From 19bcce624f2199d9acbc5be3b8835497609e9b98 Mon Sep 17 00:00:00 2001
From: arpi_esp <arpi_esp@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sun, 3 Jun 2001 19:09:17 +0000
Subject: ring buffering example

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@969 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 TOOLS/buffer.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 TOOLS/buffer.c

(limited to 'TOOLS')

diff --git a/TOOLS/buffer.c b/TOOLS/buffer.c
new file mode 100644
index 0000000000..bc568902a7
--- /dev/null
+++ b/TOOLS/buffer.c
@@ -0,0 +1,73 @@
+
+// General purpose Ring-buffering routines
+
+#define BUFFSIZE (1024)
+#define NUM_BUFS (64)
+
+static unsigned char *buffer[NUM_BUFS];
+
+static unsigned int buf_read=0;
+static unsigned int buf_write=0;
+static unsigned int buf_read_pos=0;
+static unsigned int buf_write_pos=0;
+
+static int full_buffers=0;
+static int buffered_bytes=0;
+
+static int write_buffer(unsigned char* data,int len){
+  int len2=0;
+  int x;
+  while(len>0){
+    if(full_buffers==NUM_BUFS) break;
+    x=BUFFSIZE-buf_write_pos;
+    if(x>len) x=len;
+    memcpy(buffer[buf_write]+buf_write_pos,data+len2,x);
+    len2+=x; len-=x;
+    buffered_bytes+=x; buf_write_pos+=x;
+    if(buf_write_pos>=BUFFSIZE){
+       // block is full, find next!
+       buf_write=(buf_write+1)%NUM_BUFS;
+       ++full_buffers;
+       buf_write_pos=0;
+    }
+  }
+  return len2;
+}
+
+static int read_buffer(unsigned char* data,int len){
+  int len2=0;
+  int x;
+  while(len>0){
+    if(full_buffers==0) break; // no more data buffered!
+    x=BUFFSIZE-buf_read_pos;
+    if(x>len) x=len;
+    memcpy(data+len2,buffer[buf_read]+buf_read_pos,x);
+    len2+=x; len-=x;
+    buffered_bytes-=x; buf_read_pos+=x;
+    if(buf_read_pos>=BUFFSIZE){
+       // block is empty, find next!
+       buf_read=(buf_read+1)%NUM_BUFS;
+       --full_buffers;
+       buf_read_pos=0;
+    }
+  }
+  return len2;
+}
+
+static int get_space(){
+    return (NUM_BUFS-full_buffers)*BUFFSIZE - buf_write_pos;
+}
+
+static int get_delay(){
+    return buffered_bytes;
+}
+
+int main(int argc,char* argv[]){
+
+	   int i;
+	   
+	   for(i=0;i<NUM_BUFS;i++) buffer[i]=malloc(BUFFSIZE);
+
+return 0;
+}
+
-- 
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