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1
/*
2
 * Windows Television (WTV) demuxer
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 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
4
 *
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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"
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#include <strings.h>
36

    
37
/* Macros for formating GUIDs */
38
#define PRI_GUID \
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    "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
40
#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]
42

    
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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
48

    
49
/*
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 *
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 * File system routines
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 *
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 */
54

    
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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
58

    
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typedef struct {
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    ByteIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
61

    
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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 */
65

    
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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;
70

    
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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;
79

    
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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;
84

    
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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);
90

    
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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;
103
                break;
104
            }
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        }
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    }
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    return nread;
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}
109

    
110
/**
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 * @return position (or file length)
112
 */
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static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
114
{
115
    WtvFile *wf = opaque;
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    ByteIOContext *pb = wf->pb_filesystem;
117

    
118
    if (whence == AVSEEK_SIZE)
119
        return wf->length;
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    else if (whence == SEEK_CUR)
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        offset = wf->position + offset;
122
    else if (whence == SEEK_END)
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        offset = wf->length;
124

    
125
    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;
128
    wf->position = offset;
129
    return offset;
130
}
131

    
132
/**
133
 * read non-zero integers (le32) from input stream
134
 * @param pb
135
 * @param[out] data destination
136
 * @param     count maximum number of integers to read
137
 * @return    total number of integers read
138
 */
139
static int read_ints(ByteIOContext *pb, uint32_t *data, int count)
140
{
141
    int i, total = 0;
142
    for (i = 0; i < count; i++) {
143
        if ((data[total] = get_le32(pb)))
144
           total++;
145
    }
146
    return total;
147
}
148

    
149
/**
150
 * Open file
151
 * @param first_sector  First sector
152
 * @param length        Length of file (bytes)
153
 * @param depth         File allocation table depth
154
 * @return NULL on error
155
 */
156
static ByteIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
157
{
158
    ByteIOContext *pb;
159
    WtvFile *wf;
160
    uint8_t *buffer;
161

    
162
    if (url_fseek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
163
        return NULL;
164

    
165
    wf = av_mallocz(sizeof(WtvFile));
166
    if (!wf)
167
        return NULL;
168

    
169
    if (depth == 0) {
170
        wf->sectors = av_malloc(sizeof(uint32_t));
171
        if (!wf->sectors) {
172
            av_free(wf);
173
            return NULL;
174
        }
175
        wf->sectors[0]  = first_sector;
176
        wf->nb_sectors  = 1;
177
        wf->sector_bits = WTV_SECTOR_BITS;
178
    } else if (depth == 1) {
179
        wf->sectors = av_malloc(WTV_SECTOR_SIZE);
180
        if (!wf->sectors) {
181
            av_free(wf);
182
            return NULL;
183
        }
184
        wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
185
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
186
    } else if (depth == 2) {
187
        uint32_t sectors1[WTV_SECTOR_SIZE / 4];
188
        int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
189
        int i;
190

    
191
        wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
192
        if (!wf->sectors) {
193
            av_free(wf);
194
            return NULL;
195
        }
196
        wf->nb_sectors = 0;
197
        for (i = 0; i < nb_sectors1; i++) {
198
            if (url_fseek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
199
                break;
200
            wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
201
        }
202
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
203
    } else {
204
        av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
205
        av_free(wf);
206
        return NULL;
207
    }
208

    
209
    if (!wf->nb_sectors) {
210
        av_free(wf->sectors);
211
        av_free(wf);
212
        return NULL;
213
    }
214

    
215
    /* check length */
216
    length &= 0xFFFFFFFFFFFF;
217
    if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
218
        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);
219
        length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
220
    }
221
    wf->length = length;
222

    
223
    /* seek to intial sector */
224
    wf->position = 0;
225
    if (url_fseek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
226
        av_free(wf->sectors);
227
        av_free(wf);
228
        return NULL;
229
    }
230

    
231
    wf->pb_filesystem = s->pb;
232
    buffer = av_malloc(1 << wf->sector_bits);
233
    if (!buffer) {
234
        av_free(wf->sectors);
235
        av_free(wf);
236
        return NULL;
237
    }
238

