mpegts: Add support for Sections in PMT
[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_readwrite.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 #include <strings.h>
37
38 /* Macros for formating GUIDs */
39 #define PRI_GUID \
40     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
41 #define ARG_GUID(g) \
42     g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
43
44 #define PRI_PRETTY_GUID \
45     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
46 #define ARG_PRETTY_GUID(g) \
47     AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
48 #define LEN_PRETTY_GUID 34
49
50 /*
51  *
52  * File system routines
53  *
54  */
55
56 #define WTV_SECTOR_BITS    12
57 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
58 #define WTV_BIGSECTOR_BITS 18
59
60 typedef struct {
61     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
62
63     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
64     uint32_t *sectors;   /** file allocation table */
65     int nb_sectors;      /** number of sectors */
66
67     int error;
68     int64_t position;
69     int64_t length;
70 } WtvFile;
71
72 /**
73  * @return bytes read, 0 on end of file, or <0 on error
74  */
75 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
76 {
77     WtvFile *wf = opaque;
78     AVIOContext *pb = wf->pb_filesystem;
79     int nread = 0;
80
81     if (wf->error || pb->error)
82         return -1;
83     if (wf->position >= wf->length || pb->eof_reached)
84         return 0;
85
86     buf_size = FFMIN(buf_size, wf->length - wf->position);
87     while(nread < buf_size) {
88         int n;
89         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
90         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
91
92         n = avio_read(pb, buf, read_request);
93         if (n <= 0)
94             break;
95         nread += n;
96         buf += n;
97         wf->position += n;
98         if (n == remaining_in_sector) {
99             int i = wf->position >> wf->sector_bits;
100             if (i >= wf->nb_sectors ||
101                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
102                 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
103                 wf->error = 1;
104                 break;
105             }
106         }
107     }
108     return nread;
109 }
110
111 /**
112  * @return position (or file length)
113  */
114 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
115 {
116     WtvFile *wf = opaque;
117     AVIOContext *pb = wf->pb_filesystem;
118
119     if (whence == AVSEEK_SIZE)
120         return wf->length;
121     else if (whence == SEEK_CUR)
122         offset = wf->position + offset;
123     else if (whence == SEEK_END)
124         offset = wf->length;
125
126     wf->error = offset < 0 || offset >= wf->length ||
127                 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
128                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
129     wf->position = offset;
130     return offset;
131 }
132
133 /**
134  * read non-zero integers (le32) from input stream
135  * @param pb
136  * @param[out] data destination
137  * @param     count maximum number of integers to read
138  * @return    total number of integers read
139  */
140 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
141 {
142     int i, total = 0;
143     for (i = 0; i < count; i++) {
144         if ((data[total] = avio_rl32(pb)))
145            total++;
146     }
147     return total;
148 }
149
150 /**
151  * Open file
152  * @param first_sector  First sector
153  * @param length        Length of file (bytes)
154  * @param depth         File allocation table depth
155  * @return NULL on error
156  */
157 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
158 {
159     AVIOContext *pb;
160     WtvFile *wf;
161     uint8_t *buffer;
162
163     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
164         return NULL;
165
166     wf = av_mallocz(sizeof(WtvFile));
167     if (!wf)
168         return NULL;
169
170     if (depth == 0) {
171         wf->sectors = av_malloc(sizeof(uint32_t));
172         if (!wf->sectors) {
173             av_free(wf);
174             return NULL;
175         }
176         wf->sectors[0]  = first_sector;
177         wf->nb_sectors  = 1;
178         wf->sector_bits = WTV_SECTOR_BITS;
179     } else if (depth == 1) {
180         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
181         if (!wf->sectors) {
182             av_free(wf);
183             return NULL;
184         }
185         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
186         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
187     } else if (depth == 2) {
188         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
189         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
190         int i;
191
192         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
193         if (!wf->sectors) {
194             av_free(wf);
195             return NULL;
196         }
197         wf->nb_sectors = 0;
198         for (i = 0; i < nb_sectors1; i++) {
199             if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
200                 break;
201             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
202         }
203         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
204     } else {
205         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
206         av_free(wf);
207         return NULL;
208     }
209
210     if (!wf->nb_sectors) {
211         av_free(wf->sectors);
212         av_free(wf);
213         return NULL;
214     }
215
216     /* check length */
217     length &= 0xFFFFFFFFFFFF;
218     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
219         av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
220         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
221     }
222     wf->length = length;
223
224     /* seek to intial sector */
225     wf->position = 0;
226     if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
227         av_free(wf->sectors);
228         av_free(wf);
229         return NULL;
230     }
231
232     wf->pb_filesystem = s->pb;
233     buffer = av_malloc(1 << wf->sector_bits);
234     if (!buffer) {
235         av_free(wf->sectors);
236         av_free(wf);
237         return NULL;
238     }
239
240     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
241                            wtvfile_read_packet, NULL, wtvfile_seek);
242     if (!pb) {
243         av_free(buffer);
244         av_free(wf->sectors);
245         av_free(wf);
246     }
247     return pb;
248 }
249
250 static const ff_asf_guid dir_entry_guid =
251     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
252
253 /**
254  * Open file using filename
255  * @param[in]  buf       directory buffer
256  * @param      buf_size  directory buffer size
257  * @param[in]  filename
258  * @param      filename_size size of filename
259  * @return NULL on error
260  */
261 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
262 {
263     const uint8_t *buf_end = buf + buf_size;
264
265     while(buf + 48 <= buf_end) {
266         int dir_length, name_size, first_sector, depth;
267         uint64_t file_length;
268         const uint8_t *name;
269         if (ff_guidcmp(buf, dir_entry_guid)) {
270             av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
271                    "remaining directory entries ignored\n", ARG_GUID(buf));
272             break;
273         }
274         dir_length  = AV_RL16(buf + 16);
275         file_length = AV_RL64(buf + 24);
276         name_size   = 2 * AV_RL32(buf + 32);
277         if (buf + 48 + name_size > buf_end) {
278             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
279             break;
280         }
281         first_sector = AV_RL32(buf + 40 + name_size);
282         depth        = AV_RL32(buf + 44 + name_size);
283
284         /* compare file name; test optional null terminator */
285         name = buf + 40;
286         if (name_size >= filename_size &&
287             !memcmp(name, filename, filename_size) &&
288             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
289             return wtvfile_open_sector(first_sector, file_length, depth, s);
290
291         buf += dir_length;
292     }
293     return 0;
294 }
295
296 #define wtvfile_open(s, buf, buf_size, filename) \
297     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
298
299 /**
300  * Close file opened with wtvfile_open_sector(), or wtv_open()
301  */
302 static void wtvfile_close(AVIOContext *pb)
303 {
304     WtvFile *wf = pb->opaque;
305     av_free(wf->sectors);
306     av_free(pb);
307 }
308
309 /*
310  *
311  * Main demuxer
312  *
313  */
314
315 typedef struct {
316     int seen_data;
317 } WtvStream;
318
319 typedef struct {
320     AVIOContext *pb;       /** timeline file */
321     int64_t epoch;
322     int64_t pts;             /** pts for next data chunk */
323     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
324
325     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
326        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
327     AVIndexEntry *index_entries;
328     int nb_index_entries;
329     unsigned int index_entries_allocated_size;
330 } WtvContext;
331
332 typedef struct {
333     enum CodecID id;
334     ff_asf_guid guid;
335 } AVCodecGuid;
336
337 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
338 {
339     int i;
340     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
341         if (!ff_guidcmp(guids[i].guid, guid))
342             return guids[i].id;
343     }
344     return CODEC_ID_NONE;
345 }
346
347 /* WTV GUIDs */
348 static const ff_asf_guid wtv_guid =
349     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
350 static const ff_asf_guid metadata_guid =
351     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
352 static const ff_asf_guid timestamp_guid =
353     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
354 static const ff_asf_guid data_guid =
355     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
356 static const ff_asf_guid stream_guid =
357     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
358 static const ff_asf_guid stream2_guid =
359     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
360 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
361     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
362 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
363     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
364 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
365     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
366 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
367     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
368 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
369     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
370 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
371     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
372 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
373     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
374 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
375     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
376 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
377     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
378
379 /* Windows media GUIDs */
380
381 #define MEDIASUBTYPE_BASE_GUID \
