Extracted media mime type checks from net/base/ into media/base/

media/base/mime_util.h

+// Copyright 2015 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_MIME_UTIL_H__
+#define MEDIA_BASE_MIME_UTIL_H__
+
+#include <string>
+#include <vector>
+
+#include "media/base/media_export.h"
+
+namespace media {
+
+MEDIA_EXPORT bool IsSupportedMediaMimeType(const std::string& mime_type);
+
+// Returns true if and only if all codecs are supported, false otherwise.
+MEDIA_EXPORT bool AreSupportedMediaCodecs(
+    const std::vector<std::string>& codecs);
+
+// Parses a codec string, populating |codecs_out| with the prefix of each codec
+// in the string |codecs_in|. For example, passed "aaa.b.c,dd.eee", if
+// |strip| == true |codecs_out| will contain {"aaa", "dd"}, if |strip| == false
+// |codecs_out| will contain {"aaa.b.c", "dd.eee"}.
+// See http://www.ietf.org/rfc/rfc4281.txt.
+MEDIA_EXPORT void ParseCodecString(const std::string& codecs,
+                                   std::vector<std::string>* codecs_out,
+                                   bool strip);
+
+// Check to see if a particular MIME type is in our list which only supports a
+// certain subset of codecs.
+MEDIA_EXPORT bool IsStrictMediaMimeType(const std::string& mime_type);
+
+// Indicates that the MIME type and (possible codec string) are supported by the
+// underlying platform.
+enum SupportsType {
+  // The underlying platform is known not to support the given MIME type and
+  // codec combination.
+  IsNotSupported,
+
+  // The underlying platform is known to support the given MIME type and codec
+  // combination.
+  IsSupported,
+
+  // The underlying platform is unsure whether the given MIME type and codec
+  // combination can be rendered or not before actually trying to play it.
+  MayBeSupported
+};
+
+// Checks the |mime_type| and |codecs| against the MIME types known to support
+// only a particular subset of codecs.
+// * Returns IsSupported if the |mime_type| is supported and all the codecs
+//   within the |codecs| are supported for the |mime_type|.
+// * Returns MayBeSupported if the |mime_type| is supported and is known to
+//   support only a subset of codecs, but |codecs| was empty. Also returned if
+//   all the codecs in |codecs| are supported, but additional codec parameters
+//   were supplied (such as profile) for which the support cannot be decided.
+// * Returns IsNotSupported if either the |mime_type| is not supported or the
+//   |mime_type| is supported but at least one of the codecs within |codecs| is
+//   not supported for the |mime_type|.
+MEDIA_EXPORT SupportsType IsSupportedStrictMediaMimeType(
+    const std::string& mime_type,
+    const std::vector<std::string>& codecs);
+
+// Test only method that removes proprietary media types and codecs from the
+// list of supported MIME types and codecs. These types and codecs must be
+// removed to ensure consistent layout test results across all Chromium
+// variations.
+MEDIA_EXPORT void RemoveProprietaryMediaTypesAndCodecsForTests();
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MIME_UTIL_H__