www.pudn.com > ampegsrc.zip > MUSICIN.C
/**********************************************************************
Copyright (c) 1991 MPEG/audio software simulation group, All Rights Reserved
musicin.c
**********************************************************************/
/**********************************************************************
* MPEG/audio coding/decoding software, work in progress *
* NOT for public distribution until verified and approved by the *
* MPEG/audio committee. For further information, please contact *
* Davis Pan, 508-493-2241, e-mail: pan@3d.enet.dec.com *
* *
* VERSION 4.0 *
* changes made since last update: *
* date programmers comment *
* 3/01/91 Douglas Wong, start of version 1.1 records *
* Davis Pan *
* 3/06/91 Douglas Wong, rename: setup.h to endef.h *
* removed extraneous variables *
* 3/21/91 J.Georges Fritsch introduction of the bit-stream *
* package. This package allows you *
* to generate the bit-stream in a *
* binary or ascii format *
* 3/31/91 Bill Aspromonte replaced the read of the SB matrix *
* by an "code generated" one *
* 5/10/91 W. Joseph Carter Ported to Macintosh and Unix. *
* Incorporated Jean-Georges Fritsch's *
* "bitstream.c" package. *
* Modified to strictly adhere to *
* encoded bitstream specs, including *
* "Berlin changes". *
* Modified user interface dialog & code *
* to accept any input & output *
* filenames desired. Also added *
* de-emphasis prompt and final bail-out *
* opportunity before encoding. *
* Added AIFF PCM sound file reading *
* capability. *
* Modified PCM sound file handling to *
* process all incoming samples and fill *
* out last encoded frame with zeros *
* (silence) if needed. *
* Located and fixed numerous software *
* bugs and table data errors. *
* 27jun91 dpwe (Aware Inc) Used new frame_params struct. *
* Clear all automatic arrays. *
* Changed some variable names, *
* simplified some code. *
* Track number of bits actually sent. *
* Fixed padding slot, stereo bitrate *
* Added joint-stereo : scales L+R. *
* 6/12/91 Earle Jennings added fix for MS_DOS in obtain_param *
* 6/13/91 Earle Jennings added stack length adjustment before *
* main for MS_DOS *
* 7/10/91 Earle Jennings conversion of all float to FLOAT *
* port to MsDos from MacIntosh completed*
* 8/ 8/91 Jens Spille Change for MS-C6.00 *
* 8/22/91 Jens Spille new obtain_parameters() *
*10/ 1/91 S.I. Sudharsanan, Ported to IBM AIX platform. *
* Don H. Lee, *
* Peter W. Farrett *
*10/ 3/91 Don H. Lee implemented CRC-16 error protection *
* newly introduced functions are *
* I_CRC_calc, II_CRC_calc and encode_CRC*
* Additions and revisions are marked *
* with "dhl" for clarity *
*11/11/91 Katherine Wang Documentation of code. *
* (variables in documentation are *
* surround by the # symbol, and an '*'*
* denotes layer I or II versions) *
* 2/11/92 W. Joseph Carter Ported new code to Macintosh. Most *
* important fixes involved changing *
* 16-bit ints to long or unsigned in *
* bit alloc routines for quant of 65535 *
* and passing proper function args. *
* Removed "Other Joint Stereo" option *
* and made bitrate be total channel *
* bitrate, irrespective of the mode. *
* Fixed many small bugs & reorganized. *
* 2/25/92 Masahiro Iwadare made code cleaner and more consistent *
* 8/07/92 Mike Coleman make exit() codes return error status *
* made slight changes for portability *
*19 aug 92 Soren H. Nielsen Changed MS-DOS file name extensions. *
* 8/25/92 Shaun Astarabadi Replaced rint() function with explicit*
* rounding for portability with MSDOS. *
* 9/22/92 jddevine@aware.com Fixed _scale_factor_calc() calls. *
*10/19/92 Masahiro Iwadare added info->mode and info->mode_ext *
* updates for AIFF format files *
* 3/10/93 Kevin Peterson In parse_args, only set non default *
* bit rate if specified in arg list. *
