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ffmpeg / libavformat / asf.c @ b83e83b9

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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
71
        printf("(GUID: unknown) ");
72
    for(i=0;i<16;i++)
73
        printf(" 0x%02x,", (*g)[i]);
74
    printf("}\n");
75
}
76
#undef PRINT_IF_GUID
77
#endif
78

    
79
static void get_guid(ByteIOContext *s, GUID *g)
80
{
81
    assert(sizeof(*g) == 16);
82
    get_buffer(s, g, sizeof(*g));
83
}
84

    
85
#if 0
86
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
87
{
88
    int len, c;
89
    char *q;
90

91
    len = get_le16(pb);
92
    q = buf;
93
    while (len > 0) {
94
        c = get_le16(pb);
95
        if ((q - buf) < buf_size - 1)
96
            *q++ = c;
97
        len--;
98
    }
99
    *q = '\0';
100
}
101
#endif
102

    
103
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
104
{
105
    char* q = buf;
106
    len /= 2;
107
    while (len--) {
108
        uint8_t tmp;
109
        PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
110
    }
111
    *q = '\0';
112
}
113

    
114
static int asf_probe(AVProbeData *pd)
115
{
116
    /* check file header */
117
    if (pd->buf_size <= 32)
118
        return 0;
119

    
120
    if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
121
        return AVPROBE_SCORE_MAX;
122
    else
123
        return 0;
124
}
125

    
126
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
127
{
128
    ASFContext *asf = s->priv_data;
129
    GUID g;
130
    ByteIOContext *pb = &s->pb;
131
    AVStream *st;
132
    ASFStream *asf_st;
133
    int size, i;
134
    int64_t gsize;
135

    
136
    get_guid(pb, &g);
137
    if (memcmp(&g, &asf_header, sizeof(GUID)))
138
        goto fail;
139
    get_le64(pb);
140
    get_le32(pb);
141
    get_byte(pb);
142
    get_byte(pb);
143
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
144
    for(;;) {
145
        get_guid(pb, &g);
146
        gsize = get_le64(pb);
147
#ifdef DEBUG
148
        printf("%08"PRIx64": ", url_ftell(pb) - 24);
149
        print_guid(&g);
150
        printf("  size=0x%"PRIx64"\n", gsize);
151
#endif
152
        if (gsize < 24)
153
            goto fail;
154
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
155
            get_guid(pb, &asf->hdr.guid);
156
            asf->hdr.file_size          = get_le64(pb);
157
            asf->hdr.create_time        = get_le64(pb);
158
            asf->hdr.packets_count      = get_le64(pb);
159
            asf->hdr.send_time          = get_le64(pb);
160
            asf->hdr.play_time          = get_le64(pb);
161
            asf->hdr.preroll            = get_le32(pb);
162
            asf->hdr.ignore             = get_le32(pb);
163
            asf->hdr.flags              = get_le32(pb);
164
            asf->hdr.min_pktsize        = get_le32(pb);
165
            asf->hdr.max_pktsize        = get_le32(pb);
166
            asf->hdr.max_bitrate        = get_le32(pb);
167
            asf->packet_size = asf->hdr.max_pktsize;
168
            asf->nb_packets = asf->hdr.packets_count;
169
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
170
            int type, type_specific_size, sizeX;
171
            uint64_t total_size;
172
            unsigned int tag1;
173
            int64_t pos1, pos2;
174
            int test_for_ext_stream_audio;
175

    
176
            pos1 = url_ftell(pb);
177

    
178
            st = av_new_stream(s, 0);
179
            if (!st)
180
                goto fail;
181
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
182
            asf_st = av_mallocz(sizeof(ASFStream));
183
            if (!asf_st)
184
                goto fail;
185
            st->priv_data = asf_st;
186
            st->start_time = asf->hdr.preroll;
187
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
188
                st->duration = asf->hdr.send_time /
189
                    (10000000 / 1000) - st->start_time;
190
            }
191
            get_guid(pb, &g);
192

