asf: make ff_guidcmp inline and move it to asf.h
[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 #ifdef DEBUG
53 #define PRINT_IF_GUID(g,cmp) \
54 if (!ff_guidcmp(g, &cmp)) \
55     av_dlog(NULL, "(GUID: %s) ", #cmp)
56
57 static void print_guid(const ff_asf_guid *g)
58 {
59     int i;
60     PRINT_IF_GUID(g, ff_asf_header);
61     else PRINT_IF_GUID(g, ff_asf_file_header);
62     else PRINT_IF_GUID(g, ff_asf_stream_header);
63     else PRINT_IF_GUID(g, ff_asf_audio_stream);
64     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
65     else PRINT_IF_GUID(g, ff_asf_video_stream);
66     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
67     else PRINT_IF_GUID(g, ff_asf_command_stream);
68     else PRINT_IF_GUID(g, ff_asf_comment_header);
69     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
70     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
71     else PRINT_IF_GUID(g, ff_asf_data_header);
72     else PRINT_IF_GUID(g, index_guid);
73     else PRINT_IF_GUID(g, ff_asf_head1_guid);
74     else PRINT_IF_GUID(g, ff_asf_head2_guid);
75     else PRINT_IF_GUID(g, ff_asf_my_guid);
76     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
77     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
78     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
79     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
80     else PRINT_IF_GUID(g, ff_asf_metadata_header);
81     else PRINT_IF_GUID(g, ff_asf_marker_header);
82     else PRINT_IF_GUID(g, stream_bitrate_guid);
83     else PRINT_IF_GUID(g, ff_asf_language_guid);
84     else
85         av_dlog(NULL, "(GUID: unknown) ");
86     for(i=0;i<16;i++)
87         av_dlog(NULL, " 0x%02x,", (*g)[i]);
88     av_dlog(NULL, "}\n");
89 }
90 #undef PRINT_IF_GUID
91 #else
92 #define print_guid(g)
93 #endif
94
95 void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
96 {
97     assert(sizeof(*g) == 16);
98     get_buffer(s, *g, sizeof(*g));
99 }
100
101 static int asf_probe(AVProbeData *pd)
102 {
103     /* check file header */
104     if (!ff_guidcmp(pd->buf, &ff_asf_header))
105         return AVPROBE_SCORE_MAX;
106     else
107         return 0;
108 }
109
110 static int get_value(ByteIOContext *pb, int type){
111     switch(type){
112         case 2: return get_le32(pb);
113         case 3: return get_le32(pb);
114         case 4: return get_le64(pb);
115         case 5: return get_le16(pb);
116         default:return INT_MIN;
117     }
118 }
119
120 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
121 {
122     char *value;
123     int64_t off = url_ftell(s->pb);
124
125     if ((unsigned)len >= (UINT_MAX - 1)/2)
126         return;
127
128     value = av_malloc(2*len+1);
129     if (!value)
130         goto finish;
131
132     if (type == 0) {         // UTF16-LE
133         avio_get_str16le(s->pb, len, value, 2*len + 1);
134     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
135         uint64_t num = get_value(s->pb, type);
136         snprintf(value, len, "%"PRIu64, num);
137     } else {
138         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
139         goto finish;
140     }
141     av_metadata_set2(&s->metadata, key, value, 0);
142 finish:
143     av_freep(&value);
144     url_fseek(s->pb, off + len, SEEK_SET);
145 }
146
147 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
148 {
149     ASFContext *asf = s->priv_data;
150     ff_asf_guid g;
151     ByteIOContext *pb = s->pb;
152     AVStream *st;
153     ASFStream *asf_st;
154     int size, i;
155     int64_t gsize;
156     AVRational dar[128];
157     uint32_t bitrate[128];
158
159     memset(dar, 0, sizeof(dar));
160     memset(bitrate, 0, sizeof(bitrate));
161
162     ff_get_guid(pb, &g);
163     if (ff_guidcmp(&g, &ff_asf_header))
164         return -1;
165     get_le64(pb);
166     get_le32(pb);
167     get_byte(pb);
168     get_byte(pb);
169     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
170     for(;;) {
171         uint64_t gpos= url_ftell(pb);
172         int ret;
173         ff_get_guid(pb, &g);
174         gsize = get_le64(pb);
175         av_dlog(s, "%08"PRIx64": ", gpos);
176         print_guid(&g);
177         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
178         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
179             asf->data_object_offset = url_ftell(pb);
180             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
181             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
