Add codecs to librbcodec.

Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>

1 files changed, 0 insertions, 627 deletions

diff --git a/apps/codecs/libffmpegFLAC/decoder.c b/apps/codecs/libffmpegFLAC/decoder.c
deleted file mode 100644
index 2e92c4b..0000000
--- a/apps/codecs/libffmpegFLAC/decoder.c
+++ /dev/null
@@ -1,627 +0,0 @@
-/*
- * FLAC (Free Lossless Audio Codec) decoder
- * Copyright (c) 2003 Alex Beregszaszi
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-
-/**
- * @file flac.c
- * FLAC (Free Lossless Audio Codec) decoder
- * @author Alex Beregszaszi
- *
- * For more information on the FLAC format, visit:
- *  http://flac.sourceforge.net/
- *
- * This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed
- * through, starting from the initial 'fLaC' signature; or by passing the
- * 34-byte streaminfo structure through avctx->extradata[_size] followed
- * by data starting with the 0xFFF8 marker.
- */
-
-#include <inttypes.h>
-#include <stdbool.h>
-#ifndef BUILD_STANDALONE
-#include "codeclib.h"
-#endif
- 
-#include "bitstream.h"
-#include "golomb.h"
-
-#include "decoder.h"
-
-#if defined(CPU_COLDFIRE)
-#include "coldfire.h"
-#elif defined(CPU_ARM)
-#include "arm.h"
-#endif
-
-static const int sample_rate_table[] ICONST_ATTR =
-{ 0, 88200, 176400, 192000,
-  8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
-  0, 0, 0, 0 };
-
-static const int sample_size_table[] ICONST_ATTR = 
-{ 0, 8, 12, 0, 16, 20, 24, 0 };
-
-static const int blocksize_table[] ICONST_ATTR = {
-     0,    192, 576<<0, 576<<1, 576<<2, 576<<3,      0,      0, 
-256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7 
-};
-
-static const uint8_t table_crc8[256] ICONST_ATTR = {
-    0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
-    0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
-    0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
-    0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
-    0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
-    0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
-    0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
-    0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
-    0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
-    0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
-    0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
-    0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
-    0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
-    0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
-    0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
-    0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
-    0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
-    0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
-    0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
-    0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
-    0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
-    0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
-    0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
-    0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
-    0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
-    0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
-    0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
-    0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
-    0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
-    0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
-    0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
-    0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
-};
-
-static int64_t get_utf8(GetBitContext *gb) ICODE_ATTR_FLAC;
-static int64_t get_utf8(GetBitContext *gb)
-{
-    uint64_t val;
-    int ones=0, bytes;
-    
-    while(get_bits1(gb))
-        ones++;
