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ffmpeg / libavformat / wtv.c @ d3c0de86

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/*
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 * 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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 */
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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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 */
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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 "riff.h"
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#include "asf.h"
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#include "mpegts.h"
34

    
35
/* Macros for formating GUIDs */
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#define PRI_GUID \
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    "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
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#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]
40

    
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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
46

    
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/*
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 *
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 * File system routines
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 *
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 */
52

    
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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
56

    
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typedef struct {
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    ByteIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
59

    
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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 */
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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;
68

    
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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;
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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;
82

    
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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;
101
                break;
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            }
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        }
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    }
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    return nread;
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}
107

    
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/**
109
 * @return position (or file length)
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 */
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static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
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{
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    WtvFile *wf = opaque;
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    ByteIOContext *pb = wf->pb_filesystem;
115

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

    
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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;
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    wf->position = offset;
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    return offset;
128
}
129

    
130
/**
131
 * read non-zero integers (le32) from input stream
132
 * @param pb
133
 * @param[out] data destination
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 * @param     count maximum number of integers to read
135
 * @return    total number of integers read
136
 */
137
static int read_ints(ByteIOContext *pb, uint32_t *data, int count)
138
{
139
    int i, total = 0;
140
    for (i = 0; i < count; i++) {
141
        if ((data[total] = get_le32(pb)))
142
           total++;
143
    }
144
    return total;
145
}
146

    
147
/**
148
 * Open file
149
 * @param first_sector  First sector
150
 * @param length        Length of file (bytes)
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 * @param depth         File allocation table depth
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 * @return NULL on error
153
 */
154
static ByteIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
155
{
156
    ByteIOContext *pb;
157
    WtvFile *wf;
158
    uint8_t *buffer;
159

    
160
    if (url_fseek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
161
        return NULL;
162

    
163
    wf = av_mallocz(sizeof(WtvFile));
164
    if (!wf)
165
        return NULL;
166

    
167
    if (depth == 0) {
168
        wf->sectors = av_malloc(sizeof(uint32_t));
169
        if (!wf->sectors) {
170
            av_free(wf);
171
            return NULL;
172
        }
173
        wf->sectors[0]  = first_sector;
174
        wf->nb_sectors  = 1;
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        wf->sector_bits = WTV_SECTOR_BITS;
176
    } else if (depth == 1) {
177
        wf->sectors = av_malloc(WTV_SECTOR_SIZE);
178
        if (!wf->sectors) {
179
            av_free(wf);
180
            return NULL;
181
        }
182
        wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
183
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
184
    } else if (depth == 2) {
185
        uint32_t sectors1[WTV_SECTOR_SIZE / 4];
186
        int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
187
        int i;
188

    
189
        wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
190
        if (!wf->sectors) {
191
            av_free(wf);
192
            return NULL;
193
        }
194
        wf->nb_sectors = 0;
195
        for (i = 0; i < nb_sectors1; i++) {
196
            if (url_fseek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
197
                break;
198
            wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
199
        }
200
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
201
    } else {
202
        av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
203
        av_free(wf);
204
        return NULL;
205
    }
206

    
207
    if (!wf->nb_sectors) {
208
        av_free(wf->sectors);
209
        av_free(wf);
210
        return NULL;
211
    }
212

    
213
    /* check length */
214
    length &= 0xFFFFFFFFFFFF;
215
    if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
216
        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);
217
        length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
218
    }
219
    wf->length = length;
220

    
221
    /* seek to intial sector */
222
    wf->position = 0;
223
    if (url_fseek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
224
        av_free(wf->sectors);
225
        av_free(wf);
226
        return NULL;
227
    }
228

    
229
    wf->pb_filesystem = s->pb;
230
    buffer = av_malloc(1 << wf->sector_bits);
231
    if (!buffer) {
232
        av_free(wf->sectors);
233
        av_free(wf);
234
        return NULL;
235
    }
236

    
237
    pb = av_alloc_put_byte(buffer, 1 << wf->sector_bits, 0, wf,
238
                           wtvfile_read_packet, NULL, wtvfile_seek);
239
    if (!pb) {
240
        av_free(buffer);
241
        av_free(wf->sectors);
242
        av_free(wf);
243
    }
244
    return pb;
245
}
246

    
247
static const ff_asf_guid dir_entry_guid =
248
    {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
249

