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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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285 lines
8.4 KiB
C
285 lines
8.4 KiB
C
/* 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/base.h>
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#include <gst/pbutils/pbutils.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 gboolean gst_png_parse_event (GstBaseParse * parse, GstEvent * event);
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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 GstFlowReturn gst_png_parse_pre_push_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame);
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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_static_pad_template (gstelement_class, &srctemplate);
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gst_element_class_add_static_pad_template (gstelement_class, &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->sink_event = GST_DEBUG_FUNCPTR (gst_png_parse_event);
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parse_class->handle_frame = GST_DEBUG_FUNCPTR (gst_png_parse_handle_frame);
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parse_class->pre_push_frame =
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GST_DEBUG_FUNCPTR (gst_png_parse_pre_push_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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GST_PAD_SET_ACCEPT_INTERSECT (GST_BASE_PARSE_SINK_PAD (pngparse));
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GST_PAD_SET_ACCEPT_TEMPLATE (GST_BASE_PARSE_SINK_PAD (pngparse));
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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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pngparse->sent_codec_tag = FALSE;
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return TRUE;
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}
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static gboolean
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gst_png_parse_event (GstBaseParse * parse, GstEvent * event)
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{
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gboolean res;
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res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_STOP:
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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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break;
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default:
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break;
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}
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return res;
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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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guint width = 0, height = 0;
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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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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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GST_TRACE_OBJECT (parse, "%" GST_FOURCC_FORMAT " chunk, %u bytes",
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GST_FOURCC_ARGS (code), length);
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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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} else if (code == GST_MAKE_FOURCC ('I', 'D', 'A', 'T')) {
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gst_base_parse_set_min_frame_size (parse,
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gst_byte_reader_get_pos (&reader) + 4 + length + 12);
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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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/* 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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if (pngparse->width != width || pngparse->height != height) {
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GstCaps *caps, *sink_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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sink_caps =
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gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (pngparse));
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if (sink_caps) {
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GstStructure *st;
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gint fr_num, fr_denom;
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st = gst_caps_get_structure (sink_caps, 0);
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if (st
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&& gst_structure_get_fraction (st, "framerate", &fr_num,
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&fr_denom)) {
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gst_caps_set_simple (caps,
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"framerate", GST_TYPE_FRACTION, fr_num, fr_denom, NULL);
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} else {
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GST_WARNING_OBJECT (pngparse, "No framerate set");
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}
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gst_caps_unref (sink_caps);
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}
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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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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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static GstFlowReturn
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gst_png_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
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{
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GstPngParse *pngparse = GST_PNG_PARSE (parse);
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if (!pngparse->sent_codec_tag) {
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GstTagList *taglist;
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GstCaps *caps;
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/* codec tag */
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caps = gst_pad_get_current_caps (GST_BASE_PARSE_SRC_PAD (parse));
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if (G_UNLIKELY (caps == NULL)) {
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if (GST_PAD_IS_FLUSHING (GST_BASE_PARSE_SRC_PAD (parse))) {
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GST_INFO_OBJECT (parse, "Src pad is flushing");
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return GST_FLOW_FLUSHING;
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} else {
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GST_INFO_OBJECT (parse, "Src pad is not negotiated!");
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return GST_FLOW_NOT_NEGOTIATED;
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}
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}
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taglist = gst_tag_list_new_empty ();
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gst_pb_utils_add_codec_description_to_tag_list (taglist,
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GST_TAG_VIDEO_CODEC, caps);
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gst_caps_unref (caps);
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gst_base_parse_merge_tags (parse, taglist, GST_TAG_MERGE_REPLACE);
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gst_tag_list_unref (taglist);
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/* also signals the end of first-frame processing */
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pngparse->sent_codec_tag = TRUE;
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}
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return GST_FLOW_OK;
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}
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