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ffmpeg / libavformat / asf.c @ 8509fc7b

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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
static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
38
    0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
39
};
40
/**********************************/
41
/* decoding */
42

    
43
//#define DEBUG
44

    
45
#ifdef DEBUG
46
#define PRINT_IF_GUID(g,cmp) \
47
if (!memcmp(g, &cmp, sizeof(GUID))) \
48
    printf("(GUID: %s) ", #cmp)
49

    
50
static void print_guid(const GUID *g)
51
{
52
    int i;
53
    PRINT_IF_GUID(g, asf_header);
54
    else PRINT_IF_GUID(g, file_header);
55
    else PRINT_IF_GUID(g, stream_header);
56
    else PRINT_IF_GUID(g, audio_stream);
57
    else PRINT_IF_GUID(g, audio_conceal_none);
58
    else PRINT_IF_GUID(g, video_stream);
59
    else PRINT_IF_GUID(g, video_conceal_none);
60
    else PRINT_IF_GUID(g, command_stream);
61
    else PRINT_IF_GUID(g, comment_header);
62
    else PRINT_IF_GUID(g, codec_comment_header);
63
    else PRINT_IF_GUID(g, codec_comment1_header);
64
    else PRINT_IF_GUID(g, data_header);
65
    else PRINT_IF_GUID(g, index_guid);
66
    else PRINT_IF_GUID(g, head1_guid);
67
    else PRINT_IF_GUID(g, head2_guid);
68
    else PRINT_IF_GUID(g, my_guid);
69
    else PRINT_IF_GUID(g, ext_stream_header);
70
    else PRINT_IF_GUID(g, extended_content_header);
71
    else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
72
    else PRINT_IF_GUID(g, ext_stream_audio_stream);
73
    else PRINT_IF_GUID(g, metadata_header);
74
    else PRINT_IF_GUID(g, stream_bitrate_guid);
75
    else
76
        printf("(GUID: unknown) ");
77
    for(i=0;i<16;i++)
78
        printf(" 0x%02x,", (*g)[i]);
79
    printf("}\n");
80
}
81
#undef PRINT_IF_GUID
82
#endif
83

    
84
static void get_guid(ByteIOContext *s, GUID *g)
85
{
86
    assert(sizeof(*g) == 16);
87
    get_buffer(s, g, sizeof(*g));
88
}
89

    
90
#if 0
91
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
92
{
93
    int len, c;
94
    char *q;
95

96
    len = get_le16(pb);
97
    q = buf;
98
    while (len > 0) {
99
        c = get_le16(pb);
100
        if ((q - buf) < buf_size - 1)
101
            *q++ = c;
102
        len--;
103
    }
104
    *q = '\0';
105
}
106
#endif
107

    
108
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
109
{
110
    char* q = buf;
111
    len /= 2;
112
    while (len--) {
113
        uint8_t tmp;
114
        PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
115
    }
116
    *q = '\0';
117
}
118

    
119
static int asf_probe(AVProbeData *pd)
120
{
121
    /* check file header */
122
    if (pd->buf_size <= 32)
123
        return 0;
124

    
125
    if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
126
        return AVPROBE_SCORE_MAX;
127
    else
128
        return 0;
129
}
130

    
131
static int get_value(ByteIOContext *pb, int type){
132
    switch(type){
133
        case 2: return get_le32(pb);
134
        case 3: return get_le32(pb);
135
        case 4: return get_le64(pb);
136
        case 5: return get_le16(pb);
137
        default:return INT_MIN;
138
    }
139
}
140

    
141
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
142
{
143
    ASFContext *asf = s->priv_data;
144
    GUID g;
145
    ByteIOContext *pb = &s->pb;
146
    AVStream *st;
147
    ASFStream *asf_st;
148
    int size, i;
149
    int64_t gsize;
150
    AVRational dar[128];
151

