/* * VorbisDecoder.java */ import java.io.IOException; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; // import java.util.Random; import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.UnsupportedAudioFileException; import org.tritonus.lowlevel.ogg.Packet; import org.tritonus.lowlevel.ogg.Page; import org.tritonus.lowlevel.ogg.StreamState; import org.tritonus.lowlevel.ogg.SyncState; import org.tritonus.lowlevel.vorbis.Block; import org.tritonus.lowlevel.vorbis.Comment; import org.tritonus.lowlevel.vorbis.DspState; import org.tritonus.lowlevel.vorbis.Info; public class VorbisDecoder { private static int convsize = 4096; public static void main(String[] args) throws IOException { SyncState oy; /* sync and verify incoming physical bitstream */ StreamState os; /* take physical pages, weld into a logical stream of packets */ Page og; /* one Ogg bitstream page. Vorbis packets are inside */ Packet op; /* one raw packet of data for decode */ Info vi; /* struct that stores all the static vorbis bitstream settings */ Comment vc; /* struct that stores all the bitstream user comments */ DspState vd; /* central working state for the packet->PCM decoder */ Block vb; /* local working space for packet->PCM decode */ oy = new SyncState(); os = new StreamState(); og = new Page(); op = new Packet(); vi = new Info(); vc = new Comment(); vd = new DspState(); vb = new Block (); int[] convbuffer = new int[convsize]; byte[] buffer; int bytes; File inputFile = new File(args[0]); File outputFile = new File(args[1]); InputStream inputStream = new FileInputStream(inputFile); OutputStream outputStream = new FileOutputStream(outputFile); buffer = new byte[4096]; /********** Decode setup ************/ oy.init(); /* Now we can read pages */ while (true) { /* we repeat if the bitstream is chained */ boolean eos = false; int i; /* grab some data at the head of the stream. We want the first page (which is guaranteed to be small and only contain the Vorbis stream initial header) We need the first page to get the stream serialno. */ /* submit a 4k block to libvorbis' Ogg layer */ bytes = inputStream.read(buffer); oy.write(buffer, bytes); /* Get the first page. */ if (oy.pageOut(og) != 1) { /* have we simply run out of data? If so, we're done. */ if (bytes < 4096) { break; } /* error case. Must not be Vorbis data */ System.err.print("Input does not appear to be an Ogg bitstream.\n"); System.exit(1); } /* Get the serial number and set up the rest of decode. */ /* serialno first; use it to set up a logical stream */ os.init(og.getSerialNo()); /* extract the initial header from the first page and verify that the Ogg bitstream is in fact Vorbis data */ /* I handle the initial header first instead of just having the code read all three Vorbis headers at once because reading the initial header is an easy way to identify a Vorbis bitstream and it's useful to see that functionality seperated out. */ vi.init(); vc.init(); if (os.pageIn(og) < 0) { /* error; stream version mismatch perhaps */ System.err.print("Error reading first page of Ogg bitstream data.\n"); System.exit(1); } if(os.packetOut(op) != 1) { /* no page? must not be vorbis */ System.err.print("Error reading initial header packet.\n"); System.exit(1); } if(vi.headerIn(vc, op) < 0) { /* error case; not a vorbis header */ System.err.print("This Ogg bitstream does not contain Vorbis audio data.\n"); System.exit(1); } /* At this point, we're sure we're Vorbis. We've set up the logical (Ogg) bitstream decoder. Get the comment and codebook headers and set up the Vorbis decoder */ /* The next two packets in order are the comment and codebook headers. They're likely large and may span multiple pages. Thus we reead and submit data until we get our two pacakets, watching that no pages are missing. If a page is missing, error out; losing a header page is the only place where missing data is fatal. */ i = 0; while (i < 2) { while (i < 2) { int result = oy.pageOut(og); if (result == 0) { break; /* Need more data */ } /* Don't complain about missing or corrupt data yet. We'll catch it at the packet output phase */ if (result == 1) { os.pageIn(og); /* we can ignore any errors here as they'll also become apparent at packetout */ while (i < 2) { result = os.packetOut(op); if (result == 0) { break; } if (result < 0) { /* Uh oh; data at some point was corrupted or missing! We can't tolerate that in a header. Die. */ System.err.print("Corrupt secondary header. Exiting.