@@ -27,6 +27,7 @@ version <next>:

 - hdcd filter

 - readvitc filter

 - VAAPI-accelerated format conversion and scaling

+- libnpp/CUDA-accelerated format conversion and scaling

 version 3.0:

 - Common Encryption (CENC) MP4 encoding and decoding support

@@ -234,6 +234,7 @@ External library support:

   --enable-libmp3lame      enable MP3 encoding via libmp3lame [no]

   --enable-libnut          enable NUT (de)muxing via libnut,

                            native (de)muxer exists [no]

+  --enable-libnpp          enable NVIDIA Performance Primitives-based code [no]

   --enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no]

   --enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]

   --enable-libopencv       enable video filtering via libopencv [no]

@@ -1482,6 +1483,7 @@ EXTERNAL_LIBRARY_LIST="

     libmodplug

     libmp3lame

     libnut

+    libnpp

     libopencore_amrnb

     libopencore_amrwb

     libopencv

@@ -3002,6 +3004,7 @@ vidstabtransform_filter_deps="libvidstab"

 zmq_filter_deps="libzmq"

 zoompan_filter_deps="swscale"

 zscale_filter_deps="libzimg"

+scale_npp_filter_deps="cuda libnpp"

 scale_vaapi_filter_deps="vaapi VAProcPipelineParameterBuffer"

 # examples

@@ -4959,6 +4962,7 @@ die_license_disabled gpl x11grab

 die_license_disabled nonfree cuda

 die_license_disabled nonfree libfaac

+die_license_disabled nonfree libnpp

 die_license_disabled nonfree nvenc

 enabled gpl && die_license_disabled_gpl nonfree libfdk_aac

 enabled gpl && die_license_disabled_gpl nonfree openssl

@@ -5567,6 +5571,7 @@ enabled libmfx            && require_pkg_config libmfx "mfx/mfxvideo.h" MFXInit

 enabled libmodplug        && require_pkg_config libmodplug libmodplug/modplug.h ModPlug_Load

 enabled libmp3lame        && require "libmp3lame >= 3.98.3" lame/lame.h lame_set_VBR_quality -lmp3lame

 enabled libnut            && require libnut libnut.h nut_demuxer_init -lnut

+enabled libnpp            && require libnpp npp.h nppGetLibVersion -lnppi -lnppc

 enabled libopencore_amrnb && require libopencore_amrnb opencore-amrnb/interf_dec.h Decoder_Interface_init -lopencore-amrnb

 enabled libopencore_amrwb && require libopencore_amrwb opencore-amrwb/dec_if.h D_IF_init -lopencore-amrwb

 enabled libopencv         && { check_header opencv2/core/core_c.h &&

@@ -3395,6 +3395,47 @@ channels. Default is 0.3.

 Set level of input signal of original channel. Default is 0.8.

 @end table

+@section scale_npp

+

+Use the NVIDIA Performance Primitives (libnpp) to perform scaling and/or pixel

+format conversion on CUDA video frames. Setting the output width and height

+works in the same way as for the @var{scale} filter.

+

+The following additional options are accepted:

+@table @option

+@item format

+The pixel format of the output CUDA frames. If set to the string "same" (the

+default), the input format will be kept. Note that automatic format negotiation

+and conversion is not yet supported for hardware frames

+

+@item interp_algo

+The interpolation algorithm used for resizing. One of the following:

+@table @option

+@item nn

+Nearest neighbour.

+

+@item linear

+@item cubic

+@item cubic2p_bspline

+2-parameter cubic (B=1, C=0)

+

+@item cubic2p_catmullrom

+2-parameter cubic (B=0, C=1/2)

+

+@item cubic2p_b05c03

+2-parameter cubic (B=1/2, C=3/10)

+

+@item super

+Supersampling

+

+@item lanczos

+@end table

+

+@end table

+

+@section select

+Select frames to pass in output.

