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/*
* uyvy.c
* Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 2003 Regis Duchesne <hpreg@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
* See http://libmpeg2.sourceforge.net/ for updates.
*
* mpeg2dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpeg2dec 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "k9common.h"
#include "mpeg2.h"
#include "mpeg2convert.h"
typedef struct {
int width;
int stride;
int chroma420;
uint8_t * out;
} convert_uyvy_t;
static void uyvy_start (void * _id, const mpeg2_fbuf_t * fbuf,
const mpeg2_picture_t * picture,
const mpeg2_gop_t * gop)
{
convert_uyvy_t * instance = (convert_uyvy_t *) _id;
instance->out = fbuf->buf[0];
instance->stride = instance->width;
if (picture->nb_fields == 1) {
if (! (picture->flags & PIC_FLAG_TOP_FIELD_FIRST))
instance->out += 2 * instance->stride;
instance->stride <<= 1;
}
}
#ifdef WORDS_BIGENDIAN
#define PACK(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
#else
#define PACK(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
#endif
static void uyvy_line (uint8_t * py, uint8_t * pu, uint8_t * pv, void * _dst,
int width)
{
uint32_t * dst = (uint32_t *) _dst;
width >>= 4;
do {
dst[0] = PACK (pu[0], py[0], pv[0], py[1]);
dst[1] = PACK (pu[1], py[2], pv[1], py[3]);
dst[2] = PACK (pu[2], py[4], pv[2], py[5]);
dst[3] = PACK (pu[3], py[6], pv[3], py[7]);
dst[4] = PACK (pu[4], py[8], pv[4], py[9]);
dst[5] = PACK (pu[5], py[10], pv[5], py[11]);
dst[6] = PACK (pu[6], py[12], pv[6], py[13]);
dst[7] = PACK (pu[7], py[14], pv[7], py[15]);
py += 16;
pu += 8;
pv += 8;
dst += 8;
} while (--width);
}
static void uyvy_copy (void * id, uint8_t * const * src, unsigned int v_offset)
{
const convert_uyvy_t * instance = (convert_uyvy_t *) id;
uint8_t * py;
uint8_t * pu;
uint8_t * pv;
uint8_t * dst;
int height;
dst = instance->out + 2 * instance->stride * v_offset;
py = src[0]; pu = src[1]; pv = src[2];
height = 16;
do {
uyvy_line (py, pu, pv, dst, instance->width);
dst += 2 * instance->stride;
py += instance->stride;
if (! (--height & instance->chroma420)) {
pu += instance->stride >> 1;
pv += instance->stride >> 1;
}
} while (height);
}
int mpeg2convert_uyvy (int stage, void * _id, const mpeg2_sequence_t * seq,
int stride, uint32_t accel, void * arg,
mpeg2_convert_init_t * result)
{
convert_uyvy_t * instance = (convert_uyvy_t *) _id;
if (seq->chroma_width == seq->width)
return 1;
if (instance) {
instance->width = seq->width;
instance->chroma420 = (seq->chroma_height < seq->height);
result->buf_size[0] = seq->width * seq->height * 2;
result->buf_size[1] = result->buf_size[2] = 0;
result->start = uyvy_start;
result->copy = uyvy_copy;
} else {
result->id_size = sizeof (convert_uyvy_t);
}
return 0;
}
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