1/*
2 * Videotoolbox hardware acceleration for VP9
3 *
4 * copyright (c) 2021 rcombs
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.h"
24#include "videotoolbox.h"
25#include "libavutil/hwcontext_videotoolbox.h"
26#include "vt_internal.h"
27#include "libavutil/avutil.h"
28#include "libavutil/frame.h"
29#include "libavutil/hwcontext.h"
30#include "libavutil/intreadwrite.h"
31#include "libavutil/pixdesc.h"
32#include "decode.h"
33#include "internal.h"
34#include "vp9shared.h"
35
36enum VPX_CHROMA_SUBSAMPLING
37{
38    VPX_SUBSAMPLING_420_VERTICAL = 0,
39    VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA = 1,
40    VPX_SUBSAMPLING_422 = 2,
41    VPX_SUBSAMPLING_444 = 3,
42};
43
44static int get_vpx_chroma_subsampling(enum AVPixelFormat pixel_format,
45                                      enum AVChromaLocation chroma_location)
46{
47    int chroma_w, chroma_h;
48    if (av_pix_fmt_get_chroma_sub_sample(pixel_format, &chroma_w, &chroma_h) == 0) {
49        if (chroma_w == 1 && chroma_h == 1) {
50            return (chroma_location == AVCHROMA_LOC_LEFT)
51                       ? VPX_SUBSAMPLING_420_VERTICAL
52                       : VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA;
53        } else if (chroma_w == 1 && chroma_h == 0) {
54            return VPX_SUBSAMPLING_422;
55        } else if (chroma_w == 0 && chroma_h == 0) {
56            return VPX_SUBSAMPLING_444;
57        }
58    }
59    return -1;
60}
61
62CFDataRef ff_videotoolbox_vpcc_extradata_create(AVCodecContext *avctx)
63{
64    const VP9SharedContext *h = avctx->priv_data;
65    CFDataRef data = NULL;
66    uint8_t *p;
67    int vt_extradata_size;
68    uint8_t *vt_extradata;
69    int subsampling = get_vpx_chroma_subsampling(avctx->sw_pix_fmt, avctx->chroma_sample_location);
70
71    vt_extradata_size = 1 + 3 + 6 + 2;
72    vt_extradata = av_malloc(vt_extradata_size);
73
74    if (subsampling < 0)
75        return NULL;
76
77    if (!vt_extradata)
78        return NULL;
79
80    p = vt_extradata;
81
82    *p++ = 1; /* version */
83    AV_WB24(p + 1, 0); /* flags */
84    p += 3;
85
86   *p++ = h->h.profile;
87   *p++ = avctx->level;
88   *p++ = (h->h.bpp << 4) | (subsampling << 1) | (avctx->color_range == AVCOL_RANGE_JPEG);
89   *p++ = avctx->color_primaries;
90   *p++ = avctx->color_trc;
91   *p++ = avctx->colorspace;
92
93    AV_WB16(p + 0, 0);
94    p += 2;
95
96    av_assert0(p - vt_extradata == vt_extradata_size);
97
98    data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
99    av_free(vt_extradata);
100    return data;
101}
102
103static int videotoolbox_vp9_start_frame(AVCodecContext *avctx,
104                                        const uint8_t *buffer,
105                                        uint32_t size)
106{
107    return 0;
108}
109
110static int videotoolbox_vp9_decode_slice(AVCodecContext *avctx,
111                                         const uint8_t *buffer,
112                                         uint32_t size)
113{
114    VTContext *vtctx = avctx->internal->hwaccel_priv_data;
115
116    return ff_videotoolbox_buffer_copy(vtctx, buffer, size);
117}
118
119static int videotoolbox_vp9_end_frame(AVCodecContext *avctx)
120{
121    const VP9SharedContext *h = avctx->priv_data;
122    AVFrame *frame = h->frames[CUR_FRAME].tf.f;
123
124    return ff_videotoolbox_common_end_frame(avctx, frame);
125}
126
127const AVHWAccel ff_vp9_videotoolbox_hwaccel = {
128    .name           = "vp9_videotoolbox",
129    .type           = AVMEDIA_TYPE_VIDEO,
130    .id             = AV_CODEC_ID_VP9,
131    .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
132    .alloc_frame    = ff_videotoolbox_alloc_frame,
133    .start_frame    = videotoolbox_vp9_start_frame,
134    .decode_slice   = videotoolbox_vp9_decode_slice,
135    .end_frame      = videotoolbox_vp9_end_frame,
136    .frame_params   = ff_videotoolbox_frame_params,
137    .init           = ff_videotoolbox_common_init,
138    .uninit         = ff_videotoolbox_uninit,
139    .priv_data_size = sizeof(VTContext),
140};
141