mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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ce94093ed4
Original commit message from CVS: Added measures and beats to the playondemand filter so it can act like an audio sequencer. Currently defines three extra globally visible functions, might eventually want to put them in an interface instead ?
138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/* -*- c-basic-offset: 2 -*-
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* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_PLAYONDEMAND_H__
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#define __GST_PLAYONDEMAND_H__
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#include <config.h>
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#include <gst/gst.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define GST_TYPE_PLAYONDEMAND \
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(gst_play_on_demand_get_type())
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#define GST_PLAYONDEMAND(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PLAYONDEMAND,GstPlayOnDemand))
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#define GST_PLAYONDEMAND_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstPlayOnDemand))
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#define GST_IS_PLAYONDEMAND(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PLAYONDEMAND))
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#define GST_IS_PLAYONDEMAND_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PLAYONDEMAND))
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typedef struct _GstPlayOnDemand GstPlayOnDemand;
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typedef struct _GstPlayOnDemandClass GstPlayOnDemandClass;
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typedef enum _GstPlayOnDemandFormat GstPlayOnDemandFormat;
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enum _GstPlayOnDemandFormat {
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GST_PLAYONDEMAND_FORMAT_INT,
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GST_PLAYONDEMAND_FORMAT_FLOAT
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};
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struct _GstPlayOnDemand {
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GstElement element;
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GstPad *sinkpad, *srcpad;
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GstBufferPool *bufpool;
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/* these next data elements are for the filter's internal buffers and list of
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play pointers (offsets in the internal buffers). there are also flags for
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repeating from the beginning or end of the input stream, and a max buffer
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size. */
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gchar *buffer;
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guint buffer_size;
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guint buffer_samples;
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guint *plays;
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guint write;
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guint start;
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gboolean play_from_beginning;
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gboolean buffer_filled_once;
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gboolean eos;
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gboolean silent;
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/* the playondemand filter needs to keep track of a number of 'measures'
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consisting of 'beats'. these are represented as an array of guint64s, with
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each guint64 being one measure, and the bits in each measure being beats
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(lower order bits come first). each measure can therefore have a maximum of
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64 beats, though there are a potentially unlimited number of measures.
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this is basically a way to figure out when incoming clock signals should
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add a play pointer. */
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GstClock *clock;
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guint last_time;
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guint64 *times;
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guint num_measures;
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guint num_beats;
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guint total_beats;
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/* the next three are valid for both int and float */
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GstPlayOnDemandFormat format;
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guint rate;
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guint channels;
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/* the next five are valid only for format == GST_PLAYONDEMAND_FORMAT_INT */
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guint width;
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guint depth;
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guint endianness;
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guint law;
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gboolean is_signed;
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/* the next three are valid only for format == GST_PLAYONDEMAND_FORMAT_FLOAT */
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const gchar *layout;
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gfloat slope;
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gfloat intercept;
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};
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struct _GstPlayOnDemandClass {
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GstElementClass parent_class;
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void (*play) (GstElement *elem);
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void (*reset) (GstElement *elem);
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};
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GType gst_play_on_demand_get_type(void);
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void gst_play_on_demand_set_beat (GstPlayOnDemand *filter,
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const guint measure,
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const guint beat,
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const gboolean value);
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gboolean gst_play_on_demand_get_beat (GstPlayOnDemand *filter,
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const guint measure,
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const guint beat);
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void gst_play_on_demand_toggle_beat (GstPlayOnDemand *filter,
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const guint measure,
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const guint beat);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_PLAYONDEMAND_H__ */
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