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/*
* Copyright 2003-2020 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "MusicPipe.hxx"
#include "MusicChunk.hxx"
#include <cassert>
#ifndef NDEBUG
bool
MusicPipe::Contains(const MusicChunk *chunk) const noexcept
{
const std::lock_guard<Mutex> protect(mutex);
for (const MusicChunk *i = head.get(); i != nullptr; i = i->next.get())
if (i == chunk)
return true;
return false;
}
#endif
MusicChunkPtr
MusicPipe::Shift() noexcept
{
const std::lock_guard<Mutex> protect(mutex);
auto chunk = std::move(head);
if (chunk != nullptr) {
assert(!chunk->IsEmpty());
head = std::move(chunk->next);
--size;
if (head == nullptr) {
assert(size == 0);
assert(tail_r == &chunk->next);
tail_r = &head;
} else {
assert(size > 0);
assert(tail_r != &chunk->next);
}
#ifndef NDEBUG
if (size == 0)
audio_format.Clear();
#endif
}
return chunk;
}
void
MusicPipe::Clear() noexcept
{
while (Shift()) {}
}
void
MusicPipe::Push(MusicChunkPtr chunk) noexcept
{
assert(!chunk->IsEmpty());
assert(chunk->length == 0 || chunk->audio_format.IsValid());
const std::lock_guard<Mutex> protect(mutex);
assert(size > 0 || !audio_format.IsDefined());
assert(!audio_format.IsDefined() ||
chunk->CheckFormat(audio_format));
#ifndef NDEBUG
if (!audio_format.IsDefined() && chunk->length > 0)
audio_format = chunk->audio_format;
#endif
chunk->next.reset();
*tail_r = std::move(chunk);
tail_r = &(*tail_r)->next;
++size;
}
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