From c270b7e1238d272d10d0483f9e750c39654b6576 Mon Sep 17 00:00:00 2001 From: Stefan Kost Date: Sun, 21 May 2006 16:23:23 +0000 Subject: gst/spectrum/Makefile.am: Link to base libraries Original commit message from CVS: * gst/spectrum/Makefile.am: Link to base libraries * gst/spectrum/demo-osssrc.c: (main): use new threshhold property * gst/spectrum/gstspectrum.c: (gst_spectrum_class_init), (gst_spectrum_init), (gst_spectrum_dispose), (gst_spectrum_set_property), (gst_spectrum_set_sink_caps), (gst_spectrum_get_sink_caps), (gst_spectrum_chain), (gst_spectrum_change_state): * gst/spectrum/gstspectrum.h: Use gst_adapter, support multiple-channels, add threshold property for result, add docs, fix resulting spectrum range (was including mirrored results) --- gst/spectrum/gstspectrum.c | 218 ++++++++++++++++++++++++++++++++++----------- 1 file changed, 168 insertions(+), 50 deletions(-) (limited to 'gst/spectrum/gstspectrum.c') diff --git a/gst/spectrum/gstspectrum.c b/gst/spectrum/gstspectrum.c index 12762c58..37861f6b 100644 --- a/gst/spectrum/gstspectrum.c +++ b/gst/spectrum/gstspectrum.c @@ -17,6 +17,20 @@ * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ +/** + * SECTION:element-spectrum + * + * + * The Spectrum element analyzes the frequency spectrum of an audio signal. + * Analysis results are send as outgoing buffers. + * The buffer contains a guint8 value per frequency band. + * A value of 0 maps to the threshold property. + * + * It cannot be used with the gst-launch command in a sensible way. Instead the + * included demo shows how to use it. + * + * Last reviewed on 2006-05-21 (0.10.3) + */ #ifdef HAVE_CONFIG_H #include "config.h" @@ -42,7 +56,7 @@ GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-int, " "rate = (int) [ 1, MAX ], " - "channels = (int) 1, " + "channels = (int) [1, MAX], " "endianness = (int) BYTE_ORDER, " "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true") ); @@ -63,7 +77,8 @@ enum enum { ARG_0, - ARG_WIDTH + ARG_WIDTH, + ARG_THRESHOLD }; @@ -74,7 +89,11 @@ static void gst_spectrum_dispose (GObject * object); static void gst_spectrum_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); +static gboolean gst_spectrum_set_sink_caps (GstPad * pad, GstCaps * caps); +static GstCaps *gst_spectrum_get_sink_caps (GstPad * pad); static GstFlowReturn gst_spectrum_chain (GstPad * pad, GstBuffer * buffer); +static GstStateChangeReturn gst_spectrum_change_state (GstElement * element, + GstStateChange transition); #define fixed short extern int gst_spectrum_fix_fft (fixed fr[], fixed fi[], int m, int inverse); @@ -127,16 +146,24 @@ gst_spectrum_base_init (gpointer g_class) static void gst_spectrum_class_init (GstSpectrumClass * klass) { - GObjectClass *gobject_class = (GObjectClass *) klass; + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + GstElementClass *element = GST_ELEMENT_CLASS (klass); parent_class = g_type_class_peek_parent (klass); gobject_class->set_property = gst_spectrum_set_property; gobject_class->dispose = gst_spectrum_dispose; + element->change_state = gst_spectrum_change_state; + g_object_class_install_property (gobject_class, ARG_WIDTH, - g_param_spec_int ("width", "width", "width", - G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE)); + g_param_spec_uint ("width", "width", "number of frequency bands", + 0, G_MAXUINT, 