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scummvm/video/hnm_decoder.cpp
Le Philousophe 0c178b00f4 VIDEO: Make unsigned -1 looking better
2022-01-12 09:10:40 +01:00

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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/debug.h"
#include "common/endian.h"
#include "common/system.h"
#include "common/memstream.h"
#include "common/file.h"
#include "common/textconsole.h"
#include "audio/decoders/raw.h"
#include "video/hnm_decoder.h"
#include "image/codecs/hlz.h"
namespace Video {
// When no sound display a frame every 80ms
HNMDecoder::HNMDecoder(bool loop, byte *initialPalette) : _regularFrameDelayMs(80),
_videoTrack(nullptr), _audioTrack(nullptr), _stream(nullptr),
_loop(loop), _initialPalette(initialPalette), _dataBuffer(nullptr), _dataBufferAlloc(0) {
}
HNMDecoder::~HNMDecoder() {
close();
delete[] _initialPalette;
// We don't deallocate _videoTrack and _audioTrack as they are owned by base class
}
bool HNMDecoder::loadStream(Common::SeekableReadStream *stream) {
close();
uint32 tag = stream->readUint32BE();
/* For now, only HNM4 and UBB2, HNM6 in the future */
if (tag != MKTAG('H', 'N', 'M', '4') &&
tag != MKTAG('U', 'B', 'B', '2')) {
close();
return false;
}
//uint32 ukn = stream->readUint32BE();
stream->skip(4);
uint16 width = stream->readUint16LE();
uint16 height = stream->readUint16LE();
//uint32 filesize = stream->readUint32LE();
stream->skip(4);
uint32 frameCount = stream->readUint32LE();
//uint32 tabOffset = stream->readUint32LE();
stream->skip(4);
uint16 soundBits = stream->readUint16LE();
uint16 soundFormat = stream->readUint16LE();
uint32 frameSize = stream->readUint32LE();
byte unknownStr[16];
byte copyright[16];
stream->read(unknownStr, sizeof(unknownStr));
stream->read(copyright, sizeof(copyright));
if (_loop) {
// This will force loop mode
frameCount = 0;
}
// When no audio use a factor of 1 for audio timestamp
uint32 audioSampleRate = 1;
_videoTrack = nullptr;
_audioTrack = nullptr;
if (tag == MKTAG('H', 'N', 'M', '4')) {
if (soundFormat == 2 && soundBits != 0) {
// HNM4 is Mono 22050Hz
_audioTrack = new DPCMAudioTrack(soundFormat, soundBits, 22050, false, getSoundType());
audioSampleRate = 22050;
}
_videoTrack = new HNM4VideoTrack(width, height, frameSize, frameCount,
_regularFrameDelayMs, audioSampleRate,
_initialPalette);
} else if (tag == MKTAG('U', 'B', 'B', '2')) {
if (soundFormat == 2 && soundBits == 0) {
// UBB2 is Stereo 22050Hz
_audioTrack = new DPCMAudioTrack(soundFormat, 16, 22050, true, getSoundType());
audioSampleRate = 22050;
}
_videoTrack = new HNM5VideoTrack(width, height, frameSize, frameCount,
_regularFrameDelayMs, audioSampleRate,
_initialPalette);
} else {
// We should never be here
close();
return false;
}
addTrack(_videoTrack);
if (_audioTrack) {
addTrack(_audioTrack);
}
_stream = stream;
return true;
}
void HNMDecoder::close() {
VideoDecoder::close();
// Tracks are cleant by VideoDecoder::close
_videoTrack = nullptr;
_audioTrack = nullptr;
