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package cn.org.hentai.jtt1078.codec.g726;
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import cn.org.hentai.jtt1078.codec.G711Codec;
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import cn.org.hentai.jtt1078.codec.G711UCodec;
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/** G726_32 encoder and decoder.
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* <p>
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* These routines comprise an implementation of the CCITT G.726 32kbps ADPCM
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* coding algorithm. Essentially, this implementation is identical to
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* the bit level description except for a few deviations which
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* take advantage of work station attributes, such as hardware 2's
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* complement arithmetic and large memory. Specifically, certain time
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* consuming operations such as multiplications are replaced
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* with lookup tables and software 2's complement operations are
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* replaced with hardware 2's complement.
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* <p>
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* The deviation from the bit level specification (lookup tables)
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* preserves the bit level performance specifications.
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* <p>
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* As outlined in the G.726 Recommendation, the algorithm is broken
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* down into modules. Each section of code below is preceded by
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* the name of the module which it is implementing.
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* <p>
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* This implementation is based on the ANSI-C language reference implementations
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* of the CCITT (International Telegraph and Telephone Consultative Committee)
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* G.711, G.721 and G.723 voice compressions, provided by Sun Microsystems, Inc.
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* <p>
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* Acknowledgement to Sun Microsystems, Inc. for having released the original
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* ANSI-C source code to the public domain.
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*/
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public class G726_32 extends G726 {
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// ##### C-to-Java conversion: #####
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// short becomes int
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// char becomes int
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// unsigned char becomes int
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// *************************** STATIC ***************************
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static /*short*/int[] qtab_721={-124, 80, 178, 246, 300, 349, 400};
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/*
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* Maps G726_32 code word to reconstructed scale factor normalized log
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* magnitude values.
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*/
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static /*short*/int[] _dqlntab={-2048, 4, 135, 213, 273, 323, 373, 425, 425, 373, 323, 273, 213, 135, 4, -2048};
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/* Maps G726_32 code word to log of scale factor multiplier. */
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static /*short*/int[] _witab={-12, 18, 41, 64, 112, 198, 355, 1122, 1122, 355, 198, 112, 64, 41, 18, -12};
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/*
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* Maps G726_32 code words to a set of values whose long and short
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* term averages are computed and then compared to give an indication
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* how stationary (steady state) the signal is.
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*/
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static /*short*/int[] _fitab={0, 0, 0, 0x200, 0x200, 0x200, 0x600, 0xE00, 0xE00, 0x600, 0x200, 0x200, 0x200, 0, 0, 0};
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/** Encodes the input vale of linear PCM, A-law or u-law data sl and returns
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* the resulting code. -1 is returned for unknown input coding value. */
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public static int encode(int sl, int in_coding, G726State state) {
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/*short*/int sezi, se, sez; /* ACCUM */
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/*short*/int d; /* SUBTA */
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/*short*/int sr; /* ADDB */
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/*short*/int y; /* MIX */
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/*short*/int dqsez; /* ADDC */
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/*short*/int dq, i;
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switch (in_coding) {
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/* linearize input sample to 14-bit PCM */
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case AUDIO_ENCODING_ALAW:
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sl= G711Codec.alaw2linear((byte)sl) >> 2;
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break;
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case AUDIO_ENCODING_ULAW:
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sl= G711UCodec.ulaw2linear((byte)sl) >> 2;
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break;
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case AUDIO_ENCODING_LINEAR:
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sl >>= 2; /* 14-bit dynamic range */
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break;
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default:
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return -1;
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}
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sezi=state.predictor_zero();
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sez=sezi >> 1;
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se=(sezi+state.predictor_pole()) >> 1; /* estimated signal */
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d=sl-se; /* estimation difference */
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/* quantize the prediction difference */
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y=state.step_size(); /* quantizer step size */
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i=quantize(d, y, qtab_721, 7); /* i=ADPCM code */
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dq=reconstruct(i & 8, _dqlntab[i], y); /* quantized est diff */
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sr=(dq<0)? se-(dq & 0x3FFF) : se+dq; /* reconst. signal */
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dqsez=sr+sez-se; /* pole prediction diff. */
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update(4, y, _witab[i] << 5, _fitab[i], dq, sr, dqsez, state);
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return i;
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}
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/** Decodes a 4-bit code of G726_32 encoded data of i and
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* returns the resulting linear PCM, A-law or u-law value.
