| // Copyright 2012 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_INTERNAL_H_ |
| #define MEDIA_BASE_MIME_UTIL_INTERNAL_H_ |
| |
| #include <string> |
| #include <vector> |
| |
| #include "base/containers/flat_map.h" |
| #include "base/containers/flat_set.h" |
| #include "base/macros.h" |
| #include "media/base/media_export.h" |
| #include "media/base/mime_util.h" |
| #include "media/base/video_codecs.h" |
| #include "media/base/video_color_space.h" |
| |
| namespace media { |
| |
| namespace internal { |
| |
| // Internal utility class for handling mime types. Should only be invoked by |
| // tests and the functions within mime_util.cc -- NOT for direct use by others. |
| class MEDIA_EXPORT MimeUtil { |
| public: |
| MimeUtil(); |
| ~MimeUtil(); |
| |
| enum Codec { |
| INVALID_CODEC, |
| PCM, |
| MP3, |
| AC3, |
| EAC3, |
| MPEG2_AAC, |
| MPEG4_AAC, |
| VORBIS, |
| OPUS, |
| FLAC, |
| H264, |
| HEVC, |
| VP8, |
| VP9, |
| THEORA, |
| DOLBY_VISION, |
| AV1, |
| MPEG_H_AUDIO, |
| LAST_CODEC = MPEG_H_AUDIO |
| }; |
| |
| // Platform configuration structure. Controls which codecs are supported at |
| // runtime. Also used by tests to simulate platform differences. |
| struct PlatformInfo { |
| bool has_platform_decoders = false; |
| |
| bool has_platform_vp8_decoder = false; |
| bool has_platform_vp9_decoder = false; |
| bool supports_opus = false; |
| }; |
| |
| struct ParsedCodecResult { |
| Codec codec; |
| bool is_ambiguous; |
| VideoCodecProfile video_profile; |
| uint8_t video_level; |
| VideoColorSpace video_color_space; |
| }; |
| |
| // See mime_util.h for more information on these methods. |
| bool IsSupportedMediaMimeType(const std::string& mime_type) const; |
| void SplitCodecs(const std::string& codecs, |
| std::vector<std::string>* codecs_out); |
| void StripCodecs(std::vector<std::string>* codecs); |
| bool ParseVideoCodecString(const std::string& mime_type, |
| const std::string& codec_id, |
| bool* out_is_ambiguous, |
| VideoCodec* out_codec, |
| VideoCodecProfile* out_profile, |
| uint8_t* out_level, |
| VideoColorSpace* out_color_space); |
| bool ParseAudioCodecString(const std::string& mime_type, |
| const std::string& codec_id, |
| bool* out_is_ambiguous, |
| AudioCodec* out_codec); |
| SupportsType IsSupportedMediaFormat(const std::string& mime_type, |
| const std::vector<std::string>& codecs, |
| bool is_encrypted) const; |
| |
| // Checks android platform specific codec restrictions. Returns true if |
| // |codec| is supported when contained in |mime_type_lower_case|. |
| // |is_encrypted| means the codec will be used with encrypted blocks. |
| // |platform_info| describes the availability of various platform features; |
| // see PlatformInfo for more details. |
| static bool IsCodecSupportedOnAndroid(Codec codec, |
| const std::string& mime_type_lower_case, |
| bool is_encrypted, |
| const PlatformInfo& platform_info); |
| |
| private: |
| typedef base::flat_set<int> CodecSet; |
| typedef base::flat_map<std::string, CodecSet> MediaFormatMappings; |
| |
| // Initializes the supported media types into hash sets for faster lookup. |
| void InitializeMimeTypeMaps(); |
| |
| // Initializes the supported media formats (|media_format_map_|). |
| void AddSupportedMediaFormats(); |
| |
| // Adds |mime_type| with the specified codecs to |media_format_map_|. |
| void AddContainerWithCodecs(const std::string& mime_type, |
| const CodecSet& codecs_list); |
| |
| // Returns IsSupported if all codec IDs in |codecs| are unambiguous and are |
| // supported in |mime_type_lower_case|. MayBeSupported is returned if at least |
| // one codec ID in |codecs| is ambiguous but all the codecs are supported. |
| // IsNotSupported is returned if |mime_type_lower_case| is not supported or at |
| // least one is not supported in |mime_type_lower_case|. |is_encrypted| means |
