bbc2be0ba1642ce13629bc1ecfca95df0df3dfa2
[ffmpeg.git] / libavformat / asfdec.c
1 /*
2  * ASF compatible demuxer
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
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 #undef NDEBUG
36 #include <assert.h>
37
38 #define FRAME_HEADER_SIZE 17
39 // Fix Me! FRAME_HEADER_SIZE may be different.
40
41 static const ff_asf_guid index_guid = {
42     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
43 };
44
45 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
46     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
47 };
48 /**********************************/
49 /* decoding */
50
51 static int guidcmp(const void *g1, const void *g2)
52 {
53     return memcmp(g1, g2, sizeof(ff_asf_guid));
54 }
55
56 #ifdef DEBUG
57 #define PRINT_IF_GUID(g,cmp) \
58 if (!guidcmp(g, &cmp)) \
59     dprintf(NULL, "(GUID: %s) ", #cmp)
60
61 static void print_guid(const ff_asf_guid *g)
62 {
63     int i;
64     PRINT_IF_GUID(g, ff_asf_header);
65     else PRINT_IF_GUID(g, ff_asf_file_header);
66     else PRINT_IF_GUID(g, ff_asf_stream_header);
67     else PRINT_IF_GUID(g, ff_asf_audio_stream);
68     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
69     else PRINT_IF_GUID(g, ff_asf_video_stream);
70     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
71     else PRINT_IF_GUID(g, ff_asf_command_stream);
72     else PRINT_IF_GUID(g, ff_asf_comment_header);
73     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
74     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
75     else PRINT_IF_GUID(g, ff_asf_data_header);
76     else PRINT_IF_GUID(g, index_guid);
77     else PRINT_IF_GUID(g, ff_asf_head1_guid);
78     else PRINT_IF_GUID(g, ff_asf_head2_guid);
79     else PRINT_IF_GUID(g, ff_asf_my_guid);
80     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
81     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
82     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
83     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
84     else PRINT_IF_GUID(g, ff_asf_metadata_header);
85     else PRINT_IF_GUID(g, stream_bitrate_guid);
86     else PRINT_IF_GUID(g, ff_asf_language_guid);
87     else
88         dprintf(NULL, "(GUID: unknown) ");
89     for(i=0;i<16;i++)
90         dprintf(NULL, " 0x%02x,", (*g)[i]);
91     dprintf(NULL, "}\n");
92 }
93 #undef PRINT_IF_GUID
94 #else
95 #define print_guid(g)
96 #endif
97
98 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
99 {
100     assert(sizeof(*g) == 16);
101     get_buffer(s, *g, sizeof(*g));
102 }
103
104 #if 0
105 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
106 {
107     int len, c;
108     char *q;
109
110     len = get_le16(pb);
111     q = buf;
112     while (len > 0) {
113         c = get_le16(pb);
114         if ((q - buf) < buf_size - 1)
115             *q++ = c;
116         len--;
117     }
118     *q = '\0';
119 }
120 #endif
121
122 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
123 {
124     char* q = buf;
125     while (len > 1) {
126         uint8_t tmp;
127         uint32_t ch;
128
129         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
130         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
131     }
132     if (len > 0)
133         url_fskip(pb, len);
134     *q = '\0';
135 }
136
137 static int asf_probe(AVProbeData *pd)
138 {
139     /* check file header */
140     if (!guidcmp(pd->buf, &ff_asf_header))
141         return AVPROBE_SCORE_MAX;
142     else
143         return 0;
144 }
145
146 static int get_value(ByteIOContext *pb, int type){
147     switch(type){
148         case 2: return get_le32(pb);
149         case 3: return get_le32(pb);
150         case 4: return get_le64(pb);
151         case 5: return get_le16(pb);
152         default:return INT_MIN;
153     }
154 }
155
156 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
157 {
158     char *value;
159
160     if ((unsigned)len >= (UINT_MAX - 1)/2)
161         return;
162
163     value = av_malloc(2*len+1);
164     if (!value)
165         return;
166
167     if (type == 0) {         // UTF16-LE
168         get_str16_nolen(s->pb, len, value, 2*len + 1);
169     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
170         uint64_t num = get_value(s->pb, type);
171         snprintf(value, len, "%"PRIu64, num);
172     } else {
173         url_fskip(s->pb, len);
174         av_freep(&value);
175         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
176         return;
177     }
178     if (!strncmp(key, "WM/", 3))
179         key += 3;
180     av_metadata_set2(&s->metadata, key, value, 0);
181     av_freep(&value);
182 }
183
184 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
185 {
186     ASFContext *asf = s->priv_data;
187     ff_asf_guid g;
188     ByteIOContext *pb = s->pb;
189     AVStream *st;
190     ASFStream *asf_st;
191     int size, i;
192     int64_t gsize;
193     AVRational dar[128];
