Replace dprintf with av_dlog
[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 int ff_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 (!ff_guidcmp(g, &cmp)) \
60     av_dlog(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         av_dlog(NULL, "(GUID: unknown) ");
91     for(i=0;i<16;i++)
92         av_dlog(NULL, " 0x%02x,", (*g)[i]);
93     av_dlog(NULL, "}\n");
94 }
95 #undef PRINT_IF_GUID
96 #else
97 #define print_guid(g)
98 #endif
99
100 void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
101 {
102     assert(sizeof(*g) == 16);
103     get_buffer(s, *g, sizeof(*g));
104 }
105
106 static int asf_probe(AVProbeData *pd)
107 {
108     /* check file header */
109     if (!ff_guidcmp(pd->buf, &ff_asf_header))
110         return AVPROBE_SCORE_MAX;
111     else
112         return 0;
113 }
114
115 static int get_value(ByteIOContext *pb, int type){
116     switch(type){
117         case 2: return get_le32(pb);
118         case 3: return get_le32(pb);
119         case 4: return get_le64(pb);
120         case 5: return get_le16(pb);
121         default:return INT_MIN;
122     }
123 }
124
125 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
126 {
127     char *value;
128     int64_t off = url_ftell(s->pb);
129
130     if ((unsigned)len >= (UINT_MAX - 1)/2)
131         return;
132
133     value = av_malloc(2*len+1);
134     if (!value)
135         goto finish;
136
137     if (type == 0) {         // UTF16-LE
138         avio_get_str16le(s->pb, len, value, 2*len + 1);
139     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
140         uint64_t num = get_value(s->pb, type);
141         snprintf(value, len, "%"PRIu64, num);
142     } else {
143         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
144         goto finish;
145     }
146     av_metadata_set2(&s->metadata, key, value, 0);
147 finish:
148     av_freep(&value);
149     url_fseek(s->pb, off + len, SEEK_SET);
150 }
151
152 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
153 {
154     ASFContext *asf = s->priv_data;
155     ff_asf_guid g;
156     ByteIOContext *pb = s->pb;
157     AVStream *st;
158     ASFStream *asf_st;
159     int size, i;
160     int64_t gsize;
161     AVRational dar[128];
162     uint32_t bitrate[128];
163
164     memset(dar, 0, sizeof(dar));
165     memset(bitrate, 0, sizeof(bitrate));
166
167     ff_get_guid(pb, &g);
168     if (ff_guidcmp(&g, &ff_asf_header))
169         return -1;
170     get_le64(pb);
171     get_le32(pb);
172     get_byte(pb);
173     get_byte(pb);
174     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
175     for(;;) {
176         uint64_t gpos= url_ftell(pb);
177         int ret;
178         ff_get_guid(pb, &g);
179         gsize = get_le64(pb);
180         av_dlog(s, "%08"PRIx64": ", gpos);
181         print_guid(&g);
182         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
183         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
184             asf->data_object_offset = url_ftell(pb);
185             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
186             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
187                 asf->data_object_size = gsize - 24;
188             } else {
189                 asf->data_object_size = (uint64_t)-1;
190             }
191             break;
192         }
193         if (gsize < 24)
194             return -1;
195         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
196             ff_get_guid(pb, &asf->hdr.guid);
197             asf->hdr.file_size          = get_le64(pb);
198             asf->hdr.create_time        = get_le64(pb);
199             asf->nb_packets             = get_le64(pb);
200             asf->hdr.play_time          = get_le64(pb);
201             asf->hdr.send_time          = get_le64(pb);
202             asf->hdr.preroll            = get_le32(pb);
203             asf->hdr.ignore             = get_le32(pb);
204             asf->hdr.flags              = get_le32(pb);
205             asf->hdr.min_pktsize        = get_le32(pb);
206             asf->hdr.max_pktsize        = get_le32(pb);
207             asf->hdr.max_bitrate        = get_le32(pb);
208             s->packet_size = asf->hdr.max_pktsize;
209         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
210             enum AVMediaType type;
211             int type_specific_size, sizeX;
212             uint64_t total_size;
213             unsigned int tag1;
214             int64_t pos1, pos2, start_time;
215             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
216
217             if (s->nb_streams == ASF_MAX_STREAMS) {
218                 av_log(s, AV_LOG_ERROR, "too many streams\n");
219                 return AVERROR(EINVAL);
220             }
221
222             pos1 = url_ftell(pb);
223
224             st = av_new_stream(s, 0);
225             if (!st)
226                 return AVERROR(ENOMEM);
227             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
228             asf_st = av_mallocz(sizeof(ASFStream));
229             if (!asf_st)
230                 return AVERROR(ENOMEM);
231             st->priv_data = asf_st;
232             start_time = asf->hdr.preroll;
233
234             asf_st->stream_language_index = 128; // invalid stream index means no language info
235
236             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
237                 st->duration = asf->hdr.play_time /
238                     (10000000 / 1000) - start_time;
239             }
240             ff_get_guid(pb, &g);
241
242             test_for_ext_stream_audio = 0;
243             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