-
-    if     (ones==0) bytes=0;
-    else if(ones==1) return -1;
-    else             bytes= ones - 1;
-    
-    val= get_bits(gb, 7-ones);
-    while(bytes--){
-        const int tmp = get_bits(gb, 8);
-        
-        if((tmp>>6) != 2)
-            return -2;
-        val<<=6;
-        val|= tmp&0x3F;
-    }
-    return val;
-}
-
-static int get_crc8(const uint8_t *buf, int count) ICODE_ATTR_FLAC;
-static int get_crc8(const uint8_t *buf, int count)
-{
-    int crc=0;
-    int i;
-    
-    for(i=0; i<count; i++){
-        crc = table_crc8[crc ^ buf[i]];
-    }
-
-    return crc;
-}
-
-static int decode_residuals(FLACContext *s, int32_t* decoded, int pred_order) ICODE_ATTR_FLAC;
-static int decode_residuals(FLACContext *s, int32_t* decoded, int pred_order)
-{
-    int i, tmp, partition, method_type, rice_order;
-    int sample = 0, samples;
-
-    method_type = get_bits(&s->gb, 2);
-    if (method_type > 1){
-        //fprintf(stderr,"illegal residual coding method %d\n", method_type);
-        return -3;
-    }
-    
-    rice_order = get_bits(&s->gb, 4);
-
-    samples= s->blocksize >> rice_order;
-
-    sample= 
-    i= pred_order;
-    for (partition = 0; partition < (1 << rice_order); partition++)
-    {
-        tmp = get_bits(&s->gb, method_type == 0 ? 4 : 5);
-        if (tmp == (method_type == 0 ? 15 : 31))
-        {
-            //fprintf(stderr,"fixed len partition\n");
-            tmp = get_bits(&s->gb, 5);
-            for (; i < samples; i++, sample++)
-                decoded[sample] = get_sbits(&s->gb, tmp);
-        }
-        else
-        {
-            for (; i < samples; i++, sample++){
-                decoded[sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
-            }
-        }
-        i= 0;
-    }
-
-    return 0;
-}    
-
-static int decode_subframe_fixed(FLACContext *s, int32_t* decoded, int pred_order) ICODE_ATTR_FLAC;
-static int decode_subframe_fixed(FLACContext *s, int32_t* decoded, int pred_order)
-{
-    const int blocksize = s->blocksize;
-    int a, b, c, d, i;
-        
-    /* warm up samples */
-    for (i = 0; i < pred_order; i++)
-    {
-        decoded[i] = get_sbits(&s->gb, s->curr_bps);
-    }
-    
-    if (decode_residuals(s, decoded, pred_order) < 0)
-        return -4;
-
-    a = decoded[pred_order-1];
-    b = a - decoded[pred_order-2];
-    c = b - decoded[pred_order-2] + decoded[pred_order-3];
-    d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
-
-    switch(pred_order)
-    {
-        case 0:
-            break;
-        case 1:
-            for (i = pred_order; i < blocksize; i++)
-                decoded[i] = a += decoded[i];
-            break;
-        case 2:
-            for (i = pred_order; i < blocksize; i++)
-                decoded[i] = a += b += decoded[i];
-            break;
-        case 3:
-            for (i = pred_order; i < blocksize; i++)
-                decoded[i] = a += b += c += decoded[i];
-            break;
-        case 4:
-            for (i = pred_order; i < blocksize; i++)
-                decoded[i] = a += b += c += d += decoded[i];
-            break;
-        default:
-            return -5;
-    }
-
-    return 0;
-}
-
-static int decode_subframe_lpc(FLACContext *s, int32_t* decoded, int pred_order) ICODE_ATTR_FLAC;
-static int decode_subframe_lpc(FLACContext *s, int32_t* decoded, int pred_order)
-{
-    int sum, i, j;
-    int64_t wsum;
-    int coeff_prec, qlevel;
-    int coeffs[pred_order];
-
-    /* warm up samples */
-    for (i = 0; i < pred_order; i++)
-    {
-        decoded[i] = get_sbits(&s->gb, s->curr_bps);
-    }
-    
-    coeff_prec = get_bits(&s->gb, 4) + 1;
-    if (coeff_prec == 16)
-    {
-        //fprintf(stderr,"invalid coeff precision\n");
-        return -6;
-    }
-    qlevel = get_sbits(&s->gb, 5);
-    if (qlevel < 0) 
