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Aegisub/aegisub/video_context.cpp

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// Copyright (c) 2005-2007, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
////////////
// Includes
#ifdef __APPLE__
#include <OpenGL/GL.h>
#include <OpenGL/glu.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif
#include <wx/image.h>
#include <string.h>
#include <wx/clipbrd.h>
#include <wx/filename.h>
#include <wx/config.h>
#include "utils.h"
#include "video_display.h"
#include "video_context.h"
#include "video_provider_manager.h"
#include "visual_tool.h"
#include "subtitles_provider_manager.h"
#include "vfr.h"
#include "ass_file.h"
#include "ass_exporter.h"
#include "ass_time.h"
#include "ass_dialogue.h"
#include "ass_style.h"
#include "subs_grid.h"
#include "options.h"
#include "subs_edit_box.h"
#include "audio_display.h"
#include "video_slider.h"
#include "video_box.h"
#include "utils.h"
#include "gl_wrap.h"
#include "standard_paths.h"
///////
// IDs
enum {
VIDEO_PLAY_TIMER = 1300
};
///////////////
// Event table
BEGIN_EVENT_TABLE(VideoContext, wxEvtHandler)
EVT_TIMER(VIDEO_PLAY_TIMER,VideoContext::OnPlayTimer)
END_EVENT_TABLE()
////////////
// Instance
VideoContext *VideoContext::instance = NULL;
///////////////
// Constructor
VideoContext::VideoContext() {
// Set GL context
glContext = NULL;
lastTex = 0;
lastFrame = -1;
yv12shader = 0;
// Set options
audio = NULL;
provider = NULL;
subsProvider = NULL;
curLine = NULL;
loaded = false;
keyFramesLoaded = false;
overKeyFramesLoaded = false;
frame_n = 0;
arType = 0;
arValue = 1.0;
isPlaying = false;
nextFrame = -1;
keepAudioSync = true;
// Threads
//threaded = Options.AsBool(_T("Threaded Video"));
threaded = false;
threadLocked = false;
threadNextFrame = -1;
}
//////////////
// Destructor
VideoContext::~VideoContext () {
Reset();
delete glContext;
glContext = NULL;
}
////////////////
// Get Instance
VideoContext *VideoContext::Get() {
if (!instance) {
instance = new VideoContext;
}
return instance;
}
/////////
// Clear
void VideoContext::Clear() {
instance->audio = NULL;
delete instance;
instance = NULL;
}
/////////
// Reset
void VideoContext::Reset() {
// Reset ?video path
StandardPaths::SetPathValue(_T("?video"),_T(""));
// Reset shader
if (yv12shader) {
OpenGLWrapper::DestroyShaderProgram(yv12shader);
yv12shader = 0;
}
// Clear keyframes
KeyFrames.Clear();
keyFramesLoaded = false;
// Remove temporary audio provider
if (audio && audio->temporary) {
delete audio->provider;
audio->provider = NULL;
delete audio->player;
audio->player = NULL;
audio->temporary = false;
}
// Remove video data
loaded = false;
frame_n = 0;
keyFramesLoaded = false;
overKeyFramesLoaded = false;
isPlaying = false;
nextFrame = -1;
curLine = NULL;
// Update displays
UpdateDisplays(true);
// Remove textures
UnloadTexture();
// Clean up video data
wxRemoveFile(tempfile);
tempfile = _T("");
videoName = _T("");
tempFrame.Clear();
// Remove provider
if (provider) {
if (subsProvider && !subsProvider->LockedToVideo()) delete subsProvider;
delete provider;
provider = NULL;
}
else delete subsProvider;
subsProvider = NULL;
}
////////////////
// Reload video
void VideoContext::Reload() {
if (IsLoaded()) {
wxString name = videoName;
int n = frame_n;
SetVideo(_T(""));
SetVideo(name);
JumpToFrame(n);
}
}
//////////////////
// Unload texture
void VideoContext::UnloadTexture() {
// Remove textures
if (lastTex != 0) {
glDeleteTextures(1,&lastTex);
lastTex = 0;
}
lastFrame = -1;
}
///////////////////////
// Sets video filename
void VideoContext::SetVideo(const wxString &filename) {
// Unload video
Reset();
threaded = Options.AsBool(_T("Threaded Video"));
// Load video
if (!filename.IsEmpty()) {
try {
grid->CommitChanges(true);
// double overFps = 0;
FrameRate temp;
// Unload timecodes
