/*

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 /**
  * @file
  * @ingroup lavu_frame
  * reference-counted frame API
  */
 

 #ifndef AVUTIL_FRAME_H
 #define AVUTIL_FRAME_H
 

 #include <stddef.h>

 #include <stdint.h>
 
 #include "avutil.h"
 #include "buffer.h"

 #include "dict.h"

 #include "rational.h"
 #include "samplefmt.h"

 #include "pixfmt.h"

 #include "version.h"

 
 /**
  * @defgroup lavu_frame AVFrame
  * @ingroup lavu_data
  *
  * @{
  * AVFrame is an abstraction for reference-counted raw multimedia data.
  */
 

 enum AVFrameSideDataType {
     /**
      * The data is the AVPanScan struct defined in libavcodec.
      */
     AV_FRAME_DATA_PANSCAN,

     /**
      * ATSC A53 Part 4 Closed Captions.
      * A53 CC bitstream is stored as uint8_t in AVFrameSideData.data.
      * The number of bytes of CC data is AVFrameSideData.size.
      */
     AV_FRAME_DATA_A53_CC,

     /**
      * Stereoscopic 3d metadata.
      * The data is the AVStereo3D struct defined in libavutil/stereo3d.h.
      */
     AV_FRAME_DATA_STEREO3D,

     /**
      * The data is the AVMatrixEncoding enum defined in libavutil/channel_layout.h.
      */
     AV_FRAME_DATA_MATRIXENCODING,

     /**
      * Metadata relevant to a downmix procedure.
      * The data is the AVDownmixInfo struct defined in libavutil/downmix_info.h.
      */
     AV_FRAME_DATA_DOWNMIX_INFO,

     /**
      * ReplayGain information in the form of the AVReplayGain struct.
      */
     AV_FRAME_DATA_REPLAYGAIN,

     /**
      * This side data contains a 3x3 transformation matrix describing an affine
      * transformation that needs to be applied to the frame for correct
      * presentation.
      *
      * See libavutil/display.h for a detailed description of the data.
      */
     AV_FRAME_DATA_DISPLAYMATRIX,

     /**

      * Active Format Description data consisting of a single byte as specified

      * in ETSI TS 101 154 using AVActiveFormatDescription enum.

      */
     AV_FRAME_DATA_AFD,

     /**
      * Motion vectors exported by some codecs (on demand through the export_mvs
      * flag set in the libavcodec AVCodecContext flags2 option).
      * The data is the AVMotionVector struct defined in
      * libavutil/motion_vector.h.
      */
     AV_FRAME_DATA_MOTION_VECTORS,

     /**
      * Recommmends skipping the specified number of samples. This is exported
      * only if the "skip_manual" AVOption is set in libavcodec.
      * This has the same format as AV_PKT_DATA_SKIP_SAMPLES.
      * @code
      * u32le number of samples to skip from start of this packet
      * u32le number of samples to skip from end of this packet
      * u8    reason for start skip
      * u8    reason for end   skip (0=padding silence, 1=convergence)
      * @endcode
      */
     AV_FRAME_DATA_SKIP_SAMPLES,

     /**
      * This side data must be associated with an audio frame and corresponds to
      * enum AVAudioServiceType defined in avcodec.h.
      */
     AV_FRAME_DATA_AUDIO_SERVICE_TYPE,

     /**
      * Mastering display metadata associated with a video frame. The payload is
      * an AVMasteringDisplayMetadata type and contains information about the
      * mastering display color volume.
      */

     AV_FRAME_DATA_MASTERING_DISPLAY_METADATA,
     /**
      * The GOP timecode in 25 bit timecode format. Data format is 64-bit integer.
      * This is set on the first frame of a GOP that has a temporal reference of 0.
      */

     AV_FRAME_DATA_GOP_TIMECODE,
 
     /**
      * The data represents the AVSphericalMapping structure defined in
      * libavutil/spherical.h.
      */
     AV_FRAME_DATA_SPHERICAL,

