The Tor Browser: content/media/wave/WaveReader.cpp@a63d609f5ebe (annotated)

content/media/wave/WaveReader.cpp@a63d609f5ebe (annotated)

content/media/wave/WaveReader.cpp

Thu, 15 Jan 2015 15:55:04 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:55:04 +0100
branch: TOR_BUG_9701
changeset 9: a63d609f5ebe
permissions: -rw-r--r--

Back out 97036ab72558 which inappropriately compared turds to third parties.

 /* -*- 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
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "nsError.h"
 #include "AbstractMediaDecoder.h"
 #include "MediaResource.h"
 #include "WaveReader.h"
 #include "mozilla/dom/TimeRanges.h"
 #include "MediaDecoderStateMachine.h"
 #include "VideoUtils.h"
 #include "nsISeekableStream.h"
 #include <stdint.h>
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/CheckedInt.h"
 #include "mozilla/Endian.h"
 #include <algorithm>
 namespace mozilla {
 // Un-comment to enable logging of seek bisections.
 //#define SEEK_LOGGING
 #ifdef PR_LOGGING
 extern PRLogModuleInfo* gMediaDecoderLog;
 #define LOG(type, msg) PR_LOG(gMediaDecoderLog, type, msg)
 #ifdef SEEK_LOGGING
 #define SEEK_LOG(type, msg) PR_LOG(gMediaDecoderLog, type, msg)
 #else
 #define SEEK_LOG(type, msg)
 #endif
 #else
 #define LOG(type, msg)
 #define SEEK_LOG(type, msg)
 #endif
 struct waveIdToName {
   uint32_t id;
   nsCString name;
 };
 // Magic values that identify RIFF chunks we're interested in.
 static const uint32_t RIFF_CHUNK_MAGIC = 0x52494646;
 static const uint32_t WAVE_CHUNK_MAGIC = 0x57415645;
 static const uint32_t FRMT_CHUNK_MAGIC = 0x666d7420;
 static const uint32_t DATA_CHUNK_MAGIC = 0x64617461;
 static const uint32_t LIST_CHUNK_MAGIC = 0x4c495354;
 // Size of chunk header.  4 byte chunk header type and 4 byte size field.
 static const uint16_t CHUNK_HEADER_SIZE = 8;
 // Size of RIFF header.  RIFF chunk and 4 byte RIFF type.
 static const uint16_t RIFF_INITIAL_SIZE = CHUNK_HEADER_SIZE + 4;
 // Size of required part of format chunk.  Actual format chunks may be
 // extended (for non-PCM encodings), but we skip any extended data.
 static const uint16_t WAVE_FORMAT_CHUNK_SIZE = 16;
 // PCM encoding type from format chunk.  Linear PCM is the only encoding
 // supported by AudioStream.
 static const uint16_t WAVE_FORMAT_ENCODING_PCM = 1;
 // We reject files with more than this number of channels if we're decoding for
 // playback.
 static const uint8_t MAX_CHANNELS = 2;
 namespace {
   uint32_t
   ReadUint32BE(const char** aBuffer)
   {
     uint32_t result = BigEndian::readUint32(*aBuffer);
     *aBuffer += sizeof(uint32_t);
     return result;
   }
   uint32_t
   ReadUint32LE(const char** aBuffer)
   {
     uint32_t result = LittleEndian::readUint32(*aBuffer);
     *aBuffer += sizeof(uint32_t);
     return result;
   }
   uint16_t
   ReadUint16LE(const char** aBuffer)
   {
     uint16_t result = LittleEndian::readUint16(*aBuffer);
     *aBuffer += sizeof(uint16_t);
     return result;
   }
   int16_t
   ReadInt16LE(const char** aBuffer)
   {
     uint16_t result = LittleEndian::readInt16(*aBuffer);
     *aBuffer += sizeof(int16_t);
     return result;
   }
   uint8_t
   ReadUint8(const char** aBuffer)
   {
     uint8_t result = uint8_t((*aBuffer)[0]);
     *aBuffer += sizeof(uint8_t);
     return result;
   }
 }
 WaveReader::WaveReader(AbstractMediaDecoder* aDecoder)
   : MediaDecoderReader(aDecoder)
 {
   MOZ_COUNT_CTOR(WaveReader);
 }
 WaveReader::~WaveReader()
 {
   MOZ_COUNT_DTOR(WaveReader);
 }
