用Libaad2来进行AAC解码
头文件:
///
////audio_decode.h 2010-11-15 by lishen
#ifndef _AUDIODECODE_H_
#define _AUDIODECODE_H_
#include "../lib/neaacdec.h"
typedef
struct _ADecode
{
NeAACDecHandle m_hAac; // audio decode handle
int m_init;
}ADecode;
typedef
int (*audio_decode_event)(DWORD arg1,
const
char *buf,
int len);
ADecode* ADecode_Open ();
int ADecode_Close (ADecode* adecode);
int ADecode_Decode (ADecode* adecode,
const
char *buf,
int buf_len,
audio_decode_event fnt,
DWORD arg);
#endif
实现文件:
///
////audio_decode.cpp 2010-11-15 by lishen
#include "../common/common.h"
#include <windows.h>
#include <stdio.h>
#include "audio_decode.h"
#pragma comment(lib, "libfaad2.lib")
ADecode* ADecode_Open ()
{
NeAACDecHandle hAac = NeAACDecOpen();
NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(hAac);
NeAACDecSetConfiguration(hAac, conf);
ADecode* adecode = new ADecode ();
adecode->m_hAac = hAac;
adecode->m_init = 0;
return adecode;
}
int ADecode_Close (ADecode* adecode)
{
if (adecode->m_hAac != NULL)
{
NeAACDecClose(adecode->m_hAac);
}
delete adecode;
return 0;
}
int ADecode_Decode (ADecode* adecode,
const
char *buf,
int buf_len,
audio_decode_event fnt, DWORD arg)
{
int ret = 0;
NeAACDecFrameInfo hInfo;
if (adecode->m_init == 0)
{
adecode->m_init = 1;
unsigned long samplerate;
unsigned char channels;
NeAACDecInit (adecode->m_hAac, (unsigned char *) buf, buf_len, &samplerate, &channels);
}
short buf1[1024 * 4] = {0};
int buf_off = 0;
unsigned char *p = (unsigned char *) buf;
do
{
void* out = NeAACDecDecode (adecode->m_hAac, &hInfo, p, buf_len);
if ((hInfo.error == 0) && (hInfo.samples > 0))
{
p += hInfo.bytesconsumed;
buf_len -= hInfo.bytesconsumed;
// distill wave
short *p1 = buf1, *p2 = (short*) out;
for (int k = (hInfo.samples / hInfo.channels); k; k --){*p1 ++ = *p2; p2 += 2;}
//trace0 (PROG_DEBUG, "%s-%d ADecode_decode %d.", __FILE__, __LINE__, len);
// put out wave
if (fnt != 0){ret = fnt (arg, (char*) buf1, hInfo.samples);}
}
else if (hInfo.error != 0)
{
ret = -1;
break;
}
}while (buf_len > 0);
return ret;
}
///////audio_decode.h 2010-11-15 by lishen
#ifndef _AUDIODECODE_H_
#define _AUDIODECODE_H_
#include "../lib/neaacdec.h"
typedef
struct _ADecode
{ NeAACDecHandle m_hAac; // audio decode handle int m_init;}ADecode;
typedef
int (*audio_decode_event)(DWORD arg1,
const
char *buf,
int len);
ADecode* ADecode_Open ();
int ADecode_Close (ADecode* adecode);
int ADecode_Decode (ADecode* adecode,
const
char *buf,
int buf_len,
audio_decode_event fnt,
DWORD arg);
#endif
实现文件:
///////audio_decode.cpp 2010-11-15 by lishen
#include "../common/common.h"
#include <windows.h>
#include <stdio.h>
#include "audio_decode.h"
#pragma comment(lib, "libfaad2.lib")
ADecode* ADecode_Open ()
{ NeAACDecHandle hAac = NeAACDecOpen(); NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(hAac); NeAACDecSetConfiguration(hAac, conf); ADecode* adecode = new ADecode (); adecode->m_hAac = hAac; adecode->m_init = 0; return adecode;}
int ADecode_Close (ADecode* adecode)
{ if (adecode->m_hAac != NULL) { NeAACDecClose(adecode->m_hAac); } delete adecode; return 0;}
int ADecode_Decode (ADecode* adecode,
const
char *buf,
int buf_len,
audio_decode_event fnt, DWORD arg)
{ int ret = 0; NeAACDecFrameInfo hInfo; if (adecode->m_init == 0) { adecode->m_init = 1; unsigned long samplerate; unsigned char channels; NeAACDecInit (adecode->m_hAac, (unsigned char *) buf, buf_len, &samplerate, &channels); } short buf1[1024 * 4] = {0}; int buf_off = 0; unsigned char *p = (unsigned char *) buf; do { void* out = NeAACDecDecode (adecode->m_hAac, &hInfo, p, buf_len); if ((hInfo.error == 0) && (hInfo.samples > 0)) { p += hInfo.bytesconsumed; buf_len -= hInfo.bytesconsumed; // distill wave short *p1 = buf1, *p2 = (short*) out; for (int k = (hInfo.samples / hInfo.channels); k; k --){*p1 ++ = *p2; p2 += 2;} //trace0 (PROG_DEBUG, "%s-%d ADecode_decode %d.", __FILE__, __LINE__, len); // put out wave if (fnt != 0){ret = fnt (arg, (char*) buf1, hInfo.samples);} } else if (hInfo.error != 0) { ret = -1; break; } }while (buf_len > 0); return ret;}