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/**********************************************************************
Copyright (c) 1991 MPEG/audio software simulation group, All Rights Reserved
musicout.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 3.9 *
* changes made since last update: *
* date programmers comment *
* 2/25/91 Douglas Wong start of version 1.0 records *
* 3/06/91 Douglas Wong rename setup.h to dedef.h *
* removed extraneous variables *
* removed window_samples (now part of *
* filter_samples) *
* 3/07/91 Davis Pan changed output file to "codmusic" *
* 5/10/91 Vish (PRISM) Ported to Macintosh and Unix. *
* Incorporated new "out_fifo()" which *
* writes out last incomplete buffer. *
* Incorporated all AIFF routines which *
* are also compatible with SUN. *
* Incorporated user interface for *
* specifying sound file names. *
* Also incorporated user interface for *
* writing AIFF compatible sound files. *
* 27jun91 dpwe (Aware) Added musicout and &sample_frames as *
* args to out_fifo (were glob refs). *
* Used new 'frame_params' struct. *
* Clean,simplify, track clipped output *
* and total bits/frame received. *
* 7/10/91 Earle Jennings changed to floats to FLOAT *
*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 *
* buffer_CRC and recover_CRC_error *
* Additions and revisions are marked *
* with "dhl" for clarity *
* 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. *
*19 aug 92 Soren H. Nielsen Changed MS-DOS file name extensions. *
* 8/27/93 Seymour Shlien, Fixes in Unix and MSDOS ports, *
* Daniel Lauzon, and *
* Bill Truerniet *
**********************************************************************/
#include "common.h"
#include "decoder.h"
/********************************************************************
/*
/* This part contains the MPEG I decoder for Layers I & II.
/*
/*********************************************************************/
/****************************************************************
/*
/* For MS-DOS user (Turbo c) change all instance of malloc
/* to _farmalloc and free to _farfree. Compiler model hugh
/* Also make sure all the pointer specified are changed to far.
/*
/*****************************************************************/
/*********************************************************************
/*
/* Core of the Layer II decoder. Default layer is Layer II.
/*
/*********************************************************************/
/* Global variable definitions for "musicout.c" */
char *programName;
/* Implementations */
main(argc, argv)
int argc;
char **argv;
{
typedef short PCM[2][3][SBLIMIT];
PCM FAR *pcm_sample;
typedef unsigned int SAM[2][3][SBLIMIT];
SAM FAR *sample;
typedef double FRA[2][3][SBLIMIT];
FRA FAR *fraction;
typedef double VE[2][HAN_SIZE];
VE FAR *w;
Bit_stream_struc bs;
frame_params fr_ps;
layer info;
FILE *musicout;
unsigned long sample_frames;
int i, j, k, stereo, done=FALSE, clip, sync;
int error_protection, crc_error_count, total_error_count;
unsigned int old_crc, new_crc;
unsigned int bit_alloc[2][SBLIMIT], scfsi[2][SBLIMIT],
scale_index[2][3][SBLIMIT];
unsigned long bitsPerSlot, samplesPerFrame, frameNum = 0;
unsigned long frameBits, gotBits = 0;
IFF_AIFF pcm_aiff_data;
char encoded_file_name[MAX_NAME_SIZE];
char decoded_file_name[MAX_NAME_SIZE];
char t[50];
int need_aiff;
int topSb = 0;
#ifdef MACINTOSH
console_options.nrows = MAC_WINDOW_SIZE;
argc = ccommand(&argv);
#endif
/* Most large variables are declared dynamically to ensure
compatibility with smaller machines */
pcm_sample = (PCM FAR *) mem_alloc((long) sizeof(PCM), "PCM Samp");
sample = (SAM FAR *) mem_alloc((long) sizeof(SAM), "Sample");
fraction = (FRA FAR *) mem_alloc((long) sizeof(FRA), "fraction");
w = (VE FAR *) mem_alloc((long) sizeof(VE), "w");
fr_ps.header = &info;
fr_ps.tab_num = -1; /* no table loaded */
fr_ps.alloc = NULL;
for (i=0;i<HAN_SIZE;i++) for (j=0;j<2;j++) (*w)[j][i] = 0.0;
programName = argv[0];
if(argc==1) { /* no command line args -> interact */
