ref: f6a42c50c040196f3f830d3e51d405d5ae2b8982
dir: /src/tx16w.c/
/* Yamaha TX-16W sampler file support * * May 20, 1993 * Copyright 1993 Rob Talley (rob@aii.com) * This source code is freely redistributable and may be used for * any purpose. This copyright notice and the following copyright * notice must be maintained intact. No warranty whatsoever is * provided. This code is furnished AS-IS as a component of the * larger work Copyright 1991 Lance Norskog and Sundry Contributors. * Much appreciation to ross-c for his sampConv utility for SGI/IRIX * from where these methods were derived. * * Jan 24, 1994 * Pat McElhatton, HP Media Technology Lab <patmc@apollo.hp.com> * Handles reading of files which do not have the sample rate field * set to one of the expected by looking at some other bytes in the * attack/loop length fields, and defaulting to 33kHz if the sample * rate is still unknown. * * January 12, 1995 * Copyright 1995 Mark Lakata (lakata@physics.berkeley.edu) * Additions to tx16w.c SOX driver. This version writes as well as * reads TX16W format. * * July 31, 1998 * Cleaned up by Leigh Smith (leigh@psychokiller.dialix.oz.au) * for incorporation into the main sox distribution. * * September 24, 1998 * Forced output to mono signed words to match input. It was basically * doing this anyways but now the user will see a display that its being * overriding. cbagwell@sprynet.com * */ #define TXMAXLEN 0x3FF80 /* * Sound Tools skeleton file format driver. */ #include <stdio.h> #include <string.h> #include "st.h" /* Private data for TX16 file */ typedef struct txwstuff { LONG rest; /* bytes remaining in sample file */ } *txw_t; IMPORT float volume, amplitude; IMPORT int summary, verbose; struct WaveHeader_ { char filetype[6]; /* = "LM8953", */ unsigned char nulls[10], dummy_aeg[6], /* space for the AEG (never mind this) */ format, /* 0x49 = looped, 0xC9 = non-looped */ sample_rate, /* 1 = 33 kHz, 2 = 50 kHz, 3 = 16 kHz */ atc_length[3], /* I'll get to this... */ rpt_length[3], unused[2]; /* set these to null, to be on the safe side */ } ; static unsigned char magic1[4] = {0, 0x06, 0x10, 0xF6}; static unsigned char magic2[4] = {0, 0x52, 0x00, 0x52}; static LONG tx16w_len=0; static LONG writedone=0; /* * Do anything required before you start reading samples. * Read file header. * Find out sampling rate, * size and style of samples, * mono/stereo/quad. */ void txwstartread(ft) ft_t ft; { int c; char filetype[7]; char format; char sample_rate; LONG num_samp_bytes = 0; char dummy; char gunk[8]; int blewIt; txw_t sk = (txw_t) ft->priv; /* If you need to seek around the input file. */ if (! ft->seekable) fail("txw input file must be a file, not a pipe"); /* This is dumb but portable, just count the bytes til EOF */ while ( getc(ft->fp) != EOF ) num_samp_bytes++; num_samp_bytes -= 32; /* calculate num samples by sub header size */ fseek(ft->fp,0L,0); /* rewind file */ sk->rest = num_samp_bytes; /* set how many sample bytes to read */ /* first 6 bytes are file type ID LM8953 */ filetype[0] = getc(ft->fp); filetype[1] = getc(ft->fp); filetype[2] = getc(ft->fp); filetype[3] = getc(ft->fp); filetype[4] = getc(ft->fp); filetype[5] = getc(ft->fp); filetype[6] = '\0'; for( c = 16; c > 0 ; c-- ) /* Discard next 16 bytes */ dummy = getc(ft->fp); /* they have no meaning here */ format = getc(ft->fp); sample_rate = getc(ft->fp); /* * save next 8 bytes - if sample rate is 0, then we need * to look at gunk[2] and gunk[5] to get real rate */ for( c = 0; c < 8; c++ ) gunk[c] = getc(ft->fp); /* * We should now be pointing at start of raw sample data in file */ /* Check to make sure we got a good filetype ID from file */ report("Found header filetype %s",filetype); if(strcmp(filetype,"LM8953")) fail("Invalid filetype ID in input file header, != LM8953"); /* * Set up the sample rate as indicated by the header */ switch( sample_rate ) { case 1: ft->info.rate = 33000; break; case 2: ft->info.rate = 50000; break; case 3: ft->info.rate = 16000; break; default: blewIt = 1; switch( gunk[2] & 0xFE ) { case 0x06: if ( (gunk[5] & 0xFE) == 0x52 ) { blewIt = 0; ft->info.rate = 33000; } break; case 0x10: if ( (gunk[5] & 0xFE) == 0x00 ) { blewIt = 0; ft->info.rate = 50000; } break; case 0xF6: if ( (gunk[5] & 0xFE) == 0x52 ) { blewIt = 0; ft->info.rate = 16000; } break; } if ( blewIt ) { report("Invalid sample rate identifier found %d", (int)sample_rate); ft->info.rate = 33000; } } report("Sample rate = %ld",ft->info.rate); ft->info.channels = 1 ; /* not sure about stereo sample data yet ??? */ ft->info.size = WORD; /* this is close enough */ ft->info.style = SIGN2; } /* * Read up to len samples from file. * Convert to signed LONGs. * Place in buf[]. * Return number of samples read. */ LONG txwread(ft, buf, len) ft_t ft; LONG *buf, len; { txw_t