转载自:http://www.oschina.net/code/snippet_196503_6933
头文件:
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///////////////////////////////////////////////////////////////////////
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////audio_decode.h 2010-11-15 by lishen
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#ifndef _AUDIODECODE_H_
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#define _AUDIODECODE_H_
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#include "../lib/neaacdec.h"
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typedef struct _ADecode
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{
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NeAACDecHandle m_hAac; // audio decode handle
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int m_init;
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}ADecode;
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typedef int (*audio_decode_event)(DWORD arg1, const char *buf, int len);
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ADecode* ADecode_Open ();
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int ADecode_Close (ADecode* adecode);
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int ADecode_Decode (ADecode* adecode,
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const char *buf,
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int buf_len,
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audio_decode_event fnt,
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DWORD arg);
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#endif
实现文件:
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///////////////////////////////////////////////////////////////////////
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////audio_decode.cpp 2010-11-15 by lishen
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#include "../common/common.h"
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#include <windows.h>
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#include <stdio.h>
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#include "audio_decode.h"
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#pragma comment(lib, "libfaad2.lib")
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ADecode* ADecode_Open ()
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{
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NeAACDecHandle hAac = NeAACDecOpen();
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NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(hAac);
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NeAACDecSetConfiguration(hAac, conf);
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ADecode* adecode = new ADecode ();
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adecode->m_hAac = hAac;
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adecode->m_init = 0;
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return adecode;
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}
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int ADecode_Close (ADecode* adecode)
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{
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if (adecode->m_hAac != NULL)
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{
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NeAACDecClose(adecode->m_hAac);
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}
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delete adecode;
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return 0;
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}
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int ADecode_Decode (ADecode* adecode, const char *buf, int buf_len,
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audio_decode_event fnt, DWORD arg)
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{
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int ret = 0;
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NeAACDecFrameInfo hInfo;
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if (adecode->m_init == 0)
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{
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adecode->m_init = 1;
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unsigned long samplerate;
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unsigned char channels;
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NeAACDecInit (adecode->m_hAac, (unsigned char *) buf, buf_len, &samplerate, &channels);
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}
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short buf1[1024 * 4] = {0};
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int buf_off = 0;
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unsigned char *p = (unsigned char *) buf;
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do
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{
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void* out = NeAACDecDecode (adecode->m_hAac, &hInfo, p, buf_len);
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if ((hInfo.error == 0) && (hInfo.samples > 0))
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{
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p += hInfo.bytesconsumed;
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buf_len -= hInfo.bytesconsumed;
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// distill wave
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short *p1 = buf1, *p2 = (short*) out;
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for (int k = (hInfo.samples / hInfo.channels); k; k --){*p1 ++ = *p2; p2 += 2;}
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//trace0 (PROG_DEBUG, "%s-%d ADecode_decode %d.", __FILE__, __LINE__, len);
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// put out wave
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if (fnt != 0){ret = fnt (arg, (char*) buf1, hInfo.samples);}
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}
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else if (hInfo.error != 0)
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{
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ret = -1;
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break;
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}
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}while (buf_len > 0);
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return ret;
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}
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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;}