WebM support for new multipart VP9 string.

media/base/mime_util_internal.h

Index: media/base/mime_util_internal.h
diff --git a/media/base/mime_util_internal.h b/media/base/mime_util_internal.h
index b0f724e1d0b9e4d535e532ef4ad236da95954bac..704acbb2b078020c0e249b4da3e06fa55c3fba3a 100644
--- a/media/base/mime_util_internal.h
+++ b/media/base/mime_util_internal.h
@@ -113,12 +113,16 @@ class MEDIA_EXPORT MimeUtil {
   // whenever |codec_id| is incomplete/invalid, or in some cases when
   // |ambiguous_codec_string| is set to true.
   // |is_encrypted| means the codec will be used with encrypted blocks.
+  // |out_eotf| is the electro-optical transfer function described by the
+  // |codec_id|. Will be gfx::ColorSpace::TransferID::INVALID for many codec
+  // strings where EOTF is not described.

[servolk, 2017/03/02 18:56:36]

Yes, VP9 is the only codec that will have eotf in the codec id. H.264 / HEVC
don't have it and AFAIK are not planning to add eotf in the future.

[chcunningham, 2017/03/02 23:13:08]

Ack. This comment is actually stale. I'm planning to default eotf to BT709 when
its not supplied in the codec string (following what we already do for color
space in https://crrev.com/1221903003/). 

For HEVC I wonder if eotf is signalled in the mime via the "up to 6 constraint
bytes, bytes are dot-separated and hex-encoded." Or does HEVC imply a particular
(singular) EOTF would be used? 

   bool ParseCodecString(const std::string& mime_type_lower_case,
                         const std::string& codec_id,
                         Codec* codec,
                         bool* ambiguous_codec_string,
                         VideoCodecProfile* out_profile,
-                        uint8_t* out_level) const;
+                        uint8_t* out_level,
+                        gfx::ColorSpace::TransferID* out_eotf) const;
 
   // Returns IsSupported if |codec| when platform supports codec contained in
   // |mime_type_lower_case|. Returns MayBeSupported when platform support is
@@ -132,6 +136,7 @@ class MEDIA_EXPORT MimeUtil {
                                 Codec codec,
                                 VideoCodecProfile video_profile,
                                 uint8_t video_level,
+                                gfx::ColorSpace::TransferID eotf,
                                 bool is_encrypted) const;
 
   // Wrapper around IsCodecSupported for simple codecs that are entirely