eessppeelllloo/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-12-16 03:50:05 +01:00
Code Issues Packages Projects Releases Wiki Activity

truehd: add hand-scheduled ARM asm version of mlp_filter_channel.

Browse Source 
Profiling results for overall audio decode and the mlp_filter_channel(_arm)
function in particular are as follows:

              Before          After
              Mean   StdDev   Mean   StdDev  Confidence  Change
6:2 total     380.4  22.0     370.8  17.0    87.4%       +2.6%  (insignificant)
6:2 function  60.7   7.2      36.6   8.1     100.0%      +65.8%
8:2 total     357.0  17.5     343.2  19.0    97.8%       +4.0%  (insignificant)
8:2 function  60.3   8.8      37.3   3.8     100.0%      +61.8%
6:6 total     717.2  23.2     658.4  15.7    100.0%      +8.9%
6:6 function  140.4  12.9     81.5   9.2     100.0%      +72.4%
8:8 total     981.9  16.2     896.2  24.5    100.0%      +9.6%
8:8 function  193.4  15.0     103.3  11.5    100.0%      +87.2%

Experiments with adding preload instructions to this function yielded no
useful benefit, so these have not been included.

The assembly version has also been tested with a fuzz tester to ensure that
any combinations of inputs not exercised by my available test streams still
generate mathematically identical results to the C version.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Ben Avison
2014-03-20 18:58:35 +00:00
committed by Martin Storsjö
parent efc7290eb6
commit 15a29c39d9
5 changed files with 478 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
libavcodec/arm/mlpdsp_init_arm.c Normal file
View File

@@ -0,0 +1,40 @@
/*
* Copyright (c) 2014 RISC OS Open Ltd
* Author: Ben Avison <bavison@riscosopen.org>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "libavutil/arm/cpu.h"
#include "libavutil/attributes.h"
#include "libavcodec/mlpdsp.h"
void ff_mlp_filter_channel_arm(int32_t *state, const int32_t *coeff,
int firorder, int iirorder,
unsigned int filter_shift, int32_t mask,
int blocksize, int32_t *sample_buffer);
av_cold void ff_mlpdsp_init_arm(MLPDSPContext *c)
{
int cpu_flags = av_get_cpu_flags();
if (have_armv5te(cpu_flags)) {
c->mlp_filter_channel = ff_mlp_filter_channel_arm;
}
}