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/*
* 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>
// Set stream volume control in %
#define VOL_CONTROL_MAX 100
#define VOL_CONTROL_MIN 0
#define VOL_CONTROL_STEP 1
// Fulup need to be cleanup with new controller version
extern Lua2cWrapperT Lua2cWrap;
STATIC int ProcessOneStream(CtlSourceT *source, json_object *streamJ, AlsaSndStreamT *stream) {
int error;
json_object *paramsJ = NULL;
// Make sure default runs
stream->volume = ALSA_DEFAULT_PCM_VOLUME;
stream->mute = 0;
error = wrap_json_unpack(streamJ, "{ss,ss,s?i,s?b,s?o !}", "uid", &stream->uid, "zone", &stream->zone, "volume", &stream->volume
, "mute", stream->mute, "params", ¶msJ);
if (error) {
AFB_ApiNotice(source->api, "ProcessOneStream missing 'uid|zone|volume|rate|mute|params' stream=%s", json_object_get_string(streamJ));
goto OnErrorExit;
}
if (paramsJ) error = ProcessSndParams(source, stream->uid, paramsJ, &stream->params);
if (error) {
AFB_ApiError(source->api, "ProcessOneSndCard: sndcard=%s invalid params=%s", stream->uid, json_object_get_string(paramsJ));
goto OnErrorExit;
} else {
stream->params.rate = ALSA_DEFAULT_PCM_RATE;
stream->params.rate = ALSA_DEFAULT_PCM_RATE;
stream->params.access = SND_PCM_ACCESS_RW_INTERLEAVED;
stream->params.format = SND_PCM_FORMAT_S16_LE;
stream->params.channels = 2;
stream->params.sampleSize = 0;
}
// make sure remain valid even when json object is removed
stream->uid = strdup(stream->uid);
stream->zone = strdup(stream->zone);
return 0;
OnErrorExit:
return -1;
}
CTLP_LUA2C(snd_streams, source, argsJ, responseJ) {
AlsaSndStreamT *sndStream;
int error;
long value;
size_t count;
// assert static/global softmixer handle get requited info
AlsaSndLoopT *ctlLoop = Softmixer->loopCtl;
if (!ctlLoop) {
AFB_ApiError(source->api, "L2C:sndstreams: No Loop found [should register snd_loop first]");
goto OnErrorExit;
}
switch (json_object_get_type(argsJ)) {
case json_type_object:
count = 1;
sndStream = calloc(count + 1, sizeof (AlsaSndStreamT));
error = ProcessOneStream(source, argsJ, &sndStream[0]);
if (error) {
AFB_ApiError(source->api, "L2C:sndstreams: invalid stream= %s", json_object_get_string(argsJ));
goto OnErrorExit;
}
break;
case json_type_array:
count = json_object_array_length(argsJ);
sndStream = calloc(count + 1, sizeof (AlsaSndStreamT));
for (int idx = 0; idx < count; idx++) {
json_object *sndStreamJ = json_object_array_get_idx(argsJ, idx);
error = ProcessOneStream(source, sndStreamJ, &sndStream[idx]);
if (error) {
AFB_ApiError(source->api, "sndstreams: invalid stream= %s", json_object_get_string(sndStreamJ));
goto OnErrorExit;
}
}
break;
default:
AFB_ApiError(source->api, "L2C:sndstreams: invalid argsJ= %s", json_object_get_string(argsJ));
goto OnErrorExit;
}
// return stream data to application as a json array
*responseJ = json_object_new_array();
for (int idx = 0; sndStream[idx].uid != NULL; idx++) {
json_object *streamJ, *paramsJ;
// Search for a free loop capture device
AFB_ApiNotice(source->api, "L2C:sndstreams stream=%s Start", (char*) sndStream[idx].uid);
ctlLoop->scount--;
if (ctlLoop->scount < 0) {
AFB_ApiError(source->api, "L2C:sndstreams no more subdev avaliable in loopback=%s", ctlLoop->uid);
goto OnErrorExit;
}
// Retrieve subdev loop device and open corresponding pcm
AlsaPcmInfoT *playbackDev = &ctlLoop->subdevs[ctlLoop->scount];
// capture use the same card/subdev as playback with a different device
playbackDev->device = ctlLoop->capture;
AlsaPcmInfoT *captureDev = AlsaByPathOpenPcm(source, playbackDev, SND_PCM_STREAM_CAPTURE);
if (!captureDev) goto OnErrorExit;
// configure with default loopback subdev params
error = AlsaPcmConf(source, captureDev, &playbackDev->params);
if (error) goto OnErrorExit;
// Register capture PCM for active/pause event
if (captureDev->numid) {
error = AlsaCtlRegister(source, captureDev, captureDev->numid);
if (error) goto OnErrorExit;
}
// Try to create/setup volume control.
