wtv: display warning if scrambled stream is detected
[ffmpeg.git] / libavformat / wtv.c
1 /*
2  * Windows Television (WTV) demuxer
3  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /**
23  * @file
24  * Windows Television (WTV) demuxer
25  * @author Peter Ross <pross@xvid.org>
26  */
27
28 #include "libavutil/intreadwrite.h"
29 #include "avformat.h"
30 #include "riff.h"
31 #include "asf.h"
32 #include "mpegts.h"
33
34 /* Macros for formating GUIDs */
35 #define PRI_GUID \
36     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
37 #define ARG_GUID(g) \
38     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]
39
40 typedef struct WtvContext {
41     uint64_t pts;
42 } WtvContext;
43
44 static int is_zero(uint8_t *v, int n)
45 {
46    int i;
47    for (i = 0; i < n; i++)
48       if (v[i]) return 0;
49    return 1;
50 }
51
52 typedef struct {
53     enum CodecID id;
54     ff_asf_guid guid;
55 } AVCodecGuid;
56
57 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
58 {
59     int i;
60     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
61         if (!ff_guidcmp(guids[i].guid, guid))
62             return guids[i].id;
63     }
64     return CODEC_ID_NONE;
65 }
66
67 /* WTV GUIDs */
68 static const ff_asf_guid wtv_guid =
69     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
70 static const ff_asf_guid meta_guid =
71     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
72 static const ff_asf_guid timestamp_guid =
73     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
74 static const ff_asf_guid data_guid =
75     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
76 static const ff_asf_guid stream_guid =
77     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
78 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
79     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
80 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
81     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
82 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
83     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
84 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
85     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
86 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
87     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
88 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
89     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
90 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
91     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
92 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
93     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
94
95 /* Windows media GUIDs */
96
97 #define MEDIASUBTYPE_BASE_GUID \
98     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
99
100 /* Media types */
101 static const ff_asf_guid mediatype_audio =
102     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
103 static const ff_asf_guid mediatype_video =
104     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
105 static const ff_asf_guid mediasubtype_mpeg1payload =
106     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
107 static const ff_asf_guid mediatype_mpeg2_sections =
108     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
109 static const ff_asf_guid mediatype_mpeg2_pes =
110     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
111 static const ff_asf_guid mediatype_mstvcaption =
112     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
113
114 /* Media subtypes */
115 static const ff_asf_guid mediasubtype_cpfilters_processed =
116     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
117 static const ff_asf_guid mediasubtype_dvb_subtitle =
118     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
119 static const ff_asf_guid mediasubtype_teletext =
120     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
121 static const ff_asf_guid mediasubtype_dtvccdata =
122     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
123 static const ff_asf_guid mediasubtype_mpeg2_sections =
124     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
125
126 /* Formats */
127 static const ff_asf_guid format_cpfilters_processed =
128     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
129 static const ff_asf_guid format_waveformatex =
130     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
131 static const ff_asf_guid format_videoinfo2 =
132     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
133 static const ff_asf_guid format_mpeg2_video =
134     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
135 static const ff_asf_guid format_none =
136     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
137
138 static const AVCodecGuid video_guids[] = {
139     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
140     {CODEC_ID_NONE}
141 };
142
143 static const AVCodecGuid audio_guids[] = {
144     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
145     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
146     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
147     {CODEC_ID_NONE}
148 };
149
150 static int read_probe(AVProbeData *p)
151 {
152     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
153 }
154
155 /**
156  * parse VIDEOINFOHEADER2 structure
157  * @return bytes consumed
158  */
159 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
160 {
161     ByteIOContext *pb = s->pb;
162
163     url_fskip(pb, 32);
164     st->codec->bit_rate = get_le32(pb);
165     url_fskip(pb, 20);
