AnotherFoxGuy/webrtc-audio-processing
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Drop WAV-related files

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These are only used when WEBRTC_APM_DEBUG_DUMP=1, which we do not set.
Hopefully this makes building on big-endian machines possible.

Fixes: https://gitlab.freedesktop.org/pulseaudio/webrtc-audio-processing/-/issues/31
This commit is contained in:
Arun Raghavan 2024-12-26 13:07:40 -05:00
parent 0d4c5f27b5
commit c144c53039
5 changed files with 0 additions and 933 deletions
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2
webrtc/common_audio/meson.build
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@ -55,8 +55,6 @@ common_audio_sources = [
'vad/vad_gmm.c', 'vad/vad_gmm.c',
'vad/vad_sp.c', 'vad/vad_sp.c',
'vad/webrtc_vad.c', 'vad/webrtc_vad.c',
'wav_file.cc',
'wav_header.cc',
'window_generator.cc', 'window_generator.cc',
] ]

290
webrtc/common_audio/wav_file.cc
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@ -1,290 +0,0 @@
/*
* 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

115
webrtc/common_audio/wav_file.h
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@ -1,115 +0,0 @@
/*
* 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 COMMON_AUDIO_WAV_FILE_H_
#define COMMON_AUDIO_WAV_FILE_H_
#include <stdint.h>
#include <cstddef>
#include <string>
#include "common_audio/wav_header.h"
#include "rtc_base/system/file_wrapper.h"
namespace webrtc {
// Interface to provide access WAV file parameters.
class WavFile {
public:
enum class SampleFormat { kInt16, kFloat };
virtual ~WavFile() {}
virtual int sample_rate() const = 0;
virtual size_t num_channels() const = 0;
virtual size_t num_samples() const = 0;
};
// Simple C++ class for writing 16-bit integer and 32 bit floating point PCM WAV
// files. All error handling is by calls to RTC_CHECK(), making it unsuitable
// for anything but debug code.
class WavWriter final : public WavFile {
public:
// Opens a new WAV file for writing.
WavWriter(absl::string_view filename,
int sample_rate,
size_t num_channels,
SampleFormat sample_format = SampleFormat::kInt16);
WavWriter(FileWrapper file,
int sample_rate,
size_t num_channels,
SampleFormat sample_format = SampleFormat::kInt16);
// Closes the WAV file, after writing its header.
~WavWriter() { Close(); }
WavWriter(const WavWriter&) = delete;
WavWriter& operator=(const WavWriter&) = delete;
// Write additional samples to the file. Each sample is in the range
// [-32768.0,32767.0], 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 override { return sample_rate_; }
size_t num_channels() const override { return num_channels_; }
size_t num_samples() const override { return num_samples_written_; }
private:
void Close();
const int sample_rate_;
const size_t num_channels_;
size_t num_samples_written_;
WavFormat format_;
FileWrapper file_;
};
// Follows the conventions of WavWriter.
class WavReader final : public WavFile {
public:
// Opens an existing WAV file for reading.
explicit WavReader(absl::string_view filename);
explicit WavReader(FileWrapper file);
// Close the WAV file.
~WavReader() { Close(); }
WavReader(const WavReader&) = delete;
WavReader& operator=(const WavReader&) = delete;
// Resets position to the beginning of the file.
void Reset();
// 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 override { return sample_rate_; }
size_t num_channels() const override { return num_channels_; }
size_t num_samples() const override { return num_samples_in_file_; }
private:
void Close();
int sample_rate_;
size_t num_channels_;
WavFormat format_;
size_t num_samples_in_file_;
size_t num_unread_samples_;
FileWrapper file_;
int64_t
data_start_pos_; // Position in the file immediately after WAV header.
};
} // namespace webrtc
#endif // COMMON_AUDIO_WAV_FILE_H_

435
webrtc/common_audio/wav_header.cc
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@ -1,435 +0,0 @@
/*
* 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.
*/
// Based on the WAV file format documentation at
// https://ccrma.stanford.edu/courses/422/projects/WaveFormat/ and
// http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
#include "common_audio/wav_header.h"
#include <cstring>
#include <limits>
#include <string>
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/sanitizer.h"
#include "rtc_base/system/arch.h"
namespace webrtc {
namespace {
#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
#error "Code not working properly for big endian platforms."