0, G_PARAM_WRITABLE)); + + g_object_class_install_property (gobject_class, ARG_THRESHOLD, + g_param_spec_int ("threshold", "threshold", + "db threshold for result, maps to 0", G_MININT, 0, -60, + G_PARAM_WRITABLE)); } @@ -145,16 +172,20 @@ gst_spectrum_init (GstSpectrum * spectrum) { spectrum->sinkpad = gst_pad_new_from_static_template (&sink_template_factory, "sink"); - gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->sinkpad); gst_pad_set_chain_function (spectrum->sinkpad, gst_spectrum_chain); + gst_pad_set_setcaps_function (spectrum->sinkpad, gst_spectrum_set_sink_caps); + gst_pad_set_getcaps_function (spectrum->sinkpad, gst_spectrum_get_sink_caps); + gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->sinkpad); spectrum->srcpad = gst_pad_new_from_static_template (&src_template_factory, "src"); gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->srcpad); - spectrum->width = 75; - spectrum->base = 8; - spectrum->len = 1024; + spectrum->adapter = gst_adapter_new (); + + spectrum->width = 128; + spectrum->base = 9; + spectrum->len = 1024; /* 2 ^ (base+1) */ spectrum->loud = g_malloc (spectrum->len * sizeof (gint16)); spectrum->im = g_malloc (spectrum->len * sizeof (gint16)); @@ -168,6 +199,11 @@ gst_spectrum_dispose (GObject * object) { GstSpectrum *spectrum = GST_SPECTRUM (object); + if (spectrum->adapter) { + g_object_unref (spectrum->adapter); + spectrum->adapter = NULL; + } + g_free (spectrum->re); g_free (spectrum->im); g_free (spectrum->loud); @@ -183,7 +219,10 @@ gst_spectrum_set_property (GObject * object, guint prop_id, switch (prop_id) { case ARG_WIDTH: - spectrum->width = g_value_get_int (value); + spectrum->width = g_value_get_uint (value); + break; + case ARG_THRESHOLD: + spectrum->threshold = g_value_get_int (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); @@ -191,56 +230,135 @@ gst_spectrum_set_property (GObject * object, guint prop_id, } } +static gboolean +gst_spectrum_set_sink_caps (GstPad * pad, GstCaps * caps) +{ + GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad)); + GstStructure *structure = gst_caps_get_structure (caps, 0); + gboolean ret; + + ret = gst_structure_get_int (structure, "channels", &spectrum->channels); + GST_INFO ("Got channels = %d", spectrum->channels); + + gst_object_unref (spectrum); + + return ret; +} + +static GstCaps * +gst_spectrum_get_sink_caps (GstPad * pad) +{ + GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad)); + GstCaps *res; + GstStructure *structure; + + res = gst_caps_copy (gst_pad_get_pad_template_caps (spectrum->sinkpad)); + if (spectrum->channels) { + structure = gst_caps_get_structure (res, 0); + gst_structure_set (structure, "channels", G_TYPE_INT, spectrum->channels, + NULL); + GST_INFO ("Fixate channels = %d", spectrum->channels); + } + gst_object_unref (spectrum); + return res; +} + static GstFlowReturn gst_spectrum_chain (GstPad * pad, GstBuffer * buffer) { - GstSpectrum *spectrum; + GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad)); gint16 *samples; - gint step, pos, num, i; + gint wanted; + gint i, j, k; + gint32 acc; + gfloat pos, step; guchar *spect; - GstBuffer *newbuf; - - spectrum = GST_SPECTRUM (GST_OBJECT_PARENT (pad)); - samples = (gint16 *) GST_BUFFER_DATA (buffer); - - GST_LOG ("buffer-size = %ld", GST_BUFFER_SIZE (buffer)); - - /* FIXME:need a gst_adapter */ - num = GST_BUFFER_SIZE (buffer) / 2; - num = MIN (num, spectrum->len); - - for (i = 0; i < num; i++) - spectrum->re[i] = (samples[(i * 2)] + samples[(i * 2) + 1]) >> 1; - - gst_spectrum_window (spectrum->re, spectrum->len); - gst_spectrum_fix_fft (spectrum->re, spectrum->im, spectrum->base, FALSE); - gst_spectrum_fix_loud (spectrum->loud, spectrum->re, spectrum->im, - spectrum->len, 0); - - /* resample to requested width */ - step = spectrum->len / (spectrum->width * 4); /* <-- shouldn't this be 2 instead of 4? */ - spect = (guchar *) g_malloc (spectrum->width); - for (i = 0, pos = 0; i < spectrum->width; i++, pos += step) { - /* > -60 db? */ - if (spectrum->loud[pos] > -60) { - spect[i] = spectrum->loud[pos] + 60; - /* - if (spect[i] > 15); - spect[i] = 15; - */ - } else - /* treat as silence */ - spect[i] = 0; + GstBuffer *outbuf; + GstFlowReturn ret = GST_FLOW_OK; + + gst_adapter_push (spectrum->adapter, buffer); + /* required number of bytes */ + wanted = spectrum->channels * spectrum->len * 2; + /* FIXME: 4.0 was 2.0 before, but that include the mirrored spectrum */ + step = (gfloat) spectrum->len / (spectrum->width * 4.0); + + while (gst_adapter_available (spectrum->adapter) > wanted && + (ret == GST_FLOW_OK)) { + + samples = (gint16 *) gst_adapter_take (spectrum->adapter, wanted); + + for (i = 0, j = 0; i < spectrum->len; i++) { + for (k = 0, acc = 0; k < spectrum->channels; k++) + acc += samples[j++]; + spectrum->re[i] = (gint16) (acc / spectrum->channels); + } + + gst_spectrum_window (spectrum->re, spectrum->len); + gst_spectrum_fix_fft (spectrum->re, spectrum->im, spectrum->base, FALSE); + gst_spectrum_fix_loud (spectrum->loud, spectrum->re, spectrum->im, + spectrum->len, 0); + + ret = gst_pad_alloc_buffer_and_set_caps (spectrum->srcpad, + GST_BUFFER_OFFSET_NONE, spectrum->width, + GST_PAD_CAPS (spectrum->srcpad), &outbuf); + + /* resample to requested width */ + spect = GST_BUFFER_DATA (outbuf); + for (i = 0, pos = 0.0; i < spectrum->width; i++, pos += step) { + /* > -60 db? FIXME: make this a gobject property */ + if (spectrum->loud[(gint) pos] > spectrum->threshold) { + spect[i] = spectrum->loud[(gint) pos] - spectrum->threshold; + /* + if (spect[i] > 15); + spect[i] = 15; + */ + } else + /* treat as silence */ + spect[i] = 0; + } + + ret = gst_pad_push (spectrum->srcpad, outbuf); } - gst_buffer_unref (buffer); - newbuf = gst_buffer_new (); - GST_BUFFER_DATA (newbuf) = spect; - GST_BUFFER_SIZE (newbuf) = spectrum->width; + gst_object_unref (spectrum); + return ret; +} + +static GstStateChangeReturn +gst_spectrum_change_state (GstElement * element, GstStateChange transition) +{ + GstSpectrum *spectrum = GST_SPECTRUM (element); + GstStateChangeReturn ret; - return gst_pad_push (spectrum->srcpad, newbuf); + switch (transition) { + case GST_STATE_CHANGE_NULL_TO_READY: + break; + case GST_STATE_CHANGE_READY_TO_PAUSED: + gst_adapter_clear (spectrum->adapter); + break; + case GST_STATE_CHANGE_PAUSED_TO_PLAYING: + break; + default: + break; + } + + ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); + + switch (transition) { + case GST_STATE_CHANGE_PLAYING_TO_PAUSED: + break; + case GST_STATE_CHANGE_PAUSED_TO_READY: + break; + case GST_STATE_CHANGE_READY_TO_NULL: + break; + default: + break; + } + + return ret; } + static gboolean plugin_init (GstPlugin * plugin) { -- cgit v1.2.1