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ffmpeg / libavformat / asf.c @ f3356e9c

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1
/*
2
 * ASF compatible decoder.
3
 * Copyright (c) 2000, 2001 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avformat.h"
20
#include "avi.h"
21
#include "mpegaudio.h"
22
#include "asf.h"
23

    
24
#undef NDEBUG
25
#include <assert.h>
26

    
27
#define FRAME_HEADER_SIZE 17
28
// Fix Me! FRAME_HEADER_SIZE may be different. 
29

    
30
static const GUID index_guid = {
31
    0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
32
};
33

    
34
/**********************************/
35
/* decoding */
36

    
37
//#define DEBUG
38

    
39
#ifdef DEBUG
40
#define PRINT_IF_GUID(g,cmp) \
41
if (!memcmp(g, &cmp, sizeof(GUID))) \
42
    printf("(GUID: %s) ", #cmp)
43

    
44
static void print_guid(const GUID *g)
45
{
46
    int i;
47
    PRINT_IF_GUID(g, asf_header);
48
    else PRINT_IF_GUID(g, file_header);
49
    else PRINT_IF_GUID(g, stream_header);
50
    else PRINT_IF_GUID(g, audio_stream);
51
    else PRINT_IF_GUID(g, audio_conceal_none);
52
    else PRINT_IF_GUID(g, video_stream);
53
    else PRINT_IF_GUID(g, video_conceal_none);
54
    else PRINT_IF_GUID(g, comment_header);
55
    else PRINT_IF_GUID(g, codec_comment_header);
56
    else PRINT_IF_GUID(g, codec_comment1_header);
57
    else PRINT_IF_GUID(g, data_header);
58
    else PRINT_IF_GUID(g, index_guid);
59
    else PRINT_IF_GUID(g, head1_guid);
60
    else PRINT_IF_GUID(g, head2_guid);
61
    else PRINT_IF_GUID(g, my_guid);
62
    else
63
        printf("(GUID: unknown) ");
64
    printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
65
    for(i=0;i<8;i++)
66
        printf(" 0x%02x,", g->v4[i]);
67
    printf("}\n");
68
}
69
#undef PRINT_IF_GUID(g,cmp)
70
#endif
71

    
72
static void get_guid(ByteIOContext *s, GUID *g)
73
{
74
    int i;
75

    
76
    g->v1 = get_le32(s);
77
    g->v2 = get_le16(s);
78
    g->v3 = get_le16(s);
79
    for(i=0;i<8;i++)
80
        g->v4[i] = get_byte(s);
81
}
82

    
83
#if 0
84
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
85
{
86
    int len, c;
87
    char *q;
88

89
    len = get_le16(pb);
90
    q = buf;
91
    while (len > 0) {
92
        c = get_le16(pb);
93
        if ((q - buf) < buf_size - 1)
94
            *q++ = c;
95
        len--;
96
    }
97
    *q = '\0';
98
}
99
#endif
100

    
101
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
102
{
103
    int c;
104
    char *q;
105

    
106
    q = buf;
107
    while (len > 0) {
108
        c = get_le16(pb);
109
        if ((q - buf) < buf_size - 1)
110
            *q++ = c;
111
        len-=2;
112
    }
113
    *q = '\0';
114
}
115

    
116
static int asf_probe(AVProbeData *pd)
117
{
118
    GUID g;
119
    const unsigned char *p;
120
    int i;
121

    
122
    /* check file header */
123
    if (pd->buf_size <= 32)
124
        return 0;
125
    p = pd->buf;
126
    g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
127
    p += 4;
128
    g.v2 = p[0] | (p[1] << 8);
129
    p += 2;
130
    g.v3 = p[0] | (p[1] << 8);
131
    p += 2;
132
    for(i=0;i<8;i++)
133
        g.v4[i] = *p++;
134

    
135
    if (!memcmp(&g, &asf_header, sizeof(GUID)))
136
        return AVPROBE_SCORE_MAX;
137
    else
138
        return 0;
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

