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video: add more direct mjpeg to yuv conversions

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This commit is contained in:
Green Sky
2026-03-24 13:30:23 +01:00
committed by Sam Lantinga
parent 299ed51984
commit 998159fa95
1 changed files with 32 additions and 2 deletions
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32
src/video/SDL_stb.c
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@@ -22,6 +22,7 @@
#include "SDL_stb_c.h" #include "SDL_stb_c.h"
#include "SDL_surface_c.h" #include "SDL_surface_c.h"
#include "SDL_yuv_c.h"
/* STB image conversion */ /* STB image conversion */
#ifndef SDL_DISABLE_STB #ifndef SDL_DISABLE_STB
@@ -114,8 +115,37 @@ bool SDL_ConvertPixels_STB(int width, int height,
SDL_PixelFormat dst_format, SDL_Colorspace dst_colorspace, SDL_PropertiesID dst_properties, void *dst, int dst_pitch) SDL_PixelFormat dst_format, SDL_Colorspace dst_colorspace, SDL_PropertiesID dst_properties, void *dst, int dst_pitch)
{ {
#ifdef SDL_HAVE_STB #ifdef SDL_HAVE_STB
if (src_format == SDL_PIXELFORMAT_MJPG && dst_format == SDL_PIXELFORMAT_NV12) { if (src_format == SDL_PIXELFORMAT_MJPG) {
if (dst_format == SDL_PIXELFORMAT_NV12) {
return SDL_ConvertPixels_MJPG_to_NV12(width, height, src, src_pitch, dst, dst_pitch); return SDL_ConvertPixels_MJPG_to_NV12(width, height, src, src_pitch, dst, dst_pitch);
} else if (
dst_format == SDL_PIXELFORMAT_YV12 ||
dst_format == SDL_PIXELFORMAT_IYUV ||
dst_format == SDL_PIXELFORMAT_YUY2 ||
dst_format == SDL_PIXELFORMAT_UYVY ||
dst_format == SDL_PIXELFORMAT_YVYU ||
dst_format == SDL_PIXELFORMAT_NV21 ||
dst_format == SDL_PIXELFORMAT_P010
) {
size_t temp_size = 0;
size_t temp_pitch = 0;
if (!SDL_CalculateYUVSize(dst_format, width, height, &temp_size, &temp_pitch)) {
return false;
}
void *temp_pixels = SDL_malloc(temp_size);
if (!temp_pixels) {
return false;
}
if (!SDL_ConvertPixels_MJPG_to_NV12(width, height, src, src_pitch, temp_pixels, (int)temp_pitch)) {
SDL_free(temp_pixels);
return false;
}
bool result = SDL_ConvertPixelsAndColorspace(width, height, SDL_PIXELFORMAT_NV12, src_colorspace, 0 /*props*/, temp_pixels, (int)temp_pitch, dst_format, dst_colorspace, dst_properties, dst, dst_pitch);
SDL_free(temp_pixels);
return result;
}
} }
bool result; bool result;