Use ASF supports "markers" which are a name and a time stamp to create
[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, ff_asf_marker_header);
86     else PRINT_IF_GUID(g, stream_bitrate_guid);
87     else PRINT_IF_GUID(g, ff_asf_language_guid);
88     else
89         dprintf(NULL, "(GUID: unknown) ");
90     for(i=0;i<16;i++)
91         dprintf(NULL, " 0x%02x,", (*g)[i]);
92     dprintf(NULL, "}\n");
93 }
94 #undef PRINT_IF_GUID
95 #else
96 #define print_guid(g)
97 #endif
98
99 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
100 {
101     assert(sizeof(*g) == 16);
102     get_buffer(s, *g, sizeof(*g));
103 }
104
105 #if 0
106 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
107 {
108     int len, c;
109     char *q;
110
111     len = get_le16(pb);
112     q = buf;
113     while (len > 0) {
114         c = get_le16(pb);
115         if ((q - buf) < buf_size - 1)
116             *q++ = c;
117         len--;
118     }
119     *q = '\0';
120 }
121 #endif
122
123 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
124 {
125     char* q = buf;
126     while (len > 1) {
127         uint8_t tmp;
128         uint32_t ch;
129
130         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
131         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
132     }
133     if (len > 0)
134         url_fskip(pb, len);
135     *q = '\0';
136 }
137
138 static int asf_probe(AVProbeData *pd)
139 {
140     /* check file header */
141     if (!guidcmp(pd->buf, &ff_asf_header))
142         return AVPROBE_SCORE_MAX;
143     else
144         return 0;
145 }
146
147 static int get_value(ByteIOContext *pb, int type){
148     switch(type){
149         case 2: return get_le32(pb);
150         case 3: return get_le32(pb);
151         case 4: return get_le64(pb);
152         case 5: return get_le16(pb);
153         default:return INT_MIN;
154     }
155 }
156
157 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
158 {
159     char *value;
160
161     if ((unsigned)len >= (UINT_MAX - 1)/2)
162         return;
163
164     value = av_malloc(2*len+1);
165     if (!value)
166         return;
167
168     if (type == 0) {         // UTF16-LE
169         get_str16_nolen(s->pb, len, value, 2*len + 1);
170     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
171         uint64_t num = get_value(s->pb, type);
172         snprintf(value, len, "%"PRIu64, num);
173     } else {
174         url_fskip(s->pb, len);
175         av_freep(&value);
176         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
177         return;
178     }
179     av_metadata_set2(&s->metadata, key, value, 0);
180     av_freep(&value);
181 }
182
183 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
184 {
185     ASFContext *asf = s->priv_data;
186     ff_asf_guid g;
187     ByteIOContext *pb = s->pb;
188     AVStream *st;
189     ASFStream *asf_st;
190     int size, i;
191     int64_t gsize;
192     AVRational dar[128];
193     uint32_t bitrate[128];
194
195     memset(dar, 0, sizeof(dar));
196     memset(bitrate, 0, sizeof(bitrate));
197
198     get_guid(pb, &g);
199     if (guidcmp(&g, &ff_asf_header))
200         return -1;
201     get_le64(pb);
202     get_le32(pb);
203     get_byte(pb);
204     get_byte(pb);
205     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
206     for(;;) {
207         get_guid(pb, &g);
208         gsize = get_le64(pb);
209         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
210         print_guid(&g);
211         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
212         if (!guidcmp(&g, &ff_asf_data_header)) {
213             asf->data_object_offset = url_ftell(pb);
214             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
215             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
216                 asf->data_object_size = gsize - 24;
217             } else {
218                 asf->data_object_size = (uint64_t)-1;
219             }
220             break;
221         }
222         if (gsize < 24)
223             return -1;
224         if (!guidcmp(&g, &ff_asf_file_header)) {
225             get_guid(pb, &asf->hdr.guid);
226             asf->hdr.file_size          = get_le64(pb);
227             asf->hdr.create_time        = get_le64(pb);
228             asf->nb_packets             = get_le64(pb);
229             asf->hdr.play_time          = get_le64(pb);
230             asf->hdr.send_time          = get_le64(pb);
231             asf->hdr.preroll            = get_le32(pb);
232             asf->hdr.ignore             = get_le32(pb);
233             asf->hdr.flags              = get_le32(pb);
234             asf->hdr.min_pktsize        = get_le32(pb);
235             asf->hdr.max_pktsize        = get_le32(pb);
236             asf->hdr.max_bitrate        = get_le32(pb);
237             s->packet_size = asf->hdr.max_pktsize;
238         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
239             enum CodecType type;
240             int type_specific_size, sizeX;
241             uint64_t total_size;
242             unsigned int tag1;
243             int64_t pos1, pos2, start_time;
244             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
245
246             pos1 = url_ftell(pb);
247
248             st = av_new_stream(s, 0);
249             if (!st)
250                 return AVERROR(ENOMEM);
251             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
252             asf_st = av_mallocz(sizeof(ASFStream));
253             if (!asf_st)
254                 return AVERROR(ENOMEM);
255             st->priv_data = asf_st;