+

 @section treble

 Boost or cut treble (upper) frequencies of the audio using a two-pole

@@ -242,6 +242,7 @@ OBJS-$(CONFIG_SCALE2REF_FILTER)              += vf_scale.o

 OBJS-$(CONFIG_SELECT_FILTER)                 += f_select.o

 OBJS-$(CONFIG_SELECTIVECOLOR_FILTER)         += vf_selectivecolor.o

 OBJS-$(CONFIG_SENDCMD_FILTER)                += f_sendcmd.o

+OBJS-$(CONFIG_SCALE_NPP_FILTER)              += vf_scale_npp.o

 OBJS-$(CONFIG_SCALE_VAAPI_FILTER)            += vf_scale_vaapi.o

 OBJS-$(CONFIG_SETDAR_FILTER)                 += vf_aspect.o

 OBJS-$(CONFIG_SETFIELD_FILTER)               += vf_setfield.o

@@ -258,6 +258,7 @@ void avfilter_register_all(void)

     REGISTER_FILTER(SAB,            sab,            vf);

     REGISTER_FILTER(SCALE,          scale,          vf);

     REGISTER_FILTER(SCALE2REF,      scale2ref,      vf);

+    REGISTER_FILTER(SCALE_NPP,      scale_npp,      vf);

     REGISTER_FILTER(SCALE_VAAPI,    scale_vaapi,    vf);

     REGISTER_FILTER(SELECT,         select,         vf);

     REGISTER_FILTER(SELECTIVECOLOR, selectivecolor, vf);

@@ -30,8 +30,8 @@

 #include "libavutil/version.h"

 #define LIBAVFILTER_VERSION_MAJOR   6

-#define LIBAVFILTER_VERSION_MINOR  43

-#define LIBAVFILTER_VERSION_MICRO 101

+#define LIBAVFILTER_VERSION_MINOR  44

+#define LIBAVFILTER_VERSION_MICRO 100

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

                                                LIBAVFILTER_VERSION_MINOR, \

new file mode 100644

@@ -0,0 +1,660 @@

+/*

+ * 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

+ */

+

+/**

+ * @file

+ * scale video filter

+ */

+

+#include <nppi.h>

+#include <stdio.h>

+#include <string.h>

+

+#include "libavutil/avstring.h"

+#include "libavutil/common.h"

+#include "libavutil/eval.h"

+#include "libavutil/hwcontext.h"

+#include "libavutil/hwcontext_cuda.h"

+#include "libavutil/internal.h"

+#include "libavutil/mathematics.h"

+#include "libavutil/opt.h"

+#include "libavutil/pixdesc.h"

+

+#include "avfilter.h"

+#include "formats.h"

+#include "internal.h"

+#include "video.h"

+

+static const enum AVPixelFormat supported_formats[] = {

+    AV_PIX_FMT_YUV420P,

+    AV_PIX_FMT_NV12,

+    AV_PIX_FMT_YUV444P,

+};

+

+static const enum AVPixelFormat deinterleaved_formats[][2] = {

+    { AV_PIX_FMT_NV12, AV_PIX_FMT_YUV420P },

+};

+

+static const char *const var_names[] = {

+    "PI",

+    "PHI",

+    "E",

+    "in_w",   "iw",

+    "in_h",   "ih",

+    "out_w",  "ow",

+    "out_h",  "oh",

+    "a", "dar",

+    "sar",

+    NULL

+};

+

+enum var_name {

+    VAR_PI,

+    VAR_PHI,

+    VAR_E,

+    VAR_IN_W,   VAR_IW,

+    VAR_IN_H,   VAR_IH,

+    VAR_OUT_W,  VAR_OW,

+    VAR_OUT_H,  VAR_OH,

+    VAR_A, VAR_DAR,

+    VAR_SAR,

+    VARS_NB

+};

+

+enum ScaleStage {

+    STAGE_DEINTERLEAVE,

+    STAGE_RESIZE,

+    STAGE_INTERLEAVE,

+    STAGE_NB,

+};

+

+typedef struct NPPScaleStageContext {

+    int stage_needed;

+    enum AVPixelFormat in_fmt;

+    enum AVPixelFormat out_fmt;

+

+    struct {

+        int width;

+        int height;

+    } planes_in[3], planes_out[3];

+

+    AVBufferRef *frames_ctx;

+    AVFrame     *frame;

+} NPPScaleStageContext;

+

+typedef struct NPPScaleContext {

+    const AVClass *class;

+

+    NPPScaleStageContext stages[STAGE_NB];

+    AVFrame *tmp_frame;

+    int passthrough;

+

+    int shift_width, shift_height;

+

+    /**

+     * New dimensions. Special values are:

+     *   0 = original width/height

+     *  -1 = keep original aspect

+     */

+    int w, h;

+

+    /**

+     * Output sw format. AV_PIX_FMT_NONE for no conversion.

