Add PulseAudio support

git-svn-id: https://svn.musicpd.org/mpd/trunk@4316 09075e82-0dd4-0310-85a5-a0d7c8717e4f

1 files changed, 193 insertions, 0 deletions

diff --git a/src/audioOutputs/audioOutput_pulse.c b/src/audioOutputs/audioOutput_pulse.c
new file mode 100644
index 000000000..8dcf09f87
--- /dev/null
+++ b/src/audioOutputs/audioOutput_pulse.c
@@ -0,0 +1,193 @@
+#include "../audioOutput.h"
+
+#include <stdlib.h>
+
+#ifdef HAVE_PULSE
+
+#define MPD_PULSE_NAME "mpd"
+#define MPD_PULSE_STREAM_NAME "mpd"
+
+#include "../conf.h"
+#include "../log.h"
+
+#include <pulse/simple.h>
+#include <pulse/error.h>
+
+typedef struct _PulseData {
+	char * server;
+	char * sink;
+	pa_simple * s;
+} PulseData;
+
+static PulseData * newPulseData()
+{
+	PulseData * ret;
+	
+	ret = malloc(sizeof(PulseData));
+	ret->server = NULL;
+	ret->sink = NULL;
+	ret->s = NULL;
+	return ret;
+}
+
+static void freePulseData(PulseData * ad)
+{
+	if (ad->server) free(ad->server);
+	if (ad->sink) free(ad->sink);
+	free(ad);
+}
+
+static int pulse_initDriver(AudioOutput * audioOutput, ConfigParam * param)
+{
+	BlockParam * server = NULL;
+	BlockParam * sink = NULL;
+	PulseData * ad;
+
+	if (param) {
+		server = getBlockParam(param, "server");
+		sink = getBlockParam(param, "sink");
+	}
+
+	ad = newPulseData();
+	ad->server = server ? strdup(server->value) : NULL;
+	ad->sink = sink ? strdup(sink->value) : NULL;
+	audioOutput->data = ad;
+
+	return 0;
+}
+
+static void pulse_finishDriver(AudioOutput * audioOutput)
+{
+	freePulseData((PulseData *) audioOutput->data);
+}
+
+static int pulse_testDefault()
+{
+	pa_simple * s;
+	pa_sample_spec ss;
+	int error;
+
+	ss.format = PA_SAMPLE_S16NE;
+	ss.rate = 44100;
+	ss.channels = 2;
+
+	s = pa_simple_new(NULL, MPD_PULSE_NAME, PA_STREAM_PLAYBACK, NULL,
+	                  MPD_PULSE_STREAM_NAME, &ss, NULL, NULL, &error);
+	if (!s) {
+		WARNING("Cannot connect to default PulseAudio server: %s\n",
+		        pa_strerror(error));
+		return -1;
+	}
+
+	pa_simple_free(s);
+
+	return 0;
+}
+
+static int pulse_openDevice(AudioOutput * audioOutput)
+{
+	PulseData * ad;
+	AudioFormat * audioFormat;
+	pa_sample_spec ss;
+	int error;
+
+	ad = audioOutput->data;
+	audioFormat = &audioOutput->outAudioFormat;
+
+	if (audioFormat->bits != 16) {
+		ERROR("PulseAudio doesn't support %i bit audio\n",
+		      audioFormat->bits);
+		return -1;
+	}
+
+	ss.format = PA_SAMPLE_S16NE;
+	ss.rate = audioFormat->sampleRate;
+	ss.channels = audioFormat->channels;
+
+	ad->s = pa_simple_new(ad->server, MPD_PULSE_NAME, PA_STREAM_PLAYBACK,
+	                       ad->sink, MPD_PULSE_STREAM_NAME, &ss,
+	                       NULL, NULL, &error);
+	if (!ad->s) {
+		ERROR("Cannot connect to server in PulseAudio output " \
+		      "\"%s\": %s\n", audioOutput->name, pa_strerror(error));
+		return -1;
+	}
+
+	audioOutput->open = 1;
+
+	DEBUG("PulseAudio output \"%s\" connected and playing %i bit, %i " \
+	      "channel audio at %i Hz\n", audioOutput->name, audioFormat->bits,
+	      audioFormat->channels, audioFormat->sampleRate);
+
+	return 0;
+}
+
+static void pulse_dropBufferedAudio(AudioOutput * audioOutput)
+{
+	PulseData * ad;
+	int error;
+
+	ad = audioOutput->data;
+	if (pa_simple_flush(ad->s, &error) < 0) 
+		WARNING("Flush failed in PulseAudio output \"%s\": %s\n",
+		        audioOutput->name, pa_strerror(error));
+}
+
+static void pulse_closeDevice(AudioOutput * audioOutput)
+{
+	PulseData * ad;
+
+	ad = audioOutput->data;
+	if (ad->s) {
+		pa_simple_drain(ad->s, NULL);
+		pa_simple_free(ad->s);
+	}
+
+	audioOutput->open = 0;
+}
+
+static int pulse_playAudio(AudioOutput * audioOutput, char * playChunk,
+                           int size)
+{
+	PulseData * ad;
+	int error;
+
+	ad = audioOutput->data;
+
+	if (pa_simple_write(ad->s, playChunk, size, &error) < 0) {
+		ERROR("PulseAudio output \"%s\" disconnecting due to write " \
+		      "error: %s\n", audioOutput->name, pa_strerror(error));
+		pulse_closeDevice(audioOutput);
+		return -1;
+	}
+
+	return 0;
+}
+
+AudioOutputPlugin pulsePlugin = {
+	"pulse",
+	pulse_testDefault,
+	pulse_initDriver,
+	pulse_finishDriver,
+	pulse_openDevice,
+	pulse_playAudio,
+	pulse_dropBufferedAudio,
+	pulse_closeDevice,
+	NULL, /* sendMetadataFunc */
+};
+
+#else /* HAVE_PULSE */
+
+AudioOutputPlugin pulsePlugin =
+{
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+};
+
+#endif /* HAVE_PULSE */