RECORDER: Implement Events Recorder

2 files changed, 137 insertions, 0 deletions

diff --git a/backends/mixer/nullmixer/nullsdl-mixer.cpp b/backends/mixer/nullmixer/nullsdl-mixer.cpp
new file mode 100644
index 0000000000..2fd652e19f
--- /dev/null
+++ b/backends/mixer/nullmixer/nullsdl-mixer.cpp
@@ -0,0 +1,75 @@
+/* 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 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 "backends/mixer/nullmixer/nullsdl-mixer.h"
+#include "common/savefile.h"
+
+NullSdlMixerManager::NullSdlMixerManager() : SdlMixerManager() {
+	_outputRate = 22050;
+	_callsCounter = 0;
+	_callbackPeriod = 10;
+	_samples = 8192;
+	while (_samples * 16 > _outputRate * 2)
+		_samples >>= 1;
+	_samplesBuf = new uint8[_samples * 4];
+}
+
+NullSdlMixerManager::~NullSdlMixerManager() {
+	delete _samplesBuf;
+}
+
+void NullSdlMixerManager::init() {
+	_mixer = new Audio::MixerImpl(g_system, _outputRate);
+	assert(_mixer);
+	_mixer->setReady(true);
+}
+
+void NullSdlMixerManager::suspendAudio() {
+	_audioSuspended = true;
+}
+
+int NullSdlMixerManager::resumeAudio() {
+	if (!_audioSuspended) {
+		return -2;
+	}
+	_audioSuspended = false;
+	return 0;
+}
+
+
+void NullSdlMixerManager::startAudio() {
+}
+
+void NullSdlMixerManager::callbackHandler(byte *samples, int len) {
+	assert(_mixer);
+	_mixer->mixCallback(samples, len);
+}
+
+void NullSdlMixerManager::update() {
+	if (_audioSuspended) {
+		return;
+	}
+	_callsCounter++;
+	if ((_callsCounter % _callbackPeriod) == 0) {
+		callbackHandler(_samplesBuf, _samples);
+	}
+}
diff --git a/backends/mixer/nullmixer/nullsdl-mixer.h b/backends/mixer/nullmixer/nullsdl-mixer.h
new file mode 100644
index 0000000000..94248ced66
--- /dev/null
+++ b/backends/mixer/nullmixer/nullsdl-mixer.h
@@ -0,0 +1,62 @@
+/* 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 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.
+ *
+ */
+
+#ifndef BACKENDS_MIXER_NULLSDL_H
+#define BACKENDS_MIXER_NULLSDL_H
+
+#include "backends/mixer/sdl/sdl-mixer.h"
+#include "common/str.h"
+
+/** Audio mixer which in fact does not output audio.
+ *
+ *  It is used by events recorder since the recorder is intentionally
+ *  turning sound off to avoid stuttering.
+ *
+ *  It returns correct output and shoots callbacks, so all OSystem
+ *  users could work without modifications.
+ */
+
+class NullSdlMixerManager :	public SdlMixerManager {
+public:
+	NullSdlMixerManager();
+	virtual ~NullSdlMixerManager();
+
+	virtual void init();
+	void update();
+
+	virtual void suspendAudio();
+	virtual int resumeAudio();
+
+protected:
+
+	virtual void startAudio();
+	virtual void callbackHandler(byte *samples, int len);
+
+private:
+	uint32 _outputRate;
+	uint32 _callsCounter;
+	uint8  _callbackPeriod;
+	uint32 _samples;
+	uint8 *_samplesBuf;
+};
+
+#endif