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12 * Lesser General Public License for more details.
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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
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 enum AVActiveFormatDescription {
131 AV_AFD_4_3_SP_14_9 = 13,
132 AV_AFD_16_9_SP_14_9 = 14,
138 * Structure to hold side data for an AVFrame.
140 * sizeof(AVFrameSideData) is not a part of the public ABI, so new fields may be added
141 * to the end with a minor bump.
143 typedef struct AVFrameSideData {
144 enum AVFrameSideDataType type;
147 AVDictionary *metadata;
152 * This structure describes decoded (raw) audio or video data.
154 * AVFrame must be allocated using av_frame_alloc(). Note that this only
155 * allocates the AVFrame itself, the buffers for the data must be managed
156 * through other means (see below).
157 * AVFrame must be freed with av_frame_free().
159 * AVFrame is typically allocated once and then reused multiple times to hold
160 * different data (e.g. a single AVFrame to hold frames received from a
161 * decoder). In such a case, av_frame_unref() will free any references held by
162 * the frame and reset it to its original clean state before it
165 * The data described by an AVFrame is usually reference counted through the
166 * AVBuffer API. The underlying buffer references are stored in AVFrame.buf /
167 * AVFrame.extended_buf. An AVFrame is considered to be reference counted if at
168 * least one reference is set, i.e. if AVFrame.buf[0] != NULL. In such a case,
169 * every single data plane must be contained in one of the buffers in
170 * AVFrame.buf or AVFrame.extended_buf.
171 * There may be a single buffer for all the data, or one separate buffer for
172 * each plane, or anything in between.
174 * sizeof(AVFrame) is not a part of the public ABI, so new fields may be added
175 * to the end with a minor bump.
176 * Similarly fields that are marked as to be only accessed by
177 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
178 * without breaking compatibility with each other.
180 typedef struct AVFrame {
181 #define AV_NUM_DATA_POINTERS 8
183 * pointer to the picture/channel planes.
184 * This might be different from the first allocated byte
186 * Some decoders access areas outside 0,0 - width,height, please
187 * see avcodec_align_dimensions2(). Some filters and swscale can read
188 * up to 16 bytes beyond the planes, if these filters are to be used,
189 * then 16 extra bytes must be allocated.
191 uint8_t *data[AV_NUM_DATA_POINTERS];
194 * For video, size in bytes of each picture line.
195 * For audio, size in bytes of each plane.
197 * For audio, only linesize[0] may be set. For planar audio, each channel
198 * plane must be the same size.
200 * For video the linesizes should be multiples of the CPUs alignment
201 * preference, this is 16 or 32 for modern desktop CPUs.
202 * Some code requires such alignment other code can be slower without
203 * correct alignment, for yet other it makes no difference.
205 * @note The linesize may be larger than the size of usable data -- there
206 * may be extra padding present for performance reasons.
208 int linesize[AV_NUM_DATA_POINTERS];
211 * pointers to the data planes/channels.
213 * For video, this should simply point to data[].
215 * For planar audio, each channel has a separate data pointer, and
216 * linesize[0] contains the size of each channel buffer.
217 * For packed audio, there is just one data pointer, and linesize[0]
218 * contains the total size of the buffer for all channels.
220 * Note: Both data and extended_data should always be set in a valid frame,
221 * but for planar audio with more channels that can fit in data,
222 * extended_data must be used in order to access all channels.
224 uint8_t **extended_data;
227 * width and height of the video frame
232 * number of audio samples (per channel) described by this frame
237 * format of the frame, -1 if unknown or unset
238 * Values correspond to enum AVPixelFormat for video frames,
239 * enum AVSampleFormat for audio)
244 * 1 -> keyframe, 0-> not
249 * Picture type of the frame.
251 enum AVPictureType pict_type;
254 * Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
256 AVRational sample_aspect_ratio;
259 * Presentation timestamp in time_base units (time when frame should be shown to user).
264 * PTS copied from the AVPacket that was decoded to produce this frame.
