Video Decoding
cudacodec::VideoReader
Video reader interface.
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class cudacodec::VideoReader
Note
- An example on how to use the videoReader class can be found at opencv_source_code/samples/gpu/video_reader.cpp
cudacodec::VideoReader::nextFrame
Grabs, decodes and returns the next video frame.
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C++: bool cudacodec::VideoReader::nextFrame(OutputArray frame)
If no frames has been grabbed (there are no more frames in video file), the methods return false . The method throws Exception if error occurs.
cudacodec::Codec
Video codecs supported by cudacodec::VideoReader .
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C++: enum cudacodec::Codec
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MPEG1 = 0
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MPEG2
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MPEG4
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VC1
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H264
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JPEG
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H264_SVC
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H264_MVC
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Uncompressed_YUV420 = (('I'<<24)|('Y'<<16)|('U'<<8)|('V'))
Y,U,V (4:2:0)
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Uncompressed_YV12 = (('Y'<<24)|('V'<<16)|('1'<<8)|('2'))
Y,V,U (4:2:0)
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Uncompressed_NV12 = (('N'<<24)|('V'<<16)|('1'<<8)|('2'))
Y,UV (4:2:0)
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Uncompressed_YUYV = (('Y'<<24)|('U'<<16)|('Y'<<8)|('V'))
YUYV/YUY2 (4:2:2)
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Uncompressed_UYVY = (('U'<<24)|('Y'<<16)|('V'<<8)|('Y'))
UYVY (4:2:2)
cudacodec::createVideoReader
Creates video reader.
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C++: Ptr<VideoReader> cudacodec::createVideoReader(const String& filename)
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C++: Ptr<VideoReader> cudacodec::createVideoReader(const Ptr<RawVideoSource>& source)
Parameters: |
- filename – Name of the input video file.
- source – RAW video source implemented by user.
|
FFMPEG is used to read videos. User can implement own demultiplexing with cudacodec::RawVideoSource .
cudacodec::RawVideoSource
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class cudacodec::RawVideoSource
Interface for video demultiplexing.
class RawVideoSource
{
public:
virtual ~RawVideoSource() {}
virtual bool getNextPacket(unsigned char** data, int* size, bool* endOfFile) = 0;
virtual FormatInfo format() const = 0;
};
User can implement own demultiplexing by implementing this interface.
cudacodec::RawVideoSource::getNextPacket
Returns next packet with RAW video frame.
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C++: bool cudacodec::VideoSource::getNextPacket(unsigned char** data, int* size, bool* endOfFile) = 0
Parameters: |
- data – Pointer to frame data.
- size – Size in bytes of current frame.
- endOfStream – Indicates that it is end of stream.
|
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