CN103260021A - Method and device for decoding videos - Google Patents
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Abstract
The invention discloses a method and device for decoding videos. The method for decoding the videos includes the steps: inquiring that whether a graphic processing unit (GPU) supports decoding of videos to be decoded or not and acquiring corresponding decoding capacity information if the GPU supports the decoding of the videos to be decoded, judging that whether the acquired decoding capacity information is real or not and carrying out the decoding on the videos to be decoded by the GPU if the acquired decoding capacity information is real, and carrying out the decoding on the videos to be decoded through a preset decoding manner if the GPU does not support the decoding of the videos to be decoded or the acquired decoding capacity information is not real. The method for decoding the videos is adopted so that safety and reliability of the video decoding process can be improved.
Description
Technical field
The present invention relates to field of computer technology, particularly a kind of video encoding/decoding method and device.
Background technology
Because improving constantly of video resolution, code check, the complexity of video decode are also in continuous raising, video decode calculates shared system resource and is also continuing to increase accordingly.With CPU(Central Processing Unit, central processing unit) carry out video decode (soft decoding) and will take a large amount of CPU computational resources, even the needs that the CPU computational resource can't satisfy high-resolution, high code check might appear.So use GPU(Graphic Processing Unit all occurred to handheld device recent years from PC to the notebook, graphic process unit, the core component of show handling generally is installed on the video card) carry out the trend of video decode.Because GPU has powerful parallel computation function, be fit to video decode, can easily realize 1080P(high-definition digital video display format of tens code checks) decoding of video.So GPU decoding in the future will become the mainstream technology of video decode.
In the GPU decode procedure; the video card driver (or claims driver; some GPU is integrated among mainboard or the CPU) can pass through DXVA (DirectX Video Acceleration usually; vision hardware accelerates, the standard that a kind of video of Microsoft's customization accelerates) interface is to the decoding capability of application program (generally being video player) report GPU.As shown in table 1, Microsoft has defined some decoding capabilities for GPU in the DXVA standard.
Table 1
DXVA_ModeNone
DXVA_ModeH261_A
DXVA_ModeH261_B
DXVA_ModeH263_A
DXVA_ModeH263_B
DXVA_ModeH263_C
DXVA_ModeH263_D
DXVA_ModeH263_E
DXVA_ModeH263_F
DXVA_ModeMPEG1_A
DXVA_ModeMPEG2_A
DXVA_ModeMPEG2_B
DXVA_ModeMPEG2_C
DXVA_ModeMPEG2_D
DXVA_ModeH264_A
DXVA_ModeH264_B
DXVA_ModeH264_C
DXVA_ModeH264_D
DXVA_ModeH264_E
DXVA_ModeH264_F
DXVA_ModeWMV8_A
DXVA_ModeWMV8_B
DXVA_ModeWMV9_A
DXVA_ModeWMV9_B
DXVA_ModeWMV9_C
DXVA_ModeVC1_A
DXVA_ModeVC1_B
DXVA_ModeVC1_C
DXVA_ModeVC1_D
In table 1, different decoding capability correspondences different mode of operation and video code models, general every kind of GPU possesses the various video decoding capability in the above-mentioned tabulation, namely can support the decoding of various video file format.Each video decoding capability has corresponding COM(Component Object Model, The Component Object Model) interface, also can be called decoding interface.Generally, the information of the unsupported video decoding capability of GPU can not report by the DXVA interface.In other words generally speaking, the video player GPU video decoding capability information that can inquire by the DXVA interface all is true available.
Yet the inventor finds that there are the following problems at least for prior art:
Bugs or some other reason owing to driver, in the GPU decoding capability information that driver reports by the DXVA interface, the decoding capability information that may have mistake, be the decoding capability that driver has reported GPU not possess, the com interface of this decoding capability information correspondence is called as the dummy(falseness) interface.Video player uses the dummy interface to carry out the collapse that video decode will cause application program.
