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https://github.com/FFmpeg/FFmpeg.git
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lavdev: add SDL output device
This commit is contained in:
Stefano Sabatini
228
libavdevice/sdl.c
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228
libavdevice/sdl.c
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/*
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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 "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 "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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char *window_size;
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int window_width, window_height;
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int overlay_width, overlay_height;
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int overlay_fmt;
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int sdl_was_already_inited;
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} SDLContext;
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struct sdl_overlay_pix_fmt_entry {
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enum PixelFormat pix_fmt; int overlay_fmt;
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} sdl_overlay_pix_fmt_map[] = {
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{ PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },
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{ PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },
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{ PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },
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{ 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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av_freep(&sdl->window_title);
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av_freep(&sdl->icon_title);
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av_freep(&sdl->window_size);
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if (sdl->overlay) {
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SDL_FreeYUVOverlay(sdl->overlay);
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sdl->overlay = NULL;
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}
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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 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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float sar, dar; /* sample and display aspect ratios */
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int i, ret;
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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 (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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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 != 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 != 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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if (sdl->window_size) {
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if (av_parse_video_size(&sdl->window_width, &sdl->window_height,
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sdl->window_size) < 0) {
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av_log(s, AV_LOG_ERROR, "Invalid window size '%s'\n", sdl->window_size);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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}
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/* compute overlay width and height from the codec context information */
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sar = st->sample_aspect_ratio.num ? av_q2d(st->sample_aspect_ratio) : 1;
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dar = sar * (float)encctx->width / (float)encctx->height;
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/* we suppose the screen has a 1/1 sample aspect ratio */
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sdl->overlay_height = encctx->height;
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sdl->overlay_width = ((int)rint(sdl->overlay_height * dar));
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if (sdl->overlay_width > encctx->width) {
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sdl->overlay_width = encctx->width;
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sdl->overlay_height = ((int)rint(sdl->overlay_width / dar));
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}
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if (!sdl->window_width || !sdl->window_height) {
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sdl->window_width = sdl->overlay_width;
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sdl->window_height = sdl->overlay_height;
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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, SDL_SWSURFACE);
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if (!sdl->surface) {
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av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
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ret = AVERROR(EINVAL);
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goto fail;
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}
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sdl->overlay = SDL_CreateYUVOverlay(sdl->overlay_width, sdl->overlay_height,
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sdl->overlay_fmt, sdl->surface);
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if (!sdl->overlay || sdl->overlay->pitches[0] < sdl->overlay_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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sdl->overlay_width, sdl->overlay_height);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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av_log(s, AV_LOG_INFO, "w:%d h:%d fmt:%s sar:%f -> w:%d h:%d\n",
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encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar,
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sdl->window_width, sdl->window_height);
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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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SDL_Rect rect = { 0, 0, sdl->window_width, sdl->window_height };
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AVPicture pict;
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int i;
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avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
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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, &rect);
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SDL_UnlockYUVOverlay(sdl->overlay);
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SDL_UpdateRect(sdl->surface, 0, 0, sdl->overlay_width, sdl->overlay_height);
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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", "SDL window title", OFFSET(window_title), FF_OPT_TYPE_STRING, {.str = "SDL video outdev" }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
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{ "icon_title", "SDL iconified window title", OFFSET(icon_title) , FF_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
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{ "window_size", "SDL window forced size", OFFSET(window_size) , FF_OPT_TYPE_STRING, {.str = NULL }, 0, 0, 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 = CODEC_ID_NONE,
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.video_codec = 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,
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.priv_class = &sdl_class,
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};
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