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ffmpeg / libavformat / asf.c @ 60ff1c44

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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;
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
            st->start_time = asf->hdr.preroll;
213
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
214
                st->duration = asf->hdr.send_time /
215
                    (10000000 / 1000) - st->start_time;
216
            }
217
            get_guid(pb, &g);
218

    
219
            test_for_ext_stream_audio = 0;
220
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
221
                type = CODEC_TYPE_AUDIO;
222
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
223
                type = CODEC_TYPE_VIDEO;
224
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
225
                type = CODEC_TYPE_UNKNOWN;
226
            } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
227
                test_for_ext_stream_audio = 1;
228
                type = CODEC_TYPE_UNKNOWN;
229
            } else {
230
                goto fail;
231
            }
232
            get_guid(pb, &g);
233
            total_size = get_le64(pb);
234
            type_specific_size = get_le32(pb);
235
            get_le32(pb);
236
            st->id = get_le16(pb) & 0x7f; /* stream id */
237
            // mapping of asf ID to AV stream ID;
238
            asf->asfid2avid[st->id] = s->nb_streams - 1;
239

    
240
            get_le32(pb);
241

    
242
            if (test_for_ext_stream_audio) {
243
                get_guid(pb, &g);
244
                if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
245
                    type = CODEC_TYPE_AUDIO;
246
                    is_dvr_ms_audio=1;
247
                    get_guid(pb, &g);
248
                    get_le32(pb);
249
                    get_le32(pb);
250
                    get_le32(pb);
251
                    get_guid(pb, &g);
252
                    get_le32(pb);
253
                }
254
            }
255

    
256
            st->codec->codec_type = type;
257
            if (type == CODEC_TYPE_AUDIO) {
258
                get_wav_header(pb, st->codec, type_specific_size);
259
                if (is_dvr_ms_audio) {
260
                    // codec_id and codec_tag are unreliable in dvr_ms
261
                    // files. Set them later by probing stream.
262
                    st->codec->codec_id = CODEC_ID_NONE;
263
                    st->codec->codec_tag = 0;
264
                }
265
                st->need_parsing = AVSTREAM_PARSE_FULL;
266
                /* We have to init the frame size at some point .... */
267
                pos2 = url_ftell(pb);
268
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
269
                    asf_st->ds_span = get_byte(pb);
270
                    asf_st->ds_packet_size = get_le16(pb);
271
                    asf_st->ds_chunk_size = get_le16(pb);
272
                    get_le16(pb); //ds_data_size
273
                    get_byte(pb); //ds_silence_data
274
                }
275
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
276
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
277
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
278
                if (asf_st->ds_span > 1) {
279
                    if (!asf_st->ds_chunk_size
280
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
281
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
282
                        asf_st->ds_span = 0; // disable descrambling
283
                }
284
                switch (st->codec->codec_id) {
285
                case CODEC_ID_MP3:
286
                    st->codec->frame_size = MPA_FRAME_SIZE;
287
                    break;
288
                case CODEC_ID_PCM_S16LE:
289
                case CODEC_ID_PCM_S16BE:
290
                case CODEC_ID_PCM_U16LE:
291
                case CODEC_ID_PCM_U16BE:
292
                case CODEC_ID_PCM_S8:
293
                case CODEC_ID_PCM_U8:
294
                case CODEC_ID_PCM_ALAW:
295
                case CODEC_ID_PCM_MULAW:
296
                    st->codec->frame_size = 1;
297
                    break;
298
                default:
299
                    /* This is probably wrong, but it prevents a crash later */
300
                    st->codec->frame_size = 1;
301
                    break;
302
                }
303
            } else if (type == CODEC_TYPE_VIDEO) {
304
                get_le32(pb);
305
                get_le32(pb);
306
                get_byte(pb);
307
                size = get_le16(pb); /* size */
308
                sizeX= get_le32(pb); /* size */
309
                st->codec->width = get_le32(pb);
310
                st->codec->height = get_le32(pb);
311
                /* not available for asf */
312
                get_le16(pb); /* panes */
313
                st->codec->bits_per_sample = get_le16(pb); /* depth */
314
                tag1 = get_le32(pb);
315
                url_fskip(pb, 20);
316
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
317
                size= sizeX;
318
                if (size > 40) {
319
                    st->codec->extradata_size = size - 40;
320
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
321
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
322
                }
323

