Initial commit of mpg123-1.29.3
This commit is contained in:
Sam Lantinga
776
src/libmpg123/format.c
Normal file
776
src/libmpg123/format.c
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@@ -0,0 +1,776 @@
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/*
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format: routines to deal with audio (output) format
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copyright 2008-20 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 Thomas Orgis, starting with parts of the old audio.c, with only faintly manage to show now
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A Major change from mpg123 <= 1.18 is that all encodings are only really
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disabled when done so via specific build configuration. Otherwise, the
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missing support of decoders to produce a certain format is augmented by
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postprocessing that converts the samples. This means happily creating
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data with higher resolution from less accurate decoder output.
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The main point is to still offer float encoding when the decoding core uses
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a fixed point representation that has only 16 bit output. Actually, that's
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the only point: A fixed-point build needs to create float from 16 bit, also
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32 or 24 bit from the same source. That's all there is to it: Everything else
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is covered by fallback synth functions. It may be a further step to check if
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there are cases where conversion in postprocessing works well enough to omit
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a certain specialized decoder ... but usually, they are justified by some
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special way to get from float to integer to begin with.
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I won't cover the case of faking double output with float/s16 decoders here.
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Double precision output is a thing for experimental builds anyway. Mostly
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theoretical and without a point.
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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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/* static int chans[NUM_CHANNELS] = { 1 , 2 }; */
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static const long my_rates[MPG123_RATES] = /* only the standard rates */
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{
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8000, 11025, 12000,
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16000, 22050, 24000,
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32000, 44100, 48000,
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};
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static const int my_encodings[MPG123_ENCODINGS] =
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{
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MPG123_ENC_SIGNED_16,
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MPG123_ENC_UNSIGNED_16,
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MPG123_ENC_SIGNED_32,
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MPG123_ENC_UNSIGNED_32,
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MPG123_ENC_SIGNED_24,
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MPG123_ENC_UNSIGNED_24,
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/* Floating point range, see below. */
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MPG123_ENC_FLOAT_32,
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MPG123_ENC_FLOAT_64,
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/* 8 bit range, see below. */
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MPG123_ENC_SIGNED_8,
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MPG123_ENC_UNSIGNED_8,
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MPG123_ENC_ULAW_8,
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MPG123_ENC_ALAW_8
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};
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/* Make that match the above table.
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And yes, I still don't like this kludgy stuff. */
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/* range[0] <= i < range[1] for forced floating point */
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static const int enc_float_range[2] = { 6, 8 };
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/* same for 8 bit encodings */
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static const int enc_8bit_range[2] = { 8, 12 };
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// for 24 bit quality (24 and 32 bit integers)
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static const int enc_24bit_range[2] = { 2, 6 };
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// for completeness, the 16 bits
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static const int enc_16bit_range[2] = { 0, 2};
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/*
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Only one type of float is supported.
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Actually, double is a very special experimental case not occuring in normal
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builds. Might actually get rid of it.
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Remember here: Also with REAL_IS_FIXED, I want to be able to produce float
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output (f32) via post-processing.
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*/
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# ifdef REAL_IS_DOUBLE
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# define MPG123_FLOAT_ENC MPG123_ENC_FLOAT_64
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# else
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# define MPG123_FLOAT_ENC MPG123_ENC_FLOAT_32
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# endif
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/* The list of actually possible encodings. */
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static const int good_encodings[] =
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{
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#ifndef NO_16BIT
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MPG123_ENC_SIGNED_16,
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MPG123_ENC_UNSIGNED_16,
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#endif
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#ifndef NO_32BIT
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MPG123_ENC_SIGNED_32,
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MPG123_ENC_UNSIGNED_32,
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MPG123_ENC_SIGNED_24,
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MPG123_ENC_UNSIGNED_24,
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#endif
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#ifndef NO_REAL
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MPG123_FLOAT_ENC,
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#endif
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#ifndef NO_8BIT
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MPG123_ENC_SIGNED_8,
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MPG123_ENC_UNSIGNED_8,
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MPG123_ENC_ULAW_8,
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MPG123_ENC_ALAW_8
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#endif
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};
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/* Check if encoding is a valid one in this build.
