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binding.cc
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binding.cc
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// ALAC.node, © 2014 Stéphan Kochen
// MIT-licensed. (See the included LICENSE file.)
#include <v8.h>
#include <node.h>
#include <nan.h>
#include <node_buffer.h>
#include <ALACBitUtilities.h>
#include <ALACEncoder.h>
#include <ALACDecoder.h>
using namespace v8;
using namespace node;
namespace alac {
static Nan::Persistent<String> frames_per_packet_symbol;
static Nan::Persistent<String> sample_rate_symbol;
static Nan::Persistent<String> channels_symbol;
static Nan::Persistent<String> bit_depth_symbol;
static Nan::Persistent<String> cookie_symbol;
// XXX: Stolen from convert-utility.
enum
{
kTestFormatFlag_16BitSourceData = 1,
kTestFormatFlag_20BitSourceData = 2,
kTestFormatFlag_24BitSourceData = 3,
kTestFormatFlag_32BitSourceData = 4
};
void
throw_alac_error(int32_t ret)
{
// XXX: The remaining values are unused in the codec itself.
switch (ret) {
case kALAC_ParamError:
Nan::ThrowError("ALAC error: invalid parameter");
case kALAC_MemFullError:
Nan::ThrowError("ALAC error: out of memory");
default:
Nan::ThrowError("ALAC error: unknown error");
}
}
class Encoder : public Nan::ObjectWrap
{
public:
static void
Initialize(Handle<Object> target)
{
Local<FunctionTemplate> t = Nan::New<FunctionTemplate>(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
Nan::SetPrototypeMethod(t, "encode", Encode);
// XXX: Finish is a no-op, so don't bother.
Nan::Set(target, Nan::New<String>("Encoder").ToLocalChecked(), t->GetFunction());
}
virtual
~Encoder() {}
private:
Encoder() : enc_() {}
static void
New(const Nan::FunctionCallbackInfo<v8::Value>& info)
{
Nan::HandleScope scope;
Local<Object> o = Nan::To<Object>(info[0]).ToLocalChecked();
Encoder *e = new Encoder();
// Fill input format structure.
AudioFormatDescription &inf = e->inf_;
inf.mFormatID = kALACFormatLinearPCM;
inf.mFormatFlags = 0; // XXX: These are pretty much ignored.
inf.mFramesPerPacket = 1;
inf.mReserved = 0;
inf.mSampleRate = o->Get(Nan::New<String>(sample_rate_symbol))->NumberValue();
inf.mChannelsPerFrame = o->Get(Nan::New<String>(channels_symbol))->Uint32Value();
inf.mBitsPerChannel = o->Get(Nan::New<String>(bit_depth_symbol))->Uint32Value();
inf.mBytesPerPacket = inf.mBytesPerFrame = inf.mChannelsPerFrame * (inf.mBitsPerChannel >> 3);
// Fill output format structure.
AudioFormatDescription &outf = e->outf_;
outf.mFormatID = kALACFormatAppleLossless;
outf.mReserved = 0;
// XXX: Zero because it's VBR.
outf.mBytesPerPacket = 0;
outf.mBytesPerFrame = 0;
outf.mBitsPerChannel = 0;
outf.mFramesPerPacket = o->Get(Nan::New<String>(frames_per_packet_symbol))->Uint32Value();
outf.mSampleRate = o->Get(Nan::New<String>(sample_rate_symbol))->NumberValue();
outf.mChannelsPerFrame = o->Get(Nan::New<String>(channels_symbol))->Uint32Value();
switch (o->Get(Nan::New<String>(bit_depth_symbol))->Uint32Value()) {
case 20: outf.mFormatFlags = kTestFormatFlag_20BitSourceData; break;
case 24: outf.mFormatFlags = kTestFormatFlag_24BitSourceData; break;
case 32: outf.mFormatFlags = kTestFormatFlag_32BitSourceData; break;
default: outf.mFormatFlags = kTestFormatFlag_16BitSourceData; break;
}
// Init encoder.
e->enc_.SetFrameSize(e->outf_.mFramesPerPacket);
int32_t ret = e->enc_.InitializeEncoder(e->outf_);
if (ret != ALAC_noErr) {
delete e;
throw_alac_error(ret);
return;
}
// Build cookie buffer.
