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raze/source/common/cutscenes/playmve.cpp

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/*
* InterplayDecoder
* Copyright (C) 2020 sirlemonhead
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* This code is based on interplayvideo.c, dpcm.c and ipmovie.c from the FFmpeg project which can be obtained
* from http://www.ffmpeg.org/. Below is the license from interplayvideo.c
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Interplay MVE Video Decoder
* Copyright (C) 2003 The FFmpeg project
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <algorithm>
#include "playmve.h"
#include "printf.h"
#include "v_draw.h"
#include "s_music.h"
#include "cmdlib.h"
static const int16_t delta_table[] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 47, 51, 56, 61,
66, 72, 79, 86, 94, 102, 112, 122,
133, 145, 158, 173, 189, 206, 225, 245,
267, 292, 318, 348, 379, 414, 452, 493,
538, 587, 640, 699, 763, 832, 908, 991,
1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993,
2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008,
4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059,
8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206,
17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589,
-29973, -26728, -23186, -19322, -15105, -10503, -5481, -1,
1, 1, 5481, 10503, 15105, 19322, 23186, 26728,
29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298,
-17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597,
-8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772,
-4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373,
-2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180,
-1081, -991, -908, -832, -763, -699, -640, -587,
-538, -493, -452, -414, -379, -348, -318, -292,
-267, -245, -225, -206, -189, -173, -158, -145,
-133, -122, -112, -102, -94, -86, -79, -72,
-66, -61, -56, -51, -47, -43, -42, -41,
-40, -39, -38, -37, -36, -35, -34, -33,
-32, -31, -30, -29, -28, -27, -26, -25,
-24, -23, -22, -21, -20, -19, -18, -17,
-16, -15, -14, -13, -12, -11, -10, -9,
-8, -7, -6, -5, -4, -3, -2, -1
};
// macro to fetch 16-bit little-endian words from a bytestream
#define LE_16(x) ((*x) | ((*(x+1)) << 8))
static bool StreamCallbackFunc(SoundStream* stream, void* buff, int len, void* userdata)
{
InterplayDecoder* pId = (InterplayDecoder*)userdata;
memcpy(buff, &pId->audio.samples[pId->audio.nRead], len);
pId->audio.nRead += len / 2;
if (pId->audio.nRead >= (int)countof(pId->audio.samples)) pId->audio.nRead = 0;
return true;
}
InterplayDecoder::InterplayDecoder(bool soundenabled)
{
bIsPlaying = false;
bAudioStarted = !soundenabled; // This prevents the stream from getting created
nWidth = 0;
nHeight = 0;
nFrame = 0;
memset(palette, 0, sizeof(palette));
memset(&audio, 0, sizeof(audio));
audio.nRead = 18000; // skip the initial silence. This is needed to sync audio and video because OpenAL's lag is a bit on the high side.
nFps = 0.0;
nFrameDuration = 0;
nTimerRate = 0;
nTimerDiv = 0;
pVideoBuffers[0] = nullptr;
pVideoBuffers[1] = nullptr;
decodeMap.pData = nullptr;
decodeMap.nSize = 0;
nCurrentVideoBuffer = 0;
nPreviousVideoBuffer = 1;
videoStride = 0;
}
InterplayDecoder::~InterplayDecoder()
{
Close();
}
void InterplayDecoder::SwapFrames()
{
int t = nPreviousVideoBuffer;
nPreviousVideoBuffer = nCurrentVideoBuffer;
nCurrentVideoBuffer = t;
}
void InterplayDecoder::Close()
{
fr.Close();
bIsPlaying = false;
if (stream)
S_StopCustomStream(stream);
stream = nullptr;
if (decodeMap.pData) {
delete[] decodeMap.pData;
decodeMap.pData = nullptr;
}
if (pVideoBuffers[0]) {
delete[] pVideoBuffers[0];
pVideoBuffers[0] = nullptr;
}
if (pVideoBuffers[1]) {
delete[] pVideoBuffers[1];
pVideoBuffers[1] = nullptr;
}
}
bool InterplayDecoder::Open(FileReader &fr_)
{
// open the file (read only)
char lsig[20];
// check the file signature
fr_.Read((uint8_t*)lsig, sizeof(lsig));
if (memcmp(lsig, "Interplay MVE File\x1A\0", sizeof(lsig)) != 0)
{
Printf(TEXTCOLOR_RED "InterplayDecoder: Unknown MVE signature\n ");
return false;
}
// skip the next 6 bytes
fr_.Seek(6, FileReader::SeekCur);
fr = std::move(fr_);
//Run();
return true;
}
bool InterplayDecoder::RunFrame(uint64_t clock)
{
uint8_t chunkPreamble[CHUNK_PREAMBLE_SIZE];
uint8_t opcodePreamble[OPCODE_PREAMBLE_SIZE];
uint8_t opcodeType;
uint8_t opcodeVersion;
int opcodeSize, chunkSize;
int chunkType = 0;
// iterate through the chunks in the file
do
{
// handle timing - wait until we're ready to process the next frame.
