1 /*
2 *
3 * This file is part of FFmpeg.
4 *
5 * FFmpeg is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * FFmpeg is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with FFmpeg; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /**
21 * @file
22 * @ingroup lavu_frame
23 * reference-counted frame API
24 */
25
26 #ifndef AVUTIL_FRAME_H
27 #define AVUTIL_FRAME_H
28
29 #include <stdint.h>
30
38
39
40 /**
41 * @defgroup lavu_frame AVFrame
42 * @ingroup lavu_data
43 *
44 * @{
45 * AVFrame is an abstraction for reference-counted raw multimedia data.
46 */
47
49 /**
50 * The data is the AVPanScan struct defined in libavcodec.
51 */
53 /**
54 * ATSC A53 Part 4 Closed Captions.
55 * A53 CC bitstream is stored as uint8_t in AVFrameSideData.data.
56 * The number of bytes of CC data is AVFrameSideData.size.
57 */
59 /**
60 * Stereoscopic 3d metadata.
61 * The data is the AVStereo3D struct defined in libavutil/stereo3d.h.
62 */
64 /**
65 * The data is the AVMatrixEncoding enum defined in libavutil/channel_layout.h.
66 */
68 /**
69 * Metadata relevant to a downmix procedure.
70 * The data is the AVDownmixInfo struct defined in libavutil/downmix_info.h.
71 */
73 /**
74 * ReplayGain information in the form of the AVReplayGain struct.
75 */
77 /**
78 * This side data contains a 3x3 transformation matrix describing an affine
79 * transformation that needs to be applied to the frame for correct
80 * presentation.
81 *
82 * See libavutil/display.h for a detailed description of the data.
83 */
85 /**
86 * Active Format Description data consisting of a single byte as specified
87 * in ETSI TS 101 154 using AVActiveFormatDescription enum.
88 */
90 /**
91 * Motion vectors exported by some codecs (on demand through the export_mvs
92 * flag set in the libavcodec AVCodecContext flags2 option).
93 * The data is the AVMotionVector struct defined in
94 * libavutil/motion_vector.h.
95 */
97 /**
98 * Recommmends skipping the specified number of samples. This is exported
99 * only if the "skip_manual" AVOption is set in libavcodec.
100 * This has the same format as AV_PKT_DATA_SKIP_SAMPLES.
101 * @code
102 * u32le number of samples to skip from start of this packet
103 * u32le number of samples to skip from end of this packet
104 * u8 reason for start skip
105 * u8 reason for end skip (0=padding silence, 1=convergence)
106 * @endcode
107 */
109
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
125 };
126
133
134 /**
135 * This structure describes decoded (raw) audio or video data.
136 *
137 * AVFrame must be allocated using av_frame_alloc(). Note that this only
138 * allocates the AVFrame itself, the buffers for the data must be managed
139 * through other means (see below).
140 * AVFrame must be freed with av_frame_free().
141 *
142 * AVFrame is typically allocated once and then reused multiple times to hold
143 * different data (e.g. a single AVFrame to hold frames received from a
144 * decoder). In such a case, av_frame_unref() will free any references held by
145 * the frame and reset it to its original clean state before it
146 * is reused again.
147 *
148 * The data described by an AVFrame is usually reference counted through the
149 * AVBuffer API. The underlying buffer references are stored in AVFrame.buf /
150 * AVFrame.extended_buf. An AVFrame is considered to be reference counted if at
151 * least one reference is set, i.e. if AVFrame.buf[0] != NULL. In such a case,
152 * every single data plane must be contained in one of the buffers in
153 * AVFrame.buf or AVFrame.extended_buf.
154 * There may be a single buffer for all the data, or one separate buffer for
155 * each plane, or anything in between.
156 *
157 * sizeof(AVFrame) is not a part of the public ABI, so new fields may be added
158 * to the end with a minor bump.
159 * Similarly fields that are marked as to be only accessed by
160 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
161 * without breaking compatibility with each other.
162 */
164 #define AV_NUM_DATA_POINTERS 8
165 /**
166 * pointer to the picture/channel planes.
167 * This might be different from the first allocated byte
168 *
169 * Some decoders access areas outside 0,0 - width,height, please
170 * see avcodec_align_dimensions2(). Some filters and swscale can read
171 * up to 16 bytes beyond the planes, if these filters are to be used,
172 * then 16 extra bytes must be allocated.
173 */
175
176 /**
177 * For video, size in bytes of each picture line.