182                 asf->data_object_size = gsize - 24;
183             } else {
184                 asf->data_object_size = (uint64_t)-1;
185             }
186             break;
187         }
188         if (gsize < 24)
189             return -1;
190         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
191             ff_get_guid(pb, &asf->hdr.guid);
192             asf->hdr.file_size          = get_le64(pb);
193             asf->hdr.create_time        = get_le64(pb);
194             asf->nb_packets             = get_le64(pb);
195             asf->hdr.play_time          = get_le64(pb);
196             asf->hdr.send_time          = get_le64(pb);
197             asf->hdr.preroll            = get_le32(pb);
198             asf->hdr.ignore             = get_le32(pb);
199             asf->hdr.flags              = get_le32(pb);
200             asf->hdr.min_pktsize        = get_le32(pb);
201             asf->hdr.max_pktsize        = get_le32(pb);
202             asf->hdr.max_bitrate        = get_le32(pb);
203             s->packet_size = asf->hdr.max_pktsize;
204         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
205             enum AVMediaType type;
206             int type_specific_size, sizeX;
207             uint64_t total_size;
208             unsigned int tag1;
209             int64_t pos1, pos2, start_time;
210             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
211
212             if (s->nb_streams == ASF_MAX_STREAMS) {
213                 av_log(s, AV_LOG_ERROR, "too many streams\n");
214                 return AVERROR(EINVAL);
215             }
216
217             pos1 = url_ftell(pb);
218
219             st = av_new_stream(s, 0);
220             if (!st)
221                 return AVERROR(ENOMEM);
222             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
223             asf_st = av_mallocz(sizeof(ASFStream));
224             if (!asf_st)
225                 return AVERROR(ENOMEM);
226             st->priv_data = asf_st;
227             start_time = asf->hdr.preroll;
228
229             asf_st->stream_language_index = 128; // invalid stream index means no language info
230
231             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
232                 st->duration = asf->hdr.play_time /
233                     (10000000 / 1000) - start_time;
234             }
235             ff_get_guid(pb, &g);
236
237             test_for_ext_stream_audio = 0;
238             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
239                 type = AVMEDIA_TYPE_AUDIO;
240             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
241                 type = AVMEDIA_TYPE_VIDEO;
242             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
243                 type = AVMEDIA_TYPE_VIDEO;
244                 st->codec->codec_id = CODEC_ID_MJPEG;
245             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
246                 type = AVMEDIA_TYPE_DATA;
247             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
248                 test_for_ext_stream_audio = 1;
249                 type = AVMEDIA_TYPE_UNKNOWN;
250             } else {
251                 return -1;
252             }
253             ff_get_guid(pb, &g);
254             total_size = get_le64(pb);
255             type_specific_size = get_le32(pb);
256             get_le32(pb);
257             st->id = get_le16(pb) & 0x7f; /* stream id */
258             // mapping of asf ID to AV stream ID;
259             asf->asfid2avid[st->id] = s->nb_streams - 1;
260
261             get_le32(pb);
262
263             if (test_for_ext_stream_audio) {
264                 ff_get_guid(pb, &g);
265                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
266                     type = AVMEDIA_TYPE_AUDIO;
267                     is_dvr_ms_audio=1;
268                     ff_get_guid(pb, &g);
269                     get_le32(pb);
270                     get_le32(pb);
271                     get_le32(pb);
272                     ff_get_guid(pb, &g);
273                     get_le32(pb);
274                 }
275             }
276
277             st->codec->codec_type = type;
278             if (type == AVMEDIA_TYPE_AUDIO) {
279                 ff_get_wav_header(pb, st->codec, type_specific_size);
280                 if (is_dvr_ms_audio) {
281                     // codec_id and codec_tag are unreliable in dvr_ms
282                     // files. Set them later by probing stream.