-    {
-        //fprintf(stderr,"qlevel %d not supported, maybe buggy stream\n", qlevel);
-        return -7;
-    }
-
-    for (i = 0; i < pred_order; i++)
-    {
-        coeffs[i] = get_sbits(&s->gb, coeff_prec);
-    }
-    
-    if (decode_residuals(s, decoded, pred_order) < 0)
-        return -8;
-
-    if ((s->bps + coeff_prec + av_log2(pred_order)) <= 32) {
-        #if defined(CPU_COLDFIRE)
-        (void)sum;
-        lpc_decode_emac(s->blocksize - pred_order, qlevel, pred_order,
-                        decoded + pred_order, coeffs);
-        #elif defined(CPU_ARM)
-        (void)sum;
-        lpc_decode_arm(s->blocksize - pred_order, qlevel, pred_order,
-                       decoded + pred_order, coeffs);
-        #else
-        for (i = pred_order; i < s->blocksize; i++)
-        {
-            sum = 0;
-            for (j = 0; j < pred_order; j++)
-                sum += coeffs[j] * decoded[i-j-1];
-            decoded[i] += sum >> qlevel;
-        }
-        #endif
-    } else {
-        #if defined(CPU_COLDFIRE)
-        (void)wsum;
-        (void)j;
-        lpc_decode_emac_wide(s->blocksize - pred_order, qlevel, pred_order,
-                             decoded + pred_order, coeffs);
-        #else
-        for (i = pred_order; i < s->blocksize; i++)
-        {
-            wsum = 0;
-            for (j = 0; j < pred_order; j++)
-                wsum += (int64_t)coeffs[j] * (int64_t)decoded[i-j-1];
-            decoded[i] += wsum >> qlevel;
-        }
-        #endif
-    }
-    
-    return 0;
-}
-
-static inline int decode_subframe(FLACContext *s, int channel, int32_t* decoded)
-{
-    int type, wasted = 0;
-    int i, tmp;
-    
-    s->curr_bps = s->bps;
-    if(channel == 0){
-        if(s->decorrelation == RIGHT_SIDE)
-            s->curr_bps++;
-    }else{
-        if(s->decorrelation == LEFT_SIDE || s->decorrelation == MID_SIDE)
-            s->curr_bps++;
-    }
-
-    if (get_bits1(&s->gb))
-    {
-        //fprintf(stderr,"invalid subframe padding\n");
-        return -9;
-    }
-    type = get_bits(&s->gb, 6);
-//    wasted = get_bits1(&s->gb);
-    
-//    if (wasted)
-//    {
-//        while (!get_bits1(&s->gb))
-//            wasted++;
-//        if (wasted)
-//            wasted++;
-//        s->curr_bps -= wasted;
-//    }
-#if 0
-    wasted= 16 - av_log2(show_bits(&s->gb, 17));
-    skip_bits(&s->gb, wasted+1);
-    s->curr_bps -= wasted;
-#else
-    if (get_bits1(&s->gb))
-    {
-        wasted = 1;
-        while (!get_bits1(&s->gb))
-            wasted++;
-        s->curr_bps -= wasted;
-        //fprintf(stderr,"%d wasted bits\n", wasted);
-    }
-#endif
-//FIXME use av_log2 for types
-    if (type == 0)
-    {
-        //fprintf(stderr,"coding type: constant\n");
-        tmp = get_sbits(&s->gb, s->curr_bps);
-        for (i = 0; i < s->blocksize; i++)
-            decoded[i] = tmp;
-    }
-    else if (type == 1)
-    {
-        //fprintf(stderr,"coding type: verbatim\n");
-        for (i = 0; i < s->blocksize; i++)
-            decoded[i] = get_sbits(&s->gb, s->curr_bps);
-    }
-    else if ((type >= 8) && (type <= 12))
-    {
-        //fprintf(stderr,"coding type: fixed\n");
-        if (decode_subframe_fixed(s, decoded, type & ~0x8) < 0)
-            return -10;
-    }
-    else if (type >= 32)
-    {
-        //fprintf(stderr,"coding type: lpc\n");
-        if (decode_subframe_lpc(s, decoded, (type & ~0x20)+1) < 0)
-            return -11;
-    }
-    else
-    {
-        //fprintf(stderr,"Unknown coding type: %d\n",type);
-        return -12;
-    }
-        
-    if (wasted)
-    {
-        int i;
-        for (i = 0; i < s->blocksize; i++)
-            decoded[i] <<= wasted;
-    }
-
-    return 0;
-}
-
-static int decode_frame(FLACContext *s,
-                        void (*yield)(void)) ICODE_ATTR_FLAC;
