miscellaneous typo fixes
[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/channel_layout.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/intfloat.h"
31 #include "libavutil/dict.h"
32 #include "avformat.h"
33 #include "internal.h"
34 #include "riff.h"
35 #include "asf.h"
36 #include "mpegts.h"
37
38 /* Macros for formating GUIDs */
39 #define PRI_GUID \
40     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
41 #define ARG_GUID(g) \
42     g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
43
44 #define PRI_PRETTY_GUID \
45     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
46 #define ARG_PRETTY_GUID(g) \
47     AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
48 #define LEN_PRETTY_GUID 34
49
50 /*
51  *
52  * File system routines
53  *
54  */
55
56 #define WTV_SECTOR_BITS    12
57 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
58 #define WTV_BIGSECTOR_BITS 18
59
60 typedef struct {
61     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
62
63     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
64     uint32_t *sectors;   /** file allocation table */
65     int nb_sectors;      /** number of sectors */
66
67     int error;
68     int64_t position;
69     int64_t length;
70 } WtvFile;
71
72 /**
73  * @return bytes read, 0 on end of file, or <0 on error
74  */
75 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
76 {
77     WtvFile *wf = opaque;
78     AVIOContext *pb = wf->pb_filesystem;
79     int nread = 0;
80
81     if (wf->error || pb->error)
82         return -1;
83     if (wf->position >= wf->length || pb->eof_reached)
84         return 0;
85
86     buf_size = FFMIN(buf_size, wf->length - wf->position);
87     while(nread < buf_size) {
88         int n;
89         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
90         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
91
92         n = avio_read(pb, buf, read_request);
93         if (n <= 0)
94             break;
95         nread += n;
96         buf += n;
97         wf->position += n;
98         if (n == remaining_in_sector) {
99             int i = wf->position >> wf->sector_bits;
100             if (i >= wf->nb_sectors ||
101                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
102                 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
103                 wf->error = 1;
104                 break;
105             }
106         }
107     }
108     return nread;
109 }
110
111 /**
112  * @return position (or file length)
113  */
114 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
115 {
116     WtvFile *wf = opaque;
117     AVIOContext *pb = wf->pb_filesystem;
118
119     if (whence == AVSEEK_SIZE)
120         return wf->length;
121     else if (whence == SEEK_CUR)
122         offset = wf->position + offset;
123     else if (whence == SEEK_END)
124         offset = wf->length;
125
126     wf->error = offset < 0 || offset >= wf->length ||
127                 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
128                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
129     wf->position = offset;
130     return offset;
131 }
132
133 /**
134  * read non-zero integers (le32) from input stream
135  * @param pb
136  * @param[out] data destination
137  * @param     count maximum number of integers to read
138  * @return    total number of integers read
139  */
140 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
141 {
142     int i, total = 0;
143     for (i = 0; i < count; i++) {
144         if ((data[total] = avio_rl32(pb)))
145            total++;
146     }
147     return total;
148 }
149
150 /**
151  * Open file
152  * @param first_sector  First sector
153  * @param length        Length of file (bytes)
154  * @param depth         File allocation table depth
155  * @return NULL on error
156  */
157 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
158 {
159     AVIOContext *pb;
160     WtvFile *wf;
161     uint8_t *buffer;
162
163     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
164         return NULL;
165
166     wf = av_mallocz(sizeof(WtvFile));
167     if (!wf)
168         return NULL;
169
170     if (depth == 0) {
171         wf->sectors = av_malloc(sizeof(uint32_t));
172         if (!wf->sectors) {
173             av_free(wf);
174             return NULL;
175         }
176         wf->sectors[0]  = first_sector;
177         wf->nb_sectors  = 1;
178         wf->sector_bits = WTV_SECTOR_BITS;
179     } else if (depth == 1) {
180         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
181         if (!wf->sectors) {
182             av_free(wf);
183             return NULL;
184         }
185         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
186         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
187     } else if (depth == 2) {
188         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
189         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
190         int i;
191
192         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
193         if (!wf->sectors) {
194             av_free(wf);
195             return NULL;
196         }
197         wf->nb_sectors = 0;
198         for (i = 0; i < nb_sectors1; i++) {
