| 1 | /* |
| 2 | * Copyright (c) 2011 Stefano Sabatini |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 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. |
| 10 | * |
| 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. |
| 15 | * |
| 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 |
| 19 | */ |
| 20 | |
| 21 | /** |
| 22 | * @file |
| 23 | * libSDL output device |
| 24 | */ |
| 25 | |
| 26 | #include <SDL.h> |
| 27 | #include <SDL_thread.h> |
| 28 | |
| 29 | #include "libavutil/avstring.h" |
| 30 | #include "libavutil/opt.h" |
| 31 | #include "libavutil/parseutils.h" |
| 32 | #include "libavutil/pixdesc.h" |
| 33 | #include "libavutil/time.h" |
| 34 | #include "avdevice.h" |
| 35 | |
| 36 | typedef struct { |
| 37 | AVClass *class; |
| 38 | SDL_Surface *surface; |
| 39 | SDL_Overlay *overlay; |
| 40 | char *window_title; |
| 41 | char *icon_title; |
| 42 | int window_width, window_height; /**< size of the window */ |
| 43 | int window_fullscreen; |
| 44 | |
| 45 | SDL_Rect overlay_rect; |
| 46 | int overlay_fmt; |
| 47 | |
| 48 | int sdl_was_already_inited; |
| 49 | SDL_Thread *event_thread; |
| 50 | SDL_mutex *mutex; |
| 51 | SDL_cond *init_cond; |
| 52 | int init_ret; /* return code used to signal initialization errors */ |
| 53 | int inited; |
| 54 | int quit; |
| 55 | } SDLContext; |
| 56 | |
| 57 | static const struct sdl_overlay_pix_fmt_entry { |
| 58 | enum AVPixelFormat pix_fmt; int overlay_fmt; |
| 59 | } sdl_overlay_pix_fmt_map[] = { |
| 60 | { AV_PIX_FMT_YUV420P, SDL_IYUV_OVERLAY }, |
| 61 | { AV_PIX_FMT_YUYV422, SDL_YUY2_OVERLAY }, |
| 62 | { AV_PIX_FMT_UYVY422, SDL_UYVY_OVERLAY }, |
| 63 | { AV_PIX_FMT_NONE, 0 }, |
| 64 | }; |
| 65 | |
| 66 | static int sdl_write_trailer(AVFormatContext *s) |
| 67 | { |
| 68 | SDLContext *sdl = s->priv_data; |
| 69 | |
| 70 | sdl->quit = 1; |
| 71 | |
| 72 | if (sdl->overlay) |
| 73 | SDL_FreeYUVOverlay(sdl->overlay); |
| 74 | sdl->overlay = NULL; |
| 75 | if (sdl->event_thread) |
| 76 | SDL_WaitThread(sdl->event_thread, NULL); |
| 77 | sdl->event_thread = NULL; |
| 78 | if (sdl->mutex) |
| 79 | SDL_DestroyMutex(sdl->mutex); |
| 80 | sdl->mutex = NULL; |
| 81 | if (sdl->init_cond) |
| 82 | SDL_DestroyCond(sdl->init_cond); |
| 83 | sdl->init_cond = NULL; |
| 84 | |
| 85 | if (!sdl->sdl_was_already_inited) |
| 86 | SDL_Quit(); |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static void compute_overlay_rect(AVFormatContext *s) |
| 92 | { |
| 93 | AVRational sar, dar; /* sample and display aspect ratios */ |
| 94 | SDLContext *sdl = s->priv_data; |
| 95 | AVStream *st = s->streams[0]; |
| 96 | AVCodecContext *encctx = st->codec; |
| 97 | SDL_Rect *overlay_rect = &sdl->overlay_rect; |
| 98 | |
| 99 | /* compute overlay width and height from the codec context information */ |
| 100 | sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 }; |
| 101 | dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height }); |
| 102 | |
| 103 | /* we suppose the screen has a 1/1 sample aspect ratio */ |
| 104 | if (sdl->window_width && sdl->window_height) { |
| 105 | /* fit in the window */ |
| 106 | if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) { |
