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Original commit message from CVS: Reviewed by: Ronald S. Bultje <rbultje@ronald.bitfreak.net> * ext/snapshot/gstsnapshot.c: (gst_snapshot_class_init): Fix segfault (#161667).
342 lines
9.3 KiB
C
342 lines
9.3 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <inttypes.h>
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#include "gstsnapshot.h"
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#include <gst/video/video.h>
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#define MAX_HEIGHT 2048
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/* elementfactory information */
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static GstElementDetails snapshot_details = {
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"snapshot",
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"Filter/Editor/Video",
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"Dump a frame to a png file",
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"Jeremy SIMON <jsimon13@yahoo.fr>",
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};
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static GstStaticPadTemplate snapshot_src_factory =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_BGR)
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);
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static GstStaticPadTemplate snapshot_sink_factory =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_BGR)
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);
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/* Snapshot signals and args */
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enum
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{
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/* FILL ME */
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SNAPSHOT_SIGNAL,
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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ARG_FRAME,
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ARG_LOCATION
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};
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static GType gst_snapshot_get_type (void);
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static void gst_snapshot_base_init (gpointer g_class);
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static void gst_snapshot_class_init (GstSnapshotClass * klass);
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static void gst_snapshot_init (GstSnapshot * snapshot);
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static void gst_snapshot_chain (GstPad * pad, GstData * _data);
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static void gst_snapshot_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_snapshot_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstElementClass *parent_class = NULL;
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static guint gst_snapshot_signals[LAST_SIGNAL] = { 0 };
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static void
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user_error_fn (png_structp png_ptr, png_const_charp error_msg)
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{
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g_warning ("%s", error_msg);
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}
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static void
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user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
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{
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g_warning ("%s", warning_msg);
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}
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GType
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gst_snapshot_get_type (void)
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{
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static GType snapshot_type = 0;
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if (!snapshot_type) {
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static const GTypeInfo snapshot_info = {
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sizeof (GstSnapshotClass),
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gst_snapshot_base_init,
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NULL,
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(GClassInitFunc) gst_snapshot_class_init,
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NULL,
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NULL,
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sizeof (GstSnapshot),
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0,
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(GInstanceInitFunc) gst_snapshot_init,
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};
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snapshot_type =
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g_type_register_static (GST_TYPE_ELEMENT, "GstSnapshot", &snapshot_info,
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0);
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}
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return snapshot_type;
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}
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static void
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gst_snapshot_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&snapshot_sink_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&snapshot_src_factory));
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gst_element_class_set_details (element_class, &snapshot_details);
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}
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static void
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gst_snapshot_class_init (GstSnapshotClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FRAME,
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g_param_spec_long ("frame", "frame", "frame",
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0, G_MAXLONG, 0, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LOCATION,
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g_param_spec_string ("location", "location", "location",
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0, G_PARAM_READWRITE));
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gst_snapshot_signals[SNAPSHOT_SIGNAL] =
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g_signal_new ("snapshot", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstSnapshotClass, snapshot),
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NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
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klass->snapshot = NULL;
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gobject_class->set_property = gst_snapshot_set_property;
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gobject_class->get_property = gst_snapshot_get_property;
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}
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static gboolean
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gst_snapshot_sinkconnect (GstPad * pad, const GstCaps * caps)
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{
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GstSnapshot *filter;
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gdouble fps;
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GstStructure *structure;
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filter = GST_SNAPSHOT (gst_pad_get_parent (pad));
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structure = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (structure, "width", &filter->width);
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gst_structure_get_int (structure, "height", &filter->height);
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gst_structure_get_double (structure, "framerate", &fps);
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gst_structure_get_fourcc (structure, "format", &filter->format);
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filter->to_bpp = 24;
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filter->png_struct_ptr =
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png_create_write_struct (PNG_LIBPNG_VER_STRING, (png_voidp) NULL,
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user_error_fn, user_warning_fn);
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if (filter->png_struct_ptr == NULL)
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g_warning ("Failed to initialize png structure");
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filter->png_info_ptr = png_create_info_struct (filter->png_struct_ptr);
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if (setjmp (filter->png_struct_ptr->jmpbuf))
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png_destroy_write_struct (&filter->png_struct_ptr, &filter->png_info_ptr);
