From d15553e52b9723651bb368264d86d0c5ec414f7a Mon Sep 17 00:00:00 2001
From: Dmytro Humeniuk <dmitry.gumenyuk@gmail.com>
Date: Fri, 12 Jan 2018 23:48:23 +0100
Subject: [PATCH] avfilter: add dumpwave filter.

Signed-off-by: Dmytro Humeniuk <dmitry.gumenyuk@gmail.com>
---
 Changelog                            |   1 +
 doc/filters.texi                     |  22 ++++
 libavfilter/Makefile                 |   1 +
 libavfilter/af_dumpwave.c            | 233 +++++++++++++++++++++++++++++++++++
 libavfilter/allfilters.c             |   1 +
 libavfilter/version.h                |   4 +-
 tests/fate/filter-audio.mak          |  13 ++
 tests/ref/fate/filter-dumpwave       |   1 +
 tests/ref/fate/filter-dumpwave-24bit |   1 +
 tests/ref/fate/filter-dumpwave-fltp  |   1 +
 10 files changed, 276 insertions(+), 2 deletions(-)
 create mode 100644 libavfilter/af_dumpwave.c
 create mode 100644 tests/ref/fate/filter-dumpwave
 create mode 100644 tests/ref/fate/filter-dumpwave-24bit
 create mode 100644 tests/ref/fate/filter-dumpwave-fltp

diff --git a/Changelog b/Changelog
index 61075b3392..40fd624449 100644
--- a/Changelog
+++ b/Changelog
@@ -38,6 +38,7 @@ version <next>:
 - Removed the ffserver program
 - Removed the ffmenc and ffmdec muxer and demuxer
 - VideoToolbox HEVC encoder and hwaccel
+- dumpwave audio filter
 
 
 version 3.4:
diff --git a/doc/filters.texi b/doc/filters.texi
index bd93e0ab84..bd49a8ec91 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2538,6 +2538,28 @@ Optional. It should have a value much less than 1 (e.g. 0.05 or 0.02) and is
 used to prevent clipping.
 @end table
 
+@section dumpwave
+Dump RMS envelope to a file.
+Convert samples to decibels and calculates RMS (Root-Mean-Square) audio power in 0 to 1.0 floats.
+
+@table @option
+@item w, width
+Number of data values.
+The default value is @var{1800}
+
+@item n, nb_samples
+Samples count per value per channel, default 128
+
+@item f, file
+Path to a file
+@end table
+
+For example, to generate RMS envelope for 44.1 kHz 6 seconds length audio
+with dimensions @var{1800x140}, samples count @code{44100*6/1800=147} and store it to @var{/tmp/out.csv}, you might use:
+@example
+dumpwave=w=1800:n=147:f=/tmp/out.csv
+@end example
+
 @section dynaudnorm
 Dynamic Audio Normalizer.