256             start_time = asf->hdr.preroll;
257
258             asf_st->stream_language_index = 128; // invalid stream index means no language info
259
260             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
261                 st->duration = asf->hdr.play_time /
262                     (10000000 / 1000) - start_time;
263             }
264             get_guid(pb, &g);
265
266             test_for_ext_stream_audio = 0;
267             if (!guidcmp(&g, &ff_asf_audio_stream)) {
268                 type = CODEC_TYPE_AUDIO;
269             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
270                 type = CODEC_TYPE_VIDEO;
271             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
272                 type = CODEC_TYPE_DATA;
273             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
274                 test_for_ext_stream_audio = 1;
275                 type = CODEC_TYPE_UNKNOWN;
276             } else {
277                 return -1;
278             }
279             get_guid(pb, &g);
280             total_size = get_le64(pb);
281             type_specific_size = get_le32(pb);
282             get_le32(pb);
283             st->id = get_le16(pb) & 0x7f; /* stream id */
284             // mapping of asf ID to AV stream ID;
285             asf->asfid2avid[st->id] = s->nb_streams - 1;
286
287             get_le32(pb);
288
289             if (test_for_ext_stream_audio) {
290                 get_guid(pb, &g);
291                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
292                     type = CODEC_TYPE_AUDIO;
293                     is_dvr_ms_audio=1;
294                     get_guid(pb, &g);
295                     get_le32(pb);
296                     get_le32(pb);
297                     get_le32(pb);
298                     get_guid(pb, &g);
299                     get_le32(pb);
300                 }
301             }
302
303             st->codec->codec_type = type;
304             if (type == CODEC_TYPE_AUDIO) {
305                 ff_get_wav_header(pb, st->codec, type_specific_size);
306                 if (is_dvr_ms_audio) {
307                     // codec_id and codec_tag are unreliable in dvr_ms
308                     // files. Set them later by probing stream.
309                     st->codec->codec_id = CODEC_ID_PROBE;
310                     st->codec->codec_tag = 0;
311                 }
312                 if (st->codec->codec_id == CODEC_ID_AAC) {
313                     st->need_parsing = AVSTREAM_PARSE_NONE;
314                 } else {
315                     st->need_parsing = AVSTREAM_PARSE_FULL;
316                 }
317                 /* We have to init the frame size at some point .... */
318                 pos2 = url_ftell(pb);
319                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
320                     asf_st->ds_span = get_byte(pb);
321                     asf_st->ds_packet_size = get_le16(pb);
322                     asf_st->ds_chunk_size = get_le16(pb);
323                     get_le16(pb); //ds_data_size
324                     get_byte(pb); //ds_silence_data
325                 }
326                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
327                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
328                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
329                 if (asf_st->ds_span > 1) {
330                     if (!asf_st->ds_chunk_size
331                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
332                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
333                         asf_st->ds_span = 0; // disable descrambling
334                 }
335                 switch (st->codec->codec_id) {
336                 case CODEC_ID_MP3:
337                     st->codec->frame_size = MPA_FRAME_SIZE;
338                     break;
339                 case CODEC_ID_PCM_S16LE:
340                 case CODEC_ID_PCM_S16BE:
341                 case CODEC_ID_PCM_U16LE:
342                 case CODEC_ID_PCM_U16BE:
343                 case CODEC_ID_PCM_S8:
344                 case CODEC_ID_PCM_U8:
345                 case CODEC_ID_PCM_ALAW:
346                 case CODEC_ID_PCM_MULAW:
347                     st->codec->frame_size = 1;
348                     break;
349                 default:
350                     /* This is probably wrong, but it prevents a crash later */
351                     st->codec->frame_size = 1;
352                     break;
353                 }
354             } else if (type == CODEC_TYPE_VIDEO) {
355                 get_le32(pb);
356                 get_le32(pb);
357                 get_byte(pb);
358                 size = get_le16(pb); /* size */
359                 sizeX= get_le32(pb); /* size */
360                 st->codec->width = get_le32(pb);
361                 st->codec->height = get_le32(pb);
362                 /* not available for asf */
363                 get_le16(pb); /* panes */
364                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
365                 tag1 = get_le32(pb);
366                 url_fskip(pb, 20);
367 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
368                 size= sizeX;
369                 if (size > 40) {
370                     st->codec->extradata_size = size - 40;
371                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
372                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
373                 }
374
375                 /* Extract palette from extradata if bpp <= 8 */
