off by one error
[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 (pd->buf_size <= 32)
123         return 0;
124
125     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
126         return AVPROBE_SCORE_MAX;
127     else
128         return 0;
129 }
130
131 static int get_value(ByteIOContext *pb, int type){
132     switch(type){
133         case 2: return get_le32(pb);
134         case 3: return get_le32(pb);
135         case 4: return get_le64(pb);
136         case 5: return get_le16(pb);
137         default:return INT_MIN;
138     }
139 }
140
141 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
142 {
143     ASFContext *asf = s->priv_data;
144     GUID g;
145     ByteIOContext *pb = &s->pb;
146     AVStream *st;
147     ASFStream *asf_st;
148     int size, i;
149     int64_t gsize;
150     AVRational dar[128];
151
152     memset(dar, 0, sizeof(dar));
153
154     get_guid(pb, &g);
155     if (memcmp(&g, &asf_header, sizeof(GUID)))
156         goto fail;
157     get_le64(pb);
158     get_le32(pb);
159     get_byte(pb);
160     get_byte(pb);
161     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
162     for(;;) {
163         get_guid(pb, &g);
164         gsize = get_le64(pb);
165 #ifdef DEBUG
166         printf("%08"PRIx64": ", url_ftell(pb) - 24);
167         print_guid(&g);
168         printf("  size=0x%"PRIx64"\n", gsize);
169 #endif
170         if (gsize < 24)
171             goto fail;
172         if (!memcmp(&g, &file_header, sizeof(GUID))) {
173             get_guid(pb, &asf->hdr.guid);
174             asf->hdr.file_size          = get_le64(pb);
175             asf->hdr.create_time        = get_le64(pb);
176             asf->nb_packets             = get_le64(pb);
177             asf->hdr.send_time          = get_le64(pb);
178             asf->hdr.play_time          = get_le64(pb);
179             asf->hdr.preroll            = get_le32(pb);
180             asf->hdr.ignore             = get_le32(pb);
181             asf->hdr.flags              = get_le32(pb);
182             asf->hdr.min_pktsize        = get_le32(pb);
183             asf->hdr.max_pktsize        = get_le32(pb);
184             asf->hdr.max_bitrate        = get_le32(pb);
185             asf->packet_size = asf->hdr.max_pktsize;
186         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
187             int type, type_specific_size, sizeX;
188             uint64_t total_size;
189             unsigned int tag1;
190             int64_t pos1, pos2;
191             int test_for_ext_stream_audio;
192
193             pos1 = url_ftell(pb);
194
195             st = av_new_stream(s, 0);
196             if (!st)
197                 goto fail;
198             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
199             asf_st = av_mallocz(sizeof(ASFStream));
200             if (!asf_st)
201                 goto fail;
202             st->priv_data = asf_st;
203             st->start_time = asf->hdr.preroll;
204             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
205                 st->duration = asf->hdr.send_time /
206                     (10000000 / 1000) - st->start_time;
207             }
208             get_guid(pb, &g);
209
210             test_for_ext_stream_audio = 0;
211             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
212                 type = CODEC_TYPE_AUDIO;
213             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
214                 type = CODEC_TYPE_VIDEO;
215             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
216                 type = CODEC_TYPE_UNKNOWN;
217             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
218                 test_for_ext_stream_audio = 1;
219                 type = CODEC_TYPE_UNKNOWN;
220             } else {
221                 goto fail;
222             }
223             get_guid(pb, &g);
224             total_size = get_le64(pb);
225             type_specific_size = get_le32(pb);
226             get_le32(pb);
227             st->id = get_le16(pb) & 0x7f; /* stream id */
228             // mapping of asf ID to AV stream ID;
229             asf->asfid2avid[st->id] = s->nb_streams - 1;
230
231             get_le32(pb);
232
233             if (test_for_ext_stream_audio) {
234                 get_guid(pb, &g);
235                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
236                     type = CODEC_TYPE_AUDIO;
237                     get_guid(pb, &g);
238                     get_le32(pb);
239                     get_le32(pb);
240                     get_le32(pb);
241                     get_guid(pb, &g);
242                     get_le32(pb);
243                 }
244             }
245
246             st->codec->codec_type = type;
247             if (type == CODEC_TYPE_AUDIO) {
248                 get_wav_header(pb, st->codec, type_specific_size);
249                 st->need_parsing = 1;
250                 /* We have to init the frame size at some point .... */
251                 pos2 = url_ftell(pb);
