ffmpeg / libavcodec / wavpack.c @ 9106a698
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/*
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* WavPack lossless audio decoder
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* Copyright (c) 2006 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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#define ALT_BITSTREAM_READER_LE
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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "unary.h" |
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|
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/**
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* @file libavcodec/wavpack.c
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* WavPack lossless audio decoder
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*/
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|
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#define WV_MONO 0x00000004 |
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#define WV_JOINT_STEREO 0x00000010 |
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#define WV_FALSE_STEREO 0x40000000 |
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|
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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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|
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enum WP_ID_Flags{
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WP_IDF_MASK = 0x1F,
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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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|
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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_FLT, |
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WP_ID_CHANINFO |
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}; |
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|
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#define MAX_TERMS 16 |
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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[8]; |
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int samplesB[8]; |
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} Decorr; |
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|
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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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int bitrate_acc, bitrate_delta;
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} WvChannel; |
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|
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typedef struct WavpackContext { |
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AVCodecContext *avctx; |
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int frame_flags;
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int stereo, stereo_in;
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int joint;
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uint32_t CRC; |
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GetBitContext gb; |
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int data_size; // in bits |
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int samples;
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int terms;
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Decorr decorr[MAX_TERMS]; |
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int zero, one, zeroes;
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int and, or, shift;
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int hybrid, hybrid_bitrate;
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WvChannel ch[2];
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} WavpackContext; |
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|
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// exponent table copied from WavPack source
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static const uint8_t wp_exp2_table [256] = { |
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0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b, |
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0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16, |
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0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23, |
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0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, |
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0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d, |
| 105 |
0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b, |
| 106 |
0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, |
| 107 |
0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
| 108 |
0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
| 109 |
0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a, |
| 110 |
0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, |
| 111 |
0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, |
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0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, |
