Initial commit of avi mjpeg decoder
std::streams removed debug code removed whitespaces removed stdint.h added and trailing whitespaces removed trailing whitespaces removed warnings on windows fix warnings on windows fix pt 2 Refactoring performed: AviMjpegStream class introduced. CAP_PROP_FRAME_WIDTH and CAP_PROP_FRAME_HEIGHT properties support added. Windows warnings & uninitialized variable fix Windows warning fix Win32 warning fix
This commit is contained in:
kalistratovag
@@ -552,6 +552,20 @@ static Ptr<IVideoCapture> IVideoCapture_create(int index)
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}
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static Ptr<IVideoCapture> IVideoCapture_create(const String& filename)
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{
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Ptr<IVideoCapture> capture;
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capture = createMotionJpegCapture(filename);
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if (capture && capture->isOpened())
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{
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return capture;
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}
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// failed open a camera
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return Ptr<IVideoCapture>();
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}
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static Ptr<IVideoWriter> IVideoWriter_create(const String& filename, int _fourcc, double fps, Size frameSize, bool isColor)
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{
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Ptr<IVideoWriter> iwriter;
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@@ -582,6 +596,10 @@ VideoCapture::~VideoCapture()
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bool VideoCapture::open(const String& filename)
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{
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if (isOpened()) release();
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icap = IVideoCapture_create(filename);
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if (!icap.empty())
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return true;
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cap.reset(cvCreateFileCapture(filename.c_str()));
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return isOpened();
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}
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@@ -40,13 +40,881 @@
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//M*/
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#include "precomp.hpp"
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#include <deque>
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#include <stdint.h>
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namespace cv
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{
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Ptr<IVideoCapture> createMotionJpegCapture(const String&)
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const uint32_t RIFF_CC = CV_FOURCC('R','I','F','F');
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const uint32_t LIST_CC = CV_FOURCC('L','I','S','T');
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const uint32_t HDRL_CC = CV_FOURCC('h','d','r','l');
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const uint32_t AVIH_CC = CV_FOURCC('a','v','i','h');
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const uint32_t STRL_CC = CV_FOURCC('s','t','r','l');
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const uint32_t STRH_CC = CV_FOURCC('s','t','r','h');
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const uint32_t VIDS_CC = CV_FOURCC('v','i','d','s');
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const uint32_t MJPG_CC = CV_FOURCC('M','J','P','G');
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const uint32_t MOVI_CC = CV_FOURCC('m','o','v','i');
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const uint32_t IDX1_CC = CV_FOURCC('i','d','x','1');
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const uint32_t AVI_CC = CV_FOURCC('A','V','I',' ');
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const uint32_t AVIX_CC = CV_FOURCC('A','V','I','X');
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const uint32_t JUNK_CC = CV_FOURCC('J','U','N','K');
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const uint32_t INFO_CC = CV_FOURCC('I','N','F','O');
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String fourccToString(uint32_t fourcc);
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String fourccToString(uint32_t fourcc)
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{
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return Ptr<IVideoCapture>();
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return format("%c%c%c%c", fourcc & 255, (fourcc >> 8) & 255, (fourcc >> 16) & 255, (fourcc >> 24) & 255);
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}
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#ifndef DWORD
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typedef uint32_t DWORD;
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#endif
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#ifndef WORD
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typedef uint16_t WORD;
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#endif
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#ifndef LONG
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typedef int32_t LONG;
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#endif
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#pragma pack(push, 1)
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struct AviMainHeader
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{
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DWORD dwMicroSecPerFrame; // The period between video frames
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DWORD dwMaxBytesPerSec; // Maximum data rate of the file
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DWORD dwReserved1; // 0
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DWORD dwFlags; // 0x10 AVIF_HASINDEX: The AVI file has an idx1 chunk containing an index at the end of the file.
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DWORD dwTotalFrames; // Field of the main header specifies the total number of frames of data in file.
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DWORD dwInitialFrames; // Is used for interleaved files
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DWORD dwStreams; // Specifies the number of streams in the file.
