Move to Dynamic Mixer API (work in progress)

1 files changed, 205 insertions, 0 deletions

diff --git a/plugins/alsa/alsa-api-loop.c b/plugins/alsa/alsa-api-loop.c
new file mode 100644
index 0000000..9a746ea
--- /dev/null
+++ b/plugins/alsa/alsa-api-loop.c
@@ -0,0 +1,205 @@
+/*
+ * 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>
+
+PUBLIC AlsaLoopSubdevT *ApiLoopFindSubdev(SoftMixerT *mixer, const char *streamUid, const char *targetUid, AlsaSndLoopT **loop) {
+
+    // Either allocate a free loop subdev or search for a specific targetUid when specified
+    if (targetUid) {
+        for (int idx = 0; mixer->loops[idx]; idx++) {
+            for (int jdx = 0; jdx < mixer->loops[idx]->scount; jdx++) {
+                if (mixer->loops[idx]->subdevs[jdx]->uid && !strcasecmp(mixer->loops[idx]->subdevs[jdx]->uid, targetUid)) {
+                    *loop = mixer->loops[idx];
+                    return mixer->loops[idx]->subdevs[jdx];
+                }
+            }
+        }
+    } else {
+        for (int idx = 0; mixer->loops[idx]; idx++) {
+            for (int jdx = 0; mixer->loops[idx]->subdevs[jdx]; jdx++) {
+                if (!mixer->loops[idx]->subdevs[jdx]->uid) {
+                    mixer->loops[idx]->subdevs[jdx]->uid = streamUid;
+                    *loop = mixer->loops[idx];
+                    return mixer->loops[idx]->subdevs[jdx];
+                }
+            }
+        }
+    }
+    return NULL;
+}
+
+STATIC AlsaLoopSubdevT *ProcessOneSubdev(SoftMixerT *mixer, AlsaSndLoopT *loop, json_object *subdevJ) {
+    AlsaLoopSubdevT *subdev = calloc(1, sizeof (AlsaPcmCtlT));
+
+    int error = wrap_json_unpack(subdevJ, "{s?s, si,si,s?o !}"
+            , "uid", &subdev->uid
+            , "subdev", &subdev->index
+            , "numid", &subdev->numid
+            );
+    if (error) {
+        AFB_ApiError(mixer->api, "ProcessOneSubdev: loop=%s missing (uid|subdev|numid) error=%s json=%s", loop->uid, wrap_json_get_error_string(error),json_object_get_string(subdevJ));
+        goto OnErrorExit;
+    }
+
+    // subdev with no UID are dynamically attached
+    if (subdev->uid) subdev->uid = strdup(subdev->uid);
+
+    // create loop subdev entry point with cardidx+device+subdev in order to open subdev and not sndcard
+    AlsaDevInfoT loopSubdev;
+    loopSubdev.devpath=NULL;
+    loopSubdev.cardid=NULL;
+    loopSubdev.cardidx = loop->sndcard->cid.cardidx;
+    loopSubdev.device = loop->capture;
+    loopSubdev.subdev = subdev->index;
+
+    // assert we may open this loopback subdev in capture mode
+    AlsaPcmCtlT *pcmInfo = AlsaByPathOpenPcm(mixer, &loopSubdev, SND_PCM_STREAM_CAPTURE);
+    if (!pcmInfo) goto OnErrorExit;
+
+    // free PCM as we only open loop to assert it's a valid capture device
+    snd_pcm_close(pcmInfo->handle);
+    free(pcmInfo);
+
+    return subdev;
+
+OnErrorExit:
+    return NULL;
+}
+
+STATIC AlsaSndLoopT *AttachOneLoop(SoftMixerT *mixer, const char *uid, json_object *argsJ) {
+    AlsaSndLoopT *loop = calloc(1, sizeof (AlsaSndLoopT));
+    json_object *subdevsJ = NULL, *devicesJ = NULL;
+    int error;
+
+    loop->sndcard = (AlsaSndCtlT*) calloc(1, sizeof (AlsaSndCtlT));
+    error = wrap_json_unpack(argsJ, "{ss,s?s,s?s,so,so !}"
+            , "uid", &loop->uid
+            , "path", &loop->sndcard->cid.devpath
+            , "cardid", &loop->sndcard->cid.cardid
+            , "devices", &devicesJ
+            , "subdevs", &subdevsJ
+            );
+    if (error || !loop->uid || !subdevsJ || (!loop->sndcard->cid.devpath && !loop->sndcard->cid.cardid)) {
+        AFB_ApiNotice(mixer->api, "AttachOneLoop mixer=%s hal=%s missing 'uid|path|cardid|devices|subdevs' error=%s args=%s", mixer->uid, uid, wrap_json_get_error_string(error),json_object_get_string(argsJ));
+        goto OnErrorExit;
+    }
+
+    // try to open sound card control interface