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...lazy programming: linear search. */
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static int good_enc(const int enc)
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{
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size_t i;
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for(i=0; i<sizeof(good_encodings)/sizeof(int); ++i)
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if(enc == good_encodings[i]) return TRUE;
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return FALSE;
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}
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void attribute_align_arg mpg123_rates(const long **list, size_t *number)
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{
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if(list != NULL) *list = my_rates;
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if(number != NULL) *number = sizeof(my_rates)/sizeof(long);
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}
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/* Now that's a bit tricky... One build of the library knows only a subset of the encodings. */
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void attribute_align_arg mpg123_encodings(const int **list, size_t *number)
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{
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if(list != NULL) *list = good_encodings;
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if(number != NULL) *number = sizeof(good_encodings)/sizeof(int);
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}
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int attribute_align_arg mpg123_encsize(int encoding)
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{
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return MPG123_SAMPLESIZE(encoding);
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}
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/* char audio_caps[NUM_CHANNELS][MPG123_RATES+1][MPG123_ENCODINGS]; */
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static int rate2num(mpg123_pars *mp, long r)
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{
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int i;
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for(i=0;i<MPG123_RATES;i++) if(my_rates[i] == r) return i;
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#ifndef NO_NTOM
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if(mp && mp->force_rate != 0 && mp->force_rate == r) return MPG123_RATES;
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#endif
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return -1;
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}
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static int enc2num(int encoding)
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{
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int i;
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for(i=0;i<MPG123_ENCODINGS;++i)
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if(my_encodings[i] == encoding) return i;
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return -1;
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}
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static int cap_fit(mpg123_pars *p, struct audioformat *nf, int f0, int f2)
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{
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int i;
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int c = nf->channels-1;
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int rn = rate2num(p, nf->rate);
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if(rn >= 0) for(i=f0;i<f2;i++)
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{
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if(p->audio_caps[c][rn][i])
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{
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nf->encoding = my_encodings[i];
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return 1;
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}
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}
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return 0;
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}
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static int imin(int a, int b)
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{
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return a < b ? a : b;
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}
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static int imax(int a, int b)
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{
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return a > b ? a : b;
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}
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// Find a possible encoding with given rate and channel count,
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// try differing channel count, too.
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// This updates the given format and returns TRUE if an encoding
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// was found.
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static int enc_chan_fit( mpg123_pars *p, long rate, struct audioformat *nnf
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, int f0, int f2, int try_float )
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{
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#define ENCRANGE(range) imax(f0, range[0]), imin(f2, range[1])
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struct audioformat nf = *nnf;
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nf.rate = rate;
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if(cap_fit(p, &nf, ENCRANGE(enc_16bit_range)))
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goto eend;
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if(cap_fit(p, &nf, ENCRANGE(enc_24bit_range)))
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goto eend;
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if(try_float &&
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cap_fit(p, &nf, ENCRANGE(enc_float_range)))
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goto eend;
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if(cap_fit(p, &nf, ENCRANGE(enc_8bit_range)))
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goto eend;
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/* try again with different stereoness */
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if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1;
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else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2;
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if(cap_fit(p, &nf, ENCRANGE(enc_16bit_range)))
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goto eend;
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if(cap_fit(p, &nf, ENCRANGE(enc_24bit_range)))
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goto eend;
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if(try_float &&
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cap_fit(p, &nf, ENCRANGE(enc_float_range)))
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goto eend;
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if(cap_fit(p, &nf, ENCRANGE(enc_8bit_range)))
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goto eend;
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return FALSE;
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eend:
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*nnf = nf;
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return TRUE;
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#undef ENCRANGE
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}
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/* match constraints against supported audio formats, store possible setup in frame
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return: -1: error; 0: no format change; 1: format change */
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int frame_output_format(mpg123_handle *fr)
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{
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struct audioformat nf;
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int f0=0;
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int f2=MPG123_ENCODINGS+1; // Include all encodings by default.
