Function h264_slice_header_init

libavcodec/h264_slice.c:966–1046

}

static int h264_slice_header_init(H264Context *h)
{
    const SPS *sps = h->ps.sps;
    int i, ret;

    if (!sps) {
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    ff_set_sar(h->avctx, sps->vui.sar);
    av_pix_fmt_get_chroma_sub_sample(h->avctx->pix_fmt,
                                     &h->chroma_x_shift, &h->chroma_y_shift);

    if (sps->timing_info_present_flag) {
        int64_t den = sps->time_scale;
        if (h->x264_build < 44U)
            den *= 2;
        av_reduce(&h->avctx->framerate.den, &h->avctx->framerate.num,
                  sps->num_units_in_tick * 2, den, 1 << 30);
    }

    ff_h264_free_tables(h);

    h->first_field           = 0;
    h->prev_interlaced_frame = 1;

    init_scan_tables(h);
    ret = ff_h264_alloc_tables(h);
    if (ret < 0) {
        av_log(h->avctx, AV_LOG_ERROR, "Could not allocate memory\n");
        goto fail;
    }

    if (sps->bit_depth_luma < 8 || sps->bit_depth_luma > 14 ||
        sps->bit_depth_luma == 11 || sps->bit_depth_luma == 13
    ) {
        av_log(h->avctx, AV_LOG_ERROR, "Unsupported bit depth %d\n",
               sps->bit_depth_luma);
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    h->cur_bit_depth_luma         =
    h->avctx->bits_per_raw_sample = sps->bit_depth_luma;
    h->cur_chroma_format_idc      = sps->chroma_format_idc;
    h->pixel_shift                = sps->bit_depth_luma > 8;
    h->chroma_format_idc          = sps->chroma_format_idc;
    h->bit_depth_luma             = sps->bit_depth_luma;

    ff_h264dsp_init(&h->h264dsp, sps->bit_depth_luma,
                    sps->chroma_format_idc);
    ff_h264chroma_init(&h->h264chroma, sps->bit_depth_chroma);
    ff_h264qpel_init(&h->h264qpel, sps->bit_depth_luma);
    ff_h264_pred_init(&h->hpc, AV_CODEC_ID_H264, sps->bit_depth_luma,
                      sps->chroma_format_idc);
    ff_videodsp_init(&h->vdsp, sps->bit_depth_luma);