252                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
253                     asf_st->ds_span = get_byte(pb);
254                     asf_st->ds_packet_size = get_le16(pb);
255                     asf_st->ds_chunk_size = get_le16(pb);
256                     get_le16(pb); //ds_data_size
257                     get_byte(pb); //ds_silence_data
258                 }
259                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
260                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
261                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
262                 if (asf_st->ds_span > 1) {
263                     if (!asf_st->ds_chunk_size
264                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
265                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
266                         asf_st->ds_span = 0; // disable descrambling
267                 }
268                 switch (st->codec->codec_id) {
269                 case CODEC_ID_MP3:
270                     st->codec->frame_size = MPA_FRAME_SIZE;
271                     break;
272                 case CODEC_ID_PCM_S16LE:
273                 case CODEC_ID_PCM_S16BE:
274                 case CODEC_ID_PCM_U16LE:
275                 case CODEC_ID_PCM_U16BE:
276                 case CODEC_ID_PCM_S8:
277                 case CODEC_ID_PCM_U8:
278                 case CODEC_ID_PCM_ALAW:
279                 case CODEC_ID_PCM_MULAW:
280                     st->codec->frame_size = 1;
281                     break;
282                 default:
283                     /* This is probably wrong, but it prevents a crash later */
284                     st->codec->frame_size = 1;
285                     break;
286                 }
287             } else if (type == CODEC_TYPE_VIDEO) {
288                 get_le32(pb);
289                 get_le32(pb);
290                 get_byte(pb);
291                 size = get_le16(pb); /* size */
292                 sizeX= get_le32(pb); /* size */
293                 st->codec->width = get_le32(pb);
294                 st->codec->height = get_le32(pb);
295                 /* not available for asf */
296                 get_le16(pb); /* panes */
297                 st->codec->bits_per_sample = get_le16(pb); /* depth */
298                 tag1 = get_le32(pb);
299                 url_fskip(pb, 20);
300 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
301                 size= sizeX;
302                 if (size > 40) {
303                     st->codec->extradata_size = size - 40;
304                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
305                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
306                 }
307
308         /* Extract palette from extradata if bpp <= 8 */
309         /* This code assumes that extradata contains only palette */
310         /* This is true for all paletted codecs implemented in ffmpeg */
311         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
312             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
313 #ifdef WORDS_BIGENDIAN
314             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
315                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
316 #else
317             memcpy(st->codec->palctrl->palette, st->codec->extradata,
318                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
319 #endif
320             st->codec->palctrl->palette_changed = 1;
321         }
322
323                 st->codec->codec_tag = tag1;
324                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
325                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
326                     st->need_parsing = 1;
327             }
328             pos2 = url_ftell(pb);
329             url_fskip(pb, gsize - (pos2 - pos1 + 24));
330         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
331             asf->data_object_offset = url_ftell(pb);
332             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
333             if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
334                 asf->data_object_size = gsize - 24;
335             } else {
336                 asf->data_object_size = (uint64_t)-1;
337             }
338             break;
339         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
340             int len1, len2, len3, len4, len5;
341
342             len1 = get_le16(pb);
343             len2 = get_le16(pb);
344             len3 = get_le16(pb);
345             len4 = get_le16(pb);
346             len5 = get_le16(pb);
347             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
348             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
349             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
350             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
351             url_fskip(pb, len5);
352         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
