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lavc can now perfectly seek in CFR videos

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Originally committed to SVN as r164.
This commit is contained in:
Rodrigo Braz Monteiro 2006-02-25 02:27:40 +00:00
parent e8f7defb88
commit 6b17ec30b1
2 changed files with 18 additions and 13 deletions
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29
core/video_provider_lavc.cpp
View file

@ -179,7 +179,7 @@ void LAVCVideoProvider::UpdateDisplaySize() {
//////////////////
// Get next frame
void LAVCVideoProvider::GetNextFrame() {
bool LAVCVideoProvider::GetNextFrame() {
// Read packet
AVPacket packet;
while (av_read_frame(formatContext, &packet)>=0) {
@ -196,11 +196,13 @@ void LAVCVideoProvider::GetNextFrame() {
// Free packet
av_free_packet(&packet);
return;
return true;
}
}
}
av_free_packet(&packet);
// No more packets
return false;
}
@ -286,21 +288,24 @@ wxBitmap LAVCVideoProvider::GetFrame(int n) {
// Needs to seek
else {
// Get seek position
__int64 half = __int64(AV_TIME_BASE) * stream->r_frame_rate.den / stream->r_frame_rate.num / 2;
__int64 seekTo = __int64(n) * AV_TIME_BASE * stream->r_frame_rate.den / stream->r_frame_rate.num + stream->start_time;
if (seekTo > half) seekTo -= half;
else seekTo = 0;
__int64 finalPos = av_rescale(seekTo,stream->time_base.den,AV_TIME_BASE * __int64(stream->time_base.num));
//__int64 half = __int64(AV_TIME_BASE) * stream->r_frame_rate.den / stream->r_frame_rate.num / 2;
//__int64 seekTo = __int64(n) * AV_TIME_BASE * stream->r_frame_rate.den / stream->r_frame_rate.num + stream->start_time;
//if (seekTo > half) seekTo -= half;
//else seekTo = 0;
//__int64 finalPos = av_rescale(seekTo,stream->time_base.den,AV_TIME_BASE * __int64(stream->time_base.num));
// Seek to keyframe
//int result = av_seek_frame(formatContext,vidStream,finalPos,0);
int result = av_seek_frame(formatContext,vidStream,finalPos,AVSEEK_FLAG_BACKWARD);
int result = av_seek_frame(formatContext,vidStream,n,AVSEEK_FLAG_BACKWARD);
avcodec_flush_buffers(codecContext);
// Seek until final frame
bool ok = true;
do {
GetNextFrame();
} while (lastDecodeTime < n);
ok = GetNextFrame();
//if (!ok) {
// return wxBitmap(GetWidth(),GetHeight());
//}
} while (lastDecodeTime <= n && ok);
}
// Bitmap

2
core/video_provider_lavc.h
View file

@ -81,7 +81,7 @@ private:
int buffer2Size;
void UpdateDisplaySize();
void GetNextFrame();
bool GetNextFrame();
void LoadVideo(wxString filename);
void Close();
wxBitmap AVFrameToWX(AVFrame *frame);