mirror of
https://github.com/JetSetIlly/Gopher2600.git
synced 2024-06-02 20:18:20 -04:00
implemented moviecart 2 format
This commit is contained in:
JetSetIlly
parent
3cff5da258
commit
889c19b099
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@ -75,6 +75,10 @@ const (
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addrTransportDirection = 0x880
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addrTransportButtons = 0x894
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addrSetVSyncSize = 0xaa3
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addrTitleGap1 = 0xb2c
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addrTitleGap2 = 0xb40
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// fillAddrBlankLines().
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addrAudioBank = 0xb80
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)
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@ -34,19 +34,7 @@ const (
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)
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// size of each video field in bytes.
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const fieldSize = 2560
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// offsets into each part of the field (audio, color, etc.)
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const (
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offsetVersion = 0 // nolint
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offsetFieldNumber = 4
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offsetAudioData = 7
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offsetGraphData = 269
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offsetTimecodeData = 1229
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offsetColorData = 1289
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offsetColorBkData = 2249
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offsetEndData = 2441
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)
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const fieldSize = 4096
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// levels for both volume and brightness.
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const (
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@ -109,6 +97,17 @@ const (
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// a frame consists of two interlaced fields.
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const numFields = 2
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type format struct {
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// version [4]byte // ('M', 'V', 'C', '0')
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// format byte // (1-------)
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// timecode [4]byte // (hour, minute, second, frame)
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vsync byte // eg 3
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vblank byte // eg 37
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overscan byte // eg 30
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visible byte // eg 192
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rate byte // eg 60
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}
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type state struct {
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// the state of the address pins
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a7 bool
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@ -123,7 +122,7 @@ type state struct {
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// data for current field and the indexes into it
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streamBuffer [numFields][]byte
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streamField int
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streamIndex int
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streamAudio int
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streamGraph int
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streamTimecode int
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@ -131,6 +130,16 @@ type state struct {
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streamBackground int
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endOfStream bool
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// field number is part of the timecode stream. this is the extracted value
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fieldNumber int
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// odd field uses the frame component of the timecode stream to decide if
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// the field is an odd number or not
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oddField bool
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// format for each field. parsed data from streamBuffer
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format [numFields]format
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// the audio value to carry to the next frame
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audioCarry uint8
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@ -143,14 +152,6 @@ type state struct {
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// how many lines remaining for the current TIA frame
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lines int
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// field number. a frame is made up of two fields. when playback is paused
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// the fieldNumber will flip between two consecutive values producing one
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// frame of two fields.
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fieldNumber int
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oddField bool
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blankLine bool
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// state machine
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state stateMachineCondition
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@ -242,7 +243,8 @@ func (s *state) initialise() {
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}
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type Moviecart struct {
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env *environment.Environment
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env *environment.Environment
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specID string
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mappingID string
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@ -256,7 +258,7 @@ func NewMoviecart(env *environment.Environment, loader cartridgeloader.Loader) (
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cart := &Moviecart{
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env: env,
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loader: loader.StreamedData,
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mappingID: "MC",
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mappingID: "MVC",
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}
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cart.state = newState()
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@ -277,6 +279,9 @@ func NewMoviecart(env *environment.Environment, loader cartridgeloader.Loader) (
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copy(cart.banks[len(coreData)*2:], coreData)
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copy(cart.banks[len(coreData)*3:], coreData)
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// field starts off in the end position
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cart.state.streamIndex = 1
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return cart, nil
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}
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@ -308,6 +313,9 @@ func (cart *Moviecart) Reset() {
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// Access implements the mapper.CartMapper interface.
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func (cart *Moviecart) Access(addr uint16, _ bool) (data uint8, mask uint8, err error) {
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// TODO: this is called far too frequently but it'll do for now
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cart.setConsoleTiming()
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return cart.state.sram[addr&0x3ff], mapper.CartDrivenPins, nil
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}
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@ -506,7 +514,7 @@ func (cart *Moviecart) updateButtons() {
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func (cart *Moviecart) updateTransport() {
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// alternate between direction and button servicing
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if cart.state.streamField == 1 {
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if cart.state.streamIndex == 1 {
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cart.updateDirection()
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} else {
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cart.updateButtons()
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@ -518,7 +526,7 @@ func (cart *Moviecart) updateTransport() {
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// move movie stream if playback is not paused.
