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platform-external-webrtc/webrtc/modules/desktop_capture/screen_capturer_mac.mm
zijiehe 98903d2f5e Remove ScreenCapturer and WindowCapturer 
This change removes ScreenCapturer and WindowCapturer from WebRTC.

BUG=webrtc:6513

Review-Url: https://codereview.webrtc.org/2490063002
Cr-Commit-Position: refs/heads/master@{#15033}
2016-11-11 05:57:19 +00:00

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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stddef.h>
#include <memory>
#include <set>
#include <utility>
#include <ApplicationServices/ApplicationServices.h>
#include <Cocoa/Cocoa.h>
#include <CoreGraphics/CoreGraphics.h>
#include <dlfcn.h>
#include <OpenGL/CGLMacro.h>
#include <OpenGL/OpenGL.h>
#include "webrtc/base/checks.h"
#include "webrtc/base/constructormagic.h"
#include "webrtc/base/macutils.h"
#include "webrtc/base/timeutils.h"
#include "webrtc/modules/desktop_capture/desktop_capturer.h"
#include "webrtc/modules/desktop_capture/desktop_capture_options.h"
#include "webrtc/modules/desktop_capture/desktop_frame.h"
#include "webrtc/modules/desktop_capture/desktop_geometry.h"
#include "webrtc/modules/desktop_capture/desktop_region.h"
#include "webrtc/modules/desktop_capture/mac/desktop_configuration.h"
#include "webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h"
#include "webrtc/modules/desktop_capture/mac/scoped_pixel_buffer_object.h"
#include "webrtc/modules/desktop_capture/screen_capture_frame_queue.h"
#include "webrtc/modules/desktop_capture/screen_capturer_helper.h"
#include "webrtc/modules/desktop_capture/shared_desktop_frame.h"
#include "webrtc/system_wrappers/include/logging.h"
// Once Chrome no longer supports OSX 10.8, everything within this
// preprocessor block can be removed. https://crbug.com/579255
#if !defined(MAC_OS_X_VERSION_10_9) || \
MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_9
CG_EXTERN const CGRect* CGDisplayStreamUpdateGetRects(
CGDisplayStreamUpdateRef updateRef,
CGDisplayStreamUpdateRectType rectType,
size_t* rectCount);
CG_EXTERN CFRunLoopSourceRef
CGDisplayStreamGetRunLoopSource(CGDisplayStreamRef displayStream);
CG_EXTERN CGError CGDisplayStreamStop(CGDisplayStreamRef displayStream);
CG_EXTERN CGError CGDisplayStreamStart(CGDisplayStreamRef displayStream);
CG_EXTERN CGDisplayStreamRef
CGDisplayStreamCreate(CGDirectDisplayID display,
size_t outputWidth,
size_t outputHeight,
int32_t pixelFormat,
CFDictionaryRef properties,
CGDisplayStreamFrameAvailableHandler handler);
#endif
namespace webrtc {
namespace {
// CGDisplayStreamRefs need to be destroyed asynchronously after receiving a
// kCGDisplayStreamFrameStatusStopped callback from CoreGraphics. This may
// happen after the ScreenCapturerMac has been destroyed. DisplayStreamManager
// is responsible for destroying all extant CGDisplayStreamRefs, and will
// destroy itself once it's done.
class DisplayStreamManager {
public:
int GetUniqueId() { return ++unique_id_generator_; }
void DestroyStream(int unique_id) {
auto it = display_stream_wrappers_.find(unique_id);
RTC_CHECK(it != display_stream_wrappers_.end());
RTC_CHECK(!it->second.active);
CFRelease(it->second.stream);
display_stream_wrappers_.erase(it);
if (ready_for_self_destruction_ && display_stream_wrappers_.empty())
delete this;
}
void SaveStream(int unique_id,
CGDisplayStreamRef stream) {
RTC_CHECK(unique_id <= unique_id_generator_);
DisplayStreamWrapper wrapper;
wrapper.stream = stream;
display_stream_wrappers_[unique_id] = wrapper;
}
void UnregisterActiveStreams() {
for (auto& pair : display_stream_wrappers_) {
DisplayStreamWrapper& wrapper = pair.second;
if (wrapper.active) {
wrapper.active = false;
CFRunLoopSourceRef source =
CGDisplayStreamGetRunLoopSource(wrapper.stream);
CFRunLoopRemoveSource(CFRunLoopGetCurrent(), source,
kCFRunLoopDefaultMode);
CGDisplayStreamStop(wrapper.stream);
}
}
}
void PrepareForSelfDestruction() {
ready_for_self_destruction_ = true;
if (display_stream_wrappers_.empty())
delete this;
}
// Once the DisplayStreamManager is ready for destruction, the
// ScreenCapturerMac is no longer present. Any updates should be ignored.
bool ShouldIgnoreUpdates() { return ready_for_self_destruction_; }
private:
struct DisplayStreamWrapper {
// The registered CGDisplayStreamRef.
CGDisplayStreamRef stream = nullptr;
// Set to false when the stream has been stopped. An asynchronous callback
// from CoreGraphics will let us destroy the CGDisplayStreamRef.
bool active = true;
};
std::map<int, DisplayStreamWrapper> display_stream_wrappers_;
int unique_id_generator_ = 0;
bool ready_for_self_destruction_ = false;
};
// Definitions used to dynamic-link to deprecated OS 10.6 functions.
const char* kApplicationServicesLibraryName =
"/System/Library/Frameworks/ApplicationServices.framework/"
"ApplicationServices";
typedef void* (*CGDisplayBaseAddressFunc)(CGDirectDisplayID);
typedef size_t (*CGDisplayBytesPerRowFunc)(CGDirectDisplayID);
typedef size_t (*CGDisplayBitsPerPixelFunc)(CGDirectDisplayID);
const char* kOpenGlLibraryName =
"/System/Library/Frameworks/OpenGL.framework/OpenGL";
typedef CGLError (*CGLSetFullScreenFunc)(CGLContextObj);
// Standard Mac displays have 72dpi, but we report 96dpi for
// consistency with Windows and Linux.
const int kStandardDPI = 96;
// Scales all coordinates of a rect by a specified factor.
DesktopRect ScaleAndRoundCGRect(const CGRect& rect, float scale) {
return DesktopRect::MakeLTRB(
static_cast<int>(floor(rect.origin.x * scale)),
static_cast<int>(floor(rect.origin.y * scale)),
static_cast<int>(ceil((rect.origin.x + rect.size.width) * scale)),
static_cast<int>(ceil((rect.origin.y + rect.size.height) * scale)));
}
// Copy pixels in the |rect| from |src_place| to |dest_plane|. |rect| should be
// relative to the origin of |src_plane| and |dest_plane|.
void CopyRect(const uint8_t* src_plane,
int src_plane_stride,
uint8_t* dest_plane,
int dest_plane_stride,
int bytes_per_pixel,
const DesktopRect& rect) {
// Get the address of the starting point.
const int src_y_offset = src_plane_stride * rect.top();
const int dest_y_offset = dest_plane_stride * rect.top();
const int x_offset = bytes_per_pixel * rect.left();
src_plane += src_y_offset + x_offset;
dest_plane += dest_y_offset + x_offset;
// Copy pixels in the rectangle line by line.
const int bytes_per_line = bytes_per_pixel * rect.width();
const int height = rect.height();
for (int i = 0 ; i < height; ++i) {
memcpy(dest_plane, src_plane, bytes_per_line);
src_plane += src_plane_stride;
dest_plane += dest_plane_stride;
}
}
// Returns an array of CGWindowID for all the on-screen windows except
// |window_to_exclude|, or NULL if the window is not found or it fails. The
// caller should release the returned CFArrayRef.
CFArrayRef CreateWindowListWithExclusion(CGWindowID window_to_exclude) {
if (!window_to_exclude)
return nullptr;
CFArrayRef all_windows = CGWindowListCopyWindowInfo(
kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
if (!all_windows)
return nullptr;
CFMutableArrayRef returned_array =
CFArrayCreateMutable(nullptr, CFArrayGetCount(all_windows), nullptr);
bool found = false;
for (CFIndex i = 0; i < CFArrayGetCount(all_windows); ++i) {
CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
CFArrayGetValueAtIndex(all_windows, i));
CFNumberRef id_ref = reinterpret_cast<CFNumberRef>(
CFDictionaryGetValue(window, kCGWindowNumber));
CGWindowID id;
CFNumberGetValue(id_ref, kCFNumberIntType, &id);
if (id == window_to_exclude) {
found = true;
continue;
}
CFArrayAppendValue(returned_array, reinterpret_cast<void *>(id));
}
CFRelease(all_windows);
if (!found) {
CFRelease(returned_array);
returned_array = nullptr;
}
return returned_array;
}
// Returns the bounds of |window| in physical pixels, enlarged by a small amount
// on four edges to take account of the border/shadow effects.
DesktopRect GetExcludedWindowPixelBounds(CGWindowID window,
float dip_to_pixel_scale) {
// The amount of pixels to add to the actual window bounds to take into
// account of the border/shadow effects.
static const int kBorderEffectSize = 20;
CGRect rect;
CGWindowID ids[1];
ids[0] = window;
CFArrayRef window_id_array =
CFArrayCreate(nullptr, reinterpret_cast<const void**>(&ids), 1, nullptr);
CFArrayRef window_array =
CGWindowListCreateDescriptionFromArray(window_id_array);
if (CFArrayGetCount(window_array) > 0) {
CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
CFArrayGetValueAtIndex(window_array, 0));
CFDictionaryRef bounds_ref = reinterpret_cast<CFDictionaryRef>(
CFDictionaryGetValue(window, kCGWindowBounds));
CGRectMakeWithDictionaryRepresentation(bounds_ref, &rect);
}
CFRelease(window_id_array);
CFRelease(window_array);
rect.origin.x -= kBorderEffectSize;
rect.origin.y -= kBorderEffectSize;
rect.size.width += kBorderEffectSize * 2;
rect.size.height += kBorderEffectSize * 2;
// |rect| is in DIP, so convert to physical pixels.
return ScaleAndRoundCGRect(rect, dip_to_pixel_scale);
}
// Create an image of the given region using the given |window_list|.