 nsresult WaveReader::Init(MediaDecoderReader* aCloneDonor)
 {
   return NS_OK;
 }
 nsresult WaveReader::ReadMetadata(MediaInfo* aInfo,
                                   MetadataTags** aTags)
 {
   NS_ASSERTION(mDecoder->OnDecodeThread(), "Should be on decode thread.");
   bool loaded = LoadRIFFChunk();
   if (!loaded) {
     return NS_ERROR_FAILURE;
   }
   nsAutoPtr<dom::HTMLMediaElement::MetadataTags> tags;
   bool loadAllChunks = LoadAllChunks(tags);
   if (!loadAllChunks) {
     return NS_ERROR_FAILURE;
   }
   mInfo.mAudio.mHasAudio = true;
   mInfo.mAudio.mRate = mSampleRate;
   mInfo.mAudio.mChannels = mChannels;
   *aInfo = mInfo;
   *aTags = tags.forget();
   ReentrantMonitorAutoEnter mon(mDecoder->GetReentrantMonitor());
   mDecoder->SetMediaDuration(
     static_cast<int64_t>(BytesToTime(GetDataLength()) * USECS_PER_S));
   return NS_OK;
 }
 template <typename T> T UnsignedByteToAudioSample(uint8_t aValue);
 template <typename T> T SignedShortToAudioSample(int16_t aValue);
 template <> inline float
 UnsignedByteToAudioSample<float>(uint8_t aValue)
 {
   return aValue * (2.0f / UINT8_MAX) - 1.0f;
 }
 template <> inline int16_t
 UnsignedByteToAudioSample<int16_t>(uint8_t aValue)
 {
   return int16_t(aValue * UINT16_MAX / UINT8_MAX + INT16_MIN);
 }
 template <> inline float
 SignedShortToAudioSample<float>(int16_t aValue)
 {
   return AudioSampleToFloat(aValue);
 }
 template <> inline int16_t
 SignedShortToAudioSample<int16_t>(int16_t aValue)
 {
   return aValue;
 }
 bool WaveReader::DecodeAudioData()
 {
   NS_ASSERTION(mDecoder->OnDecodeThread(), "Should be on decode thread.");
   int64_t pos = GetPosition() - mWavePCMOffset;
   int64_t len = GetDataLength();
   int64_t remaining = len - pos;
   NS_ASSERTION(remaining >= 0, "Current wave position is greater than wave file length");
   static const int64_t BLOCK_SIZE = 4096;
   int64_t readSize = std::min(BLOCK_SIZE, remaining);
   int64_t frames = readSize / mFrameSize;
   static_assert(uint64_t(BLOCK_SIZE) < UINT_MAX /
                 sizeof(AudioDataValue) / MAX_CHANNELS,
                 "bufferSize calculation could overflow.");
   const size_t bufferSize = static_cast<size_t>(frames * mChannels);
   nsAutoArrayPtr<AudioDataValue> sampleBuffer(new AudioDataValue[bufferSize]);
   static_assert(uint64_t(BLOCK_SIZE) < UINT_MAX / sizeof(char),
                 "BLOCK_SIZE too large for enumerator.");
   nsAutoArrayPtr<char> dataBuffer(new char[static_cast<size_t>(readSize)]);
   if (!ReadAll(dataBuffer, readSize)) {
     return false;
   }
   // convert data to samples
   const char* d = dataBuffer.get();
   AudioDataValue* s = sampleBuffer.get();
   for (int i = 0; i < frames; ++i) {
     for (unsigned int j = 0; j < mChannels; ++j) {
       if (mSampleFormat == FORMAT_U8) {
         uint8_t v =  ReadUint8(&d);
         *s++ = UnsignedByteToAudioSample<AudioDataValue>(v);
       } else if (mSampleFormat == FORMAT_S16) {
         int16_t v =  ReadInt16LE(&d);
         *s++ = SignedShortToAudioSample<AudioDataValue>(v);
       }
     }
   }
   double posTime = BytesToTime(pos);
   double readSizeTime = BytesToTime(readSize);
   NS_ASSERTION(posTime <= INT64_MAX / USECS_PER_S, "posTime overflow");
   NS_ASSERTION(readSizeTime <= INT64_MAX / USECS_PER_S, "readSizeTime overflow");
   NS_ASSERTION(frames < INT32_MAX, "frames overflow");
   mAudioQueue.Push(new AudioData(pos,
                                  static_cast<int64_t>(posTime * USECS_PER_S),
                                  static_cast<int64_t>(readSizeTime * USECS_PER_S),