if (nNextFrameTime > clock) {
return true;
}
else {
nNextFrameTime += nFrameDuration;
}
if (fr.Read(chunkPreamble, CHUNK_PREAMBLE_SIZE) != CHUNK_PREAMBLE_SIZE) {
Printf(TEXTCOLOR_RED "InterplayDecoder: could not read from file (EOF?)\n");
return false;
}
chunkSize = LE_16(&chunkPreamble[0]);
chunkType = LE_16(&chunkPreamble[2]);
// iterate through individual opcodes
while (chunkSize > 0)
{
if (fr.Read(opcodePreamble, OPCODE_PREAMBLE_SIZE) != OPCODE_PREAMBLE_SIZE)
{
Printf(TEXTCOLOR_RED "InterplayDecoder: could not read from file (EOF?)\n");
return false;
}
opcodeSize = LE_16(&opcodePreamble[0]);
opcodeType = opcodePreamble[2];
opcodeVersion = opcodePreamble[3];
chunkSize -= OPCODE_PREAMBLE_SIZE;
chunkSize -= opcodeSize;
switch (opcodeType)
{
case OPCODE_END_OF_STREAM:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
break;
}
case OPCODE_END_OF_CHUNK:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
break;
}
case OPCODE_CREATE_TIMER:
{
nTimerRate = fr.ReadUInt32();
nTimerDiv = fr.ReadUInt16();
nFrameDuration = ((uint64_t)nTimerRate * nTimerDiv) * 1000;
break;
}
case OPCODE_INIT_AUDIO_BUFFERS:
{
fr.Seek(2, FileReader::SeekCur);
uint16_t flags = fr.ReadUInt16();
audio.nSampleRate = fr.ReadUInt16();
uint32_t nBufferBytes;
if (opcodeVersion == 0) {
nBufferBytes = fr.ReadUInt16();
}
else {
nBufferBytes = fr.ReadUInt32();
}
if (flags & 0x1) {
audio.nChannels = 2;
}
else {
audio.nChannels = 1;
}
if (flags & 0x2) {
audio.nBitDepth = 16;
}
else {
audio.nBitDepth = 8;
}
break;
}
case OPCODE_START_STOP_AUDIO:
{
if (!bAudioStarted)
{
// start audio playback
stream = S_CreateCustomStream(6000, audio.nSampleRate, audio.nChannels, StreamCallbackFunc, this);
bAudioStarted = true;
}
fr.Seek(opcodeSize, FileReader::SeekCur);
break;
}
case OPCODE_INIT_VIDEO_BUFFERS:
{
assert(opcodeSize == 8);
nWidth = fr.ReadUInt16() * 8;
nHeight = fr.ReadUInt16() * 8;
int count = fr.ReadUInt16();
int truecolour = fr.ReadUInt16();
assert(truecolour == 0);
pVideoBuffers[0] = new uint8_t[nWidth * nHeight];
pVideoBuffers[1] = new uint8_t[nWidth * nHeight];
videoStride = nWidth;
animtex.SetSize(AnimTexture::Paletted, nWidth, nHeight);
break;
}
case OPCODE_UNKNOWN_06:
case OPCODE_UNKNOWN_0E:
case OPCODE_UNKNOWN_10:
case OPCODE_UNKNOWN_12:
case OPCODE_UNKNOWN_13:
case OPCODE_UNKNOWN_14:
case OPCODE_UNKNOWN_15:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
break;
}
case OPCODE_SEND_BUFFER:
{
int nPalStart = fr.ReadUInt16();
int nPalCount = fr.ReadUInt16();
animtex.SetFrame(&palette[0].r , GetCurrentFrame());
nFrame++;
SwapFrames();
fr.Seek(opcodeSize-4, FileReader::SeekCur);
break;
}
case OPCODE_AUDIO_FRAME:
{
int nStart = (int)fr.Tell();
uint16_t seqIndex = fr.ReadUInt16();
uint16_t streamMask = fr.ReadUInt16();
uint16_t nSamples = fr.ReadUInt16(); // number of samples this chunk
int predictor[2];
int i = 0;
for (int ch = 0; ch < audio.nChannels; ch++)
{
predictor[ch] = fr.ReadUInt16();
i++;
if (predictor[ch] & 0x8000) {
