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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* PCM output buffer declarations
*
* Copyright (c) 2007 Michael Sevakis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef PCM_OUTPUT_H
#define PCM_OUTPUT_H
#ifndef ALIGNED_ATTR
#define ALIGNED_ATTR(x) __attribute__((aligned(x)))
#endif
#define PCM_HDR_SIZE (sizeof (struct pcm_frame_header))
#define PCMOUT_BUFSIZE ((48000/2)*4) /* 1/2 s @48kHz */
#define PCMOUT_HIGH_WM ((PCMOUT_BUFSIZE*3)/4)
#define PCMOUT_PLAY_WM (PCMOUT_BUFSIZE/4)
#define PCMOUT_LOW_WM (PCMOUT_BUFSIZE/16)
#define PCMOUT_EMPTY_WM (0)
struct pcm_frame_header /* Header added to pcm data every time a decoded
audio frame is sent out */
{
uint32_t size; /* size of this frame - including header */
unsigned char data[]; /* open array of audio data */
} ALIGNED_ATTR(4);
bool pcm_output_init(void *mem, size_t *size);
void pcm_output_exit(void);
void pcm_output_flush(void);
void pcm_output_play_pause(bool play);
void pcm_output_stop(void);
void pcm_output_drain(void);
void * pcm_output_get_buffer(ssize_t *size);
bool pcm_output_commit_data(ssize_t size);
bool pcm_output_empty(void);
#endif /* PCM_OUTPUT_H */
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