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ffmpeg / libavformat / asfdec.c @ d42b0972

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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
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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
//#define DEBUG
23

    
24
#include "libavutil/common.h"
25
#include "libavutil/avstring.h"
26
#include "libavcodec/mpegaudio.h"
27
#include "avformat.h"
28
#include "riff.h"
29
#include "asf.h"
30
#include "asfcrypt.h"
31
#include "avlanguage.h"
32

    
33
void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
34

    
35
typedef struct {
36
    int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID
37
    ASFStream streams[128];              ///< it's max number and it's not that big
38
    uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)
39
    AVRational dar[128];
40
    char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)
41
    /* non streamed additonnal info */
42
    /* packet filling */
43
    int packet_size_left;
44
    /* only for reading */
45
    uint64_t data_offset;                ///< beginning of the first data packet
46
    uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)
47
    uint64_t data_object_size;           ///< size of the data object
48
    int index_read;
49

    
50
    ASFMainHeader hdr;
51

    
52
    int packet_flags;
53
    int packet_property;
54
    int packet_timestamp;
55
    int packet_segsizetype;
56
    int packet_segments;
57
    int packet_seq;
58
    int packet_replic_size;
59
    int packet_key_frame;
60
    int packet_padsize;
61
    unsigned int packet_frag_offset;
62
    unsigned int packet_frag_size;
63
    int64_t packet_frag_timestamp;
64
    int packet_multi_size;
65
    int packet_obj_size;
66
    int packet_time_delta;
67
    int packet_time_start;
68
    int64_t packet_pos;
69

    
70
    int stream_index;
71

    
72
    ASFStream* asf_st;                   ///< currently decoded stream
73
} ASFContext;
74

    
75
#undef NDEBUG
76
#include <assert.h>
77

    
78
#define ASF_MAX_STREAMS 127
79
#define FRAME_HEADER_SIZE 17
80
// Fix Me! FRAME_HEADER_SIZE may be different.
81

    
82
static const ff_asf_guid index_guid = {
83
    0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
84
};
85

    
86
static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
87
    0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
88
};
89
/**********************************/
90
/* decoding */
91

    
92
#ifdef DEBUG
93
#define PRINT_IF_GUID(g,cmp) \
94
if (!ff_guidcmp(g, &cmp)) \
95
    av_dlog(NULL, "(GUID: %s) ", #cmp)
96

    
97
static void print_guid(const ff_asf_guid *g)
98
{
99
    int i;
100
    PRINT_IF_GUID(g, ff_asf_header);
101
    else PRINT_IF_GUID(g, ff_asf_file_header);
102
    else PRINT_IF_GUID(g, ff_asf_stream_header);
103
    else PRINT_IF_GUID(g, ff_asf_audio_stream);
104
    else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
105
    else PRINT_IF_GUID(g, ff_asf_video_stream);
106
    else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
107
    else PRINT_IF_GUID(g, ff_asf_command_stream);
108
    else PRINT_IF_GUID(g, ff_asf_comment_header);
109
    else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
110
    else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
111
    else PRINT_IF_GUID(g, ff_asf_data_header);
112
    else PRINT_IF_GUID(g, index_guid);
113
    else PRINT_IF_GUID(g, ff_asf_head1_guid);
114
    else PRINT_IF_GUID(g, ff_asf_head2_guid);
115
    else PRINT_IF_GUID(g, ff_asf_my_guid);
116
    else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
117
    else PRINT_IF_GUID(g, ff_asf_extended_content_header);
118
    else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
119
    else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
120
    else PRINT_IF_GUID(g, ff_asf_metadata_header);
121
    else PRINT_IF_GUID(g, ff_asf_marker_header);
122
    else PRINT_IF_GUID(g, stream_bitrate_guid);
123
    else PRINT_IF_GUID(g, ff_asf_language_guid);
124
    else
125
        av_dlog(NULL, "(GUID: unknown) ");
126
    for(i=0;i<16;i++)
127
        av_dlog(NULL, " 0x%02x,", (*g)[i]);
128
    av_dlog(NULL, "}\n");
129
}
130
#undef PRINT_IF_GUID
131
#else
132
#define print_guid(g)
133
#endif
134

    
135
void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
136
{
137
    assert(sizeof(*g) == 16);
138
    get_buffer(s, *g, sizeof(*g));
139
}
140

    
141
static int asf_probe(AVProbeData *pd)
142
{
143
    /* check file header */
144
    if (!ff_guidcmp(pd->buf, &ff_asf_header))
145
        return AVPROBE_SCORE_MAX;
146
    else
147
        return 0;
148
}
149

    
150
static int get_value(ByteIOContext *pb, int type){
151
    switch(type){
152
        case 2: return get_le32(pb);
153
        case 3: return get_le32(pb);
154
        case 4: return get_le64(pb);
155
        case 5: return get_le16(pb);
156
        default:return INT_MIN;
157
    }
158
}
159

    
160
static void get_tag(AVFormatContext *s, const char *key, int type, int len)
161
{
162
    char *value;
163
    int64_t off = url_ftell(s->pb);
164

    
165
    if ((unsigned)len >= (UINT_MAX - 1)/2)
166
        return;
167

    
168
    value = av_malloc(2*len+1);
169
    if (!value)
170
        goto finish;
171

