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Camera: Remember the JPEG quality that fit the last frame

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Start from the quality that fit the previous frame instead of the top, so
most frames encode once. Step down while a frame is too big, and step back
up when one comes out under half the limit. Windows and the recompression
fallback share the logic.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
This commit is contained in:
Henrik RydgårdandClaude Opus 5.5 committed 2026-09-29 12:29:04 -06:00
1 parent 07556d064e
commit 9e54cebcc2
3 files changed
+46 -28
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Windows/CaptureDevice.cpp
+10 -15
View File
@@ -247,22 +247,17 @@ HRESULT ReaderCallback::OnReadSample(
}
}
// Compress image to jpeg from RGB24. Like the PSP camera, lower the quality until the frame
// fits the size the game asked for: Go!Edit stores frames in fixed 15KB slots.
const int maxFrameSize = Camera::getMaxFrameSize();
jpge::params params;
for (int quality = 85; ; quality -= 10) {
imgJpegSize = device->imgJpegSize;
// Compress image to jpeg from RGB24. Like the PSP camera, fit the size the game asked for:
// Go!Edit stores frames in fixed 15KB slots.
imgJpegSize = Camera::encodeToFit(Camera::getMaxFrameSize(), [&](int quality) {
jpge::params params;
params.m_quality = quality;
jpge::compress_image_to_jpeg_file_in_memory(
device->imageJpeg, imgJpegSize,
dstW,
dstH,
3,
device->imageRGB, params);
if (imgJpegSize <= maxFrameSize || quality <= 15) {
break;
}
int size = device->imgJpegSize;
return jpge::compress_image_to_jpeg_file_in_memory(
device->imageJpeg, size, dstW, dstH, 3, device->imageRGB, params) ? size : -1;
});
if (imgJpegSize < 0) {
imgJpegSize = 0;
}
}
#endif