    
324
        /* Extract palette from extradata if bpp <= 8 */
325
        /* This code assumes that extradata contains only palette */
326
        /* This is true for all paletted codecs implemented in ffmpeg */
327
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
328
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
329
#ifdef WORDS_BIGENDIAN
330
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
331
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
332
#else
333
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
334
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
335
#endif
336
            st->codec->palctrl->palette_changed = 1;
337
        }
338

    
339
                st->codec->codec_tag = tag1;
340
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
341
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
342
                    st->need_parsing = AVSTREAM_PARSE_FULL;
343
            }
344
            pos2 = url_ftell(pb);
345
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
346
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
347
            int len1, len2, len3, len4, len5;
348

    
349
            len1 = get_le16(pb);
350
            len2 = get_le16(pb);
351
            len3 = get_le16(pb);
352
            len4 = get_le16(pb);
353
            len5 = get_le16(pb);
354
            get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
355
            get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
356
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
357
            get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
358
            url_fskip(pb, len5);
359
        } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
360
            int stream_count = get_le16(pb);
361
            int j;
362

    
363
//            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
364
//            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
365
            for(j = 0; j < stream_count; j++) {
366
                int flags, bitrate, stream_id;
367

    
368
                flags= get_le16(pb);
369
                bitrate= get_le32(pb);
370
                stream_id= (flags & 0x7f);
371
//                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
372
                asf->stream_bitrates[stream_id-1]= bitrate;
373
            }
374
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
375
                int desc_count, i;
376

    
377
                desc_count = get_le16(pb);
378
                for(i=0;i<desc_count;i++)
379
                {
380
                        int name_len,value_type,value_len;
381
                        uint64_t value_num = 0;
382
                        char name[1024];
383

    
384
                        name_len = get_le16(pb);
385
                        get_str16_nolen(pb, name_len, name, sizeof(name));
386
                        value_type = get_le16(pb);
387
                        value_len = get_le16(pb);
388
                        if ((value_type == 0) || (value_type == 1)) // unicode or byte
389
                        {
390
                                if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
391
                                else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
392
                                else if(!strcmp(name,"WM/Track")) {
393
                                    char track[8];
394
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
395
                                    s->track = strtol(track, NULL, 10) + 1;
396
                                }
397
                                else if(!strcmp(name,"WM/TrackNumber")) {
398
                                    char track[8];
399
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
400
                                    s->track = strtol(track, NULL, 10);
401
                                }
402
                                else url_fskip(pb, value_len);
403
                        }
404
                        if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
405
                        {
406
                                value_num= get_value(pb, value_type);
407
                                if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
408
                                if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
409
                        }
410
                }
411
        } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
412
            int n, stream_num, name_len, value_len, value_type, value_num;
413
            n = get_le16(pb);
414

    
415
            for(i=0;i<n;i++) {
416
                char name[1024];
417

    
418
                get_le16(pb); //lang_list_index
419
                stream_num= get_le16(pb);
420
                name_len=   get_le16(pb);
421
                value_type= get_le16(pb);
422
                value_len=  get_le32(pb);
423

    
424
                get_str16_nolen(pb, name_len, name, sizeof(name));
425
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
426
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
427
                url_fskip(pb, value_len - 2);
428

    
429
                if(stream_num<128){
430
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
431
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
432
                }
433
            }
434
        } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
435
            int ext_len, payload_ext_ct, stream_ct;
436
            uint32_t ext_d, leak_rate, stream_num;
437
            int64_t pos_ex_st;
438
            pos_ex_st = url_ftell(pb);
439

