android_sles_conversions.h revision bb74f23cd3dc877c7eaf4db2132f724d11aeeb8f
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//---------------------- 24static inline SLuint32 android_to_sles_streamType(int type) { 25 return (SLuint32) type; 26} 27 28 29static 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//---------------------- 38static inline int sles_to_android_streamType(SLuint32 type) { 39 return (int)type; 40} 41 42 43static inline uint32_t sles_to_android_sampleRate(SLuint32 sampleRateMilliHertz) { 44 return (uint32_t)(sampleRateMilliHertz / 1000); 45} 46 47static inline audio_format_t 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_24: 56 return AUDIO_FORMAT_PCM_8_24_BIT; 57 // Maybe one of these??? 58 // return AUDIO_FORMAT_PCM_32_BIT; 59 // return AUDIO_FORMAT_PCM_24_BIT_PACKED; 60 break; 61 case SL_PCMSAMPLEFORMAT_FIXED_20: 62 case SL_PCMSAMPLEFORMAT_FIXED_28: 63 case SL_PCMSAMPLEFORMAT_FIXED_32: 64 default: 65 return AUDIO_FORMAT_INVALID; 66 } 67} 68 69 70static inline audio_channel_mask_t sles_to_android_channelMaskIn(SLuint32 nbChannels, 71 SLuint32 channelMask) { 72 // FIXME handle channel mask mapping between SL ES and Android 73 return audio_channel_in_mask_from_count(nbChannels); 74} 75 76 77static inline audio_channel_mask_t sles_to_android_channelMaskOut(SLuint32 nbChannels, 78 SLuint32 channelMask) { 79 // FIXME handle channel mask mapping between SL ES and Android 80 return audio_channel_out_mask_from_count(nbChannels); 81} 82 83 84static inline float sles_to_android_amplification(SLmillibel level) { 85 // FIXME use the FX Framework conversions 86 return pow(10, (float)level/2000); 87} 88 89 90static inline uint32_t channelCountToMask(uint32_t channelCount) 91{ 92 // FIXME channel mask is not yet implemented by Stagefright, so use a reasonable default 93 // that is computed from the channel count 94 uint32_t channelMask; 95 switch (channelCount) { 96 case 1: 97 // see explanation in data.c re: default channel mask for mono 98 return SL_SPEAKER_FRONT_LEFT; 99 case 2: 100 return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT; 101 // Android-specific 102 case 4: 103 return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT 104 | SL_SPEAKER_BACK_LEFT | SL_SPEAKER_BACK_RIGHT; 105 case 6: 106 return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT| SL_SPEAKER_FRONT_CENTER 107 | SL_SPEAKER_LOW_FREQUENCY 108 | SL_SPEAKER_BACK_LEFT | SL_SPEAKER_BACK_RIGHT; 109 case 8: 110 return SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT | SL_SPEAKER_FRONT_CENTER 111 | SL_SPEAKER_LOW_FREQUENCY 112 | SL_SPEAKER_BACK_LEFT | SL_SPEAKER_BACK_RIGHT 113 | SL_SPEAKER_SIDE_LEFT |SL_SPEAKER_SIDE_RIGHT; 114 default: 115 return UNKNOWN_CHANNELMASK; 116 } 117} 118