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ffmpeg / libavformat / asf.c @ a5e9102b

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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 PRINT_IF_GUID(g, ext_stream_header);
64
    else PRINT_IF_GUID(g, extended_content_header);
65
    else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
66
    else PRINT_IF_GUID(g, ext_stream_audio_stream);
67
    else
68
        printf("(GUID: unknown) ");
69
    printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
70
    for(i=0;i<8;i++)
71
        printf(" 0x%02x,", g->v4[i]);
72
    printf("}\n");
73
}
74
#undef PRINT_IF_GUID
75
#endif
76

    
77
static void get_guid(ByteIOContext *s, GUID *g)
78
{
79
    int i;
80

    
81
    g->v1 = get_le32(s);
82
    g->v2 = get_le16(s);
83
    g->v3 = get_le16(s);
84
    for(i=0;i<8;i++)
85
        g->v4[i] = get_byte(s);
86
}
87

    
88
#if 0
89
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
90
{
91
    int len, c;
92
    char *q;
93

94
    len = get_le16(pb);
95
    q = buf;
96
    while (len > 0) {
97
        c = get_le16(pb);
98
        if ((q - buf) < buf_size - 1)
99
            *q++ = c;
100
        len--;
101
    }
102
    *q = '\0';
103
}
104
#endif
105

    
106
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
107
{
108
    int c;
109
    char *q;
110

    
111
    q = buf;
112
    while (len > 0) {
113
        c = get_le16(pb);
114
        if ((q - buf) < buf_size - 1)
115
            *q++ = c;
116
        len-=2;
117
    }
118
    *q = '\0';
119
}
120

    
121
static int asf_probe(AVProbeData *pd)
122
{
123
    GUID g;
124
    const unsigned char *p;
125
    int i;
126

    
127
    /* check file header */
128
    if (pd->buf_size <= 32)
129
        return 0;
130
    p = pd->buf;
131
    g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
132
    p += 4;
133
    g.v2 = p[0] | (p[1] << 8);
134
    p += 2;
135
    g.v3 = p[0] | (p[1] << 8);
136
    p += 2;
137
    for(i=0;i<8;i++)
138
        g.v4[i] = *p++;
139

    
140
    if (!memcmp(&g, &asf_header, sizeof(GUID)))
141
        return AVPROBE_SCORE_MAX;
142
    else
143
        return 0;
144
}
145

    
146
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
147
{
148
    ASFContext *asf = s->priv_data;
149
    GUID g;
150
    ByteIOContext *pb = &s->pb;
151
    AVStream *st;
152
    ASFStream *asf_st;
153
    int size, i;
154
    int64_t gsize;
155

    
156
    get_guid(pb, &g);
157
    if (memcmp(&g, &asf_header, sizeof(GUID)))
158
        goto fail;
159
    get_le64(pb);
160
    get_le32(pb);
161
    get_byte(pb);
162
    get_byte(pb);
163
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
164
    for(;;) {
165
        get_guid(pb, &g);
166
        gsize = get_le64(pb);
167
#ifdef DEBUG
168
        printf("%08Lx: ", url_ftell(pb) - 24);
169
        print_guid(&g);
170
        printf("  size=0x%Lx\n", gsize);
171
#endif
172
        if (gsize < 24)
173
            goto fail;
174
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
175
            get_guid(pb, &asf->hdr.guid);
176
            asf->hdr.file_size          = get_le64(pb);
177
            asf->hdr.create_time        = get_le64(pb);
178
            asf->hdr.packets_count      = get_le64(pb);
179
            asf->hdr.send_time          = get_le64(pb);
180
            asf->hdr.play_time          = get_le64(pb);
181
            asf->hdr.preroll            = get_le32(pb);
182
            asf->hdr.ignore             = get_le32(pb);
183
            asf->hdr.flags              = get_le32(pb);
184
            asf->hdr.min_pktsize        = get_le32(pb);
185
            asf->hdr.max_pktsize        = get_le32(pb);
186
            asf->hdr.max_bitrate        = get_le32(pb);
187
            asf->packet_size = asf->hdr.max_pktsize;
188
            asf->nb_packets = asf->hdr.packets_count;
189
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
190
            int type, total_size, type_specific_size, sizeX;
191
            unsigned int tag1;
192
            int64_t pos1, pos2;
193
            int test_for_ext_stream_audio;
194

