asf: split ASFContext into muxer and demuxer parts.
[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 typedef struct {
36     int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID
37     ASFStream streams[128];              ///< it's max number and it's not that big
38     uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)
39     char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)
40     /* non streamed additonnal info */
41     uint64_t nb_packets;                 ///< how many packets are there in the file, invalid if broadcasting
42     /* packet filling */
43     int packet_size_left;
44     int packet_nb_frames;
45     /* only for reading */
46     uint64_t data_offset;                ///< beginning of the first data packet
47     uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)
48     uint64_t data_object_size;           ///< size of the data object
49     int index_read;
50
51     ASFMainHeader hdr;
52
53     int packet_flags;
54     int packet_property;
55     int packet_timestamp;
56     int packet_segsizetype;
57     int packet_segments;
58     int packet_seq;
59     int packet_replic_size;
60     int packet_key_frame;
61     int packet_padsize;
62     unsigned int packet_frag_offset;
63     unsigned int packet_frag_size;
64     int64_t packet_frag_timestamp;
65     int packet_multi_size;
66     int packet_obj_size;
67     int packet_time_delta;
68     int packet_time_start;
69     int64_t packet_pos;
70
71     int stream_index;
72
73     ASFStream* asf_st;                   ///< currently decoded stream
74 } ASFContext;
75
76 #undef NDEBUG
77 #include <assert.h>
78
79 #define ASF_MAX_STREAMS 127
80 #define FRAME_HEADER_SIZE 17
81 // Fix Me! FRAME_HEADER_SIZE may be different.
82
83 static const ff_asf_guid index_guid = {
84     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
85 };
86
87 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
88     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
89 };
90 /**********************************/
91 /* decoding */
92
93 #ifdef DEBUG
94 #define PRINT_IF_GUID(g,cmp) \
95 if (!ff_guidcmp(g, &cmp)) \
96     av_dlog(NULL, "(GUID: %s) ", #cmp)
97
98 static void print_guid(const ff_asf_guid *g)
99 {
100     int i;
101     PRINT_IF_GUID(g, ff_asf_header);
102     else PRINT_IF_GUID(g, ff_asf_file_header);
103     else PRINT_IF_GUID(g, ff_asf_stream_header);
104     else PRINT_IF_GUID(g, ff_asf_audio_stream);
105     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
106     else PRINT_IF_GUID(g, ff_asf_video_stream);
107     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
108     else PRINT_IF_GUID(g, ff_asf_command_stream);
109     else PRINT_IF_GUID(g, ff_asf_comment_header);
110     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
111     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
112     else PRINT_IF_GUID(g, ff_asf_data_header);
113     else PRINT_IF_GUID(g, index_guid);
114     else PRINT_IF_GUID(g, ff_asf_head1_guid);
115     else PRINT_IF_GUID(g, ff_asf_head2_guid);
116     else PRINT_IF_GUID(g, ff_asf_my_guid);
117     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
118     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
119     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
120     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
121     else PRINT_IF_GUID(g, ff_asf_metadata_header);
122     else PRINT_IF_GUID(g, ff_asf_marker_header);
123     else PRINT_IF_GUID(g, stream_bitrate_guid);
124     else PRINT_IF_GUID(g, ff_asf_language_guid);
125     else
126         av_dlog(NULL, "(GUID: unknown) ");
127     for(i=0;i<16;i++)
128         av_dlog(NULL, " 0x%02x,", (*g)[i]);
129     av_dlog(NULL, "}\n");
130 }
131 #undef PRINT_IF_GUID
132 #else
133 #define print_guid(g)
134 #endif
135
136 void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
137 {
138     assert(sizeof(*g) == 16);
139     get_buffer(s, *g, sizeof(*g));
140 }
141
142 static int asf_probe(AVProbeData *pd)
143 {
144     /* check file header */
145     if (!ff_guidcmp(pd->buf, &ff_asf_header))
146         return AVPROBE_SCORE_MAX;
147     else
148         return 0;
149 }
150
151 static int get_value(ByteIOContext *pb, int type){
152     switch(type){
153         case 2: return get_le32(pb);
154         case 3: return get_le32(pb);
155         case 4: return get_le64(pb);
156         case 5: return get_le16(pb);
157         default:return INT_MIN;
158     }
159 }
160
161 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
162 {
163     char *value;
164     int64_t off = url_ftell(s->pb);
165
166     if ((unsigned)len >= (UINT_MAX - 1)/2)
167         return;
168
169     value = av_malloc(2*len+1);
170     if (!value)
171         goto finish;
172
173     if (type == 0) {         // UTF16-LE
174         avio_get_str16le(s->pb, len, value, 2*len + 1);
175     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
176         uint64_t num = get_value(s->pb, type);
177         snprintf(value, len, "%"PRIu64, num);
178     } else {
179         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
180         goto finish;
181     }
182     av_metadata_set2(&s->metadata, key, value, 0);
183 finish:
184     av_freep(&value);
185     url_fseek(s->pb, off + len, SEEK_SET);
186 }
187
188 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
189 {
190     ASFContext *asf = s->priv_data;
191     ff_asf_guid g;
192     ByteIOContext *pb = s->pb;
193     AVStream *st;
194     ASFStream *asf_st;
