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ffmpeg / libavformat / wtv.c @ 2d9fd181

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1
/*
2
 * Windows Television (WTV) demuxer
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 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * 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

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

    
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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat_readwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "riff.h"
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#include "asf.h"
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#include "mpegts.h"
35

    
36
/* Macros for formating GUIDs */
37
#define PRI_GUID \
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    "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
39
#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]
41

    
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#define PRI_PRETTY_GUID \
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    "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
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#define ARG_PRETTY_GUID(g) \
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    AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
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#define LEN_PRETTY_GUID 34
47

    
48
/*
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 *
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 * File system routines
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 *
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 */
53

    
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#define WTV_SECTOR_BITS    12
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#define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
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#define WTV_BIGSECTOR_BITS 18
57

    
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typedef struct {
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    ByteIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
60

    
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    int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
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    uint32_t *sectors;   /** file allocation table */
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    int nb_sectors;      /** number of sectors */
64

    
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    int error;
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    int64_t position;
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    int64_t length;
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} WtvFile;
69

    
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/**
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 * @return bytes read, 0 on end of file, or <0 on error
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 */
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static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
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{
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    WtvFile *wf = opaque;
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    ByteIOContext *pb = wf->pb_filesystem;
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    int nread = 0;
78

    
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    if (wf->error || url_ferror(pb))
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        return -1;
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    if (wf->position >= wf->length || url_feof(pb))
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        return 0;
83

    
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    buf_size = FFMIN(buf_size, wf->length - wf->position);
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    while(nread < buf_size) {
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        int n;
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        int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
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        int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
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        n = get_buffer(pb, buf, read_request);
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        if (n <= 0)
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            break;
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        nread += n;
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        buf += n;
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        wf->position += n;
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        if (n == remaining_in_sector) {
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            int i = wf->position >> wf->sector_bits;
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            if (i >= wf->nb_sectors ||
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                (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
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                url_fseek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
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                wf->error = 1;
102
                break;
103
            }
104
        }
105
    }
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    return nread;
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}
108

    
109
/**
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 * @return position (or file length)
111
 */
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static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
113
{
114
    WtvFile *wf = opaque;
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    ByteIOContext *pb = wf->pb_filesystem;
116

    
117
    if (whence == AVSEEK_SIZE)
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        return wf->length;
119
    else if (whence == SEEK_CUR)
120
        offset = wf->position + offset;
121
    else if (whence == SEEK_END)
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        offset = wf->length;
123

    
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    wf->error = offset < 0 || offset >= wf->length ||
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                url_fseek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
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                              + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
127
    wf->position = offset;
128
    return offset;
129
}
130

    
131
/**
132
 * read non-zero integers (le32) from input stream
133
 * @param pb
134
 * @param[out] data destination
135
 * @param     count maximum number of integers to read
136
 * @return    total number of integers read
137
 */
138
static int read_ints(ByteIOContext *pb, uint32_t *data, int count)
139
{
140
    int i, total = 0;
141
    for (i = 0; i < count; i++) {
142
        if ((data[total] = get_le32(pb)))
143
           total++;
144
    }
145
    return total;
146
}
147

    
148
/**
149
 * Open file
150
 * @param first_sector  First sector
151
 * @param length        Length of file (bytes)
152
 * @param depth         File allocation table depth
153
 * @return NULL on error
154
 */
155
static ByteIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
156
{
157
    ByteIOContext *pb;
158
    WtvFile *wf;
159
    uint8_t *buffer;
160

    
161
    if (url_fseek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
162
        return NULL;
163

    
164
    wf = av_mallocz(sizeof(WtvFile));
165
    if (!wf)
166
        return NULL;
167

    
168
    if (depth == 0) {
169
        wf->sectors = av_malloc(sizeof(uint32_t));
170
        if (!wf->sectors) {
171
            av_free(wf);
172
            return NULL;
173
        }
174
        wf->sectors[0]  = first_sector;
175
        wf->nb_sectors  = 1;
176
        wf->sector_bits = WTV_SECTOR_BITS;
177
    } else if (depth == 1) {
178
        wf->sectors = av_malloc(WTV_SECTOR_SIZE);
179
        if (!wf->sectors) {
180
            av_free(wf);
181
            return NULL;
182
        }
183
        wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
184
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
185
    } else if (depth == 2) {
186
        uint32_t sectors1[WTV_SECTOR_SIZE / 4];
187
        int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
188
        int i;
189