269 * DTS copied from the AVPacket that triggered returning this frame. (if frame threading isn't used)
270 * This is also the Presentation time of this AVFrame calculated from
271 * only AVPacket.dts values without pts values.
276 * picture number in bitstream order
278 int coded_picture_number;
280 * picture number in display order
282 int display_picture_number;
285 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
290 * for some private data of the user
294 #if FF_API_ERROR_FRAME
299 uint64_t error[AV_NUM_DATA_POINTERS];
303 * When decoding, this signals how much the picture must be delayed.
304 * extra_delay = repeat_pict / (2*fps)
309 * The content of the picture is interlaced.
311 int interlaced_frame;
314 * If the content is interlaced, is top field displayed first.
319 * Tell user application that palette has changed from previous frame.
321 int palette_has_changed;
324 * reordered opaque 64bit (generally an integer or a double precision float
325 * PTS but can be anything).
326 * The user sets AVCodecContext.reordered_opaque to represent the input at
328 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
329 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
330 * @deprecated in favor of pkt_pts
332 int64_t reordered_opaque;
335 * Sample rate of the audio data.
340 * Channel layout of the audio data.
342 uint64_t channel_layout;
345 * AVBuffer references backing the data for this frame. If all elements of
346 * this array are NULL, then this frame is not reference counted. This array
347 * must be filled contiguously -- if buf[i] is non-NULL then buf[j] must
348 * also be non-NULL for all j < i.
350 * There may be at most one AVBuffer per data plane, so for video this array
351 * always contains all the references. For planar audio with more than
352 * AV_NUM_DATA_POINTERS channels, there may be more buffers than can fit in
353 * this array. Then the extra AVBufferRef pointers are stored in the
354 * extended_buf array.
356 AVBufferRef *buf[AV_NUM_DATA_POINTERS];
359 * For planar audio which requires more than AV_NUM_DATA_POINTERS
360 * AVBufferRef pointers, this array will hold all the references which
361 * cannot fit into AVFrame.buf.
363 * Note that this is different from AVFrame.extended_data, which always
364 * contains all the pointers. This array only contains the extra pointers,
365 * which cannot fit into AVFrame.buf.
367 * This array is always allocated using av_malloc() by whoever constructs
368 * the frame. It is freed in av_frame_unref().
370 AVBufferRef **extended_buf;
372 * Number of elements in extended_buf.
376 AVFrameSideData **side_data;
380 * @defgroup lavu_frame_flags AV_FRAME_FLAGS
381 * Flags describing additional frame properties.
387 * The frame data may be corrupted, e.g. due to decoding errors.
389 #define AV_FRAME_FLAG_CORRUPT (1 << 0)
395 * Frame flags, a combination of @ref lavu_frame_flags
400 * MPEG vs JPEG YUV range.
401 * It must be accessed using av_frame_get_color_range() and
402 * av_frame_set_color_range().
403 * - encoding: Set by user
404 * - decoding: Set by libavcodec
406 enum AVColorRange color_range;
408 enum AVColorPrimaries color_primaries;
410 enum AVColorTransferCharacteristic color_trc;
413 * YUV colorspace type.
414 * It must be accessed using av_frame_get_colorspace() and
415 * av_frame_set_colorspace().
416 * - encoding: Set by user
417 * - decoding: Set by libavcodec
419 enum AVColorSpace colorspace;
421 enum AVChromaLocation chroma_location;
424 * For hwaccel-format frames, this should be a reference to the
425 * AVHWFramesContext describing the frame.
427 AVBufferRef *hw_frames_ctx;
430 * frame timestamp estimated using various heuristics, in stream time base
431 * Code outside libavutil should access this field using:
432 * av_frame_get_best_effort_timestamp(frame)
434 * - decoding: set by libavcodec, read by user.
436 int64_t best_effort_timestamp;
439 * reordered pos from the last AVPacket that has been input into the decoder
440 * Code outside libavutil should access this field using:
441 * av_frame_get_pkt_pos(frame)
443 * - decoding: Read by user.
