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author | andrew@webrtc.org <andrew@webrtc.org> | 2014-10-31 21:51:03 +0000 |
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committer | andrew@webrtc.org <andrew@webrtc.org> | 2014-10-31 21:51:03 +0000 |
commit | 46c5634b0a617aa58e5ee12729709776cb73f26b (patch) | |
tree | ccbb26ca0460fe87258de6ddb2e14fd62eebc02f /common_audio/wav_file.h | |
parent | 796056b8fff85d6e85e3717d3598684fc9e893f0 (diff) | |
download | webrtc-46c5634b0a617aa58e5ee12729709776cb73f26b.tar.gz |
Add a WavReader counterpart to WavWriter.
Don't bother with a C interface as we currently have no need to call
this from C code. The first use will be in the audioproc tool.
R=kwiberg@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/30829004
git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@7585 4adac7df-926f-26a2-2b94-8c16560cd09d
Diffstat (limited to 'common_audio/wav_file.h')
-rw-r--r-- | common_audio/wav_file.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/common_audio/wav_file.h b/common_audio/wav_file.h new file mode 100644 index 00000000..c6c5d6b7 --- /dev/null +++ b/common_audio/wav_file.h @@ -0,0 +1,98 @@ +/* + * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef WEBRTC_COMMON_AUDIO_WAV_FILE_H_ +#define WEBRTC_COMMON_AUDIO_WAV_FILE_H_ + +#ifdef __cplusplus + +#include <stdint.h> +#include <cstddef> +#include <string> + +namespace webrtc { + +// Simple C++ class for writing 16-bit PCM WAV files. All error handling is +// by calls to CHECK(), making it unsuitable for anything but debug code. +class WavWriter { + public: + // Open a new WAV file for writing. + WavWriter(const std::string& filename, int sample_rate, int num_channels); + + // Close the WAV file, after writing its header. + ~WavWriter(); + + // Write additional samples to the file. Each sample is in the range + // [-32768,32767], and there must be the previously specified number of + // interleaved channels. + void WriteSamples(const float* samples, size_t num_samples); + void WriteSamples(const int16_t* samples, size_t num_samples); + + int sample_rate() const { return sample_rate_; } + int num_channels() const { return num_channels_; } + uint32_t num_samples() const { return num_samples_; } + + private: + void Close(); + const int sample_rate_; + const int num_channels_; + uint32_t num_samples_; // Total number of samples written to file. + FILE* file_handle_; // Output file, owned by this class +}; + +// Follows the conventions of WavWriter. +class WavReader { + public: + // Opens an existing WAV file for reading. + explicit WavReader(const std::string& filename); + + // Close the WAV file. + ~WavReader(); + + // Returns the number of samples read. If this is less than requested, + // verifies that the end of the file was reached. + size_t ReadSamples(size_t num_samples, float* samples); + size_t ReadSamples(size_t num_samples, int16_t* samples); + + int sample_rate() const { return sample_rate_; } + int num_channels() const { return num_channels_; } + uint32_t num_samples() const { return num_samples_; } + + private: + void Close(); + int sample_rate_; + int num_channels_; + uint32_t num_samples_; // Total number of samples in the file. + FILE* file_handle_; // Input file, owned by this class. +}; + +} // namespace webrtc + +extern "C" { +#endif // __cplusplus + +// C wrappers for the WavWriter class. +typedef struct rtc_WavWriter rtc_WavWriter; +rtc_WavWriter* rtc_WavOpen(const char* filename, + int sample_rate, + int num_channels); +void rtc_WavClose(rtc_WavWriter* wf); +void rtc_WavWriteSamples(rtc_WavWriter* wf, + const float* samples, + size_t num_samples); +int rtc_WavSampleRate(const rtc_WavWriter* wf); +int rtc_WavNumChannels(const rtc_WavWriter* wf); +uint32_t rtc_WavNumSamples(const rtc_WavWriter* wf); + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // WEBRTC_COMMON_AUDIO_WAV_FILE_H_ |