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//
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// frame-by-frame stepping when playback is paused is handled in the
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// readField() function
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// nextField() function
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if !cart.state.paused {
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if cart.state.endOfStream {
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if cart.state.fieldAdv < 0 {
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@ -549,7 +557,7 @@ func (cart *Moviecart) runStateMachine() {
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if cart.state.lines == 11 {
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cart.state.osdDuration--
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cart.state.osdDisplay = osdTime
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cart.state.osdIdx = offsetTimecodeData
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cart.state.osdIdx = cart.state.streamTimecode
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}
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default:
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@ -584,17 +592,15 @@ func (cart *Moviecart) runStateMachine() {
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cart.state.lines--
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cart.state.state = stateMachineRight
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} else {
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cart.state.blankLine = cart.state.oddField
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cart.fillAddrLeftLine(false)
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cart.fillAddrEndLines()
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cart.fillAddrBlankLines()
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// swap stream indexes
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cart.state.streamField++
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if cart.state.streamField >= numFields {
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cart.state.streamField = 0
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cart.state.streamIndex++
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if cart.state.streamIndex >= numFields {
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cart.state.streamIndex = 0
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}
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cart.updateTransport()
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@ -605,11 +611,10 @@ func (cart *Moviecart) runStateMachine() {
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break // switch
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}
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cart.readField()
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cart.state.lines = 191
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cart.nextField()
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cart.state.lines = int(cart.state.format[cart.state.streamIndex].visible - 1)
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cart.state.state = stateMachineRight
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cart.state.osdDisplay = osdNone
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cart.state.blankLine = false
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}
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}
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@ -622,13 +627,13 @@ func (cart *Moviecart) fillAddrRightLine() {
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cart.writeGraph(addrSetGData8 + 1)
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cart.writeGraph(addrSetGData9 + 1)
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cart.writeColorStream(addrSetGCol5 + 1) // col 1/9
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cart.writeColorStream(addrSetGCol6 + 1) // col 3/9
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cart.writeColorStream(addrSetGCol7 + 1) // col 5/9
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cart.writeColorStream(addrSetGCol8 + 1) // col 7/9
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cart.writeColorStream(addrSetGCol9 + 1) // col 9/9
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cart.writeColor(addrSetGCol5 + 1) // col 1/9
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cart.writeColor(addrSetGCol6 + 1) // col 3/9
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cart.writeColor(addrSetGCol7 + 1) // col 5/9
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cart.writeColor(addrSetGCol8 + 1) // col 7/9
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cart.writeColor(addrSetGCol9 + 1) // col 9/9
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cart.writeBackgroundStream(addrSetBkColR+1, true)
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cart.writeBackground(addrSetBkColR+1, true)
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// cart.writeBackgroundStream(addrSetPfColR+1, false)
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}
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@ -641,14 +646,14 @@ func (cart *Moviecart) fillAddrLeftLine(again bool) {
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cart.writeGraph(addrSetGData3 + 1)
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cart.writeGraph(addrSetGData4 + 1)
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cart.writeColorStream(addrSetGCol0 + 1) // col 0/9
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cart.writeColorStream(addrSetGCol1 + 1) // col 2/9
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cart.writeColorStream(addrSetGCol2 + 1) // col 4/9
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cart.writeColorStream(addrSetGCol3 + 1) // col 6/9
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cart.writeColorStream(addrSetGCol4 + 1) // col 8/9
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cart.writeColor(addrSetGCol0 + 1) // col 0/9
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cart.writeColor(addrSetGCol1 + 1) // col 2/9
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cart.writeColor(addrSetGCol2 + 1) // col 4/9
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cart.writeColor(addrSetGCol3 + 1) // col 6/9
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cart.writeColor(addrSetGCol4 + 1) // col 8/9
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// cart.writeBackgroundStream(addrSetBkColL+1, false)
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cart.writeBackgroundStream(addrSetPfColL+1, true)
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cart.writeBackground(addrSetPfColL+1, true)
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if again {
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cart.writeJMPaddr(addrPickContinue+1, addrRightLine)
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@ -662,15 +667,15 @@ func (cart *Moviecart) fillAddrEndLines() {
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// different details for the end kernel every other frame
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if cart.state.oddField {
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cart.write8bit(addrSetOverscanSize+1, 29)
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cart.write8bit(addrSetVBlankSize+1, 36)
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cart.write8bit(addrSetOverscanSize+1, cart.state.format[cart.state.streamIndex].overscan-1)
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cart.write8bit(addrSetVBlankSize+1, cart.state.format[cart.state.streamIndex].vblank-1)
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} else {
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cart.state.audioCarry = cart.state.streamBuffer[cart.state.streamField][cart.state.streamAudio]
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cart.write8bit(addrSetOverscanSize+1, 30)
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cart.write8bit(addrSetVBlankSize+1, 37)
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cart.state.audioCarry = cart.state.streamBuffer[cart.state.streamIndex][cart.state.streamAudio]
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cart.write8bit(addrSetOverscanSize+1, cart.state.format[cart.state.streamIndex].overscan)
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cart.write8bit(addrSetVBlankSize+1, cart.state.format[cart.state.streamIndex].vblank)
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}
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if cart.state.streamField == 0 {
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if cart.state.streamIndex == 0 {
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cart.writeJMPaddr(addrPickTransport+1, addrTransportDirection)
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} else {
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cart.writeJMPaddr(addrPickTransport+1, addrTransportButtons)
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@ -678,34 +683,33 @@ func (cart *Moviecart) fillAddrEndLines() {
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}
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func (cart *Moviecart) fillAddrBlankLines() {
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const blankLineSize = 69
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blankLineSize := int(cart.state.format[cart.state.streamIndex].overscan + cart.state.format[cart.state.streamIndex].vsync + cart.state.format[cart.state.streamIndex].vblank - 1)
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// slightly different number of trailing blank line every other frame
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if !cart.state.oddField {
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cart.writeAudioData(addrAudioBank, cart.state.audioCarry)
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for i := uint16(1); i < blankLineSize+1; i++ {
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cart.writeAudio(addrAudioBank + i)
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for i := 1; i < blankLineSize+1; i++ {
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cart.writeAudio(addrAudioBank + uint16(i))
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}
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} else {
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for i := uint16(0); i < blankLineSize-1; i++ {
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cart.writeAudio(addrAudioBank + i)
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for i := 0; i < blankLineSize-1; i++ {
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cart.writeAudio(addrAudioBank + uint16(i))
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}
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}
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}
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func (cart *Moviecart) writeAudio(addr uint16) {
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b := cart.state.streamBuffer[cart.state.streamField][cart.state.streamAudio]
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b := cart.state.streamBuffer[cart.state.streamIndex][cart.state.streamAudio]
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cart.state.streamAudio++
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cart.writeAudioData(addr, b)
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}
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func (cart *Moviecart) writeAudioData(addr uint16, data uint8) {
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b := volumeLevels[cart.state.volume][data]
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// output silence if playback is paused or we have reached the end of the stream
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if cart.state.paused || cart.state.endOfStream || cart.state.streamChunk == 0 {
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cart.write8bit(addr, 0)
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} else {
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b := volumeLevels[cart.state.volume][data]
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cart.write8bit(addr, b)
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}
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}
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@ -716,8 +720,8 @@ func (cart *Moviecart) writeGraph(addr uint16) {
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// check if we need to draw OSD using stats graphics data
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switch cart.state.osdDisplay {
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case osdTime:
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if cart.state.osdIdx < offsetColorData {
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b = cart.state.streamBuffer[cart.state.streamField][cart.state.osdIdx]
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if cart.state.osdIdx < cart.state.streamColor {
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b = cart.state.streamBuffer[cart.state.streamIndex][cart.state.osdIdx]
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cart.state.osdIdx++
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}
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case osdLevels:
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@ -753,15 +757,15 @@ func (cart *Moviecart) writeGraph(addr uint16) {
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}
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case osdNone:
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// use graphics from current field
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b = cart.state.streamBuffer[cart.state.streamField][cart.state.streamGraph]
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b = cart.state.streamBuffer[cart.state.streamIndex][cart.state.streamGraph]
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cart.state.streamGraph++
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}
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cart.write8bit(addr, b)
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}
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func (cart *Moviecart) writeColorStream(addr uint16) {
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b := cart.state.streamBuffer[cart.state.streamField][cart.state.streamColor]
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func (cart *Moviecart) writeColor(addr uint16) {
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b := cart.state.streamBuffer[cart.state.streamIndex][cart.state.streamColor]
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cart.state.streamColor++
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// adjust brightness
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@ -783,17 +787,13 @@ func (cart *Moviecart) writeColorStream(addr uint16) {
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b &= 0x0f
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}
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if cart.state.blankLine {
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b = 0x00
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}
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cart.write8bit(addr, b)
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}
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func (cart *Moviecart) writeBackgroundStream(addr uint16, readCol bool) {
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func (cart *Moviecart) writeBackground(addr uint16, readCol bool) {
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var b byte
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if readCol && cart.state.osdDisplay == osdNone {
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b = cart.state.streamBuffer[cart.state.streamField][cart.state.streamBackground]
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b = cart.state.streamBuffer[cart.state.streamIndex][cart.state.streamBackground]