353             int stream_count = get_le16(pb);
354             int j;
355
356 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
357 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
358             for(j = 0; j < stream_count; j++) {
359                 int flags, bitrate, stream_id;
360
361                 flags= get_le16(pb);
362                 bitrate= get_le32(pb);
363                 stream_id= (flags & 0x7f);
364 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
365                 asf->stream_bitrates[stream_id-1]= bitrate;
366             }
367        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
368                 int desc_count, i;
369
370                 desc_count = get_le16(pb);
371                 for(i=0;i<desc_count;i++)
372                 {
373                         int name_len,value_type,value_len;
374                         uint64_t value_num = 0;
375                         char name[1024];
376
377                         name_len = get_le16(pb);
378                         get_str16_nolen(pb, name_len, name, sizeof(name));
379                         value_type = get_le16(pb);
380                         value_len = get_le16(pb);
381                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
382                         {
383                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
384                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
385                                 else url_fskip(pb, value_len);
386                         }
387                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
388                         {
389                                 value_num= get_value(pb, value_type);
390                                 if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
391                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
392                         }
393                 }
394         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
395             int n, stream_num, name_len, value_len, value_type, value_num;
396             n = get_le16(pb);
397
398             for(i=0;i<n;i++) {
399                 char name[1024];
400
401                 get_le16(pb); //lang_list_index
402                 stream_num= get_le16(pb);
403                 name_len=   get_le16(pb);
404                 value_type= get_le16(pb);
405                 value_len=  get_le32(pb);
406
407                 get_str16_nolen(pb, name_len, name, sizeof(name));
408 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
409                 value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
410                 url_fskip(pb, value_len - 2);
411
412                 if(stream_num<128){
413                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
414                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
415                 }
416             }
417         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
418             int ext_len, payload_ext_ct, stream_ct;
419             uint32_t ext_d;
420             int64_t pos_ex_st;
421             pos_ex_st = url_ftell(pb);
422
423             get_le64(pb); // starttime
424             get_le64(pb); // endtime
425             get_le32(pb); // leak-datarate
426             get_le32(pb); // bucket-datasize
427             get_le32(pb); // init-bucket-fullness
428             get_le32(pb); // alt-leak-datarate
429             get_le32(pb); // alt-bucket-datasize
430             get_le32(pb); // alt-init-bucket-fullness
431             get_le32(pb); // max-object-size
432             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
433             get_le16(pb); // stream-num
434             get_le16(pb); // stream-language-id-index
435             get_le64(pb); // avg frametime in 100ns units
436             stream_ct = get_le16(pb); //stream-name-count
437             payload_ext_ct = get_le16(pb); //payload-extension-system-count
438
439             for (i=0; i<stream_ct; i++){
440                 get_le16(pb);
441                 ext_len = get_le16(pb);
442                 url_fseek(pb, ext_len, SEEK_CUR);
443             }
444
445             for (i=0; i<payload_ext_ct; i++){
446                 get_guid(pb, &g);
447                 ext_d=get_le16(pb);
448                 ext_len=get_le32(pb);
449                 url_fseek(pb, ext_len, SEEK_CUR);
450             }
451
452             // there could be a optional stream properties object to follow
453             // if so the next iteration will pick it up
454         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
455             int v1, v2;
456             get_guid(pb, &g);
457             v1 = get_le32(pb);
458             v2 = get_le16(pb);
459 #if 0
460         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
461             int len, v1, n, num;
462             char str[256], *q;
463             char tag[16];
464
465             get_guid(pb, &g);
466             print_guid(&g);
467
