source: roaraudio/roard/include/output.h @ 5192:4237437ca526

//output.h:

/*
 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011
 *
 *  This file is part of roard a part of RoarAudio,
 *  a cross-platform sound system for both, home and professional use.
 *  See README for details.
 *
 *  This file is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 3
 *  as published by the Free Software Foundation.
 *
 *  RoarAudio 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 software; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#ifndef _OUTPUT_H_
#define _OUTPUT_H_

#include <roaraudio.h>

// NOTE: we do not set ROAR_OUTPUT_BUFFER_SAMPLES depending on DEBUG anymore
//       as it caused a lot problems with partly enabled debugging

#ifdef ROAR_OUTPUT_CFREQ
#define ROAR_OUTPUT_BUFFER_SAMPLES (ROAR_RATE_DEFAULT/ROAR_OUTPUT_CFREQ)
#else
// in normal case we use 100 cycles per sec, as we do not know the sample
// rate at compile time we guess it's normaly the default rate.
// on OpenBSD we need to set a lower freq, use 20 cycles per sec here as
// it seems to work.
// FIXME: find out what the problem is and how to fix
#ifdef ROAR_OS_OPENBSD
#define ROAR_OUTPUT_BUFFER_SAMPLES (ROAR_RATE_DEFAULT/20)
#define ROAR_OUTPUT_CFREQ          20
#else
#define ROAR_OUTPUT_BUFFER_SAMPLES (ROAR_RATE_DEFAULT/100)
#define ROAR_OUTPUT_CFREQ          100
#endif

#endif

#define ROAR_OUTPUT_WRITE_SIZE     1024

//#define ROAR_OUTPUT_CALC_OUTBUFSIZE(x)   (ROAR_OUTPUT_BUFFER_SAMPLES * (x)->channels * ((x)->bits / 8) * ((float)(x)->rate/g_sa->rate))
// First rounds the samples count, and makes sure that the outbuffer size is divisible by the framesize (channels * bits/8)
#define ROAR_OUTPUT_CALC_OUTBUFSIZE(x)   ( \
                                          ( \
                                           (int)(ROAR_OUTPUT_BUFFER_SAMPLES * ((float)(x)->rate/g_sa->rate) + 0.5) \
                                          ) * \
                                          (x)->channels * ((x)->bits / 8) \
                                         )

#define ROAR_OUTPUT_CALC_OUTBUFSAMP(x,y) ((y) / ((x)->channels * ((x)->bits / 8)*((float)(x)->rate/g_sa->rate)))
#define ROAR_OUTPUT_CALC_OUTBUFSIZE_MAX(x0,x1)  (ROAR_OUTPUT_BUFFER_SAMPLES                                  * \
                                                  ROAR_MAX((x0)->channels,(x1)->channels)                    * \
                                                 (ROAR_MAX((x0)->bits,    (x1)->bits    ) / 8)               * \
                                                 (ROAR_MAX((float)(x0)->rate,(float)(x1)->rate)/g_sa->rate)    \
                                                )

extern void         * g_output_buffer;
extern void         * g_input_buffer;
extern size_t         g_output_buffer_len;
#define        g_input_buffer_len g_output_buffer_len

int output_buffer_init   (struct roar_audio_info * info);
int output_buffer_reinit (void);
int output_buffer_free   (void);

int output_add         (char * drv, char * dev, char * opts, int prim, int count);
int output_add_default (char * drv, char * dev, char * opts, int prim, int count);

#endif

//ll