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// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright The Music Player Daemon Project
#include "output/Interface.hxx"
#include "output/Registry.hxx"
#include "output/OutputPlugin.hxx"
#include "ConfigGlue.hxx"
#include "lib/fmt/AudioFormatFormatter.hxx"
#include "lib/fmt/RuntimeError.hxx"
#include "event/Thread.hxx"
#include "fs/Path.hxx"
#include "fs/NarrowPath.hxx"
#include "pcm/AudioParser.hxx"
#include "pcm/AudioFormat.hxx"
#include "cmdline/OptionDef.hxx"
#include "cmdline/OptionParser.hxx"
#include "io/FileDescriptor.hxx"
#include "util/StringBuffer.hxx"
#include "util/ScopeExit.hxx"
#include "util/StaticFifoBuffer.hxx"
#include "util/PrintException.hxx"
#include "LogBackend.hxx"
#include <cassert>
#include <memory>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
struct CommandLine {
FromNarrowPath config_path;
const char *output_name = nullptr;
AudioFormat audio_format{44100, SampleFormat::S16, 2};
bool verbose = false;
};
enum Option {
OPTION_VERBOSE,
};
static constexpr OptionDef option_defs[] = {
{"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_VERBOSE:
c.verbose = true;
break;
}
}
auto args = option_parser.GetRemaining();
if (args.size() < 2 || args.size() > 3)
throw std::runtime_error("Usage: run_output CONFIG NAME [FORMAT] <IN");
c.config_path = args[0];
c.output_name = args[1];
if (args.size() > 2)
c.audio_format = ParseAudioFormat(args[2], false);
return c;
}
static std::unique_ptr<AudioOutput>
LoadAudioOutput(const ConfigData &config, EventLoop &event_loop,
const char *name)
{
const auto *block = config.FindBlock(ConfigBlockOption::AUDIO_OUTPUT,
"name", name);
if (block == nullptr)
throw FmtRuntimeError("No such configured audio output: {}",
name);
const char *plugin_name = block->GetBlockValue("type");
if (plugin_name == nullptr)
throw std::runtime_error("Missing \"type\" configuration");
const auto *plugin = GetAudioOutputPluginByName(plugin_name);
if (plugin == nullptr)
throw FmtRuntimeError("No such audio output plugin: {}",
plugin_name);
return std::unique_ptr<AudioOutput>(ao_plugin_init(event_loop, *plugin,
*block));
}
static void
RunOutput(AudioOutput &ao, AudioFormat audio_format,
FileDescriptor in_fd)
{
in_fd.SetBinaryMode();
/* open the audio output */
ao.Enable();
AtScopeExit(&ao) { ao.Disable(); };
ao.Open(audio_format);
AtScopeExit(&ao) { ao.Close(); };
fmt::print(stderr, "audio_format={}\n", audio_format);
const size_t in_frame_size = audio_format.GetFrameSize();
/* play */
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;
size_t consumed = ao.Play(src);
assert(consumed <= src.size());
assert(consumed % in_frame_size == 0);
buffer.Consume(consumed);
}
ao.Drain();
}
int main(int argc, char **argv)
try {
const auto c = ParseCommandLine(argc, argv);
SetLogThreshold(c.verbose ? LogLevel::DEBUG : LogLevel::INFO);
/* read configuration file (mpd.conf) */
const auto config = AutoLoadConfigFile(c.config_path);
EventThread io_thread;
io_thread.Start();
/* initialize the audio output */
auto ao = LoadAudioOutput(config, io_thread.GetEventLoop(),
c.output_name);
/* do it */
RunOutput(*ao, c.audio_format, FileDescriptor(STDIN_FILENO));
/* cleanup and exit */
return EXIT_SUCCESS;
} catch (...) {
PrintException(std::current_exception());
return EXIT_FAILURE;
}
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