Return an error when get_buffer reads none or only partial data instead
[ffmpeg.git] / libavformat / asfdec.c
1 /*
2  * ASF compatible demuxer
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 //#define DEBUG
23
24 #include "libavutil/common.h"
25 #include "libavutil/avstring.h"
26 #include "libavcodec/mpegaudio.h"
27 #include "avformat.h"
28 #include "riff.h"
29 #include "asf.h"
30 #include "asfcrypt.h"
31 #include "avlanguage.h"
32
33 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
34
35 #undef NDEBUG
36 #include <assert.h>
37
38 #define ASF_MAX_STREAMS 127
39 #define FRAME_HEADER_SIZE 17
40 // Fix Me! FRAME_HEADER_SIZE may be different.
41
42 static const ff_asf_guid index_guid = {
43     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
44 };
45
46 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
47     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
48 };
49 /**********************************/
50 /* decoding */
51
52 static int guidcmp(const void *g1, const void *g2)
53 {
54     return memcmp(g1, g2, sizeof(ff_asf_guid));
55 }
56
57 #ifdef DEBUG
58 #define PRINT_IF_GUID(g,cmp) \
59 if (!guidcmp(g, &cmp)) \
60     dprintf(NULL, "(GUID: %s) ", #cmp)
61
62 static void print_guid(const ff_asf_guid *g)
63 {
64     int i;
65     PRINT_IF_GUID(g, ff_asf_header);
66     else PRINT_IF_GUID(g, ff_asf_file_header);
67     else PRINT_IF_GUID(g, ff_asf_stream_header);
68     else PRINT_IF_GUID(g, ff_asf_audio_stream);
69     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
70     else PRINT_IF_GUID(g, ff_asf_video_stream);
71     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
72     else PRINT_IF_GUID(g, ff_asf_command_stream);
73     else PRINT_IF_GUID(g, ff_asf_comment_header);
74     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
75     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
76     else PRINT_IF_GUID(g, ff_asf_data_header);
77     else PRINT_IF_GUID(g, index_guid);
78     else PRINT_IF_GUID(g, ff_asf_head1_guid);
79     else PRINT_IF_GUID(g, ff_asf_head2_guid);
80     else PRINT_IF_GUID(g, ff_asf_my_guid);
81     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
82     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
83     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
84     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
85     else PRINT_IF_GUID(g, ff_asf_metadata_header);
86     else PRINT_IF_GUID(g, ff_asf_marker_header);
87     else PRINT_IF_GUID(g, stream_bitrate_guid);
88     else PRINT_IF_GUID(g, ff_asf_language_guid);
89     else
90         dprintf(NULL, "(GUID: unknown) ");
91     for(i=0;i<16;i++)
92         dprintf(NULL, " 0x%02x,", (*g)[i]);
93     dprintf(NULL, "}\n");
94 }
95 #undef PRINT_IF_GUID
96 #else
97 #define print_guid(g)
98 #endif
99
100 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
101 {
102     assert(sizeof(*g) == 16);
103     get_buffer(s, *g, sizeof(*g));
104 }
105
106 #if 0
107 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
108 {
109     int len, c;
110     char *q;
111
112     len = get_le16(pb);
113     q = buf;
114     while (len > 0) {
115         c = get_le16(pb);
116         if ((q - buf) < buf_size - 1)
117             *q++ = c;
118         len--;
119     }
120     *q = '\0';
121 }
122 #endif
123
124 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
125 {
126     char* q = buf;
127     while (len > 1) {
128         uint8_t tmp;
129         uint32_t ch;
130
131         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
132         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
133     }
134     if (len > 0)
135         url_fskip(pb, len);
136     *q = '\0';
137 }
138
139 static int asf_probe(AVProbeData *pd)
140 {
141     /* check file header */
142     if (!guidcmp(pd->buf, &ff_asf_header))
143         return AVPROBE_SCORE_MAX;
144     else
145         return 0;
146 }
147
148 static int get_value(ByteIOContext *pb, int type){
149     switch(type){
150         case 2: return get_le32(pb);
151         case 3: return get_le32(pb);
152         case 4: return get_le64(pb);
153         case 5: return get_le16(pb);
154         default:return INT_MIN;
155     }
156 }
157
158 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
159 {
160     char *value;
161
162     if ((unsigned)len >= (UINT_MAX - 1)/2)
163         return;
164
165     value = av_malloc(2*len+1);
166     if (!value)
167         return;
168
169     if (type == 0) {         // UTF16-LE
170         get_str16_nolen(s->pb, len, value, 2*len + 1);
171     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
172         uint64_t num = get_value(s->pb, type);
173         snprintf(value, len, "%"PRIu64, num);
174     } else {
175         url_fskip(s->pb, len);
176         av_freep(&value);
177         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
178         return;
179     }
180     av_metadata_set2(&s->metadata, key, value, 0);
181     av_freep(&value);
182 }
183
184 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
185 {
186     ASFContext *asf = s->priv_data;
187     ff_asf_guid g;
188     ByteIOContext *pb = s->pb;
189     AVStream *st;
190     ASFStream *asf_st;
191     int size, i;
192     int64_t gsize;
193     AVRational dar[128];
194     uint32_t bitrate[128];
195