predictor[ch] |= 0xFFFF0000; // sign extend
}
audio.samples[audio.nWrite++] = predictor[ch];
if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
}
int ch = 0;
for (; i < (nSamples / 2); i++)
{
predictor[ch] += delta_table[fr.ReadUInt8()];
predictor[ch] = clamp(predictor[ch], -32768, 32768);
audio.samples[audio.nWrite++] = predictor[ch];
if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
// toggle channel
ch ^= audio.nChannels - 1;
}
int nEnd = (int)fr.Tell();
int nRead = nEnd - nStart;
assert(opcodeSize == nRead);
break;
}
case OPCODE_SILENCE_FRAME:
{
uint16_t seqIndex = fr.ReadUInt16();
uint16_t streamMask = fr.ReadUInt16();
uint16_t nStreamLen = fr.ReadUInt16();
break;
}
case OPCODE_INIT_VIDEO_MODE:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
break;
}
case OPCODE_CREATE_GRADIENT:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
Printf("InterplayDecoder: Create gradient not supported.\n");
break;
}
case OPCODE_SET_PALETTE:
{
if (opcodeSize > 0x304 || opcodeSize < 4) {
Printf("set_palette opcode with invalid size\n");
chunkType = CHUNK_BAD;
break;
}
int nPalStart = fr.ReadUInt16();
int nPalCount = fr.ReadUInt16();
for (int i = nPalStart; i <= nPalCount; i++)
{
palette[i].r = fr.ReadUInt8() << 2;
palette[i].g = fr.ReadUInt8() << 2;
palette[i].b = fr.ReadUInt8() << 2;
}
break;
}
case OPCODE_SET_PALETTE_COMPRESSED:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
Printf("InterplayDecoder: Set palette compressed not supported.\n");
break;
}
case OPCODE_SET_DECODING_MAP:
{
if (!decodeMap.pData)
{
decodeMap.pData = new uint8_t[opcodeSize];
decodeMap.nSize = opcodeSize;
}
else
{
if (opcodeSize != (int)decodeMap.nSize) {
delete[] decodeMap.pData;
decodeMap.pData = new uint8_t[opcodeSize];
decodeMap.nSize = opcodeSize;
}
}
int nRead = (int)fr.Read(decodeMap.pData, opcodeSize);
assert(nRead == opcodeSize);
break;
}
case OPCODE_VIDEO_DATA:
{
int nStart = (int)fr.Tell();
// need to skip 14 bytes
fr.Seek(14, FileReader::SeekCur);
if (decodeMap.nSize)
{
int i = 0;
for (uint32_t y = 0; y < nHeight; y += 8)
{
for (uint32_t x = 0; x < nWidth; x += 8)
{
uint32_t opcode;
// alternate between getting low and high 4 bits
if (i & 1) {
opcode = decodeMap.pData[i >> 1] >> 4;
}
else {
opcode = decodeMap.pData[i >> 1] & 0x0F;
}
i++;
int32_t offset = x + (y * videoStride);
switch (opcode)
{
default:
break;
case 0:
DecodeBlock0(offset);
break;
case 1:
DecodeBlock1(offset);
break;
case 2:
DecodeBlock2(offset);
break;
case 3:
DecodeBlock3(offset);
break;
case 4:
DecodeBlock4(offset);
break;
case 5:
DecodeBlock5(offset);
break;
case 7:
DecodeBlock7(offset);
break;
case 8:
DecodeBlock8(offset);
break;
case 9:
DecodeBlock9(offset);
break;
case 10:
DecodeBlock10(offset);
break;
case 11:
DecodeBlock11(offset);
break;
case 12:
DecodeBlock12(offset);
break;
case 13:
DecodeBlock13(offset);
break;
case 14:
DecodeBlock14(offset);
break;
case 15:
DecodeBlock15(offset);
break;
}
}
}
}
int nEnd = (int)fr.Tell();