    
172
    if (type == 0) {         // UTF16-LE
173
        avio_get_str16le(s->pb, len, value, 2*len + 1);
174
    } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
175
        uint64_t num = get_value(s->pb, type);
176
        snprintf(value, len, "%"PRIu64, num);
177
    } else {
178
        av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
179
        goto finish;
180
    }
181
    av_metadata_set2(&s->metadata, key, value, 0);
182
finish:
183
    av_freep(&value);
184
    url_fseek(s->pb, off + len, SEEK_SET);
185
}
186

    
187
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
188
{
189
    ASFContext *asf = s->priv_data;
190
    ff_asf_guid g;
191
    ByteIOContext *pb = s->pb;
192
    AVStream *st;
193
    ASFStream *asf_st;
194
    int size, i;
195
    int64_t gsize;
196
    uint32_t bitrate[128];
197

    
198
    memset(bitrate, 0, sizeof(bitrate));
199

    
200
    ff_get_guid(pb, &g);
201
    if (ff_guidcmp(&g, &ff_asf_header))
202
        return -1;
203
    get_le64(pb);
204
    get_le32(pb);
205
    get_byte(pb);
206
    get_byte(pb);
207
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
208
    for(;;) {
209
        uint64_t gpos= url_ftell(pb);
210
        int ret;
211
        ff_get_guid(pb, &g);
212
        gsize = get_le64(pb);
213
        av_dlog(s, "%08"PRIx64": ", gpos);
214
        print_guid(&g);
215
        av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
216
        if (!ff_guidcmp(&g, &ff_asf_data_header)) {
217
            asf->data_object_offset = url_ftell(pb);
218
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
219
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
220
                asf->data_object_size = gsize - 24;
221
            } else {
222
                asf->data_object_size = (uint64_t)-1;
223
            }
224
            break;
225
        }
226
        if (gsize < 24)
227
            return -1;
228
        if (!ff_guidcmp(&g, &ff_asf_file_header)) {
229
            ff_get_guid(pb, &asf->hdr.guid);
230
            asf->hdr.file_size          = get_le64(pb);
231
            asf->hdr.create_time        = get_le64(pb);
232
            get_le64(pb);                               /* number of packets */
233
            asf->hdr.play_time          = get_le64(pb);
234
            asf->hdr.send_time          = get_le64(pb);
235
            asf->hdr.preroll            = get_le32(pb);
236
            asf->hdr.ignore             = get_le32(pb);
237
            asf->hdr.flags              = get_le32(pb);
238
            asf->hdr.min_pktsize        = get_le32(pb);
239
            asf->hdr.max_pktsize        = get_le32(pb);
240
            asf->hdr.max_bitrate        = get_le32(pb);
241
            s->packet_size = asf->hdr.max_pktsize;
242
        } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
243
            enum AVMediaType type;
244
            int type_specific_size, sizeX;
245
            uint64_t total_size;
246
            unsigned int tag1;
247
            int64_t pos1, pos2, start_time;
248
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
249

    
250
            if (s->nb_streams == ASF_MAX_STREAMS) {
251
                av_log(s, AV_LOG_ERROR, "too many streams\n");
252
                return AVERROR(EINVAL);
253
            }
254

    
255
            pos1 = url_ftell(pb);
256

    
257
            st = av_new_stream(s, 0);
258
            if (!st)
259
                return AVERROR(ENOMEM);
260
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
261
            asf_st = av_mallocz(sizeof(ASFStream));
262
            if (!asf_st)
263
                return AVERROR(ENOMEM);
264
            st->priv_data = asf_st;
265
            start_time = asf->hdr.preroll;
266

    
267
            asf_st->stream_language_index = 128; // invalid stream index means no language info
268

    
269
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
270
                st->duration = asf->hdr.play_time /
271
                    (10000000 / 1000) - start_time;
272
            }
273
            ff_get_guid(pb, &g);
274

    
275
            test_for_ext_stream_audio = 0;
276
            if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
277
                type = AVMEDIA_TYPE_AUDIO;
278
            } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
279
                type = AVMEDIA_TYPE_VIDEO;
280
            } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
281
                type = AVMEDIA_TYPE_VIDEO;
282
                st->codec->codec_id = CODEC_ID_MJPEG;
283
            } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
284
                type = AVMEDIA_TYPE_DATA;
285
            } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
286
                test_for_ext_stream_audio = 1;
287
                type = AVMEDIA_TYPE_UNKNOWN;
288
            } else {
289
                return -1;
290
            }
291
            ff_get_guid(pb, &g);
292
            total_size = get_le64(pb);
293
            type_specific_size = get_le32(pb);
294
            get_le32(pb);
295
            st->id = get_le16(pb) & 0x7f; /* stream id */
296
            // mapping of asf ID to AV stream ID;
297
            asf->asfid2avid[st->id] = s->nb_streams - 1;
298

    
299
            get_le32(pb);
300

    
301
            if (test_for_ext_stream_audio) {
302
                ff_get_guid(pb, &g);
303
                if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
304
                    type = AVMEDIA_TYPE_AUDIO;
305
                    is_dvr_ms_audio=1;
306
                    ff_get_guid(pb, &g);
307
                    get_le32(pb);
308
                    get_le32(pb);
309
                    get_le32(pb);
310
                    ff_get_guid(pb, &g);
311
                    get_le32(pb);
312
                }
313
            }
314

