Allow gain factor for audio sources.

In preparation for archiving files as .flac (fixed point),
normalized with gain factor.

1 files changed, 15 insertions, 3 deletions

diff --git a/libs/ardour/sndfilesource.cc b/libs/ardour/sndfilesource.cc
index 54b9a0135c..2e7df7f918 100644
--- a/libs/ardour/sndfilesource.cc
+++ b/libs/ardour/sndfilesource.cc
@@ -523,6 +523,11 @@ SndFileSource::read_unlocked (Sample *dst, framepos_t start, framecnt_t cnt) con
 				sf_error_str (0, errbuf, sizeof (errbuf) - 1);
 				error << string_compose(_("SndFileSource: @ %1 could not read %2 within %3 (%4) (len = %5, ret was %6)"), start, file_cnt, _name.val().substr (1), errbuf, _length, ret) << endl;
 			}
+			if (_gain != 1.f) {
+				for (framecnt_t i = 0; i < ret; ++i) {
+					dst[i] *= _gain;
+				}
+			}
 			return ret;
 		}
 	}
@@ -537,9 +542,16 @@ SndFileSource::read_unlocked (Sample *dst, framepos_t start, framecnt_t cnt) con
 
 	/* stride through the interleaved data */
 
-	for (framecnt_t n = 0; n < nread; ++n) {
-		dst[n] = *ptr;
-		ptr += _info.channels;
+	if (_gain != 1.f) {
+		for (framecnt_t n = 0; n < nread; ++n) {
+			dst[n] = *ptr * _gain;
+			ptr += _info.channels;
+		}
+	} else {
+		for (framecnt_t n = 0; n < nread; ++n) {
+			dst[n] = *ptr;
+			ptr += _info.channels;
+		}
 	}
 
 	return nread;