199             if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
200                 break;
201             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
202         }
203         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
204     } else {
205         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
206         av_free(wf);
207         return NULL;
208     }
209
210     if (!wf->nb_sectors) {
211         av_free(wf->sectors);
212         av_free(wf);
213         return NULL;
214     }
215
216     /* check length */
217     length &= 0xFFFFFFFFFFFF;
218     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
219         av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
220         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
221     }
222     wf->length = length;
223
224     /* seek to initial sector */
225     wf->position = 0;
226     if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
227         av_free(wf->sectors);
228         av_free(wf);
229         return NULL;
230     }
231
232     wf->pb_filesystem = s->pb;
233     buffer = av_malloc(1 << wf->sector_bits);
234     if (!buffer) {
235         av_free(wf->sectors);
236         av_free(wf);
237         return NULL;
238     }
239
240     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
241                            wtvfile_read_packet, NULL, wtvfile_seek);
242     if (!pb) {
243         av_free(buffer);
244         av_free(wf->sectors);
245         av_free(wf);
246     }
247     return pb;
248 }
249
250 static const ff_asf_guid dir_entry_guid =
251     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
252
253 /**
254  * Open file using filename
255  * @param[in]  buf       directory buffer
256  * @param      buf_size  directory buffer size
257  * @param[in]  filename
258  * @param      filename_size size of filename
259  * @return NULL on error
260  */
261 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
262 {
263     const uint8_t *buf_end = buf + buf_size;
264
265     while(buf + 48 <= buf_end) {
266         int dir_length, name_size, first_sector, depth;
267         uint64_t file_length;
268         const uint8_t *name;
269         if (ff_guidcmp(buf, dir_entry_guid)) {
270             av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
271                    "remaining directory entries ignored\n", ARG_GUID(buf));
272             break;
273         }
274         dir_length  = AV_RL16(buf + 16);
275         file_length = AV_RL64(buf + 24);
276         name_size   = 2 * AV_RL32(buf + 32);
277         if (buf + 48 + name_size > buf_end) {
278             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
279             break;
280         }
281         first_sector = AV_RL32(buf + 40 + name_size);
282         depth        = AV_RL32(buf + 44 + name_size);
283
284         /* compare file name; test optional null terminator */
285         name = buf + 40;
286         if (name_size >= filename_size &&
287             !memcmp(name, filename, filename_size) &&
288             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
289             return wtvfile_open_sector(first_sector, file_length, depth, s);
290
291         buf += dir_length;
292     }
293     return 0;
294 }
295
296 #define wtvfile_open(s, buf, buf_size, filename) \
297     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
298
299 /**
300  * Close file opened with wtvfile_open_sector(), or wtv_open()
301  */
302 static void wtvfile_close(AVIOContext *pb)
303 {
304     WtvFile *wf = pb->opaque;
305     av_free(wf->sectors);
306     av_free(wf);
307     av_free(pb->buffer);
308     av_free(pb);
309 }
310
311 /*
312  *
313  * Main demuxer
314  *
315  */
316
317 typedef struct {
318     int seen_data;
319 } WtvStream;
320
321 typedef struct {
322     AVIOContext *pb;       /** timeline file */
323     int64_t epoch;
324     int64_t pts;             /** pts for next data chunk */
325     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
326
327     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
328        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
329     AVIndexEntry *index_entries;
330     int nb_index_entries;
331     unsigned int index_entries_allocated_size;
332 } WtvContext;
333
334 typedef struct {
335     enum AVCodecID id;
336     ff_asf_guid guid;
337 } AVCodecGuid;
338
339 static enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
340 {
341     int i;
342     for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++) {
343         if (!ff_guidcmp(guids[i].guid, guid))
344             return guids[i].id;
345     }
346     return AV_CODEC_ID_NONE;
347 }
348
349 /* WTV GUIDs */
350 static const ff_asf_guid wtv_guid =
351     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
352 static const ff_asf_guid metadata_guid =
353     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
354 static const ff_asf_guid timestamp_guid =
355     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
356 static const ff_asf_guid data_guid =
357     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
358 static const ff_asf_guid stream_guid =
359     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
360 static const ff_asf_guid stream2_guid =
