add gstsnapshot : drop a frame to a png file when the plugin recieved a signal or at a given frame

Original commit message from CVS:
add gstsnapshot : drop a frame to a png file when the plugin recieved a signal or
at a given frame

configure.ac

@@ -572,6 +572,14 @@ GST_CHECK_FEATURE(SMOOTHWAVE, [smoothwave plugin], smoothwave, [
   if test $HAVE_GTK = "yes"; then HAVE_SMOOTHWAVE=yes; fi;
 ])
 
+
+dnl *** snapshot ***
+translit(dnm, m, l) AM_CONDITIONAL(USE_LIBPNG, true)
+GST_CHECK_FEATURE(LIBPNG, [snapshot plugin], snapshot, [
+  GST_CHECK_LIBHEADER(LIBPNG, png, png_read_info, -lz, png.h, LIBPNG_LIBS="-lpng -lz")
+  AC_SUBST(LIBPNG_LIBS)
+])
+
 dnl *** tarkin ***
 dnl for now the sources are included in the plugin
 dnl and should be moved to ext-libs/ perhaps
@@ -833,6 +841,7 @@ ext/sdl/Makefile
 ext/shout/Makefile
 ext/sidplay/Makefile
 ext/smoothwave/Makefile
+ext/snapshot/Makefile
 ext/vorbis/Makefile
 ext/tarkin/Makefile
 ext/xmms/Makefile

ext/snapshot/Makefile.am

@@ -0,0 +1,10 @@
+plugindir = $(libdir)/gst
+
+plugin_LTLIBRARIES = libgstsnapshot.la
+
+libgstsnapshot_la_SOURCES = gstsnapshot.c ../hermes/yuv2rgb.c  ../hermes/yuv2yuv.c
+libgstsnapshot_la_CFLAGS = $(GST_CFLAGS) 
+libgstsnapshot_la_LIBADD = $(GST_LIBS) $(LIBPNG_LIBS)
+libgstsnapshot_la_LDFLAGS = @GST_PLUGIN_LDFLAGS@
+
+noinst_HEADERS = gstsnapshot.h

