/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * 2001 Steve Baker * * gstsinesrc.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. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "gstsinesrc.h" GstElementDetails gst_sinesrc_details = { "Sine-wave src", "Source/Audio", "Create a sine wave of a given frequency and volume", "Erik Walthinsen " }; enum { PROP_0, PROP_SAMPLES_PER_BUFFER, PROP_FREQ, PROP_VOLUME, PROP_IS_LIVE, PROP_TIMESTAMP_OFFSET, }; static GstStaticPadTemplate gst_sinesrc_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 (GstSineSrc, gst_sinesrc, GstBaseSrc, GST_TYPE_BASE_SRC); static void gst_sinesrc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_sinesrc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static gboolean gst_sinesrc_unlock (GstBaseSrc * bsrc); static gboolean gst_sinesrc_setcaps (GstBaseSrc * basesrc, GstCaps * caps); static void gst_sinesrc_src_fixate (GstPad * pad, GstCaps * caps); static const GstQueryType *gst_sinesrc_get_query_types (GstPad * pad); static gboolean gst_sinesrc_src_query (GstPad * pad, GstQuery * query); static GstFlowReturn gst_sinesrc_create (GstBaseSrc * basesrc, guint64 offset, guint length, GstBuffer ** buffer); static gboolean gst_sinesrc_start (GstBaseSrc * basesrc); static void gst_sinesrc_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_sinesrc_src_template)); gst_element_class_set_details (element_class, &gst_sinesrc_details); } static void gst_sinesrc_class_init (GstSineSrcClass * klass) { GObjectClass *gobject_class; GstBaseSrcClass *gstbasesrc_class; gobject_class = (GObjectClass *) klass; gstbasesrc_class = (GstBaseSrcClass *) klass; gobject_class->set_property = gst_sinesrc_set_property; gobject_class->get_property = gst_sinesrc_get_property; g_object_class_install_property (G_OBJECT_CLASS (klass), 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_FREQ, g_param_spec_double ("freq", "Frequency", "Frequency of sine source", 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", 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_sinesrc_setcaps); gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_sinesrc_start); gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_sinesrc_create); gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_sinesrc_unlock); } static void gst_sinesrc_init (GstSineSrc * src, GstSineSrcClass * g_class) { GstPad *pad = GST_BASE_SRC_PAD (src); gst_pad_set_fixatecaps_function (pad, gst_sinesrc_src_fixate); gst_pad_set_query_function (pad, gst_sinesrc_src_query); gst_pad_set_query_type_function (pad, gst_sinesrc_get_query_types); src->samplerate = 44100; src->volume = 1.0; src->freq = 440.0; gst_base_src_set_live (GST_BASE_SRC (src), FALSE); src->samples_per_buffer = 1024; src->timestamp = G_GINT64_CONSTANT (0); src->offset = G_GINT64_CONSTANT (0); src->timestamp_offset = G_GINT64_CONSTANT (0); } static void gst_sinesrc_src_fixate (GstPad * pad, GstCaps * caps) { GstStructure *structure; structure = gst_caps_get_structure (caps, 0); gst_caps_structure_fixate_field_nearest_int (structure, "rate", 44100); } static gboolean gst_sinesrc_setcaps (GstBaseSrc * basesrc, GstCaps * caps) { GstSineSrc *sinesrc; const GstStructure *structure; gboolean ret; sinesrc = GST_SINESRC (basesrc); structure = gst_caps_get_structure (caps, 0); ret = gst_structure_get_int (structure, "rate", &sinesrc->samplerate); return ret; } static const GstQueryType * gst_sinesrc_get_query_types (GstPad * pad) { static const GstQueryType query_types[] = { GST_QUERY_POSITION, 0, }; return query_types; } static gboolean gst_sinesrc_src_query (GstPad * pad, GstQuery * query) { gboolean res = FALSE; GstSineSrc *src; src = GST_SINESRC (GST_PAD_PARENT (pad)); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_POSITION: { GstFormat format; gint64 current; gst_query_parse_position (query, &format, NULL, NULL); switch (format) { case