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1
/*
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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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 */
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 */
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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
43

    
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/*
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 *
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 * File system routines
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 *
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 */
49

    
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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
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typedef struct {
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    AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
56

    
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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 */
60

    
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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;
65

    
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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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    AVIOContext *pb = wf->pb_filesystem;
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    int nread = 0;
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    if (wf->error || pb->error)
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        return -1;
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    if (wf->position >= wf->length || url_feof(pb))
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        return 0;
79

    
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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);
85

    
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        n = avio_read(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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                avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
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                wf->error = 1;
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                break;
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            }
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        }
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    }
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    return nread;
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}
104

    
105
/**
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 * @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)
109
{
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    WtvFile *wf = opaque;
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    AVIOContext *pb = wf->pb_filesystem;
112

    
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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;
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    wf->error = offset < 0 || offset >= wf->length ||
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                avio_seek(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;
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}
126

    
127
/**
128
 * read non-zero integers (le32) from input stream
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 * @param pb
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 * @param[out] data destination
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 * @param     count maximum number of integers to read
132
 * @return    total number of integers read
133
 */
134
static int read_ints(AVIOContext *pb, uint32_t *data, int count)
135
{
136
    int i, total = 0;
137
    for (i = 0; i < count; i++) {
138
        if ((data[total] = avio_rl32(pb)))
139
           total++;
140
    }
141
    return total;
142
}
143

    
144
/**
145
 * Open file
146
 * @param first_sector  First sector
147
 * @param length        Length of file (bytes)
148
 * @param depth         File allocation table depth
149
 * @return NULL on error
150
 */
151
static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
152
{
153
    AVIOContext *pb;
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    WtvFile *wf;
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    uint8_t *buffer;
156

    
157
    if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
158
        return NULL;
159

    
160
    wf = av_mallocz(sizeof(WtvFile));
161
    if (!wf)
162
        return NULL;
163

    
164
    if (depth == 0) {
165
        wf->sectors = av_malloc(sizeof(uint32_t));
166
        if (!wf->sectors) {
167
            av_free(wf);
168
            return NULL;
169
        }
170
        wf->sectors[0]  = first_sector;
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        wf->nb_sectors  = 1;
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        wf->sector_bits = WTV_SECTOR_BITS;
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    } else if (depth == 1) {
174
        wf->sectors = av_malloc(WTV_SECTOR_SIZE);
175
        if (!wf->sectors) {
176
            av_free(wf);
177
            return NULL;
178
        }
179
        wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
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        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
181
    } else if (depth == 2) {
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        uint32_t sectors1[WTV_SECTOR_SIZE / 4];
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        int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
184
        int i;
185

    
186
        wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
187
        if (!wf->sectors) {
188
            av_free(wf);
189
            return NULL;
190
        }
191
        wf->nb_sectors = 0;
192
        for (i = 0; i < nb_sectors1; i++) {
193
            if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
194
                break;
195
            wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
196
        }
197
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
198
    } else {
199
        av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
200
        av_free(wf);
201
        return NULL;
202
    }
203

    
204
    if (!wf->nb_sectors) {
205
        av_free(wf->sectors);
206
        av_free(wf);
207
        return NULL;
208
    }
209

    
210
    /* check length */
211
    length &= 0xFFFFFFFFFFFF;
212
    if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
213
        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);
214
        length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
215
    }
216
    wf->length = length;
217

    
218
    /* seek to intial sector */
219
    wf->position = 0;
220
    if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
221
        av_free(wf->sectors);
222
        av_free(wf);
223
        return NULL;
224
    }
225

    
226
    wf->pb_filesystem = s->pb;
227
    buffer = av_malloc(1 << wf->sector_bits);
228
    if (!buffer) {
229
        av_free(wf->sectors);
230
        av_free(wf);
231
        return NULL;
232
    }
233

    
234
    pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
235
                           wtvfile_read_packet, NULL, wtvfile_seek);
236
    if (!pb) {
237
        av_free(buffer);
238
        av_free(wf->sectors);
239
        av_free(wf);
240
    }
241
    return pb;
242
}
243

    
244
static const ff_asf_guid dir_entry_guid =
245
    {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
246

    
247
/**
248
 * Open file using filename
249
 * @param[in]  buf       directory buffer
250
 * @param      buf_size  directory buffer size
251
 * @param[in]  filename
252
 * @param      filename_size size of filename
253
 * @return NULL on error
254
 */
255
static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
256
{
257
    const uint8_t *buf_end = buf + buf_size;
258