376                 /* This code assumes that extradata contains only palette */
377                 /* This is true for all paletted codecs implemented in ffmpeg */
378                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
379                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
380 #if HAVE_BIGENDIAN
381                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
382                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
383 #else
384                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
385                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
386 #endif
387                     st->codec->palctrl->palette_changed = 1;
388                 }
389
390                 st->codec->codec_tag = tag1;
391                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
392                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
393                     st->need_parsing = AVSTREAM_PARSE_FULL;
394             }
395             pos2 = url_ftell(pb);
396             url_fskip(pb, gsize - (pos2 - pos1 + 24));
397         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
398             int len1, len2, len3, len4, len5;
399
400             len1 = get_le16(pb);
401             len2 = get_le16(pb);
402             len3 = get_le16(pb);
403             len4 = get_le16(pb);
404             len5 = get_le16(pb);
405             get_tag(s, "title"    , 0, len1);
406             get_tag(s, "author"   , 0, len2);
407             get_tag(s, "copyright", 0, len3);
408             get_tag(s, "comment"  , 0, len4);
409             url_fskip(pb, len5);
410         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
411             int stream_count = get_le16(pb);
412             int j;
413
414 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
415 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
416             for(j = 0; j < stream_count; j++) {
417                 int flags, bitrate, stream_id;
418
419                 flags= get_le16(pb);
420                 bitrate= get_le32(pb);
421                 stream_id= (flags & 0x7f);
422 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
423                 asf->stream_bitrates[stream_id]= bitrate;
424             }
425         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
426             int j;
427             int stream_count = get_le16(pb);
428             for(j = 0; j < stream_count; j++) {
429                 char lang[6];
430                 unsigned int lang_len = get_byte(pb);
431                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
432                 if (j < 128)
433                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
434             }
435         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
436             int desc_count, i;
437
438             desc_count = get_le16(pb);
439             for(i=0;i<desc_count;i++) {
440                     int name_len,value_type,value_len;
441                     char name[1024];
442
443                     name_len = get_le16(pb);
444                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
445                         name_len += 1;
446                     get_str16_nolen(pb, name_len, name, sizeof(name));
447                     value_type = get_le16(pb);
448                     value_len  = get_le16(pb);
449                     if (!value_type && value_len%2)
450                         value_len += 1;
451                     get_tag(s, name, value_type, value_len);
452             }
453         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
454             int n, stream_num, name_len, value_len, value_type, value_num;
455             n = get_le16(pb);
456
457             for(i=0;i<n;i++) {
458                 char name[1024];
459
460                 get_le16(pb); //lang_list_index
461                 stream_num= get_le16(pb);
462                 name_len=   get_le16(pb);
463                 value_type= get_le16(pb);
464                 value_len=  get_le32(pb);
465
466                 get_str16_nolen(pb, name_len, name, sizeof(name));
467 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
468                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
469                 url_fskip(pb, value_len - 2);
470
471                 if(stream_num<128){
472                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
473                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
474                 }
475             }
476         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
477             int ext_len, payload_ext_ct, stream_ct;
478             uint32_t ext_d, leak_rate, stream_num;
479             unsigned int stream_languageid_index;
480
481             get_le64(pb); // starttime
482             get_le64(pb); // endtime
483             leak_rate = get_le32(pb); // leak-datarate
484             get_le32(pb); // bucket-datasize
485             get_le32(pb); // init-bucket-fullness
486             get_le32(pb); // alt-leak-datarate
487             get_le32(pb); // alt-bucket-datasize
488             get_le32(pb); // alt-init-bucket-fullness
489             get_le32(pb); // max-object-size
490             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
491             stream_num = get_le16(pb); // stream-num
492
493             stream_languageid_index = get_le16(pb); // stream-language-id-index
494             if (stream_num < 128)
495                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