196     memset(dar, 0, sizeof(dar));
197     memset(bitrate, 0, sizeof(bitrate));
198
199     get_guid(pb, &g);
200     if (guidcmp(&g, &ff_asf_header))
201         return -1;
202     get_le64(pb);
203     get_le32(pb);
204     get_byte(pb);
205     get_byte(pb);
206     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
207     for(;;) {
208         uint64_t gpos= url_ftell(pb);
209         get_guid(pb, &g);
210         gsize = get_le64(pb);
211         dprintf(s, "%08"PRIx64": ", gpos);
212         print_guid(&g);
213         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
214         if (!guidcmp(&g, &ff_asf_data_header)) {
215             asf->data_object_offset = url_ftell(pb);
216             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
217             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
218                 asf->data_object_size = gsize - 24;
219             } else {
220                 asf->data_object_size = (uint64_t)-1;
221             }
222             break;
223         }
224         if (gsize < 24)
225             return -1;
226         if (!guidcmp(&g, &ff_asf_file_header)) {
227             get_guid(pb, &asf->hdr.guid);
228             asf->hdr.file_size          = get_le64(pb);
229             asf->hdr.create_time        = get_le64(pb);
230             asf->nb_packets             = get_le64(pb);
231             asf->hdr.play_time          = get_le64(pb);
232             asf->hdr.send_time          = get_le64(pb);
233             asf->hdr.preroll            = get_le32(pb);
234             asf->hdr.ignore             = get_le32(pb);
235             asf->hdr.flags              = get_le32(pb);
236             asf->hdr.min_pktsize        = get_le32(pb);
237             asf->hdr.max_pktsize        = get_le32(pb);
238             asf->hdr.max_bitrate        = get_le32(pb);
239             s->packet_size = asf->hdr.max_pktsize;
240         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
241             enum AVMediaType type;
242             int type_specific_size, sizeX;
243             uint64_t total_size;
244             unsigned int tag1;
245             int64_t pos1, pos2, start_time;
246             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
247
248             if (s->nb_streams == ASF_MAX_STREAMS) {
249                 av_log(s, AV_LOG_ERROR, "too many streams\n");
250                 return AVERROR(EINVAL);
251             }
252
253             pos1 = url_ftell(pb);
254
255             st = av_new_stream(s, 0);
256             if (!st)
257                 return AVERROR(ENOMEM);
258             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
259             asf_st = av_mallocz(sizeof(ASFStream));
260             if (!asf_st)
261                 return AVERROR(ENOMEM);
262             st->priv_data = asf_st;
263             start_time = asf->hdr.preroll;
264
265             asf_st->stream_language_index = 128; // invalid stream index means no language info
266
267             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
268                 st->duration = asf->hdr.play_time /
269                     (10000000 / 1000) - start_time;
270             }
271             get_guid(pb, &g);
272
273             test_for_ext_stream_audio = 0;
274             if (!guidcmp(&g, &ff_asf_audio_stream)) {
275                 type = AVMEDIA_TYPE_AUDIO;
276             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
277                 type = AVMEDIA_TYPE_VIDEO;
278             } else if (!guidcmp(&g, &ff_asf_jfif_media)) {
279                 type = AVMEDIA_TYPE_VIDEO;
280                 st->codec->codec_id = CODEC_ID_MJPEG;
281             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
282                 type = AVMEDIA_TYPE_DATA;
283             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
284                 test_for_ext_stream_audio = 1;
285                 type = AVMEDIA_TYPE_UNKNOWN;
286             } else {
287                 return -1;
288             }
289             get_guid(pb, &g);
290             total_size = get_le64(pb);
291             type_specific_size = get_le32(pb);
292             get_le32(pb);
293             st->id = get_le16(pb) & 0x7f; /* stream id */
294             // mapping of asf ID to AV stream ID;
295             asf->asfid2avid[st->id] = s->nb_streams - 1;
296
297             get_le32(pb);
298
299             if (test_for_ext_stream_audio) {
300                 get_guid(pb, &g);
301                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
302                     type = AVMEDIA_TYPE_AUDIO;
303                     is_dvr_ms_audio=1;
304                     get_guid(pb, &g);
305                     get_le32(pb);
306                     get_le32(pb);
307                     get_le32(pb);
308                     get_guid(pb, &g);
309                     get_le32(pb);
310                 }
311             }
312
313             st->codec->codec_type = type;
314             if (type == AVMEDIA_TYPE_AUDIO) {
315                 ff_get_wav_header(pb, st->codec, type_specific_size);
316                 if (is_dvr_ms_audio) {
317                     // codec_id and codec_tag are unreliable in dvr_ms
318                     // files. Set them later by probing stream.