    
195
            pos1 = url_ftell(pb);
196

    
197
            st = av_new_stream(s, 0);
198
            if (!st)
199
                goto fail;
200
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
201
            asf_st = av_mallocz(sizeof(ASFStream));
202
            if (!asf_st)
203
                goto fail;
204
            st->priv_data = asf_st;
205
            st->start_time = asf->hdr.preroll;
206
            st->duration = asf->hdr.send_time /
207
                (10000000 / 1000) - st->start_time;
208
            get_guid(pb, &g);
209

    
210
            test_for_ext_stream_audio = 0;
211
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
212
                type = CODEC_TYPE_AUDIO;
213
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
214
                type = CODEC_TYPE_VIDEO;
215
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
216
                type = CODEC_TYPE_UNKNOWN;
217
            } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
218
                test_for_ext_stream_audio = 1;
219
                type = CODEC_TYPE_UNKNOWN;
220
            } else {
221
                goto fail;
222
            }
223
            get_guid(pb, &g);
224
            total_size = get_le64(pb);
225
            type_specific_size = get_le32(pb);
226
            get_le32(pb);
227
            st->id = get_le16(pb) & 0x7f; /* stream id */
228
            // mapping of asf ID to AV stream ID;
229
            asf->asfid2avid[st->id] = s->nb_streams - 1;
230

    
231
            get_le32(pb);
232

    
233
            if (test_for_ext_stream_audio) {
234
                get_guid(pb, &g);
235
                if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
236
                    type = CODEC_TYPE_AUDIO;
237
                    get_guid(pb, &g);
238
                    get_le32(pb);
239
                    get_le32(pb);
240
                    get_le32(pb);
241
                    get_guid(pb, &g);
242
                    get_le32(pb);
243
                }
244
            }
245

    
246
            st->codec->codec_type = type;
247
            if (type == CODEC_TYPE_AUDIO) {
248
                get_wav_header(pb, st->codec, type_specific_size);
249
                st->need_parsing = 1;
250
                /* We have to init the frame size at some point .... */
251
                pos2 = url_ftell(pb);
252
                if (gsize > (pos2 + 8 - pos1 + 24)) {
253
                    asf_st->ds_span = get_byte(pb);
254
                    asf_st->ds_packet_size = get_le16(pb);
255
                    asf_st->ds_chunk_size = get_le16(pb);
256
                    asf_st->ds_data_size = get_le16(pb);
257
                    asf_st->ds_silence_data = get_byte(pb);
258
                }
259
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
260
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
261
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
262
                if (asf_st->ds_span > 1) {
263
                    if (!asf_st->ds_chunk_size
264
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
265
                        asf_st->ds_span = 0; // disable descrambling
266
                }
267
                switch (st->codec->codec_id) {
268
                case CODEC_ID_MP3:
269
                    st->codec->frame_size = MPA_FRAME_SIZE;
270
                    break;
271
                case CODEC_ID_PCM_S16LE:
272
                case CODEC_ID_PCM_S16BE:
273
                case CODEC_ID_PCM_U16LE:
274
                case CODEC_ID_PCM_U16BE:
275
                case CODEC_ID_PCM_S8:
276
                case CODEC_ID_PCM_U8:
277
                case CODEC_ID_PCM_ALAW:
278
                case CODEC_ID_PCM_MULAW:
279
                    st->codec->frame_size = 1;
280
                    break;
281
                default:
282
                    /* This is probably wrong, but it prevents a crash later */
283
                    st->codec->frame_size = 1;
284
                    break;
285
                }
286
            } else if (type == CODEC_TYPE_VIDEO) {
287
                get_le32(pb);
288
                get_le32(pb);
289
                get_byte(pb);
290
                size = get_le16(pb); /* size */
291
                sizeX= get_le32(pb); /* size */
292
                st->codec->width = get_le32(pb);
293
                st->codec->height = get_le32(pb);
294
                /* not available for asf */
295
                get_le16(pb); /* panes */
296
                st->codec->bits_per_sample = get_le16(pb); /* depth */
297
                tag1 = get_le32(pb);
298
                url_fskip(pb, 20);
299
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
300
                size= sizeX;
301
                if (size > 40) {
302
                    st->codec->extradata_size = size - 40;
303
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
304
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
305
                }
306

