moved code to player_thread.c

Move code which runs in the player thread to player_thread.c.  Having
a lot of player thread code in decode.c isn't easy to understand.

1 files changed, 466 insertions, 0 deletions

diff --git a/src/player_thread.c b/src/player_thread.c
new file mode 100644
index 000000000..0937fb3ca
--- /dev/null
+++ b/src/player_thread.c
@@ -0,0 +1,466 @@
+/* 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 "player_thread.h"
+#include "playerData.h"
+#include "audio.h"
+#include "pcm_utils.h"
+#include "path.h"
+#include "log.h"
+#include "main_notify.h"
+#include "crossfade.h"
+
+enum xfade_state {
+	XFADE_DISABLED = -1,
+	XFADE_UNKNOWN = 0,
+	XFADE_ENABLED = 1
+};
+
+static void dc_command_wait(void)
+{
+	while (dc.command != DECODE_COMMAND_NONE) {
+		notify_signal(&dc.notify);
+		notify_wait(&pc.notify);
+	}
+}
+
+static void dc_command(enum decoder_command cmd)
+{
+	dc.command = cmd;
+	dc_command_wait();
+}
+
+static void stopDecode(void)
+{
+	if (dc.command == DECODE_COMMAND_START ||
+	    dc.state != DECODE_STATE_STOP)
+		dc_command(DECODE_COMMAND_STOP);
+}
+
+static void quitDecode(void)
+{
+	stopDecode();
+	pc.state = PLAYER_STATE_STOP;
+	dc.command = DECODE_COMMAND_NONE;
+	pc.command = PLAYER_COMMAND_NONE;
+	wakeup_main_task();
+}
+
+static int waitOnDecode(int *decodeWaitedOn)
+{
+	while (dc.command == DECODE_COMMAND_START) {
+		notify_signal(&dc.notify);
+		notify_wait(&pc.notify);
+	}
+
+	if (dc.error != DECODE_ERROR_NOERROR) {
+		pc.errored_song = dc.next_song;
+		pc.error = PLAYER_ERROR_FILE;
+		quitDecode();
+		return -1;
+	}
+
+	pc.totalTime = pc.fileTime;
+	pc.bitRate = 0;
+	pc.sampleRate = 0;
+	pc.bits = 0;
+	pc.channels = 0;
+	*decodeWaitedOn = 1;
+
+	return 0;
+}
+
+static int decodeSeek(int *decodeWaitedOn, int *next)
+{
+	int ret = -1;
+
+	if (dc.state == DECODE_STATE_STOP ||
+	    dc.error != DECODE_ERROR_NOERROR ||
+	    dc.current_song != pc.next_song) {
+		stopDecode();
+		*next = -1;
+		ob_clear();
+		dc.next_song = pc.next_song;
+		dc.error = DECODE_ERROR_NOERROR;
+		dc.command = DECODE_COMMAND_START;
+		waitOnDecode(decodeWaitedOn);
+	}
+	if (dc.state != DECODE_STATE_STOP && dc.seekable) {
+		*next = -1;
+		dc.seekWhere = pc.seekWhere > pc.totalTime - 0.1 ?
+		    pc.totalTime - 0.1 : pc.seekWhere;
+		dc.seekWhere = 0 > dc.seekWhere ? 0 : dc.seekWhere;
+		dc.seekError = 0;
+		dc_command(DECODE_COMMAND_SEEK);
+		if (!dc.seekError) {
+			pc.elapsedTime = dc.seekWhere;
+			ret = 0;
+		}
+	}
+
+	player_command_finished();
+
+	return ret;
+}
+
+static void processDecodeInput(int *pause_r, unsigned int *bbp_r,
+			       enum xfade_state *do_xfade_r,
+			       int *decodeWaitedOn_r,
+			       int *next_r)
+{
+	switch (pc.command) {
+	case PLAYER_COMMAND_NONE:
+	case PLAYER_COMMAND_PLAY:
+	case PLAYER_COMMAND_STOP:
+	case PLAYER_COMMAND_CLOSE_AUDIO:
+		break;
+
+	case PLAYER_COMMAND_LOCK_QUEUE:
+		pc.queueLockState = PLAYER_QUEUE_LOCKED;
+		player_command_finished();
+		break;
+
+	case PLAYER_COMMAND_UNLOCK_QUEUE:
+		pc.queueLockState = PLAYER_QUEUE_UNLOCKED;
+		player_command_finished();
+		break;
+
+	case PLAYER_COMMAND_PAUSE:
+		*pause_r = !*pause_r;
+		if (*pause_r) {
+			pc.state = PLAYER_STATE_PAUSE;
+		} else {
+			if (openAudioDevice(NULL) >= 0) {
+				pc.state = PLAYER_STATE_PLAY;
+			} else {
+				char tmp[MPD_PATH_MAX];
+				pc.errored_song = dc.next_song;
+				pc.error = PLAYER_ERROR_AUDIO;
+				ERROR("problems opening audio device "
+				      "while playing \"%s\"\n",
+				      get_song_url(tmp, dc.next_song));
+				*pause_r = -1;
+			}
+		}
+		player_command_finished();
+		if (*pause_r == -1) {
+			*pause_r = 1;
+		} else if (*pause_r) {
+			dropBufferedAudio();
+			closeAudioDevice();
+		}
+		break;
+