283                     st->codec->codec_id = CODEC_ID_PROBE;
284                     st->codec->codec_tag = 0;
285                 }
286                 if (st->codec->codec_id == CODEC_ID_AAC) {
287                     st->need_parsing = AVSTREAM_PARSE_NONE;
288                 } else {
289                     st->need_parsing = AVSTREAM_PARSE_FULL;
290                 }
291                 /* We have to init the frame size at some point .... */
292                 pos2 = url_ftell(pb);
293                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
294                     asf_st->ds_span = get_byte(pb);
295                     asf_st->ds_packet_size = get_le16(pb);
296                     asf_st->ds_chunk_size = get_le16(pb);
297                     get_le16(pb); //ds_data_size
298                     get_byte(pb); //ds_silence_data
299                 }
300                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
301                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
302                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
303                 if (asf_st->ds_span > 1) {
304                     if (!asf_st->ds_chunk_size
305                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
306                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
307                         asf_st->ds_span = 0; // disable descrambling
308                 }
309                 switch (st->codec->codec_id) {
310                 case CODEC_ID_MP3:
311                     st->codec->frame_size = MPA_FRAME_SIZE;
312                     break;
313                 case CODEC_ID_PCM_S16LE:
314                 case CODEC_ID_PCM_S16BE:
315                 case CODEC_ID_PCM_U16LE:
316                 case CODEC_ID_PCM_U16BE:
317                 case CODEC_ID_PCM_S8:
318                 case CODEC_ID_PCM_U8:
319                 case CODEC_ID_PCM_ALAW:
320                 case CODEC_ID_PCM_MULAW:
321                     st->codec->frame_size = 1;
322                     break;
323                 default:
324                     /* This is probably wrong, but it prevents a crash later */
325                     st->codec->frame_size = 1;
326                     break;
327                 }
328             } else if (type == AVMEDIA_TYPE_VIDEO &&
329                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
330                 get_le32(pb);
331                 get_le32(pb);
332                 get_byte(pb);
333                 size = get_le16(pb); /* size */
334                 sizeX= get_le32(pb); /* size */
335                 st->codec->width = get_le32(pb);
336                 st->codec->height = get_le32(pb);
337                 /* not available for asf */
338                 get_le16(pb); /* panes */
339                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
340                 tag1 = get_le32(pb);
341                 url_fskip(pb, 20);
342 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
343                 size= sizeX;
344                 if (size > 40) {
345                     st->codec->extradata_size = size - 40;
346                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
347                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
348                 }
349
350                 /* Extract palette from extradata if bpp <= 8 */
351                 /* This code assumes that extradata contains only palette */
352                 /* This is true for all paletted codecs implemented in ffmpeg */
353                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
354                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
355 #if HAVE_BIGENDIAN
356                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
357                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
358 #else
359                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
360                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
361 #endif
362                     st->codec->palctrl->palette_changed = 1;
363                 }
364
365                 st->codec->codec_tag = tag1;
366                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
367                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
368                     st->need_parsing = AVSTREAM_PARSE_FULL;
369                     // 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
370                     st->codec->width  =
371                     st->codec->height = 0;
372                     av_freep(&st->codec->extradata);
373                     st->codec->extradata_size=0;
374                 }
375                 if(st->codec->codec_id == CODEC_ID_H264)
376                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
377             }
378             pos2 = url_ftell(pb);
379             url_fskip(pb, gsize - (pos2 - pos1 + 24));
380         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
381             int len1, len2, len3, len4, len5;
382
383             len1 = get_le16(pb);
384             len2 = get_le16(pb);
385             len3 = get_le16(pb);
386             len4 = get_le16(pb);
387             len5 = get_le16(pb);
388             get_tag(s, "title"    , 0, len1);
389             get_tag(s, "author"   , 0, len2);
390             get_tag(s, "copyright", 0, len3);
391             get_tag(s, "comment"  , 0, len4);
392             url_fskip(pb, len5);
393         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
394             int stream_count = get_le16(pb);
395             int j;
396
397 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
398 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
399             for(j = 0; j < stream_count; j++) {
400                 int flags, bitrate, stream_id;
401
402                 flags= get_le16(pb);
403                 bitrate= get_le32(pb);
404                 stream_id= (flags & 0x7f);
405 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
406                 asf->stream_bitrates[stream_id]= bitrate;
407             }
408         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
409             int j;
410             int stream_count = get_le16(pb);
411             for(j = 0; j < stream_count; j++) {
412                 char lang[6];
413                 unsigned int lang_len = get_byte(pb);
414                 if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
415                     url_fskip(pb, lang_len - ret);
416                 if (j < 128)
417                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
418             }
419         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
420             int desc_count, i;
421
422             desc_count = get_le16(pb);
423             for(i=0;i<desc_count;i++) {
424                     int name_len,value_type,value_len;
425                     char name[1024];
426
427                     name_len = get_le16(pb);
428                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
429                         name_len += 1;
430                     if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
431                         url_fskip(pb, name_len - ret);
432                     value_type = get_le16(pb);
433                     value_len  = get_le16(pb);
434                     if (!value_type && value_len%2)
435                         value_len += 1;
436                     /**
437                      * My sample has that stream set to 0 maybe that mean the container.
