gstreamer/gst/goom/gstgoom.c

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/* gstgoom.c: implementation of goom 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/bytestream/adapter.h>
#include "goom_core.h"
GST_DEBUG_CATEGORY_STATIC (goom_debug);
#define GST_CAT_DEFAULT goom_debug
#define GOOM_SAMPLES 512
#define GST_TYPE_GOOM (gst_goom_get_type())
#define GST_GOOM(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GOOM,GstGOOM))
#define GST_GOOM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GOOM,GstGOOM))
#define GST_IS_GOOM(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GOOM))
#define GST_IS_GOOM_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GOOM))
typedef struct _GstGOOM GstGOOM;
typedef struct _GstGOOMClass GstGOOMClass;
struct _GstGOOM
{
GstElement element;
/* pads */
GstPad *sinkpad, *srcpad;
GstAdapter *adapter;
/* input tracking */
gint sample_rate;
gint16 datain[2][GOOM_SAMPLES];
/* the timestamp of the next frame */
GstClockTime audio_basetime;
guint64 samples_consumed;
/* video state */
gdouble fps;
gint width;
gint height;
gint channels;
gboolean srcnegotiated;
gboolean disposed;
};
struct _GstGOOMClass
{
GstElementClass parent_class;
};
GType gst_goom_get_type (void);
/* elementfactory information */
static GstElementDetails gst_goom_details = {
"GOOM: what a GOOM!",
"Visualization",
"Takes frames of data and outputs video frames using the GOOM filter",
"Wim Taymans <wim.taymans@chello.be>"
};
/* signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
/* FILL ME */
};
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB_HOST_ENDIAN)
);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", /* the name of the pads */
GST_PAD_SINK, /* type of the pad */
GST_PAD_ALWAYS, /* ALWAYS/SOMETIMES */
GST_STATIC_CAPS ("audio/x-raw-int, "
"endianness = (int) BYTE_ORDER, "
"signed = (boolean) TRUE, "
"width = (int) 16, "
"depth = (int) 16, "
"rate = (int) [ 8000, 96000 ], " "channels = (int) [ 1, 2 ]")
);
static void gst_goom_class_init (GstGOOMClass * klass);
static void gst_goom_base_init (GstGOOMClass * klass);
static void gst_goom_init (GstGOOM * goom);
static void gst_goom_dispose (GObject * object);
static GstElementStateReturn gst_goom_change_state (GstElement * element);
static void gst_goom_chain (GstPad * pad, GstData * _data);
static GstPadLinkReturn gst_goom_sinkconnect (GstPad * pad,
const GstCaps * caps);
static GstPadLinkReturn gst_goom_srcconnect (GstPad * pad,
const GstCaps * caps);
static GstCaps *gst_goom_src_fixate (GstPad * pad, const GstCaps * caps);
static GstElementClass *parent_class = NULL;
GType
gst_goom_get_type (void)
{
static GType type = 0;
if (!type) {
static const GTypeInfo info = {
sizeof (GstGOOMClass),
(GBaseInitFunc) gst_goom_base_init,
NULL,
(GClassInitFunc) gst_goom_class_init,
NULL,
NULL,
sizeof (GstGOOM),
0,
(GInstanceInitFunc) gst_goom_init,
};
type = g_type_register_static (GST_TYPE_ELEMENT, "GstGOOM", &info, 0);
}
return type;
}
static void
gst_goom_base_init (GstGOOMClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_details (element_class, &gst_goom_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
}
static void
gst_goom_class_init (GstGOOMClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->dispose = gst_goom_dispose;
gstelement_class->change_state = gst_goom_change_state;
GST_DEBUG_CATEGORY_INIT (goom_debug, "goom", 0, "goom visualisation element");
}
static void
gst_goom_init (GstGOOM * goom)
{
/* create the sink and src pads */
goom->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get (&sink_template),
"sink");
goom->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get (&src_template),
"src");
gst_element_add_pad (GST_ELEMENT (goom), goom->sinkpad);
gst_element_add_pad (GST_ELEMENT (goom), goom->srcpad);
GST_FLAG_SET (goom, GST_ELEMENT_EVENT_AWARE);
gst_pad_set_chain_function (goom->sinkpad, gst_goom_chain);
gst_pad_set_link_function (goom->sinkpad, gst_goom_sinkconnect);
gst_pad_set_link_function (goom->srcpad, gst_goom_srcconnect);
gst_pad_set_fixate_function (goom->srcpad, gst_goom_src_fixate);
goom->adapter = gst_adapter_new ();
goom->width = 320;
goom->height = 200;
goom->fps = 25.; /* desired frame rate */
goom->channels = 0;
goom->sample_rate = 0;
goom->audio_basetime = GST_CLOCK_TIME_NONE;
goom->samples_consumed = 0;
goom->disposed = FALSE;
/* set to something */
goom_init (50, 50);
}
static void
gst_goom_dispose (GObject * object)
{
GstGOOM *goom = GST_GOOM (object);
if (!goom->disposed) {
goom_close ();
goom->disposed = TRUE;
g_object_unref (goom->adapter);
goom->adapter = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static GstPadLinkReturn