//int unload = wxYES;
//if (VFR_Output.IsLoaded()) unload = wxMessageBox(_("Do you want to unload timecodes, too?"),_("Unload timecodes?"),wxYES_NO | wxICON_QUESTION);
//if (unload == wxYES) VFR_Output.Unload();
// Set GL context
#ifdef __WXMAC__
GetGLContext(displayList.front())->SetCurrent();
#else
GetGLContext(displayList.front())->SetCurrent(*displayList.front());
#endif
// Choose a provider
provider = VideoProviderFactoryManager::GetProvider(filename, 0);
loaded = provider != NULL;
// Get subtitles provider
try {
subsProvider = provider->GetAsSubtitlesProvider();
if (!subsProvider) subsProvider = SubtitlesProviderFactoryManager::GetProvider();
}
catch (wxString err) { wxMessageBox(_T("Error while loading subtitles provider: ") + err,_T("Subtitles provider")); }
catch (const wchar_t *err) { wxMessageBox(_T("Error while loading subtitles provider: ") + wxString(err),_T("Subtitles provider")); }
KeyFrames.Clear();
// load keyframes if available
if (provider->AreKeyFramesLoaded()) {
KeyFrames = provider->GetKeyFrames();
keyFramesLoaded = true;
}
else {
keyFramesLoaded = false;
}
bool isVfr = provider->IsVFR();
// Set frame rate
fps = provider->GetFPS();
if (!isVfr || provider->IsNativelyByFrames()) {
VFR_Input.SetCFR(fps);
if (VFR_Output.GetFrameRateType() != VFR) VFR_Output.SetCFR(fps);
}
else {
FrameRate temp = provider->GetTrueFrameRate();
provider->OverrideFrameTimeList(temp.GetFrameTimeList());
}
// Gather video parameters
length = provider->GetFrameCount();
w = provider->GetWidth();
h = provider->GetHeight();
// Set filename
videoName = filename;
Options.AddToRecentList(filename,_T("Recent vid"));
wxFileName fn(filename);
StandardPaths::SetPathValue(_T("?video"),fn.GetPath());
// Get frame
frame_n = 0;
//UpdateDisplays(true);
Refresh(true,true);
// Show warning
wxString warning = provider->GetWarning().c_str();
if (!warning.IsEmpty()) wxMessageBox(warning,_T("Warning"),wxICON_WARNING | wxOK);
}
catch (wxString &e) {
wxMessageBox(e,_T("Error setting video"),wxICON_ERROR | wxOK);
}
}
loaded = provider != NULL;
}
///////////////////
// Add new display
void VideoContext::AddDisplay(VideoDisplay *display) {
for (std::list<VideoDisplay*>::iterator cur=displayList.begin();cur!=displayList.end();cur++) {
if ((*cur) == display) return;
}
displayList.push_back(display);
}
//////////////////
// Remove display
void VideoContext::RemoveDisplay(VideoDisplay *display) {
displayList.remove(display);
}
///////////////////
// Update displays
void VideoContext::UpdateDisplays(bool full) {
for (std::list<VideoDisplay*>::iterator cur=displayList.begin();cur!=displayList.end();cur++) {
// Get display
VideoDisplay *display = *cur;
// Update slider
if (full) {
display->UpdateSize();
display->ControlSlider->SetRange(0,GetLength()-1);
}
display->ControlSlider->SetValue(GetFrameN());
//display->ControlSlider->Update();
display->UpdatePositionDisplay();
// If not shown, don't update the display itself
if (!display->IsShownOnScreen()) continue;
// Update visual controls
if (display->visual) display->visual->Refresh();
// Update controls
//display->Refresh();
//display->Update();
display->Render();
}
// Update audio display
if (audio && audio->loaded && audio->IsShownOnScreen()) {
if (Options.AsBool(_T("Audio Draw Video Position"))) {
audio->UpdateImage(false);
}
}
}
/////////////////////
// Refresh subtitles
void VideoContext::Refresh (bool video, bool subtitles) {
// Reset frame
lastFrame = -1;
// Update subtitles
if (subtitles && subsProvider) {
// Re-export
AssExporter exporter(grid->ass);
exporter.AddAutoFilters();
subsProvider->LoadSubtitles(exporter.ExportTransform());
}
// Jump to frame
JumpToFrame(frame_n);
}
///////////////////////////////////////
// Jumps to a frame and update display
void VideoContext::JumpToFrame(int n) {
// Loaded?