 
     /**
      * Content light level (based on CTA-861.3). This payload contains data in
      * the form of the AVContentLightMetadata struct.
      */
     AV_FRAME_DATA_CONTENT_LIGHT_LEVEL,

 
     /**
      * The data contains an ICC profile as an opaque octet buffer following the
      * format described by ISO 15076-1 with an optional name defined in the
      * metadata key entry "name".
      */
     AV_FRAME_DATA_ICC_PROFILE,

 
 #if FF_API_FRAME_QP
     /**
      * Implementation-specific description of the format of AV_FRAME_QP_TABLE_DATA.
      * The contents of this side data are undocumented and internal; use
      * av_frame_set_qp_table() and av_frame_get_qp_table() to access this in a
      * meaningful way instead.
      */
     AV_FRAME_DATA_QP_TABLE_PROPERTIES,
 
     /**
      * Raw QP table data. Its format is described by
      * AV_FRAME_DATA_QP_TABLE_PROPERTIES. Use av_frame_set_qp_table() and
      * av_frame_get_qp_table() to access this instead.
      */
     AV_FRAME_DATA_QP_TABLE_DATA,
 #endif

 };
 

 enum AVActiveFormatDescription {
     AV_AFD_SAME         = 8,
     AV_AFD_4_3          = 9,
     AV_AFD_16_9         = 10,
     AV_AFD_14_9         = 11,

     AV_AFD_4_3_SP_14_9  = 13,
     AV_AFD_16_9_SP_14_9 = 14,

     AV_AFD_SP_4_3       = 15,

 };
 

 
 /**
  * Structure to hold side data for an AVFrame.
  *
  * sizeof(AVFrameSideData) is not a part of the public ABI, so new fields may be added
  * to the end with a minor bump.
  */

 typedef struct AVFrameSideData {
     enum AVFrameSideDataType type;
     uint8_t *data;
     int      size;
     AVDictionary *metadata;

     AVBufferRef *buf;

 } AVFrameSideData;

 
 /**
  * This structure describes decoded (raw) audio or video data.
  *

  * AVFrame must be allocated using av_frame_alloc(). Note that this only

  * allocates the AVFrame itself, the buffers for the data must be managed
  * through other means (see below).
  * AVFrame must be freed with av_frame_free().
  *
  * AVFrame is typically allocated once and then reused multiple times to hold
  * different data (e.g. a single AVFrame to hold frames received from a
  * decoder). In such a case, av_frame_unref() will free any references held by
  * the frame and reset it to its original clean state before it
  * is reused again.
  *
  * The data described by an AVFrame is usually reference counted through the
  * AVBuffer API. The underlying buffer references are stored in AVFrame.buf /
  * AVFrame.extended_buf. An AVFrame is considered to be reference counted if at
  * least one reference is set, i.e. if AVFrame.buf[0] != NULL. In such a case,
  * every single data plane must be contained in one of the buffers in
  * AVFrame.buf or AVFrame.extended_buf.
  * There may be a single buffer for all the data, or one separate buffer for
  * each plane, or anything in between.
  *
  * sizeof(AVFrame) is not a part of the public ABI, so new fields may be added
  * to the end with a minor bump.

  *
  * Fields can be accessed through AVOptions, the name string used, matches the

  * C structure field name for fields accessible through AVOptions. The AVClass

  * for AVFrame can be obtained from avcodec_get_frame_class()

  */
 typedef struct AVFrame {
 #define AV_NUM_DATA_POINTERS 8
     /**
      * pointer to the picture/channel planes.
      * This might be different from the first allocated byte

      *
      * Some decoders access areas outside 0,0 - width,height, please
      * see avcodec_align_dimensions2(). Some filters and swscale can read
      * up to 16 bytes beyond the planes, if these filters are to be used,
      * then 16 extra bytes must be allocated.

      *
      * NOTE: Except for hwaccel formats, pointers not needed by the format
      * MUST be set to NULL.

