VENC功能及参数说明

功能

实现YUV420/YVU420图片数据的编码。

• VENC支持以下格式输入：

  YUV420 semi-planner NV12/NV21-8bit

• VENC输出格式为：

  H264 BP/MP/HP

  H265 MP

VENC性能指标

入参：venc_in_msg

出参

暂无。

调用示例

void TEST_3() //venc demo
{
    int read_file_size;
    int unit_file_size;
    FILE *fp = fopen(in_file_name, "rb");
    if (fp == NULL) {
        printf("open file: %s failed.\n", in_file_name);
        return;
    }
    printf("open yuv success \n");
    fseek(fp, 0L, SEEK_END);
    int file_size = ftell(fp);
    fseek(fp, 0L, SEEK_SET);

    venc_in_msg venc_msg;
    venc_msg.width = gWidth;
    venc_msg.height = gHigh;
    venc_msg.coding_type = gFormat;
    venc_msg.YUV_store_type = gBitwidth;
    venc_msg.output_data_queue = make_shared<AutoBuffer>();
    unit_file_size = gWidth * gHigh * 3 / 2 * MAX_FRAME_NUM_VENC; //单次文件大小为16帧
    dvppapi_ctl_msg dvppApiCtlMsg;
    dvppApiCtlMsg.in = (void *)(&venc_msg);
    dvppApiCtlMsg.in_size = sizeof(venc_in_msg);
    IDVPPAPI *pidvppapi = NULL;
    CreateDvppApi(pidvppapi);
    char out_filename[] = "venc.bin";
    FILE *outputBufferFile;
    outputBufferFile = fopen (out_filename, "wb+");

    do{
        read_file_size = file_size>unit_file_size? unit_file_size:file_size; //每次读取文件大小不能超过16帧
        venc_msg.input_data = (char *)malloc(read_file_size);
        int read_len = fread(venc_msg.input_data, 1, read_file_size, fp);
        printf("file size is %d,read len is %d.\n", read_file_size, read_len);
        venc_msg.input_data_size = read_len;        

        if (pidvppapi != NULL) {
            if (DvppCtl(pidvppapi, DVPP_CTL_VENC_PROC, &dvppApiCtlMsg) != 0) {
                printf("call dvppctl process faild!\n");
                DestroyDvppApi(pidvppapi);
                fclose(fp);
                fclose(outputBufferFile);
                return;
            }
            if (venc_msg.output_data_queue->getBufferSize() > 100) { //防止编码结果只含有头部信息
                char* out_buf = venc_msg.output_data_queue->getBuffer();
                int out_buf_size = venc_msg.output_data_queue->getBufferSize();
                int write_size = fwrite(out_buf, 1, out_buf_size, outputBufferFile);
                fflush(outputBufferFile);               
            } else {
                printf("venc output data is too small : %d \n", venc_msg.output_data_queue->getBufferSize());
            }

        } else {
            printf("pidvppapi is null!\n");
        }

        if (venc_msg.input_data != NULL) {
            free(venc_msg.input_data);
            venc_msg.input_data = NULL;
        }

        file_size = file_size - unit_file_size;
    } while (file_size > 0);

    DestroyDvppApi(pidvppapi);
    fclose(outputBufferFile);
    fclose(fp);
    return;
}