On 5/31/19, Pavel Koshevoy <pkoshe...@gmail.com> wrote:
> On Fri, May 31, 2019 at 1:44 PM Pavel Koshevoy <pkoshe...@gmail.com> wrote:
>>
>>
>>
>>
>> On Fri, May 31, 2019 at 4:46 AM Paul B Mahol <one...@gmail.com> wrote:
>> >
>> > Signed-off-by: Paul B Mahol <one...@gmail.com>
>> > ---
>> > libavfilter/vf_zscale.c | 335 +++++++++++++++++++++++++---------------
>> > 1 file changed, 214 insertions(+), 121 deletions(-)
>> >
>> > diff --git a/libavfilter/vf_zscale.c b/libavfilter/vf_zscale.c
>> > index f0309272fa..c53bb08ccc 100644
>> > --- a/libavfilter/vf_zscale.c
>> > +++ b/libavfilter/vf_zscale.c
>> > @@ -74,6 +74,16 @@ enum var_name {
>> > VARS_NB
>> > };
>> >
>> > +typedef struct ZScaleThreadContext {
>> > + void *tmp;
>> > + size_t tmp_size;
>> > +
>> > + zimg_image_format src_format, dst_format;
>> > + zimg_image_format alpha_src_format, alpha_dst_format;
>> > + zimg_graph_builder_params alpha_params, params;
>> > + zimg_filter_graph *alpha_graph, *graph;
>> > +} ZScaleThreadContext;
>> > +
>> > typedef struct ZScaleContext {
>> > const AVClass *class;
>> >
>> > @@ -100,6 +110,8 @@ typedef struct ZScaleContext {
>> > double nominal_peak_luminance;
>> > int approximate_gamma;
>> >
>> > + int nb_threads;
>> > +
>> > char *w_expr; ///< width expression string
>> > char *h_expr; ///< height expression string
>> >
>> > @@ -110,13 +122,7 @@ typedef struct ZScaleContext {
>> >
>> > int force_original_aspect_ratio;
>> >
>> > - void *tmp;
>> > - size_t tmp_size;
>> > -
>> > - zimg_image_format src_format, dst_format;
>> > - zimg_image_format alpha_src_format, alpha_dst_format;
>> > - zimg_graph_builder_params alpha_params, params;
>> > - zimg_filter_graph *alpha_graph, *graph;
>> > + ZScaleThreadContext *ztd;
>> >
>> > enum AVColorSpace in_colorspace, out_colorspace;
>> > enum AVColorTransferCharacteristic in_trc, out_trc;
>> > @@ -204,6 +210,12 @@ static int config_props(AVFilterLink *outlink)
>> > int ret;
>> > int factor_w, factor_h;
>> >
>> > + s->nb_threads = ff_filter_get_nb_threads(ctx);
>> > + av_freep(&s->ztd);
>> > + s->ztd = av_calloc(s->nb_threads, sizeof(*s->ztd));
>> > + if (!s->ztd)
>> > + return AVERROR(ENOMEM);
>> > +
>> > var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
>> > var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
>> > var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
>> > @@ -458,10 +470,12 @@ static int convert_range(enum AVColorRange
>> > color_range)
>> > }
>> >
>> > static void format_init(zimg_image_format *format, AVFrame *frame,
>> > const AVPixFmtDescriptor *desc,
>> > - int colorspace, int primaries, int transfer,
>> > int range, int location)
>> > + int colorspace, int primaries, int transfer,
>> > int range, int location,
>> > + int width, int height,
>> > + double active_top, double active_height, int
>> > set_active)
>> > {
>> > - format->width = frame->width;
>> > - format->height = frame->height;
>> > + format->width = width;
>> > + format->height = height;
>> > format->subsample_w = desc->log2_chroma_w;
>> > format->subsample_h = desc->log2_chroma_h;
>> > format->depth = desc->comp[0].depth;
>> > @@ -472,6 +486,10 @@ static void format_init(zimg_image_format *format,
>> > AVFrame *frame, const AVPixFm
>> > format->transfer_characteristics = transfer == - 1 ?
