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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 audio_format_t sles_to_android_sampleFormat(const SLDataFormat_PCM *df_pcm) {
     48     switch (df_pcm->formatType) {
     49     case SL_DATAFORMAT_PCM:
     50         switch (df_pcm->containerSize) {
     51             case 8:
     52                 return AUDIO_FORMAT_PCM_8_BIT;
     53             case 16:
     54                 return AUDIO_FORMAT_PCM_16_BIT;
     55             case 24:
     56                 return AUDIO_FORMAT_PCM_24_BIT_PACKED;
     57             case 32:
     58                 return AUDIO_FORMAT_PCM_32_BIT;
     59             default:
     60                 return AUDIO_FORMAT_INVALID;
     61         }
     62     case SL_ANDROID_DATAFORMAT_PCM_EX:
     63         switch (((SLAndroidDataFormat_PCM_EX *)df_pcm)->representation) {
     64         case SL_ANDROID_PCM_REPRESENTATION_UNSIGNED_INT:
     65             switch (df_pcm->containerSize) {
     66             case 8:
     67                 return AUDIO_FORMAT_PCM_8_BIT;
     68             default:
     69                 return AUDIO_FORMAT_INVALID;
     70             }
     71         case SL_ANDROID_PCM_REPRESENTATION_SIGNED_INT:
     72             switch (df_pcm->containerSize) {
     73             case 16:
     74                 return AUDIO_FORMAT_PCM_16_BIT;
     75             case 24:
     76                 return AUDIO_FORMAT_PCM_24_BIT_PACKED;
     77             case 32:
     78                 return AUDIO_FORMAT_PCM_32_BIT;
     79             default:
     80                 return AUDIO_FORMAT_INVALID;
     81             }
     82         case SL_ANDROID_PCM_REPRESENTATION_FLOAT:
     83             switch (df_pcm->containerSize) {
     84             case 32:
     85                 return AUDIO_FORMAT_PCM_FLOAT;
     86             default:
     87                 return AUDIO_FORMAT_INVALID;
     88             }
     89         default:
     90             return AUDIO_FORMAT_INVALID;
     91         }
     92     default:
     93         return AUDIO_FORMAT_INVALID;
     94     }
     95 }
     96 
     97 
     98 static inline audio_channel_mask_t sles_to_android_channelMaskIn(SLuint32 nbChannels,
     99         SLuint32 channelMask) {
    100     // FIXME handle channel mask mapping between SL ES and Android
    101     return audio_channel_in_mask_from_count(nbChannels);
    102 }
    103 
    104 
    105 static inline audio_channel_mask_t sles_to_android_channelMaskOut(SLuint32 nbChannels,
    106         SLuint32 channelMask) {
    107     // FIXME handle channel mask mapping between SL ES and Android
    108     return audio_channel_out_mask_from_count(nbChannels);
    109 }
    110 
    111 
    112 static inline float sles_to_android_amplification(SLmillibel level) {
    113     // FIXME use the FX Framework conversions
    114     return pow(10, (float)level/2000);
    115 }
    116 
    117 
    118 static inline uint32_t channelCountToMask(uint32_t channelCount)
    119 {
    120     // FIXME channel mask is not yet implemented by Stagefright, so use a reasonable default
    121     //       that is computed from the channel count
    122     uint32_t channelMask;
    123     switch (channelCount) {
    124     case 1:
    125         // see explanation in data.c re: default channel mask for mono
    126         return SL_SPEAKER_FRONT_LEFT;
    127     case 2:
    128         return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
    129     // Android-specific
    130     case 4:
    131         return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT
    132                | SL_SPEAKER_BACK_LEFT | SL_SPEAKER_BACK_RIGHT;
    133     case 6:
    134         return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT| SL_SPEAKER_FRONT_CENTER
    135                | SL_SPEAKER_LOW_FREQUENCY
    136                | SL_SPEAKER_BACK_LEFT | SL_SPEAKER_BACK_RIGHT;
    137     case 8:
    138         return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT | SL_SPEAKER_FRONT_CENTER
    139                | SL_SPEAKER_LOW_FREQUENCY
    140                | SL_SPEAKER_BACK_LEFT | SL_SPEAKER_BACK_RIGHT
    141                | SL_SPEAKER_SIDE_LEFT |SL_SPEAKER_SIDE_RIGHT;
    142     default:
    143         return UNKNOWN_CHANNELMASK;
    144     }
    145 }
    146