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40e6575aa3
This is more spec-compliant because it does not rely on dead-code elimination by the compiler. Especially MSVC has problems with this, as can be seen in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/296373.html or https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/297022.html This commit does not eliminate every instance where we rely on dead code elimination: It only tackles branching to the initialization of arch-specific dsp code, not e.g. all uses of CONFIG_ and HAVE_ checks. But maybe it is already enough to compile FFmpeg with MSVC with whole-programm-optimizations enabled (if one does not disable too many components). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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* Copyright (c) 2015 Peter Meerwald <pmeerw@pmeerw.net>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "g722dsp.h"
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#include "mathops.h"
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/*
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* quadrature mirror filter (QMF) coefficients (ITU-T G.722 Table 11) inlined
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* in code below: 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11
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*/
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static void g722_apply_qmf(const int16_t *prev_samples, int xout[2])
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{
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xout[1] = MUL16(*prev_samples++, 3);
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xout[0] = MUL16(*prev_samples++, -11);
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MAC16(xout[1], *prev_samples++, -11);
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MAC16(xout[0], *prev_samples++, 53);
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MAC16(xout[1], *prev_samples++, 12);
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MAC16(xout[0], *prev_samples++, -156);
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MAC16(xout[1], *prev_samples++, 32);
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MAC16(xout[0], *prev_samples++, 362);
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MAC16(xout[1], *prev_samples++, -210);
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MAC16(xout[0], *prev_samples++, -805);
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MAC16(xout[1], *prev_samples++, 951);
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MAC16(xout[0], *prev_samples++, 3876);
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MAC16(xout[1], *prev_samples++, 3876);
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MAC16(xout[0], *prev_samples++, 951);
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MAC16(xout[1], *prev_samples++, -805);
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MAC16(xout[0], *prev_samples++, -210);
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MAC16(xout[1], *prev_samples++, 362);
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MAC16(xout[0], *prev_samples++, 32);
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MAC16(xout[1], *prev_samples++, -156);
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MAC16(xout[0], *prev_samples++, 12);
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MAC16(xout[1], *prev_samples++, 53);
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MAC16(xout[0], *prev_samples++, -11);
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MAC16(xout[1], *prev_samples++, -11);
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MAC16(xout[0], *prev_samples++, 3);
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}
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av_cold void ff_g722dsp_init(G722DSPContext *c)
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{
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c->apply_qmf = g722_apply_qmf;
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#if ARCH_ARM
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ff_g722dsp_init_arm(c);
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#elif ARCH_X86
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ff_g722dsp_init_x86(c);
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#endif
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}
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