public override bool LoadStream(Stream stream)
{
Close();
_fileStream = stream;
_br = new BinaryReader(stream);
// Read in the Smacker header
_header = new Header();
_header.signature = _br.ReadUInt32BigEndian();
if (_header.signature != ScummHelper.MakeTag('S', 'M', 'K', '2') && _header.signature != ScummHelper.MakeTag('S', 'M', 'K', '4'))
{
return(false);
}
uint width = _br.ReadUInt32();
uint height = _br.ReadUInt32();
uint frameCount = _br.ReadUInt32();
int frameDelay = _br.ReadInt32();
// frame rate contains 2 digits after the comma, so 1497 is actually 14.97 fps
Rational frameRate;
if (frameDelay > 0)
{
frameRate = new Rational(1000, frameDelay);
}
else if (frameDelay < 0)
{
frameRate = new Rational(100000, -frameDelay);
}
else
{
frameRate = new Rational(1000);
}
// Flags are determined by which bit is set, which can be one of the following:
// 0 - set to 1 if file contains a ring frame.
// 1 - set to 1 if file is Y-interlaced
// 2 - set to 1 if file is Y-doubled
// If bits 1 or 2 are set, the frame should be scaled to twice its height
// before it is displayed.
_header.flags = _br.ReadUInt32();
var videoTrack = CreateVideoTrack(width, height, frameCount, frameRate, _header.flags, _header.signature);
AddTrack(videoTrack);
// TODO: should we do any extra processing for Smacker files with ring frames?
// TODO: should we do any extra processing for Y-doubled videos? Are they the
// same as Y-interlaced videos?
uint i;
for (i = 0; i < 7; ++i)
{
_header.audioSize[i] = _br.ReadUInt32();
}
_header.treesSize = _br.ReadUInt32();
_header.mMapSize = _br.ReadUInt32();
_header.mClrSize = _br.ReadUInt32();
_header.fullSize = _br.ReadUInt32();
_header.typeSize = _br.ReadUInt32();
for (i = 0; i < 7; ++i)
{
// AudioRate - Frequency and format information for each sound track, up to 7 audio tracks.
// The 32 constituent bits have the following meaning:
// * bit 31 - indicates Huffman + Dpcm compression
// * bit 30 - indicates that audio data is present for this track
// * bit 29 - 1 = 16-bit audio; 0 = 8-bit audio
// * bit 28 - 1 = stereo audio; 0 = mono audio
// * bit 27 - indicates Bink Rdft compression
// * bit 26 - indicates Bink Dct compression
// * bits 25-24 - unused
// * bits 23-0 - audio sample rate
uint audioInfo = _br.ReadUInt32();
_header.audioInfo[i].hasAudio = (audioInfo & 0x40000000) != 0;
_header.audioInfo[i].is16Bits = (audioInfo & 0x20000000) != 0;
_header.audioInfo[i].isStereo = (audioInfo & 0x10000000) != 0;
_header.audioInfo[i].sampleRate = audioInfo & 0xFFFFFF;
if ((audioInfo & 0x8000000) != 0)
{
_header.audioInfo[i].compression = AudioCompression.Rdft;
}
else if ((audioInfo & 0x4000000) != 0)
{
_header.audioInfo[i].compression = AudioCompression.Dct;
}
else if ((audioInfo & 0x80000000) != 0)
{
_header.audioInfo[i].compression = AudioCompression.Dpcm;
}
else
{
_header.audioInfo[i].compression = AudioCompression.None;
}
if (_header.audioInfo[i].hasAudio)
{
if (_header.audioInfo[i].compression == AudioCompression.Rdft || _header.audioInfo[i].compression == AudioCompression.Dct)
{
throw new InvalidOperationException("Unhandled Smacker v2 audio compression");
}
AddTrack(new SmackerAudioTrack(_mixer, _header.audioInfo[i], _soundType));
}
}
_header.dummy = _br.ReadUInt32();
_frameSizes = new uint[frameCount];
for (i = 0; i < frameCount; ++i)
{
_frameSizes[i] = _br.ReadUInt32();
}
_frameTypes = new byte[frameCount];
for (i = 0; i < frameCount; ++i)
{
_frameTypes[i] = _br.ReadByte();
}
var huffmanTrees = _br.ReadBytes((int)_header.treesSize);
using (var ms = new MemoryStream(huffmanTrees))
{
var bs = BitStream.Create8Lsb(ms);
videoTrack.ReadTrees(bs, (int)_header.mMapSize, (int)_header.mClrSize, (int)_header.fullSize, (int)_header.typeSize);
}
_firstFrameStart = (uint)_fileStream.Position;
return(true);
}
public void QueueCompressedBuffer(byte[] buffer, int bufferSize, int unpackedSize)
{
