// Copyright 2019 Joe Drago. All rights reserved. // SPDX-License-Identifier: BSD-2-Clause #ifndef AVIF_AVIF_H #define AVIF_AVIF_H #include #include #ifdef __cplusplus extern "C" { #endif // --------------------------------------------------------------------------- // Export macros // AVIF_BUILDING_SHARED_LIBS should only be defined when libavif is being built // as a shared library. // AVIF_DLL should be defined if libavif is a shared library. If you are using // libavif as a CMake dependency, through a CMake package config file or through // pkg-config, this is defined automatically. // // Here's what AVIF_API will be defined as in shared build: // | | Windows | Unix | // | Build | __declspec(dllexport) | __attribute__((visibility("default"))) | // | Use | __declspec(dllimport) | | // // For static build, AVIF_API is always defined as nothing. #if defined(_WIN32) #define AVIF_HELPER_EXPORT __declspec(dllexport) #define AVIF_HELPER_IMPORT __declspec(dllimport) #elif defined(__GNUC__) && __GNUC__ >= 4 #define AVIF_HELPER_EXPORT __attribute__((visibility("default"))) #define AVIF_HELPER_IMPORT #else #define AVIF_HELPER_EXPORT #define AVIF_HELPER_IMPORT #endif #if defined(AVIF_DLL) #if defined(AVIF_BUILDING_SHARED_LIBS) #define AVIF_API AVIF_HELPER_EXPORT #else #define AVIF_API AVIF_HELPER_IMPORT #endif // defined(AVIF_BUILDING_SHARED_LIBS) #else #define AVIF_API #endif // defined(AVIF_DLL) // --------------------------------------------------------------------------- // Constants // AVIF_VERSION_DEVEL should always be 0 for official releases / version tags, // and non-zero during development of the next release. This should allow for // downstream projects to do greater-than preprocessor checks on AVIF_VERSION // to leverage in-development code without breaking their stable builds. #define AVIF_VERSION_MAJOR 1 #define AVIF_VERSION_MINOR 0 #define AVIF_VERSION_PATCH 3 #define AVIF_VERSION_DEVEL 0 #define AVIF_VERSION \ ((AVIF_VERSION_MAJOR * 1000000) + (AVIF_VERSION_MINOR * 10000) + (AVIF_VERSION_PATCH * 100) + AVIF_VERSION_DEVEL) typedef int avifBool; #define AVIF_TRUE 1 #define AVIF_FALSE 0 #define AVIF_DIAGNOSTICS_ERROR_BUFFER_SIZE 256 // A reasonable default for maximum image size (in pixel count) to avoid out-of-memory errors or // integer overflow in (32-bit) int or unsigned int arithmetic operations. #define AVIF_DEFAULT_IMAGE_SIZE_LIMIT (16384 * 16384) // A reasonable default for maximum image dimension (width or height). #define AVIF_DEFAULT_IMAGE_DIMENSION_LIMIT 32768 // a 12 hour AVIF image sequence, running at 60 fps (a basic sanity check as this is quite ridiculous) #define AVIF_DEFAULT_IMAGE_COUNT_LIMIT (12 * 3600 * 60) #define AVIF_QUALITY_DEFAULT -1 #define AVIF_QUALITY_LOSSLESS 100 #define AVIF_QUALITY_WORST 0 #define AVIF_QUALITY_BEST 100 #define AVIF_QUANTIZER_LOSSLESS 0 #define AVIF_QUANTIZER_BEST_QUALITY 0 #define AVIF_QUANTIZER_WORST_QUALITY 63 #define AVIF_PLANE_COUNT_YUV 3 #define AVIF_SPEED_DEFAULT -1 #define AVIF_SPEED_SLOWEST 0 #define AVIF_SPEED_FASTEST 10 // This value is used to indicate that an animated AVIF file has to be repeated infinitely. #define AVIF_REPETITION_COUNT_INFINITE -1 // This value is used if an animated AVIF file does not have repetitions specified using an EditList box. Applications can choose // to handle this case however they want. #define AVIF_REPETITION_COUNT_UNKNOWN -2 // The number of spatial layers in AV1, with spatial_id = 0..3. #define AVIF_MAX_AV1_LAYER_COUNT 4 typedef enum avifPlanesFlag { AVIF_PLANES_YUV = (1 << 0), AVIF_PLANES_A = (1 << 1), AVIF_PLANES_ALL = 0xff } avifPlanesFlag; typedef uint32_t avifPlanesFlags; typedef enum avifChannelIndex { // These can be used as the index for the yuvPlanes and yuvRowBytes arrays in avifImage. AVIF_CHAN_Y = 0, AVIF_CHAN_U = 1, AVIF_CHAN_V = 2, // This may not be used in yuvPlanes and yuvRowBytes, but is available for use with avifImagePlane(). AVIF_CHAN_A = 3 } avifChannelIndex; // --------------------------------------------------------------------------- // Version AVIF_API const char * avifVersion(void); AVIF_API void avifCodecVersions(char outBuffer[256]); AVIF_API unsigned int avifLibYUVVersion(void); // returns 0 if libavif wasn't compiled with libyuv support // --------------------------------------------------------------------------- // Memory management // NOTE: On memory allocation failure, the current implementation of avifAlloc() calls abort(), // but in a future release it may return NULL. To be future-proof, callers should check for a NULL // return value. AVIF_API void * avifAlloc(size_t size); AVIF_API void avifFree(void * p); // --------------------------------------------------------------------------- // avifResult typedef enum avifResult { AVIF_RESULT_OK = 0, AVIF_RESULT_UNKNOWN_ERROR = 1, AVIF_RESULT_INVALID_FTYP = 2, AVIF_RESULT_NO_CONTENT = 3, AVIF_RESULT_NO_YUV_FORMAT_SELECTED = 4, AVIF_RESULT_REFORMAT_FAILED = 5, AVIF_RESULT_UNSUPPORTED_DEPTH = 6, AVIF_RESULT_ENCODE_COLOR_FAILED = 7, AVIF_RESULT_ENCODE_ALPHA_FAILED = 8, AVIF_RESULT_BMFF_PARSE_FAILED = 9, AVIF_RESULT_MISSING_IMAGE_ITEM = 10, AVIF_RESULT_DECODE_COLOR_FAILED = 11, AVIF_RESULT_DECODE_ALPHA_FAILED = 12, AVIF_RESULT_COLOR_ALPHA_SIZE_MISMATCH = 13, AVIF_RESULT_ISPE_SIZE_MISMATCH = 14, AVIF_RESULT_NO_CODEC_AVAILABLE = 15, AVIF_RESULT_NO_IMAGES_REMAINING = 16, AVIF_RESULT_INVALID_EXIF_PAYLOAD = 17, AVIF_RESULT_INVALID_IMAGE_GRID = 18, AVIF_RESULT_INVALID_CODEC_SPECIFIC_OPTION = 19, AVIF_RESULT_TRUNCATED_DATA = 20, AVIF_RESULT_IO_NOT_SET = 21, // the avifIO field of avifDecoder is not set AVIF_RESULT_IO_ERROR = 22, AVIF_RESULT_WAITING_ON_IO = 23, // similar to EAGAIN/EWOULDBLOCK, this means the avifIO doesn't have necessary data available yet AVIF_RESULT_INVALID_ARGUMENT = 24, // an argument passed into this function is invalid AVIF_RESULT_NOT_IMPLEMENTED = 25, // a requested code path is not (yet) implemented AVIF_RESULT_OUT_OF_MEMORY = 26, AVIF_RESULT_CANNOT_CHANGE_SETTING = 27, // a setting that can't change is changed during encoding AVIF_RESULT_INCOMPATIBLE_IMAGE = 28, // the image is incompatible with already encoded images // Kept for backward compatibility; please use the symbols above instead. AVIF_RESULT_NO_AV1_ITEMS_FOUND = AVIF_RESULT_MISSING_IMAGE_ITEM } avifResult; AVIF_API const char * avifResultToString(avifResult result); // --------------------------------------------------------------------------- // avifROData/avifRWData: Generic raw memory storage typedef struct avifROData { const uint8_t * data; size_t size; } avifROData; // Note: Use avifRWDataFree() if any avif*() function populates one of these. typedef struct avifRWData { uint8_t * data; size_t size; } avifRWData; // clang-format off // Initialize avifROData/avifRWData on the stack with this #define AVIF_DATA_EMPTY { NULL, 0 } // clang-format on // The avifRWData input must be zero-initialized before being manipulated with these functions. // If AVIF_RESULT_OUT_OF_MEMORY is returned, raw is left unchanged. AVIF_API avifResult avifRWDataRealloc(avifRWData * raw, size_t newSize); AVIF_API avifResult avifRWDataSet(avifRWData * raw, const uint8_t * data, size_t len); AVIF_API void avifRWDataFree(avifRWData * raw); // --------------------------------------------------------------------------- // Metadata // Validates the first bytes of the Exif payload and finds the TIFF header offset (up to UINT32_MAX). AVIF_API avifResult avifGetExifTiffHeaderOffset(const uint8_t * exif, size_t exifSize, size_t * offset); // Returns the offset to the Exif 8-bit orientation value and AVIF_RESULT_OK, or an error. // If the offset is set to exifSize, there was no parsing error but no orientation tag was found. AVIF_API avifResult avifGetExifOrientationOffset(const uint8_t * exif, size_t exifSize, size_t * offset); // --------------------------------------------------------------------------- // avifPixelFormat // // Note to libavif maintainers: The lookup tables in avifImageYUVToRGBLibYUV // rely on the ordering of this enum values for their correctness. So changing // the values in this enum will require auditing avifImageYUVToRGBLibYUV for // correctness. typedef enum avifPixelFormat { // No YUV pixels are present. Alpha plane can still be present. AVIF_PIXEL_FORMAT_NONE = 0, AVIF_PIXEL_FORMAT_YUV444, AVIF_PIXEL_FORMAT_YUV422, AVIF_PIXEL_FORMAT_YUV420, AVIF_PIXEL_FORMAT_YUV400, AVIF_PIXEL_FORMAT_COUNT } avifPixelFormat; AVIF_API const char * avifPixelFormatToString(avifPixelFormat format); typedef struct avifPixelFormatInfo { avifBool monochrome; int chromaShiftX; int chromaShiftY; } avifPixelFormatInfo; // Returns the avifPixelFormatInfo depending on the avifPixelFormat. // When monochrome is AVIF_TRUE, chromaShiftX and chromaShiftY are set to 1 according to the AV1 specification but they should be ignored. // // Note: This function implements the second table on page 119 of the AV1 specification version 1.0.0 with Errata 1. // For monochrome 4:0:0, subsampling_x and subsampling are specified as 1 to allow // an AV1 implementation that only supports profile 0 to hardcode subsampling_x and subsampling_y to 1. AVIF_API void avifGetPixelFormatInfo(avifPixelFormat format, avifPixelFormatInfo * info); // --------------------------------------------------------------------------- // avifChromaSamplePosition typedef enum avifChromaSamplePosition { AVIF_CHROMA_SAMPLE_POSITION_UNKNOWN = 0, AVIF_CHROMA_SAMPLE_POSITION_VERTICAL = 1, AVIF_CHROMA_SAMPLE_POSITION_COLOCATED = 2 } avifChromaSamplePosition; // --------------------------------------------------------------------------- // avifRange typedef enum avifRange { AVIF_RANGE_LIMITED = 0, AVIF_RANGE_FULL = 1 } avifRange; // --------------------------------------------------------------------------- // CICP enums - https://www.itu.int/rec/T-REC-H.273-201612-S/en enum { // This is actually reserved, but libavif uses it as a sentinel value. AVIF_COLOR_PRIMARIES_UNKNOWN = 0, AVIF_COLOR_PRIMARIES_BT709 = 1, AVIF_COLOR_PRIMARIES_IEC61966_2_4 = 1, AVIF_COLOR_PRIMARIES_UNSPECIFIED = 2, AVIF_COLOR_PRIMARIES_BT470M = 4, AVIF_COLOR_PRIMARIES_BT470BG = 5, AVIF_COLOR_PRIMARIES_BT601 = 6, AVIF_COLOR_PRIMARIES_SMPTE240 = 7, AVIF_COLOR_PRIMARIES_GENERIC_FILM = 8, AVIF_COLOR_PRIMARIES_BT2020 = 9, AVIF_COLOR_PRIMARIES_XYZ = 10, AVIF_COLOR_PRIMARIES_SMPTE431 = 11, AVIF_COLOR_PRIMARIES_SMPTE432 = 12, // DCI P3 AVIF_COLOR_PRIMARIES_EBU3213 = 22 }; typedef uint16_t avifColorPrimaries; // AVIF_COLOR_PRIMARIES_* // outPrimaries: rX, rY, gX, gY, bX, bY, wX, wY AVIF_API void avifColorPrimariesGetValues(avifColorPrimaries acp, float outPrimaries[8]); AVIF_API avifColorPrimaries avifColorPrimariesFind(const float inPrimaries[8], const char ** outName); enum { // This is actually reserved, but libavif uses it as a sentinel value. AVIF_TRANSFER_CHARACTERISTICS_UNKNOWN = 0, AVIF_TRANSFER_CHARACTERISTICS_BT709 = 1, AVIF_TRANSFER_CHARACTERISTICS_UNSPECIFIED = 2, AVIF_TRANSFER_CHARACTERISTICS_BT470M = 4, // 2.2 gamma AVIF_TRANSFER_CHARACTERISTICS_BT470BG = 5, // 2.8 gamma AVIF_TRANSFER_CHARACTERISTICS_BT601 = 6, AVIF_TRANSFER_CHARACTERISTICS_SMPTE240 = 7, AVIF_TRANSFER_CHARACTERISTICS_LINEAR = 8, AVIF_TRANSFER_CHARACTERISTICS_LOG100 = 9, AVIF_TRANSFER_CHARACTERISTICS_LOG100_SQRT10 = 10, AVIF_TRANSFER_CHARACTERISTICS_IEC61966 = 11, AVIF_TRANSFER_CHARACTERISTICS_BT1361 = 12, AVIF_TRANSFER_CHARACTERISTICS_SRGB = 13, AVIF_TRANSFER_CHARACTERISTICS_BT2020_10BIT = 14, AVIF_TRANSFER_CHARACTERISTICS_BT2020_12BIT = 15, AVIF_TRANSFER_CHARACTERISTICS_SMPTE2084 = 16, // PQ AVIF_TRANSFER_CHARACTERISTICS_SMPTE428 = 17, AVIF_TRANSFER_CHARACTERISTICS_HLG = 18 }; typedef uint16_t avifTransferCharacteristics; // AVIF_TRANSFER_CHARACTERISTICS_* // If the given transfer characteristics can be expressed with a simple gamma value, sets 'gamma' // to that value and returns AVIF_RESULT_OK. Returns an error otherwise. AVIF_API avifResult avifTransferCharacteristicsGetGamma(avifTransferCharacteristics atc, float * gamma); AVIF_API avifTransferCharacteristics avifTransferCharacteristicsFindByGamma(float gamma); enum { AVIF_MATRIX_COEFFICIENTS_IDENTITY = 0, AVIF_MATRIX_COEFFICIENTS_BT709 = 1, AVIF_MATRIX_COEFFICIENTS_UNSPECIFIED = 2, AVIF_MATRIX_COEFFICIENTS_FCC = 4, AVIF_MATRIX_COEFFICIENTS_BT470BG = 5, AVIF_MATRIX_COEFFICIENTS_BT601 = 6, AVIF_MATRIX_COEFFICIENTS_SMPTE240 = 7, AVIF_MATRIX_COEFFICIENTS_YCGCO = 8, AVIF_MATRIX_COEFFICIENTS_BT2020_NCL = 9, AVIF_MATRIX_COEFFICIENTS_BT2020_CL = 10, AVIF_MATRIX_COEFFICIENTS_SMPTE2085 = 11, AVIF_MATRIX_COEFFICIENTS_CHROMA_DERIVED_NCL = 12, AVIF_MATRIX_COEFFICIENTS_CHROMA_DERIVED_CL = 13, AVIF_MATRIX_COEFFICIENTS_ICTCP = 14, #if defined(AVIF_ENABLE_EXPERIMENTAL_YCGCO_R) AVIF_MATRIX_COEFFICIENTS_YCGCO_RE = 15, AVIF_MATRIX_COEFFICIENTS_YCGCO_RO = 16, #endif AVIF_MATRIX_COEFFICIENTS_LAST }; typedef uint16_t avifMatrixCoefficients; // AVIF_MATRIX_COEFFICIENTS_* // --------------------------------------------------------------------------- // avifDiagnostics typedef struct avifDiagnostics { // Upon receiving an error from any non-const libavif API call, if the toplevel structure used // in the API call (avifDecoder, avifEncoder) contains a diag member, this buffer may be // populated with a NULL-terminated, freeform error string explaining the most recent error in // more detail. It will be cleared at the beginning of every non-const API call. // // Note: If an error string contains the "[Strict]" prefix, it means that you encountered an // error that only occurs during strict decoding. If you disable strict mode, you will no // longer encounter this error. char error[AVIF_DIAGNOSTICS_ERROR_BUFFER_SIZE]; } avifDiagnostics; AVIF_API void avifDiagnosticsClearError(avifDiagnostics * diag); // --------------------------------------------------------------------------- // Fraction utility typedef struct avifFraction { int32_t n; int32_t d; } avifFraction; // --------------------------------------------------------------------------- // Optional transformation structs typedef enum avifTransformFlag { AVIF_TRANSFORM_NONE = 0, AVIF_TRANSFORM_PASP = (1 << 0), AVIF_TRANSFORM_CLAP = (1 << 1), AVIF_TRANSFORM_IROT = (1 << 2), AVIF_TRANSFORM_IMIR = (1 << 3) } avifTransformFlag; typedef uint32_t avifTransformFlags; typedef struct avifPixelAspectRatioBox { // 'pasp' from ISO/IEC 14496-12:2015 12.1.4.3 // define the relative width and height of a pixel uint32_t hSpacing; uint32_t vSpacing; } avifPixelAspectRatioBox; typedef struct avifCleanApertureBox { // 'clap' from ISO/IEC 14496-12:2015 12.1.4.3 // a fractional number which defines the exact clean aperture width, in counted pixels, of