Function commit_bitstream_and_slice_buffer

libavcodec/dxva2_vc1.c:157–208

}

static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
                                             DXVA2_DecodeBufferDesc *bs,
                                             DXVA2_DecodeBufferDesc *sc)
{
    const VC1Context *v = avctx->priv_data;
    struct dxva_context *ctx = avctx->hwaccel_context;
    const MpegEncContext *s = &v->s;
    struct dxva2_picture_context *ctx_pic = s->current_picture_ptr->hwaccel_picture_private;

    DXVA_SliceInfo *slice = &ctx_pic->si;

    static const uint8_t start_code[] = { 0, 0, 1, 0x0d };
    const unsigned start_code_size = avctx->codec_id == CODEC_ID_VC1 ? sizeof(start_code) : 0;
    const unsigned slice_size = slice->dwSliceBitsInBuffer / 8;
    const unsigned padding = 128 - ((start_code_size + slice_size) & 127);
    const unsigned data_size = start_code_size + slice_size + padding;

    uint8_t  *dxva_data;
    unsigned dxva_size;
    int result;

    if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
                                              DXVA2_BitStreamDateBufferType,
                                              &dxva_data, &dxva_size)))
        return -1;

    result = data_size <= dxva_size ? 0 : -1;
    if (!result) {
        if (start_code_size > 0)
            memcpy(dxva_data, start_code, start_code_size);
        memcpy(dxva_data + start_code_size,
               ctx_pic->bitstream + slice->dwSliceDataLocation, slice_size);
        if (padding > 0)
            memset(dxva_data + start_code_size + slice_size, 0, padding);
        slice->dwSliceBitsInBuffer = 8 * data_size;
    }
    if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
                                                  DXVA2_BitStreamDateBufferType)))
        return -1;
    if (result)
        return result;

    memset(bs, 0, sizeof(*bs));
    bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
    bs->DataSize             = data_size;
    bs->NumMBsInBuffer       = s->mb_width * s->mb_height;
    assert((bs->DataSize & 127) == 0);

    return ff_dxva2_commit_buffer(avctx, ctx, sc,
                                  DXVA2_SliceControlBufferType,
                                  slice, sizeof(*slice), bs->NumMBsInBuffer);
}

static int start_frame(AVCodecContext *avctx,
                       av_unused const uint8_t *buffer,