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H264解码的一个測试程序

發布時間：2025/3/15 编程问答 18 豆豆

生活随笔收集整理的這篇文章主要介紹了 H264解码的一个測试程序小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

????? ?網上看到的一個H264視頻格式的解碼測試程序，能夠用來參考其邏輯流程。

代碼例如以下：

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，不須要它為什么要打開？

????? fb_fd = open(FB_DEV_NAME, O_RDWR|O_NDELAY);?????????????????????????????????????// LCD frame buffer open
????????????????

????? //
????? // FrameExtractor Initialization 幀解壓初始化//
????? //
????? 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);????????????????????????????????????? //流文件緩沖區起始及結束

????? //

????? ///??? 1. Create new instance????? ///
????? ///????? (SsbSipH264DecodeInit)??? ///
????? //
???? handle = SsbSipH264DecodeInit();

???? //
??? ?/???? 1.1 CreateFile???? /
???? //
???? hOpen = open(MFC_DEV_NAME, O_RDWR|O_NDELAY);?? //打開MFC設備
???
??? //
??? // 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));?? //定義解碼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 = (int)pCTX->mapped_addr;
??? r = ioctl(pCTX->hOpen, IOCTL_MFC_GET_LINE_BUF_ADDR, &mfc_args);

??? ///
??? // 2.2 H264 CONFIG stream extraction 幀解壓配置 //
??? //
??? 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數據為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);

???? //循環解壓每一幀，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
??? ??????? //獲取物理地址給pp使用
??? ??????? r = ioctl(pCTX->hOpen, IOCTL_MFC_GET_PHY_FRAM_BUF_ADDR, &mfc_args);

?????????? ?///
?????????? ?// Next H.264 VIDEO stream 獲取下一幀//
??????????? //
??????????? nFrameLeng = NextFrameH264(pFrameExCtx, &file_strm, pStrmBuf, INPUT_BUFFER_SIZE, NULL);
??????????? if (nFrameLeng < 4) //循環結束條件
???????????????? 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參數設置完成，啟動pp
????? }

????? SsbSipH264DecodeDeInit(handle);

?????? munmap(in_addr, file_size);
?????? munmap(fb_addr, fb_size);
?????? close(pp_fd);
?????? close(fb_fd);
?????? close(in_fd);

?????? return 0;
}

轉載于:https://www.cnblogs.com/mfrbuaa/p/3926499.html

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