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ffmpeg / libavformat / asf.c @ 5509bffa

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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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, command_stream);
55
    else PRINT_IF_GUID(g, comment_header);
56
    else PRINT_IF_GUID(g, codec_comment_header);
57
    else PRINT_IF_GUID(g, codec_comment1_header);
58
    else PRINT_IF_GUID(g, data_header);
59
    else PRINT_IF_GUID(g, index_guid);
60
    else PRINT_IF_GUID(g, head1_guid);
61
    else PRINT_IF_GUID(g, head2_guid);
62
    else PRINT_IF_GUID(g, my_guid);
63
    else
64
        printf("(GUID: unknown) ");
65
    printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
66
    for(i=0;i<8;i++)
67
        printf(" 0x%02x,", g->v4[i]);
68
    printf("}\n");
69
}
70
#undef PRINT_IF_GUID(g,cmp)
71
#endif
72

    
73
static void get_guid(ByteIOContext *s, GUID *g)
74
{
75
    int i;
76

    
77
    g->v1 = get_le32(s);
78
    g->v2 = get_le16(s);
79
    g->v3 = get_le16(s);
80
    for(i=0;i<8;i++)
81
        g->v4[i] = get_byte(s);
82
}
83

    
84
#if 0
85
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
86
{
87
    int len, c;
88
    char *q;
89

90
    len = get_le16(pb);
91
    q = buf;
92
    while (len > 0) {
93
        c = get_le16(pb);
94
        if ((q - buf) < buf_size - 1)
95
            *q++ = c;
96
        len--;
97
    }
98
    *q = '\0';
99
}
100
#endif
101

    
102
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
103
{
104
    int c;
105
    char *q;
106

    
107
    q = buf;
108
    while (len > 0) {
109
        c = get_le16(pb);
110
        if ((q - buf) < buf_size - 1)
111
            *q++ = c;
112
        len-=2;
113
    }
114
    *q = '\0';
115
}
116

    
117
static int asf_probe(AVProbeData *pd)
118
{
119
    GUID g;
120
    const unsigned char *p;
121
    int i;
122

    
123
    /* check file header */
124
    if (pd->buf_size <= 32)
125
        return 0;
126
    p = pd->buf;
127
    g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
128
    p += 4;
129
    g.v2 = p[0] | (p[1] << 8);
130
    p += 2;
131
    g.v3 = p[0] | (p[1] << 8);
132
    p += 2;
133
    for(i=0;i<8;i++)
134
        g.v4[i] = *p++;
135

    
136
    if (!memcmp(&g, &asf_header, sizeof(GUID)))
137
        return AVPROBE_SCORE_MAX;
138
    else
139
        return 0;
140
}
141

    
142
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
143
{
144
    ASFContext *asf = s->priv_data;
145
    GUID g;
146
    ByteIOContext *pb = &s->pb;
147
    AVStream *st;
148
    ASFStream *asf_st;
149
    int size, i;
150
    int64_t gsize;
151

    
152
    get_guid(pb, &g);
153
    if (memcmp(&g, &asf_header, sizeof(GUID)))
154
        goto fail;
155
    get_le64(pb);
156
    get_le32(pb);
157
    get_byte(pb);
158
    get_byte(pb);
159
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
160
    for(;;) {
161
        get_guid(pb, &g);
162
        gsize = get_le64(pb);
163
#ifdef DEBUG
164
        printf("%08Lx: ", url_ftell(pb) - 24);
165
        print_guid(&g);
166
        printf("  size=0x%Lx\n", gsize);
167
#endif
168
        if (gsize < 24)
169
            goto fail;
170
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
171
            get_guid(pb, &asf->hdr.guid);
172
            asf->hdr.file_size          = get_le64(pb);
173
            asf->hdr.create_time        = get_le64(pb);
174
            asf->hdr.packets_count      = get_le64(pb);
175
            asf->hdr.send_time          = get_le64(pb);
176
            asf->hdr.play_time          = get_le64(pb);
177
            asf->hdr.preroll            = get_le32(pb);
178
            asf->hdr.ignore             = get_le32(pb);
179
            asf->hdr.flags              = get_le32(pb);
180
            asf->hdr.min_pktsize        = get_le32(pb);
181
            asf->hdr.max_pktsize        = get_le32(pb);
182
            asf->hdr.max_bitrate        = get_le32(pb);
183
            asf->packet_size = asf->hdr.max_pktsize;
184
            asf->nb_packets = asf->hdr.packets_count;
185
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
186
            int type, total_size, type_specific_size, sizeX;
187
            unsigned int tag1;
188
            int64_t pos1, pos2;
189

