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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| package freenet.client.filter; | ||
|
|
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| import java.io.DataInputStream; | ||
| import java.io.DataOutputStream; | ||
| import java.io.IOException; | ||
| import java.util.Map; | ||
|
|
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| import freenet.client.filter.WebPFilter.WebPFilterContext; | ||
| import freenet.l10n.NodeL10n; | ||
| import freenet.support.Logger; | ||
| import freenet.support.Logger.LogLevel; | ||
|
|
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| public class WAVFilter extends RIFFFilter { | ||
| // RFC 2361 | ||
| private final int WAVE_FORMAT_UNKNOWN = 0; | ||
| private final int WAVE_FORMAT_PCM = 1; | ||
| private final int WAVE_FORMAT_IEEE_FLOAT = 3; | ||
| private final int WAVE_FORMAT_ALAW = 6; | ||
| private final int WAVE_FORMAT_MULAW = 7; | ||
|
|
||
| @Override | ||
| protected byte[] getChunkMagicNumber() { | ||
| return new byte[] {'W', 'A', 'V', 'E'}; | ||
| } | ||
|
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| class WAVFilterContext { | ||
| public boolean hasfmt = false; | ||
| public boolean hasdata = false; | ||
| public int nSamplesPerSec = 0; | ||
| public int nChannels = 0; | ||
| public int nBlockAlign = 0; | ||
| public int wBitsPerSample = 0; | ||
| public int format = 0; | ||
| } | ||
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|
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| @Override | ||
| protected Object createContext() { | ||
| return new WAVFilterContext(); | ||
| } | ||
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| @Override | ||
| protected void readFilterChunk(byte[] ID, int size, Object context, DataInputStream input, DataOutputStream output, | ||
| String charset, Map<String, String> otherParams, String schemeHostAndPort, FilterCallback cb) | ||
| throws DataFilterException, IOException { | ||
| WAVFilterContext ctx = (WAVFilterContext)context; | ||
| if(ID[0] == 'f' && ID[1] == 'm' && ID[2] == 't' && ID[3] == ' ') { | ||
| if(ctx.hasfmt) { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "Unexpected fmt chunk was encountered"); | ||
| } | ||
| if(size != 16 && size != 18 && size != 40) { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "fmt chunk size is invalid"); | ||
| } | ||
| ctx.format = Short.reverseBytes(input.readShort()); | ||
| if(ctx.format != WAVE_FORMAT_PCM && ctx.format != WAVE_FORMAT_IEEE_FLOAT && ctx.format != WAVE_FORMAT_ALAW && ctx.format != WAVE_FORMAT_MULAW) { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "WAV file uses a not yet supported format"); | ||
| } | ||
| ctx.nChannels = Short.reverseBytes(input.readShort()); | ||
| output.write(ID); | ||
| writeLittleEndianInt(output, size); | ||
| output.writeInt((Short.reverseBytes((short) ctx.format) << 16) | Short.reverseBytes((short) ctx.nChannels)); | ||
| ctx.nSamplesPerSec = readLittleEndianInt(input); | ||
| writeLittleEndianInt(output, ctx.nSamplesPerSec); | ||
| int nAvgBytesPerSec = readLittleEndianInt(input); | ||
| writeLittleEndianInt(output, nAvgBytesPerSec); | ||
| ctx.nBlockAlign = Short.reverseBytes(input.readShort()); | ||
| ctx.wBitsPerSample = Short.reverseBytes(input.readShort()); | ||
| output.writeInt((Short.reverseBytes((short) ctx.nBlockAlign) << 16) | Short.reverseBytes((short) ctx.wBitsPerSample)); | ||
| ctx.hasfmt = true; | ||
| if(size > 16) { | ||
| short cbSize = Short.reverseBytes(input.readShort()); | ||
| if(cbSize + 18 != size) { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "fmt chunk size is invalid"); | ||
| } | ||
| output.writeShort(Short.reverseBytes(cbSize)); | ||
| } | ||
| if(size > 18) { | ||
| // wValidBitsPerSample, dwChannelMask, and SubFormat GUID | ||
| passthroughBytes(input, output, 22); | ||
| } | ||
| // Further checks | ||