    
239
    pb = av_alloc_put_byte(buffer, 1 << wf->sector_bits, 0, wf,
240
                           wtvfile_read_packet, NULL, wtvfile_seek);
241
    if (!pb) {
242
        av_free(buffer);
243
        av_free(wf->sectors);
244
        av_free(wf);
245
    }
246
    return pb;
247
}
248

    
249
static const ff_asf_guid dir_entry_guid =
250
    {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
251

    
252
/**
253
 * Open file using filename
254
 * @param[in]  buf       directory buffer
255
 * @param      buf_size  directory buffer size
256
 * @param[in]  filename
257
 * @param      filename_size size of filename
258
 * @return NULL on error
259
 */
260
static ByteIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
261
{
262
    const uint8_t *buf_end = buf + buf_size;
263

    
264
    while(buf + 48 <= buf_end) {
265
        int dir_length, name_size, first_sector, depth;
266
        uint64_t file_length;
267
        const uint8_t *name;
268
        if (ff_guidcmp(buf, dir_entry_guid)) {
269
            av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
270
                   "remaining directory entries ignored\n", ARG_GUID(buf));
271
            break;
272
        }
273
        dir_length  = AV_RL16(buf + 16);
274
        file_length = AV_RL64(buf + 24);
275
        name_size   = 2 * AV_RL32(buf + 32);
276
        if (buf + 48 + name_size > buf_end) {
277
            av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
278
            break;
279
        }
280
        first_sector = AV_RL32(buf + 40 + name_size);
281
        depth        = AV_RL32(buf + 44 + name_size);
282

    
283
        /* compare file name; test optional null terminator */
284
        name = buf + 40;
285
        if (name_size >= filename_size &&
286
            !memcmp(name, filename, filename_size) &&
287
            (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
288
            return wtvfile_open_sector(first_sector, file_length, depth, s);
289

    
290
        buf += dir_length;
291
    }
292
    return 0;
293
}
294

    
295
#define wtvfile_open(s, buf, buf_size, filename) \
296
    wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
297

    
298
/**
299
 * Close file opened with wtvfile_open_sector(), or wtv_open()
300
 */
301
static void wtvfile_close(ByteIOContext *pb)
302
{
303
    WtvFile *wf = pb->opaque;
304
    av_free(wf->sectors);
305
    av_free(pb);
306
}
307

    
308
/*
309
 *
310
 * Main demuxer
311
 *
312
 */
313

    
314
typedef struct {
315
    int seen_data;
316
} WtvStream;
317

    
318
typedef struct {
319
    ByteIOContext *pb;       /** timeline file */
320
    int64_t epoch;
321
    int64_t pts;             /** pts for next data chunk */
322
    int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
323

    
324
    /* maintain private seek index, as the AVIndexEntry->pos is relative to the
325
       start of the 'timeline' file, not the file system (AVFormatContext->pb) */
326
    AVIndexEntry *index_entries;
327
    int nb_index_entries;
328
    unsigned int index_entries_allocated_size;
329
} WtvContext;
330

    
331
typedef struct {
332
    enum CodecID id;
333
    ff_asf_guid guid;
334
} AVCodecGuid;
335

    
336
static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
337
{
338
    int i;
339
    for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
340
        if (!ff_guidcmp(guids[i].guid, guid))
341
            return guids[i].id;
342
    }
343
    return CODEC_ID_NONE;
344
}
345

    
346
/* WTV GUIDs */
347
static const ff_asf_guid wtv_guid =
348
    {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
349
static const ff_asf_guid metadata_guid =
350
    {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
351
static const ff_asf_guid timestamp_guid =
352
    {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
353
static const ff_asf_guid data_guid =
354
    {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
355
static const ff_asf_guid stream_guid =
356
    {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
357
static const ff_asf_guid stream2_guid =
358
    {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
359
static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
360
    {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
361
static const ff_asf_guid EVENTID_LanguageSpanningEvent =
362
    {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
363
static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
364
    {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
365
static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
366
    {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
367
static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
368
    {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
369
static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
370
    {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
371
static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
372
    {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
373
static const ff_asf_guid EVENTID_TeletextSpanningEvent =
374
    {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
375
static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
376
    {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
377