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cart.state.streamBackground++
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}
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@ -815,15 +815,20 @@ func (cart *Moviecart) writeBackgroundStream(addr uint16, readCol bool) {
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const chunkSize = 8 * 512
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func (cart *Moviecart) readField() {
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// nextField is an amalgamation of the readField() and swapField() functions in
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// the reference implementation by Rob Bairos. in the reference swapField() is
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// called during the stateMachineLeft phase of the state machine and readField()
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// is called during the stateMachineNewField phase. it was found that this
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// division was unnecessary in this implementation
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func (cart *Moviecart) nextField() {
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// the usual playback condition
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if !cart.state.paused && cart.state.streamChunk > 0 {
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if !cart.state.paused && cart.state.streamChunk >= 0 {
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dataOffset := cart.state.streamChunk * chunkSize
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_, err := cart.loader.Seek(int64(dataOffset), io.SeekStart)
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if err != nil {
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logger.Logf("MVC", "error reading field: %v", err)
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}
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n, err := cart.loader.Read(cart.state.streamBuffer[cart.state.streamField])
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n, err := cart.loader.Read(cart.state.streamBuffer[cart.state.streamIndex])
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if err != nil {
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logger.Logf("MVC", "error reading field: %v", err)
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}
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@ -848,32 +853,88 @@ func (cart *Moviecart) readField() {
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if err != nil {
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logger.Logf("MVC", "error reading field: %v", err)
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}
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// version string check
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if cart.state.streamBuffer[fld][0] != 'M' ||
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cart.state.streamBuffer[fld][1] != 'V' ||
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cart.state.streamBuffer[fld][2] != 'C' ||
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cart.state.streamBuffer[fld][3] != 0x00 {
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logger.Logf("MVC", "unrecognised version string in chunk %d", cart.state.streamChunk)
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}
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}
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}
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// frame number and odd parity check. we recalculate these every field
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// regardless of whether we've read new data in.
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cart.state.fieldNumber = int(cart.state.streamBuffer[cart.state.streamField][offsetFieldNumber]) << 16
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cart.state.fieldNumber |= int(cart.state.streamBuffer[cart.state.streamField][offsetFieldNumber+1]) << 8
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cart.state.fieldNumber |= int(cart.state.streamBuffer[cart.state.streamField][offsetFieldNumber+2])
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cart.state.oddField = cart.state.fieldNumber&0x01 == 0x01
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// magic string check
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if cart.state.streamBuffer[cart.state.streamIndex][0] != 'M' ||
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cart.state.streamBuffer[cart.state.streamIndex][1] != 'V' ||
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cart.state.streamBuffer[cart.state.streamIndex][2] != 'C' ||
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cart.state.streamBuffer[cart.state.streamIndex][3] != 0x00 {
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logger.Logf("MVC", "unrecognised version string in chunk %d", cart.state.streamChunk)
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return
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}
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// reset stream indexes
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cart.state.streamAudio = offsetAudioData
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cart.state.streamGraph = offsetGraphData
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cart.state.streamTimecode = offsetTimecodeData
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cart.state.streamColor = offsetColorData
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cart.state.streamBackground = offsetColorBkData
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// version number
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switch cart.state.streamBuffer[cart.state.streamIndex][4] {
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case 0x80:
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cart.state.format[cart.state.streamIndex].vsync = byte(cart.state.streamBuffer[cart.state.streamIndex][9])
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cart.state.format[cart.state.streamIndex].vblank = byte(cart.state.streamBuffer[cart.state.streamIndex][10])
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cart.state.format[cart.state.streamIndex].overscan = byte(cart.state.streamBuffer[cart.state.streamIndex][11])
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cart.state.format[cart.state.streamIndex].visible = byte(cart.state.streamBuffer[cart.state.streamIndex][12])
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cart.state.format[cart.state.streamIndex].rate = byte(cart.state.streamBuffer[cart.state.streamIndex][13])
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lines := int(cart.state.format[cart.state.streamIndex].vsync) +
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int(cart.state.format[cart.state.streamIndex].vblank) +
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int(cart.state.format[cart.state.streamIndex].visible) +
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int(cart.state.format[cart.state.streamIndex].overscan)
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cart.state.streamAudio = 14
|
||||
cart.state.streamGraph = cart.state.streamAudio + lines
|
||||
cart.state.streamColor = cart.state.streamGraph + 5*int(cart.state.format[cart.state.streamIndex].visible)
|
||||
cart.state.streamBackground = cart.state.streamColor + 5*int(cart.state.format[cart.state.streamIndex].visible)
|
||||
cart.state.streamTimecode = cart.state.streamBackground + int(cart.state.format[cart.state.streamIndex].visible)
|
||||
|
||||
cart.state.fieldNumber = int(cart.state.streamBuffer[cart.state.streamIndex][6]) << 16
|
||||
cart.state.fieldNumber |= int(cart.state.streamBuffer[cart.state.streamIndex][7]) << 8
|
||||
cart.state.fieldNumber |= int(cart.state.streamBuffer[cart.state.streamIndex][8])
|
||||
cart.state.oddField = cart.state.fieldNumber&0x01 != 0x01
|
||||
|
||||
case 0x00:
|
||||
// offsets into each part of the field (audio, color, etc.)
|
||||
const (
|
||||
offsetVersion = 0
|
||||
offsetFieldNumber = 4
|
||||
offsetAudioData = 7
|
||||
offsetGraphData = 269
|
||||
offsetTimecodeData = 1229
|
||||
offsetColorData = 1289
|
||||
offsetColorBkData = 2249
|
||||
offsetEndData = 2441
|
||||
)
|
||||
|
||||
cart.state.format[cart.state.streamIndex].vsync = 3
|
||||
cart.state.format[cart.state.streamIndex].vblank = 37
|
||||
cart.state.format[cart.state.streamIndex].overscan = 30
|
||||
cart.state.format[cart.state.streamIndex].visible = 192
|
||||
|
||||
// reset stream indexes
|
||||
cart.state.streamAudio = offsetAudioData
|
||||
cart.state.streamGraph = offsetGraphData
|
||||
cart.state.streamTimecode = offsetTimecodeData
|
||||
cart.state.streamColor = offsetColorData
|
||||
cart.state.streamBackground = offsetColorBkData
|
||||
|
||||
cart.state.fieldNumber = int(cart.state.streamBuffer[cart.state.streamIndex][offsetFieldNumber]) << 16
|
||||
cart.state.fieldNumber |= int(cart.state.streamBuffer[cart.state.streamIndex][offsetFieldNumber+1]) << 8
|
||||
cart.state.fieldNumber |= int(cart.state.streamBuffer[cart.state.streamIndex][offsetFieldNumber+2])
|
||||
cart.state.oddField = cart.state.fieldNumber&0x01 == 0x01
|
||||
}
|
||||
|
||||
// masking of partial lines at top and bottom of field. this is different to
|
||||
// how it is done in the reference implementation by Rob Bairos, which
|
||||
// calls blankPartialLines() during the stateMachineLeft phase
|
||||
if cart.state.oddField {
|
||||
for i := 0; i < 5; i++ {
|
||||
cart.state.streamBuffer[1][cart.state.streamBackground-i-1] = 0
|
||||
}
|
||||
cart.state.streamBuffer[1][cart.state.streamTimecode-1] = 0
|
||||
} else {
|
||||
for i := 0; i < 5; i++ {
|
||||
cart.state.streamBuffer[0][cart.state.streamColor+i] = 0
|
||||
}
|
||||
cart.state.streamBuffer[0][cart.state.streamBackground] = 0
|
||||
}
|
||||
|
||||
// cart.state.streamBackground++
|
||||
if cart.state.oddField {
|
||||
cart.state.streamBackground++
|
||||
}
|
||||
|
|
@ -893,3 +954,36 @@ func (cart *Moviecart) writeJMPaddr(addr uint16, jmpAddr uint16) {
|
|||
cart.state.sram[addr&0x3ff] = uint8(jmpAddr & 0xff)
|
||||
cart.state.sram[(addr+1)&0x3ff] = uint8(jmpAddr>>8) | 0x10
|
||||
}
|
||||
|
||||
// adjust program to reflect console timing
|
||||
func (cart *Moviecart) setConsoleTiming() {
|
||||
id := cart.env.TV.GetSpecID()
|
||||
|
||||
// do nothing if specification hasn't changed
|
||||
if cart.specID == id {
|
||||
return
|
||||
}
|
||||
|
||||
const rainbowHeight = 30
|
||||
const titleHeight = 12
|
||||
|
||||
var lines uint8
|
||||
|
||||
switch id {
|
||||
case "SECAM":
|
||||
lines = 242
|
||||
case "PAL":
|
||||
lines = 242
|
||||
case "PAL-60":
|
||||
lines = 192
|
||||
case "NTSC":
|
||||
lines = 192
|
||||
default:
|
||||
lines = 192
|
||||
}
|
||||
|
||||
val := (lines - rainbowHeight - rainbowHeight - titleHeight*2) / 2
|
||||
|
||||
cart.write8bit(addrTitleGap1+1, val)
|
||||
cart.write8bit(addrTitleGap2+1, val)
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue