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ffmpeg / libavformat / wtv.c @ b070bcfe

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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
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 * Windows Television (WTV) demuxer
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 * @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"
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#include "asf.h"
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#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 {
41
    int seen_data;
42
} WtvStream;
43

    
44
typedef struct WtvContext {
45
    uint64_t pts;
46
} WtvContext;
47

    
48
static int is_zero(uint8_t *v, int n)
49
{
50
   int i;
51
   for (i = 0; i < n; i++)
52
      if (v[i]) return 0;
53
   return 1;
54
}
55

    
56
typedef struct {
57
    enum CodecID id;
58
    ff_asf_guid guid;
59
} AVCodecGuid;
60

    
61
static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
62
{
63
    int i;
64
    for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
65
        if (!ff_guidcmp(guids[i].guid, guid))
66
            return guids[i].id;
67
    }
68
    return CODEC_ID_NONE;
69
}
70

    
71
/* WTV GUIDs */
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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};
74
static const ff_asf_guid meta_guid =
75
    {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
76
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};
78
static const ff_asf_guid data_guid =
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    {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
80
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};
82
static const ff_asf_guid stream2_guid =
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    {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
84
static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
85
    {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
86
static const ff_asf_guid EVENTID_LanguageSpanningEvent =
87
    {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
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static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
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    {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
90
static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
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    {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
92
static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
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    {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
94
static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
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    {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
96
static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
97
    {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
98
static const ff_asf_guid EVENTID_TeletextSpanningEvent =
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    {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
100

    
101
/* Windows media GUIDs */
102

    
103
#define MEDIASUBTYPE_BASE_GUID \
104
    0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
105

    
106
/* Media types */
107
static const ff_asf_guid mediatype_audio =
108
    {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
109
static const ff_asf_guid mediatype_video =
110
    {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
111
static const ff_asf_guid mediasubtype_mpeg1payload =
112
    {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
113
static const ff_asf_guid mediatype_mpeg2_sections =
114
    {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
115
static const ff_asf_guid mediatype_mpeg2_pes =
116
    {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
117
static const ff_asf_guid mediatype_mstvcaption =
118
    {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
119

    
120
/* Media subtypes */
121
static const ff_asf_guid mediasubtype_cpfilters_processed =
122
    {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
123
static const ff_asf_guid mediasubtype_dvb_subtitle =
124
    {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
125
static const ff_asf_guid mediasubtype_teletext =
126
    {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
127
static const ff_asf_guid mediasubtype_dtvccdata =
128
    {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
129
static const ff_asf_guid mediasubtype_mpeg2_sections =
130
    {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
131

    
132
/* Formats */
133
static const ff_asf_guid format_cpfilters_processed =
134
    {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
135
static const ff_asf_guid format_waveformatex =
136
    {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
137
static const ff_asf_guid format_videoinfo2 =
138
    {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
139
static const ff_asf_guid format_mpeg2_video =
140
    {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
141
static const ff_asf_guid format_none =
142
    {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
143

    
144
static const AVCodecGuid video_guids[] = {
145
    {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
146
    {CODEC_ID_NONE}
147
};
148

    
149
static const AVCodecGuid audio_guids[] = {
150
    {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
151
    {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
152
    {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
153
    {CODEC_ID_NONE}
154
};
155

    
156
static int read_probe(AVProbeData *p)
157
{
158
    return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
159
}
160

    
161
/**
162
 * parse VIDEOINFOHEADER2 structure
163
 * @return bytes consumed
164
 */
165
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
166
{
167
    ByteIOContext *pb = s->pb;
168

    
169
    url_fskip(pb, 72);  // picture aspect ratio is unreliable
170
    ff_get_bmp_header(pb, st);
171

    
172
    return 72 + 40;
173
}
174

    
175
/**
176
 * Parse MPEG1WAVEFORMATEX extradata structure
177
 */
178
static void parse_mpeg1waveformatex(AVStream *st)
179
{
180
    /* fwHeadLayer */
181
    switch (AV_RL16(st->codec->extradata)) {
182
    case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
183
    case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
184
    case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
185
    }
186

    
187
    st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
188

    
189
    /* dwHeadMode */
190
    switch (AV_RL16(st->codec->extradata + 6)) {
191
    case 1 : case 2 : case 4 : st->codec->channels = 2; break;
192
    case 8 :                   st->codec->channels = 1; break;
193
    }
194
}
195

    
196
/**
197
 * Initialise stream
198
 * @param st Stream to initialise, or NULL to create and initialise new stream
199
 * @return NULL on error
200
 */
201
static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
202
{
203
    if (st) {
204
        if (st->codec->extradata) {
205
            av_freep(&st->codec->extradata);
206
            st->codec->extradata_size = 0;
207
        }
208
    } else {
209
        WtvStream *wst = av_mallocz(sizeof(WtvStream));
210
        if (!wst)
211
            return NULL;
212
        st = av_new_stream(s, sid);
213
        if (!st)
214
            return NULL;
215
        st->priv_data = wst;
216
    }
217
    st->codec->codec_type = codec_type;
218
    st->need_parsing      = AVSTREAM_PARSE_FULL;
219
    av_set_pts_info(st, 64, 1, 10000000);
220
    return st;
221
}
222

    
223
/**
224
 * parse Media Type structure and populate stream
225
 * @param st         Stream, or NULL to create new stream
226
 * @param mediatype  Mediatype GUID
227
 * @param subtype    Subtype GUID
228
 * @param formattype Format GUID
229
 * @param size       Size of format buffer
230
 * @return NULL on error
231
 */
232
static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
233
                                   ff_asf_guid mediatype, ff_asf_guid subtype,
234
                                   ff_asf_guid formattype, int size)
235
{
236
    ByteIOContext *pb = s->pb;
237
    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
238
        !ff_guidcmp(formattype, format_cpfilters_processed)) {
239
        ff_asf_guid actual_subtype;
240
        ff_asf_guid actual_formattype;
241

    
242
        if (size < 32) {
243
            av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
244
            url_fskip(pb, size);
245
            return NULL;
246
        }
247

    
248
        url_fskip(pb, size - 32);
249
        ff_get_guid(pb, &actual_subtype);
250
        ff_get_guid(pb, &actual_formattype);
251
        url_fseek(pb, -size, SEEK_CUR);
252

    
253
        st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
254
        url_fskip(pb, 32);
255
        return st;
256
    } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
257
        st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
258
        if (!st)
259
            return NULL;
260
        if (!ff_guidcmp(formattype, format_waveformatex)) {
261
            ff_get_wav_header(pb, st->codec, size);
262
        } else {
263
            if (ff_guidcmp(formattype, format_none))
264
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
265
            url_fskip(pb, size);
266
        }
267

    
268
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
269
            st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
270
        } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
271
            if (st->codec->extradata && st->codec->extradata_size >= 22)
272
                parse_mpeg1waveformatex(st);
273
            else
274
                av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
275
        } else {
276
            st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
277
            if (st->codec->codec_id == CODEC_ID_NONE)
278
                av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
279
        }
280
        return st;
281
    } else if (!ff_guidcmp(mediatype, mediatype_video)) {
282
        st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
283
        if (!st)
284
            return NULL;
285
        if (!ff_guidcmp(formattype, format_videoinfo2)) {
286
            int consumed = parse_videoinfoheader2(s, st);
287
            url_fskip(pb, FFMAX(size - consumed, 0));
288
        } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
289
            int consumed = parse_videoinfoheader2(s, st);
290
            url_fskip(pb, FFMAX(size - consumed, 0));
291
        } else {
292
            if (ff_guidcmp(formattype, format_none))
293
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
294
            url_fskip(pb, size);
295
        }
296

    
297
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
298
            st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
299
        } else {
300
            st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
301
        }
302
        if (st->codec->codec_id == CODEC_ID_NONE)
303
            av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
304
        return st;
305
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
306
               !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
307
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
308
        if (!st)
309
            return NULL;
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
        st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
314
        return st;
315
    } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
316
               (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
317
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
318
        if (!st)
319
            return NULL;
320
        if (ff_guidcmp(formattype, format_none))
321
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
322
        url_fskip(pb, size);
323
        st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
324
        return st;
325
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
326
               !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
327
        if (ff_guidcmp(formattype, format_none))
328
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
329
        url_fskip(pb, size);
330
        return NULL;
331
    }
332

    
333
    av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
334
                              ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
335
                              ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
336
    url_fskip(pb, size);
337
    return NULL;
338
}
339

