1/*
2 * MPEG-4 Part 2 HW decode acceleration through NVDEC
3 *
4 * Copyright (c) 2017 Philip Langdale
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include "avcodec.h"
24#include "internal.h"
25#include "mpeg4video.h"
26#include "mpeg4videodec.h"
27#include "nvdec.h"
28#include "decode.h"
29
30static int nvdec_mpeg4_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
31{
32    Mpeg4DecContext *m = avctx->priv_data;
33    MpegEncContext *s = &m->m;
34
35    NVDECContext      *ctx = avctx->internal->hwaccel_priv_data;
36    CUVIDPICPARAMS     *pp = &ctx->pic_params;
37    CUVIDMPEG4PICPARAMS *ppc = &pp->CodecSpecific.mpeg4;
38    FrameDecodeData *fdd;
39    NVDECFrame *cf;
40    AVFrame *cur_frame = s->current_picture.f;
41
42    int ret, i;
43
44    ret = ff_nvdec_start_frame(avctx, cur_frame);
45    if (ret < 0)
46        return ret;
47
48    fdd = (FrameDecodeData*)cur_frame->private_ref->data;
49    cf  = (NVDECFrame*)fdd->hwaccel_priv;
50
51    *pp = (CUVIDPICPARAMS) {
52        .PicWidthInMbs     = (cur_frame->width  + 15) / 16,
53        .FrameHeightInMbs  = (cur_frame->height + 15) / 16,
54        .CurrPicIdx        = cf->idx,
55
56        .intra_pic_flag    = s->pict_type == AV_PICTURE_TYPE_I,
57        .ref_pic_flag      = s->pict_type == AV_PICTURE_TYPE_I ||
58                             s->pict_type == AV_PICTURE_TYPE_P ||
59                             s->pict_type == AV_PICTURE_TYPE_S,
60
61        .CodecSpecific.mpeg4 = {
62            .ForwardRefIdx                = ff_nvdec_get_ref_idx(s->last_picture.f),
63            .BackwardRefIdx               = ff_nvdec_get_ref_idx(s->next_picture.f),
64
65            .video_object_layer_width     = s->width,
66            .video_object_layer_height    = s->height,
67            .vop_time_increment_bitcount  = m->time_increment_bits,
68            .top_field_first              = s->top_field_first,
69            .resync_marker_disable        = !m->resync_marker,
70            .quant_type                   = s->mpeg_quant,
71            .quarter_sample               = s->quarter_sample,
72            .short_video_header           = avctx->codec->id == AV_CODEC_ID_H263,
73            .divx_flags                   = s->divx_packed ? 5 : 0,
74
75            .vop_coding_type              = s->pict_type - AV_PICTURE_TYPE_I,
76            .vop_coded                    = 1,
77            .vop_rounding_type            = s->no_rounding,
78            .alternate_vertical_scan_flag = s->alternate_scan,
79            .interlaced                   = !s->progressive_sequence,
80            .vop_fcode_forward            = s->f_code,
81            .vop_fcode_backward           = s->b_code,
82            .trd                          = { s->pp_time, s->pp_field_time >> 1 },
83            .trb                          = { s->pb_time, s->pb_field_time >> 1 },
84
85            .gmc_enabled                  = s->pict_type == AV_PICTURE_TYPE_S &&
86                                            m->vol_sprite_usage == GMC_SPRITE,
87        }
88    };
89
90    for (i = 0; i < 64; ++i) {
91        int n = s->idsp.idct_permutation[i];
92        ppc->QuantMatrixIntra[i] = s->intra_matrix[n];
93        ppc->QuantMatrixInter[i] = s->inter_matrix[n];
94    }
95
96    // We need to pass the full frame buffer and not just the slice
97    return ff_nvdec_simple_decode_slice(avctx, buffer, size);
98}
99
100static int nvdec_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
101{
102    return 0;
103}
104
105static int nvdec_mpeg4_frame_params(AVCodecContext *avctx,
106                                  AVBufferRef *hw_frames_ctx)
107{
108    // Each frame can at most have one P and one B reference
109    return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2, 0);
110}
111
112const AVHWAccel ff_mpeg4_nvdec_hwaccel = {
113    .name                 = "mpeg4_nvdec",
114    .type                 = AVMEDIA_TYPE_VIDEO,
115    .id                   = AV_CODEC_ID_MPEG4,
116    .pix_fmt              = AV_PIX_FMT_CUDA,
117    .start_frame          = nvdec_mpeg4_start_frame,
118    .end_frame            = ff_nvdec_simple_end_frame,
119    .decode_slice         = nvdec_mpeg4_decode_slice,
120    .frame_params         = nvdec_mpeg4_frame_params,
121    .init                 = ff_nvdec_decode_init,
122    .uninit               = ff_nvdec_decode_uninit,
123    .priv_data_size       = sizeof(NVDECContext),
124};
125