    
152
    memset(dar, 0, sizeof(dar));
153

    
154
    get_guid(pb, &g);
155
    if (memcmp(&g, &asf_header, sizeof(GUID)))
156
        goto fail;
157
    get_le64(pb);
158
    get_le32(pb);
159
    get_byte(pb);
160
    get_byte(pb);
161
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
162
    for(;;) {
163
        get_guid(pb, &g);
164
        gsize = get_le64(pb);
165
#ifdef DEBUG
166
        printf("%08"PRIx64": ", url_ftell(pb) - 24);
167
        print_guid(&g);
168
        printf("  size=0x%"PRIx64"\n", gsize);
169
#endif
170
        if (!memcmp(&g, &data_header, sizeof(GUID))) {
171
            asf->data_object_offset = url_ftell(pb);
172
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
173
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
174
                asf->data_object_size = gsize - 24;
175
            } else {
176
                asf->data_object_size = (uint64_t)-1;
177
            }
178
            break;
179
        }
180
        if (gsize < 24)
181
            goto fail;
182
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
183
            get_guid(pb, &asf->hdr.guid);
184
            asf->hdr.file_size          = get_le64(pb);
185
            asf->hdr.create_time        = get_le64(pb);
186
            asf->nb_packets             = get_le64(pb);
187
            asf->hdr.send_time          = get_le64(pb);
188
            asf->hdr.play_time          = get_le64(pb);
189
            asf->hdr.preroll            = get_le32(pb);
190
            asf->hdr.ignore             = get_le32(pb);
191
            asf->hdr.flags              = get_le32(pb);
192
            asf->hdr.min_pktsize        = get_le32(pb);
193
            asf->hdr.max_pktsize        = get_le32(pb);
194
            asf->hdr.max_bitrate        = get_le32(pb);
195
            asf->packet_size = asf->hdr.max_pktsize;
196
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
197
            int type, type_specific_size, sizeX;
198
            uint64_t total_size;
199
            unsigned int tag1;
200
            int64_t pos1, pos2;
201
            int test_for_ext_stream_audio;
202

    
203
            pos1 = url_ftell(pb);
204

    
205
            st = av_new_stream(s, 0);
206
            if (!st)
207
                goto fail;
208
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
209
            asf_st = av_mallocz(sizeof(ASFStream));
210
            if (!asf_st)
211
                goto fail;
212
            st->priv_data = asf_st;
213
            st->start_time = asf->hdr.preroll;
214
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
215
                st->duration = asf->hdr.send_time /
216
                    (10000000 / 1000) - st->start_time;
217
            }
218
            get_guid(pb, &g);
219

    
220
            test_for_ext_stream_audio = 0;
221
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
222
                type = CODEC_TYPE_AUDIO;
223
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
224
                type = CODEC_TYPE_VIDEO;
225
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
226
                type = CODEC_TYPE_UNKNOWN;
227
            } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
228
                test_for_ext_stream_audio = 1;
229
                type = CODEC_TYPE_UNKNOWN;
230
            } else {
231
                goto fail;
232
            }
233
            get_guid(pb, &g);
234
            total_size = get_le64(pb);
235
            type_specific_size = get_le32(pb);
236
            get_le32(pb);
237
            st->id = get_le16(pb) & 0x7f; /* stream id */
238
            // mapping of asf ID to AV stream ID;
239
            asf->asfid2avid[st->id] = s->nb_streams - 1;
240

    
241
            get_le32(pb);
242

    
243
            if (test_for_ext_stream_audio) {
244
                get_guid(pb, &g);
245
                if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
246
                    type = CODEC_TYPE_AUDIO;
247
                    get_guid(pb, &g);
248
                    get_le32(pb);
249
                    get_le32(pb);
250
                    get_le32(pb);
251
                    get_guid(pb, &g);
252
                    get_le32(pb);
253
                }
254
            }
255

