gstreamer/gst/audiotestsrc/gstaudiotestsrc.c
Tim-Philipp Müller d8965c30fb Const-ify GEnumValue and GFlagsValue arrays. Use
Original commit message from CVS:
* ext/pango/gsttextoverlay.c: (gst_text_overlay_valign_get_type),
(gst_text_overlay_halign_get_type),
(gst_text_overlay_wrap_mode_get_type):
* ext/theora/theoradec.c: (theora_handle_type_packet),
(theora_handle_data_packet):
* ext/theora/theoraenc.c: (gst_border_mode_get_type),
(theora_enc_sink_setcaps), (theora_enc_chain):
* gst-libs/gst/cdda/gstcddabasesrc.c:
(gst_cdda_base_src_mode_get_type):
* gst/audiotestsrc/gstaudiotestsrc.c:
(gst_audiostestsrc_wave_get_type):
* gst/playback/gststreaminfo.c: (gst_stream_type_get_type):
* gst/tcp/gstfdset.c: (gst_fdset_mode_get_type):
* gst/tcp/gstmultifdsink.c: (gst_recover_policy_get_type),
(gst_sync_method_get_type), (gst_unit_type_get_type),
(gst_client_status_get_type):
* gst/videoscale/gstvideoscale.c:
(gst_video_scale_method_get_type):
* gst/videotestsrc/gstvideotestsrc.c:
(gst_video_test_src_pattern_get_type):
* gst/videotestsrc/videotestsrc.c: (paint_setup_I420),
(paint_setup_YV12), (paint_setup_YUY2), (paint_setup_UYVY),
(paint_setup_YVYU), (paint_setup_IYU2), (paint_setup_Y41B),
(paint_setup_Y42B), (paint_setup_Y800), (paint_setup_YVU9),
(paint_setup_YUV9), (paint_setup_RGB888), (paint_setup_BGR888),
(paint_setup_RGB565), (paint_setup_xRGB1555):
Const-ify GEnumValue and GFlagsValue arrays. Use
GST_ROUND_UP_* macros instead of home-made ones.
2006-05-09 19:24:46 +00:00

782 lines
22 KiB
C

/* GStreamer
* Copyright (C) 2005 Stefan Kost <ensonic@users.sf.net>
*
* gstaudiotestsrc.c:
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-audiotestsrc
*
* <refsect2>
* AudioTestSrc can be used to generate basic audio signals. It support several
* different waveforms and allows you to set the base frequency and volume.
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch audiotestsrc ! audioconvert ! alsasink
* </programlisting>
* This pipeline produces a sine with default frequency (mid-C) and volume.
* </para>
* <para>
* <programlisting>
* gst-launch audiotestsrc wave=2 freq=200 ! audioconvert ! tee name=t ! queue ! alsasink t. ! queue ! libvisual_lv_scope ! ffmpegcolorspace ! xvimagesink
* </programlisting>
* In this example a saw wave is generated. The wave is shown using a
* scope visualizer from libvisual, allowing you to visually verify that
* the saw wave is correct.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <gst/controller/gstcontroller.h>
#include "gstaudiotestsrc.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifndef M_PI_2
#define M_PI_2 1.57079632679489661923
#endif
#define M_PI_M2 ( M_PI + M_PI )
static const GstElementDetails gst_audio_test_src_details =
GST_ELEMENT_DETAILS ("Audio test source",
"Source/Audio",
"Creates audio test signals of given frequency and volume",
"Stefan Kost <ensonic@users.sf.net>");
enum
{
PROP_0,
PROP_SAMPLES_PER_BUFFER,
PROP_WAVE,
PROP_FREQ,
PROP_VOLUME,
PROP_IS_LIVE,
PROP_TIMESTAMP_OFFSET,
};
static GstStaticPadTemplate gst_audio_test_src_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-int, "
"endianness = (int) BYTE_ORDER, "
"signed = (boolean) true, "
"width = (int) 16, "
"depth = (int) 16, " "rate = (int) [ 1, MAX ], " "channels = (int) 1")
);
