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/* GStreamer command line playback testing utility - keyboard handling helpers
*
* Copyright (C) 2013 Tim-Philipp Müller <tim centricular net>
* Copyright (C) 2013 Centricular Ltd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst-play-kb.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef G_OS_UNIX
#include <unistd.h>
#include <termios.h>
#endif
#ifdef G_OS_WIN32
#include <windows.h>
#endif
#include <gst/gst.h>
/* This is all not thread-safe, but doesn't have to be really */
static GstPlayKbFunc kb_callback;
static gpointer kb_callback_data;
#ifdef G_OS_UNIX
static struct termios term_settings;
static gboolean term_settings_saved = FALSE;
static gulong io_watch_id;
static gboolean
gst_play_kb_io_cb (GIOChannel * ioc, GIOCondition cond, gpointer user_data)
{
GIOStatus status;
if (cond & G_IO_IN) {
gchar buf[16] = { 0, };
gsize read;
status = g_io_channel_read_chars (ioc, buf, sizeof (buf) - 1, &read, NULL);
if (status == G_IO_STATUS_ERROR)
return FALSE;
if (status == G_IO_STATUS_NORMAL) {
if (kb_callback)
kb_callback (buf, kb_callback_data);
}
}
return TRUE; /* call us again */
}
gboolean
gst_play_kb_set_key_handler (GstPlayKbFunc kb_func, gpointer user_data)
{
GIOChannel *ioc;
if (!isatty (STDIN_FILENO)) {
GST_INFO ("stdin is not connected to a terminal");
return FALSE;
}
if (io_watch_id > 0) {
g_source_remove (io_watch_id);
io_watch_id = 0;
}
if (kb_func == NULL && term_settings_saved) {
/* restore terminal settings */
if (tcsetattr (STDIN_FILENO, TCSAFLUSH, &term_settings) == 0)
term_settings_saved = FALSE;
else
g_warning ("could not restore terminal attributes");
setvbuf (stdin, NULL, _IOLBF, 0);
}
if (kb_func != NULL) {
struct termios new_settings;
if (!term_settings_saved) {
if (tcgetattr (STDIN_FILENO, &term_settings) != 0) {
g_warning ("could not save terminal attributes");
return FALSE;
}
term_settings_saved = TRUE;
/* Echo off, canonical mode off, extended input processing off */
new_settings = term_settings;
new_settings.c_lflag &= ~(ECHO | ICANON | IEXTEN);
new_settings.c_cc[VMIN] = 0;
new_settings.c_cc[VTIME] = 0;
if (tcsetattr (STDIN_FILENO, TCSAFLUSH, &new_settings) != 0) {
g_warning ("Could not set terminal state");
return FALSE;
}
setvbuf (stdin, NULL, _IONBF, 0);
}
}
ioc = g_io_channel_unix_new (STDIN_FILENO);
io_watch_id = g_io_add_watch_full (ioc, G_PRIORITY_DEFAULT, G_IO_IN,
(GIOFunc) gst_play_kb_io_cb, user_data, NULL);
g_io_channel_unref (ioc);
kb_callback = kb_func;
kb_callback_data = user_data;
return TRUE;
}
#elif defined(G_OS_WIN32)
static GSource *source = NULL;
static gboolean
gst_play_kb_source_cb (gpointer user_data)
{
HANDLE h_input = GetStdHandle (STD_INPUT_HANDLE);
INPUT_RECORD buffer;
DWORD n;
if (PeekConsoleInput (h_input, &buffer, 1, &n) && n == 1) {
ReadConsoleInput (h_input, &buffer, 1, &n);
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;
}
}
}
return G_SOURCE_CONTINUE;
}
gboolean
gst_play_kb_set_key_handler (GstPlayKbFunc kb_func, gpointer user_data)
{
gint fd = _fileno (stdin);
if (!_isatty (fd)) {
GST_INFO ("stdin is not connected to a terminal");
return FALSE;
}
if (source) {
g_source_destroy (source);
g_source_unref (source);
source = NULL;
}
if (kb_func) {
/* check input per 50 ms */
source = g_timeout_source_new (50);
g_source_set_callback (source,
(GSourceFunc) gst_play_kb_source_cb, NULL, NULL);
g_source_attach (source, NULL);
}
kb_callback = kb_func;
kb_callback_data = user_data;
return TRUE;
}
#else
gboolean
gst_play_kb_set_key_handler (GstPlayKbFunc key_func, gpointer user_data)
{
GST_FIXME ("Keyboard handling for this OS needs to be implemented");
return FALSE;
}
#endif /* !G_OS_UNIX */
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