s3c6410使用MFC-API进行MPEG-4格式解码及LCD播放代码注释

http://blog.csdn.net/hxgqh/article/details/6583639

/*将MPEG-4格式的视频显示到LCD上*/
#include 
#include 
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#include 


#include "s3c_pp.h"
#include "SsbSipH264Decode.h"
#include "SsbSipMpeg4Decode.h"
#include "FrameExtractor.h"
#include "MPEG4Frames.h"
#include "LogMsg.h"
#include "performance.h"
#include "lcd.h"
#include "MfcDriver.h"
#include "FileRead.h"
#define PP_DEV_NAME "/dev/s3c-pp"
#define FB_DEV_NAME "dev/fb0"
#define INPUT_BUFFER_SIZE (204800)
#define FB0_WIDTH 480
#define FB0_HEIGHT 272
#define FB0_BPP 16
#define FB0_COLOR_SPACE RGB16
static unsigned char delimiter_mpeg4[3] = {0x00,0x00,0x01};//MPEG4解码需要用到的数组


int MPEG4_display(char in_file[20])
{
	int file_size;//保存输入文件大小
	struct stat s;//保存文件信息内容
	/*打开输入文件及获得其信息*/
	int in_fd;//输入文件的文件描述符
	int pp_fd;//post processor文件描述符
	int fb_fd;//帧缓冲文件描述符
	unsigned char* in_addr;//帧起始地址
	FRAMEX_CTX *pFrameExCtx;//帧抽取上下文
	FRAMEX_STRM_PTR file_strm;//类型FRAMEX_STRM_PTR保存文件映射到内存的首地址/结束地址/当前地址等内容。
	void *handle,*pStrmBuf;
	SSBSIP_H264_STREAM_INFO stream_info;//类型SSBSIP_H264_STREAM_INFO保存视频信息
	s3c_pp_params_t pp_param;//s3c_pp_params_t结构体类型是用来专门对pp进行配置的。在s3c_pp.h里面声明。
	int fb_size;//帧缓冲大小
	unsigned char *fb_addr;//帧缓冲地址
	s3c_win_info_t osd_info_to_driver;//显示到LCD上分屏的信息
	struct fb_fix_screeninfo lcd_info;
	unsigned int pYUVBuf[2];//保存YUV格式的内容
	int nFrameLeng = 0;	


	in_fd = open(in_file,O_RDONLY);
	if(in_fd < 0)
	{
		printf("Input file open failed.\n");
		return -1;
	}


	fstat(in_fd,&s);//将文件内容保存到strcut stat s中。
	file_size = s.st_size;//获得文件大小


	/*将输入视频流映射到内存中*/
	in_addr = (char*)mmap(0,file_size,PROT_READ,MAP_SHARED,in_fd,0);	
	if(in_addr == NULL)
	{
		printf("Input file memory mapping failed.\n");
		return -1;
	}	


	/*打开Post processor，准备好pp*/
	pp_fd = open(PP_DEV_NAME,O_RDWR);
	if(pp_fd<0)
	{
		printf("Post processor open error.\n");
		return -1;
	}
	


	/*准备好LCD*/
	fb_fd = open(FB_DEV_NAME,O_RDWR|O_NDELAY);//LCD frame buffer open。打开LCD的帧缓冲
	if(fb_fd<0)
	{
		printf("LCD frame buffer open error.\n");
		return -1;
	}


	/*抽取视频内容*/
	/*步骤一：帧抽取初始化*/
	pFrameExCtx = FrameExtractorInit(FRAMEX_IN_TYPE_MEM,delimiter_mpeg4,sizeof(delimiter_mpeg4),1);
	file_strm.p_start = file_strm.p_cur = in_addr;
	file_strm.p_end = (unsigned char*)(in_addr+file_size);		
	FrameExtractorFirst(pFrameExCtx,&file_strm);//抽取第一帧


	/*步骤二：创建handle*/
	handle = SsbSipMPEG4DecodeInit();
	if(handle == NULL)
	{
		printf("MPEG4 decode init failed.\n");
		return -1;
	}	


	/*步骤三：获得输入缓冲*/
	pStrmBuf = SsbSipMPEG4DecodeGetInBuf(handle,nFrameLeng);
	if(pStrmBuf == NULL)
	{
		printf("SsbSipMPEG4DecodeGetInBuf Failed.\n");
		SsbSipMPEG4DecodeDeInit(handle);
		return -1;
	}	


	/*步骤四：配置好视频流的抽取*/
	nFrameLeng = ExtractConfigStreamMpeg4(pFrameExCtx,&file_strm,pStrmBuf,INPUT_BUFFER_SIZE,NULL);


	/*步骤五：视频解码验证*/
	if(SsbSipMPEG4DecodeExe(handle,nFrameLeng)!= SSBSIP_MPEG4_DEC_RET_OK)
	{
		printf("MPEG-4 Decoder Configuration Failed.\n");
		return -1;
	}


	/*步骤六：获得视频流信息*/
	SsbSipMPEG4DecodeGetConfig(handle,MPEG4_DEC_GETCONF_STREAMINFO,&stream_info);
	
	/*步骤七：配置pp，控制pp运行*/
	memset(&pp_param,0,sizeof(s3c_pp_params_t));
	pp_param.src_full_width = stream_info.buf_width;
	pp_param.src_full_height = stream_info.buf_height;
	pp_param.src_start_x = 0;
	pp_param.src_start_y = 0;
	pp_param.src_width = pp_param.src_full_width;
	pp_param.src_height = pp_param.src_full_height;
	pp_param.src_color_space = YC420;
	pp_param.dst_full_width = FB0_WIDTH;
	pp_param.dst_full_height = FB0_HEIGHT;
	pp_param.dst_start_x = 0;
	pp_param.dst_start_y = 0;
	pp_param.dst_width = pp_param.dst_full_width;
	pp_param.dst_height = pp_param.dst_full_height;
	pp_param.dst_color_space = FB0_COLOR_SPACE;
	pp_param.out_path = DMA_ONESHOT;	
	ioctl(pp_fd,S3C_PP_SET_PARAMS,&pp_param);


	/*步骤八：获得LCD帧缓冲的地址*/
	fb_size = pp_param.dst_full_width*pp_param.dst_full_height*2;//RGB565。红色R用5位表示，绿色G用6位表示，蓝色B用5为表示，总共16位共2字节，故乘以2


	fb_addr = (char*)mmap(0,fb_size,PROT_READ|PROT_WRITE,MAP_SHARED,fb_fd,0);//获得帧缓冲的首地址
	if(fb_addr == NULL)
	{
		printf("LCD frame buffer mmap failed.\n");
		return -1;
	}


	osd_info_to_driver.Bpp = FB0_BPP;
	osd_info_to_driver.LeftTop_x = 0;
	osd_info_to_driver.LeftTop_y = 0;
	osd_info_to_driver.Width = FB0_WIDTH;
	osd_info_to_driver.Height = FB0_HEIGHT;


	//设置OSD信息(OSD=On Screen Display)
	if(ioctl(fb_fd,SET_OSD_INFO,&osd_info_to_driver))
	{
		printf("Some problem with the ioctl SET_OSD_INFO.\n");	
		return -1;
	}
	ioctl(fb_fd,SET_OSD_START);
	printf("\nMy MPEG-4 Display Info\n");
	printf("Input filename : %s\n",in_file);
	while(1)
	{
		/*步骤九：对MPEG4解码*/
		if(SsbSipMPEG4DecodeExe(handle,nFrameLeng)!= SSBSIP_MPEG4_DEC_RET_OK)
			break;


		/*步骤十：获得输出的缓冲*/
		SsbSipMPEG4DecodeGetConfig(handle,MPEG4_DEC_GETCONF_PHYADDR_FRAM_BUF,pYUVBuf);


		/*步骤十一：获得MPEG4视频流的下一帧*/
		nFrameLeng = NextFrameMpeg4(pFrameExCtx,&file_strm,pStrmBuf,INPUT_BUFFER_SIZE,NULL);
		if(nFrameLeng<4)
			break;


		/*步骤十二：将视频流发往LCD*/
		pp_param.src_buf_addr_phy = pYUVBuf[0];//MFC输出的缓冲
		ioctl(pp_fd,S3C_PP_SET_SRC_BUF_ADDR_PHY,&pp_param);
		
		ioctl(fb_fd,FBIOGET_FSCREENINFO,&lcd_info);
		pp_param.dst_buf_addr_phy = lcd_info.smem_start;	//LCD_frame_buffer
		ioctl(pp_fd,S3C_PP_SET_DST_BUF_ADDR_PHY,&pp_param);
		ioctl(pp_fd,S3C_PP_START);
	}
	
	/*后期处理*/
	ioctl(fb_fd,SET_OSD_STOP);
	SsbSipMPEG4DecodeDeInit(handle);


	/*释放addr，释放大小位size*/
	munmap(in_addr,file_size);
	munmap(fb_addr,fb_size);	


	/*关闭pp*/
	close(pp_fd);


	/*关闭帧缓冲模块*/
	close(fb_fd);


	/*关闭文件*/
	close(in_fd);


	return 0;
}


int main(int argc,char **argv)
{
	if(argc<1)
	{
		printf("Please input video file.\n");
		return -1;
	}
	if(MPEG4_display(argv[1]))
	{
		printf("MPEG4_display error.\n");
	}
	return 0;
}