the video image uint32_t widthN; uint32_t widthD; // a fractional number which defines the exact clean aperture height, in counted pixels, of the video image uint32_t heightN; uint32_t heightD; // a fractional number which defines the horizontal offset of clean aperture centre minus (width-1)/2. Typically 0. uint32_t horizOffN; uint32_t horizOffD; // a fractional number which defines the vertical offset of clean aperture centre minus (height-1)/2. Typically 0. uint32_t vertOffN; uint32_t vertOffD; } avifCleanApertureBox; typedef struct avifImageRotation { // 'irot' from ISO/IEC 23008-12:2017 6.5.10 // angle * 90 specifies the angle (in anti-clockwise direction) in units of degrees. uint8_t angle; // legal values: [0-3] } avifImageRotation; typedef struct avifImageMirror { // 'imir' from ISO/IEC 23008-12:2022 6.5.12: // // 'axis' specifies how the mirroring is performed: // // 0 indicates that the top and bottom parts of the image are exchanged; // 1 specifies that the left and right parts are exchanged. // // NOTE In Exif, orientation tag can be used to signal mirroring operations. Exif // orientation tag 4 corresponds to axis = 0 of ImageMirror, and Exif orientation tag 2 // corresponds to axis = 1 accordingly. // // Legal values: [0, 1] uint8_t axis; } avifImageMirror; // --------------------------------------------------------------------------- // avifCropRect - Helper struct/functions to work with avifCleanApertureBox typedef struct avifCropRect { uint32_t x; uint32_t y; uint32_t width; uint32_t height; } avifCropRect; // These will return AVIF_FALSE if the resultant values violate any standards, and if so, the output // values are not guaranteed to be complete or correct and should not be used. AVIF_API avifBool avifCropRectConvertCleanApertureBox(avifCropRect * cropRect, const avifCleanApertureBox * clap, uint32_t imageW, uint32_t imageH, avifPixelFormat yuvFormat, avifDiagnostics * diag); AVIF_API avifBool avifCleanApertureBoxConvertCropRect(avifCleanApertureBox * clap, const avifCropRect * cropRect, uint32_t imageW, uint32_t imageH, avifPixelFormat yuvFormat, avifDiagnostics * diag); // --------------------------------------------------------------------------- // avifContentLightLevelInformationBox typedef struct avifContentLightLevelInformationBox { // 'clli' from ISO/IEC 23000-22:2019 (MIAF) 7.4.4.2.2. The SEI message semantics written above // each entry were originally described in ISO/IEC 23008-2. // max_content_light_level, when not equal to 0, indicates an upper bound on the maximum light // level among all individual samples in a 4:4:4 representation of red, green, and blue colour // primary intensities (in the linear light domain) for the pictures of the CLVS, in units of // candelas per square metre. When equal to 0, no such upper bound is indicated by // max_content_light_level. uint16_t maxCLL; // max_pic_average_light_level, when not equal to 0, indicates an upper bound on the maximum // average light level among the samples in a 4:4:4 representation of red, green, and blue // colour primary intensities (in the linear light domain) for any individual picture of the // CLVS, in units of candelas per square metre. When equal to 0, no such upper bound is // indicated by max_pic_average_light_level. uint16_t maxPALL; } avifContentLightLevelInformationBox; // --------------------------------------------------------------------------- // avifImage // NOTE: The avifImage struct may be extended in a future release. Code outside the libavif library // must allocate avifImage by calling the avifImageCreate() or avifImageCreateEmpty() function. typedef struct avifImage { // Image information uint32_t width; uint32_t height; uint32_t depth; // all planes must share this depth; if depth>8, all planes are uint16_t internally avifPixelFormat yuvFormat; avifRange yuvRange; avifChromaSamplePosition yuvChromaSamplePosition; uint8_t * yuvPlanes[AVIF_PLANE_COUNT_YUV]; uint32_t yuvRowBytes[AVIF_PLANE_COUNT_YUV]; avifBool imageOwnsYUVPlanes; uint8_t * alphaPlane; uint32_t alphaRowBytes; avifBool imageOwnsAlphaPlane; avifBool alphaPremultiplied; // ICC Profile avifRWData icc; // CICP information: // These are stored in the AV1 payload and used to signal YUV conversion. Additionally, if an // ICC profile is not specified, these will be stored in the AVIF container's `colr` box with // a type of `nclx`. If your system supports ICC profiles, be sure to check for the existence // of one (avifImage.icc) before relying on the values listed here! avifColorPrimaries colorPrimaries; avifTransferCharacteristics transferCharacteristics; avifMatrixCoefficients matrixCoefficients; // CLLI information: // Content Light Level Information. Used to represent maximum and average light level of an // image. Useful for tone mapping HDR images, especially when using transfer characteristics // SMPTE2084 (PQ). The default value of (0, 0) means the content light level information is // unknown or unavailable, and will cause libavif to avoid writing a clli box for it. avifContentLightLevelInformationBox clli; // Transformations - These metadata values are encoded/decoded when transformFlags are set // appropriately, but do not impact/adjust the actual pixel buffers used (images won't be // pre-cropped or mirrored upon decode). Basic explanations from the standards are offered in // comments above, but for detailed explanations, please refer to the HEIF standard (ISO/IEC // 23008-12:2017) and the BMFF standard (ISO/IEC 14496-12:2015). // // To encode any of these boxes, set the values in the associated box, then enable the flag in // transformFlags. On decode, only honor the values in boxes with the associated transform flag set. avifTransformFlags transformFlags; avifPixelAspectRatioBox pasp; avifCleanApertureBox clap; avifImageRotation irot; avifImageMirror imir; // Metadata - set with avifImageSetMetadata*() before write, check .size>0 for existence after read avifRWData exif; avifRWData xmp; // Version 1.0.0 ends here. Add any new members after this line. } avifImage; // avifImageCreate() and avifImageCreateEmpty() return NULL if arguments are invalid or if a memory allocation failed. AVIF_API avifImage * avifImageCreate(uint32_t width, uint32_t height, uint32_t depth, avifPixelFormat yuvFormat); AVIF_API avifImage * avifImageCreateEmpty(void); // helper for making an image to decode into AVIF_API avifResult avifImageCopy(avifImage * dstImage, const avifImage * srcImage, avifPlanesFlags planes); // deep copy AVIF_API avifResult avifImageSetViewRect(avifImage * dstImage, const avifImage * srcImage, const avifCropRect * rect); // shallow copy, no metadata AVIF_API void avifImageDestroy(avifImage * image); AVIF_API avifResult avifImageSetProfileICC(avifImage * image, const uint8_t * icc, size_t iccSize); // Sets Exif metadata. Attempts to parse the Exif metadata for Exif orientation. Sets // image->transformFlags, image->irot and image->imir if the Exif metadata is parsed successfully, // otherwise leaves image->transformFlags, image->irot and image->imir unchanged. // Warning: If the Exif payload is set and invalid, avifEncoderWrite() may return AVIF_RESULT_INVALID_EXIF_PAYLOAD. AVIF_API avifResult avifImageSetMetadataExif(avifImage * image, const uint8_t * exif, size_t exifSize); // Sets