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