    
193
            test_for_ext_stream_audio = 0;
194
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
195
                type = CODEC_TYPE_AUDIO;
196
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
197
                type = CODEC_TYPE_VIDEO;
198
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
199
                type = CODEC_TYPE_UNKNOWN;
200
            } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
201
                test_for_ext_stream_audio = 1;
202
                type = CODEC_TYPE_UNKNOWN;
203
            } else {
204
                goto fail;
205
            }
206
            get_guid(pb, &g);
207
            total_size = get_le64(pb);
208
            type_specific_size = get_le32(pb);
209
            get_le32(pb);
210
            st->id = get_le16(pb) & 0x7f; /* stream id */
211
            // mapping of asf ID to AV stream ID;
212
            asf->asfid2avid[st->id] = s->nb_streams - 1;
213

    
214
            get_le32(pb);
215

    
216
            if (test_for_ext_stream_audio) {
217
                get_guid(pb, &g);
218
                if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
219
                    type = CODEC_TYPE_AUDIO;
220
                    get_guid(pb, &g);
221
                    get_le32(pb);
222
                    get_le32(pb);
223
                    get_le32(pb);
224
                    get_guid(pb, &g);
225
                    get_le32(pb);
226
                }
227
            }
228

    
229
            st->codec->codec_type = type;
230
            if (type == CODEC_TYPE_AUDIO) {
231
                get_wav_header(pb, st->codec, type_specific_size);
232
                st->need_parsing = 1;
233
                /* We have to init the frame size at some point .... */
234
                pos2 = url_ftell(pb);
235
                if (gsize > (pos2 + 8 - pos1 + 24)) {
236
                    asf_st->ds_span = get_byte(pb);
237
                    asf_st->ds_packet_size = get_le16(pb);
238
                    asf_st->ds_chunk_size = get_le16(pb);
239
                    asf_st->ds_data_size = get_le16(pb);
240
                    asf_st->ds_silence_data = get_byte(pb);
241
                }
242
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
243
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
244
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
245
                if (asf_st->ds_span > 1) {
246
                    if (!asf_st->ds_chunk_size
247
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
248
                        asf_st->ds_span = 0; // disable descrambling
249
                }
250
                switch (st->codec->codec_id) {
251
                case CODEC_ID_MP3:
252
                    st->codec->frame_size = MPA_FRAME_SIZE;
253
                    break;
254
                case CODEC_ID_PCM_S16LE:
255
                case CODEC_ID_PCM_S16BE:
256
                case CODEC_ID_PCM_U16LE:
257
                case CODEC_ID_PCM_U16BE:
258
                case CODEC_ID_PCM_S8:
259
                case CODEC_ID_PCM_U8:
260
                case CODEC_ID_PCM_ALAW:
261
                case CODEC_ID_PCM_MULAW:
262
                    st->codec->frame_size = 1;
263
                    break;
264
                default:
265
                    /* This is probably wrong, but it prevents a crash later */
266
                    st->codec->frame_size = 1;
267
                    break;
268
                }
269
            } else if (type == CODEC_TYPE_VIDEO) {
270
                get_le32(pb);
271
                get_le32(pb);
272
                get_byte(pb);
273
                size = get_le16(pb); /* size */
274
                sizeX= get_le32(pb); /* size */
275
                st->codec->width = get_le32(pb);
276
                st->codec->height = get_le32(pb);
277
                /* not available for asf */
278
                get_le16(pb); /* panes */
279
                st->codec->bits_per_sample = get_le16(pb); /* depth */
280
                tag1 = get_le32(pb);
281
                url_fskip(pb, 20);
282
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
283
                size= sizeX;
284
                if (size > 40) {
285
                    st->codec->extradata_size = size - 40;
286
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
287
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
288
                }
289

    
290
        /* Extract palette from extradata if bpp <= 8 */
291
        /* This code assumes that extradata contains only palette */
292
        /* This is true for all paletted codecs implemented in ffmpeg */
293
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
294
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
295
#ifdef WORDS_BIGENDIAN
296
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
297
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
298
#else
299
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
300
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
301
#endif
302
            st->codec->palctrl->palette_changed = 1;
303
        }
304

