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ffmpeg / libavformat / asf.c @ 0ab1ebea

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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 (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
123
        return AVPROBE_SCORE_MAX;
124
    else
125
        return 0;
126
}
127

    
128
static int get_value(ByteIOContext *pb, int type){
129
    switch(type){
130
        case 2: return get_le32(pb);
131
        case 3: return get_le32(pb);
132
        case 4: return get_le64(pb);
133
        case 5: return get_le16(pb);
134
        default:return INT_MIN;
135
    }
136
}
137

    
138
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
139
{
140
    ASFContext *asf = s->priv_data;
141
    GUID g;
142
    ByteIOContext *pb = &s->pb;
143
    AVStream *st;
144
    ASFStream *asf_st;
145
    int size, i;
146
    int64_t gsize;
147
    AVRational dar[128];
148
    uint32_t bitrate[128];
149

    
150
    memset(dar, 0, sizeof(dar));
151
    memset(bitrate, 0, sizeof(bitrate));
152

    
153
    get_guid(pb, &g);
154
    if (memcmp(&g, &asf_header, sizeof(GUID)))
155
        goto fail;
156
    get_le64(pb);
157
    get_le32(pb);
158
    get_byte(pb);
159
    get_byte(pb);
160
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
161
    for(;;) {
162
        get_guid(pb, &g);
163
        gsize = get_le64(pb);
164
#ifdef DEBUG
165
        printf("%08"PRIx64": ", url_ftell(pb) - 24);
166
        print_guid(&g);
167
        printf("  size=0x%"PRIx64"\n", gsize);
168
#endif
169
        if (!memcmp(&g, &data_header, sizeof(GUID))) {
170
            asf->data_object_offset = url_ftell(pb);
171
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
172
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
173
                asf->data_object_size = gsize - 24;
174
            } else {
175
                asf->data_object_size = (uint64_t)-1;
176
            }
177
            break;
178
        }
179
        if (gsize < 24)
180
            goto fail;
181
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
182
            get_guid(pb, &asf->hdr.guid);
183
            asf->hdr.file_size          = get_le64(pb);
184
            asf->hdr.create_time        = get_le64(pb);
185
            asf->nb_packets             = get_le64(pb);
186
            asf->hdr.send_time          = get_le64(pb);
187
            asf->hdr.play_time          = get_le64(pb);
188
            asf->hdr.preroll            = get_le32(pb);
189
            asf->hdr.ignore             = get_le32(pb);
190
            asf->hdr.flags              = get_le32(pb);
191
            asf->hdr.min_pktsize        = get_le32(pb);
192
            asf->hdr.max_pktsize        = get_le32(pb);
193
            asf->hdr.max_bitrate        = get_le32(pb);
194
            asf->packet_size = asf->hdr.max_pktsize;
195
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
196
            int type, type_specific_size, sizeX;
197
            uint64_t total_size;
198
            unsigned int tag1;
199
            int64_t pos1, pos2, start_time;
200
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
201

    
202
            pos1 = url_ftell(pb);
203

    
204
            st = av_new_stream(s, 0);
205
            if (!st)
206
                goto fail;
207
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
208
            asf_st = av_mallocz(sizeof(ASFStream));
209
            if (!asf_st)
210
                goto fail;
211
            st->priv_data = asf_st;
212
            start_time = asf->hdr.preroll;
213

    
214
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
215
                st->duration = asf->hdr.send_time /
216
                    (10000000 / 1000) - 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
                    is_dvr_ms_audio=1;
248
                    get_guid(pb, &g);
249
                    get_le32(pb);
250
                    get_le32(pb);
251
                    get_le32(pb);
252
                    get_guid(pb, &g);
253
                    get_le32(pb);
254
                }
255
            }
256

