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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <algorithm>
#include "mozilla/EndianUtils.h"
#include "OpusParser.h"
#include "VideoUtils.h"
#include "opus/opus.h"
extern "C" {
#include "opus/opus_multistream.h"
}
namespace mozilla {
extern LazyLogModule gMediaDecoderLog;
#define OPUS_LOG(type, msg) MOZ_LOG(gMediaDecoderLog, type, msg)
OpusParser::OpusParser():
mRate(0),
mNominalRate(0),
mChannels(0),
mPreSkip(0),
#ifdef MOZ_SAMPLE_TYPE_FLOAT32
mGain(1.0f),
#else
mGain_Q16(65536),
#endif
mChannelMapping(0),
mStreams(0),
mCoupledStreams(0)
{ }
bool OpusParser::DecodeHeader(unsigned char* aData, size_t aLength)
{
if (aLength < 19 || memcmp(aData, "OpusHead", 8)) {
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: unrecognized header"));
return false;
}
mRate = 48000; // The Opus decoder runs at 48 kHz regardless.
int version = aData[8];
// Accept file format versions 0.x.
if ((version & 0xf0) != 0) {
OPUS_LOG(LogLevel::Debug, ("Rejecting unknown Opus file version %d", version));
return false;
}
mChannels = aData[9];
if (mChannels<1) {
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: Number of channels %d", mChannels));
return false;
}
mPreSkip = LittleEndian::readUint16(aData + 10);
mNominalRate = LittleEndian::readUint32(aData + 12);
double gain_dB = LittleEndian::readInt16(aData + 16) / 256.0;
#ifdef MOZ_SAMPLE_TYPE_FLOAT32
mGain = static_cast<float>(pow(10,0.05*gain_dB));
#else
mGain_Q16 = static_cast<int32_t>(std::min(65536*pow(10,0.05*gain_dB)+0.5,
static_cast<double>(INT32_MAX)));
#endif
mChannelMapping = aData[18];
if (mChannelMapping == 0) {
// Mapping family 0 only allows two channels
if (mChannels>2) {
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: too many channels (%d) for"
" mapping family 0.", mChannels));
return false;
}
mStreams = 1;
mCoupledStreams = mChannels - 1;
mMappingTable[0] = 0;
mMappingTable[1] = 1;
} else if (mChannelMapping == 1 || mChannelMapping == 255) {
// Currently only up to 8 channels are defined for mapping family 1 and we
// only supports only up to 8 channels for mapping family 255.
if (mChannels>8) {
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: too many channels (%d) for"
" mapping family 1.", mChannels));
return false;
}
if (aLength>static_cast<unsigned>(20+mChannels)) {
mStreams = aData[19];
mCoupledStreams = aData[20];
int i;
for (i=0; i<mChannels; i++)
mMappingTable[i] = aData[21+i];
} else {
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: channel mapping %d,"
" but no channel mapping table", mChannelMapping));
return false;
}
} else {
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: unsupported channel mapping "
"family %d", mChannelMapping));
return false;
}
if (mStreams < 1) {
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: no streams"));
return false;
}
if (mCoupledStreams > mStreams) {
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: more coupled streams (%d) than "
"total streams (%d)", mCoupledStreams, mStreams));
return false;
}
#ifdef DEBUG
OPUS_LOG(LogLevel::Debug, ("Opus stream header:"));
OPUS_LOG(LogLevel::Debug, (" channels: %d", mChannels));
OPUS_LOG(LogLevel::Debug, (" preskip: %d", mPreSkip));
OPUS_LOG(LogLevel::Debug, (" original: %d Hz", mNominalRate));
OPUS_LOG(LogLevel::Debug, (" gain: %.2f dB", gain_dB));
OPUS_LOG(LogLevel::Debug, ("Channel Mapping:"));
OPUS_LOG(LogLevel::Debug, (" family: %d", mChannelMapping));
OPUS_LOG(LogLevel::Debug, (" streams: %d", mStreams));
#endif
return true;
}
bool OpusParser::DecodeTags(unsigned char* aData, size_t aLength)
{
if (aLength < 16 || memcmp(aData, "OpusTags", 8))
return false;
// Copy out the raw comment lines, but only do basic validation
// checks against the string packing: too little data, too many
// comments, or comments that are too long. Rejecting these cases
// helps reduce the propagation of broken files.
// We do not ensure they are valid UTF-8 here, nor do we validate
// the required ASCII_TAG=value format of the user comments.
const unsigned char* buf = aData + 8;
uint32_t bytes = aLength - 8;
uint32_t len;
// Read the vendor string.
len = LittleEndian::readUint32(buf);
buf += 4;
bytes -= 4;
if (len > bytes)
return false;
mVendorString = nsCString(reinterpret_cast<const char*>(buf), len);
buf += len;
bytes -= len;
// Read the user comments.
if (bytes < 4)
return false;
uint32_t ncomments = LittleEndian::readUint32(buf);
buf += 4;
bytes -= 4;
// If there are so many comments even their length fields
// won't fit in the packet, stop reading now.
if (ncomments > (bytes>>2))
return false;
for (uint32_t i = 0; i < ncomments; i++) {
if (bytes < 4)
return false;
len = LittleEndian::readUint32(buf);
buf += 4;
bytes -= 4;
if (len > bytes)
return false;
mTags.AppendElement(nsCString(reinterpret_cast<const char*>(buf), len));
buf += len;
bytes -= len;
}
#ifdef DEBUG
OPUS_LOG(LogLevel::Debug, ("Opus metadata header:"));
OPUS_LOG(LogLevel::Debug, (" vendor: %s", mVendorString.get()));
for (uint32_t i = 0; i < mTags.Length(); i++) {
OPUS_LOG(LogLevel::Debug, (" %s", mTags[i].get()));
}
#endif
return true;
}
} // namespace mozilla
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