319                     st->codec->codec_id = CODEC_ID_PROBE;
320                     st->codec->codec_tag = 0;
321                 }
322                 if (st->codec->codec_id == CODEC_ID_AAC) {
323                     st->need_parsing = AVSTREAM_PARSE_NONE;
324                 } else {
325                     st->need_parsing = AVSTREAM_PARSE_FULL;
326                 }
327                 /* We have to init the frame size at some point .... */
328                 pos2 = url_ftell(pb);
329                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
330                     asf_st->ds_span = get_byte(pb);
331                     asf_st->ds_packet_size = get_le16(pb);
332                     asf_st->ds_chunk_size = get_le16(pb);
333                     get_le16(pb); //ds_data_size
334                     get_byte(pb); //ds_silence_data
335                 }
336                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
337                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
338                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
339                 if (asf_st->ds_span > 1) {
340                     if (!asf_st->ds_chunk_size
341                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
342                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
343                         asf_st->ds_span = 0; // disable descrambling
344                 }
345                 switch (st->codec->codec_id) {
346                 case CODEC_ID_MP3:
347                     st->codec->frame_size = MPA_FRAME_SIZE;
348                     break;
349                 case CODEC_ID_PCM_S16LE:
350                 case CODEC_ID_PCM_S16BE:
351                 case CODEC_ID_PCM_U16LE:
352                 case CODEC_ID_PCM_U16BE:
353                 case CODEC_ID_PCM_S8:
354                 case CODEC_ID_PCM_U8:
355                 case CODEC_ID_PCM_ALAW:
356                 case CODEC_ID_PCM_MULAW:
357                     st->codec->frame_size = 1;
358                     break;
359                 default:
360                     /* This is probably wrong, but it prevents a crash later */
361                     st->codec->frame_size = 1;
362                     break;
363                 }
364             } else if (type == AVMEDIA_TYPE_VIDEO &&
365                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
366                 get_le32(pb);
367                 get_le32(pb);
368                 get_byte(pb);
369                 size = get_le16(pb); /* size */
370                 sizeX= get_le32(pb); /* size */
371                 st->codec->width = get_le32(pb);
372                 st->codec->height = get_le32(pb);
373                 /* not available for asf */
374                 get_le16(pb); /* panes */
375                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
376                 tag1 = get_le32(pb);
377                 url_fskip(pb, 20);
378 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
379                 size= sizeX;
380                 if (size > 40) {
381                     st->codec->extradata_size = size - 40;
382                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
383                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
384                 }
385
386                 /* Extract palette from extradata if bpp <= 8 */
387                 /* This code assumes that extradata contains only palette */
388                 /* This is true for all paletted codecs implemented in ffmpeg */
389                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
390                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
391 #if HAVE_BIGENDIAN
392                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
393                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
394 #else
395                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
396                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
397 #endif
398                     st->codec->palctrl->palette_changed = 1;
399                 }
400
401                 st->codec->codec_tag = tag1;
402                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
403                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
404                     st->need_parsing = AVSTREAM_PARSE_FULL;
405                     // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
406                     st->codec->width  =
407                     st->codec->height = 0;
408                     av_freep(&st->codec->extradata);
409                     st->codec->extradata_size=0;
410                 }
411                 if(st->codec->codec_id == CODEC_ID_H264)
412                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
413             }
414             pos2 = url_ftell(pb);
415             url_fskip(pb, gsize - (pos2 - pos1 + 24));
416         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
417             int len1, len2, len3, len4, len5;
418
419             len1 = get_le16(pb);
420             len2 = get_le16(pb);
421             len3 = get_le16(pb);
422             len4 = get_le16(pb);
423             len5 = get_le16(pb);
424             get_tag(s, "title"    , 0, len1);
425             get_tag(s, "author"   , 0, len2);
426             get_tag(s, "copyright", 0, len3);
427             get_tag(s, "comment"  , 0, len4);
428             url_fskip(pb, len5);
429         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
430             int stream_count = get_le16(pb);
431             int j;
432
433 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
434 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
435             for(j = 0; j < stream_count; j++) {
436                 int flags, bitrate, stream_id;
437
438                 flags= get_le16(pb);
439                 bitrate= get_le32(pb);
440                 stream_id= (flags & 0x7f);
441 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
442                 asf->stream_bitrates[stream_id]= bitrate;
443             }
444         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
445             int j;
446             int stream_count = get_le16(pb);
447             for(j = 0; j < stream_count; j++) {
448                 char lang[6];
449                 unsigned int lang_len = get_byte(pb);
450                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
451                 if (j < 128)
452                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
453             }
454         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
455             int desc_count, i;
456
457             desc_count = get_le16(pb);
458             for(i=0;i<desc_count;i++) {
459                     int name_len,value_type,value_len;
460                     char name[1024];
461
462                     name_len = get_le16(pb);
463                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
464                         name_len += 1;
465                     get_str16_nolen(pb, name_len, name, sizeof(name));
466                     value_type = get_le16(pb);
467                     value_len  = get_le16(pb);
468                     if (!value_type && value_len%2)
469                         value_len += 1;
470                     /**
471                      * My sample has that stream set to 0 maybe that mean the container.
