gstreamer/subprojects/gst-plugins-base/gst/audiotestsrc/gstaudiotestsrc.h

142 lines
4.5 KiB
C

/* GStreamer
* Copyright (C) 2005 Stefan Kost <ensonic@users.sf.net>
*
* 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_TEST_SRC_H__
#define __GST_AUDIO_TEST_SRC_H__
#include <gst/gst.h>
#include <gst/base/gstbasesrc.h>
#include <gst/audio/audio.h>
G_BEGIN_DECLS
#define GST_TYPE_AUDIO_TEST_SRC (gst_audio_test_src_get_type())
G_DECLARE_FINAL_TYPE (GstAudioTestSrc, gst_audio_test_src, GST, AUDIO_TEST_SRC,
GstBaseSrc)
/**
* GstAudioTestSrcWave:
* @GST_AUDIO_TEST_SRC_WAVE_SINE: a sine wave
* @GST_AUDIO_TEST_SRC_WAVE_SQUARE: a square wave
* @GST_AUDIO_TEST_SRC_WAVE_SAW: a saw wave
* @GST_AUDIO_TEST_SRC_WAVE_TRIANGLE: a tringle wave
* @GST_AUDIO_TEST_SRC_WAVE_SILENCE: silence
* @GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE: white uniform noise
* @GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE: pink noise
* @GST_AUDIO_TEST_SRC_WAVE_SINE_TAB: sine wave using a table
* @GST_AUDIO_TEST_SRC_WAVE_TICKS: periodic ticks
* @GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE: white (zero mean) Gaussian noise
* @GST_AUDIO_TEST_SRC_WAVE_RED_NOISE: red (brownian) noise
* @GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE: spectraly inverted pink noise
* @GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE: spectraly inverted red (brownian) noise
*
* Different types of supported sound waves.
*/
typedef enum {
GST_AUDIO_TEST_SRC_WAVE_SINE,
GST_AUDIO_TEST_SRC_WAVE_SQUARE,
GST_AUDIO_TEST_SRC_WAVE_SAW,
GST_AUDIO_TEST_SRC_WAVE_TRIANGLE,
GST_AUDIO_TEST_SRC_WAVE_SILENCE,
GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE,
GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE,
GST_AUDIO_TEST_SRC_WAVE_SINE_TAB,
GST_AUDIO_TEST_SRC_WAVE_TICKS,
GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE,
GST_AUDIO_TEST_SRC_WAVE_RED_NOISE,
GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE,
GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE
} GstAudioTestSrcWave;
#define PINK_MAX_RANDOM_ROWS (30)
#define PINK_RANDOM_BITS (16)
#define PINK_RANDOM_SHIFT ((sizeof(long)*8)-PINK_RANDOM_BITS)
typedef struct {
glong rows[PINK_MAX_RANDOM_ROWS];
glong running_sum; /* Used to optimize summing of generators. */
gint index; /* Incremented each sample. */
gint index_mask; /* Index wrapped by ANDing with this mask. */
gdouble scalar; /* Used to scale within range of -1.0 to +1.0 */
} GstPinkNoise;
typedef struct {
gdouble state; /* noise state */
} GstRedNoise;
typedef void (*ProcessFunc) (GstAudioTestSrc*, guint8 *);
/**
* GstAudioTestSrc:
*
* audiotestsrc object structure.
*/
struct _GstAudioTestSrc {
GstBaseSrc parent;
ProcessFunc process;
GstAudioFormatPack pack_func;
gint pack_size;
gpointer tmp;
gsize tmpsize;
/* parameters */
GstAudioTestSrcWave wave;
gdouble volume;
gdouble freq;
/* audio parameters */
GstAudioInfo info;
gint samples_per_buffer;
/*< private >*/
gboolean tags_pushed; /* send tags just once ? */
GstClockTimeDiff timestamp_offset; /* base offset */
GstClockTime next_time; /* next timestamp */
gint64 next_sample; /* next sample to send */
gint64 next_byte; /* next byte to send */
gint64 sample_stop;
gboolean check_seek_stop;
gboolean eos_reached;
gint generate_samples_per_buffer; /* used to generate a partial buffer */
gboolean can_activate_pull;
gboolean reverse; /* play backwards */
/* waveform specific context data */
GRand *gen; /* random number generator */
gdouble accumulator; /* phase angle */
GstPinkNoise pink;
GstRedNoise red;
gdouble wave_table[1024];
guint sine_periods_per_tick;
guint64 tick_interval;
guint marker_tick_period;
gdouble marker_tick_volume;
gboolean apply_tick_ramp;
guint samples_between_ticks;
guint tick_counter;
};
GST_ELEMENT_REGISTER_DECLARE (audiotestsrc);
G_END_DECLS
#endif /* __GST_AUDIO_TEST_SRC_H__ */