1/*
2 * libjingle
3 * Copyright 2004 Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28// Implementation of GtkVideoRenderer
29
30#include "talk/media/devices/gtkvideorenderer.h"
31
32#include <gdk/gdk.h>
33#include <glib.h>
34#include <gtk/gtk.h>
35
36#include "talk/media/base/videocommon.h"
37#include "talk/media/base/videoframe.h"
38
39namespace cricket {
40
41class ScopedGdkLock {
42 public:
43  ScopedGdkLock() {
44    gdk_threads_enter();
45  }
46
47  ~ScopedGdkLock() {
48    gdk_threads_leave();
49  }
50};
51
52GtkVideoRenderer::GtkVideoRenderer(int x, int y)
53    : window_(NULL),
54      draw_area_(NULL),
55      initial_x_(x),
56      initial_y_(y),
57      width_(0),
58      height_(0) {
59  g_type_init();
60  // g_thread_init API is deprecated since glib 2.31.0, see release note:
61  // http://mail.gnome.org/archives/gnome-announce-list/2011-October/msg00041.html
62#if !GLIB_CHECK_VERSION(2, 31, 0)
63  g_thread_init(NULL);
64#endif
65  gdk_threads_init();
66}
67
68GtkVideoRenderer::~GtkVideoRenderer() {
69  if (window_) {
70    ScopedGdkLock lock;
71    gtk_widget_destroy(window_);
72    // Run the Gtk main loop to tear down the window.
73    Pump();
74  }
75  // Don't need to destroy draw_area_ because it is not top-level, so it is
76  // implicitly destroyed by the above.
77}
78
79bool GtkVideoRenderer::SetSize(int width, int height, int reserved) {
80  ScopedGdkLock lock;
81
82  // If the dimension is the same, no-op.
83  if (width_ == width && height_ == height) {
84    return true;
85  }
86
87  // For the first frame, initialize the GTK window
88  if ((!window_ && !Initialize(width, height)) || IsClosed()) {
89    return false;
90  }
91
92  image_.reset(new uint8_t[width * height * 4]);
93  gtk_widget_set_size_request(draw_area_, width, height);
94
95  width_ = width;
96  height_ = height;
97  return true;
98}
99
100bool GtkVideoRenderer::RenderFrame(const VideoFrame* video_frame) {
101  if (!video_frame) {
102    return false;
103  }
104
105  const VideoFrame* frame = video_frame->GetCopyWithRotationApplied();
106
107  // Need to set size as the frame might be rotated.
108  if (!SetSize(frame->GetWidth(), frame->GetHeight(), 0)) {
109    return false;
110  }
111
112  // convert I420 frame to ABGR format, which is accepted by GTK
113  frame->ConvertToRgbBuffer(cricket::FOURCC_ABGR,
114                            image_.get(),
115                            frame->GetWidth() * frame->GetHeight() * 4,
116                            frame->GetWidth() * 4);
117
118  ScopedGdkLock lock;
119
120  if (IsClosed()) {
121    return false;
122  }
123
124  // draw the ABGR image
125  gdk_draw_rgb_32_image(draw_area_->window,
126                        draw_area_->style->fg_gc[GTK_STATE_NORMAL],
127                        0,
128                        0,
129                        frame->GetWidth(),
130                        frame->GetHeight(),
131                        GDK_RGB_DITHER_MAX,
132                        image_.get(),
133                        frame->GetWidth() * 4);
134
135  // Run the Gtk main loop to refresh the window.
136  Pump();
137  return true;
138}
139
140bool GtkVideoRenderer::Initialize(int width, int height) {
141  gtk_init(NULL, NULL);
142  window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
143  draw_area_ = gtk_drawing_area_new();
144  if (!window_ || !draw_area_) {
145    return false;
146  }
147
148  gtk_window_set_position(GTK_WINDOW(window_), GTK_WIN_POS_CENTER);
149  gtk_window_set_title(GTK_WINDOW(window_), "Video Renderer");
150  gtk_window_set_resizable(GTK_WINDOW(window_), FALSE);
151  gtk_widget_set_size_request(draw_area_, width, height);
152  gtk_container_add(GTK_CONTAINER(window_), draw_area_);
153  gtk_widget_show_all(window_);
154  gtk_window_move(GTK_WINDOW(window_), initial_x_, initial_y_);
155
156  image_.reset(new uint8_t[width * height * 4]);
157  return true;
158}
159
160void GtkVideoRenderer::Pump() {
161  while (gtk_events_pending()) {
162    gtk_main_iteration();
163  }
164}
165
166bool GtkVideoRenderer::IsClosed() const {
167  if (!window_) {
168    // Not initialized yet, so hasn't been closed.
169    return false;
170  }
171
172  if (!GTK_IS_WINDOW(window_) || !GTK_IS_DRAWING_AREA(draw_area_)) {
173    return true;
174  }
175
176  return false;
177}
178
179}  // namespace cricket
180