ao_coreaudio: set kAudioOutputUnitProperty_ChannelMap

This fixes #15584

audio/out/ao_avfoundation.m

@@ -277,22 +277,8 @@ static int init(struct ao *ao)
 
     AudioStreamBasicDescription asbd;
     ca_fill_asbd(ao, &asbd);
-    size_t layout_size = sizeof(AudioChannelLayout)
-                         + (ao->channels.num - 1) * sizeof(AudioChannelDescription);
-    layout = talloc_size(ao, layout_size);
-    layout->mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
-    layout->mNumberChannelDescriptions = ao->channels.num;
-    for (int i = 0; i < ao->channels.num; ++i) {
-        AudioChannelDescription *desc = layout->mChannelDescriptions + i;
-        desc->mChannelFlags = kAudioChannelFlags_AllOff;
-        desc->mChannelLabel = mp_speaker_id_to_ca_label(ao->channels.speaker[i]);
-    }
-
-    void *talloc_ctx = talloc_new(NULL);
-    AudioChannelLayout *std_layout = ca_find_standard_layout(talloc_ctx, layout);
-    memmove(layout, std_layout, sizeof(AudioChannelLayout));
-    talloc_free(talloc_ctx);
-    ca_log_layout(ao, MSGL_V, layout);
+    size_t layout_size;
+    layout = ca_get_acl(ao, &layout_size);
 
     OSStatus err;
     if ((err = CMAudioFormatDescriptionCreate(

audio/out/ao_coreaudio.c

@@ -136,7 +136,7 @@ static int control(struct ao *ao, enum aocontrol cmd, void *arg)
     return CONTROL_UNKNOWN;
 }
 
-static bool init_audiounit(struct ao *ao, AudioStreamBasicDescription asbd);
+static bool init_audiounit(struct ao *ao, AudioStreamBasicDescription asbd, AudioChannelLayout *layout, size_t layout_size);
 static void init_physical_format(struct ao *ao);
 static void reinit_latency(struct ao *ao);
 static bool register_hotplug_cb(struct ao *ao);
@@ -178,8 +178,13 @@ static int init(struct ao *ao)
 
     AudioStreamBasicDescription asbd;
     ca_fill_asbd(ao, &asbd);
+    size_t layout_size;
+    AudioChannelLayout *layout = ca_get_acl(ao, &layout_size);
 
-    if (!init_audiounit(ao, asbd))
+    bool r = init_audiounit(ao, asbd, layout, layout_size);
+    talloc_free(layout);
+
+    if (!r)
         goto coreaudio_error;
 
     reinit_latency(ao);
@@ -273,7 +278,7 @@ coreaudio_error:
     return;
 }
 
-static bool init_audiounit(struct ao *ao, AudioStreamBasicDescription asbd)
+static bool init_audiounit(struct ao *ao, AudioStreamBasicDescription asbd, AudioChannelLayout *layout, size_t layout_size)
 {
     OSStatus err;
     uint32_t size;
@@ -317,6 +322,13 @@ static bool init_audiounit(struct ao *ao, AudioStreamBasicDescription asbd)
     CHECK_CA_ERROR_L(coreaudio_error_audiounit,
                      "can't link audio unit to selected device");
 
+    err = AudioUnitSetProperty(p->audio_unit,
+                               kAudioOutputUnitProperty_ChannelMap,
+                               kAudioUnitScope_Global, 0, layout, layout_size);
+
+    CHECK_CA_ERROR_L(coreaudio_error_audiounit,
+                     "unable to set the input channel layout on the audio unit");
+
     AURenderCallbackStruct render_cb = (AURenderCallbackStruct) {
         .inputProc       = render_cb_lpcm,
         .inputProcRefCon = ao,

audio/out/ao_coreaudio_chmap.c

@@ -314,6 +314,30 @@ mismatch:;
     return s ? s : l;
 }
 
+AudioChannelLayout *ca_get_acl(struct ao *ao, size_t *out_layout_size)
+{
+    size_t layout_size = sizeof(AudioChannelLayout)
+                         + (ao->channels.num - 1) * sizeof(AudioChannelDescription);
+    AudioChannelLayout *layout = talloc_size(ao, layout_size);
+    layout->mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
+    layout->mNumberChannelDescriptions = ao->channels.num;
+    for (int i = 0; i < ao->channels.num; ++i) {
+        AudioChannelDescription *desc = layout->mChannelDescriptions + i;
+        desc->mChannelFlags = kAudioChannelFlags_AllOff;
+        desc->mChannelLabel = mp_speaker_id_to_ca_label(ao->channels.speaker[i]);
+    }
+
+    void *talloc_ctx = talloc_new(NULL);
+    AudioChannelLayout *std_layout = ca_find_standard_layout(talloc_ctx, layout);
+    memmove(layout, std_layout, sizeof(AudioChannelLayout));
+    talloc_free(talloc_ctx);
+    ca_log_layout(ao, MSGL_V, layout);
+
+    if (out_layout_size)
+        *out_layout_size = layout_size;
+    return layout;
+}
+
 
 #define CHMAP(n, ...) &(struct mp_chmap) MP_CONCAT(MP_CHMAP, n) (__VA_ARGS__)
 

audio/out/ao_coreaudio_chmap.h

@@ -28,6 +28,7 @@ AudioChannelLabel mp_speaker_id_to_ca_label(int speaker_id);
 
 #if HAVE_COREAUDIO || HAVE_AVFOUNDATION
 AudioChannelLayout *ca_find_standard_layout(void *talloc_ctx, AudioChannelLayout *l);
+AudioChannelLayout *ca_get_acl(struct ao *ao, size_t *out_layout_size);
 void ca_log_layout(struct ao *ao, int l, AudioChannelLayout *layout);
 bool ca_init_chmap(struct ao *ao, AudioDeviceID device);
 void ca_get_active_chmap(struct ao *ao, AudioDeviceID device, int channel_count,