    
259
    while(buf + 48 <= buf_end) {
260
        int dir_length, name_size, first_sector, depth;
261
        uint64_t file_length;
262
        const uint8_t *name;
263
        if (ff_guidcmp(buf, dir_entry_guid)) {
264
            av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
265
                   "remaining directory entries ignored\n", FF_ARG_GUID(buf));
266
            break;
267
        }
268
        dir_length  = AV_RL16(buf + 16);
269
        file_length = AV_RL64(buf + 24);
270
        name_size   = 2 * AV_RL32(buf + 32);
271
        if (buf + 48 + name_size > buf_end) {
272
            av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
273
            break;
274
        }
275
        first_sector = AV_RL32(buf + 40 + name_size);
276
        depth        = AV_RL32(buf + 44 + name_size);
277

    
278
        /* compare file name; test optional null terminator */
279
        name = buf + 40;
280
        if (name_size >= filename_size &&
281
            !memcmp(name, filename, filename_size) &&
282
            (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
283
            return wtvfile_open_sector(first_sector, file_length, depth, s);
284

    
285
        buf += dir_length;
286
    }
287
    return 0;
288
}
289

    
290
#define wtvfile_open(s, buf, buf_size, filename) \
291
    wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
292

    
293
/**
294
 * Close file opened with wtvfile_open_sector(), or wtv_open()
295
 */
296
static void wtvfile_close(AVIOContext *pb)
297
{
298
    WtvFile *wf = pb->opaque;
299
    av_free(wf->sectors);
300
    av_free(pb);
301
}
302

    
303
/*
304
 *
305
 * Main demuxer
306
 *
307
 */
308

    
309
typedef struct {
310
    int seen_data;
311
} WtvStream;
312

    
313
typedef struct {
314
    AVIOContext *pb;       /** timeline file */
315
    int64_t epoch;
316
    int64_t pts;             /** pts for next data chunk */
317
    int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
318

    
319
    /* maintain private seek index, as the AVIndexEntry->pos is relative to the
320
       start of the 'timeline' file, not the file system (AVFormatContext->pb) */
321
    AVIndexEntry *index_entries;
322
    int nb_index_entries;
323
    unsigned int index_entries_allocated_size;
324
} WtvContext;
325

    
326
/* WTV GUIDs */
327
static const ff_asf_guid wtv_guid =
328
    {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
329
static const ff_asf_guid metadata_guid =
330
    {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
331
static const ff_asf_guid timestamp_guid =
332
    {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
333
static const ff_asf_guid data_guid =
334
    {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
335
static const ff_asf_guid stream_guid =
336
    {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
337
static const ff_asf_guid stream2_guid =
338
    {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
339
static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
340
    {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
341
static const ff_asf_guid EVENTID_LanguageSpanningEvent =
342
    {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
343
static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
344
    {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
345
static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
346
    {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
347
static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
348
    {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
349
static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
350
    {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
351
static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
352
    {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
353
static const ff_asf_guid EVENTID_TeletextSpanningEvent =
354
    {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
355
static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
356
    {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
357

    
358
/* Windows media GUIDs */
359

    
360
/* Media types */
361
static const ff_asf_guid mediatype_audio =
362
    {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
363
static const ff_asf_guid mediatype_video =
364
    {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
365
static const ff_asf_guid mediasubtype_mpeg1payload =
366
    {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
367
static const ff_asf_guid mediatype_mpeg2_sections =
368
    {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
369
static const ff_asf_guid mediatype_mpeg2_pes =
370
    {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
371
static const ff_asf_guid mediatype_mstvcaption =
372
    {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
373

    
374
/* Media subtypes */
375
static const ff_asf_guid mediasubtype_cpfilters_processed =
376
    {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
377
static const ff_asf_guid mediasubtype_dvb_subtitle =
378
    {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
379
static const ff_asf_guid mediasubtype_teletext =
380
    {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
381
static const ff_asf_guid mediasubtype_dtvccdata =
382
    {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
383
static const ff_asf_guid mediasubtype_mpeg2_sections =
384
    {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
385

    
386
/* Formats */
387
static const ff_asf_guid format_cpfilters_processed =
388
    {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
389
static const ff_asf_guid format_waveformatex =
390
    {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
391
static const ff_asf_guid format_videoinfo2 =
392
    {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
393
static const ff_asf_guid format_mpeg2_video =
394
    {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
395
static const ff_asf_guid format_none =
396
    {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
397

