[FFmpeg-devel] [PATCH] lavfi: add asplit filter
Stefano Sabatini
stefasab at gmail.com
Mon Dec 26 00:08:53 CET 2011
---
doc/filters.texi | 13 +++++++++++
libavfilter/Makefile | 1 +
libavfilter/af_asplit.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++
libavfilter/allfilters.c | 1 +
4 files changed, 70 insertions(+), 0 deletions(-)
create mode 100644 libavfilter/af_asplit.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 699e0c1..1cb8a4f 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -224,6 +224,19 @@ expressed in the form "[@var{c0} @var{c1} @var{c2} @var{c3} @var{c4} @var{c5}
@var{c6} @var{c7}]"
@end table
+ at section asplit
+
+Pass on the input audio to two outputs. Both outputs are identical to
+the input audio.
+
+For example:
+ at example
+[in] asplit[out0], showaudio[out1]
+ at end example
+
+will create two separate outputs from the same input, one cropped and
+one padded.
+
@section earwax
Make audio easier to listen to on headphones.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 9977753..6a22867 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -29,6 +29,7 @@ OBJS-$(CONFIG_AFORMAT_FILTER) += af_aformat.o
OBJS-$(CONFIG_ANULL_FILTER) += af_anull.o
OBJS-$(CONFIG_ARESAMPLE_FILTER) += af_aresample.o
OBJS-$(CONFIG_ASHOWINFO_FILTER) += af_ashowinfo.o
+OBJS-$(CONFIG_ASPLIT_FILTER) += af_asplit.o
OBJS-$(CONFIG_EARWAX_FILTER) += af_earwax.o
OBJS-$(CONFIG_PAN_FILTER) += af_pan.o
OBJS-$(CONFIG_VOLUME_FILTER) += af_volume.o
diff --git a/libavfilter/af_asplit.c b/libavfilter/af_asplit.c
new file mode 100644
index 0000000..ec5032b
--- /dev/null
+++ b/libavfilter/af_asplit.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2011 Stefano Sabatini
+ *
+ * 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
+ * audio splitter
+ */
+
+#include "avfilter.h"
+
+static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)
+{
+ avfilter_filter_samples(inlink->dst->outputs[0],
+ avfilter_ref_buffer(insamples, ~AV_PERM_WRITE));
+ avfilter_filter_samples(inlink->dst->outputs[1],
+ avfilter_ref_buffer(insamples, ~AV_PERM_WRITE));
+ avfilter_unref_buffer(insamples);
+}
+
+AVFilter avfilter_af_asplit = {
+ .name = "asplit",
+ .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to two outputs."),
+
+ .inputs = (const AVFilterPad[]) {
+ { .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .get_audio_buffer = avfilter_null_get_audio_buffer,
+ .filter_samples = filter_samples, },
+ { .name = NULL}
+ },
+ .outputs = (const AVFilterPad[]) {
+ { .name = "output1",
+ .type = AVMEDIA_TYPE_AUDIO, },
+ { .name = "output2",
+ .type = AVMEDIA_TYPE_AUDIO, },
+ { .name = NULL}
+ },
+};
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 0b641c7..530eceb 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -39,6 +39,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (ANULL, anull, af);
REGISTER_FILTER (ARESAMPLE, aresample, af);
REGISTER_FILTER (ASHOWINFO, ashowinfo, af);
+ REGISTER_FILTER (ASPLIT, asplit, af);
REGISTER_FILTER (EARWAX, earwax, af);
REGISTER_FILTER (PAN, pan, af);
REGISTER_FILTER (VOLUME, volume, af);
--
1.7.5.4
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