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ffmpeg / libavformat / asf.c @ 30e88789

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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
            codec->sample_aspect_ratio=
486
                av_div_q(
487
                    dar[i],
488
                    (AVRational){codec->width, codec->height}
489
                );
490
//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);
491
        }
492
    }
493

    
494
    return 0;
495

    
496
 fail:
497
     for(i=0;i<s->nb_streams;i++) {
498
        AVStream *st = s->streams[i];
499
        if (st) {
500
            av_free(st->priv_data);
501
            av_free(st->codec->extradata);
502
        }
503
        av_free(st);
504
    }
505
    return -1;
506
}
507

    
508
#define DO_2BITS(bits, var, defval) \
509
    switch (bits & 3) \
510
    { \
511
    case 3: var = get_le32(pb); rsize += 4; break; \
512
    case 2: var = get_le16(pb); rsize += 2; break; \
513
    case 1: var = get_byte(pb); rsize++; break; \
514
    default: var = defval; break; \
515
    }
516

    
517
/**
518
 *
519
 * @return <0 in case of an error
520
 */
521
static int asf_get_packet(AVFormatContext *s)
522
{
523
    ASFContext *asf = s->priv_data;
524
    ByteIOContext *pb = &s->pb;
525
    uint32_t packet_length, padsize;
526
    int rsize = 9;
527
    int c, d, e, off;
528

    
529
    off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
530

    
531
    c=d=e=-1;
532
    while(off-- > 0){
533
        c=d; d=e;
534
        e= get_byte(pb);
535
        if(c == 0x82 && !d && !e)
536
            break;
537
    }
538

    
539
    if (c != 0x82) {
540
        if (!url_feof(pb))
541
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
542
    }
543
    if ((c & 0x0f) == 2) { // always true for now
544
        if (d || e) {
545
            if (!url_feof(pb))
546
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
547
            return -1;
548
        }
549
        d= get_byte(pb);
550
        e= get_byte(pb);
551
        rsize+=2;
552
/*    }else{
553
        if (!url_feof(pb))
554
            printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
555
        return AVERROR_IO;*/
556
    }
557

    
558
    asf->packet_flags = d;
559
    asf->packet_property = e;
560

    
561
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
562
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
563
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
564

    
565
    //the following checks prevent overflows and infinite loops
566
    if(packet_length >= (1U<<29)){
567
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
568
        return -1;
569
    }
570
    if(padsize >= packet_length){
571
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
572
        return -1;
573
    }
574

    
575
    asf->packet_timestamp = get_le32(pb);
576
    get_le16(pb); /* duration */
577
    // rsize has at least 11 bytes which have to be present
578

    
579
    if (asf->packet_flags & 0x01) {
580
        asf->packet_segsizetype = get_byte(pb); rsize++;
581
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
582
    } else {
583
        asf->packet_segments = 1;
584
        asf->packet_segsizetype = 0x80;
585
    }
586
    asf->packet_size_left = packet_length - padsize - rsize;
587
    if (packet_length < asf->hdr.min_pktsize)
588
        padsize += asf->hdr.min_pktsize - packet_length;
589
    asf->packet_padsize = padsize;
590
#ifdef DEBUG
591
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
592
#endif
593
    return 0;
594
}
595

    
596
/**
597
 *
598
 * @return <0 if error
599
 */
600
static int asf_read_frame_header(AVFormatContext *s){
601
    ASFContext *asf = s->priv_data;
602
    ByteIOContext *pb = &s->pb;
603
    int rsize = 1;
604
    int num = get_byte(pb);
605

    
606
    asf->packet_segments--;
607
    asf->packet_key_frame = num >> 7;
608
    asf->stream_index = asf->asfid2avid[num & 0x7f];
609
    // sequence should be ignored!
610
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
611
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
612
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
613
//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);
614
    if (asf->packet_replic_size >= 8) {
615
        asf->packet_obj_size = get_le32(pb);
616
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
617
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
618
            return -1;
619
        }
620
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
621
        url_fskip(pb, asf->packet_replic_size - 8);
622
        rsize += asf->packet_replic_size; // FIXME - check validity
623
    } else if (asf->packet_replic_size==1){
624
        // multipacket - frag_offset is begining timestamp
625
        asf->packet_time_start = asf->packet_frag_offset;
626
        asf->packet_frag_offset = 0;
627
        asf->packet_frag_timestamp = asf->packet_timestamp;
628

