Types and functions for working with AVPacket. Подробнее...

Граф связей класса AVPacket:

Классы
struct	AVPacketSideData

struct	AVPacket

Определения типов
typedef struct AVPacketSideData	AVPacketSideData

typedef struct AVPacket	AVPacket

Перечисления
enum	AVPacketSideDataType { AV_PKT_DATA_PALETTE, AV_PKT_DATA_NEW_EXTRADATA, AV_PKT_DATA_PARAM_CHANGE, AV_PKT_DATA_H263_MB_INFO, AV_PKT_DATA_REPLAYGAIN, AV_PKT_DATA_DISPLAYMATRIX, AV_PKT_DATA_STEREO3D, AV_PKT_DATA_AUDIO_SERVICE_TYPE, AV_PKT_DATA_QUALITY_STATS, AV_PKT_DATA_FALLBACK_TRACK, AV_PKT_DATA_CPB_PROPERTIES, AV_PKT_DATA_SKIP_SAMPLES, AV_PKT_DATA_JP_DUALMONO, AV_PKT_DATA_STRINGS_METADATA, AV_PKT_DATA_SUBTITLE_POSITION, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, AV_PKT_DATA_WEBVTT_IDENTIFIER, AV_PKT_DATA_WEBVTT_SETTINGS, AV_PKT_DATA_METADATA_UPDATE, AV_PKT_DATA_MPEGTS_STREAM_ID, AV_PKT_DATA_MASTERING_DISPLAY_METADATA, AV_PKT_DATA_SPHERICAL, AV_PKT_DATA_CONTENT_LIGHT_LEVEL, AV_PKT_DATA_A53_CC, AV_PKT_DATA_ENCRYPTION_INIT_INFO, AV_PKT_DATA_ENCRYPTION_INFO, AV_PKT_DATA_AFD, AV_PKT_DATA_NB }

enum	AVSideDataParamChangeFlags { AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001, AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002, AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004, AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008 }

Функции
AVPacket *	av_packet_alloc (void)

AVPacket *	av_packet_clone (const AVPacket *src)

void	av_packet_free (AVPacket **pkt)

void	av_init_packet (AVPacket *pkt)

int	av_new_packet (AVPacket *pkt, int size)

void	av_shrink_packet (AVPacket *pkt, int size)

int	av_grow_packet (AVPacket *pkt, int grow_by)

int	av_packet_from_data (AVPacket pkt, uint8_t data, int size)

attribute_deprecated int	av_dup_packet (AVPacket *pkt)

attribute_deprecated int	av_copy_packet (AVPacket dst, const AVPacket src)

attribute_deprecated int	av_copy_packet_side_data (AVPacket dst, const AVPacket src)

attribute_deprecated void	av_free_packet (AVPacket *pkt)

uint8_t *	av_packet_new_side_data (AVPacket *pkt, enum AVPacketSideDataType type, int size)

int	av_packet_add_side_data (AVPacket pkt, enum AVPacketSideDataType type, uint8_t data, size_t size)

int	av_packet_shrink_side_data (AVPacket *pkt, enum AVPacketSideDataType type, int size)

uint8_t *	av_packet_get_side_data (const AVPacket pkt, enum AVPacketSideDataType type, int size)

attribute_deprecated int	av_packet_merge_side_data (AVPacket *pkt)

attribute_deprecated int	av_packet_split_side_data (AVPacket *pkt)

const char *	av_packet_side_data_name (enum AVPacketSideDataType type)

uint8_t *	av_packet_pack_dictionary (AVDictionary dict, int size)

int	av_packet_unpack_dictionary (const uint8_t data, int size, AVDictionary *dict)

void	av_packet_free_side_data (AVPacket *pkt)

int	av_packet_ref (AVPacket dst, const AVPacket src)

void	av_packet_unref (AVPacket *pkt)

void	av_packet_move_ref (AVPacket dst, AVPacket src)

int	av_packet_copy_props (AVPacket dst, const AVPacket src)

int	av_packet_make_refcounted (AVPacket *pkt)

int	av_packet_make_writable (AVPacket *pkt)

void	av_packet_rescale_ts (AVPacket *pkt, AVRational tb_src, AVRational tb_dst)

Подробное описание

Types and functions for working with AVPacket.

Типы

◆ AVPacketSideData

typedef struct AVPacketSideData AVPacketSideData

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

◆ AVPacket

typedef struct AVPacket AVPacket

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

This structure stores compressed data. It is typically exported by demuxers and then passed as input to decoders, or received as output from encoders and then passed to muxers.