    
398
static const AVCodecGuid video_guids[] = {
399
    {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
400
    {CODEC_ID_NONE}
401
};
402

    
403
static int read_probe(AVProbeData *p)
404
{
405
    return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
406
}
407

    
408
/**
409
 * Convert win32 FILETIME to ISO-8601 string
410
 */
411
static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
412
{
413
    time_t t = (value / 10000000LL) - 11644473600LL;
414
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
415
}
416

    
417
/**
418
 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
419
 */
420
static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
421
{
422
    time_t t = (value / 10000000LL) - 719162LL*86400LL;
423
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
424
}
425

    
426
/**
427
 * Convert OLE DATE to ISO-8601 string
428
 */
429
static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
430
{
431
    time_t t = 631112400LL + 86400*av_int2dbl(value);
432
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
433
}
434

    
435
static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
436
{
437
    char mime[1024];
438
    char description[1024];
439
    unsigned int filesize;
440
    AVStream *st;
441
    int64_t pos = avio_tell(pb);
442

    
443
    avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
444
    if (strcmp(mime, "image/jpeg"))
445
        goto done;
446

    
447
    avio_r8(pb);
448
    avio_get_str16le(pb, INT_MAX, description, sizeof(description));
449
    filesize = avio_rl32(pb);
450
    if (!filesize)
451
        goto done;
452

    
453
    st = av_new_stream(s, 0);
454
    if (!st)
455
        goto done;
456
    av_metadata_set2(&st->metadata, "title", description, 0);
457
    st->codec->codec_id   = CODEC_ID_MJPEG;
458
    st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
459
    st->codec->extradata  = av_mallocz(filesize);
460
    if (!st->codec->extradata)
461
        goto done;
462
    st->codec->extradata_size = filesize;
463
    avio_read(pb, st->codec->extradata, filesize);
464
done:
465
    avio_seek(pb, pos + length, SEEK_SET);
466
}
467

    
468
static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
469
{
470
    int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
471
    char *buf = av_malloc(buf_size);
472
    if (!buf)
473
        return;
474

    
475
    if (type == 0 && length == 4) {
476
        snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
477
    } else if (type == 1) {
478
        avio_get_str16le(pb, length, buf, buf_size);
479
        if (!strlen(buf)) {
480
           av_free(buf);
481
           return;
482
        }
483
    } else if (type == 3 && length == 4) {
484
        strcpy(buf, avio_rl32(pb) ? "true" : "false");
485
    } else if (type == 4 && length == 8) {
486
        int64_t num = avio_rl64(pb);
487
        if (!strcmp(key, "WM/EncodingTime") ||
488
            !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
489
            filetime_to_iso8601(buf, buf_size, num);
490
        else if (!strcmp(key, "WM/WMRVEncodeTime") ||
491
                 !strcmp(key, "WM/WMRVEndTime"))
492
            crazytime_to_iso8601(buf, buf_size, num);
493
        else if (!strcmp(key, "WM/WMRVExpirationDate"))
494
            oledate_to_iso8601(buf, buf_size, num);
495
        else if (!strcmp(key, "WM/WMRVBitrate"))
496
            snprintf(buf, buf_size, "%f", av_int2dbl(num));
497
        else
498
            snprintf(buf, buf_size, "%"PRIi64, num);
499
    } else if (type == 5 && length == 2) {
500
        snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
501
    } else if (type == 6 && length == 16) {
502
        ff_asf_guid guid;
503
        avio_read(pb, guid, 16);
504
        snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
505
    } else if (type == 2 && !strcmp(key, "WM/Picture")) {
506
        get_attachment(s, pb, length);
507
        av_freep(&buf);
508
        return;
509
    } else {
510
        av_freep(&buf);
511
        av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
512
        avio_skip(pb, length);
513
        return;
514
    }
515

    
516
    av_metadata_set2(&s->metadata, key, buf, 0);
517
    av_freep(&buf);
518
}
519