>> > convert_trc(frame->color_trc) : transfer;
>> > format->pixel_range = (desc->flags & AV_PIX_FMT_FLAG_RGB) ?
>> > ZIMG_RANGE_FULL : range == -1 ? convert_range(frame->color_range) :
>> > range;
>> > format->chroma_location = location == -1 ?
>> > convert_chroma_location(frame->chroma_location) : location;
>> > + if (!set_active)
>> > + return;
>> > + format->active_region.top = active_top;
>> > + format->active_region.height = active_height;
>> > }
>> >
>> > static int graph_build(zimg_filter_graph **graph,
>> > zimg_graph_builder_params *params,
>> > @@ -502,16 +520,163 @@ static int graph_build(zimg_filter_graph **graph,
>> > zimg_graph_builder_params *par
>> > return 0;
>> > }
>> >
>> > +typedef struct ThreadData {
>> > + AVFrame *in, *out;
>> > + const AVPixFmtDescriptor *desc, *odesc;
>> > +} ThreadData;
>> > +
>> > +static int prepare_graph(AVFilterContext *ctx, void *arg, int jobnr,
>> > int nb_jobs)
>> > +{
>> > + ZScaleContext *s = ctx->priv;
>> > + ThreadData *td = arg;
>> > + AVFrame *in = td->in;
>> > + AVFrame *out = td->out;
>> > + const AVPixFmtDescriptor *desc = td->desc;
>> > + const AVPixFmtDescriptor *odesc = td->odesc;
>> > + const int in_slice_start = (in->height * jobnr) / nb_jobs;
>> > + const int in_slice_end = (in->height * (jobnr+1)) / nb_jobs;
>> > + const int out_slice_start = (out->height * jobnr) / nb_jobs;
>> > + const int out_slice_end = (out->height * (jobnr+1)) / nb_jobs;
>> > + const double scale_h = (double)in->height / (double)out->height;
>> > + double active_top = out_slice_start * scale_h;
>> > + double active_height = (out_slice_end - out_slice_start) * scale_h;
>> > + int ret;
>> > +
>> > + zimg_image_format_default(&s->ztd[jobnr].src_format,
>> > ZIMG_API_VERSION);
>> > + zimg_image_format_default(&s->ztd[jobnr].dst_format,
>> > ZIMG_API_VERSION);
>> > + zimg_graph_builder_params_default(&s->ztd[jobnr].params,
>> > ZIMG_API_VERSION);
>> > +
>> > + s->ztd[jobnr].params.dither_type = s->dither;
>> > + s->ztd[jobnr].params.cpu_type = ZIMG_CPU_AUTO;
>> > + s->ztd[jobnr].params.resample_filter = s->filter;
>> > + s->ztd[jobnr].params.resample_filter_uv = s->filter;
>> > + s->ztd[jobnr].params.nominal_peak_luminance =
>> > s->nominal_peak_luminance;
>> > + s->ztd[jobnr].params.allow_approximate_gamma =
>> > s->approximate_gamma;
>> > +
>> > + format_init(&s->ztd[jobnr].src_format, in, desc, s->colorspace_in,
>> > + s->primaries_in, s->trc_in, s->range_in, s->chromal_in,
>> > + in->width, in->height,
>> > + active_top, active_height, 1);
>> > + format_init(&s->ztd[jobnr].dst_format, out, odesc, s->colorspace,
>> > + s->primaries, s->trc, s->range, s->chromal,
>> > + out->width, out_slice_end - out_slice_start,
>> > + 0, 0, 0);
>> > +
>> > + ret = graph_build(&s->ztd[jobnr].graph, &s->ztd[jobnr].params,
>> > &s->ztd[jobnr].src_format, &s->ztd[jobnr].dst_format,
>> > + &s->ztd[jobnr].tmp, &s->ztd[jobnr].tmp_size);
