1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
// ASF file parser for DEMUXER v0.3 by A'rpi/ESP-team
#include <stdio.h>
#include <stdlib.h>
extern int verbose; // defined in mplayer.c
#include "stream.h"
#include "demuxer.h"
// defined at asfheader.c:
extern unsigned char* asf_packet;
extern int asf_scrambling_h;
extern int asf_scrambling_w;
extern int asf_scrambling_b;
extern int asf_packetsize;
// based on asf file-format doc by Eugene [http://divx.euro.ru]
//static float avi_pts_frametime=1.0f/25.0f;
//static float avi_audio_pts=0;
//static float avi_video_pts=0;
//static int skip_video_frames=0;
//BB: Moved to asf.h --------- FROM HERE --------
#ifndef STREAMING
typedef struct __attribute__((packed)) {
unsigned char streamno;
unsigned char seq;
unsigned long x;
unsigned char flag;
} ASF_segmhdr_t;
#else
#include "asf.h"
#endif
//BB: Moved to asf.h --------- TO HERE --------
static void asf_descrambling(unsigned char *src,int len){
unsigned char *dst=malloc(len);
unsigned char *s2=src;
int i=0,x,y;
while(len-i>=asf_scrambling_h*asf_scrambling_w*asf_scrambling_b){
// printf("descrambling! (w=%d b=%d)\n",w,asf_scrambling_b);
//i+=asf_scrambling_h*asf_scrambling_w;
for(x=0;x<asf_scrambling_w;x++)
for(y=0;y<asf_scrambling_h;y++){
memcpy(dst+i,s2+(y*asf_scrambling_w+x)*asf_scrambling_b,asf_scrambling_b);
i+=asf_scrambling_b;
}
s2+=asf_scrambling_h*asf_scrambling_w*asf_scrambling_b;
}
//if(i<len) memcpy(dst+i,src+i,len-i);
memcpy(src,dst,i);
free(dst);
}
static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,int id,int seq,unsigned long time,unsigned short dur,int offs){
demux_stream_t *ds=NULL;
if(verbose>=4) printf("demux_asf.read_packet: id=%d seq=%d len=%d\n",id,seq,len);
if(demux->video->id==-1)
if(demux->v_streams[id])
demux->video->id=id;
if(demux->audio->id==-1)
if(demux->a_streams[id])
demux->audio->id=id;
if(id==demux->audio->id){
// audio
ds=demux->audio;
if(!ds->sh){
ds->sh=demux->a_streams[id];
if(verbose) printf("Auto-selected ASF audio ID = %d\n",ds->id);
}
} else
if(id==demux->video->id){
// video
ds=demux->video;
if(!ds->sh){
ds->sh=demux->v_streams[id];
if(verbose) printf("Auto-selected ASF video ID = %d\n",ds->id);
}
}
if(ds){
if(ds->asf_packet){
if(ds->asf_seq!=seq){
// closed segment, finalize packet:
if(ds==demux->audio)
if(asf_scrambling_h>1 && asf_scrambling_w>1)
asf_descrambling(ds->asf_packet->buffer,ds->asf_packet->len);
ds_add_packet(ds,ds->asf_packet);
ds->asf_packet=NULL;
} else {
// append data to it!
demux_packet_t* dp=ds->asf_packet;
if(dp->len!=offs && offs!=-1) printf("warning! fragment.len=%d BUT next fragment offset=%d \n",dp->len,offs);
dp->buffer=realloc(dp->buffer,dp->len+len);
memcpy(dp->buffer+dp->len,data,len);
if(verbose>=4) printf("data appended! %d+%d\n",dp->len,len);
dp->len+=len;
// we are ready now.
return 1;
}
}
// create new packet:
{ demux_packet_t* dp;
if(offs>0){
if(verbose) printf("warning! broken fragment, %d bytes missing \n",offs);
return 0;
}
dp=new_demux_packet(len);
memcpy(dp->buffer,data,len);
dp->pts=time*0.001f;
// if(ds==demux->video) printf("ASF time: %8d dur: %5d \n",time,dur);
dp->pos=demux->filepos;
ds->asf_packet=dp;
ds->asf_seq=seq;
// we are ready now.