+     */

+    enum AVPixelFormat format;

+

+    char *w_expr;               ///< width  expression string

+    char *h_expr;               ///< height expression string

+    char *format_str;

+

+    int interp_algo;

+} NPPScaleContext;

+

+static int nppscale_init(AVFilterContext *ctx)

+{

+    NPPScaleContext *s = ctx->priv;

+    int i;

+

+    if (!strcmp(s->format_str, "same")) {

+        s->format = AV_PIX_FMT_NONE;

+    } else {

+        s->format = av_get_pix_fmt(s->format_str);

+        if (s->format == AV_PIX_FMT_NONE) {

+            av_log(ctx, AV_LOG_ERROR, "Unrecognized pixel format: %s\n", s->format_str);

+            return AVERROR(EINVAL);

+        }

+    }

+

+    for (i = 0; i < FF_ARRAY_ELEMS(s->stages); i++) {

+        s->stages[i].frame = av_frame_alloc();

+        if (!s->stages[i].frame)

+            return AVERROR(ENOMEM);

+    }

+    s->tmp_frame = av_frame_alloc();

+    if (!s->tmp_frame)

+        return AVERROR(ENOMEM);

+

+    return 0;

+}

+

+static void nppscale_uninit(AVFilterContext *ctx)

+{

+    NPPScaleContext *s = ctx->priv;

+    int i;

+

+    for (i = 0; i < FF_ARRAY_ELEMS(s->stages); i++) {

+        av_frame_free(&s->stages[i].frame);

+        av_buffer_unref(&s->stages[i].frames_ctx);

+    }

+    av_frame_free(&s->tmp_frame);

+}

+

+static int nppscale_query_formats(AVFilterContext *ctx)

+{

+    static const enum AVPixelFormat pixel_formats[] = {

+        AV_PIX_FMT_CUDA, AV_PIX_FMT_NONE,

+    };

+    AVFilterFormats *pix_fmts  = ff_make_format_list(pixel_formats);

+

+    ff_set_common_formats(ctx, pix_fmts);

+

+    return 0;

+}

+

+static int init_stage(NPPScaleStageContext *stage, AVBufferRef *device_ctx)

+{

+    AVBufferRef *out_ref = NULL;

+    AVHWFramesContext *out_ctx;

+    int in_sw, in_sh, out_sw, out_sh;

+    int ret, i;

+

+    av_pix_fmt_get_chroma_sub_sample(stage->in_fmt,  &in_sw,  &in_sh);

+    av_pix_fmt_get_chroma_sub_sample(stage->out_fmt, &out_sw, &out_sh);

+    if (!stage->planes_out[0].width) {

+        stage->planes_out[0].width  = stage->planes_in[0].width;

+        stage->planes_out[0].height = stage->planes_in[0].height;

+    }

+

+    for (i = 1; i < FF_ARRAY_ELEMS(stage->planes_in); i++) {

+        stage->planes_in[i].width   = stage->planes_in[0].width   >> in_sw;

+        stage->planes_in[i].height  = stage->planes_in[0].height  >> in_sh;

+        stage->planes_out[i].width  = stage->planes_out[0].width  >> out_sw;

+        stage->planes_out[i].height = stage->planes_out[0].height >> out_sh;

+    }

+

+    out_ref = av_hwframe_ctx_alloc(device_ctx);

+    if (!out_ref)

+        return AVERROR(ENOMEM);

+    out_ctx = (AVHWFramesContext*)out_ref->data;

+

+    out_ctx->format    = AV_PIX_FMT_CUDA;

+    out_ctx->sw_format = stage->out_fmt;

+    out_ctx->width     = FFALIGN(stage->planes_out[0].width,  32);

+    out_ctx->height    = FFALIGN(stage->planes_out[0].height, 32);

+

+    ret = av_hwframe_ctx_init(out_ref);

+    if (ret < 0)

+        goto fail;

+

+    av_frame_unref(stage->frame);

+    ret = av_hwframe_get_buffer(out_ref, stage->frame, 0);

+    if (ret < 0)

+        goto fail;

+

+    stage->frame->width  = stage->planes_out[0].width;

+    stage->frame->height = stage->planes_out[0].height;

+

+    av_buffer_unref(&stage->frames_ctx);

+    stage->frames_ctx = out_ref;

+

+    return 0;

+fail:

+    av_buffer_unref(&out_ref);

+    return ret;

+}

+

+static int format_is_supported(enum AVPixelFormat fmt)

+{

+    int i;

