lavfi: Add pad_vaapi filter

Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>

configure

@@ -3956,6 +3956,7 @@ vstack_qsv_filter_deps="libmfx"
 vstack_qsv_filter_select="qsvvpp"
 xstack_qsv_filter_deps="libmfx"
 xstack_qsv_filter_select="qsvvpp"
+pad_vaapi_filter_deps="vaapi_1"
 
 # examples
 avio_http_serve_files_deps="avformat avutil fork"

doc/filters.texi

@@ -27955,6 +27955,83 @@ first input stream. For the syntax of this option, check the
 See @ref{xstack}.
 @end table
 
+@section pad_vaapi
+
+Add paddings to the input image, and place the original input at the
+provided @var{x}, @var{y} coordinates.
+
+It accepts the following options:
+
+@table @option
+@item width, w
+@item height, h
+Specify an expression for the size of the output image with the
+paddings added. If the value for @var{width} or @var{height} is 0, the
+corresponding input size is used for the output.
+
+The @var{width} expression can reference the value set by the
+@var{height} expression, and vice versa.
+
+The default value of @var{width} and @var{height} is 0.
+
+@item x
+@item y
+Specify the offsets to place the input image at within the padded area,
+with respect to the top/left border of the output image.
+
+The @var{x} expression can reference the value set by the @var{y}
+expression, and vice versa.
+
+The default value of @var{x} and @var{y} is 0.
+
+If @var{x} or @var{y} evaluate to a negative number, they'll be changed
+so the input image is centered on the padded area.
+
+@item color
+Specify the color of the padded area. For the syntax of this option,
+check the @ref{color syntax,,"Color" section in the ffmpeg-utils
+manual,ffmpeg-utils}.
+
+@item aspect
+Pad to an aspect instead to a resolution.
+@end table
+
+The value for the @var{width}, @var{height}, @var{x}, and @var{y}
+options are expressions containing the following constants:
+
+@table @option
+@item in_w
+@item in_h
+The input video width and height.
+
+@item iw
+@item ih
+These are the same as @var{in_w} and @var{in_h}.
+
+@item out_w
+@item out_h
+The output width and height (the size of the padded area), as
+specified by the @var{width} and @var{height} expressions.
+
+@item ow
+@item oh
+These are the same as @var{out_w} and @var{out_h}.
+
+@item x
+@item y
+The x and y offsets as specified by the @var{x} and @var{y}
+expressions, or NAN if not yet specified.
+
+@item a
+same as @var{iw} / @var{ih}
+
+@item sar
+input sample aspect ratio
+
+@item dar
+input display aspect ratio, it is the same as (@var{iw} / @var{ih}) * @var{sar}
+@end table
+
 @c man end VAAPI VIDEO FILTERS
 
 @chapter Vulkan Video Filters

libavfilter/Makefile

@@ -581,6 +581,7 @@ OBJS-$(CONFIG_XSTACK_VAAPI_FILTER)           += vf_stack_vaapi.o framesync.o vaa
 OBJS-$(CONFIG_HSTACK_QSV_FILTER)             += vf_stack_qsv.o framesync.o
 OBJS-$(CONFIG_VSTACK_QSV_FILTER)             += vf_stack_qsv.o framesync.o
 OBJS-$(CONFIG_XSTACK_QSV_FILTER)             += vf_stack_qsv.o framesync.o
+OBJS-$(CONFIG_PAD_VAAPI_FILTER)              += vf_pad_vaapi.o vaapi_vpp.o
 
 OBJS-$(CONFIG_ALLRGB_FILTER)                 += vsrc_testsrc.o
 OBJS-$(CONFIG_ALLYUV_FILTER)                 += vsrc_testsrc.o

libavfilter/allfilters.c

@@ -546,6 +546,7 @@ extern const AVFilter ff_vf_xstack_vaapi;
 extern const AVFilter ff_vf_hstack_qsv;
 extern const AVFilter ff_vf_vstack_qsv;
 extern const AVFilter ff_vf_xstack_qsv;
+extern const AVFilter ff_vf_pad_vaapi;
 
 extern const AVFilter ff_vsrc_allrgb;
 extern const AVFilter ff_vsrc_allyuv;

