Initial version with softvol,Route,Multi,Dmix

1 files changed, 166 insertions, 0 deletions

diff --git a/plugins/alsa/alsa-api-sndcards.c b/plugins/alsa/alsa-api-sndcards.c
new file mode 100644
index 0000000..d48abd8
--- /dev/null
+++ b/plugins/alsa/alsa-api-sndcards.c
@@ -0,0 +1,166 @@
+/*
+ * 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"
+
+// Fulup need to be cleanup with new controller version
+extern Lua2cWrapperT Lua2cWrap;
+
+STATIC int ProcessOneChannel(CtlSourceT *source, const char* uid, json_object *channelJ, AlsaPcmChannels *channel) {
+    const char*channelUid;
+    
+    int error = wrap_json_unpack(channelJ, "{ss,si !}", "uid", &channelUid, "port", &channel->port);
+    if (error) goto OnErrorExit;
+
+    channel->uid=strdup(channelUid);
+    return 0;
+
+OnErrorExit:
+    AFB_ApiError(source->api, "ProcessOneChannel: sndcard=%s channel: missing (uid||port) json=%s", uid, json_object_get_string(channelJ));    
+    return -1;
+}
+
+STATIC int ProcessSndParams(CtlSourceT *source, const char* uid, json_object *paramsJ, AlsaPcmHwInfoT *params) {
+    
+    int error = wrap_json_unpack(paramsJ, "{s?i,s?i !}", "rate", &params->rate, "channels", &params->channels);
+    if (error) goto OnErrorExit;
+
+    return 0;
+
+OnErrorExit:
+    AFB_ApiError(source->api, "ProcessSndParams: sndcard=%s params: missing (rate|channel) params=%s", uid, json_object_get_string(paramsJ));    
+    return -1;
+}
+
+STATIC int ProcessOneSndCard(CtlSourceT *source, json_object *sndcardJ, AlsaPcmInfoT *snd) {
+    json_object *sinkJ, *paramsJ=NULL;
+    int error;
+
+    error = wrap_json_unpack(sndcardJ, "{ss,s?s,s?s,s?i,s?i,s?i,so,s?o !}", "uid",&snd->uid, "devpath",&snd->devpath, "cardid",&snd->cardid
+              , "cardidx",&snd->cardidx, "device",&snd->device, "subdev",&snd->subdev, "sink",&sinkJ, "params",&paramsJ);
+    if (error || !snd->uid || !sinkJ || (!snd->devpath && !snd->cardid && snd->cardidx)) {
+        AFB_ApiNotice(source->api, "ProcessOneSndCard missing 'uid|path|cardid|cardidx|channels|device|subdev|numid|params' devin=%s", json_object_get_string(sndcardJ));
+        goto OnErrorExit;
+    }
+    
+    if (paramsJ) error= ProcessSndParams(source, snd->uid, paramsJ, &snd->params);
+    if (error) {
+        AFB_ApiError(source->api, "ProcessOneSndCard: sndcard=%s invalid params=%s", snd->uid, json_object_get_string(paramsJ));
+        goto OnErrorExit;
+    }
+        
+    
+    // check snd card is accessible
+    error = AlsaByPathDevid(source, snd);
+    if (error) {
+        AFB_ApiError(source->api, "ProcessOneSndCard: sndcard=%s not found config=%s", snd->uid, json_object_get_string(sndcardJ));
+        goto OnErrorExit;
+    }
+    
+    // protect each sndcard with a dmix plugin to enable audio-stream mixing
+    AlsaPcmInfoT *dmixPcm= AlsaCreateDmix(source, snd->uid, snd);
+    if (!dmixPcm) {
+        AFB_ApiError(source->api, "ProcessOneSndCard: sndcard=%s fail to attach dmix plugin", snd->uid);
+        goto OnErrorExit;        
+    } else {
+        snd_pcm_close(dmixPcm->handle);
+        snd->cardid=dmixPcm->cardid;
+    }
+
+    switch (json_object_get_type(sinkJ)) {
+        case json_type_object:
+            snd->ccount=1;
+            snd->channels = calloc(snd->ccount+1, sizeof (AlsaPcmChannels));
+            error = ProcessOneChannel(source, snd->uid, sndcardJ, &snd->channels[0]);
+            if (error) goto OnErrorExit;
+            break;
+        case json_type_array:
+            snd->ccount = (int)json_object_array_length(sinkJ);
+            snd->channels = calloc(snd->ccount+1, sizeof (AlsaPcmChannels));
+            for (int idx = 0; idx < snd->ccount; idx++) {
+                json_object *channelJ = json_object_array_get_idx(sinkJ, idx);
+                error = ProcessOneChannel(source, snd->uid, channelJ, &snd->channels[idx]);
+                if (error) goto OnErrorExit;
+            }
+            break;
+        default:
+            AFB_ApiError(source->api, "ProcessOneSndCard:%s invalid sink=%s", snd->uid, json_object_get_string(sinkJ));
+            goto OnErrorExit;
+    }
+
+    return 0;
+
+OnErrorExit:
+    return -1;
+}
+
+CTLP_LUA2C(snd_cards, source, argsJ, responseJ) {
+    AlsaPcmInfoT *sndcards;
+ 
+    int error;
+    size_t count;
+
+    switch (json_object_get_type(argsJ)) {
+        case json_type_object:
+            count= 1;
+            sndcards = calloc(count + 1, sizeof (AlsaPcmInfoT));
+            error = ProcessOneSndCard(source, argsJ, &sndcards[0]);
+            if (error) goto OnErrorExit;
+            break;
+        case json_type_array:
+            count = json_object_array_length(argsJ);
+            sndcards = calloc(count + 1, sizeof (AlsaPcmInfoT));
+            for (int idx = 0; idx < count; idx++) {
+                json_object *sndcardJ = json_object_array_get_idx(argsJ, idx);
+                error = ProcessOneSndCard(source, sndcardJ, &sndcards[idx]);
+                if (error) goto OnErrorExit;
+            }
+            break;
+        default:
+            AFB_ApiError(source->api, "L2C:sndcards: invalid argsJ=  %s", json_object_get_string(argsJ));
+            goto OnErrorExit;
+    }
+
+    // register Sound card and multi when needed
+    Softmixer->sndcardCtl= sndcards;
+    
+    if (count == 1) {
+        
+        // only one sound card we multi would be useless
+        Softmixer->multiPcm = &sndcards[0];
+        
+    } else {
+        AlsaPcmInfoT *pcmMulti;
+        
+        // instantiate an alsa multi plugin
+        pcmMulti = AlsaCreateMulti(source, "PcmMulti");
+        if (!pcmMulti) goto OnErrorExit;
+
+        // Close Multi and save into globak handle for further use
+        snd_pcm_close(pcmMulti->handle); 
+        Softmixer->multiPcm= pcmMulti;
+    }
+
+    return 0;
+
+OnErrorExit:
+    AFB_ApiNotice(source->api, "L2C:sndcards fail to process: %s", json_object_get_string(argsJ));
+    return -1;
+}