From d34041569e71fc9bd772354e94dc9d16061072a5 Mon Sep 17 00:00:00 2001
From: arpi_esp <arpi_esp@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sat, 24 Feb 2001 20:28:24 +0000
Subject: Initial revision

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 stream.c | 203 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100644 stream.c

(limited to 'stream.c')

diff --git a/stream.c b/stream.c
new file mode 100644
index 0000000000..3c44a0a30d
--- /dev/null
+++ b/stream.c
@@ -0,0 +1,203 @@
+
+#include "vcd_read.c"
+
+//=================== STREAMER =========================
+
+#define STREAM_BUFFER_SIZE 4096
+
+#define STREAMTYPE_FILE 0
+#define STREAMTYPE_VCD  1
+
+typedef struct {
+  int fd;
+  long pos;
+  int eof;
+  int type; // 0=file 1=VCD
+  unsigned int buf_pos,buf_len;
+  unsigned char buffer[STREAM_BUFFER_SIZE];
+} stream_t;
+
+int stream_fill_buffer(stream_t *s){
+  int len;
+  if(s->eof){ s->buf_pos=s->buf_len=0; return 0; }
+  switch(s->type){
+  case STREAMTYPE_FILE:
+    len=read(s->fd,s->buffer,STREAM_BUFFER_SIZE);break;
+  case STREAMTYPE_VCD:
+#ifdef VCD_CACHE
+    len=vcd_cache_read(s->fd,s->buffer);break;
+#else
+    len=vcd_read(s->fd,s->buffer);break;
+#endif
+  default: len=0;
+  }
+  if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; return 0; }
+  s->buf_pos=0;
+  s->buf_len=len;
+  s->pos+=len;
+//  printf("[%d]",len);fflush(stdout);
+  return len;
+}
+
+inline unsigned int stream_read_char(stream_t *s){
+  return (s->buf_pos<s->buf_len)?s->buffer[s->buf_pos++]:
+    (stream_fill_buffer(s)?s->buffer[s->buf_pos++]:0);
+//  if(s->buf_pos<s->buf_len) return s->buffer[s->buf_pos++];
+//  stream_fill_buffer(s);
+//  if(s->buf_pos<s->buf_len) return s->buffer[s->buf_pos++];
+//  return 0; // EOF
+}
+
+inline unsigned int stream_read_word(stream_t *s){
+  int x,y;
+  x=stream_read_char(s);
+  y=stream_read_char(s);
+  return (x<<8)|y;
+}
+
+inline unsigned int stream_read_dword(stream_t *s){
+  unsigned int y;
+  y=stream_read_char(s);
+  y=(y<<8)|stream_read_char(s);
+  y=(y<<8)|stream_read_char(s);
+  y=(y<<8)|stream_read_char(s);
+  return y;
+}
+
+inline unsigned int stream_read_word_le(stream_t *s){
+  int x,y;
+  x=stream_read_char(s);
+  y=stream_read_char(s);
+  return (y<<8)|x;
+}
+
+inline unsigned int stream_read_dword_le(stream_t *s){
+  unsigned int y;
+  y=stream_read_char(s);
+  y|=stream_read_char(s)<<8;
+  y|=stream_read_char(s)<<16;
+  y|=stream_read_char(s)<<24;
+  return y;
+}
+
+inline void stream_read(stream_t *s,char* mem,int len){
+  while(len>0){
+    int x;
+    x=s->buf_len-s->buf_pos;
+    if(x==0){
+      if(!stream_fill_buffer(s)) return; // EOF
+      x=s->buf_len-s->buf_pos;
+    }
+    if(s->buf_pos>s->buf_len) printf("stream_read: WARNING! s->buf_pos>s->buf_len\n");
+    if(x>len) x=len;
+    memcpy(mem,&s->buffer[s->buf_pos],x);
+    s->buf_pos+=x; mem+=x; len-=x;
+  }
+}
+
+inline int stream_eof(stream_t *s){
+  return s->eof;
+}
+
+inline int stream_tell(stream_t *s){
+  return s->pos+s->buf_pos-s->buf_len;
+}
+
+inline int stream_seek(stream_t *s,unsigned int pos){
+unsigned int newpos;
+
+  if(verbose>=3) printf("seek to 0x%X\n",pos);
+
+  if(pos<s->pos){
+    int x=pos-(s->pos-s->buf_len);
+    if(x>=0){
+      s->buf_pos=x;
+//      putchar('*');fflush(stdout);
+      return 1;
+    }
+  }
+
+if(verbose>=3){
+  printf("s->pos=%X  newpos=%X  new_bufpos=%X  buflen=%X  \n",
+    s->pos,newpos,pos,s->buf_len);
+}
+
+  s->buf_pos=s->buf_len=0;
+
+  switch(s->type){
+  case STREAMTYPE_FILE:
+    newpos=pos&(~4095);break;
+  case STREAMTYPE_VCD:
+    newpos=(pos/VCD_SECTOR_DATA)*VCD_SECTOR_DATA;break;
+  }
+
+  pos-=newpos;
+
+if(newpos==0 || newpos!=s->pos){
+  s->pos=newpos; // real seek
+  switch(s->type){
+  case STREAMTYPE_FILE:
+    if(lseek(s->fd,s->pos,SEEK_SET)<0) s->eof=1;
+    break;
+  case STREAMTYPE_VCD:
+#ifdef VCD_CACHE
+    vcd_cache_seek(s->pos/VCD_SECTOR_DATA);
+#else
+    vcd_set_msf(s->pos/VCD_SECTOR_DATA);
+#endif
+    break;
+  }
+//   putchar('.');fflush(stdout);
+//} else {
+//   putchar('%');fflush(stdout);
+}
+
+  stream_fill_buffer(s);
+  if(pos>=0 && pos<s->buf_len){
+    s->buf_pos=pos; // byte position in sector
+    return 1;
+  }
+  printf("stream_seek: WARNING! Can't seek to 0x%X !\n",pos+newpos);
+  return 0;
+}
+
+inline void stream_skip(stream_t *s,int len){
+  if(len<0 || len>2*STREAM_BUFFER_SIZE){
+    // negative or big skip!
+    stream_seek(s,stream_tell(s)+len);
+    return;
+  }
+  while(len>0){
+    int x=s->buf_len-s->buf_pos;
+    if(x==0){
+      if(!stream_fill_buffer(s)) return; // EOF
+      x=s->buf_len-s->buf_pos;
+    }
+    if(x>len) x=len;
+    //memcpy(mem,&s->buf[s->buf_pos],x);
+    s->buf_pos+=x; len-=x;
+  }
+}
+
+void stream_reset(stream_t *s){
+  if(s->eof){
+    s->pos=0; //ftell(f);
+//    s->buf_pos=s->buf_len=0;
+    s->eof=0;
+  }
+  //stream_seek(s,0);
+}
+
+stream_t* new_stream(int fd,int type){
+  stream_t *s=malloc(sizeof(stream_t));
+  s->fd=fd;
+  s->type=type;
+  stream_reset(s);
+  return s;
+}
+
+void free_stream(stream_t *s){
+  free(s);
+}
+
+
-- 
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