438                      * Asf stream count start at 1. I am using 0 to the container value since it's unused
439                      */
440                     if (!strcmp(name, "AspectRatioX")){
441                         dar[0].num= get_value(s->pb, value_type);
442                     } else if(!strcmp(name, "AspectRatioY")){
443                         dar[0].den= get_value(s->pb, value_type);
444                     } else
445                         get_tag(s, name, value_type, value_len);
446             }
447         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
448             int n, stream_num, name_len, value_len, value_type, value_num;
449             n = get_le16(pb);
450
451             for(i=0;i<n;i++) {
452                 char name[1024];
453
454                 get_le16(pb); //lang_list_index
455                 stream_num= get_le16(pb);
456                 name_len=   get_le16(pb);
457                 value_type= get_le16(pb);
458                 value_len=  get_le32(pb);
459
460                 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
461                     url_fskip(pb, name_len - ret);
462 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
463                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
464                 url_fskip(pb, value_len - 2);
465
466                 if(stream_num<128){
467                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
468                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
469                 }
470             }
471         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
472             int ext_len, payload_ext_ct, stream_ct;
473             uint32_t ext_d, leak_rate, stream_num;
474             unsigned int stream_languageid_index;
475
476             get_le64(pb); // starttime
477             get_le64(pb); // endtime
478             leak_rate = get_le32(pb); // leak-datarate
479             get_le32(pb); // bucket-datasize
480             get_le32(pb); // init-bucket-fullness
481             get_le32(pb); // alt-leak-datarate
482             get_le32(pb); // alt-bucket-datasize
483             get_le32(pb); // alt-init-bucket-fullness
484             get_le32(pb); // max-object-size
485             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
486             stream_num = get_le16(pb); // stream-num
487
488             stream_languageid_index = get_le16(pb); // stream-language-id-index
489             if (stream_num < 128)
490                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
491
492             get_le64(pb); // avg frametime in 100ns units
493             stream_ct = get_le16(pb); //stream-name-count
494             payload_ext_ct = get_le16(pb); //payload-extension-system-count
495
496             if (stream_num < 128)
497                 bitrate[stream_num] = leak_rate;
498
499             for (i=0; i<stream_ct; i++){
500                 get_le16(pb);
501                 ext_len = get_le16(pb);
502                 url_fseek(pb, ext_len, SEEK_CUR);
503             }
504
505             for (i=0; i<payload_ext_ct; i++){
506                 ff_get_guid(pb, &g);
507                 ext_d=get_le16(pb);
508                 ext_len=get_le32(pb);
509                 url_fseek(pb, ext_len, SEEK_CUR);
510             }
511
512             // there could be a optional stream properties object to follow
513             // if so the next iteration will pick it up
514             continue;
515         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
516             int v1, v2;
517             ff_get_guid(pb, &g);
518             v1 = get_le32(pb);
519             v2 = get_le16(pb);
520             continue;
521         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
522             int i, count, name_len;
523             char name[1024];
524
525             get_le64(pb);            // reserved 16 bytes
526             get_le64(pb);            // ...
527             count = get_le32(pb);    // markers count
528             get_le16(pb);            // reserved 2 bytes
529             name_len = get_le16(pb); // name length
530             for(i=0;i<name_len;i++){
531                 get_byte(pb); // skip the name
532             }
533
534             for(i=0;i<count;i++){
535                 int64_t pres_time;
536                 int name_len;
537
538                 get_le64(pb);             // offset, 8 bytes
539                 pres_time = get_le64(pb); // presentation time
540                 get_le16(pb);             // entry length
541                 get_le32(pb);             // send time
542                 get_le32(pb);             // flags
543                 name_len = get_le32(pb);  // name length
544                 if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
545                     url_fskip(pb, name_len - ret);
546                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
547             }
548         } else if (url_feof(pb)) {
549             return -1;
550         } else {
551             if (!s->keylen) {
552                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
553                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
554                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
555                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
556                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
557                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
558                 }
559             }
560         }
561         if(url_ftell(pb) != gpos + gsize)
562             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
563         url_fseek(pb, gpos + gsize, SEEK_SET);
564     }
565     ff_get_guid(pb, &g);
566     get_le64(pb);
567     get_byte(pb);
568     get_byte(pb);
569     if (url_feof(pb))
570         return -1;
571     asf->data_offset = url_ftell(pb);
572     asf->packet_size_left = 0;
573
574
575     for(i=0; i<128; i++){
576         int stream_num= asf->asfid2avid[i];
577         if(stream_num>=0){
578             AVStream *st = s->streams[stream_num];
579             if (!st->codec->bit_rate)
580                 st->codec->bit_rate = bitrate[i];
581             if (dar[i].num > 0 && dar[i].den > 0){
582                 av_reduce(&st->sample_aspect_ratio.num,
583                           &st->sample_aspect_ratio.den,
584                           dar[i].num, dar[i].den, INT_MAX);
585             } 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.