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mpg123_pars *p = &fr->p;
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int try_float = (p->flags & MPG123_FLOAT_FALLBACK) ? 0 : 1;
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/* initialize new format, encoding comes later */
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nf.channels = fr->stereo;
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mdebug("native frame format: %d ch @ %ld Hz", fr->stereo, frame_freq(fr));
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// I intended the forcing stuff to be weaved into the format support table,
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// but this probably will never happen, as this would change library behaviour.
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// One could introduce an additional effective format table that takes for
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// forcings into account, but that would have to be updated on any flag
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// change. Tedious.
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if(p->flags & MPG123_FORCE_8BIT)
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{
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f0 = enc_8bit_range[0];
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f2 = enc_8bit_range[1];
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}
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if(p->flags & MPG123_FORCE_FLOAT)
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{
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try_float = 1;
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f0 = enc_float_range[0];
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f2 = enc_float_range[1];
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}
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/* force stereo is stronger */
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if(p->flags & MPG123_FORCE_MONO) nf.channels = 1;
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if(p->flags & MPG123_FORCE_STEREO) nf.channels = 2;
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// Strategy update: Avoid too early triggering of the NtoM decoder.
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// Main target is the native rate, with any encoding.
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// Then, native rate with any channel count and any encoding.
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// Then, it's down_sample from native rate.
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// As last resort: NtoM rate.
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// So the priority is 1. rate 2. channels 3. encoding.
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// As encodings go, 16 bit is tranditionally preferred as efficient choice.
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// Next in line are wider float and integer encodings, then 8 bit as
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// last resort.
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#ifndef NO_NTOM
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if(p->force_rate)
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{
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if(enc_chan_fit(p, p->force_rate, &nf, f0, f2, try_float))
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goto end;
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// Keep the order consistent if float is considered fallback only.
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if(!try_float &&
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enc_chan_fit(p, p->force_rate, &nf, f0, f2, TRUE))
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goto end;
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merror( "Unable to set up output format! Constraints: %s%s%liHz."
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, ( p->flags & MPG123_FORCE_STEREO ? "stereo, " :
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(p->flags & MPG123_FORCE_MONO ? "mono, " : "") )
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, ( p->flags & MPG123_FORCE_FLOAT ? "float, " :
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(p->flags & MPG123_FORCE_8BIT ? "8bit, " : "") )
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, p->force_rate );
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/* if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */
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fr->err = MPG123_BAD_OUTFORMAT;
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return -1;
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}
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#endif
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// Native decoder rate first.
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if(enc_chan_fit(p, frame_freq(fr)>>p->down_sample, &nf, f0, f2, try_float))
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goto end;
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// Then downsamplings.
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if(p->flags & MPG123_AUTO_RESAMPLE && p->down_sample < 2)
|
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{
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||||
if(enc_chan_fit( p, frame_freq(fr)>>(p->down_sample+1), &nf
|
||||
, f0, f2, try_float ))
|
||||
goto end;
|
||||
if(p->down_sample < 1 && enc_chan_fit( p, frame_freq(fr)>>2, &nf
|
||||
, f0, f2, try_float ))
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||||
goto end;
|
||||
}
|
||||
// And again the whole deal with float fallback.
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||||
if(!try_float)
|
||||
{
|
||||
if(enc_chan_fit(p, frame_freq(fr)>>p->down_sample, &nf, f0, f2, TRUE))
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goto end;
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||||
// Then downsamplings.
|
||||
if(p->flags & MPG123_AUTO_RESAMPLE && p->down_sample < 2)
|
||||
{
|
||||
if(enc_chan_fit( p, frame_freq(fr)>>(p->down_sample+1), &nf
|
||||
, f0, f2, TRUE ))
|
||||
goto end;
|
||||
if(p->down_sample < 1 && enc_chan_fit( p, frame_freq(fr)>>2, &nf
|
||||
, f0, f2, TRUE ))
|
||||
goto end;
|
||||
}
|
||||
}
|
||||
#ifndef NO_NTOM
|
||||
// Try to find any rate that works and resample using NtoM hackery.
