asfdec: fix a memleak.
[ffmpeg.git] / libavformat / asfdec.c
1 /*
2  * ASF compatible demuxer
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 //#define DEBUG
23
24 #include "libavutil/common.h"
25 #include "libavutil/avstring.h"
26 #include "libavcodec/mpegaudio.h"
27 #include "avformat.h"
28 #include "riff.h"
29 #include "asf.h"
30 #include "asfcrypt.h"
31 #include "avlanguage.h"
32
33 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
34
35 #undef NDEBUG
36 #include <assert.h>
37
38 #define FRAME_HEADER_SIZE 17
39 // Fix Me! FRAME_HEADER_SIZE may be different.
40
41 static const ff_asf_guid index_guid = {
42     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
43 };
44
45 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
46     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
47 };
48 /**********************************/
49 /* decoding */
50
51 static int guidcmp(const void *g1, const void *g2)
52 {
53     return memcmp(g1, g2, sizeof(ff_asf_guid));
54 }
55
56 #ifdef DEBUG
57 #define PRINT_IF_GUID(g,cmp) \
58 if (!guidcmp(g, &cmp)) \
59     dprintf(NULL, "(GUID: %s) ", #cmp)
60
61 static void print_guid(const ff_asf_guid *g)
62 {
63     int i;
64     PRINT_IF_GUID(g, ff_asf_header);
65     else PRINT_IF_GUID(g, ff_asf_file_header);
66     else PRINT_IF_GUID(g, ff_asf_stream_header);
67     else PRINT_IF_GUID(g, ff_asf_audio_stream);
68     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
69     else PRINT_IF_GUID(g, ff_asf_video_stream);
70     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
71     else PRINT_IF_GUID(g, ff_asf_command_stream);
72     else PRINT_IF_GUID(g, ff_asf_comment_header);
73     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
74     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
75     else PRINT_IF_GUID(g, ff_asf_data_header);
76     else PRINT_IF_GUID(g, index_guid);
77     else PRINT_IF_GUID(g, ff_asf_head1_guid);
78     else PRINT_IF_GUID(g, ff_asf_head2_guid);
79     else PRINT_IF_GUID(g, ff_asf_my_guid);
80     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
81     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
82     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
83     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
84     else PRINT_IF_GUID(g, ff_asf_metadata_header);
85     else PRINT_IF_GUID(g, stream_bitrate_guid);
86     else PRINT_IF_GUID(g, ff_asf_language_guid);
87     else
88         dprintf(NULL, "(GUID: unknown) ");
89     for(i=0;i<16;i++)
90         dprintf(NULL, " 0x%02x,", (*g)[i]);
91     dprintf(NULL, "}\n");
92 }
93 #undef PRINT_IF_GUID
94 #else
95 #define print_guid(g)
96 #endif
97
98 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
99 {
100     assert(sizeof(*g) == 16);
101     get_buffer(s, *g, sizeof(*g));
102 }
103
104 #if 0
105 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
106 {
107     int len, c;
108     char *q;
109
110     len = get_le16(pb);
111     q = buf;
112     while (len > 0) {
113         c = get_le16(pb);
114         if ((q - buf) < buf_size - 1)
115             *q++ = c;
116         len--;
117     }
118     *q = '\0';
119 }
120 #endif
121
122 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
123 {
124     char* q = buf;
125     for (; len > 1; len -= 2) {
126         uint8_t tmp;
127         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
128     }
129     if (len > 0)
130         url_fskip(pb, len);
131     *q = '\0';
132 }
133
134 static int asf_probe(AVProbeData *pd)
135 {
136     /* check file header */
137     if (!guidcmp(pd->buf, &ff_asf_header))
138         return AVPROBE_SCORE_MAX;
139     else
140         return 0;
141 }
142
143 static int get_value(ByteIOContext *pb, int type){
144     switch(type){
145         case 2: return get_le32(pb);
146         case 3: return get_le32(pb);
147         case 4: return get_le64(pb);
148         case 5: return get_le16(pb);
149         default:return INT_MIN;
150     }
151 }
152
153 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
154 {
155     char *value;
156
157     if ((unsigned)len >= UINT_MAX)
158         return;
159
160     value = av_malloc(len+1);
161     if (!value)
162         return;
163
164     if (type <= 1) {         // unicode or byte
165         get_str16_nolen(s->pb, len, value, len);
166     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
167         uint64_t num = get_value(s->pb, type);
168         snprintf(value, len, "%"PRIu64, num);
169     } else {
170         url_fskip(s->pb, len);
171         av_freep(&value);
172         return;
173     }
174     if (!strncmp(key, "WM/", 3))
175         key += 3;
176     av_metadata_set2(&s->metadata, key, value, AV_METADATA_DONT_STRDUP_VAL);
177 }
178
179 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
180 {
181     ASFContext *asf = s->priv_data;
182     ff_asf_guid g;
183     ByteIOContext *pb = s->pb;
184     AVStream *st;
185     ASFStream *asf_st;
186     int size, i;
