+/** @param dB gain in dB */
+void
+AudioBuffers::apply_gain (float dB)
+{
+ float const linear = pow (10, dB / 20);
+
+ for (int i = 0; i < _channels; ++i) {
+ for (int j = 0; j < _frames; ++j) {
+ _data[i][j] *= linear;
+ }
+ }
+}
+
+/** @param c Channel index.
+ * @return AudioBuffers object containing only channel `c' from this AudioBuffers.
+ */
+shared_ptr<AudioBuffers>
+AudioBuffers::channel (int c) const
+{
+ shared_ptr<AudioBuffers> o (new AudioBuffers (1, frames ()));
+ o->copy_channel_from (this, c, 0);
+ return o;
+}
+
+void
+AudioBuffers::copy_channel_from (AudioBuffers const * from, int from_channel, int to_channel)
+{
+ DCPOMATIC_ASSERT (from->frames() == frames());
+ memcpy (data(to_channel), from->data(from_channel), frames() * sizeof (float));
+}
+
+shared_ptr<AudioBuffers>
+AudioBuffers::clone () const
+{
+ shared_ptr<AudioBuffers> b (new AudioBuffers (channels (), frames ()));
+ b->copy_from (this, frames (), 0, 0);
+ return b;
+}