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Added the base class for the FileWriter.

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This commit is contained in:
Jonathan Thomas
2012-07-09 15:18:24 -05:00
parent ca6499b878
commit 902b2ff8cd
4 changed files with 125 additions and 3 deletions
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79
include/FileWriterBase.h Normal file
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@@ -0,0 +1,79 @@
#ifndef OPENSHOT_FILE_WRITER_BASE_H
#define OPENSHOT_FILE_WRITER_BASE_H
/**
* \file
* \brief Header file for FileWriterBase class
* \author Copyright (c) 2011 Jonathan Thomas
*/
#include <iostream>
#include <iomanip>
#include "Fraction.h"
#include "Frame.h"
using namespace std;
namespace openshot
{
/**
* \brief This struct contains info about encoding a media file, such as height, width, frames per second, etc...
*
* Each derived class of FileWriterBase is responsible for updating this struct to reflect accurate information
* about the streams.
*/
struct WriterInfo
{
bool has_video; ///< Determines if this file has a video stream
bool has_audio; ///< Determines if this file has an audio stream
float duration; ///< Length of time (in seconds)
int 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...)
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)
Fraction pixel_ratio; ///< The pixel ratio of the video stream as a fraction (i.e. some pixels are not square)
Fraction display_ratio; ///< The ratio of width to height of the video stream (i.e. 640x480 has a ratio of 4/3)
string vcodec; ///< The name of the video codec used to encode / decode the video stream
long int video_length; ///< The number of frames in the video stream
int video_stream_index; ///< The index of the video stream
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
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
int audio_stream_index; ///< The index of the audio stream
Fraction audio_timebase; ///< The audio timebase determines how long each audio packet should be played
};
/**
* \brief This abstract class is the base class, used by writers. Writers are types of classes that encode
* video, audio, and image files.
*
* The only requirements for a 'writer', are to derive from this base class, and implement the
* WriteFrame method.
*/
class FileWriterBase
{
public:
/// Information about the current media file
WriterInfo info;
/// This method is required for all derived classes of FileReaderBase, and return 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 void WriteFrame(Frame frame);
/// Display file information in the standard output stream (stdout)
void DisplayInfo();
};
}
#endif

1
src/CMakeLists.txt
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@@ -41,6 +41,7 @@ add_library(openshot SHARED
Coordinate.cpp
FFmpegReader.cpp
FileReaderBase.cpp
FileWriterBase.cpp
Fraction.cpp
Frame.cpp
FrameMapper.cpp

42
src/FileWriterBase.cpp Normal file
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@@ -0,0 +1,42 @@
#include "../include/FileWriterBase.h"
using namespace openshot;
// Display file information
void FileWriterBase::DisplayInfo() {
cout << fixed << setprecision(2) << boolalpha;
cout << "----------------------------" << endl;
cout << "----- File Information -----" << endl;
cout << "----------------------------" << endl;
cout << "--> Has Video: " << info.has_video << endl;
cout << "--> Has Audio: " << info.has_audio << endl;
cout << "--> Duration: " << info.duration << " Seconds" << endl;
cout << "--> File Size: " << double(info.file_size) / 1024 / 1024 << " MB" << endl;
cout << "----------------------------" << endl;
cout << "----- Video Attributes -----" << endl;
cout << "----------------------------" << endl;
cout << "--> Width: " << info.width << endl;
cout << "--> Height: " << info.height << endl;
cout << "--> Pixel Format: " << info.pixel_format << endl;
cout << "--> Frames Per Second: " << info.fps.ToDouble() << " (" << info.fps.num << "/" << info.fps.den << ")" << endl;
cout << "--> Video Bit Rate: " << info.video_bit_rate/1000 << " kb/s" << endl;
cout << "--> Pixel Ratio: " << info.pixel_ratio.ToDouble() << " (" << info.pixel_ratio.num << "/" << info.pixel_ratio.den << ")" << endl;
cout << "--> Display Aspect Ratio: " << info.display_ratio.ToDouble() << " (" << info.display_ratio.num << "/" << info.display_ratio.den << ")" << endl;
cout << "--> Video Codec: " << info.vcodec << endl;
cout << "--> Video Length: " << info.video_length << " Frames" << endl;
cout << "--> Video Stream Index: " << info.video_stream_index << endl;
cout << "--> Video Timebase: " << info.video_timebase.ToDouble() << " (" << info.video_timebase.num << "/" << info.video_timebase.den << ")" << endl;
cout << "--> Interlaced: " << info.interlaced_frame << endl;
cout << "--> Interlaced: Top Field First: " << info.top_field_first << endl;
cout << "----------------------------" << endl;
cout << "----- Audio Attributes -----" << endl;
cout << "----------------------------" << endl;
cout << "--> Audio Codec: " << info.acodec << endl;
cout << "--> Audio Bit Rate: " << info.audio_bit_rate/1000 << " kb/s" << endl;
cout << "--> Sample Rate: " << info.sample_rate << " Hz" << endl;
cout << "--> # of Channels: " << info.channels << endl;
cout << "--> Audio Stream Index: " << info.audio_stream_index << endl;
cout << "--> Audio Timebase: " << info.audio_timebase.ToDouble() << " (" << info.audio_timebase.num << "/" << info.audio_timebase.den << ")" << endl;
cout << "----------------------------" << endl;
}

6
src/Main.cpp
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@@ -15,8 +15,8 @@ int main()
{
// openshot::FFmpegReader r("/home/jonathan/Apps/libopenshot/src/examples/test.mp4");
// openshot::FFmpegReader r("/home/jonathan/Apps/libopenshot/src/examples/test1.mp4");
// openshot::FFmpegReader r("/home/jonathan/Apps/libopenshot/src/examples/piano.wav");
openshot::FFmpegReader r("/home/jonathan/Videos/sintel-1024-stereo.mp4");
openshot::FFmpegReader r("/home/jonathan/apps/libopenshot/src/examples/piano.wav");
// openshot::FFmpegReader r("/home/jonathan/Videos/sintel-1024-stereo.mp4");
// openshot::FFmpegReader r("/home/jonathan/Videos/00001.mts");
// openshot::FFmpegReader r("/home/jonathan/Videos/sintel_trailer-720p.mp4");
// openshot::FFmpegReader r("/home/jonathan/Aptana Studio Workspace/OpenShotLibrary/src/examples/piano.wav");
@@ -31,7 +31,7 @@ int main()
for (int repeat = 0; repeat <= 10; repeat++)
{
cout << "----------- REPEAT READER " << repeat << " ---------------" << endl;
for (int frame = 300; frame <= 400; frame++)
for (int frame = 1; frame <= 400; frame++)
{
Frame f = r.GetFrame(frame);
f.Play();