asfdec: Don't read the video stream header if there isn't enough data
[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 ASF_MAX_STREAMS 127
39 #define FRAME_HEADER_SIZE 17
40 // Fix Me! FRAME_HEADER_SIZE may be different.
41
42 static const ff_asf_guid index_guid = {
43     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
44 };
45
46 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
47     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
48 };
49 /**********************************/
50 /* decoding */
51
52 static int guidcmp(const void *g1, const void *g2)
53 {
54     return memcmp(g1, g2, sizeof(ff_asf_guid));
55 }
56
57 #ifdef DEBUG
58 #define PRINT_IF_GUID(g,cmp) \
59 if (!guidcmp(g, &cmp)) \
60     dprintf(NULL, "(GUID: %s) ", #cmp)
61
62 static void print_guid(const ff_asf_guid *g)
63 {
64     int i;
65     PRINT_IF_GUID(g, ff_asf_header);
66     else PRINT_IF_GUID(g, ff_asf_file_header);
67     else PRINT_IF_GUID(g, ff_asf_stream_header);
68     else PRINT_IF_GUID(g, ff_asf_audio_stream);
69     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
70     else PRINT_IF_GUID(g, ff_asf_video_stream);
71     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
72     else PRINT_IF_GUID(g, ff_asf_command_stream);
73     else PRINT_IF_GUID(g, ff_asf_comment_header);
74     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
75     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
76     else PRINT_IF_GUID(g, ff_asf_data_header);
77     else PRINT_IF_GUID(g, index_guid);
78     else PRINT_IF_GUID(g, ff_asf_head1_guid);
79     else PRINT_IF_GUID(g, ff_asf_head2_guid);
80     else PRINT_IF_GUID(g, ff_asf_my_guid);
81     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
82     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
83     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
84     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
85     else PRINT_IF_GUID(g, ff_asf_metadata_header);
86     else PRINT_IF_GUID(g, ff_asf_marker_header);
87     else PRINT_IF_GUID(g, stream_bitrate_guid);
88     else PRINT_IF_GUID(g, ff_asf_language_guid);
89     else
90         dprintf(NULL, "(GUID: unknown) ");
91     for(i=0;i<16;i++)
92         dprintf(NULL, " 0x%02x,", (*g)[i]);
93     dprintf(NULL, "}\n");
94 }
95 #undef PRINT_IF_GUID
96 #else
97 #define print_guid(g)
98 #endif
99
100 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
101 {
102     assert(sizeof(*g) == 16);
103     get_buffer(s, *g, sizeof(*g));
104 }
105
106 #if 0
107 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
108 {
109     int len, c;
110     char *q;
111
112     len = get_le16(pb);
113     q = buf;
114     while (len > 0) {
115         c = get_le16(pb);
116         if ((q - buf) < buf_size - 1)
117             *q++ = c;
118         len--;
119     }
120     *q = '\0';
121 }
122 #endif
123
124 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
125 {
126     char* q = buf;
127     while (len > 1) {
128         uint8_t tmp;
129         uint32_t ch;
130
131         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
132         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
133     }
134     if (len > 0)
135         url_fskip(pb, len);
136     *q = '\0';
137 }
138
139 static int asf_probe(AVProbeData *pd)
140 {
141     /* check file header */
142     if (!guidcmp(pd->buf, &ff_asf_header))
143         return AVPROBE_SCORE_MAX;
144     else
145         return 0;
146 }
147
148 static int get_value(ByteIOContext *pb, int type){
149     switch(type){
150         case 2: return get_le32(pb);
151         case 3: return get_le32(pb);
152         case 4: return get_le64(pb);
153         case 5: return get_le16(pb);
154         default:return INT_MIN;
155     }
156 }
157
158 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
159 {
160     char *value;
161
162     if ((unsigned)len >= (UINT_MAX - 1)/2)
163         return;
164
165     value = av_malloc(2*len+1);
166     if (!value)
167         return;
168
169     if (type == 0) {         // UTF16-LE
170         get_str16_nolen(s->pb, len, value, 2*len + 1);
171     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
172         uint64_t num = get_value(s->pb, type);
173         snprintf(value, len, "%"PRIu64, num);
174     } else {
175         url_fskip(s->pb, len);
176         av_freep(&value);
177         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
178         return;
179     }
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         uint64_t gpos= url_ftell(pb);
209         get_guid(pb, &g);
210         gsize = get_le64(pb);
211         dprintf(s, "%08"PRIx64": ", gpos);
212         print_guid(&g);
213         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