    
305
                st->codec->codec_tag = tag1;
306
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
307
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
308
                    st->need_parsing = 1;
309
            }
310
            pos2 = url_ftell(pb);
311
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
312
        } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
313
            asf->data_object_offset = url_ftell(pb);
314
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
315
            if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
316
                asf->data_object_size = gsize - 24;
317
            } else {
318
                asf->data_object_size = (uint64_t)-1;
319
            }
320
            break;
321
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
322
            int len1, len2, len3, len4, len5;
323

    
324
            len1 = get_le16(pb);
325
            len2 = get_le16(pb);
326
            len3 = get_le16(pb);
327
            len4 = get_le16(pb);
328
            len5 = get_le16(pb);
329
            get_str16_nolen(pb, len1, s->title, sizeof(s->title));
330
            get_str16_nolen(pb, len2, s->author, sizeof(s->author));
331
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
332
            get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
333
            url_fskip(pb, len5);
334
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
335
                int desc_count, i;
336

    
337
                desc_count = get_le16(pb);
338
                for(i=0;i<desc_count;i++)
339
                {
340
                        int name_len,value_type,value_len;
341
                        uint64_t value_num = 0;
342
                        char *name, *value;
343

    
344
                        name_len = get_le16(pb);
345
                        name = av_malloc(name_len * 2);
346
                        get_str16_nolen(pb, name_len, name, name_len * 2);
347
                        value_type = get_le16(pb);
348
                        value_len = get_le16(pb);
349
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
350
                        {
351
                                value = av_malloc(value_len * 2);
352
                                get_str16_nolen(pb, value_len, value,
353
                                        value_len * 2);
354
                                if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
355
                                if (strcmp(name,"WM/Genre")==0) { pstrcpy(s->genre, sizeof(s->genre), value); }
356
                                av_free(value);
357
                        }
358
                        if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
359
                        {
360
                                if (value_type==2) value_num = get_le32(pb);
361
                                if (value_type==3) value_num = get_le32(pb);
362
                                if (value_type==4) value_num = get_le64(pb);
363
                                if (value_type==5) value_num = get_le16(pb);
364
                                if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
365
                                if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
366
                        }
367
                        av_free(name);
368
                }
369
        } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
370
            int ext_len, payload_ext_ct, stream_ct;
371
            uint32_t ext_d;
372
            int64_t pos_ex_st;
373
            pos_ex_st = url_ftell(pb);
374

    
375
            get_le64(pb);
376
            get_le64(pb);
377
            get_le32(pb);
378
            get_le32(pb);
379
            get_le32(pb);
380
            get_le32(pb);
381
            get_le32(pb);
382
            get_le32(pb);
383
            get_le32(pb);
384
            get_le32(pb);
385
            get_le16(pb);
386
            get_le16(pb);
387
            get_le64(pb);
388
            stream_ct = get_le16(pb);
389
            payload_ext_ct = get_le16(pb);
390

    
391
            for (i=0; i<stream_ct; i++){
392
                get_le16(pb);
393
                ext_len = get_le16(pb);
394
                url_fseek(pb, ext_len, SEEK_CUR);
395
            }
396

    
397
            for (i=0; i<payload_ext_ct; i++){
398
                get_guid(pb, &g);
399
                ext_d=get_le16(pb);
400
                ext_len=get_le32(pb);
401
                url_fseek(pb, ext_len, SEEK_CUR);
402
            }
403

    
404
            // there could be a optional stream properties object to follow
405
            // if so the next iteration will pick it up
406
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
407
            int v1, v2;
408
            get_guid(pb, &g);
409
            v1 = get_le32(pb);
410
            v2 = get_le16(pb);
411
#if 0
412
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
413
            int len, v1, n, num;
414
            char str[256], *q;
415
            char tag[16];
416

417
            get_guid(pb, &g);
418
            print_guid(&g);
419

420
            n = get_le32(pb);
421
            for(i=0;i<n;i++) {
422
                num = get_le16(pb); /* stream number */
423
                get_str16(pb, str, sizeof(str));
424
                get_str16(pb, str, sizeof(str));
425
                len = get_le16(pb);
426
                q = tag;
427
                while (len > 0) {
428
                    v1 = get_byte(pb);
429
                    if ((q - tag) < sizeof(tag) - 1)
430
                        *q++ = v1;
431
                    len--;
432
                }
433
                *q = '\0';
434
            }
435
#endif
436
        } else if (url_feof(pb)) {
437
            goto fail;
438
        } else {
439
            url_fseek(pb, gsize - 24, SEEK_CUR);
440
        }
441
    }
442
    get_guid(pb, &g);
443
    get_le64(pb);
444
    get_byte(pb);
445
    get_byte(pb);
446
    if (url_feof(pb))
447
        goto fail;
448
    asf->data_offset = url_ftell(pb);
449
    asf->packet_size_left = 0;
450