    
256
            st->codec->codec_type = type;
257
            if (type == CODEC_TYPE_AUDIO) {
258
                get_wav_header(pb, st->codec, type_specific_size);
259
                st->need_parsing = 1;
260
                /* We have to init the frame size at some point .... */
261
                pos2 = url_ftell(pb);
262
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
263
                    asf_st->ds_span = get_byte(pb);
264
                    asf_st->ds_packet_size = get_le16(pb);
265
                    asf_st->ds_chunk_size = get_le16(pb);
266
                    get_le16(pb); //ds_data_size
267
                    get_byte(pb); //ds_silence_data
268
                }
269
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
270
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
271
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
272
                if (asf_st->ds_span > 1) {
273
                    if (!asf_st->ds_chunk_size
274
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
275
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
276
                        asf_st->ds_span = 0; // disable descrambling
277
                }
278
                switch (st->codec->codec_id) {
279
                case CODEC_ID_MP3:
280
                    st->codec->frame_size = MPA_FRAME_SIZE;
281
                    break;
282
                case CODEC_ID_PCM_S16LE:
283
                case CODEC_ID_PCM_S16BE:
284
                case CODEC_ID_PCM_U16LE:
285
                case CODEC_ID_PCM_U16BE:
286
                case CODEC_ID_PCM_S8:
287
                case CODEC_ID_PCM_U8:
288
                case CODEC_ID_PCM_ALAW:
289
                case CODEC_ID_PCM_MULAW:
290
                    st->codec->frame_size = 1;
291
                    break;
292
                default:
293
                    /* This is probably wrong, but it prevents a crash later */
294
                    st->codec->frame_size = 1;
295
                    break;
296
                }
297
            } else if (type == CODEC_TYPE_VIDEO) {
298
                get_le32(pb);
299
                get_le32(pb);
300
                get_byte(pb);
301
                size = get_le16(pb); /* size */
302
                sizeX= get_le32(pb); /* size */
303
                st->codec->width = get_le32(pb);
304
                st->codec->height = get_le32(pb);
305
                /* not available for asf */
306
                get_le16(pb); /* panes */
307
                st->codec->bits_per_sample = get_le16(pb); /* depth */
308
                tag1 = get_le32(pb);
309
                url_fskip(pb, 20);
310
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
311
                size= sizeX;
312
                if (size > 40) {
313
                    st->codec->extradata_size = size - 40;
314
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
315
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
316
                }
317

    
318
        /* Extract palette from extradata if bpp <= 8 */
319
        /* This code assumes that extradata contains only palette */
320
        /* This is true for all paletted codecs implemented in ffmpeg */
321
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
322
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
323
#ifdef WORDS_BIGENDIAN
324
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
325
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
326
#else
327
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
328
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
329
#endif
330
            st->codec->palctrl->palette_changed = 1;
331
        }
332

    
333
                st->codec->codec_tag = tag1;
334
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
335
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
336
                    st->need_parsing = 1;
337
            }
338
            pos2 = url_ftell(pb);
339
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
340
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
341
            int len1, len2, len3, len4, len5;
342

    
343
            len1 = get_le16(pb);
344
            len2 = get_le16(pb);
345
            len3 = get_le16(pb);
346
            len4 = get_le16(pb);
347
            len5 = get_le16(pb);
348
            get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
349
            get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
350
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
351
            get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
352
            url_fskip(pb, len5);
353
        } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
354
            int stream_count = get_le16(pb);
355
            int j;
356

    
357
//            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
358
//            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
359
            for(j = 0; j < stream_count; j++) {
360
                int flags, bitrate, stream_id;
361

    
362
                flags= get_le16(pb);
363
                bitrate= get_le32(pb);
364
                stream_id= (flags & 0x7f);
365
//                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
366
                asf->stream_bitrates[stream_id-1]= bitrate;
367
            }
368
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
369
                int desc_count, i;
370

    
371
                desc_count = get_le16(pb);
372
                for(i=0;i<desc_count;i++)
373
                {
374
                        int name_len,value_type,value_len;
375
                        uint64_t value_num = 0;
376
                        char name[1024];
377

    
378
                        name_len = get_le16(pb);
379
                        get_str16_nolen(pb, name_len, name, sizeof(name));
380
                        value_type = get_le16(pb);
381
                        value_len = get_le16(pb);
382
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
383
                        {
384
                                if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
385
                                else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
386
                                else url_fskip(pb, value_len);
387
                        }
388
                        if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
389
                        {
390
                                value_num= get_value(pb, value_type);
391
                                if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
392
                                if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
393
                        }
394
                }
395
        } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
396
            int n, stream_num, name_len, value_len, value_type, value_num;
397
            n = get_le16(pb);
398