| 107 | /* fit in width */ |
| 108 | overlay_rect->w = sdl->window_width; |
| 109 | overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num); |
| 110 | } else { |
| 111 | /* fit in height */ |
| 112 | overlay_rect->h = sdl->window_height; |
| 113 | overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den); |
| 114 | } |
| 115 | } else { |
| 116 | if (sar.num > sar.den) { |
| 117 | overlay_rect->w = encctx->width; |
| 118 | overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num); |
| 119 | } else { |
| 120 | overlay_rect->h = encctx->height; |
| 121 | overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den); |
| 122 | } |
| 123 | sdl->window_width = overlay_rect->w; |
| 124 | sdl->window_height = overlay_rect->h; |
| 125 | } |
| 126 | |
| 127 | overlay_rect->x = (sdl->window_width - overlay_rect->w) / 2; |
| 128 | overlay_rect->y = (sdl->window_height - overlay_rect->h) / 2; |
| 129 | } |
| 130 | |
| 131 | #define SDL_BASE_FLAGS (SDL_SWSURFACE|SDL_RESIZABLE) |
| 132 | |
| 133 | static int event_thread(void *arg) |
| 134 | { |
| 135 | AVFormatContext *s = arg; |
| 136 | SDLContext *sdl = s->priv_data; |
| 137 | int flags = SDL_BASE_FLAGS | (sdl->window_fullscreen ? SDL_FULLSCREEN : 0); |
| 138 | AVStream *st = s->streams[0]; |
| 139 | AVCodecContext *encctx = st->codec; |
| 140 | |
| 141 | /* initialization */ |
| 142 | if (SDL_Init(SDL_INIT_VIDEO) != 0) { |
| 143 | av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError()); |
| 144 | sdl->init_ret = AVERROR(EINVAL); |
| 145 | goto init_end; |
| 146 | } |
| 147 | |
| 148 | SDL_WM_SetCaption(sdl->window_title, sdl->icon_title); |
| 149 | sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, |
| 150 | 24, flags); |
| 151 | if (!sdl->surface) { |
| 152 | av_log(sdl, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError()); |
| 153 | sdl->init_ret = AVERROR(EINVAL); |
| 154 | goto init_end; |
| 155 | } |
| 156 | |
| 157 | sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height, |
| 158 | sdl->overlay_fmt, sdl->surface); |
| 159 | if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) { |
| 160 | av_log(s, AV_LOG_ERROR, |
| 161 | "SDL does not support an overlay with size of %dx%d pixels\n", |
| 162 | encctx->width, encctx->height); |
| 163 | sdl->init_ret = AVERROR(EINVAL); |
| 164 | goto init_end; |
| 165 | } |
| 166 | |
| 167 | sdl->init_ret = 0; |
| 168 | av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d\n", |
| 169 | encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), |
| 170 | sdl->overlay_rect.w, sdl->overlay_rect.h); |
| 171 | |
| 172 | init_end: |
| 173 | SDL_LockMutex(sdl->mutex); |
| 174 | sdl->inited = 1; |
| 175 | SDL_UnlockMutex(sdl->mutex); |
| 176 | SDL_CondSignal(sdl->init_cond); |
| 177 | |
| 178 | if (sdl->init_ret < 0) |
| 179 | return sdl->init_ret; |
| 180 | |
| 181 | /* event loop */ |
| 182 | while (!sdl->quit) { |
| 183 | int ret; |
| 184 | SDL_Event event; |
| 185 | SDL_PumpEvents(); |
| 186 | ret = SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_ALLEVENTS); |
| 187 | if (ret < 0) { |
| 188 | av_log(s, AV_LOG_ERROR, "Error when getting SDL event: %s\n", SDL_GetError()); |