                                  static_cast<int32_t>(frames),
                                  sampleBuffer.forget(),
                                  mChannels));
   return true;
 }
 bool WaveReader::DecodeVideoFrame(bool &aKeyframeSkip,
                                       int64_t aTimeThreshold)
 {
   NS_ASSERTION(mDecoder->OnDecodeThread(), "Should be on decode thread.");
   return false;
 }
 nsresult WaveReader::Seek(int64_t aTarget, int64_t aStartTime, int64_t aEndTime, int64_t aCurrentTime)
 {
   NS_ASSERTION(mDecoder->OnDecodeThread(), "Should be on decode thread.");
   LOG(PR_LOG_DEBUG, ("%p About to seek to %lld", mDecoder, aTarget));
   if (NS_FAILED(ResetDecode())) {
     return NS_ERROR_FAILURE;
   }
   double d = BytesToTime(GetDataLength());
   NS_ASSERTION(d < INT64_MAX / USECS_PER_S, "Duration overflow");
   int64_t duration = static_cast<int64_t>(d * USECS_PER_S);
   double seekTime = std::min(aTarget, duration) / static_cast<double>(USECS_PER_S);
   int64_t position = RoundDownToFrame(static_cast<int64_t>(TimeToBytes(seekTime)));
   NS_ASSERTION(INT64_MAX - mWavePCMOffset > position, "Integer overflow during wave seek");
   position += mWavePCMOffset;
   return mDecoder->GetResource()->Seek(nsISeekableStream::NS_SEEK_SET, position);
 }
 static double RoundToUsecs(double aSeconds) {
   return floor(aSeconds * USECS_PER_S) / USECS_PER_S;
 }
 nsresult WaveReader::GetBuffered(dom::TimeRanges* aBuffered, int64_t aStartTime)
 {
   if (!mInfo.HasAudio()) {
     return NS_OK;
   }
   int64_t startOffset = mDecoder->GetResource()->GetNextCachedData(mWavePCMOffset);
   while (startOffset >= 0) {
     int64_t endOffset = mDecoder->GetResource()->GetCachedDataEnd(startOffset);
     // Bytes [startOffset..endOffset] are cached.
     NS_ASSERTION(startOffset >= mWavePCMOffset, "Integer underflow in GetBuffered");
     NS_ASSERTION(endOffset >= mWavePCMOffset, "Integer underflow in GetBuffered");
     // We need to round the buffered ranges' times to microseconds so that they
     // have the same precision as the currentTime and duration attribute on
     // the media element.
     aBuffered->Add(RoundToUsecs(BytesToTime(startOffset - mWavePCMOffset)),
                    RoundToUsecs(BytesToTime(endOffset - mWavePCMOffset)));
     startOffset = mDecoder->GetResource()->GetNextCachedData(endOffset);
   }
   return NS_OK;
 }
 bool
 WaveReader::ReadAll(char* aBuf, int64_t aSize, int64_t* aBytesRead)
 {
   uint32_t got = 0;
   if (aBytesRead) {
     *aBytesRead = 0;
   }
   do {
     uint32_t read = 0;
     if (NS_FAILED(mDecoder->GetResource()->Read(aBuf + got, uint32_t(aSize - got), &read))) {
       NS_WARNING("Resource read failed");
       return false;
     }
     if (read == 0) {
       return false;
     }
     got += read;
     if (aBytesRead) {
       *aBytesRead = got;
     }
   } while (got != aSize);
   return true;
 }
 bool
 WaveReader::LoadRIFFChunk()
 {
   char riffHeader[RIFF_INITIAL_SIZE];
   const char* p = riffHeader;
   NS_ABORT_IF_FALSE(mDecoder->GetResource()->Tell() == 0,
                     "LoadRIFFChunk called when resource in invalid state");
   if (!ReadAll(riffHeader, sizeof(riffHeader))) {
     return false;
   }
   static_assert(sizeof(uint32_t) * 3 <= RIFF_INITIAL_SIZE,
                 "Reads would overflow riffHeader buffer.");
   if (ReadUint32BE(&p) != RIFF_CHUNK_MAGIC) {
     NS_WARNING("resource data not in RIFF format");
     return false;
   }
   // Skip over RIFF size field.
