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      1 /*
      2  * Copyright (C) 2014 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_MEDIA_AUDIOFORMAT_H
     18 #define ANDROID_MEDIA_AUDIOFORMAT_H
     19 
     20 #include <system/audio.h>
     21 
     22 // keep these values in sync with AudioFormat.java
     23 #define ENCODING_PCM_16BIT      2
     24 #define ENCODING_PCM_8BIT       3
     25 #define ENCODING_PCM_FLOAT      4
     26 #define ENCODING_AC3            5
     27 #define ENCODING_E_AC3          6
     28 #define ENCODING_DTS            7
     29 #define ENCODING_DTS_HD         8
     30 #define ENCODING_MP3            9
     31 #define ENCODING_AAC_LC         10
     32 #define ENCODING_AAC_HE_V1      11
     33 #define ENCODING_AAC_HE_V2      12
     34 #define ENCODING_IEC61937       13
     35 #define ENCODING_DOLBY_TRUEHD   14
     36 
     37 #define ENCODING_INVALID    0
     38 #define ENCODING_DEFAULT    1
     39 
     40 
     41 
     42 #define CHANNEL_INVALID 0
     43 #define CHANNEL_OUT_DEFAULT 1
     44 
     45 static inline audio_format_t audioFormatToNative(int audioFormat)
     46 {
     47     switch (audioFormat) {
     48     case ENCODING_PCM_16BIT:
     49         return AUDIO_FORMAT_PCM_16_BIT;
     50     case ENCODING_PCM_8BIT:
     51         return AUDIO_FORMAT_PCM_8_BIT;
     52     case ENCODING_PCM_FLOAT:
     53         return AUDIO_FORMAT_PCM_FLOAT;
     54     case ENCODING_AC3:
     55         return AUDIO_FORMAT_AC3;
     56     case ENCODING_E_AC3:
     57         return AUDIO_FORMAT_E_AC3;
     58     case ENCODING_DTS:
     59         return AUDIO_FORMAT_DTS;
     60     case ENCODING_DTS_HD:
     61         return AUDIO_FORMAT_DTS_HD;
     62     case ENCODING_MP3:
     63         return AUDIO_FORMAT_MP3;
     64     case ENCODING_AAC_LC:
     65         return AUDIO_FORMAT_AAC_LC;
     66     case ENCODING_AAC_HE_V1:
     67         return AUDIO_FORMAT_AAC_HE_V1;
     68     case ENCODING_AAC_HE_V2:
     69         return AUDIO_FORMAT_AAC_HE_V2;
     70     case ENCODING_DOLBY_TRUEHD:
     71         return AUDIO_FORMAT_DOLBY_TRUEHD;
     72     case ENCODING_IEC61937:
     73         return AUDIO_FORMAT_IEC61937;
     74     case ENCODING_DEFAULT:
     75         return AUDIO_FORMAT_DEFAULT;
     76     default:
     77         return AUDIO_FORMAT_INVALID;
     78     }
     79 }
     80 
     81 static inline int audioFormatFromNative(audio_format_t nativeFormat)
     82 {
     83     switch (nativeFormat) {
     84     case AUDIO_FORMAT_PCM_16_BIT:
     85         return ENCODING_PCM_16BIT;
     86     case AUDIO_FORMAT_PCM_8_BIT:
     87         return ENCODING_PCM_8BIT;
     88     case AUDIO_FORMAT_PCM_FLOAT:
     89         return ENCODING_PCM_FLOAT;
     90 
     91     // map these to ENCODING_PCM_FLOAT
     92     case AUDIO_FORMAT_PCM_8_24_BIT:
     93     case AUDIO_FORMAT_PCM_24_BIT_PACKED:
     94     case AUDIO_FORMAT_PCM_32_BIT:
     95         return ENCODING_PCM_FLOAT;
     96 
     97     case AUDIO_FORMAT_AC3:
     98         return ENCODING_AC3;
     99     case AUDIO_FORMAT_E_AC3:
    100         return ENCODING_E_AC3;
    101     case AUDIO_FORMAT_DTS:
    102         return ENCODING_DTS;
    103     case AUDIO_FORMAT_DTS_HD:
    104         return ENCODING_DTS_HD;
    105     case AUDIO_FORMAT_MP3:
    106         return ENCODING_MP3;
    107     case AUDIO_FORMAT_AAC_LC:
    108         return ENCODING_AAC_LC;
    109     case AUDIO_FORMAT_AAC_HE_V1:
    110         return ENCODING_AAC_HE_V1;
    111     case AUDIO_FORMAT_AAC_HE_V2:
    112         return ENCODING_AAC_HE_V2;
    113     case AUDIO_FORMAT_IEC61937:
    114         return ENCODING_IEC61937;
    115     case AUDIO_FORMAT_DOLBY_TRUEHD:
    116         return ENCODING_DOLBY_TRUEHD;
    117     case AUDIO_FORMAT_DEFAULT:
    118         return ENCODING_DEFAULT;
    119     default:
    120         return ENCODING_INVALID;
    121     }
    122 }
    123 
    124 static inline audio_channel_mask_t outChannelMaskToNative(int channelMask)
    125 {
    126     switch (channelMask) {
    127     case CHANNEL_OUT_DEFAULT:
    128     case CHANNEL_INVALID:
    129         return AUDIO_CHANNEL_NONE;
    130     default:
    131         return (audio_channel_mask_t)(channelMask>>2);
    132     }
    133 }
    134 
    135 static inline int outChannelMaskFromNative(audio_channel_mask_t nativeMask)
    136 {
    137     switch (nativeMask) {
    138     case AUDIO_CHANNEL_NONE:
    139         return CHANNEL_OUT_DEFAULT;
    140     default:
    141         return (int)nativeMask<<2;
    142     }
    143 }
    144 
    145 static inline audio_channel_mask_t inChannelMaskToNative(int channelMask)
    146 {
    147     return (audio_channel_mask_t)channelMask;
    148 }
    149 
    150 static inline int inChannelMaskFromNative(audio_channel_mask_t nativeMask)
    151 {
    152     return (int)nativeMask;
    153 }
    154 
    155 #endif // ANDROID_MEDIA_AUDIOFORMAT_H
    156