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ReaderBase.h
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ReaderBase.h
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/**
* @file
* @brief Header file for ReaderBase class
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @ref License
*/
/* LICENSE
*
* Copyright (c) 2008-2019 OpenShot Studios, LLC
* <http://www.openshotstudios.com/>. This file is part of
* OpenShot Library (libopenshot), an open-source project dedicated to
* delivering high quality video editing and animation solutions to the
* world. For more information visit <http://www.openshot.org/>.
*
* OpenShot Library (libopenshot) is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef OPENSHOT_READER_BASE_H
#define OPENSHOT_READER_BASE_H
#include <iostream>
#include <iomanip>
#include <memory>
#include <cstdlib>
#include <sstream>
#include "CacheMemory.h"
#include "ChannelLayouts.h"
#include "ClipBase.h"
#include "Fraction.h"
#include "Frame.h"
#include "Json.h"
#include "ZmqLogger.h"
#include <QString>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QGraphicsPixmapItem>
#include <QPixmap>
namespace openshot
{
/**
* @brief This struct contains info about a media file, such as height, width, frames per second, etc...
*
* Each derived class of ReaderBase is responsible for updating this struct to reflect accurate information
* about the streams.
*/
struct ReaderInfo
{
bool has_video; ///< Determines if this file has a video stream
bool has_audio; ///< Determines if this file has an audio stream
bool has_single_image; ///< Determines if this file only contains a single image
float duration; ///< Length of time (in seconds)
int64_t file_size; ///< Size of file (in bytes)
int height; ///< The height of the video (in pixels)
int width; ///< The width of the video (in pixesl)
int pixel_format; ///< The pixel format (i.e. YUV420P, RGB24, etc...)
openshot::Fraction fps; ///< Frames per second, as a fraction (i.e. 24/1 = 24 fps)
int video_bit_rate; ///< The bit rate of the video stream (in bytes)
openshot::Fraction pixel_ratio; ///< The pixel ratio of the video stream as a fraction (i.e. some pixels are not square)
openshot::Fraction display_ratio; ///< The ratio of width to height of the video stream (i.e. 640x480 has a ratio of 4/3)
std::string vcodec; ///< The name of the video codec used to encode / decode the video stream
int64_t video_length; ///< The number of frames in the video stream
int video_stream_index; ///< The index of the video stream
openshot::Fraction video_timebase; ///< The video timebase determines how long each frame stays on the screen
bool interlaced_frame; // Are the contents of this frame interlaced
bool top_field_first; // Which interlaced field should be displayed first
std::string acodec; ///< The name of the audio codec used to encode / decode the video stream
int audio_bit_rate; ///< The bit rate of the audio stream (in bytes)
int sample_rate; ///< The number of audio samples per second (44100 is a common sample rate)
int channels; ///< The number of audio channels used in the audio stream
openshot::ChannelLayout channel_layout; ///< The channel layout (mono, stereo, 5 point surround, etc...)
int audio_stream_index; ///< The index of the audio stream
openshot::Fraction audio_timebase; ///< The audio timebase determines how long each audio packet should be played
std::map<std::string, std::string> metadata; ///< An optional map/dictionary of metadata for this reader
};
/**
* @brief This abstract class is the base class, used by all readers in libopenshot.
*
* Readers are types of classes that read video, audio, and image files, and
* return openshot::Frame objects. The only requirements for a 'reader', are to
* derive from this base class, implement the GetFrame method, and populate ReaderInfo.
*/
class ReaderBase
{
protected:
/// Section lock for multiple threads
juce::CriticalSection getFrameCriticalSection;
juce::CriticalSection processingCriticalSection;
openshot::ClipBase* clip; ///< Pointer to the parent clip instance (if any)
public:
/// Constructor for the base reader, where many things are initialized.
ReaderBase();
/// Information about the current media file
openshot::ReaderInfo info;
/// Parent clip object of this reader (which can be unparented and NULL)
openshot::ClipBase* ParentClip();
/// Set parent clip object of this reader
void ParentClip(openshot::ClipBase* new_clip);
/// Close the reader (and any resources it was consuming)
virtual void Close() = 0;
/// Display file information in the standard output stream (stdout)
void DisplayInfo();
/// Get the cache object used by this reader (note: not all readers use cache)
virtual openshot::CacheBase* GetCache() = 0;
/// This method is required for all derived classes of ReaderBase, and returns the
/// openshot::Frame object, which contains the image and audio information for that
/// frame of video.
///
/// @returns The requested frame of video
/// @param[in] number The frame number that is requested.
virtual std::shared_ptr<openshot::Frame> GetFrame(int64_t number) = 0;
/// Determine if reader is open or closed
virtual bool IsOpen() = 0;
/// Return the type name of the class
virtual std::string Name() = 0;
/// Get and Set JSON methods
virtual std::string Json() const = 0; ///< Generate JSON string of this object
virtual void SetJson(const std::string value) = 0; ///< Load JSON string into this object
virtual Json::Value JsonValue() const = 0; ///< Generate Json::Value for this object
virtual void SetJsonValue(const Json::Value root) = 0; ///< Load Json::Value into this object
/// Open the reader (and start consuming resources, such as images or video files)
virtual void Open() = 0;
virtual ~ReaderBase() = default;
};
}
#endif