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22 * reference-counted frame API
25 #ifndef AVUTIL_FRAME_H
26 #define AVUTIL_FRAME_H
34 #include "samplefmt.h"
40 * @defgroup lavu_frame AVFrame
44 * AVFrame is an abstraction for reference-counted raw multimedia data.
47 enum AVFrameSideDataType {
49 * The data is the AVPanScan struct defined in libavcodec.
51 AV_FRAME_DATA_PANSCAN,
53 * ATSC A53 Part 4 Closed Captions.
54 * A53 CC bitstream is stored as uint8_t in AVFrameSideData.data.
55 * The number of bytes of CC data is AVFrameSideData.size.
59 * Stereoscopic 3d metadata.
60 * The data is the AVStereo3D struct defined in libavutil/stereo3d.h.
62 AV_FRAME_DATA_STEREO3D,
64 * The data is the AVMatrixEncoding enum defined in libavutil/channel_layout.h.
66 AV_FRAME_DATA_MATRIXENCODING,
68 * Metadata relevant to a downmix procedure.
69 * The data is the AVDownmixInfo struct defined in libavutil/downmix_info.h.
71 AV_FRAME_DATA_DOWNMIX_INFO,
73 * ReplayGain information in the form of the AVReplayGain struct.
75 AV_FRAME_DATA_REPLAYGAIN,
77 * This side data contains a 3x3 transformation matrix describing an affine
78 * transformation that needs to be applied to the frame for correct
81 * See libavutil/display.h for a detailed description of the data.
83 AV_FRAME_DATA_DISPLAYMATRIX,
85 * Active Format Description data consisting of a single byte as specified
86 * in ETSI TS 101 154 using AVActiveFormatDescription enum.
90 * Motion vectors exported by some codecs (on demand through the export_mvs
91 * flag set in the libavcodec AVCodecContext flags2 option).
92 * The data is the AVMotionVector struct defined in
93 * libavutil/motion_vector.h.
95 AV_FRAME_DATA_MOTION_VECTORS,
97 * Recommmends skipping the specified number of samples. This is exported
98 * only if the "skip_manual" AVOption is set in libavcodec.
99 * This has the same format as AV_PKT_DATA_SKIP_SAMPLES.
101 * u32le number of samples to skip from start of this packet
102 * u32le number of samples to skip from end of this packet
103 * u8 reason for start skip
104 * u8 reason for end skip (0=padding silence, 1=convergence)
107 AV_FRAME_DATA_SKIP_SAMPLES,
109 * This side data must be associated with an audio frame and corresponds to
110 * enum AVAudioServiceType defined in avcodec.h.
112 AV_FRAME_DATA_AUDIO_SERVICE_TYPE,
114 * Mastering display metadata associated with a video frame. The payload is
115 * an AVMasteringDisplayMetadata type and contains information about the
116 * mastering display color volume.
118 AV_FRAME_DATA_MASTERING_DISPLAY_METADATA,
120 * The GOP timecode in 25 bit timecode format. Data format is 64-bit integer.
121 * This is set on the first frame of a GOP that has a temporal reference of 0.
123 AV_FRAME_DATA_GOP_TIMECODE,
126 * The data represents the AVSphericalMapping structure defined in
127 * libavutil/spherical.h.
129 AV_FRAME_DATA_SPHERICAL,
132 enum AVActiveFormatDescription {
137 AV_AFD_4_3_SP_14_9 = 13,
138 AV_AFD_16_9_SP_14_9 = 14,
144 * Structure to hold side data for an AVFrame.
146 * sizeof(AVFrameSideData) is not a part of the public ABI, so new fields may be added
147 * to the end with a minor bump.
149 typedef struct AVFrameSideData {
150 enum AVFrameSideDataType type;
153 AVDictionary *metadata;
158 * This structure describes decoded (raw) audio or video data.
160 * AVFrame must be allocated using av_frame_alloc(). Note that this only
161 * allocates the AVFrame itself, the buffers for the data must be managed
162 * through other means (see below).
163 * AVFrame must be freed with av_frame_free().