GST_FORMAT_TIME: current = src->timestamp; res = TRUE; break; case GST_FORMAT_DEFAULT: /* samples */ current = src->offset / 2; /* 16bpp audio */ res = TRUE; break; case GST_FORMAT_BYTES: current = src->offset; res = TRUE; break; default: break; } if (res) { gst_query_set_position (query, format, current, -1); } break; } default: break; } return res; } /* with STREAM_LOCK */ static GstClockReturn gst_sinesrc_wait (GstSineSrc * src, GstClockTime time) { GstClockReturn ret; GstClockTime base_time; GST_LOCK (src); /* clock_id should be NULL outside of this function */ g_assert (src->clock_id == NULL); g_assert (GST_CLOCK_TIME_IS_VALID (time)); base_time = GST_ELEMENT (src)->base_time; src->clock_id = gst_clock_new_single_shot_id (GST_ELEMENT_CLOCK (src), time + base_time); GST_UNLOCK (src); ret = gst_clock_id_wait (src->clock_id, NULL); GST_LOCK (src); gst_clock_id_unref (src->clock_id); src->clock_id = NULL; GST_UNLOCK (src); return ret; } static gboolean gst_sinesrc_unlock (GstBaseSrc * bsrc) { GstSineSrc *src = GST_SINESRC (bsrc); GST_LOCK (src); if (src->clock_id) gst_clock_id_unschedule (src->clock_id); GST_UNLOCK (src); return TRUE; } static GstFlowReturn gst_sinesrc_create (GstBaseSrc * basesrc, guint64 offset, guint length, GstBuffer ** buffer) { GstSineSrc *src; GstBuffer *buf; guint tdiff; gdouble step; gint16 *samples; gint i; src = GST_SINESRC (basesrc); 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, "sine wave", NULL); event = gst_event_new_tag (taglist); gst_pad_push_event (basesrc->srcpad, event); src->tags_pushed = TRUE; } tdiff = src->samples_per_buffer * GST_SECOND / src->samplerate; if (gst_base_src_is_live (basesrc)) { GstClockReturn ret; ret = gst_sinesrc_wait (src, src->timestamp + src->timestamp_offset); if (ret == GST_CLOCK_UNSCHEDULED) goto unscheduled; } buf = gst_buffer_new_and_alloc (src->samples_per_buffer * sizeof (gint16)); gst_buffer_set_caps (buf, GST_PAD_CAPS (basesrc->srcpad)); GST_BUFFER_TIMESTAMP (buf) = src->timestamp + src->timestamp_offset; /* offset is the number of samples */ GST_BUFFER_OFFSET (buf) = src->offset; GST_BUFFER_OFFSET_END (buf) = src->offset + src->samples_per_buffer; GST_BUFFER_DURATION (buf) = tdiff; gst_object_sync_values (G_OBJECT (src), src->timestamp); samples = (gint16 *) GST_BUFFER_DATA (buf); src->timestamp += tdiff; src->offset += src->samples_per_buffer; step = 2 * M_PI * src->freq / src->samplerate; for (i = 0; i < src->samples_per_buffer; i++) { src->accumulator += step; if (src->accumulator >= 2 * M_PI) src->accumulator -= 2 * M_PI; samples[i] = sin (src->accumulator) * src->volume * 32767.0; } *buffer = buf; return GST_FLOW_OK; unscheduled: { GST_DEBUG_OBJECT (src, "Unscheduled while waiting for clock"); return GST_FLOW_WRONG_STATE; /* is this the right return? */ } } static void gst_sinesrc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstSineSrc *src = GST_SINESRC (object); switch (prop_id) { case PROP_SAMPLES_PER_BUFFER: src->samples_per_buffer = g_value_get_int (value); break; case PROP_FREQ: src->freq = g_value_get_double (value); break; case PROP_VOLUME: src->volume = g_value_get_double (value); 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_sinesrc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstSineSrc *src = GST_SINESRC (object); switch (prop_id) { case PROP_SAMPLES_PER_BUFFER: g_value_set_int (value, src->samples_per_buffer); 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 gst_sinesrc_start (GstBaseSrc * basesrc) { GstSineSrc *src = GST_SINESRC (basesrc); src->timestamp = G_GINT64_CONSTANT (0); src->offset = G_GINT64_CONSTANT (0); return TRUE; } static gboolean plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "sinesrc", GST_RANK_NONE, GST_TYPE_SINESRC); } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "sine", "Sine audio wave generator", plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)