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ffmpeg / libavformat / asfdec.c @ 4a3104a9

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1
/*
2
 * ASF compatible demuxer
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
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 *
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
36
#include <assert.h>
37

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

    
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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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};
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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
{
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    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);
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    else PRINT_IF_GUID(g, ff_asf_my_guid);
80
    else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
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    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);
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    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]);
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    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;
156

    
157
    if ((unsigned)len >= UINT_MAX)
158
        return;
159

    
160
    value = av_malloc(len+1);
161
    if (!value)
162
        return;
163

    
164
    if (type <= 1) {         // unicode or byte
165
        get_str16_nolen(s->pb, len, value, len);
166
    } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
167
        uint64_t num = get_value(s->pb, type);
168
        snprintf(value, len, "%"PRIu64, num);
169
    } else {
170
        url_fskip(s->pb, len);
171
        return;
172
    }
173
    if (!strncmp(key, "WM/", 3))
174
        key += 3;
175
    av_metadata_set2(&s->metadata, key, value, AV_METADATA_DONT_STRDUP_VAL);
176
}
177

    
178
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
179
{
180
    ASFContext *asf = s->priv_data;
181
    ff_asf_guid g;
182
    ByteIOContext *pb = s->pb;
183
    AVStream *st;
184
    ASFStream *asf_st;
185
    int size, i;
186
    int64_t gsize;
187
    AVRational dar[128];
188
    uint32_t bitrate[128];
189

    
190
    memset(dar, 0, sizeof(dar));
191
    memset(bitrate, 0, sizeof(bitrate));
192

    
193
    get_guid(pb, &g);
194
    if (guidcmp(&g, &ff_asf_header))
195
        return -1;
196
    get_le64(pb);
197
    get_le32(pb);
198
    get_byte(pb);
199
    get_byte(pb);
200
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
201
    for(;;) {
202
        get_guid(pb, &g);
203
        gsize = get_le64(pb);
204
        dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
205
        print_guid(&g);
206
        dprintf(s, "  size=0x%"PRIx64"\n", gsize);
207
        if (!guidcmp(&g, &ff_asf_data_header)) {
208
            asf->data_object_offset = url_ftell(pb);
209
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
210
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
211
                asf->data_object_size = gsize - 24;
212
            } else {
213
                asf->data_object_size = (uint64_t)-1;
214
            }
215
            break;
216
        }
217
        if (gsize < 24)
218
            return -1;
219
        if (!guidcmp(&g, &ff_asf_file_header)) {
220
            get_guid(pb, &asf->hdr.guid);
221
            asf->hdr.file_size          = get_le64(pb);
222
            asf->hdr.create_time        = get_le64(pb);
223
            asf->nb_packets             = get_le64(pb);
224
            asf->hdr.play_time          = get_le64(pb);
225
            asf->hdr.send_time          = get_le64(pb);
226
            asf->hdr.preroll            = get_le32(pb);
227
            asf->hdr.ignore             = get_le32(pb);
228
            asf->hdr.flags              = get_le32(pb);
229
            asf->hdr.min_pktsize        = get_le32(pb);
230
            asf->hdr.max_pktsize        = get_le32(pb);
231
            asf->hdr.max_bitrate        = get_le32(pb);
232
            s->packet_size = asf->hdr.max_pktsize;
233
        } else if (!guidcmp(&g, &ff_asf_stream_header)) {
234
            enum CodecType type;
235
            int type_specific_size, sizeX;
236
            uint64_t total_size;
237
            unsigned int tag1;
238
            int64_t pos1, pos2, start_time;
239
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
240

    
241
            pos1 = url_ftell(pb);
242

    
243
            st = av_new_stream(s, 0);
244
            if (!st)
245
                return AVERROR(ENOMEM);
246
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
247
            asf_st = av_mallocz(sizeof(ASFStream));
248
            if (!asf_st)
249
                return AVERROR(ENOMEM);
250
            st->priv_data = asf_st;
251
            start_time = asf->hdr.preroll;
252

    
253
            asf_st->stream_language_index = 128; // invalid stream index means no language info
254

    
255
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
256
                st->duration = asf->hdr.play_time /
257
                    (10000000 / 1000) - start_time;
258
            }
259
            get_guid(pb, &g);
260

