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ffmpeg / libavformat / asf.c @ 24c3da16

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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
 *
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 * 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
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
#include "libavutil/common.h"
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#include "libavcodec/mpegaudio.h"
24
#include "avformat.h"
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#include "riff.h"
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#include "asf.h"
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#include "asfcrypt.h"
28

    
29
extern void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
30

    
31
#undef NDEBUG
32
#include <assert.h>
33

    
34
#define FRAME_HEADER_SIZE 17
35
// Fix Me! FRAME_HEADER_SIZE may be different.
36

    
37
static const GUID index_guid = {
38
    0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
39
};
40

    
41
static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
42
    0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
43
};
44
/**********************************/
45
/* decoding */
46

    
47
//#define DEBUG
48

    
49
#ifdef DEBUG
50
#define PRINT_IF_GUID(g,cmp) \
51
if (!memcmp(g, &cmp, sizeof(GUID))) \
52
    dprintf(NULL, "(GUID: %s) ", #cmp)
53

    
54
static void print_guid(const GUID *g)
55
{
56
    int i;
57
    PRINT_IF_GUID(g, asf_header);
58
    else PRINT_IF_GUID(g, file_header);
59
    else PRINT_IF_GUID(g, stream_header);
60
    else PRINT_IF_GUID(g, audio_stream);
61
    else PRINT_IF_GUID(g, audio_conceal_none);
62
    else PRINT_IF_GUID(g, video_stream);
63
    else PRINT_IF_GUID(g, video_conceal_none);
64
    else PRINT_IF_GUID(g, command_stream);
65
    else PRINT_IF_GUID(g, comment_header);
66
    else PRINT_IF_GUID(g, codec_comment_header);
67
    else PRINT_IF_GUID(g, codec_comment1_header);
68
    else PRINT_IF_GUID(g, data_header);
69
    else PRINT_IF_GUID(g, index_guid);
70
    else PRINT_IF_GUID(g, head1_guid);
71
    else PRINT_IF_GUID(g, head2_guid);
72
    else PRINT_IF_GUID(g, my_guid);
73
    else PRINT_IF_GUID(g, ext_stream_header);
74
    else PRINT_IF_GUID(g, extended_content_header);
75
    else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
76
    else PRINT_IF_GUID(g, ext_stream_audio_stream);
77
    else PRINT_IF_GUID(g, metadata_header);
78
    else PRINT_IF_GUID(g, stream_bitrate_guid);
79
    else
80
        dprintf(NULL, "(GUID: unknown) ");
81
    for(i=0;i<16;i++)
82
        dprintf(NULL, " 0x%02x,", (*g)[i]);
83
    dprintf(NULL, "}\n");
84
}
85
#undef PRINT_IF_GUID
86
#else
87
#define print_guid(g)
88
#endif
89

    
90
static void get_guid(ByteIOContext *s, GUID *g)
91
{
92
    assert(sizeof(*g) == 16);
93
    get_buffer(s, *g, sizeof(*g));
94
}
95

    
96
#if 0
97
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
98
{
99
    int len, c;
100
    char *q;
101

102
    len = get_le16(pb);
103
    q = buf;
104
    while (len > 0) {
105
        c = get_le16(pb);
106
        if ((q - buf) < buf_size - 1)
107
            *q++ = c;
108
        len--;
109
    }
110
    *q = '\0';
111
}
112
#endif
113

    
114
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
115
{
116
    char* q = buf;
117
    len /= 2;
118
    while (len--) {
119
        uint8_t tmp;
120
        PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
121
    }
122
    *q = '\0';
123
}
124

    
125
static int asf_probe(AVProbeData *pd)
126
{
127
    /* check file header */
128
    if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
129
        return AVPROBE_SCORE_MAX;
130
    else
131
        return 0;
132
}
133

    
134
static int get_value(ByteIOContext *pb, int type){
135
    switch(type){
136
        case 2: return get_le32(pb);
137
        case 3: return get_le32(pb);
138
        case 4: return get_le64(pb);
139
        case 5: return get_le16(pb);
140
        default:return INT_MIN;
141
    }
142
}
143

