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ffmpeg / libavformat / asf.c @ 3ba1438d

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1
/*
2
 * ASF compatible decoder.
3
 * Copyright (c) 2000, 2001 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avformat.h"
20
#include "avi.h"
21
#include "mpegaudio.h"
22
#include "asf.h"
23

    
24
#undef NDEBUG
25
#include <assert.h>
26

    
27
#define FRAME_HEADER_SIZE 17
28
// Fix Me! FRAME_HEADER_SIZE may be different. 
29

    
30
static const GUID index_guid = {
31
    0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
32
};
33

    
34
/**********************************/
35
/* decoding */
36

    
37
//#define DEBUG
38

    
39
#ifdef DEBUG
40
#define PRINT_IF_GUID(g,cmp) \
41
if (!memcmp(g, &cmp, sizeof(GUID))) \
42
    printf("(GUID: %s) ", #cmp)
43

    
44
static void print_guid(const GUID *g)
45
{
46
    int i;
47
    PRINT_IF_GUID(g, asf_header);
48
    else PRINT_IF_GUID(g, file_header);
49
    else PRINT_IF_GUID(g, stream_header);
50
    else PRINT_IF_GUID(g, audio_stream);
51
    else PRINT_IF_GUID(g, audio_conceal_none);
52
    else PRINT_IF_GUID(g, video_stream);
53
    else PRINT_IF_GUID(g, video_conceal_none);
54
    else PRINT_IF_GUID(g, comment_header);
55
    else PRINT_IF_GUID(g, codec_comment_header);
56
    else PRINT_IF_GUID(g, codec_comment1_header);
57
    else PRINT_IF_GUID(g, data_header);
58
    else PRINT_IF_GUID(g, index_guid);
59
    else PRINT_IF_GUID(g, head1_guid);
60
    else PRINT_IF_GUID(g, head2_guid);
61
    else PRINT_IF_GUID(g, my_guid);
62
    else
63
        printf("(GUID: unknown) ");
64
    printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
65
    for(i=0;i<8;i++)
66
        printf(" 0x%02x,", g->v4[i]);
67
    printf("}\n");
68
}
69
#undef PRINT_IF_GUID(g,cmp)
70
#endif
71

    
72
static void get_guid(ByteIOContext *s, GUID *g)
73
{
74
    int i;
75

    
76
    g->v1 = get_le32(s);
77
    g->v2 = get_le16(s);
78
    g->v3 = get_le16(s);
79
    for(i=0;i<8;i++)
80
        g->v4[i] = get_byte(s);
81
}
82

    
83
#if 0
84
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
85
{
86
    int len, c;
87
    char *q;
88

89
    len = get_le16(pb);
90
    q = buf;
91
    while (len > 0) {
92
        c = get_le16(pb);
93
        if ((q - buf) < buf_size - 1)
94
            *q++ = c;
95
        len--;
96
    }
97
    *q = '\0';
98
}
99
#endif
100

    
101
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
102
{
103
    int c;
104
    char *q;
105

    
106
    q = buf;
107
    while (len > 0) {
108
        c = get_le16(pb);
109
        if ((q - buf) < buf_size - 1)
110
            *q++ = c;
111
        len-=2;
112
    }
113
    *q = '\0';
114
}
115

    
116
static int asf_probe(AVProbeData *pd)
117
{
118
    GUID g;
119
    const unsigned char *p;
120
    int i;
121

    
122
    /* check file header */
123
    if (pd->buf_size <= 32)
124
        return 0;
125
    p = pd->buf;
126
    g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
127
    p += 4;
128
    g.v2 = p[0] | (p[1] << 8);
129
    p += 2;
130
    g.v3 = p[0] | (p[1] << 8);
131
    p += 2;
132
    for(i=0;i<8;i++)
133
        g.v4[i] = *p++;
134

    
135
    if (!memcmp(&g, &asf_header, sizeof(GUID)))
136
        return AVPROBE_SCORE_MAX;
137
    else
138
        return 0;
139
}
140