    
315
            st->codec->codec_type = type;
316
            if (type == AVMEDIA_TYPE_AUDIO) {
317
                ff_get_wav_header(pb, st->codec, type_specific_size);
318
                if (is_dvr_ms_audio) {
319
                    // codec_id and codec_tag are unreliable in dvr_ms
320
                    // files. Set them later by probing stream.
321
                    st->codec->codec_id = CODEC_ID_PROBE;
322
                    st->codec->codec_tag = 0;
323
                }
324
                if (st->codec->codec_id == CODEC_ID_AAC) {
325
                    st->need_parsing = AVSTREAM_PARSE_NONE;
326
                } else {
327
                    st->need_parsing = AVSTREAM_PARSE_FULL;
328
                }
329
                /* We have to init the frame size at some point .... */
330
                pos2 = url_ftell(pb);
331
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
332
                    asf_st->ds_span = get_byte(pb);
333
                    asf_st->ds_packet_size = get_le16(pb);
334
                    asf_st->ds_chunk_size = get_le16(pb);
335
                    get_le16(pb); //ds_data_size
336
                    get_byte(pb); //ds_silence_data
337
                }
338
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
339
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
340
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
341
                if (asf_st->ds_span > 1) {
342
                    if (!asf_st->ds_chunk_size
343
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
344
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
345
                        asf_st->ds_span = 0; // disable descrambling
346
                }
347
                switch (st->codec->codec_id) {
348
                case CODEC_ID_MP3:
349
                    st->codec->frame_size = MPA_FRAME_SIZE;
350
                    break;
351
                case CODEC_ID_PCM_S16LE:
352
                case CODEC_ID_PCM_S16BE:
353
                case CODEC_ID_PCM_U16LE:
354
                case CODEC_ID_PCM_U16BE:
355
                case CODEC_ID_PCM_S8:
356
                case CODEC_ID_PCM_U8:
357
                case CODEC_ID_PCM_ALAW:
358
                case CODEC_ID_PCM_MULAW:
359
                    st->codec->frame_size = 1;
360
                    break;
361
                default:
362
                    /* This is probably wrong, but it prevents a crash later */
363
                    st->codec->frame_size = 1;
364
                    break;
365
                }
366
            } else if (type == AVMEDIA_TYPE_VIDEO &&
367
                       gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
368
                get_le32(pb);
369
                get_le32(pb);
370
                get_byte(pb);
371
                size = get_le16(pb); /* size */
372
                sizeX= get_le32(pb); /* size */
373
                st->codec->width = get_le32(pb);
374
                st->codec->height = get_le32(pb);
375
                /* not available for asf */
376
                get_le16(pb); /* panes */
377
                st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
378
                tag1 = get_le32(pb);
379
                url_fskip(pb, 20);
380
//                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
381
                size= sizeX;
382
                if (size > 40) {
383
                    st->codec->extradata_size = size - 40;
384
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
385
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
386
                }
387

    
388
                /* Extract palette from extradata if bpp <= 8 */
389
                /* This code assumes that extradata contains only palette */
390
                /* This is true for all paletted codecs implemented in ffmpeg */
391
                if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
392
                    st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
393
#if HAVE_BIGENDIAN
394
                    for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
395
                        st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
396
#else
397
                    memcpy(st->codec->palctrl->palette, st->codec->extradata,
398
                           FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
399
#endif
400
                    st->codec->palctrl->palette_changed = 1;
401
                }
402

    
403
                st->codec->codec_tag = tag1;
404
                st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
405
                if(tag1 == MKTAG('D', 'V', 'R', ' ')){
406
                    st->need_parsing = AVSTREAM_PARSE_FULL;
407
                    // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
408
                    st->codec->width  =
409
                    st->codec->height = 0;
410
                    av_freep(&st->codec->extradata);
411
                    st->codec->extradata_size=0;
412
                }
413
                if(st->codec->codec_id == CODEC_ID_H264)
414
                    st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
415
            }
416
            pos2 = url_ftell(pb);
417
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
418
        } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
419
            int len1, len2, len3, len4, len5;
420

    
421
            len1 = get_le16(pb);
422
            len2 = get_le16(pb);
423
            len3 = get_le16(pb);
424
            len4 = get_le16(pb);
425
            len5 = get_le16(pb);
426
            get_tag(s, "title"    , 0, len1);
427
            get_tag(s, "author"   , 0, len2);
428
            get_tag(s, "copyright", 0, len3);
429
            get_tag(s, "comment"  , 0, len4);
430
            url_fskip(pb, len5);
431
        } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
432
            int stream_count = get_le16(pb);
433
            int j;
434

    
435
//            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
436
//            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
437
            for(j = 0; j < stream_count; j++) {
438
                int flags, bitrate, stream_id;
439

    
440
                flags= get_le16(pb);
441
                bitrate= get_le32(pb);
442
                stream_id= (flags & 0x7f);
443
//                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
444
                asf->stream_bitrates[stream_id]= bitrate;
445
            }
446
        } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
447
            int j;
448
            int stream_count = get_le16(pb);
449
            for(j = 0; j < stream_count; j++) {
450
                char lang[6];
451
                unsigned int lang_len = get_byte(pb);
452
                if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
453
                    url_fskip(pb, lang_len - ret);
454
                if (j < 128)
455
                    av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
456
            }
457
        } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
458
            int desc_count, i;
459

