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/*
* Copyright (C) 2003-2011 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 "config.h"
#include "MusicPipe.hxx"
#include "MusicBuffer.hxx"
#include "MusicChunk.hxx"
#include "thread/Mutex.hxx"
#include <glib.h>
#include <assert.h>
struct music_pipe {
/** the first chunk */
struct music_chunk *head;
/** a pointer to the tail of the chunk */
struct music_chunk **tail_r;
/** the current number of chunks */
unsigned size;
/** a mutex which protects #head and #tail_r */
mutable Mutex mutex;
#ifndef NDEBUG
AudioFormat audio_format;
#endif
music_pipe()
:head(nullptr), tail_r(&head), size(0) {
#ifndef NDEBUG
audio_format.Clear();
#endif
}
~music_pipe() {
assert(head == nullptr);
assert(tail_r == &head);
}
};
struct music_pipe *
music_pipe_new(void)
{
return new music_pipe();
}
void
music_pipe_free(struct music_pipe *mp)
{
delete mp;
}
#ifndef NDEBUG
bool
music_pipe_check_format(const struct music_pipe *pipe,
const AudioFormat audio_format)
{
assert(pipe != NULL);
return !pipe->audio_format.IsDefined() ||
pipe->audio_format == audio_format;
}
bool
music_pipe_contains(const struct music_pipe *mp,
const struct music_chunk *chunk)
{
const ScopeLock protect(mp->mutex);
for (const struct music_chunk *i = mp->head;
i != NULL; i = i->next)
if (i == chunk)
return true;
return false;
}
#endif
const struct music_chunk *
music_pipe_peek(const struct music_pipe *mp)
{
return mp->head;
}
struct music_chunk *
music_pipe_shift(struct music_pipe *mp)
{
const ScopeLock protect(mp->mutex);
struct music_chunk *chunk = mp->head;
if (chunk != NULL) {
assert(!chunk->IsEmpty());
mp->head = chunk->next;
--mp->size;
if (mp->head == NULL) {
assert(mp->size == 0);
assert(mp->tail_r == &chunk->next);
mp->tail_r = &mp->head;
} else {
assert(mp->size > 0);
assert(mp->tail_r != &chunk->next);
}
#ifndef NDEBUG
/* poison the "next" reference */
chunk->next = (struct music_chunk *)(void *)0x01010101;
if (mp->size == 0)
mp->audio_format.Clear();
#endif
}
return chunk;
}
void
music_pipe_clear(struct music_pipe *mp, struct music_buffer *buffer)
{
struct music_chunk *chunk;
while ((chunk = music_pipe_shift(mp)) != NULL)
music_buffer_return(buffer, chunk);
}
void
music_pipe_push(struct music_pipe *mp, struct music_chunk *chunk)
{
assert(!chunk->IsEmpty());
assert(chunk->length == 0 || chunk->audio_format.IsValid());
const ScopeLock protect(mp->mutex);
assert(mp->size > 0 || !mp->audio_format.IsDefined());
assert(!mp->audio_format.IsDefined() ||
chunk->CheckFormat(mp->audio_format));
#ifndef NDEBUG
if (!mp->audio_format.IsDefined() && chunk->length > 0)
mp->audio_format = chunk->audio_format;
#endif
chunk->next = NULL;
*mp->tail_r = chunk;
mp->tail_r = &chunk->next;
++mp->size;
}
unsigned
music_pipe_size(const struct music_pipe *mp)
{
const ScopeLock protect(mp->mutex);
return mp->size;
}
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