static Tuple *metronom_probe_for_tuple(const char * filename, VFSFile *fd)
{
Tuple *tuple = tuple_new_from_filename(filename);
metronom_t metronom;
char *tmp = NULL;
if (metronom_get_cp(filename, &metronom, &tmp))
tuple_set_str(tuple, FIELD_TITLE, tmp);
str_unref(tmp);
return tuple;
}
static bool_t metronom_play (const char * filename, VFSFile * file)
{
metronom_t pmetronom;
int16_t data[BUF_SAMPLES];
int t = 0, tact, num;
int datagoal = 0;
int datamiddle = 0;
int datacurrent = datamiddle;
int datalast = datamiddle;
int data_form[TACT_FORM_MAX];
if (aud_input_open_audio(FMT_S16_NE, AUDIO_FREQ, 1) == 0)
return FALSE;
if (!metronom_get_cp(filename, &pmetronom, NULL))
{
fprintf (stderr, "Invalid metronom tact parameters in URI %s", filename);
return FALSE;
}
aud_input_set_bitrate(sizeof(data[0]) * 8 * AUDIO_FREQ);
tact = 60 * AUDIO_FREQ / pmetronom.bpm;
/* prepare weighted amplitudes */
for (num = 0; num < pmetronom.num; num++)
{
data_form[num] = MAX_AMPL * tact_form[pmetronom.id][num];
}
num = 0;
while (!aud_input_check_stop())
{
int i;
for (i = 0; i < BUF_SAMPLES; i++)
{
if (t == tact)
{
t = 0;
datagoal = data_form[num];
}
else if (t == 10)
{
datagoal = -data_form[num];
}
else if (t == 25)
{
datagoal = data_form[num];
/* circle through weighted amplitudes */
num++;
if (num >= pmetronom.num)
num = 0;
}
/* makes curve a little bit smoother */
data[i] = (datalast + datacurrent + datagoal) / 3;
datalast = datacurrent;
datacurrent = data[i];
if (t > 35)
datagoal = (datamiddle + 7 * datagoal) / 8;
t++;
}
aud_input_write_audio(data, BUF_BYTES);
}
return TRUE;
}
static gboolean metronom_play(InputPlayback *playback, const gchar *filename,
VFSFile *file, gint start_time, gint stop_time, gboolean pause)
{
metronom_t pmetronom;
gint16 data[BUF_SAMPLES];
gint t = 0, tact, num;
gint datagoal = 0;
gint datamiddle = 0;
gint datacurrent = datamiddle;
gint datalast = datamiddle;
gint data_form[TACT_FORM_MAX];
gboolean error = FALSE;
if (playback->output->open_audio(FMT_S16_LE, AUDIO_FREQ, 1) == 0)
{
error = TRUE;
goto error_exit;
}
if (!metronom_get_cp(filename, &pmetronom, NULL))
{
g_message("Invalid metronom tact parameters in URI %s", filename);
goto error_exit;
}
if (pause)
playback->output->pause(TRUE);
playback->set_params(playback, sizeof(data[0]) * 8 * AUDIO_FREQ, AUDIO_FREQ, 1);
tact = 60 * AUDIO_FREQ / pmetronom.bpm;
/* prepare weighted amplitudes */
for (num = 0; num < pmetronom.num; num++)
{
data_form[num] = MAX_AMPL * tact_form[pmetronom.id][num];
}
stop_flag = FALSE;
playback->set_pb_ready(playback);
num = 0;
while (!stop_flag)
{
gint i;
for (i = 0; i < BUF_SAMPLES; i++)
{
if (t == tact)
{
t = 0;
datagoal = data_form[num];
}
else if (t == 10)
{
datagoal = -data_form[num];
}
else if (t == 25)
{
datagoal = data_form[num];
/* circle through weighted amplitudes */
num++;
if (num >= pmetronom.num)
num = 0;
}
/* makes curve a little bit smoother */
data[i] = (datalast + datacurrent + datagoal) / 3;
datalast = datacurrent;
datacurrent = data[i];
if (t > 35)
datagoal = (datamiddle + 7 * datagoal) / 8;
t++;
}
if (!stop_flag)
playback->output->write_audio(data, BUF_BYTES);
}
error_exit:
stop_flag = TRUE;
playback->output->close_audio();
return !error;
}
