yading@10: /*
yading@10:  * Copyright (c) 2011 Stefano Sabatini
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * libSDL output device
yading@10:  */
yading@10: 
yading@10: #include <SDL.h>
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/parseutils.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "avdevice.h"
yading@10: 
yading@10: typedef struct {
yading@10:     AVClass *class;
yading@10:     SDL_Surface *surface;
yading@10:     SDL_Overlay *overlay;
yading@10:     char *window_title;
yading@10:     char *icon_title;
yading@10:     int window_width,  window_height;  /**< size of the window */
yading@10:     int window_fullscreen;
yading@10:     int overlay_width, overlay_height; /**< size of the video in the window */
yading@10:     int overlay_x, overlay_y;
yading@10:     int overlay_fmt;
yading@10:     int sdl_was_already_inited;
yading@10: } SDLContext;
yading@10: 
yading@10: static const struct sdl_overlay_pix_fmt_entry {
yading@10:     enum AVPixelFormat pix_fmt; int overlay_fmt;
yading@10: } sdl_overlay_pix_fmt_map[] = {
yading@10:     { AV_PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },
yading@10:     { AV_PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },
yading@10:     { AV_PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },
yading@10:     { AV_PIX_FMT_NONE,    0                },
yading@10: };
yading@10: 
yading@10: static int sdl_write_trailer(AVFormatContext *s)
yading@10: {
yading@10:     SDLContext *sdl = s->priv_data;
yading@10: 
yading@10:     av_freep(&sdl->window_title);
yading@10:     av_freep(&sdl->icon_title);
yading@10: 
yading@10:     if (sdl->overlay) {
yading@10:         SDL_FreeYUVOverlay(sdl->overlay);
yading@10:         sdl->overlay = NULL;
yading@10:     }
yading@10:     if (!sdl->sdl_was_already_inited)
yading@10:         SDL_Quit();
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int sdl_write_header(AVFormatContext *s)
yading@10: {
yading@10:     SDLContext *sdl = s->priv_data;
yading@10:     AVStream *st = s->streams[0];
yading@10:     AVCodecContext *encctx = st->codec;
yading@10:     AVRational sar, dar; /* sample and display aspect ratios */
yading@10:     int i, ret;
yading@10:     int flags = SDL_SWSURFACE | sdl->window_fullscreen ? SDL_FULLSCREEN : 0;
yading@10: 
yading@10:     if (!sdl->window_title)
yading@10:         sdl->window_title = av_strdup(s->filename);
yading@10:     if (!sdl->icon_title)
yading@10:         sdl->icon_title = av_strdup(sdl->window_title);
yading@10: 
yading@10:     if (SDL_WasInit(SDL_INIT_VIDEO)) {
yading@10:         av_log(s, AV_LOG_ERROR,
yading@10:                "SDL video subsystem was already inited, aborting\n");
yading@10:         sdl->sdl_was_already_inited = 1;
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     if (SDL_Init(SDL_INIT_VIDEO) != 0) {
yading@10:         av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     if (   s->nb_streams > 1
yading@10:         || encctx->codec_type != AVMEDIA_TYPE_VIDEO
yading@10:         || encctx->codec_id   != AV_CODEC_ID_RAWVIDEO) {
yading@10:         av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != AV_PIX_FMT_NONE; i++) {
yading@10:         if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {
yading@10:             sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;
yading@10:             break;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (!sdl->overlay_fmt) {
yading@10:         av_log(s, AV_LOG_ERROR,
yading@10:                "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n",
yading@10:                av_get_pix_fmt_name(encctx->pix_fmt));
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     /* compute overlay width and height from the codec context information */
yading@10:     sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
yading@10:     dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height });
yading@10: 
yading@10:     /* we suppose the screen has a 1/1 sample aspect ratio */
yading@10:     if (sdl->window_width && sdl->window_height) {
yading@10:         /* fit in the window */
yading@10:         if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) {
yading@10:             /* fit in width */
yading@10:             sdl->overlay_width  = sdl->window_width;
yading@10:             sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num);
yading@10:         } else {
