mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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5540ec23ec
Sprinkle more debug log statements into the code. Move some repeaded string constant into header files and use sizeof instead of manually counted bytes. Add comments.
540 lines
16 KiB
C
540 lines
16 KiB
C
/*
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* GStreamer
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* Copyright 2007 Edgard Lima <edgard.lima@indt.org.br>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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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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/*
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* SECTION: metadatamuxjpeg
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* @short_description: This module provides functions to parse JPEG files in
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* order to write metadata to it.
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*
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* This module parses a JPEG stream to find the places in which metadata (EXIF,
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* IPTC, XMP) chunks would be written. It also wraps metadata chunks with JPEG
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* marks according to the specification.
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*
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* <refsect2>
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* <para>
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* #metadatamux_jpeg_init must be called before any other function in this
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* module and must be paired with a call to #metadatamux_jpeg_dispose.
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* #metadatamux_jpeg_parse is used to parse the stream (find the place
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* metadata chunks should be written to).
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* #metadatamux_jpeg_lazy_update do nothing.
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* </para>
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* <para>
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* EXIF chunks will always be the first chunk (replaces JFIF). IPTC and XMP
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* chunks will be placed or second chunk (after JFIF or EXIF) or third chunk
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* if both (IPTC and XMP) are written to the file.
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* </para>
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* <para>
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* When a EXIF chunk is written to the JPEG stream, if there is a JFIF chunk
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* as the first chunk, it will be stripped out.
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* </para>
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* </refsect2>
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*
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* Last reviewed on 2008-01-24 (0.10.15)
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*/
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/*
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* includes
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*/
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#include "metadatamuxjpeg.h"
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#include "metadataxmp.h"
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#include <string.h>
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#ifdef HAVE_IPTC
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#include <libiptcdata/iptc-jpeg.h>
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#endif
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/*
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* defines and macros
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*/
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#define READ(buf, size) ( (size)--, *((buf)++) )
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/*
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* static helper functions declaration
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*/
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static MetadataParsingReturn
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metadatamux_jpeg_reading (JpegMuxData * jpeg_data, guint8 ** buf,
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guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
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guint8 ** next_start, guint32 * next_size);
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static void
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metadatamux_wrap_chunk (MetadataChunk * chunk, const guint8 * buf,
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guint32 buf_size, guint8 a, guint8 b);
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#ifdef HAVE_IPTC
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static gboolean
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metadatamux_wrap_iptc_with_ps3 (unsigned char **buf, unsigned int *buf_size);
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#endif /* #ifdef HAVE_IPTC */
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/*
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* extern functions implementations
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*/
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/*
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* metadatamux_jpeg_init:
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* @jpeg_data: [in] jpeg data handler to be inited
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* @strip_chunks: Array of chunks (offset and size) marked for removal
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* @inject_chunks: Array of chunks (offset, data, size) marked for injection
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* adapter (@exif_adpt, @iptc_adpt, @xmp_adpt). Or FALSE if should also put
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* them on @strip_chunks.
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*
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* Init jpeg data handle.
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* This function must be called before any other function from this module.
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* This function must not be called twice without call to
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* #metadatamux_jpeg_dispose beteween them.
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* @see_also: #metadatamux_jpeg_dispose #metadatamux_jpeg_parse
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*
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* Returns: nothing
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*/
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void
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metadatamux_jpeg_init (JpegMuxData * jpeg_data,
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MetadataChunkArray * strip_chunks, MetadataChunkArray * inject_chunks)
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{
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jpeg_data->state = JPEG_MUX_NULL;
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jpeg_data->strip_chunks = strip_chunks;
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jpeg_data->inject_chunks = inject_chunks;
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}
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/*
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* metadatamux_jpeg_dispose:
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* @jpeg_data: [in] jpeg data handler to be freed
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*
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* Call this function to free any resource allocated by #metadatamux_jpeg_init
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* @see_also: #metadatamux_jpeg_init
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*
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* Returns: nothing
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*/
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void
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metadatamux_jpeg_dispose (JpegMuxData * jpeg_data)
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{
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jpeg_data->inject_chunks = NULL;
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jpeg_data->strip_chunks = NULL;
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jpeg_data->state = JPEG_MUX_NULL;
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}
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/*
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* metadatamux_jpeg_parse:
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* @jpeg_data: [in] jpeg data handle
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* @buf: [in] data to be parsed
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* @bufsize: [in] size of @buf in bytes
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* @offset: is the offset where @buf starts from the beginnig of the whole
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* stream
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* @next_start: is a pointer after @buf which indicates where @buf should start
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* on the next call to this function. It means, that after returning, this
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* function has consumed *@next_start - @buf bytes. Which also means
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* that @offset should also be incremanted by (*@next_start - @buf) for the
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* next time.
