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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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videoparsers: Add png file parser
https://bugzilla.gnome.org/show_bug.cgi?id=690639
This commit is contained in:
parent
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commit
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4 changed files with 258 additions and 0 deletions
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@ -5,6 +5,7 @@ libgstvideoparsersbad_la_SOURCES = plugin.c \
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gstdiracparse.c dirac_parse.c \
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gstdiracparse.c dirac_parse.c \
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gsth264parse.c gstmpegvideoparse.c \
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gsth264parse.c gstmpegvideoparse.c \
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gstmpeg4videoparse.c \
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gstmpeg4videoparse.c \
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gstpngparse.c \
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gstvc1parse.c
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gstvc1parse.c
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libgstvideoparsersbad_la_CFLAGS = \
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libgstvideoparsersbad_la_CFLAGS = \
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@ -27,6 +28,7 @@ noinst_HEADERS = gsth263parse.h h263parse.h \
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gstdiracparse.h dirac_parse.h \
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gstdiracparse.h dirac_parse.h \
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gsth264parse.h gstmpegvideoparse.h \
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gsth264parse.h gstmpegvideoparse.h \
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gstmpeg4videoparse.h \
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gstmpeg4videoparse.h \
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gstpngparse.h \
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gstvc1parse.h
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gstvc1parse.h
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Android.mk: Makefile.am $(BUILT_SOURCES)
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Android.mk: Makefile.am $(BUILT_SOURCES)
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192
gst/videoparsers/gstpngparse.c
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192
gst/videoparsers/gstpngparse.c
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@ -0,0 +1,192 @@
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/* GStreamer PNG Parser
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* Copyright (C) <2013> Collabora Ltd
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* @author Olivier Crete <olivier.crete@collabora.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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 "gstpngparse.h"
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#include <gst/base/gstbytereader.h>
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#define PNG_SIGNATURE G_GUINT64_CONSTANT (0x89504E470D0A1A0A)
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GST_DEBUG_CATEGORY (png_parse_debug);
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#define GST_CAT_DEFAULT png_parse_debug
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static GstStaticPadTemplate srctemplate =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("image/png, width = (int)[1, MAX], height = (int)[1, MAX],"
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"parsed = (boolean) true")
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);
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static GstStaticPadTemplate sinktemplate =
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GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("image/png")
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);
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#define parent_class gst_png_parse_parent_class
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G_DEFINE_TYPE (GstPngParse, gst_png_parse, GST_TYPE_BASE_PARSE);
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static gboolean gst_png_parse_start (GstBaseParse * parse);
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static GstFlowReturn gst_png_parse_handle_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame, gint * skipsize);
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static void
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gst_png_parse_class_init (GstPngParseClass * klass)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
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GST_DEBUG_CATEGORY_INIT (png_parse_debug, "pngparse", 0, "png parser");
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&srctemplate));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&sinktemplate));
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gst_element_class_set_static_metadata (gstelement_class, "PNG parser",
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"Codec/Parser/Video/Image",
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"Parses PNG files", "Olivier Crete <olivier.crete@collabora.com>");
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/* Override BaseParse vfuncs */
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parse_class->start = GST_DEBUG_FUNCPTR (gst_png_parse_start);
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parse_class->handle_frame = GST_DEBUG_FUNCPTR (gst_png_parse_handle_frame);
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}
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static void
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gst_png_parse_init (GstPngParse * pngparse)
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{
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}
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static gboolean
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gst_png_parse_start (GstBaseParse * parse)
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{
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GstPngParse *pngparse = GST_PNG_PARSE (parse);
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GST_DEBUG_OBJECT (pngparse, "start");
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/* the start code and at least 2 empty frames (IHDR and IEND) */
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gst_base_parse_set_min_frame_size (parse, 8 + 12 + 12);
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pngparse->width = 0;
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pngparse->height = 0;
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return TRUE;
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}
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static GstFlowReturn
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gst_png_parse_handle_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame, gint * skipsize)
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{
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GstPngParse *pngparse = GST_PNG_PARSE (parse);
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GstMapInfo map;
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GstByteReader reader;
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GstFlowReturn ret = GST_FLOW_OK;
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guint64 signature;
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gst_buffer_map (frame->buffer, &map, GST_MAP_READ);
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gst_byte_reader_init (&reader, map.data, map.size);
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if (!gst_byte_reader_peek_uint64_be (&reader, &signature))
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goto beach;
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if (signature != PNG_SIGNATURE) {
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for (;;) {
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guint offset;
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offset = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
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0x89504E47, 0, gst_byte_reader_get_remaining (&reader));
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if (offset == -1) {
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*skipsize = gst_byte_reader_get_remaining (&reader) - 4;
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goto beach;
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}
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gst_byte_reader_skip (&reader, offset);
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if (!gst_byte_reader_peek_uint64_be (&reader, &signature))