496
497             get_le64(pb); // avg frametime in 100ns units
498             stream_ct = get_le16(pb); //stream-name-count
499             payload_ext_ct = get_le16(pb); //payload-extension-system-count
500
501             if (stream_num < 128)
502                 bitrate[stream_num] = leak_rate;
503
504             for (i=0; i<stream_ct; i++){
505                 get_le16(pb);
506                 ext_len = get_le16(pb);
507                 url_fseek(pb, ext_len, SEEK_CUR);
508             }
509
510             for (i=0; i<payload_ext_ct; i++){
511                 get_guid(pb, &g);
512                 ext_d=get_le16(pb);
513                 ext_len=get_le32(pb);
514                 url_fseek(pb, ext_len, SEEK_CUR);
515             }
516
517             // there could be a optional stream properties object to follow
518             // if so the next iteration will pick it up
519         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
520             int v1, v2;
521             get_guid(pb, &g);
522             v1 = get_le32(pb);
523             v2 = get_le16(pb);
524         } else if (!guidcmp(&g, &ff_asf_marker_header)) {
525             int i, count, name_len;
526             char name[1024];
527
528             get_le64(pb);            // reserved 16 bytes
529             get_le64(pb);            // ...
530             count = get_le32(pb);    // markers count
531             get_le16(pb);            // reserved 2 bytes
532             name_len = get_le16(pb); // name length
533             for(i=0;i<name_len;i++){
534                 get_byte(pb); // skip the name
535             }
536
537             for(i=0;i<count;i++){
538                 int64_t pres_time;
539                 int name_len;
540
541                 get_le64(pb);             // offset, 8 bytes
542                 pres_time = get_le64(pb); // presentation time
543                 get_le16(pb);             // entry length
544                 get_le32(pb);             // send time
545                 get_le32(pb);             // flags
546                 name_len = get_le32(pb);  // name length
547                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
548                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
549             }
550 #if 0
551         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
552             int len, v1, n, num;
553             char str[256], *q;
554             char tag[16];
555
556             get_guid(pb, &g);
557             print_guid(&g);
558
559             n = get_le32(pb);
560             for(i=0;i<n;i++) {
561                 num = get_le16(pb); /* stream number */
562                 get_str16(pb, str, sizeof(str));
563                 get_str16(pb, str, sizeof(str));
564                 len = get_le16(pb);
565                 q = tag;
566                 while (len > 0) {
567                     v1 = get_byte(pb);
568                     if ((q - tag) < sizeof(tag) - 1)
569                         *q++ = v1;
570                     len--;
571                 }
572                 *q = '\0';
573             }
574 #endif
575         } else if (url_feof(pb)) {
576             return -1;
577         } else {
578             if (!s->keylen) {
579                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
580                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
581                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
582                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
583                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
584                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
585                 }
586             }
587             url_fseek(pb, gsize - 24, SEEK_CUR);
588         }
589     }
590     get_guid(pb, &g);
591     get_le64(pb);
592     get_byte(pb);
593     get_byte(pb);
594     if (url_feof(pb))
595         return -1;
596     asf->data_offset = url_ftell(pb);
597     asf->packet_size_left = 0;
598
599
600     for(i=0; i<128; i++){
601         int stream_num= asf->asfid2avid[i];
602         if(stream_num>=0){
603             AVStream *st = s->streams[stream_num];
604             if (!st->codec->bit_rate)
605                 st->codec->bit_rate = bitrate[i];
606             if (dar[i].num > 0 && dar[i].den > 0)
607                 av_reduce(&st->sample_aspect_ratio.num,
608                           &st->sample_aspect_ratio.den,
609                           dar[i].num, dar[i].den, INT_MAX);
610 //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);
611
612             // copy and convert language codes to the frontend
613             if (asf->streams[i].stream_language_index < 128) {
614                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
615                 if (rfc1766 && strlen(rfc1766) > 1) {
616                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
617                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
618                     if (iso6392)
619                         av_metadata_set(&st->metadata, "language", iso6392);
620                 }
621             }
622         }
623     }
624
625     return 0;
626 }
627
628 #define DO_2BITS(bits, var, defval) \
629     switch (bits & 3) \
630     { \
631     case 3: var = get_le32(pb); rsize += 4; break; \
632     case 2: var = get_le16(pb); rsize += 2; break; \
633     case 1: var = get_byte(pb); rsize++; break; \
634     default: var = defval; break; \
635     }
636
637 /**
638  * Load a single ASF packet into the demuxer.
