/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: http://www.musicpd.org
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef OUTPUT_BUFFER_H
#define OUTPUT_BUFFER_H
#include "pcm_utils.h"
#include "mpd_types.h"
#include "decode.h"
#include "audio.h"
#include "inputStream.h"
#include "replayGain.h"
#define OUTPUT_BUFFER_DC_STOP -1
#define OUTPUT_BUFFER_DC_SEEK -2
/* pick 1020 since its devisible for 8,16,24, and 32-bit audio */
#define CHUNK_SIZE 1020
typedef struct _OutputBufferChunk {
volatile mpd_uint16 chunkSize;
volatile mpd_uint16 bitRate;
volatile float times;
char data[CHUNK_SIZE];
} OutputBufferChunk;
/**
* A ring set of buffers where the decoder appends data after the end,
* and the player consumes data from the beginning.
*/
typedef struct _OutputBuffer {
OutputBufferChunk *chunks;
unsigned int size;
/** the index of the first decoded chunk */
mpd_uint16 volatile begin;
/** the index after the last decoded chunk */
mpd_uint16 volatile end;
mpd_sint16 currentChunk;
AudioFormat audioFormat;
ConvState convState;
} OutputBuffer;
void initOutputBuffer(OutputBuffer * cb, unsigned int size);
void clearOutputBuffer(OutputBuffer * cb);
void flushOutputBuffer(OutputBuffer * cb);
/** is the buffer empty? */
int outputBufferEmpty(const OutputBuffer * cb);
void outputBufferShift(OutputBuffer * cb);
/**
* what is the position of the specified chunk number, relative to
* the first chunk in use?
*/
unsigned int outputBufferRelative(const OutputBuffer * cb, unsigned i);
/** determine the number of decoded chunks */
unsigned availableOutputBuffer(const OutputBuffer * cb);
/**
* Get the absolute index of the nth used chunk after the first one.
* Returns -1 if there is no such chunk.
*/
int outputBufferAbsolute(const OutputBuffer * cb, unsigned relative);
OutputBufferChunk * outputBufferGetChunk(const OutputBuffer * cb, unsigned i);
/* we send inStream for buffering the inputStream while waiting to
send the next chunk */
int sendDataToOutputBuffer(OutputBuffer * cb,
InputStream * inStream,
DecoderControl * dc,
int seekable,
void *data,
size_t datalen,
float data_time,
mpd_uint16 bitRate, ReplayGainInfo * replayGainInfo);
#endif
