GNU Radio 3.5.3.2 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2004,2008 Free Software Foundation, Inc. 00004 * 00005 * This file is part of GNU Radio 00006 * 00007 * GNU Radio is free software; you can redistribute it and/or modify 00008 * it under the terms of the GNU General Public License as published by 00009 * the Free Software Foundation; either version 3, or (at your option) 00010 * any later version. 00011 * 00012 * GNU Radio is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 * GNU General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU General Public License 00018 * along with GNU Radio; see the file COPYING. If not, write to 00019 * the Free Software Foundation, Inc., 51 Franklin Street, 00020 * Boston, MA 02110-1301, USA. 00021 */ 00022 00023 #ifndef INCLUDED_GR_WAVFILE_SOURCE_H 00024 #define INCLUDED_GR_WAVFILE_SOURCE_H 00025 00026 #include <gr_core_api.h> 00027 #include <gr_sync_block.h> 00028 #include <cstdio> // for FILE 00029 00030 class gr_wavfile_source; 00031 typedef boost::shared_ptr<gr_wavfile_source> gr_wavfile_source_sptr; 00032 00033 GR_CORE_API gr_wavfile_source_sptr 00034 gr_make_wavfile_source (const char *filename, bool repeat = false); 00035 00036 /*! 00037 * \brief Read stream from a Microsoft PCM (.wav) file, output floats 00038 * 00039 * Unless otherwise called, values are within [-1;1]. 00040 * Check gr_make_wavfile_source() for extra info. 00041 * 00042 * \ingroup source_blk 00043 */ 00044 00045 class GR_CORE_API gr_wavfile_source : public gr_sync_block 00046 { 00047 private: 00048 friend GR_CORE_API gr_wavfile_source_sptr gr_make_wavfile_source (const char *filename, 00049 bool repeat); 00050 gr_wavfile_source(const char *filename, bool repeat); 00051 00052 FILE *d_fp; 00053 bool d_repeat; 00054 00055 unsigned d_sample_rate; 00056 int d_nchans; 00057 int d_bytes_per_sample; 00058 int d_first_sample_pos; 00059 unsigned d_samples_per_chan; 00060 unsigned d_sample_idx; 00061 int d_normalize_shift; 00062 int d_normalize_fac; 00063 00064 /*! 00065 * \brief Convert an integer sample value to a float value within [-1;1] 00066 */ 00067 float convert_to_float(short int sample); 00068 00069 public: 00070 ~gr_wavfile_source (); 00071 00072 int work(int noutput_items, 00073 gr_vector_const_void_star &input_items, 00074 gr_vector_void_star &output_items); 00075 00076 /*! 00077 * \brief Read the sample rate as specified in the wav file header 00078 */ 00079 unsigned int sample_rate() const { return d_sample_rate; }; 00080 00081 /*! 00082 * \brief Return the number of bits per sample as specified in the wav 00083 * file header. Only 8 or 16 bit are supported here. 00084 */ 00085 int bits_per_sample() const { return d_bytes_per_sample * 8; }; 00086 00087 /*! 00088 * \brief Return the number of channels in the wav file as specified in 00089 * the wav file header. This is also the max number of outputs you can 00090 * have. 00091 */ 00092 int channels() const { return d_nchans; }; 00093 }; 00094 00095 #endif /* INCLUDED_GR_WAVFILE_SOURCE_H */