How to use the vpu lib (base on C)on our firfly-rk3288

isle

as you gus know .the vpu works fine on our android os. and we can use it by android api "mediacodec".

today.i will to show you how to use it directly.

the libs we need :

1. LOCAL_SHARED_LIBRARIES := \
   
2.         libvpu \
   
3.         librk_on2 \
   
4.         libcutils \
   
5.         liblog \

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the head file path

1. LOCAL_C_INCLUDES := \
   
2. $(TOP)/hardware/rk29/libon2/

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actualy ,we need :
hardware/rk29/libon2/vpu_api.h
hardware/rk29/libon2/vpu_global.h
hardware/rk29/libon2/vpu_mem.h


first of all , open the vpu and get the context:

1.     struct VpuCodecContext* ctx=NULL;
   
2.     vpu_open_context(&ctx);

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then ,  initialize it:

1.     ctx->codecType=cmd->codec_type;  // CODEC_DECODER?
   
2.     ctx->videoCoding=cmd->coding;   
   
3.     ctx->width=cmd->width;
   
4.     ctx->height=cmd->height;
   
5.     ctx->no_thread=1;
   
6. 
   
7.     ret=ctx->init(ctx, pExtra, extraSize)

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now we can do decode ：
get a packet from your file .

1. VideoPacket_t* pkt =NULL;

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after decoding :

1. ret=ctx->decode(ctx, pkt, pOut)

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we get a out packet

1. DecoderOut_t *pOut=NULL;

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ok  we get the output .how to use it?

the data of pOut contains :

1. VPU_FRAME *frame=(VPU_FRAME *)(pOut->data);

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both virtual and physical address of the decoded frame are contained in structure named VPU_FRAME,
if you want to use virtual address, make sure you have done VPUMemLink before.

1. VPUMemLink(&frame->vpumem);

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save the output data :

1. fwrite((U8*)(frame->vpumem.vir_addr), 1, frameSize, pOutFile);

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remember use VPUFreeLinear to free, otherwise memory leak will give you a surprise.

1. VPUFreeLinear(&frame->vpumem);

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done !

youbainiao

hi,isle,

I want to use rk3288 video HW(hevc) decoder on linux,I use libhyris directly invoke the libvpu method,Can this be achieved?

youbainiao

hi,isle,

I want to use rk3288 video HW(hevc) decoder on linux,I use libhyris directly invoke the libvpu method,Can this be achieved?

isle

In theory，It can work.
you could try。

youbainiao

isle Posted at 10/9/2015 15:48
In theory，It can work.
you could try。

hi,isle,

Thank you for your reply,I intend to do so, can you give me some advice do?such as,about vpu service,Is available under Linux?

youbainiao

isle Posted at 10/9/2015 15:48
In theory，It can work.
you could try。

hi,isle,

If I want to use h265 lib directly,which libs is need?

isle

h265?
the libhevcdec.so is needed.

youbainiao

isle Posted at 10/15/2015 10:33
h265?
the libhevcdec.so is needed.

You mean I just need to libhevcdec.so,no need libvpu.so?What is the relationship between these two libraries?

mac_l1

hi guys!

to add some info here:
libvpu is mainly needed for VPU/GPU memory access; librkon2 is needed for encoding/decoding; librkon2 uses other rk libs like libhevcdec to do its magic.
librkffplayer is a more complete library based on ffplayer lib to (de)mux and encoding/decoding streams and is used by androids stagefright, not yet available in machybris but can be quite easily added.
machybris also exposes the very high level api for androids media service by libmedia: ubuntu made this for their ubuntu touch/phablet products

hope this helps...

youbainiao

mac_l1 Posted at 10/28/2015 15:06
hi guys!

to add some info here:

Thank you very much.