+ _channel = chn;
+
+ init_sndfile ();
+
+ assert (Glib::file_test (_path, Glib::FILE_TEST_EXISTS));
+ existence_check ();
+
+ if (open()) {
+ throw failed_constructor ();
+ }
+}
+
+/** Constructor to losslessly compress existing source to flac */
+SndFileSource::SndFileSource (Session& s, const AudioFileSource& other, const string& path, bool use16bits, Progress* progress)
+ : Source(s, DataType::AUDIO, path, Flag ((other.flags () | default_writable_flags | NoPeakFile) & ~RF64_RIFF))
+ , AudioFileSource (s, path, "", Flag ((other.flags () | default_writable_flags | NoPeakFile) & ~RF64_RIFF), /*unused*/ FormatFloat, /*unused*/ WAVE64)
+ , _sndfile (0)
+ , _broadcast_info (0)
+ , _capture_start (false)
+ , _capture_end (false)
+ , file_pos (0)
+ , xfade_buf (0)
+{
+ if (other.readable_length () == 0) {
+ throw failed_constructor();
+ }
+
+ assert (!Glib::file_test (_path, Glib::FILE_TEST_EXISTS));
+
+ _channel = 0;
+ init_sndfile ();
+
+ _file_is_new = true;
+
+ _info.channels = 1;
+ _info.samplerate = other.sample_rate ();
+ _info.format = SF_FORMAT_FLAC | (use16bits ? SF_FORMAT_PCM_16 : SF_FORMAT_PCM_24);
+
+ /* flac is either read or write -- never both,
+ * so we need to special-case ::open () */
+#ifdef PLATFORM_WINDOWS
+ int fd = g_open (_path.c_str(), O_CREAT | O_RDWR, 0644);
+#else
+ int fd = ::open (_path.c_str(), O_CREAT | O_RDWR, 0644);
+#endif
+ if (fd == -1) {
+ throw failed_constructor();
+ }
+
+ _sndfile = sf_open_fd (fd, SFM_WRITE, &_info, true);