if (!loaded) return;
// Prevent intervention during playback
if (isPlaying && n != playNextFrame) return;
// Threaded
if (threaded && false) { // Doesn't work, so it's disabled
wxMutexLocker lock(vidMutex);
threadNextFrame = n;
if (!threadLocked) {
threadLocked = true;
thread = new VideoContextThread(this);
thread->Create();
thread->Run();
}
}
// Not threaded
else {
// Set frame number
frame_n = n;
GetFrameAsTexture(n);
// Display
UpdateDisplays(false);
// Update grid
if (!isPlaying && Options.AsBool(_T("Highlight subs in frame"))) grid->Refresh(false);
}
}
////////////////////////////
// Jumps to a specific time
void VideoContext::JumpToTime(int ms,bool exact) {
int frame;
if (exact) frame = VFR_Output.PFrameAtTime(ms);
else frame = VFR_Output.GetFrameAtTime(ms);
JumpToFrame(frame);
}
//////////////////
// Get GL context
wxGLContext *VideoContext::GetGLContext(wxGLCanvas *canvas) {
#ifdef __WXMAC__
// This is probably wrong...
if (!glContext) glContext = new wxGLContext(0, canvas, wxPalette(), 0);
#else
if (!glContext) glContext = new wxGLContext(canvas);
#endif
return glContext;
/*
if (!((VideoDisplay*)canvas)->freeSize) return glContext;
else {
static wxGLContext *test = NULL;
if (test = NULL) test = new wxGLContext(canvas,glContext);
return test;
}*/
}
////////////////////////
// Requests a new frame
AegiVideoFrame VideoContext::GetFrame(int n,bool raw) {
// Current frame if -1
if (n == -1) n = frame_n;
// Get available formats
int formats = FORMAT_RGB32;
if (yv12shader != 0 || OpenGLWrapper::UseShaders()) formats |= FORMAT_YV12;
// Get frame
AegiVideoFrame frame = provider->GetFrame(n,formats);
// Raster subtitles if available/necessary
if (!raw && subsProvider && subsProvider->CanRaster()) {
tempFrame.CopyFrom(frame);
subsProvider->DrawSubtitles(tempFrame,VFR_Input.GetTimeAtFrame(n,true,true)/1000.0);
return tempFrame;
}
// Return pure frame
else return frame;
}
///////////////////////////
// Get GL Texture of frame
GLuint VideoContext::GetFrameAsTexture(int n) {
// Already uploaded
if (n == lastFrame || n == -1) return lastTex;
// Get frame
AegiVideoFrame frame = GetFrame(n);
// Set frame
lastFrame = n;
// Set context
#ifdef __APPLE__
GetGLContext(displayList.front())->SetCurrent();
#else
GetGLContext(displayList.front())->SetCurrent(*displayList.front());
#endif
glEnable(GL_TEXTURE_2D);
if (glGetError() != 0) throw _T("Error enabling texture.");
// Image type
GLenum format = GL_LUMINANCE;
if (frame.format == FORMAT_RGB32) {
if (frame.invertChannels) format = GL_BGRA_EXT;
else format = GL_RGBA;
}
else if (frame.format == FORMAT_RGB24) {
if (frame.invertChannels) format = GL_BGR_EXT;
else format = GL_RGB;
}
else if (frame.format == FORMAT_YV12) {
format = GL_LUMINANCE;
}
isInverted = frame.flipped;
if (lastTex == 0) {
// Enable
glShadeModel(GL_FLAT);
// Generate texture with GL
//glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &lastTex);