      */
     uint8_t *data[AV_NUM_DATA_POINTERS];
 
     /**
      * For video, size in bytes of each picture line.
      * For audio, size in bytes of each plane.
      *
      * For audio, only linesize[0] may be set. For planar audio, each channel
      * plane must be the same size.

      *

      * For video the linesizes should be multiples of the CPUs alignment

      * preference, this is 16 or 32 for modern desktop CPUs.

      * Some code requires such alignment other code can be slower without
      * correct alignment, for yet other it makes no difference.

      *

      * @note The linesize may be larger than the size of usable data -- there
      * may be extra padding present for performance reasons.

      */
     int linesize[AV_NUM_DATA_POINTERS];
 
     /**
      * pointers to the data planes/channels.
      *
      * For video, this should simply point to data[].
      *
      * For planar audio, each channel has a separate data pointer, and
      * linesize[0] contains the size of each channel buffer.
      * For packed audio, there is just one data pointer, and linesize[0]
      * contains the total size of the buffer for all channels.
      *
      * Note: Both data and extended_data should always be set in a valid frame,
      * but for planar audio with more channels that can fit in data,
      * extended_data must be used in order to access all channels.
      */
     uint8_t **extended_data;
 
     /**

      * @name Video dimensions
      * Video frames only. The coded dimensions (in pixels) of the video frame,
      * i.e. the size of the rectangle that contains some well-defined values.
      *
      * @note The part of the frame intended for display/presentation is further
      * restricted by the @ref cropping "Cropping rectangle".
      * @{

      */
     int width, height;

     /**
      * @}
      */

 
     /**
      * number of audio samples (per channel) described by this frame
      */
     int nb_samples;
 
     /**
      * format of the frame, -1 if unknown or unset
      * Values correspond to enum AVPixelFormat for video frames,
      * enum AVSampleFormat for audio)
      */
     int format;
 
     /**
      * 1 -> keyframe, 0-> not
      */
     int key_frame;
 
     /**
      * Picture type of the frame.
      */
     enum AVPictureType pict_type;
 
     /**
      * Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
      */
     AVRational sample_aspect_ratio;
 
     /**
      * Presentation timestamp in time_base units (time when frame should be shown to user).
      */
     int64_t pts;
 

 #if FF_API_PKT_PTS

     /**
      * PTS copied from the AVPacket that was decoded to produce this frame.

      * @deprecated use the pts field instead

      */

     attribute_deprecated

     int64_t pkt_pts;

 #endif

 
     /**

      * DTS copied from the AVPacket that triggered returning this frame. (if frame threading isn't used)

      * This is also the Presentation time of this AVFrame calculated from
      * only AVPacket.dts values without pts values.

      */
     int64_t pkt_dts;
 
     /**
      * picture number in bitstream order
      */
     int coded_picture_number;
     /**
      * picture number in display order
      */
     int display_picture_number;
 
     /**
      * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
      */
     int quality;
 
     /**
      * for some private data of the user
      */
     void *opaque;
 

 #if FF_API_ERROR_FRAME

     /**

      * @deprecated unused

      */

     attribute_deprecated

     uint64_t error[AV_NUM_DATA_POINTERS];

 #endif

 
     /**
      * When decoding, this signals how much the picture must be delayed.
      * extra_delay = repeat_pict / (2*fps)
      */
     int repeat_pict;
 
     /**
      * The content of the picture is interlaced.
      */
     int interlaced_frame;
 
     /**
      * If the content is interlaced, is top field displayed first.
      */
     int top_field_first;
 
     /**
      * Tell user application that palette has changed from previous frame.
      */
     int palette_has_changed;
 
     /**

      * reordered opaque 64 bits (generally an integer or a double precision float

      * PTS but can be anything).
      * The user sets AVCodecContext.reordered_opaque to represent the input at
      * that time,
      * the decoder reorders values as needed and sets AVFrame.reordered_opaque
      * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
      * @deprecated in favor of pkt_pts
      */
     int64_t reordered_opaque;
 
     /**
      * Sample rate of the audio data.
      */
     int sample_rate;
 
     /**
      * Channel layout of the audio data.
      */
     uint64_t channel_layout;
 
     /**
      * AVBuffer references backing the data for this frame. If all elements of

      * this array are NULL, then this frame is not reference counted. This array
      * must be filled contiguously -- if buf[i] is non-NULL then buf[j] must
      * also be non-NULL for all j < i.