468             n = get_le32(pb);
469             for(i=0;i<n;i++) {
470                 num = get_le16(pb); /* stream number */
471                 get_str16(pb, str, sizeof(str));
472                 get_str16(pb, str, sizeof(str));
473                 len = get_le16(pb);
474                 q = tag;
475                 while (len > 0) {
476                     v1 = get_byte(pb);
477                     if ((q - tag) < sizeof(tag) - 1)
478                         *q++ = v1;
479                     len--;
480                 }
481                 *q = '\0';
482             }
483 #endif
484         } else if (url_feof(pb)) {
485             goto fail;
486         } else {
487             url_fseek(pb, gsize - 24, SEEK_CUR);
488         }
489     }
490     get_guid(pb, &g);
491     get_le64(pb);
492     get_byte(pb);
493     get_byte(pb);
494     if (url_feof(pb))
495         goto fail;
496     asf->data_offset = url_ftell(pb);
497     asf->packet_size_left = 0;
498
499
500     for(i=0; i<128; i++){
501         int stream_num= asf->asfid2avid[i];
502         if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){
503             AVCodecContext *codec= s->streams[stream_num]->codec;
504             av_reduce(&codec->sample_aspect_ratio.num,
505                     &codec->sample_aspect_ratio.den,
506                     dar[i].num, dar[i].den, INT_MAX);
507 //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);
508         }
509     }
510
511     return 0;
512
513  fail:
514      for(i=0;i<s->nb_streams;i++) {
515         AVStream *st = s->streams[i];
516         if (st) {
517             av_free(st->priv_data);
518             av_free(st->codec->extradata);
519         }
520         av_free(st);
521     }
522     return -1;
523 }
524
525 #define DO_2BITS(bits, var, defval) \
526     switch (bits & 3) \
527     { \
528     case 3: var = get_le32(pb); rsize += 4; break; \
529     case 2: var = get_le16(pb); rsize += 2; break; \
530     case 1: var = get_byte(pb); rsize++; break; \
531     default: var = defval; break; \
532     }
533
534 /**
535  *
536  * @return <0 in case of an error
537  */
538 static int asf_get_packet(AVFormatContext *s)
539 {
540     ASFContext *asf = s->priv_data;
541     ByteIOContext *pb = &s->pb;
542     uint32_t packet_length, padsize;
543     int rsize = 9;
544     int c, d, e, off;
545
546     off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
547
548     c=d=e=-1;
549     while(off-- > 0){
550         c=d; d=e;
551         e= get_byte(pb);
552         if(c == 0x82 && !d && !e)
553             break;
554     }
555
556     if (c != 0x82) {
557         if (!url_feof(pb))
558             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
559     }
560     if ((c & 0x0f) == 2) { // always true for now
561         if (d || e) {
562             if (!url_feof(pb))
563                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
564             return -1;
565         }
566         d= get_byte(pb);
567         e= get_byte(pb);
568         rsize+=2;
569 /*    }else{
570         if (!url_feof(pb))
571             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
572         return AVERROR_IO;*/
573     }
574
575     asf->packet_flags = d;
576     asf->packet_property = e;
577
578     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
579     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
580     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
581
582     //the following checks prevent overflows and infinite loops
583     if(packet_length >= (1U<<29)){
584         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
585         return -1;
586     }
587     if(padsize >= packet_length){
588         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
589         return -1;
590     }
591
592     asf->packet_timestamp = get_le32(pb);
593     get_le16(pb); /* duration */
594     // rsize has at least 11 bytes which have to be present
595
596     if (asf->packet_flags & 0x01) {
597         asf->packet_segsizetype = get_byte(pb); rsize++;
598         asf->packet_segments = asf->packet_segsizetype & 0x3f;
599     } else {
600         asf->packet_segments = 1;
601         asf->packet_segsizetype = 0x80;
602     }
603     asf->packet_size_left = packet_length - padsize - rsize;
604     if (packet_length < asf->hdr.min_pktsize)
605         padsize += asf->hdr.min_pktsize - packet_length;
606     asf->packet_padsize = padsize;
607 #ifdef DEBUG
608     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
609 #endif
610     return 0;
611 }
612
613 /**
614  *
615  * @return <0 if error
616  */
617 static int asf_read_frame_header(AVFormatContext *s){
618     ASFContext *asf = s->priv_data;
619     ByteIOContext *pb = &s->pb;
620     int rsize = 1;
621     int num = get_byte(pb);
622     int64_t ts0, ts1;
623
624     asf->packet_segments--;
625     asf->packet_key_frame = num >> 7;
626     asf->stream_index = asf->asfid2avid[num & 0x7f];
627     // sequence should be ignored!
