Hi there,
I have managed to dig up an old article about video integration using SFML and FFMPEG.
Unfortunately it has been removed from the SFML wiki.
I have managed to update it to Latest SFML 2.3.2 and FFMPEG 3 code. Here are the source codes:
//----- Video.h File -----------------------------------------------------------------------------------------------------------
#ifndef VIDEO_H
#define VIDEO_H
#include <SFML/Graphics.hpp>
#include <iostream>
#include <string>
using namespace std;
typedef unsigned int nuint;
#define __STDC_CONSTANT_MACROS
extern "C"
{
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswscale/swscale.h>
}
class Video
{
private:
//Variables
sf::Texture m_Texture;
bool m_bVideoLoaded;
bool m_bImageNeedsUpdate;
AVFormatContext *m_pFormatCtx;
sf::Uint8 m_iVideoStream;
sf::Uint32 m_iFrameSize;
AVCodecContext *m_pCodecCtx;
AVFrame *m_pFrame;
AVFrame *m_pFrameRGB;
sf::Uint8 *m_pBuffer;
AVPacket m_Packet;
AVCodec *m_pCodec;
SwsContext *img_convert_ctx;
string m_sFilename;
float m_fSecondsPerFrame;
float m_fTimePassedSinceLastFrameUpdate;
//Functions
void UpdateImage();
void LoadNextFrame();
public:
Video();
explicit Video(const string& filename = "");
bool LoadFromFile(const string& filename);
void Update(float time);
sf::Vector2i Size() const { return sf::Vector2i(GetWidth(), GetHeight()); }
nuint GetWidth() const { return m_pCodecCtx->width; }
nuint GetHeight() const { return m_pCodecCtx->height; }
float GetFrameRate() const { return 1/m_fSecondsPerFrame; }
operator const sf::Texture&() const {return m_Texture;}
~Video();
sf::Color GetPixel(nuint x, nuint y) const;
void CloseVideo();
private:
Video(const Video& rhs);
Video& operator=(const Video& rhs);
};
#endif // VIDEO_H
//----- END OF VIDEO.H FILE ----------------------------------------------------------------------------------------------------
//----- START OF VIDEO.CPP FILE -----------------------------------------------------------------------------------------------
#include "video.h"
Video::Video() : m_Texture(),
m_bVideoLoaded(false),
m_bImageNeedsUpdate(false),
m_pFormatCtx(NULL),
m_iVideoStream(0),
m_iFrameSize(0),
m_pCodecCtx(NULL),
m_pFrame(NULL),
m_pFrameRGB(NULL),
m_pBuffer(NULL),
m_Packet(),
m_pCodec(NULL),
img_convert_ctx(NULL),
m_sFilename(""),
m_fSecondsPerFrame(0),
m_fTimePassedSinceLastFrameUpdate(0)
{
av_register_all();
}
Video::Video(const string& filename) : m_Texture(),
m_bVideoLoaded(false),
m_bImageNeedsUpdate(false),
m_pFormatCtx(NULL),
m_iVideoStream(0),
m_iFrameSize(0),
m_pCodecCtx(NULL),
m_pFrame(NULL),
m_pFrameRGB(NULL),
m_pBuffer(NULL),
m_Packet(),
m_pCodec(NULL),
img_convert_ctx(NULL),
m_sFilename(""),
m_fSecondsPerFrame(0),
m_fTimePassedSinceLastFrameUpdate(0)
{
av_register_all();
if (!filename.empty())
{
if (!LoadFromFile(filename))
{
cout << "Could not load video!" << endl; //Probably should throw exception.
