481 lines
12 KiB
C
481 lines
12 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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* 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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#include "player_thread.h"
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#include "playerData.h"
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#include "audio.h"
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#include "pcm_utils.h"
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#include "path.h"
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#include "log.h"
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#include "main_notify.h"
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#include "crossfade.h"
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enum xfade_state {
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XFADE_DISABLED = -1,
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XFADE_UNKNOWN = 0,
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XFADE_ENABLED = 1
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};
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static void dc_command_wait(void)
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{
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while (dc.command != DECODE_COMMAND_NONE) {
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notify_signal(&dc.notify);
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notify_wait(&pc.notify);
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}
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}
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static void dc_command(enum decoder_command cmd)
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{
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dc.command = cmd;
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dc_command_wait();
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}
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static void stopDecode(void)
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{
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if (dc.command == DECODE_COMMAND_START ||
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dc.state != DECODE_STATE_STOP)
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dc_command(DECODE_COMMAND_STOP);
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}
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static void quitDecode(void)
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{
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stopDecode();
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pc.state = PLAYER_STATE_STOP;
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dc.command = DECODE_COMMAND_NONE;
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pc.command = PLAYER_COMMAND_NONE;
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wakeup_main_task();
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}
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static int waitOnDecode(int *decodeWaitedOn)
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{
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while (dc.command == DECODE_COMMAND_START) {
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notify_signal(&dc.notify);
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notify_wait(&pc.notify);
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}
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if (dc.error != DECODE_ERROR_NOERROR) {
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assert(dc.next_song == NULL || dc.next_song->url != NULL);
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pc.errored_song = dc.next_song;
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pc.error = PLAYER_ERROR_FILE;
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return -1;
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}
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pc.totalTime = pc.fileTime;
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pc.bitRate = 0;
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pc.sampleRate = 0;
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pc.bits = 0;
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pc.channels = 0;
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*decodeWaitedOn = 1;
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return 0;
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}
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static int decodeSeek(int *decodeWaitedOn, int *next)
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{
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int ret = -1;
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if (dc.state == DECODE_STATE_STOP ||
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dc.error != DECODE_ERROR_NOERROR ||
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dc.current_song != pc.next_song) {
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stopDecode();
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*next = -1;
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ob_clear();
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dc.next_song = pc.next_song;
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dc.error = DECODE_ERROR_NOERROR;
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dc.command = DECODE_COMMAND_START;
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waitOnDecode(decodeWaitedOn);
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}
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if (dc.state != DECODE_STATE_STOP && dc.seekable) {
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*next = -1;
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dc.seekWhere = pc.seekWhere > pc.totalTime - 0.1 ?
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pc.totalTime - 0.1 : pc.seekWhere;
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dc.seekWhere = 0 > dc.seekWhere ? 0 : dc.seekWhere;
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dc.seekError = 0;
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dc_command(DECODE_COMMAND_SEEK);
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if (!dc.seekError) {
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pc.elapsedTime = dc.seekWhere;
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ret = 0;
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}
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}
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player_command_finished();
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return ret;
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}
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static void processDecodeInput(int *pause_r, unsigned int *bbp_r,
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enum xfade_state *do_xfade_r,
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int *decodeWaitedOn_r,
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int *next_r)
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{
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switch (pc.command) {
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case PLAYER_COMMAND_NONE:
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case PLAYER_COMMAND_PLAY:
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case PLAYER_COMMAND_STOP:
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case PLAYER_COMMAND_EXIT:
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case PLAYER_COMMAND_CLOSE_AUDIO:
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break;
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case PLAYER_COMMAND_LOCK_QUEUE:
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pc.queueLockState = PLAYER_QUEUE_LOCKED;
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player_command_finished();
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break;
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case PLAYER_COMMAND_UNLOCK_QUEUE:
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pc.queueLockState = PLAYER_QUEUE_UNLOCKED;
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player_command_finished();
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break;
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case PLAYER_COMMAND_PAUSE:
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*pause_r = !*pause_r;
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if (*pause_r) {
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pc.state = PLAYER_STATE_PAUSE;
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} else {
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if (openAudioDevice(NULL) >= 0) {
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pc.state = PLAYER_STATE_PLAY;
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} else {
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char tmp[MPD_PATH_MAX];
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assert(dc.next_song == NULL || dc.next_song->url != NULL);
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pc.errored_song = dc.next_song;
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pc.error = PLAYER_ERROR_AUDIO;
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ERROR("problems opening audio device "
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"while playing \"%s\"\n",
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get_song_url(tmp, dc.next_song));
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*pause_r = -1;
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}
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}
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player_command_finished();
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if (*pause_r == -1) {
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*pause_r = 1;
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} else if (*pause_r) {
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dropBufferedAudio();
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closeAudioDevice();
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}
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break;
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case PLAYER_COMMAND_SEEK:
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dropBufferedAudio();
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if (decodeSeek(decodeWaitedOn_r, next_r) == 0) {
