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110 lines
3.1 KiB
C
110 lines
3.1 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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*
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* gstsinesrc.h:
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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_AUDIO_TEST_SRC_H__
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#define __GST_AUDIO_TEST_SRC_H__
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#include <gst/gst.h>
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#include <gst/base/gstbasesrc.h>
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G_BEGIN_DECLS
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#define GST_TYPE_AUDIO_TEST_SRC \
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(gst_audio_test_src_get_type())
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#define GST_AUDIO_TEST_SRC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_TEST_SRC,GstAudioTestSrc))
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#define GST_AUDIO_TEST_SRC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_TEST_SRC,GstAudioTestSrcClass))
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#define GST_IS_AUDIO_TEST_SRC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_TEST_SRC))
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#define GST_IS_AUDIO_TEST_SRC_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_TEST_SRC))
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typedef enum {
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GST_AUDIO_TEST_SRC_WAVE_SINE,
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GST_AUDIO_TEST_SRC_WAVE_SQUARE,
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GST_AUDIO_TEST_SRC_WAVE_SAW,
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GST_AUDIO_TEST_SRC_WAVE_TRIANGLE,
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GST_AUDIO_TEST_SRC_WAVE_SILENCE,
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GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE,
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GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE,
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} GstAudioTestSrcWaves;
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#define PINK_MAX_RANDOM_ROWS (30)
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#define PINK_RANDOM_BITS (16)
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#define PINK_RANDOM_SHIFT ((sizeof(long)*8)-PINK_RANDOM_BITS)
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typedef struct {
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glong rows[PINK_MAX_RANDOM_ROWS];
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glong running_sum; /* Used to optimize summing of generators. */
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gint index; /* Incremented each sample. */
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gint index_mask; /* Index wrapped by ANDing with this mask. */
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gfloat scalar; /* Used to scale within range of -1.0 to +1.0 */
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} GstPinkNoise;
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typedef struct _GstAudioTestSrc GstAudioTestSrc;
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typedef struct _GstAudioTestSrcClass GstAudioTestSrcClass;
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struct _GstAudioTestSrc {
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GstBaseSrc parent;
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void (*process)(GstAudioTestSrc*, gint16 *);
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/* parameters */
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GstAudioTestSrcWaves wave;
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gdouble volume;
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gdouble freq;
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/* audio parameters */
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gint samplerate;
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gint samples_per_buffer;
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guint64 timestamp;
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guint64 offset;
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gdouble accumulator;
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gboolean tags_pushed;
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GstClockID clock_id;
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GstClockTimeDiff timestamp_offset;
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/* < private > */
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/* waveform specific context data */
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GstPinkNoise pink;
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};
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struct _GstAudioTestSrcClass {
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GstBaseSrcClass parent_class;
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};
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GType gst_audio_test_src_get_type(void);
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gboolean gst_audio_test_src_factory_init (GstElementFactory *factory);
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G_END_DECLS
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#endif /* __GST_AUDIO_TEST_SRC_H__ */
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