static inline void maybe_do_fft( void)
{
if( ++grab_cnt < FFTWID) return;
grab_cnt = 0;
process_fft( &left);
if( CF_chans == 2) process_fft( &right);
if( ++frame_cnt == output_int)
{
frame_cnt = 0;
output_record();
}
if( ++uspec_cnt == uspec_max)
{
uspec_cnt = 0;
utility_spectrum();
}
}
enum mad_flow output(void *data,
struct mad_header const *header,
struct mad_pcm *pcm)
{
register int nsamples = pcm->length;
mad_fixed_t const *left_ch = pcm->samples[0], *right_ch = pcm->samples[1];
static unsigned char stream[1152*4]; /* 1152 because that's what mad has as a max; *4 because
there are 4 distinct bytes per sample (in 2 channel case) */
static unsigned int rate = 0;
static int channels = 0;
static struct audio_dither dither;
register char * ptr = stream;
register signed int sample;
register mad_fixed_t tempsample;
/* Semaphore operations */
static struct sembuf read_sops = {0, -1, 0};
static struct sembuf write_sops = {1, 1, 0};
if(options.opt & MPG321_ENABLE_BUFFER)
{
semop(semarray,&read_sops,1);
ptr = (Output_Queue+mad_decoder_position)->data;
memcpy(&((Output_Queue+mad_decoder_position)->header),header,sizeof(struct mad_header));
}else{
/* We need to know information about the file before we can open the playdevice
in some cases. So, we do it here. */
if (!playdevice)
{
channels = MAD_NCHANNELS(header);
rate = header->samplerate;
open_ao_playdevice(header);
}
else if ((channels != MAD_NCHANNELS(header) || rate != header->samplerate) && playdevice_is_live())
{
ao_close(playdevice);
channels = MAD_NCHANNELS(header);
rate = header->samplerate;
open_ao_playdevice(header);
}
}
static int peak_rate = 0;
static unsigned short int peak = 0;
if (pcm->channels == 2)
{
while (nsamples--)
{
tempsample = mad_f_mul(*left_ch++, options.volume);
sample = (signed int) audio_linear_dither(16, tempsample, &dither);
peak = abs(sample) > peak ? abs(sample) : peak;
#ifndef WORDS_BIGENDIAN
*ptr++ = (unsigned char) (sample >> 0);
*ptr++ = (unsigned char) (sample >> 8);
#else
*ptr++ = (unsigned char) (sample >> 8);
*ptr++ = (unsigned char) (sample >> 0);
#endif
tempsample = mad_f_mul(*right_ch++, options.volume);
sample = (signed int) audio_linear_dither(16, tempsample, &dither);
peak = abs(sample) > peak ? abs(sample) : peak;
#ifndef WORDS_BIGENDIAN
*ptr++ = (unsigned char) (sample >> 0);
*ptr++ = (unsigned char) (sample >> 8);
#else
*ptr++ = (unsigned char) (sample >> 8);
*ptr++ = (unsigned char) (sample >> 0);
#endif
}
process_fft(stream, pcm->length * 4);
if(options.opt & MPG321_ENABLE_BUFFER)
{
(Output_Queue+mad_decoder_position)->length = pcm->length * 4;
}else
{
ao_play(playdevice, stream, pcm->length * 4);
}
}
else if (options.opt & MPG321_FORCE_STEREO)
enum mad_flow output(void *data,
struct mad_header const *header,
struct mad_pcm *pcm)
{
register int nsamples = pcm->length;
mad_fixed_t const *left_ch = pcm->samples[0], *right_ch = pcm->samples[1];
static unsigned char stream[1152*4]; /* 1152 because that's what mad has as a max; *4 because
there are 4 distinct bytes per sample (in 2 channel case) */
static unsigned int rate = 0;
static int channels = 0;
static struct audio_dither dither;
register char * ptr = stream;
register signed int sample;
register mad_fixed_t tempsample;
/* We need to know information about the file before we can open the playdevice
in some cases. So, we do it here. */
if (!playdevice)
{
channels = MAD_NCHANNELS(header);
rate = header->samplerate;
open_ao_playdevice(header);
}
else if ((channels != MAD_NCHANNELS(header) || rate != header->samplerate) && playdevice_is_live())
{
ao_close(playdevice);
channels = MAD_NCHANNELS(header);
rate = header->samplerate;
open_ao_playdevice(header);
}
static int peak_rate = 0;
static unsigned short int peak = 0;
if (pcm->channels == 2)
{
while (nsamples--)
{
tempsample = (mad_fixed_t)((*left_ch++ * (double)options.volume)/MAD_F_ONE);
sample = (signed int) audio_linear_dither(16, tempsample, &dither);
peak = abs(sample) > peak ? abs(sample) : peak;
#ifndef WORDS_BIGENDIAN
*ptr++ = (unsigned char) (sample >> 0);
*ptr++ = (unsigned char) (sample >> 8);
#else
*ptr++ = (unsigned char) (sample >> 8);
*ptr++ = (unsigned char) (sample >> 0);
#endif
tempsample = (mad_fixed_t)((*right_ch++ * (double)options.volume)/MAD_F_ONE);
sample = (signed int) audio_linear_dither(16, tempsample, &dither);
peak = abs(sample) > peak ? abs(sample) : peak;
#ifndef WORDS_BIGENDIAN
*ptr++ = (unsigned char) (sample >> 0);
*ptr++ = (unsigned char) (sample >> 8);
#else
*ptr++ = (unsigned char) (sample >> 8);
*ptr++ = (unsigned char) (sample >> 0);
#endif
}
process_fft(stream, pcm->length * 4);
ao_play(playdevice, stream, pcm->length * 4);
}
else if (options.opt & MPG321_FORCE_STEREO)