Function decode_subframe

libavcodec/wmalosslessdec.c:839–1017

}

static int decode_subframe(WmallDecodeCtx *s)
{
    int offset        = s->samples_per_frame;
    int subframe_len  = s->samples_per_frame;
    int total_samples = s->samples_per_frame * s->num_channels;
    int i, j, rawpcm_tile, padding_zeroes, res;

    s->subframe_offset = get_bits_count(&s->gb);

    /* reset channel context and find the next block offset and size
        == the next block of the channel with the smallest number of
        decoded samples */
    for (i = 0; i < s->num_channels; i++) {
        if (offset > s->channel[i].decoded_samples) {
            offset = s->channel[i].decoded_samples;
            subframe_len =
                s->channel[i].subframe_len[s->channel[i].cur_subframe];
        }
    }

    /* get a list of all channels that contain the estimated block */
    s->channels_for_cur_subframe = 0;
    for (i = 0; i < s->num_channels; i++) {
        const int cur_subframe = s->channel[i].cur_subframe;
        /* subtract already processed samples */
        total_samples -= s->channel[i].decoded_samples;

        /* and count if there are multiple subframes that match our profile */
        if (offset == s->channel[i].decoded_samples &&
            subframe_len == s->channel[i].subframe_len[cur_subframe]) {
            total_samples -= s->channel[i].subframe_len[cur_subframe];
            s->channel[i].decoded_samples +=
                s->channel[i].subframe_len[cur_subframe];
            s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
            ++s->channels_for_cur_subframe;
        }
    }

    /* check if the frame will be complete after processing the
        estimated block */
    if (!total_samples)
        s->parsed_all_subframes = 1;


    s->seekable_tile = get_bits1(&s->gb);
    if (s->seekable_tile) {
        clear_codec_buffers(s);

        s->do_arith_coding    = get_bits1(&s->gb);
        if (s->do_arith_coding) {
            avpriv_request_sample(s->avctx, "Arithmetic coding");
            return AVERROR_PATCHWELCOME;
        }
        s->do_ac_filter       = get_bits1(&s->gb);
        s->do_inter_ch_decorr = get_bits1(&s->gb);
        s->do_mclms           = get_bits1(&s->gb);

        if (s->do_ac_filter)