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