xvid2.h

对MPEG4视频码流的解压

	void *bitstream;     /* [in]     bitstream (read from)*/
	int length;          /* [in]     bitstream length */
	xvid_image_t output; /* [in]     output image (written to) */
} xvid_dec_frame_t;


/* XVID_DEC_DECODE param2 :: optional */
typedef struct
{
	int version;

	int type;                   /* [out] output data type */
	union {
		struct { /* type>0 {XVID_TYPE_IVOP,XVID_TYPE_PVOP,XVID_TYPE_BVOP,XVID_TYPE_SVOP} */
			int general;        /* [out] flags */
			int time_base;      /* [out] time base */
			int time_increment; /* [out] time increment */

			/* XXX: external deblocking stuff */
			int * qscale;	    /* [out] pointer to quantizer table */
			int qscale_stride;  /* [out] quantizer scale stride */

		} vop;
		struct {	/* XVID_TYPE_VOL */
			int general;        /* [out] flags */
			int width;          /* [out] width */
			int height;         /* [out] height */
			int par;            /* [out] pixel aspect ratio (refer to XVID_PAR_xxx above) */
			int par_width;      /* [out] aspect ratio width  [1..255] */
			int par_height;     /* [out] aspect ratio height [1..255] */
		} vol;
	} data;
} xvid_dec_stats_t;

#define XVID_ZONE_QUANT  (1<<0)
#define XVID_ZONE_WEIGHT (1<<1)

typedef struct
{
	int frame;
	int mode;
	int increment;
	int base;
} xvid_enc_zone_t;


/*----------------------------------------------------------------------------
 * xvid_enc_stats_t structure
 *
 * Used in:
 *  - xvid_plg_data_t structure
 *  - optional parameter in xvid_encore() function
 *
 * .coding_type = XVID_TYPE_NOTHING if the stats are not given
 *--------------------------------------------------------------------------*/

typedef struct {
	int version;

	/* encoding parameters */
	int type;      /* [out] coding type */
	int quant;     /* [out] frame quantizer */
	int vol_flags; /* [out] vol flags (see above) */
	int vop_flags; /* [out] vop flags (see above) */

	/* bitrate */
	int length;    /* [out] frame length */

	int hlength;   /* [out] header length (bytes) */
	int kblks;     /* [out] number of blocks compressed as Intra */
	int mblks;     /* [out] number of blocks compressed as Inter */
	int ublks;     /* [out] number of blocks marked as not_coded */

	int sse_y;     /* [out] Y plane's sse */
	int sse_u;     /* [out] U plane's sse */
	int sse_v;     /* [out] V plane's sse */
} xvid_enc_stats_t;

/*****************************************************************************
  xvid plugin system -- internals

  xvidcore will call XVID_PLG_INFO and XVID_PLG_CREATE during XVID_ENC_CREATE
  before encoding each frame xvidcore will call XVID_PLG_BEFORE
  after encoding each frame xvidcore will call XVID_PLG_AFTER
  xvidcore will call XVID_PLG_DESTROY during XVID_ENC_DESTROY
 ****************************************************************************/


#define XVID_PLG_CREATE  (1<<0)
#define XVID_PLG_DESTROY (1<<1)
#define XVID_PLG_INFO    (1<<2)
#define XVID_PLG_BEFORE  (1<<3)
#define XVID_PLG_FRAME   (1<<4)
#define XVID_PLG_AFTER   (1<<5)

/* xvid_plg_info_t.flags */
#define XVID_REQORIGINAL (1<<0) /* plugin requires a copy of the original (uncompressed) image */
#define XVID_REQPSNR     (1<<1) /* plugin requires psnr between the uncompressed and compressed image*/
#define XVID_REQDQUANTS  (1<<2) /* plugin requires access to the dquant table */


typedef struct
{
	int version;
	int flags;   /* [in:opt] plugin flags */
} xvid_plg_info_t;


typedef struct
{
	int version;

	int num_zones;           /* [out] */
	xvid_enc_zone_t * zones; /* [out] */

	int width;               /* [out] */
	int height;              /* [out] */
	int mb_width;            /* [out] */
	int mb_height;           /* [out] */
	int fincr;               /* [out] */
	int fbase;               /* [out] */

	void * param;            /* [out] */
} xvid_plg_create_t;


typedef struct
{
	int version;

	int num_frames; /* [out] total frame encoded */
} xvid_plg_destroy_t;

typedef struct
{
	int version;