    
520
/**
521
 * Parse metadata entries
522
 */
523
static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
524
{
525
    ff_asf_guid guid;
526
    int length, type;
527
    while(!url_feof(pb)) {
528
        char key[1024];
529
        ff_get_guid(pb, &guid);
530
        type   = avio_rl32(pb);
531
        length = avio_rl32(pb);
532
        if (!length)
533
            break;
534
        if (ff_guidcmp(&guid, metadata_guid)) {
535
            av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
536
                   "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
537
            break;
538
        }
539
        avio_get_str16le(pb, INT_MAX, key, sizeof(key));
540
        get_tag(s, pb, key, type, length);
541
    }
542

    
543
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
544
}
545

    
546
/**
547
 * parse VIDEOINFOHEADER2 structure
548
 * @return bytes consumed
549
 */
550
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
551
{
552
    WtvContext *wtv = s->priv_data;
553
    AVIOContext *pb = wtv->pb;
554

    
555
    avio_skip(pb, 72);  // picture aspect ratio is unreliable
556
    ff_get_bmp_header(pb, st);
557

    
558
    return 72 + 40;
559
}
560

    
561
/**
562
 * Parse MPEG1WAVEFORMATEX extradata structure
563
 */
564
static void parse_mpeg1waveformatex(AVStream *st)
565
{
566
    /* fwHeadLayer */
567
    switch (AV_RL16(st->codec->extradata)) {
568
    case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
569
    case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
570
    case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
571
    }
572

    
573
    st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
574

    
575
    /* dwHeadMode */
576
    switch (AV_RL16(st->codec->extradata + 6)) {
577
    case 1 : case 2 : case 4 : st->codec->channels = 2; break;
578
    case 8 :                   st->codec->channels = 1; break;
579
    }
580
}
581

    
582
/**
583
 * Initialise stream
584
 * @param st Stream to initialise, or NULL to create and initialise new stream
585
 * @return NULL on error
586
 */
587
static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
588
{
589
    if (st) {
590
        if (st->codec->extradata) {
591
            av_freep(&st->codec->extradata);
592
            st->codec->extradata_size = 0;
593
        }
594
    } else {
595
        WtvStream *wst = av_mallocz(sizeof(WtvStream));
596
        if (!wst)
597
            return NULL;
598
        st = av_new_stream(s, sid);
599
        if (!st)
600
            return NULL;
601
        st->priv_data = wst;
602
    }
603
    st->codec->codec_type = codec_type;
604
    st->need_parsing      = AVSTREAM_PARSE_FULL;
605
    av_set_pts_info(st, 64, 1, 10000000);
606
    return st;
607
}
608

    
609
/**
610
 * parse Media Type structure and populate stream
611
 * @param st         Stream, or NULL to create new stream
612
 * @param mediatype  Mediatype GUID
613
 * @param subtype    Subtype GUID
614
 * @param formattype Format GUID
615
 * @param size       Size of format buffer
616
 * @return NULL on error
617
 */
618
static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
619
                                   ff_asf_guid mediatype, ff_asf_guid subtype,
620
                                   ff_asf_guid formattype, int size)
621
{
622
    WtvContext *wtv = s->priv_data;
623
    AVIOContext *pb = wtv->pb;
624
    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
625
        !ff_guidcmp(formattype, format_cpfilters_processed)) {
626
        ff_asf_guid actual_subtype;
627
        ff_asf_guid actual_formattype;
628

    
629
        if (size < 32) {
630
            av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
631
            avio_skip(pb, size);
632
            return NULL;
633
        }
634

    
635
        avio_skip(pb, size - 32);
636
        ff_get_guid(pb, &actual_subtype);
637
        ff_get_guid(pb, &actual_formattype);
638
        avio_seek(pb, -size, SEEK_CUR);
639

    
640
        st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
641
        avio_skip(pb, 32);
642
        return st;
643
    } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
644
        st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
645
        if (!st)
646
            return NULL;
647
        if (!ff_guidcmp(formattype, format_waveformatex)) {
648
            ff_get_wav_header(pb, st->codec, size);
649
        } else {
650
            if (ff_guidcmp(formattype, format_none))
651
                av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
652
            avio_skip(pb, size);
653
        }
654

