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/*
* Copyright (c) 2023 Zhao Zhili <zhilizhao@tencent.com>
*
* 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 <VideoToolbox/VideoToolbox.h>
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_videotoolbox.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
#include "scale_eval.h"
typedef struct ScaleVtContext {
AVClass *class;
VTPixelTransferSessionRef transfer;
int output_width;
int output_height;
char *w_expr;
char *h_expr;
enum AVColorPrimaries colour_primaries;
enum AVColorTransferCharacteristic colour_transfer;
enum AVColorSpace colour_matrix;
char *colour_primaries_string;
char *colour_transfer_string;
char *colour_matrix_string;
} ScaleVtContext;
static av_cold int scale_vt_init(AVFilterContext *avctx)
{
ScaleVtContext *s = avctx->priv;
int ret;
CFStringRef value;
ret = VTPixelTransferSessionCreate(kCFAllocatorDefault, &s->transfer);
if (ret != noErr) {
av_log(avctx, AV_LOG_ERROR, "transfer session create failed, %d\n", ret);
return AVERROR_EXTERNAL;
}
#define STRING_OPTION(var_name, func_name, default_value) \
do { \
if (s->var_name##_string) { \
int var = av_##func_name##_from_name(s->var_name##_string); \
if (var < 0) { \
av_log(avctx, AV_LOG_ERROR, "Invalid %s.\n", #var_name); \
return AVERROR(EINVAL); \
} \
s->var_name = var; \
} else { \
s->var_name = default_value; \
} \
} while (0)
STRING_OPTION(colour_primaries, color_primaries, AVCOL_PRI_UNSPECIFIED);
STRING_OPTION(colour_transfer, color_transfer, AVCOL_TRC_UNSPECIFIED);
STRING_OPTION(colour_matrix, color_space, AVCOL_SPC_UNSPECIFIED);
if (s->colour_primaries != AVCOL_PRI_UNSPECIFIED) {
value = av_map_videotoolbox_color_primaries_from_av(s->colour_primaries);
if (!value) {
av_log(avctx, AV_LOG_ERROR,
"Doesn't support converting to colour primaries %s\n",
s->colour_primaries_string);
return AVERROR(ENOTSUP);
}
VTSessionSetProperty(s->transfer, kVTPixelTransferPropertyKey_DestinationColorPrimaries, value);
}
if (s->colour_transfer != AVCOL_TRC_UNSPECIFIED) {
value = av_map_videotoolbox_color_trc_from_av(s->colour_transfer);
if (!value) {
av_log(avctx, AV_LOG_ERROR,
"Doesn't support converting to trc %s\n",
s->colour_transfer_string);
return AVERROR(ENOTSUP);
}
VTSessionSetProperty(s->transfer, kVTPixelTransferPropertyKey_DestinationTransferFunction, value);
}
if (s->colour_matrix != AVCOL_SPC_UNSPECIFIED) {
value = av_map_videotoolbox_color_matrix_from_av(s->colour_matrix);
if (!value) {
av_log(avctx, AV_LOG_ERROR,
"Doesn't support converting to colorspace %s\n",
s->colour_matrix_string);
return AVERROR(ENOTSUP);
}
VTSessionSetProperty(s->transfer, kVTPixelTransferPropertyKey_DestinationYCbCrMatrix, value);
}
return 0;
}
static av_cold void scale_vt_uninit(AVFilterContext *avctx)
{
ScaleVtContext *s = avctx->priv;
if (s->transfer) {
VTPixelTransferSessionInvalidate(s->transfer);
CFRelease(s->transfer);
s->transfer = NULL;
}
}
static int scale_vt_filter_frame(AVFilterLink *link, AVFrame *in)
{
int ret;
AVFilterContext *ctx = link->dst;
ScaleVtContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
CVPixelBufferRef src;
CVPixelBufferRef dst;
AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
ret = AVERROR(ENOMEM);
goto fail;
}
ret = av_frame_copy_props(out, in);
if (ret < 0)
goto fail;
av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,
(int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
(int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
INT_MAX);
if (s->colour_primaries != AVCOL_PRI_UNSPECIFIED)
out->color_primaries = s->colour_primaries;
if (s->colour_transfer != AVCOL_TRC_UNSPECIFIED)
out->color_trc = s->colour_transfer;
if (s->colour_matrix != AVCOL_SPC_UNSPECIFIED)
out->colorspace = s->colour_matrix;
src = (CVPixelBufferRef)in->data[3];
dst = (CVPixelBufferRef)out->data[3];
ret = VTPixelTransferSessionTransferImage(s->transfer, src, dst);
if (ret != noErr) {
av_log(ctx, AV_LOG_ERROR, "transfer image failed, %d\n", ret);
ret = AVERROR_EXTERNAL;
goto fail;
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
fail:
av_frame_free(&in);
av_frame_free(&out);
return ret;
}
static int scale_vt_config_output(AVFilterLink *outlink)
{
int err;
AVFilterContext *avctx = outlink->src;
ScaleVtContext *s = avctx->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
err = ff_scale_eval_dimensions(s, s->w_expr, s->h_expr, inlink, outlink,
&s->output_width,
&s->output_height);
if (err < 0)
return err;
outlink->w = s->output_width;
outlink->h = s->output_height;
if (inlink->sample_aspect_ratio.num) {
AVRational r = {outlink->h * inlink->w, outlink->w * inlink->h};
outlink->sample_aspect_ratio = av_mul_q(r, inlink->sample_aspect_ratio);
} else {
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
}
return 0;
}
#define OFFSET(x) offsetof(ScaleVtContext, x)
#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
static const AVOption scale_vt_options[] = {
{ "w", "Output video width",
OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, .flags = FLAGS },
{ "h", "Output video height",
OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, .flags = FLAGS },
{ "color_matrix", "Output colour matrix coefficient set",
OFFSET(colour_matrix_string), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
{ "color_primaries", "Output colour primaries",
OFFSET(colour_primaries_string), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
{ "color_transfer", "Output colour transfer characteristics",
OFFSET(colour_transfer_string), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
{ NULL },
};
AVFILTER_DEFINE_CLASS(scale_vt);
static const AVFilterPad scale_vt_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = &scale_vt_filter_frame,
},
};
static const AVFilterPad scale_vt_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = &scale_vt_config_output,
},
};
const AVFilter ff_vf_scale_vt = {
.name = "scale_vt",
.description = NULL_IF_CONFIG_SMALL("Scale Videotoolbox frames"),
.priv_size = sizeof(ScaleVtContext),
.init = scale_vt_init,
.uninit = scale_vt_uninit,
FILTER_INPUTS(scale_vt_inputs),
FILTER_OUTPUTS(scale_vt_outputs),
FILTER_SINGLE_PIXFMT(AV_PIX_FMT_VIDEOTOOLBOX),
.priv_class = &scale_vt_class,
.flags = AVFILTER_FLAG_HWDEVICE,
};
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