FFmpeg: libavdevice/sdl.c Source File

FFmpeg
sdl.c
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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 };
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