Move Mac media glue code from media/video/capture/mac to media/base/mac

media/video/capture/mac/coremedia_glue.mm

-// 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.
-
-#include "media/video/capture/mac/coremedia_glue.h"
-
-#include <dlfcn.h>
-
-#include "base/logging.h"
-#include "base/lazy_instance.h"
-
-namespace {
-
-// This class is used to retrieve some CoreMedia library functions. 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 CoreMediaLibraryInternal {
- public:
-  typedef CoreMediaGlue::CMTime (*CMTimeMakeMethod)(int64_t, int32_t);
-  typedef CVImageBufferRef (*CMSampleBufferGetImageBufferMethod)(
-      CoreMediaGlue::CMSampleBufferRef);
-  typedef FourCharCode (*CMFormatDescriptionGetMediaSubTypeMethod)(
-      CoreMediaGlue::CMFormatDescriptionRef desc);
-  typedef CoreMediaGlue::CMVideoDimensions
-      (*CMVideoFormatDescriptionGetDimensionsMethod)(
-          CoreMediaGlue::CMVideoFormatDescriptionRef videoDesc);
-
-  CoreMediaLibraryInternal() {
-    NSBundle* bundle = [NSBundle
-        bundleWithPath:@"/System/Library/Frameworks/CoreMedia.framework"];
-
-    const char* path = [[bundle executablePath] fileSystemRepresentation];
-    CHECK(path);
-    void* library_handle = dlopen(path, RTLD_LAZY | RTLD_LOCAL);
-    CHECK(library_handle) << dlerror();
-
-    // Now extract the methods.
-    cm_time_make_ = reinterpret_cast<CMTimeMakeMethod>(
-        dlsym(library_handle, "CMTimeMake"));
-    CHECK(cm_time_make_) << dlerror();
-
-    cm_sample_buffer_get_image_buffer_method_ =
-        reinterpret_cast<CMSampleBufferGetImageBufferMethod>(
-            dlsym(library_handle, "CMSampleBufferGetImageBuffer"));
-    CHECK(cm_sample_buffer_get_image_buffer_method_) << dlerror();
-
-    cm_format_description_get_media_sub_type_method_ =
-        reinterpret_cast<CMFormatDescriptionGetMediaSubTypeMethod>(
-            dlsym(library_handle, "CMFormatDescriptionGetMediaSubType"));
-    CHECK(cm_format_description_get_media_sub_type_method_) << dlerror();
-
-    cm_video_format_description_get_dimensions_method_ =
-        reinterpret_cast<CMVideoFormatDescriptionGetDimensionsMethod>(
-            dlsym(library_handle, "CMVideoFormatDescriptionGetDimensions"));
-    CHECK(cm_video_format_description_get_dimensions_method_) << dlerror();
-  }
-
-  const CMTimeMakeMethod& cm_time_make() const { return cm_time_make_; }
-  const CMSampleBufferGetImageBufferMethod&
-      cm_sample_buffer_get_image_buffer_method() const {
-    return cm_sample_buffer_get_image_buffer_method_;
-  }
-  const CMFormatDescriptionGetMediaSubTypeMethod&
-      cm_format_description_get_media_sub_type_method() const {
-    return cm_format_description_get_media_sub_type_method_;
-  }
-  const CMVideoFormatDescriptionGetDimensionsMethod&
-      cm_video_format_description_get_dimensions_method() const {
-    return cm_video_format_description_get_dimensions_method_;
-  }
-
- private:
-  CMTimeMakeMethod cm_time_make_;
-  CMSampleBufferGetImageBufferMethod cm_sample_buffer_get_image_buffer_method_;
-  CMFormatDescriptionGetMediaSubTypeMethod
-      cm_format_description_get_media_sub_type_method_;
-  CMVideoFormatDescriptionGetDimensionsMethod
-      cm_video_format_description_get_dimensions_method_;
-
-  DISALLOW_COPY_AND_ASSIGN(CoreMediaLibraryInternal);
-};
-
-}  // namespace
-
-static base::LazyInstance<CoreMediaLibraryInternal> g_coremedia_handle =
-    LAZY_INSTANCE_INITIALIZER;
-
-// static
-CoreMediaGlue::CMTime CoreMediaGlue::CMTimeMake(int64_t value,
-                                                int32_t timescale) {
-  return g_coremedia_handle.Get().cm_time_make()(value, timescale);
-}
-
-// static
-CVImageBufferRef CoreMediaGlue::CMSampleBufferGetImageBuffer(
-    CMSampleBufferRef buffer) {
-  return g_coremedia_handle.Get().cm_sample_buffer_get_image_buffer_method()(
-      buffer);
-}
-
-// static
-FourCharCode CoreMediaGlue::CMFormatDescriptionGetMediaSubType(
-      CMFormatDescriptionRef desc) {
-  return g_coremedia_handle.Get()
-      .cm_format_description_get_media_sub_type_method()(desc);
-}
-
-// static
-CoreMediaGlue::CMVideoDimensions
-    CoreMediaGlue::CMVideoFormatDescriptionGetDimensions(
-        CMVideoFormatDescriptionRef videoDesc) {
-  return g_coremedia_handle.Get()
-      .cm_video_format_description_get_dimensions_method()(videoDesc);
-}