[mythtv] [Patch] Fix for choppy audio using ALSA

[Billy Macdonald]

Hi,
    This fixed the choppy audio I was getting using ALSA on my nforce2 
chipset.  Fixed the choppy audio for Analog and SPDIF.

Billy
-------------- next part --------------
? mypatch.diff
Index: audiooutputalsa.cpp
===================================================================
RCS file: /var/lib/mythcvs/mythtv/libs/libmyth/audiooutputalsa.cpp,v
retrieving revision 1.2
diff -u -w -r1.2 audiooutputalsa.cpp
--- audiooutputalsa.cpp	17 Jun 2003 00:51:23 -0000	1.2
+++ audiooutputalsa.cpp	26 Dec 2003 05:14:26 -0000
@@ -229,10 +229,14 @@
         return;
     
 //    printf("Trying to write %d i frames to soundbuffer\n", frames);
+    while (frames > 0) {
     err = snd_pcm_mmap_writei(pcm_handle, buffer, frames);
-    if (err == -EAGAIN || (err >= 0 && err != frames))
-        printf("Audio buffer overflow, audio data lost!\n");
-    else if (err < 0) {
+        if (err >= 0) {
+            buffer += err * audio_bytes_per_sample;
+            frames -= err;
+        } else if (err == -EAGAIN) {
+            snd_pcm_wait(pcm_handle, 10);
+	} else if (err < 0) {
         if (xrun_recovery(pcm_handle, err) < 0) {
             printf("Write error: %s\n", snd_strerror(err));
             printf("Disabling sound output.\n");
@@ -241,6 +245,7 @@
         }
         goto retry;
     }
+    }
     
     if(timecode < 0) 
         timecode = audbuf_timecode; // add to current timecode