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-rw-r--r--plugins/alsa/alsa-plug-route.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-plug-route.c b/plugins/alsa/alsa-plug-route.c
new file mode 100644
index 0000000..dc75b56
--- /dev/null
+++ b/plugins/alsa/alsa-plug-route.c
@@ -0,0 +1,140 @@
+/*
+ * 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(route);
+
+STATIC int CardChannelByUid(CtlSourceT *source, AlsaPcmInfoT *pcmBackend, const char *uid) {
+ int channelIdx = -1;
+
+ // search for channel within all sound card backend (channel port target is computed by order)
+ int targetIdx=0;
+ for (int cardIdx = 0; pcmBackend[cardIdx].uid != NULL; cardIdx++) {
+ AlsaPcmChannels *channels = pcmBackend[cardIdx].channels;
+ if (!channels) {
+ AFB_ApiError(source->api, "CardChannelByUid: No Backend card=%s [should declare channels]", pcmBackend[cardIdx].uid);
+ goto OnErrorExit;
+ }
+
+ for (int idx = 0; channels[idx].uid != NULL; idx++) {
+ if (!strcmp(channels[idx].uid, uid)) return targetIdx;
+ targetIdx++;
+ }
+ }
+
+ // this is OnErrorExit
+ return channelIdx;
+
+OnErrorExit:
+ return -1;
+}
+
+PUBLIC AlsaPcmInfoT* AlsaCreateRoute(CtlSourceT *source, AlsaSndZoneT *zone) {
+
+ snd_config_t *routeConfig, *elemConfig, *slaveConfig, *tableConfig, *pcmConfig;
+ int error = 0;
+ AlsaPcmInfoT *pcmPlug = calloc(1, sizeof (AlsaPcmInfoT));
+ pcmPlug->uid = zone->uid;
+ pcmPlug->cardid = zone->uid;
+
+ AlsaPcmInfoT *pcmBackend = Softmixer->sndcardCtl;
+ AlsaPcmInfoT* pcmSlave=Softmixer->multiPcm;
+ if (!pcmBackend || !pcmSlave) {
+ AFB_ApiError(source->api, "AlsaCreateRoute:zone(%s)(zone) No Sound Card Ctl find [should register snd_cards first]", zone->uid);
+ goto OnErrorExit;
+ }
+
+ // refresh global alsalib config and create PCM top config
+ snd_config_update();
+ error += snd_config_top(&routeConfig);
+ error += snd_config_set_id(routeConfig, pcmPlug->cardid);
+ error += snd_config_imake_string(&elemConfig, "type", "route");
+ error += snd_config_add(routeConfig, elemConfig);
+ error += snd_config_make_compound(&slaveConfig, "slave", 0);
+ error += snd_config_imake_string(&elemConfig, "pcm", pcmSlave->cardid);
+ error += snd_config_add(slaveConfig, elemConfig);
+ error += snd_config_imake_integer(&elemConfig, "channels", pcmSlave->ccount);
+ error += snd_config_add(slaveConfig, elemConfig);
+ error += snd_config_add(routeConfig, slaveConfig);
+ error += snd_config_make_compound(&tableConfig, "ttable", 0);
+ error += snd_config_add(routeConfig, tableConfig);
+ if (error) goto OnErrorExit;
+
+ // tempry store to unable multiple channel to route to the same port
+ snd_config_t **cports;
+ cports = alloca(sizeof (snd_config_t*)*(pcmSlave->ccount + 1));
+ memset(cports, 0, (sizeof (snd_config_t*)*(pcmSlave->ccount + 1)));
+
+ // loop on sound card to include into multi
+ for (int idx = 0; zone->channels[idx].uid != NULL; idx++) {
+
+ int target = CardChannelByUid(source, pcmBackend, zone->channels[idx].uid);
+ if (target < 0) {
+ AFB_ApiError(source->api, "AlsaCreateRoute:zone(%s) fail to find channel=%s", zone->uid, zone->channels[idx].uid);
+ goto OnErrorExit;
+ }
+
+ int channel = zone->channels[idx].port;
+ double volume = 1.0; // currently only support 100%
+
+ // if channel entry does not exit into ttable create it now
+ if (!cports[channel]) {
+ pcmPlug->ccount++;
+ char channelS[4]; // 999 channel should be more than enough
+ snprintf(channelS, sizeof (channelS), "%d", channel);
+ error += snd_config_make_compound(&cports[channel], channelS, 0);
+ error += snd_config_add(tableConfig, cports[channel]);
+ }
+
+ // ttable require target port as a table and volume as a value
+ char targetS[4];
+ snprintf(targetS, sizeof (targetS), "%d", target);
+ error += snd_config_imake_real(&elemConfig, targetS, volume);
+ error += snd_config_add(cports[channel], elemConfig);
+ if (error) goto OnErrorExit;
+ }
+
+ // update top config to access previous plugin PCM
+ snd_config_update();
+
+ error = _snd_pcm_route_open(&pcmPlug->handle, zone->uid, snd_config, routeConfig, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
+ if (error) {
+ AFB_ApiError(source->api, "AlsaCreateRoute:zone(%s) fail to create Plug=%s error=%s", zone->uid, pcmPlug->cardid, snd_strerror(error));
+ goto OnErrorExit;
+ }
+
+ error += snd_config_search(snd_config, "pcm", &pcmConfig);
+ error += snd_config_add(pcmConfig, routeConfig);
+ if (error) {
+ AFB_ApiError(source->api, "AlsaCreateDmix:%s fail to add configDMIX=%s", zone->uid, pcmPlug->cardid);
+ goto OnErrorExit;
+ }
+
+ // Debug config & pcm
+ AlsaDumpCtlConfig(source, "plug-route", routeConfig, 1);
+ AFB_ApiNotice(source->api, "AlsaCreateRoute:zone(%s) done\n", zone->uid);
+ return pcmPlug;
+
+OnErrorExit:
+ AlsaDumpCtlConfig(source, "plug-route", routeConfig, 1);
+ AFB_ApiNotice(source->api, "AlsaCreateRoute:zone(%s) OnErrorExit\n", zone->uid);
+ return NULL;
+} \ No newline at end of file