>> > + if (ret)
>> > + return ret;
>> > +
>> > + if (desc->flags & AV_PIX_FMT_FLAG_ALPHA && odesc->flags &
>> > AV_PIX_FMT_FLAG_ALPHA) {
>> > + zimg_image_format_default(&s->ztd[jobnr].alpha_src_format,
>> > ZIMG_API_VERSION);
>> > + zimg_image_format_default(&s->ztd[jobnr].alpha_dst_format,
>> > ZIMG_API_VERSION);
>> > + zimg_graph_builder_params_default(&s->ztd[jobnr].alpha_params,
>> > ZIMG_API_VERSION);
>> > +
>> > + s->ztd[jobnr].alpha_params.dither_type = s->dither;
>> > + s->ztd[jobnr].alpha_params.cpu_type = ZIMG_CPU_AUTO;
>> > + s->ztd[jobnr].alpha_params.resample_filter = s->filter;
>> > +
>> > + s->ztd[jobnr].alpha_src_format.width = in->width;
>> > + s->ztd[jobnr].alpha_src_format.height = in->height;
>> > + s->ztd[jobnr].alpha_src_format.depth = desc->comp[0].depth;
>> > + s->ztd[jobnr].alpha_src_format.pixel_type = (desc->flags &
>> > AV_PIX_FMT_FLAG_FLOAT) ? ZIMG_PIXEL_FLOAT : desc->comp[0].depth > 8 ?
>> > ZIMG_PIXEL_WORD : ZIMG_PIXEL_BYTE;
>> > + s->ztd[jobnr].alpha_src_format.color_family = ZIMG_COLOR_GREY;
>> > + s->ztd[jobnr].alpha_src_format.active_region.left = 0;
>> > + s->ztd[jobnr].alpha_src_format.active_region.top =
>> > in_slice_start;
>> > + s->ztd[jobnr].alpha_src_format.active_region.width = in->width;
>> > + s->ztd[jobnr].alpha_src_format.active_region.height =
>> > in_slice_end - in_slice_start;
>> > +
>> > + s->ztd[jobnr].alpha_dst_format.width = out->width;
>> > + s->ztd[jobnr].alpha_dst_format.height = out->height;
>> > + s->ztd[jobnr].alpha_dst_format.depth = odesc->comp[0].depth;
>> > + s->ztd[jobnr].alpha_dst_format.pixel_type = (odesc->flags &
>> > AV_PIX_FMT_FLAG_FLOAT) ? ZIMG_PIXEL_FLOAT : odesc->comp[0].depth > 8 ?
>> > ZIMG_PIXEL_WORD : ZIMG_PIXEL_BYTE;
>> > + s->ztd[jobnr].alpha_dst_format.color_family = ZIMG_COLOR_GREY;
>> > +
>> > + zimg_filter_graph_free(s->ztd[jobnr].alpha_graph);
>> > + s->ztd[jobnr].alpha_graph =
>> > zimg_filter_graph_build(&s->ztd[jobnr].alpha_src_format,
>> > &s->ztd[jobnr].alpha_dst_format, &s->ztd[jobnr].alpha_params);
>> > + if (!s->ztd[jobnr].alpha_graph) {
>> > + return print_zimg_error(ctx);
>> > + }
>> > + }
>> > +
>> > + return 0;
>> > +}
>> > +
>> > +static int zscale_slice(AVFilterContext *ctx, void *arg, int jobnr, int
>> > nb_jobs)
>> > +{
>> > + ZScaleContext *s = ctx->priv;
>> > + ThreadData *td = arg;
>> > + AVFrame *in = td->in;
>> > + AVFrame *out = td->out;
>> > + const AVPixFmtDescriptor *desc = td->desc;
>> > + const AVPixFmtDescriptor *odesc = td->odesc;
>> > + zimg_image_buffer_const src_buf = { ZIMG_API_VERSION };
>> > + zimg_image_buffer dst_buf = { ZIMG_API_VERSION };
>> > + int ret = AVERROR(EINVAL);
>> > +
>> > + for (int plane = 0; plane < 3; plane++) {
>> > + const int height = plane > 0 ? AV_CEIL_RSHIFT(out->height,
>> > odesc->log2_chroma_h) : out->height;
>> > + const int out_slice_start = (height * jobnr) / nb_jobs;
>> > + int p = desc->comp[plane].plane;
>> > +
>> > + src_buf.plane[plane].data = in->data[p];
>> > + src_buf.plane[plane].stride = in->linesize[p];
>> > + src_buf.plane[plane].mask = -1;
>> > +
>> > + p = odesc->comp[plane].plane;
>> > + dst_buf.plane[plane].data = out->data[p] + out_slice_start *
>> > out->linesize[p];
>> > + dst_buf.plane[plane].stride = out->linesize[p];
>> > + dst_buf.plane[plane].mask = -1;
>> > + }
>> > +
>> > + if (s->ztd[jobnr].graph)
>> > + ret = zimg_filter_graph_process(s->ztd[jobnr].graph, &src_buf,
>> > &dst_buf, s->ztd[jobnr].tmp, 0, 0, 0, 0);
>> > + if (ret)
>> > + return print_zimg_error(ctx);
>> > +
>> > + if (desc->flags & AV_PIX_FMT_FLAG_ALPHA && odesc->flags &
>> > AV_PIX_FMT_FLAG_ALPHA) {
>> > + const int out_slice_start = (out->height * jobnr) / nb_jobs;
>> > +
>> > + src_buf.plane[0].data = in->data[3];
>> > + src_buf.plane[0].stride = in->linesize[3];
>> > + src_buf.plane[0].mask = -1;
>> > +
>> > + dst_buf.plane[0].data = out->data[3] + out_slice_start *
>> > out->linesize[3];
>> > + dst_buf.plane[0].stride = out->linesize[3];
>> > + dst_buf.plane[0].mask = -1;
>> > +
>> > + ret = zimg_filter_graph_process(s->ztd[jobnr].alpha_graph,
>> > &src_buf, &dst_buf, s->ztd[jobnr].tmp, 0, 0, 0, 0);
>> > + if (ret)
>> > + return print_zimg_error(ctx);
>> > + } else if (odesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
>> > + int x, y;
>> > +
>> > + if (odesc->flags & AV_PIX_FMT_FLAG_FLOAT) {
>> > + for (y = 0; y < out->height; y++) {
>> > + for (x = 0; x < out->width; x++) {
>> > + AV_WN32(out->data[3] + x * odesc->comp[3].step + y
>> > * out->linesize[3],
>> > + av_float2int(1.0f));
>> > + }
>> > + }
>> > + } else {
>> > + for (y = 0; y < out->height; y++)
>> > + memset(out->data[3] + y * out->linesize[3], 0xff,
>> > out->width);
>> > + }
>> > + }
>> > +
>> > + return 0;
>> > +}
>> > +
>> > static int filter_frame(AVFilterLink *link, AVFrame *in)
>> > {
>> > - ZScaleContext *s = link->dst->priv;
>> > - AVFilterLink *outlink = link->dst->outputs[0];
>> > + AVFilterContext *ctx = link->dst;
>> > + ZScaleContext *s = ctx->priv;
>> > + AVFilterLink *outlink = ctx->outputs[0];
>> > const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
>> > const AVPixFmtDescriptor *odesc =
>> > av_pix_fmt_desc_get(outlink->format);
>> > - zimg_image_buffer_const src_buf = { ZIMG_API_VERSION };
>> > - zimg_image_buffer dst_buf = { ZIMG_API_VERSION };
>> > char buf[32];
>> > - int ret = 0, plane;
>> > + int ret = 0;
>> > + ThreadData td;
>> > AVFrame *out;
>> >
>> > out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
>> > @@ -552,41 +717,28 @@ static int filter_frame(AVFilterLink *link,
>> > AVFrame *in)
>> > return ret;
>> > }
>> >
>> > - zimg_image_format_default(&s->src_format, ZIMG_API_VERSION);
>> > - zimg_image_format_default(&s->dst_format, ZIMG_API_VERSION);
>> > - zimg_graph_builder_params_default(&s->params,
>> > ZIMG_API_VERSION);
>> > -
>> > - s->params.dither_type = s->dither;
