Initial version with dynamic APIs

1 files changed, 179 insertions, 0 deletions

diff --git a/plugins/alsa/alsa-api-frontend.c b/plugins/alsa/alsa-api-frontend.c
new file mode 100644
index 0000000..c01a88b
--- /dev/null
+++ b/plugins/alsa/alsa-api-frontend.c
@@ -0,0 +1,179 @@
+/*
+ * 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>
+
+// Fulup need to be cleanup with new controller version
+extern Lua2cWrapperT Lua2cWrap;
+
+STATIC int ProcessOneSubdev(CtlSourceT *source, AlsaSndLoopT *loop,  json_object *subdevJ, AlsaPcmHwInfoT *loopDefParams,AlsaPcmInfoT *subdev) {
+    json_object *paramsJ = NULL;
+    
+    int error = wrap_json_unpack(subdevJ, "{si,si,s?o !}", "subdev", &subdev->subdev, "numid", &subdev->numid, "params", &paramsJ);
+    if (error) {
+        AFB_ApiError(source->api, "ProcessOneSubdev: loop=%s missing (uid|subdev|numid) json=%s", loop->uid, json_object_get_string(subdevJ));
+        goto OnErrorExit;
+    }
+
+    if (paramsJ) {
+        error = ProcessSndParams(source, loop->uid, paramsJ, loopDefParams);
+        if (error) {
+            AFB_ApiError(source->api, "ProcessOneLoop: sndcard=%s invalid params=%s", loop->uid, json_object_get_string(paramsJ));
+            goto OnErrorExit;
+        }
+    } else {
+        // use global loop params definition as default
+        memcpy (&subdev->params, loopDefParams, sizeof(AlsaPcmHwInfoT));
+    }
+    // create a fake uid and complete subdev info from loop handle
+    char subuid[30];
+    snprintf(subuid, sizeof (subuid), "loop:/%i/%i", subdev->subdev, subdev->numid);
+    subdev->uid = strdup(subuid);
+    subdev->device = loop->capture; // Fulup: with alsaloop softmixer only use capture device (playback is used by applications)
+    subdev->devpath = loop->devpath;
+    subdev->cardid = NULL; // force AlsaByPathDevId to rebuild a new one for each subdev
+    subdev->cardidx = loop->cardidx;
+
+    // check if card exist
+    error = AlsaByPathDevid(source, subdev);
+    if (error) {
+        AFB_ApiError(source->api, "ProcessOneSubdev: loop=%s fail to open subdev=%s", loop->uid, json_object_get_string(subdevJ));
+        goto OnErrorExit;
+    }
+
+    return 0;
+
+OnErrorExit:
+    return -1;
+}
+
+STATIC int ProcessOneLoop(CtlSourceT *source, json_object *loopJ, AlsaSndLoopT *loop) {
+    json_object *subdevsJ = NULL, *devicesJ = NULL, *paramsJ = NULL;
+    int error;
+
+    error = wrap_json_unpack(loopJ, "{ss,s?s,s?s,s?i,s?o,so,s?o !}", "uid", &loop->uid, "devpath", &loop->devpath, "cardid", &loop->cardid
+            , "cardidx", &loop->cardidx, "devices", &devicesJ, "subdevs", &subdevsJ, "params", &paramsJ);
+    if (error || !loop->uid || !subdevsJ || (!loop->devpath && !loop->cardid && loop->cardidx)) {
+        AFB_ApiNotice(source->api, "ProcessOneLoop missing 'uid|devpath|cardid|cardidx|devices|subdevs' loop=%s", json_object_get_string(loopJ));
+        goto OnErrorExit;
+    }
+
+    AlsaPcmHwInfoT *loopDefParams =alloca(sizeof(AlsaPcmHwInfoT));
+    if (paramsJ) {
+        error = ProcessSndParams(source, loop->uid, paramsJ, loopDefParams);
+        if (error) {
+            AFB_ApiError(source->api, "ProcessOneLoop: sndcard=%s invalid params=%s", loop->uid, json_object_get_string(paramsJ));
+            goto OnErrorExit;
+        }
+    } else {
+        loopDefParams->rate = ALSA_DEFAULT_PCM_RATE;
+        loopDefParams->rate= ALSA_DEFAULT_PCM_RATE;
+        loopDefParams->access=SND_PCM_ACCESS_RW_INTERLEAVED;
+        loopDefParams->format=SND_PCM_FORMAT_S16_LE;