GST_BOILERPLATE (GstAudioTestSrc, gst_audio_test_src, GstBaseSrc,
GST_TYPE_BASE_SRC);
#define GST_TYPE_AUDIO_TEST_SRC_WAVE (gst_audiostestsrc_wave_get_type())
static GType
gst_audiostestsrc_wave_get_type (void)
{
static GType audiostestsrc_wave_type = 0;
static const GEnumValue audiostestsrc_waves[] = {
{GST_AUDIO_TEST_SRC_WAVE_SINE, "Sine", "sine"},
{GST_AUDIO_TEST_SRC_WAVE_SQUARE, "Square", "square"},
{GST_AUDIO_TEST_SRC_WAVE_SAW, "Saw", "saw"},
{GST_AUDIO_TEST_SRC_WAVE_TRIANGLE, "Triangle", "triangle"},
{GST_AUDIO_TEST_SRC_WAVE_SILENCE, "Silence", "silence"},
{GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE, "White noise", "white-noise"},
{GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE, "Pink noise", "pink-noise"},
{GST_AUDIO_TEST_SRC_WAVE_SINE_TAB, "Sine table", "sine table"},
{0, NULL, NULL},
};
if (G_UNLIKELY (audiostestsrc_wave_type == 0)) {
audiostestsrc_wave_type = g_enum_register_static ("GstAudioTestSrcWave",
audiostestsrc_waves);
}
return audiostestsrc_wave_type;
}
static void gst_audio_test_src_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_audio_test_src_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static gboolean gst_audio_test_src_setcaps (GstBaseSrc * basesrc,
GstCaps * caps);
static void gst_audio_test_src_src_fixate (GstPad * pad, GstCaps * caps);
static gboolean gst_audio_test_src_is_seekable (GstBaseSrc * basesrc);
static gboolean gst_audio_test_src_do_seek (GstBaseSrc * basesrc,
GstSegment * segment);
static gboolean gst_audio_test_src_query (GstBaseSrc * basesrc,
GstQuery * query);
static void gst_audio_test_src_change_wave (GstAudioTestSrc * src);
static void gst_audio_test_src_get_times (GstBaseSrc * basesrc,
GstBuffer * buffer, GstClockTime * start, GstClockTime * end);
static GstFlowReturn gst_audio_test_src_create (GstBaseSrc * basesrc,
guint64 offset, guint length, GstBuffer ** buffer);
static void
gst_audio_test_src_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_audio_test_src_src_template));
gst_element_class_set_details (element_class, &gst_audio_test_src_details);
}
static void
gst_audio_test_src_class_init (GstAudioTestSrcClass * klass)
{
GObjectClass *gobject_class;
GstBaseSrcClass *gstbasesrc_class;
gobject_class = (GObjectClass *) klass;
gstbasesrc_class = (GstBaseSrcClass *) klass;
gobject_class->set_property = gst_audio_test_src_set_property;
gobject_class->get_property = gst_audio_test_src_get_property;
g_object_class_install_property (gobject_class, PROP_SAMPLES_PER_BUFFER,
g_param_spec_int ("samplesperbuffer", "Samples per buffer",
"Number of samples in each outgoing buffer",
1, G_MAXINT, 1024, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_WAVE, g_param_spec_enum ("wave", "Waveform", "Oscillator waveform", GST_TYPE_AUDIO_TEST_SRC_WAVE, /* enum type */
GST_AUDIO_TEST_SRC_WAVE_SINE, /* default value */
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, PROP_FREQ,
g_param_spec_double ("freq", "Frequency", "Frequency of test signal",
0.0, 20000.0, 440.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, PROP_VOLUME,
g_param_spec_double ("volume", "Volume", "Volume of test signal",
0.0, 1.0, 0.8, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, PROP_IS_LIVE,
g_param_spec_boolean ("is-live", "Is Live",