* Use return value from aiff_read_hdrs *
* to fseek to start of sound data *
* 7/26/93 Davis Pan fixed bug in printing info->mode_ext *
* value for joint stereo condition *
* 8/27/93 Seymour Shlien, Fixes in Unix and MSDOS ports, *
* Daniel Lauzon, and *
* Bill Truerniet *
**********************************************************************/
#include
#include "common.h"
#include "encoder.h"
/* Global variable definitions for "musicin.c" */
FILE *musicin;
Bit_stream_struc bs;
char *programName;
/* Implementations */
/************************************************************************
/*
/* obtain_parameters
/*
/* PURPOSE: Prompts for and reads user input for encoding parameters
/*
/* SEMANTICS: The parameters read are:
/* - input and output filenames
/* - sampling frequency (if AIFF file, will read from the AIFF file header)
/* - layer number
/* - mode (stereo, joint stereo, dual channel or mono)
/* - psychoacoustic model (I or II)
/* - total bitrate, irrespective of the mode
/* - de-emphasis, error protection, copyright and original or copy flags
/*
/************************************************************************/
void
obtain_parameters(fr_ps,psy,num_samples,original_file_name,encoded_file_name)
frame_params *fr_ps;
int *psy;
unsigned long *num_samples;
char original_file_name[MAX_NAME_SIZE];
char encoded_file_name[MAX_NAME_SIZE];
{
int j;
int x;
char default_file_name[MAX_NAME_SIZE];
long int freq;
int model, brt;
char t[50];
IFF_AIFF pcm_aiff_data;
layer *info = fr_ps->header;
long soundPosition;
do {
printf("Enter PCM input file name : ");
gets(original_file_name);
if (original_file_name[0] == NULL_CHAR)
printf("PCM input file name is required.\n");
} while (original_file_name[0] == NULL_CHAR);
printf(">>> PCM input file name is: %s\n", original_file_name);
if ((musicin = fopen(original_file_name, "rb")) == NULL) {
printf("Could not find \"%s\".\n", original_file_name);
exit(1);
}
x=0;
while (x <= MAX_NAME_SIZE)
{
default_file_name[x] = NULL_CHAR;
++x;
}
x=0;
while (x <= 8)
{
default_file_name[x] = original_file_name[x];
if (original_file_name[++x] == '.')
x = 9;
}
strcat(default_file_name,DFLT_EXT);
printf("Enter MPEG encoded output file name <%s>: ",
default_file_name); /* 92-08-19 shn */
gets(encoded_file_name);
if (encoded_file_name[0] == NULL_CHAR) {
/* replace old extension with new one, 92-08-19 shn */
strcpy(encoded_file_name,default_file_name);
/*
strcat(strcpy(encoded_file_name, original_file_name), DFLT_EXT);
*/
}
printf(">>> MPEG encoded output file name is: %s\n", encoded_file_name);
open_bit_stream_w(&bs, encoded_file_name, BUFFER_SIZE);
if ((soundPosition = aiff_read_headers(musicin, &pcm_aiff_data)) != -1) {
printf(">>> Using Audio IFF sound file headers\n");
aiff_check(original_file_name, &pcm_aiff_data);
if (fseek(musicin, soundPosition, SEEK_SET) != 0) {
printf("Could not seek to PCM sound data in \"%s\".\n",
original_file_name);
exit(1);
}
info->sampling_frequency = SmpFrqIndex((long)pcm_aiff_data.sampleRate);
printf(">>> %.f Hz sampling frequency selected\n",
pcm_aiff_data.sampleRate);
/* Determine number of samples in sound file */
#ifndef MS_DOS
*num_samples = pcm_aiff_data.numChannels *
pcm_aiff_data.numSampleFrames;
#else
*num_samples = (long)(pcm_aiff_data.numChannels) *
(long)(pcm_aiff_data.numSampleFrames);
#endif
}
else { /* Not using Audio IFF sound file headers. */
printf("What is the sampling frequency? <44100>[Hz]: ");
gets(t);
freq = atol(t);
switch (freq) {
case 48000 : info->sampling_frequency = 1;
printf(">>> %ld Hz sampling freq selected\n", freq);
break;
case 44100 : info->sampling_frequency = 0;
printf(">>> %ld Hz sampling freq selected\n", freq);
break;
case 32000 : info->sampling_frequency = 2;
printf(">>> %ld Hz sampling freq selected\n", freq);
break;
default: info->sampling_frequency = 0;