194     uint32_t bitrate[128];
195
196     memset(dar, 0, sizeof(dar));
197     memset(bitrate, 0, sizeof(bitrate));
198
199     get_guid(pb, &g);
200     if (guidcmp(&g, &ff_asf_header))
201         return -1;
202     get_le64(pb);
203     get_le32(pb);
204     get_byte(pb);
205     get_byte(pb);
206     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
207     for(;;) {
208         get_guid(pb, &g);
209         gsize = get_le64(pb);
210         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
211         print_guid(&g);
212         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
213         if (!guidcmp(&g, &ff_asf_data_header)) {
214             asf->data_object_offset = url_ftell(pb);
215             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
216             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
217                 asf->data_object_size = gsize - 24;
218             } else {
219                 asf->data_object_size = (uint64_t)-1;
220             }
221             break;
222         }
223         if (gsize < 24)
224             return -1;
225         if (!guidcmp(&g, &ff_asf_file_header)) {
226             get_guid(pb, &asf->hdr.guid);
227             asf->hdr.file_size          = get_le64(pb);
228             asf->hdr.create_time        = get_le64(pb);
229             asf->nb_packets             = get_le64(pb);
230             asf->hdr.play_time          = get_le64(pb);
231             asf->hdr.send_time          = get_le64(pb);
232             asf->hdr.preroll            = get_le32(pb);
233             asf->hdr.ignore             = get_le32(pb);
234             asf->hdr.flags              = get_le32(pb);
235             asf->hdr.min_pktsize        = get_le32(pb);
236             asf->hdr.max_pktsize        = get_le32(pb);
237             asf->hdr.max_bitrate        = get_le32(pb);
238             s->packet_size = asf->hdr.max_pktsize;
239         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
240             enum CodecType type;
241             int type_specific_size, sizeX;
242             uint64_t total_size;
243             unsigned int tag1;
244             int64_t pos1, pos2, start_time;
245             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
246
247             pos1 = url_ftell(pb);
248
249             st = av_new_stream(s, 0);
250             if (!st)
251                 return AVERROR(ENOMEM);
252             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
253             asf_st = av_mallocz(sizeof(ASFStream));
254             if (!asf_st)
255                 return AVERROR(ENOMEM);
256             st->priv_data = asf_st;
257             start_time = asf->hdr.preroll;
258
259             asf_st->stream_language_index = 128; // invalid stream index means no language info
260
261             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
262                 st->duration = asf->hdr.play_time /
263                     (10000000 / 1000) - start_time;
264             }
265             get_guid(pb, &g);
266
267             test_for_ext_stream_audio = 0;
268             if (!guidcmp(&g, &ff_asf_audio_stream)) {
269                 type = CODEC_TYPE_AUDIO;
270             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
271                 type = CODEC_TYPE_VIDEO;
272             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
273                 type = CODEC_TYPE_DATA;
274             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
275                 test_for_ext_stream_audio = 1;
276                 type = CODEC_TYPE_UNKNOWN;
277             } else {
278                 return -1;
279             }
280             get_guid(pb, &g);
281             total_size = get_le64(pb);
282             type_specific_size = get_le32(pb);
283             get_le32(pb);
284             st->id = get_le16(pb) & 0x7f; /* stream id */
285             // mapping of asf ID to AV stream ID;
286             asf->asfid2avid[st->id] = s->nb_streams - 1;
287
288             get_le32(pb);
289
290             if (test_for_ext_stream_audio) {
291                 get_guid(pb, &g);
292                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
293                     type = CODEC_TYPE_AUDIO;
294                     is_dvr_ms_audio=1;
295                     get_guid(pb, &g);
296                     get_le32(pb);
297                     get_le32(pb);
298                     get_le32(pb);
299                     get_guid(pb, &g);
300                     get_le32(pb);
301                 }
302             }
303
304             st->codec->codec_type = type;
305             if (type == CODEC_TYPE_AUDIO) {
306                 ff_get_wav_header(pb, st->codec, type_specific_size);
307                 if (is_dvr_ms_audio) {
308                     // codec_id and codec_tag are unreliable in dvr_ms
309                     // files. Set them later by probing stream.