    
190
        wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
191
        if (!wf->sectors) {
192
            av_free(wf);
193
            return NULL;
194
        }
195
        wf->nb_sectors = 0;
196
        for (i = 0; i < nb_sectors1; i++) {
197
            if (url_fseek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
198
                break;
199
            wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
200
        }
201
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
202
    } else {
203
        av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
204
        av_free(wf);
205
        return NULL;
206
    }
207

    
208
    if (!wf->nb_sectors) {
209
        av_free(wf->sectors);
210
        av_free(wf);
211
        return NULL;
212
    }
213

    
214
    /* check length */
215
    length &= 0xFFFFFFFFFFFF;
216
    if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
217
        av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
218
        length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
219
    }
220
    wf->length = length;
221

    
222
    /* seek to intial sector */
223
    wf->position = 0;
224
    if (url_fseek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
225
        av_free(wf->sectors);
226
        av_free(wf);
227
        return NULL;
228
    }
229

    
230
    wf->pb_filesystem = s->pb;
231
    buffer = av_malloc(1 << wf->sector_bits);
232
    if (!buffer) {
233
        av_free(wf->sectors);
234
        av_free(wf);
235
        return NULL;
236
    }
237

    
238
    pb = av_alloc_put_byte(buffer, 1 << wf->sector_bits, 0, wf,
239
                           wtvfile_read_packet, NULL, wtvfile_seek);
240
    if (!pb) {
241
        av_free(buffer);
242
        av_free(wf->sectors);
243
        av_free(wf);
244
    }
245
    return pb;
246
}
247

    
248
static const ff_asf_guid dir_entry_guid =
249
    {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
250

    
251
/**
252
 * Open file using filename
253
 * @param[in]  buf       directory buffer
254
 * @param      buf_size  directory buffer size
255
 * @param[in]  filename
256
 * @param      filename_size size of filename
257
 * @return NULL on error
258
 */
259
static ByteIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
260
{
261
    const uint8_t *buf_end = buf + buf_size;
262

    
263
    while(buf + 48 <= buf_end) {
264
        int dir_length, name_size, first_sector, depth;
265
        uint64_t file_length;
266
        const uint8_t *name;
267
        if (ff_guidcmp(buf, dir_entry_guid)) {
268
            av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
269
                   "remaining directory entries ignored\n", ARG_GUID(buf));
270
            break;
271
        }
272
        dir_length  = AV_RL16(buf + 16);
273
        file_length = AV_RL64(buf + 24);
274
        name_size   = 2 * AV_RL32(buf + 32);
275
        if (buf + 48 + name_size > buf_end) {
276
            av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
277
            break;
278
        }
279
        first_sector = AV_RL32(buf + 40 + name_size);
280
        depth        = AV_RL32(buf + 44 + name_size);
281

    
282
        /* compare file name; test optional null terminator */
283
        name = buf + 40;
284
        if (name_size >= filename_size &&
285
            !memcmp(name, filename, filename_size) &&
286
            (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
287
            return wtvfile_open_sector(first_sector, file_length, depth, s);
288

    
289
        buf += dir_length;
290
    }
291
    return 0;
292
}
293

    
294
#define wtvfile_open(s, buf, buf_size, filename) \
295
    wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
296

    
297
/**
298
 * Close file opened with wtvfile_open_sector(), or wtv_open()
299
 */
300
static void wtvfile_close(ByteIOContext *pb)
301
{
302
    WtvFile *wf = pb->opaque;
303
    av_free(wf->sectors);
304
    av_free(pb);
305
}
306

    
307
/*
308
 *
309
 * Main demuxer
310
 *
311
 */
312

    
313
typedef struct {
314
    int seen_data;
315
} WtvStream;
316

    
317
typedef struct {
318
    ByteIOContext *pb;       /** timeline file */
319
    int64_t epoch;
320
    int64_t pts;             /** pts for next data chunk */
321
    int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
322

