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librempeg/libavdevice/sdl2.c
Dave Rice 110b4a4918 avdevice/sdl2: add option to set window position 
Allows arrangement of multiple windows such as:
ffmpeg -re -f lavfi -i mandelbrot -f sdl -window_x 1 -window_y 1 mandelbrot -vf waveform,format=yuv420p -f sdl -window_x 641 -window_y 1 waveform -vf vectorscope,format=yuv420p -f sdl -window_x 1 -window_y 481 vectorscop

Some changes by Marton Balint:
- allow negative position (partially or fully out-of-screen positions seem to
  be sanitized automatically by SDL (or my WM?), so no special handling is
  needed)
- only show window after the position is set
- do not use resizable and borderless flags at the same time, that caused
  issues in ffplay
- add docs

Signed-off-by: Marton Balint <cus@passwd.hu>
2018-10-23 19:42:32 +02:00

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/*
* Copyright (c) 2016 Josh de Kock
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* libSDL2 output device
*/
#include <SDL.h>
#include <SDL_thread.h>
#include "libavutil/avstring.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/time.h"
#include "avdevice.h"
typedef struct {
AVClass *class;
SDL_Window *window;
SDL_Renderer *renderer;
char *window_title;
int window_width, window_height; /**< size of the window */
int window_x, window_y; /**< position of the window */
int window_fullscreen;
int window_borderless;
int enable_quit_action;
SDL_Texture *texture;
int texture_fmt;
SDL_Rect texture_rect;
int inited;
} SDLContext;
static const struct sdl_texture_format_entry {
enum AVPixelFormat format; int texture_fmt;
} sdl_texture_format_map[] = {
/*
* Not implemented in FFmpeg, but leaving here for completeness.
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB4444 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_RGBA4444 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ABGR4444 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_BGRA4444 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB1555 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_RGBA5551 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ABGR1555 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_BGRA5551 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB2101010 },
*/
{ AV_PIX_FMT_RGB8, SDL_PIXELFORMAT_RGB332 },
{ AV_PIX_FMT_RGB444, SDL_PIXELFORMAT_RGB444 },
{ AV_PIX_FMT_RGB555, SDL_PIXELFORMAT_RGB555 },
{ AV_PIX_FMT_BGR555, SDL_PIXELFORMAT_BGR555 },
{ AV_PIX_FMT_RGB565, SDL_PIXELFORMAT_RGB565 },
{ AV_PIX_FMT_BGR565, SDL_PIXELFORMAT_BGR565 },
{ AV_PIX_FMT_RGB24, SDL_PIXELFORMAT_RGB24 },
{ AV_PIX_FMT_BGR24, SDL_PIXELFORMAT_BGR24 },
{ AV_PIX_FMT_0RGB32, SDL_PIXELFORMAT_RGB888 },
{ AV_PIX_FMT_0BGR32, SDL_PIXELFORMAT_BGR888 },
#if HAVE_BIGENDIAN
{ AV_PIX_FMT_RGB0, SDL_PIXELFORMAT_RGBX8888 },
{ AV_PIX_FMT_BGR0, SDL_PIXELFORMAT_BGRX8888 },
#else
{ AV_PIX_FMT_0BGR, SDL_PIXELFORMAT_RGBX8888 },
{ AV_PIX_FMT_0RGB, SDL_PIXELFORMAT_BGRX8888 },
#endif
{ AV_PIX_FMT_RGB32, SDL_PIXELFORMAT_ARGB8888 },
{ AV_PIX_FMT_RGB32_1, SDL_PIXELFORMAT_RGBA8888 },
{ AV_PIX_FMT_BGR32, SDL_PIXELFORMAT_ABGR8888 },
{ AV_PIX_FMT_BGR32_1, SDL_PIXELFORMAT_BGRA8888 },
{ AV_PIX_FMT_YUV420P, SDL_PIXELFORMAT_IYUV },
{ AV_PIX_FMT_YUYV422, SDL_PIXELFORMAT_YUY2 },
{ AV_PIX_FMT_UYVY422, SDL_PIXELFORMAT_UYVY },
{ AV_PIX_FMT_NONE, 0 },
};
static void compute_texture_rect(AVFormatContext *s)
{
AVRational sar, dar; /* sample and display aspect ratios */
SDLContext *sdl = s->priv_data;
AVStream *st = s->streams[0];
AVCodecParameters *codecpar = st->codecpar;