639  * @param s demux context
640  * @param pb context to read data from
641  * @returns 0 on success, <0 on error
642  */
643 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
644 {
645     ASFContext *asf = s->priv_data;
646     uint32_t packet_length, padsize;
647     int rsize = 8;
648     int c, d, e, off;
649
650     // if we do not know packet size, allow skipping up to 32 kB
651     off= 32768;
652     if (s->packet_size > 0)
653         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
654
655     c=d=e=-1;
656     while(off-- > 0){
657         c=d; d=e;
658         e= get_byte(pb);
659         if(c == 0x82 && !d && !e)
660             break;
661     }
662
663     if (c != 0x82) {
664         /**
665          * This code allows handling of -EAGAIN at packet boundaries (i.e.
666          * if the packet sync code above triggers -EAGAIN). This does not
667          * imply complete -EAGAIN handling support at random positions in
668          * the stream.
669          */
670         if (url_ferror(pb) == AVERROR(EAGAIN))
671             return AVERROR(EAGAIN);
672         if (!url_feof(pb))
673             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
674     }
675     if ((c & 0x8f) == 0x82) {
676         if (d || e) {
677             if (!url_feof(pb))
678                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
679             return -1;
680         }
681         c= get_byte(pb);
682         d= get_byte(pb);
683         rsize+=3;
684     }else{
685         url_fseek(pb, -1, SEEK_CUR); //FIXME
686     }
687
688     asf->packet_flags    = c;
689     asf->packet_property = d;
690
691     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
692     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
693     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
694
695     //the following checks prevent overflows and infinite loops
696     if(!packet_length || packet_length >= (1U<<29)){
697         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
698         return -1;
699     }
700     if(padsize >= packet_length){
701         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
702         return -1;
703     }
704
705     asf->packet_timestamp = get_le32(pb);
706     get_le16(pb); /* duration */
707     // rsize has at least 11 bytes which have to be present
708
709     if (asf->packet_flags & 0x01) {
710         asf->packet_segsizetype = get_byte(pb); rsize++;
711         asf->packet_segments = asf->packet_segsizetype & 0x3f;
712     } else {
713         asf->packet_segments = 1;
714         asf->packet_segsizetype = 0x80;
715     }
716     asf->packet_size_left = packet_length - padsize - rsize;
717     if (packet_length < asf->hdr.min_pktsize)
718         padsize += asf->hdr.min_pktsize - packet_length;
719     asf->packet_padsize = padsize;
720     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
721     return 0;
722 }
723
724 /**
725  *
726  * @return <0 if error
727  */
728 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
729     ASFContext *asf = s->priv_data;
730     int rsize = 1;
731     int num = get_byte(pb);
732     int64_t ts0, ts1;
733
734     asf->packet_segments--;
735     asf->packet_key_frame = num >> 7;
736     asf->stream_index = asf->asfid2avid[num & 0x7f];
737     // sequence should be ignored!
738     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
739     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
740     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
741 //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);
742     if (asf->packet_replic_size >= 8) {
743         asf->packet_obj_size = get_le32(pb);
744         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
745             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
746             return -1;
747         }
748         asf->packet_frag_timestamp = get_le32(pb); // timestamp
749         if(asf->packet_replic_size >= 8+38+4){
750 //            for(i=0; i<asf->packet_replic_size-8; i++)
751 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
752 //            av_log(s, AV_LOG_DEBUG, "\n");
753             url_fskip(pb, 10);
754             ts0= get_le64(pb);
755             ts1= get_le64(pb);
756             url_fskip(pb, 12);
757             get_le32(pb);
758             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
759             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
760             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
761         }else
762             url_fskip(pb, asf->packet_replic_size - 8);
763         rsize += asf->packet_replic_size; // FIXME - check validity
764     } else if (asf->packet_replic_size==1){
765         // multipacket - frag_offset is beginning timestamp
766         asf->packet_time_start = asf->packet_frag_offset;
767         asf->packet_frag_offset = 0;
768         asf->packet_frag_timestamp = asf->packet_timestamp;
769
770         asf->packet_time_delta = get_byte(pb);
771         rsize++;
772     }else if(asf->packet_replic_size!=0){
773         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
774         return -1;
775     }
776     if (asf->packet_flags & 0x01) {
777         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
778         if(asf->packet_frag_size > asf->packet_size_left - rsize){
779             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
780             return -1;
781         }
782         //printf("Fragsize %d\n", asf->packet_frag_size);
783     } else {
784         asf->packet_frag_size = asf->packet_size_left - rsize;
785         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
786     }
787     if (asf->packet_replic_size == 1) {
788         asf->packet_multi_size = asf->packet_frag_size;
789         if (asf->packet_multi_size > asf->packet_size_left)
790             return -1;
791     }
792     asf->packet_size_left -= rsize;
793     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
794
795     return 0;
796 }
797
798 /**
799  * Parse data from individual ASF packets (which were previously loaded
800  * with asf_get_packet()).
