avcodec/libvpxenc: add VP8/9 sharpness config option

This commit adds configuration options to libvpxenc.c that can be used to
tune the sharpness parameter for VP8 and VP9.
Signed-off-by: Rene Claus <rclaus@google.com>
Signed-off-by: James Zern <jzern@google.com>

doc/encoders.texi

@@ -1767,6 +1767,10 @@ Set number of frames to look ahead for frametype and ratecontrol.
 @item error-resilient
 Enable error resiliency features.
 
+@item sharpness @var{integer}
+Increase sharpness at the expense of lower PSNR.
+The valid range is [0, 7].
+
 @item VP8-specific options
 @table @option
 @item ts-parameters

libavcodec/libvpxenc.c

@@ -76,6 +76,7 @@ typedef struct VPxEncoderContext {
     struct FrameListData *coded_frame_list;
 
     int cpu_used;
+    int sharpness;
     /**
      * VP8 specific flags, see VP8F_* below.
      */
@@ -130,6 +131,7 @@ static const char *const ctlidstr[] = {
     [VP8E_SET_TUNING]            = "VP8E_SET_TUNING",
     [VP8E_SET_CQ_LEVEL]          = "VP8E_SET_CQ_LEVEL",
     [VP8E_SET_MAX_INTRA_BITRATE_PCT] = "VP8E_SET_MAX_INTRA_BITRATE_PCT",
+    [VP8E_SET_SHARPNESS]               = "VP8E_SET_SHARPNESS",
 #if CONFIG_LIBVPX_VP9_ENCODER
     [VP9E_SET_LOSSLESS]                = "VP9E_SET_LOSSLESS",
     [VP9E_SET_TILE_COLUMNS]            = "VP9E_SET_TILE_COLUMNS",
@@ -751,6 +753,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
         return AVERROR(EINVAL);
     }
 
+    if (ctx->sharpness >= 0)
+        codecctl_int(avctx, VP8E_SET_SHARPNESS, ctx->sharpness);
+
     if (CONFIG_LIBVPX_VP8_ENCODER && avctx->codec_id == AV_CODEC_ID_VP8) {
 #if FF_API_PRIVATE_OPT
 FF_DISABLE_DEPRECATION_WARNINGS
@@ -1193,6 +1198,7 @@ static int vpx_encode(AVCodecContext *avctx, AVPacket *pkt,
     {"arnr_strength", "altref noise reduction filter strength", offsetof(VPxContext, arnr_strength), AV_OPT_TYPE_INT, {.i64 = 3}, 0, 6, VE}, \
     {"arnr_type", "altref noise reduction filter type", offsetof(VPxContext, arnr_type), AV_OPT_TYPE_INT, {.i64 = 3}, 1, 3, VE}, \
     {"rc_lookahead", "Number of frames to look ahead for alternate reference frame selection", offsetof(VPxContext, lag_in_frames), AV_OPT_TYPE_INT, {.i64 = 25}, 0, 25, VE}, \
+    {"sharpness", "Increase sharpness at the expense of lower PSNR", offsetof(VPxContext, sharpness), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 7, VE},
 
 #if CONFIG_LIBVPX_VP8_ENCODER
 static const AVOption vp8_options[] = {