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+/*----------------------------------------------------------------------------
+ *
+ * File:
+ * eas_mixer.h
+ *
+ * Contents and purpose:
+ * This file contains the critical components of the mix engine that
+ * must be optimized for best performance.
+ *
+ * Copyright Sonic Network Inc. 2005
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *----------------------------------------------------------------------------
+ * Revision Control:
+ * $Revision: 706 $
+ * $Date: 2007-05-31 17:22:51 -0700 (Thu, 31 May 2007) $
+ *----------------------------------------------------------------------------
+*/
+
+#ifndef _EAS_MIXER_H
+#define _EAS_MIXER_H
+
+//3 dls: This module is in the midst of being converted from a synth
+//3 specific module to a general purpose mix engine
+
+#define MIX_FLAGS_STEREO_SOURCE 1
+#define MIX_FLAGS_STEREO_OUTPUT 2
+#define NUM_MIXER_GUARD_BITS 4
+
+#include "eas_effects.h"
+
+extern void SynthMasterGain( long *pInputBuffer, EAS_PCM *pOutputBuffer, EAS_U16 nGain, EAS_U16 nNumLoopSamples);
+
+/*----------------------------------------------------------------------------
+ * EAS_MixEngineInit()
+ *----------------------------------------------------------------------------
+ * Purpose:
+ * Prepares the mix engine for work, allocates buffers, locates effects modules, etc.
+ *
+ * Inputs:
+ * pEASData - instance data
+ * pInstData - pointer to variable to receive instance data handle
+ *
+ * Outputs:
+ *
+ * Side Effects:
+ *
+ *----------------------------------------------------------------------------
+*/
+EAS_RESULT EAS_MixEngineInit (EAS_DATA_HANDLE pEASData);
+
+/*----------------------------------------------------------------------------
+ * EAS_MixEnginePrep()
+ *----------------------------------------------------------------------------
+ * Purpose:
+ * Performs prep before synthesize a buffer of audio, such as clearing
+ * audio buffers, etc.
+ *
+ * Inputs:
+ * psEASData - pointer to overall EAS data structure
+ *
+ * Outputs:
+ *
+ * Side Effects:
+ *
+ *----------------------------------------------------------------------------
+*/
+void EAS_MixEnginePrep (EAS_DATA_HANDLE pEASData, EAS_I32 nNumSamplesToAdd);
+
+/*----------------------------------------------------------------------------
+ * EAS_MixEnginePost
+ *----------------------------------------------------------------------------
+ * Purpose:
+ * This routine does the post-processing after all voices have been
+ * synthesized. It calls any sweeteners and does the final mixdown to
+ * the output buffer.
+ *
+ * Inputs:
+ *
+ * Outputs:
+ *
+ * Notes:
+ *----------------------------------------------------------------------------
+*/
+void EAS_MixEnginePost (EAS_DATA_HANDLE pEASData, EAS_I32 nNumSamplesToAdd);
+
+/*----------------------------------------------------------------------------
+ * EAS_MixEngineShutdown()
+ *----------------------------------------------------------------------------
+ * Purpose:
+ * Shuts down effects modules and deallocates memory
+ *
+ * Inputs:
+ * pEASData - instance data
+ * pInstData - instance data handle
+ *
+ * Outputs:
+ *
+ * Side Effects:
+ *
+ *----------------------------------------------------------------------------
+*/
+EAS_RESULT EAS_MixEngineShutdown (EAS_DATA_HANDLE pEASData);
+
+#ifdef UNIFIED_MIXER
+/*----------------------------------------------------------------------------
+ * EAS_MixStream
+ *----------------------------------------------------------------------------
+ * Mix a 16-bit stream into a 32-bit buffer
+ *
+ * pInputBuffer 16-bit input buffer
+ * pMixBuffer 32-bit mix buffer
+ * numSamples number of samples to mix
+ * gainLeft initial gain left or mono
+ * gainRight initial gain right
+ * gainLeft left gain increment per sample
+ * gainRight right gain increment per sample
+ * flags bit 0 = stereo source
+ * bit 1 = stereo output
+ *----------------------------------------------------------------------------
+*/
+void EAS_MixStream (EAS_PCM *pInputBuffer, EAS_I32 *pMixBuffer, EAS_I32 numSamples, EAS_I32 gainLeft, EAS_I32 gainRight, EAS_I32 gainIncLeft, EAS_I32 gainIncRight, EAS_I32 flags);
+#endif
+
+#endif /* #ifndef _EAS_MIXER_H */
+