/
faac.go
172 lines (140 loc) · 3.91 KB
/
faac.go
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package faac
/*
#include "faac.h"
#include <stdio.h>
// "int32_t" makes cgo crazy, "signed int" works ...
int wrappedFaacEncEncode(faacEncHandle hEncoder, signed int *inputBuffer, unsigned int samplesInput, unsigned char *outputBuffer, unsigned int bufferSize) {
return faacEncEncode(hEncoder, inputBuffer, samplesInput, outputBuffer, bufferSize);
}
#cgo LDFLAGS: -lfaac
*/
import "C"
import (
"errors"
"runtime"
"unsafe"
)
//Encoder export
type Encoder struct {
handle C.faacEncHandle
inputSamples int
maxOutputBytes int
sampleWidth int
}
/*
pConfiguration->shortctl = SHORTCTL_NORMAL;
pConfiguration->useTns=true;
*/
const (
InputFloat = int(C.FAAC_INPUT_FLOAT)
Input16bits = int(C.FAAC_INPUT_16BIT)
Input32bits = int(C.FAAC_INPUT_32BIT)
shortctl = int(C.SHORTCTL_NORMAL)
Main = int(C.MAIN)
)
//Open func
func Open(sampleRate int, channelCount int) *Encoder {
var inputSamples C.ulong
var maxOutputBytes C.ulong
//inputSamples = 960
handle := C.faacEncOpen(
C.ulong(sampleRate),
C.uint(channelCount),
&inputSamples,
&maxOutputBytes)
encoder := &Encoder{
handle: handle,
inputSamples: int(inputSamples),
maxOutputBytes: int(maxOutputBytes),
}
runtime.SetFinalizer(encoder, finalizeEncoder)
return encoder
}
type EncoderConfiguration struct {
// QuantizerQuality int
BitRate int
InputFormat int
OutputFormat int
ObjectType int
UseLFE bool
UseTNS bool
}
func (encoder *Encoder) Configuration() *EncoderConfiguration {
config := C.faacEncGetCurrentConfiguration(encoder.handle)
return &EncoderConfiguration{
// QuantizerQuality: int(config.quantqual),
BitRate: int(config.bitRate),
InputFormat: int(config.inputFormat),
OutputFormat: int(config.outputFormat),
ObjectType: int(config.aacObjectType),
UseLFE: (config.useLfe == 1),
UseTNS: (config.useTns == 1),
}
}
func (encoder *Encoder) SetConfiguration(configuration *EncoderConfiguration) error {
config := C.faacEncGetCurrentConfiguration(encoder.handle)
// config.quantqual = C.ulong(configuration.QuantizerQuality)
config.bitRate = C.ulong(configuration.BitRate)
config.inputFormat = C.uint(configuration.InputFormat)
config.outputFormat = C.uint(configuration.OutputFormat)
config.aacObjectType = C.uint(configuration.ObjectType)
if configuration.UseLFE {
config.useLfe = 1
} else {
config.useLfe = 0
}
if configuration.UseTNS {
config.useTns = 1
} else {
config.useTns = 0
}
config.shortctl = C.int(C.SHORTCTL_NORMAL)
//config.bandWidth = C.uint(10)
//config.quantqual = C.ulong(64000)
switch {
case configuration.InputFormat == Input16bits:
encoder.sampleWidth = 2
case configuration.InputFormat == Input32bits:
encoder.sampleWidth = 4
}
if C.faacEncSetConfiguration(encoder.handle, config) == 0 {
return errors.New("Can't configure Faac encoder")
}
return nil
}
func (encoder *Encoder) InputSamples() int {
return encoder.inputSamples
}
func (encoder *Encoder) MaxOutputBytes() int {
return encoder.maxOutputBytes
}
//OutputBuffer method
func (encoder *Encoder) OutputBuffer() []byte {
return make([]byte, encoder.maxOutputBytes)
}
func (encoder *Encoder) EncodeFloats(samples []float32, output []byte) int {
encodedByteCount := C.wrappedFaacEncEncode(encoder.handle,
(*C.int)(unsafe.Pointer(&samples[0])),
C.uint(len(samples)),
(*C.uchar)(unsafe.Pointer(&output[0])),
C.uint(len(output)))
return int(encodedByteCount)
}
func (encoder *Encoder) EncodeBytes(samples []byte, output []byte) int {
// log.Println(len())
encodedByteCount := C.wrappedFaacEncEncode(encoder.handle,
(*C.int)(unsafe.Pointer(&samples[0])),
C.uint(len(samples)/encoder.sampleWidth),
(*C.uchar)(unsafe.Pointer(&output[0])),
C.uint(len(output)))
return int(encodedByteCount)
}
func (encoder *Encoder) Close() {
if encoder.handle != nil {
C.faacEncClose(encoder.handle)
encoder.handle = nil
}
}
func finalizeEncoder(encoder *Encoder) {
encoder.Close()
}