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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, kleines Filmröllchen <filmroellchen@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Buffer.h"
#include <AK/Atomic.h>
#include <AK/Debug.h>
#include <AK/StdLibExtras.h>
#include <AK/String.h>
namespace Audio {
i32 Buffer::allocate_id()
{
static Atomic<i32> next_id;
return next_id++;
}
template<typename SampleReader>
static void read_samples_from_stream(InputMemoryStream& stream, SampleReader read_sample, Vector<Sample>& samples, int num_channels)
{
double left_channel_sample = 0;
double right_channel_sample = 0;
switch (num_channels) {
case 1:
for (;;) {
left_channel_sample = read_sample(stream);
samples.append(Sample(left_channel_sample));
if (stream.handle_any_error()) {
break;
}
}
break;
case 2:
for (;;) {
left_channel_sample = read_sample(stream);
right_channel_sample = read_sample(stream);
samples.append(Sample(left_channel_sample, right_channel_sample));
if (stream.handle_any_error()) {
break;
}
}
break;
default:
VERIFY_NOT_REACHED();
}
}
static double read_float_sample_64(InputMemoryStream& stream)
{
LittleEndian<double> sample;
stream >> sample;
return double(sample);
}
static double read_float_sample_32(InputMemoryStream& stream)
{
LittleEndian<float> sample;
stream >> sample;
return double(sample);
}
static double read_norm_sample_24(InputMemoryStream& stream)
{
u8 byte = 0;
stream >> byte;
u32 sample1 = byte;
stream >> byte;
u32 sample2 = byte;
stream >> byte;
u32 sample3 = byte;
i32 value = 0;
value = sample1 << 8;
value |= (sample2 << 16);
value |= (sample3 << 24);
return double(value) / NumericLimits<i32>::max();
}
static double read_norm_sample_16(InputMemoryStream& stream)
{
LittleEndian<i16> sample;
stream >> sample;
return double(sample) / NumericLimits<i16>::max();
}
static double read_norm_sample_8(InputMemoryStream& stream)
{
u8 sample = 0;
stream >> sample;
return double(sample) / NumericLimits<u8>::max();
}
ErrorOr<NonnullRefPtr<Buffer>> Buffer::from_pcm_data(ReadonlyBytes data, int num_channels, PcmSampleFormat sample_format)
{
InputMemoryStream stream { data };
return from_pcm_stream(stream, num_channels, sample_format, data.size() / (pcm_bits_per_sample(sample_format) / 8));
}
ErrorOr<NonnullRefPtr<Buffer>> Buffer::from_pcm_stream(InputMemoryStream& stream, int num_channels, PcmSampleFormat sample_format, int num_samples)
{
Vector<Sample> fdata;
fdata.ensure_capacity(num_samples);
switch (sample_format) {
case PcmSampleFormat::Uint8:
read_samples_from_stream(stream, read_norm_sample_8, fdata, num_channels);
break;
case PcmSampleFormat::Int16:
read_samples_from_stream(stream, read_norm_sample_16, fdata, num_channels);
break;
case PcmSampleFormat::Int24:
read_samples_from_stream(stream, read_norm_sample_24, fdata, num_channels);
break;
case PcmSampleFormat::Float32:
read_samples_from_stream(stream, read_float_sample_32, fdata, num_channels);
break;
case PcmSampleFormat::Float64:
read_samples_from_stream(stream, read_float_sample_64, fdata, num_channels);
break;
default:
VERIFY_NOT_REACHED();
}
// We should handle this in a better way above, but for now --
// just make sure we're good. Worst case we just write some 0s where they
// don't belong.
VERIFY(!stream.handle_any_error());
return Buffer::create_with_samples(move(fdata));
}
}
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