131 lines
2.2 KiB
C
131 lines
2.2 KiB
C
#include <fcntl.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <linux/cdrom.h>
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#include <tinyalsa/pcm.h>
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#define FRAMES 1
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#define SIZE CD_FRAMESIZE_RAW
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#define PERIOD 1024
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#define COUNT 2
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struct cdrom_read_audio sr;
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void forward( int signum )
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{
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sr.addr.lba+=3600;
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}
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void backward( int signum )
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{
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sr.addr.lba-=3600;
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}
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void weite_err( char * s )
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{
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char * p;
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p=s;
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while( *p )
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++p;
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write( STDERR_FILENO, s, p-s );
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}
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int main( int argc, char * argv[] )
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{
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int fdi, card=0, device=0;
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struct pcm * pcm;
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struct pcm_config config;
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char *msg, buff[SIZE*FRAMES];
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struct sigaction f_action, b_action;
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if( argc < 2 )
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{
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weite_err( "Usage: " );
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weite_err( argv[0] );
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weite_err( " /dev/sr0 (<card>) (<device>)\n" );
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goto err0;
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}
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if( (fdi=open( argv[1] , O_RDONLY | O_NONBLOCK )) < 0 )
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{
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weite_err( "couldn't open input device " );
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weite_err( argv[1] );
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weite_err( " \n" );
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goto err0;
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}
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switch( ioctl( fdi, CDROM_DRIVE_STATUS, 0 ) )
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{
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case CDS_NO_DISC:
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weite_err( "No disk\n" );
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goto err1;
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case CDS_DRIVE_NOT_READY:
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weite_err( "Drive not ready\n" );
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goto err1;
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case CDS_TRAY_OPEN:
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weite_err( "Tray open\n" );
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goto err1;
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case -1:
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weite_err( "Error\n" );
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goto err1;
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}
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switch( argc )
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{
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case 4:
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device = *argv[3] - '0';
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case 3:
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card = *argv[2] - '0';
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}
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/* Prepare signals */
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{
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f_action.sa_handler = forward ;
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b_action.sa_handler = backward ;
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sigaddset( &f_action.sa_mask, SIGUSR1 );
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sigaddset( &b_action.sa_mask, SIGUSR2 );
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sigaction( SIGUSR1, &f_action, NULL );
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sigaction( SIGUSR2, &b_action, NULL );
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}
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/* config pcm */
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{
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config.channels = 2;
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config.rate = 44100;
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config.format = PCM_FORMAT_S16_LE;
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config.period_size = PERIOD;
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config.period_count = COUNT;
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config.start_threshold = PERIOD;
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config.silence_threshold = PERIOD*COUNT;
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config.stop_threshold = PERIOD*COUNT;
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}
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/* config sr */
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{
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sr.buf = buff;
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sr.nframes = FRAMES;
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sr.addr_format = CDROM_LBA;
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}
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pcm = pcm_open( card, device, PCM_OUT , &config );
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sr.addr.lba=0;
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while( ioctl( fdi, CDROMREADAUDIO, &sr ) != -1 )
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{
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pcm_writei( pcm, buff, SIZE*FRAMES/4 );
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sr.addr.lba+=FRAMES;
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}
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pcm_close( pcm );
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close( fdi );
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return 0;
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err1:
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close( fdi );
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err0:
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return 1;
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}
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