    
141
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
142
{
143
    ASFContext *asf = s->priv_data;
144
    GUID g;
145
    ByteIOContext *pb = &s->pb;
146
    AVStream *st;
147
    ASFStream *asf_st;
148
    int size, i;
149
    int64_t gsize;
150

    
151
    get_guid(pb, &g);
152
    if (memcmp(&g, &asf_header, sizeof(GUID)))
153
        goto fail;
154
    get_le64(pb);
155
    get_le32(pb);
156
    get_byte(pb);
157
    get_byte(pb);
158
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
159
    for(;;) {
160
        get_guid(pb, &g);
161
        gsize = get_le64(pb);
162
#ifdef DEBUG
163
        printf("%08Lx: ", url_ftell(pb) - 24);
164
        print_guid(&g);
165
        printf("  size=0x%Lx\n", gsize);
166
#endif
167
        if (gsize < 24)
168
            goto fail;
169
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
170
            get_guid(pb, &asf->hdr.guid);
171
            asf->hdr.file_size                = get_le64(pb);
172
            asf->hdr.create_time        = get_le64(pb);
173
            asf->hdr.packets_count        = get_le64(pb);
174
            asf->hdr.play_time                = get_le64(pb);
175
            asf->hdr.send_time                = get_le64(pb);
176
            asf->hdr.preroll                = get_le32(pb);
177
            asf->hdr.ignore                = get_le32(pb);
178
            asf->hdr.flags                = get_le32(pb);
179
            asf->hdr.min_pktsize        = get_le32(pb);
180
            asf->hdr.max_pktsize        = get_le32(pb);
181
            asf->hdr.max_bitrate        = get_le32(pb);
182
            asf->packet_size = asf->hdr.max_pktsize;
183
            asf->nb_packets = asf->hdr.packets_count;
184
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
185
            int type, total_size, type_specific_size;
186
            unsigned int tag1;
187
            int64_t pos1, pos2;
188

    
189
            pos1 = url_ftell(pb);
190

    
191
            st = av_new_stream(s, 0);
192
            if (!st)
193
                goto fail;
194
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
195
            asf_st = av_mallocz(sizeof(ASFStream));
196
            if (!asf_st)
197
                goto fail;
198
            st->priv_data = asf_st;
199
            st->start_time = asf->hdr.preroll / (10000000 / AV_TIME_BASE);
200
            st->duration = (asf->hdr.send_time - asf->hdr.preroll) / 
201
                (10000000 / AV_TIME_BASE);
202
            get_guid(pb, &g);
203
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
204
                type = CODEC_TYPE_AUDIO;
205
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
206
                type = CODEC_TYPE_VIDEO;
207
            } else {
208
                goto fail;
209
            }
210
            get_guid(pb, &g);
211
            total_size = get_le64(pb);
212
            type_specific_size = get_le32(pb);
213
            get_le32(pb);
214
            st->id = get_le16(pb) & 0x7f; /* stream id */
215
            // mapping of asf ID to AV stream ID;
216
            asf->asfid2avid[st->id] = s->nb_streams - 1;
217

