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-rw-r--r--plugins/alsa/alsa-api-backend.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-api-backend.c b/plugins/alsa/alsa-api-backend.c
new file mode 100644
index 0000000..948d30d
--- /dev/null
+++ b/plugins/alsa/alsa-api-backend.c
@@ -0,0 +1,218 @@
+/*
+ * 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;
+}
+
+PUBLIC int ProcessSndParams(CtlSourceT *source, const char* uid, json_object *paramsJ, AlsaPcmHwInfoT *params) {
+ const char *format = NULL, *access = NULL;
+
+ // some default values
+ params->rate = ALSA_DEFAULT_PCM_RATE;
+ params->channels = 2;
+ params->sampleSize = 0;
+
+ int error = wrap_json_unpack(paramsJ, "{s?i,s?i, s?s, s?s !}", "rate", &params->rate, "channels", &params->channels, "format", &format, "access", &access);
+ if (error) goto OnErrorExit;
+
+ if (!format) params->format = SND_PCM_FORMAT_S16_LE;
+ else if (!strcasecmp(format, "S16_LE")) params->format = SND_PCM_FORMAT_S16_LE;
+ else if (!strcasecmp(format, "S16_BE")) params->format = SND_PCM_FORMAT_S16_BE;
+ else if (!strcasecmp(format, "U16_LE")) params->format = SND_PCM_FORMAT_U16_LE;
+ else if (!strcasecmp(format, "U16_BE")) params->format = SND_PCM_FORMAT_U16_BE;
+ else if (!strcasecmp(format, "S32_LE")) params->format = SND_PCM_FORMAT_S32_LE;
+ else if (!strcasecmp(format, "S32_BE")) params->format = SND_PCM_FORMAT_S32_BE;
+ else if (!strcasecmp(format, "U32_LE")) params->format = SND_PCM_FORMAT_U32_LE;
+ else if (!strcasecmp(format, "U32_BE")) params->format = SND_PCM_FORMAT_U32_BE;
+ else if (!strcasecmp(format, "S24_LE")) params->format = SND_PCM_FORMAT_S24_LE;
+ else if (!strcasecmp(format, "S24_BE")) params->format = SND_PCM_FORMAT_S24_BE;
+ else if (!strcasecmp(format, "U24_LE")) params->format = SND_PCM_FORMAT_U24_LE;
+ else if (!strcasecmp(format, "U24_BE")) params->format = SND_PCM_FORMAT_U24_BE;
+ else if (!strcasecmp(format, "S8")) params->format = SND_PCM_FORMAT_S8;
+ else if (!strcasecmp(format, "U8")) params->format = SND_PCM_FORMAT_U8;
+ else if (!strcasecmp(format, "FLOAT_LE")) params->format = SND_PCM_FORMAT_FLOAT_LE;
+ else if (!strcasecmp(format, "FLOAT_BE")) params->format = SND_PCM_FORMAT_FLOAT_LE;
+ else {
+ AFB_ApiNotice(source->api, "ProcessSndParams:%s(params) unsupported format 'S16_LE|S32_L|...' format=%s", uid, format);
+ goto OnErrorExit;
+ }
+
+ if (!access) params->access = SND_PCM_ACCESS_RW_INTERLEAVED;
+ else if (!strcasecmp(access, "MMAP_INTERLEAVED")) params->access = SND_PCM_ACCESS_MMAP_INTERLEAVED;
+ else if (!strcasecmp(access, "MMAP_NONINTERLEAVED")) params->access = SND_PCM_ACCESS_MMAP_NONINTERLEAVED;
+ else if (!strcasecmp(access, "MMAP_COMPLEX")) params->access = SND_PCM_ACCESS_MMAP_COMPLEX;
+ else if (!strcasecmp(access, "RW_INTERLEAVED")) params->access = SND_PCM_ACCESS_RW_INTERLEAVED;
+ else if (!strcasecmp(access, "RW_NONINTERLEAVED")) params->access = SND_PCM_ACCESS_RW_NONINTERLEAVED;
+
+ else {
+ AFB_ApiNotice(source->api, "ProcessSndParams:%s(params) unsupported access 'RW_INTERLEAVED|MMAP_INTERLEAVED|MMAP_COMPLEX' access=%s", uid, access);
+ goto OnErrorExit;
+ }
+
+ return 0;
+
+OnErrorExit:
+ return -1;
+}
+
+STATIC int ProcessOneSndCard(CtlSourceT *source, json_object *sndcardJ, AlsaPcmInfoT *snd) {
+ json_object *sinkJ = NULL, *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;
+ }
+ } else {
+ snd->params.rate = ALSA_DEFAULT_PCM_RATE;
+ snd->params.access = SND_PCM_ACCESS_RW_INTERLEAVED;
+ snd->params.format = SND_PCM_FORMAT_S16_LE;
+ snd->params.channels = 2;
+ }
+
+ // 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
+ char dmixUid[100];
+ snprintf(dmixUid, sizeof (dmixUid), "Dmix-%s", snd->uid);
+ AlsaPcmInfoT *dmixPcm = AlsaCreateDmix(source, dmixUid, snd, 0);
+ if (!dmixPcm) {
+ AFB_ApiError(source->api, "ProcessOneSndCard: sndcard=%s fail to attach dmix plugin", snd->uid);
+ goto OnErrorExit;
+ } else {
+ 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;
+}
+
+PUBLIC int SndBackend(CtlSourceT *source, json_object *argsJ) {
+ SoftMixerHandleT *mixerHandle = (SoftMixerHandleT*) source->context;
+ int error;
+ size_t count;
+
+ assert(mixerHandle);
+
+ if (mixerHandle->backend) {
+ AFB_ApiError(source->api, "SndBackend: mixer=%s backend already declared %s", mixerHandle->uid, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+
+ switch (json_object_get_type(argsJ)) {
+ case json_type_object:
+ count = 1;
+ mixerHandle->backend = calloc(count + 1, sizeof (AlsaPcmInfoT));
+ error = ProcessOneSndCard(source, argsJ, &mixerHandle->backend[0]);
+ if (error) goto OnErrorExit;
+ break;
+ case json_type_array:
+ count = json_object_array_length(argsJ);
+ mixerHandle->backend = 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, &mixerHandle->backend[idx]);
+ if (error) goto OnErrorExit;
+ }
+ break;
+ default:
+ AFB_ApiError(source->api, "SndBackend: mixer=%s invalid argsJ= %s", mixerHandle->uid, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+
+
+ if (count == 1) {
+ // only one sound card we multi would be useless
+ mixerHandle->multiPcm = &mixerHandle->backend[0];
+
+ } else {
+
+ // instantiate an alsa multi plugin
+ mixerHandle->multiPcm = AlsaCreateMulti(source, "PcmMulti", 0);
+ if (!mixerHandle->multiPcm) goto OnErrorExit;
+
+ }
+ return 0;
+
+OnErrorExit:
+ AFB_ApiNotice(source->api, "SndBackend mixer=%s fail to process: %s", mixerHandle->uid, json_object_get_string(argsJ));
+ return -1;
+}