      *
      * There may be at most one AVBuffer per data plane, so for video this array
      * always contains all the references. For planar audio with more than
      * AV_NUM_DATA_POINTERS channels, there may be more buffers than can fit in
      * this array. Then the extra AVBufferRef pointers are stored in the
      * extended_buf array.
      */
     AVBufferRef *buf[AV_NUM_DATA_POINTERS];
 
     /**
      * For planar audio which requires more than AV_NUM_DATA_POINTERS
      * AVBufferRef pointers, this array will hold all the references which
      * cannot fit into AVFrame.buf.
      *
      * Note that this is different from AVFrame.extended_data, which always
      * contains all the pointers. This array only contains the extra pointers,
      * which cannot fit into AVFrame.buf.
      *
      * This array is always allocated using av_malloc() by whoever constructs
      * the frame. It is freed in av_frame_unref().
      */
     AVBufferRef **extended_buf;
     /**
      * Number of elements in extended_buf.
      */
     int        nb_extended_buf;

     AVFrameSideData **side_data;
     int            nb_side_data;

 /**

  * @defgroup lavu_frame_flags AV_FRAME_FLAGS

  * @ingroup lavu_frame

  * Flags describing additional frame properties.
  *
  * @{
  */
 
 /**

  * The frame data may be corrupted, e.g. due to decoding errors.
  */
 #define AV_FRAME_FLAG_CORRUPT       (1 << 0)

 /**

  * A flag to mark the frames which need to be decoded, but shouldn't be output.
  */
 #define AV_FRAME_FLAG_DISCARD   (1 << 2)
 /**

  * @}
  */

 
     /**

      * Frame flags, a combination of @ref lavu_frame_flags

      */
     int flags;

     /**
      * MPEG vs JPEG YUV range.
      * - encoding: Set by user
      * - decoding: Set by libavcodec
      */

     enum AVColorRange color_range;
 
     enum AVColorPrimaries color_primaries;
 
     enum AVColorTransferCharacteristic color_trc;
 

     /**
      * YUV colorspace type.
      * - encoding: Set by user
      * - decoding: Set by libavcodec
      */

     enum AVColorSpace colorspace;
 
     enum AVChromaLocation chroma_location;

     /**
      * frame timestamp estimated using various heuristics, in stream time base
      * - encoding: unused
      * - decoding: set by libavcodec, read by user.
      */
     int64_t best_effort_timestamp;
 
     /**
      * reordered pos from the last AVPacket that has been input into the decoder
      * - encoding: unused
      * - decoding: Read by user.
      */
     int64_t pkt_pos;
 
     /**
      * duration of the corresponding packet, expressed in
      * AVStream->time_base units, 0 if unknown.
      * - encoding: unused
      * - decoding: Read by user.
      */
     int64_t pkt_duration;
 
     /**
      * metadata.
      * - encoding: Set by user.
      * - decoding: Set by libavcodec.
      */
     AVDictionary *metadata;
 
     /**
      * decode error flags of the frame, set to a combination of
      * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
      * were errors during the decoding.
      * - encoding: unused
      * - decoding: set by libavcodec, read by user.
      */
     int decode_error_flags;
 #define FF_DECODE_ERROR_INVALID_BITSTREAM   1
 #define FF_DECODE_ERROR_MISSING_REFERENCE   2
 
     /**
      * number of audio channels, only used for audio.
      * - encoding: unused
      * - decoding: Read by user.
      */
     int channels;
 
     /**
      * size of the corresponding packet containing the compressed

      * frame.