361     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
362 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
363     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
364 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
365     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
366 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
367     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
368 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
369     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
370 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
371     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
372 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
373     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
374 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
375     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
376 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
377     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
378 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
379     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
380
381 /* Windows media GUIDs */
382
383 #define MEDIASUBTYPE_BASE_GUID \
384     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
385
386 /* Media types */
387 static const ff_asf_guid mediatype_audio =
388     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
389 static const ff_asf_guid mediatype_video =
390     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
391 static const ff_asf_guid mediasubtype_mpeg1payload =
392     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
393 static const ff_asf_guid mediatype_mpeg2_sections =
394     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
395 static const ff_asf_guid mediatype_mpeg2_pes =
396     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
397 static const ff_asf_guid mediatype_mstvcaption =
398     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
399
400 /* Media subtypes */
401 static const ff_asf_guid mediasubtype_cpfilters_processed =
402     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
403 static const ff_asf_guid mediasubtype_dvb_subtitle =
404     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
405 static const ff_asf_guid mediasubtype_teletext =
406     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
407 static const ff_asf_guid mediasubtype_dtvccdata =
408     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
409 static const ff_asf_guid mediasubtype_mpeg2_sections =
410     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
411
412 /* Formats */
413 static const ff_asf_guid format_cpfilters_processed =
414     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
415 static const ff_asf_guid format_waveformatex =
416     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
417 static const ff_asf_guid format_videoinfo2 =
418     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
419 static const ff_asf_guid format_mpeg2_video =
420     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
421 static const ff_asf_guid format_none =
422     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
423
424 static const AVCodecGuid video_guids[] = {
425     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
426     {AV_CODEC_ID_NONE}
427 };
428
429 static const AVCodecGuid audio_guids[] = {
430     {AV_CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
431     {AV_CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
432     {AV_CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
433     {AV_CODEC_ID_NONE}
434 };
435
436 static int read_probe(AVProbeData *p)
437 {
438     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
439 }
440
441 /**
442  * Convert win32 FILETIME to ISO-8601 string
443  */
444 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
445 {
446     time_t t = (value / 10000000LL) - 11644473600LL;
447     struct tm *tm = gmtime(&t);
448     if (tm)
449         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
450     else
451         buf[0] = '\0';
452 }
453
454 /**
455  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
456  */
457 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
458 {
459     time_t t = (value / 10000000LL) - 719162LL*86400LL;
460     struct tm *tm = gmtime(&t);
461     if (tm)
462         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
463     else
464         buf[0] = '\0';
465 }
466
467 /**
468  * Convert OLE DATE to ISO-8601 string
469  */
470 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
471 {
472     time_t t = 631112400LL + 86400*av_int2double(value);
473     struct tm *tm = gmtime(&t);
474     if (tm)
475         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
476     else
477         buf[0] = '\0';
478 }
479
480 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
481 {
482     char mime[1024];
483     char description[1024];
484     unsigned int filesize;
485     AVStream *st;
486     int64_t pos = avio_tell(pb);
487
488     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
489     if (strcmp(mime, "image/jpeg"))
490         goto done;
491
492     avio_r8(pb);
493     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
494     filesize = avio_rl32(pb);