166     st->sample_aspect_ratio.num = get_le32(pb);
167     st->sample_aspect_ratio.den = get_le32(pb);
168     url_fskip(pb, 8);
169     ff_get_bmp_header(pb, st);
170
171     return 72 + 40;
172 }
173
174 /**
175  * Parse MPEG1WAVEFORMATEX extradata structure
176  */
177 static void parse_mpeg1waveformatex(AVStream *st)
178 {
179     /* fwHeadLayer */
180     switch (AV_RL16(st->codec->extradata)) {
181     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
182     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
183     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
184     }
185
186     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
187
188     /* dwHeadMode */
189     switch (AV_RL16(st->codec->extradata + 6)) {
190     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
191     case 8 :                   st->codec->channels = 1; break;
192     }
193 }
194
195 static AVStream * new_stream(AVFormatContext *s, int sid, int codec_type)
196 {
197     AVStream * st = av_new_stream(s, sid);
198     if (!st)
199         return NULL;
200     st->codec->codec_type = codec_type;
201     st->need_parsing      = AVSTREAM_PARSE_FULL;
202     av_set_pts_info(st, 64, 1, 10000000);
203     return st;
204 }
205
206 /**
207  * parse Media Type structure and create new streams as required
208  * @param mediatype  Mediatype GUID
209  * @param subtype    Subtype GUID
210  * @param formattype Format GUID
211  * @param size       Size of format buffer
212  * @return NULL on error
213  */
214 static AVStream * parse_media_type(AVFormatContext *s, int sid,
215                                    ff_asf_guid mediatype, ff_asf_guid subtype,
216                                    ff_asf_guid formattype, int size)
217 {
218     ByteIOContext *pb = s->pb;
219     AVStream *st;
220     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
221         !ff_guidcmp(formattype, format_cpfilters_processed)) {
222         ff_asf_guid actual_subtype;
223         ff_asf_guid actual_formattype;
224
225         if (size < 32) {
226             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
227             url_fskip(pb, size);
228             return NULL;
229         }
230
231         url_fskip(pb, size - 32);
232         ff_get_guid(pb, &actual_subtype);
233         ff_get_guid(pb, &actual_formattype);
234         url_fseek(pb, -size, SEEK_CUR);
235
236         st = parse_media_type(s, sid, mediatype, actual_subtype, actual_formattype, size - 32);
237         url_fskip(pb, 32);
238         return st;
239     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
240         st = new_stream(s, sid, AVMEDIA_TYPE_AUDIO);
241         if (!st)
242             return NULL;
243         if (!ff_guidcmp(formattype, format_waveformatex)) {
244             ff_get_wav_header(pb, st->codec, size);
245         } else {
246             if (ff_guidcmp(formattype, format_none))
247                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
248             url_fskip(pb, size);
249         }
250
251         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
252             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
253         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
254             if (st->codec->extradata && st->codec->extradata_size >= 22)
255                 parse_mpeg1waveformatex(st);
256             else
257                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
258         } else {
259             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
260             if (st->codec->codec_id == CODEC_ID_NONE)
261                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
262         }
263         return st;
264     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
265         st = new_stream(s, sid, AVMEDIA_TYPE_VIDEO);
266         if (!st)
267             return NULL;
268         if (!ff_guidcmp(formattype, format_videoinfo2)) {
269             int consumed = parse_videoinfoheader2(s, st);
270             url_fskip(pb, FFMAX(size - consumed, 0));
271         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
272             int consumed = parse_videoinfoheader2(s, st);
273             url_fskip(pb, FFMAX(size - consumed, 0));
274         } else {
275             if (ff_guidcmp(formattype, format_none))
276                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
277             url_fskip(pb, size);
278         }
279
280         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
281             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
282         } else {
283             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
284         }
285         if (st->codec->codec_id == CODEC_ID_NONE)
286             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
287         return st;
288     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
289                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
290         st = new_stream(s, sid, AVMEDIA_TYPE_SUBTITLE);
291         if (!st)
292             return NULL;
293         if (ff_guidcmp(formattype, format_none))
294             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
295         url_fskip(pb, size);
296         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
297         return st;
298     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
299                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
300         st = new_stream(s, sid, AVMEDIA_TYPE_SUBTITLE);
301         if (!st)
302             return NULL;
303         if (ff_guidcmp(formattype, format_none))
304             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
305         url_fskip(pb, size);
306         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
307         return st;
308     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
309                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
310         if (ff_guidcmp(formattype, format_none))
311             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
312         url_fskip(pb, size);
313         return NULL;
314     }
315
316     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
317                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
318                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
319     url_fskip(pb, size);
320     return NULL;
321 }
322
323 enum {
324     SEEK_TO_DATA = 0,
325     SEEK_TO_BYTE,
326     SEEK_TO_PTS,
327 };
328
329 /**
330  * Parse WTV chunks
331  * @param mode SEEK_TO_DATA, SEEK_TO_BYTE, SEEK_TO_PTS
332  * @param seekts either byte position or timestamp
333  * @param[out] len Length of data chunk
334  * @return stream index of data chunk, or <0 on error
335  */
336 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
337 {
338     WtvContext *wtv = s->priv_data;
339     ByteIOContext *pb = s->pb;
340     while (!url_feof(pb)) {
341         ff_asf_guid g;
342         int len, sid, consumed;
343
344         if (mode == SEEK_TO_BYTE && url_ftell(pb) >= seekts)
345             return 0;
346
347         ff_get_guid(pb, &g);
348         if (is_zero(g, sizeof(ff_asf_guid)))
349             return AVERROR_EOF;
350
351         len = get_le32(pb);
352         sid = get_le32(pb) & 0x7FFF;
353         url_fskip(pb, 8);
354         consumed = 32;
355
356         if (!ff_guidcmp(g, stream_guid)) {
357             if (ff_find_stream_index(s, sid) < 0) {
358                 ff_asf_guid mediatype, subtype, formattype;
359                 int size;
360                 consumed += 20;
361                 url_fskip(pb, 16);
362                 if (get_le32(pb)) {
363                     url_fskip(pb, 8);
364                     ff_get_guid(pb, &mediatype);
365                     ff_get_guid(pb, &subtype);
366                     url_fskip(pb, 12);
367                     ff_get_guid(pb, &formattype);
368                     size = get_le32(pb);
369                     parse_media_type(s, sid, mediatype, subtype, formattype, size);
370                     consumed += 72 + size;
371                 }
372             }
373         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
374                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
375                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
376                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
377                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
378                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
379             int stream_index = ff_find_stream_index(s, sid);
380             if (stream_index >= 0) {
381                 AVStream *st = s->streams[stream_index];
382                 uint8_t buf[258];
383                 const uint8_t *pbuf = buf;
384                 int buf_size;
385
386                 url_fskip(pb, 8);
387                 consumed += 8;
388                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
389                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
390                     url_fskip(pb, 6);
391                     consumed += 6;
392                 }
393
394                 buf_size = FFMIN(len - consumed, sizeof(buf));
395                 get_buffer(pb, buf, buf_size);
396                 consumed += buf_size;
397                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
398             }
399         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
400             int stream_index = ff_find_stream_index(s, sid);
401             if (stream_index >= 0) {
402                 url_fskip(pb, 12);
403                 if (get_le32(pb))
404                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
405                 consumed += 16;
406             }
407         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
408             int stream_index = ff_find_stream_index(s, sid);
409             if (stream_index >= 0) {
410                 AVStream *st = s->streams[stream_index];
411                 uint8_t language[4];
412                 url_fskip(pb, 12);
413                 get_buffer(pb, language, 3);
414                 if (language[0]) {
415                     language[3] = 0;
416                     av_metadata_set2(&st->metadata, "language", language, 0);
417                 }
418                 consumed += 15;
419             }
420         } else if (!ff_guidcmp(g, timestamp_guid)) {
421             url_fskip(pb, 8);
422             wtv->pts = get_le64(pb);
423             consumed += 16;
424             if (wtv->pts == -1)
425                 wtv->pts = AV_NOPTS_VALUE;
426             if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
427 #define WTV_PAD8(x) (((x) + 7) & ~7)
428                 url_fskip(pb, WTV_PAD8(len) - consumed);
429                 return 0;
430             }
431         } else if (!ff_guidcmp(g, data_guid)) {
432             int stream_index = ff_find_stream_index(s, sid);
433             if (mode == SEEK_TO_DATA && stream_index >= 0) {
434                 if (len_ptr) {
435                     *len_ptr = len;