    
190
            pos1 = url_ftell(pb);
191

    
192
            st = av_new_stream(s, 0);
193
            if (!st)
194
                goto fail;
195
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
196
            asf_st = av_mallocz(sizeof(ASFStream));
197
            if (!asf_st)
198
                goto fail;
199
            st->priv_data = asf_st;
200
            st->start_time = asf->hdr.preroll;
201
            st->duration = asf->hdr.send_time /
202
                (10000000 / 1000) - st->start_time;
203
            get_guid(pb, &g);
204
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
205
                type = CODEC_TYPE_AUDIO;
206
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
207
                type = CODEC_TYPE_VIDEO;
208
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
209
                type = CODEC_TYPE_UNKNOWN;
210
            } else {
211
                goto fail;
212
            }
213
            get_guid(pb, &g);
214
            total_size = get_le64(pb);
215
            type_specific_size = get_le32(pb);
216
            get_le32(pb);
217
            st->id = get_le16(pb) & 0x7f; /* stream id */
218
            // mapping of asf ID to AV stream ID;
219
            asf->asfid2avid[st->id] = s->nb_streams - 1;
220

    
221
            get_le32(pb);
222
            st->codec->codec_type = type;
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
                sizeX= 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
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
276
                size= sizeX;
277
                if (size > 40) {
278
                    st->codec->extradata_size = size - 40;
279
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
280
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
281
                }
282

    
283
        /* Extract palette from extradata if bpp <= 8 */
284
        /* This code assumes that extradata contains only palette */
285
        /* This is true for all paletted codecs implemented in ffmpeg */
286
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
287
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
288
#ifdef WORDS_BIGENDIAN
289
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
290
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
291
#else
292
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
293
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
294
#endif
295
            st->codec->palctrl->palette_changed = 1;
296
        }
297

    
298
                st->codec->codec_tag = tag1;
299
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
300
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
301
                    st->need_parsing = 1;
302
            }
303
            pos2 = url_ftell(pb);
304
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
305
        } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
306
            break;
307
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
308
            int len1, len2, len3, len4, len5;
309

    
310
            len1 = get_le16(pb);
311
            len2 = get_le16(pb);
312
            len3 = get_le16(pb);
313
            len4 = get_le16(pb);
314
            len5 = get_le16(pb);
315
            get_str16_nolen(pb, len1, s->title, sizeof(s->title));
316
            get_str16_nolen(pb, len2, s->author, sizeof(s->author));
317
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
318
            get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
319
            url_fskip(pb, len5);
320
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
321
                int desc_count, i;
322

    
323
                desc_count = get_le16(pb);
324
                for(i=0;i<desc_count;i++)
325
                {
326
                        int name_len,value_type,value_len,value_num = 0;
327
                        char *name, *value;
328