    
151
    get_guid(pb, &g);
152
    if (memcmp(&g, &asf_header, sizeof(GUID)))
153
        goto fail;
154
    get_le64(pb);
155
    get_le32(pb);
156
    get_byte(pb);
157
    get_byte(pb);
158
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
159
    for(;;) {
160
        get_guid(pb, &g);
161
        gsize = get_le64(pb);
162
#ifdef DEBUG
163
        printf("%08Lx: ", url_ftell(pb) - 24);
164
        print_guid(&g);
165
        printf("  size=0x%Lx\n", gsize);
166
#endif
167
        if (gsize < 24)
168
            goto fail;
169
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
170
            get_guid(pb, &asf->hdr.guid);
171
            asf->hdr.file_size                = get_le64(pb);
172
            asf->hdr.create_time        = get_le64(pb);
173
            asf->hdr.packets_count        = get_le64(pb);
174
            asf->hdr.play_time                = get_le64(pb);
175
            asf->hdr.send_time                = get_le64(pb);
176
            asf->hdr.preroll                = get_le32(pb);
177
            asf->hdr.ignore                = get_le32(pb);
178
            asf->hdr.flags                = get_le32(pb);
179
            asf->hdr.min_pktsize        = get_le32(pb);
180
            asf->hdr.max_pktsize        = get_le32(pb);
181
            asf->hdr.max_bitrate        = get_le32(pb);
182
            asf->packet_size = asf->hdr.max_pktsize;
183
            asf->nb_packets = asf->hdr.packets_count;
184
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
185
            int type, total_size, type_specific_size;
186
            unsigned int tag1;
187
            int64_t pos1, pos2;
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 * (int64_t)AV_TIME_BASE / 1000;
200
            st->duration = asf->hdr.send_time / 
201
                (10000000 / AV_TIME_BASE) - st->start_time;
202
            get_guid(pb, &g);
203
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
204
                type = CODEC_TYPE_AUDIO;
205
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
206
                type = CODEC_TYPE_VIDEO;
207
            } else {
208
                goto fail;
209
            }
210
            get_guid(pb, &g);
211
            total_size = get_le64(pb);
212
            type_specific_size = get_le32(pb);
213
            get_le32(pb);
214
            st->id = get_le16(pb) & 0x7f; /* stream id */
215
            // mapping of asf ID to AV stream ID;
216
            asf->asfid2avid[st->id] = s->nb_streams - 1;
217

    
218
            get_le32(pb);
219
            st->codec.codec_type = type;
220
            /* 1 fps default (XXX: put 0 fps instead) */
221
            st->codec.frame_rate = 1000; 
222
            st->codec.frame_rate_base = 1;
223
            if (type == CODEC_TYPE_AUDIO) {
224
                get_wav_header(pb, &st->codec, type_specific_size);
225
                st->need_parsing = 1;
226
                /* We have to init the frame size at some point .... */
227
                pos2 = url_ftell(pb);
228
                if (gsize > (pos2 + 8 - pos1 + 24)) {
229
                    asf_st->ds_span = get_byte(pb);
230
                    asf_st->ds_packet_size = get_le16(pb);
231
                    asf_st->ds_chunk_size = get_le16(pb);
232
                    asf_st->ds_data_size = get_le16(pb);
233
                    asf_st->ds_silence_data = get_byte(pb);
234
                }
235
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
236
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
237
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
238
                if (asf_st->ds_span > 1) {
239
                    if (!asf_st->ds_chunk_size
240
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
241
                        asf_st->ds_span = 0; // disable descrambling
242
                }
243
                switch (st->codec.codec_id) {
244
                case CODEC_ID_MP3:
245
                    st->codec.frame_size = MPA_FRAME_SIZE;
246
                    break;
247
                case CODEC_ID_PCM_S16LE:
248
                case CODEC_ID_PCM_S16BE:
249
                case CODEC_ID_PCM_U16LE:
250
                case CODEC_ID_PCM_U16BE:
251
                case CODEC_ID_PCM_S8:
252
                case CODEC_ID_PCM_U8:
253
                case CODEC_ID_PCM_ALAW:
254
                case CODEC_ID_PCM_MULAW:
255
                    st->codec.frame_size = 1;
256
                    break;
257
                default:
258
                    /* This is probably wrong, but it prevents a crash later */
259
                    st->codec.frame_size = 1;
260
                    break;
261
                }
262
            } else {
263
                get_le32(pb);
264
                get_le32(pb);
265
                get_byte(pb);
266
                size = get_le16(pb); /* size */
267
                get_le32(pb); /* size */
268
                st->codec.width = get_le32(pb);
269
                st->codec.height = get_le32(pb);
270
                /* not available for asf */
271
                get_le16(pb); /* panes */
272
                st->codec.bits_per_sample = get_le16(pb); /* depth */
273
                tag1 = get_le32(pb);
274
                url_fskip(pb, 20);
275
                if (size > 40) {
276
                    st->codec.extradata_size = size - 40;
277
                    st->codec.extradata = av_mallocz(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
278
                    get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
279
                }
280

