ao_coreaudio_utils: add function for ASBD -> mp format lookup

Useful with some of the following commits.

ca_fill_asbd() should behave exactly as before.

Instead of actually implementing the inverse function of ca_fill_asbd(),
just loop over the (small) list of mpv functions and check if any mpv
equivalent to a given ASBD exists.

1 files changed, 3 insertions, 0 deletions

diff --git a/audio/out/ao_coreaudio_utils.h b/audio/out/ao_coreaudio_utils.h
index bd233e4b22..b5f8e7f2ba 100644
--- a/audio/out/ao_coreaudio_utils.h
+++ b/audio/out/ao_coreaudio_utils.h
@@ -55,6 +55,9 @@ OSStatus ca_select_device(struct ao *ao, char* name, AudioDeviceID *device);
 void ca_fill_asbd(struct ao *ao, AudioStreamBasicDescription *asbd);
 void ca_print_asbd(struct ao *ao, const char *description,
                    const AudioStreamBasicDescription *asbd);
+bool ca_asbd_equals(const AudioStreamBasicDescription *a,
+                    const AudioStreamBasicDescription *b);
+int ca_asbd_to_mp_format(const AudioStreamBasicDescription *asbd);
 
 int64_t ca_frames_to_us(struct ao *ao, uint32_t frames);
 int64_t ca_get_latency(const AudioTimeStamp *ts);