|
||||
if( p->flags & MPG123_AUTO_RESAMPLE && fr->p.down_sample == 0)
|
||||
{
|
||||
int i;
|
||||
int rn = rate2num(p, frame_freq(fr));
|
||||
int rrn;
|
||||
if(rn < 0) return 0;
|
||||
/* Try higher rates first. */
|
||||
for(rrn=rn+1; rrn<MPG123_RATES; ++rrn)
|
||||
if(enc_chan_fit(p, my_rates[rrn], &nf, f0, f2, try_float))
|
||||
goto end;
|
||||
/* Then lower rates. */
|
||||
for(i=f0;i<f2;i++) for(rrn=rn-1; rrn>=0; --rrn)
|
||||
if(enc_chan_fit(p, my_rates[rrn], &nf, f0, f2, try_float))
|
||||
goto end;
|
||||
// And again for float fallback.
|
||||
if(!try_float)
|
||||
{
|
||||
/* Try higher rates first. */
|
||||
for(rrn=rn+1; rrn<MPG123_RATES; ++rrn)
|
||||
if(enc_chan_fit(p, my_rates[rrn], &nf, f0, f2, TRUE))
|
||||
goto end;
|
||||
/* Then lower rates. */
|
||||
for(i=f0;i<f2;i++) for(rrn=rn-1; rrn>=0; --rrn)
|
||||
if(enc_chan_fit(p, my_rates[rrn], &nf, f0, f2, TRUE))
|
||||
goto end;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Here is the _bad_ end. */
|
||||
merror( "Unable to set up output format! Constraints: %s%s%li, %li or %liHz."
|
||||
, ( p->flags & MPG123_FORCE_STEREO ? "stereo, " :
|
||||
(p->flags & MPG123_FORCE_MONO ? "mono, " : "") )
|
||||
, ( p->flags & MPG123_FORCE_FLOAT ? "float, " :
|
||||
(p->flags & MPG123_FORCE_8BIT ? "8bit, " : "") )
|
||||
, frame_freq(fr)>>p->down_sample
|
||||
, frame_freq(fr)>>(p->down_sample ? p->down_sample : 1)
|
||||
, frame_freq(fr)>>2 );
|
||||
/* if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */
|
||||
|
||||
fr->err = MPG123_BAD_OUTFORMAT;
|
||||
return -1;
|
||||
|
||||
end: /* Here is the _good_ end. */
|
||||
/* we had a successful match, now see if there's a change */
|
||||
if(nf.rate == fr->af.rate && nf.channels == fr->af.channels && nf.encoding == fr->af.encoding)
|
||||
{
|
||||
debug2("Old format with %i channels, and FORCE_MONO=%li", nf.channels, p->flags & MPG123_FORCE_MONO);
|
||||
return 0; /* the same format as before */
|
||||
}
|
||||
else /* a new format */
|
||||
{
|
||||
debug1("New format with %i channels!", nf.channels);
|
||||
fr->af.rate = nf.rate;
|
||||
fr->af.channels = nf.channels;
|
||||
fr->af.encoding = nf.encoding;
|
||||
/* Cache the size of one sample in bytes, for ease of use. */
|
||||
fr->af.encsize = mpg123_encsize(fr->af.encoding);
|
||||
if(fr->af.encsize < 1)
|
||||
{
|
||||
error1("Some unknown encoding??? (%i)", fr->af.encoding);
|
||||
|
||||
fr->err = MPG123_BAD_OUTFORMAT;
|
||||
return -1;
|
||||
}
|
||||
/* Set up the decoder synth format. Might differ. */
|
||||
#ifdef NO_SYNTH32
|
||||
