Function ff_h264_update_thread_context

libavcodec/h264_slice.c:339–470

static int h264_slice_header_init(H264Context *h);

int ff_h264_update_thread_context(AVCodecContext *dst,
                                  const AVCodecContext *src)
{
    H264Context *h = dst->priv_data, *h1 = src->priv_data;
    int inited = h->context_initialized, err = 0;
    int need_reinit = 0;
    int i, ret;

    if (dst == src)
        return 0;

    if (inited && !h1->ps.sps)
        return AVERROR_INVALIDDATA;

    if (inited &&
        (h->width                 != h1->width                 ||
         h->height                != h1->height                ||
         h->mb_width              != h1->mb_width              ||
         h->mb_height             != h1->mb_height             ||
         !h->ps.sps                                            ||
         h->ps.sps->bit_depth_luma    != h1->ps.sps->bit_depth_luma    ||
         h->ps.sps->chroma_format_idc != h1->ps.sps->chroma_format_idc ||
         h->ps.sps->vui.matrix_coeffs != h1->ps.sps->vui.matrix_coeffs)) {
        need_reinit = 1;
    }

    /* copy block_offset since frame_start may not be called */
    memcpy(h->block_offset, h1->block_offset, sizeof(h->block_offset));

    // SPS/PPS
    for (int i = 0; i < FF_ARRAY_ELEMS(h->ps.sps_list); i++)
        av_refstruct_replace(&h->ps.sps_list[i], h1->ps.sps_list[i]);
    for (int i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++)
        av_refstruct_replace(&h->ps.pps_list[i], h1->ps.pps_list[i]);

    av_refstruct_replace(&h->ps.pps, h1->ps.pps);
    h->ps.sps = h1->ps.sps;

    if (need_reinit || !inited) {
        h->width     = h1->width;
        h->height    = h1->height;
        h->mb_height = h1->mb_height;
        h->mb_width  = h1->mb_width;
        h->mb_num    = h1->mb_num;
        h->mb_stride = h1->mb_stride;
        h->b_stride  = h1->b_stride;
        h->x264_build = h1->x264_build;

        if (h->context_initialized || h1->context_initialized) {
            if ((err = h264_slice_header_init(h)) < 0) {
                av_log(h->avctx, AV_LOG_ERROR, "h264_slice_header_init() failed");
                return err;
            }
        }

        /* copy block_offset since frame_start may not be called */
        memcpy(h->block_offset, h1->block_offset, sizeof(h->block_offset));
    }