Summary of the invention
The object of the present invention is to provide a kind of video encoding/decoding method and device, to improve fail safe and the reliability of video decoding process, for this reason, the embodiment of the invention adopts following technical scheme:
A kind of video encoding/decoding method is characterized in that, comprising:
Whether inquiry graphic process unit GPU supports the decoding of video to be decoded, if support, then obtains corresponding decoding capability information;
Judge whether the decoding capability information of obtaining is true, if true, then treat decoded video by described GPU and decode;
If GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treats decoded video by default decoding process and decodes.
A kind of video decoder is characterized in that, comprising:
Enquiry module is used for the decoding whether inquiry graphic process unit GPU supports video to be decoded, if support, then obtains corresponding decoding capability information;
Decoder module is used for judging whether the decoding capability information of obtaining is true, if true, then treat decoded video by described GPU and decode; If GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treats decoded video by default decoding process and decodes.
The above embodiment of the present invention, whether inquiry GPU supports the decoding of video to be decoded, if support, then obtain corresponding decoding capability information, and judge whether the decoding capability information of obtaining is true, if it is true, then treat decoded video by described GPU and decode, if GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treat decoded video by default decoding process and decode, can improve fail safe and the reliability of video decoding process.
Description of drawings
One of schematic flow sheet of the video encoding/decoding method that Fig. 1 provides for the embodiment of the invention;
Two of the schematic flow sheet of the video encoding/decoding method that Fig. 2 provides for the embodiment of the invention;
The structural representation of the video decoder that Fig. 3 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing among the present invention, the technical scheme among the present invention is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, all other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work belong to the scope of protection of the invention.
The embodiment of the invention, whether application program (being specifically as follows video player) inquiry graphic process unit GPU supports the decoding of video to be decoded, if support, then obtain corresponding decoding capability information, judge whether the decoding capability information of obtaining is true, if it is true, then treating decoded video by described GPU decodes, if GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treat decoded video by default decoding process and decode, thereby can improve fail safe and the reliability of video decoding process.
GPU decoding capability information can comprise rough decoding capability information and the ability information of accurately decoding.Rough decoding capability information is the information that can limit the GPU decoding capability roughly, as being the information of the decoding capability of GPU definition in the DXVA standard of listing in the table 1, can determine the mode of operation of the video decode that GPU can support by these rough decoding capability information, wherein comprise two parts information, part information is the video code model (H261 that supports, H263, H264, MPEG2 etc.), for example " DXVA_ModeH261_A " shows that GPU can support the decoding of the video of H261 coded format, another part information is A wherein, B, C, D represent GPU when the video of certain coded format is decoded the decoding step that can finish, for example, the coded format of H261 comprises two steps in decode procedure, " DXVA_ModeH261_A " shows that GPU is merely able to finish first step, remaining step need be finished by CPU, and " DXVA_ModeH261_B " represents that then GPU can independently finish two steps of H261 video decode.Accurately the decoding ability information is the information that can accurately limit the GPU decoding capability, dispose (resolution, code check, buffer memory frame number, color space form etc.) as the decoding that GPU can support when the video of certain coded format is decoded, for example, certain GPU can support code check, 22 buffer memory frame number and the color space form of NV12 of 1280 * 720 resolution, 2000kbps under the mode of operation of DXVA_ModeH261_B.
As shown in Figure 1, the handling process of the video encoding/decoding method that provides for the embodiment of the invention specifically may further comprise the steps:
Step 101, whether application queries GPU supports the decoding of video to be decoded, if support that then execution in step 102, otherwise, execution in step 105.
Concrete, whether application queries GPU supports the process of the decoding of video to be decoded to comprise the steps:
Step 1, application program are obtained the rough decoding capability information of GPU.
When video to be decoded need be decoded, application program can be passed through system program (as the windows(form) operating system) set up and being connected of the driver of GPU.Concrete, application program generates DXVA Output(output) the Pin(interface), and use DXVA Output Pin to be connected to VMR(Video Mixing Renderer, VMR) interface that is used for application program connection GPU driver that IAMVideoAccelerator Input Pin(windows system provides, can be referred to as GPU and drive connecting interface, belong to a kind of of DXVA interface), generate corresponding Filter Graph(filter figure, a plurality of linking together exactly, finish the combination of the filter of specific function (such as video playback, Video Capture)).
Application program set up with being connected of the driver of GPU after, can inquire about the rough decoding capability information of GPU to driver, after driver receives query statement, send the rough decoding capability information of GPU to application program, comprise DXVA_ModeH261_B, DXVA_ModeH263_B, DXVA_ModeMPEG1_A, DXVA_ModeMPEG2_B etc. as the rough decoding capability information of this GPU.
Step 2, when the rough decoding capability information of coded format that exist to support video to be decoded in the rough decoding capability information of obtaining, application program continues whether inquiry GPU supports video to be decoded under the mode of operation of this rough decoding capability information correspondence decoding configuration information, if show that then step 101 Query Result is the decoding that GPU can support video to be decoded.If there is not the rough decoding capability information of the coded format of supporting video to be decoded in the rough decoding capability information of obtaining, perhaps inquire GPU and do not support the decoding configuration information of video to be decoded under this mode of operation, the Query Result that then shows step 101 is the decoding that GPU can not support video to be decoded.
Concrete, application program can get access to coded format and the decoding configuration information of this video from the file of video to be decoded, this coded format can comprise H261, H263, H264, MPEG2 etc., and this decoding configuration information can comprise information such as resolution, code check, buffer memory frame number, color space form.
Concrete, application program is searched the rough decoding capability information of the coded format that can support video to be decoded in the rough decoding capability information that driver reports, if can find, then further will this rough decoding capability information and the decoding configuration information of video to be decoded send to the GPU driver, under corresponding mode of operation, whether supporting corresponding decoding configuration with inquiry GPU.For example (configuration information of herein decoding is the example explanation with resolution and code check only), the coded format of certain video is H261, resolution is 1280 * 720, code check 2000kbps, and hypothesis GPU supports the mode of operation of DXVA_ModeH261_B, and the highlyest under this mode of operation can support 1280 * 720 resolution, the code check of 3000kbps, video player driver report find DXVA_ModeH261_B in the rough decoding capability information after, with DXVA_ModeH261_B, 1280 * 720 and 2000kbps send to driver, whether GPU supports 1280 * 720 resolution and the code check of 2000kbps under the mode of operation of DXVA_ModeH261_B with inquiry, and driver can return the information of " support ".
Step 102, application program are obtained corresponding decoding capability information.Concrete, this decoding capability information comprises the rough decoding capability information of the coded format of supporting video to be decoded, and the accurate decoding ability information corresponding with the decoding configuration information of video to be played.
Continuing to use above-mentioned example describes, when video player confirms that GPU can support under the mode of operation of DXVA_ModeH261_B the code check of 1280 * 720 resolution and 2000kbps, video player can confirm that just rough decoding capability information is DXVA_ModeH261_B in the decoding capability information of GPU, and the ability information of accurately decoding is for supporting 1280 * 720 resolution and the code check of 2000kbps.
Step 103, application program judge whether the decoding capability information of obtaining is true, if true, then execution in step 104, otherwise, execution in step 105.
Concrete, application program is carried out by the Execute(that GPU drives connecting interface (above-mentioned IAMVideoAccelerator Input Pin)) function, judge whether the decoding capability information of obtaining is true.Specifically can, earlier the structure DXVA_ConfigQueryOrReplyFunc of Execute function is carried out the assignment of QueryOrReplyFlag=0xFFFFF1, bDXVA_Func=1; Obtain the return value of Execute function then, when described return value is 0, the decoding capability information truth that obtains, when described return value was not 0, the decoding capability information of obtaining was untrue.
Step 104, application program is treated decoded video by GPU and is decoded.
Concrete, application program is determined the decoding interface of the decoding capability information correspondence obtained earlier, by this decoding interface video to be decoded is sent to described GPU then and decodes.When GPU decodes, decoded video is shown output.
Step 105, application program is treated decoded video by default decoding process and is decoded.Wherein, default decoding process is default decoding process, can be other decoding processes outside the GPU decoding, can according to circumstances preestablish.
