gstreamer/ext/snapshot/gstsnapshot.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 <inttypes.h>
#include "gstsnapshot.h"
#include <gst/video/video.h>
#define MAX_HEIGHT 2048
/* elementfactory information */
static GstElementDetails snapshot_details = {
"snapshot",
"Filter/Video",
"LGPL",
"Dump a frame to a png file",
VERSION,
"Jeremy SIMON <jsimon13@yahoo.fr>",
"(C) 2002",
};
GST_PAD_TEMPLATE_FACTORY (snapshot_src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
gst_caps_new (
"snapshot_src",
"video/x-raw-yuv",
GST_VIDEO_YUV_PAD_TEMPLATE_PROPS (
GST_PROPS_LIST (
GST_PROPS_FOURCC (GST_STR_FOURCC ("I420")),
GST_PROPS_FOURCC (GST_STR_FOURCC ("YUY2"))
))
)
)
GST_PAD_TEMPLATE_FACTORY (snapshot_sink_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
gst_caps_new (
"snapshot_src",
"video/x-raw-yuv",
GST_VIDEO_YUV_PAD_TEMPLATE_PROPS (
GST_PROPS_LIST (
GST_PROPS_FOURCC (GST_STR_FOURCC ("I420")),
GST_PROPS_FOURCC (GST_STR_FOURCC ("YUY2"))
))
)
)
/* Snapshot signals and args */
enum {
/* FILL ME */
SNAPSHOT_SIGNAL,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_FRAME,
ARG_LOCATION
};
static GType gst_snapshot_get_type (void);
static void gst_snapshot_class_init (GstSnapshotClass *klass);
static void gst_snapshot_init (GstSnapshot *snapshot);
static void gst_snapshot_chain (GstPad *pad, GstBuffer *buf);
static void gst_snapshot_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_snapshot_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void snapshot_handler(GstElement *element);
static GstElementClass *parent_class = NULL;
static guint gst_snapshot_signals[LAST_SIGNAL] = { 0 };
static void user_error_fn(png_structp png_ptr, png_const_charp error_msg)
{
g_warning("%s", error_msg);
}
static void user_warning_fn(png_structp png_ptr, png_const_charp warning_msg)
{
g_warning("%s", warning_msg);
}
GType
gst_snapshot_get_type (void)
{
static GType snapshot_type = 0;
if (!snapshot_type) {
static const GTypeInfo snapshot_info = {
sizeof(GstSnapshotClass), NULL, NULL, (GClassInitFunc)gst_snapshot_class_init,
NULL,
NULL,
sizeof(GstSnapshot),
0,
(GInstanceInitFunc)gst_snapshot_init,
};
snapshot_type = g_type_register_static(GST_TYPE_ELEMENT, "GstSnapshot", &snapshot_info, 0);
}
return snapshot_type;
}
static void
gst_snapshot_class_init (GstSnapshotClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FRAME,
g_param_spec_long("frame","frame","frame",
0, G_MAXLONG, 0, G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LOCATION,
g_param_spec_string("location","location","location",
0,G_PARAM_READWRITE));
gst_snapshot_signals[SNAPSHOT_SIGNAL] =
g_signal_new("snapshot", G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET(GstSnapshotClass, snapshot),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
klass->snapshot = snapshot_handler;
gobject_class->set_property = gst_snapshot_set_property;
gobject_class->get_property = gst_snapshot_get_property;
}
static void
snapshot_handler(GstElement *element)
{
GstSnapshot *snapshot;
snapshot = GST_SNAPSHOT( element );
snapshot->snapshot_asked=TRUE;
}
static gboolean
gst_snapshot_sinkconnect (GstPad *pad, GstCaps *caps)
{
GstSnapshot *filter;
GstCaps *from_caps, *to_caps;
gfloat fps;
filter = GST_SNAPSHOT (gst_pad_get_parent (pad));
if (!GST_CAPS_IS_FIXED (caps))
return GST_PAD_LINK_DELAYED;
gst_caps_get_int (caps, "width", &filter->width);
gst_caps_get_int (caps, "height", &filter->height);
gst_caps_get_float (caps, "framerate", &fps);
gst_caps_get_fourcc_int (caps, "format", &filter->format);
filter->to_bpp = 24;
to_caps = GST_CAPS_NEW (
"snapshot_conversion",
"video/x-raw-rgb",
"width", GST_PROPS_INT( filter->width ),
"height", GST_PROPS_INT( filter->height ),
"red_mask", GST_PROPS_INT (0x0000FF),
"green_mask", GST_PROPS_INT (0x00FF00),
"blue_mask", GST_PROPS_INT (0xFF0000),
"bpp", GST_PROPS_INT( 24 ),
"framerate", GST_PROPS_FLOAT (fps)
);
switch ( filter->format )
{
case GST_MAKE_FOURCC('Y','U','Y','2'):
case GST_MAKE_FOURCC('I','4','2','0'):
from_caps = GST_CAPS_NEW (
"snapshot_from",
"video/x-raw-yuv",
"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420")),
"width", GST_PROPS_INT( filter->width ),
"height", GST_PROPS_INT( filter->height ),
"framerate", GST_PROPS_FLOAT (fps)
);
filter->converter = gst_colorspace_yuv2rgb_get_converter ( from_caps, to_caps );
break;
default :
break;
}
filter->png_struct_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, user_error_fn, user_warning_fn);
