www.pudn.com > wav_mp3_recorder.rar > encode.c

/* main.c 
 * Command line interface. 
 * 
 * This fixed point version of shine is based on Gabriel Bouvigne's original 
 * source, version 0.1.2 
 */ 
 
#include "types.h" 
 
config_t config; 
int cutoff; 
int raw; 
int mono_from_stereo; 
//int fd; 
//int mixerhander; 
/* 
 * error: 
 * ------ 
 */ 
void error(char *s) 
{ 
  printf("[ERROR] %s\n",s); 
  exit(1); 
} 
 
/* 
 * set_defaults: 
 * ------------- 
 */ 
static void set_defaults() 
{ 
  config.mpeg.type = MPEG1; 
  config.mpeg.layr = LAYER_3; 
  config.mpeg.mode = MODE_DUAL_CHANNEL; 
  config.mpeg.bitr = 48; 
  config.mpeg.psyc = 0; 
  config.mpeg.emph = 0; 
  config.mpeg.crc  = 0; 
  config.mpeg.ext  = 0; 
  config.mpeg.mode_ext  = 0; 
  config.mpeg.copyright = 0; 
  config.mpeg.original  = 1; 
  config.mpeg.channels = 1; 
  config.mpeg.granules = 1; 
  cutoff = 418; /* 16KHz @ 44.1Ksps */ 
  config.wave.samplerate = 44100; 
} 
 
/* 
 * find_samplerate_index: 
 * ---------------------- 
 */ 
static int find_samplerate_index(long freq) 
{ 
  static long sr[4][3] = {{11025, 12000,  8000},   /* mpeg 2.5 */ 
                          {    0,     0,     0},   /* reserved */ 
                          {22050, 24000, 16000},   /* mpeg 2 */ 
                          {44100, 48000, 32000}};  /* mpeg 1 */ 
  int i, j; 
 
  for(j=0; j<4; j++) 
    for(i=0; i<3; i++) 
      if((freq == sr[j][i]) && (j != 1)) 
      { 
        config.mpeg.type = j; 
        return i; 
      } 
 
  error("Invalid samplerate"); 
  return 0; 
} 
 
/* 
 * find_bitrate_index: 
 * ------------------- 
 */ 
static int find_bitrate_index(int bitr) 
{ 
  static long br[2][15] = 
    {{0, 8,16,24,32,40,48,56, 64, 80, 96,112,128,144,160},   /* mpeg 2/2.5 */ 
     {0,32,40,48,56,64,80,96,112,128,160,192,224,256,320}};  /* mpeg 1 */ 
  int i; 
 
  for(i=1; i<15; i++) 
    if(bitr==br[config.mpeg.type & 1][i]) return i; 
 
  error("Invalid bitrate"); 
  return 0; 
} 
 
int set_cutoff(void) 
{ 
  static int cutoff_tab[3][2][15] = 
  { 
    { /* 44.1k, 22.05k, 11.025k */ 
      {100,104,131,157,183,209,261,313,365,418,418,418,418,418,418}, /* stereo */ 
      {183,209,261,313,365,418,418,418,418,418,418,418,418,418,418}  /* mono */ 
    }, 
    { /* 48k, 24k, 12k */ 
      {100,104,131,157,183,209,261,313,384,384,384,384,384,384,384}, /* stereo */ 
      {183,209,261,313,365,384,384,384,384,384,384,384,384,384,384}  /* mono */ 
    }, 
    { /* 32k, 16k, 8k */ 
      {100,104,131,157,183,209,261,313,365,418,522,576,576,576,576}, /* stereo */ 
      {183,209,261,313,365,418,522,576,576,576,576,576,576,576,576}  /* mono */ 
    } 
  }; 
 
  return cutoff_tab[config.mpeg.samplerate_index] 
                   [config.mpeg.mode == MODE_MONO] 
                   [config.mpeg.bitrate_index]; 
} 
 
/* 
 * check_config: 
 * ------------- 
 */ 
static void check_config() 
{ 
  static char *mode_names[4]    = { "stereo", "j-stereo", "dual-ch", "mono" }; 
  static char *layer_names[4]   = { "", "III", "II", "I" }; 
  static char *version_names[4] = { "MPEG 2.5", "", "MPEG 2", "MPEG 1" }; 
  static char *psy_names[3]     = { "none", "MUSICAM", "Shine" }; 
  static char *demp_names[4]    = { "none", "50/15us", "", "CITT" }; 
 
  config.mpeg.samplerate_index = find_samplerate_index(config.wave.samplerate); 
  config.mpeg.bitrate_index    = find_bitrate_index(config.mpeg.bitr); 
  cutoff = set_cutoff(); 
 
  printf("%s layer %s, %s  Psychoacoustic Model: %s\n", 
           version_names[config.mpeg.type], 
           layer_names[config.mpeg.layr], 
           mode_names[config.mpeg.mode], 
           psy_names[config.mpeg.psyc] ); 
  printf("Bitrate=%d kbps  ",config.mpeg.bitr ); 
  printf("De-emphasis: %s   %s %s\n", 
           demp_names[config.mpeg.emph], 
           (config.mpeg.original) ? "Original" : "", 
           (config.mpeg.copyright) ? "(C)" : "" ); 
} 
 
/* 
  wave_initial 
  */ 
void wave_initial(void) 
{ 
	long length; 
	raw = 0; 
	mono_from_stereo = 1; 
	set_defaults(); 
 
	//config.outfile = "/home/src/shine8/hello.mp3"; 
 
	config.mpeg.bitr = BITRATE; 
	config.wave.samplerate = RATE;  
	 
  length = 1152; 
	config.wave.channels = 1; 
	config.wave.bits = 16; 
	config.wave.length = length/(2*config.wave.samplerate); 
	config.wave.total_samples = length/2; 
	 
	config.mpeg.channels = 1; 
  config.mpeg.mode = MODE_MONO; 
} 
 
/* 
 initial all 
 */ 
int Mp3_Initial(void) 
{ 
	int i; 
	wave_initial(); 
	check_config();  
	 
  Mp3_Encode_Initial(); 
  printf("begin recorde...\n"); 
  return 1; 
}