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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/audio/media_multi_channel_resampler.h"
#include <memory>
#include "base/functional/bind.h"
#include "base/numerics/safe_conversions.h"
#include "media/base/audio_bus.h"
#include "third_party/blink/renderer/platform/audio/audio_bus.h"
namespace blink {
MediaMultiChannelResampler::MediaMultiChannelResampler(
int channels,
double io_sample_rate_ratio,
uint32_t request_frames,
ReadCB read_cb)
: resampler_input_bus_wrapper_(media::AudioBus::CreateWrapper(channels)),
resampler_output_bus_wrapper_(
AudioBus::Create(channels, request_frames, false)),
read_cb_(std::move(read_cb)) {
resampler_ = std::make_unique<media::MultiChannelResampler>(
channels, io_sample_rate_ratio, request_frames,
base::BindRepeating(&MediaMultiChannelResampler::ProvideResamplerInput,
base::Unretained(this)));
}
void MediaMultiChannelResampler::Resample(
int frames,
blink::AudioBus* resampler_input_bus) {
CHECK_EQ(static_cast<int>(resampler_input_bus->NumberOfChannels()),
resampler_input_bus_wrapper_->channels());
resampler_input_bus_wrapper_->set_frames(resampler_input_bus->length());
for (unsigned int i = 0; i < resampler_input_bus->NumberOfChannels(); ++i) {
// TODO(crbug.com/375449662): Spanify `AudioChannel::MuteableData`.
resampler_input_bus_wrapper_->SetChannelData(
i, UNSAFE_TODO(base::span(
resampler_input_bus->Channel(i)->MutableData(),
base::checked_cast<size_t>(resampler_input_bus->length()))));
}
ResampleInternal(frames, resampler_input_bus_wrapper_.get());
}
void MediaMultiChannelResampler::ResampleInternal(
int frames,
media::AudioBus* resampler_input_bus) {
resampler_->Resample(frames, resampler_input_bus);
}
void MediaMultiChannelResampler::ProvideResamplerInput(
int resampler_frame_delay,
media::AudioBus* resampler_output_bus) {
CHECK_EQ(static_cast<int>(resampler_output_bus_wrapper_->NumberOfChannels()),
resampler_output_bus->channels());
for (int i = 0; i < resampler_output_bus->channels(); ++i) {
resampler_output_bus_wrapper_->SetChannelMemory(
i, resampler_output_bus->channel(i), resampler_output_bus->frames());
}
read_cb_.Run(resampler_frame_delay, resampler_output_bus_wrapper_.get());
}
} // namespace blink
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