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
699             if (st->codec->codec_id == CODEC_ID_NONE)
700                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
701         }
702         return st;
703     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
704         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
705         if (!st)
706             return NULL;
707         if (!ff_guidcmp(formattype, format_videoinfo2)) {
708             int consumed = parse_videoinfoheader2(s, st);
709             avio_skip(pb, FFMAX(size - consumed, 0));
710         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
711             int consumed = parse_videoinfoheader2(s, st);
712             avio_skip(pb, FFMAX(size - consumed, 0));
713         } else {
714             if (ff_guidcmp(formattype, format_none))
715                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
716             avio_skip(pb, size);
717         }
718
719         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
720             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
721         } else {
722             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
723         }
724         if (st->codec->codec_id == CODEC_ID_NONE)
725             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
726         return st;
727     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
728                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
729         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
730         if (!st)
731             return NULL;
732         if (ff_guidcmp(formattype, format_none))
733             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
734         avio_skip(pb, size);
735         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
736         return st;
737     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
738                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
739         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
740         if (!st)
741             return NULL;
742         if (ff_guidcmp(formattype, format_none))
743             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
744         avio_skip(pb, size);
745         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
746         return st;
747     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
748                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
749         if (ff_guidcmp(formattype, format_none))
750             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
751         avio_skip(pb, size);
752         return NULL;
753     }
754
755     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
756                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
757                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
758     avio_skip(pb, size);
759     return NULL;
760 }
761
762 enum {
763     SEEK_TO_DATA = 0,
764     SEEK_TO_PTS,
765 };
766
767 /**
768  * Parse WTV chunks
769  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
770  * @param seekts timestamp
771  * @param[out] len_ptr Length of data chunk
772  * @return stream index of data chunk, or <0 on error
773  */
774 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
775 {
776     WtvContext *wtv = s->priv_data;
777     AVIOContext *pb = wtv->pb;
778     while (!pb->eof_reached) {
779         ff_asf_guid g;
780         int len, sid, consumed;
781
782         ff_get_guid(pb, &g);
783         len = avio_rl32(pb);
784         if (len < 32)
785             break;
786         sid = avio_rl32(pb) & 0x7FFF;
787         avio_skip(pb, 8);
788         consumed = 32;
789
790         if (!ff_guidcmp(g, stream_guid)) {
791             if (ff_find_stream_index(s, sid) < 0) {
792                 ff_asf_guid mediatype, subtype, formattype;
793                 int size;
794                 avio_skip(pb, 28);
795                 ff_get_guid(pb, &mediatype);
796                 ff_get_guid(pb, &subtype);
797                 avio_skip(pb, 12);
798                 ff_get_guid(pb, &formattype);
799                 size = avio_rl32(pb);
800                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
801                 consumed += 92 + size;
802             }
803         } else if (!ff_guidcmp(g, stream2_guid)) {
804             int stream_index = ff_find_stream_index(s, sid);
805             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
806                 ff_asf_guid mediatype, subtype, formattype;
807                 int size;
808                 avio_skip(pb, 12);
809                 ff_get_guid(pb, &mediatype);
810                 ff_get_guid(pb, &subtype);
811                 avio_skip(pb, 12);
812                 ff_get_guid(pb, &formattype);
813                 size = avio_rl32(pb);
814                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
815                 consumed += 76 + size;
816             }
817         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
818                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
819                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
820                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
821                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
822                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
823             int stream_index = ff_find_stream_index(s, sid);
824             if (stream_index >= 0) {
825                 AVStream *st = s->streams[stream_index];
826                 uint8_t buf[258];
827                 const uint8_t *pbuf = buf;
828                 int buf_size;
829
830                 avio_skip(pb, 8);
831                 consumed += 8;