delete _stream;
_stream = nullptr;
delete[] _dataBuffer;
_dataBuffer = nullptr;
_dataBufferAlloc = 0;
}
void HNMDecoder::readNextPacket() {
// We are called to feed a frame
// Each chunk is packetized and a packet seems to contain only one frame
uint32 superchunkRemaining = _stream->readUint32LE();
if (!superchunkRemaining) {
if (!_loop) {
error("End of file but still requesting data");
} else {
// Looping: read back from start of file, skip header and read a new super chunk header
_videoTrack->restart();
_stream->seek(64, SEEK_SET);
superchunkRemaining = _stream->readUint32LE();
}
}
superchunkRemaining = superchunkRemaining & 0x00ffffff;
if (superchunkRemaining < 4) {
error("Invalid superchunk header");
}
superchunkRemaining -= 4;
if (_dataBufferAlloc < superchunkRemaining) {
delete[] _dataBuffer;
_dataBuffer = new byte[superchunkRemaining];
_dataBufferAlloc = superchunkRemaining;
}
if (_stream->read(_dataBuffer, superchunkRemaining) != superchunkRemaining) {
error("Not enough data in file");
}
// We use -1 here to discrimate a possibly empty sound frame
uint32 audioNumSamples = -1;
byte *data_p = _dataBuffer;
while (superchunkRemaining > 0) {
if (superchunkRemaining < 8) {
error("Not enough data in superchunk");
}
uint32 chunkSize = READ_LE_UINT32(data_p);
data_p += sizeof(uint32);
uint16 chunkType = READ_BE_UINT16(data_p);
data_p += sizeof(uint16);
uint16 flags = READ_LE_UINT16(data_p);
data_p += sizeof(uint16);
if (superchunkRemaining < chunkSize) {
error("Chunk has a bogus size");
}
if (chunkType == MKTAG16('S', 'D')) {
if (_audioTrack) {
audioNumSamples = _audioTrack->decodeSound(data_p, chunkSize - 8);
} else {
warning("Got audio data without an audio track");
}
} else {
_videoTrack->decodeChunk(data_p, chunkSize - 8, chunkType, flags);
}
data_p += (chunkSize - 8);
superchunkRemaining -= chunkSize;
}
_videoTrack->newFrame(audioNumSamples);
}
HNMDecoder::HNMVideoTrack::HNMVideoTrack(uint32 frameCount,
uint32 regularFrameDelayMs, uint32 audioSampleRate) :
_frameCount(frameCount), _curFrame(-1), _regularFrameDelayMs(regularFrameDelayMs),
_nextFrameStartTime(0, audioSampleRate) {
restart();
}
void HNMDecoder::HNMVideoTrack::newFrame(uint32 frameDelay) {
// Frame done
_curFrame++;
// Add frameDelay if we had no sound
// We can't rely on a detection in the header as some soundless HNM indicate they have
if (frameDelay == uint32(-1)) {
_nextFrameStartTime = _nextFrameStartTime.addMsecs(_regularFrameDelayMs);
}
// HNM decoders use sound double buffering to pace the frames
// First frame is loaded in first buffer, second frame in second buffer
// It's only for third frame that we wait for the first buffer to be free
// It's presentation time is then delayed by the number of sound samples in the first frame
if (_lastFrameDelaySamps) {
_nextFrameStartTime = _nextFrameStartTime.addFrames(_lastFrameDelaySamps);
}
_lastFrameDelaySamps = frameDelay;
}
HNMDecoder::HNM45VideoTrack::HNM45VideoTrack(uint32 width, uint32 height, uint32 frameSize,
uint32 frameCount, uint32 regularFrameDelayMs, uint32 audioSampleRate,
const byte *initialPalette) :
HNMVideoTrack(frameCount, regularFrameDelayMs, audioSampleRate) {
// Get the currently loaded palette for undefined colors
if (initialPalette) {
memcpy(_palette, initialPalette, 256 * 3);
} else {
memset(_palette, 0, 256 * 3);
}
_dirtyPalette = true;
if (width * height > frameSize) {
error("Invalid frameSize: expected %d, got %d", width * height, frameSize);
}
_frameBufferC = new byte[frameSize]();
_frameBufferP = new byte[frameSize]();
// We will use _frameBufferC/P as the surface pixels, just init there with nullptr to avoid unintended usage of surface
const Graphics::PixelFormat &f = Graphics::PixelFormat::createFormatCLUT8();
_surface.init(width, height, width * f.bytesPerPixel, nullptr, f);
}
HNMDecoder::HNM45VideoTrack::~HNM45VideoTrack() {
// Don't free _surface as we didn't used create() but init()
delete[] _frameBufferC;
_frameBufferC = nullptr;
delete[] _frameBufferP;
_frameBufferP = nullptr;
}
void HNMDecoder::HNM45VideoTrack::decodePalette(byte *data, uint32 size) {
while (true) {
if (size < 2) {
break;
}
uint start = *(data++);
uint count = *(data++);
size -= 2;
if (start == 255 && count == 255) {
break;
}
if (count == 0) {
count = 256;
}
if (size < count * 3) {
error("Invalid palette chunk data");
}
if (start + count > 256) {
error("Invalid palette start/count values");
}
if (size < count * 3) {
error("Not enough data for palette");
}
byte *palette_ptr = &_palette[start * 3];
for (; count > 0; count--) {
byte r = *(data++);
byte g = *(data++);
byte b = *(data++);
*(palette_ptr++) = r * 4;
*(palette_ptr++) = g * 4;
*(palette_ptr++) = b * 4;
}
size -= count * 3;
}
_dirtyPalette = true;
}
HNMDecoder::HNM4VideoTrack::HNM4VideoTrack(uint32 width, uint32 height, uint32 frameSize,
uint32 frameCount, uint32 regularFrameDelayMs, uint32 audioSampleRate,
const byte *initialPalette) :
HNM45VideoTrack(width, height, frameSize, frameCount,
regularFrameDelayMs, audioSampleRate, initialPalette) {
_frameBufferF = new byte[frameSize]();
}
HNMDecoder::HNM4VideoTrack::~HNM4VideoTrack() {
// Don't free _surface as we didn't used create() but init()
delete[] _frameBufferF;
_frameBufferF = nullptr;
}
void HNMDecoder::HNM4VideoTrack::decodeChunk(byte *data, uint32 size,
uint16 chunkType, uint16 flags) {
if (chunkType == MKTAG16('P', 'L')) {
decodePalette(data, size);
} else if (chunkType == MKTAG16('I', 'Z')) {
if (size < 4) {
error("Not enough data for IZ");
}
decodeIntraframe(data + 4, size - 4);
presentFrame(flags);
} else if (chunkType == MKTAG16('I', 'U')) {
if ((flags & 1) == 1) {
decodeInterframeA(data, size);
} else {
decodeInterframe(data, size);
}
presentFrame(flags);
} else {
error("HNM4: Got %d chunk: size %d", chunkType, size);
}
}
void HNMDecoder::HNM4VideoTrack::decodeInterframe(byte *data, uint32 size) {
SWAP(_frameBufferC, _frameBufferP);
uint16 width = _surface.w;
bool eop = false;
uint32 currentPos = 0;
while (!eop) {
if (size < 1) {