586                 av_reduce(&st->sample_aspect_ratio.num,
587                           &st->sample_aspect_ratio.den,
588                           dar[0].num, dar[0].den, INT_MAX);
589
590 //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);
591
592             // copy and convert language codes to the frontend
593             if (asf->streams[i].stream_language_index < 128) {
594                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
595                 if (rfc1766 && strlen(rfc1766) > 1) {
596                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
597                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
598                     if (iso6392)
599                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
600                 }
601             }
602         }
603     }
604
605     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
606
607     return 0;
608 }
609
610 #define DO_2BITS(bits, var, defval) \
611     switch (bits & 3) \
612     { \
613     case 3: var = get_le32(pb); rsize += 4; break; \
614     case 2: var = get_le16(pb); rsize += 2; break; \
615     case 1: var = get_byte(pb); rsize++; break; \
616     default: var = defval; break; \
617     }
618
619 /**
620  * Load a single ASF packet into the demuxer.
621  * @param s demux context
622  * @param pb context to read data from
623  * @return 0 on success, <0 on error
624  */
625 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
626 {
627     ASFContext *asf = s->priv_data;
628     uint32_t packet_length, padsize;
629     int rsize = 8;
630     int c, d, e, off;
631
632     // if we do not know packet size, allow skipping up to 32 kB
633     off= 32768;
634     if (s->packet_size > 0)
635         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
636
637     c=d=e=-1;
638     while(off-- > 0){
639         c=d; d=e;
640         e= get_byte(pb);
641         if(c == 0x82 && !d && !e)
642             break;
643     }
644
645     if (c != 0x82) {
646         /**
647          * This code allows handling of -EAGAIN at packet boundaries (i.e.
648          * if the packet sync code above triggers -EAGAIN). This does not
649          * imply complete -EAGAIN handling support at random positions in
650          * the stream.
651          */
652         if (url_ferror(pb) == AVERROR(EAGAIN))
653             return AVERROR(EAGAIN);
654         if (!url_feof(pb))
655             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
656     }
657     if ((c & 0x8f) == 0x82) {
658         if (d || e) {
659             if (!url_feof(pb))
660                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
661             return -1;
662         }
663         c= get_byte(pb);
664         d= get_byte(pb);
665         rsize+=3;
666     }else{
667         url_fseek(pb, -1, SEEK_CUR); //FIXME
668     }
669
670     asf->packet_flags    = c;
671     asf->packet_property = d;
672
673     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
674     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
675     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
676
677     //the following checks prevent overflows and infinite loops
678     if(!packet_length || packet_length >= (1U<<29)){
679         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
680         return -1;
681     }
682     if(padsize >= packet_length){
683         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
684         return -1;
685     }
686
687     asf->packet_timestamp = get_le32(pb);
688     get_le16(pb); /* duration */
689     // rsize has at least 11 bytes which have to be present
690
691     if (asf->packet_flags & 0x01) {
692         asf->packet_segsizetype = get_byte(pb); rsize++;
693         asf->packet_segments = asf->packet_segsizetype & 0x3f;
694     } else {
695         asf->packet_segments = 1;
696         asf->packet_segsizetype = 0x80;
697     }
698     asf->packet_size_left = packet_length - padsize - rsize;
699     if (packet_length < asf->hdr.min_pktsize)
700         padsize += asf->hdr.min_pktsize - packet_length;
701     asf->packet_padsize = padsize;
702     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
703     return 0;
704 }
705
706 /**
707  *
708  * @return <0 if error
709  */
710 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
711     ASFContext *asf = s->priv_data;
712     int rsize = 1;
713     int num = get_byte(pb);
714     int64_t ts0, ts1;
715
716     asf->packet_segments--;
717     asf->packet_key_frame = num >> 7;
718     asf->stream_index = asf->asfid2avid[num & 0x7f];
719     // sequence should be ignored!
720     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
721     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
722     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
723 //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);
724     if (asf->packet_replic_size >= 8) {
725         asf->packet_obj_size = get_le32(pb);
726         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
727             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
728             return -1;
729         }
730         asf->packet_frag_timestamp = get_le32(pb); // timestamp
731         if(asf->packet_replic_size >= 8+38+4){
732 //            for(i=0; i<asf->packet_replic_size-8; i++)
733 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
734 //            av_log(s, AV_LOG_DEBUG, "\n");
735             url_fskip(pb, 10);
736             ts0= get_le64(pb);
737             ts1= get_le64(pb);
738             url_fskip(pb, 12);
739             get_le32(pb);
740             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
741             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
742             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
743         }else
744             url_fskip(pb, asf->packet_replic_size - 8);
745         rsize += asf->packet_replic_size; // FIXME - check validity
746     } else if (asf->packet_replic_size==1){
747         // multipacket - frag_offset is beginning timestamp
748         asf->packet_time_start = asf->packet_frag_offset;
749         asf->packet_frag_offset = 0;
750         asf->packet_frag_timestamp = asf->packet_timestamp;
751
752         asf->packet_time_delta = get_byte(pb);
753         rsize++;
754     }else if(asf->packet_replic_size!=0){
755         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
756         return -1;
757     }
758     if (asf->packet_flags & 0x01) {
759         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
760         if(asf->packet_frag_size > asf->packet_size_left - rsize){
761             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
762             return -1;
763         }
764         //printf("Fragsize %d\n", asf->packet_frag_size);
765     } else {
766         asf->packet_frag_size = asf->packet_size_left - rsize;
767         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
768     }
769     if (asf->packet_replic_size == 1) {
770         asf->packet_multi_size = asf->packet_frag_size;
771         if (asf->packet_multi_size > asf->packet_size_left)
772             return -1;
773     }
774     asf->packet_size_left -= rsize;
775     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
776
777     return 0;
778 }
779
780 /**
781  * Parse data from individual ASF packets (which were previously loaded
782  * with asf_get_packet()).