// |pixel_bounds| should be in the primary display's coordinate in physical
// pixels. The caller should release the returned CGImageRef and CFDataRef.
CGImageRef CreateExcludedWindowRegionImage(const DesktopRect& pixel_bounds,
float dip_to_pixel_scale,
CFArrayRef window_list) {
CGRect window_bounds;
// The origin is in DIP while the size is in physical pixels. That's what
// CGWindowListCreateImageFromArray expects.
window_bounds.origin.x = pixel_bounds.left() / dip_to_pixel_scale;
window_bounds.origin.y = pixel_bounds.top() / dip_to_pixel_scale;
window_bounds.size.width = pixel_bounds.width();
window_bounds.size.height = pixel_bounds.height();
return CGWindowListCreateImageFromArray(
window_bounds, window_list, kCGWindowImageDefault);
}
// A class to perform video frame capturing for mac.
class ScreenCapturerMac : public DesktopCapturer {
public:
explicit ScreenCapturerMac(
rtc::scoped_refptr<DesktopConfigurationMonitor> desktop_config_monitor);
~ScreenCapturerMac() override;
bool Init();
// DesktopCapturer interface.
void Start(Callback* callback) override;
void CaptureFrame() override;
void SetExcludedWindow(WindowId window) override;
bool GetSourceList(SourceList* screens) override;
bool SelectSource(SourceId id) override;
private:
void GlBlitFast(const DesktopFrame& frame,
const DesktopRegion& region);
void GlBlitSlow(const DesktopFrame& frame);
void CgBlitPreLion(const DesktopFrame& frame,
const DesktopRegion& region);
// Returns false if the selected screen is no longer valid.
bool CgBlitPostLion(const DesktopFrame& frame,
const DesktopRegion& region);
// Called when the screen configuration is changed.
void ScreenConfigurationChanged();
bool RegisterRefreshAndMoveHandlers();
void UnregisterRefreshAndMoveHandlers();
void ScreenRefresh(CGRectCount count, const CGRect *rect_array);
void ReleaseBuffers();
std::unique_ptr<DesktopFrame> CreateFrame();
Callback* callback_ = nullptr;
CGLContextObj cgl_context_ = nullptr;
ScopedPixelBufferObject pixel_buffer_object_;
// Queue of the frames buffers.
ScreenCaptureFrameQueue<SharedDesktopFrame> queue_;
// Current display configuration.
MacDesktopConfiguration desktop_config_;
// Currently selected display, or 0 if the full desktop is selected. On OS X
// 10.6 and before, this is always 0.
CGDirectDisplayID current_display_ = 0;
// The physical pixel bounds of the current screen.
DesktopRect screen_pixel_bounds_;
// The dip to physical pixel scale of the current screen.
float dip_to_pixel_scale_ = 1.0f;
// A thread-safe list of invalid rectangles, and the size of the most
// recently captured screen.
ScreenCapturerHelper helper_;
// Contains an invalid region from the previous capture.
DesktopRegion last_invalid_region_;
// Monitoring display reconfiguration.
rtc::scoped_refptr<DesktopConfigurationMonitor> desktop_config_monitor_;
// Dynamically link to deprecated APIs for Mac OS X 10.6 support.
void* app_services_library_ = nullptr;
CGDisplayBaseAddressFunc cg_display_base_address_ = nullptr;
CGDisplayBytesPerRowFunc cg_display_bytes_per_row_ = nullptr;
CGDisplayBitsPerPixelFunc cg_display_bits_per_pixel_ = nullptr;
void* opengl_library_ = nullptr;
CGLSetFullScreenFunc cgl_set_full_screen_ = nullptr;
CGWindowID excluded_window_ = 0;
// A self-owned object that will destroy itself after ScreenCapturerMac and
// all display streams have been destroyed..
DisplayStreamManager* display_stream_manager_;
RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCapturerMac);
};
// DesktopFrame wrapper that flips wrapped frame upside down by inverting
// stride.