    
323
    /* maintain private seek index, as the AVIndexEntry->pos is relative to the
324
       start of the 'timeline' file, not the file system (AVFormatContext->pb) */
325
    AVIndexEntry *index_entries;
326
    int nb_index_entries;
327
    unsigned int index_entries_allocated_size;
328
} WtvContext;
329

    
330
typedef struct {
331
    enum CodecID id;
332
    ff_asf_guid guid;
333
} AVCodecGuid;
334

    
335
static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
336
{
337
    int i;
338
    for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
339
        if (!ff_guidcmp(guids[i].guid, guid))
340
            return guids[i].id;
341
    }
342
    return CODEC_ID_NONE;
343
}
344

    
345
/* WTV GUIDs */
346
static const ff_asf_guid wtv_guid =
347
    {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
348
static const ff_asf_guid metadata_guid =
349
    {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
350
static const ff_asf_guid timestamp_guid =
351
    {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
352
static const ff_asf_guid data_guid =
353
    {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
354
static const ff_asf_guid stream_guid =
355
    {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
356
static const ff_asf_guid stream2_guid =
357
    {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
358
static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
359
    {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
360
static const ff_asf_guid EVENTID_LanguageSpanningEvent =
361
    {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
362
static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
363
    {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
364
static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
365
    {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
366
static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
367
    {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
368
static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
369
    {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
370
static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
371
    {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
372
static const ff_asf_guid EVENTID_TeletextSpanningEvent =
373
    {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
374

    
375
/* Windows media GUIDs */
376

    
377
#define MEDIASUBTYPE_BASE_GUID \
378
    0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
379

    
380
/* Media types */
381
static const ff_asf_guid mediatype_audio =
382
    {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
383
static const ff_asf_guid mediatype_video =
384
    {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
385
static const ff_asf_guid mediasubtype_mpeg1payload =
386
    {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
387
static const ff_asf_guid mediatype_mpeg2_sections =
388
    {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
389
static const ff_asf_guid mediatype_mpeg2_pes =
390
    {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
391
static const ff_asf_guid mediatype_mstvcaption =
392
    {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
393

    
394
/* Media subtypes */
395
static const ff_asf_guid mediasubtype_cpfilters_processed =
396
    {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
397
static const ff_asf_guid mediasubtype_dvb_subtitle =
398
    {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
399
static const ff_asf_guid mediasubtype_teletext =
400
    {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
401
static const ff_asf_guid mediasubtype_dtvccdata =
402
    {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
403
static const ff_asf_guid mediasubtype_mpeg2_sections =
404
    {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
405

    
406
/* Formats */
407
static const ff_asf_guid format_cpfilters_processed =
408
    {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
409
static const ff_asf_guid format_waveformatex =
410
    {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
411
static const ff_asf_guid format_videoinfo2 =
412
    {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
413
static const ff_asf_guid format_mpeg2_video =
414
    {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
415
static const ff_asf_guid format_none =
416
    {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
417

    
418
static const AVCodecGuid video_guids[] = {
419
    {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
420
    {CODEC_ID_NONE}
421
};
422

    
423
static const AVCodecGuid audio_guids[] = {
424
    {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
425
    {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
426
    {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
427
    {CODEC_ID_NONE}
428
};
429

    
430
static int read_probe(AVProbeData *p)
431
{
432
    return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
433
}
434

    
435
/**
436
 * Convert win32 FILETIME to ISO-8601 string
437
 */
438
static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
439
{
440
    time_t t = (value / 10000000LL) - 11644473600LL;
441
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
442
}
443

    
444
/**
445
 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
446
 */
447
static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
448
{
449
    time_t t = (value / 10000000LL) - 719162LL*86400LL;
450
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
451
}
452

    
453
/**
454
 * Convert OLE DATE to ISO-8601 string
455
 */
456
static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
457
{
458
    time_t t = 631112400LL + 86400*av_int2dbl(value);
459
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
460
}
461

    
462
static void get_attachment(AVFormatContext *s, ByteIOContext *pb, int length)
463
{
464
    char mime[1024];
465
    char description[1024];
466
    unsigned int filesize;
467
    AVStream *st;
468
    int64_t pos = url_ftell(pb);
469