    
329
                        name_len = get_le16(pb);
330
                        name = (char *)av_mallocz(name_len);
331
                        get_str16_nolen(pb, name_len, name, name_len);
332
                        value_type = get_le16(pb);
333
                        value_len = get_le16(pb);
334
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
335
                        {
336
                                value = (char *)av_mallocz(value_len);
337
                                get_str16_nolen(pb, value_len, value, value_len);
338
                                if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
339
                                av_free(value);
340
                        }
341
                        if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
342
                        {
343
                                if (value_type==2) value_num = get_le32(pb);
344
                                if (value_type==3) value_num = get_le32(pb);
345
                                if (value_type==4) value_num = get_le64(pb);
346
                                if (value_type==5) value_num = get_le16(pb);
347
                                if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
348
                                if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
349
                        }
350
                        av_free(name);
351
                }
352
#if 0
353
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
354
            int v1, v2;
355
            get_guid(pb, &g);
356
            v1 = get_le32(pb);
357
            v2 = get_le16(pb);
358
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
359
            int len, v1, n, num;
360
            char str[256], *q;
361
            char tag[16];
362

363
            get_guid(pb, &g);
364
            print_guid(&g);
365

366
            n = get_le32(pb);
367
            for(i=0;i<n;i++) {
368
                num = get_le16(pb); /* stream number */
369
                get_str16(pb, str, sizeof(str));
370
                get_str16(pb, str, sizeof(str));
371
                len = get_le16(pb);
372
                q = tag;
373
                while (len > 0) {
374
                    v1 = get_byte(pb);
375
                    if ((q - tag) < sizeof(tag) - 1)
376
                        *q++ = v1;
377
                    len--;
378
                }
379
                *q = '\0';
380
            }
381
#endif
382
        } else if (url_feof(pb)) {
383
            goto fail;
384
        } else {
385
            url_fseek(pb, gsize - 24, SEEK_CUR);
386
        }
387
    }
388
    get_guid(pb, &g);
389
    get_le64(pb);
390
    get_byte(pb);
391
    get_byte(pb);
392
    if (url_feof(pb))
393
        goto fail;
394
    asf->data_offset = url_ftell(pb);
395
    asf->packet_size_left = 0;
396

    
397
    return 0;
398

    
399
 fail:
400
     for(i=0;i<s->nb_streams;i++) {
401
        AVStream *st = s->streams[i];
402
        if (st) {
403
            av_free(st->priv_data);
404
            av_free(st->codec->extradata);
405
        }
406
        av_free(st);
407
    }
408
    return -1;
409
}
410

    
411
#define DO_2BITS(bits, var, defval) \
412
    switch (bits & 3) \
413
    { \
414
    case 3: var = get_le32(pb); rsize += 4; break; \
415
    case 2: var = get_le16(pb); rsize += 2; break; \
416
    case 1: var = get_byte(pb); rsize++; break; \
417
    default: var = defval; break; \
418
    }
419

    
420
static int asf_get_packet(AVFormatContext *s)
421
{
422
    ASFContext *asf = s->priv_data;
423
    ByteIOContext *pb = &s->pb;
424
    uint32_t packet_length, padsize;
425
    int rsize = 9;
426
    int c;
427

    
428
    assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
429

    
430
    c = get_byte(pb);
431
    if (c != 0x82) {
432
        if (!url_feof(pb))
433
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
434
    }
435
    if ((c & 0x0f) == 2) { // always true for now
436
        if (get_le16(pb) != 0) {
437
            if (!url_feof(pb))
438
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
439
            return AVERROR_IO;
440
        }
441
        rsize+=2;
442
/*    }else{
443
        if (!url_feof(pb))
444
            printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
445
        return AVERROR_IO;*/
446
    }
447

    
448
    asf->packet_flags = get_byte(pb);
449
    asf->packet_property = get_byte(pb);
450

    
451
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
452
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
453
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
454

    
455
    asf->packet_timestamp = get_le32(pb);
456
    get_le16(pb); /* duration */
457
    // rsize has at least 11 bytes which have to be present
458

    
459
    if (asf->packet_flags & 0x01) {
460
        asf->packet_segsizetype = get_byte(pb); rsize++;
461
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
462
    } else {
463
        asf->packet_segments = 1;
464
        asf->packet_segsizetype = 0x80;
465
    }
466
    asf->packet_size_left = packet_length - padsize - rsize;
467
    if (packet_length < asf->hdr.min_pktsize)
468
        padsize += asf->hdr.min_pktsize - packet_length;
469
    asf->packet_padsize = padsize;
470
#ifdef DEBUG
471
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
472
#endif
473
    return 0;
474
}
475

