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