AvFormatDecoder Class Reference

A decoder for video files. More...

#include <avformatdecoder.h>

Inheritance diagram for AvFormatDecoder:

Public Member Functions
	AvFormatDecoder (MythPlayer *parent, const ProgramInfo &pginfo, PlayerFlags flags)
	~AvFormatDecoder ()
virtual void	SetEof (bool eof)
void	CloseCodecs ()
void	CloseContext ()
virtual void	Reset (bool reset_video_data, bool seek_reset, bool reset_file)
int	OpenFile (RingBuffer *rbuffer, bool novideo, char testbuf[kDecoderProbeBufferSize], int testbufsize=kDecoderProbeBufferSize)
	Open our file and set up or audio and video parameters.
virtual bool	GetFrame (DecodeType)
	Demux, preprocess and possibly decode a frame of video/audio.
virtual bool	IsLastFrameKey (void) const
virtual bool	IsCodecMPEG (void) const
void	WriteStoredData (RingBuffer *rb, bool storevid, long timecodeOffset)
	This is a No-op for this class.
void	SetRawAudioState (bool state)
	This is a No-op for this class.
bool	GetRawAudioState (void) const
	This is a No-op for this class.
void	SetRawVideoState (bool state)
	This is a No-op for this class.
bool	GetRawVideoState (void) const
	This is a No-op for this class.
long	UpdateStoredFrameNum (long frame)
	This is a No-op for this class.
QString	GetCodecDecoderName (void) const
QString	GetRawEncodingType (void)
MythCodecID	GetVideoCodecID (void) const
void *	GetVideoCodecPrivate (void)
virtual void	SetDisablePassThrough (bool disable)
	Disables AC3/DTS pass through.
void	AddTextData (unsigned char *buf, int len, int64_t timecode, char type)
virtual QString	GetTrackDesc (uint type, uint trackNo) const
virtual int	SetTrack (uint type, int trackNo)
int	ScanStreams (bool novideo)
int	FindStreamInfo (void)
virtual int	GetNumChapters ()
virtual void	GetChapterTimes (QList< long long > &times)
virtual int	GetCurrentChapter (long long framesPlayed)
virtual long long	GetChapter (int chapter)
virtual bool	DoRewind (long long desiredFrame, bool doflush=true)
virtual bool	DoFastForward (long long desiredFrame, bool doflush=true)
	Skips ahead or rewinds to desiredFrame.
virtual int64_t	NormalizeVideoTimecode (int64_t timecode)
virtual int64_t	NormalizeVideoTimecode (AVStream *st, int64_t timecode)
virtual int	GetTeletextDecoderType (void) const
virtual QString	GetXDS (const QString &) const
virtual QByteArray	GetSubHeader (uint trackNo) const
virtual void	GetAttachmentData (uint trackNo, QByteArray &filename, QByteArray &data)
virtual bool	SetAudioByComponentTag (int tag)
virtual bool	SetVideoByComponentTag (int tag)
virtual int	GetSubtitleLanguage (uint subtitle_index, uint stream_index)
	Returns DVD Subtitle language.
virtual int	GetCaptionLanguage (TrackTypes trackType, int service_num)
	Return ATSC Closed Caption Language.
virtual int	GetAudioLanguage (uint audio_index, uint stream_index)
Static Public Member Functions
static void	GetDecoders (render_opts &opts)
static bool	CanHandle (char testbuf[kDecoderProbeBufferSize], const QString &filename, int testbufsize=kDecoderProbeBufferSize)
	Perform an av_probe_input_format on the passed data to see if we can decode it with this class.
Protected Member Functions
RingBuffer *	getRingBuf (void)
virtual int	AutoSelectTrack (uint type)
	Select best track.
void	ScanATSCCaptionStreams (int av_stream_index)
void	UpdateATSCCaptionTracks (void)
void	UpdateCaptionTracksFromStreams (bool check_608, bool check_708)
void	ScanTeletextCaptions (int av_stream_index)
void	ScanRawTextCaptions (int av_stream_index)
void	ScanDSMCCStreams (void)
	Check to see whether there is a Network Boot Ifo sub-descriptor in the PMT which requires the MHEG application to reboot.
int	AutoSelectAudioTrack (void)
	Selects the best audio track.
int	filter_max_ch (const AVFormatContext *ic, const sinfo_vec_t &tracks, const vector< int > &fs, enum CodecID codecId=CODEC_ID_NONE, int profile=-1)
void	DecodeDTVCC (const uint8_t *buf, uint buf_size, bool scte)
void	InitByteContext (void)
void	InitVideoCodec (AVStream stream, AVCodecContext enc, bool selectedStream=false)
void	MpegPreProcessPkt (AVStream stream, AVPacket pkt)
	Preprocess a packet, setting the video parms if necessary.
bool	H264PreProcessPkt (AVStream stream, AVPacket pkt)
bool	PreProcessVideoPacket (AVStream stream, AVPacket pkt)
bool	ProcessVideoPacket (AVStream stream, AVPacket pkt)
bool	ProcessVideoFrame (AVStream stream, AVFrame mpa_pic)
bool	ProcessAudioPacket (AVStream stream, AVPacket pkt, DecodeType decodetype)
bool	ProcessSubtitlePacket (AVStream stream, AVPacket pkt)
bool	ProcessRawTextPacket (AVPacket *pkt)
bool	ProcessDataPacket (AVStream curstream, AVPacket pkt, DecodeType decodetype)
void	ProcessVBIDataPacket (const AVStream stream, const AVPacket pkt)
	Process ivtv proprietary embedded vertical blanking interval captions.
void	ProcessDVBDataPacket (const AVStream stream, const AVPacket pkt)
	Process DVB Teletext.
void	ProcessDSMCCPacket (const AVStream stream, const AVPacket pkt)
	Process DSMCC object carousel packet.
float	GetMpegAspect (AVCodecContext *context, int aspect_ratio_info, int width, int height)
void	SeekReset (long long, uint skipFrames, bool doFlush, bool discardFrames)
bool	DecoderWillDownmix (const AVCodecContext *ctx)
bool	DoPassThrough (const AVCodecContext *ctx, bool withProfile=true)
bool	SetupAudioStream (void)
	Reinitializes audio if it needs to be reinitialized.
void	SetupAudioStreamSubIndexes (int streamIndex)
	Reacts to DUAL/STEREO changes on the fly and fix streams.
void	RemoveAudioStreams ()
	remove audio streams from the context used by dvd code during title transitions to remove stale audio streams
void	HandleGopStart (AVPacket *pkt, bool can_reliably_parse_keyframes)
	Update our position map, keyframe distance, and the like.
bool	GenerateDummyVideoFrames (void)
bool	HasVideo (const AVFormatContext *ic)
float	normalized_fps (AVStream stream, AVCodecContext enc)
void	av_update_stream_timings_video (AVFormatContext *ic)
virtual void	UpdateFramesPlayed (void)
virtual bool	DoRewindSeek (long long desiredFrame)
virtual void	DoFastForwardSeek (long long desiredFrame, bool &needflush)
	Seeks to the keyframe just before the desiredFrame if exact seeks is enabled, or the frame just after it if exact seeks is not enabled.
virtual void	StreamChangeCheck (void)
virtual void	PostProcessTracks (void)
int	DecodeAudio (AVCodecContext ctx, uint8_t buffer, int &data_size, AVPacket *pkt)
Protected Attributes
PrivateDecoder *	private_dec
bool	is_db_ignored
H264Parser *	m_h264_parser
AVFormatContext *	ic
URLContext	readcontext
int	frame_decoded
VideoFrame *	decoded_video_frame
AVFRingBuffer *	avfRingBuffer
struct SwsContext *	sws_ctx
bool	directrendering
bool	no_dts_hack
bool	dorewind
bool	gopset
bool	seen_gop
	A flag to indicate that we've seen a GOP frame. Used in junction with seq_count.
int	seq_count
	A counter used to determine if we need to force a call to HandleGopStart.
QList< AVPacket * >	storedPackets
int	prevgoppos
bool	gotVideoFrame
bool	hasVideo
bool	needDummyVideoFrames
bool	skipaudio
bool	allowedquit
uint32_t	start_code_state
long long	lastvpts
long long	lastapts
long long	lastccptsu
long long	firstvpts
bool	firstvptsinuse
int64_t	faulty_pts
int64_t	faulty_dts
int64_t	last_pts_for_fault_detection
int64_t	last_dts_for_fault_detection
bool	pts_detected
bool	reordered_pts_detected
bool	pts_selected
bool	force_dts_timestamps
PlayerFlags	playerFlags
MythCodecID	video_codec_id
int	maxkeyframedist
bool	ignore_scte
uint	invert_scte_field
uint	last_scte_field
CC608Decoder *	ccd608
CC708Decoder *	ccd708
TeletextDecoder *	ttd
int	cc608_parity_table [256]
bool	ccX08_in_pmt [64+4]
	Lookup table for whether a stream was seen in the PMT entries 0-3 correspond to CEA-608 CC1 through CC4, while entries 4-67 corresport to CEA-708 streams 0 through 64.
bool	ccX08_in_tracks [64+4]
	Lookup table for whether a stream is represented in the UI entries 0-3 correspond to CEA-608 CC1 through CC4, while entries 4-67 corresport to CEA-708 streams 0 through 64.
QList< StreamInfo >	pmt_tracks
	StreamInfo for 608 and 708 Captions seen in the PMT descriptor.
QList< TrackType >	pmt_track_types
	TrackType (608 or 708) for Captions seen in the PMT descriptor.
QList< StreamInfo >	stream_tracks
	StreamInfo for 608 and 708 Captions seen in the caption stream itself but not seen in the PMT.
QList< TrackType >	stream_track_types
	TrackType (608 or 708) for Captions seen in the caption stream itself but not seen in the PMT.
InteractiveTV *	itv
	MHEG/MHP decoder.
uint8_t *	audioSamples
bool	disable_passthru
AudioInfo	audioIn
AudioInfo	audioOut
float	m_fps
bool	codec_is_mpeg
Friends
void	HandleStreamChange (void *)
void	HandleDVDStreamChange (void *)
void	HandleBDStreamChange (void *)
int	get_avf_buffer (struct AVCodecContext c, AVFrame pic)
void	release_avf_buffer (struct AVCodecContext c, AVFrame pic)
int	open_avf (URLContext h, const char filename, int flags)
int	read_avf (URLContext h, uint8_t buf, int buf_size)
int	write_avf (URLContext h, uint8_t buf, int buf_size)
int64_t	seek_avf (URLContext *h, int64_t offset, int whence)
int	close_avf (URLContext *h)

