--- /dev/null
+/*
+ * 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,
+};
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