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746ab8327c
The ASUS V2 format is designed for a little-endian bitstream reader, yet our encoder used an ordinary big-endian bitstream writer to write it; the bits of every byte were swapped at the end and some data (namely the numbers not in static tables) had to be bitreversed before writing it at all, so that it would be reversed twice. This commit stops doing so; instead, a little-endian bitstream writer is used. This also necessitated to switch certain static tables, which required trivial modifications to the decoder (that uses the same tables). Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/*
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* Copyright (c) 2003 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* ASUS V1/V2 encoder/decoder common data.
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*/
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#ifndef AVCODEC_ASV_H
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#define AVCODEC_ASV_H
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#include <stdint.h>
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#include "blockdsp.h"
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#include "bswapdsp.h"
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#include "fdctdsp.h"
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#include "idctdsp.h"
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#include "get_bits.h"
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#include "pixblockdsp.h"
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#include "put_bits.h"
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typedef struct ASV1Context {
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AVCodecContext *avctx;
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BlockDSPContext bdsp;
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BswapDSPContext bbdsp;
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FDCTDSPContext fdsp;
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IDCTDSPContext idsp;
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PixblockDSPContext pdsp;
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PutBitContext pb;
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GetBitContext gb;
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ScanTable scantable;
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int inv_qscale;
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int mb_width;
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int mb_height;
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int mb_width2;
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int mb_height2;
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DECLARE_ALIGNED(32, int16_t, block)[6][64];
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uint16_t intra_matrix[64];
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int q_intra_matrix[64];
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uint8_t *bitstream_buffer;
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unsigned int bitstream_buffer_size;
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} ASV1Context;
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extern const uint8_t ff_asv_scantab[64];
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extern const uint8_t ff_asv_ccp_tab[17][2];
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extern const uint8_t ff_asv_level_tab[7][2];
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extern const uint8_t ff_asv_dc_ccp_tab[8][2];
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extern const uint8_t ff_asv_ac_ccp_tab[16][2];
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extern const uint16_t ff_asv2_level_tab[63][2];
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void ff_asv_common_init(AVCodecContext *avctx);
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#endif /* AVCODEC_ASV_H */
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