gst_goom_sinkconnect (GstPad * pad, const GstCaps * caps)
{
GstGOOM *goom;
GstStructure *structure;
goom = GST_GOOM (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "channels", &goom->channels);
gst_structure_get_int (structure, "rate", &goom->sample_rate);
return GST_PAD_LINK_OK;
}
static GstPadLinkReturn
gst_goom_srcconnect (GstPad * pad, const GstCaps * caps)
{
GstGOOM *goom;
GstStructure *structure;
goom = GST_GOOM (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "width", &goom->width);
gst_structure_get_int (structure, "height", &goom->height);
gst_structure_get_double (structure, "framerate", &goom->fps);
goom_set_resolution (goom->width, goom->height);
goom->srcnegotiated = TRUE;
return GST_PAD_LINK_OK;
}
static GstCaps *
gst_goom_src_fixate (GstPad * pad, const GstCaps * caps)
{
GstCaps *newcaps;
GstStructure *structure;
if (!gst_caps_is_simple (caps))
return NULL;
newcaps = gst_caps_copy (caps);
structure = gst_caps_get_structure (newcaps, 0);
if (gst_caps_structure_fixate_field_nearest_int (structure, "width", 320)) {
return newcaps;
}
if (gst_caps_structure_fixate_field_nearest_int (structure, "height", 240)) {
return newcaps;
}
if (gst_caps_structure_fixate_field_nearest_double (structure, "framerate",
30.0)) {
return newcaps;
}
/* failed to fixate */
gst_caps_free (newcaps);
return NULL;
}
static void
gst_goom_chain (GstPad * pad, GstData * _data)
{
GstBuffer *bufin = GST_BUFFER (_data);
GstGOOM *goom;
guint32 bytesperread;
gint16 *data;
gint samples_per_frame;
goom = GST_GOOM (gst_pad_get_parent (pad));
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);
gst_adapter_clear (goom->adapter);
goom->audio_basetime = value;
goom->samples_consumed = 0;
GST_DEBUG ("Got discont. Adjusting time to=%" G_GUINT64_FORMAT, value);
}
default:
gst_pad_event_default (pad, event);
break;
}
return;
}
if (goom->channels == 0) {
GST_ELEMENT_ERROR (goom, CORE, NEGOTIATION, (NULL),
("Format wasn't negotiated before chain function"));
gst_buffer_unref (bufin);
return;
}
if (!GST_PAD_IS_USABLE (goom->srcpad)) {
gst_buffer_unref (bufin);
return;
}
if (goom->audio_basetime == GST_CLOCK_TIME_NONE)
goom->audio_basetime = GST_BUFFER_TIMESTAMP (bufin);
if (goom->audio_basetime == GST_CLOCK_TIME_NONE)
goom->audio_basetime = 0;
bytesperread = GOOM_SAMPLES * goom->channels * sizeof (gint16);
samples_per_frame = goom->sample_rate / goom->fps;
data = (gint16 *) GST_BUFFER_DATA (bufin);
gst_adapter_push (goom->adapter, bufin);
GST_DEBUG ("Input buffer has %d samples, time=%" G_GUINT64_FORMAT,
GST_BUFFER_SIZE (bufin) * sizeof (gint16) * goom->channels,
GST_BUFFER_TIMESTAMP (bufin));
/* Collect samples until we have enough for an output frame */
while (gst_adapter_available (goom->adapter) > MAX (bytesperread,
samples_per_frame * goom->channels * sizeof (gint16))) {
const guint16 *data =
(const guint16 *) gst_adapter_peek (goom->adapter, bytesperread);
GstBuffer *bufout;
guchar *out_frame;
GstClockTimeDiff frame_duration = GST_SECOND / goom->fps;
gint i;
if (goom->channels == 2) {
for (i = 0; i < GOOM_SAMPLES; i++) {
goom->datain[0][i] = *data++;
goom->datain[1][i] = *data++;
}
} else {
for (i = 0; i < GOOM_SAMPLES; i++) {
goom->datain[0][i] = *data;
goom->datain[1][i] = *data++;
}
}
bufout = gst_buffer_new_and_alloc (goom->width * goom->height * 4);
GST_BUFFER_TIMESTAMP (bufout) =
goom->audio_basetime +
(GST_SECOND * goom->samples_consumed / goom->sample_rate);
GST_BUFFER_DURATION (bufout) = frame_duration;
GST_BUFFER_SIZE (bufout) = goom->width * goom->height * 4;
out_frame = (guchar *) goom_update (goom->datain);
memcpy (GST_BUFFER_DATA (bufout), out_frame, GST_BUFFER_SIZE (bufout));
GST_DEBUG ("Pushing frame with time=%" G_GUINT64_FORMAT ", duration=%"
G_GUINT64_FORMAT, GST_BUFFER_TIMESTAMP (bufout),
GST_BUFFER_DURATION (bufout));
gst_pad_push (goom->srcpad, GST_DATA (bufout));
goom->samples_consumed += samples_per_frame;
gst_adapter_flush (goom->adapter,
samples_per_frame * goom->channels * sizeof (gint16));
}
}
static GstElementStateReturn
gst_goom_change_state (GstElement * element)
{
GstGOOM *goom = GST_GOOM (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
break;
case GST_STATE_READY_TO_PAUSED:
goom->audio_basetime = GST_CLOCK_TIME_NONE;
goom->srcnegotiated = FALSE;
gst_adapter_clear (goom->adapter);
break;
case GST_STATE_PAUSED_TO_READY:
goom->channels = 0;
break;
default:
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, "goom", GST_RANK_NONE, GST_TYPE_GOOM);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"goom",
"GOOM visualization filter",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)