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cpu encoder: fix chroma row advance timing in YUV420/YVU420 planar path

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_jpeg_write_scanlines_yuv_planar() advanced chroma1_data/chroma2_data
after building the current luma row instead of before, so every even
luma row (>=2) read the previous chroma-row-pair's samples instead of
its own. Move the existing advance check to the top of the loop body,
before the row is built, so it takes effect before the chroma pointers
are read for that row. Condition and stride math are unchanged.
This commit is contained in:
94xhn
2026-07-18 22:08:45 +08:00
parent db96c0699d
commit 5a189866b7
1 changed files with 5 additions and 5 deletions
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10
src/ustreamer/encoders/cpu/encoder.c
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@@ -223,6 +223,11 @@ static void _jpeg_write_scanlines_yuv_planar(struct jpeg_compress_struct *jpeg,
const u8 *chroma2_data = frame->data + luma_array_size + chroma_array_size;
while (jpeg->next_scanline < frame->height) {
if (jpeg->next_scanline > 0 && jpeg->next_scanline % 2 == 0) {
chroma1_data += (frame->width + padding) >> 1;
chroma2_data += (frame->width + padding) >> 1;
}
u8 *ptr = line_buf;
for (uint x = 0; x < frame->width; ++x) {
@@ -253,11 +258,6 @@ static void _jpeg_write_scanlines_yuv_planar(struct jpeg_compress_struct *jpeg,
data += frame->width + padding;
if (jpeg->next_scanline > 0 && jpeg->next_scanline % 2 == 0) {
chroma1_data += (frame->width + padding) >> 1;
chroma2_data += (frame->width + padding) >> 1;
}
JSAMPROW scanlines[1] = {line_buf};
jpeg_write_scanlines(jpeg, scanlines, 1);
}