diff options
Diffstat (limited to 'plugins/alsa/alsa-api-loop.c')
| -rw-r--r-- | plugins/alsa/alsa-api-loop.c | 205 |
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; +}
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