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Diffstat (limited to 'icedax/aiff.c')
| -rw-r--r-- | icedax/aiff.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/icedax/aiff.c b/icedax/aiff.c new file mode 100644 index 0000000..cd1d98d --- /dev/null +++ b/icedax/aiff.c @@ -0,0 +1,188 @@ +/* + * This file has been modified for the cdrkit suite. + * + * The behaviour and appearence of the program code below can differ to a major + * extent from the version distributed by the original author(s). + * + * For details, see Changelog file distributed with the cdrkit package. If you + * received this file from another source then ask the distributing person for + * a log of modifications. + * + */ + +/* @(#)aiff.c 1.5 01/10/27 Copyright 1998,1999 Heiko Eissfeldt */ +/*** + * CopyPolicy: GNU Public License 2 applies + * Copyright (C) by Heiko Eissfeldt + * + * + * --------------------------------------------------------------------- + * definitions for aiff pcm output + * --------------------------------------------------------------------- + */ + +#include "config.h" +#include <stdio.h> +#include <unixstd.h> +#include <strdefs.h> +#include <standard.h> +#include <schily.h> +#include "mytype.h" +#include "byteorder.h" +#include "sndfile.h" + +typedef UINT4 FOURCC; /* a four character code */ +typedef struct CHUNKHDR { + FOURCC ckid; /* chunk ID */ + UINT4 dwSize; /* chunk size */ +} CHUNKHDR; + +#define mmioFOURCC(ch0, ch1, ch2, ch3) \ + ((UINT4)(unsigned char)(ch3) | ((UINT4)(unsigned char)(ch2) << 8) | \ + ((UINT4)(unsigned char)(ch1) << 16) | ((UINT4)(unsigned char)(ch0) << 24)) + +#define FOURCC_FORM mmioFOURCC ('F', 'O', 'R', 'M') +#define FOURCC_AIFF mmioFOURCC ('A', 'I', 'F', 'F') +#define FOURCC_COMM mmioFOURCC ('C', 'O', 'M', 'M') +#define FOURCC_SSND mmioFOURCC ('S', 'S', 'N', 'D') + +typedef struct AIFFHDR { + CHUNKHDR formChk; + FOURCC formType; + + CHUNKHDR commChk; /* Common chunk */ + /* from now on, alignment prevents us from using the original types :-(( */ + unsigned char numChannels[2]; /* Audio Channels */ + unsigned char numSampleFrames[4]; /* # of samples */ + unsigned char samplesize[2]; /* bits per sample */ + unsigned char sample_rate[10]; /* sample rate in extended float */ + + unsigned char ssndChkid[4]; /* Sound data chunk */ + unsigned char dwSize[4]; /* size of chunk */ + unsigned char offset[4]; /* start of 1st sample */ + unsigned char blocksize[4]; /* aligned sound data block size */ +} AIFFHDR; + +static AIFFHDR AiffHdr; + +/* Prototypes */ +static int Format_samplerate(unsigned long rate, unsigned char the_rate[10]); +static int InitSound(int audio, long channels, unsigned long rate, + long nBitsPerSample, unsigned long expected_bytes); +static int ExitSound(int audio, unsigned long nBytesDone); +static unsigned long GetHdrSize(void); +static unsigned long InSizeToOutSize(unsigned long BytesToDo); + + +/* format the sample rate into an + bigendian 10-byte IEEE-754 floating point number + */ +static int Format_samplerate(unsigned long rate, unsigned char the_rate[10]) +{ + int i; + + /* normalize