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0acb3d87bb
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
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* GStreamer
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* Copyright (C) 2016 Sebastian Dröge <sebastian@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_AUDIO_BUFFER_SPLIT_H__
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#define __GST_AUDIO_BUFFER_SPLIT_H__
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#include <gst/gst.h>
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#include <gst/base/base.h>
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#include <gst/audio/audio.h>
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G_BEGIN_DECLS
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#define GST_TYPE_AUDIO_BUFFER_SPLIT (gst_audio_buffer_split_get_type())
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#define GST_AUDIO_BUFFER_SPLIT(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_BUFFER_SPLIT,GstAudioBufferSplit))
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#define GST_IS_AUDIO_BUFFER_SPLIT(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_BUFFER_SPLIT))
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#define GST_AUDIO_BUFFER_SPLIT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_BUFFER_SPLIT,GstAudioBufferSplitClass))
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#define GST_IS_AUDIO_BUFFER_SPLIT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_BUFFER_SPLIT))
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#define GST_AUDIO_BUFFER_SPLIT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_BUFFER_SPLIT,GstAudioBufferSplitClass))
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typedef struct _GstAudioBufferSplit GstAudioBufferSplit;
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typedef struct _GstAudioBufferSplitClass GstAudioBufferSplitClass;
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struct _GstAudioBufferSplit {
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GstElement parent;
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GstPad *srcpad, *sinkpad;
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/* Properties */
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gint output_buffer_duration_n;
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gint output_buffer_duration_d;
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GstClockTime alignment_threshold;
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GstClockTime discont_wait;
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/* State */
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GstSegment segment;
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GstAudioInfo info;
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GstAdapter *adapter;
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GstClockTime discont_time; /* timestamp of last discont */
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guint64 next_offset; /* expected next input sample offset */
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GstClockTime resync_time; /* timestamp of resync after discont */
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guint64 current_offset; /* offset from start time in samples */
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guint samples_per_buffer;
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guint error_per_buffer;
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guint accumulated_error;
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};
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struct _GstAudioBufferSplitClass {
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GstElementClass parent_class;
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};
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GType gst_audio_buffer_split_get_type (void);
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G_END_DECLS
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#endif /* __GST_AUDIO_BUFFER_SPLIT_H__ */
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