libavfilter/vf_pad_vaapi.c

@@ -0,0 +1,283 @@
+/*
+ * 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 "libavutil/colorspace.h"
+#include "libavutil/eval.h"
+#include "libavutil/opt.h"
+
+#include "avfilter.h"
+#include "internal.h"
+#include "vaapi_vpp.h"
+#include "video.h"
+
+static const char *const var_names[] = {
+    "in_w",   "iw",
+    "in_h",   "ih",
+    "out_w",  "ow",
+    "out_h",  "oh",
+    "x",
+    "y",
+    "a",
+    "sar",
+    "dar",
+    NULL
+};
+
+enum var_name {
+    VAR_IN_W,   VAR_IW,
+    VAR_IN_H,   VAR_IH,
+    VAR_OUT_W,  VAR_OW,
+    VAR_OUT_H,  VAR_OH,
+    VAR_X,
+    VAR_Y,
+    VAR_A,
+    VAR_SAR,
+    VAR_DAR,
+    VARS_NB
+};
+
+typedef struct PadVAAPIContext {
+    VAAPIVPPContext vpp_ctx; // must be the first field
+    VARectangle rect;
+
+    char *w_expr;
+    char *h_expr;
+    char *x_expr;
+    char *y_expr;
+    AVRational aspect;
+
+    int w, h;
+    int x, y;
+    uint8_t pad_rgba[4];
+} PadVAAPIContext;
+
+static int pad_vaapi_config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *avctx = outlink->src;
+    AVFilterLink *inlink = avctx->inputs[0];
+    PadVAAPIContext *ctx = avctx->priv;
+    VAAPIVPPContext *vpp_ctx = avctx->priv;
+    AVRational adjusted_aspect = ctx->aspect;
+    double var_values[VARS_NB], res;
+    int err, ret;
+    char *expr;
+
+    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];
+
+    av_expr_parse_and_eval(&res, (expr = ctx->w_expr),
+                           var_names, var_values,
+                           NULL, NULL, NULL, NULL, NULL, 0, ctx);
+    ctx->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
+    if ((ret = av_expr_parse_and_eval(&res, (expr = ctx->h_expr),
+                                      var_names, var_values,
+                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+        return ret;
+    ctx->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
+    if (!ctx->h)
+        var_values[VAR_OUT_H] = var_values[VAR_OH] = ctx->h = inlink->h;
+
+    /* evaluate the width again, as it may depend on the evaluated output height */
+    if ((ret = av_expr_parse_and_eval(&res, (expr = ctx->w_expr),
+                                      var_names, var_values,
+                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+        return ret;
+    ctx->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
+    if (!ctx->w)
+        var_values[VAR_OUT_W] = var_values[VAR_OW] = ctx->w = inlink->w;
+
+    if (adjusted_aspect.num && adjusted_aspect.den) {
+        adjusted_aspect = av_div_q(adjusted_aspect, inlink->sample_aspect_ratio);
+        if (ctx->h < av_rescale(ctx->w, adjusted_aspect.den, adjusted_aspect.num)) {
+            ctx->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = av_rescale(ctx->w, adjusted_aspect.den, adjusted_aspect.num);
+        } else {
+            ctx->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = av_rescale(ctx->h, adjusted_aspect.num, adjusted_aspect.den);
+        }
+    }
+
+    /* evaluate x and y */
+    av_expr_parse_and_eval(&res, (expr = ctx->x_expr),
+                           var_names, var_values,
+                           NULL, NULL, NULL, NULL, NULL, 0, ctx);
+    ctx->x = var_values[VAR_X] = res;
+    if ((ret = av_expr_parse_and_eval(&res, (expr = ctx->y_expr),
+                                      var_names, var_values,
+                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+        return ret;
+    ctx->y = var_values[VAR_Y] = res;
+    /* evaluate x again, as it may depend on the evaluated y value */
+    if ((ret = av_expr_parse_and_eval(&res, (expr = ctx->x_expr),
+                                      var_names, var_values,
+                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+        return ret;
+    ctx->x = var_values[VAR_X] = res;
+
+    if (ctx->x < 0 || ctx->x + inlink->w > ctx->w)
+        ctx->x = var_values[VAR_X] = (ctx->w - inlink->w) / 2;
+    if (ctx->y < 0 || ctx->y + inlink->h > ctx->h)
+        ctx->y = var_values[VAR_Y] = (ctx->h - inlink->h) / 2;
+
+    /* sanity check params */
+    if (ctx->w < inlink->w || ctx->h < inlink->h) {
+        av_log(ctx, AV_LOG_ERROR, "Padded dimensions cannot be smaller than input dimensions.\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (ctx->w > avctx->inputs[0]->w) {
+        vpp_ctx->output_width  = ctx->w;
