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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.
*/
/*
* This program is a command line interface to MPD's software volume
* library (pcm_volume.c).
*
*/
#include "pcm/Volume.hxx"
#include "pcm/AudioParser.hxx"
#include "pcm/AudioFormat.hxx"
#include "util/ConstBuffer.hxx"
#include "util/PrintException.hxx"
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
int
main(int argc, char **argv)
try {
static char buffer[4096];
ssize_t nbytes;
if (argc > 2) {
fprintf(stderr, "Usage: software_volume [FORMAT] <IN >OUT\n");
return EXIT_FAILURE;
}
AudioFormat audio_format(48000, SampleFormat::S16, 2);
if (argc > 1)
audio_format = ParseAudioFormat(argv[1], false);
PcmVolume pv;
const auto out_sample_format = pv.Open(audio_format.format, false);
if (out_sample_format != audio_format.format)
fprintf(stderr, "Converting to %s\n",
sample_format_to_string(out_sample_format));
while ((nbytes = read(0, buffer, sizeof(buffer))) > 0) {
auto dest = pv.Apply({buffer, size_t(nbytes)});
[[maybe_unused]] ssize_t ignored = write(1, dest.data, dest.size);
}
pv.Close();
} catch (...) {
PrintException(std::current_exception());
return EXIT_FAILURE;
}
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