if (glGetError() != 0) throw _T("Error generating texture.");
glBindTexture(GL_TEXTURE_2D, lastTex);
if (glGetError() != 0) throw _T("Error binding texture.");
// Texture parameters
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
if (glGetError() != 0) throw _T("Error setting min_filter texture parameter.");
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
if (glGetError() != 0) throw _T("Error setting mag_filter texture parameter.");
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
if (glGetError() != 0) throw _T("Error setting wrap_s texture parameter.");
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
if (glGetError() != 0) throw _T("Error setting wrap_t texture parameter.");
// Allocate texture
int height = frame.h;
if (frame.format == FORMAT_YV12) height = height * 3 / 2;
int tw = SmallestPowerOf2(MAX(frame.pitch[0]/frame.GetBpp(0),frame.pitch[1]+frame.pitch[2]));
int th = SmallestPowerOf2(height);
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA8,tw,th,0,format,GL_UNSIGNED_BYTE,NULL);
if (glGetError() != 0) {
tw = MAX(tw,th);
th = tw;
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA8,tw,th,0,format,GL_UNSIGNED_BYTE,NULL);
if (glGetError() != 0) {
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,tw,th,0,format,GL_UNSIGNED_BYTE,NULL);
if (glGetError() != 0) throw _T("Error allocating texture.");
}
}
texW = float(frame.w)/float(tw);
texH = float(frame.h)/float(th);
// Set texture
//glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
//if (glGetError() != 0) throw _T("Error setting hinting.");
// Create shader
if (frame.format == FORMAT_YV12 && yv12shader == 0 && OpenGLWrapper::UseShaders()) {
yv12shader = OpenGLWrapper::CreateYV12Shader(texW,texH,float(frame.pitch[1])/float(tw));
}
// Set priority
float priority = 1.0f;
glPrioritizeTextures(1,&lastTex,&priority);
}
// Load texture data
glBindTexture(GL_TEXTURE_2D, lastTex);
glTexSubImage2D(GL_TEXTURE_2D,0,0,0,frame.pitch[0]/frame.GetBpp(0),frame.h,format,GL_UNSIGNED_BYTE,frame.data[0]);
if (glGetError() != 0) throw _T("Error uploading primary plane");
// UV planes for YV12
if (frame.format == FORMAT_YV12) {
int u = 1;
int v = 2;
if (frame.invertChannels) {
u = 2;
v = 1;
}
glTexSubImage2D(GL_TEXTURE_2D,0,0,frame.h,frame.pitch[1],frame.h/2,format,GL_UNSIGNED_BYTE,frame.data[u]);
if (glGetError() != 0) throw _T("Error uploading U plane.");
glTexSubImage2D(GL_TEXTURE_2D,0,frame.pitch[1],frame.h,frame.pitch[2],frame.h/2,format,GL_UNSIGNED_BYTE,frame.data[v]);
if (glGetError() != 0) throw _T("Error uploadinv V plane.");
}
// Return texture number
return lastTex;
}
/////////////////
// Save snapshot
void VideoContext::SaveSnapshot(bool raw) {
// Get folder
wxString option = Options.AsText(_("Video Screenshot Path"));
wxFileName videoFile(videoName);
wxString basepath;
// Is it a path specifier and not an actual fixed path?
