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/*
* 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.
*/
#include "common_audio/wav_file.h"
#include <errno.h>
#include <algorithm>
#include <array>
#include <cstdio>
#include <type_traits>
#include <utility>
#include "common_audio/include/audio_util.h"
#include "rtc_base/checks.h"
#include "rtc_base/system/arch.h"
namespace webrtc {
namespace {
static_assert(std::is_trivially_destructible<WavFormat>::value, "");
// Checks whether the format is supported or not.
bool FormatSupported(WavFormat format) {
// Only PCM and IEEE Float formats are supported.
return format == WavFormat::kWavFormatPcm ||
format == WavFormat::kWavFormatIeeeFloat;
}
// Doesn't take ownership of the file handle and won't close it.
class WavHeaderFileReader : public WavHeaderReader {
public:
explicit WavHeaderFileReader(FileWrapper* file) : file_(file) {}
WavHeaderFileReader(const WavHeaderFileReader&) = delete;
WavHeaderFileReader& operator=(const WavHeaderFileReader&) = delete;
size_t Read(void* buf, size_t num_bytes) override {
size_t count = file_->Read(buf, num_bytes);
pos_ += count;
return count;
}
bool SeekForward(uint32_t num_bytes) override {
bool success = file_->SeekRelative(num_bytes);
if (success) {
pos_ += num_bytes;
}
return success;
}
int64_t GetPosition() override { return pos_; }
private:
FileWrapper* file_;
int64_t pos_ = 0;
};
constexpr size_t kMaxChunksize = 4096;
} // namespace
WavReader::WavReader(absl::string_view filename)
: WavReader(FileWrapper::OpenReadOnly(filename)) {}
WavReader::WavReader(FileWrapper file) : file_(std::move(file)) {
RTC_CHECK(file_.is_open())
<< "Invalid file. Could not create file handle for wav file.";
WavHeaderFileReader readable(&file_);
size_t bytes_per_sample;
RTC_CHECK(ReadWavHeader(&readable, &num_channels_, &sample_rate_, &format_,
&bytes_per_sample, &num_samples_in_file_,
&data_start_pos_));
num_unread_samples_ = num_samples_in_file_;
RTC_CHECK(FormatSupported(format_)) << "Non-implemented wav-format";
}
void WavReader::Reset() {
RTC_CHECK(file_.SeekTo(data_start_pos_))
<< "Failed to set position in the file to WAV data start position";
num_unread_samples_ = num_samples_in_file_;
}
size_t WavReader::ReadSamples(const size_t num_samples,
int16_t* const samples) {
#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
#error "Need to convert samples to big-endian when reading from WAV file"
#endif
size_t num_samples_left_to_read = num_samples;
size_t next_chunk_start = 0;
while (num_samples_left_to_read > 0 && num_unread_samples_ > 0) {
const size_t chunk_size = std::min(
std::min(kMaxChunksize, num_samples_left_to_read), num_unread_samples_);
size_t num_bytes_read;
size_t num_samples_read;
if (format_ == WavFormat::kWavFormatIeeeFloat) {
std::array<float, kMaxChunksize> samples_to_convert;
num_bytes_read = file_.Read(samples_to_convert.data(),
chunk_size * sizeof(samples_to_convert[0]));
num_samples_read = num_bytes_read / sizeof(samples_to_convert[0]);
for (size_t j = 0; j < num_samples_read; ++j) {
samples[next_chunk_start + j] = FloatToS16(samples_to_convert[j]);
}
} else {
RTC_CHECK_EQ(format_, WavFormat::kWavFormatPcm);
num_bytes_read = file_.Read(&samples[next_chunk_start],
chunk_size * sizeof(samples[0]));
num_samples_read = num_bytes_read / sizeof(samples[0]);
}
RTC_CHECK(num_samples_read == 0 || (num_bytes_read % num_samples_read) == 0)
<< "Corrupt file: file ended in the middle of a sample.";
RTC_CHECK(num_samples_read == chunk_size || file_.ReadEof())
<< "Corrupt file: payload size does not match header.";
next_chunk_start += num_samples_read;
num_unread_samples_ -= num_samples_read;
num_samples_left_to_read -= num_samples_read;
}
return num_samples - num_samples_left_to_read;
}
size_t WavReader::ReadSamples(const size_t num_samples, float* const samples) {
#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
#error "Need to convert samples to big-endian when reading from WAV file"
#endif
size_t num_samples_left_to_read = num_samples;
size_t next_chunk_start = 0;
while (num_samples_left_to_read > 0 && num_unread_samples_ > 0) {
const size_t chunk_size = std::min(
std::min(kMaxChunksize, num_samples_left_to_read), num_unread_samples_);
size_t num_bytes_read;
size_t num_samples_read;
if (format_ == WavFormat::kWavFormatPcm) {
std::array<int16_t, kMaxChunksize> samples_to_convert;
num_bytes_read = file_.Read(samples_to_convert.data(),
chunk_size * sizeof(samples_to_convert[0]));
num_samples_read = num_bytes_read / sizeof(samples_to_convert[0]);
for (size_t j = 0; j < num_samples_read; ++j) {
samples[next_chunk_start + j] =
static_cast<float>(samples_to_convert[j]);
}
} else {
RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
num_bytes_read = file_.Read(&samples[next_chunk_start],
chunk_size * sizeof(samples[0]));
num_samples_read = num_bytes_read / sizeof(samples[0]);
for (size_t j = 0; j < num_samples_read; ++j) {
samples[next_chunk_start + j] =
FloatToFloatS16(samples[next_chunk_start + j]);
}
}
RTC_CHECK(num_samples_read == 0 || (num_bytes_read % num_samples_read) == 0)
<< "Corrupt file: file ended in the middle of a sample.";
RTC_CHECK(num_samples_read == chunk_size || file_.ReadEof())
<< "Corrupt file: payload size does not match header.";
next_chunk_start += num_samples_read;
num_unread_samples_ -= num_samples_read;
num_samples_left_to_read -= num_samples_read;
}
return num_samples - num_samples_left_to_read;
}
void WavReader::Close() {
file_.Close();
}
WavWriter::WavWriter(absl::string_view filename,
int sample_rate,
size_t num_channels,
SampleFormat sample_format)
// Unlike plain fopen, OpenWriteOnly takes care of filename utf8 ->
// wchar conversion on windows.
