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Read whole chunks at a time from Interplay MVE files

This commit is contained in:
Chris Robinson 2022-10-06 02:04:40 -07:00 committed by Christoph Oelckers
parent 80bf62cb3c
commit fa2cea3e5b
2 changed files with 237 additions and 130 deletions
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361
src/common/cutscenes/playmve.cpp
View File

@ -89,8 +89,10 @@ static const int16_t delta_table[] = {
};
// macro to fetch 16-bit little-endian words from a bytestream
#define LE_16(x) ((*x) | ((*(x+1)) << 8))
// macros to fetch little-endian words from a bytestream
#define LE_16(x) ((uint16_t)((*(x)) | ((*((x)+1)) << 8)))
#define LE_32(x) (LE_16(x) | ((uint32_t)LE_16(x+2) << 16))
#define LE_64(x) (LE_32(x) | ((uint64_t)LE_32(x+4) << 32))
static bool StreamCallbackFunc(SoundStream* stream, void* buff, int len, void* userdata)
{
@ -218,71 +220,70 @@ bool InterplayDecoder::RunFrame(uint64_t clock)
chunkSize = LE_16(&chunkPreamble[0]);
chunkType = LE_16(&chunkPreamble[2]);
ChunkData.resize(chunkSize);
if (fr.Read(ChunkData.data(), chunkSize) != chunkSize) {
Printf(TEXTCOLOR_RED "InterplayDecoder: could not read from file (EOF?)\n");
return false;
}
// iterate through individual opcodes
while (chunkSize > 0)
ChunkPtr = ChunkData.data();
while (chunkSize > 0 && chunkType != CHUNK_BAD)
{
if (fr.Read(opcodePreamble, OPCODE_PREAMBLE_SIZE) != OPCODE_PREAMBLE_SIZE)
if (chunkSize < OPCODE_PREAMBLE_SIZE)
{
Printf(TEXTCOLOR_RED "InterplayDecoder: could not read from file (EOF?)\n");
Printf(TEXTCOLOR_RED "InterplayDecoder: opcode size too small\n");
return false;
}
opcodeSize = LE_16(ChunkPtr);
opcodeType = ChunkPtr[2];
opcodeVersion = ChunkPtr[3];
opcodeSize = LE_16(&opcodePreamble[0]);
opcodeType = opcodePreamble[2];
opcodeVersion = opcodePreamble[3];
ChunkPtr += OPCODE_PREAMBLE_SIZE;
chunkSize -= OPCODE_PREAMBLE_SIZE;
if (chunkSize < opcodeSize)
{
Printf(TEXTCOLOR_RED "InterplayDecoder: opcode size too large for chunk\n");
return false;
}
chunkSize -= opcodeSize;
switch (opcodeType)
{
case OPCODE_END_OF_STREAM:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
ChunkPtr += opcodeSize;
break;
}
case OPCODE_END_OF_CHUNK:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
ChunkPtr += opcodeSize;
break;
}
case OPCODE_CREATE_TIMER:
{
nTimerRate = fr.ReadUInt32();
nTimerDiv = fr.ReadUInt16();
nTimerRate = LE_32(ChunkPtr);
nTimerDiv = LE_16(ChunkPtr+4);
ChunkPtr += 6;
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();
// Skip 2 bytes
uint16_t flags = LE_16(ChunkPtr+2);
audio.nSampleRate = LE_16(ChunkPtr+4);
ChunkPtr += 6;
uint32_t nBufferBytes;
uint32_t nBufferBytes = (opcodeVersion == 0) ? LE_16(ChunkPtr) : LE_32(ChunkPtr);
ChunkPtr += (opcodeVersion == 0) ? 2 : 4;
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;
}
audio.nChannels = (flags & 0x1) ? 2 : 1;
audio.nBitDepth = (flags & 0x2) ? 16 : 8;
audio.bCompressed = (opcodeVersion > 0 && (flags & 0x4));
break;
}
@ -290,24 +291,37 @@ bool InterplayDecoder::RunFrame(uint64_t clock)
{
if (!bAudioStarted)
{
S_StopMusic(true);
// start audio playback
stream = S_CreateCustomStream(6000, audio.nSampleRate, audio.nChannels, MusicSamples16bit, StreamCallbackFunc, this);
bAudioStarted = true;
}
fr.Seek(opcodeSize, FileReader::SeekCur);
ChunkPtr += opcodeSize;
break;
}
case OPCODE_INIT_VIDEO_BUFFERS:
{
assert(opcodeSize == 8);
nWidth = fr.ReadUInt16() * 8;
nHeight = fr.ReadUInt16() * 8;
assert(((opcodeVersion == 0 && opcodeSize >= 4) ||
(opcodeVersion == 1 && opcodeSize >= 6) ||
(opcodeVersion == 2 && opcodeSize >= 8)) &&
opcodeSize <= 8);
int count = fr.ReadUInt16();
int truecolour = fr.ReadUInt16();
assert(truecolour == 0);
nWidth = LE_16(ChunkPtr) * 8;
nHeight = LE_16(ChunkPtr+2) * 8;
int count, truecolour;
if (opcodeVersion > 0)
{
count = LE_16(ChunkPtr+4);
if (opcodeVersion > 1)
{
truecolour = LE_16(ChunkPtr+6);
assert(truecolour == 0);
}
}
ChunkPtr += opcodeSize;
pVideoBuffers[0] = new uint8_t[nWidth * nHeight];
pVideoBuffers[1] = new uint8_t[nWidth * nHeight];
@ -326,83 +340,143 @@ bool InterplayDecoder::RunFrame(uint64_t clock)
case OPCODE_UNKNOWN_14:
case OPCODE_UNKNOWN_15:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
ChunkPtr += opcodeSize;
break;
}
case OPCODE_SEND_BUFFER:
{
int nPalStart = fr.ReadUInt16();
int nPalCount = fr.ReadUInt16();
int nPalStart = LE_16(ChunkPtr);
int nPalCount = LE_16(ChunkPtr+2);
ChunkPtr += opcodeSize;
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
auto pStart = ChunkPtr;
uint16_t seqIndex = LE_16(ChunkPtr);
uint16_t streamMask = LE_16(ChunkPtr+2);
uint16_t nSamples = LE_16(ChunkPtr+4); // number of samples this chunk(?)
ChunkPtr += 6;
int predictor[2];
int i = 0;
for (int ch = 0; ch < audio.nChannels; ch++)
// We only bother with stream 0
if (!(streamMask & 1))
{
predictor[ch] = fr.ReadUInt16();
i++;
ChunkPtr += opcodeSize - 6;
break;
}
if (predictor[ch] & 0x8000) {
predictor[ch] |= 0xFFFF0000; // sign extend
nSamples = opcodeSize - 6;
if (audio.bCompressed)
{
int predictor[2];
for (int ch = 0; ch < audio.nChannels; ch++)
{
predictor[ch] = (int16_t)LE_16(ChunkPtr);
ChunkPtr += 2;
audio.samples[audio.nWrite++] = predictor[ch];
if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
}
audio.samples[audio.nWrite++] = predictor[ch];
if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
}
bool stereo = audio.nChannels == 2;
nSamples -= 2*audio.nChannels;
nSamples &= ~(int)stereo;
int ch = 0;
for (; i < (nSamples / 2); i++)
int ch = 0;
for (int i = 0; i < nSamples;)
{
int todo = std::min(nSamples-i, (int)std::size(audio.samples)-audio.nWrite);
auto end = ChunkPtr + todo;
while(ChunkPtr != end)
{
predictor[ch] += delta_table[*ChunkPtr++];
predictor[ch] = clamp(predictor[ch], -32768, 32767);
audio.samples[audio.nWrite++] = predictor[ch];
// toggle channel
ch ^= stereo;
}
if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
i += todo;
}
}
else if (audio.nBitDepth == 8)
{
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;
for (int i = 0; i < nSamples;)
{
int todo = std::min(nSamples-i, (int)std::size(audio.samples)-audio.nWrite);
auto end = ChunkPtr + todo;
while(ChunkPtr != end)
audio.samples[audio.nWrite++] = ((*ChunkPtr++)-128) << 8;
if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
i += todo;
}
}
else
{
nSamples /= 2;
for (int i = 0; i < nSamples;)
{
int todo = std::min(nSamples-i, (int)std::size(audio.samples)-audio.nWrite);
auto end = ChunkPtr + todo*2;
while(ChunkPtr != end)
{
audio.samples[audio.nWrite++] = (int16_t)LE_16(ChunkPtr);
ChunkPtr += 2;
}
if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
i += todo;
}
}
int nEnd = (int)fr.Tell();
int nRead = nEnd - nStart;
auto pEnd = ChunkPtr;
int nRead = (int)(pEnd - pStart);
assert(opcodeSize == nRead);
break;
}
case OPCODE_SILENCE_FRAME:
{
uint16_t seqIndex = fr.ReadUInt16();
uint16_t streamMask = fr.ReadUInt16();
uint16_t nStreamLen = fr.ReadUInt16();
uint16_t seqIndex = LE_16(ChunkPtr);
uint16_t streamMask = LE_16(ChunkPtr+2);
uint16_t nStreamLen = LE_16(ChunkPtr+4);
ChunkPtr += 6;
if (streamMask & 1)
{
nStreamLen = (opcodeSize-6) * 8 / audio.nBitDepth;
for (int i = 0; i < nStreamLen;)
{
int todo = std::min(nStreamLen-i, (int)std::size(audio.samples)-audio.nWrite);
memset(&audio.samples[audio.nWrite], 0, todo*2);
audio.nWrite += todo;
if (audio.nWrite >= (int)countof(audio.samples)) audio.nWrite = 0;
i += todo;
}
}
break;
}
case OPCODE_INIT_VIDEO_MODE:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
ChunkPtr += opcodeSize;
break;
}
case OPCODE_CREATE_GRADIENT:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
ChunkPtr += opcodeSize;
Printf("InterplayDecoder: Create gradient not supported.\n");
break;
}
@ -415,20 +489,29 @@ bool InterplayDecoder::RunFrame(uint64_t clock)
break;
}
int nPalStart = fr.ReadUInt16();
int nPalCount = fr.ReadUInt16();
for (int i = nPalStart; i <= nPalCount; i++)
int nPalStart = LE_16(ChunkPtr);
int nPalEnd = nPalStart + LE_16(ChunkPtr+2) - 1;
ChunkPtr += 4;
if (nPalStart > 255 || nPalEnd > 255) {
Printf("set_palette indices out of range (%d -> %d)\n", nPalStart, nPalEnd);
chunkType = CHUNK_BAD;
break;
}
for (int i = nPalStart; i <= nPalEnd; i++)
{
palette[i].r = fr.ReadUInt8() << 2;
palette[i].g = fr.ReadUInt8() << 2;
palette[i].b = fr.ReadUInt8() << 2;
palette[i].r = (*ChunkPtr++) << 2;
palette[i].g = (*ChunkPtr++) << 2;
palette[i].b = (*ChunkPtr++) << 2;
palette[i].r |= palette[i].r >> 6;
palette[i].g |= palette[i].g >> 6;
palette[i].b |= palette[i].b >> 6;
}
break;
}
case OPCODE_SET_PALETTE_COMPRESSED:
{
fr.Seek(opcodeSize, FileReader::SeekCur);
ChunkPtr += opcodeSize;
Printf("InterplayDecoder: Set palette compressed not supported.\n");
break;
}
@ -449,17 +532,17 @@ bool InterplayDecoder::RunFrame(uint64_t clock)
}
}
int nRead = (int)fr.Read(decodeMap.pData, opcodeSize);
assert(nRead == opcodeSize);
memcpy(decodeMap.pData, ChunkPtr, opcodeSize);
ChunkPtr += opcodeSize;
break;
}
case OPCODE_VIDEO_DATA:
{
int nStart = (int)fr.Tell();
auto pStart = ChunkPtr;
// need to skip 14 bytes
fr.Seek(14, FileReader::SeekCur);
ChunkPtr += 14;
if (decodeMap.nSize)
{
@ -536,11 +619,11 @@ bool InterplayDecoder::RunFrame(uint64_t clock)
}
}
int nEnd = (int)fr.Tell();
int nSkipBytes = opcodeSize - (nEnd - nStart); // we can end up with 1 byte left we need to skip
auto pEnd = ChunkPtr;
int nSkipBytes = opcodeSize - (int)(pEnd - pStart); // we can end up with 1 byte left we need to skip
assert(nSkipBytes <= 1);
fr.Seek(nSkipBytes, FileReader::SeekCur);
ChunkPtr += nSkipBytes;
break;
}
@ -581,7 +664,7 @@ void InterplayDecoder::DecodeBlock1(int32_t offset)