ext/snapshot/gstsnapshot.c

@@ -0,0 +1,396 @@
+/* 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.
+ */
+
+#include <string.h>
+#include <inttypes.h>
+
+#include "gstsnapshot.h"
+
+#define MAX_HEIGHT	2048
+
+
+static GstElementDetails snapshot_details = {
+  "snapshot",
+  "Filter/Effect",
+  "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/raw",
+     "format",     GST_PROPS_LIST (
+                     GST_PROPS_FOURCC (GST_STR_FOURCC ("I420")),
+		     GST_PROPS_FOURCC (GST_STR_FOURCC ("YUY2"))
+                   ),	          
+     "width",      GST_PROPS_INT_RANGE(0, G_MAXINT),
+     "height",     GST_PROPS_INT_RANGE(0, G_MAXINT) 
+  )
+)
+
+GST_PAD_TEMPLATE_FACTORY (snapshot_sink_factory,
+  "sink",
+  GST_PAD_SINK,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW (
+   "snapshot_src",
+   "video/raw",
+       "format",     GST_PROPS_LIST (
+                       GST_PROPS_FOURCC (GST_STR_FOURCC ("I420")),
+                       GST_PROPS_FOURCC (GST_STR_FOURCC ("YUY2"))
+                     ),
+       "width",      GST_PROPS_INT_RANGE(0, G_MAXINT),
+       "height",     GST_PROPS_INT_RANGE(0, G_MAXINT)
+  )
+)
+
+
+/* Shot 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	(GstShotClass *klass);
+static void	gst_snapshot_init	(GstShot *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(GstShotClass),      NULL,      NULL,      (GClassInitFunc)gst_snapshot_class_init,
+      NULL,
+      NULL,
+      sizeof(GstShot),
+      0,
+      (GInstanceInitFunc)gst_snapshot_init,
+    };
+    snapshot_type = g_type_register_static(GST_TYPE_ELEMENT, "GstShot", &snapshot_info, 0);
+  }
+  return snapshot_type;
+}
+
+static void
+gst_snapshot_class_init (GstShotClass *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(GstShotClass, 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)
+{
+  GstShot *snapshot;
+
+  snapshot = GST_SNAPSHOT( element );
+  snapshot->snapshot_asked=TRUE;
+}
+
+
+static gboolean
+gst_snapshot_sinkconnect (GstPad *pad, GstCaps *caps)
+{
+  GstShot *filter;
+  GstCaps *from_caps, *to_caps;
+
+  filter = GST_SNAPSHOT (gst_pad_get_parent (pad));
+
+  if (!GST_CAPS_IS_FIXED (caps))
+    return GST_PAD_CONNECT_DELAYED;
+
+  gst_caps_get_int (caps, "width", &filter->width);
+  gst_caps_get_int (caps, "height", &filter->height);
+  gst_caps_get_fourcc_int (caps, "format", &filter->format);
+  filter->to_bpp = 24;
+
+
+  to_caps = GST_CAPS_NEW (
+    "snapshot_conversion",
+    "video/raw",
+      "format",   GST_PROPS_FOURCC (GST_STR_FOURCC ("RGB ")),
+      "width",    GST_PROPS_INT( filter->width ),
+      "height",   GST_PROPS_INT( filter->height ),
+      "red_mask",   GST_PROPS_INT (0xFF0000),
+      "green_mask", GST_PROPS_INT (0x00FF00),
+      "blue_mask",  GST_PROPS_INT (0x0000FF),
+      "bpp",        GST_PROPS_INT( 24 ) 
+  );
+
+  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/raw",
+         "format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420")),
+         "width",    GST_PROPS_INT( filter->width ),
+         "height",   GST_PROPS_INT( filter->height ),
+         "red_mask",   GST_PROPS_INT (0xFF0000),
+         "green_mask", GST_PROPS_INT (0x00FF00),
+         "blue_mask",  GST_PROPS_INT (0x0000FF),
+         "bpp",        GST_PROPS_INT( 24 ) 
+       );
+
+       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_CONNECT_OK;
+}
+
+static void
+gst_snapshot_init (GstShot *snapshot)
+{
+  snapshot->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (snapshot_sink_factory), "sink");
+  gst_pad_set_connect_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)
+{
+  GstShot *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 (0,"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(0, "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(0,"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 );
+    }
+  }
+
+  gst_pad_push(snapshot->srcpad,buf );
+}
+
+static void
+gst_snapshot_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  GstShot *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)
+{
+  GstShot *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
+};
+

ext/snapshot/gstsnapshot.h

@@ -0,0 +1,83 @@
+/* Gnome-Streamer
+ * 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.
+ */
+
+
+#ifndef __GST_SNAPSHOT_H__
+#define __GST_SNAPSHOT_H__
+
+
+#include <config.h>
+#include <gst/gst.h>
+#include <png.h>
+
+#include "../hermes/yuv2rgb.h"
+#include "../hermes/yuv2yuv.h"
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+#define GST_TYPE_SNAPSHOT \
+  (gst_snapshot_get_type())
+#define GST_SNAPSHOT(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SNAPSHOT,GstShot))
+#define GST_SNAPSHOT_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SNAPSHOT,GstShot))
+#define GST_IS_SNAPSHOT(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SNAPSHOT))
+#define GST_IS_SNAPSHOT_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SNAPSHOT))
+
+typedef struct _GstShot GstShot;
+typedef struct _GstShotClass GstShotClass;
+
+struct _GstShot {
+  GstElement element;
+
+  guint32 format;
+  gint width;
+  gint height;
+  gint to_bpp;
+  glong frame;
+  glong cur_frame;
+  const gchar *location;
+  gboolean snapshot_asked;
+
+  png_structp png_struct_ptr;
+  png_infop png_info_ptr;
+
+  GstColorSpaceConverter *converter;
+
+  GstPad *sinkpad,*srcpad;
+};
+
+struct _GstShotClass {
+  GstElementClass parent_class;
+
+  void (*snapshot)  (GstElement *elem);
+};
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#endif /* __GST_SNAPSHOT_H__ */