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- /*
- * 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 "libavutil/version.h"
- #include "libavcodec/version_major.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;
- /**
- * 以AVStream->time_base单位表示的演示时间戳;
- * 解压缩的数据包将呈现给用户的时间。
- * 如果未存储在文件中,则可以为AV_NOPTS_VALUE。
- * pts必须大于或等于dts,因为在解压缩之前不能进行表示,除非希望查看十六进制转储。
- * 一些格式滥用术语dts和pts/cts来表示不同的含义。
- * 在将这些时间戳存储到AVPacket中之前,必须将其转换为真正的pts/dts。
- */
- int64_t pts;
- /**
- * 以AVStream->time_base单位表示的解压缩时间戳;
- * 数据包被解压缩的时间。
- * 如果未存储在文件中,则可以为AV_NOPTS_VALUE。
- */
- int64_t dts;
- uint8_t *data;
- int size;
- int stream_index;
- /**
- * AV_PKT_FLAG值的组合
- */
- 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; ///< 流中的字节位置,如果未知,则为-1
- /**
- * 用于用户的一些私人数据
- */
- 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;
- /**
- * 数据包时间戳的时基。
- * 将来,该字段可能会在编码器或解复用器输出的数据包上设置,但默认情况下,在输入到解码器或复用器时,其值将被忽略。
- */
- 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 ///< 数据包包含一个关键帧
- #define AV_PKT_FLAG_CORRUPT 0x0002 ///< 数据包内容已损坏
- /**
- * 标志用于丢弃保持有效解码器状态所需的数据包,但输出不需要这些数据包,解码后应丢弃这些数据包。
- **/
- #define AV_PKT_FLAG_DISCARD 0x0004
- /**
- * 数据包来自可信来源。
- *
- *否则不安全的构造,例如指向数据的任意指针
- *可以在包外跟踪。
- */
- #define AV_PKT_FLAG_TRUSTED 0x0008
- /**
- * 标志用于指示包含解码器可以丢弃的帧的数据包。I.e.非参考框架。
- * 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 {
- #if FF_API_OLD_CHANNEL_LAYOUT
- /**
- * @deprecated those are not used by any decoder
- */
- AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
- AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
- #endif
- AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
- AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
- };
- /**
- * 分配AVPacket并将其字段设置为默认值。必须使用av_packet_free()释放生成的结构。
- *
- * @return AVPacket填充了默认值或失败时为NULL。
- *
- * @note 这只分配AVPacket本身,而不是数据缓冲区。
- * 这些必须通过其他方式分配,如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);
- /**
- * 擦拭数据包。
- *
- * 取消引用数据包引用的缓冲区,并将其余数据包字段重置为其默认值。
- *
- * @param pkt 要取消引用的数据包。
- */
- 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
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