2009-03-13 18:43:16 +01:00
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/*
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2020-01-18 19:22:19 +01:00
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* Copyright 2003-2020 The Music Player Daemon Project
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2009-03-13 18:43:16 +01:00
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* http://www.musicpd.org
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2007-06-13 16:15:30 +02:00
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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 be 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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2009-03-13 18:43:16 +01:00
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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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2007-06-13 16:15:30 +02:00
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*/
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2013-04-17 00:12:41 +02:00
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#include "FifoOutputPlugin.hxx"
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2014-01-23 23:49:50 +01:00
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#include "../OutputAPI.hxx"
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2014-02-19 09:00:29 +01:00
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#include "../Timer.hxx"
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2013-10-17 21:59:35 +02:00
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#include "fs/AllocatedPath.hxx"
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2013-08-07 19:54:38 +02:00
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#include "fs/FileSystem.hxx"
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2015-02-28 20:42:50 +01:00
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#include "fs/FileInfo.hxx"
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2013-08-10 18:02:44 +02:00
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#include "util/Domain.hxx"
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2016-11-05 15:13:14 +01:00
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#include "util/RuntimeError.hxx"
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2013-09-27 22:31:24 +02:00
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#include "Log.hxx"
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2010-05-20 06:59:25 +02:00
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#include "open.h"
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2007-06-13 16:15:30 +02:00
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2008-10-08 10:49:29 +02:00
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#include <sys/stat.h>
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2009-01-03 14:51:34 +01:00
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#include <errno.h>
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#include <unistd.h>
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2008-10-08 10:49:29 +02:00
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2017-08-09 16:58:44 +02:00
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class FifoOutput final : AudioOutput {
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2016-11-05 15:13:14 +01:00
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const AllocatedPath path;
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2013-08-07 19:54:38 +02:00
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std::string path_utf8;
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2016-11-05 15:13:14 +01:00
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int input = -1;
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int output = -1;
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bool created = false;
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2013-05-12 15:03:42 +02:00
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Timer *timer;
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2013-04-17 00:12:41 +02:00
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2015-01-17 19:16:18 +01:00
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public:
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2016-11-05 15:13:14 +01:00
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FifoOutput(const ConfigBlock &block);
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2013-04-17 00:12:41 +02:00
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2015-01-28 19:43:37 +01:00
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~FifoOutput() {
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2015-08-06 09:49:00 +02:00
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CloseFifo();
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2015-01-28 19:43:37 +01:00
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}
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2017-08-09 16:58:44 +02:00
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static AudioOutput *Create(EventLoop &,
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const ConfigBlock &block) {
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return new FifoOutput(block);
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}
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2015-01-28 19:43:37 +01:00
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2017-08-09 16:58:44 +02:00
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private:
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2016-11-05 15:13:14 +01:00
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void Create();
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void Check();
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2013-04-17 00:12:41 +02:00
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void Delete();
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2016-11-05 15:13:14 +01:00
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void OpenFifo();
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2015-08-06 09:49:00 +02:00
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void CloseFifo();
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2015-01-28 19:43:37 +01:00
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2017-08-09 16:58:44 +02:00
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void Open(AudioFormat &audio_format) override;
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void Close() noexcept override;
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2015-08-06 09:50:02 +02:00
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2017-08-09 16:58:44 +02:00
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std::chrono::steady_clock::duration Delay() const noexcept override;
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size_t Play(const void *chunk, size_t size) override;
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void Cancel() noexcept override;
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2009-02-25 19:53:24 +01:00
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};
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2007-06-13 16:15:30 +02:00
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2013-08-10 18:02:44 +02:00
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static constexpr Domain fifo_output_domain("fifo_output");
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2009-02-26 22:04:59 +01:00
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2016-11-05 15:13:14 +01:00
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FifoOutput::FifoOutput(const ConfigBlock &block)
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2017-08-09 16:58:44 +02:00
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:AudioOutput(0),
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2016-11-05 15:13:14 +01:00
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path(block.GetPath("path"))
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{
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if (path.IsNull())
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throw std::runtime_error("No \"path\" parameter specified");
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path_utf8 = path.ToUTF8();
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OpenFifo();
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}