    
460
            desc_count = get_le16(pb);
461
            for(i=0;i<desc_count;i++) {
462
                    int name_len,value_type,value_len;
463
                    char name[1024];
464

    
465
                    name_len = get_le16(pb);
466
                    if (name_len%2)     // must be even, broken lavf versions wrote len-1
467
                        name_len += 1;
468
                    if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
469
                        url_fskip(pb, name_len - ret);
470
                    value_type = get_le16(pb);
471
                    value_len  = get_le16(pb);
472
                    if (!value_type && value_len%2)
473
                        value_len += 1;
474
                    /**
475
                     * My sample has that stream set to 0 maybe that mean the container.
476
                     * Asf stream count start at 1. I am using 0 to the container value since it's unused
477
                     */
478
                    if (!strcmp(name, "AspectRatioX")){
479
                        asf->dar[0].num= get_value(s->pb, value_type);
480
                    } else if(!strcmp(name, "AspectRatioY")){
481
                        asf->dar[0].den= get_value(s->pb, value_type);
482
                    } else
483
                        get_tag(s, name, value_type, value_len);
484
            }
485
        } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
486
            int n, stream_num, name_len, value_len, value_type, value_num;
487
            n = get_le16(pb);
488

    
489
            for(i=0;i<n;i++) {
490
                char name[1024];
491

    
492
                get_le16(pb); //lang_list_index
493
                stream_num= get_le16(pb);
494
                name_len=   get_le16(pb);
495
                value_type= get_le16(pb);
496
                value_len=  get_le32(pb);
497

    
498
                if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
499
                    url_fskip(pb, name_len - ret);
500
//av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
501
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
502
                url_fskip(pb, value_len - 2);
503

    
504
                if(stream_num<128){
505
                    if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
506
                    else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
507
                }
508
            }
509
        } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
510
            int ext_len, payload_ext_ct, stream_ct;
511
            uint32_t ext_d, leak_rate, stream_num;
512
            unsigned int stream_languageid_index;
513

    
514
            get_le64(pb); // starttime
515
            get_le64(pb); // endtime
516
            leak_rate = get_le32(pb); // leak-datarate
517
            get_le32(pb); // bucket-datasize
518
            get_le32(pb); // init-bucket-fullness
519
            get_le32(pb); // alt-leak-datarate
520
            get_le32(pb); // alt-bucket-datasize
521
            get_le32(pb); // alt-init-bucket-fullness
522
            get_le32(pb); // max-object-size
523
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
524
            stream_num = get_le16(pb); // stream-num
525

    
526
            stream_languageid_index = get_le16(pb); // stream-language-id-index
527
            if (stream_num < 128)
528
                asf->streams[stream_num].stream_language_index = stream_languageid_index;
529

    
530
            get_le64(pb); // avg frametime in 100ns units
531
            stream_ct = get_le16(pb); //stream-name-count
532
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
533

    
534
            if (stream_num < 128)
535
                bitrate[stream_num] = leak_rate;
536

    
537
            for (i=0; i<stream_ct; i++){
538
                get_le16(pb);
539
                ext_len = get_le16(pb);
540
                url_fseek(pb, ext_len, SEEK_CUR);
541
            }
542

    
543
            for (i=0; i<payload_ext_ct; i++){
544
                ff_get_guid(pb, &g);
545
                ext_d=get_le16(pb);
546
                ext_len=get_le32(pb);
547
                url_fseek(pb, ext_len, SEEK_CUR);
548
            }
549

    
550
            // there could be a optional stream properties object to follow
551
            // if so the next iteration will pick it up
552
            continue;
553
        } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
554
            int v1, v2;
555
            ff_get_guid(pb, &g);
556
            v1 = get_le32(pb);
557
            v2 = get_le16(pb);
558
            continue;
559
        } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
560
            int i, count, name_len;
561
            char name[1024];
562

    
563
            get_le64(pb);            // reserved 16 bytes
564
            get_le64(pb);            // ...
565
            count = get_le32(pb);    // markers count
566
            get_le16(pb);            // reserved 2 bytes
567
            name_len = get_le16(pb); // name length
568
            for(i=0;i<name_len;i++){
569
                get_byte(pb); // skip the name
570
            }
571

    
572
            for(i=0;i<count;i++){
573
                int64_t pres_time;
574
                int name_len;
575

    
576
                get_le64(pb);             // offset, 8 bytes
577
                pres_time = get_le64(pb); // presentation time
578
                get_le16(pb);             // entry length
579
                get_le32(pb);             // send time
580
                get_le32(pb);             // flags
581
                name_len = get_le32(pb);  // name length
582
                if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
583
                    url_fskip(pb, name_len - ret);
584
                ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
585
            }
586
        } else if (url_feof(pb)) {
587
            return -1;
588
        } else {
589
            if (!s->keylen) {
590
                if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
591
                    av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
592
                } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
593
                    av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
594
                } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
595
                    av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
596
                }
597
            }
598
        }
599
        if(url_ftell(pb) != gpos + gsize)
600
            av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
601
        url_fseek(pb, gpos + gsize, SEEK_SET);
602
    }
603
    ff_get_guid(pb, &g);
604
    get_le64(pb);
605
    get_byte(pb);
606
    get_byte(pb);
607
    if (url_feof(pb))
608
        return -1;
609
    asf->data_offset = url_ftell(pb);
610
    asf->packet_size_left = 0;
611

