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ffmpeg / libavformat / asf.c @ a836a2c8

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1
/*
2
 * ASF compatible demuxer
3
 * Copyright (c) 2000, 2001 Fabrice Bellard.
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
#include "avformat.h"
22
#include "riff.h"
23
#include "mpegaudio.h"
24
#include "asf.h"
25
#include "common.h"
26

    
27
#undef NDEBUG
28
#include <assert.h>
29

    
30
#define FRAME_HEADER_SIZE 17
31
// Fix Me! FRAME_HEADER_SIZE may be different.
32

    
33
static const GUID index_guid = {
34
    0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
35
};
36

    
37
/**********************************/
38
/* decoding */
39

    
40
//#define DEBUG
41

    
42
#ifdef DEBUG
43
#define PRINT_IF_GUID(g,cmp) \
44
if (!memcmp(g, &cmp, sizeof(GUID))) \
45
    printf("(GUID: %s) ", #cmp)
46

    
47
static void print_guid(const GUID *g)
48
{
49
    int i;
50
    PRINT_IF_GUID(g, asf_header);
51
    else PRINT_IF_GUID(g, file_header);
52
    else PRINT_IF_GUID(g, stream_header);
53
    else PRINT_IF_GUID(g, audio_stream);
54
    else PRINT_IF_GUID(g, audio_conceal_none);
55
    else PRINT_IF_GUID(g, video_stream);
56
    else PRINT_IF_GUID(g, video_conceal_none);
57
    else PRINT_IF_GUID(g, command_stream);
58
    else PRINT_IF_GUID(g, comment_header);
59
    else PRINT_IF_GUID(g, codec_comment_header);
60
    else PRINT_IF_GUID(g, codec_comment1_header);
61
    else PRINT_IF_GUID(g, data_header);
62
    else PRINT_IF_GUID(g, index_guid);
63
    else PRINT_IF_GUID(g, head1_guid);
64
    else PRINT_IF_GUID(g, head2_guid);
65
    else PRINT_IF_GUID(g, my_guid);
66
    else PRINT_IF_GUID(g, ext_stream_header);
67
    else PRINT_IF_GUID(g, extended_content_header);
68
    else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
69
    else PRINT_IF_GUID(g, ext_stream_audio_stream);
70
    else PRINT_IF_GUID(g, metadata_header);
71
    else
72
        printf("(GUID: unknown) ");
73
    for(i=0;i<16;i++)
74
        printf(" 0x%02x,", (*g)[i]);
75
    printf("}\n");
76
}
77
#undef PRINT_IF_GUID
78
#endif
79

    
80
static void get_guid(ByteIOContext *s, GUID *g)
81
{
82
    assert(sizeof(*g) == 16);
83
    get_buffer(s, g, sizeof(*g));
84
}
85

    
86
#if 0
87
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
88
{
89
    int len, c;
90
    char *q;
91

92
    len = get_le16(pb);
93
    q = buf;
94
    while (len > 0) {
95
        c = get_le16(pb);
96
        if ((q - buf) < buf_size - 1)
97
            *q++ = c;
98
        len--;
99
    }
100
    *q = '\0';
101
}
102
#endif
103

    
104
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
105
{
106
    char* q = buf;
107
    len /= 2;
108
    while (len--) {
109
        uint8_t tmp;
110
        PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
111
    }
112
    *q = '\0';
113
}
114

    
115
static int asf_probe(AVProbeData *pd)
116
{
117
    /* check file header */
118
    if (pd->buf_size <= 32)
119
        return 0;
120

    
121
    if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
122
        return AVPROBE_SCORE_MAX;
123
    else
124
        return 0;
125
}
126

    
127
static int get_value(ByteIOContext *pb, int type){
128
    switch(type){
129
        case 2: return get_le32(pb);
130
        case 3: return get_le32(pb);
131
        case 4: return get_le64(pb);
132
        case 5: return get_le16(pb);
133
        default:return INT_MIN;
134
    }
135
}
136