    
218
            get_le32(pb);
219
            st->codec.codec_type = type;
220
            /* 1 fps default (XXX: put 0 fps instead) */
221
            st->codec.frame_rate = 1; 
222
            st->codec.frame_rate_base = 1;
223
            if (type == CODEC_TYPE_AUDIO) {
224
                get_wav_header(pb, &st->codec, type_specific_size);
225
                st->need_parsing = 1;
226
                /* We have to init the frame size at some point .... */
227
                pos2 = url_ftell(pb);
228
                if (gsize > (pos2 + 8 - pos1 + 24)) {
229
                    asf_st->ds_span = get_byte(pb);
230
                    asf_st->ds_packet_size = get_le16(pb);
231
                    asf_st->ds_chunk_size = get_le16(pb);
232
                    asf_st->ds_data_size = get_le16(pb);
233
                    asf_st->ds_silence_data = get_byte(pb);
234
                }
235
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
236
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
237
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
238
                if (asf_st->ds_span > 1) {
239
                    if (!asf_st->ds_chunk_size
240
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
241
                        asf_st->ds_span = 0; // disable descrambling
242
                }
243
                switch (st->codec.codec_id) {
244
                case CODEC_ID_MP3:
245
                    st->codec.frame_size = MPA_FRAME_SIZE;
246
                    break;
247
                case CODEC_ID_PCM_S16LE:
248
                case CODEC_ID_PCM_S16BE:
249
                case CODEC_ID_PCM_U16LE:
250
                case CODEC_ID_PCM_U16BE:
251
                case CODEC_ID_PCM_S8:
252
                case CODEC_ID_PCM_U8:
253
                case CODEC_ID_PCM_ALAW:
254
                case CODEC_ID_PCM_MULAW:
255
                    st->codec.frame_size = 1;
256
                    break;
257
                default:
258
                    /* This is probably wrong, but it prevents a crash later */
259
                    st->codec.frame_size = 1;
260
                    break;
261
                }
262
            } else {
263
                get_le32(pb);
264
                get_le32(pb);
265
                get_byte(pb);
266
                size = get_le16(pb); /* size */
267
                get_le32(pb); /* size */
268
                st->codec.width = get_le32(pb);
269
                st->codec.height = get_le32(pb);
270
                /* not available for asf */
271
                get_le16(pb); /* panes */
272
                st->codec.bits_per_sample = get_le16(pb); /* depth */
273
                tag1 = get_le32(pb);
274
                url_fskip(pb, 20);
275
                if (size > 40) {
276
                    st->codec.extradata_size = size - 40;
277
                    st->codec.extradata = av_mallocz(st->codec.extradata_size);
278
                    get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
279
                }
280

    
281
        /* Extract palette from extradata if bpp <= 8 */
282
        /* This code assumes that extradata contains only palette */
283
        /* This is true for all paletted codecs implemented in ffmpeg */
284
        if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
285
            st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
286
#ifdef WORDS_BIGENDIAN
287
            for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
288
                st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
289
#else
290
            memcpy(st->codec.palctrl->palette, st->codec.extradata,
291
                   FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
292
#endif
293
            st->codec.palctrl->palette_changed = 1;
294
        }
295

    
296
                st->codec.codec_tag = tag1;
297
                st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
298
            }
299
            pos2 = url_ftell(pb);
300
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
301
        } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
302
            break;
303
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
304
            int len1, len2, len3, len4, len5;
305

    
306
            len1 = get_le16(pb);
307
            len2 = get_le16(pb);
308
            len3 = get_le16(pb);
309
            len4 = get_le16(pb);
310
            len5 = get_le16(pb);
311
            get_str16_nolen(pb, len1, s->title, sizeof(s->title));
312
            get_str16_nolen(pb, len2, s->author, sizeof(s->author));
313
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
314
            get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
315
            url_fskip(pb, len5);
316
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
317
                int desc_count, i;
318

    
319
                desc_count = get_le16(pb);
320
                for(i=0;i<desc_count;i++)
321
                {
322
                        int name_len,value_type,value_len,value_num = 0;
323
                        char *name, *value;
324

    
325
                        name_len = get_le16(pb);
326
                        name = (char *)av_mallocz(name_len);
327
                        get_str16_nolen(pb, name_len, name, name_len);
328
                        value_type = get_le16(pb);
329
                        value_len = get_le16(pb);
330
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
331
                        {
332
                                value = (char *)av_mallocz(value_len);
333
                                get_str16_nolen(pb, value_len, value, value_len);
334
                                if (strcmp(name,"WM/AlbumTitle")==0) { strcpy(s->album, value); }
335
                                av_free(value);
336
                        }
337
                        if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD
338
                        {
339
                                if (value_type==2) value_num = get_le32(pb);
340
                                if (value_type==3) value_num = get_le32(pb);
341
                                if (value_type==4) value_num = get_le64(pb);
342
                                if (value_type==5) value_num = get_le16(pb);
343
                                if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
344
                                if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
345
                        }
346
                        av_free(name);
347
                }
348
#if 0
349
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
350
            int v1, v2;
351
            get_guid(pb, &g);
352
            v1 = get_le32(pb);
353
            v2 = get_le16(pb);
354
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
355
            int len, v1, n, num;
356
            char str[256], *q;
357
            char tag[16];
358