    
307
        /* Extract palette from extradata if bpp <= 8 */
308
        /* This code assumes that extradata contains only palette */
309
        /* This is true for all paletted codecs implemented in ffmpeg */
310
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
311
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
312
#ifdef WORDS_BIGENDIAN
313
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
314
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
315
#else
316
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
317
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
318
#endif
319
            st->codec->palctrl->palette_changed = 1;
320
        }
321

    
322
                st->codec->codec_tag = tag1;
323
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
324
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
325
                    st->need_parsing = 1;
326
            }
327
            pos2 = url_ftell(pb);
328
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
329
        } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
330
            break;
331
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
332
            int len1, len2, len3, len4, len5;
333

    
334
            len1 = get_le16(pb);
335
            len2 = get_le16(pb);
336
            len3 = get_le16(pb);
337
            len4 = get_le16(pb);
338
            len5 = get_le16(pb);
339
            get_str16_nolen(pb, len1, s->title, sizeof(s->title));
340
            get_str16_nolen(pb, len2, s->author, sizeof(s->author));
341
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
342
            get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
343
            url_fskip(pb, len5);
344
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
345
                int desc_count, i;
346

    
347
                desc_count = get_le16(pb);
348
                for(i=0;i<desc_count;i++)
349
                {
350
                        int name_len,value_type,value_len,value_num = 0;
351
                        char *name, *value;
352

    
353
                        name_len = get_le16(pb);
354
                        name = (char *)av_mallocz(name_len);
355
                        get_str16_nolen(pb, name_len, name, name_len);
356
                        value_type = get_le16(pb);
357
                        value_len = get_le16(pb);
358
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
359
                        {
360
                                value = (char *)av_mallocz(value_len);
361
                                get_str16_nolen(pb, value_len, value, value_len);
362
                                if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
363
                                av_free(value);
364
                        }
365
                        if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
366
                        {
367
                                if (value_type==2) value_num = get_le32(pb);
368
                                if (value_type==3) value_num = get_le32(pb);
369
                                if (value_type==4) value_num = get_le64(pb);
370
                                if (value_type==5) value_num = get_le16(pb);
371
                                if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
372
                                if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
373
                        }
374
                        av_free(name);
375
                }
376
        } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
377
            int ext_len, payload_ext_ct, stream_ct;
378
            uint32_t ext_d;
379
            int64_t pos_ex_st;
380
            pos_ex_st = url_ftell(pb);
381

    
382
            get_le64(pb);
383
            get_le64(pb);
384
            get_le32(pb);
385
            get_le32(pb);
386
            get_le32(pb);
387
            get_le32(pb);
388
            get_le32(pb);
389
            get_le32(pb);
390
            get_le32(pb);
391
            get_le32(pb);
392
            get_le16(pb);
393
            get_le16(pb);
394
            get_le64(pb);
395
            stream_ct = get_le16(pb);
396
            payload_ext_ct = get_le16(pb);
397

    
398
            for (i=0; i<stream_ct; i++){
399
                get_le16(pb);
400
                ext_len = get_le16(pb);
401
                url_fseek(pb, ext_len, SEEK_CUR);
402
            }
403

