From 977d8b6297633d82b498433a35d0ff496b4787c6 Mon Sep 17 00:00:00 2001 From: Andreas Rheinhardt Date: Tue, 1 Feb 2022 08:00:27 +0100 Subject: avcodec/mpeg12.h: Move decoder-only stuff to a new header Signed-off-by: Andreas Rheinhardt --- libavcodec/mpeg12dec.h | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 libavcodec/mpeg12dec.h (limited to 'libavcodec/mpeg12dec.h') diff --git a/libavcodec/mpeg12dec.h b/libavcodec/mpeg12dec.h new file mode 100644 index 0000000000..b4e94a92ce --- /dev/null +++ b/libavcodec/mpeg12dec.h @@ -0,0 +1,60 @@ +/* + * MPEG-1/2 decoder header + * Copyright (c) 2007 Aurelien Jacobs + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_MPEG12DEC_H +#define AVCODEC_MPEG12DEC_H + +#include "get_bits.h" +#include "mpeg12vlc.h" +#include "rl.h" + +#define INIT_2D_VLC_RL(rl, static_size, flags)\ +{\ + static RL_VLC_ELEM rl_vlc_table[static_size];\ + rl.rl_vlc[0] = rl_vlc_table;\ + ff_init_2d_vlc_rl(&rl, static_size, flags);\ +} + +void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags); + +static inline int decode_dc(GetBitContext *gb, int component) +{ + int code, diff; + + if (component == 0) { + code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2); + } else { + code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2); + } + if (code == 0) { + diff = 0; + } else { + diff = get_xbits(gb, code); + } + return diff; +} + +int ff_mpeg1_decode_block_intra(GetBitContext *gb, + const uint16_t *quant_matrix, + const uint8_t *scantable, int last_dc[3], + int16_t *block, int index, int qscale); + +#endif /* AVCODEC_MPEG12DEC_H */ -- cgit v1.2.3