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DWORD dwSuggestedBufferSize; // Field specifies the suggested buffer size forreading the file
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DWORD dwWidth; // Fields specify the width of the AVIfile in pixels.
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DWORD dwHeight; // Fields specify the height of the AVIfile in pixels.
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DWORD dwReserved[4]; // 0, 0, 0, 0
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};
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struct AviStreamHeader
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{
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uint32_t fccType; // 'vids', 'auds', 'txts'...
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uint32_t fccHandler; // "cvid", "DIB "
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DWORD dwFlags; // 0
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DWORD dwPriority; // 0
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DWORD dwInitialFrames; // 0
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DWORD dwScale; // 1
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DWORD dwRate; // Fps (dwRate - frame rate for video streams)
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DWORD dwStart; // 0
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DWORD dwLength; // Frames number (playing time of AVI file as defined by scale and rate)
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DWORD dwSuggestedBufferSize; // For reading the stream
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DWORD dwQuality; // -1 (encoding quality. If set to -1, drivers use the default quality value)
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DWORD dwSampleSize; // 0 means that each frame is in its own chunk
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struct {
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short int left;
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short int top;
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short int right;
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short int bottom;
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} rcFrame; // If stream has a different size than dwWidth*dwHeight(unused)
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};
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struct AviIndex
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{
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DWORD ckid;
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DWORD dwFlags;
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DWORD dwChunkOffset;
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DWORD dwChunkLength;
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};
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struct BitmapInfoHeader
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{
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DWORD biSize; // Write header size of BITMAPINFO header structure
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LONG biWidth; // width in pixels
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LONG biHeight; // heigth in pixels
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WORD biPlanes; // Number of color planes in which the data is stored
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WORD biBitCount; // Number of bits per pixel
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DWORD biCompression; // Type of compression used (uncompressed: NO_COMPRESSION=0)
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DWORD biSizeImage; // Image Buffer. Quicktime needs 3 bytes also for 8-bit png
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// (biCompression==NO_COMPRESSION)?0:xDim*yDim*bytesPerPixel;
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LONG biXPelsPerMeter; // Horizontal resolution in pixels per meter
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LONG biYPelsPerMeter; // Vertical resolution in pixels per meter
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DWORD biClrUsed; // 256 (color table size; for 8-bit only)
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DWORD biClrImportant; // Specifies that the first x colors of the color table. Are important to the DIB.
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};
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struct RiffChunk
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{
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uint32_t m_four_cc;
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uint32_t m_size;
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};
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struct RiffList
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{
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uint32_t m_riff_or_list_cc;
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uint32_t m_size;
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uint32_t m_list_type_cc;
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};
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#pragma pack(pop)
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class MjpegInputStream
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{
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public:
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MjpegInputStream();
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MjpegInputStream(const String& filename);
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~MjpegInputStream();
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MjpegInputStream& read(char*, uint64_t);
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MjpegInputStream& seekg(uint64_t);
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uint64_t tellg();
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bool isOpened() const;
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bool open(const String& filename);
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void close();
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operator bool();
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private:
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bool m_is_valid;
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FILE* m_f;
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};
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MjpegInputStream::MjpegInputStream(): m_is_valid(false), m_f(0)
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{
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}
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MjpegInputStream::MjpegInputStream(const String& filename): m_is_valid(false), m_f(0)
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{
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open(filename);
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}
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bool MjpegInputStream::isOpened() const
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{
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return m_f != 0;
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}
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bool MjpegInputStream::open(const String& filename)
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{
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close();
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m_f = fopen(filename.c_str(), "rb");
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m_is_valid = isOpened();
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return m_is_valid;
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}
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void MjpegInputStream::close()
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{
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if(isOpened())
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{
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m_is_valid = false;
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fclose(m_f);
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m_f = 0;
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}
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}
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MjpegInputStream& MjpegInputStream::read(char* buf, uint64_t count)
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{
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if(isOpened())
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{
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m_is_valid = (count == fread((void*)buf, 1, (size_t)count, m_f));
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}
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return *this;
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}
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MjpegInputStream& MjpegInputStream::seekg(uint64_t pos)
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{
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m_is_valid = (fseek(m_f, (long)pos, SEEK_SET) == 0);
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return *this;
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}
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uint64_t MjpegInputStream::tellg()
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{
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return ftell(m_f);
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}
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MjpegInputStream::operator bool()
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{
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return m_is_valid;
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}
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MjpegInputStream::~MjpegInputStream()
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{
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close();
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}
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MjpegInputStream& operator >> (MjpegInputStream& is, AviMainHeader& avih);
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MjpegInputStream& operator >> (MjpegInputStream& is, AviStreamHeader& strh);
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MjpegInputStream& operator >> (MjpegInputStream& is, BitmapInfoHeader& bmph);
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MjpegInputStream& operator >> (MjpegInputStream& is, RiffList& riff_list);
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MjpegInputStream& operator >> (MjpegInputStream& is, RiffChunk& riff_chunk);
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MjpegInputStream& operator >> (MjpegInputStream& is, AviIndex& idx1);
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MjpegInputStream& operator >> (MjpegInputStream& is, AviMainHeader& avih)
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{
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is.read((char*)(&avih), sizeof(AviMainHeader));
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return is;
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}
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MjpegInputStream& operator >> (MjpegInputStream& is, AviStreamHeader& strh)
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{
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is.read((char*)(&strh), sizeof(AviStreamHeader));
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return is;
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}
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MjpegInputStream& operator >> (MjpegInputStream& is, BitmapInfoHeader& bmph)
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{
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is.read((char*)(&bmph), sizeof(BitmapInfoHeader));
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return is;
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}
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MjpegInputStream& operator >> (MjpegInputStream& is, RiffList& riff_list)
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{
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is.read((char*)(&riff_list), sizeof(riff_list));
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return is;
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}
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MjpegInputStream& operator >> (MjpegInputStream& is, RiffChunk& riff_chunk)
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{
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is.read((char*)(&riff_chunk), sizeof(riff_chunk));
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return is;
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}
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MjpegInputStream& operator >> (MjpegInputStream& is, AviIndex& idx1)
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{
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is.read((char*)(&idx1), sizeof(idx1));
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return is;
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}
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/*
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AVI struct:
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RIFF ('AVI '
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LIST ('hdrl'
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'avih'(<Main AVI Header>)
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LIST ('strl'
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'strh'(<Stream header>)
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'strf'(<Stream format>)
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[ 'strd'(<Additional header data>) ]
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[ 'strn'(<Stream name>) ]
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[ 'indx'(<Odml index data>) ]
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...
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)
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[LIST ('strl' ...)]
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[LIST ('strl' ...)]
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...
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[LIST ('odml'
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'dmlh'(<ODML header data>)
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...
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)
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]
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...
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)
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[LIST ('INFO' ...)]
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[JUNK]
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LIST ('movi'
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{{xxdb|xxdc|xxpc|xxwb}(<Data>) | LIST ('rec '
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{xxdb|xxdc|xxpc|xxwb}(<Data>)
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{xxdb|xxdc|xxpc|xxwb}(<Data>)
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...
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)
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...
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}
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...
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)
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['idx1' (<AVI Index>) ]
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)
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{xxdb|xxdc|xxpc|xxwb}
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xx - stream number: 00, 01, 02, ...
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db - uncompressed video frame
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dc - commpressed video frame
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pc - palette change
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wb - audio frame
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JUNK section may pad any data section and must be ignored
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*/
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typedef std::deque< std::pair<uint64_t, uint32_t> > frame_list;
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typedef frame_list::iterator frame_iterator;
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//Represents single MJPEG video stream within single AVI/AVIX entry
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//Multiple video streams within single AVI/AVIX entry are not supported
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//ODML index is not supported
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class AviMjpegStream
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{
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public:
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AviMjpegStream();
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//stores founded frames in m_frame_list which be accessed via getFrames
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bool parseAvi(MjpegInputStream& in_str);
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//stores founded frames in in_frame_list. getFrames() would return empty list
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bool parseAvi(MjpegInputStream& in_str, frame_list& in_frame_list);
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size_t getFramesCount();
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frame_list& getFrames();
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uint32_t getWidth();
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uint32_t getHeight();
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double getFps();
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protected:
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bool parseAviWithFrameList(MjpegInputStream& in_str, frame_list& in_frame_list);
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void skipJunk(RiffChunk& chunk, MjpegInputStream& in_str);
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void skipJunk(RiffList& list, MjpegInputStream& in_str);
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bool parseHdrlList(MjpegInputStream& in_str);
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bool parseIndex(MjpegInputStream& in_str, uint32_t index_size, frame_list& in_frame_list);
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bool parseMovi(MjpegInputStream& in_str, frame_list& in_frame_list);
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bool parseStrl(MjpegInputStream& in_str, uint8_t stream_id);
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bool parseInfo(MjpegInputStream& in_str);
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void printError(MjpegInputStream& in_str, RiffList& list, uint32_t expected_fourcc);
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void printError(MjpegInputStream& in_str, RiffChunk& chunk, uint32_t expected_fourcc);
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uint32_t m_stream_id;
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uint64_t m_movi_start;
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uint64_t m_movi_end;
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frame_list m_frame_list;
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uint32_t m_width;
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uint32_t m_height;
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double m_fps;
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bool m_is_indx_present;
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};
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AviMjpegStream::AviMjpegStream(): m_stream_id(0), m_movi_end(0), m_width(0), m_height(0), m_fps(0), m_is_indx_present(false)
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{
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}
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size_t AviMjpegStream::getFramesCount()
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{
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return m_frame_list.size();
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}
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frame_list& AviMjpegStream::getFrames()
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{
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return m_frame_list;
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}
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uint32_t AviMjpegStream::getWidth()
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{
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return m_width;
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}
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uint32_t AviMjpegStream::getHeight()
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{
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return m_height;
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}
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double AviMjpegStream::getFps()
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{
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return m_fps;
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}
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void AviMjpegStream::printError(MjpegInputStream& in_str, RiffList& list, uint32_t expected_fourcc)
