X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/4dadf1a26a3a9b619f7d91cbc435c7d9429d64d3..ba70caca3f9debf14c9f551ff4dcaddd1eb07d3d:/lib/alsabg.c

diff --git a/lib/alsabg.c b/lib/alsabg.c
index 61648f4..56e5c6a 100644
--- a/lib/alsabg.c
+++ b/lib/alsabg.c
@@ -2,30 +2,32 @@
  * This file is part of DisOrder.
  * Copyright (C) 2008 Richard Kettlewell
  *
- * This program is free software; you can redistribute it and/or modify
+ * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
  * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 /** @file alsabg.c
  * @brief Background-thread interface to ALSA
+ *
+ * This wraps ALSA with an interface which calls back to the client from a
+ * thread.  It's not intended for completely general use, just what DisOrder
+ * needs.
+ *
+ * Only builds on Linux systems.
  */
 
-#include <config.h>
+#include "common.h"
 
 #if HAVE_ALSA_ASOUNDLIB_H
-#include "types.h"
-
 #include <alsa/asoundlib.h>
 #include <pthread.h>
 
@@ -179,12 +181,14 @@ static void *alsa_bg_play(void attribute((unused)) *arg) {
     rframes = snd_pcm_writei(pcm, alsa_bg_buffer + start, nframes);
     ep(pthread_mutex_lock(&alsa_bg_lock));
     if(rframes < 0) {
-      error(0, "snd_pcm_writei: %d", rframes);
       switch(rframes) {
       case -EPIPE:
-        if((err = snd_pcm_recover(pcm, -EPIPE, 0)))
-          fatal(0, "snd_pcm_recover: %d", err);
+        error(0, "underrun detected");
+        if((err = snd_pcm_prepare(pcm)))
+          fatal(0, "snd_pcm_prepare: %d", err);
         break;
+      default:
+        fatal(0, "snd_pcm_writei: %d", rframes);
       }
     } else {
       const int rbytes = rframes * BYTES_PER_FRAME;
@@ -275,6 +279,10 @@ void alsa_bg_init(const char *device,
   ep(pthread_create(&alsa_bg_play_tid, 0, alsa_bg_play, 0));
 }
 
+/** @brief Deinitialize background ALSA playback
+ *
+ * The opposite of alsa_bg_init().
+ */
 void alsa_bg_close(void) {
   void *r;