    
250
/**
251
 * Open file using filename
252
 * @param[in]  buf       directory buffer
253
 * @param      buf_size  directory buffer size
254
 * @param[in]  filename
255
 * @param      filename_size size of filename
256
 * @return NULL on error
257
 */
258
static ByteIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
259
{
260
    const uint8_t *buf_end = buf + buf_size;
261

    
262
    while(buf + 48 <= buf_end) {
263
        int dir_length, name_size, first_sector, depth;
264
        uint64_t file_length;
265
        const uint8_t *name;
266
        if (ff_guidcmp(buf, dir_entry_guid)) {
267
            av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
268
                   "remaining directory entries ignored\n", ARG_GUID(buf));
269
            break;
270
        }
271
        dir_length  = AV_RL16(buf + 16);
272
        file_length = AV_RL64(buf + 24);
273
        name_size   = 2 * AV_RL32(buf + 32);
274
        if (buf + 48 + name_size > buf_end) {
275
            av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
276
            break;
277
        }
278
        first_sector = AV_RL32(buf + 40 + name_size);
279
        depth        = AV_RL32(buf + 44 + name_size);
280

    
281
        /* compare file name; test optional null terminator */
282
        name = buf + 40;
283
        if (name_size >= filename_size &&
284
            !memcmp(name, filename, filename_size) &&
285
            (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
286
            return wtvfile_open_sector(first_sector, file_length, depth, s);
287

    
288
        buf += dir_length;
289
    }
290
    return 0;
291
}
292

    
293
#define wtvfile_open(s, buf, buf_size, filename) \
294
    wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
295

    
296
/**
297
 * Close file opened with wtvfile_open_sector(), or wtv_open()
298
 */
299
static void wtvfile_close(ByteIOContext *pb)
300
{
301
    WtvFile *wf = pb->opaque;
302
    av_free(wf->sectors);
303
    av_free(pb);
304
}
305

    
306
/*
307
 *
308
 * Main demuxer
309
 *
310
 */
311

    
312
typedef struct {
313
    int seen_data;
314
} WtvStream;
315

    
316
typedef struct {
317
    ByteIOContext *pb;       /** timeline file */
318
    int64_t epoch;
319
    int64_t pts;             /** pts for next data chunk */
320
    int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
321

    
322
    /* maintain private seek index, as the AVIndexEntry->pos is relative to the
323
       start of the 'timeline' file, not the file system (AVFormatContext->pb) */
324
    AVIndexEntry *index_entries;
325
    int nb_index_entries;
326
    unsigned int index_entries_allocated_size;
327
} WtvContext;
328

    
329
typedef struct {
330
    enum CodecID id;
331
    ff_asf_guid guid;
332
} AVCodecGuid;
333

    
334
static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
335
{
336
    int i;
337
    for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
338
        if (!ff_guidcmp(guids[i].guid, guid))
339
            return guids[i].id;
340
    }
341
    return CODEC_ID_NONE;
342
}
343

    
344
/* WTV GUIDs */
345
static const ff_asf_guid wtv_guid =
346
    {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
347
static const ff_asf_guid metadata_guid =
348
    {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
349
static const ff_asf_guid timestamp_guid =
350
    {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
351
static const ff_asf_guid data_guid =
352
    {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
353
static const ff_asf_guid stream_guid =
354
    {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
355
static const ff_asf_guid stream2_guid =
356
    {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
357
static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
358
    {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
359
static const ff_asf_guid EVENTID_LanguageSpanningEvent =
360
    {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
361
static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
362
    {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
363
static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
364
    {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
365
static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
366
    {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
367
static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
368
    {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
369
static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
370
    {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
371
static const ff_asf_guid EVENTID_TeletextSpanningEvent =
372
    {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
373

    
374
/* Windows media GUIDs */
375

    
376
#define MEDIASUBTYPE_BASE_GUID \
377
    0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
378

    
379
/* Media types */
380
static const ff_asf_guid mediatype_audio =
381
    {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
382
static const ff_asf_guid mediatype_video =
383
    {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
384
static const ff_asf_guid mediasubtype_mpeg1payload =
385
    {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
386
static const ff_asf_guid mediatype_mpeg2_sections =
387
    {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
388
static const ff_asf_guid mediatype_mpeg2_pes =
389
    {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
390
static const ff_asf_guid mediatype_mstvcaption =
391
    {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
392

