103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
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/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* This file contains shared utility functions to handle the tinyalsa
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* implementation for Android internal audio, generally in the hardware layer.
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* Some routines may log a fatal error on failure, as noted.
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*/
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#ifndef ANDROID_AUDIO_ALSAOPS_H
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#define ANDROID_AUDIO_ALSAOPS_H
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#include <cutils/log.h>
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#include <system/audio.h>
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#include <tinyalsa/asoundlib.h>
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__BEGIN_DECLS
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/* Converts audio_format to pcm_format.
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* Parameters:
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* format the audio_format_t to convert
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*
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* Logs a fatal error if format is not a valid convertible audio_format_t.
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*/
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static inline enum pcm_format pcm_format_from_audio_format(audio_format_t format)
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{
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switch (format) {
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#ifdef HAVE_BIG_ENDIAN
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case AUDIO_FORMAT_PCM_16_BIT:
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return PCM_FORMAT_S16_BE;
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case AUDIO_FORMAT_PCM_24_BIT_PACKED:
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return PCM_FORMAT_S24_3BE;
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case AUDIO_FORMAT_PCM_32_BIT:
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return PCM_FORMAT_S32_BE;
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case AUDIO_FORMAT_PCM_8_24_BIT:
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return PCM_FORMAT_S24_BE;
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#else
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case AUDIO_FORMAT_PCM_16_BIT:
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return PCM_FORMAT_S16_LE;
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case AUDIO_FORMAT_PCM_24_BIT_PACKED:
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return PCM_FORMAT_S24_3LE;
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case AUDIO_FORMAT_PCM_32_BIT:
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return PCM_FORMAT_S32_LE;
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case AUDIO_FORMAT_PCM_8_24_BIT:
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return PCM_FORMAT_S24_LE;
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#endif
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case AUDIO_FORMAT_PCM_FLOAT: /* there is no equivalent for float */
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default:
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LOG_ALWAYS_FATAL("pcm_format_from_audio_format: invalid audio format %#x", format);
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return 0;
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}
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}
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/* Converts pcm_format to audio_format.
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* Parameters:
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* format the pcm_format to convert
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*
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* Logs a fatal error if format is not a valid convertible pcm_format.
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*/
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static inline audio_format_t audio_format_from_pcm_format(enum pcm_format format)
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{
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switch (format) {
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#ifdef HAVE_BIG_ENDIAN
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case PCM_FORMAT_S16_BE:
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return AUDIO_FORMAT_PCM_16_BIT;
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case PCM_FORMAT_S24_3BE:
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return AUDIO_FORMAT_PCM_24_BIT_PACKED;
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case PCM_FORMAT_S24_BE:
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return AUDIO_FORMAT_PCM_8_24_BIT;
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case PCM_FORMAT_S32_BE:
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return AUDIO_FORMAT_PCM_32_BIT;
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#else
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case PCM_FORMAT_S16_LE:
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return AUDIO_FORMAT_PCM_16_BIT;
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case PCM_FORMAT_S24_3LE:
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return AUDIO_FORMAT_PCM_24_BIT_PACKED;
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case PCM_FORMAT_S24_LE:
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return AUDIO_FORMAT_PCM_8_24_BIT;
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case PCM_FORMAT_S32_LE:
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return AUDIO_FORMAT_PCM_32_BIT;
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#endif
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default:
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LOG_ALWAYS_FATAL("audio_format_from_pcm_format: invalid pcm format %#x", format);
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return 0;
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}
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}
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__END_DECLS
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#endif /* ANDROID_AUDIO_ALSAOPS_H */
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