832                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
833                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
834                     avio_skip(pb, 6);
835                     consumed += 6;
836                 }
837
838                 buf_size = FFMIN(len - consumed, sizeof(buf));
839                 avio_read(pb, buf, buf_size);
840                 consumed += buf_size;
841                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
842             }
843         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
844             int stream_index = ff_find_stream_index(s, sid);
845             if (stream_index >= 0) {
846                 AVStream *st = s->streams[stream_index];
847                 int audio_type;
848                 avio_skip(pb, 8);
849                 audio_type = avio_r8(pb);
850                 if (audio_type == 2)
851                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
852                 else if (audio_type == 3)
853                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
854                 consumed += 9;
855             }
856         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
857             int stream_index = ff_find_stream_index(s, sid);
858             if (stream_index >= 0) {
859                 avio_skip(pb, 12);
860                 if (avio_rl32(pb))
861                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
862                 consumed += 16;
863             }
864         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
865             int stream_index = ff_find_stream_index(s, sid);
866             if (stream_index >= 0) {
867                 AVStream *st = s->streams[stream_index];
868                 uint8_t language[4];
869                 avio_skip(pb, 12);
870                 avio_read(pb, language, 3);
871                 if (language[0]) {
872                     language[3] = 0;
873                     av_dict_set(&st->metadata, "language", language, 0);
874                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
875                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
876                 }
877                 consumed += 15;
878             }
879         } else if (!ff_guidcmp(g, timestamp_guid)) {
880             int stream_index = ff_find_stream_index(s, sid);
881             if (stream_index >= 0) {
882                 avio_skip(pb, 8);
883                 wtv->pts = avio_rl64(pb);
884                 consumed += 16;
885                 if (wtv->pts == -1)
886                     wtv->pts = AV_NOPTS_VALUE;
887                 else {
888                     wtv->last_valid_pts = wtv->pts;
889                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
890                         wtv->epoch = wtv->pts;
891                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
892 #define WTV_PAD8(x) (((x) + 7) & ~7)
893                     avio_skip(pb, WTV_PAD8(len) - consumed);
894                     return 0;
895                 }
896                 }
897             }
898         } else if (!ff_guidcmp(g, data_guid)) {
899             int stream_index = ff_find_stream_index(s, sid);
900             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
901                 WtvStream *wst = s->streams[stream_index]->priv_data;
902                 wst->seen_data = 1;
903                 if (len_ptr) {
904                     *len_ptr = len;
905                 }
906                 return stream_index;
907             }
908         } else if (
909             !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}) ||
910             !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}) ||
911             !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}) ||
912             !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}) ||
913             !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}) ||
914             !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}) ||
915             !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}) ||
916             !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}) ||
917             !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}) ||
918             !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}) ||
919             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
920             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
921             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
922             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
923             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
924             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
925             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
926             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
927             //ignore known guids
928         } else
929             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
930
931         avio_skip(pb, WTV_PAD8(len) - consumed);
932     }
933     return AVERROR_EOF;
934 }
935
936 /* declare utf16le strings */
937 #define _ , 0,
938 static const uint8_t timeline_le16[] =
939     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
940 static const uint8_t table_0_entries_legacy_attrib_le16[] =
941     {'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};
942 static const uint8_t table_0_entries_time_le16[] =
943     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
944 static const uint8_t timeline_table_0_entries_Events_le16[] =
945     {'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};
946 #undef _
947
948 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
949 {
950     WtvContext *wtv = s->priv_data;