    
144
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
145
{
146
    ASFContext *asf = s->priv_data;
147
    GUID g;
148
    ByteIOContext *pb = s->pb;
149
    AVStream *st;
150
    ASFStream *asf_st;
151
    int size, i;
152
    int64_t gsize;
153
    AVRational dar[128];
154
    uint32_t bitrate[128];
155

    
156
    memset(dar, 0, sizeof(dar));
157
    memset(bitrate, 0, sizeof(bitrate));
158

    
159
    get_guid(pb, &g);
160
    if (memcmp(&g, &asf_header, sizeof(GUID)))
161
        return -1;
162
    get_le64(pb);
163
    get_le32(pb);
164
    get_byte(pb);
165
    get_byte(pb);
166
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
167
    for(;;) {
168
        get_guid(pb, &g);
169
        gsize = get_le64(pb);
170
        dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
171
        print_guid(&g);
172
        dprintf(s, "  size=0x%"PRIx64"\n", gsize);
173
        if (!memcmp(&g, &data_header, sizeof(GUID))) {
174
            asf->data_object_offset = url_ftell(pb);
175
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
176
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
177
                asf->data_object_size = gsize - 24;
178
            } else {
179
                asf->data_object_size = (uint64_t)-1;
180
            }
181
            break;
182
        }
183
        if (gsize < 24)
184
            return -1;
185
        if (!memcmp(&g, &file_header, sizeof(GUID))) {
186
            get_guid(pb, &asf->hdr.guid);
187
            asf->hdr.file_size          = get_le64(pb);
188
            asf->hdr.create_time        = get_le64(pb);
189
            asf->nb_packets             = get_le64(pb);
190
            asf->hdr.play_time          = get_le64(pb);
191
            asf->hdr.send_time          = get_le64(pb);
192
            asf->hdr.preroll            = get_le32(pb);
193
            asf->hdr.ignore             = get_le32(pb);
194
            asf->hdr.flags              = get_le32(pb);
195
            asf->hdr.min_pktsize        = get_le32(pb);
196
            asf->hdr.max_pktsize        = get_le32(pb);
197
            asf->hdr.max_bitrate        = get_le32(pb);
198
            asf->packet_size = asf->hdr.max_pktsize;
199
        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
200
            int type, type_specific_size, sizeX;
201
            uint64_t total_size;
202
            unsigned int tag1;
203
            int64_t pos1, pos2, start_time;
204
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
205

    
206
            pos1 = url_ftell(pb);
207

    
208
            st = av_new_stream(s, 0);
209
            if (!st)
210
                return AVERROR(ENOMEM);
211
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
212
            asf_st = av_mallocz(sizeof(ASFStream));
213
            if (!asf_st)
214
                return AVERROR(ENOMEM);
215
            st->priv_data = asf_st;
216
            start_time = asf->hdr.preroll;
217

    
218
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
219
                st->duration = asf->hdr.send_time /
220
                    (10000000 / 1000) - start_time;
221
            }
222
            get_guid(pb, &g);
223

    
224
            test_for_ext_stream_audio = 0;
225
            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
226
                type = CODEC_TYPE_AUDIO;
227
            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
228
                type = CODEC_TYPE_VIDEO;
229
            } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
230
                type = CODEC_TYPE_DATA;
231
            } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
232
                test_for_ext_stream_audio = 1;
233
                type = CODEC_TYPE_UNKNOWN;
234
            } else {
235
                return -1;
236
            }
237
            get_guid(pb, &g);
238
            total_size = get_le64(pb);
239
            type_specific_size = get_le32(pb);
240
            get_le32(pb);
241
            st->id = get_le16(pb) & 0x7f; /* stream id */
242
            // mapping of asf ID to AV stream ID;
243
            asf->asfid2avid[st->id] = s->nb_streams - 1;
244

    
245
            get_le32(pb);
246

    
247
            if (test_for_ext_stream_audio) {
248
                get_guid(pb, &g);
249
                if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
250
                    type = CODEC_TYPE_AUDIO;
251
                    is_dvr_ms_audio=1;
252
                    get_guid(pb, &g);
253
                    get_le32(pb);
254
                    get_le32(pb);
255
                    get_le32(pb);
256
                    get_guid(pb, &g);
257
                    get_le32(pb);
258
                }
259
            }
260