801  * @param s demux context
802  * @param pb context to read data from
803  * @param pkt pointer to store packet data into
804  * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
805  *          packets need to be loaded (through asf_get_packet())
806  */
807 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
808 {
809     ASFContext *asf = s->priv_data;
810     ASFStream *asf_st = 0;
811     for (;;) {
812         if(url_feof(pb))
813             return AVERROR_EOF;
814         if (asf->packet_size_left < FRAME_HEADER_SIZE
815             || asf->packet_segments < 1) {
816             //asf->packet_size_left <= asf->packet_padsize) {
817             int ret = asf->packet_size_left + asf->packet_padsize;
818             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
819             assert(ret>=0);
820             /* fail safe */
821             url_fskip(pb, ret);
822
823             asf->packet_pos= url_ftell(pb);
824             if (asf->data_object_size != (uint64_t)-1 &&
825                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
826                 return AVERROR_EOF; /* Do not exceed the size of the data object */
827             return 1;
828         }
829         if (asf->packet_time_start == 0) {
830             if(asf_read_frame_header(s, pb) < 0){
831                 asf->packet_segments= 0;
832                 continue;
833             }
834             if (asf->stream_index < 0
835                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
836                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
837                 ) {
838                 asf->packet_time_start = 0;
839                 /* unhandled packet (should not happen) */
840                 url_fskip(pb, asf->packet_frag_size);
841                 asf->packet_size_left -= asf->packet_frag_size;
842                 if(asf->stream_index < 0)
843                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
844                 continue;
845             }
846             asf->asf_st = s->streams[asf->stream_index]->priv_data;
847         }
848         asf_st = asf->asf_st;
849
850         if (asf->packet_replic_size == 1) {
851             // frag_offset is here used as the beginning timestamp
852             asf->packet_frag_timestamp = asf->packet_time_start;
853             asf->packet_time_start += asf->packet_time_delta;
854             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
855             asf->packet_size_left--;
856             asf->packet_multi_size--;
857             if (asf->packet_multi_size < asf->packet_obj_size)
858             {
859                 asf->packet_time_start = 0;
860                 url_fskip(pb, asf->packet_multi_size);
861                 asf->packet_size_left -= asf->packet_multi_size;
862                 continue;
863             }
864             asf->packet_multi_size -= asf->packet_obj_size;
865             //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);
866         }
867         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
868               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
869            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
870             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
871                 asf_st->frag_offset, asf->packet_frag_size,
872                 asf->packet_obj_size, asf_st->pkt.size);
873             asf->packet_obj_size= asf_st->pkt.size;
874         }
875
876         if (   asf_st->pkt.size != asf->packet_obj_size
877             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
878             if(asf_st->pkt.data){
879                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
880                 asf_st->frag_offset = 0;
881                 av_free_packet(&asf_st->pkt);
882             }
883             /* new packet */
884             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
885             asf_st->seq = asf->packet_seq;
886             asf_st->pkt.dts = asf->packet_frag_timestamp;
887             asf_st->pkt.stream_index = asf->stream_index;
888             asf_st->pkt.pos =
889             asf_st->packet_pos= asf->packet_pos;
890 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
891 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
892 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
893             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
894                 asf->packet_key_frame = 1;
895             if (asf->packet_key_frame)
896                 asf_st->pkt.flags |= PKT_FLAG_KEY;
897         }
898
899         /* read data */
900         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
901         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
902         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
903         asf->packet_size_left -= asf->packet_frag_size;
904         if (asf->packet_size_left < 0)
905             continue;
906
907         if(   asf->packet_frag_offset >= asf_st->pkt.size
