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; /**< size of the window */
40 int overlay_width, overlay_height; /**< size of the video in the window */
41 int overlay_x, overlay_y;
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);
63 SDL_FreeYUVOverlay(sdl->overlay);
66 if (!sdl->sdl_was_already_inited)
72 static int sdl_write_header(AVFormatContext *s)
74 SDLContext *sdl = s->priv_data;
75 AVStream *st = s->streams[0];
76 AVCodecContext *encctx = st->codec;
77 AVRational sar, dar; /* sample and display aspect ratios */
80 if (!sdl->window_title)
81 sdl->window_title = av_strdup(s->filename);
83 sdl->icon_title = av_strdup(sdl->window_title);
85 if (SDL_WasInit(SDL_INIT_VIDEO)) {
86 av_log(s, AV_LOG_ERROR,
87 "SDL video subsystem was already inited, aborting.\n");
88 sdl->sdl_was_already_inited = 1;
89 ret = AVERROR(EINVAL);
93 if (SDL_Init(SDL_INIT_VIDEO) != 0) {
94 av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
95 ret = AVERROR(EINVAL);
99 if ( s->nb_streams > 1
100 || encctx->codec_type != AVMEDIA_TYPE_VIDEO
101 || encctx->codec_id != CODEC_ID_RAWVIDEO) {
102 av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
103 ret = AVERROR(EINVAL);
107 for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != PIX_FMT_NONE; i++) {
108 if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {
109 sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;
114 if (!sdl->overlay_fmt) {
115 av_log(s, AV_LOG_ERROR,
116 "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422.\n",
117 av_get_pix_fmt_name(encctx->pix_fmt));
118 ret = AVERROR(EINVAL);
122 /* compute overlay width and height from the codec context information */
123 sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
124 dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height });
126 /* we suppose the screen has a 1/1 sample aspect ratio */
127 if (sdl->window_width && sdl->window_height) {
128 /* fit in the window */
129 if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) {
131 sdl->overlay_width = sdl->window_width;
132 sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num);
135 sdl->overlay_height = sdl->window_height;
136 sdl->overlay_width = av_rescale(sdl->overlay_height, dar.num, dar.den);
139 if (sar.num > sar.den) {
140 sdl->overlay_width = encctx->width;
141 sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num);
143 sdl->overlay_height = encctx->height;
144 sdl->overlay_width = av_rescale(sdl->overlay_height, dar.num, dar.den);
146 sdl->window_width = sdl->overlay_width;
147 sdl->window_height = sdl->overlay_height;
149 sdl->overlay_x = (sdl->window_width - sdl->overlay_width ) / 2;
150 sdl->overlay_y = (sdl->window_height - sdl->overlay_height) / 2;
152 SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);
153 sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,
156 av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
157 ret = AVERROR(EINVAL);
161 sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height,
162 sdl->overlay_fmt, sdl->surface);
163 if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) {
164 av_log(s, AV_LOG_ERROR,
165 "SDL does not support an overlay with size of %dx%d pixels.\n",
166 encctx->width, encctx->height);
167 ret = AVERROR(EINVAL);
171 av_log(s, AV_LOG_INFO, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d\n",
172 encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar.num, sar.den,
173 sdl->overlay_width, sdl->overlay_height);
177 sdl_write_trailer(s);
181 static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt)
183 SDLContext *sdl = s->priv_data;
184 AVCodecContext *encctx = s->streams[0]->codec;
185 SDL_Rect rect = { sdl->overlay_x, sdl->overlay_y, sdl->overlay_width, sdl->overlay_height };
189 avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
191 SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,
192 SDL_MapRGB(sdl->surface->format, 0, 0, 0));
193 SDL_LockYUVOverlay(sdl->overlay);
194 for (i = 0; i < 3; i++) {
195 sdl->overlay->pixels [i] = pict.data [i];
196 sdl->overlay->pitches[i] = pict.linesize[i];
198 SDL_DisplayYUVOverlay(sdl->overlay, &rect);
199 SDL_UnlockYUVOverlay(sdl->overlay);
201 SDL_UpdateRect(sdl->surface, rect.x, rect.y, rect.w, rect.h);
206 #define OFFSET(x) offsetof(SDLContext,x)
208 static const AVOption options[] = {
209 { "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
210 { "icon_title", "set SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
211 { "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE,{.str=NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
215 static const AVClass sdl_class = {
216 .class_name = "sdl outdev",
217 .item_name = av_default_item_name,
219 .version = LIBAVUTIL_VERSION_INT,
222 AVOutputFormat ff_sdl_muxer = {
224 .long_name = NULL_IF_CONFIG_SMALL("SDL output device"),
225 .priv_data_size = sizeof(SDLContext),
226 .audio_codec = CODEC_ID_NONE,
227 .video_codec = CODEC_ID_RAWVIDEO,
228 .write_header = sdl_write_header,
229 .write_packet = sdl_write_packet,
230 .write_trailer = sdl_write_trailer,
231 .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
232 .priv_class = &sdl_class,