    
340
enum {
341
    SEEK_TO_DATA = 0,
342
    SEEK_TO_BYTE,
343
    SEEK_TO_PTS,
344
};
345

    
346
/**
347
 * Parse WTV chunks
348
 * @param mode SEEK_TO_DATA, SEEK_TO_BYTE, SEEK_TO_PTS
349
 * @param seekts either byte position or timestamp
350
 * @param[out] len Length of data chunk
351
 * @return stream index of data chunk, or <0 on error
352
 */
353
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
354
{
355
    WtvContext *wtv = s->priv_data;
356
    ByteIOContext *pb = s->pb;
357
    while (!url_feof(pb)) {
358
        ff_asf_guid g;
359
        int len, sid, consumed;
360

    
361
        if (mode == SEEK_TO_BYTE && url_ftell(pb) >= seekts)
362
            return 0;
363

    
364
        ff_get_guid(pb, &g);
365
        if (is_zero(g, sizeof(ff_asf_guid)))
366
            return AVERROR_EOF;
367

    
368
        len = get_le32(pb);
369
        if (len < 32)
370
            break;
371
        sid = get_le32(pb) & 0x7FFF;
372
        url_fskip(pb, 8);
373
        consumed = 32;
374

    
375
        if (!ff_guidcmp(g, stream_guid)) {
376
            if (ff_find_stream_index(s, sid) < 0) {
377
                ff_asf_guid mediatype, subtype, formattype;
378
                int size;
379
                consumed += 20;
380
                url_fskip(pb, 16);
381
                if (get_le32(pb)) {
382
                    url_fskip(pb, 8);
383
                    ff_get_guid(pb, &mediatype);
384
                    ff_get_guid(pb, &subtype);
385
                    url_fskip(pb, 12);
386
                    ff_get_guid(pb, &formattype);
387
                    size = get_le32(pb);
388
                    parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
389
                    consumed += 72 + size;
390
                }
391
            }
392
        } else if (!ff_guidcmp(g, stream2_guid)) {
393
            int stream_index = ff_find_stream_index(s, sid);
394
            if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
395
                ff_asf_guid mediatype, subtype, formattype;
396
                int size;
397
                url_fskip(pb, 12);
398
                ff_get_guid(pb, &mediatype);
399
                ff_get_guid(pb, &subtype);
400
                url_fskip(pb, 12);
401
                ff_get_guid(pb, &formattype);
402
                size = get_le32(pb);
403
                parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
404
                consumed += 76 + size;
405
            }
406
        } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
407
                   !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
408
                   !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
409
                   !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
410
                   !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
411
                   !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
412
            int stream_index = ff_find_stream_index(s, sid);
413
            if (stream_index >= 0) {
414
                AVStream *st = s->streams[stream_index];
415
                uint8_t buf[258];
416
                const uint8_t *pbuf = buf;
417
                int buf_size;
418

    
419
                url_fskip(pb, 8);
420
                consumed += 8;
421
                if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
422
                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
423
                    url_fskip(pb, 6);
424
                    consumed += 6;
425
                }
426

    
427
                buf_size = FFMIN(len - consumed, sizeof(buf));
428
                get_buffer(pb, buf, buf_size);
429
                consumed += buf_size;
430
                ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
431
            }
432
        } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
433
            int stream_index = ff_find_stream_index(s, sid);
434
            if (stream_index >= 0) {
435
                url_fskip(pb, 12);
436
                if (get_le32(pb))
437
                    av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
438
                consumed += 16;
439
            }
440
        } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
441
            int stream_index = ff_find_stream_index(s, sid);
442
            if (stream_index >= 0) {
443
                AVStream *st = s->streams[stream_index];
444
                uint8_t language[4];
445
                url_fskip(pb, 12);
446
                get_buffer(pb, language, 3);
447
                if (language[0]) {
448
                    language[3] = 0;
449
                    av_metadata_set2(&st->metadata, "language", language, 0);
450
                }
451
                consumed += 15;
452
            }
453
        } else if (!ff_guidcmp(g, timestamp_guid)) {
454
            int stream_index = ff_find_stream_index(s, sid);
455
            if (stream_index >= 0) {
456
                url_fskip(pb, 8);
457
                wtv->pts = get_le64(pb);
458
                consumed += 16;
459
                if (wtv->pts == -1)
460
                    wtv->pts = AV_NOPTS_VALUE;
461
                if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
462
#define WTV_PAD8(x) (((x) + 7) & ~7)
463
                    url_fskip(pb, WTV_PAD8(len) - consumed);
464
                    return 0;
465
                }
466
            }
467
        } else if (!ff_guidcmp(g, data_guid)) {
468
            int stream_index = ff_find_stream_index(s, sid);
469
            if (mode == SEEK_TO_DATA && stream_index >= 0) {
470
                WtvStream *wst = s->streams[stream_index]->priv_data;
471
                wst->seen_data = 1;
472
                if (len_ptr) {
473
                    *len_ptr = len;
474
                }
475
                if (wtv->pts != AV_NOPTS_VALUE)
476
                    av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);
477
                return stream_index;
478
            }
479
        } else if (
480
            !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}) ||
481
            !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}) ||
482
            !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}) ||
483
            !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}) ||
484
            !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}) ||
485
            !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}) ||
486
            !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}) ||
487
            !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}) ||
488
            !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}) ||
489
            !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}) ||
490
            !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}) ||
491
            !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
492
            !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
493
            !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
494
            !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
495
            !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
496
            !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
497
            !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
498
            !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
499
            //ignore known guids
500
        } else
501
            av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
502

