gstreamer/ext/snapshot/gstsnapshot.c

348 lines
9.5 KiB
C
Raw Normal View History

/* 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/Editor/Video",
"Dump a frame to a png file",
"Jeremy SIMON <jsimon13@yahoo.fr>",
};
static GstStaticPadTemplate snapshot_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
);
static GstStaticPadTemplate snapshot_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
);
/* 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_base_init (gpointer g_class);
static void gst_snapshot_class_init (GstSnapshotClass * klass);
static void gst_snapshot_init (GstSnapshot * snapshot);
static void gst_snapshot_chain (GstPad * pad, GstData * _data);
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),
gst_snapshot_base_init,
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_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 (&snapshot_sink_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&snapshot_src_factory));
gst_element_class_set_details (element_class, &snapshot_details);
}
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, const GstCaps * caps)
{
GstSnapshot *filter;
gdouble fps;
GstStructure *structure;
filter = GST_SNAPSHOT (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);
gst_structure_get_fourcc (structure, "format", &filter->format);
filter->to_bpp = 24;
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_static_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_static_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, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstSnapshot *snapshot;
guchar *data;
gulong size;
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));
snapshot->cur_frame++;
if (snapshot->cur_frame == snapshot->frame ||
snapshot->snapshot_asked == TRUE) {
snapshot->snapshot_asked = FALSE;
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 {
snapshot->png_struct_ptr =
png_create_write_struct (PNG_LIBPNG_VER_STRING, (png_voidp) NULL,
user_error_fn, user_warning_fn);
if (snapshot->png_struct_ptr == NULL)
g_warning ("Failed to initialize png structure");
snapshot->png_info_ptr =
png_create_info_struct (snapshot->png_struct_ptr);
if (setjmp (snapshot->png_struct_ptr->jmpbuf))
png_destroy_write_struct (&snapshot->png_struct_ptr,
&snapshot->png_info_ptr);
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 + (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);
}
}
gst_pad_push (snapshot->srcpad, GST_DATA (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 (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "snapshot", GST_RANK_NONE,
GST_TYPE_SNAPSHOT))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"snapshot",
"Dump a frame to a png file",
plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)