    
470
    avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
471
    if (strcmp(mime, "image/jpeg"))
472
        goto done;
473

    
474
    get_byte(pb);
475
    avio_get_str16le(pb, INT_MAX, description, sizeof(description));
476
    filesize = get_le32(pb);
477
    if (!filesize)
478
        goto done;
479

    
480
    st = av_new_stream(s, 0);
481
    if (!st)
482
        goto done;
483
    av_metadata_set2(&st->metadata, "title", description, 0);
484
    st->codec->codec_id   = CODEC_ID_MJPEG;
485
    st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
486
    st->codec->extradata  = av_mallocz(filesize);
487
    if (!st->codec->extradata)
488
        goto done;
489
    st->codec->extradata_size = filesize;
490
    get_buffer(pb, st->codec->extradata, filesize);
491
done:
492
    url_fseek(pb, pos + length, SEEK_SET);
493
}
494

    
495
static void get_tag(AVFormatContext *s, ByteIOContext *pb, const char *key, int type, int length)
496
{
497
    int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
498
    char *buf = av_malloc(buf_size);
499
    if (!buf)
500
        return;
501

    
502
    if (type == 0 && length == 4) {
503
        snprintf(buf, buf_size, "%"PRIi32, get_le32(pb));
504
    } else if (type == 1) {
505
        avio_get_str16le(pb, length, buf, buf_size);
506
        if (!strlen(buf)) {
507
           av_free(buf);
508
           return;
509
        }
510
    } else if (type == 3 && length == 4) {
511
        strcpy(buf, get_le32(pb) ? "true" : "false");
512
    } else if (type == 4 && length == 8) {
513
        int64_t num = get_le64(pb);
514
        if (!strcmp(key, "WM/EncodingTime") ||
515
            !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
516
            filetime_to_iso8601(buf, buf_size, num);
517
        else if (!strcmp(key, "WM/WMRVEncodeTime") ||
518
                 !strcmp(key, "WM/WMRVEndTime"))
519
            crazytime_to_iso8601(buf, buf_size, num);
520
        else if (!strcmp(key, "WM/WMRVExpirationDate"))
521
            oledate_to_iso8601(buf, buf_size, num);
522
        else if (!strcmp(key, "WM/WMRVBitrate"))
523
            snprintf(buf, buf_size, "%f", av_int2dbl(num));
524
        else
525
            snprintf(buf, buf_size, "%"PRIi64, num);
526
    } else if (type == 5 && length == 2) {
527
        snprintf(buf, buf_size, "%"PRIi16, get_le16(pb));
528
    } else if (type == 6 && length == 16) {
529
        ff_asf_guid guid;
530
        get_buffer(pb, guid, 16);
531
        snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
532
    } else if (type == 2 && !strcmp(key, "WM/Picture")) {
533
        get_attachment(s, pb, length);
534
        av_freep(&buf);
535
        return;
536
    } else {
537
        av_freep(&buf);
538
        av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
539
        url_fskip(pb, length);
540
        return;
541
    }
542

    
543
    av_metadata_set2(&s->metadata, key, buf, 0);
544
    av_freep(&buf);
545
}
546

    
547
/**
548
 * Parse metadata entries
549
 */
550
static void parse_legacy_attrib(AVFormatContext *s, ByteIOContext *pb)
551
{
552
    ff_asf_guid guid;
553
    int length, type;
554
    while(!url_feof(pb)) {
555
        char key[1024];
556
        ff_get_guid(pb, &guid);
557
        type   = get_le32(pb);
558
        length = get_le32(pb);
559
        if (!length)
560
            break;
561
        if (ff_guidcmp(&guid, metadata_guid)) {
562
            av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
563
                   "remaining metadata entries ignored\n", ARG_GUID(guid));
564
            break;
565
        }
566
        avio_get_str16le(pb, INT_MAX, key, sizeof(key));
567
        get_tag(s, pb, key, type, length);
568
    }
569

    
570
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
571
}
572

    
573
/**
574
 * parse VIDEOINFOHEADER2 structure
575
 * @return bytes consumed
576
 */
577
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
578
{
579
    WtvContext *wtv = s->priv_data;
580
    ByteIOContext *pb = wtv->pb;
581