uint32_t cookieSize = e->enc_.GetMagicCookieSize(e->outf_.mChannelsPerFrame);
char cookie[cookieSize];
e->enc_.GetMagicCookie(cookie, &cookieSize);
// Init self.
e->Wrap(info.This());
e->handle()->Set(Nan::New<String>(cookie_symbol), Nan::CopyBuffer(cookie, cookieSize).ToLocalChecked());
info.GetReturnValue().Set(info.This());
}
static void
Encode(const Nan::FunctionCallbackInfo<v8::Value>& info)
{
Nan::HandleScope scope;
Encoder *e = Nan::ObjectWrap::Unwrap<Encoder>(info.This());
unsigned char *in = (unsigned char *) Buffer::Data(info[0]);
unsigned char *out = (unsigned char *) Buffer::Data(info[1]);
int32_t size = (int32_t) Buffer::Length(info[0]);
int32_t ret = e->enc_.Encode(e->inf_, e->outf_, in, out, &size);
if (ret != ALAC_noErr) {
throw_alac_error(ret);
return;
}
info.GetReturnValue().Set(Nan::New<Uint32>(size));
}
private:
ALACEncoder enc_;
AudioFormatDescription inf_;
AudioFormatDescription outf_;
};
class Decoder : public Nan::ObjectWrap
{
public:
static void
Initialize(Handle<Object> target)
{
Local<FunctionTemplate> t = Nan::New<FunctionTemplate>(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
Nan::SetPrototypeMethod(t, "decode", Decode);
Nan::Set(target, Nan::New<String>("Decoder").ToLocalChecked(), t->GetFunction());
}
virtual
~Decoder() {}
private:
Decoder() : dec_() {}
static void
New(const Nan::FunctionCallbackInfo<v8::Value>& info)
{
Nan::HandleScope scope;
Handle<Object> o = Handle<Object>::Cast(info[0]);
Handle<Value> v;
Decoder *d = new Decoder();
// Fill parameters.
v = o->Get(Nan::New<String>(cookie_symbol));
d->channels_= o->Get(Nan::New<String>(channels_symbol))->Uint32Value();
d->frames_ = o->Get(Nan::New<String>(frames_per_packet_symbol))->Uint32Value();
// Init decoder.
int32_t ret = d->dec_.Init(Buffer::Data(v), Buffer::Length(v));
if (ret != ALAC_noErr) {
delete d;
throw_alac_error(ret);
return;
}
// Init self.
d->Wrap(info.This());
info.GetReturnValue().Set(info.This());
}
static void
Decode(const Nan::FunctionCallbackInfo<v8::Value>& info)
{
Nan::HandleScope scope;
Decoder *d = Nan::ObjectWrap::Unwrap<Decoder>(info.This());
BitBuffer in;
BitBufferInit(&in, (uint8_t *) Buffer::Data(info[0]), Buffer::Length(info[0]));
uint8_t *out = (uint8_t *) Buffer::Data(info[1]);
uint32_t numFrames;
int32_t ret = d->dec_.Decode(&in, out, d->frames_, d->channels_, &numFrames);
if (ret != ALAC_noErr) {
throw_alac_error(ret);
return;
}
info.GetReturnValue().Set(Nan::New<Uint32>(numFrames));
}
private:
ALACDecoder dec_;
uint32_t channels_;
uint32_t frames_;
};
static void
Initialize(Handle<Object> target)
{
Nan::HandleScope scope;
frames_per_packet_symbol.Reset(Nan::New<String>("framesPerPacket").ToLocalChecked());
sample_rate_symbol.Reset(Nan::New<String>("sampleRate").ToLocalChecked());
channels_symbol.Reset(Nan::New<String>("channels").ToLocalChecked());
bit_depth_symbol.Reset(Nan::New<String>("bitDepth").ToLocalChecked());
cookie_symbol.Reset(Nan::New<String>("cookie").ToLocalChecked());
NODE_DEFINE_CONSTANT(target, kALACDefaultFramesPerPacket);
NODE_DEFINE_CONSTANT(target, kALACMaxEscapeHeaderBytes);
Encoder::Initialize(target);
Decoder::Initialize(target);
}
} // namespace alac
extern "C" void
init(Handle<Object> target)
{
alac::Initialize(target);
}
NODE_MODULE(binding, init)