Necessary changes has been done. PFA.
Usage:
./ffmpeg -i kpg.mp3 -filter_complex peakpoints=wsize=16 -f null -
On Wed, Nov 2, 2016 at 6:14 AM, Michael Niedermayer <mich...@niedermayer.cc>
wrote:
> On Wed, Nov 02, 2016 at 05:00:09AM +0530, Pallavi Kumari wrote:
> > Hi Michael,
> >
> > I have attached a working patch with the mail. PFA.
> >
> > Usage:
> >
>
> > ./ffmpeg -i kpg.mp3 -filter_complex peakpoints=input=kpg.mp3:wsize=16
>
> I realize now, theres a mistake in this, you must provide a output
> as in
> ./ffmpeg -i kpg.mp3 -af peakpoints -f null -
>
> without some output like "-f null -" it wont read the file fully and
> wont pass it through filter_frame()
>
> you could see this failure as in:
> ./ffmpeg -i ~/videos/matrixbench_mpeg2.mpg -af volumedetect -f null -
> vs.
> ./ffmpeg -i ~/videos/matrixbench_mpeg2.mpg -af volumedetect
>
> you get the histogram from the volume detect filter in the first case
> but not the 2nd.
>
> [...]
> --
> Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Many things microsoft did are stupid, but not doing something just because
> microsoft did it is even more stupid. If everything ms did were stupid they
> would be bankrupt already.
>
From e10f73d363d0313774bcb132b3b1f2417fcfba11 Mon Sep 17 00:00:00 2001
From: Atana <at...@openmailbox.org>
Date: Thu, 3 Nov 2016 01:05:51 +0530
Subject: [PATCH] avfilter: added peakpoints filter
---
libavfilter/af_peakpoints.c | 226 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 226 insertions(+)
create mode 100644 libavfilter/af_peakpoints.c
diff --git a/libavfilter/af_peakpoints.c b/libavfilter/af_peakpoints.c
new file mode 100644
index 0000000..9265c47
--- /dev/null
+++ b/libavfilter/af_peakpoints.c
@@ -0,0 +1,226 @@
+/*
+ * Copyright (c) 2016 Atana
+ *
+ * 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 "libavcodec/avcodec.h"
+#include "libavcodec/avfft.h"
+#include "libavformat/avformat.h"
+#include "libswscale/swscale.h"
+#include "avfilter.h"
+#include "audio.h"
+#include "libavutil/opt.h"
+
+
+/* Structure to contain peak points context */
+typedef struct {
+ const AVClass *class;
+ double *data;
+ int nsamples;
+ int index;
+ double *peaks;
+ int size; // number of peaks
+ int windowSize;
+ //char *inputFile;
+} PeakPointsContext;
+
+/* returns maximum value from an array conditioned on start and end index */
+static double getMax(double *res_arr, int startIndex, int endIndex) {
+ int i;
+ double max = res_arr[startIndex];
+ for (i = startIndex; i <= endIndex; i++) {
+ if (res_arr[i] > max) {
+ max = res_arr[i];
+ }
+ }
+ return max;
+}
+
+/* Stores peak frequency for each window(of chunkSize) in peaks array */
+static void getPeakPointInChunk(int chunkSize, double *res_arr, int size, double *peaks) {
+ int i = 0, peakIndex = 0;
+ int startIndex = 0;
+ double max;
+ // get a chunk and find max value in it
+ while (i < size) {
+ if (i % chunkSize-1 == 0) {
+ max = getMax(res_arr, startIndex, i);
+ peaks[peakIndex++] = max;
+ startIndex = startIndex + chunkSize;
+ }
+ i += 1;
+ }
+}
+
+/* Get peaks points from windowed frequency domain data*/
+static int getPeakPoints(PeakPointsContext *ppc) {
+ int i, m, k, size, chunkSize, pSize, chunkSampleSize, resSize;
+ double *fft_res;
+ void *avc;
+ RDFTContext *rdftC;
+ FFTSample *data;
+
+ size = ppc->index;
+ m = log2(ppc->windowSize);
