diff options
| -rw-r--r-- | libs/ardour/ardour/audioregion.h | 9 | ||||
| -rw-r--r-- | libs/ardour/audioregion.cc | 42 |
2 files changed, 48 insertions, 3 deletions
diff --git a/libs/ardour/ardour/audioregion.h b/libs/ardour/ardour/audioregion.h index c3003e587b..d25cf0e421 100644 --- a/libs/ardour/ardour/audioregion.h +++ b/libs/ardour/ardour/audioregion.h @@ -82,8 +82,17 @@ class LIBARDOUR_API AudioRegion : public Region gain_t scale_amplitude() const { return _scale_amplitude; } void normalize (float, float target_in_dB = 0.0f); + + /** @return the maximum (linear) amplitude of the region, or a -ve + * number if the Progress object reports that the process was cancelled. + */ double maximum_amplitude (Progress* p = 0) const; + /** @return the maximum (rms) signal power of the region, or a -1 + * if the Progress object reports that the process was cancelled. + */ + double rms (Progress* p = 0) const; + bool envelope_active () const { return _envelope_active; } bool fade_in_active () const { return _fade_in_active; } bool fade_out_active () const { return _fade_out_active; } diff --git a/libs/ardour/audioregion.cc b/libs/ardour/audioregion.cc index 391dcfb2d3..873d4119d4 100644 --- a/libs/ardour/audioregion.cc +++ b/libs/ardour/audioregion.cc @@ -1402,9 +1402,6 @@ AudioRegion::set_scale_amplitude (gain_t g) send_change (PropertyChange (Properties::scale_amplitude)); } -/** @return the maximum (linear) amplitude of the region, or a -ve - * number if the Progress object reports that the process was cancelled. - */ double AudioRegion::maximum_amplitude (Progress* p) const { @@ -1444,6 +1441,45 @@ AudioRegion::maximum_amplitude (Progress* p) const return maxamp; } +double +AudioRegion::rms (Progress* p) const +{ + framepos_t fpos = _start; + framepos_t const fend = _start + _length; + uint32_t const n_chan = n_channels (); + double rms = 0; + + framecnt_t const blocksize = 64 * 1024; + Sample buf[blocksize]; + + framecnt_t total = 0; + + if (n_chan == 0) { + return 0; + } + + while (fpos < fend) { + framecnt_t const to_read = min (fend - fpos, blocksize); + total += to_read; + for (uint32_t c = 0; c < n_chan; ++c) { + if (read_raw_internal (buf, fpos, to_read, c) != to_read) { + return 0; + } + for (framepos_t i = 0; i < to_read; ++i) { + rms += buf[i] * buf[i]; + } + fpos += to_read; + if (p) { + p->set_progress (float (fpos - _start) / _length); + if (p->cancelled ()) { + return -1; + } + } + } + } + return sqrt (rms / (double)(total * n_chan)); +} + /** Normalize using a given maximum amplitude and target, so that region * _scale_amplitude becomes target / max_amplitude. */ |