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ffmpeg / libavformat / asfdec.c @ 91d19d47

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1
/*
2
 * ASF compatible demuxer
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * 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

    
22
//#define DEBUG
23

    
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#include "libavutil/common.h"
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#include "libavutil/avstring.h"
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#include "libavcodec/mpegaudio.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 "asfcrypt.h"
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#include "avlanguage.h"
32

    
33
void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
34

    
35
#undef NDEBUG
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#include <assert.h>
37

    
38
#define FRAME_HEADER_SIZE 17
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// Fix Me! FRAME_HEADER_SIZE may be different.
40

    
41
static const ff_asf_guid index_guid = {
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    0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
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};
44

    
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static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
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    0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
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};
48
/**********************************/
49
/* decoding */
50

    
51
static int guidcmp(const void *g1, const void *g2)
52
{
53
    return memcmp(g1, g2, sizeof(ff_asf_guid));
54
}
55

    
56
#ifdef DEBUG
57
#define PRINT_IF_GUID(g,cmp) \
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if (!guidcmp(g, &cmp)) \
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    dprintf(NULL, "(GUID: %s) ", #cmp)
60

    
61
static void print_guid(const ff_asf_guid *g)
62
{
63
    int i;
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    PRINT_IF_GUID(g, ff_asf_header);
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    else PRINT_IF_GUID(g, ff_asf_file_header);
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    else PRINT_IF_GUID(g, ff_asf_stream_header);
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    else PRINT_IF_GUID(g, ff_asf_audio_stream);
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    else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
69
    else PRINT_IF_GUID(g, ff_asf_video_stream);
70
    else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
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    else PRINT_IF_GUID(g, ff_asf_command_stream);
72
    else PRINT_IF_GUID(g, ff_asf_comment_header);
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    else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
74
    else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
75
    else PRINT_IF_GUID(g, ff_asf_data_header);
76
    else PRINT_IF_GUID(g, index_guid);
77
    else PRINT_IF_GUID(g, ff_asf_head1_guid);
78
    else PRINT_IF_GUID(g, ff_asf_head2_guid);
79
    else PRINT_IF_GUID(g, ff_asf_my_guid);
80
    else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
81
    else PRINT_IF_GUID(g, ff_asf_extended_content_header);
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    else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
83
    else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
84
    else PRINT_IF_GUID(g, ff_asf_metadata_header);
85
    else PRINT_IF_GUID(g, stream_bitrate_guid);
86
    else PRINT_IF_GUID(g, ff_asf_language_guid);
87
    else
88
        dprintf(NULL, "(GUID: unknown) ");
89
    for(i=0;i<16;i++)
90
        dprintf(NULL, " 0x%02x,", (*g)[i]);
91
    dprintf(NULL, "}\n");
92
}
93
#undef PRINT_IF_GUID
94
#else
95
#define print_guid(g)
96
#endif
97

    
98
static void get_guid(ByteIOContext *s, ff_asf_guid *g)
99
{
100
    assert(sizeof(*g) == 16);
101
    get_buffer(s, *g, sizeof(*g));
102
}
103

    
104
#if 0
105
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
106
{
107
    int len, c;
108
    char *q;
109

110
    len = get_le16(pb);
111
    q = buf;
112
    while (len > 0) {
113
        c = get_le16(pb);
114
        if ((q - buf) < buf_size - 1)
115
            *q++ = c;
116
        len--;
117
    }
118
    *q = '\0';
119
}
120
#endif
121

    
122
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
123
{
124
    char* q = buf;
125
    for (; len > 1; len -= 2) {
126
        uint8_t tmp;
127
        PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
128
    }
129
    if (len > 0)
130
        url_fskip(pb, len);
131
    *q = '\0';
132
}
133

    
134
static int asf_probe(AVProbeData *pd)
135
{
136
    /* check file header */
137
    if (!guidcmp(pd->buf, &ff_asf_header))
138
        return AVPROBE_SCORE_MAX;
139
    else
140
        return 0;
141
}
142

    
143
static int get_value(ByteIOContext *pb, int type){
144
    switch(type){
145
        case 2: return get_le32(pb);
146
        case 3: return get_le32(pb);
147
        case 4: return get_le64(pb);
148
        case 5: return get_le16(pb);
149
        default:return INT_MIN;
150
    }
151
}
152

    
153
static void get_tag(AVFormatContext *s, const char *key, int type, int len)
154
{
155
    char value[1024];
156
    if (type <= 1) {         // unicode or byte
157
        get_str16_nolen(s->pb, len, value, sizeof(value));
158
    } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
159
        uint64_t num = get_value(s->pb, type);
160
        snprintf(value, sizeof(value), "%"PRIu64, num);
161
    } else {
162
        url_fskip(s->pb, len);
163
        return;
164
    }
165
    if (!strncmp(key, "WM/", 3))
166
        key += 3;
167
    av_metadata_set(&s->metadata, key, value);
168
}
169