495     if (!filesize)
496         goto done;
497
498     st = avformat_new_stream(s, NULL);
499     if (!st)
500         goto done;
501     av_dict_set(&st->metadata, "title", description, 0);
502     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
503     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
504     st->codec->extradata  = av_mallocz(filesize);
505     if (!st->codec->extradata)
506         goto done;
507     st->codec->extradata_size = filesize;
508     avio_read(pb, st->codec->extradata, filesize);
509 done:
510     avio_seek(pb, pos + length, SEEK_SET);
511 }
512
513 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
514 {
515     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
516     char *buf = av_malloc(buf_size);
517     if (!buf)
518         return;
519
520     if (type == 0 && length == 4) {
521         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
522     } else if (type == 1) {
523         avio_get_str16le(pb, length, buf, buf_size);
524         if (!strlen(buf)) {
525            av_free(buf);
526            return;
527         }
528     } else if (type == 3 && length == 4) {
529         strcpy(buf, avio_rl32(pb) ? "true" : "false");
530     } else if (type == 4 && length == 8) {
531         int64_t num = avio_rl64(pb);
532         if (!strcmp(key, "WM/EncodingTime") ||
533             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
534             filetime_to_iso8601(buf, buf_size, num);
535         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
536                  !strcmp(key, "WM/WMRVEndTime"))
537             crazytime_to_iso8601(buf, buf_size, num);
538         else if (!strcmp(key, "WM/WMRVExpirationDate"))
539             oledate_to_iso8601(buf, buf_size, num);
540         else if (!strcmp(key, "WM/WMRVBitrate"))
541             snprintf(buf, buf_size, "%f", av_int2double(num));
542         else
543             snprintf(buf, buf_size, "%"PRIi64, num);
544     } else if (type == 5 && length == 2) {
545         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
546     } else if (type == 6 && length == 16) {
547         ff_asf_guid guid;
548         avio_read(pb, guid, 16);
549         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
550     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
551         get_attachment(s, pb, length);
552         av_freep(&buf);
553         return;
554     } else {
555         av_freep(&buf);
556         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
557         avio_skip(pb, length);
558         return;
559     }
560
561     av_dict_set(&s->metadata, key, buf, 0);
562     av_freep(&buf);
563 }
564
565 /**
566  * Parse metadata entries
567  */
568 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
569 {
570     ff_asf_guid guid;
571     int length, type;
572     while(!pb->eof_reached) {
573         char key[1024];
574         ff_get_guid(pb, &guid);
575         type   = avio_rl32(pb);
576         length = avio_rl32(pb);
577         if (!length)
578             break;
579         if (ff_guidcmp(&guid, metadata_guid)) {
580             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
581                    "remaining metadata entries ignored\n", ARG_GUID(guid));
582             break;
583         }
584         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
585         get_tag(s, pb, key, type, length);
586     }
587
588     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
589 }
590
591 /**
592  * parse VIDEOINFOHEADER2 structure
593  * @return bytes consumed
594  */
595 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
596 {
597     WtvContext *wtv = s->priv_data;
598     AVIOContext *pb = wtv->pb;
599
600     avio_skip(pb, 72);  // picture aspect ratio is unreliable
601     ff_get_bmp_header(pb, st);
602
603     return 72 + 40;
604 }
605
606 /**
607  * Parse MPEG1WAVEFORMATEX extradata structure
608  */
609 static void parse_mpeg1waveformatex(AVStream *st)
610 {
611     /* fwHeadLayer */
612     switch (AV_RL16(st->codec->extradata)) {
613     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
614     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
615     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
616     }
617
618     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
619
620     /* dwHeadMode */
621     switch (AV_RL16(st->codec->extradata + 6)) {
622     case 1 :
623     case 2 :
624     case 4 : st->codec->channels       = 2;
625              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
626              break;
627     case 8 : st->codec->channels       = 1;
628              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
629              break;
630     }
631 }
632
633 /**
634  * Initialise stream
635  * @param st Stream to initialise, or NULL to create and initialise new stream
636  * @return NULL on error
637  */
638 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
639 {
640     if (st) {
641         if (st->codec->extradata) {
642             av_freep(&st->codec->extradata);
643             st->codec->extradata_size = 0;
644         }
645     } else {
646         WtvStream *wst = av_mallocz(sizeof(WtvStream));
647         if (!wst)
648             return NULL;