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2013-04-17 00:12:41 +02:00
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inline void
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FifoOutput::Delete()
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2007-06-13 16:15:30 +02:00
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{
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2013-09-27 22:31:24 +02:00
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FormatDebug(fifo_output_domain,
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"Removing FIFO \"%s\"", path_utf8.c_str());
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2007-06-13 16:15:30 +02:00
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2016-08-15 22:25:15 +02:00
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try {
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RemoveFile(path);
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2017-12-19 10:56:23 +01:00
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} catch (...) {
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LogError(std::current_exception(), "Could not remove FIFO");
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2007-06-13 16:15:30 +02:00
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return;
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}
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2013-04-17 00:12:41 +02:00
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created = false;
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2007-06-13 16:15:30 +02:00
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}
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2013-04-17 00:12:41 +02:00
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void
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2015-08-06 09:49:00 +02:00
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FifoOutput::CloseFifo()
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2007-06-13 16:15:30 +02:00
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{
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2013-04-17 00:12:41 +02:00
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if (input >= 0) {
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close(input);
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input = -1;
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2007-06-13 16:15:30 +02:00
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}
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2013-04-17 00:12:41 +02:00
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if (output >= 0) {
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close(output);
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output = -1;
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2007-06-13 16:15:30 +02:00
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}
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2015-02-28 20:42:50 +01:00
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FileInfo fi;
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if (created && GetFileInfo(path, fi))
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2013-04-17 00:12:41 +02:00
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Delete();
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2007-06-13 16:15:30 +02:00
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}
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2016-11-05 15:13:14 +01:00
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inline void
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FifoOutput::Create()
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2007-06-13 16:15:30 +02:00
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{
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2016-11-05 15:13:14 +01:00
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if (!MakeFifo(path, 0666))
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throw FormatErrno("Couldn't create FIFO \"%s\"",
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2013-08-10 18:02:44 +02:00
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path_utf8.c_str());
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2007-06-13 16:15:30 +02:00
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2013-04-17 00:12:41 +02:00
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created = true;
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2007-06-13 16:15:30 +02:00
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}
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2016-11-05 15:13:14 +01:00
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inline void
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FifoOutput::Check()
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2007-06-13 16:15:30 +02:00
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{
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struct stat st;
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2013-08-07 19:54:38 +02:00
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if (!StatFile(path, st)) {
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2007-06-13 16:15:30 +02:00
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if (errno == ENOENT) {
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/* Path doesn't exist */
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2016-11-05 15:13:14 +01:00
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Create();
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return;
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2007-06-13 16:15:30 +02:00
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}
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2016-11-05 15:13:14 +01:00
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throw FormatErrno("Failed to stat FIFO \"%s\"",
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2013-08-10 18:02:44 +02:00
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path_utf8.c_str());
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2007-06-13 16:15:30 +02:00
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}
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2016-11-05 15:13:14 +01:00
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if (!S_ISFIFO(st.st_mode))
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throw FormatRuntimeError("\"%s\" already exists, but is not a FIFO",
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path_utf8.c_str());
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2007-06-13 16:15:30 +02:00
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}
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2016-11-05 15:13:14 +01:00
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inline void
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FifoOutput::OpenFifo()
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try {
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Check();
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2007-06-13 16:15:30 +02:00
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2017-08-10 19:32:17 +02:00
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input = OpenFile(path, O_RDONLY|O_NONBLOCK|O_BINARY, 0).Steal();
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2016-11-05 15:13:14 +01:00
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if (input < 0)
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throw FormatErrno("Could not open FIFO \"%s\" for reading",
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2013-08-10 18:02:44 +02:00
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path_utf8.c_str());
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2007-06-13 16:15:30 +02:00
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2017-08-10 19:32:17 +02:00
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output = OpenFile(path, O_WRONLY|O_NONBLOCK|O_BINARY, 0).Steal();
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2016-11-05 15:13:14 +01:00
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if (output < 0)
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throw FormatErrno("Could not open FIFO \"%s\" for writing",
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2013-08-10 18:02:44 +02:00
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path_utf8.c_str());
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2016-11-05 15:13:14 +01:00
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} catch (...) {
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CloseFifo();
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throw;
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2007-06-13 16:15:30 +02:00
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}
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2016-11-09 11:56:01 +01:00
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void
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FifoOutput::Open(AudioFormat &audio_format)
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2007-06-13 16:15:30 +02:00
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{
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2015-08-06 09:50:02 +02:00
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timer = new Timer(audio_format);
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2007-06-13 16:15:30 +02:00
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}
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2015-08-06 09:50:02 +02:00
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void
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2017-08-09 16:58:44 +02:00
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FifoOutput::Close() noexcept
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2007-06-13 16:15:30 +02:00
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{
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2015-08-06 09:50:02 +02:00
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delete timer;
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2007-06-13 16:15:30 +02:00
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}
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2017-08-09 16:58:44 +02:00
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void
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FifoOutput::Cancel() noexcept
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2007-06-13 16:15:30 +02:00
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{
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2015-01-28 19:43:37 +01:00
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timer->Reset();
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2007-06-13 16:15:30 +02:00
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2015-08-06 10:14:35 +02:00
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ssize_t bytes;
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2015-08-06 10:13:21 +02:00
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do {
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2015-08-06 10:15:19 +02:00
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char buffer[16384];
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bytes = read(input, buffer, sizeof(buffer));
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2015-08-06 10:13:21 +02:00
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} while (bytes > 0 && errno != EINTR);
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2007-06-13 16:15:30 +02:00
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if (bytes < 0 && errno != EAGAIN) {
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2013-09-27 22:31:24 +02:00
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FormatErrno(fifo_output_domain,
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"Flush of FIFO \"%s\" failed",
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2015-01-28 19:43:37 +01:00
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path_utf8.c_str());
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2007-06-13 16:15:30 +02:00
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}
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}
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2017-08-09 16:58:44 +02:00
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std::chrono::steady_clock::duration
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2017-05-08 14:44:49 +02:00
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FifoOutput::Delay() const noexcept
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2011-12-13 21:12:48 +01:00
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{
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2015-01-28 19:43:37 +01:00
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return timer->IsStarted()
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2016-12-28 10:11:07 +01:00
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? timer->GetDelay()
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2016-12-28 21:44:18 +01:00
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: std::chrono::steady_clock::duration::zero();
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2011-12-13 21:12:48 +01:00
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}
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2017-08-09 16:58:44 +02:00
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size_t
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2016-11-09 11:56:01 +01:00
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FifoOutput::Play(const void *chunk, size_t size)
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2007-06-13 16:15:30 +02:00
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{
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2015-01-28 19:43:37 +01:00
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if (!timer->IsStarted())
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timer->Start();
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timer->Add(size);
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2007-06-13 16:15:30 +02:00
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2009-02-23 09:29:56 +01:00
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while (true) {
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2015-01-28 19:43:37 +01:00
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ssize_t bytes = write(output, chunk, size);
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2009-02-23 09:29:56 +01:00
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if (bytes > 0)
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return (size_t)bytes;
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2007-06-13 16:15:30 +02:00
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if (bytes < 0) {
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switch (errno) {
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case EAGAIN:
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/* The pipe is full, so empty it */
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2015-01-28 19:43:37 +01:00
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Cancel();
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2007-06-13 16:15:30 +02:00
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continue;
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case EINTR:
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continue;
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}
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2016-11-05 15:13:14 +01:00
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throw FormatErrno("Failed to write to FIFO %s",
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2015-01-28 19:43:37 +01:00
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path_utf8.c_str());
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2007-06-13 16:15:30 +02:00
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}
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}
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}
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2014-01-28 11:22:27 +01:00
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const struct AudioOutputPlugin fifo_output_plugin = {
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2013-04-17 00:12:41 +02:00
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"fifo",
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nullptr,
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2017-08-09 16:58:44 +02:00
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&FifoOutput::Create,
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2013-04-17 00:12:41 +02:00
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nullptr,
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2007-06-13 16:15:30 +02:00
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};
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