mirror of https://git.ffmpeg.org/ffmpeg.git
371 lines
12 KiB
C
371 lines
12 KiB
C
/*
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* Copyright (c) 2011 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* libSDL output device
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*/
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#include <SDL.h>
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#include <SDL_thread.h>
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/time.h"
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#include "avdevice.h"
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typedef struct {
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AVClass *class;
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SDL_Surface *surface;
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SDL_Overlay *overlay;
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char *window_title;
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char *icon_title;
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int window_width, window_height; /**< size of the window */
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int window_fullscreen;
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SDL_Rect overlay_rect;
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int overlay_fmt;
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int sdl_was_already_inited;
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SDL_Thread *event_thread;
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SDL_mutex *mutex;
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SDL_cond *init_cond;
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int init_ret; /* return code used to signal initialization errors */
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int inited;
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int quit;
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} SDLContext;
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static const struct sdl_overlay_pix_fmt_entry {
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enum AVPixelFormat pix_fmt; int overlay_fmt;
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} sdl_overlay_pix_fmt_map[] = {
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{ AV_PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },
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{ AV_PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },
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{ AV_PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },
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{ AV_PIX_FMT_NONE, 0 },
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};
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static int sdl_write_trailer(AVFormatContext *s)
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{
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SDLContext *sdl = s->priv_data;
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sdl->quit = 1;
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if (sdl->overlay)
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SDL_FreeYUVOverlay(sdl->overlay);
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if (sdl->event_thread)
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SDL_WaitThread(sdl->event_thread, NULL);
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if (sdl->mutex)
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SDL_DestroyMutex(sdl->mutex);
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if (sdl->init_cond)
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SDL_DestroyCond(sdl->init_cond);
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if (!sdl->sdl_was_already_inited)
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SDL_Quit();
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return 0;
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}
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static void compute_overlay_rect(AVFormatContext *s)
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{
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AVRational sar, dar; /* sample and display aspect ratios */
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SDLContext *sdl = s->priv_data;
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AVStream *st = s->streams[0];
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AVCodecContext *encctx = st->codec;
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SDL_Rect *overlay_rect = &sdl->overlay_rect;
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/* compute overlay width and height from the codec context information */
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sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
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dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height });
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/* we suppose the screen has a 1/1 sample aspect ratio */
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if (sdl->window_width && sdl->window_height) {
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/* fit in the window */
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if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) {
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/* fit in width */
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overlay_rect->w = sdl->window_width;
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overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num);
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} else {
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/* fit in height */
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overlay_rect->h = sdl->window_height;
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overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den);
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}
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} else {
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if (sar.num > sar.den) {
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overlay_rect->w = encctx->width;
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overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num);
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} else {
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overlay_rect->h = encctx->height;
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overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den);
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}
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sdl->window_width = overlay_rect->w;
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sdl->window_height = overlay_rect->h;
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}
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overlay_rect->x = (sdl->window_width - overlay_rect->w) / 2;
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overlay_rect->y = (sdl->window_height - overlay_rect->h) / 2;
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}
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#define SDL_BASE_FLAGS (SDL_SWSURFACE|SDL_RESIZABLE)
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static int event_thread(void *arg)
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{
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AVFormatContext *s = arg;
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SDLContext *sdl = s->priv_data;
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int flags = SDL_BASE_FLAGS | (sdl->window_fullscreen ? SDL_FULLSCREEN : 0);
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AVStream *st = s->streams[0];
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AVCodecContext *encctx = st->codec;
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/* initialization */
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if (SDL_Init(SDL_INIT_VIDEO) != 0) {
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av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
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sdl->init_ret = AVERROR(EINVAL);
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goto init_end;
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}
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SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);
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sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,
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24, flags);
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if (!sdl->surface) {
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av_log(sdl, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
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sdl->init_ret = AVERROR(EINVAL);
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goto init_end;
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}
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sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height,
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sdl->overlay_fmt, sdl->surface);
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if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) {
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av_log(s, AV_LOG_ERROR,
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"SDL does not support an overlay with size of %dx%d pixels\n",
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encctx->width, encctx->height);
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sdl->init_ret = AVERROR(EINVAL);
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goto init_end;
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}
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sdl->init_ret = 0;
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av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d\n",
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encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt),
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sdl->overlay_rect.w, sdl->overlay_rect.h);
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init_end:
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SDL_LockMutex(sdl->mutex);
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sdl->inited = 1;
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SDL_UnlockMutex(sdl->mutex);
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SDL_CondSignal(sdl->init_cond);
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if (sdl->init_ret < 0)
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return sdl->init_ret;
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/* event loop */
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while (!sdl->quit) {
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int ret;
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SDL_Event event;
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SDL_PumpEvents();
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ret = SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_ALLEVENTS);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Error when getting SDL event: %s\n", SDL_GetError());
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continue;
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}
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if (ret == 0) {
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SDL_Delay(10);
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continue;
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}
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switch (event.type) {
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case SDL_KEYDOWN:
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switch (event.key.keysym.sym) {