448 * duration of the corresponding packet, expressed in
449 * AVStream->time_base units, 0 if unknown.
450 * Code outside libavutil should access this field using:
451 * av_frame_get_pkt_duration(frame)
453 * - decoding: Read by user.
455 int64_t pkt_duration;
459 * Code outside libavutil should access this field using:
460 * av_frame_get_metadata(frame)
461 * - encoding: Set by user.
462 * - decoding: Set by libavcodec.
464 AVDictionary *metadata;
467 * decode error flags of the frame, set to a combination of
468 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
469 * were errors during the decoding.
470 * Code outside libavutil should access this field using:
471 * av_frame_get_decode_error_flags(frame)
473 * - decoding: set by libavcodec, read by user.
475 int decode_error_flags;
476 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
477 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
480 * number of audio channels, only used for audio.
481 * Code outside libavutil should access this field using:
482 * av_frame_get_channels(frame)
484 * - decoding: Read by user.
489 * size of the corresponding packet containing the compressed
490 * frame. It must be accessed using av_frame_get_pkt_size() and
491 * av_frame_set_pkt_size().
492 * It is set to a negative value if unknown.
494 * - decoding: set by libavcodec, read by user.
501 * Not to be accessed directly from outside libavutil
504 int8_t *qscale_table;
507 * Not to be accessed directly from outside libavutil
516 * Not to be accessed directly from outside libavutil
518 AVBufferRef *qp_table_buf;
523 * Accessors for some AVFrame fields.
524 * The position of these field in the structure is not part of the ABI,
525 * they should not be accessed directly outside libavutil.
527 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
528 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
529 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
530 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
531 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
532 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
533 int64_t av_frame_get_channel_layout (const AVFrame *frame);
534 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
535 int av_frame_get_channels (const AVFrame *frame);
536 void av_frame_set_channels (AVFrame *frame, int val);
537 int av_frame_get_sample_rate (const AVFrame *frame);
538 void av_frame_set_sample_rate (AVFrame *frame, int val);
539 AVDictionary *av_frame_get_metadata (const AVFrame *frame);
540 void av_frame_set_metadata (AVFrame *frame, AVDictionary *val);
541 int av_frame_get_decode_error_flags (const AVFrame *frame);
542 void av_frame_set_decode_error_flags (AVFrame *frame, int val);
543 int av_frame_get_pkt_size(const AVFrame *frame);
544 void av_frame_set_pkt_size(AVFrame *frame, int val);
545 AVDictionary **avpriv_frame_get_metadatap(AVFrame *frame);
547 int8_t *av_frame_get_qp_table(AVFrame *f, int *stride, int *type);
548 int av_frame_set_qp_table(AVFrame *f, AVBufferRef *buf, int stride, int type);
550 enum AVColorSpace av_frame_get_colorspace(const AVFrame *frame);
551 void av_frame_set_colorspace(AVFrame *frame, enum AVColorSpace val);
552 enum AVColorRange av_frame_get_color_range(const AVFrame *frame);
553 void av_frame_set_color_range(AVFrame *frame, enum AVColorRange val);
556 * Get the name of a colorspace.
557 * @return a static string identifying the colorspace; can be NULL.
559 const char *av_get_colorspace_name(enum AVColorSpace val);
562 * Allocate an AVFrame and set its fields to default values. The resulting
563 * struct must be freed using av_frame_free().
565 * @return An AVFrame filled with default values or NULL on failure.
567 * @note this only allocates the AVFrame itself, not the data buffers. Those
568 * must be allocated through other means, e.g. with av_frame_get_buffer() or
571 AVFrame *av_frame_alloc(void);
574 * Free the frame and any dynamically allocated objects in it,
575 * e.g. extended_data. If the frame is reference counted, it will be
576 * unreferenced first.
578 * @param frame frame to be freed. The pointer will be set to NULL.
580 void av_frame_free(AVFrame **frame);
583 * Set up a new reference to the data described by the source frame.
