87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
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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), synth_1to1_8bit, 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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