git.sesse.net Git - ffmpeg/blob - libavdevice/sdl2.c

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