    
399
            for(i=0;i<n;i++) {
400
                char name[1024];
401

    
402
                get_le16(pb); //lang_list_index
403
                stream_num= get_le16(pb);
404
                name_len=   get_le16(pb);
405
                value_type= get_le16(pb);
406
                value_len=  get_le32(pb);
407

    
408
                get_str16_nolen(pb, name_len, name, sizeof(name));
409
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
410
                value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
411
                url_fskip(pb, value_len - 2);
412

    
413
                if(stream_num<128){
414
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
415
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
416
                }
417
            }
418
        } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
419
            int ext_len, payload_ext_ct, stream_ct;
420
            uint32_t ext_d;
421
            int64_t pos_ex_st;
422
            pos_ex_st = url_ftell(pb);
423

    
424
            get_le64(pb); // starttime
425
            get_le64(pb); // endtime
426
            get_le32(pb); // leak-datarate
427
            get_le32(pb); // bucket-datasize
428
            get_le32(pb); // init-bucket-fullness
429
            get_le32(pb); // alt-leak-datarate
430
            get_le32(pb); // alt-bucket-datasize
431
            get_le32(pb); // alt-init-bucket-fullness
432
            get_le32(pb); // max-object-size
433
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
434
            get_le16(pb); // stream-num
435
            get_le16(pb); // stream-language-id-index
436
            get_le64(pb); // avg frametime in 100ns units
437
            stream_ct = get_le16(pb); //stream-name-count
438
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
439

    
440
            for (i=0; i<stream_ct; i++){
441
                get_le16(pb);
442
                ext_len = get_le16(pb);
443
                url_fseek(pb, ext_len, SEEK_CUR);
444
            }
445

    
446
            for (i=0; i<payload_ext_ct; i++){
447
                get_guid(pb, &g);
448
                ext_d=get_le16(pb);
449
                ext_len=get_le32(pb);
450
                url_fseek(pb, ext_len, SEEK_CUR);
451
            }
452

    
453
            // there could be a optional stream properties object to follow
454
            // if so the next iteration will pick it up
455
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
456
            int v1, v2;
457
            get_guid(pb, &g);
458
            v1 = get_le32(pb);
459
            v2 = get_le16(pb);
460
#if 0
461
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
462
            int len, v1, n, num;
463
            char str[256], *q;
464
            char tag[16];
465

466
            get_guid(pb, &g);
467
            print_guid(&g);
468

469
            n = get_le32(pb);
470
            for(i=0;i<n;i++) {
471
                num = get_le16(pb); /* stream number */
472
                get_str16(pb, str, sizeof(str));
473
                get_str16(pb, str, sizeof(str));
474
                len = get_le16(pb);
475
                q = tag;
476
                while (len > 0) {
477
                    v1 = get_byte(pb);
478
                    if ((q - tag) < sizeof(tag) - 1)
479
                        *q++ = v1;
480
                    len--;
481
                }
482
                *q = '\0';
483
            }
484
#endif
485
        } else if (url_feof(pb)) {
486
            goto fail;
487
        } else {
488
            url_fseek(pb, gsize - 24, SEEK_CUR);
489
        }
490
    }
491
    get_guid(pb, &g);
492
    get_le64(pb);
493
    get_byte(pb);
494
    get_byte(pb);
495
    if (url_feof(pb))
496
        goto fail;
497
    asf->data_offset = url_ftell(pb);
498
    asf->packet_size_left = 0;
499

    
500

    
501
    for(i=0; i<128; i++){
502
        int stream_num= asf->asfid2avid[i];
503
        if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){
504
            AVCodecContext *codec= s->streams[stream_num]->codec;
505
            av_reduce(&codec->sample_aspect_ratio.num,
506
                    &codec->sample_aspect_ratio.den,
507
                    dar[i].num, dar[i].den, INT_MAX);
508
//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);
509
        }
510
    }
511

    
512
    return 0;
513

    
514
 fail:
515
     for(i=0;i<s->nb_streams;i++) {
516
        AVStream *st = s->streams[i];
517
        if (st) {
518
            av_free(st->priv_data);
519
            av_free(st->codec->extradata);
520
        }
521
        av_free(st);
522
    }
523
    return -1;
524
}
525