#endif
#pragma pack(2)
struct ChunkHeader {
uint32_t ID;
uint32_t Size;
};
static_assert(sizeof(ChunkHeader) == 8, "ChunkHeader size");
#pragma pack(2)
struct RiffHeader {
ChunkHeader header;
uint32_t Format;
};
static_assert(sizeof(RiffHeader) == sizeof(ChunkHeader) + 4, "RiffHeader size");
// We can't nest this definition in WavHeader, because VS2013 gives an error
// on sizeof(WavHeader::fmt): "error C2070: 'unknown': illegal sizeof operand".
#pragma pack(2)
struct FmtPcmSubchunk {
ChunkHeader header;
uint16_t AudioFormat;
uint16_t NumChannels;
uint32_t SampleRate;
uint32_t ByteRate;
uint16_t BlockAlign;
uint16_t BitsPerSample;
};
static_assert(sizeof(FmtPcmSubchunk) == 24, "FmtPcmSubchunk size");
const uint32_t kFmtPcmSubchunkSize =
sizeof(FmtPcmSubchunk) - sizeof(ChunkHeader);
// Pack struct to avoid additional padding bytes.
#pragma pack(2)
struct FmtIeeeFloatSubchunk {
ChunkHeader header;
uint16_t AudioFormat;
uint16_t NumChannels;
uint32_t SampleRate;
uint32_t ByteRate;
uint16_t BlockAlign;
uint16_t BitsPerSample;
uint16_t ExtensionSize;
};
static_assert(sizeof(FmtIeeeFloatSubchunk) == 26, "FmtIeeeFloatSubchunk size");
const uint32_t kFmtIeeeFloatSubchunkSize =
sizeof(FmtIeeeFloatSubchunk) - sizeof(ChunkHeader);
// Simple PCM wav header. It does not include chunks that are not essential to
// read audio samples.
#pragma pack(2)
struct WavHeaderPcm {
RiffHeader riff;
FmtPcmSubchunk fmt;
struct {
ChunkHeader header;
} data;
};
static_assert(sizeof(WavHeaderPcm) == kPcmWavHeaderSize,
"no padding in header");
// IEEE Float Wav header, includes extra chunks necessary for proper non-PCM
// WAV implementation.
#pragma pack(2)
struct WavHeaderIeeeFloat {
RiffHeader riff;
FmtIeeeFloatSubchunk fmt;
struct {
ChunkHeader header;
uint32_t SampleLength;
} fact;
struct {
ChunkHeader header;
} data;
};
static_assert(sizeof(WavHeaderIeeeFloat) == kIeeeFloatWavHeaderSize,
"no padding in header");
uint32_t PackFourCC(char a, char b, char c, char d) {
uint32_t packed_value =
static_cast<uint32_t>(a) | static_cast<uint32_t>(b) << 8 |
static_cast<uint32_t>(c) << 16 | static_cast<uint32_t>(d) << 24;
return packed_value;
}
std::string ReadFourCC(uint32_t x) {
return std::string(reinterpret_cast<char*>(&x), 4);
}
uint16_t MapWavFormatToHeaderField(WavFormat format) {
switch (format) {
case WavFormat::kWavFormatPcm:
return 1;
case WavFormat::kWavFormatIeeeFloat:
return 3;
case WavFormat::kWavFormatALaw:
return 6;
case WavFormat::kWavFormatMuLaw:
return 7;
}
RTC_CHECK_NOTREACHED();
}
WavFormat MapHeaderFieldToWavFormat(uint16_t format_header_value) {
if (format_header_value == 1) {
return WavFormat::kWavFormatPcm;
}
if (format_header_value == 3) {
return WavFormat::kWavFormatIeeeFloat;
}
RTC_CHECK(false) << "Unsupported WAV format";
}
uint32_t RiffChunkSize(size_t bytes_in_payload, size_t header_size) {
return static_cast<uint32_t>(bytes_in_payload + header_size -
sizeof(ChunkHeader));
}
uint32_t ByteRate(size_t num_channels,
int sample_rate,
size_t bytes_per_sample) {
return static_cast<uint32_t>(num_channels * sample_rate * bytes_per_sample);
}
uint16_t BlockAlign(size_t num_channels, size_t bytes_per_sample) {
return static_cast<uint16_t>(num_channels * bytes_per_sample);
}
// Finds a chunk having the sought ID. If found, then `readable` points to the
// first byte of the sought chunk data. If not found, the end of the file is
// reached.
bool FindWaveChunk(ChunkHeader* chunk_header,
WavHeaderReader* readable,
const std::string sought_chunk_id) {
RTC_DCHECK_EQ(sought_chunk_id.size(), 4);
while (true) {
if (readable->Read(chunk_header, sizeof(*chunk_header)) !=
sizeof(*chunk_header))
return false; // EOF.
if (ReadFourCC(chunk_header->ID) == sought_chunk_id)
return true; // Sought chunk found.