649         st = avformat_new_stream(s, NULL);
650         if (!st)
651             return NULL;
652         st->id = sid;
653         st->priv_data = wst;
654     }
655     st->codec->codec_type = codec_type;
656     st->need_parsing      = AVSTREAM_PARSE_FULL;
657     avpriv_set_pts_info(st, 64, 1, 10000000);
658     return st;
659 }
660
661 /**
662  * parse Media Type structure and populate stream
663  * @param st         Stream, or NULL to create new stream
664  * @param mediatype  Mediatype GUID
665  * @param subtype    Subtype GUID
666  * @param formattype Format GUID
667  * @param size       Size of format buffer
668  * @return NULL on error
669  */
670 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
671                                    ff_asf_guid mediatype, ff_asf_guid subtype,
672                                    ff_asf_guid formattype, int size)
673 {
674     WtvContext *wtv = s->priv_data;
675     AVIOContext *pb = wtv->pb;
676     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
677         !ff_guidcmp(formattype, format_cpfilters_processed)) {
678         ff_asf_guid actual_subtype;
679         ff_asf_guid actual_formattype;
680
681         if (size < 32) {
682             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
683             avio_skip(pb, size);
684             return NULL;
685         }
686
687         avio_skip(pb, size - 32);
688         ff_get_guid(pb, &actual_subtype);
689         ff_get_guid(pb, &actual_formattype);
690         avio_seek(pb, -size, SEEK_CUR);
691
692         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
693         avio_skip(pb, 32);
694         return st;
695     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
696         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
697         if (!st)
698             return NULL;
699         if (!ff_guidcmp(formattype, format_waveformatex)) {
700             int ret = ff_get_wav_header(pb, st->codec, size);
701             if (ret < 0)
702                 return NULL;
703         } else {
704             if (ff_guidcmp(formattype, format_none))
705                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
706             avio_skip(pb, size);
707         }
708
709         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
710             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
711         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
712             if (st->codec->extradata && st->codec->extradata_size >= 22)
713                 parse_mpeg1waveformatex(st);
714             else
715                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
716         } else {
717             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
718             if (st->codec->codec_id == AV_CODEC_ID_NONE)
719                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
720         }
721         return st;
722     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
723         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
724         if (!st)
725             return NULL;
726         if (!ff_guidcmp(formattype, format_videoinfo2)) {
727             int consumed = parse_videoinfoheader2(s, st);
728             avio_skip(pb, FFMAX(size - consumed, 0));
729         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
730             int consumed = parse_videoinfoheader2(s, st);
731             avio_skip(pb, FFMAX(size - consumed, 0));
732         } else {
733             if (ff_guidcmp(formattype, format_none))
734                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
735             avio_skip(pb, size);
736         }
737
738         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
739             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
740         } else {
741             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
742         }
743         if (st->codec->codec_id == AV_CODEC_ID_NONE)
744             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
745         return st;
746     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
747                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
748         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
749         if (!st)
750             return NULL;
751         if (ff_guidcmp(formattype, format_none))
752             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
753         avio_skip(pb, size);
754         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
755         return st;
756     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
757                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
758         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
759         if (!st)
760             return NULL;
761         if (ff_guidcmp(formattype, format_none))
762             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
763         avio_skip(pb, size);
764         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
765         return st;
766     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
767                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
768         if (ff_guidcmp(formattype, format_none))
769             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