 
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index ef4729dd3f..2ffbc9497a 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -87,6 +87,7 @@ OBJS-$(CONFIG_COMPENSATIONDELAY_FILTER)      += af_compensationdelay.o
 OBJS-$(CONFIG_CROSSFEED_FILTER)              += af_crossfeed.o
 OBJS-$(CONFIG_CRYSTALIZER_FILTER)            += af_crystalizer.o
 OBJS-$(CONFIG_DCSHIFT_FILTER)                += af_dcshift.o
+OBJS-$(CONFIG_DUMPWAVE_FILTER)               += af_dumpwave.o
 OBJS-$(CONFIG_DYNAUDNORM_FILTER)             += af_dynaudnorm.o
 OBJS-$(CONFIG_EARWAX_FILTER)                 += af_earwax.o
 OBJS-$(CONFIG_EBUR128_FILTER)                += f_ebur128.o
diff --git a/libavfilter/af_dumpwave.c b/libavfilter/af_dumpwave.c
new file mode 100644
index 0000000000..3d1653d8de
--- /dev/null
+++ b/libavfilter/af_dumpwave.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright (c) 2017 Dmytro Humeniuk
+ *
+ * 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
+ * waveform audio filter – dump RMS amplitude to file
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/channel_layout.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavformat/avio.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "audio.h"
+#include "internal.h"
+
+typedef struct DumpWaveContext {
+    const AVClass *class;   /**< class for AVOptions */
+    int width;              /**< number of data values */
+    int idx;                /**< index of current value */
+    char *filename;         /**< output filename */
+    float *values;          /**< scaling factors */
+    int64_t nb_samples;     /**< samples per value per channel */
+    int64_t count;          /**< current number of samples counted */
+    int64_t frame_size;     /**< samples per value */
+    double sum;             /**< sum of the squared samples per value */
+    double max_value;       /**< keep track of max value */
+    FILE *dump_fp;
+} DumpWaveContext;
+
+#define OFFSET(x) offsetof(DumpWaveContext, x)
+#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption dumpwave_options[] = {
+    { "w", "set number of data values",  OFFSET(width), AV_OPT_TYPE_INT,  {.i64 = 1800}, 1, INT_MAX, FLAGS },
+    { "width", "set number of data values",  OFFSET(width), AV_OPT_TYPE_INT,  {.i64 = 1800}, 1, INT_MAX, FLAGS },
+    { "n", "set number of samples per value per channel",  OFFSET(nb_samples), AV_OPT_TYPE_INT64,  {.i64 = 128}, 1, INT64_MAX, FLAGS },
+    { "nb_samples", "set number of samples per value per channel",  OFFSET(nb_samples), AV_OPT_TYPE_INT64,  {.i64 = 128}, 1, INT64_MAX, FLAGS },
+    { "f", "set dump file", OFFSET(filename), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
+    { "file", "set dump file", OFFSET(filename), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(dumpwave);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    DumpWaveContext *dumpwave = ctx->priv;
+    
+    dumpwave->sum = dumpwave->idx = dumpwave->count = 0;
+    
+    if (!dumpwave->filename) {
+        av_log(ctx, AV_LOG_ERROR, "No output file provided\n");
+        return AVERROR(EINVAL);
+    } else {
+        dumpwave->dump_fp = fopen(dumpwave->filename, "w");
+        if (!dumpwave->dump_fp) {
+            int err = AVERROR(errno);
+            char buf[128];
+            av_strerror(err, buf, sizeof(buf));
+            av_log(ctx, AV_LOG_ERROR, "Could not open file %s: %s\n",
+                   dumpwave->filename, buf);
+            return err;
+        }
+    }
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    DumpWaveContext *dumpwave = ctx->priv;
+    fclose(dumpwave->dump_fp);
+    av_freep(&dumpwave->values);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVSampleFormat sample_fmts[] = {
+        AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