if (option[0] == _T('?')) {
// If dummy video is loaded, we can't save to the video location
if (option.StartsWith(_T("?video")) && (videoName.Find(_T("?dummy")) != wxNOT_FOUND)) {
// So try the script location instead
option = _T("?script");
}
// Find out where the ?specifier points to
basepath = StandardPaths::DecodePath(option);
// If whereever that is isn't defined, we can't save there
if ((basepath == _T("\\")) || (basepath == _T("/"))) {
// So save to the current user's home dir instead
basepath = wxGetHomeDir();
}
}
// Actual fixed (possibly relative) path, decode it
else basepath = DecodeRelativePath(option,StandardPaths::DecodePath(_T("?user/")));
basepath += _T("/") + videoFile.GetName();
// Get full path
int session_shot_count = 1;
wxString path;
while (1) {
path = basepath + wxString::Format(_T("_%03i_%i.png"),session_shot_count,frame_n);
++session_shot_count;
wxFileName tryPath(path);
if (!tryPath.FileExists()) break;
}
// Save
GetFrame(frame_n,raw).GetImage().SaveFile(path,wxBITMAP_TYPE_PNG);
}
////////////////////////////
// Get dimensions of script
void VideoContext::GetScriptSize(int &sw,int &sh) {
grid->ass->GetResolution(sw,sh);
}
////////
// Play
void VideoContext::Play() {
// Stop if already playing
if (isPlaying) {
Stop();
return;
}
// Set variables
startFrame = frame_n;
endFrame = -1;
// Start playing audio
audio->Play(VFR_Output.GetTimeAtFrame(startFrame),-1);
//audio->Play will override this if we put it before, so put it after.
isPlaying = true;
// Start timer
playTime.Start();
playback.SetOwner(this,VIDEO_PLAY_TIMER);
playback.Start(10);
}
/////////////
// Play line
void VideoContext::PlayLine() {
// Get line
AssDialogue *curline = grid->GetDialogue(grid->editBox->linen);
if (!curline) return;
// Start playing audio
audio->Play(curline->Start.GetMS(),curline->End.GetMS());
// Set variables
isPlaying = true;
startFrame = VFR_Output.GetFrameAtTime(curline->Start.GetMS(),true);
endFrame = VFR_Output.GetFrameAtTime(curline->End.GetMS(),false);
// Jump to start
playNextFrame = startFrame;
JumpToFrame(startFrame);
// Set other variables
playTime.Start();
// Start timer
playback.SetOwner(this,VIDEO_PLAY_TIMER);
playback.Start(10);
}
////////
// Stop
void VideoContext::Stop() {
if (isPlaying) {
playback.Stop();
isPlaying = false;
audio->Stop();
}
}
//////////////
// Play timer
void VideoContext::OnPlayTimer(wxTimerEvent &event) {
// Lock
wxMutexError res = playMutex.TryLock();
if (res == wxMUTEX_BUSY) return;
playMutex.Unlock();
wxMutexLocker lock(playMutex);
// Get time difference
int dif = playTime.Time();
// Find next frame
int startMs = VFR_Output.GetTimeAtFrame(startFrame);
int nextFrame = frame_n;
int i=0;
for (i=0;i<10;i++) {
if (nextFrame >= length) break;
if (dif < VFR_Output.GetTimeAtFrame(nextFrame) - startMs) {
break;
}
nextFrame++;
}
// End
if (nextFrame >= length || (endFrame != -1 && nextFrame > endFrame)) {
Stop();
return;
}
// Same frame
if (nextFrame == frame_n) return;
// Next frame is before or over 2 frames ahead, so force audio resync
if (keepAudioSync && (nextFrame < frame_n || nextFrame > frame_n + 2)) audio->player->SetCurrentPosition(audio->GetSampleAtMS(VFR_Output.GetTimeAtFrame(nextFrame)));
// Jump to next frame
playNextFrame = nextFrame;
frame_n = nextFrame;
JumpToFrame(nextFrame);
// Sync audio
if (keepAudioSync && nextFrame % 10 == 0 && audio && audio->provider && audio->player) {