"Whether to act as a live source", FALSE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_TIMESTAMP_OFFSET,
g_param_spec_int64 ("timestamp-offset", "Timestamp offset",
"An offset added to timestamps set on buffers (in ns)", G_MININT64,
G_MAXINT64, 0, G_PARAM_READWRITE));
gstbasesrc_class->set_caps = GST_DEBUG_FUNCPTR (gst_audio_test_src_setcaps);
gstbasesrc_class->is_seekable =
GST_DEBUG_FUNCPTR (gst_audio_test_src_is_seekable);
gstbasesrc_class->do_seek = GST_DEBUG_FUNCPTR (gst_audio_test_src_do_seek);
gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_audio_test_src_query);
gstbasesrc_class->get_times =
GST_DEBUG_FUNCPTR (gst_audio_test_src_get_times);
gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_audio_test_src_create);
}
static void
gst_audio_test_src_init (GstAudioTestSrc * src, GstAudioTestSrcClass * g_class)
{
GstPad *pad = GST_BASE_SRC_PAD (src);
gst_pad_set_fixatecaps_function (pad, gst_audio_test_src_src_fixate);
src->samplerate = 44100;
src->volume = 1.0;
src->freq = 440.0;
/* we operate in time */
gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (src), FALSE);
src->samples_per_buffer = 1024;
src->generate_samples_per_buffer = src->samples_per_buffer;
src->timestamp_offset = G_GINT64_CONSTANT (0);
src->wave = GST_AUDIO_TEST_SRC_WAVE_SINE;
gst_audio_test_src_change_wave (src);
}
static void
gst_audio_test_src_src_fixate (GstPad * pad, GstCaps * caps)
{
GstAudioTestSrc *src = GST_AUDIO_TEST_SRC (GST_PAD_PARENT (pad));
GstStructure *structure;
structure = gst_caps_get_structure (caps, 0);
gst_structure_fixate_field_nearest_int (structure, "rate", src->samplerate);
}
static gboolean
gst_audio_test_src_setcaps (GstBaseSrc * basesrc, GstCaps * caps)
{
GstAudioTestSrc *src = GST_AUDIO_TEST_SRC (basesrc);
const GstStructure *structure;
gboolean ret;
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "rate", &src->samplerate);
return ret;
}
static gboolean
gst_audio_test_src_query (GstBaseSrc * basesrc, GstQuery * query)
{
GstAudioTestSrc *src = GST_AUDIO_TEST_SRC (basesrc);
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONVERT:
{
GstFormat src_fmt, dest_fmt;
gint64 src_val, dest_val;
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
if (src_fmt == dest_fmt) {
dest_val = src_val;
goto done;
}
switch (src_fmt) {
case GST_FORMAT_DEFAULT:
switch (dest_fmt) {
case GST_FORMAT_TIME:
/* samples to time */
dest_val = src_val / src->samplerate;
break;
default:
goto error;
}
break;
case GST_FORMAT_TIME:
switch (dest_fmt) {
case GST_FORMAT_DEFAULT:
/* time to samples */
dest_val = src_val * src->samplerate;
break;
default:
goto error;
}
break;
default:
goto error;
}
done:
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
res = TRUE;
break;
}
default:
res = GST_BASE_SRC_CLASS (parent_class)->query (basesrc, query);
break;
}
return res;
/* ERROR */
error:
{
GST_DEBUG_OBJECT (src, "query failed");
return FALSE;
}
}
static void
gst_audio_test_src_create_sine (GstAudioTestSrc * src, gint16 * samples)
{
gint i;
gdouble step, amp;
step = M_PI_M2 * src->freq / src->samplerate;
amp = src->volume * 32767.0;
for (i = 0; i < src->generate_samples_per_buffer; i++) {
src->accumulator += step;
if (src->accumulator >= M_PI_M2)
src->accumulator -= M_PI_M2;
samples[i] = (gint16) (sin (src->accumulator) * amp);
}
}
static void
gst_audio_test_src_create_square (GstAudioTestSrc * src, gint16 * samples)
