diff options
Diffstat (limited to 'libavcodec/proresdsp.c')
-rw-r--r-- | libavcodec/proresdsp.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libavcodec/proresdsp.c b/libavcodec/proresdsp.c new file mode 100644 index 0000000..7e753e9 --- /dev/null +++ b/libavcodec/proresdsp.c @@ -0,0 +1,63 @@ +/* + * 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) +{ + dsp->idct_put = prores_idct_put_c; + dsp->idct_permutation_type = FF_NO_IDCT_PERM; + + if (HAVE_MMX) ff_proresdsp_x86_init(dsp); + + ff_init_scantable_permutation(dsp->idct_permutation, + dsp->idct_permutation_type); +} |