mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-04 07:21:31 +02:00
![Lynne](/assets/img/avatar_default.png)
This commit adds a long-requested by API users opaque fields for AVPacket, as well as a time_base field.
723 lines
23 KiB
C
723 lines
23 KiB
C
/*
|
|
* AVPacket public API
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_PACKET_H
|
|
#define AVCODEC_PACKET_H
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/buffer.h"
|
|
#include "libavutil/dict.h"
|
|
#include "libavutil/rational.h"
|
|
|
|
#include "libavcodec/version.h"
|
|
|
|
/**
|
|
* @defgroup lavc_packet AVPacket
|
|
*
|
|
* Types and functions for working with AVPacket.
|
|
* @{
|
|
*/
|
|
enum AVPacketSideDataType {
|
|
/**
|
|
* 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_PALETTE,
|
|
|
|
/**
|
|
* 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_NEW_EXTRADATA,
|
|
|
|
/**
|
|
* An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
|
|
* @code
|
|
* 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
|
|
* @endcode
|
|
*/
|
|
AV_PKT_DATA_PARAM_CHANGE,
|
|
|
|
/**
|
|
* 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:
|
|
* @code
|
|
* 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
|
|
* @endcode
|
|
*/
|
|
AV_PKT_DATA_H263_MB_INFO,
|
|
|
|
/**
|
|
* This side data should be associated with an audio stream and contains
|
|
* ReplayGain information in form of the AVReplayGain struct.
|
|
*/
|
|
AV_PKT_DATA_REPLAYGAIN,
|
|
|
|
/**
|
|
* 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_DISPLAYMATRIX,
|
|
|
|
/**
|
|
* This side data should be associated with a video stream and contains
|
|
* Stereoscopic 3D information in form of the AVStereo3D struct.
|
|
*/
|
|
AV_PKT_DATA_STEREO3D,
|
|
|
|
/**
|
|
* This side data should be associated with an audio stream and corresponds
|
|
* to enum AVAudioServiceType.
|
|
*/
|
|
AV_PKT_DATA_AUDIO_SERVICE_TYPE,
|
|
|
|
/**
|
|
* This side data contains quality related information from the encoder.
|
|
* @code
|
|
* 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
|
|
* @endcode
|
|
*/
|
|
AV_PKT_DATA_QUALITY_STATS,
|
|
|
|
/**
|
|
* 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_FALLBACK_TRACK,
|
|
|
|
/**
|
|
* This side data corresponds to the AVCPBProperties struct.
|
|
*/
|
|
AV_PKT_DATA_CPB_PROPERTIES,
|
|
|
|
/**
|
|
* Recommmends skipping the specified number of samples
|
|
* @code
|
|
* 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)
|
|
* @endcode
|
|
*/
|
|
AV_PKT_DATA_SKIP_SAMPLES,
|
|
|
|
/**
|
|
* 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.
|
|
* @code
|
|
* u8 selected channels (0=mail/left, 1=sub/right, 2=both)
|
|
* @endcode
|
|
*/
|
|
AV_PKT_DATA_JP_DUALMONO,
|
|
|
|
/**
|
|
* 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_STRINGS_METADATA,
|
|
|
|
/**
|
|
* Subtitle event position
|
|
* @code
|
|
* u32le x1
|
|
* u32le y1
|
|
* u32le x2
|
|
* u32le y2
|
|
* @endcode
|
|
*/
|
|
AV_PKT_DATA_SUBTITLE_POSITION,
|
|
|
|
/**
|
|
* 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_MATROSKA_BLOCKADDITIONAL,
|
|
|
|
/**
|
|
* The optional first identifier line of a WebVTT cue.
|
|
*/
|
|
AV_PKT_DATA_WEBVTT_IDENTIFIER,
|
|
|
|
/**
|
|
* The optional settings (rendering instructions) that immediately
|
|
* follow the timestamp specifier of a WebVTT cue.