    
281
        /* Extract palette from extradata if bpp <= 8 */
282
        /* This code assumes that extradata contains only palette */
283
        /* This is true for all paletted codecs implemented in ffmpeg */
284
        if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
285
            st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
286
#ifdef WORDS_BIGENDIAN
287
            for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
288
                st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
289
#else
290
            memcpy(st->codec.palctrl->palette, st->codec.extradata,
291
                   FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
292
#endif
293
            st->codec.palctrl->palette_changed = 1;
294
        }
295

    
296
                st->codec.codec_tag = tag1;
297
                st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
298
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
299
                    st->need_parsing = 1;
300
            }
301
            pos2 = url_ftell(pb);
302
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
303
        } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
304
            break;
305
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
306
            int len1, len2, len3, len4, len5;
307

    
308
            len1 = get_le16(pb);
309
            len2 = get_le16(pb);
310
            len3 = get_le16(pb);
311
            len4 = get_le16(pb);
312
            len5 = get_le16(pb);
313
            get_str16_nolen(pb, len1, s->title, sizeof(s->title));
314
            get_str16_nolen(pb, len2, s->author, sizeof(s->author));
315
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
316
            get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
317
            url_fskip(pb, len5);
318
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
319
                int desc_count, i;
320

    
321
                desc_count = get_le16(pb);
322
                for(i=0;i<desc_count;i++)
323
                {
324
                        int name_len,value_type,value_len,value_num = 0;
325
                        char *name, *value;
326

    
327
                        name_len = get_le16(pb);
328
                        name = (char *)av_mallocz(name_len);
329
                        get_str16_nolen(pb, name_len, name, name_len);
330
                        value_type = get_le16(pb);
331
                        value_len = get_le16(pb);
332
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
333
                        {
334
                                value = (char *)av_mallocz(value_len);
335
                                get_str16_nolen(pb, value_len, value, value_len);
336
                                if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
337
                                av_free(value);
338
                        }
339
                        if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD
340
                        {
341
                                if (value_type==2) value_num = get_le32(pb);
342
                                if (value_type==3) value_num = get_le32(pb);
343
                                if (value_type==4) value_num = get_le64(pb);
344
                                if (value_type==5) value_num = get_le16(pb);
345
                                if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
346
                                if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
347
                        }
348
                        av_free(name);
349
                }
350
#if 0
351
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
352
            int v1, v2;
353
            get_guid(pb, &g);
354
            v1 = get_le32(pb);
355
            v2 = get_le16(pb);
356
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
357
            int len, v1, n, num;
358
            char str[256], *q;
359
            char tag[16];
360

361
            get_guid(pb, &g);
362
            print_guid(&g);
363

364
            n = get_le32(pb);
365
            for(i=0;i<n;i++) {
366
                num = get_le16(pb); /* stream number */
367
                get_str16(pb, str, sizeof(str));
368
                get_str16(pb, str, sizeof(str));
369
                len = get_le16(pb);
370
                q = tag;
371
                while (len > 0) {
372
                    v1 = get_byte(pb);
373
                    if ((q - tag) < sizeof(tag) - 1)
374
                        *q++ = v1;
375
                    len--;
376
                }
377
                *q = '\0';
378
            }
379
#endif
380
        } else if (url_feof(pb)) {
381
            goto fail;
382
        } else {
383
            url_fseek(pb, gsize - 24, SEEK_CUR);
384
        }
385
    }
386
    get_guid(pb, &g);
387
    get_le64(pb);
388
    get_byte(pb);
389
    get_byte(pb);
390
    if (url_feof(pb))
391
        goto fail;
392
    asf->data_offset = url_ftell(pb);
393
    asf->packet_size_left = 0;
394

    
395
    return 0;
396

    
397
 fail:
398
     for(i=0;i<s->nb_streams;i++) {
399
        AVStream *st = s->streams[i];
400
        if (st) {
401
            av_free(st->priv_data);
402
            av_free(st->codec.extradata);
403
        }
404
        av_free(st);
405
    }
406
    return -1;
407
}
408

    
409
#define DO_2BITS(bits, var, defval) \
410
    switch (bits & 3) \
411
    { \
412
    case 3: var = get_le32(pb); rsize += 4; break; \
413
    case 2: var = get_le16(pb); rsize += 2; break; \
414
    case 1: var = get_byte(pb); rsize++; break; \
415
    default: var = defval; break; \
416
    }
417