628     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
629     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
630     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
631 //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);
632     if (asf->packet_replic_size >= 8) {
633         asf->packet_obj_size = get_le32(pb);
634         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
635             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
636             return -1;
637         }
638         asf->packet_frag_timestamp = get_le32(pb); // timestamp
639         if(asf->packet_replic_size >= 8+38+4){
640 //            for(i=0; i<asf->packet_replic_size-8; i++)
641 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
642 //            av_log(s, AV_LOG_DEBUG, "\n");
643             url_fskip(pb, 10);
644             ts0= get_le64(pb);
645             ts1= get_le64(pb);
646             url_fskip(pb, 12);
647             get_le32(pb);
648             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
649             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
650             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
651         }else
652             url_fskip(pb, asf->packet_replic_size - 8);
653         rsize += asf->packet_replic_size; // FIXME - check validity
654     } else if (asf->packet_replic_size==1){
655         // multipacket - frag_offset is begining timestamp
656         asf->packet_time_start = asf->packet_frag_offset;
657         asf->packet_frag_offset = 0;
658         asf->packet_frag_timestamp = asf->packet_timestamp;
659
660         asf->packet_time_delta = get_byte(pb);
661         rsize++;
662     }else if(asf->packet_replic_size!=0){
663         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
664         return -1;
665     }
666     if (asf->packet_flags & 0x01) {
667         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
668         if(asf->packet_frag_size > asf->packet_size_left - rsize){
669             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
670             return -1;
671         }
672         //printf("Fragsize %d\n", asf->packet_frag_size);
673     } else {
674         asf->packet_frag_size = asf->packet_size_left - rsize;
675         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
676     }
677     if (asf->packet_replic_size == 1) {
678         asf->packet_multi_size = asf->packet_frag_size;
679         if (asf->packet_multi_size > asf->packet_size_left)
680             return -1;
681     }
682     asf->packet_size_left -= rsize;
683     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
684
685     return 0;
686 }
687
688 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
689 {
690     ASFContext *asf = s->priv_data;
691     ASFStream *asf_st = 0;
692     ByteIOContext *pb = &s->pb;
693     //static int pc = 0;
694     for (;;) {
695         if(url_feof(pb))
696             return AVERROR_IO;
697         if (asf->packet_size_left < FRAME_HEADER_SIZE
698             || asf->packet_segments < 1) {
699             //asf->packet_size_left <= asf->packet_padsize) {
700             int ret = asf->packet_size_left + asf->packet_padsize;
701             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
702             assert(ret>=0);
703             /* fail safe */
704             url_fskip(pb, ret);
705
706             asf->packet_pos= url_ftell(&s->pb);
707             if (asf->data_object_size != (uint64_t)-1 &&
708                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
709                 return AVERROR_IO; /* Do not exceed the size of the data object */
710             ret = asf_get_packet(s);
711             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
712             if (ret < 0)
713                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
714             asf->packet_time_start = 0;
715             continue;
716         }
717         if (asf->packet_time_start == 0) {
718             if(asf_read_frame_header(s) < 0){
719                 asf->packet_segments= 0;
720                 continue;
721             }
722             if (asf->stream_index < 0
723                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
724                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
725                 ) {
726                 asf->packet_time_start = 0;
727                 /* unhandled packet (should not happen) */
728                 url_fskip(pb, asf->packet_frag_size);
729                 asf->packet_size_left -= asf->packet_frag_size;
730                 if(asf->stream_index < 0)
731                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
732                 continue;
733             }
734             asf->asf_st = s->streams[asf->stream_index]->priv_data;
735         }
736         asf_st = asf->asf_st;
737
738         if (asf->packet_replic_size == 1) {
739             // frag_offset is here used as the begining timestamp
740             asf->packet_frag_timestamp = asf->packet_time_start;
741             asf->packet_time_start += asf->packet_time_delta;
742             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