/* Without high-precision synths, 16 bit signed is the basis for
|
||||
everything higher than 8 bit. */
|
||||
if(fr->af.encsize > 2)
|
||||
fr->af.dec_enc = MPG123_ENC_SIGNED_16;
|
||||
else
|
||||
{
|
||||
#endif
|
||||
switch(fr->af.encoding)
|
||||
{
|
||||
#ifndef NO_32BIT
|
||||
case MPG123_ENC_SIGNED_24:
|
||||
case MPG123_ENC_UNSIGNED_24:
|
||||
case MPG123_ENC_UNSIGNED_32:
|
||||
fr->af.dec_enc = MPG123_ENC_SIGNED_32;
|
||||
break;
|
||||
#endif
|
||||
#ifndef NO_16BIT
|
||||
case MPG123_ENC_UNSIGNED_16:
|
||||
fr->af.dec_enc = MPG123_ENC_SIGNED_16;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
fr->af.dec_enc = fr->af.encoding;
|
||||
}
|
||||
#ifdef NO_SYNTH32
|
||||
}
|
||||
#endif
|
||||
fr->af.dec_encsize = mpg123_encsize(fr->af.dec_enc);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
int attribute_align_arg mpg123_format_none(mpg123_handle *mh)
|
||||
{
|
||||
int r;
|
||||
if(mh == NULL) return MPG123_BAD_HANDLE;
|
||||
|
||||
r = mpg123_fmt_none(&mh->p);
|
||||
if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; }
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
int attribute_align_arg mpg123_fmt_none(mpg123_pars *mp)
|
||||
{
|
||||
if(mp == NULL) return MPG123_BAD_PARS;
|
||||
|
||||
if(PVERB(mp,3)) fprintf(stderr, "Note: Disabling all formats.\n");
|
||||
|
||||
memset(mp->audio_caps,0,sizeof(mp->audio_caps));
|
||||
return MPG123_OK;
|
||||
}
|
||||
|
||||
int attribute_align_arg mpg123_format_all(mpg123_handle *mh)
|
||||
{
|
||||
int r;
|
||||
if(mh == NULL) return MPG123_BAD_HANDLE;
|
||||
|
||||
r = mpg123_fmt_all(&mh->p);
|
||||
if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; }
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
int attribute_align_arg mpg123_fmt_all(mpg123_pars *mp)
|
||||
{
|
||||
size_t rate, ch, enc;
|
||||
if(mp == NULL) return MPG123_BAD_PARS;
|
||||
|
||||
if(PVERB(mp,3)) fprintf(stderr, "Note: Enabling all formats.\n");
|
||||
|
||||
for(ch=0; ch < NUM_CHANNELS; ++ch)
|
||||
for(rate=0; rate < MPG123_RATES+1; ++rate)
|
||||
for(enc=0; enc < MPG123_ENCODINGS; ++enc)
|
||||
mp->audio_caps[ch][rate][enc] = good_enc(my_encodings[enc]) ? 1 : 0;
|
||||
|
||||
return MPG123_OK;
|
||||
}
|
||||
|
||||
int attribute_align_arg mpg123_format2(mpg123_handle *mh, long rate, int channels, int encodings)
|
||||
{
|
||||
int r;
|
||||
if(mh == NULL) return MPG123_BAD_HANDLE;
|
||||
r = mpg123_fmt2(&mh->p, rate, channels, encodings);
|
||||
if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; }
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
// Keep old behaviour.