195     int size, i;
196     int64_t gsize;
197     AVRational dar[128];
198     uint32_t bitrate[128];
199
200     memset(dar, 0, sizeof(dar));
201     memset(bitrate, 0, sizeof(bitrate));
202
203     ff_get_guid(pb, &g);
204     if (ff_guidcmp(&g, &ff_asf_header))
205         return -1;
206     get_le64(pb);
207     get_le32(pb);
208     get_byte(pb);
209     get_byte(pb);
210     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
211     for(;;) {
212         uint64_t gpos= url_ftell(pb);
213         int ret;
214         ff_get_guid(pb, &g);
215         gsize = get_le64(pb);
216         av_dlog(s, "%08"PRIx64": ", gpos);
217         print_guid(&g);
218         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
219         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
220             asf->data_object_offset = url_ftell(pb);
221             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
222             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
223                 asf->data_object_size = gsize - 24;
224             } else {
225                 asf->data_object_size = (uint64_t)-1;
226             }
227             break;
228         }
229         if (gsize < 24)
230             return -1;
231         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
232             ff_get_guid(pb, &asf->hdr.guid);
233             asf->hdr.file_size          = get_le64(pb);
234             asf->hdr.create_time        = get_le64(pb);
235             asf->nb_packets             = get_le64(pb);
236             asf->hdr.play_time          = get_le64(pb);
237             asf->hdr.send_time          = get_le64(pb);
238             asf->hdr.preroll            = get_le32(pb);
239             asf->hdr.ignore             = get_le32(pb);
240             asf->hdr.flags              = get_le32(pb);
241             asf->hdr.min_pktsize        = get_le32(pb);
242             asf->hdr.max_pktsize        = get_le32(pb);
243             asf->hdr.max_bitrate        = get_le32(pb);
244             s->packet_size = asf->hdr.max_pktsize;
245         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
246             enum AVMediaType type;
247             int type_specific_size, sizeX;
248             uint64_t total_size;
249             unsigned int tag1;
250             int64_t pos1, pos2, start_time;
251             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
252
253             if (s->nb_streams == ASF_MAX_STREAMS) {
254                 av_log(s, AV_LOG_ERROR, "too many streams\n");
255                 return AVERROR(EINVAL);
256             }
257
258             pos1 = url_ftell(pb);
259
260             st = av_new_stream(s, 0);
261             if (!st)
262                 return AVERROR(ENOMEM);
263             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
264             asf_st = av_mallocz(sizeof(ASFStream));
265             if (!asf_st)
266                 return AVERROR(ENOMEM);
267             st->priv_data = asf_st;
268             start_time = asf->hdr.preroll;
269
270             asf_st->stream_language_index = 128; // invalid stream index means no language info
271
272             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
273                 st->duration = asf->hdr.play_time /
274                     (10000000 / 1000) - start_time;
275             }
276             ff_get_guid(pb, &g);
277
278             test_for_ext_stream_audio = 0;
279             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
280                 type = AVMEDIA_TYPE_AUDIO;
281             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
282                 type = AVMEDIA_TYPE_VIDEO;
283             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
284                 type = AVMEDIA_TYPE_VIDEO;
285                 st->codec->codec_id = CODEC_ID_MJPEG;
286             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
287                 type = AVMEDIA_TYPE_DATA;
288             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
289                 test_for_ext_stream_audio = 1;
290                 type = AVMEDIA_TYPE_UNKNOWN;
291             } else {
292                 return -1;
293             }
294             ff_get_guid(pb, &g);
295             total_size = get_le64(pb);
296             type_specific_size = get_le32(pb);
297             get_le32(pb);
298             st->id = get_le16(pb) & 0x7f; /* stream id */
299             // mapping of asf ID to AV stream ID;
300             asf->asfid2avid[st->id] = s->nb_streams - 1;
301
302             get_le32(pb);
303
304             if (test_for_ext_stream_audio) {
305                 ff_get_guid(pb, &g);
306                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
307                     type = AVMEDIA_TYPE_AUDIO;
308                     is_dvr_ms_audio=1;
309                     ff_get_guid(pb, &g);
310                     get_le32(pb);
311                     get_le32(pb);
312                     get_le32(pb);
313                     ff_get_guid(pb, &g);
314                     get_le32(pb);
315                 }
316             }
317
318             st->codec->codec_type = type;
319             if (type == AVMEDIA_TYPE_AUDIO) {
320                 ff_get_wav_header(pb, st->codec, type_specific_size);
321                 if (is_dvr_ms_audio) {
322                     // codec_id and codec_tag are unreliable in dvr_ms
323                     // files. Set them later by probing stream.
324                     st->codec->codec_id = CODEC_ID_PROBE;
325                     st->codec->codec_tag = 0;
326                 }
327                 if (st->codec->codec_id == CODEC_ID_AAC) {
328                     st->need_parsing = AVSTREAM_PARSE_NONE;
329                 } else {
330                     st->need_parsing = AVSTREAM_PARSE_FULL;
331                 }
332                 /* We have to init the frame size at some point .... */
333                 pos2 = url_ftell(pb);
334                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
335                     asf_st->ds_span = get_byte(pb);
336                     asf_st->ds_packet_size = get_le16(pb);
337                     asf_st->ds_chunk_size = get_le16(pb);
338                     get_le16(pb); //ds_data_size
339                     get_byte(pb); //ds_silence_data
340                 }
341                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
342                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
343                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
344                 if (asf_st->ds_span > 1) {
345                     if (!asf_st->ds_chunk_size
346                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
347                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
348                         asf_st->ds_span = 0; // disable descrambling
349                 }
350                 switch (st->codec->codec_id) {
351                 case CODEC_ID_MP3:
352                     st->codec->frame_size = MPA_FRAME_SIZE;
353                     break;
354                 case CODEC_ID_PCM_S16LE:
355                 case CODEC_ID_PCM_S16BE:
356                 case CODEC_ID_PCM_U16LE:
357                 case CODEC_ID_PCM_U16BE:
358                 case CODEC_ID_PCM_S8:
359                 case CODEC_ID_PCM_U8:
360                 case CODEC_ID_PCM_ALAW:
361                 case CODEC_ID_PCM_MULAW:
362                     st->codec->frame_size = 1;
363                     break;
364                 default:
365                     /* This is probably wrong, but it prevents a crash later */
366                     st->codec->frame_size = 1;
367                     break;
368                 }
369             } else if (type == AVMEDIA_TYPE_VIDEO &&
370                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
371                 get_le32(pb);
372                 get_le32(pb);
373                 get_byte(pb);
374                 size = get_le16(pb); /* size */
375                 sizeX= get_le32(pb); /* size */
376                 st->codec->width = get_le32(pb);
377                 st->codec->height = get_le32(pb);
378                 /* not available for asf */
379                 get_le16(pb); /* panes */
380                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
381                 tag1 = get_le32(pb);
382                 url_fskip(pb, 20);
383 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
384                 size= sizeX;
385                 if (size > 40) {
386                     st->codec->extradata_size = size - 40;
387                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
388                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
389                 }
390
391                 /* Extract palette from extradata if bpp <= 8 */
392                 /* This code assumes that extradata contains only palette */
393                 /* This is true for all paletted codecs implemented in ffmpeg */
394                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
395                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
396 #if HAVE_BIGENDIAN
397                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
398                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
399 #else
400                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
401                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
402 #endif
403                     st->codec->palctrl->palette_changed = 1;
404                 }
405
406                 st->codec->codec_tag = tag1;
407                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
408                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
409                     st->need_parsing = AVSTREAM_PARSE_FULL;
410                     // 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
411                     st->codec->width  =
412                     st->codec->height = 0;
413                     av_freep(&st->codec->extradata);
414                     st->codec->extradata_size=0;
415                 }
416                 if(st->codec->codec_id == CODEC_ID_H264)
417                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
418             }
419             pos2 = url_ftell(pb);
420             url_fskip(pb, gsize - (pos2 - pos1 + 24));
421         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
422             int len1, len2, len3, len4, len5;
423
424             len1 = get_le16(pb);
425             len2 = get_le16(pb);
426             len3 = get_le16(pb);
427             len4 = get_le16(pb);
428             len5 = get_le16(pb);
429             get_tag(s, "title"    , 0, len1);
430             get_tag(s, "author"   , 0, len2);
431             get_tag(s, "copyright", 0, len3);
432             get_tag(s, "comment"  , 0, len4);
433             url_fskip(pb, len5);
434         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
435             int stream_count = get_le16(pb);
436             int j;
437
438 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
439 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
440             for(j = 0; j < stream_count; j++) {
441                 int flags, bitrate, stream_id;
442
443                 flags= get_le16(pb);
444                 bitrate= get_le32(pb);
445                 stream_id= (flags & 0x7f);
446 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
447                 asf->stream_bitrates[stream_id]= bitrate;
448             }
449         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
450             int j;
451             int stream_count = get_le16(pb);
452             for(j = 0; j < stream_count; j++) {
453                 char lang[6];
454                 unsigned int lang_len = get_byte(pb);
455                 if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
456                     url_fskip(pb, lang_len - ret);
457                 if (j < 128)
458                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
459             }
460         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
461             int desc_count, i;
462
463             desc_count = get_le16(pb);
464             for(i=0;i<desc_count;i++) {
465                     int name_len,value_type,value_len;
466                     char name[1024];
467
468                     name_len = get_le16(pb);
469                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
470                         name_len += 1;
471                     if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
472                         url_fskip(pb, name_len - ret);
473                     value_type = get_le16(pb);
474                     value_len  = get_le16(pb);
475                     if (!value_type && value_len%2)
476                         value_len += 1;
477                     /**
478                      * My sample has that stream set to 0 maybe that mean the container.