>> > - s->params.cpu_type = ZIMG_CPU_AUTO;
>> > - s->params.resample_filter = s->filter;
>> > - s->params.resample_filter_uv = s->filter;
>> > - s->params.nominal_peak_luminance = s->nominal_peak_luminance;
>> > - s->params.allow_approximate_gamma = s->approximate_gamma;
>> > -
>> > - format_init(&s->src_format, in, desc, s->colorspace_in,
>> > - s->primaries_in, s->trc_in, s->range_in,
>> > s->chromal_in);
>> > - format_init(&s->dst_format, out, odesc, s->colorspace,
>> > - s->primaries, s->trc, s->range, s->chromal);
>> > + td.out = out;
>> > + td.in = in;
>> > + td.desc = desc;
>> > + td.odesc = odesc;
>> > + ret = ctx->internal->execute(ctx, prepare_graph, &td, NULL,
>> > FFMIN3(in->height, out->height, s->nb_threads));
>> > + if (ret)
>> > + goto fail;
>> >
>> > if (s->colorspace != -1)
>> > - out->colorspace = (int)s->dst_format.matrix_coefficients;
>> > + out->colorspace =
>> > (int)s->ztd[0].dst_format.matrix_coefficients;
>> >
>> > if (s->primaries != -1)
>> > - out->color_primaries = (int)s->dst_format.color_primaries;
>> > + out->color_primaries =
>> > (int)s->ztd[0].dst_format.color_primaries;
>> >
>> > if (s->range != -1)
>> > - out->color_range = (int)s->dst_format.pixel_range + 1;
>> > + out->color_range = (int)s->ztd[0].dst_format.pixel_range +
>> > 1;
>> >
>> > if (s->trc != -1)
>> > - out->color_trc =
>> > (int)s->dst_format.transfer_characteristics;
>> > + out->color_trc =
>> > (int)s->ztd[0].dst_format.transfer_characteristics;
>> >
>> > if (s->chromal != -1)
>> > - out->chroma_location = (int)s->dst_format.chroma_location -
>> > 1;
>> > -
>> > - ret = graph_build(&s->graph, &s->params, &s->src_format,
>> > &s->dst_format,
>> > - &s->tmp, &s->tmp_size);
>> > - if (ret < 0)
>> > - goto fail;
>> > + out->chroma_location =
>> > (int)s->ztd[0].dst_format.chroma_location - 1;
>> >
>> > s->in_colorspace = in->colorspace;
>> > s->in_trc = in->color_trc;
>> > @@ -596,101 +748,38 @@ static int filter_frame(AVFilterLink *link,
>> > AVFrame *in)
>> > s->out_trc = out->color_trc;
>> > s->out_primaries = out->color_primaries;
>> > s->out_range = out->color_range;
>> > -
>> > - if (desc->flags & AV_PIX_FMT_FLAG_ALPHA && odesc->flags &
>> > AV_PIX_FMT_FLAG_ALPHA) {
>> > - zimg_image_format_default(&s->alpha_src_format,
>> > ZIMG_API_VERSION);
>> > - zimg_image_format_default(&s->alpha_dst_format,
>> > ZIMG_API_VERSION);
>> > - zimg_graph_builder_params_default(&s->alpha_params,
>> > ZIMG_API_VERSION);
>> > -
>> > - s->alpha_params.dither_type = s->dither;
>> > - s->alpha_params.cpu_type = ZIMG_CPU_AUTO;
>> > - s->alpha_params.resample_filter = s->filter;
>> > -
>> > - s->alpha_src_format.width = in->width;
>> > - s->alpha_src_format.height = in->height;
>> > - s->alpha_src_format.depth = desc->comp[0].depth;
>> > - s->alpha_src_format.pixel_type = (desc->flags &
>> > AV_PIX_FMT_FLAG_FLOAT) ? ZIMG_PIXEL_FLOAT : desc->comp[0].depth > 8 ?
