avfilter: add avgblur filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 326 insertions, 0 deletions

diff --git a/libavfilter/vf_avgblur.c b/libavfilter/vf_avgblur.c
new file mode 100644
index 0000000000..2bb2ab1ed5
--- /dev/null
+++ b/libavfilter/vf_avgblur.c
@@ -0,0 +1,326 @@
+/*
+ * Copyright (c) 2016 Paul B Mahol
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct AverageBlurContext {
+    const AVClass *class;
+
+    int radius;
+    int radiusV;
+    int planes;
+
+    int depth;
+    int planewidth[4];
+    int planeheight[4];
+    float *buffer;
+    int nb_planes;
+
+    int (*filter_horizontally)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
+    int (*filter_vertically)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
+} AverageBlurContext;
+
+#define OFFSET(x) offsetof(AverageBlurContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption avgblur_options[] = {
+    { "sizeX",  "set horizontal size",  OFFSET(radius),  AV_OPT_TYPE_INT, {.i64=1},   1, 1024, FLAGS },
+    { "planes", "set planes to filter", OFFSET(planes),  AV_OPT_TYPE_INT, {.i64=0xF}, 0,  0xF, FLAGS },
+    { "sizeY",  "set vertical size",    OFFSET(radiusV), AV_OPT_TYPE_INT, {.i64=0},   0, 1024, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(avgblur);
+
+typedef struct ThreadData {
+    int height;
+    int width;
+    uint8_t *ptr;
+    int linesize;
+} ThreadData;
+
+#define HORIZONTAL_FILTER(name, type)                                                         \
+static int filter_horizontally_##name(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)\
+{                                                                                             \
+    AverageBlurContext *s = ctx->priv;                                                        \
+    ThreadData *td = arg;                                                                     \
+    const int height = td->height;                                                            \
+    const int width = td->width;                                                              \
+    const int slice_start = (height *  jobnr   ) / nb_jobs;                                   \
+    const int slice_end   = (height * (jobnr+1)) / nb_jobs;                                   \
+    const int radius = FFMIN(s->radius, width / 2);                                           \
+    const int linesize = td->linesize / sizeof(type);                                         \
+    float *buffer = s->buffer;                                                                \
+    const type *src;                                                                          \
+    float *ptr;                                                                               \
+    int y, x;                                                                                 \
+                                                                                              \
+    /* Filter horizontally along each row */                                                  \
+    for (y = slice_start; y < slice_end; y++) {                                               \
+        float acc = 0;                                                                        \
+        int count = 0;                                                                        \
+                                                                                              \
+        src = (const type *)td->ptr + linesize * y;                                           \
+        ptr = buffer + width * y;                                                             \
+                                                                                              \
+        for (x = 0; x < radius; x++) {                                                        \
+            acc += src[x];                                                                    \
+        }                                                                                     \
+        count += radius;                                                                      \
+                                                                                              \
+        for (x = 0; x <= radius; x++) {                                                       \
+            acc += src[x + radius];                                                           \
+            count++;                                                                          \
+            ptr[x] = acc / count;                                                             \
+        }                                                                                     \
+                                                                                              \
+        for (; x < width - radius; x++) {                                                     \
+            acc += src[x + radius] - src[x - radius - 1];                                     \
+            ptr[x] = acc / count;                                                             \
+        }                                                                                     \
+                                                                                              \
+        for (; x < width; x++) {                                                              \
+            acc -= src[x - radius];                                                           \
+            count--;                                                                          \
+            ptr[x] = acc / count;                                                             \
+        }                                                                                     \
+    }                                                                                         \
+                                                                                              \
+    return 0;                                                                                 \
+}
+
+HORIZONTAL_FILTER(8, uint8_t)
+HORIZONTAL_FILTER(16, uint16_t)
+
+#define VERTICAL_FILTER(name, type)                                                           \
+static int filter_vertically_##name(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)  \
+{                                                                                             \
+    AverageBlurContext *s = ctx->priv;                                                        \
+    ThreadData *td = arg;                                                                     \
+    const int height = td->height;                                                            \
+    const int width = td->width;                                                              \
+    const int slice_start = (width *  jobnr   ) / nb_jobs;                                    \
+    const int slice_end   = (width * (jobnr+1)) / nb_jobs;                                    \
+    const int radius = FFMIN(s->radiusV, height / 2);                                         \
+    const int linesize = td->linesize / sizeof(type);                                         \
+    type *buffer = (type *)td->ptr;                                                           \
+    const float *src;                                                                         \
+    type *ptr;                                                                                \
+    int i, x;                                                                                 \
+                                                                                              \
+    /* Filter vertically along each column */                                                 \
+    for (x = slice_start; x < slice_end; x++) {                                               \
