563 lines
18 KiB
C
563 lines
18 KiB
C
/*
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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 "bitstream.h"
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/**
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* @file wavpack.c
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* WavPack lossless audio decoder
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*/
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#define WV_JOINT 0x0010
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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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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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#define MAX_TERMS 16
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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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typedef struct WavpackContext {
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AVCodecContext *avctx;
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int stereo;
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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 median[6];
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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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} WavpackContext;
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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,
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0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
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0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
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0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
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0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
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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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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 = 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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static inline int get_unary(GetBitContext *gb){
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int r=0;
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while(get_bits1(gb) && r<33)r++;
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return r;
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}
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// macros for manipulating median values
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#define GET_MED(n) ((median[n] >> 4) + 1)
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#define DEC_MED(n) median[n] -= ((median[n] + (128>>n) - 2) / (128>>n)) * 2
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#define INC_MED(n) median[n] += ((median[n] + (128>>n)) / (128>>n)) * 5
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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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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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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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static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int *median, 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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*last = 0;
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if((ctx->median[0] < 2U) && (ctx->median[3] < 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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return 0;
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}else{
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t = get_unary(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->median, 0, sizeof(ctx->median));
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return 0;
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}
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}
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}
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if(get_bits_count(gb) >= ctx->data_size){
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*last = 1;
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return 0;
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}
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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(gb);
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if(get_bits_count(gb) >= ctx->data_size){
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*last = 1;
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return 0;
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}
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if(t == 16) {
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t2 = get_unary(gb);
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if(t2 < 2) t += t2;
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else t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
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}
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if(ctx->one){
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ctx->one = t&1;
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t = (t>>1) + 1;
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}else{
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ctx->one = t&1;
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t >>= 1;
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}
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ctx->zero = !ctx->one;
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}
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if(!t){
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base = 0;
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add = GET_MED(0) - 1;
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DEC_MED(0);
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}else if(t == 1){
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base = GET_MED(0);
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add = GET_MED(1) - 1;
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INC_MED(0);
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DEC_MED(1);
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}else if(t == 2){
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base = GET_MED(0) + GET_MED(1);
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add = GET_MED(2) - 1;
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INC_MED(0);
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INC_MED(1);
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DEC_MED(2);
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}else{
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base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
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add = GET_MED(2) - 1;
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INC_MED(0);
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INC_MED(1);
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INC_MED(2);
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}
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ret = base + get_tail(gb, add);
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sign = get_bits1(gb);
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return sign ? ~ret : ret;
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}
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static int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, int16_t *dst)
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{
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int i, j, count = 0;
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int last, t;
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int A, B, L, L2, R, R2;
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int pos = 0;
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uint32_t crc = 0xFFFFFFFF;
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s->one = s->zero = s->zeroes = 0;
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do{
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L = wv_get_value(s, gb, s->median, &last);
