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path: root/libavdevice/sdl2.c (plain)
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1/*
2 * Copyright (c) 2016 Josh de Kock
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 * libSDL2 output device
24 */
25
26#include <SDL.h>
27#include <SDL_thread.h>
28
29#include "libavutil/avstring.h"
30#include "libavutil/imgutils.h"
31#include "libavutil/opt.h"
32#include "libavutil/parseutils.h"
33#include "libavutil/pixdesc.h"
34#include "libavutil/time.h"
35#include "avdevice.h"
36
37typedef struct {
38 AVClass *class;
39 SDL_Window *window;
40 SDL_Renderer *renderer;
41 char *window_title;
42 int window_width, window_height; /**< size of the window */
43 int window_fullscreen;
44 int window_borderless;
45
46 SDL_Texture *texture;
47 int texture_fmt;
48 SDL_Rect texture_rect;
49
50 int inited;
51} SDLContext;
52
53static const struct sdl_texture_format_entry {
54 enum AVPixelFormat format; int texture_fmt;
55} sdl_texture_format_map[] = {
56 /*
57 * Not implemented in FFmpeg, but leaving here for completeness.
58 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB4444 },
59 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_RGBA4444 },
60 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ABGR4444 },
61 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_BGRA4444 },
62 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB1555 },
63 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_RGBA5551 },
64 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ABGR1555 },
65 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_BGRA5551 },
66 * { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB2101010 },
67 */
68 { AV_PIX_FMT_RGB8, SDL_PIXELFORMAT_RGB332 },
69 { AV_PIX_FMT_RGB444, SDL_PIXELFORMAT_RGB444 },
70 { AV_PIX_FMT_RGB555, SDL_PIXELFORMAT_RGB555 },
71 { AV_PIX_FMT_BGR555, SDL_PIXELFORMAT_BGR555 },
72 { AV_PIX_FMT_RGB565, SDL_PIXELFORMAT_RGB565 },
73 { AV_PIX_FMT_BGR565, SDL_PIXELFORMAT_BGR565 },
74 { AV_PIX_FMT_RGB24, SDL_PIXELFORMAT_RGB24 },
75 { AV_PIX_FMT_BGR24, SDL_PIXELFORMAT_BGR24 },
76 { AV_PIX_FMT_0RGB32, SDL_PIXELFORMAT_RGB888 },
77 { AV_PIX_FMT_0BGR32, SDL_PIXELFORMAT_BGR888 },
78#if HAVE_BIGENDIAN
79 { AV_PIX_FMT_RGB0, SDL_PIXELFORMAT_RGBX8888 },
80 { AV_PIX_FMT_BGR0, SDL_PIXELFORMAT_BGRX8888 },
81#else
82 { AV_PIX_FMT_0BGR, SDL_PIXELFORMAT_RGBX8888 },
83 { AV_PIX_FMT_0RGB, SDL_PIXELFORMAT_BGRX8888 },
84#endif
85 { AV_PIX_FMT_RGB32, SDL_PIXELFORMAT_ARGB8888 },
86 { AV_PIX_FMT_RGB32_1, SDL_PIXELFORMAT_RGBA8888 },
87 { AV_PIX_FMT_BGR32, SDL_PIXELFORMAT_ABGR8888 },
88 { AV_PIX_FMT_BGR32_1, SDL_PIXELFORMAT_BGRA8888 },
89 { AV_PIX_FMT_YUV420P, SDL_PIXELFORMAT_IYUV },
90 { AV_PIX_FMT_YUYV422, SDL_PIXELFORMAT_YUY2 },
91 { AV_PIX_FMT_UYVY422, SDL_PIXELFORMAT_UYVY },
92 { AV_PIX_FMT_NONE, 0 },
93};
94
95static void compute_texture_rect(AVFormatContext *s)
96{
97 AVRational sar, dar; /* sample and display aspect ratios */
98 SDLContext *sdl = s->priv_data;
99 AVStream *st = s->streams[0];
100 AVCodecParameters *codecpar = st->codecpar;
101 SDL_Rect *texture_rect = &sdl->texture_rect;
102
103 /* compute texture width and height from the codec context information */
104 sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
105 dar = av_mul_q(sar, (AVRational){ codecpar->width, codecpar->height });
106
107 /* we suppose the screen has a 1/1 sample aspect ratio */
108 if (sdl->window_width && sdl->window_height) {
109 /* fit in the window */
110 if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) {
111 /* fit in width */
112 texture_rect->w = sdl->window_width;
113 texture_rect->h = av_rescale(texture_rect->w, dar.den, dar.num);
114 } else {
115 /* fit in height */
