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"
40 int window_width, window_height;
41 int overlay_width, overlay_height;
43 int sdl_was_already_inited;
46 static const struct sdl_overlay_pix_fmt_entry {
47 enum PixelFormat pix_fmt; int overlay_fmt;
48 } sdl_overlay_pix_fmt_map[] = {
49 { PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },
50 { PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },
51 { PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },
55 static int sdl_write_trailer(AVFormatContext *s)
57 SDLContext *sdl = s->priv_data;
59 av_freep(&sdl->window_title);
60 av_freep(&sdl->icon_title);
61 av_freep(&sdl->window_size);
64 SDL_FreeYUVOverlay(sdl->overlay);
67 if (!sdl->sdl_was_already_inited)
73 static int sdl_write_header(AVFormatContext *s)
75 SDLContext *sdl = s->priv_data;
76 AVStream *st = s->streams[0];
77 AVCodecContext *encctx = st->codec;
78 float sar, dar; /* sample and display aspect ratios */
81 if (!sdl->window_title)
82 sdl->window_title = av_strdup(s->filename);
84 sdl->icon_title = av_strdup(sdl->window_title);
86 if (SDL_WasInit(SDL_INIT_VIDEO)) {
87 av_log(s, AV_LOG_ERROR,
88 "SDL video subsystem was already inited, aborting.\n");
89 sdl->sdl_was_already_inited = 1;
90 ret = AVERROR(EINVAL);
94 if (SDL_Init(SDL_INIT_VIDEO) != 0) {
95 av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
96 ret = AVERROR(EINVAL);
100 if ( s->nb_streams > 1
101 || encctx->codec_type != AVMEDIA_TYPE_VIDEO
102 || encctx->codec_id != CODEC_ID_RAWVIDEO) {
103 av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
104 ret = AVERROR(EINVAL);
108 for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != PIX_FMT_NONE; i++) {
109 if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {
110 sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;
115 if (!sdl->overlay_fmt) {
116 av_log(s, AV_LOG_ERROR,
117 "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422.\n",
118 av_get_pix_fmt_name(encctx->pix_fmt));
119 ret = AVERROR(EINVAL);
123 if (sdl->window_size) {
124 if (av_parse_video_size(&sdl->window_width, &sdl->window_height,
125 sdl->window_size) < 0) {
126 av_log(s, AV_LOG_ERROR, "Invalid window size '%s'\n", sdl->window_size);
127 ret = AVERROR(EINVAL);
132 /* compute overlay width and height from the codec context information */
133 sar = st->sample_aspect_ratio.num ? av_q2d(st->sample_aspect_ratio) : 1;
134 dar = sar * (float)encctx->width / (float)encctx->height;
136 /* we suppose the screen has a 1/1 sample aspect ratio */
137 sdl->overlay_height = encctx->height;
138 sdl->overlay_width = ((int)rint(sdl->overlay_height * dar));
139 if (sdl->overlay_width > encctx->width) {
140 sdl->overlay_width = encctx->width;
141 sdl->overlay_height = ((int)rint(sdl->overlay_width / dar));
144 if (!sdl->window_width || !sdl->window_height) {
145 sdl->window_width = sdl->overlay_width;
146 sdl->window_height = sdl->overlay_height;
149 SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);
150 sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,
153 av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
154 ret = AVERROR(EINVAL);
158 sdl->overlay = SDL_CreateYUVOverlay(sdl->overlay_width, sdl->overlay_height,
159 sdl->overlay_fmt, sdl->surface);
160 if (!sdl->overlay || sdl->overlay->pitches[0] < sdl->overlay_width) {
161 av_log(s, AV_LOG_ERROR,
162 "SDL does not support an overlay with size of %dx%d pixels.\n",
163 sdl->overlay_width, sdl->overlay_height);
164 ret = AVERROR(EINVAL);
168 av_log(s, AV_LOG_INFO, "w:%d h:%d fmt:%s sar:%f -> w:%d h:%d\n",
169 encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar,
170 sdl->window_width, sdl->window_height);
174 sdl_write_trailer(s);
178 static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt)
180 SDLContext *sdl = s->priv_data;
181 AVCodecContext *encctx = s->streams[0]->codec;
182 SDL_Rect rect = { 0, 0, sdl->window_width, sdl->window_height };
186 avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
188 SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,
189 SDL_MapRGB(sdl->surface->format, 0, 0, 0));
190 SDL_LockYUVOverlay(sdl->overlay);
191 for (i = 0; i < 3; i++) {
192 sdl->overlay->pixels [i] = pict.data [i];
193 sdl->overlay->pitches[i] = pict.linesize[i];
195 SDL_DisplayYUVOverlay(sdl->overlay, &rect);
196 SDL_UnlockYUVOverlay(sdl->overlay);
198 SDL_UpdateRect(sdl->surface, 0, 0, sdl->overlay_width, sdl->overlay_height);
203 #define OFFSET(x) offsetof(SDLContext,x)
205 static const AVOption options[] = {
206 { "window_title", "SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
207 { "icon_title", "SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
208 { "window_size", "SDL window forced size", OFFSET(window_size) , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
212 static const AVClass sdl_class = {
213 .class_name = "sdl outdev",
214 .item_name = av_default_item_name,
216 .version = LIBAVUTIL_VERSION_INT,
219 AVOutputFormat ff_sdl_muxer = {
221 .long_name = NULL_IF_CONFIG_SMALL("SDL output device"),
222 .priv_data_size = sizeof(SDLContext),
223 .audio_codec = CODEC_ID_NONE,
224 .video_codec = CODEC_ID_RAWVIDEO,
225 .write_header = sdl_write_header,
226 .write_packet = sdl_write_packet,
227 .write_trailer = sdl_write_trailer,
228 .flags = AVFMT_NOFILE,
229 .priv_class = &sdl_class,