   p += sizeof(uint32_t);
   if (ReadUint32BE(&p) != WAVE_CHUNK_MAGIC) {
     NS_WARNING("Expected WAVE chunk");
     return false;
   }
   return true;
 }
 bool
 WaveReader::LoadFormatChunk(uint32_t aChunkSize)
 {
   uint32_t rate, channels, frameSize, sampleFormat;
   char waveFormat[WAVE_FORMAT_CHUNK_SIZE];
   const char* p = waveFormat;
   // RIFF chunks are always word (two byte) aligned.
   NS_ABORT_IF_FALSE(mDecoder->GetResource()->Tell() % 2 == 0,
                     "LoadFormatChunk called with unaligned resource");
   if (!ReadAll(waveFormat, sizeof(waveFormat))) {
     return false;
   }
   static_assert(sizeof(uint16_t) +
                 sizeof(uint16_t) +
                 sizeof(uint32_t) +
 +
                 sizeof(uint16_t) +
                 sizeof(uint16_t) <= sizeof(waveFormat),
                 "Reads would overflow waveFormat buffer.");
   if (ReadUint16LE(&p) != WAVE_FORMAT_ENCODING_PCM) {
     NS_WARNING("WAVE is not uncompressed PCM, compressed encodings are not supported");
     return false;
   }
   channels = ReadUint16LE(&p);
   rate = ReadUint32LE(&p);
   // Skip over average bytes per second field.
   p += 4;
   frameSize = ReadUint16LE(&p);
   sampleFormat = ReadUint16LE(&p);
   // PCM encoded WAVEs are not expected to have an extended "format" chunk,
   // but I have found WAVEs that have a extended "format" chunk with an
   // extension size of 0 bytes.  Be polite and handle this rather than
   // considering the file invalid.  This code skips any extension of the
   // "format" chunk.
   if (aChunkSize > WAVE_FORMAT_CHUNK_SIZE) {
     char extLength[2];
     const char* p = extLength;
     if (!ReadAll(extLength, sizeof(extLength))) {
       return false;
     }
     static_assert(sizeof(uint16_t) <= sizeof(extLength),
                   "Reads would overflow extLength buffer.");
     uint16_t extra = ReadUint16LE(&p);
     if (aChunkSize - (WAVE_FORMAT_CHUNK_SIZE + 2) != extra) {
       NS_WARNING("Invalid extended format chunk size");
       return false;
     }
     extra += extra % 2;
     if (extra > 0) {
       static_assert(UINT16_MAX + (UINT16_MAX % 2) < UINT_MAX / sizeof(char),
                     "chunkExtension array too large for iterator.");
       nsAutoArrayPtr<char> chunkExtension(new char[extra]);
       if (!ReadAll(chunkExtension.get(), extra)) {
         return false;
       }
     }
   }
   // RIFF chunks are always word (two byte) aligned.
   NS_ABORT_IF_FALSE(mDecoder->GetResource()->Tell() % 2 == 0,
                     "LoadFormatChunk left resource unaligned");
   // Make sure metadata is fairly sane.  The rate check is fairly arbitrary,
   // but the channels check is intentionally limited to mono or stereo
   // when the media is intended for direct playback because that's what the
   // audio backend currently supports.
   unsigned int actualFrameSize = (sampleFormat == 8 ? 1 : 2) * channels;
   if (rate < 100 || rate > 96000 ||
       (((channels < 1 || channels > MAX_CHANNELS) ||
        (frameSize != 1 && frameSize != 2 && frameSize != 4)) &&
        !mIgnoreAudioOutputFormat) ||
        (sampleFormat != 8 && sampleFormat != 16) ||
       frameSize != actualFrameSize) {
     NS_WARNING("Invalid WAVE metadata");
     return false;
   }
   ReentrantMonitorAutoEnter monitor(mDecoder->GetReentrantMonitor());
   mSampleRate = rate;
   mChannels = channels;
   mFrameSize = frameSize;
   if (sampleFormat == 8) {
     mSampleFormat = FORMAT_U8;
   } else {
     mSampleFormat = FORMAT_S16;
   }
   return true;
 }
 bool
 WaveReader::FindDataOffset(uint32_t aChunkSize)
 {
   // RIFF chunks are always word (two byte) aligned.