warning("Not enough data in chunk for interframe block");
break;
}
byte countFlgs = *(data++);
size -= 1;
byte count = countFlgs & 0x1f;
byte flgs = (countFlgs >> 5) & 0x7;
if (count == 0) {
int c, fill;
switch (flgs) {
case 0:
if (size < 2) {
error("Not enough data for case 0");
}
// Copy next two bytes of input to the output
c = *(data++);
_frameBufferC[currentPos++] = c;
c = *(data++);
_frameBufferC[currentPos++] = c;
size -= 2;
break;
case 1:
if (size < 1) {
error("Not enough data for case 1");
}
// Skip (next byte of input) * 2 bytes of output
c = *(data++) * 2;
currentPos += c;
size -= 1;
break;
case 2:
if (size < 2) {
error("Not enough data for case 2");
}
// Skip (next word of input) * 2 bytes of output
c = READ_LE_UINT16(data) * 2;
data += 2;
currentPos += c;
size -= 2;
break;
case 3:
if (size < 2) {
error("Not enough data for case 3");
}
// Fill (next byte of input) * 2 of output with (next byte of input)
c = *(data++) * 2;
fill = *(data++);
memset(&_frameBufferC[currentPos], fill, c);
currentPos += c;
size -= 2;
break;
default:
// End of picture
eop = true;
break;
}
} else {
if (size < 2) {
error("Not enough data for count > 0");
}
bool backward = (flgs & 0x4) != 0;
bool backline = (flgs & 0x2) != 0;
bool previous = (flgs & 0x1) != 0;
int offset = READ_LE_UINT16(data);
data += 2;
size -= 2;
bool swap = (offset & 0x1) != 0;
offset = currentPos + (offset & 0xFFFE) - 0x8000;
if (offset < 0) {
error("Invalid offset");
}
byte *ptr;
if (previous) {
ptr = _frameBufferP;
} else {
ptr = _frameBufferC;
}
int shft1, shft2;
if (backline) {
const int twolinesabove = -(width * 2);
shft1 = twolinesabove + 1;
shft2 = 0;
} else {
shft1 = 0;
shft2 = 1;
}
if (swap) {
SWAP(shft1, shft2);
}
int src_inc = backward ? -2 : 2;
while (count--) {
byte b0 = ptr[offset + shft1];
byte b1 = ptr[offset + shft2];
_frameBufferC[currentPos++] = b0;
_frameBufferC[currentPos++] = b1;
offset += src_inc;
}
}
}
}
void HNMDecoder::HNM4VideoTrack::decodeInterframeA(byte *data, uint32 size) {
SWAP(_frameBufferC, _frameBufferP);
uint16 width = _surface.w;
bool eop = false;
uint32 currentPos = 0;
while (!eop) {
if (size < 1) {
warning("Not enough data in chunk for interframe block");
break;
}
byte countFlgs = *(data++);
size -= 1;
byte count = countFlgs & 0x3f;
byte flgs = (countFlgs >> 6) & 0x3;
if (count == 0) {
byte c;
switch (flgs) {
case 0:
if (size < 1) {
error("Not enough data for case 0");
}
// Move in image
c = *(data++);
currentPos += c;
size -= 1;
break;
case 1:
if (size < 2) {
error("Not enough data for case 1");
}
// New pixels
c = *(data++);
_frameBufferC[currentPos] = c;
c = *(data++);
_frameBufferC[currentPos + width] = c;
currentPos++;
size -= 2;
break;
case 2:
// New line
currentPos += width;
break;
case 3:
// End of picture
eop = true;
break;
default:
error("BUG: Shouldn't be here");
break;
}
} else {
if (size < 2) {
error("Not enough data for count > 0");
}
bool negative = (flgs & 0x2) != 0;
bool previous = (flgs & 0x1) != 0;
int offset = READ_LE_UINT16(data);
data += 2;
size -= 2;
if (negative) {
offset -= 0x10000;
}
offset += currentPos;
if (offset < 0) {
error("Invalid offset");
}
byte *ptr;
if (previous) {
ptr = _frameBufferP;
} else {
ptr = _frameBufferC;
}
memcpy(&_frameBufferC[currentPos], &ptr[offset], count);
memcpy(&_frameBufferC[currentPos + width], &ptr[offset + width], count);
currentPos += count;
}
}
}
void HNMDecoder::HNM4VideoTrack::decodeIntraframe(byte *data, uint32 size) {
Common::MemoryReadStream stream(data, size);
Image::HLZDecoder::decodeFrameInPlace(stream, size, _frameBufferC);
memcpy(_frameBufferP, _frameBufferC, (uint32)_surface.w * (uint32)_surface.h);
}
void HNMDecoder::HNM4VideoTrack::presentFrame(uint16 flags) {
int width = _surface.w;
int height = _surface.h;
if ((flags & 1) == 1) {
// High resolution HNM4A: no deinterlacing, use current image directly
_surface.setPixels(_frameBufferC);
} else if ((width % 4) == 0) {
// HNM4: deinterlacing must not alter the framebuffer as it will get reused as previous source for next frame
uint32 *input = (uint32 *)_frameBufferC;
uint32 *line0 = (uint32 *)_frameBufferF;
uint32 *line1 = (uint32 *)(_frameBufferF + width);
int count = (height) / 2;
while (count--) {
int i;
for (i = 0; i < width / 4; i++) {
uint32 p0 = *input++;
uint32 p4 = *input++;
#ifndef SCUMM_LITTLE_ENDIAN
*line0++ = ((p4 & 0xFF00) >> 8) | ((p4 & 0xFF000000) >> 16) |
((p0 & 0xFF00) << 8) | (p0 & 0xFF000000);
*line1++ = ((p0 & 0xFF0000) << 8) | ((p0 & 0xFF) << 16) |
((p4 & 0xFF0000) >> 8) | (p4 & 0xFF);
#else
*line0++ = (p0 & 0xFF) | ((p0 & 0xFF0000) >> 8) |
((p4 & 0xFF) << 16) | ((p4 & 0xFF0000) << 8);
*line1++ = ((p0 & 0xFF00) >> 8) | ((p0 & 0xFF000000) >> 16) |
((p4 & 0xFF00) << 8) | (p4 & 0xFF000000);
#endif
}
line0 += width / 4;
line1 += width / 4;
}
_surface.setPixels(_frameBufferF);
} else {
error("HNMDecoder::HNM4VideoTrack::postprocess(%x): Unexpected width: %d", flags, width);
}
}
void HNMDecoder::HNM5VideoTrack::decodeChunk(byte *data, uint32 size,
uint16 chunkType, uint16 flags) {
if (chunkType == MKTAG16('P', 'L')) {
decodePalette(data, size);
} else if (chunkType == MKTAG16('I', 'V')) {
decodeFrame(data, size);
} else {
error("HNM5: Got %d chunk: size %d", chunkType, size);
}
}
static inline byte *HNM5_getSourcePtr(byte *&data, uint32 &size,
byte *previous, byte *current, int16 pitch, byte currentMode) {
int32 offset;
byte offb;
#define HNM5_DECODE_OFFSET_CST(src, constant_off) \
offset = constant_off + READ_LE_UINT16(data); \
data += 2; \
size -= 2; \
return (src + offset)
#define HNM5_DECODE_OFFSET(src, xbits, xbase, ybase) \
offb = *(data++); \
size -= 1; \
offset = ((offb >> xbits) + ybase) * pitch + \
(offb & ((1 << xbits) - 1)) + xbase; \
return (src + offset)
switch (currentMode) {
case 2:
HNM5_DECODE_OFFSET_CST(previous, -32768);
case 3:
HNM5_DECODE_OFFSET_CST(previous, -32768);
case 4:
HNM5_DECODE_OFFSET_CST(previous, -32768);
case 5:
HNM5_DECODE_OFFSET(previous, 4, -8, -8);
case 6:
HNM5_DECODE_OFFSET(previous, 4, -8, -8);
case 7:
HNM5_DECODE_OFFSET(previous, 4, -8, -8);
case 8:
HNM5_DECODE_OFFSET(previous, 4, -2, -8);
case 9:
HNM5_DECODE_OFFSET(previous, 4, -14, -8);
case 10:
HNM5_DECODE_OFFSET(previous, 4, -8, -2);
case 11:
HNM5_DECODE_OFFSET(previous, 4, -8, -14);
case 12:
HNM5_DECODE_OFFSET(previous, 4, -2, -2);
case 13:
HNM5_DECODE_OFFSET(previous, 4, -14, -2);
case 14:
HNM5_DECODE_OFFSET(previous, 4, -2, -14);
case 15:
HNM5_DECODE_OFFSET(previous, 4, -14, -14);
case 16:
HNM5_DECODE_OFFSET(previous, 4, -2, -8);
case 17:
HNM5_DECODE_OFFSET(previous, 4, -14, -8);
case 18:
HNM5_DECODE_OFFSET(previous, 4, -8, -2);
case 19:
HNM5_DECODE_OFFSET(previous, 4, -8, -14);
case 20:
HNM5_DECODE_OFFSET(previous, 4, -2, -2);
case 21:
HNM5_DECODE_OFFSET(previous, 4, -14, -2);
case 22:
HNM5_DECODE_OFFSET(previous, 4, -2, -14);
case 23:
HNM5_DECODE_OFFSET(previous, 4, -14, -14);
case 24:
HNM5_DECODE_OFFSET(previous, 4, -2, -8);
case 25:
HNM5_DECODE_OFFSET(previous, 4, -14, -8);
case 26:
HNM5_DECODE_OFFSET(previous, 4, -8, -2);
case 27:
HNM5_DECODE_OFFSET(previous, 4, -8, -14);
case 28:
HNM5_DECODE_OFFSET(previous, 4, -2, -2);
case 29:
HNM5_DECODE_OFFSET(previous, 4, -14, -2);
case 30:
HNM5_DECODE_OFFSET(previous, 4, -2, -14);
case 31:
HNM5_DECODE_OFFSET(previous, 4, -14, -14);
case 32:
HNM5_DECODE_OFFSET_CST(current, -65536);
case 33:
HNM5_DECODE_OFFSET(current, 5, -16, -8);
case 34:
HNM5_DECODE_OFFSET(current, 4, -8, -16);
case 35:
HNM5_DECODE_OFFSET(current, 4, -24, -16);
case 36:
HNM5_DECODE_OFFSET(current, 4, 8, -16);
case 37:
HNM5_DECODE_OFFSET(current, 3, -4, -32);
case 38:
HNM5_DECODE_OFFSET(current, 3, -12, -32);
case 39:
HNM5_DECODE_OFFSET(current, 3, 4, -32);
case 40:
HNM5_DECODE_OFFSET_CST(current, -65536);
case 41:
HNM5_DECODE_OFFSET(current, 5, -16, -8);
case 42:
HNM5_DECODE_OFFSET(current, 4, -8, -16);
case 43:
HNM5_DECODE_OFFSET(current, 4, -24, -16);
case 44:
HNM5_DECODE_OFFSET(current, 4, 8, -16);
case 45:
HNM5_DECODE_OFFSET(current, 3, -4, -32);
case 46:
HNM5_DECODE_OFFSET(current, 3, -12, -32);
case 47:
HNM5_DECODE_OFFSET(current, 3, 4, -32);
default:
error("BUG: Invalid offset mode");
}
#undef HNM5_DECODE_OFFSET_CST
#undef HNM5_DECODE_OFFSET
}
static inline void HNM5_copy(byte *dst, byte *src, int16 pitch,
byte copyMode, byte width, byte height) {
switch (copyMode) {
case 0:
// Copy
for (; height > 0; height--) {
memcpy(dst, src, width);
dst += pitch;
src += pitch;
}
break;
case 1:
// Horizontal reverse
for (; height > 0; height--) {
byte *dp = dst;
byte *sp = src;
for (byte col = width; col > 0; col--) {
*(dp++) = *(sp--);
}
dst += pitch;
src += pitch;
}
break;
case 2:
// Vertical reverse
for (; height > 0; height--) {
memcpy(dst, src, width);
dst += pitch;
src -= pitch;
}
break;
case 3:
// Horiz-Vert reverse
for (; height > 0; height--) {
byte *dp = dst;
byte *sp = src;
for (byte col = width; col > 0; col--) {
*(dp++) = *(sp--);
}
dst += pitch;
src -= pitch;
}
break;
case 4:
// Swap
for (; height > 0; height--) {
byte *dp = dst;
byte *sp = src;