+        loopDefParams->channels=2; 
+        loopDefParams->sampleSize=0;
+    }
+
+    // make sure useful information will not be removed
+    loop->uid = strdup(loop->uid);
+    if (loop->cardid) loop->cardid = strdup(loop->cardid);
+    if (loop->devpath) loop->cardid = strdup(loop->devpath);
+
+    // Default devices is payback=0 capture=1
+    if (!devicesJ) {
+        loop->playback = 0;
+        loop->capture = 1;
+    } else {
+        error = wrap_json_unpack(devicesJ, "{si,si !}", "capture", &loop->capture, "playback", &loop->playback);
+        if (error) {
+            AFB_ApiNotice(source->api, "ProcessOneLoop=%s missing 'capture|playback' devices=%s", loop->uid, json_object_get_string(devicesJ));
+            goto OnErrorExit;
+        }
+    }
+
+    switch (json_object_get_type(subdevsJ)) {
+        case json_type_object:
+            loop->scount = 1;
+            loop->subdevs = calloc(loop->scount + 1, sizeof (AlsaPcmInfoT));
+            error = ProcessOneSubdev(source, loop, subdevsJ, loopDefParams, &loop->subdevs[0]);
+            if (error) goto OnErrorExit;
+            break;
+        case json_type_array:
+            loop->scount = (int) json_object_array_length(subdevsJ);
+            loop->subdevs = calloc(loop->scount + 1, sizeof (AlsaPcmInfoT));
+            for (int idx = 0; idx < loop->scount; idx++) {
+                json_object *subdevJ = json_object_array_get_idx(subdevsJ, idx);
+                error = ProcessOneSubdev(source, loop, subdevJ, loopDefParams, &loop->subdevs[idx]);
+                if (error) goto OnErrorExit;
+            }
+            break;
+        default:
+            AFB_ApiError(source->api, "ProcessOneLoop=%s invalid subdevs= %s", loop->uid, json_object_get_string(subdevsJ));
+            goto OnErrorExit;
+    }
+
+    return 0;
+
+OnErrorExit:
+    return -1;
+}
+
+PUBLIC int SndFrontend (CtlSourceT *source, json_object *argsJ) {
+    SoftMixerHandleT *mixerHandle = (SoftMixerHandleT*) source->context;
+    int error;
+    
+    assert (mixerHandle);  
+    
+    if (mixerHandle->loop) {
+        AFB_ApiError(source->api, "SndFrontend: mixer=%s SndFrontend already declared %s", mixerHandle->uid, json_object_get_string(argsJ));
+        goto OnErrorExit;     
+    }
+    
+    mixerHandle->loop= calloc(1, sizeof (AlsaSndLoopT));
+    
+    // or syntax purpose array is accepted but frontend should have a single driver entry
+    json_type type= json_object_get_type(argsJ);
+    if (type == json_type_array) {
+        size_t count= json_object_array_length(argsJ);
+        if (count != 1) {
+            AFB_ApiError(source->api, "SndFrontend: mixer=%s frontend only support on input driver args=%s", mixerHandle->uid, json_object_get_string(argsJ));
+            goto OnErrorExit;            
+        }
+        argsJ= json_object_array_get_idx(argsJ,0);
+    } 
+    
+    type= json_object_get_type(argsJ);
+    if (type != json_type_object) {
+        AFB_ApiError(source->api, "SndFrontend: mixer=%s invalid object type= %s", mixerHandle->uid, json_object_get_string(argsJ));
+        goto OnErrorExit;
+    }
+
+    error = ProcessOneLoop(source, argsJ, mixerHandle->loop);
+    if (error) {
+        AFB_ApiError(source->api, "SndFrontend: mixer=%s invalid object= %s", mixerHandle->uid, json_object_get_string(argsJ));
+        goto OnErrorExit;
+    }
+
+    return 0;
+
+OnErrorExit:
+    return -1;
+}
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