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testcamera: added support for Motion JPEG camera frames

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This commit is contained in:
Sam Lantinga
2025-02-10 16:43:48 -08:00
parent cf41ccc6ce
commit 5ccee77190
4 changed files with 8014 additions and 3 deletions
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26
test/testcamera.c
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@@ -15,6 +15,12 @@
#include <SDL3/SDL_test.h>
#include <SDL3/SDL_test_common.h>
#define STB_IMAGE_IMPLEMENTATION
#define STBI_ONLY_JPEG
#define STBI_NO_HDR
#define STBI_NO_LINEAR
#include "stb_image.h"
static SDL_Window *window = NULL;
static SDL_Renderer *renderer = NULL;
static SDLTest_CommonState *state = NULL;
@@ -343,7 +349,11 @@ SDL_AppResult SDL_AppIterate(void *appstate)
/* Create texture with appropriate format */
SDL_PropertiesID props = SDL_CreateProperties();
SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_FORMAT_NUMBER, frame_current->format);
if (frame_current->format == SDL_PIXELFORMAT_MJPG) {
SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_FORMAT_NUMBER, SDL_PIXELFORMAT_RGBA32);
} else {
SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_FORMAT_NUMBER, frame_current->format);
}
SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_COLORSPACE_NUMBER, colorspace);
SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_ACCESS_NUMBER, SDL_TEXTUREACCESS_STREAMING);
SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_WIDTH_NUMBER, frame_current->w);
@@ -358,7 +368,19 @@ SDL_AppResult SDL_AppIterate(void *appstate)
/* Update SDL_Texture with last video frame (only once per new frame) */
if (frame_current && !texture_updated) {
SDL_UpdateTexture(texture, NULL, frame_current->pixels, frame_current->pitch);
if (frame_current->format == SDL_PIXELFORMAT_MJPG) {
/* Note: This is very slow if compiled without optimizations */
int w = 0, h = 0, format = 0;
stbi_uc *pixels = stbi_load_from_memory(frame_current->pixels, frame_current->pitch, &w, &h, &format, 4);
if (pixels) {
SDL_UpdateTexture(texture, NULL, pixels, frame_current->w * 4);
stbi_image_free(pixels);
} else {
SDL_Log("Couldn't decode JPEG: %s", stbi_failure_reason());
}
} else {
SDL_UpdateTexture(texture, NULL, frame_current->pixels, frame_current->pitch);
}
texture_updated = true;
}