    
582
    url_fskip(pb, 72);  // picture aspect ratio is unreliable
583
    ff_get_bmp_header(pb, st);
584

    
585
    return 72 + 40;
586
}
587

    
588
/**
589
 * Parse MPEG1WAVEFORMATEX extradata structure
590
 */
591
static void parse_mpeg1waveformatex(AVStream *st)
592
{
593
    /* fwHeadLayer */
594
    switch (AV_RL16(st->codec->extradata)) {
595
    case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
596
    case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
597
    case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
598
    }
599

    
600
    st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
601

    
602
    /* dwHeadMode */
603
    switch (AV_RL16(st->codec->extradata + 6)) {
604
    case 1 : case 2 : case 4 : st->codec->channels = 2; break;
605
    case 8 :                   st->codec->channels = 1; break;
606
    }
607
}
608

    
609
/**
610
 * Initialise stream
611
 * @param st Stream to initialise, or NULL to create and initialise new stream
612
 * @return NULL on error
613
 */
614
static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
615
{
616
    if (st) {
617
        if (st->codec->extradata) {
618
            av_freep(&st->codec->extradata);
619
            st->codec->extradata_size = 0;
620
        }
621
    } else {
622
        WtvStream *wst = av_mallocz(sizeof(WtvStream));
623
        if (!wst)
624
            return NULL;
625
        st = av_new_stream(s, sid);
626
        if (!st)
627
            return NULL;
628
        st->priv_data = wst;
629
    }
630
    st->codec->codec_type = codec_type;
631
    st->need_parsing      = AVSTREAM_PARSE_FULL;
632
    av_set_pts_info(st, 64, 1, 10000000);
633
    return st;
634
}
635

    
636
/**
637
 * parse Media Type structure and populate stream
638
 * @param st         Stream, or NULL to create new stream
639
 * @param mediatype  Mediatype GUID
640
 * @param subtype    Subtype GUID
641
 * @param formattype Format GUID
642
 * @param size       Size of format buffer
643
 * @return NULL on error
644
 */
645
static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
646
                                   ff_asf_guid mediatype, ff_asf_guid subtype,
647
                                   ff_asf_guid formattype, int size)
648
{
649
    WtvContext *wtv = s->priv_data;
650
    ByteIOContext *pb = wtv->pb;
651
    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
652
        !ff_guidcmp(formattype, format_cpfilters_processed)) {
653
        ff_asf_guid actual_subtype;
654
        ff_asf_guid actual_formattype;
655

    
656
        if (size < 32) {
657
            av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
658
            url_fskip(pb, size);
659
            return NULL;
660
        }
661

    
662
        url_fskip(pb, size - 32);
663
        ff_get_guid(pb, &actual_subtype);
664
        ff_get_guid(pb, &actual_formattype);
665
        url_fseek(pb, -size, SEEK_CUR);
666

    
667
        st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
668
        url_fskip(pb, 32);
669
        return st;
670
    } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
671
        st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
672
        if (!st)
673
            return NULL;
674
        if (!ff_guidcmp(formattype, format_waveformatex)) {
675
            ff_get_wav_header(pb, st->codec, size);
676
        } else {
677
            if (ff_guidcmp(formattype, format_none))
678
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
679
            url_fskip(pb, size);
680
        }
681

    
682
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
683
            st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
684
        } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
685
            if (st->codec->extradata && st->codec->extradata_size >= 22)
686
                parse_mpeg1waveformatex(st);
687
            else
688
                av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
689
        } else {
690
            st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
691
            if (st->codec->codec_id == CODEC_ID_NONE)
692
                av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
693
        }
694
        return st;
695
    } else if (!ff_guidcmp(mediatype, mediatype_video)) {
696
        st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
697
        if (!st)
698
            return NULL;
699
        if (!ff_guidcmp(formattype, format_videoinfo2)) {
700
            int consumed = parse_videoinfoheader2(s, st);
701
            url_fskip(pb, FFMAX(size - consumed, 0));
702
        } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
703
            int consumed = parse_videoinfoheader2(s, st);
704
            url_fskip(pb, FFMAX(size - consumed, 0));
705
        } else {
706
            if (ff_guidcmp(formattype, format_none))
707
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
708
            url_fskip(pb, size);
709
        }
710