SDL_Rect *texture_rect = &sdl->texture_rect;
/* compute texture width and height from the codec context information */
sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
dar = av_mul_q(sar, (AVRational){ codecpar->width, codecpar->height });
/* we suppose the screen has a 1/1 sample aspect ratio */
if (sdl->window_width && sdl->window_height) {
/* fit in the window */
if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) {
/* fit in width */
texture_rect->w = sdl->window_width;
texture_rect->h = av_rescale(texture_rect->w, dar.den, dar.num);
} else {
/* fit in height */
texture_rect->h = sdl->window_height;
texture_rect->w = av_rescale(texture_rect->h, dar.num, dar.den);
}
} else {
if (sar.num > sar.den) {
texture_rect->w = codecpar->width;
texture_rect->h = av_rescale(texture_rect->w, dar.den, dar.num);
} else {
texture_rect->h = codecpar->height;
texture_rect->w = av_rescale(texture_rect->h, dar.num, dar.den);
}
sdl->window_width = texture_rect->w;
sdl->window_height = texture_rect->h;
}
texture_rect->x = (sdl->window_width - texture_rect->w) / 2;
texture_rect->y = (sdl->window_height - texture_rect->h) / 2;
}
static int sdl2_write_trailer(AVFormatContext *s)
{
SDLContext *sdl = s->priv_data;
if (sdl->texture)
SDL_DestroyTexture(sdl->texture);
sdl->texture = NULL;
if (sdl->renderer)
SDL_DestroyRenderer(sdl->renderer);
sdl->renderer = NULL;
if (sdl->window)
SDL_DestroyWindow(sdl->window);
sdl->window = NULL;
if (!sdl->inited)
SDL_Quit();
return 0;
}
static int sdl2_write_header(AVFormatContext *s)
{
SDLContext *sdl = s->priv_data;
AVStream *st = s->streams[0];
AVCodecParameters *codecpar = st->codecpar;
int i, ret = 0;
int flags = 0;
if (!sdl->window_title)
sdl->window_title = av_strdup(s->url);
if (SDL_WasInit(SDL_INIT_VIDEO)) {
av_log(s, AV_LOG_WARNING,
"SDL video subsystem was already inited, you could have multiple SDL outputs. This may cause unknown behaviour.\n");
sdl->inited = 1;
}
if ( s->nb_streams > 1
|| codecpar->codec_type != AVMEDIA_TYPE_VIDEO
|| codecpar->codec_id != AV_CODEC_ID_RAWVIDEO) {
av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
goto fail;
}
for (i = 0; sdl_texture_format_map[i].format != AV_PIX_FMT_NONE; i++) {
if (sdl_texture_format_map[i].format == codecpar->format) {
sdl->texture_fmt = sdl_texture_format_map[i].texture_fmt;
break;
}
}
if (!sdl->texture_fmt) {
av_log(s, AV_LOG_ERROR,
"Unsupported pixel format '%s'.\n",
av_get_pix_fmt_name(codecpar->format));
goto fail;
}
/* resize texture to width and height from the codec context information */
flags = SDL_WINDOW_HIDDEN |
(sdl->window_fullscreen ? SDL_WINDOW_FULLSCREEN : 0) |
(sdl->window_borderless ? SDL_WINDOW_BORDERLESS : SDL_WINDOW_RESIZABLE);
/* initialization */
if (!sdl->inited){
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
goto fail;
}
}
compute_texture_rect(s);
if (SDL_CreateWindowAndRenderer(sdl->window_width, sdl->window_height,
flags, &sdl->window, &sdl->renderer) != 0){
av_log(sdl, AV_LOG_ERROR, "Couldn't create window and renderer: %s\n", SDL_GetError());
goto fail;
}
SDL_SetWindowTitle(sdl->window, sdl->window_title);
SDL_SetWindowPosition(sdl->window, sdl->window_x, sdl->window_y);
SDL_ShowWindow(sdl->window);
sdl->texture = SDL_CreateTexture(sdl->renderer, sdl->texture_fmt, SDL_TEXTUREACCESS_STREAMING,
codecpar->width, codecpar->height);
if (!sdl->texture) {
av_log(sdl, AV_LOG_ERROR, "Unable to set create mode: %s\n", SDL_GetError());
goto fail;
}
av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d\n",
codecpar->width, codecpar->height, av_get_pix_fmt_name(codecpar->format),