479                      * Asf stream count start at 1. I am using 0 to the container value since it's unused
480                      */
481                     if (!strcmp(name, "AspectRatioX")){
482                         dar[0].num= get_value(s->pb, value_type);
483                     } else if(!strcmp(name, "AspectRatioY")){
484                         dar[0].den= get_value(s->pb, value_type);
485                     } else
486                         get_tag(s, name, value_type, value_len);
487             }
488         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
489             int n, stream_num, name_len, value_len, value_type, value_num;
490             n = get_le16(pb);
491
492             for(i=0;i<n;i++) {
493                 char name[1024];
494
495                 get_le16(pb); //lang_list_index
496                 stream_num= get_le16(pb);
497                 name_len=   get_le16(pb);
498                 value_type= get_le16(pb);
499                 value_len=  get_le32(pb);
500
501                 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
502                     url_fskip(pb, name_len - ret);
503 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
504                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
505                 url_fskip(pb, value_len - 2);
506
507                 if(stream_num<128){
508                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
509                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
510                 }
511             }
512         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
513             int ext_len, payload_ext_ct, stream_ct;
514             uint32_t ext_d, leak_rate, stream_num;
515             unsigned int stream_languageid_index;
516
517             get_le64(pb); // starttime
518             get_le64(pb); // endtime
519             leak_rate = get_le32(pb); // leak-datarate
520             get_le32(pb); // bucket-datasize
521             get_le32(pb); // init-bucket-fullness
522             get_le32(pb); // alt-leak-datarate
523             get_le32(pb); // alt-bucket-datasize
524             get_le32(pb); // alt-init-bucket-fullness
525             get_le32(pb); // max-object-size
526             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
527             stream_num = get_le16(pb); // stream-num
528
529             stream_languageid_index = get_le16(pb); // stream-language-id-index
530             if (stream_num < 128)
531                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
532
533             get_le64(pb); // avg frametime in 100ns units
534             stream_ct = get_le16(pb); //stream-name-count
535             payload_ext_ct = get_le16(pb); //payload-extension-system-count
536
537             if (stream_num < 128)
538                 bitrate[stream_num] = leak_rate;
539
540             for (i=0; i<stream_ct; i++){
541                 get_le16(pb);
542                 ext_len = get_le16(pb);
543                 url_fseek(pb, ext_len, SEEK_CUR);
544             }
545
546             for (i=0; i<payload_ext_ct; i++){
547                 ff_get_guid(pb, &g);
548                 ext_d=get_le16(pb);
549                 ext_len=get_le32(pb);
550                 url_fseek(pb, ext_len, SEEK_CUR);
551             }
552
553             // there could be a optional stream properties object to follow
554             // if so the next iteration will pick it up
555             continue;
556         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
557             int v1, v2;
558             ff_get_guid(pb, &g);
559             v1 = get_le32(pb);
560             v2 = get_le16(pb);
561             continue;
562         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
563             int i, count, name_len;
564             char name[1024];
565
566             get_le64(pb);            // reserved 16 bytes
567             get_le64(pb);            // ...
568             count = get_le32(pb);    // markers count
569             get_le16(pb);            // reserved 2 bytes
570             name_len = get_le16(pb); // name length
571             for(i=0;i<name_len;i++){
572                 get_byte(pb); // skip the name
573             }
574
575             for(i=0;i<count;i++){
576                 int64_t pres_time;
577                 int name_len;
578
579                 get_le64(pb);             // offset, 8 bytes
580                 pres_time = get_le64(pb); // presentation time
581                 get_le16(pb);             // entry length
582                 get_le32(pb);             // send time
583                 get_le32(pb);             // flags
584                 name_len = get_le32(pb);  // name length
585                 if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
586                     url_fskip(pb, name_len - ret);
587                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
588             }
589         } else if (url_feof(pb)) {
590             return -1;
591         } else {
592             if (!s->keylen) {
593                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
594                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
595                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
596                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
597                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
598                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
599                 }
600             }
601         }
602         if(url_ftell(pb) != gpos + gsize)
603             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
604         url_fseek(pb, gpos + gsize, SEEK_SET);
605     }
606     ff_get_guid(pb, &g);
607     get_le64(pb);
608     get_byte(pb);
609     get_byte(pb);
610     if (url_feof(pb))
611         return -1;
612     asf->data_offset = url_ftell(pb);
613     asf->packet_size_left = 0;
614
615
616     for(i=0; i<128; i++){
617         int stream_num= asf->asfid2avid[i];
618         if(stream_num>=0){
619             AVStream *st = s->streams[stream_num];
620             if (!st->codec->bit_rate)
621                 st->codec->bit_rate = bitrate[i];
622             if (dar[i].num > 0 && dar[i].den > 0){
623                 av_reduce(&st->sample_aspect_ratio.num,
624                           &st->sample_aspect_ratio.den,
625                           dar[i].num, dar[i].den, INT_MAX);
626             } 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.
