audio: moved cmpAudioFormat() to audio_format.h

Rename it to audio_format_equals() and return "true" if they are
equal.

src/audio.c

@@ -66,14 +66,6 @@ static unsigned int audio_output_count(void)
 	return nr;
 }
 
-int cmpAudioFormat(const struct audio_format *f1, const struct audio_format *f2)
-{
-	if (f1 && f2 && (f1->sampleRate == f2->sampleRate) &&
-	    (f1->bits == f2->bits) && (f1->channels == f2->channels))
-		return 0;
-	return 1;
-}
-
 /* make sure initPlayerData is called before this function!! */
 void initAudioDriver(void)
 {
@@ -230,13 +222,8 @@ void finishAudioDriver(void)
 
 int isCurrentAudioFormat(const struct audio_format *audioFormat)
 {
-	if (!audioFormat)
-		return 1;
-
-	if (cmpAudioFormat(audioFormat, &audio_format) != 0)
-		return 0;
-
-	return 1;
+	return audioFormat == NULL ||
+		audio_format_equals(audioFormat, &audio_format);
 }
 
 static void syncAudioDeviceStates(void)

src/audio.h

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

src/audio_format.h

@@ -27,6 +27,14 @@ struct audio_format {
 	mpd_sint8 channels;
 };
 
+static inline int audio_format_equals(const struct audio_format *a,
+				      const struct audio_format *b)
+{
+	return a->sampleRate == b->sampleRate &&
+		a->bits == b->bits &&
+		a->channels == b->channels;
+}
+
 static inline double audio_format_time_to_size(const struct audio_format *af)
 {
 	return af->sampleRate * af->bits * af->channels / 8.0;

src/decoder_api.c

@@ -162,7 +162,7 @@ decoder_data(struct decoder *decoder, InputStream * inStream, int seekable,
 	static size_t convBufferLen;
 	int ret;
 
-	if (cmpAudioFormat(&(ob.audioFormat), &(dc.audioFormat)) == 0) {
+	if (audio_format_equals(&ob.audioFormat, &dc.audioFormat)) {
 		data = dataIn;
 		datalen = dataInLen;
 	} else {

src/output_control.c

@@ -20,7 +20,6 @@
 #include "output_api.h"
 #include "pcm_utils.h"
 #include "utils.h"
-#include "audio.h"
 
 int audio_output_open(struct audio_output *audioOutput,
 		      const struct audio_format *audioFormat)
@@ -28,7 +27,7 @@ int audio_output_open(struct audio_output *audioOutput,
 	int ret = 0;
 
 	if (audioOutput->open &&
-	    0 == cmpAudioFormat(audioFormat, &audioOutput->inAudioFormat)) {
+	    audio_format_equals(audioFormat, &audioOutput->inAudioFormat)) {
 		return 0;
 	}
 
@@ -46,8 +45,8 @@ int audio_output_open(struct audio_output *audioOutput,
 		ret = audioOutput->plugin->open(audioOutput);
 
 	audioOutput->sameInAndOutFormats =
-		!cmpAudioFormat(&audioOutput->inAudioFormat,
-		                &audioOutput->outAudioFormat);
+		audio_format_equals(&audioOutput->inAudioFormat,
+		                    &audioOutput->outAudioFormat);
 
 	return ret;
 }