+ chunkSize = ppc->windowSize;
+ chunkSampleSize = size/chunkSize;
+ resSize = chunkSize * chunkSampleSize;
+
+ fft_res = av_malloc(sizeof(double) * resSize);
+
+ if (!fft_res) {
+ av_log(avc, AV_LOG_ERROR, "Cann't allocate memmory for storing fft data\n");
+ return 0;
+ }
+
+
+ rdftC = av_rdft_init(m, DFT_R2C);
+ data = av_malloc(sizeof(FFTSample)*chunkSize);
+
+ if (!data) {
+ av_log(avc, AV_LOG_ERROR, "Cann't allocate memmory for chunk fft data\n");
+ return 0;
+ }
+ // FFT transform for windowed time domain data
+ // window is of size chunkSize
+ k = 0;
+ while (k < resSize) {
+ //copy data
+ for (i = 0; i < chunkSize; i++) {
+ data[i] = ppc->data[i+k];
+ }
+ //calculate FFT
+ av_rdft_calc(rdftC, data);
+ for (i = 0; i < chunkSize; i++) {
+ fft_res[i+k] = data[i];
+ }
+ k = k + chunkSize;
+ }
+
+ av_rdft_end(rdftC);
+ pSize = resSize/chunkSize;
+ ppc->size = pSize;
+ ppc->peaks = av_malloc(sizeof(double)*pSize);
+
+ if (!ppc->peaks) {
+ av_log(avc, AV_LOG_ERROR, "Cann't allocate memory for peak storage\n");
+ return 0;
+ }
+
+ getPeakPointInChunk(chunkSize, fft_res, resSize, ppc->peaks);
+ return 1;
+}
+
+
+#define OFFSET(x) offsetof(PeakPointsContext, x)
+
+static const AVOption peakpoints_options[] = {
+ { "wsize", "set window size", OFFSET(windowSize), AV_OPT_TYPE_INT, {.i64=16}, 0, INT_MAX},
+ { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(peakpoints);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ PeakPointsContext *p = ctx->priv;
+
+ if (p->windowSize < 16) {
+ av_log(ctx, AV_LOG_ERROR, "window size must be greater than or equal to 16\n");
+ return AVERROR(EINVAL);
+ }
+
+ p->index = 0;
+ p->size = 0;
+ p->data = av_malloc(sizeof(double)*10000);
+
+ if (!p->data) {
+ av_log(ctx, AV_LOG_ERROR, "Cann't allocate memmory for audio data\n");
+ return AVERROR(EINVAL);
+ }
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *samples)
+{
+ AVFilterContext *ctx = inlink->dst;
+ PeakPointsContext *p = ctx->priv;
+
+ // store audio data
+ p->data[p->index] = (double)*samples->data[0];
+ p->index = p->index + 1;
+
+ return ff_filter_frame(inlink->dst->outputs[0], samples);
+}
+
+static void ppointsStats(AVFilterContext *ctx, PeakPointsContext *p) {
+ int i, ret;
+ ret = getPeakPoints(p);
+
+ if (ret && p->size) {
+ // print peaks
+ av_log(ctx, AV_LOG_INFO, "######## Peak points are ########\n");
+ for (i = 0; i < p->size; i++) {
+ av_log(ctx, AV_LOG_INFO, "%f\n", p->peaks[i]);
+ }
+ } else if (p->size || !ret) {
+ av_log(ctx, AV_LOG_ERROR, "Peak points not retrieved\n");
+ return;
+ }
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ PeakPointsContext *p = ctx->priv;
+
+ ppointsStats(ctx, p);
+
+ // free allocated memories
+ av_freep(&p->data);
+ av_freep(&p->peaks);
+}
+
+static const AVFilterPad peakpoints_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad peakpoints_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ },
+ { NULL }
+};
+
+AVFilter ff_af_peakpoints = {
+ .name = "peakpoints",
+ .description = NULL_IF_CONFIG_SMALL("peak points from frequency domain windowed data."),
+ .init = init,
+ .uninit = uninit,
+ //.query_formats = query_formats,
+ .priv_size = sizeof(PeakPointsContext),
+ .inputs = peakpoints_inputs,
+ .outputs = peakpoints_outputs,
+ .priv_class = &peakpoints_class,
+};
--
1.9.1
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