    
451
    return 0;
452

    
453
 fail:
454
     for(i=0;i<s->nb_streams;i++) {
455
        AVStream *st = s->streams[i];
456
        if (st) {
457
            av_free(st->priv_data);
458
            av_free(st->codec->extradata);
459
        }
460
        av_free(st);
461
    }
462
    return -1;
463
}
464

    
465
#define DO_2BITS(bits, var, defval) \
466
    switch (bits & 3) \
467
    { \
468
    case 3: var = get_le32(pb); rsize += 4; break; \
469
    case 2: var = get_le16(pb); rsize += 2; break; \
470
    case 1: var = get_byte(pb); rsize++; break; \
471
    default: var = defval; break; \
472
    }
473

    
474
static int asf_get_packet(AVFormatContext *s)
475
{
476
    ASFContext *asf = s->priv_data;
477
    ByteIOContext *pb = &s->pb;
478
    uint32_t packet_length, padsize;
479
    int rsize = 9;
480
    int c;
481

    
482
    assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
483

    
484
    c = get_byte(pb);
485
    if (c != 0x82) {
486
        if (!url_feof(pb))
487
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
488
    }
489
    if ((c & 0x0f) == 2) { // always true for now
490
        if (get_le16(pb) != 0) {
491
            if (!url_feof(pb))
492
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
493
            return AVERROR_IO;
494
        }
495
        rsize+=2;
496
/*    }else{
497
        if (!url_feof(pb))
498
            printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
499
        return AVERROR_IO;*/
500
    }
501

    
502
    asf->packet_flags = get_byte(pb);
503
    asf->packet_property = get_byte(pb);
504

    
505
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
506
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
507
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
508

    
509
    //the following checks prevent overflows and infinite loops
510
    if(packet_length >= (1U<<29)){
511
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
512
        return 0; // FIXME this should be -1
513
    }
514
    if(padsize >= (1U<<29)){
515
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
516
        return 0; // FIXME this should be -1
517
    }
518

    
519
    asf->packet_timestamp = get_le32(pb);
520
    get_le16(pb); /* duration */
521
    // rsize has at least 11 bytes which have to be present
522

    
523
    if (asf->packet_flags & 0x01) {
524
        asf->packet_segsizetype = get_byte(pb); rsize++;
525
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
526
    } else {
527
        asf->packet_segments = 1;
528
        asf->packet_segsizetype = 0x80;
529
    }
530
    asf->packet_size_left = packet_length - padsize - rsize;
531
    if (packet_length < asf->hdr.min_pktsize)
532
        padsize += asf->hdr.min_pktsize - packet_length;
533
    asf->packet_padsize = padsize;
534
#ifdef DEBUG
535
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
536
#endif
537
    return 0;
538
}
539