908            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
909             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
910                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
911             continue;
912         }
913
914         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
915                    asf->packet_frag_size);
916         if (s->key && s->keylen == 20)
917             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
918                             asf->packet_frag_size);
919         asf_st->frag_offset += asf->packet_frag_size;
920         /* test if whole packet is read */
921         if (asf_st->frag_offset == asf_st->pkt.size) {
922             //workaround for macroshit radio DVR-MS files
923             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
924                && asf_st->pkt.size > 100){
925                 int i;
926                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
927                 if(i == asf_st->pkt.size){
928                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
929                     asf_st->frag_offset = 0;
930                     av_free_packet(&asf_st->pkt);
931                     continue;
932                 }
933             }
934
935             /* return packet */
936             if (asf_st->ds_span > 1) {
937               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
938                     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);
939               }else{
940                 /* packet descrambling */
941                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
942                 if (newdata) {
943                     int offset = 0;
944                     while (offset < asf_st->pkt.size) {
945                         int off = offset / asf_st->ds_chunk_size;
946                         int row = off / asf_st->ds_span;
947                         int col = off % asf_st->ds_span;
948                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
949                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
950
951                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
952                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
953                         memcpy(newdata + offset,
954                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
955                                asf_st->ds_chunk_size);
956                         offset += asf_st->ds_chunk_size;
957                     }
958                     av_free(asf_st->pkt.data);
959                     asf_st->pkt.data = newdata;
960                 }
961               }
962             }
963             asf_st->frag_offset = 0;
964             *pkt= asf_st->pkt;
965             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
966             asf_st->pkt.size = 0;
967             asf_st->pkt.data = 0;
968             break; // packet completed
969         }
970     }
971     return 0;
972 }
973
974 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
975 {
976     ASFContext *asf = s->priv_data;
977
978     for (;;) {
979         int ret;
980
981         /* parse cached packets, if any */
982         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
983             return ret;
984         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
985             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
986         asf->packet_time_start = 0;
987     }
988
989     return 0;
990 }
991
992 // Added to support seeking after packets have been read
993 // If information is not reset, read_packet fails due to
994 // leftover information from previous reads
995 static void asf_reset_header(AVFormatContext *s)
996 {
997     ASFContext *asf = s->priv_data;
998     ASFStream *asf_st;
999     int i;
1000
1001     asf->packet_nb_frames = 0;
1002     asf->packet_size_left = 0;
1003     asf->packet_segments = 0;
1004     asf->packet_flags = 0;
1005     asf->packet_property = 0;
1006     asf->packet_timestamp = 0;
1007     asf->packet_segsizetype = 0;
1008     asf->packet_segments = 0;
1009     asf->packet_seq = 0;
1010     asf->packet_replic_size = 0;
1011     asf->packet_key_frame = 0;
1012     asf->packet_padsize = 0;
1013     asf->packet_frag_offset = 0;
1014     asf->packet_frag_size = 0;
1015     asf->packet_frag_timestamp = 0;
1016     asf->packet_multi_size = 0;
1017     asf->packet_obj_size = 0;
1018     asf->packet_time_delta = 0;
1019     asf->packet_time_start = 0;
1020
1021     for(i=0; i<s->nb_streams; i++){
1022         asf_st= s->streams[i]->priv_data;
1023         av_free_packet(&asf_st->pkt);
1024         asf_st->frag_offset=0;
1025         asf_st->seq=0;
1026     }
1027     asf->asf_st= NULL;
1028 }
1029
1030 static int asf_read_close(AVFormatContext *s)
1031 {
1032     int i;
1033
1034     asf_reset_header(s);
1035     for(i=0;i<s->nb_streams;i++) {
1036         AVStream *st = s->streams[i];
1037         av_free(st->codec->palctrl);
1038     }
1039     return 0;
1040 }
1041
