mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 20:42:43 +00:00
106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
/*
|
|
* Copyright (c) 2020, William McPherson <willmcpherson2@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <LibAudio/WavWriter.h>
|
|
|
|
namespace Audio {
|
|
|
|
WavWriter::WavWriter(StringView path, int sample_rate, u16 num_channels, u16 bits_per_sample)
|
|
: m_sample_rate(sample_rate)
|
|
, m_num_channels(num_channels)
|
|
, m_bits_per_sample(bits_per_sample)
|
|
{
|
|
set_file(path);
|
|
}
|
|
|
|
WavWriter::WavWriter(int sample_rate, u16 num_channels, u16 bits_per_sample)
|
|
: m_sample_rate(sample_rate)
|
|
, m_num_channels(num_channels)
|
|
, m_bits_per_sample(bits_per_sample)
|
|
{
|
|
}
|
|
|
|
WavWriter::~WavWriter()
|
|
{
|
|
if (!m_finalized)
|
|
finalize();
|
|
}
|
|
|
|
void WavWriter::set_file(StringView path)
|
|
{
|
|
m_file = Core::File::construct(path);
|
|
if (!m_file->open(Core::OpenMode::ReadWrite)) {
|
|
m_error_string = String::formatted("Can't open file: {}", m_file->error_string());
|
|
return;
|
|
}
|
|
m_file->seek(44);
|
|
m_finalized = false;
|
|
}
|
|
|
|
void WavWriter::write_samples(u8 const* samples, size_t size)
|
|
{
|
|
m_data_sz += size;
|
|
m_file->write(samples, size);
|
|
}
|
|
|
|
void WavWriter::finalize()
|
|
{
|
|
VERIFY(!m_finalized);
|
|
m_finalized = true;
|
|
if (m_file) {
|
|
m_file->seek(0);
|
|
write_header();
|
|
m_file->close();
|
|
}
|
|
m_data_sz = 0;
|
|
}
|
|
|
|
void WavWriter::write_header()
|
|
{
|
|
// "RIFF"
|
|
static u32 riff = 0x46464952;
|
|
m_file->write(reinterpret_cast<u8*>(&riff), sizeof(riff));
|
|
|
|
// Size of data + (size of header - previous field - this field)
|
|
u32 sz = m_data_sz + (44 - 4 - 4);
|
|
m_file->write(reinterpret_cast<u8*>(&sz), sizeof(sz));
|
|
|
|
// "WAVE"
|
|
static u32 wave = 0x45564157;
|
|
m_file->write(reinterpret_cast<u8*>(&wave), sizeof(wave));
|
|
|
|
// "fmt "
|
|
static u32 fmt_id = 0x20746D66;
|
|
m_file->write(reinterpret_cast<u8*>(&fmt_id), sizeof(fmt_id));
|
|
|
|
// Size of the next 6 fields
|
|
static u32 fmt_size = 16;
|
|
m_file->write(reinterpret_cast<u8*>(&fmt_size), sizeof(fmt_size));
|
|
|
|
// 1 for PCM
|
|
static u16 audio_format = 1;
|
|
m_file->write(reinterpret_cast<u8*>(&audio_format), sizeof(audio_format));
|
|
|
|
m_file->write(reinterpret_cast<u8*>(&m_num_channels), sizeof(m_num_channels));
|
|
|
|
m_file->write(reinterpret_cast<u8*>(&m_sample_rate), sizeof(m_sample_rate));
|
|
|
|
u32 byte_rate = m_sample_rate * m_num_channels * (m_bits_per_sample / 8);
|
|
m_file->write(reinterpret_cast<u8*>(&byte_rate), sizeof(byte_rate));
|
|
|
|
u16 block_align = m_num_channels * (m_bits_per_sample / 8);
|
|
m_file->write(reinterpret_cast<u8*>(&block_align), sizeof(block_align));
|
|
|
|
m_file->write(reinterpret_cast<u8*>(&m_bits_per_sample), sizeof(m_bits_per_sample));
|
|
|
|
// "data"
|
|
static u32 chunk_id = 0x61746164;
|
|
m_file->write(reinterpret_cast<u8*>(&chunk_id), sizeof(chunk_id));
|
|
|
|
m_file->write(reinterpret_cast<u8*>(&m_data_sz), sizeof(m_data_sz));
|
|
}
|
|
|
|
}
|