gstreamer/gst/y4m/gsty4mencode.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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 <math.h>
#include <gst/gst.h>
#include <gst/video/video.h>
#include "gsty4mencode.h"
static GstElementDetails y4mencode_details = GST_ELEMENT_DETAILS ("Y4mEncode",
"Codec/Encoder/Video",
"Encodes a YUV frame into the yuv4mpeg format (mjpegtools)",
"Wim Taymans <wim.taymans@chello.be>");
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
static GstStaticPadTemplate y4mencode_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-yuv4mpeg, " "y4mversion = (int) 1")
);
static GstStaticPadTemplate y4mencode_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static void gst_y4mencode_base_init (gpointer g_class);
static void gst_y4mencode_class_init (GstY4mEncodeClass * klass);
static void gst_y4mencode_init (GstY4mEncode * filter);
static void gst_y4mencode_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_y4mencode_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_y4mencode_chain (GstPad * pad, GstData * _data);
static GstElementStateReturn gst_y4mencode_change_state (GstElement * element);
static GstElementClass *parent_class = NULL;
/*static guint gst_filter_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_y4mencode_get_type (void)
{
static GType y4mencode_type = 0;
if (!y4mencode_type) {
static const GTypeInfo y4mencode_info = {
sizeof (GstY4mEncodeClass),
gst_y4mencode_base_init,
NULL,
(GClassInitFunc) gst_y4mencode_class_init,
NULL,
NULL,
sizeof (GstY4mEncode),
0,
(GInstanceInitFunc) gst_y4mencode_init,
};
y4mencode_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstY4mEncode", &y4mencode_info, 0);
}
return y4mencode_type;
}
static void
gst_y4mencode_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 (&y4mencode_src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&y4mencode_sink_factory));
gst_element_class_set_details (element_class, &y4mencode_details);
}
static void
gst_y4mencode_class_init (GstY4mEncodeClass * 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_y4mencode_change_state;
gobject_class->set_property = gst_y4mencode_set_property;
gobject_class->get_property = gst_y4mencode_get_property;
}
static GstPadLinkReturn
gst_y4mencode_sinkconnect (GstPad * pad, const GstCaps * caps)
{
GstY4mEncode *filter;
gint idx = -1, i;
gdouble fps;
gdouble framerates[] = {
00.000,
23.976, 24.000, /* 24fps movie */
25.000, /* PAL */
29.970, 30.000, /* NTSC */
50.000,
59.940, 60.000
};
GstStructure *structure;
filter = GST_Y4MENCODE (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "width", &filter->width);
gst_structure_get_int (structure, "height", &filter->height);
gst_structure_get_double (structure, "framerate", &fps);
/* find fps idx */
for (i = 1; i < 9; i++) {
if (idx == -1) {
idx = i;
} else {
gdouble old_diff = fabs (framerates[idx] - fps),
new_diff = fabs (framerates[i] - fps);
if (new_diff < old_diff) {
idx = i;
}
}
}
filter->fps_idx = idx;
return GST_PAD_LINK_OK;
}
static void
gst_y4mencode_init (GstY4mEncode * filter)
{
filter->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&y4mencode_sink_factory), "sink");
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_pad_set_chain_function (filter->sinkpad, gst_y4mencode_chain);
gst_pad_set_link_function (filter->sinkpad, gst_y4mencode_sinkconnect);
filter->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&y4mencode_src_factory), "src");
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
filter->init = TRUE;
}
static void
gst_y4mencode_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstY4mEncode *filter;
GstBuffer *outbuf;
gchar *header;
gint len;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
filter = GST_Y4MENCODE (gst_pad_get_parent (pad));
g_return_if_fail (filter != NULL);
g_return_if_fail (GST_IS_Y4MENCODE (filter));
outbuf = gst_buffer_new ();
GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (buf) + 256);
if (filter->init) {
header = "YUV4MPEG %d %d %d\nFRAME\n";
filter->init = FALSE;
} else {
header = "FRAME\n";
}
snprintf (GST_BUFFER_DATA (outbuf), 255, header,
filter->width, filter->height, filter->fps_idx);
len = strlen (GST_BUFFER_DATA (outbuf));
memcpy (GST_BUFFER_DATA (outbuf) + len, GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf));
GST_BUFFER_SIZE (outbuf) = GST_BUFFER_SIZE (buf) + len;
gst_buffer_unref (buf);
gst_pad_push (filter->srcpad, GST_DATA (outbuf));
}
static void
gst_y4mencode_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstY4mEncode *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_Y4MENCODE (object));
filter = GST_Y4MENCODE (object);
switch (prop_id) {
default:
break;
}
}
static void
gst_y4mencode_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstY4mEncode *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_Y4MENCODE (object));
filter = GST_Y4MENCODE (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_y4mencode_change_state (GstElement * element)
{
GstY4mEncode *filter;
g_return_val_if_fail (GST_IS_Y4MENCODE (element), GST_STATE_FAILURE);
filter = GST_Y4MENCODE (element);
if (GST_STATE_TRANSITION (element) == GST_STATE_NULL_TO_READY) {
filter->init = TRUE;
}
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)
{
return gst_element_register (plugin, "y4menc", GST_RANK_NONE,
GST_TYPE_Y4MENCODE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"y4menc",
"Encodes a YUV frame into the yuv4mpeg format (mjpegtools)",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)