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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pipe.h"
#include "chunk.h"
#include "notify.h"
#include "audio_format.h"
#include "tag.h"
#include <glib.h>
#include <assert.h>
#include <string.h>
struct music_pipe music_pipe;
void
music_pipe_init(unsigned int size, struct notify *notify)
{
assert(size > 0);
music_pipe.chunks = g_new(struct music_chunk, size);
music_pipe.num_chunks = size;
music_pipe.begin = 0;
music_pipe.end = 0;
music_pipe.lazy = false;
music_pipe.notify = notify;
music_chunk_init(&music_pipe.chunks[0]);
}
void music_pipe_free(void)
{
assert(music_pipe.chunks != NULL);
music_pipe_clear();
g_free(music_pipe.chunks);
}
/** return the index of the chunk after i */
static inline unsigned successor(unsigned i)
{
assert(i < music_pipe.num_chunks);
++i;
return i == music_pipe.num_chunks ? 0 : i;
}
void music_pipe_clear(void)
{
unsigned i;
for (i = music_pipe.begin; i != music_pipe.end; i = successor(i))
music_chunk_free(&music_pipe.chunks[i]);
music_chunk_free(&music_pipe.chunks[music_pipe.end]);
music_pipe.end = music_pipe.begin;
music_chunk_init(&music_pipe.chunks[music_pipe.end]);
}
/**
* Mark the tail chunk as "full" and wake up the player if is waiting
* for the decoder.
*/
static void output_buffer_expand(unsigned i)
{
int was_empty = music_pipe.notify != NULL && (!music_pipe.lazy || music_pipe_is_empty());
assert(i == (music_pipe.end + 1) % music_pipe.num_chunks);
assert(i != music_pipe.end);
music_pipe.end = i;
music_chunk_init(&music_pipe.chunks[i]);
if (was_empty)
/* if the buffer was empty, the player thread might be
waiting for us; wake it up now that another decoded
buffer has become available. */
notify_signal(music_pipe.notify);
}
void music_pipe_set_lazy(bool lazy)
{
music_pipe.lazy = lazy;
}
void music_pipe_shift(void)
{
assert(music_pipe.begin != music_pipe.end);
assert(music_pipe.begin < music_pipe.num_chunks);
music_chunk_free(&music_pipe.chunks[music_pipe.begin]);
music_pipe.begin = successor(music_pipe.begin);
}
unsigned int music_pipe_relative(const unsigned i)
{
if (i >= music_pipe.begin)
return i - music_pipe.begin;
else
return i + music_pipe.num_chunks - music_pipe.begin;
}
unsigned music_pipe_available(void)
{
return music_pipe_relative(music_pipe.end);
}
int music_pipe_absolute(const unsigned relative)
{
unsigned i, max;
max = music_pipe.end;
if (max < music_pipe.begin)
max += music_pipe.num_chunks;
i = (unsigned)music_pipe.begin + relative;
if (i >= max)
return -1;
if (i >= music_pipe.num_chunks)
i -= music_pipe.num_chunks;
return (int)i;
}
struct music_chunk *
music_pipe_get_chunk(const unsigned i)
{
assert(i < music_pipe.num_chunks);
return &music_pipe.chunks[i];
}
struct music_chunk *
music_pipe_allocate(void)
{
struct music_chunk *chunk;
/* the music_pipe.end chunk is always kept initialized */
chunk = music_pipe_get_chunk(music_pipe.end);
assert(chunk->length == 0);
return chunk;
}
bool
music_pipe_push(struct music_chunk *chunk)
{
unsigned int next;
assert(chunk == music_pipe_get_chunk(music_pipe.end));
next = successor(music_pipe.end);
if (music_pipe.begin == next)
/* no room */
return false;
output_buffer_expand(next);
return true;
}
void
music_pipe_cancel(struct music_chunk *chunk)
{
assert(chunk == music_pipe_get_chunk(music_pipe.end));
music_chunk_free(chunk);
}
void music_pipe_skip(unsigned num)
{
int i = music_pipe_absolute(num);
if (i < 0)
return;
while (music_pipe.begin != (unsigned)i)
music_pipe_shift();
}
void music_pipe_chop(unsigned first)
{
for (unsigned i = first; i != music_pipe.end; i = successor(i))
music_chunk_free(&music_pipe.chunks[i]);
music_chunk_free(&music_pipe.chunks[music_pipe.end]);
music_pipe.end = first;
music_chunk_init(&music_pipe.chunks[first]);
}
#ifndef NDEBUG
void music_pipe_check_format(const struct audio_format *current,
int next_index, const struct audio_format *next)
{
const struct audio_format *audio_format = current;
for (unsigned i = music_pipe.begin; i != music_pipe.end;
i = successor(i)) {
const struct music_chunk *chunk = music_pipe_get_chunk(i);
if (next_index > 0 && i == (unsigned)next_index)
audio_format = next;
assert(chunk->length % audio_format_frame_size(audio_format) == 0);
}
}
#endif
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