187     int64_t gsize;
188     AVRational dar[128];
189     uint32_t bitrate[128];
190
191     memset(dar, 0, sizeof(dar));
192     memset(bitrate, 0, sizeof(bitrate));
193
194     get_guid(pb, &g);
195     if (guidcmp(&g, &ff_asf_header))
196         return -1;
197     get_le64(pb);
198     get_le32(pb);
199     get_byte(pb);
200     get_byte(pb);
201     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
202     for(;;) {
203         get_guid(pb, &g);
204         gsize = get_le64(pb);
205         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
206         print_guid(&g);
207         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
208         if (!guidcmp(&g, &ff_asf_data_header)) {
209             asf->data_object_offset = url_ftell(pb);
210             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
211             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
212                 asf->data_object_size = gsize - 24;
213             } else {
214                 asf->data_object_size = (uint64_t)-1;
215             }
216             break;
217         }
218         if (gsize < 24)
219             return -1;
220         if (!guidcmp(&g, &ff_asf_file_header)) {
221             get_guid(pb, &asf->hdr.guid);
222             asf->hdr.file_size          = get_le64(pb);
223             asf->hdr.create_time        = get_le64(pb);
224             asf->nb_packets             = get_le64(pb);
225             asf->hdr.play_time          = get_le64(pb);
226             asf->hdr.send_time          = get_le64(pb);
227             asf->hdr.preroll            = get_le32(pb);
228             asf->hdr.ignore             = get_le32(pb);
229             asf->hdr.flags              = get_le32(pb);
230             asf->hdr.min_pktsize        = get_le32(pb);
231             asf->hdr.max_pktsize        = get_le32(pb);
232             asf->hdr.max_bitrate        = get_le32(pb);
233             s->packet_size = asf->hdr.max_pktsize;
234         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
235             enum CodecType type;
236             int type_specific_size, sizeX;
237             uint64_t total_size;
238             unsigned int tag1;
239             int64_t pos1, pos2, start_time;
240             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
241
242             pos1 = url_ftell(pb);
243
244             st = av_new_stream(s, 0);
245             if (!st)
246                 return AVERROR(ENOMEM);
247             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
248             asf_st = av_mallocz(sizeof(ASFStream));
249             if (!asf_st)
250                 return AVERROR(ENOMEM);
251             st->priv_data = asf_st;
252             start_time = asf->hdr.preroll;
253
254             asf_st->stream_language_index = 128; // invalid stream index means no language info
255
256             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
257                 st->duration = asf->hdr.play_time /
258                     (10000000 / 1000) - start_time;
259             }
260             get_guid(pb, &g);
261
262             test_for_ext_stream_audio = 0;
263             if (!guidcmp(&g, &ff_asf_audio_stream)) {
264                 type = CODEC_TYPE_AUDIO;
265             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
266                 type = CODEC_TYPE_VIDEO;
267             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
268                 type = CODEC_TYPE_DATA;
269             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
270                 test_for_ext_stream_audio = 1;
271                 type = CODEC_TYPE_UNKNOWN;
272             } else {
273                 return -1;
274             }
275             get_guid(pb, &g);
276             total_size = get_le64(pb);
277             type_specific_size = get_le32(pb);
278             get_le32(pb);
279             st->id = get_le16(pb) & 0x7f; /* stream id */
280             // mapping of asf ID to AV stream ID;
281             asf->asfid2avid[st->id] = s->nb_streams - 1;
282
283             get_le32(pb);
284
285             if (test_for_ext_stream_audio) {
286                 get_guid(pb, &g);
287                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
288                     type = CODEC_TYPE_AUDIO;
289                     is_dvr_ms_audio=1;
290                     get_guid(pb, &g);
291                     get_le32(pb);
292                     get_le32(pb);
293                     get_le32(pb);
294                     get_guid(pb, &g);
295                     get_le32(pb);
296                 }
297             }
298
299             st->codec->codec_type = type;
300             if (type == CODEC_TYPE_AUDIO) {
301                 ff_get_wav_header(pb, st->codec, type_specific_size);
302                 if (is_dvr_ms_audio) {
303                     // codec_id and codec_tag are unreliable in dvr_ms
304                     // files. Set them later by probing stream.
