Function wavpack_encode_block

libavcodec/wavpackenc.c:2469–2821

}

static int wavpack_encode_block(WavPackEncodeContext *s,
                                int32_t *samples_l, int32_t *samples_r,
                                uint8_t *out, int out_size)
{
    int block_size, start, end, data_size, tcount, temp, m = 0;
    int i, j, ret = 0, got_extra = 0, nb_samples = s->block_samples;
    uint32_t crc = 0xffffffffu;
    struct Decorr *dpp;
    PutByteContext pb;

    if (s->flags & WV_MONO_DATA) {
        CLEAR(s->w);
    }
    if (!(s->flags & WV_MONO) && s->optimize_mono) {
        int32_t lor = 0, diff = 0;

        for (i = 0; i < nb_samples; i++) {
            lor  |= samples_l[i] | samples_r[i];
            diff |= samples_l[i] - samples_r[i];

            if (lor && diff)
                break;
        }

        if (i == nb_samples && lor && !diff) {
            s->flags &= ~(WV_JOINT_STEREO | WV_CROSS_DECORR);
            s->flags |= WV_FALSE_STEREO;

            if (!s->false_stereo) {
                s->false_stereo = 1;
                s->num_terms = 0;
                CLEAR(s->w);
            }
        } else if (s->false_stereo) {
            s->false_stereo = 0;
            s->num_terms = 0;
            CLEAR(s->w);
        }
    }

    if (s->flags & SHIFT_MASK) {
        int shift = (s->flags & SHIFT_MASK) >> SHIFT_LSB;
        int mag = (s->flags & MAG_MASK) >> MAG_LSB;

        if (s->flags & WV_MONO_DATA)
            shift_mono(samples_l, nb_samples, shift);
        else
            shift_stereo(samples_l, samples_r, nb_samples, shift);

        if ((mag -= shift) < 0)
            s->flags &= ~MAG_MASK;
        else
            s->flags -= (1 << MAG_LSB) * shift;
    }

    if ((s->flags & WV_FLOAT_DATA) || (s->flags & MAG_MASK) >> MAG_LSB >= 24) {
        av_fast_padded_malloc(&s->orig_l, &s->orig_l_size, sizeof(int32_t) * nb_samples);
        memcpy(s->orig_l, samples_l, sizeof(int32_t) * nb_samples);