    
261
            test_for_ext_stream_audio = 0;
262
            if (!guidcmp(&g, &ff_asf_audio_stream)) {
263
                type = CODEC_TYPE_AUDIO;
264
            } else if (!guidcmp(&g, &ff_asf_video_stream)) {
265
                type = CODEC_TYPE_VIDEO;
266
            } else if (!guidcmp(&g, &ff_asf_command_stream)) {
267
                type = CODEC_TYPE_DATA;
268
            } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
269
                test_for_ext_stream_audio = 1;
270
                type = CODEC_TYPE_UNKNOWN;
271
            } else {
272
                return -1;
273
            }
274
            get_guid(pb, &g);
275
            total_size = get_le64(pb);
276
            type_specific_size = get_le32(pb);
277
            get_le32(pb);
278
            st->id = get_le16(pb) & 0x7f; /* stream id */
279
            // mapping of asf ID to AV stream ID;
280
            asf->asfid2avid[st->id] = s->nb_streams - 1;
281

    
282
            get_le32(pb);
283

    
284
            if (test_for_ext_stream_audio) {
285
                get_guid(pb, &g);
286
                if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
287
                    type = CODEC_TYPE_AUDIO;
288
                    is_dvr_ms_audio=1;
289
                    get_guid(pb, &g);
290
                    get_le32(pb);
291
                    get_le32(pb);
292
                    get_le32(pb);
293
                    get_guid(pb, &g);
294
                    get_le32(pb);
295
                }
296
            }
297

    
298
            st->codec->codec_type = type;
299
            if (type == CODEC_TYPE_AUDIO) {
300
                ff_get_wav_header(pb, st->codec, type_specific_size);
301
                if (is_dvr_ms_audio) {
302
                    // codec_id and codec_tag are unreliable in dvr_ms
303
                    // files. Set them later by probing stream.
304
                    st->codec->codec_id = CODEC_ID_PROBE;
305
                    st->codec->codec_tag = 0;
306
                }
307
                if (st->codec->codec_id == CODEC_ID_AAC) {
308
                    st->need_parsing = AVSTREAM_PARSE_NONE;
309
                } else {
310
                    st->need_parsing = AVSTREAM_PARSE_FULL;
311
                }
312
                /* We have to init the frame size at some point .... */
313
                pos2 = url_ftell(pb);
314
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
315
                    asf_st->ds_span = get_byte(pb);
316
                    asf_st->ds_packet_size = get_le16(pb);
317
                    asf_st->ds_chunk_size = get_le16(pb);
318
                    get_le16(pb); //ds_data_size
319
                    get_byte(pb); //ds_silence_data
320
                }
321
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
322
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
323
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
324
                if (asf_st->ds_span > 1) {
325
                    if (!asf_st->ds_chunk_size
326
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
327
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
328
                        asf_st->ds_span = 0; // disable descrambling
329
                }
330
                switch (st->codec->codec_id) {
331
                case CODEC_ID_MP3:
332
                    st->codec->frame_size = MPA_FRAME_SIZE;
333
                    break;
334
                case CODEC_ID_PCM_S16LE:
335
                case CODEC_ID_PCM_S16BE:
336
                case CODEC_ID_PCM_U16LE:
337
                case CODEC_ID_PCM_U16BE:
338
                case CODEC_ID_PCM_S8:
339
                case CODEC_ID_PCM_U8:
340
                case CODEC_ID_PCM_ALAW:
341
                case CODEC_ID_PCM_MULAW:
342
                    st->codec->frame_size = 1;
343
                    break;
344
                default:
345
                    /* This is probably wrong, but it prevents a crash later */
346
                    st->codec->frame_size = 1;
347
                    break;
348
                }
349
            } else if (type == CODEC_TYPE_VIDEO) {
350
                get_le32(pb);
351
                get_le32(pb);
352
                get_byte(pb);
353
                size = get_le16(pb); /* size */
354
                sizeX= get_le32(pb); /* size */
355
                st->codec->width = get_le32(pb);
356
                st->codec->height = get_le32(pb);
357
                /* not available for asf */
358
                get_le16(pb); /* panes */
359
                st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
360
                tag1 = get_le32(pb);
361
                url_fskip(pb, 20);
362
//                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
363
                size= sizeX;
364
                if (size > 40) {
365
                    st->codec->extradata_size = size - 40;
366
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
367
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
368
                }
369