    
418
static int asf_get_packet(AVFormatContext *s)
419
{
420
    ASFContext *asf = s->priv_data;
421
    ByteIOContext *pb = &s->pb;
422
    uint32_t packet_length, padsize;
423
    int rsize = 9;
424
    int c;
425
    
426
    if((url_ftell(&s->pb) - s->data_offset) % asf->packet_size)
427
        return -1;
428
    assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
429
    
430
    c = get_byte(pb);
431
    if (c != 0x82) {
432
        if (!url_feof(pb))
433
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
434
    }
435
    if ((c & 0x0f) == 2) { // always true for now
436
        if (get_le16(pb) != 0) {
437
            if (!url_feof(pb))
438
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
439
            return AVERROR_IO;
440
        }
441
        rsize+=2;
442
/*    }else{
443
        if (!url_feof(pb))
444
            printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
445
        return AVERROR_IO;*/
446
    }
447

    
448
    asf->packet_flags = get_byte(pb);
449
    asf->packet_property = get_byte(pb);
450

    
451
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
452
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
453
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
454

    
455
    asf->packet_timestamp = get_le32(pb);
456
    get_le16(pb); /* duration */
457
    // rsize has at least 11 bytes which have to be present
458

    
459
    if (asf->packet_flags & 0x01) {
460
        asf->packet_segsizetype = get_byte(pb); rsize++;
461
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
462
    } else {
463
        asf->packet_segments = 1;
464
        asf->packet_segsizetype = 0x80;
465
    }
466
    asf->packet_size_left = packet_length - padsize - rsize;
467
    if (packet_length < asf->hdr.min_pktsize)
468
        padsize += asf->hdr.min_pktsize - packet_length;
469
    asf->packet_padsize = padsize;
470
#ifdef DEBUG
471
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
472
#endif
473
    return 0;
474
}
475

    
476
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
477
{
478
    ASFContext *asf = s->priv_data;
479
    ASFStream *asf_st = 0;
480
    ByteIOContext *pb = &s->pb;
481
    //static int pc = 0;
482
    for (;;) {
483
        int rsize = 0;
484
        if (asf->packet_size_left < FRAME_HEADER_SIZE
485
            || asf->packet_segments < 1) {
486
            //asf->packet_size_left <= asf->packet_padsize) {
487
            int ret = asf->packet_size_left + asf->packet_padsize;
488
            //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
489
            /* fail safe */
490
            url_fskip(pb, ret);
491
            asf->packet_pos= url_ftell(&s->pb);
492
            ret = asf_get_packet(s);
493
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
494
            if (ret < 0 || url_feof(pb))
495
                return AVERROR_IO;
496
            asf->packet_time_start = 0;
497
            continue;
498
        }
499
        if (asf->packet_time_start == 0) {
500
            /* read frame header */
501
            int num = get_byte(pb);
502
            asf->packet_segments--;
503
            rsize++;
504
            asf->packet_key_frame = (num & 0x80) >> 7;
505
            asf->stream_index = asf->asfid2avid[num & 0x7f];
506
            // sequence should be ignored!
507
            DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
508
            DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
509
            DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
510
//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);
511
            if (asf->packet_replic_size > 1) {
512
                assert(asf->packet_replic_size >= 8);
513
                // it should be always at least 8 bytes - FIXME validate
514
                asf->packet_obj_size = get_le32(pb);
515
                asf->packet_frag_timestamp = get_le32(pb); // timestamp
516
                if (asf->packet_replic_size > 8)
517
                    url_fskip(pb, asf->packet_replic_size - 8);
518
                rsize += asf->packet_replic_size; // FIXME - check validity
519
            } else if (asf->packet_replic_size==1){
520
                // multipacket - frag_offset is begining timestamp
521
                asf->packet_time_start = asf->packet_frag_offset;
522
                asf->packet_frag_offset = 0;
523
                asf->packet_frag_timestamp = asf->packet_timestamp;
524

    
525
                asf->packet_time_delta = get_byte(pb);
526
                rsize++;
527
            }else{
528
                assert(asf->packet_replic_size==0);
529
            }
530
            if (asf->packet_flags & 0x01) {
531
                DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
532
#undef DO_2BITS
533
                //printf("Fragsize %d\n", asf->packet_frag_size);
534
            } else {
535
                asf->packet_frag_size = asf->packet_size_left - rsize;
536
                //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
537
            }
538
            if (asf->packet_replic_size == 1) {
539
                asf->packet_multi_size = asf->packet_frag_size;
540
                if (asf->packet_multi_size > asf->packet_size_left) {
541
                    asf->packet_segments = 0;
542
                    continue;
543
                }
544
            }
545
            asf->packet_size_left -= rsize;
546
            //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
547

