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 "mpeg4video.h"
25 #include "nvdec.h"
26 #include "decode.h"
27
nvdec_mpeg4_start_frame(AVCodecContext * avctx,const uint8_t * buffer,uint32_t size)28 static int nvdec_mpeg4_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
29 {
30 Mpeg4DecContext *m = avctx->priv_data;
31 MpegEncContext *s = &m->m;
32
33 NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
34 CUVIDPICPARAMS *pp = &ctx->pic_params;
35 CUVIDMPEG4PICPARAMS *ppc = &pp->CodecSpecific.mpeg4;
36 FrameDecodeData *fdd;
37 NVDECFrame *cf;
38 AVFrame *cur_frame = s->current_picture.f;
39
40 int ret, i;
41
42 ret = ff_nvdec_start_frame(avctx, cur_frame);
43 if (ret < 0)
44 return ret;
45
46 fdd = (FrameDecodeData*)cur_frame->private_ref->data;
47 cf = (NVDECFrame*)fdd->hwaccel_priv;
48
49 *pp = (CUVIDPICPARAMS) {
50 .PicWidthInMbs = (cur_frame->width + 15) / 16,
51 .FrameHeightInMbs = (cur_frame->height + 15) / 16,
52 .CurrPicIdx = cf->idx,
53
54 .intra_pic_flag = s->pict_type == AV_PICTURE_TYPE_I,
55 .ref_pic_flag = s->pict_type == AV_PICTURE_TYPE_I ||
56 s->pict_type == AV_PICTURE_TYPE_P ||
57 s->pict_type == AV_PICTURE_TYPE_S,
58
59 .CodecSpecific.mpeg4 = {
60 .ForwardRefIdx = ff_nvdec_get_ref_idx(s->last_picture.f),
61 .BackwardRefIdx = ff_nvdec_get_ref_idx(s->next_picture.f),
62
63 .video_object_layer_width = s->width,
64 .video_object_layer_height = s->height,
65 .vop_time_increment_bitcount = m->time_increment_bits,
66 .top_field_first = s->top_field_first,
67 .resync_marker_disable = !m->resync_marker,
68 .quant_type = s->mpeg_quant,
69 .quarter_sample = s->quarter_sample,
70 .short_video_header = avctx->codec->id == AV_CODEC_ID_H263,
71 .divx_flags = s->divx_packed ? 5 : 0,
72
73 .vop_coding_type = s->pict_type - AV_PICTURE_TYPE_I,
74 .vop_coded = 1,
75 .vop_rounding_type = s->no_rounding,
76 .alternate_vertical_scan_flag = s->alternate_scan,
77 .interlaced = !s->progressive_sequence,
78 .vop_fcode_forward = s->f_code,
79 .vop_fcode_backward = s->b_code,
80 .trd = { s->pp_time, s->pp_field_time >> 1 },
81 .trb = { s->pb_time, s->pb_field_time >> 1 },
82
83 .gmc_enabled = s->pict_type == AV_PICTURE_TYPE_S &&
84 m->vol_sprite_usage == GMC_SPRITE,
85 }
86 };
87
88 for (i = 0; i < 64; ++i) {
89 ppc->QuantMatrixIntra[i] = s->intra_matrix[i];
90 ppc->QuantMatrixInter[i] = s->inter_matrix[i];
91 }
92
93 // We need to pass the full frame buffer and not just the slice
94 return ff_nvdec_simple_decode_slice(avctx, buffer, size);
95 }
96
nvdec_mpeg4_decode_slice(AVCodecContext * avctx,const uint8_t * buffer,uint32_t size)97 static int nvdec_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
98 {
99 return 0;
100 }
101
nvdec_mpeg4_frame_params(AVCodecContext * avctx,AVBufferRef * hw_frames_ctx)102 static int nvdec_mpeg4_frame_params(AVCodecContext *avctx,
103 AVBufferRef *hw_frames_ctx)
104 {
105 // Each frame can at most have one P and one B reference
106 return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2, 0);
107 }
108
109 const AVHWAccel ff_mpeg4_nvdec_hwaccel = {
110 .name = "mpeg4_nvdec",
111 .type = AVMEDIA_TYPE_VIDEO,
112 .id = AV_CODEC_ID_MPEG4,
113 .pix_fmt = AV_PIX_FMT_CUDA,
114 .start_frame = nvdec_mpeg4_start_frame,
115 .end_frame = ff_nvdec_simple_end_frame,
116 .decode_slice = nvdec_mpeg4_decode_slice,
117 .frame_params = nvdec_mpeg4_frame_params,
118 .init = ff_nvdec_decode_init,
119 .uninit = ff_nvdec_decode_uninit,
120 .priv_data_size = sizeof(NVDECContext),
121 };
122