For video, it should typically contain one compressed frame. For audio it may contain several compressed frames. Encoders are allowed to output empty packets, with no compressed data, containing only side data (e.g. to update some stream parameters at the end of encoding).

AVPacket is one of the few structs in FFmpeg, whose size is a part of public ABI. Thus it may be allocated on stack and no new fields can be added to it without libavcodec and libavformat major bump.

The semantics of data ownership depends on the buf field. If it is set, the packet data is dynamically allocated and is valid indefinitely until a call to av_packet_unref() reduces the reference count to 0.

If the buf field is not set av_packet_ref() would make a copy instead of increasing the reference count.

The side data is always allocated with av_malloc(), copied by av_packet_ref() and freed by av_packet_unref().

См. также: av_packet_ref; av_packet_unref

Перечисления

◆ AVPacketSideDataType

enum AVPacketSideDataType

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Элементы перечислений
AV_PKT_DATA_PALETTE	An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette. This side data signals that a new palette is present.
AV_PKT_DATA_NEW_EXTRADATA	The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was changed and the receiving side should act upon it appropriately. The new extradata is embedded in the side data buffer and should be immediately used for processing the current frame or packet.
AV_PKT_DATA_PARAM_CHANGE	An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows: u32le param_flags if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) s32le channel_count if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) u64le channel_layout if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) s32le sample_rate if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) s32le width s32le height
AV_PKT_DATA_H263_MB_INFO	An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of structures with info about macroblocks relevant to splitting the packet into smaller packets on macroblock edges (e.g. as for RFC 2190). That is, it does not necessarily contain info about all macroblocks, as long as the distance between macroblocks in the info is smaller than the target payload size. Each MB info structure is 12 bytes, and is laid out as follows: u32le bit offset from the start of the packet u8 current quantizer at the start of the macroblock u8 GOB number u16le macroblock address within the GOB u8 horizontal MV predictor u8 vertical MV predictor u8 horizontal MV predictor for block number 3 u8 vertical MV predictor for block number 3
AV_PKT_DATA_REPLAYGAIN	This side data should be associated with an audio stream and contains ReplayGain information in form of the AVReplayGain struct.
AV_PKT_DATA_DISPLAYMATRIX	This side data contains a 3x3 transformation matrix describing an affine transformation that needs to be applied to the decoded video frames for correct presentation. See libavutil/display.h for a detailed description of the data.
AV_PKT_DATA_STEREO3D	This side data should be associated with a video stream and contains Stereoscopic 3D information in form of the AVStereo3D struct.
AV_PKT_DATA_AUDIO_SERVICE_TYPE	This side data should be associated with an audio stream and corresponds to enum AVAudioServiceType.
AV_PKT_DATA_QUALITY_STATS	This side data contains quality related information from the encoder. u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad). u8 picture type u8 error count u16 reserved u64le[error count] sum of squared differences between encoder in and output
AV_PKT_DATA_FALLBACK_TRACK	This side data contains an integer value representing the stream index of a "fallback" track. A fallback track indicates an alternate track to use when the current track can not be decoded for some reason. e.g. no decoder available for codec.
AV_PKT_DATA_CPB_PROPERTIES	This side data corresponds to the AVCPBProperties struct.
AV_PKT_DATA_SKIP_SAMPLES	Recommmends skipping the specified number of samples u32le number of samples to skip from start of this packet u32le number of samples to skip from end of this packet u8 reason for start skip u8 reason for end skip (0=padding silence, 1=convergence)
AV_PKT_DATA_JP_DUALMONO	An AV_PKT_DATA_JP_DUALMONO side data packet indicates that the packet may contain "dual mono" audio specific to Japanese DTV and if it is true, recommends only the selected channel to be used. u8 selected channels (0=mail/left, 1=sub/right, 2=both)
AV_PKT_DATA_STRINGS_METADATA	A list of zero terminated key/value strings. There is no end marker for the list, so it is required to rely on the side data size to stop.
AV_PKT_DATA_SUBTITLE_POSITION	Subtitle event position u32le x1 u32le y1 u32le x2 u32le y2
AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL	Data found in BlockAdditional element of matroska container. There is no end marker for the data, so it is required to rely on the side data size to recognize the end. 8 byte id (as found in BlockAddId) followed by data.
AV_PKT_DATA_WEBVTT_IDENTIFIER	The optional first identifier line of a WebVTT cue.
AV_PKT_DATA_WEBVTT_SETTINGS	The optional settings (rendering instructions) that immediately follow the timestamp specifier of a WebVTT cue.
AV_PKT_DATA_METADATA_UPDATE	A list of zero terminated key/value strings. There is no end marker for the list, so it is required to rely on the side data size to stop. This side data includes updated metadata which appeared in the stream.
AV_PKT_DATA_MPEGTS_STREAM_ID	MPEGTS stream ID as uint8_t, this is required to pass the stream ID information from the demuxer to the corresponding muxer.
AV_PKT_DATA_MASTERING_DISPLAY_METADATA	Mastering display metadata (based on SMPTE-2086:2014). This metadata should be associated with a video stream and contains data in the form of the AVMasteringDisplayMetadata struct.
AV_PKT_DATA_SPHERICAL	This side data should be associated with a video stream and corresponds to the AVSphericalMapping structure.
AV_PKT_DATA_CONTENT_LIGHT_LEVEL	Content light level (based on CTA-861.3). This metadata should be associated with a video stream and contains data in the form of the AVContentLightMetadata struct.
AV_PKT_DATA_A53_CC	ATSC A53 Part 4 Closed Captions. This metadata should be associated with a video stream. A53 CC bitstream is stored as uint8_t in AVPacketSideData.data. The number of bytes of CC data is AVPacketSideData.size.
AV_PKT_DATA_ENCRYPTION_INIT_INFO	This side data is encryption initialization data. The format is not part of ABI, use av_encryption_init_info_* methods to access.
AV_PKT_DATA_ENCRYPTION_INFO	This side data contains encryption info for how to decrypt the packet. The format is not part of ABI, use av_encryption_info_* methods to access.
AV_PKT_DATA_AFD	Active Format Description data consisting of a single byte as specified in ETSI TS 101 154 using AVActiveFormatDescription enum.
AV_PKT_DATA_NB	The number of side data types. This is not part of the public API/ABI in the sense that it may change when new side data types are added. This must stay the last enum value. If its value becomes huge, some code using it needs to be updated as it assumes it to be smaller than other limits.

См. определение в файле avcodec.h строка 1184

                           {
     AV_PKT_DATA_PALETTE,
  
     AV_PKT_DATA_NEW_EXTRADATA,
  
     AV_PKT_DATA_PARAM_CHANGE,
  
     AV_PKT_DATA_H263_MB_INFO,
  
     AV_PKT_DATA_REPLAYGAIN,
  
     AV_PKT_DATA_DISPLAYMATRIX,
  
     AV_PKT_DATA_STEREO3D,
  
     AV_PKT_DATA_AUDIO_SERVICE_TYPE,
  
     AV_PKT_DATA_QUALITY_STATS,
  
     AV_PKT_DATA_FALLBACK_TRACK,
  
     AV_PKT_DATA_CPB_PROPERTIES,
  
     AV_PKT_DATA_SKIP_SAMPLES,
  
     AV_PKT_DATA_JP_DUALMONO,
  
     AV_PKT_DATA_STRINGS_METADATA,
  
     AV_PKT_DATA_SUBTITLE_POSITION,
  
     AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
  
     AV_PKT_DATA_WEBVTT_IDENTIFIER,
  
     AV_PKT_DATA_WEBVTT_SETTINGS,
  
     AV_PKT_DATA_METADATA_UPDATE,
  
     AV_PKT_DATA_MPEGTS_STREAM_ID,
  
     AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
  
     AV_PKT_DATA_SPHERICAL,
  
     AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
  
     AV_PKT_DATA_A53_CC,
  
     AV_PKT_DATA_ENCRYPTION_INIT_INFO,
  
     AV_PKT_DATA_ENCRYPTION_INFO,
  
     AV_PKT_DATA_AFD,
  
     AV_PKT_DATA_NB
 };

◆ AVSideDataParamChangeFlags

enum AVSideDataParamChangeFlags

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Элементы перечислений
AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT
AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT
AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE
AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS

См. определение в файле avcodec.h строка 1531

                                 {
     AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT  = 0x0001,
     AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
     AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE    = 0x0004,
     AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS     = 0x0008,
 };

Функции

◆ av_packet_alloc()

AVPacket* av_packet_alloc ( void )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Allocate an AVPacket and set its fields to default values. The resulting struct must be freed using av_packet_free().

Возвращает: An AVPacket filled with default values or NULL on failure.

Заметки: this only allocates the AVPacket itself, not the data buffers. Those must be allocated through other means such as av_new_packet.

См. также: av_new_packet

Используется в Movie::GetFrame() и AudioBaseDataSource::GetNextBuffer().

Граф вызова функции:

◆ av_packet_clone()

AVPacket* av_packet_clone ( const AVPacket * src )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Create a new packet that references the same data as src.

This is a shortcut for av_packet_alloc()+av_packet_ref().

Возвращает: newly created AVPacket on success, NULL on error.