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0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4, |
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0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9, |
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0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff |
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}; |
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|
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static const uint8_t wp_log2_table [] = { |
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0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15, |
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0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a, |
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0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e, |
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0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51, |
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0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, |
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0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75, |
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0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, |
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0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, |
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0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, |
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0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2, |
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0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, |
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0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce, |
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0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb, |
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0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7, |
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0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4, |
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0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff |
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}; |
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|
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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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|
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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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|
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res = wp_exp2_table[val & 0xFF] | 0x100; |
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val >>= 8;
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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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|
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static av_always_inline int wp_log2(int32_t val) |
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{
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int bits;
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|
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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) + wp_log2_table[(val << (9 - bits)) & 0xFF]; |
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else
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return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF]; |
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} |
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|
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#define LEVEL_DECAY(a) ((a + 0x80) >> 8) |
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|
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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] -= ((c->median[n] + (128>>n) - 2) / (128>>n)) * 2 |
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#define INC_MED(n) c->median[n] += ((c->median[n] + (128>>n)) / (128>>n)) * 5 |
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|
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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) weight = -1024; \ |
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}else{ \
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weight += delta; \ |
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if(weight > 1024) weight = 1024; \ |
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} \ |
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} |
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|
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static av_always_inline int get_tail(GetBitContext *gb, int k) |
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{
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int p, e, res;
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|
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if(k<1)return 0; |
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p = av_log2(k); |
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e = (1 << (p + 1)) - k - 1; |
