avfilter: add abitscope multimedia filter

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

Changelog

@@ -17,6 +17,7 @@ version <next>:
 - MIDI Sample Dump Standard demuxer
 - readeia608 filter
 - Sample Dump eXchange demuxer
+- abitscope multimedia filter
 
 version 3.2:
 - libopenmpt demuxer

doc/filters.texi

@@ -15627,6 +15627,28 @@ tools.
 
 Below is a description of the currently available multimedia filters.
 
+@section abitscope
+
+Convert input audio to a video output, displaying the audio bit scope.
+
+The filter accepts the following options:
+
+@table @option
+@item rate, r
+Set frame rate, expressed as number of frames per second. Default
+value is "25".
+
+@item size, s
+Specify the video size for the output. For the syntax of this option, check the
+@ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}.
+Default value is @code{1024x256}.
+
+@item colors
+Specify list of colors separated by space or by '|' which will be used to
+draw channels. Unrecognized or missing colors will be replaced
+by white color.
+@end table
+
 @section ahistogram
 
 Convert input audio to a video output, displaying the volume histogram.

libavfilter/Makefile

@@ -333,6 +333,7 @@ OBJS-$(CONFIG_YUVTESTSRC_FILTER)             += vsrc_testsrc.o
 OBJS-$(CONFIG_NULLSINK_FILTER)               += vsink_nullsink.o
 
 # multimedia filters
+OBJS-$(CONFIG_ABITSCOPE_FILTER)              += avf_abitscope.o
 OBJS-$(CONFIG_ADRAWGRAPH_FILTER)             += f_drawgraph.o
 OBJS-$(CONFIG_AHISTOGRAM_FILTER)             += avf_ahistogram.o
 OBJS-$(CONFIG_APHASEMETER_FILTER)            += avf_aphasemeter.o

libavfilter/allfilters.c

@@ -348,6 +348,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(NULLSINK,       nullsink,       vsink);
 
     /* multimedia filters */
+    REGISTER_FILTER(ABITSCOPE,      abitscope,      avf);
     REGISTER_FILTER(ADRAWGRAPH,     adrawgraph,     avf);
     REGISTER_FILTER(AHISTOGRAM,     ahistogram,     avf);
     REGISTER_FILTER(APHASEMETER,    aphasemeter,    avf);