>> > ZIMG_PIXEL_WORD : ZIMG_PIXEL_BYTE;
>> > - s->alpha_src_format.color_family = ZIMG_COLOR_GREY;
>> > -
>> > - s->alpha_dst_format.width = out->width;
>> > - s->alpha_dst_format.height = out->height;
>> > - s->alpha_dst_format.depth = odesc->comp[0].depth;
>> > - s->alpha_dst_format.pixel_type = (odesc->flags &
>> > AV_PIX_FMT_FLAG_FLOAT) ? ZIMG_PIXEL_FLOAT : odesc->comp[0].depth > 8 ?
>> > ZIMG_PIXEL_WORD : ZIMG_PIXEL_BYTE;
>> > - s->alpha_dst_format.color_family = ZIMG_COLOR_GREY;
>> > -
>> > - zimg_filter_graph_free(s->alpha_graph);
>> > - s->alpha_graph =
>> > zimg_filter_graph_build(&s->alpha_src_format, &s->alpha_dst_format,
>> > &s->alpha_params);
>> > - if (!s->alpha_graph) {
>> > - ret = print_zimg_error(link->dst);
>> > - goto fail;
>> > - }
>> > - }
>> > }
>> >
>> > if (s->colorspace != -1)
>> > - out->colorspace = (int)s->dst_format.matrix_coefficients;
>> > + out->colorspace =
>> > (int)s->ztd[0].dst_format.matrix_coefficients;
>> >
>> > if (s->primaries != -1)
>> > - out->color_primaries = (int)s->dst_format.color_primaries;
>> > + out->color_primaries =
>> > (int)s->ztd[0].dst_format.color_primaries;
>> >
>> > if (s->range != -1)
>> > - out->color_range = (int)s->dst_format.pixel_range;
>> > + out->color_range = (int)s->ztd[0].dst_format.pixel_range;
>> >
>> > if (s->trc != -1)
>> > - out->color_trc = (int)s->dst_format.transfer_characteristics;
>> > + out->color_trc =
>> > (int)s->ztd[0].dst_format.transfer_characteristics;
>> > +
>> > + if (s->chromal != -1)
>> > + out->chroma_location =
>> > (int)s->ztd[0].dst_format.chroma_location - 1;
>> >
>> > 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);
>> >
>> > - for (plane = 0; plane < 3; plane++) {
>> > - int p = desc->comp[plane].plane;
>> > - src_buf.plane[plane].data = in->data[p];
>> > - src_buf.plane[plane].stride = in->linesize[p];
>> > - src_buf.plane[plane].mask = -1;
>> > -
>> > - p = odesc->comp[plane].plane;
>> > - dst_buf.plane[plane].data = out->data[p];
>> > - dst_buf.plane[plane].stride = out->linesize[p];
>> > - dst_buf.plane[plane].mask = -1;
>> > - }
>> > -
>> > - ret = zimg_filter_graph_process(s->graph, &src_buf, &dst_buf,
>> > s->tmp, 0, 0, 0, 0);
>> > - if (ret) {
>> > - ret = print_zimg_error(link->dst);
>> > + if (!s->ztd[0].graph) {
>> > + ret = AVERROR(EINVAL);
>> > goto fail;
>> > }
>> >
>> > - if (desc->flags & AV_PIX_FMT_FLAG_ALPHA && odesc->flags &
>> > AV_PIX_FMT_FLAG_ALPHA) {
>> > - src_buf.plane[0].data = in->data[3];
>> > - src_buf.plane[0].stride = in->linesize[3];
>> > - src_buf.plane[0].mask = -1;
>> > -
>> > - dst_buf.plane[0].data = out->data[3];
>> > - dst_buf.plane[0].stride = out->linesize[3];
>> > - dst_buf.plane[0].mask = -1;
>> > -
>> > - ret = zimg_filter_graph_process(s->alpha_graph, &src_buf,
>> > &dst_buf, s->tmp, 0, 0, 0, 0);
>> > - if (ret) {
>> > - ret = print_zimg_error(link->dst);
