avfilter: add ahistogram multimedia filter

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

4 files changed, 414 insertions, 1 deletions

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 9257a92284..e3e3561933 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -280,6 +280,7 @@ OBJS-$(CONFIG_NULLSINK_FILTER)               += vsink_nullsink.o
 
 # multimedia filters
 OBJS-$(CONFIG_ADRAWGRAPH_FILTER)             += f_drawgraph.o
+OBJS-$(CONFIG_AHISTOGRAM_FILTER)             += avf_ahistogram.o
 OBJS-$(CONFIG_APHASEMETER_FILTER)            += avf_aphasemeter.o
 OBJS-$(CONFIG_AVECTORSCOPE_FILTER)           += avf_avectorscope.o
 OBJS-$(CONFIG_CONCAT_FILTER)                 += avf_concat.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index d4815d6585..1faf39301a 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -300,6 +300,7 @@ void avfilter_register_all(void)
 
     /* multimedia filters */
     REGISTER_FILTER(ADRAWGRAPH,     adrawgraph,     avf);
+    REGISTER_FILTER(AHISTOGRAM,     ahistogram,     avf);
     REGISTER_FILTER(APHASEMETER,    aphasemeter,    avf);
     REGISTER_FILTER(AVECTORSCOPE,   avectorscope,   avf);
     REGISTER_FILTER(CONCAT,         concat,         avf);
diff --git a/libavfilter/avf_ahistogram.c b/libavfilter/avf_ahistogram.c
new file mode 100644
index 0000000000..55f7462676
--- /dev/null
+++ b/libavfilter/avf_ahistogram.c
@@ -0,0 +1,411 @@
+/*
+ * Copyright (c) 2015 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/opt.h"
+#include "libavutil/parseutils.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "audio.h"
+#include "video.h"
+#include "internal.h"
+
+enum DisplayScale   { LINEAR, SQRT, CBRT, LOG, RLOG, NB_SCALES };
+enum AmplitudeScale { ALINEAR, ALOG, NB_ASCALES };
+enum SlideMode      { REPLACE, SCROLL, NB_SLIDES };
+enum DisplayMode    { SINGLE, SEPARATE, NB_DMODES };
+enum HistogramMode  { ACCUMULATE, CURRENT, NB_HMODES };
+
+typedef struct AudioHistogramContext {
+    const AVClass *class;
+    AVFrame *out;
+    int w, h;
+    AVRational frame_rate;
+    uint64_t *achistogram;
+    uint64_t *shistogram;
+    int ascale;
+    int scale;
+    float phisto;
+    int histogram_h;
+    int apos;
+    int ypos;
+    int slide;
+    int dmode;
+    int dchannels;
+    int count;
+    int frame_count;
+    float *combine_buffer;
+    AVFrame *in[101];
+    int first;
+} AudioHistogramContext;
+
+#define OFFSET(x) offsetof(AudioHistogramContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption ahistogram_options[] = {
+    { "dmode", "set method to display channels", OFFSET(dmode), AV_OPT_TYPE_INT, {.i64=SINGLE}, 0, NB_DMODES-1, FLAGS, "dmode" },
+        { "single", "all channels use single histogram", 0, AV_OPT_TYPE_CONST, {.i64=SINGLE},   0, 0, FLAGS, "dmode" },
+        { "separate", "each channel have own histogram", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "dmode" },
+    { "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="hd720"}, 0, 0, FLAGS },
+    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, 0, 0, FLAGS },
+    { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, LINEAR, NB_SCALES-1, FLAGS, "scale" },
+        { "log",  "logarithmic",         0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },
+        { "sqrt", "square root",         0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },
+        { "cbrt", "cubic root",          0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },
+        { "lin",  "linear",              0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },
+        { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=RLOG},   0, 0, FLAGS, "scale" },
+    { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=ALOG}, LINEAR, NB_ASCALES-1, FLAGS, "ascale" },
+        { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=ALOG},    0, 0, FLAGS, "ascale" },
+        { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=ALINEAR}, 0, 0, FLAGS, "ascale" },
+    { "acount", "how much frames to accumulate", OFFSET(count), AV_OPT_TYPE_INT, {.i64=1}, -1, 100, FLAGS },
+    { "rheight", "set histogram ratio of window height", OFFSET(phisto), AV_OPT_TYPE_FLOAT, {.dbl=0.10}, 0, 1, FLAGS },
+    { "slide", "set sonogram sliding", OFFSET(slide), AV_OPT_TYPE_INT, {.i64=REPLACE}, 0, NB_SLIDES-1, FLAGS, "slide" },
+        { "replace", "replace old rows with new", 0, AV_OPT_TYPE_CONST, {.i64=REPLACE},    0, 0, FLAGS, "slide" },
+        { "scroll",  "scroll from top to bottom", 0, AV_OPT_TYPE_CONST, {.i64=SCROLL}, 0, 0, FLAGS, "slide" },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(ahistogram);
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layouts = NULL;
+    AVFilterLink *inlink = ctx->inputs[0];
+    AVFilterLink *outlink = ctx->outputs[0];
+    static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
