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COMMON: FORMATS: Implement vmhd atom parsing for QuickTime movies

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This commit implements vmhd (Video Media Information Header) atom parsing for QuickTime movies.
It contains information about the video track's graphics mode and opcolor.
This commit is contained in:
Krish 2024-06-18 19:13:53 +05:30 committed by Eugene Sandulenko
parent fc34902998
commit d704b8e959
2 changed files with 29 additions and 1 deletions
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14
common/formats/quicktime.cpp
View File

@ -164,7 +164,7 @@ void QuickTimeParser::initParseTable() {
{ &QuickTimeParser::readDefault, MKTAG('u', 'd', 't', 'a') },
{ &QuickTimeParser::readCTYP, MKTAG('c', 't', 'y', 'p') },
{ &QuickTimeParser::readNAVG, MKTAG('N', 'A', 'V', 'G') },
{ &QuickTimeParser::readLeaf, MKTAG('v', 'm', 'h', 'd') },
{ &QuickTimeParser::readVMHD, MKTAG('v', 'm', 'h', 'd') },
{ &QuickTimeParser::readCMOV, MKTAG('c', 'm', 'o', 'v') },
{ &QuickTimeParser::readWAVE, MKTAG('w', 'a', 'v', 'e') },
{ &QuickTimeParser::readESDS, MKTAG('e', 's', 'd', 's') },
@ -667,6 +667,16 @@ int QuickTimeParser::readSTTS(Atom atom) {
return 0;
}
int QuickTimeParser::readVMHD(Atom atom) {
Track *track = _tracks.back();
_fd->readUint32BE(); // version + flags
track->graphicsMode = (GraphicsMode)_fd->readUint16BE();
_fd->readMultipleBE(track->opcolor);
return 0;
}
int QuickTimeParser::readSTCO(Atom atom) {
Track *track = _tracks.back();
@ -1037,6 +1047,8 @@ QuickTimeParser::Track::Track() {
mediaDuration = 0;
nlvlFrom = -1;
nlvlTo = -1;
graphicsMode = GraphicsMode::COPY;
opcolor[0] = opcolor[1] = opcolor[2] = 0;
}
QuickTimeParser::Track::~Track() {

16
common/formats/quicktime.h
View File

@ -144,6 +144,18 @@ protected:
CODEC_TYPE_MIDI
};
enum class GraphicsMode {
COPY = 0x0, // Directly copy the source image over the destination.
DITHER_COPY = 0x40, // Dither the image (if needed), otherwise copy.
BLEND = 0x20, // Blend source and destination pixel colors using opcolor values.
TRANSPARENT = 0x24, // Replace destination with source if not equal to opcolor.
STRAIGHT_ALPHA = 0x100, // Blend source and destination pixels, with the proportion controlled by the alpha channel.
PREMUL_WHITE_ALPHA = 0x101, // Blend after removing pre-multiplied white from the source.
PREMUL_BLACK_ALPHA = 0x102, // Blend after removing pre-multiplied black from the source.
STRAIGHT_ALPHA_BLEND = 0x104, // Similar to straight alpha, but the alpha for each channel is combined with the corresponding opcolor channel.
COMPOSITION = 0x103 // Render offscreen and then dither-copy to the main screen (tracks only).
};
struct PanoramaNode {
uint32 nodeID;
uint32 timestamp;
@ -195,6 +207,9 @@ protected:
int16 nlvlTo;
PanoramaInformation panoInfo;
GraphicsMode graphicsMode; // Transfer mode
uint16 opcolor[3]; // RGB values used in the transfer mode specified by graphicsMode.
};
enum class MovieType {
@ -277,6 +292,7 @@ private:
int readSTSS(Atom atom);
int readSTSZ(Atom atom);
int readSTTS(Atom atom);
int readVMHD(Atom atom);
int readCMOV(Atom atom);
int readWAVE(Atom atom);
int readESDS(Atom atom);