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126 lines
4.3 KiB
C
126 lines
4.3 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* Copyright (C) 2013 Sebastian Dröge <slomo@circular-chaos.org>
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*
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* gstaudiomixer.h: Header for GstAudioMixer element
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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_MIXER_H__
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#define __GST_AUDIO_MIXER_H__
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#include <gst/gst.h>
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#include <gst/base/gstaggregator.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_MIXER (gst_audiomixer_get_type())
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#define GST_AUDIO_MIXER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_MIXER,GstAudioMixer))
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#define GST_IS_AUDIO_MIXER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_MIXER))
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#define GST_AUDIO_MIXER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_MIXER,GstAudioMixerClass))
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#define GST_IS_AUDIO_MIXER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_MIXER))
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#define GST_AUDIO_MIXER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_MIXER,GstAudioMixerClass))
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typedef struct _GstAudioMixer GstAudioMixer;
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typedef struct _GstAudioMixerClass GstAudioMixerClass;
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typedef struct _GstAudioMixerPad GstAudioMixerPad;
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typedef struct _GstAudioMixerPadClass GstAudioMixerPadClass;
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/**
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* GstAudioMixer:
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*
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* The audiomixer object structure.
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*/
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struct _GstAudioMixer {
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GstAggregator element;
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/* the next are valid for both int and float */
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GstAudioInfo info;
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/* counters to keep track of timestamps */
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gint64 offset;
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/* Buffer starting at offset containing block_size samples */
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GstBuffer *current_buffer;
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/* current caps */
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GstCaps *current_caps;
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gboolean send_caps;
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/* target caps (set via property) */
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GstCaps *filter_caps;
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GstClockTime alignment_threshold;
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GstClockTime discont_wait;
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gint64 base_time;
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/* Size in samples that is output per buffer */
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guint blocksize;
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};
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struct _GstAudioMixerClass {
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GstAggregatorClass parent_class;
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};
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GType gst_audiomixer_get_type (void);
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#define GST_TYPE_AUDIO_MIXER_PAD (gst_audiomixer_pad_get_type())
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#define GST_AUDIO_MIXER_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_MIXER_PAD,GstAudioMixerPad))
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#define GST_IS_AUDIO_MIXER_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_MIXER_PAD))
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#define GST_AUDIO_MIXER_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_MIXER_PAD,GstAudioMixerPadClass))
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#define GST_IS_AUDIO_MIXER_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_MIXER_PAD))
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#define GST_AUDIO_MIXER_PAD_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_MIXER_PAD,GstAudioMixerPadClass))
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struct _GstAudioMixerPad {
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GstAggregatorPad parent;
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gdouble volume;
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gint volume_i32;
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gint volume_i16;
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gint volume_i8;
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gboolean mute;
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/* < private > */
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GstBuffer *buffer; /* current buffer we're mixing,
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for comparison with collect.buffer
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to see if we need to update our
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cached values. */
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guint position, size;
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guint64 output_offset; /* Offset in output segment that
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collect.pos refers to in the
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current buffer. */
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guint64 next_offset; /* Next expected offset in the input segment */
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/* Last time we noticed a discont */
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GstClockTime discont_time;
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};
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struct _GstAudioMixerPadClass {
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GstAggregatorPadClass parent_class;
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};
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GType gst_audiomixer_pad_get_type (void);
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G_END_DECLS
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#endif /* __GST_AUDIO_MIXER_H__ */
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