    
370
                /* Extract palette from extradata if bpp <= 8 */
371
                /* This code assumes that extradata contains only palette */
372
                /* This is true for all paletted codecs implemented in ffmpeg */
373
                if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
374
                    st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
375
#if HAVE_BIGENDIAN
376
                    for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
377
                        st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
378
#else
379
                    memcpy(st->codec->palctrl->palette, st->codec->extradata,
380
                           FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
381
#endif
382
                    st->codec->palctrl->palette_changed = 1;
383
                }
384

    
385
                st->codec->codec_tag = tag1;
386
                st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
387
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
388
                    st->need_parsing = AVSTREAM_PARSE_FULL;
389
            }
390
            pos2 = url_ftell(pb);
391
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
392
        } else if (!guidcmp(&g, &ff_asf_comment_header)) {
393
            int len1, len2, len3, len4, len5;
394

    
395
            len1 = get_le16(pb);
396
            len2 = get_le16(pb);
397
            len3 = get_le16(pb);
398
            len4 = get_le16(pb);
399
            len5 = get_le16(pb);
400
            get_tag(s, "title"    , 0, len1);
401
            get_tag(s, "author"   , 0, len2);
402
            get_tag(s, "copyright", 0, len3);
403
            get_tag(s, "comment"  , 0, len4);
404
            url_fskip(pb, len5);
405
        } else if (!guidcmp(&g, &stream_bitrate_guid)) {
406
            int stream_count = get_le16(pb);
407
            int j;
408

    
409
//            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
410
//            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
411
            for(j = 0; j < stream_count; j++) {
412
                int flags, bitrate, stream_id;
413

    
414
                flags= get_le16(pb);
415
                bitrate= get_le32(pb);
416
                stream_id= (flags & 0x7f);
417
//                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
418
                asf->stream_bitrates[stream_id]= bitrate;
419
            }
420
        } else if (!guidcmp(&g, &ff_asf_language_guid)) {
421
            int j;
422
            int stream_count = get_le16(pb);
423
            for(j = 0; j < stream_count; j++) {
424
                char lang[6];
425
                unsigned int lang_len = get_byte(pb);
426
                get_str16_nolen(pb, lang_len, lang, sizeof(lang));
427
                if (j < 128)
428
                    av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
429
            }
430
        } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
431
            int desc_count, i;
432

    
433
            desc_count = get_le16(pb);
434
            for(i=0;i<desc_count;i++) {
435
                    int name_len,value_type,value_len;
436
                    char name[1024];
437

    
438
                    name_len = get_le16(pb);
439
                    if (name_len%2)     // must be even, broken lavf versions wrote len-1
440
                        name_len += 1;
441
                    get_str16_nolen(pb, name_len, name, sizeof(name));
442
                    value_type = get_le16(pb);
443
                    value_len  = get_le16(pb);
444
                    if (value_len%2)
445
                        value_len += 1;
446
                    get_tag(s, name, value_type, value_len);
447
            }
448
        } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
449
            int n, stream_num, name_len, value_len, value_type, value_num;
450
            n = get_le16(pb);
451

    
452
            for(i=0;i<n;i++) {
453
                char name[1024];
454

    
455
                get_le16(pb); //lang_list_index
456
                stream_num= get_le16(pb);
457
                name_len=   get_le16(pb);
458
                value_type= get_le16(pb);
459
                value_len=  get_le32(pb);
460

    
461
                get_str16_nolen(pb, name_len, name, sizeof(name));
462
//av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
463
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
464
                url_fskip(pb, value_len - 2);
465

    
466
                if(stream_num<128){
467
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
468
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
469
                }
470
            }
471
        } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
472
            int ext_len, payload_ext_ct, stream_ct;
473
            uint32_t ext_d, leak_rate, stream_num;
474
            unsigned int stream_languageid_index;
475

    
476
            get_le64(pb); // starttime
477
            get_le64(pb); // endtime
478
            leak_rate = get_le32(pb); // leak-datarate
479
            get_le32(pb); // bucket-datasize
480
            get_le32(pb); // init-bucket-fullness
481
            get_le32(pb); // alt-leak-datarate
482
            get_le32(pb); // alt-bucket-datasize
483
            get_le32(pb); // alt-init-bucket-fullness
484
            get_le32(pb); // max-object-size
485
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
486
            stream_num = get_le16(pb); // stream-num
487

    
488
            stream_languageid_index = get_le16(pb); // stream-language-id-index
489
            if (stream_num < 128)
490
                asf->streams[stream_num].stream_language_index = stream_languageid_index;
491