    
170
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
171
{
172
    ASFContext *asf = s->priv_data;
173
    ff_asf_guid g;
174
    ByteIOContext *pb = s->pb;
175
    AVStream *st;
176
    ASFStream *asf_st;
177
    int size, i;
178
    int64_t gsize;
179
    AVRational dar[128];
180
    uint32_t bitrate[128];
181

    
182
    memset(dar, 0, sizeof(dar));
183
    memset(bitrate, 0, sizeof(bitrate));
184

    
185
    get_guid(pb, &g);
186
    if (guidcmp(&g, &ff_asf_header))
187
        return -1;
188
    get_le64(pb);
189
    get_le32(pb);
190
    get_byte(pb);
191
    get_byte(pb);
192
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
193
    for(;;) {
194
        get_guid(pb, &g);
195
        gsize = get_le64(pb);
196
        dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
197
        print_guid(&g);
198
        dprintf(s, "  size=0x%"PRIx64"\n", gsize);
199
        if (!guidcmp(&g, &ff_asf_data_header)) {
200
            asf->data_object_offset = url_ftell(pb);
201
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
202
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
203
                asf->data_object_size = gsize - 24;
204
            } else {
205
                asf->data_object_size = (uint64_t)-1;
206
            }
207
            break;
208
        }
209
        if (gsize < 24)
210
            return -1;
211
        if (!guidcmp(&g, &ff_asf_file_header)) {
212
            get_guid(pb, &asf->hdr.guid);
213
            asf->hdr.file_size          = get_le64(pb);
214
            asf->hdr.create_time        = get_le64(pb);
215
            asf->nb_packets             = get_le64(pb);
216
            asf->hdr.play_time          = get_le64(pb);
217
            asf->hdr.send_time          = get_le64(pb);
218
            asf->hdr.preroll            = get_le32(pb);
219
            asf->hdr.ignore             = get_le32(pb);
220
            asf->hdr.flags              = get_le32(pb);
221
            asf->hdr.min_pktsize        = get_le32(pb);
222
            asf->hdr.max_pktsize        = get_le32(pb);
223
            asf->hdr.max_bitrate        = get_le32(pb);
224
            s->packet_size = asf->hdr.max_pktsize;
225
        } else if (!guidcmp(&g, &ff_asf_stream_header)) {
226
            enum CodecType type;
227
            int type_specific_size, sizeX;
228
            uint64_t total_size;
229
            unsigned int tag1;
230
            int64_t pos1, pos2, start_time;
231
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
232

    
233
            pos1 = url_ftell(pb);
234

    
235
            st = av_new_stream(s, 0);
236
            if (!st)
237
                return AVERROR(ENOMEM);
238
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
239
            asf_st = av_mallocz(sizeof(ASFStream));
240
            if (!asf_st)
241
                return AVERROR(ENOMEM);
242
            st->priv_data = asf_st;
243
            start_time = asf->hdr.preroll;
244

    
245
            asf_st->stream_language_index = 128; // invalid stream index means no language info
246

    
247
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
248
                st->duration = asf->hdr.send_time /
249
                    (10000000 / 1000) - start_time;
250
            }
251
            get_guid(pb, &g);
252

    
253
            test_for_ext_stream_audio = 0;
254
            if (!guidcmp(&g, &ff_asf_audio_stream)) {
255
                type = CODEC_TYPE_AUDIO;
256
            } else if (!guidcmp(&g, &ff_asf_video_stream)) {
257
                type = CODEC_TYPE_VIDEO;
258
            } else if (!guidcmp(&g, &ff_asf_command_stream)) {
259
                type = CODEC_TYPE_DATA;
260
            } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
261
                test_for_ext_stream_audio = 1;
262
                type = CODEC_TYPE_UNKNOWN;
263
            } else {
264
                return -1;
265
            }
266
            get_guid(pb, &g);
267
            total_size = get_le64(pb);
268
            type_specific_size = get_le32(pb);
269
            get_le32(pb);
270
            st->id = get_le16(pb) & 0x7f; /* stream id */
271
            // mapping of asf ID to AV stream ID;
272
            asf->asfid2avid[st->id] = s->nb_streams - 1;
273

    
274
            get_le32(pb);
275

    
276
            if (test_for_ext_stream_audio) {
277
                get_guid(pb, &g);
278
                if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
279
                    type = CODEC_TYPE_AUDIO;
280
                    is_dvr_ms_audio=1;
281
                    get_guid(pb, &g);
282
                    get_le32(pb);
283
                    get_le32(pb);
284
                    get_le32(pb);
285
                    get_guid(pb, &g);
286
                    get_le32(pb);
287
                }
288
            }
289

    
290
            st->codec->codec_type = type;
291
            if (type == CODEC_TYPE_AUDIO) {
292
                ff_get_wav_header(pb, st->codec, type_specific_size);
293
                if (is_dvr_ms_audio) {
294
                    // codec_id and codec_tag are unreliable in dvr_ms
295
                    // files. Set them later by probing stream.
296
                    st->codec->codec_id = CODEC_ID_PROBE;
297
                    st->codec->codec_tag = 0;
298
                }
299
                if (st->codec->codec_id == CODEC_ID_AAC) {
300
                    st->need_parsing = AVSTREAM_PARSE_NONE;
301
                } else {
302
                    st->need_parsing = AVSTREAM_PARSE_FULL;
303
                }
304
                /* We have to init the frame size at some point .... */
305
                pos2 = url_ftell(pb);
306
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
307
                    asf_st->ds_span = get_byte(pb);
308
                    asf_st->ds_packet_size = get_le16(pb);
309
                    asf_st->ds_chunk_size = get_le16(pb);
310
                    get_le16(pb); //ds_data_size
311
                    get_byte(pb); //ds_silence_data
312
                }
313
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
314
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
315
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
316
                if (asf_st->ds_span > 1) {
317
                    if (!asf_st->ds_chunk_size
318
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
319
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
320
                        asf_st->ds_span = 0; // disable descrambling
321
                }
322
                switch (st->codec->codec_id) {
323
                case CODEC_ID_MP3:
324
                    st->codec->frame_size = MPA_FRAME_SIZE;
325
                    break;
326
                case CODEC_ID_PCM_S16LE:
327
                case CODEC_ID_PCM_S16BE:
328
                case CODEC_ID_PCM_U16LE:
329
                case CODEC_ID_PCM_U16BE:
330
                case CODEC_ID_PCM_S8:
331
                case CODEC_ID_PCM_U8:
332
                case CODEC_ID_PCM_ALAW:
333
                case CODEC_ID_PCM_MULAW:
334
                    st->codec->frame_size = 1;
335
                    break;
336
                default:
337
                    /* This is probably wrong, but it prevents a crash later */
338
                    st->codec->frame_size = 1;
339
                    break;
340
                }
341
            } else if (type == CODEC_TYPE_VIDEO) {
342
                get_le32(pb);
343
                get_le32(pb);
344
                get_byte(pb);
345
                size = get_le16(pb); /* size */
346
                sizeX= get_le32(pb); /* size */
347
                st->codec->width = get_le32(pb);
348
                st->codec->height = get_le32(pb);
349
                /* not available for asf */
350
                get_le16(pb); /* panes */
351
                st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
352
                tag1 = get_le32(pb);
353
                url_fskip(pb, 20);
354
//                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
355
                size= sizeX;
356
                if (size > 40) {
357
                    st->codec->extradata_size = size - 40;
358
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
359
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
360
                }
361

    
362
                /* Extract palette from extradata if bpp <= 8 */
363
                /* This code assumes that extradata contains only palette */
364
                /* This is true for all paletted codecs implemented in ffmpeg */
365
                if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
366
                    st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
367
#ifdef WORDS_BIGENDIAN
368
                    for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
369
                        st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
370
#else
371
                    memcpy(st->codec->palctrl->palette, st->codec->extradata,
372
                           FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
373
#endif
374
                    st->codec->palctrl->palette_changed = 1;
375
                }
376

    
377
                st->codec->codec_tag = tag1;
378
                st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
379
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
380
                    st->need_parsing = AVSTREAM_PARSE_FULL;
381
            }
382
            pos2 = url_ftell(pb);
383
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
384
        } else if (!guidcmp(&g, &ff_asf_comment_header)) {
385
            int len1, len2, len3, len4, len5;
386

    
387
            len1 = get_le16(pb);
388
            len2 = get_le16(pb);
389
            len3 = get_le16(pb);
390
            len4 = get_le16(pb);
391
            len5 = get_le16(pb);
392
            get_tag(s, "title"    , 0, len1);
393
            get_tag(s, "author"   , 0, len2);
394
            get_tag(s, "copyright", 0, len3);
395
            get_tag(s, "comment"  , 0, len4);
396
            url_fskip(pb, len5);
397
        } else if (!guidcmp(&g, &stream_bitrate_guid)) {
398
            int stream_count = get_le16(pb);
399
            int j;
400

    
401
//            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
402
//            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
403
            for(j = 0; j < stream_count; j++) {
404
                int flags, bitrate, stream_id;
405

