coreaudio: Fix output stream format settings

Before commit 7d6948cd, it was coded to
retrieve the initial output stream format settings, modify the frame
rate, and set again. However, I removed a frame rate modification code by
mistake in the commit. It also assumes the initial output stream format
is consistent with what QEMU expects, but that expectation is not in the
code, which makes it harder to understand and will lead to breakage if
the initial settings change.

This change explicitly sets all of the output stream settings to solve
these problems.

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Message-Id: <20210616141721.54091-1-akihiko.odaki@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

audio/coreaudio.c

@@ -39,7 +39,6 @@ typedef struct coreaudioVoiceOut {
     int frameSizeSetting;
     uint32_t bufferCount;
     UInt32 audioDevicePropertyBufferFrameSize;
-    AudioStreamBasicDescription outputStreamBasicDescription;
     AudioDeviceIOProcID ioprocid;
     bool enabled;
 } coreaudioVoiceOut;
@@ -114,24 +113,6 @@ static OSStatus coreaudio_set_framesize(AudioDeviceID id, UInt32 *framesize)
                                       framesize);
 }
 
-static OSStatus coreaudio_get_streamformat(AudioDeviceID id,
-                                           AudioStreamBasicDescription *d)
-{
-    UInt32 size = sizeof(*d);
-    AudioObjectPropertyAddress addr = {
-        kAudioDevicePropertyStreamFormat,
-        kAudioDevicePropertyScopeOutput,
-        kAudioObjectPropertyElementMaster
-    };
-
-    return AudioObjectGetPropertyData(id,
-                                      &addr,
-                                      0,
-                                      NULL,
-                                      &size,
-                                      d);
-}
-
 static OSStatus coreaudio_set_streamformat(AudioDeviceID id,
                                            AudioStreamBasicDescription *d)
 {
@@ -373,6 +354,17 @@ static OSStatus init_out_device(coreaudioVoiceOut *core)
     OSStatus status;
     AudioValueRange frameRange;
 
+    AudioStreamBasicDescription streamBasicDescription = {
+        .mBitsPerChannel = core->hw.info.bits,
+        .mBytesPerFrame = core->hw.info.bytes_per_frame,
+        .mBytesPerPacket = core->hw.info.bytes_per_frame,
+        .mChannelsPerFrame = core->hw.info.nchannels,
+        .mFormatFlags = kLinearPCMFormatFlagIsFloat,
+        .mFormatID = kAudioFormatLinearPCM,
+        .mFramesPerPacket = 1,
+        .mSampleRate = core->hw.info.freq
+    };
+
     status = coreaudio_get_voice(&core->outputDeviceID);
     if (status != kAudioHardwareNoError) {
         coreaudio_playback_logerr (status,
@@ -432,29 +424,16 @@ static OSStatus init_out_device(coreaudioVoiceOut *core)
     }
     core->hw.samples = core->bufferCount * core->audioDevicePropertyBufferFrameSize;
 
-    /* get StreamFormat */
-    status = coreaudio_get_streamformat(core->outputDeviceID,
-                                        &core->outputStreamBasicDescription);
-    if (status == kAudioHardwareBadObjectError) {
-        return 0;
-    }
-    if (status != kAudioHardwareNoError) {
-        coreaudio_playback_logerr (status,
-                                    "Could not get Device Stream properties\n");
-        core->outputDeviceID = kAudioDeviceUnknown;
-        return status;
-    }
-
     /* set Samplerate */
     status = coreaudio_set_streamformat(core->outputDeviceID,
-                                        &core->outputStreamBasicDescription);
+                                        &streamBasicDescription);
     if (status == kAudioHardwareBadObjectError) {
         return 0;
     }
     if (status != kAudioHardwareNoError) {
         coreaudio_playback_logerr (status,
                                    "Could not set samplerate %lf\n",
-                                   core->outputStreamBasicDescription.mSampleRate);
+                                   streamBasicDescription.mSampleRate);
         core->outputDeviceID = kAudioDeviceUnknown;
         return status;
     }
@@ -598,7 +577,6 @@ static int coreaudio_init_out(HWVoiceOut *hw, struct audsettings *as,
         qapi_AudiodevCoreaudioPerDirectionOptions_base(cpdo), as, 11610);
 
     core->bufferCount = cpdo->has_buffer_count ? cpdo->buffer_count : 4;
-    core->outputStreamBasicDescription.mSampleRate = (Float64) as->freq;
 
     status = AudioObjectAddPropertyListener(kAudioObjectSystemObject,
                                             &voice_addr, handle_voice_change,