    
440
            get_le64(pb); // starttime
441
            get_le64(pb); // endtime
442
            leak_rate = get_le32(pb); // leak-datarate
443
            get_le32(pb); // bucket-datasize
444
            get_le32(pb); // init-bucket-fullness
445
            get_le32(pb); // alt-leak-datarate
446
            get_le32(pb); // alt-bucket-datasize
447
            get_le32(pb); // alt-init-bucket-fullness
448
            get_le32(pb); // max-object-size
449
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
450
            stream_num = get_le16(pb); // stream-num
451
            get_le16(pb); // stream-language-id-index
452
            get_le64(pb); // avg frametime in 100ns units
453
            stream_ct = get_le16(pb); //stream-name-count
454
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
455

    
456
            if (stream_num < 128)
457
                bitrate[stream_num] = leak_rate;
458

    
459
            for (i=0; i<stream_ct; i++){
460
                get_le16(pb);
461
                ext_len = get_le16(pb);
462
                url_fseek(pb, ext_len, SEEK_CUR);
463
            }
464

    
465
            for (i=0; i<payload_ext_ct; i++){
466
                get_guid(pb, &g);
467
                ext_d=get_le16(pb);
468
                ext_len=get_le32(pb);
469
                url_fseek(pb, ext_len, SEEK_CUR);
470
            }
471

    
472
            // there could be a optional stream properties object to follow
473
            // if so the next iteration will pick it up
474
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
475
            int v1, v2;
476
            get_guid(pb, &g);
477
            v1 = get_le32(pb);
478
            v2 = get_le16(pb);
479
#if 0
480
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
481
            int len, v1, n, num;
482
            char str[256], *q;
483
            char tag[16];
484

485
            get_guid(pb, &g);
486
            print_guid(&g);
487

488
            n = get_le32(pb);
489
            for(i=0;i<n;i++) {
490
                num = get_le16(pb); /* stream number */
491
                get_str16(pb, str, sizeof(str));
492
                get_str16(pb, str, sizeof(str));
493
                len = get_le16(pb);
494
                q = tag;
495
                while (len > 0) {
496
                    v1 = get_byte(pb);
497
                    if ((q - tag) < sizeof(tag) - 1)
498
                        *q++ = v1;
499
                    len--;
500
                }
501
                *q = '\0';
502
            }
503
#endif
504
        } else if (url_feof(pb)) {
505
            goto fail;
506
        } else {
507
            url_fseek(pb, gsize - 24, SEEK_CUR);
508
        }
509
    }
510
    get_guid(pb, &g);
511
    get_le64(pb);
512
    get_byte(pb);
513
    get_byte(pb);
514
    if (url_feof(pb))
515
        goto fail;
516
    asf->data_offset = url_ftell(pb);
517
    asf->packet_size_left = 0;
518

    
519

    
520
    for(i=0; i<128; i++){
521
        int stream_num= asf->asfid2avid[i];
522
        if(stream_num>=0){
523
            AVCodecContext *codec= s->streams[stream_num]->codec;
524
            if (!codec->bit_rate)
525
                codec->bit_rate = bitrate[i];
526
            if (dar[i].num > 0 && dar[i].den > 0)
527
                av_reduce(&codec->sample_aspect_ratio.num,
528
                          &codec->sample_aspect_ratio.den,
529
                          dar[i].num, dar[i].den, INT_MAX);
530
//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);
531
        }
532
    }
533

    
534
    return 0;
535

    
536
 fail:
537
     for(i=0;i<s->nb_streams;i++) {
538
        AVStream *st = s->streams[i];
539
        if (st) {
540
            av_free(st->priv_data);
541
            av_free(st->codec->extradata);
542
        }
543
        av_free(st);
544
    }
545
    return -1;
546
}
547

    
548
#define DO_2BITS(bits, var, defval) \
549
    switch (bits & 3) \
550
    { \
551
    case 3: var = get_le32(pb); rsize += 4; break; \
552
    case 2: var = get_le16(pb); rsize += 2; break; \
553
    case 1: var = get_byte(pb); rsize++; break; \
554
    default: var = defval; break; \
555
    }
556

