[FFmpeg-devel] [PATCH] avfilter: add mix filter
Paul B Mahol
onemda at gmail.com
Mon Nov 20 21:59:09 EET 2017
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 28 +++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_mix.c | 283 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 313 insertions(+)
create mode 100644 libavfilter/vf_mix.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 63ce899784..5fad742610 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -10571,6 +10571,34 @@ Default method is @samp{fdiff}.
Scene change detection threshold. Default is @code{5.0}.
@end table
+ at section mix
+
+Mix several video input streams into one video stream.
+
+A description of the accepted options follows.
+
+ at table @option
+ at item nb_inputs
+The number of inputs. If unspecified, it defaults to 2.
+
+ at item weights
+Specify weight of each input video stream as sequence.
+Each weight is separated by space.
+
+ at item duration
+Specifiy how end of stream is determined.
+ at table @samp
+ at item longest
+The duration of the longest input. (default)
+
+ at item shortest
+The duration of the shortest input.
+
+ at item first
+The duration of the first input.
+ at end table
+ at end table
+
@section mpdecimate
Drop frames that do not differ greatly from the previous frame in
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 71c6333a52..74212c11f3 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -241,6 +241,7 @@ OBJS-$(CONFIG_MESTIMATE_FILTER) += vf_mestimate.o motion_estimation
OBJS-$(CONFIG_METADATA_FILTER) += f_metadata.o
OBJS-$(CONFIG_MIDEQUALIZER_FILTER) += vf_midequalizer.o framesync.o
OBJS-$(CONFIG_MINTERPOLATE_FILTER) += vf_minterpolate.o motion_estimation.o
+OBJS-$(CONFIG_MIX_FILTER) += vf_mix.o
OBJS-$(CONFIG_MPDECIMATE_FILTER) += vf_mpdecimate.o
OBJS-$(CONFIG_NEGATE_FILTER) += vf_lut.o
OBJS-$(CONFIG_NLMEANS_FILTER) += vf_nlmeans.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 6d92b3ab5a..79379a38ea 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -251,6 +251,7 @@ static void register_all(void)
REGISTER_FILTER(METADATA, metadata, vf);
REGISTER_FILTER(MIDEQUALIZER, midequalizer, vf);
REGISTER_FILTER(MINTERPOLATE, minterpolate, vf);
+ REGISTER_FILTER(MIX, mix, vf);
REGISTER_FILTER(MPDECIMATE, mpdecimate, vf);
REGISTER_FILTER(NEGATE, negate, vf);
REGISTER_FILTER(NLMEANS, nlmeans, vf);
diff --git a/libavfilter/vf_mix.c b/libavfilter/vf_mix.c
new file mode 100644
index 0000000000..c22a861412
--- /dev/null
+++ b/libavfilter/vf_mix.c
@@ -0,0 +1,283 @@
+/*
+ * Copyright (c) 2017 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/avstring.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "framesync.h"
+#include "video.h"
+
+typedef struct MixContext {
+ const AVClass *class;
+ const AVPixFmtDescriptor *desc;
+ char *weights_str;
+ int nb_inputs;
+ int duration;
+ float *weights;
+ float wfactor;
+
+ int depth;
+ int nb_planes;
+ int linesize[4];
+ int height[4];
+
+ AVFrame **frames;
+ FFFrameSync fs;
+} MixContext;
+
+static int query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *pix_fmts = NULL;
+ int fmt, ret;
+
+ for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
+ if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
+ desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
+ desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
+ (ret = ff_add_format(&pix_fmts, fmt)) < 0)
+ return ret;
+ }
+
+ return ff_set_common_formats(ctx, pix_fmts);
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ MixContext *s = ctx->priv;
+ char *p, *arg, *saveptr = NULL;
+ int i, ret;
+
+ s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
+ if (!s->frames)
+ return AVERROR(ENOMEM);
+
+ s->weights = av_calloc(s->nb_inputs, sizeof(*s->weights));
+ if (!s->weights)
+ return AVERROR(ENOMEM);
+
+ for (i = 0; i < s->nb_inputs; i++) {
+ AVFilterPad pad = { 0 };
+
+ pad.type = AVMEDIA_TYPE_VIDEO;
+ pad.name = av_asprintf("input%d", i);
+ if (!pad.name)
+ return AVERROR(ENOMEM);
+
+ if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
+ av_freep(&pad.name);
+ return ret;
+ }
+ }
+
+ p = s->weights_str;
+ for (i = 0; i < s->nb_inputs; i++) {
+ if (!(arg = av_strtok(p, " ", &saveptr)))
+ break;
+
+ p = NULL;
+ sscanf(arg, "%f", &s->weights[i]);
+ s->wfactor += s->weights[i];
+ }
+ s->wfactor = 1 / s->wfactor;
+
+ return 0;
+}
+
+static int process_frame(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ AVFilterLink *outlink = ctx->outputs[0];