int nSkipBytes = opcodeSize - (nEnd - nStart); // we can end up with 1 byte left we need to skip
assert(nSkipBytes <= 1);
fr.Seek(nSkipBytes, FileReader::SeekCur);
break;
}
default:
break;
}
}
}
while (chunkType < CHUNK_VIDEO && bIsPlaying);
return chunkType != CHUNK_END;
}
void InterplayDecoder::CopyBlock(uint8_t* pDest, uint8_t* pSrc)
{
for (int y = 0; y < 8; y++)
{
memcpy(pDest, pSrc, 8);
pSrc += (intptr_t)videoStride;
pDest += (intptr_t)videoStride;
}
}
void InterplayDecoder::DecodeBlock0(int32_t offset)
{
// copy from the same offset but from the previous frame
uint8_t* pDest = GetCurrentFrame() + (intptr_t)offset;
uint8_t* pSrc = GetPreviousFrame() + (intptr_t)offset;
CopyBlock(pDest, pSrc);
}
void InterplayDecoder::DecodeBlock1(int32_t offset)
{
// nothing to do for this.
}
void InterplayDecoder::DecodeBlock2(int32_t offset)
{
// copy block from 2 frames ago using a motion vector; need 1 more byte
uint8_t B = fr.ReadUInt8();
int x, y;
if (B < 56) {
x = 8 + (B % 7);
y = B / 7;
}
else {
x = -14 + ((B - 56) % 29);
y = 8 + ((B - 56) / 29);
}
uint8_t* pDest = GetCurrentFrame() + (intptr_t)offset;
uint8_t* pSrc = GetCurrentFrame() + (intptr_t)(int64_t)offset + (int64_t)x + (int64_t(y) * (int64_t)videoStride);
CopyBlock(pDest, pSrc);
}
void InterplayDecoder::DecodeBlock3(int32_t offset)
{
// copy 8x8 block from current frame from an up/left block
uint8_t B = fr.ReadUInt8();
int x, y;
// need 1 more byte for motion
if (B < 56) {
x = -(8 + (B % 7));
y = -(B / 7);
}
else {
x = -(-14 + ((B - 56) % 29));
y = -(8 + ((B - 56) / 29));
}
uint8_t* pDest = GetCurrentFrame() + (intptr_t)offset;
uint8_t* pSrc = GetCurrentFrame() + (intptr_t)(int64_t)offset + (int64_t)x + (int64_t(y) * (int64_t)videoStride);
CopyBlock(pDest, pSrc);
}
void InterplayDecoder::DecodeBlock4(int32_t offset)
{
// copy a block from the previous frame; need 1 more byte
int x, y;
uint8_t B, BL, BH;
B = fr.ReadUInt8();
BL = B & 0x0F;
BH = (B >> 4) & 0x0F;
x = -8 + BL;
y = -8 + BH;
uint8_t* pDest = GetCurrentFrame() + (intptr_t)offset;
uint8_t* pSrc = GetPreviousFrame() + (intptr_t)(int64_t)offset + (int64_t)x + (int64_t(y) * (int64_t)videoStride);
CopyBlock(pDest, pSrc);
}
void InterplayDecoder::DecodeBlock5(int32_t offset)
{
// copy a block from the previous frame using an expanded range; need 2 more bytes
int8_t x = fr.ReadUInt8();
int8_t y = fr.ReadUInt8();
uint8_t* pDest = GetCurrentFrame() + (intptr_t)offset;
uint8_t* pSrc = GetPreviousFrame() + (intptr_t)(int64_t)offset + (int64_t)x + (int64_t(y) * (int64_t)videoStride);
CopyBlock(pDest, pSrc);
}
// Block6 is unknown and skipped
void InterplayDecoder::DecodeBlock7(int32_t offset)
{
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint32_t flags = 0;
uint8_t P[2];
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
// 2-color encoding
if (P[0] <= P[1])
{
// need 8 more bytes from the stream
for (int y = 0; y < 8; y++)
{
flags = fr.ReadUInt8() | 0x100;
for (; flags != 1; flags >>= 1) {
*pBuffer++ = P[flags & 1];
}