    
629
        asf->packet_time_delta = get_byte(pb);
630
        rsize++;
631
    }else if(asf->packet_replic_size!=0){
632
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
633
        return -1;
634
    }
635
    if (asf->packet_flags & 0x01) {
636
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
637
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
638
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
639
            return -1;
640
        }
641
        //printf("Fragsize %d\n", asf->packet_frag_size);
642
    } else {
643
        asf->packet_frag_size = asf->packet_size_left - rsize;
644
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
645
    }
646
    if (asf->packet_replic_size == 1) {
647
        asf->packet_multi_size = asf->packet_frag_size;
648
        if (asf->packet_multi_size > asf->packet_size_left)
649
            return -1;
650
    }
651
    asf->packet_size_left -= rsize;
652
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
653

    
654
    return 0;
655
}
656

    
657
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
658
{
659
    ASFContext *asf = s->priv_data;
660
    ASFStream *asf_st = 0;
661
    ByteIOContext *pb = &s->pb;
662
    //static int pc = 0;
663
    for (;;) {
664
        if(url_feof(pb))
665
            return AVERROR_IO;
666
        if (asf->packet_size_left < FRAME_HEADER_SIZE
667
            || asf->packet_segments < 1) {
668
            //asf->packet_size_left <= asf->packet_padsize) {
669
            int ret = asf->packet_size_left + asf->packet_padsize;
670
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
671
            assert(ret>=0);
672
            /* fail safe */
673
            url_fskip(pb, ret);
674

    
675
            asf->packet_pos= url_ftell(&s->pb);
676
            if (asf->data_object_size != (uint64_t)-1 &&
677
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
678
                return AVERROR_IO; /* Do not exceed the size of the data object */
679
            ret = asf_get_packet(s);
680
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
681
            if (ret < 0)
682
                assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
683
            asf->packet_time_start = 0;
684
            continue;
685
        }
686
        if (asf->packet_time_start == 0) {
687
            if(asf_read_frame_header(s) < 0){
688
                asf->packet_segments= 0;
689
                continue;
690
            }
691
            if (asf->stream_index < 0
692
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
693
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
694
                ) {
695
                asf->packet_time_start = 0;
696
                /* unhandled packet (should not happen) */
697
                url_fskip(pb, asf->packet_frag_size);
698
                asf->packet_size_left -= asf->packet_frag_size;
699
                if(asf->stream_index < 0)
700
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
701
                continue;
702
            }
703
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
704
        }
705
        asf_st = asf->asf_st;
706

    
707
        if (asf->packet_replic_size == 1) {
708
            // frag_offset is here used as the begining timestamp
709
            asf->packet_frag_timestamp = asf->packet_time_start;
710
            asf->packet_time_start += asf->packet_time_delta;
711
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
712
            asf->packet_size_left--;
713
            asf->packet_multi_size--;
714
            if (asf->packet_multi_size < asf->packet_obj_size)
715
            {
716
                asf->packet_time_start = 0;
717
                url_fskip(pb, asf->packet_multi_size);
718
                asf->packet_size_left -= asf->packet_multi_size;
719
                continue;
720
            }
721
            asf->packet_multi_size -= asf->packet_obj_size;
722
            //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);
723
        }
724
        if (   asf_st->pkt.size != asf->packet_obj_size
725
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
726
            if(asf_st->pkt.data){
727
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
728
                asf_st->frag_offset = 0;
729
                av_free_packet(&asf_st->pkt);
730
            }
731
            /* new packet */
732
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
733
            asf_st->seq = asf->packet_seq;
734
            asf_st->pkt.pts = asf->packet_frag_timestamp;
735
            asf_st->pkt.stream_index = asf->stream_index;
736
            asf_st->pkt.pos =
737
            asf_st->packet_pos= asf->packet_pos;
738
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
739
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
740
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
741
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
742
                asf->packet_key_frame = 1;
743
            if (asf->packet_key_frame)
744
                asf_st->pkt.flags |= PKT_FLAG_KEY;
745
        }
746

