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156 lines
3.7 KiB
156 lines
3.7 KiB
Video Decoding |
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============== |
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.. highlight:: cpp |
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cudacodec::VideoReader |
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---------------------- |
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Video reader interface. |
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.. ocv:class:: cudacodec::VideoReader |
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.. note:: |
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* An example on how to use the videoReader class can be found at opencv_source_code/samples/gpu/video_reader.cpp |
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cudacodec::VideoReader::nextFrame |
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--------------------------------- |
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Grabs, decodes and returns the next video frame. |
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.. ocv:function:: bool cudacodec::VideoReader::nextFrame(OutputArray frame) |
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If no frames has been grabbed (there are no more frames in video file), the methods return ``false`` . The method throws :ocv:class:`Exception` if error occurs. |
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cudacodec::VideoReader::format |
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------------------------------ |
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Returns information about video file format. |
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.. ocv:function:: FormatInfo cudacodec::VideoReader::format() const |
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cudacodec::Codec |
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---------------- |
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Video codecs supported by :ocv:class:`cudacodec::VideoReader` . |
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.. ocv:enum:: cudacodec::Codec |
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.. ocv:emember:: MPEG1 = 0 |
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.. ocv:emember:: MPEG2 |
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.. ocv:emember:: MPEG4 |
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.. ocv:emember:: VC1 |
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.. ocv:emember:: H264 |
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.. ocv:emember:: JPEG |
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.. ocv:emember:: H264_SVC |
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.. ocv:emember:: H264_MVC |
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.. ocv:emember:: Uncompressed_YUV420 = (('I'<<24)|('Y'<<16)|('U'<<8)|('V')) |
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Y,U,V (4:2:0) |
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.. ocv:emember:: Uncompressed_YV12 = (('Y'<<24)|('V'<<16)|('1'<<8)|('2')) |
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Y,V,U (4:2:0) |
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.. ocv:emember:: Uncompressed_NV12 = (('N'<<24)|('V'<<16)|('1'<<8)|('2')) |
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Y,UV (4:2:0) |
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.. ocv:emember:: Uncompressed_YUYV = (('Y'<<24)|('U'<<16)|('Y'<<8)|('V')) |
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YUYV/YUY2 (4:2:2) |
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.. ocv:emember:: Uncompressed_UYVY = (('U'<<24)|('Y'<<16)|('V'<<8)|('Y')) |
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UYVY (4:2:2) |
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cudacodec::ChromaFormat |
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----------------------- |
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Chroma formats supported by :ocv:class:`cudacodec::VideoReader` . |
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.. ocv:enum:: cudacodec::ChromaFormat |
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.. ocv:emember:: Monochrome = 0 |
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.. ocv:emember:: YUV420 |
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.. ocv:emember:: YUV422 |
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.. ocv:emember:: YUV444 |
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cudacodec::FormatInfo |
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--------------------- |
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.. ocv:struct:: cudacodec::FormatInfo |
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Struct providing information about video file format. :: |
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struct FormatInfo |
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{ |
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Codec codec; |
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ChromaFormat chromaFormat; |
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int width; |
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int height; |
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}; |
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cudacodec::createVideoReader |
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---------------------------- |
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Creates video reader. |
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.. ocv:function:: Ptr<VideoReader> cudacodec::createVideoReader(const String& filename) |
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.. ocv:function:: Ptr<VideoReader> cudacodec::createVideoReader(const Ptr<RawVideoSource>& source) |
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:param filename: Name of the input video file. |
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:param source: RAW video source implemented by user. |
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FFMPEG is used to read videos. User can implement own demultiplexing with :ocv:class:`cudacodec::RawVideoSource` . |
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cudacodec::RawVideoSource |
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------------------------- |
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.. ocv:class:: cudacodec::RawVideoSource |
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Interface for video demultiplexing. :: |
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class RawVideoSource |
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{ |
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public: |
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virtual ~RawVideoSource() {} |
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virtual bool getNextPacket(unsigned char** data, int* size, bool* endOfFile) = 0; |
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virtual FormatInfo format() const = 0; |
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}; |
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User can implement own demultiplexing by implementing this interface. |
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cudacodec::RawVideoSource::getNextPacket |
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Returns next packet with RAW video frame. |
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.. ocv:function:: bool cudacodec::VideoSource::getNextPacket(unsigned char** data, int* size, bool* endOfFile) = 0 |
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:param data: Pointer to frame data. |
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:param size: Size in bytes of current frame. |
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:param endOfStream: Indicates that it is end of stream. |
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cudacodec::RawVideoSource::format |
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--------------------------------- |
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Returns information about video file format. |
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.. ocv:function:: virtual FormatInfo cudacodec::RawVideoSource::format() const = 0
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