178 * For audio, size in bytes of each plane.
179 *
180 * For audio, only linesize[0] may be set. For planar audio, each channel
181 * plane must be the same size.
182 *
183 * For video the linesizes should be multiples of the CPUs alignment
184 * preference, this is 16 or 32 for modern desktop CPUs.
185 * Some code requires such alignment other code can be slower without
186 * correct alignment, for yet other it makes no difference.
187 *
188 * @note The linesize may be larger than the size of usable data -- there
189 * may be extra padding present for performance reasons.
190 */
192
193 /**
194 * pointers to the data planes/channels.
195 *
196 * For video, this should simply point to data[].
197 *
198 * For planar audio, each channel has a separate data pointer, and
199 * linesize[0] contains the size of each channel buffer.
200 * For packed audio, there is just one data pointer, and linesize[0]
201 * contains the total size of the buffer for all channels.
202 *
203 * Note: Both data and extended_data should always be set in a valid frame,
204 * but for planar audio with more channels that can fit in data,
205 * extended_data must be used in order to access all channels.
206 */
208
209 /**
210 * width and height of the video frame
211 */
213
214 /**
215 * number of audio samples (per channel) described by this frame
216 */
218
219 /**
220 * format of the frame, -1 if unknown or unset
221 * Values correspond to enum AVPixelFormat for video frames,
222 * enum AVSampleFormat for audio)
223 */
225
226 /**
227 * 1 -> keyframe, 0-> not
228 */
230
231 /**
232 * Picture type of the frame.
233 */
235
236 #if FF_API_AVFRAME_LAVC
239 #endif
240
241 /**
242 * Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
243 */
245
246 /**
247 * Presentation timestamp in time_base units (time when frame should be shown to user).
248 */
250
251 /**
252 * PTS copied from the AVPacket that was decoded to produce this frame.
253 */
255
256 /**
257 * DTS copied from the AVPacket that triggered returning this frame. (if frame threading isn't used)
258 * This is also the Presentation time of this AVFrame calculated from
259 * only AVPacket.dts values without pts values.
260 */
262
263 /**
264 * picture number in bitstream order
265 */
267 /**
268 * picture number in display order
269 */
271
272 /**
273 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
274 */
276
277 #if FF_API_AVFRAME_LAVC
280
281 /**
282 * QP table
283 */
286 /**
287 * QP store stride
288 */
291
294
295 /**
296 * mbskip_table[mb]>=1 if MB didn't change
297 * stride= mb_width = (width+15)>>4
298 */
301
302 /**
303 * motion vector table
304 * @code
305 * example:
306 * int mv_sample_log2= 4 - motion_subsample_log2;
307 * int mb_width= (width+15)>>4;
308 * int mv_stride= (mb_width << mv_sample_log2) + 1;
309 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
310 * @endcode
311 */
313
314 /**
315 * macroblock type table
316 * mb_type_base + mb_width + 2
317 */
320
321 /**
322 * DCT coefficients
323 */
326
327 /**
328 * motion reference frame index
329 * the order in which these are stored can depend on the codec.
330 */
333 #endif
334
335 /**
336 * for some private data of the user
337 */
339
340 /**
341 * error
342 */
344
345 #if FF_API_AVFRAME_LAVC
348 #endif
349
350 /**
351 * When decoding, this signals how much the picture must be delayed.
352 * extra_delay = repeat_pict / (2*fps)
353 */
355
356 /**
357 * The content of the picture is interlaced.
358 */
360
361 /**
362 * If the content is interlaced, is top field displayed first.
363 */
365
366 /**
367 * Tell user application that palette has changed from previous frame.
368 */
370
371 #if FF_API_AVFRAME_LAVC
374
375 /**
376 * Pan scan.
377 */
380 #endif
381
382 /**
383 * reordered opaque 64bit (generally an integer or a double precision float
384 * PTS but can be anything).
385 * The user sets AVCodecContext.reordered_opaque to represent the input at
386 * that time,
387 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
388 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
389 * @deprecated in favor of pkt_pts
390 */
392
393 #if FF_API_AVFRAME_LAVC
394 /**
395 * @deprecated this field is unused
396 */
398
403
404 /**
405 * log2 of the size of the block which a single vector in motion_val represents:
406 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
407 */
409 #endif
410
411 /**
412 * Sample rate of the audio data.
413 */
415
416 /**
417 * Channel layout of the audio data.