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res = p ? get_bits(gb, p) : 0;
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if(res >= e){
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res = (res<<1) - e + get_bits1(gb);
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} |
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return res;
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} |
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|
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static void update_error_limit(WavpackContext *ctx) |
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{
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int i, br[2], sl[2]; |
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|
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for(i = 0; i <= ctx->stereo_in; i++){ |
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ctx->ch[i].bitrate_acc += ctx->ch[i].bitrate_delta; |
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br[i] = ctx->ch[i].bitrate_acc >> 16;
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sl[i] = LEVEL_DECAY(ctx->ch[i].slow_level); |
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} |
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if(ctx->stereo_in && ctx->hybrid_bitrate){
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int balance = (sl[1] - sl[0] + br[1] + 1) >> 1; |
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if(balance > br[0]){ |
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br[1] = br[0] << 1; |
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br[0] = 0; |
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}else if(-balance > br[0]){ |
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br[0] <<= 1; |
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br[1] = 0; |
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}else{
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br[1] = br[0] + balance; |
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br[0] = br[0] - balance; |
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} |
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} |
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for(i = 0; i <= ctx->stereo_in; i++){ |
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if(ctx->hybrid_bitrate){
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if(sl[i] - br[i] > -0x100) |
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ctx->ch[i].error_limit = wp_exp2(sl[i] - br[i] + 0x100);
|
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else
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ctx->ch[i].error_limit = 0;
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}else{
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ctx->ch[i].error_limit = wp_exp2(br[i]); |
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} |
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} |
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} |
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|
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static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int channel, int *last) |
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{
|
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int t, t2;
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int sign, base, add, ret;
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WvChannel *c = &ctx->ch[channel]; |
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|
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*last = 0;
|
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|
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if((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) && !ctx->zero && !ctx->one){ |
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if(ctx->zeroes){
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ctx->zeroes--; |
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if(ctx->zeroes){
|
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c->slow_level -= LEVEL_DECAY(c->slow_level); |
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return 0; |
| 250 |
} |
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}else{
|
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t = get_unary_0_33(gb); |
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if(t >= 2) t = get_bits(gb, t - 1) | (1 << (t-1)); |
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ctx->zeroes = t; |
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if(ctx->zeroes){
|
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memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median)); |
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memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median)); |
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c->slow_level -= LEVEL_DECAY(c->slow_level); |
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return 0; |
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} |
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} |
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} |
| 263 |
|
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if(get_bits_count(gb) >= ctx->data_size){
