5c67b7f25996b10f7f3467065d8d5763c9ed2b07
[ffmpeg.git] / libavformat / asf.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 #include "avformat.h"
22 #include "riff.h"
23 #include "mpegaudio.h"
24 #include "asf.h"
25 #include "common.h"
26
27 #undef NDEBUG
28 #include <assert.h>
29
30 #define FRAME_HEADER_SIZE 17
31 // Fix Me! FRAME_HEADER_SIZE may be different.
32
33 static const GUID index_guid = {
34     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
35 };
36
37 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
38     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
39 };
40 /**********************************/
41 /* decoding */
42
43 //#define DEBUG
44
45 #ifdef DEBUG
46 #define PRINT_IF_GUID(g,cmp) \
47 if (!memcmp(g, &cmp, sizeof(GUID))) \
48     printf("(GUID: %s) ", #cmp)
49
50 static void print_guid(const GUID *g)
51 {
52     int i;
53     PRINT_IF_GUID(g, asf_header);
54     else PRINT_IF_GUID(g, file_header);
55     else PRINT_IF_GUID(g, stream_header);
56     else PRINT_IF_GUID(g, audio_stream);
57     else PRINT_IF_GUID(g, audio_conceal_none);
58     else PRINT_IF_GUID(g, video_stream);
59     else PRINT_IF_GUID(g, video_conceal_none);
60     else PRINT_IF_GUID(g, command_stream);
61     else PRINT_IF_GUID(g, comment_header);
62     else PRINT_IF_GUID(g, codec_comment_header);
63     else PRINT_IF_GUID(g, codec_comment1_header);
64     else PRINT_IF_GUID(g, data_header);
65     else PRINT_IF_GUID(g, index_guid);
66     else PRINT_IF_GUID(g, head1_guid);
67     else PRINT_IF_GUID(g, head2_guid);
68     else PRINT_IF_GUID(g, my_guid);
69     else PRINT_IF_GUID(g, ext_stream_header);
70     else PRINT_IF_GUID(g, extended_content_header);
71     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
72     else PRINT_IF_GUID(g, ext_stream_audio_stream);
73     else PRINT_IF_GUID(g, metadata_header);
74     else PRINT_IF_GUID(g, stream_bitrate_guid);
75     else
76         printf("(GUID: unknown) ");
77     for(i=0;i<16;i++)
78         printf(" 0x%02x,", (*g)[i]);
79     printf("}\n");
80 }
81 #undef PRINT_IF_GUID
82 #endif
83
84 static void get_guid(ByteIOContext *s, GUID *g)
85 {
86     assert(sizeof(*g) == 16);
87     get_buffer(s, g, sizeof(*g));
88 }
89
90 #if 0
91 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
92 {
93     int len, c;
94     char *q;
95
96     len = get_le16(pb);
97     q = buf;
98     while (len > 0) {
99         c = get_le16(pb);
100         if ((q - buf) < buf_size - 1)
101             *q++ = c;
102         len--;
103     }
104     *q = '\0';
105 }
106 #endif
107
108 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
109 {
110     char* q = buf;
111     len /= 2;
112     while (len--) {
113         uint8_t tmp;
114         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
115     }
116     *q = '\0';
117 }
118
119 static int asf_probe(AVProbeData *pd)
120 {
121     /* check file header */
122     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
123         return AVPROBE_SCORE_MAX;
124     else
125         return 0;
126 }
127
128 static int get_value(ByteIOContext *pb, int type){
129     switch(type){
130         case 2: return get_le32(pb);
131         case 3: return get_le32(pb);
132         case 4: return get_le64(pb);
133         case 5: return get_le16(pb);
134         default:return INT_MIN;
135     }
136 }
137
138 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
139 {
140     ASFContext *asf = s->priv_data;
141     GUID g;
142     ByteIOContext *pb = &s->pb;
143     AVStream *st;
144     ASFStream *asf_st;
145     int size, i;
146     int64_t gsize;
147     AVRational dar[128];
148
149     memset(dar, 0, sizeof(dar));
150
151     get_guid(pb, &g);
152     if (memcmp(&g, &asf_header, sizeof(GUID)))
153         goto fail;
154     get_le64(pb);
155     get_le32(pb);
156     get_byte(pb);
157     get_byte(pb);
158     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
159     for(;;) {
160         get_guid(pb, &g);
161         gsize = get_le64(pb);
162 #ifdef DEBUG
163         printf("%08"PRIx64": ", url_ftell(pb) - 24);
164         print_guid(&g);
165         printf("  size=0x%"PRIx64"\n", gsize);
166 #endif
167         if (!memcmp(&g, &data_header, sizeof(GUID))) {
168             asf->data_object_offset = url_ftell(pb);
169             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
170             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
171                 asf->data_object_size = gsize - 24;
172             } else {
173                 asf->data_object_size = (uint64_t)-1;
