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// Copyright 2019 The Chromium Authors. All rights reserved.
// 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/bind.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,
size_t request_frames,
ReadCB read_cb)
: read_cb_(std::move(read_cb)) {
resampler_.reset(new media::MultiChannelResampler(
channels, io_sample_rate_ratio, request_frames,
base::BindRepeating(&MediaMultiChannelResampler::ProvideResamplerInput,
base::Unretained(this))));
}
void MediaMultiChannelResampler::Resample(int frames,
blink::AudioBus* audio_bus) {
// Create a media::AudioBus wrapper around the memory provided by the
// blink::AudioBus.
std::unique_ptr<media::AudioBus> resampler_bus_ =
media::AudioBus::CreateWrapper(audio_bus->NumberOfChannels());
for (unsigned int i = 0; i < audio_bus->NumberOfChannels(); ++i) {
resampler_bus_->SetChannelData(i, audio_bus->Channel(i)->MutableData());
}
resampler_bus_->set_frames(audio_bus->length());
ResampleInternal(frames, resampler_bus_.get());
}
void MediaMultiChannelResampler::ResampleInternal(int frames,
media::AudioBus* audio_bus) {
resampler_->Resample(frames, audio_bus);
}
void MediaMultiChannelResampler::ProvideResamplerInput(
int resampler_frame_delay,
media::AudioBus* dest) {
// Create a blink::AudioBus wrapper around the memory provided by the
// media::AudioBus.
scoped_refptr<AudioBus> bus =
AudioBus::Create(dest->channels(), dest->frames(), false);
for (int i = 0; i < dest->channels(); ++i) {
bus->SetChannelMemory(i, dest->channel(i), dest->frames());
}
read_cb_.Run(resampler_frame_delay, bus.get());
}
} // namespace blink
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