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ffmpeg / libavformat / wtv.c @ 0af1671e

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1
/*
2
 * Windows Television (WTV) demuxer
3
 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
4
 *
5
 * This file is part of FFmpeg.
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 *
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
 *
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 * 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.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/**
23
 * @file
24
 * Windows Television (WTV) demuxer
25
 * @author Peter Ross <pross@xvid.org>
26
 */
27

    
28
#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "riff.h"
31
#include "asf.h"
32

    
33
/* Macros for formating GUIDs */
34
#define PRI_GUID \
35
    "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
36
#define ARG_GUID(g) \
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    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]
38

    
39
typedef struct WtvContext {
40
    uint64_t pts;
41
} WtvContext;
42

    
43
static int is_zero(uint8_t *v, int n)
44
{
45
   int i;
46
   for (i = 0; i < n; i++)
47
      if (v[i]) return 0;
48
   return 1;
49
}
50

    
51
typedef struct {
52
    enum CodecID id;
53
    ff_asf_guid guid;
54
} AVCodecGuid;
55

    
56
static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
57
{
58
    int i;
59
    for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
60
        if (!ff_guidcmp(guids[i].guid, guid))
61
            return guids[i].id;
62
    }
63
    return CODEC_ID_NONE;
64
}
65

    
66
/* WTV GUIDs */
67
static const ff_asf_guid wtv_guid =
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    {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
69
static const ff_asf_guid meta_guid =
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    {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
71
static const ff_asf_guid timestamp_guid =
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    {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
73
static const ff_asf_guid data_guid =
74
    {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
75
static const ff_asf_guid stream_guid =
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    {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
77
static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
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    {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
79
static const ff_asf_guid EVENTID_LanguageSpanningEvent =
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    {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
81

    
82
/* Windows media GUIDs */
83

    
84
#define MEDIASUBTYPE_BASE_GUID \
85
    0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
86

    
87
/* Media types */
88
static const ff_asf_guid mediatype_audio =
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    {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
90
static const ff_asf_guid mediatype_video =
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    {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
92
static const ff_asf_guid mediasubtype_mpeg1payload =
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    {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
94
static const ff_asf_guid mediatype_mpeg2_sections =
95
    {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
96
static const ff_asf_guid mediatype_mpeg2_pes =
97
    {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
98
static const ff_asf_guid mediatype_mstvcaption =
99
    {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
100

    
101
/* Media subtypes */
102
static const ff_asf_guid mediasubtype_cpfilters_processed =
103
    {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
104
static const ff_asf_guid mediasubtype_dvb_subtitle =
105
    {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
106
static const ff_asf_guid mediasubtype_teletext =
107
    {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
108
static const ff_asf_guid mediasubtype_dtvccdata =
109
    {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
110
static const ff_asf_guid mediasubtype_mpeg2_sections =
111
    {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
112

    
113
/* Formats */
114
static const ff_asf_guid format_cpfilters_processed =
115
    {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
116
static const ff_asf_guid format_waveformatex =
117
    {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
118
static const ff_asf_guid format_videoinfo2 =
119
    {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
120
static const ff_asf_guid format_mpeg2_video =
121
    {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
122
static const ff_asf_guid format_none =
123
    {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
124

    
125
static const AVCodecGuid video_guids[] = {
126
    {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
127
    {CODEC_ID_NONE}
128
};
129

    
130
static const AVCodecGuid audio_guids[] = {
131
    {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
132
    {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
133
    {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
134
    {CODEC_ID_NONE}
135
};
136

    
137
static int read_probe(AVProbeData *p)
138
{
139
    return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
140
}
141

    
142
/**
143
 * parse VIDEOINFOHEADER2 structure
144
 * @return bytes consumed
145
 */
146
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
147
{
148
    ByteIOContext *pb = s->pb;
149

