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 <SDL_thread.h>
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"
42 int window_width, window_height; /**< size of the window */
43 int window_fullscreen;
45 SDL_Rect overlay_rect;
48 int sdl_was_already_inited;
49 SDL_Thread *event_thread;
52 int init_ret; /* return code used to signal initialization errors */
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 },
66 static int sdl_write_trailer(AVFormatContext *s)
68 SDLContext *sdl = s->priv_data;
73 SDL_FreeYUVOverlay(sdl->overlay);
74 if (sdl->event_thread)
75 SDL_WaitThread(sdl->event_thread, NULL);
77 SDL_DestroyMutex(sdl->mutex);
79 SDL_DestroyCond(sdl->init_cond);
81 if (!sdl->sdl_was_already_inited)
87 static void compute_overlay_rect(AVFormatContext *s)
89 AVRational sar, dar; /* sample and display aspect ratios */
90 SDLContext *sdl = s->priv_data;
91 AVStream *st = s->streams[0];
92 AVCodecContext *encctx = st->codec;
93 SDL_Rect *overlay_rect = &sdl->overlay_rect;
95 /* compute overlay width and height from the codec context information */
96 sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
97 dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height });
99 /* we suppose the screen has a 1/1 sample aspect ratio */
100 if (sdl->window_width && sdl->window_height) {
101 /* fit in the window */
102 if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) {
104 overlay_rect->w = sdl->window_width;
105 overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num);
108 overlay_rect->h = sdl->window_height;
109 overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den);
112 if (sar.num > sar.den) {
113 overlay_rect->w = encctx->width;
114 overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num);
116 overlay_rect->h = encctx->height;
117 overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den);
119 sdl->window_width = overlay_rect->w;
120 sdl->window_height = overlay_rect->h;
123 overlay_rect->x = (sdl->window_width - overlay_rect->w) / 2;
124 overlay_rect->y = (sdl->window_height - overlay_rect->h) / 2;
127 #define SDL_BASE_FLAGS (SDL_SWSURFACE|SDL_RESIZABLE)
129 static int event_thread(void *arg)
131 AVFormatContext *s = arg;
132 SDLContext *sdl = s->priv_data;
133 int flags = SDL_BASE_FLAGS | (sdl->window_fullscreen ? SDL_FULLSCREEN : 0);
134 AVStream *st = s->streams[0];
135 AVCodecContext *encctx = st->codec;
138 if (SDL_Init(SDL_INIT_VIDEO) != 0) {
139 av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
140 sdl->init_ret = AVERROR(EINVAL);
144 SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);
145 sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,
148 av_log(sdl, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
149 sdl->init_ret = AVERROR(EINVAL);
153 sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height,
154 sdl->overlay_fmt, sdl->surface);
155 if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) {
156 av_log(s, AV_LOG_ERROR,
157 "SDL does not support an overlay with size of %dx%d pixels\n",
158 encctx->width, encctx->height);
159 sdl->init_ret = AVERROR(EINVAL);
164 av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d\n",
165 encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt),
166 sdl->overlay_rect.w, sdl->overlay_rect.h);
169 SDL_LockMutex(sdl->mutex);
171 SDL_UnlockMutex(sdl->mutex);
172 SDL_CondSignal(sdl->init_cond);
174 if (sdl->init_ret < 0)
175 return sdl->init_ret;
182 ret = SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_ALLEVENTS);
184 av_log(s, AV_LOG_ERROR, "Error when getting SDL event: %s\n", SDL_GetError());
192 switch (event.type) {
194 switch (event.key.keysym.sym) {
205 case SDL_VIDEORESIZE:
206 sdl->window_width = event.resize.w;
207 sdl->window_height = event.resize.h;
209 SDL_LockMutex(sdl->mutex);
210 sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, 24, SDL_BASE_FLAGS);