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();
uint8_t B = *ChunkPtr++;
int x, y;
@ -603,7 +686,7 @@ void InterplayDecoder::DecodeBlock2(int32_t offset)
void InterplayDecoder::DecodeBlock3(int32_t offset)
{
// copy 8x8 block from current frame from an up/left block
uint8_t B = fr.ReadUInt8();
uint8_t B = *ChunkPtr++;
int x, y;
@ -629,7 +712,7 @@ void InterplayDecoder::DecodeBlock4(int32_t offset)
int x, y;
uint8_t B, BL, BH;
B = fr.ReadUInt8();
B = *ChunkPtr++;
BL = B & 0x0F;
BH = (B >> 4) & 0x0F;
@ -645,8 +728,8 @@ void InterplayDecoder::DecodeBlock4(int32_t offset)
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();
int8_t x = *ChunkPtr++;
int8_t y = *ChunkPtr++;
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);
@ -662,8 +745,8 @@ void InterplayDecoder::DecodeBlock7(int32_t offset)
uint32_t flags = 0;
uint8_t P[2];
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
P[0] = *ChunkPtr++;
P[1] = *ChunkPtr++;
// 2-color encoding
if (P[0] <= P[1])
@ -671,7 +754,7 @@ void InterplayDecoder::DecodeBlock7(int32_t offset)
// need 8 more bytes from the stream
for (int y = 0; y < 8; y++)
{
flags = fr.ReadUInt8() | 0x100;
flags = (*ChunkPtr++) | 0x100;
for (; flags != 1; flags >>= 1) {
*pBuffer++ = P[flags & 1];
}
@ -681,7 +764,8 @@ void InterplayDecoder::DecodeBlock7(int32_t offset)
else
{
// need 2 more bytes from the stream
flags = fr.ReadUInt16();
flags = LE_16(ChunkPtr);
ChunkPtr += 2;
for (int y = 0; y < 8; y += 2)
{
@ -704,8 +788,8 @@ void InterplayDecoder::DecodeBlock8(int32_t offset)
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();
P[0] = *ChunkPtr++;
P[1] = *ChunkPtr++;
if (P[0] <= P[1])
{
@ -715,10 +799,11 @@ void InterplayDecoder::DecodeBlock8(int32_t offset)
if (!(y & 3))
{
if (y) {
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
P[0] = *ChunkPtr++;
P[1] = *ChunkPtr++;
}
flags = fr.ReadUInt16();
flags = LE_16(ChunkPtr);
ChunkPtr += 2;
}
for (int x = 0; x < 4; x++, flags >>= 1) {
@ -732,9 +817,10 @@ void InterplayDecoder::DecodeBlock8(int32_t offset)
}
else
{
flags = fr.ReadUInt32();
P[2] = fr.ReadUInt8();
P[3] = fr.ReadUInt8();
flags = LE_32(ChunkPtr);
ChunkPtr += 4;
P[2] = *ChunkPtr++;
P[3] = *ChunkPtr++;
if (P[2] <= P[3])
{
@ -752,7 +838,8 @@ void InterplayDecoder::DecodeBlock8(int32_t offset)
pBuffer -= 8 * videoStride - 4;
P[0] = P[2];
P[1] = P[3];
flags = fr.ReadUInt32();
flags = LE_32(ChunkPtr);
ChunkPtr += 4;
}
}
}
@ -764,7 +851,8 @@ void InterplayDecoder::DecodeBlock8(int32_t offset)
if (y == 4) {
P[0] = P[2];
P[1] = P[3];
flags = fr.ReadUInt32();
flags = LE_32(ChunkPtr);
ChunkPtr += 4;
}
for (int x = 0; x < 8; x++, flags >>= 1)
@ -781,7 +869,8 @@ void InterplayDecoder::DecodeBlock9(int32_t offset)
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint8_t P[4];
fr.Read(P, 4);
memcpy(P, ChunkPtr, 4);
ChunkPtr += 4;
// 4-color encoding
if (P[0] <= P[1])
@ -792,7 +881,8 @@ void InterplayDecoder::DecodeBlock9(int32_t offset)
for (int y = 0; y < 8; y++)
{
// get the next set of 8 2-bit flags
int flags = fr.ReadUInt16();
int flags = LE_16(ChunkPtr);
ChunkPtr += 2;
for (int x = 0; x < 8; x++, flags >>= 2) {
*pBuffer++ = P[flags & 0x03];
@ -804,7 +894,8 @@ void InterplayDecoder::DecodeBlock9(int32_t offset)
