Function h264_init_ps

libavcodec/h264_slice.c:1059–1170

}

static int h264_init_ps(H264Context *h, const H264SliceContext *sl, int first_slice)
{
    const SPS *sps;
    int needs_reinit = 0, must_reinit, ret;

    if (first_slice)
        av_refstruct_replace(&h->ps.pps, h->ps.pps_list[sl->pps_id]);

    if (h->ps.sps != h->ps.pps->sps) {
        h->ps.sps = h->ps.pps->sps;

        if (h->mb_width  != h->ps.sps->mb_width ||
            h->mb_height != h->ps.sps->mb_height ||
            h->cur_bit_depth_luma    != h->ps.sps->bit_depth_luma ||
            h->cur_chroma_format_idc != h->ps.sps->chroma_format_idc
        )
            needs_reinit = 1;

        if (h->bit_depth_luma    != h->ps.sps->bit_depth_luma ||
            h->chroma_format_idc != h->ps.sps->chroma_format_idc)
            needs_reinit         = 1;
    }
    sps = h->ps.sps;

    must_reinit = (h->context_initialized &&
                    (   16*sps->mb_width != h->avctx->coded_width
                     || 16*sps->mb_height != h->avctx->coded_height
                     || h->cur_bit_depth_luma    != sps->bit_depth_luma
                     || h->cur_chroma_format_idc != sps->chroma_format_idc
                     || h->mb_width  != sps->mb_width
                     || h->mb_height != sps->mb_height
                    ));
    if (h->avctx->pix_fmt == AV_PIX_FMT_NONE
        || (non_j_pixfmt(h->avctx->pix_fmt) != non_j_pixfmt(get_pixel_format(h, 0))))
        must_reinit = 1;

    if (first_slice && av_cmp_q(sps->vui.sar, h->avctx->sample_aspect_ratio))
        must_reinit = 1;

    if (!h->setup_finished) {
        h->avctx->profile = ff_h264_get_profile(sps);
        h->avctx->level   = sps->level_idc;
        h->avctx->refs    = sps->ref_frame_count;

        h->mb_width  = sps->mb_width;
        h->mb_height = sps->mb_height;
        h->mb_num    = h->mb_width * h->mb_height;
        h->mb_stride = h->mb_width + 1;

        h->b_stride = h->mb_width * 4;

        h->chroma_y_shift = sps->chroma_format_idc <= 1; // 400 uses yuv420p

        h->width  = 16 * h->mb_width;
        h->height = 16 * h->mb_height;

        init_dimensions(h);