359
            get_guid(pb, &g);
360
            print_guid(&g);
361

362
            n = get_le32(pb);
363
            for(i=0;i<n;i++) {
364
                num = get_le16(pb); /* stream number */
365
                get_str16(pb, str, sizeof(str));
366
                get_str16(pb, str, sizeof(str));
367
                len = get_le16(pb);
368
                q = tag;
369
                while (len > 0) {
370
                    v1 = get_byte(pb);
371
                    if ((q - tag) < sizeof(tag) - 1)
372
                        *q++ = v1;
373
                    len--;
374
                }
375
                *q = '\0';
376
            }
377
#endif
378
        } else if (url_feof(pb)) {
379
            goto fail;
380
        } else {
381
            url_fseek(pb, gsize - 24, SEEK_CUR);
382
        }
383
    }
384
    get_guid(pb, &g);
385
    get_le64(pb);
386
    get_byte(pb);
387
    get_byte(pb);
388
    if (url_feof(pb))
389
        goto fail;
390
    asf->data_offset = url_ftell(pb);
391
    asf->packet_size_left = 0;
392

    
393
    return 0;
394

    
395
 fail:
396
     for(i=0;i<s->nb_streams;i++) {
397
        AVStream *st = s->streams[i];
398
        if (st) {
399
            av_free(st->priv_data);
400
            av_free(st->codec.extradata);
401
        }
402
        av_free(st);
403
    }
404
    return -1;
405
}
406

    
407
#define DO_2BITS(bits, var, defval) \
408
    switch (bits & 3) \
409
    { \
410
    case 3: var = get_le32(pb); rsize += 4; break; \
411
    case 2: var = get_le16(pb); rsize += 2; break; \
412
    case 1: var = get_byte(pb); rsize++; break; \
413
    default: var = defval; break; \
414
    }
415

    
416
static int asf_get_packet(AVFormatContext *s)
417
{
418
    ASFContext *asf = s->priv_data;
419
    ByteIOContext *pb = &s->pb;
420
    uint32_t packet_length, padsize;
421
    int rsize = 9;
422
    int c;
423
    
424
    if((url_ftell(&s->pb) - s->data_offset) % asf->packet_size)
425
        return -1;
426
    assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
427
    
428
    c = get_byte(pb);
429
    if (c != 0x82) {
430
        if (!url_feof(pb))
431
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
432
    }
433
    if ((c & 0x0f) == 2) { // always true for now
434
        if (get_le16(pb) != 0) {
435
            if (!url_feof(pb))
436
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
437
            return AVERROR_IO;
438
        }
439
        rsize+=2;
440
/*    }else{
441
        if (!url_feof(pb))
442
            printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
443
        return AVERROR_IO;*/
444
    }
445

    
446
    asf->packet_flags = get_byte(pb);
447
    asf->packet_property = get_byte(pb);
448

    
449
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
450
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
451
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
452

    
453
    asf->packet_timestamp = get_le32(pb);
454
    get_le16(pb); /* duration */
455
    // rsize has at least 11 bytes which have to be present
456

    
457
    if (asf->packet_flags & 0x01) {
458
        asf->packet_segsizetype = get_byte(pb); rsize++;
459
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
460
    } else {
461
        asf->packet_segments = 1;
462
        asf->packet_segsizetype = 0x80;
463
    }
464
    asf->packet_size_left = packet_length - padsize - rsize;
465
    if (packet_length < asf->hdr.min_pktsize)
466
        padsize += asf->hdr.min_pktsize - packet_length;
467
    asf->packet_padsize = padsize;
468
#ifdef DEBUG
469
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
470
#endif
471
    return 0;
472
}
473