class InvertedDesktopFrame : public DesktopFrame {
public:
InvertedDesktopFrame(std::unique_ptr<DesktopFrame> frame)
: DesktopFrame(
frame->size(),
-frame->stride(),
frame->data() + (frame->size().height() - 1) * frame->stride(),
frame->shared_memory()) {
original_frame_ = std::move(frame);
set_dpi(original_frame_->dpi());
set_capture_time_ms(original_frame_->capture_time_ms());
mutable_updated_region()->Swap(original_frame_->mutable_updated_region());
}
~InvertedDesktopFrame() override {}
private:
std::unique_ptr<DesktopFrame> original_frame_;
RTC_DISALLOW_COPY_AND_ASSIGN(InvertedDesktopFrame);
};
ScreenCapturerMac::ScreenCapturerMac(
rtc::scoped_refptr<DesktopConfigurationMonitor> desktop_config_monitor)
: desktop_config_monitor_(desktop_config_monitor) {
display_stream_manager_ = new DisplayStreamManager;
}
ScreenCapturerMac::~ScreenCapturerMac() {
ReleaseBuffers();
UnregisterRefreshAndMoveHandlers();
display_stream_manager_->PrepareForSelfDestruction();
dlclose(app_services_library_);
dlclose(opengl_library_);
}
bool ScreenCapturerMac::Init() {
desktop_config_monitor_->Lock();
desktop_config_ = desktop_config_monitor_->desktop_configuration();
desktop_config_monitor_->Unlock();
if (!RegisterRefreshAndMoveHandlers()) {
return false;
}
ScreenConfigurationChanged();
return true;
}
void ScreenCapturerMac::ReleaseBuffers() {
if (cgl_context_) {
pixel_buffer_object_.Release();
CGLDestroyContext(cgl_context_);
cgl_context_ = nullptr;
}
// The buffers might be in use by the encoder, so don't delete them here.
// Instead, mark them as "needs update"; next time the buffers are used by
// the capturer, they will be recreated if necessary.
queue_.Reset();
}
void ScreenCapturerMac::Start(Callback* callback) {
assert(!callback_);
assert(callback);
callback_ = callback;
}
void ScreenCapturerMac::CaptureFrame() {
int64_t capture_start_time_nanos = rtc::TimeNanos();
queue_.MoveToNextFrame();
RTC_DCHECK(!queue_.current_frame() || !queue_.current_frame()->IsShared());
desktop_config_monitor_->Lock();
MacDesktopConfiguration new_config =
desktop_config_monitor_->desktop_configuration();
if (!desktop_config_.Equals(new_config)) {
desktop_config_ = new_config;
// If the display configuraiton has changed then refresh capturer data
// structures. Occasionally, the refresh and move handlers are lost when
// the screen mode changes, so re-register them here.
UnregisterRefreshAndMoveHandlers();
RegisterRefreshAndMoveHandlers();
ScreenConfigurationChanged();
}
DesktopRegion region;
helper_.TakeInvalidRegion(&region);
// If the current buffer is from an older generation then allocate a new one.
// Note that we can't reallocate other buffers at this point, since the caller
// may still be reading from them.
if (!queue_.current_frame())
queue_.ReplaceCurrentFrame(SharedDesktopFrame::Wrap(CreateFrame()));
DesktopFrame* current_frame = queue_.current_frame();
bool flip = false; // GL capturers need flipping.
if (rtc::GetOSVersionName() >= rtc::kMacOSLion) {
// Lion requires us to use their new APIs for doing screen capture. These
// APIS currently crash on 10.6.8 if there is no monitor attached.
if (!CgBlitPostLion(*current_frame, region)) {
desktop_config_monitor_->Unlock();
callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
return;
}
} else if (cgl_context_) {
flip = true;
if (pixel_buffer_object_.get() != 0) {
GlBlitFast(*current_frame, region);
} else {
// See comment in ScopedPixelBufferObject::Init about why the slow
// path is always used on 10.5.
GlBlitSlow(*current_frame);
}
} else {
CgBlitPreLion(*current_frame, region);
}
std::unique_ptr<DesktopFrame> new_frame = queue_.current_frame()->Share();
*new_frame->mutable_updated_region() = region;
if (flip)
new_frame.reset(new InvertedDesktopFrame(std::move(new_frame)));
helper_.set_size_most_recent(new_frame->size());
// Signal that we are done capturing data from the display framebuffer,
// and accessing display structures.
desktop_config_monitor_->Unlock();
new_frame->set_capture_time_ms((rtc::TimeNanos() - capture_start_time_nanos) /
rtc::kNumNanosecsPerMillisec);
callback_->OnCaptureResult(Result::SUCCESS, std::move(new_frame));
}
void ScreenCapturerMac::SetExcludedWindow(WindowId window) {
excluded_window_ = window;
}
bool ScreenCapturerMac::GetSourceList(SourceList* screens) {
assert(screens->size() == 0);
if (rtc::GetOSVersionName() < rtc::kMacOSLion) {
// Single monitor cast is not supported on pre OS X 10.7.
screens->push_back({kFullDesktopScreenId});
return true;
}
for (MacDisplayConfigurations::iterator it = desktop_config_.displays.begin();
it != desktop_config_.displays.end(); ++it) {
screens->push_back({it->id});
}
return true;
}
bool ScreenCapturerMac::SelectSource(SourceId id) {
if (rtc::GetOSVersionName() < rtc::kMacOSLion) {
// Ignore the screen selection on unsupported OS.
assert(!current_display_);
return id == kFullDesktopScreenId;
}
if (id == kFullDesktopScreenId) {
current_display_ = 0;
} else {
const MacDisplayConfiguration* config =
desktop_config_.FindDisplayConfigurationById(
static_cast<CGDirectDisplayID>(id));
if (!config)
return false;
current_display_ = config->id;
}
ScreenConfigurationChanged();
return true;
}
void ScreenCapturerMac::GlBlitFast(const DesktopFrame& frame,
const DesktopRegion& region) {
// Clip to the size of our current screen.
