1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * @ingroup lavu_frame
22 * reference-counted frame API
23 */
24
25 #ifndef AVUTIL_FRAME_H
26 #define AVUTIL_FRAME_H
27
28 #include <stddef.h>
29 #include <stdint.h>
30
39
40
41 /**
42 * @defgroup lavu_frame AVFrame
43 * @ingroup lavu_data
44 *
45 * @{
46 * AVFrame is an abstraction for reference-counted raw multimedia data.
47 */
48
50 /**
51 * The data is the AVPanScan struct defined in libavcodec.
52 */
54 /**
55 * ATSC A53 Part 4 Closed Captions.
56 * A53 CC bitstream is stored as uint8_t in AVFrameSideData.data.
57 * The number of bytes of CC data is AVFrameSideData.size.
58 */
60 /**
61 * Stereoscopic 3d metadata.
62 * The data is the AVStereo3D struct defined in libavutil/stereo3d.h.
63 */
65 /**
66 * The data is the AVMatrixEncoding enum defined in libavutil/channel_layout.h.
67 */
69 /**
70 * Metadata relevant to a downmix procedure.
71 * The data is the AVDownmixInfo struct defined in libavutil/downmix_info.h.
72 */
74 /**
75 * ReplayGain information in the form of the AVReplayGain struct.
76 */
78 /**
79 * This side data contains a 3x3 transformation matrix describing an affine
80 * transformation that needs to be applied to the frame for correct
81 * presentation.
82 *
83 * See libavutil/display.h for a detailed description of the data.
84 */
86 /**
87 * Active Format Description data consisting of a single byte as specified
88 * in ETSI TS 101 154 using AVActiveFormatDescription enum.
89 */
91 /**
92 * Motion vectors exported by some codecs (on demand through the export_mvs
93 * flag set in the libavcodec AVCodecContext flags2 option).
94 * The data is the AVMotionVector struct defined in
95 * libavutil/motion_vector.h.
96 */
98 /**
99 * Recommmends skipping the specified number of samples. This is exported
100 * only if the "skip_manual" AVOption is set in libavcodec.
101 * This has the same format as AV_PKT_DATA_SKIP_SAMPLES.
102 * @code
103 * u32le number of samples to skip from start of this packet
104 * u32le number of samples to skip from end of this packet
105 * u8 reason for start skip
106 * u8 reason for end skip (0=padding silence, 1=convergence)
107 * @endcode
108 */
110 /**
111 * This side data must be associated with an audio frame and corresponds to
112 * enum AVAudioServiceType defined in avcodec.h.
113 */
115 /**
116 * Mastering display metadata associated with a video frame. The payload is
117 * an AVMasteringDisplayMetadata type and contains information about the
118 * mastering display color volume.
119 */
121 /**
122 * The GOP timecode in 25 bit timecode format. Data format is 64-bit integer.
123 * This is set on the first frame of a GOP that has a temporal reference of 0.
124 */
126
127 /**
128 * The data represents the AVSphericalMapping structure defined in
129 * libavutil/spherical.h.
130 */
132
133 /**
134 * Content light level (based on CTA-861.3). This payload contains data in
135 * the form of the AVContentLightMetadata struct.
136 */
138
139 /**
140 * The data contains an ICC profile as an opaque octet buffer following the
141 * format described by ISO 15076-1 with an optional name defined in the
142 * metadata key entry "name".
143 */
145
146 /**
147 * Timecode which conforms to SMPTE ST 12-1. The data is an array of 4 uint32_t
148 * where the first uint32_t describes how many (1-3) of the other timecodes are used.
149 * The timecode format is described in the documentation of av_timecode_get_smpte_from_framenum()
150 * function in libavutil/timecode.h.
151 */
153
154 /**
155 * HDR dynamic metadata associated with a video frame. The payload is
156 * an AVDynamicHDRPlus type and contains information for color
157 * volume transform - application 4 of SMPTE 2094-40:2016 standard.
158 */
160
161 /**
162 * Regions Of Interest, the data is an array of AVRegionOfInterest type, the number of
163 * array element is implied by AVFrameSideData.size / AVRegionOfInterest.self_size.
164 */
166
167 /**
168 * Encoding parameters for a video frame, as described by AVVideoEncParams.
169 */
171
172 /**
173 * User data unregistered metadata associated with a video frame.