    
378
/* Windows media GUIDs */
379

    
380
#define MEDIASUBTYPE_BASE_GUID \
381
    0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
382

    
383
/* Media types */
384
static const ff_asf_guid mediatype_audio =
385
    {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
386
static const ff_asf_guid mediatype_video =
387
    {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
388
static const ff_asf_guid mediasubtype_mpeg1payload =
389
    {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
390
static const ff_asf_guid mediatype_mpeg2_sections =
391
    {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
392
static const ff_asf_guid mediatype_mpeg2_pes =
393
    {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
394
static const ff_asf_guid mediatype_mstvcaption =
395
    {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
396

    
397
/* Media subtypes */
398
static const ff_asf_guid mediasubtype_cpfilters_processed =
399
    {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
400
static const ff_asf_guid mediasubtype_dvb_subtitle =
401
    {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
402
static const ff_asf_guid mediasubtype_teletext =
403
    {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
404
static const ff_asf_guid mediasubtype_dtvccdata =
405
    {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
406
static const ff_asf_guid mediasubtype_mpeg2_sections =
407
    {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
408

    
409
/* Formats */
410
static const ff_asf_guid format_cpfilters_processed =
411
    {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
412
static const ff_asf_guid format_waveformatex =
413
    {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
414
static const ff_asf_guid format_videoinfo2 =
415
    {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
416
static const ff_asf_guid format_mpeg2_video =
417
    {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
418
static const ff_asf_guid format_none =
419
    {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
420

    
421
static const AVCodecGuid video_guids[] = {
422
    {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
423
    {CODEC_ID_NONE}
424
};
425

    
426
static const AVCodecGuid audio_guids[] = {
427
    {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
428
    {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
429
    {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
430
    {CODEC_ID_NONE}
431
};
432

    
433
static int read_probe(AVProbeData *p)
434
{
435
    return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
436
}
437

    
438
/**
439
 * Convert win32 FILETIME to ISO-8601 string
440
 */
441
static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
442
{
443
    time_t t = (value / 10000000LL) - 11644473600LL;
444
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
445
}
446

    
447
/**
448
 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
449
 */
450
static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
451
{
452
    time_t t = (value / 10000000LL) - 719162LL*86400LL;
453
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
454
}
455

    
456
/**
457
 * Convert OLE DATE to ISO-8601 string
458
 */
459
static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
460
{
461
    time_t t = 631112400LL + 86400*av_int2dbl(value);
462
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
463
}
464

    
465
static void get_attachment(AVFormatContext *s, ByteIOContext *pb, int length)
466
{
467
    char mime[1024];
468
    char description[1024];
469
    unsigned int filesize;
470
    AVStream *st;
471
    int64_t pos = url_ftell(pb);
472

    
473
    avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
474
    if (strcmp(mime, "image/jpeg"))
475
        goto done;
476

    
477
    get_byte(pb);
478
    avio_get_str16le(pb, INT_MAX, description, sizeof(description));
479
    filesize = get_le32(pb);
480
    if (!filesize)
481
        goto done;
482

    
483
    st = av_new_stream(s, 0);
484
    if (!st)
485
        goto done;
486
    av_metadata_set2(&st->metadata, "title", description, 0);
487
    st->codec->codec_id   = CODEC_ID_MJPEG;
488
    st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
489
    st->codec->extradata  = av_mallocz(filesize);
490
    if (!st->codec->extradata)
491
        goto done;
492
    st->codec->extradata_size = filesize;
493
    get_buffer(pb, st->codec->extradata, filesize);
494
done:
495
    url_fseek(pb, pos + length, SEEK_SET);
496
}
497

    
498
static void get_tag(AVFormatContext *s, ByteIOContext *pb, const char *key, int type, int length)
499
{
500
    int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
501
    char *buf = av_malloc(buf_size);
502
    if (!buf)
503
        return;
504

    
505
    if (type == 0 && length == 4) {
506
        snprintf(buf, buf_size, "%"PRIi32, get_le32(pb));
507
    } else if (type == 1) {
508
        avio_get_str16le(pb, length, buf, buf_size);
509
        if (!strlen(buf)) {
510
           av_free(buf);
511
           return;
512
        }
513
    } else if (type == 3 && length == 4) {
514
        strcpy(buf, get_le32(pb) ? "true" : "false");
515
    } else if (type == 4 && length == 8) {
516
        int64_t num = get_le64(pb);
517
        if (!strcmp(key, "WM/EncodingTime") ||
518
            !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
519
            filetime_to_iso8601(buf, buf_size, num);
520
        else if (!strcmp(key, "WM/WMRVEncodeTime") ||
521
                 !strcmp(key, "WM/WMRVEndTime"))
522
            crazytime_to_iso8601(buf, buf_size, num);
523
        else if (!strcmp(key, "WM/WMRVExpirationDate"))
524
            oledate_to_iso8601(buf, buf_size, num);
525
        else if (!strcmp(key, "WM/WMRVBitrate"))
526
            snprintf(buf, buf_size, "%f", av_int2dbl(num));
527
        else
528
            snprintf(buf, buf_size, "%"PRIi64, num);
529
    } else if (type == 5 && length == 2) {
530
        snprintf(buf, buf_size, "%"PRIi16, get_le16(pb));
531
    } else if (type == 6 && length == 16) {
532
        ff_asf_guid guid;
533
        get_buffer(pb, guid, 16);
534
        snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
535
    } else if (type == 2 && !strcmp(key, "WM/Picture")) {
536
        get_attachment(s, pb, length);
537
        av_freep(&buf);
538
        return;
539
    } else {
540
        av_freep(&buf);
541
        av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
542
        url_fskip(pb, length);
543
        return;
544
    }
545

    
546
    av_metadata_set2(&s->metadata, key, buf, 0);
547
    av_freep(&buf);
548
}
549

    
550
/**
551
 * Parse metadata entries
552
 */
553
static void parse_legacy_attrib(AVFormatContext *s, ByteIOContext *pb)
554
{
555
    ff_asf_guid guid;
556
    int length, type;
557
    while(!url_feof(pb)) {
558
        char key[1024];
559
        ff_get_guid(pb, &guid);
560
        type   = get_le32(pb);
561
        length = get_le32(pb);
562
        if (!length)
563
            break;
564
        if (ff_guidcmp(&guid, metadata_guid)) {
565
            av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
566
                   "remaining metadata entries ignored\n", ARG_GUID(guid));
567
            break;
568
        }
569
        avio_get_str16le(pb, INT_MAX, key, sizeof(key));
570
        get_tag(s, pb, key, type, length);
571
    }
572

    
573
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
574
}
575

    
576
/**
577
 * parse VIDEOINFOHEADER2 structure
578
 * @return bytes consumed
579
 */
580
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
581
{
582
    WtvContext *wtv = s->priv_data;
583
    ByteIOContext *pb = wtv->pb;
584

    
585
    url_fskip(pb, 72);  // picture aspect ratio is unreliable
586
    ff_get_bmp_header(pb, st);
587

    
588
    return 72 + 40;
589
}
590

    
591
/**
592
 * Parse MPEG1WAVEFORMATEX extradata structure
593
 */
594
static void parse_mpeg1waveformatex(AVStream *st)
595
{
596
    /* fwHeadLayer */
597
    switch (AV_RL16(st->codec->extradata)) {
598
    case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
599
    case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
600
    case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
601
    }
602

    
603
    st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
604

    
605
    /* dwHeadMode */
606
    switch (AV_RL16(st->codec->extradata + 6)) {
607
    case 1 : case 2 : case 4 : st->codec->channels = 2; break;
608
    case 8 :                   st->codec->channels = 1; break;
609
    }
610
}
611

    
612
/**
613
 * Initialise stream
614
 * @param st Stream to initialise, or NULL to create and initialise new stream
615
 * @return NULL on error
616
 */
617
static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
618
{
619
    if (st) {
620
        if (st->codec->extradata) {
621
            av_freep(&st->codec->extradata);
622
            st->codec->extradata_size = 0;
623
        }
624
    } else {
625
        WtvStream *wst = av_mallocz(sizeof(WtvStream));
626
        if (!wst)
627
            return NULL;
628
        st = av_new_stream(s, sid);
629
        if (!st)
630
            return NULL;
631
        st->priv_data = wst;
632
    }
633
    st->codec->codec_type = codec_type;
634
    st->need_parsing      = AVSTREAM_PARSE_FULL;
635
    av_set_pts_info(st, 64, 1, 10000000);
636
    return st;
637
}
638

    
639
/**
640
 * parse Media Type structure and populate stream
641
 * @param st         Stream, or NULL to create new stream
642
 * @param mediatype  Mediatype GUID
643
 * @param subtype    Subtype GUID
644
 * @param formattype Format GUID
645
 * @param size       Size of format buffer
646
 * @return NULL on error
647
 */
648
static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
649
                                   ff_asf_guid mediatype, ff_asf_guid subtype,
650
                                   ff_asf_guid formattype, int size)
651
{
652
    WtvContext *wtv = s->priv_data;
653
    ByteIOContext *pb = wtv->pb;
654
    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
655
        !ff_guidcmp(formattype, format_cpfilters_processed)) {
656
        ff_asf_guid actual_subtype;
657
        ff_asf_guid actual_formattype;
658

    
659
        if (size < 32) {
660
            av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
661
            url_fskip(pb, size);
662
            return NULL;
663
        }
664

    
665
        url_fskip(pb, size - 32);
666
        ff_get_guid(pb, &actual_subtype);
667
        ff_get_guid(pb, &actual_formattype);
668
        url_fseek(pb, -size, SEEK_CUR);
669

    
670
        st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
671
        url_fskip(pb, 32);
672
        return st;
673
    } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
674
        st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
675
        if (!st)
676
            return NULL;
677
        if (!ff_guidcmp(formattype, format_waveformatex)) {
678
            ff_get_wav_header(pb, st->codec, size);
679
        } else {
680
            if (ff_guidcmp(formattype, format_none))
681
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
682
            url_fskip(pb, size);
683
        }
684

    
685
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
686
            st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
687
        } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
688
            if (st->codec->extradata && st->codec->extradata_size >= 22)
689
                parse_mpeg1waveformatex(st);
690
            else
691
                av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
692
        } else {
693
            st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
694
            if (st->codec->codec_id == CODEC_ID_NONE)
695
                av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
696
        }
697
        return st;
698
    } else if (!ff_guidcmp(mediatype, mediatype_video)) {
699
        st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
700
        if (!st)
701
            return NULL;
702
        if (!ff_guidcmp(formattype, format_videoinfo2)) {
703
            int consumed = parse_videoinfoheader2(s, st);
704
            url_fskip(pb, FFMAX(size - consumed, 0));
705
        } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
706
            int consumed = parse_videoinfoheader2(s, st);
707
            url_fskip(pb, FFMAX(size - consumed, 0));
708
        } else {
709
            if (ff_guidcmp(formattype, format_none))
710
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
711
            url_fskip(pb, size);
712
        }
713

    
714
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
715
            st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
716
        } else {
717
            st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
718
        }
719
        if (st->codec->codec_id == CODEC_ID_NONE)
720
            av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
721
        return st;
722
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
723
               !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
724
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
725
        if (!st)
726
            return NULL;
727
        if (ff_guidcmp(formattype, format_none))
728
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
729
        url_fskip(pb, size);
730
        st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
731
        return st;
732
    } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
733
               (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
734
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
735
        if (!st)
736
            return NULL;
737
        if (ff_guidcmp(formattype, format_none))
738
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
739
        url_fskip(pb, size);
740
        st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
741
        return st;
742
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
743
               !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
744
        if (ff_guidcmp(formattype, format_none))
745
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
746
        url_fskip(pb, size);
747
        return NULL;
748
    }
749

