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authorBjörn Stenberg <bjorn@haxx.se>2007-01-08 23:53:00 +0000
committerBjörn Stenberg <bjorn@haxx.se>2007-01-08 23:53:00 +0000
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Splitting out songdbj
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11953 a1c6a512-1295-4272-9138-f99709370657
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diff --git a/songdbj/com/jcraft/jorbis/DecodeExample.java b/songdbj/com/jcraft/jorbis/DecodeExample.java
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-/* JOrbis
- * Copyright (C) 2000 ymnk, JCraft,Inc.
- *
- * Written by: 2000 ymnk<ymnk@jcraft.com>
- *
- * Many thanks to
- * Monty <monty@xiph.org> and
- * The XIPHOPHORUS Company http://www.xiph.org/ .
- * JOrbis has been based on their awesome works, Vorbis codec.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public License
- * as published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-package com.jcraft.jorbis;
-
-import com.jcraft.jogg.*;
-
-// Takes a vorbis bitstream from stdin and writes raw stereo PCM to
-// stdout. Decodes simple and chained OggVorbis files from beginning
-// to end. Vorbisfile.a is somewhat more complex than the code below.
-
-class DecodeExample{
- static int convsize=4096*2;
- static byte[] convbuffer=new byte[convsize]; // take 8k out of the data segment, not the stack
-
- public static void main(String[] arg){
- java.io.InputStream input=System.in;
- if(arg.length>0){
- try{
- input=new java.io.FileInputStream(arg[0]);
- }
- catch(Exception e){
- System.err.println(e);
- }
- }
-
- SyncState oy=new SyncState(); // sync and verify incoming physical bitstream
- StreamState os=new StreamState(); // take physical pages, weld into a logical stream of packets
- Page og=new Page(); // one Ogg bitstream page. Vorbis packets are inside
- Packet op=new Packet(); // one raw packet of data for decode
-
- Info vi=new Info(); // struct that stores all the static vorbis bitstream settings
- Comment vc=new Comment(); // struct that stores all the bitstream user comments
- DspState vd=new DspState(); // central working state for the packet->PCM decoder
- Block vb=new Block(vd); // local working space for packet->PCM decode
-
- byte[] buffer;
- int bytes=0;
-
- // Decode setup
-
- oy.init(); // Now we can read pages
-
- while(true){ // we repeat if the bitstream is chained
- int eos=0;
-
- // 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
- int index=oy.buffer(4096);
- buffer=oy.data;
- try{
- bytes=input.read(buffer, index, 4096);
- }
- catch(Exception e){
- System.err.println(e);
- System.exit(-1);
- }
- oy.wrote(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.println("Input does not appear to be an Ogg bitstream.");
- 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.serialno());
-
- // 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.println("Error reading first page of Ogg bitstream data.");
- System.exit(1);
- }
-
- if(os.packetout(op)!=1){
- // no page? must not be vorbis
- System.err.println("Error reading initial header packet.");
- System.exit(1);
- }
-
- if(vi.synthesis_headerin(vc,op)<0){
- // error case; not a vorbis header
- System.err.println("This Ogg bitstream does not contain Vorbis audio data.");
- 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. */
-
- int 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==-1){
- // Uh oh; data at some point was corrupted or missing!
- // We can't tolerate that in a header. Die.
- System.err.println("Corrupt secondary header. Exiting.");
- System.exit(1);
- }
- vi.synthesis_headerin(vc,op);
- i++;
- }
- }
- }
- // no harm in not checking before adding more
- index=oy.buffer(4096);
- buffer=oy.data;
- try{
- bytes=input.read(buffer, index, 4096);
- }
- catch(Exception e){
- System.err.println(e);
- System.exit(1);
- }
- if(bytes==0 && i<2){
- System.err.println("End of file before finding all Vorbis headers!");
- System.exit(1);
- }
- oy.wrote(bytes);
- }
-
- // Throw the comments plus a few lines about the bitstream we're
- // decoding
- {
- byte[][] ptr=vc.user_comments;
- for(int j=0; j<ptr.length;j++){
- if(ptr[j]==null) break;
- System.err.println(new String(ptr[j], 0, ptr[j].length-1));
- }
- System.err.println("\nBitstream is "+vi.channels+" channel, "+vi.rate+"Hz");
- System.err.println("Encoded by: "+new String(vc.vendor, 0, vc.vendor.length-1)+"\n");
- }
-
- convsize=4096/vi.channels;
-
- // OK, got and parsed all three headers. Initialize the Vorbis
- // packet->PCM decoder.
- vd.synthesis_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
-
- float[][][] _pcm=new float[1][][];
- int[] _index=new int[vi.channels];
- // The rest is just a straight decode loop until end of stream
- while(eos==0){
- while(eos==0){
-
- int result=oy.pageout(og);
- if(result==0)break; // need more data
- if(result==-1){ // missing or corrupt data at this page position
- System.err.println("Corrupt or missing data in bitstream; continuing...");
- }
- 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==-1){ // missing or corrupt data at this page position
- // no reason to complain; already complained above
- }
- else{
- // we have a packet. Decode it
- int samples;
- if(vb.synthesis(op)==0){ // test for success!
- vd.synthesis_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.synthesis_pcmout(_pcm, _index))>0){
- float[][] pcm=_pcm[0];
- boolean clipflag=false;
- int bout=(samples<convsize?samples:convsize);
-
- // convert floats to 16 bit signed ints (host order) and
- // interleave
- for(i=0;i<vi.channels;i++){
- int ptr=i*2;
- //int ptr=i;
- int mono=_index[i];
- for(int j=0;j<bout;j++){
- int val=(int)(pcm[i][mono+j]*32767.);
-// short val=(short)(pcm[i][mono+j]*32767.);
-// int val=(int)Math.round(pcm[i][mono+j]*32767.);
- // might as well guard against clipping
- if(val>32767){
- val=32767;
- clipflag=true;
- }
- if(val<-32768){
- val=-32768;
- clipflag=true;
- }
- if(val<0) val=val|0x8000;
- convbuffer[ptr]=(byte)(val);
- convbuffer[ptr+1]=(byte)(val>>>8);
- ptr+=2*(vi.channels);
- }
- }
-
- //if(clipflag)
- // System.err.println("Clipping in frame "+vd.sequence);
-
- System.out.write(convbuffer, 0, 2*vi.channels*bout);
-
- vd.synthesis_read(bout); // tell libvorbis how
- // many samples we
- // actually consumed
- }
- }
- }
- if(og.eos()!=0)eos=1;
- }
- }
- if(eos==0){
- index=oy.buffer(4096);
- buffer=oy.data;
- try{
- bytes=input.read(buffer,index,4096);
- }
- catch(Exception e){
- System.err.println(e);
- System.exit(1);
- }
- oy.wrote(bytes);
- if(bytes==0)eos=1;
- }
- }
-
- // 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();
- vi.clear(); // must be called last
- }
-
- // OK, clean up the framer
- oy.clear();
- System.err.println("Done.");
- }
-}
-