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audio_mixer.c
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audio_mixer.c
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#include "audio_mixer.h"
#define AUPROC_CAPI_IMPLEMENT_GET_CAPI 1
#include "auproc_capi.h"
#define SENDER_CAPI_IMPLEMENT_GET_CAPI 1
#include "sender_capi.h"
/* ============================================================================================ */
static const char* const AUDIO_MIXER_CLASS_NAME = "auproc.audio_mixer";
static const char* ERROR_INVALID_AUDIO_MIXER = "invalid auproc.audio_mixer";
/* ============================================================================================ */
typedef struct InputConnection InputConnection;
typedef struct AudioMixerUserData AudioMixerUserData;
struct InputConnection
{
auproc_connector* connector;
const auproc_audiometh* methods;
float factor;
};
struct AudioMixerUserData
{
const char* className;
auproc_processor* processor;
auproc_con_reg* connectorRegs;
InputConnection* inpConnections;
int inpConnectionsCount;
auproc_connector* outConnector;
const auproc_audiometh* outMethods;
bool closed;
bool activated;
const auproc_capi* auprocCapi;
auproc_engine* auprocEngine;
const sender_capi* senderCapi;
sender_object* sender;
sender_reader* senderReader;
};
/* ============================================================================================ */
static void setupAudioMixerMeta(lua_State* L);
static int pushAudioMixerMeta(lua_State* L)
{
if (luaL_newmetatable(L, AUDIO_MIXER_CLASS_NAME)) {
setupAudioMixerMeta(L);
}
return 1;
}
/* ============================================================================================ */
static AudioMixerUserData* checkAudioMixerUdata(lua_State* L, int arg)
{
AudioMixerUserData* udata = luaL_checkudata(L, arg, AUDIO_MIXER_CLASS_NAME);
if (udata->auprocCapi) {
udata->auprocCapi->checkEngineIsNotClosed(L, udata->auprocEngine);
}
if (udata->closed) {
luaL_error(L, ERROR_INVALID_AUDIO_MIXER);
return NULL;
}
return udata;
}
/* ============================================================================================ */
static int processCallback(uint32_t nframes, void* processorData)
{
AudioMixerUserData* udata = (AudioMixerUserData*) processorData;
InputConnection* inputs = udata->inpConnections;
int n = udata->inpConnectionsCount;
if (udata->sender)
{
const sender_capi* senderCapi = udata->senderCapi;
sender_reader* reader = udata->senderReader;
nextMsg:;
int rc = senderCapi->nextMessageFromSender(udata->sender, reader,
true /* nonblock */, 0 /* timeout */,
NULL /* errorHandler */, NULL /* errorHandlerData */);
if (rc == 0) {
sender_capi_value senderValue;
nextValues:
senderCapi->nextValueFromReader(reader, &senderValue);
if (senderValue.type != SENDER_CAPI_TYPE_NONE) {
bool hasValue = false;
int inputIndex;
if (senderValue.type == SENDER_CAPI_TYPE_INTEGER) {
hasValue = true;
inputIndex = senderValue.intVal;
} else if (senderValue.type == SENDER_CAPI_TYPE_NUMBER) {
hasValue = true;
inputIndex = (int)senderValue.numVal;
}
if (hasValue) {
senderCapi->nextValueFromReader(reader, &senderValue);
hasValue = false;
lua_Number factor;
if (senderValue.type == SENDER_CAPI_TYPE_INTEGER) {
hasValue = true;
factor = senderValue.intVal;
} else if (senderValue.type == SENDER_CAPI_TYPE_NUMBER) {
hasValue = true;
factor = senderValue.numVal;
}
if (hasValue) {
inputs[inputIndex - 1].factor = factor;
goto nextValues;
}
}
}
goto nextMsg;
}
}
{
const auproc_capi* capi = udata->auprocCapi;
const auproc_audiometh* outMethods = udata->outMethods;
float* outBuf = outMethods->getAudioBuffer(udata->outConnector, nframes);
float* outputEnd = outBuf + nframes;
{
float factor = inputs[0].factor;
float* firstIn = inputs[0].methods->getAudioBuffer(inputs[0].connector, nframes);
float* output = outBuf;
while (output < outputEnd) {
*(output++) = *(firstIn++) * factor;
}
}
for (int i = 1; i < n; ++i) {
float factor = inputs[i].factor;
float* input = inputs[i].methods->getAudioBuffer(inputs[i].connector, nframes);
float* output = outBuf;
while (output < outputEnd) {
*(output++) += *(input++) * factor;
}
}
}
return 0;
}
/* ============================================================================================ */
