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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "WebCodecsUtils.h"
#include "DecoderTypes.h"
#include "PlatformEncoderModule.h"
#include "VideoUtils.h"
#include "js/experimental/TypedData.h"
#include "mozilla/Assertions.h"
#include "mozilla/dom/ImageBitmapBinding.h"
#include "mozilla/dom/VideoColorSpaceBinding.h"
#include "mozilla/dom/VideoFrameBinding.h"
#include "mozilla/gfx/Types.h"
#include "nsDebug.h"
extern mozilla::LazyLogModule gWebCodecsLog;
#ifdef LOG_INTERNAL
# undef LOG_INTERNAL
#endif // LOG_INTERNAL
#define LOG_INTERNAL(level, msg, ...) \
MOZ_LOG(gWebCodecsLog, LogLevel::level, (msg, ##__VA_ARGS__))
#ifdef LOG
# undef LOG
#endif // LOG
#define LOG(msg, ...) LOG_INTERNAL(Debug, msg, ##__VA_ARGS__)
namespace mozilla {
std::atomic<WebCodecsId> sNextId = 0;
};
namespace mozilla::dom {
/*
* The followings are helpers for AudioDecoder and VideoDecoder methods
*/
nsTArray<nsCString> GuessContainers(const nsAString& aCodec) {
if (IsAV1CodecString(aCodec)) {
return {"mp4"_ns, "webm"_ns};
}
if (IsVP9CodecString(aCodec)) {
return {"mp4"_ns, "webm"_ns, "ogg"_ns};
}
if (IsVP8CodecString(aCodec)) {
return {"webm"_ns, "ogg"_ns, "3gpp"_ns, "3gpp2"_ns, "3gp2"_ns};
}
if (IsH264CodecString(aCodec)) {
return {"mp4"_ns, "3gpp"_ns, "3gpp2"_ns, "3gp2"_ns};
}
if (IsAACCodecString(aCodec)) {
return {"adts"_ns, "mp4"_ns};
}
if (aCodec.EqualsLiteral("vorbis") || aCodec.EqualsLiteral("opus")) {
return {"ogg"_ns};
}
if (aCodec.EqualsLiteral("flac")) {
return {"flac"_ns};
}
if (aCodec.EqualsLiteral("mp3")) {
return {"mp3"_ns};
}
if (aCodec.EqualsLiteral("ulaw") || aCodec.EqualsLiteral("alaw") ||
aCodec.EqualsLiteral("pcm-u8") || aCodec.EqualsLiteral("pcm-s16") ||
aCodec.EqualsLiteral("pcm-s24") || aCodec.EqualsLiteral("pcm-s32") ||
aCodec.EqualsLiteral("pcm-f32")) {
return {"x-wav"_ns};
}
return {};
}
Maybe<nsString> ParseCodecString(const nsAString& aCodec) {
// Trim the spaces on each end.
nsString str(aCodec);
str.Trim(" ");
nsTArray<nsString> codecs;
if (!ParseCodecsString(str, codecs) || codecs.Length() != 1 ||
codecs[0] != str) {
return Nothing();
}
return Some(codecs[0]);
}
/*
* The below are helpers to operate ArrayBuffer or ArrayBufferView.
