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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* Filter:
* Copyright (C) 2000 Donald A. Graft
*
* 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 <gst/gst.h>
#include "gstpngenc.h"
#define MAX_HEIGHT 4096
GstElementDetails gst_pngenc_details = {
"",
"Filter/Video/Effect",
"LGPL",
"Encode a video frame to a .png image"
VERSION,
"Jeremy SIMON <jsimon13@yahoo.fr>",
"(C) 2000 Donald Graft",
};
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
static void gst_pngenc_class_init (GstPngEncClass *klass);
static void gst_pngenc_init (GstPngEnc *pngenc);
static void gst_pngenc_chain (GstPad *pad, GstBuffer *buf);
static GstElementClass *parent_class = NULL;
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_pngenc_get_type (void)
{
static GType pngenc_type = 0;
if (!pngenc_type) {
static const GTypeInfo pngenc_info = {
sizeof (GstPngEncClass), NULL,
NULL,
(GClassInitFunc) gst_pngenc_class_init,
NULL,
NULL,
sizeof (GstPngEnc),
0,
(GInstanceInitFunc) gst_pngenc_init,
};
pngenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstPngEnc",
&pngenc_info, 0);
}
return pngenc_type;
}
static void
gst_pngenc_class_init (GstPngEncClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
}
static GstPadLinkReturn
gst_pngenc_sinklink (GstPad *pad, GstCaps *caps)
{
GstPngEnc *pngenc;
pngenc = GST_PNGENC (gst_pad_get_parent (pad));
if (!GST_CAPS_IS_FIXED (caps))
return GST_PAD_LINK_DELAYED;
gst_caps_get_int (caps, "width", &pngenc->width);
gst_caps_get_int (caps, "height", &pngenc->height);
gst_caps_get_int (caps, "bpp", &pngenc->bpp);
return gst_pad_try_set_caps (pngenc->srcpad, caps);
}
static void
gst_pngenc_init (GstPngEnc * pngenc)
{
pngenc->sinkpad = gst_pad_new_from_template (pngenc_sink_template, "sink");
gst_element_add_pad (GST_ELEMENT (pngenc), pngenc->sinkpad);
pngenc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (pngenc), pngenc->srcpad);
gst_pad_set_chain_function (pngenc->sinkpad, gst_pngenc_chain);
gst_pad_set_link_function (pngenc->sinkpad, gst_pngenc_sinklink);
pngenc->png_struct_ptr = NULL;
pngenc->png_info_ptr = NULL;
}
void user_flush_data (png_structp png_ptr)
{
GstPngEnc *pngenc;
pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
gst_pad_push (pngenc->srcpad, GST_BUFFER (gst_event_new (GST_EVENT_FLUSH)));
}
void user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
{
GstBuffer *buffer;
GstPngEnc *pngenc;
pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
buffer = gst_buffer_new();
GST_BUFFER_DATA (buffer) = g_memdup (data, length);
GST_BUFFER_SIZE (buffer) = length;
if (pngenc->buffer_out)
{
pngenc->buffer_out = gst_buffer_merge (pngenc->buffer_out, buffer);
gst_buffer_unref (buffer);
}
else
pngenc->buffer_out = buffer;
}
static void
gst_pngenc_chain (GstPad *pad, GstBuffer *buf)
{
GstPngEnc *pngenc;
gint row_index;
png_byte *row_pointers[MAX_HEIGHT];
GstEvent *event;
pngenc = GST_PNGENC (gst_pad_get_parent (pad));
pngenc->buffer_out = NULL;
if (!GST_PAD_IS_USABLE (pngenc->srcpad))
{
gst_buffer_unref (buf);
return;
}
/* initialize png struct stuff */
pngenc->png_struct_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
(png_voidp) NULL, user_error_fn, user_warning_fn);
/* FIXME: better error handling */
if (pngenc->png_struct_ptr == NULL)
g_warning ("Failed to initialize png structure");
pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
if (!pngenc->png_info_ptr)
{
png_destroy_read_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL,
(png_infopp) NULL);
}
/* non-0 return is from a longjmp inside of libpng */
if (setjmp (pngenc->png_struct_ptr->jmpbuf) != 0)
{
GST_DEBUG ("returning from longjmp");
png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
return;
}
png_set_filter (pngenc->png_struct_ptr, 0,
PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
png_set_compression_level (pngenc->png_struct_ptr, 9);
png_set_IHDR(
pngenc->png_struct_ptr,
pngenc->png_info_ptr,
pngenc->width,
pngenc->height,
pngenc->bpp / 3,
PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT
);
png_set_write_fn (pngenc->png_struct_ptr, pngenc,
(png_rw_ptr) user_write_data, user_flush_data);
for (row_index = 0; row_index < pngenc->height; row_index++)
row_pointers[row_index] = GST_BUFFER_DATA (buf) +
(pngenc->width * row_index * pngenc->bpp / 8);
png_write_info (pngenc->png_struct_ptr, pngenc->png_info_ptr);
png_write_image (pngenc->png_struct_ptr, row_pointers);
png_write_end (pngenc->png_struct_ptr, NULL);
user_flush_data (pngenc->png_struct_ptr);
png_destroy_info_struct (pngenc->png_struct_ptr, &pngenc->png_info_ptr);
png_destroy_write_struct (&pngenc->png_struct_ptr, (png_infopp) NULL);
gst_pad_push (pngenc->srcpad, pngenc->buffer_out);
/* send EOS event, since a frame has been pushed out */
event = gst_event_new (GST_EVENT_EOS);
gst_pad_push (pngenc->srcpad, GST_BUFFER (event));
gst_buffer_unref (buf);
}
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