Function mpv_reconstruct_mb_internal

libavcodec/mpegvideo_dec.c:933–1103

generic function called after a macroblock has been parsed by the decoder. Important variables used: s->mb_intra : true if intra macroblock s->mv_dir : motion vector direction s->mv_type : motion vector type s->mv : motion vector s->interlaced_dct : true if interlaced dct used (mpeg2) */

   s->interlaced_dct : true if interlaced dct used (mpeg2)
 */
static av_always_inline
void mpv_reconstruct_mb_internal(MpegEncContext *s, int16_t block[12][64],
                                 int lowres_flag, int is_mpeg12)
{
#define IS_MPEG12_H261(s) (is_mpeg12 == MAY_BE_MPEG12_H261 ? ((s)->out_format <= FMT_H261) : is_mpeg12)
    uint8_t *dest_y = s->dest[0], *dest_cb = s->dest[1], *dest_cr = s->dest[2];
    int dct_linesize, dct_offset;
    const int linesize   = s->cur_pic.linesize[0]; //not s->linesize as this would be wrong for field pics
    const int uvlinesize = s->cur_pic.linesize[1];
    const int block_size = lowres_flag ? 8 >> s->avctx->lowres : 8;

    dct_linesize = linesize << s->interlaced_dct;
    dct_offset   = s->interlaced_dct ? linesize : linesize * block_size;

    if (!s->mb_intra) {
        /* motion handling */
        if (HAVE_THREADS && is_mpeg12 != DEFINITELY_MPEG12_H261 &&
            s->avctx->active_thread_type & FF_THREAD_FRAME) {
            if (s->mv_dir & MV_DIR_FORWARD) {
                ff_thread_progress_await(&s->last_pic.ptr->progress,
                                         lowest_referenced_row(s, 0));
            }
            if (s->mv_dir & MV_DIR_BACKWARD) {
                ff_thread_progress_await(&s->next_pic.ptr->progress,
                                         lowest_referenced_row(s, 1));
            }
        }

        if (lowres_flag) {
            const h264_chroma_mc_func *op_pix = s->h264chroma.put_h264_chroma_pixels_tab;

            if (s->mv_dir & MV_DIR_FORWARD) {
                MPV_motion_lowres(s, dest_y, dest_cb, dest_cr, 0, s->last_pic.data, op_pix);
                op_pix = s->h264chroma.avg_h264_chroma_pixels_tab;
            }
            if (s->mv_dir & MV_DIR_BACKWARD) {
                MPV_motion_lowres(s, dest_y, dest_cb, dest_cr, 1, s->next_pic.data, op_pix);
            }
        } else {
            const op_pixels_func (*op_pix)[4];
            const qpel_mc_func (*op_qpix)[16];

            if ((is_mpeg12 == DEFINITELY_MPEG12_H261 || !s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
                op_pix  = s->hdsp.put_pixels_tab;
                op_qpix = s->qdsp.put_qpel_pixels_tab;
            } else {
                op_pix  = s->hdsp.put_no_rnd_pixels_tab;
                op_qpix = s->qdsp.put_no_rnd_qpel_pixels_tab;
            }
            if (s->mv_dir & MV_DIR_FORWARD) {
                ff_mpv_motion(s, dest_y, dest_cb, dest_cr, 0, s->last_pic.data, op_pix, op_qpix);
                op_pix  = s->hdsp.avg_pixels_tab;
                op_qpix = s->qdsp.avg_qpel_pixels_tab;
            }
            if (s->mv_dir & MV_DIR_BACKWARD) {
                ff_mpv_motion(s, dest_y, dest_cb, dest_cr, 1, s->next_pic.data, op_pix, op_qpix);
            }
        }