+        AV_SAMPLE_FMT_NONE
+    };
+    AVFilterFormats *formats;
+    AVFilterChannelLayouts *layouts;
+    int ret;
+    
+    if (!(formats = ff_make_format_list(sample_fmts)))
+        return AVERROR(ENOMEM);
+    
+    layouts = ff_all_channel_counts();
+    if (!layouts)
+        return AVERROR(ENOMEM);
+    ret = ff_set_common_channel_layouts(ctx, layouts);
+    if (ret < 0)
+        return ret;
+    
+    return ff_set_common_formats(ctx, formats);
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    DumpWaveContext *dumpwave = inlink->dst->priv;
+    dumpwave->frame_size = dumpwave->nb_samples * inlink->channels;
+    
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    DumpWaveContext *dumpwave = ctx->priv;
+    dumpwave->values = av_malloc(dumpwave->width * sizeof(float));
+    if (!dumpwave->values)
+        return AVERROR(ENOMEM);
+    memset(dumpwave->values, 0, dumpwave->width * sizeof(float));
+    
+    return 0;
+}
+
+static int request_frame(AVFilterLink *outlink) {
+    AVFilterContext *ctx = outlink->src;
+    DumpWaveContext *dumpwave = ctx->priv;
+    
+    AVFilterLink *inlink = ctx->inputs[0];
+    
+    int ret = ff_request_frame(inlink);
+
+    if (ret == AVERROR_EOF)
+        for (int i = 0; i < dumpwave->width; i++)
+            fprintf(dumpwave->dump_fp, (i == dumpwave->width - 1) ? "%f\n" : "%f,",
+                    av_clipf(dumpwave->values[i] / dumpwave->max_value, 0, 1.0));
+    return ret;
+}
+
+/**
+ * Convert sample to dB and calculate root mean squared value
+ */
+static inline void RMS(DumpWaveContext *dumpwave, const float sample)
+{
+    double value = 0.;
+    if (sample != 0)
+        value = (20. * log10(fabs(sample)) + 60.) / 60.;
+
+    dumpwave->sum += value * value;
+    
+    if (dumpwave->count++ == dumpwave->frame_size) {
+        value = av_clipd(sqrt(dumpwave->sum / dumpwave->frame_size), 0, 1.0);
+        dumpwave->max_value = FFMAX(value, dumpwave->max_value);
+        dumpwave->values[dumpwave->idx++] = value;
+        dumpwave->sum = dumpwave->count = 0;
+    }
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+    AVFilterContext *ctx = inlink->dst;
+    DumpWaveContext *dumpwave = ctx->priv;
+    int channels = frame->channels;
+    int c, i;
+    
+    if (dumpwave->idx < dumpwave->width)
+        switch (inlink->format) {
+            case AV_SAMPLE_FMT_FLTP:
+                for (c = 0; c < channels; c++) {
+                    const float *src = (const float *)frame->extended_data[c];
+                    
+                    for (i = 0; i < frame->nb_samples; i++, src++)
+                        RMS(dumpwave, *src);
+                }
+                break;
+            case AV_SAMPLE_FMT_FLT: {
+                const float *src = (const float *)frame->extended_data[0];
+                
+                for (i = 0; i < frame->nb_samples; i++) {
+                    for (c = 0; c < channels; c++, src++)
+                        RMS(dumpwave, *src);
+                }
+                
+            } break;
+        }
+    return ff_filter_frame(inlink->dst->outputs[0], frame);
+}
+
+static const AVFilterPad dumpwave_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_AUDIO,
+        .filter_frame = filter_frame,
+        .config_props  = config_input
+    },
+    { NULL }
+};
+
+static const AVFilterPad dumpwave_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_AUDIO,
+        .request_frame = request_frame,
+        .config_props  = config_output
+    },
+    { NULL }
+};
+
+AVFilter ff_af_dumpwave = {
+    .name          = "dumpwave",
+    .description   = NULL_IF_CONFIG_SMALL("Dump RMS amplitude to file"),
+    .init          = init,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .priv_size     = sizeof(DumpWaveContext),
