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data_types.go
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data_types.go
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package qtff
import (
"encoding"
"encoding/binary"
"fmt"
)
var dataTypes = map[FourCC]func() encoding.BinaryUnmarshaler{}
type MediaHeaderData struct {
TimeScale uint32
Duration uint32
}
func init() {
dataTypes[FourCCFromString("mdhd")] = func() encoding.BinaryUnmarshaler { return &MediaHeaderData{} }
}
func (d *MediaHeaderData) UnmarshalBinary(b []byte) error {
if len(b) < 24 {
return fmt.Errorf("data too short")
}
d.TimeScale = binary.BigEndian.Uint32(b[12:])
d.Duration = binary.BigEndian.Uint32(b[16:])
return nil
}
type HandlerReferenceData struct {
ComponentType FourCC
ComponentSubtype FourCC
}
func init() {
dataTypes[FourCCFromString("hdlr")] = func() encoding.BinaryUnmarshaler { return &HandlerReferenceData{} }
}
func (d *HandlerReferenceData) UnmarshalBinary(b []byte) error {
if len(b) < 24 {
return fmt.Errorf("data too short")
}
d.ComponentType = FourCC(binary.BigEndian.Uint32(b[4:]))
d.ComponentSubtype = FourCC(binary.BigEndian.Uint32(b[8:]))
return nil
}
type ChunkOffset64Data struct {
NumberOfEntries int
Offsets []uint64
}
func init() {
dataTypes[FourCCFromString("co64")] = func() encoding.BinaryUnmarshaler { return &ChunkOffset64Data{} }
}
func (d *ChunkOffset64Data) UnmarshalBinary(b []byte) error {
if len(b) < 8 {
return fmt.Errorf("data too short")
}
d.NumberOfEntries = int(binary.BigEndian.Uint32(b[4:]))
if len(b) < 8+d.NumberOfEntries*8 {
return fmt.Errorf("data too short for entries")
}
d.Offsets = make([]uint64, d.NumberOfEntries)
for i := 0; i < d.NumberOfEntries; i++ {
d.Offsets[i] = binary.BigEndian.Uint64(b[8+i*8:])
}
return nil
}
type ChunkOffsetData struct {
NumberOfEntries int
Offsets []uint32
}
func init() {
dataTypes[FourCCFromString("stco")] = func() encoding.BinaryUnmarshaler { return &ChunkOffsetData{} }
}
func (d *ChunkOffsetData) UnmarshalBinary(b []byte) error {
if len(b) < 8 {
return fmt.Errorf("data too short")
}
d.NumberOfEntries = int(binary.BigEndian.Uint32(b[4:]))
if len(b) < 8+d.NumberOfEntries*4 {
return fmt.Errorf("data too short for entries")
}
d.Offsets = make([]uint32, d.NumberOfEntries)
for i := 0; i < d.NumberOfEntries; i++ {
d.Offsets[i] = binary.BigEndian.Uint32(b[8+i*4:])
}
return nil
}
type SampleSizeData struct {
ConstantSampleSize int
NumberOfEntries int
SampleSizes []int
}
func init() {
dataTypes[FourCCFromString("stsz")] = func() encoding.BinaryUnmarshaler { return &SampleSizeData{} }
}
func (d *SampleSizeData) SampleSize(n int) int {
if d.ConstantSampleSize != 0 {
return d.ConstantSampleSize
}
return d.SampleSizes[n-1]
}
func (d *SampleSizeData) UnmarshalBinary(b []byte) error {
if len(b) < 12 {
return fmt.Errorf("data too short")
}
d.ConstantSampleSize = int(binary.BigEndian.Uint32(b[4:]))
if d.ConstantSampleSize == 0 {
d.NumberOfEntries = int(binary.BigEndian.Uint32(b[8:]))
if len(b) < 12+d.NumberOfEntries*4 {
return fmt.Errorf("data too short for entries")
}
d.SampleSizes = make([]int, d.NumberOfEntries)
for i := 0; i < d.NumberOfEntries; i++ {
d.SampleSizes[i] = int(binary.BigEndian.Uint32(b[12+i*4:]))
}
}
return nil
}
type SampleToChunkDataEntry struct {
FirstChunk int
SamplesPerChunk int
}
type SampleToChunkData struct {
NumberOfEntries int
Entries []SampleToChunkDataEntry
}
func init() {
dataTypes[FourCCFromString("stsc")] = func() encoding.BinaryUnmarshaler { return &SampleToChunkData{} }
}
func (d *SampleToChunkData) ChunkFirstSample(n int) int {
if len(d.Entries) == 1 {
return (n-1)*d.Entries[0].SamplesPerChunk + 1
}
sampleOffset := 0
for i := 1; i < len(d.Entries); i++ {
e := d.Entries[i]
prev := d.Entries[i-1]
if e.FirstChunk >= n {
return sampleOffset + (n-prev.FirstChunk)*prev.SamplesPerChunk + 1
}
sampleOffset += (e.FirstChunk - prev.FirstChunk) * prev.SamplesPerChunk
}
return sampleOffset + (n-d.Entries[len(d.Entries)-1].FirstChunk)*d.Entries[len(d.Entries)-1].SamplesPerChunk + 1
}
func (d *SampleToChunkData) SampleChunk(n int) int {
if len(d.Entries) == 1 {
return 1 + (n-1)/d.Entries[0].SamplesPerChunk
}
sampleOffset := 0
for i := 1; i < len(d.Entries); i++ {
e := d.Entries[i]
prev := d.Entries[i-1]
newSampleOffset := sampleOffset + (e.FirstChunk-prev.FirstChunk)*prev.SamplesPerChunk
if newSampleOffset >= n {
return prev.FirstChunk + (n-sampleOffset-1)/prev.SamplesPerChunk
}
sampleOffset = newSampleOffset
}
return d.Entries[len(d.Entries)-1].FirstChunk + (n-sampleOffset-1)/d.Entries[len(d.Entries)-1].SamplesPerChunk
}
func (d *SampleToChunkData) UnmarshalBinary(b []byte) error {
if len(b) < 8 {
return fmt.Errorf("data too short")
}
d.NumberOfEntries = int(binary.BigEndian.Uint32(b[4:]))
d.Entries = make([]SampleToChunkDataEntry, d.NumberOfEntries)
for i := range d.Entries {
d.Entries[i].FirstChunk = int(binary.BigEndian.Uint32(b[8+i*12:]))
d.Entries[i].SamplesPerChunk = int(binary.BigEndian.Uint32(b[8+i*12+4:]))
}
return nil
}