627                 av_reduce(&st->sample_aspect_ratio.num,
628                           &st->sample_aspect_ratio.den,
629                           dar[0].num, dar[0].den, INT_MAX);
630
631 //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);
632
633             // copy and convert language codes to the frontend
634             if (asf->streams[i].stream_language_index < 128) {
635                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
636                 if (rfc1766 && strlen(rfc1766) > 1) {
637                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
638                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
639                     if (iso6392)
640                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
641                 }
642             }
643         }
644     }
645
646     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
647
648     return 0;
649 }
650
651 #define DO_2BITS(bits, var, defval) \
652     switch (bits & 3) \
653     { \
654     case 3: var = get_le32(pb); rsize += 4; break; \
655     case 2: var = get_le16(pb); rsize += 2; break; \
656     case 1: var = get_byte(pb); rsize++; break; \
657     default: var = defval; break; \
658     }
659
660 /**
661  * Load a single ASF packet into the demuxer.
662  * @param s demux context
663  * @param pb context to read data from
664  * @return 0 on success, <0 on error
665  */
666 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
667 {
668     ASFContext *asf = s->priv_data;
669     uint32_t packet_length, padsize;
670     int rsize = 8;
671     int c, d, e, off;
672
673     // if we do not know packet size, allow skipping up to 32 kB
674     off= 32768;
675     if (s->packet_size > 0)
676         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
677
678     c=d=e=-1;
679     while(off-- > 0){
680         c=d; d=e;
681         e= get_byte(pb);
682         if(c == 0x82 && !d && !e)
683             break;
684     }
685
686     if (c != 0x82) {
687         /**
688          * This code allows handling of -EAGAIN at packet boundaries (i.e.
689          * if the packet sync code above triggers -EAGAIN). This does not
690          * imply complete -EAGAIN handling support at random positions in
691          * the stream.
692          */
693         if (url_ferror(pb) == AVERROR(EAGAIN))
694             return AVERROR(EAGAIN);
695         if (!url_feof(pb))
696             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
697     }
698     if ((c & 0x8f) == 0x82) {
699         if (d || e) {
700             if (!url_feof(pb))
701                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
702             return -1;
703         }
704         c= get_byte(pb);
705         d= get_byte(pb);
706         rsize+=3;
707     }else{
708         url_fseek(pb, -1, SEEK_CUR); //FIXME
709     }
710
711     asf->packet_flags    = c;
712     asf->packet_property = d;
713
714     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
715     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
716     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
717
718     //the following checks prevent overflows and infinite loops
719     if(!packet_length || packet_length >= (1U<<29)){
720         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
721         return -1;
722     }
723     if(padsize >= packet_length){
724         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
725         return -1;
726     }
727
728     asf->packet_timestamp = get_le32(pb);
729     get_le16(pb); /* duration */
730     // rsize has at least 11 bytes which have to be present
731
732     if (asf->packet_flags & 0x01) {
733         asf->packet_segsizetype = get_byte(pb); rsize++;
734         asf->packet_segments = asf->packet_segsizetype & 0x3f;
735     } else {
736         asf->packet_segments = 1;
737         asf->packet_segsizetype = 0x80;
738     }
739     asf->packet_size_left = packet_length - padsize - rsize;
740     if (packet_length < asf->hdr.min_pktsize)
741         padsize += asf->hdr.min_pktsize - packet_length;
742     asf->packet_padsize = padsize;
743     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
744     return 0;
745 }
746
747 /**
748  *
749  * @return <0 if error
750  */
751 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
752     ASFContext *asf = s->priv_data;
753     int rsize = 1;
754     int num = get_byte(pb);
755     int64_t ts0, ts1;
756
757     asf->packet_segments--;
758     asf->packet_key_frame = num >> 7;
759     asf->stream_index = asf->asfid2avid[num & 0x7f];
760     // sequence should be ignored!
