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/*
* 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.
*/
/* Mixer for low-level sound output drivers
* Internals
*/
#ifndef LIBS_SOUND_MIXER_MIXERINT_H_
#define LIBS_SOUND_MIXER_MIXERINT_H_
#include "port.h"
#include "types.h"
/*************************************************
* Internals
*/
/* Conversion info types and funcs */
typedef enum
{
mixConvNone = 0,
mixConvStereoUp = 1,
mixConvStereoDown = 2,
mixConvSizeUp = 4,
mixConvSizeDown = 8
} mixer_ConvFlags;
typedef struct
{
uint32 srcfmt;
void *srcdata;
uint32 srcsize;
uint32 srcbpc; /* bytes/sample for 1 chan */
uint32 srcchans;
uint32 srcsamples;
uint32 dstfmt;
void *dstdata;
uint32 dstsize;
uint32 dstbpc; /* bytes/sample for 1 chan */
uint32 dstchans;
uint32 dstsamples;
mixer_ConvFlags flags;
} mixer_Convertion;
typedef struct
{
float (* Upsample) (mixer_Source *src, bool left);
float (* Downsample) (mixer_Source *src, bool left);
float (* None) (mixer_Source *src, bool left);
} mixer_Resampling;
static void mixer_ConvertBuffer_internal (mixer_Convertion *conv);
static void mixer_ResampleFlat (mixer_Convertion *conv);
static inline sint32 mixer_GetSampleExt (void *src, uint32 bpc);
static inline sint32 mixer_GetSampleInt (void *src, uint32 bpc);
static inline void mixer_PutSampleInt (void *dst, uint32 bpc,
sint32 samp);
static inline void mixer_PutSampleExt (void *dst, uint32 bpc,
sint32 samp);
static float mixer_ResampleNone (mixer_Source *src, bool left);
static float mixer_ResampleNearest (mixer_Source *src, bool left);
static float mixer_UpsampleLinear (mixer_Source *src, bool left);
static float mixer_UpsampleCubic (mixer_Source *src, bool left);
/* Source manipulation */
static void mixer_SourceUnqueueAll (mixer_Source *src);
static void mixer_SourceStop_internal (mixer_Source *src);
static void mixer_SourceRewind_internal (mixer_Source *src);
static void mixer_SourceActivate (mixer_Source* src);
static void mixer_SourceDeactivate (mixer_Source* src);
static inline bool mixer_CheckBufferState (mixer_Buffer *buf,
const char* FuncName);
/* Clipping boundaries */
#define MIX_S16_MAX ((float) SINT16_MAX)
#define MIX_S16_MIN ((float) SINT16_MIN)
#define MIX_S8_MAX ((float) SINT8_MAX)
#define MIX_S8_MIN ((float) SINT8_MIN)
/* Channel gain adjustment for clipping reduction */
#define MIX_GAIN_ADJ (0.75f)
/* The Mixer */
static inline bool mixer_SourceGetNextSample (mixer_Source *src,
float *psamp, bool left);
static inline bool mixer_SourceGetFakeSample (mixer_Source *src,
float *psamp, bool left);
static inline uint32 mixer_SourceAdvance (mixer_Source *src, bool left);
#endif /* LIBS_SOUND_MIXER_MIXERINT_H_ */
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