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/*
* Videotoolbox hardware acceleration for VP9
*
* copyright (c) 2021 rcombs
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "videotoolbox.h"
#include "libavutil/hwcontext_videotoolbox.h"
#include "vt_internal.h"
#include "libavutil/avutil.h"
#include "libavutil/frame.h"
#include "libavutil/hwcontext.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/pixdesc.h"
#include "decode.h"
#include "internal.h"
#include "vp9shared.h"
enum VPX_CHROMA_SUBSAMPLING
{
VPX_SUBSAMPLING_420_VERTICAL = 0,
VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA = 1,
VPX_SUBSAMPLING_422 = 2,
VPX_SUBSAMPLING_444 = 3,
};
static int get_vpx_chroma_subsampling(enum AVPixelFormat pixel_format,
enum AVChromaLocation chroma_location)
{
int chroma_w, chroma_h;
if (av_pix_fmt_get_chroma_sub_sample(pixel_format, &chroma_w, &chroma_h) == 0) {
if (chroma_w == 1 && chroma_h == 1) {
return (chroma_location == AVCHROMA_LOC_LEFT)
? VPX_SUBSAMPLING_420_VERTICAL
: VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA;
} else if (chroma_w == 1 && chroma_h == 0) {
return VPX_SUBSAMPLING_422;
} else if (chroma_w == 0 && chroma_h == 0) {
return VPX_SUBSAMPLING_444;
}
}
return -1;
}
CFDataRef ff_videotoolbox_vpcc_extradata_create(AVCodecContext *avctx)
{
const VP9SharedContext *h = avctx->priv_data;
CFDataRef data = NULL;
uint8_t *p;
int vt_extradata_size;
uint8_t *vt_extradata;
int subsampling = get_vpx_chroma_subsampling(avctx->sw_pix_fmt, avctx->chroma_sample_location);
vt_extradata_size = 1 + 3 + 6 + 2;
vt_extradata = av_malloc(vt_extradata_size);
if (subsampling < 0)
return NULL;
if (!vt_extradata)
return NULL;
p = vt_extradata;
*p++ = 1; /* version */
AV_WB24(p + 1, 0); /* flags */
p += 3;
*p++ = h->h.profile;
*p++ = avctx->level;
*p++ = (h->h.bpp << 4) | (subsampling << 1) | (avctx->color_range == AVCOL_RANGE_JPEG);
*p++ = avctx->color_primaries;
*p++ = avctx->color_trc;
*p++ = avctx->colorspace;
AV_WB16(p + 0, 0);
p += 2;
av_assert0(p - vt_extradata == vt_extradata_size);
data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
av_free(vt_extradata);
return data;
}
static int videotoolbox_vp9_start_frame(AVCodecContext *avctx,
const uint8_t *buffer,
uint32_t size)
{
return 0;
}
static int videotoolbox_vp9_decode_slice(AVCodecContext *avctx,
const uint8_t *buffer,
uint32_t size)
{
VTContext *vtctx = avctx->internal->hwaccel_priv_data;
return ff_videotoolbox_buffer_copy(vtctx, buffer, size);
}
static int videotoolbox_vp9_end_frame(AVCodecContext *avctx)
{
const VP9SharedContext *h = avctx->priv_data;
AVFrame *frame = h->frames[CUR_FRAME].tf.f;
return ff_videotoolbox_common_end_frame(avctx, frame);
}
const AVHWAccel ff_vp9_videotoolbox_hwaccel = {
.name = "vp9_videotoolbox",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_VP9,
.pix_fmt = AV_PIX_FMT_VIDEOTOOLBOX,
.alloc_frame = ff_videotoolbox_alloc_frame,
.start_frame = videotoolbox_vp9_start_frame,
.decode_slice = videotoolbox_vp9_decode_slice,
.end_frame = videotoolbox_vp9_end_frame,
.frame_params = ff_videotoolbox_frame_params,
.init = ff_videotoolbox_common_init,
.uninit = ff_videotoolbox_uninit,
.priv_data_size = sizeof(VTContext),
};
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