472                      * Asf stream count start at 1. I am using 0 to the container value since it's unused
473                      */
474                     if (!strcmp(name, "AspectRatioX")){
475                         dar[0].num= get_value(s->pb, value_type);
476                     } else if(!strcmp(name, "AspectRatioY")){
477                         dar[0].den= get_value(s->pb, value_type);
478                     } else
479                         get_tag(s, name, value_type, value_len);
480             }
481         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
482             int n, stream_num, name_len, value_len, value_type, value_num;
483             n = get_le16(pb);
484
485             for(i=0;i<n;i++) {
486                 char name[1024];
487
488                 get_le16(pb); //lang_list_index
489                 stream_num= get_le16(pb);
490                 name_len=   get_le16(pb);
491                 value_type= get_le16(pb);
492                 value_len=  get_le32(pb);
493
494                 get_str16_nolen(pb, name_len, name, sizeof(name));
495 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
496                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
497                 url_fskip(pb, value_len - 2);
498
499                 if(stream_num<128){
500                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
501                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
502                 }
503             }
504         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
505             int ext_len, payload_ext_ct, stream_ct;
506             uint32_t ext_d, leak_rate, stream_num;
507             unsigned int stream_languageid_index;
508
509             get_le64(pb); // starttime
510             get_le64(pb); // endtime
511             leak_rate = get_le32(pb); // leak-datarate
512             get_le32(pb); // bucket-datasize
513             get_le32(pb); // init-bucket-fullness
514             get_le32(pb); // alt-leak-datarate
515             get_le32(pb); // alt-bucket-datasize
516             get_le32(pb); // alt-init-bucket-fullness
517             get_le32(pb); // max-object-size
518             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
519             stream_num = get_le16(pb); // stream-num
520
521             stream_languageid_index = get_le16(pb); // stream-language-id-index
522             if (stream_num < 128)
523                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
524
525             get_le64(pb); // avg frametime in 100ns units
526             stream_ct = get_le16(pb); //stream-name-count
527             payload_ext_ct = get_le16(pb); //payload-extension-system-count
528
529             if (stream_num < 128)
530                 bitrate[stream_num] = leak_rate;
531
532             for (i=0; i<stream_ct; i++){
533                 get_le16(pb);
534                 ext_len = get_le16(pb);
535                 url_fseek(pb, ext_len, SEEK_CUR);
536             }
537
538             for (i=0; i<payload_ext_ct; i++){
539                 get_guid(pb, &g);
540                 ext_d=get_le16(pb);
541                 ext_len=get_le32(pb);
542                 url_fseek(pb, ext_len, SEEK_CUR);
543             }
544
545             // there could be a optional stream properties object to follow
546             // if so the next iteration will pick it up
547             continue;
548         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
549             int v1, v2;
550             get_guid(pb, &g);
551             v1 = get_le32(pb);
552             v2 = get_le16(pb);
553             continue;
554         } else if (!guidcmp(&g, &ff_asf_marker_header)) {
555             int i, count, name_len;
556             char name[1024];
557
558             get_le64(pb);            // reserved 16 bytes
559             get_le64(pb);            // ...
560             count = get_le32(pb);    // markers count
561             get_le16(pb);            // reserved 2 bytes
562             name_len = get_le16(pb); // name length
563             for(i=0;i<name_len;i++){
564                 get_byte(pb); // skip the name
565             }
566
567             for(i=0;i<count;i++){
568                 int64_t pres_time;
569                 int name_len;
570
571                 get_le64(pb);             // offset, 8 bytes
572                 pres_time = get_le64(pb); // presentation time
573                 get_le16(pb);             // entry length
574                 get_le32(pb);             // send time
575                 get_le32(pb);             // flags
576                 name_len = get_le32(pb);  // name length
577                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
578                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
579             }
580 #if 0
581         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
582             int len, v1, n, num;
583             char str[256], *q;
584             char tag[16];
585
586             get_guid(pb, &g);
587             print_guid(&g);
588
589             n = get_le32(pb);
590             for(i=0;i<n;i++) {
591                 num = get_le16(pb); /* stream number */
592                 get_str16(pb, str, sizeof(str));
593                 get_str16(pb, str, sizeof(str));
594                 len = get_le16(pb);
595                 q = tag;
596                 while (len > 0) {
597                     v1 = get_byte(pb);
598                     if ((q - tag) < sizeof(tag) - 1)
599                         *q++ = v1;
600                     len--;
601                 }
602                 *q = '\0';
603             }
604 #endif
605         } else if (url_feof(pb)) {
606             return -1;
607         } else {
608             if (!s->keylen) {
609                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
610                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
611                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
612                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
613                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
614                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
615                 }
616             }
617         }
618         if(url_ftell(pb) != gpos + gsize)
619             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
620         url_fseek(pb, gpos + gsize, SEEK_SET);
621     }
622     get_guid(pb, &g);
623     get_le64(pb);
624     get_byte(pb);
625     get_byte(pb);
626     if (url_feof(pb))
627         return -1;
628     asf->data_offset = url_ftell(pb);
629     asf->packet_size_left = 0;
630
631
632     for(i=0; i<128; i++){
633         int stream_num= asf->asfid2avid[i];
634         if(stream_num>=0){
635             AVStream *st = s->streams[stream_num];
636             if (!st->codec->bit_rate)
637                 st->codec->bit_rate = bitrate[i];
638             if (dar[i].num > 0 && dar[i].den > 0){
639                 av_reduce(&st->sample_aspect_ratio.num,
640                           &st->sample_aspect_ratio.den,
641                           dar[i].num, dar[i].den, INT_MAX);
642             } 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.
