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Copy pathFAACEncoder.cpp
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164 lines (137 loc) · 5 KB
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/*
Copyright (c) 2013-2016 EasyDarwin.ORG. All rights reserved.
Github: https://github.com/EasyDarwin
WEChat: EasyDarwin
Website: http://www.easydarwin.org
*/
#include "FAACEncoder.h"
#include "condef.h"
#include "outDebug.h"
FAACEncoder::FAACEncoder(void)
:m_hfaac(NULL)
, m_pfaacinfobuffer(NULL)
, m_nfaacinfosize(0)
{
m_nSampleRate = 8000;//44100; // 采样率
m_nChannels = 1; // 声道数
m_nPCMBitSize = 16; // 单样本位数
m_nInputSamples = 2048; //最大输入样本数
m_nMaxOutputBytes = 0; //最大输出字节
}
FAACEncoder::~FAACEncoder(void)
{
if (NULL != m_hfaac)
{
/*Close FAAC engine*/
faacEncClose(m_hfaac);
SAFE_FREE_BUF(m_pfaacinfobuffer);
}
}
bool FAACEncoder::Init(InAudioInfo* info)
{
if (IsWorking())
{
return 0;
}
//TODO: config this
m_nSampleRate = info->Samplerate();/*8000*/
m_nChannels = info->Channel();/*1*/
m_nPCMBitSize = info->PCMBitSize();/*16*/
/*open FAAC engine*/
//初始化aac句柄，同时获取最大输入样本，及编码所需最小字节，参数 samplerate 为要编码的音频pcm流的采样率，channels为要编码的音频pcm流的的频道数
m_hfaac = faacEncOpen(m_nSampleRate, m_nChannels, &m_nInputSamples, &m_nMaxOutputBytes);
if (m_hfaac == NULL)
{
if (1) INFO_USE2("%s:[%d] failed to call faacEncOpen !\n", __FUNCTION__, __LINE__);
//return -1;
return false;
}
/*get current encoding configuration*/
m_pfaacconf = faacEncGetCurrentConfiguration(m_hfaac);//获取配置结构指针
//* 设置配置参数
//AAC - 使用MPEG-2 Audio Transport Stream( ADTS，参见MPEG-2 )容器，区别于使用MPEG-4容器的MP4/M4A格式，
//属于传统的AAC编码（FAAC默认的封装，但FAAC亦可输出 MPEG-4 封装的AAC）
m_pfaacconf->mpegVersion = MPEG2;//MPEG4; MPEG2
int nInputFormat = FAAC_INPUT_16BIT;
switch (info->PCMBitSize())
{
case 16:
nInputFormat = FAAC_INPUT_16BIT;
break;
case 24:
nInputFormat = FAAC_INPUT_24BIT;
break;
case 32:
nInputFormat = FAAC_INPUT_32BIT;
break;
case 40:
nInputFormat = FAAC_INPUT_FLOAT;
break;
default:
break;
}
m_pfaacconf->inputFormat = nInputFormat;
m_pfaacconf->outputFormat = 1; //输出是否包含ADTS头,/*0 - raw; 1 - ADTS*/
m_pfaacconf->useTns = 0; //时域噪音控制,大概就是消爆音#define DEFAULT_TNS 0
m_pfaacconf->aacObjectType = LOW; //LC编码,MAIN
//m_pfaacconf->useLfe = false;
//m_pfaacconf->shortctl = SHORTCTL_NORMAL;
//m_pfaacconf->bandWidth = 0 ; //频宽
//m_pfaacconf->quantqual = 100 ;
//m_pfaacconf->bitRate = 0;
/*set encoding configuretion*/
faacEncSetConfiguration(m_hfaac, m_pfaacconf);//设置配置，根据不同设置，耗时不一样
faacEncGetDecoderSpecificInfo(m_hfaac, &m_pfaacinfobuffer, &m_nfaacinfosize);
int nMaxInputBytes = m_nInputSamples * m_nPCMBitSize / 8;//计算最大输入字节,跟据最大输入样本数
if (AAC_DEBUG) INFO_USE(" faacEncEncode open, InputSamples=%d MaxOutputBytes=%d\n", m_nInputSamples, m_nMaxOutputBytes);
/*
默认配置
//(0 = Raw; 1 = ADTS)
hEncoder->config.outputFormat = 1;
PCM Sample Input Format
0 FAAC_INPUT_NULL invalid, signifies a misconfigured config
1 FAAC_INPUT_16BIT native endian 16bit
2 FAAC_INPUT_24BIT native endian 24bit in 24 bits (not implemented)
3 FAAC_INPUT_32BIT native endian 24bit in 32 bits (DEFAULT)
4 FAAC_INPUT_FLOAT 32bit floating point
hEncoder->config.inputFormat = FAAC_INPUT_32BIT;
hEncoder->config.version = FAAC_CFG_VERSION;
hEncoder->config.name = libfaacName;
hEncoder->config.copyright = libCopyright;
hEncoder->config.mpegVersion = MPEG4;
hEncoder->config.aacObjectType = LTP;
hEncoder->config.allowMidside = 1;
hEncoder->config.useLfe = 1;
hEncoder->config.useTns = 0;
hEncoder->config.bitRate = 0;
hEncoder->config.bandWidth = 0.45 * hEncoder->sampleRate;
if(hEncoder->config.bandWidth > 16000)
hEncoder->config.bandWidth = 16000;
hEncoder->config.quantqual = 100;
hEncoder->config.shortctl = SHORTCTL_NORMAL;
*/
return true;
}
int FAACEncoder::GetInfo(unsigned char* data, int bufSize)
{
if (data && m_nfaacinfosize)
{
memcpy(data, m_pfaacinfobuffer, m_nfaacinfosize);
return m_nfaacinfosize;
}
return -1;
}
int FAACEncoder::Encode(unsigned char * pbPCMData, unsigned int nPCMDataSize, unsigned char * pbAACBuffer, unsigned int nMaxOutputBytes)
{
if (!m_hfaac)
{
return 0;
}
//if(AAC_DEBUG) INFO_USE2("%s:[%d] G7xx -> PCM faacEncEncode....\n", __FUNCTION__, __LINE__);
//计算实际输入样本数:PCM数据长度/采样位数8bit 16bit/8：nInputSamples = (nPCMDataSize / (nPCMBitSize / 8));
unsigned int nInputSamples = (nPCMDataSize / (m_nPCMBitSize / 8));
//编码,判断下iBytesWritten初始编码的几帧数据会返回0，0是数据被缓冲，并不是错误
int iBytesWritten = faacEncEncode(m_hfaac, (int32_t*)pbPCMData, nInputSamples, pbAACBuffer, nMaxOutputBytes);
if (AAC_DEBUG) INFO_USE(" PCM -> AAC faacEncEncode in_len=%d out_len=%d\n", nInputSamples, iBytesWritten);
return iBytesWritten;
}