174             }
175             break;
176         }
177         if (gsize < 24)
178             goto fail;
179         if (!memcmp(&g, &file_header, sizeof(GUID))) {
180             get_guid(pb, &asf->hdr.guid);
181             asf->hdr.file_size          = get_le64(pb);
182             asf->hdr.create_time        = get_le64(pb);
183             asf->nb_packets             = get_le64(pb);
184             asf->hdr.send_time          = get_le64(pb);
185             asf->hdr.play_time          = get_le64(pb);
186             asf->hdr.preroll            = get_le32(pb);
187             asf->hdr.ignore             = get_le32(pb);
188             asf->hdr.flags              = get_le32(pb);
189             asf->hdr.min_pktsize        = get_le32(pb);
190             asf->hdr.max_pktsize        = get_le32(pb);
191             asf->hdr.max_bitrate        = get_le32(pb);
192             asf->packet_size = asf->hdr.max_pktsize;
193         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
194             int type, type_specific_size, sizeX;
195             uint64_t total_size;
196             unsigned int tag1;
197             int64_t pos1, pos2;
198             int test_for_ext_stream_audio;
199
200             pos1 = url_ftell(pb);
201
202             st = av_new_stream(s, 0);
203             if (!st)
204                 goto fail;
205             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
206             asf_st = av_mallocz(sizeof(ASFStream));
207             if (!asf_st)
208                 goto fail;
209             st->priv_data = asf_st;
210             st->start_time = asf->hdr.preroll;
211             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
212                 st->duration = asf->hdr.send_time /
213                     (10000000 / 1000) - st->start_time;
214             }
215             get_guid(pb, &g);
216
217             test_for_ext_stream_audio = 0;
218             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
219                 type = CODEC_TYPE_AUDIO;
220             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
221                 type = CODEC_TYPE_VIDEO;
222             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
223                 type = CODEC_TYPE_UNKNOWN;
224             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
225                 test_for_ext_stream_audio = 1;
226                 type = CODEC_TYPE_UNKNOWN;
227             } else {
228                 goto fail;
229             }
230             get_guid(pb, &g);
231             total_size = get_le64(pb);
232             type_specific_size = get_le32(pb);
233             get_le32(pb);
234             st->id = get_le16(pb) & 0x7f; /* stream id */
235             // mapping of asf ID to AV stream ID;
236             asf->asfid2avid[st->id] = s->nb_streams - 1;
237
238             get_le32(pb);
239
240             if (test_for_ext_stream_audio) {
241                 get_guid(pb, &g);
242                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
243                     type = CODEC_TYPE_AUDIO;
244                     get_guid(pb, &g);
245                     get_le32(pb);
246                     get_le32(pb);
247                     get_le32(pb);
248                     get_guid(pb, &g);
249                     get_le32(pb);
250                 }
251             }
252
253             st->codec->codec_type = type;
254             if (type == CODEC_TYPE_AUDIO) {
255                 get_wav_header(pb, st->codec, type_specific_size);
256                 st->need_parsing = 1;
257                 /* We have to init the frame size at some point .... */
258                 pos2 = url_ftell(pb);
259                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
260                     asf_st->ds_span = get_byte(pb);
261                     asf_st->ds_packet_size = get_le16(pb);
262                     asf_st->ds_chunk_size = get_le16(pb);
263                     get_le16(pb); //ds_data_size
264                     get_byte(pb); //ds_silence_data
265                 }
266                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
267                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
268                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
269                 if (asf_st->ds_span > 1) {
270                     if (!asf_st->ds_chunk_size
271                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
272                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