436                 }
437                 if (wtv->pts != AV_NOPTS_VALUE)
438                     av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);
439                 return stream_index;
440             }
441         } else if (
442             !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}) ||
443             !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}) ||
444             !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}) ||
445             !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}) ||
446             !ff_guidcmp(g, /* EVENTID_AudioTypeSpanningEvent */ (const ff_asf_guid){0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3}) ||
447             !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}) ||
448             !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}) ||
449             !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}) ||
450             !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}) ||
451             !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}) ||
452             !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}) ||
453             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
454             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
455             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
456             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
457             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
458             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
459             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
460             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
461             !ff_guidcmp(g, (const ff_asf_guid){0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
462             //ignore known guids
463         } else
464             av_log(s, AV_LOG_WARNING, "unsuported chunk:"PRI_GUID"\n", ARG_GUID(g));
465
466         url_fskip(pb, WTV_PAD8(len) - consumed);
467     }
468     return AVERROR_EOF;
469 }
470
471 #define WTV_CHUNK_START 0x40000
472
473 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
474 {
475     ByteIOContext *pb = s->pb;
476     int ret;
477
478     url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
479     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
480     if (ret < 0)
481         return ret;
482
483     url_fseek(pb, -32, SEEK_CUR);
484     return 0;
485 }
486
487 static int read_packet(AVFormatContext *s, AVPacket *pkt)
488 {
489     WtvContext *wtv = s->priv_data;
490     ByteIOContext *pb = s->pb;
491     int stream_index, len, ret;
492
493     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
494     if (stream_index < 0)
495         return stream_index;
496
497     ret = av_get_packet(pb, pkt, len - 32);
498     if (ret < 0)
499         return ret;
500     pkt->stream_index = stream_index;
501     pkt->pts          = wtv->pts;
502     url_fskip(pb, WTV_PAD8(len) - len);
503     return 0;
504 }
505
506 static int read_seek2(AVFormatContext *s, int stream_index,
507                       int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
508 {
509     WtvContext *wtv = s->priv_data;
510     ByteIOContext *pb = s->pb;
511     AVStream *st;
512     int i;
513
514     if (stream_index < 0) {
515         stream_index = av_find_default_stream_index(s);
516         if (stream_index < 0)
517             return -1;
518     }
519     st = s->streams[stream_index];
520
521     if ((flags & AVSEEK_FLAG_FRAME)) {
522         return AVERROR_NOTSUPP;
523     } else if ((flags & AVSEEK_FLAG_BYTE)) {
524         if (ts < url_ftell(pb)) {
525             for (i = st->nb_index_entries - 1; i >= 0; i--) {
526                 if (st->index_entries[i].pos <= ts) {
527                     wtv->pts    = st->index_entries[i].timestamp;
528                     url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
529                     break;
530                 }
531             }
532             if (i < 0) {
533                 wtv->pts = 0;
534                 url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
535             }
536         }
537         if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)
538             return AVERROR(ERANGE);
539         return 0;
540     } else {
541         ts *= 10;
542         i = av_index_search_timestamp(st, ts, flags);
543         if (i < 0) {
544             if (st->nb_index_entries > 0) {
545                 wtv->pts    = st->index_entries[st->nb_index_entries - 1].timestamp;
546                 url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);
547             } else {
548                 wtv->pts = 0;
549                 url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
550             }
551             if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
552                 return AVERROR(ERANGE);
553             return 0;
554         }
555         wtv->pts    = st->index_entries[i].timestamp;
556         url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
557         return 0;
558     }
559 }
560
561 AVInputFormat wtv_demuxer = {
562     .name           = "wtv",
563     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
564     .priv_data_size = sizeof(WtvContext),
565     .read_probe     = read_probe,
566     .read_header    = read_header,
567     .read_packet    = read_packet,
568     .read_seek2     = read_seek2,
569     .flags          = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
570 };