    
393
/* Media subtypes */
394
static const ff_asf_guid mediasubtype_cpfilters_processed =
395
    {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
396
static const ff_asf_guid mediasubtype_dvb_subtitle =
397
    {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
398
static const ff_asf_guid mediasubtype_teletext =
399
    {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
400
static const ff_asf_guid mediasubtype_dtvccdata =
401
    {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
402
static const ff_asf_guid mediasubtype_mpeg2_sections =
403
    {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
404

    
405
/* Formats */
406
static const ff_asf_guid format_cpfilters_processed =
407
    {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
408
static const ff_asf_guid format_waveformatex =
409
    {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
410
static const ff_asf_guid format_videoinfo2 =
411
    {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
412
static const ff_asf_guid format_mpeg2_video =
413
    {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
414
static const ff_asf_guid format_none =
415
    {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
416

    
417
static const AVCodecGuid video_guids[] = {
418
    {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
419
    {CODEC_ID_NONE}
420
};
421

    
422
static const AVCodecGuid audio_guids[] = {
423
    {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
424
    {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
425
    {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
426
    {CODEC_ID_NONE}
427
};
428

    
429
static int read_probe(AVProbeData *p)
430
{
431
    return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
432
}
433

    
434
/**
435
 * Convert win32 FILETIME to ISO-8601 string
436
 */
437
static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
438
{
439
    time_t t = (value / 10000000LL) - 11644473600LL;
440
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
441
}
442

    
443
/**
444
 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
445
 */
446
static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
447
{
448
    time_t t = (value / 10000000LL) - 719162LL*86400LL;
449
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
450
}
451

    
452
/**
453
 * Convert OLE DATE to ISO-8601 string
454
 */
455
static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
456
{
457
    time_t t = 631112400LL + 86400*av_int2dbl(value);
458
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
459
}
460

    
461
static void get_attachment(AVFormatContext *s, ByteIOContext *pb, int length)
462
{
463
    char mime[1024];
464
    char description[1024];
465
    unsigned int filesize;
466
    AVStream *st;
467
    int64_t pos = url_ftell(pb);
468

    
469
    avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
470
    if (strcmp(mime, "image/jpeg"))
471
        goto done;
472

    
473
    get_byte(pb);
474
    avio_get_str16le(pb, INT_MAX, description, sizeof(description));
475
    filesize = get_le32(pb);
476
    if (!filesize)
477
        goto done;
478

    
479
    st = av_new_stream(s, 0);
480
    if (!st)
481
        goto done;
482
    av_metadata_set2(&st->metadata, "title", description, 0);
483
    st->codec->codec_id   = CODEC_ID_MJPEG;
484
    st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
485
    st->codec->extradata  = av_mallocz(filesize);
486
    if (!st->codec->extradata)
487
        goto done;
488
    st->codec->extradata_size = filesize;
489
    get_buffer(pb, st->codec->extradata, filesize);
490
done:
491
    url_fseek(pb, pos + length, SEEK_SET);
492
}
493

    
494
static void get_tag(AVFormatContext *s, ByteIOContext *pb, const char *key, int type, int length)
495
{
496
    int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
497
    char *buf = av_malloc(buf_size);
498
    if (!buf)
499
        return;
500

    
501
    if (type == 0 && length == 4) {
502
        snprintf(buf, buf_size, "%"PRIi32, get_le32(pb));
503
    } else if (type == 1) {
504
        avio_get_str16le(pb, length, buf, buf_size);
505
        if (!strlen(buf)) {
506
           av_free(buf);
507
           return;
508
        }
509
    } else if (type == 3 && length == 4) {
510
        strcpy(buf, get_le32(pb) ? "true" : "false");
511
    } else if (type == 4 && length == 8) {
512
        int64_t num = get_le64(pb);
513
        if (!strcmp(key, "WM/EncodingTime") ||
514
            !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
515
            filetime_to_iso8601(buf, buf_size, num);
516
        else if (!strcmp(key, "WM/WMRVEncodeTime") ||
517
                 !strcmp(key, "WM/WMRVEndTime"))
518
            crazytime_to_iso8601(buf, buf_size, num);
519
        else if (!strcmp(key, "WM/WMRVExpirationDate"))
520
            oledate_to_iso8601(buf, buf_size, num);
521
        else if (!strcmp(key, "WM/WMRVBitrate"))
522
            snprintf(buf, buf_size, "%f", av_int2dbl(num));
523
        else
524
            snprintf(buf, buf_size, "%"PRIi64, num);
525
    } else if (type == 5 && length == 2) {
526
        snprintf(buf, buf_size, "%"PRIi16, get_le16(pb));
527
    } else if (type == 6 && length == 16) {
528
        ff_asf_guid guid;
529
        get_buffer(pb, guid, 16);
530
        snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
531
    } else if (type == 2 && !strcmp(key, "WM/Picture")) {
532
        get_attachment(s, pb, length);
533
        av_freep(&buf);
534
        return;
535
    } else {
536
        av_freep(&buf);
537
        av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
538
        url_fskip(pb, length);
539
        return;
540
    }
541