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if(last) break;
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R = wv_get_value(s, gb, s->median + 3, &last);
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if(last) break;
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for(i = 0; i < s->terms; i++){
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t = s->decorr[i].value;
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j = 0;
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if(t > 0){
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if(t > 8){
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if(t & 1){
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A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
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B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
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}else{
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A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
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B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
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}
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s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
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s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
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j = 0;
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}else{
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A = s->decorr[i].samplesA[pos];
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B = s->decorr[i].samplesB[pos];
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j = (pos + t) & 7;
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}
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L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
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R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
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if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
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if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
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s->decorr[i].samplesA[j] = L = L2;
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s->decorr[i].samplesB[j] = R = R2;
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}else if(t == -1){
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L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
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UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
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L = L2;
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R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
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UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
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R = R2;
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s->decorr[i].samplesA[0] = R;
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}else{
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R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
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UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
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R = R2;
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if(t == -3){
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R2 = s->decorr[i].samplesA[0];
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s->decorr[i].samplesA[0] = R;
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}
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L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
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UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
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L = L2;
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s->decorr[i].samplesB[0] = L;
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}
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}
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pos = (pos + 1) & 7;
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if(s->joint)
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L += (R -= (L >> 1));
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crc = (crc * 3 + L) * 3 + R;
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*dst++ = L;
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*dst++ = R;
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count++;
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}while(!last && count < s->samples);
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if(crc != s->CRC){
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av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
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return -1;
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}
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return count * 2;
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}
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static int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, int16_t *dst)
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{
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int i, j, count = 0;
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int last, t;
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int A, S, T;
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int pos = 0;
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uint32_t crc = 0xFFFFFFFF;
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s->one = s->zero = s->zeroes = 0;
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do{
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T = wv_get_value(s, gb, s->median, &last);
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S = 0;
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if(last) break;
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for(i = 0; i < s->terms; i++){
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t = s->decorr[i].value;
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if(t > 8){
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if(t & 1)
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A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
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else
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A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
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s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
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j = 0;
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}else{
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A = s->decorr[i].samplesA[pos];
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j = (pos + t) & 7;
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}
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S = T + ((s->decorr[i].weightA * A + 512) >> 10);
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if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
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s->decorr[i].samplesA[j] = T = S;
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}
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pos = (pos + 1) & 7;
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crc = crc * 3 + S;
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*dst++ = S;
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count++;
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}while(!last && count < s->samples);
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if(crc != s->CRC){
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av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
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return -1;
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}
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return count;
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}
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static int wavpack_decode_init(AVCodecContext *avctx)
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{
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WavpackContext *s = avctx->priv_data;