    
540
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
541
{
542
    ASFContext *asf = s->priv_data;
543
    ASFStream *asf_st = 0;
544
    ByteIOContext *pb = &s->pb;
545
    //static int pc = 0;
546
    for (;;) {
547
        int rsize = 0;
548
        if (asf->packet_size_left < FRAME_HEADER_SIZE
549
            || asf->packet_segments < 1) {
550
            //asf->packet_size_left <= asf->packet_padsize) {
551
            int ret = asf->packet_size_left + asf->packet_padsize;
552
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
553
            if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
554
                ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
555
            assert(ret>=0);
556
            /* fail safe */
557
            url_fskip(pb, ret);
558
            asf->packet_pos= url_ftell(&s->pb);
559
            if (asf->data_object_size != (uint64_t)-1 &&
560
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
561
                return AVERROR_IO; /* Do not exceed the size of the data object */
562
            ret = asf_get_packet(s);
563
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
564
            if (ret < 0 || url_feof(pb))
565
                return AVERROR_IO;
566
            asf->packet_time_start = 0;
567
            continue;
568
        }
569
        if (asf->packet_time_start == 0) {
570
            /* read frame header */
571
            int num = get_byte(pb);
572
            asf->packet_segments--;
573
            rsize++;
574
            asf->packet_key_frame = num >> 7;
575
            asf->stream_index = asf->asfid2avid[num & 0x7f];
576
            // sequence should be ignored!
577
            DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
578
            DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
579
            DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
580
//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);
581
            if (asf->packet_replic_size >= 8) {
582
                asf->packet_obj_size = get_le32(pb);
583
                if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
584
                    av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
585
                    continue;
586
                }
587
                asf->packet_frag_timestamp = get_le32(pb); // timestamp
588
                url_fskip(pb, asf->packet_replic_size - 8);
589
                rsize += asf->packet_replic_size; // FIXME - check validity
590
            } else if (asf->packet_replic_size==1){
591
                // multipacket - frag_offset is begining timestamp
592
                asf->packet_time_start = asf->packet_frag_offset;
593
                asf->packet_frag_offset = 0;
594
                asf->packet_frag_timestamp = asf->packet_timestamp;
595

    
596
                asf->packet_time_delta = get_byte(pb);
597
                rsize++;
598
            }else if(asf->packet_replic_size!=0){
599
                av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
600
                continue;
601
            }
602
            if (asf->packet_flags & 0x01) {
603
                DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
604
#undef DO_2BITS
605
                //printf("Fragsize %d\n", asf->packet_frag_size);
606
            } else {
607
                asf->packet_frag_size = asf->packet_size_left - rsize;
608
                //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
609
            }
610
            if (asf->packet_replic_size == 1) {
611
                asf->packet_multi_size = asf->packet_frag_size;
612
                if (asf->packet_multi_size > asf->packet_size_left) {
613
                    asf->packet_segments = 0;
614
                    continue;
615
                }
616
            }
617
            asf->packet_size_left -= rsize;
618
            //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
619

    
620
            if (asf->stream_index < 0
621
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
622
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
623
                ) {
624
                asf->packet_time_start = 0;
625
                /* unhandled packet (should not happen) */
626
                url_fskip(pb, asf->packet_frag_size);
627
                asf->packet_size_left -= asf->packet_frag_size;
628
                if(asf->stream_index < 0)
629
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
630
                continue;
631
            }
632
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
633
        }
634
        asf_st = asf->asf_st;
635

    
636
        if ((asf->packet_frag_offset != asf_st->frag_offset
637
             || (asf->packet_frag_offset
638
                 && asf->packet_seq != asf_st->seq)) // seq should be ignored
639
           ) {
640
            /* cannot continue current packet: free it */
641
            // FIXME better check if packet was already allocated
642
            av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
643
                   asf_st->pkt.size,
644
                   asf->packet_obj_size,
645
                   asf->packet_frag_offset, asf_st->frag_offset,
646
                   asf->packet_seq, asf_st->seq, asf->packet_frag_size);
647
            if (asf_st->pkt.size)
648
                av_free_packet(&asf_st->pkt);
649
            asf_st->frag_offset = 0;
650
            if (asf->packet_frag_offset != 0) {
651
                url_fskip(pb, asf->packet_frag_size);
652
                av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
653
                asf->packet_size_left -= asf->packet_frag_size;
654
                continue;
655
            }
656
        }
657
        if (asf->packet_replic_size == 1) {
658
            // frag_offset is here used as the begining timestamp
659
            asf->packet_frag_timestamp = asf->packet_time_start;
660
            asf->packet_time_start += asf->packet_time_delta;
661
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
662
            asf->packet_size_left--;
663
            asf->packet_multi_size--;
664
            if (asf->packet_multi_size < asf->packet_obj_size)
665
            {
666
                asf->packet_time_start = 0;
667
                url_fskip(pb, asf->packet_multi_size);
668
                asf->packet_size_left -= asf->packet_multi_size;
669
                continue;
670
            }
671
            asf->packet_multi_size -= asf->packet_obj_size;
672
            //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);
673
        }
674
        if (asf_st->frag_offset == 0) {
675
            /* new packet */
676
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
677
            asf_st->seq = asf->packet_seq;
678
            asf_st->pkt.pts = asf->packet_frag_timestamp;
679
            asf_st->pkt.stream_index = asf->stream_index;
680
            asf_st->pkt.pos =
681
            asf_st->packet_pos= asf->packet_pos;
682
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
683
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
684
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
685
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
686
                asf->packet_key_frame = 1;
687
            if (asf->packet_key_frame)
688
                asf_st->pkt.flags |= PKT_FLAG_KEY;
689
        }
690

