[FFmpeg-devel] [PATCH 2/2] avdevice/sdl2 : add option to set window position

[Dave Rice]

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

From 00438983c96b5db227b9975a2c160fc6aac5219d Mon Sep 17 00:00:00 2001
From: Dave Rice <dave at dericed.com>
Date: Mon, 1 Oct 2018 17:08:35 -0400
Subject: [PATCH 2/2] avdevice/sdl2 : add option to set window position

---
 libavdevice/sdl2.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libavdevice/sdl2.c b/libavdevice/sdl2.c
index da5143078e..69c541da23 100644
--- a/libavdevice/sdl2.c
+++ b/libavdevice/sdl2.c
@@ -40,6 +40,7 @@ typedef struct {
     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;
@@ -217,6 +218,12 @@ static int sdl2_write_header(AVFormatContext *s)
 
     SDL_SetWindowTitle(sdl->window, sdl->window_title);
 
+    if (!sdl->window_x)
+        sdl->window_x = SDL_WINDOWPOS_CENTERED;
+    if (!sdl->window_y)
+        sdl->window_y = SDL_WINDOWPOS_CENTERED;
+    SDL_SetWindowPosition(sdl->window, sdl->window_x, sdl->window_y);
+
     sdl->texture = SDL_CreateTexture(sdl->renderer, sdl->texture_fmt, SDL_TEXTUREACCESS_STREAMING,
                                      codecpar->width, codecpar->height);
 
@@ -337,6 +344,8 @@ static int sdl2_write_packet(AVFormatContext *s, AVPacket *pkt)
 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 = 0 },    0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
+    { "window_y",          "set SDL window y position",  OFFSET(window_y),     AV_OPT_TYPE_INT,        { .i64 = 0 },    0, 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 },
-- 
2.19.0