2 * Copyright (c) 2011 Stefano Sabatini
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * libSDL output device
27 #include "libavutil/avstring.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/parseutils.h"
30 #include "libavutil/pixdesc.h"
39 int window_width, window_height;
40 int overlay_width, overlay_height;
42 int sdl_was_already_inited;
45 static const struct sdl_overlay_pix_fmt_entry {
46 enum PixelFormat pix_fmt; int overlay_fmt;
47 } sdl_overlay_pix_fmt_map[] = {
48 { PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },
49 { PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },
50 { PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },
54 static int sdl_write_trailer(AVFormatContext *s)
56 SDLContext *sdl = s->priv_data;
58 av_freep(&sdl->window_title);
59 av_freep(&sdl->icon_title);
62 SDL_FreeYUVOverlay(sdl->overlay);
65 if (!sdl->sdl_was_already_inited)
71 static int sdl_write_header(AVFormatContext *s)
73 SDLContext *sdl = s->priv_data;
74 AVStream *st = s->streams[0];
75 AVCodecContext *encctx = st->codec;
76 float sar, dar; /* sample and display aspect ratios */
79 if (!sdl->window_title)
80 sdl->window_title = av_strdup(s->filename);
82 sdl->icon_title = av_strdup(sdl->window_title);
84 if (SDL_WasInit(SDL_INIT_VIDEO)) {
85 av_log(s, AV_LOG_ERROR,
86 "SDL video subsystem was already inited, aborting.\n");
87 sdl->sdl_was_already_inited = 1;
88 ret = AVERROR(EINVAL);
92 if (SDL_Init(SDL_INIT_VIDEO) != 0) {
93 av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
94 ret = AVERROR(EINVAL);
98 if ( s->nb_streams > 1
99 || encctx->codec_type != AVMEDIA_TYPE_VIDEO
100 || encctx->codec_id != CODEC_ID_RAWVIDEO) {
101 av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
102 ret = AVERROR(EINVAL);
106 for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != PIX_FMT_NONE; i++) {
107 if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {
108 sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;
113 if (!sdl->overlay_fmt) {
114 av_log(s, AV_LOG_ERROR,
115 "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422.\n",
116 av_get_pix_fmt_name(encctx->pix_fmt));
117 ret = AVERROR(EINVAL);
121 /* compute overlay width and height from the codec context information */
122 sar = st->sample_aspect_ratio.num ? av_q2d(st->sample_aspect_ratio) : 1;
123 dar = sar * (float)encctx->width / (float)encctx->height;
125 /* we suppose the screen has a 1/1 sample aspect ratio */
126 sdl->overlay_height = encctx->height;
127 sdl->overlay_width = ((int)rint(sdl->overlay_height * dar));
128 if (sdl->overlay_width > encctx->width) {
129 sdl->overlay_width = encctx->width;
130 sdl->overlay_height = ((int)rint(sdl->overlay_width / dar));
133 if (!sdl->window_width || !sdl->window_height) {
134 sdl->window_width = sdl->overlay_width;
135 sdl->window_height = sdl->overlay_height;
138 SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);
139 sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,
142 av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
143 ret = AVERROR(EINVAL);
147 sdl->overlay = SDL_CreateYUVOverlay(sdl->overlay_width, sdl->overlay_height,
148 sdl->overlay_fmt, sdl->surface);
149 if (!sdl->overlay || sdl->overlay->pitches[0] < sdl->overlay_width) {
150 av_log(s, AV_LOG_ERROR,
151 "SDL does not support an overlay with size of %dx%d pixels.\n",
152 sdl->overlay_width, sdl->overlay_height);
153 ret = AVERROR(EINVAL);
157 av_log(s, AV_LOG_INFO, "w:%d h:%d fmt:%s sar:%f -> w:%d h:%d\n",
158 encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar,
159 sdl->window_width, sdl->window_height);
163 sdl_write_trailer(s);
167 static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt)
169 SDLContext *sdl = s->priv_data;
170 AVCodecContext *encctx = s->streams[0]->codec;
171 SDL_Rect rect = { 0, 0, sdl->window_width, sdl->window_height };
175 avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
177 SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,
178 SDL_MapRGB(sdl->surface->format, 0, 0, 0));
179 SDL_LockYUVOverlay(sdl->overlay);
180 for (i = 0; i < 3; i++) {
181 sdl->overlay->pixels [i] = pict.data [i];
182 sdl->overlay->pitches[i] = pict.linesize[i];
184 SDL_DisplayYUVOverlay(sdl->overlay, &rect);
185 SDL_UnlockYUVOverlay(sdl->overlay);
187 SDL_UpdateRect(sdl->surface, 0, 0, sdl->overlay_width, sdl->overlay_height);
192 #define OFFSET(x) offsetof(SDLContext,x)
194 static const AVOption options[] = {
195 { "window_title", "SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
196 { "icon_title", "SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
197 { "window_size", "SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE,{.str=NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
201 static const AVClass sdl_class = {
202 .class_name = "sdl outdev",
203 .item_name = av_default_item_name,
205 .version = LIBAVUTIL_VERSION_INT,
208 AVOutputFormat ff_sdl_muxer = {
210 .long_name = NULL_IF_CONFIG_SMALL("SDL output device"),
211 .priv_data_size = sizeof(SDLContext),
212 .audio_codec = CODEC_ID_NONE,
213 .video_codec = CODEC_ID_RAWVIDEO,
214 .write_header = sdl_write_header,
215 .write_packet = sdl_write_packet,
216 .write_trailer = sdl_write_trailer,
217 .flags = AVFMT_NOFILE,
218 .priv_class = &sdl_class,