/* * 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 "channel_layout.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, /** * Timecode which conforms to SMPTE ST 12-1. The data is an array of 4 uint32_t * where the first uint32_t describes how many (1-3) of the other timecodes are used. * The timecode format is described in the documentation of av_timecode_get_smpte_from_framenum() * function in libavutil/timecode.h. */ AV_FRAME_DATA_S12M_TIMECODE, /** * HDR dynamic metadata associated with a video frame. The payload is * an AVDynamicHDRPlus type and contains information for color * volume transform - application 4 of SMPTE 2094-40:2016 standard. */ AV_FRAME_DATA_DYNAMIC_HDR_PLUS, /** * Regions Of Interest, the data is an array of AVRegionOfInterest type, the number of * array element is implied by AVFrameSideData.size / AVRegionOfInterest.self_size. */ AV_FRAME_DATA_REGIONS_OF_INTEREST, /** * Encoding parameters for a video frame, as described by AVVideoEncParams. */ AV_FRAME_DATA_VIDEO_ENC_PARAMS, /** * User data unregistered metadata associated with a video frame. * This is the H.26[45] UDU SEI message, and shouldn't be used for any other purpose * The data is stored as uint8_t in AVFrameSideData.data which is 16 bytes of * uuid_iso_iec_11578 followed by AVFrameSideData.size - 16 bytes of user_data_payload_byte. */ AV_FRAME_DATA_SEI_UNREGISTERED, /** * Film grain parameters for a frame, described by AVFilmGrainParams. * Must be present for every frame which should have film grain applied. */ AV_FRAME_DATA_FILM_GRAIN_PARAMS, /** * Bounding boxes for object detection and classification, * as described by AVDetectionBBoxHeader. */ AV_FRAME_DATA_DETECTION_BBOXES, /** * Dolby Vision RPU raw data, suitable for passing to x265 * or other libraries. Array of uint8_t, with NAL emulation * bytes intact. */ AV_FRAME_DATA_DOVI_RPU_BUFFER, /** * Parsed Dolby Vision metadata, suitable for passing to a software * implementation. The payload is the AVDOVIMetadata struct defined in * libavutil/dovi_meta.h. */ AV_FRAME_DATA_DOVI_METADATA, /** * HDR Vivid dynamic metadata associated with a video frame. The payload is * an AVDynamicHDRVivid type and contains information for color * volume transform - CUVA 005.1-2021. */ AV_FRAME_DATA_DYNAMIC_HDR_VIVID, /** * Ambient viewing environment metadata, as defined by H.274. */ AV_FRAME_DATA_AMBIENT_VIEWING_ENVIRONMENT, }; 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; size_t size; AVDictionary *metadata; AVBufferRef *buf; } AVFrameSideData; /** * Structure describing a single Region Of Interest. * * When multiple regions are defined in a single side-data block, they * should be ordered from most to least important - some encoders are only * capable of supporting a limited number of distinct regions, so will have * to truncate the list. * * When overlapping regions are defined, the first region containing a given * area of the frame applies. */ typedef struct AVRegionOfInterest { /** * Must be set to the size of this data structure (that is, * sizeof(AVRegionOfInterest)). */ uint32_t self_size; /** * Distance in pixels from the top edge of the frame to the top and * bottom edges and from the left edge of the frame to the left and * right edges of the rectangle defining this region of interest. * * The constraints on a region are encoder dependent, so the region * actually affected may be slightly larger for alignment or other * reasons. */ int top; int bottom; int left; int right; /** * Quantisation offset. * * Must be in the range -1 to +1. A value of zero indicates no quality * change. A negative value asks for better quality (less quantisation), * while a positive value asks for worse quality (greater quantisation). * * The range is calibrated so that the extreme values indicate the * largest possible offset - if the rest of the frame is encoded with the * worst possible quality, an offset of -1 indicates that this region * should be encoded with the best possible quality anyway. Intermediate * values are then interpolated in some codec-dependent way. * * For example, in 10-bit H.264 the quantisation parameter varies between * -12 and 51. A typical qoffset value of -1/10 therefore indicates that * this region should be encoded with a QP around one-tenth of the full * range better than the rest of the frame. So, if most of the frame * were to be encoded with a QP of around 30, this region would get a QP * of around 24 (an offset of approximately -1/10 * (51 - -12) = -6.3). * An extreme value of -1 would indicate that this region should be * encoded with the best possible quality regardless of the treatment of * the rest of the frame - that is, should be encoded at a QP of -12. */ AVRational qoffset; } AVRegionOfInterest; /** * 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. For video, * it could even point to the end of the image data. * * All pointers in data and extended_data must point into one of the * AVBufferRef in buf or extended_buf. * * 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: Pointers not needed by the format MUST be set to NULL. * * @attention In case of video, the data[] pointers can point to the * end of image data in order to reverse line order, when used in * combination with negative values in the linesize[] array. */ uint8_t *data[AV_NUM_DATA_POINTERS]; /** * For video, a positive or negative value, which is typically indicating * the size in bytes of each picture line, but it can also be: * - the negative byte size of lines for vertical flipping * (with data[n] pointing to the end of the data * - a positive or negative multiple of the byte size as for accessing * even and odd fields of a frame (possibly flipped) * * 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. * * @attention In case of video, line size values can be negative to achieve * a vertically inverted