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/*
* Copyright (C) 2003-2015 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "SoxrResampler.hxx"
#include "AudioFormat.hxx"
#include "util/ASCII.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <soxr.h>
#include <assert.h>
#include <string.h>
static constexpr Domain soxr_domain("soxr");
static constexpr unsigned long SOXR_DEFAULT_RECIPE = SOXR_HQ;
/**
* Special value for "invalid argument".
*/
static constexpr unsigned long SOXR_INVALID_RECIPE = -1;
static soxr_quality_spec_t soxr_quality;
static const char *
soxr_quality_name(unsigned long recipe)
{
switch (recipe) {
case SOXR_VHQ:
return "Very High Quality";
case SOXR_HQ:
return "High Quality";
case SOXR_MQ:
return "Medium Quality";
case SOXR_LQ:
return "Low Quality";
case SOXR_QQ:
return "Quick";
}
gcc_unreachable();
}
gcc_pure
static unsigned long
soxr_parse_converter(const char *converter)
{
assert(converter != nullptr);
assert(memcmp(converter, "soxr", 4) == 0);
if (converter[4] == '\0')
return SOXR_DEFAULT_RECIPE;
if (converter[4] != ' ')
return SOXR_INVALID_RECIPE;
// converter example is "soxr very high", we want the "very high" part
const char *quality = converter + 5;
if (strcmp(quality, "very high") == 0)
return SOXR_VHQ;
else if (strcmp(quality, "high") == 0)
return SOXR_HQ;
else if (strcmp(quality, "medium") == 0)
return SOXR_MQ;
else if (strcmp(quality, "low") == 0)
return SOXR_LQ;
else if (strcmp(quality, "quick") == 0)
return SOXR_QQ;
else
return SOXR_INVALID_RECIPE;
}
bool
pcm_resample_soxr_global_init(const char *converter, Error &error)
{
unsigned long recipe = soxr_parse_converter(converter);
if (recipe == SOXR_INVALID_RECIPE) {
error.Format(soxr_domain,
"unknown samplerate converter '%s'", converter);
return false;
}
soxr_quality = soxr_quality_spec(recipe, 0);
FormatDebug(soxr_domain,
"soxr converter '%s'",
soxr_quality_name(recipe));
return true;
}
AudioFormat
SoxrPcmResampler::Open(AudioFormat &af, unsigned new_sample_rate,
Error &error)
{
assert(af.IsValid());
assert(audio_valid_sample_rate(new_sample_rate));
soxr_error_t e;
soxr = soxr_create(af.sample_rate, new_sample_rate,
af.channels, &e,
nullptr, &soxr_quality, nullptr);
if (soxr == nullptr) {
error.Format(soxr_domain,
"soxr initialization has failed: %s", e);
return AudioFormat::Undefined();
}
FormatDebug(soxr_domain, "soxr engine '%s'", soxr_engine(soxr));
channels = af.channels;
ratio = float(new_sample_rate) / float(af.sample_rate);
FormatDebug(soxr_domain,
"samplerate conversion ratio to %.2lf",
ratio);
/* libsoxr works with floating point samples */
af.format = SampleFormat::FLOAT;
AudioFormat result = af;
result.sample_rate = new_sample_rate;
return result;
}
void
SoxrPcmResampler::Close()
{
soxr_delete(soxr);
}
ConstBuffer<void>
SoxrPcmResampler::Resample(ConstBuffer<void> src, Error &error)
{
const size_t frame_size = channels * sizeof(float);
assert(src.size % frame_size == 0);
const size_t n_frames = src.size / frame_size;
/* always round up: worst case output buffer size */
const size_t o_frames = size_t(n_frames * ratio) + 1;
float *output_buffer = (float *)buffer.Get(o_frames * frame_size);
size_t i_done, o_done;
soxr_error_t e = soxr_process(soxr, src.data, n_frames, &i_done,
output_buffer, o_frames, &o_done);
if (e != nullptr) {
error.Format(soxr_domain, "soxr error: %s", e);
return nullptr;
}
return { output_buffer, o_done * frame_size };
}
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