yading@10:             /* fit in height */
yading@10:             sdl->overlay_height = sdl->window_height;
yading@10:             sdl->overlay_width  = av_rescale(sdl->overlay_height, dar.num, dar.den);
yading@10:         }
yading@10:     } else {
yading@10:         if (sar.num > sar.den) {
yading@10:             sdl->overlay_width  = encctx->width;
yading@10:             sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num);
yading@10:         } else {
yading@10:             sdl->overlay_height = encctx->height;
yading@10:             sdl->overlay_width  = av_rescale(sdl->overlay_height, dar.num, dar.den);
yading@10:         }
yading@10:         sdl->window_width  = sdl->overlay_width;
yading@10:         sdl->window_height = sdl->overlay_height;
yading@10:     }
yading@10:     sdl->overlay_x = (sdl->window_width  - sdl->overlay_width ) / 2;
yading@10:     sdl->overlay_y = (sdl->window_height - sdl->overlay_height) / 2;
yading@10: 
yading@10:     SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);
yading@10:     sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,
yading@10:                                     24, flags);
yading@10:     if (!sdl->surface) {
yading@10:         av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height,
yading@10:                                         sdl->overlay_fmt, sdl->surface);
yading@10:     if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) {
yading@10:         av_log(s, AV_LOG_ERROR,
yading@10:                "SDL does not support an overlay with size of %dx%d pixels\n",
yading@10:                encctx->width, encctx->height);
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d\n",
yading@10:            encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar.num, sar.den,
yading@10:            sdl->overlay_width, sdl->overlay_height);
yading@10:     return 0;
yading@10: 
yading@10: fail:
yading@10:     sdl_write_trailer(s);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt)
yading@10: {
yading@10:     SDLContext *sdl = s->priv_data;
yading@10:     AVCodecContext *encctx = s->streams[0]->codec;
yading@10:     SDL_Rect rect = { sdl->overlay_x, sdl->overlay_y, sdl->overlay_width, sdl->overlay_height };
yading@10:     AVPicture pict;
yading@10:     int i;
yading@10: 
yading@10:     avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
yading@10: 
yading@10:     SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,
yading@10:                  SDL_MapRGB(sdl->surface->format, 0, 0, 0));
yading@10:     SDL_LockYUVOverlay(sdl->overlay);
yading@10:     for (i = 0; i < 3; i++) {
yading@10:         sdl->overlay->pixels [i] = pict.data    [i];
yading@10:         sdl->overlay->pitches[i] = pict.linesize[i];
yading@10:     }
yading@10:     SDL_DisplayYUVOverlay(sdl->overlay, &rect);
yading@10:     SDL_UnlockYUVOverlay(sdl->overlay);
yading@10: 
yading@10:     SDL_UpdateRect(sdl->surface, rect.x, rect.y, rect.w, rect.h);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(SDLContext,x)
yading@10: 
yading@10: static const AVOption options[] = {
yading@10:     { "window_title", "set SDL window title",           OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
yading@10:     { "icon_title",   "set SDL iconified window title", OFFSET(icon_title)  , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
yading@10:     { "window_size",  "set SDL window forced size",     OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE,{.str=NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
yading@10:     { "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_INT,{.i64=0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static const AVClass sdl_class = {
yading@10:     .class_name = "sdl outdev",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVOutputFormat ff_sdl_muxer = {
yading@10:     .name           = "sdl",
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("SDL output device"),
yading@10:     .priv_data_size = sizeof(SDLContext),
yading@10:     .audio_codec    = AV_CODEC_ID_NONE,
yading@10:     .video_codec    = AV_CODEC_ID_RAWVIDEO,
yading@10:     .write_header   = sdl_write_header,
yading@10:     .write_packet   = sdl_write_packet,
yading@10:     .write_trailer  = sdl_write_trailer,
yading@10:     .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
yading@10:     .priv_class     = &sdl_class,
yading@10: };