    
137
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
138
{
139
    ASFContext *asf = s->priv_data;
140
    GUID g;
141
    ByteIOContext *pb = &s->pb;
142
    AVStream *st;
143
    ASFStream *asf_st;
144
    int size, i;
145
    int64_t gsize;
146
    AVRational dar[128];
147

    
148
    memset(dar, 0, sizeof(dar));
149

    
150
    get_guid(pb, &g);
151
    if (memcmp(&g, &asf_header, sizeof(GUID)))
152
        goto fail;
153
    get_le64(pb);
154
    get_le32(pb);
155
    get_byte(pb);
156
    get_byte(pb);
157
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
158
    for(;;) {
159
        get_guid(pb, &g);
160
        gsize = get_le64(pb);
161
#ifdef DEBUG
162
        printf("%08"PRIx64": ", url_ftell(pb) - 24);
163
        print_guid(&g);
164
        printf("  size=0x%"PRIx64"\n", gsize);
165
#endif
166
        if (gsize < 24)
167
            goto fail;
168
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
169
            get_guid(pb, &asf->hdr.guid);
170
            asf->hdr.file_size          = get_le64(pb);
171
            asf->hdr.create_time        = get_le64(pb);
172
            asf->nb_packets             = get_le64(pb);
173
            asf->hdr.send_time          = get_le64(pb);
174
            asf->hdr.play_time          = get_le64(pb);
175
            asf->hdr.preroll            = get_le32(pb);
176
            asf->hdr.ignore             = get_le32(pb);
177
            asf->hdr.flags              = get_le32(pb);
178
            asf->hdr.min_pktsize        = get_le32(pb);
179
            asf->hdr.max_pktsize        = get_le32(pb);
180
            asf->hdr.max_bitrate        = get_le32(pb);
181
            asf->packet_size = asf->hdr.max_pktsize;
182
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
183
            int type, type_specific_size, sizeX;
184
            uint64_t total_size;
185
            unsigned int tag1;
186
            int64_t pos1, pos2;
187
            int test_for_ext_stream_audio;
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;
200
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
201
                st->duration = asf->hdr.send_time /
202
                    (10000000 / 1000) - st->start_time;
203
            }
204
            get_guid(pb, &g);
205

    
206
            test_for_ext_stream_audio = 0;
207
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
208
                type = CODEC_TYPE_AUDIO;
209
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
210
                type = CODEC_TYPE_VIDEO;
211
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
212
                type = CODEC_TYPE_UNKNOWN;
213
            } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
214
                test_for_ext_stream_audio = 1;
215
                type = CODEC_TYPE_UNKNOWN;
216
            } else {
217
                goto fail;
218
            }
219
            get_guid(pb, &g);
220
            total_size = get_le64(pb);
221
            type_specific_size = get_le32(pb);
222
            get_le32(pb);
223
            st->id = get_le16(pb) & 0x7f; /* stream id */
224
            // mapping of asf ID to AV stream ID;
225
            asf->asfid2avid[st->id] = s->nb_streams - 1;
226

    
227
            get_le32(pb);
228

    
229
            if (test_for_ext_stream_audio) {
230
                get_guid(pb, &g);
231
                if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
232
                    type = CODEC_TYPE_AUDIO;
233
                    get_guid(pb, &g);
234
                    get_le32(pb);
235
                    get_le32(pb);
236
                    get_le32(pb);
237
                    get_guid(pb, &g);
238
                    get_le32(pb);
239
                }
240
            }
241