    
406
                flags= get_le16(pb);
407
                bitrate= get_le32(pb);
408
                stream_id= (flags & 0x7f);
409
//                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
410
                asf->stream_bitrates[stream_id]= bitrate;
411
            }
412
        } else if (!guidcmp(&g, &ff_asf_language_guid)) {
413
            int j;
414
            int stream_count = get_le16(pb);
415
            for(j = 0; j < stream_count; j++) {
416
                char lang[6];
417
                unsigned int lang_len = get_byte(pb);
418
                get_str16_nolen(pb, lang_len, lang, sizeof(lang));
419
                if (j < 128)
420
                    av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
421
            }
422
        } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
423
            int desc_count, i;
424

    
425
            desc_count = get_le16(pb);
426
            for(i=0;i<desc_count;i++) {
427
                    int name_len,value_type,value_len;
428
                    char name[1024];
429

    
430
                    name_len = get_le16(pb);
431
                    get_str16_nolen(pb, name_len, name, sizeof(name));
432
                    value_type = get_le16(pb);
433
                    value_len  = get_le16(pb);
434
                    get_tag(s, name, value_type, value_len);
435
            }
436
        } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
437
            int n, stream_num, name_len, value_len, value_type, value_num;
438
            n = get_le16(pb);
439

    
440
            for(i=0;i<n;i++) {
441
                char name[1024];
442

    
443
                get_le16(pb); //lang_list_index
444
                stream_num= get_le16(pb);
445
                name_len=   get_le16(pb);
446
                value_type= get_le16(pb);
447
                value_len=  get_le32(pb);
448

    
449
                get_str16_nolen(pb, name_len, name, sizeof(name));
450
//av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
451
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
452
                url_fskip(pb, value_len - 2);
453

    
454
                if(stream_num<128){
455
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
456
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
457
                }
458
            }
459
        } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
460
            int ext_len, payload_ext_ct, stream_ct;
461
            uint32_t ext_d, leak_rate, stream_num;
462
            unsigned int stream_languageid_index;
463

    
464
            get_le64(pb); // starttime
465
            get_le64(pb); // endtime
466
            leak_rate = get_le32(pb); // leak-datarate
467
            get_le32(pb); // bucket-datasize
468
            get_le32(pb); // init-bucket-fullness
469
            get_le32(pb); // alt-leak-datarate
470
            get_le32(pb); // alt-bucket-datasize
471
            get_le32(pb); // alt-init-bucket-fullness
472
            get_le32(pb); // max-object-size
473
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
474
            stream_num = get_le16(pb); // stream-num
475

    
476
            stream_languageid_index = get_le16(pb); // stream-language-id-index
477
            if (stream_num < 128)
478
                asf->streams[stream_num].stream_language_index = stream_languageid_index;
479

    
480
            get_le64(pb); // avg frametime in 100ns units
481
            stream_ct = get_le16(pb); //stream-name-count
482
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
483

    
484
            if (stream_num < 128)
485
                bitrate[stream_num] = leak_rate;
486

    
487
            for (i=0; i<stream_ct; i++){
488
                get_le16(pb);
489
                ext_len = get_le16(pb);
490
                url_fseek(pb, ext_len, SEEK_CUR);
491
            }
492

    
493
            for (i=0; i<payload_ext_ct; i++){
494
                get_guid(pb, &g);
495
                ext_d=get_le16(pb);
496
                ext_len=get_le32(pb);
497
                url_fseek(pb, ext_len, SEEK_CUR);
498
            }
499

    
500
            // there could be a optional stream properties object to follow
501
            // if so the next iteration will pick it up
502
        } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
503
            int v1, v2;
504
            get_guid(pb, &g);
505
            v1 = get_le32(pb);
506
            v2 = get_le16(pb);
507
#if 0
508
        } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
509
            int len, v1, n, num;
510
            char str[256], *q;
511
            char tag[16];
512

513
            get_guid(pb, &g);
514
            print_guid(&g);
515

516
            n = get_le32(pb);
517
            for(i=0;i<n;i++) {
518
                num = get_le16(pb); /* stream number */
519
                get_str16(pb, str, sizeof(str));
520
                get_str16(pb, str, sizeof(str));
521
                len = get_le16(pb);
522
                q = tag;
523
                while (len > 0) {
524
                    v1 = get_byte(pb);
525
                    if ((q - tag) < sizeof(tag) - 1)
526
                        *q++ = v1;
527
                    len--;
528
                }
529
                *q = '\0';
530
            }
531
#endif
532
        } else if (url_feof(pb)) {
533
            return -1;
534
        } else {
535
            url_fseek(pb, gsize - 24, SEEK_CUR);
536
        }
537
    }
538
    get_guid(pb, &g);
539
    get_le64(pb);
540
    get_byte(pb);
541
    get_byte(pb);
542
    if (url_feof(pb))
543
        return -1;
544
    asf->data_offset = url_ftell(pb);
545
    asf->packet_size_left = 0;
546