770         avio_skip(pb, size);
771         return NULL;
772     }
773
774     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
775                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
776                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
777     avio_skip(pb, size);
778     return NULL;
779 }
780
781 enum {
782     SEEK_TO_DATA = 0,
783     SEEK_TO_PTS,
784 };
785
786 /**
787  * Parse WTV chunks
788  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
789  * @param seekts timestamp
790  * @param[out] len_ptr Length of data chunk
791  * @return stream index of data chunk, or <0 on error
792  */
793 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
794 {
795     WtvContext *wtv = s->priv_data;
796     AVIOContext *pb = wtv->pb;
797     while (!pb->eof_reached) {
798         ff_asf_guid g;
799         int len, sid, consumed;
800
801         ff_get_guid(pb, &g);
802         len = avio_rl32(pb);
803         if (len < 32)
804             break;
805         sid = avio_rl32(pb) & 0x7FFF;
806         avio_skip(pb, 8);
807         consumed = 32;
808
809         if (!ff_guidcmp(g, stream_guid)) {
810             if (ff_find_stream_index(s, sid) < 0) {
811                 ff_asf_guid mediatype, subtype, formattype;
812                 int size;
813                 avio_skip(pb, 28);
814                 ff_get_guid(pb, &mediatype);
815                 ff_get_guid(pb, &subtype);
816                 avio_skip(pb, 12);
817                 ff_get_guid(pb, &formattype);
818                 size = avio_rl32(pb);
819                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
820                 consumed += 92 + size;
821             }
822         } else if (!ff_guidcmp(g, stream2_guid)) {
823             int stream_index = ff_find_stream_index(s, sid);
824             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
825                 ff_asf_guid mediatype, subtype, formattype;
826                 int size;
827                 avio_skip(pb, 12);
828                 ff_get_guid(pb, &mediatype);
829                 ff_get_guid(pb, &subtype);
830                 avio_skip(pb, 12);
831                 ff_get_guid(pb, &formattype);
832                 size = avio_rl32(pb);
833                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
834                 consumed += 76 + size;
835             }
836         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
837                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
838                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
839                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
840                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
841                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
842             int stream_index = ff_find_stream_index(s, sid);
843             if (stream_index >= 0) {
844                 AVStream *st = s->streams[stream_index];
845                 uint8_t buf[258];
846                 const uint8_t *pbuf = buf;
847                 int buf_size;
848
849                 avio_skip(pb, 8);
850                 consumed += 8;
851                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
852                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
853                     avio_skip(pb, 6);
854                     consumed += 6;
855                 }
856
857                 buf_size = FFMIN(len - consumed, sizeof(buf));
858                 avio_read(pb, buf, buf_size);
859                 consumed += buf_size;
860                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
861             }
862         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
863             int stream_index = ff_find_stream_index(s, sid);
864             if (stream_index >= 0) {
865                 AVStream *st = s->streams[stream_index];
866                 int audio_type;
867                 avio_skip(pb, 8);
868                 audio_type = avio_r8(pb);
869                 if (audio_type == 2)
870                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
871                 else if (audio_type == 3)
872                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
873                 consumed += 9;
874             }
875         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
876             int stream_index = ff_find_stream_index(s, sid);
877             if (stream_index >= 0) {
878                 avio_skip(pb, 12);
879                 if (avio_rl32(pb))
880                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
881                 consumed += 16;
882             }
883         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
884             int stream_index = ff_find_stream_index(s, sid);
885             if (stream_index >= 0) {
886                 AVStream *st = s->streams[stream_index];
887                 uint8_t language[4];
888                 avio_skip(pb, 12);
889                 avio_read(pb, language, 3);
890                 if (language[0]) {
891                     language[3] = 0;
892                     av_dict_set(&st->metadata, "language", language, 0);
