ODROID XU4 s5p-mfc H264 DECODER/ENCODER DEMO exynos5422

向右看齐 2022-06-02 12:28 141阅读 0赞

先下载最新的ODROID xu4 镜像。  
[https://wiki.odroid.com/odroid-xu4/os\_images/linux/ubuntu\_4.14/20171213][https_wiki.odroid.com_odroid-xu4_os_images_linux_ubuntu_4.14_20171213]

一定要下载最新的。旧版本会出现驱动不兼容，出现以下bug：

mfc.c:mfc_create:85: error: Cannot subscribe EOS event for MFC
    14583.706270073:mfc.c:mfc_create:87: MFC device /dev/video7 opened with fd=3
    mfc.c:mfc_set_rate:144: error: Cannot set rate on 3
    This is apparently related to the kernel version being too old:
    https://patchwork.linuxtv.org/patch/21589/
    According to the above post, the EOS error is fixed for kernel > 3.12

我用的img版本是：  
ubuntu-16.04.3-4.14-minimal-odroid-xu4-20171213.img.xz

之后，下载测试源码。博主只对encodec做了验证。  
git clone [https://github.com/abhijeet-dev/public-apps][https_github.com_abhijeet-dev_public-apps]

拷贝到板子后，运行一下命令：

./mfc-encode  -m /dev/video11 -o test.h264 -c h264 -d 1000 -r 25 -s 1280x720

以上命令没有指定输入的摄像头。因为手头的摄像头有点问题，运行不起来。  
如果没有指定输入摄像头，则输入默认为一下函数：

static int in_demo_read(struct io_dev *dev, int nbufs, char **bufs, int *lens)
    {
        struct in_demo_priv *p;
        int x, y;
        int i, j;
        int size;
        double rx, ry;
        int t;
        p = dev->priv;
        if (nbufs != 2)
            return -1;
        t = dev->io[DIR_OUT].counter;
        size = p->width * p->height;
        if (size > lens[0] || size > 2 * lens[1]) {
            err("Size=%d len=%d,%d", size, lens[0], lens[1]);
            return -1;
        }
        memset(bufs[0], 0, size);
        memset(bufs[1], 128, size / 2);
        rx = cos(7 * t / 3.14 / 25 * 100 / p->width);
        ry = sin(6 * t / 3.14 / 25 * 100 / p->width);
        x = (rx + 1) / 2 * (p->width - 2 * SQUARE_SIZE) + SQUARE_SIZE;
        y = (ry + 1) / 2 * (p->height - 2 * SQUARE_SIZE) + SQUARE_SIZE;
        for (i = MIN(SQUARE_SIZE, p->width) - 1; i >= 0; --i)
            for (j = MIN(SQUARE_SIZE, p->height) - 1; j >= 0; --j)
                bufs[0][x + i + (y + j) * p->width] = 128;//255;
        return size;
    }

最新的mfc驱动已经集成到v4l2驱动中。用以下命令可以看出decoder和encoder分别注册到那个v4l2驱动下。

[    3.373562] s5p-mfc 11000000.codec: decoder registered as /dev/video10
    [    3.380006] s5p-mfc 11000000.codec: encoder registered as /dev/video11

Usage: ./mfc-encode [args]
            -i <device> - FIMC camera device (e.g. /dev/video1)                         If not specified demo input device is used
            -m <device> - (required) MFC device (e.g. /dev/video8)         -o <file> - Output file name         -c <codec>[,param[=val]]...                       - The codec of the encoded stream optionally                         followed by comma separated parameters.
                            Available codecs: mpeg4, h263, h264
            -d <duration> - Number of frames to encode         -r <rate> - Frame rate         -s <size> - Size of frame in format WxH Codec parameters:

生成的test.h264用vlc播放效果如下图：

![这里写图片描述][SouthEast]  
博主的需求是编码外部YUV数据，只需将in\_demod.c里面的函数改为我的yuv输入即可。

QQ:501930128

[https_wiki.odroid.com_odroid-xu4_os_images_linux_ubuntu_4.14_20171213]: https://wiki.odroid.com/odroid-xu4/os_images/linux/ubuntu_4.14/20171213
[https_github.com_abhijeet-dev_public-apps]: https://github.com/abhijeet-dev/public-apps
[SouthEast]: /images/20220602/fbaa1f0eb77c4329bd610cf1690f10f5.png