    
612

    
613
    for(i=0; i<128; i++){
614
        int stream_num= asf->asfid2avid[i];
615
        if(stream_num>=0){
616
            AVStream *st = s->streams[stream_num];
617
            if (!st->codec->bit_rate)
618
                st->codec->bit_rate = bitrate[i];
619
            if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
620
                av_reduce(&st->sample_aspect_ratio.num,
621
                          &st->sample_aspect_ratio.den,
622
                          asf->dar[i].num, asf->dar[i].den, INT_MAX);
623
            } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
624
                av_reduce(&st->sample_aspect_ratio.num,
625
                          &st->sample_aspect_ratio.den,
626
                          asf->dar[0].num, asf->dar[0].den, INT_MAX);
627

    
628
//av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
629

    
630
            // copy and convert language codes to the frontend
631
            if (asf->streams[i].stream_language_index < 128) {
632
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
633
                if (rfc1766 && strlen(rfc1766) > 1) {
634
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
635
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
636
                    if (iso6392)
637
                        av_metadata_set2(&st->metadata, "language", iso6392, 0);
638
                }
639
            }
640
        }
641
    }
642

    
643
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
644

    
645
    return 0;
646
}
647

    
648
#define DO_2BITS(bits, var, defval) \
649
    switch (bits & 3) \
650
    { \
651
    case 3: var = get_le32(pb); rsize += 4; break; \
652
    case 2: var = get_le16(pb); rsize += 2; break; \
653
    case 1: var = get_byte(pb); rsize++; break; \
654
    default: var = defval; break; \
655
    }
656

    
657
/**
658
 * Load a single ASF packet into the demuxer.
659
 * @param s demux context
660
 * @param pb context to read data from
661
 * @return 0 on success, <0 on error
662
 */
663
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
664
{
665
    ASFContext *asf = s->priv_data;
666
    uint32_t packet_length, padsize;
667
    int rsize = 8;
668
    int c, d, e, off;
669

    
670
    // if we do not know packet size, allow skipping up to 32 kB
671
    off= 32768;
672
    if (s->packet_size > 0)
673
        off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
674

    
675
    c=d=e=-1;
676
    while(off-- > 0){
677
        c=d; d=e;
678
        e= get_byte(pb);
679
        if(c == 0x82 && !d && !e)
680
            break;
681
    }
682

    
683
    if (c != 0x82) {
684
        /**
685
         * This code allows handling of -EAGAIN at packet boundaries (i.e.
686
         * if the packet sync code above triggers -EAGAIN). This does not
687
         * imply complete -EAGAIN handling support at random positions in
688
         * the stream.
689
         */
690
        if (url_ferror(pb) == AVERROR(EAGAIN))
691
            return AVERROR(EAGAIN);
692
        if (!url_feof(pb))
693
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
694
    }
695
    if ((c & 0x8f) == 0x82) {
696
        if (d || e) {
697
            if (!url_feof(pb))
698
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
699
            return -1;
700
        }
701
        c= get_byte(pb);
702
        d= get_byte(pb);
703
        rsize+=3;
704
    }else{
705
        url_fseek(pb, -1, SEEK_CUR); //FIXME
706
    }
707

    
708
    asf->packet_flags    = c;
709
    asf->packet_property = d;
710

    
711
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
712
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
713
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
714

    
715
    //the following checks prevent overflows and infinite loops
716
    if(!packet_length || packet_length >= (1U<<29)){
717
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
718
        return -1;
719
    }
720
    if(padsize >= packet_length){
721
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
722
        return -1;
723
    }
724

    
725
    asf->packet_timestamp = get_le32(pb);
726
    get_le16(pb); /* duration */
727
    // rsize has at least 11 bytes which have to be present
728

    
729
    if (asf->packet_flags & 0x01) {
730
        asf->packet_segsizetype = get_byte(pb); rsize++;
731
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
732
    } else {
733
        asf->packet_segments = 1;
734
        asf->packet_segsizetype = 0x80;
735
    }
736
    asf->packet_size_left = packet_length - padsize - rsize;
737
    if (packet_length < asf->hdr.min_pktsize)
738
        padsize += asf->hdr.min_pktsize - packet_length;
739
    asf->packet_padsize = padsize;
740
    av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
741
    return 0;
742
}
743

    
744
/**
745
 *
746
 * @return <0 if error
747
 */
748
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
749
    ASFContext *asf = s->priv_data;
750
    int rsize = 1;
751
    int num = get_byte(pb);
752
    int64_t ts0, ts1;
753