    
548
            if (asf->stream_index < 0
549
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
550
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
551
                ) {
552
                asf->packet_time_start = 0;
553
                /* unhandled packet (should not happen) */
554
                url_fskip(pb, asf->packet_frag_size);
555
                asf->packet_size_left -= asf->packet_frag_size;
556
                if(asf->stream_index < 0)
557
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
558
                continue;
559
            }
560
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
561
        }
562
        asf_st = asf->asf_st;
563

    
564
        if ((asf->packet_frag_offset != asf_st->frag_offset
565
             || (asf->packet_frag_offset
566
                 && asf->packet_seq != asf_st->seq)) // seq should be ignored
567
           ) {
568
            /* cannot continue current packet: free it */
569
            // FIXME better check if packet was already allocated
570
            av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
571
                   asf_st->pkt.size,
572
                   asf->packet_obj_size,
573
                   asf->packet_frag_offset, asf_st->frag_offset,
574
                   asf->packet_seq, asf_st->seq, asf->packet_frag_size);
575
            if (asf_st->pkt.size)
576
                av_free_packet(&asf_st->pkt);
577
            asf_st->frag_offset = 0;
578
            if (asf->packet_frag_offset != 0) {
579
                url_fskip(pb, asf->packet_frag_size);
580
                av_log(s, AV_LOG_INFO, "ff asf parser skiping %db\n", asf->packet_frag_size);
581
                asf->packet_size_left -= asf->packet_frag_size;
582
                continue;
583
            }
584
        }
585
        if (asf->packet_replic_size == 1) {
586
            // frag_offset is here used as the begining timestamp
587
            asf->packet_frag_timestamp = asf->packet_time_start;
588
            asf->packet_time_start += asf->packet_time_delta;
589
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
590
            asf->packet_size_left--;
591
            asf->packet_multi_size--;
592
            if (asf->packet_multi_size < asf->packet_obj_size)
593
            {
594
                asf->packet_time_start = 0;
595
                url_fskip(pb, asf->packet_multi_size);
596
                asf->packet_size_left -= asf->packet_multi_size;
597
                continue;
598
            }
599
            asf->packet_multi_size -= asf->packet_obj_size;
600
            //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);
601
        }
602
        if (asf_st->frag_offset == 0) {
603
            /* new packet */
604
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
605
            asf_st->seq = asf->packet_seq;
606
            asf_st->pkt.pts = asf->packet_frag_timestamp;
607
            asf_st->pkt.stream_index = asf->stream_index;
608
            asf_st->packet_pos= asf->packet_pos;            
609
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n", 
610
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
611
//s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
612
            if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO) 
613
                asf->packet_key_frame = 1;
614
            if (asf->packet_key_frame)
615
                asf_st->pkt.flags |= PKT_FLAG_KEY;
616
        }
617

    
618
        /* read data */
619
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
620
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
621
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
622
        asf->packet_size_left -= asf->packet_frag_size;
623
        if (asf->packet_size_left < 0)
624
            continue;
625
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
626
                   asf->packet_frag_size);
627
        asf_st->frag_offset += asf->packet_frag_size;
628
        /* test if whole packet is read */
629
        if (asf_st->frag_offset == asf_st->pkt.size) {
630
            /* return packet */
631
            if (asf_st->ds_span > 1) {
632
                /* packet descrambling */
633
                char* newdata = av_malloc(asf_st->pkt.size);
634
                if (newdata) {
635
                    int offset = 0;
636
                    while (offset < asf_st->pkt.size) {
637
                        int off = offset / asf_st->ds_chunk_size;
638
                        int row = off / asf_st->ds_span;
639
                        int col = off % asf_st->ds_span;
640
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
641
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
642
                        memcpy(newdata + offset,
643
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
644
                               asf_st->ds_chunk_size);
645
                        offset += asf_st->ds_chunk_size;
646
                    }
647
                    av_free(asf_st->pkt.data);
648
                    asf_st->pkt.data = newdata;
649
                }
650
            }
651
            asf_st->frag_offset = 0;
652
            memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
653
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
654
            asf_st->pkt.size = 0;
655
            asf_st->pkt.data = 0;
656
            break; // packet completed
657
        }
658
    }
659
    return 0;
660
}
661