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{
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if(!in_str)
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{
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fprintf(stderr, "Unexpected end of file while searching for %s list\n", fourccToString(expected_fourcc).c_str());
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}
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else if(list.m_riff_or_list_cc != LIST_CC)
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{
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fprintf(stderr, "Unexpected element. Expected: %s. Got: %s.\n", fourccToString(LIST_CC).c_str(), fourccToString(list.m_riff_or_list_cc).c_str());
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}
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else
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{
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fprintf(stderr, "Unexpected list type. Expected: %s. Got: %s.\n", fourccToString(expected_fourcc).c_str(), fourccToString(list.m_list_type_cc).c_str());
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}
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}
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void AviMjpegStream::printError(MjpegInputStream& in_str, RiffChunk& chunk, uint32_t expected_fourcc)
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{
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if(!in_str)
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{
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fprintf(stderr, "Unexpected end of file while searching for %s chunk\n", fourccToString(expected_fourcc).c_str());
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}
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else
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{
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fprintf(stderr, "Unexpected element. Expected: %s. Got: %s.\n", fourccToString(expected_fourcc).c_str(), fourccToString(chunk.m_four_cc).c_str());
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}
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}
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bool AviMjpegStream::parseMovi(MjpegInputStream&, frame_list&)
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{
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//not implemented
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return true;
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}
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bool AviMjpegStream::parseInfo(MjpegInputStream&)
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{
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//not implemented
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return true;
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}
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bool AviMjpegStream::parseIndex(MjpegInputStream& in_str, uint32_t index_size, frame_list& in_frame_list)
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{
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uint64_t index_end = in_str.tellg();
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index_end += index_size;
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bool result = false;
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while(in_str && (in_str.tellg() < index_end))
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{
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AviIndex idx1;
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in_str >> idx1;
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if(idx1.ckid == m_stream_id)
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{
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uint64_t absolute_pos = m_movi_start + idx1.dwChunkOffset;
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if(absolute_pos < m_movi_end)
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{
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in_frame_list.push_back(std::make_pair(absolute_pos, idx1.dwChunkLength));
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}
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else
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{
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//unsupported case
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fprintf(stderr, "Frame offset points outside movi section.\n");
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}
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}
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||||
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result = true;
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}
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return result;
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}
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bool AviMjpegStream::parseStrl(MjpegInputStream& in_str, uint8_t stream_id)
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{
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RiffChunk strh;
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in_str >> strh;
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if(in_str && strh.m_four_cc == STRH_CC)
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||||
{
|
||||
uint64_t next_strl_list = in_str.tellg();
|
||||
next_strl_list += strh.m_size;
|
||||
|
||||
AviStreamHeader strm_hdr;
|
||||
in_str >> strm_hdr;
|
||||
|
||||
if(strm_hdr.fccType == VIDS_CC && strm_hdr.fccHandler == MJPG_CC)
|
||||
{
|
||||
uint8_t first_digit = (stream_id/10) + '0';
|
||||
uint8_t second_digit = (stream_id%10) + '0';
|
||||
|
||||
if(m_stream_id == 0)
