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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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examples: overlay: Add an example for Win32 window handle with playbin
Demonstrate video overlay handling on Windows when playbin is in use Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/983>
This commit is contained in:
Seungha Yang
parent
f76b731cbf
commit
932dfd4031
2 changed files with 256 additions and 0 deletions
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@ -43,4 +43,11 @@ if host_system == 'windows'
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dependencies : [gst_dep, video_dep],
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dependencies : [gst_dep, video_dep],
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install: false,
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install: false,
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)
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)
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executable('win32-videooverlay-playbin', 'win32-videooverlay-playbin.c',
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c_args : gst_plugins_base_args,
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include_directories : [configinc, libsinc],
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dependencies : [gst_dep, video_dep],
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install: false,
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)
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endif
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endif
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249
tests/examples/overlay/win32-videooverlay-playbin.c
Normal file
249
tests/examples/overlay/win32-videooverlay-playbin.c
Normal file
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@ -0,0 +1,249 @@
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/*
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* GStreamer
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* Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/video/videooverlay.h>
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#include <windows.h>
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static GMainLoop *loop = NULL;
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static gboolean visible = FALSE;
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static HWND hwnd = NULL;
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static gboolean set_handle_on_request = FALSE;
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static LRESULT CALLBACK
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window_proc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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switch (message) {
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case WM_DESTROY:
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hwnd = NULL;
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if (loop) {
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g_main_loop_quit (loop);
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}
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return 0;
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default:
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break;
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}
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return DefWindowProc (hWnd, message, wParam, lParam);
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}
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static gboolean
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msg_cb (GIOChannel * source, GIOCondition condition, gpointer data)
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{
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MSG msg;
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if (!PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
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return G_SOURCE_CONTINUE;
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TranslateMessage (&msg);
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DispatchMessage (&msg);
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return G_SOURCE_CONTINUE;
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}
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static gboolean
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bus_msg (GstBus * bus, GstMessage * msg, gpointer user_data)
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{
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GstElement *playbin = GST_ELEMENT (user_data);
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_ASYNC_DONE:
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/* make window visible when we have something to show */
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if (!visible && hwnd) {
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ShowWindow (hwnd, SW_SHOW);
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visible = TRUE;
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}
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gst_element_set_state (playbin, GST_STATE_PLAYING);
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break;
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case GST_MESSAGE_EOS:
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gst_println ("End of stream");
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g_main_loop_quit (loop);
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break;
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default:
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break;
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}
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return TRUE;
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}
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static GstBusSyncReply
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bus_sync_handler (GstBus * bus, GstMessage * msg, gpointer user_data)
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{
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if (set_handle_on_request &&
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gst_is_video_overlay_prepare_window_handle_message (msg)) {
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GstVideoOverlay *overlay = GST_VIDEO_OVERLAY (GST_MESSAGE_SRC (msg));
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gst_println ("Pipeline needs window handle");
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gst_video_overlay_set_window_handle (overlay, (guintptr) hwnd);
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gst_message_unref (msg);
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return GST_BUS_DROP;
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}
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_ERROR:{
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GError *err;
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gchar *dbg;
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gst_message_parse_error (msg, &err, &dbg);
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gst_printerrln ("ERROR %s ", err->message);
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if (dbg != NULL)
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gst_printerrln ("ERROR debug information: %s", dbg);
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g_clear_error (&err);
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g_free (dbg);
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g_main_loop_quit (loop);
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break;
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}
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default:
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break;
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}
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return GST_BUS_PASS;
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}
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gint
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main (gint argc, gchar ** argv)
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{
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GstElement *playbin;
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WNDCLASSEX wc = { 0, };
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HINSTANCE hinstance = GetModuleHandle (NULL);
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GIOChannel *msg_io_channel;