    
750
    av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
751
                              ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
752
                              ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
753
    url_fskip(pb, size);
754
    return NULL;
755
}
756

    
757
enum {
758
    SEEK_TO_DATA = 0,
759
    SEEK_TO_PTS,
760
};
761

    
762
/**
763
 * Parse WTV chunks
764
 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
765
 * @param seekts timestamp
766
 * @param[out] len Length of data chunk
767
 * @return stream index of data chunk, or <0 on error
768
 */
769
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
770
{
771
    WtvContext *wtv = s->priv_data;
772
    ByteIOContext *pb = wtv->pb;
773
    while (!url_feof(pb)) {
774
        ff_asf_guid g;
775
        int len, sid, consumed;
776

    
777
        ff_get_guid(pb, &g);
778
        len = get_le32(pb);
779
        if (len < 32)
780
            break;
781
        sid = get_le32(pb) & 0x7FFF;
782
        url_fskip(pb, 8);
783
        consumed = 32;
784

    
785
        if (!ff_guidcmp(g, stream_guid)) {
786
            if (ff_find_stream_index(s, sid) < 0) {
787
                ff_asf_guid mediatype, subtype, formattype;
788
                int size;
789
                url_fskip(pb, 28);
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 += 92 + size;
797
            }
798
        } else if (!ff_guidcmp(g, stream2_guid)) {
799
            int stream_index = ff_find_stream_index(s, sid);
800
            if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
801
                ff_asf_guid mediatype, subtype, formattype;
802
                int size;
803
                url_fskip(pb, 12);
804
                ff_get_guid(pb, &mediatype);
805
                ff_get_guid(pb, &subtype);
806
                url_fskip(pb, 12);
807
                ff_get_guid(pb, &formattype);
808
                size = get_le32(pb);
809
                parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
810
                consumed += 76 + size;
811
            }
812
        } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
813
                   !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
814
                   !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
815
                   !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
816
                   !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
817
                   !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
818
            int stream_index = ff_find_stream_index(s, sid);
819
            if (stream_index >= 0) {
820
                AVStream *st = s->streams[stream_index];
821
                uint8_t buf[258];
822
                const uint8_t *pbuf = buf;
823
                int buf_size;
824

    
825
                url_fskip(pb, 8);
826
                consumed += 8;
827
                if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
828
                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
829
                    url_fskip(pb, 6);
830
                    consumed += 6;
831
                }
832