| if((ctx.format == WAVE_FORMAT_ALAW || ctx.format == WAVE_FORMAT_MULAW) && ctx.wBitsPerSample != 8) { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "Unexpected bits per sample value"); | ||
| } | ||
| return; | ||
| } else if(!ctx.hasfmt) { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "Unexpected header chunk was encountered, instead of fmt chunk"); | ||
| } | ||
| if(ID[0] == 'd' && ID[1] == 'a' && ID[2] == 't' && ID[3] == 'a') { | ||
| if(ctx.format == WAVE_FORMAT_PCM || ctx.format == WAVE_FORMAT_IEEE_FLOAT || ctx.format == WAVE_FORMAT_ALAW || ctx.format == WAVE_FORMAT_MULAW) { | ||
| // Safe format, pass through | ||
| output.write(ID); | ||
| writeLittleEndianInt(output, size); | ||
| passthroughBytes(input, output, size); | ||
| if((size & 1) != 0) // Add padding if necessary | ||
| output.writeByte(input.readByte()); | ||
| ctx.hasdata = true; | ||
| } else { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "Data format is not yet supported"); | ||
| } | ||
| } else if(ID[0] == 'f' && ID[1] == 'a' && ID[2] == 'c' && ID[3] == 't') { | ||
| if(size < 4) { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "fact chunk must contain at least 4 bytes"); | ||
| } | ||
| // Just dwSampleLength (Number of samples) here, pass through | ||
| output.write(ID); | ||
| writeLittleEndianInt(output, size); | ||
| passthroughBytes(input, output, size); | ||
| if((size & 1) != 0) // Add padding if necessary | ||
| output.writeByte(input.readByte()); | ||
| } else { | ||
| // Unknown block | ||
| writeJunkChunk(input, output, size); | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| protected void EOFCheck(Object context) throws DataFilterException { | ||
| WAVFilterContext ctx = (WAVFilterContext)context; | ||
| if(!ctx.hasfmt || !ctx.hasdata) { | ||
| throw new DataFilterException(l10n("invalidTitle"), l10n("invalidTitle"), "WAV file is missing fmt chunk or data chunk"); | ||
| } | ||
| } | ||
|
|
||
| private static String l10n(String key) { | ||
| return NodeL10n.getBase().getString("WAVFilter."+key); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package freenet.client.filter; | ||
|
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| import static freenet.client.filter.ResourceFileUtil.resourceToBucket; | ||
| import static org.junit.Assert.*; | ||
|
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| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.OutputStream; | ||
| import java.util.HashMap; | ||
|
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| import org.junit.Test; | ||
|
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| import freenet.support.api.Bucket; | ||
| import freenet.support.io.ArrayBucket; | ||
| import freenet.support.io.BucketTools; | ||
|
|
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| /** | ||
| * Unit test for (parts of) {@link WAVFilter}. | ||
| */ | ||
| public class WAVFilterTest { | ||
|
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| @Test | ||
| public void testValidWAV() throws IOException { | ||
| Bucket input = resourceToBucket("./wav/test.wav"); | ||
| Bucket output = filterWAV(input); | ||
|
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| //Filter should return the original | ||
| assertEquals("Input and output should be the same length", input.size(), output.size()); | ||
| assertArrayEquals("Input and output are not identical", BucketTools.toByteArray(input), BucketTools.toByteArray(output)); | ||
| } | ||
|
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| private Bucket filterWAV(Bucket input) throws IOException { | ||
| WAVFilter objWAVFilter = new WAVFilter(); | ||
| Bucket output = new ArrayBucket(); | ||
| try ( | ||
| InputStream inStream = input.getInputStream(); | ||
| OutputStream outStream = output.getOutputStream() | ||
| ) { | ||
| objWAVFilter.readFilter(inStream, outStream, "", null, null, null); | ||
| } | ||
| return output; | ||
| } | ||
| } |
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