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*do_xfade_r = XFADE_UNKNOWN;
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*bbp_r = 0;
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}
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break;
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}
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}
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static int playChunk(ob_chunk * chunk,
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const AudioFormat * format, double sizeToTime)
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{
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pc.elapsedTime = chunk->times;
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pc.bitRate = chunk->bitRate;
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pcm_volumeChange(chunk->data, chunk->chunkSize,
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format, pc.softwareVolume);
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if (playAudio(chunk->data,
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chunk->chunkSize) < 0)
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return -1;
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pc.totalPlayTime += sizeToTime * chunk->chunkSize;
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return 0;
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}
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static void decodeParent(void)
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{
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int do_pause = 0;
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int buffering = 1;
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unsigned int bbp = buffered_before_play;
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enum xfade_state do_xfade = XFADE_UNKNOWN;
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unsigned int crossFadeChunks = 0;
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/** the position of the next cross-faded chunk in the next
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song */
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int nextChunk = 0;
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int decodeWaitedOn = 0;
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static const char silence[CHUNK_SIZE];
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double sizeToTime = 0.0;
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/** the position of the first chunk in the next song */
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int next = -1;
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ob_set_lazy(0);
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if (waitOnDecode(&decodeWaitedOn) < 0) {
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quitDecode();
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return;
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}
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pc.elapsedTime = 0;
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pc.state = PLAYER_STATE_PLAY;
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player_command_finished();
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while (1) {
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processDecodeInput(&do_pause, &bbp, &do_xfade,
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&decodeWaitedOn, &next);
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if (pc.command == PLAYER_COMMAND_STOP ||
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pc.command == PLAYER_COMMAND_EXIT ||
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pc.command == PLAYER_COMMAND_CLOSE_AUDIO) {
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dropBufferedAudio();
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break;
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}
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if (buffering) {
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if (ob_available() < bbp) {
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/* not enough decoded buffer space yet */
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notify_wait(&pc.notify);
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continue;
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} else {
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/* buffering is complete */
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buffering = 0;
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ob_set_lazy(1);
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}
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}
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if (decodeWaitedOn) {
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if(dc.state!=DECODE_STATE_START &&
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dc.error==DECODE_ERROR_NOERROR) {
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/* the decoder is ready and ok */
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decodeWaitedOn = 0;
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if(openAudioDevice(&(ob.audioFormat))<0) {
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char tmp[MPD_PATH_MAX];
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assert(dc.next_song == NULL || dc.next_song->url != NULL);
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pc.errored_song = dc.next_song;
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pc.error = PLAYER_ERROR_AUDIO;
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ERROR("problems opening audio device "
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"while playing \"%s\"\n",
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get_song_url(tmp, dc.next_song));
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break;
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}
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if (do_pause) {
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dropBufferedAudio();
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closeAudioDevice();
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}
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pc.totalTime = dc.totalTime;
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pc.sampleRate = dc.audioFormat.sampleRate;
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pc.bits = dc.audioFormat.bits;
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pc.channels = dc.audioFormat.channels;
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sizeToTime = audioFormatSizeToTime(&ob.audioFormat);
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}
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else if(dc.state!=DECODE_STATE_START) {
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/* the decoder failed */
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assert(dc.next_song == NULL || dc.next_song->url != NULL);
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pc.errored_song = dc.next_song;
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pc.error = PLAYER_ERROR_FILE;
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break;
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}
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else {
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/* the decoder is not yet ready; wait
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some more */
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notify_wait(&pc.notify);
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continue;
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}
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}
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if (dc.state == DECODE_STATE_STOP &&
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pc.queueState == PLAYER_QUEUE_FULL &&
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pc.queueLockState == PLAYER_QUEUE_UNLOCKED) {
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/* the decoder has finished the current song;
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make it decode the next song */
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next = ob.end;
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dc.next_song = pc.next_song;
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dc.error = DECODE_ERROR_NOERROR;
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dc.command = DECODE_COMMAND_START;
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pc.queueState = PLAYER_QUEUE_DECODE;
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wakeup_main_task();
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notify_signal(&dc.notify);
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}
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if (next >= 0 && do_xfade == XFADE_UNKNOWN &&
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dc.command != DECODE_COMMAND_START &&
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dc.state != DECODE_STATE_START) {
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/* enable cross fading in this song? if yes,
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calculate how many chunks will be required
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for it */
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crossFadeChunks =
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cross_fade_calc(pc.crossFade, dc.totalTime,
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&(ob.audioFormat),
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ob.size -
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buffered_before_play);
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if (crossFadeChunks > 0) {
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do_xfade = XFADE_ENABLED;
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nextChunk = -1;
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} else
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/* cross fading is disabled or the
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next song is too short */
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do_xfade = XFADE_DISABLED;
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}
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if (do_pause)
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notify_wait(&pc.notify);
