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      1 /*----------------------------------------------------------------------------
      2  *
      3  * File:
      4  * eas_wt_IPC_frame.h
      5  *
      6  * Contents and purpose:
      7  * This module contains data definitions for the interprocessor
      8  * communications framework for a split-architecture synthesizer.
      9  *
     10  * This sample version writes IPC data to a file that can be used
     11  * as a test vector for the DSP simulator. For a real-time system
     12  * the file I/O is replaced with an IPC protocol in the hardware.
     13  *
     14  * Synchronization with the DSP is accomplished at the API level,
     15  * i.e. the host code should call EAS_Render when it is ready to
     16  * buffer another block of data for transmission to the DSP.
     17  *
     18  * Copyright Sonic Network Inc. 2005
     19 
     20  * Licensed under the Apache License, Version 2.0 (the "License");
     21  * you may not use this file except in compliance with the License.
     22  * You may obtain a copy of the License at
     23  *
     24  *      http://www.apache.org/licenses/LICENSE-2.0
     25  *
     26  * Unless required by applicable law or agreed to in writing, software
     27  * distributed under the License is distributed on an "AS IS" BASIS,
     28  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     29  * See the License for the specific language governing permissions and
     30  * limitations under the License.
     31  *
     32  *----------------------------------------------------------------------------
     33  * Revision Control:
     34  *   $Revision: 818 $
     35  *   $Date: 2007-08-02 15:19:41 -0700 (Thu, 02 Aug 2007) $
     36  *----------------------------------------------------------------------------
     37 */
     38 
     39 #ifndef _EAS_WT_IPC_FRAME_H
     40 #define _EAS_WT_IPC_FRAME_H
     41 
     42 /*----------------------------------------------------------------------------
     43  * S_WT_FRAME
     44  *
     45  * This structure contains the common parameters that are updated
     46   *for each frame of audio.
     47  *----------------------------------------------------------------------------
     48 */
     49 typedef struct s_wt_frame_tag
     50 {
     51     EAS_I32         gainTarget;
     52     EAS_I32         phaseIncrement;
     53 
     54 #if defined(_FILTER_ENABLED)
     55     EAS_I32         k;
     56     EAS_I32         b1;
     57     EAS_I32         b2;
     58 #endif
     59 } S_WT_FRAME;
     60 
     61 /*----------------------------------------------------------------------------
     62  * S_WT_CONFIG
     63  *
     64  * This structure contains state data for the wavetable engine
     65  *----------------------------------------------------------------------------
     66 */
     67 typedef struct s_wt_config_tag
     68 {
     69     EAS_U32             loopEnd;                /* points to last PCM sample (not 1 beyond last) */
     70     EAS_U32             loopStart;              /* points to first sample at start of loop */
     71     EAS_U32             phaseAccum;             /* current sample, integer portion of phase */
     72 
     73 #if (NUM_OUTPUT_CHANNELS == 2)
     74     EAS_I16             gainLeft;               /* left channel gain */
     75     EAS_I16             gainRight;              /* right channel gain */
     76 #endif
     77 
     78     EAS_I16             gain;                   /* current voice gain */
     79 } S_WT_CONFIG;
     80 
     81 #endif
     82 
     83