    
404
            for (i=0; i<payload_ext_ct; i++){
405
                get_guid(pb, &g);
406
                ext_d=get_le16(pb);
407
                ext_len=get_le32(pb);
408
                url_fseek(pb, ext_len, SEEK_CUR);
409
            }
410

    
411
            // there could be a optional stream properties object to follow
412
            // if so the next iteration will pick it up
413
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
414
            int v1, v2;
415
            get_guid(pb, &g);
416
            v1 = get_le32(pb);
417
            v2 = get_le16(pb);
418
#if 0
419
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
420
            int len, v1, n, num;
421
            char str[256], *q;
422
            char tag[16];
423

424
            get_guid(pb, &g);
425
            print_guid(&g);
426

427
            n = get_le32(pb);
428
            for(i=0;i<n;i++) {
429
                num = get_le16(pb); /* stream number */
430
                get_str16(pb, str, sizeof(str));
431
                get_str16(pb, str, sizeof(str));
432
                len = get_le16(pb);
433
                q = tag;
434
                while (len > 0) {
435
                    v1 = get_byte(pb);
436
                    if ((q - tag) < sizeof(tag) - 1)
437
                        *q++ = v1;
438
                    len--;
439
                }
440
                *q = '\0';
441
            }
442
#endif
443
        } else if (url_feof(pb)) {
444
            goto fail;
445
        } else {
446
            url_fseek(pb, gsize - 24, SEEK_CUR);
447
        }
448
    }
449
    get_guid(pb, &g);
450
    get_le64(pb);
451
    get_byte(pb);
452
    get_byte(pb);
453
    if (url_feof(pb))
454
        goto fail;
455
    asf->data_offset = url_ftell(pb);
456
    asf->packet_size_left = 0;
457

    
458
    return 0;
459

    
460
 fail:
461
     for(i=0;i<s->nb_streams;i++) {
462
        AVStream *st = s->streams[i];
463
        if (st) {
464
            av_free(st->priv_data);
465
            av_free(st->codec->extradata);
466
        }
467
        av_free(st);
468
    }
469
    return -1;
470
}
471

    
472
#define DO_2BITS(bits, var, defval) \
473
    switch (bits & 3) \
474
    { \
475
    case 3: var = get_le32(pb); rsize += 4; break; \
476
    case 2: var = get_le16(pb); rsize += 2; break; \
477
    case 1: var = get_byte(pb); rsize++; break; \
478
    default: var = defval; break; \
479
    }
480

    
481
static int asf_get_packet(AVFormatContext *s)
482
{
483
    ASFContext *asf = s->priv_data;
484
    ByteIOContext *pb = &s->pb;
485
    uint32_t packet_length, padsize;
486
    int rsize = 9;
487
    int c;
488

    
489
    assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
490

    
491
    c = get_byte(pb);
492
    if (c != 0x82) {
493
        if (!url_feof(pb))
494
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
495
    }
496
    if ((c & 0x0f) == 2) { // always true for now
497
        if (get_le16(pb) != 0) {
498
            if (!url_feof(pb))
499
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
500
            return AVERROR_IO;
501
        }
502
        rsize+=2;
503
/*    }else{
504
        if (!url_feof(pb))
505
            printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
506
        return AVERROR_IO;*/
507
    }
508

    
509
    asf->packet_flags = get_byte(pb);
510
    asf->packet_property = get_byte(pb);
511

    
512
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
513
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
514
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
515

    
516
    asf->packet_timestamp = get_le32(pb);
517
    get_le16(pb); /* duration */
518
    // rsize has at least 11 bytes which have to be present
519

    
520
    if (asf->packet_flags & 0x01) {
521
        asf->packet_segsizetype = get_byte(pb); rsize++;
522
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
523
    } else {
524
        asf->packet_segments = 1;
525
        asf->packet_segsizetype = 0x80;
526
    }
527
    asf->packet_size_left = packet_length - padsize - rsize;
528
    if (packet_length < asf->hdr.min_pktsize)
529
        padsize += asf->hdr.min_pktsize - packet_length;
530
    asf->packet_padsize = padsize;
531
#ifdef DEBUG
532
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
533
#endif
534
    return 0;
535
}
536

