Initial commit

backends/platform/ios7/ios7_osys_sound.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+// Disable symbol overrides so that we can use system headers.
+#define FORBIDDEN_SYMBOL_ALLOW_ALL
+
+#include "backends/platform/ios7/ios7_osys_main.h"
+
+void OSystem_iOS7::AQBufferCallback(void *in, AudioQueueRef inQ, AudioQueueBufferRef outQB) {
+	//printf("AQBufferCallback()\n");
+	if (s_AudioQueue.frameCount > 0 && s_soundCallback != NULL) {
+		outQB->mAudioDataByteSize = 4 * s_AudioQueue.frameCount;
+		s_soundCallback(s_soundParam, (byte *)outQB->mAudioData, outQB->mAudioDataByteSize);
+		AudioQueueEnqueueBuffer(inQ, outQB, 0, NULL);
+	} else {
+		AudioQueueStop(s_AudioQueue.queue, false);
+	}
+}
+
+void OSystem_iOS7::mixCallback(void *sys, byte *samples, int len) {
+	OSystem_iOS7 *this_ = (OSystem_iOS7 *)sys;
+	assert(this_);
+
+	if (this_->_mixer) {
+		this_->_mixer->mixCallback(samples, len);
+	}
+}
+
+void OSystem_iOS7::setupMixer() {
+	_mixer = new Audio::MixerImpl(AUDIO_SAMPLE_RATE, true, WAVE_BUFFER_SIZE);
+
+	s_soundCallback = mixCallback;
+	s_soundParam = this;
+
+	startSoundsystem();
+}
+
+void OSystem_iOS7::startSoundsystem() {
+	s_AudioQueue.dataFormat.mSampleRate = AUDIO_SAMPLE_RATE;
+	s_AudioQueue.dataFormat.mFormatID = kAudioFormatLinearPCM;
+	s_AudioQueue.dataFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
+	s_AudioQueue.dataFormat.mBytesPerPacket = 4;
+	s_AudioQueue.dataFormat.mFramesPerPacket = 1;
+	s_AudioQueue.dataFormat.mBytesPerFrame = 4;
+	s_AudioQueue.dataFormat.mChannelsPerFrame = 2;
+	s_AudioQueue.dataFormat.mBitsPerChannel = 16;
+	s_AudioQueue.frameCount = WAVE_BUFFER_SIZE;
+
+	if (AudioQueueNewOutput(&s_AudioQueue.dataFormat, AQBufferCallback, &s_AudioQueue, 0, kCFRunLoopCommonModes, 0, &s_AudioQueue.queue)) {
+		printf("Couldn't set the AudioQueue callback!\n");
+		_mixer->setReady(false);
+		return;
+	}
+
+	uint32 bufferBytes = s_AudioQueue.frameCount * s_AudioQueue.dataFormat.mBytesPerFrame;
+
+	for (int i = 0; i < AUDIO_BUFFERS; i++) {
+		if (AudioQueueAllocateBuffer(s_AudioQueue.queue, bufferBytes, &s_AudioQueue.buffers[i])) {
+			printf("Error allocating AudioQueue buffer!\n");
+			_mixer->setReady(false);
+			return;
+		}
+
+		AQBufferCallback(&s_AudioQueue, s_AudioQueue.queue, s_AudioQueue.buffers[i]);
+	}
+
+	AudioQueueSetParameter(s_AudioQueue.queue, kAudioQueueParam_Volume, 1.0);
+	if (AudioQueueStart(s_AudioQueue.queue, NULL)) {
+		printf("Error starting the AudioQueue!\n");
+		_mixer->setReady(false);
+		return;
+	}
+
+	_mixer->setReady(true);
+}
+
+void OSystem_iOS7::stopSoundsystem() {
+	AudioQueueStop(s_AudioQueue.queue, true);
+
+	for (int i = 0; i < AUDIO_BUFFERS; i++) {
+		AudioQueueFreeBuffer(s_AudioQueue.queue, s_AudioQueue.buffers[i]);
+	}
+
+	AudioQueueDispose(s_AudioQueue.queue, true);
+	_mixer->setReady(false);
+}