761     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
762     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
763     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
764 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
765     if (asf->packet_replic_size >= 8) {
766         asf->packet_obj_size = get_le32(pb);
767         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
768             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
769             return -1;
770         }
771         asf->packet_frag_timestamp = get_le32(pb); // timestamp
772         if(asf->packet_replic_size >= 8+38+4){
773 //            for(i=0; i<asf->packet_replic_size-8; i++)
774 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
775 //            av_log(s, AV_LOG_DEBUG, "\n");
776             url_fskip(pb, 10);
777             ts0= get_le64(pb);
778             ts1= get_le64(pb);
779             url_fskip(pb, 12);
780             get_le32(pb);
781             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
782             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
783             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
784         }else
785             url_fskip(pb, asf->packet_replic_size - 8);
786         rsize += asf->packet_replic_size; // FIXME - check validity
787     } else if (asf->packet_replic_size==1){
788         // multipacket - frag_offset is beginning timestamp
789         asf->packet_time_start = asf->packet_frag_offset;
790         asf->packet_frag_offset = 0;
791         asf->packet_frag_timestamp = asf->packet_timestamp;
792
793         asf->packet_time_delta = get_byte(pb);
794         rsize++;
795     }else if(asf->packet_replic_size!=0){
796         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
797         return -1;
798     }
799     if (asf->packet_flags & 0x01) {
800         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
801         if(asf->packet_frag_size > asf->packet_size_left - rsize){
802             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
803             return -1;
804         }
805         //printf("Fragsize %d\n", asf->packet_frag_size);
806     } else {
807         asf->packet_frag_size = asf->packet_size_left - rsize;
808         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
809     }
810     if (asf->packet_replic_size == 1) {
811         asf->packet_multi_size = asf->packet_frag_size;
812         if (asf->packet_multi_size > asf->packet_size_left)
813             return -1;
814     }
815     asf->packet_size_left -= rsize;
816     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
817
818     return 0;
819 }
820
821 /**
822  * Parse data from individual ASF packets (which were previously loaded
823  * with asf_get_packet()).
824  * @param s demux context
825  * @param pb context to read data from
826  * @param pkt pointer to store packet data into
827  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
828  *          packets need to be loaded (through asf_get_packet())
829  */
830 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
831 {
832     ASFContext *asf = s->priv_data;
833     ASFStream *asf_st = 0;
834     for (;;) {
835         int ret;
836         if(url_feof(pb))
837             return AVERROR_EOF;
838         if (asf->packet_size_left < FRAME_HEADER_SIZE
839             || asf->packet_segments < 1) {
840             //asf->packet_size_left <= asf->packet_padsize) {
841             int ret = asf->packet_size_left + asf->packet_padsize;
842             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
843             assert(ret>=0);
844             /* fail safe */
845             url_fskip(pb, ret);
846
847             asf->packet_pos= url_ftell(pb);
848             if (asf->data_object_size != (uint64_t)-1 &&
849                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
850                 return AVERROR_EOF; /* Do not exceed the size of the data object */
851             return 1;
852         }
853         if (asf->packet_time_start == 0) {
854             if(asf_read_frame_header(s, pb) < 0){
855                 asf->packet_segments= 0;
856                 continue;
857             }
858             if (asf->stream_index < 0
859                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
860                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
861                 ) {
862                 asf->packet_time_start = 0;
863                 /* unhandled packet (should not happen) */
864                 url_fskip(pb, asf->packet_frag_size);
865                 asf->packet_size_left -= asf->packet_frag_size;
866                 if(asf->stream_index < 0)
867                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
868                 continue;
869             }
870             asf->asf_st = s->streams[asf->stream_index]->priv_data;
871         }
872         asf_st = asf->asf_st;
873
874         if (asf->packet_replic_size == 1) {
875             // frag_offset is here used as the beginning timestamp
876             asf->packet_frag_timestamp = asf->packet_time_start;
877             asf->packet_time_start += asf->packet_time_delta;
878             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
879             asf->packet_size_left--;
880             asf->packet_multi_size--;
881             if (asf->packet_multi_size < asf->packet_obj_size)
882             {
883                 asf->packet_time_start = 0;
884                 url_fskip(pb, asf->packet_multi_size);
885                 asf->packet_size_left -= asf->packet_multi_size;
886                 continue;
887             }
888             asf->packet_multi_size -= asf->packet_obj_size;
889             //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);
890         }
891         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
892               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
893            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
894             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
895                 asf_st->frag_offset, asf->packet_frag_size,
896                 asf->packet_obj_size, asf_st->pkt.size);
897             asf->packet_obj_size= asf_st->pkt.size;
898         }
899
900         if (   asf_st->pkt.size != asf->packet_obj_size
901             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
902             if(asf_st->pkt.data){
903                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
904                 asf_st->frag_offset = 0;
905                 av_free_packet(&asf_st->pkt);
906             }
907             /* new packet */
908             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
909             asf_st->seq = asf->packet_seq;
910             asf_st->pkt.dts = asf->packet_frag_timestamp;
911             asf_st->pkt.stream_index = asf->stream_index;
912             asf_st->pkt.pos =
913             asf_st->packet_pos= asf->packet_pos;
914 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
915 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
916 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
917             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
918                 asf->packet_key_frame = 1;
919             if (asf->packet_key_frame)
920                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
921         }
922
923         /* read data */
924         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
925         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
926         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
927         asf->packet_size_left -= asf->packet_frag_size;
928         if (asf->packet_size_left < 0)
929             continue;
930
931         if(   asf->packet_frag_offset >= asf_st->pkt.size
932            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
933             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
934                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
935             continue;
936         }
937
938         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
939                          asf->packet_frag_size);
940         if (ret != asf->packet_frag_size) {
941             if (ret < 0 || asf->packet_frag_offset + ret == 0)
942                 return ret < 0 ? ret : AVERROR_EOF;
943             if (asf_st->ds_span > 1) {
944                 // scrambling, we can either drop it completely or fill the remainder
945                 // TODO: should we fill the whole packet instead of just the current
946                 // fragment?