|
||||
{
|
||||
m_stream_id = CV_FOURCC(first_digit, second_digit, 'd', 'c');
|
||||
m_fps = double(strm_hdr.dwRate)/strm_hdr.dwScale;
|
||||
}
|
||||
else
|
||||
{
|
||||
//second mjpeg video stream found which is not supported
|
||||
fprintf(stderr, "More than one video stream found within AVI/AVIX list. Stream %c%cdc would be ignored\n", first_digit, second_digit);
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
void AviMjpegStream::skipJunk(RiffChunk& chunk, MjpegInputStream& in_str)
|
||||
{
|
||||
if(chunk.m_four_cc == JUNK_CC)
|
||||
{
|
||||
in_str.seekg(in_str.tellg() + chunk.m_size);
|
||||
in_str >> chunk;
|
||||
}
|
||||
}
|
||||
|
||||
void AviMjpegStream::skipJunk(RiffList& list, MjpegInputStream& in_str)
|
||||
{
|
||||
if(list.m_riff_or_list_cc == JUNK_CC)
|
||||
{
|
||||
//JUNK chunk is 4 bytes less than LIST
|
||||
in_str.seekg(in_str.tellg() + list.m_size - 4);
|
||||
in_str >> list;
|
||||
}
|
||||
}
|
||||
|
||||
bool AviMjpegStream::parseHdrlList(MjpegInputStream& in_str)
|
||||
{
|
||||
bool result = false;
|
||||
|
||||
RiffChunk avih;
|
||||
in_str >> avih;
|
||||
|
||||
if(in_str && avih.m_four_cc == AVIH_CC)
|
||||
{
|
||||
uint64_t next_strl_list = in_str.tellg();
|
||||
next_strl_list += avih.m_size;
|
||||
|
||||
AviMainHeader avi_hdr;
|
||||
in_str >> avi_hdr;
|
||||
|
||||
if(in_str)
|
||||
{
|
||||
m_is_indx_present = ((avi_hdr.dwFlags & 0x10) != 0);
|
||||
DWORD number_of_streams = avi_hdr.dwStreams;
|
||||
m_width = avi_hdr.dwWidth;
|
||||
m_height = avi_hdr.dwWidth;
|
||||
|
||||
//the number of strl lists must be equal to number of streams specified in main avi header
|
||||
for(DWORD i = 0; i < number_of_streams; ++i)
|
||||
{
|
||||
in_str.seekg(next_strl_list);
|
||||
RiffList strl_list;
|
||||
in_str >> strl_list;
|
||||
|
||||
if( in_str && strl_list.m_riff_or_list_cc == LIST_CC && strl_list.m_list_type_cc == STRL_CC )
|
||||
{
|
||||
next_strl_list = in_str.tellg();
|
||||
//RiffList::m_size includes fourCC field which we have already read
|
||||
next_strl_list += (strl_list.m_size - 4);
|
||||
|
||||
result = parseStrl(in_str, (uint8_t)i);
|
||||
}
|
||||
else
|
||||
{
|
||||
printError(in_str, strl_list, STRL_CC);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
printError(in_str, avih, AVIH_CC);
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
bool AviMjpegStream::parseAviWithFrameList(MjpegInputStream& in_str, frame_list& in_frame_list)
|
||||
{
|
||||
RiffList hdrl_list;
|
||||
in_str >> hdrl_list;
|
||||
|
||||
if( in_str && hdrl_list.m_riff_or_list_cc == LIST_CC && hdrl_list.m_list_type_cc == HDRL_CC )
|
||||
{
|
||||
uint64_t next_list = in_str.tellg();
|
||||
//RiffList::m_size includes fourCC field which we have already read
|
||||
next_list += (hdrl_list.m_size - 4);
|
||||
//parseHdrlList sets m_is_indx_present flag which would be used later
|
||||
if(parseHdrlList(in_str))
|
||||
{
|
||||
in_str.seekg(next_list);
|
||||
|
||||
RiffList some_list;
|
||||
in_str >> some_list;
|
||||
|
||||
//an optional section INFO
|
||||
if(in_str && some_list.m_riff_or_list_cc == LIST_CC && some_list.m_list_type_cc == INFO_CC)
|
||||
{
|
||||
next_list = in_str.tellg();
|
||||
//RiffList::m_size includes fourCC field which we have already read
|
||||
next_list += (some_list.m_size - 4);
|
||||
parseInfo(in_str);
|
||||
|
||||
in_str.seekg(next_list);
|
||||
in_str >> some_list;
|
||||
}
|
||||
|
||||
//an optional section JUNK
|
||||
skipJunk(some_list, in_str);
|
||||
|
||||
//we are expecting to find here movi list. Must present in avi
|
||||
if(in_str && some_list.m_riff_or_list_cc == LIST_CC && some_list.m_list_type_cc == MOVI_CC)
|
||||
{
|
||||
bool is_index_found = false;
|
||||
|
||||
m_movi_start = in_str.tellg();
|
||||
m_movi_start -= 4;
|
||||
|
||||
m_movi_end = m_movi_start + some_list.m_size;
|
||||
//if m_is_indx_present is set to true we should find index
|
||||
if(m_is_indx_present)
|
||||
{
|
||||
//we are expecting to find index section after movi list
|
||||
uint32_t indx_pos = (uint32_t)m_movi_start + 4;
|
||||
indx_pos += (some_list.m_size - 4);
|
||||
in_str.seekg(indx_pos);
|
||||
|
||||
RiffChunk index_chunk;
|
||||
in_str >> index_chunk;
|
||||
|
||||
if(in_str && index_chunk.m_four_cc == IDX1_CC)
|
||||
{
|
||||
is_index_found = parseIndex(in_str, index_chunk.m_size, in_frame_list);
|
||||
//we are not going anywhere else
|
||||
}
|
||||
else
|
||||
{
|
||||
printError(in_str, index_chunk, IDX1_CC);
|
||||
}
|
||||
}
|
||||
//index not present or we were not able to find it
|
||||
//parsing movi list
|
||||
if(!is_index_found)
|
||||
{
|
||||
//not implemented
|
||||
parseMovi(in_str, in_frame_list);
|
||||
|
||||
fprintf(stderr, "Failed to parse avi: index was not found\n");
|
||||
//we are not going anywhere else
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
printError(in_str, some_list, MOVI_CC);
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
printError(in_str, hdrl_list, HDRL_CC);
|
||||
}
|
||||
|
||||
return in_frame_list.size() > 0;
|
||||
}
|
||||
|
||||
bool AviMjpegStream::parseAvi(MjpegInputStream& in_str, frame_list& in_frame_list)
|
||||
{
|
||||
return parseAviWithFrameList(in_str, in_frame_list);
|
||||
}
|
||||
|
||||
bool AviMjpegStream::parseAvi(MjpegInputStream& in_str)
|
||||
{
|
||||
return parseAviWithFrameList(in_str, m_frame_list);
|
||||
}
|
||||
|
||||
|
||||
class MotionJpegCapture: public IVideoCapture
|
||||
{
|
||||
public:
|
||||
virtual ~MotionJpegCapture();
|
||||
virtual double getProperty(int) const;
|
||||
virtual bool setProperty(int, double);
|
||||
virtual bool grabFrame();
|
||||
virtual bool retrieveFrame(int, OutputArray);
|
||||
virtual bool isOpened() const;
|
||||
virtual int getCaptureDomain() { return CAP_ANY; } // Return the type of the capture object: CAP_VFW, etc...