643                 av_reduce(&st->sample_aspect_ratio.num,
644                           &st->sample_aspect_ratio.den,
645                           dar[0].num, dar[0].den, INT_MAX);
646
647 //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);
648
649             // copy and convert language codes to the frontend
650             if (asf->streams[i].stream_language_index < 128) {
651                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
652                 if (rfc1766 && strlen(rfc1766) > 1) {
653                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
654                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
655                     if (iso6392)
656                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
657                 }
658             }
659         }
660     }
661
662     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
663
664     return 0;
665 }
666
667 #define DO_2BITS(bits, var, defval) \
668     switch (bits & 3) \
669     { \
670     case 3: var = get_le32(pb); rsize += 4; break; \
671     case 2: var = get_le16(pb); rsize += 2; break; \
672     case 1: var = get_byte(pb); rsize++; break; \
673     default: var = defval; break; \
674     }
675
676 /**
677  * Load a single ASF packet into the demuxer.
678  * @param s demux context
679  * @param pb context to read data from
680  * @return 0 on success, <0 on error
681  */
682 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
683 {
684     ASFContext *asf = s->priv_data;
685     uint32_t packet_length, padsize;
686     int rsize = 8;
687     int c, d, e, off;
688
689     // if we do not know packet size, allow skipping up to 32 kB
690     off= 32768;
691     if (s->packet_size > 0)
692         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
693
694     c=d=e=-1;
695     while(off-- > 0){
696         c=d; d=e;
697         e= get_byte(pb);
698         if(c == 0x82 && !d && !e)
699             break;
700     }
701
702     if (c != 0x82) {
703         /**
704          * This code allows handling of -EAGAIN at packet boundaries (i.e.
705          * if the packet sync code above triggers -EAGAIN). This does not
706          * imply complete -EAGAIN handling support at random positions in
707          * the stream.
708          */
709         if (url_ferror(pb) == AVERROR(EAGAIN))
710             return AVERROR(EAGAIN);
711         if (!url_feof(pb))
712             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
713     }
714     if ((c & 0x8f) == 0x82) {
715         if (d || e) {
716             if (!url_feof(pb))
717                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
718             return -1;
719         }
720         c= get_byte(pb);
721         d= get_byte(pb);
722         rsize+=3;
723     }else{
724         url_fseek(pb, -1, SEEK_CUR); //FIXME
725     }
726
727     asf->packet_flags    = c;
728     asf->packet_property = d;
729
730     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
731     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
732     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
733
734     //the following checks prevent overflows and infinite loops
735     if(!packet_length || packet_length >= (1U<<29)){
736         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
737         return -1;
738     }
739     if(padsize >= packet_length){
740         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
741         return -1;
742     }
743
744     asf->packet_timestamp = get_le32(pb);
745     get_le16(pb); /* duration */
746     // rsize has at least 11 bytes which have to be present
747
748     if (asf->packet_flags & 0x01) {
749         asf->packet_segsizetype = get_byte(pb); rsize++;
750         asf->packet_segments = asf->packet_segsizetype & 0x3f;
751     } else {
752         asf->packet_segments = 1;
753         asf->packet_segsizetype = 0x80;
754     }
755     asf->packet_size_left = packet_length - padsize - rsize;
756     if (packet_length < asf->hdr.min_pktsize)
757         padsize += asf->hdr.min_pktsize - packet_length;
758     asf->packet_padsize = padsize;
759     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
760     return 0;
761 }
762
763 /**
764  *
765  * @return <0 if error
766  */
767 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
768     ASFContext *asf = s->priv_data;
769     int rsize = 1;
770     int num = get_byte(pb);
771     int64_t ts0, ts1;
772
773     asf->packet_segments--;
774     asf->packet_key_frame = num >> 7;
775     asf->stream_index = asf->asfid2avid[num & 0x7f];
776     // sequence should be ignored!