+    loop->sndcard->ctl = AlsaByPathOpenCtl(mixer, loop->uid, loop->sndcard);
+    if (!loop->sndcard->ctl) {
+        AFB_ApiError(mixer->api, "AttachOneLoop mixer=%s hal=%s Fail open sndcard loop=%s devpath=%s cardid=%s (please check 'modprobe snd_aloop')", mixer->uid, uid, loop->uid, loop->sndcard->cid.devpath, loop->sndcard->cid.cardid);
+        goto OnErrorExit;
+    }
+
+    // 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(mixer->api, "AttachOneLoop mixer=%s hal=%s Loop=%s missing 'capture|playback' error=%s devices=%s", mixer->uid, uid, loop->uid, wrap_json_get_error_string(error),json_object_get_string(devicesJ));
+            goto OnErrorExit;
+        }
+    }
+
+    switch (json_object_get_type(subdevsJ)) {
+        case json_type_object:
+            loop->scount = 1;
+            loop->subdevs = calloc(2, sizeof (void*));
+            loop->subdevs[0] = ProcessOneSubdev(mixer, loop, subdevsJ);
+            if (!loop->subdevs[0]) goto OnErrorExit;
+            break;
+        case json_type_array:
+            loop->scount = (int) json_object_array_length(subdevsJ);
+            loop->subdevs = calloc(loop->scount + 1, sizeof (void*));
+            for (int idx = 0; idx < loop->scount; idx++) {
+                json_object *subdevJ = json_object_array_get_idx(subdevsJ, idx);
+                loop->subdevs[idx] = ProcessOneSubdev(mixer, loop, subdevJ);
+                if (!loop->subdevs[idx]) goto OnErrorExit;
+            }
+            break;
+        default:
+            AFB_ApiError(mixer->api, "AttachOneLoop mixer=%s hal=%s Loop=%s invalid subdevs= %s", mixer->uid, uid, loop->uid, json_object_get_string(subdevsJ));
+            goto OnErrorExit;
+    }
+
+    // we may have to register up to 3 control per subdevice (vol, pause, actif)
+    loop->sndcard->registry = calloc(loop->scount * SMIXER_SUBDS_CTLS + 1, sizeof (RegistryEntryPcmT));
+    loop->sndcard->rcount = loop->scount*SMIXER_SUBDS_CTLS;
+
+    return loop;
+
+OnErrorExit:
+    return NULL;
+}
+
+PUBLIC int ApiLoopAttach(SoftMixerT *mixer, AFB_ReqT request, const char *uid, json_object * argsJ) {
+
+    int index;
+    for (index = 0; index < mixer->max.loops; index++) {
+        if (!mixer->loops[index]) break;
+    }
+
+    if (index == mixer->max.loops) {
+        AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max loop=%d argsJ= %s", mixer->uid, uid, mixer->max.loops, json_object_get_string(argsJ));
+        goto OnErrorExit;
+    }
+
+    switch (json_object_get_type(argsJ)) {
+            size_t count;
+
+        case json_type_object:
+            mixer->loops[index] = AttachOneLoop(mixer, uid, argsJ);
+            if (!mixer->loops[index]) {
+                AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s invalid loop= %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.loops - count)) {
+                AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max loop=%d argsJ= %s", mixer->uid, uid, mixer->max.loops, json_object_get_string(argsJ));
+                goto OnErrorExit;
+
+            }
+
+            for (int idx = 0; idx < count; idx++) {
+                json_object *loopJ = json_object_array_get_idx(argsJ, idx);
+                mixer->loops[index + idx] = AttachOneLoop(mixer, uid, loopJ);
+                if (!mixer->loops[index + idx]) {
+                    AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s invalid loop= %s", mixer->uid, uid, json_object_get_string(loopJ));
+                    goto OnErrorExit;
+                }
+            }
+            break;
+        default:
+            AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s loops invalid argsJ= %s", mixer->uid, uid, json_object_get_string(argsJ));
+            goto OnErrorExit;
+    }
+
+    return 0;
+
+OnErrorExit:
+    return -1;
+}
\ No newline at end of file