|
|
*/
|
|
AV_PKT_DATA_WEBVTT_SETTINGS,
|
|
|
|
/**
|
|
* 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_METADATA_UPDATE,
|
|
|
|
/**
|
|
* 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_MPEGTS_STREAM_ID,
|
|
|
|
/**
|
|
* 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_MASTERING_DISPLAY_METADATA,
|
|
|
|
/**
|
|
* This side data should be associated with a video stream and corresponds
|
|
* to the AVSphericalMapping structure.
|
|
*/
|
|
AV_PKT_DATA_SPHERICAL,
|
|
|
|
/**
|
|
* 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_CONTENT_LIGHT_LEVEL,
|
|
|
|
/**
|
|
* 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_A53_CC,
|
|
|
|
/**
|
|
* 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_INIT_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_ENCRYPTION_INFO,
|
|
|
|
/**
|
|
* Active Format Description data consisting of a single byte as specified
|
|
* in ETSI TS 101 154 using AVActiveFormatDescription enum.
|
|
*/
|
|
AV_PKT_DATA_AFD,
|
|
|
|
/**
|
|
* Producer Reference Time data corresponding to the AVProducerReferenceTime struct,
|
|
* usually exported by some encoders (on demand through the prft flag set in the
|
|
* AVCodecContext export_side_data field).
|
|
*/
|
|
AV_PKT_DATA_PRFT,
|
|
|
|
/**
|
|
* ICC profile data consisting of an opaque octet buffer following the
|
|
* format described by ISO 15076-1.
|
|
*/
|
|
AV_PKT_DATA_ICC_PROFILE,
|
|
|
|
/**
|
|
* DOVI configuration
|
|
* ref:
|
|
* dolby-vision-bitstreams-within-the-iso-base-media-file-format-v2.1.2, section 2.2
|
|
* dolby-vision-bitstreams-in-mpeg-2-transport-stream-multiplex-v1.2, section 3.3
|
|
* Tags are stored in struct AVDOVIDecoderConfigurationRecord.
|
|
*/
|
|
AV_PKT_DATA_DOVI_CONF,
|
|
|
|
/**
|
|
* Timecode which conforms to SMPTE ST 12-1:2014. The data is an array of 4 uint32_t
|
|
* where the first uint32_t describes how many (1-3) of the other timecodes are used.
|
|
* The timecode format is described in the documentation of av_timecode_get_smpte_from_framenum()
|
|
* function in libavutil/timecode.h.
|
|
*/
|
|
AV_PKT_DATA_S12M_TIMECODE,
|
|
|
|
/**
|
|
* HDR10+ dynamic metadata associated with a video frame. The metadata is in
|
|
* the form of the AVDynamicHDRPlus struct and contains
|
|
* information for color volume transform - application 4 of
|
|
* SMPTE 2094-40:2016 standard.
|
|
*/
|
|
AV_PKT_DATA_DYNAMIC_HDR10_PLUS,
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
AV_PKT_DATA_NB
|
|
};
|
|
|
|
#define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
|
|
|
|
typedef struct AVPacketSideData {
|
|
uint8_t *data;
|
|
size_t size;
|
|
enum AVPacketSideDataType type;
|
|
} AVPacketSideData;
|
|
|
|
/**
|
|
* 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).
|
|
*
|
|
* 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().
|
|
*
|
|
* sizeof(AVPacket) being a part of the public ABI is deprecated. once
|
|
* av_init_packet() is removed, new packets will only be able to be allocated
|
|
* with av_packet_alloc(), and new fields may be added to the end of the struct
|
|
* with a minor bump.
|
|
*
|
|
* @see av_packet_alloc
|
|
* @see av_packet_ref
|
|
* @see av_packet_unref
|
|
*/
|
|
typedef struct AVPacket {
|
|
/**
|
|
* A reference to the reference-counted buffer where the packet data is
|
|
* stored.
|
|
* May be NULL, then the packet data is not reference-counted.
|
|
*/
|
|
AVBufferRef *buf;
|
|
/**
|
|
* Presentation timestamp in AVStream->time_base units; the time at which
|
|
* the decompressed packet will be presented to the user.
|
|
* Can be AV_NOPTS_VALUE if it is not stored in the file.
|
|
* pts MUST be larger or equal to dts as presentation cannot happen before
|
|
* decompression, unless one wants to view hex dumps. Some formats misuse
|
|
* the terms dts and pts/cts to mean something different. Such timestamps
|
|
* must be converted to true pts/dts before they are stored in AVPacket.
|
|
*/
|
|
int64_t pts;
|
|
/**
|
|
* Decompression timestamp in AVStream->time_base units; the time at which
|
|
* the packet is decompressed.
|
|
* Can be AV_NOPTS_VALUE if it is not stored in the file.
|
|
*/
|
|
int64_t dts;
|
|
uint8_t *data;
|
|
int size;
|
|
int stream_index;
|
|
/**
|
|
* A combination of AV_PKT_FLAG values
|
|
*/
|
|
int flags;
|
|
/**
|
|
* Additional packet data that can be provided by the container.
|
|
* Packet can contain several types of side information.
|
|
*/
|
|
AVPacketSideData *side_data;
|
|
int side_data_elems;
|
|
|
|
/**
|
|
* Duration of this packet in AVStream->time_base units, 0 if unknown.
|
|
* Equals next_pts - this_pts in presentation order.
|
|
*/
|
|
int64_t duration;
|
|
|
|
int64_t pos; ///< byte position in stream, -1 if unknown
|
|
|
|
/**
|
|
* for some private data of the user
|
|
*/
|
|
void *opaque;
|
|
|
|
/**
|
|
* AVBufferRef for free use by the API user. FFmpeg will never check the
|
|
* contents of the buffer ref. FFmpeg calls av_buffer_unref() on it when
|
|
* the packet is unreferenced. av_packet_copy_props() calls create a new
|
|
* reference with av_buffer_ref() for the target packet's opaque_ref field.
|
|
*
|
|
* This is unrelated to the opaque field, although it serves a similar
|
|
* purpose.
|
|
*/
|
|
AVBufferRef *opaque_ref;
|
|
|
|
/**
|
|
* Time base of the packet's timestamps.
|
|
*/
|
|
AVRational time_base;
|
|
} AVPacket;
|
|
|
|
#if FF_API_INIT_PACKET
|
|
attribute_deprecated
|
|
typedef struct AVPacketList {
|
|
AVPacket pkt;
|
|
struct AVPacketList *next;
|
|
} AVPacketList;
|
|
#endif
|
|
|
|
#define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
|
|
#define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
|
|
/**
|
|
* Flag is used to discard packets which are required to maintain valid
|
|
* decoder state but are not required for output and should be dropped
|
|
* after decoding.
|
|
**/
|
|
#define AV_PKT_FLAG_DISCARD 0x0004
|
|
/**
|
|
* The packet comes from a trusted source.
|
|
*
|
|
* Otherwise-unsafe constructs such as arbitrary pointers to data
|
|
* outside the packet may be followed.
|
|
*/
|
|
#define AV_PKT_FLAG_TRUSTED 0x0008
|
|
/**
|
|
* Flag is used to indicate packets that contain frames that can
|
|
* be discarded by the decoder. I.e. Non-reference frames.
|
|
*/
|
|
#define AV_PKT_FLAG_DISPOSABLE 0x0010
|
|
|
|
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,
|
|
};
|
|
|
|
/**
|
|
* Allocate an AVPacket and set its fields to default values. The resulting
|
|
* struct must be freed using av_packet_free().
|
|
*
|
|
* @return An AVPacket filled with default values or NULL on failure.
|
|
*
|
|
* @note this only allocates the AVPacket itself, not the data buffers. Those
|
|
* must be allocated through other means such as av_new_packet.
