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Diffstat (limited to 'src/libs/sound/mixer/mixerint.h')
| -rw-r--r-- | src/libs/sound/mixer/mixerint.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/libs/sound/mixer/mixerint.h b/src/libs/sound/mixer/mixerint.h new file mode 100644 index 0000000..0605161 --- /dev/null +++ b/src/libs/sound/mixer/mixerint.h @@ -0,0 +1,110 @@ +/* + * 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_ */ |