\n"); System.exit(1); } vi.headerIn(vc, op); i++; } } } /* no harm in not checking before adding more */ bytes = inputStream.read(buffer); if (bytes == 0 && i < 2) { System.err.print("End of file before finding all Vorbis headers!\n"); System.exit(1); } oy.write(buffer, bytes); } /* Throw the comments plus a few lines about the bitstream we're decoding */ { String[] astrComments = vc.getUserComments(); for (i = 0; i < astrComments.length; i++) { System.err.println(astrComments[i]); } System.err.print("\nBitstream is " + vi.getChannels() + " channel, " + vi.getRate() + " Hz\n"); System.err.print("Encoded by: " + vc.getVendor() + "\n\n"); } int nChannels = vi.getChannels(); convsize = 4096 / nChannels; /* OK, got and parsed all three headers. Initialize the Vorbis packet->PCM decoder. */ vd.init(vi); /* central decode state */ vb.init(vd); /* local state for most of the decode so multiple block decodes can proceed in parallel. We could init multiple vorbis_block structures for vd here */ /* The rest is just a straight decode loop until end of stream */ while (!eos) { while (!eos) { int result = oy.pageOut(og); if (result == 0) { break; /* need more data */ } if (result < 0) { /* missing or corrupt data at this page position */ System.err.print("Corrupt or missing data in bitstream; continuing...\n"); } else { os.pageIn(og); /* can safely ignore errors at this point */ while (true) { result = os.packetOut(op); if (result == 0) { break; /* need more data */ } if (result < 0) { /* missing or corrupt data at this page position */ /* no reason to complain; already complained above */ } else { /* we have a packet. Decode it */ float[][] pcm = new float[nChannels][0]; int samples; if (vb.synthesis(op) == 0) /* test for success! */ { vd.blockIn(vb); } /* **pcm is a multichannel float vector. In stereo, for example, pcm[0] is left, and pcm[1] is right. samples is the size of each channel. Convert the float values (-1.<=range<=1.) to whatever PCM format and write it out */ while ((samples = vd.pcmOut(pcm)) > 0) { int j; boolean clipflag = false; int bout = (samples < convsize ? samples : convsize); /* convert floats to 16 bit signed ints (host order) and interleave */ for(i = 0; i < nChannels; i++) { int ptr = i; // float *mono=pcm[i]; for(j = 0; j < bout; j++) { int val = Math.round(pcm[i][j] * 32767.0F); /* might as well guard against clipping */ if (val > 32767) { val = 32767; clipflag = true; } if(val<-32768) { val = -32768; clipflag = true; } convbuffer[ptr] = val; ptr += nChannels; } } if (clipflag) { System.err.print("Clipping in frame " + vd.getSequence() + "\n"); } byte[] abBuffer = new byte[2 * nChannels * bout]; int byteOffset = 0; boolean bigEndian = false; for (int nSample = 0; nSample < nChannels * bout; nSample++) { int sample = convbuffer[nSample]; if (bigEndian) { abBuffer[byteOffset++]=(byte) (sample >> 8); abBuffer[byteOffset++]=(byte) (sample & 0xFF); } else { abBuffer[byteOffset++]=(byte) (sample & 0xFF); abBuffer[byteOffset++]=(byte) (sample >> 8); } } outputStream.write(abBuffer); vd.read(bout); /* tell libvorbis how many samples we actually consumed */ } } } if (og.isEos()) { eos = true; } } } if (!eos) { bytes = inputStream.read(buffer); oy.write(buffer, bytes); if (bytes == 0) { eos = true; } } } /* clean up this logical bitstream; before exit we see if we're followed by another [chained] */ os.clear(); /* ogg_page and ogg_packet structs always point to storage in libvorbis. They're never freed or manipulated directly */ vb.clear(); vd.clear(); vc.clear(); vi.clear(); /* must be called last */ } /* OK, clean up the framer */ oy.clear(); System.err.print("Done.\n"); System.exit(0); } } /*** VorbisDecoder.java ***/