+

+    for (i = 0; i < FF_ARRAY_ELEMS(supported_formats); i++)

+        if (supported_formats[i] == fmt)

+            return 1;

+    return 0;

+}

+

+static enum AVPixelFormat get_deinterleaved_format(enum AVPixelFormat fmt)

+{

+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);

+    int i, planes;

+

+    planes = av_pix_fmt_count_planes(fmt);

+    if (planes == desc->nb_components)

+        return fmt;

+    for (i = 0; i < FF_ARRAY_ELEMS(deinterleaved_formats); i++)

+        if (deinterleaved_formats[i][0] == fmt)

+            return deinterleaved_formats[i][1];

+    return AV_PIX_FMT_NONE;

+}

+

+static int init_processing_chain(AVFilterContext *ctx, int in_width, int in_height,

+                                 int out_width, int out_height)

+{

+    NPPScaleContext *s = ctx->priv;

+

+    AVHWFramesContext *in_frames_ctx;

+

+    enum AVPixelFormat in_format;

+    enum AVPixelFormat out_format;

+    enum AVPixelFormat in_deinterleaved_format;

+    enum AVPixelFormat out_deinterleaved_format;

+

+    int i, ret, last_stage = -1;

+

+    /* check that we have a hw context */

+    if (!ctx->inputs[0]->hw_frames_ctx) {

+        av_log(ctx, AV_LOG_ERROR, "No hw context provided on input\n");

+        return AVERROR(EINVAL);

+    }

+    in_frames_ctx = (AVHWFramesContext*)ctx->inputs[0]->hw_frames_ctx->data;

+    in_format     = in_frames_ctx->sw_format;

+    out_format    = (s->format == AV_PIX_FMT_NONE) ? in_format : s->format;

+

+    if (!format_is_supported(in_format)) {

+        av_log(ctx, AV_LOG_ERROR, "Unsupported input format: %s\n",

+               av_get_pix_fmt_name(in_format));

+        return AVERROR(ENOSYS);

+    }

+    if (!format_is_supported(out_format)) {

+        av_log(ctx, AV_LOG_ERROR, "Unsupported output format: %s\n",

+               av_get_pix_fmt_name(out_format));

+        return AVERROR(ENOSYS);

+    }

+

+    in_deinterleaved_format  = get_deinterleaved_format(in_format);

+    out_deinterleaved_format = get_deinterleaved_format(out_format);

+    if (in_deinterleaved_format  == AV_PIX_FMT_NONE ||

+        out_deinterleaved_format == AV_PIX_FMT_NONE)

+        return AVERROR_BUG;

+

+    /* figure out which stages need to be done */

+    if (in_width != out_width || in_height != out_height ||

+        in_deinterleaved_format != out_deinterleaved_format)

+        s->stages[STAGE_RESIZE].stage_needed = 1;

+

+    if (!s->stages[STAGE_RESIZE].stage_needed && in_format == out_format)

+        s->passthrough = 1;

+

+    if (!s->passthrough) {

+        if (in_format != in_deinterleaved_format)

+            s->stages[STAGE_DEINTERLEAVE].stage_needed = 1;

+        if (out_format != out_deinterleaved_format)

+            s->stages[STAGE_INTERLEAVE].stage_needed = 1;

+    }

+

+    s->stages[STAGE_DEINTERLEAVE].in_fmt              = in_format;

+    s->stages[STAGE_DEINTERLEAVE].out_fmt             = in_deinterleaved_format;

+    s->stages[STAGE_DEINTERLEAVE].planes_in[0].width  = in_width;

+    s->stages[STAGE_DEINTERLEAVE].planes_in[0].height = in_height;

+

+    s->stages[STAGE_RESIZE].in_fmt               = in_deinterleaved_format;

+    s->stages[STAGE_RESIZE].out_fmt              = out_deinterleaved_format;

+    s->stages[STAGE_RESIZE].planes_in[0].width   = in_width;

+    s->stages[STAGE_RESIZE].planes_in[0].height  = in_height;

+    s->stages[STAGE_RESIZE].planes_out[0].width  = out_width;

+    s->stages[STAGE_RESIZE].planes_out[0].height = out_height;

+

+    s->stages[STAGE_INTERLEAVE].in_fmt              = out_deinterleaved_format;

+    s->stages[STAGE_INTERLEAVE].out_fmt             = out_format;

+    s->stages[STAGE_INTERLEAVE].planes_in[0].width  = out_width;

