aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/alsa/alsa-plug-multi.c
diff options
context:
space:
mode:
Diffstat (limited to 'plugins/alsa/alsa-plug-multi.c')
-rw-r--r--plugins/alsa/alsa-plug-multi.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-plug-multi.c b/plugins/alsa/alsa-plug-multi.c
new file mode 100644
index 0000000..d6ef46e
--- /dev/null
+++ b/plugins/alsa/alsa-plug-multi.c
@@ -0,0 +1,105 @@
+/*
+ * 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(multi);
+
+PUBLIC AlsaPcmInfoT* AlsaCreateMulti(CtlSourceT *source, const char *pcmUid) {
+
+ snd_config_t *multiConfig, *elemConfig, *slavesConfig, *slaveConfig, *bindingsConfig, *bindingConfig, *pcmConfig;
+ int error = 0, channelIdx=0;
+ AlsaPcmInfoT *pcmPlug = calloc(1, sizeof (AlsaPcmInfoT));
+ pcmPlug->uid = pcmUid;
+ pcmPlug->cardid = pcmUid;
+
+ AlsaPcmInfoT* pcmSlaves=Softmixer->sndcardCtl;
+ if (!Softmixer->sndcardCtl) {
+ AFB_ApiError(source->api, "AlsaCreateMulti: No Sound Card find [should register snd_cards first]");
+ goto OnErrorExit;
+ }
+
+ // refresh global alsalib config and create PCM top config
+ snd_config_update();
+ error += snd_config_top(&multiConfig);
+ error += snd_config_set_id (multiConfig, pcmPlug->cardid);
+ error += snd_config_imake_string(&elemConfig, "type", "multi");
+ error += snd_config_add(multiConfig, elemConfig);
+ if (error) goto OnErrorExit;
+
+ error += snd_config_make_compound(&slavesConfig, "slaves", 0);
+ error += snd_config_make_compound(&bindingsConfig, "bindings", 0);
+
+ // loop on sound card to include into multi
+ for (int idx = 0; pcmSlaves[idx].uid != NULL; idx++) {
+ AlsaPcmInfoT* sndcard=&pcmSlaves[idx];
+ AlsaPcmChannels *channels = sndcard->channels;
+
+ for (channelIdx=0; channels[channelIdx].uid != NULL; channelIdx++) {
+ char idxS[4]; // 999 channel should be more than enough
+ snprintf (idxS, sizeof(idxS), "%d", pcmPlug->ccount++);
+ // multi does not support to name channels
+ error += snd_config_make_compound(&bindingConfig,idxS, 0);
+ error += snd_config_imake_string(&elemConfig, "slave", sndcard->cardid);
+ error += snd_config_add(bindingConfig, elemConfig);
+ error += snd_config_imake_integer(&elemConfig,"channel", channelIdx);
+ error += snd_config_add(bindingConfig, elemConfig);
+ error += snd_config_add(bindingsConfig, bindingConfig);
+ }
+
+ error += snd_config_make_compound(&slaveConfig, sndcard->uid, 0);
+ error += snd_config_imake_string(&elemConfig, "pcm", sndcard->cardid);
+ error += snd_config_add(slaveConfig, elemConfig);
+ error += snd_config_imake_integer(&elemConfig, "channels", channelIdx);
+ error += snd_config_add(slaveConfig, elemConfig);
+ error += snd_config_add(slavesConfig, slaveConfig);
+ }
+
+ error += snd_config_add(multiConfig, slavesConfig);
+ error += snd_config_add(multiConfig, bindingsConfig);
+ if (error) goto OnErrorExit;
+
+ // update top config to access previous plugin PCM
+ snd_config_update();
+
+ error = _snd_pcm_multi_open(&pcmPlug->handle, pcmUid, snd_config, multiConfig, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
+ if (error) {
+ AFB_ApiError(source->api, "AlsaCreateMulti: fail to create Plug=%s Error=%s", pcmPlug->cardid, snd_strerror(error));
+ goto OnErrorExit;
+ }
+
+ error += snd_config_search(snd_config, "pcm", &pcmConfig);
+ error += snd_config_add(pcmConfig, multiConfig);
+ if (error) {
+ AFB_ApiError(source->api, "AlsaCreateDmix: fail to add configDMIX=%s", pcmPlug->cardid);
+ goto OnErrorExit;
+ }
+
+ // Debug config & pcm
+ //AlsaDumpCtlConfig(source, "plug-multi", multiConfig, 1);
+ //AlsaDumpPcmInfo(source, pcmPlug->handle, "pcmPlug->handle");
+ AFB_ApiNotice(source->api, "AlsaCreateMulti: %s done\n", pcmPlug->cardid);
+ return pcmPlug;
+
+OnErrorExit:
+ AlsaDumpCtlConfig(source, "plug-multi", multiConfig, 1);
+ AFB_ApiNotice(source->api, "AlsaCreateMulti: OnErrorExit\n");
+ return NULL;
+} \ No newline at end of file