305                     st->codec->codec_id = CODEC_ID_PROBE;
306                     st->codec->codec_tag = 0;
307                 }
308                 if (st->codec->codec_id == CODEC_ID_AAC) {
309                     st->need_parsing = AVSTREAM_PARSE_NONE;
310                 } else {
311                     st->need_parsing = AVSTREAM_PARSE_FULL;
312                 }
313                 /* We have to init the frame size at some point .... */
314                 pos2 = url_ftell(pb);
315                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
316                     asf_st->ds_span = get_byte(pb);
317                     asf_st->ds_packet_size = get_le16(pb);
318                     asf_st->ds_chunk_size = get_le16(pb);
319                     get_le16(pb); //ds_data_size
320                     get_byte(pb); //ds_silence_data
321                 }
322                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
323                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
324                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
325                 if (asf_st->ds_span > 1) {
326                     if (!asf_st->ds_chunk_size
327                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
328                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
329                         asf_st->ds_span = 0; // disable descrambling
330                 }
331                 switch (st->codec->codec_id) {
332                 case CODEC_ID_MP3:
333                     st->codec->frame_size = MPA_FRAME_SIZE;
334                     break;
335                 case CODEC_ID_PCM_S16LE:
336                 case CODEC_ID_PCM_S16BE:
337                 case CODEC_ID_PCM_U16LE:
338                 case CODEC_ID_PCM_U16BE:
339                 case CODEC_ID_PCM_S8:
340                 case CODEC_ID_PCM_U8:
341                 case CODEC_ID_PCM_ALAW:
342                 case CODEC_ID_PCM_MULAW:
343                     st->codec->frame_size = 1;
344                     break;
345                 default:
346                     /* This is probably wrong, but it prevents a crash later */
347                     st->codec->frame_size = 1;
348                     break;
349                 }
350             } else if (type == CODEC_TYPE_VIDEO) {
351                 get_le32(pb);
352                 get_le32(pb);
353                 get_byte(pb);
354                 size = get_le16(pb); /* size */
355                 sizeX= get_le32(pb); /* size */
356                 st->codec->width = get_le32(pb);
357                 st->codec->height = get_le32(pb);
358                 /* not available for asf */
359                 get_le16(pb); /* panes */
360                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
361                 tag1 = get_le32(pb);
362                 url_fskip(pb, 20);
363 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
364                 size= sizeX;
365                 if (size > 40) {
366                     st->codec->extradata_size = size - 40;
367                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
368                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
369                 }
370
371                 /* Extract palette from extradata if bpp <= 8 */
372                 /* This code assumes that extradata contains only palette */
373                 /* This is true for all paletted codecs implemented in ffmpeg */
374                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
375                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
376 #if HAVE_BIGENDIAN
377                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
378                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
379 #else
380                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
381                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
382 #endif
383                     st->codec->palctrl->palette_changed = 1;
384                 }
385
386                 st->codec->codec_tag = tag1;
387                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
388                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
389                     st->need_parsing = AVSTREAM_PARSE_FULL;
390             }
391             pos2 = url_ftell(pb);
392             url_fskip(pb, gsize - (pos2 - pos1 + 24));
393         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
394             int len1, len2, len3, len4, len5;
395
396             len1 = get_le16(pb);
397             len2 = get_le16(pb);
398             len3 = get_le16(pb);
399             len4 = get_le16(pb);
400             len5 = get_le16(pb);
401             get_tag(s, "title"    , 0, len1);
402             get_tag(s, "author"   , 0, len2);
403             get_tag(s, "copyright", 0, len3);
404             get_tag(s, "comment"  , 0, len4);
405             url_fskip(pb, len5);
406         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
407             int stream_count = get_le16(pb);
408             int j;
409
410 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
411 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
412             for(j = 0; j < stream_count; j++) {
413                 int flags, bitrate, stream_id;
414
415                 flags= get_le16(pb);
416                 bitrate= get_le32(pb);
417                 stream_id= (flags & 0x7f);
418 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
419                 asf->stream_bitrates[stream_id]= bitrate;
420             }
421         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
422             int j;
423             int stream_count = get_le16(pb);
424             for(j = 0; j < stream_count; j++) {
425                 char lang[6];
426                 unsigned int lang_len = get_byte(pb);
427                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
428                 if (j < 128)
429                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
430             }
431         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
432             int desc_count, i;
433
434             desc_count = get_le16(pb);
435             for(i=0;i<desc_count;i++) {
436                     int name_len,value_type,value_len;
437                     char name[1024];
438
439                     name_len = get_le16(pb);
440                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
441                         name_len += 1;
442                     get_str16_nolen(pb, name_len, name, sizeof(name));