XMP metadata. AVIF_API avifResult avifImageSetMetadataXMP(avifImage * image, const uint8_t * xmp, size_t xmpSize); AVIF_API avifResult avifImageAllocatePlanes(avifImage * image, avifPlanesFlags planes); // Ignores any pre-existing planes AVIF_API void avifImageFreePlanes(avifImage * image, avifPlanesFlags planes); // Ignores already-freed planes AVIF_API void avifImageStealPlanes(avifImage * dstImage, avifImage * srcImage, avifPlanesFlags planes); // --------------------------------------------------------------------------- // Understanding maxThreads // // libavif's structures and API use the setting 'maxThreads' in a few places. The intent of this // setting is to limit concurrent thread activity/usage, not necessarily to put a hard ceiling on // how many sleeping threads happen to exist behind the scenes. The goal of this setting is to // ensure that at any given point during libavif's encoding or decoding, no more than *maxThreads* // threads are simultaneously **active and taking CPU time**. // // As an important example, when encoding an image sequence that has an alpha channel, two // long-lived underlying AV1 encoders must simultaneously exist (one for color, one for alpha). For // each additional frame fed into libavif, its YUV planes are fed into one instance of the AV1 // encoder, and its alpha plane is fed into another. These operations happen serially, so only one // of these AV1 encoders is ever active at a time. However, the AV1 encoders might pre-create a // pool of worker threads upon initialization, so during this process, twice the amount of worker // threads actually simultaneously exist on the machine, but half of them are guaranteed to be // sleeping. // // This design ensures that AV1 implementations are given as many threads as possible to ensure a // speedy encode or decode, despite the complexities of occasionally needing two AV1 codec instances // (due to alpha payloads being separate from color payloads). If your system has a hard ceiling on // the number of threads that can ever be in flight at a given time, please account for this // accordingly. // --------------------------------------------------------------------------- // Optional YUV<->RGB support // To convert to/from RGB, create an avifRGBImage on the stack, call avifRGBImageSetDefaults() on // it, and then tweak the values inside of it accordingly. At a minimum, you should populate // ->pixels and ->rowBytes with an appropriately sized pixel buffer, which should be at least // (->rowBytes * ->height) bytes, where ->rowBytes is at least (->width * avifRGBImagePixelSize()). // If you don't want to supply your own pixel buffer, you can use the // avifRGBImageAllocatePixels()/avifRGBImageFreePixels() convenience functions. // avifImageRGBToYUV() and avifImageYUVToRGB() will perform depth rescaling and limited<->full range // conversion, if necessary. Pixels in an avifRGBImage buffer are always full range, and conversion // routines will fail if the width and height don't match the associated avifImage. // If libavif is built with a version of libyuv offering a fast conversion between RGB and YUV for // the given inputs, libavif will use it. See reformat_libyuv.c for the details. // libyuv is faster but may have slightly less precision than built-in conversion, so avoidLibYUV // can be set to AVIF_TRUE when AVIF_CHROMA_UPSAMPLING_BEST_QUALITY or // AVIF_CHROMA_DOWNSAMPLING_BEST_QUALITY is used, to get the most precise but slowest results. // Note to libavif maintainers: The lookup tables in avifImageYUVToRGBLibYUV // rely on the ordering of this enum values for their correctness. So changing // the values in this enum will require auditing avifImageYUVToRGBLibYUV for // correctness. typedef enum avifRGBFormat { AVIF_RGB_FORMAT_RGB = 0, AVIF_RGB_FORMAT_RGBA, // This is the default format set in avifRGBImageSetDefaults(). AVIF_RGB_FORMAT_ARGB, AVIF_RGB_FORMAT_BGR, AVIF_RGB_FORMAT_BGRA, AVIF_RGB_FORMAT_ABGR, // RGB_565 format uses five bits for the red and blue components and six // bits for the green component. Each RGB pixel is 16 bits (2 bytes), which // is packed as follows: // uint16_t: [r4 r3 r2 r1 r0 g5 g4 g3 g2 g1 g0 b4 b3 b2 b1 b0] // r4 and r0 are the MSB and LSB of the red component respectively. // g5 and g0 are the MSB and LSB of the green component respectively. // b4 and b0 are the MSB and LSB of the blue component respectively. // This format is only supported for YUV -> RGB conversion and when // avifRGBImage.depth is set to 8. AVIF_RGB_FORMAT_RGB_565, AVIF_RGB_FORMAT_COUNT } avifRGBFormat; AVIF_API uint32_t avifRGBFormatChannelCount(avifRGBFormat format); AVIF_API avifBool avifRGBFormatHasAlpha(avifRGBFormat format); typedef enum avifChromaUpsampling { AVIF_CHROMA_UPSAMPLING_AUTOMATIC = 0, // Chooses best trade off of speed/quality (uses BILINEAR libyuv if available, // or falls back to NEAREST libyuv if available, or falls back to BILINEAR built-in) AVIF_CHROMA_UPSAMPLING_FASTEST = 1, // Chooses speed over quality (same as NEAREST) AVIF_CHROMA_UPSAMPLING_BEST_QUALITY = 2, // Chooses the best quality upsampling, given settings (same as BILINEAR) AVIF_CHROMA_UPSAMPLING_NEAREST = 3, // Uses nearest-neighbor filter AVIF_CHROMA_UPSAMPLING_BILINEAR = 4 // Uses bilinear filter } avifChromaUpsampling; typedef enum avifChromaDownsampling { AVIF_CHROMA_DOWNSAMPLING_AUTOMATIC = 0, // Chooses best trade off of speed/quality (same as AVERAGE) AVIF_CHROMA_DOWNSAMPLING_FASTEST = 1, // Chooses speed over quality (same as AVERAGE) AVIF_CHROMA_DOWNSAMPLING_BEST_QUALITY = 2, // Chooses the best quality upsampling (same as AVERAGE) AVIF_CHROMA_DOWNSAMPLING_AVERAGE = 3, // Uses averaging filter AVIF_CHROMA_DOWNSAMPLING_SHARP_YUV = 4 // Uses sharp yuv filter (libsharpyuv), available for 4:2:0 only, ignored for 4:2:2 } avifChromaDownsampling; // NOTE: avifRGBImage must be initialized with avifRGBImageSetDefaults() (preferred) or memset() // before use. typedef struct avifRGBImage { uint32_t width; // must match associated avifImage uint32_t height; // must match associated avifImage uint32_t depth; // legal depths [8, 10, 12, 16]. if depth>8, pixels must be uint16_t internally avifRGBFormat format; // all channels are always full range avifChromaUpsampling chromaUpsampling; // How to upsample from 4:2:0 or 4:2:2 UV when converting to RGB (ignored for 4:4:4 and 4:0:0). // Ignored when converting to YUV. Defaults to AVIF_CHROMA_UPSAMPLING_AUTOMATIC. avifChromaDownsampling chromaDownsampling; // How to downsample to 4:2:0 or 4:2:2 UV when converting from RGB (ignored for 4:4:4 and 4:0:0). // Ignored when converting to RGB. Defaults to AVIF_CHROMA_DOWNSAMPLING_AUTOMATIC. avifBool avoidLibYUV; // If AVIF_FALSE and libyuv conversion between RGB and YUV (including upsampling or downsampling if any) // is available for the avifImage/avifRGBImage combination, then libyuv is used. Default is AVIF_FALSE. avifBool ignoreAlpha; // Used for XRGB formats, treats formats containing alpha (such as ARGB) as if they were RGB, treating // the alpha bits as if they were all 1. avifBool alphaPremultiplied; // indicates if RGB value is pre-multiplied by alpha. Default: false avifBool isFloat; // indicates if RGBA values are in half float (f16) format. Valid only when depth == 16. Default: false int