Tiny4412 Android5.0 定制media codecs相关的格式(二)
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http://blog.csdn.net/morixinguan/article/details/73149058
上一节说到4412的在Android 5.0源代码中支持了许多的格式，那么这些格式最终又是怎么确定的呢？
找到以下这个文件:
android-5.0.2/frameworks/base/media/java\android/media/MediaFile.java
/* * Copyright (C) 2007 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. */package android.media;import android.media.DecoderCapabilities;import android.media.DecoderCapabilities.VideoDecoder;import android.media.DecoderCapabilities.AudioDecoder;import android.mtp.MtpConstants;import java.util.HashMap;import java.util.List;import java.util.Locale;/** * MediaScanner helper class. * * {@hide} */public class MediaFile {//定义变量，用来描述对应的格式的变量 // Audio file types public static final int FILE_TYPE_MP3 = 1; public static final int FILE_TYPE_M4A = 2; public static final int FILE_TYPE_WAV = 3; public static final int FILE_TYPE_AMR = 4; public static final int FILE_TYPE_AWB = 5; public static final int FILE_TYPE_WMA = 6; public static final int FILE_TYPE_OGG = 7; public static final int FILE_TYPE_AAC = 8; public static final int FILE_TYPE_MKA = 9; public static final int FILE_TYPE_FLAC = 10; private static final int FIRST_AUDIO_FILE_TYPE = FILE_TYPE_MP3; private static final int LAST_AUDIO_FILE_TYPE = FILE_TYPE_FLAC; // MIDI file types public static final int FILE_TYPE_MID = 11; public static final int FILE_TYPE_SMF = 12; public static final int FILE_TYPE_IMY = 13; private static final int FIRST_MIDI_FILE_TYPE = FILE_TYPE_MID; private static final int LAST_MIDI_FILE_TYPE = FILE_TYPE_IMY; // Video file types public static final int FILE_TYPE_MP4 = 21; public static final int FILE_TYPE_M4V = 22; public static final int FILE_TYPE_3GPP = 23; public static final int FILE_TYPE_3GPP2 = 24; public static final int FILE_TYPE_WMV = 25; public static final int FILE_TYPE_ASF = 26; public static final int FILE_TYPE_MKV = 27; public static final int FILE_TYPE_MP2TS = 28; public static final int FILE_TYPE_AVI = 29; public static final int FILE_TYPE_WEBM = 30; private static final int FIRST_VIDEO_FILE_TYPE = FILE_TYPE_MP4; private static final int LAST_VIDEO_FILE_TYPE = FILE_TYPE_WEBM; // More video file types public static final int FILE_TYPE_MP2PS = 200; private static final int FIRST_VIDEO_FILE_TYPE2 = FILE_TYPE_MP2PS; private static final int LAST_VIDEO_FILE_TYPE2 = FILE_TYPE_MP2PS; // Image file types public static final int FILE_TYPE_JPEG = 31; public static final int FILE_TYPE_GIF = 32; public static final int FILE_TYPE_PNG = 33; public static final int FILE_TYPE_BMP = 34; public static final int FILE_TYPE_WBMP = 35; public static final int FILE_TYPE_WEBP = 36; private static final int FIRST_IMAGE_FILE_TYPE = FILE_TYPE_JPEG; private static final int LAST_IMAGE_FILE_TYPE = FILE_TYPE_WEBP; // Playlist file types public static final int FILE_TYPE_M3U = 41; public static final int FILE_TYPE_PLS = 42; public static final int FILE_TYPE_WPL = 43; public static final int FILE_TYPE_HTTPLIVE = 44; private static final int FIRST_PLAYLIST_FILE_TYPE = FILE_TYPE_M3U; private static final int LAST_PLAYLIST_FILE_TYPE = FILE_TYPE_HTTPLIVE; // Drm file types public static final int FILE_TYPE_FL = 51; private static final