mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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dae848818d
Rework the audio caps similar to the video caps. Remove width/depth/endianness/signed fields and replace with a simple string format and media type audio/x-raw. Create a GstAudioInfo and some helper methods to parse caps. Remove duplicate code from the ringbuffer and replace with audio info. Use AudioInfo in the base audio filter class. Port elements to new API.
145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/* GStreamer
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* Copyright (C) 2005 Stefan Kost <ensonic@users.sf.net>
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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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#include <gst/audio/audio.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(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_TEST_SRC))
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/**
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* GstAudioTestSrcWave:
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* @GST_AUDIO_TEST_SRC_WAVE_SINE: a sine wave
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* @GST_AUDIO_TEST_SRC_WAVE_SQUARE: a square wave
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* @GST_AUDIO_TEST_SRC_WAVE_SAW: a saw wave
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* @GST_AUDIO_TEST_SRC_WAVE_TRIANGLE: a tringle wave
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* @GST_AUDIO_TEST_SRC_WAVE_SILENCE: silence
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* @GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE: white uniform noise
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* @GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE: pink noise
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* @GST_AUDIO_TEST_SRC_WAVE_SINE_TAB: sine wave using a table
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* @GST_AUDIO_TEST_SRC_WAVE_TICKS: periodic ticks
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* @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.
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* @GST_AUDIO_TEST_SRC_WAVE_RED_NOISE: red (brownian) noise
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*
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* Different types of supported sound waves.
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*/
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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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GST_AUDIO_TEST_SRC_WAVE_SINE_TAB,
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GST_AUDIO_TEST_SRC_WAVE_TICKS,
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GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE,
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GST_AUDIO_TEST_SRC_WAVE_RED_NOISE,
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GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE,
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GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE
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} GstAudioTestSrcWave;
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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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gdouble scalar; /* Used to scale within range of -1.0 to +1.0 */
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} GstPinkNoise;
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typedef struct {
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gdouble state; /* noise state */
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} GstRedNoise;
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typedef struct _GstAudioTestSrc GstAudioTestSrc;
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typedef struct _GstAudioTestSrcClass GstAudioTestSrcClass;
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typedef void (*ProcessFunc) (GstAudioTestSrc*, guint8 *);
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/**
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* GstAudioTestSrc:
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*
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* audiotestsrc object structure.
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*/
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struct _GstAudioTestSrc {
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GstBaseSrc parent;
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ProcessFunc process;
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/* parameters */
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GstAudioTestSrcWave wave;
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gdouble volume;
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gdouble freq;
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/* audio parameters */
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GstAudioInfo info;
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gint samples_per_buffer;
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/*< private >*/
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gboolean tags_pushed; /* send tags just once ? */
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GstClockTimeDiff timestamp_offset; /* base offset */
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GstClockTime next_time; /* next timestamp */
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gint64 next_sample; /* next sample to send */
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gint64 next_byte; /* next byte to send */
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gint64 sample_stop;
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gboolean check_seek_stop;
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gboolean eos_reached;
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gint generate_samples_per_buffer; /* used to generate a partial buffer */
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gboolean can_activate_pull;
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gboolean reverse; /* play backwards */
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/* waveform specific context data */
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GRand *gen; /* random number generator */
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gdouble accumulator; /* phase angle */
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GstPinkNoise pink;
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GstRedNoise red;
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gdouble wave_table[1024];
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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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G_END_DECLS
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#endif /* __GST_AUDIO_TEST_SRC_H__ */
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