244                 type = AVMEDIA_TYPE_AUDIO;
245             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
246                 type = AVMEDIA_TYPE_VIDEO;
247             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
248                 type = AVMEDIA_TYPE_VIDEO;
249                 st->codec->codec_id = CODEC_ID_MJPEG;
250             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
251                 type = AVMEDIA_TYPE_DATA;
252             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
253                 test_for_ext_stream_audio = 1;
254                 type = AVMEDIA_TYPE_UNKNOWN;
255             } else {
256                 return -1;
257             }
258             ff_get_guid(pb, &g);
259             total_size = get_le64(pb);
260             type_specific_size = get_le32(pb);
261             get_le32(pb);
262             st->id = get_le16(pb) & 0x7f; /* stream id */
263             // mapping of asf ID to AV stream ID;
264             asf->asfid2avid[st->id] = s->nb_streams - 1;
265
266             get_le32(pb);
267
268             if (test_for_ext_stream_audio) {
269                 ff_get_guid(pb, &g);
270                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
271                     type = AVMEDIA_TYPE_AUDIO;
272                     is_dvr_ms_audio=1;
273                     ff_get_guid(pb, &g);
274                     get_le32(pb);
275                     get_le32(pb);
276                     get_le32(pb);
277                     ff_get_guid(pb, &g);
278                     get_le32(pb);
279                 }
280             }
281
282             st->codec->codec_type = type;
283             if (type == AVMEDIA_TYPE_AUDIO) {
284                 ff_get_wav_header(pb, st->codec, type_specific_size);
285                 if (is_dvr_ms_audio) {
286                     // codec_id and codec_tag are unreliable in dvr_ms
287                     // files. Set them later by probing stream.
288                     st->codec->codec_id = CODEC_ID_PROBE;
289                     st->codec->codec_tag = 0;
290                 }
291                 if (st->codec->codec_id == CODEC_ID_AAC) {
292                     st->need_parsing = AVSTREAM_PARSE_NONE;
293                 } else {
294                     st->need_parsing = AVSTREAM_PARSE_FULL;
295                 }
296                 /* We have to init the frame size at some point .... */
297                 pos2 = url_ftell(pb);
298                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
299                     asf_st->ds_span = get_byte(pb);
300                     asf_st->ds_packet_size = get_le16(pb);
301                     asf_st->ds_chunk_size = get_le16(pb);
302                     get_le16(pb); //ds_data_size
303                     get_byte(pb); //ds_silence_data
304                 }
305                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
306                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
307                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
308                 if (asf_st->ds_span > 1) {
309                     if (!asf_st->ds_chunk_size
310                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
311                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
312                         asf_st->ds_span = 0; // disable descrambling
313                 }
314                 switch (st->codec->codec_id) {
315                 case CODEC_ID_MP3:
316                     st->codec->frame_size = MPA_FRAME_SIZE;
317                     break;
318                 case CODEC_ID_PCM_S16LE:
319                 case CODEC_ID_PCM_S16BE:
320                 case CODEC_ID_PCM_U16LE:
321                 case CODEC_ID_PCM_U16BE:
322                 case CODEC_ID_PCM_S8:
323                 case CODEC_ID_PCM_U8:
324                 case CODEC_ID_PCM_ALAW:
325                 case CODEC_ID_PCM_MULAW:
326                     st->codec->frame_size = 1;
327                     break;
328                 default:
329                     /* This is probably wrong, but it prevents a crash later */
330                     st->codec->frame_size = 1;
331                     break;
332                 }
333             } else if (type == AVMEDIA_TYPE_VIDEO &&
334                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
335                 get_le32(pb);
336                 get_le32(pb);
337                 get_byte(pb);
338                 size = get_le16(pb); /* size */
339                 sizeX= get_le32(pb); /* size */
340                 st->codec->width = get_le32(pb);
341                 st->codec->height = get_le32(pb);
342                 /* not available for asf */
343                 get_le16(pb); /* panes */
344                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
345                 tag1 = get_le32(pb);
346                 url_fskip(pb, 20);
347 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
348                 size= sizeX;
349                 if (size > 40) {
350                     st->codec->extradata_size = size - 40;
351                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
352                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
353                 }
354
355                 /* Extract palette from extradata if bpp <= 8 */
356                 /* This code assumes that extradata contains only palette */
357                 /* This is true for all paletted codecs implemented in ffmpeg */
358                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
359                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
360 #if HAVE_BIGENDIAN
361                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
362                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
363 #else
364                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
365                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
366 #endif
367                     st->codec->palctrl->palette_changed = 1;
368                 }
369
370                 st->codec->codec_tag = tag1;
371                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
372                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
373                     st->need_parsing = AVSTREAM_PARSE_FULL;
374                     // 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
375                     st->codec->width  =
376                     st->codec->height = 0;
377                     av_freep(&st->codec->extradata);
378                     st->codec->extradata_size=0;
379                 }
380                 if(st->codec->codec_id == CODEC_ID_H264)
381                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
382             }
383             pos2 = url_ftell(pb);
384             url_fskip(pb, gsize - (pos2 - pos1 + 24));
385         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
386             int len1, len2, len3, len4, len5;
387
388             len1 = get_le16(pb);
389             len2 = get_le16(pb);
390             len3 = get_le16(pb);
391             len4 = get_le16(pb);
392             len5 = get_le16(pb);
393             get_tag(s, "title"    , 0, len1);
394             get_tag(s, "author"   , 0, len2);
395             get_tag(s, "copyright", 0, len3);
396             get_tag(s, "comment"  , 0, len4);
397             url_fskip(pb, len5);
398         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
399             int stream_count = get_le16(pb);
400             int j;
401
402 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
403 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
404             for(j = 0; j < stream_count; j++) {
405                 int flags, bitrate, stream_id;
406
407                 flags= get_le16(pb);
408                 bitrate= get_le32(pb);
409                 stream_id= (flags & 0x7f);
410 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
411                 asf->stream_bitrates[stream_id]= bitrate;
412             }
413         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
414             int j;
415             int stream_count = get_le16(pb);
416             for(j = 0; j < stream_count; j++) {
417                 char lang[6];
418                 unsigned int lang_len = get_byte(pb);
419                 if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
420                     url_fskip(pb, lang_len - ret);
421                 if (j < 128)
422                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
423             }
424         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
425             int desc_count, i;
426
427             desc_count = get_le16(pb);
428             for(i=0;i<desc_count;i++) {
429                     int name_len,value_type,value_len;
430                     char name[1024];
431
432                     name_len = get_le16(pb);
433                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
434                         name_len += 1;
435                     if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
436                         url_fskip(pb, name_len - ret);
437                     value_type = get_le16(pb);
438                     value_len  = get_le16(pb);
439                     if (!value_type && value_len%2)
440                         value_len += 1;
441                     /**
442                      * My sample has that stream set to 0 maybe that mean the container.
443                      * Asf stream count start at 1. I am using 0 to the container value since it's unused
444                      */
445                     if (!strcmp(name, "AspectRatioX")){
446                         dar[0].num= get_value(s->pb, value_type);
447                     } else if(!strcmp(name, "AspectRatioY")){
448                         dar[0].den= get_value(s->pb, value_type);
449                     } else
450                         get_tag(s, name, value_type, value_len);
451             }
452         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
453             int n, stream_num, name_len, value_len, value_type, value_num;
454             n = get_le16(pb);
455
456             for(i=0;i<n;i++) {
457                 char name[1024];
458
459                 get_le16(pb); //lang_list_index
460                 stream_num= get_le16(pb);
461                 name_len=   get_le16(pb);
462                 value_type= get_le16(pb);
463                 value_len=  get_le32(pb);
464
465                 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
466                     url_fskip(pb, name_len - ret);
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 (!ff_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                 ff_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             continue;
520         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
521             int v1, v2;
522             ff_get_guid(pb, &g);
523             v1 = get_le32(pb);
524             v2 = get_le16(pb);
525             continue;
526         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
527             int i, count, name_len;
528             char name[1024];
529
530             get_le64(pb);            // reserved 16 bytes
531             get_le64(pb);            // ...
