Add method that tries to automatically detect the audio codec from the filename.

[demoscenemusic.git] / src / main / java / net / pterodactylus / demoscenemusic / utils / AudioCodecs.java

diff --git a/src/main/java/net/pterodactylus/demoscenemusic/utils/AudioCodecs.java b/src/main/java/net/pterodactylus/demoscenemusic/utils/AudioCodecs.java
index a3c90c3..4ec19e8 100644 (file)
--- a/src/main/java/net/pterodactylus/demoscenemusic/utils/AudioCodecs.java
+++ b/src/main/java/net/pterodactylus/demoscenemusic/utils/AudioCodecs.java
@@ -31,13 +31,42 @@ public class AudioCodecs {
        public static final Map<String, AudioCodecDescription> codecDescriptions = new HashMap<String, AudioCodecDescription>();
 
        static {
-               codecDescriptions.put("mp3", new AudioCodecDescription("MPEG 1 Layer 3", "MP3", "audio/mpeg", true, false));
-               codecDescriptions.put("vorbis", new AudioCodecDescription("Ogg Vorbis", "Vorbis", "audio/vorbis", true, false));
-               codecDescriptions.put("aac", new AudioCodecDescription("Advanced Audio Coding", "AAC", "audio/x-aac", true, false));
-               codecDescriptions.put("flac", new AudioCodecDescription("Free Lossless Audio Codec", "FLAC", "audio/ogg", true, true));
-               codecDescriptions.put("WAV", new AudioCodecDescription("Waveform Audio", "WAV", "audio/vnc.wave", true, true));
-               codecDescriptions.put("mod", new AudioCodecDescription("Module", "MOD", "audio/mod", false, true));
-               codecDescriptions.put("ft2", new AudioCodecDescription("FastTracker II Module", "XM", "audio/xm", false, true));
+               codecDescriptions.put("mp3", new AudioCodecDescription("mp3", "MPEG 1 Layer 3", "MP3", "audio/mpeg", true, false));
+               codecDescriptions.put("vorbis", new AudioCodecDescription("vorbis", "Ogg Vorbis", "Vorbis", "audio/vorbis", true, false));
+               codecDescriptions.put("aac", new AudioCodecDescription("aac", "Advanced Audio Coding", "AAC", "audio/x-aac", true, false));
+               codecDescriptions.put("flac", new AudioCodecDescription("flac", "Free Lossless Audio Codec", "FLAC", "audio/ogg", true, true));
+               codecDescriptions.put("wav", new AudioCodecDescription("wav", "Waveform Audio", "WAV", "audio/vnc.wave", true, true));
+               codecDescriptions.put("mod", new AudioCodecDescription("mod", "Module", "MOD", "audio/mod", false, true));
+               codecDescriptions.put("ft2", new AudioCodecDescription("ft2", "FastTracker II Module", "XM", "audio/xm", false, true));
+       }
+
+       /**
+        * Tries to automatically detect the audio codec from the filename. In most
+        * cases this will match the {@link AudioCodecDescription#code} of the codec
+        * but in some cases other extensions are possible, too. Also, on Amiga
+        * filenames usually start with the extension (mod files are often named
+        * “mod.somethingsomethingsomethingdarkside”).
+        *
+        * @param filename
+        *            The name of the file
+        * @return The audio codec of the file, or {@code null} if no codec could be
+        *         detected
+        */
+       public static AudioCodecDescription detect(String filename) {
+               String extension = filename.substring(filename.lastIndexOf('.') + 1).toLowerCase();
+               if (codecDescriptions.containsKey(extension)) {
+                       return codecDescriptions.get(extension);
+               }
+               if (extension.equals("ogg")) {
+                       return codecDescriptions.get("vorbis");
+               }
+               if (extension.equals("mp4")) {
+                       return codecDescriptions.get("aac");
+               }
+               if (extension.equals("xm")) {
+                       return codecDescriptions.get("ft2");
+               }
+               return null;
        }
 
        /**
@@ -49,6 +78,9 @@ public class AudioCodecs {
         */
        public final static class AudioCodecDescription {
 
+               /** The code of this codec. */
+               public final String code;
+
                /** The full name of the codec. */
                public final String name;
 
@@ -67,6 +99,8 @@ public class AudioCodecs {
                /**
                 * Creates a new audio codec description.
                 *
+                * @param code
+                *            The code of the codec
                 * @param name
                 *            The full name of the codec
                 * @param shortName
@@ -80,7 +114,8 @@ public class AudioCodecs {
                 *            {@code true} if the codec is a lossless audio codec,
                 *            {@code false} otherwise
                 */
-               AudioCodecDescription(String name, String shortName, String mimeType, boolean streaming, boolean lossless) {
+               AudioCodecDescription(String code, String name, String shortName, String mimeType, boolean streaming, boolean lossless) {
+                       this.code = code;
                        this.name = name;
                        this.shortName = shortName;
                        this.mimeType = mimeType;