01cf7feac7
Turn the music_pipe into a simple music_chunk queue. The music_chunk allocation code is moved to music_buffer, and is now managed with a linked list instead of a ring buffer. Two separate music_pipe objects are used by the decoder for the "current" and the "next" song, which greatly simplifies the cross-fading code.
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* Copyright (C) 2008 Max Kellermann <max@duempel.org>
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* This project's homepage is: 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef MPD_DECODER_CONTROL_H
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#define MPD_DECODER_CONTROL_H
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#include "decoder_command.h"
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#include "audio_format.h"
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#include "notify.h"
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#include <assert.h>
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#define DECODE_TYPE_FILE 0
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#define DECODE_TYPE_URL 1
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enum decoder_state {
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DECODE_STATE_STOP = 0,
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DECODE_STATE_START,
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DECODE_STATE_DECODE,
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/**
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* The last "START" command failed, because there was an I/O
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* error or because no decoder was able to decode the file.
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* This state will only come after START; once the state has
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* turned to DECODE, by definition no such error can occur.
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*/
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DECODE_STATE_ERROR,
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};
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struct decoder_control {
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/** the handle of the decoder thread, or NULL if the decoder
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thread isn't running */
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GThread *thread;
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struct notify notify;
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volatile enum decoder_state state;
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volatile enum decoder_command command;
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bool quit;
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bool seek_error;
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bool seekable;
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volatile double seek_where;
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/** the format of the song file */
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struct audio_format in_audio_format;
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/** the format being sent to the music pipe */
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struct audio_format out_audio_format;
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struct song *current_song;
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struct song *next_song;
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float total_time;
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/** the #music_chunk allocator */
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struct music_buffer *buffer;
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/** the destination pipe for decoded chunks */
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struct music_pipe *pipe;
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};
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extern struct decoder_control dc;
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void dc_init(void);
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void dc_deinit(void);
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static inline bool decoder_is_idle(void)
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{
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return (dc.state == DECODE_STATE_STOP ||
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dc.state == DECODE_STATE_ERROR) &&
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dc.command != DECODE_COMMAND_START;
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}
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static inline bool decoder_is_starting(void)
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{
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return dc.command == DECODE_COMMAND_START ||
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dc.state == DECODE_STATE_START;
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}
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static inline bool decoder_has_failed(void)
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{
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assert(dc.command == DECODE_COMMAND_NONE);
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return dc.state == DECODE_STATE_ERROR;
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}
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static inline struct song *
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decoder_current_song(void)
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{
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switch (dc.state) {
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case DECODE_STATE_STOP:
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case DECODE_STATE_ERROR:
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return NULL;
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case DECODE_STATE_START:
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case DECODE_STATE_DECODE:
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return dc.current_song;
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}
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assert(false);
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return NULL;
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}
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void
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dc_command_wait(struct notify *notify);
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void
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dc_start(struct notify *notify, struct song *song);
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void
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dc_start_async(struct song *song);
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void
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dc_stop(struct notify *notify);
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bool
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dc_seek(struct notify *notify, double where);
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void
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dc_quit(void);
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#endif
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