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/*
* .Y.U.V 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
static int sizes[][2] = {
{ 640, 480 },
{ 720, 480 },
{ 720, 576 },
{ 352, 288 },
{ 352, 240 },
{ 160, 128 },
{ 512, 384 },
{ 640, 352 },
{ 640, 240 },
};
static int infer_size(int *width_ptr, int *height_ptr, int size)
{
int i;
for(i=0;i<sizeof(sizes)/sizeof(sizes[0]);i++) {
if ((sizes[i][0] * sizes[i][1]) == size) {
*width_ptr = sizes[i][0];
*height_ptr = sizes[i][1];
return 0;
}
}
return -1;
}
static int yuv_read(ByteIOContext *f,
int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
{
ByteIOContext pb1, *pb = &pb1;
int img_size, ret;
char fname[1024], *p;
int size;
URLContext *h;
AVImageInfo info1, *info = &info1;
img_size = url_fsize(f);
/* XXX: hack hack */
h = url_fileno(f);
url_get_filename(h, fname, sizeof(fname));
if (infer_size(&info->width, &info->height, img_size) < 0) {
return AVERROR_IO;
}
info->pix_fmt = PIX_FMT_YUV420P;
ret = alloc_cb(opaque, info);
if (ret)
return ret;
size = info->width * info->height;
p = strrchr(fname, '.');
if (!p || p[1] != 'Y')
return AVERROR_IO;
get_buffer(f, info->pict.data[0], size);
p[1] = 'U';
if (url_fopen(pb, fname, URL_RDONLY) < 0)
return AVERROR_IO;
get_buffer(pb, info->pict.data[1], size / 4);
url_fclose(pb);
p[1] = 'V';
if (url_fopen(pb, fname, URL_RDONLY) < 0)
return AVERROR_IO;
get_buffer(pb, info->pict.data[2], size / 4);
url_fclose(pb);
return 0;
}
static int yuv_write(ByteIOContext *pb2, AVImageInfo *info)
{
ByteIOContext pb1, *pb;
char fname[1024], *p;
int i, j, width, height;
uint8_t *ptr;
URLContext *h;
static const char *ext = "YUV";
/* XXX: hack hack */
h = url_fileno(pb2);
url_get_filename(h, fname, sizeof(fname));
p = strrchr(fname, '.');
if (!p || p[1] != 'Y')
return AVERROR_IO;
width = info->width;
height = info->height;
for(i=0;i<3;i++) {
if (i == 1) {
width >>= 1;
height >>= 1;
}
if (i >= 1) {
pb = &pb1;
p[1] = ext[i];
if (url_fopen(pb, fname, URL_WRONLY) < 0)
return AVERROR_IO;
} else {
pb = pb2;
}
ptr = info->pict.data[i];
for(j=0;j<height;j++) {
put_buffer(pb, ptr, width);
ptr += info->pict.linesize[i];
}
put_flush_packet(pb);
if (i >= 1) {
url_fclose(pb);
}
}
return 0;
}
static int yuv_probe(AVProbeData *pd)
{
if (match_ext(pd->filename, "Y"))
return AVPROBE_SCORE_MAX;
else
return 0;
}
AVImageFormat yuv_image_format = {
"yuv",
"Y",
yuv_probe,
yuv_read,
(1 << PIX_FMT_YUV420P),
yuv_write,
};
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