diff options
Diffstat (limited to 'plugins/alsa/alsa-api-backend.c')
| -rw-r--r-- | plugins/alsa/alsa-api-backend.c | 218 |
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", ¶ms->rate, "channels", ¶ms->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", ¶msJ + ); + 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; +} |