    
257
            st->codec->codec_type = type;
258
            if (type == CODEC_TYPE_AUDIO) {
259
                get_wav_header(pb, st->codec, type_specific_size);
260
                if (is_dvr_ms_audio) {
261
                    // codec_id and codec_tag are unreliable in dvr_ms
262
                    // files. Set them later by probing stream.
263
                    st->codec->codec_id = CODEC_ID_NONE;
264
                    st->codec->codec_tag = 0;
265
                }
266
                st->need_parsing = AVSTREAM_PARSE_FULL;
267
                /* We have to init the frame size at some point .... */
268
                pos2 = url_ftell(pb);
269
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
270
                    asf_st->ds_span = get_byte(pb);
271
                    asf_st->ds_packet_size = get_le16(pb);
272
                    asf_st->ds_chunk_size = get_le16(pb);
273
                    get_le16(pb); //ds_data_size
274
                    get_byte(pb); //ds_silence_data
275
                }
276
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
277
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
278
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
279
                if (asf_st->ds_span > 1) {
280
                    if (!asf_st->ds_chunk_size
281
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
282
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
283
                        asf_st->ds_span = 0; // disable descrambling
284
                }
285
                switch (st->codec->codec_id) {
286
                case CODEC_ID_MP3:
287
                    st->codec->frame_size = MPA_FRAME_SIZE;
288
                    break;
289
                case CODEC_ID_PCM_S16LE:
290
                case CODEC_ID_PCM_S16BE:
291
                case CODEC_ID_PCM_U16LE:
292
                case CODEC_ID_PCM_U16BE:
293
                case CODEC_ID_PCM_S8:
294
                case CODEC_ID_PCM_U8:
295
                case CODEC_ID_PCM_ALAW:
296
                case CODEC_ID_PCM_MULAW:
297
                    st->codec->frame_size = 1;
298
                    break;
299
                default:
300
                    /* This is probably wrong, but it prevents a crash later */
301
                    st->codec->frame_size = 1;
302
                    break;
303
                }
304
            } else if (type == CODEC_TYPE_VIDEO) {
305
                get_le32(pb);
306
                get_le32(pb);
307
                get_byte(pb);
308
                size = get_le16(pb); /* size */
309
                sizeX= get_le32(pb); /* size */
310
                st->codec->width = get_le32(pb);
311
                st->codec->height = get_le32(pb);
312
                /* not available for asf */
313
                get_le16(pb); /* panes */
314
                st->codec->bits_per_sample = get_le16(pb); /* depth */
315
                tag1 = get_le32(pb);
316
                url_fskip(pb, 20);
317
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
318
                size= sizeX;
319
                if (size > 40) {
320
                    st->codec->extradata_size = size - 40;
321
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
322
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
323
                }
324

    
325
        /* Extract palette from extradata if bpp <= 8 */
326
        /* This code assumes that extradata contains only palette */
327
        /* This is true for all paletted codecs implemented in ffmpeg */
328
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
329
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
330
#ifdef WORDS_BIGENDIAN
331
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
332
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
333
#else
334
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
335
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
336
#endif
337
            st->codec->palctrl->palette_changed = 1;
338
        }
339

    
340
                st->codec->codec_tag = tag1;
341
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
342
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
343
                    st->need_parsing = AVSTREAM_PARSE_FULL;
344
            }
345
            pos2 = url_ftell(pb);
346
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
347
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
348
            int len1, len2, len3, len4, len5;
349

    
350
            len1 = get_le16(pb);
351
            len2 = get_le16(pb);
352
            len3 = get_le16(pb);
353
            len4 = get_le16(pb);
354
            len5 = get_le16(pb);
355
            get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
356
            get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
357
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
358
            get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
359
            url_fskip(pb, len5);
360
        } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
361
            int stream_count = get_le16(pb);
362
            int j;
363

    
364
//            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
365
//            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
366
            for(j = 0; j < stream_count; j++) {
367
                int flags, bitrate, stream_id;
368

    
369
                flags= get_le16(pb);
370
                bitrate= get_le32(pb);
371
                stream_id= (flags & 0x7f);
372
//                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
373
                asf->stream_bitrates[stream_id]= bitrate;
374
            }
375
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
376
                int desc_count, i;
377

    
378
                desc_count = get_le16(pb);
379
                for(i=0;i<desc_count;i++)
380
                {
381
                        int name_len,value_type,value_len;
382
                        uint64_t value_num = 0;
383
                        char name[1024];
384

    
385
                        name_len = get_le16(pb);
386
                        get_str16_nolen(pb, name_len, name, sizeof(name));
387
                        value_type = get_le16(pb);
388
                        value_len = get_le16(pb);
389
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
390
                        {
391
                                if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
392
                                else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
393
                                else if(!strcmp(name,"WM/Track") && s->track == 0) {
394
                                    char track[8];
395
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
396
                                    s->track = strtol(track, NULL, 10) + 1;
397
                                }
398
                                else if(!strcmp(name,"WM/TrackNumber")) {
399
                                    char track[8];
400
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
401
                                    s->track = strtol(track, NULL, 10);
402
                                }
403
                                else url_fskip(pb, value_len);
404
                        }
405
                        if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
406
                        {
407
                                value_num= get_value(pb, value_type);
408
                                if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
409
                                if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
410
                        }
411
                }
412
        } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
413
            int n, stream_num, name_len, value_len, value_type, value_num;
414
            n = get_le16(pb);
415