sdl->window_width, sdl->window_height);
sdl->inited = 1;
return 0;
fail:
sdl2_write_trailer(s);
return ret;
}
static int sdl2_write_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, quit = 0;
SDLContext *sdl = s->priv_data;
AVCodecParameters *codecpar = s->streams[0]->codecpar;
uint8_t *data[4];
int linesize[4];
SDL_Event event;
if (SDL_PollEvent(&event)){
switch (event.type) {
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case SDLK_ESCAPE:
case SDLK_q:
quit = 1;
break;
default:
break;
}
break;
case SDL_QUIT:
quit = 1;
break;
case SDL_WINDOWEVENT:
switch(event.window.event){
case SDL_WINDOWEVENT_RESIZED:
case SDL_WINDOWEVENT_SIZE_CHANGED:
sdl->window_width = event.window.data1;
sdl->window_height = event.window.data2;
compute_texture_rect(s);
break;
default:
break;
}
break;
default:
break;
}
}
if (quit && sdl->enable_quit_action) {
sdl2_write_trailer(s);
return AVERROR(EIO);
}
av_image_fill_arrays(data, linesize, pkt->data, codecpar->format, codecpar->width, codecpar->height, 1);
switch (sdl->texture_fmt) {
/* case SDL_PIXELFORMAT_ARGB4444:
* case SDL_PIXELFORMAT_RGBA4444:
* case SDL_PIXELFORMAT_ABGR4444:
* case SDL_PIXELFORMAT_BGRA4444:
* case SDL_PIXELFORMAT_ARGB1555:
* case SDL_PIXELFORMAT_RGBA5551:
* case SDL_PIXELFORMAT_ABGR1555:
* case SDL_PIXELFORMAT_BGRA5551:
* case SDL_PIXELFORMAT_ARGB2101010:
*/
case SDL_PIXELFORMAT_IYUV:
case SDL_PIXELFORMAT_YUY2:
case SDL_PIXELFORMAT_UYVY:
ret = SDL_UpdateYUVTexture(sdl->texture, NULL,
data[0], linesize[0],
data[1], linesize[1],
data[2], linesize[2]);
break;
case SDL_PIXELFORMAT_RGB332:
case SDL_PIXELFORMAT_RGB444:
case SDL_PIXELFORMAT_RGB555:
case SDL_PIXELFORMAT_BGR555:
case SDL_PIXELFORMAT_RGB565:
case SDL_PIXELFORMAT_BGR565:
case SDL_PIXELFORMAT_RGB24:
case SDL_PIXELFORMAT_BGR24:
case SDL_PIXELFORMAT_RGB888:
case SDL_PIXELFORMAT_RGBX8888:
case SDL_PIXELFORMAT_BGR888:
case SDL_PIXELFORMAT_BGRX8888:
case SDL_PIXELFORMAT_ARGB8888:
case SDL_PIXELFORMAT_RGBA8888:
case SDL_PIXELFORMAT_ABGR8888:
case SDL_PIXELFORMAT_BGRA8888:
ret = SDL_UpdateTexture(sdl->texture, NULL, data[0], linesize[0]);
break;
default:
av_log(NULL, AV_LOG_FATAL, "Unsupported pixel format\n");
ret = -1;
break;
}
SDL_RenderClear(sdl->renderer);
SDL_RenderCopy(sdl->renderer, sdl->texture, NULL, &sdl->texture_rect);
SDL_RenderPresent(sdl->renderer);
return ret;
}
#define OFFSET(x) offsetof(SDLContext,x)
static const AVOption options[] = {
{ "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_x", "set SDL window x position", OFFSET(window_x), AV_OPT_TYPE_INT, { .i64 = SDL_WINDOWPOS_CENTERED }, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_y", "set SDL window y position", OFFSET(window_y), AV_OPT_TYPE_INT, { .i64 = SDL_WINDOWPOS_CENTERED }, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_borderless", "set SDL window border off", OFFSET(window_borderless), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
{ "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 },
{ NULL },
};
static const AVClass sdl2_class = {
.class_name = "sdl2 outdev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
};
AVOutputFormat ff_sdl2_muxer = {
.name = "sdl,sdl2",
.long_name = NULL_IF_CONFIG_SMALL("SDL2 output device"),
.priv_data_size = sizeof(SDLContext),
.audio_codec = AV_CODEC_ID_NONE,
.video_codec = AV_CODEC_ID_RAWVIDEO,
.write_header = sdl2_write_header,
.write_packet = sdl2_write_packet,
.write_trailer = sdl2_write_trailer,
.flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
.priv_class = &sdl2_class,
};
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