116 texture_rect->h = sdl->window_height;
117 texture_rect->w = av_rescale(texture_rect->h, dar.num, dar.den);
118 }
119 } else {
120 if (sar.num > sar.den) {
121 texture_rect->w = codecpar->width;
122 texture_rect->h = av_rescale(texture_rect->w, dar.den, dar.num);
123 } else {
124 texture_rect->h = codecpar->height;
125 texture_rect->w = av_rescale(texture_rect->h, dar.num, dar.den);
126 }
127 sdl->window_width = texture_rect->w;
128 sdl->window_height = texture_rect->h;
129 }
130
131 texture_rect->x = (sdl->window_width - texture_rect->w) / 2;
132 texture_rect->y = (sdl->window_height - texture_rect->h) / 2;
133}
134
135static int sdl2_write_trailer(AVFormatContext *s)
136{
137 SDLContext *sdl = s->priv_data;
138
139 if (sdl->texture)
140 SDL_DestroyTexture(sdl->texture);
141 sdl->texture = NULL;
142
143 if (sdl->renderer)
144 SDL_DestroyRenderer(sdl->renderer);
145 sdl->renderer = NULL;
146
147 if (sdl->window)
148 SDL_DestroyWindow(sdl->window);
149 sdl->window = NULL;
150
151 if (!sdl->inited)
152 SDL_Quit();
153
154 return 0;
155}
156
157#define SDL_BASE_FLAGS (SDL_SWSURFACE|SDL_WINDOW_RESIZABLE)
158
159static int sdl2_write_header(AVFormatContext *s)
160{
161 SDLContext *sdl = s->priv_data;
162 AVStream *st = s->streams[0];
163 AVCodecParameters *codecpar = st->codecpar;
164 int i, ret = 0;
165 int flags = 0;
166
167 if (!sdl->window_title)
168 sdl->window_title = av_strdup(s->filename);
169
170 if (SDL_WasInit(SDL_INIT_VIDEO)) {
171 av_log(s, AV_LOG_WARNING,
172 "SDL video subsystem was already inited, you could have multiple SDL outputs. This may cause unknown behaviour.\n");
173 sdl->inited = 1;
174 }
175
176 if ( s->nb_streams > 1
177 || codecpar->codec_type != AVMEDIA_TYPE_VIDEO
178 || codecpar->codec_id != AV_CODEC_ID_RAWVIDEO) {
179 av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
180 goto fail;
181 }
182
183 for (i = 0; sdl_texture_format_map[i].format != AV_PIX_FMT_NONE; i++) {
184 if (sdl_texture_format_map[i].format == codecpar->format) {
185 sdl->texture_fmt = sdl_texture_format_map[i].texture_fmt;
186 break;
187 }
188 }
189
190 if (!sdl->texture_fmt) {
191 av_log(s, AV_LOG_ERROR,
192 "Unsupported pixel format '%s'.\n",
193 av_get_pix_fmt_name(codecpar->format));
194 goto fail;
195 }
196
197 /* resize texture to width and height from the codec context information */
198 flags = SDL_BASE_FLAGS | (sdl->window_fullscreen ? SDL_WINDOW_FULLSCREEN : 0) |
199 (sdl->window_borderless ? SDL_WINDOW_BORDERLESS : 0);
200
201 /* initialization */
202 if (!sdl->inited){
203 if (SDL_Init(SDL_INIT_VIDEO) != 0) {
204 av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
205 goto fail;
206 }
207 }
208
209 sdl->window_width = sdl->texture_rect.w = codecpar->width;
210 sdl->window_height = sdl->texture_rect.h = codecpar->height;
211 sdl->texture_rect.x = sdl->texture_rect.y = 0;
212
213 if (SDL_CreateWindowAndRenderer(sdl->window_width, sdl->window_height,
214 flags, &sdl->window, &sdl->renderer) != 0){
215 av_log(sdl, AV_LOG_ERROR, "Couldn't create window and renderer: %s\n", SDL_GetError());
216 goto fail;
217 }
218
219 SDL_SetWindowTitle(sdl->window, sdl->window_title);
220
221 sdl->texture = SDL_CreateTexture(sdl->renderer, sdl->texture_fmt, SDL_TEXTUREACCESS_STREAMING,
222 sdl->window_width, sdl->window_height);
223
224 if (!sdl->texture) {
225 av_log(sdl, AV_LOG_ERROR, "Unable to set create mode: %s\n", SDL_GetError());
226 goto fail;
227 }
228
229 av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d\n",
230 codecpar->width, codecpar->height, av_get_pix_fmt_name(codecpar->format),
231 sdl->window_width, sdl->window_height);
232
233 sdl->inited = 1;
234
235 return 0;
236fail:
237 sdl2_write_trailer(s);
238 return ret;
239}
240