777     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
778     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
779     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
780 //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);
781     if (asf->packet_replic_size >= 8) {
782         asf->packet_obj_size = get_le32(pb);
783         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
784             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
785             return -1;
786         }
787         asf->packet_frag_timestamp = get_le32(pb); // timestamp
788         if(asf->packet_replic_size >= 8+38+4){
789 //            for(i=0; i<asf->packet_replic_size-8; i++)
790 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
791 //            av_log(s, AV_LOG_DEBUG, "\n");
792             url_fskip(pb, 10);
793             ts0= get_le64(pb);
794             ts1= get_le64(pb);
795             url_fskip(pb, 12);
796             get_le32(pb);
797             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
798             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
799             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
800         }else
801             url_fskip(pb, asf->packet_replic_size - 8);
802         rsize += asf->packet_replic_size; // FIXME - check validity
803     } else if (asf->packet_replic_size==1){
804         // multipacket - frag_offset is beginning timestamp
805         asf->packet_time_start = asf->packet_frag_offset;
806         asf->packet_frag_offset = 0;
807         asf->packet_frag_timestamp = asf->packet_timestamp;
808
809         asf->packet_time_delta = get_byte(pb);
810         rsize++;
811     }else if(asf->packet_replic_size!=0){
812         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
813         return -1;
814     }
815     if (asf->packet_flags & 0x01) {
816         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
817         if(asf->packet_frag_size > asf->packet_size_left - rsize){
818             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
819             return -1;
820         }
821         //printf("Fragsize %d\n", asf->packet_frag_size);
822     } else {
823         asf->packet_frag_size = asf->packet_size_left - rsize;
824         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
825     }
826     if (asf->packet_replic_size == 1) {
827         asf->packet_multi_size = asf->packet_frag_size;
828         if (asf->packet_multi_size > asf->packet_size_left)
829             return -1;
830     }
831     asf->packet_size_left -= rsize;
832     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
833
834     return 0;
835 }
836
837 /**
838  * Parse data from individual ASF packets (which were previously loaded
839  * with asf_get_packet()).
840  * @param s demux context
841  * @param pb context to read data from
842  * @param pkt pointer to store packet data into
843  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
844  *          packets need to be loaded (through asf_get_packet())
845  */
846 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
847 {
848     ASFContext *asf = s->priv_data;
849     ASFStream *asf_st = 0;
850     for (;;) {
851         int ret;
852         if(url_feof(pb))
853             return AVERROR_EOF;
854         if (asf->packet_size_left < FRAME_HEADER_SIZE
855             || asf->packet_segments < 1) {
856             //asf->packet_size_left <= asf->packet_padsize) {
857             int ret = asf->packet_size_left + asf->packet_padsize;
858             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
859             assert(ret>=0);
860             /* fail safe */
861             url_fskip(pb, ret);
862
863             asf->packet_pos= url_ftell(pb);
864             if (asf->data_object_size != (uint64_t)-1 &&
865                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
866                 return AVERROR_EOF; /* Do not exceed the size of the data object */
867             return 1;
868         }
869         if (asf->packet_time_start == 0) {
870             if(asf_read_frame_header(s, pb) < 0){
871                 asf->packet_segments= 0;
872                 continue;
873             }
874             if (asf->stream_index < 0
875                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
876                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
877                 ) {
878                 asf->packet_time_start = 0;
879                 /* unhandled packet (should not happen) */
880                 url_fskip(pb, asf->packet_frag_size);
881                 asf->packet_size_left -= asf->packet_frag_size;
882                 if(asf->stream_index < 0)
883                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
884                 continue;
885             }
886             asf->asf_st = s->streams[asf->stream_index]->priv_data;
887         }
888         asf_st = asf->asf_st;
889
890         if (asf->packet_replic_size == 1) {
891             // frag_offset is here used as the beginning timestamp
892             asf->packet_frag_timestamp = asf->packet_time_start;
893             asf->packet_time_start += asf->packet_time_delta;
894             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
895             asf->packet_size_left--;
896             asf->packet_multi_size--;
897             if (asf->packet_multi_size < asf->packet_obj_size)
898             {
899                 asf->packet_time_start = 0;
900                 url_fskip(pb, asf->packet_multi_size);
901                 asf->packet_size_left -= asf->packet_multi_size;
902                 continue;
903             }
904             asf->packet_multi_size -= asf->packet_obj_size;
905             //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);
906         }
907         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
908               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
909            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
910             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
911                 asf_st->frag_offset, asf->packet_frag_size,
912                 asf->packet_obj_size, asf_st->pkt.size);