else
{
// 1 of 4 colors for each 2x2 block, need 4 more bytes
uint32_t flags = fr.ReadUInt32();
uint32_t flags = LE_32(ChunkPtr);
ChunkPtr += 4;
for (int y = 0; y < 8; y += 2)
{
@ -823,7 +914,8 @@ void InterplayDecoder::DecodeBlock9(int32_t offset)
else
{
// 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes
uint64_t flags = fr.ReadUInt64();
uint64_t flags = LE_64(ChunkPtr);
ChunkPtr += 8;
if (P[2] <= P[3])
{
@ -857,7 +949,8 @@ void InterplayDecoder::DecodeBlock10(int32_t offset)
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint8_t P[8];
fr.Read(P, 4);
memcpy(P, ChunkPtr, 4);
ChunkPtr += 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])
@ -869,8 +962,12 @@ void InterplayDecoder::DecodeBlock10(int32_t offset)
{
// new values for each 4x4 block
if (!(y & 3)) {
if (y) fr.Read(P, 4);
flags = fr.ReadUInt32();
if (y) {
memcpy(P, ChunkPtr, 4);
ChunkPtr += 4;
}
flags = LE_32(ChunkPtr);
ChunkPtr += 4;
}
for (int x = 0; x < 4; x++, flags >>= 2) {
@ -886,9 +983,11 @@ void InterplayDecoder::DecodeBlock10(int32_t offset)
{
// vertical split?
int vert;
uint64_t flags = fr.ReadUInt64();
uint64_t flags = LE_64(ChunkPtr);
ChunkPtr += 8;
fr.Read(P + 4, 4);
memcpy(P + 4, ChunkPtr, 4);
ChunkPtr += 4;
vert = P[4] <= P[5];
// 4-color encoding for either left and right or top and bottom halves
@ -908,7 +1007,8 @@ void InterplayDecoder::DecodeBlock10(int32_t offset)
// load values for second half
if (y == 7) {
memcpy(P, P + 4, 4);
flags = fr.ReadUInt64();
flags = LE_64(ChunkPtr);
ChunkPtr += 8;
}
}
}
@ -921,7 +1021,8 @@ void InterplayDecoder::DecodeBlock11(int32_t offset)
for (int y = 0; y < 8; y++)
{
fr.Read(pBuffer, 8);
memcpy(pBuffer, ChunkPtr, 8);
ChunkPtr += 8;
pBuffer += videoStride;
}
}
@ -938,7 +1039,7 @@ void InterplayDecoder::DecodeBlock12(int32_t offset)
pBuffer[x] =
pBuffer[x + 1] =
pBuffer[x + videoStride] =
pBuffer[x + 1 + videoStride] = fr.ReadUInt8();
pBuffer[x + 1 + videoStride] = *ChunkPtr++;
}
pBuffer += videoStride * 2;
}
@ -954,8 +1055,8 @@ void InterplayDecoder::DecodeBlock13(int32_t offset)
{
if (!(y & 3))
{
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
P[0] = *ChunkPtr++;
P[1] = *ChunkPtr++;
}
memset(pBuffer, P[0], 4);
@ -968,7 +1069,7 @@ 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();
uint8_t pix = *ChunkPtr++;
for (int y = 0; y < 8; y++)
{
@ -983,8 +1084,8 @@ void InterplayDecoder::DecodeBlock15(int32_t offset)
uint8_t* pBuffer = GetCurrentFrame() + (intptr_t)offset;
uint8_t P[2];
P[0] = fr.ReadUInt8();
P[1] = fr.ReadUInt8();
P[0] = *ChunkPtr++;
P[1] = *ChunkPtr++;
for (int y = 0; y < 8; y++)
{

6
src/common/cutscenes/playmve.h
View File

@ -44,6 +44,8 @@
#pragma once
#include <vector>
#include "files.h"
#include "animtexture.h"
#include "s_music.h"
@ -111,6 +113,7 @@ public:
int nChannels;
uint16_t nSampleRate;
uint8_t nBitDepth;
bool bCompressed;
int16_t samples[6000 * kAudioBlocks]; // must be a multiple of the stream buffer size
int nWrite;
@ -165,6 +168,9 @@ private:
double nFps;
uint64_t nFrameDuration;
std::vector<uint8_t> ChunkData;
const uint8_t *ChunkPtr = nullptr;
uint8_t* pVideoBuffers[2];
uint32_t nCurrentVideoBuffer, nPreviousVideoBuffer;
int32_t videoStride;