273                         asf_st->ds_span = 0; // disable descrambling
274                 }
275                 switch (st->codec->codec_id) {
276                 case CODEC_ID_MP3:
277                     st->codec->frame_size = MPA_FRAME_SIZE;
278                     break;
279                 case CODEC_ID_PCM_S16LE:
280                 case CODEC_ID_PCM_S16BE:
281                 case CODEC_ID_PCM_U16LE:
282                 case CODEC_ID_PCM_U16BE:
283                 case CODEC_ID_PCM_S8:
284                 case CODEC_ID_PCM_U8:
285                 case CODEC_ID_PCM_ALAW:
286                 case CODEC_ID_PCM_MULAW:
287                     st->codec->frame_size = 1;
288                     break;
289                 default:
290                     /* This is probably wrong, but it prevents a crash later */
291                     st->codec->frame_size = 1;
292                     break;
293                 }
294             } else if (type == CODEC_TYPE_VIDEO) {
295                 get_le32(pb);
296                 get_le32(pb);
297                 get_byte(pb);
298                 size = get_le16(pb); /* size */
299                 sizeX= get_le32(pb); /* size */
300                 st->codec->width = get_le32(pb);
301                 st->codec->height = get_le32(pb);
302                 /* not available for asf */
303                 get_le16(pb); /* panes */
304                 st->codec->bits_per_sample = get_le16(pb); /* depth */
305                 tag1 = get_le32(pb);
306                 url_fskip(pb, 20);
307 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
308                 size= sizeX;
309                 if (size > 40) {
310                     st->codec->extradata_size = size - 40;
311                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
312                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
313                 }
314
315         /* Extract palette from extradata if bpp <= 8 */
316         /* This code assumes that extradata contains only palette */
317         /* This is true for all paletted codecs implemented in ffmpeg */
318         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
319             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
320 #ifdef WORDS_BIGENDIAN
321             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
322                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
323 #else
324             memcpy(st->codec->palctrl->palette, st->codec->extradata,
325                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
326 #endif
327             st->codec->palctrl->palette_changed = 1;
328         }
329
330                 st->codec->codec_tag = tag1;
331                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
332                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
333                     st->need_parsing = 1;
334             }
335             pos2 = url_ftell(pb);
336             url_fskip(pb, gsize - (pos2 - pos1 + 24));
337         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
338             int len1, len2, len3, len4, len5;
339
340             len1 = get_le16(pb);
341             len2 = get_le16(pb);
342             len3 = get_le16(pb);
343             len4 = get_le16(pb);
344             len5 = get_le16(pb);
345             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
346             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
347             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
348             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
349             url_fskip(pb, len5);
350         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
351             int stream_count = get_le16(pb);
352             int j;
353
354 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
355 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
356             for(j = 0; j < stream_count; j++) {
357                 int flags, bitrate, stream_id;
358
359                 flags= get_le16(pb);
360                 bitrate= get_le32(pb);
361                 stream_id= (flags & 0x7f);
362 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
363                 asf->stream_bitrates[stream_id-1]= bitrate;
364             }
365        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
366                 int desc_count, i;
367
368                 desc_count = get_le16(pb);
369                 for(i=0;i<desc_count;i++)
370                 {
371                         int name_len,value_type,value_len;