    
416
            for(i=0;i<n;i++) {
417
                char name[1024];
418

    
419
                get_le16(pb); //lang_list_index
420
                stream_num= get_le16(pb);
421
                name_len=   get_le16(pb);
422
                value_type= get_le16(pb);
423
                value_len=  get_le32(pb);
424

    
425
                get_str16_nolen(pb, name_len, name, sizeof(name));
426
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
427
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
428
                url_fskip(pb, value_len - 2);
429

    
430
                if(stream_num<128){
431
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
432
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
433
                }
434
            }
435
        } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
436
            int ext_len, payload_ext_ct, stream_ct;
437
            uint32_t ext_d, leak_rate, stream_num;
438
            int64_t pos_ex_st;
439
            pos_ex_st = url_ftell(pb);
440

    
441
            get_le64(pb); // starttime
442
            get_le64(pb); // endtime
443
            leak_rate = get_le32(pb); // leak-datarate
444
            get_le32(pb); // bucket-datasize
445
            get_le32(pb); // init-bucket-fullness
446
            get_le32(pb); // alt-leak-datarate
447
            get_le32(pb); // alt-bucket-datasize
448
            get_le32(pb); // alt-init-bucket-fullness
449
            get_le32(pb); // max-object-size
450
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
451
            stream_num = get_le16(pb); // stream-num
452
            get_le16(pb); // stream-language-id-index
453
            get_le64(pb); // avg frametime in 100ns units
454
            stream_ct = get_le16(pb); //stream-name-count
455
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
456

    
457
            if (stream_num < 128)
458
                bitrate[stream_num] = leak_rate;
459

    
460
            for (i=0; i<stream_ct; i++){
461
                get_le16(pb);
462
                ext_len = get_le16(pb);
463
                url_fseek(pb, ext_len, SEEK_CUR);
464
            }
465

    
466
            for (i=0; i<payload_ext_ct; i++){
467
                get_guid(pb, &g);
468
                ext_d=get_le16(pb);
469
                ext_len=get_le32(pb);
470
                url_fseek(pb, ext_len, SEEK_CUR);
471
            }
472

    
473
            // there could be a optional stream properties object to follow
474
            // if so the next iteration will pick it up
475
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
476
            int v1, v2;
477
            get_guid(pb, &g);
478
            v1 = get_le32(pb);
479
            v2 = get_le16(pb);
480
#if 0
481
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
482
            int len, v1, n, num;
483
            char str[256], *q;
484
            char tag[16];
485

486
            get_guid(pb, &g);
487
            print_guid(&g);
488

489
            n = get_le32(pb);
490
            for(i=0;i<n;i++) {
491
                num = get_le16(pb); /* stream number */
492
                get_str16(pb, str, sizeof(str));
493
                get_str16(pb, str, sizeof(str));
494
                len = get_le16(pb);
495
                q = tag;
496
                while (len > 0) {
497
                    v1 = get_byte(pb);
498
                    if ((q - tag) < sizeof(tag) - 1)
499
                        *q++ = v1;
500
                    len--;
501
                }
502
                *q = '\0';
503
            }
504
#endif
505
        } else if (url_feof(pb)) {
506
            goto fail;
507
        } else {
508
            url_fseek(pb, gsize - 24, SEEK_CUR);
509
        }
510
    }
511
    get_guid(pb, &g);
512
    get_le64(pb);
513
    get_byte(pb);
514
    get_byte(pb);
515
    if (url_feof(pb))
516
        goto fail;
517
    asf->data_offset = url_ftell(pb);
518
    asf->packet_size_left = 0;
519

    
520

    
521
    for(i=0; i<128; i++){
522
        int stream_num= asf->asfid2avid[i];
523
        if(stream_num>=0){
524
            AVCodecContext *codec= s->streams[stream_num]->codec;
525
            if (!codec->bit_rate)
526
                codec->bit_rate = bitrate[i];
527
            if (dar[i].num > 0 && dar[i].den > 0)
528
                av_reduce(&codec->sample_aspect_ratio.num,
529
                          &codec->sample_aspect_ratio.den,
530
                          dar[i].num, dar[i].den, INT_MAX);
531
//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);
532
        }
533
    }
534

    
535
    return 0;
536

    
537
 fail:
538
     for(i=0;i<s->nb_streams;i++) {
539
        AVStream *st = s->streams[i];
540
        if (st) {
541
            av_free(st->priv_data);
542
            av_free(st->codec->extradata);
543
        }
544
        av_free(st);
545
    }
546
    return -1;
547
}
548

    
549
#define DO_2BITS(bits, var, defval) \
550
    switch (bits & 3) \
551
    { \
552
    case 3: var = get_le32(pb); rsize += 4; break; \
553
    case 2: var = get_le16(pb); rsize += 2; break; \
554
    case 1: var = get_byte(pb); rsize++; break; \
555
    default: var = defval; break; \
556
    }
557

    
558
/**
559
 *
560
 * @return <0 in case of an error
561
 */
562
static int asf_get_packet(AVFormatContext *s)
563
{
564
    ASFContext *asf = s->priv_data;
565
    ByteIOContext *pb = &s->pb;
566
    uint32_t packet_length, padsize;
567
    int rsize = 8;
568
    int c, d, e, off;
569

    
570
    off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
571

    
572
    c=d=e=-1;
573
    while(off-- > 0){
574
        c=d; d=e;
575
        e= get_byte(pb);
576
        if(c == 0x82 && !d && !e)
577
            break;
578
    }
579

    
580
    if (c != 0x82) {
581
        if (!url_feof(pb))
582
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
583
    }
584
    if ((c & 0x8f) == 0x82) {
585
        if (d || e) {
586
            if (!url_feof(pb))
587
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
588
            return -1;
589
        }
590
        c= get_byte(pb);
591
        d= get_byte(pb);
592
        rsize+=3;
593
    }else{
594
        url_fseek(pb, -1, SEEK_CUR); //FIXME
595
    }
596

    
597
    asf->packet_flags    = c;
598
    asf->packet_property = d;
599

    
600
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
601
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
602
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
603

    
604
    //the following checks prevent overflows and infinite loops
605
    if(packet_length >= (1U<<29)){
606
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
607
        return -1;
608
    }
609
    if(padsize >= packet_length){
610
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
611
        return -1;
612
    }
613

    
614
    asf->packet_timestamp = get_le32(pb);
615
    get_le16(pb); /* duration */
616
    // rsize has at least 11 bytes which have to be present
617

    
618
    if (asf->packet_flags & 0x01) {
619
        asf->packet_segsizetype = get_byte(pb); rsize++;
620
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
621
    } else {
622
        asf->packet_segments = 1;
623
        asf->packet_segsizetype = 0x80;
624
    }
625
    asf->packet_size_left = packet_length - padsize - rsize;
626
    if (packet_length < asf->hdr.min_pktsize)
627
        padsize += asf->hdr.min_pktsize - packet_length;
628
    asf->packet_padsize = padsize;
629
#ifdef DEBUG
630
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
631
#endif
632
    return 0;
633
}
634

    
635
/**
636
 *
637
 * @return <0 if error
638
 */
639
static int asf_read_frame_header(AVFormatContext *s){
640
    ASFContext *asf = s->priv_data;
641
    ByteIOContext *pb = &s->pb;
642
    int rsize = 1;
643
    int num = get_byte(pb);
644
    int64_t ts0, ts1;
645

    
646
    asf->packet_segments--;
647
    asf->packet_key_frame = num >> 7;
648
    asf->stream_index = asf->asfid2avid[num & 0x7f];
649
    // sequence should be ignored!
650
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
651
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
652
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
653
//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);
654
    if (asf->packet_replic_size >= 8) {
655
        asf->packet_obj_size = get_le32(pb);
656
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
657
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
658
            return -1;
659
        }
660
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
661
        if(asf->packet_replic_size >= 8+38+4){
662
//            for(i=0; i<asf->packet_replic_size-8; i++)
663
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
664
//            av_log(s, AV_LOG_DEBUG, "\n");
665
            url_fskip(pb, 10);
666
            ts0= get_le64(pb);
667
            ts1= get_le64(pb);
668
            url_fskip(pb, 12);
669
            get_le32(pb);
670
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
671
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
672
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
673
        }else
674
            url_fskip(pb, asf->packet_replic_size - 8);
675
        rsize += asf->packet_replic_size; // FIXME - check validity
676
    } else if (asf->packet_replic_size==1){
677
        // multipacket - frag_offset is begining timestamp
678
        asf->packet_time_start = asf->packet_frag_offset;
679
        asf->packet_frag_offset = 0;
680
        asf->packet_frag_timestamp = asf->packet_timestamp;
681

    
682
        asf->packet_time_delta = get_byte(pb);
683
        rsize++;
684
    }else if(asf->packet_replic_size!=0){
685
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
686
        return -1;
687
    }
688
    if (asf->packet_flags & 0x01) {
689
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
690
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
691
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
692
            return -1;
693
        }
694
        //printf("Fragsize %d\n", asf->packet_frag_size);
695
    } else {
696
        asf->packet_frag_size = asf->packet_size_left - rsize;
697
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
698
    }
699
    if (asf->packet_replic_size == 1) {
700
        asf->packet_multi_size = asf->packet_frag_size;
701
        if (asf->packet_multi_size > asf->packet_size_left)
702
            return -1;
703
    }
704
    asf->packet_size_left -= rsize;
705
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
706

    
707
    return 0;
708
}
709

    
710
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
711
{
712
    ASFContext *asf = s->priv_data;
713
    ASFStream *asf_st = 0;
714
    ByteIOContext *pb = &s->pb;
715
    //static int pc = 0;
716
    for (;;) {
717
        if(url_feof(pb))
718
            return AVERROR(EIO);
719
        if (asf->packet_size_left < FRAME_HEADER_SIZE
720
            || asf->packet_segments < 1) {
721
            //asf->packet_size_left <= asf->packet_padsize) {
722
            int ret = asf->packet_size_left + asf->packet_padsize;
723
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
724
            assert(ret>=0);
725
            /* fail safe */
726
            url_fskip(pb, ret);
727

    
728
            asf->packet_pos= url_ftell(&s->pb);
729
            if (asf->data_object_size != (uint64_t)-1 &&
730
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
731
                return AVERROR(EIO); /* Do not exceed the size of the data object */
732
            ret = asf_get_packet(s);
733
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
734
            if (ret < 0)
735
                assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
736
            asf->packet_time_start = 0;
737
            continue;
738
        }
739
        if (asf->packet_time_start == 0) {
740
            if(asf_read_frame_header(s) < 0){
741
                asf->packet_segments= 0;
742
                continue;
743
            }
744
            if (asf->stream_index < 0
745
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
746
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
747
                ) {
748
                asf->packet_time_start = 0;
749
                /* unhandled packet (should not happen) */
750
                url_fskip(pb, asf->packet_frag_size);
751
                asf->packet_size_left -= asf->packet_frag_size;
752
                if(asf->stream_index < 0)
753
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
754
                continue;
755
            }
756
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
757
        }
758
        asf_st = asf->asf_st;
759

    
760
        if (asf->packet_replic_size == 1) {
761
            // frag_offset is here used as the begining timestamp
762
            asf->packet_frag_timestamp = asf->packet_time_start;
763
            asf->packet_time_start += asf->packet_time_delta;
764
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
765
            asf->packet_size_left--;
766
            asf->packet_multi_size--;
767
            if (asf->packet_multi_size < asf->packet_obj_size)
768
            {
769
                asf->packet_time_start = 0;
770
                url_fskip(pb, asf->packet_multi_size);
771
                asf->packet_size_left -= asf->packet_multi_size;
772
                continue;
773
            }
774
            asf->packet_multi_size -= asf->packet_obj_size;
775
            //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);
776
        }
777
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
778
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
779
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
780
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
781
                asf_st->frag_offset, asf->packet_frag_size,
782
                asf->packet_obj_size, asf_st->pkt.size);
783
            asf->packet_obj_size= asf_st->pkt.size;
784
        }
785

    
786
        if (   asf_st->pkt.size != asf->packet_obj_size
787
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
788
            if(asf_st->pkt.data){
789
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
790
                asf_st->frag_offset = 0;
791
                av_free_packet(&asf_st->pkt);
792
            }
793
            /* new packet */
794
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
795
            asf_st->seq = asf->packet_seq;
796
            asf_st->pkt.pts = asf->packet_frag_timestamp;
797
            asf_st->pkt.stream_index = asf->stream_index;
798
            asf_st->pkt.pos =
799
            asf_st->packet_pos= asf->packet_pos;
800
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
801
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
802
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
803
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
804
                asf->packet_key_frame = 1;
805
            if (asf->packet_key_frame)
806
                asf_st->pkt.flags |= PKT_FLAG_KEY;
807
        }
808