pBuffer += (videoStride - 8);
}
}
else
{
// need 2 more bytes from the stream
flags = fr.ReadUInt16();
for (int y = 0; y < 8; y += 2)
{
for (int x = 0; x < 8; x += 2, flags >>= 1)
{
pBuffer[x] =
pBuffer[x + 1] =
pBuffer[x + videoStride] =
pBuffer[x + 1 + videoStride] = P[flags & 1];
}
pBuffer += videoStride * 2;
}
}
}
void InterplayDecoder::DecodeBlock8(int32_t offset)
{
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint32_t flags = 0;
uint8_t P[4];
// 2-color encoding for each 4x4 quadrant, or 2-color encoding on either top and bottom or left and right halves
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
if (P[0] <= P[1])
{
for (int y = 0; y < 16; y++)
{
// new values for each 4x4 block
if (!(y & 3))
{
if (y) {
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
}
flags = fr.ReadUInt16();
}
for (int x = 0; x < 4; x++, flags >>= 1) {
*pBuffer++ = P[flags & 1];
}
pBuffer += videoStride - 4;
// switch to right half
if (y == 7) pBuffer -= 8 * videoStride - 4;
}
}
else
{
flags = fr.ReadUInt32();
P[2] = fr.ReadUInt8();
P[3] = fr.ReadUInt8();
if (P[2] <= P[3])
{
// vertical split; left & right halves are 2-color encoded
for (int y = 0; y < 16; y++)
{
for (int x = 0; x < 4; x++, flags >>= 1) {
*pBuffer++ = P[flags & 1];
}
pBuffer += videoStride - 4;
// switch to right half
if (y == 7) {
pBuffer -= 8 * videoStride - 4;
P[0] = P[2];
P[1] = P[3];
flags = fr.ReadUInt32();
}
}
}
else
{
// horizontal split; top & bottom halves are 2-color encoded
for (int y = 0; y < 8; y++)
{
if (y == 4) {
P[0] = P[2];
P[1] = P[3];
flags = fr.ReadUInt32();
}
for (int x = 0; x < 8; x++, flags >>= 1)
*pBuffer++ = P[flags & 1];
pBuffer += (videoStride - 8);
}
}
}
}
void InterplayDecoder::DecodeBlock9(int32_t offset)
{
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint8_t P[4];
fr.Read(P, 4);
// 4-color encoding
if (P[0] <= P[1])
{
if (P[2] <= P[3])
{
// 1 of 4 colors for each pixel, need 16 more bytes
for (int y = 0; y < 8; y++)
{
// get the next set of 8 2-bit flags
int flags = fr.ReadUInt16();
for (int x = 0; x < 8; x++, flags >>= 2) {
*pBuffer++ = P[flags & 0x03];
}
pBuffer += (videoStride - 8);
}
}
else
{
// 1 of 4 colors for each 2x2 block, need 4 more bytes
uint32_t flags = fr.ReadUInt32();
for (int y = 0; y < 8; y += 2)
{
for (int x = 0; x < 8; x += 2, flags >>= 2)
{
pBuffer[x] =
pBuffer[x + 1] =
pBuffer[x + videoStride] =
pBuffer[x + 1 + videoStride] = P[flags & 0x03];
}
pBuffer += videoStride * 2;
}
}
}
else
{
// 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes
uint64_t flags = fr.ReadUInt64();
if (P[2] <= P[3])
{
for (int y = 0; y < 8; y++)
{
for (int x = 0; x < 8; x += 2, flags >>= 2)
{
pBuffer[x] =
pBuffer[x + 1] = P[flags & 0x03];
}
pBuffer += videoStride;
}
}
else
{
for (int y = 0; y < 8; y += 2)
{
for (int x = 0; x < 8; x++, flags >>= 2)
{
pBuffer[x] =
pBuffer[x + videoStride] = P[flags & 0x03];
}
pBuffer += videoStride * 2;
}
}
}
}
void InterplayDecoder::DecodeBlock10(int32_t offset)
{