+	case PLAYER_COMMAND_SEEK:
+		dropBufferedAudio();
+		if (decodeSeek(decodeWaitedOn_r, next_r) == 0) {
+			*do_xfade_r = XFADE_UNKNOWN;
+			*bbp_r = 0;
+		}
+		break;
+	}
+}
+
+static int playChunk(ob_chunk * chunk,
+		     const AudioFormat * format, double sizeToTime)
+{
+	pc.elapsedTime = chunk->times;
+	pc.bitRate = chunk->bitRate;
+
+	pcm_volumeChange(chunk->data, chunk->chunkSize,
+			 format, pc.softwareVolume);
+
+	if (playAudio(chunk->data,
+		      chunk->chunkSize) < 0)
+		return -1;
+
+	pc.totalPlayTime += sizeToTime * chunk->chunkSize;
+	return 0;
+}
+
+static void decodeParent(void)
+{
+	int do_pause = 0;
+	int buffering = 1;
+	unsigned int bbp = buffered_before_play;
+	enum xfade_state do_xfade = XFADE_UNKNOWN;
+	unsigned int crossFadeChunks = 0;
+	/** the position of the next cross-faded chunk in the next
+	    song */
+	int nextChunk = 0;
+	int decodeWaitedOn = 0;
+	static const char silence[CHUNK_SIZE];
+	double sizeToTime = 0.0;
+	/** the position of the first chunk in the next song */
+	int next = -1;
+
+	ob_set_lazy(0);
+
+	if (waitOnDecode(&decodeWaitedOn) < 0)
+		return;
+
+	pc.elapsedTime = 0;
+	pc.state = PLAYER_STATE_PLAY;
+	player_command_finished();
+
+	while (1) {
+		processDecodeInput(&do_pause, &bbp, &do_xfade,
+				   &decodeWaitedOn, &next);
+		if (pc.command == PLAYER_COMMAND_STOP) {
+			dropBufferedAudio();
+			break;
+		}
+
+		if (buffering) {
+			if (ob_available() < bbp) {
+				/* not enough decoded buffer space yet */
+				notify_wait(&pc.notify);
+				continue;
+			} else {
+				/* buffering is complete */
+				buffering = 0;
+				ob_set_lazy(1);
+			}
+		}
+
+		if (decodeWaitedOn) {
+			if(dc.state!=DECODE_STATE_START &&
+			   dc.error==DECODE_ERROR_NOERROR) {
+				/* the decoder is ready and ok */
+				decodeWaitedOn = 0;
+				if(openAudioDevice(&(ob.audioFormat))<0) {
+					char tmp[MPD_PATH_MAX];
+					pc.errored_song = dc.next_song;
+					pc.error = PLAYER_ERROR_AUDIO;
+					ERROR("problems opening audio device "
+					      "while playing \"%s\"\n",
+					      get_song_url(tmp, dc.next_song));
+					break;
+				}
+
+				if (do_pause) {
+					dropBufferedAudio();
+					closeAudioDevice();
+				}
+				pc.totalTime = dc.totalTime;
+				pc.sampleRate = dc.audioFormat.sampleRate;
+				pc.bits = dc.audioFormat.bits;
+				pc.channels = dc.audioFormat.channels;
+				sizeToTime = audioFormatSizeToTime(&ob.audioFormat);
+			}
+			else if(dc.state!=DECODE_STATE_START) {
+				/* the decoder failed */
+				pc.errored_song = dc.next_song;
+				pc.error = PLAYER_ERROR_FILE;
+				break;
+			}
+			else {
+				/* the decoder is not yet ready; wait
+				   some more */
+				notify_wait(&pc.notify);
+				continue;
+			}
+		}
+
+		if (dc.state == DECODE_STATE_STOP &&
+		    pc.queueState == PLAYER_QUEUE_FULL &&
+		    pc.queueLockState == PLAYER_QUEUE_UNLOCKED) {
+			/* the decoder has finished the current song;
+			   make it decode the next song */
+			next = ob.end;
+			dc.next_song = pc.next_song;
+			dc.error = DECODE_ERROR_NOERROR;
+			dc.command = DECODE_COMMAND_START;
+			pc.queueState = PLAYER_QUEUE_DECODE;
+			wakeup_main_task();
+			notify_signal(&dc.notify);
+		}
+		if (next >= 0 && do_xfade == XFADE_UNKNOWN &&
+		    dc.command != DECODE_COMMAND_START &&
+		    dc.state != DECODE_STATE_START) {
+			/* enable cross fading in this song?  if yes,
+			   calculate how many chunks will be required
+			   for it */
+			crossFadeChunks =
+				cross_fade_calc(pc.crossFade, dc.totalTime,
+						&(ob.audioFormat),
+						ob.size -
+						buffered_before_play);
+			if (crossFadeChunks > 0) {
+				do_xfade = XFADE_ENABLED;
+				nextChunk = -1;
+			} else
+				/* cross fading is disabled or the
+				   next song is too short */
+				do_xfade = XFADE_DISABLED;