    
809
        /* read data */
810
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
811
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
812
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
813
        asf->packet_size_left -= asf->packet_frag_size;
814
        if (asf->packet_size_left < 0)
815
            continue;
816

    
817
        if(   asf->packet_frag_offset >= asf_st->pkt.size
818
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
819
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
820
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
821
            continue;
822
        }
823

    
824
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
825
                   asf->packet_frag_size);
826
        asf_st->frag_offset += asf->packet_frag_size;
827
        /* test if whole packet is read */
828
        if (asf_st->frag_offset == asf_st->pkt.size) {
829
            //workaround for macroshit radio DVR-MS files
830
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
831
               && asf_st->pkt.size > 100){
832
                int i;
833
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
834
                if(i == asf_st->pkt.size){
835
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
836
                    asf_st->frag_offset = 0;
837
                    av_free_packet(&asf_st->pkt);
838
                    continue;
839
                }
840
            }
841

    
842
            /* return packet */
843
            if (asf_st->ds_span > 1) {
844
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
845
                    av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
846
              }else{
847
                /* packet descrambling */
848
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
849
                if (newdata) {
850
                    int offset = 0;
851
                    while (offset < asf_st->pkt.size) {
852
                        int off = offset / asf_st->ds_chunk_size;
853
                        int row = off / asf_st->ds_span;
854
                        int col = off % asf_st->ds_span;
855
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
856
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
857

    
858
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
859
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
860
                        memcpy(newdata + offset,
861
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
862
                               asf_st->ds_chunk_size);
863
                        offset += asf_st->ds_chunk_size;
864
                    }
865
                    av_free(asf_st->pkt.data);
866
                    asf_st->pkt.data = newdata;
867
                }
868
              }
869
            }
870
            asf_st->frag_offset = 0;
871
            *pkt= asf_st->pkt;
872
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
873
            asf_st->pkt.size = 0;
874
            asf_st->pkt.data = 0;
875
            break; // packet completed
876
        }
877
    }
878
    return 0;
879
}
880

    
881
static int asf_read_close(AVFormatContext *s)
882
{
883
    int i;
884

    
885
    for(i=0;i<s->nb_streams;i++) {
886
        AVStream *st = s->streams[i];
887
        av_free(st->priv_data);
888
        av_free(st->codec->palctrl);
889
    }
890
    return 0;
891
}
892

    
893
// Added to support seeking after packets have been read
894
// If information is not reset, read_packet fails due to
895
// leftover information from previous reads
896
static void asf_reset_header(AVFormatContext *s)
897
{
898
    ASFContext *asf = s->priv_data;
899
    ASFStream *asf_st;
900
    int i;
901

    
902
    asf->packet_nb_frames = 0;
903
    asf->packet_size_left = 0;
904
    asf->packet_segments = 0;
905
    asf->packet_flags = 0;
906
    asf->packet_property = 0;
907
    asf->packet_timestamp = 0;
908
    asf->packet_segsizetype = 0;
909
    asf->packet_segments = 0;
910
    asf->packet_seq = 0;
911
    asf->packet_replic_size = 0;
912
    asf->packet_key_frame = 0;
913
    asf->packet_padsize = 0;
914
    asf->packet_frag_offset = 0;
915
    asf->packet_frag_size = 0;
916
    asf->packet_frag_timestamp = 0;
917
    asf->packet_multi_size = 0;
918
    asf->packet_obj_size = 0;
919
    asf->packet_time_delta = 0;
920
    asf->packet_time_start = 0;
921

    
922
    for(i=0; i<s->nb_streams; i++){
923
        asf_st= s->streams[i]->priv_data;
924
        av_free_packet(&asf_st->pkt);
925
        asf_st->frag_offset=0;
926
        asf_st->seq=0;
927
    }
928
    asf->asf_st= NULL;
929
}
930

    
931
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
932
{
933
    ASFContext *asf = s->priv_data;
934
    AVPacket pkt1, *pkt = &pkt1;
935
    ASFStream *asf_st;
936
    int64_t pts;
937
    int64_t pos= *ppos;
938
    int i;
939
    int64_t start_pos[s->nb_streams];
940