    
547

    
548
    for(i=0; i<128; i++){
549
        int stream_num= asf->asfid2avid[i];
550
        if(stream_num>=0){
551
            AVStream *st = s->streams[stream_num];
552
            if (!st->codec->bit_rate)
553
                st->codec->bit_rate = bitrate[i];
554
            if (dar[i].num > 0 && dar[i].den > 0)
555
                av_reduce(&st->sample_aspect_ratio.num,
556
                          &st->sample_aspect_ratio.den,
557
                          dar[i].num, dar[i].den, INT_MAX);
558
//av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
559

    
560
            // copy and convert language codes to the frontend
561
            if (asf->streams[i].stream_language_index < 128) {
562
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
563
                if (rfc1766 && strlen(rfc1766) > 1) {
564
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
565
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
566
                    if (iso6392)
567
                        av_metadata_set(&st->metadata, "language", iso6392);
568
                }
569
            }
570
        }
571
    }
572

    
573
    return 0;
574
}
575

    
576
#define DO_2BITS(bits, var, defval) \
577
    switch (bits & 3) \
578
    { \
579
    case 3: var = get_le32(pb); rsize += 4; break; \
580
    case 2: var = get_le16(pb); rsize += 2; break; \
581
    case 1: var = get_byte(pb); rsize++; break; \
582
    default: var = defval; break; \
583
    }
584

    
585
/**
586
 * Load a single ASF packet into the demuxer.
587
 * @param s demux context
588
 * @param pb context to read data from
589
 * @returns 0 on success, <0 on error
590
 */
591
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
592
{
593
    ASFContext *asf = s->priv_data;
594
    uint32_t packet_length, padsize;
595
    int rsize = 8;
596
    int c, d, e, off;
597

    
598
    off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
599

    
600
    c=d=e=-1;
601
    while(off-- > 0){
602
        c=d; d=e;
603
        e= get_byte(pb);
604
        if(c == 0x82 && !d && !e)
605
            break;
606
    }
607

    
608
    if (c != 0x82) {
609
        if (!url_feof(pb))
610
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
611
    }
612
    if ((c & 0x8f) == 0x82) {
613
        if (d || e) {
614
            if (!url_feof(pb))
615
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
616
            return -1;
617
        }
618
        c= get_byte(pb);
619
        d= get_byte(pb);
620
        rsize+=3;
621
    }else{
622
        url_fseek(pb, -1, SEEK_CUR); //FIXME
623
    }
624

    
625
    asf->packet_flags    = c;
626
    asf->packet_property = d;
627

    
628
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
629
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
630
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
631

    
632
    //the following checks prevent overflows and infinite loops
633
    if(packet_length >= (1U<<29)){
634
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
635
        return -1;
636
    }
637
    if(padsize >= packet_length){
638
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
639
        return -1;
640
    }
641

    
642
    asf->packet_timestamp = get_le32(pb);
643
    get_le16(pb); /* duration */
644
    // rsize has at least 11 bytes which have to be present
645

    
646
    if (asf->packet_flags & 0x01) {
647
        asf->packet_segsizetype = get_byte(pb); rsize++;
648
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
649
    } else {
650
        asf->packet_segments = 1;
651
        asf->packet_segsizetype = 0x80;
652
    }
653
    asf->packet_size_left = packet_length - padsize - rsize;
654
    if (packet_length < asf->hdr.min_pktsize)
655
        padsize += asf->hdr.min_pktsize - packet_length;
656
    asf->packet_padsize = padsize;
657
    dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
658
    return 0;
659
}
660

    
661
/**
662
 *
663
 * @return <0 if error
664
 */
665
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
666
    ASFContext *asf = s->priv_data;
667
    int rsize = 1;
668
    int num = get_byte(pb);
669
    int64_t ts0, ts1;
670

    
671
    asf->packet_segments--;
672
    asf->packet_key_frame = num >> 7;
673
    asf->stream_index = asf->asfid2avid[num & 0x7f];
674
    // sequence should be ignored!
675
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
676
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
677
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
678
//printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
679
    if (asf->packet_replic_size >= 8) {
680
        asf->packet_obj_size = get_le32(pb);
681
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
682
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
683
            return -1;
684
        }
685
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
686
        if(asf->packet_replic_size >= 8+38+4){
687
//            for(i=0; i<asf->packet_replic_size-8; i++)
688
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
689
//            av_log(s, AV_LOG_DEBUG, "\n");
690
            url_fskip(pb, 10);
691
            ts0= get_le64(pb);
692
            ts1= get_le64(pb);
693
            url_fskip(pb, 12);
694
            get_le32(pb);
695
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
696
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
697
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
698
        }else
699
            url_fskip(pb, asf->packet_replic_size - 8);
700
        rsize += asf->packet_replic_size; // FIXME - check validity
701
    } else if (asf->packet_replic_size==1){
702
        // multipacket - frag_offset is beginning timestamp
703
        asf->packet_time_start = asf->packet_frag_offset;
704
        asf->packet_frag_offset = 0;
705
        asf->packet_frag_timestamp = asf->packet_timestamp;
706