+		}
+
+		if (do_pause)
+			notify_wait(&pc.notify);
+		else if (!ob_is_empty() && (int)ob.begin != next) {
+			ob_chunk *beginChunk = ob_get_chunk(ob.begin);
+			unsigned int fadePosition;
+			if (do_xfade == XFADE_ENABLED && next >= 0 &&
+			    (fadePosition = ob_relative(next))
+			    <= crossFadeChunks) {
+				/* perform cross fade */
+				if (nextChunk < 0) {
+					/* beginning of the cross fade
+					   - adjust crossFadeChunks
+					   which might be bigger than
+					   the remaining number of
+					   chunks in the old song */
+					crossFadeChunks = fadePosition;
+				}
+				nextChunk = ob_absolute(crossFadeChunks);
+				if (nextChunk >= 0) {
+					ob_set_lazy(1);
+					cross_fade_apply(beginChunk,
+							 ob_get_chunk(nextChunk),
+							 &(ob.audioFormat),
+							 fadePosition,
+							 crossFadeChunks);
+				} else {
+					/* there are not enough
+					   decoded chunks yet */
+					if (dc.state == DECODE_STATE_STOP) {
+						/* the decoder isn't
+						   running, abort
+						   cross fading */
+						do_xfade = XFADE_DISABLED;
+					} else {
+						/* wait for the
+						   decoder */
+						ob_set_lazy(0);
+						notify_wait(&pc.notify);
+						continue;
+					}
+				}
+			}
+
+			/* play the current chunk */
+			if (playChunk(beginChunk, &(ob.audioFormat),
+				      sizeToTime) < 0)
+				break;
+			ob_shift();
+			notify_signal(&dc.notify);
+		} else if (!ob_is_empty() && (int)ob.begin == next) {
+			/* at the beginning of a new song */
+
+			if (do_xfade == XFADE_ENABLED && nextChunk >= 0) {
+				/* the cross-fade is finished; skip
+				   the section which was cross-faded
+				   (and thus already played) */
+				ob_skip(crossFadeChunks);
+			}
+
+			do_xfade = XFADE_UNKNOWN;
+
+			/* wait for the decoder to work on the new song */
+			if (pc.queueState == PLAYER_QUEUE_DECODE ||
+			    pc.queueLockState == PLAYER_QUEUE_LOCKED) {
+				notify_wait(&pc.notify);
+				continue;
+			}
+			if (pc.queueState != PLAYER_QUEUE_PLAY)
+				break;
+
+			next = -1;
+			if (waitOnDecode(&decodeWaitedOn) < 0)
+				return;
+
+			pc.queueState = PLAYER_QUEUE_EMPTY;
+			wakeup_main_task();
+		} else if (dc.state == DECODE_STATE_STOP &&
+			   dc.command != DECODE_COMMAND_START) {
+			break;
+		} else {
+			/*DEBUG("waiting for decoded audio, play silence\n");*/
+			if (playAudio(silence, CHUNK_SIZE) < 0)
+				break;
+		}
+	}
+
+	quitDecode();
+}
+
+/* decode w/ buffering
+ * this will fork another process
+ * child process does decoding
+ * parent process does playing audio
+ */
+static void decode(void)
+{
+	ob_clear();
+
+	dc.next_song = pc.next_song;
+	dc.error = DECODE_ERROR_NOERROR;
+	dc_command(DECODE_COMMAND_START);
+
+	decodeParent();
+}
+
+static void * player_task(mpd_unused void *arg)
+{
+	notify_enter(&pc.notify);
+
+	while (1) {
+		switch (pc.command) {
+		case PLAYER_COMMAND_PLAY:
+			decode();
+			break;
+
+		case PLAYER_COMMAND_STOP:
+		case PLAYER_COMMAND_SEEK:
+		case PLAYER_COMMAND_PAUSE:
+			player_command_finished();
+			break;
+
+		case PLAYER_COMMAND_CLOSE_AUDIO:
+			closeAudioDevice();
+			player_command_finished();
+			break;
+
+		case PLAYER_COMMAND_LOCK_QUEUE:
+			pc.queueLockState = PLAYER_QUEUE_LOCKED;
+			player_command_finished();
+			break;
+
+		case PLAYER_COMMAND_UNLOCK_QUEUE:
+			pc.queueLockState = PLAYER_QUEUE_UNLOCKED;
+			player_command_finished();
+			break;
+
+		case PLAYER_COMMAND_NONE:
+			notify_wait(&pc.notify);
+			break;
+		}
+	}
+	return NULL;
+}
+
+void player_create(void)
+{
+	pthread_attr_t attr;
+	pthread_t player_thread;
+
+	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+	if (pthread_create(&player_thread, &attr, player_task, NULL))
+		FATAL("Failed to spawn player task: %s\n", strerror(errno));
+}