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint8_t P[8];
fr.Read(P, 4);
// 4-color encoding for each 4x4 quadrant, or 4-color encoding on either top and bottom or left and right halves
if (P[0] <= P[1])
{
int flags = 0;
// 4-color encoding for each quadrant; need 32 bytes
for (int y = 0; y < 16; y++)
{
// new values for each 4x4 block
if (!(y & 3)) {
if (y) fr.Read(P, 4);
flags = fr.ReadUInt32();
}
for (int x = 0; x < 4; x++, flags >>= 2) {
*pBuffer++ = P[flags & 0x03];
}
pBuffer += videoStride - 4;
// switch to right half
if (y == 7) pBuffer -= 8 * videoStride - 4;
}
}
else
{
// vertical split?
int vert;
uint64_t flags = fr.ReadUInt64();
fr.Read(P + 4, 4);
vert = P[4] <= P[5];
// 4-color encoding for either left and right or top and bottom halves
for (int y = 0; y < 16; y++)
{
for (int x = 0; x < 4; x++, flags >>= 2)
*pBuffer++ = P[flags & 0x03];
if (vert)
{
pBuffer += videoStride - 4;
// switch to right half
if (y == 7) pBuffer -= 8 * videoStride - 4;
}
else if (y & 1) pBuffer += (videoStride - 8);
// load values for second half
if (y == 7) {
memcpy(P, P + 4, 4);
flags = fr.ReadUInt64();
}
}
}
}
void InterplayDecoder::DecodeBlock11(int32_t offset)
{
// 64-color encoding (each pixel in block is a different color)
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
for (int y = 0; y < 8; y++)
{
fr.Read(pBuffer, 8);
pBuffer += videoStride;
}
}
void InterplayDecoder::DecodeBlock12(int32_t offset)
{
// 16-color block encoding: each 2x2 block is a different color
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
for (int y = 0; y < 8; y += 2)
{
for (int x = 0; x < 8; x += 2)
{
pBuffer[x] =
pBuffer[x + 1] =
pBuffer[x + videoStride] =
pBuffer[x + 1 + videoStride] = fr.ReadUInt8();
}
pBuffer += videoStride * 2;
}
}
void InterplayDecoder::DecodeBlock13(int32_t offset)
{
// 4-color block encoding: each 4x4 block is a different color
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint8_t P[2] = {};
for (int y = 0; y < 8; y++)
{
if (!(y & 3))
{
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
}
memset(pBuffer, P[0], 4);
memset(pBuffer + 4, P[1], 4);
pBuffer += videoStride;
}
}
void InterplayDecoder::DecodeBlock14(int32_t offset)
{
// 1-color encoding : the whole block is 1 solid color
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint8_t pix = fr.ReadUInt8();
for (int y = 0; y < 8; y++)
{
memset(pBuffer, pix, 8);
pBuffer += videoStride;
}
}
void InterplayDecoder::DecodeBlock15(int32_t offset)
{
// dithered encoding
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint8_t P[2];
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
for (int y = 0; y < 8; y++)
{
for (int x = 0; x < 8; x += 2)
{
*pBuffer++ = P[y & 1];
*pBuffer++ = P[!(y & 1)];
}
pBuffer += (videoStride - 8);
}
}
uint8_t* InterplayDecoder::GetCurrentFrame()
{
return pVideoBuffers[nCurrentVideoBuffer];
}
uint8_t* InterplayDecoder::GetPreviousFrame()
{
return pVideoBuffers[nPreviousVideoBuffer];
}
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