*/
static std::tuple<JS::ArrayBufferOrView, size_t, size_t> GetArrayBufferInfo(
JSContext* aCx,
const OwningMaybeSharedArrayBufferViewOrMaybeSharedArrayBuffer& aBuffer) {
if (aBuffer.IsArrayBuffer()) {
const ArrayBuffer& buffer = aBuffer.GetAsArrayBuffer();
size_t length;
{
bool isShared;
uint8_t* data;
JS::GetArrayBufferMaybeSharedLengthAndData(buffer.Obj(), &length,
&isShared, &data);
}
return std::make_tuple(JS::ArrayBufferOrView::fromObject(buffer.Obj()),
(size_t)0, length);
}
MOZ_ASSERT(aBuffer.IsArrayBufferView());
const ArrayBufferView& view = aBuffer.GetAsArrayBufferView();
bool isSharedMemory;
JS::Rooted<JSObject*> obj(aCx, view.Obj());
return std::make_tuple(
JS::ArrayBufferOrView::fromObject(
JS_GetArrayBufferViewBuffer(aCx, obj, &isSharedMemory)),
JS_GetArrayBufferViewByteOffset(obj),
JS_GetArrayBufferViewByteLength(obj));
}
Result<Ok, nsresult> CloneBuffer(
JSContext* aCx,
OwningMaybeSharedArrayBufferViewOrMaybeSharedArrayBuffer& aDest,
const OwningMaybeSharedArrayBufferViewOrMaybeSharedArrayBuffer& aSrc,
ErrorResult& aRv) {
std::tuple<JS::ArrayBufferOrView, size_t, size_t> info =
GetArrayBufferInfo(aCx, aSrc);
JS::Rooted<JS::ArrayBufferOrView> abov(aCx);
abov.set(std::get<0>(info));
size_t offset = std::get<1>(info);
size_t len = std::get<2>(info);
if (NS_WARN_IF(!abov)) {
return Err(NS_ERROR_UNEXPECTED);
}
JS::Rooted<JSObject*> obj(aCx, abov.asObject());
JS::Rooted<JSObject*> cloned(aCx,
JS::ArrayBufferClone(aCx, obj, offset, len));
if (NS_WARN_IF(!cloned)) {
aRv.MightThrowJSException();
aRv.StealExceptionFromJSContext(aCx);
return Err(NS_ERROR_OUT_OF_MEMORY);
}
JS::Rooted<JS::Value> value(aCx, JS::ObjectValue(*cloned));
if (NS_WARN_IF(!aDest.Init(aCx, value))) {
return Err(NS_ERROR_UNEXPECTED);
}
return Ok();
}
/*
* The following are utilities to convert between VideoColorSpace values to
* gfx's values.
*/
gfx::ColorRange ToColorRange(bool aIsFullRange) {
return aIsFullRange ? gfx::ColorRange::FULL : gfx::ColorRange::LIMITED;
}
gfx::YUVColorSpace ToColorSpace(VideoMatrixCoefficients aMatrix) {
switch (aMatrix) {
case VideoMatrixCoefficients::Rgb:
return gfx::YUVColorSpace::Identity;
case VideoMatrixCoefficients::Bt709:
case VideoMatrixCoefficients::Bt470bg:
return gfx::YUVColorSpace::BT709;
case VideoMatrixCoefficients::Smpte170m:
return gfx::YUVColorSpace::BT601;
case VideoMatrixCoefficients::Bt2020_ncl:
return gfx::YUVColorSpace::BT2020;
}
MOZ_ASSERT_UNREACHABLE("unsupported VideoMatrixCoefficients");
return gfx::YUVColorSpace::Default;
}
gfx::TransferFunction ToTransferFunction(
VideoTransferCharacteristics aTransfer) {
switch (aTransfer) {
case VideoTransferCharacteristics::Bt709:
case VideoTransferCharacteristics::Smpte170m:
return gfx::TransferFunction::BT709;
case VideoTransferCharacteristics::Iec61966_2_1:
return gfx::TransferFunction::SRGB;
case VideoTransferCharacteristics::Pq:
return gfx::TransferFunction::PQ;
case VideoTransferCharacteristics::Hlg:
return gfx::TransferFunction::HLG;
case VideoTransferCharacteristics::Linear:
return gfx::TransferFunction::Default;
}
MOZ_ASSERT_UNREACHABLE("unsupported VideoTransferCharacteristics");
return gfx::TransferFunction::Default;
}
gfx::ColorSpace2 ToPrimaries(VideoColorPrimaries aPrimaries) {
switch (aPrimaries) {
case VideoColorPrimaries::Bt709:
return gfx::ColorSpace2::BT709;
case VideoColorPrimaries::Bt470bg:
return gfx::ColorSpace2::BT601_625;
case VideoColorPrimaries::Smpte170m:
return gfx::ColorSpace2::BT601_525;
case VideoColorPrimaries::Bt2020:
return gfx::ColorSpace2::BT2020;
