mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 16:33:02 +00:00
19bcce624f
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@969 b3059339-0415-0410-9bf9-f77b7e298cf2
74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
|
|
// 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;
|
|
}
|
|
|