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142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
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synth_8bit.c: The functions for synthesizing 8bit samples, at the end of decoding.
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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, heavily dissected and rearranged by Thomas Orgis
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*/
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#include "mpg123lib_intern.h"
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#include "sample.h"
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#include "debug.h"
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/*
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Part 2: All synth functions that produce 8bit output.
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What we need is just a special WRITE_SAMPLE. For the generic and i386 functions, that is.
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For the rather optimized synth_1to1, we will need the postprocessing 8bit converters from synth_8bit.h .
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*/
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#define SAMPLE_T unsigned char
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#define WRITE_SAMPLE(samples,sum,clip) WRITE_8BIT_SAMPLE(samples,sum,clip)
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/* Part 2a: All straight 1to1 decoding functions */
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#define BLOCK 0x40 /* One decoding block is 64 samples. */
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#define SYNTH_NAME synth_1to1_8bit
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#include "synth.h"
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#undef SYNTH_NAME
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/* Mono-related synths; they wrap over _some_ synth_1to1_8bit (could be generic, could be i386). */
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#define SYNTH_NAME fr->synths.plain[r_1to1][f_8]
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#define MONO_NAME synth_1to1_8bit_mono
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#define MONO2STEREO_NAME synth_1to1_8bit_mono2stereo
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#include "synth_mono.h"
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#undef SYNTH_NAME
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#undef MONO_NAME
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#undef MONO2STEREO_NAME
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#ifdef OPT_X86
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#define NO_AUTOINCREMENT
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#define SYNTH_NAME synth_1to1_8bit_i386
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#include "synth.h"
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#undef SYNTH_NAME
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/* i386 uses the normal mono functions. */
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#undef NO_AUTOINCREMENT
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#endif
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/* But now, we need functions that take the 16bit output of optimized synth_1to1 and convert it.
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I suppose that is still faster than dropping the optimization altogether! */
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#define BASE_SYNTH_NAME fr->synths.plain[r_1to1][f_16]
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#define SYNTH_NAME synth_1to1_8bit_wrap
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#define MONO_NAME synth_1to1_8bit_wrap_mono
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#define MONO2STEREO_NAME synth_1to1_8bit_wrap_mono2stereo
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#include "synth_8bit.h"
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#undef BASE_SYNTH_NAME
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#undef SYNTH_NAME
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#undef MONO_NAME
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#undef MONO2STEREO_NAME
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#undef BLOCK
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#ifndef NO_DOWNSAMPLE
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/*
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Part 2b: 2to1 synth. Only generic and i386.
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*/
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#define BLOCK 0x20 /* One decoding block is 32 samples. */
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#define SYNTH_NAME synth_2to1_8bit
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#include "synth.h"
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#undef SYNTH_NAME
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/* Mono-related synths; they wrap over _some_ synth_2to1_8bit (could be generic, could be i386). */
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#define SYNTH_NAME fr->synths.plain[r_2to1][f_8]
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#define MONO_NAME synth_2to1_8bit_mono
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#define MONO2STEREO_NAME synth_2to1_8bit_mono2stereo
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#include "synth_mono.h"
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#undef SYNTH_NAME
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#undef MONO_NAME
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#undef MONO2STEREO_NAME
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#ifdef OPT_X86
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#define NO_AUTOINCREMENT
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#define SYNTH_NAME synth_2to1_8bit_i386
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#include "synth.h"
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#undef SYNTH_NAME
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/* i386 uses the normal mono functions. */
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#undef NO_AUTOINCREMENT
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#endif
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#undef BLOCK
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/*
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Part 2c: 4to1 synth. Only generic and i386.
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*/
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#define BLOCK 0x10 /* One decoding block is 16 samples. */
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#define SYNTH_NAME synth_4to1_8bit
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#include "synth.h"
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#undef SYNTH_NAME
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/* Mono-related synths; they wrap over _some_ synth_4to1_8bit (could be generic, could be i386). */
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#define SYNTH_NAME fr->synths.plain[r_4to1][f_8]
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#define MONO_NAME synth_4to1_8bit_mono
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#define MONO2STEREO_NAME synth_4to1_8bit_mono2stereo
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#include "synth_mono.h"
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#undef SYNTH_NAME
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#undef MONO_NAME
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#undef MONO2STEREO_NAME
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#ifdef OPT_X86
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#define NO_AUTOINCREMENT
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#define SYNTH_NAME synth_4to1_8bit_i386
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#include "synth.h"
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#undef SYNTH_NAME
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/* i386 uses the normal mono functions. */
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#undef NO_AUTOINCREMENT
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#endif
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#undef BLOCK
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#endif /* NO_DOWNSAMPLE */
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#ifndef NO_NTOM
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/*
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Part 2d: ntom synth.
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Same procedure as above... Just no extra play anymore, straight synth that may use an optimized dct64.
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*/
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/* These are all in one header, there's no flexibility to gain. */
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#define SYNTH_NAME synth_ntom_8bit
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#define MONO_NAME synth_ntom_8bit_mono
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#define MONO2STEREO_NAME synth_ntom_8bit_mono2stereo
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#include "synth_ntom.h"
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#undef SYNTH_NAME
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#undef MONO_NAME
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#undef MONO2STEREO_NAME
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#endif
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#undef SAMPLE_T
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#undef WRITE_SAMPLE
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