case VideoColorPrimaries::Smpte432:
return gfx::ColorSpace2::DISPLAY_P3;
}
MOZ_ASSERT_UNREACHABLE("unsupported VideoTransferCharacteristics");
return gfx::ColorSpace2::UNKNOWN;
}
bool ToFullRange(const gfx::ColorRange& aColorRange) {
return aColorRange == gfx::ColorRange::FULL;
}
Maybe<VideoMatrixCoefficients> ToMatrixCoefficients(
const gfx::YUVColorSpace& aColorSpace) {
switch (aColorSpace) {
case gfx::YUVColorSpace::BT601:
return Some(VideoMatrixCoefficients::Smpte170m);
case gfx::YUVColorSpace::BT709:
return Some(VideoMatrixCoefficients::Bt709);
case gfx::YUVColorSpace::BT2020:
return Some(VideoMatrixCoefficients::Bt2020_ncl);
case gfx::YUVColorSpace::Identity:
return Some(VideoMatrixCoefficients::Rgb);
}
MOZ_ASSERT_UNREACHABLE("unsupported gfx::YUVColorSpace");
return Nothing();
}
Maybe<VideoTransferCharacteristics> ToTransferCharacteristics(
const gfx::TransferFunction& aTransferFunction) {
switch (aTransferFunction) {
case gfx::TransferFunction::BT709:
return Some(VideoTransferCharacteristics::Bt709);
case gfx::TransferFunction::SRGB:
return Some(VideoTransferCharacteristics::Iec61966_2_1);
case gfx::TransferFunction::PQ:
return Some(VideoTransferCharacteristics::Pq);
case gfx::TransferFunction::HLG:
return Some(VideoTransferCharacteristics::Hlg);
}
MOZ_ASSERT_UNREACHABLE("unsupported gfx::TransferFunction");
return Nothing();
}
Maybe<VideoColorPrimaries> ToPrimaries(const gfx::ColorSpace2& aColorSpace) {
switch (aColorSpace) {
case gfx::ColorSpace2::UNKNOWN:
return Nothing();
case gfx::ColorSpace2::DISPLAY_P3:
return Some(VideoColorPrimaries::Smpte432);
case gfx::ColorSpace2::BT601_525:
return Some(VideoColorPrimaries::Smpte170m);
case gfx::ColorSpace2::SRGB:
case gfx::ColorSpace2::BT709:
return Some(VideoColorPrimaries::Bt709);
case gfx::ColorSpace2::BT2020:
return Some(VideoColorPrimaries::Bt2020);
}
MOZ_ASSERT_UNREACHABLE("unsupported gfx::ColorSpace2");
return Nothing();
}
/*
* The following are utilities to convert from gfx's formats to
* VideoPixelFormats.
*/
Maybe<VideoPixelFormat> SurfaceFormatToVideoPixelFormat(
gfx::SurfaceFormat aFormat) {
switch (aFormat) {
case gfx::SurfaceFormat::B8G8R8A8:
return Some(VideoPixelFormat::BGRA);
case gfx::SurfaceFormat::B8G8R8X8:
return Some(VideoPixelFormat::BGRX);
case gfx::SurfaceFormat::R8G8B8A8:
return Some(VideoPixelFormat::RGBA);
case gfx::SurfaceFormat::R8G8B8X8:
return Some(VideoPixelFormat::RGBX);
case gfx::SurfaceFormat::YUV:
return Some(VideoPixelFormat::I420);
case gfx::SurfaceFormat::NV12:
return Some(VideoPixelFormat::NV12);
case gfx::SurfaceFormat::YUV422:
return Some(VideoPixelFormat::I422);
default:
break;
}
return Nothing();
}
Maybe<VideoPixelFormat> ImageBitmapFormatToVideoPixelFormat(
ImageBitmapFormat aFormat) {
switch (aFormat) {
case ImageBitmapFormat::RGBA32:
return Some(VideoPixelFormat::RGBA);
case ImageBitmapFormat::BGRA32:
return Some(VideoPixelFormat::BGRA);
case ImageBitmapFormat::YUV444P:
return Some(VideoPixelFormat::I444);
case ImageBitmapFormat::YUV422P:
return Some(VideoPixelFormat::I422);
case ImageBitmapFormat::YUV420P:
return Some(VideoPixelFormat::I420);
case ImageBitmapFormat::YUV420SP_NV12:
return Some(VideoPixelFormat::NV12);
default:
break;
}
return Nothing();
}
bool IsOnAndroid() {
#if defined(ANDROID)
return true;
#else
return false;
#endif
}
bool IsOnMacOS() {
#if defined(XP_MACOSX)
return true;
#else
return false;
#endif
}
bool IsOnLinux() {
#if defined(XP_LINUX)
return true;
#else
return false;
#endif
}
template <typename T>
nsCString MaybeToString(const Maybe<T>& aMaybe) {
return nsPrintfCString(
"%s", aMaybe.isSome() ? ToString(aMaybe.value()).c_str() : "nothing");
}
struct ConfigurationChangeToString {
nsCString operator()(const CodecChange& aCodecChange) {
return nsPrintfCString("Codec: %s",
NS_ConvertUTF16toUTF8(aCodecChange.get()).get());
}
nsCString operator()(const DimensionsChange& aDimensionChange) {
return nsPrintfCString("Dimensions: %dx%d", aDimensionChange.get().width,
aDimensionChange.get().height);
}
nsCString operator()(const DisplayDimensionsChange& aDisplayDimensionChange) {
if (aDisplayDimensionChange.get().isNothing()) {
return nsPrintfCString("Display dimensions: nothing");
}
gfx::IntSize displayDimensions = aDisplayDimensionChange.get().value();
return nsPrintfCString("Dimensions: %dx%d", displayDimensions.width,
displayDimensions.height);
}
nsCString operator()(const BitrateChange& aBitrateChange) {
return nsPrintfCString("Bitrate: %skbps",
MaybeToString(aBitrateChange.get()).get());
}
nsCString operator()(const FramerateChange& aFramerateChange) {
return nsPrintfCString("Framerate: %sHz",
MaybeToString(aFramerateChange.get()).get());
}
nsCString operator()(
const HardwareAccelerationChange& aHardwareAccelerationChange) {
return nsPrintfCString(
"HW acceleration: %s",
dom::GetEnumString(aHardwareAccelerationChange.get()).get());
}
nsCString operator()(const AlphaChange& aAlphaChange) {
return nsPrintfCString("Alpha: %s",
dom::GetEnumString(aAlphaChange.get()).get());
}
nsCString operator()(const ScalabilityModeChange& aScalabilityModeChange) {
if (aScalabilityModeChange.get().isNothing()) {
return nsCString("Scalability mode: nothing");
}
return nsPrintfCString(
"Scalability mode: %s",
NS_ConvertUTF16toUTF8(aScalabilityModeChange.get().value()).get());
}
nsCString operator()(const BitrateModeChange& aBitrateModeChange) {
return nsPrintfCString("Bitrate mode: %s",
dom::GetEnumString(aBitrateModeChange.get()).get());
}
nsCString operator()(const LatencyModeChange& aLatencyModeChange) {
return nsPrintfCString("Latency mode: %s",
dom::GetEnumString(aLatencyModeChange.get()).get());
}
nsCString operator()(const ContentHintChange& aContentHintChange) {
return nsPrintfCString("Content hint: %s",
MaybeToString(aContentHintChange.get()).get());
}
template <typename T>
nsCString operator()(const T& aNewBitrate) {
return nsPrintfCString("Not implemented");
}
};
nsCString WebCodecsConfigurationChangeList::ToString() const {
nsCString rv;
for (const WebCodecsEncoderConfigurationItem& change : mChanges) {
nsCString str = change.match(ConfigurationChangeToString());
rv.AppendPrintf("- %s\n", str.get());
}
return rv;
}
using CodecChange = StrongTypedef<nsString, struct CodecChangeTypeWebCodecs>;
using DimensionsChange =
StrongTypedef<gfx::IntSize, struct DimensionsChangeTypeWebCodecs>;
using DisplayDimensionsChange =
StrongTypedef<Maybe<gfx::IntSize>,
struct DisplayDimensionsChangeTypeWebCodecs>;
using BitrateChange =
StrongTypedef<Maybe<uint32_t>, struct BitrateChangeTypeWebCodecs>;
using FramerateChange =
StrongTypedef<Maybe<double>, struct FramerateChangeTypeWebCodecs>;
using HardwareAccelerationChange =
StrongTypedef<dom::HardwareAcceleration,
struct HardwareAccelerationChangeTypeWebCodecs>;
using AlphaChange =
StrongTypedef<dom::AlphaOption, struct AlphaChangeTypeWebCodecs>;
using ScalabilityModeChange =
StrongTypedef<Maybe<nsString>, struct ScalabilityModeChangeTypeWebCodecs>;
using BitrateModeChange = StrongTypedef<dom::VideoEncoderBitrateMode,
struct BitrateModeChangeTypeWebCodecs>;
using LatencyModeChange =
