1 files changed, 437 insertions, 0 deletions
diff --git a/src/output/OSXOutputPlugin.cxx b/src/output/OSXOutputPlugin.cxx
new file mode 100644
index 00000000..5a04fe1d
--- /dev/null
+++ b/src/output/OSXOutputPlugin.cxx
@@ -0,0 +1,437 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "OSXOutputPlugin.hxx"
+#include "output_api.h"
+#include "util/fifo_buffer.h"
+#include "thread/Mutex.hxx"
+#include "thread/Cond.hxx"
+
+#include <glib.h>
+#include <CoreAudio/AudioHardware.h>
+#include <AudioUnit/AudioUnit.h>
+#include <CoreServices/CoreServices.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "osx"
+
+struct OSXOutput {
+	struct audio_output base;
+
+	/* configuration settings */
+	OSType component_subtype;
+	/* only applicable with kAudioUnitSubType_HALOutput */
+	const char *device_name;
+
+	AudioUnit au;
+	Mutex mutex;
+	Cond condition;
+
+	struct fifo_buffer *buffer;
+};
+
+/**
+ * The quark used for GError.domain.
+ */
+static inline GQuark
+osx_output_quark(void)
+{
+	return g_quark_from_static_string("osx_output");
+}
+
+static bool
+osx_output_test_default_device(void)
+{
+	/* on a Mac, this is always the default plugin, if nothing
+	   else is configured */
+	return true;
+}
+
+static void
+osx_output_configure(OSXOutput *oo, const struct config_param *param)
+{
+	const char *device = config_get_block_string(param, "device", NULL);
+
+	if (device == NULL || 0 == strcmp(device, "default")) {
+		oo->component_subtype = kAudioUnitSubType_DefaultOutput;
+		oo->device_name = NULL;
+	}
+	else if (0 == strcmp(device, "system")) {
+		oo->component_subtype = kAudioUnitSubType_SystemOutput;
+		oo->device_name = NULL;
+	}
+	else {
+		oo->component_subtype = kAudioUnitSubType_HALOutput;
+		/* XXX am I supposed to g_strdup() this? */
+		oo->device_name = device;
+	}
+}
+
+static struct audio_output *
+osx_output_init(const struct config_param *param, GError **error_r)
+{
+	OSXOutput *oo = new OSXOutput();
+	if (!ao_base_init(&oo->base, &osx_output_plugin, param, error_r)) {
+		delete oo;
+		return NULL;
+	}
+
+	osx_output_configure(oo, param);
+
+	return &oo->base;
+}
+
+static void
+osx_output_finish(struct audio_output *ao)
+{
+	OSXOutput *oo = (OSXOutput *)ao;
+
+	delete oo;
+}
+
+static bool
+osx_output_set_device(OSXOutput *oo, GError **error)
+{
+	bool ret = true;
+	OSStatus status;
+	UInt32 size, numdevices;
+	AudioDeviceID *deviceids = NULL;
+	char name[256];
+	unsigned int i;
+
+	if (oo->component_subtype != kAudioUnitSubType_HALOutput)
+		goto done;
+
+	/* how many audio devices are there? */
+	status = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices,
+					      &size,
+					      NULL);
+	if (status != noErr) {
+		g_set_error(error, osx_output_quark(), status,
+			    "Unable to determine number of OS X audio devices: %s",
+			    GetMacOSStatusCommentString(status));
+		ret = false;
+		goto done;
+	}
+
+	/* what are the available audio device IDs? */
+	numdevices = size / sizeof(AudioDeviceID);
+	deviceids = new AudioDeviceID[numdevices];
+	status = AudioHardwareGetProperty(kAudioHardwarePropertyDevices,
+					  &size,
+					  deviceids);
+	if (status != noErr) {
+		g_set_error(error, osx_output_quark(), status,
+			    "Unable to determine OS X audio device IDs: %s",
+			    GetMacOSStatusCommentString(status));
+		ret = false;
+		goto done;
+	}
+
+	/* which audio device matches oo->device_name? */
+	for (i = 0; i < numdevices; i++) {
+		size = sizeof(name);
+		status = AudioDeviceGetProperty(deviceids[i], 0, false,
+						kAudioDevicePropertyDeviceName,