rate */ + for (i = 0; (rate & 0xffff) != 0; rate <<= 1, i++) { + if ((rate & 0x8000) != 0) { + break; + } + } + + /* set exponent and sign */ + the_rate[1] = 14-i; + the_rate[0] = 0x40; /* LSB = sign */ + + /* 16-bit part of mantisse for sample rate */ + the_rate[3] = rate & 0xff; + the_rate[2] = (rate >> 8) & 0xff; + + /* initialize lower digits of mantisse */ + the_rate[4] = the_rate[5] = the_rate[6] = + the_rate[7] = the_rate[8] = the_rate[9] = 0; + + return 0; +} + +static int InitSound(int audio, long channels, unsigned long rate, + long nBitsPerSample, unsigned long expected_bytes) +{ + UINT4 tmp; + + fillbytes(&AiffHdr, sizeof(AiffHdr), '\0'); + AiffHdr.formChk.ckid = cpu_to_be32(FOURCC_FORM); + AiffHdr.formChk.dwSize= cpu_to_be32(expected_bytes + + offset_of(AIFFHDR,blocksize)+sizeof(AiffHdr.blocksize) + - offsetof(AIFFHDR,formType)); + AiffHdr.formType = cpu_to_be32(FOURCC_AIFF); + + AiffHdr.commChk.ckid = cpu_to_be32(FOURCC_COMM); + AiffHdr.commChk.dwSize= cpu_to_be32(offset_of(AIFFHDR,ssndChkid) + - offset_of(AIFFHDR,numChannels)); + + AiffHdr.numChannels[1]= channels; + tmp = cpu_to_be32(expected_bytes/(channels * (nBitsPerSample/8))); + AiffHdr.numSampleFrames[0] = tmp >> 24; + AiffHdr.numSampleFrames[1] = tmp >> 16; + AiffHdr.numSampleFrames[2] = tmp >> 8; + AiffHdr.numSampleFrames[3] = tmp >> 0; + AiffHdr.samplesize[1] = nBitsPerSample; + Format_samplerate(rate, AiffHdr.sample_rate); + + memcpy(AiffHdr.ssndChkid, "SSND", 4); + tmp = cpu_to_be32(expected_bytes + offset_of(AIFFHDR,blocksize)+sizeof(AiffHdr.blocksize) - offset_of(AIFFHDR, offset)); + AiffHdr.dwSize[0] = tmp >> 24; + AiffHdr.dwSize[1] = tmp >> 16; + AiffHdr.dwSize[2] = tmp >> 8; + AiffHdr.dwSize[3] = tmp >> 0; + + return write (audio, &AiffHdr, sizeof (AiffHdr)); +} + +static int ExitSound(int audio, unsigned long nBytesDone ) +{ + UINT4 tmp; + + AiffHdr.formChk.dwSize= cpu_to_be32(nBytesDone + sizeof(AIFFHDR) + - offsetof(AIFFHDR,commChk)); + tmp = cpu_to_be32(nBytesDone/( + AiffHdr.numChannels[1] * AiffHdr.samplesize[1]/ULONG_C(8))); + AiffHdr.numSampleFrames[0] = tmp >> 24; + AiffHdr.numSampleFrames[1] = tmp >> 16; + AiffHdr.numSampleFrames[2] = tmp >> 8; + AiffHdr.numSampleFrames[3] = tmp >> 0; + + /* If an odd number of bytes has been written, + extend the chunk with one dummy byte. This is a requirement for AIFF. */ + if ((nBytesDone & 1) && (lseek(audio, 1L, SEEK_CUR) == -1)) { + return 0; + } + + /* goto beginning */ + if (lseek(audio, 0L, SEEK_SET) == -1) { + return 0; + } + return write (audio, &AiffHdr, sizeof (AiffHdr)); +} + +static unsigned long GetHdrSize() +{ + return sizeof( AiffHdr ); +} + +static unsigned long InSizeToOutSize(unsigned long BytesToDo) +{ + return BytesToDo; +} + +struct soundfile aiffsound = +{ + InitSound, /* init header method */ + ExitSound, /* exit header method */ + GetHdrSize, /* report header size method */ + /* get sound samples out */ + (int (*)(int audio, unsigned char *buf, unsigned long BytesToDo))write, + InSizeToOutSize, /* compressed? output file size */ + 1 /* needs big endian samples */ +}; + + |