214         if (!guidcmp(&g, &ff_asf_data_header)) {
215             asf->data_object_offset = url_ftell(pb);
216             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
217             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
218                 asf->data_object_size = gsize - 24;
219             } else {
220                 asf->data_object_size = (uint64_t)-1;
221             }
222             break;
223         }
224         if (gsize < 24)
225             return -1;
226         if (!guidcmp(&g, &ff_asf_file_header)) {
227             get_guid(pb, &asf->hdr.guid);
228             asf->hdr.file_size          = get_le64(pb);
229             asf->hdr.create_time        = get_le64(pb);
230             asf->nb_packets             = get_le64(pb);
231             asf->hdr.play_time          = get_le64(pb);
232             asf->hdr.send_time          = get_le64(pb);
233             asf->hdr.preroll            = get_le32(pb);
234             asf->hdr.ignore             = get_le32(pb);
235             asf->hdr.flags              = get_le32(pb);
236             asf->hdr.min_pktsize        = get_le32(pb);
237             asf->hdr.max_pktsize        = get_le32(pb);
238             asf->hdr.max_bitrate        = get_le32(pb);
239             s->packet_size = asf->hdr.max_pktsize;
240         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
241             enum AVMediaType type;
242             int type_specific_size, sizeX;
243             uint64_t total_size;
244             unsigned int tag1;
245             int64_t pos1, pos2, start_time;
246             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
247
248             if (s->nb_streams == ASF_MAX_STREAMS) {
249                 av_log(s, AV_LOG_ERROR, "too many streams\n");
250                 return AVERROR(EINVAL);
251             }
252
253             pos1 = url_ftell(pb);
254
255             st = av_new_stream(s, 0);
256             if (!st)
257                 return AVERROR(ENOMEM);
258             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
259             asf_st = av_mallocz(sizeof(ASFStream));
260             if (!asf_st)
261                 return AVERROR(ENOMEM);
262             st->priv_data = asf_st;
263             start_time = asf->hdr.preroll;
264
265             asf_st->stream_language_index = 128; // invalid stream index means no language info
266
267             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
268                 st->duration = asf->hdr.play_time /
269                     (10000000 / 1000) - start_time;
270             }
271             get_guid(pb, &g);
272
273             test_for_ext_stream_audio = 0;
274             if (!guidcmp(&g, &ff_asf_audio_stream)) {
275                 type = AVMEDIA_TYPE_AUDIO;
276             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
277                 type = AVMEDIA_TYPE_VIDEO;
278             } else if (!guidcmp(&g, &ff_asf_jfif_media)) {
279                 type = AVMEDIA_TYPE_VIDEO;
280                 st->codec->codec_id = CODEC_ID_MJPEG;
281             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
282                 type = AVMEDIA_TYPE_DATA;
283             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
284                 test_for_ext_stream_audio = 1;
285                 type = AVMEDIA_TYPE_UNKNOWN;
286             } else {
287                 return -1;
288             }
289             get_guid(pb, &g);
290             total_size = get_le64(pb);
291             type_specific_size = get_le32(pb);
292             get_le32(pb);
293             st->id = get_le16(pb) & 0x7f; /* stream id */
294             // mapping of asf ID to AV stream ID;
295             asf->asfid2avid[st->id] = s->nb_streams - 1;
296
297             get_le32(pb);
298
299             if (test_for_ext_stream_audio) {
300                 get_guid(pb, &g);
301                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
302                     type = AVMEDIA_TYPE_AUDIO;
303                     is_dvr_ms_audio=1;
304                     get_guid(pb, &g);
305                     get_le32(pb);
306                     get_le32(pb);
307                     get_le32(pb);
308                     get_guid(pb, &g);
309                     get_le32(pb);
310                 }
311             }
312
313             st->codec->codec_type = type;
314             if (type == AVMEDIA_TYPE_AUDIO) {
315                 ff_get_wav_header(pb, st->codec, type_specific_size);
316                 if (is_dvr_ms_audio) {
317                     // codec_id and codec_tag are unreliable in dvr_ms
318                     // files. Set them later by probing stream.
