ao_pcm, core: use new API in ao_pcm, change timing with it

Change ao_pcm to use the new audio output driver API and clean up some
of the code. Rewrite the logic controlling how playback timing works
when using -ao pcm. Deprecate the "fast" suboption; its only effect
now is to print a warning, but it's still accepted so that specifying
it is not an error.

Before, timing with -ao pcm and video enabled had two possible
modes. In the default mode playback speed was rather arbitrary - not
realtime, but not particularly fast. -ao pcm:fast tried to play back
at maximum video playback speed - mostly succeeding, but not quite
guaranteed to work in all cases. Now the default is to play at
realtime speed. The -benchmark option can now be used to get faster
playback (same as the video-only case). In the audio-only case
playback is always maximum speed.

1 files changed, 10 insertions, 3 deletions

diff --git a/libao2/audio_out.c b/libao2/audio_out.c
index da471f0cc7..699ae7071b 100644
--- a/libao2/audio_out.c
+++ b/libao2/audio_out.c
@@ -236,6 +236,10 @@ int ao_control(struct ao *ao, int cmd, void *arg)
 
 double ao_get_delay(struct ao *ao)
 {
+    if (!ao->driver->get_delay) {
+        assert(ao->untimed);
+        return 0;
+    }
     return ao->driver->get_delay(ao);
 }
 
@@ -246,17 +250,20 @@ int ao_get_space(struct ao *ao)
 
 void ao_reset(struct ao *ao)
 {
-    ao->driver->reset(ao);
+    if (ao->driver->reset)
+        ao->driver->reset(ao);
 }
 
 void ao_pause(struct ao *ao)
 {
-    ao->driver->pause(ao);
+    if (ao->driver->pause)
+        ao->driver->pause(ao);
 }
 
 void ao_resume(struct ao *ao)
 {
-    ao->driver->resume(ao);
+    if (ao->driver->resume)
+        ao->driver->resume(ao);
 }