DesktopRect clip_rect = DesktopRect::MakeSize(frame.size());
if (queue_.previous_frame()) {
// We are doing double buffer for the capture data so we just need to copy
// the invalid region from the previous capture in the current buffer.
// TODO(hclam): We can reduce the amount of copying here by subtracting
// |capturer_helper_|s region from |last_invalid_region_|.
// http://crbug.com/92354
// Since the image obtained from OpenGL is upside-down, need to do some
// magic here to copy the correct rectangle.
const int y_offset = (frame.size().height() - 1) * frame.stride();
for (DesktopRegion::Iterator i(last_invalid_region_);
!i.IsAtEnd(); i.Advance()) {
DesktopRect copy_rect = i.rect();
copy_rect.IntersectWith(clip_rect);
if (!copy_rect.is_empty()) {
CopyRect(queue_.previous_frame()->data() + y_offset,
-frame.stride(),
frame.data() + y_offset,
-frame.stride(),
DesktopFrame::kBytesPerPixel,
copy_rect);
}
}
}
last_invalid_region_ = region;
CGLContextObj CGL_MACRO_CONTEXT = cgl_context_;
glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, pixel_buffer_object_.get());
glReadPixels(0, 0, frame.size().width(), frame.size().height(), GL_BGRA,
GL_UNSIGNED_BYTE, 0);
GLubyte* ptr = static_cast<GLubyte*>(
glMapBufferARB(GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY_ARB));
if (!ptr) {
// If the buffer can't be mapped, assume that it's no longer valid and
// release it.
pixel_buffer_object_.Release();
} else {
// Copy only from the dirty rects. Since the image obtained from OpenGL is
// upside-down we need to do some magic here to copy the correct rectangle.
const int y_offset = (frame.size().height() - 1) * frame.stride();
for (DesktopRegion::Iterator i(region);
!i.IsAtEnd(); i.Advance()) {
DesktopRect copy_rect = i.rect();
copy_rect.IntersectWith(clip_rect);
if (!copy_rect.is_empty()) {
CopyRect(ptr + y_offset,
-frame.stride(),
frame.data() + y_offset,
-frame.stride(),
DesktopFrame::kBytesPerPixel,
copy_rect);
}
}
}
if (!glUnmapBufferARB(GL_PIXEL_PACK_BUFFER_ARB)) {
// If glUnmapBuffer returns false, then the contents of the data store are
// undefined. This might be because the screen mode has changed, in which
// case it will be recreated in ScreenConfigurationChanged, but releasing
// the object here is the best option. Capturing will fall back on
// GlBlitSlow until such time as the pixel buffer object is recreated.
pixel_buffer_object_.Release();
}
glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, 0);
}
void ScreenCapturerMac::GlBlitSlow(const DesktopFrame& frame) {
CGLContextObj CGL_MACRO_CONTEXT = cgl_context_;
glReadBuffer(GL_FRONT);
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
glPixelStorei(GL_PACK_ALIGNMENT, 4); // Force 4-byte alignment.
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
glPixelStorei(GL_PACK_SKIP_ROWS, 0);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
// Read a block of pixels from the frame buffer.
glReadPixels(0, 0, frame.size().width(), frame.size().height(),
GL_BGRA, GL_UNSIGNED_BYTE, frame.data());
glPopClientAttrib();
}
void ScreenCapturerMac::CgBlitPreLion(const DesktopFrame& frame,
const DesktopRegion& region) {
// Copy the entire contents of the previous capture buffer, to capture over.
// TODO(wez): Get rid of this as per crbug.com/145064, or implement
// crbug.com/92354.
if (queue_.previous_frame()) {
memcpy(frame.data(),
queue_.previous_frame()->data(),
frame.stride() * frame.size().height());
}
for (size_t i = 0; i < desktop_config_.displays.size(); ++i) {
const MacDisplayConfiguration& display_config = desktop_config_.displays[i];
// Use deprecated APIs to determine the display buffer layout.
assert(cg_display_base_address_ && cg_display_bytes_per_row_ &&
cg_display_bits_per_pixel_);
uint8_t* display_base_address = reinterpret_cast<uint8_t*>(
(*cg_display_base_address_)(display_config.id));
assert(display_base_address);
int src_bytes_per_row = (*cg_display_bytes_per_row_)(display_config.id);
int src_bytes_per_pixel =
(*cg_display_bits_per_pixel_)(display_config.id) / 8;
// Determine the display's position relative to the desktop, in pixels.