372                         uint64_t value_num = 0;
373                         char name[1024];
374
375                         name_len = get_le16(pb);
376                         get_str16_nolen(pb, name_len, name, sizeof(name));
377                         value_type = get_le16(pb);
378                         value_len = get_le16(pb);
379                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
380                         {
381                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
382                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
383                                 else url_fskip(pb, value_len);
384                         }
385                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
386                         {
387                                 value_num= get_value(pb, value_type);
388                                 if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
389                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
390                         }
391                 }
392         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
393             int n, stream_num, name_len, value_len, value_type, value_num;
394             n = get_le16(pb);
395
396             for(i=0;i<n;i++) {
397                 char name[1024];
398
399                 get_le16(pb); //lang_list_index
400                 stream_num= get_le16(pb);
401                 name_len=   get_le16(pb);
402                 value_type= get_le16(pb);
403                 value_len=  get_le32(pb);
404
405                 get_str16_nolen(pb, name_len, name, sizeof(name));
406 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
407                 value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
408                 url_fskip(pb, value_len - 2);
409
410                 if(stream_num<128){
411                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
412                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
413                 }
414             }
415         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
416             int ext_len, payload_ext_ct, stream_ct;
417             uint32_t ext_d;
418             int64_t pos_ex_st;
419             pos_ex_st = url_ftell(pb);
420
421             get_le64(pb); // starttime
422             get_le64(pb); // endtime
423             get_le32(pb); // leak-datarate
424             get_le32(pb); // bucket-datasize
425             get_le32(pb); // init-bucket-fullness
426             get_le32(pb); // alt-leak-datarate
427             get_le32(pb); // alt-bucket-datasize
428             get_le32(pb); // alt-init-bucket-fullness
429             get_le32(pb); // max-object-size
430             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
431             get_le16(pb); // stream-num
432             get_le16(pb); // stream-language-id-index
433             get_le64(pb); // avg frametime in 100ns units
434             stream_ct = get_le16(pb); //stream-name-count
435             payload_ext_ct = get_le16(pb); //payload-extension-system-count
436
437             for (i=0; i<stream_ct; i++){
438                 get_le16(pb);
439                 ext_len = get_le16(pb);
440                 url_fseek(pb, ext_len, SEEK_CUR);
441             }
442
443             for (i=0; i<payload_ext_ct; i++){
444                 get_guid(pb, &g);
445                 ext_d=get_le16(pb);
446                 ext_len=get_le32(pb);
447                 url_fseek(pb, ext_len, SEEK_CUR);
448             }
449
450             // there could be a optional stream properties object to follow
451             // if so the next iteration will pick it up
452         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
453             int v1, v2;
454             get_guid(pb, &g);
455             v1 = get_le32(pb);
456             v2 = get_le16(pb);
457 #if 0
458         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
459             int len, v1, n, num;
460             char str[256], *q;
461             char tag[16];
462
463             get_guid(pb, &g);
464             print_guid(&g);
465
466             n = get_le32(pb);
467             for(i=0;i<n;i++) {
468                 num = get_le16(pb); /* stream number */
469                 get_str16(pb, str, sizeof(str));
470                 get_str16(pb, str, sizeof(str));
471                 len = get_le16(pb);
472                 q = tag;
473                 while (len > 0) {
