diff options
Diffstat (limited to 'plugins/alsa/alsa-capture.c')
| -rw-r--r-- | plugins/alsa/alsa-capture.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-capture.c b/plugins/alsa/alsa-capture.c new file mode 100644 index 0000000..992f731 --- /dev/null +++ b/plugins/alsa/alsa-capture.c @@ -0,0 +1,80 @@ +/* + * 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" + +PUBLIC snd_pcm_t* AlsaCreateCapture(CtlSourceT *source, const char* sndDevPath, unsigned int deviceIdx, unsigned int subpcmNamex, unsigned int channelCount) { + char pcmName[32]; + int error; + snd_pcm_t *pcmHandle; + snd_pcm_hw_params_t *pcmParams; + + AFB_ApiNotice(source->api, "AlsaCreateCapture: start "); + + // get card info from /dev/snd/xxx + snd_ctl_card_info_t *cardInfo = AlsaByPathInfo(source, sndDevPath); + + if (!cardInfo) { + AFB_ApiError(source->api,"AlsaCreateCapture: fail to find sndcard by path= %s", sndDevPath); + goto OnErrorExit; + } + + // extract useful info from cardInfo handle + int cardIdx = snd_ctl_card_info_get_card(cardInfo); + const char *cardName = snd_ctl_card_info_get_name(cardInfo); + + + // build a valid name and open sndcard + snprintf(pcmName, sizeof (pcmName), "hw:%i,%i,%i", cardIdx, deviceIdx, subpcmNamex); + error= snd_pcm_open(&pcmHandle, pcmName, SND_PCM_STREAM_CAPTURE, SND_PCM_ASYNC); + if (error) { + AFB_ApiError(source->api,"AlsaCreateCapture: fail openpcm (hw:%d -> %s pcmNamex=%i subpcmNamex=%d): %s" + , cardIdx, cardName, deviceIdx, subpcmNamex, snd_strerror(error)); + goto OnErrorExit; + } + + // set default to param object + snd_pcm_hw_params_alloca(&pcmParams); + snd_pcm_hw_params_any(pcmHandle, pcmParams); + + + error= snd_pcm_hw_params_set_channels (pcmHandle, pcmParams, channelCount); + if (error) { + AFB_ApiError(source->api,"lsaCreateCapture: fail set channel count (hw:%d -> %s pcmNamex=%i subpcmNamex=%d channelCount=%d): %s" + , cardIdx, cardName, deviceIdx, subpcmNamex, channelCount, snd_strerror(error)); + goto OnErrorExit; + } + + // push selected params to PCM + error= snd_pcm_hw_params(pcmHandle, pcmParams); + if (error) { + AFB_ApiError(source->api,"lsaCreateCapture: fail pushing params (hw:%d -> %s pcmNamex=%i subpcmNamex=%d): %s" + , cardIdx, cardName, deviceIdx, subpcmNamex, snd_strerror(error)); + goto OnErrorExit; + } + + AFB_ApiNotice(source->api, "AlsaCreateCapture: done"); + free (cardInfo); + return NULL; + +OnErrorExit: + AFB_ApiNotice(source->api, "AlsaCreateCapture: OnErrorExit"); + return NULL; +}
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