printf(">>> Default 44.1 kHz samp freq selected\n");
}
if (fseek(musicin, 0, SEEK_SET) != 0) {
printf("Could not seek to PCM sound data in \"%s\".\n",
original_file_name);
exit(1);
}
/* Declare sound file to have "infinite" number of samples. */
*num_samples = MAX_U_32_NUM;
}
printf("Which layer do you want to use?\n");
printf("Available: Layer (1), Layer (<2>): ");
gets(t);
switch(*t){
case '1': info->lay = 1; printf(">>> Using Layer %s\n",t); break;
case '2': info->lay = 2; printf(">>> Using Layer %s\n",t); break;
default: info->lay = 2; printf(">>> Using default Layer 2\n"); break;
}
printf("Which mode do you want?\n");
printf("Available: ()tereo, (j)oint stereo, ");
printf("(d)ual channel, s(i)ngle Channel: ");
gets(t);
switch(*t){
case 's':
case 'S':
info->mode = MPG_MD_STEREO; info->mode_ext = 0;
printf(">>> Using mode %s\n",t);
break;
case 'j':
case 'J':
info->mode = MPG_MD_JOINT_STEREO;
printf(">>> Using mode %s\n",t);
break;
case 'd':
case 'D':
info->mode = MPG_MD_DUAL_CHANNEL; info->mode_ext = 0;
printf(">>> Using mode %s\n",t);
break;
case 'i':
case 'I':
info->mode = MPG_MD_MONO; info->mode_ext = 0;
printf(">>> Using mode %s\n",t);
break;
default:
info->mode = MPG_MD_STEREO; info->mode_ext = 0;
printf(">>> Using default stereo mode\n");
break;
}
printf("Which psychoacoustic model do you want to use? <2>: ");
gets(t);
model = atoi(t);
if (model > 2 || model < 1) {
printf(">>> Default model 2 selected\n");
*psy = 2;
}
else {
*psy = model;
printf(">>> Using psychoacoustic model %d\n", model);
}
printf("What is the total bitrate? <%u>[kbps]: ", DFLT_BRT);
gets(t);
brt = atoi(t);
if (brt == 0) brt = -10;
j=0;
while (j<15) {
if (bitrate[info->lay-1][j] == brt) break;
j++;
}
if (j==15) {
printf(">>> Using default %u kbps\n", DFLT_BRT);
for (j=0;j<15;j++)
if (bitrate[info->lay-1][j] == DFLT_BRT) {
info->bitrate_index = j;
break;
}
}
else{
info->bitrate_index = j;
printf(">>> Bitrate = %d kbps\n", bitrate[info->lay-1][j]);
}
printf("What type of de-emphasis should the decoder use?\n");
printf("Available: ()one, (5)0/15 microseconds, (c)citt j.17: ");
gets(t);
if (*t != 'n' && *t != '5' && *t != 'c') {
printf(">>> Using default no de-emphasis\n");
info->emphasis = 0;
}
else {
if (*t == 'n') info->emphasis = 0;
else if (*t == '5') info->emphasis = 1;
else if (*t == 'c') info->emphasis = 3;
printf(">>> Using de-emphasis %s\n",t);
}
/* Start 2. Part changes for CD Ver 3.2; jsp; 22-Aug-1991 */
printf("Do you want to set the private bit? (y/): ");
gets(t);
if (*t == 'y' || *t == 'Y') info->extension = 1;
else info->extension = 0;
if(info->extension) printf(">>> Private bit set\n");
else printf(">>> Private bit not set\n");
/* End changes for CD Ver 3.2; jsp; 22-Aug-1991 */
printf("Do you want error protection? (y/): ");
gets(t);
if (*t == 'y' || *t == 'Y') info->error_protection = TRUE;
else info->error_protection = FALSE;
if(info->error_protection) printf(">>> Error protection used\n");
else printf(">>> Error protection not used\n");
printf("Is the material copyrighted? (y/): ");
gets(t);
if (*t == 'y' || *t == 'Y') info->copyright = 1;
else info->copyright = 0;
if(info->copyright) printf(">>> Copyrighted material\n");
else printf(">>> Material not copyrighted\n");
printf("Is this the original? (y/): ");
gets(t);
if (*t == 'y' || *t == 'Y') info->original = 1;
else info->original = 0;
if(info->original) printf(">>> Original material\n");
else printf(">>> Material not original\n");
printf("Do you wish to exit (last chance before encoding)? (y/): ");
gets(t);
if (*t == 'y' || *t == 'Y') exit(0);
}
/************************************************************************
/*
/* parse_args
/*
/* PURPOSE: Sets encoding parameters to the specifications of the
/* command line. Default settings are used for parameters
/* not specified in the command line.
