ao_coreaudio: move spdif code to a new AO

The mplayer1/2/mpv CoreAudio audio output historically contained both usage
of AUHAL APIs (these go through the CoreAudio audio server) and the Device
based APIs (used only for output of compressed formats in exclusive mode).

The latter is a very unwieldy and low level API and pretty much forces us to
write a lot of code for little workr. Also with the widespread of HDMI, the
actual need for outputting compressed audio directly to the device is getting
lower (it was very useful with S/PDIF for bandwidth constraints not allowing
a number if channels transmitted in LPCM).

Considering how invasive it is (uses hog/exclusive mode), the new AO
(`ao_coreaudio_device`) is not going to be autoprobed but the user will have
to select it.

1 files changed, 3 insertions, 0 deletions

diff --git a/audio/out/ao_coreaudio_utils.h b/audio/out/ao_coreaudio_utils.h
index 9218ccf00d..f44ea28e82 100644
--- a/audio/out/ao_coreaudio_utils.h
+++ b/audio/out/ao_coreaudio_utils.h
@@ -46,6 +46,9 @@ bool check_ca_st(struct ao *ao, int level, OSStatus code, const char *message);
         if (err != noErr) goto label; \
     } while (0)
 
+void ca_print_device_list(struct ao *ao);
+OSStatus ca_select_device(struct ao *ao, int selection, AudioDeviceID *device);
+
 void ca_print_asbd(struct ao *ao, const char *description,
                    const AudioStreamBasicDescription *asbd);