    
747
        /* read data */
748
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
749
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
750
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
751
        asf->packet_size_left -= asf->packet_frag_size;
752
        if (asf->packet_size_left < 0)
753
            continue;
754

    
755
        if(   asf->packet_frag_offset >= asf_st->pkt.size
756
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
757
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
758
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
759
            continue;
760
        }
761

    
762
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
763
                   asf->packet_frag_size);
764
        asf_st->frag_offset += asf->packet_frag_size;
765
        /* test if whole packet is read */
766
        if (asf_st->frag_offset == asf_st->pkt.size) {
767
            /* return packet */
768
            if (asf_st->ds_span > 1) {
769
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
770
                    av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
771
              }else{
772
                /* packet descrambling */
773
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
774
                if (newdata) {
775
                    int offset = 0;
776
                    while (offset < asf_st->pkt.size) {
777
                        int off = offset / asf_st->ds_chunk_size;
778
                        int row = off / asf_st->ds_span;
779
                        int col = off % asf_st->ds_span;
780
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
781
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
782

    
783
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
784
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
785
                        memcpy(newdata + offset,
786
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
787
                               asf_st->ds_chunk_size);
788
                        offset += asf_st->ds_chunk_size;
789
                    }
790
                    av_free(asf_st->pkt.data);
791
                    asf_st->pkt.data = newdata;
792
                }
793
              }
794
            }
795
            asf_st->frag_offset = 0;
796
            *pkt= asf_st->pkt;
797
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
798
            asf_st->pkt.size = 0;
799
            asf_st->pkt.data = 0;
800
            break; // packet completed
801
        }
802
    }
803
    return 0;
804
}
805

    
806
static int asf_read_close(AVFormatContext *s)
807
{
808
    int i;
809

    
810
    for(i=0;i<s->nb_streams;i++) {
811
        AVStream *st = s->streams[i];
812
        av_free(st->priv_data);
813
        av_free(st->codec->palctrl);
814
    }
815
    return 0;
816
}
817

    
818
// Added to support seeking after packets have been read
819
// If information is not reset, read_packet fails due to
820
// leftover information from previous reads
821
static void asf_reset_header(AVFormatContext *s)
822
{
823
    ASFContext *asf = s->priv_data;
824
    ASFStream *asf_st;
825
    int i;
826

    
827
    asf->packet_nb_frames = 0;
828
    asf->packet_size_left = 0;
829
    asf->packet_segments = 0;
830
    asf->packet_flags = 0;
831
    asf->packet_property = 0;
832
    asf->packet_timestamp = 0;
833
    asf->packet_segsizetype = 0;
834
    asf->packet_segments = 0;
835
    asf->packet_seq = 0;
836
    asf->packet_replic_size = 0;
837
    asf->packet_key_frame = 0;
838
    asf->packet_padsize = 0;
839
    asf->packet_frag_offset = 0;
840
    asf->packet_frag_size = 0;
841
    asf->packet_frag_timestamp = 0;
842
    asf->packet_multi_size = 0;
843
    asf->packet_obj_size = 0;
844
    asf->packet_time_delta = 0;
845
    asf->packet_time_start = 0;
846

    
847
    for(i=0; i<s->nb_streams; i++){
848
        asf_st= s->streams[i]->priv_data;
849
        av_free_packet(&asf_st->pkt);
850
        asf_st->frag_offset=0;
851
        asf_st->seq=0;
852
    }
853
    asf->asf_st= NULL;
854
}
855

    
856
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
857
{
858
    ASFContext *asf = s->priv_data;
859
    AVPacket pkt1, *pkt = &pkt1;
860
    ASFStream *asf_st;
861
    int64_t pts;
862
    int64_t pos= *ppos;
863
    int i;
864
    int64_t start_pos[s->nb_streams];
865

    
866
    for(i=0; i<s->nb_streams; i++){
867
        start_pos[i]= pos;
868
    }
869