maxThreads; // Number of threads to be used for the YUV to RGB conversion. Note that this value is ignored for RGB to YUV // conversion. Setting this to zero has the same effect as setting it to one. Negative values are invalid. // Default: 1. uint8_t * pixels; uint32_t rowBytes; } avifRGBImage; // Sets rgb->width, rgb->height, and rgb->depth to image->width, image->height, and image->depth. // Sets rgb->pixels to NULL and rgb->rowBytes to 0. Sets the other fields of 'rgb' to default // values. AVIF_API void avifRGBImageSetDefaults(avifRGBImage * rgb, const avifImage * image); AVIF_API uint32_t avifRGBImagePixelSize(const avifRGBImage * rgb); // Convenience functions. If you supply your own pixels/rowBytes, you do not need to use these. AVIF_API avifResult avifRGBImageAllocatePixels(avifRGBImage * rgb); AVIF_API void avifRGBImageFreePixels(avifRGBImage * rgb); // The main conversion functions AVIF_API avifResult avifImageRGBToYUV(avifImage * image, const avifRGBImage * rgb); AVIF_API avifResult avifImageYUVToRGB(const avifImage * image, avifRGBImage * rgb); // Premultiply handling functions. // (Un)premultiply is automatically done by the main conversion functions above, // so usually you don't need to call these. They are there for convenience. AVIF_API avifResult avifRGBImagePremultiplyAlpha(avifRGBImage * rgb); AVIF_API avifResult avifRGBImageUnpremultiplyAlpha(avifRGBImage * rgb); // --------------------------------------------------------------------------- // YUV Utils AVIF_API int avifFullToLimitedY(uint32_t depth, int v); AVIF_API int avifFullToLimitedUV(uint32_t depth, int v); AVIF_API int avifLimitedToFullY(uint32_t depth, int v); AVIF_API int avifLimitedToFullUV(uint32_t depth, int v); // --------------------------------------------------------------------------- // Codec selection typedef enum avifCodecChoice { AVIF_CODEC_CHOICE_AUTO = 0, AVIF_CODEC_CHOICE_AOM, AVIF_CODEC_CHOICE_DAV1D, // Decode only AVIF_CODEC_CHOICE_LIBGAV1, // Decode only AVIF_CODEC_CHOICE_RAV1E, // Encode only AVIF_CODEC_CHOICE_SVT, // Encode only AVIF_CODEC_CHOICE_AVM // Experimental (AV2) } avifCodecChoice; typedef enum avifCodecFlag { AVIF_CODEC_FLAG_CAN_DECODE = (1 << 0), AVIF_CODEC_FLAG_CAN_ENCODE = (1 << 1) } avifCodecFlag; typedef uint32_t avifCodecFlags; // If this returns NULL, the codec choice/flag combination is unavailable AVIF_API const char * avifCodecName(avifCodecChoice choice, avifCodecFlags requiredFlags); AVIF_API avifCodecChoice avifCodecChoiceFromName(const char * name); // --------------------------------------------------------------------------- // avifIO struct avifIO; // Destroy must completely destroy all child structures *and* free the avifIO object itself. // This function pointer is optional, however, if the avifIO object isn't intended to be owned by // a libavif encoder/decoder. typedef void (*avifIODestroyFunc)(struct avifIO * io); // This function should return a block of memory that *must* remain valid until another read call to // this avifIO struct is made (reusing a read buffer is acceptable/expected). // // * If offset exceeds the size of the content (past EOF), return AVIF_RESULT_IO_ERROR. // * If offset is *exactly* at EOF, provide a 0-byte buffer and return AVIF_RESULT_OK. // * If (offset+size) exceeds the contents' size, it must truncate the range to provide all // bytes from the offset to EOF. // * If the range is unavailable yet (due to network conditions or any other reason), // return AVIF_RESULT_WAITING_ON_IO. // * Otherwise, provide the range and return AVIF_RESULT_OK. typedef avifResult (*avifIOReadFunc)(struct avifIO * io, uint32_t readFlags, uint64_t offset, size_t size, avifROData * out); typedef avifResult (*avifIOWriteFunc)(struct avifIO * io, uint32_t writeFlags, uint64_t offset, const uint8_t * data, size_t size); typedef struct avifIO { avifIODestroyFunc destroy; avifIOReadFunc read; // This is reserved for future use - but currently ignored. Set it to a null pointer. avifIOWriteFunc write; // If non-zero, this is a hint to internal structures of the max size offered by the content // this avifIO structure is reading. If it is a static memory source, it should be the size of // the memory buffer; if it is a file, it should be the file's size. If this information cannot // be known (as it is streamed-in), set a reasonable upper boundary here (larger than the file // can possibly be for your environment, but within your environment's memory constraints). This // is used for sanity checks when allocating internal buffers to protect against // malformed/malicious files. uint64_t sizeHint; // If true, *all* memory regions returned from *all* calls to read are guaranteed to be // persistent and exist for the lifetime of the avifIO object. If false, libavif will make // in-memory copies of samples and metadata content, and a memory region returned from read must // only persist until the next call to read. avifBool persistent; // The contents of this are defined by the avifIO implementation, and should be fully destroyed // by the implementation of the associated destroy function, unless it isn't owned by the avifIO // struct. It is not necessary to use this pointer in your implementation. void * data; } avifIO; AVIF_API avifIO * avifIOCreateMemoryReader(const uint8_t * data, size_t size); AVIF_API avifIO * avifIOCreateFileReader(const char * filename); AVIF_API void avifIODestroy(avifIO * io); // --------------------------------------------------------------------------- // avifDecoder // Some encoders (including very old versions of avifenc) do not implement the AVIF standard // perfectly, and thus create invalid files. However, these files are likely still recoverable / // decodable, if it wasn't for the strict requirements imposed by libavif's decoder. These flags // allow a user of avifDecoder to decide what level of strictness they want in their project. typedef enum avifStrictFlag { // Disables all strict checks. AVIF_STRICT_DISABLED = 0, // Requires the PixelInformationProperty ('pixi') be present in AV1 image items. libheif v1.11.0 // or older does not add the 'pixi' item property to AV1 image items. If you need to decode AVIF // images encoded by libheif v1.11.0 or older, be sure to disable this bit. (This issue has been // corrected in libheif v1.12.0.) AVIF_STRICT_PIXI_REQUIRED = (1 << 0), // This demands that the values surfaced in the clap box are valid, determined by attempting to // convert the clap box to a crop rect using avifCropRectConvertCleanApertureBox(). If this // function returns AVIF_FALSE and this strict flag is set, the decode will fail. AVIF_STRICT_CLAP_VALID = (1 << 1), // Requires the ImageSpatialExtentsProperty ('ispe') be present in alpha auxiliary image items. // avif-serialize 0.7.3 or older does not add the 'ispe' item property to alpha auxiliary image // items. If you need to decode AVIF images encoded by the cavif encoder with avif-serialize // 0.7.3 or older, be sure to disable this bit. (This issue has been corrected in avif-serialize // 0.7.4.) See https://github.com/kornelski/avif-serialize/issues/3 and // https://crbug.com/1246678. AVIF_STRICT_ALPHA_ISPE_REQUIRED = (1 << 2), // Maximum strictness; enables all bits above. This is avifDecoder's default. AVIF_STRICT_ENABLED = AVIF_STRICT_PIXI_REQUIRED | AVIF_STRICT_CLAP_VALID | AVIF_STRICT_ALPHA_ISPE_REQUIRED } avifStrictFlag; typedef uint32_t avifStrictFlags; // Useful stats related to a read/write typedef struct avifIOStats { // Size in bytes of the AV1 image item or track data containing color samples. size_t colorOBUSize; // Size in bytes of the AV1 image item or track data containing alpha samples. size_t alphaOBUSize; } avifIOStats; struct avifDecoderData; typedef enum avifDecoderSource { // Honor the major brand signaled in the beginning of the file to pick between an AVIF sequence // ('avis', tracks-based) or a single image ('avif', item-based). If the major brand is neither // of these, prefer the AVIF sequence ('avis', tracks-based), if present. AVIF_DECODER_SOURCE_AUTO = 0, // Use the primary item and the aux (alpha) item in the avif(s). // This is where single-image avifs store their image. AVIF_DECODER_SOURCE_PRIMARY_ITEM, // Use the chunks inside primary/aux tracks in the moov block. // This is where avifs image sequences store their images. AVIF_DECODER_SOURCE_TRACKS // Decode the thumbnail item. Currently unimplemented. // AVIF_DECODER_SOURCE_THUMBNAIL_ITEM } avifDecoderSource; // Information about the timing of a single image in an image sequence typedef struct avifImageTiming { uint64_t timescale; // timescale of the media (Hz) double pts; // presentation timestamp in seconds (ptsInTimescales / timescale) uint64_t ptsInTimescales; // presentation timestamp in "timescales" double duration; // in seconds (durationInTimescales / timescale) uint64_t durationInTimescales; // duration in "timescales" } avifImageTiming; typedef enum avifProgressiveState { // The current AVIF/Source does not offer a progressive image. This will always be the state // for an image sequence. AVIF_PROGRESSIVE_STATE_UNAVAILABLE = 0, // The current AVIF/Source offers a progressive image, but avifDecoder.allowProgressive is not // enabled, so it will behave as if the image was not progressive and will simply decode the // best version of this item. AVIF_PROGRESSIVE_STATE_AVAILABLE, // The current AVIF/Source offers a progressive image, and avifDecoder.allowProgressive is true. // In this state, avifDecoder.imageCount will be the count of all of the available progressive // layers, and any specific layer can be decoded using avifDecoderNthImage() as if it was an // image sequence, or simply using repeated calls to avifDecoderNextImage() to decode better and // better versions of this image. AVIF_PROGRESSIVE_STATE_ACTIVE } avifProgressiveState; AVIF_API const char * avifProgressiveStateToString(avifProgressiveState progressiveState); // NOTE: The avifDecoder struct may be extended in a future release. Code outside the libavif // library must allocate avifDecoder by calling the avifDecoderCreate() function. typedef struct avifDecoder { // -------------------------------------------------------------------------------------------- // Inputs // Defaults to AVIF_CODEC_CHOICE_AUTO: Preference determined by order in availableCodecs table (avif.c) avifCodecChoice codecChoice; // Defaults to 1. -- NOTE: Please see the "Understanding maxThreads" comment block above int maxThreads; // avifs can have multiple sets of images in them. This specifies which to decode. // Set this via avifDecoderSetSource(). avifDecoderSource requestedSource; // If this is true and a progressive AVIF is decoded, avifDecoder will behave as if the AVIF is // an image sequence, in that it will set imageCount to the number of progressive frames // available, and avifDecoderNextImage()/avifDecoderNthImage() will allow for specific layers // of a progressive image to be decoded. To distinguish between a progressive AVIF and an AVIF // image sequence, inspect avifDecoder.progressiveState. avifBool allowProgressive; // If this is false, avifDecoderNextImage() will start decoding a frame only after there are // enough input bytes to decode all of that frame. If this is true, avifDecoder will decode each // subimage or grid cell as soon as possible. The benefits are: grid images may be partially // displayed before being entirely available, and the overall decoding may finish earlier. // Must be set before calling avifDecoderNextImage() or avifDecoderNthImage(). // WARNING: Experimental feature. avifBool allowIncremental; // Enable any of these to avoid reading and surfacing specific data to the decoded avifImage. // These can be useful if your avifIO implementation heavily uses AVIF_RESULT_WAITING_ON_IO for // streaming data, as some of these payloads are (unfortunately) packed at the end of the file, // which will cause avifDecoderParse() to return AVIF_RESULT_WAITING_ON_IO until it finds them. // If you don't actually leverage this data, it is best to ignore it here. avifBool ignoreExif; avifBool ignoreXMP; // This represents the maximum size of an image (in pixel count) that libavif and the underlying // AV1 decoder should attempt to decode. It defaults to AVIF_DEFAULT_IMAGE_SIZE_LIMIT, and can // be set to a smaller value. The value 0 is reserved. // Note: Only some underlying AV1 codecs support a configurable size limit (such as dav1d). uint32_t imageSizeLimit; // This represents the maximum dimension of an image (width or height) that libavif should // attempt to decode. It defaults to AVIF_DEFAULT_IMAGE_DIMENSION_LIMIT. Set it to 0 to ignore // the limit. uint32_t imageDimensionLimit; // This provides an upper bound on how many images the decoder is willing to attempt to decode, // to provide a bit of protection from malicious or malformed AVIFs citing millions upon // millions of frames, only to be invalid later. The default is AVIF_DEFAULT_IMAGE_COUNT_LIMIT // (see comment above), and setting this to 0 disables the limit. uint32_t imageCountLimit; // Strict flags. Defaults to AVIF_STRICT_ENABLED. See avifStrictFlag definitions above. avifStrictFlags strictFlags; // -------------------------------------------------------------------------------------------- // Outputs // All decoded image data; owned by the decoder. All information in this image is incrementally // added and updated as avifDecoder*() functions are called. After a successful call to // avifDecoderParse(), all values in decoder->image (other than the planes/rowBytes themselves) // will be pre-populated with all information found in the outer AVIF container, prior to any // AV1 decoding. If the contents of the inner AV1 payload disagree with the outer container, // these values may change after calls to avifDecoderRead*(),avifDecoderNextImage(), or // avifDecoderNthImage(). // // The YUV and A contents of this image are likely owned by the decoder, so be sure to copy any // data inside of this image before advancing to the next image or reusing the decoder. It is // legal to call avifImageYUVToRGB() on this in between calls to avifDecoderNextImage(), but use // avifImageCopy() if you want to make a complete, permanent copy of this image's YUV content or // metadata. avifImage * image; // Counts and timing for the current image in an image sequence. Uninteresting for single image files. int imageIndex; // 0-based int imageCount; // Always 1 for non-progressive, non-sequence AVIFs. avifProgressiveState progressiveState; // See avifProgressiveState declaration avifImageTiming imageTiming; // uint64_t