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* @next_size: [out] number of minimal bytes in @buf for the next call to this
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* function
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*
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* This function is used to parse a JPEG stream step-by-step incrementally.
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* Basically this function works like a state machine, that will run in a loop
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* while there is still bytes in @buf to be read or it has finished parsing.
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* If the it hasn't parsed yet and there is no more data in @buf, then the
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* current state is saved and a indication will be make about the buffer to
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* be passed by the caller function.
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* @see_also: #metadatamux_jpeg_init
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*
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* Returns:
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* <itemizedlist>
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* <listitem><para>%META_PARSING_ERROR
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* </para></listitem>
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* <listitem><para>%META_PARSING_DONE if parse has finished. Now strip and
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* inject chunks has been found
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* </para></listitem>
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* <listitem><para>%META_PARSING_NEED_MORE_DATA if this function should be
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* called again (look @next_start and @next_size)
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* </para></listitem>
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* </itemizedlist>
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*/
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MetadataParsingReturn
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metadatamux_jpeg_parse (JpegMuxData * jpeg_data, guint8 * buf,
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guint32 * bufsize, const guint32 offset, guint8 ** next_start,
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guint32 * next_size)
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{
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int ret = META_PARSING_DONE;
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const guint8 *step_buf = buf;
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*next_start = buf;
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if (jpeg_data->state == JPEG_MUX_NULL) {
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guint8 mark[2];
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if (*bufsize < 2) {
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GST_INFO ("need more data");
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*next_size = (buf - *next_start) + 2;
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ret = META_PARSING_NEED_MORE_DATA;
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goto done;
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}
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mark[0] = READ (buf, *bufsize);
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mark[1] = READ (buf, *bufsize);
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if (mark[0] != 0xFF || mark[1] != 0xD8) {
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GST_INFO ("missing marker");
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ret = META_PARSING_ERROR;
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goto done;
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}
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jpeg_data->state = JPEG_MUX_READING;
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}
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while (ret == META_PARSING_DONE) {
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switch (jpeg_data->state) {
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case JPEG_MUX_READING:
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GST_DEBUG ("start reading");
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ret =
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metadatamux_jpeg_reading (jpeg_data, &buf, bufsize,
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offset, step_buf, next_start, next_size);
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break;
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case JPEG_MUX_DONE:
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goto done;
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break;
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default:
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GST_INFO ("invalid parser state");
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ret = META_PARSING_ERROR;
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break;
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}
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}
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done:
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GST_INFO ("finishing: %d", ret);
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return ret;
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}
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/*
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* metadatamux_jpeg_lazy_update:
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* @jpeg_data: [in] jpeg data handle
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*
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* This function wrap metadata chunk with proper JPEG marks. In case of IPTC
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* it will be wrapped by PhotoShop and then by JPEG mark.
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* @see_also: #metadata_lazy_update
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*
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* Returns: nothing
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*/
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void
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metadatamux_jpeg_lazy_update (JpegMuxData * jpeg_data)
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{
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gsize i;
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gboolean has_exif = FALSE;
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MetadataChunkArray *chunks = jpeg_data->inject_chunks;
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GST_INFO ("checking %d chunks", chunks->len);
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for (i = 0; i < chunks->len; ++i) {
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GST_INFO ("checking chunk[%" G_GSIZE_FORMAT "], type=%d, len=%u",
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i, chunks->chunk[i].type, chunks->chunk[i].size);
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if (chunks->chunk[i].size > 0 && chunks->chunk[i].data) {
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switch (chunks->chunk[i].type) {
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case MD_CHUNK_EXIF:
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metadatamux_wrap_chunk (&chunks->chunk[i], NULL, 0, 0xFF, 0xE1);
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has_exif = TRUE;
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break;
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case MD_CHUNK_IPTC:
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#ifdef HAVE_IPTC
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if (metadatamux_wrap_iptc_with_ps3 (&chunks->chunk[i].data,
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&chunks->chunk[i].size)) {
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metadatamux_wrap_chunk (&chunks->chunk[i], NULL, 0, 0xFF, 0xED);
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} else {
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GST_ERROR ("Invalid IPTC chunk\n");
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metadata_chunk_array_remove_by_index (chunks, i);
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continue;
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}
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#endif /* #ifdef HAVE_IPTC */
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break;
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case MD_CHUNK_XMP:
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metadatamux_wrap_chunk (&chunks->chunk[i],
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(guint8 *) XMP_HEADER, sizeof (XMP_HEADER), 0xFF, 0xE1);
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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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}
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if (!has_exif) {
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/* EXIF not injected so not strip JFIF anymore */
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metadata_chunk_array_clear (jpeg_data->strip_chunks);
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}
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}
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/*
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* static helper functions implementation
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*/
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/*
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* metadatamux_jpeg_reading:
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* @jpeg_data: [in] jpeg data handle
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* @buf: [in] data to be parsed. @buf will increment during the parsing step.
