//generate a fade-out curve by successively applying a gain drop
float fade_speed = dB_to_coefficient(dB_drop / (float) num_steps);
+ float coeff = GAIN_COEFF_UNITY;
for (int i = 1; i < (num_steps-1); i++) {
- float coeff = GAIN_COEFF_UNITY;
- for (int j = 0; j < i; j++) {
- coeff *= fade_speed;
- }
+ coeff *= fade_speed;
dst->fast_simple_add (len*(double)i/(double)num_steps, coeff);
}
}
static void
-merge_curves (boost::shared_ptr<Evoral::ControlList> dst,
- boost::shared_ptr<const Evoral::ControlList> curve1,
+merge_curves (boost::shared_ptr<Evoral::ControlList> dst,
+ boost::shared_ptr<const Evoral::ControlList> curve1,
boost::shared_ptr<const Evoral::ControlList> curve2)
{
Evoral::ControlList::EventList::size_type size = curve1->size();
if (size != curve2->size()) {
return;
}
-
+
Evoral::ControlList::const_iterator c1 = curve1->begin();
int count = 0;
for (Evoral::ControlList::const_iterator c2 = curve2->begin(); c2!=curve2->end(); c2++ ) {
float v1 = accurate_coefficient_to_dB((*c1)->value);
float v2 = accurate_coefficient_to_dB((*c2)->value);
-
+
double interp = v1 * ( 1.0-( (double)count / (double)size) );
interp += v2 * ( (double)count / (double)size );
* @param chan_n Channel.
* @param frames_per_pixel Number of samples to use to generate one peak value.
*/
-
+
ARDOUR::framecnt_t
AudioRegion::read_peaks (PeakData *buf, framecnt_t npeaks, framecnt_t offset, framecnt_t cnt, uint32_t chan_n, double frames_per_pixel) const
{
if (audio_source(chan_n)->read_peaks (buf, npeaks, offset, cnt, frames_per_pixel)) {
return 0;
- }
+ }
if (_scale_amplitude != 1.0f) {
for (framecnt_t n = 0; n < npeaks; ++n) {
*/
assert (cnt >= 0);
-
+
if (n_channels() == 0) {
return 0;
}
of any fade out that we are dealing with
*/
frameoffset_t fade_out_offset = 0;
-
+
/* Amount (length) of fade out that we are dealing with in this read */
framecnt_t fade_out_limit = 0;
framecnt_t fade_interval_start = 0;
/* Fade in */
-
+
if (_fade_in_active && _session.config.get_use_region_fades()) {
-
+
framecnt_t fade_in_length = (framecnt_t) _fade_in->back()->when;
/* see if this read is within the fade in */
-
+
if (internal_offset < fade_in_length) {
fade_in_limit = min (to_read, fade_in_length - internal_offset);
}
}
-
+
/* Fade out */
-
+
if (_fade_out_active && _session.config.get_use_region_fades()) {
-
+
/* see if some part of this read is within the fade out */
/* ................. >| REGION
fade_interval_start = max (internal_offset, _length - framecnt_t (_fade_out->back()->when));
framecnt_t fade_interval_end = min(internal_offset + to_read, _length.val());
-
+
if (fade_interval_end > fade_interval_start) {
/* (part of the) the fade out is in this buffer */
fade_out_limit = fade_interval_end - fade_interval_start;
/* APPLY FADES TO THE DATA IN mixdown_buffer AND MIX THE RESULTS INTO
* buf. The key things to realize here: (1) the fade being applied is
- * (as of April 26th 2012) just the inverse of the fade in curve (2)
+ * (as of April 26th 2012) just the inverse of the fade in curve (2)
* "buf" contains data from lower regions already. So this operation
* fades out the existing material.
*/
/* explicit inverse fade in curve (e.g. for constant
* power), so we have to fetch it.