783  * @param s demux context
784  * @param pb context to read data from
785  * @param pkt pointer to store packet data into
786  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
787  *          packets need to be loaded (through asf_get_packet())
788  */
789 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
790 {
791     ASFContext *asf = s->priv_data;
792     ASFStream *asf_st = 0;
793     for (;;) {
794         int ret;
795         if(url_feof(pb))
796             return AVERROR_EOF;
797         if (asf->packet_size_left < FRAME_HEADER_SIZE
798             || asf->packet_segments < 1) {
799             //asf->packet_size_left <= asf->packet_padsize) {
800             int ret = asf->packet_size_left + asf->packet_padsize;
801             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
802             assert(ret>=0);
803             /* fail safe */
804             url_fskip(pb, ret);
805
806             asf->packet_pos= url_ftell(pb);
807             if (asf->data_object_size != (uint64_t)-1 &&
808                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
809                 return AVERROR_EOF; /* Do not exceed the size of the data object */
810             return 1;
811         }
812         if (asf->packet_time_start == 0) {
813             if(asf_read_frame_header(s, pb) < 0){
814                 asf->packet_segments= 0;
815                 continue;
816             }
817             if (asf->stream_index < 0
818                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
819                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
820                 ) {
821                 asf->packet_time_start = 0;
822                 /* unhandled packet (should not happen) */
823                 url_fskip(pb, asf->packet_frag_size);
824                 asf->packet_size_left -= asf->packet_frag_size;
825                 if(asf->stream_index < 0)
826                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
827                 continue;
828             }
829             asf->asf_st = s->streams[asf->stream_index]->priv_data;
830         }
831         asf_st = asf->asf_st;
832
833         if (asf->packet_replic_size == 1) {
834             // frag_offset is here used as the beginning timestamp
835             asf->packet_frag_timestamp = asf->packet_time_start;
836             asf->packet_time_start += asf->packet_time_delta;
837             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
838             asf->packet_size_left--;
839             asf->packet_multi_size--;
840             if (asf->packet_multi_size < asf->packet_obj_size)
841             {
842                 asf->packet_time_start = 0;
843                 url_fskip(pb, asf->packet_multi_size);
844                 asf->packet_size_left -= asf->packet_multi_size;
845                 continue;
846             }
847             asf->packet_multi_size -= asf->packet_obj_size;
848             //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);
849         }
850         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
851               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
852            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
853             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
854                 asf_st->frag_offset, asf->packet_frag_size,
855                 asf->packet_obj_size, asf_st->pkt.size);
856             asf->packet_obj_size= asf_st->pkt.size;
857         }
858
859         if (   asf_st->pkt.size != asf->packet_obj_size
860             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
861             if(asf_st->pkt.data){
862                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
863                 asf_st->frag_offset = 0;
864                 av_free_packet(&asf_st->pkt);
865             }
866             /* new packet */
867             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
868             asf_st->seq = asf->packet_seq;
869             asf_st->pkt.dts = asf->packet_frag_timestamp;
870             asf_st->pkt.stream_index = asf->stream_index;
871             asf_st->pkt.pos =
872             asf_st->packet_pos= asf->packet_pos;
873 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
874 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
875 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
876             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
877                 asf->packet_key_frame = 1;
878             if (asf->packet_key_frame)
879                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
880         }
881
882         /* read data */
883         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
884         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
885         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
886         asf->packet_size_left -= asf->packet_frag_size;
887         if (asf->packet_size_left < 0)
888             continue;
889
890         if(   asf->packet_frag_offset >= asf_st->pkt.size
891            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
892             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
893                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
894             continue;
895         }
896
897         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
898                          asf->packet_frag_size);
899         if (ret != asf->packet_frag_size) {
900             if (ret < 0 || asf->packet_frag_offset + ret == 0)
901                 return ret < 0 ? ret : AVERROR_EOF;
902             if (asf_st->ds_span > 1) {
903                 // scrambling, we can either drop it completely or fill the remainder
904                 // TODO: should we fill the whole packet instead of just the current
905                 // fragment?
