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/* This file contains shared utility functions to handle the tinyalsa 18 * implementation for Android internal audio, generally in the hardware layer. 19 * Some routines may log a fatal error on failure, as noted. 20 */ 21 22#ifndef ANDROID_AUDIO_ALSAOPS_H 23#define ANDROID_AUDIO_ALSAOPS_H 24 25#include <cutils/log.h> 26#include <system/audio.h> 27#include <tinyalsa/asoundlib.h> 28 29__BEGIN_DECLS 30 31/* Converts audio_format to pcm_format. 32 * Parameters: 33 * format the audio_format_t to convert 34 * 35 * Logs a fatal error if format is not a valid convertible audio_format_t. 36 */ 37static inline enum pcm_format pcm_format_from_audio_format(audio_format_t format) 38{ 39 switch (format) { 40#ifdef HAVE_BIG_ENDIAN 41 case AUDIO_FORMAT_PCM_16_BIT: 42 return PCM_FORMAT_S16_BE; 43 case AUDIO_FORMAT_PCM_24_BIT_PACKED: 44 return PCM_FORMAT_S24_3BE; 45 case AUDIO_FORMAT_PCM_32_BIT: 46 return PCM_FORMAT_S32_BE; 47 case AUDIO_FORMAT_PCM_8_24_BIT: 48 return PCM_FORMAT_S24_BE; 49#else 50 case AUDIO_FORMAT_PCM_16_BIT: 51 return PCM_FORMAT_S16_LE; 52 case AUDIO_FORMAT_PCM_24_BIT_PACKED: 53 return PCM_FORMAT_S24_3LE; 54 case AUDIO_FORMAT_PCM_32_BIT: 55 return PCM_FORMAT_S32_LE; 56 case AUDIO_FORMAT_PCM_8_24_BIT: 57 return PCM_FORMAT_S24_LE; 58#endif 59 case AUDIO_FORMAT_PCM_FLOAT: /* there is no equivalent for float */ 60 default: 61 LOG_ALWAYS_FATAL("pcm_format_from_audio_format: invalid audio format %#x", format); 62 return 0; 63 } 64} 65 66/* Converts pcm_format to audio_format. 67 * Parameters: 68 * format the pcm_format to convert 69 * 70 * Logs a fatal error if format is not a valid convertible pcm_format. 71 */ 72static inline audio_format_t audio_format_from_pcm_format(enum pcm_format format) 73{ 74 switch (format) { 75#ifdef HAVE_BIG_ENDIAN 76 case PCM_FORMAT_S16_BE: 77 return AUDIO_FORMAT_PCM_16_BIT; 78 case PCM_FORMAT_S24_3BE: 79 return AUDIO_FORMAT_PCM_24_BIT_PACKED; 80 case PCM_FORMAT_S24_BE: 81 return AUDIO_FORMAT_PCM_8_24_BIT; 82 case PCM_FORMAT_S32_BE: 83 return AUDIO_FORMAT_PCM_32_BIT; 84#else 85 case PCM_FORMAT_S16_LE: 86 return AUDIO_FORMAT_PCM_16_BIT; 87 case PCM_FORMAT_S24_3LE: 88 return AUDIO_FORMAT_PCM_24_BIT_PACKED; 89 case PCM_FORMAT_S24_LE: 90 return AUDIO_FORMAT_PCM_8_24_BIT; 91 case PCM_FORMAT_S32_LE: 92 return AUDIO_FORMAT_PCM_32_BIT; 93#endif 94 default: 95 LOG_ALWAYS_FATAL("audio_format_from_pcm_format: invalid pcm format %#x", format); 96 return 0; 97 } 98} 99 100__END_DECLS 101 102#endif /* ANDROID_AUDIO_ALSAOPS_H */ 103