443                     value_type = get_le16(pb);
444                     value_len  = get_le16(pb);
445                     if (!value_type && value_len%2)
446                         value_len += 1;
447                     get_tag(s, name, value_type, value_len);
448             }
449         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
450             int n, stream_num, name_len, value_len, value_type, value_num;
451             n = get_le16(pb);
452
453             for(i=0;i<n;i++) {
454                 char name[1024];
455
456                 get_le16(pb); //lang_list_index
457                 stream_num= get_le16(pb);
458                 name_len=   get_le16(pb);
459                 value_type= get_le16(pb);
460                 value_len=  get_le32(pb);
461
462                 get_str16_nolen(pb, name_len, name, sizeof(name));
463 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
464                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
465                 url_fskip(pb, value_len - 2);
466
467                 if(stream_num<128){
468                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
469                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
470                 }
471             }
472         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
473             int ext_len, payload_ext_ct, stream_ct;
474             uint32_t ext_d, leak_rate, stream_num;
475             unsigned int stream_languageid_index;
476
477             get_le64(pb); // starttime
478             get_le64(pb); // endtime
479             leak_rate = get_le32(pb); // leak-datarate
480             get_le32(pb); // bucket-datasize
481             get_le32(pb); // init-bucket-fullness
482             get_le32(pb); // alt-leak-datarate
483             get_le32(pb); // alt-bucket-datasize
484             get_le32(pb); // alt-init-bucket-fullness
485             get_le32(pb); // max-object-size
486             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
487             stream_num = get_le16(pb); // stream-num
488
489             stream_languageid_index = get_le16(pb); // stream-language-id-index
490             if (stream_num < 128)
491                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
492
493             get_le64(pb); // avg frametime in 100ns units
494             stream_ct = get_le16(pb); //stream-name-count
495             payload_ext_ct = get_le16(pb); //payload-extension-system-count
496
497             if (stream_num < 128)
498                 bitrate[stream_num] = leak_rate;
499
500             for (i=0; i<stream_ct; i++){
501                 get_le16(pb);
502                 ext_len = get_le16(pb);
503                 url_fseek(pb, ext_len, SEEK_CUR);
504             }
505
506             for (i=0; i<payload_ext_ct; i++){
507                 get_guid(pb, &g);
508                 ext_d=get_le16(pb);
509                 ext_len=get_le32(pb);
510                 url_fseek(pb, ext_len, SEEK_CUR);
511             }
512
513             // there could be a optional stream properties object to follow
514             // if so the next iteration will pick it up
515         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
516             int v1, v2;
517             get_guid(pb, &g);
518             v1 = get_le32(pb);
519             v2 = get_le16(pb);
520 #if 0
521         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
522             int len, v1, n, num;
523             char str[256], *q;
524             char tag[16];
525
526             get_guid(pb, &g);
527             print_guid(&g);
528
529             n = get_le32(pb);
530             for(i=0;i<n;i++) {
531                 num = get_le16(pb); /* stream number */
532                 get_str16(pb, str, sizeof(str));
533                 get_str16(pb, str, sizeof(str));
534                 len = get_le16(pb);
535                 q = tag;
536                 while (len > 0) {
537                     v1 = get_byte(pb);
538                     if ((q - tag) < sizeof(tag) - 1)
539                         *q++ = v1;
540                     len--;
541                 }
542                 *q = '\0';
543             }
544 #endif
545         } else if (url_feof(pb)) {
546             return -1;
547         } else {
548             if (!s->keylen) {
549                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
550                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
551                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
552                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
553                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
554                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
555                 }
556             }
557             url_fseek(pb, gsize - 24, SEEK_CUR);
558         }
559     }
560     get_guid(pb, &g);
561     get_le64(pb);
562     get_byte(pb);
563     get_byte(pb);
564     if (url_feof(pb))
565         return -1;
566     asf->data_offset = url_ftell(pb);
567     asf->packet_size_left = 0;
568
569
570     for(i=0; i<128; i++){
571         int stream_num= asf->asfid2avid[i];
572         if(stream_num>=0){
573             AVStream *st = s->streams[stream_num];
574             if (!st->codec->bit_rate)
575                 st->codec->bit_rate = bitrate[i];
576             if (dar[i].num > 0 && dar[i].den > 0)
577                 av_reduce(&st->sample_aspect_ratio.num,
578                           &st->sample_aspect_ratio.den,
579                           dar[i].num, dar[i].den, INT_MAX);
580 //av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
581
582             // copy and convert language codes to the frontend
583             if (asf->streams[i].stream_language_index < 128) {
584                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
585                 if (rfc1766 && strlen(rfc1766) > 1) {
586                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
587                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
588                     if (iso6392)
589                         av_metadata_set(&st->metadata, "language", iso6392);
590                 }
591             }
592         }
593     }
594
595     return 0;
596 }
597
598 #define DO_2BITS(bits, var, defval) \
599     switch (bits & 3) \
600     { \
601     case 3: var = get_le32(pb); rsize += 4; break; \
602     case 2: var = get_le16(pb); rsize += 2; break; \
603     case 1: var = get_byte(pb); rsize++; break; \
604     default: var = defval; break; \
605     }
606
607 /**
608  * Load a single ASF packet into the demuxer.
609  * @param s demux context
610  * @param pb context to read data from
611  * @returns 0 on success, <0 on error
612  */
613 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
614 {
615     ASFContext *asf = s->priv_data;
616     uint32_t packet_length, padsize;
617     int rsize = 8;
618     int c, d, e, off;
619
620     // if we do not know packet size, allow skipping up to 32 kB
621     off= 32768;
622     if (s->packet_size > 0)
623         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
624
625     c=d=e=-1;
626     while(off-- > 0){
627         c=d; d=e;
628         e= get_byte(pb);
629         if(c == 0x82 && !d && !e)
630             break;
631     }
632
633     if (c != 0x82) {
634         /**
635          * This code allows handling of -EAGAIN at packet boundaries (i.e.
636          * if the packet sync code above triggers -EAGAIN). This does not
637          * imply complete -EAGAIN handling support at random positions in
638          * the stream.
639          */
640         if (url_ferror(pb) == AVERROR(EAGAIN))
641             return AVERROR(EAGAIN);
642         if (!url_feof(pb))
643             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
644     }
645     if ((c & 0x8f) == 0x82) {
646         if (d || e) {
647             if (!url_feof(pb))
648                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
649             return -1;
650         }
651         c= get_byte(pb);
652         d= get_byte(pb);
653         rsize+=3;
654     }else{
655         url_fseek(pb, -1, SEEK_CUR); //FIXME
656     }
657
658     asf->packet_flags    = c;
659     asf->packet_property = d;
660
661     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
662     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
663     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
664
665     //the following checks prevent overflows and infinite loops
666     if(!packet_length || packet_length >= (1U<<29)){
667         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
668         return -1;
669     }
670     if(padsize >= packet_length){
671         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
672         return -1;
673     }
674
675     asf->packet_timestamp = get_le32(pb);
676     get_le16(pb); /* duration */
677     // rsize has at least 11 bytes which have to be present
678
679     if (asf->packet_flags & 0x01) {
680         asf->packet_segsizetype = get_byte(pb); rsize++;
681         asf->packet_segments = asf->packet_segsizetype & 0x3f;
682     } else {
683         asf->packet_segments = 1;
684         asf->packet_segsizetype = 0x80;
685     }
686     asf->packet_size_left = packet_length - padsize - rsize;
687     if (packet_length < asf->hdr.min_pktsize)
688         padsize += asf->hdr.min_pktsize - packet_length;
689     asf->packet_padsize = padsize;
690     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
691     return 0;
692 }
693
694 /**
695  *
696  * @return <0 if error
697  */
698 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
699     ASFContext *asf = s->priv_data;
700     int rsize = 1;
701     int num = get_byte(pb);
702     int64_t ts0, ts1;
703
704     asf->packet_segments--;
705     asf->packet_key_frame = num >> 7;
706     asf->stream_index = asf->asfid2avid[num & 0x7f];
707     // sequence should be ignored!
708     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
709     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
710     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
711 //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);
712     if (asf->packet_replic_size >= 8) {
713         asf->packet_obj_size = get_le32(pb);
714         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
715             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
716             return -1;
717         }
718         asf->packet_frag_timestamp = get_le32(pb); // timestamp
719         if(asf->packet_replic_size >= 8+38+4){
720 //            for(i=0; i<asf->packet_replic_size-8; i++)
721 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
722 //            av_log(s, AV_LOG_DEBUG, "\n");
723             url_fskip(pb, 10);
724             ts0= get_le64(pb);
725             ts1= get_le64(pb);
726             url_fskip(pb, 12);
727             get_le32(pb);
728             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
729             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
730             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
731         }else
732             url_fskip(pb, asf->packet_replic_size - 8);
733         rsize += asf->packet_replic_size; // FIXME - check validity
734     } else if (asf->packet_replic_size==1){
735         // multipacket - frag_offset is beginning timestamp
736         asf->packet_time_start = asf->packet_frag_offset;
737         asf->packet_frag_offset = 0;
738         asf->packet_frag_timestamp = asf->packet_timestamp;
739
740         asf->packet_time_delta = get_byte(pb);
741         rsize++;
742     }else if(asf->packet_replic_size!=0){
743         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
744         return -1;
745     }
746     if (asf->packet_flags & 0x01) {
747         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
748         if(asf->packet_frag_size > asf->packet_size_left - rsize){
749             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
750             return -1;
751         }
752         //printf("Fragsize %d\n", asf->packet_frag_size);
753     } else {
754         asf->packet_frag_size = asf->packet_size_left - rsize;
755         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
756     }
757     if (asf->packet_replic_size == 1) {
758         asf->packet_multi_size = asf->packet_frag_size;
759         if (asf->packet_multi_size > asf->packet_size_left)
760             return -1;
761     }
762     asf->packet_size_left -= rsize;
763     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
764
765     return 0;
766 }
767
768 /**
769  * Parse data from individual ASF packets (which were previously loaded
770  * with asf_get_packet()).
771  * @param s demux context
772  * @param pb context to read data from
773  * @param pkt pointer to store packet data into
774  * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
775  *          packets need to be loaded (through asf_get_packet())
776  */
777 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
778 {
779     ASFContext *asf = s->priv_data;
780     ASFStream *asf_st = 0;
781     for (;;) {
782         if(url_feof(pb))
783             return AVERROR_EOF;
784         if (asf->packet_size_left < FRAME_HEADER_SIZE
785             || asf->packet_segments < 1) {
786             //asf->packet_size_left <= asf->packet_padsize) {
787             int ret = asf->packet_size_left + asf->packet_padsize;
788             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
789             assert(ret>=0);
790             /* fail safe */
791             url_fskip(pb, ret);
792
793             asf->packet_pos= url_ftell(pb);
794             if (asf->data_object_size != (uint64_t)-1 &&
795                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
796                 return AVERROR_EOF; /* Do not exceed the size of the data object */
797             return 1;
798         }
799         if (asf->packet_time_start == 0) {
800             if(asf_read_frame_header(s, pb) < 0){
801                 asf->packet_segments= 0;
802                 continue;
803             }
804             if (asf->stream_index < 0
805                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
806                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
807                 ) {
808                 asf->packet_time_start = 0;
809                 /* unhandled packet (should not happen) */
810                 url_fskip(pb, asf->packet_frag_size);
811                 asf->packet_size_left -= asf->packet_frag_size;
812                 if(asf->stream_index < 0)
813                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
814                 continue;
815             }
816             asf->asf_st = s->streams[asf->stream_index]->priv_data;
817         }
818         asf_st = asf->asf_st;
819
820         if (asf->packet_replic_size == 1) {
821             // frag_offset is here used as the beginning timestamp
822             asf->packet_frag_timestamp = asf->packet_time_start;
823             asf->packet_time_start += asf->packet_time_delta;
824             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
825             asf->packet_size_left--;
826             asf->packet_multi_size--;
827             if (asf->packet_multi_size < asf->packet_obj_size)
828             {
829                 asf->packet_time_start = 0;
830                 url_fskip(pb, asf->packet_multi_size);
831                 asf->packet_size_left -= asf->packet_multi_size;
832                 continue;
833             }
834             asf->packet_multi_size -= asf->packet_obj_size;
835             //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);
836         }
837         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
838               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