174 * This is the H.26[45] UDU SEI message, and shouldn't be used for any other purpose
175 * The data is stored as uint8_t in AVFrameSideData.data which is 16 bytes of
176 * uuid_iso_iec_11578 followed by AVFrameSideData.size - 16 bytes of user_data_payload_byte.
177 */
179
180 /**
181 * Film grain parameters for a frame, described by AVFilmGrainParams.
182 * Must be present for every frame which should have film grain applied.
183 */
185
186 /**
187 * Bounding boxes for object detection and classification,
188 * as described by AVDetectionBBoxHeader.
189 */
191
192 /**
193 * Dolby Vision RPU raw data, suitable for passing to x265
194 * or other libraries. Array of uint8_t, with NAL emulation
195 * bytes intact.
196 */
198
199 /**
200 * Parsed Dolby Vision metadata, suitable for passing to a software
201 * implementation. The payload is the AVDOVIMetadata struct defined in
202 * libavutil/dovi_meta.h.
203 */
205
206 /**
207 * HDR Vivid dynamic metadata associated with a video frame. The payload is
208 * an AVDynamicHDRVivid type and contains information for color
209 * volume transform - CUVA 005.1-2021.
210 */
212 };
213
222 };
223
224
225 /**
226 * Structure to hold side data for an AVFrame.
227 *
228 * sizeof(AVFrameSideData) is not a part of the public ABI, so new fields may be added
229 * to the end with a minor bump.
230 */
238
239 /**
240 * Structure describing a single Region Of Interest.
241 *
242 * When multiple regions are defined in a single side-data block, they
243 * should be ordered from most to least important - some encoders are only
244 * capable of supporting a limited number of distinct regions, so will have
245 * to truncate the list.
246 *
247 * When overlapping regions are defined, the first region containing a given
248 * area of the frame applies.
249 */
251 /**
252 * Must be set to the size of this data structure (that is,
253 * sizeof(AVRegionOfInterest)).
254 */
256 /**
257 * Distance in pixels from the top edge of the frame to the top and
258 * bottom edges and from the left edge of the frame to the left and
259 * right edges of the rectangle defining this region of interest.
260 *
261 * The constraints on a region are encoder dependent, so the region
262 * actually affected may be slightly larger for alignment or other
263 * reasons.
264 */
269 /**
270 * Quantisation offset.
271 *
272 * Must be in the range -1 to +1. A value of zero indicates no quality
273 * change. A negative value asks for better quality (less quantisation),
274 * while a positive value asks for worse quality (greater quantisation).
275 *
276 * The range is calibrated so that the extreme values indicate the
277 * largest possible offset - if the rest of the frame is encoded with the
278 * worst possible quality, an offset of -1 indicates that this region
279 * should be encoded with the best possible quality anyway. Intermediate
280 * values are then interpolated in some codec-dependent way.
281 *
282 * For example, in 10-bit H.264 the quantisation parameter varies between
283 * -12 and 51. A typical qoffset value of -1/10 therefore indicates that
284 * this region should be encoded with a QP around one-tenth of the full
285 * range better than the rest of the frame. So, if most of the frame
286 * were to be encoded with a QP of around 30, this region would get a QP
287 * of around 24 (an offset of approximately -1/10 * (51 - -12) = -6.3).
288 * An extreme value of -1 would indicate that this region should be
289 * encoded with the best possible quality regardless of the treatment of
290 * the rest of the frame - that is, should be encoded at a QP of -12.
291 */
294
295 /**
296 * This structure describes decoded (raw) audio or video data.
297 *
298 * AVFrame must be allocated using av_frame_alloc(). Note that this only
299 * allocates the AVFrame itself, the buffers for the data must be managed
300 * through other means (see below).
301 * AVFrame must be freed with av_frame_free().
302 *
303 * AVFrame is typically allocated once and then reused multiple times to hold
304 * different data (e.g. a single AVFrame to hold frames received from a
305 * decoder). In such a case, av_frame_unref() will free any references held by
306 * the frame and reset it to its original clean state before it
307 * is reused again.
308 *
309 * The data described by an AVFrame is usually reference counted through the
310 * AVBuffer API. The underlying buffer references are stored in AVFrame.buf /
311 * AVFrame.extended_buf. An AVFrame is considered to be reference counted if at
312 * least one reference is set, i.e. if AVFrame.buf[0] != NULL. In such a case,
313 * every single data plane must be contained in one of the buffers in
314 * AVFrame.buf or AVFrame.extended_buf.