913             asf->packet_obj_size= asf_st->pkt.size;
914         }
915
916         if (   asf_st->pkt.size != asf->packet_obj_size
917             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
918             if(asf_st->pkt.data){
919                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
920                 asf_st->frag_offset = 0;
921                 av_free_packet(&asf_st->pkt);
922             }
923             /* new packet */
924             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
925             asf_st->seq = asf->packet_seq;
926             asf_st->pkt.dts = asf->packet_frag_timestamp;
927             asf_st->pkt.stream_index = asf->stream_index;
928             asf_st->pkt.pos =
929             asf_st->packet_pos= asf->packet_pos;
930 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
931 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
932 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
933             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
934                 asf->packet_key_frame = 1;
935             if (asf->packet_key_frame)
936                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
937         }
938
939         /* read data */
940         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
941         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
942         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
943         asf->packet_size_left -= asf->packet_frag_size;
944         if (asf->packet_size_left < 0)
945             continue;
946
947         if(   asf->packet_frag_offset >= asf_st->pkt.size
948            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
949             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
950                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
951             continue;
952         }
953
954         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
955                          asf->packet_frag_size);
956         if (ret != asf->packet_frag_size)
957             return ret >= 0 ? AVERROR_EOF : ret;
958         if (s->key && s->keylen == 20)
959             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
960                             asf->packet_frag_size);
961         asf_st->frag_offset += asf->packet_frag_size;
962         /* test if whole packet is read */
963         if (asf_st->frag_offset == asf_st->pkt.size) {
964             //workaround for macroshit radio DVR-MS files
965             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
966                && asf_st->pkt.size > 100){
967                 int i;
968                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
969                 if(i == asf_st->pkt.size){
970                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
971                     asf_st->frag_offset = 0;
972                     av_free_packet(&asf_st->pkt);
973                     continue;
974                 }
975             }
976
977             /* return packet */
978             if (asf_st->ds_span > 1) {
979               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
980                     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);
981               }else{
982                 /* packet descrambling */
983                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
984                 if (newdata) {
985                     int offset = 0;
986                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
987                     while (offset < asf_st->pkt.size) {
988                         int off = offset / asf_st->ds_chunk_size;
989                         int row = off / asf_st->ds_span;
990                         int col = off % asf_st->ds_span;
991                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
992                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
993
994                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
995                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
996                         memcpy(newdata + offset,
997                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
998                                asf_st->ds_chunk_size);
999                         offset += asf_st->ds_chunk_size;
1000                     }
1001                     av_free(asf_st->pkt.data);
1002                     asf_st->pkt.data = newdata;
1003                 }
1004               }
1005             }
1006             asf_st->frag_offset = 0;
1007             *pkt= asf_st->pkt;
1008             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
1009             asf_st->pkt.size = 0;
1010             asf_st->pkt.data = 0;
1011             break; // packet completed
1012         }
1013     }
1014     return 0;
1015 }
1016
1017 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1018 {
1019     ASFContext *asf = s->priv_data;
1020
1021     for (;;) {
1022         int ret;
1023
1024         /* parse cached packets, if any */
1025         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1026             return ret;
1027         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1028             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1029         asf->packet_time_start = 0;
1030     }
1031
1032     return 0;
1033 }
1034
1035 // Added to support seeking after packets have been read
1036 // If information is not reset, read_packet fails due to
1037 // leftover information from previous reads
1038 static void asf_reset_header(AVFormatContext *s)
1039 {
1040     ASFContext *asf = s->priv_data;
1041     ASFStream *asf_st;
1042     int i;
1043
1044     asf->packet_nb_frames = 0;
1045     asf->packet_size_left = 0;
1046     asf->packet_segments = 0;
1047     asf->packet_flags = 0;
1048     asf->packet_property = 0;
1049     asf->packet_timestamp = 0;
1050     asf->packet_segsizetype = 0;
1051     asf->packet_segments = 0;
1052     asf->packet_seq = 0;
1053     asf->packet_replic_size = 0;
1054     asf->packet_key_frame = 0;
1055     asf->packet_padsize = 0;
1056     asf->packet_frag_offset = 0;