static void engineClosedCallback(void* processorData)
{
AudioMixerUserData* udata = (AudioMixerUserData*) processorData;
udata->closed = true;
udata->activated = false;
}
static void engineReleasedCallback(void* processorData)
{
AudioMixerUserData* udata = (AudioMixerUserData*) processorData;
udata->closed = true;
udata->activated = false;
udata->auprocCapi = NULL;
udata->auprocEngine = NULL;
}
/* ============================================================================================ */
static int AudioMixer_new(lua_State* L)
{
const int firstArg = 1;
const int lastArg = lua_gettop(L);
AudioMixerUserData* udata = lua_newuserdata(L, sizeof(AudioMixerUserData));
memset(udata, 0, sizeof(AudioMixerUserData));
udata->className = AUDIO_MIXER_CLASS_NAME;
pushAudioMixerMeta(L); /* -> udata, meta */
lua_setmetatable(L, -2); /* -> udata */
int versionError = 0;
const auproc_capi* capi = auproc_get_capi(L, firstArg, &versionError);
auproc_engine* engine = NULL;
if (capi) {
engine = capi->getEngine(L, firstArg, NULL);
}
if (!capi || !engine) {
if (versionError) {
return luaL_argerror(L, firstArg, "auproc capi version mismatch");
} else {
return luaL_argerror(L, firstArg, "expected connector object");
}
}
const int firstConArg = (capi->getObjectType(L, firstArg) == AUPROC_TENGINE) ? firstArg + 1 : firstArg;
int lastConArg = lastArg;
for (int i = firstConArg; i <= lastArg; ++i) {
if (!capi->getConnectorType(L, i)) {
lastConArg = i - 1;
break;
}
}
const int outConArg = lastConArg;
const int senderArg = lastConArg + 1;
if (firstConArg + 1 > lastConArg) {
luaL_argerror(L, firstConArg, "expected at least two auproc connector objects");
}
if (senderArg <= lastArg)
{
int errReason = 0;
const sender_capi* senderCapi = sender_get_capi(L, senderArg, &errReason);
sender_object* sender = senderCapi ? senderCapi->toSender(L, senderArg) : NULL;
if (!senderCapi || !sender) {
if (errReason == 1) {
return luaL_argerror(L, senderArg, "sender capi version mismatch");
} else {
return luaL_argerror(L, senderArg, "expected sender capi object");
}
}
udata->senderCapi = senderCapi;
udata->sender = sender;
senderCapi->retainSender(sender);
udata->senderReader = senderCapi->newReader(16 * 1024, 1);
if (!udata->senderReader) {
return luaL_error(L, "out of memory");
}
}
const char* processorName = lua_pushfstring(L, "%s: %p", AUDIO_MIXER_CLASS_NAME, udata); /* -> udata, name */
const int conCount = lastConArg - firstConArg + 1;
auproc_con_reg* conRegs = malloc(sizeof(auproc_con_reg) * conCount);
InputConnection* inpConnections = malloc(sizeof(InputConnection) * (conCount - 1));
if (!conRegs || !inpConnections) {
if (conRegs) free(conRegs);
if (inpConnections) free(inpConnections);
return luaL_error(L, "out of memory");
}
memset(conRegs, 0, sizeof(auproc_con_reg) * conCount);
memset(inpConnections, 0, sizeof(InputConnection) * (conCount - 1));
udata->connectorRegs = conRegs;
udata->inpConnections = inpConnections;
udata->inpConnectionsCount = conCount - 1;
const auproc_con_reg inConReg = {AUPROC_AUDIO, AUPROC_IN, NULL};
const auproc_con_reg outConReg = {AUPROC_AUDIO, AUPROC_OUT, NULL};
for (int i = 0; i < conCount - 1; ++i) {
conRegs[i] = inConReg;
}
conRegs[conCount - 1] = outConReg;
auproc_con_reg_err regError = {0};
auproc_processor* proc = capi->registerProcessor(L, firstConArg, conCount, engine, processorName, udata,
processCallback, NULL, engineClosedCallback, engineReleasedCallback,
conRegs, ®Error);
lua_pop(L, 1); /* -> udata */
if (!proc)
{
if (regError.conIndex >= 0)
{
int errArg = firstConArg + regError.conIndex;
if (regError.errorType == AUPROC_REG_ERR_CONNCTOR_INVALID)
{
return luaL_argerror(L, errArg, "invalid connector object");
}
if ( regError.errorType == AUPROC_REG_ERR_ENGINE_MISMATCH)
{
const char* msg = lua_pushfstring(L, "connector belongs to other %s",
capi->engine_category_name);
return luaL_argerror(L, errArg, msg);
}
if (regError.errorType == AUPROC_REG_ERR_ARG_INVALID
|| regError.errorType == AUPROC_REG_ERR_WRONG_CONNECTOR_TYPE)
{
if (errArg < lastConArg) {
return luaL_argerror(L, errArg, "expected AUDIO IN connector");
}
if (errArg == lastConArg) {
return luaL_argerror(L, errArg, "expected AUDIO OUT connector");
