2.3版本修改录像编码格式

因为工作中需要将摄像头录像的视频编码格式由h263的改为h264的，所以涉及到这块。

android2.3的视频编码格式由/system/etc/media_profiles.xml文件配设。

下面是修改为h264编码格式的文件。

media_profiles.xml

<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (C) 2010 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 MediaSettings [

<!ELEMENT MediaSettings (CamcorderProfiles,

                         EncoderOutputFileFormat+,

                         VideoEncoderCap+,

                         AudioEncoderCap+,

                         VideoDecoderCap,

                         AudioDecoderCap)>

<!ELEMENT CamcorderProfiles (EncoderProfile+, ImageEncoding+, ImageDecoding, Camera)>

<!ELEMENT EncoderProfile (Video, Audio)>

<!ATTLIST EncoderProfile quality (high|low) #REQUIRED>

<!ATTLIST EncoderProfile fileFormat (mp4|3gp) #REQUIRED>

<!ATTLIST EncoderProfile duration (30|60) #REQUIRED>

<!ELEMENT Video EMPTY>

<!ATTLIST Video codec (h264|h263|m4v) #REQUIRED>

<!ATTLIST Video bitRate CDATA #REQUIRED>

<!ATTLIST Video width CDATA #REQUIRED>

<!ATTLIST Video height CDATA #REQUIRED>

<!ATTLIST Video frameRate CDATA #REQUIRED>

<!ELEMENT Audio EMPTY>

<!ATTLIST Audio codec (amrnb|amrwb|aac) #REQUIRED>

<!ATTLIST Audio bitRate CDATA #REQUIRED>

<!ATTLIST Audio sampleRate CDATA #REQUIRED>

<!ATTLIST Audio channels (1|2) #REQUIRED>

<!ELEMENT ImageEncoding EMPTY>

<!ATTLIST ImageEncoding quality (90|80|70|60|50|40) #REQUIRED>

<!ELEMENT ImageDecoding EMPTY>

<!ATTLIST ImageDecoding memCap CDATA #REQUIRED>

<!ELEMENT Camera EMPTY>

<!ELEMENT EncoderOutputFileFormat EMPTY>

<!ATTLIST EncoderOutputFileFormat name (mp4|3gp) #REQUIRED>

<!ELEMENT VideoEncoderCap EMPTY>

<!ATTLIST VideoEncoderCap name (h264|h263|m4v|wmv) #REQUIRED>

<!ATTLIST VideoEncoderCap enabled (true|false) #REQUIRED>

<!ATTLIST VideoEncoderCap minBitRate CDATA #REQUIRED>

<!ATTLIST VideoEncoderCap maxBitRate CDATA #REQUIRED>

<!ATTLIST VideoEncoderCap minFrameWidth CDATA #REQUIRED>

<!ATTLIST VideoEncoderCap maxFrameWidth CDATA #REQUIRED>

<!ATTLIST VideoEncoderCap minFrameHeight CDATA #REQUIRED>

<!ATTLIST VideoEncoderCap maxFrameHeight CDATA #REQUIRED>

<!ATTLIST VideoEncoderCap minFrameRate CDATA #REQUIRED>

<!ATTLIST VideoEncoderCap maxFrameRate CDATA #REQUIRED>

<!ELEMENT AudioEncoderCap EMPTY>

<!ATTLIST AudioEncoderCap name (amrnb|amrwb|aac|wma) #REQUIRED>

<!ATTLIST AudioEncoderCap enabled (true|false) #REQUIRED>

<!ATTLIST AudioEncoderCap minBitRate CDATA #REQUIRED>

<!ATTLIST AudioEncoderCap maxBitRate CDATA #REQUIRED>

<!ATTLIST AudioEncoderCap minSampleRate CDATA #REQUIRED>

<!ATTLIST AudioEncoderCap maxSampleRate CDATA #REQUIRED>

<!ATTLIST AudioEncoderCap minChannels (1|2) #REQUIRED>

<!ATTLIST AudioEncoderCap maxChannels (1|2) #REQUIRED>

<!ELEMENT VideoDecoderCap EMPTY>

<!ATTLIST VideoDecoderCap name (wmv) #REQUIRED>

<!ATTLIST VideoDecoderCap enabled (true|false) #REQUIRED>

<!ELEMENT AudioDecoderCap EMPTY>

<!ATTLIST AudioDecoderCap name (wma) #REQUIRED>

<!ATTLIST AudioDecoderCap enabled (true|false) #REQUIRED>

]>

<!--

     This file is used to declare the multimedia profiles and capabilities

     on an android-powered device.

-->

<MediaSettings>

    <!-- Each camcorder profile defines a set of predefined configuration parameters -->

    <CamcorderProfiles>

        <!--

        <EncoderProfile quality="hd" fileFormat="mp4" duration="60">

            <Video codec="h264"

                   bitRate="6000000"

                   width="1280"

                   height="720"

                   frameRate="24" />

            <Audio codec="aac"

                    bitRate="96000"

                    sampleRate="16000"

                    channels="1" />

        </EncoderProfile>

        -->

        <EncoderProfile quality="high" fileFormat="3gp" duration="600">

            <Video codec="h264"

                   bitRate="360000"

                   width="640"

                   height="480"

                   frameRate="18" />

            <Audio codec="amrnb"

                   bitRate="12200"

                   sampleRate="8000"

                   channels="1" />

        </EncoderProfile>

        <EncoderProfile quality="low" fileFormat="3gp" duration="30">

            <Video codec="h264"

                   bitRate="192000"

                   width="320"

                   height="240"

                   frameRate="18" />

            <Audio codec="amrnb"

                   bitRate="12200"

                   sampleRate="8000"

                   channels="1" />

        </EncoderProfile>

        <ImageEncoding quality="90" />

        <ImageEncoding quality="80" />

        <ImageEncoding quality="70" />

        <ImageDecoding memCap="20000000" />

    </CamcorderProfiles>

    <EncoderOutputFileFormat name="3gp" />

    <EncoderOutputFileFormat name="mp4" />

    <!--

         If a codec is not enabled, it is invisible to the applications

         In other words, the applications won't be able to use the codec

         or query the capabilities of the codec at all if it is disabled

    -->

    <VideoEncoderCap name="h264" enabled="true"

        minBitRate="64000" maxBitRate="3000000"

        minFrameWidth="176" maxFrameWidth="800"

        minFrameHeight="144" maxFrameHeight="480"

        minFrameRate="27" maxFrameRate="27" />

    <VideoEncoderCap name="h263" enabled="false"

        minBitRate="64000" maxBitRate="1000000"

        minFrameWidth="176" maxFrameWidth="800"

        minFrameHeight="144" maxFrameHeight="480"

        minFrameRate="27" maxFrameRate="27" />

    <VideoEncoderCap name="m4v" enabled="true"

        minBitRate="192000" maxBitRate="360000"

        minFrameWidth="320" maxFrameWidth="640"

        minFrameHeight="240" maxFrameHeight="480"

        minFrameRate="18" maxFrameRate="18" />

    <AudioEncoderCap name="aac" enabled="false"

        minBitRate="8192" maxBitRate="96000"

        minSampleRate="8000" maxSampleRate="16000"

        minChannels="1" maxChannels="1" />

    <AudioEncoderCap name="amrwb" enabled="false"

        minBitRate="6600" maxBitRate="23050"

        minSampleRate="16000" maxSampleRate="16000"

        minChannels="1" maxChannels="1" />

    <AudioEncoderCap name="amrnb" enabled="true"

        minBitRate="5525" maxBitRate="12200"

        minSampleRate="8000" maxSampleRate="8000"

        minChannels="1" maxChannels="1" />

    <!--

        FIXME:

        We do not check decoder capabilities at present

        At present, we only check whether windows media is visible

        for TEST applications. For other applications, we do

        not perform any checks at all.

    -->

    <VideoDecoderCap name="wmv" enabled="false"/>

    <AudioDecoderCap name="wma" enabled="false"/>

</MediaSettings>