129 lines
3.2 KiB
C++
129 lines
3.2 KiB
C++
/*
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* Copyright 2003-2021 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 "ConfigGlue.hxx"
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#include "ReadFrames.hxx"
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#include "fs/Path.hxx"
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#include "fs/NarrowPath.hxx"
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#include "filter/LoadOne.hxx"
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#include "filter/Filter.hxx"
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#include "filter/Prepared.hxx"
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#include "pcm/AudioParser.hxx"
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#include "pcm/AudioFormat.hxx"
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#include "pcm/Volume.hxx"
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#include "mixer/MixerControl.hxx"
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#include "system/Error.hxx"
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#include "io/FileDescriptor.hxx"
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#include "util/StringBuffer.hxx"
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#include "util/RuntimeError.hxx"
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#include "util/PrintException.hxx"
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#include <cassert>
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#include <memory>
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#include <stdexcept>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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void
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mixer_set_volume([[maybe_unused]] Mixer *mixer,
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[[maybe_unused]] unsigned volume)
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{
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}
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static std::unique_ptr<PreparedFilter>
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LoadFilter(const ConfigData &config, const char *name)
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{
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const auto *param = config.FindBlock(ConfigBlockOption::AUDIO_FILTER,
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"name", name);
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if (param == nullptr)
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throw FormatRuntimeError("No such configured filter: %s",
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name);
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return filter_configured_new(*param);
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}
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int main(int argc, char **argv)
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try {
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if (argc < 3 || argc > 4) {
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fprintf(stderr, "Usage: run_filter CONFIG NAME [FORMAT] <IN\n");
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return EXIT_FAILURE;
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}
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const FromNarrowPath config_path = argv[1];
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AudioFormat audio_format(44100, SampleFormat::S16, 2);
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/* read configuration file (mpd.conf) */
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const auto config = AutoLoadConfigFile(config_path);
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/* parse the audio format */
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if (argc > 3)
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audio_format = ParseAudioFormat(argv[3], false);
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const size_t in_frame_size = audio_format.GetFrameSize();
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/* initialize the filter */
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auto prepared_filter = LoadFilter(config, argv[2]);
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/* open the filter */
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auto filter = prepared_filter->Open(audio_format);
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const AudioFormat out_audio_format = filter->GetOutAudioFormat();
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fprintf(stderr, "audio_format=%s\n",
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ToString(out_audio_format).c_str());
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/* play */
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FileDescriptor input_fd(STDIN_FILENO);
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FileDescriptor output_fd(STDOUT_FILENO);
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while (true) {
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std::byte buffer[4096];
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ssize_t nbytes = ReadFrames(input_fd, buffer, sizeof(buffer),
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in_frame_size);
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if (nbytes == 0)
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break;
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auto dest = filter->FilterPCM(std::span{buffer}.first(nbytes));
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output_fd.FullWrite(dest.data(), dest.size());
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}
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while (true) {
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auto dest = filter->Flush();
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if (dest.data() == nullptr)
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break;
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output_fd.FullWrite(dest.data(), dest.size());
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}
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/* cleanup and exit */
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return EXIT_SUCCESS;
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} catch (...) {
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PrintException(std::current_exception());
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return EXIT_FAILURE;
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}
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