532             count = get_le32(pb);    // markers count
533             get_le16(pb);            // reserved 2 bytes
534             name_len = get_le16(pb); // name length
535             for(i=0;i<name_len;i++){
536                 get_byte(pb); // skip the name
537             }
538
539             for(i=0;i<count;i++){
540                 int64_t pres_time;
541                 int name_len;
542
543                 get_le64(pb);             // offset, 8 bytes
544                 pres_time = get_le64(pb); // presentation time
545                 get_le16(pb);             // entry length
546                 get_le32(pb);             // send time
547                 get_le32(pb);             // flags
548                 name_len = get_le32(pb);  // name length
549                 if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
550                     url_fskip(pb, name_len - ret);
551                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
552             }
553         } else if (url_feof(pb)) {
554             return -1;
555         } else {
556             if (!s->keylen) {
557                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
558                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
559                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
560                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
561                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
562                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
563                 }
564             }
565         }
566         if(url_ftell(pb) != gpos + gsize)
567             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
568         url_fseek(pb, gpos + gsize, SEEK_SET);
569     }
570     ff_get_guid(pb, &g);
571     get_le64(pb);
572     get_byte(pb);
573     get_byte(pb);
574     if (url_feof(pb))
575         return -1;
576     asf->data_offset = url_ftell(pb);
577     asf->packet_size_left = 0;
578
579
580     for(i=0; i<128; i++){
581         int stream_num= asf->asfid2avid[i];
582         if(stream_num>=0){
583             AVStream *st = s->streams[stream_num];
584             if (!st->codec->bit_rate)
585                 st->codec->bit_rate = bitrate[i];
586             if (dar[i].num > 0 && dar[i].den > 0){
587                 av_reduce(&st->sample_aspect_ratio.num,
588                           &st->sample_aspect_ratio.den,
589                           dar[i].num, dar[i].den, INT_MAX);
590             } else if ((dar[0].num > 0) && (dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
591                 av_reduce(&st->sample_aspect_ratio.num,
592                           &st->sample_aspect_ratio.den,
593                           dar[0].num, dar[0].den, INT_MAX);
594
595 //av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
596
597             // copy and convert language codes to the frontend
598             if (asf->streams[i].stream_language_index < 128) {
599                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
600                 if (rfc1766 && strlen(rfc1766) > 1) {
601                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
602                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
603                     if (iso6392)
604                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
605                 }
606             }
607         }
608     }
609
610     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
611
612     return 0;
613 }
614
615 #define DO_2BITS(bits, var, defval) \
616     switch (bits & 3) \
617     { \
618     case 3: var = get_le32(pb); rsize += 4; break; \
619     case 2: var = get_le16(pb); rsize += 2; break; \
620     case 1: var = get_byte(pb); rsize++; break; \
621     default: var = defval; break; \
622     }
623
624 /**
625  * Load a single ASF packet into the demuxer.
626  * @param s demux context
627  * @param pb context to read data from
628  * @return 0 on success, <0 on error
629  */
630 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
631 {
632     ASFContext *asf = s->priv_data;
633     uint32_t packet_length, padsize;
634     int rsize = 8;
635     int c, d, e, off;
636
637     // if we do not know packet size, allow skipping up to 32 kB
638     off= 32768;
639     if (s->packet_size > 0)
640         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
641
642     c=d=e=-1;
643     while(off-- > 0){
644         c=d; d=e;
645         e= get_byte(pb);
646         if(c == 0x82 && !d && !e)
647             break;
648     }
649
650     if (c != 0x82) {
651         /**
652          * This code allows handling of -EAGAIN at packet boundaries (i.e.
653          * if the packet sync code above triggers -EAGAIN). This does not
654          * imply complete -EAGAIN handling support at random positions in
655          * the stream.