sk = (txw_t) ft->priv; int done = 0; unsigned char uc1,uc2,uc3; unsigned short s1,s2; /* * This gets called by the top level 'process' routine. * We will essentially get called with a buffer pointer * and a max length to read. Graciously, it is always * an even amount so we don't have to worry about * hanging onto the left over odd samples since there * won't be any. Something to look out for though :-( * We return the number of samples we read. * We will get called over and over again until we return * 0 bytes read. */ /* * This is ugly but it's readable! * Read three bytes from stream, then decompose these into * two unsigned short samples. * TCC 3.0 appeared to do unwanted things, so we really specify * exactly what we want to happen. * Convert unsigned short to LONG then shift up the result * so that the 12-bit sample lives in the most significant * 12-bits of the LONG. * This gets our two samples into the internal format which we * deposit into the given buffer and adjust our counts respectivly. */ for(done = 0; done < len; ) { if(sk->rest <= 0) break; /* Finished reading from file? */ uc1 = (unsigned char)getc(ft->fp); /* read the three bytes */ uc2 = (unsigned char)getc(ft->fp); uc3 = (unsigned char)getc(ft->fp); sk->rest -= 3; /* adjust remaining for bytes we just read */ s1 = (unsigned short) (uc1 << 4) | (((uc2 >> 4) & 017)); s2 = (unsigned short) (uc3 << 4) | (( uc2 & 017 )); *buf = (LONG) s1; *buf = (*buf << 20); buf++; /* sample one is done */ *buf = (LONG) s2; *buf = (*buf << 20); buf++; /* sample two is done */ done += 2; /* adjust converted & stored sample count */ } return done; } /* * Do anything required when you stop reading samples. * Don't close input file! */ void txwstopread(ft) ft_t ft; { } void txwstartwrite(ft) ft_t ft; { struct WaveHeader_ WH; report("tx16w selected output"); if (ft->info.channels != 1) report("tx16w is overriding output format to 1 channel."); ft->info.channels = 1 ; /* not sure about stereo sample data yet ??? */ if (ft->info.size != WORD || ft->info.style != SIGN2) report("tx16w is overriding output format to size Signed Word format."); ft->info.size = WORD; /* this is close enough */ ft->info.style = SIGN2; /* If you have to seek around the output file */ if (! ft->seekable) fail("Output .txw file must be a file, not a pipe"); /* dummy numbers, just for place holder, real header is written at end of processing, since byte count is needed */ fwrite(&WH,1,32,ft->fp); writedone = 32; } void txwwrite(ft, buf, len) ft_t ft; LONG *buf, len; { int i; unsigned int w1,w2; tx16w_len += len; if (tx16w_len > TXMAXLEN) return; for (i=0;i<len;i+=2) { w1 = *buf++ >> 20; if (i+1==len) w2 = 0; else { w2 = *buf++ >> 20; } putc((w1 >> 4) & 0xFF,ft->fp); putc((((w1 & 0x0F) << 4) | (w2 & 0x0F)) & 0xFF,ft->fp); putc((w2 >> 4) & 0xFF,ft->fp); writedone += 3; } } void txwstopwrite(ft) ft_t ft; { struct WaveHeader_ WH; int AttackLength, LoopLength, i; /* All samples are already written out. */ /* If file header needs fixing up, for example it needs the */ /* the number of samples in a field, seek back and write them here. */ /* If your format specifies any of the following info. */ /* ft->info.rate = ft->info.size = BYTE or WORD ...; ft->info.style = UNSIGNED or SIGN2 ...; ft->info.channels = 1 or 2 or 4; */ report("tx16w:output finished"); strncpy(WH.filetype,"LM8953",6); for (i=0;i<10;i++) WH.nulls[i]=0; for (i=0;i<6;i++) WH.dummy_aeg[i]=0; for (i=0;i<2;i++) WH.unused[i]=0; for (i=0;i<2;i++) WH.dummy_aeg[i] = 0; for (i=2;i<6;i++) WH.dummy_aeg[i] = 0x7F; WH.format = 0xC9; /* loop off */ /* the actual sample rate is not that important ! */ if (ft->info.rate < 24000) WH.sample_rate = 3; else if (ft->info.rate < 41000) WH.sample_rate = 1; else WH.sample_rate = 2; if (tx16w_len >= TXMAXLEN) { fprintf(stderr,"Sound too large for TX16W. Truncating, Loop Off\n"); AttackLength = TXMAXLEN/2; LoopLength = TXMAXLEN/2; } else if (tx16w_len >=TXMAXLEN/2) { AttackLength = TXMAXLEN/2; LoopLength = tx16w_len - TXMAXLEN/2; if (LoopLength < 0x40) { LoopLength +=0x40; AttackLength -= 0x40; } } else if (tx16w_len >= 0x80) { AttackLength = tx16w_len -0x40; LoopLength = 0x40; } else { AttackLength = 0x40; LoopLength = 0x40; for(i=tx16w_len;i<0x80;i++) { putc(0,ft->fp); putc(0,ft->fp); putc(0,ft->fp); writedone += 3; } } /* Fill up to 256 byte blocks; the TX16W seems to like that */ while ((writedone % 0x100) != 0) { putc(0,ft->fp); writedone++; } WH.atc_length[0] = 0xFF & AttackLength; WH.atc_length[1] = 0xFF & (AttackLength >> 8); WH.atc_length[2] = (0x01 & (AttackLength >> 16)) + magic1[WH.sample_rate]; WH.rpt_length[0] = 0xFF & LoopLength; WH.rpt_length[1] = 0xFF & (LoopLength >> 8); WH.rpt_length[2] = (0x01 & (LoopLength >> 16)) + magic2[WH.sample_rate]; rewind(ft->fp); fwrite(&WH,1,32,ft->fp); }