    
711
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
712
            st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
713
        } else {
714
            st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
715
        }
716
        if (st->codec->codec_id == CODEC_ID_NONE)
717
            av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
718
        return st;
719
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
720
               !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
721
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
722
        if (!st)
723
            return NULL;
724
        if (ff_guidcmp(formattype, format_none))
725
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
726
        url_fskip(pb, size);
727
        st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
728
        return st;
729
    } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
730
               (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
731
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
732
        if (!st)
733
            return NULL;
734
        if (ff_guidcmp(formattype, format_none))
735
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
736
        url_fskip(pb, size);
737
        st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
738
        return st;
739
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
740
               !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
741
        if (ff_guidcmp(formattype, format_none))
742
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
743
        url_fskip(pb, size);
744
        return NULL;
745
    }
746

    
747
    av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
748
                              ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
749
                              ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
750
    url_fskip(pb, size);
751
    return NULL;
752
}
753

    
754
enum {
755
    SEEK_TO_DATA = 0,
756
    SEEK_TO_PTS,
757
};
758

    
759
/**
760
 * Parse WTV chunks
761
 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
762
 * @param seekts timestamp
763
 * @param[out] len Length of data chunk
764
 * @return stream index of data chunk, or <0 on error
765
 */
766
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
767
{
768
    WtvContext *wtv = s->priv_data;
769
    ByteIOContext *pb = wtv->pb;
770
    while (!url_feof(pb)) {
771
        ff_asf_guid g;
772
        int len, sid, consumed;
773

    
774
        ff_get_guid(pb, &g);
775
        len = get_le32(pb);
776
        if (len < 32)
777
            break;
778
        sid = get_le32(pb) & 0x7FFF;
779
        url_fskip(pb, 8);
780
        consumed = 32;
781

    
782
        if (!ff_guidcmp(g, stream_guid)) {
783
            if (ff_find_stream_index(s, sid) < 0) {
784
                ff_asf_guid mediatype, subtype, formattype;
785
                int size;
786
                consumed += 20;
787
                url_fskip(pb, 16);
788
                if (get_le32(pb)) {
789
                    url_fskip(pb, 8);
790
                    ff_get_guid(pb, &mediatype);
791
                    ff_get_guid(pb, &subtype);
792
                    url_fskip(pb, 12);
793
                    ff_get_guid(pb, &formattype);
794
                    size = get_le32(pb);
795
                    parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
796
                    consumed += 72 + size;
797
                }
798
            }
799
        } else if (!ff_guidcmp(g, stream2_guid)) {
800
            int stream_index = ff_find_stream_index(s, sid);
801
            if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
802
                ff_asf_guid mediatype, subtype, formattype;
803
                int size;
804
                url_fskip(pb, 12);
805
                ff_get_guid(pb, &mediatype);
806
                ff_get_guid(pb, &subtype);
807
                url_fskip(pb, 12);
808
                ff_get_guid(pb, &formattype);
809
                size = get_le32(pb);
810
                parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
811
                consumed += 76 + size;
812
            }
813
        } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
814
                   !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
815
                   !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
816
                   !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
817
                   !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
818
                   !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
819
            int stream_index = ff_find_stream_index(s, sid);
820
            if (stream_index >= 0) {
821
                AVStream *st = s->streams[stream_index];
822
                uint8_t buf[258];
823
                const uint8_t *pbuf = buf;
824
                int buf_size;
825

    
826
                url_fskip(pb, 8);
827
                consumed += 8;
828
                if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
829
                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
830
                    url_fskip(pb, 6);
831
                    consumed += 6;
832
                }
833