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gst_pad_try_set_caps (filter->srcpad, caps);
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return GST_PAD_LINK_OK;
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}
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static void
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gst_snapshot_init (GstSnapshot * snapshot)
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{
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snapshot->sinkpad =
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gst_pad_new_from_template (gst_static_pad_template_get
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(&snapshot_sink_factory), "sink");
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gst_pad_set_link_function (snapshot->sinkpad, gst_snapshot_sinkconnect);
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gst_pad_set_chain_function (snapshot->sinkpad, gst_snapshot_chain);
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gst_element_add_pad (GST_ELEMENT (snapshot), snapshot->sinkpad);
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snapshot->srcpad =
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gst_pad_new_from_template (gst_static_pad_template_get
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(&snapshot_src_factory), "src");
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gst_element_add_pad (GST_ELEMENT (snapshot), snapshot->srcpad);
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snapshot->cur_frame = 0;
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snapshot->frame = -1;
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snapshot->snapshot_asked = FALSE;
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}
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static void
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gst_snapshot_chain (GstPad * pad, GstData * _data)
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{
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GstBuffer *buf = GST_BUFFER (_data);
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GstSnapshot *snapshot;
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guchar *data;
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gulong size;
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gint i;
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png_byte *row_pointers[MAX_HEIGHT];
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FILE *fp;
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g_return_if_fail (pad != NULL);
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g_return_if_fail (GST_IS_PAD (pad));
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g_return_if_fail (buf != NULL);
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snapshot = GST_SNAPSHOT (GST_OBJECT_PARENT (pad));
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data = GST_BUFFER_DATA (buf);
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size = GST_BUFFER_SIZE (buf);
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GST_DEBUG ("snapshot: have buffer of %d\n", GST_BUFFER_SIZE (buf));
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snapshot->cur_frame++;
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if (snapshot->cur_frame == snapshot->frame ||
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snapshot->snapshot_asked == TRUE) {
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snapshot->snapshot_asked = FALSE;
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GST_INFO ("dumpfile : %s\n", snapshot->location);
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fp = fopen (snapshot->location, "wb");
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if (fp == NULL)
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g_warning (" Can not open %s\n", snapshot->location);
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else {
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png_set_filter (snapshot->png_struct_ptr, 0,
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PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
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png_init_io (snapshot->png_struct_ptr, fp);
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png_set_compression_level (snapshot->png_struct_ptr, 9);
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png_set_IHDR (snapshot->png_struct_ptr,
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snapshot->png_info_ptr,
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snapshot->width,
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snapshot->height,
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snapshot->to_bpp / 3,
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PNG_COLOR_TYPE_RGB,
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PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
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for (i = 0; i < snapshot->height; i++)
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row_pointers[i] = data + (snapshot->width * i * snapshot->to_bpp / 8);
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png_write_info (snapshot->png_struct_ptr, snapshot->png_info_ptr);
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png_write_image (snapshot->png_struct_ptr, row_pointers);
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png_write_end (snapshot->png_struct_ptr, NULL);
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png_destroy_info_struct (snapshot->png_struct_ptr,
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&snapshot->png_info_ptr);
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png_destroy_write_struct (&snapshot->png_struct_ptr, (png_infopp) NULL);
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fclose (fp);
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g_signal_emit (G_OBJECT (snapshot),
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gst_snapshot_signals[SNAPSHOT_SIGNAL], 0);
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}
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}
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gst_pad_push (snapshot->srcpad, GST_DATA (buf));
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}
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static void
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gst_snapshot_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstSnapshot *snapshot;
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g_return_if_fail (GST_IS_SNAPSHOT (object));
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snapshot = GST_SNAPSHOT (object);
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switch (prop_id) {
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case ARG_LOCATION:
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snapshot->location = g_strdup (g_value_get_string (value));
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break;
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case ARG_FRAME:
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snapshot->frame = g_value_get_long (value);
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break;
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default:
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break;
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}
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}
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static void
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gst_snapshot_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstSnapshot *snapshot;
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g_return_if_fail (GST_IS_SNAPSHOT (object));
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snapshot = GST_SNAPSHOT (object);
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switch (prop_id) {
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case ARG_LOCATION:
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g_value_set_string (value, snapshot->location);
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break;
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case ARG_FRAME:
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g_value_set_long (value, snapshot->frame);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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if (!gst_element_register (plugin, "snapshot", GST_RANK_NONE,
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GST_TYPE_SNAPSHOT))
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return FALSE;
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return TRUE;
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"snapshot",
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"Dump a frame to a png file",
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plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)
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