310                     st->codec->codec_id = CODEC_ID_PROBE;
311                     st->codec->codec_tag = 0;
312                 }
313                 if (st->codec->codec_id == CODEC_ID_AAC) {
314                     st->need_parsing = AVSTREAM_PARSE_NONE;
315                 } else {
316                     st->need_parsing = AVSTREAM_PARSE_FULL;
317                 }
318                 /* We have to init the frame size at some point .... */
319                 pos2 = url_ftell(pb);
320                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
321                     asf_st->ds_span = get_byte(pb);
322                     asf_st->ds_packet_size = get_le16(pb);
323                     asf_st->ds_chunk_size = get_le16(pb);
324                     get_le16(pb); //ds_data_size
325                     get_byte(pb); //ds_silence_data
326                 }
327                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
328                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
329                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
330                 if (asf_st->ds_span > 1) {
331                     if (!asf_st->ds_chunk_size
332                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
333                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
334                         asf_st->ds_span = 0; // disable descrambling
335                 }
336                 switch (st->codec->codec_id) {
337                 case CODEC_ID_MP3:
338                     st->codec->frame_size = MPA_FRAME_SIZE;
339                     break;
340                 case CODEC_ID_PCM_S16LE:
341                 case CODEC_ID_PCM_S16BE:
342                 case CODEC_ID_PCM_U16LE:
343                 case CODEC_ID_PCM_U16BE:
344                 case CODEC_ID_PCM_S8:
345                 case CODEC_ID_PCM_U8:
346                 case CODEC_ID_PCM_ALAW:
347                 case CODEC_ID_PCM_MULAW:
348                     st->codec->frame_size = 1;
349                     break;
350                 default:
351                     /* This is probably wrong, but it prevents a crash later */
352                     st->codec->frame_size = 1;
353                     break;
354                 }
355             } else if (type == CODEC_TYPE_VIDEO) {
356                 get_le32(pb);
357                 get_le32(pb);
358                 get_byte(pb);
359                 size = get_le16(pb); /* size */
360                 sizeX= get_le32(pb); /* size */
361                 st->codec->width = get_le32(pb);
362                 st->codec->height = get_le32(pb);
363                 /* not available for asf */
364                 get_le16(pb); /* panes */
365                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
366                 tag1 = get_le32(pb);
367                 url_fskip(pb, 20);
368 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
369                 size= sizeX;
370                 if (size > 40) {
371                     st->codec->extradata_size = size - 40;
372                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
373                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
374                 }
375
376                 /* Extract palette from extradata if bpp <= 8 */
377                 /* This code assumes that extradata contains only palette */
378                 /* This is true for all paletted codecs implemented in ffmpeg */
379                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
380                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
381 #if HAVE_BIGENDIAN
382                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
383                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
384 #else
385                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
386                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
387 #endif
388                     st->codec->palctrl->palette_changed = 1;
389                 }
390
391                 st->codec->codec_tag = tag1;
392                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
393                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
394                     st->need_parsing = AVSTREAM_PARSE_FULL;
395             }
396             pos2 = url_ftell(pb);
397             url_fskip(pb, gsize - (pos2 - pos1 + 24));
398         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
399             int len1, len2, len3, len4, len5;
400
401             len1 = get_le16(pb);
402             len2 = get_le16(pb);
403             len3 = get_le16(pb);
404             len4 = get_le16(pb);
405             len5 = get_le16(pb);
406             get_tag(s, "title"    , 0, len1);
407             get_tag(s, "author"   , 0, len2);
408             get_tag(s, "copyright", 0, len3);
409             get_tag(s, "comment"  , 0, len4);
410             url_fskip(pb, len5);
411         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
412             int stream_count = get_le16(pb);
413             int j;
414
415 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
416 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
417             for(j = 0; j < stream_count; j++) {
418                 int flags, bitrate, stream_id;
419
420                 flags= get_le16(pb);
421                 bitrate= get_le32(pb);
422                 stream_id= (flags & 0x7f);
423 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
424                 asf->stream_bitrates[stream_id]= bitrate;
425             }
426         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
427             int j;
428             int stream_count = get_le16(pb);
429             for(j = 0; j < stream_count; j++) {
430                 char lang[6];
431                 unsigned int lang_len = get_byte(pb);
432                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
433                 if (j < 128)
434                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
435             }
436         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
437             int desc_count, i;
438
439             desc_count = get_le16(pb);
440             for(i=0;i<desc_count;i++) {
441                     int name_len,value_type,value_len;
442                     char name[1024];
443
444                     name_len = get_le16(pb);
445                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
446                         name_len += 1;
447                     get_str16_nolen(pb, name_len, name, sizeof(name));
448                     value_type = get_le16(pb);
