ao: do not allow actual buffer size of 0

You can use --audio-buffer=0 to minimize the audio buffer size. But if
the AO reports no device buffer size (like e.g. ao_jack does), then the
buffer size is actually 0, and playback can never work properly.

Make it fallback to a size of 1, which is unlikely to work properly, but
you get what you asked for, instead of a freeze.

1 files changed, 1 insertions, 0 deletions

diff --git a/audio/out/ao.c b/audio/out/ao.c
index 5834345d59..8f6fc8ea3c 100644
--- a/audio/out/ao.c
+++ b/audio/out/ao.c
@@ -232,6 +232,7 @@ static struct ao *ao_init(bool probing, struct mpv_global *global,
     if (ao->device_buffer)
         MP_VERBOSE(ao, "device buffer: %d samples.\n", ao->device_buffer);
     ao->buffer = MPMAX(ao->device_buffer, ao->def_buffer * ao->samplerate);
+    ao->buffer = MPMAX(ao->buffer, 1);
 
     int align = af_format_sample_alignment(ao->format);
     ao->buffer = (ao->buffer + align - 1) / align * align;