[FFmpeg-devel] [PATCH] avfilter/vpp_amf: add option reset_sar

[Gyan Doshi <ffmpeg@gyani.pro>]

4b77a0a681 added a new consumer of ff_scale_adjust_dimensions
which was recently modified to allow for square pixel output.

This commit extends the new option to vpp_amf, and unbreaks the building
of vf_amf_common.c
---
 doc/filters.texi            |  3 +++
 libavfilter/vf_amf_common.c | 10 ++++++++--
 libavfilter/vf_amf_common.h |  1 +
 libavfilter/vf_vpp_amf.c    |  1 +
 4 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index d72b0da7f3..4cefef6cbc 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -25796,6 +25796,9 @@ pixel format is used.
 @item force_divisible_by
 Work the same as the identical @ref{scale} filter options.
 
+@item reset_sar
+Works the same as the identical @ref{scale} filter option.
+
 @anchor{color_profile}
 @item color_profile
 Specify all color properties at once.
diff --git a/libavfilter/vf_amf_common.c b/libavfilter/vf_amf_common.c
index 9c48b4218e..cbc532f822 100644
--- a/libavfilter/vf_amf_common.c
+++ b/libavfilter/vf_amf_common.c
@@ -158,7 +158,9 @@ int amf_filter_filter_frame(AVFilterLink *inlink, AVFrame *in)
         goto fail;
     }
 
-    if (inlink->sample_aspect_ratio.num) {
+    if (ctx->reset_sar)
+        outlink->sample_aspect_ratio = (AVRational){1, 1};
+    else 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;
@@ -274,6 +276,7 @@ int amf_init_filter_config(AVFilterLink *outlink, enum AVPixelFormat *in_format)
     enum AVPixelFormat out_sw_format = ctx->format;
     FilterLink        *inl = ff_filter_link(inlink);
     FilterLink        *outl = ff_filter_link(outlink);
+    double w_adj = 1.0;
 
     if ((err = ff_scale_eval_dimensions(avctx,
                                         ctx->w_expr, ctx->h_expr,
@@ -281,8 +284,11 @@ int amf_init_filter_config(AVFilterLink *outlink, enum AVPixelFormat *in_format)
                                         &ctx->width, &ctx->height)) < 0)
         return err;
 
+    if (ctx->reset_sar)
+        w_adj = inlink->sample_aspect_ratio.num ? (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1.0;
+
     ff_scale_adjust_dimensions(inlink, &ctx->width, &ctx->height,
-                               ctx->force_original_aspect_ratio, ctx->force_divisible_by);
+                               ctx->force_original_aspect_ratio, ctx->force_divisible_by, w_adj);
 
     av_buffer_unref(&ctx->amf_device_ref);
     av_buffer_unref(&ctx->hwframes_in_ref);
diff --git a/libavfilter/vf_amf_common.h b/libavfilter/vf_amf_common.h
index c4b5ba659a..d0a0214978 100644
--- a/libavfilter/vf_amf_common.h
+++ b/libavfilter/vf_amf_common.h
@@ -48,6 +48,7 @@ typedef struct AMFFilterContext {
     char *format_str;
     int force_original_aspect_ratio;
     int force_divisible_by;
+    int reset_sar;
 
     AMFComponent        *component;
     AVBufferRef         *amf_device_ref;
diff --git a/libavfilter/vf_vpp_amf.c b/libavfilter/vf_vpp_amf.c
index 87bd68074f..92923a4757 100644
--- a/libavfilter/vf_vpp_amf.c
+++ b/libavfilter/vf_vpp_amf.c
@@ -221,6 +221,7 @@ static const AVOption vpp_amf_options[] = {
     { "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "force_oar" },
     { "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, "force_oar" },
     { "force_divisible_by", "enforce that the output resolution is divisible by a defined integer when force_original_aspect_ratio is used", OFFSET(force_divisible_by), AV_OPT_TYPE_INT, { .i64 = 1}, 1, 256, FLAGS },
+    { "reset_sar", "reset SAR to 1 and scale to square pixels if scaling proportionally", OFFSET(reset_sar), AV_OPT_TYPE_BOOL, { .i64 = 0}, 0, 1, FLAGS },
 
     { NULL },
 };
-- 
2.46.1

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