|
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*last = 1;
|
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return 0; |
| 267 |
} |
| 268 |
|
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if(ctx->zero){
|
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t = 0;
|
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ctx->zero = 0;
|
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}else{
|
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t = get_unary_0_33(gb); |
| 274 |
if(get_bits_count(gb) >= ctx->data_size){
|
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*last = 1;
|
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return 0; |
| 277 |
} |
| 278 |
if(t == 16) { |
| 279 |
t2 = get_unary_0_33(gb); |
| 280 |
if(t2 < 2) t += t2; |
| 281 |
else t += get_bits(gb, t2 - 1) | (1 << (t2 - 1)); |
| 282 |
} |
| 283 |
|
| 284 |
if(ctx->one){
|
| 285 |
ctx->one = t&1;
|
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t = (t>>1) + 1; |
| 287 |
}else{
|
| 288 |
ctx->one = t&1;
|
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t >>= 1;
|
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} |
| 291 |
ctx->zero = !ctx->one; |
| 292 |
} |
| 293 |
|
| 294 |
if(ctx->hybrid && !channel)
|
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update_error_limit(ctx); |
| 296 |
|
| 297 |
if(!t){
|
| 298 |
base = 0;
|
| 299 |
add = GET_MED(0) - 1; |
| 300 |
DEC_MED(0);
|
| 301 |
}else if(t == 1){ |
| 302 |
base = GET_MED(0);
|
| 303 |
add = GET_MED(1) - 1; |
| 304 |
INC_MED(0);
|
| 305 |
DEC_MED(1);
|
| 306 |
}else if(t == 2){ |
| 307 |
base = GET_MED(0) + GET_MED(1); |
| 308 |
add = GET_MED(2) - 1; |
| 309 |
INC_MED(0);
|
| 310 |
INC_MED(1);
|
| 311 |
DEC_MED(2);
|
| 312 |
}else{
|
| 313 |
base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2); |
| 314 |
add = GET_MED(2) - 1; |
| 315 |
INC_MED(0);
|
| 316 |
INC_MED(1);
|
| 317 |
INC_MED(2);
|
| 318 |
} |
| 319 |
if(!c->error_limit){
|
| 320 |
ret = base + get_tail(gb, add); |
| 321 |
}else{
|
| 322 |
int mid = (base*2 + add + 1) >> 1; |
| 323 |
while(add > c->error_limit){
|
| 324 |
if(get_bits1(gb)){
|
| 325 |
add -= (mid - base); |
| 326 |
base = mid; |
| 327 |
}else
|
| 328 |
add = mid - base - 1;
|
| 329 |
mid = (base*2 + add + 1) >> 1; |
| 330 |
} |
| 331 |
ret = mid; |
| 332 |
} |
| 333 |
sign = get_bits1(gb); |
| 334 |
if(ctx->hybrid_bitrate)
|
| 335 |
c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level); |
| 336 |
return sign ? ~ret : ret;
|
| 337 |
} |
| 338 |
|
| 339 |
static int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, int16_t *dst) |
| 340 |
{
|
| 341 |
int i, j, count = 0; |
| 342 |
int last, t;
|
| 343 |
int A, B, L, L2, R, R2, bit;
|
| 344 |
int pos = 0; |
| 345 |
uint32_t crc = 0xFFFFFFFF;
|
| 346 |
|
| 347 |
s->one = s->zero = s->zeroes = 0;
|
| 348 |
do{
|
| 349 |
L = wv_get_value(s, gb, 0, &last);
|
| 350 |
if(last) break; |
| 351 |
R = wv_get_value(s, gb, 1, &last);
|
| 352 |
if(last) break; |
| 353 |
for(i = 0; i < s->terms; i++){ |
| 354 |
t = s->decorr[i].value; |
| 355 |
j = 0;
|
| 356 |
if(t > 0){ |
| 357 |
if(t > 8){ |
| 358 |
if(t & 1){ |
| 359 |
A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]; |
| 360 |
B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]; |
| 361 |
}else{
|
| 362 |
A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1; |
| 363 |
B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1; |
| 364 |
} |
| 365 |
s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0]; |
| 366 |
s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0]; |
| 367 |
j = 0;
|
| 368 |
}else{
|
| 369 |
A = s->decorr[i].samplesA[pos]; |
| 370 |
B = s->decorr[i].samplesB[pos]; |
| 371 |
j = (pos + t) & 7;
|
| 372 |
} |
| 373 |
L2 = L + ((s->decorr[i].weightA * A + 512) >> 10); |
| 374 |
R2 = R + ((s->decorr[i].weightB * B + 512) >> 10); |
| 375 |
if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta; |
| 376 |
if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta; |
| 377 |
s->decorr[i].samplesA[j] = L = L2; |
| 378 |
s->decorr[i].samplesB[j] = R = R2; |
| 379 |
}else if(t == -1){ |
| 380 |
L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10); |
| 381 |
UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
|
| 382 |
L = L2; |
| 383 |
R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10); |
| 384 |
UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R); |
| 385 |
R = R2; |
| 386 |
s->decorr[i].samplesA[0] = R;
|
| 387 |
}else{
|
| 388 |
R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10); |
| 389 |
UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
|
| 390 |
R = R2; |
| 391 |
|
| 392 |
if(t == -3){ |
| 393 |
R2 = s->decorr[i].samplesA[0];
|
| 394 |
s->decorr[i].samplesA[0] = R;
|
| 395 |
} |
| 396 |
|
| 397 |
L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10); |
| 398 |
UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L); |
| 399 |
L = L2; |
| 400 |
s->decorr[i].samplesB[0] = L;
|
| 401 |
} |
| 402 |
} |
| 403 |
pos = (pos + 1) & 7; |
| 404 |
if(s->joint)
|
| 405 |
L += (R -= (L >> 1));
|
| 406 |
crc = (crc * 3 + L) * 3 + R; |
| 407 |
bit = (L & s->and) | s->or; |
| 408 |
*dst++ = ((L + bit) << s->shift) - bit; |
| 409 |
bit = (R & s->and) | s->or; |
| 410 |
