/* * 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 <SDL_thread.h> #include "libavutil/avstring.h" #include "libavutil/opt.h" #include "libavutil/parseutils.h" #include "libavutil/pixdesc.h" #include "libavutil/time.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; SDL_Rect overlay_rect; int overlay_fmt; int sdl_was_already_inited; SDL_Thread *event_thread; SDL_mutex *mutex; SDL_cond *init_cond; int init_ret; /* return code used to signal initialization errors */ int inited; int quit; } 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; sdl->quit = 1; if (sdl->overlay) SDL_FreeYUVOverlay(sdl->overlay); sdl->overlay = NULL; if (sdl->event_thread) SDL_WaitThread(sdl->event_thread, NULL); sdl->event_thread = NULL; if (sdl->mutex) SDL_DestroyMutex(sdl->mutex); sdl->mutex = NULL; if (sdl->init_cond) SDL_DestroyCond(sdl->init_cond); sdl->init_cond = NULL; if (!sdl->sdl_was_already_inited) SDL_Quit(); return 0; } static void compute_overlay_rect(AVFormatContext *s) { AVRational sar, dar; /* sample and display aspect ratios */ SDLContext *sdl = s->priv_data; AVStream *st = s->streams[0]; AVCodecContext *encctx = st->codec; SDL_Rect *overlay_rect = &sdl->overlay_rect; /* 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 */ overlay_rect->w = sdl->window_width; overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num); } else { /* fit in height */ overlay_rect->h = sdl->window_height; overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den); } } else { if (sar.num > sar.den) { overlay_rect->w = encctx->width; overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num); } else { overlay_rect->h = encctx->height; overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den); } sdl->window_width = overlay_rect->w; sdl->window_height = overlay_rect->h; } overlay_rect->x = (sdl->window_width - overlay_rect->w) / 2; overlay_rect->y = (sdl->window_height - overlay_rect->h) / 2; } #define SDL_BASE_FLAGS (SDL_SWSURFACE|SDL_RESIZABLE) static int event_thread(void *arg) { AVFormatContext *s = arg; SDLContext *sdl = s->priv_data; int flags = SDL_BASE_FLAGS | (sdl->window_fullscreen ? SDL_FULLSCREEN : 0); AVStream *st = s->streams[0]; AVCodecContext *encctx = st->codec; /* initialization */ if (SDL_Init(SDL_INIT_VIDEO) != 0) { av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError()); sdl->init_ret = AVERROR(EINVAL); goto init_end; } 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(sdl, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError()); sdl->init_ret = AVERROR(EINVAL); goto init_end; } 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); sdl->init_ret = AVERROR(EINVAL); goto init_end; } sdl->init_ret = 0; av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d\n", encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sdl->overlay_rect.w, sdl->overlay_rect.h); init_end: SDL_LockMutex(sdl->mutex); sdl->inited = 1; SDL_UnlockMutex(sdl->mutex); SDL_CondSignal(sdl->init_cond); if (sdl->init_ret < 0) return sdl->init_ret; /* event loop */ while (!sdl->quit) { int ret; SDL_Event event; SDL_PumpEvents(); ret = SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_ALLEVENTS); if (ret < 0) { av_log(s, AV_LOG_ERROR, "Error when getting SDL event: %s\n", SDL_GetError()); continue; } if (ret == 0) { SDL_Delay(10); continue; } switch (event.type) { case SDL_KEYDOWN: switch (event.key.keysym.sym) { case SDLK_ESCAPE: case SDLK_q: sdl->quit = 1; break; } break; case SDL_QUIT: sdl->quit = 1; break; case SDL_VIDEORESIZE: sdl->window_width = event.resize.w; sdl->window_height = event.resize.h; SDL_LockMutex(sdl->mutex); sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, 24, SDL_BASE_FLAGS); if (!sdl->surface) { av_log(s, AV_LOG_ERROR, "Failed to set SDL video mode: %s\n", SDL_GetError()); sdl->quit = 1; } else { compute_overlay_rect(s); } SDL_UnlockMutex(sdl->mutex); break; default: break; } } return 0; } static int sdl_write_header(AVFormatContext *s) { SDLContext *sdl = s->priv_data; AVStream *st = s->streams[0]; AVCodecContext *encctx = st->codec; 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 ( 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 */ compute_overlay_rect(s); sdl->init_cond = SDL_CreateCond(); if (!sdl->init_cond) { av_log(s, AV_LOG_ERROR, "Could not create SDL condition variable: %s\n", SDL_GetError()); ret = AVERROR_EXTERNAL; goto fail; } sdl->mutex = SDL_CreateMutex(); if (!sdl->mutex) { av_log(s, AV_LOG_ERROR, "Could not create SDL mutex: %s\n", SDL_GetError()); ret = AVERROR_EXTERNAL; goto fail; } sdl->event_thread = SDL_CreateThread(event_thread, s); if (!sdl->event_thread) { av_log(s, AV_LOG_ERROR, "Could not create SDL event thread: %s\n", SDL_GetError()); ret = AVERROR_EXTERNAL; goto fail; } /* wait until the video system has been inited */ SDL_LockMutex(sdl->mutex); while (!sdl->inited) { SDL_CondWait(sdl->init_cond, sdl->mutex); } SDL_UnlockMutex(sdl->mutex); if (sdl->init_ret < 0) { ret = sdl->init_ret; goto fail; } 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; AVPicture pict; int i; if (sdl->quit) { sdl_write_trailer(s); return AVERROR(EIO); } avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height); SDL_LockMutex(sdl->mutex); 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, &sdl->overlay_rect); SDL_UnlockYUVOverlay(sdl->overlay); SDL_UpdateRect(sdl->surface, sdl->overlay_rect.x, sdl->overlay_rect.y, sdl->overlay_rect.w, sdl->overlay_rect.h); SDL_UnlockMutex(sdl->mutex); 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, .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, }; 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, };