319                     st->codec->codec_id = CODEC_ID_PROBE;
320                     st->codec->codec_tag = 0;
321                 }
322                 if (st->codec->codec_id == CODEC_ID_AAC) {
323                     st->need_parsing = AVSTREAM_PARSE_NONE;
324                 } else {
325                     st->need_parsing = AVSTREAM_PARSE_FULL;
326                 }
327                 /* We have to init the frame size at some point .... */
328                 pos2 = url_ftell(pb);
329                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
330                     asf_st->ds_span = get_byte(pb);
331                     asf_st->ds_packet_size = get_le16(pb);
332                     asf_st->ds_chunk_size = get_le16(pb);
333                     get_le16(pb); //ds_data_size
334                     get_byte(pb); //ds_silence_data
335                 }
336                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
337                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
338                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
339                 if (asf_st->ds_span > 1) {
340                     if (!asf_st->ds_chunk_size
341                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
342                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
343                         asf_st->ds_span = 0; // disable descrambling
344                 }
345                 switch (st->codec->codec_id) {
346                 case CODEC_ID_MP3:
347                     st->codec->frame_size = MPA_FRAME_SIZE;
348                     break;
349                 case CODEC_ID_PCM_S16LE:
350                 case CODEC_ID_PCM_S16BE:
351                 case CODEC_ID_PCM_U16LE:
352                 case CODEC_ID_PCM_U16BE:
353                 case CODEC_ID_PCM_S8:
354                 case CODEC_ID_PCM_U8:
355                 case CODEC_ID_PCM_ALAW:
356                 case CODEC_ID_PCM_MULAW:
357                     st->codec->frame_size = 1;
358                     break;
359                 default:
360                     /* This is probably wrong, but it prevents a crash later */
361                     st->codec->frame_size = 1;
362                     break;
363                 }
364             } else if (type == AVMEDIA_TYPE_VIDEO &&
365                        gsize - (url_ftell(pb) - pos1 + 24) >= 53) {
366                 get_le32(pb);
367                 get_le32(pb);
368                 get_byte(pb);
369                 size = get_le16(pb); /* size */
370                 sizeX= get_le32(pb); /* size */
371                 st->codec->width = get_le32(pb);
372                 st->codec->height = get_le32(pb);
373                 /* not available for asf */
374                 get_le16(pb); /* panes */
375                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
376                 tag1 = get_le32(pb);
377                 url_fskip(pb, 20);
378 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
379                 size= sizeX;
380                 if (size > 40) {
381                     st->codec->extradata_size = size - 40;
382                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
383                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
384                 }
385
386                 /* Extract palette from extradata if bpp <= 8 */
387                 /* This code assumes that extradata contains only palette */
388                 /* This is true for all paletted codecs implemented in ffmpeg */
389                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
390                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
391 #if HAVE_BIGENDIAN
392                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
393                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
394 #else
395                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
396                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
397 #endif
398                     st->codec->palctrl->palette_changed = 1;
399                 }
400
401                 st->codec->codec_tag = tag1;
402                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
403                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
404                     st->need_parsing = AVSTREAM_PARSE_FULL;
405                     // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
406                     st->codec->width  =
407                     st->codec->height = 0;
408                     av_freep(&st->codec->extradata);
409                     st->codec->extradata_size=0;
410                 }
411                 if(st->codec->codec_id == CODEC_ID_H264)
412                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
413             }
414             pos2 = url_ftell(pb);
415             url_fskip(pb, gsize - (pos2 - pos1 + 24));
416         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
417             int len1, len2, len3, len4, len5;
418
419             len1 = get_le16(pb);
420             len2 = get_le16(pb);
421             len3 = get_le16(pb);
422             len4 = get_le16(pb);
423             len5 = get_le16(pb);
424             get_tag(s, "title"    , 0, len1);
425             get_tag(s, "author"   , 0, len2);
426             get_tag(s, "copyright", 0, len3);
427             get_tag(s, "comment"  , 0, len4);
428             url_fskip(pb, len5);
429         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
430             int stream_count = get_le16(pb);
431             int j;
432
433 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
434 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
435             for(j = 0; j < stream_count; j++) {
436                 int flags, bitrate, stream_id;
437
438                 flags= get_le16(pb);
439                 bitrate= get_le32(pb);
440                 stream_id= (flags & 0x7f);
441 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
442                 asf->stream_bitrates[stream_id]= bitrate;
443             }
444         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
445             int j;
446             int stream_count = get_le16(pb);
447             for(j = 0; j < stream_count; j++) {
448                 char lang[6];
449                 unsigned int lang_len = get_byte(pb);
450                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
451                 if (j < 128)
452                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
453             }
454         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
455             int desc_count, i;
456
457             desc_count = get_le16(pb);
458             for(i=0;i<desc_count;i++) {
459                     int name_len,value_type,value_len;
460                     char name[1024];
461
462                     name_len = get_le16(pb);
463                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
464                         name_len += 1;
465                     get_str16_nolen(pb, name_len, name, sizeof(name));
466                     value_type = get_le16(pb);
467                     value_len  = get_le16(pb);
468                     if (!value_type && value_len%2)
469                         value_len += 1;
470                     get_tag(s, name, value_type, value_len);
471             }
472         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
473             int n, stream_num, name_len, value_len, value_type, value_num;