| // the codec will be used with encrypted blocks. |
| SupportsType AreSupportedCodecs( |
| const std::vector<ParsedCodecResult>& parsed_codecs, |
| const std::string& mime_type_lower_case, |
| bool is_encrypted) const; |
| |
| // Parse the combination of |mime_type_lower_case| and |codecs|. Returns true |
| // when parsing succeeds and output is written to |out_results|. Returns false |
| // when parsing fails. Failure may be caused by |
| // - invalid/unrecognized codec strings and mime_types |
| // - invalid combinations of codec strings and mime_types (e.g. H264 in WebM) |
| // See comment for ParseCodecHelper(). |
| bool ParseCodecStrings(const std::string& mime_type_lower_case, |
| const std::vector<std::string>& codecs, |
| std::vector<ParsedCodecResult>* out_results) const; |
| |
| // Helper to ParseCodecStrings(). Parses a single |codec_id| with |
| // |mime_type_lower_case| to populate the fields of |out_result|. This helper |
| // method does not validate the combination of |mime_type_lower_case| and |
| // |codec_id|, nor does it handle empty/unprovided codecs; See caller |
| // ParseCodecStrings(). |
| // |
| // |out_result| is only valid when this method returns true (parsing success). |
| // |out_result->is_ambiguous| will be set to true when the codec string |
| // matches one of a fixed number of *non-RFC compliant* strings (e.g. "avc"). |
| // Ambiguous video codec strings may fail to provide video profile and/or |
| // level info. In these cases, we use the following values to indicate |
| // "unspecified": |
| // - out_result->video_profile = VIDEO_CODEC_PROFILE_UNKNOWN |
| // - out_result->video_level = 0 |
| // |
| // For unambiguous video codecs, |video_profile| and |video_level| will be |
| // set in |out_result|. |
| // |
| // |out_result|'s |video_color_space| will report the codec strings color |
| // space when provided. Most codec strings do not yet describe color, so this |
| // will often be set to the default of REC709. |
| bool ParseCodecHelper(const std::string& mime_type_lower_case, |
| const std::string& codec_id, |
| ParsedCodecResult* out_result) const; |
| |
| // Returns IsSupported if |codec| when platform supports codec contained in |
| // |mime_type_lower_case|. Returns MayBeSupported when platform support is |
| // unclear. Otherwise returns NotSupported. Note: This method will always |
| // return NotSupported for proprietary codecs if |allow_proprietary_codecs_| |
| // is set to false. |is_encrypted| means the codec will be used with encrypted |
| // blocks. |
| // TODO(chcunningham): Make this method return a bool. Platform support should |
| // always be knowable for a fully specified codec. |
| SupportsType IsCodecSupported(const std::string& mime_type_lower_case, |
| Codec codec, |
| VideoCodecProfile video_profile, |
| uint8_t video_level, |
| const VideoColorSpace& eotf, |
| bool is_encrypted) const; |
| |
| // Returns true if |codec| refers to a proprietary codec. |
| bool IsCodecProprietary(Codec codec) const; |
| |
| // Returns true and sets |*default_codec| if |mime_type_lower_case| has a |
| // default codec associated with it. Returns false otherwise and the value of |
| // |*default_codec| is undefined. |
| bool GetDefaultCodec(const std::string& mime_type_lower_case, |
| Codec* default_codec) const; |
| |
| #if defined(OS_ANDROID) |
| // Indicates the support of various codecs within the platform. |
| PlatformInfo platform_info_; |
| #endif |
| |
| // A map of mime_types and hash map of the supported codecs for the mime_type. |
| MediaFormatMappings media_format_map_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MimeUtil); |
| }; |
| |
| } // namespace internal |
| } // namespace media |
| |
| #endif // MEDIA_BASE_MIME_UTIL_INTERNAL_H_ |
