xref: /third_party/ffmpeg/libavcodec/nvdec_vp8.c (revision cabdff1a) 
1/*
2 * VP8 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 "nvdec.h"
25#include "decode.h"
26#include "internal.h"
27#include "vp8.h"
28
29static unsigned char safe_get_ref_idx(VP8Frame *frame)
30{
31    return frame ? ff_nvdec_get_ref_idx(frame->tf.f) : 255;
32}
33
34static int nvdec_vp8_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
35{
36    VP8Context *h = avctx->priv_data;
37
38    NVDECContext      *ctx = avctx->internal->hwaccel_priv_data;
39    CUVIDPICPARAMS     *pp = &ctx->pic_params;
40    FrameDecodeData *fdd;
41    NVDECFrame *cf;
42    AVFrame *cur_frame = h->framep[VP56_FRAME_CURRENT]->tf.f;
43
44    int ret;
45
46    ret = ff_nvdec_start_frame(avctx, cur_frame);
47    if (ret < 0)
48        return ret;
49
50    fdd = (FrameDecodeData*)cur_frame->private_ref->data;
51    cf  = (NVDECFrame*)fdd->hwaccel_priv;
52
53    *pp = (CUVIDPICPARAMS) {
54        .PicWidthInMbs     = (cur_frame->width  + 15) / 16,
55        .FrameHeightInMbs  = (cur_frame->height + 15) / 16,
56        .CurrPicIdx        = cf->idx,
57
58        .CodecSpecific.vp8 = {
59            .width                       = cur_frame->width,
60            .height                      = cur_frame->height,
61
62            .first_partition_size        = h->header_partition_size,
63
64            .LastRefIdx                  = safe_get_ref_idx(h->framep[VP56_FRAME_PREVIOUS]),
65            .GoldenRefIdx                = safe_get_ref_idx(h->framep[VP56_FRAME_GOLDEN]),
66            .AltRefIdx                   = safe_get_ref_idx(h->framep[VP56_FRAME_GOLDEN2]),
67            /*
68             * Explicit braces for anonymous inners and unnamed fields
69             * to work around limitations in ancient versions of gcc.
70             */
71            { // union
72                { // struct
73                    !h->keyframe,             // frame_type
74                    h->profile,               // version
75                    !h->invisible,            // show_frame
76                    h->segmentation.enabled ? // update_mb_segmentation_data
77                        h->segmentation.update_feature_data : 0,
78                }
79            }
80        }
81    };
82
83    return 0;
84}
85
86static int nvdec_vp8_frame_params(AVCodecContext *avctx,
87                                  AVBufferRef *hw_frames_ctx)
88{
89    // VP8 uses a fixed size pool of 3 possible reference frames
90    return ff_nvdec_frame_params(avctx, hw_frames_ctx, 3, 0);
91}
92
93AVHWAccel ff_vp8_nvdec_hwaccel = {
94    .name                 = "vp8_nvdec",
95    .type                 = AVMEDIA_TYPE_VIDEO,
96    .id                   = AV_CODEC_ID_VP8,
97    .pix_fmt              = AV_PIX_FMT_CUDA,
98    .start_frame          = nvdec_vp8_start_frame,
99    .end_frame            = ff_nvdec_simple_end_frame,
100    .decode_slice         = ff_nvdec_simple_decode_slice,
101    .frame_params         = nvdec_vp8_frame_params,
102    .init                 = ff_nvdec_decode_init,
103    .uninit               = ff_nvdec_decode_uninit,
104    .priv_data_size       = sizeof(NVDECContext),
105};
106