    
261
            st->codec->codec_type = type;
262
            if (type == CODEC_TYPE_AUDIO) {
263
                get_wav_header(pb, st->codec, type_specific_size);
264
                if (is_dvr_ms_audio) {
265
                    // codec_id and codec_tag are unreliable in dvr_ms
266
                    // files. Set them later by probing stream.
267
                    st->codec->codec_id = CODEC_ID_PROBE;
268
                    st->codec->codec_tag = 0;
269
                }
270
                st->need_parsing = AVSTREAM_PARSE_FULL;
271
                /* We have to init the frame size at some point .... */
272
                pos2 = url_ftell(pb);
273
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
274
                    asf_st->ds_span = get_byte(pb);
275
                    asf_st->ds_packet_size = get_le16(pb);
276
                    asf_st->ds_chunk_size = get_le16(pb);
277
                    get_le16(pb); //ds_data_size
278
                    get_byte(pb); //ds_silence_data
279
                }
280
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
281
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
282
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
283
                if (asf_st->ds_span > 1) {
284
                    if (!asf_st->ds_chunk_size
285
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
286
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
287
                        asf_st->ds_span = 0; // disable descrambling
288
                }
289
                switch (st->codec->codec_id) {
290
                case CODEC_ID_MP3:
291
                    st->codec->frame_size = MPA_FRAME_SIZE;
292
                    break;
293
                case CODEC_ID_PCM_S16LE:
294
                case CODEC_ID_PCM_S16BE:
295
                case CODEC_ID_PCM_U16LE:
296
                case CODEC_ID_PCM_U16BE:
297
                case CODEC_ID_PCM_S8:
298
                case CODEC_ID_PCM_U8:
299
                case CODEC_ID_PCM_ALAW:
300
                case CODEC_ID_PCM_MULAW:
301
                    st->codec->frame_size = 1;
302
                    break;
303
                default:
304
                    /* This is probably wrong, but it prevents a crash later */
305
                    st->codec->frame_size = 1;
306
                    break;
307
                }
308
            } else if (type == CODEC_TYPE_VIDEO) {
309
                get_le32(pb);
310
                get_le32(pb);
311
                get_byte(pb);
312
                size = get_le16(pb); /* size */
313
                sizeX= get_le32(pb); /* size */
314
                st->codec->width = get_le32(pb);
315
                st->codec->height = get_le32(pb);
316
                /* not available for asf */
317
                get_le16(pb); /* panes */
318
                st->codec->bits_per_sample = get_le16(pb); /* depth */
319
                tag1 = get_le32(pb);
320
                url_fskip(pb, 20);
321
//                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
322
                size= sizeX;
323
                if (size > 40) {
324
                    st->codec->extradata_size = size - 40;
325
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
326
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
327
                }
328

    
329
        /* Extract palette from extradata if bpp <= 8 */
330
        /* This code assumes that extradata contains only palette */
331
        /* This is true for all paletted codecs implemented in ffmpeg */
332
        if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
333
            st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
334
#ifdef WORDS_BIGENDIAN
335
            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
336
                st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
337
#else
338
            memcpy(st->codec->palctrl->palette, st->codec->extradata,
339
                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
340
#endif
341
            st->codec->palctrl->palette_changed = 1;
342
        }
343

    
344
                st->codec->codec_tag = tag1;
345
                st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
346
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
347
                    st->need_parsing = AVSTREAM_PARSE_FULL;
348
            }
349
            pos2 = url_ftell(pb);
350
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
351
        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
352
            int len1, len2, len3, len4, len5;
353

    
354
            len1 = get_le16(pb);
355
            len2 = get_le16(pb);
356
            len3 = get_le16(pb);
357
            len4 = get_le16(pb);
358
            len5 = get_le16(pb);
359
            get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
360
            get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
361
            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
362
            get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
363
            url_fskip(pb, len5);
364
        } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
365
            int stream_count = get_le16(pb);
366
            int j;
367

    
368
//            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
369
//            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
370
            for(j = 0; j < stream_count; j++) {
371
                int flags, bitrate, stream_id;
372