    
242
            st->codec->codec_type = type;
243
            if (type == CODEC_TYPE_AUDIO) {
244
                get_wav_header(pb, st->codec, type_specific_size);
245
                st->need_parsing = 1;
246
                /* We have to init the frame size at some point .... */
247
                pos2 = url_ftell(pb);
248
                if (gsize > (pos2 + 8 - pos1 + 24)) {
249
                    asf_st->ds_span = get_byte(pb);
250
                    asf_st->ds_packet_size = get_le16(pb);
251
                    asf_st->ds_chunk_size = get_le16(pb);
252
                    get_le16(pb); //ds_data_size
253
                    get_byte(pb); //ds_silence_data
254
                }
255
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
256
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
257
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
258
                if (asf_st->ds_span > 1) {
259
                    if (!asf_st->ds_chunk_size
260
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
261
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
262
                        asf_st->ds_span = 0; // disable descrambling
263
                }
264
                switch (st->codec->codec_id) {
265
                case CODEC_ID_MP3:
266
                    st->codec->frame_size = MPA_FRAME_SIZE;
267
                    break;
268
                case CODEC_ID_PCM_S16LE:
269
                case CODEC_ID_PCM_S16BE:
270
                case CODEC_ID_PCM_U16LE:
271
                case CODEC_ID_PCM_U16BE:
272
                case CODEC_ID_PCM_S8:
273
                case CODEC_ID_PCM_U8:
274
                case CODEC_ID_PCM_ALAW:
275
                case CODEC_ID_PCM_MULAW:
276
                    st->codec->frame_size = 1;
277
                    break;
278
                default:
279
                    /* This is probably wrong, but it prevents a crash later */
280
                    st->codec->frame_size = 1;
281
                    break;
282
                }
283
            } else if (type == CODEC_TYPE_VIDEO) {
284
                get_le32(pb);
285
                get_le32(pb);
286
                get_byte(pb);
287
                size = get_le16(pb); /* size */
288
                sizeX= get_le32(pb); /* size */
289
                st->codec->width = get_le32(pb);
290
                st->codec->height = get_le32(pb);
291
                /* not available for asf */
292
                get_le16(pb); /* panes */
293
                st->codec->bits_per_sample = get_le16(pb); /* depth */
294
                tag1 = get_le32(pb);
295
                url_fskip(pb, 20);
296
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
297
                size= sizeX;
298
                if (size > 40) {
299
                    st->codec->extradata_size = size - 40;
300
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
301
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
302
                }
303

    
304
        /* Extract palette from extradata if bpp <= 8 */
305
        /* This code assumes that extradata contains only palette */
306
        /* This is true for all paletted codecs implemented in ffmpeg */
307
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
308
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
309
#ifdef WORDS_BIGENDIAN
310
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
311
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
312
#else
313
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
314
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
315
#endif
316
            st->codec->palctrl->palette_changed = 1;
317
        }
318

    
319
                st->codec->codec_tag = tag1;
320
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
321
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
322
                    st->need_parsing = 1;
323
            }
324
            pos2 = url_ftell(pb);
325
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
326
        } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
327
            asf->data_object_offset = url_ftell(pb);
328
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
329
            if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
330
                asf->data_object_size = gsize - 24;
331
            } else {
332
                asf->data_object_size = (uint64_t)-1;
333
            }
334
            break;
335
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
336
            int len1, len2, len3, len4, len5;
337

    
338
            len1 = get_le16(pb);
339
            len2 = get_le16(pb);
340
            len3 = get_le16(pb);
341
            len4 = get_le16(pb);
342
            len5 = get_le16(pb);
343
            get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
344
            get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
345
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
346
            get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
347
            url_fskip(pb, len5);
348
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
349
                int desc_count, i;
350

    
351
                desc_count = get_le16(pb);
352
                for(i=0;i<desc_count;i++)
353
                {
354
                        int name_len,value_type,value_len;
355
                        uint64_t value_num = 0;
356
                        char name[1024];
357

    
358
                        name_len = get_le16(pb);
359
                        get_str16_nolen(pb, name_len, name, sizeof(name));
360
                        value_type = get_le16(pb);
361
                        value_len = get_le16(pb);
362
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
363
                        {
364
                                if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
365
                                else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
366
                                else url_fskip(pb, value_len);
367
                        }
368
                        if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
369
                        {
370
                                value_num= get_value(pb, value_type);
371
                                if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
372
                                if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
373
                        }
374
                }
375
        } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
376
            int n, stream_num, name_len, value_len, value_type, value_num;
377
            n = get_le16(pb);
378

