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17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * reference-counted frame API
26 #ifndef AVUTIL_FRAME_H
27 #define AVUTIL_FRAME_H
35 #include "samplefmt.h"
41 * @defgroup lavu_frame AVFrame
45 * AVFrame is an abstraction for reference-counted raw multimedia data.
48 enum AVFrameSideDataType {
50 * The data is the AVPanScan struct defined in libavcodec.
52 AV_FRAME_DATA_PANSCAN,
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.
60 * Stereoscopic 3d metadata.
61 * The data is the AVStereo3D struct defined in libavutil/stereo3d.h.
63 AV_FRAME_DATA_STEREO3D,
65 * The data is the AVMatrixEncoding enum defined in libavutil/channel_layout.h.
67 AV_FRAME_DATA_MATRIXENCODING,
69 * Metadata relevant to a downmix procedure.
70 * The data is the AVDownmixInfo struct defined in libavutil/downmix_info.h.
72 AV_FRAME_DATA_DOWNMIX_INFO,
74 * ReplayGain information in the form of the AVReplayGain struct.
76 AV_FRAME_DATA_REPLAYGAIN,
78 * This side data contains a 3x3 transformation matrix describing an affine
79 * transformation that needs to be applied to the frame for correct
82 * See libavutil/display.h for a detailed description of the data.
84 AV_FRAME_DATA_DISPLAYMATRIX,
86 * Active Format Description data consisting of a single byte as specified
87 * in ETSI TS 101 154 using AVActiveFormatDescription enum.
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.
96 AV_FRAME_DATA_MOTION_VECTORS,
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.
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)
108 AV_FRAME_DATA_SKIP_SAMPLES,
111 * This side data must be associated with an audio frame and corresponds to
112 * enum AVAudioServiceType defined in avcodec.h.
114 AV_FRAME_DATA_AUDIO_SERVICE_TYPE,
117 enum AVActiveFormatDescription {
122 AV_AFD_4_3_SP_14_9 = 13,
123 AV_AFD_16_9_SP_14_9 = 14,
127 typedef struct AVFrameSideData {
128 enum AVFrameSideDataType type;
131 AVDictionary *metadata;
135 * This structure describes decoded (raw) audio or video data.
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().
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
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.
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.
163 typedef struct AVFrame {
164 #define AV_NUM_DATA_POINTERS 8
166 * pointer to the picture/channel planes.
167 * This might be different from the first allocated byte
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.
174 uint8_t *data[AV_NUM_DATA_POINTERS];
177 * For video, size in bytes of each picture line.
178 * For audio, size in bytes of each plane.
180 * For audio, only linesize[0] may be set. For planar audio, each channel
181 * plane must be the same size.
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.
188 * @note The linesize may be larger than the size of usable data -- there
189 * may be extra padding present for performance reasons.
191 int linesize[AV_NUM_DATA_POINTERS];
194 * pointers to the data planes/channels.
196 * For video, this should simply point to data[].
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.
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.
207 uint8_t **extended_data;
210 * width and height of the video frame
215 * number of audio samples (per channel) described by this frame
220 * format of the frame, -1 if unknown or unset
221 * Values correspond to enum AVPixelFormat for video frames,
222 * enum AVSampleFormat for audio)
227 * 1 -> keyframe, 0-> not
232 * Picture type of the frame.
234 enum AVPictureType pict_type;
236 #if FF_API_AVFRAME_LAVC
238 uint8_t *base[AV_NUM_DATA_POINTERS];
242 * Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
244 AVRational sample_aspect_ratio;
247 * Presentation timestamp in time_base units (time when frame should be shown to user).
252 * PTS copied from the AVPacket that was decoded to produce this frame.
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.
264 * picture number in bitstream order
266 int coded_picture_number;
268 * picture number in display order
270 int display_picture_number;
273 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
277 #if FF_API_AVFRAME_LAVC
285 int8_t *qscale_table;
296 * mbskip_table[mb]>=1 if MB didn't change
297 * stride= mb_width = (width+15)>>4
300 uint8_t *mbskip_table;
303 * motion vector table
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];
312 int16_t (*motion_val[2])[2];
315 * macroblock type table
316 * mb_type_base + mb_width + 2
328 * motion reference frame index
329 * the order in which these are stored can depend on the codec.
332 int8_t *ref_index[2];
336 * for some private data of the user
343 uint64_t error[AV_NUM_DATA_POINTERS];
345 #if FF_API_AVFRAME_LAVC
351 * When decoding, this signals how much the picture must be delayed.
352 * extra_delay = repeat_pict / (2*fps)
357 * The content of the picture is interlaced.
359 int interlaced_frame;
362 * If the content is interlaced, is top field displayed first.
367 * Tell user application that palette has changed from previous frame.
369 int palette_has_changed;
371 #if FF_API_AVFRAME_LAVC
379 struct AVPanScan *pan_scan;
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
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
391 int64_t reordered_opaque;
393 #if FF_API_AVFRAME_LAVC
395 * @deprecated this field is unused
397 attribute_deprecated void *hwaccel_picture_private;
400 struct AVCodecContext *owner;
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)
408 uint8_t motion_subsample_log2;
412 * Sample rate of the audio data.