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case SDLK_ESCAPE:
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case SDLK_q:
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sdl->quit = 1;
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break;
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}
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break;
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case SDL_QUIT:
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sdl->quit = 1;
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break;
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case SDL_VIDEORESIZE:
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sdl->window_width = event.resize.w;
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sdl->window_height = event.resize.h;
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SDL_LockMutex(sdl->mutex);
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sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, 24, SDL_BASE_FLAGS);
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if (!sdl->surface) {
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av_log(s, AV_LOG_ERROR, "Failed to set SDL video mode: %s\n", SDL_GetError());
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sdl->quit = 1;
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} else {
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compute_overlay_rect(s);
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}
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SDL_UnlockMutex(sdl->mutex);
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break;
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default:
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break;
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}
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}
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return 0;
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}
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static int sdl_write_header(AVFormatContext *s)
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{
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SDLContext *sdl = s->priv_data;
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AVStream *st = s->streams[0];
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AVCodecContext *encctx = st->codec;
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int i, ret;
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if (!sdl->window_title)
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sdl->window_title = av_strdup(s->filename);
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if (!sdl->icon_title)
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sdl->icon_title = av_strdup(sdl->window_title);
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if (SDL_WasInit(SDL_INIT_VIDEO)) {
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av_log(s, AV_LOG_ERROR,
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"SDL video subsystem was already inited, aborting\n");
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sdl->sdl_was_already_inited = 1;
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ret = AVERROR(EINVAL);
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goto fail;
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}
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if ( s->nb_streams > 1
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|| encctx->codec_type != AVMEDIA_TYPE_VIDEO
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|| encctx->codec_id != AV_CODEC_ID_RAWVIDEO) {
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av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
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ret = AVERROR(EINVAL);
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goto fail;
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}
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for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != AV_PIX_FMT_NONE; i++) {
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if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {
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sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;
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break;
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}
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}
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if (!sdl->overlay_fmt) {
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av_log(s, AV_LOG_ERROR,
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"Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n",
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av_get_pix_fmt_name(encctx->pix_fmt));
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ret = AVERROR(EINVAL);
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goto fail;
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}
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/* compute overlay width and height from the codec context information */
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compute_overlay_rect(s);
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sdl->init_cond = SDL_CreateCond();
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if (!sdl->init_cond) {
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av_log(s, AV_LOG_ERROR, "Could not create SDL condition variable: %s\n", SDL_GetError());
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ret = AVERROR_EXTERNAL;
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goto fail;
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}
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sdl->mutex = SDL_CreateMutex();
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if (!sdl->mutex) {
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av_log(s, AV_LOG_ERROR, "Could not create SDL mutex: %s\n", SDL_GetError());
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ret = AVERROR_EXTERNAL;
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goto fail;
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}
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sdl->event_thread = SDL_CreateThread(event_thread, s);
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if (!sdl->event_thread) {
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av_log(s, AV_LOG_ERROR, "Could not create SDL event thread: %s\n", SDL_GetError());
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ret = AVERROR_EXTERNAL;
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goto fail;
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}
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/* wait until the video system has been inited */
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SDL_LockMutex(sdl->mutex);
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while (!sdl->inited) {
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SDL_CondWait(sdl->init_cond, sdl->mutex);
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}
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SDL_UnlockMutex(sdl->mutex);
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if (sdl->init_ret < 0) {
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ret = sdl->init_ret;
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goto fail;
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}
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return 0;
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fail:
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sdl_write_trailer(s);
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return ret;
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}
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static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SDLContext *sdl = s->priv_data;
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AVCodecContext *encctx = s->streams[0]->codec;
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AVPicture pict;
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int i;
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if (sdl->quit) {
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sdl_write_trailer(s);
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return AVERROR(EIO);
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}
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avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
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SDL_LockMutex(sdl->mutex);
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SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,
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SDL_MapRGB(sdl->surface->format, 0, 0, 0));
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SDL_LockYUVOverlay(sdl->overlay);
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for (i = 0; i < 3; i++) {
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sdl->overlay->pixels [i] = pict.data [i];
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sdl->overlay->pitches[i] = pict.linesize[i];
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}
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SDL_DisplayYUVOverlay(sdl->overlay, &sdl->overlay_rect);
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SDL_UnlockYUVOverlay(sdl->overlay);
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SDL_UpdateRect(sdl->surface,
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sdl->overlay_rect.x, sdl->overlay_rect.y,
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sdl->overlay_rect.w, sdl->overlay_rect.h);
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SDL_UnlockMutex(sdl->mutex);
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return 0;
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}
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#define OFFSET(x) offsetof(SDLContext,x)
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static const AVOption options[] = {
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{ "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
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{ "icon_title", "set SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
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{ "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
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{ "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
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{ NULL },
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};
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static const AVClass sdl_class = {
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.class_name = "sdl outdev",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVOutputFormat ff_sdl_muxer = {
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.name = "sdl",
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.long_name = NULL_IF_CONFIG_SMALL("SDL output device"),
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.priv_data_size = sizeof(SDLContext),
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.audio_codec = AV_CODEC_ID_NONE,
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.video_codec = AV_CODEC_ID_RAWVIDEO,
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.write_header = sdl_write_header,
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.write_packet = sdl_write_packet,
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.write_trailer = sdl_write_trailer,
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.flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
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.priv_class = &sdl_class,
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};
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