    
691
        /* read data */
692
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
693
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
694
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
695
        asf->packet_size_left -= asf->packet_frag_size;
696
        if (asf->packet_size_left < 0)
697
            continue;
698
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
699
                   asf->packet_frag_size);
700
        asf_st->frag_offset += asf->packet_frag_size;
701
        /* test if whole packet is read */
702
        if (asf_st->frag_offset == asf_st->pkt.size) {
703
            /* return packet */
704
            if (asf_st->ds_span > 1) {
705
                /* packet descrambling */
706
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
707
                if (newdata) {
708
                    int offset = 0;
709
                    while (offset < asf_st->pkt.size) {
710
                        int off = offset / asf_st->ds_chunk_size;
711
                        int row = off / asf_st->ds_span;
712
                        int col = off % asf_st->ds_span;
713
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
714
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
715
                        memcpy(newdata + offset,
716
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
717
                               asf_st->ds_chunk_size);
718
                        offset += asf_st->ds_chunk_size;
719
                    }
720
                    av_free(asf_st->pkt.data);
721
                    asf_st->pkt.data = newdata;
722
                }
723
            }
724
            asf_st->frag_offset = 0;
725
            *pkt= asf_st->pkt;
726
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
727
            asf_st->pkt.size = 0;
728
            asf_st->pkt.data = 0;
729
            break; // packet completed
730
        }
731
    }
732
    return 0;
733
}
734

    
735
static int asf_read_close(AVFormatContext *s)
736
{
737
    int i;
738

    
739
    for(i=0;i<s->nb_streams;i++) {
740
        AVStream *st = s->streams[i];
741
        av_free(st->priv_data);
742
    av_free(st->codec->palctrl);
743
    }
744
    return 0;
745
}
746

    
747
// Added to support seeking after packets have been read
748
// If information is not reset, read_packet fails due to
749
// leftover information from previous reads
750
static void asf_reset_header(AVFormatContext *s)
751
{
752
    ASFContext *asf = s->priv_data;
753
    ASFStream *asf_st;
754
    int i;
755

    
756
    asf->packet_nb_frames = 0;
757
    asf->packet_size_left = 0;
758
    asf->packet_segments = 0;
759
    asf->packet_flags = 0;
760
    asf->packet_property = 0;
761
    asf->packet_timestamp = 0;
762
    asf->packet_segsizetype = 0;
763
    asf->packet_segments = 0;
764
    asf->packet_seq = 0;
765
    asf->packet_replic_size = 0;
766
    asf->packet_key_frame = 0;
767
    asf->packet_padsize = 0;
768
    asf->packet_frag_offset = 0;
769
    asf->packet_frag_size = 0;
770
    asf->packet_frag_timestamp = 0;
771
    asf->packet_multi_size = 0;
772
    asf->packet_obj_size = 0;
773
    asf->packet_time_delta = 0;
774
    asf->packet_time_start = 0;
775

    
776
    for(i=0; i<s->nb_streams; i++){
777
        asf_st= s->streams[i]->priv_data;
778
        av_free_packet(&asf_st->pkt);
779
        asf_st->frag_offset=0;
780
        asf_st->seq=0;
781
    }
782
    asf->asf_st= NULL;
783
}
784

    
785
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
786
{
787
    ASFContext *asf = s->priv_data;
788
    AVPacket pkt1, *pkt = &pkt1;
789
    ASFStream *asf_st;
790
    int64_t pts;
791
    int64_t pos= *ppos;
792
    int i;
793
    int64_t start_pos[s->nb_streams];
794

    
795
    for(i=0; i<s->nb_streams; i++){
796
        start_pos[i]= pos;
797
    }
798