382     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
383
384 /* Media types */
385 static const ff_asf_guid mediatype_audio =
386     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
387 static const ff_asf_guid mediatype_video =
388     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
389 static const ff_asf_guid mediasubtype_mpeg1payload =
390     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
391 static const ff_asf_guid mediatype_mpeg2_sections =
392     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
393 static const ff_asf_guid mediatype_mpeg2_pes =
394     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
395 static const ff_asf_guid mediatype_mstvcaption =
396     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
397
398 /* Media subtypes */
399 static const ff_asf_guid mediasubtype_cpfilters_processed =
400     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
401 static const ff_asf_guid mediasubtype_dvb_subtitle =
402     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
403 static const ff_asf_guid mediasubtype_teletext =
404     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
405 static const ff_asf_guid mediasubtype_dtvccdata =
406     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
407 static const ff_asf_guid mediasubtype_mpeg2_sections =
408     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
409
410 /* Formats */
411 static const ff_asf_guid format_cpfilters_processed =
412     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
413 static const ff_asf_guid format_waveformatex =
414     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
415 static const ff_asf_guid format_videoinfo2 =
416     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
417 static const ff_asf_guid format_mpeg2_video =
418     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
419 static const ff_asf_guid format_none =
420     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
421
422 static const AVCodecGuid video_guids[] = {
423     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
424     {CODEC_ID_NONE}
425 };
426
427 static const AVCodecGuid audio_guids[] = {
428     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
429     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
430     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
431     {CODEC_ID_NONE}
432 };
433
434 static int read_probe(AVProbeData *p)
435 {
436     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
437 }
438
439 /**
440  * Convert win32 FILETIME to ISO-8601 string
441  */
442 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
443 {
444     time_t t = (value / 10000000LL) - 11644473600LL;
445     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
446 }
447
448 /**
449  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
450  */
451 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
452 {
453     time_t t = (value / 10000000LL) - 719162LL*86400LL;
454     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
455 }
456
457 /**
458  * Convert OLE DATE to ISO-8601 string
459  */
460 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
461 {
462     time_t t = 631112400LL + 86400*av_int2dbl(value);
463     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
464 }
465
466 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
467 {
468     char mime[1024];
469     char description[1024];
470     unsigned int filesize;
471     AVStream *st;
472     int64_t pos = avio_tell(pb);
473
474     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
475     if (strcmp(mime, "image/jpeg"))
476         goto done;
477
478     avio_r8(pb);
479     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
480     filesize = avio_rl32(pb);
481     if (!filesize)
482         goto done;
483
484     st = avformat_new_stream(s, NULL);
485     if (!st)
486         goto done;
487     av_dict_set(&st->metadata, "title", description, 0);
488     st->codec->codec_id   = CODEC_ID_MJPEG;
489     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
490     st->codec->extradata  = av_mallocz(filesize);
491     if (!st->codec->extradata)
492         goto done;
493     st->codec->extradata_size = filesize;
494     avio_read(pb, st->codec->extradata, filesize);
495 done:
496     avio_seek(pb, pos + length, SEEK_SET);
497 }
498
499 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
500 {
501     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
502     char *buf = av_malloc(buf_size);
503     if (!buf)
504         return;
505
506     if (type == 0 && length == 4) {
507         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
508     } else if (type == 1) {
509         avio_get_str16le(pb, length, buf, buf_size);
510         if (!strlen(buf)) {
511            av_free(buf);
512            return;
513         }
514     } else if (type == 3 && length == 4) {
515         strcpy(buf, avio_rl32(pb) ? "true" : "false");
516     } else if (type == 4 && length == 8) {
517         int64_t num = avio_rl64(pb);
518         if (!strcmp(key, "WM/EncodingTime") ||
519             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
520             filetime_to_iso8601(buf, buf_size, num);
521         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
522                  !strcmp(key, "WM/WMRVEndTime"))
523             crazytime_to_iso8601(buf, buf_size, num);
524         else if (!strcmp(key, "WM/WMRVExpirationDate"))
525             oledate_to_iso8601(buf, buf_size, num);
526         else if (!strcmp(key, "WM/WMRVBitrate"))
527             snprintf(buf, buf_size, "%f", av_int2dbl(num));
528         else
529             snprintf(buf, buf_size, "%"PRIi64, num);
530     } else if (type == 5 && length == 2) {
531         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
532     } else if (type == 6 && length == 16) {
533         ff_asf_guid guid;
534         avio_read(pb, guid, 16);
535         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
536     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
537         get_attachment(s, pb, length);
538         av_freep(&buf);
539         return;
540     } else {
541         av_freep(&buf);
542         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
543         avio_skip(pb, length);
544         return;
545     }
546
547     av_dict_set(&s->metadata, key, buf, 0);
548     av_freep(&buf);
549 }
550
551 /**
552  * Parse metadata entries
553  */
554 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
555 {
556     ff_asf_guid guid;
557     int length, type;
558     while(!pb->eof_reached) {
559         char key[1024];
560         ff_get_guid(pb, &guid);
561         type   = avio_rl32(pb);
562         length = avio_rl32(pb);
563         if (!length)
564             break;
565         if (ff_guidcmp(&guid, metadata_guid)) {
566             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
567                    "remaining metadata entries ignored\n", ARG_GUID(guid));
568             break;
569         }
570         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
571         get_tag(s, pb, key, type, length);
572     }
573
574     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
575 }
576
577 /**
578  * parse VIDEOINFOHEADER2 structure
579  * @return bytes consumed
580  */
581 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
582 {
583     WtvContext *wtv = s->priv_data;
584     AVIOContext *pb = wtv->pb;
585
586     avio_skip(pb, 72);  // picture aspect ratio is unreliable
587     ff_get_bmp_header(pb, st);
588
589     return 72 + 40;
590 }
591
592 /**
593  * Parse MPEG1WAVEFORMATEX extradata structure
594  */
595 static void parse_mpeg1waveformatex(AVStream *st)
596 {
597     /* fwHeadLayer */
598     switch (AV_RL16(st->codec->extradata)) {
599     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
600     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
601     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
602     }
603
604     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
605
606     /* dwHeadMode */
607     switch (AV_RL16(st->codec->extradata + 6)) {
608     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
609     case 8 :                   st->codec->channels = 1; break;
610     }
611 }
612
613 /**
614  * Initialise stream
615  * @param st Stream to initialise, or NULL to create and initialise new stream
616  * @return NULL on error
617  */
618 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
619 {
620     if (st) {
621         if (st->codec->extradata) {
622             av_freep(&st->codec->extradata);
623             st->codec->extradata_size = 0;
624         }
625     } else {
626         WtvStream *wst = av_mallocz(sizeof(WtvStream));
627         if (!wst)
628             return NULL;
629         st = avformat_new_stream(s, NULL);
630         if (!st)
631             return NULL;
632         st->id = sid;
633         st->priv_data = wst;
634     }
635     st->codec->codec_type = codec_type;
636     st->need_parsing      = AVSTREAM_PARSE_FULL;
637     av_set_pts_info(st, 64, 1, 10000000);
638     return st;
639 }
640
641 /**
642  * parse Media Type structure and populate stream
643  * @param st         Stream, or NULL to create new stream
644  * @param mediatype  Mediatype GUID
645  * @param subtype    Subtype GUID
646  * @param formattype Format GUID
647  * @param size       Size of format buffer
648  * @return NULL on error
649  */
650 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
651                                    ff_asf_guid mediatype, ff_asf_guid subtype,
652                                    ff_asf_guid formattype, int size)
653 {
654     WtvContext *wtv = s->priv_data;
655     AVIOContext *pb = wtv->pb;
656     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
657         !ff_guidcmp(formattype, format_cpfilters_processed)) {
658         ff_asf_guid actual_subtype;
659         ff_asf_guid actual_formattype;
660
661         if (size < 32) {
662             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
663             avio_skip(pb, size);
664             return NULL;
665         }
666
667         avio_skip(pb, size - 32);
668         ff_get_guid(pb, &actual_subtype);
669         ff_get_guid(pb, &actual_formattype);
670         avio_seek(pb, -size, SEEK_CUR);
671
672         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
673         avio_skip(pb, 32);
674         return st;
675     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
676         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
677         if (!st)
678             return NULL;
679         if (!ff_guidcmp(formattype, format_waveformatex)) {
680             int ret = ff_get_wav_header(pb, st->codec, size);
681             if (ret < 0)
682                 return NULL;
683         } else {
684             if (ff_guidcmp(formattype, format_none))
685                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
686             avio_skip(pb, size);
687         }
688
689         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
690             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
691         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
692             if (st->codec->extradata && st->codec->extradata_size >= 22)
693                 parse_mpeg1waveformatex(st);
694             else
695                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
696         } else {
697             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
698             if (st->codec->codec_id == CODEC_ID_NONE)
699                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
700         }
701         return st;
702     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
703         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
704         if (!st)
705             return NULL;
706         if (!ff_guidcmp(formattype, format_videoinfo2)) {
707             int consumed = parse_videoinfoheader2(s, st);
708             avio_skip(pb, FFMAX(size - consumed, 0));
709         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
710             int consumed = parse_videoinfoheader2(s, st);
711             avio_skip(pb, FFMAX(size - consumed, 0));
712         } else {
713             if (ff_guidcmp(formattype, format_none))
714                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
715             avio_skip(pb, size);
716         }
717
718         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
719             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
720         } else {
721             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
722         }
723         if (st->codec->codec_id == CODEC_ID_NONE)
724             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
725         return st;
726     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
727                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
728         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
729         if (!st)
730             return NULL;
731         if (ff_guidcmp(formattype, format_none))
732             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
733         avio_skip(pb, size);
734         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
735         return st;
736     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
737                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
738         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
739         if (!st)
740             return NULL;
741         if (ff_guidcmp(formattype, format_none))
742             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
743         avio_skip(pb, size);
744         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
745         return st;
746     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
747                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
748         if (ff_guidcmp(formattype, format_none))
749             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
750         avio_skip(pb, size);
751         return NULL;
752     }
753
754     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
755                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
756                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
757     avio_skip(pb, size);
758     return NULL;
759 }
760
761 enum {
762     SEEK_TO_DATA = 0,
763     SEEK_TO_PTS,
764 };
765
766 /**
767  * Parse WTV chunks
768  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
769  * @param seekts timestamp
770  * @param[out] len_ptr Length of data chunk
771  * @return stream index of data chunk, or <0 on error
772  */
773 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
774 {
775     WtvContext *wtv = s->priv_data;
776     AVIOContext *pb = wtv->pb;
777     while (!pb->eof_reached) {
778         ff_asf_guid g;
779         int len, sid, consumed;
780
781         ff_get_guid(pb, &g);
782         len = avio_rl32(pb);
783         if (len < 32)
784             break;
785         sid = avio_rl32(pb) & 0x7FFF;
786         avio_skip(pb, 8);
787         consumed = 32;
788
789         if (!ff_guidcmp(g, stream_guid)) {
790             if (ff_find_stream_index(s, sid) < 0) {
791                 ff_asf_guid mediatype, subtype, formattype;
792                 int size;
793                 avio_skip(pb, 28);
794                 ff_get_guid(pb, &mediatype);
795                 ff_get_guid(pb, &subtype);
796                 avio_skip(pb, 12);
797                 ff_get_guid(pb, &formattype);
798                 size = avio_rl32(pb);
799                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
800                 consumed += 92 + size;
801             }
802         } else if (!ff_guidcmp(g, stream2_guid)) {
803             int stream_index = ff_find_stream_index(s, sid);
804             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
805                 ff_asf_guid mediatype, subtype, formattype;
806                 int size;
807                 avio_skip(pb, 12);
808                 ff_get_guid(pb, &mediatype);
809                 ff_get_guid(pb, &subtype);
810                 avio_skip(pb, 12);
811                 ff_get_guid(pb, &formattype);
812                 size = avio_rl32(pb);
813                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
814                 consumed += 76 + size;
815             }
816         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
817                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
818                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
819                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
820                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
821                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
822             int stream_index = ff_find_stream_index(s, sid);
823             if (stream_index >= 0) {
824                 AVStream *st = s->streams[stream_index];
825                 uint8_t buf[258];
826                 const uint8_t *pbuf = buf;
827                 int buf_size;
828
829                 avio_skip(pb, 8);
830                 consumed += 8;
831                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
832                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
833                     avio_skip(pb, 6);
834                     consumed += 6;
835                 }
836
837                 buf_size = FFMIN(len - consumed, sizeof(buf));
838                 avio_read(pb, buf, buf_size);
839                 consumed += buf_size;
840                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
841             }
842         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
843             int stream_index = ff_find_stream_index(s, sid);
844             if (stream_index >= 0) {
845                 AVStream *st = s->streams[stream_index];
846                 int audio_type;
847                 avio_skip(pb, 8);
848                 audio_type = avio_r8(pb);
849                 if (audio_type == 2)
850                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
851                 else if (audio_type == 3)
852                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
853                 consumed += 9;
854             }
855         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
856             int stream_index = ff_find_stream_index(s, sid);
857             if (stream_index >= 0) {
858                 avio_skip(pb, 12);
859                 if (avio_rl32(pb))
860                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
861                 consumed += 16;
862             }
863         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
864             int stream_index = ff_find_stream_index(s, sid);
865             if (stream_index >= 0) {
866                 AVStream *st = s->streams[stream_index];
867                 uint8_t language[4];
868                 avio_skip(pb, 12);
869                 avio_read(pb, language, 3);
870                 if (language[0]) {
871                     language[3] = 0;
872                     av_dict_set(&st->metadata, "language", language, 0);
873                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
874                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
875                 }
876                 consumed += 15;
877             }
878         } else if (!ff_guidcmp(g, timestamp_guid)) {
879             int stream_index = ff_find_stream_index(s, sid);
880             if (stream_index >= 0) {
881                 avio_skip(pb, 8);
882                 wtv->pts = avio_rl64(pb);
883                 consumed += 16;
884                 if (wtv->pts == -1)
885                     wtv->pts = AV_NOPTS_VALUE;
886                 else {
887                     wtv->last_valid_pts = wtv->pts;
888                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
889                         wtv->epoch = wtv->pts;
890                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
891 #define WTV_PAD8(x) (((x) + 7) & ~7)
892                     avio_skip(pb, WTV_PAD8(len) - consumed);
893                     return 0;
894                 }
895                 }
896             }
897         } else if (!ff_guidcmp(g, data_guid)) {
898             int stream_index = ff_find_stream_index(s, sid);
899             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
900                 WtvStream *wst = s->streams[stream_index]->priv_data;
901                 wst->seen_data = 1;
902                 if (len_ptr) {
903                     *len_ptr = len;
904                 }
905                 return stream_index;
906             }
907         } else if (
908             !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}) ||
909             !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}) ||
910             !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}) ||
911             !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}) ||
912             !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}) ||
913             !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}) ||
914             !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}) ||
915             !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}) ||
916             !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}) ||
917             !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}) ||
918             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
919             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
920             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
921             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
922             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
923             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
924             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
925             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
926             //ignore known guids
927         } else
928             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
929
930         avio_skip(pb, WTV_PAD8(len) - consumed);
931     }
932     return AVERROR_EOF;
933 }
934
935 /* declare utf16le strings */
936 #define _ , 0,
937 static const uint8_t timeline_le16[] =
938     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
939 static const uint8_t table_0_entries_legacy_attrib_le16[] =
940     {'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};
941 static const uint8_t table_0_entries_time_le16[] =
942     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
943 static const uint8_t timeline_table_0_entries_Events_le16[] =
944     {'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};
945 #undef _
946
947 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
948 {
949     WtvContext *wtv = s->priv_data;