{
gint i;
gdouble step, amp;
step = M_PI_M2 * src->freq / src->samplerate;
amp = src->volume * 32767.0;
for (i = 0; i < src->generate_samples_per_buffer; i++) {
src->accumulator += step;
if (src->accumulator >= M_PI_M2)
src->accumulator -= M_PI_M2;
samples[i] = (gint16) ((src->accumulator < M_PI) ? amp : -amp);
}
}
static void
gst_audio_test_src_create_saw (GstAudioTestSrc * src, gint16 * samples)
{
gint i;
gdouble step, amp;
step = M_PI_M2 * src->freq / src->samplerate;
amp = (src->volume * 32767.0) / M_PI;
for (i = 0; i < src->generate_samples_per_buffer; i++) {
src->accumulator += step;
if (src->accumulator >= M_PI_M2)
src->accumulator -= M_PI_M2;
if (src->accumulator < M_PI) {
samples[i] = (gint16) (src->accumulator * amp);
} else {
samples[i] = (gint16) ((M_PI_M2 - src->accumulator) * -amp);
}
}
}
static void
gst_audio_test_src_create_triangle (GstAudioTestSrc * src, gint16 * samples)
{
gint i;
gdouble step, amp;
step = M_PI_M2 * src->freq / src->samplerate;
amp = (src->volume * 32767.0) / M_PI_2;
for (i = 0; i < src->generate_samples_per_buffer; i++) {
src->accumulator += step;
if (src->accumulator >= M_PI_M2)
src->accumulator -= M_PI_M2;
if (src->accumulator < (M_PI * 0.5)) {
samples[i] = (gint16) (src->accumulator * amp);
} else if (src->accumulator < (M_PI * 1.5)) {
samples[i] = (gint16) ((src->accumulator - M_PI) * -amp);
} else {
samples[i] = (gint16) ((M_PI_M2 - src->accumulator) * -amp);
}
}
}
static void
gst_audio_test_src_create_silence (GstAudioTestSrc * src, gint16 * samples)
{
memset (samples, 0, src->generate_samples_per_buffer * sizeof (gint16));
}
static void
gst_audio_test_src_create_white_noise (GstAudioTestSrc * src, gint16 * samples)
{
gint i;
gdouble amp;
amp = src->volume * 65535.0;
for (i = 0; i < src->generate_samples_per_buffer; i++) {
samples[i] = (gint16) (32768 - (amp * rand () / (RAND_MAX + 1.0)));
}
}
/* pink noise calculation is based on
* http://www.firstpr.com.au/dsp/pink-noise/phil_burk_19990905_patest_pink.c
* which has been released under public domain
* Many thanks Phil!
*/
static void
gst_audio_test_src_init_pink_noise (GstAudioTestSrc * src)
{
gint i;
gint num_rows = 12; /* arbitrary: 1 .. PINK_MAX_RANDOM_ROWS */
glong pmax;
src->pink.index = 0;
src->pink.index_mask = (1 << num_rows) - 1;
/* calculate maximum possible signed random value.
* Extra 1 for white noise always added. */
pmax = (num_rows + 1) * (1 << (PINK_RANDOM_BITS - 1));
src->pink.scalar = 1.0f / pmax;
/* Initialize rows. */
for (i = 0; i < num_rows; i++)
src->pink.rows[i] = 0;
src->pink.running_sum = 0;
}
/* Generate Pink noise values between -1.0 and +1.0 */
static gfloat
gst_audio_test_src_generate_pink_noise_value (GstPinkNoise * pink)
{
glong new_random;
glong sum;
/* Increment and mask index. */
pink->index = (pink->index + 1) & pink->index_mask;
/* If index is zero, don't update any random values. */
if (pink->index != 0) {
/* Determine how many trailing zeros in PinkIndex. */
/* This algorithm will hang if n==0 so test first. */
gint num_zeros = 0;
gint n = pink->index;
while ((n & 1) == 0) {
n = n >> 1;
num_zeros++;
}
/* Replace the indexed ROWS random value.
* Subtract and add back to RunningSum instead of adding all the random
* values together. Only one changes each time.