474                     v1 = get_byte(pb);
475                     if ((q - tag) < sizeof(tag) - 1)
476                         *q++ = v1;
477                     len--;
478                 }
479                 *q = '\0';
480             }
481 #endif
482         } else if (url_feof(pb)) {
483             goto fail;
484         } else {
485             url_fseek(pb, gsize - 24, SEEK_CUR);
486         }
487     }
488     get_guid(pb, &g);
489     get_le64(pb);
490     get_byte(pb);
491     get_byte(pb);
492     if (url_feof(pb))
493         goto fail;
494     asf->data_offset = url_ftell(pb);
495     asf->packet_size_left = 0;
496
497
498     for(i=0; i<128; i++){
499         int stream_num= asf->asfid2avid[i];
500         if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){
501             AVCodecContext *codec= s->streams[stream_num]->codec;
502             av_reduce(&codec->sample_aspect_ratio.num,
503                     &codec->sample_aspect_ratio.den,
504                     dar[i].num, dar[i].den, INT_MAX);
505 //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
506         }
507     }
508
509     return 0;
510
511  fail:
512      for(i=0;i<s->nb_streams;i++) {
513         AVStream *st = s->streams[i];
514         if (st) {
515             av_free(st->priv_data);
516             av_free(st->codec->extradata);
517         }
518         av_free(st);
519     }
520     return -1;
521 }
522
523 #define DO_2BITS(bits, var, defval) \
524     switch (bits & 3) \
525     { \
526     case 3: var = get_le32(pb); rsize += 4; break; \
527     case 2: var = get_le16(pb); rsize += 2; break; \
528     case 1: var = get_byte(pb); rsize++; break; \
529     default: var = defval; break; \
530     }
531
532 /**
533  *
534  * @return <0 in case of an error
535  */
536 static int asf_get_packet(AVFormatContext *s)
537 {
538     ASFContext *asf = s->priv_data;
539     ByteIOContext *pb = &s->pb;
540     uint32_t packet_length, padsize;
541     int rsize = 8;
542     int c, d, e, off;
543
544     off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
545
546     c=d=e=-1;
547     while(off-- > 0){
548         c=d; d=e;
549         e= get_byte(pb);
550         if(c == 0x82 && !d && !e)
551             break;
552     }
553
554     if (c != 0x82) {
555         if (!url_feof(pb))
556             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
557     }
558     if ((c & 0x8f) == 0x82) {
559         if (d || e) {
560             if (!url_feof(pb))
561                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
562             return -1;
563         }
564         c= get_byte(pb);
565         d= get_byte(pb);
566         rsize+=3;
567     }else{
568         url_fseek(pb, -1, SEEK_CUR); //FIXME
569     }
570
571     asf->packet_flags    = c;
572     asf->packet_property = d;
573
574     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
575     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
576     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
577
578     //the following checks prevent overflows and infinite loops
579     if(packet_length >= (1U<<29)){
580         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
581         return -1;
582     }
583     if(padsize >= packet_length){
584         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
585         return -1;
586     }
587
588     asf->packet_timestamp = get_le32(pb);
589     get_le16(pb); /* duration */
590     // rsize has at least 11 bytes which have to be present
591
592     if (asf->packet_flags & 0x01) {
593         asf->packet_segsizetype = get_byte(pb); rsize++;
594         asf->packet_segments = asf->packet_segsizetype & 0x3f;
595     } else {
596         asf->packet_segments = 1;
597         asf->packet_segsizetype = 0x80;
598     }
599     asf->packet_size_left = packet_length - padsize - rsize;
600     if (packet_length < asf->hdr.min_pktsize)
601         padsize += asf->hdr.min_pktsize - packet_length;
602     asf->packet_padsize = padsize;
603 #ifdef DEBUG
604     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
605 #endif
606     return 0;
607 }
608
609 /**
610  *
611  * @return <0 if error
612  */
613 static int asf_read_frame_header(AVFormatContext *s){
614     ASFContext *asf = s->priv_data;
615     ByteIOContext *pb = &s->pb;
616     int rsize = 1;
617     int num = get_byte(pb);
618     int64_t ts0, ts1;
619
620     asf->packet_segments--;
621     asf->packet_key_frame = num >> 7;
622     asf->stream_index = asf->asfid2avid[num & 0x7f];
623     // sequence should be ignored!