StrongTypedef<dom::LatencyMode, struct LatencyModeTypeChangeTypeWebCodecs>;
using ContentHintChange =
StrongTypedef<Maybe<nsString>, struct ContentHintTypeTypeWebCodecs>;
bool WebCodecsConfigurationChangeList::CanAttemptReconfigure() const {
for (const auto& change : mChanges) {
if (change.is<CodecChange>() || change.is<HardwareAccelerationChange>() ||
change.is<AlphaChange>() || change.is<ScalabilityModeChange>()) {
return false;
}
}
return true;
}
RefPtr<EncoderConfigurationChangeList>
WebCodecsConfigurationChangeList::ToPEMChangeList() const {
auto rv = MakeRefPtr<EncoderConfigurationChangeList>();
MOZ_ASSERT(CanAttemptReconfigure());
for (const auto& change : mChanges) {
if (change.is<dom::DimensionsChange>()) {
rv->Push(mozilla::DimensionsChange(change.as<DimensionsChange>().get()));
} else if (change.is<dom::DisplayDimensionsChange>()) {
rv->Push(mozilla::DisplayDimensionsChange(
change.as<DisplayDimensionsChange>().get()));
} else if (change.is<dom::BitrateChange>()) {
rv->Push(mozilla::BitrateChange(change.as<BitrateChange>().get()));
} else if (change.is<FramerateChange>()) {
rv->Push(mozilla::FramerateChange(change.as<FramerateChange>().get()));
} else if (change.is<dom::BitrateModeChange>()) {
mozilla::BitrateMode mode;
if (change.as<dom::BitrateModeChange>().get() ==
dom::VideoEncoderBitrateMode::Constant) {
mode = mozilla::BitrateMode::Constant;
} else if (change.as<BitrateModeChange>().get() ==
dom::VideoEncoderBitrateMode::Variable) {
mode = mozilla::BitrateMode::Variable;
} else {
// Quantizer, not underlying support yet.
mode = mozilla::BitrateMode::Variable;
}
rv->Push(mozilla::BitrateModeChange(mode));
} else if (change.is<LatencyModeChange>()) {
Usage usage;
if (change.as<LatencyModeChange>().get() == dom::LatencyMode::Quality) {
usage = Usage::Record;
} else {
usage = Usage::Realtime;
}
rv->Push(UsageChange(usage));
} else if (change.is<ContentHintChange>()) {
rv->Push(
mozilla::ContentHintChange(change.as<ContentHintChange>().get()));
}
}
return rv.forget();
}
nsCString ColorSpaceInitToString(
const dom::VideoColorSpaceInit& aColorSpaceInit) {
nsCString rv("VideoColorSpace");
if (!aColorSpaceInit.mFullRange.IsNull()) {
rv.AppendPrintf(" range: %s",
aColorSpaceInit.mFullRange.Value() ? "true" : "false");
}
if (!aColorSpaceInit.mMatrix.IsNull()) {
rv.AppendPrintf(" matrix: %s",
GetEnumString(aColorSpaceInit.mMatrix.Value()).get());
}
if (!aColorSpaceInit.mTransfer.IsNull()) {
rv.AppendPrintf(" transfer: %s",
GetEnumString(aColorSpaceInit.mTransfer.Value()).get());
}
if (!aColorSpaceInit.mPrimaries.IsNull()) {
rv.AppendPrintf(" primaries: %s",
GetEnumString(aColorSpaceInit.mPrimaries.Value()).get());
}
return rv;
}
RefPtr<TaskQueue> GetWebCodecsEncoderTaskQueue() {
return TaskQueue::Create(
GetMediaThreadPool(MediaThreadType::PLATFORM_ENCODER),
"WebCodecs encoding", false);
}
VideoColorSpaceInit FallbackColorSpaceForVideoContent() {
// If we're unable to determine the color space, but we think this is video
// content (e.g. because it's in YUV or NV12 or something like that,
// consider it's in BT709).
// This is step 3 of
VideoColorSpaceInit colorSpace;
colorSpace.mFullRange = false;
colorSpace.mMatrix = VideoMatrixCoefficients::Bt709;
colorSpace.mTransfer = VideoTransferCharacteristics::Bt709;
colorSpace.mPrimaries = VideoColorPrimaries::Bt709;
return colorSpace;
}
VideoColorSpaceInit FallbackColorSpaceForWebContent() {
// If we're unable to determine the color space, but we think this is from
// Web content (canvas, image, svg, etc.), consider it's in sRGB.
