static int coreaudio_init_out (HWVoiceOut *hw, audsettings_t *as) { OSStatus status; coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw; UInt32 propertySize; int err; const char *typ = "playback"; AudioValueRange frameRange; /* create mutex */ err = pthread_mutex_init(&core->mutex, NULL); if (err) { dolog("Could not create mutex\nReason: %s\n", strerror (err)); return -1; } audio_pcm_init_info (&hw->info, as); /* open default output device */ propertySize = sizeof(core->outputDeviceID); status = AudioHardwareGetProperty( kAudioHardwarePropertyDefaultOutputDevice, &propertySize, &core->outputDeviceID); if (status != kAudioHardwareNoError) { coreaudio_logerr2 (status, typ, "Could not get default output Device\n"); return -1; } if (core->outputDeviceID == kAudioDeviceUnknown) { dolog ("Could not initialize %s - Unknown Audiodevice\n", typ); return -1; } /* get minimum and maximum buffer frame sizes */ propertySize = sizeof(frameRange); status = AudioDeviceGetProperty( core->outputDeviceID, 0, 0, kAudioDevicePropertyBufferFrameSizeRange, &propertySize, &frameRange); if (status != kAudioHardwareNoError) { coreaudio_logerr2 (status, typ, "Could not get device buffer frame range\n"); return -1; } if (frameRange.mMinimum > conf.buffer_frames) { core->audioDevicePropertyBufferFrameSize = (UInt32) frameRange.mMinimum; dolog ("warning: Upsizing Buffer Frames to %f\n", frameRange.mMinimum); } else if (frameRange.mMaximum < conf.buffer_frames) { core->audioDevicePropertyBufferFrameSize = (UInt32) frameRange.mMaximum; dolog ("warning: Downsizing Buffer Frames to %f\n", frameRange.mMaximum); } else { core->audioDevicePropertyBufferFrameSize = conf.buffer_frames; } /* set Buffer Frame Size */ propertySize = sizeof(core->audioDevicePropertyBufferFrameSize); status = AudioDeviceSetProperty( core->outputDeviceID, NULL, 0, false, kAudioDevicePropertyBufferFrameSize, propertySize, &core->audioDevicePropertyBufferFrameSize); if (status != kAudioHardwareNoError) { coreaudio_logerr2 (status, typ, "Could not set device buffer frame size %ld\n", core->audioDevicePropertyBufferFrameSize); return -1; } /* get Buffer Frame Size */ propertySize = sizeof(core->audioDevicePropertyBufferFrameSize); status = AudioDeviceGetProperty( core->outputDeviceID, 0, false, kAudioDevicePropertyBufferFrameSize, &propertySize, &core->audioDevicePropertyBufferFrameSize); if (status != kAudioHardwareNoError) { coreaudio_logerr2 (status, typ, "Could not get device buffer frame size\n"); return -1; } hw->samples = conf.nbuffers * core->audioDevicePropertyBufferFrameSize; /* get StreamFormat */ propertySize = sizeof(core->outputStreamBasicDescription); status = AudioDeviceGetProperty( core->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormat, &propertySize, &core->outputStreamBasicDescription); if (status != kAudioHardwareNoError) { coreaudio_logerr2 (status, typ, "Could not get Device Stream properties\n"); core->outputDeviceID = kAudioDeviceUnknown; return -1; } /* set Samplerate */ core->outputStreamBasicDescription.mSampleRate = (Float64) as->freq; propertySize = sizeof(core->outputStreamBasicDescription); status = AudioDeviceSetProperty( core->outputDeviceID, 0, 0, 0, kAudioDevicePropertyStreamFormat, propertySize, &core->outputStreamBasicDescription); if (status != kAudioHardwareNoError) { coreaudio_logerr2 (status, typ, "Could not set samplerate %d\n", as->freq); core->outputDeviceID = kAudioDeviceUnknown; return -1; } /* set Callback */ status = AudioDeviceAddIOProc(core->outputDeviceID, audioDeviceIOProc, hw); if (status != kAudioHardwareNoError) { coreaudio_logerr2 (status, typ, "Could not set IOProc\n"); core->outputDeviceID = kAudioDeviceUnknown; return -1; } /* start Playback */ if (!isPlaying(core->outputDeviceID)) { status = AudioDeviceStart(core->outputDeviceID, audioDeviceIOProc); if (status != kAudioHardwareNoError) { coreaudio_logerr2 (status, typ, "Could not start playback\n"); AudioDeviceRemoveIOProc(core->outputDeviceID, audioDeviceIOProc); core->outputDeviceID = kAudioDeviceUnknown; return -1; } } return 0; }