474             n = get_le16(pb);
475
476             for(i=0;i<n;i++) {
477                 char name[1024];
478
479                 get_le16(pb); //lang_list_index
480                 stream_num= get_le16(pb);
481                 name_len=   get_le16(pb);
482                 value_type= get_le16(pb);
483                 value_len=  get_le32(pb);
484
485                 get_str16_nolen(pb, name_len, name, sizeof(name));
486 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
487                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
488                 url_fskip(pb, value_len - 2);
489
490                 if(stream_num<128){
491                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
492                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
493                 }
494             }
495         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
496             int ext_len, payload_ext_ct, stream_ct;
497             uint32_t ext_d, leak_rate, stream_num;
498             unsigned int stream_languageid_index;
499
500             get_le64(pb); // starttime
501             get_le64(pb); // endtime
502             leak_rate = get_le32(pb); // leak-datarate
503             get_le32(pb); // bucket-datasize
504             get_le32(pb); // init-bucket-fullness
505             get_le32(pb); // alt-leak-datarate
506             get_le32(pb); // alt-bucket-datasize
507             get_le32(pb); // alt-init-bucket-fullness
508             get_le32(pb); // max-object-size
509             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
510             stream_num = get_le16(pb); // stream-num
511
512             stream_languageid_index = get_le16(pb); // stream-language-id-index
513             if (stream_num < 128)
514                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
515
516             get_le64(pb); // avg frametime in 100ns units
517             stream_ct = get_le16(pb); //stream-name-count
518             payload_ext_ct = get_le16(pb); //payload-extension-system-count
519
520             if (stream_num < 128)
521                 bitrate[stream_num] = leak_rate;
522
523             for (i=0; i<stream_ct; i++){
524                 get_le16(pb);
525                 ext_len = get_le16(pb);
526                 url_fseek(pb, ext_len, SEEK_CUR);
527             }
528
529             for (i=0; i<payload_ext_ct; i++){
530                 get_guid(pb, &g);
531                 ext_d=get_le16(pb);
532                 ext_len=get_le32(pb);
533                 url_fseek(pb, ext_len, SEEK_CUR);
534             }
535
536             // there could be a optional stream properties object to follow
537             // if so the next iteration will pick it up
538             continue;
539         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
540             int v1, v2;
541             get_guid(pb, &g);
542             v1 = get_le32(pb);
543             v2 = get_le16(pb);
544             continue;
545         } else if (!guidcmp(&g, &ff_asf_marker_header)) {
546             int i, count, name_len;
547             char name[1024];
548
549             get_le64(pb);            // reserved 16 bytes
550             get_le64(pb);            // ...
551             count = get_le32(pb);    // markers count
552             get_le16(pb);            // reserved 2 bytes
553             name_len = get_le16(pb); // name length
554             for(i=0;i<name_len;i++){
555                 get_byte(pb); // skip the name
556             }
557
558             for(i=0;i<count;i++){
559                 int64_t pres_time;
560                 int name_len;
561
562                 get_le64(pb);             // offset, 8 bytes
563                 pres_time = get_le64(pb); // presentation time
564                 get_le16(pb);             // entry length
565                 get_le32(pb);             // send time
566                 get_le32(pb);             // flags
567                 name_len = get_le32(pb);  // name length
568                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
569                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
570             }
571 #if 0
572         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
573             int len, v1, n, num;
574             char str[256], *q;
575             char tag[16];
576
577             get_guid(pb, &g);
578             print_guid(&g);
579
580             n = get_le32(pb);
581             for(i=0;i<n;i++) {
582                 num = get_le16(pb); /* stream number */
583                 get_str16(pb, str, sizeof(str));
584                 get_str16(pb, str, sizeof(str));
585                 len = get_le16(pb);
586                 q = tag;
587                 while (len > 0) {
588                     v1 = get_byte(pb);
589                     if ((q - tag) < sizeof(tag) - 1)
590                         *q++ = v1;
591                     len--;
592                 }
593                 *q = '\0';
594             }
595 #endif
596         } else if (url_feof(pb)) {
597             return -1;
598         } else {
599             if (!s->keylen) {
600                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
601                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
602                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
603                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
604                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
605                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
606                 }
607             }
608         }
609         if(url_ftell(pb) != gpos + gsize)
610             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
611         url_fseek(pb, gpos + gsize, SEEK_SET);
612     }
613     get_guid(pb, &g);
614     get_le64(pb);
615     get_byte(pb);
616     get_byte(pb);
617     if (url_feof(pb))
618         return -1;
619     asf->data_offset = url_ftell(pb);
620     asf->packet_size_left = 0;
621
622
623     for(i=0; i<128; i++){
624         int stream_num= asf->asfid2avid[i];
625         if(stream_num>=0){
626             AVStream *st = s->streams[stream_num];
627             if (!st->codec->bit_rate)
628                 st->codec->bit_rate = bitrate[i];
629             if (dar[i].num > 0 && dar[i].den > 0)
630                 av_reduce(&st->sample_aspect_ratio.num,
631                           &st->sample_aspect_ratio.den,
632                           dar[i].num, dar[i].den, INT_MAX);
633 //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);
634
635             // copy and convert language codes to the frontend
636             if (asf->streams[i].stream_language_index < 128) {
637                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
638                 if (rfc1766 && strlen(rfc1766) > 1) {
639                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
640                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
641                     if (iso6392)
642                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
643                 }
644             }
645         }
646     }
647
648     return 0;
649 }
650
651 #define DO_2BITS(bits, var, defval) \
652     switch (bits & 3) \
653     { \
654     case 3: var = get_le32(pb); rsize += 4; break; \
655     case 2: var = get_le16(pb); rsize += 2; break; \
656     case 1: var = get_byte(pb); rsize++; break; \
657     default: var = defval; break; \
658     }
659
660 /**
661  * Load a single ASF packet into the demuxer.