    
476
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
477
{
478
    ASFContext *asf = s->priv_data;
479
    ASFStream *asf_st = 0;
480
    ByteIOContext *pb = &s->pb;
481
    //static int pc = 0;
482
    for (;;) {
483
        int rsize = 0;
484
        if (asf->packet_size_left < FRAME_HEADER_SIZE
485
            || asf->packet_segments < 1) {
486
            //asf->packet_size_left <= asf->packet_padsize) {
487
            int ret = asf->packet_size_left + asf->packet_padsize;
488
            //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
489
            if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
490
                ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
491
            /* fail safe */
492
            url_fskip(pb, ret);
493
            asf->packet_pos= url_ftell(&s->pb);
494
            ret = asf_get_packet(s);
495
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
496
            if (ret < 0 || url_feof(pb))
497
                return AVERROR_IO;
498
            asf->packet_time_start = 0;
499
            continue;
500
        }
501
        if (asf->packet_time_start == 0) {
502
            /* read frame header */
503
            int num = get_byte(pb);
504
            asf->packet_segments--;
505
            rsize++;
506
            asf->packet_key_frame = (num & 0x80) >> 7;
507
            asf->stream_index = asf->asfid2avid[num & 0x7f];
508
            // sequence should be ignored!
509
            DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
510
            DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
511
            DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
512
//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);
513
            if (asf->packet_replic_size > 1) {
514
                assert(asf->packet_replic_size >= 8);
515
                // it should be always at least 8 bytes - FIXME validate
516
                asf->packet_obj_size = get_le32(pb);
517
                asf->packet_frag_timestamp = get_le32(pb); // timestamp
518
                if (asf->packet_replic_size > 8)
519
                    url_fskip(pb, asf->packet_replic_size - 8);
520
                rsize += asf->packet_replic_size; // FIXME - check validity
521
            } else if (asf->packet_replic_size==1){
522
                // multipacket - frag_offset is begining timestamp
523
                asf->packet_time_start = asf->packet_frag_offset;
524
                asf->packet_frag_offset = 0;
525
                asf->packet_frag_timestamp = asf->packet_timestamp;
526

    
527
                asf->packet_time_delta = get_byte(pb);
528
                rsize++;
529
            }else{
530
                assert(asf->packet_replic_size==0);
531
            }
532
            if (asf->packet_flags & 0x01) {
533
                DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
534
#undef DO_2BITS
535
                //printf("Fragsize %d\n", asf->packet_frag_size);
536
            } else {
537
                asf->packet_frag_size = asf->packet_size_left - rsize;
538
                //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
539
            }
540
            if (asf->packet_replic_size == 1) {
541
                asf->packet_multi_size = asf->packet_frag_size;
542
                if (asf->packet_multi_size > asf->packet_size_left) {
543
                    asf->packet_segments = 0;
544
                    continue;
545
                }
546
            }
547
            asf->packet_size_left -= rsize;
548
            //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
549

    
550
            if (asf->stream_index < 0
551
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
552
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
553
                ) {
554
                asf->packet_time_start = 0;
555
                /* unhandled packet (should not happen) */
556
                url_fskip(pb, asf->packet_frag_size);
557
                asf->packet_size_left -= asf->packet_frag_size;
558
                if(asf->stream_index < 0)
559
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
560
                continue;
561
            }
562
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
563
        }
564
        asf_st = asf->asf_st;
565