// Ignore current chunk by skipping its payload.
if (!readable->SeekForward(chunk_header->Size))
return false; // EOF or error.
}
}
bool ReadFmtChunkData(FmtPcmSubchunk* fmt_subchunk, WavHeaderReader* readable) {
// Reads "fmt " chunk payload.
if (readable->Read(&(fmt_subchunk->AudioFormat), kFmtPcmSubchunkSize) !=
kFmtPcmSubchunkSize)
return false;
const uint32_t fmt_size = fmt_subchunk->header.Size;
if (fmt_size != kFmtPcmSubchunkSize) {
// There is an optional two-byte extension field permitted to be present
// with PCM, but which must be zero.
int16_t ext_size;
if (kFmtPcmSubchunkSize + sizeof(ext_size) != fmt_size)
return false;
if (readable->Read(&ext_size, sizeof(ext_size)) != sizeof(ext_size))
return false;
if (ext_size != 0)
return false;
}
return true;
}
void WritePcmWavHeader(size_t num_channels,
int sample_rate,
size_t bytes_per_sample,
size_t num_samples,
uint8_t* buf,
size_t* header_size) {
RTC_CHECK(buf);
RTC_CHECK(header_size);
*header_size = kPcmWavHeaderSize;
auto header = rtc::MsanUninitialized<WavHeaderPcm>({});
const size_t bytes_in_payload = bytes_per_sample * num_samples;
header.riff.header.ID = PackFourCC('R', 'I', 'F', 'F');
header.riff.header.Size = RiffChunkSize(bytes_in_payload, *header_size);
header.riff.Format = PackFourCC('W', 'A', 'V', 'E');
header.fmt.header.ID = PackFourCC('f', 'm', 't', ' ');
header.fmt.header.Size = kFmtPcmSubchunkSize;
header.fmt.AudioFormat = MapWavFormatToHeaderField(WavFormat::kWavFormatPcm);
header.fmt.NumChannels = static_cast<uint16_t>(num_channels);
header.fmt.SampleRate = sample_rate;
header.fmt.ByteRate = ByteRate(num_channels, sample_rate, bytes_per_sample);
header.fmt.BlockAlign = BlockAlign(num_channels, bytes_per_sample);
header.fmt.BitsPerSample = static_cast<uint16_t>(8 * bytes_per_sample);
header.data.header.ID = PackFourCC('d', 'a', 't', 'a');
header.data.header.Size = static_cast<uint32_t>(bytes_in_payload);
// Do an extra copy rather than writing everything to buf directly, since buf
// might not be correctly aligned.
memcpy(buf, &header, *header_size);
}
void WriteIeeeFloatWavHeader(size_t num_channels,
int sample_rate,
size_t bytes_per_sample,
size_t num_samples,
uint8_t* buf,
size_t* header_size) {
RTC_CHECK(buf);
RTC_CHECK(header_size);
*header_size = kIeeeFloatWavHeaderSize;
auto header = rtc::MsanUninitialized<WavHeaderIeeeFloat>({});
const size_t bytes_in_payload = bytes_per_sample * num_samples;
header.riff.header.ID = PackFourCC('R', 'I', 'F', 'F');
header.riff.header.Size = RiffChunkSize(bytes_in_payload, *header_size);
header.riff.Format = PackFourCC('W', 'A', 'V', 'E');
header.fmt.header.ID = PackFourCC('f', 'm', 't', ' ');
header.fmt.header.Size = kFmtIeeeFloatSubchunkSize;
header.fmt.AudioFormat =
MapWavFormatToHeaderField(WavFormat::kWavFormatIeeeFloat);
header.fmt.NumChannels = static_cast<uint16_t>(num_channels);
header.fmt.SampleRate = sample_rate;
header.fmt.ByteRate = ByteRate(num_channels, sample_rate, bytes_per_sample);
header.fmt.BlockAlign = BlockAlign(num_channels, bytes_per_sample);
header.fmt.BitsPerSample = static_cast<uint16_t>(8 * bytes_per_sample);
header.fmt.ExtensionSize = 0;
header.fact.header.ID = PackFourCC('f', 'a', 'c', 't');
header.fact.header.Size = 4;
header.fact.SampleLength = static_cast<uint32_t>(num_channels * num_samples);
header.data.header.ID = PackFourCC('d', 'a', 't', 'a');
header.data.header.Size = static_cast<uint32_t>(bytes_in_payload);
// Do an extra copy rather than writing everything to buf directly, since buf
// might not be correctly aligned.