*/
pink->running_sum -= pink->rows[num_zeros];
//new_random = ((glong)GenerateRandomNumber()) >> PINK_RANDOM_SHIFT;
new_random = 32768.0 - (65536.0 * (gulong) rand () / (RAND_MAX + 1.0));
pink->running_sum += new_random;
pink->rows[num_zeros] = new_random;
}
/* Add extra white noise value. */
new_random = 32768.0 - (65536.0 * (gulong) rand () / (RAND_MAX + 1.0));
sum = pink->running_sum + new_random;
/* Scale to range of -1.0 to 0.9999. */
return (pink->scalar * sum);
}
static void
gst_audio_test_src_create_pink_noise (GstAudioTestSrc * src, gint16 * samples)
{
gint i;
gdouble amp;
amp = src->volume * 32767.0;
for (i = 0; i < src->generate_samples_per_buffer; i++) {
samples[i] =
(gint16) (gst_audio_test_src_generate_pink_noise_value (&src->pink) *
amp);
}
}
static void
gst_audio_test_src_init_sine_table (GstAudioTestSrc * src)
{
gint i;
gdouble ang = 0.0;
gdouble step = M_PI_M2 / 1024.0;
gdouble amp = src->volume * 32767.0;
for (i = 0; i < 1024; i++) {
src->wave_table[i] = (gint16) (sin (ang) * amp);
ang += step;
}
}
static void
gst_audio_test_src_create_sine_table (GstAudioTestSrc * src, gint16 * samples)
{
gint i;
gdouble step, scl;
step = M_PI_M2 * src->freq / src->samplerate;
scl = 1024.0 / M_PI_M2;
for (i = 0; i < src->generate_samples_per_buffer; i++) {
src->accumulator += step;
if (src->accumulator >= M_PI_M2)
src->accumulator -= M_PI_M2;
samples[i] = src->wave_table[(gint) (src->accumulator * scl)];
}
}
/*
* gst_audio_test_src_change_wave:
* Assign function pointer of wave genrator.
*/
static void
gst_audio_test_src_change_wave (GstAudioTestSrc * src)
{
switch (src->wave) {
case GST_AUDIO_TEST_SRC_WAVE_SINE:
src->process = gst_audio_test_src_create_sine;
break;
case GST_AUDIO_TEST_SRC_WAVE_SQUARE:
src->process = gst_audio_test_src_create_square;
break;
case GST_AUDIO_TEST_SRC_WAVE_SAW:
src->process = gst_audio_test_src_create_saw;
break;
case GST_AUDIO_TEST_SRC_WAVE_TRIANGLE:
src->process = gst_audio_test_src_create_triangle;
break;
case GST_AUDIO_TEST_SRC_WAVE_SILENCE:
src->process = gst_audio_test_src_create_silence;
break;
case GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE:
src->process = gst_audio_test_src_create_white_noise;
break;
case GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE:
gst_audio_test_src_init_pink_noise (src);
src->process = gst_audio_test_src_create_pink_noise;
break;
case GST_AUDIO_TEST_SRC_WAVE_SINE_TAB:
gst_audio_test_src_init_sine_table (src);
src->process = gst_audio_test_src_create_sine_table;
break;
default:
GST_ERROR ("invalid wave-form");
break;
}
}
/*
* gst_audio_test_src_change_volume:
* Recalc wave tables for precalculated waves.
*/
static void
gst_audio_test_src_change_volume (GstAudioTestSrc * src)
{
switch (src->wave) {
case GST_AUDIO_TEST_SRC_WAVE_SINE_TAB:
gst_audio_test_src_init_sine_table (src);
break;
default:
break;
}
}
static void
gst_audio_test_src_get_times (GstBaseSrc * basesrc, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end)
{
/* for live sources, sync on the timestamp of the buffer */
if (gst_base_src_is_live (basesrc)) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
/* get duration to calculate end time */
GstClockTime duration = GST_BUFFER_DURATION (buffer);
if (GST_CLOCK_TIME_IS_VALID (duration)) {
*end = timestamp + duration;
}
*start = timestamp;
}
} else {
*start = -1;
*end = -1;
}
}
static gboolean
gst_audio_test_src_do_seek (GstBaseSrc * basesrc, GstSegment * segment)
{
GstAudioTestSrc *src = GST_AUDIO_TEST_SRC (basesrc);
GstClockTime time;
time = segment->time = segment->start;
/* now move to the time indicated */
src->n_samples = time * src->samplerate / GST_SECOND;
src->running_time = src->n_samples * GST_SECOND / src->samplerate;
g_assert (src->running_time <= time);
if (GST_CLOCK_TIME_IS_VALID (segment->stop)) {
time = segment->stop;