    
492
            get_le64(pb); // avg frametime in 100ns units
493
            stream_ct = get_le16(pb); //stream-name-count
494
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
495

    
496
            if (stream_num < 128)
497
                bitrate[stream_num] = leak_rate;
498

    
499
            for (i=0; i<stream_ct; i++){
500
                get_le16(pb);
501
                ext_len = get_le16(pb);
502
                url_fseek(pb, ext_len, SEEK_CUR);
503
            }
504

    
505
            for (i=0; i<payload_ext_ct; i++){
506
                get_guid(pb, &g);
507
                ext_d=get_le16(pb);
508
                ext_len=get_le32(pb);
509
                url_fseek(pb, ext_len, SEEK_CUR);
510
            }
511

    
512
            // there could be a optional stream properties object to follow
513
            // if so the next iteration will pick it up
514
        } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
515
            int v1, v2;
516
            get_guid(pb, &g);
517
            v1 = get_le32(pb);
518
            v2 = get_le16(pb);
519
#if 0
520
        } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
521
            int len, v1, n, num;
522
            char str[256], *q;
523
            char tag[16];
524

525
            get_guid(pb, &g);
526
            print_guid(&g);
527

528
            n = get_le32(pb);
529
            for(i=0;i<n;i++) {
530
                num = get_le16(pb); /* stream number */
531
                get_str16(pb, str, sizeof(str));
532
                get_str16(pb, str, sizeof(str));
533
                len = get_le16(pb);
534
                q = tag;
535
                while (len > 0) {
536
                    v1 = get_byte(pb);
537
                    if ((q - tag) < sizeof(tag) - 1)
538
                        *q++ = v1;
539
                    len--;
540
                }
541
                *q = '\0';
542
            }
543
#endif
544
        } else if (url_feof(pb)) {
545
            return -1;
546
        } else {
547
            if (!s->keylen) {
548
                if (!guidcmp(&g, &ff_asf_content_encryption)) {
549
                    av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
550
                } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
551
                    av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
552
                } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
553
                    av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
554
                }
555
            }
556
            url_fseek(pb, gsize - 24, SEEK_CUR);
557
        }
558
    }
559
    get_guid(pb, &g);
560
    get_le64(pb);
561
    get_byte(pb);
562
    get_byte(pb);
563
    if (url_feof(pb))
564
        return -1;
565
    asf->data_offset = url_ftell(pb);
566
    asf->packet_size_left = 0;
567

    
568

    
569
    for(i=0; i<128; i++){
570
        int stream_num= asf->asfid2avid[i];
571
        if(stream_num>=0){
572
            AVStream *st = s->streams[stream_num];
573
            if (!st->codec->bit_rate)
574
                st->codec->bit_rate = bitrate[i];
575
            if (dar[i].num > 0 && dar[i].den > 0)
576
                av_reduce(&st->sample_aspect_ratio.num,
577
                          &st->sample_aspect_ratio.den,
578
                          dar[i].num, dar[i].den, INT_MAX);
579
//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);
580

    
581
            // copy and convert language codes to the frontend
582
            if (asf->streams[i].stream_language_index < 128) {
583
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
584
                if (rfc1766 && strlen(rfc1766) > 1) {
585
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
586
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
587
                    if (iso6392)
588
                        av_metadata_set(&st->metadata, "language", iso6392);
589
                }
590
            }
591
        }
592
    }
593

    
594
    return 0;
595
}
596

    
597
#define DO_2BITS(bits, var, defval) \
598
    switch (bits & 3) \
599
    { \
600
    case 3: var = get_le32(pb); rsize += 4; break; \
601
    case 2: var = get_le16(pb); rsize += 2; break; \
602
    case 1: var = get_byte(pb); rsize++; break; \
603
    default: var = defval; break; \
604
    }
605

    
606
/**
607
 * Load a single ASF packet into the demuxer.
608
 * @param s demux context
609
 * @param pb context to read data from
610
 * @returns 0 on success, <0 on error
611
 */
612
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
613
{
614
    ASFContext *asf = s->priv_data;
615
    uint32_t packet_length, padsize;
616
    int rsize = 8;
617
    int c, d, e, off;
618

    
619
    // if we do not know packet size, allow skipping up to 32 kB
620
    off= 32768;
621
    if (s->packet_size > 0)
622
        off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
623

