new audio block/select test

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@687 b3059339-0415-0410-9bf9-f77b7e298cf2

TOOLS/audio-block2.c

@@ -0,0 +1,74 @@
+// This small util discovers your audio driver's behaviour
+
+#define OUTBURST 512
+//#define OUTBURST 4096
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/soundcard.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+                     
+
+// Returns current time in microseconds
+unsigned int GetTimer(){
+  struct timeval tv;
+  struct timezone tz;
+//  float s;
+  gettimeofday(&tv,&tz);
+//  s=tv.tv_usec;s*=0.000001;s+=tv.tv_sec;
+  return (tv.tv_sec*1000000+tv.tv_usec);
+}  
+
+static unsigned char a_buffer[OUTBURST];
+
+int main(){
+  int audio_buffer_size=0;
+  int r;
+  int xxx=1024*2;
+  int audio_fd;
+  char *dsp="/dev/dsp";
+  unsigned int t0,t1,t2;
+
+  audio_fd=open(dsp, O_WRONLY);
+  if(audio_fd<0){
+    printf("Can't open audio device %s\n",dsp);
+    return 1;
+  }
+  
+  r=AFMT_S16_LE;ioctl (audio_fd, SNDCTL_DSP_SETFMT, &r);
+  r=1; ioctl (audio_fd, SNDCTL_DSP_STEREO, &r);
+  r=44100; if(ioctl (audio_fd, SNDCTL_DSP_SPEED, &r)==-1)
+      printf("audio_setup: your card doesn't support %d Hz samplerate\n",r);
+
+  t0=t1=GetTimer();
+
+while(xxx-->0){
+      char c='B';
+      fd_set rfds;
+      struct timeval tv;
+      FD_ZERO(&rfds); FD_SET(audio_fd,&rfds);
+      tv.tv_sec=0; tv.tv_usec = 0;
+      if(select(audio_fd+1, NULL, &rfds, NULL, &tv)) c=' ';
+
+    r=write(audio_fd,a_buffer,OUTBURST);
+    t2=GetTimer();
+    if(r<0) printf("Error writting to device\n"); else
+    if(r==0) printf("EOF writting to device???\n"); else {
+      printf("%c %6.3f %6.3f  [%6d] writting %3d of %3d bytes in %7d us\n",c,
+        (float)audio_buffer_size/(44100.0f*4.0f),(float)(t1-t0)*0.000001f,
+        audio_buffer_size,r,OUTBURST,t2-t1);
+      audio_buffer_size+=r;
+    }
+    t1=t2;
+}
+
+close(audio_fd);
+
+return 0;
+}
+