    
150
    url_fskip(pb, 32);
151
    st->codec->bit_rate = get_le32(pb);
152
    url_fskip(pb, 20);
153
    st->sample_aspect_ratio.num = get_le32(pb);
154
    st->sample_aspect_ratio.den = get_le32(pb);
155
    url_fskip(pb, 8);
156
    ff_get_bmp_header(pb, st);
157

    
158
    return 72 + 40;
159
}
160

    
161
/**
162
 * Parse MPEG1WAVEFORMATEX extradata structure
163
 */
164
static void parse_mpeg1waveformatex(AVStream *st)
165
{
166
    /* fwHeadLayer */
167
    switch (AV_RL16(st->codec->extradata)) {
168
    case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
169
    case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
170
    case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
171
    }
172

    
173
    st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
174

    
175
    /* dwHeadMode */
176
    switch (AV_RL16(st->codec->extradata + 6)) {
177
    case 1 : case 2 : case 4 : st->codec->channels = 2; break;
178
    case 8 :                   st->codec->channels = 1; break;
179
    }
180
}
181

    
182
static AVStream * new_stream(AVFormatContext *s, int sid, int codec_type)
183
{
184
    AVStream * st = av_new_stream(s, sid);
185
    if (!st)
186
        return NULL;
187
    st->codec->codec_type = codec_type;
188
    st->need_parsing      = AVSTREAM_PARSE_FULL;
189
    av_set_pts_info(st, 64, 1, 10000000);
190
    return st;
191
}
192

    
193
/**
194
 * parse Media Type structure and create new streams as required
195
 * @param mediatype  Mediatype GUID
196
 * @param subtype    Subtype GUID
197
 * @param formattype Format GUID
198
 * @param size       Size of format buffer
199
 * @return NULL on error
200
 */
201
static AVStream * parse_media_type(AVFormatContext *s, int sid,
202
                                   ff_asf_guid mediatype, ff_asf_guid subtype,
203
                                   ff_asf_guid formattype, int size)
204
{
205
    ByteIOContext *pb = s->pb;
206
    AVStream *st;
207
    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
208
        !ff_guidcmp(formattype, format_cpfilters_processed)) {
209
        ff_asf_guid actual_subtype;
210
        ff_asf_guid actual_formattype;
211

    
212
        if (size < 32) {
213
            av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
214
            url_fskip(pb, size);
215
            return NULL;
216
        }
217

    
218
        url_fskip(pb, size - 32);
219
        ff_get_guid(pb, &actual_subtype);
220
        ff_get_guid(pb, &actual_formattype);
221
        url_fseek(pb, -size, SEEK_CUR);
222

    
223
        st = parse_media_type(s, sid, mediatype, actual_subtype, actual_formattype, size - 32);
224
        url_fskip(pb, 32);
225
        return st;
226
    } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
227
        st = new_stream(s, sid, AVMEDIA_TYPE_AUDIO);
228
        if (!st)
229
            return NULL;
230
        if (!ff_guidcmp(formattype, format_waveformatex)) {
231
            ff_get_wav_header(pb, st->codec, size);
232
        } else {
233
            if (ff_guidcmp(formattype, format_none))
234
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
235
            url_fskip(pb, size);
236
        }
237

    
238
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
239
            st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
240
        } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
241
            if (st->codec->extradata && st->codec->extradata_size >= 22)
242
                parse_mpeg1waveformatex(st);
243
            else
244
                av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
245
        } else {
246
            st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
247
            if (st->codec->codec_id == CODEC_ID_NONE)
248
                av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
249
        }
250
        return st;
251
    } else if (!ff_guidcmp(mediatype, mediatype_video)) {
252
        st = new_stream(s, sid, AVMEDIA_TYPE_VIDEO);
253
        if (!st)
254
            return NULL;
255
        if (!ff_guidcmp(formattype, format_videoinfo2)) {
256
            int consumed = parse_videoinfoheader2(s, st);
257
            url_fskip(pb, FFMAX(size - consumed, 0));
258
        } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
259
            int consumed = parse_videoinfoheader2(s, st);
260
            url_fskip(pb, FFMAX(size - consumed, 0));
261
        } else {
262
            if (ff_guidcmp(formattype, format_none))
263
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
264
            url_fskip(pb, size);
265
        }
266