Preferably, application program is treated decoded video by soft decoding process and is decoded.Concrete, at first, the application program disconnection is connected with IAMVideoAccelerator Input Pin's, namely destroys corresponding Filter Graph(filter); Then, application program foundation is connected with video output interface, for example application program can generate the interface that YV12 Output Pin(carries out the video demonstration, be called video output interface), use YV12 Output Pin is connected to the YV12 Input Pin of VMR, to regenerate Filter Graph; Treat decoded video and decode, and by video output interface decoded video is shown output.
The above embodiment of the present invention, whether inquiry GPU supports the decoding of video to be decoded, if support, then obtain corresponding decoding capability information, and judge whether the decoding capability information of obtaining is true, if it is true, then treat decoded video by described GPU and decode, if GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treat decoded video by default decoding process and decode, can improve fail safe and the reliability of video decoding process.
As shown in Figure 2, the handling process of video encoding/decoding method in concrete application scenarios for the embodiment of the invention provides specifically may further comprise the steps:
The above embodiment of the present invention, whether inquiry GPU supports the decoding of video to be decoded, if support, then obtain corresponding decoding capability information, and judge whether the decoding capability information of obtaining is true, if it is true, then treat decoded video by described GPU and decode, if GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treat decoded video by default decoding process and decode, can improve fail safe and the reliability of video decoding process.
Based on identical technical conceive, the embodiment of the invention also provides a kind of video decoder, as shown in Figure 3, comprising:
Enquiry module 310 is used for the decoding whether inquiry graphic process unit GPU supports video to be decoded, if support, then obtains corresponding decoding capability information;
Decoder module 320 is used for judging whether the decoding capability information of obtaining is true, if true, then treat decoded video by described GPU and decode; If GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treats decoded video by default decoding process and decodes.
Preferably, described decoding capability information comprises rough decoding capability information and the ability information of accurately decoding;
Described enquiry module 310 specifically is used for:
Obtain the rough decoding capability information of GPU;
When the rough decoding capability information of coded format that exist to support described video to be decoded in the rough decoding capability information of obtaining, whether inquiry GPU supports the decoding configuration information of described video to be decoded under the mode of operation of this rough decoding capability information correspondence;
If support, then obtain the rough decoding capability information of supporting described coded format, and the accurate decoding ability information corresponding with described decoding configuration information.
Preferably, described decoder module 320, the concrete Execute function that is used for driving by GPU connecting interface judges whether the decoding capability information of obtaining is true.
Preferably, described decoder module 320 specifically is used for:
The structure DXVA_ConfigQueryOrReplyFunc of Execute function is carried out the assignment of QueryOrReplyFlag=0xFFFFF1, bDXVA_Func=1;
Obtain the return value of Execute function, when described return value is 0, the decoding capability information truth that obtains, when described return value was not 0, the decoding capability information of obtaining was untrue.
Preferably, described decoder module 320 specifically is used for:
Determine the decoding interface of the decoding capability information correspondence obtained;
By described decoding interface video to be decoded being sent to described GPU decodes.
Preferably, described default decoding process is specially soft decoding process.
The above embodiment of the present invention, whether inquiry GPU supports the decoding of video to be decoded, if support, then obtain corresponding decoding capability information, and judge whether the decoding capability information of obtaining is true, if it is true, then treat decoded video by described GPU and decode, if GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treat decoded video by default decoding process and decode, can improve fail safe and the reliability of video decoding process.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a station terminal equipment (can be mobile phone, personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.
Claims (12)
1.
A kind of video encoding/decoding method is characterized in that, comprising:
Whether inquiry graphic process unit GPU supports the decoding of video to be decoded, if support, then obtains corresponding decoding capability information;
Judge whether the decoding capability information of obtaining is true, if true, then treat decoded video by described GPU and decode;
If GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treats decoded video by default decoding process and decodes.
2.
The method of claim 1 is characterized in that, described decoding capability information comprises rough decoding capability information and the ability information of accurately decoding;
Whether described inquiry GPU supports the decoding of video to be decoded, if support, then obtains corresponding decoding capability information, is specially:
Obtain the rough decoding capability information of GPU;
When the rough decoding capability information of coded format that exist to support described video to be decoded in the rough decoding capability information of obtaining, whether inquiry GPU supports the decoding configuration information of described video to be decoded under the mode of operation of this rough decoding capability information correspondence;
If support, then obtain the rough decoding capability information of supporting described coded format, and the accurate decoding ability information corresponding with described decoding configuration information.
