Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / lib / io / gr_wavfile_source.h

diff --git a/gnuradio-core/src/lib/io/gr_wavfile_source.h b/gnuradio-core/src/lib/io/gr_wavfile_source.h
new file mode 100644 (file)
index 0000000..0c663f0
--- /dev/null
+++ b/gnuradio-core/src/lib/io/gr_wavfile_source.h
@@ -0,0 +1,93 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_WAVFILE_SOURCE_H
+#define INCLUDED_GR_WAVFILE_SOURCE_H
+
+#include <gr_sync_block.h>
+
+class gr_wavfile_source;
+typedef boost::shared_ptr<gr_wavfile_source> gr_wavfile_source_sptr;
+
+gr_wavfile_source_sptr
+gr_make_wavfile_source (const char *filename, bool repeat = false);
+
+/*!
+ * \brief Read stream from a Microsoft PCM (.wav) file, output floats
+ *
+ * Unless otherwise called, values are within [-1;1].
+ * Check gr_make_wavfile_source() for extra info.
+ *
+ * \ingroup source_blk
+ */
+
+class gr_wavfile_source : public gr_sync_block
+{
+private:
+  friend gr_wavfile_source_sptr gr_make_wavfile_source (const char *filename,
+                                                             bool repeat);
+  gr_wavfile_source(const char *filename, bool repeat);
+
+  FILE *d_fp;
+  bool d_repeat;
+  
+  unsigned d_sample_rate;
+  int d_nchans;
+  int d_bytes_per_sample;
+  int d_first_sample_pos;
+  unsigned d_samples_per_chan;
+  unsigned d_sample_idx;
+  int d_normalize_shift;
+  int d_normalize_fac;
+  
+  /*!
+   * \brief Convert an integer sample value to a float value within [-1;1]
+   */
+  float convert_to_float(short int sample);
+
+public:
+  ~gr_wavfile_source ();
+  
+  int work(int noutput_items,
+          gr_vector_const_void_star &input_items,
+          gr_vector_void_star &output_items);
+
+  /*!
+   * \brief Read the sample rate as specified in the wav file header
+   */
+  unsigned int sample_rate() const { return d_sample_rate; };
+
+  /*!
+   * \brief Return the number of bits per sample as specified in the wav
+   * file header. Only 8 or 16 bit are supported here.
+   */
+  int bits_per_sample() const { return d_bytes_per_sample * 8; };
+  
+  /*!
+   * \brief Return the number of channels in the wav file as specified in
+   * the wav file header. This is also the max number of outputs you can
+   * have.
+   */
+  int channels() const { return d_nchans; };
+};
+
+#endif /* INCLUDED_GR_WAVFILE_SOURCE_H */