   NS_ABORT_IF_FALSE(mDecoder->GetResource()->Tell() % 2 == 0,
                     "FindDataOffset called with unaligned resource");
   int64_t offset = mDecoder->GetResource()->Tell();
   if (offset <= 0 || offset > UINT32_MAX) {
     NS_WARNING("PCM data offset out of range");
     return false;
   }
   ReentrantMonitorAutoEnter monitor(mDecoder->GetReentrantMonitor());
   mWaveLength = aChunkSize;
   mWavePCMOffset = uint32_t(offset);
   return true;
 }
 double
 WaveReader::BytesToTime(int64_t aBytes) const
 {
   NS_ABORT_IF_FALSE(aBytes >= 0, "Must be >= 0");
   return float(aBytes) / mSampleRate / mFrameSize;
 }
 int64_t
 WaveReader::TimeToBytes(double aTime) const
 {
   NS_ABORT_IF_FALSE(aTime >= 0.0f, "Must be >= 0");
   return RoundDownToFrame(int64_t(aTime * mSampleRate * mFrameSize));
 }
 int64_t
 WaveReader::RoundDownToFrame(int64_t aBytes) const
 {
   NS_ABORT_IF_FALSE(aBytes >= 0, "Must be >= 0");
   return aBytes - (aBytes % mFrameSize);
 }
 int64_t
 WaveReader::GetDataLength()
 {
   int64_t length = mWaveLength;
   // If the decoder has a valid content length, and it's shorter than the
   // expected length of the PCM data, calculate the playback duration from
   // the content length rather than the expected PCM data length.
   int64_t streamLength = mDecoder->GetResource()->GetLength();
   if (streamLength >= 0) {
     int64_t dataLength = std::max<int64_t>(0, streamLength - mWavePCMOffset);
     length = std::min(dataLength, length);
   }
   return length;
 }
 int64_t
 WaveReader::GetPosition()
 {
   return mDecoder->GetResource()->Tell();
 }
 bool
 WaveReader::GetNextChunk(uint32_t* aChunk, uint32_t* aChunkSize)
 {
   NS_ABORT_IF_FALSE(aChunk, "Must have aChunk");
   NS_ABORT_IF_FALSE(aChunkSize, "Must have aChunkSize");
   NS_ABORT_IF_FALSE(mDecoder->GetResource()->Tell() % 2 == 0,
                     "GetNextChunk called with unaligned resource");
   char chunkHeader[CHUNK_HEADER_SIZE];
   const char* p = chunkHeader;
   if (!ReadAll(chunkHeader, sizeof(chunkHeader))) {
     return false;
   }
   static_assert(sizeof(uint32_t) * 2 <= CHUNK_HEADER_SIZE,
                 "Reads would overflow chunkHeader buffer.");
   *aChunk = ReadUint32BE(&p);
   *aChunkSize = ReadUint32LE(&p);
   return true;
 }
 bool
 WaveReader::LoadListChunk(uint32_t aChunkSize,
                           nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags)
 {
   // List chunks are always word (two byte) aligned.