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* return -1 for unknown out_coding value. */
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public static int decode(int i, int out_coding, G726State state) {
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/*short*/int sezi, sei, sez, se; /* ACCUM */
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/*short*/int y; /* MIX */
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/*short*/int sr; /* ADDB */
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/*short*/int dq;
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/*short*/int dqsez;
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i &= 0x0f; /* mask to get proper bits */
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sezi=state.predictor_zero();
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sez=sezi >> 1;
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sei=sezi+state.predictor_pole();
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se=sei >> 1; /* se=estimated signal */
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y=state.step_size(); /* dynamic quantizer step size */
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dq=reconstruct(i & 0x08, _dqlntab[i], y); /* quantized diff. */
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sr=(dq<0)? (se-(dq & 0x3FFF)) : se+dq; /* reconst. signal */
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dqsez=sr-se+sez; /* pole prediction diff. */
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update(4, y, _witab[i] << 5, _fitab[i], dq, sr, dqsez, state);
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switch (out_coding) {
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case AUDIO_ENCODING_ALAW:
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return (tandem_adjust_alaw(sr, se, y, i, 8, qtab_721));
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case AUDIO_ENCODING_ULAW:
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return (tandem_adjust_ulaw(sr, se, y, i, 8, qtab_721));
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case AUDIO_ENCODING_LINEAR:
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return (sr << 2); /* sr was 14-bit dynamic range */
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default:
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return -1;
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}
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}
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/** Encodes the input chunk in_buff of linear PCM, A-law or u-law data and returns
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* the G726_32 encoded chuck into out_buff. <br>
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* It returns the actual size of the output data, or -1 in case of unknown
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* in_coding value. */
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public static int encode(byte[] in_buff, int in_offset, int in_len, int in_coding, byte[] out_buff, int out_offset, G726State state) {
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if (in_coding==AUDIO_ENCODING_ALAW || in_coding==AUDIO_ENCODING_ULAW) {
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/*
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for (int i=0; i<in_len; i++) {
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int in_value=in_buff[in_offset+i];
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int out_value=encode(in_value,in_coding,state);
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int i_div_2=i/2;
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if (i_div_2*2==i)
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out_buff[out_offset+i_div_2]=(byte)(out_value<<4);
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else
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out_buff[out_offset+i_div_2]=(byte)(out_value+unsignedInt(out_buff[out_offset+i_div_2]));
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}
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return in_len/2;
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*/
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int len_div_2=in_len/2;
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for (int i=0; i<len_div_2; i++) {
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int in_index=in_offset+i*2;
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int in_value1=in_buff[in_index];
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int in_value2=in_buff[in_index+1];
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int out_value1=encode(in_value1,in_coding,state);
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int out_value2=encode(in_value2,in_coding,state);
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out_buff[out_offset+i]=(byte)((out_value1<<4) + out_value2);
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}
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return len_div_2;
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}
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else
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if (in_coding==AUDIO_ENCODING_LINEAR) {
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int len_div_4=in_len/4;
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for (int i=0; i<len_div_4; i++) {
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int in_index=in_offset+i*4;
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int in_value1=signedIntLittleEndian(in_buff[in_index+1],in_buff[in_index+0]);
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int in_value2=signedIntLittleEndian(in_buff[in_index+3],in_buff[in_index+2]);
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//int out_value1=encode(G711.linear2ulaw(in_value1),AUDIO_ENCODING_ULAW,state);
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//int out_value2=encode(G711.linear2ulaw(in_value2),AUDIO_ENCODING_ULAW,state);
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int out_value1=encode(in_value1,in_coding,state);
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int out_value2=encode(in_value2,in_coding,state);
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out_buff[out_offset+i]=(byte)((out_value1<<4) + out_value2);
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}
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return len_div_4;
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}
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else return -1;
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}
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/** Decodes the input chunk in_buff of G726_32 encoded data and returns
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* the linear PCM, A-law or u-law chunk into out_buff. <br>
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* It returns the actual size of the output data, or -1 in case of unknown
