| /* |
| * 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; |
| int window_width, window_height; /**< size of the window */ |
| int window_fullscreen; |
| int overlay_width, overlay_height; /**< size of the video in the window */ |
| int overlay_x, overlay_y; |
| int overlay_fmt; |
| int sdl_was_already_inited; |
| } SDLContext; |
| |
| static const struct sdl_overlay_pix_fmt_entry { |
| enum AVPixelFormat pix_fmt; int overlay_fmt; |
| } sdl_overlay_pix_fmt_map[] = { |
| { AV_PIX_FMT_YUV420P, SDL_IYUV_OVERLAY }, |
| { AV_PIX_FMT_YUYV422, SDL_YUY2_OVERLAY }, |
| { AV_PIX_FMT_UYVY422, SDL_UYVY_OVERLAY }, |
| { AV_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); |
| |
| 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; |
| 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; |
| } |
| |
| static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| SDLContext *sdl = s->priv_data; |
| AVCodecContext *encctx = s->streams[0]->codec; |
| SDL_Rect rect = { sdl->overlay_x, sdl->overlay_y, sdl->overlay_width, sdl->overlay_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, rect.x, rect.y, rect.w, rect.h); |
| |
| return 0; |
| } |
| |
| #define OFFSET(x) offsetof(SDLContext,x) |
| |
| static const AVOption options[] = { |
| { "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, |
| { "icon_title", "set SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, |
| { "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE,{.str=NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, |
| { "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_INT,{.i64=0}, INT_MIN, INT_MAX, 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 = AV_CODEC_ID_NONE, |
| .video_codec = AV_CODEC_ID_RAWVIDEO, |
| .write_header = sdl_write_header, |
| .write_packet = sdl_write_packet, |
| .write_trailer = sdl_write_trailer, |
| .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS, |
| .priv_class = &sdl_class, |
| }; |