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Fix an ancient bug in the ffms2 video provider that caused access violations when trying to output YV12 images. Nobody discovered this before because nobody tried to use YV12.

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Originally committed to SVN as r3152.
This commit is contained in:
Karl Blomster 2009-07-16 19:20:14 +00:00
parent fb8196dcf8
commit 8087622edd
1 changed files with 11 additions and 7 deletions
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18
aegisub/src/video_provider_ffmpegsource.cpp
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@ -298,17 +298,17 @@ const AegiVideoFrame FFmpegSourceVideoProvider::GetFrame(int _n, int FormatType)
AegiVideoFrame &DstFrame = CurFrame;
// choose output format
if (FormatType & FORMAT_RGB32) {
if (0 /*FormatType & FORMAT_RGB32*/) {
DstFormat = FFMS_GetPixFmt("bgra");
DstFrame.format = FORMAT_RGB32;
} else if (FormatType & FORMAT_RGB24) {
DstFormat = FFMS_GetPixFmt("bgr24");
DstFrame.format = FORMAT_RGB24;
} else if (FormatType & FORMAT_YV12) {
DstFormat = FFMS_GetPixFmt("yuv420p"); // may or may not work
DstFormat = FFMS_GetPixFmt("yuv420p");
DstFrame.format = FORMAT_YV12;
} else if (FormatType & FORMAT_YUY2) {
DstFormat = FFMS_GetPixFmt("yuyv422");
DstFormat = FFMS_GetPixFmt("yuyv422"); // may or may not work
DstFrame.format = FORMAT_YUY2;
} else
throw _T("FFmpegSource video provider: upstream provider requested unknown or unsupported pixel format");
@ -343,10 +343,14 @@ const AegiVideoFrame FFmpegSourceVideoProvider::GetFrame(int _n, int FormatType)
DstFrame.pitch[i] = SrcFrame->Linesize[i];
DstFrame.Allocate();
// copy data to destination, skipping planes with no data in them
for (int j = 0; j < 4; j++) {
if (SrcFrame->Linesize[j] > 0)
memcpy(DstFrame.data[j], SrcFrame->Data[j], DstFrame.pitch[j] * DstFrame.h);
// copy data to destination
memcpy(DstFrame.data[0], SrcFrame->Data[0], DstFrame.pitch[0] * DstFrame.h);
// if we're dealing with YUV formats we need to copy the U and V planes as well
if (DstFrame.format == FORMAT_YUY2 || DstFrame.format == FORMAT_YV12) {
// YV12 has half the vertical U/V resolution too because of the subsampling
int UVHeight = DstFrame.format == FORMAT_YUY2 ? DstFrame.h : DstFrame.h / 2;
memcpy(DstFrame.data[1], SrcFrame->Data[1], DstFrame.pitch[1] * UVHeight);
memcpy(DstFrame.data[2], SrcFrame->Data[2], DstFrame.pitch[2] * UVHeight);
}
return DstFrame;