165 * AVFrame is typically allocated once and then reused multiple times to hold
166 * different data (e.g. a single AVFrame to hold frames received from a
167 * decoder). In such a case, av_frame_unref() will free any references held by
168 * the frame and reset it to its original clean state before it
171 * The data described by an AVFrame is usually reference counted through the
172 * AVBuffer API. The underlying buffer references are stored in AVFrame.buf /
173 * AVFrame.extended_buf. An AVFrame is considered to be reference counted if at
174 * least one reference is set, i.e. if AVFrame.buf[0] != NULL. In such a case,
175 * every single data plane must be contained in one of the buffers in
176 * AVFrame.buf or AVFrame.extended_buf.
177 * There may be a single buffer for all the data, or one separate buffer for
178 * each plane, or anything in between.
180 * sizeof(AVFrame) is not a part of the public ABI, so new fields may be added
181 * to the end with a minor bump.
182 * Similarly fields that are marked as to be only accessed by
183 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
184 * without breaking compatibility with each other.
186 * Fields can be accessed through AVOptions, the name string used, matches the
187 * C structure field name for fields accessible through AVOptions. The AVClass
188 * for AVFrame can be obtained from avcodec_get_frame_class()
190 typedef struct AVFrame {
191 #define AV_NUM_DATA_POINTERS 8
193 * pointer to the picture/channel planes.
194 * This might be different from the first allocated byte
196 * Some decoders access areas outside 0,0 - width,height, please
197 * see avcodec_align_dimensions2(). Some filters and swscale can read
198 * up to 16 bytes beyond the planes, if these filters are to be used,
199 * then 16 extra bytes must be allocated.
201 * NOTE: Except for hwaccel formats, pointers not needed by the format
202 * MUST be set to NULL.
204 uint8_t *data[AV_NUM_DATA_POINTERS];
207 * For video, size in bytes of each picture line.
208 * For audio, size in bytes of each plane.
210 * For audio, only linesize[0] may be set. For planar audio, each channel
211 * plane must be the same size.
213 * For video the linesizes should be multiples of the CPUs alignment
214 * preference, this is 16 or 32 for modern desktop CPUs.
215 * Some code requires such alignment other code can be slower without
216 * correct alignment, for yet other it makes no difference.
218 * @note The linesize may be larger than the size of usable data -- there
219 * may be extra padding present for performance reasons.
221 int linesize[AV_NUM_DATA_POINTERS];
224 * pointers to the data planes/channels.
226 * For video, this should simply point to data[].
228 * For planar audio, each channel has a separate data pointer, and
229 * linesize[0] contains the size of each channel buffer.
230 * For packed audio, there is just one data pointer, and linesize[0]
231 * contains the total size of the buffer for all channels.
233 * Note: Both data and extended_data should always be set in a valid frame,
234 * but for planar audio with more channels that can fit in data,
235 * extended_data must be used in order to access all channels.
237 uint8_t **extended_data;
240 * width and height of the video frame
245 * number of audio samples (per channel) described by this frame
250 * format of the frame, -1 if unknown or unset
251 * Values correspond to enum AVPixelFormat for video frames,
252 * enum AVSampleFormat for audio)
257 * 1 -> keyframe, 0-> not
262 * Picture type of the frame.
264 enum AVPictureType pict_type;
267 * Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
269 AVRational sample_aspect_ratio;
272 * Presentation timestamp in time_base units (time when frame should be shown to user).
278 * PTS copied from the AVPacket that was decoded to produce this frame.
279 * @deprecated use the pts field instead
286 * DTS copied from the AVPacket that triggered returning this frame. (if frame threading isn't used)
287 * This is also the Presentation time of this AVFrame calculated from
288 * only AVPacket.dts values without pts values.
293 * picture number in bitstream order
295 int coded_picture_number;
297 * picture number in display order
299 int display_picture_number;
302 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
307 * for some private data of the user
311 #if FF_API_ERROR_FRAME
316 uint64_t error[AV_NUM_DATA_POINTERS];
320 * When decoding, this signals how much the picture must be delayed.