+    .inputs        = dumpwave_inputs,
+    .outputs       = dumpwave_outputs,
+    .priv_class    = &dumpwave_class,
+};
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 42516bbdf9..2539ee9e9a 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -98,6 +98,7 @@ static void register_all(void)
     REGISTER_FILTER(CROSSFEED,      crossfeed,      af);
     REGISTER_FILTER(CRYSTALIZER,    crystalizer,    af);
     REGISTER_FILTER(DCSHIFT,        dcshift,        af);
+    REGISTER_FILTER(DUMPWAVE,       dumpwave,       af);
     REGISTER_FILTER(DYNAUDNORM,     dynaudnorm,     af);
     REGISTER_FILTER(EARWAX,         earwax,         af);
     REGISTER_FILTER(EBUR128,        ebur128,        af);
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 0f11721822..ca096962bb 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,8 +30,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR  11
-#define LIBAVFILTER_VERSION_MICRO 101
+#define LIBAVFILTER_VERSION_MINOR  12
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \
diff --git a/tests/fate/filter-audio.mak b/tests/fate/filter-audio.mak
index bd8b3d3c35..a0782320c0 100644
--- a/tests/fate/filter-audio.mak
+++ b/tests/fate/filter-audio.mak
@@ -340,6 +340,18 @@ fate-filter-hdcd-s32p: CMD = md5 -i $(SRC) -af hdcd -f s32le
 fate-filter-hdcd-s32p: CMP = oneline
 fate-filter-hdcd-s32p: REF = 0c5513e83eedaa10ab6fac9ddc173cf5
 
+FATE_AFILTER-$(call FILTERDEMDEC, DUMPWAVE, WAV, PCM_S16LE) += fate-filter-dumpwave
+fate-filter-dumpwave: SRC = $(TARGET_PATH)/tests/data/asynth-44100-2.wav
+fate-filter-dumpwave: CMD = ffmpeg -i $(SRC) -af dumpwave=n=147:f=$(TARGET_PATH)/tests/data/fate/filter-dumpwave.out -f null - && cat $(TARGET_PATH)/tests/data/fate/filter-dumpwave.out
+
+FATE_AFILTER-$(call FILTERDEMDEC, DUMPWAVE, TRUEHD, TRUEHD) += fate-filter-dumpwave-fltp
+fate-filter-dumpwave-fltp: SRC = $(TARGET_SAMPLES)/audiomatch/tones_afconvert_44100_stereo_aac_he2.m4a
+fate-filter-dumpwave-fltp: CMD = ffmpeg -i $(SRC) -f truehd -af dumpwave=n=52:f=$(TARGET_PATH)/tests/data/fate/filter-dumpwave-fltp.out -f null - && cat $(TARGET_PATH)/tests/data/fate/filter-dumpwave-fltp.out
+
+FATE_AFILTER-$(call FILTERDEMDEC, DUMPWAVE, FLAC, FLAC) += fate-filter-dumpwave-24bit
+fate-filter-dumpwave-24bit: SRC = $(TARGET_SAMPLES)/lossless-audio/master_audio_2.0_24bit.wma
+fate-filter-dumpwave-24bit: CMD = ffmpeg -i $(SRC) -f truehd -af dumpwave=n=51:f=$(TARGET_PATH)/tests/data/fate/filter-dumpwave-24bit.out -f null - && cat $(TARGET_PATH)/tests/data/fate/filter-dumpwave-24bit.out
+
 FATE_AFILTER-yes += fate-filter-formats
 fate-filter-formats: libavfilter/tests/formats$(EXESUF)
 fate-filter-formats: CMD = run libavfilter/tests/formats
@@ -347,3 +359,4 @@ fate-filter-formats: CMD = run libavfilter/tests/formats
 FATE_SAMPLES_AVCONV += $(FATE_AFILTER_SAMPLES-yes)
 FATE_FFMPEG += $(FATE_AFILTER-yes)
 fate-afilter: $(FATE_AFILTER-yes) $(FATE_AFILTER_SAMPLES-yes)
+
diff --git a/tests/ref/fate/filter-dumpwave b/tests/ref/fate/filter-dumpwave
new file mode 100644
index 0000000000..3267608d9c
--- /dev/null
+++ b/tests/ref/fate/filter-dumpwave
@@ -0,0 +1 @@
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diff --git a/tests/ref/fate/filter-dumpwave-24bit b/tests/ref/fate/filter-dumpwave-24bit
new file mode 100644
index 0000000000..414ce3a271
--- /dev/null
+++ b/tests/ref/fate/filter-dumpwave-24bit
@@ -0,0 +1 @@
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diff --git a/tests/ref/fate/filter-dumpwave-fltp b/tests/ref/fate/filter-dumpwave-fltp
new file mode 100644
index 0000000000..d74d4c390c
--- /dev/null
+++ b/tests/ref/fate/filter-dumpwave-fltp
@@ -0,0 +1 @@
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2.14.3 (Apple Git-98)