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dec265: Resize window if image resolution changes mid-stream. #462

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dec265: Resize window if image resolution changes mid-stream. #462

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18 changes: 10 additions & 8 deletions dec265/dec265.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -266,17 +266,19 @@ bool display_sdl(const struct de265_image* img)

de265_chroma chroma = de265_get_chroma_format(img);

enum SDL_YUV_Display::SDL_Chroma sdlChroma;
switch (chroma) {
case de265_chroma_420: sdlChroma = SDL_YUV_Display::SDL_CHROMA_420; break;
case de265_chroma_422: sdlChroma = SDL_YUV_Display::SDL_CHROMA_422; break;
case de265_chroma_444: sdlChroma = SDL_YUV_Display::SDL_CHROMA_444; break;
case de265_chroma_mono: sdlChroma = SDL_YUV_Display::SDL_CHROMA_MONO; break;
}

if (!sdl_active) {
sdl_active=true;
enum SDL_YUV_Display::SDL_Chroma sdlChroma;
switch (chroma) {
case de265_chroma_420: sdlChroma = SDL_YUV_Display::SDL_CHROMA_420; break;
case de265_chroma_422: sdlChroma = SDL_YUV_Display::SDL_CHROMA_422; break;
case de265_chroma_444: sdlChroma = SDL_YUV_Display::SDL_CHROMA_444; break;
case de265_chroma_mono: sdlChroma = SDL_YUV_Display::SDL_CHROMA_MONO; break;
}

sdlWin.init(width,height, sdlChroma);
} else {
sdlWin.resize(width,height, sdlChroma);
}

int stride,chroma_stride;
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52 changes: 52 additions & 0 deletions dec265/sdl.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,58 @@ bool SDL_YUV_Display::init(int frame_width, int frame_height, enum SDL_Chroma ch
return true;
}

bool SDL_YUV_Display::resize(int frame_width, int frame_height, enum SDL_Chroma chroma)
{
// reduce image size to a multiple of 8 (apparently required by YUV overlay)

frame_width &= ~7;
frame_height &= ~7;

if (frame_width == rect.w && frame_height == rect.h && mChroma == chroma) {
return true;
}

SDL_SetWindowSize(mWindow, frame_width, frame_height);
SDL_DestroyTexture(mTexture);
SDL_DestroyRenderer(mRenderer);

Uint32 flags = 0; // Empty flags prioritize SDL_RENDERER_ACCELERATED.
mRenderer = SDL_CreateRenderer(mWindow, -1, flags);
if (!mRenderer) {
printf("SDL: Couldn't create renderer: %s\n", SDL_GetError());
SDL_Quit();
return false;
}

Uint32 pixelFormat = 0;
switch (mChroma) {
case SDL_CHROMA_MONO: pixelFormat = SDL_PIXELFORMAT_YV12; break;
case SDL_CHROMA_420: pixelFormat = SDL_PIXELFORMAT_YV12; break;
case SDL_CHROMA_422: pixelFormat = SDL_PIXELFORMAT_YV12; break;
case SDL_CHROMA_444: pixelFormat = SDL_PIXELFORMAT_YV12; break;
//case SDL_CHROMA_444: pixelFormat = SDL_PIXELFORMAT_YV12; break;
default:
printf("Unsupported chroma: %d\n", mChroma);
SDL_Quit();
return false;
}

mTexture = SDL_CreateTexture(mRenderer, pixelFormat,
SDL_TEXTUREACCESS_STREAMING, frame_width, frame_height);
if (!mTexture ) {
printf("SDL: Couldn't create SDL texture: %s\n", SDL_GetError());
SDL_Quit();
return false;
}

mChroma = chroma;

rect.w = frame_width;
rect.h = frame_height;

return true;
}

void SDL_YUV_Display::display(const unsigned char *Y,
const unsigned char *U,
const unsigned char *V,
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1 change: 1 addition & 0 deletions dec265/sdl.hh
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,7 @@ public:
};

bool init(int frame_width, int frame_height, enum SDL_Chroma chroma = SDL_CHROMA_420);
bool resize(int frame_width, int frame_height, enum SDL_Chroma chroma = SDL_CHROMA_420);
void display(const unsigned char *Y, const unsigned char *U, const unsigned char *V,
int stride, int chroma_stride);
void close();
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