839            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
840             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
841                 asf_st->frag_offset, asf->packet_frag_size,
842                 asf->packet_obj_size, asf_st->pkt.size);
843             asf->packet_obj_size= asf_st->pkt.size;
844         }
845
846         if (   asf_st->pkt.size != asf->packet_obj_size
847             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
848             if(asf_st->pkt.data){
849                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
850                 asf_st->frag_offset = 0;
851                 av_free_packet(&asf_st->pkt);
852             }
853             /* new packet */
854             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
855             asf_st->seq = asf->packet_seq;
856             asf_st->pkt.dts = asf->packet_frag_timestamp;
857             asf_st->pkt.stream_index = asf->stream_index;
858             asf_st->pkt.pos =
859             asf_st->packet_pos= asf->packet_pos;
860 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
861 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
862 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
863             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
864                 asf->packet_key_frame = 1;
865             if (asf->packet_key_frame)
866                 asf_st->pkt.flags |= PKT_FLAG_KEY;
867         }
868
869         /* read data */
870         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
871         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
872         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
873         asf->packet_size_left -= asf->packet_frag_size;
874         if (asf->packet_size_left < 0)
875             continue;
876
877         if(   asf->packet_frag_offset >= asf_st->pkt.size
878            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
879             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
880                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
881             continue;
882         }
883
884         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
885                    asf->packet_frag_size);
886         if (s->key && s->keylen == 20)
887             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
888                             asf->packet_frag_size);
889         asf_st->frag_offset += asf->packet_frag_size;
890         /* test if whole packet is read */
891         if (asf_st->frag_offset == asf_st->pkt.size) {
892             //workaround for macroshit radio DVR-MS files
893             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
894                && asf_st->pkt.size > 100){
895                 int i;
896                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
897                 if(i == asf_st->pkt.size){
898                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
899                     asf_st->frag_offset = 0;
900                     av_free_packet(&asf_st->pkt);
901                     continue;
902                 }
903             }
904
905             /* return packet */
906             if (asf_st->ds_span > 1) {
907               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
908                     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);
909               }else{
910                 /* packet descrambling */
911                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
912                 if (newdata) {
913                     int offset = 0;
914                     while (offset < asf_st->pkt.size) {
915                         int off = offset / asf_st->ds_chunk_size;
916                         int row = off / asf_st->ds_span;
917                         int col = off % asf_st->ds_span;
918                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
919                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
920
921                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
922                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
923                         memcpy(newdata + offset,
924                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
925                                asf_st->ds_chunk_size);
926                         offset += asf_st->ds_chunk_size;
927                     }
928                     av_free(asf_st->pkt.data);
929                     asf_st->pkt.data = newdata;
930                 }
931               }
932             }
933             asf_st->frag_offset = 0;
934             *pkt= asf_st->pkt;
935             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
936             asf_st->pkt.size = 0;
937             asf_st->pkt.data = 0;
938             break; // packet completed
939         }
940     }
941     return 0;
942 }
943
944 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
945 {
946     ASFContext *asf = s->priv_data;
947
948     for (;;) {
949         int ret;
950
951         /* parse cached packets, if any */
952         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
953             return ret;
954         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
955             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
956         asf->packet_time_start = 0;
957     }
958
959     return 0;
960 }
961
962 // Added to support seeking after packets have been read
963 // If information is not reset, read_packet fails due to
964 // leftover information from previous reads
965 static void asf_reset_header(AVFormatContext *s)
966 {
967     ASFContext *asf = s->priv_data;
968     ASFStream *asf_st;
969     int i;
970
971     asf->packet_nb_frames = 0;
972     asf->packet_size_left = 0;
973     asf->packet_segments = 0;
974     asf->packet_flags = 0;
975     asf->packet_property = 0;
976     asf->packet_timestamp = 0;
977     asf->packet_segsizetype = 0;
978     asf->packet_segments = 0;