    
542
    av_metadata_set2(&s->metadata, key, buf, 0);
543
    av_freep(&buf);
544
}
545

    
546
/**
547
 * Parse metadata entries
548
 */
549
static void parse_legacy_attrib(AVFormatContext *s, ByteIOContext *pb)
550
{
551
    ff_asf_guid guid;
552
    int length, type;
553
    while(!url_feof(pb)) {
554
        char key[1024];
555
        ff_get_guid(pb, &guid);
556
        type   = get_le32(pb);
557
        length = get_le32(pb);
558
        if (!length)
559
            break;
560
        if (ff_guidcmp(&guid, metadata_guid)) {
561
            av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
562
                   "remaining metadata entries ignored\n", ARG_GUID(guid));
563
            break;
564
        }
565
        avio_get_str16le(pb, INT_MAX, key, sizeof(key));
566
        get_tag(s, pb, key, type, length);
567
    }
568

    
569
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
570
}
571

    
572
/**
573
 * parse VIDEOINFOHEADER2 structure
574
 * @return bytes consumed
575
 */
576
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
577
{
578
    WtvContext *wtv = s->priv_data;
579
    ByteIOContext *pb = wtv->pb;
580

    
581
    url_fskip(pb, 72);  // picture aspect ratio is unreliable
582
    ff_get_bmp_header(pb, st);
583

    
584
    return 72 + 40;
585
}
586

    
587
/**
588
 * Parse MPEG1WAVEFORMATEX extradata structure
589
 */
590
static void parse_mpeg1waveformatex(AVStream *st)
591
{
592
    /* fwHeadLayer */
593
    switch (AV_RL16(st->codec->extradata)) {
594
    case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
595
    case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
596
    case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
597
    }
598

    
599
    st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
600

    
601
    /* dwHeadMode */
602
    switch (AV_RL16(st->codec->extradata + 6)) {
603
    case 1 : case 2 : case 4 : st->codec->channels = 2; break;
604
    case 8 :                   st->codec->channels = 1; break;
605
    }
606
}
607

    
608
/**
609
 * Initialise stream
610
 * @param st Stream to initialise, or NULL to create and initialise new stream
611
 * @return NULL on error
612
 */
613
static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
614
{
615
    if (st) {
616
        if (st->codec->extradata) {
617
            av_freep(&st->codec->extradata);
618
            st->codec->extradata_size = 0;
619
        }
620
    } else {
621
        WtvStream *wst = av_mallocz(sizeof(WtvStream));
622
        if (!wst)
623
            return NULL;
624
        st = av_new_stream(s, sid);
625
        if (!st)
626
            return NULL;
627
        st->priv_data = wst;
628
    }
629
    st->codec->codec_type = codec_type;
630
    st->need_parsing      = AVSTREAM_PARSE_FULL;
631
    av_set_pts_info(st, 64, 1, 10000000);
632
    return st;
633
}
634

    
635
/**
636
 * parse Media Type structure and populate stream
637
 * @param st         Stream, or NULL to create new stream
638
 * @param mediatype  Mediatype GUID
639
 * @param subtype    Subtype GUID
640
 * @param formattype Format GUID
641
 * @param size       Size of format buffer
642
 * @return NULL on error
643
 */
644
static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
645
                                   ff_asf_guid mediatype, ff_asf_guid subtype,
646
                                   ff_asf_guid formattype, int size)
647
{
648
    WtvContext *wtv = s->priv_data;
649
    ByteIOContext *pb = wtv->pb;
650
    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
651
        !ff_guidcmp(formattype, format_cpfilters_processed)) {
652
        ff_asf_guid actual_subtype;
653
        ff_asf_guid actual_formattype;
654