449                     value_len  = get_le16(pb);
450                     if (!value_type && value_len%2)
451                         value_len += 1;
452                     get_tag(s, name, value_type, value_len);
453             }
454         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
455             int n, stream_num, name_len, value_len, value_type, value_num;
456             n = get_le16(pb);
457
458             for(i=0;i<n;i++) {
459                 char name[1024];
460
461                 get_le16(pb); //lang_list_index
462                 stream_num= get_le16(pb);
463                 name_len=   get_le16(pb);
464                 value_type= get_le16(pb);
465                 value_len=  get_le32(pb);
466
467                 get_str16_nolen(pb, name_len, name, sizeof(name));
468 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
469                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
470                 url_fskip(pb, value_len - 2);
471
472                 if(stream_num<128){
473                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
474                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
475                 }
476             }
477         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
478             int ext_len, payload_ext_ct, stream_ct;
479             uint32_t ext_d, leak_rate, stream_num;
480             unsigned int stream_languageid_index;
481
482             get_le64(pb); // starttime
483             get_le64(pb); // endtime
484             leak_rate = get_le32(pb); // leak-datarate
485             get_le32(pb); // bucket-datasize
486             get_le32(pb); // init-bucket-fullness
487             get_le32(pb); // alt-leak-datarate
488             get_le32(pb); // alt-bucket-datasize
489             get_le32(pb); // alt-init-bucket-fullness
490             get_le32(pb); // max-object-size
491             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
492             stream_num = get_le16(pb); // stream-num
493
494             stream_languageid_index = get_le16(pb); // stream-language-id-index
495             if (stream_num < 128)
496                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
497
498             get_le64(pb); // avg frametime in 100ns units
499             stream_ct = get_le16(pb); //stream-name-count
500             payload_ext_ct = get_le16(pb); //payload-extension-system-count
501
502             if (stream_num < 128)
503                 bitrate[stream_num] = leak_rate;
504
505             for (i=0; i<stream_ct; i++){
506                 get_le16(pb);
507                 ext_len = get_le16(pb);
508                 url_fseek(pb, ext_len, SEEK_CUR);
509             }
510
511             for (i=0; i<payload_ext_ct; i++){
512                 get_guid(pb, &g);
513                 ext_d=get_le16(pb);
514                 ext_len=get_le32(pb);
515                 url_fseek(pb, ext_len, SEEK_CUR);
516             }
517
518             // there could be a optional stream properties object to follow
519             // if so the next iteration will pick it up
520         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
521             int v1, v2;
522             get_guid(pb, &g);
523             v1 = get_le32(pb);
524             v2 = get_le16(pb);
525 #if 0
526         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
527             int len, v1, n, num;
528             char str[256], *q;
529             char tag[16];
530
531             get_guid(pb, &g);
532             print_guid(&g);
533
534             n = get_le32(pb);
535             for(i=0;i<n;i++) {
536                 num = get_le16(pb); /* stream number */
537                 get_str16(pb, str, sizeof(str));
538                 get_str16(pb, str, sizeof(str));
539                 len = get_le16(pb);
540                 q = tag;
541                 while (len > 0) {
542                     v1 = get_byte(pb);
543                     if ((q - tag) < sizeof(tag) - 1)
544                         *q++ = v1;
545                     len--;
546                 }
547                 *q = '\0';
548             }
549 #endif
550         } else if (url_feof(pb)) {
551             return -1;
552         } else {
553             if (!s->keylen) {
554                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
555                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
556                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
557                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
558                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
559                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
560                 }
561             }
562             url_fseek(pb, gsize - 24, SEEK_CUR);
563         }
564     }
565     get_guid(pb, &g);
566     get_le64(pb);
567     get_byte(pb);
568     get_byte(pb);
569     if (url_feof(pb))
570         return -1;
571     asf->data_offset = url_ftell(pb);
572     asf->packet_size_left = 0;
573
574
575     for(i=0; i<128; i++){
576         int stream_num= asf->asfid2avid[i];
577         if(stream_num>=0){
578             AVStream *st = s->streams[stream_num];
579             if (!st->codec->bit_rate)
580                 st->codec->bit_rate = bitrate[i];
581             if (dar[i].num > 0 && dar[i].den > 0)
582                 av_reduce(&st->sample_aspect_ratio.num,
583                           &st->sample_aspect_ratio.den,
584                           dar[i].num, dar[i].den, INT_MAX);
585 //av_log(s, 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);
586
587             // copy and convert language codes to the frontend
588             if (asf->streams[i].stream_language_index < 128) {
589                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
590                 if (rfc1766 && strlen(rfc1766) > 1) {
591                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
592                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
593                     if (iso6392)
594                         av_metadata_set(&st->metadata, "language", iso6392);
595                 }
596             }
597         }
598     }
599
600     return 0;
601 }
602
603 #define DO_2BITS(bits, var, defval) \
604     switch (bits & 3) \
605     { \
606     case 3: var = get_le32(pb); rsize += 4; break; \
607     case 2: var = get_le16(pb); rsize += 2; break; \
608     case 1: var = get_byte(pb); rsize++; break; \
609     default: var = defval; break; \
610     }
611
612 /**
613  * Load a single ASF packet into the demuxer.