315 * There may be a single buffer for all the data, or one separate buffer for
316 * each plane, or anything in between.
317 *
318 * sizeof(AVFrame) is not a part of the public ABI, so new fields may be added
319 * to the end with a minor bump.
320 *
321 * Fields can be accessed through AVOptions, the name string used, matches the
322 * C structure field name for fields accessible through AVOptions. The AVClass
323 * for AVFrame can be obtained from avcodec_get_frame_class()
324 */
326 #define AV_NUM_DATA_POINTERS 8
327 /**
328 * pointer to the picture/channel planes.
329 * This might be different from the first allocated byte. For video,
330 * it could even point to the end of the image data.
331 *
332 * All pointers in data and extended_data must point into one of the
333 * AVBufferRef in buf or extended_buf.
334 *
335 * Some decoders access areas outside 0,0 - width,height, please
336 * see avcodec_align_dimensions2(). Some filters and swscale can read
337 * up to 16 bytes beyond the planes, if these filters are to be used,
338 * then 16 extra bytes must be allocated.
339 *
340 * NOTE: Pointers not needed by the format MUST be set to NULL.
341 *
342 * @attention In case of video, the data[] pointers can point to the
343 * end of image data in order to reverse line order, when used in
344 * combination with negative values in the linesize[] array.
345 */
347
348 /**
349 * For video, a positive or negative value, which is typically indicating
350 * the size in bytes of each picture line, but it can also be:
351 * - the negative byte size of lines for vertical flipping
352 * (with data[n] pointing to the end of the data
353 * - a positive or negative multiple of the byte size as for accessing
354 * even and odd fields of a frame (possibly flipped)
355 *
356 * For audio, only linesize[0] may be set. For planar audio, each channel
357 * plane must be the same size.
358 *
359 * For video the linesizes should be multiples of the CPUs alignment
360 * preference, this is 16 or 32 for modern desktop CPUs.
361 * Some code requires such alignment other code can be slower without
362 * correct alignment, for yet other it makes no difference.
363 *
364 * @note The linesize may be larger than the size of usable data -- there
365 * may be extra padding present for performance reasons.
366 *
367 * @attention In case of video, line size values can be negative to achieve
368 * a vertically inverted iteration over image lines.
369 */
371
372 /**
373 * pointers to the data planes/channels.
374 *
375 * For video, this should simply point to data[].
376 *
377 * For planar audio, each channel has a separate data pointer, and
378 * linesize[0] contains the size of each channel buffer.
379 * For packed audio, there is just one data pointer, and linesize[0]
380 * contains the total size of the buffer for all channels.
381 *
382 * Note: Both data and extended_data should always be set in a valid frame,
383 * but for planar audio with more channels that can fit in data,
384 * extended_data must be used in order to access all channels.
385 */
387
388 /**
389 * @name Video dimensions
390 * Video frames only. The coded dimensions (in pixels) of the video frame,
391 * i.e. the size of the rectangle that contains some well-defined values.
392 *
393 * @note The part of the frame intended for display/presentation is further
394 * restricted by the @ref cropping "Cropping rectangle".
395 * @{
396 */
398 /**
399 * @}
400 */
401
402 /**
403 * number of audio samples (per channel) described by this frame
404 */
406
407 /**
408 * format of the frame, -1 if unknown or unset
409 * Values correspond to enum AVPixelFormat for video frames,
410 * enum AVSampleFormat for audio)
411 */
413
414 /**
415 * 1 -> keyframe, 0-> not
416 */
418
419 /**
420 * Picture type of the frame.
421 */
423
424 /**
425 * Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
426 */
428
429 /**
430 * Presentation timestamp in time_base units (time when frame should be shown to user).
431 */
433
434 /**
435 * DTS copied from the AVPacket that triggered returning this frame. (if frame threading isn't used)
436 * This is also the Presentation time of this AVFrame calculated from
437 * only AVPacket.dts values without pts values.
438 */
440
441 /**
442 * Time base for the timestamps in this frame.
443 * In the future, this field may be set on frames output by decoders or
444 * filters, but its value will be by default ignored on input to encoders
445 * or filters.
446 */
448
449 /**
450 * picture number in bitstream order
451 */
453 /**
454 * picture number in display order
455 */
457
458 /**
459 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
460 */
462
463 /**
464 * for some private data of the user
465 */
467
468 /**
469 * When decoding, this signals how much the picture must be delayed.