    
799
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
800
    *ppos= pos;
801
    url_fseek(&s->pb, pos, SEEK_SET);
802

    
803
//printf("asf_read_pts\n");
804
    asf_reset_header(s);
805
    for(;;){
806
        if (av_read_frame(s, pkt) < 0){
807
            av_log(s, AV_LOG_INFO, "seek failed\n");
808
            return AV_NOPTS_VALUE;
809
        }
810

    
811
        pts= pkt->pts;
812

    
813
        av_free_packet(pkt);
814
        if(pkt->flags&PKT_FLAG_KEY){
815
            i= pkt->stream_index;
816

    
817
            asf_st= s->streams[i]->priv_data;
818

    
819
            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
820
            pos= asf_st->packet_pos;
821

    
822
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
823
            start_pos[i]= asf_st->packet_pos + 1;
824

    
825
            if(pkt->stream_index == stream_index)
826
               break;
827
        }
828
    }
829

    
830
    *ppos= pos;
831
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
832

    
833
    return pts;
834
}
835

    
836
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
837
{
838
    GUID g;
839
    ASFContext *asf = s->priv_data;
840
    int64_t gsize, itime;
841
    int64_t pos, current_pos, index_pts;
842
    int i;
843
    int pct,ict;
844

    
845
    current_pos = url_ftell(&s->pb);
846

    
847
    url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
848
    get_guid(&s->pb, &g);
849
    if (!memcmp(&g, &index_guid, sizeof(GUID))) {
850
        gsize = get_le64(&s->pb);
851
        get_guid(&s->pb, &g);
852
        itime=get_le64(&s->pb);
853
        pct=get_le32(&s->pb);
854
        ict=get_le32(&s->pb);
855
        av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
856

    
857
        for (i=0;i<ict;i++){
858
            int pktnum=get_le32(&s->pb);
859
            int pktct =get_le16(&s->pb);
860
            av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
861

    
862
            pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
863
            index_pts=av_rescale(itime, i, 10000);
864

    
865
            av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
866
        }
867
        asf->index_read= 1;
868
    }
869
    url_fseek(&s->pb, current_pos, SEEK_SET);
870
}
871

    
872
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
873
{
874
    ASFContext *asf = s->priv_data;
875
    AVStream *st = s->streams[stream_index];
876
    int64_t pos;
877
    int index;
878

    
879
    if (asf->packet_size <= 0)
880
        return -1;
881

    
882
    if (!asf->index_read)
883
        asf_build_simple_index(s, stream_index);
884

    
885
    if(!(asf->index_read && st->index_entries)){
886
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
887
            return -1;
888
    }else{
889
        index= av_index_search_timestamp(st, pts, flags);
890
        if(index<0)
891
            return -1;
892

    
893
        /* find the position */
894
        pos = st->index_entries[index].pos;
895
        pts = st->index_entries[index].timestamp;
896

    
897
    // various attempts to find key frame have failed so far
898
    //    asf_reset_header(s);
899
    //    url_fseek(&s->pb, pos, SEEK_SET);
900
    //    key_pos = pos;
901
    //     for(i=0;i<16;i++){
902
    //         pos = url_ftell(&s->pb);
903
    //         if (av_read_frame(s, &pkt) < 0){
904
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
905
    //             return -1;
906
    //         }
907
    //         asf_st = s->streams[stream_index]->priv_data;
908
    //         pos += st->parser->frame_offset;
909
    //
910
    //         if (pkt.size > b) {
911
    //             b = pkt.size;
912
    //             key_pos = pos;
913
    //         }
914
    //
915
    //         av_free_packet(&pkt);
916
    //     }
917

    
918
        /* do the seek */
919
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
920
        url_fseek(&s->pb, pos, SEEK_SET);
921
    }
922
    asf_reset_header(s);
923
    return 0;
924
}
925

    
926
AVInputFormat asf_demuxer = {
927
    "asf",
928
    "asf format",
929
    sizeof(ASFContext),
930
    asf_probe,
931
    asf_read_header,
932
    asf_read_packet,
933
    asf_read_close,
934
    asf_read_seek,
935
    asf_read_pts,
936
};