mixer: return a mixer struct pointer

Don't use statically allocated mixer objects.

src/mixer_api.c

@@ -37,6 +37,22 @@ void mixer_finish(struct mixer *mixer)
 	mixer->plugin = NULL;
 }
 
+struct mixer *
+mixer_new(const struct mixer_plugin *plugin)
+{
+	struct mixer *mixer = g_new(struct mixer, 1);
+
+	mixer_init(mixer, plugin);
+	return mixer;
+}
+
+void
+mixer_free(struct mixer *mixer)
+{
+	mixer_finish(mixer);
+	g_free(mixer);
+}
+
 void mixer_configure(struct mixer *mixer, const struct config_param *param)
 {
 	assert(mixer != NULL && mixer->plugin != NULL);

src/mixer_api.h

@@ -71,6 +71,13 @@ struct mixer {
 
 void mixer_init(struct mixer *mixer, const struct mixer_plugin *plugin);
 void mixer_finish(struct mixer *mixer);
+
+struct mixer *
+mixer_new(const struct mixer_plugin *plugin);
+
+void
+mixer_free(struct mixer *mixer);
+
 void mixer_configure(struct mixer *mixer, const struct config_param *param);
 bool mixer_open(struct mixer *mixer);
 bool mixer_control(struct mixer *mixer, int cmd, void *arg);

src/output/alsa_plugin.c

@@ -71,7 +71,7 @@ struct alsa_data {
 	size_t frame_size;
 
 	/** the mixer object associated with this output */
-	struct mixer mixer;
+	struct mixer *mixer;
 };
 
 static const char *
@@ -90,7 +90,7 @@ alsa_data_new(void)
 	ret->writei = snd_pcm_writei;
 
 	//use alsa mixer by default
-	mixer_init(&ret->mixer, &alsa_mixer);
+	ret->mixer = mixer_new(&alsa_mixer);
 
 	return ret;
 }
@@ -99,7 +99,7 @@ static void
 alsa_data_free(struct alsa_data *ad)
 {
 	g_free(ad->device);
-	mixer_finish(&ad->mixer);
+	mixer_free(ad->mixer);
 	free(ad);
 }
 
@@ -148,7 +148,7 @@ alsa_init(G_GNUC_UNUSED struct audio_output *ao,
 	alsa_configure(ad, param);
 
 	if (param) {
-		mixer_configure(&ad->mixer, param);
+		mixer_configure(ad->mixer, param);
 	}
 
 	return ad;
@@ -208,7 +208,7 @@ alsa_open(void *data, struct audio_format *audio_format)
 	unsigned int period_time, period_time_ro;
 	unsigned int buffer_time;
 
-	mixer_open(&ad->mixer);
+	mixer_open(ad->mixer);
 
 	if ((bitformat = get_bitformat(audio_format)) == SND_PCM_FORMAT_UNKNOWN)
 		g_warning("ALSA device \"%s\" doesn't support %u bit audio\n",
@@ -436,7 +436,7 @@ alsa_close(void *data)
 		ad->pcm = NULL;
 	}
 
-	mixer_close(&ad->mixer);
+	mixer_close(ad->mixer);
 }
 
 static bool
@@ -475,7 +475,7 @@ static bool
 alsa_control(void *data, int cmd, void *arg)
 {
 	struct alsa_data *ad = data;
-	return mixer_control(&ad->mixer, cmd, arg);
+	return mixer_control(ad->mixer, cmd, arg);
 }
 
 const struct audio_output_plugin alsaPlugin = {

src/output/oss_plugin.c

@@ -55,7 +55,9 @@ typedef struct _OssData {
 	int numSupported[3];
 	int *unsupported[3];
 	int numUnsupported[3];
-	struct mixer mixer;
+
+	/** the mixer object associated with this output */
+	struct mixer *mixer;
 } OssData;
 
 enum oss_support {
@@ -276,7 +278,7 @@ static OssData *newOssData(void)
 	supportParam(ret, SNDCTL_DSP_CHANNELS, 2);
 	supportParam(ret, SNDCTL_DSP_SAMPLESIZE, 16);
 
-	mixer_init( &ret->mixer, &oss_mixer);
+	ret->mixer = mixer_new(&oss_mixer);
 
 	return ret;
 }
@@ -290,7 +292,7 @@ static void freeOssData(OssData * od)
 	g_free(od->unsupported[OSS_CHANNELS]);
 	g_free(od->unsupported[OSS_BITS]);
 
-	mixer_finish(&od->mixer);
+	mixer_free(od->mixer);
 
 	free(od);
 }
@@ -355,7 +357,7 @@ static void *oss_open_default(const struct config_param *param)
 		if (ret[i] == 0) {
 			OssData *od = newOssData();
 			od->device = default_devices[i];
-			mixer_configure(&od->mixer, param);
+			mixer_configure(od->mixer, param);
 			return od;
 		}
 	}
@@ -396,7 +398,7 @@ oss_initDriver(G_GNUC_UNUSED struct audio_output *audioOutput,
 	if (device != NULL) {
 		OssData *od = newOssData();
 		od->device = device;
-		mixer_configure(&od->mixer, param);
+		mixer_configure(od->mixer, param);
 		return od;
 	}
 
@@ -522,7 +524,7 @@ oss_openDevice(void *data, struct audio_format *audioFormat)
 		od->audio_format.bits, od->audio_format.channels,
 		od->audio_format.sample_rate);
 
-	mixer_open(&od->mixer);
+	mixer_open(od->mixer);
 
 	return ret;
 }
@@ -532,7 +534,7 @@ static void oss_closeDevice(void *data)
 	OssData *od = data;
 
 	oss_close(od);
-	mixer_close(&od->mixer);
+	mixer_close(od->mixer);
 }
 
 static void oss_dropBufferedAudio(void *data)
@@ -575,7 +577,7 @@ static bool
 oss_control(void *data, int cmd, void *arg)
 {
 	OssData *od = data;
-	return mixer_control(&od->mixer, cmd, arg);
+	return mixer_control(od->mixer, cmd, arg);
 }
 
 const struct audio_output_plugin ossPlugin = {