1 files changed, 67 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-dmix.c b/plugins/alsa/alsa-dmix.c
new file mode 100644
index 0000000..b162d04
--- /dev/null
+++ b/plugins/alsa/alsa-dmix.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2018 "IoT.bzh"
+ * Author Fulup Ar Foll <fulup@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#define _GNU_SOURCE  // needed for vasprintf
+
+#include "alsa-softmixer.h"
+
+static int uniqueIpcIndex = 1024;
+
+
+PUBLIC int AlsaCreateDmix(CtlSourceT *source) {
+
+    AFB_ApiNotice(source->api, "AlsaCreateDmix: start ");
+    
+    int cardid= AlsaCardInfoByPath ("/dev/snd/by-id/usb-Focusrite_Scarlett_18i8_USB_10004EE6-00");
+    AFB_ApiNotice(source->api, "AlsaCreateDmix: cardid=%d ", cardid);
+
+    snd_pcm_t *dmixPcm;
+    snd_config_t *dmixConfig, *slaveConfig, *elemConfig;
+    snd_pcm_stream_t streamPcm = SND_PCM_STREAM_PLAYBACK;
+    int error = 0, streamMode = SND_PCM_NONBLOCK;
+
+
+    error += snd_config_top(&dmixConfig);
+    error += snd_config_imake_integer(&elemConfig, "ipc_key", uniqueIpcIndex++);
+    error += snd_config_add(dmixConfig, elemConfig);
+    if (error) goto OnErrorExit;
+
+    error += snd_config_make_compound(&slaveConfig, "slave", 0);
+    error += snd_config_imake_string(&elemConfig, "pcm", "hw:6");
+    error += snd_config_add(slaveConfig, elemConfig);
+    if (error) goto OnErrorExit;
+
+    // add leaf into config
+    error += snd_config_add(dmixConfig, slaveConfig);
+    if (error) goto OnErrorExit;
+    
+    snd_config_update();
+    AlsaDumpConfig (source, snd_config, 1);
+    AlsaDumpConfig (source, dmixConfig, 1);
+
+
+   int status = _snd_pcm_dmix_open(&dmixPcm, "MyDMix", snd_config, dmixConfig, streamPcm , streamMode); 
+
+    AFB_ApiNotice(source->api, "AlsaCreateDmix: done");
+
+    return status;
+
+OnErrorExit:
+    AFB_ApiNotice(source->api, "AlsaCreateDmix: OnErrorExit");
+    return 1;
+}
+\ No newline at end of file