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/*
* Copyright (c) 2013 Functional Streams for Scala
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// Adapted from scodec-protocols, licensed under 3-clause BSD
package fs2.protocols.mpeg
import scodec.bits._
import scodec.{Attempt, DecodeResult, Decoder, Err}
trait PesPacket
object PesPacket {
case class WithHeader(streamId: Int, header: PesPacketHeader, data: BitVector) extends PesPacket
case class WithoutHeader(streamId: Int, data: BitVector) extends PesPacket
case object Padding extends PesPacket
def decode(prefix: PesPacketHeaderPrefix, buffer: BitVector): Attempt[DecodeResult[PesPacket]] =
decoder(prefix).decode(buffer)
def decoder(prefix: PesPacketHeaderPrefix): Decoder[PesPacket] = Decoder { buffer =>
val id = prefix.streamId
import PesStreamId._
if (
id != ProgramStreamMap &&
id != PaddingStream &&
id != PrivateStream2 &&
id != ECM &&
id != EMM &&
id != ProgramStreamDirectory &&
id != DSMCC &&
id != `ITU-T Rec. H.222.1 type E`
) {
PesPacketHeader.codec.decode(buffer) match {
case Attempt.Successful(DecodeResult(header, rest)) =>
decodeWithHeader(prefix, header, rest)
case f @ Attempt.Failure(_) => f
}
} else if (
id == ProgramStreamMap ||
id == PrivateStream2 ||
id == ECM ||
id == EMM |
id == ProgramStreamDirectory ||
id == DSMCC ||
id == `ITU-T Rec. H.222.1 type E`
) {
Attempt.successful(DecodeResult(WithoutHeader(id, buffer), BitVector.empty))
} else if (id == PaddingStream) {
Attempt.successful(DecodeResult(Padding, BitVector.empty))
} else {
Attempt.failure(Err(s"Unknown PES stream id: $id"))
}
}
def decodeWithHeader(
prefix: PesPacketHeaderPrefix,
header: PesPacketHeader,
data: BitVector
): Attempt[DecodeResult[PesPacket]] =
Attempt.successful(DecodeResult(WithHeader(prefix.streamId, header, data), BitVector.empty))
}