    
707
        asf->packet_time_delta = get_byte(pb);
708
        rsize++;
709
    }else if(asf->packet_replic_size!=0){
710
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
711
        return -1;
712
    }
713
    if (asf->packet_flags & 0x01) {
714
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
715
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
716
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
717
            return -1;
718
        }
719
        //printf("Fragsize %d\n", asf->packet_frag_size);
720
    } else {
721
        asf->packet_frag_size = asf->packet_size_left - rsize;
722
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
723
    }
724
    if (asf->packet_replic_size == 1) {
725
        asf->packet_multi_size = asf->packet_frag_size;
726
        if (asf->packet_multi_size > asf->packet_size_left)
727
            return -1;
728
    }
729
    asf->packet_size_left -= rsize;
730
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
731

    
732
    return 0;
733
}
734

    
735
/**
736
 * Parse data from individual ASF packets (which were previously loaded
737
 * with asf_get_packet()).
738
 * @param s demux context
739
 * @param pb context to read data from
740
 * @param pkt pointer to store packet data into
741
 * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
742
 *          packets need to be loaded (through asf_get_packet())
743
 */
744
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
745
{
746
    ASFContext *asf = s->priv_data;
747
    ASFStream *asf_st = 0;
748
    for (;;) {
749
        if(url_feof(pb))
750
            return AVERROR_EOF;
751
        if (asf->packet_size_left < FRAME_HEADER_SIZE
752
            || asf->packet_segments < 1) {
753
            //asf->packet_size_left <= asf->packet_padsize) {
754
            int ret = asf->packet_size_left + asf->packet_padsize;
755
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
756
            assert(ret>=0);
757
            /* fail safe */
758
            url_fskip(pb, ret);
759

    
760
            asf->packet_pos= url_ftell(pb);
761
            if (asf->data_object_size != (uint64_t)-1 &&
762
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
763
                return AVERROR_EOF; /* Do not exceed the size of the data object */
764
            return 1;
765
        }
766
        if (asf->packet_time_start == 0) {
767
            if(asf_read_frame_header(s, pb) < 0){
768
                asf->packet_segments= 0;
769
                continue;
770
            }
771
            if (asf->stream_index < 0
772
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
773
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
774
                ) {
775
                asf->packet_time_start = 0;
776
                /* unhandled packet (should not happen) */
777
                url_fskip(pb, asf->packet_frag_size);
778
                asf->packet_size_left -= asf->packet_frag_size;
779
                if(asf->stream_index < 0)
780
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
781
                continue;
782
            }
783
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
784
        }
785
        asf_st = asf->asf_st;
786

    
787
        if (asf->packet_replic_size == 1) {
788
            // frag_offset is here used as the beginning timestamp
789
            asf->packet_frag_timestamp = asf->packet_time_start;
790
            asf->packet_time_start += asf->packet_time_delta;
791
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
792
            asf->packet_size_left--;
793
            asf->packet_multi_size--;
794
            if (asf->packet_multi_size < asf->packet_obj_size)
795
            {
796
                asf->packet_time_start = 0;
797
                url_fskip(pb, asf->packet_multi_size);
798
                asf->packet_size_left -= asf->packet_multi_size;
799
                continue;
800
            }
801
            asf->packet_multi_size -= asf->packet_obj_size;
802
            //printf("COMPRESS size  %d  %d  %d   ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
803
        }
804
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
805
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
806
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
807
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
808
                asf_st->frag_offset, asf->packet_frag_size,
809
                asf->packet_obj_size, asf_st->pkt.size);
810
            asf->packet_obj_size= asf_st->pkt.size;
811
        }
812

    
813
        if (   asf_st->pkt.size != asf->packet_obj_size
814
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
815
            if(asf_st->pkt.data){
816
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
817
                asf_st->frag_offset = 0;
818
                av_free_packet(&asf_st->pkt);
819
            }
820
            /* new packet */
821
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
822
            asf_st->seq = asf->packet_seq;
823
            asf_st->pkt.dts = asf->packet_frag_timestamp;
824
            asf_st->pkt.stream_index = asf->stream_index;
825
            asf_st->pkt.pos =
826
            asf_st->packet_pos= asf->packet_pos;
827
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
828
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
829
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
830
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
831
                asf->packet_key_frame = 1;
832
            if (asf->packet_key_frame)
833
                asf_st->pkt.flags |= PKT_FLAG_KEY;
834
        }
835

