github publish

VIDEO/OLD/MGIFMEM.C

@@ -0,0 +1,209 @@
+#include <stdio.h>
+#include <memman.h>
+#include <mem.h>
+
+#define MGIF "MGIF"
+#define LZW_MAX_CODES  4096
+#define LZW_BUFFER 64000
+
+
+MGIF_PROC show_proc;
+int mgif_frames;int cur_frame;
+
+typedef struct mgif_header
+    {
+    char sign[4];
+    char year[2];
+    char eof;
+    word ver;
+    long frames;
+    word snd_chans;
+    int snd_freq;
+    short ampl_table[256];
+    short reserved[32];
+    };
+
+
+typedef struct double_s
+  {
+  short group,chr,first,next;
+  }DOUBLE_S;
+
+typedef DOUBLE_S CODE_TABLE[LZW_MAX_CODES];
+
+DOUBLE_S *compress_dic=NULL;
+void *lzw_buffer=NULL;
+int clear_code;
+int end_code;
+int free_code;
+int nextgroup;
+int bitsize,init_bitsize;
+char old_value=0;
+
+void do_clear_code()
+  {
+  int i;
+
+  old_value=0;
+  nextgroup=free_code;
+  bitsize=init_bitsize;
+  for(i=0;i<clear_code;i++)
+     {
+     DOUBLE_S *p;
+     p=&compress_dic[i];
+     p->group=i;p->chr=-1;p->next=-1;p->first=-1;
+     }
+  }
+
+void reinit_lzw()
+  {
+  do_clear_code();
+  }
+
+void init_lzw_compressor(int dic_size)
+  {
+
+  if (compress_dic!=NULL)compress_dic=(CODE_TABLE *)getmem(sizeof(CODE_TABLE));
+  clear_code=1<<dic_size;
+  end_code=clear_code+1;
+  free_code=end_code+1;
+  nextgroup=free_code;
+  init_bitsize=bitsize=dic_size+1;
+  do_clear_code();
+  }
+
+
+void done_lzw_compressor()
+  {
+  free(compress_dic);
+  compress_dic=NULL;
+  }
+
+void mgif_install_proc(MGIF_PROC proc)
+  {
+  show_proc=proc;
+  }
+
+void *open_mgif(void *mgif) //vraci ukazatel na prvni frame
+  {
+  char *c;
+  struct mgif_header *mgh;
+
+  c=mgif;
+  if (strncmp(c,MGIF)) return NULL;
+  mgh=mgif;
+  mgif_frames=mgh->frames;
+  cur_frame=0;
+  c+=sizeof(*mgh);
+  init_lzw_compressor(8);
+  if (lzw_buffer==NULL) lzw_buffer=getmem(LZW_BUFFER);
+  return c;
+  }
+
+void close_mgif()           //dealokuje buffery pro prehravani
+  {
+  done_lzw_compressor();
+  free(lzw_buffer);
+  lzw_buffer=NULL;
+  }
+
+
+int input_code(void *source,long *bitepos,int bitsize,int mask);
+#pragma aux input_code parm [esi][edi][ebx][edx]=\
+     "mov     ecx,[edi]"\
+     "mov     eax,ecx"\
+     "shr     eax,3"\
+     "mov     eax,[esi+eax]"\
+     "and     cl,7"\
+     "shr     eax,cl"\
+     "and     eax,edx"\
+     "add     [edi],ebx"\
+    value[eax] modify [ecx];
+
+
+void de_add_code(DOUBLE_S *p,int *mask)
+  {
+  DOUBLE_S *q;
+
+  q=&compress_dic[nextgroup];q->group=p->group;q->chr=p->chr;q->first=compress_dic[p->group].first+1;
+  nextgroup++;
+  if (nextgroup==*mask)
+     {
+     *mask=(*mask<<1)+1;
+     bitsize++;
+     }
+  }
+
+
+char fast_expand_code(int code,char **target);
+#pragma aux fast_expand_code parm[eax][edi] modify [esi ecx] value [bl]
+
+void lzw_decode(void *source,char *target)
+  {
+  long bitpos=0;
+  int code,old,i;
+  DOUBLE_S p;
+  int old_first;
+  int mask=0xff;
+
+
+  for(i=0;i<LZW_MAX_CODES;i++) compress_dic[i].first=0;
+  clear:
+  old_value=0;
+  nextgroup=free_code;
+  bitsize=init_bitsize;
+  mask=(1<<bitsize)-1;
+  code=input_code(source,&bitpos,bitsize,mask);
+  old_first=fast_expand_code(code,&target);
+  old=code;
+  while ((code=input_code(source,&bitpos,bitsize,mask))!=end_code)
+     {
+     if (code==clear_code)
+        {
+        goto clear;
+        }
+     else if (code<nextgroup)
+        {
+        old_first=fast_expand_code(code,&target);
+        p.group=old;
+        p.chr=old_first;
+        de_add_code(&p,&mask);
+        old=code;
+        }
+     else
+        {
+        p.group=old;
+        p.chr=old_first;
+        de_add_code(&p,&mask);
+        old_first=fast_expand_code(code,&target);
+        old=code;
+        }
+     }
+    }
+
+void *mgif_play(void *mgif) //dekoduje a zobrazi frame
+  {
+  char *pf,*pc,*ff;
+  char acts,size,act,csize;
+
+  pf=mgif;
+  acts=*pf++;
+  size=*(int *)pf & 0xffffff;
+  pf+=3;pc=pf;pf+=size;
+  do
+     {
+     act=*pc++;csize=*(int *)pc & 0xffffff;pc+=3;
+     if (act==MGIF_LZW || act==MGIF_DELTA)
+        {
+        ff=lzw_buffer;
+        lzw_decode(pc,ff);
+        }
+     else
+        ff=pc;
+     show_proc(act,ff);
+     pc+=csize;
+     }
+  while (--acts);
+  return pf;
+  }
+