    
833
                buf_size = FFMIN(len - consumed, sizeof(buf));
834
                get_buffer(pb, buf, buf_size);
835
                consumed += buf_size;
836
                ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
837
            }
838
        } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
839
            int stream_index = ff_find_stream_index(s, sid);
840
            if (stream_index >= 0) {
841
                AVStream *st = s->streams[stream_index];
842
                int audio_type;
843
                url_fskip(pb, 8);
844
                audio_type = get_byte(pb);
845
                if (audio_type == 2)
846
                    st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
847
                else if (audio_type == 3)
848
                    st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
849
                consumed += 9;
850
            }
851
        } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
852
            int stream_index = ff_find_stream_index(s, sid);
853
            if (stream_index >= 0) {
854
                url_fskip(pb, 12);
855
                if (get_le32(pb))
856
                    av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
857
                consumed += 16;
858
            }
859
        } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
860
            int stream_index = ff_find_stream_index(s, sid);
861
            if (stream_index >= 0) {
862
                AVStream *st = s->streams[stream_index];
863
                uint8_t language[4];
864
                url_fskip(pb, 12);
865
                get_buffer(pb, language, 3);
866
                if (language[0]) {
867
                    language[3] = 0;
868
                    av_metadata_set2(&st->metadata, "language", language, 0);
869
                    if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
870
                        st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
871
                }
872
                consumed += 15;
873
            }
874
        } else if (!ff_guidcmp(g, timestamp_guid)) {
875
            int stream_index = ff_find_stream_index(s, sid);
876
            if (stream_index >= 0) {
877
                url_fskip(pb, 8);
878
                wtv->pts = get_le64(pb);
879
                consumed += 16;
880
                if (wtv->pts == -1)
881
                    wtv->pts = AV_NOPTS_VALUE;
882
                else {
883
                    wtv->last_valid_pts = wtv->pts;
884
                    if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
885
                        wtv->epoch = wtv->pts;
886
                if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
887
#define WTV_PAD8(x) (((x) + 7) & ~7)
888
                    url_fskip(pb, WTV_PAD8(len) - consumed);
889
                    return 0;
890
                }
891
                }
892
            }
893
        } else if (!ff_guidcmp(g, data_guid)) {
894
            int stream_index = ff_find_stream_index(s, sid);
895
            if (mode == SEEK_TO_DATA && stream_index >= 0) {
896
                WtvStream *wst = s->streams[stream_index]->priv_data;
897
                wst->seen_data = 1;
898
                if (len_ptr) {
899
                    *len_ptr = len;
900
                }
901
                return stream_index;
902
            }
903
        } else if (
904
            !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}) ||
905
            !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}) ||
906
            !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}) ||
907
            !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}) ||
908
            !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}) ||
909
            !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}) ||
910
            !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}) ||
911
            !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}) ||
912
            !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}) ||
913
            !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}) ||
914
            !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
915
            !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
916
            !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
917
            !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
918
            !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
919
            !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
920
            !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
921
            !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
922
            //ignore known guids
923
        } else
924
            av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
925

    
926
        url_fskip(pb, WTV_PAD8(len) - consumed);
927
    }
928
    return AVERROR_EOF;
929
}
930

    
931
/* declare utf16le strings */
932
#define _ , 0,
933
static const uint8_t timeline_le16[] =
934
    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
935
static const uint8_t table_0_entries_legacy_attrib_le16[] =
936
    {'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};
937
static const uint8_t table_0_entries_time_le16[] =
938
    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
939
static const uint8_t timeline_table_0_entries_Events_le16[] =
940
    {'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};
941
#undef _
942

    
943
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
944
{
945
    WtvContext *wtv = s->priv_data;
946
    int root_sector, root_size;
947
    uint8_t root[WTV_SECTOR_SIZE];
948
    ByteIOContext *pb;
949
    int64_t timeline_pos;
950
    int ret;
951

    
952
    wtv->epoch          =
953
    wtv->pts            =
954
    wtv->last_valid_pts = AV_NOPTS_VALUE;
955

    
956
    /* read root directory sector */
957
    url_fskip(s->pb, 0x30);
958
    root_size = get_le32(s->pb);
959
    if (root_size > sizeof(root)) {
960
        av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
961
        return AVERROR_INVALIDDATA;
962
    }
963
    url_fskip(s->pb, 4);
964
    root_sector = get_le32(s->pb);
965

    
966
    url_fseek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
967
    root_size = get_buffer(s->pb, root, root_size);
968
    if (root_size < 0)
969
        return AVERROR_INVALIDDATA;
970

    
971
    /* parse chunks up until first data chunk */
972
    wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
973
    if (!wtv->pb) {
974
        av_log(s, AV_LOG_ERROR, "timeline data missing\n");
975
        return AVERROR_INVALIDDATA;
976
    }
977

    
978
    ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
979
    if (ret < 0)
980
        return ret;
981
    url_fseek(wtv->pb, -32, SEEK_CUR);
982

    
983
    timeline_pos = url_ftell(s->pb); // save before opening another file
984

    
985
    /* read metadata */
986
    pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
987
    if (pb) {
988
        parse_legacy_attrib(s, pb);
989
        wtvfile_close(pb);
990
    }
991

