musicin.c

Motion JPEG编解码器源代码

/**********************************************************************
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: [e-mail]             *
 *                                                                    *
 * 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  [e-mail]  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                                             *
 * 2004/7/29  Steven Schultz    Cleanup and fix the pathname limit    *
 *                              once and for all.                     *
 * 2004/8/22  Steven Schultz    Make the code agree with the manpage  *
 *                              The manpage says that -V _forces_ VCD *
 *                              compatible mode.  Also, the VCD 2.0   *
 *                              specification permits 128, 192  and   *
 *                              384 kbit/sec rates for stereo (or dual*
 *                              mono) and 64,96 or 192 kbit/sec for   *
 *                              mono mode.  Since VCD2.0 came out in  *
 *                              1995 I think it's time to update this *
 *                              program ;)                            *
 *                              Make the default sampling rate 48000  *
 *                              if -V is NOT used - this will avoid   *
 *                              problems with folks encoding for DVDs.*
 **********************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "encoder.h"
#include "wav_io.h"

/* Global variable definitions for "musicin.c" */

FILE               *musicin;
Bit_stream_struc   bs;
int		   verbose = 1;
char               *programName;

/* Global variables */

int freq_in=0;
int freq_out=48000;
int chans_in=0;
int chans_out=0;
int audio_bits=0;
int32_t audio_bytes=0;

static void Usage(char *str)
{
  printf("Usage: %s [params] < input.wav\n",str);
  printf("   where possible params are:\n");
  printf( "  -v num  Level of verbosity. 0 = quiet, 1 = normal 2 = verbose/debug\n");
  printf("   -b num     Bitrate in KBit/sec (default: 224 KBit/s)\n");
  printf("   -l num     Layer number 1 or 2 (default: 2)\n");
  printf("   -o name    Outputfile name (REQUIRED)\n");
  printf("   -r num     Force output sampling rate to be num Hz (default: 48000)\n");
  printf("              num must be one of 32000, 44100, 48000\n");
  printf("   -s         Force stereo output (default)\n");
  printf("   -m         Force mono output\n");
  printf("   -e         Use CRC error protection\n");
  printf("   -V         Force VCD sampling rate (-r 44100) and perform bitrate/channel validity checks\n");
  printf("   -?         Print this lot out\n");
  exit(0);
}


static void
get_params(argc, argv,fr_ps,psy,num_samples,encoded_file_name)
int             argc;
char**          argv;
frame_params    *fr_ps;
int             *psy;
unsigned long   *num_samples;
char            **encoded_file_name;
{
    layer *info = fr_ps->header;
    int brt=224;
    char *outfilename = 0;
    int stereo = 1;
    int mono = 0;
    int video_cd = 0;
    int j, n;
    int audio_format;

    /* RJ: We set most params to fixed defaults: */

    info->lay = 2;
    info->emphasis = 0;
    info->extension = 0;
    info->error_protection = 0;
    info->copyright = 0;
    info->original = 0;
    info->mode_ext = 0;

    *psy = 2;
    *num_samples = MAX_U_32_NUM; /* Unlimited */

    while( (n=getopt(argc,argv,"b:o:l:r:smeVv:")) != EOF)
    {
        switch(n) {

		case 'b':
			brt = atoi(optarg);
			break;
		case 'o':
			outfilename = optarg;
			break;
		case 'r':
			freq_out = atoi(optarg);
    			if (freq_out!=32000 && freq_out!=44100 && freq_out!=48000)
       			mjpeg_error_exit1("-r requires one of 32000 44100 48000!");
			break;
		case 'l':
			info->lay = atoi(optarg);
    			if (info->lay!=2 && info->lay!=1)
       			mjpeg_error_exit1("-l requires 1 or 2!");
			break;
		case 's':
			stereo = 1;
			mono = 0;
			chans_out = 2;
			break;
		case 'm':
			mono = 1;
			stereo = 0;
    			chans_out = 1;
			break;
		case 'e':
                        info->error_protection = 1;
			break;
		case 'V':
			video_cd = 1;
			break;
	        case 'v':
			verbose = atoi(optarg);
			if( verbose < 0 || verbose > 2 )
				Usage(argv[0]);
			break;
		case '?':
			Usage(argv[0]);
        }
    }

    (void)mjpeg_default_handler_verbosity(verbose);

    if(argc!=optind) 
		Usage(argv[0]);

    if(outfilename==0)
    {
        mjpeg_error("Output file name (-o option) is required!");
        Usage(argv[0]);
    }

    *encoded_file_name = strdup(outfilename);
    if (*encoded_file_name == NULL)
       mjpeg_error_exit1("can not malloc %d bytes", strlen(outfilename));

    /* Read the WAV file header, make sanity checks */

    if(wav_read_header(stdin,&freq_in,&chans_in,&audio_bits,
                       &audio_format,&audio_bytes))
        mjpeg_error_exit1("failure reading WAV file");

    mjpeg_info("Opened WAV file, freq = %d Hz, channels = %d, bits = %d",
           freq_in, chans_in, audio_bits);
    mjpeg_info("format = 0x%x, audio length = %d bytes",audio_format,audio_bytes);

    if(audio_format!=1)
       mjpeg_error_exit1("WAV file is not in PCM format");

    if(audio_bits!=8 && audio_bits!=16)
       mjpeg_error_exit1("audio samples must have 8 or 16 bits");

    if(chans_in!=1 && chans_in!=2)
       mjpeg_error_exit1("can only handle files with 1 or 2 channels");

    if(chans_out==0) chans_out = chans_in;

    if(chans_out==1)
       info->mode = MPG_MD_MONO;
    else
       info->mode = MPG_MD_STEREO;
    if(video_cd && info->lay != 2 )
       mjpeg_error_exit1("Option -V requires layer II!");
    if	(video_cd)
        {
        freq_out=44100;
	if (chans_out == 2)
	   {
           switch (brt)
                  {
		  case	128:
		  case	192:
		  case	224:
		  case	384:
		        break;
		  default:
		        mjpeg_error_exit1("-b %d not valid with stereo. Bitrate must be 128, 192, 224 or 384", brt);
		  }
	    }
	else if (chans_out == 1)
	    {
	    switch (brt)
	           {
		   case 64:
		   case 96:
		   case 192:
		        break;
		   default:
		        mjpeg_error_exit1("-b %d not valid with mono. Bitrate must be 64, 96 or 192", brt);
		   }
	     }
        }

    if(freq_out==0) freq_out = freq_in;
    switch (freq_out) {
       case 48000 :
           info->sampling_frequency = 1;
           break;
       case 44100 :
           info->sampling_frequency = 0;
           break;
       case 32000 :
           info->sampling_frequency = 2;
           break;
       default:
           mjpeg_error_exit1("Frequency must be one of 32000 44100 48000"
					   " unless -r is used!");