    
834
                buf_size = FFMIN(len - consumed, sizeof(buf));
835
                get_buffer(pb, buf, buf_size);
836
                consumed += buf_size;
837
                ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
838
            }
839
        } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
840
            int stream_index = ff_find_stream_index(s, sid);
841
            if (stream_index >= 0) {
842
                url_fskip(pb, 12);
843
                if (get_le32(pb))
844
                    av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
845
                consumed += 16;
846
            }
847
        } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
848
            int stream_index = ff_find_stream_index(s, sid);
849
            if (stream_index >= 0) {
850
                AVStream *st = s->streams[stream_index];
851
                uint8_t language[4];
852
                url_fskip(pb, 12);
853
                get_buffer(pb, language, 3);
854
                if (language[0]) {
855
                    language[3] = 0;
856
                    av_metadata_set2(&st->metadata, "language", language, 0);
857
                }
858
                consumed += 15;
859
            }
860
        } else if (!ff_guidcmp(g, timestamp_guid)) {
861
            int stream_index = ff_find_stream_index(s, sid);
862
            if (stream_index >= 0) {
863
                url_fskip(pb, 8);
864
                wtv->pts = get_le64(pb);
865
                consumed += 16;
866
                if (wtv->pts == -1)
867
                    wtv->pts = AV_NOPTS_VALUE;
868
                else {
869
                    wtv->last_valid_pts = wtv->pts;
870
                    if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
871
                        wtv->epoch = wtv->pts;
872
                if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
873
#define WTV_PAD8(x) (((x) + 7) & ~7)
874
                    url_fskip(pb, WTV_PAD8(len) - consumed);
875
                    return 0;
876
                }
877
                }
878
            }
879
        } else if (!ff_guidcmp(g, data_guid)) {
880
            int stream_index = ff_find_stream_index(s, sid);
881
            if (mode == SEEK_TO_DATA && stream_index >= 0) {
882
                WtvStream *wst = s->streams[stream_index]->priv_data;
883
                wst->seen_data = 1;
884
                if (len_ptr) {
885
                    *len_ptr = len;
886
                }
887
                return stream_index;
888
            }
889
        } else if (
890
            !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}) ||
891
            !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}) ||
892
            !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}) ||
893
            !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}) ||
894
            !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}) ||
895
            !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}) ||
896
            !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}) ||
897
            !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}) ||
898
            !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}) ||
899
            !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}) ||
900
            !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}) ||
901
            !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
902
            !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
903
            !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
904
            !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
905
            !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
906
            !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
907
            !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
908
            !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
909
            //ignore known guids
910
        } else
911
            av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
912

    
913
        url_fskip(pb, WTV_PAD8(len) - consumed);
914
    }
915
    return AVERROR_EOF;
916
}
917

    
918
/* declare utf16le strings */
919
#define _ , 0,
920
static const uint8_t timeline_le16[] =
921
    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
922
static const uint8_t table_0_entries_legacy_attrib_le16[] =
923
    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
924
static const uint8_t table_0_entries_time_le16[] =
925
    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
926
static const uint8_t timeline_table_0_entries_Events_le16[] =
927
    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};
928
#undef _
929

    
930
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
931
{
932
    WtvContext *wtv = s->priv_data;
933
    int root_sector, root_size;
934
    uint8_t root[WTV_SECTOR_SIZE];
935
    ByteIOContext *pb;
936
    int64_t timeline_pos;
937
    int ret;
938

    
939
    wtv->epoch          =
940
    wtv->pts            =
941
    wtv->last_valid_pts = AV_NOPTS_VALUE;
942

    
943
    /* read root directory sector */
944
    url_fskip(s->pb, 0x30);
945
    root_size = get_le32(s->pb);
946
    if (root_size > sizeof(root)) {
947
        av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
948
        return AVERROR_INVALIDDATA;
949
    }
950
    url_fskip(s->pb, 4);
951
    root_sector = get_le32(s->pb);
952

    
953
    url_fseek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
954
    root_size = get_buffer(s->pb, root, root_size);
955
    if (root_size < 0)
956
        return AVERROR_INVALIDDATA;
957

    
958
    /* parse chunks up until first data chunk */
959
    wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
960
    if (!wtv->pb) {
961
        av_log(s, AV_LOG_ERROR, "timeline data missing\n");
962
        return AVERROR_INVALIDDATA;
963
    }
964

    
965
    ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
966
    if (ret < 0)
967
        return ret;
968
    url_fseek(wtv->pb, -32, SEEK_CUR);
969