    
557
/**
558
 *
559
 * @return <0 in case of an error
560
 */
561
static int asf_get_packet(AVFormatContext *s)
562
{
563
    ASFContext *asf = s->priv_data;
564
    ByteIOContext *pb = &s->pb;
565
    uint32_t packet_length, padsize;
566
    int rsize = 8;
567
    int c, d, e, off;
568

    
569
    off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
570

    
571
    c=d=e=-1;
572
    while(off-- > 0){
573
        c=d; d=e;
574
        e= get_byte(pb);
575
        if(c == 0x82 && !d && !e)
576
            break;
577
    }
578

    
579
    if (c != 0x82) {
580
        if (!url_feof(pb))
581
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
582
    }
583
    if ((c & 0x8f) == 0x82) {
584
        if (d || e) {
585
            if (!url_feof(pb))
586
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
587
            return -1;
588
        }
589
        c= get_byte(pb);
590
        d= get_byte(pb);
591
        rsize+=3;
592
    }else{
593
        url_fseek(pb, -1, SEEK_CUR); //FIXME
594
    }
595

    
596
    asf->packet_flags    = c;
597
    asf->packet_property = d;
598

    
599
    DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
600
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
601
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
602

    
603
    //the following checks prevent overflows and infinite loops
604
    if(packet_length >= (1U<<29)){
605
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
606
        return -1;
607
    }
608
    if(padsize >= packet_length){
609
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
610
        return -1;
611
    }
612

    
613
    asf->packet_timestamp = get_le32(pb);
614
    get_le16(pb); /* duration */
615
    // rsize has at least 11 bytes which have to be present
616

    
617
    if (asf->packet_flags & 0x01) {
618
        asf->packet_segsizetype = get_byte(pb); rsize++;
619
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
620
    } else {
621
        asf->packet_segments = 1;
622
        asf->packet_segsizetype = 0x80;
623
    }
624
    asf->packet_size_left = packet_length - padsize - rsize;
625
    if (packet_length < asf->hdr.min_pktsize)
626
        padsize += asf->hdr.min_pktsize - packet_length;
627
    asf->packet_padsize = padsize;
628
#ifdef DEBUG
629
    printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
630
#endif
631
    return 0;
632
}
633

    
634
/**
635
 *
636
 * @return <0 if error
637
 */
638
static int asf_read_frame_header(AVFormatContext *s){
639
    ASFContext *asf = s->priv_data;
640
    ByteIOContext *pb = &s->pb;
641
    int rsize = 1;
642
    int num = get_byte(pb);
643
    int64_t ts0, ts1;
644

    
645
    asf->packet_segments--;
646
    asf->packet_key_frame = num >> 7;
647
    asf->stream_index = asf->asfid2avid[num & 0x7f];
648
    // sequence should be ignored!
649
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
650
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
651
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
652
//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);
653
    if (asf->packet_replic_size >= 8) {
654
        asf->packet_obj_size = get_le32(pb);
655
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
656
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
657
            return -1;
658
        }
659
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
660
        if(asf->packet_replic_size >= 8+38+4){
661
//            for(i=0; i<asf->packet_replic_size-8; i++)
662
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
663
//            av_log(s, AV_LOG_DEBUG, "\n");
664
            url_fskip(pb, 10);
665
            ts0= get_le64(pb);
666
            ts1= get_le64(pb);
667
            url_fskip(pb, 12);
668
            get_le32(pb);
669
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
670
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
671
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
672
        }else
673
            url_fskip(pb, asf->packet_replic_size - 8);
674
        rsize += asf->packet_replic_size; // FIXME - check validity
675
    } else if (asf->packet_replic_size==1){
676
        // multipacket - frag_offset is begining timestamp
677
        asf->packet_time_start = asf->packet_frag_offset;
678
        asf->packet_frag_offset = 0;
679
        asf->packet_frag_timestamp = asf->packet_timestamp;
680