656          */
657         if (url_ferror(pb) == AVERROR(EAGAIN))
658             return AVERROR(EAGAIN);
659         if (!url_feof(pb))
660             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
661     }
662     if ((c & 0x8f) == 0x82) {
663         if (d || e) {
664             if (!url_feof(pb))
665                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
666             return -1;
667         }
668         c= get_byte(pb);
669         d= get_byte(pb);
670         rsize+=3;
671     }else{
672         url_fseek(pb, -1, SEEK_CUR); //FIXME
673     }
674
675     asf->packet_flags    = c;
676     asf->packet_property = d;
677
678     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
679     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
680     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
681
682     //the following checks prevent overflows and infinite loops
683     if(!packet_length || packet_length >= (1U<<29)){
684         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
685         return -1;
686     }
687     if(padsize >= packet_length){
688         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
689         return -1;
690     }
691
692     asf->packet_timestamp = get_le32(pb);
693     get_le16(pb); /* duration */
694     // rsize has at least 11 bytes which have to be present
695
696     if (asf->packet_flags & 0x01) {
697         asf->packet_segsizetype = get_byte(pb); rsize++;
698         asf->packet_segments = asf->packet_segsizetype & 0x3f;
699     } else {
700         asf->packet_segments = 1;
701         asf->packet_segsizetype = 0x80;
702     }
703     asf->packet_size_left = packet_length - padsize - rsize;
704     if (packet_length < asf->hdr.min_pktsize)
705         padsize += asf->hdr.min_pktsize - packet_length;
706     asf->packet_padsize = padsize;
707     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
708     return 0;
709 }
710
711 /**
712  *
713  * @return <0 if error
714  */
715 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
716     ASFContext *asf = s->priv_data;
717     int rsize = 1;
718     int num = get_byte(pb);
719     int64_t ts0, ts1;
720
721     asf->packet_segments--;
722     asf->packet_key_frame = num >> 7;
723     asf->stream_index = asf->asfid2avid[num & 0x7f];
724     // sequence should be ignored!
725     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
726     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
727     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
728 //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);
729     if (asf->packet_replic_size >= 8) {
730         asf->packet_obj_size = get_le32(pb);
731         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
732             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
733             return -1;
734         }
735         asf->packet_frag_timestamp = get_le32(pb); // timestamp
736         if(asf->packet_replic_size >= 8+38+4){
737 //            for(i=0; i<asf->packet_replic_size-8; i++)
738 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
739 //            av_log(s, AV_LOG_DEBUG, "\n");
740             url_fskip(pb, 10);
741             ts0= get_le64(pb);
742             ts1= get_le64(pb);
743             url_fskip(pb, 12);
744             get_le32(pb);
745             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
746             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
747             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
748         }else
749             url_fskip(pb, asf->packet_replic_size - 8);
750         rsize += asf->packet_replic_size; // FIXME - check validity
751     } else if (asf->packet_replic_size==1){
752         // multipacket - frag_offset is beginning timestamp
753         asf->packet_time_start = asf->packet_frag_offset;
754         asf->packet_frag_offset = 0;
755         asf->packet_frag_timestamp = asf->packet_timestamp;
756
757         asf->packet_time_delta = get_byte(pb);
758         rsize++;
759     }else if(asf->packet_replic_size!=0){
760         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
761         return -1;
762     }
763     if (asf->packet_flags & 0x01) {
764         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
765         if(asf->packet_frag_size > asf->packet_size_left - rsize){
766             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
767             return -1;
768         }
769         //printf("Fragsize %d\n", asf->packet_frag_size);
770     } else {
771         asf->packet_frag_size = asf->packet_size_left - rsize;
772         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
773     }
774     if (asf->packet_replic_size == 1) {
775         asf->packet_multi_size = asf->packet_frag_size;
776         if (asf->packet_multi_size > asf->packet_size_left)
777             return -1;
778     }
779     asf->packet_size_left -= rsize;
780     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
781
782     return 0;
783 }
784
785 /**
786  * Parse data from individual ASF packets (which were previously loaded
787  * with asf_get_packet()).