    
526
#define DO_2BITS(bits, var, defval) \
527
    switch (bits & 3) \
528
    { \
529
    case 3: var = get_le32(pb); rsize += 4; break; \
530
    case 2: var = get_le16(pb); rsize += 2; break; \
531
    case 1: var = get_byte(pb); rsize++; break; \
532
    default: var = defval; break; \
533
    }
534

    
535
/**
536
 *
537
 * @return <0 in case of an error
538
 */
539
static int asf_get_packet(AVFormatContext *s)
540
{
541
    ASFContext *asf = s->priv_data;
542
    ByteIOContext *pb = &s->pb;
543
    uint32_t packet_length, padsize;
544
    int rsize = 9;
545
    int c, d, e, off;
546

    
547
    off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
548

    
549
    c=d=e=-1;
550
    while(off-- > 0){
551
        c=d; d=e;
552
        e= get_byte(pb);
553
        if(c == 0x82 && !d && !e)
554
            break;
555
    }
556

    
557
    if (c != 0x82) {
558
        if (!url_feof(pb))
559
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
560
    }
561
    if ((c & 0x0f) == 2) { // always true for now
562
        if (d || e) {
563
            if (!url_feof(pb))
564
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
565
            return -1;
566
        }
567
        d= get_byte(pb);
568
        e= get_byte(pb);
569
        rsize+=2;
570
/*    }else{
571
        if (!url_feof(pb))
572
            printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
573
        return AVERROR_IO;*/
574
    }
575

    
576
    asf->packet_flags = d;
577
    asf->packet_property = e;
578

    
579
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
580
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
581
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
582

    
583
    //the following checks prevent overflows and infinite loops
584
    if(packet_length >= (1U<<29)){
585
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
586
        return -1;
587
    }
588
    if(padsize >= packet_length){
589
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
590
        return -1;
591
    }
592

    
593
    asf->packet_timestamp = get_le32(pb);
594
    get_le16(pb); /* duration */
595
    // rsize has at least 11 bytes which have to be present
596

    
597
    if (asf->packet_flags & 0x01) {
598
        asf->packet_segsizetype = get_byte(pb); rsize++;
599
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
600
    } else {
601
        asf->packet_segments = 1;
602
        asf->packet_segsizetype = 0x80;
603
    }
604
    asf->packet_size_left = packet_length - padsize - rsize;
605
    if (packet_length < asf->hdr.min_pktsize)
606
        padsize += asf->hdr.min_pktsize - packet_length;
607
    asf->packet_padsize = padsize;
608
#ifdef DEBUG
609
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
610
#endif
611
    return 0;
612
}
613

    
614
/**
615
 *
616
 * @return <0 if error
617
 */
618
static int asf_read_frame_header(AVFormatContext *s){
619
    ASFContext *asf = s->priv_data;
620
    ByteIOContext *pb = &s->pb;
621
    int rsize = 1;
622
    int num = get_byte(pb);
623
    int64_t ts0, ts1;
624

    
625
    asf->packet_segments--;
626
    asf->packet_key_frame = num >> 7;
627
    asf->stream_index = asf->asfid2avid[num & 0x7f];
628
    // sequence should be ignored!
629
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
630
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
631
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
632
//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);
633
    if (asf->packet_replic_size >= 8) {
634
        asf->packet_obj_size = get_le32(pb);
635
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
636
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
637
            return -1;
638
        }
639
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
640
        if(asf->packet_replic_size >= 8+38+4){
641
//            for(i=0; i<asf->packet_replic_size-8; i++)
642
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
643
//            av_log(s, AV_LOG_DEBUG, "\n");
644
            url_fskip(pb, 10);
645
            ts0= get_le64(pb);
646
            ts1= get_le64(pb);
647
            url_fskip(pb, 12);
648
            get_le32(pb);
649
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
650
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
651
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
652
        }else
653
            url_fskip(pb, asf->packet_replic_size - 8);
654
        rsize += asf->packet_replic_size; // FIXME - check validity
655
    } else if (asf->packet_replic_size==1){
656
        // multipacket - frag_offset is begining timestamp
657
        asf->packet_time_start = asf->packet_frag_offset;
658
        asf->packet_frag_offset = 0;
659
        asf->packet_frag_timestamp = asf->packet_timestamp;
660