614  * @param s demux context
615  * @param pb context to read data from
616  * @returns 0 on success, <0 on error
617  */
618 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
619 {
620     ASFContext *asf = s->priv_data;
621     uint32_t packet_length, padsize;
622     int rsize = 8;
623     int c, d, e, off;
624
625     // if we do not know packet size, allow skipping up to 32 kB
626     off= 32768;
627     if (s->packet_size > 0)
628         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
629
630     c=d=e=-1;
631     while(off-- > 0){
632         c=d; d=e;
633         e= get_byte(pb);
634         if(c == 0x82 && !d && !e)
635             break;
636     }
637
638     if (c != 0x82) {
639         /**
640          * This code allows handling of -EAGAIN at packet boundaries (i.e.
641          * if the packet sync code above triggers -EAGAIN). This does not
642          * imply complete -EAGAIN handling support at random positions in
643          * the stream.
644          */
645         if (url_ferror(pb) == AVERROR(EAGAIN))
646             return AVERROR(EAGAIN);
647         if (!url_feof(pb))
648             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
649     }
650     if ((c & 0x8f) == 0x82) {
651         if (d || e) {
652             if (!url_feof(pb))
653                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
654             return -1;
655         }
656         c= get_byte(pb);
657         d= get_byte(pb);
658         rsize+=3;
659     }else{
660         url_fseek(pb, -1, SEEK_CUR); //FIXME
661     }
662
663     asf->packet_flags    = c;
664     asf->packet_property = d;
665
666     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
667     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
668     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
669
670     //the following checks prevent overflows and infinite loops
671     if(!packet_length || packet_length >= (1U<<29)){
672         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
673         return -1;
674     }
675     if(padsize >= packet_length){
676         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
677         return -1;
678     }
679
680     asf->packet_timestamp = get_le32(pb);
681     get_le16(pb); /* duration */
682     // rsize has at least 11 bytes which have to be present
683
684     if (asf->packet_flags & 0x01) {
685         asf->packet_segsizetype = get_byte(pb); rsize++;
686         asf->packet_segments = asf->packet_segsizetype & 0x3f;
687     } else {
688         asf->packet_segments = 1;
689         asf->packet_segsizetype = 0x80;
690     }
691     asf->packet_size_left = packet_length - padsize - rsize;
692     if (packet_length < asf->hdr.min_pktsize)
693         padsize += asf->hdr.min_pktsize - packet_length;
694     asf->packet_padsize = padsize;
695     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
696     return 0;
697 }
698
699 /**
700  *
701  * @return <0 if error
702  */
703 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
704     ASFContext *asf = s->priv_data;
705     int rsize = 1;
706     int num = get_byte(pb);
707     int64_t ts0, ts1;
708
709     asf->packet_segments--;
710     asf->packet_key_frame = num >> 7;
711     asf->stream_index = asf->asfid2avid[num & 0x7f];
712     // sequence should be ignored!