    
655
        if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
656
            st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
657
        } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
658
            if (st->codec->extradata && st->codec->extradata_size >= 22)
659
                parse_mpeg1waveformatex(st);
660
            else
661
                av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
662
        } else {
663
            st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
664
            if (st->codec->codec_id == CODEC_ID_NONE)
665
                av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
666
        }
667
        return st;
668
    } else if (!ff_guidcmp(mediatype, mediatype_video)) {
669
        st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
670
        if (!st)
671
            return NULL;
672
        if (!ff_guidcmp(formattype, format_videoinfo2)) {
673
            int consumed = parse_videoinfoheader2(s, st);
674
            avio_skip(pb, FFMAX(size - consumed, 0));
675
        } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
676
            int consumed = parse_videoinfoheader2(s, st);
677
            avio_skip(pb, FFMAX(size - consumed, 0));
678
        } else {
679
            if (ff_guidcmp(formattype, format_none))
680
                av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
681
            avio_skip(pb, size);
682
        }
683

    
684
        if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
685
            st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
686
        } else {
687
            st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
688
        }
689
        if (st->codec->codec_id == CODEC_ID_NONE)
690
            av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
691
        return st;
692
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
693
               !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
694
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
695
        if (!st)
696
            return NULL;
697
        if (ff_guidcmp(formattype, format_none))
698
            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
699
        avio_skip(pb, size);
700
        st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
701
        return st;
702
    } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
703
               (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
704
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
705
        if (!st)
706
            return NULL;
707
        if (ff_guidcmp(formattype, format_none))
708
            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
709
        avio_skip(pb, size);
710
        st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
711
        return st;
712
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
713
               !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
714
        if (ff_guidcmp(formattype, format_none))
715
            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
716
        avio_skip(pb, size);
717
        return NULL;
718
    }
719

    
720
    av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
721
                              ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
722
                              FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
723
    avio_skip(pb, size);
724
    return NULL;
725
}
726

    
727
enum {
728
    SEEK_TO_DATA = 0,
729
    SEEK_TO_PTS,
730
};
731

    
732
/**
733
 * Parse WTV chunks
734
 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
735
 * @param seekts timestamp
736
 * @param[out] len Length of data chunk
737
 * @return stream index of data chunk, or <0 on error
738
 */
739
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
740
{
741
    WtvContext *wtv = s->priv_data;
742
    AVIOContext *pb = wtv->pb;
743
    while (!url_feof(pb)) {
744
        ff_asf_guid g;
745
        int len, sid, consumed;
746

    
747
        ff_get_guid(pb, &g);
748
        len = avio_rl32(pb);
749
        if (len < 32)
750
            break;
751
        sid = avio_rl32(pb) & 0x7FFF;
752
        avio_skip(pb, 8);
753
        consumed = 32;
754

    
755
        if (!ff_guidcmp(g, stream_guid)) {
756
            if (ff_find_stream_index(s, sid) < 0) {
757
                ff_asf_guid mediatype, subtype, formattype;
758
                int size;
759
                avio_skip(pb, 28);
760
                ff_get_guid(pb, &mediatype);
761
                ff_get_guid(pb, &subtype);
762
                avio_skip(pb, 12);
763
                ff_get_guid(pb, &formattype);
764
                size = avio_rl32(pb);
765
                parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
766
                consumed += 92 + size;
767
            }
768
        } else if (!ff_guidcmp(g, stream2_guid)) {
769
            int stream_index = ff_find_stream_index(s, sid);
770
            if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
771
                ff_asf_guid mediatype, subtype, formattype;
772
                int size;
773
                avio_skip(pb, 12);
774
                ff_get_guid(pb, &mediatype);
775
                ff_get_guid(pb, &subtype);
776
                avio_skip(pb, 12);
777
                ff_get_guid(pb, &formattype);
778
                size = avio_rl32(pb);
779
                parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
780
                consumed += 76 + size;
781
            }
782
        } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
783
                   !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
784
                   !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
785
                   !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
786
                   !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
787
                   !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
788
            int stream_index = ff_find_stream_index(s, sid);
789
            if (stream_index >= 0) {
790
                AVStream *st = s->streams[stream_index];
791
                uint8_t buf[258];
792
                const uint8_t *pbuf = buf;
793
                int buf_size;
794

    
795
                avio_skip(pb, 8);
796
                consumed += 8;
797
                if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
798
                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
799
                    avio_skip(pb, 6);
800
                    consumed += 6;
801
                }
802