947                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
948                        asf->packet_frag_size - ret);
949                 ret = asf->packet_frag_size;
950             } else
951                 // no scrambling, so we can return partial packets
952                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
953         }
954         if (s->key && s->keylen == 20)
955             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
956                             ret);
957         asf_st->frag_offset += ret;
958         /* test if whole packet is read */
959         if (asf_st->frag_offset == asf_st->pkt.size) {
960             //workaround for macroshit radio DVR-MS files
961             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
962                && asf_st->pkt.size > 100){
963                 int i;
964                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
965                 if(i == asf_st->pkt.size){
966                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
967                     asf_st->frag_offset = 0;
968                     av_free_packet(&asf_st->pkt);
969                     continue;
970                 }
971             }
972
973             /* return packet */
974             if (asf_st->ds_span > 1) {
975               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
976                     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);
977               }else{
978                 /* packet descrambling */
979                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
980                 if (newdata) {
981                     int offset = 0;
982                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
983                     while (offset < asf_st->pkt.size) {
984                         int off = offset / asf_st->ds_chunk_size;
985                         int row = off / asf_st->ds_span;
986                         int col = off % asf_st->ds_span;
987                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
988                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
989
990                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
991                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
992                         memcpy(newdata + offset,
993                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
994                                asf_st->ds_chunk_size);
995                         offset += asf_st->ds_chunk_size;
996                     }
997                     av_free(asf_st->pkt.data);
998                     asf_st->pkt.data = newdata;
999                 }
1000               }
1001             }
1002             asf_st->frag_offset = 0;
1003             *pkt= asf_st->pkt;
1004             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
1005             asf_st->pkt.size = 0;
1006             asf_st->pkt.data = 0;
1007             break; // packet completed
1008         }
1009     }
1010     return 0;
1011 }
1012
1013 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1014 {
1015     ASFContext *asf = s->priv_data;
1016
1017     for (;;) {
1018         int ret;
1019
1020         /* parse cached packets, if any */
1021         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1022             return ret;
1023         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1024             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1025         asf->packet_time_start = 0;
1026     }
1027
1028     return 0;
1029 }
1030
1031 // Added to support seeking after packets have been read
1032 // If information is not reset, read_packet fails due to
1033 // leftover information from previous reads
1034 static void asf_reset_header(AVFormatContext *s)
1035 {
1036     ASFContext *asf = s->priv_data;
1037     ASFStream *asf_st;
1038     int i;
1039
1040     asf->packet_nb_frames = 0;
1041     asf->packet_size_left = 0;
1042     asf->packet_segments = 0;
1043     asf->packet_flags = 0;
1044     asf->packet_property = 0;
1045     asf->packet_timestamp = 0;
1046     asf->packet_segsizetype = 0;
1047     asf->packet_segments = 0;
1048     asf->packet_seq = 0;
1049     asf->packet_replic_size = 0;
1050     asf->packet_key_frame = 0;
1051     asf->packet_padsize = 0;
1052     asf->packet_frag_offset = 0;
1053     asf->packet_frag_size = 0;
1054     asf->packet_frag_timestamp = 0;
1055     asf->packet_multi_size = 0;
1056     asf->packet_obj_size = 0;
1057     asf->packet_time_delta = 0;
1058     asf->packet_time_start = 0;
1059
1060     for(i=0; i<s->nb_streams; i++){
1061         asf_st= s->streams[i]->priv_data;
1062         av_free_packet(&asf_st->pkt);
1063         asf_st->frag_offset=0;
1064         asf_st->seq=0;
1065     }
1066     asf->asf_st= NULL;
1067 }
1068
1069 static int asf_read_close(AVFormatContext *s)
1070 {
1071     int i;
1072
1073     asf_reset_header(s);
1074     for(i=0;i<s->nb_streams;i++) {
1075         AVStream *st = s->streams[i];
1076         av_free(st->codec->palctrl);
1077     }
1078     return 0;
1079 }
1080
1081 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1082 {
1083     AVPacket pkt1, *pkt = &pkt1;
1084     ASFStream *asf_st;
1085     int64_t pts;
1086     int64_t pos= *ppos;