}
}
if (regError.errorType == AUPROC_REG_ERR_WRONG_DIRECTION)
{
if (errArg < lastConArg) {
return luaL_argerror(L, errArg, "given connector is not readable");
}
if (errArg == lastConArg) {
return luaL_argerror(L, errArg, "given connector is not writable");
}
}
}
return luaL_error(L, "cannot register processor (err=%d)", regError.errorType);
}
udata->processor = proc;
udata->activated = false;
udata->auprocCapi = capi;
udata->auprocEngine = engine;
for (int i = 0; i < conCount - 1; ++i) {
udata->inpConnections[i].connector = conRegs[i].connector;
udata->inpConnections[i].factor = 1.0;
udata->inpConnections[i].methods = conRegs[i].audioMethods;
}
udata->outConnector = conRegs[conCount - 1].connector;
udata->outMethods = conRegs[conCount - 1].audioMethods;
return 1;
}
/* ============================================================================================ */
static int AudioMixer_release(lua_State* L)
{
AudioMixerUserData* udata = luaL_checkudata(L, 1, AUDIO_MIXER_CLASS_NAME);
udata->closed = true;
udata->activated = false;
if (udata->auprocCapi) {
udata->auprocCapi->unregisterProcessor(L, udata->auprocEngine, udata->processor);
udata->processor = NULL;
udata->auprocCapi = NULL;
udata->auprocEngine = NULL;
}
if (udata->sender) {
if (udata->senderReader) {
udata->senderCapi->freeReader(udata->senderReader);
udata->senderReader = NULL;
}
udata->senderCapi->releaseSender(udata->sender);
udata->sender = NULL;
udata->senderCapi = NULL;
}
if (udata->connectorRegs) {
free(udata->connectorRegs);
udata->connectorRegs = NULL;
}
if (udata->inpConnections) {
free(udata->inpConnections);
udata->inpConnections = NULL;
udata->inpConnectionsCount = 0;
}
return 0;
}
/* ============================================================================================ */
static int AudioMixer_toString(lua_State* L)
{
AudioMixerUserData* udata = luaL_checkudata(L, 1, AUDIO_MIXER_CLASS_NAME);
lua_pushfstring(L, "%s: %p", AUDIO_MIXER_CLASS_NAME, udata);
return 1;
}
/* ============================================================================================ */
static int AudioMixer_activate(lua_State* L)
{
AudioMixerUserData* udata = checkAudioMixerUdata(L, 1);
if (!udata->activated) {
udata->auprocCapi->activateProcessor(L, udata->auprocEngine, udata->processor);
udata->activated = true;
}
return 0;
}
/* ============================================================================================ */
static int AudioMixer_deactivate(lua_State* L)
{
AudioMixerUserData* udata = checkAudioMixerUdata(L, 1);
if (udata->activated) {
udata->auprocCapi->deactivateProcessor(L, udata->auprocEngine, udata->processor);
udata->activated = false;
}
return 0;
}
/* ============================================================================================ */
static const luaL_Reg AudioMixerMethods[] =
{
{ "activate", AudioMixer_activate },
{ "deactivate", AudioMixer_deactivate },
{ "close", AudioMixer_release },
{ NULL, NULL } /* sentinel */
};
static const luaL_Reg AudioMixerMetaMethods[] =
{
{ "__tostring", AudioMixer_toString },
{ "__gc", AudioMixer_release },
{ NULL, NULL } /* sentinel */
};
static const luaL_Reg ModuleFunctions[] =
{
{ "new_audio_mixer", AudioMixer_new },
{ NULL, NULL } /* sentinel */
};
/* ============================================================================================ */
static void setupAudioMixerMeta(lua_State* L)
{ /* -> meta */
lua_pushstring(L, AUDIO_MIXER_CLASS_NAME); /* -> meta, className */
lua_setfield(L, -2, "__metatable"); /* -> meta */
luaL_setfuncs(L, AudioMixerMetaMethods, 0); /* -> meta */
lua_newtable(L); /* -> meta, AudioMixerClass */
luaL_setfuncs(L, AudioMixerMethods, 0); /* -> meta, AudioMixerClass */
lua_setfield (L, -2, "__index"); /* -> meta */
}
/* ============================================================================================ */
int auproc_audio_mixer_init_module(lua_State* L, int module)
{
if (luaL_newmetatable(L, AUDIO_MIXER_CLASS_NAME)) {
setupAudioMixerMeta(L);
}
lua_pop(L, 1);
lua_pushvalue(L, module);
luaL_setfuncs(L, ModuleFunctions, 0);
lua_pop(L, 1);
return 0;
}
/* ============================================================================================ */