memcpy(buf, &header, *header_size);
}
// Returns the number of bytes per sample for the format.
size_t GetFormatBytesPerSample(WavFormat format) {
switch (format) {
case WavFormat::kWavFormatPcm:
// Other values may be OK, but for now we're conservative.
return 2;
case WavFormat::kWavFormatALaw:
case WavFormat::kWavFormatMuLaw:
return 1;
case WavFormat::kWavFormatIeeeFloat:
return 4;
}
RTC_CHECK_NOTREACHED();
}
bool CheckWavParameters(size_t num_channels,
int sample_rate,
WavFormat format,
size_t bytes_per_sample,
size_t num_samples) {
// num_channels, sample_rate, and bytes_per_sample must be positive, must fit
// in their respective fields, and their product must fit in the 32-bit
// ByteRate field.
if (num_channels == 0 || sample_rate <= 0 || bytes_per_sample == 0)
return false;
if (static_cast<uint64_t>(sample_rate) > std::numeric_limits<uint32_t>::max())
return false;
if (num_channels > std::numeric_limits<uint16_t>::max())
return false;
if (static_cast<uint64_t>(bytes_per_sample) * 8 >
std::numeric_limits<uint16_t>::max())
return false;
if (static_cast<uint64_t>(sample_rate) * num_channels * bytes_per_sample >
std::numeric_limits<uint32_t>::max())
return false;
// format and bytes_per_sample must agree.
switch (format) {
case WavFormat::kWavFormatPcm:
// Other values may be OK, but for now we're conservative:
if (bytes_per_sample != 1 && bytes_per_sample != 2)
return false;
break;
case WavFormat::kWavFormatALaw:
case WavFormat::kWavFormatMuLaw:
if (bytes_per_sample != 1)
return false;
break;
case WavFormat::kWavFormatIeeeFloat:
if (bytes_per_sample != 4)
return false;
break;
default:
return false;
}
// The number of bytes in the file, not counting the first ChunkHeader, must
// be less than 2^32; otherwise, the ChunkSize field overflows.
const size_t header_size = kPcmWavHeaderSize - sizeof(ChunkHeader);
const size_t max_samples =
(std::numeric_limits<uint32_t>::max() - header_size) / bytes_per_sample;
if (num_samples > max_samples)
return false;
// Each channel must have the same number of samples.
if (num_samples % num_channels != 0)
return false;
return true;
}
} // namespace
bool CheckWavParameters(size_t num_channels,
int sample_rate,
WavFormat format,
size_t num_samples) {
return CheckWavParameters(num_channels, sample_rate, format,
GetFormatBytesPerSample(format), num_samples);
}
void WriteWavHeader(size_t num_channels,
int sample_rate,
WavFormat format,
size_t num_samples,
uint8_t* buf,
size_t* header_size) {
RTC_CHECK(buf);
RTC_CHECK(header_size);
const size_t bytes_per_sample = GetFormatBytesPerSample(format);
RTC_CHECK(CheckWavParameters(num_channels, sample_rate, format,
bytes_per_sample, num_samples));
if (format == WavFormat::kWavFormatPcm) {
WritePcmWavHeader(num_channels, sample_rate, bytes_per_sample, num_samples,
buf, header_size);
} else {
RTC_CHECK_EQ(format, WavFormat::kWavFormatIeeeFloat);
WriteIeeeFloatWavHeader(num_channels, sample_rate, bytes_per_sample,
num_samples, buf, header_size);
}
}
bool ReadWavHeader(WavHeaderReader* readable,
size_t* num_channels,
int* sample_rate,
WavFormat* format,
size_t* bytes_per_sample,
size_t* num_samples,
int64_t* data_start_pos) {
// Read using the PCM header, even though it might be float Wav file
auto header = rtc::MsanUninitialized<WavHeaderPcm>({});
// Read RIFF chunk.
if (readable->Read(&header.riff, sizeof(header.riff)) != sizeof(header.riff))
return false;
if (ReadFourCC(header.riff.header.ID) != "RIFF")
return false;
if (ReadFourCC(header.riff.Format) != "WAVE")
return false;
// Find "fmt " and "data" chunks. While the official Wave file specification
// does not put requirements on the chunks order, it is uncommon to find the
// "data" chunk before the "fmt " one. The code below fails if this is not the
// case.
if (!FindWaveChunk(&header.fmt.header, readable, "fmt ")) {
RTC_LOG(LS_ERROR) << "Cannot find 'fmt ' chunk.";
return false;
}
if (!ReadFmtChunkData(&header.fmt, readable)) {
RTC_LOG(LS_ERROR) << "Cannot read 'fmt ' chunk.";
return false;
}
if (!FindWaveChunk(&header.data.header, readable, "data")) {
RTC_LOG(LS_ERROR) << "Cannot find 'data' chunk.";
return false;
}
// Parse needed fields.
