1 files changed, 114 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-api-ramp.c b/plugins/alsa/alsa-api-ramp.c
new file mode 100644
index 0000000..002aec0
--- /dev/null
+++ b/plugins/alsa/alsa-api-ramp.c
@@ -0,0 +1,114 @@
+/*
+ * 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"
+#include <string.h>
+
+// Set stream volume control in %
+#define VOL_CONTROL_MAX  100
+#define VOL_CONTROL_MIN  0
+#define VOL_CONTROL_STEP 1
+
+PUBLIC AlsaVolRampT *ApiRampGetByUid(SoftMixerT *mixer, const char *uid) {
+    AlsaVolRampT *ramp = NULL;
+
+    // Loop on every Register zone pcm and extract (cardid) from (uid)
+    for (int idx = 0; mixer->ramps[idx]->uid != NULL; idx++) {
+        if (!strcasecmp(mixer->ramps[idx]->uid, uid)) {
+            ramp = mixer->ramps[idx];
+            return ramp;
+        }
+    }
+    return NULL;
+}
+
+STATIC AlsaVolRampT *AttachOneRamp(SoftMixerT *mixer, const char *uid, json_object *rampJ) {
+    const char*rampUid;
+    AlsaVolRampT *ramp = calloc(1, sizeof (AlsaVolRampT));
+
+    int error = wrap_json_unpack(rampJ, "{ss,si,si,si !}"
+            , "uid", &rampUid
+            , "delay", &ramp->delay
+            , "up", &ramp->stepUp
+            , "down", &ramp->stepDown
+            );
+    if (error) {
+        AFB_ApiError(mixer->api, "AttachOneRamp mixer=%s hal=%s error=%s json=%s", mixer->uid, uid, wrap_json_get_error_string(error), json_object_get_string(rampJ));
+        goto OnErrorExit;
+    }
+
+    ramp->delay = ramp->delay * 100; // move from ms to us
+    ramp->uid = strdup(rampUid);
+    return ramp;
+
+OnErrorExit:
+    free(ramp);
+    return NULL;
+}
+
+PUBLIC int ApiRampAttach(SoftMixerT *mixer, AFB_ReqT request, const char *uid, json_object *argsJ) {
+    int index;
+
+    for (index = 0; index < mixer->max.ramps; index++) {
+        if (!mixer->ramps[index]) break;
+    }
+
+    if (index == mixer->max.ramps) {
+        AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max ramp=%d argsJ= %s", mixer->uid, uid, mixer->max.ramps, json_object_get_string(argsJ));
+        goto OnErrorExit;
+    }
+
+    switch (json_object_get_type(argsJ)) {
+        long count;
+        
+        case json_type_object:
+            mixer->ramps[index] = AttachOneRamp(mixer, uid, argsJ);
+            if (!mixer->ramps[index]) {
+                AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s invalid ramp= %s", mixer->uid, uid, json_object_get_string(argsJ));
+                goto OnErrorExit;
+            }
+            break;
+
+        case json_type_array:
+            count = json_object_array_length(argsJ);
+            if (count > (mixer->max.ramps - count)) {
+                AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max ramp=%d argsJ= %s", mixer->uid, uid, mixer->max.ramps, json_object_get_string(argsJ));
+                goto OnErrorExit;
+
+            }
+
+            for (int idx = 0; idx < count; idx++) {
+                json_object *streamAudioJ = json_object_array_get_idx(argsJ, idx);
+                mixer->ramps[index + idx] = AttachOneRamp(mixer, uid, streamAudioJ);
+                if (!mixer->ramps[index + idx]) {
+                    AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s invalid ramp= %s", mixer->uid, uid, json_object_get_string(streamAudioJ));
+                    goto OnErrorExit;
+                }
+            }
+            break;
+        default:
+            AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s ramps invalid argsJ= %s", mixer->uid, uid, json_object_get_string(argsJ));
+            goto OnErrorExit;
+    }
+    return 0;
+
+OnErrorExit:
+    return -1;
+}