321 * extra_delay = repeat_pict / (2*fps)
326 * The content of the picture is interlaced.
328 int interlaced_frame;
331 * If the content is interlaced, is top field displayed first.
336 * Tell user application that palette has changed from previous frame.
338 int palette_has_changed;
341 * reordered opaque 64 bits (generally an integer or a double precision float
342 * PTS but can be anything).
343 * The user sets AVCodecContext.reordered_opaque to represent the input at
345 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
346 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
347 * @deprecated in favor of pkt_pts
349 int64_t reordered_opaque;
352 * Sample rate of the audio data.
357 * Channel layout of the audio data.
359 uint64_t channel_layout;
362 * AVBuffer references backing the data for this frame. If all elements of
363 * this array are NULL, then this frame is not reference counted. This array
364 * must be filled contiguously -- if buf[i] is non-NULL then buf[j] must
365 * also be non-NULL for all j < i.
367 * There may be at most one AVBuffer per data plane, so for video this array
368 * always contains all the references. For planar audio with more than
369 * AV_NUM_DATA_POINTERS channels, there may be more buffers than can fit in
370 * this array. Then the extra AVBufferRef pointers are stored in the
371 * extended_buf array.
373 AVBufferRef *buf[AV_NUM_DATA_POINTERS];
376 * For planar audio which requires more than AV_NUM_DATA_POINTERS
377 * AVBufferRef pointers, this array will hold all the references which
378 * cannot fit into AVFrame.buf.
380 * Note that this is different from AVFrame.extended_data, which always
381 * contains all the pointers. This array only contains the extra pointers,
382 * which cannot fit into AVFrame.buf.
384 * This array is always allocated using av_malloc() by whoever constructs
385 * the frame. It is freed in av_frame_unref().
387 AVBufferRef **extended_buf;
389 * Number of elements in extended_buf.
393 AVFrameSideData **side_data;
397 * @defgroup lavu_frame_flags AV_FRAME_FLAGS
398 * @ingroup lavu_frame
399 * Flags describing additional frame properties.
405 * The frame data may be corrupted, e.g. due to decoding errors.
407 #define AV_FRAME_FLAG_CORRUPT (1 << 0)
409 * A flag to mark the frames which need to be decoded, but shouldn't be output.
411 #define AV_FRAME_FLAG_DISCARD (1 << 2)
417 * Frame flags, a combination of @ref lavu_frame_flags
422 * MPEG vs JPEG YUV range.
423 * It must be accessed using av_frame_get_color_range() and
424 * av_frame_set_color_range().
425 * - encoding: Set by user
426 * - decoding: Set by libavcodec
428 enum AVColorRange color_range;
430 enum AVColorPrimaries color_primaries;
432 enum AVColorTransferCharacteristic color_trc;
435 * YUV colorspace type.
436 * It must be accessed using av_frame_get_colorspace() and
437 * av_frame_set_colorspace().
438 * - encoding: Set by user
439 * - decoding: Set by libavcodec
441 enum AVColorSpace colorspace;
443 enum AVChromaLocation chroma_location;
446 * frame timestamp estimated using various heuristics, in stream time base
447 * Code outside libavutil should access this field using:
448 * av_frame_get_best_effort_timestamp(frame)
450 * - decoding: set by libavcodec, read by user.
452 int64_t best_effort_timestamp;
455 * reordered pos from the last AVPacket that has been input into the decoder
456 * Code outside libavutil should access this field using:
457 * av_frame_get_pkt_pos(frame)
459 * - decoding: Read by user.
464 * duration of the corresponding packet, expressed in
465 * AVStream->time_base units, 0 if unknown.
466 * Code outside libavutil should access this field using:
467 * av_frame_get_pkt_duration(frame)
469 * - decoding: Read by user.
471 int64_t pkt_duration;
475 * Code outside libavutil should access this field using:
476 * av_frame_get_metadata(frame)
477 * - encoding: Set by user.
478 * - decoding: Set by libavcodec.
480 AVDictionary *metadata;
483 * decode error flags of the frame, set to a combination of
484 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
485 * were errors during the decoding.
486 * Code outside libavutil should access this field using:
487 * av_frame_get_decode_error_flags(frame)
489 * - decoding: set by libavcodec, read by user.
491 int decode_error_flags;
492 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
493 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
496 * number of audio channels, only used for audio.
497 * Code outside libavutil should access this field using:
498 * av_frame_get_channels(frame)
500 * - decoding: Read by user.
505 * size of the corresponding packet containing the compressed
506 * frame. It must be accessed using av_frame_get_pkt_size() and
507 * av_frame_set_pkt_size().
508 * It is set to a negative value if unknown.
510 * - decoding: set by libavcodec, read by user.
517 * Not to be accessed directly from outside libavutil
520 int8_t *qscale_table;
523 * Not to be accessed directly from outside libavutil
532 * Not to be accessed directly from outside libavutil
534 AVBufferRef *qp_table_buf;
537 * For hwaccel-format frames, this should be a reference to the
538 * AVHWFramesContext describing the frame.
540 AVBufferRef *hw_frames_ctx;
544 * Accessors for some AVFrame fields.
545 * The position of these field in the structure is not part of the ABI,
546 * they should not be accessed directly outside libavutil.
548 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
549 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
550 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
551 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
552 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
553 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
554 int64_t av_frame_get_channel_layout (const AVFrame *frame);
555 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
556 int av_frame_get_channels (const AVFrame *frame);
557 void av_frame_set_channels (AVFrame *frame, int val);
558 int av_frame_get_sample_rate (const AVFrame *frame);
559 void av_frame_set_sample_rate (AVFrame *frame, int val);
560 AVDictionary *av_frame_get_metadata (const AVFrame *frame);
561 void av_frame_set_metadata (AVFrame *frame, AVDictionary *val);
562 int av_frame_get_decode_error_flags (const AVFrame *frame);
563 void av_frame_set_decode_error_flags (AVFrame *frame, int val);
564 int av_frame_get_pkt_size(const AVFrame *frame);
565 void av_frame_set_pkt_size(AVFrame *frame, int val);
566 AVDictionary **avpriv_frame_get_metadatap(AVFrame *frame);
568 int8_t *av_frame_get_qp_table(AVFrame *f, int *stride, int *type);
569 int av_frame_set_qp_table(AVFrame *f, AVBufferRef *buf, int stride, int type);
571 enum AVColorSpace av_frame_get_colorspace(const AVFrame *frame);
572 void av_frame_set_colorspace(AVFrame *frame, enum AVColorSpace val);
573 enum AVColorRange av_frame_get_color_range(const AVFrame *frame);
574 void av_frame_set_color_range(AVFrame *frame, enum AVColorRange val);
577 * Get the name of a colorspace.
578 * @return a static string identifying the colorspace; can be NULL.
580 const char *av_get_colorspace_name(enum AVColorSpace val);
583 * Allocate an AVFrame and set its fields to default values. The resulting
584 * struct must be freed using av_frame_free().
586 * @return An AVFrame filled with default values or NULL on failure.
588 * @note this only allocates the AVFrame itself, not the data buffers. Those
589 * must be allocated through other means, e.g. with av_frame_get_buffer() or
592 AVFrame *av_frame_alloc(void);
595 * Free the frame and any dynamically allocated objects in it,
596 * e.g. extended_data. If the frame is reference counted, it will be
597 * unreferenced first.
599 * @param frame frame to be freed. The pointer will be set to NULL.
601 void av_frame_free(AVFrame **frame);
604 * Set up a new reference to the data described by the source frame.
606 * Copy frame properties from src to dst and create a new reference for each
607 * AVBufferRef from src.
609 * If src is not reference counted, new buffers are allocated and the data is
612 * @warning: dst MUST have been either unreferenced with av_frame_unref(dst),
613 * or newly allocated with av_frame_alloc() before calling this
614 * function, or undefined behavior will occur.