*dst++ = ((R + bit) << s->shift) - bit; |
| 411 |
count++; |
| 412 |
}while(!last && count < s->samples);
|
| 413 |
|
| 414 |
if(crc != s->CRC){
|
| 415 |
av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
|
| 416 |
return -1; |
| 417 |
} |
| 418 |
return count * 2; |
| 419 |
} |
| 420 |
|
| 421 |
static int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, int16_t *dst) |
| 422 |
{
|
| 423 |
int i, j, count = 0; |
| 424 |
int last, t;
|
| 425 |
int A, S, T, bit;
|
| 426 |
int pos = 0; |
| 427 |
uint32_t crc = 0xFFFFFFFF;
|
| 428 |
|
| 429 |
s->one = s->zero = s->zeroes = 0;
|
| 430 |
do{
|
| 431 |
T = wv_get_value(s, gb, 0, &last);
|
| 432 |
S = 0;
|
| 433 |
if(last) break; |
| 434 |
for(i = 0; i < s->terms; i++){ |
| 435 |
t = s->decorr[i].value; |
| 436 |
if(t > 8){ |
| 437 |
if(t & 1) |
| 438 |
A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]; |
| 439 |
else
|
| 440 |
A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1; |
| 441 |
s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0]; |
| 442 |
j = 0;
|
| 443 |
}else{
|
| 444 |
A = s->decorr[i].samplesA[pos]; |
| 445 |
j = (pos + t) & 7;
|
| 446 |
} |
| 447 |
S = T + ((s->decorr[i].weightA * A + 512) >> 10); |
| 448 |
if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta; |
| 449 |
s->decorr[i].samplesA[j] = T = S; |
| 450 |
} |
| 451 |
pos = (pos + 1) & 7; |
| 452 |
crc = crc * 3 + S;
|
| 453 |
bit = (S & s->and) | s->or; |
| 454 |
*dst++ = ((S + bit) << s->shift) - bit; |
| 455 |
count++; |
| 456 |
}while(!last && count < s->samples);
|
| 457 |
|
| 458 |
if(crc != s->CRC){
|
| 459 |
av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
|
| 460 |
return -1; |
| 461 |
} |
| 462 |
return count;
|
| 463 |
} |
| 464 |
|
| 465 |
static av_cold int wavpack_decode_init(AVCodecContext *avctx) |
| 466 |
{
|
| 467 |
WavpackContext *s = avctx->priv_data; |
| 468 |
|
| 469 |
s->avctx = avctx; |
| 470 |
s->stereo = (avctx->channels == 2);
|
| 471 |
avctx->sample_fmt = SAMPLE_FMT_S16; |
| 472 |
avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
|
| 473 |
|
| 474 |
return 0; |
| 475 |
} |
| 476 |
|
| 477 |
static int wavpack_decode_frame(AVCodecContext *avctx, |
| 478 |
void *data, int *data_size, |
| 479 |
AVPacket *avpkt) |
| 480 |
{
|
| 481 |
const uint8_t *buf = avpkt->data;
|
| 482 |
int buf_size = avpkt->size;
|
| 483 |
WavpackContext *s = avctx->priv_data; |
| 484 |
int16_t *samples = data; |
| 485 |
int samplecount;
|
| 486 |
int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0; |
| 487 |
int got_hybrid = 0; |
| 488 |
const uint8_t* buf_end = buf + buf_size;
|
| 489 |
int i, j, id, size, ssize, weights, t;
|
| 490 |
|
| 491 |
if (buf_size == 0){ |
| 492 |
*data_size = 0;
|
| 493 |
return 0; |
| 494 |
} |
| 495 |
|
| 496 |
memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr)); |
| 497 |
memset(s->ch, 0, sizeof(s->ch)); |
| 498 |
s->and = s->or = s->shift = 0;
|
| 499 |
|
| 500 |
s->samples = AV_RL32(buf); buf += 4;
|
| 501 |
if(!s->samples){
|
| 502 |
*data_size = 0;
|
| 503 |
return buf_size;
|
| 504 |
} |
| 505 |
/* should not happen but who knows */
|
| 506 |
if(s->samples * 2 * avctx->channels > *data_size){ |
| 507 |
av_log(avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc!\n");
|
| 508 |
return -1; |
| 509 |
} |
| 510 |
s->frame_flags = AV_RL32(buf); buf += 4;
|
| 511 |
s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
|
| 512 |
s->joint = s->frame_flags & WV_JOINT_STEREO; |
| 513 |
s->hybrid = s->frame_flags & WV_HYBRID_MODE; |
| 514 |
s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE; |
| 515 |
s->CRC = AV_RL32(buf); buf += 4;
|
| 516 |
// parse metadata blocks
|
| 517 |
while(buf < buf_end){
|
| 518 |
id = *buf++; |
| 519 |
size = *buf++; |
| 520 |
if(id & WP_IDF_LONG) {
|
| 521 |
size |= (*buf++) << 8;
|
| 522 |
size |= (*buf++) << 16;
|
| 523 |
} |
| 524 |
size <<= 1; // size is specified in words |
| 525 |
ssize = size; |
| 526 |
if(id & WP_IDF_ODD) size--;
|
| 527 |
if(size < 0){ |
| 528 |
av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);
|
| 529 |
break;
|
| 530 |
} |
| 531 |
if(buf + ssize > buf_end){
|
| 532 |
av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);
|
| 533 |
break;
|
| 534 |
} |
| 535 |
if(id & WP_IDF_IGNORE){
|
| 536 |
buf += ssize; |
| 537 |
continue;
|
| 538 |
} |
| 539 |
switch(id & WP_IDF_MASK){
|
| 540 |
case WP_ID_DECTERMS:
|
| 541 |
s->terms = size; |
| 542 |
if(s->terms > MAX_TERMS){
|
| 543 |
av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
|
| 544 |
buf += ssize; |
| 545 |
continue;
|
| 546 |
} |
| 547 |
for(i = 0; i < s->terms; i++) { |
| 548 |
s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5; |
| 549 |
s->decorr[s->terms - i - 1].delta = *buf >> 5; |
| 550 |
buf++; |
| 551 |
} |
| 552 |
got_terms = 1;
|
| 553 |
break;
|
| 554 |
case WP_ID_DECWEIGHTS:
|
| 555 |
if(!got_terms){
|
| 556 |
av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
|
| 557 |
continue;
|
| 558 |
} |
| 559 |
weights = size >> s->stereo_in; |
| 560 |
if(weights > MAX_TERMS || weights > s->terms){
|
| 561 |
av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
|
| 562 |
buf += ssize; |
| 563 |
continue;
|
| 564 |
} |
| 565 |
for(i = 0; i < weights; i++) { |
| 566 |
t = (int8_t)(*buf++); |
| 567 |
s->decorr[s->terms - i - 1].weightA = t << 3; |
| 568 |