418 */
420
421 /**
422 * AVBuffer references backing the data for this frame. If all elements of
423 * this array are NULL, then this frame is not reference counted. This array
424 * must be filled contiguously -- if buf[i] is non-NULL then buf[j] must
425 * also be non-NULL for all j < i.
426 *
427 * There may be at most one AVBuffer per data plane, so for video this array
428 * always contains all the references. For planar audio with more than
429 * AV_NUM_DATA_POINTERS channels, there may be more buffers than can fit in
430 * this array. Then the extra AVBufferRef pointers are stored in the
431 * extended_buf array.
432 */
434
435 /**
436 * For planar audio which requires more than AV_NUM_DATA_POINTERS
437 * AVBufferRef pointers, this array will hold all the references which
438 * cannot fit into AVFrame.buf.
439 *
440 * Note that this is different from AVFrame.extended_data, which always
441 * contains all the pointers. This array only contains the extra pointers,
442 * which cannot fit into AVFrame.buf.
443 *
444 * This array is always allocated using av_malloc() by whoever constructs
445 * the frame. It is freed in av_frame_unref().
446 */
448 /**
449 * Number of elements in extended_buf.
450 */
452
455
456 /**
457 * @defgroup lavu_frame_flags AV_FRAME_FLAGS
458 * Flags describing additional frame properties.
459 *
460 * @{
461 */
462
463 /**
464 * The frame data may be corrupted, e.g. due to decoding errors.
465 */
466 #define AV_FRAME_FLAG_CORRUPT (1 << 0)
467 /**
468 * @}
469 */
470
471 /**
472 * Frame flags, a combination of @ref lavu_frame_flags
473 */
475
476 /**
477 * MPEG vs JPEG YUV range.
478 * It must be accessed using av_frame_get_color_range() and
479 * av_frame_set_color_range().
480 * - encoding: Set by user
481 * - decoding: Set by libavcodec
482 */
484
486
488
489 /**
490 * YUV colorspace type.
491 * It must be accessed using av_frame_get_colorspace() and
492 * av_frame_set_colorspace().
493 * - encoding: Set by user
494 * - decoding: Set by libavcodec
495 */
497
499
500 /**
501 * frame timestamp estimated using various heuristics, in stream time base
502 * Code outside libavcodec should access this field using:
503 * av_frame_get_best_effort_timestamp(frame)
504 * - encoding: unused
505 * - decoding: set by libavcodec, read by user.
506 */
508
509 /**
510 * reordered pos from the last AVPacket that has been input into the decoder
511 * Code outside libavcodec should access this field using:
512 * av_frame_get_pkt_pos(frame)
513 * - encoding: unused
514 * - decoding: Read by user.
515 */
517
518 /**
519 * duration of the corresponding packet, expressed in
520 * AVStream->time_base units, 0 if unknown.
521 * Code outside libavcodec should access this field using:
522 * av_frame_get_pkt_duration(frame)
523 * - encoding: unused
524 * - decoding: Read by user.
525 */
527
528 /**
529 * metadata.
530 * Code outside libavcodec should access this field using:
531 * av_frame_get_metadata(frame)
532 * - encoding: Set by user.
533 * - decoding: Set by libavcodec.
534 */
536
537 /**
538 * decode error flags of the frame, set to a combination of
539 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
540 * were errors during the decoding.
541 * Code outside libavcodec should access this field using:
542 * av_frame_get_decode_error_flags(frame)
543 * - encoding: unused
544 * - decoding: set by libavcodec, read by user.
545 */
547 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
548 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
549
550 /**
551 * number of audio channels, only used for audio.
552 * Code outside libavcodec should access this field using:
553 * av_frame_get_channels(frame)
554 * - encoding: unused
555 * - decoding: Read by user.
556 */
558
559 /**
560 * size of the corresponding packet containing the compressed
561 * frame. It must be accessed using av_frame_get_pkt_size() and
562 * av_frame_set_pkt_size().
563 * It is set to a negative value if unknown.
564 * - encoding: unused
565 * - decoding: set by libavcodec, read by user.
566 */
568
569 /**
570 * Not to be accessed directly from outside libavutil
571 */
574
575 /**
576 * Accessors for some AVFrame fields.
577 * The position of these field in the structure is not part of the ABI,
578 * they should not be accessed directly outside libavcodec.
579 */
605
606 /**
607 * Get the name of a colorspace.
608 * @return a static string identifying the colorspace; can be NULL.
609 */
611
612 /**
613 * Allocate an AVFrame and set its fields to default values. The resulting
614 * struct must be freed using av_frame_free().
615 *
616 * @return An AVFrame filled with default values or NULL on failure.
617 *
618 * @note this only allocates the AVFrame itself, not the data buffers. Those
619 * must be allocated through other means, e.g. with av_frame_get_buffer() or
620 * manually.
621 */
623
624 /**
625 * Free the frame and any dynamically allocated objects in it,
626 * e.g. extended_data. If the frame is reference counted, it will be
627 * unreferenced first.
628 *
629 * @param frame frame to be freed. The pointer will be set to NULL.
630 */
632
633 /**
634 * Set up a new reference to the data described by the source frame.
635 *
636 * Copy frame properties from src to dst and create a new reference for each
637 * AVBufferRef from src.
638 *
639 * If src is not reference counted, new buffers are allocated and the data is
640 * copied.
641 *
642 * @return 0 on success, a negative AVERROR on error
643 */
645
646 /**
647 * Create a new frame that references the same data as src.
648 *
649 * This is a shortcut for av_frame_alloc()+av_frame_ref().
650 *
651 * @return newly created AVFrame on success, NULL on error.
652 */
654
655 /**
656 * Unreference all the buffers referenced by frame and reset the frame fields.
657 */
659
660 /**
661 * Move everythnig contained in src to dst and reset src.
662 */
664
665 /**
666 * Allocate new buffer(s) for audio or video data.
667 *
668 * The following fields must be set on frame before calling this function:
669 * - format (pixel format for video, sample format for audio)
670 * - width and height for video
671 * - nb_samples and channel_layout for audio
672 *
673 * This function will fill AVFrame.data and AVFrame.buf arrays and, if
674 * necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
675 * For planar formats, one buffer will be allocated for each plane.
676 *
677 * @param frame frame in which to store the new buffers.
678 * @param align required buffer size alignment
679 *
680 * @return 0 on success, a negative AVERROR on error.
681 */
683
684 /**
685 * Check if the frame data is writable.
686 *
687 * @return A positive value if the frame data is writable (which is true if and
688 * only if each of the underlying buffers has only one reference, namely the one
689 * stored in this frame). Return 0 otherwise.
690 *
691 * If 1 is returned the answer is valid until av_buffer_ref() is called on any
692 * of the underlying AVBufferRefs (e.g. through av_frame_ref() or directly).
693 *
694 * @see av_frame_make_writable(), av_buffer_is_writable()
695 */
697
698 /**
699 * Ensure that the frame data is writable, avoiding data copy if possible.
700 *
701 * Do nothing if the frame is writable, allocate new buffers and copy the data
702 * if it is not.
703 *
704 * @return 0 on success, a negative AVERROR on error.
705 *
706 * @see av_frame_is_writable(), av_buffer_is_writable(),
707 * av_buffer_make_writable()
708 */
710
711 /**
712 * Copy the frame data from src to dst.
713 *
714 * This function does not allocate anything, dst must be already initialized and
715 * allocated with the same parameters as src.
716 *
717 * This function only copies the frame data (i.e. the contents of the data /
718 * extended data arrays), not any other properties.
719 *
720 * @return >= 0 on success, a negative AVERROR on error.
721 */
723
724 /**
725 * Copy only "metadata" fields from src to dst.
726 *
727 * Metadata for the purpose of this function are those fields that do not affect
728 * the data layout in the buffers. E.g. pts, sample rate (for audio) or sample
729 * aspect ratio (for video), but not width/height or channel layout.
730 * Side data is also copied.
731 */
733
734 /**
735 * Get the buffer reference a given data plane is stored in.
736 *
737 * @param plane index of the data plane of interest in frame->extended_data.
738 *
739 * @return the buffer reference that contains the plane or NULL if the input
740 * frame is not valid.
741 */
743
744 /**
745 * Add a new side data to a frame.
746 *
747 * @param frame a frame to which the side data should be added
748 * @param type type of the added side data
749 * @param size size of the side data
750 *
751 * @return newly added side data on success, NULL on error
752 */
756
757 /**
758 * @return a pointer to the side data of a given type on success, NULL if there
759 * is no side data with such type in this frame.
760 */
763
764 /**
765 * If side data of the supplied type exists in the frame, free it and remove it
766 * from the frame.
767 */
769
770 /**
771 * @return a string identifying the side data type
772 */
774
775 /**
776 * @}
777 */
778
779 #endif /* AVUTIL_FRAME_H */