    
474
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
475
{
476
    ASFContext *asf = s->priv_data;
477
    ASFStream *asf_st = 0;
478
    ByteIOContext *pb = &s->pb;
479
    //static int pc = 0;
480
    for (;;) {
481
        int rsize = 0;
482
        if (asf->packet_size_left < FRAME_HEADER_SIZE
483
            || asf->packet_segments < 1) {
484
            //asf->packet_size_left <= asf->packet_padsize) {
485
            int ret = asf->packet_size_left + asf->packet_padsize;
486
            //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
487
            /* fail safe */
488
            url_fskip(pb, ret);
489
            asf->packet_pos= url_ftell(&s->pb);
490
            ret = asf_get_packet(s);
491
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
492
            if (ret < 0 || url_feof(pb))
493
                return AVERROR_IO;
494
            asf->packet_time_start = 0;
495
            continue;
496
        }
497
        if (asf->packet_time_start == 0) {
498
            /* read frame header */
499
            int num = get_byte(pb);
500
            asf->packet_segments--;
501
            rsize++;
502
            asf->packet_key_frame = (num & 0x80) >> 7;
503
            asf->stream_index = asf->asfid2avid[num & 0x7f];
504
            // sequence should be ignored!
505
            DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
506
            DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
507
            DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
508
//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);
509
            if (asf->packet_replic_size > 1) {
510
                assert(asf->packet_replic_size >= 8);
511
                // it should be always at least 8 bytes - FIXME validate
512
                asf->packet_obj_size = get_le32(pb);
513
                asf->packet_frag_timestamp = get_le32(pb); // timestamp
514
                if (asf->packet_replic_size > 8)
515
                    url_fskip(pb, asf->packet_replic_size - 8);
516
                rsize += asf->packet_replic_size; // FIXME - check validity
517
            } else if (asf->packet_replic_size==1){
518
                // multipacket - frag_offset is begining timestamp
519
                asf->packet_time_start = asf->packet_frag_offset;
520
                asf->packet_frag_offset = 0;
521
                asf->packet_frag_timestamp = asf->packet_timestamp;
522

    
523
                asf->packet_time_delta = get_byte(pb);
524
                rsize++;
525
            }else{
526
                assert(asf->packet_replic_size==0);
527
            }
528
            if (asf->packet_flags & 0x01) {
529
                DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
530
#undef DO_2BITS
531
                //printf("Fragsize %d\n", asf->packet_frag_size);
532
            } else {
533
                asf->packet_frag_size = asf->packet_size_left - rsize;
534
                //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
535
            }
536
            if (asf->packet_replic_size == 1) {
537
                asf->packet_multi_size = asf->packet_frag_size;
538
                if (asf->packet_multi_size > asf->packet_size_left) {
539
                    asf->packet_segments = 0;
540
                    continue;
541
                }
542
            }
543
            asf->packet_size_left -= rsize;
544
            //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
545

    
546
            if (asf->stream_index < 0) {
547
                asf->packet_time_start = 0;
548
                /* unhandled packet (should not happen) */
549
                url_fskip(pb, asf->packet_frag_size);
550
                asf->packet_size_left -= asf->packet_frag_size;
551
                av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
552
                continue;
553
            }
554
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
555
        }
556
        asf_st = asf->asf_st;
557