*format = MapHeaderFieldToWavFormat(header.fmt.AudioFormat);
*num_channels = header.fmt.NumChannels;
*sample_rate = header.fmt.SampleRate;
*bytes_per_sample = header.fmt.BitsPerSample / 8;
const size_t bytes_in_payload = header.data.header.Size;
if (*bytes_per_sample == 0)
return false;
*num_samples = bytes_in_payload / *bytes_per_sample;
const size_t header_size = *format == WavFormat::kWavFormatPcm
? kPcmWavHeaderSize
: kIeeeFloatWavHeaderSize;
if (header.riff.header.Size < RiffChunkSize(bytes_in_payload, header_size))
return false;
if (header.fmt.ByteRate !=
ByteRate(*num_channels, *sample_rate, *bytes_per_sample))
return false;
if (header.fmt.BlockAlign != BlockAlign(*num_channels, *bytes_per_sample))
return false;
if (!CheckWavParameters(*num_channels, *sample_rate, *format,
*bytes_per_sample, *num_samples)) {
return false;
}
*data_start_pos = readable->GetPosition();
return true;
}
} // namespace webrtc

91
webrtc/common_audio/wav_header.h
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@ -1,91 +0,0 @@
/*
* 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 COMMON_AUDIO_WAV_HEADER_H_
#define COMMON_AUDIO_WAV_HEADER_H_
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include "rtc_base/checks.h"
namespace webrtc {
// Interface providing header reading functionality.
class WavHeaderReader {
public:
// Returns the number of bytes read.
virtual size_t Read(void* buf, size_t num_bytes) = 0;
virtual bool SeekForward(uint32_t num_bytes) = 0;
virtual ~WavHeaderReader() = default;
virtual int64_t GetPosition() = 0;
};
// Possible WAV formats.
enum class WavFormat {
kWavFormatPcm = 1, // PCM, each sample of size bytes_per_sample.
kWavFormatIeeeFloat = 3, // IEEE float.
kWavFormatALaw = 6, // 8-bit ITU-T G.711 A-law.
kWavFormatMuLaw = 7, // 8-bit ITU-T G.711 mu-law.
};
// Header sizes for supported WAV formats.
constexpr size_t kPcmWavHeaderSize = 44;
constexpr size_t kIeeeFloatWavHeaderSize = 58;
// Returns the size of the WAV header for the specified format.
constexpr size_t WavHeaderSize(WavFormat format) {
if (format == WavFormat::kWavFormatPcm) {
return kPcmWavHeaderSize;
}
RTC_CHECK_EQ(format, WavFormat::kWavFormatIeeeFloat);
return kIeeeFloatWavHeaderSize;
}
// Returns the maximum size of the supported WAV formats.
constexpr size_t MaxWavHeaderSize() {
return std::max(WavHeaderSize(WavFormat::kWavFormatPcm),
WavHeaderSize(WavFormat::kWavFormatIeeeFloat));
}
// Return true if the given parameters will make a well-formed WAV header.
bool CheckWavParameters(size_t num_channels,
int sample_rate,
WavFormat format,
size_t num_samples);
// Write a kWavHeaderSize bytes long WAV header to buf. The payload that
// follows the header is supposed to have the specified number of interleaved
// channels and contain the specified total number of samples of the specified
// type. The size of the header is returned in header_size. CHECKs the input
// parameters for validity.
void WriteWavHeader(size_t num_channels,
int sample_rate,
WavFormat format,
size_t num_samples,
uint8_t* buf,
size_t* header_size);
// Read a WAV header from an implemented WavHeaderReader and parse the values
// into the provided output parameters. WavHeaderReader is used because the
// header can be variably sized. Returns false if the header is invalid.
bool ReadWavHeader(WavHeaderReader* readable,
size_t* num_channels,
int* sample_rate,
WavFormat* format,
size_t* bytes_per_sample,
size_t* num_samples,
int64_t* data_start_pos);
} // namespace webrtc
#endif // COMMON_AUDIO_WAV_HEADER_H_