Class DvppDecodeVideo

Inheritance Relationships

Base Type

Class Documentation

class DvppDecodeVideo : public mindspore::dataset::TensorTransform

Decode H264/H265 video using the hardware algorithm of DVPP module on Ascend series chip.

Public Functions

inline DvppDecodeVideo(const std::vector<uint32_t> &size, VdecStreamFormat type, VdecOutputFormat out_format = VdecOutputFormat::kYuvSemiplanar420, const std::string &output = "./output")

Constructor.

Parameters

  • size – [in] Parameter vector of two integers for each dimension of input video frames, with respect to H,W order.

  • type – [in] An enum for the coding protocol of video.

    • VdecStreamFormat::kH265MainLevel, video coding protocol is H265-main level.

    • VdecStreamFormat::kH264BaselineLevel, video coding protocol is H264-baseline level.

    • VdecStreamFormat::kH264MainLevel, video coding protocol is H264-main level.

    • VdecStreamFormat::kH264HighLevel, video coding protocol is H264-high level.

  • out_format – [in] An enum for the format of output image (default=VdecOutputFormat::kYUV_SEMIPLANAR_420).

    • VdecOutputFormat::kYUV_SEMIPLANAR_420, format of output image is YUV420SP NV12 8bit.

    • VdecOutputFormat::kYVU_SEMIPLANAR_420, format of output image is YUV420SP NV21 8bit.

  • output – [in] The output path of the decoded images corresponds to video frames.

Example
namespace ds = mindspore::dataset;

/* Define operations */
std::shared_ptr<ds::TensorTransform> dvpp_decode(new ds::vision::DvppDecodeVideo({1080, 1920},
                                                 ds::VdecStreamFormat::kH265MainLevel));

/* define preprocessor */
ds::Execute preprocessor({dvpp_decode}, ds::MapTargetDevice::kCpu, 0);
inline DvppDecodeVideo(const std::vector<uint32_t> &size, VdecStreamFormat type, const std::string &output = "./output")

Constructor.

Parameters

  • size – [in] Parameter vector of two integers for each dimension of input video frames, with respect to H,W order.

  • type – [in] An enum for the coding protocol of video.

    • VdecStreamFormat::kH265MainLevel, video coding protocol is H265-main level.

    • VdecStreamFormat::kH264BaselineLevel, video coding protocol is H264-baseline level.

    • VdecStreamFormat::kH264MainLevel, video coding protocol is H264-main level.

    • VdecStreamFormat::kH264HighLevel, video coding protocol is H264-high level.

  • output – [in] The output path of the decoded images corresponds to video frames.

Example
namespace ds = mindspore::dataset;

/* Define operations */
std::shared_ptr<ds::TensorTransform> dvpp_decode(new ds::vision::DvppDecodeVideo({1080, 1920}));

/* define preprocessor */
ds::Execute preprocessor({dvpp_decode}, ds::MapTargetDevice::kCpu, 0);
~DvppDecodeVideo() = default

Destructor.