893                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
894                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
895                 }
896                 consumed += 15;
897             }
898         } else if (!ff_guidcmp(g, timestamp_guid)) {
899             int stream_index = ff_find_stream_index(s, sid);
900             if (stream_index >= 0) {
901                 avio_skip(pb, 8);
902                 wtv->pts = avio_rl64(pb);
903                 consumed += 16;
904                 if (wtv->pts == -1)
905                     wtv->pts = AV_NOPTS_VALUE;
906                 else {
907                     wtv->last_valid_pts = wtv->pts;
908                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
909                         wtv->epoch = wtv->pts;
910                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
911 #define WTV_PAD8(x) (((x) + 7) & ~7)
912                     avio_skip(pb, WTV_PAD8(len) - consumed);
913                     return 0;
914                 }
915                 }
916             }
917         } else if (!ff_guidcmp(g, data_guid)) {
918             int stream_index = ff_find_stream_index(s, sid);
919             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
920                 WtvStream *wst = s->streams[stream_index]->priv_data;
921                 wst->seen_data = 1;
922                 if (len_ptr) {
923                     *len_ptr = len;
924                 }
925                 return stream_index;
926             }
927         } else if (
928             !ff_guidcmp(g, /* DSATTRIB_CAPTURE_STREAMTIME */ (const ff_asf_guid){0x14,0x56,0x1A,0x0C,0xCD,0x30,0x40,0x4F,0xBC,0xBF,0xD0,0x3E,0x52,0x30,0x62,0x07}) ||
929             !ff_guidcmp(g, /* DSATTRIB_PicSampleSeq */ (const ff_asf_guid){0x02,0xAE,0x5B,0x2F,0x8F,0x7B,0x60,0x4F,0x82,0xD6,0xE4,0xEA,0x2F,0x1F,0x4C,0x99}) ||
930             !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ (const ff_asf_guid){0x12,0xF6,0x22,0xB6,0xAD,0x47,0x71,0x46,0xAD,0x6C,0x05,0xA9,0x8E,0x65,0xDE,0x3A}) ||
931             !ff_guidcmp(g, /* dvr_ms_vid_frame_rep_data */ (const ff_asf_guid){0xCC,0x32,0x64,0xDD,0x29,0xE2,0xDB,0x40,0x80,0xF6,0xD2,0x63,0x28,0xD2,0x76,0x1F}) ||
932             !ff_guidcmp(g, /* EVENTID_ChannelChangeSpanningEvent */ (const ff_asf_guid){0xE5,0xC5,0x67,0x90,0x5C,0x4C,0x05,0x42,0x86,0xC8,0x7A,0xFE,0x20,0xFE,0x1E,0xFA}) ||
933             !ff_guidcmp(g, /* EVENTID_ChannelInfoSpanningEvent */ (const ff_asf_guid){0x80,0x6D,0xF3,0x41,0x32,0x41,0xC2,0x4C,0xB1,0x21,0x01,0xA4,0x32,0x19,0xD8,0x1B}) ||
934             !ff_guidcmp(g, /* EVENTID_ChannelTypeSpanningEvent */ (const ff_asf_guid){0x51,0x1D,0xAB,0x72,0xD2,0x87,0x9B,0x48,0xBA,0x11,0x0E,0x08,0xDC,0x21,0x02,0x43}) ||
935             !ff_guidcmp(g, /* EVENTID_PIDListSpanningEvent */ (const ff_asf_guid){0x65,0x8F,0xFC,0x47,0xBB,0xE2,0x34,0x46,0x9C,0xEF,0xFD,0xBF,0xE6,0x26,0x1D,0x5C}) ||
936             !ff_guidcmp(g, /* EVENTID_SignalAndServiceStatusSpanningEvent */ (const ff_asf_guid){0xCB,0xC5,0x68,0x80,0x04,0x3C,0x2B,0x49,0xB4,0x7D,0x03,0x08,0x82,0x0D,0xCE,0x51}) ||
937             !ff_guidcmp(g, /* EVENTID_StreamTypeSpanningEvent */ (const ff_asf_guid){0xBC,0x2E,0xAF,0x82,0xA6,0x30,0x64,0x42,0xA8,0x0B,0xAD,0x2E,0x13,0x72,0xAC,0x60}) ||
938             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
939             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
940             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
941             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
942             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
943             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
944             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
945             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
946             //ignore known guids
947         } else
948             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
949
950         avio_skip(pb, WTV_PAD8(len) - consumed);
951     }
952     return AVERROR_EOF;
953 }
954
955 /* declare utf16le strings */
956 #define _ , 0,
957 static const uint8_t timeline_le16[] =
958     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
959 static const uint8_t table_0_entries_legacy_attrib_le16[] =
960     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
961 static const uint8_t table_0_entries_time_le16[] =
962     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
963 static const uint8_t timeline_table_0_entries_Events_le16[] =
964     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};
965 #undef _
966
967 static int read_header(AVFormatContext *s)
968 {
969     WtvContext *wtv = s->priv_data;
970     int root_sector, root_size;
971     uint8_t root[WTV_SECTOR_SIZE];
972     AVIOContext *pb;
973     int64_t timeline_pos;
974     int ret;
975
976     wtv->epoch          =
977     wtv->pts            =
978     wtv->last_valid_pts = AV_NOPTS_VALUE;
979
980     /* read root directory sector */
981     avio_skip(s->pb, 0x30);
982     root_size = avio_rl32(s->pb);
983     if (root_size > sizeof(root)) {
984         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
985         return AVERROR_INVALIDDATA;
986     }
987     avio_skip(s->pb, 4);