241static int sdl2_write_packet(AVFormatContext *s, AVPacket *pkt)
242{
243 int ret, quit = 0;
244 SDLContext *sdl = s->priv_data;
245 AVCodecParameters *codecpar = s->streams[0]->codecpar;
246 uint8_t *data[4];
247 int linesize[4];
248
249 SDL_Event event;
250 if (SDL_PollEvent(&event)){
251 switch (event.type) {
252 case SDL_KEYDOWN:
253 switch (event.key.keysym.sym) {
254 case SDLK_ESCAPE:
255 case SDLK_q:
256 quit = 1;
257 break;
258 default:
259 break;
260 }
261 break;
262 case SDL_QUIT:
263 quit = 1;
264 break;
265 case SDL_WINDOWEVENT:
266 switch(event.window.event){
267 case SDL_WINDOWEVENT_RESIZED:
268 case SDL_WINDOWEVENT_SIZE_CHANGED:
269 sdl->window_width = event.window.data1;
270 sdl->window_height = event.window.data2;
271 compute_texture_rect(s);
272 break;
273 default:
274 break;
275 }
276 break;
277 default:
278 break;
279 }
280 }
281
282 if (quit) {
283 sdl2_write_trailer(s);
284 return AVERROR(EIO);
285 }
286
287 av_image_fill_arrays(data, linesize, pkt->data, codecpar->format, codecpar->width, codecpar->height, 1);
288 switch (sdl->texture_fmt) {
289 /* case SDL_PIXELFORMAT_ARGB4444:
290 * case SDL_PIXELFORMAT_RGBA4444:
291 * case SDL_PIXELFORMAT_ABGR4444:
292 * case SDL_PIXELFORMAT_BGRA4444:
293 * case SDL_PIXELFORMAT_ARGB1555:
294 * case SDL_PIXELFORMAT_RGBA5551:
295 * case SDL_PIXELFORMAT_ABGR1555:
296 * case SDL_PIXELFORMAT_BGRA5551:
297 * case SDL_PIXELFORMAT_ARGB2101010:
298 */
299 case SDL_PIXELFORMAT_IYUV:
300 case SDL_PIXELFORMAT_YUY2:
301 case SDL_PIXELFORMAT_UYVY:
302 ret = SDL_UpdateYUVTexture(sdl->texture, NULL,
303 data[0], linesize[0],
304 data[1], linesize[1],
305 data[2], linesize[2]);
306 break;
307 case SDL_PIXELFORMAT_RGB332:
308 case SDL_PIXELFORMAT_RGB444:
309 case SDL_PIXELFORMAT_RGB555:
310 case SDL_PIXELFORMAT_BGR555:
311 case SDL_PIXELFORMAT_RGB565:
312 case SDL_PIXELFORMAT_BGR565:
313 case SDL_PIXELFORMAT_RGB24:
314 case SDL_PIXELFORMAT_BGR24:
315 case SDL_PIXELFORMAT_RGB888:
316 case SDL_PIXELFORMAT_RGBX8888:
317 case SDL_PIXELFORMAT_BGR888:
318 case SDL_PIXELFORMAT_BGRX8888:
319 case SDL_PIXELFORMAT_ARGB8888:
320 case SDL_PIXELFORMAT_RGBA8888:
321 case SDL_PIXELFORMAT_ABGR8888:
322 case SDL_PIXELFORMAT_BGRA8888:
323 ret = SDL_UpdateTexture(sdl->texture, NULL, data[0], linesize[0]);
324 break;
325 default:
326 av_log(NULL, AV_LOG_FATAL, "Unsupported pixel format\n");
327 ret = -1;
328 break;
329 }
330 SDL_RenderClear(sdl->renderer);
331 SDL_RenderCopy(sdl->renderer, sdl->texture, NULL, &sdl->texture_rect);
332 SDL_RenderPresent(sdl->renderer);
333 return ret;
334}
335
336#define OFFSET(x) offsetof(SDLContext,x)
337
338static const AVOption options[] = {
339 { "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
340 { "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
341 { "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
342 { "window_borderless", "set SDL window border off", OFFSET(window_borderless), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
343 { NULL },
344};
345
346static const AVClass sdl2_class = {
347 .class_name = "sdl2 outdev",
348 .item_name = av_default_item_name,
349 .option = options,
350 .version = LIBAVUTIL_VERSION_INT,
351 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
352};
353
354AVOutputFormat ff_sdl2_muxer = {
355 .name = "sdl,sdl2",
356 .long_name = NULL_IF_CONFIG_SMALL("SDL2 output device"),
357 .priv_data_size = sizeof(SDLContext),
358 .audio_codec = AV_CODEC_ID_NONE,
359 .video_codec = AV_CODEC_ID_RAWVIDEO,
360 .write_header = sdl2_write_header,
361 .write_packet = sdl2_write_packet,
362 .write_trailer = sdl2_write_trailer,
363 .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
364 .priv_class = &sdl2_class,
365};
366
generated by cgit at 2024-05-17 02:01:40 (GMT)