    
661
        asf->packet_time_delta = get_byte(pb);
662
        rsize++;
663
    }else if(asf->packet_replic_size!=0){
664
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
665
        return -1;
666
    }
667
    if (asf->packet_flags & 0x01) {
668
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
669
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
670
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
671
            return -1;
672
        }
673
        //printf("Fragsize %d\n", asf->packet_frag_size);
674
    } else {
675
        asf->packet_frag_size = asf->packet_size_left - rsize;
676
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
677
    }
678
    if (asf->packet_replic_size == 1) {
679
        asf->packet_multi_size = asf->packet_frag_size;
680
        if (asf->packet_multi_size > asf->packet_size_left)
681
            return -1;
682
    }
683
    asf->packet_size_left -= rsize;
684
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
685

    
686
    return 0;
687
}
688

    
689
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
690
{
691
    ASFContext *asf = s->priv_data;
692
    ASFStream *asf_st = 0;
693
    ByteIOContext *pb = &s->pb;
694
    //static int pc = 0;
695
    for (;;) {
696
        if(url_feof(pb))
697
            return AVERROR_IO;
698
        if (asf->packet_size_left < FRAME_HEADER_SIZE
699
            || asf->packet_segments < 1) {
700
            //asf->packet_size_left <= asf->packet_padsize) {
701
            int ret = asf->packet_size_left + asf->packet_padsize;
702
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
703
            assert(ret>=0);
704
            /* fail safe */
705
            url_fskip(pb, ret);
706

    
707
            asf->packet_pos= url_ftell(&s->pb);
708
            if (asf->data_object_size != (uint64_t)-1 &&
709
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
710
                return AVERROR_IO; /* Do not exceed the size of the data object */
711
            ret = asf_get_packet(s);
712
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
713
            if (ret < 0)
714
                assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
715
            asf->packet_time_start = 0;
716
            continue;
717
        }
718
        if (asf->packet_time_start == 0) {
719
            if(asf_read_frame_header(s) < 0){
720
                asf->packet_segments= 0;
721
                continue;
722
            }
723
            if (asf->stream_index < 0
724
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
725
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
726
                ) {
727
                asf->packet_time_start = 0;
728
                /* unhandled packet (should not happen) */
729
                url_fskip(pb, asf->packet_frag_size);
730
                asf->packet_size_left -= asf->packet_frag_size;
731
                if(asf->stream_index < 0)
732
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
733
                continue;
734
            }
735
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
736
        }
737
        asf_st = asf->asf_st;
738

    
739
        if (asf->packet_replic_size == 1) {
740
            // frag_offset is here used as the begining timestamp
741
            asf->packet_frag_timestamp = asf->packet_time_start;
742
            asf->packet_time_start += asf->packet_time_delta;
743
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
744
            asf->packet_size_left--;
745
            asf->packet_multi_size--;
746
            if (asf->packet_multi_size < asf->packet_obj_size)
747
            {
748
                asf->packet_time_start = 0;
749
                url_fskip(pb, asf->packet_multi_size);
750
                asf->packet_size_left -= asf->packet_multi_size;
751
                continue;
752
            }
753
            asf->packet_multi_size -= asf->packet_obj_size;
754
            //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);
755
        }
756
        if (   asf_st->pkt.size != asf->packet_obj_size
757
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
758
            if(asf_st->pkt.data){
759
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
760
                asf_st->frag_offset = 0;
761
                av_free_packet(&asf_st->pkt);
762
            }
763
            /* new packet */
764
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
765
            asf_st->seq = asf->packet_seq;
766
            asf_st->pkt.pts = asf->packet_frag_timestamp;
767
            asf_st->pkt.stream_index = asf->stream_index;
768
            asf_st->pkt.pos =
769
            asf_st->packet_pos= asf->packet_pos;
770
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
771
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
772
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
773
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
774
                asf->packet_key_frame = 1;
775
            if (asf->packet_key_frame)
776
                asf_st->pkt.flags |= PKT_FLAG_KEY;
777
        }
778