417 * Channel layout of the audio data.
419 uint64_t channel_layout;
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.
425 * There may be at most one AVBuffer per data plane, so for video this array
426 * always contains all the references. For planar audio with more than
427 * AV_NUM_DATA_POINTERS channels, there may be more buffers than can fit in
428 * this array. Then the extra AVBufferRef pointers are stored in the
429 * extended_buf array.
431 AVBufferRef *buf[AV_NUM_DATA_POINTERS];
434 * For planar audio which requires more than AV_NUM_DATA_POINTERS
435 * AVBufferRef pointers, this array will hold all the references which
436 * cannot fit into AVFrame.buf.
438 * Note that this is different from AVFrame.extended_data, which always
439 * contains all the pointers. This array only contains the extra pointers,
440 * which cannot fit into AVFrame.buf.
442 * This array is always allocated using av_malloc() by whoever constructs
443 * the frame. It is freed in av_frame_unref().
445 AVBufferRef **extended_buf;
447 * Number of elements in extended_buf.
451 AVFrameSideData **side_data;
455 * @defgroup lavu_frame_flags AV_FRAME_FLAGS
456 * Flags describing additional frame properties.
462 * The frame data may be corrupted, e.g. due to decoding errors.
464 #define AV_FRAME_FLAG_CORRUPT (1 << 0)
470 * Frame flags, a combination of @ref lavu_frame_flags
475 * MPEG vs JPEG YUV range.
476 * It must be accessed using av_frame_get_color_range() and
477 * av_frame_set_color_range().
478 * - encoding: Set by user
479 * - decoding: Set by libavcodec
481 enum AVColorRange color_range;
483 enum AVColorPrimaries color_primaries;
485 enum AVColorTransferCharacteristic color_trc;
488 * YUV colorspace type.
489 * It must be accessed using av_frame_get_colorspace() and
490 * av_frame_set_colorspace().
491 * - encoding: Set by user
492 * - decoding: Set by libavcodec
494 enum AVColorSpace colorspace;
496 enum AVChromaLocation chroma_location;
499 * frame timestamp estimated using various heuristics, in stream time base
500 * Code outside libavcodec should access this field using:
501 * av_frame_get_best_effort_timestamp(frame)
503 * - decoding: set by libavcodec, read by user.
505 int64_t best_effort_timestamp;
508 * reordered pos from the last AVPacket that has been input into the decoder
509 * Code outside libavcodec should access this field using:
510 * av_frame_get_pkt_pos(frame)
512 * - decoding: Read by user.
517 * duration of the corresponding packet, expressed in
518 * AVStream->time_base units, 0 if unknown.
519 * Code outside libavcodec should access this field using:
520 * av_frame_get_pkt_duration(frame)
522 * - decoding: Read by user.
524 int64_t pkt_duration;
528 * Code outside libavcodec should access this field using:
529 * av_frame_get_metadata(frame)
530 * - encoding: Set by user.
531 * - decoding: Set by libavcodec.
533 AVDictionary *metadata;
536 * decode error flags of the frame, set to a combination of
537 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
538 * were errors during the decoding.
539 * Code outside libavcodec should access this field using:
540 * av_frame_get_decode_error_flags(frame)
542 * - decoding: set by libavcodec, read by user.
544 int decode_error_flags;
545 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
546 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
549 * number of audio channels, only used for audio.
550 * Code outside libavcodec should access this field using:
551 * av_frame_get_channels(frame)
553 * - decoding: Read by user.
558 * size of the corresponding packet containing the compressed
559 * frame. It must be accessed using av_frame_get_pkt_size() and
560 * av_frame_set_pkt_size().
561 * It is set to a negative value if unknown.
563 * - decoding: set by libavcodec, read by user.
568 * Not to be accessed directly from outside libavutil
570 AVBufferRef *qp_table_buf;
574 * Accessors for some AVFrame fields.
575 * The position of these field in the structure is not part of the ABI,
576 * they should not be accessed directly outside libavcodec.
578 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
579 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
580 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
581 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
582 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
583 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
584 int64_t av_frame_get_channel_layout (const AVFrame *frame);
585 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
586 int av_frame_get_channels (const AVFrame *frame);
587 void av_frame_set_channels (AVFrame *frame, int val);
588 int av_frame_get_sample_rate (const AVFrame *frame);
589 void av_frame_set_sample_rate (AVFrame *frame, int val);
590 AVDictionary *av_frame_get_metadata (const AVFrame *frame);
591 void av_frame_set_metadata (AVFrame *frame, AVDictionary *val);
592 int av_frame_get_decode_error_flags (const AVFrame *frame);
593 void av_frame_set_decode_error_flags (AVFrame *frame, int val);
594 int av_frame_get_pkt_size(const AVFrame *frame);
595 void av_frame_set_pkt_size(AVFrame *frame, int val);
596 AVDictionary **avpriv_frame_get_metadatap(AVFrame *frame);
597 int8_t *av_frame_get_qp_table(AVFrame *f, int *stride, int *type);
598 int av_frame_set_qp_table(AVFrame *f, AVBufferRef *buf, int stride, int type);
599 enum AVColorSpace av_frame_get_colorspace(const AVFrame *frame);
600 void av_frame_set_colorspace(AVFrame *frame, enum AVColorSpace val);
601 enum AVColorRange av_frame_get_color_range(const AVFrame *frame);
602 void av_frame_set_color_range(AVFrame *frame, enum AVColorRange val);
605 * Get the name of a colorspace.