624     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
625     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
626     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
627 //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);
628     if (asf->packet_replic_size >= 8) {
629         asf->packet_obj_size = get_le32(pb);
630         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
631             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
632             return -1;
633         }
634         asf->packet_frag_timestamp = get_le32(pb); // timestamp
635         if(asf->packet_replic_size >= 8+38+4){
636 //            for(i=0; i<asf->packet_replic_size-8; i++)
637 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
638 //            av_log(s, AV_LOG_DEBUG, "\n");
639             url_fskip(pb, 10);
640             ts0= get_le64(pb);
641             ts1= get_le64(pb);
642             url_fskip(pb, 12);
643             get_le32(pb);
644             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
645             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
646             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
647         }else
648             url_fskip(pb, asf->packet_replic_size - 8);
649         rsize += asf->packet_replic_size; // FIXME - check validity
650     } else if (asf->packet_replic_size==1){
651         // multipacket - frag_offset is begining timestamp
652         asf->packet_time_start = asf->packet_frag_offset;
653         asf->packet_frag_offset = 0;
654         asf->packet_frag_timestamp = asf->packet_timestamp;
655
656         asf->packet_time_delta = get_byte(pb);
657         rsize++;
658     }else if(asf->packet_replic_size!=0){
659         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
660         return -1;
661     }
662     if (asf->packet_flags & 0x01) {
663         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
664         if(asf->packet_frag_size > asf->packet_size_left - rsize){
665             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
666             return -1;
667         }
668         //printf("Fragsize %d\n", asf->packet_frag_size);
669     } else {
670         asf->packet_frag_size = asf->packet_size_left - rsize;
671         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
672     }
673     if (asf->packet_replic_size == 1) {
674         asf->packet_multi_size = asf->packet_frag_size;
675         if (asf->packet_multi_size > asf->packet_size_left)
676             return -1;
677     }
678     asf->packet_size_left -= rsize;
679     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
680
681     return 0;
682 }
683
684 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
685 {
686     ASFContext *asf = s->priv_data;
687     ASFStream *asf_st = 0;
688     ByteIOContext *pb = &s->pb;
689     //static int pc = 0;
690     for (;;) {
691         if(url_feof(pb))
692             return AVERROR_IO;
693         if (asf->packet_size_left < FRAME_HEADER_SIZE
694             || asf->packet_segments < 1) {
695             //asf->packet_size_left <= asf->packet_padsize) {
696             int ret = asf->packet_size_left + asf->packet_padsize;
697             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
698             assert(ret>=0);
699             /* fail safe */
700             url_fskip(pb, ret);
701
702             asf->packet_pos= url_ftell(&s->pb);
703             if (asf->data_object_size != (uint64_t)-1 &&
704                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
705                 return AVERROR_IO; /* Do not exceed the size of the data object */
706             ret = asf_get_packet(s);
707             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
708             if (ret < 0)
709                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
710             asf->packet_time_start = 0;
711             continue;
712         }
713         if (asf->packet_time_start == 0) {
714             if(asf_read_frame_header(s) < 0){
715                 asf->packet_segments= 0;
716                 continue;
717             }
718             if (asf->stream_index < 0
719                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
720                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
721                 ) {
722                 asf->packet_time_start = 0;
723                 /* unhandled packet (should not happen) */
724                 url_fskip(pb, asf->packet_frag_size);
725                 asf->packet_size_left -= asf->packet_frag_size;
726                 if(asf->stream_index < 0)
727                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
728                 continue;
729             }
730             asf->asf_st = s->streams[asf->stream_index]->priv_data;
731         }
732         asf_st = asf->asf_st;
733
734         if (asf->packet_replic_size == 1) {
735             // frag_offset is here used as the begining timestamp
736             asf->packet_frag_timestamp = asf->packet_time_start;
737             asf->packet_time_start += asf->packet_time_delta;
738             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
