mp4vosd.h

基于GM8180的OSD源代码.从SDK包中挑出来的,是很不错的资料.

#ifndef _MP4VOSD_H_
#define _MP4VOSD_H_

#ifdef LINUX
	#include "portab.h"
#else
	#include "portab.h"
#endif

	// avaiable format, start
    #define OSD_FMT_YUV	    0
    #define OSD_FMT_CbYCrY	1
    
    #ifdef LINUX      
	  // define MPEG4 osd output format, select from the following avaiable format
	  #ifdef OUTPUT_OSD_FORMAT_YUV
	    #define OSD_IMG_FORMAT	OSD_FMT_YUV
	  #elif defined(OUTPUT_OSD_FORMAT_CbYCrY)
	    #define OSD_IMG_FORMAT	OSD_FMT_CbYCrY
	  #endif
	#else
	  // define MPEG4 osd output format, select from the following avaiable format for non-OS
	  #define OSD_IMG_FORMAT OSD_FMT_YUV
      //#define OSD_IMG_FORMAT OSD_FMT_CbYCrY
	#endif
	// avaiable format, end
    
    #define 		    FMPEG4_IOCTL_OSD_INIT  	        0x4190
    #define 		    FMPEG4_IOCTL_OSD_ALPHABLEND	    0x4191

/*****************************************************************************
 * MPEG4 OSD Parameter structures
 ****************************************************************************/
	typedef struct
	{
	    uint32_t  source_width;     /**< To specify the overlay image width in pels.
	                                 *   The maximum overlay image width specified by user
	                                 *   can't exceed 1024.
	                                 */
        uint32_t  source_height;    /**< To specify the overlay image height in pels.*/
        uint8_t * source_base_phy;  /**< To specify the Y component's starting address of overlay image.
                                     *    - For YUV 420    : this address must be a multiple of 16 pixels.
                                     *    - For CbYCrY 422 : this address must be a multiple of  8 pixels.
                                     */
        uint8_t * source_base_u_phy;/**< To specify the U component's starting address of overlay image.
                                     *   This variable is only used for YUV 420.
                                     *    - For YUV 420    : this address must be a multiple of 16 pixels.
                                     */
        uint8_t * source_base_v_phy;/**< To specify the V component's starting address of overlay image.
                                     *   This variable is only used for YUV 420.
                                     *    - For YUV 420    : this address must be a multiple of 16 pixels.
                                     */
		uint32_t output_width;     /**< To specify the background image width in pels.*/
		uint32_t output_height;     /**< To specify the background image height in pels.*/
		uint8_t * output_base_phy;  /**< To specify the Y component's starting address of background image.
                                     *    - For YUV 420    : this address must be a multiple of 16 pixels.
                                     *    - For CbYCrY 422 : this address must be a multiple of  8 pixels.
                                     */
		uint8_t * output_base_u_phy;/**< To specify the U component's starting address of background image.
                                     *   This variable is only used for YUV 420.
                                     *    - For YUV 420    : this address must be a multiple of 16 pixels.
                                     */
		uint8_t * output_base_v_phy;/**< To specify the V component's starting address of background image.
                                     *   This variable is only used for YUV 420.
                                     *    - For YUV 420    : this address must be a multiple of 16 pixels.
                                     */
		uint32_t osd_x;             /**< 
                                     *   User can use this parameter to specify the upper-left x coordinate
                                     *   of overlay image within background image.
                                     *    - For YUV 420    : the x coordinate must be a multiple of 16 pixels.
                                     *    - For CbYCrY 422 : the x coordinate must be a multiple of  4 pixels.
                                     */
		uint32_t osd_y;             /**< 
                                     *   User can use this parameter to specify the upper-left y coordinate
                                     *   of overlay image within background frame.
                                     */                                    
		uint32_t alpha;             /**< 
                                     *   User can use this parameter to specify the alpha value of overlay
                                     *   image. The alpha value is between 0 to 255. It will make overlay 
                                     *   image opaque if alpha value is equal to 255. And the overlay image
                                     *   will be transparent if alpha value is equal to 0.
                                     */
		uint32_t u32API_version;
		uint32_t u32VirtualBaseAddr;
	} FMP4_OSD_PARAM;

	#ifdef MP4VOSD_GLOBALS
		#define MP4VOSD_EXT
	#else
		#define MP4VOSD_EXT extern
	#endif

	MP4VOSD_EXT void
	Mp4VOsd_Init(FMP4_OSD_PARAM * ptParam);

	MP4VOSD_EXT void
	Mp4VOsd_AlphaBlend(FMP4_OSD_PARAM * ptParam);

#ifdef __cplusplus
}
#endif

#endif