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// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright The Music Player Daemon Project
/*
* This program is a command line interface to MPD's PCM conversion
* library (pcm_convert.c).
*
*/
#include "ConfigGlue.hxx"
#include "pcm/AudioParser.hxx"
#include "pcm/AudioFormat.hxx"
#include "pcm/Convert.hxx"
#include "fs/Path.hxx"
#include "fs/NarrowPath.hxx"
#include "io/FileDescriptor.hxx"
#include "util/StaticFifoBuffer.hxx"
#include "cmdline/OptionDef.hxx"
#include "cmdline/OptionParser.hxx"
#include "util/PrintException.hxx"
#include "Log.hxx"
#include "LogBackend.hxx"
#include <cassert>
#include <stdexcept>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
struct CommandLine {
AudioFormat in_audio_format, out_audio_format;
FromNarrowPath config_path;
bool verbose = false;
};
enum Option {
OPTION_CONFIG,
OPTION_VERBOSE,
};
static constexpr OptionDef option_defs[] = {
{"config", 0, true, "Load a MPD configuration file"},
{"verbose", 'v', false, "Verbose logging"},
};
static CommandLine
ParseCommandLine(int argc, char **argv)
{
CommandLine c;
OptionParser option_parser(option_defs, argc, argv);
while (auto o = option_parser.Next()) {
switch (Option(o.index)) {
case OPTION_CONFIG:
c.config_path = o.value;
break;
case OPTION_VERBOSE:
c.verbose = true;
break;
}
}
auto args = option_parser.GetRemaining();
if (args.size() != 2)
throw std::runtime_error("Usage: run_convert IN_FORMAT OUT_FORMAT <IN >OUT");
c.in_audio_format = ParseAudioFormat(args[0], false);
c.out_audio_format = c.in_audio_format.WithMask(ParseAudioFormat(args[1], false));
return c;
}
class GlobalInit {
const ConfigData config;
public:
explicit GlobalInit(Path config_path)
:config(AutoLoadConfigFile(config_path))
{
pcm_convert_global_init(config);
}
};
static void
RunConvert(PcmConvert &convert, size_t in_frame_size,
FileDescriptor in_fd, FileDescriptor out_fd)
{
in_fd.SetBinaryMode();
out_fd.SetBinaryMode();
StaticFifoBuffer<std::byte, 4096> buffer;
while (true) {
{
const auto dest = buffer.Write();
assert(!dest.empty());
ssize_t nbytes = in_fd.Read(dest);
if (nbytes <= 0)
break;
buffer.Append(nbytes);
}
auto src = buffer.Read();
assert(!src.empty());
src = src.first(src.size() - src.size() % in_frame_size);
if (src.empty())
continue;
buffer.Consume(src.size());
auto output = convert.Convert(src);
out_fd.FullWrite(output);
}
while (true) {
auto output = convert.Flush();
if (output.data() == nullptr)
break;
out_fd.FullWrite(output);
}
}
int
main(int argc, char **argv)
try {
const auto c = ParseCommandLine(argc, argv);
SetLogThreshold(c.verbose ? LogLevel::DEBUG : LogLevel::INFO);
const GlobalInit init(c.config_path);
PcmConvert state(c.in_audio_format, c.out_audio_format);
RunConvert(state, c.in_audio_format.GetFrameSize(),
FileDescriptor(STDIN_FILENO),
FileDescriptor(STDOUT_FILENO));
return EXIT_SUCCESS;
} catch (...) {
PrintException(std::current_exception());
return EXIT_FAILURE;
}
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