    
754
    asf->packet_segments--;
755
    asf->packet_key_frame = num >> 7;
756
    asf->stream_index = asf->asfid2avid[num & 0x7f];
757
    // sequence should be ignored!
758
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
759
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
760
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
761
//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);
762
    if (asf->packet_replic_size >= 8) {
763
        asf->packet_obj_size = get_le32(pb);
764
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
765
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
766
            return -1;
767
        }
768
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
769
        if(asf->packet_replic_size >= 8+38+4){
770
//            for(i=0; i<asf->packet_replic_size-8; i++)
771
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
772
//            av_log(s, AV_LOG_DEBUG, "\n");
773
            url_fskip(pb, 10);
774
            ts0= get_le64(pb);
775
            ts1= get_le64(pb);
776
            url_fskip(pb, 12);
777
            get_le32(pb);
778
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
779
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
780
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
781
        }else
782
            url_fskip(pb, asf->packet_replic_size - 8);
783
        rsize += asf->packet_replic_size; // FIXME - check validity
784
    } else if (asf->packet_replic_size==1){
785
        // multipacket - frag_offset is beginning timestamp
786
        asf->packet_time_start = asf->packet_frag_offset;
787
        asf->packet_frag_offset = 0;
788
        asf->packet_frag_timestamp = asf->packet_timestamp;
789

    
790
        asf->packet_time_delta = get_byte(pb);
791
        rsize++;
792
    }else if(asf->packet_replic_size!=0){
793
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
794
        return -1;
795
    }
796
    if (asf->packet_flags & 0x01) {
797
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
798
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
799
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
800
            return -1;
801
        }
802
        //printf("Fragsize %d\n", asf->packet_frag_size);
803
    } else {
804
        asf->packet_frag_size = asf->packet_size_left - rsize;
805
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
806
    }
807
    if (asf->packet_replic_size == 1) {
808
        asf->packet_multi_size = asf->packet_frag_size;
809
        if (asf->packet_multi_size > asf->packet_size_left)
810
            return -1;
811
    }
812
    asf->packet_size_left -= rsize;
813
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
814

    
815
    return 0;
816
}
817

    
818
/**
819
 * Parse data from individual ASF packets (which were previously loaded
820
 * with asf_get_packet()).
821
 * @param s demux context
822
 * @param pb context to read data from
823
 * @param pkt pointer to store packet data into
824
 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
825
 *          packets need to be loaded (through asf_get_packet())
826
 */
827
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
828
{
829
    ASFContext *asf = s->priv_data;
830
    ASFStream *asf_st = 0;
831
    for (;;) {
832
        int ret;
833
        if(url_feof(pb))
834
            return AVERROR_EOF;
835
        if (asf->packet_size_left < FRAME_HEADER_SIZE
836
            || asf->packet_segments < 1) {
837
            //asf->packet_size_left <= asf->packet_padsize) {
838
            int ret = asf->packet_size_left + asf->packet_padsize;
839
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
840
            assert(ret>=0);
841
            /* fail safe */
842
            url_fskip(pb, ret);
843

    
844
            asf->packet_pos= url_ftell(pb);
845
            if (asf->data_object_size != (uint64_t)-1 &&
846
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
847
                return AVERROR_EOF; /* Do not exceed the size of the data object */
848
            return 1;
849
        }
850
        if (asf->packet_time_start == 0) {
851
            if(asf_read_frame_header(s, pb) < 0){
852
                asf->packet_segments= 0;
853
                continue;
854
            }
855
            if (asf->stream_index < 0
856
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
857
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
858
                ) {
859
                asf->packet_time_start = 0;
860
                /* unhandled packet (should not happen) */
861
                url_fskip(pb, asf->packet_frag_size);
862
                asf->packet_size_left -= asf->packet_frag_size;
863
                if(asf->stream_index < 0)
864
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
865
                continue;
866
            }
867
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
868
        }
869
        asf_st = asf->asf_st;
870

    
871
        if (asf->packet_replic_size == 1) {
872
            // frag_offset is here used as the beginning timestamp
873
            asf->packet_frag_timestamp = asf->packet_time_start;
874
            asf->packet_time_start += asf->packet_time_delta;
875
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
876
            asf->packet_size_left--;
877
            asf->packet_multi_size--;
878
            if (asf->packet_multi_size < asf->packet_obj_size)
879
            {
880
                asf->packet_time_start = 0;
881
                url_fskip(pb, asf->packet_multi_size);
882
                asf->packet_size_left -= asf->packet_multi_size;
883
                continue;
884
            }
885
            asf->packet_multi_size -= asf->packet_obj_size;
886
            //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);
887
        }
888
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
889
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
890
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
891
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
892
                asf_st->frag_offset, asf->packet_frag_size,
893
                asf->packet_obj_size, asf_st->pkt.size);
894
            asf->packet_obj_size= asf_st->pkt.size;
895
        }
896

    
897
        if (   asf_st->pkt.size != asf->packet_obj_size
898
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
899
            if(asf_st->pkt.data){
900
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
901
                asf_st->frag_offset = 0;
902
                av_free_packet(&asf_st->pkt);
903
            }
904
            /* new packet */
905
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
906
            asf_st->seq = asf->packet_seq;
907
            asf_st->pkt.dts = asf->packet_frag_timestamp;
908
            asf_st->pkt.stream_index = asf->stream_index;
909
            asf_st->pkt.pos =
910
            asf_st->packet_pos= asf->packet_pos;
911
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
912
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
913
//s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
914
            if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
915
                asf->packet_key_frame = 1;
916
            if (asf->packet_key_frame)
917
                asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
918
        }
919

    
920
        /* read data */
921
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
922
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
923
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
924
        asf->packet_size_left -= asf->packet_frag_size;
925
        if (asf->packet_size_left < 0)
926
            continue;
927

    
928
        if(   asf->packet_frag_offset >= asf_st->pkt.size
929
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
930
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
931
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
932
            continue;
933
        }
934

    
935
        ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
936
                         asf->packet_frag_size);
937
        if (ret != asf->packet_frag_size) {
938
            if (ret < 0 || asf->packet_frag_offset + ret == 0)
939
                return ret < 0 ? ret : AVERROR_EOF;
940
            if (asf_st->ds_span > 1) {
941
                // scrambling, we can either drop it completely or fill the remainder
942
                // TODO: should we fill the whole packet instead of just the current
943
                // fragment?
944
                memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
945
                       asf->packet_frag_size - ret);
946
                ret = asf->packet_frag_size;
947
            } else
948
                // no scrambling, so we can return partial packets
949
                av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
950
        }
951
        if (s->key && s->keylen == 20)
952
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
953
                            ret);
954
        asf_st->frag_offset += ret;
955
        /* test if whole packet is read */
956
        if (asf_st->frag_offset == asf_st->pkt.size) {
957
            //workaround for macroshit radio DVR-MS files
958
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
959
               && asf_st->pkt.size > 100){
960
                int i;
961
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
962
                if(i == asf_st->pkt.size){
963
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
964
                    asf_st->frag_offset = 0;
965
                    av_free_packet(&asf_st->pkt);
966
                    continue;
967
                }
968
            }
969

    
970
            /* return packet */
971
            if (asf_st->ds_span > 1) {
972
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
973
                    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);
974
              }else{
975
                /* packet descrambling */
976
                uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
977
                if (newdata) {
978
                    int offset = 0;
979
                    memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
980
                    while (offset < asf_st->pkt.size) {
981
                        int off = offset / asf_st->ds_chunk_size;
982
                        int row = off / asf_st->ds_span;
983
                        int col = off % asf_st->ds_span;
984
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
985
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
986

    
987
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
988
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
989
                        memcpy(newdata + offset,
990
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
991
                               asf_st->ds_chunk_size);
992
                        offset += asf_st->ds_chunk_size;
993
                    }
994
                    av_free(asf_st->pkt.data);
995
                    asf_st->pkt.data = newdata;
996
                }
997
              }
998
            }
999
            asf_st->frag_offset = 0;
1000
            *pkt= asf_st->pkt;
1001
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
1002
            asf_st->pkt.size = 0;
1003
            asf_st->pkt.data = 0;
1004
            break; // packet completed
1005
        }
1006
    }
1007
    return 0;
1008
}
1009

    
1010
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1011
{
1012
    ASFContext *asf = s->priv_data;
1013

    
1014
    for (;;) {
1015
        int ret;
1016

    
1017
        /* parse cached packets, if any */
1018
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1019
            return ret;
1020
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1021
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1022
        asf->packet_time_start = 0;
1023
    }
1024

    
1025
    return 0;
1026
}
1027

    
1028
// Added to support seeking after packets have been read
1029
// If information is not reset, read_packet fails due to
1030
// leftover information from previous reads
1031
static void asf_reset_header(AVFormatContext *s)
1032
{
1033
    ASFContext *asf = s->priv_data;
1034
    ASFStream *asf_st;
1035
    int i;
1036

    
1037
    asf->packet_size_left = 0;
1038
    asf->packet_segments = 0;
1039
    asf->packet_flags = 0;
1040
    asf->packet_property = 0;
1041
    asf->packet_timestamp = 0;
1042
    asf->packet_segsizetype = 0;
1043
    asf->packet_segments = 0;
1044
    asf->packet_seq = 0;
1045
    asf->packet_replic_size = 0;
1046
    asf->packet_key_frame = 0;
1047
    asf->packet_padsize = 0;
1048
    asf->packet_frag_offset = 0;
1049
    asf->packet_frag_size = 0;
1050
    asf->packet_frag_timestamp = 0;
1051
    asf->packet_multi_size = 0;
1052
    asf->packet_obj_size = 0;
1053
    asf->packet_time_delta = 0;
1054
    asf->packet_time_start = 0;
1055

    
1056
    for(i=0; i<s->nb_streams; i++){
1057
        asf_st= s->streams[i]->priv_data;
1058
        av_free_packet(&asf_st->pkt);
1059
        asf_st->frag_offset=0;
1060
        asf_st->seq=0;
1061
    }
1062
    asf->asf_st= NULL;
1063
}
1064

    
1065
static int asf_read_close(AVFormatContext *s)
1066
{
1067
    int i;
1068

    
1069
    asf_reset_header(s);
1070
    for(i=0;i<s->nb_streams;i++) {
1071
        AVStream *st = s->streams[i];
1072
        av_free(st->codec->palctrl);
1073
    }
1074
    return 0;
1075
}
1076

    
1077
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1078
{
1079
    AVPacket pkt1, *pkt = &pkt1;
1080
    ASFStream *asf_st;
1081
    int64_t pts;
1082
    int64_t pos= *ppos;
1083
    int i;
1084
    int64_t start_pos[ASF_MAX_STREAMS];
1085

    
1086
    for(i=0; i<s->nb_streams; i++){
1087
        start_pos[i]= pos;
1088
    }
1089