3.
The method of claim 1 is characterized in that, whether the decoding capability information that described judgement is obtained is true, is specially:
By the Execute function of GPU driving connecting interface, judge whether the decoding capability information of obtaining is true.
4.
Method as claimed in claim 3 is characterized in that, the described Execute function that drives connecting interface by GPU judges whether the decoding capability information of obtaining is true, is specially:
The structure DXVA_ConfigQueryOrReplyFunc of Execute function is carried out the assignment of QueryOrReplyFlag=0xFFFFF1, bDXVA_Func=1;
Obtain the return value of Execute function, when described return value is 0, the decoding capability information truth that obtains, when described return value was not 0, the decoding capability information of obtaining was untrue.
5.
The method of claim 1 is characterized in that, treats decoded video by described GPU and decodes, and is specially:
Determine the decoding interface of the decoding capability information correspondence obtained;
By described decoding interface video to be decoded being sent to described GPU decodes.
6.
The method of claim 1 is characterized in that, described default decoding process is specially soft decoding process.
?
7.
A kind of video decoder is characterized in that, comprising:
Enquiry module is used for the decoding whether inquiry graphic process unit GPU supports video to be decoded, if support, then obtains corresponding decoding capability information;
Decoder module is used for judging whether the decoding capability information of obtaining is true, if true, then treat decoded video by described GPU and decode; If GPU does not support the decoding of video to be decoded, or the decoding capability information of obtaining is untrue, then treats decoded video by default decoding process and decodes.
8.
Device as claimed in claim 7 is characterized in that, described decoding capability information comprises rough decoding capability information and the ability information of accurately decoding;
Described enquiry module specifically is used for:
Obtain the rough decoding capability information of GPU;
When the rough decoding capability information of coded format that exist to support described video to be decoded in the rough decoding capability information of obtaining, whether inquiry GPU supports the decoding configuration information of described video to be decoded under the mode of operation of this rough decoding capability information correspondence;
If support, then obtain the rough decoding capability information of supporting described coded format, and the accurate decoding ability information corresponding with described decoding configuration information.
9.
Device as claimed in claim 7 is characterized in that, described decoder module, and the concrete Execute function that is used for driving by GPU connecting interface judges whether the decoding capability information of obtaining is true.
10.
Device as claimed in claim 9 is characterized in that, described decoder module specifically is used for:
The structure DXVA_ConfigQueryOrReplyFunc of Execute function is carried out the assignment of QueryOrReplyFlag=0xFFFFF1, bDXVA_Func=1;
Obtain the return value of Execute function, when described return value is 0, the decoding capability information truth that obtains, when described return value was not 0, the decoding capability information of obtaining was untrue.
11.
Device as claimed in claim 7 is characterized in that, described decoder module specifically is used for:
Determine the decoding interface of the decoding capability information correspondence obtained;
By described decoding interface video to be decoded being sent to described GPU decodes.
12.
Device as claimed in claim 7 is characterized in that, described default decoding process is specially soft decoding process.
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| CN111246214B (en) * | 2018-11-28 | 2022-05-06 | 杭州海康威视数字技术股份有限公司 | Video decoding method and device |
| CN112532569A (en) * | 2019-09-19 | 2021-03-19 | 澜至电子科技（成都）有限公司 | Video code stream protection device, method and storage medium |
| CN112532569B (en) * | 2019-09-19 | 2022-05-31 | 澜至电子科技（成都）有限公司 | Video code stream protection device, method and storage medium |
| CN112788431A (en) * | 2020-12-24 | 2021-05-11 | 四川云从天府人工智能科技有限公司 | Video playing method, device, system, medium and browser based on HTML5 |
| CN115546329A (en) * | 2022-12-01 | 2022-12-30 | 广州市保伦电子有限公司 | Audio and video hardware accelerated transcoding detection method and system |
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