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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 // Android to OpenSL ES
     23 //----------------------
     24 static inline SLuint32 android_to_sles_streamType(int type) {
     25     return (SLuint32) type;
     26 }
     27 
     28 
     29 static inline SLuint32 android_to_sles_sampleRate(uint32_t srHz) {
     30     // convert to milliHertz
     31     return (SLuint32) srHz*1000;
     32 }
     33 
     34 
     35 //-----------------------------------------------------------------------------
     36 // OpenSL ES to Android
     37 //----------------------
     38 static inline int sles_to_android_streamType(SLuint32 type) {
     39     return (int)type;
     40 }
     41 
     42 
     43 static inline uint32_t sles_to_android_sampleRate(SLuint32 sampleRateMilliHertz) {
     44     return (uint32_t)(sampleRateMilliHertz / 1000);
     45 }
     46 
     47 static inline int sles_to_android_sampleFormat(SLuint32 pcmFormat) {
     48     switch (pcmFormat) {
     49         case SL_PCMSAMPLEFORMAT_FIXED_16:
     50             return AUDIO_FORMAT_PCM_16_BIT;
     51             break;
     52         case SL_PCMSAMPLEFORMAT_FIXED_8:
     53             return AUDIO_FORMAT_PCM_8_BIT;
     54             break;
     55         case SL_PCMSAMPLEFORMAT_FIXED_20:
     56         case SL_PCMSAMPLEFORMAT_FIXED_24:
     57         case SL_PCMSAMPLEFORMAT_FIXED_28:
     58         case SL_PCMSAMPLEFORMAT_FIXED_32:
     59         default:
     60             return AUDIO_FORMAT_INVALID;
     61     }
     62 }
     63 
     64 
     65 static inline int sles_to_android_channelMaskIn(SLuint32 nbChannels, SLuint32 channelMask) {
     66     // FIXME handle channel mask mapping between SL ES and Android
     67     return (nbChannels == 1 ?
     68             AUDIO_CHANNEL_IN_MONO :
     69             AUDIO_CHANNEL_IN_STEREO);
     70 }
     71 
     72 
     73 static inline int sles_to_android_channelMaskOut(SLuint32 nbChannels, SLuint32 channelMask) {
     74     // FIXME handle channel mask mapping between SL ES and Android
     75     return (nbChannels == 1 ?
     76             AUDIO_CHANNEL_OUT_MONO :
     77             AUDIO_CHANNEL_OUT_STEREO);
     78 }
     79 
     80 
     81 static inline float sles_to_android_amplification(SLmillibel level) {
     82     // FIXME use the FX Framework conversions
     83     return pow(10, (float)level/2000);
     84 }
     85 
     86 
     87 static inline uint32_t channelCountToMask(uint32_t channelCount)
     88 {
     89     // FIXME channel mask is not yet implemented by Stagefright, so use a reasonable default
     90     //       that is computed from the channel count
     91     uint32_t channelMask;
     92     switch (channelCount) {
     93     case 1:
     94         // see explanation in data.c re: default channel mask for mono
     95         return SL_SPEAKER_FRONT_LEFT;
     96     case 2:
     97         return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
     98     default:
     99         return UNKNOWN_CHANNELMASK;
    100     }
    101 }
    102