int FIRST_DRM_FILE_TYPE = FILE_TYPE_FL; private static final int LAST_DRM_FILE_TYPE = FILE_TYPE_FL; // Other popular file types public static final int FILE_TYPE_TEXT = 100; public static final int FILE_TYPE_HTML = 101; public static final int FILE_TYPE_PDF = 102; public static final int FILE_TYPE_XML = 103; public static final int FILE_TYPE_MS_WORD = 104; public static final int FILE_TYPE_MS_EXCEL = 105; public static final int FILE_TYPE_MS_POWERPOINT = 106; public static final int FILE_TYPE_ZIP = 107; public static class MediaFileType { public final int fileType; public final String mimeType; MediaFileType(int fileType, String mimeType) { this.fileType = fileType; this.mimeType = mimeType; } } private static final HashMap<String, MediaFileType> sFileTypeMap = new HashMap<String, MediaFileType>(); private static final HashMap<String, Integer> sMimeTypeMap = new HashMap<String, Integer>(); // maps file extension to MTP format code private static final HashMap<String, Integer> sFileTypeToFormatMap = new HashMap<String, Integer>(); // maps mime type to MTP format code private static final HashMap<String, Integer> sMimeTypeToFormatMap = new HashMap<String, Integer>(); // maps MTP format code to mime type private static final HashMap<Integer, String> sFormatToMimeTypeMap = new HashMap<Integer, String>(); static void addFileType(String extension, int fileType, String mimeType) { sFileTypeMap.put(extension, new MediaFileType(fileType, mimeType)); sMimeTypeMap.put(mimeType, Integer.valueOf(fileType)); } static void addFileType(String extension, int fileType, String mimeType, int mtpFormatCode) { addFileType(extension, fileType, mimeType); sFileTypeToFormatMap.put(extension, Integer.valueOf(mtpFormatCode)); sMimeTypeToFormatMap.put(mimeType, Integer.valueOf(mtpFormatCode)); sFormatToMimeTypeMap.put(mtpFormatCode, mimeType); } private static boolean isWMAEnabled() { List<AudioDecoder> decoders = DecoderCapabilities.getAudioDecoders(); int count = decoders.size(); for (int i = 0; i < count; i++) { AudioDecoder decoder = decoders.get(i); if (decoder == AudioDecoder.AUDIO_DECODER_WMA) { return true; } } return false; } private static boolean isWMVEnabled() { List<VideoDecoder> decoders = DecoderCapabilities.getVideoDecoders(); int count = decoders.size(); for (int i = 0; i < count; i++) { VideoDecoder decoder = decoders.get(i); if (decoder == VideoDecoder.VIDEO_DECODER_WMV) { return true; } } return false; } static {//添加对应的音频、视频、图片的格式 addFileType("MP3", FILE_TYPE_MP3, "audio/mpeg", MtpConstants.FORMAT_MP3); addFileType("MPGA", FILE_TYPE_MP3, "audio/mpeg", MtpConstants.FORMAT_MP3); addFileType("M4A", FILE_TYPE_M4A, "audio/mp4", MtpConstants.FORMAT_MPEG); addFileType("WAV", FILE_TYPE_WAV, "audio/x-wav", MtpConstants.FORMAT_WAV); addFileType("AMR", FILE_TYPE_AMR, "audio/amr"); addFileType("AWB", FILE_TYPE_AWB, "audio/amr-wb"); if (isWMAEnabled()) { addFileType("WMA", FILE_TYPE_WMA, "audio/x-ms-wma", MtpConstants.FORMAT_WMA); } addFileType("OGG", FILE_TYPE_OGG, "audio/ogg", MtpConstants.FORMAT_OGG); addFileType("OGG", FILE_TYPE_OGG, "application/ogg", MtpConstants.FORMAT_OGG); addFileType("OGA", FILE_TYPE_OGG, "application/ogg", MtpConstants.FORMAT_OGG); addFileType("AAC", FILE_TYPE_AAC, "audio/aac", MtpConstants.FORMAT_AAC); addFileType("AAC", FILE_TYPE_AAC, "audio/aac-adts", MtpConstants.FORMAT_AAC); addFileType("MKA", FILE_TYPE_MKA, "audio/x-matroska"); addFileType("MID", FILE_TYPE_MID, "audio/midi"); addFileType("MIDI", FILE_TYPE_MID, "audio/midi"); addFileType("XMF", FILE_TYPE_MID, "audio/midi"); addFileType("RTTTL", FILE_TYPE_MID, "audio/midi"); addFileType("SMF", FILE_TYPE_SMF, "audio/sp-midi"); addFileType("IMY", FILE_TYPE_IMY, "audio/imelody"); addFileType("RTX", FILE_TYPE_MID, "audio/midi"); addFileType("OTA", FILE_TYPE_MID, "audio/midi"); addFileType("MXMF", FILE_TYPE_MID, "audio/midi"); addFileType("MPEG", FILE_TYPE_MP4, "video/mpeg", MtpConstants.FORMAT_MPEG); addFileType("MPG", FILE_TYPE_MP4, "video/mpeg", MtpConstants.FORMAT_MPEG); addFileType("MP4", FILE_TYPE_MP4, "video/mp4", MtpConstants.FORMAT_MPEG); addFileType("M4V", FILE_TYPE_M4V, "video/mp4", MtpConstants.FORMAT_MPEG); addFileType("3GP", FILE_TYPE_3GPP, "video/3gpp", MtpConstants.FORMAT_3GP_CONTAINER); addFileType("3GPP", FILE_TYPE_3GPP, "video/3gpp", MtpConstants.FORMAT_3GP_CONTAINER); addFileType("3G2", FILE_TYPE_3GPP2, "video/3gpp2", MtpConstants.FORMAT_3GP_CONTAINER); addFileType("3GPP2", FILE_TYPE_3GPP2, "video/3gpp2", MtpConstants.FORMAT_3GP_CONTAINER); addFileType("MKV", FILE_TYPE_MKV, "video/x-matroska"); addFileType("WEBM", FILE_TYPE_WEBM, "video/webm"); addFileType("TS", FILE_TYPE_MP2TS, "video/mp2ts"); addFileType("AVI", FILE_TYPE_AVI, "video/avi"); if (isWMVEnabled()) { addFileType("WMV", FILE_TYPE_WMV, "video/x-ms-wmv", MtpConstants.FORMAT_WMV); addFileType("ASF", FILE_TYPE_ASF, "video/x-ms-asf"); } addFileType("JPG", FILE_TYPE_JPEG, "image/jpeg", MtpConstants.FORMAT_EXIF_JPEG); addFileType("JPEG", FILE_TYPE_JPEG, "image/jpeg", MtpConstants.FORMAT_EXIF_JPEG); addFileType("GIF", FILE_TYPE_GIF, "image/gif", MtpConstants.FORMAT_GIF); addFileType("PNG", FILE_TYPE_PNG, "image/png", MtpConstants.FORMAT_PNG); addFileType("BMP", FILE_TYPE_BMP, "image/x-ms-bmp", MtpConstants.FORMAT_BMP); addFileType("WBMP", FILE_TYPE_WBMP, "image/vnd.wap.wbmp"); addFileType("WEBP", FILE_TYPE_WEBP, "image/webp"); addFileType("M3U", FILE_TYPE_M3U, "audio/x-mpegurl", MtpConstants.FORMAT_M3U_PLAYLIST); addFileType("M3U", FILE_TYPE_M3U, "application/x-mpegurl", MtpConstants.FORMAT_M3U_PLAYLIST); addFileType("PLS", FILE_TYPE_PLS, "audio/x-scpls", MtpConstants.FORMAT_PLS_PLAYLIST); addFileType("WPL", FILE_TYPE_WPL, "application/vnd.ms-wpl", MtpConstants.FORMAT_WPL_PLAYLIST); addFileType("M3U8", FILE_TYPE_HTTPLIVE, "application/vnd.apple.mpegurl"); addFileType("M3U8", FILE_TYPE_HTTPLIVE, "audio/mpegurl"); addFileType("M3U8", FILE_TYPE_HTTPLIVE, "audio/x-mpegurl"); addFileType("FL", FILE_TYPE_FL, "application/x-android-drm-fl"); addFileType("TXT", FILE_TYPE_TEXT, "text/plain", MtpConstants.FORMAT_TEXT); addFileType("HTM", FILE_TYPE_HTML, "text/html", MtpConstants.FORMAT_HTML); addFileType("HTML", FILE_TYPE_HTML, "text/html", MtpConstants.FORMAT_HTML); addFileType("PDF", FILE_TYPE_PDF, "application/pdf"); addFileType("DOC", FILE_TYPE_MS_WORD, "application/msword", MtpConstants.FORMAT_MS_WORD_DOCUMENT); addFileType("XLS", FILE_TYPE_MS_EXCEL, "application/vnd.ms-excel", MtpConstants.FORMAT_MS_EXCEL_SPREADSHEET); addFileType("PPT", FILE_TYPE_MS_POWERPOINT, "application/mspowerpoint", MtpConstants.FORMAT_MS_POWERPOINT_PRESENTATION); addFileType("FLAC", FILE_TYPE_FLAC, "audio/flac", MtpConstants.FORMAT_FLAC); addFileType("ZIP", FILE_TYPE_ZIP, "application/zip"); addFileType("MPG", FILE_TYPE_MP2PS, "video/mp2p"); addFileType("MPEG", FILE_TYPE_MP2PS, "video/mp2p"); } public static boolean isAudioFileType(int fileType) { return ((fileType >= FIRST_AUDIO_FILE_TYPE && fileType <= LAST_AUDIO_FILE_TYPE) || (fileType >= FIRST_MIDI_FILE_TYPE && fileType <= LAST_MIDI_FILE_TYPE)); } public static boolean isVideoFileType(int fileType) { return (fileType >= FIRST_VIDEO_FILE_TYPE && fileType <= LAST_VIDEO_FILE_TYPE) || (fileType >= FIRST_VIDEO_FILE_TYPE2 && fileType <= LAST_VIDEO_FILE_TYPE2); } public static boolean isImageFileType(int fileType) { return (fileType >= FIRST_IMAGE_FILE_TYPE && fileType <= LAST_IMAGE_FILE_TYPE); } public static boolean isPlayListFileType(int fileType) { return (fileType >= FIRST_PLAYLIST_FILE_TYPE && fileType <= LAST_PLAYLIST_FILE_TYPE); } public static boolean isDrmFileType(int fileType) { return (fileType >= FIRST_DRM_FILE_TYPE && fileType <= LAST_DRM_FILE_TYPE); } public static MediaFileType getFileType(String path) { int lastDot = path.lastIndexOf('.'); if (lastDot < 0) return null; return sFileTypeMap.get(path.substring(lastDot + 1).toUpperCase(Locale.ROOT)); } public static boolean isMimeTypeMedia(String mimeType) { int fileType = getFileTypeForMimeType(mimeType); return isAudioFileType(fileType) || isVideoFileType(fileType) || isImageFileType(fileType) || isPlayListFileType(fileType); } // generates a title based on file name public static String getFileTitle(String path) { // extract file name after last slash int lastSlash = path.lastIndexOf('/'); if (lastSlash >= 0) { lastSlash++; if (lastSlash < path.length()) { path = path.substring(lastSlash); } } // truncate the file extension (if any) int lastDot = path.lastIndexOf('.'); if (lastDot > 0) { path = path.substring(0, lastDot); } return path; } public static int getFileTypeForMimeType(String mimeType) { Integer value = sMimeTypeMap.get(mimeType); return (value == null ? 0 : value.intValue()); } public static String getMimeTypeForFile(String path) { MediaFileType mediaFileType = getFileType(path); return (mediaFileType == null ? null : mediaFileType.mimeType); } public static int getFormatCode(String fileName, String mimeType) { if (mimeType != null) { Integer value = sMimeTypeToFormatMap.get(mimeType); if (value != null) { return value.intValue(); } } int lastDot = fileName.lastIndexOf('.'); if (lastDot > 0) { String extension = fileName.substring(lastDot + 1).toUpperCase(Locale.ROOT); Integer value = sFileTypeToFormatMap.get(extension); if (value != null) { return value.intValue(); } } return MtpConstants.FORMAT_UNDEFINED; } public static String getMimeTypeForFormatCode(int formatCode) { return sFormatToMimeTypeMap.get(formatCode); }}如果我们需要删除一种格式，那么就要直接删除以上的变量还有静态代码块中对应变量的方法：addFileType
例如，我不需要将M4A这种格式添加到我的Android项目中，我可以将以下的：
public static final int FILE_TYPE_M4A = 2;
addFileType("M4A", FILE_TYPE_M4A, "audio/mp4", MtpConstants.FORMAT_MPEG);
删除即可。
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