/* * Copyright (c) 2011 Stefano Sabatini * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * libSDL output device */ #include <SDL.h> #include "libavutil/avstring.h" #include "libavutil/opt.h" #include "libavutil/parseutils.h" #include "libavutil/pixdesc.h" #include "avdevice.h" typedef struct { AVClass *class; SDL_Surface *surface; SDL_Overlay *overlay; char *window_title; char *icon_title; char *window_size; int window_width, window_height; int overlay_width, overlay_height; int overlay_fmt; int sdl_was_already_inited; } SDLContext; static const struct sdl_overlay_pix_fmt_entry { enum PixelFormat pix_fmt; int overlay_fmt; } sdl_overlay_pix_fmt_map[] = { { PIX_FMT_YUV420P, SDL_IYUV_OVERLAY }, { PIX_FMT_YUYV422, SDL_YUY2_OVERLAY }, { PIX_FMT_UYVY422, SDL_UYVY_OVERLAY }, { PIX_FMT_NONE, 0 }, }; static int sdl_write_trailer(AVFormatContext *s) { SDLContext *sdl = s->priv_data; av_freep(&sdl->window_title); av_freep(&sdl->icon_title); av_freep(&sdl->window_size); if (sdl->overlay) { SDL_FreeYUVOverlay(sdl->overlay); sdl->overlay = NULL; } if (!sdl->sdl_was_already_inited) SDL_Quit(); return 0; } static int sdl_write_header(AVFormatContext *s) { SDLContext *sdl = s->priv_data; AVStream *st = s->streams[0]; AVCodecContext *encctx = st->codec; float sar, dar; /* sample and display aspect ratios */ int i, ret; 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 != 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 != 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; } if (sdl->window_size) { if (av_parse_video_size(&sdl->window_width, &sdl->window_height, sdl->window_size) < 0) { av_log(s, AV_LOG_ERROR, "Invalid window size '%s'\n", sdl->window_size); ret = AVERROR(EINVAL); goto fail; } } /* compute overlay width and height from the codec context information */ sar = st->sample_aspect_ratio.num ? av_q2d(st->sample_aspect_ratio) : 1; dar = sar * (float)encctx->width / (float)encctx->height; /* we suppose the screen has a 1/1 sample aspect ratio */ sdl->overlay_height = encctx->height; sdl->overlay_width = ((int)rint(sdl->overlay_height * dar)); if (sdl->overlay_width > encctx->width) { sdl->overlay_width = encctx->width; sdl->overlay_height = ((int)rint(sdl->overlay_width / dar)); } if (!sdl->window_width || !sdl->window_height) { sdl->window_width = sdl->overlay_width; sdl->window_height = sdl->overlay_height; } SDL_WM_SetCaption(sdl->window_title, sdl->icon_title); sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, 24, SDL_SWSURFACE); 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(sdl->overlay_width, sdl->overlay_height, sdl->overlay_fmt, sdl->surface); if (!sdl->overlay || sdl->overlay->pitches[0] < sdl->overlay_width) { av_log(s, AV_LOG_ERROR, "SDL does not support an overlay with size of %dx%d pixels.\n", sdl->overlay_width, sdl->overlay_height); ret = AVERROR(EINVAL); goto fail; } av_log(s, AV_LOG_INFO, "w:%d h:%d fmt:%s sar:%f -> w:%d h:%d\n", encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar, sdl->window_width, sdl->window_height); return 0; fail: sdl_write_trailer(s); return ret; } static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt) { SDLContext *sdl = s->priv_data; AVCodecContext *encctx = s->streams[0]->codec; SDL_Rect rect = { 0, 0, sdl->window_width, sdl->window_height }; AVPicture pict; int i; avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height); SDL_FillRect(sdl->surface, &sdl->surface->clip_rect, SDL_MapRGB(sdl->surface->format, 0, 0, 0)); SDL_LockYUVOverlay(sdl->overlay); for (i = 0; i < 3; i++) { sdl->overlay->pixels [i] = pict.data [i]; sdl->overlay->pitches[i] = pict.linesize[i]; } SDL_DisplayYUVOverlay(sdl->overlay, &rect); SDL_UnlockYUVOverlay(sdl->overlay); SDL_UpdateRect(sdl->surface, 0, 0, sdl->overlay_width, sdl->overlay_height); return 0; } #define OFFSET(x) offsetof(SDLContext,x) static const AVOption options[] = { { "window_title", "SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, { "icon_title", "SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, { "window_size", "SDL window forced size", OFFSET(window_size) , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, { NULL }, }; static const AVClass sdl_class = { .class_name = "sdl outdev", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; AVOutputFormat ff_sdl_muxer = { .name = "sdl", .long_name = NULL_IF_CONFIG_SMALL("SDL output device"), .priv_data_size = sizeof(SDLContext), .audio_codec = CODEC_ID_NONE, .video_codec = CODEC_ID_RAWVIDEO, .write_header = sdl_write_header, .write_packet = sdl_write_packet, .write_trailer = sdl_write_trailer, .flags = AVFMT_NOFILE, .priv_class = &sdl_class, };