gstreamer/gst/audiobuffersplit/gstaudiobuffersplit.h
Sebastian Dröge 0acb3d87bb 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
2016-11-23 18:18:46 +02:00

76 lines
2.6 KiB
C

/*
* 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__ */