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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "media/video/capture/mac/avfoundation_glue.h"
#include <dlfcn.h>
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/mac/mac_util.h"
#include "media/base/media_switches.h"
namespace {
// This class is used to retrieve AVFoundation NSBundle and library handle. It
// must be used as a LazyInstance so that it is initialised once and in a
// thread-safe way. Normally no work is done in constructors: LazyInstance is
// an exception.
class AVFoundationInternal {
public:
AVFoundationInternal() {
bundle_ = [NSBundle
bundleWithPath:@"/System/Library/Frameworks/AVFoundation.framework"];
const char* path = [[bundle_ executablePath] fileSystemRepresentation];
CHECK(path);
library_handle_ = dlopen(path, RTLD_LAZY | RTLD_LOCAL);
CHECK(library_handle_) << dlerror();
}
NSBundle* bundle() const { return bundle_; }
void* library_handle() const { return library_handle_; }
private:
NSBundle* bundle_;
void* library_handle_;
DISALLOW_COPY_AND_ASSIGN(AVFoundationInternal);
};
} // namespace
static base::LazyInstance<AVFoundationInternal> g_avfoundation_handle =
LAZY_INSTANCE_INITIALIZER;
namespace media {
// TODO(mcasas):http://crbug.com/323536 cache the string pointers.
static NSString* ReadNSStringPtr(const char* symbol) {
NSString** string_pointer = reinterpret_cast<NSString**>(
dlsym(AVFoundationGlue::AVFoundationLibraryHandle(), symbol));
DCHECK(string_pointer) << dlerror();
return *string_pointer;
}
} // namespace media
bool AVFoundationGlue::IsAVFoundationSupported() {
const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
return cmd_line->HasSwitch(switches::kEnableAVFoundation) &&
base::mac::IsOSLionOrLater() && [AVFoundationBundle() load];
}
NSBundle const* AVFoundationGlue::AVFoundationBundle() {
return g_avfoundation_handle.Get().bundle();
}
void* AVFoundationGlue::AVFoundationLibraryHandle() {
return g_avfoundation_handle.Get().library_handle();
}
NSString* AVFoundationGlue::AVCaptureDeviceWasConnectedNotification() {
return media::ReadNSStringPtr("AVCaptureDeviceWasConnectedNotification");
}
NSString* AVFoundationGlue::AVCaptureDeviceWasDisconnectedNotification() {
return media::ReadNSStringPtr("AVCaptureDeviceWasDisconnectedNotification");
}
NSString* AVFoundationGlue::AVMediaTypeVideo() {
return media::ReadNSStringPtr("AVMediaTypeVideo");
}
NSString* AVFoundationGlue::AVMediaTypeAudio() {
return media::ReadNSStringPtr("AVMediaTypeAudio");
}
NSString* AVFoundationGlue::AVMediaTypeMuxed() {
return media::ReadNSStringPtr("AVMediaTypeMuxed");
}
NSString* AVFoundationGlue::AVCaptureSessionRuntimeErrorNotification() {
return media::ReadNSStringPtr("AVCaptureSessionRuntimeErrorNotification");
}
NSString* AVFoundationGlue::AVCaptureSessionDidStopRunningNotification() {
return media::ReadNSStringPtr("AVCaptureSessionDidStopRunningNotification");
}
NSString* AVFoundationGlue::AVCaptureSessionErrorKey() {
return media::ReadNSStringPtr("AVCaptureSessionErrorKey");
}
NSString* AVFoundationGlue::AVCaptureSessionPreset320x240() {
return media::ReadNSStringPtr("AVCaptureSessionPreset320x240");
}
NSString* AVFoundationGlue::AVCaptureSessionPreset640x480() {
return media::ReadNSStringPtr("AVCaptureSessionPreset640x480");
}
NSString* AVFoundationGlue::AVCaptureSessionPreset1280x720() {
return media::ReadNSStringPtr("AVCaptureSessionPreset1280x720");
}
NSString* AVFoundationGlue::AVVideoScalingModeKey() {
return media::ReadNSStringPtr("AVVideoScalingModeKey");
}
NSString* AVFoundationGlue::AVVideoScalingModeResizeAspect() {
return media::ReadNSStringPtr("AVVideoScalingModeResizeAspect");
}
Class AVFoundationGlue::AVCaptureSessionClass() {
return [AVFoundationBundle() classNamed:@"AVCaptureSession"];
}
Class AVFoundationGlue::AVCaptureVideoDataOutputClass() {
return [AVFoundationBundle() classNamed:@"AVCaptureVideoDataOutput"];
}
@implementation AVCaptureDeviceGlue
+ (NSArray*)devices {
Class avcClass =
[AVFoundationGlue::AVFoundationBundle() classNamed:@"AVCaptureDevice"];
if ([avcClass respondsToSelector:@selector(devices)]) {
return [avcClass performSelector:@selector(devices)];
}
return nil;
}
+ (CrAVCaptureDevice*)deviceWithUniqueID:(NSString*)deviceUniqueID {
Class avcClass =
[AVFoundationGlue::AVFoundationBundle() classNamed:@"AVCaptureDevice"];
return [avcClass performSelector:@selector(deviceWithUniqueID:)
withObject:deviceUniqueID];
}
@end // @implementation AVCaptureDeviceGlue
@implementation AVCaptureDeviceInputGlue
+ (CrAVCaptureDeviceInput*)deviceInputWithDevice:(CrAVCaptureDevice*)device
error:(NSError**)outError {
return [[AVFoundationGlue::AVFoundationBundle()
classNamed:@"AVCaptureDeviceInput"] deviceInputWithDevice:device
error:outError];
}
@end // @implementation AVCaptureDeviceInputGlue
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