Patch(s) provied by Fabien Devaux

This fixes bug# 4421

http://projects.blender.org/tracker/index.php?func=detail&aid=4421&group_id=9&atid=125

Initalizes audio in scrub mode properly.
also avoids playing back some samples twice.

Kent

source/blender/src/seqaudio.c

@@ -90,6 +90,7 @@ void audio_fill(void *mixdown, Uint8 *sstream, int len);
 static int audio_pos;
 static int audio_scrub=0;
 static int audio_playing=0;
+static int audio_initialised=0;
 /////
 //
 /* local protos ------------------- */
@@ -445,11 +446,12 @@ static int audio_init(SDL_AudioSpec *desired)
 		if (obtained) MEM_freeN(obtained);
 		return 0;
 	}
+	audio_initialised = 1;
 	hardware_spec=obtained;
 	
 	MEM_freeN(obtained);
 
-	SDL_PauseAudio(1);
+	SDL_PauseAudio(0);
 	return 1;
 }
 
@@ -510,7 +512,7 @@ void audiostream_play(Uint32 startframe, Uint32 duration, int mixdown)
 		sound_init_audio();
 	}
 
-   	if (!(duration + mixdown)) {
+   	if (!audio_initialised || !(duration + mixdown)) {
    		desired.freq=G.scene->audio.mixrate;
 		desired.format=AUDIO_S16SYS;
    		desired.channels=2;
@@ -520,6 +522,7 @@ void audiostream_play(Uint32 startframe, Uint32 duration, int mixdown)
    			U.mixbufsize = 0;	/* no audio */
    		}
    	}
+
 	audio_pos = ( ((int)( (((float)startframe)
 			       /(float)G.scene->r.frs_sec)
 			      *(G.scene->audio.mixrate)*4 )) & (~3) );

source/blender/src/space.c

@@ -3600,7 +3600,7 @@ static void winqreadseqspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 	View2D *v2d= &sseq->v2d;
 	Sequence *last_seq = get_last_seq();
 	float dx, dy;
-	int doredraw= 0, cfra, first;
+	int doredraw= 0, cfra=0, first;
 	short mval[2];
 	short nr;
 	short mousebut = L_MOUSE;
@@ -3652,7 +3652,8 @@ static void winqreadseqspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 				
 				set_special_seq_update(0);
 				
-				update_for_newframe();
+				if (cfra == 0)
+					update_for_newframe();
 			}
 			break;
 		case MIDDLEMOUSE: