if no audioOutput specified, we no attempt to detect if there exists a usable oss or alsa device

git-svn-id: https://svn.musicpd.org/mpd/trunk@3057 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/audioOutputs/audioOutput_alsa.c

@@ -69,7 +69,10 @@ static void freeAlsaData(AlsaData * ad) {
 }
 
 static int alsa_initDriver(AudioOutput * audioOutput, ConfigParam * param) {
-	BlockParam * bp = getBlockParam(param, "device");
+	BlockParam * bp = NULL;
+
+	if(param) bp = getBlockParam(param, "device");
+
 	AlsaData * ad = newAlsaData();
 	
 	audioOutput->data = ad;
@@ -85,6 +88,23 @@ static void alsa_finishDriver(AudioOutput * audioOutput) {
 	freeAlsaData(ad);
 }
 
+static int alsa_testDefault()
+{
+	snd_pcm_t * handle;
+
+	int ret = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 
+					           SND_PCM_NONBLOCK);
+	
+	if(ret) {
+		WARNING("Error opening default alsa device: %s\n",
+				snd_strerror(-ret));
+		return -1;
+	}
+	else snd_pcm_close(handle);
+
+	return 0;
+}
+
 static int alsa_openDevice(AudioOutput * audioOutput) 
 {
 	AlsaData * ad = audioOutput->data;
@@ -313,6 +333,7 @@ static int alsa_playAudio(AudioOutput * audioOutput, char * playChunk,
 AudioOutputPlugin alsaPlugin =
 {
 	"alsa",
+	alsa_testDefault,
 	alsa_initDriver,
 	alsa_finishDriver,
 	alsa_openDevice,
@@ -332,6 +353,7 @@ AudioOutputPlugin alsaPlugin =
 	NULL,
 	NULL,
 	NULL,
+	NULL,
 	NULL /* sendMetadataFunc */
 };
 

src/audioOutputs/audioOutput_ao.c

@@ -237,6 +237,7 @@ static int audioOutputAo_play(AudioOutput * audioOutput, char * playChunk,
 AudioOutputPlugin aoPlugin = 
 {
 	"ao",
+	NULL,
 	audioOutputAo_initDriver,
 	audioOutputAo_finishDriver,
 	audioOutputAo_openDevice,
@@ -259,6 +260,7 @@ AudioOutputPlugin aoPlugin =
 	NULL,
 	NULL,
 	NULL,
+	NULL,
 	NULL
 };
 

src/audioOutputs/audioOutput_oss.c

@@ -291,10 +291,38 @@ static int oss_statDevice(char * device, int * stErrno) {
 	return 0;
 }
 
+static int oss_testDefault() {
+	int fd;
+
+	fd = open("/dev/sound/dsp", O_WRONLY);
+
+	if(fd) {
+		close(fd);
+		return 0;
+	}
+
+	WARNING("Error opening OSS device \"/dev/sound/dsp\": %s\n",
+			strerror(errno));
+
+	fd = open("/dev/dsp", O_WRONLY);
+
+	if(fd) {
+		close(fd);
+		return 0;
+	}
+
+	WARNING("Error opening OSS device \"/dev/dsp\": %s\n",
+			strerror(errno));
+
+	return -1;
+}
+
 static int oss_initDriver(AudioOutput * audioOutput, ConfigParam * param) {
-	BlockParam * bp = getBlockParam(param, "device");
+	BlockParam * bp = NULL;
+
+	if(param) bp = getBlockParam(param, "device");
+
 	OssData * od = newOssData();
-	
 	audioOutput->data = od;
 
 	if(!bp) {
@@ -307,8 +335,14 @@ static int oss_initDriver(AudioOutput * audioOutput, ConfigParam * param) {
 		if(ret[0] == 0) od->device = strdup("/dev/sound/dsp");
 		else if(ret[1] == 0) od->device = strdup("/dev/dsp");
 		else {
-			ERROR("Error trying to open default OSS device "
-				"specified at line %i\n", param->line);
+			if(param) {
+				ERROR("Error trying to open default OSS device "
+					"specified at line %i\n", param->line);
+			}
+			else {
+				ERROR("Error trying to open default OSS "
+						"device\n");
+			}
 
 			if(ret[0] == ret[1] == OSS_STAT_DOESN_T_EXIST) {
 				ERROR("Neither /dev/dsp nor /dev/sound/dsp "
@@ -501,6 +535,7 @@ static int oss_playAudio(AudioOutput * audioOutput, char * playChunk,
 AudioOutputPlugin ossPlugin =
 {
 	"oss",
+	oss_testDefault,
 	oss_initDriver,
 	oss_finishDriver,
 	oss_openDevice,
@@ -521,6 +556,7 @@ AudioOutputPlugin ossPlugin =
 	NULL,
 	NULL,
 	NULL,
+	NULL,
 	NULL /* sendMetadataFunc */
 };
 

src/audioOutputs/audioOutput_shout.c

@@ -597,6 +597,7 @@ static void myShout_setTag(AudioOutput * audioOutput, MpdTag * tag) {
 AudioOutputPlugin shoutPlugin = 
 {
 	"shout",
+	NULL,
 	myShout_initDriver,
 	myShout_finishDriver,
 	myShout_openDevice,
@@ -617,6 +618,7 @@ AudioOutputPlugin shoutPlugin =
 	NULL,
 	NULL,
 	NULL,
+	NULL,
 	NULL
 };