	xvid_enc_zone_t * zone; /* [out] current zone */

	int width;              /* [out] */
	int height;             /* [out] */
	int mb_width;           /* [out] */
	int mb_height;          /* [out] */
	int fincr;              /* [out] */
	int fbase;              /* [out] */

	int min_quant[3];       /* [out] */
	int max_quant[3];       /* [out] */

	xvid_image_t reference; /* [out] -> [out] */
	xvid_image_t current;   /* [out] -> [in,out] */
	xvid_image_t original;  /* [out] after: points the original (uncompressed) copy of the current frame */
	int frame_num;          /* [out] frame number */

	int type;               /* [in,out] */
	int quant;              /* [in,out] */

	int * dquant;           /* [in,out]	pointer to diff quantizer table */
	int dquant_stride;      /* [in,out]	diff quantizer stride */

	int vop_flags;          /* [in,out] */
	int vol_flags;          /* [in,out] */
	int motion_flags;       /* [in,out] */

/* Deprecated, use the stats field instead.
 * Will disapear before 1.0 */
	int length;             /* [out] after: length of encoded frame */
	int kblks;              /* [out] number of blocks compressed as Intra */
	int mblks;              /* [out] number of blocks compressed as Inter */
	int ublks;              /* [out] number of blocks marked not_coded */
	int sse_y;              /* [out] Y plane's sse */
	int sse_u;              /* [out] U plane's sse */
	int sse_v;              /* [out] V plane's sse */
/* End of duplicated data, kept only for binary compatibility */

	int bquant_ratio;       /* [in] */
	int bquant_offset;      /* [in] */

	xvid_enc_stats_t stats; /* [out] frame statistics */
} xvid_plg_data_t;

/*****************************************************************************
  xvid plugin system -- external

  the application passes xvid an array of "xvid_plugin_t" at XVID_ENC_CREATE. the array
  indicates the plugin function pointer and plugin-specific data.
  xvidcore handles the rest. example:

  xvid_enc_create_t create;
  xvid_enc_plugin_t plugins[2];

  plugins[0].func = xvid_psnr_func;
  plugins[0].param = NULL;
  plugins[1].func = xvid_cbr_func;
  plugins[1].param = &cbr_data;

  create.num_plugins = 2;
  create.plugins = plugins;

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

typedef int (xvid_plugin_func)(void * handle, int opt, void * param1, void * param2);

typedef struct
{
	xvid_plugin_func * func;
	void * param;
} xvid_enc_plugin_t;


extern xvid_plugin_func xvid_plugin_single;   /* single-pass rate control */
extern xvid_plugin_func xvid_plugin_2pass1;   /* two-pass rate control: first pass */
extern xvid_plugin_func xvid_plugin_2pass2;   /* two-pass rate control: second pass */

extern xvid_plugin_func xvid_plugin_lumimasking;  /* lumimasking */

extern xvid_plugin_func xvid_plugin_psnr;	/* write psnr values to stdout */
extern xvid_plugin_func xvid_plugin_dump;	/* dump before and after yuvpgms */


/* single pass rate control
 * CBR and Constant quantizer modes */
typedef struct
{
	int version;

	int bitrate;               /* [in] bits per second */
	int reaction_delay_factor; /* [in] */
	int averaging_period;      /* [in] */
	int buffer;                /* [in] */
} xvid_plugin_single_t;


typedef struct {
	int version;

	char * filename;
} xvid_plugin_2pass1_t;


#define XVID_PAYBACK_BIAS 0 /* payback with bias */
#define XVID_PAYBACK_PROP 1 /* payback proportionally */

typedef struct {
	int version;

	int bitrate;                  /* [in] bits per second */
	char * filename;              /* [in] first pass stats filename */

	int keyframe_boost;           /* [in] keyframe boost percentage: [0..100] */
	int curve_compression_high;   /* [in] percentage of compression performed on the high part of the curve (above average) */
	int curve_compression_low;    /* [in] percentage of compression performed on the low  part of the curve (below average) */
	int overflow_control_strength;/* [in] Payback delay expressed in number of frames */
	int max_overflow_improvement; /* [in] percentage of allowed range for a frame that gets bigger because of overflow bonus */
	int max_overflow_degradation; /* [in] percentage of allowed range for a frame that gets smaller because of overflow penalty */

	int kfreduction;              /* [in] maximum bitrate reduction applied to an iframe under the kfthreshold distance limit */
	int kfthreshold;              /* [in] if an iframe is closer to the next iframe than this distance, a quantity of bits
								   *      is substracted from its bit allocation. The reduction is computed as multiples of