    
836
        /* read data */
837
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
838
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
839
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
840
        asf->packet_size_left -= asf->packet_frag_size;
841
        if (asf->packet_size_left < 0)
842
            continue;
843

    
844
        if(   asf->packet_frag_offset >= asf_st->pkt.size
845
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
846
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
847
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
848
            continue;
849
        }
850

    
851
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
852
                   asf->packet_frag_size);
853
        if (s->key && s->keylen == 20)
854
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
855
                            asf->packet_frag_size);
856
        asf_st->frag_offset += asf->packet_frag_size;
857
        /* test if whole packet is read */
858
        if (asf_st->frag_offset == asf_st->pkt.size) {
859
            //workaround for macroshit radio DVR-MS files
860
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
861
               && asf_st->pkt.size > 100){
862
                int i;
863
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
864
                if(i == asf_st->pkt.size){
865
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
866
                    asf_st->frag_offset = 0;
867
                    av_free_packet(&asf_st->pkt);
868
                    continue;
869
                }
870
            }
871

    
872
            /* return packet */
873
            if (asf_st->ds_span > 1) {
874
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
875
                    av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
876
              }else{
877
                /* packet descrambling */
878
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
879
                if (newdata) {
880
                    int offset = 0;
881
                    while (offset < asf_st->pkt.size) {
882
                        int off = offset / asf_st->ds_chunk_size;
883
                        int row = off / asf_st->ds_span;
884
                        int col = off % asf_st->ds_span;
885
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
886
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
887

    
888
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
889
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
890
                        memcpy(newdata + offset,
891
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
892
                               asf_st->ds_chunk_size);
893
                        offset += asf_st->ds_chunk_size;
894
                    }
895
                    av_free(asf_st->pkt.data);
896
                    asf_st->pkt.data = newdata;
897
                }
898
              }
899
            }
900
            asf_st->frag_offset = 0;
901
            *pkt= asf_st->pkt;
902
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
903
            asf_st->pkt.size = 0;
904
            asf_st->pkt.data = 0;
905
            break; // packet completed
906
        }
907
    }
908
    return 0;
909
}
910

    
911
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
912
{
913
    ASFContext *asf = s->priv_data;
914

    
915
    for (;;) {
916
        int ret;
917

    
918
        /* parse cached packets, if any */
919
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
920
            return ret;
921
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
922
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
923
        asf->packet_time_start = 0;
924
    }
925

    
926
    return 0;
927
}
928

    
929
// Added to support seeking after packets have been read
930
// If information is not reset, read_packet fails due to
931
// leftover information from previous reads
932
static void asf_reset_header(AVFormatContext *s)
933
{
934
    ASFContext *asf = s->priv_data;
935
    ASFStream *asf_st;
936
    int i;
937

    
938
    asf->packet_nb_frames = 0;
939
    asf->packet_size_left = 0;
940
    asf->packet_segments = 0;
941
    asf->packet_flags = 0;
942
    asf->packet_property = 0;
943
    asf->packet_timestamp = 0;
944
    asf->packet_segsizetype = 0;
945
    asf->packet_segments = 0;
946
    asf->packet_seq = 0;
947
    asf->packet_replic_size = 0;
948
    asf->packet_key_frame = 0;
949
    asf->packet_padsize = 0;
950
    asf->packet_frag_offset = 0;
951
    asf->packet_frag_size = 0;
952
    asf->packet_frag_timestamp = 0;
953
    asf->packet_multi_size = 0;
954
    asf->packet_obj_size = 0;
955
    asf->packet_time_delta = 0;
956
    asf->packet_time_start = 0;
957

    
958
    for(i=0; i<s->nb_streams; i++){
959
        asf_st= s->streams[i]->priv_data;
960
        av_free_packet(&asf_st->pkt);
961
        asf_st->frag_offset=0;
962
        asf_st->seq=0;
963
    }
964
    asf->asf_st= NULL;
965
}
966

    
967
static int asf_read_close(AVFormatContext *s)
968
{
969
    int i;
970

    
971
    asf_reset_header(s);
972
    for(i=0;i<s->nb_streams;i++) {
973
        AVStream *st = s->streams[i];
974
        av_free(st->codec->palctrl);
975
    }
976
    return 0;
977
}
978

    
979
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
980
{
981
    AVPacket pkt1, *pkt = &pkt1;
982
    ASFStream *asf_st;
983
    int64_t pts;
984
    int64_t pos= *ppos;
985
    int i;
986
    int64_t start_pos[s->nb_streams];
987