| 189 | continue; |
| 190 | } |
| 191 | if (ret == 0) { |
| 192 | SDL_Delay(10); |
| 193 | continue; |
| 194 | } |
| 195 | |
| 196 | switch (event.type) { |
| 197 | case SDL_KEYDOWN: |
| 198 | switch (event.key.keysym.sym) { |
| 199 | case SDLK_ESCAPE: |
| 200 | case SDLK_q: |
| 201 | sdl->quit = 1; |
| 202 | break; |
| 203 | } |
| 204 | break; |
| 205 | case SDL_QUIT: |
| 206 | sdl->quit = 1; |
| 207 | break; |
| 208 | |
| 209 | case SDL_VIDEORESIZE: |
| 210 | sdl->window_width = event.resize.w; |
| 211 | sdl->window_height = event.resize.h; |
| 212 | |
| 213 | SDL_LockMutex(sdl->mutex); |
| 214 | sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, 24, SDL_BASE_FLAGS); |
| 215 | if (!sdl->surface) { |
| 216 | av_log(s, AV_LOG_ERROR, "Failed to set SDL video mode: %s\n", SDL_GetError()); |
| 217 | sdl->quit = 1; |
| 218 | } else { |
| 219 | compute_overlay_rect(s); |
| 220 | } |
| 221 | SDL_UnlockMutex(sdl->mutex); |
| 222 | break; |
| 223 | |
| 224 | default: |
| 225 | break; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static int sdl_write_header(AVFormatContext *s) |
| 233 | { |
| 234 | SDLContext *sdl = s->priv_data; |
| 235 | AVStream *st = s->streams[0]; |
| 236 | AVCodecContext *encctx = st->codec; |
| 237 | int i, ret; |
| 238 | |
| 239 | if (!sdl->window_title) |
| 240 | sdl->window_title = av_strdup(s->filename); |
| 241 | if (!sdl->icon_title) |
| 242 | sdl->icon_title = av_strdup(sdl->window_title); |
| 243 | |
| 244 | if (SDL_WasInit(SDL_INIT_VIDEO)) { |
| 245 | av_log(s, AV_LOG_ERROR, |
| 246 | "SDL video subsystem was already inited, aborting\n"); |
| 247 | sdl->sdl_was_already_inited = 1; |
| 248 | ret = AVERROR(EINVAL); |
| 249 | goto fail; |
| 250 | } |
| 251 | |
| 252 | if ( s->nb_streams > 1 |
| 253 | || encctx->codec_type != AVMEDIA_TYPE_VIDEO |
| 254 | || encctx->codec_id != AV_CODEC_ID_RAWVIDEO) { |
| 255 | av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n"); |
| 256 | ret = AVERROR(EINVAL); |
| 257 | goto fail; |
| 258 | } |
| 259 | |
| 260 | for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != AV_PIX_FMT_NONE; i++) { |
| 261 | if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) { |
| 262 | sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt; |
| 263 | break; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | if (!sdl->overlay_fmt) { |
| 268 | av_log(s, AV_LOG_ERROR, |
| 269 | "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n", |
| 270 | av_get_pix_fmt_name(encctx->pix_fmt)); |
| 271 | ret = AVERROR(EINVAL); |
| 272 | goto fail; |
| 273 | } |
| 274 | |
| 275 | /* compute overlay width and height from the codec context information */ |
| 276 | compute_overlay_rect(s); |
| 277 | |
| 278 | sdl->init_cond = SDL_CreateCond(); |
| 279 | if (!sdl->init_cond) { |
| 280 | av_log(s, AV_LOG_ERROR, "Could not create SDL condition variable: %s\n", SDL_GetError()); |
| 281 | ret = AVERROR_EXTERNAL; |
| 282 | goto fail; |
| 283 | } |
| 284 | sdl->mutex = SDL_CreateMutex(); |
| 285 | if (!sdl->mutex) { |
| 286 | av_log(s, AV_LOG_ERROR, "Could not create SDL mutex: %s\n", SDL_GetError()); |
| 287 | ret = AVERROR_EXTERNAL; |