739             asf->packet_size_left--;
740             asf->packet_multi_size--;
741             if (asf->packet_multi_size < asf->packet_obj_size)
742             {
743                 asf->packet_time_start = 0;
744                 url_fskip(pb, asf->packet_multi_size);
745                 asf->packet_size_left -= asf->packet_multi_size;
746                 continue;
747             }
748             asf->packet_multi_size -= asf->packet_obj_size;
749             //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);
750         }
751         if (   asf_st->pkt.size != asf->packet_obj_size
752             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
753             if(asf_st->pkt.data){
754                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
755                 asf_st->frag_offset = 0;
756                 av_free_packet(&asf_st->pkt);
757             }
758             /* new packet */
759             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
760             asf_st->seq = asf->packet_seq;
761             asf_st->pkt.pts = asf->packet_frag_timestamp;
762             asf_st->pkt.stream_index = asf->stream_index;
763             asf_st->pkt.pos =
764             asf_st->packet_pos= asf->packet_pos;
765 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
766 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
767 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
768             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
769                 asf->packet_key_frame = 1;
770             if (asf->packet_key_frame)
771                 asf_st->pkt.flags |= PKT_FLAG_KEY;
772         }
773
774         /* read data */
775         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
776         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
777         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
778         asf->packet_size_left -= asf->packet_frag_size;
779         if (asf->packet_size_left < 0)
780             continue;
781
782         if(   asf->packet_frag_offset >= asf_st->pkt.size
783            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
784             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
785                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
786             continue;
787         }
788
789         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
790                    asf->packet_frag_size);
791         asf_st->frag_offset += asf->packet_frag_size;
792         /* test if whole packet is read */
793         if (asf_st->frag_offset == asf_st->pkt.size) {
794             /* return packet */
795             if (asf_st->ds_span > 1) {
796               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
797                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
798               }else{
799                 /* packet descrambling */
800                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
801                 if (newdata) {
802                     int offset = 0;
803                     while (offset < asf_st->pkt.size) {
804                         int off = offset / asf_st->ds_chunk_size;
805                         int row = off / asf_st->ds_span;
806                         int col = off % asf_st->ds_span;
807                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
808                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
809
810                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
811                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
812                         memcpy(newdata + offset,
813                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
814                                asf_st->ds_chunk_size);
815                         offset += asf_st->ds_chunk_size;
816                     }
817                     av_free(asf_st->pkt.data);
818                     asf_st->pkt.data = newdata;
819                 }
820               }
821             }
822             asf_st->frag_offset = 0;
823             *pkt= asf_st->pkt;
824             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
825             asf_st->pkt.size = 0;
826             asf_st->pkt.data = 0;
827             break; // packet completed
828         }
829     }
830     return 0;
831 }
832
833 static int asf_read_close(AVFormatContext *s)
834 {
835     int i;
836
837     for(i=0;i<s->nb_streams;i++) {
838         AVStream *st = s->streams[i];
839         av_free(st->priv_data);
840         av_free(st->codec->palctrl);
841     }
842     return 0;
843 }
844
845 // Added to support seeking after packets have been read
846 // If information is not reset, read_packet fails due to
847 // leftover information from previous reads
848 static void asf_reset_header(AVFormatContext *s)
849 {
850     ASFContext *asf = s->priv_data;
851     ASFStream *asf_st;
852     int i;
853
854     asf->packet_nb_frames = 0;
855     asf->packet_size_left = 0;
856     asf->packet_segments = 0;
857     asf->packet_flags = 0;
858     asf->packet_property = 0;
859     asf->packet_timestamp = 0;
860     asf->packet_segsizetype = 0;
861     asf->packet_segments = 0;
