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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 <cstdio>
#include <type_traits>
#include <utility>
#include "common_audio/include/audio_util.h"
#include "common_audio/wav_header.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/system/arch.h"
namespace webrtc {
namespace {
// We write 16-bit PCM WAV files.
constexpr WavFormat kWavFormat = kWavFormatPcm;
static_assert(std::is_trivially_destructible<WavFormat>::value, "");
constexpr size_t kBytesPerSample = 2;
// Doesn't take ownership of the file handle and won't close it.
class ReadableWavFile : public ReadableWav {
public:
explicit ReadableWavFile(FILE* file) : file_(file) {}
ReadableWavFile(const ReadableWavFile&) = delete;
ReadableWavFile& operator=(const ReadableWavFile&) = delete;
size_t Read(void* buf, size_t num_bytes) override {
return fread(buf, 1, num_bytes, file_);
}
bool Eof() const override { return feof(file_) != 0; }
bool SeekForward(uint32_t num_bytes) override {
return fseek(file_, num_bytes, SEEK_CUR) == 0;
}
private:
FILE* file_;
};
} // namespace
WavReader::WavReader(const std::string& filename)
: WavReader(rtc::OpenPlatformFileReadOnly(filename)) {}
WavReader::WavReader(rtc::PlatformFile file) {
RTC_CHECK_NE(file, rtc::kInvalidPlatformFileValue)
<< "Invalid file. Could not create file handle for wav file.";
file_handle_ = rtc::FdopenPlatformFile(file, "rb");
if (!file_handle_) {
RTC_LOG(LS_ERROR) << "Could not open wav file for reading: " << errno;
// Even though we failed to open a FILE*, the file is still open
// and needs to be closed.
if (!rtc::ClosePlatformFile(file)) {
RTC_LOG(LS_ERROR) << "Can't close file.";
}
FATAL() << "Could not open wav file for reading.";
}
ReadableWavFile readable(file_handle_);
WavFormat format;
size_t bytes_per_sample;
RTC_CHECK(ReadWavHeader(&readable, &num_channels_, &sample_rate_, &format,
&bytes_per_sample, &num_samples_));
num_samples_remaining_ = num_samples_;
RTC_CHECK_EQ(kWavFormat, format);
RTC_CHECK_EQ(kBytesPerSample, bytes_per_sample);
RTC_CHECK_EQ(0, fgetpos(file_handle_, &data_start_pos_))
<< "Failed to get WAV data position from file";
}
WavReader::~WavReader() {
Close();
}
void WavReader::Reset() {
RTC_CHECK_EQ(0, fsetpos(file_handle_, &data_start_pos_))
<< "Failed to set position in the file to WAV data start position";
num_samples_remaining_ = num_samples_;
}
int WavReader::sample_rate() const {
return sample_rate_;
}
size_t WavReader::num_channels() const {
return num_channels_;
}
size_t WavReader::num_samples() const {
return num_samples_;
}
size_t WavReader::ReadSamples(size_t num_samples, int16_t* samples) {
#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
#error "Need to convert samples to big-endian when reading from WAV file"
#endif
// There could be metadata after the audio; ensure we don't read it.
num_samples = std::min(num_samples, num_samples_remaining_);
const size_t read =
fread(samples, sizeof(*samples), num_samples, file_handle_);
// If we didn't read what was requested, ensure we've reached the EOF.
RTC_CHECK(read == num_samples || feof(file_handle_));
RTC_CHECK_LE(read, num_samples_remaining_);
num_samples_remaining_ -= read;
return read;
}
size_t WavReader::ReadSamples(size_t num_samples, float* samples) {
static const size_t kChunksize = 4096 / sizeof(uint16_t);
size_t read = 0;
for (size_t i = 0; i < num_samples; i += kChunksize) {
int16_t isamples[kChunksize];
size_t chunk = std::min(kChunksize, num_samples - i);
chunk = ReadSamples(chunk, isamples);
for (size_t j = 0; j < chunk; ++j)
samples[i + j] = isamples[j];
read += chunk;
}
return read;
}
void WavReader::Close() {
RTC_CHECK_EQ(0, fclose(file_handle_));
file_handle_ = nullptr;
}
WavWriter::WavWriter(const std::string& filename,
int sample_rate,
size_t num_channels)
// Unlike plain fopen, CreatePlatformFile takes care of filename utf8 ->
// wchar conversion on windows.
: WavWriter(FileWrapper::OpenWriteOnly(filename),
sample_rate,
num_channels) {}
WavWriter::WavWriter(FileWrapper file, int sample_rate, size_t num_channels)
: sample_rate_(sample_rate),
num_channels_(num_channels),
num_samples_(0),
file_(std::move(file)) {
// Handle errors from the CreatePlatformFile call in above constructor.
RTC_CHECK(file_.is_open()) << "Invalid file. Could not create wav file.";
RTC_CHECK(CheckWavParameters(num_channels_, sample_rate_, kWavFormat,
kBytesPerSample, num_samples_));
// 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[kWavHeaderSize] = {0};
RTC_CHECK(file_.Write(blank_header, kWavHeaderSize));
}
WavWriter::~WavWriter() {
Close();
}
int WavWriter::sample_rate() const {
return sample_rate_;
}
size_t WavWriter::num_channels() const {
return num_channels_;
}
size_t WavWriter::num_samples() const {
return num_samples_;
}
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
RTC_CHECK(file_.Write(samples, sizeof(*samples) * num_samples));
num_samples_ += num_samples;
RTC_CHECK(num_samples_ >= num_samples); // detect size_t overflow
}
void WavWriter::WriteSamples(const float* samples, size_t num_samples) {
static const size_t kChunksize = 4096 / sizeof(uint16_t);
for (size_t i = 0; i < num_samples; i += kChunksize) {
int16_t isamples[kChunksize];
const size_t chunk = std::min(kChunksize, num_samples - i);
FloatS16ToS16(samples + i, chunk, isamples);
WriteSamples(isamples, chunk);
}
}
void WavWriter::Close() {
RTC_CHECK(file_.Rewind());
uint8_t header[kWavHeaderSize];
WriteWavHeader(header, num_channels_, sample_rate_, kWavFormat,
kBytesPerSample, num_samples_);
RTC_CHECK(file_.Write(header, kWavHeaderSize));
RTC_CHECK(file_.Close());
}
} // namespace webrtc
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