--- /dev/null
+/*
+ * Sonitus - Frame.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sonitus.io.mp3;
+
+import java.util.Map;
+
+import com.google.common.base.Optional;
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.google.common.collect.ImmutableBiMap;
+import com.google.common.collect.ImmutableMap;
+
+/**
+ * A single MPEG audio frame.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class Frame {
+
+ /** The MPEG audio version. */
+ public enum MpegAudioVersion {
+
+ /** Verstion 2.5. */
+ VERSION_2_5,
+
+ /** Reserved. */
+ RESERVED,
+
+ /** Version 2. */
+ VERSION_2,
+
+ /** Version 1. */
+ VERSION_1
+
+ }
+
+ /** The MPEG layer description. */
+ public enum LayerDescription {
+
+ /** Reserved. */
+ RESERVED,
+
+ /** Layer III. */
+ LAYER_3,
+
+ /** Layer II. */
+ LAYER_2,
+
+ /** Layer I. */
+ LAYER_1
+
+ }
+
+ /** The channel mode. */
+ public enum ChannelMode {
+
+ /* Stereo. */
+ STEREO,
+
+ /** Joint stereo. */
+ JOINT_STEREO,
+
+ /** Dual-channel stereo. */
+ DUAL_CHANNEL,
+
+ /** Single channel, aka mono. */
+ SINGLE_CHANNEL
+
+ }
+
+ /** Mode of emphasis. */
+ public enum Emphasis {
+
+ /** No emphasis. */
+ NONE,
+
+ /** 50/15 ms. */
+ _50_15_MS,
+
+ /** Reserved. */
+ RESERVED,
+
+ /** CCIT J.17. */
+ CCIT_J_17
+
+ }
+
+ /** Bitrate table. */
+ private static final Supplier<Map<MpegAudioVersion, Map<LayerDescription, Map<Integer, Integer>>>> bitrateSupplier = Suppliers.memoize(new Supplier<Map<MpegAudioVersion, Map<LayerDescription, Map<Integer, Integer>>>>() {
+
+ @Override
+ public Map<MpegAudioVersion, Map<LayerDescription, Map<Integer, Integer>>> get() {
+ ImmutableMap.Builder<MpegAudioVersion, Map<LayerDescription, Map<Integer, Integer>>> mpegAudioVersionMapBuilder = ImmutableMap.builder();
+
+ /* MPEG 1. */
+ ImmutableMap.Builder<LayerDescription, Map<Integer, Integer>> mpeg1Builder = ImmutableMap.builder();
+
+ /* Layer 1. */
+ ImmutableMap.Builder<Integer, Integer> bitrates = ImmutableMap.builder();
+ bitrates.put(0, 0).put(1, 32).put(2, 64).put(3, 96).put(4, 128).put(5, 160).put(6, 192).put(7, 224);
+ bitrates.put(8, 256).put(9, 288).put(10, 320).put(11, 352).put(12, 384).put(13, 416).put(14, 448).put(15, -1);
+ mpeg1Builder.put(LayerDescription.LAYER_1, bitrates.build());
+
+ /* MPEG 1, Layer 2 bitrates. */
+ bitrates = ImmutableMap.builder();
+ bitrates.put(0, 0).put(1, 32).put(2, 48).put(3, 56).put(4, 64).put(5, 80).put(6, 96).put(7, 112);
+ bitrates.put(8, 128).put(9, 160).put(10, 192).put(11, 224).put(12, 256).put(13, 320).put(14, 384).put(15, -1);
+ mpeg1Builder.put(LayerDescription.LAYER_2, bitrates.build());
+
+ /* MPEG 1, Layer 3 bitrates. */
+ bitrates = ImmutableMap.builder();
+ bitrates.put(0, 0).put(1, 32).put(2, 40).put(3, 48).put(4, 56).put(5, 64).put(6, 80).put(7, 96);
+ bitrates.put(8, 112).put(9, 128).put(10, 160).put(11, 192).put(12, 224).put(13, 256).put(14, 320).put(15, -1);
+ mpeg1Builder.put(LayerDescription.LAYER_3, bitrates.build());
+ mpegAudioVersionMapBuilder.put(MpegAudioVersion.VERSION_1, mpeg1Builder.build());
+
+ /* MPEG 2 & 2.5. */
+ ImmutableBiMap.Builder<LayerDescription, Map<Integer, Integer>> mpeg2Builder = ImmutableBiMap.builder();
+
+ /* Layer 1. */
+ bitrates = ImmutableMap.builder();