    
992
    /* read seek index */
993
    if (s->nb_streams) {
994
        AVStream *st = s->streams[0];
995
        pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
996
        if (pb) {
997
            while(1) {
998
                uint64_t timestamp = get_le64(pb);
999
                uint64_t frame_nb  = get_le64(pb);
1000
                if (url_feof(pb))
1001
                    break;
1002
                ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1003
                                   0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1004
            }
1005
            wtvfile_close(pb);
1006

    
1007
            if (wtv->nb_index_entries) {
1008
                pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1009
                if (pb) {
1010
                    int i;
1011
                    while (1) {
1012
                        uint64_t frame_nb = get_le64(pb);
1013
                        uint64_t position = get_le64(pb);
1014
                        if (url_feof(pb))
1015
                            break;
1016
                        for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1017
                            AVIndexEntry *e = wtv->index_entries + i;
1018
                            if (frame_nb > e->size)
1019
                                break;
1020
                            if (position > e->pos)
1021
                                e->pos = position;
1022
                        }
1023
                    }
1024
                    wtvfile_close(pb);
1025
                    st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1026
                }
1027
            }
1028
        }
1029
    }
1030

    
1031
    url_fseek(s->pb, timeline_pos, SEEK_SET);
1032
    return 0;
1033
}
1034

    
1035
static int read_packet(AVFormatContext *s, AVPacket *pkt)
1036
{
1037
    WtvContext *wtv = s->priv_data;
1038
    ByteIOContext *pb = wtv->pb;
1039
    int stream_index, len, ret;
1040

    
1041
    stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1042
    if (stream_index < 0)
1043
        return stream_index;
1044

    
1045
    ret = av_get_packet(pb, pkt, len - 32);
1046
    if (ret < 0)
1047
        return ret;
1048
    pkt->stream_index = stream_index;
1049
    pkt->pts          = wtv->pts;
1050
    url_fskip(pb, WTV_PAD8(len) - len);
1051
    return 0;
1052
}
1053

    
1054
static int read_seek(AVFormatContext *s, int stream_index,
1055
                     int64_t ts, int flags)
1056
{
1057
    WtvContext *wtv = s->priv_data;
1058
    ByteIOContext *pb = wtv->pb;
1059
    AVStream *st = s->streams[0];
1060
    int64_t ts_relative;
1061
    int i;
1062

    
1063
    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1064
        return AVERROR_NOTSUPP;
1065

    
1066
    /* timestamp adjustment is required because wtv->pts values are absolute,
1067
     * whereas AVIndexEntry->timestamp values are relative to epoch. */
1068
    ts_relative = ts;
1069
    if (wtv->epoch != AV_NOPTS_VALUE)
1070
        ts_relative -= wtv->epoch;
1071

    
1072
    i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1073
    if (i < 0) {
1074
        if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1075
            url_fseek(pb, 0, SEEK_SET);
1076
        else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1077
            url_fseek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1078
        if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1079
            return AVERROR(ERANGE);
1080
        return 0;
1081
    }
1082
    wtv->pts = wtv->index_entries[i].timestamp;
1083
    if (wtv->epoch != AV_NOPTS_VALUE)
1084
        wtv->pts += wtv->epoch;
1085
    wtv->last_valid_pts = wtv->pts;
1086
    url_fseek(pb, wtv->index_entries[i].pos, SEEK_SET);
1087
    return 0;
1088
}
1089

    
1090
static int read_close(AVFormatContext *s)
1091
{
1092
    WtvContext *wtv = s->priv_data;
1093
    wtvfile_close(wtv->pb);
1094
    return 0;
1095
}
1096

    
1097
AVInputFormat ff_wtv_demuxer = {
1098
    .name           = "wtv",
1099
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1100
    .priv_data_size = sizeof(WtvContext),
1101
    .read_probe     = read_probe,
1102
    .read_header    = read_header,
1103
    .read_packet    = read_packet,
1104
    .read_seek      = read_seek,
1105
    .read_close     = read_close,
1106
    .flags          = AVFMT_SHOW_IDS,
1107
};