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Diffstat (limited to 'libavcodec/wavpack.h')
| -rw-r--r-- | libavcodec/wavpack.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/libavcodec/wavpack.h b/libavcodec/wavpack.h new file mode 100644 index 0000000000..3a3e8dbd2e --- /dev/null +++ b/libavcodec/wavpack.h @@ -0,0 +1,194 @@ +/* + * 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 "libavutil/common.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_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 131072 + +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_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; + int 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] -= ((c->median[n] + (128 >> (n)) - 2) / (128 >> (n))) * 2 +#define INC_MED(n) c->median[n] += ((c->median[n] + (128 >> (n)) ) / (128 >> (n))) * 5 + +// 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 +static const uint8_t wp_exp2_table[256] = { + 0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b, + 0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16, + 0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23, + 0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d, + 0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b, + 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, + 0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, + 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, + 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a, + 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, + 0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, + 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, + 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4, + 0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9, + 0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff +}; + +static const uint8_t wp_log2_table [] = { + 0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15, + 0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a, + 0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e, + 0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51, + 0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, + 0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75, + 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, + 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, + 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, + 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2, + 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, + 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce, + 0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb, + 0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7, + 0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4, + 0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff +}; + +static av_always_inline int wp_exp2(int16_t val) +{ + int res, neg = 0; + + if (val < 0) { + val = -val; + neg = 1; + } + + res = wp_exp2_table[val & 0xFF] | 0x100; + val >>= 8; + res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val)); + return neg ? -res : res; +} + +static av_always_inline int wp_log2(int32_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) + wp_log2_table[(val << (9 - bits)) & 0xFF]; + else + return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF]; +} + +#endif /* AVCODEC_WAVPACK_H */ |