StormByte::Multimedia::FFmpeg::AVDecoder Class Reference

RAII decoder context with optional BSF pipeline. More...

#include <StormByte/multimedia/ffmpeg/AVDecoder.hxx>

Inheritance diagram for StormByte::Multimedia::FFmpeg::AVDecoder:

Collaboration diagram for StormByte::Multimedia::FFmpeg::AVDecoder:

Public Member Functions
	AVDecoder (const AVDecoder &)=delete
	Copy constructor (deleted).
	AVDecoder (AVDecoder &&other) noexcept=default
	Move constructor.
	~AVDecoder () noexcept override
	Destructor.
AVDecoder &	operator= (const AVDecoder &)=delete
	Copy assignment (deleted).
AVDecoder &	operator= (AVDecoder &&other) noexcept=default
	Move assignment.
FFmpeg::OperationResult	SendPacket (AVPacket &pkt) noexcept
	Sends a packet (after BSF) to the decoder.
FFmpeg::OperationResult	ReceiveFrame (AVFrame &frame) noexcept
	Receives a decoded frame.
int	StreamIndex () const noexcept
	Stream index this decoder was opened for.
AVRational	TimeBase () const noexcept
	Time base used for decoded frame timestamps.
void	Flush () noexcept
	Flushes decoder and BSF buffers (does not signal EOF).
FFmpeg::OperationResult	SetEof () noexcept
	Signals EOF (avcodec_send_packet(nullptr) + BSF EOF).
bool	IsSubtitle () const noexcept
	true if the opened codec is a subtitle decoder.
OperationResult	DecodeSubtitle (AVPacket &pkt, FFmpeg::AVSubtitle &out) noexcept
	Decodes one subtitle packet (avcodec_decode_subtitle2).
Public Member Functions inherited from StormByte::Multimedia::FFmpeg::AVPointer<::AVCodecContext >
constexpr	AVPointer () noexcept=delete
	Default constructor (deleted).
virtual	~AVPointer () noexcept=default
	Destructor.
constexpr AVPointer &	operator= (const AVPointer &) noexcept=delete
	Copy assignment (deleted).

Static Public Member Functions
static ExpectedAVDecoder	Open (AVCodec *codec, const AVCodecParameters &params, const AVFormatContext &fmt, int stream_index) noexcept
	Opens a decoder from codec and parameters; may attach mp4→Annex-B BSF.
static ExpectedAVDecoder	Open (AVCodec *codec, const AVCodecParameters &params, int stream_index) noexcept
	Opens a decoder from codec and parameters.

Additional Inherited Members
Protected Member Functions inherited from StormByte::Multimedia::FFmpeg::AVPointer<::AVCodecContext >
constexpr const std::decay_t< ::AVCodecContext > *	Get () const noexcept
	Const view of the raw FFmpeg pointer.
constexpr std::decay_t< ::AVCodecContext > *	Detach () noexcept
	Yields the raw pointer and leaves this wrapper empty.
Protected Attributes inherited from StormByte::Multimedia::FFmpeg::AVPointer<::AVCodecContext >
std::decay_t< ::AVCodecContext > *	m_ptr
	Owned FFmpeg pointer.

Detailed Description

RAII decoder context with optional BSF pipeline.

Constructor & Destructor Documentation

AVDecoder() [1/2]

StormByte::Multimedia::FFmpeg::AVDecoder::AVDecoder ( const AVDecoder & )

delete

Copy constructor (deleted).

AVDecoder() [2/2]

StormByte::Multimedia::FFmpeg::AVDecoder::AVDecoder ( AVDecoder && other )

defaultnoexcept

Move constructor.

Parameters

other

Source decoder.

~AVDecoder()

StormByte::Multimedia::FFmpeg::AVDecoder::~AVDecoder ( )

overridenoexcept

Destructor.

Member Function Documentation

DecodeSubtitle()

OperationResult StormByte::Multimedia::FFmpeg::AVDecoder::DecodeSubtitle ( AVPacket & pkt, FFmpeg::AVSubtitle & out )

noexcept

Decodes one subtitle packet (avcodec_decode_subtitle2).

Parameters

pkt	Compressed packet.
out	Filled when a subtitle is produced.

Returns

Success, TryAgain (no subtitle this packet), EndOfFile or Error.

Flush()

void StormByte::Multimedia::FFmpeg::AVDecoder::Flush ( )

noexcept

Flushes decoder and BSF buffers (does not signal EOF).

IsSubtitle()

bool StormByte::Multimedia::FFmpeg::AVDecoder::IsSubtitle ( ) const

noexcept

true if the opened codec is a subtitle decoder.

Returns

true for subtitle codecs.

Open() [1/2]

ExpectedAVDecoder StormByte::Multimedia::FFmpeg::AVDecoder::Open ( AVCodec * codec, const AVCodecParameters & params, const AVFormatContext & fmt, int stream_index )

staticnoexcept

Opens a decoder from codec and parameters; may attach mp4→Annex-B BSF.

Parameters

codec	Decoder codec.
params	Stream codec parameters.
fmt	Parent format context (for BSF decision).
stream_index	Stream index this decoder serves.

Returns

Decoder or DecoderError.

Open() [2/2]

ExpectedAVDecoder StormByte::Multimedia::FFmpeg::AVDecoder::Open ( AVCodec * codec, const AVCodecParameters & params, int stream_index )

staticnoexcept

Opens a decoder from codec and parameters.

No BSF.

Parameters

codec	Decoder codec.
params	Stream codec parameters.
stream_index	Stream index this decoder serves (must match AVPacket::StreamIndex on SendPacket).

Returns

Decoder or DecoderError.

For Analytics encode-look: packets already left the Encoder, so mp4→Annex-B is not applied. Use the four-argument Open when the parent format is known.

operator=() [1/2]

AVDecoder & StormByte::Multimedia::FFmpeg::AVDecoder::operator= ( AVDecoder && other )

defaultnoexcept

Move assignment.

Parameters

other

Source decoder.

Returns

*this.

operator=() [2/2]

AVDecoder & StormByte::Multimedia::FFmpeg::AVDecoder::operator= ( const AVDecoder & )

delete

Copy assignment (deleted).

Returns

*this.

ReceiveFrame()

FFmpeg::OperationResult StormByte::Multimedia::FFmpeg::AVDecoder::ReceiveFrame ( AVFrame & frame )

noexcept

Receives a decoded frame.

Parameters

frame

Destination frame.

Returns

Operation result.

SendPacket()

FFmpeg::OperationResult StormByte::Multimedia::FFmpeg::AVDecoder::SendPacket ( AVPacket & pkt )

noexcept

Sends a packet (after BSF) to the decoder.

Parameters

pkt	Packet for this stream.

Returns

Operation result.

SetEof()

FFmpeg::OperationResult StormByte::Multimedia::FFmpeg::AVDecoder::SetEof ( )

noexcept

Signals EOF (avcodec_send_packet(nullptr) + BSF EOF).

Returns

Success/EndOfFile when the null packet was accepted, TryAgain if frames must be drained first.

StreamIndex()

int StormByte::Multimedia::FFmpeg::AVDecoder::StreamIndex ( ) const

noexcept

Stream index this decoder was opened for.

Returns

Stream index.

TimeBase()

AVRational StormByte::Multimedia::FFmpeg::AVDecoder::TimeBase ( ) const

noexcept

Time base used for decoded frame timestamps.

Returns

pkt_timebase if set, otherwise time_base.

---

The documentation for this class was generated from the following file:

• lib/public/StormByte/multimedia/ffmpeg/AVDecoder.hxx