Audio system update - HLE plugin submitted, homebrew has sound, and also Mario movies!! (this was very unexpected). This also acts as a frame limiter. Might provide an option to turn it off in the future.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@227 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.cpp

@@ -0,0 +1,99 @@
+// Copyright (C) 2003-2008 Dolphin Project.
+
+// 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, version 2.0.
+
+// 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 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+// This queue solution is temporary. I'll implement something more efficient later.
+
+#include <queue>
+#include "../Config.h"
+#include "../Globals.h"
+#include "../DSPHandler.h"
+#include "Thread.h"
+#include "Mixer.h"
+#ifdef _WIN32
+#include "../PCHW/DSoundStream.h"
+#endif
+
+namespace {
+Common::CriticalSection push_sync;
+
+// On real hardware, this fifo is much, much smaller. But timing is also tighter than under Windows, so...
+int queue_maxlength = 1024 * 8;
+std::queue<s16> sample_queue;
+}  // namespace
+
+volatile bool mixer_HLEready = false;
+volatile int queue_size = 0;
+
+void Mixer(short *buffer, int numSamples, int bits, int rate, int channels)
+{
+	// silence
+	memset(buffer, 0, numSamples * 2 * sizeof(short));
+
+	// first get th DTK Music
+	if (g_Config.m_EnableDTKMusic)
+	{
+		g_dspInitialize.pGetAudioStreaming(buffer, numSamples);
+	}
+
+	//if this was called directly from the HLE, and not by timeout
+	if (g_Config.m_EnableHLEAudio && (mixer_HLEready || g_Config.m_AntiGap))
+	{
+		IUCode* pUCode = CDSPHandler::GetInstance().GetUCode();
+		if (pUCode != NULL)
+			pUCode->MixAdd(buffer, numSamples);
+	}
+
+	push_sync.Enter();
+	int count = 0;
+	while (sample_queue.size() && count < numSamples * 2) {
+		int x = buffer[count];
+		short sample = sample_queue.front();
+		x += sample_queue.front();
+		if (x > 32767) x = 32767;
+		if (x < -32767) x = -32767;
+		buffer[count] = x;
+		count++;
+		sample_queue.pop();
+		queue_size--;
+	}
+	push_sync.Leave();
+}
+
+void Mixer_PushSamples(short *buffer, int num_stereo_samples, int sample_rate) {
+//	static FILE *f;
+//	if (!f)
+//		f = fopen("d:\\hello.raw", "wb");
+//	fwrite(buffer, num_stereo_samples * 4, 1, f);
+	static int fraction = 0;
+
+	while (queue_size > queue_maxlength / 2) {
+#ifdef _WIN32
+		DSound::DSound_UpdateSound();
+#endif
+		Sleep(0);
+	}
+	push_sync.Enter();
+	for (int i = 0; i < num_stereo_samples * 2; i++) {
+		while (fraction < 65536) {
+			sample_queue.push(buffer[i]);
+			queue_size++;
+			fraction += (65536ULL * sample_rate) / 48000;
+		}
+		fraction &= 0xFFFF;
+	}
+	push_sync.Leave();
+}