gstreamer/gst/synaesthesia/gstsynaesthesia.c

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/* gstsynaesthesia.c: implementation of synaesthesia drawing element
* Copyright (C) <2001> Richard Boulton <richard@tartarus.org>
*
* 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 <string.h>
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/audio/audio.h>
#include <gst/bytestream/adapter.h>
#include "synaescope.h"
#define SYNAES_SAMPLES 512
#define SYNAES_WIDTH 320
#define SYNAES_HEIGHT 200
#define GST_TYPE_SYNAESTHESIA (gst_synaesthesia_get_type())
#define GST_SYNAESTHESIA(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SYNAESTHESIA,GstSynaesthesia))
#define GST_SYNAESTHESIA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SYNAESTHESIA,GstSynaesthesia))
#define GST_IS_SYNAESTHESIA(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SYNAESTHESIA))
#define GST_IS_SYNAESTHESIA_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SYNAESTHESIA))
typedef struct _GstSynaesthesia GstSynaesthesia;
typedef struct _GstSynaesthesiaClass GstSynaesthesiaClass;
struct _GstSynaesthesia
{
GstElement element;
/* pads */
GstPad *sinkpad, *srcpad;
GstAdapter *adapter;
/* the timestamp of the next frame */
guint64 audio_basetime;
guint64 samples_consumed;
gint16 datain[2][SYNAES_SAMPLES];
/* video state */
gdouble fps;
gint width;
gint height;
gint channels;
/* Audio state */
gint sample_rate;
};
struct _GstSynaesthesiaClass
{
GstElementClass parent_class;
};
GType gst_synaesthesia_get_type (void);
/* elementfactory information */
static GstElementDetails gst_synaesthesia_details =
GST_ELEMENT_DETAILS ("Synaesthesia",
"Visualization",
"Creates video visualizations of audio input, using stereo and pitch information",
"Richard Boulton <richard@tartarus.org>");
/* signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
static GstStaticPadTemplate gst_synaesthesia_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB_HOST_ENDIAN)
);
static GstStaticPadTemplate gst_synaesthesia_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_AUDIO_INT_STANDARD_PAD_TEMPLATE_CAPS)
);
static void gst_synaesthesia_base_init (gpointer g_class);
static void gst_synaesthesia_class_init (GstSynaesthesiaClass * klass);
static void gst_synaesthesia_init (GstSynaesthesia * synaesthesia);
static void gst_synaesthesia_finalize (GObject * object);
static void gst_synaesthesia_dispose (GObject * object);
static void gst_synaesthesia_chain (GstPad * pad, GstData * _data);
static GstElementStateReturn
gst_synaesthesia_change_state (GstElement * element);
static GstCaps *gst_synaesthesia_src_getcaps (GstPad * pad);
static GstPadLinkReturn
gst_synaesthesia_src_link (GstPad * pad, const GstCaps * caps);
static GstPadLinkReturn
gst_synaesthesia_sink_link (GstPad * pad, const GstCaps * caps);
static GstElementClass *parent_class = NULL;
GType
gst_synaesthesia_get_type (void)
{
static GType type = 0;
if (!type) {
static const GTypeInfo info = {
sizeof (GstSynaesthesiaClass),
gst_synaesthesia_base_init,
NULL,
(GClassInitFunc) gst_synaesthesia_class_init,
NULL,
NULL,
sizeof (GstSynaesthesia),
0,
(GInstanceInitFunc) gst_synaesthesia_init,
};
type =
g_type_register_static (GST_TYPE_ELEMENT, "GstSynaesthesia", &info, 0);
}
return type;
}
static void