    
870
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
871
    *ppos= pos;
872
    url_fseek(&s->pb, pos, SEEK_SET);
873

    
874
//printf("asf_read_pts\n");
875
    asf_reset_header(s);
876
    for(;;){
877
        if (av_read_frame(s, pkt) < 0){
878
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
879
            return AV_NOPTS_VALUE;
880
        }
881

    
882
        pts= pkt->pts;
883

    
884
        av_free_packet(pkt);
885
        if(pkt->flags&PKT_FLAG_KEY){
886
            i= pkt->stream_index;
887

    
888
            asf_st= s->streams[i]->priv_data;
889

    
890
//            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
891
            pos= asf_st->packet_pos;
892

    
893
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
894
            start_pos[i]= asf_st->packet_pos + 1;
895

    
896
            if(pkt->stream_index == stream_index)
897
               break;
898
        }
899
    }
900

    
901
    *ppos= pos;
902
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
903

    
904
    return pts;
905
}
906

    
907
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
908
{
909
    GUID g;
910
    ASFContext *asf = s->priv_data;
911
    int64_t gsize, itime;
912
    int64_t pos, current_pos, index_pts;
913
    int i;
914
    int pct,ict;
915

    
916
    current_pos = url_ftell(&s->pb);
917

    
918
    url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
919
    get_guid(&s->pb, &g);
920
    if (!memcmp(&g, &index_guid, sizeof(GUID))) {
921
        gsize = get_le64(&s->pb);
922
        get_guid(&s->pb, &g);
923
        itime=get_le64(&s->pb);
924
        pct=get_le32(&s->pb);
925
        ict=get_le32(&s->pb);
926
        av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
927

    
928
        for (i=0;i<ict;i++){
929
            int pktnum=get_le32(&s->pb);
930
            int pktct =get_le16(&s->pb);
931
            av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
932

    
933
            pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
934
            index_pts=av_rescale(itime, i, 10000);
935

    
936
            av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
937
        }
938
        asf->index_read= 1;
939
    }
940
    url_fseek(&s->pb, current_pos, SEEK_SET);
941
}
942

    
943
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
944
{
945
    ASFContext *asf = s->priv_data;
946
    AVStream *st = s->streams[stream_index];
947
    int64_t pos;
948
    int index;
949

    
950
    if (asf->packet_size <= 0)
951
        return -1;
952

    
953
    if (!asf->index_read)
954
        asf_build_simple_index(s, stream_index);
955

    
956
    if(!(asf->index_read && st->index_entries)){
957
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
958
            return -1;
959
    }else{
960
        index= av_index_search_timestamp(st, pts, flags);
961
        if(index<0)
962
            return -1;
963

    
964
        /* find the position */
965
        pos = st->index_entries[index].pos;
966
        pts = st->index_entries[index].timestamp;
967

    
968
    // various attempts to find key frame have failed so far
969
    //    asf_reset_header(s);
970
    //    url_fseek(&s->pb, pos, SEEK_SET);
971
    //    key_pos = pos;
972
    //     for(i=0;i<16;i++){
973
    //         pos = url_ftell(&s->pb);
974
    //         if (av_read_frame(s, &pkt) < 0){
975
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
976
    //             return -1;
977
    //         }
978
    //         asf_st = s->streams[stream_index]->priv_data;
979
    //         pos += st->parser->frame_offset;
980
    //
981
    //         if (pkt.size > b) {
982
    //             b = pkt.size;
983
    //             key_pos = pos;
984
    //         }
985
    //
986
    //         av_free_packet(&pkt);
987
    //     }
988

    
989
        /* do the seek */
990
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
991
        url_fseek(&s->pb, pos, SEEK_SET);
992
    }
993
    asf_reset_header(s);
994
    return 0;
995
}
996

    
997
AVInputFormat asf_demuxer = {
998
    "asf",
999
    "asf format",
1000
    sizeof(ASFContext),
1001
    asf_probe,
1002
    asf_read_header,
1003
    asf_read_packet,
1004
    asf_read_close,
1005
    asf_read_seek,
1006
    asf_read_pts,
1007
};