-static int decode_frame(FLACContext *s,
-                        void (*yield)(void))
-{
-    int blocksize_code, sample_rate_code, sample_size_code, assignment, crc8;
-    int decorrelation, bps, blocksize, samplerate;
-    int res, ch;
-    
-    blocksize_code = get_bits(&s->gb, 4);
-
-    sample_rate_code = get_bits(&s->gb, 4);
-    
-    assignment = get_bits(&s->gb, 4); /* channel assignment */
-    if (assignment < 8 && s->channels == assignment+1)
-        decorrelation = INDEPENDENT;
-    else if (assignment >=8 && assignment < 11 && s->channels == 2)
-        decorrelation = LEFT_SIDE + assignment - 8;
-    else
-    {
-        return -13;
-    }
-        
-    sample_size_code = get_bits(&s->gb, 3);
-    if(sample_size_code == 0)
-        bps= s->bps;
-    else if((sample_size_code != 3) && (sample_size_code != 7))
-        bps = sample_size_table[sample_size_code];
-    else 
-    {
-        return -14;
-    }
-
-    if (get_bits1(&s->gb))
-    {
-        return -15;
-    }
-
-    /* Get the samplenumber of the first sample in this block */
-    s->samplenumber=get_utf8(&s->gb);
-
-    /* samplenumber actually contains the frame number for streams
-       with a constant block size - so we multiply by blocksize to
-       get the actual sample number */
-    if (s->min_blocksize == s->max_blocksize) {
-        s->samplenumber*=s->min_blocksize;
-    }
-
-#if 0    
-    if (/*((blocksize_code == 6) || (blocksize_code == 7)) &&*/
-        (s->min_blocksize != s->max_blocksize)){
-    }else{
-    }
-#endif
-
-    if (blocksize_code == 0)
-        blocksize = s->min_blocksize;
-    else if (blocksize_code == 6)
-        blocksize = get_bits(&s->gb, 8)+1;
-    else if (blocksize_code == 7)
-        blocksize = get_bits(&s->gb, 16)+1;
-    else 
-        blocksize = blocksize_table[blocksize_code];
-
-    if(blocksize > s->max_blocksize){
-        return -16;
-    }
-
-    if (sample_rate_code == 0){
-        samplerate= s->samplerate;
-    }else if ((sample_rate_code < 12))
-        samplerate = sample_rate_table[sample_rate_code];
-    else if (sample_rate_code == 12)
-        samplerate = get_bits(&s->gb, 8) * 1000;
-    else if (sample_rate_code == 13)
-        samplerate = get_bits(&s->gb, 16);
-    else if (sample_rate_code == 14)
-        samplerate = get_bits(&s->gb, 16) * 10;
-    else{
-        return -17;
-    }
-
-    skip_bits(&s->gb, 8);
-    crc8= get_crc8(s->gb.buffer, get_bits_count(&s->gb)/8);
-    if(crc8){
-        return -18;
-    }
-    
-    s->blocksize    = blocksize;
-    s->samplerate   = samplerate;
-    s->bps          = bps;
-    s->decorrelation= decorrelation;
-
-    for (ch=0; ch<s->channels; ++ch) {
-        yield();
-        if ((res=decode_subframe(s, ch, s->decoded[ch])) < 0)
-            return res-100;
-    }
-    
-    yield();
-    align_get_bits(&s->gb);
-
-    /* frame footer */
-    skip_bits(&s->gb, 16); /* data crc */
-
-    return 0;
-}
-
-static int flac_downmix(FLACContext *s) ICODE_ATTR_FLAC;
-static int flac_downmix(FLACContext *s)
-{
-    int32_t *FL, *FR, *FC, *SB, *RL, *RR;
-    int32_t *outL = s->decoded[0];
-    int32_t *outR = s->decoded[1];
-    int i, scale=FLAC_OUTPUT_DEPTH-s->bps;
-
-    switch(s->channels)
-    {
-        case 3: /* 3.0 channel order: FL FR FC */
-            FL = s->decoded[0];
-            FR = s->decoded[1];
-            FC = s->decoded[2];
-            /* LF = 0.66 LF + 0.33 FC
-               LR = 0.66 LR + 0.33 FC */
-            for (i=0; i<s->blocksize; ++i) {
-                int32_t a = *(FL)*2 + *(FC);
-                int32_t b = *(FR)*2 + *(FC);
-                *outL++ = ((a + (a<<2))>>4) << scale; /* 1/3 ~= 5>>4 */
-                *outR++ = ((b + (b<<2))>>4) << scale; /* 1/3 ~= 5>>4 */
-                FL++; FR++; FC++;
-            }