743             asf->packet_size_left--;
744             asf->packet_multi_size--;
745             if (asf->packet_multi_size < asf->packet_obj_size)
746             {
747                 asf->packet_time_start = 0;
748                 url_fskip(pb, asf->packet_multi_size);
749                 asf->packet_size_left -= asf->packet_multi_size;
750                 continue;
751             }
752             asf->packet_multi_size -= asf->packet_obj_size;
753             //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);
754         }
755         if (   asf_st->pkt.size != asf->packet_obj_size
756             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
757             if(asf_st->pkt.data){
758                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
759                 asf_st->frag_offset = 0;
760                 av_free_packet(&asf_st->pkt);
761             }
762             /* new packet */
763             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
764             asf_st->seq = asf->packet_seq;
765             asf_st->pkt.pts = asf->packet_frag_timestamp;
766             asf_st->pkt.stream_index = asf->stream_index;
767             asf_st->pkt.pos =
768             asf_st->packet_pos= asf->packet_pos;
769 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
770 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
771 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
772             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
773                 asf->packet_key_frame = 1;
774             if (asf->packet_key_frame)
775                 asf_st->pkt.flags |= PKT_FLAG_KEY;
776         }
777
778         /* read data */
779         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
780         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
781         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
782         asf->packet_size_left -= asf->packet_frag_size;
783         if (asf->packet_size_left < 0)
784             continue;
785
786         if(   asf->packet_frag_offset >= asf_st->pkt.size
787            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
788             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
789                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
790             continue;
791         }
792
793         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
794                    asf->packet_frag_size);
795         asf_st->frag_offset += asf->packet_frag_size;
796         /* test if whole packet is read */
797         if (asf_st->frag_offset == asf_st->pkt.size) {
798             /* return packet */
799             if (asf_st->ds_span > 1) {
800               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
801                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
802               }else{
803                 /* packet descrambling */
804                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
805                 if (newdata) {
806                     int offset = 0;
807                     while (offset < asf_st->pkt.size) {
808                         int off = offset / asf_st->ds_chunk_size;
809                         int row = off / asf_st->ds_span;
810                         int col = off % asf_st->ds_span;
811                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
812                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
813
814                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
815                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
816                         memcpy(newdata + offset,
817                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
818                                asf_st->ds_chunk_size);
819                         offset += asf_st->ds_chunk_size;
820                     }
821                     av_free(asf_st->pkt.data);
822                     asf_st->pkt.data = newdata;
823                 }
824               }
825             }
826             asf_st->frag_offset = 0;
827             *pkt= asf_st->pkt;
828             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
829             asf_st->pkt.size = 0;
830             asf_st->pkt.data = 0;
831             break; // packet completed
832         }
833     }
834     return 0;
835 }
836
837 static int asf_read_close(AVFormatContext *s)
838 {
839     int i;
840
841     for(i=0;i<s->nb_streams;i++) {
842         AVStream *st = s->streams[i];
843         av_free(st->priv_data);
844         av_free(st->codec->palctrl);
845     }
846     return 0;
847 }
848
849 // Added to support seeking after packets have been read
850 // If information is not reset, read_packet fails due to
851 // leftover information from previous reads
852 static void asf_reset_header(AVFormatContext *s)
853 {
854     ASFContext *asf = s->priv_data;
855     ASFStream *asf_st;
856     int i;
857
858     asf->packet_nb_frames = 0;
859     asf->packet_size_left = 0;
860     asf->packet_segments = 0;
861     asf->packet_flags = 0;
862     asf->packet_property = 0;
863     asf->packet_timestamp = 0;
864     asf->packet_segsizetype = 0;
865     asf->packet_segments = 0;
