static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
    int v, bsize, ch, coef_nb_bits, parse_exponents;
    float mdct_norm;
    int nb_coefs[MAX_CHANNELS];
    static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20};

    //FIXME remove duplication relative to decoder
    if (s->use_variable_block_len) {
        assert(0); //FIXME not implemented
    }else{
        /* fixed block len */
        s->next_block_len_bits = s->frame_len_bits;
        s->prev_block_len_bits = s->frame_len_bits;
        s->block_len_bits = s->frame_len_bits;
    }

    s->block_len = 1 << s->block_len_bits;
//     assert((s->block_pos + s->block_len) <= s->frame_len);
    bsize = s->frame_len_bits - s->block_len_bits;

    //FIXME factor
    v = s->coefs_end[bsize] - s->coefs_start;
    for(ch = 0; ch < s->nb_channels; ch++)
        nb_coefs[ch] = v;
    {
        int n4 = s->block_len / 2;
        mdct_norm = 1.0 / (float)n4;
        if (s->version == 1) {
            mdct_norm *= sqrt(n4);
        }
    }

    if (s->nb_channels == 2) {
        put_bits(&s->pb, 1, !!s->ms_stereo);
    }

    for(ch = 0; ch < s->nb_channels; ch++) {
        s->channel_coded[ch] = 1; //FIXME only set channel_coded when needed, instead of always
        if (s->channel_coded[ch]) {
            init_exp(s, ch, fixed_exp);
        }
    }

    for(ch = 0; ch < s->nb_channels; ch++) {
        if (s->channel_coded[ch]) {
            WMACoef *coefs1;
            float *coefs, *exponents, mult;
            int i, n;

            coefs1 = s->coefs1[ch];
            exponents = s->exponents[ch];
            mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
            mult *= mdct_norm;
            coefs = src_coefs[ch];
            if (s->use_noise_coding && 0) {
                assert(0); //FIXME not implemented
            } else {
                coefs += s->coefs_start;
                n = nb_coefs[ch];
                for(i = 0;i < n; i++){
                    double t= *coefs++ / (exponents[i] * mult);
                    if(t<-32768 || t>32767)
                        return -1;

                    coefs1[i] = lrint(t);
                }
            }
        }
    }

    v = 0;
    for(ch = 0; ch < s->nb_channels; ch++) {
        int a = s->channel_coded[ch];
        put_bits(&s->pb, 1, a);
        v |= a;
    }

    if (!v)
        return 1;

    for(v= total_gain-1; v>=127; v-= 127)
        put_bits(&s->pb, 7, 127);
    put_bits(&s->pb, 7, v);

    coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);

    if (s->use_noise_coding) {
        for(ch = 0; ch < s->nb_channels; ch++) {
            if (s->channel_coded[ch]) {
                int i, n;
                n = s->exponent_high_sizes[bsize];
                for(i=0;i<n;i++) {
                    put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
                    if (0)
                        nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
                }
            }
        }
    }

    parse_exponents = 1;
    if (s->block_len_bits != s->frame_len_bits) {
        put_bits(&s->pb, 1, parse_exponents);
    }

    if (parse_exponents) {
        for(ch = 0; ch < s->nb_channels; ch++) {
            if (s->channel_coded[ch]) {
                if (s->use_exp_vlc) {
                    encode_exp_vlc(s, ch, fixed_exp);
                } else {
                    assert(0); //FIXME not implemented
//                    encode_exp_lsp(s, ch);
                }
            }
        }
    } else {
        assert(0); //FIXME not implemented
    }

    for(ch = 0; ch < s->nb_channels; ch++) {
        if (s->channel_coded[ch]) {
            int run, tindex;
            WMACoef *ptr, *eptr;
            tindex = (ch == 1 && s->ms_stereo);
            ptr = &s->coefs1[ch][0];
            eptr = ptr + nb_coefs[ch];

            run=0;
            for(;ptr < eptr; ptr++){
                if(*ptr){
                    int level= *ptr;
                    int abs_level= FFABS(level);
                    int code= 0;
                    if(abs_level <= s->coef_vlcs[tindex]->max_level){
                        if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
                            code= run + s->int_table[tindex][abs_level-1];
                    }

                    assert(code < s->coef_vlcs[tindex]->n);
                    put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);

                    if(code == 0){
                        if(1<<coef_nb_bits <= abs_level)
                            return -1;

                        put_bits(&s->pb, coef_nb_bits, abs_level);
                        put_bits(&s->pb, s->frame_len_bits, run);
                    }
                    put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere
                    run=0;
                }else{
                    run++;
                }
            }
            if(run)
                put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
        }
        if (s->version == 1 && s->nb_channels >= 2) {
            avpriv_align_put_bits(&s->pb);
        }
    }
    return 0;
}