wtv: parse MPEG2 descriptor events
[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_StreamIDSpanningEvent =
89     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
90 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
91     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
92
93 /* Windows media GUIDs */
94
95 #define MEDIASUBTYPE_BASE_GUID \
96     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
97
98 /* Media types */
99 static const ff_asf_guid mediatype_audio =
100     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
101 static const ff_asf_guid mediatype_video =
102     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
103 static const ff_asf_guid mediasubtype_mpeg1payload =
104     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
105 static const ff_asf_guid mediatype_mpeg2_sections =
106     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
107 static const ff_asf_guid mediatype_mpeg2_pes =
108     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
109 static const ff_asf_guid mediatype_mstvcaption =
110     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
111
112 /* Media subtypes */
113 static const ff_asf_guid mediasubtype_cpfilters_processed =
114     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
115 static const ff_asf_guid mediasubtype_dvb_subtitle =
116     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
117 static const ff_asf_guid mediasubtype_teletext =
118     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
119 static const ff_asf_guid mediasubtype_dtvccdata =
120     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
121 static const ff_asf_guid mediasubtype_mpeg2_sections =
122     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
123
124 /* Formats */
125 static const ff_asf_guid format_cpfilters_processed =
126     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
127 static const ff_asf_guid format_waveformatex =
128     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
129 static const ff_asf_guid format_videoinfo2 =
130     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
131 static const ff_asf_guid format_mpeg2_video =
132     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
133 static const ff_asf_guid format_none =
134     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
135
136 static const AVCodecGuid video_guids[] = {
137     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
138     {CODEC_ID_NONE}
139 };
140
141 static const AVCodecGuid audio_guids[] = {
142     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
143     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
144     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
145     {CODEC_ID_NONE}
146 };
147
148 static int read_probe(AVProbeData *p)
149 {
150     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
151 }
152
153 /**
154  * parse VIDEOINFOHEADER2 structure
155  * @return bytes consumed
156  */
157 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
158 {
159     ByteIOContext *pb = s->pb;
160
161     url_fskip(pb, 32);
162     st->codec->bit_rate = get_le32(pb);
163     url_fskip(pb, 20);
164     st->sample_aspect_ratio.num = get_le32(pb);
165     st->sample_aspect_ratio.den = get_le32(pb);
166     url_fskip(pb, 8);
167     ff_get_bmp_header(pb, st);
168
169     return 72 + 40;
170 }
171
172 /**
173  * Parse MPEG1WAVEFORMATEX extradata structure
174  */
175 static void parse_mpeg1waveformatex(AVStream *st)
176 {
177     /* fwHeadLayer */
178     switch (AV_RL16(st->codec->extradata)) {
179     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
180     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
181     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
182     }
183
184     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
185
186     /* dwHeadMode */
187     switch (AV_RL16(st->codec->extradata + 6)) {
188     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
189     case 8 :                   st->codec->channels = 1; break;
190     }
191 }
192
193 static AVStream * new_stream(AVFormatContext *s, int sid, int codec_type)
194 {
195     AVStream * st = av_new_stream(s, sid);
196     if (!st)
197         return NULL;
198     st->codec->codec_type = codec_type;
199     st->need_parsing      = AVSTREAM_PARSE_FULL;
200     av_set_pts_info(st, 64, 1, 10000000);
201     return st;
202 }
203
204 /**
205  * parse Media Type structure and create new streams as required
206  * @param mediatype  Mediatype GUID
207  * @param subtype    Subtype GUID
208  * @param formattype Format GUID
209  * @param size       Size of format buffer
210  * @return NULL on error
211  */
212 static AVStream * parse_media_type(AVFormatContext *s, int sid,
213                                    ff_asf_guid mediatype, ff_asf_guid subtype,
214                                    ff_asf_guid formattype, int size)
215 {
216     ByteIOContext *pb = s->pb;
217     AVStream *st;
218     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
219         !ff_guidcmp(formattype, format_cpfilters_processed)) {
220         ff_asf_guid actual_subtype;
221         ff_asf_guid actual_formattype;
222
223         if (size < 32) {
224             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
225             url_fskip(pb, size);
226             return NULL;
227         }
228
229         url_fskip(pb, size - 32);
230         ff_get_guid(pb, &actual_subtype);
231         ff_get_guid(pb, &actual_formattype);
232         url_fseek(pb, -size, SEEK_CUR);
233
234         st = parse_media_type(s, sid, mediatype, actual_subtype, actual_formattype, size - 32);
235         url_fskip(pb, 32);
236         return st;
237     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
238         st = new_stream(s, sid, AVMEDIA_TYPE_AUDIO);
239         if (!st)
240             return NULL;
241         if (!ff_guidcmp(formattype, format_waveformatex)) {
242             ff_get_wav_header(pb, st->codec, size);
243         } else {
244             if (ff_guidcmp(formattype, format_none))
245                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
246             url_fskip(pb, size);
247         }
248
249         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
250             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
251         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
252             if (st->codec->extradata && st->codec->extradata_size >= 22)
253                 parse_mpeg1waveformatex(st);
