void
AudioContext::DecodeAudioData(const ArrayBuffer& aBuffer,
DecodeSuccessCallback& aSuccessCallback,
const Optional<OwningNonNull<DecodeErrorCallback> >& aFailureCallback)
{
AutoJSAPI jsapi;
jsapi.Init();
JSContext* cx = jsapi.cx();
JSAutoCompartment ac(cx, aBuffer.Obj());
aBuffer.ComputeLengthAndData();
// Neuter the array buffer
size_t length = aBuffer.Length();
JS::RootedObject obj(cx, aBuffer.Obj());
uint8_t* data = static_cast<uint8_t*>(JS_StealArrayBufferContents(cx, obj));
// Sniff the content of the media.
// Failed type sniffing will be handled by AsyncDecodeMedia.
nsAutoCString contentType;
NS_SniffContent(NS_DATA_SNIFFER_CATEGORY, nullptr, data, length, contentType);
nsRefPtr<DecodeErrorCallback> failureCallback;
if (aFailureCallback.WasPassed()) {
failureCallback = &aFailureCallback.Value();
}
nsRefPtr<WebAudioDecodeJob> job(
new WebAudioDecodeJob(contentType, this,
&aSuccessCallback, failureCallback));
mDecoder.AsyncDecodeMedia(contentType.get(), data, length, *job);
// Transfer the ownership to mDecodeJobs
mDecodeJobs.AppendElement(job);
}
already_AddRefed<Promise>
AudioContext::DecodeAudioData(const ArrayBuffer& aBuffer,
const Optional<OwningNonNull<DecodeSuccessCallback> >& aSuccessCallback,
const Optional<OwningNonNull<DecodeErrorCallback> >& aFailureCallback,
ErrorResult& aRv)
{
nsCOMPtr<nsIGlobalObject> parentObject = do_QueryInterface(GetParentObject());
RefPtr<Promise> promise;
AutoJSAPI jsapi;
jsapi.Init();
JSContext* cx = jsapi.cx();
JSAutoCompartment ac(cx, aBuffer.Obj());
promise = Promise::Create(parentObject, aRv);
if (aRv.Failed()) {
return nullptr;
}
aBuffer.ComputeLengthAndData();
if (aBuffer.IsShared()) {
// Throw if the object is mapping shared memory (must opt in).
aRv.ThrowTypeError<MSG_TYPEDARRAY_IS_SHARED>(NS_LITERAL_STRING("Argument of AudioContext.decodeAudioData"));
return nullptr;
}
// Detach the array buffer
size_t length = aBuffer.Length();
JS::RootedObject obj(cx, aBuffer.Obj());
uint8_t* data = static_cast<uint8_t*>(JS_StealArrayBufferContents(cx, obj));
// Sniff the content of the media.
// Failed type sniffing will be handled by AsyncDecodeWebAudio.
nsAutoCString contentType;
NS_SniffContent(NS_DATA_SNIFFER_CATEGORY, nullptr, data, length, contentType);
RefPtr<DecodeErrorCallback> failureCallback;
RefPtr<DecodeSuccessCallback> successCallback;
if (aFailureCallback.WasPassed()) {
failureCallback = &aFailureCallback.Value();
}
if (aSuccessCallback.WasPassed()) {
successCallback = &aSuccessCallback.Value();
}
RefPtr<WebAudioDecodeJob> job(
new WebAudioDecodeJob(contentType, this,
promise, successCallback, failureCallback));
AsyncDecodeWebAudio(contentType.get(), data, length, *job);
// Transfer the ownership to mDecodeJobs
mDecodeJobs.AppendElement(job.forget());
return promise.forget();
}
bool TestStealContents()
{
JS::RootedObject obj(cx, CreateNewObject(8, 12));
CHECK(obj);
void* contents = JS_StealArrayBufferContents(cx, obj);
CHECK(contents);
CHECK(memcmp(contents, test_data + 8, 12) == 0);
CHECK(JS_IsDetachedArrayBufferObject(obj));
return true;
}
already_AddRefed<ThreadSharedFloatArrayBufferList>
AudioBuffer::StealJSArrayDataIntoSharedChannels(JSContext* aJSContext)
{
// "1. If any of the AudioBuffer's ArrayBuffer have been detached, abort
// these steps, and return a zero-length channel data buffers to the
// invoker."
for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
JSObject* channelArray = mJSChannels[i];
if (!channelArray || mLength != JS_GetTypedArrayLength(channelArray)) {
// Either empty buffer or one of the arrays' buffers was detached.
return nullptr;
}
}
// "2. Detach all ArrayBuffers for arrays previously returned by
// getChannelData on this AudioBuffer."