606 * @return a static string identifying the colorspace; can be NULL.
608 const char *av_get_colorspace_name(enum AVColorSpace val);
611 * Allocate an AVFrame and set its fields to default values. The resulting
612 * struct must be freed using av_frame_free().
614 * @return An AVFrame filled with default values or NULL on failure.
616 * @note this only allocates the AVFrame itself, not the data buffers. Those
617 * must be allocated through other means, e.g. with av_frame_get_buffer() or
620 AVFrame *av_frame_alloc(void);
623 * Free the frame and any dynamically allocated objects in it,
624 * e.g. extended_data. If the frame is reference counted, it will be
625 * unreferenced first.
627 * @param frame frame to be freed. The pointer will be set to NULL.
629 void av_frame_free(AVFrame **frame);
632 * Set up a new reference to the data described by the source frame.
634 * Copy frame properties from src to dst and create a new reference for each
635 * AVBufferRef from src.
637 * If src is not reference counted, new buffers are allocated and the data is
640 * @return 0 on success, a negative AVERROR on error
642 int av_frame_ref(AVFrame *dst, const AVFrame *src);
645 * Create a new frame that references the same data as src.
647 * This is a shortcut for av_frame_alloc()+av_frame_ref().
649 * @return newly created AVFrame on success, NULL on error.
651 AVFrame *av_frame_clone(const AVFrame *src);
654 * Unreference all the buffers referenced by frame and reset the frame fields.
656 void av_frame_unref(AVFrame *frame);
659 * Move everythnig contained in src to dst and reset src.
661 void av_frame_move_ref(AVFrame *dst, AVFrame *src);
664 * Allocate new buffer(s) for audio or video data.
666 * The following fields must be set on frame before calling this function:
667 * - format (pixel format for video, sample format for audio)
668 * - width and height for video
669 * - nb_samples and channel_layout for audio
671 * This function will fill AVFrame.data and AVFrame.buf arrays and, if
672 * necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
673 * For planar formats, one buffer will be allocated for each plane.
675 * @param frame frame in which to store the new buffers.
676 * @param align required buffer size alignment
678 * @return 0 on success, a negative AVERROR on error.
680 int av_frame_get_buffer(AVFrame *frame, int align);
683 * Check if the frame data is writable.
685 * @return A positive value if the frame data is writable (which is true if and
686 * only if each of the underlying buffers has only one reference, namely the one
687 * stored in this frame). Return 0 otherwise.
689 * If 1 is returned the answer is valid until av_buffer_ref() is called on any
690 * of the underlying AVBufferRefs (e.g. through av_frame_ref() or directly).
692 * @see av_frame_make_writable(), av_buffer_is_writable()
694 int av_frame_is_writable(AVFrame *frame);
697 * Ensure that the frame data is writable, avoiding data copy if possible.
699 * Do nothing if the frame is writable, allocate new buffers and copy the data
702 * @return 0 on success, a negative AVERROR on error.
704 * @see av_frame_is_writable(), av_buffer_is_writable(),
705 * av_buffer_make_writable()
707 int av_frame_make_writable(AVFrame *frame);
710 * Copy the frame data from src to dst.
712 * This function does not allocate anything, dst must be already initialized and
713 * allocated with the same parameters as src.
715 * This function only copies the frame data (i.e. the contents of the data /
716 * extended data arrays), not any other properties.
718 * @return >= 0 on success, a negative AVERROR on error.
720 int av_frame_copy(AVFrame *dst, const AVFrame *src);
723 * Copy only "metadata" fields from src to dst.
725 * Metadata for the purpose of this function are those fields that do not affect
726 * the data layout in the buffers. E.g. pts, sample rate (for audio) or sample
727 * aspect ratio (for video), but not width/height or channel layout.
728 * Side data is also copied.
730 int av_frame_copy_props(AVFrame *dst, const AVFrame *src);
733 * Get the buffer reference a given data plane is stored in.
735 * @param plane index of the data plane of interest in frame->extended_data.
737 * @return the buffer reference that contains the plane or NULL if the input
738 * frame is not valid.
740 AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane);
743 * Add a new side data to a frame.
745 * @param frame a frame to which the side data should be added
746 * @param type type of the added side data
747 * @param size size of the side data
749 * @return newly added side data on success, NULL on error
751 AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
752 enum AVFrameSideDataType type,
756 * @return a pointer to the side data of a given type on success, NULL if there
757 * is no side data with such type in this frame.
759 AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
760 enum AVFrameSideDataType type);
763 * If side data of the supplied type exists in the frame, free it and remove it
766 void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type);
769 * @return a string identifying the side data type
771 const char *av_frame_side_data_name(enum AVFrameSideDataType type);
777 #endif /* AVUTIL_FRAME_H */