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git-svn-id: http://svn.openzap.org/svn/openzap/trunk@235 a93c3328-9c30-0410-af19-c9cd2b2d52af
This commit is contained in:
Anthony Minessale
2007-06-07 05:13:39 +00:00
parent d852547058
commit 19bf0794a7
4 changed files with 30 additions and 17 deletions
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32
libs/freetdm/src/include/libteletone_generate.h
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@@ -112,12 +112,12 @@ extern float powf (float, float);
#define TELETONE_VOL_DB_MAX 0
#define TELETONE_VOL_DB_MIN -63
#define MAX_PHASE_TONES 4
struct teletone_dds_state {
uint32_t phase_rate;
uint32_t phase_rate[MAX_PHASE_TONES];
uint32_t scale_factor;
uint32_t phase_accumulator;
int16_t sample;
teletone_process_t tx_level;
};
typedef struct teletone_dds_state teletone_dds_state_t;
@@ -131,11 +131,20 @@ typedef struct teletone_dds_state teletone_dds_state_t;
extern int16_t TELETONE_SINES[SINE_TABLE_MAX];
static __inline__ int16_t teletone_dds_modulate_sample(teletone_dds_state_t *dds)
static __inline__ int32_t teletone_dds_phase_rate(teletone_process_t tone, uint32_t rate)
{
return (int32_t) ((tone * MAX_PHASE_ACCUMULATOR) / rate);
}
static __inline__ int16_t teletone_dds_state_modulate_sample(teletone_dds_state_t *dds, uint32_t pindex)
{
int32_t bitmask = dds->phase_accumulator, sine_index = (bitmask >>= 23) & SINE_TABLE_LEN;
int16_t sample;
if (pindex >= MAX_PHASE_TONES) {
pindex = 0;
}
if (bitmask & SINE_TABLE_MAX) {
sine_index = SINE_TABLE_LEN - sine_index;
}
@@ -146,7 +155,7 @@ static __inline__ int16_t teletone_dds_modulate_sample(teletone_dds_state_t *dds
sample *= -1;
}
dds->phase_accumulator += dds->phase_rate;
dds->phase_accumulator += dds->phase_rate[pindex];
return (int16_t) (sample * dds->scale_factor >> 15);
}
@@ -154,19 +163,22 @@ static __inline__ int16_t teletone_dds_modulate_sample(teletone_dds_state_t *dds
static __inline__ void teletone_dds_state_set_tx_level(teletone_dds_state_t *dds, float tx_level)
{
dds->scale_factor = (int) (powf(10.0f, (tx_level - DBM0_MAX_POWER) / 20.0f) * (32767.0f * 1.414214f));
dds->tx_level = tx_level;
}
static __inline__ void teletone_dds_state_set_tone(teletone_dds_state_t *dds, teletone_process_t tone, uint32_t rate, float tx_level)
static __inline__ void teletone_dds_state_reset_accum(teletone_dds_state_t *dds)
{
dds->phase_accumulator = 0;
dds->phase_rate = (int32_t) ((tone * MAX_PHASE_ACCUMULATOR) / rate);
}
if (dds->tx_level != tx_level || !dds->scale_factor) {
teletone_dds_state_set_tx_level(dds, tx_level);
static __inline__ int teletone_dds_state_set_tone(teletone_dds_state_t *dds, teletone_process_t tone, uint32_t rate, uint32_t pindex)
{
if (pindex < MAX_PHASE_TONES) {
dds->phase_rate[pindex] = teletone_dds_phase_rate(tone, rate);
return 0;
}
dds->tx_level = tx_level;
return -1;
}