+    } else {
+        vpp_ctx->output_width  = avctx->inputs[0]->w;
+    }
+
+    if (ctx->h > avctx->inputs[0]->h) {
+        vpp_ctx->output_height = ctx->h;
+    } else {
+        vpp_ctx->output_height = avctx->inputs[0]->h;
+    }
+
+    if (ctx->x + avctx->inputs[0]->w > vpp_ctx->output_width ||
+        ctx->y + avctx->inputs[0]->h > vpp_ctx->output_height) {
+        return AVERROR(EINVAL);
+    }
+
+    err = ff_vaapi_vpp_config_output(outlink);
+    if (err < 0)
+        return err;
+
+    return 0;
+}
+
+static int pad_vaapi_filter_frame(AVFilterLink *link, AVFrame *input_frame)
+{
+    AVFilterContext *avctx = link->dst;
+    AVFilterLink *outlink = avctx->outputs[0];
+    VAAPIVPPContext *vpp_ctx = avctx->priv;
+    PadVAAPIContext *pad_ctx = avctx->priv;
+    AVFrame *output_frame = NULL;
+    VAProcPipelineParameterBuffer params;
+    int err;
+
+    if (!input_frame->hw_frames_ctx ||
+        vpp_ctx->va_context == VA_INVALID_ID) {
+        err = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    output_frame = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+    if (!output_frame) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    err = av_frame_copy_props(output_frame, input_frame);
+    if (err < 0)
+        goto fail;
+
+    err = ff_vaapi_vpp_init_params(avctx, &params,
+                                   input_frame, output_frame);
+    if (err < 0)
+        goto fail;
+
+    pad_ctx->rect.x = pad_ctx->x;
+    pad_ctx->rect.y = pad_ctx->y;
+    pad_ctx->rect.width = link->w;
+    pad_ctx->rect.height = link->h;
+    params.output_region = &pad_ctx->rect;
+
+    params.output_background_color = (pad_ctx->pad_rgba[3] << 24 |
+                                      pad_ctx->pad_rgba[0] << 16 |
+                                      pad_ctx->pad_rgba[1] << 8 |
+                                      pad_ctx->pad_rgba[2]);
+
+    err = ff_vaapi_vpp_render_picture(avctx, &params, output_frame);
+    if (err < 0)
+        goto fail;
+
+    av_frame_free(&input_frame);
+
+    return ff_filter_frame(outlink, output_frame);
+
+fail:
+    av_frame_free(&input_frame);
+    av_frame_free(&output_frame);
+    return err;
+}
+
+static av_cold int pad_vaapi_init(AVFilterContext *avctx)
+{
+    VAAPIVPPContext *vpp_ctx = avctx->priv;
+
+    ff_vaapi_vpp_ctx_init(avctx);
+    vpp_ctx->pipeline_uninit = ff_vaapi_vpp_pipeline_uninit;
+    vpp_ctx->output_format = AV_PIX_FMT_NONE;
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(PadVAAPIContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption pad_vaapi_options[] = {
+    { "width",  "set the pad area width",       OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
+    { "w",      "set the pad area width",       OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
+    { "height", "set the pad area height",      OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
+    { "h",      "set the pad area height",      OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
+    { "x",      "set the x offset for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, INT16_MAX, FLAGS },
+    { "y",      "set the y offset for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, INT16_MAX, FLAGS },
+    { "color", "set the color of the padded area border", OFFSET(pad_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
+    { "aspect",  "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, INT16_MAX, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(pad_vaapi);
+
+static const AVFilterPad pad_vaapi_inputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = pad_vaapi_filter_frame,
+        .config_props = &ff_vaapi_vpp_config_input,
+    },
+};
+
+static const AVFilterPad pad_vaapi_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+        .config_props = &pad_vaapi_config_output,
+    },
+};
+
+const AVFilter ff_vf_pad_vaapi = {
+    .name           = "pad_vaapi",
+    .description    = NULL_IF_CONFIG_SMALL("Pad the input video."),
+    .priv_size      = sizeof(PadVAAPIContext),
+    .priv_class     = &pad_vaapi_class,
+    .init           = &pad_vaapi_init,
+    .uninit         = &ff_vaapi_vpp_ctx_uninit,
+    FILTER_INPUTS(pad_vaapi_inputs),
+    FILTER_OUTPUTS(pad_vaapi_outputs),
+    FILTER_QUERY_FUNC(&ff_vaapi_vpp_query_formats),
+    .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
+};