Detailed Description

A decoder for video files.

The AvFormatDecoder is used to decode non-NuppleVideo files. It's used as a decoder of last resort after trying the NuppelDecoder

Definition at line 89 of file avformatdecoder.h.

Constructor & Destructor Documentation

AvFormatDecoder::AvFormatDecoder	(	MythPlayer *	parent,
		const ProgramInfo &	pginfo,
		PlayerFlags	flags
	)

Definition at line 265 of file avformatdecoder.cpp.

AvFormatDecoder::~AvFormatDecoder ( )

Definition at line 331 of file avformatdecoder.cpp.

Member Function Documentation

void AvFormatDecoder::GetDecoders ( render_opts & opts ) [static]

Definition at line 242 of file avformatdecoder.cpp.

void AvFormatDecoder::SetEof ( bool eof ) [virtual]

Reimplemented from DecoderBase.

Definition at line 747 of file avformatdecoder.cpp.

Referenced by GetFrame().

void AvFormatDecoder::CloseCodecs ( )

Definition at line 364 of file avformatdecoder.cpp.

Referenced by CloseContext(), and HandleBDStreamChange().

void AvFormatDecoder::CloseContext ( )

Definition at line 378 of file avformatdecoder.cpp.

Referenced by OpenFile(), and ~AvFormatDecoder().

void AvFormatDecoder::Reset	(	bool	reset_video_data,
		bool	seek_reset,
		bool	reset_file
	)			`[virtual]`

Reimplemented from DecoderBase.

Reimplemented in AvFormatDecoderBD, and AvFormatDecoderDVD.

Definition at line 759 of file avformatdecoder.cpp.

Referenced by HandleBDStreamChange().

bool AvFormatDecoder::CanHandle	(	char	testbuf[kDecoderProbeBufferSize],
		const QString &	filename,
		int	testbufsize = `kDecoderProbeBufferSize`
	)			`[static]`

Perform an av_probe_input_format on the passed data to see if we can decode it with this class.

Definition at line 778 of file avformatdecoder.cpp.

Referenced by MythPlayer::CreateDecoder(), MythDVDPlayer::CreateDecoder(), and MythBDPlayer::CreateDecoder().

int AvFormatDecoder::OpenFile	(	RingBuffer *	rbuffer,
		bool	novideo,
		char	testbuf[kDecoderProbeBufferSize],
		int	testbufsize = `kDecoderProbeBufferSize`
	)			`[virtual]`

Open our file and set up or audio and video parameters.

OpenFile opens a ringbuffer for playback.

OpenFile deletes any existing context then use testbuf to guess at the stream type. It then calls ScanStreams to find any valid streams to decode. If possible a position map is also built for quick skipping.

Parameters:

	rbuffer	pointer to a valid ringuffer.
	novideo	if true then no video is sought in ScanSreams.
	testbuf	this parameter is not used by AvFormatDecoder.

Implements DecoderBase.

Definition at line 899 of file avformatdecoder.cpp.

bool AvFormatDecoder::GetFrame ( DecodeType ) [virtual]

Demux, preprocess and possibly decode a frame of video/audio.

Implements DecoderBase.

Definition at line 4289 of file avformatdecoder.cpp.

Referenced by SeekReset().

virtual bool AvFormatDecoder::IsLastFrameKey ( void ) const [inline, virtual]

Implements DecoderBase.

Definition at line 119 of file avformatdecoder.h.

virtual bool AvFormatDecoder::IsCodecMPEG ( void ) const [inline, virtual]

Reimplemented from DecoderBase.

Definition at line 121 of file avformatdecoder.h.

void AvFormatDecoder::WriteStoredData	(	RingBuffer *	rb,
		bool	storevid,
		long	timecodeOffset
	)			`[inline, virtual]`