}
}
}
bool Video::LoadFromFile(const string& filename)
{
CloseVideo();
m_sFilename = filename;
const char * const file = m_sFilename.c_str();
if(avformat_open_input(&m_pFormatCtx, file, NULL,NULL) != 0)
{
cout << "Unexisting file!" << endl;;
return false;
}
if(avformat_find_stream_info(m_pFormatCtx,NULL) < 0)
{
cout << "Couldn't find stream information!" << endl;
return false;
}
av_dump_format(m_pFormatCtx, 0, file, 0);
m_iVideoStream = -1;
for(nuint i = 0; i < m_pFormatCtx->nb_streams; i++)
{
if(m_pFormatCtx->streams[i]->codec->coder_type == AVMEDIA_TYPE_VIDEO)
{
m_iVideoStream = i;
break;
}
}
if(m_iVideoStream == -1)
return false;
m_pCodecCtx = m_pFormatCtx->streams[m_iVideoStream]->codec;
m_pCodec = avcodec_find_decoder(m_pCodecCtx->codec_id);
AVRational r = m_pFormatCtx->streams[m_iVideoStream]->avg_frame_rate;
AVRational r2 = m_pFormatCtx->streams[m_iVideoStream]->r_frame_rate;
if ((!r.num || !r.den) &&
(!r2.num || !r2.den))
{
std::cerr << "Video_video::Initialize() - unable to get the video frame rate. Using 25 fps." << std::endl;
m_fSecondsPerFrame = 1.f / 25;
}
else
{
if (r.num && r.den)
m_fSecondsPerFrame = 1.f/((float)r.num / r.den);
else
m_fSecondsPerFrame = 1.f/((float)r2.num / r2.den);
}
if(m_pCodec == NULL)
{
cout << "Unsupported codec!" << endl;
return false;
}
if(avcodec_open2(m_pCodecCtx, m_pCodec,NULL) < 0)
{
cout << "Could not open Codec Context" << endl;
return false;
}
m_iFrameSize = m_pCodecCtx->width * m_pCodecCtx->height * 3;
m_pFrame = av_frame_alloc();
m_pFrameRGB = av_frame_alloc();
if(m_pFrameRGB == NULL || m_pFrame == NULL)
{
cout << "Error allocating frame" << endl;
return false;
}
int numBytes = avpicture_get_size(AV_PIX_FMT_RGBA, m_pCodecCtx->width, m_pCodecCtx->height);
m_pBuffer = (sf::Uint8 *)av_malloc(numBytes * sizeof(sf::Uint8));
avpicture_fill((AVPicture *)m_pFrameRGB, m_pBuffer, AV_PIX_FMT_RGBA,
m_pCodecCtx->width, m_pCodecCtx->height);
img_convert_ctx = sws_getContext(m_pCodecCtx->width, m_pCodecCtx->height,
m_pCodecCtx->pix_fmt,
m_pCodecCtx->width, m_pCodecCtx->height,
AV_PIX_FMT_RGBA, SWS_FAST_BILINEAR,
NULL, NULL, NULL);
m_bVideoLoaded = true;
m_bImageNeedsUpdate = true;
m_Texture.create(GetWidth(), GetHeight());
Update(10000);
return true;
} //Load From File
void Video::Update(float time)
{
if (m_bVideoLoaded)
{
m_fTimePassedSinceLastFrameUpdate += time;
UpdateImage();
if (m_fTimePassedSinceLastFrameUpdate > m_fSecondsPerFrame)
{
m_fTimePassedSinceLastFrameUpdate = 0;
LoadNextFrame();
}
}
}
void Video::LoadNextFrame()
{
do
{
av_free_packet(&m_Packet);
int result = av_read_frame(m_pFormatCtx, &m_Packet);
if (result < 0)
{
CloseVideo();
LoadFromFile(m_sFilename);
m_fTimePassedSinceLastFrameUpdate = 0;
return;
}
} while (m_Packet.stream_index != m_iVideoStream);
int frameFinished = 0;
avcodec_decode_video2(m_pCodecCtx, m_pFrame, &frameFinished, &m_Packet);
if (frameFinished)
{
sws_scale(img_convert_ctx, m_pFrame->data, m_pFrame->linesize,
0, m_pCodecCtx->height, m_pFrameRGB->data, m_pFrameRGB->linesize);
m_bImageNeedsUpdate = true;
}
}
sf::Color Video::GetPixel(nuint x, nuint y) const
{
nuint i = 3*(y*GetWidth()+x);
sf::Uint8 red = m_pFrameRGB->data[0][i];
sf::Uint8 green = m_pFrameRGB->data[0][i+1];
sf::Uint8 blue = m_pFrameRGB->data[0][i+2];
return sf::Color(red,green,blue,255);
}
void Video::UpdateImage()
{
if (m_bImageNeedsUpdate)
{
m_Texture.update(m_pBuffer);
m_bImageNeedsUpdate = false;
}
}
void Video::CloseVideo()
{
if (m_bVideoLoaded)
{
av_free_packet(&m_Packet);
av_free(m_pBuffer);
av_free(m_pFrameRGB);
av_free(m_pFrame);
avcodec_close(m_pCodecCtx);
avformat_close_input(&m_pFormatCtx);
sws_freeContext(img_convert_ctx);
m_bVideoLoaded = false;
m_bImageNeedsUpdate = false;
}
}
Video::~Video()
{
CloseVideo();
}
//----- END OF VIDEO.CPP FILE-------------------------------------------------------------------------------------------------
//----- MAIN.CPP FILE ------------------------------------------------------------------------------------------------------------
int main(int argc, char *argv[])
{
Video viddy("C:/Qt/sample.avi");
sf::Sprite sprite(viddy);
int w = viddy.GetWidth();
int h = viddy.GetHeight();
sf::RenderWindow App(sf::VideoMode(w, h), "Video with SFML");
sf::Clock clock;
bool Running = true;
while (Running)
{
float time = clock.getElapsedTime().asSeconds();
clock.restart();
viddy.Update(time);
App.clear();
App.draw(sprite);
App.display();
sf::Event Event;
while(App.pollEvent(Event))
{
if (Event.type == sf::Event::Closed)
Running = false;
if ((Event.type == sf::Event::KeyPressed) && (Event.key.code == sf::Keyboard::Escape))
Running = false;
}
}
App.close();
}
//----- END OF MAIN.CPP FILE
I will continue to work on it maybe i can improve it better and make it faster. Check this thread for any update in the future.
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