291 lines
10 KiB
C++
291 lines
10 KiB
C++
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/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "common_audio/wav_file.h"
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#include <errno.h>
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#include <algorithm>
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#include <array>
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#include <cstdio>
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#include <type_traits>
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#include <utility>
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#include "common_audio/include/audio_util.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/system/arch.h"
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namespace webrtc {
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namespace {
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static_assert(std::is_trivially_destructible<WavFormat>::value, "");
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// Checks whether the format is supported or not.
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bool FormatSupported(WavFormat format) {
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// Only PCM and IEEE Float formats are supported.
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return format == WavFormat::kWavFormatPcm ||
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format == WavFormat::kWavFormatIeeeFloat;
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}
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// Doesn't take ownership of the file handle and won't close it.
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class WavHeaderFileReader : public WavHeaderReader {
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public:
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explicit WavHeaderFileReader(FileWrapper* file) : file_(file) {}
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WavHeaderFileReader(const WavHeaderFileReader&) = delete;
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WavHeaderFileReader& operator=(const WavHeaderFileReader&) = delete;
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size_t Read(void* buf, size_t num_bytes) override {
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size_t count = file_->Read(buf, num_bytes);
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pos_ += count;
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return count;
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}
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bool SeekForward(uint32_t num_bytes) override {
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bool success = file_->SeekRelative(num_bytes);
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if (success) {
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pos_ += num_bytes;
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}
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return success;
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}
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int64_t GetPosition() override { return pos_; }
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private:
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FileWrapper* file_;
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int64_t pos_ = 0;
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};
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constexpr size_t kMaxChunksize = 4096;
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} // namespace
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WavReader::WavReader(absl::string_view filename)
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: WavReader(FileWrapper::OpenReadOnly(filename)) {}
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WavReader::WavReader(FileWrapper file) : file_(std::move(file)) {
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RTC_CHECK(file_.is_open())
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<< "Invalid file. Could not create file handle for wav file.";
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WavHeaderFileReader readable(&file_);
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size_t bytes_per_sample;
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RTC_CHECK(ReadWavHeader(&readable, &num_channels_, &sample_rate_, &format_,
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&bytes_per_sample, &num_samples_in_file_,
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&data_start_pos_));
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num_unread_samples_ = num_samples_in_file_;
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RTC_CHECK(FormatSupported(format_)) << "Non-implemented wav-format";
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}
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void WavReader::Reset() {
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RTC_CHECK(file_.SeekTo(data_start_pos_))
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<< "Failed to set position in the file to WAV data start position";
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num_unread_samples_ = num_samples_in_file_;
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}
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size_t WavReader::ReadSamples(const size_t num_samples,
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int16_t* const samples) {
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#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
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#error "Need to convert samples to big-endian when reading from WAV file"
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#endif
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size_t num_samples_left_to_read = num_samples;
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size_t next_chunk_start = 0;
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while (num_samples_left_to_read > 0 && num_unread_samples_ > 0) {
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const size_t chunk_size = std::min(
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std::min(kMaxChunksize, num_samples_left_to_read), num_unread_samples_);
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size_t num_bytes_read;
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size_t num_samples_read;
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if (format_ == WavFormat::kWavFormatIeeeFloat) {
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std::array<float, kMaxChunksize> samples_to_convert;
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num_bytes_read = file_.Read(samples_to_convert.data(),
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chunk_size * sizeof(samples_to_convert[0]));
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num_samples_read = num_bytes_read / sizeof(samples_to_convert[0]);
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for (size_t j = 0; j < num_samples_read; ++j) {
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samples[next_chunk_start + j] = FloatToS16(samples_to_convert[j]);
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}
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} else {
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RTC_CHECK_EQ(format_, WavFormat::kWavFormatPcm);
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num_bytes_read = file_.Read(&samples[next_chunk_start],
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chunk_size * sizeof(samples[0]));
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num_samples_read = num_bytes_read / sizeof(samples[0]);
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}
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RTC_CHECK(num_samples_read == 0 || (num_bytes_read % num_samples_read) == 0)
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<< "Corrupt file: file ended in the middle of a sample.";
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RTC_CHECK(num_samples_read == chunk_size || file_.ReadEof())
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<< "Corrupt file: payload size does not match header.";
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next_chunk_start += num_samples_read;
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num_unread_samples_ -= num_samples_read;
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num_samples_left_to_read -= num_samples_read;
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}
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return num_samples - num_samples_left_to_read;
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}
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size_t WavReader::ReadSamples(const size_t num_samples, float* const samples) {
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#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
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#error "Need to convert samples to big-endian when reading from WAV file"
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#endif
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size_t num_samples_left_to_read = num_samples;
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size_t next_chunk_start = 0;
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while (num_samples_left_to_read > 0 && num_unread_samples_ > 0) {
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const size_t chunk_size = std::min(
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std::min(kMaxChunksize, num_samples_left_to_read), num_unread_samples_);
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size_t num_bytes_read;
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size_t num_samples_read;
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if (format_ == WavFormat::kWavFormatPcm) {
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std::array<int16_t, kMaxChunksize> samples_to_convert;
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num_bytes_read = file_.Read(samples_to_convert.data(),
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chunk_size * sizeof(samples_to_convert[0]));
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num_samples_read = num_bytes_read / sizeof(samples_to_convert[0]);
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for (size_t j = 0; j < num_samples_read; ++j) {
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samples[next_chunk_start + j] =
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static_cast<float>(samples_to_convert[j]);
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}
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} else {
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RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
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num_bytes_read = file_.Read(&samples[next_chunk_start],
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chunk_size * sizeof(samples[0]));
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num_samples_read = num_bytes_read / sizeof(samples[0]);
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for (size_t j = 0; j < num_samples_read; ++j) {
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samples[next_chunk_start + j] =
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FloatToFloatS16(samples[next_chunk_start + j]);
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}
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}
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RTC_CHECK(num_samples_read == 0 || (num_bytes_read % num_samples_read) == 0)
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<< "Corrupt file: file ended in the middle of a sample.";
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RTC_CHECK(num_samples_read == chunk_size || file_.ReadEof())
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<< "Corrupt file: payload size does not match header.";
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next_chunk_start += num_samples_read;
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num_unread_samples_ -= num_samples_read;
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num_samples_left_to_read -= num_samples_read;
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}
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return num_samples - num_samples_left_to_read;
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}
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void WavReader::Close() {
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file_.Close();
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}
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WavWriter::WavWriter(absl::string_view filename,
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int sample_rate,
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size_t num_channels,
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SampleFormat sample_format)
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// Unlike plain fopen, OpenWriteOnly takes care of filename utf8 ->
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// wchar conversion on windows.