662  * @param s demux context
663  * @param pb context to read data from
664  * @return 0 on success, <0 on error
665  */
666 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
667 {
668     ASFContext *asf = s->priv_data;
669     uint32_t packet_length, padsize;
670     int rsize = 8;
671     int c, d, e, off;
672
673     // if we do not know packet size, allow skipping up to 32 kB
674     off= 32768;
675     if (s->packet_size > 0)
676         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
677
678     c=d=e=-1;
679     while(off-- > 0){
680         c=d; d=e;
681         e= get_byte(pb);
682         if(c == 0x82 && !d && !e)
683             break;
684     }
685
686     if (c != 0x82) {
687         /**
688          * This code allows handling of -EAGAIN at packet boundaries (i.e.
689          * if the packet sync code above triggers -EAGAIN). This does not
690          * imply complete -EAGAIN handling support at random positions in
691          * the stream.
692          */
693         if (url_ferror(pb) == AVERROR(EAGAIN))
694             return AVERROR(EAGAIN);
695         if (!url_feof(pb))
696             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
697     }
698     if ((c & 0x8f) == 0x82) {
699         if (d || e) {
700             if (!url_feof(pb))
701                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
702             return -1;
703         }
704         c= get_byte(pb);
705         d= get_byte(pb);
706         rsize+=3;
707     }else{
708         url_fseek(pb, -1, SEEK_CUR); //FIXME
709     }
710
711     asf->packet_flags    = c;
712     asf->packet_property = d;
713
714     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
715     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
716     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
717
718     //the following checks prevent overflows and infinite loops
719     if(!packet_length || packet_length >= (1U<<29)){
720         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
721         return -1;
722     }
723     if(padsize >= packet_length){
724         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
725         return -1;
726     }
727
728     asf->packet_timestamp = get_le32(pb);
729     get_le16(pb); /* duration */
730     // rsize has at least 11 bytes which have to be present
731
732     if (asf->packet_flags & 0x01) {
733         asf->packet_segsizetype = get_byte(pb); rsize++;
734         asf->packet_segments = asf->packet_segsizetype & 0x3f;
735     } else {
736         asf->packet_segments = 1;
737         asf->packet_segsizetype = 0x80;
738     }
739     asf->packet_size_left = packet_length - padsize - rsize;
740     if (packet_length < asf->hdr.min_pktsize)
741         padsize += asf->hdr.min_pktsize - packet_length;
742     asf->packet_padsize = padsize;
743     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
744     return 0;
745 }
746
747 /**
748  *
749  * @return <0 if error
750  */
751 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
752     ASFContext *asf = s->priv_data;
753     int rsize = 1;
754     int num = get_byte(pb);
755     int64_t ts0, ts1;
756
757     asf->packet_segments--;
758     asf->packet_key_frame = num >> 7;
759     asf->stream_index = asf->asfid2avid[num & 0x7f];
760     // sequence should be ignored!