788  * @param s demux context
789  * @param pb context to read data from
790  * @param pkt pointer to store packet data into
791  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
792  *          packets need to be loaded (through asf_get_packet())
793  */
794 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
795 {
796     ASFContext *asf = s->priv_data;
797     ASFStream *asf_st = 0;
798     for (;;) {
799         int ret;
800         if(url_feof(pb))
801             return AVERROR_EOF;
802         if (asf->packet_size_left < FRAME_HEADER_SIZE
803             || asf->packet_segments < 1) {
804             //asf->packet_size_left <= asf->packet_padsize) {
805             int ret = asf->packet_size_left + asf->packet_padsize;
806             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
807             assert(ret>=0);
808             /* fail safe */
809             url_fskip(pb, ret);
810
811             asf->packet_pos= url_ftell(pb);
812             if (asf->data_object_size != (uint64_t)-1 &&
813                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
814                 return AVERROR_EOF; /* Do not exceed the size of the data object */
815             return 1;
816         }
817         if (asf->packet_time_start == 0) {
818             if(asf_read_frame_header(s, pb) < 0){
819                 asf->packet_segments= 0;
820                 continue;
821             }
822             if (asf->stream_index < 0
823                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
824                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
825                 ) {
826                 asf->packet_time_start = 0;
827                 /* unhandled packet (should not happen) */
828                 url_fskip(pb, asf->packet_frag_size);
829                 asf->packet_size_left -= asf->packet_frag_size;
830                 if(asf->stream_index < 0)
831                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
832                 continue;
833             }
834             asf->asf_st = s->streams[asf->stream_index]->priv_data;
835         }
836         asf_st = asf->asf_st;
837
838         if (asf->packet_replic_size == 1) {
839             // frag_offset is here used as the beginning timestamp
840             asf->packet_frag_timestamp = asf->packet_time_start;
841             asf->packet_time_start += asf->packet_time_delta;
842             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
843             asf->packet_size_left--;
844             asf->packet_multi_size--;
845             if (asf->packet_multi_size < asf->packet_obj_size)
846             {
847                 asf->packet_time_start = 0;
848                 url_fskip(pb, asf->packet_multi_size);
849                 asf->packet_size_left -= asf->packet_multi_size;
850                 continue;
851             }
852             asf->packet_multi_size -= asf->packet_obj_size;
853             //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);
854         }
855         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
856               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
857            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
858             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
859                 asf_st->frag_offset, asf->packet_frag_size,
860                 asf->packet_obj_size, asf_st->pkt.size);
861             asf->packet_obj_size= asf_st->pkt.size;
862         }
863
864         if (   asf_st->pkt.size != asf->packet_obj_size
865             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
866             if(asf_st->pkt.data){
867                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
868                 asf_st->frag_offset = 0;
869                 av_free_packet(&asf_st->pkt);
870             }
871             /* new packet */
872             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
873             asf_st->seq = asf->packet_seq;
874             asf_st->pkt.dts = asf->packet_frag_timestamp;
875             asf_st->pkt.stream_index = asf->stream_index;
876             asf_st->pkt.pos =
877             asf_st->packet_pos= asf->packet_pos;
878 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
879 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
880 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
881             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
882                 asf->packet_key_frame = 1;
883             if (asf->packet_key_frame)
884                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
885         }
886
887         /* read data */
888         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
889         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
890         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
891         asf->packet_size_left -= asf->packet_frag_size;
892         if (asf->packet_size_left < 0)
893             continue;
894
895         if(   asf->packet_frag_offset >= asf_st->pkt.size
896            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
897             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
898                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
899             continue;
900         }
901
902         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
903                          asf->packet_frag_size);
904         if (ret != asf->packet_frag_size) {
905             if (ret < 0 || asf->packet_frag_offset + ret == 0)
906                 return ret < 0 ? ret : AVERROR_EOF;
907             if (asf_st->ds_span > 1) {
908                 // scrambling, we can either drop it completely or fill the remainder
909                 // TODO: should we fill the whole packet instead of just the current
910                 // fragment?