1042 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1043 {
1044     AVPacket pkt1, *pkt = &pkt1;
1045     ASFStream *asf_st;
1046     int64_t pts;
1047     int64_t pos= *ppos;
1048     int i;
1049     int64_t start_pos[s->nb_streams];
1050
1051     for(i=0; i<s->nb_streams; i++){
1052         start_pos[i]= pos;
1053     }
1054
1055     if (s->packet_size > 0)
1056         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1057     *ppos= pos;
1058     url_fseek(s->pb, pos, SEEK_SET);
1059
1060 //printf("asf_read_pts\n");
1061     asf_reset_header(s);
1062     for(;;){
1063         if (av_read_frame(s, pkt) < 0){
1064             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1065             return AV_NOPTS_VALUE;
1066         }
1067
1068         pts= pkt->pts;
1069
1070         av_free_packet(pkt);
1071         if(pkt->flags&PKT_FLAG_KEY){
1072             i= pkt->stream_index;
1073
1074             asf_st= s->streams[i]->priv_data;
1075
1076 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1077             pos= asf_st->packet_pos;
1078
1079             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1080             start_pos[i]= asf_st->packet_pos + 1;
1081
1082             if(pkt->stream_index == stream_index)
1083                break;
1084         }
1085     }
1086
1087     *ppos= pos;
1088 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1089
1090     return pts;
1091 }
1092
1093 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1094 {
1095     ff_asf_guid g;
1096     ASFContext *asf = s->priv_data;
1097     int64_t current_pos= url_ftell(s->pb);
1098     int i;
1099
1100     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1101     get_guid(s->pb, &g);
1102     if (!guidcmp(&g, &index_guid)) {
1103         int64_t itime, last_pos=-1;
1104         int pct, ict;
1105         int64_t av_unused gsize= get_le64(s->pb);
1106         get_guid(s->pb, &g);
1107         itime=get_le64(s->pb);
1108         pct=get_le32(s->pb);
1109         ict=get_le32(s->pb);
1110         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1111
1112         for (i=0;i<ict;i++){
1113             int pktnum=get_le32(s->pb);
1114             int pktct =get_le16(s->pb);
1115             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1116             int64_t index_pts= av_rescale(itime, i, 10000);
1117
1118             if(pos != last_pos){
1119             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1120             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1121             last_pos=pos;
1122             }
1123         }
1124         asf->index_read= 1;
1125     }
1126     url_fseek(s->pb, current_pos, SEEK_SET);
1127 }
1128
1129 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1130 {
1131     ASFContext *asf = s->priv_data;
1132     AVStream *st = s->streams[stream_index];
1133     int64_t pos;
1134     int index;
1135
1136     if (s->packet_size <= 0)
1137         return -1;
1138
1139     /* Try using the protocol's read_seek if available */
1140     if(s->pb) {
1141         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1142         if(ret >= 0)
1143             asf_reset_header(s);
1144         if (ret != AVERROR(ENOSYS))
1145             return ret;
1146     }
1147
1148     if (!asf->index_read)
1149         asf_build_simple_index(s, stream_index);
1150
1151     if(!(asf->index_read && st->index_entries)){
1152         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1153             return -1;
1154     }else{
1155         index= av_index_search_timestamp(st, pts, flags);
1156         if(index<0)
1157             return -1;
1158
1159         /* find the position */
1160         pos = st->index_entries[index].pos;
1161
1162     // various attempts to find key frame have failed so far
1163     //    asf_reset_header(s);
1164     //    url_fseek(s->pb, pos, SEEK_SET);
1165     //    key_pos = pos;
1166     //     for(i=0;i<16;i++){
1167     //         pos = url_ftell(s->pb);
1168     //         if (av_read_frame(s, &pkt) < 0){
1169     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1170     //             return -1;
1171     //         }
1172     //         asf_st = s->streams[stream_index]->priv_data;
1173     //         pos += st->parser->frame_offset;
1174     //
1175     //         if (pkt.size > b) {
1176     //             b = pkt.size;
1177     //             key_pos = pos;
1178     //         }
1179     //
1180     //         av_free_packet(&pkt);
1181     //     }
1182
1183         /* do the seek */
1184         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1185         url_fseek(s->pb, pos, SEEK_SET);
1186     }
1187     asf_reset_header(s);
1188     return 0;
1189 }
1190
1191 AVInputFormat asf_demuxer = {
1192     "asf",
1193     NULL_IF_CONFIG_SMALL("ASF format"),
1194     sizeof(ASFContext),
1195     asf_probe,
1196     asf_read_header,
1197     asf_read_packet,
1198     asf_read_close,
1199     asf_read_seek,
1200     asf_read_pts,
1201     .metadata_conv = ff_asf_metadata_conv,
1202 };