1087     int i;
1088     int64_t start_pos[ASF_MAX_STREAMS];
1089
1090     for(i=0; i<s->nb_streams; i++){
1091         start_pos[i]= pos;
1092     }
1093
1094     if (s->packet_size > 0)
1095         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1096     *ppos= pos;
1097     url_fseek(s->pb, pos, SEEK_SET);
1098
1099 //printf("asf_read_pts\n");
1100     asf_reset_header(s);
1101     for(;;){
1102         if (av_read_frame(s, pkt) < 0){
1103             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1104             return AV_NOPTS_VALUE;
1105         }
1106
1107         pts= pkt->pts;
1108
1109         av_free_packet(pkt);
1110         if(pkt->flags&AV_PKT_FLAG_KEY){
1111             i= pkt->stream_index;
1112
1113             asf_st= s->streams[i]->priv_data;
1114
1115 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1116             pos= asf_st->packet_pos;
1117
1118             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1119             start_pos[i]= asf_st->packet_pos + 1;
1120
1121             if(pkt->stream_index == stream_index)
1122                break;
1123         }
1124     }
1125
1126     *ppos= pos;
1127 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1128
1129     return pts;
1130 }
1131
1132 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1133 {
1134     ff_asf_guid g;
1135     ASFContext *asf = s->priv_data;
1136     int64_t current_pos= url_ftell(s->pb);
1137     int i;
1138
1139     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1140     ff_get_guid(s->pb, &g);
1141
1142     /* the data object can be followed by other top-level objects,
1143        skip them until the simple index object is reached */
1144     while (ff_guidcmp(&g, &index_guid)) {
1145         int64_t gsize= get_le64(s->pb);
1146         if (gsize < 24 || url_feof(s->pb)) {
1147             url_fseek(s->pb, current_pos, SEEK_SET);
1148             return;
1149         }
1150         url_fseek(s->pb, gsize-24, SEEK_CUR);
1151         ff_get_guid(s->pb, &g);
1152     }
1153
1154     {
1155         int64_t itime, last_pos=-1;
1156         int pct, ict;
1157         int64_t av_unused gsize= get_le64(s->pb);
1158         ff_get_guid(s->pb, &g);
1159         itime=get_le64(s->pb);
1160         pct=get_le32(s->pb);
1161         ict=get_le32(s->pb);
1162         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1163
1164         for (i=0;i<ict;i++){
1165             int pktnum=get_le32(s->pb);
1166             int pktct =get_le16(s->pb);
1167             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1168             int64_t index_pts= av_rescale(itime, i, 10000);
1169
1170             if(pos != last_pos){
1171             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1172             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1173             last_pos=pos;
1174             }
1175         }
1176         asf->index_read= 1;
1177     }
1178     url_fseek(s->pb, current_pos, SEEK_SET);
1179 }
1180
1181 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1182 {
1183     ASFContext *asf = s->priv_data;
1184     AVStream *st = s->streams[stream_index];
1185     int64_t pos;
1186     int index;
1187
1188     if (s->packet_size <= 0)
1189         return -1;
1190
1191     /* Try using the protocol's read_seek if available */
1192     if(s->pb) {
1193         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1194         if(ret >= 0)
1195             asf_reset_header(s);
1196         if (ret != AVERROR(ENOSYS))
1197             return ret;
1198     }
1199
1200     if (!asf->index_read)
1201         asf_build_simple_index(s, stream_index);
1202
1203     if(!(asf->index_read && st->index_entries)){
1204         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1205             return -1;
1206     }else{
1207         index= av_index_search_timestamp(st, pts, flags);
1208         if(index<0)
1209             return -1;
1210
1211         /* find the position */
1212         pos = st->index_entries[index].pos;
1213
1214     // various attempts to find key frame have failed so far
1215     //    asf_reset_header(s);
1216     //    url_fseek(s->pb, pos, SEEK_SET);
1217     //    key_pos = pos;
1218     //     for(i=0;i<16;i++){
1219     //         pos = url_ftell(s->pb);
1220     //         if (av_read_frame(s, &pkt) < 0){
1221     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1222     //             return -1;
1223     //         }
1224     //         asf_st = s->streams[stream_index]->priv_data;
1225     //         pos += st->parser->frame_offset;
1226     //
1227     //         if (pkt.size > b) {
1228     //             b = pkt.size;
1229     //             key_pos = pos;
1230     //         }
1231     //
1232     //         av_free_packet(&pkt);
1233     //     }
1234
1235         /* do the seek */
1236         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1237         url_fseek(s->pb, pos, SEEK_SET);
1238     }
1239     asf_reset_header(s);
1240     return 0;
1241 }
1242
1243 AVInputFormat ff_asf_demuxer = {
1244     "asf",
1245     NULL_IF_CONFIG_SMALL("ASF format"),
1246     sizeof(ASFContext),
1247     asf_probe,
1248     asf_read_header,
1249     asf_read_packet,
1250     asf_read_close,
1251     asf_read_seek,
1252     asf_read_pts,
1253 };