iteration over image lines. */ 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; #if FF_API_FRAME_KEY /** * 1 -> keyframe, 0-> not * * @deprecated Use AV_FRAME_FLAG_KEY instead */ attribute_deprecated int key_frame; #endif /** * 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; /** * 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; /** * Time base for the timestamps in this frame. * In the future, this field may be set on frames output by decoders or * filters, but its value will be by default ignored on input to encoders * or filters. */ AVRational time_base; #if FF_API_FRAME_PICTURE_NUMBER /** * picture number in bitstream order */ attribute_deprecated int coded_picture_number; /** * picture number in display order */ attribute_deprecated int display_picture_number; #endif /** * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) */ int quality; /** * Frame owner's private data. * * This field may be set by the code that allocates/owns the frame data. * It is then not touched by any library functions, except: * - it is copied to other references by av_frame_copy_props() (and hence by * av_frame_ref()); * - it is set to NULL when the frame is cleared by av_frame_unref() * - on the caller's explicit request. E.g. libavcodec encoders/decoders * will copy this field to/from @ref AVPacket "AVPackets" if the caller sets * @ref AV_CODEC_FLAG_COPY_OPAQUE. * * @see opaque_ref the reference-counted analogue */ void *opaque; /** * When decoding, this signals how much the picture must be delayed. * extra_delay = repeat_pict / (2*fps) */ int repeat_pict; #if FF_API_INTERLACED_FRAME /** * The content of the picture is interlaced. * * @deprecated Use AV_FRAME_FLAG_INTERLACED instead */ attribute_deprecated int interlaced_frame; /** * If the content is interlaced, is top field displayed first. * * @deprecated Use AV_FRAME_FLAG_TOP_FIELD_FIRST instead */ attribute_deprecated int top_field_first; #endif /** * Tell user application that palette has changed from previous frame. */ int palette_has_changed; #if FF_API_REORDERED_OPAQUE /** * 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 Use AV_CODEC_FLAG_COPY_OPAQUE instead */ attribute_deprecated int64_t reordered_opaque; #endif /** * Sample rate of the audio data. */ int sample_rate; #if FF_API_OLD_CHANNEL_LAYOUT /** * Channel layout of the audio data. * @deprecated use ch_layout instead */ attribute_deprecated uint64_t channel_layout; #endif /** * AVBuffer references backing the data for this frame. All the pointers in * data and extended_data must point inside one of the buffers in buf or * extended_buf. 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 frames that are keyframes. */ #define AV_FRAME_FLAG_KEY (1 << 1) /** * A flag to mark the frames which need to be decoded, but shouldn't be output. */ #define AV_FRAME_FLAG_DISCARD (1 << 2) /** * A flag to mark frames whose content is interlaced. */ #define AV_FRAME_FLAG_INTERLACED (1 << 3) /** * A flag to mark frames where the top field is displayed first if the content * is interlaced. */ #define AV_FRAME_FLAG_TOP_FIELD_FIRST (1 << 4) /** * @} */ /** * 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; #if FF_API_FRAME_PKT /** * reordered pos from the last AVPacket that has been input into the decoder * - encoding: unused * - decoding: Read by user. * @deprecated use AV_CODEC_FLAG_COPY_OPAQUE to pass through arbitrary user * data from packets to frames */ attribute_deprecated int64_t pkt_pos; #endif #if FF_API_PKT_DURATION /** * duration of the corresponding packet, expressed in * AVStream->time_base units, 0 if unknown. * - encoding: unused * - decoding: Read by user. * * @deprecated use duration instead */ attribute_deprecated int64_t pkt_duration; #endif /** * 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 #define FF_DECODE_ERROR_CONCEALMENT_ACTIVE 4 #define FF_DECODE_ERROR_DECODE_SLICES 8 #if FF_API_OLD_CHANNEL_LAYOUT /** * number of audio channels, only used for audio. * - encoding: unused * - decoding: Read by user. * @deprecated use ch_layout instead */ attribute_deprecated int channels; #endif #if FF_API_FRAME_PKT /** * 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. * @deprecated use AV_CODEC_FLAG_COPY_OPAQUE to pass through arbitrary user * data from packets to frames */ attribute_deprecated int pkt_size; #endif /** * For hwaccel-format frames, this should be a reference to the * AVHWFramesContext describing the frame. */ AVBufferRef *hw_frames_ctx; /** * Frame owner's private data. * * This field may be set by the code that allocates/owns the frame data. * It is then not touched by any library functions, except: * - a new reference to the underlying buffer is propagated by * av_frame_copy_props() (and hence by av_frame_ref()); * - it is unreferenced in av_frame_unref(); * - on the caller's explicit request. E.g. libavcodec encoders/decoders * will propagate a new reference to/from @ref AVPacket "AVPackets" if the * caller sets @ref AV_CODEC_FLAG_COPY_OPAQUE. * * @see opaque the plain pointer analogue */ 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; /** * Channel layout of the audio data. */ AVChannelLayout ch_layout; /** * Duration of the frame, in the same units as pts. 0 if unknown. */ int64_t duration; } AVFrame; /** * 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 ch_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. Non-refcounted frames behave as non-writable, i.e. a copy * is always made. * * @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 frame the frame to get the plane's buffer from * @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(const 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, size_t 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); /** * Remove and free all side data instances of the given type. */ 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 */