761     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
762     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
763     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
764 //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);
765     if (asf->packet_replic_size >= 8) {
766         asf->packet_obj_size = get_le32(pb);
767         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
768             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
769             return -1;
770         }
771         asf->packet_frag_timestamp = get_le32(pb); // timestamp
772         if(asf->packet_replic_size >= 8+38+4){
773 //            for(i=0; i<asf->packet_replic_size-8; i++)
774 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
775 //            av_log(s, AV_LOG_DEBUG, "\n");
776             url_fskip(pb, 10);
777             ts0= get_le64(pb);
778             ts1= get_le64(pb);
779             url_fskip(pb, 12);
780             get_le32(pb);
781             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
782             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
783             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
784         }else
785             url_fskip(pb, asf->packet_replic_size - 8);
786         rsize += asf->packet_replic_size; // FIXME - check validity
787     } else if (asf->packet_replic_size==1){
788         // multipacket - frag_offset is beginning timestamp
789         asf->packet_time_start = asf->packet_frag_offset;
790         asf->packet_frag_offset = 0;
791         asf->packet_frag_timestamp = asf->packet_timestamp;
792
793         asf->packet_time_delta = get_byte(pb);
794         rsize++;
795     }else if(asf->packet_replic_size!=0){
796         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
797         return -1;
798     }
799     if (asf->packet_flags & 0x01) {
800         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
801         if(asf->packet_frag_size > asf->packet_size_left - rsize){
802             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
803             return -1;
804         }
805         //printf("Fragsize %d\n", asf->packet_frag_size);
806     } else {
807         asf->packet_frag_size = asf->packet_size_left - rsize;
808         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
809     }
810     if (asf->packet_replic_size == 1) {
811         asf->packet_multi_size = asf->packet_frag_size;
812         if (asf->packet_multi_size > asf->packet_size_left)
813             return -1;
814     }
815     asf->packet_size_left -= rsize;
816     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
817
818     return 0;
819 }
820
821 /**
822  * Parse data from individual ASF packets (which were previously loaded
823  * with asf_get_packet()).
824  * @param s demux context
825  * @param pb context to read data from
826  * @param pkt pointer to store packet data into
827  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
828  *          packets need to be loaded (through asf_get_packet())
829  */
830 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
831 {
832     ASFContext *asf = s->priv_data;
833     ASFStream *asf_st = 0;
834     for (;;) {
835         if(url_feof(pb))
836             return AVERROR_EOF;
837         if (asf->packet_size_left < FRAME_HEADER_SIZE
838             || asf->packet_segments < 1) {
839             //asf->packet_size_left <= asf->packet_padsize) {
840             int ret = asf->packet_size_left + asf->packet_padsize;
841             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
842             assert(ret>=0);
843             /* fail safe */
844             url_fskip(pb, ret);
845
846             asf->packet_pos= url_ftell(pb);
847             if (asf->data_object_size != (uint64_t)-1 &&
848                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
849                 return AVERROR_EOF; /* Do not exceed the size of the data object */
850             return 1;
851         }
852         if (asf->packet_time_start == 0) {
853             if(asf_read_frame_header(s, pb) < 0){
854                 asf->packet_segments= 0;
855                 continue;
856             }
857             if (asf->stream_index < 0
858                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
859                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
860                 ) {
861                 asf->packet_time_start = 0;
862                 /* unhandled packet (should not happen) */
863                 url_fskip(pb, asf->packet_frag_size);
864                 asf->packet_size_left -= asf->packet_frag_size;
865                 if(asf->stream_index < 0)
866                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
867                 continue;
868             }
869             asf->asf_st = s->streams[asf->stream_index]->priv_data;
870         }
871         asf_st = asf->asf_st;
872
873         if (asf->packet_replic_size == 1) {
874             // frag_offset is here used as the beginning timestamp
875             asf->packet_frag_timestamp = asf->packet_time_start;
876             asf->packet_time_start += asf->packet_time_delta;
877             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
878             asf->packet_size_left--;
879             asf->packet_multi_size--;
880             if (asf->packet_multi_size < asf->packet_obj_size)
881             {
882                 asf->packet_time_start = 0;
883                 url_fskip(pb, asf->packet_multi_size);
884                 asf->packet_size_left -= asf->packet_multi_size;
885                 continue;
886             }
887             asf->packet_multi_size -= asf->packet_obj_size;
888             //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);
889         }
890         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
891               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
892            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