1057     asf->packet_frag_size = 0;
1058     asf->packet_frag_timestamp = 0;
1059     asf->packet_multi_size = 0;
1060     asf->packet_obj_size = 0;
1061     asf->packet_time_delta = 0;
1062     asf->packet_time_start = 0;
1063
1064     for(i=0; i<s->nb_streams; i++){
1065         asf_st= s->streams[i]->priv_data;
1066         av_free_packet(&asf_st->pkt);
1067         asf_st->frag_offset=0;
1068         asf_st->seq=0;
1069     }
1070     asf->asf_st= NULL;
1071 }
1072
1073 static int asf_read_close(AVFormatContext *s)
1074 {
1075     int i;
1076
1077     asf_reset_header(s);
1078     for(i=0;i<s->nb_streams;i++) {
1079         AVStream *st = s->streams[i];
1080         av_free(st->codec->palctrl);
1081     }
1082     return 0;
1083 }
1084
1085 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1086 {
1087     AVPacket pkt1, *pkt = &pkt1;
1088     ASFStream *asf_st;
1089     int64_t pts;
1090     int64_t pos= *ppos;
1091     int i;
1092     int64_t start_pos[ASF_MAX_STREAMS];
1093
1094     for(i=0; i<s->nb_streams; i++){
1095         start_pos[i]= pos;
1096     }
1097
1098     if (s->packet_size > 0)
1099         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1100     *ppos= pos;
1101     url_fseek(s->pb, pos, SEEK_SET);
1102
1103 //printf("asf_read_pts\n");
1104     asf_reset_header(s);
1105     for(;;){
1106         if (av_read_frame(s, pkt) < 0){
1107             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1108             return AV_NOPTS_VALUE;
1109         }
1110
1111         pts= pkt->pts;
1112
1113         av_free_packet(pkt);
1114         if(pkt->flags&AV_PKT_FLAG_KEY){
1115             i= pkt->stream_index;
1116
1117             asf_st= s->streams[i]->priv_data;
1118
1119 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1120             pos= asf_st->packet_pos;
1121
1122             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1123             start_pos[i]= asf_st->packet_pos + 1;
1124
1125             if(pkt->stream_index == stream_index)
1126                break;
1127         }
1128     }
1129
1130     *ppos= pos;
1131 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1132
1133     return pts;
1134 }
1135
1136 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1137 {
1138     ff_asf_guid g;
1139     ASFContext *asf = s->priv_data;
1140     int64_t current_pos= url_ftell(s->pb);
1141     int i;
1142
1143     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1144     get_guid(s->pb, &g);
1145
1146     /* the data object can be followed by other top-level objects,
1147        skip them until the simple index object is reached */
1148     while (guidcmp(&g, &index_guid)) {
1149         int64_t gsize= get_le64(s->pb);
1150         if (gsize < 24 || url_feof(s->pb)) {
1151             url_fseek(s->pb, current_pos, SEEK_SET);
1152             return;
1153         }
1154         url_fseek(s->pb, gsize-24, SEEK_CUR);
1155         get_guid(s->pb, &g);
1156     }
1157
1158     {
1159         int64_t itime, last_pos=-1;
1160         int pct, ict;
1161         int64_t av_unused gsize= get_le64(s->pb);
1162         get_guid(s->pb, &g);
1163         itime=get_le64(s->pb);
1164         pct=get_le32(s->pb);
1165         ict=get_le32(s->pb);
1166         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1167
1168         for (i=0;i<ict;i++){
1169             int pktnum=get_le32(s->pb);
1170             int pktct =get_le16(s->pb);
1171             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1172             int64_t index_pts= av_rescale(itime, i, 10000);
1173
1174             if(pos != last_pos){
1175             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1176             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1177             last_pos=pos;
1178             }
1179         }
1180         asf->index_read= 1;
1181     }
1182     url_fseek(s->pb, current_pos, SEEK_SET);
1183 }
1184
1185 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1186 {
1187     ASFContext *asf = s->priv_data;
1188     AVStream *st = s->streams[stream_index];
1189     int64_t pos;
1190     int index;
1191
1192     if (s->packet_size <= 0)
1193         return -1;
1194
1195     /* Try using the protocol's read_seek if available */
1196     if(s->pb) {
1197         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1198         if(ret >= 0)
1199             asf_reset_header(s);
1200         if (ret != AVERROR(ENOSYS))
1201             return ret;
1202     }
1203
1204     if (!asf->index_read)
1205         asf_build_simple_index(s, stream_index);
1206
1207     if(!(asf->index_read && st->index_entries)){
1208         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1209             return -1;
1210     }else{
1211         index= av_index_search_timestamp(st, pts, flags);
1212         if(index<0)
1213             return -1;
1214
1215         /* find the position */
1216         pos = st->index_entries[index].pos;
1217
1218     // various attempts to find key frame have failed so far
1219     //    asf_reset_header(s);
1220     //    url_fseek(s->pb, pos, SEEK_SET);
1221     //    key_pos = pos;
1222     //     for(i=0;i<16;i++){
1223     //         pos = url_ftell(s->pb);
1224     //         if (av_read_frame(s, &pkt) < 0){
1225     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1226     //             return -1;
1227     //         }
1228     //         asf_st = s->streams[stream_index]->priv_data;
1229     //         pos += st->parser->frame_offset;
1230     //
1231     //         if (pkt.size > b) {
1232     //             b = pkt.size;
1233     //             key_pos = pos;
1234     //         }
1235     //
1236     //         av_free_packet(&pkt);
1237     //     }
1238
1239         /* do the seek */
1240         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1241         url_fseek(s->pb, pos, SEEK_SET);
1242     }
1243     asf_reset_header(s);
1244     return 0;
1245 }
1246
1247 AVInputFormat asf_demuxer = {
1248     "asf",
1249     NULL_IF_CONFIG_SMALL("ASF format"),
1250     sizeof(ASFContext),
1251     asf_probe,
1252     asf_read_header,
1253     asf_read_packet,
1254     asf_read_close,
1255     asf_read_seek,
1256     asf_read_pts,
1257 };