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wine-mirror
GitHub Repository: wine-mirror/wine
 Path: blob/master/libs/mpg123/src/libmpg123/synth_8bit.h
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/*

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	synth_8bit.h: Wrappers over optimized synth_xtoy for converting signed short to 8bit.

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	copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1

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	see COPYING and AUTHORS files in distribution or http://mpg123.org

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	initially written by Michael Hipp, code generalized to the wrapper by Thomas Orgis

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	Only variable is the BLOCK size to choose 1to1, 2to1 or 4to1.

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	Oh, and the names: BASE_SYNTH_NAME, SYNTH_NAME, MONO_NAME, MONO2STEREO_NAME

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	(p.ex. opt_synth_1to1(fr), INT123_synth_1to1_8bit, INT123_synth_1to1_8bit_mono, ...).

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*/

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int SYNTH_NAME(real *bandPtr, int channel, mpg123_handle *fr, int final)

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{

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	short samples_tmp[BLOCK];

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	short *tmp1 = samples_tmp + channel;

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	int i,ret;

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	unsigned char *samples = fr->buffer.data;

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	int pnt = fr->buffer.fill;

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	fr->buffer.data = (unsigned char*) samples_tmp;

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	fr->buffer.fill = 0;

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	ret = BASE_SYNTH_NAME(bandPtr, channel, fr , 0);

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	fr->buffer.data = samples;

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	samples += channel + pnt;

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	for(i=0;i<(BLOCK/2);i++)

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	{

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		*samples = fr->conv16to8[*tmp1>>AUSHIFT];

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		samples += 2;

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		tmp1 += 2;

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	}

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	fr->buffer.fill = pnt + (final ? BLOCK : 0 );

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	return ret;

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}

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int MONO_NAME(real *bandPtr, mpg123_handle *fr)

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{

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	short samples_tmp[BLOCK];

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	short *tmp1 = samples_tmp;

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	int i,ret;

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	unsigned char *samples = fr->buffer.data;

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	int pnt = fr->buffer.fill;

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	fr->buffer.data = (unsigned char*) samples_tmp;

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	fr->buffer.fill = 0;

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	ret = BASE_SYNTH_NAME(bandPtr, 0, fr, 0);

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	fr->buffer.data = samples;

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	samples += pnt;

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	for(i=0;i<(BLOCK/2);i++)

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	{

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		*samples++ = fr->conv16to8[*tmp1>>AUSHIFT];

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		tmp1+=2;

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	}

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	fr->buffer.fill = pnt + BLOCK/2;

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	return ret;

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}

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int MONO2STEREO_NAME(real *bandPtr, mpg123_handle *fr)

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{

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	short samples_tmp[BLOCK];

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	short *tmp1 = samples_tmp;

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	int i,ret;

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	unsigned char *samples = fr->buffer.data;

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	int pnt = fr->buffer.fill;

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	fr->buffer.data = (unsigned char*) samples_tmp;

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	fr->buffer.fill = 0;

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	ret = BASE_SYNTH_NAME(bandPtr, 0, fr, 0);

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	fr->buffer.data = samples;

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	samples += pnt;

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	for(i=0;i<(BLOCK/2);i++)

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	{

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		*samples++ = fr->conv16to8[*tmp1>>AUSHIFT];

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		*samples++ = fr->conv16to8[*tmp1>>AUSHIFT];

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		tmp1 += 2;

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	}

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	fr->buffer.fill = pnt + BLOCK;

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	return ret;

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}

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