893             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
894                 asf_st->frag_offset, asf->packet_frag_size,
895                 asf->packet_obj_size, asf_st->pkt.size);
896             asf->packet_obj_size= asf_st->pkt.size;
897         }
898
899         if (   asf_st->pkt.size != asf->packet_obj_size
900             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
901             if(asf_st->pkt.data){
902                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
903                 asf_st->frag_offset = 0;
904                 av_free_packet(&asf_st->pkt);
905             }
906             /* new packet */
907             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
908             asf_st->seq = asf->packet_seq;
909             asf_st->pkt.dts = asf->packet_frag_timestamp;
910             asf_st->pkt.stream_index = asf->stream_index;
911             asf_st->pkt.pos =
912             asf_st->packet_pos= asf->packet_pos;
913 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
914 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
915 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
916             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
917                 asf->packet_key_frame = 1;
918             if (asf->packet_key_frame)
919                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
920         }
921
922         /* read data */
923         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
924         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
925         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
926         asf->packet_size_left -= asf->packet_frag_size;
927         if (asf->packet_size_left < 0)
928             continue;
929
930         if(   asf->packet_frag_offset >= asf_st->pkt.size
931            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
932             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
933                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
934             continue;
935         }
936
937         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
938                    asf->packet_frag_size);
939         if (s->key && s->keylen == 20)
940             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
941                             asf->packet_frag_size);
942         asf_st->frag_offset += asf->packet_frag_size;
943         /* test if whole packet is read */
944         if (asf_st->frag_offset == asf_st->pkt.size) {
945             //workaround for macroshit radio DVR-MS files
946             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
947                && asf_st->pkt.size > 100){
948                 int i;
949                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
950                 if(i == asf_st->pkt.size){
951                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
952                     asf_st->frag_offset = 0;
953                     av_free_packet(&asf_st->pkt);
954                     continue;
955                 }
956             }
957
958             /* return packet */
959             if (asf_st->ds_span > 1) {
960               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
961                     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);
962               }else{
963                 /* packet descrambling */
964                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
965                 if (newdata) {
966                     int offset = 0;
967                     while (offset < asf_st->pkt.size) {
968                         int off = offset / asf_st->ds_chunk_size;
969                         int row = off / asf_st->ds_span;
970                         int col = off % asf_st->ds_span;
971                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
972                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
973
974                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
975                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
976                         memcpy(newdata + offset,
977                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
978                                asf_st->ds_chunk_size);
979                         offset += asf_st->ds_chunk_size;
980                     }
981                     av_free(asf_st->pkt.data);
982                     asf_st->pkt.data = newdata;
983                 }
984               }
985             }
986             asf_st->frag_offset = 0;
987             *pkt= asf_st->pkt;
988             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
989             asf_st->pkt.size = 0;
990             asf_st->pkt.data = 0;
991             break; // packet completed
992         }
993     }
994     return 0;
995 }
996
997 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
998 {
999     ASFContext *asf = s->priv_data;
1000
1001     for (;;) {
1002         int ret;
1003
1004         /* parse cached packets, if any */
1005         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1006             return ret;
1007         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1008             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1009         asf->packet_time_start = 0;
1010     }
1011
1012     return 0;
1013 }
1014
1015 // Added to support seeking after packets have been read
1016 // If information is not reset, read_packet fails due to
1017 // leftover information from previous reads
1018 static void asf_reset_header(AVFormatContext *s)
1019 {
1020     ASFContext *asf = s->priv_data;
1021     ASFStream *asf_st;
1022     int i;
1023
1024     asf->packet_nb_frames = 0;
1025     asf->packet_size_left = 0;
1026     asf->packet_segments = 0;
1027     asf->packet_flags = 0;
1028     asf->packet_property = 0;
1029     asf->packet_timestamp = 0;
1030     asf->packet_segsizetype = 0;
1031     asf->packet_segments = 0;
