[FFmpeg-devel] [PATCH] lavfi: phasescope filter

Paul B Mahol onemda at gmail.com
Mon Mar 25 23:23:51 CET 2013


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

TODO:
documentation, more modes, colors, sample formats, channel layouts and fancy output.

---
 libavfilter/Makefile         |   1 +
 libavfilter/allfilters.c     |   1 +
 libavfilter/avf_phasescope.c | 214 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 216 insertions(+)
 create mode 100644 libavfilter/avf_phasescope.c

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 690b1cb..40edb36 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -212,6 +212,7 @@ OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/pullup.o
 
 # multimedia filters
 OBJS-$(CONFIG_CONCAT_FILTER)                 += avf_concat.o
+OBJS-$(CONFIG_PHASESCOPE_FILTER)             += avf_phasescope.o
 OBJS-$(CONFIG_SHOWSPECTRUM_FILTER)           += avf_showspectrum.o
 OBJS-$(CONFIG_SHOWWAVES_FILTER)              += avf_showwaves.o
 
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 45a67e5..eaf0127 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -179,6 +179,7 @@ void avfilter_register_all(void)
 
     /* multimedia filters */
     REGISTER_FILTER(CONCAT,         concat,         avf);
+    REGISTER_FILTER(PHASESCOPE,     phasescope,     avf);
     REGISTER_FILTER(SHOWSPECTRUM,   showspectrum,   avf);
     REGISTER_FILTER(SHOWWAVES,      showwaves,      avf);
 
diff --git a/libavfilter/avf_phasescope.c b/libavfilter/avf_phasescope.c
new file mode 100644
index 0000000..9b4e967
--- /dev/null
+++ b/libavfilter/avf_phasescope.c
@@ -0,0 +1,214 @@
+/*
+ * 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
+ */
+
+/**
+ * @file
+ * audio to video multimedia phase scope filter
+ */
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "audio.h"
+#include "video.h"
+#include "internal.h"
+
+typedef struct PhaseScopeContext {
+    const AVClass *class;
+    AVFrame *outpicref;
+    int w, h;
+    int nb_samples;
+    int contrast;
+    int dissolve;
+    AVRational frame_rate;
+} PhaseScopeContext;
+
+#define OFFSET(x) offsetof(PhaseScopeContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption phasescope_options[] = {
+    { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
+    { "r",    "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
+    { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="320x240"}, 0, 0, FLAGS },
+    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="320x240"}, 0, 0, FLAGS },
+    { "contrast", "set contrast", OFFSET(contrast), AV_OPT_TYPE_INT, {.i64=255}, 1, 255, FLAGS },
+    { "dissolve", "set dissolve speed", OFFSET(dissolve), AV_OPT_TYPE_INT, {.i64=1}, 0, 255, FLAGS },
+    { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(phasescope);
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+    PhaseScopeContext *p = ctx->priv;
+    int err;
+
+    p->class = &phasescope_class;
+    av_opt_set_defaults(p);
+
+    if ((err = av_set_options_string(p, args, "=", ":")) < 0)
+        return err;
+
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    PhaseScopeContext *p = ctx->priv;
+
+    av_frame_free(&p->outpicref);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layout = NULL;
+    AVFilterLink *inlink = ctx->inputs[0];
+    AVFilterLink *outlink = ctx->outputs[0];
+    static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE };
+    static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE };
+
+    formats = ff_make_format_list(sample_fmts);
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ff_formats_ref(formats, &inlink->out_formats);
+
+    ff_add_channel_layout(&layout, AV_CH_LAYOUT_STEREO);
+    ff_channel_layouts_ref(layout, &inlink->out_channel_layouts);
+
+    formats = ff_all_samplerates();
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ff_formats_ref(formats, &inlink->out_samplerates);
+
+    formats = ff_make_format_list(pix_fmts);
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ff_formats_ref(formats, &outlink->in_formats);
+
+    return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    PhaseScopeContext *p = ctx->priv;
+
+    p->nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(p->frame_rate)) + 0.5);
+    inlink->partial_buf_size =
+    inlink->min_samples =
+    inlink->max_samples = p->nb_samples;
+
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    PhaseScopeContext *p = outlink->src->priv;
+
+    outlink->w = p->w;
+    outlink->h = p->h;
+    outlink->sample_aspect_ratio = (AVRational){1,1};
+    outlink->frame_rate = p->frame_rate;
+    p->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+    if (!p->outpicref)
+        return AVERROR(ENOMEM);
+    memset(p->outpicref->data[0],   0, outlink->h * p->outpicref->linesize[0]);
+    memset(p->outpicref->data[1], 128, outlink->h * p->outpicref->linesize[1]);
+    memset(p->outpicref->data[2], 128, outlink->h * p->outpicref->linesize[2]);
+
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AVFilterLink *outlink = ctx->outputs[0];
+    PhaseScopeContext *p = ctx->priv;
+    const int nb_samples = insamples->nb_samples;
+    const int linesize = p->outpicref->linesize[0];
+    const int hw = p->w / 2;
+    const int hh = p->h / 2;
+    int16_t *ptr = (int16_t *)insamples->data[0];
+    int i, j, chan, v, ret;
+    uint8_t *dst;
+
+    p->outpicref->pts = insamples->pts;
+
+    if (p->dissolve) {
+        for (i = 0; i < p->h; i++) {
+            for (j = 0; j < p->w; j++) {
+                dst = &p->outpicref->data[0][i * linesize + j];
+                v = *dst;
+                *dst = FFMAX(v - p->dissolve, 0);
+            }
+        }
+    }
+
+    for (i = 0; i < nb_samples; i++) {
+        int x, y;
+        for (chan = 0; chan < 2; chan++, ptr += 2) {
+            x = ((ptr[1] - (int)ptr[0]) / (float)UINT16_MAX + 1) * hw;
+            y = ((ptr[0] + (int)ptr[1]) / (float)UINT16_MAX + 1) * hh;
+            dst = &p->outpicref->data[0][y * linesize + x];
+            *dst = FFMIN(*dst + p->contrast, 255);
+        }
+
+    }
+
+    av_frame_free(&insamples);
+
+    ret = ff_filter_frame(outlink, av_frame_clone(p->outpicref));
+
+    return ret;
+}
+
+static const AVFilterPad phasescope_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_AUDIO,
+        .config_props = config_input,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad phasescope_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .config_props  = config_output,
+    },
+    { NULL }
+};
+
+AVFilter avfilter_avf_phasescope = {
+    .name           = "phasescope",
+    .description    = NULL_IF_CONFIG_SMALL("Audio phase scope."),
+    .init           = init,
+    .uninit         = uninit,
+    .query_formats  = query_formats,
+    .priv_size      = sizeof(PhaseScopeContext),
+    .inputs         = phasescope_inputs,
+    .outputs        = phasescope_outputs,
+    .priv_class     = &phasescope_class,
+};
-- 
1.7.11.2



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