    
655
        if (size < 32) {
656
            av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
657
            url_fskip(pb, size);
658
            return NULL;
659
        }
660

    
661
        url_fskip(pb, size - 32);
662
        ff_get_guid(pb, &actual_subtype);
663
        ff_get_guid(pb, &actual_formattype);
664
        url_fseek(pb, -size, SEEK_CUR);
665

    
666
        st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
667
        url_fskip(pb, 32);
668
        return st;
669
    } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
670
        st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
671
        if (!st)
672
            return NULL;
673
        if (!ff_guidcmp(formattype, format_waveformatex)) {
674
            ff_get_wav_header(pb, st->codec, size);
675
        } else {
676
            if (ff_guidcmp(formattype, format_none))
677
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
678
            url_fskip(pb, size);
679
        }
680

    
681
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
682
            st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
683
        } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
684
            if (st->codec->extradata && st->codec->extradata_size >= 22)
685
                parse_mpeg1waveformatex(st);
686
            else
687
                av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
688
        } else {
689
            st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
690
            if (st->codec->codec_id == CODEC_ID_NONE)
691
                av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
692
        }
693
        return st;
694
    } else if (!ff_guidcmp(mediatype, mediatype_video)) {
695
        st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
696
        if (!st)
697
            return NULL;
698
        if (!ff_guidcmp(formattype, format_videoinfo2)) {
699
            int consumed = parse_videoinfoheader2(s, st);
700
            url_fskip(pb, FFMAX(size - consumed, 0));
701
        } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
702
            int consumed = parse_videoinfoheader2(s, st);
703
            url_fskip(pb, FFMAX(size - consumed, 0));
704
        } else {
705
            if (ff_guidcmp(formattype, format_none))
706
                av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
707
            url_fskip(pb, size);
708
        }
709

    
710
        if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
711
            st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
712
        } else {
713
            st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
714
        }
715
        if (st->codec->codec_id == CODEC_ID_NONE)
716
            av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
717
        return st;
718
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
719
               !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
720
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
721
        if (!st)
722
            return NULL;
723
        if (ff_guidcmp(formattype, format_none))
724
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
725
        url_fskip(pb, size);
726
        st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
727
        return st;
728
    } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
729
               (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
730
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
731
        if (!st)
732
            return NULL;
733
        if (ff_guidcmp(formattype, format_none))
734
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
735
        url_fskip(pb, size);
736
        st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
737
        return st;
738
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
739
               !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
740
        if (ff_guidcmp(formattype, format_none))
741
            av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
742
        url_fskip(pb, size);
743
        return NULL;
744
    }
745

    
746
    av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
747
                              ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
748
                              ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
749
    url_fskip(pb, size);
750
    return NULL;
751
}
752

    
753
enum {
754
    SEEK_TO_DATA = 0,
755
    SEEK_TO_PTS,
756
};
757

    
758
/**
759
 * Parse WTV chunks
760
 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
761
 * @param seekts timestamp
762
 * @param[out] len Length of data chunk
763
 * @return stream index of data chunk, or <0 on error
764
 */
765
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
766
{
767
    WtvContext *wtv = s->priv_data;
768
    ByteIOContext *pb = wtv->pb;
769
    while (!url_feof(pb)) {
770
        ff_asf_guid g;
771
        int len, sid, consumed;
772

    
773
        ff_get_guid(pb, &g);
774
        len = get_le32(pb);
775
        if (len < 32)
776
            break;
777
        sid = get_le32(pb) & 0x7FFF;
778
        url_fskip(pb, 8);
779
        consumed = 32;
780