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: WavWriter(FileWrapper::OpenWriteOnly(filename),
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sample_rate,
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num_channels,
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sample_format) {}
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WavWriter::WavWriter(FileWrapper file,
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int sample_rate,
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size_t num_channels,
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SampleFormat sample_format)
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: sample_rate_(sample_rate),
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num_channels_(num_channels),
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num_samples_written_(0),
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format_(sample_format == SampleFormat::kInt16
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? WavFormat::kWavFormatPcm
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: WavFormat::kWavFormatIeeeFloat),
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file_(std::move(file)) {
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// Handle errors from the OpenWriteOnly call in above constructor.
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RTC_CHECK(file_.is_open()) << "Invalid file. Could not create wav file.";
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RTC_CHECK(CheckWavParameters(num_channels_, sample_rate_, format_,
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num_samples_written_));
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// Write a blank placeholder header, since we need to know the total number
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// of samples before we can fill in the real data.
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static const uint8_t blank_header[MaxWavHeaderSize()] = {0};
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RTC_CHECK(file_.Write(blank_header, WavHeaderSize(format_)));
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}
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void WavWriter::WriteSamples(const int16_t* samples, size_t num_samples) {
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#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
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#error "Need to convert samples to little-endian when writing to WAV file"
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#endif
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for (size_t i = 0; i < num_samples; i += kMaxChunksize) {
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const size_t num_remaining_samples = num_samples - i;
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const size_t num_samples_to_write =
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std::min(kMaxChunksize, num_remaining_samples);
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if (format_ == WavFormat::kWavFormatPcm) {
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RTC_CHECK(
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file_.Write(&samples[i], num_samples_to_write * sizeof(samples[0])));
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} else {
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RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
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std::array<float, kMaxChunksize> converted_samples;
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for (size_t j = 0; j < num_samples_to_write; ++j) {
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converted_samples[j] = S16ToFloat(samples[i + j]);
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}
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RTC_CHECK(
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file_.Write(converted_samples.data(),
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num_samples_to_write * sizeof(converted_samples[0])));
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}
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num_samples_written_ += num_samples_to_write;
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RTC_CHECK_GE(num_samples_written_,
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num_samples_to_write); // detect size_t overflow
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}
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}
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void WavWriter::WriteSamples(const float* samples, size_t num_samples) {
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#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
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#error "Need to convert samples to little-endian when writing to WAV file"
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#endif
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for (size_t i = 0; i < num_samples; i += kMaxChunksize) {
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const size_t num_remaining_samples = num_samples - i;
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const size_t num_samples_to_write =
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std::min(kMaxChunksize, num_remaining_samples);
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if (format_ == WavFormat::kWavFormatPcm) {
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std::array<int16_t, kMaxChunksize> converted_samples;
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for (size_t j = 0; j < num_samples_to_write; ++j) {
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converted_samples[j] = FloatS16ToS16(samples[i + j]);
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}
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RTC_CHECK(
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file_.Write(converted_samples.data(),
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num_samples_to_write * sizeof(converted_samples[0])));
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} else {
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RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
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std::array<float, kMaxChunksize> converted_samples;
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for (size_t j = 0; j < num_samples_to_write; ++j) {
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converted_samples[j] = FloatS16ToFloat(samples[i + j]);
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}
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RTC_CHECK(
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file_.Write(converted_samples.data(),
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num_samples_to_write * sizeof(converted_samples[0])));
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}
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num_samples_written_ += num_samples_to_write;
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RTC_CHECK(num_samples_written_ >=
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num_samples_to_write); // detect size_t overflow
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}
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}
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void WavWriter::Close() {
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RTC_CHECK(file_.Rewind());
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std::array<uint8_t, MaxWavHeaderSize()> header;
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size_t header_size;
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WriteWavHeader(num_channels_, sample_rate_, format_, num_samples_written_,
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header.data(), &header_size);
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RTC_CHECK(file_.Write(header.data(), header_size));
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RTC_CHECK(file_.Close());
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}
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} // namespace webrtc
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