|
||||
int attribute_align_arg mpg123_format(mpg123_handle *mh, long rate, int channels, int encodings)
|
||||
{
|
||||
int r;
|
||||
if(mh == NULL) return MPG123_BAD_HANDLE;
|
||||
r = mpg123_fmt(&mh->p, rate, channels, encodings);
|
||||
if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; }
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
int attribute_align_arg mpg123_fmt2(mpg123_pars *mp, long rate, int channels, int encodings)
|
||||
{
|
||||
int ie, ic, ratei, r1, r2;
|
||||
int ch[2] = {0, 1};
|
||||
if(mp == NULL) return MPG123_BAD_PARS;
|
||||
if(!(channels & (MPG123_MONO|MPG123_STEREO))) return MPG123_BAD_CHANNEL;
|
||||
|
||||
if(PVERB(mp,3)) fprintf(stderr, "Note: Want to enable format %li/%i for encodings 0x%x.\n", rate, channels, encodings);
|
||||
|
||||
if(!(channels & MPG123_STEREO)) ch[1] = 0; /* {0,0} */
|
||||
else if(!(channels & MPG123_MONO)) ch[0] = 1; /* {1,1} */
|
||||
if(rate)
|
||||
{
|
||||
r1 = rate2num(mp, rate);
|
||||
r2 = r1+1;
|
||||
}
|
||||
else
|
||||
{
|
||||
r1 = 0;
|
||||
r2 = MPG123_RATES+1; /* including forced rate */
|
||||
}
|
||||
|
||||
if(r1 < 0) return MPG123_BAD_RATE;
|
||||
|
||||
/* now match the encodings */
|
||||
for(ratei = r1; ratei < r2; ++ratei)
|
||||
for(ic = 0; ic < 2; ++ic)
|
||||
{
|
||||
for(ie = 0; ie < MPG123_ENCODINGS; ++ie)
|
||||
if(good_enc(my_encodings[ie]) && ((my_encodings[ie] & encodings) == my_encodings[ie]))
|
||||
mp->audio_caps[ch[ic]][ratei][ie] = 1;
|
||||
|
||||
if(ch[0] == ch[1]) break; /* no need to do it again */
|
||||
}
|
||||
|
||||
return MPG123_OK;
|
||||
}
|
||||
|
||||
// Keep old behaviour, error on rate=0.
|
||||
int attribute_align_arg mpg123_fmt(mpg123_pars *mp, long rate, int channels, int encodings)
|
||||
{
|
||||
return (rate == 0)
|
||||
? MPG123_BAD_RATE
|
||||
: mpg123_fmt2(mp, rate, channels, encodings);
|
||||
}
|
||||
|
||||
int attribute_align_arg mpg123_format_support(mpg123_handle *mh, long rate, int encoding)
|
||||
{
|
||||
if(mh == NULL) return 0;
|
||||
else return mpg123_fmt_support(&mh->p, rate, encoding);
|
||||
}
|
||||
|
||||
int attribute_align_arg mpg123_fmt_support(mpg123_pars *mp, long rate, int encoding)
|
||||
{
|
||||
int ch = 0;
|
||||
int ratei, enci;
|
||||
ratei = rate2num(mp, rate);
|
||||
enci = enc2num(encoding);
|
||||
if(mp == NULL || ratei < 0 || enci < 0) return 0;
|
||||
if(mp->audio_caps[0][ratei][enci]) ch |= MPG123_MONO;
|
||||
if(mp->audio_caps[1][ratei][enci]) ch |= MPG123_STEREO;
|
||||
return ch;
|
||||
}
|
||||
|
||||
/* Call this one to ensure that any valid format will be something different than this. */
|
||||
void invalidate_format(struct audioformat *af)
|
||||
{
|
||||
af->encoding = 0;
|
||||
af->rate = 0;
|
||||
af->channels = 0;
|
||||
}
|
||||
|
||||
/* Number of bytes the decoder produces. */
|
||||
off_t decoder_synth_bytes(mpg123_handle *fr, off_t s)
|
||||
{
|
||||
return s * fr->af.dec_encsize * fr->af.channels;
|
||||
}
|
||||
|
||||
/* Samples/bytes for output buffer after post-processing. */
|
||||
/* take into account: channels, bytes per sample -- NOT resampling!*/
|
||||
off_t samples_to_bytes(mpg123_handle *fr , off_t s)
|
||||
{
|
||||
return s * fr->af.encsize * fr->af.channels;
|
||||
}
|
||||
|
||||
off_t bytes_to_samples(mpg123_handle *fr , off_t b)
|
||||
{
|
||||
return b / fr->af.encsize / fr->af.channels;
|
||||
}
|
||||
|
||||
/* Number of bytes needed for decoding _and_ post-processing. */
|
||||
off_t outblock_bytes(mpg123_handle *fr, off_t s)
|
||||
{
|
||||
int encsize = (fr->af.encoding & MPG123_ENC_24)
|
||||
? 4 /* Intermediate 32 bit. */
|
||||
: (fr->af.encsize > fr->af.dec_encsize
|
||||
? fr->af.encsize
|
||||
: fr->af.dec_encsize);
|
||||
return s * encsize * fr->af.channels;
|
||||
}
|
||||
|
||||
#ifndef NO_32BIT
|
||||
|
||||
/* Remove every fourth byte, facilitating conversion from 32 bit to 24 bit integers.
