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gst-play: Improve Win32 keyboard input handling

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The console HANDLE will be keep signalled state unless application
reads console input buffer immediately. So we should read and flush
console input buffer from the thread where the event is signalled,
instead of GMain context thread.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2058>
This commit is contained in:
Seungha Yang 2022-03-29 22:16:14 +09:00 committed by GStreamer Marge Bot
parent 2952a73f40
commit f465156bf9
1 changed files with 54 additions and 29 deletions
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83
subprojects/gst-plugins-base/tools/gst-play-kb.c
View file

@ -145,37 +145,37 @@ typedef struct
static Win32KeyHandler *win32_handler = NULL;
static gboolean
gst_play_kb_source_cb (Win32KeyHandler * handler)
typedef struct
{
HANDLE h_input = handler->console_handle;
INPUT_RECORD buffer;
DWORD n;
gboolean is_ascii;
WORD vkcode;
gchar key_val[2];
} KbSourceData;
if (PeekConsoleInput (h_input, &buffer, 1, &n) && n == 1) {
ReadConsoleInput (h_input, &buffer, 1, &n);
static gboolean
gst_play_kb_source_cb (KbSourceData * data)
{
if (!kb_callback)
return G_SOURCE_REMOVE;
if (buffer.EventType == KEY_EVENT && buffer.Event.KeyEvent.bKeyDown) {
gchar key_val[2] = { 0 };
switch (buffer.Event.KeyEvent.wVirtualKeyCode) {
case VK_RIGHT:
kb_callback (GST_PLAY_KB_ARROW_RIGHT, kb_callback_data);
break;
case VK_LEFT:
kb_callback (GST_PLAY_KB_ARROW_LEFT, kb_callback_data);
break;
case VK_UP:
kb_callback (GST_PLAY_KB_ARROW_UP, kb_callback_data);
break;
case VK_DOWN:
kb_callback (GST_PLAY_KB_ARROW_DOWN, kb_callback_data);
break;
default:
key_val[0] = buffer.Event.KeyEvent.uChar.AsciiChar;
kb_callback (key_val, kb_callback_data);
break;
}
if (data->is_ascii) {
kb_callback (data->key_val, kb_callback_data);
} else {
switch (data->vkcode) {
case VK_RIGHT:
kb_callback (GST_PLAY_KB_ARROW_RIGHT, kb_callback_data);
break;
case VK_LEFT:
kb_callback (GST_PLAY_KB_ARROW_LEFT, kb_callback_data);
break;
case VK_UP:
kb_callback (GST_PLAY_KB_ARROW_UP, kb_callback_data);
break;
case VK_DOWN:
kb_callback (GST_PLAY_KB_ARROW_DOWN, kb_callback_data);
break;
default:
break;
}
}
@ -187,6 +187,8 @@ gst_play_kb_win32_thread (gpointer user_data)
{
Win32KeyHandler *handler = (Win32KeyHandler *) user_data;
HANDLE handles[2];
INPUT_RECORD buffer;
DWORD n;
handles[0] = handler->event_handle;
handles[1] = handler->console_handle;
@ -210,7 +212,30 @@ gst_play_kb_win32_thread (gpointer user_data)
}
g_mutex_unlock (&handler->lock);
g_idle_add ((GSourceFunc) gst_play_kb_source_cb, handler);
if (PeekConsoleInput (handler->console_handle, &buffer, 1, &n) && n == 1) {
if (ReadConsoleInput (handler->console_handle, &buffer, 1, &n) &&
buffer.EventType == KEY_EVENT && buffer.Event.KeyEvent.bKeyDown) {
KbSourceData *data = g_new0 (KbSourceData, 1);
switch (buffer.Event.KeyEvent.wVirtualKeyCode) {
case VK_RIGHT:
case VK_LEFT:
case VK_UP:
case VK_DOWN:
data->is_ascii = FALSE;
data->vkcode = buffer.Event.KeyEvent.wVirtualKeyCode;
break;
default:
data->is_ascii = TRUE;
data->key_val[0] = buffer.Event.KeyEvent.uChar.AsciiChar;
data->key_val[1] = '\0';
break;
}
g_idle_add_full (G_PRIORITY_DEFAULT_IDLE,
(GSourceFunc) gst_play_kb_source_cb, data, g_free);
}
}
}
return NULL;