src->n_samples_stop = time * src->samplerate / GST_SECOND;
src->check_seek_stop = TRUE;
} else {
src->check_seek_stop = FALSE;
}
src->eos_reached = FALSE;
return TRUE;
}
static gboolean
gst_audio_test_src_is_seekable (GstBaseSrc * basesrc)
{
/* we're seekable... */
return TRUE;
}
static GstFlowReturn
gst_audio_test_src_create (GstBaseSrc * basesrc, guint64 offset,
guint length, GstBuffer ** buffer)
{
GstFlowReturn res;
GstAudioTestSrc *src;
GstBuffer *buf;
GstClockTime next_time;
gint64 n_samples;
src = GST_AUDIO_TEST_SRC (basesrc);
if (src->eos_reached)
return GST_FLOW_UNEXPECTED;
/* example for tagging generated data */
if (!src->tags_pushed) {
GstTagList *taglist;
GstEvent *event;
taglist = gst_tag_list_new ();
gst_tag_list_add (taglist, GST_TAG_MERGE_APPEND,
GST_TAG_DESCRIPTION, "audiotest wave", NULL);
event = gst_event_new_tag (taglist);
gst_pad_push_event (basesrc->srcpad, event);
src->tags_pushed = TRUE;
}
/* check for eos */
if (src->check_seek_stop &&
(src->n_samples_stop > src->n_samples) &&
(src->n_samples_stop < src->n_samples + src->samples_per_buffer)
) {
/* calculate only partial buffer */
src->generate_samples_per_buffer = src->n_samples_stop - src->n_samples;
n_samples = src->n_samples_stop;
src->eos_reached = TRUE;
} else {
/* calculate full buffer */
src->generate_samples_per_buffer = src->samples_per_buffer;
n_samples = src->n_samples + src->samples_per_buffer;
}
next_time = gst_util_uint64_scale (n_samples, GST_SECOND,
(guint64) src->samplerate);
/* allocate a new buffer suitable for this pad */
if ((res = gst_pad_alloc_buffer (basesrc->srcpad, src->n_samples,
src->generate_samples_per_buffer * sizeof (gint16),
GST_PAD_CAPS (basesrc->srcpad), &buf)) != GST_FLOW_OK) {
return res;
}
GST_BUFFER_TIMESTAMP (buf) = src->timestamp_offset + src->running_time;
GST_BUFFER_OFFSET_END (buf) = n_samples;
GST_BUFFER_DURATION (buf) = next_time - src->running_time;
gst_object_sync_values (G_OBJECT (src), src->running_time);
src->running_time = next_time;
src->n_samples = n_samples;
src->process (src, (gint16 *) GST_BUFFER_DATA (buf));
*buffer = buf;
return GST_FLOW_OK;
}
static void
gst_audio_test_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAudioTestSrc *src = GST_AUDIO_TEST_SRC (object);
switch (prop_id) {
case PROP_SAMPLES_PER_BUFFER:
src->samples_per_buffer = g_value_get_int (value);
break;
case PROP_WAVE:
src->wave = g_value_get_enum (value);
gst_audio_test_src_change_wave (src);
break;
case PROP_FREQ:
src->freq = g_value_get_double (value);
break;
case PROP_VOLUME:
src->volume = g_value_get_double (value);
gst_audio_test_src_change_volume (src);
break;
case PROP_IS_LIVE:
gst_base_src_set_live (GST_BASE_SRC (src), g_value_get_boolean (value));
break;
case PROP_TIMESTAMP_OFFSET:
src->timestamp_offset = g_value_get_int64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_audio_test_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAudioTestSrc *src = GST_AUDIO_TEST_SRC (object);
switch (prop_id) {
case PROP_SAMPLES_PER_BUFFER:
g_value_set_int (value, src->samples_per_buffer);
break;
case PROP_WAVE:
g_value_set_enum (value, src->wave);
break;
case PROP_FREQ:
g_value_set_double (value, src->freq);
break;
case PROP_VOLUME:
g_value_set_double (value, src->volume);
break;
case PROP_IS_LIVE:
g_value_set_boolean (value, gst_base_src_is_live (GST_BASE_SRC (src)));
break;
case PROP_TIMESTAMP_OFFSET:
g_value_set_int64 (value, src->timestamp_offset);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
/* initialize gst controller library */
gst_controller_init (NULL, NULL);
return gst_element_register (plugin, "audiotestsrc",
GST_RANK_NONE, GST_TYPE_AUDIO_TEST_SRC);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"audiotestsrc",
"Creates audio test signals of given frequency and volume",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);