|
||||
This has to be aware of endianness, of course. */
|
||||
static void chop_fourth_byte(struct outbuffer *buf)
|
||||
{
|
||||
unsigned char *wpos = buf->data;
|
||||
unsigned char *rpos = buf->data;
|
||||
size_t blocks = buf->fill/4;
|
||||
size_t i;
|
||||
for(i=0; i<blocks; ++i,wpos+=3,rpos+=4)
|
||||
DROP4BYTE(wpos, rpos)
|
||||
buf->fill = wpos-buf->data;
|
||||
}
|
||||
|
||||
static void conv_s32_to_u32(struct outbuffer *buf)
|
||||
{
|
||||
size_t i;
|
||||
int32_t *ssamples = (int32_t*) buf->data;
|
||||
uint32_t *usamples = (uint32_t*) buf->data;
|
||||
size_t count = buf->fill/sizeof(int32_t);
|
||||
|
||||
for(i=0; i<count; ++i)
|
||||
usamples[i] = CONV_SU32(ssamples[i]);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
/* We always assume that whole numbers are written!
|
||||
partials will be cut out. */
|
||||
|
||||
static const char *bufsizeerr = "Fatal: Buffer too small for postprocessing!";
|
||||
|
||||
|
||||
#ifndef NO_16BIT
|
||||
|
||||
static void conv_s16_to_u16(struct outbuffer *buf)
|
||||
{
|
||||
size_t i;
|
||||
int16_t *ssamples = (int16_t*) buf->data;
|
||||
uint16_t *usamples = (uint16_t*)buf->data;
|
||||
size_t count = buf->fill/sizeof(int16_t);
|
||||
|
||||
for(i=0; i<count; ++i)
|
||||
usamples[i] = CONV_SU16(ssamples[i]);
|
||||
}
|
||||
|
||||
#ifndef NO_REAL
|
||||
static void conv_s16_to_f32(struct outbuffer *buf)
|
||||
{
|
||||
ssize_t i;
|
||||
int16_t *in = (int16_t*) buf->data;
|
||||
float *out = (float*) buf->data;
|
||||
size_t count = buf->fill/sizeof(int16_t);
|
||||
/* Does that make any sense? In x86, there is an actual instruction to divide
|
||||
float by integer ... but then, if we have that FPU, we don't really need
|
||||
fixed point decoder hacks ...? */
|
||||
float scale = 1./SHORT_SCALE;
|
||||
|
||||
if(buf->size < count*sizeof(float))
|
||||
{
|
||||
error1("%s", bufsizeerr);
|
||||
return;
|
||||
}
|
||||
|
||||
/* Work from the back since output is bigger. */
|
||||
for(i=count-1; i>=0; --i)
|
||||
out[i] = (float)in[i] * scale;
|
||||
|
||||
buf->fill = count*sizeof(float);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef NO_32BIT
|
||||
static void conv_s16_to_s32(struct outbuffer *buf)
|
||||
{
|
||||
ssize_t i;
|
||||
int16_t *in = (int16_t*) buf->data;
|
||||
int32_t *out = (int32_t*) buf->data;
|
||||
size_t count = buf->fill/sizeof(int16_t);
|
||||
|
||||
if(buf->size < count*sizeof(int32_t))
|
||||
{
|
||||
error1("%s", bufsizeerr);
|
||||
return;
|
||||
}
|
||||
|
||||
/* Work from the back since output is bigger. */
|
||||
for(i=count-1; i>=0; --i)
