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00001 /*
00002     synth_8bit.h: Wrappers over optimized synth_xtoy for converting signed short to 8bit.
00003 
00004     copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
00005     see COPYING and AUTHORS files in distribution or http://mpg123.org
00006     initially written by Michael Hipp, code generalized to the wrapper by Thomas Orgis
00007 
00008     Only variable is the BLOCK size to choose 1to1, 2to1 or 4to1.
00009     Oh, and the names: BASE_SYNTH_NAME, SYNTH_NAME, MONO_NAME, MONO2STEREO_NAME
00010     (p.ex. opt_synth_1to1(fr), synth_1to1_8bit, synth_1to1_8bit_mono, ...).
00011 */
00012 
00013 int SYNTH_NAME(real *bandPtr, int channel, mpg123_handle *fr, int final)
00014 {
00015     short samples_tmp[BLOCK];
00016     short *tmp1 = samples_tmp + channel;
00017     int i,ret;
00018 
00019     unsigned char *samples = fr->buffer.data;
00020     int pnt = fr->buffer.fill;
00021     fr->buffer.data = (unsigned char*) samples_tmp;
00022     fr->buffer.fill = 0;
00023     ret = BASE_SYNTH_NAME(bandPtr, channel, fr , 0);
00024     fr->buffer.data = samples;
00025 
00026     samples += channel + pnt;
00027     for(i=0;i<(BLOCK/2);i++)
00028     {
00029         *samples = fr->conv16to8[*tmp1>>AUSHIFT];
00030         samples += 2;
00031         tmp1 += 2;
00032     }
00033     fr->buffer.fill = pnt + (final ? BLOCK : 0 );
00034 
00035     return ret;
00036 }
00037 
00038 int MONO_NAME(real *bandPtr, mpg123_handle *fr)
00039 {
00040     short samples_tmp[BLOCK];
00041     short *tmp1 = samples_tmp;
00042     int i,ret;
00043  
00044     unsigned char *samples = fr->buffer.data;
00045     int pnt = fr->buffer.fill;
00046     fr->buffer.data = (unsigned char*) samples_tmp;
00047     fr->buffer.fill = 0;
00048     ret = BASE_SYNTH_NAME(bandPtr, 0, fr, 0);
00049     fr->buffer.data = samples;
00050 
00051     samples += pnt;
00052     for(i=0;i<(BLOCK/2);i++)
00053     {
00054         *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
00055         tmp1+=2;
00056     }
00057     fr->buffer.fill = pnt + BLOCK/2;
00058 
00059     return ret;
00060 }
00061 
00062 int MONO2STEREO_NAME(real *bandPtr, mpg123_handle *fr)
00063 {
00064     short samples_tmp[BLOCK];
00065     short *tmp1 = samples_tmp;
00066     int i,ret;
00067 
00068     unsigned char *samples = fr->buffer.data;
00069     int pnt = fr->buffer.fill;
00070     fr->buffer.data = (unsigned char*) samples_tmp;
00071     fr->buffer.fill = 0;
00072     ret = BASE_SYNTH_NAME(bandPtr, 0, fr, 0);
00073     fr->buffer.data = samples;
00074 
00075     samples += pnt;
00076     for(i=0;i<(BLOCK/2);i++)
00077     {
00078         *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
00079         *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
00080         tmp1 += 2;
00081     }
00082     fr->buffer.fill = pnt + BLOCK;
00083 
00084     return ret;
00085 }
00086
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