+						&size, name);
+		if (status != noErr) {
+			g_set_error(error, osx_output_quark(), status,
+				    "Unable to determine OS X device name "
+				    "(device %u): %s",
+				    (unsigned int) deviceids[i],
+				    GetMacOSStatusCommentString(status));
+			ret = false;
+			goto done;
+		}
+		if (strcmp(oo->device_name, name) == 0) {
+			g_debug("found matching device: ID=%u, name=%s",
+				(unsigned int) deviceids[i], name);
+			break;
+		}
+	}
+	if (i == numdevices) {
+		g_warning("Found no audio device with name '%s' "
+			  "(will use default audio device)",
+			  oo->device_name);
+		goto done;
+	}
+
+	status = AudioUnitSetProperty(oo->au,
+				      kAudioOutputUnitProperty_CurrentDevice,
+				      kAudioUnitScope_Global,
+				      0,
+				      &(deviceids[i]),
+				      sizeof(AudioDeviceID));
+	if (status != noErr) {
+		g_set_error(error, osx_output_quark(), status,
+			    "Unable to set OS X audio output device: %s",
+			    GetMacOSStatusCommentString(status));
+		ret = false;
+		goto done;
+	}
+	g_debug("set OS X audio output device ID=%u, name=%s",
+		(unsigned int) deviceids[i], name);
+
+done:
+	delete[] deviceids;
+	return ret;
+}
+
+static OSStatus
+osx_render(void *vdata,
+	   G_GNUC_UNUSED AudioUnitRenderActionFlags *io_action_flags,
+	   G_GNUC_UNUSED const AudioTimeStamp *in_timestamp,
+	   G_GNUC_UNUSED UInt32 in_bus_number,
+	   G_GNUC_UNUSED UInt32 in_number_frames,
+	   AudioBufferList *buffer_list)
+{
+	OSXOutput *od = (OSXOutput *) vdata;
+	AudioBuffer *buffer = &buffer_list->mBuffers[0];
+	size_t buffer_size = buffer->mDataByteSize;
+
+	assert(od->buffer != NULL);
+
+	od->mutex.lock();
+
+	size_t nbytes;
+	const void *src = fifo_buffer_read(od->buffer, &nbytes);
+
+	if (src != NULL) {
+		if (nbytes > buffer_size)
+			nbytes = buffer_size;
+
+		memcpy(buffer->mData, src, nbytes);
+		fifo_buffer_consume(od->buffer, nbytes);
+	} else
+		nbytes = 0;
+
+	od->condition.signal();
+	od->mutex.unlock();
+
+	buffer->mDataByteSize = nbytes;
+
+	unsigned i;
+	for (i = 1; i < buffer_list->mNumberBuffers; ++i) {
+		buffer = &buffer_list->mBuffers[i];
+		buffer->mDataByteSize = 0;
+	}
+
+	return 0;
+}
+
+static bool
+osx_output_enable(struct audio_output *ao, GError **error_r)
+{
+	OSXOutput *oo = (OSXOutput *)ao;
+
+	ComponentDescription desc;
+	desc.componentType = kAudioUnitType_Output;
+	desc.componentSubType = oo->component_subtype;
+	desc.componentManufacturer = kAudioUnitManufacturer_Apple;
+	desc.componentFlags = 0;
+	desc.componentFlagsMask = 0;
+
+	Component comp = FindNextComponent(NULL, &desc);
+	if (comp == 0) {
+		g_set_error(error_r, osx_output_quark(), 0,
+			    "Error finding OS X component");
+		return false;
+	}
+
+	OSStatus status = OpenAComponent(comp, &oo->au);
+	if (status != noErr) {
+		g_set_error(error_r, osx_output_quark(), status,
+			    "Unable to open OS X component: %s",
+			    GetMacOSStatusCommentString(status));
+		return false;
+	}
+
+	if (!osx_output_set_device(oo, error_r)) {
+		CloseComponent(oo->au);
+		return false;
+	}
+
+	AURenderCallbackStruct callback;
+	callback.inputProc = osx_render;
+	callback.inputProcRefCon = oo;
+
+	ComponentResult result =
+		AudioUnitSetProperty(oo->au,
+				     kAudioUnitProperty_SetRenderCallback,
+				     kAudioUnitScope_Input, 0,
+				     &callback, sizeof(callback));
+	if (result != noErr) {
+		CloseComponent(oo->au);
+		g_set_error(error_r, osx_output_quark(), result,
+			    "unable to set callback for OS X audio unit");
+		return false;
+	}
+
+	return true;
+}
+
+static void
