FFmpeg  2.4.3
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
Data Fields
AVFrame Struct Reference

This structure describes decoded (raw) audio or video data. More...

#include <frame.h>

Data Fields

uint8_t * data [AV_NUM_DATA_POINTERS]
 pointer to the picture/channel planes. More...
 
int linesize [AV_NUM_DATA_POINTERS]
 For video, size in bytes of each picture line. More...
 
uint8_t ** extended_data
 pointers to the data planes/channels. More...
 
int width
 width and height of the video frame More...
 
int height
 
int nb_samples
 number of audio samples (per channel) described by this frame More...
 
int format
 format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames, enum AVSampleFormat for audio) More...
 
int key_frame
 1 -> keyframe, 0-> not More...
 
enum AVPictureType pict_type
 Picture type of the frame. More...
 
AVRational sample_aspect_ratio
 Sample aspect ratio for the video frame, 0/1 if unknown/unspecified. More...
 
int64_t pts
 Presentation timestamp in time_base units (time when frame should be shown to user). More...
 
int64_t pkt_pts
 PTS copied from the AVPacket that was decoded to produce this frame. More...
 
int64_t pkt_dts
 DTS copied from the AVPacket that triggered returning this frame. More...
 
int coded_picture_number
 picture number in bitstream order More...
 
int display_picture_number
 picture number in display order More...
 
int quality
 quality (between 1 (good) and FF_LAMBDA_MAX (bad)) More...
 
void * opaque
 for some private data of the user More...
 
uint64_t error [AV_NUM_DATA_POINTERS]
 error More...
 
int repeat_pict
 When decoding, this signals how much the picture must be delayed. More...
 
int interlaced_frame
 The content of the picture is interlaced. More...
 
int top_field_first
 If the content is interlaced, is top field displayed first. More...
 
int palette_has_changed
 Tell user application that palette has changed from previous frame. More...
 
int64_t reordered_opaque
 reordered opaque 64bit (generally an integer or a double precision float PTS but can be anything). More...
 
int sample_rate
 Sample rate of the audio data. More...
 
uint64_t channel_layout
 Channel layout of the audio data. More...
 
AVBufferRefbuf [AV_NUM_DATA_POINTERS]
 AVBuffer references backing the data for this frame. More...
 
AVBufferRef ** extended_buf
 For planar audio which requires more than AV_NUM_DATA_POINTERS AVBufferRef pointers, this array will hold all the references which cannot fit into AVFrame.buf. More...
 
int nb_extended_buf
 Number of elements in extended_buf. More...
 
AVFrameSideData ** side_data
 
int nb_side_data
 
int flags
 Frame flags, a combination of AV_FRAME_FLAGS. More...
 
enum AVColorRange color_range
 MPEG vs JPEG YUV range. More...
 
enum AVColorPrimaries color_primaries
 
enum AVColorTransferCharacteristic color_trc
 
enum AVColorSpace colorspace
 YUV colorspace type. More...
 
enum AVChromaLocation chroma_location
 
int64_t best_effort_timestamp
 frame timestamp estimated using various heuristics, in stream time base Code outside libavcodec should access this field using: av_frame_get_best_effort_timestamp(frame) More...
 
int64_t pkt_pos
 reordered pos from the last AVPacket that has been input into the decoder Code outside libavcodec should access this field using: av_frame_get_pkt_pos(frame) More...
 
int64_t pkt_duration
 duration of the corresponding packet, expressed in AVStream->time_base units, 0 if unknown. More...
 
AVDictionarymetadata
 metadata. More...
 
int decode_error_flags
 decode error flags of the frame, set to a combination of FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there were errors during the decoding. More...
 
int channels
 number of audio channels, only used for audio. More...
 
int pkt_size
 size of the corresponding packet containing the compressed frame. More...
 
AVBufferRefqp_table_buf
 Not to be accessed directly from outside libavutil. More...
 

Detailed Description

This structure describes decoded (raw) audio or video data.

AVFrame must be allocated using av_frame_alloc(). Note that this only allocates the AVFrame itself, the buffers for the data must be managed through other means (see below). AVFrame must be freed with av_frame_free().

AVFrame is typically allocated once and then reused multiple times to hold different data (e.g. a single AVFrame to hold frames received from a decoder). In such a case, av_frame_unref() will free any references held by the frame and reset it to its original clean state before it is reused again.

The data described by an AVFrame is usually reference counted through the AVBuffer API. The underlying buffer references are stored in AVFrame.buf / AVFrame.extended_buf. An AVFrame is considered to be reference counted if at least one reference is set, i.e. if AVFrame.buf[0] != NULL. In such a case, every single data plane must be contained in one of the buffers in AVFrame.buf or AVFrame.extended_buf. There may be a single buffer for all the data, or one separate buffer for each plane, or anything in between.

sizeof(AVFrame) is not a part of the public ABI, so new fields may be added to the end with a minor bump. Similarly fields that are marked as to be only accessed by av_opt_ptr() can be reordered. This allows 2 forks to add fields without breaking compatibility with each other.

Examples:
decoding_encoding.c, demuxing_decoding.c, filter_audio.c, filtering_audio.c, filtering_video.c, muxing.c, transcode_aac.c, and transcoding.c.

Definition at line 145 of file frame.h.

Field Documentation

uint8_t* AVFrame::data[AV_NUM_DATA_POINTERS]

pointer to the picture/channel planes.

This might be different from the first allocated byte

Some decoders access areas outside 0,0 - width,height, please see avcodec_align_dimensions2(). Some filters and swscale can read up to 16 bytes beyond the planes, if these filters are to be used, then 16 extra bytes must be allocated.

Examples:
decoding_encoding.c, demuxing_decoding.c, filtering_audio.c, filtering_video.c, muxing.c, and transcode_aac.c.

Definition at line 156 of file frame.h.

Referenced by audio_decode_example(), decode_packet(), decode_write_frame(), display_frame(), fill_yuv_image(), get_audio_frame(), load_encode_and_write(), print_frame(), video_encode_example(), and write_audio_frame().

int AVFrame::linesize[AV_NUM_DATA_POINTERS]

For video, size in bytes of each picture line.

For audio, size in bytes of each plane.

For audio, only linesize[0] may be set. For planar audio, each channel plane must be the same size.

For video the linesizes should be multiples of the CPUs alignment preference, this is 16 or 32 for modern desktop CPUs. Some code requires such alignment other code can be slower without correct alignment, for yet other it makes no difference.

Note
The linesize may be larger than the size of usable data – there may be extra padding present for performance reasons.
Examples:
decoding_encoding.c, demuxing_decoding.c, filtering_video.c, and muxing.c.

Definition at line 173 of file frame.h.

Referenced by decode_packet(), decode_write_frame(), display_frame(), fill_yuv_image(), and video_encode_example().

uint8_t** AVFrame::extended_data

pointers to the data planes/channels.

For video, this should simply point to data[].

For planar audio, each channel has a separate data pointer, and linesize[0] contains the size of each channel buffer. For packed audio, there is just one data pointer, and linesize[0] contains the total size of the buffer for all channels.

Note: Both data and extended_data should always be set in a valid frame, but for planar audio with more channels that can fit in data, extended_data must be used in order to access all channels.

Examples:
demuxing_decoding.c, filter_audio.c, and transcode_aac.c.

Definition at line 189 of file frame.h.

Referenced by decode_packet(), get_input(), process_output(), and read_decode_convert_and_store().

int AVFrame::width

width and height of the video frame

Examples:
decoding_encoding.c, filtering_video.c, and muxing.c.

Definition at line 194 of file frame.h.

Referenced by alloc_picture(), display_frame(), and video_encode_example().

int AVFrame::height
Examples:
decoding_encoding.c, filtering_video.c, and muxing.c.

Definition at line 194 of file frame.h.

Referenced by alloc_picture(), display_frame(), and video_encode_example().

int AVFrame::nb_samples
int AVFrame::format

format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames, enum AVSampleFormat for audio)

Examples:
decoding_encoding.c, demuxing_decoding.c, filter_audio.c, and muxing.c.

Definition at line 206 of file frame.h.

Referenced by alloc_audio_frame(), alloc_picture(), audio_encode_example(), decode_packet(), get_input(), process_output(), and video_encode_example().

int AVFrame::key_frame

1 -> keyframe, 0-> not

Definition at line 211 of file frame.h.

enum AVPictureType AVFrame::pict_type

Picture type of the frame.

Examples:
transcoding.c.

Definition at line 216 of file frame.h.

Referenced by filter_encode_write_frame().

AVRational AVFrame::sample_aspect_ratio

Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.

Definition at line 226 of file frame.h.

int64_t AVFrame::pts

Presentation timestamp in time_base units (time when frame should be shown to user).

Examples:
decoding_encoding.c, demuxing_decoding.c, filter_audio.c, filtering_video.c, muxing.c, and transcoding.c.

Definition at line 231 of file frame.h.

Referenced by decode_packet(), display_frame(), get_input(), main(), video_encode_example(), write_audio_frame(), and write_video_frame().

int64_t AVFrame::pkt_pts

PTS copied from the AVPacket that was decoded to produce this frame.

Definition at line 236 of file frame.h.

int64_t AVFrame::pkt_dts

DTS copied from the AVPacket that triggered returning this frame.

(if frame threading isn't used) This is also the Presentation time of this AVFrame calculated from only AVPacket.dts values without pts values.

Definition at line 243 of file frame.h.

int AVFrame::coded_picture_number

picture number in bitstream order

Examples:
demuxing_decoding.c.

Definition at line 248 of file frame.h.

Referenced by decode_packet().

int AVFrame::display_picture_number

picture number in display order

Definition at line 252 of file frame.h.

int AVFrame::quality

quality (between 1 (good) and FF_LAMBDA_MAX (bad))

Definition at line 257 of file frame.h.

void* AVFrame::opaque

for some private data of the user

Definition at line 320 of file frame.h.

uint64_t AVFrame::error[AV_NUM_DATA_POINTERS]

error

Definition at line 325 of file frame.h.

int AVFrame::repeat_pict

When decoding, this signals how much the picture must be delayed.

extra_delay = repeat_pict / (2*fps)

Definition at line 336 of file frame.h.

int AVFrame::interlaced_frame

The content of the picture is interlaced.

Definition at line 341 of file frame.h.

int AVFrame::top_field_first

If the content is interlaced, is top field displayed first.

Definition at line 346 of file frame.h.

int AVFrame::palette_has_changed

Tell user application that palette has changed from previous frame.

Definition at line 351 of file frame.h.

int64_t AVFrame::reordered_opaque

reordered opaque 64bit (generally an integer or a double precision float PTS but can be anything).

The user sets AVCodecContext.reordered_opaque to represent the input at that time, the decoder reorders values as needed and sets AVFrame.reordered_opaque to exactly one of the values provided by the user through AVCodecContext.reordered_opaque

Deprecated:
in favor of pkt_pts

Definition at line 373 of file frame.h.

int AVFrame::sample_rate

Sample rate of the audio data.

Examples:
filter_audio.c, and muxing.c.

Definition at line 396 of file frame.h.

Referenced by alloc_audio_frame(), and get_input().

uint64_t AVFrame::channel_layout

Channel layout of the audio data.

Examples:
decoding_encoding.c, filter_audio.c, and muxing.c.

Definition at line 401 of file frame.h.

Referenced by alloc_audio_frame(), audio_encode_example(), get_input(), and process_output().

AVBuffer references backing the data for this frame.

If all elements of this array are NULL, then this frame is not reference counted.

There may be at most one AVBuffer per data plane, so for video this array always contains all the references. For planar audio with more than AV_NUM_DATA_POINTERS channels, there may be more buffers than can fit in this array. Then the extra AVBufferRef pointers are stored in the extended_buf array.

Definition at line 413 of file frame.h.

AVBufferRef** AVFrame::extended_buf

For planar audio which requires more than AV_NUM_DATA_POINTERS AVBufferRef pointers, this array will hold all the references which cannot fit into AVFrame.buf.

Note that this is different from AVFrame.extended_data, which always contains all the pointers. This array only contains the extra pointers, which cannot fit into AVFrame.buf.

This array is always allocated using av_malloc() by whoever constructs the frame. It is freed in av_frame_unref().

Definition at line 427 of file frame.h.

int AVFrame::nb_extended_buf

Number of elements in extended_buf.

Definition at line 431 of file frame.h.

AVFrameSideData** AVFrame::side_data

Definition at line 433 of file frame.h.

int AVFrame::nb_side_data

Definition at line 434 of file frame.h.

int AVFrame::flags

Frame flags, a combination of AV_FRAME_FLAGS.

Definition at line 454 of file frame.h.

enum AVColorRange AVFrame::color_range

MPEG vs JPEG YUV range.

It must be accessed using av_frame_get_color_range() and av_frame_set_color_range().

  • encoding: Set by user
  • decoding: Set by libavcodec

Definition at line 463 of file frame.h.

enum AVColorPrimaries AVFrame::color_primaries

Definition at line 465 of file frame.h.

enum AVColorTransferCharacteristic AVFrame::color_trc

Definition at line 467 of file frame.h.

enum AVColorSpace AVFrame::colorspace

YUV colorspace type.

It must be accessed using av_frame_get_colorspace() and av_frame_set_colorspace().

  • encoding: Set by user
  • decoding: Set by libavcodec

Definition at line 476 of file frame.h.

enum AVChromaLocation AVFrame::chroma_location

Definition at line 478 of file frame.h.

int64_t AVFrame::best_effort_timestamp

frame timestamp estimated using various heuristics, in stream time base Code outside libavcodec should access this field using: av_frame_get_best_effort_timestamp(frame)

  • encoding: unused
  • decoding: set by libavcodec, read by user.

Definition at line 487 of file frame.h.

int64_t AVFrame::pkt_pos

reordered pos from the last AVPacket that has been input into the decoder Code outside libavcodec should access this field using: av_frame_get_pkt_pos(frame)

  • encoding: unused
  • decoding: Read by user.

Definition at line 496 of file frame.h.

int64_t AVFrame::pkt_duration

duration of the corresponding packet, expressed in AVStream->time_base units, 0 if unknown.

Code outside libavcodec should access this field using: av_frame_get_pkt_duration(frame)

  • encoding: unused
  • decoding: Read by user.

Definition at line 506 of file frame.h.

AVDictionary* AVFrame::metadata

metadata.

Code outside libavcodec should access this field using: av_frame_get_metadata(frame)

  • encoding: Set by user.
  • decoding: Set by libavcodec.

Definition at line 515 of file frame.h.

int AVFrame::decode_error_flags

decode error flags of the frame, set to a combination of FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there were errors during the decoding.

Code outside libavcodec should access this field using: av_frame_get_decode_error_flags(frame)

  • encoding: unused
  • decoding: set by libavcodec, read by user.

Definition at line 526 of file frame.h.

int AVFrame::channels

number of audio channels, only used for audio.

Code outside libavcodec should access this field using: av_frame_get_channels(frame)

  • encoding: unused
  • decoding: Read by user.

Definition at line 537 of file frame.h.

int AVFrame::pkt_size

size of the corresponding packet containing the compressed frame.

It must be accessed using av_frame_get_pkt_size() and av_frame_set_pkt_size(). It is set to a negative value if unknown.

  • encoding: unused
  • decoding: set by libavcodec, read by user.

Definition at line 547 of file frame.h.

AVBufferRef* AVFrame::qp_table_buf

Not to be accessed directly from outside libavutil.

Definition at line 552 of file frame.h.


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