uaudio: pulseaudio support

[disorder] / lib / uaudio-pulseaudio.c

diff --git a/lib/uaudio-pulseaudio.c b/lib/uaudio-pulseaudio.c
new file mode 100644 (file)
index 0000000..f0124be
--- /dev/null
+++ b/lib/uaudio-pulseaudio.c
@@ -0,0 +1,151 @@
+/*
+ * This file is part of DisOrder.
+ * Copyright (C) 2013 Richard Kettlewell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/** @file lib/uaudio-pulseaudio.c
+ * @brief Support for PulseAudio backend */
+#include "common.h"
+
+#if HAVE_PULSEAUDIO
+
+#include <pulse/simple.h>
+#include <pulse/error.h>
+
+#include "mem.h"
+#include "log.h"
+#include "uaudio.h"
+#include "configuration.h"
+
+static const char *const pulseaudio_options[] = {
+  "application",
+  NULL
+};
+
+static pa_simple *pulseaudio_simple_handle;
+
+/** @brief Open the PulseAudio sound device */
+static void pulseaudio_open() {
+  pa_sample_spec ss;
+  int error;
+  ss.format = -1;
+  switch(uaudio_bits) {
+  case 8:
+    if(!uaudio_signed)
+      ss.format = PA_SAMPLE_U8;
+    break;
+  case 16:
+    if(uaudio_signed)
+      ss.format = PA_SAMPLE_S16NE;
+    break;
+  case 32:
+    if(uaudio_signed)
+      ss.format = PA_SAMPLE_S32NE;
+    break;
+  }
+  if(ss.format == -1)
+    disorder_fatal(0, "unsupported uaudio format (%d, %d)",
+                   uaudio_bits, uaudio_signed);
+  ss.channels = uaudio_channels;
+  ss.rate = uaudio_rate;
+  pulseaudio_simple_handle = pa_simple_new(NULL,
+                                           uaudio_get("application", "DisOrder"),
+                                           PA_STREAM_PLAYBACK,
+                                           NULL,
+                                           "DisOrder",
+                                           &ss,
+                                           NULL,
+                                           NULL,
+                                           &error);
+  if(!pulseaudio_simple_handle)
+    disorder_fatal(0, "pa_simple_new: %s", pa_strerror(error));
+}
+
+/** @brief Close the PulseAudio sound device */
+static void pulseaudio_close(void) {
+  pa_simple_free(pulseaudio_simple_handle);
+  pulseaudio_simple_handle = NULL;
+}
+
+/** @brief Actually play sound via PulseAudio */
+static size_t pulseaudio_play(void *buffer, size_t samples,
+                              unsigned attribute((unused)) flags) {
+  int error;
+  int ret = pa_simple_write(pulseaudio_simple_handle,
+                            buffer,
+                            samples * uaudio_sample_size,
+                            &error);
+  if(ret < 0)
+    disorder_fatal(0, "pa_simple_write: %s", pa_strerror(error));
+  return samples;
+}
+
+static void pulseaudio_start(uaudio_callback *callback,
+                             void *userdata) {
+  pulseaudio_open();
+  uaudio_thread_start(callback, userdata, pulseaudio_play,
+                      32 / uaudio_sample_size,
+                      4096 / uaudio_sample_size,
+                      0);
+}
+
+static void pulseaudio_stop(void) {
+  uaudio_thread_stop();
+  pulseaudio_close();
+}
+
+static void pulseaudio_open_mixer(void) {
+  disorder_error(0, "no pulseaudio mixer support yet");
+}
+
+static void pulseaudio_close_mixer(void) {
+}
+
+static void pulseaudio_get_volume(int *left, int *right) {
+  *left = *right = 0;
+}
+
+static void pulseaudio_set_volume(int *left, int *right) {
+  *left = *right = 0;
+}
+
+static void pulseaudio_configure(void) {
+}
+
+const struct uaudio uaudio_pulseaudio = {
+  .name = "pulseaudio",
+  .options = pulseaudio_options,
+  .start = pulseaudio_start,
+  .stop = pulseaudio_stop,
+  .activate = uaudio_thread_activate,
+  .deactivate = uaudio_thread_deactivate,
+  .open_mixer = pulseaudio_open_mixer,
+  .close_mixer = pulseaudio_close_mixer,
+  .get_volume = pulseaudio_get_volume,
+  .set_volume = pulseaudio_set_volume,
+  .configure = pulseaudio_configure,
+  .flags = UAUDIO_API_CLIENT,
+};
+
+#endif
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/