713     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
714     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
715     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
716 //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);
717     if (asf->packet_replic_size >= 8) {
718         asf->packet_obj_size = get_le32(pb);
719         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
720             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
721             return -1;
722         }
723         asf->packet_frag_timestamp = get_le32(pb); // timestamp
724         if(asf->packet_replic_size >= 8+38+4){
725 //            for(i=0; i<asf->packet_replic_size-8; i++)
726 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
727 //            av_log(s, AV_LOG_DEBUG, "\n");
728             url_fskip(pb, 10);
729             ts0= get_le64(pb);
730             ts1= get_le64(pb);
731             url_fskip(pb, 12);
732             get_le32(pb);
733             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
734             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
735             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
736         }else
737             url_fskip(pb, asf->packet_replic_size - 8);
738         rsize += asf->packet_replic_size; // FIXME - check validity
739     } else if (asf->packet_replic_size==1){
740         // multipacket - frag_offset is beginning timestamp
741         asf->packet_time_start = asf->packet_frag_offset;
742         asf->packet_frag_offset = 0;
743         asf->packet_frag_timestamp = asf->packet_timestamp;
744
745         asf->packet_time_delta = get_byte(pb);
746         rsize++;
747     }else if(asf->packet_replic_size!=0){
748         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
749         return -1;
750     }
751     if (asf->packet_flags & 0x01) {
752         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
753         if(asf->packet_frag_size > asf->packet_size_left - rsize){
754             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
755             return -1;
756         }
757         //printf("Fragsize %d\n", asf->packet_frag_size);
758     } else {
759         asf->packet_frag_size = asf->packet_size_left - rsize;
760         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
761     }
762     if (asf->packet_replic_size == 1) {
763         asf->packet_multi_size = asf->packet_frag_size;
764         if (asf->packet_multi_size > asf->packet_size_left)
765             return -1;
766     }
767     asf->packet_size_left -= rsize;
768     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
769
770     return 0;
771 }
772
773 /**
774  * Parse data from individual ASF packets (which were previously loaded
775  * with asf_get_packet()).
776  * @param s demux context
777  * @param pb context to read data from
778  * @param pkt pointer to store packet data into
779  * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
780  *          packets need to be loaded (through asf_get_packet())
781  */
782 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
783 {
784     ASFContext *asf = s->priv_data;
785     ASFStream *asf_st = 0;
786     for (;;) {
787         if(url_feof(pb))
788             return AVERROR_EOF;
789         if (asf->packet_size_left < FRAME_HEADER_SIZE
790             || asf->packet_segments < 1) {
791             //asf->packet_size_left <= asf->packet_padsize) {
792             int ret = asf->packet_size_left + asf->packet_padsize;
793             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
794             assert(ret>=0);
795             /* fail safe */
796             url_fskip(pb, ret);
797
798             asf->packet_pos= url_ftell(pb);
799             if (asf->data_object_size != (uint64_t)-1 &&
800                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
801                 return AVERROR_EOF; /* Do not exceed the size of the data object */
802             return 1;
803         }
804         if (asf->packet_time_start == 0) {
805             if(asf_read_frame_header(s, pb) < 0){
806                 asf->packet_segments= 0;
807                 continue;
808             }
809             if (asf->stream_index < 0
810                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
811                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
812                 ) {
813                 asf->packet_time_start = 0;
814                 /* unhandled packet (should not happen) */
815                 url_fskip(pb, asf->packet_frag_size);
816                 asf->packet_size_left -= asf->packet_frag_size;
817                 if(asf->stream_index < 0)
818                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
819                 continue;
820             }
821             asf->asf_st = s->streams[asf->stream_index]->priv_data;
822         }
823         asf_st = asf->asf_st;
824
825         if (asf->packet_replic_size == 1) {
826             // frag_offset is here used as the beginning timestamp
827             asf->packet_frag_timestamp = asf->packet_time_start;
828             asf->packet_time_start += asf->packet_time_delta;
829             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
830             asf->packet_size_left--;
831             asf->packet_multi_size--;
832             if (asf->packet_multi_size < asf->packet_obj_size)
833             {
834                 asf->packet_time_start = 0;
835                 url_fskip(pb, asf->packet_multi_size);
836                 asf->packet_size_left -= asf->packet_multi_size;
837                 continue;
838             }
839             asf->packet_multi_size -= asf->packet_obj_size;
840             //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);
841         }
842         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
843               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