    
941
    for(i=0; i<s->nb_streams; i++){
942
        start_pos[i]= pos;
943
    }
944

    
945
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
946
    *ppos= pos;
947
    url_fseek(&s->pb, pos, SEEK_SET);
948

    
949
//printf("asf_read_pts\n");
950
    asf_reset_header(s);
951
    for(;;){
952
        if (av_read_frame(s, pkt) < 0){
953
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
954
            return AV_NOPTS_VALUE;
955
        }
956

    
957
        pts= pkt->pts;
958

    
959
        av_free_packet(pkt);
960
        if(pkt->flags&PKT_FLAG_KEY){
961
            i= pkt->stream_index;
962

    
963
            asf_st= s->streams[i]->priv_data;
964

    
965
//            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
966
            pos= asf_st->packet_pos;
967

    
968
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
969
            start_pos[i]= asf_st->packet_pos + 1;
970

    
971
            if(pkt->stream_index == stream_index)
972
               break;
973
        }
974
    }
975

    
976
    *ppos= pos;
977
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
978

    
979
    return pts;
980
}
981

    
982
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
983
{
984
    GUID g;
985
    ASFContext *asf = s->priv_data;
986
    int64_t gsize, itime;
987
    int64_t pos, current_pos, index_pts;
988
    int i;
989
    int pct,ict;
990

    
991
    current_pos = url_ftell(&s->pb);
992

    
993
    url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
994
    get_guid(&s->pb, &g);
995
    if (!memcmp(&g, &index_guid, sizeof(GUID))) {
996
        gsize = get_le64(&s->pb);
997
        get_guid(&s->pb, &g);
998
        itime=get_le64(&s->pb);
999
        pct=get_le32(&s->pb);
1000
        ict=get_le32(&s->pb);
1001
        av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1002

    
1003
        for (i=0;i<ict;i++){
1004
            int pktnum=get_le32(&s->pb);
1005
            int pktct =get_le16(&s->pb);
1006
            av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1007

    
1008
            pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1009
            index_pts=av_rescale(itime, i, 10000);
1010

    
1011
            av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1012
        }
1013
        asf->index_read= 1;
1014
    }
1015
    url_fseek(&s->pb, current_pos, SEEK_SET);
1016
}
1017

    
1018
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1019
{
1020
    ASFContext *asf = s->priv_data;
1021
    AVStream *st = s->streams[stream_index];
1022
    int64_t pos;
1023
    int index;
1024

    
1025
    if (asf->packet_size <= 0)
1026
        return -1;
1027

    
1028
    if (!asf->index_read)
1029
        asf_build_simple_index(s, stream_index);
1030

    
1031
    if(!(asf->index_read && st->index_entries)){
1032
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1033
            return -1;
1034
    }else{
1035
        index= av_index_search_timestamp(st, pts, flags);
1036
        if(index<0)
1037
            return -1;
1038

    
1039
        /* find the position */
1040
        pos = st->index_entries[index].pos;
1041
        pts = st->index_entries[index].timestamp;
1042

    
1043
    // various attempts to find key frame have failed so far
1044
    //    asf_reset_header(s);
1045
    //    url_fseek(&s->pb, pos, SEEK_SET);
1046
    //    key_pos = pos;
1047
    //     for(i=0;i<16;i++){
1048
    //         pos = url_ftell(&s->pb);
1049
    //         if (av_read_frame(s, &pkt) < 0){
1050
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1051
    //             return -1;
1052
    //         }
1053
    //         asf_st = s->streams[stream_index]->priv_data;
1054
    //         pos += st->parser->frame_offset;
1055
    //
1056
    //         if (pkt.size > b) {
1057
    //             b = pkt.size;
1058
    //             key_pos = pos;
1059
    //         }
1060
    //
1061
    //         av_free_packet(&pkt);
1062
    //     }
1063

    
1064
        /* do the seek */
1065
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1066
        url_fseek(&s->pb, pos, SEEK_SET);
1067
    }
1068
    asf_reset_header(s);
1069
    return 0;
1070
}
1071

    
1072
AVInputFormat asf_demuxer = {
1073
    "asf",
1074
    "asf format",
1075
    sizeof(ASFContext),
1076
    asf_probe,
1077
    asf_read_header,
1078
    asf_read_packet,
1079
    asf_read_close,
1080
    asf_read_seek,
1081
    asf_read_pts,
1082
};