470 * extra_delay = repeat_pict / (2*fps)
471 */
473
474 /**
475 * The content of the picture is interlaced.
476 */
478
479 /**
480 * If the content is interlaced, is top field displayed first.
481 */
483
484 /**
485 * Tell user application that palette has changed from previous frame.
486 */
488
489 /**
490 * reordered opaque 64 bits (generally an integer or a double precision float
491 * PTS but can be anything).
492 * The user sets AVCodecContext.reordered_opaque to represent the input at
493 * that time,
494 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
495 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
496 */
498
499 /**
500 * Sample rate of the audio data.
501 */
503
504 #if FF_API_OLD_CHANNEL_LAYOUT
505 /**
506 * Channel layout of the audio data.
507 * @deprecated use ch_layout instead
508 */
511 #endif
512
513 /**
514 * AVBuffer references backing the data for this frame. All the pointers in
515 * data and extended_data must point inside one of the buffers in buf or
516 * extended_buf. This array must be filled contiguously -- if buf[i] is
517 * non-NULL then buf[j] must also be non-NULL for all j < i.
518 *
519 * There may be at most one AVBuffer per data plane, so for video this array
520 * always contains all the references. For planar audio with more than
521 * AV_NUM_DATA_POINTERS channels, there may be more buffers than can fit in
522 * this array. Then the extra AVBufferRef pointers are stored in the
523 * extended_buf array.
524 */
526
527 /**
528 * For planar audio which requires more than AV_NUM_DATA_POINTERS
529 * AVBufferRef pointers, this array will hold all the references which
530 * cannot fit into AVFrame.buf.
531 *
532 * Note that this is different from AVFrame.extended_data, which always
533 * contains all the pointers. This array only contains the extra pointers,
534 * which cannot fit into AVFrame.buf.
535 *
536 * This array is always allocated using av_malloc() by whoever constructs
537 * the frame. It is freed in av_frame_unref().
538 */
540 /**
541 * Number of elements in extended_buf.
542 */
544
547
548 /**
549 * @defgroup lavu_frame_flags AV_FRAME_FLAGS
550 * @ingroup lavu_frame
551 * Flags describing additional frame properties.
552 *
553 * @{
554 */
555
556 /**
557 * The frame data may be corrupted, e.g. due to decoding errors.
558 */
559 #define AV_FRAME_FLAG_CORRUPT (1 << 0)
560 /**
561 * A flag to mark the frames which need to be decoded, but shouldn't be output.
562 */
563 #define AV_FRAME_FLAG_DISCARD (1 << 2)
564 /**
565 * @}
566 */
567
568 /**
569 * Frame flags, a combination of @ref lavu_frame_flags
570 */
572
573 /**
574 * MPEG vs JPEG YUV range.
575 * - encoding: Set by user
576 * - decoding: Set by libavcodec
577 */
579
581
583
584 /**
585 * YUV colorspace type.
586 * - encoding: Set by user
587 * - decoding: Set by libavcodec
588 */
590
592
593 /**
594 * frame timestamp estimated using various heuristics, in stream time base
595 * - encoding: unused
596 * - decoding: set by libavcodec, read by user.
597 */
599
600 /**
601 * reordered pos from the last AVPacket that has been input into the decoder
602 * - encoding: unused
603 * - decoding: Read by user.
604 */
606
607 /**
608 * duration of the corresponding packet, expressed in
609 * AVStream->time_base units, 0 if unknown.
610 * - encoding: unused
611 * - decoding: Read by user.
612 */
614
615 /**
616 * metadata.
617 * - encoding: Set by user.
618 * - decoding: Set by libavcodec.
619 */
621
622 /**
623 * decode error flags of the frame, set to a combination of
624 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
625 * were errors during the decoding.
626 * - encoding: unused
627 * - decoding: set by libavcodec, read by user.
628 */
630 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
631 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
632 #define FF_DECODE_ERROR_CONCEALMENT_ACTIVE 4
633 #define FF_DECODE_ERROR_DECODE_SLICES 8
634
635 #if FF_API_OLD_CHANNEL_LAYOUT
636 /**
637 * number of audio channels, only used for audio.
638 * - encoding: unused
639 * - decoding: Read by user.
640 * @deprecated use ch_layout instead
641 */
644 #endif
645
646 /**
647 * size of the corresponding packet containing the compressed
648 * frame.