    
373
                flags= get_le16(pb);
374
                bitrate= get_le32(pb);
375
                stream_id= (flags & 0x7f);
376
//                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
377
                asf->stream_bitrates[stream_id]= bitrate;
378
            }
379
       } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
380
                int desc_count, i;
381

    
382
                desc_count = get_le16(pb);
383
                for(i=0;i<desc_count;i++)
384
                {
385
                        int name_len,value_type,value_len;
386
                        uint64_t value_num = 0;
387
                        char name[1024];
388

    
389
                        name_len = get_le16(pb);
390
                        get_str16_nolen(pb, name_len, name, sizeof(name));
391
                        value_type = get_le16(pb);
392
                        value_len = get_le16(pb);
393
                        if (value_type <= 1) // unicode or byte
394
                        {
395
                                if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
396
                                else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
397
                                else if(!strcmp(name,"WM/Year"      )) {
398
                                    char year[8];
399
                                    get_str16_nolen(pb, value_len, year, sizeof(year));
400
                                    s->year = atoi(year);
401
                                }
402
                                else if(!strcmp(name,"WM/Track") && s->track == 0) {
403
                                    char track[8];
404
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
405
                                    s->track = strtol(track, NULL, 10) + 1;
406
                                }
407
                                else if(!strcmp(name,"WM/TrackNumber")) {
408
                                    char track[8];
409
                                    get_str16_nolen(pb, value_len, track, sizeof(track));
410
                                    s->track = strtol(track, NULL, 10);
411
                                }
412
                                else url_fskip(pb, value_len);
413
                        }
414
                        else if (value_type <= 5) // boolean or DWORD or QWORD or WORD
415
                        {
416
                                value_num= get_value(pb, value_type);
417
                                if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
418
                                if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
419
                        }else
420
                            url_fskip(pb, value_len);
421
                }
422
        } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
423
            int n, stream_num, name_len, value_len, value_type, value_num;
424
            n = get_le16(pb);
425

    
426
            for(i=0;i<n;i++) {
427
                char name[1024];
428

    
429
                get_le16(pb); //lang_list_index
430
                stream_num= get_le16(pb);
431
                name_len=   get_le16(pb);
432
                value_type= get_le16(pb);
433
                value_len=  get_le32(pb);
434

    
435
                get_str16_nolen(pb, name_len, name, sizeof(name));
436
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
437
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
438
                url_fskip(pb, value_len - 2);
439

    
440
                if(stream_num<128){
441
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
442
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
443
                }
444
            }
445
        } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
446
            int ext_len, payload_ext_ct, stream_ct;
447
            uint32_t ext_d, leak_rate, stream_num;
448
            int64_t pos_ex_st;
449
            pos_ex_st = url_ftell(pb);
450

    
451
            get_le64(pb); // starttime
452
            get_le64(pb); // endtime
453
            leak_rate = get_le32(pb); // leak-datarate
454
            get_le32(pb); // bucket-datasize
455
            get_le32(pb); // init-bucket-fullness
456
            get_le32(pb); // alt-leak-datarate
457
            get_le32(pb); // alt-bucket-datasize
458
            get_le32(pb); // alt-init-bucket-fullness
459
            get_le32(pb); // max-object-size
460
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
461
            stream_num = get_le16(pb); // stream-num
462
            get_le16(pb); // stream-language-id-index
463
            get_le64(pb); // avg frametime in 100ns units
464
            stream_ct = get_le16(pb); //stream-name-count
465
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
466

    
467
            if (stream_num < 128)
468
                bitrate[stream_num] = leak_rate;
469

    
470
            for (i=0; i<stream_ct; i++){
471
                get_le16(pb);
472
                ext_len = get_le16(pb);
473
                url_fseek(pb, ext_len, SEEK_CUR);
474
            }
475

    
476
            for (i=0; i<payload_ext_ct; i++){
477
                get_guid(pb, &g);
478
                ext_d=get_le16(pb);
479
                ext_len=get_le32(pb);
480
                url_fseek(pb, ext_len, SEEK_CUR);
481
            }
482

    
483
            // there could be a optional stream properties object to follow
484
            // if so the next iteration will pick it up
485
        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
486
            int v1, v2;
487
            get_guid(pb, &g);
488
            v1 = get_le32(pb);
489
            v2 = get_le16(pb);
490
#if 0
491
        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
492
            int len, v1, n, num;
493
            char str[256], *q;
494
            char tag[16];
495

496
            get_guid(pb, &g);
497
            print_guid(&g);
498

499
            n = get_le32(pb);
500
            for(i=0;i<n;i++) {
501
                num = get_le16(pb); /* stream number */
502
                get_str16(pb, str, sizeof(str));
503
                get_str16(pb, str, sizeof(str));
504
                len = get_le16(pb);
505
                q = tag;
506
                while (len > 0) {
507
                    v1 = get_byte(pb);
508
                    if ((q - tag) < sizeof(tag) - 1)
509
                        *q++ = v1;
510
                    len--;
511
                }
512
                *q = '\0';
513
            }
514
#endif
515
        } else if (url_feof(pb)) {
516
            return -1;
517
        } else {
518
            url_fseek(pb, gsize - 24, SEEK_CUR);
519
        }
520
    }
521
    get_guid(pb, &g);
522
    get_le64(pb);
523
    get_byte(pb);
524
    get_byte(pb);
525
    if (url_feof(pb))
526
        return -1;
527
    asf->data_offset = url_ftell(pb);
528
    asf->packet_size_left = 0;
529

    
530

    
531
    for(i=0; i<128; i++){
532
        int stream_num= asf->asfid2avid[i];
533
        if(stream_num>=0){
534
            AVStream *st = s->streams[stream_num];
535
            if (!st->codec->bit_rate)
536
                st->codec->bit_rate = bitrate[i];
537
            if (dar[i].num > 0 && dar[i].den > 0)
538
                av_reduce(&st->sample_aspect_ratio.num,
539
                          &st->sample_aspect_ratio.den,
540
                          dar[i].num, dar[i].den, INT_MAX);
541
//av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
542
        }
543
    }
544

    
545
    return 0;
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
    dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
629
    return 0;
630
}
631

    
632
/**
633
 *
634
 * @return <0 if error
635
 */
636
static int asf_read_frame_header(AVFormatContext *s){
637
    ASFContext *asf = s->priv_data;
638
    ByteIOContext *pb = s->pb;
639
    int rsize = 1;
640
    int num = get_byte(pb);
641
    int64_t ts0, ts1;
642

    
643
    asf->packet_segments--;
644
    asf->packet_key_frame = num >> 7;
645
    asf->stream_index = asf->asfid2avid[num & 0x7f];
646
    // sequence should be ignored!
647
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
648
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
649
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
650
//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);
651
    if (asf->packet_replic_size >= 8) {
652
        asf->packet_obj_size = get_le32(pb);
653
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
654
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
655
            return -1;
656
        }
657
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
658
        if(asf->packet_replic_size >= 8+38+4){
659
//            for(i=0; i<asf->packet_replic_size-8; i++)
660
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
661
//            av_log(s, AV_LOG_DEBUG, "\n");
662
            url_fskip(pb, 10);
663
            ts0= get_le64(pb);
664
            ts1= get_le64(pb);
665
            url_fskip(pb, 12);
666
            get_le32(pb);
667
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
668
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
669
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
670
        }else
671
            url_fskip(pb, asf->packet_replic_size - 8);
672
        rsize += asf->packet_replic_size; // FIXME - check validity
673
    } else if (asf->packet_replic_size==1){
674
        // multipacket - frag_offset is beginning timestamp
675
        asf->packet_time_start = asf->packet_frag_offset;
676
        asf->packet_frag_offset = 0;
677
        asf->packet_frag_timestamp = asf->packet_timestamp;
678

    
679
        asf->packet_time_delta = get_byte(pb);
680
        rsize++;
681
    }else if(asf->packet_replic_size!=0){
682
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
683
        return -1;
684
    }
685
    if (asf->packet_flags & 0x01) {
686
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
687
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
688
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
689
            return -1;
690
        }
691
        //printf("Fragsize %d\n", asf->packet_frag_size);
692
    } else {
693
        asf->packet_frag_size = asf->packet_size_left - rsize;
694
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
695
    }
696
    if (asf->packet_replic_size == 1) {
697
        asf->packet_multi_size = asf->packet_frag_size;
698
        if (asf->packet_multi_size > asf->packet_size_left)
699
            return -1;
700
    }
701
    asf->packet_size_left -= rsize;
702
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
703