906                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
907                        asf->packet_frag_size - ret);
908                 ret = asf->packet_frag_size;
909             } else
910                 // no scrambling, so we can return partial packets
911                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
912         }
913         if (s->key && s->keylen == 20)
914             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
915                             ret);
916         asf_st->frag_offset += ret;
917         /* test if whole packet is read */
918         if (asf_st->frag_offset == asf_st->pkt.size) {
919             //workaround for macroshit radio DVR-MS files
920             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
921                && asf_st->pkt.size > 100){
922                 int i;
923                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
924                 if(i == asf_st->pkt.size){
925                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
926                     asf_st->frag_offset = 0;
927                     av_free_packet(&asf_st->pkt);
928                     continue;
929                 }
930             }
931
932             /* return packet */
933             if (asf_st->ds_span > 1) {
934               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
935                     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);
936               }else{
937                 /* packet descrambling */
938                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
939                 if (newdata) {
940                     int offset = 0;
941                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
942                     while (offset < asf_st->pkt.size) {
943                         int off = offset / asf_st->ds_chunk_size;
944                         int row = off / asf_st->ds_span;
945                         int col = off % asf_st->ds_span;
946                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
947                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
948
949                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
950                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
951                         memcpy(newdata + offset,
952                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
953                                asf_st->ds_chunk_size);
954                         offset += asf_st->ds_chunk_size;
955                     }
956                     av_free(asf_st->pkt.data);
957                     asf_st->pkt.data = newdata;
958                 }
959               }
960             }
961             asf_st->frag_offset = 0;
962             *pkt= asf_st->pkt;
963             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
964             asf_st->pkt.size = 0;
965             asf_st->pkt.data = 0;
966             break; // packet completed
967         }
968     }
969     return 0;
970 }
971
972 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
973 {
974     ASFContext *asf = s->priv_data;
975
976     for (;;) {
977         int ret;
978
979         /* parse cached packets, if any */
980         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
981             return ret;
982         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
983             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
984         asf->packet_time_start = 0;
985     }
986
987     return 0;
988 }
989
990 // Added to support seeking after packets have been read
991 // If information is not reset, read_packet fails due to
992 // leftover information from previous reads
993 static void asf_reset_header(AVFormatContext *s)
994 {
995     ASFContext *asf = s->priv_data;
996     ASFStream *asf_st;
997     int i;
998
999     asf->packet_nb_frames = 0;
1000     asf->packet_size_left = 0;
1001     asf->packet_segments = 0;
1002     asf->packet_flags = 0;
1003     asf->packet_property = 0;
1004     asf->packet_timestamp = 0;
1005     asf->packet_segsizetype = 0;
1006     asf->packet_segments = 0;
1007     asf->packet_seq = 0;
1008     asf->packet_replic_size = 0;
1009     asf->packet_key_frame = 0;
1010     asf->packet_padsize = 0;
1011     asf->packet_frag_offset = 0;
1012     asf->packet_frag_size = 0;
1013     asf->packet_frag_timestamp = 0;
1014     asf->packet_multi_size = 0;
1015     asf->packet_obj_size = 0;
1016     asf->packet_time_delta = 0;
1017     asf->packet_time_start = 0;
1018
1019     for(i=0; i<s->nb_streams; i++){
1020         asf_st= s->streams[i]->priv_data;
1021         av_free_packet(&asf_st->pkt);
1022         asf_st->frag_offset=0;
1023         asf_st->seq=0;
1024     }
1025     asf->asf_st= NULL;
1026 }
1027
1028 static int asf_read_close(AVFormatContext *s)
1029 {
1030     int i;
1031
1032     asf_reset_header(s);
1033     for(i=0;i<s->nb_streams;i++) {
1034         AVStream *st = s->streams[i];
1035         av_free(st->codec->palctrl);
1036     }
1037     return 0;
1038 }
1039
1040 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1041 {
1042     AVPacket pkt1, *pkt = &pkt1;
1043     ASFStream *asf_st;
1044     int64_t pts;
1045     int64_t pos= *ppos;
1046     int i;
1047     int64_t start_pos[ASF_MAX_STREAMS];
1048
1049     for(i=0; i<s->nb_streams; i++){
1050         start_pos[i]= pos;
1051     }
1052
1053     if (s->packet_size > 0)
1054         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1055     *ppos= pos;
1056     url_fseek(s->pb, pos, SEEK_SET);
1057
1058 //printf("asf_read_pts\n");
1059     asf_reset_header(s);
1060     for(;;){
1061         if (av_read_frame(s, pkt) < 0){
1062             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1063             return AV_NOPTS_VALUE;
1064         }
1065
1066         pts= pkt->pts;
1067
1068         av_free_packet(pkt);
1069         if(pkt->flags&AV_PKT_FLAG_KEY){
1070             i= pkt->stream_index;
1071
1072             asf_st= s->streams[i]->priv_data;
1073
1074 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1075             pos= asf_st->packet_pos;
1076
1077             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1078             start_pos[i]= asf_st->packet_pos + 1;
1079
1080             if(pkt->stream_index == stream_index)
1081                break;
1082         }
1083     }
1084
1085     *ppos= pos;
1086 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1087
1088     return pts;
1089 }
1090
1091 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1092 {
1093     ff_asf_guid g;
1094     ASFContext *asf = s->priv_data;
1095     int64_t current_pos= url_ftell(s->pb);
1096     int i;
1097
1098     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1099     ff_get_guid(s->pb, &g);
1100
1101     /* the data object can be followed by other top-level objects,
1102        skip them until the simple index object is reached */
1103     while (ff_guidcmp(&g, &index_guid)) {
1104         int64_t gsize= get_le64(s->pb);
1105         if (gsize < 24 || url_feof(s->pb)) {
1106             url_fseek(s->pb, current_pos, SEEK_SET);
1107             return;
1108         }
1109         url_fseek(s->pb, gsize-24, SEEK_CUR);
1110         ff_get_guid(s->pb, &g);
1111     }
1112
1113     {
1114         int64_t itime, last_pos=-1;
1115         int pct, ict;
1116         int64_t av_unused gsize= get_le64(s->pb);
1117         ff_get_guid(s->pb, &g);
1118         itime=get_le64(s->pb);
1119         pct=get_le32(s->pb);
1120         ict=get_le32(s->pb);
1121         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1122
1123         for (i=0;i<ict;i++){
1124             int pktnum=get_le32(s->pb);
1125             int pktct =get_le16(s->pb);
1126             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1127             int64_t index_pts= av_rescale(itime, i, 10000);
1128
1129             if(pos != last_pos){
1130             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1131             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1132             last_pos=pos;
1133             }
1134         }
1135         asf->index_read= 1;
1136     }
1137     url_fseek(s->pb, current_pos, SEEK_SET);
1138 }
1139
1140 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1141 {
1142     ASFContext *asf = s->priv_data;
1143     AVStream *st = s->streams[stream_index];
1144     int64_t pos;
1145     int index;
1146
1147     if (s->packet_size <= 0)
1148         return -1;
1149
1150     /* Try using the protocol's read_seek if available */
1151     if(s->pb) {
1152         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1153         if(ret >= 0)
1154             asf_reset_header(s);
1155         if (ret != AVERROR(ENOSYS))
1156             return ret;
1157     }
1158
1159     if (!asf->index_read)
1160         asf_build_simple_index(s, stream_index);
1161
1162     if(!(asf->index_read && st->index_entries)){
1163         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1164             return -1;
1165     }else{
1166         index= av_index_search_timestamp(st, pts, flags);
1167         if(index<0)
1168             return -1;
1169
1170         /* find the position */
1171         pos = st->index_entries[index].pos;
1172
1173     // various attempts to find key frame have failed so far
1174     //    asf_reset_header(s);
1175     //    url_fseek(s->pb, pos, SEEK_SET);
1176     //    key_pos = pos;
1177     //     for(i=0;i<16;i++){
1178     //         pos = url_ftell(s->pb);
1179     //         if (av_read_frame(s, &pkt) < 0){
1180     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1181     //             return -1;
1182     //         }
1183     //         asf_st = s->streams[stream_index]->priv_data;
1184     //         pos += st->parser->frame_offset;
1185     //
1186     //         if (pkt.size > b) {
1187     //             b = pkt.size;
1188     //             key_pos = pos;
1189     //         }
1190     //
1191     //         av_free_packet(&pkt);
1192     //     }
1193
1194         /* do the seek */
1195         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1196         url_fseek(s->pb, pos, SEEK_SET);
1197     }
1198     asf_reset_header(s);
1199     return 0;
1200 }
1201
1202 AVInputFormat ff_asf_demuxer = {
1203     "asf",
1204     NULL_IF_CONFIG_SMALL("ASF format"),
1205     sizeof(ASFContext),
1206     asf_probe,
1207     asf_read_header,
1208     asf_read_packet,
1209     asf_read_close,
1210     asf_read_seek,
1211     asf_read_pts,
1212 };