    
624
    c=d=e=-1;
625
    while(off-- > 0){
626
        c=d; d=e;
627
        e= get_byte(pb);
628
        if(c == 0x82 && !d && !e)
629
            break;
630
    }
631

    
632
    if (c != 0x82) {
633
        /**
634
         * This code allows handling of -EAGAIN at packet boundaries (i.e.
635
         * if the packet sync code above triggers -EAGAIN). This does not
636
         * imply complete -EAGAIN handling support at random positions in
637
         * the stream.
638
         */
639
        if (url_ferror(pb) == AVERROR(EAGAIN))
640
            return AVERROR(EAGAIN);
641
        if (!url_feof(pb))
642
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
643
    }
644
    if ((c & 0x8f) == 0x82) {
645
        if (d || e) {
646
            if (!url_feof(pb))
647
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
648
            return -1;
649
        }
650
        c= get_byte(pb);
651
        d= get_byte(pb);
652
        rsize+=3;
653
    }else{
654
        url_fseek(pb, -1, SEEK_CUR); //FIXME
655
    }
656

    
657
    asf->packet_flags    = c;
658
    asf->packet_property = d;
659

    
660
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
661
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
662
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
663

    
664
    //the following checks prevent overflows and infinite loops
665
    if(!packet_length || packet_length >= (1U<<29)){
666
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
667
        return -1;
668
    }
669
    if(padsize >= packet_length){
670
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
671
        return -1;
672
    }
673

    
674
    asf->packet_timestamp = get_le32(pb);
675
    get_le16(pb); /* duration */
676
    // rsize has at least 11 bytes which have to be present
677

    
678
    if (asf->packet_flags & 0x01) {
679
        asf->packet_segsizetype = get_byte(pb); rsize++;
680
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
681
    } else {
682
        asf->packet_segments = 1;
683
        asf->packet_segsizetype = 0x80;
684
    }
685
    asf->packet_size_left = packet_length - padsize - rsize;
686
    if (packet_length < asf->hdr.min_pktsize)
687
        padsize += asf->hdr.min_pktsize - packet_length;
688
    asf->packet_padsize = padsize;
689
    dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
690
    return 0;
691
}
692

    
693
/**
694
 *
695
 * @return <0 if error
696
 */
697
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
698
    ASFContext *asf = s->priv_data;
699
    int rsize = 1;
700
    int num = get_byte(pb);
701
    int64_t ts0, ts1;
702

    
703
    asf->packet_segments--;
704
    asf->packet_key_frame = num >> 7;
705
    asf->stream_index = asf->asfid2avid[num & 0x7f];
706
    // sequence should be ignored!
707
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
708
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
709
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
710
//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);
711
    if (asf->packet_replic_size >= 8) {
712
        asf->packet_obj_size = get_le32(pb);
713
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
714
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
715
            return -1;
716
        }
717
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
718
        if(asf->packet_replic_size >= 8+38+4){
719
//            for(i=0; i<asf->packet_replic_size-8; i++)
720
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
721
//            av_log(s, AV_LOG_DEBUG, "\n");
722
            url_fskip(pb, 10);
723
            ts0= get_le64(pb);
724
            ts1= get_le64(pb);
725
            url_fskip(pb, 12);
726
            get_le32(pb);
727
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
728
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
729
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
730
        }else
731
            url_fskip(pb, asf->packet_replic_size - 8);
732
        rsize += asf->packet_replic_size; // FIXME - check validity
733
    } else if (asf->packet_replic_size==1){
734
        // multipacket - frag_offset is beginning timestamp
735
        asf->packet_time_start = asf->packet_frag_offset;
736
        asf->packet_frag_offset = 0;
737
        asf->packet_frag_timestamp = asf->packet_timestamp;
738

    
739
        asf->packet_time_delta = get_byte(pb);
740
        rsize++;
741
    }else if(asf->packet_replic_size!=0){
742
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
743
        return -1;
744
    }
745
    if (asf->packet_flags & 0x01) {
746
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
747
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
748
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
749
            return -1;
750
        }
751
        //printf("Fragsize %d\n", asf->packet_frag_size);
752
    } else {
753
        asf->packet_frag_size = asf->packet_size_left - rsize;
754
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
755
    }
756
    if (asf->packet_replic_size == 1) {
757
        asf->packet_multi_size = asf->packet_frag_size;
758
        if (asf->packet_multi_size > asf->packet_size_left)
759
            return -1;
760
    }
761
    asf->packet_size_left -= rsize;
762
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
763