DesktopRect display_bounds = display_config.pixel_bounds;
display_bounds.Translate(-desktop_config_.pixel_bounds.left(),
-desktop_config_.pixel_bounds.top());
// Determine which parts of the blit region, if any, lay within the monitor.
DesktopRegion copy_region = region;
copy_region.IntersectWith(display_bounds);
if (copy_region.is_empty())
continue;
// Translate the region to be copied into display-relative coordinates.
copy_region.Translate(-display_bounds.left(), -display_bounds.top());
// Calculate where in the output buffer the display's origin is.
uint8_t* out_ptr = frame.data() +
(display_bounds.left() * src_bytes_per_pixel) +
(display_bounds.top() * frame.stride());
// Copy the dirty region from the display buffer into our desktop buffer.
for (DesktopRegion::Iterator i(copy_region); !i.IsAtEnd(); i.Advance()) {
CopyRect(display_base_address,
src_bytes_per_row,
out_ptr,
frame.stride(),
src_bytes_per_pixel,
i.rect());
}
}
}
bool ScreenCapturerMac::CgBlitPostLion(const DesktopFrame& frame,
const DesktopRegion& region) {
// Copy the entire contents of the previous capture buffer, to capture over.
// TODO(wez): Get rid of this as per crbug.com/145064, or implement
// crbug.com/92354.
if (queue_.previous_frame()) {
memcpy(frame.data(), queue_.previous_frame()->data(),
frame.stride() * frame.size().height());
}
MacDisplayConfigurations displays_to_capture;
if (current_display_) {
// Capturing a single screen. Note that the screen id may change when
// screens are added or removed.
const MacDisplayConfiguration* config =
desktop_config_.FindDisplayConfigurationById(current_display_);
if (config) {
displays_to_capture.push_back(*config);
} else {
LOG(LS_ERROR) << "The selected screen cannot be found for capturing.";
return false;
}
} else {
// Capturing the whole desktop.
displays_to_capture = desktop_config_.displays;
}
// Create the window list once for all displays.
CFArrayRef window_list = CreateWindowListWithExclusion(excluded_window_);
for (size_t i = 0; i < displays_to_capture.size(); ++i) {
const MacDisplayConfiguration& display_config = displays_to_capture[i];
// Capturing mixed-DPI on one surface is hard, so we only return displays
// that match the "primary" display's DPI. The primary display is always
// the first in the list.
if (i > 0 && display_config.dip_to_pixel_scale !=
displays_to_capture[0].dip_to_pixel_scale) {
continue;
}
// Determine the display's position relative to the desktop, in pixels.
DesktopRect display_bounds = display_config.pixel_bounds;
display_bounds.Translate(-screen_pixel_bounds_.left(),
-screen_pixel_bounds_.top());
// Determine which parts of the blit region, if any, lay within the monitor.
DesktopRegion copy_region = region;
copy_region.IntersectWith(display_bounds);
if (copy_region.is_empty())
continue;
// Translate the region to be copied into display-relative coordinates.
copy_region.Translate(-display_bounds.left(), -display_bounds.top());
DesktopRect excluded_window_bounds;
CGImageRef excluded_image = nullptr;
if (excluded_window_ && window_list) {
// Get the region of the excluded window relative the primary display.
excluded_window_bounds = GetExcludedWindowPixelBounds(
excluded_window_, display_config.dip_to_pixel_scale);
excluded_window_bounds.IntersectWith(display_config.pixel_bounds);
// Create the image under the excluded window first, because it's faster
// than captuing the whole display.
if (!excluded_window_bounds.is_empty()) {
excluded_image = CreateExcludedWindowRegionImage(
excluded_window_bounds, display_config.dip_to_pixel_scale,
window_list);
}
}
// Create an image containing a snapshot of the display.
CGImageRef image = CGDisplayCreateImage(display_config.id);
if (!image) {
if (excluded_image)
CFRelease(excluded_image);
continue;
}
// Verify that the image has 32-bit depth.
int bits_per_pixel = CGImageGetBitsPerPixel(image);
if (bits_per_pixel / 8 != DesktopFrame::kBytesPerPixel) {
LOG(LS_ERROR) << "CGDisplayCreateImage() returned imaged with "
<< bits_per_pixel
<< " bits per pixel. Only 32-bit depth is supported.";
CFRelease(image);
if (excluded_image)
CFRelease(excluded_image);
return false;
}
// Request access to the raw pixel data via the image's DataProvider.
CGDataProviderRef provider = CGImageGetDataProvider(image);
CFDataRef data = CGDataProviderCopyData(provider);
assert(data);
const uint8_t* display_base_address = CFDataGetBytePtr(data);
int src_bytes_per_row = CGImageGetBytesPerRow(image);
// |image| size may be different from display_bounds in case the screen was
// resized recently.
copy_region.IntersectWith(
DesktopRect::MakeWH(CGImageGetWidth(image), CGImageGetHeight(image)));
// Copy the dirty region from the display buffer into our desktop buffer.
uint8_t* out_ptr = frame.GetFrameDataAtPos(display_bounds.top_left());
for (DesktopRegion::Iterator i(copy_region); !i.IsAtEnd(); i.Advance()) {
CopyRect(display_base_address, src_bytes_per_row, out_ptr, frame.stride(),
DesktopFrame::kBytesPerPixel, i.rect());
}
CFRelease(data);
CFRelease(image);
if (excluded_image) {
CGDataProviderRef provider = CGImageGetDataProvider(excluded_image);
CFDataRef excluded_image_data = CGDataProviderCopyData(provider);
assert(excluded_image_data);
display_base_address = CFDataGetBytePtr(excluded_image_data);
src_bytes_per_row = CGImageGetBytesPerRow(excluded_image);
// Translate the bounds relative to the desktop, because |frame| data
// starts from the desktop top-left corner.
DesktopRect window_bounds_relative_to_desktop(excluded_window_bounds);
window_bounds_relative_to_desktop.Translate(-screen_pixel_bounds_.left(),
-screen_pixel_bounds_.top());
DesktopRect rect_to_copy =
DesktopRect::MakeSize(excluded_window_bounds.size());
rect_to_copy.IntersectWith(DesktopRect::MakeWH(
CGImageGetWidth(excluded_image), CGImageGetHeight(excluded_image)));
if (CGImageGetBitsPerPixel(excluded_image) / 8 ==
DesktopFrame::kBytesPerPixel) {
CopyRect(display_base_address, src_bytes_per_row,
frame.GetFrameDataAtPos(
window_bounds_relative_to_desktop.top_left()),
frame.stride(), DesktopFrame::kBytesPerPixel, rect_to_copy);
}
CFRelease(excluded_image_data);
CFRelease(excluded_image);
}
}
if (window_list)
CFRelease(window_list);
return true;
}
void ScreenCapturerMac::ScreenConfigurationChanged() {
if (current_display_) {
const MacDisplayConfiguration* config =
desktop_config_.FindDisplayConfigurationById(current_display_);
screen_pixel_bounds_ = config ? config->pixel_bounds : DesktopRect();
dip_to_pixel_scale_ = config ? config->dip_to_pixel_scale : 1.0f;
} else {
screen_pixel_bounds_ = desktop_config_.pixel_bounds;
dip_to_pixel_scale_ = desktop_config_.dip_to_pixel_scale;
}
// Release existing buffers, which will be of the wrong size.
ReleaseBuffers();
// Clear the dirty region, in case the display is down-sizing.
helper_.ClearInvalidRegion();
// Re-mark the entire desktop as dirty.
helper_.InvalidateScreen(screen_pixel_bounds_.size());
// Make sure the frame buffers will be reallocated.
queue_.Reset();
// CgBlitPostLion uses CGDisplayCreateImage() to snapshot each display's
// contents. Although the API exists in OS 10.6, it crashes the caller if
// the machine has no monitor connected, so we fall back to depcreated APIs
// when running on 10.6.
if (rtc::GetOSVersionName() >= rtc::kMacOSLion) {
LOG(LS_INFO) << "Using CgBlitPostLion.";
// No need for any OpenGL support on Lion
return;
}
// Dynamically link to the deprecated pre-Lion capture APIs.
app_services_library_ = dlopen(kApplicationServicesLibraryName,
RTLD_LAZY);
if (!app_services_library_) {
LOG_F(LS_ERROR) << "Failed to open " << kApplicationServicesLibraryName;
abort();
}
opengl_library_ = dlopen(kOpenGlLibraryName, RTLD_LAZY);
if (!opengl_library_) {
LOG_F(LS_ERROR) << "Failed to open " << kOpenGlLibraryName;
abort();
}
cg_display_base_address_ = reinterpret_cast<CGDisplayBaseAddressFunc>(
dlsym(app_services_library_, "CGDisplayBaseAddress"));
cg_display_bytes_per_row_ = reinterpret_cast<CGDisplayBytesPerRowFunc>(
dlsym(app_services_library_, "CGDisplayBytesPerRow"));
cg_display_bits_per_pixel_ = reinterpret_cast<CGDisplayBitsPerPixelFunc>(
dlsym(app_services_library_, "CGDisplayBitsPerPixel"));
cgl_set_full_screen_ = reinterpret_cast<CGLSetFullScreenFunc>(
dlsym(opengl_library_, "CGLSetFullScreen"));
if (!(cg_display_base_address_ && cg_display_bytes_per_row_ &&
cg_display_bits_per_pixel_ && cgl_set_full_screen_)) {
LOG_F(LS_ERROR);
abort();
}
if (desktop_config_.displays.size() > 1) {
LOG(LS_INFO) << "Using CgBlitPreLion (Multi-monitor).";
return;
}
CGDirectDisplayID mainDevice = CGMainDisplayID();
if (!CGDisplayUsesOpenGLAcceleration(mainDevice)) {
LOG(LS_INFO) << "Using CgBlitPreLion (OpenGL unavailable).";
return;
}
LOG(LS_INFO) << "Using GlBlit";
CGLPixelFormatAttribute attributes[] = {
// This function does an early return if GetOSVersionName() >= kMacOSLion,
// this code only runs on 10.6 and can be deleted once 10.6 support is
// dropped. So just keep using kCGLPFAFullScreen even though it was
// deprecated in 10.6 -- it's still functional there, and it's not used on
// newer OS X versions.