+    static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE };
+    int ret = AVERROR(EINVAL);
+
+    formats = ff_make_format_list(sample_fmts);
+    if ((ret = ff_formats_ref         (formats, &inlink->out_formats        )) < 0 ||
+        (layouts = ff_all_channel_counts()) == NULL ||
+        (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;
+    AudioHistogramContext *s = ctx->priv;
+    int nb_samples;
+
+    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->dchannels = s->dmode == SINGLE ? 1 : inlink->channels;
+    s->shistogram = av_calloc(s->w, s->dchannels * sizeof(*s->shistogram));
+    if (!s->shistogram)
+        return AVERROR(ENOMEM);
+
+    s->achistogram = av_calloc(s->w, s->dchannels * sizeof(*s->achistogram));
+    if (!s->achistogram)
+        return AVERROR(ENOMEM);
+
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AudioHistogramContext *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;
+
+    s->histogram_h = s->h * s->phisto;
+    s->ypos = s->h * s->phisto;
+
+    if (s->dmode == SEPARATE) {
+        s->combine_buffer = av_malloc_array(outlink->w * 3, sizeof(*s->combine_buffer));
+        if (!s->combine_buffer)
+            return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AudioHistogramContext *s = ctx->priv;
+    const int H = s->histogram_h;
+    const int w = s->w;
+    int c, y, n, p, bin;
+    uint64_t acmax = 0;
+
+    if (!s->out || s->out->width  != outlink->w ||
+                   s->out->height != outlink->h) {
+        av_frame_free(&s->out);
+        s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+        if (!s->out) {
+            av_frame_free(&in);
+            return AVERROR(ENOMEM);
+        }
+        for (n = H; n < s->h; n++) {
+            memset(s->out->data[0] + n * s->out->linesize[0], 0, w);
+            memset(s->out->data[1] + n * s->out->linesize[0], 127, w);
+            memset(s->out->data[2] + n * s->out->linesize[0], 127, w);
+            memset(s->out->data[3] + n * s->out->linesize[0], 0, w);
+        }
+    }
+
+    if (s->dmode == SEPARATE) {
+        for (y = 0; y < w; y++) {
+            s->combine_buffer[3 * y    ] = 0;
+            s->combine_buffer[3 * y + 1] = 127.5;
+            s->combine_buffer[3 * y + 2] = 127.5;
+        }
+    }
+
+    for (n = 0; n < H; n++) {
+        memset(s->out->data[0] + n * s->out->linesize[0], 0, w);
+        memset(s->out->data[1] + n * s->out->linesize[0], 127, w);
+        memset(s->out->data[2] + n * s->out->linesize[0], 127, w);
+        memset(s->out->data[3] + n * s->out->linesize[0], 0, w);
+    }
+    s->out->pts = in->pts;
+
+    s->first = s->frame_count;
+
+    switch (s->ascale) {
+    case ALINEAR:
+        for (c = 0; c < inlink->channels; c++) {
+            const float *src = (const float *)in->extended_data[c];
+            uint64_t *achistogram = &s->achistogram[(s->dmode == SINGLE ? 0: c) * w];
+
+            for (n = 0; n < in->nb_samples; n++) {
+                bin = lrint(av_clipf(fabsf(src[n]), 0, 1) * (w - 1));
+
+                achistogram[bin]++;
+            }
+
+            if (s->in[s->first] && s->count >= 0) {
+                uint64_t *shistogram = &s->shistogram[(s->dmode == SINGLE ? 0: c) * w];
+                const float *src2 = (const float *)s->in[s->first]->extended_data[c];
+
+                for (n = 0; n < in->nb_samples; n++) {
+                    bin = lrint(av_clipf(fabsf(src2[n]), 0, 1) * (w - 1));
+
+                    shistogram[bin]++;
+                }
+            }
+        }
+        break;
+    case ALOG:
+        for (c = 0; c < inlink->channels; c++) {
+            const float *src = (const float *)in->extended_data[c];
+            uint64_t *achistogram = &s->achistogram[(s->dmode == SINGLE ? 0: c) * w];
+
+            for (n = 0; n < in->nb_samples; n++) {
+                bin = lrint(av_clipf(1 + log10(fabsf(src[n])) / 6, 0, 1) * (w - 1));
+
+                achistogram[bin]++;
+            }
+
+            if (s->in[s->first] && s->count >= 0) {
+                uint64_t *shistogram = &s->shistogram[(s->dmode == SINGLE ? 0: c) * w];
+                const float *src2 = (const float *)s->in[s->first]->extended_data[c];
+
+                for (n = 0; n < in->nb_samples; n++) {
+                    bin = lrint(av_clipf(1 + log10(fabsf(src2[n])) / 6, 0, 1) * (w - 1));
+
+                    shistogram[bin]++;
+                }
+            }
+        }
+        break;
+    }
+
+    av_frame_free(&s->in[s->frame_count]);
+    s->in[s->frame_count] = in;
+    s->frame_count++;
+    if (s->frame_count > s->count)
+        s->frame_count = 0;
+
+    for (n = 0; n < w * s->dchannels; n++) {
+        acmax = FFMAX(s->achistogram[n] - s->shistogram[n], acmax);
+    }
+
+    for (c = 0; c < s->dchannels; c++) {
+        uint64_t *shistogram  = &s->shistogram[c * w];