См. также: av_packet_alloc; av_packet_ref

◆ av_packet_free()

void av_packet_free ( AVPacket ** pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Free the packet, if the packet is reference counted, it will be unreferenced first.

Аргументы

pkt	packet to be freed. The pointer will be set to NULL.

Заметки: passing NULL is a no-op.

Используется в Movie::GetFrame() и AudioBaseDataSource::GetNextBuffer().

Граф вызова функции:

◆ av_init_packet()

void av_init_packet ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Initialize optional fields of a packet with default values.

Note, this does not touch the data and size members, which have to be initialized separately.

Аргументы

pkt packet

◆ av_new_packet()

int av_new_packet	(	AVPacket *	pkt,
		int	size
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Allocate the payload of a packet and initialize its fields with default values.

Аргументы

pkt	packet
size	wanted payload size

Возвращает: 0 if OK, AVERROR_xxx otherwise

◆ av_shrink_packet()

void av_shrink_packet	(	AVPacket *	pkt,
		int	size
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Reduce packet size, correctly zeroing padding

Аргументы

pkt	packet
size	new size

◆ av_grow_packet()

int av_grow_packet	(	AVPacket *	pkt,
		int	grow_by
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Increase packet size, correctly zeroing padding

Аргументы

pkt	packet
grow_by	number of bytes by which to increase the size of the packet

◆ av_packet_from_data()

int av_packet_from_data	(	AVPacket *	pkt,
		uint8_t *	data,
		int	size
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Initialize a reference-counted packet from av_malloc()ed data.

Аргументы

pkt	packet to be initialized. This function will set the data, size, and buf fields, all others are left untouched.
data	Data allocated by av_malloc() to be used as packet data. If this function returns successfully, the data is owned by the underlying AVBuffer. The caller may not access the data through other means.
size	size of data in bytes, without the padding. I.e. the full buffer size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.

Возвращает: 0 on success, a negative AVERROR on error

◆ av_dup_packet()

attribute_deprecated int av_dup_packet ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Предупреждения: This is a hack - the packet memory allocation stuff is broken. The packet is allocated if it was not really allocated.

Уст.:: Use av_packet_ref or av_packet_make_refcounted

◆ av_copy_packet()

attribute_deprecated int av_copy_packet	(	AVPacket *	dst,
		const AVPacket *	src
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Copy packet, including contents

Возвращает: 0 on success, negative AVERROR on fail

Уст.:: Use av_packet_ref

◆ av_copy_packet_side_data()

attribute_deprecated int av_copy_packet_side_data	(	AVPacket *	dst,
		const AVPacket *	src
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Copy packet side data

Возвращает: 0 on success, negative AVERROR on fail

Уст.:: Use av_packet_copy_props

◆ av_free_packet()

attribute_deprecated void av_free_packet ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Free a packet.

Уст.:: Use av_packet_unref

Аргументы

pkt	packet to free

◆ av_packet_new_side_data()

uint8_t* av_packet_new_side_data	(	AVPacket *	pkt,
		enum AVPacketSideDataType	type,
		int	size
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Allocate new information of a packet.

Аргументы

pkt	packet
type	side information type
size	side information size

Возвращает: pointer to fresh allocated data or NULL otherwise

◆ av_packet_add_side_data()

int av_packet_add_side_data	(	AVPacket *	pkt,
		enum AVPacketSideDataType	type,
		uint8_t *	data,
		size_t	size
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Wrap an existing array as a packet side data.

Аргументы

pkt	packet
type	side information type
data	the side data array. It must be allocated with the av_malloc() family of functions. The ownership of the data is transferred to pkt.
size	side information size

Возвращает: a non-negative number on success, a negative AVERROR code on failure. On failure, the packet is unchanged and the data remains owned by the caller.

◆ av_packet_shrink_side_data()

int av_packet_shrink_side_data	(	AVPacket *	pkt,
		enum AVPacketSideDataType	type,
		int	size
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Shrink the already allocated side data buffer

Аргументы

pkt	packet
type	side information type
size	new side information size

Возвращает: 0 on success, < 0 on failure

◆ av_packet_get_side_data()

uint8_t* av_packet_get_side_data	(	const AVPacket *	pkt,
		enum AVPacketSideDataType	type,
		int *	size
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Get side information from packet.

Аргументы

pkt	packet
type	desired side information type
size	pointer for side information size to store (optional)

Возвращает: pointer to data if present or NULL otherwise

◆ av_packet_merge_side_data()

attribute_deprecated int av_packet_merge_side_data ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

◆ av_packet_split_side_data()

attribute_deprecated int av_packet_split_side_data ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

◆ av_packet_side_data_name()

const char* av_packet_side_data_name ( enum AVPacketSideDataType type )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

◆ av_packet_pack_dictionary()

uint8_t* av_packet_pack_dictionary	(	AVDictionary *	dict,
		int *	size
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Pack a dictionary for use in side_data.

Аргументы

dict	The dictionary to pack.
size	pointer to store the size of the returned data

Возвращает: pointer to data if successful, NULL otherwise

◆ av_packet_unpack_dictionary()

int av_packet_unpack_dictionary	(	const uint8_t *	data,
		int	size,
		AVDictionary **	dict
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Unpack a dictionary from side_data.

Аргументы

data	data from side_data
size	size of the data
dict	the metadata storage dictionary

Возвращает: 0 on success, < 0 on failure

◆ av_packet_free_side_data()

void av_packet_free_side_data ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Convenience function to free all the side data stored. All the other fields stay untouched.

Аргументы

pkt packet

◆ av_packet_ref()

int av_packet_ref	(	AVPacket *	dst,
		const AVPacket *	src
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Setup a new reference to the data described by a given packet

If src is reference-counted, setup dst as a new reference to the buffer in src. Otherwise allocate a new buffer in dst and copy the data from src into it.

All the other fields are copied from src.

См. также: av_packet_unref

Аргументы

dst	Destination packet
src	Source packet

Возвращает: 0 on success, a negative AVERROR on error.

◆ av_packet_unref()

void av_packet_unref ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Wipe the packet.

Unreference the buffer referenced by the packet and reset the remaining packet fields to their default values.

Аргументы

pkt	The packet to be unreferenced.

◆ av_packet_move_ref()

void av_packet_move_ref	(	AVPacket *	dst,
		AVPacket *	src
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Move every field in src to dst and reset src.

См. также: av_packet_unref

Аргументы

src	Source packet, will be reset
dst	Destination packet

◆ av_packet_copy_props()

int av_packet_copy_props	(	AVPacket *	dst,
		const AVPacket *	src
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Copy only "properties" fields from src to dst.

Properties for the purpose of this function are all the fields beside those related to the packet data (buf, data, size)

Аргументы

dst	Destination packet
src	Source packet

Возвращает: 0 on success AVERROR on failure.

◆ av_packet_make_refcounted()

int av_packet_make_refcounted ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Ensure the data described by a given packet is reference counted.

Заметки: This function does not ensure that the reference will be writable. Use av_packet_make_writable instead for that purpose.

См. также: av_packet_ref; av_packet_make_writable

Аргументы

pkt	packet whose data should be made reference counted.

Возвращает: 0 on success, a negative AVERROR on error. On failure, the packet is unchanged.

◆ av_packet_make_writable()

int av_packet_make_writable ( AVPacket * pkt )

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Create a writable reference for the data described by a given packet, avoiding data copy if possible.

Аргументы

pkt	Packet whose data should be made writable.

Возвращает: 0 on success, a negative AVERROR on failure. On failure, the packet is unchanged.

◆ av_packet_rescale_ts()

void av_packet_rescale_ts	(	AVPacket *	pkt,
		AVRational	tb_src,
		AVRational	tb_dst
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Convert valid timing fields (timestamps / durations) in a packet from one timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be ignored.

Аргументы

pkt	packet on which the conversion will be performed
tb_src	source timebase, in which the timing fields in pkt are expressed
tb_dst	destination timebase, to which the timing fields will be converted

Классы

Определения типов

Перечисления

Функции

Подробное описание

Типы

◆ AVPacketSideData

◆ AVPacket

Перечисления

◆ AVPacketSideDataType

◆ AVSideDataParamChangeFlags

Функции

◆ av_packet_alloc()

◆ av_packet_clone()

◆ av_packet_free()

◆ av_init_packet()

◆ av_new_packet()

◆ av_shrink_packet()

◆ av_grow_packet()

◆ av_packet_from_data()

◆ av_dup_packet()

◆ av_copy_packet()

◆ av_copy_packet_side_data()

◆ av_free_packet()

◆ av_packet_new_side_data()

◆ av_packet_add_side_data()

◆ av_packet_shrink_side_data()

◆ av_packet_get_side_data()

◆ av_packet_merge_side_data()

◆ av_packet_split_side_data()

◆ av_packet_side_data_name()

◆ av_packet_pack_dictionary()

◆ av_packet_unpack_dictionary()

◆ av_packet_free_side_data()

◆ av_packet_ref()

◆ av_packet_unref()

◆ av_packet_move_ref()

◆ av_packet_copy_props()

◆ av_packet_make_refcounted()

◆ av_packet_make_writable()

◆ av_packet_rescale_ts()