using (var ms = new MemoryStream(buffer, 0, bufferSize))
{
var audioBS = BitStream.Create8Lsb(ms);
bool dataPresent = audioBS.GetBit() != 0;
if (!dataPresent)
{
return;
}
bool isStereo = audioBS.GetBit() != 0;
Debug.Assert(isStereo == _audioInfo.isStereo);
bool is16Bits = audioBS.GetBit() != 0;
Debug.Assert(is16Bits == _audioInfo.is16Bits);
int numBytes = 1 * (isStereo ? 2 : 1) * (is16Bits ? 2 : 1);
byte[] unpackedBuffer = new byte[unpackedSize];
var curPointer = 0;
var curPos = 0;
SmallHuffmanTree[] audioTrees = new SmallHuffmanTree[4];
for (int k = 0; k < numBytes; k++)
{
audioTrees[k] = new SmallHuffmanTree(audioBS);
}
// Base values, stored as big endian
int[] bases = new int[2];
if (isStereo)
{
if (is16Bits)
{
bases[1] = ScummHelper.SwapBytes((ushort)audioBS.GetBits(16));
}
else
{
bases[1] = (int)audioBS.GetBits(8);
}
}
if (is16Bits)
{
bases[0] = ScummHelper.SwapBytes((ushort)audioBS.GetBits(16));
}
else
{
bases[0] = (int)audioBS.GetBits(8);
}
// The bases are the first samples, too
for (int i = 0;
i < (isStereo ? 2 : 1);
i++, curPointer += (is16Bits ? 2 : 1), curPos += (is16Bits ? 2 : 1))
{
if (is16Bits)
{
unpackedBuffer.WriteUInt16BigEndian(curPointer, (ushort)bases[i]);
}
else
{
unpackedBuffer[curPointer] = (byte)((bases[i] & 0xFF) ^ 0x80);
}
}
// Next follow the deltas, which are added to the corresponding base values and
// are stored as little endian
// We store the unpacked bytes in big endian format
while (curPos < unpackedSize)
{
// If the sample is stereo, the data is stored for the left and right channel, respectively
// (the exact opposite to the base values)
if (!is16Bits)
{
for (int k = 0; k < (isStereo ? 2 : 1); k++)
{
sbyte delta = (sbyte)((short)audioTrees[k].GetCode(audioBS));
bases[k] = (bases[k] + delta) & 0xFF;
unpackedBuffer[curPointer++] = (byte)(bases[k] ^ 0x80);
curPos++;
}
}
else
{
for (int k = 0; k < (isStereo ? 2 : 1); k++)
{
byte lo = (byte)audioTrees[k * 2].GetCode(audioBS);
byte hi = (byte)audioTrees[k * 2 + 1].GetCode(audioBS);
bases[k] += (short)(lo | (hi << 8));
unpackedBuffer.WriteUInt16BigEndian(curPointer, (ushort)bases[k]);
curPointer += 2;
curPos += 2;
}
}
}
QueuePCM(unpackedBuffer, unpackedSize);
}
}
protected override void ReadNextPacket()
{
var videoTrack = (SmackerVideoTrack)GetTrack(0);
if (videoTrack.EndOfTrack)
{
return;
}
videoTrack.IncreaseCurrentFrame();
int i;
uint chunkSize = 0;
uint dataSizeUnpacked = 0;
uint startPos = (uint)_fileStream.Position;
// Check if we got a frame with palette data, and
// call back the virtual setPalette function to set
// the current palette
if ((_frameTypes[videoTrack.CurrentFrame] & 1) != 0)
{
videoTrack.UnpackPalette(_fileStream);
}
// Load audio tracks
for (i = 0; i < 7; ++i)
{
if ((_frameTypes[videoTrack.CurrentFrame] & (2 << i)) == 0)
{
continue;
}
chunkSize = _br.ReadUInt32();
chunkSize -= 4; // subtract the first 4 bytes (chunk size)
if (_header.audioInfo[i].compression == AudioCompression.None)
{
dataSizeUnpacked = chunkSize;
}
else
{
dataSizeUnpacked = _br.ReadUInt32();
chunkSize -= 4; // subtract the next 4 bytes (unpacked data size)
}
HandleAudioTrack((byte)i, (int)chunkSize, (int)dataSizeUnpacked);
}
uint frameSize = (uint)(_frameSizes[videoTrack.CurrentFrame] & ~3);
// uint32 remainder = _frameSizes[videoTrack.getCurFrame()] & 3;
if (_fileStream.Position - startPos > frameSize)
{
throw new InvalidOperationException("Smacker actual frame size exceeds recorded frame size");
}
uint frameDataSize = (uint)(frameSize - (_fileStream.Position - startPos));
var frameData = new byte[frameDataSize + 1];
// Padding to keep the BigHuffmanTrees from reading past the data end
frameData[frameDataSize] = 0x00;
_fileStream.Read(frameData, 0, (int)frameDataSize);
using (var ms = new MemoryStream(frameData, 0, (int)(frameDataSize + 1)))
{
var bs = BitStream.Create8Lsb(ms);
videoTrack.DecodeFrame(bs);
}
_fileStream.Seek(startPos + frameSize, SeekOrigin.Begin);
}
