forked from asticode/go-astiav
/
packet.go
162 lines (129 loc) · 3.11 KB
/
packet.go
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package astiav
//#cgo pkg-config: libavcodec
//#include <libavcodec/avcodec.h>
import "C"
import (
"errors"
"unsafe"
)
// https://github.com/FFmpeg/FFmpeg/blob/n5.0/libavcodec/packet.h#L350
type Packet struct {
c *C.struct_AVPacket
}
func newPacketFromC(c *C.struct_AVPacket) *Packet {
if c == nil {
return nil
}
return &Packet{c: c}
}
func AllocPacket() *Packet {
return newPacketFromC(C.av_packet_alloc())
}
func (p *Packet) Data() []byte {
if p.c.data == nil {
return nil
}
return bytesFromC(func(size *cUlong) *C.uint8_t {
*size = cUlong(p.c.size)
return p.c.data
})
}
func (p *Packet) Dts() int64 {
return int64(p.c.dts)
}
func (p *Packet) SetDts(v int64) {
p.c.dts = C.int64_t(v)
}
func (p *Packet) Duration() int64 {
return int64(p.c.duration)
}
func (p *Packet) SetDuration(d int64) {
p.c.duration = C.int64_t(d)
}
func (p *Packet) Flags() PacketFlags {
return PacketFlags(p.c.flags)
}
func (p *Packet) SetFlags(f PacketFlags) {
p.c.flags = C.int(f)
}
func (p *Packet) Pos() int64 {
return int64(p.c.pos)
}
func (p *Packet) SetPos(v int64) {
p.c.pos = C.int64_t(v)
}
func (p *Packet) Pts() int64 {
return int64(p.c.pts)
}
func (p *Packet) SetPts(v int64) {
p.c.pts = C.int64_t(v)
}
func (p *Packet) AddSideData(t PacketSideDataType, data []byte) error {
// Create buf
buf := (*C.uint8_t)(C.av_malloc(C.size_t(len(data))))
if buf == nil {
return errors.New("astiav: allocating buffer failed")
}
C.memcpy(unsafe.Pointer(buf), unsafe.Pointer(&data[0]), C.size_t(len(data)))
// Add
return newError(C.av_packet_add_side_data(p.c, (C.enum_AVPacketSideDataType)(t), buf, C.size_t(len(data))))
}
func (p *Packet) SideData(t PacketSideDataType) []byte {
return bytesFromC(func(size *cUlong) *C.uint8_t {
return C.av_packet_get_side_data(p.c, (C.enum_AVPacketSideDataType)(t), size)
})
}
func (p *Packet) Size() int {
return int(p.c.size)
}
func (p *Packet) SetSize(s int) {
p.c.size = C.int(s)
}
func (p *Packet) StreamIndex() int {
return int(p.c.stream_index)
}
func (p *Packet) SetStreamIndex(i int) {
p.c.stream_index = C.int(i)
}
func (p *Packet) Free() {
C.av_packet_free(&p.c)
}
func (p *Packet) Clone() *Packet {
return newPacketFromC(C.av_packet_clone(p.c))
}
func (p *Packet) AllocPayload(s int) error {
return newError(C.av_new_packet(p.c, C.int(s)))
}
func (p *Packet) Ref(src *Packet) error {
return newError(C.av_packet_ref(p.c, src.c))
}
func (p *Packet) Unref() {
C.av_packet_unref(p.c)
}
func (p *Packet) MoveRef(src *Packet) {
C.av_packet_move_ref(p.c, src.c)
}
func (p *Packet) RescaleTs(src, dst Rational) {
C.av_packet_rescale_ts(p.c, src.c, dst.c)
}
func (p *Packet) FromData(data []byte) (err error) {
// Create buf
buf := (*C.uint8_t)(C.av_malloc(C.size_t(len(data))))
if buf == nil {
err = errors.New("astiav: allocating buffer failed")
return
}
// Make sure to free buf in case of error
defer func() {
if err != nil {
C.av_freep(unsafe.Pointer(&buf))
}
}()
// Copy
if len(data) > 0 {
C.memcpy(unsafe.Pointer(buf), unsafe.Pointer(&data[0]), C.size_t(len(data)))
}
// From data
err = newError(C.av_packet_from_data(p.c, buf, C.int(len(data))))
return
}