616 * @return 0 on success, a negative AVERROR on error
618 int av_frame_ref(AVFrame *dst, const AVFrame *src);
621 * Create a new frame that references the same data as src.
623 * This is a shortcut for av_frame_alloc()+av_frame_ref().
625 * @return newly created AVFrame on success, NULL on error.
627 AVFrame *av_frame_clone(const AVFrame *src);
630 * Unreference all the buffers referenced by frame and reset the frame fields.
632 void av_frame_unref(AVFrame *frame);
635 * Move everything contained in src to dst and reset src.
637 * @warning: dst is not unreferenced, but directly overwritten without reading
638 * or deallocating its contents. Call av_frame_unref(dst) manually
639 * before calling this function to ensure that no memory is leaked.
641 void av_frame_move_ref(AVFrame *dst, AVFrame *src);
644 * Allocate new buffer(s) for audio or video data.
646 * The following fields must be set on frame before calling this function:
647 * - format (pixel format for video, sample format for audio)
648 * - width and height for video
649 * - nb_samples and channel_layout for audio
651 * This function will fill AVFrame.data and AVFrame.buf arrays and, if
652 * necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
653 * For planar formats, one buffer will be allocated for each plane.
655 * @warning: if frame already has been allocated, calling this function will
656 * leak memory. In addition, undefined behavior can occur in certain
659 * @param frame frame in which to store the new buffers.
660 * @param align required buffer size alignment
662 * @return 0 on success, a negative AVERROR on error.
664 int av_frame_get_buffer(AVFrame *frame, int align);
667 * Check if the frame data is writable.
669 * @return A positive value if the frame data is writable (which is true if and
670 * only if each of the underlying buffers has only one reference, namely the one
671 * stored in this frame). Return 0 otherwise.
673 * If 1 is returned the answer is valid until av_buffer_ref() is called on any
674 * of the underlying AVBufferRefs (e.g. through av_frame_ref() or directly).
676 * @see av_frame_make_writable(), av_buffer_is_writable()
678 int av_frame_is_writable(AVFrame *frame);
681 * Ensure that the frame data is writable, avoiding data copy if possible.
683 * Do nothing if the frame is writable, allocate new buffers and copy the data
686 * @return 0 on success, a negative AVERROR on error.
688 * @see av_frame_is_writable(), av_buffer_is_writable(),
689 * av_buffer_make_writable()
691 int av_frame_make_writable(AVFrame *frame);
694 * Copy the frame data from src to dst.
696 * This function does not allocate anything, dst must be already initialized and
697 * allocated with the same parameters as src.
699 * This function only copies the frame data (i.e. the contents of the data /
700 * extended data arrays), not any other properties.
702 * @return >= 0 on success, a negative AVERROR on error.
704 int av_frame_copy(AVFrame *dst, const AVFrame *src);
707 * Copy only "metadata" fields from src to dst.
709 * Metadata for the purpose of this function are those fields that do not affect
710 * the data layout in the buffers. E.g. pts, sample rate (for audio) or sample
711 * aspect ratio (for video), but not width/height or channel layout.
712 * Side data is also copied.
714 int av_frame_copy_props(AVFrame *dst, const AVFrame *src);
717 * Get the buffer reference a given data plane is stored in.
719 * @param plane index of the data plane of interest in frame->extended_data.
721 * @return the buffer reference that contains the plane or NULL if the input
722 * frame is not valid.
724 AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane);
727 * Add a new side data to a frame.
729 * @param frame a frame to which the side data should be added
730 * @param type type of the added side data
731 * @param size size of the side data
733 * @return newly added side data on success, NULL on error
735 AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
736 enum AVFrameSideDataType type,
740 * @return a pointer to the side data of a given type on success, NULL if there
741 * is no side data with such type in this frame.
743 AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
744 enum AVFrameSideDataType type);
747 * If side data of the supplied type exists in the frame, free it and remove it
750 void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type);
753 * @return a string identifying the side data type
755 const char *av_frame_side_data_name(enum AVFrameSideDataType type);
761 #endif /* AVUTIL_FRAME_H */