    
566
        if ((asf->packet_frag_offset != asf_st->frag_offset
567
             || (asf->packet_frag_offset
568
                 && asf->packet_seq != asf_st->seq)) // seq should be ignored
569
           ) {
570
            /* cannot continue current packet: free it */
571
            // FIXME better check if packet was already allocated
572
            av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
573
                   asf_st->pkt.size,
574
                   asf->packet_obj_size,
575
                   asf->packet_frag_offset, asf_st->frag_offset,
576
                   asf->packet_seq, asf_st->seq, asf->packet_frag_size);
577
            if (asf_st->pkt.size)
578
                av_free_packet(&asf_st->pkt);
579
            asf_st->frag_offset = 0;
580
            if (asf->packet_frag_offset != 0) {
581
                url_fskip(pb, asf->packet_frag_size);
582
                av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
583
                asf->packet_size_left -= asf->packet_frag_size;
584
                continue;
585
            }
586
        }
587
        if (asf->packet_replic_size == 1) {
588
            // frag_offset is here used as the begining timestamp
589
            asf->packet_frag_timestamp = asf->packet_time_start;
590
            asf->packet_time_start += asf->packet_time_delta;
591
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
592
            asf->packet_size_left--;
593
            asf->packet_multi_size--;
594
            if (asf->packet_multi_size < asf->packet_obj_size)
595
            {
596
                asf->packet_time_start = 0;
597
                url_fskip(pb, asf->packet_multi_size);
598
                asf->packet_size_left -= asf->packet_multi_size;
599
                continue;
600
            }
601
            asf->packet_multi_size -= asf->packet_obj_size;
602
            //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);
603
        }
604
        if (asf_st->frag_offset == 0) {
605
            /* new packet */
606
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
607
            asf_st->seq = asf->packet_seq;
608
            asf_st->pkt.pts = asf->packet_frag_timestamp;
609
            asf_st->pkt.stream_index = asf->stream_index;
610
            asf_st->pkt.pos =
611
            asf_st->packet_pos= asf->packet_pos;
612
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
613
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
614
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
615
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
616
                asf->packet_key_frame = 1;
617
            if (asf->packet_key_frame)
618
                asf_st->pkt.flags |= PKT_FLAG_KEY;
619
        }
620

    
621
        /* read data */
622
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
623
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
624
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
625
        asf->packet_size_left -= asf->packet_frag_size;
626
        if (asf->packet_size_left < 0)
627
            continue;
628
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
629
                   asf->packet_frag_size);
630
        asf_st->frag_offset += asf->packet_frag_size;
631
        /* test if whole packet is read */
632
        if (asf_st->frag_offset == asf_st->pkt.size) {
633
            /* return packet */
634
            if (asf_st->ds_span > 1) {
635
                /* packet descrambling */
636
                char* newdata = av_malloc(asf_st->pkt.size);
637
                if (newdata) {
638
                    int offset = 0;
639
                    while (offset < asf_st->pkt.size) {
640
                        int off = offset / asf_st->ds_chunk_size;
641
                        int row = off / asf_st->ds_span;
642
                        int col = off % asf_st->ds_span;
643
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
644
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
645
                        memcpy(newdata + offset,
646
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
647
                               asf_st->ds_chunk_size);
648
                        offset += asf_st->ds_chunk_size;
649
                    }
650
                    av_free(asf_st->pkt.data);
651
                    asf_st->pkt.data = newdata;
652
                }
653
            }
654
            asf_st->frag_offset = 0;
655
            memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
656
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
657
            asf_st->pkt.size = 0;
658
            asf_st->pkt.data = 0;
659
            break; // packet completed
660
        }
661
    }
662
    return 0;
663
}
664

    
665
static int asf_read_close(AVFormatContext *s)
666
{
667
    int i;
668

    
669
    for(i=0;i<s->nb_streams;i++) {
670
        AVStream *st = s->streams[i];
671
        av_free(st->priv_data);
672
        av_free(st->codec->extradata);
673
    av_free(st->codec->palctrl);
674
    }
675
    return 0;
676
}
677

    
678
// Added to support seeking after packets have been read
679
// If information is not reset, read_packet fails due to
680
// leftover information from previous reads
681
static void asf_reset_header(AVFormatContext *s)
682
{
683
    ASFContext *asf = s->priv_data;
684
    ASFStream *asf_st;
685
    int i;
686