    
662
static int asf_read_close(AVFormatContext *s)
663
{
664
    int i;
665

    
666
    for(i=0;i<s->nb_streams;i++) {
667
        AVStream *st = s->streams[i];
668
        av_free(st->priv_data);
669
        av_free(st->codec.extradata);
670
    av_free(st->codec.palctrl);
671
    }
672
    return 0;
673
}
674

    
675
// Added to support seeking after packets have been read
676
// If information is not reset, read_packet fails due to
677
// leftover information from previous reads
678
static void asf_reset_header(AVFormatContext *s)
679
{
680
    ASFContext *asf = s->priv_data;
681
    ASFStream *asf_st;
682
    int i;
683

    
684
    asf->packet_nb_frames = 0;
685
    asf->packet_timestamp_start = -1;
686
    asf->packet_timestamp_end = -1;
687
    asf->packet_size_left = 0;
688
    asf->packet_segments = 0;
689
    asf->packet_flags = 0;
690
    asf->packet_property = 0;
691
    asf->packet_timestamp = 0;
692
    asf->packet_segsizetype = 0;
693
    asf->packet_segments = 0;
694
    asf->packet_seq = 0;
695
    asf->packet_replic_size = 0;
696
    asf->packet_key_frame = 0;
697
    asf->packet_padsize = 0;
698
    asf->packet_frag_offset = 0;
699
    asf->packet_frag_size = 0;
700
    asf->packet_frag_timestamp = 0;
701
    asf->packet_multi_size = 0;
702
    asf->packet_obj_size = 0;
703
    asf->packet_time_delta = 0;
704
    asf->packet_time_start = 0;
705
    
706
    for(i=0; i<s->nb_streams; i++){
707
        asf_st= s->streams[i]->priv_data;
708
        av_free_packet(&asf_st->pkt);
709
        asf_st->frag_offset=0;
710
        asf_st->seq=0;
711
    }
712
    asf->asf_st= NULL;
713
}
714

    
715
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
716
{
717
    ASFContext *asf = s->priv_data;
718
    AVPacket pkt1, *pkt = &pkt1;
719
    ASFStream *asf_st;
720
    int64_t pts;
721
    int64_t pos= *ppos;
722
    int i;
723
    int64_t start_pos[s->nb_streams];
724
    
725
    for(i=0; i<s->nb_streams; i++){
726
        start_pos[i]= pos;
727
    }
728
    
729
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
730
    *ppos= pos;
731
    url_fseek(&s->pb, pos, SEEK_SET);
732
    
733
//printf("asf_read_pts\n");
734
    asf_reset_header(s);
735
    for(;;){
736
        if (av_read_frame(s, pkt) < 0){
737
            av_log(s, AV_LOG_INFO, "seek failed\n");
738
                return AV_NOPTS_VALUE;
739
        }
740
        
741
        pts= pkt->pts * 1000 / AV_TIME_BASE;
742

    
743
        av_free_packet(pkt);
744
        if(pkt->flags&PKT_FLAG_KEY){
745
            i= pkt->stream_index;
746

    
747
            asf_st= s->streams[i]->priv_data;
748

    
749
            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
750
            pos= asf_st->packet_pos;
751

    
752
            av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
753
            start_pos[i]= asf_st->packet_pos + 1;
754
            
755
            if(pkt->stream_index == stream_index)
756
               break;
757
        }
758
    }
759

    
760
    *ppos= pos;
761
//printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
762

    
763
    return pts;
764
}
765

    
766
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
767
{
768
    ASFContext *asf = s->priv_data;
769
    
770
    if (asf->packet_size <= 0)
771
        return -1;
772

    
773
    if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
774
        return -1;
775

    
776
    asf_reset_header(s);
777
    return 0;
778
}
779

    
780
static AVInputFormat asf_iformat = {
781
    "asf",
782
    "asf format",
783
    sizeof(ASFContext),
784
    asf_probe,
785
    asf_read_header,
786
    asf_read_packet,
787
    asf_read_close,
788
    asf_read_seek,
789
    asf_read_pts,
790
};
791

    
792
#ifdef CONFIG_ENCODERS
793
    extern AVOutputFormat asf_oformat;
794
    extern AVOutputFormat asf_stream_oformat;
795
#endif //CONFIG_ENCODERS
796

    
797
int asf_init(void)
798
{
799
    av_register_input_format(&asf_iformat);
800
#ifdef CONFIG_ENCODERS
801
    av_register_output_format(&asf_oformat);
802
    av_register_output_format(&asf_stream_oformat);
803
#endif //CONFIG_ENCODERS
804
    return 0;
805
}