+    s->stages[STAGE_INTERLEAVE].planes_in[0].height = out_height;

+

+    /* init the hardware contexts */

+    for (i = 0; i < FF_ARRAY_ELEMS(s->stages); i++) {

+        if (!s->stages[i].stage_needed)

+            continue;

+

+        ret = init_stage(&s->stages[i], in_frames_ctx->device_ref);

+        if (ret < 0)

+            return ret;

+

+        last_stage = i;

+    }

+

+    if (last_stage < 0)

+        return AVERROR_BUG;

+    ctx->outputs[0]->hw_frames_ctx = av_buffer_ref(s->stages[last_stage].frames_ctx);

+    if (!ctx->outputs[0]->hw_frames_ctx)

+        return AVERROR(ENOMEM);

+

+    return 0;

+}

+

+static int nppscale_config_props(AVFilterLink *outlink)

+{

+    AVFilterContext *ctx = outlink->src;

+    AVFilterLink *inlink = outlink->src->inputs[0];

+    NPPScaleContext  *s = ctx->priv;

+    int64_t w, h;

+    double var_values[VARS_NB], res;

+    char *expr;

+    int ret;

+

+    var_values[VAR_PI]    = M_PI;

+    var_values[VAR_PHI]   = M_PHI;

+    var_values[VAR_E]     = M_E;

+    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;

+    var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;

+    var_values[VAR_A]     = (double) inlink->w / inlink->h;

+    var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ?

+        (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;

+    var_values[VAR_DAR]   = var_values[VAR_A] * var_values[VAR_SAR];

+

+    /* evaluate width and height */

+    av_expr_parse_and_eval(&res, (expr = s->w_expr),

+                           var_names, var_values,

+                           NULL, NULL, NULL, NULL, NULL, 0, ctx);

+    s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;

+    if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),

+                                      var_names, var_values,

+                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

+        goto fail;

+    s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;

+    /* evaluate again the width, as it may depend on the output height */

+    if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),

+                                      var_names, var_values,

+                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

+        goto fail;

+    s->w = res;

+

+    w = s->w;

+    h = s->h;

+

+    /* sanity check params */

+    if (w <  -1 || h <  -1) {

+        av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");

+        return AVERROR(EINVAL);

+    }

+    if (w == -1 && h == -1)

+        s->w = s->h = 0;

+

+    if (!(w = s->w))

+        w = inlink->w;

+    if (!(h = s->h))

+        h = inlink->h;

+    if (w == -1)

+        w = av_rescale(h, inlink->w, inlink->h);

+    if (h == -1)

+        h = av_rescale(w, inlink->h, inlink->w);

+

+    if (w > INT_MAX || h > INT_MAX ||

+        (h * inlink->w) > INT_MAX  ||

+        (w * inlink->h) > INT_MAX)

+        av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");

+

+    outlink->w = w;

+    outlink->h = h;

+

+    ret = init_processing_chain(ctx, inlink->w, inlink->h, w, h);

+    if (ret < 0)

+        return ret;

+

+    av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d\n",

+           inlink->w, inlink->h, outlink->w, outlink->h);

+

+    if (inlink->sample_aspect_ratio.num)

+        outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h*inlink->w,

+                                                             outlink->w*inlink->h},

+                                                inlink->sample_aspect_ratio);

+    else

+        outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

+

+    return 0;

+

+fail:

+    av_log(NULL, AV_LOG_ERROR,

+           "Error when evaluating the expression '%s'\n", expr);

+    return ret;

+}

+

+static int nppscale_deinterleave(AVFilterContext *ctx, NPPScaleStageContext *stage,

+                                 AVFrame *out, AVFrame *in)

+{

+    AVHWFramesContext *in_frames_ctx = (AVHWFramesContext*)in->hw_frames_ctx->data;

+    NppStatus err;

+

+    switch (in_frames_ctx->sw_format) {

+    case AV_PIX_FMT_NV12:

+        err = nppiYCbCr420_8u_P2P3R(in->data[0], in->linesize[0],

+                                    in->data[1], in->linesize[1],

+                                    out->data, out->linesize,

+                                    (NppiSize){ in->width, in->height });

+        break;

+    default:

+        return AVERROR_BUG;

+    }

+    if (err != NPP_SUCCESS) {

+        av_log(ctx, AV_LOG_ERROR, "NPP deinterleave error: %d\n", err);