// This is step 2 of
VideoColorSpaceInit colorSpace;
colorSpace.mFullRange = true;
colorSpace.mMatrix = VideoMatrixCoefficients::Rgb;
colorSpace.mTransfer = VideoTransferCharacteristics::Iec61966_2_1;
colorSpace.mPrimaries = VideoColorPrimaries::Bt709;
return colorSpace;
}
Maybe<CodecType> CodecStringToCodecType(const nsAString& aCodecString) {
if (StringBeginsWith(aCodecString, u"av01"_ns)) {
return Some(CodecType::AV1);
}
if (StringBeginsWith(aCodecString, u"vp8"_ns)) {
return Some(CodecType::VP8);
}
if (StringBeginsWith(aCodecString, u"vp09"_ns)) {
return Some(CodecType::VP9);
}
if (StringBeginsWith(aCodecString, u"avc1"_ns)) {
return Some(CodecType::H264);
}
return Nothing();
}
nsCString ConfigToString(const VideoDecoderConfig& aConfig) {
nsString rv;
auto internal = VideoDecoderConfigInternal::Create(aConfig);
return internal->ToString();
}
Result<RefPtr<MediaByteBuffer>, nsresult> GetExtraDataFromArrayBuffer(
const OwningMaybeSharedArrayBufferViewOrMaybeSharedArrayBuffer& aBuffer) {
RefPtr<MediaByteBuffer> data = MakeRefPtr<MediaByteBuffer>();
if (!AppendTypedArrayDataTo(aBuffer, *data)) {
return Err(NS_ERROR_OUT_OF_MEMORY);
}
return data->Length() > 0 ? data : nullptr;
}
bool IsSupportedVideoCodec(const nsAString& aCodec) {
LOG("IsSupportedVideoCodec: %s", NS_ConvertUTF16toUTF8(aCodec).get());
// The only codec string accepted for vp8 is "vp8"
if (!IsVP9CodecString(aCodec) && !IsH264CodecString(aCodec) &&
!IsAV1CodecString(aCodec) && !aCodec.EqualsLiteral("vp8")) {
return false;
}
// Gecko allows codec string starts with vp9 or av1 but Webcodecs requires to
// starts with av01 and vp09.
if (StringBeginsWith(aCodec, u"vp9"_ns) ||
StringBeginsWith(aCodec, u"av1"_ns)) {
return false;
}
return true;
}
nsCString ConvertCodecName(const nsCString& aContainer,
const nsCString& aCodec) {
if (!aContainer.EqualsLiteral("x-wav")) {
return aCodec;
}
if (aCodec.EqualsLiteral("ulaw")) {
return nsCString("7");
}
if (aCodec.EqualsLiteral("alaw")) {
return nsCString("6");
}
if (aCodec.Find("f32")) {
return nsCString("3");
}
// Linear PCM
return nsCString("1");
}
bool IsSupportedAudioCodec(const nsAString& aCodec) {
LOG("IsSupportedAudioCodec: %s", NS_ConvertUTF16toUTF8(aCodec).get());
return aCodec.EqualsLiteral("flac") || aCodec.EqualsLiteral("mp3") ||
IsAACCodecString(aCodec) || aCodec.EqualsLiteral("opus") ||
aCodec.EqualsLiteral("ulaw") || aCodec.EqualsLiteral("alaw") ||
aCodec.EqualsLiteral("pcm-u8") || aCodec.EqualsLiteral("pcm-s16") ||
aCodec.EqualsLiteral("pcm-s24") || aCodec.EqualsLiteral("pcm-s32") ||
aCodec.EqualsLiteral("pcm-f32");
}
uint32_t BytesPerSamples(const mozilla::dom::AudioSampleFormat& aFormat) {
switch (aFormat) {
case AudioSampleFormat::U8:
case AudioSampleFormat::U8_planar:
return sizeof(uint8_t);
case AudioSampleFormat::S16:
case AudioSampleFormat::S16_planar:
return sizeof(int16_t);
case AudioSampleFormat::S32:
case AudioSampleFormat::F32:
case AudioSampleFormat::S32_planar:
case AudioSampleFormat::F32_planar:
return sizeof(float);
}
MOZ_ASSERT_UNREACHABLE("Invalid enum value");
return 0;
}
} // namespace mozilla::dom