for (byte col = width; col > 0; col--) {
*dp = *sp;
dp++;
sp += pitch;
}
dst += pitch;
src += 1;
}
break;
case 5:
// Swap Horiz-Reverse
for (; height > 0; height--) {
byte *dp = dst;
byte *sp = src;
for (byte col = width; col > 0; col--) {
*dp = *sp;
dp++;
sp -= pitch;
}
dst += pitch;
src += 1;
}
break;
case 6:
// Swap Vert-Reverse
for (; height > 0; height--) {
byte *dp = dst;
byte *sp = src;
for (byte col = width; col > 0; col--) {
*dp = *sp;
dp++;
sp += pitch;
}
dst += pitch;
src -= 1;
}
break;
case 7:
// Swap Vert-Reverse
for (; height > 0; height--) {
byte *dp = dst;
byte *sp = src;
for (byte col = width; col > 0; col--) {
*dp = *sp;
dp++;
sp -= pitch;
}
dst += pitch;
src -= 1;
}
break;
default:
error("BUG: Invalid copy mode");
return;
}
}
static const byte HNM5_WIDTHS[3][32] = {
{
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 44, 48, 52, 56
}, /* 2 */
{
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44
}, /* 3 */
{
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, 28, 30, 32, 34, 36, 38
}, /* 4 */
};
void HNMDecoder::HNM5VideoTrack::decodeFrame(byte *data, uint32 size) {
SWAP(_frameBufferC, _frameBufferP);
uint16 pitch = _surface.pitch;
bool eop = false;
byte height = -1;
byte currentMode = -1;
uint32 currentPos = 0;
while (!eop) {
if (size < 1) {
warning("Not enough data in chunk for frame block");
break;
}
byte opcode = *(data++);
size -= 1;
if (opcode == 0x20) {
assert(height != byte(-1));
if (size < 1) {
error("Not enough data for opcode 0x20");
}
uint width = *(data++);
size -= 1;
width++;
for (byte row = 0; row < height; row++) {
memcpy(&_frameBufferC[currentPos + row * pitch], &_frameBufferP[currentPos + row * pitch], width);
}
currentPos += width;
} else if (opcode == 0x60) {
// Maximal pixels height is 4
assert(height != byte(-1) && height <= 4);
if (size < height) {
error("Not enough data for opcode 0x60");
}
for (byte row = 0; row < height; row++) {
_frameBufferC[currentPos + row * pitch] = *(data++);
}
size -= height;
currentPos += 1;
} else if (opcode == 0xA0) {
assert(height != byte(-1));
if (size < 1) {
error("Not enough data for opcode 0x20");
}
uint width = *(data++);
size -= 1;
width += 2;
if (size < height * width) {
error("Not enough data for opcode 0xA0");
}
for (uint col = 0; col < width; col++) {
for (byte row = 0; row < height; row++) {
_frameBufferC[currentPos + row * pitch + col] = *(data++);
}
}
size -= height * width;
currentPos += width;
} else if (opcode == 0xE0) {
if (size < 1) {
error("Not enough data for opcode 0xE0");
}
byte subop = *(data++);
size -= 1;
if (subop == 0x00) {
assert(height != byte(-1));
if (size < 2) {
error("Not enough data for opcode 0xE0 0x00");
}
uint width = *(data++);
byte px = *(data++);
size -= 2;
width += 1;
for (byte row = 0; row < height; row++) {
memset(&_frameBufferC[currentPos + row * pitch], px, width);
}
currentPos += width;
} else if (subop == 0x01) {
if (height != byte(-1)) {
currentPos += (height - 1) * pitch;
}
eop = true;
} else {
// Reconfigure decoder at line start
