Function encode_block

libavcodec/wmaenc.c:192–361

}

static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
                        int total_gain)
{
    int channels = s->avctx->ch_layout.nb_channels;
    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) {
        av_unreachable("use_variable_block_len unimplemented, set to 0 during init");
    } 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;
//     av_assert0((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 < 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 (channels == 2)
        put_bits(&s->pb, 1, !!s->ms_stereo);

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

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

            coefs1    = s->coefs1[ch];
            exponents = s->exponents[ch];