gst_synaesthesia_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_synaesthesia_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_synaesthesia_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_synaesthesia_sink_template));
}
static void
gst_synaesthesia_class_init (GstSynaesthesiaClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gstelement_class->change_state = gst_synaesthesia_change_state;
gobject_class->dispose = gst_synaesthesia_dispose;
gobject_class->finalize = gst_synaesthesia_finalize;
}
static void
gst_synaesthesia_init (GstSynaesthesia * synaesthesia)
{
/* create the sink and src pads */
synaesthesia->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_synaesthesia_sink_template), "sink");
synaesthesia->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_synaesthesia_src_template), "src");
gst_element_add_pad (GST_ELEMENT (synaesthesia), synaesthesia->sinkpad);
gst_element_add_pad (GST_ELEMENT (synaesthesia), synaesthesia->srcpad);
gst_pad_set_chain_function (synaesthesia->sinkpad, gst_synaesthesia_chain);
gst_pad_set_link_function (synaesthesia->sinkpad, gst_synaesthesia_sink_link);
gst_pad_set_getcaps_function (synaesthesia->srcpad,
gst_synaesthesia_src_getcaps);
gst_pad_set_link_function (synaesthesia->srcpad, gst_synaesthesia_src_link);
GST_FLAG_SET (synaesthesia, GST_ELEMENT_EVENT_AWARE);
synaesthesia->adapter = gst_adapter_new ();
/* reset the initial video state */
synaesthesia->width = SYNAES_WIDTH;
synaesthesia->height = SYNAES_HEIGHT;
synaesthesia->fps = 25.0; /* desired frame rate */
synaesthesia->sample_rate = 0;
synaesthesia->channels = 2;
synaesthesia->audio_basetime = GST_CLOCK_TIME_NONE;
synaesthesia->samples_consumed = 0;
synaesthesia_init (synaesthesia->width, synaesthesia->height);
}
static void
gst_synaesthesia_dispose (GObject * object)
{
GstSynaesthesia *synaesthesia;
synaesthesia = GST_SYNAESTHESIA (object);
if (synaesthesia->adapter) {
g_object_unref (synaesthesia->adapter);
synaesthesia->adapter = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_synaesthesia_finalize (GObject * object)
{
GstSynaesthesia *synaesthesia;
synaesthesia = GST_SYNAESTHESIA (object);
synaesthesia_close ();
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstPadLinkReturn
gst_synaesthesia_sink_link (GstPad * pad, const GstCaps * caps)
{
GstSynaesthesia *synaesthesia;
GstStructure *structure;
gint channels;
gint rate;
synaesthesia = GST_SYNAESTHESIA (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "channels", &channels) ||
!gst_structure_get_int (structure, "rate", &rate)) {
return GST_PAD_LINK_REFUSED;
}
if (synaesthesia->channels != 2)
return GST_PAD_LINK_REFUSED;
synaesthesia->sample_rate = rate;
return GST_PAD_LINK_OK;
}
static GstCaps *
gst_synaesthesia_src_getcaps (GstPad * pad)
{
GstCaps *caps;
const GstCaps *templcaps;
gint i;
templcaps = gst_pad_get_pad_template_caps (pad);
caps = gst_caps_copy (templcaps);
for (i = 0; i < gst_caps_get_size (caps); i++) {
GstStructure *structure = gst_caps_get_structure (caps, i);
gst_structure_set (structure, "width", G_TYPE_INT, SYNAES_WIDTH, "height",
G_TYPE_INT, SYNAES_HEIGHT, NULL);
}
return caps;
}
static GstPadLinkReturn
gst_synaesthesia_src_link (GstPad * pad, const GstCaps * caps)
{
GstSynaesthesia *synaesthesia;
GstStructure *structure;
gint w, h;
gdouble fps;
synaesthesia = GST_SYNAESTHESIA (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "width", &w) ||
!gst_structure_get_int (structure, "height", &h) ||