-            break;
-        case 4: /* 4.0 channel order: FL FR RL RR */
-            FL = s->decoded[0];
-            FR = s->decoded[1];
-            RL = s->decoded[2];
-            RR = s->decoded[3];
-            /* LF = 0.50 LF + 0.50 RL + 0.00 RR
-               LR = 0.50 LR + 0.00 RL + 0.50 RR */
-            for (i=0; i<s->blocksize; ++i) {
-                int32_t a = *(FL) + *(RL);
-                int32_t b = *(FR) + *(RR);
-                *outL++ = (a>>1) << scale;
-                *outR++ = (b>>1) << scale;
-                FL++; FR++; RL++; RR++;
-            }
-            break;
-        case 5: /* 5.0 channel order: FL FR FC RL RR */
-            FL = s->decoded[0];
-            FR = s->decoded[1];
-            FC = s->decoded[2];
-            RL = s->decoded[3];
-            RR = s->decoded[4];
-            /* LF = 0.40 LF + 0.20 FC + 0.40 RL + 0.00 RR
-               LR = 0.40 LR + 0.20 FC + 0.00 RL + 0.40 RR */
-            for (i=0; i<s->blocksize; ++i) {
-                int32_t a = *(FL)*2 + *(FC) + *(RL)*2;
-                int32_t b = *(FR)*2 + *(FC) + *(RR)*2;
-                *outL++ = ((a + (a<<1))>>4) << scale; /* 3>>4 ~= 1/5 */
-                *outR++ = ((b + (b<<1))>>4) << scale; /* 3>>4 ~= 1/5 */
-                FL++; FR++; FC++; RL++; RR++;
-            }
-            break;
-        case 6: /* 5.1 channel order: FL FR FC SUB RL RR */
-            FL = s->decoded[0];
-            FR = s->decoded[1];
-            FC = s->decoded[2];
-            SB = s->decoded[3];
-            RL = s->decoded[4];
-            RR = s->decoded[5];
-            /* LF = 0.33 LF + 0.16 SUB + 0.16 FC + 0.33 RL + 0.00 RR
-               LR = 0.33 LR + 0.16 SUB + 0.16 FC + 0.00 RL + 0.33 RR */
-            for (i=0; i<s->blocksize; ++i) {
-                int32_t a = *(FL)*2 + *(SB) + *(FC) + *(RL)*2;
-                int32_t b = *(FR)*2 + *(SB) + *(FC) + *(RR)*2;
-                *outL++ = ((a + (a<<2))>>5) << scale; /* 5>>5 ~= 1/6 */
-                *outR++ = ((b + (b<<2))>>5) << scale; /* 5>>5 ~= 1/6 */
-                FL++; FR++; SB++; FC++; RL++; RR++;
-            }
-            break;
-        default: /* 1.0 and 2.0 do not need downmix, other formats unknown. */
-            return -501;
-            break;
-    }
-    return 0;
-}
-
-int flac_decode_frame(FLACContext *s,
-                      uint8_t *buf, int buf_size,
-                      void (*yield)(void))
-{
-    int tmp;
-    int i;
-    int framesize;
-    int scale;
-
-    init_get_bits(&s->gb, buf, buf_size*8);
-
-    tmp = get_bits(&s->gb, 16);
-    if ((tmp & 0xFFFE) != 0xFFF8){
-        return -41;
-    }
-
-    if ((framesize=decode_frame(s,yield)) < 0){
-       s->bitstream_size=0;
-       s->bitstream_index=0;
-       return framesize;
-    }
-
-    yield();
-    
-#define DECORRELATE(left, right)\
-             for (i = 0; i < s->blocksize; i++) {\
-                int32_t a = s->decoded[0][i];\
-                int32_t b = s->decoded[1][i];\
-                s->decoded[0][i] = (left)  << scale;\
-                s->decoded[1][i] = (right) << scale;\
-             }\
-
-    scale=FLAC_OUTPUT_DEPTH-s->bps;
-    switch(s->decorrelation)
-    {
-        case INDEPENDENT:
-            if (s->channels <= 2) {
-                DECORRELATE(a, b) /* Always decorrelate exactly the two supported channels. */
-            } else {
-                if ((tmp=flac_downmix(s)) != 0)
-                    return tmp;
-            }
-            break;
-        case LEFT_SIDE:
-            DECORRELATE(a, a-b)
-            break;
-        case RIGHT_SIDE:
-            DECORRELATE(a+b, b)
-            break;
-        case MID_SIDE:
-            DECORRELATE( (a-=b>>1) + b, a)
-            break;
-    }
-
-    s->framesize = (get_bits_count(&s->gb)+7)>>3;
-
-    return 0;
-}