ref: 80aa7823fbbfe5e3b8c1aeba2dad9234f5225d30
dir: /examples/dp_renderer_sdl.c/
/* * Copyright © 2020, VideoLAN and dav1d authors * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "dp_renderer.h" #include <assert.h> /** * Renderer context for SDL */ typedef struct renderer_priv_ctx { // SDL window SDL_Window *win; // SDL renderer SDL_Renderer *renderer; // Lock protecting access to the texture SDL_mutex *lock; // Texture to render SDL_Texture *tex; } Dav1dPlayRendererPrivateContext; static void *sdl_renderer_create() { SDL_Window *win = dp_create_sdl_window(0); if (win == NULL) return NULL; // Alloc Dav1dPlayRendererPrivateContext *rd_priv_ctx = malloc(sizeof(Dav1dPlayRendererPrivateContext)); if (rd_priv_ctx == NULL) { return NULL; } rd_priv_ctx->win = win; // Create renderer rd_priv_ctx->renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED); // Set scale quality SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear"); // Create Mutex rd_priv_ctx->lock = SDL_CreateMutex(); if (rd_priv_ctx->lock == NULL) { fprintf(stderr, "SDL_CreateMutex failed: %s\n", SDL_GetError()); free(rd_priv_ctx); return NULL; } rd_priv_ctx->tex = NULL; return rd_priv_ctx; } static void sdl_renderer_destroy(void *cookie) { Dav1dPlayRendererPrivateContext *rd_priv_ctx = cookie; assert(rd_priv_ctx != NULL); SDL_DestroyRenderer(rd_priv_ctx->renderer); SDL_DestroyMutex(rd_priv_ctx->lock); free(rd_priv_ctx); } static void sdl_render(void *cookie, const Dav1dPlaySettings *settings) { Dav1dPlayRendererPrivateContext *rd_priv_ctx = cookie; assert(rd_priv_ctx != NULL); SDL_LockMutex(rd_priv_ctx->lock); if (rd_priv_ctx->tex == NULL) { SDL_UnlockMutex(rd_priv_ctx->lock); return; } // Display the frame SDL_RenderClear(rd_priv_ctx->renderer); SDL_RenderCopy(rd_priv_ctx->renderer, rd_priv_ctx->tex, NULL, NULL); SDL_RenderPresent(rd_priv_ctx->renderer); SDL_UnlockMutex(rd_priv_ctx->lock); } static int sdl_update_texture(void *cookie, Dav1dPicture *dav1d_pic, const Dav1dPlaySettings *settings) { Dav1dPlayRendererPrivateContext *rd_priv_ctx = cookie; assert(rd_priv_ctx != NULL); SDL_LockMutex(rd_priv_ctx->lock); if (dav1d_pic == NULL) { rd_priv_ctx->tex = NULL; SDL_UnlockMutex(rd_priv_ctx->lock); return 0; } int width = dav1d_pic->p.w; int height = dav1d_pic->p.h; int tex_w = width; int tex_h = height; enum Dav1dPixelLayout dav1d_layout = dav1d_pic->p.layout; if (DAV1D_PIXEL_LAYOUT_I420 != dav1d_layout || dav1d_pic->p.bpc != 8) { fprintf(stderr, "Unsupported pixel format, only 8bit 420 supported so far.\n"); exit(50); } SDL_Texture *texture = rd_priv_ctx->tex; if (texture != NULL) { SDL_QueryTexture(texture, NULL, NULL, &tex_w, &tex_h); if (tex_w != width || tex_h != height) { SDL_DestroyTexture(texture); texture = NULL; } } if (texture == NULL) { texture = SDL_CreateTexture(rd_priv_ctx->renderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, width, height); } SDL_UpdateYUVTexture(texture, NULL, dav1d_pic->data[0], (int)dav1d_pic->stride[0], // Y dav1d_pic->data[1], (int)dav1d_pic->stride[1], // U dav1d_pic->data[2], (int)dav1d_pic->stride[1] // V ); rd_priv_ctx->tex = texture; SDL_UnlockMutex(rd_priv_ctx->lock); return 0; } const Dav1dPlayRenderInfo rdr_sdl = { .name = "sdl", .create_renderer = sdl_renderer_create, .destroy_renderer = sdl_renderer_destroy, .render = sdl_render, .update_frame = sdl_update_texture };