166 lines
5.7 KiB
C
166 lines
5.7 KiB
C
/****************************************************************************
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* audio/buffer.c
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*
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* Copyright (C) 2013 Ken Pettit. All rights reserved.
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* Author: Ken Pettit <pettitkd@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <semaphore.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/audio.h>
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#include <nuttx/usb/audio.h>
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#if defined(CONFIG_AUDIO)
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/****************************************************************************
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* Preprocessor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: apb_semtake
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*
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* Take an Audio Pipeline Buffer.
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*
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****************************************************************************/
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static void apb_semtake(sem_t *sem)
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{
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/* Take the semaphore (perhaps waiting) */
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while (sem_wait(sem) != 0)
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{
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/* The only case that an error should occr here is if
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* the wait was awakened by a signal.
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*/
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ASSERT(errno == EINTR);
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}
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}
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/****************************************************************************
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* Name: apb_semgive
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****************************************************************************/
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#define apb_semgive(s) sem_post(s)
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/****************************************************************************
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* Name: apb_alloc
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*
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* Allocate an Audio Pipeline Buffer for use in the Audio sub-system. This
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* will perform the actual allocate based on buffer data format, number of
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* channels, etc. and prepare the buffer for consumption.
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*
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****************************************************************************/
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FAR struct ap_buffer_s *apb_alloc(int type, int sampleCount)
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{
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/* TODO: Implement the alloc logic */
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return NULL;
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}
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/****************************************************************************
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* Name: apb_prepare
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*
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* Prepare an AP Buffer for use in the Audio Pipeline.
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*
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****************************************************************************/
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void apb_prepare(FAR struct ap_buffer_s *apb, int8_t allocmode, uint8_t format,
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uint8_t subformat, apb_samp_t maxsamples)
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{
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/* Perform a reference count decrement and possibly release the memory */
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}
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/****************************************************************************
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* Name: apb_free
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*
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* Free's a previously allocated or referenced Audio Pipeline Buffer
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*
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****************************************************************************/
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void apb_free(FAR struct ap_buffer_s *apb)
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{
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/* Perform a reference count decrement and possibly release the memory */
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}
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/****************************************************************************
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* Name: apb_reference
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*
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* Claim a reference to an Audio Pipeline Buffer. Each call to apb_reference
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* will increment the reference count and must have a matching apb_free
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* call. When the refcount decrements to zero, the buffer will be freed.
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*
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****************************************************************************/
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void apb_reference(FAR struct ap_buffer_s *apb)
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{
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/* TODO: Implement the reference logic */
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}
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#endif /* CONFIG_AUDIO */
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