!gst_structure_get_double (structure, "framerate", &fps)) {
return GST_PAD_LINK_REFUSED;
}
if ((w != SYNAES_WIDTH) || (h != SYNAES_HEIGHT))
return GST_PAD_LINK_REFUSED;
synaesthesia->width = w;
synaesthesia->height = h;
synaesthesia->fps = fps;
synaesthesia_init (synaesthesia->width, synaesthesia->height);
return GST_PAD_LINK_OK;
}
static void
gst_synaesthesia_chain (GstPad * pad, GstData * _data)
{
GstBuffer *bufin = GST_BUFFER (_data);
GstSynaesthesia *synaesthesia;
guint32 bytesperread;
gint samples_per_frame;
synaesthesia = GST_SYNAESTHESIA (gst_pad_get_parent (pad));
GST_DEBUG ("Synaesthesia: chainfunc called");
if (GST_IS_EVENT (bufin)) {
GstEvent *event = GST_EVENT (bufin);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
{
gint64 value = 0;
gst_event_discont_get_value (event, GST_FORMAT_TIME, &value);
synaesthesia->audio_basetime = value;
synaesthesia->samples_consumed = 0;
gst_adapter_clear (synaesthesia->adapter);
}
default:
gst_pad_event_default (pad, event);
break;
}
return;
}
if (!GST_PAD_IS_USABLE (synaesthesia->srcpad)) {
gst_buffer_unref (bufin);
return;
}
if (synaesthesia->audio_basetime == GST_CLOCK_TIME_NONE)
synaesthesia->audio_basetime = GST_BUFFER_TIMESTAMP (bufin);
if (synaesthesia->audio_basetime == GST_CLOCK_TIME_NONE)
synaesthesia->audio_basetime = 0;
bytesperread = SYNAES_SAMPLES * synaesthesia->channels * sizeof (gint16);
samples_per_frame = synaesthesia->sample_rate / synaesthesia->fps;
gst_adapter_push (synaesthesia->adapter, bufin);
while (gst_adapter_available (synaesthesia->adapter) >
MAX (bytesperread,
samples_per_frame * synaesthesia->channels * sizeof (gint16))) {
const guint16 *data =
(const guint16 *) gst_adapter_peek (synaesthesia->adapter,
bytesperread);
GstBuffer *bufout;
guchar *out_frame;
GstClockTimeDiff frame_duration = GST_SECOND / synaesthesia->fps;
gint i;
for (i = 0; i < SYNAES_SAMPLES; i++) {
synaesthesia->datain[0][i] = *data++;
synaesthesia->datain[1][i] = *data++;
}
bufout =
gst_buffer_new_and_alloc (synaesthesia->width * synaesthesia->height *
4);
GST_BUFFER_TIMESTAMP (bufout) =
synaesthesia->audio_basetime +
(GST_SECOND * synaesthesia->samples_consumed /
synaesthesia->sample_rate);
GST_BUFFER_DURATION (bufout) = frame_duration;
GST_BUFFER_SIZE (bufout) = synaesthesia->width * synaesthesia->height * 4;
out_frame = (guchar *) synaesthesia_update (synaesthesia->datain);
memcpy (GST_BUFFER_DATA (bufout), out_frame, GST_BUFFER_SIZE (bufout));
gst_pad_push (synaesthesia->srcpad, GST_DATA (bufout));
synaesthesia->samples_consumed += samples_per_frame;
gst_adapter_flush (synaesthesia->adapter, samples_per_frame *
synaesthesia->channels * sizeof (gint16));
}
}
static GstElementStateReturn
gst_synaesthesia_change_state (GstElement * element)
{
GstSynaesthesia *synaesthesia;
synaesthesia = GST_SYNAESTHESIA (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_READY_TO_PAUSED:
synaesthesia->audio_basetime = GST_CLOCK_TIME_NONE;
gst_adapter_clear (synaesthesia->adapter);
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_library_load ("gstbytestream"))
return FALSE;
return gst_element_register (plugin, "synaesthesia", GST_RANK_NONE,
GST_TYPE_SYNAESTHESIA);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"synaesthesia",
"Creates video visualizations of audio input, using stereo and pitch information",
plugin_init, VERSION, "GPL", GST_PACKAGE, GST_ORIGIN)