+ MixContext *s = fs->opaque;
+ AVFrame **in = s->frames;
+ AVFrame *out;
+ int i, p, ret, x, y;
+
+ for (i = 0; i < s->nb_inputs; i++) {
+ if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
+ return ret;
+ }
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out)
+ return AVERROR(ENOMEM);
+ out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
+
+ if (s->depth <= 8) {
+ for (p = 0; p < s->nb_planes; p++) {
+ uint8_t *dst = out->data[p];
+
+ for (y = 0; y < s->height[p]; y++) {
+ for (x = 0; x < s->linesize[p]; x++) {
+ int val = 0;
+
+ for (i = 0; i < s->nb_inputs; i++) {
+ uint8_t src = in[i]->data[p][y * s->linesize[p] + x];
+
+ val += src * s->weights[i];
+ }
+
+ dst[x] = val * s->wfactor;
+ }
+
+ dst += out->linesize[p];
+ }
+ }
+ } else {
+ for (p = 0; p < s->nb_planes; p++) {
+ uint16_t *dst = (uint16_t *)out->data[p];
+
+ for (y = 0; y < s->height[p]; y++) {
+ for (x = 0; x < s->linesize[p]; x++) {
+ int val = 0;
+
+ for (i = 0; i < s->nb_inputs; i++) {
+ uint16_t src = AV_RN16(in[i]->data[p] + y * s->linesize[p] + x * 2);
+
+ val += src * s->weights[i];
+ }
+
+ dst[x] = val * s->wfactor;
+ }
+
+ dst += out->linesize[p] / 2;
+ }
+ }
+ }
+
+ return ff_filter_frame(outlink, out);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ MixContext *s = ctx->priv;
+ AVRational time_base = ctx->inputs[0]->time_base;
+ AVRational frame_rate = ctx->inputs[0]->frame_rate;
+ AVFilterLink *inlink = ctx->inputs[0];
+ int height = ctx->inputs[0]->h;
+ int width = ctx->inputs[0]->w;
+ FFFrameSyncIn *in;
+ int i, ret;
+
+ for (i = 1; i < s->nb_inputs; i++) {
+ if (ctx->inputs[i]->h != height || ctx->inputs[i]->w != width) {
+ av_log(ctx, AV_LOG_ERROR, "Input %d size (%dx%d) does not match input %d size (%dx%d).\n", i, ctx->inputs[i]->w, ctx->inputs[i]->h, 0, width, height);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ s->desc = av_pix_fmt_desc_get(outlink->format);
+ if (!s->desc)
+ return AVERROR_BUG;
+ s->nb_planes = av_pix_fmt_count_planes(outlink->format);
+ s->depth = s->desc->comp[0].depth;
+
+ outlink->w = width;
+ outlink->h = height;
+ outlink->time_base = time_base;
+ outlink->frame_rate = frame_rate;
+
+ if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
+ return ret;
+
+ in = s->fs.in;
+ s->fs.opaque = s;
+ s->fs.on_event = process_frame;
+
+ if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
+ return ret;
+
+ s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
+ s->height[0] = s->height[3] = inlink->h;
+
+ for (i = 0; i < s->nb_inputs; i++) {
+ AVFilterLink *inlink = ctx->inputs[i];
+
+ in[i].time_base = inlink->time_base;
+ in[i].sync = 1;
+ in[i].before = EXT_STOP;
+ in[i].after = (s->duration == 1 || (s->duration == 2 && i == 0)) ? EXT_STOP : EXT_INFINITY;
+ }
+
+ return ff_framesync_configure(&s->fs);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ MixContext *s = ctx->priv;
+ int i;
+
+ ff_framesync_uninit(&s->fs);
+ av_freep(&s->frames);
+ av_freep(&s->weights);
+
+ for (i = 0; i < ctx->nb_inputs; i++)
+ av_freep(&ctx->input_pads[i].name);
+}
+
+static int activate(AVFilterContext *ctx)
+{
+ MixContext *s = ctx->priv;
+ return ff_framesync_activate(&s->fs);
+}
+
+#define OFFSET(x) offsetof(MixContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption mix_options[] = {
+ { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
+ { "weights", "set weight for each input", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1"}, 0, 0, .flags = FLAGS },
+ { "duration", "how to determine end of stream", OFFSET(duration), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, .flags = FLAGS, "duration" },
+ { "longest", "Duration of longest input", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "duration" },
+ { "shortest", "Duration of shortest input", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "duration" },
+ { "first", "Duration of first input", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "duration" },
+ { NULL },
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(mix);
+
+AVFilter ff_vf_mix = {
+ .name = "mix",
+ .description = NULL_IF_CONFIG_SMALL("Mix video inputs."),
+ .priv_size = sizeof(MixContext),
+ .priv_class = &mix_class,
+ .query_formats = query_formats,
+ .outputs = outputs,
+ .init = init,
+ .uninit = uninit,
+ .activate = activate,
+ .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
+};
--
2.11.0
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