: WavWriter(FileWrapper::OpenWriteOnly(filename),
sample_rate,
num_channels,
sample_format) {}
WavWriter::WavWriter(FileWrapper file,
int sample_rate,
size_t num_channels,
SampleFormat sample_format)
: sample_rate_(sample_rate),
num_channels_(num_channels),
num_samples_written_(0),
format_(sample_format == SampleFormat::kInt16
? WavFormat::kWavFormatPcm
: WavFormat::kWavFormatIeeeFloat),
file_(std::move(file)) {
// Handle errors from the OpenWriteOnly call in above constructor.
RTC_CHECK(file_.is_open()) << "Invalid file. Could not create wav file.";
RTC_CHECK(CheckWavParameters(num_channels_, sample_rate_, format_,
num_samples_written_));
// Write a blank placeholder header, since we need to know the total number
// of samples before we can fill in the real data.
static const uint8_t blank_header[MaxWavHeaderSize()] = {0};
RTC_CHECK(file_.Write(blank_header, WavHeaderSize(format_)));
}
void WavWriter::WriteSamples(const int16_t* samples, size_t num_samples) {
#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
#error "Need to convert samples to little-endian when writing to WAV file"
#endif
for (size_t i = 0; i < num_samples; i += kMaxChunksize) {
const size_t num_remaining_samples = num_samples - i;
const size_t num_samples_to_write =
std::min(kMaxChunksize, num_remaining_samples);
if (format_ == WavFormat::kWavFormatPcm) {
RTC_CHECK(
file_.Write(&samples[i], num_samples_to_write * sizeof(samples[0])));
} else {
RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
std::array<float, kMaxChunksize> converted_samples;
for (size_t j = 0; j < num_samples_to_write; ++j) {
converted_samples[j] = S16ToFloat(samples[i + j]);
}
RTC_CHECK(
file_.Write(converted_samples.data(),
num_samples_to_write * sizeof(converted_samples[0])));
}
num_samples_written_ += num_samples_to_write;
RTC_CHECK_GE(num_samples_written_,
num_samples_to_write); // detect size_t overflow
}
}
void WavWriter::WriteSamples(const float* samples, size_t num_samples) {
#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
#error "Need to convert samples to little-endian when writing to WAV file"
#endif
for (size_t i = 0; i < num_samples; i += kMaxChunksize) {
const size_t num_remaining_samples = num_samples - i;
const size_t num_samples_to_write =
std::min(kMaxChunksize, num_remaining_samples);
if (format_ == WavFormat::kWavFormatPcm) {
std::array<int16_t, kMaxChunksize> converted_samples;
for (size_t j = 0; j < num_samples_to_write; ++j) {
converted_samples[j] = FloatS16ToS16(samples[i + j]);
}
RTC_CHECK(
file_.Write(converted_samples.data(),
num_samples_to_write * sizeof(converted_samples[0])));
} else {
RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
std::array<float, kMaxChunksize> converted_samples;
for (size_t j = 0; j < num_samples_to_write; ++j) {
converted_samples[j] = FloatS16ToFloat(samples[i + j]);
}
RTC_CHECK(
file_.Write(converted_samples.data(),
num_samples_to_write * sizeof(converted_samples[0])));
}
num_samples_written_ += num_samples_to_write;
RTC_CHECK(num_samples_written_ >=
num_samples_to_write); // detect size_t overflow
}
}
void WavWriter::Close() {
RTC_CHECK(file_.Rewind());
std::array<uint8_t, MaxWavHeaderSize()> header;
size_t header_size;
WriteWavHeader(num_channels_, sample_rate_, format_, num_samples_written_,
header.data(), &header_size);
RTC_CHECK(file_.Write(header.data(), header_size));
RTC_CHECK(file_.Close());
}
} // namespace webrtc