00001 /* 00002 * Copyright (c) 2011 Stefano Sabatini 00003 * 00004 * This file is part of FFmpeg. 00005 * 00006 * FFmpeg is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * FFmpeg is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with FFmpeg; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00026 #include <SDL.h> 00027 #include "libavutil/avstring.h" 00028 #include "libavutil/opt.h" 00029 #include "libavutil/parseutils.h" 00030 #include "libavutil/pixdesc.h" 00031 #include "avdevice.h" 00032 00033 typedef struct { 00034 AVClass *class; 00035 SDL_Surface *surface; 00036 SDL_Overlay *overlay; 00037 char *window_title; 00038 char *icon_title; 00039 int window_width, window_height; 00040 int overlay_width, overlay_height; 00041 int overlay_x, overlay_y; 00042 int overlay_fmt; 00043 int sdl_was_already_inited; 00044 } SDLContext; 00045 00046 static const struct sdl_overlay_pix_fmt_entry { 00047 enum PixelFormat pix_fmt; int overlay_fmt; 00048 } sdl_overlay_pix_fmt_map[] = { 00049 { PIX_FMT_YUV420P, SDL_IYUV_OVERLAY }, 00050 { PIX_FMT_YUYV422, SDL_YUY2_OVERLAY }, 00051 { PIX_FMT_UYVY422, SDL_UYVY_OVERLAY }, 00052 { PIX_FMT_NONE, 0 }, 00053 }; 00054 00055 static int sdl_write_trailer(AVFormatContext *s) 00056 { 00057 SDLContext *sdl = s->priv_data; 00058 00059 av_freep(&sdl->window_title); 00060 av_freep(&sdl->icon_title); 00061 00062 if (sdl->overlay) { 00063 SDL_FreeYUVOverlay(sdl->overlay); 00064 sdl->overlay = NULL; 00065 } 00066 if (!sdl->sdl_was_already_inited) 00067 SDL_Quit(); 00068 00069 return 0; 00070 } 00071 00072 static int sdl_write_header(AVFormatContext *s) 00073 { 00074 SDLContext *sdl = s->priv_data; 00075 AVStream *st = s->streams[0]; 00076 AVCodecContext *encctx = st->codec; 00077 AVRational sar, dar; /* sample and display aspect ratios */ 00078 int i, ret; 00079 00080 if (!sdl->window_title) 00081 sdl->window_title = av_strdup(s->filename); 00082 if (!sdl->icon_title) 00083 sdl->icon_title = av_strdup(sdl->window_title); 00084 00085 if (SDL_WasInit(SDL_INIT_VIDEO)) { 00086 av_log(s, AV_LOG_ERROR, 00087 "SDL video subsystem was already inited, aborting\n"); 00088 sdl->sdl_was_already_inited = 1; 00089 ret = AVERROR(EINVAL); 00090 goto fail; 00091 } 00092 00093 if (SDL_Init(SDL_INIT_VIDEO) != 0) { 00094 av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError()); 00095 ret = AVERROR(EINVAL); 00096 goto fail; 00097 } 00098 00099 if ( s->nb_streams > 1 00100 || encctx->codec_type != AVMEDIA_TYPE_VIDEO 00101 || encctx->codec_id != AV_CODEC_ID_RAWVIDEO) { 00102 av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n"); 00103 ret = AVERROR(EINVAL); 00104 goto fail; 00105 } 00106 00107 for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != PIX_FMT_NONE; i++) { 00108 if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) { 00109 sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt; 00110 break; 00111 } 00112 } 00113 00114 if (!sdl->overlay_fmt) { 00115 av_log(s, AV_LOG_ERROR, 00116 "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n", 00117 av_get_pix_fmt_name(encctx->pix_fmt)); 00118 ret = AVERROR(EINVAL); 00119 goto fail; 00120 } 00121 00122 /* compute overlay width and height from the codec context information */ 00123 sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 }; 00124 dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height }); 00125 00126 /* we suppose the screen has a 1/1 sample aspect ratio */ 00127 if (sdl->window_width && sdl->window_height) { 00128 /* fit in the window */ 00129 if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) { 00130 /* fit in width */ 00131 sdl->overlay_width = sdl->window_width; 00132 sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num); 00133 } else { 00134 /* fit in height */ 00135 sdl->overlay_height = sdl->window_height; 00136 sdl->overlay_width = av_rescale(sdl->overlay_height, dar.num, dar.den); 00137 } 00138 } else { 00139 if (sar.num > sar.den) { 00140 sdl->overlay_width = encctx->width; 00141 sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num); 00142 } else { 00143 sdl->overlay_height = encctx->height; 00144 sdl->overlay_width = av_rescale(sdl->overlay_height, dar.num, dar.den); 00145 } 00146 sdl->window_width = sdl->overlay_width; 00147 sdl->window_height = sdl->overlay_height; 00148 } 00149 sdl->overlay_x = (sdl->window_width - sdl->overlay_width ) / 2; 00150 sdl->overlay_y = (sdl->window_height - sdl->overlay_height) / 2; 00151 00152 SDL_WM_SetCaption(sdl->window_title, sdl->icon_title); 00153 sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, 00154 24, SDL_SWSURFACE); 00155 if (!sdl->surface) { 00156 av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError()); 00157 ret = AVERROR(EINVAL); 00158 goto fail; 00159 } 00160 00161 sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height, 00162 sdl->overlay_fmt, sdl->surface); 00163 if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) { 00164 av_log(s, AV_LOG_ERROR, 00165 "SDL does not support an overlay with size of %dx%d pixels\n", 00166 encctx->width, encctx->height); 00167 ret = AVERROR(EINVAL); 00168 goto fail; 00169 } 00170 00171 av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d\n", 00172 encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar.num, sar.den, 00173 sdl->overlay_width, sdl->overlay_height); 00174 return 0; 00175 00176 fail: 00177 sdl_write_trailer(s); 00178 return ret; 00179 } 00180 00181 static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt) 00182 { 00183 SDLContext *sdl = s->priv_data; 00184 AVCodecContext *encctx = s->streams[0]->codec; 00185 SDL_Rect rect = { sdl->overlay_x, sdl->overlay_y, sdl->overlay_width, sdl->overlay_height }; 00186 AVPicture pict; 00187 int i; 00188 00189 avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height); 00190 00191 SDL_FillRect(sdl->surface, &sdl->surface->clip_rect, 00192 SDL_MapRGB(sdl->surface->format, 0, 0, 0)); 00193 SDL_LockYUVOverlay(sdl->overlay); 00194 for (i = 0; i < 3; i++) { 00195 sdl->overlay->pixels [i] = pict.data [i]; 00196 sdl->overlay->pitches[i] = pict.linesize[i]; 00197 } 00198 SDL_DisplayYUVOverlay(sdl->overlay, &rect); 00199 SDL_UnlockYUVOverlay(sdl->overlay); 00200 00201 SDL_UpdateRect(sdl->surface, rect.x, rect.y, rect.w, rect.h); 00202 00203 return 0; 00204 } 00205 00206 #define OFFSET(x) offsetof(SDLContext,x) 00207 00208 static const AVOption options[] = { 00209 { "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, 00210 { "icon_title", "set SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, 00211 { "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE,{.str=NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, 00212 { NULL }, 00213 }; 00214 00215 static const AVClass sdl_class = { 00216 .class_name = "sdl outdev", 00217 .item_name = av_default_item_name, 00218 .option = options, 00219 .version = LIBAVUTIL_VERSION_INT, 00220 }; 00221 00222 AVOutputFormat ff_sdl_muxer = { 00223 .name = "sdl", 00224 .long_name = NULL_IF_CONFIG_SMALL("SDL output device"), 00225 .priv_data_size = sizeof(SDLContext), 00226 .audio_codec = AV_CODEC_ID_NONE, 00227 .video_codec = AV_CODEC_ID_RAWVIDEO, 00228 .write_header = sdl_write_header, 00229 .write_packet = sdl_write_packet, 00230 .write_trailer = sdl_write_trailer, 00231 .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS, 00232 .priv_class = &sdl_class, 00233 };