1 files changed, 133 insertions, 0 deletions
diff --git a/source/plugin/PluginGain.c b/source/plugin/PluginGain.c
new file mode 100644
index 0000000..d2f21b9
--- /dev/null
+++ b/source/plugin/PluginGain.c
@@ -0,0 +1,133 @@
+//
+// PluginGain.c - MrsWatson
+// Created by Nik Reiman on 26 May 14.
+// Copyright (c) 2014 Teragon Audio. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+
+#include "audio/SampleBuffer.h"
+#include "logging/EventLogger.h"
+#include "plugin/PluginGain.h"
+
+const char *kInternalPluginGainName = INTERNAL_PLUGIN_PREFIX "gain";
+
+static void _pluginGainEmpty(void *pluginPtr)
+{
+    // Nothing to do here
+}
+
+static boolByte _pluginGainOpen(void *pluginPtr)
+{
+    return true;
+}
+
+static void _pluginGainGetAbsolutePath(void *pluginPtr, CharString outPath)
+{
+    // Internal plugins don't have a path, and thus can't be copied. So just copy
+    // an empty string here and let any callers needing the absolute path to check
+    // for this value before doing anything important.
+    charStringClear(outPath);
+}
+
+static void _pluginGainDisplayInfo(void *pluginPtr)
+{
+    logInfo("Information for Internal plugin '%s'", kInternalPluginGainName);
+    logInfo("Type: effect, parameters: none");
+    logInfo("Description: a basic gain effect");
+}
+
+static int _pluginGainGetSetting(void *pluginPtr, PluginSetting pluginSetting)
+{
+    switch (pluginSetting) {
+    case PLUGIN_SETTING_TAIL_TIME_IN_MS:
+        return 0;
+
+    case PLUGIN_NUM_INPUTS:
+        return 2;
+
+    case PLUGIN_NUM_OUTPUTS:
+        return 2;
+
+    default:
+        return 0;
+    }
+}
+
+static void _pluginGainProcessAudio(void *pluginPtr, SampleBuffer inputs, SampleBuffer outputs)
+{
+    Plugin plugin = (Plugin)pluginPtr;
+    PluginGainSettings settings = (PluginGainSettings)plugin->extraData;
+    unsigned long channel, sample;
+
+    sampleBufferCopyAndMapChannels(outputs, inputs);
+
+    for (channel = 0; channel < outputs->numChannels; ++channel) {
+        for (sample = 0; sample < outputs->blocksize; ++sample) {
+            outputs->samples[channel][sample] *= settings->gain;
+        }
+    }
+}
+
+static void _pluginGainProcessMidiEvents(void *pluginPtr, LinkedList midiEvents)
+{
+    // Nothing to do here
+}
+
+static boolByte _pluginGainSetParameter(void *pluginPtr, unsigned int i, float value)
+{
+    Plugin plugin = (Plugin)pluginPtr;
+    PluginGainSettings settings = (PluginGainSettings)plugin->extraData;
+
+    switch (i) {
+    case PLUGIN_GAIN_SETTINGS_GAIN:
+        settings->gain = value;
+        return true;
+
+    default:
+        logError("Attempt to set invalid parameter %d on internal gain plugin", i);
+        return false;
+    }
+}
+
+Plugin newPluginGain(const CharString pluginName)
+{
+    Plugin plugin = _newPlugin(PLUGIN_TYPE_INTERNAL, PLUGIN_TYPE_EFFECT);
+    PluginGainSettings settings = (PluginGainSettings)malloc(sizeof(PluginGainSettingsMembers));
+
+    charStringCopy(plugin->pluginName, pluginName);
+    charStringCopyCString(plugin->pluginLocation, "Internal");
+
+    plugin->openPlugin = _pluginGainOpen;
+    plugin->displayInfo = _pluginGainDisplayInfo;
+    plugin->getSetting = _pluginGainGetSetting;
+    plugin->prepareForProcessing = _pluginGainEmpty;
+    plugin->processAudio = _pluginGainProcessAudio;
+    plugin->processMidiEvents = _pluginGainProcessMidiEvents;
+    plugin->setParameter = _pluginGainSetParameter;
+    plugin->closePlugin = _pluginGainEmpty;
+    plugin->freePluginData = _pluginGainEmpty;
+
+    settings->gain = 1.0f;
+    plugin->extraData = settings;
+    return plugin;
+}