/*
/* SEMANTICS: The command line is parsed according to the following
/* syntax:
/*
/* -l is followed by the layer number
/* -m is followed by the mode
/* -p is followed by the psychoacoustic model number
/* -s is followed by the sampling rate
/* -b is followed by the total bitrate, irrespective of the mode
/* -d is followed by the emphasis flag
/* -c is followed by the copyright/no_copyright flag
/* -o is followed by the original/not_original flag
/* -e is followed by the error_protection on/off flag
/*
/* If the input file is in AIFF format, the sampling frequency is read
/* from the AIFF header.
/*
/* The input and output filenames are read into #inpath# and #outpath#.
/*
/************************************************************************/
void
parse_args(argc, argv, fr_ps, psy, num_samples, inPath, outPath)
int argc;
char **argv;
frame_params *fr_ps;
int *psy;
unsigned long *num_samples;
char inPath[MAX_NAME_SIZE];
char outPath[MAX_NAME_SIZE];
{
FLOAT srate;
int brate;
layer *info = fr_ps->header;
int err = 0, i = 0;
IFF_AIFF pcm_aiff_data;
long samplerate;
long soundPosition;
/* preset defaults */
inPath[0] = '\0'; outPath[0] = '\0';
info->lay = DFLT_LAY;
switch(DFLT_MOD) {
case 's': info->mode = MPG_MD_STEREO; info->mode_ext = 0; break;
case 'd': info->mode = MPG_MD_DUAL_CHANNEL; info->mode_ext=0; break;
case 'j': info->mode = MPG_MD_JOINT_STEREO; break;
case 'm': info->mode = MPG_MD_MONO; info->mode_ext = 0; break;
default:
fprintf(stderr, "%s: Bad mode dflt %c\n", programName, DFLT_MOD);
abort();
}
*psy = DFLT_PSY;
if((info->sampling_frequency = SmpFrqIndex((long)(1000*DFLT_SFQ))) < 0) {
fprintf(stderr, "%s: bad sfrq default %.2f\n", programName, DFLT_SFQ);
abort();
}
if((info->bitrate_index = BitrateIndex(info->lay, DFLT_BRT)) < 0) {
fprintf(stderr, "%s: bad default bitrate %u\n", programName, DFLT_BRT);
abort();
}
switch(DFLT_EMP) {
case 'n': info->emphasis = 0; break;
case '5': info->emphasis = 1; break;
case 'c': info->emphasis = 3; break;
default:
fprintf(stderr, "%s: Bad emph dflt %c\n", programName, DFLT_EMP);
abort();
}
info->copyright = 0; info->original = 0; info->error_protection = FALSE;
/* process args */
while(++ilay = atoi(arg); argUsed = 1;
if(info->lay<1 || info->lay>2) {
fprintf(stderr,"%s: -l layer must be 1 or 2, not %s\n",
programName, arg);
err = 1;
}
break;
case 'm': argUsed = 1;
if (*arg == 's')
{ info->mode = MPG_MD_STEREO; info->mode_ext = 0; }
else if (*arg == 'd')
{ info->mode = MPG_MD_DUAL_CHANNEL; info->mode_ext=0; }
else if (*arg == 'j')
{ info->mode = MPG_MD_JOINT_STEREO; }
else if (*arg == 'm')
{ info->mode = MPG_MD_MONO; info->mode_ext = 0; }
else {
fprintf(stderr,"%s: -m mode must be s/d/j/m not %s\n",
programName, arg);
err = 1;
}
break;
case 'p': *psy = atoi(arg); argUsed = 1;
if(*psy<1 || *psy>2) {
fprintf(stderr,"%s: -p model must be 1 or 2, not %s\n",
programName, arg);
err = 1;
}
break;
case 's':
argUsed = 1;
srate = atof( arg );
/* samplerate = rint( 1000.0 * srate ); $A */
samplerate = (long) (( 1000.0 * srate ) + 0.5);
if( (info->sampling_frequency = SmpFrqIndex((long) samplerate)) < 0 )
err = 1;
break;
case 'b':
argUsed = 1;
brate = atoi(arg);
if( (info->bitrate_index = BitrateIndex(info->lay, brate)) < 0)
err=1;
break;
case 'd': argUsed = 1;
if (*arg == 'n') info->emphasis = 0;
else if (*arg == '5') info->emphasis = 1;
else if (*arg == 'c') info->emphasis = 3;
else {
fprintf(stderr,"%s: -d emp must be n/5/c not %s\n",
programName, arg);
err = 1;
}
break;
