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