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goto beach;
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if (signature == PNG_SIGNATURE) {
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/* We're skipping, go out, we'll be back */
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*skipsize = gst_byte_reader_get_pos (&reader);
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goto beach;
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}
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gst_byte_reader_skip (&reader, 4);
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}
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}
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gst_byte_reader_skip (&reader, 8);
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for (;;) {
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guint32 length;
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guint32 code;
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guint width, height;
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if (!gst_byte_reader_get_uint32_be (&reader, &length))
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goto beach;
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if (!gst_byte_reader_get_uint32_le (&reader, &code))
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goto beach;
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if (code == GST_MAKE_FOURCC ('I', 'H', 'D', 'R')) {
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if (!gst_byte_reader_get_uint32_be (&reader, &width))
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goto beach;
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if (!gst_byte_reader_get_uint32_be (&reader, &height))
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goto beach;
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length -= 8;
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}
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if (!gst_byte_reader_skip (&reader, length + 4))
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goto beach;
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if (code == GST_MAKE_FOURCC ('I', 'E', 'N', 'D')) {
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if (pngparse->width != width || pngparse->height != height) {
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GstCaps *caps;
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pngparse->height = height;
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pngparse->width = width;
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caps = gst_caps_new_simple ("image/png",
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"width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL);
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if (!gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps)) {
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ret = GST_FLOW_NOT_NEGOTIATED;
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}
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gst_caps_unref (caps);
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if (ret != GST_FLOW_OK)
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goto beach;
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}
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gst_buffer_unmap (frame->buffer, &map);
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return gst_base_parse_finish_frame (parse, frame,
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gst_byte_reader_get_pos (&reader));
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}
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}
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beach:
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gst_buffer_unmap (frame->buffer, &map);
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return ret;
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}
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61
gst/videoparsers/gstpngparse.h
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61
gst/videoparsers/gstpngparse.h
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@ -0,0 +1,61 @@
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/* GStreamer PNG Parser
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* Copyright (C) <2013> Collabora Ltd
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* @author Olivier Crete <olivier.crete@collabora.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_PNG_PARSE_H__
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#define __GST_PNG_PARSE_H__
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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#include <gst/base/gstbaseparse.h>
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G_BEGIN_DECLS
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#define GST_TYPE_PNG_PARSE \
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(gst_png_parse_get_type())
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#define GST_PNG_PARSE(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PNG_PARSE,GstPngParse))
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#define GST_PNG_PARSE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PNG_PARSE,GstPngParseClass))
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#define GST_IS_PNG_PARSE(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PNG_PARSE))
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#define GST_IS_PNG_PARSE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PNG_PARSE))
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GType gst_png_parse_get_type (void);
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typedef struct _GstPngParse GstPngParse;
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typedef struct _GstPngParseClass GstPngParseClass;
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struct _GstPngParse
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{
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GstBaseParse baseparse;
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guint width;
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guint height;
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};
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struct _GstPngParseClass
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{
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GstBaseParseClass parent_class;
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};
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G_END_DECLS
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#endif
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@ -27,6 +27,7 @@
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#include "gstdiracparse.h"
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#include "gstdiracparse.h"
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#include "gstmpegvideoparse.h"
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#include "gstmpegvideoparse.h"
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#include "gstmpeg4videoparse.h"
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#include "gstmpeg4videoparse.h"
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#include "gstpngparse.h"
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#include "gstvc1parse.h"
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#include "gstvc1parse.h"
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static gboolean
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static gboolean
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@ -44,6 +45,8 @@ plugin_init (GstPlugin * plugin)
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GST_RANK_PRIMARY + 1, GST_TYPE_MPEGVIDEO_PARSE);
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GST_RANK_PRIMARY + 1, GST_TYPE_MPEGVIDEO_PARSE);
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ret |= gst_element_register (plugin, "mpeg4videoparse",
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ret |= gst_element_register (plugin, "mpeg4videoparse",
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GST_RANK_PRIMARY + 1, GST_TYPE_MPEG4VIDEO_PARSE);
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GST_RANK_PRIMARY + 1, GST_TYPE_MPEG4VIDEO_PARSE);
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ret |= gst_element_register (plugin, "pngparse",
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GST_RANK_PRIMARY, GST_TYPE_PNG_PARSE);
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ret |= gst_element_register (plugin, "vc1parse",
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ret |= gst_element_register (plugin, "vc1parse",
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GST_RANK_NONE, GST_TYPE_VC1_PARSE);
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GST_RANK_NONE, GST_TYPE_VC1_PARSE);
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