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      1 /*
      2  * Copyright (C) 2010 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 #include "math.h"
     18 
     19 #include <system/audio.h>
     20 
     21 //-----------------------------------------------------------------------------
     22 // OpenSL ES to Android
     23 //----------------------
     24 
     25 static inline uint32_t sles_to_android_sampleRate(SLuint32 sampleRateMilliHertz) {
     26     return (uint32_t)(sampleRateMilliHertz / 1000);
     27 }
     28 
     29 static inline audio_format_t sles_to_android_sampleFormat(const SLDataFormat_PCM *df_pcm) {
     30     if (df_pcm->containerSize != df_pcm->bitsPerSample) {
     31         return AUDIO_FORMAT_INVALID;
     32     }
     33     switch (df_pcm->formatType) {
     34     case SL_DATAFORMAT_PCM:
     35         switch (df_pcm->containerSize) {
     36         case 8:
     37             return AUDIO_FORMAT_PCM_8_BIT;
     38         case 16:
     39             return AUDIO_FORMAT_PCM_16_BIT;
     40         case 24:
     41             return AUDIO_FORMAT_PCM_24_BIT_PACKED;
     42         case 32:
     43             return AUDIO_FORMAT_PCM_32_BIT;
     44         default:
     45             return AUDIO_FORMAT_INVALID;
     46         }
     47     case SL_ANDROID_DATAFORMAT_PCM_EX:
     48         switch (((SLAndroidDataFormat_PCM_EX *)df_pcm)->representation) {
     49         case SL_ANDROID_PCM_REPRESENTATION_UNSIGNED_INT:
     50             switch (df_pcm->containerSize) {
     51             case 8:
     52                 return AUDIO_FORMAT_PCM_8_BIT;
     53             default:
     54                 return AUDIO_FORMAT_INVALID;
     55             }
     56         case SL_ANDROID_PCM_REPRESENTATION_SIGNED_INT:
     57             switch (df_pcm->containerSize) {
     58             case 16:
     59                 return AUDIO_FORMAT_PCM_16_BIT;
     60             case 24:
     61                 return AUDIO_FORMAT_PCM_24_BIT_PACKED;
     62             case 32:
     63                 return AUDIO_FORMAT_PCM_32_BIT;
     64             default:
     65                 return AUDIO_FORMAT_INVALID;
     66             }
     67         case SL_ANDROID_PCM_REPRESENTATION_FLOAT:
     68             switch (df_pcm->containerSize) {
     69             case 32:
     70                 return AUDIO_FORMAT_PCM_FLOAT;
     71             default:
     72                 return AUDIO_FORMAT_INVALID;
     73             }
     74         default:
     75             return AUDIO_FORMAT_INVALID;
     76         }
     77     default:
     78         return AUDIO_FORMAT_INVALID;
     79     }
     80 }
     81 
     82 
     83 static inline float sles_to_android_amplification(SLmillibel level) {
     84     // FIXME use the FX Framework conversions
     85     return pow(10, (float)level/2000);
     86 }
     87