    
803
                buf_size = FFMIN(len - consumed, sizeof(buf));
804
                avio_read(pb, buf, buf_size);
805
                consumed += buf_size;
806
                ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
807
            }
808
        } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
809
            int stream_index = ff_find_stream_index(s, sid);
810
            if (stream_index >= 0) {
811
                AVStream *st = s->streams[stream_index];
812
                int audio_type;
813
                avio_skip(pb, 8);
814
                audio_type = avio_r8(pb);
815
                if (audio_type == 2)
816
                    st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
817
                else if (audio_type == 3)
818
                    st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
819
                consumed += 9;
820
            }
821
        } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
822
            int stream_index = ff_find_stream_index(s, sid);
823
            if (stream_index >= 0) {
824
                avio_skip(pb, 12);
825
                if (avio_rl32(pb))
826
                    av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
827
                consumed += 16;
828
            }
829
        } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
830
            int stream_index = ff_find_stream_index(s, sid);
831
            if (stream_index >= 0) {
832
                AVStream *st = s->streams[stream_index];
833
                uint8_t language[4];
834
                avio_skip(pb, 12);
835
                avio_read(pb, language, 3);
836
                if (language[0]) {
837
                    language[3] = 0;
838
                    av_metadata_set2(&st->metadata, "language", language, 0);
839
                    if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
840
                        st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
841
                }
842
                consumed += 15;
843
            }
844
        } else if (!ff_guidcmp(g, timestamp_guid)) {
845
            int stream_index = ff_find_stream_index(s, sid);
846
            if (stream_index >= 0) {
847
                avio_skip(pb, 8);
848
                wtv->pts = avio_rl64(pb);
849
                consumed += 16;
850
                if (wtv->pts == -1)
851
                    wtv->pts = AV_NOPTS_VALUE;
852
                else {
853
                    wtv->last_valid_pts = wtv->pts;
854
                    if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
855
                        wtv->epoch = wtv->pts;
856
                if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
857
#define WTV_PAD8(x) (((x) + 7) & ~7)
858
                    avio_skip(pb, WTV_PAD8(len) - consumed);
859
                    return 0;
860
                }
861
                }
862
            }
863
        } else if (!ff_guidcmp(g, data_guid)) {
864
            int stream_index = ff_find_stream_index(s, sid);
865
            if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
866
                WtvStream *wst = s->streams[stream_index]->priv_data;
867
                wst->seen_data = 1;
868
                if (len_ptr) {
869
                    *len_ptr = len;
870
                }
871
                return stream_index;
872
            }
873
        } else if (
874
            !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}) ||
875
            !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}) ||
876
            !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}) ||
877
            !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}) ||
878
            !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}) ||
879
            !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}) ||
880
            !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}) ||
881
            !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}) ||
882
            !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}) ||
883
            !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}) ||
884
            !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
885
            !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
886
            !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
887
            !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
888
            !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
889
            !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
890
            !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
891
            !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
892
            //ignore known guids
893
        } else
894
            av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
895

    
896
        avio_skip(pb, WTV_PAD8(len) - consumed);
897
    }
898
    return AVERROR_EOF;
899
}
900

    
901
/* declare utf16le strings */
902
#define _ , 0,
903
static const uint8_t timeline_le16[] =
904
    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
905
static const uint8_t table_0_entries_legacy_attrib_le16[] =
906
    {'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};
907
static const uint8_t table_0_entries_time_le16[] =
908
    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
909
static const uint8_t timeline_table_0_entries_Events_le16[] =
910
    {'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};
911
#undef _
912

    
913
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
914
{
915
    WtvContext *wtv = s->priv_data;
916
    int root_sector, root_size;
917
    uint8_t root[WTV_SECTOR_SIZE];
918
    AVIOContext *pb;
919
    int64_t timeline_pos;
920
    int ret;
921

    
922
    wtv->epoch          =
923
    wtv->pts            =
924
    wtv->last_valid_pts = AV_NOPTS_VALUE;
925

    
926
    /* read root directory sector */
927
    avio_skip(s->pb, 0x30);
928
    root_size = avio_rl32(s->pb);
929
    if (root_size > sizeof(root)) {
930
        av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
931
        return AVERROR_INVALIDDATA;
932
    }
933
    avio_skip(s->pb, 4);
934
    root_sector = avio_rl32(s->pb);
935

    
936
    avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
937
    root_size = avio_read(s->pb, root, root_size);
938
    if (root_size < 0)
939
        return AVERROR_INVALIDDATA;
940

    
941
    /* parse chunks up until first data chunk */
942
    wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
943
    if (!wtv->pb) {
944
        av_log(s, AV_LOG_ERROR, "timeline data missing\n");
945
        return AVERROR_INVALIDDATA;
946
    }
947