    
970
    timeline_pos = url_ftell(s->pb); // save before opening another file
971

    
972
    /* read metadata */
973
    pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
974
    if (pb) {
975
        parse_legacy_attrib(s, pb);
976
        wtvfile_close(pb);
977
    }
978

    
979
    /* read seek index */
980
    if (s->nb_streams) {
981
        AVStream *st = s->streams[0];
982
        pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
983
        if (pb) {
984
            while(1) {
985
                uint64_t timestamp = get_le64(pb);
986
                uint64_t frame_nb  = get_le64(pb);
987
                if (url_feof(pb))
988
                    break;
989
                ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
990
                                   0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
991
            }
992
            wtvfile_close(pb);
993

    
994
            if (wtv->nb_index_entries) {
995
                pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
996
                if (pb) {
997
                    int i;
998
                    while (1) {
999
                        uint64_t frame_nb = get_le64(pb);
1000
                        uint64_t position = get_le64(pb);
1001
                        if (url_feof(pb))
1002
                            break;
1003
                        for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1004
                            AVIndexEntry *e = wtv->index_entries + i;
1005
                            if (frame_nb > e->size)
1006
                                break;
1007
                            if (position > e->pos)
1008
                                e->pos = position;
1009
                        }
1010
                    }
1011
                    wtvfile_close(pb);
1012
                    st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1013
                }
1014
            }
1015
        }
1016
    }
1017

    
1018
    url_fseek(s->pb, timeline_pos, SEEK_SET);
1019
    return 0;
1020
}
1021

    
1022
static int read_packet(AVFormatContext *s, AVPacket *pkt)
1023
{
1024
    WtvContext *wtv = s->priv_data;
1025
    ByteIOContext *pb = wtv->pb;
1026
    int stream_index, len, ret;
1027

    
1028
    stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1029
    if (stream_index < 0)
1030
        return stream_index;
1031

    
1032
    ret = av_get_packet(pb, pkt, len - 32);
1033
    if (ret < 0)
1034
        return ret;
1035
    pkt->stream_index = stream_index;
1036
    pkt->pts          = wtv->pts;
1037
    url_fskip(pb, WTV_PAD8(len) - len);
1038
    return 0;
1039
}
1040

    
1041
static int read_seek(AVFormatContext *s, int stream_index,
1042
                     int64_t ts, int flags)
1043
{
1044
    WtvContext *wtv = s->priv_data;
1045
    ByteIOContext *pb = wtv->pb;
1046
    AVStream *st = s->streams[0];
1047
    int64_t ts_relative;
1048
    int i;
1049

    
1050
    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1051
        return AVERROR_NOTSUPP;
1052

    
1053
    /* timestamp adjustment is required because wtv->pts values are absolute,
1054
     * whereas AVIndexEntry->timestamp values are relative to epoch. */
1055
    ts_relative = ts;
1056
    if (wtv->epoch != AV_NOPTS_VALUE)
1057
        ts_relative -= wtv->epoch;
1058

    
1059
    i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1060
    if (i < 0) {
1061
        if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1062
            url_fseek(pb, 0, SEEK_SET);
1063
        else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1064
            url_fseek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1065
        if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1066
            return AVERROR(ERANGE);
1067
        return 0;
1068
    }
1069
    wtv->pts = wtv->index_entries[i].timestamp;
1070
    if (wtv->epoch != AV_NOPTS_VALUE)
1071
        wtv->pts += wtv->epoch;
1072
    wtv->last_valid_pts = wtv->pts;
1073
    url_fseek(pb, wtv->index_entries[i].pos, SEEK_SET);
1074
    return 0;
1075
}
1076

    
1077
static int read_close(AVFormatContext *s)
1078
{
1079
    WtvContext *wtv = s->priv_data;
1080
    wtvfile_close(wtv->pb);
1081
    return 0;
1082
}
1083

    
1084
AVInputFormat ff_wtv_demuxer = {
1085
    .name           = "wtv",
1086
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1087
    .priv_data_size = sizeof(WtvContext),
1088
    .read_probe     = read_probe,
1089
    .read_header    = read_header,
1090
    .read_packet    = read_packet,
1091
    .read_seek      = read_seek,
1092
    .read_close     = read_close,
1093
    .flags          = AVFMT_SHOW_IDS,
1094
};