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H264解码的一个測试程序
网上看到的一个H264视频格式的解码測试程序，能够用来參考其逻辑流程。
代码例如以下：
Test_Display_H264()
{
in_fd = open(H264_INPUT_FILE, O_RDONLY); //video file open
fstat(in_fd, &s); // get input file size
file_size = s.st_size;
in_addr = (char *)mmap(0, file_size, PROT_READ, MAP_SHARED, in_fd, 0); // mapping input file to memory
pp_fd = open(PP_DEV_NAME, O_RDWR); // Post processor open，不须要它为什么要打开？
fb_fd = open(FB_DEV_NAME, O_RDWR|O_NDELAY); // LCD frame buffer open
//////////////////////////////////////////////
// FrameExtractor Initialization 帧解压初始化//
//////////////////////////////////////////////
pFrameExCtx = FrameExtractorInit(FRAMEX_IN_TYPE_MEM, delimiter_h264, sizeof(delimiter_h264), 1);
file_strm.p_start = file_strm.p_cur = (unsigned char *)in_addr;
file_strm.p_end = (unsigned char *)(in_addr + file_size);
FrameExtractorFirst(pFrameExCtx, &file_strm); //流文件缓冲区起始及结束
//////////////////////////////////////
/// 1. Create new instance ///
/// (SsbSipH264DecodeInit) ///
//////////////////////////////////////
handle = SsbSipH264DecodeInit();
//////////////////////////////
///// 1.1 CreateFile /////
//////////////////////////////
hOpen = open(MFC_DEV_NAME, O_RDWR|O_NDELAY); //打开MFC设备
//////////////////////////////////////////
// 1.2 Mapping the MFC Input/Output Buffer //
//////////////////////////////////////////
// mapping shared in/out buffer between application and MFC device driver
addr = (unsigned char *) mmap(0, BUF_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, hOpen, 0);
pCTX = (_MFCLIB_H264_DEC *) malloc(sizeof(_MFCLIB_H264_DEC)); //定义解码CTX
/////////////////////////////////////////////
/// 2. Obtaining the Input Buffer ///
/// (SsbSipH264DecodeGetInBuf) ///
/////////////////////////////////////////////
pStrmBuf = SsbSipH264DecodeGetInBuf(handle, nFrameLeng);
/////////////////////////////////////////////////
///// 2.1 (DeviceIoControl) /////
///// IOCTL_MFC_GET_STRM_BUF_ADDR 0x0080000F /////
/////////////////////////////////////////////////
mfc_args.get_buf_addr.in_usr_data = http://www.mamicode.com/(int)pCTX->mapped_addr;
r = ioctl(pCTX->hOpen, IOCTL_MFC_GET_LINE_BUF_ADDR, &mfc_args);
///////////////////////////////////////////////
// 2.2 H264 CONFIG stream extraction 帧解压配置 //
//////////////////////////////////////////////
nFrameLeng = ExtractConfigStreamH264(pFrameExCtx, &file_strm, pStrmBuf, INPUT_BUFFER_SIZE, NULL);
////////////////////////////////////////////////////////////////
/// 3. Configuring the instance with the config stream ///
/// (SsbSipH264DecodeExe) ///
////////////////////////////////////////////////////////////////
SsbSipH264DecodeExe(handle, nFrameLeng);
/////////////////////////////////////////////////
///// 3.1 (DeviceIoControl) /////
///// IOCTL_MFC_H264_DEC_INIT 0x00800005 /////
/////////////////////////////////////////////////
mfc_args.dec_init.in_strmSize = lengthBufFill;
r = ioctl(pCTX->hOpen, IOCTL_MFC_H264_DEC_INIT, &mfc_args);
/////////////////////////////////////
/// 4. Get stream information ///
/////////////////////////////////////
SsbSipH264DecodeGetConfig(handle, H264_DEC_GETCONF_STREAMINFO, &stream_info);
//4.1 case H264_DEC_GETCONF_STREAMINFO
g_stream_info.width = pCTX->width;
g_stream_info.height = pCTX->height;
g_stream_info.buf_width = pCTX->buf_width;
g_stream_info.buf_height = pCTX->buf_height;
// set post processor configuration
// Structure type for IOCTL commands S3C_PP_SET_PARAMS, S3C_PP_SET_INPUT_BUF_START_ADDR_PHY,
// S3C_PP_SET_INPUT_BUF_NEXT_START_ADDR_PHY, S3C_PP_SET_OUTPUT_BUF_START_ADDR_PHY.
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; //MFC decode数据为YUV420格式
pp_param.dst_start_x = 0;
pp_param.dst_start_y = 0;
pp_param.dst_full_width = FB0_WIDTH; // destination width
pp_param.dst_full_height = FB0_HEIGHT; // destination height
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; // RGB565
pp_param.out_path = DMA_ONESHOT;
ioctl(pp_fd, S3C_PP_SET_PARAMS, &pp_param);
// get LCD frame buffer address
fb_size = pp_param.dst_full_width * pp_param.dst_full_height * 2; // RGB565
fb_addr = (char *)mmap(0, fb_size, PROT_READ | PROT_WRITE, MAP_SHARED, fb_fd, 0);
//循环解压每一帧，直到播放完成
while(1)
{
//////////////////////////////////
/// 5. DECODE ///
/// (SsbSipH264DecodeExe) ///
//////////////////////////////////
if (SsbSipH264DecodeExe(handle, nFrameLeng) != SSBSIP_H264_DEC_RET_OK)
break;
/////////////////////////////////////////////////
///// 5.1 (DeviceIoControl) /////
///// IOCTL_MFC_H264_DEC_EXE 0x00800007 /////
/////////////////////////////////////////////////
mfc_args.dec_exe.in_strmSize = lengthBufFill;
r = ioctl(pCTX->hOpen, IOCTL_MFC_H264_DEC_EXE, &mfc_args);
//////////////////////////////////////////////
/// 6. Obtaining the Output Buffer ///
/// (SsbSipH264DecodeGetOutBuf) ///
//////////////////////////////////////////////
SsbSipH264DecodeGetConfig(handle, H264_DEC_GETCONF_PHYADDR_FRAM_BUF, pYUVBuf);
//6.1 IOCTL_MFC_GET_PHY_FRAM_BUF_ADDR 0x00800013
//获取物理地址给pp使用
r = ioctl(pCTX->hOpen, IOCTL_MFC_GET_PHY_FRAM_BUF_ADDR, &mfc_args);
///////////////////////////////////////
// Next H.264 VIDEO stream 获取下一帧//
//////////////////////////////////////
nFrameLeng = NextFrameH264(pFrameExCtx, &file_strm, pStrmBuf, INPUT_BUFFER_SIZE, NULL);
if (nFrameLeng < 4) //循环结束条件
break;
// Post processing
// pp_param.SrcFrmSt MFC output buffer physical address
// pp_param.DstFrmSt LCD frame buffer physical address.
pp_param.src_buf_addr_phy = pYUVBuf[0]; // MFC output buffer
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); //pp參数设置完成，启动pp
}
SsbSipH264DecodeDeInit(handle);
munmap(in_addr, file_size);
munmap(fb_addr, fb_size);
close(pp_fd);
close(fb_fd);
close(in_fd);
return 0;
}