1032     asf->packet_seq = 0;
1033     asf->packet_replic_size = 0;
1034     asf->packet_key_frame = 0;
1035     asf->packet_padsize = 0;
1036     asf->packet_frag_offset = 0;
1037     asf->packet_frag_size = 0;
1038     asf->packet_frag_timestamp = 0;
1039     asf->packet_multi_size = 0;
1040     asf->packet_obj_size = 0;
1041     asf->packet_time_delta = 0;
1042     asf->packet_time_start = 0;
1043
1044     for(i=0; i<s->nb_streams; i++){
1045         asf_st= s->streams[i]->priv_data;
1046         av_free_packet(&asf_st->pkt);
1047         asf_st->frag_offset=0;
1048         asf_st->seq=0;
1049     }
1050     asf->asf_st= NULL;
1051 }
1052
1053 static int asf_read_close(AVFormatContext *s)
1054 {
1055     int i;
1056
1057     asf_reset_header(s);
1058     for(i=0;i<s->nb_streams;i++) {
1059         AVStream *st = s->streams[i];
1060         av_free(st->codec->palctrl);
1061     }
1062     return 0;
1063 }
1064
1065 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1066 {
1067     AVPacket pkt1, *pkt = &pkt1;
1068     ASFStream *asf_st;
1069     int64_t pts;
1070     int64_t pos= *ppos;
1071     int i;
1072     int64_t start_pos[ASF_MAX_STREAMS];
1073
1074     for(i=0; i<s->nb_streams; i++){
1075         start_pos[i]= pos;
1076     }
1077
1078     if (s->packet_size > 0)
1079         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1080     *ppos= pos;
1081     url_fseek(s->pb, pos, SEEK_SET);
1082
1083 //printf("asf_read_pts\n");
1084     asf_reset_header(s);
1085     for(;;){
1086         if (av_read_frame(s, pkt) < 0){
1087             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1088             return AV_NOPTS_VALUE;
1089         }
1090
1091         pts= pkt->pts;
1092
1093         av_free_packet(pkt);
1094         if(pkt->flags&AV_PKT_FLAG_KEY){
1095             i= pkt->stream_index;
1096
1097             asf_st= s->streams[i]->priv_data;
1098
1099 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1100             pos= asf_st->packet_pos;
1101
1102             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1103             start_pos[i]= asf_st->packet_pos + 1;
1104
1105             if(pkt->stream_index == stream_index)
1106                break;
1107         }
1108     }
1109
1110     *ppos= pos;
1111 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1112
1113     return pts;
1114 }
1115
1116 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1117 {
1118     ff_asf_guid g;
1119     ASFContext *asf = s->priv_data;
1120     int64_t current_pos= url_ftell(s->pb);
1121     int i;
1122
1123     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1124     get_guid(s->pb, &g);
1125     if (!guidcmp(&g, &index_guid)) {
1126         int64_t itime, last_pos=-1;
1127         int pct, ict;
1128         int64_t av_unused gsize= get_le64(s->pb);
1129         get_guid(s->pb, &g);
1130         itime=get_le64(s->pb);
1131         pct=get_le32(s->pb);
1132         ict=get_le32(s->pb);
1133         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1134
1135         for (i=0;i<ict;i++){
1136             int pktnum=get_le32(s->pb);
1137             int pktct =get_le16(s->pb);
1138             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1139             int64_t index_pts= av_rescale(itime, i, 10000);
1140
1141             if(pos != last_pos){
1142             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1143             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1144             last_pos=pos;
1145             }
1146         }
1147         asf->index_read= 1;
1148     }
1149     url_fseek(s->pb, current_pos, SEEK_SET);
1150 }
1151
1152 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1153 {
1154     ASFContext *asf = s->priv_data;
1155     AVStream *st = s->streams[stream_index];
1156     int64_t pos;
1157     int index;
1158
1159     if (s->packet_size <= 0)
1160         return -1;
1161
1162     /* Try using the protocol's read_seek if available */
1163     if(s->pb) {
1164         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1165         if(ret >= 0)
1166             asf_reset_header(s);
1167         if (ret != AVERROR(ENOSYS))
1168             return ret;
1169     }
1170
1171     if (!asf->index_read)
1172         asf_build_simple_index(s, stream_index);
1173
1174     if(!(asf->index_read && st->index_entries)){
1175         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1176             return -1;
1177     }else{
1178         index= av_index_search_timestamp(st, pts, flags);
1179         if(index<0)
1180             return -1;
1181
1182         /* find the position */
1183         pos = st->index_entries[index].pos;
1184
1185     // various attempts to find key frame have failed so far
1186     //    asf_reset_header(s);
1187     //    url_fseek(s->pb, pos, SEEK_SET);
1188     //    key_pos = pos;
1189     //     for(i=0;i<16;i++){
1190     //         pos = url_ftell(s->pb);
1191     //         if (av_read_frame(s, &pkt) < 0){
1192     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1193     //             return -1;
1194     //         }
1195     //         asf_st = s->streams[stream_index]->priv_data;
1196     //         pos += st->parser->frame_offset;
1197     //
1198     //         if (pkt.size > b) {
1199     //             b = pkt.size;
1200     //             key_pos = pos;
1201     //         }
1202     //
1203     //         av_free_packet(&pkt);
1204     //     }
1205
1206         /* do the seek */
1207         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1208         url_fseek(s->pb, pos, SEEK_SET);
1209     }
1210     asf_reset_header(s);
1211     return 0;
1212 }
1213
1214 AVInputFormat asf_demuxer = {
1215     "asf",
1216     NULL_IF_CONFIG_SMALL("ASF format"),
1217     sizeof(ASFContext),
1218     asf_probe,
1219     asf_read_header,
1220     asf_read_packet,
1221     asf_read_close,
1222     asf_read_seek,
1223     asf_read_pts,
1224     .metadata_conv = ff_asf_metadata_conv,
1225 };