audio: replaced copyAudioFormat() with simple assignment

The "!src" check in copyAudioFormat() used to hide bugs - one should
never pass NULL to it.  There is one caller which might pass NULL, add
a check in this caller.

Instead of doing mempcy(), we can simply assign the structures, which
looks more natural.

src/audio.c

@@ -66,14 +66,6 @@ static unsigned int audio_output_count(void)
 	return nr;
 }
 
-void copyAudioFormat(struct audio_format *dest, const struct audio_format *src)
-{
-	if (!src)
-		return;
-
-	memcpy(dest, src, sizeof(*dest));
-}
-
 int cmpAudioFormat(const struct audio_format *f1, const struct audio_format *f2)
 {
 	if (f1 && f2 && (f1->sampleRate == f2->sampleRate) &&
@@ -130,10 +122,9 @@ void initAudioDriver(void)
 void getOutputAudioFormat(const struct audio_format *inAudioFormat,
 			  struct audio_format *outAudioFormat)
 {
-	if (audio_configFormat) {
-		copyAudioFormat(outAudioFormat, audio_configFormat);
-	} else
-		copyAudioFormat(outAudioFormat, inAudioFormat);
+	*outAudioFormat = audio_configFormat != NULL
+		? *audio_configFormat
+		: *inAudioFormat;
 }
 
 void initAudioConfig(void)
@@ -316,7 +307,8 @@ int openAudioDevice(const struct audio_format *audioFormat)
 
 	if (!audioOpened || !isCurrentAudioFormat(audioFormat)) {
 		flushAudioBuffer();
-		copyAudioFormat(&audio_format, audioFormat);
+		if (audioFormat != NULL)
+			audio_format = *audioFormat;
 		audioBufferSize = (audio_format.bits >> 3) *
 		    audio_format.channels;
 		audioBufferSize *= audio_format.sampleRate >> 5;

src/audio.h

@@ -27,8 +27,6 @@ struct audio_format;
 struct tag;
 struct client;
 
-void copyAudioFormat(struct audio_format *dest, const struct audio_format *src);
-
 int cmpAudioFormat(const struct audio_format *dest, const struct audio_format *src);
 
 void getOutputAudioFormat(const struct audio_format *inFormat,

src/output_control.c

@@ -32,14 +32,12 @@ int audio_output_open(struct audio_output *audioOutput,
 		return 0;
 	}
 
-	copyAudioFormat(&audioOutput->inAudioFormat, audioFormat);
+	audioOutput->inAudioFormat = *audioFormat;
 
 	if (audioOutput->convertAudioFormat) {
-		copyAudioFormat(&audioOutput->outAudioFormat,
-		                &audioOutput->reqAudioFormat);
+		audioOutput->outAudioFormat = audioOutput->reqAudioFormat;
 	} else {
-		copyAudioFormat(&audioOutput->outAudioFormat,
-		                &audioOutput->inAudioFormat);
+		audioOutput->outAudioFormat = audioOutput->inAudioFormat;
 		if (audioOutput->open)
 			audio_output_close(audioOutput);
 	}

src/output_init.c

@@ -103,7 +103,7 @@ int audio_output_init(struct audio_output *ao, ConfigParam * param)
 			FATAL("error parsing format at line %i\n", bp->line);
 		}
 
-		copyAudioFormat(&ao->outAudioFormat, &ao->reqAudioFormat);
+		ao->outAudioFormat = ao->reqAudioFormat;
 	}
 
 	if (plugin->init(ao, param) != 0)