case 'c': info->copyright = 1; break;
case 'o': info->original = 1; break;
case 'e': info->error_protection = TRUE; break;
default: fprintf(stderr,"%s: unrec option %c\n",
programName, c);
err = 1; break;
}
if(argUsed) {
if(arg == token) token = ""; /* no more from token */
else ++i; /* skip arg we used */
arg = ""; argUsed = 0;
}
}
}
else {
if(inPath[0] == '\0') strcpy(inPath, argv[i]);
else if(outPath[0] == '\0') strcpy(outPath, argv[i]);
else {
fprintf(stderr,"%s: excess arg %s\n", programName, argv[i]);
err = 1;
}
}
}
if(err || inPath[0] == '\0') usage(); /* never returns */
if(outPath[0] == '\0') {
strcpy(outPath, inPath);
strcat(outPath, DFLT_EXT);
}
if ((musicin = fopen(inPath, "rb")) == NULL) {
printf("Could not find \"%s\".\n", inPath);
exit(1);
}
open_bit_stream_w(&bs, outPath, BUFFER_SIZE);
if ((soundPosition = aiff_read_headers(musicin, &pcm_aiff_data)) != -1) {
printf(">>> Using Audio IFF sound file headers\n");
aiff_check(inPath, &pcm_aiff_data);
if (fseek(musicin, soundPosition, SEEK_SET) != 0) {
printf("Could not seek to PCM sound data in \"%s\".\n", inPath);
exit(1);
}
info->sampling_frequency = SmpFrqIndex((long)pcm_aiff_data.sampleRate);
printf(">>> %.f Hz sampling frequency selected\n",
pcm_aiff_data.sampleRate);
/* Determine number of samples in sound file */
#ifndef MS_DOS
*num_samples = pcm_aiff_data.numChannels *
pcm_aiff_data.numSampleFrames;
#else
*num_samples = (long)(pcm_aiff_data.numChannels) *
(long)(pcm_aiff_data.numSampleFrames);
#endif
if ( pcm_aiff_data.numChannels == 1 ) {
info->mode = MPG_MD_MONO;
info->mode_ext = 0;
}
}
else { /* Not using Audio IFF sound file headers. */
if (fseek(musicin, 0, SEEK_SET) != 0) {
printf("Could not seek to PCM sound data in \"%s\".\n", inPath);
exit(1);
}
/* Declare sound file to have "infinite" number of samples. */
*num_samples = MAX_U_32_NUM;
}
}
/************************************************************************
/*
/* print_config
/*
/* PURPOSE: Prints the encoding parameters used
/*
/************************************************************************/
void
print_config(fr_ps, psy, num_samples, inPath, outPath)
frame_params *fr_ps;
int *psy;
unsigned long *num_samples;
char inPath[MAX_NAME_SIZE];
char outPath[MAX_NAME_SIZE];
{
layer *info = fr_ps->header;
printf("Encoding configuration:\n");
if(info->mode != MPG_MD_JOINT_STEREO)
printf("Layer=%s mode=%s extn=%d psy model=%d\n",
layer_names[info->lay-1], mode_names[info->mode],
info->mode_ext, *psy);
else printf("Layer=%s mode=%s extn=data dependant psy model=%d\n",
layer_names[info->lay-1], mode_names[info->mode], *psy);
printf("samp frq=%.1f kHz total bitrate=%d kbps\n",
s_freq[info->sampling_frequency],
bitrate[info->lay-1][info->bitrate_index]);
printf("de-emph=%d c/right=%d orig=%d errprot=%d\n",
info->emphasis, info->copyright, info->original,
info->error_protection);
printf("input file: '%s' output file: '%s'\n", inPath, outPath);
}
/************************************************************************
/*
/* main
/*
/* PURPOSE: MPEG I Encoder supporting layers 1 and 2, and
/* psychoacoustic models 1 (MUSICAM) and 2 (AT&T)
/*
/* SEMANTICS: One overlapping frame of audio of up to 2 channels are
/* processed at a time in the following order:
/* (associated routines are in parentheses)
/*
/* 1. Filter sliding window of data to get 32 subband
/* samples per channel.
/* (window_subband,filter_subband)
/*
/* 2. If joint stereo mode, combine left and right channels
/* for subbands above #jsbound#.
