mirror of
https://github.com/vgmstream/vgmstream.git
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352 lines
10 KiB
C
352 lines
10 KiB
C
/* originally from nwatowav.cc 2007.7.28 version, which read: */
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/*
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* Copyright 2001-2007 jagarl / Kazunori Ueno <jagarl@creator.club.ne.jp>
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted.
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*
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* このプログラムの作者は jagarl です。
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*
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* このプログラム、及びコンパイルによって生成したバイナリは
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* プログラムを変更する、しないにかかわらず再配布可能です。
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* その際、上記 Copyright 表示を保持するなどの条件は課しま
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* せん。対応が面倒なのでバグ報告を除き、メールで連絡をする
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* などの必要もありません。ソースの一部を流用することを含め、
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* ご自由にお使いください。
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*
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* THIS SOFTWARE IS PROVIDED BY KAZUNORI 'jagarl' UENO ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KAZUNORI UENO BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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*/
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#include <stdlib.h>
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#include "nwa_decoder.h"
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/* can serve up 8 bits at a time */
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static int
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getbits (STREAMFILE *file, off_t *offset, int *shift, int bits)
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{
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int ret;
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if (*shift > 8)
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{
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++*offset;
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*shift -= 8;
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}
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ret = read_16bitLE(*offset,file) >> *shift;
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*shift += bits;
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return ret & ((1 << bits) - 1); /* mask */
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}
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NWAData *
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open_nwa (STREAMFILE * streamFile, const char *filename)
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{
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int i;
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NWAData * const nwa = malloc(sizeof(NWAData));
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if (!nwa) goto fail;
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nwa->channels = read_16bitLE(0x00,streamFile);
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nwa->bps = read_16bitLE(0x02,streamFile);
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nwa->freq = read_32bitLE(0x04,streamFile);
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nwa->complevel = read_32bitLE(0x08,streamFile);
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nwa->blocks = read_32bitLE(0x10,streamFile);
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nwa->datasize = read_32bitLE(0x14,streamFile);
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nwa->compdatasize = read_32bitLE(0x18,streamFile);
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nwa->samplecount = read_32bitLE(0x1c,streamFile);
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nwa->blocksize = read_32bitLE(0x20,streamFile);
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nwa->restsize = read_32bitLE(0x24,streamFile);
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nwa->offsets = NULL;
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nwa->buffer = NULL;
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nwa->buffer_readpos = NULL;
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nwa->file = NULL;
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/* PCM not handled here */
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if (nwa->complevel < 0 || nwa->complevel > 5) goto fail;
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if (nwa->channels != 1 && nwa->channels != 2) goto fail;
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if (nwa->bps != 8 && nwa->bps != 16) goto fail;
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if (nwa->blocks <= 0) goto fail;
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if (nwa->compdatasize == 0
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|| get_streamfile_size(streamFile) != nwa->compdatasize) goto fail;
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if (nwa->datasize != nwa->samplecount * (nwa->bps/8)) goto fail;
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if (nwa->samplecount !=
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(nwa->blocks-1) * nwa->blocksize + nwa->restsize) goto fail;
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nwa->offsets = malloc(sizeof(off_t)*nwa->blocks);
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if (!nwa->offsets) goto fail;
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for (i = 0; i < nwa->blocks; i++)
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{
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int32_t o = read_32bitLE(0x2c+i*4,streamFile);
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if (o < 0) goto fail;
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nwa->offsets[i] = o;
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}
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if (nwa->offsets[nwa->blocks-1] >= nwa->compdatasize) goto fail;
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if (nwa->restsize > nwa->blocksize) nwa->buffer =
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malloc(sizeof(sample)*nwa->restsize);
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else nwa->buffer =
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malloc(sizeof(sample)*nwa->blocksize);
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if (nwa->buffer == NULL) goto fail;
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nwa->buffer_readpos = nwa->buffer;
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nwa->samples_in_buffer = 0;
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nwa->curblock = 0;
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/* if we got this far, it's probably safe */
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nwa->file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!nwa->file) goto fail;
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return nwa;
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fail:
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if (nwa)
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{
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close_nwa(nwa);
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}
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return NULL;
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}
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void
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close_nwa(NWAData * nwa)
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{
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if (!nwa) return;
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if (nwa->offsets)
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free (nwa->offsets);
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nwa->offsets = NULL;
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if (nwa->buffer)
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free (nwa->buffer);
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nwa->buffer = NULL;
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if (nwa->file)
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close_streamfile (nwa->file);
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nwa->file = NULL;
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free(nwa);
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}
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void
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reset_nwa(NWAData *nwa)
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{
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nwa->curblock = 0;
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nwa->buffer_readpos = nwa->buffer;
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nwa->samples_in_buffer = 0;
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}
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static int use_runlength(NWAData *nwa)
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{
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if (nwa->channels == 2 && nwa->bps == 16 && nwa->complevel == 2)
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{
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/* sw2 */
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return 0;
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}
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if (nwa->complevel == 5)
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{
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if (nwa->channels == 2) return 0; /* BGM*.nwa in Little Busters! */
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return 1; /* Tomoyo After (.nwk koe file) */
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}
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return 0;
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}
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static void
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nwa_decode_block(NWAData *nwa)
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{
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/* 今回読み込む／デコードするデータの大きさを得る */
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int curblocksize;
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if (nwa->curblock != nwa->blocks - 1)
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{
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curblocksize = nwa->blocksize * (nwa->bps / 8);
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//curcompsize = nwa->offsets[nwa->curblock + 1] - nwa->offsets[nwa->curblock];
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}
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else
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{
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curblocksize = nwa->restsize * (nwa->bps / 8);
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//curcompsize = nwa->blocksize * (nwa->bps / 8) * 2;
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}
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nwa->samples_in_buffer = 0;
