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 "avcodec.h"
24 #include "mpegvideo.h"
25 #include "nvdec.h"
26 #include "decode.h"
27
nvdec_mpeg12_start_frame(AVCodecContext * avctx,const uint8_t * buffer,uint32_t size)28 static int nvdec_mpeg12_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
29 {
30 MpegEncContext *s = avctx->priv_data;
31
32 NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
33 CUVIDPICPARAMS *pp = &ctx->pic_params;
34 CUVIDMPEG2PICPARAMS *ppc = &pp->CodecSpecific.mpeg2;
35 FrameDecodeData *fdd;
36 NVDECFrame *cf;
37 AVFrame *cur_frame = s->current_picture.f;
38
39 int ret, i;
40
41 ret = ff_nvdec_start_frame(avctx, cur_frame);
42 if (ret < 0)
43 return ret;
44
45 fdd = (FrameDecodeData*)cur_frame->private_ref->data;
46 cf = (NVDECFrame*)fdd->hwaccel_priv;
47
48 *pp = (CUVIDPICPARAMS) {
49 .PicWidthInMbs = (cur_frame->width + 15) / 16,
50 .FrameHeightInMbs = (cur_frame->height + 15) / 16,
51 .CurrPicIdx = cf->idx,
52
53 .field_pic_flag = s->picture_structure != PICT_FRAME,
54 .bottom_field_flag = s->picture_structure == PICT_BOTTOM_FIELD,
55 .second_field = s->picture_structure != PICT_FRAME && !s->first_field,
56
57 .intra_pic_flag = s->pict_type == AV_PICTURE_TYPE_I,
58 .ref_pic_flag = s->pict_type == AV_PICTURE_TYPE_I ||
59 s->pict_type == AV_PICTURE_TYPE_P,
60
61 .CodecSpecific.mpeg2 = {
62 .ForwardRefIdx = ff_nvdec_get_ref_idx(s->last_picture.f),
63 .BackwardRefIdx = ff_nvdec_get_ref_idx(s->next_picture.f),
64
65 .picture_coding_type = s->pict_type,
66 .full_pel_forward_vector = s->full_pel[0],
67 .full_pel_backward_vector = s->full_pel[1],
68 .f_code = { { s->mpeg_f_code[0][0],
69 s->mpeg_f_code[0][1] },
70 { s->mpeg_f_code[1][0],
71 s->mpeg_f_code[1][1] } },
72 .intra_dc_precision = s->intra_dc_precision,
73 .frame_pred_frame_dct = s->frame_pred_frame_dct,
74 .concealment_motion_vectors = s->concealment_motion_vectors,
75 .q_scale_type = s->q_scale_type,
76 .intra_vlc_format = s->intra_vlc_format,
77 .alternate_scan = s->alternate_scan,
78 .top_field_first = s->top_field_first,
79 }
80 };
81
82 for (i = 0; i < 64; ++i) {
83 ppc->QuantMatrixIntra[i] = s->intra_matrix[i];
84 ppc->QuantMatrixInter[i] = s->inter_matrix[i];
85 }
86
87 return 0;
88 }
89
nvdec_mpeg12_frame_params(AVCodecContext * avctx,AVBufferRef * hw_frames_ctx)90 static int nvdec_mpeg12_frame_params(AVCodecContext *avctx,
91 AVBufferRef *hw_frames_ctx)
92 {
93 // Each frame can at most have one P and one B reference
94 return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2, 0);
95 }
96
97 #if CONFIG_MPEG2_NVDEC_HWACCEL
98 const AVHWAccel ff_mpeg2_nvdec_hwaccel = {
99 .name = "mpeg2_nvdec",
100 .type = AVMEDIA_TYPE_VIDEO,
101 .id = AV_CODEC_ID_MPEG2VIDEO,
102 .pix_fmt = AV_PIX_FMT_CUDA,
103 .start_frame = nvdec_mpeg12_start_frame,
104 .end_frame = ff_nvdec_simple_end_frame,
105 .decode_slice = ff_nvdec_simple_decode_slice,
106 .frame_params = nvdec_mpeg12_frame_params,
107 .init = ff_nvdec_decode_init,
108 .uninit = ff_nvdec_decode_uninit,
109 .priv_data_size = sizeof(NVDECContext),
110 };
111 #endif
112
113 #if CONFIG_MPEG1_NVDEC_HWACCEL
114 const AVHWAccel ff_mpeg1_nvdec_hwaccel = {
115 .name = "mpeg1_nvdec",
116 .type = AVMEDIA_TYPE_VIDEO,
117 .id = AV_CODEC_ID_MPEG1VIDEO,
118 .pix_fmt = AV_PIX_FMT_CUDA,
119 .start_frame = nvdec_mpeg12_start_frame,
120 .end_frame = ff_nvdec_simple_end_frame,
121 .decode_slice = ff_nvdec_simple_decode_slice,
122 .frame_params = nvdec_mpeg12_frame_params,
123 .init = ff_nvdec_decode_init,
124 .uninit = ff_nvdec_decode_uninit,
125 .priv_data_size = sizeof(NVDECContext),
126 };
127 #endif
128