    
267
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
268
            st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
269
        } else {
270
            st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
271
        }
272
        if (st->codec->codec_id == CODEC_ID_NONE)
273
            av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
274
        return st;
275
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
276
               !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
277
        st = new_stream(s, sid, AVMEDIA_TYPE_SUBTITLE);
278
        if (!st)
279
            return NULL;
280
        if (ff_guidcmp(formattype, format_none))
281
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
282
        url_fskip(pb, size);
283
        st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
284
        return st;
285
    } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
286
               (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
287
        st = new_stream(s, sid, AVMEDIA_TYPE_SUBTITLE);
288
        if (!st)
289
            return NULL;
290
        if (ff_guidcmp(formattype, format_none))
291
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
292
        url_fskip(pb, size);
293
        st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
294
        return st;
295
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
296
               !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
297
        if (ff_guidcmp(formattype, format_none))
298
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
299
        url_fskip(pb, size);
300
        return NULL;
301
    }
302

    
303
    av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
304
                              ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
305
                              ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
306
    url_fskip(pb, size);
307
    return NULL;
308
}
309

    
310
/**
311
 * Read three byte language code
312
 */
313
static void get_language(ByteIOContext *pb, AVStream *st)
314
{
315
    uint8_t language[4];
316
    get_buffer(pb, language, 3);
317
    if (language[0]) {
318
        language[3] = 0;
319
        av_metadata_set2(&st->metadata, "language", language, 0);
320
    }
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_SubtitleSpanningEvent)) {
374
            int stream_index = ff_find_stream_index(s, sid);
375
            if (stream_index >= 0) {
376
                AVStream *st = s->streams[stream_index];
377

    
378
                url_fskip(pb, 10);
379
                get_language(pb, st);
380
                url_fskip(pb, 1);
381

    
382
                st->codec->extradata = av_malloc(4);
383
                if (!st->codec->extradata)
384
                    return AVERROR(ENOMEM);
385
                st->codec->extradata_size = get_buffer(pb, st->codec->extradata, 4);
386
                consumed += 18;
387
            }
388
        } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
389
            int stream_index = ff_find_stream_index(s, sid);
390
            if (stream_index >= 0) {
391
                AVStream *st = s->streams[stream_index];
392
                url_fskip(pb, 12);
393
                get_language(pb, st);
394
                consumed += 15;
395
            }
396
        } else if (!ff_guidcmp(g, timestamp_guid)) {
397
            url_fskip(pb, 8);
398
            wtv->pts = get_le64(pb);
399
            consumed += 16;
400
            if (wtv->pts == -1)
401
                wtv->pts = AV_NOPTS_VALUE;
402
            if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
403
#define WTV_PAD8(x) (((x) + 7) & ~7)
404
                url_fskip(pb, WTV_PAD8(len) - consumed);
405
                return 0;
406
            }
407
        } else if (!ff_guidcmp(g, data_guid)) {
408
            int stream_index = ff_find_stream_index(s, sid);
409
            if (mode == SEEK_TO_DATA && stream_index >= 0) {
410
                if (len_ptr) {
411
                    *len_ptr = len;
412
                }
413
                if (wtv->pts != AV_NOPTS_VALUE)
414
                    av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);
415
                return stream_index;
416
            }
417
        } else if (
418
            !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}) ||
419
            !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}) ||
420
            !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}) ||
421
            !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}) ||
422
            !ff_guidcmp(g, /* EVENTID_AudioDescriptorSpanningEvent */ (const ff_asf_guid){0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E}) ||
423
            !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}) ||
424
            !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}) ||
425
            !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}) ||
426
            !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}) ||
427
            !ff_guidcmp(g, /* EVENTID_CtxADescriptorSpanningEvent */ (const ff_asf_guid){0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24}) ||
428
            !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}) ||
429
            !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}) ||
430
            !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}) ||
431
            !ff_guidcmp(g, /* EVENTID_StreamIDSpanningEvent */ (const ff_asf_guid){0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE}) ||
432
            !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}) ||
433
            !ff_guidcmp(g, /* EVENTID_TeletextSpanningEvent */ (const ff_asf_guid){0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3}) ||
434
            !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
435
            !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
436
            !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
437
            !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
438
            !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
439
            !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
440
            !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
441
            !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
442
            !ff_guidcmp(g, (const ff_asf_guid){0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
443
            //ignore known guids
444
        } else
445
            av_log(s, AV_LOG_WARNING, "unsuported chunk:"PRI_GUID"\n", ARG_GUID(g));
446