do {
printf ("Enter encoded file name <required>: ");
gets (encoded_file_name);
if (encoded_file_name[0] == NULL_CHAR)
printf ("Encoded file name is required. \n");
} while (encoded_file_name[0] == NULL_CHAR);
printf (">>> Encoded file name is: %s \n", encoded_file_name);
#ifdef MS_DOS
printf ("Enter MPEG decoded file name <%s>: ",
new_ext(encoded_file_name, DFLT_OPEXT)); /* 92-08-19 shn */
#else
printf ("Enter MPEG decoded file name <%s%s>: ", encoded_file_name,
DFLT_OPEXT);
#endif
gets (decoded_file_name);
if (decoded_file_name[0] == NULL_CHAR) {
#ifdef MS_DOS
/* replace old extension with new one, 92-08-19 shn */
strcpy(decoded_file_name,new_ext(encoded_file_name, DFLT_OPEXT));
#else
strcat (strcpy(decoded_file_name, encoded_file_name), DFLT_OPEXT);
#endif
}
printf (">>> MPEG decoded file name is: %s \n", decoded_file_name);
printf(
"Do you wish to write an AIFF compatible sound file ? (y/<n>) : ");
gets(t);
if (*t == 'y' || *t == 'Y') need_aiff = TRUE;
else need_aiff = FALSE;
if (need_aiff)
printf(">>> An AIFF compatible sound file will be written\n");
else printf(">>> A non-headered PCM sound file will be written\n");
printf(
"Do you wish to exit (last chance before decoding) ? (y/<n>) : ");
gets(t);
if (*t == 'y' || *t == 'Y') exit(0);
}
else { /* interpret CL Args */
int i=0, err=0;
need_aiff = FALSE;
encoded_file_name[0] = '\0';
decoded_file_name[0] = '\0';
while(++i<argc && err == 0) {
char c, *token, *arg, *nextArg;
int argUsed;
token = argv[i];
if(*token++ == '-') {
if(i+1 < argc) nextArg = argv[i+1];
else nextArg = "";
argUsed = 0;
while(c = *token++) {
if(*token /* NumericQ(token) */) arg = token;
else arg = nextArg;
switch(c) {
case 's': topSb = atoi(arg); argUsed = 1;
if(topSb<1 || topSb>SBLIMIT) {
fprintf(stderr, "%s: -s band %s not %d..%d\n",
programName, arg, 1, SBLIMIT);
err = 1;
}
break;
case 'A': need_aiff = TRUE; break;
default: fprintf(stderr,"%s: unrecognized 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(encoded_file_name[0] == '\0')
strcpy(encoded_file_name, argv[i]);
else
if(decoded_file_name[0] == '\0')
strcpy(decoded_file_name, argv[i]);
else {
fprintf(stderr,
"%s: excess arg %s\n", programName, argv[i]);
err = 1;
}
}
}
if(err || encoded_file_name[0] == '\0') usage(); /* never returns */
if(decoded_file_name[0] == '\0') {
strcpy(decoded_file_name, encoded_file_name);
strcat(decoded_file_name, DFLT_OPEXT);
}
}
/* report results of dialog / command line */
printf("Input file = '%s' output file = '%s'\n",
encoded_file_name, decoded_file_name);
if(need_aiff) printf("Output file written in AIFF format\n");
if(strcmp(decoded_file_name,"stdout") == 0) musicout = stdout;
else {
if ((musicout = fopen(decoded_file_name, "w+b")) == NULL) {
printf ("Could not create \"%s\".\n", decoded_file_name);
exit(1);
}
}
open_bit_stream_r(&bs, encoded_file_name, BUFFER_SIZE);
if (need_aiff)
if (aiff_seek_to_sound_data(musicout) == -1) {
printf("Could not seek to PCM sound data in \"%s\".\n",
decoded_file_name);
exit(1);
}
sample_frames = 0;
while (!end_bs(&bs)) {
sync = seek_sync(&bs, SYNC_WORD, SYNC_WORD_LNGTH);
frameBits = sstell(&bs) - gotBits;
if(frameNum > 0) /* don't want to print on 1st loop; no lay */
if(frameBits%bitsPerSlot)
fprintf(stderr,"Got %ld bits = %ld slots plus %ld\n",
frameBits, frameBits/bitsPerSlot, frameBits%bitsPerSlot);
gotBits += frameBits;
if (!sync) {
printf("Frame cannot be located\n");
printf("Input stream may be empty\n");
done = TRUE;
/* finally write out the buffer */
if (info.lay == 2) out_fifo(*pcm_sample, 3, &fr_ps, done,
musicout, &sample_frames);
else out_fifo(*pcm_sample, 1, &fr_ps, done,
musicout, &sample_frames);
break;
}
decode_info(&bs, &fr_ps);
hdr_to_frps(&fr_ps);
stereo = fr_ps.stereo;
error_protection = info.error_protection;
crc_error_count = 0;
total_error_count = 0;
if(frameNum == 0) WriteHdr(&fr_ps, stdout); /* printout layer/mode */
fprintf(stderr, "{%4lu}\r", frameNum++); fflush(stderr);
if (error_protection) buffer_CRC(&bs, &old_crc);
switch (info.lay) {
case 1: {