/* (*_combine_LR)
/*
/* 3. Calculate scalefactors for the frame, and if layer 2,
/* also calculate scalefactor select information.
/* (*_scale_factor_calc)
/*
/* 4. Calculate psychoacoustic masking levels using selected
/* psychoacoustic model.
/* (*_Psycho_One, psycho_anal)
/*
/* 5. Perform iterative bit allocation for subbands with low
/* mask_to_noise ratios using masking levels from step 4.
/* (*_main_bit_allocation)
/*
/* 6. If error protection flag is active, add redundancy for
/* error protection.
/* (*_CRC_calc)
/*
/* 7. Pack bit allocation, scalefactors, and scalefactor select
/* information (layer 2) onto bitstream.
/* (*_encode_bit_alloc,*_encode_scale,II_transmission_pattern)
/*
/* 8. Quantize subbands and pack them into bitstream
/* (*_subband_quantization, *_sample_encoding)
/*
/************************************************************************/
main(argc, argv)
int argc;
char **argv;
{
typedef double SBS[2][3][SCALE_BLOCK][SBLIMIT];
SBS FAR *sb_sample;
typedef double JSBS[3][SCALE_BLOCK][SBLIMIT];
JSBS FAR *j_sample;
typedef double IN[2][HAN_SIZE];
IN FAR *win_que;
typedef unsigned int SUB[2][3][SCALE_BLOCK][SBLIMIT];
SUB FAR *subband;
frame_params fr_ps;
layer info;
char original_file_name[MAX_NAME_SIZE];
char encoded_file_name[MAX_NAME_SIZE];
short FAR **win_buf;
static short FAR buffer[2][1152];
static unsigned int bit_alloc[2][SBLIMIT], scfsi[2][SBLIMIT];
static unsigned int scalar[2][3][SBLIMIT], j_scale[3][SBLIMIT];
static double FAR ltmin[2][SBLIMIT], lgmin[2][SBLIMIT], max_sc[2][SBLIMIT];
FLOAT snr32[32];
short sam[2][1056];
int whole_SpF, extra_slot = 0;
double avg_slots_per_frame, frac_SpF, slot_lag;
int model, stereo, error_protection;
static unsigned int crc;
int i, j, k, adb;
unsigned long bitsPerSlot, samplesPerFrame, frameNum = 0;
unsigned long frameBits, sentBits = 0;
unsigned long num_samples;
#ifdef MACINTOSH
console_options.nrows = MAC_WINDOW_SIZE;
argc = ccommand(&argv);
#endif
/* Most large variables are declared dynamically to ensure
compatibility with smaller machines */
sb_sample = (SBS FAR *) mem_alloc(sizeof(SBS), "sb_sample");
j_sample = (JSBS FAR *) mem_alloc(sizeof(JSBS), "j_sample");
win_que = (IN FAR *) mem_alloc(sizeof(IN), "Win_que");
subband = (SUB FAR *) mem_alloc(sizeof(SUB),"subband");
win_buf = (short FAR **) mem_alloc(sizeof(short *)*2, "win_buf");
/* clear buffers */
memset((char *) buffer, 0, sizeof(buffer));
memset((char *) bit_alloc, 0, sizeof(bit_alloc));
memset((char *) scalar, 0, sizeof(scalar));
memset((char *) j_scale, 0, sizeof(j_scale));
memset((char *) scfsi, 0, sizeof(scfsi));
memset((char *) ltmin, 0, sizeof(ltmin));
memset((char *) lgmin, 0, sizeof(lgmin));
memset((char *) max_sc, 0, sizeof(max_sc));
memset((char *) snr32, 0, sizeof(snr32));
memset((char *) sam, 0, sizeof(sam));
fr_ps.header = &info;
fr_ps.tab_num = -1; /* no table loaded */
fr_ps.alloc = NULL;
info.version = MPEG_AUDIO_ID;
programName = argv[0];
if(argc==1) /* no command-line args */
obtain_parameters(&fr_ps, &model, &num_samples,
original_file_name, encoded_file_name);
else
parse_args(argc, argv, &fr_ps, &model, &num_samples,
original_file_name, encoded_file_name);
print_config(&fr_ps, &model, &num_samples,
original_file_name, encoded_file_name);
hdr_to_frps(&fr_ps);
stereo = fr_ps.stereo;
error_protection = info.error_protection;