    
558
        if ((asf->packet_frag_offset != asf_st->frag_offset
559
             || (asf->packet_frag_offset
560
                 && asf->packet_seq != asf_st->seq)) // seq should be ignored
561
           ) {
562
            /* cannot continue current packet: free it */
563
            // FIXME better check if packet was already allocated
564
            av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
565
                   asf_st->pkt.size,
566
                   asf->packet_obj_size,
567
                   asf->packet_frag_offset, asf_st->frag_offset,
568
                   asf->packet_seq, asf_st->seq, asf->packet_frag_size);
569
            if (asf_st->pkt.size)
570
                av_free_packet(&asf_st->pkt);
571
            asf_st->frag_offset = 0;
572
            if (asf->packet_frag_offset != 0) {
573
                url_fskip(pb, asf->packet_frag_size);
574
                av_log(s, AV_LOG_INFO, "ff asf parser skiping %db\n", asf->packet_frag_size);
575
                asf->packet_size_left -= asf->packet_frag_size;
576
                continue;
577
            }
578
        }
579
        if (asf->packet_replic_size == 1) {
580
            // frag_offset is here used as the begining timestamp
581
            asf->packet_frag_timestamp = asf->packet_time_start;
582
            asf->packet_time_start += asf->packet_time_delta;
583
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
584
            asf->packet_size_left--;
585
            asf->packet_multi_size--;
586
            if (asf->packet_multi_size < asf->packet_obj_size)
587
            {
588
                asf->packet_time_start = 0;
589
                url_fskip(pb, asf->packet_multi_size);
590
                asf->packet_size_left -= asf->packet_multi_size;
591
                continue;
592
            }
593
            asf->packet_multi_size -= asf->packet_obj_size;
594
            //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);
595
        }
596
        if (asf_st->frag_offset == 0) {
597
            /* new packet */
598
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
599
            asf_st->seq = asf->packet_seq;
600
            asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;
601
            asf_st->pkt.stream_index = asf->stream_index;
602
            asf_st->packet_pos= asf->packet_pos;            
603
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n", 
604
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
605
//s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
606
            if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO) 
607
                asf->packet_key_frame = 1;
608
            if (asf->packet_key_frame)
609
                asf_st->pkt.flags |= PKT_FLAG_KEY;
610
        }
611

    
612
        /* read data */
613
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
614
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
615
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
616
        asf->packet_size_left -= asf->packet_frag_size;
617
        if (asf->packet_size_left < 0)
618
            continue;
619
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
620
                   asf->packet_frag_size);
621
        asf_st->frag_offset += asf->packet_frag_size;
622
        /* test if whole packet is read */
623
        if (asf_st->frag_offset == asf_st->pkt.size) {
624
            /* return packet */
625
            if (asf_st->ds_span > 1) {
626
                /* packet descrambling */
627
                char* newdata = av_malloc(asf_st->pkt.size);
628
                if (newdata) {
629
                    int offset = 0;
630
                    while (offset < asf_st->pkt.size) {
631
                        int off = offset / asf_st->ds_chunk_size;
632
                        int row = off / asf_st->ds_span;
633
                        int col = off % asf_st->ds_span;
634
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
635
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
636
                        memcpy(newdata + offset,
637
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
638
                               asf_st->ds_chunk_size);
639
                        offset += asf_st->ds_chunk_size;
640
                    }
641
                    av_free(asf_st->pkt.data);
642
                    asf_st->pkt.data = newdata;
643
                }
644
            }
645
            asf_st->frag_offset = 0;
646
            memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
647
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
648
            asf_st->pkt.size = 0;
649
            asf_st->pkt.data = 0;
650
            break; // packet completed
651
        }
652
    }
653
    return 0;
654
}
655

    
656
static int asf_read_close(AVFormatContext *s)
657
{
658
    int i;
659

    
660
    for(i=0;i<s->nb_streams;i++) {
661
        AVStream *st = s->streams[i];
662
        av_free(st->priv_data);
663
        av_free(st->codec.extradata);
664
    av_free(st->codec.palctrl);
665
    }
666
    return 0;
667
}
668

    
669
// Added to support seeking after packets have been read
670
// If information is not reset, read_packet fails due to
671
// leftover information from previous reads
672
static void asf_reset_header(AVFormatContext *s)
673
{
674
    ASFContext *asf = s->priv_data;
675
    ASFStream *asf_st;
676
    int i;
677