|
||||
MotionJpegCapture(const String&);
|
||||
|
||||
bool open(const String&);
|
||||
void close();
|
||||
protected:
|
||||
|
||||
bool parseRiff(MjpegInputStream& in_str);
|
||||
|
||||
inline uint64_t getFramePos() const;
|
||||
std::vector<char> readFrame(frame_iterator it);
|
||||
|
||||
MjpegInputStream m_file_stream;
|
||||
bool m_is_first_frame;
|
||||
frame_list m_mjpeg_frames;
|
||||
|
||||
frame_iterator m_frame_iterator;
|
||||
Mat m_current_frame;
|
||||
|
||||
//frame width/height and fps could be different for
|
||||
//each frame/stream. At the moment we suppose that they
|
||||
//stays the same within single avi file.
|
||||
uint32_t m_frame_width;
|
||||
uint32_t m_frame_height;
|
||||
double m_fps;
|
||||
};
|
||||
|
||||
uint64_t MotionJpegCapture::getFramePos() const
|
||||
{
|
||||
if(m_is_first_frame)
|
||||
return 0;
|
||||
|
||||
if(m_frame_iterator == m_mjpeg_frames.end())
|
||||
return m_mjpeg_frames.size();
|
||||
|
||||
return m_frame_iterator - m_mjpeg_frames.begin() + 1;
|
||||
}
|
||||
|
||||
bool MotionJpegCapture::setProperty(int property, double value)
|
||||
{
|
||||
if(property == CAP_PROP_POS_FRAMES)
|
||||
{
|
||||
if(int(value) == 0)
|
||||
{
|
||||
m_is_first_frame = true;
|
||||
m_frame_iterator = m_mjpeg_frames.end();
|
||||
return true;
|
||||
}
|
||||
else if(m_mjpeg_frames.size() > value)
|
||||
{
|
||||
m_frame_iterator = m_mjpeg_frames.begin() + int(value - 1);
|
||||
m_is_first_frame = false;
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
double MotionJpegCapture::getProperty(int property) const
|
||||
{
|
||||
switch(property)
|
||||
{
|
||||
case CAP_PROP_POS_FRAMES:
|
||||
return (double)getFramePos();
|
||||
case CAP_PROP_POS_AVI_RATIO:
|
||||
return double(getFramePos())/m_mjpeg_frames.size();
|
||||
case CAP_PROP_FRAME_WIDTH:
|
||||
return (double)m_frame_width;
|
||||
case CAP_PROP_FRAME_HEIGHT:
|
||||
return (double)m_frame_height;
|
||||
case CAP_PROP_FPS:
|
||||
return m_fps;
|
||||
case CAP_PROP_FOURCC:
|
||||
return (double)CV_FOURCC('M','J','P','G');
|
||||
case CAP_PROP_FRAME_COUNT:
|
||||
return (double)m_mjpeg_frames.size();
|
||||
case CAP_PROP_FORMAT:
|
||||
return 0;
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
std::vector<char> MotionJpegCapture::readFrame(frame_iterator it)
|
||||
{
|
||||
m_file_stream.seekg(it->first);
|
||||
|
||||
RiffChunk chunk;
|
||||
m_file_stream >> chunk;
|
||||
|
||||
std::vector<char> result;
|
||||
|
||||
result.reserve(chunk.m_size);
|
||||
result.resize(chunk.m_size);
|
||||
|
||||
m_file_stream.read(result.data(), chunk.m_size);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
bool MotionJpegCapture::grabFrame()
|
||||
{
|
||||
if(isOpened())
|
||||
{
|
||||
if(m_is_first_frame)
|
||||
{
|
||||
m_is_first_frame = false;
