mirror of https://git.ffmpeg.org/ffmpeg.git
164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/*
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* WavPack decoder/encoder common code
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* Copyright (c) 2006,2011 Konstantin Shishkov
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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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#ifndef AVCODEC_WAVPACK_H
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#define AVCODEC_WAVPACK_H
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#include "libavutil/common.h"
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#define MAX_TERMS 16
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#define MAX_TERM 8
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#define WV_HEADER_SIZE 32
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#define WV_MONO 0x00000004
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#define WV_JOINT_STEREO 0x00000010
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#define WV_CROSS_DECORR 0x00000020
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#define WV_FLOAT_DATA 0x00000080
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#define WV_INT32_DATA 0x00000100
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#define WV_FALSE_STEREO 0x40000000
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#define WV_DSD_DATA 0x80000000
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#define WV_HYBRID_MODE 0x00000008
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#define WV_HYBRID_SHAPE 0x00000008
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#define WV_HYBRID_BITRATE 0x00000200
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#define WV_HYBRID_BALANCE 0x00000400
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#define WV_INITIAL_BLOCK 0x00000800
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#define WV_FINAL_BLOCK 0x00001000
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#define WV_MONO_DATA (WV_MONO | WV_FALSE_STEREO)
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#define WV_SINGLE_BLOCK (WV_INITIAL_BLOCK | WV_FINAL_BLOCK)
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#define WV_FLT_SHIFT_ONES 0x01
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#define WV_FLT_SHIFT_SAME 0x02
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#define WV_FLT_SHIFT_SENT 0x04
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#define WV_FLT_ZERO_SENT 0x08
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#define WV_FLT_ZERO_SIGN 0x10
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#define WV_MAX_SAMPLES 150000
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enum WP_ID_Flags {
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WP_IDF_MASK = 0x3F,
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WP_IDF_IGNORE = 0x20,
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WP_IDF_ODD = 0x40,
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WP_IDF_LONG = 0x80
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};
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enum WP_ID {
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WP_ID_DUMMY = 0,
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WP_ID_ENCINFO,
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WP_ID_DECTERMS,
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WP_ID_DECWEIGHTS,
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WP_ID_DECSAMPLES,
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WP_ID_ENTROPY,
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WP_ID_HYBRID,
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WP_ID_SHAPING,
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WP_ID_FLOATINFO,
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WP_ID_INT32INFO,
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WP_ID_DATA,
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WP_ID_CORR,
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WP_ID_EXTRABITS,
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WP_ID_CHANINFO,
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WP_ID_DSD_DATA,
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WP_ID_SAMPLE_RATE = 0x27,
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};
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typedef struct Decorr {
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int delta;
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int value;
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int weightA;
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int weightB;
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int samplesA[MAX_TERM];
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int samplesB[MAX_TERM];
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int sumA;
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int sumB;
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} Decorr;
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typedef struct WvChannel {
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int median[3];
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int slow_level, error_limit;
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unsigned bitrate_acc, bitrate_delta;
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} WvChannel;
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// macros for manipulating median values
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#define GET_MED(n) ((c->median[n] >> 4) + 1)
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#define DEC_MED(n) c->median[n] -= ((int)(c->median[n] + (128U >> (n)) - 2) / (128 >> (n))) * 2U
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#define INC_MED(n) c->median[n] += ((int)(c->median[n] + (128U >> (n)) ) / (128 >> (n))) * 5U
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// macros for applying weight
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#define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
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if ((samples) && (in)) { \
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if (((samples) ^ (in)) < 0) { \
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(weight) -= (delta); \
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if ((weight) < -1024) \
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(weight) = -1024; \
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} else { \
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(weight) += (delta); \
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if ((weight) > 1024) \
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(weight) = 1024; \
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} \
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}
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static const int wv_rates[16] = {
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6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
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32000, 44100, 48000, 64000, 88200, 96000, 192000, 0
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};
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// exponent table copied from WavPack source
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extern const uint8_t ff_wp_exp2_table[256];
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extern const uint8_t ff_wp_log2_table[256];
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static av_always_inline int wp_exp2(int16_t val)
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{
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int res, neg = 0;
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if (val < 0) {
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val = -val;
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neg = 1;
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}
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res = ff_wp_exp2_table[val & 0xFF] | 0x100;
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val >>= 8;
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if (val > 31U)
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return INT_MIN;
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res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
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return neg ? -res : res;
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}
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static av_always_inline int wp_log2(uint32_t val)
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{
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int bits;
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if (!val)
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return 0;
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if (val == 1)
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return 256;
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val += val >> 9;
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bits = av_log2(val) + 1;
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if (bits < 9)
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return (bits << 8) + ff_wp_log2_table[(val << (9 - bits)) & 0xFF];
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else
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return (bits << 8) + ff_wp_log2_table[(val >> (bits - 9)) & 0xFF];
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}
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#endif /* AVCODEC_WAVPACK_H */
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