649 * It is set to a negative value if unknown.
650 * - encoding: unused
651 * - decoding: set by libavcodec, read by user.
652 */
654
655 /**
656 * For hwaccel-format frames, this should be a reference to the
657 * AVHWFramesContext describing the frame.
658 */
660
661 /**
662 * AVBufferRef for free use by the API user. FFmpeg will never check the
663 * contents of the buffer ref. FFmpeg calls av_buffer_unref() on it when
664 * the frame is unreferenced. av_frame_copy_props() calls create a new
665 * reference with av_buffer_ref() for the target frame's opaque_ref field.
666 *
667 * This is unrelated to the opaque field, although it serves a similar
668 * purpose.
669 */
671
672 /**
673 * @anchor cropping
674 * @name Cropping
675 * Video frames only. The number of pixels to discard from the the
676 * top/bottom/left/right border of the frame to obtain the sub-rectangle of
677 * the frame intended for presentation.
678 * @{
679 */
684 /**
685 * @}
686 */
687
688 /**
689 * AVBufferRef for internal use by a single libav* library.
690 * Must not be used to transfer data between libraries.
691 * Has to be NULL when ownership of the frame leaves the respective library.
692 *
693 * Code outside the FFmpeg libs should never check or change the contents of the buffer ref.
694 *
695 * FFmpeg calls av_buffer_unref() on it when the frame is unreferenced.
696 * av_frame_copy_props() calls create a new reference with av_buffer_ref()
697 * for the target frame's private_ref field.
698 */
700
701 /**
702 * Channel layout of the audio data.
703 */
706
707
708 #if FF_API_COLORSPACE_NAME
709 /**
710 * Get the name of a colorspace.
711 * @return a static string identifying the colorspace; can be NULL.
712 * @deprecated use av_color_space_name()
713 */
716 #endif
717 /**
718 * Allocate an AVFrame and set its fields to default values. The resulting
719 * struct must be freed using av_frame_free().
720 *
721 * @return An AVFrame filled with default values or NULL on failure.
722 *
723 * @note this only allocates the AVFrame itself, not the data buffers. Those
724 * must be allocated through other means, e.g. with av_frame_get_buffer() or
725 * manually.
726 */
728
729 /**
730 * Free the frame and any dynamically allocated objects in it,
731 * e.g. extended_data. If the frame is reference counted, it will be
732 * unreferenced first.
733 *
734 * @param frame frame to be freed. The pointer will be set to NULL.
735 */
737
738 /**
739 * Set up a new reference to the data described by the source frame.
740 *
741 * Copy frame properties from src to dst and create a new reference for each
742 * AVBufferRef from src.
743 *
744 * If src is not reference counted, new buffers are allocated and the data is
745 * copied.
746 *
747 * @warning: dst MUST have been either unreferenced with av_frame_unref(dst),
748 * or newly allocated with av_frame_alloc() before calling this
749 * function, or undefined behavior will occur.
750 *
751 * @return 0 on success, a negative AVERROR on error
752 */
754
755 /**
756 * Create a new frame that references the same data as src.
757 *
758 * This is a shortcut for av_frame_alloc()+av_frame_ref().
759 *
760 * @return newly created AVFrame on success, NULL on error.
761 */
763
764 /**
765 * Unreference all the buffers referenced by frame and reset the frame fields.
766 */
768
769 /**
770 * Move everything contained in src to dst and reset src.
771 *
772 * @warning: dst is not unreferenced, but directly overwritten without reading
773 * or deallocating its contents. Call av_frame_unref(dst) manually
774 * before calling this function to ensure that no memory is leaked.
775 */
777
778 /**
779 * Allocate new buffer(s) for audio or video data.
780 *
781 * The following fields must be set on frame before calling this function:
782 * - format (pixel format for video, sample format for audio)
783 * - width and height for video
784 * - nb_samples and ch_layout for audio
785 *
786 * This function will fill AVFrame.data and AVFrame.buf arrays and, if
787 * necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
788 * For planar formats, one buffer will be allocated for each plane.
789 *
790 * @warning: if frame already has been allocated, calling this function will
791 * leak memory. In addition, undefined behavior can occur in certain
792 * cases.
793 *
794 * @param frame frame in which to store the new buffers.
795 * @param align Required buffer size alignment. If equal to 0, alignment will be
796 * chosen automatically for the current CPU. It is highly
797 * recommended to pass 0 here unless you know what you are doing.
798 *
799 * @return 0 on success, a negative AVERROR on error.
800 */
802
803 /**
804 * Check if the frame data is writable.
805 *
806 * @return A positive value if the frame data is writable (which is true if and
807 * only if each of the underlying buffers has only one reference, namely the one
808 * stored in this frame). Return 0 otherwise.
809 *
810 * If 1 is returned the answer is valid until av_buffer_ref() is called on any
811 * of the underlying AVBufferRefs (e.g. through av_frame_ref() or directly).
812 *
813 * @see av_frame_make_writable(), av_buffer_is_writable()
814 */
816
817 /**
818 * Ensure that the frame data is writable, avoiding data copy if possible.
819 *
820 * Do nothing if the frame is writable, allocate new buffers and copy the data
821 * if it is not.
822 *
823 * @return 0 on success, a negative AVERROR on error.
824 *
825 * @see av_frame_is_writable(), av_buffer_is_writable(),
826 * av_buffer_make_writable()
827 */
829
830 /**
831 * Copy the frame data from src to dst.
832 *
833 * This function does not allocate anything, dst must be already initialized and
834 * allocated with the same parameters as src.
835 *
836 * This function only copies the frame data (i.e. the contents of the data /
837 * extended data arrays), not any other properties.
838 *
839 * @return >= 0 on success, a negative AVERROR on error.
840 */
842
843 /**
844 * Copy only "metadata" fields from src to dst.
845 *
846 * Metadata for the purpose of this function are those fields that do not affect
847 * the data layout in the buffers. E.g. pts, sample rate (for audio) or sample
848 * aspect ratio (for video), but not width/height or channel layout.
849 * Side data is also copied.
850 */
852
853 /**
854 * Get the buffer reference a given data plane is stored in.
855 *
856 * @param plane index of the data plane of interest in frame->extended_data.
857 *
858 * @return the buffer reference that contains the plane or NULL if the input
859 * frame is not valid.
860 */
862
863 /**
864 * Add a new side data to a frame.
865 *
866 * @param frame a frame to which the side data should be added
867 * @param type type of the added side data
868 * @param size size of the side data
869 *
870 * @return newly added side data on success, NULL on error
871 */
875
876 /**
877 * Add a new side data to a frame from an existing AVBufferRef
878 *
879 * @param frame a frame to which the side data should be added
880 * @param type the type of the added side data
881 * @param buf an AVBufferRef to add as side data. The ownership of
882 * the reference is transferred to the frame.
883 *
884 * @return newly added side data on success, NULL on error. On failure
885 * the frame is unchanged and the AVBufferRef remains owned by
886 * the caller.
887 */
891
892 /**
893 * @return a pointer to the side data of a given type on success, NULL if there
894 * is no side data with such type in this frame.
895 */
898
899 /**
900 * Remove and free all side data instances of the given type.
901 */
903
904
905 /**
906 * Flags for frame cropping.
907 */
908 enum {
909 /**
910 * Apply the maximum possible cropping, even if it requires setting the
911 * AVFrame.data[] entries to unaligned pointers. Passing unaligned data
912 * to FFmpeg API is generally not allowed, and causes undefined behavior
913 * (such as crashes). You can pass unaligned data only to FFmpeg APIs that
914 * are explicitly documented to accept it. Use this flag only if you
915 * absolutely know what you are doing.
916 */
918 };
919
920 /**
921 * Crop the given video AVFrame according to its crop_left/crop_top/crop_right/
922 * crop_bottom fields. If cropping is successful, the function will adjust the
923 * data pointers and the width/height fields, and set the crop fields to 0.
924 *
925 * In all cases, the cropping boundaries will be rounded to the inherent
926 * alignment of the pixel format. In some cases, such as for opaque hwaccel
927 * formats, the left/top cropping is ignored. The crop fields are set to 0 even
928 * if the cropping was rounded or ignored.
929 *
930 * @param frame the frame which should be cropped
931 * @param flags Some combination of AV_FRAME_CROP_* flags, or 0.
932 *
933 * @return >= 0 on success, a negative AVERROR on error. If the cropping fields
934 * were invalid, AVERROR(ERANGE) is returned, and nothing is changed.
935 */
937
938 /**
939 * @return a string identifying the side data type
940 */
942
943 /**
944 * @}
945 */
946
947 #endif /* AVUTIL_FRAME_H */