911                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
912                        asf->packet_frag_size - ret);
913                 ret = asf->packet_frag_size;
914             } else
915                 // no scrambling, so we can return partial packets
916                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
917         }
918         if (s->key && s->keylen == 20)
919             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
920                             ret);
921         asf_st->frag_offset += ret;
922         /* test if whole packet is read */
923         if (asf_st->frag_offset == asf_st->pkt.size) {
924             //workaround for macroshit radio DVR-MS files
925             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
926                && asf_st->pkt.size > 100){
927                 int i;
928                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
929                 if(i == asf_st->pkt.size){
930                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
931                     asf_st->frag_offset = 0;
932                     av_free_packet(&asf_st->pkt);
933                     continue;
934                 }
935             }
936
937             /* return packet */
938             if (asf_st->ds_span > 1) {
939               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
940                     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);
941               }else{
942                 /* packet descrambling */
943                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
944                 if (newdata) {
945                     int offset = 0;
946                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
947                     while (offset < asf_st->pkt.size) {
948                         int off = offset / asf_st->ds_chunk_size;
949                         int row = off / asf_st->ds_span;
950                         int col = off % asf_st->ds_span;
951                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
952                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
953
954                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
955                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
956                         memcpy(newdata + offset,
957                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
958                                asf_st->ds_chunk_size);
959                         offset += asf_st->ds_chunk_size;
960                     }
961                     av_free(asf_st->pkt.data);
962                     asf_st->pkt.data = newdata;
963                 }
964               }
965             }
966             asf_st->frag_offset = 0;
967             *pkt= asf_st->pkt;
968             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
969             asf_st->pkt.size = 0;
970             asf_st->pkt.data = 0;
971             break; // packet completed
972         }
973     }
974     return 0;
975 }
976
977 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
978 {
979     ASFContext *asf = s->priv_data;
980
981     for (;;) {
982         int ret;
983
984         /* parse cached packets, if any */
985         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
986             return ret;
987         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
988             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
989         asf->packet_time_start = 0;
990     }
991
992     return 0;
993 }
994
995 // Added to support seeking after packets have been read
996 // If information is not reset, read_packet fails due to
997 // leftover information from previous reads
998 static void asf_reset_header(AVFormatContext *s)
999 {
1000     ASFContext *asf = s->priv_data;
1001     ASFStream *asf_st;
1002     int i;
1003
1004     asf->packet_nb_frames = 0;
1005     asf->packet_size_left = 0;
1006     asf->packet_segments = 0;
1007     asf->packet_flags = 0;
1008     asf->packet_property = 0;
1009     asf->packet_timestamp = 0;
1010     asf->packet_segsizetype = 0;
1011     asf->packet_segments = 0;
1012     asf->packet_seq = 0;
1013     asf->packet_replic_size = 0;
1014     asf->packet_key_frame = 0;
1015     asf->packet_padsize = 0;
1016     asf->packet_frag_offset = 0;
1017     asf->packet_frag_size = 0;
1018     asf->packet_frag_timestamp = 0;
1019     asf->packet_multi_size = 0;
1020     asf->packet_obj_size = 0;
1021     asf->packet_time_delta = 0;
1022     asf->packet_time_start = 0;
1023
1024     for(i=0; i<s->nb_streams; i++){
1025         asf_st= s->streams[i]->priv_data;
1026         av_free_packet(&asf_st->pkt);
1027         asf_st->frag_offset=0;
1028         asf_st->seq=0;
1029     }
1030     asf->asf_st= NULL;
1031 }
1032
1033 static int asf_read_close(AVFormatContext *s)
1034 {
1035     int i;
1036
1037     asf_reset_header(s);
1038     for(i=0;i<s->nb_streams;i++) {
1039         AVStream *st = s->streams[i];
1040         av_free(st->codec->palctrl);
1041     }
1042     return 0;
1043 }
1044
1045 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1046 {
1047     AVPacket pkt1, *pkt = &pkt1;
1048     ASFStream *asf_st;
1049     int64_t pts;
1050     int64_t pos= *ppos;
1051     int i;