timescale; // timescale of the media (Hz) double duration; // duration of a single playback of the image sequence in seconds // (durationInTimescales / timescale) uint64_t durationInTimescales; // duration of a single playback of the image sequence in "timescales" int repetitionCount; // number of times the sequence has to be repeated. This can also be one of // AVIF_REPETITION_COUNT_INFINITE or AVIF_REPETITION_COUNT_UNKNOWN. Essentially, if // repetitionCount is a non-negative integer `n`, then the image sequence should be // played back `n + 1` times. // This is true when avifDecoderParse() detects an alpha plane. Use this to find out if alpha is // present after a successful call to avifDecoderParse(), but prior to any call to // avifDecoderNextImage() or avifDecoderNthImage(), as decoder->image->alphaPlane won't exist yet. avifBool alphaPresent; // stats from the most recent read, possibly 0s if reading an image sequence avifIOStats ioStats; // Additional diagnostics (such as detailed error state) avifDiagnostics diag; // -------------------------------------------------------------------------------------------- // Internals // Use one of the avifDecoderSetIO*() functions to set this avifIO * io; // Internals used by the decoder struct avifDecoderData * data; // Version 1.0.0 ends here. Add any new members after this line. } avifDecoder; AVIF_API avifDecoder * avifDecoderCreate(void); AVIF_API void avifDecoderDestroy(avifDecoder * decoder); // Simple interfaces to decode a single image, independent of the decoder afterwards (decoder may be destroyed). AVIF_API avifResult avifDecoderRead(avifDecoder * decoder, avifImage * image); // call avifDecoderSetIO*() first AVIF_API avifResult avifDecoderReadMemory(avifDecoder * decoder, avifImage * image, const uint8_t * data, size_t size); AVIF_API avifResult avifDecoderReadFile(avifDecoder * decoder, avifImage * image, const char * filename); // Multi-function alternative to avifDecoderRead() for image sequences and gaining direct access // to the decoder's YUV buffers (for performance's sake). Data passed into avifDecoderParse() is NOT // copied, so it must continue to exist until the decoder is destroyed. // // Usage / function call order is: // * avifDecoderCreate() // * avifDecoderSetSource() - optional, the default (AVIF_DECODER_SOURCE_AUTO) is usually sufficient // * avifDecoderSetIO*() // * avifDecoderParse() // * avifDecoderNextImage() - in a loop, using decoder->image after each successful call // * avifDecoderDestroy() // // NOTE: Until avifDecoderParse() returns AVIF_RESULT_OK, no data in avifDecoder should // be considered valid, and no queries (such as Keyframe/Timing/MaxExtent) should be made. // // You can use avifDecoderReset() any time after a successful call to avifDecoderParse() // to reset the internal decoder back to before the first frame. Calling either // avifDecoderSetSource() or avifDecoderParse() will automatically Reset the decoder. // // avifDecoderSetSource() allows you not only to choose whether to parse tracks or // items in a file containing both, but switch between sources without having to // Parse again. Normally AVIF_DECODER_SOURCE_AUTO is enough for the common path. AVIF_API avifResult avifDecoderSetSource(avifDecoder * decoder, avifDecoderSource source); // Note: When avifDecoderSetIO() is called, whether 'decoder' takes ownership of 'io' depends on // whether io->destroy is set. avifDecoderDestroy(decoder) calls avifIODestroy(io), which calls // io->destroy(io) if io->destroy is set. Therefore, if io->destroy is not set, then // avifDecoderDestroy(decoder) has no effects on 'io'. AVIF_API void avifDecoderSetIO(avifDecoder * decoder, avifIO * io); AVIF_API avifResult avifDecoderSetIOMemory(avifDecoder * decoder, const uint8_t * data, size_t size); AVIF_API avifResult avifDecoderSetIOFile(avifDecoder * decoder, const char * filename); AVIF_API avifResult avifDecoderParse(avifDecoder * decoder); AVIF_API avifResult avifDecoderNextImage(avifDecoder * decoder); AVIF_API avifResult avifDecoderNthImage(avifDecoder * decoder, uint32_t frameIndex); AVIF_API avifResult avifDecoderReset(avifDecoder * decoder); // Keyframe information // frameIndex - 0-based, matching avifDecoder->imageIndex, bound by avifDecoder->imageCount // "nearest" keyframe means the keyframe prior to this frame index (returns frameIndex if it is a keyframe) // These functions may be used after a successful call (AVIF_RESULT_OK) to avifDecoderParse(). AVIF_API avifBool avifDecoderIsKeyframe(const avifDecoder * decoder, uint32_t frameIndex); AVIF_API uint32_t avifDecoderNearestKeyframe(const avifDecoder * decoder, uint32_t frameIndex); // Timing helper - This does not change the current image or invoke the codec (safe to call repeatedly) // This function may be used after a successful call (AVIF_RESULT_OK) to avifDecoderParse(). AVIF_API avifResult avifDecoderNthImageTiming(const avifDecoder * decoder, uint32_t frameIndex, avifImageTiming * outTiming); // When avifDecoderNextImage() or avifDecoderNthImage() returns AVIF_RESULT_WAITING_ON_IO, this // function can be called next to retrieve the number of top rows that can be immediately accessed // from the luma plane of decoder->image, and alpha if any. The corresponding rows from the chroma planes, // if any, can also be accessed (half rounded up if subsampled, same number of rows otherwise). // decoder->allowIncremental must be set to true before calling avifDecoderNextImage() or // avifDecoderNthImage(). Returns decoder->image->height when the last call to avifDecoderNextImage() or // avifDecoderNthImage() returned AVIF_RESULT_OK. Returns 0 in all other cases. // WARNING: Experimental feature. AVIF_API uint32_t avifDecoderDecodedRowCount(const avifDecoder * decoder); // --------------------------------------------------------------------------- // avifExtent typedef struct avifExtent { uint64_t offset; size_t size; } avifExtent; // Streaming data helper - Use this to calculate the maximal AVIF data extent encompassing all AV1 // sample data needed to decode the Nth image. The offset will be the earliest offset of all // required AV1 extents for this frame, and the size will create a range including the last byte of // the last AV1 sample needed. Note that this extent may include non-sample data, as a frame's // sample data may be broken into multiple extents and interleaved with other data, or in // non-sequential order. This extent will also encompass all AV1 samples that this frame's sample // depends on to decode (such as samples for reference frames), from the nearest keyframe up to this // Nth frame. // // If avifDecoderNthImageMaxExtent() returns AVIF_RESULT_OK and the extent's size is 0 bytes, this // signals that libavif doesn't expect to call avifIO's Read for this frame's decode. This happens if // data for this frame was read as a part of avifDecoderParse() (typically in an idat box inside of // a meta box). // // This function may be used after a successful call (AVIF_RESULT_OK) to avifDecoderParse(). AVIF_API avifResult avifDecoderNthImageMaxExtent(const avifDecoder * decoder, uint32_t frameIndex, avifExtent * outExtent); // --------------------------------------------------------------------------- // avifEncoder struct avifEncoderData; struct