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1008 lines
30 KiB
C++
1008 lines
30 KiB
C++
/*
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* InterplayDecoder
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* Copyright (C) 2020 sirlemonhead
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* This code is based on interplayvideo.c, dpcm.c and ipmovie.c from the FFmpeg project which can be obtained
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* from http://www.ffmpeg.org/. Below is the license from interplayvideo.c
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/*
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* Interplay MVE Video Decoder
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* Copyright (C) 2003 The FFmpeg project
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <algorithm>
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#include "playmve.h"
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#include "printf.h"
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#include "v_draw.h"
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#include "s_music.h"
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#include "cmdlib.h"
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static const int16_t delta_table[] = {
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0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30, 31,
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32, 33, 34, 35, 36, 37, 38, 39,
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40, 41, 42, 43, 47, 51, 56, 61,
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66, 72, 79, 86, 94, 102, 112, 122,
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133, 145, 158, 173, 189, 206, 225, 245,
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267, 292, 318, 348, 379, 414, 452, 493,
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538, 587, 640, 699, 763, 832, 908, 991,
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1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993,
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2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008,
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4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059,
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8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206,
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17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589,
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-29973, -26728, -23186, -19322, -15105, -10503, -5481, -1,
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1, 1, 5481, 10503, 15105, 19322, 23186, 26728,
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29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298,
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-17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597,
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-8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772,
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-4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373,
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-2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180,
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-1081, -991, -908, -832, -763, -699, -640, -587,
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-538, -493, -452, -414, -379, -348, -318, -292,
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-267, -245, -225, -206, -189, -173, -158, -145,
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-133, -122, -112, -102, -94, -86, -79, -72,
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-66, -61, -56, -51, -47, -43, -42, -41,
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-40, -39, -38, -37, -36, -35, -34, -33,
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-32, -31, -30, -29, -28, -27, -26, -25,
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-24, -23, -22, -21, -20, -19, -18, -17,
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-16, -15, -14, -13, -12, -11, -10, -9,
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-8, -7, -6, -5, -4, -3, -2, -1
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};
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// macro to fetch 16-bit little-endian words from a bytestream
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#define LE_16(x) ((*x) | ((*(x+1)) << 8))
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static bool StreamCallbackFunc(SoundStream* stream, void* buff, int len, void* userdata)
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{
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InterplayDecoder* pId = (InterplayDecoder*)userdata;
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memcpy(buff, &pId->audio.samples[pId->audio.nRead], len);
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pId->audio.nRead += len / 2;
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if (pId->audio.nRead >= (int)countof(pId->audio.samples)) pId->audio.nRead = 0;
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return true;
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}
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InterplayDecoder::InterplayDecoder(bool soundenabled)
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{
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bIsPlaying = false;
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bAudioStarted = !soundenabled; // This prevents the stream from getting created
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nWidth = 0;
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nHeight = 0;
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nFrame = 0;
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memset(palette, 0, sizeof(palette));
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memset(&audio, 0, sizeof(audio));
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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.
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nFps = 0.0;
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nFrameDuration = 0;
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nTimerRate = 0;
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nTimerDiv = 0;
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pVideoBuffers[0] = nullptr;
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pVideoBuffers[1] = nullptr;
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decodeMap.pData = nullptr;
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decodeMap.nSize = 0;
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nCurrentVideoBuffer = 0;
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nPreviousVideoBuffer = 1;
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videoStride = 0;
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}
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InterplayDecoder::~InterplayDecoder()
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{
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Close();
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}
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void InterplayDecoder::SwapFrames()
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{
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int t = nPreviousVideoBuffer;
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nPreviousVideoBuffer = nCurrentVideoBuffer;
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nCurrentVideoBuffer = t;
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}
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void InterplayDecoder::Close()
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{
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fr.Close();
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bIsPlaying = false;
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if (stream)
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S_StopCustomStream(stream);
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stream = nullptr;
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if (decodeMap.pData) {
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delete[] decodeMap.pData;
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decodeMap.pData = nullptr;
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}
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if (pVideoBuffers[0]) {
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delete[] pVideoBuffers[0];
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pVideoBuffers[0] = nullptr;
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}
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if (pVideoBuffers[1]) {
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delete[] pVideoBuffers[1];
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pVideoBuffers[1] = nullptr;
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}
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}
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bool InterplayDecoder::Open(FileReader &fr_)
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{
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// open the file (read only)
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char lsig[20];
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// check the file signature
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fr_.Read((uint8_t*)lsig, sizeof(lsig));
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if (memcmp(lsig, "Interplay MVE File\x1A\0", sizeof(lsig)) != 0)
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{
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Printf(TEXTCOLOR_RED "InterplayDecoder: Unknown MVE signature\n ");
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return false;
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}
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// skip the next 6 bytes
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fr_.Seek(6, FileReader::SeekCur);
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fr = std::move(fr_);
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//Run();
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return true;
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}
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bool InterplayDecoder::RunFrame(uint64_t clock)
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{
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uint8_t chunkPreamble[CHUNK_PREAMBLE_SIZE];
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uint8_t opcodePreamble[OPCODE_PREAMBLE_SIZE];
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uint8_t opcodeType;
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uint8_t opcodeVersion;
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int opcodeSize, chunkSize;
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int chunkType = 0;
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// iterate through the chunks in the file
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do
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{
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// handle timing - wait until we're ready to process the next frame.