    
447
        url_fskip(pb, WTV_PAD8(len) - consumed);
448
    }
449
    return AVERROR_EOF;
450
}
451

    
452
#define WTV_CHUNK_START 0x40000
453

    
454
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
455
{
456
    ByteIOContext *pb = s->pb;
457
    int ret;
458

    
459
    url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
460
    ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
461
    if (ret < 0)
462
        return ret;
463

    
464
    url_fseek(pb, -32, SEEK_CUR);
465
    return 0;
466
}
467

    
468
static int read_packet(AVFormatContext *s, AVPacket *pkt)
469
{
470
    WtvContext *wtv = s->priv_data;
471
    ByteIOContext *pb = s->pb;
472
    int stream_index, len, ret;
473

    
474
    stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
475
    if (stream_index < 0)
476
        return stream_index;
477

    
478
    ret = av_get_packet(pb, pkt, len - 32);
479
    if (ret < 0)
480
        return ret;
481
    pkt->stream_index = stream_index;
482
    pkt->pts          = wtv->pts;
483
    url_fskip(pb, WTV_PAD8(len) - len);
484
    return 0;
485
}
486

    
487
static int read_seek2(AVFormatContext *s, int stream_index,
488
                      int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
489
{
490
    WtvContext *wtv = s->priv_data;
491
    ByteIOContext *pb = s->pb;
492
    AVStream *st;
493
    int i;
494

    
495
    if (stream_index < 0) {
496
        stream_index = av_find_default_stream_index(s);
497
        if (stream_index < 0)
498
            return -1;
499
    }
500
    st = s->streams[stream_index];
501

    
502
    if ((flags & AVSEEK_FLAG_FRAME)) {
503
        return AVERROR_NOTSUPP;
504
    } else if ((flags & AVSEEK_FLAG_BYTE)) {
505
        if (ts < url_ftell(pb)) {
506
            for (i = st->nb_index_entries - 1; i >= 0; i--) {
507
                if (st->index_entries[i].pos <= ts) {
508
                    wtv->pts    = st->index_entries[i].timestamp;
509
                    url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
510
                    break;
511
                }
512
            }
513
            if (i < 0) {
514
                wtv->pts = 0;
515
                url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
516
            }
517
        }
518
        if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)
519
            return AVERROR(ERANGE);
520
        return 0;
521
    } else {
522
        ts *= 10;
523
        i = av_index_search_timestamp(st, ts, flags);
524
        if (i < 0) {
525
            if (st->nb_index_entries > 0) {
526
                wtv->pts    = st->index_entries[st->nb_index_entries - 1].timestamp;
527
                url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);
528
            } else {
529
                wtv->pts = 0;
530
                url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
531
            }
532
            if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
533
                return AVERROR(ERANGE);
534
            return 0;
535
        }
536
        wtv->pts    = st->index_entries[i].timestamp;
537
        url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
538
        return 0;
539
    }
540
}
541

    
542
AVInputFormat wtv_demuxer = {
543
    .name           = "wtv",
544
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
545
    .priv_data_size = sizeof(WtvContext),
546
    .read_probe     = read_probe,
547
    .read_header    = read_header,
548
    .read_packet    = read_packet,
549
    .read_seek2     = read_seek2,
550
    .flags          = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
551
};