    
764
    return 0;
765
}
766

    
767
/**
768
 * Parse data from individual ASF packets (which were previously loaded
769
 * with asf_get_packet()).
770
 * @param s demux context
771
 * @param pb context to read data from
772
 * @param pkt pointer to store packet data into
773
 * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
774
 *          packets need to be loaded (through asf_get_packet())
775
 */
776
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
777
{
778
    ASFContext *asf = s->priv_data;
779
    ASFStream *asf_st = 0;
780
    for (;;) {
781
        if(url_feof(pb))
782
            return AVERROR_EOF;
783
        if (asf->packet_size_left < FRAME_HEADER_SIZE
784
            || asf->packet_segments < 1) {
785
            //asf->packet_size_left <= asf->packet_padsize) {
786
            int ret = asf->packet_size_left + asf->packet_padsize;
787
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
788
            assert(ret>=0);
789
            /* fail safe */
790
            url_fskip(pb, ret);
791

    
792
            asf->packet_pos= url_ftell(pb);
793
            if (asf->data_object_size != (uint64_t)-1 &&
794
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
795
                return AVERROR_EOF; /* Do not exceed the size of the data object */
796
            return 1;
797
        }
798
        if (asf->packet_time_start == 0) {
799
            if(asf_read_frame_header(s, pb) < 0){
800
                asf->packet_segments= 0;
801
                continue;
802
            }
803
            if (asf->stream_index < 0
804
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
805
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
806
                ) {
807
                asf->packet_time_start = 0;
808
                /* unhandled packet (should not happen) */
809
                url_fskip(pb, asf->packet_frag_size);
810
                asf->packet_size_left -= asf->packet_frag_size;
811
                if(asf->stream_index < 0)
812
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
813
                continue;
814
            }
815
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
816
        }
817
        asf_st = asf->asf_st;
818

    
819
        if (asf->packet_replic_size == 1) {
820
            // frag_offset is here used as the beginning timestamp
821
            asf->packet_frag_timestamp = asf->packet_time_start;
822
            asf->packet_time_start += asf->packet_time_delta;
823
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
824
            asf->packet_size_left--;
825
            asf->packet_multi_size--;
826
            if (asf->packet_multi_size < asf->packet_obj_size)
827
            {
828
                asf->packet_time_start = 0;
829
                url_fskip(pb, asf->packet_multi_size);
830
                asf->packet_size_left -= asf->packet_multi_size;
831
                continue;
832
            }
833
            asf->packet_multi_size -= asf->packet_obj_size;
834
            //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);
835
        }
836
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
837
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
838
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
839
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
840
                asf_st->frag_offset, asf->packet_frag_size,
841
                asf->packet_obj_size, asf_st->pkt.size);
842
            asf->packet_obj_size= asf_st->pkt.size;
843
        }
844

    
845
        if (   asf_st->pkt.size != asf->packet_obj_size
846
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
847
            if(asf_st->pkt.data){
848
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
849
                asf_st->frag_offset = 0;
850
                av_free_packet(&asf_st->pkt);
851
            }
852
            /* new packet */
853
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
854
            asf_st->seq = asf->packet_seq;
855
            asf_st->pkt.dts = asf->packet_frag_timestamp;
856
            asf_st->pkt.stream_index = asf->stream_index;
857
            asf_st->pkt.pos =
858
            asf_st->packet_pos= asf->packet_pos;
859
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
860
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
861
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
862
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
863
                asf->packet_key_frame = 1;
864
            if (asf->packet_key_frame)
865
                asf_st->pkt.flags |= PKT_FLAG_KEY;
866
        }
867

    
868
        /* read data */
869
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
870
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
871
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
872
        asf->packet_size_left -= asf->packet_frag_size;
873
        if (asf->packet_size_left < 0)
874
            continue;
875

    
876
        if(   asf->packet_frag_offset >= asf_st->pkt.size
877
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
878
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
879
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
880
            continue;
881
        }
882

