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
/*
|
|
* Copyright (c) 2015 Peter Meerwald <pmeerw@pmeerw.net>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "g722dsp.h"
|
|
#include "mathops.h"
|
|
|
|
/*
|
|
* quadrature mirror filter (QMF) coefficients (ITU-T G.722 Table 11) inlined
|
|
* in code below: 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11
|
|
*/
|
|
|
|
static void g722_apply_qmf(const int16_t *prev_samples, int xout[2])
|
|
{
|
|
xout[1] = MUL16(*prev_samples++, 3);
|
|
xout[0] = MUL16(*prev_samples++, -11);
|
|
|
|
MAC16(xout[1], *prev_samples++, -11);
|
|
MAC16(xout[0], *prev_samples++, 53);
|
|
|
|
MAC16(xout[1], *prev_samples++, 12);
|
|
MAC16(xout[0], *prev_samples++, -156);
|
|
|
|
MAC16(xout[1], *prev_samples++, 32);
|
|
MAC16(xout[0], *prev_samples++, 362);
|
|
|
|
MAC16(xout[1], *prev_samples++, -210);
|
|
MAC16(xout[0], *prev_samples++, -805);
|
|
|
|
MAC16(xout[1], *prev_samples++, 951);
|
|
MAC16(xout[0], *prev_samples++, 3876);
|
|
|
|
MAC16(xout[1], *prev_samples++, 3876);
|
|
MAC16(xout[0], *prev_samples++, 951);
|
|
|
|
MAC16(xout[1], *prev_samples++, -805);
|
|
MAC16(xout[0], *prev_samples++, -210);
|
|
|
|
MAC16(xout[1], *prev_samples++, 362);
|
|
MAC16(xout[0], *prev_samples++, 32);
|
|
|
|
MAC16(xout[1], *prev_samples++, -156);
|
|
MAC16(xout[0], *prev_samples++, 12);
|
|
|
|
MAC16(xout[1], *prev_samples++, 53);
|
|
MAC16(xout[0], *prev_samples++, -11);
|
|
|
|
MAC16(xout[1], *prev_samples++, -11);
|
|
MAC16(xout[0], *prev_samples++, 3);
|
|
}
|
|
|
|
av_cold void ff_g722dsp_init(G722DSPContext *c)
|
|
{
|
|
c->apply_qmf = g722_apply_qmf;
|
|
|
|
#if ARCH_ARM
|
|
ff_g722dsp_init_arm(c);
|
|
#elif ARCH_X86
|
|
ff_g722dsp_init_x86(c);
|
|
#endif
|
|
}
|