118 lines
3.1 KiB
C++
118 lines
3.1 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 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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*
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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 "NonBlock.hxx"
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#include "Error.hxx"
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#include "event/MultiSocketMonitor.hxx"
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#include "util/RuntimeError.hxx"
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Event::Duration
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AlsaNonBlockPcm::PrepareSockets(MultiSocketMonitor &m, snd_pcm_t *pcm)
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{
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int count = snd_pcm_poll_descriptors_count(pcm);
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if (count <= 0) {
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if (count == 0)
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throw std::runtime_error("snd_pcm_poll_descriptors_count() failed");
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else
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throw Alsa::MakeError(count, "snd_pcm_poll_descriptors_count() failed");
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}
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struct pollfd *pfds = pfd_buffer.Get(count);
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count = snd_pcm_poll_descriptors(pcm, pfds, count);
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if (count <= 0) {
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if (count == 0)
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throw std::runtime_error("snd_pcm_poll_descriptors() failed");
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else
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throw Alsa::MakeError(count, "snd_pcm_poll_descriptors() failed");
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}
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m.ReplaceSocketList(pfds, count);
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return Event::Duration(-1);
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}
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void
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AlsaNonBlockPcm::DispatchSockets(MultiSocketMonitor &m,
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snd_pcm_t *pcm)
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{
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int count = snd_pcm_poll_descriptors_count(pcm);
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if (count <= 0)
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return;
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const auto pfds = pfd_buffer.Get(count), end = pfds + count;
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auto *i = pfds;
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m.ForEachReturnedEvent([&i, end](SocketDescriptor s, unsigned events){
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if (i >= end)
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return;
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i->fd = s.Get();
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i->events = i->revents = events;
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++i;
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});
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unsigned short dummy;
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int err = snd_pcm_poll_descriptors_revents(pcm, pfds, i - pfds, &dummy);
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if (err < 0)
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throw Alsa::MakeError(err, "snd_pcm_poll_descriptors_revents() failed");
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}
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Event::Duration
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AlsaNonBlockMixer::PrepareSockets(MultiSocketMonitor &m, snd_mixer_t *mixer) noexcept
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{
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int count = snd_mixer_poll_descriptors_count(mixer);
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if (count <= 0) {
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m.ClearSocketList();
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return Event::Duration(-1);
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}
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struct pollfd *pfds = pfd_buffer.Get(count);
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count = snd_mixer_poll_descriptors(mixer, pfds, count);
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if (count < 0)
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count = 0;
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m.ReplaceSocketList(pfds, count);
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return Event::Duration(-1);
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}
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void
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AlsaNonBlockMixer::DispatchSockets(MultiSocketMonitor &m,
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snd_mixer_t *mixer) noexcept
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{
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int count = snd_mixer_poll_descriptors_count(mixer);
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if (count <= 0)
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return;
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const auto pfds = pfd_buffer.Get(count), end = pfds + count;
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auto *i = pfds;
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m.ForEachReturnedEvent([&i, end](SocketDescriptor s, unsigned events){
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if (i >= end)
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return;
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i->fd = s.Get();
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i->events = i->revents = events;
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++i;
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});
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unsigned short dummy;
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snd_mixer_poll_descriptors_revents(mixer, pfds, i - pfds, &dummy);
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}
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