    
883
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
884
                   asf->packet_frag_size);
885
        if (s->key && s->keylen == 20)
886
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
887
                            asf->packet_frag_size);
888
        asf_st->frag_offset += asf->packet_frag_size;
889
        /* test if whole packet is read */
890
        if (asf_st->frag_offset == asf_st->pkt.size) {
891
            //workaround for macroshit radio DVR-MS files
892
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
893
               && asf_st->pkt.size > 100){
894
                int i;
895
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
896
                if(i == asf_st->pkt.size){
897
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
898
                    asf_st->frag_offset = 0;
899
                    av_free_packet(&asf_st->pkt);
900
                    continue;
901
                }
902
            }
903

    
904
            /* return packet */
905
            if (asf_st->ds_span > 1) {
906
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
907
                    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);
908
              }else{
909
                /* packet descrambling */
910
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
911
                if (newdata) {
912
                    int offset = 0;
913
                    while (offset < asf_st->pkt.size) {
914
                        int off = offset / asf_st->ds_chunk_size;
915
                        int row = off / asf_st->ds_span;
916
                        int col = off % asf_st->ds_span;
917
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
918
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
919

    
920
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
921
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
922
                        memcpy(newdata + offset,
923
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
924
                               asf_st->ds_chunk_size);
925
                        offset += asf_st->ds_chunk_size;
926
                    }
927
                    av_free(asf_st->pkt.data);
928
                    asf_st->pkt.data = newdata;
929
                }
930
              }
931
            }
932
            asf_st->frag_offset = 0;
933
            *pkt= asf_st->pkt;
934
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
935
            asf_st->pkt.size = 0;
936
            asf_st->pkt.data = 0;
937
            break; // packet completed
938
        }
939
    }
940
    return 0;
941
}
942

    
943
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
944
{
945
    ASFContext *asf = s->priv_data;
946

    
947
    for (;;) {
948
        int ret;
949

    
950
        /* parse cached packets, if any */
951
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
952
            return ret;
953
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
954
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
955
        asf->packet_time_start = 0;
956
    }
957

    
958
    return 0;
959
}
960

    
961
// Added to support seeking after packets have been read
962
// If information is not reset, read_packet fails due to
963
// leftover information from previous reads
964
static void asf_reset_header(AVFormatContext *s)
965
{
966
    ASFContext *asf = s->priv_data;
967
    ASFStream *asf_st;
968
    int i;
969

    
970
    asf->packet_nb_frames = 0;
971
    asf->packet_size_left = 0;
972
    asf->packet_segments = 0;
973
    asf->packet_flags = 0;
974
    asf->packet_property = 0;
975
    asf->packet_timestamp = 0;
976
    asf->packet_segsizetype = 0;
977
    asf->packet_segments = 0;
978
    asf->packet_seq = 0;
979
    asf->packet_replic_size = 0;
980
    asf->packet_key_frame = 0;
981
    asf->packet_padsize = 0;
982
    asf->packet_frag_offset = 0;
983
    asf->packet_frag_size = 0;
984
    asf->packet_frag_timestamp = 0;
985
    asf->packet_multi_size = 0;
986
    asf->packet_obj_size = 0;
987
    asf->packet_time_delta = 0;
988
    asf->packet_time_start = 0;
989

    
990
    for(i=0; i<s->nb_streams; i++){
991
        asf_st= s->streams[i]->priv_data;
992
        av_free_packet(&asf_st->pkt);
993
        asf_st->frag_offset=0;
994
        asf_st->seq=0;
995
    }
996
    asf->asf_st= NULL;
997
}
998

    
999
static int asf_read_close(AVFormatContext *s)
1000
{
1001
    int i;
1002

    
1003
    asf_reset_header(s);
1004
    for(i=0;i<s->nb_streams;i++) {
1005
        AVStream *st = s->streams[i];
1006
        av_free(st->codec->palctrl);
1007
    }
1008
    return 0;
1009
}
1010

    
1011
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1012
{
1013
    AVPacket pkt1, *pkt = &pkt1;
1014
    ASFStream *asf_st;
1015
    int64_t pts;
1016
    int64_t pos= *ppos;
1017
    int i;
1018
    int64_t start_pos[s->nb_streams];
1019

    
1020
    for(i=0; i<s->nb_streams; i++){
1021
        start_pos[i]= pos;
1022
    }
1023

    
1024
    if (s->packet_size > 0)
1025
        pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1026
    *ppos= pos;
1027
    url_fseek(s->pb, pos, SEEK_SET);
1028

    
1029
//printf("asf_read_pts\n");
1030
    asf_reset_header(s);
1031
    for(;;){
1032
        if (av_read_frame(s, pkt) < 0){
1033
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1034
            return AV_NOPTS_VALUE;
1035
        }
1036

    
1037
        pts= pkt->pts;
1038

    
1039
        av_free_packet(pkt);
1040
        if(pkt->flags&PKT_FLAG_KEY){
1041
            i= pkt->stream_index;
1042

    
1043
            asf_st= s->streams[i]->priv_data;
1044

    
1045
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1046
            pos= asf_st->packet_pos;
1047

    
1048
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1049
            start_pos[i]= asf_st->packet_pos + 1;
1050

    
1051
            if(pkt->stream_index == stream_index)
1052
               break;
1053
        }
1054
    }
1055

    
1056
    *ppos= pos;
1057
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1058

    
1059
    return pts;
1060
}
1061

    
1062
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1063
{
1064
    ff_asf_guid g;
1065
    ASFContext *asf = s->priv_data;
1066
    int64_t current_pos= url_ftell(s->pb);
1067
    int i;
1068

    
1069
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1070
    get_guid(s->pb, &g);
1071
    if (!guidcmp(&g, &index_guid)) {
1072
        int64_t itime, last_pos=-1;
1073
        int pct, ict;
1074
        int64_t av_unused gsize= get_le64(s->pb);
1075
        get_guid(s->pb, &g);
1076
        itime=get_le64(s->pb);
1077
        pct=get_le32(s->pb);
1078
        ict=get_le32(s->pb);
1079
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1080

    
1081
        for (i=0;i<ict;i++){
1082
            int pktnum=get_le32(s->pb);
1083
            int pktct =get_le16(s->pb);
1084
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1085
            int64_t index_pts= av_rescale(itime, i, 10000);
1086

    
1087
            if(pos != last_pos){
1088
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1089
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1090
            last_pos=pos;
1091
            }
1092
        }
1093
        asf->index_read= 1;
1094
    }
1095
    url_fseek(s->pb, current_pos, SEEK_SET);
1096
}
1097

    
1098
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1099
{
1100
    ASFContext *asf = s->priv_data;
1101
    AVStream *st = s->streams[stream_index];
1102
    int64_t pos;
1103
    int index;
1104

    
1105
    if (s->packet_size <= 0)
1106
        return -1;
1107

    
1108
    /* Try using the protocol's read_seek if available */
1109
    if(s->pb) {
1110
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1111
        if(ret >= 0)
1112
            asf_reset_header(s);
1113
        if (ret != AVERROR(ENOSYS))
1114
            return ret;
1115
    }
1116

    
1117
    if (!asf->index_read)
1118
        asf_build_simple_index(s, stream_index);
1119

    
1120
    if(!(asf->index_read && st->index_entries)){
1121
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1122
            return -1;
1123
    }else{
1124
        index= av_index_search_timestamp(st, pts, flags);
1125
        if(index<0)
1126
            return -1;
1127

    
1128
        /* find the position */
1129
        pos = st->index_entries[index].pos;
1130

    
1131
    // various attempts to find key frame have failed so far
1132
    //    asf_reset_header(s);
1133
    //    url_fseek(s->pb, pos, SEEK_SET);
1134
    //    key_pos = pos;
1135
    //     for(i=0;i<16;i++){
1136
    //         pos = url_ftell(s->pb);
1137
    //         if (av_read_frame(s, &pkt) < 0){
1138
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1139
    //             return -1;
1140
    //         }
1141
    //         asf_st = s->streams[stream_index]->priv_data;
1142
    //         pos += st->parser->frame_offset;
1143
    //
1144
    //         if (pkt.size > b) {
1145
    //             b = pkt.size;
1146
    //             key_pos = pos;
1147
    //         }
1148
    //
1149
    //         av_free_packet(&pkt);
1150
    //     }
1151

    
1152
        /* do the seek */
1153
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1154
        url_fseek(s->pb, pos, SEEK_SET);
1155
    }
1156
    asf_reset_header(s);
1157
    return 0;
1158
}
1159

    
1160
AVInputFormat asf_demuxer = {
1161
    "asf",
1162
    NULL_IF_CONFIG_SMALL("ASF format"),
1163
    sizeof(ASFContext),
1164
    asf_probe,
1165
    asf_read_header,
1166
    asf_read_packet,
1167
    asf_read_close,
1168
    asf_read_seek,
1169
    asf_read_pts,
1170
    .metadata_conv = ff_asf_metadata_conv,
1171
};