--- /dev/null
+/*
+ * MPEG-4 Part 2 HW decode acceleration through NVDEC
+ *
+ * Copyright (c) 2017 Philip Langdale
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "mpeg4video.h"
+#include "nvdec.h"
+#include "decode.h"
+
+static int nvdec_mpeg4_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
+{
+ Mpeg4DecContext *m = avctx->priv_data;
+ MpegEncContext *s = &m->m;
+
+ NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
+ CUVIDPICPARAMS *pp = &ctx->pic_params;
+ CUVIDMPEG4PICPARAMS *ppc = &pp->CodecSpecific.mpeg4;
+ FrameDecodeData *fdd;
+ NVDECFrame *cf;
+ AVFrame *cur_frame = s->current_picture.f;
+
+ int ret, i;
+
+ ret = ff_nvdec_start_frame(avctx, cur_frame);
+ if (ret < 0)
+ return ret;
+
+ fdd = (FrameDecodeData*)cur_frame->private_ref->data;
+ cf = (NVDECFrame*)fdd->hwaccel_priv;
+
+ *pp = (CUVIDPICPARAMS) {
+ .PicWidthInMbs = (cur_frame->width + 15) / 16,
+ .FrameHeightInMbs = (cur_frame->height + 15) / 16,
+ .CurrPicIdx = cf->idx,
+
+ .intra_pic_flag = s->pict_type == AV_PICTURE_TYPE_I,
+ .ref_pic_flag = s->pict_type == AV_PICTURE_TYPE_I ||
+ s->pict_type == AV_PICTURE_TYPE_P ||
+ s->pict_type == AV_PICTURE_TYPE_S,
+
+ .CodecSpecific.mpeg4 = {
+ .ForwardRefIdx = ff_nvdec_get_ref_idx(s->last_picture.f),
+ .BackwardRefIdx = ff_nvdec_get_ref_idx(s->next_picture.f),
+
+ .video_object_layer_width = s->width,
+ .video_object_layer_height = s->height,
+ .vop_time_increment_bitcount = m->time_increment_bits,
+ .top_field_first = s->top_field_first,
+ .resync_marker_disable = !m->resync_marker,
+ .quant_type = s->mpeg_quant,
+ .quarter_sample = s->quarter_sample,
+ .short_video_header = avctx->codec->id == AV_CODEC_ID_H263,
+ .divx_flags = s->divx_packed ? 5 : 0,
+
+ .vop_coding_type = s->pict_type - AV_PICTURE_TYPE_I,
+ .vop_coded = 1,
+ .vop_rounding_type = s->no_rounding,
+ .alternate_vertical_scan_flag = s->alternate_scan,
+ .interlaced = !s->progressive_sequence,
+ .vop_fcode_forward = s->f_code,
+ .vop_fcode_backward = s->b_code,
+ .trd = { s->pp_time, s->pp_field_time >> 1 },
+ .trb = { s->pb_time, s->pb_field_time >> 1 },
+
+ .gmc_enabled = s->pict_type == AV_PICTURE_TYPE_S &&
+ m->vol_sprite_usage == GMC_SPRITE,
+ }
+ };
+
+ for (i = 0; i < 64; ++i) {
+ ppc->QuantMatrixIntra[i] = s->intra_matrix[i];
+ ppc->QuantMatrixInter[i] = s->inter_matrix[i];
+ }
+
+ // We need to pass the full frame buffer and not just the slice
+ return ff_nvdec_simple_decode_slice(avctx, buffer, size);
+}
+
+static int nvdec_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
+{
+ return 0;
+}
+
+static int nvdec_mpeg4_frame_params(AVCodecContext *avctx,
+ AVBufferRef *hw_frames_ctx)
+{
+ // Each frame can at most have one P and one B reference
+ return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2);
+}
+
+AVHWAccel ff_mpeg4_nvdec_hwaccel = {
+ .name = "mpeg4_nvdec",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_MPEG4,
+ .pix_fmt = AV_PIX_FMT_CUDA,
+ .start_frame = nvdec_mpeg4_start_frame,
+ .end_frame = ff_nvdec_simple_end_frame,
+ .decode_slice = nvdec_mpeg4_decode_slice,
+ .frame_params = nvdec_mpeg4_frame_params,
+ .init = ff_nvdec_decode_init,
+ .uninit = ff_nvdec_decode_uninit,
+ .priv_data_size = sizeof(NVDECContext),
+};
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