    
1090
    if (s->packet_size > 0)
1091
        pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1092
    *ppos= pos;
1093
    url_fseek(s->pb, pos, SEEK_SET);
1094

    
1095
//printf("asf_read_pts\n");
1096
    asf_reset_header(s);
1097
    for(;;){
1098
        if (av_read_frame(s, pkt) < 0){
1099
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1100
            return AV_NOPTS_VALUE;
1101
        }
1102

    
1103
        pts= pkt->pts;
1104

    
1105
        av_free_packet(pkt);
1106
        if(pkt->flags&AV_PKT_FLAG_KEY){
1107
            i= pkt->stream_index;
1108

    
1109
            asf_st= s->streams[i]->priv_data;
1110

    
1111
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1112
            pos= asf_st->packet_pos;
1113

    
1114
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1115
            start_pos[i]= asf_st->packet_pos + 1;
1116

    
1117
            if(pkt->stream_index == stream_index)
1118
               break;
1119
        }
1120
    }
1121

    
1122
    *ppos= pos;
1123
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1124

    
1125
    return pts;
1126
}
1127

    
1128
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1129
{
1130
    ff_asf_guid g;
1131
    ASFContext *asf = s->priv_data;
1132
    int64_t current_pos= url_ftell(s->pb);
1133
    int i;
1134

    
1135
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1136
    ff_get_guid(s->pb, &g);
1137

    
1138
    /* the data object can be followed by other top-level objects,
1139
       skip them until the simple index object is reached */
1140
    while (ff_guidcmp(&g, &index_guid)) {
1141
        int64_t gsize= get_le64(s->pb);
1142
        if (gsize < 24 || url_feof(s->pb)) {
1143
            url_fseek(s->pb, current_pos, SEEK_SET);
1144
            return;
1145
        }
1146
        url_fseek(s->pb, gsize-24, SEEK_CUR);
1147
        ff_get_guid(s->pb, &g);
1148
    }
1149

    
1150
    {
1151
        int64_t itime, last_pos=-1;
1152
        int pct, ict;
1153
        int64_t av_unused gsize= get_le64(s->pb);
1154
        ff_get_guid(s->pb, &g);
1155
        itime=get_le64(s->pb);
1156
        pct=get_le32(s->pb);
1157
        ict=get_le32(s->pb);
1158
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1159

    
1160
        for (i=0;i<ict;i++){
1161
            int pktnum=get_le32(s->pb);
1162
            int pktct =get_le16(s->pb);
1163
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1164
            int64_t index_pts= av_rescale(itime, i, 10000);
1165

    
1166
            if(pos != last_pos){
1167
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1168
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1169
            last_pos=pos;
1170
            }
1171
        }
1172
        asf->index_read= 1;
1173
    }
1174
    url_fseek(s->pb, current_pos, SEEK_SET);
1175
}
1176

    
1177
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1178
{
1179
    ASFContext *asf = s->priv_data;
1180
    AVStream *st = s->streams[stream_index];
1181
    int64_t pos;
1182
    int index;
1183

    
1184
    if (s->packet_size <= 0)
1185
        return -1;
1186

    
1187
    /* Try using the protocol's read_seek if available */
1188
    if(s->pb) {
1189
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1190
        if(ret >= 0)
1191
            asf_reset_header(s);
1192
        if (ret != AVERROR(ENOSYS))
1193
            return ret;
1194
    }
1195

    
1196
    if (!asf->index_read)
1197
        asf_build_simple_index(s, stream_index);
1198

    
1199
    if(!(asf->index_read && st->index_entries)){
1200
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1201
            return -1;
1202
    }else{
1203
        index= av_index_search_timestamp(st, pts, flags);
1204
        if(index<0)
1205
            return -1;
1206

    
1207
        /* find the position */
1208
        pos = st->index_entries[index].pos;
1209

    
1210
    // various attempts to find key frame have failed so far
1211
    //    asf_reset_header(s);
1212
    //    url_fseek(s->pb, pos, SEEK_SET);
1213
    //    key_pos = pos;
1214
    //     for(i=0;i<16;i++){
1215
    //         pos = url_ftell(s->pb);
1216
    //         if (av_read_frame(s, &pkt) < 0){
1217
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1218
    //             return -1;
1219
    //         }
1220
    //         asf_st = s->streams[stream_index]->priv_data;
1221
    //         pos += st->parser->frame_offset;
1222
    //
1223
    //         if (pkt.size > b) {
1224
    //             b = pkt.size;
1225
    //             key_pos = pos;
1226
    //         }
1227
    //
1228
    //         av_free_packet(&pkt);
1229
    //     }
1230

    
1231
        /* do the seek */
1232
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1233
        url_fseek(s->pb, pos, SEEK_SET);
1234
    }
1235
    asf_reset_header(s);
1236
    return 0;
1237
}
1238

    
1239
AVInputFormat ff_asf_demuxer = {
1240
    "asf",
1241
    NULL_IF_CONFIG_SMALL("ASF format"),
1242
    sizeof(ASFContext),
1243
    asf_probe,
1244
    asf_read_header,
1245
    asf_read_packet,
1246
    asf_read_close,
1247
    asf_read_seek,
1248
    asf_read_pts,
1249
};