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GOptionContext *option_ctx;
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GError *error = NULL;
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gchar *uri = NULL;
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RECT wr = { 0, 0, 320, 240 };
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gint exitcode = 0;
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gboolean ret;
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GOptionEntry options[] = {
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{"uri", 0, 0, G_OPTION_ARG_STRING, &uri,
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"URI to test playback with Win32 overlay", NULL}
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,
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{"set-handle-on-request", 0, 0, G_OPTION_ARG_NONE, &set_handle_on_request,
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"Set window handle on \"prepare-window-handle\" message", NULL}
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,
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{NULL}
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};
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option_ctx =
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g_option_context_new ("WIN32 video overlay with playbin example");
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g_option_context_add_main_entries (option_ctx, options, NULL);
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g_option_context_add_group (option_ctx, gst_init_get_option_group ());
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ret = g_option_context_parse (option_ctx, &argc, &argv, &error);
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g_option_context_free (option_ctx);
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if (!ret) {
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gst_printerrln ("option parsing failed: %s", error->message);
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g_clear_error (&error);
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exit (1);
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}
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if (!uri) {
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gst_printerrln ("--uri is a required argument");
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g_clear_error (&error);
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exit (1);
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}
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/* prepare window */
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wc.cbSize = sizeof (WNDCLASSEX);
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wc.style = CS_HREDRAW | CS_VREDRAW;
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wc.lpfnWndProc = (WNDPROC) window_proc;
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wc.hInstance = hinstance;
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wc.hCursor = LoadCursor (NULL, IDC_ARROW);
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wc.lpszClassName = "GstWin32VideoOverlayPlaybin";
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RegisterClassEx (&wc);
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AdjustWindowRect (&wr, WS_OVERLAPPEDWINDOW, FALSE);
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hwnd = CreateWindowEx (0, wc.lpszClassName,
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"GstWin32VideoOverlayPlaybin",
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WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_OVERLAPPEDWINDOW,
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CW_USEDEFAULT, CW_USEDEFAULT,
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wr.right - wr.left, wr.bottom - wr.top, (HWND) NULL, (HMENU) NULL,
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hinstance, NULL);
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loop = g_main_loop_new (NULL, FALSE);
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msg_io_channel = g_io_channel_win32_new_messages (0);
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g_io_add_watch (msg_io_channel, G_IO_IN, msg_cb, NULL);
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/* prepare the pipeline */
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playbin = gst_element_factory_make ("playbin", NULL);
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if (!playbin) {
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gst_printerrln ("playbin is not available");
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exitcode = 1;
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goto terminate;
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}
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/* User can set window handle on playbin before starting
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* pipeline without watching "prepare-window-handle" message,
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* because playbin/playsink will pass the given handle to selected
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* video sink element later once video sink is prepared.
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*
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* But in case that an application wants to delay setting window handle
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* as much as possible for some reason, the application needs to check
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* "prepare-window-handle" message
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* (use gst_is_video_overlay_prepare_window_handle_message() API for check)
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* via a *sync* message handler and should set window handle on
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* the *sync* message handler immediately */
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if (!set_handle_on_request) {
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GstVideoOverlay *overlay = GST_VIDEO_OVERLAY (playbin);
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gst_println ("Setting window handle now");
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gst_video_overlay_set_window_handle (overlay, (guintptr) hwnd);
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} else {
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gst_println ("Will set window handle on \"prepare-window-handle\" message");
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}
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g_object_set (playbin, "uri", uri, NULL);
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gst_bus_set_sync_handler (GST_ELEMENT_BUS (playbin),
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bus_sync_handler, NULL, NULL);
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gst_bus_add_watch (GST_ELEMENT_BUS (playbin), bus_msg, playbin);
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if (gst_element_set_state (playbin,
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GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE) {
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gst_printerrln ("Pipeline doesn't want to pause");
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gst_bus_remove_watch (GST_ELEMENT_BUS (playbin));
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exitcode = 1;
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goto terminate;
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}
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g_main_loop_run (loop);
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gst_element_set_state (playbin, GST_STATE_NULL);
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gst_bus_remove_watch (GST_ELEMENT_BUS (playbin));
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terminate:
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if (hwnd)
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DestroyWindow (hwnd);
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gst_object_unref (playbin);
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g_io_channel_unref (msg_io_channel);
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g_main_loop_unref (loop);
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g_free (uri);
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return exitcode;
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}
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