    
379
            for(i=0;i<n;i++) {
380
                char name[1024];
381

    
382
                get_le16(pb); //lang_list_index
383
                stream_num= get_le16(pb);
384
                name_len=   get_le16(pb);
385
                value_type= get_le16(pb);
386
                value_len=  get_le32(pb);
387

    
388
                get_str16_nolen(pb, name_len, name, sizeof(name));
389
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
390
                value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
391
                url_fskip(pb, value_len - 2);
392

    
393
                if(stream_num<128){
394
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
395
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
396
                }
397
            }
398
        } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
399
            int ext_len, payload_ext_ct, stream_ct;
400
            uint32_t ext_d;
401
            int64_t pos_ex_st;
402
            pos_ex_st = url_ftell(pb);
403

    
404
            get_le64(pb); // starttime
405
            get_le64(pb); // endtime
406
            get_le32(pb); // leak-datarate
407
            get_le32(pb); // bucket-datasize
408
            get_le32(pb); // init-bucket-fullness
409
            get_le32(pb); // alt-leak-datarate
410
            get_le32(pb); // alt-bucket-datasize
411
            get_le32(pb); // alt-init-bucket-fullness
412
            get_le32(pb); // max-object-size
413
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
414
            get_le16(pb); // stream-num
415
            get_le16(pb); // stream-language-id-index
416
            get_le64(pb); // avg frametime in 100ns units
417
            stream_ct = get_le16(pb); //stream-name-count
418
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
419

    
420
            for (i=0; i<stream_ct; i++){
421
                get_le16(pb);
422
                ext_len = get_le16(pb);
423
                url_fseek(pb, ext_len, SEEK_CUR);
424
            }
425

    
426
            for (i=0; i<payload_ext_ct; i++){
427
                get_guid(pb, &g);
428
                ext_d=get_le16(pb);
429
                ext_len=get_le32(pb);
430
                url_fseek(pb, ext_len, SEEK_CUR);
431
            }
432

    
433
            // there could be a optional stream properties object to follow
434
            // if so the next iteration will pick it up
435
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
436
            int v1, v2;
437
            get_guid(pb, &g);
438
            v1 = get_le32(pb);
439
            v2 = get_le16(pb);
440
#if 0
441
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
442
            int len, v1, n, num;
443
            char str[256], *q;
444
            char tag[16];
445

446
            get_guid(pb, &g);
447
            print_guid(&g);
448

449
            n = get_le32(pb);
450
            for(i=0;i<n;i++) {
451
                num = get_le16(pb); /* stream number */
452
                get_str16(pb, str, sizeof(str));
453
                get_str16(pb, str, sizeof(str));
454
                len = get_le16(pb);
455
                q = tag;
456
                while (len > 0) {
457
                    v1 = get_byte(pb);
458
                    if ((q - tag) < sizeof(tag) - 1)
459
                        *q++ = v1;
460
                    len--;
461
                }
462
                *q = '\0';
463
            }
464
#endif
465
        } else if (url_feof(pb)) {
466
            goto fail;
467
        } else {
468
            url_fseek(pb, gsize - 24, SEEK_CUR);
469
        }
470
    }
471
    get_guid(pb, &g);
472
    get_le64(pb);
473
    get_byte(pb);
474
    get_byte(pb);
475
    if (url_feof(pb))
476
        goto fail;
477
    asf->data_offset = url_ftell(pb);
478
    asf->packet_size_left = 0;
479

    
480

    
481
    for(i=0; i<128; i++){
482
        int stream_num= asf->asfid2avid[i];
483
        if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){
484
            AVCodecContext *codec= s->streams[stream_num]->codec;
485
            av_reduce(&codec->sample_aspect_ratio.num,
486
                    &codec->sample_aspect_ratio.den,
487
                    dar[i].num, dar[i].den, INT_MAX);
488
//av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
489
        }
490
    }
491

