1 /*
2 * MPEG-4 Part 10 / AVC / H.264 HW decode acceleration through NVDEC
3 *
4 * Copyright (c) 2016 Anton Khirnov
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 <stdint.h>
24 #include <string.h>
25
26 #include "avcodec.h"
27 #include "nvdec.h"
28 #include "decode.h"
29 #include "internal.h"
30 #include "h264dec.h"
31
dpb_add(const H264Context * h,CUVIDH264DPBENTRY * dst,const H264Picture * src,int frame_idx)32 static void dpb_add(const H264Context *h, CUVIDH264DPBENTRY *dst, const H264Picture *src,
33 int frame_idx)
34 {
35 FrameDecodeData *fdd = (FrameDecodeData*)src->f->private_ref->data;
36 const NVDECFrame *cf = fdd->hwaccel_priv;
37
38 dst->PicIdx = cf ? cf->idx : -1;
39 dst->FrameIdx = frame_idx;
40 dst->is_long_term = src->long_ref;
41 dst->not_existing = 0;
42 dst->used_for_reference = src->reference & 3;
43 dst->FieldOrderCnt[0] = src->field_poc[0];
44 dst->FieldOrderCnt[1] = src->field_poc[1];
45 }
46
nvdec_h264_start_frame(AVCodecContext * avctx,const uint8_t * buffer,uint32_t size)47 static int nvdec_h264_start_frame(AVCodecContext *avctx,
48 const uint8_t *buffer, uint32_t size)
49 {
50 const H264Context *h = avctx->priv_data;
51 const PPS *pps = h->ps.pps;
52 const SPS *sps = h->ps.sps;
53
54 NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
55 CUVIDPICPARAMS *pp = &ctx->pic_params;
56 CUVIDH264PICPARAMS *ppc = &pp->CodecSpecific.h264;
57 FrameDecodeData *fdd;
58 NVDECFrame *cf;
59
60 int i, dpb_size, ret;
61
62 ret = ff_nvdec_start_frame(avctx, h->cur_pic_ptr->f);
63 if (ret < 0)
64 return ret;
65
66 fdd = (FrameDecodeData*)h->cur_pic_ptr->f->private_ref->data;
67 cf = (NVDECFrame*)fdd->hwaccel_priv;
68
69 *pp = (CUVIDPICPARAMS) {
70 .PicWidthInMbs = h->mb_width,
71 .FrameHeightInMbs = h->mb_height,
72 .CurrPicIdx = cf->idx,
73 .field_pic_flag = FIELD_PICTURE(h),
74 .bottom_field_flag = h->picture_structure == PICT_BOTTOM_FIELD,
75 .second_field = FIELD_PICTURE(h) && !h->first_field,
76 .ref_pic_flag = h->nal_ref_idc != 0,
77 .intra_pic_flag = 1,
78
79 .CodecSpecific.h264 = {
80 .log2_max_frame_num_minus4 = sps->log2_max_frame_num - 4,
81 .pic_order_cnt_type = sps->poc_type,
82 .log2_max_pic_order_cnt_lsb_minus4 = FFMAX(sps->log2_max_poc_lsb - 4, 0),
83 .delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag,
84 .frame_mbs_only_flag = sps->frame_mbs_only_flag,
85 .direct_8x8_inference_flag = sps->direct_8x8_inference_flag,
86 .num_ref_frames = sps->ref_frame_count,
87 .residual_colour_transform_flag = sps->residual_color_transform_flag,
88 .bit_depth_luma_minus8 = sps->bit_depth_luma - 8,
89 .bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8,
90 .qpprime_y_zero_transform_bypass_flag = sps->transform_bypass,
91
92 .entropy_coding_mode_flag = pps->cabac,
93 .pic_order_present_flag = pps->pic_order_present,
94 .num_ref_idx_l0_active_minus1 = pps->ref_count[0] - 1,
95 .num_ref_idx_l1_active_minus1 = pps->ref_count[1] - 1,
96 .weighted_pred_flag = pps->weighted_pred,
97 .weighted_bipred_idc = pps->weighted_bipred_idc,
98 .pic_init_qp_minus26 = pps->init_qp - 26,
99 .deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present,
100 .redundant_pic_cnt_present_flag = pps->redundant_pic_cnt_present,