int64_t audPos = audio->GetSampleAtMS(VFR_Output.GetTimeAtFrame(nextFrame));
int64_t curPos = audio->player->GetCurrentPosition();
int delta = int(audPos-curPos);
if (delta < 0) delta = -delta;
int maxDelta = audio->provider->GetSampleRate();
if (delta > maxDelta) audio->player->SetCurrentPosition(audPos);
}
}
//////////////////////////////
// Get name of temp work file
wxString VideoContext::GetTempWorkFile () {
if (tempfile.IsEmpty()) {
tempfile = wxFileName::CreateTempFileName(_T("aegisub"));
wxRemoveFile(tempfile);
tempfile += _T(".ass");
}
return tempfile;
}
/////////////////
// Get keyframes
wxArrayInt VideoContext::GetKeyFrames() {
if (OverKeyFramesLoaded()) return overKeyFrames;
return KeyFrames;
}
/////////////////
// Set keyframes
void VideoContext::SetKeyFrames(wxArrayInt frames) {
KeyFrames = frames;
}
/////////////////////////
// Set keyframe override
void VideoContext::SetOverKeyFrames(wxArrayInt frames) {
overKeyFrames = frames;
overKeyFramesLoaded = true;
}
///////////////////
// Close keyframes
void VideoContext::CloseOverKeyFrames() {
overKeyFrames.Clear();
overKeyFramesLoaded = false;
}
//////////////////////////////////////////
// Check if override keyframes are loaded
bool VideoContext::OverKeyFramesLoaded() {
return overKeyFramesLoaded;
}
/////////////////////////////////
// Check if keyframes are loaded
bool VideoContext::KeyFramesLoaded() {
return overKeyFramesLoaded || keyFramesLoaded;
}
//////////////////////////
// Calculate aspect ratio
double VideoContext::GetARFromType(int type) {
if (type == 0) return (double)VideoContext::Get()->GetWidth()/(double)VideoContext::Get()->GetHeight();
if (type == 1) return 4.0/3.0;
if (type == 2) return 16.0/9.0;
if (type == 3) return 2.35;
return 1.0; //error
}
/////////////////////
// Sets aspect ratio
void VideoContext::SetAspectRatio(int _type, double value) {
// Get value
if (_type != 4) value = GetARFromType(_type);
if (value < 0.5) value = 0.5;
if (value > 5.0) value = 5.0;
// Set
arType = _type;
arValue = value;
UpdateDisplays(true);
}
////////////////////////////
// Enable or disable shader
void VideoContext::SetShader(bool enabled) {
OpenGLWrapper::SetShader(enabled ? yv12shader : 0);
}
////////////////////////////////////////////////
// Can draw subtitles independently from video?
bool VideoContext::HasIndependentSubs() {
return subsProvider && subsProvider->CanRaster();
}
//////////////////////
// Thread constructor
VideoContextThread::VideoContextThread(VideoContext *par)
: wxThread(wxTHREAD_DETACHED)
{
parent = par;
}
//////////////////////
// Thread entry point
wxThread::ExitCode VideoContextThread::Entry() {
// Set up thread
int frame = parent->threadNextFrame;
int curFrame = parent->frame_n;
bool highSubs = Options.AsBool(_T("Highlight subs in frame"));
// Loop while there is work to do
while (true) {
// Get frame and set frame number
{
wxMutexLocker glLock(OpenGLWrapper::glMutex);
parent->GetFrameAsTexture(frame);
parent->frame_n = frame;
}
// Display
parent->UpdateDisplays(false);
// Update grid
if (!parent->isPlaying && highSubs) parent->grid->Refresh(false);
// Get lock and check if there is more to do
wxMutexLocker lock(parent->vidMutex);
curFrame = parent->frame_n;
frame = parent->threadNextFrame;
// Work done, kill thread and release context
if (curFrame == frame) {
parent->threadLocked = false;
parent->threadNextFrame = -1;
Delete();
return 0;
}
}
}
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