|
|
*
|
|
* @see av_new_packet
|
|
*/
|
|
AVPacket *av_packet_alloc(void);
|
|
|
|
/**
|
|
* Create a new packet that references the same data as src.
|
|
*
|
|
* This is a shortcut for av_packet_alloc()+av_packet_ref().
|
|
*
|
|
* @return newly created AVPacket on success, NULL on error.
|
|
*
|
|
* @see av_packet_alloc
|
|
* @see av_packet_ref
|
|
*/
|
|
AVPacket *av_packet_clone(const AVPacket *src);
|
|
|
|
/**
|
|
* Free the packet, if the packet is reference counted, it will be
|
|
* unreferenced first.
|
|
*
|
|
* @param pkt packet to be freed. The pointer will be set to NULL.
|
|
* @note passing NULL is a no-op.
|
|
*/
|
|
void av_packet_free(AVPacket **pkt);
|
|
|
|
#if FF_API_INIT_PACKET
|
|
/**
|
|
* 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.
|
|
*
|
|
* @param pkt packet
|
|
*
|
|
* @see av_packet_alloc
|
|
* @see av_packet_unref
|
|
*
|
|
* @deprecated This function is deprecated. Once it's removed,
|
|
sizeof(AVPacket) will not be a part of the ABI anymore.
|
|
*/
|
|
attribute_deprecated
|
|
void av_init_packet(AVPacket *pkt);
|
|
#endif
|
|
|
|
/**
|
|
* Allocate the payload of a packet and initialize its fields with
|
|
* default values.
|
|
*
|
|
* @param pkt packet
|
|
* @param size wanted payload size
|
|
* @return 0 if OK, AVERROR_xxx otherwise
|
|
*/
|
|
int av_new_packet(AVPacket *pkt, int size);
|
|
|
|
/**
|
|
* Reduce packet size, correctly zeroing padding
|
|
*
|
|
* @param pkt packet
|
|
* @param size new size
|
|
*/
|
|
void av_shrink_packet(AVPacket *pkt, int size);
|
|
|
|
/**
|
|
* Increase packet size, correctly zeroing padding
|
|
*
|
|
* @param pkt packet
|
|
* @param grow_by number of bytes by which to increase the size of the packet
|
|
*/
|
|
int av_grow_packet(AVPacket *pkt, int grow_by);
|
|
|
|
/**
|
|
* Initialize a reference-counted packet from av_malloc()ed data.
|
|
*
|
|
* @param pkt packet to be initialized. This function will set the data, size,
|
|
* and buf fields, all others are left untouched.
|
|
* @param 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.
|
|
* @param 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.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on error
|
|
*/
|
|
int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
|
|
|
|
/**
|
|
* Allocate new information of a packet.
|
|
*
|
|
* @param pkt packet
|
|
* @param type side information type
|
|
* @param size side information size
|
|
* @return pointer to fresh allocated data or NULL otherwise
|
|
*/
|
|
uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
|
|
size_t size);
|
|
|
|
/**
|
|
* Wrap an existing array as a packet side data.
|
|
*
|
|
* @param pkt packet
|
|
* @param type side information type
|
|
* @param 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.
|
|
* @param size side information size
|
|
* @return 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.
|
|
*/
|
|
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
|
|
uint8_t *data, size_t size);
|
|
|
|
/**
|
|
* Shrink the already allocated side data buffer
|
|
*
|
|
* @param pkt packet
|
|
* @param type side information type
|
|
* @param size new side information size
|
|
* @return 0 on success, < 0 on failure
|
|
*/
|
|
int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
|
|
size_t size);
|
|
|
|
/**
|
|
* Get side information from packet.
|
|
*
|
|
* @param pkt packet
|
|
* @param type desired side information type
|
|
* @param size If supplied, *size will be set to the size of the side data
|
|
* or to zero if the desired side data is not present.
