193 lines
4.5 KiB
C++
193 lines
4.5 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 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 "output/Interface.hxx"
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#include "output/Registry.hxx"
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#include "output/OutputPlugin.hxx"
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#include "ConfigGlue.hxx"
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#include "event/Thread.hxx"
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#include "fs/Path.hxx"
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#include "fs/NarrowPath.hxx"
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#include "pcm/AudioParser.hxx"
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#include "pcm/AudioFormat.hxx"
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#include "util/OptionDef.hxx"
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#include "util/OptionParser.hxx"
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#include "util/StringBuffer.hxx"
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#include "util/RuntimeError.hxx"
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#include "util/ScopeExit.hxx"
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#include "util/StaticFifoBuffer.hxx"
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#include "util/PrintException.hxx"
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#include "LogBackend.hxx"
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#include <cassert>
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#include <memory>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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struct CommandLine {
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FromNarrowPath config_path;
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const char *output_name = nullptr;
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AudioFormat audio_format{44100, SampleFormat::S16, 2};
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bool verbose = false;
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};
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enum Option {
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OPTION_VERBOSE,
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};
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static constexpr OptionDef option_defs[] = {
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{"verbose", 'v', false, "Verbose logging"},
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};
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static CommandLine
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ParseCommandLine(int argc, char **argv)
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{
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CommandLine c;
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OptionParser option_parser(option_defs, argc, argv);
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while (auto o = option_parser.Next()) {
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switch (Option(o.index)) {
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case OPTION_VERBOSE:
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c.verbose = true;
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break;
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}
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}
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auto args = option_parser.GetRemaining();
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if (args.size < 2 || args.size > 3)
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throw std::runtime_error("Usage: run_output CONFIG NAME [FORMAT] <IN");
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c.config_path = args[0];
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c.output_name = args[1];
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if (args.size > 2)
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c.audio_format = ParseAudioFormat(args[2], false);
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return c;
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}
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static std::unique_ptr<AudioOutput>
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LoadAudioOutput(const ConfigData &config, EventLoop &event_loop,
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const char *name)
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{
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const auto *block = config.FindBlock(ConfigBlockOption::AUDIO_OUTPUT,
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"name", name);
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if (block == nullptr)
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throw FormatRuntimeError("No such configured audio output: %s",
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name);
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const char *plugin_name = block->GetBlockValue("type");
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if (plugin_name == nullptr)
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throw std::runtime_error("Missing \"type\" configuration");
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const auto *plugin = AudioOutputPlugin_get(plugin_name);
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if (plugin == nullptr)
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throw FormatRuntimeError("No such audio output plugin: %s",
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plugin_name);
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#include "util/OptionDef.hxx"
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#include "util/OptionParser.hxx"
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return std::unique_ptr<AudioOutput>(ao_plugin_init(event_loop, *plugin,
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*block));
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}
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static void
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RunOutput(AudioOutput &ao, AudioFormat audio_format,
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FileDescriptor in_fd)
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{
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/* open the audio output */
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ao.Enable();
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AtScopeExit(&ao) { ao.Disable(); };
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ao.Open(audio_format);
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AtScopeExit(&ao) { ao.Close(); };
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fprintf(stderr, "audio_format=%s\n",
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ToString(audio_format).c_str());
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const size_t in_frame_size = audio_format.GetFrameSize();
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/* play */
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StaticFifoBuffer<std::byte, 4096> buffer;
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while (true) {
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{
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const auto dest = buffer.Write();
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assert(!dest.empty());
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ssize_t nbytes = in_fd.Read(dest.data, dest.size);
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if (nbytes <= 0)
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break;
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buffer.Append(nbytes);
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}
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auto src = buffer.Read();
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assert(!src.empty());
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src.size -= src.size % in_frame_size;
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if (src.empty())
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continue;
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size_t consumed = ao.Play(src.data, src.size);
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assert(consumed <= src.size);
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assert(consumed % in_frame_size == 0);
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buffer.Consume(consumed);
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}
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}
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int main(int argc, char **argv)
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try {
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const auto c = ParseCommandLine(argc, argv);
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SetLogThreshold(c.verbose ? LogLevel::DEBUG : LogLevel::INFO);
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/* read configuration file (mpd.conf) */
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const auto config = AutoLoadConfigFile(c.config_path);
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EventThread io_thread;
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io_thread.Start();
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/* initialize the audio output */
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auto ao = LoadAudioOutput(config, io_thread.GetEventLoop(),
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c.output_name);
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/* do it */
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RunOutput(*ao, c.audio_format, FileDescriptor(STDIN_FILENO));
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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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