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* So it will hold the next byte to be read inside a parsing function or on
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* the next nested parsing function. And so, @bufsize will decrement.
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* @bufsize: [in] size of @buf in bytes. This value will decrement during the
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* parsing for the same reason that @buf will advance.
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* @offset: is the offset where @step_buf starts from the beginnig of the
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* stream
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* @step_buf: holds the pointer to the buffer passed to
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* #metadatamux_jpeg_parse. It means that any point inside this function
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* the offset (related to the beginning of the whole stream) after the last
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* byte read so far is "(*buf - step_buf) + offset"
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* @next_start: is a pointer after @step_buf which indicates where the next
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* call to #metadatamux_jpeg_parse should start on the next call to this
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* function. It means, that after return, this function has
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* consumed *@next_start - @buf bytes. Which also means that @offset should
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* also be incremanted by (*@next_start - @buf) for the next time.
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* @next_size: [out] number of minimal bytes in @buf for the next call to this
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* function
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*
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* This function is used to parse a JPEG stream step-by-step incrementally.
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* If this function quickly finds the place (offset) in which EXIF, IPTC and
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* XMP chunk should be written to.
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* The found places are written to @jpeg_data->inject_chunks
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* @see_also: #metadatamux_jpeg_init
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*
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* Returns:
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* <itemizedlist>
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* <listitem><para>%META_PARSING_ERROR
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* </para></listitem>
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* <listitem><para>%META_PARSING_DONE if parse has finished. Now strip and
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* inject chunks has been found. Or some chunk has been found and should be
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* held or jumped.
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* </para></listitem>
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* <listitem><para>%META_PARSING_NEED_MORE_DATA if this function should be
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* called again (look @next_start and @next_size)
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* </para></listitem>
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* </itemizedlist>
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*/
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static MetadataParsingReturn
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metadatamux_jpeg_reading (JpegMuxData * jpeg_data, guint8 ** buf,
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guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
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guint8 ** next_start, guint32 * next_size)
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{
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int ret = META_PARSING_ERROR;
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guint8 mark[2] = { 0x00, 0x00 };
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guint16 chunk_size = 0;
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gint64 new_chunk_offset = 0;
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MetadataChunk chunk;
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gboolean jfif_found = FALSE;
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static const char JfifHeader[] = "JFIF";
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*next_start = *buf;
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if (*bufsize < 2) {
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GST_INFO ("need more data");
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*next_size = (*buf - *next_start) + 2;
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ret = META_PARSING_NEED_MORE_DATA;
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goto done;
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}
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mark[0] = READ (*buf, *bufsize);
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mark[1] = READ (*buf, *bufsize);
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GST_DEBUG ("parsing JPEG marker : 0x%02x%02x", mark[0], mark[1]);
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if (mark[0] == 0xFF) {
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chunk_size = READ (*buf, *bufsize) << 8;
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chunk_size += READ (*buf, *bufsize);
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if (mark[1] == 0xE0) { /* APP0 - may be JFIF */
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/* FIXME: whats the 14 ? according to
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* http://en.wikipedia.org/wiki/JFIF#JFIF_segment_format
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* its the jfif segment without thumbnails
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*/
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if (chunk_size >= 14 + 2) {
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if (*bufsize < sizeof (JfifHeader)) {