212 av_log(s, AV_LOG_ERROR, "Failed to set SDL video mode: %s\n", SDL_GetError());
215 compute_overlay_rect(s);
217 SDL_UnlockMutex(sdl->mutex);
228 static int sdl_write_header(AVFormatContext *s)
230 SDLContext *sdl = s->priv_data;
231 AVStream *st = s->streams[0];
232 AVCodecContext *encctx = st->codec;
235 if (!sdl->window_title)
236 sdl->window_title = av_strdup(s->filename);
237 if (!sdl->icon_title)
238 sdl->icon_title = av_strdup(sdl->window_title);
240 if (SDL_WasInit(SDL_INIT_VIDEO)) {
241 av_log(s, AV_LOG_ERROR,
242 "SDL video subsystem was already inited, aborting\n");
243 sdl->sdl_was_already_inited = 1;
244 ret = AVERROR(EINVAL);
248 if ( s->nb_streams > 1
249 || encctx->codec_type != AVMEDIA_TYPE_VIDEO
250 || encctx->codec_id != AV_CODEC_ID_RAWVIDEO) {
251 av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
252 ret = AVERROR(EINVAL);
256 for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != AV_PIX_FMT_NONE; i++) {
257 if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {
258 sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;
263 if (!sdl->overlay_fmt) {
264 av_log(s, AV_LOG_ERROR,
265 "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n",
266 av_get_pix_fmt_name(encctx->pix_fmt));
267 ret = AVERROR(EINVAL);
271 /* compute overlay width and height from the codec context information */
272 compute_overlay_rect(s);
274 sdl->init_cond = SDL_CreateCond();
275 if (!sdl->init_cond) {
276 av_log(s, AV_LOG_ERROR, "Could not create SDL condition variable: %s\n", SDL_GetError());
277 ret = AVERROR_EXTERNAL;
280 sdl->mutex = SDL_CreateMutex();
282 av_log(s, AV_LOG_ERROR, "Could not create SDL mutex: %s\n", SDL_GetError());
283 ret = AVERROR_EXTERNAL;
286 sdl->event_thread = SDL_CreateThread(event_thread, s);
287 if (!sdl->event_thread) {
288 av_log(s, AV_LOG_ERROR, "Could not create SDL event thread: %s\n", SDL_GetError());
289 ret = AVERROR_EXTERNAL;
293 /* wait until the video system has been inited */
294 SDL_LockMutex(sdl->mutex);
296 SDL_CondWait(sdl->init_cond, sdl->mutex);
298 SDL_UnlockMutex(sdl->mutex);
299 if (sdl->init_ret < 0) {
306 sdl_write_trailer(s);
310 static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt)
312 SDLContext *sdl = s->priv_data;
313 AVCodecContext *encctx = s->streams[0]->codec;
318 sdl_write_trailer(s);
321 avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
323 SDL_LockMutex(sdl->mutex);
324 SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,
325 SDL_MapRGB(sdl->surface->format, 0, 0, 0));
326 SDL_LockYUVOverlay(sdl->overlay);
327 for (i = 0; i < 3; i++) {
328 sdl->overlay->pixels [i] = pict.data [i];
329 sdl->overlay->pitches[i] = pict.linesize[i];
331 SDL_DisplayYUVOverlay(sdl->overlay, &sdl->overlay_rect);
332 SDL_UnlockYUVOverlay(sdl->overlay);
334 SDL_UpdateRect(sdl->surface,
335 sdl->overlay_rect.x, sdl->overlay_rect.y,
336 sdl->overlay_rect.w, sdl->overlay_rect.h);
337 SDL_UnlockMutex(sdl->mutex);
342 #define OFFSET(x) offsetof(SDLContext,x)
344 static const AVOption options[] = {
345 { "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
346 { "icon_title", "set SDL iconified window title", OFFSET(icon_title) , AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
347 { "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
348 { "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
352 static const AVClass sdl_class = {
353 .class_name = "sdl outdev",
354 .item_name = av_default_item_name,
356 .version = LIBAVUTIL_VERSION_INT,
359 AVOutputFormat ff_sdl_muxer = {
361 .long_name = NULL_IF_CONFIG_SMALL("SDL output device"),
362 .priv_data_size = sizeof(SDLContext),
363 .audio_codec = AV_CODEC_ID_NONE,
364 .video_codec = AV_CODEC_ID_RAWVIDEO,
365 .write_header = sdl_write_header,
366 .write_packet = sdl_write_packet,
367 .write_trailer = sdl_write_trailer,
368 .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
369 .priv_class = &sdl_class,