audio: make decoders output refcounted frames

This rewrites the audio decode loop to some degree. Audio filters don't
do refcounted frames yet, so af.c contains a hacky "emulation".

Remove some of the weird heuristic-heavy code in dec_audio.c. Instead of
estimating how much audio we need to filter, we always filter full
frames. Maybe this should be adjusted later: in case filtering increases
the volume of the audio data, we should try not to buffer too much
filter output by reducing the input that is fed at once.

For ad_spdif.c and ad_mpg123.c, we don't avoid extra copying yet - it
doesn't seem worth the trouble.

1 files changed, 3 insertions, 1 deletions

diff --git a/audio/filter/af.h b/audio/filter/af.h
index 5c7a6c0e7c..682cdb93e3 100644
--- a/audio/filter/af.h
+++ b/audio/filter/af.h
@@ -136,7 +136,9 @@ void af_uninit(struct af_stream *s);
 struct af_instance *af_add(struct af_stream *s, char *name, char **args);
 int af_remove_by_label(struct af_stream *s, char *label);
 struct af_instance *af_find_by_label(struct af_stream *s, char *label);
-int af_filter(struct af_stream *s, struct mp_audio *data, int flags);
+struct mp_audio_buffer;
+int af_filter(struct af_stream *s, struct mp_audio *data,
+              struct mp_audio_buffer *output);
 struct af_instance *af_control_any_rev(struct af_stream *s, int cmd, void *arg);
 void af_control_all(struct af_stream *s, int cmd, void *arg);