    
537
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
538
{
539
    ASFContext *asf = s->priv_data;
540
    ASFStream *asf_st = 0;
541
    ByteIOContext *pb = &s->pb;
542
    //static int pc = 0;
543
    for (;;) {
544
        int rsize = 0;
545
        if (asf->packet_size_left < FRAME_HEADER_SIZE
546
            || asf->packet_segments < 1) {
547
            //asf->packet_size_left <= asf->packet_padsize) {
548
            int ret = asf->packet_size_left + asf->packet_padsize;
549
            //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
550
            if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
551
                ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
552
            /* fail safe */
553
            url_fskip(pb, ret);
554
            asf->packet_pos= url_ftell(&s->pb);
555
            ret = asf_get_packet(s);
556
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
557
            if (ret < 0 || url_feof(pb))
558
                return AVERROR_IO;
559
            asf->packet_time_start = 0;
560
            continue;
561
        }
562
        if (asf->packet_time_start == 0) {
563
            /* read frame header */
564
            int num = get_byte(pb);
565
            asf->packet_segments--;
566
            rsize++;
567
            asf->packet_key_frame = (num & 0x80) >> 7;
568
            asf->stream_index = asf->asfid2avid[num & 0x7f];
569
            // sequence should be ignored!
570
            DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
571
            DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
572
            DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
573
//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);
574
            if (asf->packet_replic_size > 1) {
575
                assert(asf->packet_replic_size >= 8);
576
                // it should be always at least 8 bytes - FIXME validate
577
                asf->packet_obj_size = get_le32(pb);
578
                asf->packet_frag_timestamp = get_le32(pb); // timestamp
579
                if (asf->packet_replic_size > 8)
580
                    url_fskip(pb, asf->packet_replic_size - 8);
581
                rsize += asf->packet_replic_size; // FIXME - check validity
582
            } else if (asf->packet_replic_size==1){
583
                // multipacket - frag_offset is begining timestamp
584
                asf->packet_time_start = asf->packet_frag_offset;
585
                asf->packet_frag_offset = 0;
586
                asf->packet_frag_timestamp = asf->packet_timestamp;
587

    
588
                asf->packet_time_delta = get_byte(pb);
589
                rsize++;
590
            }else{
591
                assert(asf->packet_replic_size==0);
592
            }
593
            if (asf->packet_flags & 0x01) {
594
                DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
595
#undef DO_2BITS
596
                //printf("Fragsize %d\n", asf->packet_frag_size);
597
            } else {
598
                asf->packet_frag_size = asf->packet_size_left - rsize;
599
                //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
600
            }
601
            if (asf->packet_replic_size == 1) {
602
                asf->packet_multi_size = asf->packet_frag_size;
603
                if (asf->packet_multi_size > asf->packet_size_left) {
604
                    asf->packet_segments = 0;
605
                    continue;
606
                }
607
            }
608
            asf->packet_size_left -= rsize;
609
            //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
610

    
611
            if (asf->stream_index < 0
612
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
613
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
614
                ) {
615
                asf->packet_time_start = 0;
616
                /* unhandled packet (should not happen) */
617
                url_fskip(pb, asf->packet_frag_size);
618
                asf->packet_size_left -= asf->packet_frag_size;
619
                if(asf->stream_index < 0)
620
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
621
                continue;
622
            }
623
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
624
        }
625
        asf_st = asf->asf_st;
626