+        float acc = 0;                                                                        \
+        int count = 0;                                                                        \
+                                                                                              \
+        ptr = buffer + x;                                                                     \
+        src = s->buffer + x;                                                                  \
+                                                                                              \
+        for (i = 0; i < radius; i++) {                                                        \
+            acc += src[0];                                                                    \
+            src += width;                                                                     \
+        }                                                                                     \
+        count += radius;                                                                      \
+                                                                                              \
+        src = s->buffer + x;                                                                  \
+        ptr = buffer + x;                                                                     \
+        for (i = 0; i <= radius; i++) {                                                       \
+            acc += src[(i + radius) * width];                                                 \
+            count++;                                                                          \
+            ptr[i * linesize] = acc / count;                                                  \
+        }                                                                                     \
+                                                                                              \
+        for (; i < height - radius; i++) {                                                    \
+            acc += src[(i + radius) * width] - src[(i - radius - 1) * width];                 \
+            ptr[i * linesize] = acc / count;                                                  \
+        }                                                                                     \
+                                                                                              \
+        for (; i < height; i++) {                                                             \
+            acc -= src[(i - radius) * width];                                                 \
+            count--;                                                                          \
+            ptr[i * linesize] = acc / count;                                                  \
+        }                                                                                     \
+    }                                                                                         \
+                                                                                              \
+    return 0;                                                                                 \
+}
+
+VERTICAL_FILTER(8, uint8_t)
+VERTICAL_FILTER(16, uint16_t)
+
+static int config_input(AVFilterLink *inlink)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    AverageBlurContext *s = inlink->dst->priv;
+
+    s->depth = desc->comp[0].depth;
+    s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+    s->planewidth[0] = s->planewidth[3] = inlink->w;
+    s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+    s->planeheight[0] = s->planeheight[3] = inlink->h;
+
+    s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+    s->buffer = av_malloc_array(inlink->w, inlink->h * sizeof(*s->buffer));
+    if (!s->buffer)
+        return AVERROR(ENOMEM);
+
+    if (s->radiusV <= 0) {
+        s->radiusV = s->radius;
+    }
+
+    if (s->depth == 8) {
+        s->filter_horizontally = filter_horizontally_8;
+        s->filter_vertically = filter_vertically_8;
+    } else {
+        s->filter_horizontally = filter_horizontally_16;
+        s->filter_vertically = filter_vertically_16;
+    }
+
+    return 0;
+}
+
+static void averageiir2d(AVFilterContext *ctx, AVFrame *in, AVFrame *out, int plane)
+{
+    AverageBlurContext *s = ctx->priv;
+    const int width = s->planewidth[plane];
+    const int height = s->planeheight[plane];
+    const int nb_threads = ff_filter_get_nb_threads(ctx);
+    ThreadData td;
+
+    td.width = width;
+    td.height = height;
+    td.ptr = in->data[plane];
+    td.linesize = in->linesize[plane];
+    ctx->internal->execute(ctx, s->filter_horizontally, &td, NULL, FFMIN(height, nb_threads));
+    td.ptr = out->data[plane];
+    td.linesize = out->linesize[plane];
+    ctx->internal->execute(ctx, s->filter_vertically, &td, NULL, FFMIN(width, nb_threads));
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
+        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
+        AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
+        AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
+        AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+        AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
+        AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
+        AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
+        AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
+        AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
+        AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
+        AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
+        AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
+        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
+        AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
+        AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
+        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
+        AV_PIX_FMT_NONE
+    };
+
+    return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AverageBlurContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AVFrame *out;
+    int plane;
+
+    if (av_frame_is_writable(in)) {
+        out = in;
+    } else {
+        out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+        if (!out) {
+            av_frame_free(&in);
+            return AVERROR(ENOMEM);
+        }
+        av_frame_copy_props(out, in);
+    }
+
+    for (plane = 0; plane < s->nb_planes; plane++) {
+        const int height = s->planeheight[plane];
+        const int width = s->planewidth[plane];
+
+        if (!(s->planes & (1 << plane))) {
+            if (out != in)
+                av_image_copy_plane(out->data[plane], out->linesize[plane],
+                                    in->data[plane], in->linesize[plane],
+                                    width * ((s->depth + 7) / 8), height);
+            continue;
+        }
+
+        averageiir2d(ctx, in, out, plane);
+    }
+
+    if (out != in)
+        av_frame_free(&in);
+    return ff_filter_frame(outlink, out);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    AverageBlurContext *s = ctx->priv;
+
+    av_freep(&s->buffer);
+}
+
+static const AVFilterPad avgblur_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = config_input,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad avgblur_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_avgblur = {
+    .name          = "avgblur",
+    .description   = NULL_IF_CONFIG_SMALL("Apply Average Blur filter."),
+    .priv_size     = sizeof(AverageBlurContext),
+    .priv_class    = &avgblur_class,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = avgblur_inputs,
+    .outputs       = avgblur_outputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
+};