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/*
* Copyright 2003-2021 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 "ConfigGlue.hxx"
#include "fs/Path.hxx"
#include "fs/NarrowPath.hxx"
#include "filter/LoadOne.hxx"
#include "filter/Filter.hxx"
#include "filter/Prepared.hxx"
#include "pcm/AudioParser.hxx"
#include "pcm/AudioFormat.hxx"
#include "pcm/Volume.hxx"
#include "mixer/MixerControl.hxx"
#include "system/Error.hxx"
#include "io/FileDescriptor.hxx"
#include "util/ConstBuffer.hxx"
#include "util/StringBuffer.hxx"
#include "util/RuntimeError.hxx"
#include "util/PrintException.hxx"
#include <cassert>
#include <memory>
#include <stdexcept>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
void
mixer_set_volume([[maybe_unused]] Mixer *mixer,
[[maybe_unused]] unsigned volume)
{
}
static std::unique_ptr<PreparedFilter>
LoadFilter(const ConfigData &config, const char *name)
{
const auto *param = config.FindBlock(ConfigBlockOption::AUDIO_FILTER,
"name", name);
if (param == nullptr)
throw FormatRuntimeError("No such configured filter: %s",
name);
return filter_configured_new(*param);
}
static size_t
ReadOrThrow(FileDescriptor fd, void *buffer, size_t size)
{
auto nbytes = fd.Read(buffer, size);
if (nbytes < 0)
throw MakeErrno("Read failed");
return nbytes;
}
static size_t
ReadFrames(FileDescriptor fd, void *_buffer, size_t size, size_t frame_size)
{
auto buffer = (uint8_t *)_buffer;
size = (size / frame_size) * frame_size;
size_t nbytes = ReadOrThrow(fd, buffer, size);
const size_t modulo = nbytes % frame_size;
if (modulo > 0) {
size_t rest = frame_size - modulo;
fd.FullRead(buffer + nbytes, rest);
nbytes += rest;
}
return nbytes;
}
int main(int argc, char **argv)
try {
if (argc < 3 || argc > 4) {
fprintf(stderr, "Usage: run_filter CONFIG NAME [FORMAT] <IN\n");
return EXIT_FAILURE;
}
const FromNarrowPath config_path = argv[1];
AudioFormat audio_format(44100, SampleFormat::S16, 2);
/* read configuration file (mpd.conf) */
const auto config = AutoLoadConfigFile(config_path);
/* parse the audio format */
if (argc > 3)
audio_format = ParseAudioFormat(argv[3], false);
const size_t in_frame_size = audio_format.GetFrameSize();
/* initialize the filter */
auto prepared_filter = LoadFilter(config, argv[2]);
/* open the filter */
auto filter = prepared_filter->Open(audio_format);
const AudioFormat out_audio_format = filter->GetOutAudioFormat();
fprintf(stderr, "audio_format=%s\n",
ToString(out_audio_format).c_str());
/* play */
FileDescriptor input_fd(STDIN_FILENO);
FileDescriptor output_fd(STDOUT_FILENO);
while (true) {
char buffer[4096];
ssize_t nbytes = ReadFrames(input_fd, buffer, sizeof(buffer),
in_frame_size);
if (nbytes == 0)
break;
auto dest = filter->FilterPCM({(const void *)buffer, (size_t)nbytes});
output_fd.FullWrite(dest.data, dest.size);
}
while (true) {
auto dest = filter->Flush();
if (dest.IsNull())
break;
output_fd.FullWrite(dest.data, dest.size);
}
/* cleanup and exit */
return EXIT_SUCCESS;
} catch (...) {
PrintException(std::current_exception());
return EXIT_FAILURE;
}
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