[MPlayer-dev-eng] [RFC] hack around desync on OSS pause

[Reimar Döffinger]

Hello,
what do you think about attached patch? It fixes the massive desync that
happens esp. when doing lots of frame stepping with -ao oss.
It is a bit hackish though, and in difference to alsa it will still loose some
sound during pause and not play any sound while framestepping.

Greetings,
Reimar Döffinger
-------------- next part --------------
Index: libao2/ao_oss.c
===================================================================
--- libao2/ao_oss.c	(revision 23155)
+++ libao2/ao_oss.c	(working copy)
@@ -147,6 +147,7 @@
 static char *dsp=PATH_DEV_DSP;
 static audio_buf_info zz;
 static int audio_fd=-1;
+static int prepause_space;
 
 static const char *oss_mixer_device = PATH_DEV_MIXER;
 static int oss_mixer_channel = SOUND_MIXER_PCM;
@@ -448,13 +449,21 @@
 // stop playing, keep buffers (for pause)
 static void audio_pause(void)
 {
+    prepause_space = get_space();
     uninit(1);
 }
 
 // resume playing, after audio_pause()
 static void audio_resume(void)
 {
+    int fillcnt;
     reset();
+    fillcnt = get_space() - prepause_space;
+    if (fillcnt > 0) {
+      void *silence = calloc(fillcnt, 1);
+      play(silence, fillcnt, 0);
+      free(silence);
+    }
 }