Commit 0acb3d87 authored by Sebastian Dröge's avatar Sebastian Dröge 🍵

audiobuffersplit: New element that splits raw audio buffers into equal-sized buffers

This is useful e.g. if audio buffers should be exactly the duration of a
video frame, or if a audio buffers should never be too large because of
latency constraints.

The element is taking a fractional buffer duration, to allow working
with e.g. 1001/30000 as output duration and it accumulates rounding
errors in the buffer durations and compensates for them by making some
buffers one sample larger than the others.

https://bugzilla.gnome.org/show_bug.cgi?id=774689
parent 12e82aac
......@@ -490,6 +490,7 @@ AG_GST_CHECK_PLUGIN(adpcmenc)
AG_GST_CHECK_PLUGIN(aiff)
AG_GST_CHECK_PLUGIN(videoframe_audiolevel)
AG_GST_CHECK_PLUGIN(asfmux)
AG_GST_CHECK_PLUGIN(audiobuffersplit)
AG_GST_CHECK_PLUGIN(audiofxbad)
AG_GST_CHECK_PLUGIN(audiomixer)
AG_GST_CHECK_PLUGIN(compositor)
......@@ -3678,6 +3679,7 @@ gst/adpcmenc/Makefile
gst/aiff/Makefile
gst/videoframe_audiolevel/Makefile
gst/asfmux/Makefile
gst/audiobuffersplit/Makefile
gst/audiofxbad/Makefile
gst/audiomixer/Makefile
gst/audiovisualizers/Makefile
......
plugin_LTLIBRARIES = libgstaudiobuffersplit.la
libgstaudiobuffersplit_la_SOURCES = gstaudiobuffersplit.c
libgstaudiobuffersplit_la_CFLAGS = $(GST_PLUGINS_BAD_CFLAGS) \
$(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) \
$(GST_CFLAGS)
libgstaudiobuffersplit_la_LIBADD = \
$(GST_PLUGINS_BASE_LIBS) -lgstaudio-$(GST_API_VERSION) \
$(GST_BASE_LIBS) $(GST_LIBS) $(LIBM)
libgstaudiobuffersplit_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstaudiobuffersplit_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)
noinst_HEADERS = gstaudiobuffersplit.h
This diff is collapsed.
/*
* GStreamer
* Copyright (C) 2016 Sebastian Dröge <sebastian@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_AUDIO_BUFFER_SPLIT_H__
#define __GST_AUDIO_BUFFER_SPLIT_H__
#include <gst/gst.h>
#include <gst/base/base.h>
#include <gst/audio/audio.h>
G_BEGIN_DECLS
#define GST_TYPE_AUDIO_BUFFER_SPLIT (gst_audio_buffer_split_get_type())
#define GST_AUDIO_BUFFER_SPLIT(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_BUFFER_SPLIT,GstAudioBufferSplit))
#define GST_IS_AUDIO_BUFFER_SPLIT(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_BUFFER_SPLIT))
#define GST_AUDIO_BUFFER_SPLIT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_BUFFER_SPLIT,GstAudioBufferSplitClass))
#define GST_IS_AUDIO_BUFFER_SPLIT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_BUFFER_SPLIT))
#define GST_AUDIO_BUFFER_SPLIT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_BUFFER_SPLIT,GstAudioBufferSplitClass))
typedef struct _GstAudioBufferSplit GstAudioBufferSplit;
typedef struct _GstAudioBufferSplitClass GstAudioBufferSplitClass;
struct _GstAudioBufferSplit {
GstElement parent;
GstPad *srcpad, *sinkpad;
/* Properties */
gint output_buffer_duration_n;
gint output_buffer_duration_d;
GstClockTime alignment_threshold;
GstClockTime discont_wait;
/* State */
GstSegment segment;
GstAudioInfo info;
GstAdapter *adapter;
GstClockTime discont_time; /* timestamp of last discont */
guint64 next_offset; /* expected next input sample offset */
GstClockTime resync_time; /* timestamp of resync after discont */
guint64 current_offset; /* offset from start time in samples */
guint samples_per_buffer;
guint error_per_buffer;
guint accumulated_error;
};
struct _GstAudioBufferSplitClass {
GstElementClass parent_class;
};
GType gst_audio_buffer_split_get_type (void);
G_END_DECLS
#endif /* __GST_AUDIO_BUFFER_SPLIT_H__ */
audiobuffersplit_sources = [
'gstaudiobuffersplit.c',
]
gstaudiobuffersplit = library('gstaudiobuffersplit',
audiobuffersplit_sources,
c_args : gst_plugins_bad_args,
include_directories : [configinc],
dependencies : [gstbase_dep, gstaudio_dep],
install : true,
install_dir : plugins_install_dir,
)
......@@ -5,6 +5,7 @@ subdir('aiff')
subdir('asfmux')
# not ported to 1.0
#subdir('audiobuffer')
subdir('audiobuffersplit')
subdir('audiofxbad')
subdir('audiomixer')
subdir('audiovisualizers')
......
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