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else if (!ob_is_empty() && (int)ob.begin != next) {
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ob_chunk *beginChunk = ob_get_chunk(ob.begin);
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unsigned int fadePosition;
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if (do_xfade == XFADE_ENABLED && next >= 0 &&
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(fadePosition = ob_relative(next))
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<= crossFadeChunks) {
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/* perform cross fade */
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if (nextChunk < 0) {
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/* beginning of the cross fade
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- adjust crossFadeChunks
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which might be bigger than
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the remaining number of
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chunks in the old song */
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crossFadeChunks = fadePosition;
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}
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nextChunk = ob_absolute(crossFadeChunks);
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if (nextChunk >= 0) {
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ob_set_lazy(1);
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cross_fade_apply(beginChunk,
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ob_get_chunk(nextChunk),
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&(ob.audioFormat),
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fadePosition,
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crossFadeChunks);
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} else {
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/* there are not enough
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decoded chunks yet */
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if (dc.state == DECODE_STATE_STOP) {
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/* the decoder isn't
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running, abort
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cross fading */
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do_xfade = XFADE_DISABLED;
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} else {
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/* wait for the
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decoder */
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ob_set_lazy(0);
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notify_wait(&pc.notify);
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continue;
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}
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}
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}
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/* play the current chunk */
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if (playChunk(beginChunk, &(ob.audioFormat),
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sizeToTime) < 0)
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break;
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ob_shift();
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notify_signal(&dc.notify);
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} else if (!ob_is_empty() && (int)ob.begin == next) {
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/* at the beginning of a new song */
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if (do_xfade == XFADE_ENABLED && nextChunk >= 0) {
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/* the cross-fade is finished; skip
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the section which was cross-faded
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(and thus already played) */
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ob_skip(crossFadeChunks);
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}
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do_xfade = XFADE_UNKNOWN;
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/* wait for a signal from the playlist */
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if (pc.queueState == PLAYER_QUEUE_DECODE ||
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pc.queueLockState == PLAYER_QUEUE_LOCKED) {
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notify_wait(&pc.notify);
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continue;
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}
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if (pc.queueState != PLAYER_QUEUE_PLAY)
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break;
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next = -1;
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if (waitOnDecode(&decodeWaitedOn) < 0)
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return;
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pc.queueState = PLAYER_QUEUE_EMPTY;
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wakeup_main_task();
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} else if (dc.state == DECODE_STATE_STOP &&
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dc.command != DECODE_COMMAND_START) {
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break;
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} else {
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/*DEBUG("waiting for decoded audio, play silence\n");*/
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if (playAudio(silence, CHUNK_SIZE) < 0)
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break;
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}
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}
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quitDecode();
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}
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/* decode w/ buffering
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* this will fork another process
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* child process does decoding
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* parent process does playing audio
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*/
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static void decode(void)
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{
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ob_clear();
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dc.next_song = pc.next_song;
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dc.error = DECODE_ERROR_NOERROR;
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dc_command(DECODE_COMMAND_START);
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decodeParent();
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}
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static void * player_task(mpd_unused void *arg)
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{
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notify_enter(&pc.notify);
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while (1) {
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switch (pc.command) {
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case PLAYER_COMMAND_PLAY:
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decode();
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break;
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case PLAYER_COMMAND_STOP:
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case PLAYER_COMMAND_SEEK:
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case PLAYER_COMMAND_PAUSE:
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player_command_finished();
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break;
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case PLAYER_COMMAND_CLOSE_AUDIO:
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closeAudioDevice();
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player_command_finished();
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break;
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case PLAYER_COMMAND_EXIT:
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closeAudioDevice();
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player_command_finished();
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pthread_exit(NULL);
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break;
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case PLAYER_COMMAND_LOCK_QUEUE:
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pc.queueLockState = PLAYER_QUEUE_LOCKED;
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player_command_finished();
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break;
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case PLAYER_COMMAND_UNLOCK_QUEUE:
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pc.queueLockState = PLAYER_QUEUE_UNLOCKED;
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player_command_finished();
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break;
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case PLAYER_COMMAND_NONE:
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notify_wait(&pc.notify);
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break;
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}
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}
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return NULL;
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}
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void player_create(void)
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{
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pthread_attr_t attr;
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pthread_t player_thread;
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pthread_attr_init(&attr);
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pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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if (pthread_create(&player_thread, &attr, player_task, NULL))
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FATAL("Failed to spawn player task: %s\n", strerror(errno));
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}
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