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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Atomic.h>
#include <LibAudio/Buffer.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, ResampleHelper& resampler, int num_channels)
{
double norm_l = 0;
double norm_r = 0;
switch (num_channels) {
case 1:
for (;;) {
while (resampler.read_sample(norm_l, norm_r)) {
samples.append(Sample(norm_l));
}
norm_l = read_sample(stream);
if (stream.handle_any_error()) {
break;
}
resampler.process_sample(norm_l, norm_r);
}
break;
case 2:
for (;;) {
while (resampler.read_sample(norm_l, norm_r)) {
samples.append(Sample(norm_l, norm_r));
}
norm_l = read_sample(stream);
norm_r = read_sample(stream);
if (stream.handle_any_error()) {
break;
}
resampler.process_sample(norm_l, norm_r);
}
break;
default:
VERIFY_NOT_REACHED();
}
}
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();
}
RefPtr<Buffer> Buffer::from_pcm_data(ReadonlyBytes data, ResampleHelper& resampler, int num_channels, int bits_per_sample)
{
InputMemoryStream stream { data };
return from_pcm_stream(stream, resampler, num_channels, bits_per_sample, data.size() / (bits_per_sample / 8));
}
RefPtr<Buffer> Buffer::from_pcm_stream(InputMemoryStream& stream, ResampleHelper& resampler, int num_channels, int bits_per_sample, int num_samples)
{
Vector<Sample> fdata;
fdata.ensure_capacity(num_samples);
switch (bits_per_sample) {
case 8:
read_samples_from_stream(stream, read_norm_sample_8, fdata, resampler, num_channels);
break;
case 16:
read_samples_from_stream(stream, read_norm_sample_16, fdata, resampler, num_channels);
break;
case 24:
read_samples_from_stream(stream, read_norm_sample_24, fdata, resampler, 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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