|
||||
m_frame_iterator = m_mjpeg_frames.begin();
|
||||
}
|
||||
else
|
||||
{
|
||||
++m_frame_iterator;
|
||||
}
|
||||
}
|
||||
|
||||
return m_frame_iterator != m_mjpeg_frames.end();
|
||||
}
|
||||
|
||||
bool MotionJpegCapture::retrieveFrame(int, OutputArray output_frame)
|
||||
{
|
||||
if(m_frame_iterator != m_mjpeg_frames.end())
|
||||
{
|
||||
std::vector<char> data = readFrame(m_frame_iterator);
|
||||
|
||||
if(data.size())
|
||||
{
|
||||
m_current_frame = imdecode(data, CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_COLOR);
|
||||
}
|
||||
|
||||
m_current_frame.copyTo(output_frame);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
MotionJpegCapture::~MotionJpegCapture()
|
||||
{
|
||||
close();
|
||||
}
|
||||
|
||||
MotionJpegCapture::MotionJpegCapture(const String& filename)
|
||||
{
|
||||
open(filename);
|
||||
}
|
||||
|
||||
bool MotionJpegCapture::isOpened() const
|
||||
{
|
||||
return m_mjpeg_frames.size() > 0;
|
||||
}
|
||||
|
||||
void MotionJpegCapture::close()
|
||||
{
|
||||
m_file_stream.close();
|
||||
m_frame_iterator = m_mjpeg_frames.end();
|
||||
}
|
||||
|
||||
bool MotionJpegCapture::open(const String& filename)
|
||||
{
|
||||
close();
|
||||
|
||||
m_file_stream.open(filename);
|
||||
|
||||
m_frame_iterator = m_mjpeg_frames.end();
|
||||
m_is_first_frame = true;
|
||||
|
||||
if(!parseRiff(m_file_stream))
|
||||
{
|
||||
close();
|
||||
}
|
||||
|
||||
return isOpened();
|
||||
}
|
||||
|
||||
|
||||
bool MotionJpegCapture::parseRiff(MjpegInputStream& in_str)
|
||||
{
|
||||
bool result = false;
|
||||
while(in_str)
|
||||
{
|
||||
RiffList riff_list;
|
||||
|
||||
in_str >> riff_list;
|
||||
|
||||
if( in_str && riff_list.m_riff_or_list_cc == RIFF_CC &&
|
||||
((riff_list.m_list_type_cc == AVI_CC) | (riff_list.m_list_type_cc == AVIX_CC)) )
|
||||
{
|
||||
uint64_t next_riff = in_str.tellg();
|
||||
//RiffList::m_size includes fourCC field which we have already read
|
||||
next_riff += (riff_list.m_size - 4);
|
||||
|
||||
AviMjpegStream mjpeg_video_stream;
|
||||
bool is_parsed = mjpeg_video_stream.parseAvi(in_str, m_mjpeg_frames);
|
||||
result = result || is_parsed;
|
||||
|
||||
if(is_parsed)
|
||||
{
|
||||
m_frame_width = mjpeg_video_stream.getWidth();
|
||||
m_frame_height = mjpeg_video_stream.getHeight();
|
||||
m_fps = mjpeg_video_stream.getFps();
|
||||
}
|
||||
|
||||
in_str.seekg(next_riff);
|
||||
}
|
||||
else
|
||||
{
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
Ptr<IVideoCapture> createMotionJpegCapture(const String& filename)
|
||||
{
|
||||
Ptr<MotionJpegCapture> mjdecoder(new MotionJpegCapture(filename));
|
||||
if( mjdecoder->isOpened() )
|
||||
return mjdecoder;
|
||||
return Ptr<MotionJpegCapture>();
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user