101 .transform_8x8_mode_flag = pps->transform_8x8_mode,
102 .MbaffFrameFlag = sps->mb_aff && !FIELD_PICTURE(h),
103 .constrained_intra_pred_flag = pps->constrained_intra_pred,
104 .chroma_qp_index_offset = pps->chroma_qp_index_offset[0],
105 .second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1],
106 .ref_pic_flag = h->nal_ref_idc != 0,
107 .frame_num = h->poc.frame_num,
108 .CurrFieldOrderCnt[0] = h->cur_pic_ptr->field_poc[0],
109 .CurrFieldOrderCnt[1] = h->cur_pic_ptr->field_poc[1],
110 },
111 };
112
113 memcpy(ppc->WeightScale4x4, pps->scaling_matrix4, sizeof(ppc->WeightScale4x4));
114 memcpy(ppc->WeightScale8x8[0], pps->scaling_matrix8[0], sizeof(ppc->WeightScale8x8[0]));
115 memcpy(ppc->WeightScale8x8[1], pps->scaling_matrix8[3], sizeof(ppc->WeightScale8x8[0]));
116
117 dpb_size = 0;
118 for (i = 0; i < h->short_ref_count; i++)
119 dpb_add(h, &ppc->dpb[dpb_size++], h->short_ref[i], h->short_ref[i]->frame_num);
120 for (i = 0; i < 16; i++) {
121 if (h->long_ref[i])
122 dpb_add(h, &ppc->dpb[dpb_size++], h->long_ref[i], i);
123 }
124
125 for (i = dpb_size; i < FF_ARRAY_ELEMS(ppc->dpb); i++)
126 ppc->dpb[i].PicIdx = -1;
127
128 return 0;
129 }
130
nvdec_h264_decode_slice(AVCodecContext * avctx,const uint8_t * buffer,uint32_t size)131 static int nvdec_h264_decode_slice(AVCodecContext *avctx, const uint8_t *buffer,
132 uint32_t size)
133 {
134 NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
135 CUVIDPICPARAMS *pp = &ctx->pic_params;
136 const H264Context *h = avctx->priv_data;
137 const H264SliceContext *sl = &h->slice_ctx[0];
138 void *tmp;
139
140 tmp = av_fast_realloc(ctx->bitstream, &ctx->bitstream_allocated,
141 ctx->bitstream_len + size + 3);
142 if (!tmp)
143 return AVERROR(ENOMEM);
144 ctx->bitstream = tmp;
145
146 tmp = av_fast_realloc(ctx->slice_offsets, &ctx->slice_offsets_allocated,
147 (ctx->nb_slices + 1) * sizeof(*ctx->slice_offsets));
148 if (!tmp)
149 return AVERROR(ENOMEM);
150 ctx->slice_offsets = tmp;
151
152 AV_WB24(ctx->bitstream + ctx->bitstream_len, 1);
153 memcpy(ctx->bitstream + ctx->bitstream_len + 3, buffer, size);
154 ctx->slice_offsets[ctx->nb_slices] = ctx->bitstream_len ;
155 ctx->bitstream_len += size + 3;
156 ctx->nb_slices++;
157
158 if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)
159 pp->intra_pic_flag = 0;
160
161 return 0;
162 }
163
nvdec_h264_frame_params(AVCodecContext * avctx,AVBufferRef * hw_frames_ctx)164 static int nvdec_h264_frame_params(AVCodecContext *avctx,
165 AVBufferRef *hw_frames_ctx)
166 {
167 const H264Context *h = avctx->priv_data;
168 const SPS *sps = h->ps.sps;
169 return ff_nvdec_frame_params(avctx, hw_frames_ctx, sps->ref_frame_count + sps->num_reorder_frames, 0);
170 }
171
172 const AVHWAccel ff_h264_nvdec_hwaccel = {
173 .name = "h264_nvdec",
174 .type = AVMEDIA_TYPE_VIDEO,
175 .id = AV_CODEC_ID_H264,
176 .pix_fmt = AV_PIX_FMT_CUDA,
177 .start_frame = nvdec_h264_start_frame,
178 .end_frame = ff_nvdec_end_frame,
179 .decode_slice = nvdec_h264_decode_slice,
180 .frame_params = nvdec_h264_frame_params,
181 .init = ff_nvdec_decode_init,
182 .uninit = ff_nvdec_decode_uninit,
183 .priv_data_size = sizeof(NVDECContext),
184 };
185