H264 HW encode using VideoToolbox

media/base/mac/videotoolbox_glue.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_BASE_MAC_VIDEOTOOLBOX_GLUE_H_
 #define MEDIA_BASE_MAC_VIDEOTOOLBOX_GLUE_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "media/base/mac/coremedia_glue.h"
 #include "media/base/media_export.h"
 
-// VideoToolbox API is available in OS X 10.9 and iOS 8 (10.8 has support for
-// software encoding, but this class exposes the 10.9 API level). Chromium
-// requires OS X 10.6 or iOS 6. Linking with VideoToolbox therefore has to
-// happen at runtime. This class is defined to try and load the VideoToolbox
-// library. If it succeeds, clients can use VideoToolbox via this class.
+// VideoToolbox API is available in and after OS X 10.9 and iOS 8 (10.8 has
+// support for software encoding, but this class exposes the 10.9 API level).
+// Chromium requires OS X 10.9 or iOS 9. This class is defined to try and load
+// the VideoToolbox library at runtime. If it succeeds, clients can use
+// VideoToolbox via this class.
+// Note that this file is necessary because Chromium still targets OS X 10.6 for
+// deployment. It should be deprecated soon, see crbug.com/579648.
 class MEDIA_EXPORT VideoToolboxGlue {
  public:
   class Loader;
 
   // Returns a glue object if VideoToolbox is supported or null otherwise.
   // Using a glue object allows to avoid expensive atomic operations on every
   // function call. The object has process life duration and must not be
   // deleted.
   static const VideoToolboxGlue* Get();
 
@@ skipping 13 matching lines @@
       VTEncodeInfoFlags infoFlags,
       CoreMediaGlue::CMSampleBufferRef sampleBuffer);
 
   // Originally from VTSession.h
   typedef CFTypeRef VTSessionRef;
 
   // Originally from VTCompressionProperties.h
   CFStringRef kVTCompressionPropertyKey_AllowFrameReordering() const;
   CFStringRef kVTCompressionPropertyKey_AverageBitRate() const;
   CFStringRef kVTCompressionPropertyKey_ColorPrimaries() const;
+  CFStringRef kVTCompressionPropertyKey_DataRateLimits() const;
   CFStringRef kVTCompressionPropertyKey_ExpectedFrameRate() const;
   CFStringRef kVTCompressionPropertyKey_MaxFrameDelayCount() const;
   CFStringRef kVTCompressionPropertyKey_MaxKeyFrameInterval() const;
   CFStringRef kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration() const;
   CFStringRef kVTCompressionPropertyKey_ProfileLevel() const;
   CFStringRef kVTCompressionPropertyKey_RealTime() const;
   CFStringRef kVTCompressionPropertyKey_TransferFunction() const;
   CFStringRef kVTCompressionPropertyKey_YCbCrMatrix() const;
 
   CFStringRef kVTEncodeFrameOptionKey_ForceKeyFrame() const;
 
   CFStringRef kVTProfileLevel_H264_Baseline_AutoLevel() const;
   CFStringRef kVTProfileLevel_H264_Main_AutoLevel() const;
   CFStringRef kVTProfileLevel_H264_Extended_AutoLevel() const;
   CFStringRef kVTProfileLevel_H264_High_AutoLevel() const;
 
   CFStringRef
       kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder()
       const;
+  CFStringRef
+  kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder() const;
 
   // Originally from VTCompressionSession.h
   OSStatus VTCompressionSessionCreate(
       CFAllocatorRef allocator,
       int32_t width,
       int32_t height,
       CoreMediaGlue::CMVideoCodecType codecType,
       CFDictionaryRef encoderSpecification,
       CFDictionaryRef sourceImageBufferAttributes,
       CFAllocatorRef compressedDataAllocator,
@@ skipping 21 matching lines @@
                                 CFTypeRef propertyValue) const;
 
  private:
   struct Library;
   VideoToolboxGlue();
   Library* library_;
   DISALLOW_COPY_AND_ASSIGN(VideoToolboxGlue);
 };
 
 #endif  // MEDIA_BASE_MAC_VIDEOTOOLBOX_GLUE_H_