    
779
        /* read data */
780
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
781
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
782
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
783
        asf->packet_size_left -= asf->packet_frag_size;
784
        if (asf->packet_size_left < 0)
785
            continue;
786

    
787
        if(   asf->packet_frag_offset >= asf_st->pkt.size
788
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
789
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
790
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
791
            continue;
792
        }
793

    
794
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
795
                   asf->packet_frag_size);
796
        asf_st->frag_offset += asf->packet_frag_size;
797
        /* test if whole packet is read */
798
        if (asf_st->frag_offset == asf_st->pkt.size) {
799
            /* return packet */
800
            if (asf_st->ds_span > 1) {
801
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
802
                    av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
803
              }else{
804
                /* packet descrambling */
805
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
806
                if (newdata) {
807
                    int offset = 0;
808
                    while (offset < asf_st->pkt.size) {
809
                        int off = offset / asf_st->ds_chunk_size;
810
                        int row = off / asf_st->ds_span;
811
                        int col = off % asf_st->ds_span;
812
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
813
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
814

    
815
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
816
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
817
                        memcpy(newdata + offset,
818
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
819
                               asf_st->ds_chunk_size);
820
                        offset += asf_st->ds_chunk_size;
821
                    }
822
                    av_free(asf_st->pkt.data);
823
                    asf_st->pkt.data = newdata;
824
                }
825
              }
826
            }
827
            asf_st->frag_offset = 0;
828
            *pkt= asf_st->pkt;
829
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
830
            asf_st->pkt.size = 0;
831
            asf_st->pkt.data = 0;
832
            break; // packet completed
833
        }
834
    }
835
    return 0;
836
}
837

    
838
static int asf_read_close(AVFormatContext *s)
839
{
840
    int i;
841

    
842
    for(i=0;i<s->nb_streams;i++) {
843
        AVStream *st = s->streams[i];
844
        av_free(st->priv_data);
845
        av_free(st->codec->palctrl);
846
    }
847
    return 0;
848
}
849

    
850
// Added to support seeking after packets have been read
851
// If information is not reset, read_packet fails due to
852
// leftover information from previous reads
853
static void asf_reset_header(AVFormatContext *s)
854
{
855
    ASFContext *asf = s->priv_data;
856
    ASFStream *asf_st;
857
    int i;
858

    
859
    asf->packet_nb_frames = 0;
860
    asf->packet_size_left = 0;
861
    asf->packet_segments = 0;
862
    asf->packet_flags = 0;
863
    asf->packet_property = 0;
864
    asf->packet_timestamp = 0;
865
    asf->packet_segsizetype = 0;
866
    asf->packet_segments = 0;
867
    asf->packet_seq = 0;
868
    asf->packet_replic_size = 0;
869
    asf->packet_key_frame = 0;
870
    asf->packet_padsize = 0;
871
    asf->packet_frag_offset = 0;
872
    asf->packet_frag_size = 0;
873
    asf->packet_frag_timestamp = 0;
874
    asf->packet_multi_size = 0;
875
    asf->packet_obj_size = 0;
876
    asf->packet_time_delta = 0;
877
    asf->packet_time_start = 0;
878

    
879
    for(i=0; i<s->nb_streams; i++){
880
        asf_st= s->streams[i]->priv_data;
881
        av_free_packet(&asf_st->pkt);
882
        asf_st->frag_offset=0;
883
        asf_st->seq=0;
884
    }
885
    asf->asf_st= NULL;
886
}
887

    
888
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
889
{
890
    ASFContext *asf = s->priv_data;
891
    AVPacket pkt1, *pkt = &pkt1;
892
    ASFStream *asf_st;
893
    int64_t pts;
894
    int64_t pos= *ppos;
895
    int i;
896
    int64_t start_pos[s->nb_streams];
897

    
898
    for(i=0; i<s->nb_streams; i++){
899
        start_pos[i]= pos;
900
    }
901