    
681
        asf->packet_time_delta = get_byte(pb);
682
        rsize++;
683
    }else if(asf->packet_replic_size!=0){
684
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
685
        return -1;
686
    }
687
    if (asf->packet_flags & 0x01) {
688
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
689
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
690
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
691
            return -1;
692
        }
693
        //printf("Fragsize %d\n", asf->packet_frag_size);
694
    } else {
695
        asf->packet_frag_size = asf->packet_size_left - rsize;
696
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
697
    }
698
    if (asf->packet_replic_size == 1) {
699
        asf->packet_multi_size = asf->packet_frag_size;
700
        if (asf->packet_multi_size > asf->packet_size_left)
701
            return -1;
702
    }
703
    asf->packet_size_left -= rsize;
704
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
705

    
706
    return 0;
707
}
708

    
709
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
710
{
711
    ASFContext *asf = s->priv_data;
712
    ASFStream *asf_st = 0;
713
    ByteIOContext *pb = &s->pb;
714
    //static int pc = 0;
715
    for (;;) {
716
        if(url_feof(pb))
717
            return AVERROR(EIO);
718
        if (asf->packet_size_left < FRAME_HEADER_SIZE
719
            || asf->packet_segments < 1) {
720
            //asf->packet_size_left <= asf->packet_padsize) {
721
            int ret = asf->packet_size_left + asf->packet_padsize;
722
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
723
            assert(ret>=0);
724
            /* fail safe */
725
            url_fskip(pb, ret);
726

    
727
            asf->packet_pos= url_ftell(&s->pb);
728
            if (asf->data_object_size != (uint64_t)-1 &&
729
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
730
                return AVERROR(EIO); /* Do not exceed the size of the data object */
731
            ret = asf_get_packet(s);
732
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
733
            if (ret < 0)
734
                assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
735
            asf->packet_time_start = 0;
736
            continue;
737
        }
738
        if (asf->packet_time_start == 0) {
739
            if(asf_read_frame_header(s) < 0){
740
                asf->packet_segments= 0;
741
                continue;
742
            }
743
            if (asf->stream_index < 0
744
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
745
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
746
                ) {
747
                asf->packet_time_start = 0;
748
                /* unhandled packet (should not happen) */
749
                url_fskip(pb, asf->packet_frag_size);
750
                asf->packet_size_left -= asf->packet_frag_size;
751
                if(asf->stream_index < 0)
752
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
753
                continue;
754
            }
755
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
756
        }
757
        asf_st = asf->asf_st;
758

    
759
        if (asf->packet_replic_size == 1) {
760
            // frag_offset is here used as the begining timestamp
761
            asf->packet_frag_timestamp = asf->packet_time_start;
762
            asf->packet_time_start += asf->packet_time_delta;
763
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
764
            asf->packet_size_left--;
765
            asf->packet_multi_size--;
766
            if (asf->packet_multi_size < asf->packet_obj_size)
767
            {
768
                asf->packet_time_start = 0;
769
                url_fskip(pb, asf->packet_multi_size);
770
                asf->packet_size_left -= asf->packet_multi_size;
771
                continue;
772
            }
773
            asf->packet_multi_size -= asf->packet_obj_size;
774
            //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);
775
        }
776
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
777
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
778
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
779
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
780
                asf_st->frag_offset, asf->packet_frag_size,
781
                asf->packet_obj_size, asf_st->pkt.size);
782
            asf->packet_obj_size= asf_st->pkt.size;
783
        }
784

    
785
        if (   asf_st->pkt.size != asf->packet_obj_size
786
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
787
            if(asf_st->pkt.data){
788
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
789
                asf_st->frag_offset = 0;
790
                av_free_packet(&asf_st->pkt);
791
            }
792
            /* new packet */
793
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
794
            asf_st->seq = asf->packet_seq;
795
            asf_st->pkt.pts = asf->packet_frag_timestamp;
796
            asf_st->pkt.stream_index = asf->stream_index;
797
            asf_st->pkt.pos =
798
            asf_st->packet_pos= asf->packet_pos;
799
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
800
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
801
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
802
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
803
                asf->packet_key_frame = 1;
804
            if (asf->packet_key_frame)
805
                asf_st->pkt.flags |= PKT_FLAG_KEY;
806
        }
807