    
687
    asf->packet_nb_frames = 0;
688
    asf->packet_timestamp_start = -1;
689
    asf->packet_timestamp_end = -1;
690
    asf->packet_size_left = 0;
691
    asf->packet_segments = 0;
692
    asf->packet_flags = 0;
693
    asf->packet_property = 0;
694
    asf->packet_timestamp = 0;
695
    asf->packet_segsizetype = 0;
696
    asf->packet_segments = 0;
697
    asf->packet_seq = 0;
698
    asf->packet_replic_size = 0;
699
    asf->packet_key_frame = 0;
700
    asf->packet_padsize = 0;
701
    asf->packet_frag_offset = 0;
702
    asf->packet_frag_size = 0;
703
    asf->packet_frag_timestamp = 0;
704
    asf->packet_multi_size = 0;
705
    asf->packet_obj_size = 0;
706
    asf->packet_time_delta = 0;
707
    asf->packet_time_start = 0;
708

    
709
    for(i=0; i<s->nb_streams; i++){
710
        asf_st= s->streams[i]->priv_data;
711
        av_free_packet(&asf_st->pkt);
712
        asf_st->frag_offset=0;
713
        asf_st->seq=0;
714
    }
715
    asf->asf_st= NULL;
716
}
717

    
718
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
719
{
720
    ASFContext *asf = s->priv_data;
721
    AVPacket pkt1, *pkt = &pkt1;
722
    ASFStream *asf_st;
723
    int64_t pts;
724
    int64_t pos= *ppos;
725
    int i;
726
    int64_t start_pos[s->nb_streams];
727

    
728
    for(i=0; i<s->nb_streams; i++){
729
        start_pos[i]= pos;
730
    }
731

    
732
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
733
    *ppos= pos;
734
    url_fseek(&s->pb, pos, SEEK_SET);
735

    
736
//printf("asf_read_pts\n");
737
    asf_reset_header(s);
738
    for(;;){
739
        if (av_read_frame(s, pkt) < 0){
740
            av_log(s, AV_LOG_INFO, "seek failed\n");
741
            return AV_NOPTS_VALUE;
742
        }
743

    
744
        pts= pkt->pts * 1000 / AV_TIME_BASE;
745

    
746
        av_free_packet(pkt);
747
        if(pkt->flags&PKT_FLAG_KEY){
748
            i= pkt->stream_index;
749

    
750
            asf_st= s->streams[i]->priv_data;
751

    
752
            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
753
            pos= asf_st->packet_pos;
754

    
755
            av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
756
            start_pos[i]= asf_st->packet_pos + 1;
757

    
758
            if(pkt->stream_index == stream_index)
759
               break;
760
        }
761
    }
762

    
763
    *ppos= pos;
764
//printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
765

    
766
    return pts;
767
}
768

    
769
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
770
{
771
    ASFContext *asf = s->priv_data;
772

    
773
    if (asf->packet_size <= 0)
774
        return -1;
775

    
776
    if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
777
        return -1;
778

    
779
    asf_reset_header(s);
780
    return 0;
781
}
782

    
783
static AVInputFormat asf_iformat = {
784
    "asf",
785
    "asf format",
786
    sizeof(ASFContext),
787
    asf_probe,
788
    asf_read_header,
789
    asf_read_packet,
790
    asf_read_close,
791
    asf_read_seek,
792
    asf_read_pts,
793
};
794

    
795
#ifdef CONFIG_MUXERS
796
    extern AVOutputFormat asf_oformat;
797
    extern AVOutputFormat asf_stream_oformat;
798
#endif //CONFIG_MUXERS
799

    
800
int asf_init(void)
801
{
802
    av_register_input_format(&asf_iformat);
803
#ifdef CONFIG_MUXERS
804
    av_register_output_format(&asf_oformat);
805
    av_register_output_format(&asf_stream_oformat);
806
#endif //CONFIG_MUXERS
807
    return 0;
808
}