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/*
* Copyright (C) 2003-2009 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.
*/
#ifndef MPD_DECODER_CONTROL_H
#define MPD_DECODER_CONTROL_H
#include "decoder_command.h"
#include "audio_format.h"
#include <glib.h>
#include <assert.h>
enum decoder_state {
DECODE_STATE_STOP = 0,
DECODE_STATE_START,
DECODE_STATE_DECODE,
/**
* The last "START" command failed, because there was an I/O
* error or because no decoder was able to decode the file.
* This state will only come after START; once the state has
* turned to DECODE, by definition no such error can occur.
*/
DECODE_STATE_ERROR,
};
struct decoder_control {
/** the handle of the decoder thread, or NULL if the decoder
thread isn't running */
GThread *thread;
/**
* This lock protects #state and #command.
*/
GMutex *mutex;
/**
* Trigger this object after you have modified #command. This
* is also used by the decoder thread to notify the caller
* when it has finished a command.
*/
GCond *cond;
enum decoder_state state;
enum decoder_command command;
bool quit;
bool seek_error;
bool seekable;
double seek_where;
/** the format of the song file */
struct audio_format in_audio_format;
/** the format being sent to the music pipe */
struct audio_format out_audio_format;
/**
* The song currently being decoded. This attribute is set by
* the player thread, when it sends the #DECODE_COMMAND_START
* command.
*/
const struct song *song;
float total_time;
/** the #music_chunk allocator */
struct music_buffer *buffer;
/** the destination pipe for decoded chunks */
struct music_pipe *pipe;
};
void
dc_init(struct decoder_control *dc);
void
dc_deinit(struct decoder_control *dc);
/**
* Locks the #decoder_control object.
*/
static inline void
decoder_lock(struct decoder_control *dc)
{
g_mutex_lock(dc->mutex);
}
/**
* Unlocks the #decoder_control object.
*/
static inline void
decoder_unlock(struct decoder_control *dc)
{
g_mutex_unlock(dc->mutex);
}
/**
* Waits for a signal on the #decoder_control object. This function
* is only valid in the decoder thread. The object must be locked
* prior to calling this function.
*/
static inline void
decoder_wait(struct decoder_control *dc)
{
g_cond_wait(dc->cond, dc->mutex);
}
/**
* Signals the #decoder_control object. This function is only valid
* in the player thread. The object should be locked prior to calling
* this function.
*/
static inline void
decoder_signal(struct decoder_control *dc)
{
g_cond_signal(dc->cond);
}
static inline bool
decoder_is_idle(const struct decoder_control *dc)
{
return (dc->state == DECODE_STATE_STOP ||
dc->state == DECODE_STATE_ERROR) &&
dc->command != DECODE_COMMAND_START;
}
static inline bool
decoder_is_starting(const struct decoder_control *dc)
{
return dc->command == DECODE_COMMAND_START ||
dc->state == DECODE_STATE_START;
}
static inline bool
decoder_has_failed(const struct decoder_control *dc)
{
assert(dc->command == DECODE_COMMAND_NONE);
return dc->state == DECODE_STATE_ERROR;
}
static inline bool
decoder_lock_is_idle(struct decoder_control *dc)
{
bool ret;
decoder_lock(dc);
ret = decoder_is_idle(dc);
decoder_unlock(dc);
return ret;
}
static inline bool
decoder_lock_is_starting(struct decoder_control *dc)
{
bool ret;
decoder_lock(dc);
ret = decoder_is_starting(dc);
decoder_unlock(dc);
return ret;
}
static inline bool
decoder_lock_has_failed(struct decoder_control *dc)
{
bool ret;
decoder_lock(dc);
ret = decoder_has_failed(dc);
decoder_unlock(dc);
return ret;
}
static inline const struct song *
decoder_current_song(const struct decoder_control *dc)
{
switch (dc->state) {
case DECODE_STATE_STOP:
case DECODE_STATE_ERROR:
return NULL;
case DECODE_STATE_START:
case DECODE_STATE_DECODE:
return dc->song;
}
assert(false);
return NULL;
}
void
dc_command_wait(struct decoder_control *dc);
void
dc_start(struct decoder_control *dc, struct song *song);
void
dc_stop(struct decoder_control *dc);
bool
dc_seek(struct decoder_control *dc, double where);
void
dc_quit(struct decoder_control *dc);
#endif
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