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volume: Add Orc-based optimised volume scaling

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This adds volume scaling for 1- and 2-channel software volume scaling
using Orc. While testing the MMX and SSE backends on a Core2, I see an
~2x performance benefit over the hand-rolled MMX and SSE code. Since I
haven't been able to test on other architectures, the Orc code is only
used when MMX/SSE* is present. This can be changed in the future after
testing on AMD and ARM machines.
This commit is contained in:
Arun Raghavan 2010-10-25 17:59:08 +01:00
parent 516dd169b4
commit 4cd90d9e32
6 changed files with 282 additions and 0 deletions
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117
src/pulsecore/svolume_orc.c Normal file
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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk>
Copyright 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
PulseAudio 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.
PulseAudio 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
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "cpu-orc.h"
#include <pulse/xmalloc.h>
#include <pulse/rtclock.h>
#include <pulsecore/sample-util.h>
#include <pulsecore/random.h>
#include <pulsecore/svolume-orc-gen.h>
pa_do_volume_func_t fallback;
static void
pa_volume_s16ne_orc(int16_t *samples, int32_t *volumes, unsigned channels, unsigned length)
{
if (channels == 2) {
int64_t v = (int64_t)volumes[1] << 32 | volumes[0];
pa_volume_s16ne_orc_2ch (samples, v, ((length / (sizeof(int16_t))) / 2));
} else if (channels == 1)
pa_volume_s16ne_orc_1ch (samples, volumes[0], length / (sizeof(int16_t)));
else
fallback(samples, volumes, channels, length);
}
#undef RUN_TEST
#ifdef RUN_TEST
#define CHANNELS 2
#define SAMPLES 1022
#define TIMES 1000
#define PADDING 16
static void run_test (void) {
int16_t samples[SAMPLES];
int16_t samples_ref[SAMPLES];
int16_t samples_orig[SAMPLES];
int32_t volumes[CHANNELS + PADDING];
int i, j, padding;
pa_do_volume_func_t func;
pa_usec_t start, stop;
func = pa_get_volume_func (PA_SAMPLE_S16NE);
printf ("checking ORC %zd\n", sizeof (samples));
pa_random (samples, sizeof (samples));
memcpy (samples_ref, samples, sizeof (samples));
memcpy (samples_orig, samples, sizeof (samples));
for (i = 0; i < CHANNELS; i++)
volumes[i] = PA_CLAMP_VOLUME(rand() >> 1);
for (padding = 0; padding < PADDING; padding++, i++)
volumes[i] = volumes[padding];
func (samples_ref, volumes, CHANNELS, sizeof (samples));
pa_volume_s16ne_orc (samples, volumes, CHANNELS, sizeof (samples));
for (i = 0; i < SAMPLES; i++) {
if (samples[i] != samples_ref[i]) {
printf ("%d: %04x != %04x (%04x * %04x)\n", i, samples[i], samples_ref[i],
samples_orig[i], volumes[i % CHANNELS]);
}
}
start = pa_rtclock_now();
for (j = 0; j < TIMES; j++) {
memcpy (samples, samples_orig, sizeof (samples));
pa_volume_s16ne_orc (samples, volumes, CHANNELS, sizeof (samples));
}
stop = pa_rtclock_now();
pa_log_info("ORC: %llu usec.", (long long unsigned int)(stop - start));
start = pa_rtclock_now();
for (j = 0; j < TIMES; j++) {
memcpy (samples_ref, samples_orig, sizeof (samples));
func (samples_ref, volumes, CHANNELS, sizeof (samples));
}
stop = pa_rtclock_now();
pa_log_info("ref: %llu usec.", (long long unsigned int)(stop - start));
pa_assert_se(memcmp(samples_ref, samples, sizeof(samples)) == 0);
}
#endif
void pa_volume_func_init_orc(void) {
pa_log_info("Initialising ORC optimized functions.");
#ifdef RUN_TEST
run_test();
#endif
fallback = pa_get_volume_func(PA_SAMPLE_S16NE);
pa_set_volume_func(PA_SAMPLE_S16NE, (pa_do_volume_func_t) pa_volume_s16ne_orc);
}