|
|
* @return pointer to data if present or NULL otherwise
|
|
*/
|
|
uint8_t* av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
|
|
size_t *size);
|
|
|
|
const char *av_packet_side_data_name(enum AVPacketSideDataType type);
|
|
|
|
/**
|
|
* Pack a dictionary for use in side_data.
|
|
*
|
|
* @param dict The dictionary to pack.
|
|
* @param size pointer to store the size of the returned data
|
|
* @return pointer to data if successful, NULL otherwise
|
|
*/
|
|
uint8_t *av_packet_pack_dictionary(AVDictionary *dict, size_t *size);
|
|
/**
|
|
* Unpack a dictionary from side_data.
|
|
*
|
|
* @param data data from side_data
|
|
* @param size size of the data
|
|
* @param dict the metadata storage dictionary
|
|
* @return 0 on success, < 0 on failure
|
|
*/
|
|
int av_packet_unpack_dictionary(const uint8_t *data, size_t size,
|
|
AVDictionary **dict);
|
|
|
|
/**
|
|
* Convenience function to free all the side data stored.
|
|
* All the other fields stay untouched.
|
|
*
|
|
* @param pkt packet
|
|
*/
|
|
void av_packet_free_side_data(AVPacket *pkt);
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @see av_packet_unref
|
|
*
|
|
* @param dst Destination packet. Will be completely overwritten.
|
|
* @param src Source packet
|
|
*
|
|
* @return 0 on success, a negative AVERROR on error. On error, dst
|
|
* will be blank (as if returned by av_packet_alloc()).
|
|
*/
|
|
int av_packet_ref(AVPacket *dst, const AVPacket *src);
|
|
|
|
/**
|
|
* Wipe the packet.
|
|
*
|
|
* Unreference the buffer referenced by the packet and reset the
|
|
* remaining packet fields to their default values.
|
|
*
|
|
* @param pkt The packet to be unreferenced.
|
|
*/
|
|
void av_packet_unref(AVPacket *pkt);
|
|
|
|
/**
|
|
* Move every field in src to dst and reset src.
|
|
*
|
|
* @see av_packet_unref
|
|
*
|
|
* @param src Source packet, will be reset
|
|
* @param dst Destination packet
|
|
*/
|
|
void av_packet_move_ref(AVPacket *dst, AVPacket *src);
|
|
|
|
/**
|
|
* 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)
|
|
*
|
|
* @param dst Destination packet
|
|
* @param src Source packet
|
|
*
|
|
* @return 0 on success AVERROR on failure.
|
|
*/
|
|
int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
|
|
|
|
/**
|
|
* Ensure the data described by a given packet is reference counted.
|
|
*
|
|
* @note This function does not ensure that the reference will be writable.
|
|
* Use av_packet_make_writable instead for that purpose.
|
|
*
|
|
* @see av_packet_ref
|
|
* @see av_packet_make_writable
|
|
*
|
|
* @param pkt packet whose data should be made reference counted.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on error. On failure, the
|
|
* packet is unchanged.
|
|
*/
|
|
int av_packet_make_refcounted(AVPacket *pkt);
|
|
|
|
/**
|
|
* Create a writable reference for the data described by a given packet,
|
|
* avoiding data copy if possible.
|
|
*
|
|
* @param pkt Packet whose data should be made writable.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on failure. On failure, the
|
|
* packet is unchanged.
|
|
*/
|
|
int av_packet_make_writable(AVPacket *pkt);
|
|
|
|
/**
|
|
* Convert valid timing fields (timestamps / durations) in a packet from one
|
|
* timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
|
|
* ignored.
|
|
*
|
|
* @param pkt packet on which the conversion will be performed
|
|
* @param tb_src source timebase, in which the timing fields in pkt are
|
|
* expressed
|
|
* @param tb_dst destination timebase, to which the timing fields will be
|
|
* converted
|
|
*/
|
|
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif // AVCODEC_PACKET_H
|