avifCodecSpecificOptions; typedef struct avifScalingMode { avifFraction horizontal; avifFraction vertical; } avifScalingMode; // Notes: // * The avifEncoder struct may be extended in a future release. Code outside the libavif library // must allocate avifEncoder by calling the avifEncoderCreate() function. // * If avifEncoderWrite() returns AVIF_RESULT_OK, output must be freed with avifRWDataFree() // * If (maxThreads < 2), multithreading is disabled // * NOTE: Please see the "Understanding maxThreads" comment block above // * Quality range: [AVIF_QUALITY_WORST - AVIF_QUALITY_BEST] // * Quantizer range: [AVIF_QUANTIZER_BEST_QUALITY - AVIF_QUANTIZER_WORST_QUALITY] // * In older versions of libavif, the avifEncoder struct doesn't have the quality and qualityAlpha // fields. For backward compatibility, if the quality field is not set, the default value of // quality is based on the average of minQuantizer and maxQuantizer. Similarly the default value // of qualityAlpha is based on the average of minQuantizerAlpha and maxQuantizerAlpha. New code // should set quality and qualityAlpha and leave minQuantizer, maxQuantizer, minQuantizerAlpha, // and maxQuantizerAlpha initialized to their default values. // * To enable tiling, set tileRowsLog2 > 0 and/or tileColsLog2 > 0. // Tiling values range [0-6], where the value indicates a request for 2^n tiles in that dimension. // If autoTiling is set to AVIF_TRUE, libavif ignores tileRowsLog2 and tileColsLog2 and // automatically chooses suitable tiling values. // * Speed range: [AVIF_SPEED_SLOWEST - AVIF_SPEED_FASTEST]. Slower should make for a better quality // image in less bytes. AVIF_SPEED_DEFAULT means "Leave the AV1 codec to its default speed settings"./ // If avifEncoder uses rav1e, the speed value is directly passed through (0-10). If libaom is used, // a combination of settings are tweaked to simulate this speed range. // * Extra layer count: [0 - (AVIF_MAX_AV1_LAYER_COUNT-1)]. Non-zero value indicates a layered // (progressive) image. // * Some encoder settings can be changed after encoding starts. Changes will take effect in the next // call to avifEncoderAddImage(). typedef struct avifEncoder { // Defaults to AVIF_CODEC_CHOICE_AUTO: Preference determined by order in availableCodecs table (avif.c) avifCodecChoice codecChoice; // settings (see Notes above) int maxThreads; int speed; int keyframeInterval; // Any set of |keyframeInterval| consecutive frames will have at least one keyframe. When it is 0, // there is no such restriction. uint64_t timescale; // timescale of the media (Hz) int repetitionCount; // Number of times the image sequence should be repeated. This can also be set to // AVIF_REPETITION_COUNT_INFINITE for infinite repetitions. Only applicable for image sequences. // Essentially, if repetitionCount is a non-negative integer `n`, then the image sequence should be // played back `n + 1` times. Defaults to AVIF_REPETITION_COUNT_INFINITE. uint32_t extraLayerCount; // EXPERIMENTAL: Non-zero value encodes layered image. // changeable encoder settings int quality; int qualityAlpha; int minQuantizer; int maxQuantizer; int minQuantizerAlpha; int maxQuantizerAlpha; int tileRowsLog2; int tileColsLog2; avifBool autoTiling; avifScalingMode scalingMode; // stats from the most recent write avifIOStats ioStats; // Additional diagnostics (such as detailed error state) avifDiagnostics diag; // Internals used by the encoder struct avifEncoderData * data; struct avifCodecSpecificOptions * csOptions; // Version 1.0.0 ends here. Add any new members after this line. } avifEncoder; // avifEncoderCreate() returns NULL if a memory allocation failed. AVIF_API avifEncoder * avifEncoderCreate(void); AVIF_API avifResult avifEncoderWrite(avifEncoder * encoder, const avifImage * image, avifRWData * output); AVIF_API void avifEncoderDestroy(avifEncoder * encoder); typedef enum avifAddImageFlag { AVIF_ADD_IMAGE_FLAG_NONE = 0, // Force this frame to be a keyframe (sync frame). AVIF_ADD_IMAGE_FLAG_FORCE_KEYFRAME = (1 << 0), // Use this flag when encoding a single frame, single layer image. // Signals "still_picture" to AV1 encoders, which tweaks various compression rules. // This is enabled automatically when using the avifEncoderWrite() single-image encode path. AVIF_ADD_IMAGE_FLAG_SINGLE = (1 << 1) } avifAddImageFlag; typedef uint32_t avifAddImageFlags; // Multi-function alternative to avifEncoderWrite() for advanced features. // // Usage / function call order is: // * avifEncoderCreate() // - Still image: // * avifEncoderAddImage() [exactly once] // - Still image grid: // * avifEncoderAddImageGrid() [exactly once, AVIF_ADD_IMAGE_FLAG_SINGLE is assumed] // - Image sequence: // * Set encoder->timescale (Hz) correctly // * avifEncoderAddImage() ... [repeatedly; at least once] // - Still layered image: // * Set encoder->extraLayerCount correctly // * avifEncoderAddImage() ... [exactly encoder->extraLayerCount+1 times] // - Still layered grid: // * Set encoder->extraLayerCount correctly // * avifEncoderAddImageGrid() ... [exactly encoder->extraLayerCount+1 times] // * avifEncoderFinish() // * avifEncoderDestroy() // // The image passed to avifEncoderAddImage() or avifEncoderAddImageGrid() is encoded during the // call (which may be slow) and can be freed after the function returns. // durationInTimescales is ignored if AVIF_ADD_IMAGE_FLAG_SINGLE is set in addImageFlags, // or if we are encoding a layered image. AVIF_API avifResult avifEncoderAddImage(avifEncoder * encoder, const avifImage * image, uint64_t durationInTimescales, avifAddImageFlags addImageFlags); AVIF_API avifResult avifEncoderAddImageGrid(avifEncoder * encoder, uint32_t gridCols, uint32_t gridRows, const avifImage * const * cellImages, avifAddImageFlags addImageFlags); AVIF_API avifResult avifEncoderFinish(avifEncoder * encoder, avifRWData * output); // Codec-specific, optional "advanced" tuning settings, in the form of string key/value pairs, // to be consumed by the codec in the next avifEncoderAddImage() call. // See the codec documentation to know if a setting is persistent or applied only to the next frame. // key must be non-NULL, but passing a NULL value will delete the pending key, if it exists. // Setting an incorrect or unknown option for the current codec will cause errors of type // AVIF_RESULT_INVALID_CODEC_SPECIFIC_OPTION from avifEncoderWrite() or avifEncoderAddImage(). AVIF_API avifResult avifEncoderSetCodecSpecificOption(avifEncoder * encoder, const char * key, const char * value); // Helpers AVIF_API avifBool avifImageUsesU16(const avifImage * image); AVIF_API avifBool avifImageIsOpaque(const avifImage * image); // channel can be an avifChannelIndex. AVIF_API uint8_t * avifImagePlane(const avifImage * image, int channel); AVIF_API uint32_t avifImagePlaneRowBytes(const avifImage * image, int channel); AVIF_API uint32_t avifImagePlaneWidth(const avifImage * image, int channel); AVIF_API uint32_t avifImagePlaneHeight(const avifImage * image, int channel); // Returns AVIF_TRUE if input begins with a valid FileTypeBox (ftyp) that supports // either the brand 'avif' or 'avis' (or both), without performing any allocations. AVIF_API avifBool avifPeekCompatibleFileType(const avifROData * input); #ifdef __cplusplus } // extern "C" #endif #endif // ifndef AVIF_AVIF_H