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AntennaPod
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Added support for opus files

This commit is contained in:
ByteHamster 2020-02-13 01:07:31 +01:00
parent 246a2e650c
commit d0cc035950
1 changed files with 33 additions and 42 deletions
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75
core/src/main/java/de/danoeh/antennapod/core/util/vorbiscommentreader/VorbisCommentReader.java
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@ -9,11 +9,11 @@ import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.Arrays;
public abstract class VorbisCommentReader {
/** Length of first page in an ogg file in bytes. */
private static final int FIRST_PAGE_LENGTH = 58;
private static final int FIRST_OGG_PAGE_LENGTH = 58;
private static final int FIRST_OPUS_PAGE_LENGTH = 47;
private static final int SECOND_PAGE_MAX_LENGTH = 64 * 1024 * 1024;
private static final int PACKET_TYPE_IDENTIFICATION = 1;
private static final int PACKET_TYPE_COMMENT = 3;
@ -93,13 +93,14 @@ public abstract class VorbisCommentReader {
* method will return true, otherwise false.
*/
private boolean findIdentificationHeader(InputStream input) throws IOException {
byte[] buffer = new byte[FIRST_PAGE_LENGTH];
byte[] buffer = new byte[FIRST_OPUS_PAGE_LENGTH];
IOUtils.readFully(input, buffer);
final byte[] oggIdentificationHeader = new byte[]{ PACKET_TYPE_IDENTIFICATION, 'v', 'o', 'r', 'b', 'i', 's' };
for (int i = 6; i < buffer.length; i++) {
if (buffer[i - 5] == 'v' && buffer[i - 4] == 'o'
&& buffer[i - 3] == 'r' && buffer[i - 2] == 'b'
&& buffer[i - 1] == 'i' && buffer[i] == 's'
&& buffer[i - 6] == PACKET_TYPE_IDENTIFICATION) {
if (bufferMatches(buffer, oggIdentificationHeader, i)) {
IOUtils.skip(input, FIRST_OGG_PAGE_LENGTH - FIRST_OPUS_PAGE_LENGTH);
return true;
} else if (bufferMatches(buffer, "OpusHead".getBytes(), i)) {
return true;
}
}
@ -107,47 +108,37 @@ public abstract class VorbisCommentReader {
}
private boolean findCommentHeader(InputStream input) throws IOException {
char[] buffer = new char["vorbis".length() + 1];
byte[] buffer = new byte[64]; // Enough space for some bytes. Used circularly.
final byte[] oggCommentHeader = new byte[]{ PACKET_TYPE_COMMENT, 'v', 'o', 'r', 'b', 'i', 's' };
for (int bytesRead = 0; bytesRead < SECOND_PAGE_MAX_LENGTH; bytesRead++) {
char c = (char) input.read();
int dest = -1;
switch (c) {
case PACKET_TYPE_COMMENT:
dest = 0;
break;
case 'v':
dest = 1;
break;
case 'o':
dest = 2;
break;
case 'r':
dest = 3;
break;
case 'b':
dest = 4;
break;
case 'i':
dest = 5;
break;
case 's':
dest = 6;
break;
}
if (dest >= 0) {
buffer[dest] = c;
if (buffer[1] == 'v' && buffer[2] == 'o' && buffer[3] == 'r'
&& buffer[4] == 'b' && buffer[5] == 'i'
&& buffer[6] == 's' && buffer[0] == PACKET_TYPE_COMMENT) {
return true;
}
} else {
Arrays.fill(buffer, (char) 0);
buffer[bytesRead % buffer.length] = (byte) input.read();
if (bufferMatches(buffer, oggCommentHeader, bytesRead)) {
return true;
} else if (bufferMatches(buffer, "OpusTags".getBytes(), bytesRead)) {
return true;
}
}
return false;
}
/**
* Reads backwards in haystack, starting at position. Checks if the bytes match needle.
* Uses haystack circularly, so when reading at (-1), it reads at (length - 1).
*/
boolean bufferMatches(byte[] haystack, byte[] needle, int position) {
for (int i = 0; i < needle.length; i++) {
int posInHaystack = position - i;
while (posInHaystack < 0) {
posInHaystack += haystack.length;
}
posInHaystack = posInHaystack % haystack.length;
if (haystack[posInHaystack] != needle[needle.length - 1 - i]) {
return false;
}
}
return true;
}
@NonNull
private VorbisCommentHeader readCommentHeader(InputStream input) throws IOException, VorbisCommentReaderException {
try {