bitsPerSlot = 32; samplesPerFrame = 384;
I_decode_bitalloc(&bs,bit_alloc,&fr_ps);
I_decode_scale(&bs, bit_alloc, scale_index, &fr_ps);
if (error_protection) {
I_CRC_calc(&fr_ps, bit_alloc, &new_crc);
if (new_crc != old_crc) {
crc_error_count++;
total_error_count++;
recover_CRC_error(*pcm_sample, crc_error_count,
&fr_ps, musicout, &sample_frames);
break;
}
else crc_error_count = 0;
}
clip = 0;
for (i=0;i<SCALE_BLOCK;i++) {
I_buffer_sample(&bs,(*sample),bit_alloc,&fr_ps);
I_dequantize_sample(*sample,*fraction,bit_alloc,&fr_ps);
I_denormalize_sample((*fraction),scale_index,&fr_ps);
if(topSb>0) /* clear channels to 0 */
for(j=topSb; j<fr_ps.sblimit; ++j)
for(k=0; k<stereo; ++k)
(*fraction)[k][0][j] = 0;
for (j=0;j<stereo;j++) {
clip += SubBandSynthesis (&((*fraction)[j][0][0]), j,
&((*pcm_sample)[j][0][0]));
}
out_fifo(*pcm_sample, 1, &fr_ps, done,
musicout, &sample_frames);
}
if(clip > 0) printf("%d output samples clipped\n", clip);
break;
}
case 2: {
bitsPerSlot = 8; samplesPerFrame = 1152;
II_decode_bitalloc(&bs, bit_alloc, &fr_ps);
II_decode_scale(&bs, scfsi, bit_alloc, scale_index, &fr_ps);
if (error_protection) {
II_CRC_calc(&fr_ps, bit_alloc, scfsi, &new_crc);
if (new_crc != old_crc) {
crc_error_count++;
total_error_count++;
recover_CRC_error(*pcm_sample, crc_error_count,
&fr_ps, musicout, &sample_frames);
break;
}
else crc_error_count = 0;
}
clip = 0;
for (i=0;i<SCALE_BLOCK;i++) {
II_buffer_sample(&bs,(*sample),bit_alloc,&fr_ps);
II_dequantize_sample((*sample),bit_alloc,(*fraction),&fr_ps);
II_denormalize_sample((*fraction),scale_index,&fr_ps,i>>2);
if(topSb>0) /* debug : clear channels to 0 */
for(j=topSb; j<fr_ps.sblimit; ++j)
for(k=0; k<stereo; ++k)
(*fraction)[k][0][j] =
(*fraction)[k][1][j] =
(*fraction)[k][2][j] = 0;
for (j=0;j<3;j++) for (k=0;k<stereo;k++) {
clip += SubBandSynthesis (&((*fraction)[k][j][0]), k,
&((*pcm_sample)[k][j][0]));
}
out_fifo(*pcm_sample, 3, &fr_ps, done, musicout,
&sample_frames);
}
if(clip > 0) printf("%d samples clipped\n", clip);
break;
}
}
}
if (need_aiff) {
pcm_aiff_data.numChannels = stereo;
pcm_aiff_data.numSampleFrames = sample_frames;
pcm_aiff_data.sampleSize = 16;
pcm_aiff_data.sampleRate = s_freq[info.sampling_frequency]*1000;
#ifdef IFF_LONG
pcm_aiff_data.sampleType = IFF_ID_SSND;
#else
strncpy(&pcm_aiff_data.sampleType,IFF_ID_SSND,4);
#endif
pcm_aiff_data.blkAlgn.offset = 0;
pcm_aiff_data.blkAlgn.blockSize = 0;
if (aiff_write_headers(musicout, &pcm_aiff_data) == -1) {
printf("Could not write AIFF headers to \"%s\"\n",
decoded_file_name);
exit(2);
}
}
printf("Avg slots/frame = %.3f; b/smp = %.2f; br = %.3f kbps\n",
(FLOAT) gotBits / (frameNum * bitsPerSlot),
(FLOAT) gotBits / (frameNum * samplesPerFrame),
(FLOAT) gotBits / (frameNum * samplesPerFrame) *
s_freq[info.sampling_frequency]);
close_bit_stream_r(&bs);
fclose(musicout);
/* for the correct AIFF header information */
/* on the Macintosh */
/* the file type and the file creator for */
/* Macintosh compatible Digidesign is set */
#ifdef MACINTOSH
if (need_aiff) set_mac_file_attr(decoded_file_name, VOL_REF_NUM,
CREATR_DEC_AIFF, FILTYP_DEC_AIFF);
else set_mac_file_attr(decoded_file_name, VOL_REF_NUM,
CREATR_DEC_BNRY, FILTYP_DEC_BNRY);
#endif
printf("Decoding of \"%s\" is finished\n", encoded_file_name);
printf("The decoded PCM output file name is \"%s\"\n", decoded_file_name);
if (need_aiff)
printf("\"%s\" has been written with AIFF header information\n",
decoded_file_name);
exit( 0 );
}
static void usage() /* print syntax & exit */
{
fprintf(stderr,
"usage: %s queries for all arguments, or\n",
programName);
fprintf(stderr,
" %s [-A][-s sb] inputBS [outPCM]\n", programName);
fprintf(stderr,"where\n");
fprintf(stderr," -A write an AIFF output PCM sound file\n");
fprintf(stderr," -s sb resynth only up to this sb (debugging only)\n");
fprintf(stderr," inputBS input bit stream of encoded audio\n");
fprintf(stderr," outPCM output PCM sound file (dflt inName+%s)\n",
DFLT_OPEXT);
exit(1);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.