    
988
    for(i=0; i<s->nb_streams; i++){
989
        start_pos[i]= pos;
990
    }
991

    
992
    pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
993
    *ppos= pos;
994
    url_fseek(s->pb, pos, SEEK_SET);
995

    
996
//printf("asf_read_pts\n");
997
    asf_reset_header(s);
998
    for(;;){
999
        if (av_read_frame(s, pkt) < 0){
1000
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1001
            return AV_NOPTS_VALUE;
1002
        }
1003

    
1004
        pts= pkt->pts;
1005

    
1006
        av_free_packet(pkt);
1007
        if(pkt->flags&PKT_FLAG_KEY){
1008
            i= pkt->stream_index;
1009

    
1010
            asf_st= s->streams[i]->priv_data;
1011

    
1012
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1013
            pos= asf_st->packet_pos;
1014

    
1015
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1016
            start_pos[i]= asf_st->packet_pos + 1;
1017

    
1018
            if(pkt->stream_index == stream_index)
1019
               break;
1020
        }
1021
    }
1022

    
1023
    *ppos= pos;
1024
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1025

    
1026
    return pts;
1027
}
1028

    
1029
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1030
{
1031
    ff_asf_guid g;
1032
    ASFContext *asf = s->priv_data;
1033
    int64_t current_pos= url_ftell(s->pb);
1034
    int i;
1035

    
1036
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1037
    get_guid(s->pb, &g);
1038
    if (!guidcmp(&g, &index_guid)) {
1039
        int64_t itime;
1040
        int pct, ict;
1041
        int64_t av_unused gsize= get_le64(s->pb);
1042
        get_guid(s->pb, &g);
1043
        itime=get_le64(s->pb);
1044
        pct=get_le32(s->pb);
1045
        ict=get_le32(s->pb);
1046
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1047

    
1048
        for (i=0;i<ict;i++){
1049
            int pktnum=get_le32(s->pb);
1050
            int pktct =get_le16(s->pb);
1051
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1052
            int64_t index_pts= av_rescale(itime, i, 10000);
1053

    
1054
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1055
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1056
        }
1057
        asf->index_read= 1;
1058
    }
1059
    url_fseek(s->pb, current_pos, SEEK_SET);
1060
}
1061

    
1062
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1063
{
1064
    ASFContext *asf = s->priv_data;
1065
    AVStream *st = s->streams[stream_index];
1066
    int64_t pos;
1067
    int index;
1068

    
1069
    if (s->packet_size <= 0)
1070
        return -1;
1071

    
1072
    /* Try using the protocol's read_seek if available */
1073
    if(s->pb) {
1074
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1075
        if(ret >= 0)
1076
            asf_reset_header(s);
1077
        if (ret != AVERROR(ENOSYS))
1078
            return ret;
1079
    }
1080

    
1081
    if (!asf->index_read)
1082
        asf_build_simple_index(s, stream_index);
1083

    
1084
    if(!(asf->index_read && st->index_entries)){
1085
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1086
            return -1;
1087
    }else{
1088
        index= av_index_search_timestamp(st, pts, flags);
1089
        if(index<0)
1090
            return -1;
1091

    
1092
        /* find the position */
1093
        pos = st->index_entries[index].pos;
1094

    
1095
    // various attempts to find key frame have failed so far
1096
    //    asf_reset_header(s);
1097
    //    url_fseek(s->pb, pos, SEEK_SET);
1098
    //    key_pos = pos;
1099
    //     for(i=0;i<16;i++){
1100
    //         pos = url_ftell(s->pb);
1101
    //         if (av_read_frame(s, &pkt) < 0){
1102
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1103
    //             return -1;
1104
    //         }
1105
    //         asf_st = s->streams[stream_index]->priv_data;
1106
    //         pos += st->parser->frame_offset;
1107
    //
1108
    //         if (pkt.size > b) {
1109
    //             b = pkt.size;
1110
    //             key_pos = pos;
1111
    //         }
1112
    //
1113
    //         av_free_packet(&pkt);
1114
    //     }
1115

    
1116
        /* do the seek */
1117
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1118
        url_fseek(s->pb, pos, SEEK_SET);
1119
    }
1120
    asf_reset_header(s);
1121
    return 0;
1122
}
1123

    
1124
AVInputFormat asf_demuxer = {
1125
    "asf",
1126
    NULL_IF_CONFIG_SMALL("ASF format"),
1127
    sizeof(ASFContext),
1128
    asf_probe,
1129
    asf_read_header,
1130
    asf_read_packet,
1131
    asf_read_close,
1132
    asf_read_seek,
1133
    asf_read_pts,
1134
    .metadata_conv = ff_asf_metadata_conv,
1135
};