+ bitrates.put(0, 0).put(1, 32).put(2, 48).put(3, 56).put(4, 64).put(5, 80).put(6, 96).put(7, 112);
+ bitrates.put(8, 128).put(9, 144).put(10, 160).put(11, 176).put(12, 192).put(13, 224).put(14, 256).put(15, -1);
+ mpeg2Builder.put(LayerDescription.LAYER_1, bitrates.build());
+
+ /* Layer 2 & 3. */
+ bitrates = ImmutableMap.builder();
+ bitrates.put(0, 0).put(1, 8).put(2, 16).put(3, 24).put(4, 32).put(5, 40).put(6, 48).put(7, 56);
+ bitrates.put(8, 64).put(9, 80).put(10, 96).put(11, 112).put(12, 128).put(13, 144).put(14, 160).put(15, -1);
+ mpeg2Builder.put(LayerDescription.LAYER_2, bitrates.build());
+ mpeg2Builder.put(LayerDescription.LAYER_3, bitrates.build());
+
+ mpegAudioVersionMapBuilder.put(MpegAudioVersion.VERSION_2, mpeg2Builder.build());
+ mpegAudioVersionMapBuilder.put(MpegAudioVersion.VERSION_2_5, mpeg2Builder.build());
+
+ return mpegAudioVersionMapBuilder.build();
+ }
+ });
+
+ /** Sampling rate table. */
+ private static final Supplier<Map<MpegAudioVersion, Map<Integer, Integer>>> samplingRateSupplier = Suppliers.memoize(new Supplier<Map<MpegAudioVersion, Map<Integer, Integer>>>() {
+
+ @Override
+ public Map<MpegAudioVersion, Map<Integer, Integer>> get() {
+ ImmutableMap.Builder<MpegAudioVersion, Map<Integer, Integer>> mpegAudioVersions = ImmutableMap.builder();
+
+ /* MPEG 1. */
+ ImmutableMap.Builder<Integer, Integer> samplingRates = ImmutableMap.builder();
+ samplingRates.put(0, 44100).put(1, 48000).put(2, 32000).put(3, 0);
+ mpegAudioVersions.put(MpegAudioVersion.VERSION_1, samplingRates.build());
+
+ /* MPEG 2. */
+ samplingRates = ImmutableMap.builder();
+ samplingRates.put(0, 22050).put(1, 24000).put(2, 16000).put(3, 0);
+ mpegAudioVersions.put(MpegAudioVersion.VERSION_2, samplingRates.build());
+
+ /* MPEG 2.5. */
+ samplingRates = ImmutableMap.builder();
+ samplingRates.put(0, 11025).put(1, 12000).put(2, 8000).put(3, 0);
+ mpegAudioVersions.put(MpegAudioVersion.VERSION_2_5, samplingRates.build());
+
+ return mpegAudioVersions.build();
+ }
+ });
+
+ /** The decoded MPEG audio version ID. */
+ private final int mpegAudioVersionId;
+
+ /** The decoded layer description. */
+ private final int layerDescription;
+
+ /** The decoded protection bit. */
+ private final int protectionBit;
+
+ /** The decoded bitrate index. */
+ private final int bitrateIndex;
+
+ /** The deocded sampling rate frequency index. */
+ private final int samplingRateFrequencyIndex;
+
+ /** The decoded padding bit. */
+ private final int paddingBit;
+
+ /** The decoded private bit. */
+ private final int privateBit;
+
+ /** The decoded channel mode. */
+ private final int channelMode;
+
+ /** The deocded mode extension. */
+ private final int modeExtension;
+
+ /** The decoded copyright bit. */
+ private final int copyright;
+
+ /** The deocded original bit. */
+ private final int original;
+
+ /** The decoded emphasis mode. */
+ private final int emphasis;
+
+ private Frame(int mpegAudioVersionId, int layerDescription, int protectionBit, int bitrateIndex, int samplingRateFrequencyIndex, int paddingBit, int privateBit, int channelMode, int modeExtension, int copyright, int original, int emphasis) {
+ this.mpegAudioVersionId = mpegAudioVersionId;
+ this.layerDescription = layerDescription;
+ this.protectionBit = protectionBit;
+ this.bitrateIndex = bitrateIndex;
+ this.samplingRateFrequencyIndex = samplingRateFrequencyIndex;
+ this.paddingBit = paddingBit;
+ this.privateBit = privateBit;
+ this.channelMode = channelMode;
+ this.modeExtension = modeExtension;
+ this.copyright = copyright;
+ this.original = original;
+ this.emphasis = emphasis;
+ }
+
+ //
+ // ACCESSORS
+ //
+
+ public MpegAudioVersion mpegAudioVersion() {
+ return MpegAudioVersion.values()[mpegAudioVersionId];
+ }
+
+ public LayerDescription layerDescription() {
+ return LayerDescription.values()[layerDescription];
+ }
+
+ public boolean protectionBit() {
+ return protectionBit != 0;
+ }
+
+ public int bitrate() {
+ return bitrateSupplier.get().get(mpegAudioVersion()).get(layerDescription()).get(bitrateIndex);
+ }
+
+ public int samplingRate() {
+ return samplingRateSupplier.get().get(mpegAudioVersion()).get(samplingRateFrequencyIndex);
+ }
+
+ public boolean paddingBit() {
+ return paddingBit != 0;
+ }
+
+ public boolean privateBit() {
+ return privateBit != 0;
+ }
+
+ public ChannelMode channelMode() {
+ return ChannelMode.values()[channelMode];
+ }
+
+ /* TODO - mode extension. */
+
+ public boolean copyrightBit() {
+ return copyright != 0;
+ }
+
+ public boolean originalBit() {
+ return original != 0;
+ }
+
+ public Emphasis emphasis() {
+ return Emphasis.values()[emphasis];
+ }
+
+ //
+ // STATIC METHODS
+ //
+
+ public static boolean isFrame(byte[] buffer, int offset, int length) {
+ return (((buffer[offset] & 0xff) == 0xff) && ((buffer[offset + 1] & 0xe0) == 0xe0));
+ }
+
+ public static Optional<Frame> create(byte[] buffer, int offset, int length) {
+ if (isFrame(buffer, offset, length)) {
+ int mpegAudioVersionId = (buffer[offset + 1] & 0x18) >>> 3;
+ int layerDescription = (buffer[offset + 1] & 0x06) >>> 1;
+ int protectionBit = buffer[offset + 1] & 0x01;
+ int bitrateIndex = (buffer[offset + 2] & 0xf0) >>> 4;
+ int samplingRateFrequencyIndex = (buffer[offset + 2] & 0x0c) >>> 2;
+ int paddingBit = (buffer[offset + 2] & 0x02) >>> 1;
+ int privateBit = buffer[offset + 2] & 0x01;
+ int channelMode = (buffer[offset + 3] & 0xc0) >> 6;
+ int modeExtension = (buffer[offset + 3] & 0x60) >> 4;
+ int copyright = (buffer[offset + 3] & 0x08) >> 3;
+ int original = (buffer[offset + 3] & 0x04) >> 2;
+ int emphasis = buffer[offset + 3] & 0x03;
+ return Optional.of(new Frame(mpegAudioVersionId, layerDescription, protectionBit, bitrateIndex, samplingRateFrequencyIndex, paddingBit, privateBit, channelMode, modeExtension, copyright, original, emphasis));
+ }
+ return Optional.absent();
+ }
+
+}
--- /dev/null
+/*
+ * Sonitus - Mp3Parser.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sonitus.io.mp3;
+
+import java.io.EOFException;
+import java.io.IOException;
+import java.io.InputStream;
+
+import com.google.common.base.Optional;
+import com.google.common.io.ByteStreams;
+
+/**
+ * A parser for MP3 files. It can recognize (and skip) ID3v2 header tags and
+ * MPEG audio frames.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class Parser {
+
+ /** The input stream to parse. */
+ private final InputStream inputStream;
+
+ /** The complete ID3v2 tag. */
+ private final byte[] id3Tag;
+
+ /** The current read buffer. */
+ private final byte[] buffer = new byte[4];
+
+ /**
+ * Creates a new parser.
+ *
+ * @param inputStream
+ * The input stream to parse
+ * @throws IOException
+ * if an I/O error occurs
+ */
+ public Parser(InputStream inputStream) throws IOException {
+ this.inputStream = inputStream;
+ readFully(inputStream, buffer, 0, 3);
+ if ((buffer[0] == 'I') && (buffer[1] == 'D') && (buffer[2] == '3')) {
+ readFully(inputStream, buffer, 0, 3);
+ byte[] lengthBuffer = new byte[4];
+ readFully(inputStream, lengthBuffer, 0, 4);
+ int headerLength = (lengthBuffer[0] << 21) | (lengthBuffer[1] << 14) | (lengthBuffer[2] << 7) | lengthBuffer[3];
+ id3Tag = new byte[headerLength + 10];
+ System.arraycopy(new byte[] { 'I', 'D', '3', buffer[0], buffer[1], buffer[2], lengthBuffer[0], lengthBuffer[1], lengthBuffer[2], lengthBuffer[3] }, 0, id3Tag, 0, 10);
+ readFully(inputStream, id3Tag, 10, headerLength);
+ readFully(inputStream, buffer, 0, 3);
+ } else {
+ id3Tag = null;
+ }
+ }
+
+ /**
+ * Returns the ID3v2 tag.
+ *
+ * @return The ID3v2 tag, or {@link Optional#absent()} if there is no ID3v2
+ * tag
+ */
+ public Optional<byte[]> getId3Tag() {
+ return Optional.fromNullable(id3Tag);
+ }
+
+ /**
+ * Returns the next frame.
+ *
+ * @return The next frame
+ * @throws IOException
+ * if an I/O error occurs, or EOF is reached
+ */
+ public Frame nextFrame() throws IOException {
+ while (true) {
+ int r = inputStream.read();
+ if (r == -1) {
+ throw new EOFException();
+ }
+ System.arraycopy(buffer, 1, buffer, 0, 3);
+ buffer[3] = (byte) r;
+ Optional<Frame> frame = Frame.create(buffer, 0, 4);
+ if (frame.isPresent()) {
+ return frame.get();
+ }
+ }
+ }
+
+ //
+ // STATIC METHODS
+ //
+
+ /**
+ * Reads exactly {@code length} bytes from the given input stream, throwing an
+ * {@link EOFException} if there are not enough bytes left in the stream.
+ *
+ * @param inputStream
+ * The input stream to read from
+ * @param buffer
+ * The buffer in which to read
+ * @param offset
+ * The offset at which to start writing into the buffer
+ * @param length
+ * The amount of bytes to read
+ * @throws IOException
+ * if an I/O error occurs, or EOF is reached
+ */
+ private static void readFully(InputStream inputStream, byte[] buffer, int offset, int length) throws IOException {
+ if (ByteStreams.read(inputStream, buffer, offset, length) < length) {
+ throw new EOFException();
+ }
+ }
+
+}
projects / sonitus.git / commitdiff