libavfilter/avf_abitscope.c

@@ -0,0 +1,250 @@
+/*
+ * Copyright (c) 2016 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/intreadwrite.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 AudioBitScopeContext {
+    const AVClass *class;
+    int w, h;
+    AVRational frame_rate;
+    char *colors;
+
+    int nb_channels;
+    int depth;
+    uint8_t *fg;
+
+    uint64_t counter[64];
+} AudioBitScopeContext;
+
+#define OFFSET(x) offsetof(AudioBitScopeContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption abitscope_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="1024x256"}, 0, 0, FLAGS },
+    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="1024x256"}, 0, 0, FLAGS },
+    { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(abitscope);
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layouts;
+    AVFilterLink *inlink = ctx->inputs[0];
+    AVFilterLink *outlink = ctx->outputs[0];
+    static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_NONE };
+    static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
+    int ret;
+
+    formats = ff_make_format_list(sample_fmts);
+    if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
+        return ret;
+
+    layouts = ff_all_channel_counts();
+    if (!layouts)
+        return AVERROR(ENOMEM);
+    if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
+        return ret;
+
+    formats = ff_all_samplerates();
+    if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
+        return ret;
+
+    formats = ff_make_format_list(pix_fmts);
+    if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
+        return ret;
+
+    return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AudioBitScopeContext *s = ctx->priv;
+    int ch, nb_samples;
+    char *colors, *saveptr = NULL;
+
+    nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5);
+    inlink->partial_buf_size =
+    inlink->min_samples =
+    inlink->max_samples = nb_samples;
+    s->nb_channels = inlink->channels;
+    s->depth = inlink->format == AV_SAMPLE_FMT_S16P ? 16 : 32;
+
+    s->fg = av_malloc_array(s->nb_channels, 4 * sizeof(*s->fg));
+    if (!s->fg)
+        return AVERROR(ENOMEM);
+
+    colors = av_strdup(s->colors);
+    if (!colors)
+        return AVERROR(ENOMEM);
+
+    for (ch = 0; ch < s->nb_channels; ch++) {
+        uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };
+        char *color;
+
+        color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);
+        if (color)
+            av_parse_color(fg, color, -1, ctx);
+        s->fg[4 * ch + 0] = fg[0];
+        s->fg[4 * ch + 1] = fg[1];
+        s->fg[4 * ch + 2] = fg[2];
+        s->fg[4 * ch + 3] = fg[3];
+    }
+    av_free(colors);
+
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AudioBitScopeContext *s = outlink->src->priv;
+
+    outlink->w = s->w;
+    outlink->h = s->h;
+    outlink->sample_aspect_ratio = (AVRational){1,1};
+    outlink->frame_rate = s->frame_rate;
+
+    return 0;
+}
+
+static void count_bits(AudioBitScopeContext *s, uint32_t sample, int max)
+{
+    int i;
+
+    for (i = 0; i < max; i++) {
+        if (sample & (1 << i))
+            s->counter[i]++;
+    }
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AudioBitScopeContext *s = ctx->priv;
+    AVFrame *outpicref;
+    int ch, i, j, b;
+
+    outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+    if (!outpicref) {
+        av_frame_free(&insamples);
+        return AVERROR(ENOMEM);
+    }
+
+    for (i = 0; i < outlink->h; i++)
+        memset(outpicref->data[0] + i * outpicref->linesize[0], 0, outlink->w * 4);
+
+    outpicref->pts = insamples->pts;
+    switch (insamples->format) {
+    case AV_SAMPLE_FMT_S16P:
+        for (ch = 0; ch < inlink->channels; ch++) {
+            uint16_t *in = (uint16_t *)insamples->extended_data[ch];
+            int w = outpicref->width / inlink->channels;
+            int h = outpicref->height / 16;
+            uint32_t color = AV_RN32(&s->fg[4 * ch]);
+
+            memset(s->counter, 0, sizeof(s->counter));
+            for (i = 0; i < insamples->nb_samples; i++)
+                count_bits(s, in[i], 16);
+
+            for (b = 0; b < 16; b++) {
+                for (j = 1; j < h - 1; j++) {
+                    uint8_t *dst = outpicref->data[0] + (b * h + j) * outpicref->linesize[0] + w * ch * 4;
+                    int ww = (s->counter[16 - b - 1] / (float)insamples->nb_samples) * (w - 1);
+
+                    for (i = 0; i < ww; i++) {
+                        AV_WN32(&dst[i * 4], color);
+                    }
+                }
+            }
+        }
+        break;
+    case AV_SAMPLE_FMT_S32P:
+        for (ch = 0; ch < inlink->channels; ch++) {
+            uint32_t *in = (uint32_t *)insamples->extended_data[ch];
+            int w = outpicref->width / inlink->channels;
+            int h = outpicref->height / 32;
+            uint32_t color = AV_RN32(&s->fg[4 * ch]);
+
+            memset(s->counter, 0, sizeof(s->counter));
+            for (i = 0; i < insamples->nb_samples; i++)
+                count_bits(s, in[i], 32);
+
+            for (b = 0; b < 32; b++) {
+                for (j = 1; j < h - 1; j++) {
+                    uint8_t *dst = outpicref->data[0] + (b * h + j) * outpicref->linesize[0] + w * ch * 4;
+                    int ww = (s->counter[32 - b - 1] / (float)insamples->nb_samples) * (w - 1);
+
+                    for (i = 0; i < ww; i++) {
+                        AV_WN32(&dst[i * 4], color);
+                    }
+                }
+            }
+        }
+        break;
+    }
+
+    av_frame_free(&insamples);
+
+    return ff_filter_frame(outlink, outpicref);
+}
+
+static const AVFilterPad inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_AUDIO,
+        .config_props = config_input,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_avf_abitscope = {
+    .name          = "abitscope",
+    .description   = NULL_IF_CONFIG_SMALL("Convert input audio to audio bit scope video output."),
+    .query_formats = query_formats,
+    .priv_size     = sizeof(AudioBitScopeContext),
+    .inputs        = inputs,
+    .outputs       = outputs,
+    .priv_class    = &abitscope_class,
+};

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  70
+#define LIBAVFILTER_VERSION_MINOR  71
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \