mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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46814db753
Original commit message from CVS: clean up
244 lines
6.1 KiB
C
244 lines
6.1 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* Filter:
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* Copyright (C) 2000 Donald A. Graft
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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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*/
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#include <string.h>
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#include <gst/gst.h>
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#include "gstpngenc.h"
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#define MAX_HEIGHT 4096
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GstElementDetails gst_pngenc_details = {
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"",
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"Filter/Video/Effect",
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"LGPL",
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"Encode a video frame to a .png image"
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VERSION,
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"Jeremy SIMON <jsimon13@yahoo.fr>",
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"(C) 2000 Donald Graft",
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};
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/* Filter signals and args */
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enum
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{
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/* FILL ME */
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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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};
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static void gst_pngenc_class_init (GstPngEncClass *klass);
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static void gst_pngenc_init (GstPngEnc *pngenc);
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static void gst_pngenc_chain (GstPad *pad, GstBuffer *buf);
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static GstElementClass *parent_class = NULL;
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static void 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 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 gst_pngenc_get_type (void)
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{
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static GType pngenc_type = 0;
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if (!pngenc_type) {
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static const GTypeInfo pngenc_info = {
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sizeof (GstPngEncClass), NULL,
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NULL,
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(GClassInitFunc) gst_pngenc_class_init,
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NULL,
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NULL,
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sizeof (GstPngEnc),
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0,
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(GInstanceInitFunc) gst_pngenc_init,
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};
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pngenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstPngEnc",
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&pngenc_info, 0);
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}
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return pngenc_type;
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}
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static void
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gst_pngenc_class_init (GstPngEncClass *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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}
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static GstPadLinkReturn
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gst_pngenc_sinklink (GstPad *pad, GstCaps *caps)
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{
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GstPngEnc *pngenc;
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pngenc = GST_PNGENC (gst_pad_get_parent (pad));
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if (!GST_CAPS_IS_FIXED (caps))
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return GST_PAD_LINK_DELAYED;
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gst_caps_get_int (caps, "width", &pngenc->width);
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gst_caps_get_int (caps, "height", &pngenc->height);
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gst_caps_get_int (caps, "bpp", &pngenc->bpp);
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return gst_pad_try_set_caps (pngenc->srcpad, caps);
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}
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static void
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gst_pngenc_init (GstPngEnc * pngenc)
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{
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pngenc->sinkpad = gst_pad_new_from_template (pngenc_sink_template, "sink");
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gst_element_add_pad (GST_ELEMENT (pngenc), pngenc->sinkpad);
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pngenc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
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gst_element_add_pad (GST_ELEMENT (pngenc), pngenc->srcpad);
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gst_pad_set_chain_function (pngenc->sinkpad, gst_pngenc_chain);
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gst_pad_set_link_function (pngenc->sinkpad, gst_pngenc_sinklink);
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pngenc->png_struct_ptr = NULL;
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pngenc->png_info_ptr = NULL;
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}
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void user_flush_data (png_structp png_ptr)
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{
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GstPngEnc *pngenc;
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pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
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gst_pad_push (pngenc->srcpad, GST_BUFFER (gst_event_new (GST_EVENT_FLUSH)));
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}
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void user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
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{
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GstBuffer *buffer;
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GstPngEnc *pngenc;
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pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
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buffer = gst_buffer_new();
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GST_BUFFER_DATA (buffer) = g_memdup (data, length);
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GST_BUFFER_SIZE (buffer) = length;
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if (pngenc->buffer_out)
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{
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pngenc->buffer_out = gst_buffer_merge (pngenc->buffer_out, buffer);
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gst_buffer_unref (buffer);
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}
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else
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pngenc->buffer_out = buffer;
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}
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static void
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gst_pngenc_chain (GstPad *pad, GstBuffer *buf)
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{
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GstPngEnc *pngenc;
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gint row_index;
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png_byte *row_pointers[MAX_HEIGHT];
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GstEvent *event;
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pngenc = GST_PNGENC (gst_pad_get_parent (pad));
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pngenc->buffer_out = NULL;
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if (!GST_PAD_IS_USABLE (pngenc->srcpad))
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{
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gst_buffer_unref (buf);
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return;
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}
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/* initialize png struct stuff */
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pngenc->png_struct_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
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(png_voidp) NULL, user_error_fn, user_warning_fn);
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/* FIXME: better error handling */
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if (pngenc->png_struct_ptr == NULL)
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g_warning ("Failed to initialize png structure");
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pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
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if (!pngenc->png_info_ptr)
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{
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png_destroy_read_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL,
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(png_infopp) NULL);
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}
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/* non-0 return is from a longjmp inside of libpng */
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if (setjmp (pngenc->png_struct_ptr->jmpbuf) != 0)
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{
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GST_DEBUG (GST_CAT_PLUGIN_INFO, "returning from longjmp");
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png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
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return;
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}
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png_set_filter (pngenc->png_struct_ptr, 0,
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PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
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png_set_compression_level (pngenc->png_struct_ptr, 9);
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png_set_IHDR(
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pngenc->png_struct_ptr,
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pngenc->png_info_ptr,
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pngenc->width,
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pngenc->height,
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pngenc->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,
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PNG_FILTER_TYPE_DEFAULT
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);
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png_set_write_fn (pngenc->png_struct_ptr, pngenc,
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(png_rw_ptr) user_write_data, user_flush_data);
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for (row_index = 0; row_index < pngenc->height; row_index++)
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row_pointers[row_index] = GST_BUFFER_DATA (buf) +
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(pngenc->width * row_index * pngenc->bpp / 8);
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png_write_info (pngenc->png_struct_ptr, pngenc->png_info_ptr);
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png_write_image (pngenc->png_struct_ptr, row_pointers);
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png_write_end (pngenc->png_struct_ptr, NULL);
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user_flush_data (pngenc->png_struct_ptr);
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png_destroy_info_struct (pngenc->png_struct_ptr, &pngenc->png_info_ptr);
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png_destroy_write_struct (&pngenc->png_struct_ptr, (png_infopp) NULL);
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gst_pad_push (pngenc->srcpad, pngenc->buffer_out);
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/* send NEW MEDIA event, since a frame has been pushed out */
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event = gst_event_new (GST_EVENT_NEW_MEDIA);
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gst_pad_send_event (pngenc->srcpad, event);
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gst_buffer_unref (buf);
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}
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