| 1 | /* |
| 2 | * Apple ProRes compatible decoder |
| 3 | * |
| 4 | * Copyright (c) 2010-2011 Maxim Poliakovski |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include "config.h" |
| 24 | #include "libavutil/attributes.h" |
| 25 | #include "libavutil/common.h" |
| 26 | #include "idctdsp.h" |
| 27 | #include "proresdsp.h" |
| 28 | #include "simple_idct.h" |
| 29 | |
| 30 | #define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones |
| 31 | #define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels |
| 32 | #define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels |
| 33 | |
| 34 | #define CLIP(x) (av_clip((x), CLIP_MIN, CLIP_MAX)) |
| 35 | |
| 36 | /** |
| 37 | * Add bias value, clamp and output pixels of a slice |
| 38 | */ |
| 39 | static void put_pixels(uint16_t *dst, int stride, const int16_t *in) |
| 40 | { |
| 41 | int x, y, src_offset, dst_offset; |
| 42 | |
| 43 | for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) { |
| 44 | for (x = 0; x < 8; x++) { |
| 45 | src_offset = (y << 3) + x; |
| 46 | |
| 47 | dst[dst_offset + x] = CLIP(in[src_offset]); |
| 48 | } |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | static void prores_idct_put_c(uint16_t *out, int linesize, int16_t *block, const int16_t *qmat) |
| 53 | { |
| 54 | ff_prores_idct(block, qmat); |
| 55 | put_pixels(out, linesize >> 1, block); |
| 56 | } |
| 57 | |
| 58 | av_cold void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx) |
| 59 | { |
| 60 | dsp->idct_put = prores_idct_put_c; |
| 61 | dsp->idct_permutation_type = FF_IDCT_PERM_NONE; |
| 62 | |
| 63 | if (ARCH_X86) |
| 64 | ff_proresdsp_init_x86(dsp, avctx); |
| 65 | |
| 66 | ff_init_scantable_permutation(dsp->idct_permutation, |
| 67 | dsp->idct_permutation_type); |
| 68 | } |