*/
-
+
_inverse_fade_in->curve().get_vector (internal_offset, internal_offset + fade_in_limit, gain_buffer, fade_in_limit);
-
+
/* Fade the data from lower layers out */
for (framecnt_t n = 0; n < fade_in_limit; ++n) {
buf[n] *= gain_buffer[n];
}
-
+
/* refill gain buffer with the fade in */
-
+
_fade_in->curve().get_vector (internal_offset, internal_offset + fade_in_limit, gain_buffer, fade_in_limit);
-
+
} else {
-
+
/* no explicit inverse fade in, so just use (1 - fade
* in) for the fade out of lower layers
*/
-
+
_fade_in->curve().get_vector (internal_offset, internal_offset + fade_in_limit, gain_buffer, fade_in_limit);
-
+
for (framecnt_t n = 0; n < fade_in_limit; ++n) {
buf[n] *= 1 - gain_buffer[n];
}
if (opaque()) {
if (_inverse_fade_out) {
-
+
_inverse_fade_out->curve().get_vector (curve_offset, curve_offset + fade_out_limit, gain_buffer, fade_out_limit);
-
+
/* Fade the data from lower levels in */
for (framecnt_t n = 0, m = fade_out_offset; n < fade_out_limit; ++n, ++m) {
buf[m] *= gain_buffer[n];
}
-
+
/* fetch the actual fade out */
_fade_out->curve().get_vector (curve_offset, curve_offset + fade_out_limit, gain_buffer, fade_out_limit);
-
+
} else {
/* no explicit inverse fade out (which is
* actually a fade in), so just use (1 - fade
* out) for the fade in of lower layers
*/
-
+
_fade_out->curve().get_vector (curve_offset, curve_offset + fade_out_limit, gain_buffer, fade_out_limit);
-
+
for (framecnt_t n = 0, m = fade_out_offset; n < fade_out_limit; ++n, ++m) {
buf[m] *= 1 - gain_buffer[n];
}
buf[m] += mixdown_buffer[m] * gain_buffer[n];
}
}
-
+
/* MIX OR COPY THE REGION BODY FROM mixdown_buffer INTO buf */
framecnt_t const N = to_read - fade_in_limit - fade_out_limit;
if (to_read == 0) {
return 0;
}
-
+
if (chan_n < n_channels()) {
boost::shared_ptr<AudioSource> src = boost::dynamic_pointer_cast<AudioSource> (srcs[chan_n]);
}
} else {
-
+
/* use silence */
memset (buf, 0, sizeof (Sample) * to_read);
}
_fade_out->set_state (*grandchild, version);
}
}
-
+
if ((prop = child->property ("active")) != 0) {
if (string_is_affirmative (prop->value())) {
set_fade_out_active (true);
set_fade_out_active (false);
}
}
-
+
} else if ( (child->name() == "InverseFadeIn") || (child->name() == "InvFadeIn") ) {
XMLNode* grandchild = child->child ("AutomationList");
if (grandchild) {
_fade_in->fast_simple_add (len, GAIN_COEFF_UNITY);
reverse_curve (_inverse_fade_in.val(), _fade_in.val());
break;
-
+
case FadeSymmetric:
//start with a nearly linear cuve
_fade_in->fast_simple_add (0, 1);
_fade_out->fast_simple_add (len, GAIN_COEFF_SMALL);
reverse_curve (_inverse_fade_out.val(), _fade_out.val());
break;
-
- case FadeFast:
+
+ case FadeFast:
generate_db_fade (_fade_out.val(), len, num_steps, -60);
generate_inverse_power_curve (_inverse_fade_out.val(), _fade_out.val());
break;
-
- case FadeSlow:
+
+ case FadeSlow:
generate_db_fade (c1, len, num_steps, -1); //start off with a slow fade
generate_db_fade (c2, len, num_steps, -80); //end with a fast fade
merge_curves (_fade_out.val(), c1, c2);
_fade_out->fast_simple_add (len, GAIN_COEFF_SMALL);
reverse_curve (_inverse_fade_out.val(), _fade_out.val());
break;
-
+
case FadeSymmetric:
//start with a nearly linear cuve
_fade_out->fast_simple_add (0, 1);
if (len > _length) {
len = _length - 1;
}
-
+
if (len < 64) {
len = 64;
}
bool changed = _fade_out->extend_to (len);
if (changed) {
-
+
if (_inverse_fade_out) {
_inverse_fade_out->extend_to (len);
}
{
uint32_t chan_count = 0;
for (SourceList::const_iterator i = _sources.begin(); i != _sources.end(); ++i) {
-
+