    
492
    return 0;
493

    
494
 fail:
495
     for(i=0;i<s->nb_streams;i++) {
496
        AVStream *st = s->streams[i];
497
        if (st) {
498
            av_free(st->priv_data);
499
            av_free(st->codec->extradata);
500
        }
501
        av_free(st);
502
    }
503
    return -1;
504
}
505

    
506
#define DO_2BITS(bits, var, defval) \
507
    switch (bits & 3) \
508
    { \
509
    case 3: var = get_le32(pb); rsize += 4; break; \
510
    case 2: var = get_le16(pb); rsize += 2; break; \
511
    case 1: var = get_byte(pb); rsize++; break; \
512
    default: var = defval; break; \
513
    }
514

    
515
/**
516
 *
517
 * @return <0 in case of an error
518
 */
519
static int asf_get_packet(AVFormatContext *s)
520
{
521
    ASFContext *asf = s->priv_data;
522
    ByteIOContext *pb = &s->pb;
523
    uint32_t packet_length, padsize;
524
    int rsize = 9;
525
    int c, d, e, off;
526

    
527
    off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
528

    
529
    c=d=e=-1;
530
    while(off-- > 0){
531
        c=d; d=e;
532
        e= get_byte(pb);
533
        if(c == 0x82 && !d && !e)
534
            break;
535
    }
536

    
537
    if (c != 0x82) {
538
        if (!url_feof(pb))
539
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
540
    }
541
    if ((c & 0x0f) == 2) { // always true for now
542
        if (d || e) {
543
            if (!url_feof(pb))
544
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
545
            return -1;
546
        }
547
        d= get_byte(pb);
548
        e= get_byte(pb);
549
        rsize+=2;
550
/*    }else{
551
        if (!url_feof(pb))
552
            printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
553
        return AVERROR_IO;*/
554
    }
555

    
556
    asf->packet_flags = d;
557
    asf->packet_property = e;
558

    
559
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
560
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
561
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
562

    
563
    //the following checks prevent overflows and infinite loops
564
    if(packet_length >= (1U<<29)){
565
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
566
        return -1;
567
    }
568
    if(padsize >= packet_length){
569
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
570
        return -1;
571
    }
572

    
573
    asf->packet_timestamp = get_le32(pb);
574
    get_le16(pb); /* duration */
575
    // rsize has at least 11 bytes which have to be present
576

    
577
    if (asf->packet_flags & 0x01) {
578
        asf->packet_segsizetype = get_byte(pb); rsize++;
579
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
580
    } else {
581
        asf->packet_segments = 1;
582
        asf->packet_segsizetype = 0x80;
583
    }
584
    asf->packet_size_left = packet_length - padsize - rsize;
585
    if (packet_length < asf->hdr.min_pktsize)
586
        padsize += asf->hdr.min_pktsize - packet_length;
587
    asf->packet_padsize = padsize;
588
#ifdef DEBUG
589
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
590
#endif
591
    return 0;
592
}
593

    
594
/**
595
 *
596
 * @return <0 if error
597
 */
598
static int asf_read_frame_header(AVFormatContext *s){
599
    ASFContext *asf = s->priv_data;
600
    ByteIOContext *pb = &s->pb;
601
    int rsize = 1;
602
    int num = get_byte(pb);
603

    
604
    asf->packet_segments--;
605
    asf->packet_key_frame = num >> 7;
606
    asf->stream_index = asf->asfid2avid[num & 0x7f];
607
    // sequence should be ignored!
608
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
609
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
610
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
611
//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);
612
    if (asf->packet_replic_size >= 8) {
613
        asf->packet_obj_size = get_le32(pb);
614
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
615
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
616
            return -1;
617
        }
618
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
619
        url_fskip(pb, asf->packet_replic_size - 8);
620
        rsize += asf->packet_replic_size; // FIXME - check validity
621
    } else if (asf->packet_replic_size==1){
622
        // multipacket - frag_offset is begining timestamp
623
        asf->packet_time_start = asf->packet_frag_offset;
624
        asf->packet_frag_offset = 0;
625
        asf->packet_frag_timestamp = asf->packet_timestamp;
626