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s->avctx = avctx;
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s->stereo = (avctx->channels == 2);
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return 0;
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}
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static int wavpack_decode_close(AVCodecContext *avctx)
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{
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// WavpackContext *s = avctx->priv_data;
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return 0;
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}
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static int wavpack_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf, int buf_size)
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{
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WavpackContext *s = avctx->priv_data;
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int16_t *samples = data;
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int samplecount;
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int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;
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uint8_t* buf_end = buf + buf_size;
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int i, j, id, size, ssize, weights, t;
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if (buf_size == 0){
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*data_size = 0;
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return 0;
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}
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memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
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s->samples = AV_RL32(buf); buf += 4;
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if(!s->samples){
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*data_size = 0;
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return buf_size;
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}
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/* should not happen but who knows */
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if(s->samples * 2 * avctx->channels > *data_size){
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av_log(avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc!\n");
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return -1;
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}
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s->joint = AV_RL32(buf) & WV_JOINT; buf += 4;
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s->CRC = AV_RL32(buf); buf += 4;
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// parse metadata blocks
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while(buf < buf_end){
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id = *buf++;
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size = *buf++;
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if(id & WP_IDF_LONG) {
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size |= (*buf++) << 8;
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size |= (*buf++) << 16;
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}
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size <<= 1; // size is specified in words
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ssize = size;
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if(id & WP_IDF_ODD) size--;
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if(size < 0){
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av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);
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break;
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}
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if(buf + ssize > buf_end){
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av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);
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break;
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}
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if(id & WP_IDF_IGNORE){
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buf += ssize;
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continue;
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}
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switch(id & WP_IDF_MASK){
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case WP_ID_DECTERMS:
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s->terms = size;
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if(s->terms > MAX_TERMS){
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av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
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buf += ssize;
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continue;
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}
|
|
for(i = 0; i < s->terms; i++) {
|
|
s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5;
|
|
s->decorr[s->terms - i - 1].delta = *buf >> 5;
|
|
buf++;
|
|
}
|
|
got_terms = 1;
|
|
break;
|
|
case WP_ID_DECWEIGHTS:
|
|
if(!got_terms){
|
|
av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
|
|
continue;
|
|
}
|
|
weights = size >> s->stereo;
|
|
if(weights > MAX_TERMS || weights > s->terms){
|
|
av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
|
|
buf += ssize;
|
|
continue;
|
|
}
|
|
for(i = 0; i < weights; i++) {
|
|
t = (int8_t)(*buf++);
|
|
s->decorr[s->terms - i - 1].weightA = t << 3;
|
|
if(s->decorr[s->terms - i - 1].weightA > 0)
|
|
s->decorr[s->terms - i - 1].weightA += (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
|
|
if(s->stereo){
|
|
t = (int8_t)(*buf++);
|
|
s->decorr[s->terms - i - 1].weightB = t << 3;
|
|
if(s->decorr[s->terms - i - 1].weightB > 0)
|
|
s->decorr[s->terms - i - 1].weightB += (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
|
|
}
|
|
}
|
|
got_weights = 1;
|
|
break;
|
|
case WP_ID_DECSAMPLES:
|
|
if(!got_terms){
|
|
av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
|
|
continue;
|
|
}
|
|
t = 0;
|
|
for(i = s->terms - 1; (i >= 0) && (t < size); i--) {
|
|
if(s->decorr[i].value > 8){
|
|
s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
|
|
s->decorr[i].samplesA[1] = wp_exp2(AV_RL16(buf)); buf += 2;
|
|
if(s->stereo){
|
|
s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
|
|
s->decorr[i].samplesB[1] = wp_exp2(AV_RL16(buf)); buf += 2;
|
|
t += 4;
|
|
}
|
|
t += 4;
|
|
}else if(s->decorr[i].value < 0){
|
|
s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
|
|
s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
|
|
t += 4;
|
|
}else{
|
|
for(j = 0; j < s->decorr[i].value; j++){
|
|
s->decorr[i].samplesA[j] = wp_exp2(AV_RL16(buf)); buf += 2;
|
|
if(s->stereo){
|
|
s->decorr[i].samplesB[j] = wp_exp2(AV_RL16(buf)); buf += 2;
|
|
}
|
|
}
|
|
t += s->decorr[i].value * 2 * avctx->channels;
|
|
}
|
|
}
|
|
got_samples = 1;
|
|
break;
|
|
case WP_ID_ENTROPY:
|
|
if(size != 6 * avctx->channels){
|
|
av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, got %i", 6 * avctx->channels, size);
|
|
buf += ssize;
|
|
continue;
|
|
}
|
|
for(i = 0; i < 3 * avctx->channels; i++){
|
|
s->median[i] = wp_exp2(AV_RL16(buf));
|
|
buf += 2;
|
|
}
|
|
got_entropy = 1;
|
|
break;
|
|
case WP_ID_DATA:
|
|
init_get_bits(&s->gb, buf, size * 8);
|
|
s->data_size = size * 8;
|
|
buf += size;
|
|
got_bs = 1;
|
|
break;
|
|
default:
|
|
buf += size;
|
|
}
|
|
if(id & WP_IDF_ODD) buf++;
|
|
}
|
|
if(!got_terms){
|
|
av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
|
|
return -1;
|
|
}
|
|
if(!got_weights){
|
|
av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
|
|
return -1;
|
|
}
|
|
if(!got_samples){
|
|
av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
|
|
return -1;
|
|
}
|
|
if(!got_entropy){
|
|
av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
|
|
return -1;
|
|
}
|
|
if(!got_bs){
|
|
av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
|
|
return -1;
|
|
}
|
|
|
|
if(s->stereo)
|
|
samplecount = wv_unpack_stereo(s, &s->gb, samples);
|
|
else
|
|
samplecount = wv_unpack_mono(s, &s->gb, samples);
|
|
*data_size = samplecount * 2;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
AVCodec wavpack_decoder = {
|
|
"wavpack",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_WAVPACK,
|
|
sizeof(WavpackContext),
|
|
wavpack_decode_init,
|
|
NULL,
|
|
wavpack_decode_close,
|
|
wavpack_decode_frame,
|
|
};
|