    
627
        if ((asf->packet_frag_offset != asf_st->frag_offset
628
             || (asf->packet_frag_offset
629
                 && asf->packet_seq != asf_st->seq)) // seq should be ignored
630
           ) {
631
            /* cannot continue current packet: free it */
632
            // FIXME better check if packet was already allocated
633
            av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
634
                   asf_st->pkt.size,
635
                   asf->packet_obj_size,
636
                   asf->packet_frag_offset, asf_st->frag_offset,
637
                   asf->packet_seq, asf_st->seq, asf->packet_frag_size);
638
            if (asf_st->pkt.size)
639
                av_free_packet(&asf_st->pkt);
640
            asf_st->frag_offset = 0;
641
            if (asf->packet_frag_offset != 0) {
642
                url_fskip(pb, asf->packet_frag_size);
643
                av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
644
                asf->packet_size_left -= asf->packet_frag_size;
645
                continue;
646
            }
647
        }
648
        if (asf->packet_replic_size == 1) {
649
            // frag_offset is here used as the begining timestamp
650
            asf->packet_frag_timestamp = asf->packet_time_start;
651
            asf->packet_time_start += asf->packet_time_delta;
652
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
653
            asf->packet_size_left--;
654
            asf->packet_multi_size--;
655
            if (asf->packet_multi_size < asf->packet_obj_size)
656
            {
657
                asf->packet_time_start = 0;
658
                url_fskip(pb, asf->packet_multi_size);
659
                asf->packet_size_left -= asf->packet_multi_size;
660
                continue;
661
            }
662
            asf->packet_multi_size -= asf->packet_obj_size;
663
            //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);
664
        }
665
        if (asf_st->frag_offset == 0) {
666
            /* new packet */
667
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
668
            asf_st->seq = asf->packet_seq;
669
            asf_st->pkt.pts = asf->packet_frag_timestamp;
670
            asf_st->pkt.stream_index = asf->stream_index;
671
            asf_st->pkt.pos =
672
            asf_st->packet_pos= asf->packet_pos;
673
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
674
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
675
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
676
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
677
                asf->packet_key_frame = 1;
678
            if (asf->packet_key_frame)
679
                asf_st->pkt.flags |= PKT_FLAG_KEY;
680
        }
681

    
682
        /* read data */
683
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
684
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
685
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
686
        asf->packet_size_left -= asf->packet_frag_size;
687
        if (asf->packet_size_left < 0)
688
            continue;
689
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
690
                   asf->packet_frag_size);
691
        asf_st->frag_offset += asf->packet_frag_size;
692
        /* test if whole packet is read */
693
        if (asf_st->frag_offset == asf_st->pkt.size) {
694
            /* return packet */
695
            if (asf_st->ds_span > 1) {
696
                /* packet descrambling */
697
                char* newdata = av_malloc(asf_st->pkt.size);
698
                if (newdata) {
699
                    int offset = 0;
700
                    while (offset < asf_st->pkt.size) {
701
                        int off = offset / asf_st->ds_chunk_size;
702
                        int row = off / asf_st->ds_span;
703
                        int col = off % asf_st->ds_span;
704
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
705
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
706
                        memcpy(newdata + offset,
707
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
708
                               asf_st->ds_chunk_size);
709
                        offset += asf_st->ds_chunk_size;
710
                    }
711
                    av_free(asf_st->pkt.data);
712
                    asf_st->pkt.data = newdata;
713
                }
714
            }
715
            asf_st->frag_offset = 0;
716
            memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
717
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
718
            asf_st->pkt.size = 0;
719
            asf_st->pkt.data = 0;
720
            break; // packet completed
721
        }
722
    }
723
    return 0;
724
}
725

    
726
static int asf_read_close(AVFormatContext *s)
727
{
728
    int i;
729

    
730
    for(i=0;i<s->nb_streams;i++) {
731
        AVStream *st = s->streams[i];
732
        av_free(st->priv_data);
733
    av_free(st->codec->palctrl);
734
    }
735
    return 0;
736
}
737

    
738
// Added to support seeking after packets have been read
739
// If information is not reset, read_packet fails due to
740
// leftover information from previous reads
741
static void asf_reset_header(AVFormatContext *s)
742
{
743
    ASFContext *asf = s->priv_data;
744
    ASFStream *asf_st;
745
    int i;
746

