video_out_sdl.c

比较早的MPEG－2的解码源程序

/*
 * video_out_sdl.c
 *
 * Copyright (C) 2000-2003 Ryan C. Gordon <[e-mail]> and
 *                         Dominik Schnitzer <[e-mail]>
 *
 * SDL info, source, and binaries can be found at http://www.libsdl.org/
 *
 * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
 * See http://libmpeg2.sourceforge.net/ for updates.
 *
 * mpeg2dec is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * mpeg2dec 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"

#ifdef LIBVO_SDL

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <SDL/SDL.h>
#include <inttypes.h>

#include "video_out.h"

typedef struct {
    vo_instance_t vo;
    int width;
    int height;
    SDL_Surface * surface;
    Uint32 sdlflags;
    Uint8 bpp;
} sdl_instance_t;

static void sdl_setup_fbuf (vo_instance_t * _instance,
			    uint8_t ** buf, void ** id)
{
    sdl_instance_t * instance = (sdl_instance_t *) _instance;
    SDL_Overlay * overlay;

    *id = overlay = SDL_CreateYUVOverlay (instance->width, instance->height,
					  SDL_YV12_OVERLAY, instance->surface);
    buf[0] = overlay->pixels[0];
    buf[1] = overlay->pixels[2];
    buf[2] = overlay->pixels[1];
    if (((long)buf[0] & 15) || ((long)buf[1] & 15) || ((long)buf[2] & 15)) {
	fprintf (stderr, "Unaligned buffers. Anyone know how to fix this ?\n");
	exit (1);
    }
}

static void sdl_start_fbuf (vo_instance_t * instance,
			    uint8_t * const * buf, void * id)
{
    SDL_LockYUVOverlay ((SDL_Overlay *) id);
}

static void sdl_draw_frame (vo_instance_t * _instance,
			    uint8_t * const * buf, void * id)
{
    sdl_instance_t * instance = (sdl_instance_t *) _instance;
    SDL_Overlay * overlay = (SDL_Overlay *) id;
    SDL_Event event;

    while (SDL_PollEvent (&event))
	if (event.type == SDL_VIDEORESIZE)
	    instance->surface =
		SDL_SetVideoMode (event.resize.w, event.resize.h,
				  instance->bpp, instance->sdlflags);
    SDL_DisplayYUVOverlay (overlay, &(instance->surface->clip_rect));
}

static void sdl_discard (vo_instance_t * _instance,
			 uint8_t * const * buf, void * id)
{
    SDL_UnlockYUVOverlay ((SDL_Overlay *) id);
}

#if 0
static void sdl_close (vo_instance_t * _instance)
{
    sdl_instance_t * instance;
    int i;

    instance = (sdl_instance_t *) _instance;
    for (i = 0; i < 3; i++)
	SDL_FreeYUVOverlay (instance->frame[i].overlay);
    SDL_FreeSurface (instance->surface);
    SDL_QuitSubSystem (SDL_INIT_VIDEO);
}
#endif

static int sdl_setup (vo_instance_t * _instance, unsigned int width,
		      unsigned int height, unsigned int chroma_width,
		      unsigned int chroma_height, vo_setup_result_t * result)
{
    sdl_instance_t * instance;

    instance = (sdl_instance_t *) _instance;

    instance->width = width;
    instance->height = height;
    instance->surface = SDL_SetVideoMode (width, height, instance->bpp,
					  instance->sdlflags);
    if (! (instance->surface)) {
	fprintf (stderr, "sdl could not set the desired video mode\n");
	return 1;
    }

    result->convert = NULL;
    return 0;
}

vo_instance_t * vo_sdl_open (void)
{
    sdl_instance_t * instance;
    const SDL_VideoInfo * vidInfo;

    instance = (sdl_instance_t *) malloc (sizeof (sdl_instance_t));
    if (instance == NULL)
	return NULL;

    instance->vo.setup = sdl_setup;
    instance->vo.setup_fbuf = sdl_setup_fbuf;
    instance->vo.set_fbuf = NULL;
    instance->vo.start_fbuf = sdl_start_fbuf;
    instance->vo.discard = sdl_discard;
    instance->vo.draw = sdl_draw_frame;
    instance->vo.close = NULL; /* sdl_close; */
    instance->sdlflags = SDL_HWSURFACE | SDL_RESIZABLE;

    putenv("SDL_VIDEO_YUV_HWACCEL=1");
    putenv("SDL_VIDEO_X11_NODIRECTCOLOR=1");

    if (SDL_Init (SDL_INIT_VIDEO)) {
	fprintf (stderr, "sdl video initialization failed.\n");
	return NULL;
    }

    vidInfo = SDL_GetVideoInfo ();
    if (!SDL_ListModes (vidInfo->vfmt, SDL_HWSURFACE | SDL_RESIZABLE)) {
	instance->sdlflags = SDL_RESIZABLE;
	if (!SDL_ListModes (vidInfo->vfmt, SDL_RESIZABLE)) {
	    fprintf (stderr, "sdl couldn't get any acceptable video mode\n");
	    return NULL;
	}
    }
    instance->bpp = vidInfo->vfmt->BitsPerPixel;
    if (instance->bpp < 16) {
	fprintf(stderr, "sdl has to emulate a 16 bit surfaces, "
		"that will slow things down.\n");
	instance->bpp = 16;
    }

    return (vo_instance_t *) instance;
}
#endif