+        uint64_t *achistogram = &s->achistogram[c * w];
+        float yf, uf, vf;
+
+        if (s->dmode == SEPARATE) {
+            yf = 256.0f / s->dchannels;
+            uf = yf * M_PI;
+            vf = yf * M_PI;
+            uf *= 0.5 * sin((2 * M_PI * c) / s->dchannels);
+            vf *= 0.5 * cos((2 * M_PI * c) / s->dchannels);
+        }
+
+        for (n = 0; n < w; n++) {
+            double a, aa;
+            int h;
+
+            a = achistogram[n] - shistogram[n];
+
+            switch (s->scale) {
+            case LINEAR:
+                aa = a / (double)acmax;
+                break;
+            case SQRT:
+                aa = sqrt(a) / sqrt(acmax);
+                break;
+            case CBRT:
+                aa = cbrt(a) / cbrt(acmax);
+                break;
+            case LOG:
+                aa = log2(a + 1) / log2(acmax + 1);
+                break;
+            case RLOG:
+                aa = 1. - log2(a + 1) / log2(acmax + 1);
+                if (aa == 1.)
+                    aa = 0;
+                break;
+            }
+
+            h = aa * (H - 1);
+
+            if (s->dmode == SINGLE) {
+
+                for (y = H - h; y < H; y++) {
+                    s->out->data[0][y * s->out->linesize[0] + n] = 255;
+                    s->out->data[3][y * s->out->linesize[0] + n] = 255;
+                }
+
+                if (s->h - H > 0) {
+                    h = aa * 255;
+
+                    s->out->data[0][s->ypos * s->out->linesize[0] + n] = h;
+                    s->out->data[1][s->ypos * s->out->linesize[1] + n] = 127;
+                    s->out->data[2][s->ypos * s->out->linesize[2] + n] = 127;
+                    s->out->data[3][s->ypos * s->out->linesize[3] + n] = 255;
+                }
+            } else if (s->dmode == SEPARATE) {
+                float *out = &s->combine_buffer[3 * n];
+                int old;
+
+                old = s->out->data[0][(H - h) * s->out->linesize[0] + n];
+                for (y = H - h; y < H; y++) {
+                    if (s->out->data[0][y * s->out->linesize[0] + n] != old)
+                        break;
+                    old = s->out->data[0][y * s->out->linesize[0] + n];
+                    s->out->data[0][y * s->out->linesize[0] + n] = yf;
+                    s->out->data[1][y * s->out->linesize[1] + n] = 128+uf;
+                    s->out->data[2][y * s->out->linesize[2] + n] = 128+vf;
+                    s->out->data[3][y * s->out->linesize[3] + n] = 255;
+                }
+
+                out[0] += aa * yf;
+                out[1] += aa * uf;
+                out[2] += aa * vf;
+            }
+        }
+    }
+
+    if (s->h - H > 0) {
+        if (s->dmode == SEPARATE) {
+            for (n = 0; n < w; n++) {
+                float *cb = &s->combine_buffer[3 * n];
+
+                s->out->data[0][s->ypos * s->out->linesize[0] + n] = cb[0];
+                s->out->data[1][s->ypos * s->out->linesize[1] + n] = cb[1];
+                s->out->data[2][s->ypos * s->out->linesize[2] + n] = cb[2];
+                s->out->data[3][s->ypos * s->out->linesize[3] + n] = 255;
+            }
+        }
+
+        if (s->slide == SCROLL) {
+            for (p = 0; p < 4; p++) {
+                for (y = s->h; y >= H + 1; y--) {
+                    memmove(s->out->data[p] + (y  ) * s->out->linesize[p],
+                            s->out->data[p] + (y-1) * s->out->linesize[p], w);
+                }
+            }
+        }
+
+        s->ypos++;
+        if (s->slide == SCROLL || s->ypos >= s->h)
+            s->ypos = H;
+    }
+
+    return ff_filter_frame(outlink, av_frame_clone(s->out));
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    AudioHistogramContext *s = ctx->priv;
+    int i;
+
+    av_frame_free(&s->out);
+    av_freep(&s->shistogram);
+    av_freep(&s->achistogram);
+    av_freep(&s->combine_buffer);
+    for (i = 0; i < 101; i++)
+        av_frame_free(&s->in[i]);
+}
+
+static const AVFilterPad audiovectorscope_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_AUDIO,
+        .config_props = config_input,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad audiovectorscope_outputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_avf_ahistogram = {
+    .name          = "ahistogram",
+    .description   = NULL_IF_CONFIG_SMALL("Convert input audio to histogram video output."),
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .priv_size     = sizeof(AudioHistogramContext),
+    .inputs        = audiovectorscope_inputs,
+    .outputs       = audiovectorscope_outputs,
+    .priv_class    = &ahistogram_class,
+};
diff --git a/libavfilter/version.h b/libavfilter/version.h
index d13929ed33..d1f3802b68 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  24
+#define LIBAVFILTER_VERSION_MINOR  25
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \