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// Copyright 2022 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/modules/webaudio/media_stream_audio_source_handler.h"
#include <inttypes.h>
#include "base/synchronization/lock.h"
#include "third_party/blink/public/platform/modules/webrtc/webrtc_logging.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_output.h"
#include "third_party/blink/renderer/modules/webaudio/base_audio_context.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
namespace blink {
namespace {
// Default to stereo. This could change depending on the format of the
// MediaStream's audio track.
constexpr unsigned kDefaultNumberOfOutputChannels = 2;
} // namespace
MediaStreamAudioSourceHandler::MediaStreamAudioSourceHandler(
AudioNode& node,
std::unique_ptr<AudioSourceProvider> audio_source_provider)
: AudioHandler(NodeType::kNodeTypeMediaStreamAudioSource,
node,
node.context()->sampleRate()),
audio_source_provider_(std::move(audio_source_provider)) {
SendLogMessage(__func__, "");
AddOutput(kDefaultNumberOfOutputChannels);
Initialize();
}
scoped_refptr<MediaStreamAudioSourceHandler>
MediaStreamAudioSourceHandler::Create(
AudioNode& node,
std::unique_ptr<AudioSourceProvider> audio_source_provider) {
return base::AdoptRef(new MediaStreamAudioSourceHandler(
node, std::move(audio_source_provider)));
}
MediaStreamAudioSourceHandler::~MediaStreamAudioSourceHandler() {
Uninitialize();
}
void MediaStreamAudioSourceHandler::SetFormat(uint32_t number_of_channels,
float source_sample_rate) {
DCHECK(IsMainThread());
SendLogMessage(
__func__,
String::Format("({number_of_channels=%u}, {source_sample_rate=%0.f})",
number_of_channels, source_sample_rate));
{
base::AutoLock locker(process_lock_);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("webaudio.audionode"),
"MediaStreamAudioSourceHandler::SetFormat under lock");
// If the channel count and the sample rate match, nothing to do here.
if (number_of_channels == source_number_of_channels_ &&
source_sample_rate == Context()->sampleRate()) {
return;
}
// Checks for invalid channel count.
if (number_of_channels == 0 ||
number_of_channels > BaseAudioContext::MaxNumberOfChannels()) {
source_number_of_channels_ = 0;
SendLogMessage(
__func__,
String::Format("=> (ERROR: invalid channel count requested)"));
return;
}
// Checks for invalid sample rate.
if (source_sample_rate != Context()->sampleRate()) {
source_number_of_channels_ = 0;
SendLogMessage(
__func__,
String::Format("=> (ERROR: invalid sample rate requested)"));
return;
}
source_number_of_channels_ = number_of_channels;
}
DeferredTaskHandler::GraphAutoLocker graph_locker(Context());
Output(0).SetNumberOfChannels(number_of_channels);
}
void MediaStreamAudioSourceHandler::Process(uint32_t number_of_frames) {
TRACE_EVENT2(TRACE_DISABLED_BY_DEFAULT("webaudio.audionode"),
"MediaStreamAudioSourceHandler::Process", "this",
reinterpret_cast<void*>(this), "number_of_frames",
number_of_frames);
AudioBus* output_bus = Output(0).Bus();
base::AutoTryLock try_locker(process_lock_);
if (try_locker.is_acquired()) {
if (source_number_of_channels_ != output_bus->NumberOfChannels()) {
output_bus->Zero();
return;
}
audio_source_provider_.get()->ProvideInput(
output_bus, base::checked_cast<int>(number_of_frames));
if (!is_processing_) {
SendLogMessage(__func__, String::Format("({number_of_frames=%u})",
number_of_frames));
SendLogMessage(
__func__,
String::Format("=> (audio source is now alive and audio frames are "
"sent to the output)"));
is_processing_ = true;
}
} else {
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("webaudio.audionode"),
"MediaStreamAudioSourceHandler::Process TryLock failed");
// If we fail to acquire the lock, it means setFormat() is running. So
// output silence.
output_bus->Zero();
}
}
void MediaStreamAudioSourceHandler::SendLogMessage(
const char* const function_name,
const String& message) {
WebRtcLogMessage(String::Format("[WA]MSASH::%s %s [this=0x%" PRIXPTR "]",
function_name, message.Utf8().c_str(),
reinterpret_cast<uintptr_t>(this))
.Utf8());
}
} // namespace blink
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