if(s->decorr[s->terms - i - 1].weightA > 0) |
| 569 |
s->decorr[s->terms - i - 1].weightA += (s->decorr[s->terms - i - 1].weightA + 64) >> 7; |
| 570 |
if(s->stereo_in){
|
| 571 |
t = (int8_t)(*buf++); |
| 572 |
s->decorr[s->terms - i - 1].weightB = t << 3; |
| 573 |
if(s->decorr[s->terms - i - 1].weightB > 0) |
| 574 |
s->decorr[s->terms - i - 1].weightB += (s->decorr[s->terms - i - 1].weightB + 64) >> 7; |
| 575 |
} |
| 576 |
} |
| 577 |
got_weights = 1;
|
| 578 |
break;
|
| 579 |
case WP_ID_DECSAMPLES:
|
| 580 |
if(!got_terms){
|
| 581 |
av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
|
| 582 |
continue;
|
| 583 |
} |
| 584 |
t = 0;
|
| 585 |
for(i = s->terms - 1; (i >= 0) && (t < size); i--) { |
| 586 |
if(s->decorr[i].value > 8){ |
| 587 |
s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2; |
| 588 |
s->decorr[i].samplesA[1] = wp_exp2(AV_RL16(buf)); buf += 2; |
| 589 |
if(s->stereo_in){
|
| 590 |
s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2; |
| 591 |
s->decorr[i].samplesB[1] = wp_exp2(AV_RL16(buf)); buf += 2; |
| 592 |
t += 4;
|
| 593 |
} |
| 594 |
t += 4;
|
| 595 |
}else if(s->decorr[i].value < 0){ |
| 596 |
s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2; |
| 597 |
s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2; |
| 598 |
t += 4;
|
| 599 |
}else{
|
| 600 |
for(j = 0; j < s->decorr[i].value; j++){ |
| 601 |
s->decorr[i].samplesA[j] = wp_exp2(AV_RL16(buf)); buf += 2;
|
| 602 |
if(s->stereo_in){
|
| 603 |
s->decorr[i].samplesB[j] = wp_exp2(AV_RL16(buf)); buf += 2;
|
| 604 |
} |
| 605 |
} |
| 606 |
t += s->decorr[i].value * 2 * (s->stereo_in + 1); |
| 607 |
} |
| 608 |
} |
| 609 |
got_samples = 1;
|
| 610 |
break;
|
| 611 |
case WP_ID_ENTROPY:
|
| 612 |
if(size != 6 * (s->stereo_in + 1)){ |
| 613 |
av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, got %i", 6 * (s->stereo_in + 1), size); |
| 614 |
buf += ssize; |
| 615 |
continue;
|
| 616 |
} |
| 617 |
for(j = 0; j <= s->stereo_in; j++){ |
| 618 |
for(i = 0; i < 3; i++){ |
| 619 |
s->ch[j].median[i] = wp_exp2(AV_RL16(buf)); |
| 620 |
buf += 2;
|
| 621 |
} |
| 622 |
} |
| 623 |
got_entropy = 1;
|
| 624 |
break;
|
| 625 |
case WP_ID_HYBRID:
|
| 626 |
if(s->hybrid_bitrate){
|
| 627 |
for(i = 0; i <= s->stereo_in; i++){ |
| 628 |
s->ch[i].slow_level = wp_exp2(AV_RL16(buf)); |
| 629 |
buf += 2;
|
| 630 |
size -= 2;
|
| 631 |
} |
| 632 |
} |
| 633 |
for(i = 0; i < (s->stereo_in + 1); i++){ |
| 634 |
s->ch[i].bitrate_acc = AV_RL16(buf) << 16;
|
| 635 |
buf += 2;
|
| 636 |
size -= 2;
|
| 637 |
} |
| 638 |
if(size > 0){ |
| 639 |
for(i = 0; i < (s->stereo_in + 1); i++){ |
| 640 |
s->ch[i].bitrate_delta = wp_exp2((int16_t)AV_RL16(buf)); |
| 641 |
buf += 2;
|
| 642 |
} |
| 643 |
}else{
|
| 644 |
for(i = 0; i < (s->stereo_in + 1); i++) |
| 645 |
s->ch[i].bitrate_delta = 0;
|
| 646 |
} |
| 647 |
got_hybrid = 1;
|
| 648 |
break;
|
| 649 |
case WP_ID_INT32INFO:
|
| 650 |
if(size != 4 || *buf){ |
| 651 |
av_log(avctx, AV_LOG_ERROR, "Invalid INT32INFO, size = %i, sent_bits = %i\n", size, *buf);
|
| 652 |
buf += ssize; |
| 653 |
continue;
|
| 654 |
} |
| 655 |
if(buf[1]) |
| 656 |
s->shift = buf[1];
|
| 657 |
else if(buf[2]){ |
| 658 |
s->and = s->or = 1;
|
| 659 |
s->shift = buf[2];
|
| 660 |
}else if(buf[3]){ |
| 661 |
s->and = 1;
|
| 662 |
s->shift = buf[3];
|
| 663 |
} |
| 664 |
buf += 4;
|
| 665 |
break;
|
| 666 |
case WP_ID_DATA:
|
| 667 |
init_get_bits(&s->gb, buf, size * 8);
|
| 668 |
s->data_size = size * 8;
|
| 669 |
buf += size; |
| 670 |
got_bs = 1;
|
| 671 |
break;
|
| 672 |
default:
|
| 673 |
buf += size; |
| 674 |
} |
| 675 |
if(id & WP_IDF_ODD) buf++;
|
| 676 |
} |
| 677 |
if(!got_terms){
|
| 678 |
av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
|
| 679 |
return -1; |
| 680 |
} |
| 681 |
if(!got_weights){
|
| 682 |
av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
|
| 683 |
return -1; |
| 684 |
} |
| 685 |
if(!got_samples){
|
| 686 |
av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
|
| 687 |
return -1; |
| 688 |
} |
| 689 |
if(!got_entropy){
|
| 690 |
av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
|
| 691 |
return -1; |
| 692 |
} |
| 693 |
if(s->hybrid && !got_hybrid){
|
| 694 |
av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
|
| 695 |
return -1; |
| 696 |
} |
| 697 |
if(!got_bs){
|
| 698 |
av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
|
| 699 |
return -1; |
| 700 |
} |
| 701 |
|
| 702 |
if(s->stereo_in)
|
| 703 |
samplecount = wv_unpack_stereo(s, &s->gb, samples); |
| 704 |
else{
|
| 705 |
samplecount = wv_unpack_mono(s, &s->gb, samples); |
| 706 |
if(s->stereo){
|
| 707 |
int16_t *dst = samples + samplecount * 2;
|
| 708 |
int16_t *src = samples + samplecount; |
| 709 |
int cnt = samplecount;
|
| 710 |
while(cnt--){
|
| 711 |
*--dst = *--src; |
| 712 |
*--dst = *src; |
| 713 |
} |
| 714 |
samplecount *= 2;
|
| 715 |
} |
| 716 |
} |
| 717 |
*data_size = samplecount * 2;
|
| 718 |
|
| 719 |
return buf_size;
|
| 720 |
} |
| 721 |
|
| 722 |
AVCodec wavpack_decoder = {
|
| 723 |
"wavpack",
|
| 724 |
CODEC_TYPE_AUDIO, |
| 725 |
CODEC_ID_WAVPACK, |
| 726 |
sizeof(WavpackContext),
|
| 727 |
wavpack_decode_init, |
| 728 |
NULL,
|
| 729 |
NULL,
|
| 730 |
wavpack_decode_frame, |
| 731 |
.long_name = NULL_IF_CONFIG_SMALL("WavPack"),
|
| 732 |
}; |