[FFmpeg-devel] [WIP][RFC][PATCH] avfilter: add mergeplanes filter

Paul B Mahol onemda at gmail.com
Sat Sep 28 17:29:06 CEST 2013


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

Should every format be allowed and just checks added in config_output()?

---
 libavfilter/Makefile         |   1 +
 libavfilter/allfilters.c     |   1 +
 libavfilter/vf_mergeplanes.c | 209 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 211 insertions(+)
 create mode 100644 libavfilter/vf_mergeplanes.c

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index b2d3587..0200e29 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -157,6 +157,7 @@ OBJS-$(CONFIG_LUT_FILTER)                    += vf_lut.o
 OBJS-$(CONFIG_LUTRGB_FILTER)                 += vf_lut.o
 OBJS-$(CONFIG_LUTYUV_FILTER)                 += vf_lut.o
 OBJS-$(CONFIG_MCDEINT_FILTER)                += vf_mcdeint.o
+OBJS-$(CONFIG_MERGEPLANES_FILTER)            += vf_mergeplanes.o
 OBJS-$(CONFIG_MP_FILTER)                     += vf_mp.o
 OBJS-$(CONFIG_MPDECIMATE_FILTER)             += vf_mpdecimate.o
 OBJS-$(CONFIG_NEGATE_FILTER)                 += vf_lut.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index ed11d67..8f33281 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -153,6 +153,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(LUTRGB,         lutrgb,         vf);
     REGISTER_FILTER(LUTYUV,         lutyuv,         vf);
     REGISTER_FILTER(MCDEINT,        mcdeint,        vf);
+    REGISTER_FILTER(MERGEPLANES,    mergeplanes,    vf);
     REGISTER_FILTER(MP,             mp,             vf);
     REGISTER_FILTER(MPDECIMATE,     mpdecimate,     vf);
     REGISTER_FILTER(NEGATE,         negate,         vf);
diff --git a/libavfilter/vf_mergeplanes.c b/libavfilter/vf_mergeplanes.c
new file mode 100644
index 0000000..7651d3e
--- /dev/null
+++ b/libavfilter/vf_mergeplanes.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 2013 Paul B Mahol
+ *
+ * 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/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "drawutils.h"
+#include "internal.h"
+#include "framesync.h"
+
+typedef struct MergePlanesContext {
+    const AVClass *class;
+    unsigned nb_inputs;
+
+    FFFrameSync fs;
+    FFFrameSyncIn fsi[3]; /* must be immediately after fs */
+} MergePlanesContext;
+
+#define OFFSET(x) offsetof(MergePlanesContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption mergeplanes_options[] = {
+    { "inputs", "Number of input streams.", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, 4, FLAGS},
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(mergeplanes);
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    MergePlanesContext *s = inlink->dst->priv;
+    return ff_framesync_filter_frame(&s->fs, inlink, in);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    MergePlanesContext *s = ctx->priv;
+    AVFilterFormats *in_formats = NULL;
+    AVFilterFormats *out_formats = NULL;
+    int i;
+
+    ff_add_format(&in_formats, AV_PIX_FMT_GRAY8);
+    switch (s->nb_inputs) {
+    case 4:
+        ff_add_format(&out_formats, AV_PIX_FMT_YUVA444P);
+        for (i = 0; i < s->nb_inputs; i++)
+            ff_formats_ref(in_formats, &ctx->inputs[i]->out_formats);
+        break;
+    case 3:
+        ff_add_format(&out_formats, AV_PIX_FMT_YUV444P);
+        ff_formats_ref(in_formats, &ctx->inputs[0]->out_formats);
+        ff_formats_ref(in_formats, &ctx->inputs[1]->out_formats);
+        ff_formats_ref(in_formats, &ctx->inputs[2]->out_formats);
+        break;
+    case 2:
+        ff_formats_ref(in_formats, &ctx->inputs[1]->out_formats);
+        in_formats = NULL;
+        ff_add_format(&in_formats,  AV_PIX_FMT_YUV444P);
+        ff_formats_ref(in_formats, &ctx->inputs[0]->out_formats);
+        ff_add_format(&out_formats, AV_PIX_FMT_YUVA444P);
+        break;
+    }
+
+    ff_formats_ref(out_formats, &ctx->outputs[0]->in_formats);
+
+    return 0;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+    MergePlanesContext *s = outlink->src->priv;
+    return ff_framesync_request_frame(&s->fs, outlink);
+}
+
+static void merge_planes(AVFilterContext *ctx, AVFrame *in[4], AVFrame *out)
+{
+    MergePlanesContext *s = ctx->priv;
+    int i;
+
+    for (i = 0; i < s->nb_inputs; i++) {
+        av_image_copy_plane(out->data[i], out->linesize[i],
+                            in[i]->data[0], in[i]->linesize[0],
+                            in[i]->width, in[i]->height);
+    }
+}
+
+static int process_frame(FFFrameSync *fs)
+{
+    AVFilterContext *ctx = fs->parent;
+    AVFilterLink *outlink = ctx->outputs[0];
+    MergePlanesContext *s = fs->opaque;
+    AVFrame *in[4] = { NULL };
+    AVFrame *out;
+    int i, ret = 0;
+
+    av_assert0(s->nb_inputs <= 4);
+    for (i = 0; i < s->nb_inputs; i++) {
+        if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], s->nb_inputs - (i + 1))) < 0)
+            return ret;
+    }
+
+    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+    if (!out)
+        return AVERROR(ENOMEM);
+
+    out->pts = av_rescale_q(in[0]->pts, s->fs.time_base, outlink->time_base);
+    merge_planes(ctx, in, out);
+    ret = ff_filter_frame(outlink, out);
+
+    return ret;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    MergePlanesContext *s = ctx->priv;
+    FFFrameSyncIn *in = s->fs.in;
+    int i;
+
+    ff_framesync_init(&s->fs, ctx, s->nb_inputs);
+    s->fs.opaque = s;
+    s->fs.on_event = process_frame;
+
+    for (i = 0; i < s->nb_inputs; i++) {
+        in[i].time_base = ctx->inputs[i]->time_base;
+        in[i].sync   = 1;
+        in[i].before = EXT_STOP;
+        in[i].after  = EXT_STOP;
+    }
+
+    return ff_framesync_configure(&s->fs);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    MergePlanesContext *s = ctx->priv;
+    int i;
+
+    ff_framesync_uninit(&s->fs);
+
+    for (i = 0; i < s->nb_inputs; i++) {
+        av_freep(&ctx->input_pads[i].name);
+    }
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    MergePlanesContext *s = ctx->priv;
+    int i, ret;
+
+    for (i = 0; i < s->nb_inputs; i++) {
+        AVFilterPad pad = { 0 };
+
+        pad.type = AVMEDIA_TYPE_VIDEO;
+        pad.name = av_asprintf("in%d", i);
+        if (!pad.name)
+            return AVERROR(ENOMEM);
+        pad.filter_frame = filter_frame;
+
+        if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0){
+            av_freep(&pad.name);
+            return ret;
+        }
+    }
+
+    return 0;
+}
+
+static const AVFilterPad mergeplanes_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .config_props  = config_output,
+        .request_frame = request_frame,
+    },
+    { NULL }
+};
+
+AVFilter avfilter_vf_mergeplanes = {
+    .name          = "mergeplanes",
+    .description   = NULL_IF_CONFIG_SMALL("Merge planes."),
+    .priv_size     = sizeof(MergePlanesContext),
+    .priv_class    = &mergeplanes_class,
+    .init          = init,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = NULL,
+    .outputs       = mergeplanes_outputs,
+    .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,
+};
-- 
1.7.11.2



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