1 files changed, 81 insertions, 0 deletions

diff --git a/plugins/alsa/alsa-plug-rate.c b/plugins/alsa/alsa-plug-rate.c
new file mode 100644
index 0000000..a9b9e23
--- /dev/null
+++ b/plugins/alsa/alsa-plug-rate.c
@@ -0,0 +1,81 @@
+/*
+ * 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"
+
+
+ALSA_PLUG_PROTO(rate);
+
+
+PUBLIC AlsaPcmInfoT* AlsaCreateRate(CtlSourceT *source, const char* pcmName, AlsaPcmInfoT *pcmSlave, int open) {
+   
+    snd_config_t *rateConfig, *slaveConfig, *elemConfig, *pcmConfig;
+    AlsaPcmInfoT *pcmPlug= calloc(1,sizeof(AlsaPcmInfoT));
+    pcmPlug->uid= strdup(pcmName);
+    pcmPlug->cardid=pcmPlug->uid;
+
+    int error=0;
+
+    // refresh global alsalib config and create PCM top config
+    snd_config_update();
+    error += snd_config_top(&rateConfig);
+    error += snd_config_set_id (rateConfig, pcmPlug->cardid);
+    error += snd_config_imake_string(&elemConfig, "type", "plug");
+    error += snd_config_add(rateConfig, elemConfig);
+    if (error) goto OnErrorExit;
+
+    error += snd_config_make_compound(&slaveConfig, "slave", 0);
+    error += snd_config_imake_string(&elemConfig, "pcm", pcmSlave->cardid);
+    if (pcmSlave->params.rate) {
+        error += snd_config_add(slaveConfig, elemConfig);
+        // *** error += snd_config_imake_integer(&elemConfig, "rate", pcmSlave->params.rate);
+        error += snd_config_imake_integer(&elemConfig, "rate", 48000);
+    }
+    error += snd_config_add(slaveConfig, elemConfig);
+    if (error) goto OnErrorExit;
+
+    // add leaf into config
+    error += snd_config_add(rateConfig, slaveConfig);
+    if (error) goto OnErrorExit;
+       
+    error += snd_config_search(snd_config, "pcm", &pcmConfig);    
+    error += snd_config_add(pcmConfig, rateConfig);
+    if (error) {
+        AFB_ApiError(source->api, "AlsaCreateRate: fail to add configRATE=%s", pcmPlug->cardid);
+        goto OnErrorExit;
+    }
+    
+    if (open) error = _snd_pcm_rate_open(&pcmPlug->handle, pcmPlug->cardid, snd_config, rateConfig, SND_PCM_STREAM_PLAYBACK , SND_PCM_NONBLOCK); 
+    if (error) {
+        AFB_ApiError(source->api, "AlsaCreateRate: fail to create Rate=%s Slave=%s Error=%s", pcmPlug->cardid, pcmSlave->cardid, snd_strerror(error));
+        goto OnErrorExit;
+    }
+    
+    // Debug config & pcm
+    AlsaDumpCtlConfig (source, "plug-rate", pcmConfig, 1);
+    //AlsaDumpCtlConfig (source, "plug-rate", rateConfig, 1);
+    AFB_ApiNotice(source->api, "AlsaCreateRate: %s done\n", pcmPlug->cardid);
+    return pcmPlug;
+
+OnErrorExit:
+    AlsaDumpCtlConfig(source, "plug-rate", rateConfig, 1);
+    AFB_ApiNotice(source->api, "AlsaCreateRate: OnErrorExit\n");
+    return NULL;
+}
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