844            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
845             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
846                 asf_st->frag_offset, asf->packet_frag_size,
847                 asf->packet_obj_size, asf_st->pkt.size);
848             asf->packet_obj_size= asf_st->pkt.size;
849         }
850
851         if (   asf_st->pkt.size != asf->packet_obj_size
852             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
853             if(asf_st->pkt.data){
854                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
855                 asf_st->frag_offset = 0;
856                 av_free_packet(&asf_st->pkt);
857             }
858             /* new packet */
859             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
860             asf_st->seq = asf->packet_seq;
861             asf_st->pkt.dts = asf->packet_frag_timestamp;
862             asf_st->pkt.stream_index = asf->stream_index;
863             asf_st->pkt.pos =
864             asf_st->packet_pos= asf->packet_pos;
865 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
866 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
867 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
868             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
869                 asf->packet_key_frame = 1;
870             if (asf->packet_key_frame)
871                 asf_st->pkt.flags |= PKT_FLAG_KEY;
872         }
873
874         /* read data */
875         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
876         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
877         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
878         asf->packet_size_left -= asf->packet_frag_size;
879         if (asf->packet_size_left < 0)
880             continue;
881
882         if(   asf->packet_frag_offset >= asf_st->pkt.size
883            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
884             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
885                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
886             continue;
887         }
888
889         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
890                    asf->packet_frag_size);
891         if (s->key && s->keylen == 20)
892             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
893                             asf->packet_frag_size);
894         asf_st->frag_offset += asf->packet_frag_size;
895         /* test if whole packet is read */
896         if (asf_st->frag_offset == asf_st->pkt.size) {
897             //workaround for macroshit radio DVR-MS files
898             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
899                && asf_st->pkt.size > 100){
900                 int i;
901                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
902                 if(i == asf_st->pkt.size){
903                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
904                     asf_st->frag_offset = 0;
905                     av_free_packet(&asf_st->pkt);
906                     continue;
907                 }
908             }
909
910             /* return packet */
911             if (asf_st->ds_span > 1) {
912               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
913                     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);
914               }else{
915                 /* packet descrambling */
916                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
917                 if (newdata) {
918                     int offset = 0;
919                     while (offset < asf_st->pkt.size) {
920                         int off = offset / asf_st->ds_chunk_size;
921                         int row = off / asf_st->ds_span;
922                         int col = off % asf_st->ds_span;
923                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
924                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
925
926                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
927                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
928                         memcpy(newdata + offset,
929                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
930                                asf_st->ds_chunk_size);
931                         offset += asf_st->ds_chunk_size;
932                     }
933                     av_free(asf_st->pkt.data);
934                     asf_st->pkt.data = newdata;
935                 }
936               }
937             }
938             asf_st->frag_offset = 0;
939             *pkt= asf_st->pkt;
940             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
941             asf_st->pkt.size = 0;
942             asf_st->pkt.data = 0;
943             break; // packet completed
944         }
945     }
946     return 0;
947 }
948
949 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
950 {
951     ASFContext *asf = s->priv_data;
952
953     for (;;) {
954         int ret;
955
956         /* parse cached packets, if any */
957         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
958             return ret;
959         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
960             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
961         asf->packet_time_start = 0;
962     }
963
964     return 0;
965 }
966
967 // Added to support seeking after packets have been read
968 // If information is not reset, read_packet fails due to
969 // leftover information from previous reads
970 static void asf_reset_header(AVFormatContext *s)
971 {
972     ASFContext *asf = s->priv_data;
973     ASFStream *asf_st;
974     int i;
975
976     asf->packet_nb_frames = 0;
977     asf->packet_size_left = 0;
978     asf->packet_segments = 0;
979     asf->packet_flags = 0;
980     asf->packet_property = 0;
981     asf->packet_timestamp = 0;
982     asf->packet_segsizetype = 0;
983     asf->packet_segments = 0;