866     asf->packet_seq = 0;
867     asf->packet_replic_size = 0;
868     asf->packet_key_frame = 0;
869     asf->packet_padsize = 0;
870     asf->packet_frag_offset = 0;
871     asf->packet_frag_size = 0;
872     asf->packet_frag_timestamp = 0;
873     asf->packet_multi_size = 0;
874     asf->packet_obj_size = 0;
875     asf->packet_time_delta = 0;
876     asf->packet_time_start = 0;
877
878     for(i=0; i<s->nb_streams; i++){
879         asf_st= s->streams[i]->priv_data;
880         av_free_packet(&asf_st->pkt);
881         asf_st->frag_offset=0;
882         asf_st->seq=0;
883     }
884     asf->asf_st= NULL;
885 }
886
887 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
888 {
889     ASFContext *asf = s->priv_data;
890     AVPacket pkt1, *pkt = &pkt1;
891     ASFStream *asf_st;
892     int64_t pts;
893     int64_t pos= *ppos;
894     int i;
895     int64_t start_pos[s->nb_streams];
896
897     for(i=0; i<s->nb_streams; i++){
898         start_pos[i]= pos;
899     }
900
901     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
902     *ppos= pos;
903     url_fseek(&s->pb, pos, SEEK_SET);
904
905 //printf("asf_read_pts\n");
906     asf_reset_header(s);
907     for(;;){
908         if (av_read_frame(s, pkt) < 0){
909             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
910             return AV_NOPTS_VALUE;
911         }
912
913         pts= pkt->pts;
914
915         av_free_packet(pkt);
916         if(pkt->flags&PKT_FLAG_KEY){
917             i= pkt->stream_index;
918
919             asf_st= s->streams[i]->priv_data;
920
921 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
922             pos= asf_st->packet_pos;
923
924             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
925             start_pos[i]= asf_st->packet_pos + 1;
926
927             if(pkt->stream_index == stream_index)
928                break;
929         }
930     }
931
932     *ppos= pos;
933 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
934
935     return pts;
936 }
937
938 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
939 {
940     GUID g;
941     ASFContext *asf = s->priv_data;
942     int64_t gsize, itime;
943     int64_t pos, current_pos, index_pts;
944     int i;
945     int pct,ict;
946
947     current_pos = url_ftell(&s->pb);
948
949     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
950     get_guid(&s->pb, &g);
951     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
952         gsize = get_le64(&s->pb);
953         get_guid(&s->pb, &g);
954         itime=get_le64(&s->pb);
955         pct=get_le32(&s->pb);
956         ict=get_le32(&s->pb);
957         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
958
959         for (i=0;i<ict;i++){
960             int pktnum=get_le32(&s->pb);
961             int pktct =get_le16(&s->pb);
962             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
963
964             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
965             index_pts=av_rescale(itime, i, 10000);
966
967             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
968         }
969         asf->index_read= 1;
970     }
971     url_fseek(&s->pb, current_pos, SEEK_SET);
972 }
973
974 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
975 {
976     ASFContext *asf = s->priv_data;
977     AVStream *st = s->streams[stream_index];
978     int64_t pos;
979     int index;
980
981     if (asf->packet_size <= 0)
982         return -1;
983
984     if (!asf->index_read)
985         asf_build_simple_index(s, stream_index);
986
987     if(!(asf->index_read && st->index_entries)){
988         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
989             return -1;
990     }else{
991         index= av_index_search_timestamp(st, pts, flags);
992         if(index<0)
993             return -1;
994
995         /* find the position */
996         pos = st->index_entries[index].pos;
997         pts = st->index_entries[index].timestamp;
998
999     // various attempts to find key frame have failed so far
1000     //    asf_reset_header(s);
1001     //    url_fseek(&s->pb, pos, SEEK_SET);
1002     //    key_pos = pos;
1003     //     for(i=0;i<16;i++){
1004     //         pos = url_ftell(&s->pb);
1005     //         if (av_read_frame(s, &pkt) < 0){
1006     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1007     //             return -1;
1008     //         }
1009     //         asf_st = s->streams[stream_index]->priv_data;
1010     //         pos += st->parser->frame_offset;
1011     //
1012     //         if (pkt.size > b) {
1013     //             b = pkt.size;
1014     //             key_pos = pos;
1015     //         }
1016     //
1017     //         av_free_packet(&pkt);
1018     //     }
1019
1020         /* do the seek */
1021         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1022         url_fseek(&s->pb, pos, SEEK_SET);
1023     }
1024     asf_reset_header(s);
1025     return 0;
1026 }
1027
1028 AVInputFormat asf_demuxer = {
1029     "asf",
1030     "asf format",
1031     sizeof(ASFContext),
1032     asf_probe,
1033     asf_read_header,
1034     asf_read_packet,
1035     asf_read_close,
1036     asf_read_seek,
1037     asf_read_pts,
1038 };