<?xml version ="1.0" encoding ="utf-8" ?><!-- Copyright (C) 2012 The Android Open Source Project Licensed under the Apache License , Version 2 . 0 ( the " License " ) ; you may not use this file except in compliance with the License . You may obtain a copy of the License at http : / / www . apache . org / licenses / LICENSE - 2 . 0 Unless required by applicable law or agreed to in writing , software distributed under the License is distributed on an " AS IS " BASIS , WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND , either express or implied . See the License for the specific language governing permissions and limitations under the License . <!--< ! DOCTYPE MediaCodecs [ < ! ELEMENT MediaCodecs ( Decoders , Encoders ) > < ! ELEMENT Decoders ( MediaCodec * ) > < ! ELEMENT Encoders ( MediaCodec * ) > < ! ELEMENT MediaCodec ( Type * , Quirk * ) > < ! ATTLIST MediaCodec name CDATA # REQUIRED > < ! ATTLIST MediaCodec type CDATA > < ! ELEMENT Type EMPTY > < ! ATTLIST Type name CDATA # REQUIRED > < ! ELEMENT Quirk EMPTY > < ! ATTLIST Quirk name CDATA # REQUIRED > ] > There ' s a simple and a complex syntax to declare the availability of a media codec : A codec that properly follows the OpenMax spec and therefore doesn ' t have any quirks and that only supports a single content type can be declared like so : < MediaCodec name = " OMX . foo . bar " type = " something / interesting " / > If a codec has quirks OR supports multiple content types , the following syntax can be used : < MediaCodec name = " OMX . foo . bar " > < Type name = " something / interesting " / > < Type name = " something / else " / > . . . < Quirk name = " requires - allocate - on - input - ports " / > < Quirk name = " requires - allocate - on - output - ports " / > < Quirk name = " output - buffers - are - unreadable " / > < / MediaCodec > Only the three quirks included above are recognized at this point : " requires - allocate - on - input - ports " must be advertised if the component does not properly support specification of input buffers using the OMX_UseBuffer ( . . . ) API but instead requires OMX_AllocateBuffer to be used . " requires - allocate - on - output - ports " must be advertised if the component does not properly support specification of output buffers using the OMX_UseBuffer ( . . . ) API but instead requires OMX_AllocateBuffer to be used . " output - buffers - are - unreadable " must be advertised if the emitted output buffers of a decoder component are not readable , i . e . use a custom format even though abusing one of the official OMX colorspace constants . Clients of such decoders will not be able to access the decoded data , naturally making the component much less useful . The only use for a component with this quirk is to render the output to the screen . Audio decoders MUST NOT advertise this quirk . Video decoders that advertise this quirk must be accompanied by a corresponding color space converter for thumbnail extraction , matching surfaceflinger support that can render the custom format to a texture and possibly other code , so just DON ' T USE THIS QUIRK . Include href ="media_codecs_google_audio.xml" />Include href ="media_codecs_google_video.xml" />
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