984     asf->packet_seq = 0;
985     asf->packet_replic_size = 0;
986     asf->packet_key_frame = 0;
987     asf->packet_padsize = 0;
988     asf->packet_frag_offset = 0;
989     asf->packet_frag_size = 0;
990     asf->packet_frag_timestamp = 0;
991     asf->packet_multi_size = 0;
992     asf->packet_obj_size = 0;
993     asf->packet_time_delta = 0;
994     asf->packet_time_start = 0;
995
996     for(i=0; i<s->nb_streams; i++){
997         asf_st= s->streams[i]->priv_data;
998         av_free_packet(&asf_st->pkt);
999         asf_st->frag_offset=0;
1000         asf_st->seq=0;
1001     }
1002     asf->asf_st= NULL;
1003 }
1004
1005 static int asf_read_close(AVFormatContext *s)
1006 {
1007     int i;
1008
1009     asf_reset_header(s);
1010     for(i=0;i<s->nb_streams;i++) {
1011         AVStream *st = s->streams[i];
1012         av_free(st->codec->palctrl);
1013     }
1014     return 0;
1015 }
1016
1017 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1018 {
1019     AVPacket pkt1, *pkt = &pkt1;
1020     ASFStream *asf_st;
1021     int64_t pts;
1022     int64_t pos= *ppos;
1023     int i;
1024     int64_t start_pos[s->nb_streams];
1025
1026     for(i=0; i<s->nb_streams; i++){
1027         start_pos[i]= pos;
1028     }
1029
1030     if (s->packet_size > 0)
1031         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1032     *ppos= pos;
1033     url_fseek(s->pb, pos, SEEK_SET);
1034
1035 //printf("asf_read_pts\n");
1036     asf_reset_header(s);
1037     for(;;){
1038         if (av_read_frame(s, pkt) < 0){
1039             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1040             return AV_NOPTS_VALUE;
1041         }
1042
1043         pts= pkt->pts;
1044
1045         av_free_packet(pkt);
1046         if(pkt->flags&PKT_FLAG_KEY){
1047             i= pkt->stream_index;
1048
1049             asf_st= s->streams[i]->priv_data;
1050
1051 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1052             pos= asf_st->packet_pos;
1053
1054             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1055             start_pos[i]= asf_st->packet_pos + 1;
1056
1057             if(pkt->stream_index == stream_index)
1058                break;
1059         }
1060     }
1061
1062     *ppos= pos;
1063 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1064
1065     return pts;
1066 }
1067
1068 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1069 {
1070     ff_asf_guid g;
1071     ASFContext *asf = s->priv_data;
1072     int64_t current_pos= url_ftell(s->pb);
1073     int i;
1074
1075     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1076     get_guid(s->pb, &g);
1077     if (!guidcmp(&g, &index_guid)) {
1078         int64_t itime, last_pos=-1;
1079         int pct, ict;
1080         int64_t av_unused gsize= get_le64(s->pb);
1081         get_guid(s->pb, &g);
1082         itime=get_le64(s->pb);
1083         pct=get_le32(s->pb);
1084         ict=get_le32(s->pb);
1085         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1086
1087         for (i=0;i<ict;i++){
1088             int pktnum=get_le32(s->pb);
1089             int pktct =get_le16(s->pb);
1090             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1091             int64_t index_pts= av_rescale(itime, i, 10000);
1092
1093             if(pos != last_pos){
1094             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1095             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1096             last_pos=pos;
1097             }
1098         }
1099         asf->index_read= 1;
1100     }
1101     url_fseek(s->pb, current_pos, SEEK_SET);
1102 }
1103
1104 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1105 {
1106     ASFContext *asf = s->priv_data;
1107     AVStream *st = s->streams[stream_index];
1108     int64_t pos;
1109     int index;
1110
1111     if (s->packet_size <= 0)
1112         return -1;
1113
1114     /* Try using the protocol's read_seek if available */
1115     if(s->pb) {
1116         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1117         if(ret >= 0)
1118             asf_reset_header(s);
1119         if (ret != AVERROR(ENOSYS))
1120             return ret;
1121     }
1122
1123     if (!asf->index_read)
1124         asf_build_simple_index(s, stream_index);
1125
1126     if(!(asf->index_read && st->index_entries)){
1127         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1128             return -1;
1129     }else{
1130         index= av_index_search_timestamp(st, pts, flags);
1131         if(index<0)
1132             return -1;
1133
1134         /* find the position */
1135         pos = st->index_entries[index].pos;
1136
1137     // various attempts to find key frame have failed so far
1138     //    asf_reset_header(s);
1139     //    url_fseek(s->pb, pos, SEEK_SET);
1140     //    key_pos = pos;
1141     //     for(i=0;i<16;i++){
1142     //         pos = url_ftell(s->pb);
1143     //         if (av_read_frame(s, &pkt) < 0){
1144     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1145     //             return -1;
1146     //         }
1147     //         asf_st = s->streams[stream_index]->priv_data;
1148     //         pos += st->parser->frame_offset;
1149     //
1150     //         if (pkt.size > b) {
1151     //             b = pkt.size;
1152     //             key_pos = pos;
1153     //         }
1154     //
1155     //         av_free_packet(&pkt);
1156     //     }
1157
1158         /* do the seek */
1159         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1160         url_fseek(s->pb, pos, SEEK_SET);
1161     }
1162     asf_reset_header(s);
1163     return 0;
1164 }
1165
1166 AVInputFormat asf_demuxer = {
1167     "asf",
1168     NULL_IF_CONFIG_SMALL("ASF format"),
1169     sizeof(ASFContext),
1170     asf_probe,
1171     asf_read_header,
1172     asf_read_packet,
1173     asf_read_close,
1174     asf_read_seek,
1175     asf_read_pts,
1176     .metadata_conv = ff_asf_metadata_conv,
1177 };