codectypes.h

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/*************************************************************************/

/************************************************************************* 
	CODECTYPES.h


	Author	gaowei
	date	2004.12.7
	
Note:
	
History:
	
 *************************************************************************/


#ifndef _CODECTYPES_H_
#define _CODECTYPES_H_

enum PixelFormat {
    PIX_FMT_YUV420P,   ///< Planar YUV 4:2:0 (1 Cr & Cb sample per 2x2 Y samples)
    PIX_FMT_YUV422,    
    PIX_FMT_RGB24,     ///< Packed pixel, 3 bytes per pixel, RGBRGB...
    PIX_FMT_BGR24,     ///< Packed pixel, 3 bytes per pixel, BGRBGR...
    PIX_FMT_YUV422P,   ///< Planar YUV 4:2:2 (1 Cr & Cb sample per 2x1 Y samples)
    PIX_FMT_YUV444P,   ///< Planar YUV 4:4:4 (1 Cr & Cb sample per 1x1 Y samples)
    PIX_FMT_RGBA32,    ///< Packed pixel, 4 bytes per pixel, BGRABGRA..., stored in cpu endianness
    PIX_FMT_YUV410P,   ///< Planar YUV 4:1:0 (1 Cr & Cb sample per 4x4 Y samples)
    PIX_FMT_YUV411P,   ///< Planar YUV 4:1:1 (1 Cr & Cb sample per 4x1 Y samples)
    PIX_FMT_RGB565,    ///< always stored in cpu endianness 
    PIX_FMT_RGB555,    ///< always stored in cpu endianness, most significant bit to 1 
    PIX_FMT_GRAY8,
    PIX_FMT_MONOWHITE, ///< 0 is white 
    PIX_FMT_MONOBLACK, ///< 0 is black 
    PIX_FMT_PAL8,      ///< 8 bit with RGBA palette 
    PIX_FMT_YUVJ420P,  ///< Planar YUV 4:2:0 full scale (jpeg)
    PIX_FMT_YUVJ422P,  ///< Planar YUV 4:2:2 full scale (jpeg)
    PIX_FMT_YUVJ444P,  ///< Planar YUV 4:4:4 full scale (jpeg)
    PIX_FMT_XVMC_MPEG2_MC,///< XVideo Motion Acceleration via common packet passing(xvmc_render.h)
    PIX_FMT_XVMC_MPEG2_IDCT,
    PIX_FMT_NB
};

enum CodecType {
    CODEC_TYPE_UNKNOWN = -1,
	CODEC_TYPE_VIDEO,
	CODEC_TYPE_AUDIO,
	CODEC_TYPE_DATA
};
/************************************************************************* 

	以下是通用便解码器模型,与播放器接口。

 *************************************************************************/
typedef struct CodecContext{

	DWORD		magic_code;		//例如 "AAC!" -> ('!'<<24) + ('C'<<16) + ('A'<<8) + 'A').
							//由编解码器自己填写,进行参数合法性判断

	void		*priv_data;		//一般用来存放编解码器句柄

/********************* common part*********************************/    
    enum		CodecType codec_type;	/* i.e  CODEC_TYPE_AUDIO */
    INT32		codec_id;				/* i.e  CODEC_ID_AAC */	

    void		*extradata;		//mpeg4: global headers (they can be in the bitstream or here)
    INT32		extradata_size; //size of extradata 
	INT32		bit_rate;		//the average bitrate.

	INT32		dts;			//decompression time stamp in AV_TIME_BASE units (or
								//pts_den units in muxers or demuxers)
	INT32		pts;			//presentation time stamp in AV_TIME_BASE units (or
								//pts_den units in muxers or demuxers)
	INT32		duration;		//presentation duration (0 if not available)
	INT32		totle_frame_count;

	INT32		time_base_den;	//for rescale 
	INT32		time_base_num;	//for rescale 

	INT32		frame_index;
	//UInt8*		outbuf;
	//INT32			one_frame_size;
/********************* audio only *********************************/ 
	
	INT32		bits_per_sample;
    INT32		sample_rate;	//采样率 
    INT32		channels;		//通道
    INT32		sample_fmt;		//采样格式 
	
/********************* video only *********************************/

	//Frame rate
    INT32		frame_rate;				//frames per sec multiplied by frame_rate_base.
	INT32		frame_rate_base;		//(frame_rate_f) = frame_rate * 1.0 / frame_rate_base

    INT32		width, height;			//width / height.
	INT32		csp;					// color space, output format
	void*		dec_stats;
/********************* encode only *********************************/
	INT32		rate_emu;				//编码使用	Frame rate emulation.
	INT32		delay;					
	INT32		qmin;		// maximum quantizer.	通过控制量化来控制码率!
	INT32		qmax;		// minimum quantizer.
	INT32		max_qdiff;  // maximum quantizer difference etween frames.
	INT32		max_b_frames;			// maximum number of b frames between non b frames.
									// note: the output will be delayed by max_b_frames+1 relative to the input
	INT32		frame_bits;				// number of bits used for the previously encoded frame.
	INT32		luma_elim_threshold;	//luma single coeff elimination threshold.
	INT32		chroma_elim_threshold;	//chroma single coeff elimination threshold.
	INT32		has_b_frames;
	INT32		mpeg_quant;
    float		qcompress;  ///< amount of qscale change between easy & hard scenes (0.0-1.0)
    float		qblur;      ///< amount of qscale smoothing over time (0.0-1.0) 
	float		b_quant_factor;			// qscale factor between ip and b frames.
	float		b_quant_offset;			//qscale offset between ip and b frames.

}CodecContext;

/************************************************************************* 

	通用解码器接口函数集

 *************************************************************************/

typedef struct CodecInterfaceType {
	CHAR*		name;
    enum		CodecType codec_type;	/* i.e  CODEC_TYPE_AUDIO */
    INT32		codec_id;		/* i.e  CODEC_ID_AAC */	
    INT32		priv_data_size;
/********************* 必须实现部分 *********************************/
    INT32		(*init)  (CodecContext *Data);
    INT32		(*close) (CodecContext *Data);

/********************* 可选实现部分 *********************************/
	
    INT32		(*decode)(CodecContext *pData, void *pDecData, INT32 *pcbDecDataSize,
						UINT8 *pInbuf, INT32* pcbInbufSize, INT32 skip); 

    INT32		(*encode)(CodecContext *pData, void **ppEncdata, INT32 *pcbEncDataSize,
						UINT8 *pInbuf, INT32* pcbInbufSize);

    void		(*flush)(CodecContext *Data);
	struct		CodecInterfaceType *next;
} CodecInterfaceType;

#endif //_CODECTYPES_H_