123 lines
4.0 KiB
C
123 lines
4.0 KiB
C
/****************************************************************************
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* include/nuttx/audio/audio_null.h
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* A do-nothinig audio device driver to simplify testing of audio decoders.
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_AUDIO_AUDIO_NULL_H
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#define __INCLUDE_NUTTX_AUDIO_AUDIO_NULL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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#include <stdbool.h>
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#include <nuttx/irq.h>
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#ifdef CONFIG_AUDIO_NULL
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************
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*
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* CONFIG_AUDIO_NULL - Enabled NULL audio device support
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* CONFIG_AUDIO_NULL_MSG_PRIO - Priority of messages sent to the NULL audio
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* device worker thread.
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* CONFIG_AUDIO_NULL_BUFFER_SIZE - Preferred buffer size
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* CONFIG_AUDIO_NULL_NUM_BUFFERS - Preferred number of buffers
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* CONFIG_AUDIO_NULL_WORKER_STACKSIZE - Stack size to use when creating the
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* NULL audio device worker thread.
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*/
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/* Pre-requisites */
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#ifndef CONFIG_AUDIO
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# error CONFIG_AUDIO is required for audio subsystem support
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#endif
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/* Default configuration values */
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#ifndef CONFIG_AUDIO_NULL_MSG_PRIO
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# define CONFIG_AUDIO_NULL_MSG_PRIO 1
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#endif
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#ifndef CONFIG_AUDIO_NULL_BUFFER_SIZE
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# define CONFIG_AUDIO_NULL_BUFFER_SIZE 8192
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#endif
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#ifndef CONFIG_AUDIO_NULL_NUM_BUFFERS
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# define CONFIG_AUDIO_NULL_NUM_BUFFERS 4
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#endif
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#ifndef CONFIG_AUDIO_NULL_WORKER_STACKSIZE
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# define CONFIG_AUDIO_NULL_WORKER_STACKSIZE 768
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: audio_null_initialize
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*
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* Description:
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* Initialize the null audio device.
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*
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* Input Parameters:
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* i2c - An I2C driver instance
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* i2s - An I2S driver instance
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* lower - Persistent board configuration data
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*
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* Returned Value:
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* A new lower half audio interface for the NULL audio device is returned
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* on success; NULL is returned on failure.
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*
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****************************************************************************/
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struct audio_lowerhalf_s; /* Forward reference. Defined in nuttx/audio/audio.h */
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FAR struct audio_lowerhalf_s *audio_null_initialize(void);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_AUDIO_NULL */
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#endif /* __INCLUDE_NUTTX_AUDIO_AUDIO_NULL_H */
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