      * It is set to a negative value if unknown.
      * - encoding: unused
      * - decoding: set by libavcodec, read by user.
      */
     int pkt_size;

 #if FF_API_FRAME_QP

     /**

      * QP table
      */
     attribute_deprecated
     int8_t *qscale_table;
     /**
      * QP store stride
      */
     attribute_deprecated
     int qstride;
 
     attribute_deprecated
     int qscale_type;
 

     attribute_deprecated

     AVBufferRef *qp_table_buf;

 #endif

     /**
      * For hwaccel-format frames, this should be a reference to the
      * AVHWFramesContext describing the frame.
      */
     AVBufferRef *hw_frames_ctx;

 
     /**
      * AVBufferRef for free use by the API user. FFmpeg will never check the
      * contents of the buffer ref. FFmpeg calls av_buffer_unref() on it when
      * the frame is unreferenced. av_frame_copy_props() calls create a new
      * reference with av_buffer_ref() for the target frame's opaque_ref field.
      *
      * This is unrelated to the opaque field, although it serves a similar
      * purpose.
      */
     AVBufferRef *opaque_ref;

 
     /**

      * @anchor cropping
      * @name Cropping
      * Video frames only. The number of pixels to discard from the the
      * top/bottom/left/right border of the frame to obtain the sub-rectangle of
      * the frame intended for presentation.
      * @{
      */
     size_t crop_top;
     size_t crop_bottom;
     size_t crop_left;
     size_t crop_right;
     /**
      * @}
      */

 
     /**
      * AVBufferRef for internal use by a single libav* library.
      * Must not be used to transfer data between libraries.
      * Has to be NULL when ownership of the frame leaves the respective library.
      *
      * Code outside the FFmpeg libs should never check or change the contents of the buffer ref.
      *
      * FFmpeg calls av_buffer_unref() on it when the frame is unreferenced.
      * av_frame_copy_props() calls create a new reference with av_buffer_ref()
      * for the target frame's private_ref field.
      */
     AVBufferRef *private_ref;

 } AVFrame;
 

 #if FF_API_FRAME_GET_SET

 /**

  * Accessors for some AVFrame fields. These used to be provided for ABI
  * compatibility, and do not need to be used anymore.

  */

 attribute_deprecated

 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);

 attribute_deprecated

 int64_t av_frame_get_pkt_duration         (const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_pkt_duration         (AVFrame *frame, int64_t val);

 attribute_deprecated

 int64_t av_frame_get_pkt_pos              (const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_pkt_pos              (AVFrame *frame, int64_t val);

 attribute_deprecated

 int64_t av_frame_get_channel_layout       (const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_channel_layout       (AVFrame *frame, int64_t val);

 attribute_deprecated

 int     av_frame_get_channels             (const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_channels             (AVFrame *frame, int     val);

 attribute_deprecated

 int     av_frame_get_sample_rate          (const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_sample_rate          (AVFrame *frame, int     val);

 attribute_deprecated

 AVDictionary *av_frame_get_metadata       (const AVFrame *frame);

 attribute_deprecated

 void          av_frame_set_metadata       (AVFrame *frame, AVDictionary *val);

 attribute_deprecated

 int     av_frame_get_decode_error_flags   (const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_decode_error_flags   (AVFrame *frame, int     val);

 attribute_deprecated

 int     av_frame_get_pkt_size(const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_pkt_size(AVFrame *frame, int val);

 #if FF_API_FRAME_QP

 attribute_deprecated

 int8_t *av_frame_get_qp_table(AVFrame *f, int *stride, int *type);

 attribute_deprecated

 int av_frame_set_qp_table(AVFrame *f, AVBufferRef *buf, int stride, int type);

 #endif

 attribute_deprecated

 enum AVColorSpace av_frame_get_colorspace(const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_colorspace(AVFrame *frame, enum AVColorSpace val);

 attribute_deprecated

 enum AVColorRange av_frame_get_color_range(const AVFrame *frame);

 attribute_deprecated

 void    av_frame_set_color_range(AVFrame *frame, enum AVColorRange val);

