From 46b59017ffcc85505cf5f8b98f2ae226121d8a16 Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <PromyLOPh@lavabit.com>
Date: Fri, 30 Jan 2009 23:25:36 +0100
Subject: Use pthread mutex to block player in pause state

---
 src/player.c | 17 ++++++++---------
 src/player.h |  3 ++-
 src/ui_act.c | 28 ++++++++++++++++++++--------
 3 files changed, 30 insertions(+), 18 deletions(-)

(limited to 'src')

diff --git a/src/player.c b/src/player.c
index b7526e4..7482cc0 100644
--- a/src/player.c
+++ b/src/player.c
@@ -34,18 +34,13 @@ THE SOFTWARE.
 #define byteswap32(x) (((x >> 24) & 0x000000ff) | ((x >> 8) & 0x0000ff00) | \
 		((x << 8) & 0x00ff0000) | ((x << 24) & 0xff000000))
 
-/* FIXME: not the best solution to poll every second, but the easiest
- * one I know... (pthread's conditions could be another solution) */
+/* wait while locked, but don't slow down main thread by keeping
+* locks too long */
 #define QUIT_PAUSE_CHECK \
+	pthread_mutex_lock (&player->pauseMutex); \
+	pthread_mutex_unlock (&player->pauseMutex); \
 	if (player->doQuit) { \
 		return 0; \
-	} \
-	if (player->doPause) { \
-		curl_easy_pause (player->audioFd, CURLPAUSE_ALL); \
-		while (player->doPause && !player->doQuit) { \
-			sleep (1); \
-		} \
-		curl_easy_pause (player->audioFd, CURLPAUSE_CONT); \
 	}
 
 /*	compute replaygain scale factor
@@ -225,6 +220,8 @@ size_t BarPlayerCurlCb (void *ptr, size_t size, size_t nmemb, void *stream) {
 			(player->bufferFilled - player->bufferRead));
 	player->bufferFilled = (player->bufferFilled - player->bufferRead);
 
+	pthread_mutex_unlock (&player->pauseMutex);
+
 	return size*nmemb;
 }
 
@@ -239,6 +236,7 @@ void *BarPlayerThread (void *data) {
 	CURLcode curlRet = 0;
 
 	/* init handles */
+	pthread_mutex_init (&player->pauseMutex, NULL);
 	player->audioFd = curl_easy_init ();
 	player->aacHandle = NeAACDecOpen();
 	
@@ -279,6 +277,7 @@ void *BarPlayerThread (void *data) {
 	if (player->sampleSize != NULL) {
 		free (player->sampleSize);
 	}
+	pthread_mutex_destroy (&player->pauseMutex);
 
 	player->mode = PLAYER_FINISHED_PLAYBACK;
 
diff --git a/src/player.h b/src/player.h
index c210c09..7756d0a 100644
--- a/src/player.h
+++ b/src/player.h
@@ -27,6 +27,7 @@ THE SOFTWARE.
 #include <curl/curl.h>
 #include <neaacdec.h>
 #include <ao/ao.h>
+#include <pthread.h>
 
 struct aacPlayer {
 	/* buffer; should be large enough */
@@ -52,7 +53,7 @@ struct aacPlayer {
 	ao_device *audioOutDevice;
 	char *url;
 	char doQuit;
-	char doPause;
+	pthread_mutex_t pauseMutex;
 	CURL *audioFd;
 };
 
diff --git a/src/ui_act.c b/src/ui_act.c
index ae42164..5c28672 100644
--- a/src/ui_act.c
+++ b/src/ui_act.c
@@ -25,6 +25,7 @@ THE SOFTWARE.
 
 #include <string.h>
 #include <unistd.h>
+#include <pthread.h>
 /* needed by readline */
 #include <stdio.h>
 #include <readline/readline.h>
@@ -40,6 +41,14 @@ THE SOFTWARE.
 		BarUiMsg ("No song playing.\n"); \
 		return; }
 
+/*	helper to _really_ skip a song (unlock mutex, quit player)
+ *	@param player handle
+ */
+inline void BarUiDoSkipSong (struct aacPlayer *player) {
+	player->doQuit = 1;
+	pthread_mutex_unlock (&player->pauseMutex);
+}
+
 /*	transform station if necessary to allow changes like rename, rate, ...
  *	@param piano handle
  *	@param transform this station
@@ -101,7 +110,7 @@ void BarUiActBanSong (BAR_KS_ARGS) {
 	BarUiMsg ("Banning song... ");
 	if (BarUiPrintPianoStatus (PianoRateTrack (ph, *curSong,
 			PIANO_RATE_BAN)) == PIANO_RET_OK) {
-		player->doQuit = 1;
+		BarUiDoSkipSong (player);
 	}
 }
 
@@ -130,7 +139,7 @@ void BarUiActDeleteStation (BAR_KS_ARGS) {
 		BarUiMsg ("Deleting station... ");
 		if (BarUiPrintPianoStatus (PianoDeleteStation (ph,
 				*curStation)) == PIANO_RET_OK) {
-			player->doQuit = 1;
+			BarUiDoSkipSong (player);
 			PianoDestroyPlaylist (ph);
 			*curSong = NULL;
 			*curStation = NULL;
@@ -202,7 +211,7 @@ void BarUiActLoveSong (BAR_KS_ARGS) {
 /*	skip song
  */
 void BarUiActSkipSong (BAR_KS_ARGS) {
-	player->doQuit = 1;
+	BarUiDoSkipSong (player);
 }
 
 /*	move song to different station
@@ -227,7 +236,7 @@ void BarUiActMoveSong (BAR_KS_ARGS) {
 		}
 		if (BarUiPrintPianoStatus (PianoMoveSong (ph, fromStation,
 				moveStation, *curSong)) == PIANO_RET_OK) {
-			player->doQuit = 1;
+			BarUiDoSkipSong (player);
 		}
 	}
 }
@@ -235,7 +244,10 @@ void BarUiActMoveSong (BAR_KS_ARGS) {
 /*	pause
  */
 void BarUiActPause (BAR_KS_ARGS) {
-	player->doPause = !player->doPause;
+	/* already locked => unlock/unpause */
+	if (pthread_mutex_trylock (&player->pauseMutex) == EBUSY) {
+		pthread_mutex_unlock (&player->pauseMutex);
+	}
 }
 
 /*	rename current station
@@ -261,7 +273,7 @@ void BarUiActRenameStation (BAR_KS_ARGS) {
 /*	play another station
  */
 void BarUiActSelectStation (BAR_KS_ARGS) {
-	player->doQuit = 1;
+	BarUiDoSkipSong (player);
 	PianoDestroyPlaylist (ph);
 	*curSong = NULL;
 	*curStation = BarUiSelectStation (ph, "Select station: ");
@@ -281,7 +293,7 @@ void BarUiActTempBanSong (BAR_KS_ARGS) {
 	BarUiMsg ("Putting song on shelf... ");
 	if (BarUiPrintPianoStatus (PianoSongTired (ph, *curSong)) ==
 			PIANO_RET_OK) {
-		player->doQuit = 1;
+		BarUiDoSkipSong (player);
 	}
 }
 
@@ -328,5 +340,5 @@ void BarUiActSelectQuickMix (BAR_KS_ARGS) {
  */
 void BarUiActQuit (BAR_KS_ARGS) {
 	*doQuit = 1;
-	player->doQuit = 1;
+	BarUiDoSkipSong (player);
 }
-- 
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