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