    
781
        if (!ff_guidcmp(g, stream_guid)) {
782
            if (ff_find_stream_index(s, sid) < 0) {
783
                ff_asf_guid mediatype, subtype, formattype;
784
                int size;
785
                consumed += 20;
786
                url_fskip(pb, 16);
787
                if (get_le32(pb)) {
788
                    url_fskip(pb, 8);
789
                    ff_get_guid(pb, &mediatype);
790
                    ff_get_guid(pb, &subtype);
791
                    url_fskip(pb, 12);
792
                    ff_get_guid(pb, &formattype);
793
                    size = get_le32(pb);
794
                    parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
795
                    consumed += 72 + size;
796
                }
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_DVBScramblingControlSpanningEvent)) {
839
            int stream_index = ff_find_stream_index(s, sid);
840
            if (stream_index >= 0) {
841
                url_fskip(pb, 12);
842
                if (get_le32(pb))
843
                    av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
844
                consumed += 16;
845
            }
846
        } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
847
            int stream_index = ff_find_stream_index(s, sid);
848
            if (stream_index >= 0) {
849
                AVStream *st = s->streams[stream_index];
850
                uint8_t language[4];
851
                url_fskip(pb, 12);
852
                get_buffer(pb, language, 3);
853
                if (language[0]) {
854
                    language[3] = 0;
855
                    av_metadata_set2(&st->metadata, "language", language, 0);
856
                }
857
                consumed += 15;
858
            }
859
        } else if (!ff_guidcmp(g, timestamp_guid)) {
860
            int stream_index = ff_find_stream_index(s, sid);
861
            if (stream_index >= 0) {
862
                url_fskip(pb, 8);
863
                wtv->pts = get_le64(pb);
864
                consumed += 16;
865
                if (wtv->pts == -1)
866
                    wtv->pts = AV_NOPTS_VALUE;
867
                else {
868
                    wtv->last_valid_pts = wtv->pts;
869
                    if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
870
                        wtv->epoch = wtv->pts;
871
                if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
872
#define WTV_PAD8(x) (((x) + 7) & ~7)
873
                    url_fskip(pb, WTV_PAD8(len) - consumed);
874
                    return 0;
875
                }
876
                }
877
            }
878
        } else if (!ff_guidcmp(g, data_guid)) {
879
            int stream_index = ff_find_stream_index(s, sid);
880
            if (mode == SEEK_TO_DATA && stream_index >= 0) {
881
                WtvStream *wst = s->streams[stream_index]->priv_data;
882
                wst->seen_data = 1;
883
                if (len_ptr) {
884
                    *len_ptr = len;
885
                }
886
                return stream_index;
887
            }
888
        } else if (
889
            !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}) ||
890
            !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}) ||
891
            !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}) ||
892
            !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}) ||
893
            !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}) ||
894
            !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}) ||
895
            !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}) ||
896
            !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}) ||
897
            !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}) ||
898
            !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}) ||
899
            !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}) ||
900
            !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
901
            !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
902
            !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
903
            !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
904
            !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
905
            !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
906
            !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
907
            !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
908
            //ignore known guids
909
        } else
910
            av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
911

    
912
        url_fskip(pb, WTV_PAD8(len) - consumed);
913
    }
914
    return AVERROR_EOF;
915
}
916

    
917
/* declare utf16le strings */
918
#define _ , 0,
919
static const uint8_t timeline_le16[] =
920
    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
921
static const uint8_t table_0_entries_legacy_attrib_le16[] =
922
    {'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};
923
static const uint8_t table_0_entries_time_le16[] =
924
    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
925
static const uint8_t timeline_table_0_entries_Events_le16[] =
926
    {'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};
927
#undef _
928

    
929
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
930
{
931
    WtvContext *wtv = s->priv_data;
932
    int root_sector, root_size;
933
    uint8_t root[WTV_SECTOR_SIZE];
934
    ByteIOContext *pb;
935
    int64_t timeline_pos;
936
    int ret;
937

    
938
    wtv->epoch          =
939
    wtv->pts            =
940
    wtv->last_valid_pts = AV_NOPTS_VALUE;
941

    
942
    /* read root directory sector */
943
    url_fskip(s->pb, 0x30);
944
    root_size = get_le32(s->pb);
945
    if (root_size > sizeof(root)) {
946
        av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
947
        return AVERROR_INVALIDDATA;
948
    }
949
    url_fskip(s->pb, 4);
950
    root_sector = get_le32(s->pb);
951

    
952
    url_fseek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
953
    root_size = get_buffer(s->pb, root, root_size);
954
    if (root_size < 0)
955
        return AVERROR_INVALIDDATA;
956

    
957
    /* parse chunks up until first data chunk */
958
    wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
959
    if (!wtv->pb) {
960
        av_log(s, AV_LOG_ERROR, "timeline data missing\n");
961
        return AVERROR_INVALIDDATA;
962
    }
963

    
964
    ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
965
    if (ret < 0)
966
        return ret;
967
    url_fseek(wtv->pb, -32, SEEK_CUR);
968