988     root_sector = avio_rl32(s->pb);
989
990     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
991     root_size = avio_read(s->pb, root, root_size);
992     if (root_size < 0)
993         return AVERROR_INVALIDDATA;
994
995     /* parse chunks up until first data chunk */
996     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
997     if (!wtv->pb) {
998         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
999         return AVERROR_INVALIDDATA;
1000     }
1001
1002     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
1003     if (ret < 0)
1004         return ret;
1005     avio_seek(wtv->pb, -32, SEEK_CUR);
1006
1007     timeline_pos = avio_tell(s->pb); // save before opening another file
1008
1009     /* read metadata */
1010     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
1011     if (pb) {
1012         parse_legacy_attrib(s, pb);
1013         wtvfile_close(pb);
1014     }
1015
1016     /* read seek index */
1017     if (s->nb_streams) {
1018         AVStream *st = s->streams[0];
1019         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1020         if (pb) {
1021             while(1) {
1022                 uint64_t timestamp = avio_rl64(pb);
1023                 uint64_t frame_nb  = avio_rl64(pb);
1024                 if (pb->eof_reached)
1025                     break;
1026                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1027                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1028             }
1029             wtvfile_close(pb);
1030
1031             if (wtv->nb_index_entries) {
1032                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1033                 if (pb) {
1034                     int i;
1035                     while (1) {
1036                         uint64_t frame_nb = avio_rl64(pb);
1037                         uint64_t position = avio_rl64(pb);
1038                         if (pb->eof_reached)
1039                             break;
1040                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1041                             AVIndexEntry *e = wtv->index_entries + i;
1042                             if (frame_nb > e->size)
1043                                 break;
1044                             if (position > e->pos)
1045                                 e->pos = position;
1046                         }
1047                     }
1048                     wtvfile_close(pb);
1049                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1050                 }
1051             }
1052         }
1053     }
1054
1055     avio_seek(s->pb, timeline_pos, SEEK_SET);
1056     return 0;
1057 }
1058
1059 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1060 {
1061     WtvContext *wtv = s->priv_data;
1062     AVIOContext *pb = wtv->pb;
1063     int stream_index, len, ret;
1064
1065     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1066     if (stream_index < 0)
1067         return stream_index;
1068
1069     ret = av_get_packet(pb, pkt, len - 32);
1070     if (ret < 0)
1071         return ret;
1072     pkt->stream_index = stream_index;
1073     pkt->pts          = wtv->pts;
1074     avio_skip(pb, WTV_PAD8(len) - len);
1075     return 0;
1076 }
1077
1078 static int read_seek(AVFormatContext *s, int stream_index,
1079                      int64_t ts, int flags)
1080 {
1081     WtvContext *wtv = s->priv_data;
1082     AVIOContext *pb = wtv->pb;
1083     AVStream *st = s->streams[0];
1084     int64_t ts_relative;
1085     int i;
1086
1087     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1088         return AVERROR(ENOSYS);
1089
1090     /* timestamp adjustment is required because wtv->pts values are absolute,
1091      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1092     ts_relative = ts;
1093     if (wtv->epoch != AV_NOPTS_VALUE)
1094         ts_relative -= wtv->epoch;
1095
1096     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1097     if (i < 0) {
1098         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1099             avio_seek(pb, 0, SEEK_SET);
1100         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1101             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1102         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1103             return AVERROR(ERANGE);
1104         return 0;
1105     }
1106     wtv->pts = wtv->index_entries[i].timestamp;
1107     if (wtv->epoch != AV_NOPTS_VALUE)
1108         wtv->pts += wtv->epoch;
1109     wtv->last_valid_pts = wtv->pts;
1110     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1111     return 0;
1112 }
1113
1114 static int read_close(AVFormatContext *s)
1115 {
1116     WtvContext *wtv = s->priv_data;
1117     av_free(wtv->index_entries);
1118     wtvfile_close(wtv->pb);
1119     return 0;
1120 }
1121
1122 AVInputFormat ff_wtv_demuxer = {
1123     .name           = "wtv",
1124     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1125     .priv_data_size = sizeof(WtvContext),
1126     .read_probe     = read_probe,
1127     .read_header    = read_header,
1128     .read_packet    = read_packet,
1129     .read_seek      = read_seek,
1130     .read_close     = read_close,
1131     .flags          = AVFMT_SHOW_IDS,
1132 };