зеркало из https://github.com/mozilla/gecko-dev.git
218 строки
7.0 KiB
C++
218 строки
7.0 KiB
C++
/* -*- 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"
|
|
}
|
|
|
|
#include <cmath>
|
|
|
|
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),
|
|
mPrevPacketGranulepos(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 == 2 ||
|
|
mChannelMapping == 255) {
|
|
// Currently only up to 8 channels are defined for mapping family 1
|
|
if (mChannelMapping == 1 && mChannels > 8) {
|
|
OPUS_LOG(LogLevel::Debug, ("Invalid Opus file: too many channels (%d) for"
|
|
" mapping family 1.",
|
|
mChannels));
|
|
return false;
|
|
}
|
|
if (mChannelMapping == 2) {
|
|
if (!IsValidMapping2ChannelsCount(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;
|
|
}
|
|
|
|
/* static */
|
|
bool OpusParser::IsValidMapping2ChannelsCount(uint8_t aChannels) {
|
|
// https://tools.ietf.org/html/draft-ietf-codec-ambisonics-08#page-4
|
|
// For both channel mapping family 2 and family 3, the allowed numbers
|
|
// of channels: (1 + n)^2 + 2j for n = 0, 1, ..., 14 and j = 0 or 1,
|
|
// where n denotes the (highest) ambisonic order and j denotes whether
|
|
// or not there is a separate non-diegetic stereo stream Explicitly the
|
|
// allowed number of channels are 1, 3, 4, 6, 9, 11, 16, 18, 25, 27, 36,
|
|
// 38, 49, 51, 64, 66, 81, 83, 100, 102, 121, 123, 144, 146, 169, 171,
|
|
// 196, 198, 225, and 227.
|
|
|
|
// We use the property that int(sqrt(n)) == int(sqrt(n+2)) for n != 3
|
|
// which is handled by the test n^2 + 2 != channel
|
|
if (aChannels < 1 || aChannels > 227) {
|
|
return false;
|
|
}
|
|
double val = sqrt(aChannels);
|
|
int32_t valInt = int32_t(val);
|
|
return val == valInt || valInt * valInt + 2 == aChannels;
|
|
}
|
|
|
|
#undef OPUS_LOG
|
|
|
|
} // namespace mozilla
|