254             else
255                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
256         } else {
257             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
258             if (st->codec->codec_id == CODEC_ID_NONE)
259                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
260         }
261         return st;
262     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
263         st = new_stream(s, sid, AVMEDIA_TYPE_VIDEO);
264         if (!st)
265             return NULL;
266         if (!ff_guidcmp(formattype, format_videoinfo2)) {
267             int consumed = parse_videoinfoheader2(s, st);
268             url_fskip(pb, FFMAX(size - consumed, 0));
269         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
270             int consumed = parse_videoinfoheader2(s, st);
271             url_fskip(pb, FFMAX(size - consumed, 0));
272         } else {
273             if (ff_guidcmp(formattype, format_none))
274                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
275             url_fskip(pb, size);
276         }
277
278         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
279             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
280         } else {
281             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
282         }
283         if (st->codec->codec_id == CODEC_ID_NONE)
284             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
285         return st;
286     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
287                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
288         st = new_stream(s, sid, AVMEDIA_TYPE_SUBTITLE);
289         if (!st)
290             return NULL;
291         if (ff_guidcmp(formattype, format_none))
292             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
293         url_fskip(pb, size);
294         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
295         return st;
296     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
297                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
298         st = new_stream(s, sid, AVMEDIA_TYPE_SUBTITLE);
299         if (!st)
300             return NULL;
301         if (ff_guidcmp(formattype, format_none))
302             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
303         url_fskip(pb, size);
304         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
305         return st;
306     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
307                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
308         if (ff_guidcmp(formattype, format_none))
309             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
310         url_fskip(pb, size);
311         return NULL;
312     }
313
314     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
315                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
316                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
317     url_fskip(pb, size);
318     return NULL;
319 }
320
321 enum {
322     SEEK_TO_DATA = 0,
323     SEEK_TO_BYTE,
324     SEEK_TO_PTS,
325 };
326
327 /**
328  * Parse WTV chunks
329  * @param mode SEEK_TO_DATA, SEEK_TO_BYTE, SEEK_TO_PTS
330  * @param seekts either byte position or timestamp
331  * @param[out] len Length of data chunk
332  * @return stream index of data chunk, or <0 on error
333  */
334 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
335 {
336     WtvContext *wtv = s->priv_data;
337     ByteIOContext *pb = s->pb;
338     while (!url_feof(pb)) {
339         ff_asf_guid g;
340         int len, sid, consumed;
341
342         if (mode == SEEK_TO_BYTE && url_ftell(pb) >= seekts)
343             return 0;
344
345         ff_get_guid(pb, &g);
346         if (is_zero(g, sizeof(ff_asf_guid)))
347             return AVERROR_EOF;
348
349         len = get_le32(pb);
350         sid = get_le32(pb) & 0x7FFF;
351         url_fskip(pb, 8);
352         consumed = 32;
353
354         if (!ff_guidcmp(g, stream_guid)) {
355             if (ff_find_stream_index(s, sid) < 0) {
356                 ff_asf_guid mediatype, subtype, formattype;
357                 int size;
358                 consumed += 20;
359                 url_fskip(pb, 16);
360                 if (get_le32(pb)) {
361                     url_fskip(pb, 8);
362                     ff_get_guid(pb, &mediatype);
363                     ff_get_guid(pb, &subtype);
364                     url_fskip(pb, 12);
365                     ff_get_guid(pb, &formattype);
366                     size = get_le32(pb);
367                     parse_media_type(s, sid, mediatype, subtype, formattype, size);
368                     consumed += 72 + size;
369                 }
370             }
371         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
372                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
373                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
374                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
375                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
376                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
377             int stream_index = ff_find_stream_index(s, sid);
378             if (stream_index >= 0) {
379                 AVStream *st = s->streams[stream_index];
380                 uint8_t buf[258];
381                 const uint8_t *pbuf = buf;
382                 int buf_size;
383
384                 url_fskip(pb, 8);
385                 consumed += 8;
386                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
387                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
388                     url_fskip(pb, 6);
389                     consumed += 6;
390                 }
391
392                 buf_size = FFMIN(len - consumed, sizeof(buf));
393                 get_buffer(pb, buf, buf_size);
394                 consumed += buf_size;
395                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
396             }
397         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
398             int stream_index = ff_find_stream_index(s, sid);
399             if (stream_index >= 0) {
400                 AVStream *st = s->streams[stream_index];
401                 uint8_t language[4];
402                 url_fskip(pb, 12);
403                 get_buffer(pb, language, 3);
404                 if (language[0]) {
405                     language[3] = 0;
