From c324c1f0bc2974d154a2dd2ff1472d652f3f45c2 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Mon, 1 Jun 2009 20:25:38 +0100
Subject: Fall back to 'aplay' if the mixer callback doesn't get called, or if
 SDL audio can't initialise

---
 src/audio.c | 52 +++++++++++++++++++++++++++++++++++++---------------
 src/types.h |  1 +
 2 files changed, 38 insertions(+), 15 deletions(-)

diff --git a/src/audio.c b/src/audio.c
index 3cb498b..1ec8108 100644
--- a/src/audio.c
+++ b/src/audio.c
@@ -64,12 +64,19 @@ static void audio_mix(void *data, Uint8 *stream8, int len)
 		}
 
 	}
+
+	a->aplay_fallback = 0;
 }
 
 void audio_trigger_moo()
 {
 	AudioContext *a = audio_context;
 
+	if ( a->mootex != 0 ) {
+		printf("Mootex says 'no'\n");
+		return;
+	}
+
 	if ( a == NULL ) {
 		/* Try to open the audio again */
 		printf("Trying to open the audio again...\n");
@@ -77,15 +84,30 @@ void audio_trigger_moo()
 		a = audio_context;
 		if ( a == NULL ) return;
 	}
-	if ( a->mootex != 0 ) {
-		printf("Mootex says 'no'\n");
-		return;
-	}
-
 	printf("Moo!\n");
 	a->mootex = 1;
 
-	if ( a->moo_pos == a->moo_len ) {
+	if ( a->aplay_fallback ) {
+
+		pid_t pid;
+		int status;
+
+		printf("Using aplay fallback\n");
+		pid = fork();
+		if ( !( (pid != 0) && (pid != -1) ) ) {
+			if ( pid == -1 ) {
+				fprintf(stderr, "fork() failed.\n");
+				return;
+			} else {
+				/* Forked successfully, child process */
+				execlp("aplay", "aplay",
+				       DATADIR"/openmoocow/moo.wav", NULL);
+			}
+		} /* else forked successfully, parent process */
+		waitpid(pid, &status, 0);
+		a->mootex = 0;
+
+	} else if ( a->moo_pos == a->moo_len ) {
 		a->moo_pos = 0;
 	}
 }
@@ -103,7 +125,8 @@ void audio_setup()
 	/* Create audio context */
 	a = malloc(sizeof(AudioContext));
 	assert(a != NULL);
-	a->mootex = 0;
+	a->mootex = 1;		/* Not ready yet */
+	audio_context = a;
 
 	/* 16-bit mono audio at 44.1 kHz */
 	fmt.freq = 44100;
@@ -116,24 +139,21 @@ void audio_setup()
 
 	if ( SDL_OpenAudio(&fmt, NULL) < 0 ) {
 		fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
-		free(a);
-		return;
+		goto out; /* and use fallback */
 	}
 
 	if ( SDL_LoadWAV(DATADIR"/openmoocow/moo.wav", &wave, &data, &dlen)
 								== NULL ) {
 		fprintf(stderr, "Couldn't load moo sound: %s\n",
 				SDL_GetError());
-		free(a);
-		return;
+		goto out; /* and use fallback */
 	}
 	SDL_BuildAudioCVT(&cvt, wave.format, wave.channels, wave.freq,
 				AUDIO_S16, 1, 44100);
 	cvt.buf = malloc(dlen*cvt.len_mult);
 	if ( cvt.buf == NULL ) {
 		fprintf(stderr, "Not enough memory to convert audio \n");
-		free(a);
-		return;
+		goto out; /* and use fallback */
 	}
 	memcpy(cvt.buf, data, dlen);
 	cvt.len = dlen;
@@ -143,10 +163,12 @@ void audio_setup()
 	a->moo_len = cvt.len_cvt/2 - 2;	/* Convert bytes to samples */
 	a->moo_pos = a->moo_len;	/* Play nothing to start with */
 	a->moo_buf = (Sint16 *)cvt.buf;
-
-	audio_context = a;
+	a->aplay_fallback = 1;
 
 	SDL_PauseAudio(0);
+
+out:
+	a->mootex = 0;		/* Ready now */
 }
 
 void audio_shutdown()
diff --git a/src/types.h b/src/types.h
index b1752f7..b59c933 100644
--- a/src/types.h
+++ b/src/types.h
@@ -63,6 +63,7 @@ typedef struct {
 	long		moo_len;
 	long		moo_pos;
 	Sint16		*moo_buf;
+	int		aplay_fallback;
 
 	unsigned int	mootex;
 
-- 
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