boost::shared_ptr<SndFileSource> sndf = boost::dynamic_pointer_cast<SndFileSource>(*i);
if (sndf ) {
-
+
if (sndf->channel_count() > chan_count) {
chan_count = sndf->channel_count();
}
}
#endif // HAVE_COREAUDIO
}
-
+
return chan_count;
}
boost::scoped_array<Sample> loudest (new Sample[block_size]);
boost::scoped_array<Sample> buf (new Sample[block_size]);
+ assert (fade_length >= 0);
+ assert (min_length > 0);
+
framepos_t pos = _start;
- framepos_t const end = _start + _length - 1;
+ framepos_t const end = _start + _length;
AudioIntervalResult silent_periods;
- bool in_silence = false;
- frameoffset_t silence_start = 0;
- frameoffset_t silence_end = 0;
+ bool in_silence = true;
+ frameoffset_t silence_start = _start;
- framecnt_t continuous_signal = fade_length;
- framecnt_t hold_off = 0;
while (pos < end && !itt.cancel) {
+ framecnt_t cur_samples = 0;
+ framecnt_t const to_read = min (end - pos, block_size);
/* fill `loudest' with the loudest absolute sample at each instant, across all channels */
memset (loudest.get(), 0, sizeof (Sample) * block_size);
+
for (uint32_t n = 0; n < n_channels(); ++n) {
- read_raw_internal (buf.get(), pos, block_size, n);
- for (framecnt_t i = 0; i < block_size; ++i) {
+ cur_samples = read_raw_internal (buf.get(), pos, to_read, n);
+ for (framecnt_t i = 0; i < cur_samples; ++i) {
loudest[i] = max (loudest[i], abs (buf[i]));
}
}
/* now look for silence */
- for (framecnt_t i = 0; i < block_size; ++i) {
+ for (framecnt_t i = 0; i < cur_samples; ++i) {
bool const silence = abs (loudest[i]) < threshold;
if (silence && !in_silence) {
/* non-silence to silence */
in_silence = true;
- /* process last queued silent part if any */
- if (hold_off > 0) {
- assert (hold_off < fade_length);
- silence_end -= hold_off;
- if (silence_end - silence_start >= min_length) {
- silent_periods.push_back (std::make_pair (silence_start, silence_end));
- }
- }
- hold_off = 0;
-
- if (continuous_signal < fade_length) {
- silence_start = pos + i + fade_length - continuous_signal;
- } else {
- silence_start = pos + i;
- }
+ silence_start = pos + i + fade_length;
} else if (!silence && in_silence) {
/* silence to non-silence */
in_silence = false;
- hold_off = 0;
- if (pos + i - 1 - silence_start >= min_length) {
- /* queue silence */
- silence_end = pos + i - 1;
- hold_off = 1;
- }
- }
+ frameoffset_t silence_end = pos + i - 1 - fade_length;
- if (hold_off > 0) {
- assert (!in_silence);
- if (++hold_off >= fade_length) {
+ if (silence_end - silence_start >= min_length) {
silent_periods.push_back (std::make_pair (silence_start, silence_end));
- hold_off = 0;
}
}
-
- if (!silence) {
- ++continuous_signal;
- } else {
- continuous_signal = 0;
- }
}
- pos += block_size;
- itt.progress = (end-pos)/(double)_length;
+ pos += cur_samples;
+ itt.progress = (end - pos) / (double)_length;
+
+ if (cur_samples == 0) {
+ assert (pos >= end);
+ break;
+ }
}
- if (in_silence) {
+ if (in_silence && !itt.cancel) {
/* last block was silent, so finish off the last period */
- assert (hold_off == 0);
- if (continuous_signal < fade_length) {
- silence_start += fade_length - continuous_signal;
- }
- if (end - 1 - silence_start >= min_length) {
- silent_periods.push_back (std::make_pair (silence_start, end));
+ if (end - 1 - silence_start >= min_length + fade_length) {
+ silent_periods.push_back (std::make_pair (silence_start, end - 1));
}
}
} else {
rl = pl->regions_at (last_frame());
}
-
+
RegionList::iterator i;
boost::shared_ptr<Region> other;
uint32_t n = 0;
}
return min (length(), min (maxlen, len));
-
+
}
projects / ardour.git / blobdiff