4ede311055
Audio notes (opus codec) A lot of different improvements and bug fixes Thanks to: https://github.com/DrKLO/Telegram/issues/293 https://github.com/DrKLO/Telegram/issues/256 FOSS configuration not ready yet I will move main dev branch to github in next couple commits
224 lines
5.9 KiB
C
224 lines
5.9 KiB
C
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2010 Xiph.Org Foundation
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Copyright (c) 2008 Gregory Maxwell
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Written by Jean-Marc Valin and Gregory Maxwell */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#define CELT_C
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#include "os_support.h"
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#include "mdct.h"
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#include <math.h>
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#include "celt.h"
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#include "pitch.h"
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#include "bands.h"
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#include "modes.h"
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#include "entcode.h"
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#include "quant_bands.h"
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#include "rate.h"
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#include "stack_alloc.h"
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#include "mathops.h"
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#include "float_cast.h"
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#include <stdarg.h>
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#include "celt_lpc.h"
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#include "vq.h"
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#ifndef PACKAGE_VERSION
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#define PACKAGE_VERSION "unknown"
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#endif
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int resampling_factor(opus_int32 rate)
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{
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int ret;
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switch (rate)
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{
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case 48000:
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ret = 1;
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break;
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case 24000:
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ret = 2;
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break;
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case 16000:
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ret = 3;
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break;
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case 12000:
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ret = 4;
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break;
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case 8000:
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ret = 6;
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break;
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default:
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#ifndef CUSTOM_MODES
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celt_assert(0);
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#endif
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ret = 0;
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break;
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}
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return ret;
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}
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#ifndef OVERRIDE_COMB_FILTER_CONST
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static void comb_filter_const(opus_val32 *y, opus_val32 *x, int T, int N,
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opus_val16 g10, opus_val16 g11, opus_val16 g12)
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{
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opus_val32 x0, x1, x2, x3, x4;
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int i;
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x4 = x[-T-2];
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x3 = x[-T-1];
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x2 = x[-T];
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x1 = x[-T+1];
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for (i=0;i<N;i++)
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{
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x0=x[i-T+2];
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y[i] = x[i]
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+ MULT16_32_Q15(g10,x2)
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+ MULT16_32_Q15(g11,ADD32(x1,x3))
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+ MULT16_32_Q15(g12,ADD32(x0,x4));
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x4=x3;
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x3=x2;
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x2=x1;
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x1=x0;
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}
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}
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#endif
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void comb_filter(opus_val32 *y, opus_val32 *x, int T0, int T1, int N,
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opus_val16 g0, opus_val16 g1, int tapset0, int tapset1,
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const opus_val16 *window, int overlap)
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{
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int i;
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/* printf ("%d %d %f %f\n", T0, T1, g0, g1); */
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opus_val16 g00, g01, g02, g10, g11, g12;
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opus_val32 x0, x1, x2, x3, x4;
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static const opus_val16 gains[3][3] = {
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{QCONST16(0.3066406250f, 15), QCONST16(0.2170410156f, 15), QCONST16(0.1296386719f, 15)},
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{QCONST16(0.4638671875f, 15), QCONST16(0.2680664062f, 15), QCONST16(0.f, 15)},
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{QCONST16(0.7998046875f, 15), QCONST16(0.1000976562f, 15), QCONST16(0.f, 15)}};
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if (g0==0 && g1==0)
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{
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/* OPT: Happens to work without the OPUS_MOVE(), but only because the current encoder already copies x to y */
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if (x!=y)
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OPUS_MOVE(y, x, N);
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return;
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}
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g00 = MULT16_16_Q15(g0, gains[tapset0][0]);
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g01 = MULT16_16_Q15(g0, gains[tapset0][1]);
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g02 = MULT16_16_Q15(g0, gains[tapset0][2]);
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g10 = MULT16_16_Q15(g1, gains[tapset1][0]);
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g11 = MULT16_16_Q15(g1, gains[tapset1][1]);
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g12 = MULT16_16_Q15(g1, gains[tapset1][2]);
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x1 = x[-T1+1];
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x2 = x[-T1 ];
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x3 = x[-T1-1];
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x4 = x[-T1-2];
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for (i=0;i<overlap;i++)
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{
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opus_val16 f;
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x0=x[i-T1+2];
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f = MULT16_16_Q15(window[i],window[i]);
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y[i] = x[i]
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+ MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g00),x[i-T0])
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+ MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g01),ADD32(x[i-T0+1],x[i-T0-1]))
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+ MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g02),ADD32(x[i-T0+2],x[i-T0-2]))
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+ MULT16_32_Q15(MULT16_16_Q15(f,g10),x2)
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+ MULT16_32_Q15(MULT16_16_Q15(f,g11),ADD32(x1,x3))
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+ MULT16_32_Q15(MULT16_16_Q15(f,g12),ADD32(x0,x4));
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x4=x3;
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x3=x2;
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x2=x1;
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x1=x0;
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}
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if (g1==0)
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{
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/* OPT: Happens to work without the OPUS_MOVE(), but only because the current encoder already copies x to y */
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if (x!=y)
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OPUS_MOVE(y+overlap, x+overlap, N-overlap);
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return;
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}
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/* Compute the part with the constant filter. */
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comb_filter_const(y+i, x+i, T1, N-i, g10, g11, g12);
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}
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const signed char tf_select_table[4][8] = {
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{0, -1, 0, -1, 0,-1, 0,-1},
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{0, -1, 0, -2, 1, 0, 1,-1},
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{0, -2, 0, -3, 2, 0, 1,-1},
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{0, -2, 0, -3, 3, 0, 1,-1},
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};
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void init_caps(const CELTMode *m,int *cap,int LM,int C)
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{
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int i;
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for (i=0;i<m->nbEBands;i++)
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{
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int N;
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N=(m->eBands[i+1]-m->eBands[i])<<LM;
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cap[i] = (m->cache.caps[m->nbEBands*(2*LM+C-1)+i]+64)*C*N>>2;
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}
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}
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const char *opus_strerror(int error)
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{
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static const char * const error_strings[8] = {
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"success",
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"invalid argument",
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"buffer too small",
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"internal error",
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"corrupted stream",
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"request not implemented",
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"invalid state",
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"memory allocation failed"
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};
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if (error > 0 || error < -7)
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return "unknown error";
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else
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return error_strings[-error];
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}
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const char *opus_get_version_string(void)
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{
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return "libopus " PACKAGE_VERSION
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#ifdef FIXED_POINT
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"-fixed"
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#endif
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#ifdef FUZZING
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"-fuzzing"
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#endif
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;
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}
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