/* * Copyright (C) 2003-2010 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. The caller thread * owns this object, and is responsible for freeing it. */ 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; } static inline bool decoder_is_starting(const struct decoder_control *dc) { return 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); /** * Start the decoder. * * @param the decoder * @param song the song to be decoded * @param pipe the pipe which receives the decoded chunks (owned by * the caller) */ void dc_start(struct decoder_control *dc, struct song *song, struct music_buffer *buffer, struct music_pipe *pipe); void dc_stop(struct decoder_control *dc); bool dc_seek(struct decoder_control *dc, double where); void dc_quit(struct decoder_control *dc); #endif