amrplugin.cpp

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#include <windows.h>
#include "stdafx.h"
//#include "AMRPlugin.h"
//#include "interf_enc.h"
//#include "sp_enc.h"
// #include "interf_rom.h"

#define CODEC_ID_AMR      0x1234
// #define OUTFRAMES         16
#define FRAMMAXSIZ        32


static INT32 read_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };

typedef struct AMREnc_stru 
{
	INT32 bytesLeft;
	INT32 outOfData;                  //readBuf 是否不足一帧的数据
	INT32 eofReached;
	INT32 nFrames;
	UINT8 *readBuf;
	UINT8 *readPtr;
	UINT8 *outBuf;
	INT32 outBufSize;
	INT32 BytesFilled;
	UINT16 framerate;                 //播放器的播放帧率(一个FRAMES_FILLED相当于播放器的一帧)
	AMR_Encode_State *encInterface;
	INT32 usedBytes;
	INT32 start_tag;
} AMREnc_Stru;

static AMREnc_Stru* AMR_EncStru_Init()
{
	AMREnc_Stru *AMREncStru;

	AMREncStru = ( AMREnc_Stru * )new AMREnc_Stru;
	if ( AMREncStru == NULL )
	{
		return NULL;
	}

	AMREncStru->bytesLeft = 0;
	AMREncStru->outOfData = 0;
    AMREncStru->eofReached = 0;
	AMREncStru->nFrames = 0;
	AMREncStru->readBuf = NULL;
	AMREncStru->readPtr = NULL;
	AMREncStru->outBuf = NULL;
	AMREncStru->outBufSize = 0;
	AMREncStru->framerate = 50;
	AMREncStru->usedBytes = 0;
	AMREncStru->BytesFilled = 0;
	AMREncStru->start_tag = 1;
	
	AMREncStru->encInterface = (AMR_Encode_State*)Encoder_Interface_init(0);
	if ( AMREncStru->encInterface == NULL )
	{
		delete AMREncStru;
		AMREncStru = NULL;
		return NULL;
	}
	
//	AMREncStru->outBufSize = SPCH_BUF_SIZE * OUTFRAMES;
//	AMREncStru->outBuf = (UINT8 *)malloc( AMREncStru->outBufSize );
//	if ( AMREncStru->outBuf == NULL )
//	{
//		Encoder_Interface_exit(AMREncStru->encInterface);
//		AMREncStru->encInterface = NULL;
//		delete AMREncStru;
//		AMREncStru = NULL;
//	}
	return AMREncStru;
}

static void AMR_EncStru_Clos(AMREnc_Stru* AMREncStru)
{
	if ( AMREncStru->encInterface )
	{
		Encoder_Interface_exit(AMREncStru->encInterface);
	}
	if ( AMREncStru->outBuf )
	{
		free(AMREncStru->outBuf);
		AMREncStru->outBuf = NULL;
	}
	delete AMREncStru;
	AMREncStru = NULL;
	return;
}

static INT32 AMR_EncStru_Enc( AMREnc_Stru *AMREncStru )
{
	INT32 nRead;
	INT32 BytesCounter;
	
// 	enum Mode dec_mode;
	AMR_Encode_State *encInterface = NULL;
	
	UINT8 *inbuf = NULL;
	UINT8 outbuf[FRAMMAXSIZ];
	
	if ( AMREncStru == NULL )
	{
		return -1;
	}
	
	nRead = SPCH_BUF_SIZE;
	AMREncStru->usedBytes = 0;
	encInterface = AMREncStru->encInterface;
		
	do 
	{ 
		if ( AMREncStru->bytesLeft < 0 )
		{
			return -2;
		}
		else if ( 0 == AMREncStru->bytesLeft )
		{
			AMREncStru->outOfData = 1;
			memset(AMREncStru->outBuf + AMREncStru->BytesFilled, 0, AMREncStru->outBufSize - AMREncStru->BytesFilled);
			break;
		}
		
		inbuf = AMREncStru->readPtr;
		if ( nRead > AMREncStru->bytesLeft ) 
		{
			AMREncStru->outOfData = 1;
			memset(AMREncStru->outBuf + AMREncStru->BytesFilled, 0, AMREncStru->outBufSize - AMREncStru->BytesFilled);
			break;
		}
		
		BytesCounter = Encoder_Interface_Encode(encInterface, ENCMODE, (INT16*)inbuf, outbuf, 0);
		
		AMREncStru->readPtr += nRead;
		AMREncStru->bytesLeft -= nRead;
		
		memcpy(AMREncStru->outBuf + AMREncStru->BytesFilled, outbuf, BytesCounter);
		
		AMREncStru->nFrames++;
		AMREncStru->BytesFilled += BytesCounter;
		
//		if ( AMREncStru->BytesFilled == OUTFRAMES * SPCH_BUF_SIZE )
//		{
//			AMREncStru->usedBytes = AMREncStru->readPtr - AMREncStru->readBuf;
//			return 1;
//		}		
	} while( !AMREncStru->outOfData );
	
	AMREncStru->usedBytes = AMREncStru->readPtr - AMREncStru->readBuf;
	return 2;
}

static INT32 amr_enc_init(CodecContext *Data)
{
	AMREnc_Stru* AMREncStru;

	memset(Data, 0, sizeof( CodecContext ));
	Data->bits_per_sample = 16;
	Data->channels = 1;
	Data->codec_id = CODEC_ID_AMR;
	Data->codec_type = CODEC_TYPE_AUDIO;
	Data->sample_fmt = 0x01;
	Data->sample_rate = 8000;
	Data->magic_code = (('!'<<24) | ('R'<<16) | ('M'<<8) | 'A');
	AMREncStru = AMR_EncStru_Init();
	if ( NULL == AMREncStru )
	{
		return -1;
	}
	Data->priv_data = AMREncStru;
	return 0;
}

static INT32 amr_enc_close(CodecContext *Data)
{
	AMREnc_Stru* AMREncStru;

	AMREncStru = (AMREnc_Stru*)Data->priv_data;
	if ( AMREncStru )
	{
		AMR_EncStru_Clos(AMREncStru);
	}
	Data->priv_data = NULL;
	return 0;
}

static INT32 amr_enc_encode(CodecContext *Data, void** outdata, INT32* outdata_size, UINT8* inbuf, INT32* inbuf_size)
{
	INT32 iJudg;
	AMREnc_Stru* AMREncStru;
	UINT8* pTemp;

	if (NULL != *outdata) 
	{
		free(*outdata);
		*outdata = NULL;
	}
	
	AMREncStru = ( AMREnc_Stru* )Data->priv_data;
	if ( NULL == AMREncStru )
	{
		return -1;
	}
	pTemp = (UINT8 *)malloc(*inbuf_size + AMREncStru->bytesLeft);
	if ( NULL == pTemp )
	{
		return -1;
	}
	memcpy(pTemp, AMREncStru->readPtr, AMREncStru->bytesLeft);
	memcpy(pTemp + AMREncStru->bytesLeft, inbuf, *inbuf_size);
	AMREncStru->readBuf = pTemp;
	AMREncStru->readPtr = AMREncStru->readBuf;
	AMREncStru->bytesLeft += *inbuf_size;
	AMREncStru->BytesFilled = 0;
	AMREncStru->outOfData = 0;
	AMREncStru->outBufSize = ((AMREncStru->bytesLeft) / SPCH_BUF_SIZE + 1) * FRAMMAXSIZ;   //根据inbufsize决定最大outbufsize
	AMREncStru->outBuf = (UINT8 *)malloc( AMREncStru->outBufSize );
	if ( AMREncStru->outBuf == NULL )
	{
		return -1;
	}

	iJudg = AMR_EncStru_Enc(AMREncStru);
	if ( iJudg < 0 )
	{
		return -2;
	}
	*outdata = AMREncStru->outBuf;
//	memcpy(outdata, AMREncStru->outBuf, AMREncStru->BytesFilled);
	*outdata_size = AMREncStru->BytesFilled;

	return AMREncStru->usedBytes;
}

static CodecInterfaceType amr_codec = 
{
	( CHAR* )"AMR",
	CODEC_TYPE_AUDIO,
	CODEC_ID_AMR,
	sizeof( AMREnc_Stru ),
	amr_enc_init,
	amr_enc_close,
	NULL,
	amr_enc_encode,
	NULL,
	NULL,
};

CodecInterfaceType* Get_AMR_EncInterface(void)
{
	CodecInterfaceType* pInterface;
	pInterface = (CodecInterfaceType*)malloc(sizeof(CodecInterfaceType));
	if (NULL == pInterface)
	{
		return NULL;
	}
	memcpy(pInterface, &amr_codec, sizeof(CodecInterfaceType));
	return pInterface;
}