    
704
    return 0;
705
}
706

    
707
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
708
{
709
    ASFContext *asf = s->priv_data;
710
    ASFStream *asf_st = 0;
711
    ByteIOContext *pb = s->pb;
712
    //static int pc = 0;
713
    for (;;) {
714
        if(url_feof(pb))
715
            return AVERROR(EIO);
716
        if (asf->packet_size_left < FRAME_HEADER_SIZE
717
            || asf->packet_segments < 1) {
718
            //asf->packet_size_left <= asf->packet_padsize) {
719
            int ret = asf->packet_size_left + asf->packet_padsize;
720
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
721
            assert(ret>=0);
722
            /* fail safe */
723
            url_fskip(pb, ret);
724

    
725
            asf->packet_pos= url_ftell(s->pb);
726
            if (asf->data_object_size != (uint64_t)-1 &&
727
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
728
                return AVERROR(EIO); /* Do not exceed the size of the data object */
729
            ret = asf_get_packet(s);
730
            //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
731
            if (ret < 0)
732
                assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
733
            asf->packet_time_start = 0;
734
            continue;
735
        }
736
        if (asf->packet_time_start == 0) {
737
            if(asf_read_frame_header(s) < 0){
738
                asf->packet_segments= 0;
739
                continue;
740
            }
741
            if (asf->stream_index < 0
742
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
743
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
744
                ) {
745
                asf->packet_time_start = 0;
746
                /* unhandled packet (should not happen) */
747
                url_fskip(pb, asf->packet_frag_size);
748
                asf->packet_size_left -= asf->packet_frag_size;
749
                if(asf->stream_index < 0)
750
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
751
                continue;
752
            }
753
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
754
        }
755
        asf_st = asf->asf_st;
756

    
757
        if (asf->packet_replic_size == 1) {
758
            // frag_offset is here used as the beginning timestamp
759
            asf->packet_frag_timestamp = asf->packet_time_start;
760
            asf->packet_time_start += asf->packet_time_delta;
761
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
762
            asf->packet_size_left--;
763
            asf->packet_multi_size--;
764
            if (asf->packet_multi_size < asf->packet_obj_size)
765
            {
766
                asf->packet_time_start = 0;
767
                url_fskip(pb, asf->packet_multi_size);
768
                asf->packet_size_left -= asf->packet_multi_size;
769
                continue;
770
            }
771
            asf->packet_multi_size -= asf->packet_obj_size;
772
            //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);
773
        }
774
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
775
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
776
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
777
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
778
                asf_st->frag_offset, asf->packet_frag_size,
779
                asf->packet_obj_size, asf_st->pkt.size);
780
            asf->packet_obj_size= asf_st->pkt.size;
781
        }
782

    
783
        if (   asf_st->pkt.size != asf->packet_obj_size
784
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
785
            if(asf_st->pkt.data){
786
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
787
                asf_st->frag_offset = 0;
788
                av_free_packet(&asf_st->pkt);
789
            }
790
            /* new packet */
791
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
792
            asf_st->seq = asf->packet_seq;
793
            asf_st->pkt.pts = asf->packet_frag_timestamp;
794
            asf_st->pkt.stream_index = asf->stream_index;
795
            asf_st->pkt.pos =
796
            asf_st->packet_pos= asf->packet_pos;
797
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
798
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
799
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
800
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
801
                asf->packet_key_frame = 1;
802
            if (asf->packet_key_frame)
803
                asf_st->pkt.flags |= PKT_FLAG_KEY;
804
        }
805

    
806
        /* read data */
807
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
808
        //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
809
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
810
        asf->packet_size_left -= asf->packet_frag_size;
811
        if (asf->packet_size_left < 0)
812
            continue;
813

    
814
        if(   asf->packet_frag_offset >= asf_st->pkt.size
815
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
816
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
817
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
818
            continue;
819
        }
820