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nwa->buffer_readpos = nwa->buffer;
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{
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sample d[2];
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int i;
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int shift = 0;
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off_t offset = nwa->offsets[nwa->curblock];
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int dsize = curblocksize / (nwa->bps / 8);
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int flip_flag = 0; /* stereo 用 */
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int runlength = 0;
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/* read initial sample value */
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for (i=0;i<nwa->channels;i++)
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{
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if (nwa->bps == 8) { d[i] = read_8bit(offset,nwa->file); }
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else /* bps == 16 */
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{
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d[i] = read_16bitLE(offset,nwa->file);
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offset += 2;
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}
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}
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for (i = 0; i < dsize; i++)
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{
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if (runlength == 0)
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{ /* コピーループ中でないならデータ読み込み */
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int type = getbits(nwa->file, &offset, &shift, 3);
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/* type により分岐：0, 1-6, 7 */
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if (type == 7)
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{
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/* 7 : 大きな差分 */
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/* RunLength() 有効時（CompLevel==5, 音声ファイル) では無効 */
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if (getbits(nwa->file, &offset, &shift, 1) == 1)
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{
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d[flip_flag] = 0; /* 未使用 */
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}
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else
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{
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int BITS, SHIFT;
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if (nwa->complevel >= 3)
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{
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BITS = 8;
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SHIFT = 9;
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}
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else
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{
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BITS = 8 - nwa->complevel;
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SHIFT = 2 + 7 + nwa->complevel;
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}
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{
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const int MASK1 = (1 << (BITS - 1));
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const int MASK2 = (1 << (BITS - 1)) - 1;
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int b = getbits(nwa->file, &offset, &shift, BITS);
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if (b & MASK1)
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d[flip_flag] -= (b & MASK2) << SHIFT;
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else
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d[flip_flag] += (b & MASK2) << SHIFT;
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}
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}
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}
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else if (type != 0)
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{
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/* 1-6 : 通常の差分 */
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int BITS, SHIFT;
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if (nwa->complevel >= 3)
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{
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BITS = nwa->complevel + 3;
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SHIFT = 1 + type;
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}
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else
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{
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BITS = 5 - nwa->complevel;
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SHIFT = 2 + type + nwa->complevel;
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}
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{
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const int MASK1 = (1 << (BITS - 1));
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const int MASK2 = (1 << (BITS - 1)) - 1;
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int b = getbits(nwa->file, &offset, &shift, BITS);
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if (b & MASK1)
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d[flip_flag] -= (b & MASK2) << SHIFT;
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else
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d[flip_flag] += (b & MASK2) << SHIFT;
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}
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}
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else
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{ /* type == 0 */
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/* ランレングス圧縮なしの場合はなにもしない */
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if (use_runlength(nwa))
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{
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/* ランレングス圧縮ありの場合 */
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runlength = getbits(nwa->file, &offset, &shift, 1);
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if (runlength == 1)
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{
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runlength = getbits(nwa->file, &offset, &shift, 2);
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if (runlength == 3)
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{
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runlength = getbits(nwa->file, &offset, &shift, 8);
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}
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}
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}
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}
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}
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else
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{
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runlength--;
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}
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if (nwa->bps == 8)
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{
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nwa->buffer[i] = d[flip_flag]*0x100;
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}
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else
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{
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nwa->buffer[i] = d[flip_flag];
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}
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nwa->samples_in_buffer++;
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if (nwa->channels == 2)
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flip_flag ^= 1; /* channel 切り替え */
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}
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}
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nwa->curblock++;
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return;
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}
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void
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seek_nwa(NWAData *nwa, int32_t seekpos)
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{
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int dest_block = seekpos/(nwa->blocksize/nwa->channels);
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int32_t remainder = seekpos%(nwa->blocksize/nwa->channels);
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nwa->curblock = dest_block;
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nwa_decode_block(nwa);
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nwa->buffer_readpos = nwa->buffer + remainder*nwa->channels;
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nwa->samples_in_buffer -= remainder*nwa->channels;
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}
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/* interface to vgmstream */
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void
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decode_nwa(NWAData *nwa, sample *outbuf,
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int32_t samples_to_do)
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{
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while (samples_to_do > 0)
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{
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int32_t samples_to_read;
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if (nwa->samples_in_buffer > 0)
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{
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samples_to_read = nwa->samples_in_buffer/nwa->channels;
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if (samples_to_read > samples_to_do)
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samples_to_read = samples_to_do;
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memcpy(outbuf,nwa->buffer_readpos,
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sizeof(sample)*samples_to_read*nwa->channels);
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nwa->buffer_readpos += samples_to_read*nwa->channels;
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nwa->samples_in_buffer -= samples_to_read*nwa->channels;
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outbuf += samples_to_read*nwa->channels;
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samples_to_do -= samples_to_read;
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}
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else
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{
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nwa_decode_block(nwa);
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}
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}
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}
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