gstreamer/ext/metadata/metadatamuxpng.c
Edgard Lima cf4c5c9655 Fixed element properties and now muxer writes to png also.
Original commit message from CVS:
Fixed element properties and now muxer writes to png also.
2007-12-04 16:42:25 +00:00

289 lines
7.5 KiB
C

/*
* GStreamer
* Copyright 2007 Edgard Lima <edgard.lima@indt.org.br>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Alternatively, the contents of this file may be used under the
* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
* which case the following provisions apply instead of the ones
* mentioned above:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "metadatamuxpng.h"
#include <string.h>
static int
metadatamux_png_reading (PngMuxData * png_data, guint8 ** buf,
guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
guint8 ** next_start, guint32 * next_size);
#define READ(buf, size) ( (size)--, *((buf)++) )
static void
make_crc_table (guint32 crc_table[])
{
guint32 c;
guint16 n, k;
for (n = 0; n < 256; n++) {
c = (guint32) n;
for (k = 0; k < 8; k++) {
if (c & 1)
c = 0xedb88320L ^ (c >> 1);
else
c = c >> 1;
}
crc_table[n] = c;
}
}
static guint32
update_crc (guint32 crc, guint8 * buf, guint32 len)
{
guint32 c = crc;
guint32 n;
guint32 crc_table[256];
/* FIXME: make_crc_table should be done once in life
for speed up */
make_crc_table (crc_table);
for (n = 0; n < len; n++) {
c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
}
return c;
}
/* Return the CRC of the bytes buf[0..len-1]. */
static guint32
calc_crc (guint8 * buf, guint32 len)
{
return update_crc (0xffffffffL, buf, len) ^ 0xffffffffL;
}
static void
metadatamux_wrap_xmp_chunk (MetadataChunk * chunk)
{
static const char XmpHeader[] = "XML:com.adobe.xmp";
guint8 *data = NULL;
guint32 crc;
data = g_new (guint8, 12 + 18 + 4 + chunk->size);
memcpy (data + 8, XmpHeader, 18);
memset (data + 8 + 18, 0x00, 4);
memcpy (data + 8 + 18 + 4, chunk->data, chunk->size);
g_free (chunk->data);
chunk->data = data;
chunk->size += 18 + 4;
data[0] = (chunk->size >> 24) & 0xFF;
data[1] = (chunk->size >> 16) & 0xFF;
data[2] = (chunk->size >> 8) & 0xFF;
data[3] = chunk->size & 0xFF;
data[4] = 'i';
data[5] = 'T';
data[6] = 'X';
data[7] = 't';
crc = calc_crc (data + 4, chunk->size + 4 + 18);
data[chunk->size + 8] = (crc >> 24) & 0xFF;
data[chunk->size + 9] = (crc >> 16) & 0xFF;
data[chunk->size + 10] = (crc >> 8) & 0xFF;
data[chunk->size + 11] = crc & 0xFF;
chunk->size += 12;
}
void
metadatamux_png_lazy_update (PngMuxData * png_data)
{
gsize i;
for (i = 0; i < png_data->inject_chunks->len; ++i) {
if (png_data->inject_chunks->chunk[i].size > 0 &&
png_data->inject_chunks->chunk[i].data) {
switch (png_data->inject_chunks->chunk[i].type) {
case MD_CHUNK_XMP:
{
metadatamux_wrap_xmp_chunk (&png_data->inject_chunks->chunk[i]);
}
break;
default:
GST_ERROR ("Unexpected chunk for PNG muxer.");
break;
}
}
}
}
void
metadatamux_png_init (PngMuxData * png_data,
MetadataChunkArray * strip_chunks, MetadataChunkArray * inject_chunks)
{
png_data->state = PNG_MUX_NULL;
png_data->strip_chunks = strip_chunks;
png_data->inject_chunks = inject_chunks;
}
void
metadatamux_png_dispose (PngMuxData * png_data)
{
png_data->strip_chunks = NULL;
png_data->inject_chunks = NULL;
png_data->state = PNG_MUX_NULL;
}
int
metadatamux_png_parse (PngMuxData * png_data, guint8 * buf,
guint32 * bufsize, const guint32 offset, guint8 ** next_start,
guint32 * next_size)
{
int ret = 0;
guint8 mark[8];
const guint8 *step_buf = buf;
*next_start = buf;
if (png_data->state == PNG_MUX_NULL) {
if (*bufsize < 8) {
*next_size = (buf - *next_start) + 8;
ret = 1;
goto done;
}
mark[0] = READ (buf, *bufsize);
mark[1] = READ (buf, *bufsize);
mark[2] = READ (buf, *bufsize);
mark[3] = READ (buf, *bufsize);
mark[4] = READ (buf, *bufsize);
mark[5] = READ (buf, *bufsize);
mark[6] = READ (buf, *bufsize);
mark[7] = READ (buf, *bufsize);
if (mark[0] != 0x89 || mark[1] != 0x50 || mark[2] != 0x4E || mark[3] != 0x47
|| mark[4] != 0x0D || mark[5] != 0x0A || mark[6] != 0x1A
|| mark[7] != 0x0A) {
ret = -1;
goto done;
}
png_data->state = PNG_MUX_READING;
}
while (ret == 0) {
switch (png_data->state) {
case PNG_MUX_READING:
ret =
metadatamux_png_reading (png_data, &buf, bufsize,
offset, step_buf, next_start, next_size);
break;
case PNG_MUX_DONE:
goto done;
break;
default:
ret = -1;
break;
}
}
done:
return ret;
}
/* look for markers */
static int
metadatamux_png_reading (PngMuxData * png_data, guint8 ** buf,
guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
guint8 ** next_start, guint32 * next_size)
{
int ret = -1;
guint8 mark[4];
guint32 chunk_size = 0;
MetadataChunk chunk;
static const char XmpHeader[] = "XML:com.adobe.xmp";
*next_start = *buf;
if (*bufsize < 8) {
*next_size = (*buf - *next_start) + 8;
ret = 1;
goto done;
}
chunk_size = READ (*buf, *bufsize) << 24;
chunk_size += READ (*buf, *bufsize) << 16;
chunk_size += READ (*buf, *bufsize) << 8;
chunk_size += READ (*buf, *bufsize);
mark[0] = READ (*buf, *bufsize);
mark[1] = READ (*buf, *bufsize);
mark[2] = READ (*buf, *bufsize);
mark[3] = READ (*buf, *bufsize);
if (!(mark[0] == 'I' && mark[1] == 'H' && mark[2] == 'D' && mark[3] == 'R')) {
ret = -1;
png_data->state = PNG_MUX_NULL;
goto done;
}
/* always inject after first chunk (IHDR) */
memset (&chunk, 0x00, sizeof (MetadataChunk));
/* 8(header) + 4(size) +4(id) + chunksize + 4(crc) */
chunk.offset_orig = chunk_size + 20;
chunk.type = MD_CHUNK_XMP;
metadata_chunk_array_append_sorted (png_data->inject_chunks, &chunk);
png_data->state = PNG_MUX_DONE;
ret = 0;
done:
return ret;
}