    
627
        asf->packet_time_delta = get_byte(pb);
628
        rsize++;
629
    }else if(asf->packet_replic_size!=0){
630
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
631
        return -1;
632
    }
633
    if (asf->packet_flags & 0x01) {
634
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
635
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
636
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
637
            return -1;
638
        }
639
        //printf("Fragsize %d\n", asf->packet_frag_size);
640
    } else {
641
        asf->packet_frag_size = asf->packet_size_left - rsize;
642
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
643
    }
644
    if (asf->packet_replic_size == 1) {
645
        asf->packet_multi_size = asf->packet_frag_size;
646
        if (asf->packet_multi_size > asf->packet_size_left)
647
            return -1;
648
    }
649
    asf->packet_size_left -= rsize;
650
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
651

    
652
    return 0;
653
}
654

    
655
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
656
{
657
    ASFContext *asf = s->priv_data;
658
    ASFStream *asf_st = 0;
659
    ByteIOContext *pb = &s->pb;
660
    //static int pc = 0;
661
    for (;;) {
662
        if(url_feof(pb))
663
            return AVERROR_IO;
664
        if (asf->packet_size_left < FRAME_HEADER_SIZE
665
            || asf->packet_segments < 1) {
666
            //asf->packet_size_left <= asf->packet_padsize) {
667
            int ret = asf->packet_size_left + asf->packet_padsize;
668
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
669
            assert(ret>=0);
670
            /* fail safe */
671
            url_fskip(pb, ret);
672

    
673
            asf->packet_pos= url_ftell(&s->pb);
674
            if (asf->data_object_size != (uint64_t)-1 &&
675
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
676
                return AVERROR_IO; /* Do not exceed the size of the data object */
677
            ret = asf_get_packet(s);
678
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
679
            if (ret < 0)
680
                assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
681
            asf->packet_time_start = 0;
682
            continue;
683
        }
684
        if (asf->packet_time_start == 0) {
685
            if(asf_read_frame_header(s) < 0){
686
                asf->packet_segments= 0;
687
                continue;
688
            }
689
            if (asf->stream_index < 0
690
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
691
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
692
                ) {
693
                asf->packet_time_start = 0;
694
                /* unhandled packet (should not happen) */
695
                url_fskip(pb, asf->packet_frag_size);
696
                asf->packet_size_left -= asf->packet_frag_size;
697
                if(asf->stream_index < 0)
698
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
699
                continue;
700
            }
701
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
702
        }
703
        asf_st = asf->asf_st;
704

    
705
        if (asf->packet_replic_size == 1) {
706
            // frag_offset is here used as the begining timestamp
707
            asf->packet_frag_timestamp = asf->packet_time_start;
708
            asf->packet_time_start += asf->packet_time_delta;
709
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
710
            asf->packet_size_left--;
711
            asf->packet_multi_size--;
712
            if (asf->packet_multi_size < asf->packet_obj_size)
713
            {
714
                asf->packet_time_start = 0;
715
                url_fskip(pb, asf->packet_multi_size);
716
                asf->packet_size_left -= asf->packet_multi_size;
717
                continue;
718
            }
719
            asf->packet_multi_size -= asf->packet_obj_size;
720
            //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);
721
        }
722
        if (   asf_st->pkt.size != asf->packet_obj_size
723
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
724
            if(asf_st->pkt.data){
725
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
726
                asf_st->frag_offset = 0;
727
                av_free_packet(&asf_st->pkt);
728
            }
729
            /* new packet */
730
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
731
            asf_st->seq = asf->packet_seq;
732
            asf_st->pkt.pts = asf->packet_frag_timestamp;
733
            asf_st->pkt.stream_index = asf->stream_index;
734
            asf_st->pkt.pos =
735
            asf_st->packet_pos= asf->packet_pos;
736
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
737
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
738
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
739
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
740
                asf->packet_key_frame = 1;
741
            if (asf->packet_key_frame)
742
                asf_st->pkt.flags |= PKT_FLAG_KEY;
743
        }
744