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
kCGLPFAFullScreen,
#pragma clang diagnostic pop
kCGLPFADisplayMask,
(CGLPixelFormatAttribute)CGDisplayIDToOpenGLDisplayMask(mainDevice),
(CGLPixelFormatAttribute)0
};
CGLPixelFormatObj pixel_format = nullptr;
GLint matching_pixel_format_count = 0;
CGLError err = CGLChoosePixelFormat(attributes,
&pixel_format,
&matching_pixel_format_count);
assert(err == kCGLNoError);
err = CGLCreateContext(pixel_format, nullptr, &cgl_context_);
assert(err == kCGLNoError);
CGLDestroyPixelFormat(pixel_format);
(*cgl_set_full_screen_)(cgl_context_);
CGLSetCurrentContext(cgl_context_);
size_t buffer_size = screen_pixel_bounds_.width() *
screen_pixel_bounds_.height() *
sizeof(uint32_t);
pixel_buffer_object_.Init(cgl_context_, buffer_size);
}
bool ScreenCapturerMac::RegisterRefreshAndMoveHandlers() {
desktop_config_ = desktop_config_monitor_->desktop_configuration();
for (const auto& config : desktop_config_.displays) {
size_t pixel_width = config.pixel_bounds.width();
size_t pixel_height = config.pixel_bounds.height();
if (pixel_width == 0 || pixel_height == 0)
continue;
// Using a local variable forces the block to capture the raw pointer.
DisplayStreamManager* manager = display_stream_manager_;
int unique_id = manager->GetUniqueId();
CGDirectDisplayID display_id = config.id;
CGDisplayStreamFrameAvailableHandler handler =
^(CGDisplayStreamFrameStatus status, uint64_t display_time,
IOSurfaceRef frame_surface, CGDisplayStreamUpdateRef updateRef) {
if (status == kCGDisplayStreamFrameStatusStopped) {
manager->DestroyStream(unique_id);
return;
}
if (manager->ShouldIgnoreUpdates())
return;
// Only pay attention to frame updates.
if (status != kCGDisplayStreamFrameStatusFrameComplete)
return;
size_t count = 0;
const CGRect* rects = CGDisplayStreamUpdateGetRects(
updateRef, kCGDisplayStreamUpdateDirtyRects, &count);
if (count != 0) {
// According to CGDisplayStream.h, it's safe to call
// CGDisplayStreamStop() from within the callback.
ScreenRefresh(count, rects);
}
};
CGDisplayStreamRef display_stream = CGDisplayStreamCreate(
display_id, pixel_width, pixel_height, 'BGRA', nullptr, handler);
if (display_stream) {
CGError error = CGDisplayStreamStart(display_stream);
if (error != kCGErrorSuccess)
return false;
CFRunLoopSourceRef source =
CGDisplayStreamGetRunLoopSource(display_stream);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopDefaultMode);
display_stream_manager_->SaveStream(unique_id, display_stream);
}
}
return true;
}
void ScreenCapturerMac::UnregisterRefreshAndMoveHandlers() {
display_stream_manager_->UnregisterActiveStreams();
}
void ScreenCapturerMac::ScreenRefresh(CGRectCount count,
const CGRect* rect_array) {
if (screen_pixel_bounds_.is_empty())
ScreenConfigurationChanged();
DesktopRegion region;
DesktopVector translate_vector =
DesktopVector().subtract(screen_pixel_bounds_.top_left());
for (CGRectCount i = 0; i < count; ++i) {
// Convert from Density-Independent Pixel to physical pixel coordinates.
DesktopRect rect = ScaleAndRoundCGRect(rect_array[i], dip_to_pixel_scale_);
// Translate from local desktop to capturer framebuffer coordinates.
rect.Translate(translate_vector);
region.AddRect(rect);
}
helper_.InvalidateRegion(region);
}
std::unique_ptr<DesktopFrame> ScreenCapturerMac::CreateFrame() {
std::unique_ptr<DesktopFrame> frame(
new BasicDesktopFrame(screen_pixel_bounds_.size()));
frame->set_dpi(DesktopVector(kStandardDPI * dip_to_pixel_scale_,
kStandardDPI * dip_to_pixel_scale_));
return frame;
}
} // namespace
// static
std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawScreenCapturer(
const DesktopCaptureOptions& options) {
if (!options.configuration_monitor())
return nullptr;
std::unique_ptr<ScreenCapturerMac> capturer(
new ScreenCapturerMac(options.configuration_monitor()));
if (!capturer.get()->Init()) {
return nullptr;
}
return capturer;
}
} // namespace webrtc
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