    
969
    timeline_pos = url_ftell(s->pb); // save before opening another file
970

    
971
    /* read metadata */
972
    pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
973
    if (pb) {
974
        parse_legacy_attrib(s, pb);
975
        wtvfile_close(pb);
976
    }
977

    
978
    /* read seek index */
979
    if (s->nb_streams) {
980
        AVStream *st = s->streams[0];
981
        pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
982
        if (pb) {
983
            while(1) {
984
                uint64_t timestamp = get_le64(pb);
985
                uint64_t frame_nb  = get_le64(pb);
986
                if (url_feof(pb))
987
                    break;
988
                ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
989
                                   0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
990
            }
991
            wtvfile_close(pb);
992

    
993
            if (wtv->nb_index_entries) {
994
                pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
995
                if (pb) {
996
                    int i;
997
                    while (1) {
998
                        uint64_t frame_nb = get_le64(pb);
999
                        uint64_t position = get_le64(pb);
1000
                        if (url_feof(pb))
1001
                            break;
1002
                        for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1003
                            AVIndexEntry *e = wtv->index_entries + i;
1004
                            if (frame_nb > e->size)
1005
                                break;
1006
                            if (position > e->pos)
1007
                                e->pos = position;
1008
                        }
1009
                    }
1010
                    wtvfile_close(pb);
1011
                    st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1012
                }
1013
            }
1014
        }
1015
    }
1016

    
1017
    url_fseek(s->pb, timeline_pos, SEEK_SET);
1018
    return 0;
1019
}
1020

    
1021
static int read_packet(AVFormatContext *s, AVPacket *pkt)
1022
{
1023
    WtvContext *wtv = s->priv_data;
1024
    ByteIOContext *pb = wtv->pb;
1025
    int stream_index, len, ret;
1026

    
1027
    stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1028
    if (stream_index < 0)
1029
        return stream_index;
1030

    
1031
    ret = av_get_packet(pb, pkt, len - 32);
1032
    if (ret < 0)
1033
        return ret;
1034
    pkt->stream_index = stream_index;
1035
    pkt->pts          = wtv->pts;
1036
    url_fskip(pb, WTV_PAD8(len) - len);
1037
    return 0;
1038
}
1039

    
1040
static int read_seek(AVFormatContext *s, int stream_index,
1041
                     int64_t ts, int flags)
1042
{
1043
    WtvContext *wtv = s->priv_data;
1044
    ByteIOContext *pb = wtv->pb;
1045
    AVStream *st = s->streams[0];
1046
    int64_t ts_relative;
1047
    int i;
1048

    
1049
    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1050
        return AVERROR_NOTSUPP;
1051

    
1052
    /* timestamp adjustment is required because wtv->pts values are absolute,
1053
     * whereas AVIndexEntry->timestamp values are relative to epoch. */
1054
    ts_relative = ts;
1055
    if (wtv->epoch != AV_NOPTS_VALUE)
1056
        ts_relative -= wtv->epoch;
1057

    
1058
    i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1059
    if (i < 0) {
1060
        if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1061
            url_fseek(pb, 0, SEEK_SET);
1062
        else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1063
            url_fseek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1064
        if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1065
            return AVERROR(ERANGE);
1066
        return 0;
1067
    }
1068
    wtv->pts = wtv->index_entries[i].timestamp;
1069
    if (wtv->epoch != AV_NOPTS_VALUE)
1070
        wtv->pts += wtv->epoch;
1071
    wtv->last_valid_pts = wtv->pts;
1072
    url_fseek(pb, wtv->index_entries[i].pos, SEEK_SET);
1073
    return 0;
1074
}
1075

    
1076
static int read_close(AVFormatContext *s)
1077
{
1078
    WtvContext *wtv = s->priv_data;
1079
    wtvfile_close(wtv->pb);
1080
    return 0;
1081
}
1082

    
1083
AVInputFormat ff_wtv_demuxer = {
1084
    .name           = "wtv",
1085
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1086
    .priv_data_size = sizeof(WtvContext),
1087
    .read_probe     = read_probe,
1088
    .read_header    = read_header,
1089
    .read_packet    = read_packet,
1090
    .read_seek      = read_seek,
1091
    .read_close     = read_close,
1092
    .flags          = AVFMT_SHOW_IDS,
1093
};