979     asf->packet_seq = 0;
980     asf->packet_replic_size = 0;
981     asf->packet_key_frame = 0;
982     asf->packet_padsize = 0;
983     asf->packet_frag_offset = 0;
984     asf->packet_frag_size = 0;
985     asf->packet_frag_timestamp = 0;
986     asf->packet_multi_size = 0;
987     asf->packet_obj_size = 0;
988     asf->packet_time_delta = 0;
989     asf->packet_time_start = 0;
990
991     for(i=0; i<s->nb_streams; i++){
992         asf_st= s->streams[i]->priv_data;
993         av_free_packet(&asf_st->pkt);
994         asf_st->frag_offset=0;
995         asf_st->seq=0;
996     }
997     asf->asf_st= NULL;
998 }
999
1000 static int asf_read_close(AVFormatContext *s)
1001 {
1002     int i;
1003
1004     asf_reset_header(s);
1005     for(i=0;i<s->nb_streams;i++) {
1006         AVStream *st = s->streams[i];
1007         av_free(st->codec->palctrl);
1008     }
1009     return 0;
1010 }
1011
1012 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1013 {
1014     AVPacket pkt1, *pkt = &pkt1;
1015     ASFStream *asf_st;
1016     int64_t pts;
1017     int64_t pos= *ppos;
1018     int i;
1019     int64_t start_pos[s->nb_streams];
1020
1021     for(i=0; i<s->nb_streams; i++){
1022         start_pos[i]= pos;
1023     }
1024
1025     if (s->packet_size > 0)
1026         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1027     *ppos= pos;
1028     url_fseek(s->pb, pos, SEEK_SET);
1029
1030 //printf("asf_read_pts\n");
1031     asf_reset_header(s);
1032     for(;;){
1033         if (av_read_frame(s, pkt) < 0){
1034             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1035             return AV_NOPTS_VALUE;
1036         }
1037
1038         pts= pkt->pts;
1039
1040         av_free_packet(pkt);
1041         if(pkt->flags&PKT_FLAG_KEY){
1042             i= pkt->stream_index;
1043
1044             asf_st= s->streams[i]->priv_data;
1045
1046 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1047             pos= asf_st->packet_pos;
1048
1049             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1050             start_pos[i]= asf_st->packet_pos + 1;
1051
1052             if(pkt->stream_index == stream_index)
1053                break;
1054         }
1055     }
1056
1057     *ppos= pos;
1058 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1059
1060     return pts;
1061 }
1062
1063 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1064 {
1065     ff_asf_guid g;
1066     ASFContext *asf = s->priv_data;
1067     int64_t current_pos= url_ftell(s->pb);
1068     int i;
1069
1070     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1071     get_guid(s->pb, &g);
1072     if (!guidcmp(&g, &index_guid)) {
1073         int64_t itime, last_pos=-1;
1074         int pct, ict;
1075         int64_t av_unused gsize= get_le64(s->pb);
1076         get_guid(s->pb, &g);
1077         itime=get_le64(s->pb);
1078         pct=get_le32(s->pb);
1079         ict=get_le32(s->pb);
1080         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1081
1082         for (i=0;i<ict;i++){
1083             int pktnum=get_le32(s->pb);
1084             int pktct =get_le16(s->pb);
1085             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1086             int64_t index_pts= av_rescale(itime, i, 10000);
1087
1088             if(pos != last_pos){
1089             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1090             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1091             last_pos=pos;
1092             }
1093         }
1094         asf->index_read= 1;
1095     }
1096     url_fseek(s->pb, current_pos, SEEK_SET);
1097 }
1098
1099 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1100 {
1101     ASFContext *asf = s->priv_data;
1102     AVStream *st = s->streams[stream_index];
1103     int64_t pos;
1104     int index;
1105
1106     if (s->packet_size <= 0)
1107         return -1;
1108
1109     /* Try using the protocol's read_seek if available */
1110     if(s->pb) {
1111         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1112         if(ret >= 0)
1113             asf_reset_header(s);
1114         if (ret != AVERROR(ENOSYS))
1115             return ret;
1116     }
1117
1118     if (!asf->index_read)
1119         asf_build_simple_index(s, stream_index);
1120
1121     if(!(asf->index_read && st->index_entries)){
1122         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1123             return -1;
1124     }else{
1125         index= av_index_search_timestamp(st, pts, flags);
1126         if(index<0)
1127             return -1;
1128
1129         /* find the position */
1130         pos = st->index_entries[index].pos;
1131
1132     // various attempts to find key frame have failed so far
1133     //    asf_reset_header(s);
1134     //    url_fseek(s->pb, pos, SEEK_SET);
1135     //    key_pos = pos;
1136     //     for(i=0;i<16;i++){
1137     //         pos = url_ftell(s->pb);
1138     //         if (av_read_frame(s, &pkt) < 0){
1139     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1140     //             return -1;
1141     //         }
1142     //         asf_st = s->streams[stream_index]->priv_data;
1143     //         pos += st->parser->frame_offset;
1144     //
1145     //         if (pkt.size > b) {
1146     //             b = pkt.size;
1147     //             key_pos = pos;
1148     //         }
1149     //
1150     //         av_free_packet(&pkt);
1151     //     }
1152
1153         /* do the seek */
1154         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1155         url_fseek(s->pb, pos, SEEK_SET);
1156     }
1157     asf_reset_header(s);
1158     return 0;
1159 }
1160
1161 AVInputFormat asf_demuxer = {
1162     "asf",
1163     NULL_IF_CONFIG_SMALL("ASF format"),
1164     sizeof(ASFContext),
1165     asf_probe,
1166     asf_read_header,
1167     asf_read_packet,
1168     asf_read_close,
1169     asf_read_seek,
1170     asf_read_pts,
1171     .metadata_conv = ff_asf_metadata_conv,
1172 };