>> > - goto fail;
>> > - }
>> > - } else if (odesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
>> > - int x, y;
>> > -
>> > - if (odesc->flags & AV_PIX_FMT_FLAG_FLOAT) {
>> > - for (y = 0; y < out->height; y++) {
>> > - for (x = 0; x < out->width; x++) {
>> > - AV_WN32(out->data[3] + x * odesc->comp[3].step + y
>> > * out->linesize[3],
>> > - av_float2int(1.0f));
>> > - }
>> > - }
>> > - } else {
>> > - for (y = 0; y < outlink->h; y++)
>> > - memset(out->data[3] + y * out->linesize[3], 0xff,
>> > outlink->w);
>> > - }
>> > - }
>> > + td.out = out;
>> > + td.in = in;
>> > + td.desc = desc;
>> > + td.odesc = odesc;
>> > + ret = ctx->internal->execute(ctx, zscale_slice, &td, NULL,
>> > FFMIN3(in->height, out->height, s->nb_threads));
>> >
>> > fail:
>> > av_frame_free(&in);
>> > @@ -706,10 +795,13 @@ static void uninit(AVFilterContext *ctx)
>> > {
>> > ZScaleContext *s = ctx->priv;
>> >
>> > - zimg_filter_graph_free(s->graph);
>> > - zimg_filter_graph_free(s->alpha_graph);
>> > - av_freep(&s->tmp);
>> > - s->tmp_size = 0;
>> > + for (int i = 0; i < s->nb_threads; i++) {
>> > + zimg_filter_graph_free(s->ztd[i].graph);
>> > + zimg_filter_graph_free(s->ztd[i].alpha_graph);
>> > + av_freep(&s->ztd[i].tmp);
>> > + s->ztd[i].tmp_size = 0;
>> > + }
>> > + av_freep(&s->ztd);
>> > }
>> >
>> > static int process_command(AVFilterContext *ctx, const char *cmd, const
>> > char *args,
>> > @@ -890,4 +982,5 @@ AVFilter ff_vf_zscale = {
>> > .inputs = avfilter_vf_zscale_inputs,
>> > .outputs = avfilter_vf_zscale_outputs,
>> > .process_command = process_command,
>> > + .flags = AVFILTER_FLAG_SLICE_THREADS,
>> > };
>> > --
>> > 2.17.1
>>
>>
>> I've had to use zscale to convert 10-bit 4k60p video from HLG HDR to SDR
>> (bt709). It was ~36x times slower than real time. What I ended up doing
>> to speed it up was to generate CLUT image (16-bit yuv444 65x65x65 sampling
>> of input color space), lay it out as a 2D image (512x537), and run it
>> through zscale to generate the HDR->SDR transform CLUT. Then I used the
>> CLUT instead of zscale for every frame... that got me to about ~3.5x
>> times slower than realtime converting 60fps 10-bit 4k HLG to SDR (and I
>> don't know any assembly, so I didn't attempt to optimize the CLUT
>> trilinear optimization with SIMD, so maybe it could be faster still). I
>> then ported to CUDA and was able to convert 4k60p HLG->SDR faster than
>> realtime on a Pascal GPU.
>>
>
> I meant trilinear interpolation
>
>
>> So, I'm not sure that adding slice threading to zscale is the best
>> optimization for it. I think capturing the effect of zscale in a CLUT
>> would be a more significant optimization.
>>
>> Just my 2 cents, hope this helps.
Your logic is completely flawed.
You can not rescale images with LUT tables.
>>
>> Pavel.
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