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/*
* Copyright (C) 2022-2024 Apple Inc. All rights reserved.
* Copyright (C) 2023 Igalia S.L
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WebCodecsAudioDataAlgorithms.h"
#if ENABLE(WEB_CODECS)
#include "ExceptionCode.h"
#include "ExceptionOr.h"
namespace WebCore {
// https://www.w3.org/TR/webcodecs/#valid-audiodatainit
bool isValidAudioDataInit(const WebCodecsAudioData::Init& init)
{
if (init.sampleRate <= 0)
return false;
if (!init.numberOfFrames)
return false;
if (!init.numberOfChannels)
return false;
size_t totalSamples, totalSize;
if (!WTF::safeMultiply(init.numberOfFrames, init.numberOfChannels, totalSamples))
return false;
auto bytesPerSample = computeBytesPerSample(init.format);
if (!WTF::safeMultiply(totalSamples, bytesPerSample, totalSize))
return false;
return init.data.length() >= totalSize;
}
bool isAudioSampleFormatInterleaved(AudioSampleFormat format)
{
switch (format) {
case AudioSampleFormat::U8:
case AudioSampleFormat::S16:
case AudioSampleFormat::S32:
case AudioSampleFormat::F32:
return true;
case AudioSampleFormat::U8Planar:
case AudioSampleFormat::S16Planar:
case AudioSampleFormat::S32Planar:
case AudioSampleFormat::F32Planar:
return false;
}
RELEASE_ASSERT_NOT_REACHED();
return false;
}
size_t computeBytesPerSample(AudioSampleFormat format)
{
switch (format) {
case AudioSampleFormat::U8:
case AudioSampleFormat::U8Planar:
return 1;
case AudioSampleFormat::S16:
case AudioSampleFormat::S16Planar:
return 2;
case AudioSampleFormat::S32:
case AudioSampleFormat::F32:
case AudioSampleFormat::S32Planar:
case AudioSampleFormat::F32Planar:
return 4;
}
RELEASE_ASSERT_NOT_REACHED();
return 0;
}
// https://www.w3.org/TR/webcodecs/#compute-copy-element-count
ExceptionOr<size_t> computeCopyElementCount(const WebCodecsAudioData& data, const WebCodecsAudioData::CopyToOptions& options)
{
auto platformData = data.data().audioData;
if (!platformData)
return Exception { ExceptionCode::InvalidAccessError, "Internal AudioData storage is null"_s };
// 1. Let destFormat be the value of [[format]].
// 2. If options.format exists, assign options.format to destFormat.
auto destFormat = options.format.value_or(platformData->format());
// 3. If destFormat describes an interleaved AudioSampleFormat and options.planeIndex is greater than 0, throw a RangeError.
bool isInterleaved = isAudioSampleFormatInterleaved(destFormat);
if (isInterleaved && options.planeIndex > 0)
return Exception { ExceptionCode::RangeError, "Invalid planeIndex for interleaved format"_s };
// 4. Otherwise, if destFormat describes a planar AudioSampleFormat and if options.planeIndex is greater or equal to [[number of channels]], throw a RangeError.
else if (options.planeIndex >= data.numberOfChannels())
return Exception { ExceptionCode::RangeError, "Invalid planeIndex for planar format"_s };
// 5. If [[format]] does not equal destFormat and the User Agent does not support the requested AudioSampleFormat conversion, throw a NotSupportedError DOMException. Conversion to f32-planar must always be supported.
// The backends based on AVFoundation and GStreamer support all format conversions.
// 6. Let frameCount be the number of frames in the plane identified by options.planeIndex.
// All planes have the same number of frames, always
auto frameCount = data.numberOfFrames();
// 7. If options.frameOffset is greater than or equal to frameCount, throw a RangeError.
if (options.frameOffset && *options.frameOffset > frameCount)
return Exception { ExceptionCode::RangeError, "frameOffset is too large"_s };
// 8. Let copyFrameCount be the difference of subtracting options.frameOffset from frameCount.
auto copyFrameCount = frameCount;
if (options.frameOffset)
copyFrameCount -= *options.frameOffset;
// 9. If options.frameCount exists:
if (options.frameCount) {
// 9.1 If options.frameCount is greater than copyFrameCount, throw a RangeError.
if (*options.frameCount > copyFrameCount)
return Exception { ExceptionCode::RangeError, "frameCount is too large"_s };
// 9.2 Otherwise, assign options.frameCount to copyFrameCount.
copyFrameCount = *options.frameCount;
}
// 10. Let elementCount be copyFrameCount.
// 11. If destFormat describes an interleaved AudioSampleFormat, multiply elementCount by [[number of channels]]
if (isInterleaved) {
size_t elementCount;
if (!WTF::safeMultiply(copyFrameCount, data.numberOfChannels(), elementCount))
return Exception { ExceptionCode::RangeError, "Provided options are causing an overflow"_s };
return elementCount;
}
return copyFrameCount;
}
AudioSampleFormat audioSampleElementFormat(AudioSampleFormat format)
{
switch (format) {
case AudioSampleFormat::U8:
case AudioSampleFormat::U8Planar:
return AudioSampleFormat::U8;
case AudioSampleFormat::S16:
case AudioSampleFormat::S16Planar:
return AudioSampleFormat::S16;
case AudioSampleFormat::S32:
case AudioSampleFormat::S32Planar:
return AudioSampleFormat::S32;
case AudioSampleFormat::F32:
case AudioSampleFormat::F32Planar:
return AudioSampleFormat::F32;
}
RELEASE_ASSERT_NOT_REACHED();
return AudioSampleFormat::U8;
}
AudioSampleFormatSpan audioElementSpan(AudioSampleFormat format, std::span<uint8_t> buffer)
{
auto bytesPerSample = computeBytesPerSample(format);
auto clampedBufferSize = buffer.size_bytes();
clampedBufferSize -= clampedBufferSize % bytesPerSample;
switch (format) {
case AudioSampleFormat::U8:
case AudioSampleFormat::U8Planar:
return buffer;
case AudioSampleFormat::S16:
case AudioSampleFormat::S16Planar:
return spanReinterpretCast<int16_t>(buffer.first(clampedBufferSize));
case AudioSampleFormat::S32:
case AudioSampleFormat::S32Planar:
return spanReinterpretCast<int32_t>(buffer.first(clampedBufferSize));
case AudioSampleFormat::F32:
case AudioSampleFormat::F32Planar:
return spanReinterpretCast<float>(buffer.first(clampedBufferSize));
}
RELEASE_ASSERT_NOT_REACHED();
return buffer;
}
} // namespace WebCore
#endif // ENABLE(WEB_CODECS)
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