1052     int64_t start_pos[ASF_MAX_STREAMS];
1053
1054     for(i=0; i<s->nb_streams; i++){
1055         start_pos[i]= pos;
1056     }
1057
1058     if (s->packet_size > 0)
1059         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1060     *ppos= pos;
1061     url_fseek(s->pb, pos, SEEK_SET);
1062
1063 //printf("asf_read_pts\n");
1064     asf_reset_header(s);
1065     for(;;){
1066         if (av_read_frame(s, pkt) < 0){
1067             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1068             return AV_NOPTS_VALUE;
1069         }
1070
1071         pts= pkt->pts;
1072
1073         av_free_packet(pkt);
1074         if(pkt->flags&AV_PKT_FLAG_KEY){
1075             i= pkt->stream_index;
1076
1077             asf_st= s->streams[i]->priv_data;
1078
1079 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1080             pos= asf_st->packet_pos;
1081
1082             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1083             start_pos[i]= asf_st->packet_pos + 1;
1084
1085             if(pkt->stream_index == stream_index)
1086                break;
1087         }
1088     }
1089
1090     *ppos= pos;
1091 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1092
1093     return pts;
1094 }
1095
1096 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1097 {
1098     ff_asf_guid g;
1099     ASFContext *asf = s->priv_data;
1100     int64_t current_pos= url_ftell(s->pb);
1101     int i;
1102
1103     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1104     ff_get_guid(s->pb, &g);
1105
1106     /* the data object can be followed by other top-level objects,
1107        skip them until the simple index object is reached */
1108     while (ff_guidcmp(&g, &index_guid)) {
1109         int64_t gsize= get_le64(s->pb);
1110         if (gsize < 24 || url_feof(s->pb)) {
1111             url_fseek(s->pb, current_pos, SEEK_SET);
1112             return;
1113         }
1114         url_fseek(s->pb, gsize-24, SEEK_CUR);
1115         ff_get_guid(s->pb, &g);
1116     }
1117
1118     {
1119         int64_t itime, last_pos=-1;
1120         int pct, ict;
1121         int64_t av_unused gsize= get_le64(s->pb);
1122         ff_get_guid(s->pb, &g);
1123         itime=get_le64(s->pb);
1124         pct=get_le32(s->pb);
1125         ict=get_le32(s->pb);
1126         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1127
1128         for (i=0;i<ict;i++){
1129             int pktnum=get_le32(s->pb);
1130             int pktct =get_le16(s->pb);
1131             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1132             int64_t index_pts= av_rescale(itime, i, 10000);
1133
1134             if(pos != last_pos){
1135             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1136             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1137             last_pos=pos;
1138             }
1139         }
1140         asf->index_read= 1;
1141     }
1142     url_fseek(s->pb, current_pos, SEEK_SET);
1143 }
1144
1145 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1146 {
1147     ASFContext *asf = s->priv_data;
1148     AVStream *st = s->streams[stream_index];
1149     int64_t pos;
1150     int index;
1151
1152     if (s->packet_size <= 0)
1153         return -1;
1154
1155     /* Try using the protocol's read_seek if available */
1156     if(s->pb) {
1157         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1158         if(ret >= 0)
1159             asf_reset_header(s);
1160         if (ret != AVERROR(ENOSYS))
1161             return ret;
1162     }
1163
1164     if (!asf->index_read)
1165         asf_build_simple_index(s, stream_index);
1166
1167     if(!(asf->index_read && st->index_entries)){
1168         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1169             return -1;
1170     }else{
1171         index= av_index_search_timestamp(st, pts, flags);
1172         if(index<0)
1173             return -1;
1174
1175         /* find the position */
1176         pos = st->index_entries[index].pos;
1177
1178     // various attempts to find key frame have failed so far
1179     //    asf_reset_header(s);
1180     //    url_fseek(s->pb, pos, SEEK_SET);
1181     //    key_pos = pos;
1182     //     for(i=0;i<16;i++){
1183     //         pos = url_ftell(s->pb);
1184     //         if (av_read_frame(s, &pkt) < 0){
1185     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1186     //             return -1;
1187     //         }
1188     //         asf_st = s->streams[stream_index]->priv_data;
1189     //         pos += st->parser->frame_offset;
1190     //
1191     //         if (pkt.size > b) {
1192     //             b = pkt.size;
1193     //             key_pos = pos;
1194     //         }
1195     //
1196     //         av_free_packet(&pkt);
1197     //     }
1198
1199         /* do the seek */
1200         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1201         url_fseek(s->pb, pos, SEEK_SET);
1202     }
1203     asf_reset_header(s);
1204     return 0;
1205 }
1206
1207 AVInputFormat ff_asf_demuxer = {
1208     "asf",
1209     NULL_IF_CONFIG_SMALL("ASF format"),
1210     sizeof(ASFContext),
1211     asf_probe,
1212     asf_read_header,
1213     asf_read_packet,
1214     asf_read_close,
1215     asf_read_seek,
1216     asf_read_pts,
1217 };