585 * Copy frame properties from src to dst and create a new reference for each
586 * AVBufferRef from src.
588 * If src is not reference counted, new buffers are allocated and the data is
591 * @return 0 on success, a negative AVERROR on error
593 int av_frame_ref(AVFrame *dst, const AVFrame *src);
596 * Create a new frame that references the same data as src.
598 * This is a shortcut for av_frame_alloc()+av_frame_ref().
600 * @return newly created AVFrame on success, NULL on error.
602 AVFrame *av_frame_clone(const AVFrame *src);
605 * Unreference all the buffers referenced by frame and reset the frame fields.
607 void av_frame_unref(AVFrame *frame);
610 * Move everything contained in src to dst and reset src.
612 void av_frame_move_ref(AVFrame *dst, AVFrame *src);
615 * Allocate new buffer(s) for audio or video data.
617 * The following fields must be set on frame before calling this function:
618 * - format (pixel format for video, sample format for audio)
619 * - width and height for video
620 * - nb_samples and channel_layout for audio
622 * This function will fill AVFrame.data and AVFrame.buf arrays and, if
623 * necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
624 * For planar formats, one buffer will be allocated for each plane.
626 * @param frame frame in which to store the new buffers.
627 * @param align required buffer size alignment
629 * @return 0 on success, a negative AVERROR on error.
631 int av_frame_get_buffer(AVFrame *frame, int align);
634 * Check if the frame data is writable.
636 * @return A positive value if the frame data is writable (which is true if and
637 * only if each of the underlying buffers has only one reference, namely the one
638 * stored in this frame). Return 0 otherwise.
640 * If 1 is returned the answer is valid until av_buffer_ref() is called on any
641 * of the underlying AVBufferRefs (e.g. through av_frame_ref() or directly).
643 * @see av_frame_make_writable(), av_buffer_is_writable()
645 int av_frame_is_writable(AVFrame *frame);
648 * Ensure that the frame data is writable, avoiding data copy if possible.
650 * Do nothing if the frame is writable, allocate new buffers and copy the data
653 * @return 0 on success, a negative AVERROR on error.
655 * @see av_frame_is_writable(), av_buffer_is_writable(),
656 * av_buffer_make_writable()
658 int av_frame_make_writable(AVFrame *frame);
661 * Copy the frame data from src to dst.
663 * This function does not allocate anything, dst must be already initialized and
664 * allocated with the same parameters as src.
666 * This function only copies the frame data (i.e. the contents of the data /
667 * extended data arrays), not any other properties.
669 * @return >= 0 on success, a negative AVERROR on error.
671 int av_frame_copy(AVFrame *dst, const AVFrame *src);
674 * Copy only "metadata" fields from src to dst.
676 * Metadata for the purpose of this function are those fields that do not affect
677 * the data layout in the buffers. E.g. pts, sample rate (for audio) or sample
678 * aspect ratio (for video), but not width/height or channel layout.
679 * Side data is also copied.
681 int av_frame_copy_props(AVFrame *dst, const AVFrame *src);
684 * Get the buffer reference a given data plane is stored in.
686 * @param plane index of the data plane of interest in frame->extended_data.
688 * @return the buffer reference that contains the plane or NULL if the input
689 * frame is not valid.
691 AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane);
694 * Add a new side data to a frame.
696 * @param frame a frame to which the side data should be added
697 * @param type type of the added side data
698 * @param size size of the side data
700 * @return newly added side data on success, NULL on error
702 AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
703 enum AVFrameSideDataType type,
707 * @return a pointer to the side data of a given type on success, NULL if there
708 * is no side data with such type in this frame.
710 AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
711 enum AVFrameSideDataType type);
714 * If side data of the supplied type exists in the frame, free it and remove it
717 void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type);
720 * @return a string identifying the side data type
722 const char *av_frame_side_data_name(enum AVFrameSideDataType type);
728 #endif /* AVUTIL_FRAME_H */