lameHelper.h

#pragma once
#ifndef _LAME_HELPER_H_
#define _LAME_HELPER_H_

#include <windows.h>
#include "lame.h"

#define LH_STARTED WM_USER+1
#define LH_COMPUTED WM_USER+2
#define LH_DONE WM_USER+3
#define LH_ERROR WM_USER+4

#define MAX_THREAD_COUNT 5

enum encode_mode_e
{
	EM_ABR,
	EM_CBR,
	EM_VBR
};

enum encode_channel_e
{
	EC_MONO,
	EC_STEREO
};

enum bitrate_e
{
	BR_8kbps = 8,
	BR_16kbps = 16,
	BR_24kbps = 24,
	BR_32kbps = 32,
	BR_40kbps = 40,
	BR_48kbps = 48,
	BR_56kbps = 56,
	BR_64kbps = 64,
	BR_80kbps = 80,
	BR_96kbps = 96,
	BR_112kbps = 112,
	BR_128kbps = 128,
	BR_144kbps = 144,
	BR_160kbps = 160,
	BR_192kbps = 192,
	BR_224kbps = 224,
	BR_256kbps = 256,
	BR_320kbps = 320
};

enum samplerate_e
{
	SR_8khz = 8000,
	SR_11khz = 11025,
	SR_12khz = 12000,
	SR_16khz = 16000,
	SR_22khz = 22050,
	SR_24khz = 24000,
	SR_32khz = 32000,
	SR_44khz = 44100,
	SR_48khz = 48000
};

struct settings_t
{
	char* title;
	char* artist;
	char* album;
	char* comment;
	char* year;
	char* track;
	char* genre;
	char* albumart;

	encode_channel_e channels;
	bitrate_e abr_bitrate;
	bitrate_e cbr_bitrate;
	int quality;
	encode_mode_e enc_mode;
	samplerate_e resample_frequency;
	samplerate_e in_samplerate;

	//The constructor; used to set default values
	settings_t();
};

class CLameHelper; //lameHelper prototype, needed because of struct StaticParam_t

//Use to hold parameters for the thread function
struct StaticParam_t
{
	char* pcm;
	char* mp3;
	settings_t settings;
	WNDPROC callback_proc;
	CLameHelper* lhObj;
};


class CLameHelper
{
public :
	static const int PCM_SIZE = 4096;
	static const int MP3_SIZE = 4096;

	HANDLE m_hThread[MAX_THREAD_COUNT];
	StaticParam_t* m_phSParam[MAX_THREAD_COUNT];

	static int Decode_s(void* pParam);
	
	void WriteWaveHeader(FILE* const, int, int, int, int);
	void Write32BitLowHigh(FILE*, int);
	void Write16BitLowHigh(FILE*, int);

	void errorHandler(char*);
	char errMsg[1000];
	long m_lWavSize;

public:
	CLameHelper();
	~CLameHelper();

	int Decode(char* szMp3_in, char* szPcm_out);
	int Decode(char* szMp3_in, char* szPcm_out, WNDPROC callback_proc);	
};

#endif