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/*
* PNG image format
* Copyright (c) 2003 Fabrice Bellard.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 "avformat.h"
#include "libpng/png.h"
extern const uint8_t png_sig[];
static int png_probe(AVProbeData *pd)
{
if (pd->buf_size >= 8 &&
memcmp(pd->buf, png_sig, 8) == 0)
return AVPROBE_SCORE_MAX;
else
return 0;
}
png_voidp PNGAPI
png_memset_check (png_structp png_ptr, png_voidp s1, int value,
png_uint_32 length)
{
png_size_t size;
size = (png_size_t)length;
if ((png_uint_32)size != length)
png_error(png_ptr,"Overflow in png_memset_check.");
return (png_memset (s1, value, size));
}
png_voidp PNGAPI
png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
png_uint_32 length)
{
png_size_t size;
size = (png_size_t)length;
if ((png_uint_32)size != length)
png_error(png_ptr,"Overflow in png_memcpy_check.");
return(png_memcpy (s1, s2, size));
}
void png_error (png_struct *png_ptr, const char *message)
{
longjmp(png_ptr->jmpbuf, 0);
}
void png_warning (png_struct *png_ptr, const char *message)
{
}
void PNGAPI
png_chunk_error(png_structp png_ptr, png_const_charp error_message)
{
char msg[18+64];
// png_format_buffer(png_ptr, msg, error_message);
png_error(png_ptr, msg);
}
void PNGAPI
png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
{
char msg[18+64];
// png_format_buffer(png_ptr, msg, warning_message);
png_warning(png_ptr, msg);
}
void png_read_data (png_struct *png_ptr, png_byte *data, png_uint_32 length)
{
int ret;
ret = get_buffer(png_ptr->io_ptr, data, length);
if (ret != length)
png_error (png_ptr, "Read Error");
}
void *png_malloc (png_struct *png_ptr, png_uint_32 size)
{
return av_malloc(size);
}
void png_free (png_struct *png_ptr, void *ptr)
{
return av_free(ptr);
}
static int png_read(ByteIOContext *f,
int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
{
png_struct png_struct1, *png_ptr;
png_info png_info1, png_info2, *info_ptr, *end_info;
AVImageInfo info1, *info = &info1;
int y, height, ret, row_size;
uint8_t *ptr;
png_ptr = &png_struct1;
png_read_init(png_ptr);
info_ptr = &png_info1;
end_info = &png_info2;
png_info_init(info_ptr);
png_info_init(end_info);
png_ptr->io_ptr = f;
if (setjmp(png_jmpbuf(png_ptr))) {
png_read_destroy (png_ptr, info_ptr, NULL);
return -1;
}
png_read_info (png_ptr, info_ptr);
/* init image info */
info->width = info_ptr->width;
info->height = info_ptr->height;
if (info_ptr->bit_depth == 8 &&
info_ptr->color_type == PNG_COLOR_TYPE_RGB) {
info->pix_fmt = PIX_FMT_RGB24;
row_size = info_ptr->width * 3;
} else if (info_ptr->bit_depth == 8 &&
info_ptr->color_type == PNG_COLOR_TYPE_GRAY) {
info->pix_fmt = PIX_FMT_GRAY8;
row_size = info_ptr->width;
} else if (info_ptr->bit_depth == 1 &&
info_ptr->color_type == PNG_COLOR_TYPE_GRAY) {
info->pix_fmt = PIX_FMT_MONOBLACK;
row_size = (info_ptr->width + 7) >> 3;
} else {
png_read_destroy (png_ptr, info_ptr, NULL);
return -1;
}
ret = alloc_cb(opaque, info);
if (ret) {
png_read_destroy (png_ptr, info_ptr, NULL);
return ret;
}
/* now read the whole image */
png_start_read_image (png_ptr);
height = info->height;
ptr = info->pict.data[0];
for (y = 0; y < height; y++) {
png_read_row (png_ptr, NULL, NULL);
memcpy(ptr, png_ptr->row_buf + 1, row_size);
ptr += info->pict.linesize[0];
}
png_read_destroy (png_ptr, info_ptr, NULL);
return 0;
}
void
png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
put_buffer(png_ptr->io_ptr, data, length);
}
static int png_write(ByteIOContext *pb, AVImageInfo *info)
{
png_struct png_struct1, *png_ptr;
png_info png_info1, *info_ptr;
int w, h, y;
uint8_t *ptr;
png_ptr = &png_struct1;
info_ptr = &png_info1;
png_write_init(png_ptr);
png_info_init(info_ptr);
png_ptr->io_ptr = pb;
if (setjmp(png_ptr->jmpbuf)) {
png_write_destroy(png_ptr);
return -1;
}
w = info->width;
h = info->height;
info_ptr->width = w;
info_ptr->height = h;
switch(info->pix_fmt) {
case PIX_FMT_RGB24:
info_ptr->bit_depth = 8;
info_ptr->color_type = PNG_COLOR_TYPE_RGB;
break;
case PIX_FMT_GRAY8:
info_ptr->bit_depth = 8;
info_ptr->color_type = PNG_COLOR_TYPE_GRAY;
break;
case PIX_FMT_MONOBLACK:
info_ptr->bit_depth = 1;
info_ptr->color_type = PNG_COLOR_TYPE_GRAY;
break;
default:
return -1;
}
png_write_info(png_ptr, info_ptr);
ptr = info->pict.data[0];
for(y=0;y<h;y++) {
png_write_row(png_ptr, ptr);
ptr += info->pict.linesize[0];
}
png_write_end(png_ptr, info_ptr);
png_write_destroy(png_ptr);
put_flush_packet(pb);
return 0;
}
AVImageFormat png_image_format = {
"png",
"png",
png_probe,
png_read,
(1 << PIX_FMT_RGB24) | (1 << PIX_FMT_GRAY8) | (1 << PIX_FMT_MONOBLACK),
png_write,
};
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