static int sdl_write_header(AVFormatContext *s) { SDLContext *sdl = s->priv_data; AVStream *st = s->streams[0]; AVCodecContext *encctx = st->codec; AVRational sar, dar; /* sample and display aspect ratios */ int i, ret; int flags = SDL_SWSURFACE | sdl->window_fullscreen ? SDL_FULLSCREEN : 0; if (!sdl->window_title) sdl->window_title = av_strdup(s->filename); if (!sdl->icon_title) sdl->icon_title = av_strdup(sdl->window_title); if (SDL_WasInit(SDL_INIT_VIDEO)) { av_log(s, AV_LOG_ERROR, "SDL video subsystem was already inited, aborting\n"); sdl->sdl_was_already_inited = 1; ret = AVERROR(EINVAL); goto fail; } if (SDL_Init(SDL_INIT_VIDEO) != 0) { av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError()); ret = AVERROR(EINVAL); goto fail; } if ( s->nb_streams > 1 || encctx->codec_type != AVMEDIA_TYPE_VIDEO || encctx->codec_id != AV_CODEC_ID_RAWVIDEO) { av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n"); ret = AVERROR(EINVAL); goto fail; } for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != AV_PIX_FMT_NONE; i++) { if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) { sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt; break; } } if (!sdl->overlay_fmt) { av_log(s, AV_LOG_ERROR, "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n", av_get_pix_fmt_name(encctx->pix_fmt)); ret = AVERROR(EINVAL); goto fail; } /* compute overlay width and height from the codec context information */ sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 }; dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height }); /* we suppose the screen has a 1/1 sample aspect ratio */ if (sdl->window_width && sdl->window_height) { /* fit in the window */ if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) { /* fit in width */ sdl->overlay_width = sdl->window_width; sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num); } else { /* fit in height */ sdl->overlay_height = sdl->window_height; sdl->overlay_width = av_rescale(sdl->overlay_height, dar.num, dar.den); } } else { if (sar.num > sar.den) { sdl->overlay_width = encctx->width; sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num); } else { sdl->overlay_height = encctx->height; sdl->overlay_width = av_rescale(sdl->overlay_height, dar.num, dar.den); } sdl->window_width = sdl->overlay_width; sdl->window_height = sdl->overlay_height; } sdl->overlay_x = (sdl->window_width - sdl->overlay_width ) / 2; sdl->overlay_y = (sdl->window_height - sdl->overlay_height) / 2; SDL_WM_SetCaption(sdl->window_title, sdl->icon_title); sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, 24, flags); if (!sdl->surface) { av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError()); ret = AVERROR(EINVAL); goto fail; } sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height, sdl->overlay_fmt, sdl->surface); if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) { av_log(s, AV_LOG_ERROR, "SDL does not support an overlay with size of %dx%d pixels\n", encctx->width, encctx->height); ret = AVERROR(EINVAL); goto fail; } av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d\n", encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar.num, sar.den, sdl->overlay_width, sdl->overlay_height); return 0; fail: sdl_write_trailer(s); return ret; }