// "3. Retain the underlying data buffers from those ArrayBuffers and return
// references to them to the invoker."
RefPtr<ThreadSharedFloatArrayBufferList> result =
new ThreadSharedFloatArrayBufferList(mJSChannels.Length());
for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
if (mJSChannels[i]) {
JS::ExposeObjectToActiveJS(mJSChannels[i]);
}
JS::Rooted<JSObject*> arrayBufferView(aJSContext, mJSChannels[i]);
bool isSharedMemory;
JS::Rooted<JSObject*> arrayBuffer(aJSContext,
JS_GetArrayBufferViewBuffer(aJSContext,
arrayBufferView,
&isSharedMemory));
if (arrayBuffer) {
JS::ExposeObjectToActiveJS(arrayBuffer);
}
// The channel data arrays should all have originated in
// RestoreJSChannelData, where they are created unshared.
MOZ_ASSERT(!isSharedMemory);
auto stolenData = arrayBuffer
? static_cast<float*>(JS_StealArrayBufferContents(aJSContext,
arrayBuffer))
: nullptr;
if (stolenData) {
result->SetData(i, stolenData, js_free, stolenData);
} else {
NS_ASSERTION(i == 0, "some channels lost when contents not acquired");
return nullptr;
}
}
for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
mJSChannels[i] = nullptr;
}
return result.forget();
}
already_AddRefed<Promise>
AudioContext::DecodeAudioData(const ArrayBuffer& aBuffer,
const Optional<OwningNonNull<DecodeSuccessCallback> >& aSuccessCallback,
const Optional<OwningNonNull<DecodeErrorCallback> >& aFailureCallback)
{
ErrorResult rv;
nsCOMPtr<nsIGlobalObject> parentObject = do_QueryInterface(GetParentObject());
nsRefPtr<Promise> promise;
AutoJSAPI jsapi;
jsapi.Init();
JSContext* cx = jsapi.cx();
JSAutoCompartment ac(cx, aBuffer.Obj());
promise = Promise::Create(parentObject, rv);
if (rv.Failed()) {
return nullptr;
}
aBuffer.ComputeLengthAndData();
// Neuter the array buffer
size_t length = aBuffer.Length();
JS::RootedObject obj(cx, aBuffer.Obj());
uint8_t* data = static_cast<uint8_t*>(JS_StealArrayBufferContents(cx, obj));
// Sniff the content of the media.
// Failed type sniffing will be handled by AsyncDecodeMedia.
nsAutoCString contentType;
NS_SniffContent(NS_DATA_SNIFFER_CATEGORY, nullptr, data, length, contentType);
nsRefPtr<DecodeErrorCallback> failureCallback;
nsRefPtr<DecodeSuccessCallback> successCallback;
if (aFailureCallback.WasPassed()) {
failureCallback = &aFailureCallback.Value();
}
if (aSuccessCallback.WasPassed()) {
successCallback = &aSuccessCallback.Value();
}
nsRefPtr<WebAudioDecodeJob> job(
new WebAudioDecodeJob(contentType, this,
promise, successCallback, failureCallback));
mDecoder.AsyncDecodeMedia(contentType.get(), data, length, *job);
// Transfer the ownership to mDecodeJobs
mDecodeJobs.AppendElement(job.forget());
return promise.forget();
}
static already_AddRefed<ThreadSharedFloatArrayBufferList>
StealJSArrayDataIntoThreadSharedFloatArrayBufferList(JSContext* aJSContext,
const nsTArray<JSObject*>& aJSArrays)
{
nsRefPtr<ThreadSharedFloatArrayBufferList> result =
new ThreadSharedFloatArrayBufferList(aJSArrays.Length());
for (uint32_t i = 0; i < aJSArrays.Length(); ++i) {
JS::RootedObject arrayBuffer(aJSContext, JS_GetArrayBufferViewBuffer(aJSArrays[i]));
void* dataToFree = nullptr;
uint8_t* stolenData = nullptr;
if (arrayBuffer &&
JS_StealArrayBufferContents(aJSContext, arrayBuffer, &dataToFree,
&stolenData)) {
result->SetData(i, dataToFree, reinterpret_cast<float*>(stolenData));
} else {
return nullptr;
}
}
return result.forget();
}