mpp_linux_demo 运行报错

jishutao

您好，
    我在ROOT平台上，下载了mpp_linux_cpp-master源码，想使用MPP,RGA,DRM实现解码显示功能，报错如下：

./mpp_linux_demo
mpp[1641]: mpp_info: mpp version: 31814aea author: Herman Chen   2021-09-30 [vepu]: Add offset_x offset_y support for vepu
mpp[1641]: mpp_rt: NOT found ion allocator
mpp[1641]: mpp_rt: found drm allocator
failed to open rga dev /dev/v4l/by-path/platform-ff680000.rga-video-index0.
failed to exec mRGA->init -1.
failed to init codec
mpp[1641]: mpp_meta: ~MppMetaService cleaning leaked metadata
mpp[1641]: mpp_buffer: ~MppBufferService cleaning leaked group
mpp[1641]: mpp_buffer: ~MppBufferService cleaning leaked buffer
mpp_linux_demo[1641]: mpp_mem_pool: put_pool found 2 used buffer size 80
mpp_linux_demo[1641]: mpp_mem_pool: put_pool found 5 used buffer size 192

看起来是打开RGA设备结点时失败，代码中显示打开了"/dev/v4l/by-path/platform-ff680000.rga-video-index0"这个设备文件。不知道是什么原因导致的失败，请支持我一下，十分感谢。

jishutao

[root@RK356X:/userdata/overlay]# cd /dev/v4l/by-path/
[root@RK356X:/dev/v4l/by-path]# ls
platform-rkisp-vir0-video-index0  platform-rkisp-vir0-video-index5
platform-rkisp-vir0-video-index1  platform-rkisp-vir0-video-index6
platform-rkisp-vir0-video-index2  platform-rkisp-vir0-video-index7
platform-rkisp-vir0-video-index3  platform-rkisp-vir0-video-index8
platform-rkisp-vir0-video-index4

jishutao

您好：
    如果我把RGA的设备结点文件改为/dev/rga会报另一种错误，如下：
./mpp_linux_demo
mpp[894]: mpp_info: mpp version: 31814aea author: Herman Chen   2021-09-30 [vepu]: Add offset_x offset_y support for vepu
mpp[894]: mpp_rt: NOT found ion allocator
mpp[894]: mpp_rt: found drm allocator
failed to ioctl VIDIOC_QUERYCAP.
failed to exec chk_dev_cap -1.
failed to exec mRGA->init -2.
failed to init codec
mpp[894]: mpp_meta: ~MppMetaService cleaning leaked metadata
mpp[894]: mpp_buffer: ~MppBufferService cleaning leaked group
mpp[894]: mpp_buffer: ~MppBufferService cleaning leaked buffer
mpp_linux_demo[894]: mpp_mem_pool: put_pool found 2 used buffer size 80
mpp_linux_demo[894]: mpp_mem_pool: put_pool found 5 used buffer size 192

jishutao

您好：
    我的设备上有/dev/rga这个东西，按手册上讲的，应该是RGA驱动正常加载了。

wangjianli

请问你的问题解决了吗？