    
821
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
822
                   asf->packet_frag_size);
823
        if (s->key && s->keylen == 20)
824
            ff_asfcrypt_dec(s->key, 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
// Added to support seeking after packets have been read
882
// If information is not reset, read_packet fails due to
883
// leftover information from previous reads
884
static void asf_reset_header(AVFormatContext *s)
885
{
886
    ASFContext *asf = s->priv_data;
887
    ASFStream *asf_st;
888
    int i;
889

    
890
    asf->packet_nb_frames = 0;
891
    asf->packet_size_left = 0;
892
    asf->packet_segments = 0;
893
    asf->packet_flags = 0;
894
    asf->packet_property = 0;
895
    asf->packet_timestamp = 0;
896
    asf->packet_segsizetype = 0;
897
    asf->packet_segments = 0;
898
    asf->packet_seq = 0;
899
    asf->packet_replic_size = 0;
900
    asf->packet_key_frame = 0;
901
    asf->packet_padsize = 0;
902
    asf->packet_frag_offset = 0;
903
    asf->packet_frag_size = 0;
904
    asf->packet_frag_timestamp = 0;
905
    asf->packet_multi_size = 0;
906
    asf->packet_obj_size = 0;
907
    asf->packet_time_delta = 0;
908
    asf->packet_time_start = 0;
909

    
910
    for(i=0; i<s->nb_streams; i++){
911
        asf_st= s->streams[i]->priv_data;
912
        av_free_packet(&asf_st->pkt);
913
        asf_st->frag_offset=0;
914
        asf_st->seq=0;
915
    }
916
    asf->asf_st= NULL;
917
}
918

    
919
static int asf_read_close(AVFormatContext *s)
920
{
921
    int i;
922

    
923
    asf_reset_header(s);
924
    for(i=0;i<s->nb_streams;i++) {
925
        AVStream *st = s->streams[i];
926
        av_free(st->codec->palctrl);
927
    }
928
    return 0;
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
    /* Try using the protocol's read_seek if available */
1029
    if(s->pb) {
1030
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1031
        if(ret >= 0)
1032
            asf_reset_header(s);
1033
        if (ret != AVERROR(ENOSYS))
1034
            return ret;
1035
    }
1036

    
1037
    if (!asf->index_read)
1038
        asf_build_simple_index(s, stream_index);
1039

    
1040
    if(!(asf->index_read && st->index_entries)){
1041
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1042
            return -1;
1043
    }else{
1044
        index= av_index_search_timestamp(st, pts, flags);
1045
        if(index<0)
1046
            return -1;
1047

    
1048
        /* find the position */
1049
        pos = st->index_entries[index].pos;
1050
        pts = st->index_entries[index].timestamp;
1051

    
1052
    // various attempts to find key frame have failed so far
1053
    //    asf_reset_header(s);
1054
    //    url_fseek(s->pb, pos, SEEK_SET);
1055
    //    key_pos = pos;
1056
    //     for(i=0;i<16;i++){
1057
    //         pos = url_ftell(s->pb);
1058
    //         if (av_read_frame(s, &pkt) < 0){
1059
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1060
    //             return -1;
1061
    //         }
1062
    //         asf_st = s->streams[stream_index]->priv_data;
1063
    //         pos += st->parser->frame_offset;
1064
    //
1065
    //         if (pkt.size > b) {
1066
    //             b = pkt.size;
1067
    //             key_pos = pos;
1068
    //         }
1069
    //
1070
    //         av_free_packet(&pkt);
1071
    //     }
1072

    
1073
        /* do the seek */
1074
        av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1075
        url_fseek(s->pb, pos, SEEK_SET);
1076
    }
1077
    asf_reset_header(s);
1078
    return 0;
1079
}
1080

    
1081
AVInputFormat asf_demuxer = {
1082
    "asf",
1083
    NULL_IF_CONFIG_SMALL("ASF format"),
1084
    sizeof(ASFContext),
1085
    asf_probe,
1086
    asf_read_header,
1087
    asf_read_packet,
1088
    asf_read_close,
1089
    asf_read_seek,
1090
    asf_read_pts,
1091
};