if ( filter->png_struct_ptr == NULL )
g_warning( "Failed to initialize png structure");
filter->png_info_ptr = png_create_info_struct( filter->png_struct_ptr );
if (setjmp( filter->png_struct_ptr->jmpbuf))
png_destroy_write_struct(&filter->png_struct_ptr, &filter->png_info_ptr);
gst_pad_try_set_caps (filter->srcpad, caps);
return GST_PAD_LINK_OK;
}
static void
gst_snapshot_init (GstSnapshot *snapshot)
{
snapshot->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (snapshot_sink_factory), "sink");
gst_pad_set_link_function (snapshot->sinkpad, gst_snapshot_sinkconnect);
gst_pad_set_chain_function (snapshot->sinkpad, gst_snapshot_chain);
gst_element_add_pad (GST_ELEMENT (snapshot), snapshot->sinkpad);
snapshot->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (snapshot_src_factory), "src");
gst_element_add_pad (GST_ELEMENT (snapshot), snapshot->srcpad);
snapshot->cur_frame = 0;
snapshot->frame=-1;
snapshot->snapshot_asked=FALSE;
}
static void
gst_snapshot_chain (GstPad *pad, GstBuffer *buf)
{
GstSnapshot *snapshot;
guchar *data, *data_to_convert, *buffer_i420, *data_converted;
gulong size,image_size;
GstBuffer *outbuf;
gint i;
png_byte *row_pointers[ MAX_HEIGHT ];
FILE *fp;
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(buf != NULL);
snapshot = GST_SNAPSHOT (GST_OBJECT_PARENT (pad));
data = GST_BUFFER_DATA(buf);
size = GST_BUFFER_SIZE(buf);
GST_DEBUG ("snapshot: have buffer of %d\n", GST_BUFFER_SIZE(buf));
outbuf = gst_buffer_new();
GST_BUFFER_DATA(outbuf) = g_malloc(GST_BUFFER_SIZE(buf));
GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf);
snapshot->cur_frame++;
if ( snapshot->cur_frame == snapshot->frame || snapshot->snapshot_asked == TRUE )
{
snapshot->snapshot_asked = FALSE;
image_size = snapshot->width * snapshot->height;
data_converted = g_malloc ((image_size * (snapshot->to_bpp/8)) );
if ( snapshot->format == GST_MAKE_FOURCC('Y','U','Y','2') )
{
GST_DEBUG ("YUY2 => RGB\n");
buffer_i420 = g_malloc ((image_size * (snapshot->to_bpp/8)) );
gst_colorspace_yuy2_to_i420( data, buffer_i420, snapshot->width, snapshot->height);
data_to_convert = buffer_i420;
}
else
data_to_convert = data;
gst_colorspace_convert (snapshot->converter, data_to_convert, data_converted);
GST_INFO ("dumpfile : %s\n", snapshot->location );
fp = fopen( snapshot->location, "wb" );
if ( fp == NULL )
g_warning(" Can not open %s\n", snapshot->location );
else
{
png_set_filter( snapshot->png_struct_ptr, 0, PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE );
png_init_io(snapshot->png_struct_ptr, fp);
png_set_compression_level( snapshot->png_struct_ptr, 9);
png_set_IHDR(
snapshot->png_struct_ptr,
snapshot->png_info_ptr,
snapshot->width,
snapshot->height,
snapshot->to_bpp/3,
PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT
);
for ( i = 0; i < snapshot->height; i++ )
row_pointers[i] = data_converted + (snapshot->width * i * snapshot->to_bpp/8 );
png_write_info( snapshot->png_struct_ptr, snapshot->png_info_ptr );
png_write_image( snapshot->png_struct_ptr, row_pointers );
png_write_end( snapshot->png_struct_ptr, NULL );
png_destroy_info_struct ( snapshot->png_struct_ptr, &snapshot->png_info_ptr );
png_destroy_write_struct( &snapshot->png_struct_ptr, (png_infopp)NULL );
fclose( fp );
g_signal_emit (G_OBJECT (snapshot),
gst_snapshot_signals[SNAPSHOT_SIGNAL], 0);
}
}
gst_pad_push(snapshot->srcpad,buf );
}
static void
gst_snapshot_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstSnapshot *snapshot;
g_return_if_fail(GST_IS_SNAPSHOT(object));
snapshot = GST_SNAPSHOT(object);
switch (prop_id) {
case ARG_LOCATION:
snapshot->location = g_strdup(g_value_get_string (value));
break;
case ARG_FRAME:
snapshot->frame = g_value_get_long(value);
break;
default:
break;
}
}
static void
gst_snapshot_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstSnapshot *snapshot;
g_return_if_fail(GST_IS_SNAPSHOT(object));
snapshot = GST_SNAPSHOT(object);
switch (prop_id) {
case ARG_LOCATION:
g_value_set_string(value, snapshot->location);
break;
case ARG_FRAME:
g_value_set_long(value, snapshot->frame);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_element_factory_new("snapshot",GST_TYPE_SNAPSHOT,
&snapshot_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (snapshot_sink_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (snapshot_src_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"snapshot",
plugin_init
};