| /* |
| * 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, 0); |
| } |
| |
| const 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), |
| }; |