    
745
        /* read data */
746
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
747
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
748
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
749
        asf->packet_size_left -= asf->packet_frag_size;
750
        if (asf->packet_size_left < 0)
751
            continue;
752

    
753
        if(   asf->packet_frag_offset >= asf_st->pkt.size
754
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
755
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
756
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
757
            continue;
758
        }
759

    
760
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
761
                   asf->packet_frag_size);
762
        asf_st->frag_offset += asf->packet_frag_size;
763
        /* test if whole packet is read */
764
        if (asf_st->frag_offset == asf_st->pkt.size) {
765
            /* return packet */
766
            if (asf_st->ds_span > 1) {
767
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
768
                    av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
769
              }else{
770
                /* packet descrambling */
771
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
772
                if (newdata) {
773
                    int offset = 0;
774
                    while (offset < asf_st->pkt.size) {
775
                        int off = offset / asf_st->ds_chunk_size;
776
                        int row = off / asf_st->ds_span;
777
                        int col = off % asf_st->ds_span;
778
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
779
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
780

    
781
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
782
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
783
                        memcpy(newdata + offset,
784
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
785
                               asf_st->ds_chunk_size);
786
                        offset += asf_st->ds_chunk_size;
787
                    }
788
                    av_free(asf_st->pkt.data);
789
                    asf_st->pkt.data = newdata;
790
                }
791
              }
792
            }
793
            asf_st->frag_offset = 0;
794
            *pkt= asf_st->pkt;
795
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
796
            asf_st->pkt.size = 0;
797
            asf_st->pkt.data = 0;
798
            break; // packet completed
799
        }
800
    }
801
    return 0;
802
}
803

    
804
static int asf_read_close(AVFormatContext *s)
805
{
806
    int i;
807

    
808
    for(i=0;i<s->nb_streams;i++) {
809
        AVStream *st = s->streams[i];
810
        av_free(st->priv_data);
811
        av_free(st->codec->palctrl);
812
    }
813
    return 0;
814
}
815

    
816
// Added to support seeking after packets have been read
817
// If information is not reset, read_packet fails due to
818
// leftover information from previous reads
819
static void asf_reset_header(AVFormatContext *s)
820
{
821
    ASFContext *asf = s->priv_data;
822
    ASFStream *asf_st;
823
    int i;
824

    
825
    asf->packet_nb_frames = 0;
826
    asf->packet_size_left = 0;
827
    asf->packet_segments = 0;
828
    asf->packet_flags = 0;
829
    asf->packet_property = 0;
830
    asf->packet_timestamp = 0;
831
    asf->packet_segsizetype = 0;
832
    asf->packet_segments = 0;
833
    asf->packet_seq = 0;
834
    asf->packet_replic_size = 0;
835
    asf->packet_key_frame = 0;
836
    asf->packet_padsize = 0;
837
    asf->packet_frag_offset = 0;
838
    asf->packet_frag_size = 0;
839
    asf->packet_frag_timestamp = 0;
840
    asf->packet_multi_size = 0;
841
    asf->packet_obj_size = 0;
842
    asf->packet_time_delta = 0;
843
    asf->packet_time_start = 0;
844

    
845
    for(i=0; i<s->nb_streams; i++){
846
        asf_st= s->streams[i]->priv_data;
847
        av_free_packet(&asf_st->pkt);
848
        asf_st->frag_offset=0;
849
        asf_st->seq=0;
850
    }
851
    asf->asf_st= NULL;
852
}
853

    
854
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
855
{
856
    ASFContext *asf = s->priv_data;
857
    AVPacket pkt1, *pkt = &pkt1;
858
    ASFStream *asf_st;
859
    int64_t pts;
860
    int64_t pos= *ppos;
861
    int i;
862
    int64_t start_pos[s->nb_streams];
863

    
864
    for(i=0; i<s->nb_streams; i++){
865
        start_pos[i]= pos;
866
    }
867

    
868
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
869
    *ppos= pos;
870
    url_fseek(&s->pb, pos, SEEK_SET);
871

    
872
//printf("asf_read_pts\n");
873
    asf_reset_header(s);
874
    for(;;){
875
        if (av_read_frame(s, pkt) < 0){
876
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
877
            return AV_NOPTS_VALUE;
878
        }
879

    
880
        pts= pkt->pts;
881

    
882
        av_free_packet(pkt);
883
        if(pkt->flags&PKT_FLAG_KEY){
884
            i= pkt->stream_index;
885

    
886
            asf_st= s->streams[i]->priv_data;
887

    
888
//            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
889
            pos= asf_st->packet_pos;
890

    
891
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
892
            start_pos[i]= asf_st->packet_pos + 1;
893

    
894
            if(pkt->stream_index == stream_index)
895
               break;
896
        }
897
    }
898

    
899
    *ppos= pos;
900
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
901

    
902
    return pts;
903
}
904

    
905
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
906
{
907
    GUID g;
908
    ASFContext *asf = s->priv_data;
909
    int64_t gsize, itime;
910
    int64_t pos, current_pos, index_pts;
911
    int i;
912
    int pct,ict;
913

    
914
    current_pos = url_ftell(&s->pb);
915

    
916
    url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
917
    get_guid(&s->pb, &g);
918
    if (!memcmp(&g, &index_guid, sizeof(GUID))) {
919
        gsize = get_le64(&s->pb);
920
        get_guid(&s->pb, &g);
921
        itime=get_le64(&s->pb);
922
        pct=get_le32(&s->pb);
923
        ict=get_le32(&s->pb);
924
        av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
925

    
926
        for (i=0;i<ict;i++){
927
            int pktnum=get_le32(&s->pb);
928
            int pktct =get_le16(&s->pb);
929
            av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
930

    
931
            pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
932
            index_pts=av_rescale(itime, i, 10000);
933

    
934
            av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
935
        }
936
        asf->index_read= 1;
937
    }
938
    url_fseek(&s->pb, current_pos, SEEK_SET);
939
}
940

    
941
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
942
{
943
    ASFContext *asf = s->priv_data;
944
    AVStream *st = s->streams[stream_index];
945
    int64_t pos;
946
    int index;
947

    
948
    if (asf->packet_size <= 0)
949
        return -1;
950

    
951
    if (!asf->index_read)
952
        asf_build_simple_index(s, stream_index);
953

    
954
    if(!(asf->index_read && st->index_entries)){
955
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
956
            return -1;
957
    }else{
958
        index= av_index_search_timestamp(st, pts, flags);
959
        if(index<0)
960
            return -1;
961

    
962
        /* find the position */
963
        pos = st->index_entries[index].pos;
964
        pts = st->index_entries[index].timestamp;
965

    
966
    // various attempts to find key frame have failed so far
967
    //    asf_reset_header(s);
968
    //    url_fseek(&s->pb, pos, SEEK_SET);
969
    //    key_pos = pos;
970
    //     for(i=0;i<16;i++){
971
    //         pos = url_ftell(&s->pb);
972
    //         if (av_read_frame(s, &pkt) < 0){
973
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
974
    //             return -1;
975
    //         }
976
    //         asf_st = s->streams[stream_index]->priv_data;
977
    //         pos += st->parser->frame_offset;
978
    //
979
    //         if (pkt.size > b) {
980
    //             b = pkt.size;
981
    //             key_pos = pos;
982
    //         }
983
    //
984
    //         av_free_packet(&pkt);
985
    //     }
986

    
987
        /* do the seek */
988
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
989
        url_fseek(&s->pb, pos, SEEK_SET);
990
    }
991
    asf_reset_header(s);
992
    return 0;
993
}
994

    
995
AVInputFormat asf_demuxer = {
996
    "asf",
997
    "asf format",
998
    sizeof(ASFContext),
999
    asf_probe,
1000
    asf_read_header,
1001
    asf_read_packet,
1002
    asf_read_close,
1003
    asf_read_seek,
1004
    asf_read_pts,
1005
};