    
747
    asf->packet_nb_frames = 0;
748
    asf->packet_timestamp_start = -1;
749
    asf->packet_timestamp_end = -1;
750
    asf->packet_size_left = 0;
751
    asf->packet_segments = 0;
752
    asf->packet_flags = 0;
753
    asf->packet_property = 0;
754
    asf->packet_timestamp = 0;
755
    asf->packet_segsizetype = 0;
756
    asf->packet_segments = 0;
757
    asf->packet_seq = 0;
758
    asf->packet_replic_size = 0;
759
    asf->packet_key_frame = 0;
760
    asf->packet_padsize = 0;
761
    asf->packet_frag_offset = 0;
762
    asf->packet_frag_size = 0;
763
    asf->packet_frag_timestamp = 0;
764
    asf->packet_multi_size = 0;
765
    asf->packet_obj_size = 0;
766
    asf->packet_time_delta = 0;
767
    asf->packet_time_start = 0;
768

    
769
    for(i=0; i<s->nb_streams; i++){
770
        asf_st= s->streams[i]->priv_data;
771
        av_free_packet(&asf_st->pkt);
772
        asf_st->frag_offset=0;
773
        asf_st->seq=0;
774
    }
775
    asf->asf_st= NULL;
776
}
777

    
778
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
779
{
780
    ASFContext *asf = s->priv_data;
781
    AVPacket pkt1, *pkt = &pkt1;
782
    ASFStream *asf_st;
783
    int64_t pts;
784
    int64_t pos= *ppos;
785
    int i;
786
    int64_t start_pos[s->nb_streams];
787

    
788
    for(i=0; i<s->nb_streams; i++){
789
        start_pos[i]= pos;
790
    }
791

    
792
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
793
    *ppos= pos;
794
    url_fseek(&s->pb, pos, SEEK_SET);
795

    
796
//printf("asf_read_pts\n");
797
    asf_reset_header(s);
798
    for(;;){
799
        if (av_read_frame(s, pkt) < 0){
800
            av_log(s, AV_LOG_INFO, "seek failed\n");
801
            return AV_NOPTS_VALUE;
802
        }
803

    
804
        pts= pkt->pts;
805

    
806
        av_free_packet(pkt);
807
        if(pkt->flags&PKT_FLAG_KEY){
808
            i= pkt->stream_index;
809

    
810
            asf_st= s->streams[i]->priv_data;
811

    
812
            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
813
            pos= asf_st->packet_pos;
814

    
815
            av_add_index_entry(s->streams[i], pos, pkt->size, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
816
            start_pos[i]= asf_st->packet_pos + 1;
817

    
818
            if(pkt->stream_index == stream_index)
819
               break;
820
        }
821
    }
822

    
823
    *ppos= pos;
824
//printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
825

    
826
    return pts;
827
}
828

    
829
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
830
{
831
    ASFContext *asf = s->priv_data;
832

    
833
    if (asf->packet_size <= 0)
834
        return -1;
835

    
836
    if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
837
        return -1;
838

    
839
    asf_reset_header(s);
840
    return 0;
841
}
842

    
843
static AVInputFormat asf_iformat = {
844
    "asf",
845
    "asf format",
846
    sizeof(ASFContext),
847
    asf_probe,
848
    asf_read_header,
849
    asf_read_packet,
850
    asf_read_close,
851
    asf_read_seek,
852
    asf_read_pts,
853
};
854

    
855
#ifdef CONFIG_MUXERS
856
    extern AVOutputFormat asf_oformat;
857
    extern AVOutputFormat asf_stream_oformat;
858
#endif //CONFIG_MUXERS
859

    
860
int asf_init(void)
861
{
862
    av_register_input_format(&asf_iformat);
863
#ifdef CONFIG_MUXERS
864
    av_register_output_format(&asf_oformat);
865
    av_register_output_format(&asf_stream_oformat);
866
#endif //CONFIG_MUXERS
867
    return 0;
868
}