2 * Sonitus - LameMp3Encoder.java - Copyright © 2013 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.sonitus.data.filter;
20 import java.util.Arrays;
22 import net.pterodactylus.sonitus.data.Metadata;
24 import com.google.common.base.Optional;
25 import com.google.common.collect.ImmutableList;
28 * {@link ExternalMp3Encoder} implementation that uses LAME to encode MP3s.
30 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
32 public class LameMp3Encoder extends ExternalMp3Encoder {
34 /** Preset for LAME. */
37 /** “medium” preset. */
40 /** “standard” preset. */
43 /** “extreme” preset. */
46 /** “insane” preset. */
51 /** The location of the binary. */
52 private final String binary;
54 /** Whether to swap bytes in the input. */
55 private boolean swapBytes;
57 /** The preset to use. */
58 private final Optional<Preset> preset;
60 /** The bitrate to encode to. */
61 private final Optional<Integer> bitrate;
63 /** Whether to use highest quality encoding. */
64 private boolean hq = false;
67 * Creates a new LAME MP3 encoder.
70 * The location of the binary
73 public LameMp3Encoder(String binary, Preset preset) {
74 this(binary, preset, -1);
78 * Creates a new LAME MP3 encoder.
81 * The location of the binary
84 public LameMp3Encoder(String binary, int bitrate) {
85 this(binary, null, bitrate);
89 * Creates a new LAME MP3 encoder.
92 * The location of the binary
97 private LameMp3Encoder(String binary, Preset preset, int bitrate) {
98 super("LAME Encoder");
100 this.preset = Optional.fromNullable(preset);
101 this.bitrate = (bitrate < 0) ? Optional.<Integer>absent() : Optional.<Integer>of(bitrate);
105 * Sets whether to swap bytes on the input to encode
108 * {@code true} to swap the input bytes, {@code false} to use platform
110 * @return This MP3 encoder
112 public LameMp3Encoder swapBytes(boolean swapBytes) {
113 this.swapBytes = swapBytes;
118 * Sets whether to use highest quality encoding.
121 * {@code true} to use highest quality encoding, {@code false} otherwise
122 * @return This MP3 encoder
124 public LameMp3Encoder hq(boolean hq) {
130 // EXTERNALFILTER METHODS
134 protected String binary(Metadata metadata) {
139 protected Iterable<String> parameters(Metadata metadata) {
140 ImmutableList.Builder<String> parameters = ImmutableList.builder();
141 parameters.add("-r");
142 parameters.add("-s").add(String.valueOf(metadata.frequency() / 1000.0));
144 parameters.add("-x");
146 parameters.add("--preset");
147 if (preset.isPresent()) {
148 parameters.add(preset.get().name().toLowerCase());
150 if (bitrate.isPresent()) {
151 if (isSignificant(bitrate.get())) {
152 parameters.add("cbr");
154 parameters.add(String.valueOf(bitrate.get()));
156 parameters.add("-p");
158 parameters.add("-q").add("0");
160 parameters.add("-").add("-");
161 return parameters.build();
169 * Returns whether the given bitrate is one of the significant bitrates of
173 * The bitrate to check (in kbps)
174 * @return {@code true} if the given bitrate is one of the significant MP3
175 * bitrates, {@code false} otherwise
177 private static boolean isSignificant(int bitrate) {
178 return Arrays.asList(80, 96, 112, 128, 160, 192, 224, 256, 320).contains(bitrate);