 #endif

 
 /**

  * Get the name of a colorspace.
  * @return a static string identifying the colorspace; can be NULL.
  */
 const char *av_get_colorspace_name(enum AVColorSpace val);
 
 /**

  * Allocate an AVFrame and set its fields to default values.  The resulting
  * struct must be freed using av_frame_free().
  *
  * @return An AVFrame filled with default values or NULL on failure.
  *
  * @note this only allocates the AVFrame itself, not the data buffers. Those
  * must be allocated through other means, e.g. with av_frame_get_buffer() or
  * manually.
  */
 AVFrame *av_frame_alloc(void);
 
 /**
  * Free the frame and any dynamically allocated objects in it,
  * e.g. extended_data. If the frame is reference counted, it will be
  * unreferenced first.
  *
  * @param frame frame to be freed. The pointer will be set to NULL.
  */
 void av_frame_free(AVFrame **frame);
 
 /**

  * Set up a new reference to the data described by the source frame.

  *
  * Copy frame properties from src to dst and create a new reference for each
  * AVBufferRef from src.
  *
  * If src is not reference counted, new buffers are allocated and the data is
  * copied.
  *

  * @warning: dst MUST have been either unreferenced with av_frame_unref(dst),
  *           or newly allocated with av_frame_alloc() before calling this
  *           function, or undefined behavior will occur.
  *

  * @return 0 on success, a negative AVERROR on error
  */

 int av_frame_ref(AVFrame *dst, const AVFrame *src);

 
 /**
  * Create a new frame that references the same data as src.
  *
  * This is a shortcut for av_frame_alloc()+av_frame_ref().
  *
  * @return newly created AVFrame on success, NULL on error.
  */

 AVFrame *av_frame_clone(const AVFrame *src);

 
 /**
  * Unreference all the buffers referenced by frame and reset the frame fields.
  */
 void av_frame_unref(AVFrame *frame);
 
 /**

  * Move everything contained in src to dst and reset src.

  *
  * @warning: dst is not unreferenced, but directly overwritten without reading
  *           or deallocating its contents. Call av_frame_unref(dst) manually
  *           before calling this function to ensure that no memory is leaked.

  */
 void av_frame_move_ref(AVFrame *dst, AVFrame *src);
 
 /**
  * Allocate new buffer(s) for audio or video data.
  *
  * The following fields must be set on frame before calling this function:
  * - format (pixel format for video, sample format for audio)
  * - width and height for video
  * - nb_samples and channel_layout for audio
  *
  * This function will fill AVFrame.data and AVFrame.buf arrays and, if
  * necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
  * For planar formats, one buffer will be allocated for each plane.
  *

  * @warning: if frame already has been allocated, calling this function will
  *           leak memory. In addition, undefined behavior can occur in certain
  *           cases.

  *

  * @param frame frame in which to store the new buffers.

  * @param align Required buffer size alignment. If equal to 0, alignment will be
  *              chosen automatically for the current CPU. It is highly
  *              recommended to pass 0 here unless you know what you are doing.

  *
  * @return 0 on success, a negative AVERROR on error.
  */
 int av_frame_get_buffer(AVFrame *frame, int align);
 
 /**
  * Check if the frame data is writable.
  *
  * @return A positive value if the frame data is writable (which is true if and
  * only if each of the underlying buffers has only one reference, namely the one
  * stored in this frame). Return 0 otherwise.
  *
  * If 1 is returned the answer is valid until av_buffer_ref() is called on any
  * of the underlying AVBufferRefs (e.g. through av_frame_ref() or directly).
  *
  * @see av_frame_make_writable(), av_buffer_is_writable()
  */
 int av_frame_is_writable(AVFrame *frame);
 
 /**
  * Ensure that the frame data is writable, avoiding data copy if possible.
  *
  * Do nothing if the frame is writable, allocate new buffers and copy the data
  * if it is not.
  *
  * @return 0 on success, a negative AVERROR on error.
  *
  * @see av_frame_is_writable(), av_buffer_is_writable(),
  * av_buffer_make_writable()
  */
 int av_frame_make_writable(AVFrame *frame);
 