+osx_output_disable(struct audio_output *ao)
+{
+	OSXOutput *oo = (OSXOutput *)ao;
+
+	CloseComponent(oo->au);
+}
+
+static void
+osx_output_cancel(struct audio_output *ao)
+{
+	OSXOutput *od = (OSXOutput *)ao;
+
+	const ScopeLock protect(od->mutex);
+	fifo_buffer_clear(od->buffer);
+}
+
+static void
+osx_output_close(struct audio_output *ao)
+{
+	OSXOutput *od = (OSXOutput *)ao;
+
+	AudioOutputUnitStop(od->au);
+	AudioUnitUninitialize(od->au);
+
+	fifo_buffer_free(od->buffer);
+}
+
+static bool
+osx_output_open(struct audio_output *ao, struct audio_format *audio_format, GError **error)
+{
+	OSXOutput *od = (OSXOutput *)ao;
+
+	AudioStreamBasicDescription stream_description;
+	stream_description.mSampleRate = audio_format->sample_rate;
+	stream_description.mFormatID = kAudioFormatLinearPCM;
+	stream_description.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger;
+
+	switch (audio_format->format) {
+	case SAMPLE_FORMAT_S8:
+		stream_description.mBitsPerChannel = 8;
+		break;
+
+	case SAMPLE_FORMAT_S16:
+		stream_description.mBitsPerChannel = 16;
+		break;
+
+	case SAMPLE_FORMAT_S32:
+		stream_description.mBitsPerChannel = 32;
+		break;
+
+	default:
+		audio_format->format = SAMPLE_FORMAT_S32;
+		stream_description.mBitsPerChannel = 32;
+		break;
+	}
+
+#if G_BYTE_ORDER == G_BIG_ENDIAN
+	stream_description.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
+#endif
+
+	stream_description.mBytesPerPacket =
+		audio_format_frame_size(audio_format);
+	stream_description.mFramesPerPacket = 1;
+	stream_description.mBytesPerFrame = stream_description.mBytesPerPacket;
+	stream_description.mChannelsPerFrame = audio_format->channels;
+
+	ComponentResult result =
+		AudioUnitSetProperty(od->au, kAudioUnitProperty_StreamFormat,
+				     kAudioUnitScope_Input, 0,
+				     &stream_description,
+				     sizeof(stream_description));
+	if (result != noErr) {
+		g_set_error(error, osx_output_quark(), result,
+			    "Unable to set format on OS X device");
+		return false;
+	}
+
+	OSStatus status = AudioUnitInitialize(od->au);
+	if (status != noErr) {
+		g_set_error(error, osx_output_quark(), status,
+			    "Unable to initialize OS X audio unit: %s",
+			    GetMacOSStatusCommentString(status));
+		return false;
+	}
+
+	/* create a buffer of 1s */
+	od->buffer = fifo_buffer_new(audio_format->sample_rate *
+				     audio_format_frame_size(audio_format));
+
+	status = AudioOutputUnitStart(od->au);
+	if (status != 0) {
+		AudioUnitUninitialize(od->au);
+		g_set_error(error, osx_output_quark(), status,
+			    "unable to start audio output: %s",
+			    GetMacOSStatusCommentString(status));
+		return false;
+	}
+
+	return true;
+}
+
+static size_t
+osx_output_play(struct audio_output *ao, const void *chunk, size_t size,
+		G_GNUC_UNUSED GError **error)
+{
+	OSXOutput *od = (OSXOutput *)ao;
+
+	const ScopeLock protect(od->mutex);
+
+	void *dest;
+	size_t max_length;
+
+	while (true) {
+		dest = fifo_buffer_write(od->buffer, &max_length);
+		if (dest != NULL)
+			break;
+
+		/* wait for some free space in the buffer */
+		od->condition.wait(od->mutex);
+	}
+
+	if (size > max_length)
+		size = max_length;
+
+	memcpy(dest, chunk, size);
+	fifo_buffer_append(od->buffer, size);
+
+	return size;
+}
+
+const struct audio_output_plugin osx_output_plugin = {
+	"osx",
+	osx_output_test_default_device,
+	osx_output_init,
+	osx_output_finish,
+	osx_output_enable,
+	osx_output_disable,
+	osx_output_open,
+	osx_output_close,
+	nullptr,
+	nullptr,
+	osx_output_play,
+	nullptr,
+	osx_output_cancel,
+	nullptr,
+	nullptr,
+};