1 files changed, 120 insertions, 0 deletions
diff --git a/src/lib/sndfile_decoder.cc b/src/lib/sndfile_decoder.cc
new file mode 100644
index 000000000..1fc1ecaf2
--- /dev/null
+++ b/src/lib/sndfile_decoder.cc
@@ -0,0 +1,120 @@
+/*
+    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <iostream>
+#include <sndfile.h>
+#include "sndfile_content.h"
+#include "sndfile_decoder.h"
+#include "film.h"
+#include "exceptions.h"
+#include "audio_buffers.h"
+
+#include "i18n.h"
+
+using std::vector;
+using std::string;
+using std::min;
+using std::cout;
+using boost::shared_ptr;
+
+SndfileDecoder::SndfileDecoder (shared_ptr<const Film> f, shared_ptr<const SndfileContent> c)
+	: Decoder (f)
+	, AudioDecoder (f)
+	, _sndfile_content (c)
+	, _deinterleave_buffer (0)
+{
+	_info.format = 0;
+	_sndfile = sf_open (_sndfile_content->path().string().c_str(), SFM_READ, &_info);
+	if (!_sndfile) {
+		throw DecodeError (_("could not open audio file for reading"));
+	}
+
+	_done = 0;
+	_remaining = _info.frames;
+}
+
+SndfileDecoder::~SndfileDecoder ()
+{
+	sf_close (_sndfile);
+	delete[] _deinterleave_buffer;
+}
+
+void
+SndfileDecoder::pass ()
+{
+	/* Do things in half second blocks as I think there may be limits
+	   to what FFmpeg (and in particular the resampler) can cope with.
+	*/
+	sf_count_t const block = _sndfile_content->content_audio_frame_rate() / 2;
+	sf_count_t const this_time = min (block, _remaining);
+
+	int const channels = _sndfile_content->audio_channels ();
+	
+	shared_ptr<AudioBuffers> data (new AudioBuffers (channels, this_time));
+
+	if (_sndfile_content->audio_channels() == 1) {
+		/* No de-interleaving required */
+		sf_read_float (_sndfile, data->data(0), this_time);
+	} else {
+		/* Deinterleave */
+		if (!_deinterleave_buffer) {
+			_deinterleave_buffer = new float[block * channels];
+		}
+		sf_readf_float (_sndfile, _deinterleave_buffer, this_time);
+		vector<float*> out_ptr (channels);
+		for (int i = 0; i < channels; ++i) {
+			out_ptr[i] = data->data(i);
+		}
+		float* in_ptr = _deinterleave_buffer;
+		for (int i = 0; i < this_time; ++i) {
+			for (int j = 0; j < channels; ++j) {
+				*out_ptr[j]++ = *in_ptr++;
+			}
+		}
+	}
+		
+	data->set_frames (this_time);
+	audio (data, _done);
+	_done += this_time;
+	_remaining -= this_time;
+}
+
+int
+SndfileDecoder::audio_channels () const
+{
+	return _info.channels;
+}
+
+AudioContent::Frame
+SndfileDecoder::audio_length () const
+{
+	return _info.frames;
+}
+
+int
+SndfileDecoder::audio_frame_rate () const
+{
+	return _info.samplerate;
+}
+
+bool
+SndfileDecoder::done () const
+{
+	return _audio_position >= _sndfile_content->audio_length ();
+}