+        return AVERROR_UNKNOWN;

+    }

+

+    return 0;

+}

+

+static int nppscale_resize(AVFilterContext *ctx, NPPScaleStageContext *stage,

+                           AVFrame *out, AVFrame *in)

+{

+    NPPScaleContext *s = ctx->priv;

+    NppStatus err;

+    int i;

+

+    for (i = 0; i < FF_ARRAY_ELEMS(in->data) && in->data[i]; i++) {

+        int iw = stage->planes_in[i].width;

+        int ih = stage->planes_in[i].height;

+        int ow = stage->planes_out[i].width;

+        int oh = stage->planes_out[i].height;

+

+        err = nppiResizeSqrPixel_8u_C1R(in->data[i], (NppiSize){ iw, ih },

+                                        in->linesize[i], (NppiRect){ 0, 0, iw, ih },

+                                        out->data[i], out->linesize[i],

+                                        (NppiRect){ 0, 0, ow, oh },

+                                        (double)ow / iw, (double)oh / ih,

+                                        0.0, 0.0, s->interp_algo);

+        if (err != NPP_SUCCESS) {

+            av_log(ctx, AV_LOG_ERROR, "NPP resize error: %d\n", err);

+            return AVERROR_UNKNOWN;

+        }

+    }

+

+    return 0;

+}

+

+static int nppscale_interleave(AVFilterContext *ctx, NPPScaleStageContext *stage,

+                               AVFrame *out, AVFrame *in)

+{

+    AVHWFramesContext *out_frames_ctx = (AVHWFramesContext*)out->hw_frames_ctx->data;

+    NppStatus err;

+

+    switch (out_frames_ctx->sw_format) {

+    case AV_PIX_FMT_NV12:

+        err = nppiYCbCr420_8u_P3P2R((const uint8_t**)in->data,

+                                    in->linesize,

+                                    out->data[0], out->linesize[0],

+                                    out->data[1], out->linesize[1],

+                                    (NppiSize){ in->width, in->height });

+        break;

+    default:

+        return AVERROR_BUG;

+    }

+    if (err != NPP_SUCCESS) {

+        av_log(ctx, AV_LOG_ERROR, "NPP deinterleave error: %d\n", err);

+        return AVERROR_UNKNOWN;

+    }

+

+    return 0;

+}

+

+static int (*const nppscale_process[])(AVFilterContext *ctx, NPPScaleStageContext *stage,

+                                       AVFrame *out, AVFrame *in) = {

+    [STAGE_DEINTERLEAVE] = nppscale_deinterleave,

+    [STAGE_RESIZE]       = nppscale_resize,

+    [STAGE_INTERLEAVE]   = nppscale_interleave,

+};

+

+static int nppscale_scale(AVFilterContext *ctx, AVFrame *out, AVFrame *in)

+{

+    NPPScaleContext *s = ctx->priv;

+    AVFrame *src = in;

+    int i, ret, last_stage = -1;

+

+    for (i = 0; i < FF_ARRAY_ELEMS(s->stages); i++) {

+        if (!s->stages[i].stage_needed)

+            continue;

+

+        ret = nppscale_process[i](ctx, &s->stages[i], s->stages[i].frame, src);

+        if (ret < 0)

+            return ret;

+

+        src        = s->stages[i].frame;

+        last_stage = i;

+    }

+

+    if (last_stage < 0)

+        return AVERROR_BUG;

+    ret = av_hwframe_get_buffer(src->hw_frames_ctx, s->tmp_frame, 0);

+    if (ret < 0)

+        return ret;

+

+    av_frame_move_ref(out, src);

+    av_frame_move_ref(src, s->tmp_frame);

+

+    ret = av_frame_copy_props(out, in);

+    if (ret < 0)

+        return ret;

+

+    return 0;

+}

+

+static int nppscale_filter_frame(AVFilterLink *link, AVFrame *in)

+{

+    AVFilterContext              *ctx = link->dst;

+    NPPScaleContext                *s = ctx->priv;

+    AVFilterLink             *outlink = ctx->outputs[0];

+    AVHWFramesContext     *frames_ctx = (AVHWFramesContext*)outlink->hw_frames_ctx->data;

+    AVCUDADeviceContext *device_hwctx = frames_ctx->device_ctx->hwctx;

+

+    AVFrame *out = NULL;

+    CUresult err;

+    CUcontext dummy;

+    int ret = 0;

