pulse mixer

This patch introduces the mixer for the pulse output.

Technically speaking, the pulse index is needed to get or set
the volume. You must define callback fonctions to get this index since
the pulse output in mpd is done using the simpe api. The pulse simple api
does not provide the index of the newly defined output.

So callback fonctions are associated to the pulse context.
The list of all the sink input is then retreived.
Then we select the name of the mpd pulse output and control
its volume by its associated index number.

Signed-off-by: Patrice Linel <patnathanael@gmail.com>
Signed-off-by: David Guibert <david.guibert@gmail.com>

[mk: fixed whitespace errors and broke long lines; removed
daemonization changes from main.c]

2 files changed, 278 insertions, 0 deletions

diff --git a/src/mixer/pulse_mixer.c b/src/mixer/pulse_mixer.c
new file mode 100644
index 000000000..2568943af
--- /dev/null
+++ b/src/mixer/pulse_mixer.c
@@ -0,0 +1,277 @@
+#include "../output_api.h"
+#include "../mixer_api.h"
+
+#include <glib.h>
+#include <pulse/volume.h>
+#include <pulse/pulseaudio.h>
+
+struct pulse_mixer {
+	struct mixer base;
+	char *server;
+	char *sink;
+	char *output_name;
+	uint32_t index;
+	bool	online;
+	struct pa_context *context;
+	struct pa_threaded_mainloop *mainloop;
+	struct pa_cvolume *volume;
+
+};
+
+static void
+sink_input_cb(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
+	      int eol, void *userdata)
+{
+
+	struct pulse_mixer *pm = userdata;
+	if (eol) {
+		g_debug("eol error sink_input_cb");
+		return;
+	}
+
+	if (!i) {
+		g_debug("Sink input callback failure");
+		return;
+	}
+	g_debug("sink input cb %s, index %d ",i->name,i->index);
+	if(strcmp(i->name,pm->output_name)==0) {
+		pm->index=i->index;
+		pm->online=true;
+		*pm->volume=i->volume;
+	} else
+		g_debug("bad name");
+}
+
+static void
+sink_input_vol(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
+	       int eol, void *userdata)
+{
+
+	struct pulse_mixer *pm = userdata;
+	if (eol) {
+		g_debug("eol error sink_input_vol");
+		return;
+	}
+
+	if (!i) {
+		g_debug("Sink input callback failure");
+		return;
+	}
+	g_debug("sink input vol %s, index %d ", i->name, i->index);
+	*pm->volume=i->volume;
+}
+
+static void
+subscribe_cb(G_GNUC_UNUSED pa_context *c, pa_subscription_event_type_t t,
+	     uint32_t idx, void *userdata)
+{
+
+	struct pulse_mixer *pm = userdata;
+	g_debug("pulse_mixer: subscribe call back");
+	switch (t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) {
+	case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
+		if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) ==
+		    PA_SUBSCRIPTION_EVENT_REMOVE)
+			pm->online =false;
+		else {
+			pa_operation *o;
+
+			if (!(o = pa_context_get_sink_input_info(pm->context, idx, sink_input_cb, pm))) {
+				g_debug("pulse_mixer: pa_context_get_sink_input_info() failed");
+				return;
+			}
+
+			pa_operation_unref(o);
+		}
+		break;
+	}
+}
+
+static void
+context_state_cb(pa_context *context, void *userdata)
+{
+	struct pulse_mixer *pm = userdata;
+	switch (pa_context_get_state(context)) {
+	case PA_CONTEXT_READY: {
+		pa_operation *o;
+
+		pa_context_set_subscribe_callback(context, subscribe_cb, pm);
+
+		if (!(o = pa_context_subscribe(context, (pa_subscription_mask_t)
+					       (PA_SUBSCRIPTION_MASK_SINK_INPUT), NULL, NULL))) {
+			g_debug("pulse_mixer: pa_context_subscribe() failed");
+			return;
+		}
+		pa_operation_unref(o);
+
+
+		if (!(o = pa_context_get_sink_input_info_list(context, sink_input_cb, pm))) {
+			g_debug("pulse_mixer: pa_context_get_sink_input_info_list() failed");
+			return;
+		}
+		pa_operation_unref(o);
+
+
+		pa_threaded_mainloop_signal(pm->mainloop, 0);
+		break;
+	}
+
+	case PA_CONTEXT_UNCONNECTED:
+	case PA_CONTEXT_CONNECTING:
+	case PA_CONTEXT_AUTHORIZING:
+	case PA_CONTEXT_SETTING_NAME:
+		break;
+	case PA_CONTEXT_TERMINATED:
+	case PA_CONTEXT_FAILED:
+		pa_threaded_mainloop_signal(pm->mainloop, 0);
+		break;
+	}
+}
+
+
+static struct mixer *
+pulse_mixer_init(const struct config_param *param)
+{
+	struct pulse_mixer *pm = g_new(struct pulse_mixer,1);
+	mixer_init(&pm->base, &pulse_mixer);
+	pm->server = NULL;
+	pm->sink = NULL;
+	pm->context=NULL;
+	pm->mainloop=NULL;
+	pm->volume=NULL;
+	pm->output_name=NULL;
+	pm->index=0;
+	pm->online=false;
+
+	pm->volume = g_new(struct pa_cvolume,1);
+
+	pm->server = param != NULL
+		? config_dup_block_string(param, "server", NULL) : NULL;
+	pm->sink = param != NULL
+		? config_dup_block_string(param, "sink", NULL) : NULL;
+	pm->output_name = param != NULL
+		? config_dup_block_string(param, "name", NULL) : NULL;
+
+
+	g_debug("pulse_mixer: init");
+
+	if(!(pm->mainloop = pa_threaded_mainloop_new())) {
+		g_debug("pulse_mixer: failed mainloop");
+		g_free(pm);
+		return NULL;
+	}
+
+	if(!(pm->context = pa_context_new(pa_threaded_mainloop_get_api(pm->mainloop),
+					  "Mixer mpd"))) {
+		g_debug("pulse_mixer: failed context");
+		g_free(pm);
+		return NULL;
+	}
+
+	pa_context_set_state_callback(pm->context, context_state_cb, pm);
+
+	if (pa_context_connect(pm->context, pm->server,
+			       (pa_context_flags_t)0, NULL) < 0) {
+		g_debug("pulse_mixer: context server fail");
+		g_free(pm);
+		return NULL;
+	}
+
+	pa_threaded_mainloop_lock(pm->mainloop);
+	if (pa_threaded_mainloop_start(pm->mainloop) < 0) {
+		g_debug("pulse_mixer: error start mainloop");
+		g_free(pm);
+		return NULL;
+	}
+
+	pa_threaded_mainloop_wait(pm->mainloop);
+
+	if (pa_context_get_state(pm->context) != PA_CONTEXT_READY) {
+		g_debug("pulse_mixer: error context not ready");
+		g_free(pm);
+		return NULL;
+	}
+
+	pa_threaded_mainloop_unlock(pm->mainloop);
+	return &pm->base ;
+
+}
+
+static void
+pulse_mixer_finish(struct mixer *data)
+{
+	struct pulse_mixer *pm = (struct pulse_mixer *) data;
+	pm->context  = NULL;
+	pm->mainloop = NULL;
+	pm->volume   = NULL;
+	pm->online   = false;
+	g_free(pm);
+}
+
+static bool
+pulse_mixer_open(G_GNUC_UNUSED struct mixer *data)
+{
+	g_debug("pulse mixer open");
+	return true;
+}
+
+static void
+pulse_mixer_close(G_GNUC_UNUSED struct mixer *data)
+{
+	return;
+}
+
+static int
+pulse_mixer_get_volume(struct mixer *mixer)
+{
+	struct pulse_mixer *pm=(struct pulse_mixer *) mixer;
+	int ret;
+	pa_operation *o;
+
+	g_debug("pulse_mixer: get_volume %s",
+		pm->online == TRUE ? "online" : "offline");
+	if(pm->online) {
+		if (!(o = pa_context_get_sink_input_info(pm->context, pm->index,
+							 sink_input_vol, pm))) {
+			g_debug("pa_context_get_sink_input_info() failed");
+			return false;
+		}
+		pa_operation_unref(o);
+
+		ret = (int)((100*(pa_cvolume_avg(pm->volume)+1))/PA_VOLUME_NORM);
+		g_debug("pulse_mixer: volume %d", ret);
+		return ret;
+	}
+
+	return false;
+}
+
+static bool
+pulse_mixer_set_volume(struct mixer *mixer, unsigned volume)
+{
+	struct pulse_mixer *pm=(struct pulse_mixer *) mixer;
+	pa_operation *o;
+	if (pm->online) {
+		pa_cvolume_set(pm->volume, (pm->volume)->channels,
+				(pa_volume_t)(volume)*PA_VOLUME_NORM/100+0.5);
+
+		if (!(o = pa_context_set_sink_input_volume(pm->context, pm->index,
+							   pm->volume, NULL, NULL))) {
+			g_debug("pulse_mixer: pa_context_set_sink_input_volume() failed");
+			return false;
+		}
+
+		pa_operation_unref(o);
+	}
+
+	return true;
+}
+
+const struct mixer_plugin pulse_mixer = {
+	.init = pulse_mixer_init,
+	.finish = pulse_mixer_finish,
+	.open = pulse_mixer_open,
+	.close = pulse_mixer_close,
+	.get_volume = pulse_mixer_get_volume,
+	.set_volume = pulse_mixer_set_volume,
+};
diff --git a/src/mixer_api.h b/src/mixer_api.h
index c8f219d83..e80a6511f 100644
--- a/src/mixer_api.h
+++ b/src/mixer_api.h
@@ -27,6 +27,7 @@
 
 extern const struct mixer_plugin alsa_mixer;
 extern const struct mixer_plugin oss_mixer;
+extern const struct mixer_plugin pulse_mixer;
 
 struct config_param;