    
678
    asf->packet_nb_frames = 0;
679
    asf->packet_timestamp_start = -1;
680
    asf->packet_timestamp_end = -1;
681
    asf->packet_size_left = 0;
682
    asf->packet_segments = 0;
683
    asf->packet_flags = 0;
684
    asf->packet_property = 0;
685
    asf->packet_timestamp = 0;
686
    asf->packet_segsizetype = 0;
687
    asf->packet_segments = 0;
688
    asf->packet_seq = 0;
689
    asf->packet_replic_size = 0;
690
    asf->packet_key_frame = 0;
691
    asf->packet_padsize = 0;
692
    asf->packet_frag_offset = 0;
693
    asf->packet_frag_size = 0;
694
    asf->packet_frag_timestamp = 0;
695
    asf->packet_multi_size = 0;
696
    asf->packet_obj_size = 0;
697
    asf->packet_time_delta = 0;
698
    asf->packet_time_start = 0;
699
    
700
    for(i=0; i<s->nb_streams; i++){
701
        asf_st= s->streams[i]->priv_data;
702
        av_free_packet(&asf_st->pkt);
703
        asf_st->frag_offset=0;
704
        asf_st->seq=0;
705
    }
706
    asf->asf_st= NULL;
707
}
708

    
709
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
710
{
711
    ASFContext *asf = s->priv_data;
712
    AVPacket pkt1, *pkt = &pkt1;
713
    ASFStream *asf_st;
714
    int64_t pts;
715
    int64_t pos= *ppos;
716
    int i;
717
    int64_t start_pos[s->nb_streams];
718
    
719
    for(i=0; i<s->nb_streams; i++){
720
        start_pos[i]= pos;
721
    }
722
    
723
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
724
    *ppos= pos;
725
    url_fseek(&s->pb, pos, SEEK_SET);
726
    
727
//printf("asf_read_pts\n");
728
    asf_reset_header(s);
729
    for(;;){
730
        if (av_read_frame(s, pkt) < 0){
731
            av_log(s, AV_LOG_INFO, "seek failed\n");
732
                return AV_NOPTS_VALUE;
733
        }
734
        
735
        pts= pkt->pts * 1000 / AV_TIME_BASE;
736

    
737
        av_free_packet(pkt);
738
        if(pkt->flags&PKT_FLAG_KEY){
739
            i= pkt->stream_index;
740

    
741
            asf_st= s->streams[i]->priv_data;
742

    
743
            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
744
            pos= asf_st->packet_pos;
745

    
746
            av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
747
            start_pos[i]= asf_st->packet_pos + 1;
748
            
749
            if(pkt->stream_index == stream_index)
750
               break;
751
        }
752
    }
753

    
754
    *ppos= pos;
755
//printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
756

    
757
    return pts;
758
}
759

    
760
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
761
{
762
    ASFContext *asf = s->priv_data;
763
    
764
    if (asf->packet_size <= 0)
765
        return -1;
766

    
767
    if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
768
        return -1;
769

    
770
    asf_reset_header(s);
771
    return 0;
772
}
773

    
774
static AVInputFormat asf_iformat = {
775
    "asf",
776
    "asf format",
777
    sizeof(ASFContext),
778
    asf_probe,
779
    asf_read_header,
780
    asf_read_packet,
781
    asf_read_close,
782
    asf_read_seek,
783
    asf_read_pts,
784
};
785

    
786
#ifdef CONFIG_ENCODERS
787
    extern AVOutputFormat asf_oformat;
788
    extern AVOutputFormat asf_stream_oformat;
789
#endif //CONFIG_ENCODERS
790

    
791
int asf_init(void)
792
{
793
    av_register_input_format(&asf_iformat);
794
#ifdef CONFIG_ENCODERS
795
    av_register_output_format(&asf_oformat);
796
    av_register_output_format(&asf_stream_oformat);
797
#endif //CONFIG_ENCODERS
798
    return 0;
799
}