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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_EFFECT_VISUALIZER_H_
     18 #define ANDROID_EFFECT_VISUALIZER_H_
     19 
     20 #include <hardware/audio_effect.h>
     21 
     22 #if __cplusplus
     23 extern "C" {
     24 #endif
     25 
     26 #ifndef OPENSL_ES_H_
     27 static const effect_uuid_t SL_IID_VISUALIZATION_ =
     28     { 0xe46b26a0, 0xdddd, 0x11db, 0x8afd, { 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b } };
     29 const effect_uuid_t * const SL_IID_VISUALIZATION = &SL_IID_VISUALIZATION_;
     30 #endif //OPENSL_ES_H_
     31 
     32 #define VISUALIZER_CAPTURE_SIZE_MAX 1024  // maximum capture size in samples
     33 #define VISUALIZER_CAPTURE_SIZE_MIN 128   // minimum capture size in samples
     34 
     35 // to keep in sync with frameworks/base/media/java/android/media/audiofx/Visualizer.java
     36 #define VISUALIZER_SCALING_MODE_NORMALIZED 0
     37 #define VISUALIZER_SCALING_MODE_AS_PLAYED  1
     38 
     39 #define MEASUREMENT_MODE_NONE      0x0
     40 #define MEASUREMENT_MODE_PEAK_RMS  0x1
     41 
     42 #define MEASUREMENT_IDX_PEAK 0
     43 #define MEASUREMENT_IDX_RMS  1
     44 
     45 /* enumerated parameters for Visualizer effect */
     46 typedef enum
     47 {
     48     VISUALIZER_PARAM_CAPTURE_SIZE, // Sets the number PCM samples in the capture.
     49     VISUALIZER_PARAM_SCALING_MODE, // Sets the way the captured data is scaled
     50     VISUALIZER_PARAM_LATENCY,      // Informs the visualizer about the downstream latency
     51     VISUALIZER_PARAM_MEASUREMENT_MODE, // Sets which measurements are to be made
     52 } t_visualizer_params;
     53 
     54 /* commands */
     55 typedef enum
     56 {
     57     VISUALIZER_CMD_CAPTURE = EFFECT_CMD_FIRST_PROPRIETARY, // Gets the latest PCM capture.
     58     VISUALIZER_CMD_MEASURE, // Gets the current measurements
     59 }t_visualizer_cmds;
     60 
     61 // VISUALIZER_CMD_CAPTURE retrieves the latest PCM snapshot captured by the visualizer engine.
     62 // It returns the number of samples specified by VISUALIZER_PARAM_CAPTURE_SIZE
     63 // in 8 bit unsigned format (0 = 0x80)
     64 
     65 // VISUALIZER_CMD_MEASURE retrieves the lastest measurements as int32_t saved in the
     66 // MEASUREMENT_IDX_* array index order.
     67 
     68 #if __cplusplus
     69 }  // extern "C"
     70 #endif
     71 
     72 
     73 #endif /*ANDROID_EFFECT_VISUALIZER_H_*/
     74