    
948
    ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
949
    if (ret < 0)
950
        return ret;
951
    avio_seek(wtv->pb, -32, SEEK_CUR);
952

    
953
    timeline_pos = avio_tell(s->pb); // save before opening another file
954

    
955
    /* read metadata */
956
    pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
957
    if (pb) {
958
        parse_legacy_attrib(s, pb);
959
        wtvfile_close(pb);
960
    }
961

    
962
    /* read seek index */
963
    if (s->nb_streams) {
964
        AVStream *st = s->streams[0];
965
        pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
966
        if (pb) {
967
            while(1) {
968
                uint64_t timestamp = avio_rl64(pb);
969
                uint64_t frame_nb  = avio_rl64(pb);
970
                if (url_feof(pb))
971
                    break;
972
                ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
973
                                   0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
974
            }
975
            wtvfile_close(pb);
976

    
977
            if (wtv->nb_index_entries) {
978
                pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
979
                if (pb) {
980
                    int i;
981
                    while (1) {
982
                        uint64_t frame_nb = avio_rl64(pb);
983
                        uint64_t position = avio_rl64(pb);
984
                        if (url_feof(pb))
985
                            break;
986
                        for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
987
                            AVIndexEntry *e = wtv->index_entries + i;
988
                            if (frame_nb > e->size)
989
                                break;
990
                            if (position > e->pos)
991
                                e->pos = position;
992
                        }
993
                    }
994
                    wtvfile_close(pb);
995
                    st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
996
                }
997
            }
998
        }
999
    }
1000

    
1001
    avio_seek(s->pb, timeline_pos, SEEK_SET);
1002
    return 0;
1003
}
1004

    
1005
static int read_packet(AVFormatContext *s, AVPacket *pkt)
1006
{
1007
    WtvContext *wtv = s->priv_data;
1008
    AVIOContext *pb = wtv->pb;
1009
    int stream_index, len, ret;
1010

    
1011
    stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1012
    if (stream_index < 0)
1013
        return stream_index;
1014

    
1015
    ret = av_get_packet(pb, pkt, len - 32);
1016
    if (ret < 0)
1017
        return ret;
1018
    pkt->stream_index = stream_index;
1019
    pkt->pts          = wtv->pts;
1020
    avio_skip(pb, WTV_PAD8(len) - len);
1021
    return 0;
1022
}
1023

    
1024
static int read_seek(AVFormatContext *s, int stream_index,
1025
                     int64_t ts, int flags)
1026
{
1027
    WtvContext *wtv = s->priv_data;
1028
    AVIOContext *pb = wtv->pb;
1029
    AVStream *st = s->streams[0];
1030
    int64_t ts_relative;
1031
    int i;
1032

    
1033
    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1034
        return AVERROR(ENOSYS);
1035

    
1036
    /* timestamp adjustment is required because wtv->pts values are absolute,
1037
     * whereas AVIndexEntry->timestamp values are relative to epoch. */
1038
    ts_relative = ts;
1039
    if (wtv->epoch != AV_NOPTS_VALUE)
1040
        ts_relative -= wtv->epoch;
1041

    
1042
    i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1043
    if (i < 0) {
1044
        if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1045
            avio_seek(pb, 0, SEEK_SET);
1046
        else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1047
            avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1048
        if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1049
            return AVERROR(ERANGE);
1050
        return 0;
1051
    }
1052
    wtv->pts = wtv->index_entries[i].timestamp;
1053
    if (wtv->epoch != AV_NOPTS_VALUE)
1054
        wtv->pts += wtv->epoch;
1055
    wtv->last_valid_pts = wtv->pts;
1056
    avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1057
    return 0;
1058
}
1059

    
1060
static int read_close(AVFormatContext *s)
1061
{
1062
    WtvContext *wtv = s->priv_data;
1063
    wtvfile_close(wtv->pb);
1064
    return 0;
1065
}
1066

    
1067
AVInputFormat ff_wtv_demuxer = {
1068
    .name           = "wtv",
1069
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1070
    .priv_data_size = sizeof(WtvContext),
1071
    .read_probe     = read_probe,
1072
    .read_header    = read_header,
1073
    .read_packet    = read_packet,
1074
    .read_seek      = read_seek,
1075
    .read_close     = read_close,
1076
    .flags          = AVFMT_SHOW_IDS,
1077
};