1 /*
2 * MPEG-1/2 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 "config_components.h"
24
25 #include "avcodec.h"
26 #include "internal.h"
27 #include "mpegvideo.h"
28 #include "nvdec.h"
29 #include "decode.h"
30
nvdec_mpeg12_start_frame(AVCodecContext * avctx,const uint8_t * buffer,uint32_t size)31 static int nvdec_mpeg12_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
32 {
33 MpegEncContext *s = avctx->priv_data;
34
35 NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
36 CUVIDPICPARAMS *pp = &ctx->pic_params;
37 CUVIDMPEG2PICPARAMS *ppc = &pp->CodecSpecific.mpeg2;
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 .field_pic_flag = s->picture_structure != PICT_FRAME,
57 .bottom_field_flag = s->picture_structure == PICT_BOTTOM_FIELD,
58 .second_field = s->picture_structure != PICT_FRAME && !s->first_field,
59
60 .intra_pic_flag = s->pict_type == AV_PICTURE_TYPE_I,
61 .ref_pic_flag = s->pict_type == AV_PICTURE_TYPE_I ||
62 s->pict_type == AV_PICTURE_TYPE_P,
63
64 .CodecSpecific.mpeg2 = {
65 .ForwardRefIdx = ff_nvdec_get_ref_idx(s->last_picture.f),
66 .BackwardRefIdx = ff_nvdec_get_ref_idx(s->next_picture.f),
67
68 .picture_coding_type = s->pict_type,
69 .full_pel_forward_vector = s->full_pel[0],
70 .full_pel_backward_vector = s->full_pel[1],
71 .f_code = { { s->mpeg_f_code[0][0],
72 s->mpeg_f_code[0][1] },
73 { s->mpeg_f_code[1][0],
74 s->mpeg_f_code[1][1] } },
75 .intra_dc_precision = s->intra_dc_precision,
76 .frame_pred_frame_dct = s->frame_pred_frame_dct,
77 .concealment_motion_vectors = s->concealment_motion_vectors,
78 .q_scale_type = s->q_scale_type,
79 .intra_vlc_format = s->intra_vlc_format,
80 .alternate_scan = s->alternate_scan,
81 .top_field_first = s->top_field_first,
82 }
83 };
84
85 for (i = 0; i < 64; ++i) {
86 int n = s->idsp.idct_permutation[i];
87 ppc->QuantMatrixIntra[i] = s->intra_matrix[n];
88 ppc->QuantMatrixInter[i] = s->inter_matrix[n];
89 }
90
91 return 0;
92 }
93
nvdec_mpeg12_frame_params(AVCodecContext * avctx,AVBufferRef * hw_frames_ctx)94 static int nvdec_mpeg12_frame_params(AVCodecContext *avctx,
95 AVBufferRef *hw_frames_ctx)
96 {
97 // Each frame can at most have one P and one B reference
98 return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2, 0);
99 }
100
101 #if CONFIG_MPEG2_NVDEC_HWACCEL
102 const AVHWAccel ff_mpeg2_nvdec_hwaccel = {
103 .name = "mpeg2_nvdec",
104 .type = AVMEDIA_TYPE_VIDEO,
105 .id = AV_CODEC_ID_MPEG2VIDEO,
106 .pix_fmt = AV_PIX_FMT_CUDA,
107 .start_frame = nvdec_mpeg12_start_frame,
108 .end_frame = ff_nvdec_simple_end_frame,
109 .decode_slice = ff_nvdec_simple_decode_slice,
110 .frame_params = nvdec_mpeg12_frame_params,
111 .init = ff_nvdec_decode_init,
112 .uninit = ff_nvdec_decode_uninit,
113 .priv_data_size = sizeof(NVDECContext),
114 };
115 #endif
116
117 #if CONFIG_MPEG1_NVDEC_HWACCEL
118 const AVHWAccel ff_mpeg1_nvdec_hwaccel = {
119 .name = "mpeg1_nvdec",
120 .type = AVMEDIA_TYPE_VIDEO,
121 .id = AV_CODEC_ID_MPEG1VIDEO,
122 .pix_fmt = AV_PIX_FMT_CUDA,
123 .start_frame = nvdec_mpeg12_start_frame,
124 .end_frame = ff_nvdec_simple_end_frame,
125 .decode_slice = ff_nvdec_simple_decode_slice,
126 .frame_params = nvdec_mpeg12_frame_params,
127 .init = ff_nvdec_decode_init,
128 .uninit = ff_nvdec_decode_uninit,
129 .priv_data_size = sizeof(NVDECContext),
130 };
131 #endif
132