return 1;
}
}
return 0;
}
//static int num_elementary_packets100=0;
//static int num_elementary_packets101=0;
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_asf_fill_buffer(demuxer_t *demux){
demux->filepos=stream_tell(demux->stream);
if(demux->filepos>=demux->movi_end){
demux->stream->eof=1;
return 0;
}
stream_read(demux->stream,asf_packet,asf_packetsize);
if(demux->stream->eof) return 0; // EOF
if(asf_packet[0]==0x82){
unsigned char flags=asf_packet[3];
unsigned char segtype=asf_packet[4];
unsigned char* p=&asf_packet[5];
unsigned char* p_end=p+asf_packetsize;
unsigned long time;
unsigned short duration;
int segs=1;
unsigned char segsizetype=0x80;
int seg;
int padding=0;
int plen;
if(verbose>1){
int i;
for(i=0;i<16;i++) printf(" %02X",asf_packet[i]);
printf("\n");
}
//if(segtype!=0x5d) printf("Warning! packet[4] != 0x5d \n");
// Calculate packet size (plen):
if(flags&0x40){
// Explicit (absoulte) packet size
plen=p[0]|(p[1]<<8); p+=2;
if(verbose>1)printf("Explicit packet size specified: %d \n",plen);
if(plen>asf_packetsize) printf("Warning! plen>packetsize! (%d>%d) \n",plen,asf_packetsize);
if(flags&(8|16)){
padding=p[0];p++;
if(flags&16){ padding|=p[0]<<8; p++;}
if(verbose)printf("Warning! explicit=%d padding=%d \n",plen,asf_packetsize-padding);
}
} else {
// Padding (relative) size
if(flags&8){
padding=p[0];++p;
} else
if(flags&16){
padding=p[0]|(p[1]<<8);p+=2;
}
plen=asf_packetsize-padding;
}
time=*((unsigned long*)p);p+=4;
duration=*((unsigned short*)p);p+=2;
if(flags&1){
segsizetype=p[0] & 0xC0;
segs=p[0] & 0x3F;
++p;
}
if(verbose>=4) printf("%08X: flag=%02X segs=%d pad=%d time=%ld dur=%d\n",
demux->filepos,flags,segs,padding,time,duration);
for(seg=0;seg<segs;seg++){
//ASF_segmhdr_t* sh;
unsigned char streamno;
unsigned char seq;
int len;
unsigned long x;
unsigned char type;
unsigned long time2;
if(p>=p_end) printf("Warning! invalid packet 1, sig11 coming soon...\n");
if(verbose>1){
int i;
printf("seg %d:",seg);
for(i=0;i<16;i++) printf(" %02X",p[i]);
printf("\n");
}
streamno=p[0]&0x7F;
seq=p[1];
p+=2;
switch(segtype){
case 0x55:
x=*((unsigned char*)p);
p++;
break;
case 0x59:
x=*((unsigned short*)p);
p+=2;
break;
case 0x5D:
x=*((unsigned long*)p);
p+=4;
break;
default:
printf("Warning! unknown segtype == 0x%2X \n",segtype);
}
type=p[0]; p++; // 0x01: grouping 0x08: single
switch(type){
case 0x01:
//printf("grouping: %02X \n",p[0]);
++p; // skip unknown byte
break;
case 0x08:
//printf("!!! obj_length = %d\n",*((unsigned long*)p));
p+=4;
time2=*((unsigned long*)p);p+=4;
break;
default:
printf("unknown segment type: 0x%02X \n",type);
}
if(flags&1){
// multiple segments
if(segsizetype==0x40){
len=*((unsigned char*)p);p++; // 1 byte
} else {
len=*((unsigned short*)p);p+=2; // 2 byte
}
} else {
// single segment
len=plen-(p-asf_packet);
}
if(len<0 || (p+len)>=p_end){
printf("ASF_parser: warning! segment len=%d\n",len);
}
if(verbose>=4) printf(" seg #%d: streamno=%d seq=%d type=%02X len=%d\n",seg,streamno,seq,type,len);
switch(type){
case 0x01:
// GROUPING:
//printf("ASF_parser: warning! grouping (flag=1) not yet supported!\n",len);
//printf(" total: %d \n",len);
while(len>0){
int len2=p[0];
p++;
//printf(" group part: %d bytes\n",len2);
demux_asf_read_packet(demux,p,len2,streamno,seq,x,duration,-1);
p+=len2;
len-=len2+1;
}
if(len!=0){
printf("ASF_parser: warning! groups total != len\n");
}
break;
case 0x08:
// NO GROUPING:
//printf("fragment offset: %d \n",sh->x);
demux_asf_read_packet(demux,p,len,streamno,seq,time2,duration,x);
p+=len;
break;
}
} // for segs
return 1; // success
}
printf("%08X: UNKNOWN TYPE %02X %02X %02X %02X %02X...\n",demux->filepos,asf_packet[0],asf_packet[1],asf_packet[2],asf_packet[3],asf_packet[4]);
return 0;
}
|