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* out_coding value. */
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public static int decode(byte[] in_buff, int in_offset, int in_len, int out_coding, byte[] out_buff, int out_offset, G726State state) {
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if (out_coding==AUDIO_ENCODING_ALAW || out_coding==AUDIO_ENCODING_ULAW) {
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/*
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for (int i=0; i<in_len*2; i++) {
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int in_value=unsignedInt(in_buff[in_offset+i/2]);
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if ((i/2)*2==i)
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in_value>>=4;
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else
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in_value%=0x10;
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int out_value=decode(in_value,out_coding,state);
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out_buff[out_offset+i]=(byte)out_value;
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}
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return in_len*2;
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*/
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for (int i=0; i<in_len; i++) {
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int in_value=unsignedInt(in_buff[in_offset+i]);
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int out_value1=decode(in_value>>4,out_coding,state);
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int out_value2=decode(in_value&0xF,out_coding,state);
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int out_index=out_offset+i*2;
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out_buff[out_index]=(byte)out_value1;
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out_buff[out_index+1]=(byte)out_value2;
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}
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return in_len*2;
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}
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else
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if (out_coding==AUDIO_ENCODING_LINEAR) {
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for (int i=0; i<in_len; i++) {
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int in_value=unsignedInt(in_buff[in_offset+i]);
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//int out_value1=G711.ulaw2linear(decode(in_value>>4,AUDIO_ENCODING_ULAW,state));
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//int out_value2=G711.ulaw2linear(decode(in_value&0xF,AUDIO_ENCODING_ULAW,state));
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int out_value1=decode(in_value>>4,out_coding,state);
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int out_value2=decode(in_value&0xF,out_coding,state);
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int out_index=out_offset+i*4;
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out_buff[out_index]=(byte)(out_value1&0xFF);
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out_buff[out_index+1]=(byte)(out_value1>>8);
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out_buff[out_index+2]=(byte)(out_value2&0xFF);
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out_buff[out_index+3]=(byte)(out_value2>>8);
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}
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return in_len*4;
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}
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else return -1;
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}
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// ************************* NON-STATIC *************************
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/** Creates a new G726_32 processor, that can be used to encode from or decode do PCM audio data. */
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public G726_32() {
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super(32000);
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}
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/** Encodes the input vale of linear PCM, A-law or u-law data sl and returns
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* the resulting code. -1 is returned for unknown input coding value. */
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public int encode(int sl, int in_coding) {
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return encode(sl,in_coding,state);
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}
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/** Encodes the input chunk in_buff of linear PCM, A-law or u-law data and returns
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* the G726_32 encoded chuck into out_buff. <br>
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* It returns the actual size of the output data, or -1 in case of unknown
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* in_coding value. */
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public int encode(byte[] in_buff, int in_offset, int in_len, int in_coding, byte[] out_buff, int out_offset) {
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return encode(in_buff,in_offset,in_len,in_coding,out_buff,out_offset,state);
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}
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/** Decodes a 4-bit code of G726_32 encoded data of i and
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* returns the resulting linear PCM, A-law or u-law value.
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* return -1 for unknown out_coding value. */
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public int decode(int i, int out_coding) {
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return decode(i,out_coding,state);
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}
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/** Decodes the input chunk in_buff of G726_32 encoded data and returns
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* the linear PCM, A-law or u-law chunk into out_buff. <br>
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* It returns the actual size of the output data, or -1 in case of unknown
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* out_coding value. */
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public int decode(byte[] in_buff, int in_offset, int in_len, int out_coding, byte[] out_buff, int out_offset) {
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return decode(in_buff,in_offset,in_len,out_coding,out_buff,out_offset,state);
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}
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}
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