MLECO-1252 ASR sample application using the public ArmNN C++ API.

Change-Id: I98cd505b8772a8c8fa88308121bc94135bb45068
Signed-off-by: Éanna Ó Catháin <eanna.ocathain@arm.com>

1 files changed, 108 insertions, 0 deletions

diff --git a/samples/common/include/CVUtils/CvVideoFrameReader.hpp b/samples/common/include/CVUtils/CvVideoFrameReader.hpp
new file mode 100644
index 0000000000..96d94f4079
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+++ b/samples/common/include/CVUtils/CvVideoFrameReader.hpp
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+//
+// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+
+#include "IFrameReader.hpp"
+#include <opencv2/opencv.hpp>
+
+namespace common
+{
+
+class CvVideoFrameReader :
+    public IFrameReader<cv::Mat>
+{
+public:
+    /**
+     * @brief Default constructor.
+     *
+     * Underlying open cv video capture object will be instantiated.
+     */
+    CvVideoFrameReader() = default;
+
+    ~CvVideoFrameReader() override = default;
+
+    /**
+     *@brief Initialises reader to capture frames from video file.
+     *
+     * @param source path to the video file or image sequence.
+     *
+     * @throws std::runtime_error if init failed
+     */
+    void Init(const std::string& source);
+
+    std::shared_ptr <cv::Mat> ReadFrame() override;
+
+    bool IsExhausted(const std::shared_ptr <cv::Mat>& frame) const override;
+
+    /**
+     * Returns effective video frame width supported by the source/set by the user.
+     * Must be called after Init method.
+     * @return frame width
+     */
+    int GetSourceWidth() const;
+
+    /**
+     * Returns effective video frame height supported by the source/set by the user.
+     * Must be called after Init method.
+     * @return frame height
+     */
+    int GetSourceHeight() const;
+
+    /**
+     * Returns effective fps value supported by the source/set by the user.
+     * @return fps value
+     */
+    double GetSourceFps() const;
+
+    /**
+     * Will query OpenCV to convert images to RGB
+     * Copy is actually default behaviour, but the set function needs to be called
+     * in order to know whether OpenCV supports conversion from our source format.
+     * @return boolean,
+     *     true:  OpenCV returns RGB
+     *     false: OpenCV returns the fourcc format from GetSourceEncoding
+     */
+    bool ConvertToRGB();
+
+    /**
+     * Returns 4-character code of codec.
+     * @return codec name
+     */
+    std::string GetSourceEncoding() const;
+
+   /**
+    * Get the fourcc int from its string name.
+    * @return codec int
+    */
+    int GetSourceEncodingInt() const;
+
+    int GetFrameCount() const;
+
+private:
+    cv::VideoCapture m_capture;
+
+    void CheckIsOpen(const std::string& source);
+};
+
+class CvVideoFrameReaderRgbWrapper :
+        public IFrameReader<cv::Mat>
+{
+public:
+    CvVideoFrameReaderRgbWrapper() = delete;
+    CvVideoFrameReaderRgbWrapper(const CvVideoFrameReaderRgbWrapper& o) = delete;
+    CvVideoFrameReaderRgbWrapper(CvVideoFrameReaderRgbWrapper&& o) = delete;
+
+    CvVideoFrameReaderRgbWrapper(std::unique_ptr<common::CvVideoFrameReader> reader);
+
+    std::shared_ptr<cv::Mat> ReadFrame() override;
+
+    bool IsExhausted(const std::shared_ptr<cv::Mat>& frame) const override;
+
+private:
+    std::unique_ptr<common::CvVideoFrameReader> m_reader;
+};
+
+}// namespace common
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