| 288 | goto fail; |
| 289 | } |
| 290 | sdl->event_thread = SDL_CreateThread(event_thread, s); |
| 291 | if (!sdl->event_thread) { |
| 292 | av_log(s, AV_LOG_ERROR, "Could not create SDL event thread: %s\n", SDL_GetError()); |
| 293 | ret = AVERROR_EXTERNAL; |
| 294 | goto fail; |
| 295 | } |
| 296 | |
| 297 | /* wait until the video system has been inited */ |
| 298 | SDL_LockMutex(sdl->mutex); |
| 299 | while (!sdl->inited) { |
| 300 | SDL_CondWait(sdl->init_cond, sdl->mutex); |
| 301 | } |
| 302 | SDL_UnlockMutex(sdl->mutex); |
| 303 | if (sdl->init_ret < 0) { |
| 304 | ret = sdl->init_ret; |
| 305 | goto fail; |
| 306 | } |
| 307 | return 0; |
| 308 | |
| 309 | fail: |
| 310 | sdl_write_trailer(s); |
| 311 | return ret; |
| 312 | } |
| 313 | |
| 314 | static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt) |
| 315 | { |
| 316 | SDLContext *sdl = s->priv_data; |
| 317 | AVCodecContext *encctx = s->streams[0]->codec; |
| 318 | AVPicture pict; |
| 319 | int i; |
| 320 | |
| 321 | if (sdl->quit) { |
| 322 | sdl_write_trailer(s); |
| 323 | return AVERROR(EIO); |
| 324 | } |
| 325 | avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height); |
| 326 | |
| 327 | SDL_LockMutex(sdl->mutex); |
| 328 | SDL_FillRect(sdl->surface, &sdl->surface->clip_rect, |
| 329 | SDL_MapRGB(sdl->surface->format, 0, 0, 0)); |
| 330 | SDL_LockYUVOverlay(sdl->overlay); |
| 331 | for (i = 0; i < 3; i++) { |
| 332 | sdl->overlay->pixels [i] = pict.data [i]; |
| 333 | sdl->overlay->pitches[i] = pict.linesize[i]; |
| 334 | } |
| 335 | SDL_DisplayYUVOverlay(sdl->overlay, &sdl->overlay_rect); |
| 336 | SDL_UnlockYUVOverlay(sdl->overlay); |
| 337 | |
| 338 | SDL_UpdateRect(sdl->surface, |
| 339 | sdl->overlay_rect.x, sdl->overlay_rect.y, |
| 340 | sdl->overlay_rect.w, sdl->overlay_rect.h); |
| 341 | SDL_UnlockMutex(sdl->mutex); |
| 342 | |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | #define OFFSET(x) offsetof(SDLContext,x) |
| 347 | |
| 348 | static const AVOption options[] = { |
| 349 | { "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, |
| 350 | { "icon_title", "set SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, |
| 351 | { "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, |
| 352 | { "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, |
| 353 | { NULL }, |
| 354 | }; |
| 355 | |
| 356 | static const AVClass sdl_class = { |
| 357 | .class_name = "sdl outdev", |
| 358 | .item_name = av_default_item_name, |
| 359 | .option = options, |
| 360 | .version = LIBAVUTIL_VERSION_INT, |
| 361 | .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, |
| 362 | }; |
| 363 | |
| 364 | AVOutputFormat ff_sdl_muxer = { |
| 365 | .name = "sdl", |
| 366 | .long_name = NULL_IF_CONFIG_SMALL("SDL output device"), |
| 367 | .priv_data_size = sizeof(SDLContext), |
| 368 | .audio_codec = AV_CODEC_ID_NONE, |
| 369 | .video_codec = AV_CODEC_ID_RAWVIDEO, |
| 370 | .write_header = sdl_write_header, |
| 371 | .write_packet = sdl_write_packet, |
| 372 | .write_trailer = sdl_write_trailer, |
| 373 | .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS, |
| 374 | .priv_class = &sdl_class, |
| 375 | }; |