    
808
        /* read data */
809
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
810
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
811
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
812
        asf->packet_size_left -= asf->packet_frag_size;
813
        if (asf->packet_size_left < 0)
814
            continue;
815

    
816
        if(   asf->packet_frag_offset >= asf_st->pkt.size
817
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
818
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
819
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
820
            continue;
821
        }
822

    
823
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
824
                   asf->packet_frag_size);
825
        asf_st->frag_offset += asf->packet_frag_size;
826
        /* test if whole packet is read */
827
        if (asf_st->frag_offset == asf_st->pkt.size) {
828
            /* return packet */
829
            if (asf_st->ds_span > 1) {
830
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
831
                    av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
832
              }else{
833
                /* packet descrambling */
834
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
835
                if (newdata) {
836
                    int offset = 0;
837
                    while (offset < asf_st->pkt.size) {
838
                        int off = offset / asf_st->ds_chunk_size;
839
                        int row = off / asf_st->ds_span;
840
                        int col = off % asf_st->ds_span;
841
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
842
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
843

    
844
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
845
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
846
                        memcpy(newdata + offset,
847
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
848
                               asf_st->ds_chunk_size);
849
                        offset += asf_st->ds_chunk_size;
850
                    }
851
                    av_free(asf_st->pkt.data);
852
                    asf_st->pkt.data = newdata;
853
                }
854
              }
855
            }
856
            asf_st->frag_offset = 0;
857
            *pkt= asf_st->pkt;
858
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
859
            asf_st->pkt.size = 0;
860
            asf_st->pkt.data = 0;
861
            break; // packet completed
862
        }
863
    }
864
    return 0;
865
}
866

    
867
static int asf_read_close(AVFormatContext *s)
868
{
869
    int i;
870

    
871
    for(i=0;i<s->nb_streams;i++) {
872
        AVStream *st = s->streams[i];
873
        av_free(st->priv_data);
874
        av_free(st->codec->palctrl);
875
    }
876
    return 0;
877
}
878

    
879
// Added to support seeking after packets have been read
880
// If information is not reset, read_packet fails due to
881
// leftover information from previous reads
882
static void asf_reset_header(AVFormatContext *s)
883
{
884
    ASFContext *asf = s->priv_data;
885
    ASFStream *asf_st;
886
    int i;
887

    
888
    asf->packet_nb_frames = 0;
889
    asf->packet_size_left = 0;
890
    asf->packet_segments = 0;
891
    asf->packet_flags = 0;
892
    asf->packet_property = 0;
893
    asf->packet_timestamp = 0;
894
    asf->packet_segsizetype = 0;
895
    asf->packet_segments = 0;
896
    asf->packet_seq = 0;
897
    asf->packet_replic_size = 0;
898
    asf->packet_key_frame = 0;
899
    asf->packet_padsize = 0;
900
    asf->packet_frag_offset = 0;
901
    asf->packet_frag_size = 0;
902
    asf->packet_frag_timestamp = 0;
903
    asf->packet_multi_size = 0;
904
    asf->packet_obj_size = 0;
905
    asf->packet_time_delta = 0;
906
    asf->packet_time_start = 0;
907

    
908
    for(i=0; i<s->nb_streams; i++){
909
        asf_st= s->streams[i]->priv_data;
910
        av_free_packet(&asf_st->pkt);
911
        asf_st->frag_offset=0;
912
        asf_st->seq=0;
913
    }
914
    asf->asf_st= NULL;
915
}
916

    
917
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
918
{
919
    ASFContext *asf = s->priv_data;
920
    AVPacket pkt1, *pkt = &pkt1;
921
    ASFStream *asf_st;
922
    int64_t pts;
923
    int64_t pos= *ppos;
924
    int i;
925
    int64_t start_pos[s->nb_streams];
926

    
927
    for(i=0; i<s->nb_streams; i++){
928
        start_pos[i]= pos;
929
    }
930

    
931
    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
932
    *ppos= pos;
933
    url_fseek(&s->pb, pos, SEEK_SET);
934

    
935
//printf("asf_read_pts\n");
936
    asf_reset_header(s);
937
    for(;;){
938
        if (av_read_frame(s, pkt) < 0){
939
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
940
            return AV_NOPTS_VALUE;
941
        }
942

    
943
        pts= pkt->pts;
944

    
945
        av_free_packet(pkt);
946
        if(pkt->flags&PKT_FLAG_KEY){
947
            i= pkt->stream_index;
948

    
949
            asf_st= s->streams[i]->priv_data;
950

    
951
//            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
952
            pos= asf_st->packet_pos;
953

    
954
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
955
            start_pos[i]= asf_st->packet_pos + 1;
956

    
957
            if(pkt->stream_index == stream_index)
958
               break;
959
        }
960
    }
961

    
962
    *ppos= pos;
963
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
964

    
965
    return pts;
966
}
967

    
968
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
969
{
970
    GUID g;
971
    ASFContext *asf = s->priv_data;
972
    int64_t gsize, itime;
973
    int64_t pos, current_pos, index_pts;
974
    int i;
975
    int pct,ict;
976

    
977
    current_pos = url_ftell(&s->pb);
978

    
979
    url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
980
    get_guid(&s->pb, &g);
981
    if (!memcmp(&g, &index_guid, sizeof(GUID))) {
982
        gsize = get_le64(&s->pb);
983
        get_guid(&s->pb, &g);
984
        itime=get_le64(&s->pb);
985
        pct=get_le32(&s->pb);
986
        ict=get_le32(&s->pb);
987
        av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
988

    
989
        for (i=0;i<ict;i++){
990
            int pktnum=get_le32(&s->pb);
991
            int pktct =get_le16(&s->pb);
992
            av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
993

    
994
            pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
995
            index_pts=av_rescale(itime, i, 10000);
996

    
997
            av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
998
        }
999
        asf->index_read= 1;
1000
    }
1001
    url_fseek(&s->pb, current_pos, SEEK_SET);
1002
}
1003

    
1004
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1005
{
1006
    ASFContext *asf = s->priv_data;
1007
    AVStream *st = s->streams[stream_index];
1008
    int64_t pos;
1009
    int index;
1010

    
1011
    if (asf->packet_size <= 0)
1012
        return -1;
1013

    
1014
    if (!asf->index_read)
1015
        asf_build_simple_index(s, stream_index);
1016

    
1017
    if(!(asf->index_read && st->index_entries)){
1018
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1019
            return -1;
1020
    }else{
1021
        index= av_index_search_timestamp(st, pts, flags);
1022
        if(index<0)
1023
            return -1;
1024

    
1025
        /* find the position */
1026
        pos = st->index_entries[index].pos;
1027
        pts = st->index_entries[index].timestamp;
1028

    
1029
    // various attempts to find key frame have failed so far
1030
    //    asf_reset_header(s);
1031
    //    url_fseek(&s->pb, pos, SEEK_SET);
1032
    //    key_pos = pos;
1033
    //     for(i=0;i<16;i++){
1034
    //         pos = url_ftell(&s->pb);
1035
    //         if (av_read_frame(s, &pkt) < 0){
1036
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1037
    //             return -1;
1038
    //         }
1039
    //         asf_st = s->streams[stream_index]->priv_data;
1040
    //         pos += st->parser->frame_offset;
1041
    //
1042
    //         if (pkt.size > b) {
1043
    //             b = pkt.size;
1044
    //             key_pos = pos;
1045
    //         }
1046
    //
1047
    //         av_free_packet(&pkt);
1048
    //     }
1049

    
1050
        /* do the seek */
1051
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1052
        url_fseek(&s->pb, pos, SEEK_SET);
1053
    }
1054
    asf_reset_header(s);
1055
    return 0;
1056
}
1057

    
1058
AVInputFormat asf_demuxer = {
1059
    "asf",
1060
    "asf format",
1061
    sizeof(ASFContext),
1062
    asf_probe,
1063
    asf_read_header,
1064
    asf_read_packet,
1065
    asf_read_close,
1066
    asf_read_seek,
1067
    asf_read_pts,
1068
};