if (info.lay == 1) { bitsPerSlot = 32; samplesPerFrame = 384; }
else { bitsPerSlot = 8; samplesPerFrame = 1152; }
/* Figure average number of 'slots' per frame. */
/* Bitrate means TOTAL for both channels, not per side. */
avg_slots_per_frame = ((double)samplesPerFrame /
s_freq[info.sampling_frequency]) *
((double)bitrate[info.lay-1][info.bitrate_index] /
(double)bitsPerSlot);
whole_SpF = (int) avg_slots_per_frame;
printf("slots/frame = %d\n",whole_SpF);
frac_SpF = avg_slots_per_frame - (double)whole_SpF;
slot_lag = -frac_SpF;
printf("frac SpF=%.3f, tot bitrate=%d kbps, s freq=%.1f kHz\n",
frac_SpF, bitrate[info.lay-1][info.bitrate_index],
s_freq[info.sampling_frequency]);
if (frac_SpF != 0)
printf("Fractional number of slots, padding required\n");
else info.padding = 0;
while (get_audio(musicin, buffer, num_samples, stereo, info.lay) > 0) {
fprintf(stderr, "{%4lu}", frameNum++); fflush(stderr);
win_buf[0] = &buffer[0][0];
win_buf[1] = &buffer[1][0];
if (frac_SpF != 0) {
if (slot_lag > (frac_SpF-1.0) ) {
slot_lag -= frac_SpF;
extra_slot = 0;
info.padding = 0;
/* printf("No padding for this frame\n"); */
}
else {
extra_slot = 1;
info.padding = 1;
slot_lag += (1-frac_SpF);
/* printf("Padding for this frame\n"); */
}
}
adb = (whole_SpF+extra_slot) * bitsPerSlot;
switch (info.lay) {
/***************************** Layer I **********************************/
case 1 :
for (j=0;j coding (dflt %4u)\n",DFLT_LAY);
fprintf(stderr," -m mode channel mode : s/d/j/m (dflt %4c)\n",DFLT_MOD);
fprintf(stderr," -p psy psychoacoustic model 1/2 (dflt %4u)\n",DFLT_PSY);
fprintf(stderr," -s sfrq input smpl rate in kHz (dflt %4.1f)\n",DFLT_SFQ);
fprintf(stderr," -b br total bitrate in kbps (dflt %4u)\n",DFLT_BRT);
fprintf(stderr," -d emp de-emphasis n/5/c (dflt %4c)\n",DFLT_EMP);
fprintf(stderr," -c mark as copyright\n");
fprintf(stderr," -o mark as original\n");
fprintf(stderr," -e add error protection\n");
fprintf(stderr," inputPCM input PCM sound file (standard or AIFF)\n");
fprintf(stderr," outBS output bit stream of encoded audio (dflt inName+%s)\n",
DFLT_EXT);
exit(1);
}
/************************************************************************
/*
/* aiff_check
/*
/* PURPOSE: Checks AIFF header information to make sure it is valid.
/* Exits if not.
/*
/************************************************************************/
void aiff_check(file_name, pcm_aiff_data)
char *file_name; /* Pointer to name of AIFF file */
IFF_AIFF *pcm_aiff_data; /* Pointer to AIFF data structure */
{
#ifdef IFF_LONG
if (pcm_aiff_data->sampleType != IFF_ID_SSND) {
#else
if (strncmp(&pcm_aiff_data->sampleType,IFF_ID_SSND,4)) {
#endif
printf("Sound data is not PCM in \"%s\".\n", file_name);
exit(1);
}
if(SmpFrqIndex((long)pcm_aiff_data->sampleRate) < 0) {
printf("in \"%s\".\n", file_name);
exit(1);
}
if (pcm_aiff_data->sampleSize != sizeof(short) * BITS_IN_A_BYTE) {
printf("Sound data is not %d bits in \"%s\".\n",
sizeof(short) * BITS_IN_A_BYTE, file_name);
exit(1);
}
if (pcm_aiff_data->numChannels != MONO &&
pcm_aiff_data->numChannels != STEREO) {
printf("Sound data is not mono or stereo in \"%s\".\n", file_name);
exit(1);
}
if (pcm_aiff_data->blkAlgn.blockSize != 0) {
printf("Block size is not %lu bytes in \"%s\".\n", 0, file_name);
exit(1);
}
if (pcm_aiff_data->blkAlgn.offset != 0) {
printf("Block offset is not %lu bytes in \"%s\".\n", 0, file_name);
exit(1);
}
}