406                     av_metadata_set2(&st->metadata, "language", language, 0);
407                 }
408                 consumed += 15;
409             }
410         } else if (!ff_guidcmp(g, timestamp_guid)) {
411             url_fskip(pb, 8);
412             wtv->pts = get_le64(pb);
413             consumed += 16;
414             if (wtv->pts == -1)
415                 wtv->pts = AV_NOPTS_VALUE;
416             if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
417 #define WTV_PAD8(x) (((x) + 7) & ~7)
418                 url_fskip(pb, WTV_PAD8(len) - consumed);
419                 return 0;
420             }
421         } else if (!ff_guidcmp(g, data_guid)) {
422             int stream_index = ff_find_stream_index(s, sid);
423             if (mode == SEEK_TO_DATA && stream_index >= 0) {
424                 if (len_ptr) {
425                     *len_ptr = len;
426                 }
427                 if (wtv->pts != AV_NOPTS_VALUE)
428                     av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);
429                 return stream_index;
430             }
431         } else if (
432             !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}) ||
433             !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}) ||
434             !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}) ||
435             !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}) ||
436             !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}) ||
437             !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}) ||
438             !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}) ||
439             !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}) ||
440             !ff_guidcmp(g, /* EVENTID_DVBScramblingControlSpanningEvent */ (const ff_asf_guid){0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B}) ||
441             !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}) ||
442             !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}) ||
443             !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}) ||
444             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
445             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
446             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
447             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
448             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
449             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
450             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
451             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
452             !ff_guidcmp(g, (const ff_asf_guid){0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
453             //ignore known guids
454         } else
455             av_log(s, AV_LOG_WARNING, "unsuported chunk:"PRI_GUID"\n", ARG_GUID(g));
456
457         url_fskip(pb, WTV_PAD8(len) - consumed);
458     }
459     return AVERROR_EOF;
460 }
461
462 #define WTV_CHUNK_START 0x40000
463
464 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
465 {
466     ByteIOContext *pb = s->pb;
467     int ret;
468
469     url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
470     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
471     if (ret < 0)
472         return ret;
473
474     url_fseek(pb, -32, SEEK_CUR);
475     return 0;
476 }
477
478 static int read_packet(AVFormatContext *s, AVPacket *pkt)
479 {
480     WtvContext *wtv = s->priv_data;
481     ByteIOContext *pb = s->pb;
482     int stream_index, len, ret;
483
484     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
485     if (stream_index < 0)
486         return stream_index;
487
488     ret = av_get_packet(pb, pkt, len - 32);
489     if (ret < 0)
490         return ret;
491     pkt->stream_index = stream_index;
492     pkt->pts          = wtv->pts;
493     url_fskip(pb, WTV_PAD8(len) - len);
494     return 0;
495 }
496
497 static int read_seek2(AVFormatContext *s, int stream_index,
498                       int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
499 {
500     WtvContext *wtv = s->priv_data;
501     ByteIOContext *pb = s->pb;
502     AVStream *st;
503     int i;
504
505     if (stream_index < 0) {
506         stream_index = av_find_default_stream_index(s);
507         if (stream_index < 0)
508             return -1;
509     }
510     st = s->streams[stream_index];
511
512     if ((flags & AVSEEK_FLAG_FRAME)) {
513         return AVERROR_NOTSUPP;
514     } else if ((flags & AVSEEK_FLAG_BYTE)) {
515         if (ts < url_ftell(pb)) {
516             for (i = st->nb_index_entries - 1; i >= 0; i--) {
517                 if (st->index_entries[i].pos <= ts) {
518                     wtv->pts    = st->index_entries[i].timestamp;
519                     url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
520                     break;
521                 }
522             }
523             if (i < 0) {
524                 wtv->pts = 0;
525                 url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
526             }
527         }
528         if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)
529             return AVERROR(ERANGE);
530         return 0;
531     } else {
532         ts *= 10;
533         i = av_index_search_timestamp(st, ts, flags);
534         if (i < 0) {
535             if (st->nb_index_entries > 0) {
536                 wtv->pts    = st->index_entries[st->nb_index_entries - 1].timestamp;
537                 url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);
538             } else {
539                 wtv->pts = 0;
540                 url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
541             }
542             if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
543                 return AVERROR(ERANGE);
544             return 0;
545         }
546         wtv->pts    = st->index_entries[i].timestamp;
547         url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
548         return 0;
549     }
550 }
551
552 AVInputFormat wtv_demuxer = {
553     .name           = "wtv",
554     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
555     .priv_data_size = sizeof(WtvContext),
556     .read_probe     = read_probe,
557     .read_header    = read_header,
558     .read_packet    = read_packet,
559     .read_seek2     = read_seek2,
560     .flags          = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
561 };