   NS_ABORT_IF_FALSE(mDecoder->GetResource()->Tell() % 2 == 0,
                     "LoadListChunk called with unaligned resource");
   static const unsigned int MAX_CHUNK_SIZE = 1 << 16;
   static_assert(uint64_t(MAX_CHUNK_SIZE) < UINT_MAX / sizeof(char),
                 "MAX_CHUNK_SIZE too large for enumerator.");
   if (aChunkSize > MAX_CHUNK_SIZE) {
     return false;
   }
   nsAutoArrayPtr<char> chunk(new char[aChunkSize]);
   if (!ReadAll(chunk.get(), aChunkSize)) {
     return false;
   }
   static const uint32_t INFO_LIST_MAGIC = 0x494e464f;
   const char *p = chunk.get();
   if (ReadUint32BE(&p) != INFO_LIST_MAGIC) {
     return false;
   }
   const waveIdToName ID_TO_NAME[] = {
     { 0x49415254, NS_LITERAL_CSTRING("artist") },   // IART
     { 0x49434d54, NS_LITERAL_CSTRING("comments") }, // ICMT
     { 0x49474e52, NS_LITERAL_CSTRING("genre") },    // IGNR
     { 0x494e414d, NS_LITERAL_CSTRING("name") },     // INAM
   };
   const char* const end = chunk.get() + aChunkSize;
   aTags = new dom::HTMLMediaElement::MetadataTags;
   while (p + 8 < end) {
     uint32_t id = ReadUint32BE(&p);
     // Uppercase tag id, inspired by GStreamer's Wave parser.
     id &= 0xDFDFDFDF;
     uint32_t length = ReadUint32LE(&p);
     // Subchunk shall not exceed parent chunk.
     if (p + length > end) {
       break;
     }
     // Wrap the string, adjusting length to account for optional
     // null termination in the chunk.
     nsCString val(p, length);
     if (length > 0 && val[length - 1] == '\0') {
       val.SetLength(length - 1);
     }
     // Chunks in List::INFO are always word (two byte) aligned. So round up if
     // necessary.
     length += length % 2;
     p += length;
     if (!IsUTF8(val)) {
       continue;
     }
     for (size_t i = 0; i < mozilla::ArrayLength(ID_TO_NAME); ++i) {
       if (id == ID_TO_NAME[i].id) {
         aTags->Put(ID_TO_NAME[i].name, val);
         break;
       }
     }
   }
   return true;
 }
 bool
 WaveReader::LoadAllChunks(nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags)
 {
   // Chunks are always word (two byte) aligned.
   NS_ABORT_IF_FALSE(mDecoder->GetResource()->Tell() % 2 == 0,
                     "LoadAllChunks called with unaligned resource");
   bool loadFormatChunk = false;
   bool findDataOffset = false;
   for (;;) {
     static const unsigned int CHUNK_HEADER_SIZE = 8;
     char chunkHeader[CHUNK_HEADER_SIZE];
     const char* p = chunkHeader;
     if (!ReadAll(chunkHeader, sizeof(chunkHeader))) {
       return false;
     }
     static_assert(sizeof(uint32_t) * 2 <= CHUNK_HEADER_SIZE,
                   "Reads would overflow chunkHeader buffer.");
     uint32_t magic = ReadUint32BE(&p);
     uint32_t chunkSize = ReadUint32LE(&p);
     int64_t chunkStart = GetPosition();
     switch (magic) {
       case FRMT_CHUNK_MAGIC:
         loadFormatChunk = LoadFormatChunk(chunkSize);
         if (!loadFormatChunk) {
           return false;
         }
         break;
       case LIST_CHUNK_MAGIC:
         if (!aTags) {
           LoadListChunk(chunkSize, aTags);
         }
         break;
       case DATA_CHUNK_MAGIC:
         findDataOffset = FindDataOffset(chunkSize);
         return loadFormatChunk && findDataOffset;
       default:
         break;
     }
     // RIFF chunks are two-byte aligned, so round up if necessary.
     chunkSize += chunkSize % 2;
     // Move forward to next chunk
     CheckedInt64 forward = CheckedInt64(chunkStart) + chunkSize - GetPosition();
     if (!forward.isValid() || forward.value() < 0) {
       return false;
     }
     static const int64_t MAX_CHUNK_SIZE = 1 << 16;
     static_assert(uint64_t(MAX_CHUNK_SIZE) < UINT_MAX / sizeof(char),
                   "MAX_CHUNK_SIZE too large for enumerator.");
     nsAutoArrayPtr<char> chunk(new char[MAX_CHUNK_SIZE]);
     while (forward.value() > 0) {
       int64_t size = std::min(forward.value(), MAX_CHUNK_SIZE);
       if (!ReadAll(chunk.get(), size)) {
         return false;
       }
       forward -= size;
     }
   }
   return false;
 }
 } // namespace mozilla

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content/media/wave/WaveReader.cpp@a63d609f5ebe (annotated)

content/media/wave/WaveReader.cpp