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// Copyright 2017 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/modules/mediarecorder/audio_track_pcm_encoder.h"
#include "base/cxx17_backports.h"
#include "base/logging.h"
#include "media/base/audio_sample_types.h"
#include "media/base/audio_timestamp_helper.h"
namespace blink {
AudioTrackPcmEncoder::AudioTrackPcmEncoder(OnEncodedAudioCB on_encoded_audio_cb)
: AudioTrackEncoder(std::move(on_encoded_audio_cb)) {}
void AudioTrackPcmEncoder::OnSetFormat(
const media::AudioParameters& input_params) {
DVLOG(1) << __func__
<< ", |input_params_|: " << input_params_.AsHumanReadableString();
DCHECK_CALLED_ON_VALID_THREAD(encoder_thread_checker_);
if (!input_params.IsValid()) {
DLOG(ERROR) << "Invalid params: " << input_params.AsHumanReadableString();
return;
}
input_params_ = input_params;
}
void AudioTrackPcmEncoder::EncodeAudio(
std::unique_ptr<media::AudioBus> input_bus,
base::TimeTicks capture_time) {
DVLOG(3) << __func__ << ", #frames " << input_bus->frames();
DCHECK_CALLED_ON_VALID_THREAD(encoder_thread_checker_);
DCHECK_EQ(input_bus->channels(), input_params_.channels());
DCHECK(!capture_time.is_null());
if (paused_)
return;
std::string encoded_data_string;
encoded_data_string.resize(input_bus->frames() * input_bus->channels() *
sizeof(float));
char* encoded_data_ptr = base::data(encoded_data_string);
input_bus->ToInterleaved<media::Float32SampleTypeTraits>(
input_bus->frames(), reinterpret_cast<float*>(encoded_data_ptr));
const base::TimeTicks capture_time_of_first_sample =
capture_time - media::AudioTimestampHelper::FramesToTime(
input_bus->frames(), input_params_.sample_rate());
on_encoded_audio_cb_.Run(input_params_, std::move(encoded_data_string),
capture_time_of_first_sample);
}
} // namespace blink
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