951     int root_sector, root_size;
952     uint8_t root[WTV_SECTOR_SIZE];
953     AVIOContext *pb;
954     int64_t timeline_pos;
955     int ret;
956
957     wtv->epoch          =
958     wtv->pts            =
959     wtv->last_valid_pts = AV_NOPTS_VALUE;
960
961     /* read root directory sector */
962     avio_skip(s->pb, 0x30);
963     root_size = avio_rl32(s->pb);
964     if (root_size > sizeof(root)) {
965         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
966         return AVERROR_INVALIDDATA;
967     }
968     avio_skip(s->pb, 4);
969     root_sector = avio_rl32(s->pb);
970
971     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
972     root_size = avio_read(s->pb, root, root_size);
973     if (root_size < 0)
974         return AVERROR_INVALIDDATA;
975
976     /* parse chunks up until first data chunk */
977     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
978     if (!wtv->pb) {
979         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
980         return AVERROR_INVALIDDATA;
981     }
982
983     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
984     if (ret < 0)
985         return ret;
986     avio_seek(wtv->pb, -32, SEEK_CUR);
987
988     timeline_pos = avio_tell(s->pb); // save before opening another file
989
990     /* read metadata */
991     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
992     if (pb) {
993         parse_legacy_attrib(s, pb);
994         wtvfile_close(pb);
995     }
996
997     /* read seek index */
998     if (s->nb_streams) {
999         AVStream *st = s->streams[0];
1000         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1001         if (pb) {
1002             while(1) {
1003                 uint64_t timestamp = avio_rl64(pb);
1004                 uint64_t frame_nb  = avio_rl64(pb);
1005                 if (pb->eof_reached)
1006                     break;
1007                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1008                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1009             }
1010             wtvfile_close(pb);
1011
1012             if (wtv->nb_index_entries) {
1013                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1014                 if (pb) {
1015                     int i;
1016                     while (1) {
1017                         uint64_t frame_nb = avio_rl64(pb);
1018                         uint64_t position = avio_rl64(pb);
1019                         if (pb->eof_reached)
1020                             break;
1021                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1022                             AVIndexEntry *e = wtv->index_entries + i;
1023                             if (frame_nb > e->size)
1024                                 break;
1025                             if (position > e->pos)
1026                                 e->pos = position;
1027                         }
1028                     }
1029                     wtvfile_close(pb);
1030                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1031                 }
1032             }
1033         }
1034     }
1035
1036     avio_seek(s->pb, timeline_pos, SEEK_SET);
1037     return 0;
1038 }
1039
1040 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1041 {
1042     WtvContext *wtv = s->priv_data;
1043     AVIOContext *pb = wtv->pb;
1044     int stream_index, len, ret;
1045
1046     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1047     if (stream_index < 0)
1048         return stream_index;
1049
1050     ret = av_get_packet(pb, pkt, len - 32);
1051     if (ret < 0)
1052         return ret;
1053     pkt->stream_index = stream_index;
1054     pkt->pts          = wtv->pts;
1055     avio_skip(pb, WTV_PAD8(len) - len);
1056     return 0;
1057 }
1058
1059 static int read_seek(AVFormatContext *s, int stream_index,
1060                      int64_t ts, int flags)
1061 {
1062     WtvContext *wtv = s->priv_data;
1063     AVIOContext *pb = wtv->pb;
1064     AVStream *st = s->streams[0];
1065     int64_t ts_relative;
1066     int i;
1067
1068     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1069         return AVERROR(ENOSYS);
1070
1071     /* timestamp adjustment is required because wtv->pts values are absolute,
1072      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1073     ts_relative = ts;
1074     if (wtv->epoch != AV_NOPTS_VALUE)
1075         ts_relative -= wtv->epoch;
1076
1077     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1078     if (i < 0) {
1079         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1080             avio_seek(pb, 0, SEEK_SET);
1081         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1082             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1083         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1084             return AVERROR(ERANGE);
1085         return 0;
1086     }
1087     wtv->pts = wtv->index_entries[i].timestamp;
1088     if (wtv->epoch != AV_NOPTS_VALUE)
1089         wtv->pts += wtv->epoch;
1090     wtv->last_valid_pts = wtv->pts;
1091     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1092     return 0;
1093 }
1094
1095 static int read_close(AVFormatContext *s)
1096 {
1097     WtvContext *wtv = s->priv_data;
1098     av_free(wtv->index_entries);
1099     wtvfile_close(wtv->pb);
1100     return 0;
1101 }
1102
1103 AVInputFormat ff_wtv_demuxer = {
1104     .name           = "wtv",
1105     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1106     .priv_data_size = sizeof(WtvContext),
1107     .read_probe     = read_probe,
1108     .read_header    = read_header,
1109     .read_packet    = read_packet,
1110     .read_seek      = read_seek,
1111     .read_close     = read_close,
1112     .flags          = AVFMT_SHOW_IDS,
1113 };