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GST_INFO ("need more data");
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*next_size = (*buf - *next_start) + sizeof (JfifHeader);
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ret = META_PARSING_NEED_MORE_DATA;
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goto done;
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}
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if (0 == memcmp (JfifHeader, *buf, sizeof (JfifHeader))) {
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jfif_found = TRUE;
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}
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} else {
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/* FIXME: should we check if the first chunk is EXIF? */
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GST_INFO ("chunk size too small %u", chunk_size);
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}
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}
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if (!jfif_found) {
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GST_INFO ("no jfif found, will insert it as needed");
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}
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new_chunk_offset = 2;
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/* EXIF will always be in the begining */
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memset (&chunk, 0x00, sizeof (MetadataChunk));
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chunk.offset_orig = 2;
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chunk.type = MD_CHUNK_EXIF;
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metadata_chunk_array_append_sorted (jpeg_data->inject_chunks, &chunk);
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if (jfif_found) {
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/* remove JFIF chunk */
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/* this acation can be canceled with lazy update if no Exif is add */
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memset (&chunk, 0x00, sizeof (MetadataChunk));
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chunk.offset_orig = 2;
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chunk.size = chunk_size + 2; /* chunk size plus app marker */
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chunk.type = MD_CHUNK_UNKNOWN;
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metadata_chunk_array_append_sorted (jpeg_data->strip_chunks, &chunk);
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new_chunk_offset = chunk.offset_orig + chunk.size;
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}
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/* IPTC */
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memset (&chunk, 0x00, sizeof (MetadataChunk));
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chunk.offset_orig = new_chunk_offset;
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chunk.type = MD_CHUNK_IPTC;
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metadata_chunk_array_append_sorted (jpeg_data->inject_chunks, &chunk);
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/* XMP */
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memset (&chunk, 0x00, sizeof (MetadataChunk));
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chunk.offset_orig = new_chunk_offset;
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chunk.type = MD_CHUNK_XMP;
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metadata_chunk_array_append_sorted (jpeg_data->inject_chunks, &chunk);
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jpeg_data->state = JPEG_MUX_DONE;
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ret = META_PARSING_DONE;
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} else {
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GST_INFO ("invalid JPEG chunk");
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ret = META_PARSING_ERROR;
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}
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done:
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return ret;
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}
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/*
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* metadatamux_wrap_chunk:
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* @chunk: chunk to be wrapped
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* @buf: data to inject in the beginning of @chunk->data and after @a and @b
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* @buf_size: size in bytes of @buf
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* @a: together with @b forms the JPEG mark to be injected in the beginning
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* @b: look at @a
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*
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* Wraps a chunk if a JPEG mark (@a@b) and, if @buf_size > 0, with some data
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* (@buf)
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*
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* Returns: nothing
|
|
*/
|
|
|
|
static void
|
|
metadatamux_wrap_chunk (MetadataChunk * chunk, const guint8 * buf,
|
|
guint32 buf_size, guint8 a, guint8 b)
|
|
{
|
|
guint8 *data = g_new (guint8, 4 + buf_size + chunk->size);
|
|
|
|
memcpy (data + 4 + buf_size, chunk->data, chunk->size);
|
|
g_free (chunk->data);
|
|
chunk->data = data;
|
|
chunk->size += 4 + buf_size;
|
|
data[0] = a;
|
|
data[1] = b;
|
|
data[2] = ((chunk->size - 2) >> 8) & 0xFF;
|
|
data[3] = (chunk->size - 2) & 0xFF;
|
|
if (buf && buf_size) {
|
|
memcpy (data + 4, buf, buf_size);
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_IPTC
|
|
static gboolean
|
|
metadatamux_wrap_iptc_with_ps3 (unsigned char **buf, unsigned int *buf_size)
|
|
{
|
|
unsigned int out_size = *buf_size + 4096;
|
|
unsigned char *outbuf = g_new (unsigned char, out_size);
|
|
int size_written;
|
|
gboolean ret = TRUE;
|
|
|
|
size_written =
|
|
iptc_jpeg_ps3_save_iptc (NULL, 0, *buf, *buf_size, outbuf, out_size);
|
|
|
|
g_free (*buf);
|
|
*buf = NULL;
|
|
*buf_size = 0;
|
|
|
|
if (size_written < 0) {
|
|
g_free (outbuf);
|
|
ret = FALSE;
|
|
} else {
|
|
*buf_size = size_written;
|
|
*buf = outbuf;
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
#endif /* #ifdef HAVE_IPTC */
|