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if (nNextFrameTime > clock) {
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return true;
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}
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else {
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nNextFrameTime += nFrameDuration;
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}
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if (fr.Read(chunkPreamble, CHUNK_PREAMBLE_SIZE) != CHUNK_PREAMBLE_SIZE) {
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Printf(TEXTCOLOR_RED "InterplayDecoder: could not read from file (EOF?)\n");
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return false;
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}
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chunkSize = LE_16(&chunkPreamble[0]);
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chunkType = LE_16(&chunkPreamble[2]);
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// iterate through individual opcodes
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while (chunkSize > 0)
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{
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if (fr.Read(opcodePreamble, OPCODE_PREAMBLE_SIZE) != OPCODE_PREAMBLE_SIZE)
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{
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Printf(TEXTCOLOR_RED "InterplayDecoder: could not read from file (EOF?)\n");
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return false;
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}
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opcodeSize = LE_16(&opcodePreamble[0]);
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opcodeType = opcodePreamble[2];
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opcodeVersion = opcodePreamble[3];
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chunkSize -= OPCODE_PREAMBLE_SIZE;
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chunkSize -= opcodeSize;
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switch (opcodeType)
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{
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case OPCODE_END_OF_STREAM:
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{
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fr.Seek(opcodeSize, FileReader::SeekCur);
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break;
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}
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case OPCODE_END_OF_CHUNK:
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{
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fr.Seek(opcodeSize, FileReader::SeekCur);
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break;
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}
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case OPCODE_CREATE_TIMER:
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{
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nTimerRate = fr.ReadUInt32();
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nTimerDiv = fr.ReadUInt16();
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nFrameDuration = ((uint64_t)nTimerRate * nTimerDiv) * 1000;
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break;
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}
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case OPCODE_INIT_AUDIO_BUFFERS:
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{
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fr.Seek(2, FileReader::SeekCur);
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uint16_t flags = fr.ReadUInt16();
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audio.nSampleRate = fr.ReadUInt16();
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uint32_t nBufferBytes;
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if (opcodeVersion == 0) {
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nBufferBytes = fr.ReadUInt16();
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}
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else {
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nBufferBytes = fr.ReadUInt32();
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}
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if (flags & 0x1) {
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audio.nChannels = 2;
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}
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else {
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audio.nChannels = 1;
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}
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if (flags & 0x2) {
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audio.nBitDepth = 16;
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}
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else {
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audio.nBitDepth = 8;
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}
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break;
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}
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case OPCODE_START_STOP_AUDIO:
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{
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if (!bAudioStarted)
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{
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// start audio playback
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stream = S_CreateCustomStream(6000, audio.nSampleRate, audio.nChannels, StreamCallbackFunc, this);
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bAudioStarted = true;
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}
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fr.Seek(opcodeSize, FileReader::SeekCur);
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break;
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}
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case OPCODE_INIT_VIDEO_BUFFERS:
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{
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assert(opcodeSize == 8);
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nWidth = fr.ReadUInt16() * 8;
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nHeight = fr.ReadUInt16() * 8;
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int count = fr.ReadUInt16();
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int truecolour = fr.ReadUInt16();
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assert(truecolour == 0);
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pVideoBuffers[0] = new uint8_t[nWidth * nHeight];
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pVideoBuffers[1] = new uint8_t[nWidth * nHeight];
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videoStride = nWidth;
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animtex.SetSize(AnimTexture::Paletted, nWidth, nHeight);
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break;
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}
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case OPCODE_UNKNOWN_06:
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case OPCODE_UNKNOWN_0E:
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case OPCODE_UNKNOWN_10:
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case OPCODE_UNKNOWN_12:
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case OPCODE_UNKNOWN_13:
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case OPCODE_UNKNOWN_14:
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case OPCODE_UNKNOWN_15:
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{
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fr.Seek(opcodeSize, FileReader::SeekCur);
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break;
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}
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case OPCODE_SEND_BUFFER:
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{
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int nPalStart = fr.ReadUInt16();
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int nPalCount = fr.ReadUInt16();
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animtex.SetFrame(&palette[0].r , GetCurrentFrame());
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nFrame++;
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SwapFrames();
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fr.Seek(opcodeSize-4, FileReader::SeekCur);
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break;
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}
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case OPCODE_AUDIO_FRAME:
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{
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int nStart = (int)fr.Tell();
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uint16_t seqIndex = fr.ReadUInt16();
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uint16_t streamMask = fr.ReadUInt16();
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uint16_t nSamples = fr.ReadUInt16(); // number of samples this chunk
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int predictor[2];
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int i = 0;
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for (int ch = 0; ch < audio.nChannels; ch++)
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{
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predictor[ch] = fr.ReadUInt16();
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i++;
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if (predictor[ch] & 0x8000) {
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predictor[ch] |= 0xFFFF0000; // sign extend
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}
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audio.samples[audio.nWrite++] = predictor[ch];
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if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
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}
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int ch = 0;
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for (; i < (nSamples / 2); i++)
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{
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predictor[ch] += delta_table[fr.ReadUInt8()];
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predictor[ch] = clamp(predictor[ch], -32768, 32768);
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audio.samples[audio.nWrite++] = predictor[ch];
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if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
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// toggle channel
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ch ^= audio.nChannels - 1;
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}
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int nEnd = (int)fr.Tell();
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int nRead = nEnd - nStart;
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assert(opcodeSize == nRead);
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break;
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}
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case OPCODE_SILENCE_FRAME:
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{
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uint16_t seqIndex = fr.ReadUInt16();
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uint16_t streamMask = fr.ReadUInt16();
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uint16_t nStreamLen = fr.ReadUInt16();
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break;
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}
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case OPCODE_INIT_VIDEO_MODE:
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{
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fr.Seek(opcodeSize, FileReader::SeekCur);
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break;
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}
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case OPCODE_CREATE_GRADIENT:
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{
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fr.Seek(opcodeSize, FileReader::SeekCur);
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Printf("InterplayDecoder: Create gradient not supported.\n");
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break;
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}
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case OPCODE_SET_PALETTE:
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{
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if (opcodeSize > 0x304 || opcodeSize < 4) {
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Printf("set_palette opcode with invalid size\n");
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chunkType = CHUNK_BAD;
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break;
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}
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int nPalStart = fr.ReadUInt16();
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int nPalCount = fr.ReadUInt16();
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for (int i = nPalStart; i <= nPalCount; i++)
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{
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palette[i].r = fr.ReadUInt8() << 2;
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palette[i].g = fr.ReadUInt8() << 2;
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palette[i].b = fr.ReadUInt8() << 2;
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}
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break;
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}
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case OPCODE_SET_PALETTE_COMPRESSED:
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{
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fr.Seek(opcodeSize, FileReader::SeekCur);
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Printf("InterplayDecoder: Set palette compressed not supported.\n");
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break;
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}
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case OPCODE_SET_DECODING_MAP:
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{
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if (!decodeMap.pData)
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{
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decodeMap.pData = new uint8_t[opcodeSize];
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decodeMap.nSize = opcodeSize;
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}
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else
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{
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if (opcodeSize != (int)decodeMap.nSize) {
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delete[] decodeMap.pData;
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decodeMap.pData = new uint8_t[opcodeSize];
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decodeMap.nSize = opcodeSize;
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}
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}
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int nRead = (int)fr.Read(decodeMap.pData, opcodeSize);
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assert(nRead == opcodeSize);
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break;
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}
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case OPCODE_VIDEO_DATA:
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{
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int nStart = (int)fr.Tell();
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// need to skip 14 bytes
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fr.Seek(14, FileReader::SeekCur);
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if (decodeMap.nSize)
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{
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int i = 0;
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for (uint32_t y = 0; y < nHeight; y += 8)
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{
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for (uint32_t x = 0; x < nWidth; x += 8)
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{
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uint32_t opcode;
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// alternate between getting low and high 4 bits
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if (i & 1) {
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opcode = decodeMap.pData[i >> 1] >> 4;
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}
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else {
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opcode = decodeMap.pData[i >> 1] & 0x0F;
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}
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i++;
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int32_t offset = x + (y * videoStride);
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switch (opcode)
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{
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default:
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break;
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case 0:
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DecodeBlock0(offset);
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break;
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case 1:
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DecodeBlock1(offset);
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break;
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case 2:
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DecodeBlock2(offset);
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break;
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case 3:
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DecodeBlock3(offset);
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break;
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case 4:
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DecodeBlock4(offset);
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break;
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case 5:
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DecodeBlock5(offset);
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break;
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case 7:
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DecodeBlock7(offset);
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break;
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case 8:
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DecodeBlock8(offset);
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break;
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case 9:
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DecodeBlock9(offset);
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break;
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case 10:
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DecodeBlock10(offset);
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break;
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case 11:
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DecodeBlock11(offset);
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break;
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case 12:
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DecodeBlock12(offset);
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break;
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case 13:
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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];
|
|
}
|