Function vaapi_mpeg2_decode_slice

libavcodec/vaapi_mpeg2.c:107–139

}

static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
{
    MpegEncContext * const s = avctx->priv_data;
    VASliceParameterBufferMPEG2 *slice_param;
    GetBitContext gb;
    uint32_t start_code, quantiser_scale_code, intra_slice_flag, macroblock_offset;

    dprintf(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);

    /* Determine macroblock_offset */
    init_get_bits(&gb, buffer, 8 * size);
    start_code = get_bits(&gb, 32);
    assert((start_code & 0xffffff00) == 0x00000100);
    quantiser_scale_code = get_bits(&gb, 5);
    intra_slice_flag = get_bits1(&gb);
    if (intra_slice_flag) {
        skip_bits(&gb, 8);
        while (get_bits1(&gb) != 0)
            skip_bits(&gb, 8);
    }
    macroblock_offset = get_bits_count(&gb);

    /* Fill in VASliceParameterBufferMPEG2 */
    slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
    if (!slice_param)
        return -1;
    slice_param->macroblock_offset              = macroblock_offset;
    slice_param->slice_horizontal_position      = s->mb_x;
    slice_param->slice_vertical_position        = s->mb_y;
    slice_param->quantiser_scale_code           = quantiser_scale_code;
    slice_param->intra_slice_flag               = intra_slice_flag;
    return 0;
}

AVHWAccel mpeg2_vaapi_hwaccel = {
    .name           = "mpeg2_vaapi",