snd_ctl_t* ctlDev = AlsaCrlFromPcm(source, captureDev->handle);
if (!ctlDev) {
AFB_ApiError(source->api, "AlsaCtlRegister [pcm=%s] fail attache sndcard", captureDev->cardid);
goto OnErrorExit;
}
// create mute control and register it as pause/resume ctl)
char runName[ALSA_CARDID_MAX_LEN];
snprintf(runName, sizeof (runName), "run-%s", sndStream[idx].uid);
// create a single boolean value control for pause/resume
int runNumid = AlsaCtlCreateControl(source, ctlDev, playbackDev, runName, 1, 0, 1, 1, !sndStream[idx].mute);
if (runNumid <= 0) goto OnErrorExit;
// register mute/unmute as a pause/resume control
error = AlsaCtlRegister(source, captureDev, runNumid);
if (error) goto OnErrorExit;
// create stream and delay pcm openning until vol control is created
char volName[ALSA_CARDID_MAX_LEN];
snprintf(volName, sizeof (volName), "vol-%s", sndStream[idx].uid);
AlsaPcmInfoT *streamPcm = AlsaCreateStream(source, &sndStream[idx], captureDev, volName, VOL_CONTROL_MAX, 0);
if (!streamPcm) {
AFB_ApiError(source->api, "L2C:sndstreams:%s(pcm) fail to create stream", sndStream[idx].uid);
goto OnErrorExit;
}
// create volume control before softvol pcm is opened
int volNumid = AlsaCtlCreateControl(source, ctlDev, playbackDev, volName, streamPcm->params.channels, VOL_CONTROL_MIN, VOL_CONTROL_MAX, VOL_CONTROL_STEP, sndStream[idx].volume);
if (volNumid <= 0) goto OnErrorExit;
// **** Fulup (would need some help to get automatic rate converter to work).
// // add a rate converter plugin to match stream params config
// char rateName[ALSA_CARDID_MAX_LEN];
// snprintf(rateName, sizeof (rateName), "rate-%s", sndStream[idx].uid);
// AlsaPcmInfoT *ratePcm= AlsaCreateRate(source, rateName, streamPcm, 1);
// if (!ratePcm) {
// AFB_ApiError(source->api, "L2C:sndstreams:%s(pcm) fail to create rate converter", sndStream[idx].uid);
// goto OnErrorExit;
// }
// everything is not ready to open capture pcm
error = snd_pcm_open(&streamPcm->handle, sndStream[idx].uid, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
if (error) {
AFB_ApiError(source->api, "L2C:sndstreams:%s(pcm) fail to open capture", sndStream[idx].uid);
goto OnErrorExit;
}
// capture stream inherit channel from targeted zone
captureDev->ccount = streamPcm->ccount;
streamPcm->params.channels = streamPcm->ccount;
// start stream pcm copy (at this both capture & sink pcm should be open)
error = AlsaPcmCopy(source, captureDev, streamPcm, &streamPcm->params);
if (error) goto OnErrorExit;
// retrieve active/pause control and set PCM status accordingly
error = AlsaCtlNumidGetLong(source, ctlDev, captureDev->numid, &value);
if (error) goto OnErrorExit;
// toggle pause/resume (should be done after pcm_start)
if ((error = snd_pcm_pause(captureDev->handle, !value)) < 0) {
AFB_ApiError(source->api, "L2C:sndstreams [capture=%s] fail to pause error=%s", captureDev->cardid, snd_strerror(error));
goto OnErrorExit;
}
// prepare response for application
playbackDev->device = ctlLoop->playback;
error = AlsaByPathDevid(source, playbackDev);
error += wrap_json_pack(¶msJ, "{si si si si}", "rate", streamPcm->params.rate, "channels", streamPcm->params.channels, "format", streamPcm->params.format, "access", streamPcm->params.access);
error += wrap_json_pack(&streamJ, "{ss ss si si so}", "uid", streamPcm->uid, "alsa", playbackDev->cardid, "volid", volNumid, "runid", runNumid, "params", paramsJ);
error += json_object_array_add(*responseJ, streamJ);
if (error) {
AFB_ApiError(source->api, "L2C:sndstreams:%s(stream) fail to prepare response", captureDev->cardid);
goto OnErrorExit;
}
snd_ctl_close(ctlDev);
// Debug Alsa Config
//AlsaDumpElemConfig (source, "\n\nAlsa_Config\n------------\n", "pcm");
//AlsaDumpPcmInfo(source, "\n\nPcm_config\n-----------\n", streamPcm->handle);
AFB_ApiNotice(source->api, "L2C:sndstreams:%s(stream) OK reponse=%s\n", streamPcm->uid, json_object_get_string(streamJ));
}
return 0;
OnErrorExit:
return -1;
}
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