mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-25 00:32:31 +00:00
64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/*
|
|
* Apple ProRes compatible decoder
|
|
*
|
|
* Copyright (c) 2010-2011 Maxim Poliakovski
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "proresdsp.h"
|
|
#include "simple_idct.h"
|
|
|
|
#define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones
|
|
#define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels
|
|
#define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
|
|
|
|
#define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
|
|
|
|
/**
|
|
* Add bias value, clamp and output pixels of a slice
|
|
*/
|
|
static void put_pixels(uint16_t *dst, int stride, const DCTELEM *in)
|
|
{
|
|
int x, y, src_offset, dst_offset;
|
|
|
|
for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) {
|
|
for (x = 0; x < 8; x++) {
|
|
src_offset = (y << 3) + x;
|
|
|
|
dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void prores_idct_put_c(uint16_t *out, int linesize, DCTELEM *block, const int16_t *qmat)
|
|
{
|
|
ff_prores_idct(block, qmat);
|
|
put_pixels(out, linesize >> 1, block);
|
|
}
|
|
|
|
void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
|
|
{
|
|
dsp->idct_put = prores_idct_put_c;
|
|
dsp->idct_permutation_type = FF_NO_IDCT_PERM;
|
|
|
|
if (HAVE_MMX) ff_proresdsp_x86_init(dsp, avctx);
|
|
|
|
ff_init_scantable_permutation(dsp->idct_permutation,
|
|
dsp->idct_permutation_type);
|
|
}
|