2 * Copyright (C) 2005 Stefan Kost <ensonic@users.sf.net>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 #ifndef __GST_AUDIO_TEST_SRC_H__
21 #define __GST_AUDIO_TEST_SRC_H__
25 #include <gst/base/gstbasesrc.h>
27 #include <gst/audio/audio.h>
32 #define GST_TYPE_AUDIO_TEST_SRC \
33 (gst_audio_test_src_get_type())
34 #define GST_AUDIO_TEST_SRC(obj) \
35 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_TEST_SRC,GstAudioTestSrc))
36 #define GST_AUDIO_TEST_SRC_CLASS(klass) \
37 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_TEST_SRC,GstAudioTestSrcClass))
38 #define GST_IS_AUDIO_TEST_SRC(obj) \
39 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_TEST_SRC))
40 #define GST_IS_AUDIO_TEST_SRC_CLASS(klass) \
41 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_TEST_SRC))
44 * GstAudioTestSrcWave:
45 * @GST_AUDIO_TEST_SRC_WAVE_SINE: a sine wave
46 * @GST_AUDIO_TEST_SRC_WAVE_SQUARE: a square wave
47 * @GST_AUDIO_TEST_SRC_WAVE_SAW: a saw wave
48 * @GST_AUDIO_TEST_SRC_WAVE_TRIANGLE: a tringle wave
49 * @GST_AUDIO_TEST_SRC_WAVE_SILENCE: silence
50 * @GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE: white uniform noise
51 * @GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE: pink noise
52 * @GST_AUDIO_TEST_SRC_WAVE_SINE_TAB: sine wave using a table
53 * @GST_AUDIO_TEST_SRC_WAVE_TICKS: periodic ticks
54 * @GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE: white (zero mean) Gaussian noise; volume sets the standard deviation of the noise in units of the range of values of the sample type, e.g. volume=0.1 produces noise with a standard deviation of 0.1*32767=3277 with 16-bit integer samples, or 0.1*1.0=0.1 with floating-point samples.
55 * @GST_AUDIO_TEST_SRC_WAVE_RED_NOISE: red (brownian) noise
56 * @GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE: spectraly inverted pink noise
57 * @GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE: spectraly inverted red (brownian) noise
59 * Different types of supported sound waves.
62 GST_AUDIO_TEST_SRC_WAVE_SINE,
63 GST_AUDIO_TEST_SRC_WAVE_SQUARE,
64 GST_AUDIO_TEST_SRC_WAVE_SAW,
65 GST_AUDIO_TEST_SRC_WAVE_TRIANGLE,
66 GST_AUDIO_TEST_SRC_WAVE_SILENCE,
67 GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE,
68 GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE,
69 GST_AUDIO_TEST_SRC_WAVE_SINE_TAB,
70 GST_AUDIO_TEST_SRC_WAVE_TICKS,
71 GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE,
72 GST_AUDIO_TEST_SRC_WAVE_RED_NOISE,
73 GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE,
74 GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE
75 } GstAudioTestSrcWave;
77 #define PINK_MAX_RANDOM_ROWS (30)
78 #define PINK_RANDOM_BITS (16)
79 #define PINK_RANDOM_SHIFT ((sizeof(long)*8)-PINK_RANDOM_BITS)
82 glong rows[PINK_MAX_RANDOM_ROWS];
83 glong running_sum; /* Used to optimize summing of generators. */
84 gint index; /* Incremented each sample. */
85 gint index_mask; /* Index wrapped by ANDing with this mask. */
86 gdouble scalar; /* Used to scale within range of -1.0 to +1.0 */
90 gdouble state; /* noise state */
93 typedef struct _GstAudioTestSrc GstAudioTestSrc;
94 typedef struct _GstAudioTestSrcClass GstAudioTestSrcClass;
96 typedef void (*ProcessFunc) (GstAudioTestSrc*, guint8 *);
101 * audiotestsrc object structure.
103 struct _GstAudioTestSrc {
109 GstAudioTestSrcWave wave;
113 /* audio parameters */
115 gint samples_per_buffer;
118 gboolean tags_pushed; /* send tags just once ? */
119 GstClockTimeDiff timestamp_offset; /* base offset */
120 GstClockTime next_time; /* next timestamp */
121 gint64 next_sample; /* next sample to send */
122 gint64 next_byte; /* next byte to send */
124 gboolean check_seek_stop;
125 gboolean eos_reached;
126 gint generate_samples_per_buffer; /* used to generate a partial buffer */
127 gboolean can_activate_pull;
128 gboolean reverse; /* play backwards */
130 /* waveform specific context data */
131 GRand *gen; /* random number generator */
132 gdouble accumulator; /* phase angle */
135 gdouble wave_table[1024];
138 struct _GstAudioTestSrcClass {
139 GstBaseSrcClass parent_class;
142 GType gst_audio_test_src_get_type (void);
146 #endif /* __GST_AUDIO_TEST_SRC_H__ */