 /**

  * Copy the frame data from src to dst.
  *
  * This function does not allocate anything, dst must be already initialized and
  * allocated with the same parameters as src.
  *
  * This function only copies the frame data (i.e. the contents of the data /
  * extended data arrays), not any other properties.
  *
  * @return >= 0 on success, a negative AVERROR on error.
  */
 int av_frame_copy(AVFrame *dst, const AVFrame *src);
 
 /**

  * Copy only "metadata" fields from src to dst.
  *
  * Metadata for the purpose of this function are those fields that do not affect
  * the data layout in the buffers.  E.g. pts, sample rate (for audio) or sample
  * aspect ratio (for video), but not width/height or channel layout.

  * Side data is also copied.

  */
 int av_frame_copy_props(AVFrame *dst, const AVFrame *src);
 
 /**
  * Get the buffer reference a given data plane is stored in.
  *
  * @param plane index of the data plane of interest in frame->extended_data.
  *
  * @return the buffer reference that contains the plane or NULL if the input
  * frame is not valid.
  */
 AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane);
 

 /**
  * Add a new side data to a frame.
  *
  * @param frame a frame to which the side data should be added
  * @param type type of the added side data
  * @param size size of the side data
  *
  * @return newly added side data on success, NULL on error
  */
 AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
                                         enum AVFrameSideDataType type,
                                         int size);
 
 /**

  * Add a new side data to a frame from an existing AVBufferRef
  *
  * @param frame a frame to which the side data should be added
  * @param type  the type of the added side data
  * @param buf   an AVBufferRef to add as side data. The ownership of
  *              the reference is transferred to the frame.
  *
  * @return newly added side data on success, NULL on error. On failure
  *         the frame is unchanged and the AVBufferRef remains owned by
  *         the caller.
  */
 AVFrameSideData *av_frame_new_side_data_from_buf(AVFrame *frame,
                                                  enum AVFrameSideDataType type,
                                                  AVBufferRef *buf);
 
 /**

  * @return a pointer to the side data of a given type on success, NULL if there
  * is no side data with such type in this frame.
  */

 AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,

                                         enum AVFrameSideDataType type);
 

 /**

  * If side data of the supplied type exists in the frame, free it and remove it
  * from the frame.
  */
 void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type);
 

 
 /**
  * Flags for frame cropping.
  */
 enum {
     /**
      * Apply the maximum possible cropping, even if it requires setting the
      * AVFrame.data[] entries to unaligned pointers. Passing unaligned data

      * to FFmpeg API is generally not allowed, and causes undefined behavior
      * (such as crashes). You can pass unaligned data only to FFmpeg APIs that

      * are explicitly documented to accept it. Use this flag only if you
      * absolutely know what you are doing.
      */
     AV_FRAME_CROP_UNALIGNED     = 1 << 0,
 };
 
 /**
  * Crop the given video AVFrame according to its crop_left/crop_top/crop_right/
  * crop_bottom fields. If cropping is successful, the function will adjust the
  * data pointers and the width/height fields, and set the crop fields to 0.
  *
  * In all cases, the cropping boundaries will be rounded to the inherent
  * alignment of the pixel format. In some cases, such as for opaque hwaccel
  * formats, the left/top cropping is ignored. The crop fields are set to 0 even
  * if the cropping was rounded or ignored.
  *
  * @param frame the frame which should be cropped
  * @param flags Some combination of AV_FRAME_CROP_* flags, or 0.
  *
  * @return >= 0 on success, a negative AVERROR on error. If the cropping fields
  * were invalid, AVERROR(ERANGE) is returned, and nothing is changed.
  */
 int av_frame_apply_cropping(AVFrame *frame, int flags);
 

 /**

  * @return a string identifying the side data type
  */
 const char *av_frame_side_data_name(enum AVFrameSideDataType type);
 
 /**

  * @}
  */
 

 #endif /* AVUTIL_FRAME_H */