    
902
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
903
    *ppos= pos;
904
    url_fseek(&s->pb, pos, SEEK_SET);
905

    
906
//printf("asf_read_pts\n");
907
    asf_reset_header(s);
908
    for(;;){
909
        if (av_read_frame(s, pkt) < 0){
910
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
911
            return AV_NOPTS_VALUE;
912
        }
913

    
914
        pts= pkt->pts;
915

    
916
        av_free_packet(pkt);
917
        if(pkt->flags&PKT_FLAG_KEY){
918
            i= pkt->stream_index;
919

    
920
            asf_st= s->streams[i]->priv_data;
921

    
922
//            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
923
            pos= asf_st->packet_pos;
924

    
925
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
926
            start_pos[i]= asf_st->packet_pos + 1;
927

    
928
            if(pkt->stream_index == stream_index)
929
               break;
930
        }
931
    }
932

    
933
    *ppos= pos;
934
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
935

    
936
    return pts;
937
}
938

    
939
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
940
{
941
    GUID g;
942
    ASFContext *asf = s->priv_data;
943
    int64_t gsize, itime;
944
    int64_t pos, current_pos, index_pts;
945
    int i;
946
    int pct,ict;
947

    
948
    current_pos = url_ftell(&s->pb);
949

    
950
    url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
951
    get_guid(&s->pb, &g);
952
    if (!memcmp(&g, &index_guid, sizeof(GUID))) {
953
        gsize = get_le64(&s->pb);
954
        get_guid(&s->pb, &g);
955
        itime=get_le64(&s->pb);
956
        pct=get_le32(&s->pb);
957
        ict=get_le32(&s->pb);
958
        av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
959

    
960
        for (i=0;i<ict;i++){
961
            int pktnum=get_le32(&s->pb);
962
            int pktct =get_le16(&s->pb);
963
            av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
964

    
965
            pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
966
            index_pts=av_rescale(itime, i, 10000);
967

    
968
            av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
969
        }
970
        asf->index_read= 1;
971
    }
972
    url_fseek(&s->pb, current_pos, SEEK_SET);
973
}
974

    
975
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
976
{
977
    ASFContext *asf = s->priv_data;
978
    AVStream *st = s->streams[stream_index];
979
    int64_t pos;
980
    int index;
981

    
982
    if (asf->packet_size <= 0)
983
        return -1;
984

    
985
    if (!asf->index_read)
986
        asf_build_simple_index(s, stream_index);
987

    
988
    if(!(asf->index_read && st->index_entries)){
989
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
990
            return -1;
991
    }else{
992
        index= av_index_search_timestamp(st, pts, flags);
993
        if(index<0)
994
            return -1;
995

    
996
        /* find the position */
997
        pos = st->index_entries[index].pos;
998
        pts = st->index_entries[index].timestamp;
999

    
1000
    // various attempts to find key frame have failed so far
1001
    //    asf_reset_header(s);
1002
    //    url_fseek(&s->pb, pos, SEEK_SET);
1003
    //    key_pos = pos;
1004
    //     for(i=0;i<16;i++){
1005
    //         pos = url_ftell(&s->pb);
1006
    //         if (av_read_frame(s, &pkt) < 0){
1007
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1008
    //             return -1;
1009
    //         }
1010
    //         asf_st = s->streams[stream_index]->priv_data;
1011
    //         pos += st->parser->frame_offset;
1012
    //
1013
    //         if (pkt.size > b) {
1014
    //             b = pkt.size;
1015
    //             key_pos = pos;
1016
    //         }
1017
    //
1018
    //         av_free_packet(&pkt);
1019
    //     }
1020

    
1021
        /* do the seek */
1022
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1023
        url_fseek(&s->pb, pos, SEEK_SET);
1024
    }
1025
    asf_reset_header(s);
1026
    return 0;
1027
}
1028

    
1029
AVInputFormat asf_demuxer = {
1030
    "asf",
1031
    "asf format",
1032
    sizeof(ASFContext),
1033
    asf_probe,
1034
    asf_read_header,
1035
    asf_read_packet,
1036
    asf_read_close,
1037
    asf_read_seek,
1038
    asf_read_pts,
1039
};