862     asf->packet_seq = 0;
863     asf->packet_replic_size = 0;
864     asf->packet_key_frame = 0;
865     asf->packet_padsize = 0;
866     asf->packet_frag_offset = 0;
867     asf->packet_frag_size = 0;
868     asf->packet_frag_timestamp = 0;
869     asf->packet_multi_size = 0;
870     asf->packet_obj_size = 0;
871     asf->packet_time_delta = 0;
872     asf->packet_time_start = 0;
873
874     for(i=0; i<s->nb_streams; i++){
875         asf_st= s->streams[i]->priv_data;
876         av_free_packet(&asf_st->pkt);
877         asf_st->frag_offset=0;
878         asf_st->seq=0;
879     }
880     asf->asf_st= NULL;
881 }
882
883 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
884 {
885     ASFContext *asf = s->priv_data;
886     AVPacket pkt1, *pkt = &pkt1;
887     ASFStream *asf_st;
888     int64_t pts;
889     int64_t pos= *ppos;
890     int i;
891     int64_t start_pos[s->nb_streams];
892
893     for(i=0; i<s->nb_streams; i++){
894         start_pos[i]= pos;
895     }
896
897     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
898     *ppos= pos;
899     url_fseek(&s->pb, pos, SEEK_SET);
900
901 //printf("asf_read_pts\n");
902     asf_reset_header(s);
903     for(;;){
904         if (av_read_frame(s, pkt) < 0){
905             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
906             return AV_NOPTS_VALUE;
907         }
908
909         pts= pkt->pts;
910
911         av_free_packet(pkt);
912         if(pkt->flags&PKT_FLAG_KEY){
913             i= pkt->stream_index;
914
915             asf_st= s->streams[i]->priv_data;
916
917 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
918             pos= asf_st->packet_pos;
919
920             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
921             start_pos[i]= asf_st->packet_pos + 1;
922
923             if(pkt->stream_index == stream_index)
924                break;
925         }
926     }
927
928     *ppos= pos;
929 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
930
931     return pts;
932 }
933
934 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
935 {
936     GUID g;
937     ASFContext *asf = s->priv_data;
938     int64_t gsize, itime;
939     int64_t pos, current_pos, index_pts;
940     int i;
941     int pct,ict;
942
943     current_pos = url_ftell(&s->pb);
944
945     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
946     get_guid(&s->pb, &g);
947     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
948         gsize = get_le64(&s->pb);
949         get_guid(&s->pb, &g);
950         itime=get_le64(&s->pb);
951         pct=get_le32(&s->pb);
952         ict=get_le32(&s->pb);
953         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
954
955         for (i=0;i<ict;i++){
956             int pktnum=get_le32(&s->pb);
957             int pktct =get_le16(&s->pb);
958             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
959
960             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
961             index_pts=av_rescale(itime, i, 10000);
962
963             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
964         }
965         asf->index_read= 1;
966     }
967     url_fseek(&s->pb, current_pos, SEEK_SET);
968 }
969
970 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
971 {
972     ASFContext *asf = s->priv_data;
973     AVStream *st = s->streams[stream_index];
974     int64_t pos;
975     int index;
976
977     if (asf->packet_size <= 0)
978         return -1;
979
980     if (!asf->index_read)
981         asf_build_simple_index(s, stream_index);
982
983     if(!(asf->index_read && st->index_entries)){
984         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
985             return -1;
986     }else{
987         index= av_index_search_timestamp(st, pts, flags);
988         if(index<0)
989             return -1;
990
991         /* find the position */
992         pos = st->index_entries[index].pos;
993         pts = st->index_entries[index].timestamp;
994
995     // various attempts to find key frame have failed so far
996     //    asf_reset_header(s);
997     //    url_fseek(&s->pb, pos, SEEK_SET);
998     //    key_pos = pos;
999     //     for(i=0;i<16;i++){
1000     //         pos = url_ftell(&s->pb);
1001     //         if (av_read_frame(s, &pkt) < 0){
1002     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1003     //             return -1;
1004     //         }
1005     //         asf_st = s->streams[stream_index]->priv_data;
1006     //         pos += st->parser->frame_offset;
1007     //
1008     //         if (pkt.size > b) {
1009     //             b = pkt.size;
1010     //             key_pos = pos;
1011     //         }
1012     //
1013     //         av_free_packet(&pkt);
1014     //     }
1015
1016         /* do the seek */
1017         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1018         url_fseek(&s->pb, pos, SEEK_SET);
1019     }
1020     asf_reset_header(s);
1021     return 0;
1022 }
1023
1024 AVInputFormat asf_demuxer = {
1025     "asf",
1026     "asf format",
1027     sizeof(ASFContext),
1028     asf_probe,
1029     asf_read_header,
1030     asf_read_packet,
1031     asf_read_close,
1032     asf_read_seek,
1033     asf_read_pts,
1034 };