|
||||
{
|
||||
out[i] = in[i];
|
||||
/* Could just shift bytes, but would have to mess with sign bit. */
|
||||
out[i] *= S32_RESCALE;
|
||||
}
|
||||
|
||||
buf->fill = count*sizeof(int32_t);
|
||||
}
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#include "swap_bytes_impl.h"
|
||||
|
||||
void swap_endian(struct outbuffer *buf, int block)
|
||||
{
|
||||
size_t count;
|
||||
|
||||
if(block >= 2)
|
||||
{
|
||||
count = buf->fill/(unsigned int)block;
|
||||
swap_bytes(buf->data, (size_t)block, count);
|
||||
}
|
||||
}
|
||||
|
||||
void postprocess_buffer(mpg123_handle *fr)
|
||||
{
|
||||
/*
|
||||
This caters for the final output formats that are never produced by
|
||||
decoder synth directly (wide unsigned and 24 bit formats) or that are
|
||||
missing because of limited decoder precision (16 bit synth but 32 or
|
||||
24 bit output).
|
||||
*/
|
||||
switch(fr->af.dec_enc)
|
||||
{
|
||||
#ifndef NO_32BIT
|
||||
case MPG123_ENC_SIGNED_32:
|
||||
switch(fr->af.encoding)
|
||||
{
|
||||
case MPG123_ENC_UNSIGNED_32:
|
||||
conv_s32_to_u32(&fr->buffer);
|
||||
break;
|
||||
case MPG123_ENC_UNSIGNED_24:
|
||||
conv_s32_to_u32(&fr->buffer);
|
||||
chop_fourth_byte(&fr->buffer);
|
||||
break;
|
||||
case MPG123_ENC_SIGNED_24:
|
||||
chop_fourth_byte(&fr->buffer);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
#endif
|
||||
#ifndef NO_16BIT
|
||||
case MPG123_ENC_SIGNED_16:
|
||||
switch(fr->af.encoding)
|
||||
{
|
||||
case MPG123_ENC_UNSIGNED_16:
|
||||
conv_s16_to_u16(&fr->buffer);
|
||||
break;
|
||||
#ifndef NO_REAL
|
||||
case MPG123_ENC_FLOAT_32:
|
||||
conv_s16_to_f32(&fr->buffer);
|
||||
break;
|
||||
#endif
|
||||
#ifndef NO_32BIT
|
||||
case MPG123_ENC_SIGNED_32:
|
||||
conv_s16_to_s32(&fr->buffer);
|
||||
break;
|
||||
case MPG123_ENC_UNSIGNED_32:
|
||||
conv_s16_to_s32(&fr->buffer);
|
||||
conv_s32_to_u32(&fr->buffer);
|
||||
break;
|
||||
case MPG123_ENC_UNSIGNED_24:
|
||||
conv_s16_to_s32(&fr->buffer);
|
||||
conv_s32_to_u32(&fr->buffer);
|
||||
chop_fourth_byte(&fr->buffer);
|
||||
break;
|
||||
case MPG123_ENC_SIGNED_24:
|
||||
conv_s16_to_s32(&fr->buffer);
|
||||
chop_fourth_byte(&fr->buffer);
|
||||
break;
|
||||
#endif
|
||||
}
|
||||
break;
|
||||
#endif
|
||||
}
|
||||
if(fr->p.flags & MPG123_FORCE_ENDIAN)
|
||||
{
|
||||
if(
|
||||
#ifdef WORDS_BIGENDIAN
|
||||
!(
|
||||
#endif
|
||||
fr->p.flags & MPG123_BIG_ENDIAN
|
||||
#ifdef WORDS_BIGENDIAN
|
||||
)
|
||||
#endif
|
||||
)
|
||||
swap_endian(&fr->buffer, mpg123_encsize(fr->af.encoding));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user