+

+    if (s->passthrough)

+        return ff_filter_frame(outlink, in);

+

+    out = av_frame_alloc();

+    if (!out) {

+        ret = AVERROR(ENOMEM);

+        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);

+

+    err = cuCtxPushCurrent(device_hwctx->cuda_ctx);

+    if (err != CUDA_SUCCESS) {

+        ret = AVERROR_UNKNOWN;

+        goto fail;

+    }

+

+    ret = nppscale_scale(ctx, out, in);

+

+    cuCtxPopCurrent(&dummy);

+    if (ret < 0)

+        goto fail;

+

+    av_frame_free(&in);

+    return ff_filter_frame(outlink, out);

+fail:

+    av_frame_free(&in);

+    av_frame_free(&out);

+    return ret;

+}

+

+#define OFFSET(x) offsetof(NPPScaleContext, x)

+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM

+static const AVOption 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 },

+    { "format", "Output pixel format", OFFSET(format_str), AV_OPT_TYPE_STRING, { .str = "same" }, .flags = FLAGS },

+

+    { "interp_algo", "Interpolation algorithm used for resizing", OFFSET(interp_algo), AV_OPT_TYPE_INT, { .i64 = NPPI_INTER_CUBIC }, 0, INT_MAX, FLAGS, "interp_algo" },

+        { "nn",                 "nearest neighbour",                 0, AV_OPT_TYPE_CONST, { .i64 = NPPI_INTER_NN                 }, 0, 0, FLAGS, "interp_algo" },

+        { "linear",             "linear",                            0, AV_OPT_TYPE_CONST, { .i64 = NPPI_INTER_LINEAR             }, 0, 0, FLAGS, "interp_algo" },

+        { "cubic",              "cubic",                             0, AV_OPT_TYPE_CONST, { .i64 = NPPI_INTER_CUBIC              }, 0, 0, FLAGS, "interp_algo" },

+        { "cubic2p_bspline",    "2-parameter cubic (B=1, C=0)",      0, AV_OPT_TYPE_CONST, { .i64 = NPPI_INTER_CUBIC2P_BSPLINE    }, 0, 0, FLAGS, "interp_algo" },

+        { "cubic2p_catmullrom", "2-parameter cubic (B=0, C=1/2)",    0, AV_OPT_TYPE_CONST, { .i64 = NPPI_INTER_CUBIC2P_CATMULLROM }, 0, 0, FLAGS, "interp_algo" },

+        { "cubic2p_b05c03",     "2-parameter cubic (B=1/2, C=3/10)", 0, AV_OPT_TYPE_CONST, { .i64 = NPPI_INTER_CUBIC2P_B05C03     }, 0, 0, FLAGS, "interp_algo" },

+        { "super",              "supersampling",                     0, AV_OPT_TYPE_CONST, { .i64 = NPPI_INTER_SUPER              }, 0, 0, FLAGS, "interp_algo" },

+        { "lanczos",            "Lanczos",                           0, AV_OPT_TYPE_CONST, { .i64 = NPPI_INTER_LANCZOS            }, 0, 0, FLAGS, "interp_algo" },

+    { NULL },

+};

+

+static const AVClass nppscale_class = {

+    .class_name = "nppscale",

+    .item_name  = av_default_item_name,

+    .option     = options,

+    .version    = LIBAVUTIL_VERSION_INT,

+};

+

+static const AVFilterPad nppscale_inputs[] = {

+    {

+        .name        = "default",

+        .type        = AVMEDIA_TYPE_VIDEO,

+        .filter_frame = nppscale_filter_frame,

+    },

+    { NULL }

+};

+

+static const AVFilterPad nppscale_outputs[] = {

+    {

+        .name         = "default",

+        .type         = AVMEDIA_TYPE_VIDEO,

+        .config_props = nppscale_config_props,

+    },

+    { NULL }

+};

+

+AVFilter ff_vf_scale_npp = {

+    .name      = "scale_npp",

+    .description = NULL_IF_CONFIG_SMALL("NVIDIA Performance Primitives video "

+                                        "scaling and format conversion"),

+

+    .init          = nppscale_init,

+    .uninit        = nppscale_uninit,

+    .query_formats = nppscale_query_formats,

+

+    .priv_size = sizeof(NPPScaleContext),

+    .priv_class = &nppscale_class,

+

+    .inputs    = nppscale_inputs,

+    .outputs   = nppscale_outputs,

+};