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      1 // libjingle
      2 // Copyright 2011 Google Inc.
      3 //
      4 // Redistribution and use in source and binary forms, with or without
      5 // modification, are permitted provided that the following conditions are met:
      6 //
      7 //  1. Redistributions of source code must retain the above copyright notice,
      8 //     this list of conditions and the following disclaimer.
      9 //  2. Redistributions in binary form must reproduce the above copyright notice,
     10 //     this list of conditions and the following disclaimer in the documentation
     11 //     and/or other materials provided with the distribution.
     12 //  3. The name of the author may not be used to endorse or promote products
     13 //     derived from this software without specific prior written permission.
     14 //
     15 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     16 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     17 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     18 // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     19 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     21 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     22 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     23 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     24 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25 //
     26 // Implementation of CarbonVideoRenderer
     27 
     28 #include "talk/media/devices/carbonvideorenderer.h"
     29 
     30 #include "talk/media/base/videocommon.h"
     31 #include "talk/media/base/videoframe.h"
     32 #include "webrtc/base/logging.h"
     33 
     34 namespace cricket {
     35 
     36 CarbonVideoRenderer::CarbonVideoRenderer(int x, int y)
     37     : image_width_(0),
     38       image_height_(0),
     39       x_(x),
     40       y_(y),
     41       image_ref_(NULL),
     42       window_ref_(NULL) {
     43 }
     44 
     45 CarbonVideoRenderer::~CarbonVideoRenderer() {
     46   if (window_ref_) {
     47     DisposeWindow(window_ref_);
     48   }
     49 }
     50 
     51 // Called from the main event loop. All renderering needs to happen on
     52 // the main thread.
     53 OSStatus CarbonVideoRenderer::DrawEventHandler(EventHandlerCallRef handler,
     54                                                EventRef event,
     55                                                void* data) {
     56   OSStatus status = noErr;
     57   CarbonVideoRenderer* renderer = static_cast<CarbonVideoRenderer*>(data);
     58   if (renderer != NULL) {
     59     if (!renderer->DrawFrame()) {
     60       LOG(LS_ERROR) << "Failed to draw frame.";
     61     }
     62   }
     63   return status;
     64 }
     65 
     66 bool CarbonVideoRenderer::DrawFrame() {
     67   // Grab the image lock to make sure it is not changed why we'll draw it.
     68   rtc::CritScope cs(&image_crit_);
     69 
     70   if (image_.get() == NULL) {
     71     // Nothing to draw, just return.
     72     return true;
     73   }
     74   int width = image_width_;
     75   int height = image_height_;
     76   CGDataProviderRef provider =
     77       CGDataProviderCreateWithData(NULL, image_.get(), width * height * 4,
     78                                    NULL);
     79   CGColorSpaceRef color_space_ref = CGColorSpaceCreateDeviceRGB();
     80   CGBitmapInfo bitmap_info = kCGBitmapByteOrderDefault;
     81   CGColorRenderingIntent rendering_intent = kCGRenderingIntentDefault;
     82   CGImageRef image_ref = CGImageCreate(width, height, 8, 32, width * 4,
     83                                        color_space_ref, bitmap_info, provider,
     84                                        NULL, false, rendering_intent);
     85   CGDataProviderRelease(provider);
     86 
     87   if (image_ref == NULL) {
     88     return false;
     89   }
     90   CGContextRef context;
     91   SetPortWindowPort(window_ref_);
     92   if (QDBeginCGContext(GetWindowPort(window_ref_), &context) != noErr) {
     93     CGImageRelease(image_ref);
     94     return false;
     95   }
     96   Rect window_bounds;
     97   GetWindowPortBounds(window_ref_, &window_bounds);
     98 
     99   // Anchor the image to the top left corner.
    100   int x = 0;
    101   int y = window_bounds.bottom - CGImageGetHeight(image_ref);
    102   CGRect dst_rect = CGRectMake(x, y, CGImageGetWidth(image_ref),
    103                                CGImageGetHeight(image_ref));
    104   CGContextDrawImage(context, dst_rect, image_ref);
    105   CGContextFlush(context);
    106   QDEndCGContext(GetWindowPort(window_ref_), &context);
    107   CGImageRelease(image_ref);
    108   return true;
    109 }
    110 
    111 bool CarbonVideoRenderer::SetSize(int width, int height, int reserved) {
    112   if (width != image_width_ || height != image_height_) {
    113     // Grab the image lock while changing its size.
    114     rtc::CritScope cs(&image_crit_);
    115     image_width_ = width;
    116     image_height_ = height;
    117     image_.reset(new uint8[width * height * 4]);
    118     memset(image_.get(), 255, width * height * 4);
    119   }
    120   return true;
    121 }
    122 
    123 bool CarbonVideoRenderer::RenderFrame(const VideoFrame* frame) {
    124   if (!frame) {
    125     return false;
    126   }
    127   {
    128     // Grab the image lock so we are not trashing up the image being drawn.
    129     rtc::CritScope cs(&image_crit_);
    130     frame->ConvertToRgbBuffer(cricket::FOURCC_ABGR,
    131                               image_.get(),
    132                               frame->GetWidth() * frame->GetHeight() * 4,
    133                               frame->GetWidth() * 4);
    134   }
    135 
    136   // Trigger a repaint event for the whole window.
    137   Rect bounds;
    138   InvalWindowRect(window_ref_, GetWindowPortBounds(window_ref_, &bounds));
    139   return true;
    140 }
    141 
    142 bool CarbonVideoRenderer::Initialize() {
    143   OSStatus err;
    144   WindowAttributes attributes =
    145       kWindowStandardDocumentAttributes |
    146       kWindowLiveResizeAttribute |
    147       kWindowFrameworkScaledAttribute |
    148       kWindowStandardHandlerAttribute;
    149 
    150   struct Rect bounds;
    151   bounds.top = y_;
    152   bounds.bottom = 480;
    153   bounds.left = x_;
    154   bounds.right = 640;
    155   err = CreateNewWindow(kDocumentWindowClass, attributes,
    156                         &bounds, &window_ref_);
    157   if (!window_ref_ || err != noErr) {
    158     LOG(LS_ERROR) << "CreateNewWindow failed, error code: " << err;
    159     return false;
    160   }
    161   static const EventTypeSpec event_spec = {
    162     kEventClassWindow,
    163     kEventWindowDrawContent
    164   };
    165 
    166   err = InstallWindowEventHandler(
    167       window_ref_,
    168       NewEventHandlerUPP(CarbonVideoRenderer::DrawEventHandler),
    169       GetEventTypeCount(event_spec),
    170       &event_spec,
    171       this,
    172       NULL);
    173   if (err != noErr) {
    174     LOG(LS_ERROR) << "Failed to install event handler, error code: " << err;
    175     return false;
    176   }
    177   SelectWindow(window_ref_);
    178   ShowWindow(window_ref_);
    179   return true;
    180 }
    181 
    182 }  // namespace cricket
    183