    
503
        url_fskip(pb, WTV_PAD8(len) - consumed);
504
    }
505
    return AVERROR_EOF;
506
}
507

    
508
#define WTV_CHUNK_START 0x40000
509

    
510
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
511
{
512
    ByteIOContext *pb = s->pb;
513
    int ret;
514

    
515
    url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
516
    ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
517
    if (ret < 0)
518
        return ret;
519

    
520
    url_fseek(pb, -32, SEEK_CUR);
521
    return 0;
522
}
523

    
524
static int read_packet(AVFormatContext *s, AVPacket *pkt)
525
{
526
    WtvContext *wtv = s->priv_data;
527
    ByteIOContext *pb = s->pb;
528
    int stream_index, len, ret;
529

    
530
    stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
531
    if (stream_index < 0)
532
        return stream_index;
533

    
534
    ret = av_get_packet(pb, pkt, len - 32);
535
    if (ret < 0)
536
        return ret;
537
    pkt->stream_index = stream_index;
538
    pkt->pts          = wtv->pts;
539
    url_fskip(pb, WTV_PAD8(len) - len);
540
    return 0;
541
}
542

    
543
static int read_seek2(AVFormatContext *s, int stream_index,
544
                      int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
545
{
546
    WtvContext *wtv = s->priv_data;
547
    ByteIOContext *pb = s->pb;
548
    AVStream *st;
549
    int i;
550

    
551
    if (stream_index < 0) {
552
        stream_index = av_find_default_stream_index(s);
553
        if (stream_index < 0)
554
            return -1;
555
    }
556
    st = s->streams[stream_index];
557

    
558
    if ((flags & AVSEEK_FLAG_FRAME)) {
559
        return AVERROR_NOTSUPP;
560
    } else if ((flags & AVSEEK_FLAG_BYTE)) {
561
        if (ts < url_ftell(pb)) {
562
            for (i = st->nb_index_entries - 1; i >= 0; i--) {
563
                if (st->index_entries[i].pos <= ts) {
564
                    wtv->pts    = st->index_entries[i].timestamp;
565
                    url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
566
                    break;
567
                }
568
            }
569
            if (i < 0) {
570
                wtv->pts = 0;
571
                url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
572
            }
573
        }
574
        if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)
575
            return AVERROR(ERANGE);
576
        return 0;
577
    } else {
578
        ts *= 10;
579
        i = av_index_search_timestamp(st, ts, flags);
580
        if (i < 0) {
581
            if (st->nb_index_entries > 0) {
582
                wtv->pts    = st->index_entries[st->nb_index_entries - 1].timestamp;
583
                url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);
584
            } else {
585
                wtv->pts = 0;
586
                url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
587
            }
588
            if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
589
                return AVERROR(ERANGE);
590
            return 0;
591
        }
592
        wtv->pts    = st->index_entries[i].timestamp;
593
        url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
594
        return 0;
595
    }
596
}
597

    
598
AVInputFormat wtv_demuxer = {
599
    .name           = "wtv",
600
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
601
    .priv_data_size = sizeof(WtvContext),
602
    .read_probe     = read_probe,
603
    .read_header    = read_header,
604
    .read_packet    = read_packet,
605
    .read_seek2     = read_seek2,
606
    .flags          = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
607
};