950     int root_sector, root_size;
951     uint8_t root[WTV_SECTOR_SIZE];
952     AVIOContext *pb;
953     int64_t timeline_pos;
954     int ret;
955
956     wtv->epoch          =
957     wtv->pts            =
958     wtv->last_valid_pts = AV_NOPTS_VALUE;
959
960     /* read root directory sector */
961     avio_skip(s->pb, 0x30);
962     root_size = avio_rl32(s->pb);
963     if (root_size > sizeof(root)) {
964         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
965         return AVERROR_INVALIDDATA;
966     }
967     avio_skip(s->pb, 4);
968     root_sector = avio_rl32(s->pb);
969
970     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
971     root_size = avio_read(s->pb, root, root_size);
972     if (root_size < 0)
973         return AVERROR_INVALIDDATA;
974
975     /* parse chunks up until first data chunk */
976     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
977     if (!wtv->pb) {
978         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
979         return AVERROR_INVALIDDATA;
980     }
981
982     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
983     if (ret < 0)
984         return ret;
985     avio_seek(wtv->pb, -32, SEEK_CUR);
986
987     timeline_pos = avio_tell(s->pb); // save before opening another file
988
989     /* read metadata */
990     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
991     if (pb) {
992         parse_legacy_attrib(s, pb);
993         wtvfile_close(pb);
994     }
995
996     /* read seek index */
997     if (s->nb_streams) {
998         AVStream *st = s->streams[0];
999         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1000         if (pb) {
1001             while(1) {
1002                 uint64_t timestamp = avio_rl64(pb);
1003                 uint64_t frame_nb  = avio_rl64(pb);
1004                 if (pb->eof_reached)
1005                     break;
1006                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1007                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1008             }
1009             wtvfile_close(pb);
1010
1011             if (wtv->nb_index_entries) {
1012                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1013                 if (pb) {
1014                     int i;
1015                     while (1) {
1016                         uint64_t frame_nb = avio_rl64(pb);
1017                         uint64_t position = avio_rl64(pb);
1018                         if (pb->eof_reached)
1019                             break;
1020                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1021                             AVIndexEntry *e = wtv->index_entries + i;
1022                             if (frame_nb > e->size)
1023                                 break;
1024                             if (position > e->pos)
1025                                 e->pos = position;
1026                         }
1027                     }
1028                     wtvfile_close(pb);
1029                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1030                 }
1031             }
1032         }
1033     }
1034
1035     avio_seek(s->pb, timeline_pos, SEEK_SET);
1036     return 0;
1037 }
1038
1039 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1040 {
1041     WtvContext *wtv = s->priv_data;
1042     AVIOContext *pb = wtv->pb;
1043     int stream_index, len, ret;
1044
1045     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1046     if (stream_index < 0)
1047         return stream_index;
1048
1049     ret = av_get_packet(pb, pkt, len - 32);
1050     if (ret < 0)
1051         return ret;
1052     pkt->stream_index = stream_index;
1053     pkt->pts          = wtv->pts;
1054     avio_skip(pb, WTV_PAD8(len) - len);
1055     return 0;
1056 }
1057
1058 static int read_seek(AVFormatContext *s, int stream_index,
1059                      int64_t ts, int flags)
1060 {
1061     WtvContext *wtv = s->priv_data;
1062     AVIOContext *pb = wtv->pb;
1063     AVStream *st = s->streams[0];
1064     int64_t ts_relative;
1065     int i;
1066
1067     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1068         return AVERROR(ENOSYS);
1069
1070     /* timestamp adjustment is required because wtv->pts values are absolute,
1071      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1072     ts_relative = ts;
1073     if (wtv->epoch != AV_NOPTS_VALUE)
1074         ts_relative -= wtv->epoch;
1075
1076     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1077     if (i < 0) {
1078         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1079             avio_seek(pb, 0, SEEK_SET);
1080         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1081             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1082         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1083             return AVERROR(ERANGE);
1084         return 0;
1085     }
1086     wtv->pts = wtv->index_entries[i].timestamp;
1087     if (wtv->epoch != AV_NOPTS_VALUE)
1088         wtv->pts += wtv->epoch;
1089     wtv->last_valid_pts = wtv->pts;
1090     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1091     return 0;
1092 }
1093
1094 static int read_close(AVFormatContext *s)
1095 {
1096     WtvContext *wtv = s->priv_data;
1097     wtvfile_close(wtv->pb);
1098     return 0;
1099 }
1100
1101 AVInputFormat ff_wtv_demuxer = {
1102     .name           = "wtv",
1103     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1104     .priv_data_size = sizeof(WtvContext),
1105     .read_probe     = read_probe,
1106     .read_header    = read_header,
1107     .read_packet    = read_packet,
1108     .read_seek      = read_seek,
1109     .read_close     = read_close,
1110     .flags          = AVFMT_SHOW_IDS,
1111 };