assert((currentPos % pitch) == 0);
assert(subop < 48);
if (height != byte(-1)) {
currentPos += (height - 1) * pitch;
}
currentMode = subop;
if (( 8 <= subop && subop <= 15) ||
(32 <= subop && subop <= 39) ||
(subop == 2) || (subop == 5)) {
height = 2;
} else if ((16 <= subop && subop <= 23) ||
(40 <= subop && subop <= 47) ||
(subop == 3) || (subop == 6)) {
height = 3;
} else if ((24 <= subop && subop <= 31) ||
(subop == 4) || (subop == 7)) {
height = 4;
}
}
} else {
assert(height != byte(-1));
assert(2 <= height && height <= 4);
byte index = opcode & 0x1f;
byte copyMode = (opcode >> 5) & 0x7;
byte width = HNM5_WIDTHS[height - 2][index];
// HNM5_getSourcePtr can consume 1 byte but the data can not end like this so check for maximum
if (size < 2) {
error("Not enough data for opcode 0x%02X", opcode);
}
byte *src = HNM5_getSourcePtr(data, size, _frameBufferP, _frameBufferC, pitch, currentMode);
HNM5_copy(_frameBufferC + currentPos, src + currentPos, pitch, copyMode, width, height);
currentPos += width;
}
}
_surface.setPixels(_frameBufferC);
}
HNMDecoder::DPCMAudioTrack::DPCMAudioTrack(uint16 format, uint16 bits, uint sampleRate, bool stereo,
Audio::Mixer::SoundType soundType) : AudioTrack(soundType), _audioStream(nullptr),
_gotLUT(false), _lastSampleL(0), _lastSampleR(0), _sampleRate(sampleRate), _stereo(stereo) {
if (bits != 16) {
error("Unsupported audio bits");
}
if (format != 2) {
warning("Unsupported %d audio format", format);
}
// Format 2 is 16-bits DPCM
_audioStream = Audio::makeQueuingAudioStream(_sampleRate, _stereo);
}
HNMDecoder::DPCMAudioTrack::~DPCMAudioTrack() {
delete _audioStream;
}
uint32 HNMDecoder::DPCMAudioTrack::decodeSound(byte *data, uint32 size) {
if (!_gotLUT) {
if (size < 256 * sizeof(*_lut)) {
error("Invalid first sound chunk");
}
memcpy(_lut, data, 256 * sizeof(*_lut));
data += 256 * sizeof(*_lut);
size -= 256 * sizeof(*_lut);
#ifndef SCUMM_LITTLE_ENDIAN
for (uint i = 0; i < 256; i++) {
_lut[i] = FROM_LE_16(_lut[i]);
}
#endif
_gotLUT = true;
}
if (size == 0) {
return 0;
}
uint16 *out = (uint16 *)malloc(size * sizeof(*out));
uint16 *p = out;
uint32 numSamples = size;
byte flags = Audio::FLAG_16BITS;
#ifdef SCUMM_LITTLE_ENDIAN
flags |= Audio::FLAG_LITTLE_ENDIAN;
#endif
if (_audioStream->isStereo()) {
numSamples /= 2;
uint16 sampleL = _lastSampleL;
uint16 sampleR = _lastSampleR;
byte deltaId;
for (uint32 i = 0; i < numSamples; i++, p += 2) {
deltaId = *(data++);
sampleL += _lut[deltaId];
deltaId = *(data++);
sampleR += _lut[deltaId];
p[0] = sampleL;
p[1] = sampleR;
}
_lastSampleL = sampleL;
_lastSampleR = sampleR;
flags |= Audio::FLAG_STEREO;
} else {
uint16 sample = _lastSampleL;
byte deltaId;
for (uint32 i = 0; i < numSamples; i++, p++) {
deltaId = *(data++);
sample += _lut[deltaId];
*p = sample;
}
_lastSampleL = sample;
}
_audioStream->queueBuffer((byte *)out, size * sizeof(*out), DisposeAfterUse::YES, flags);
return numSamples;
}
} // End of namespace Video
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