// Copyright 2011 Google Inc. All Rights Reserved. // // Use of this source code is governed by a BSD-style license // that can be found in the COPYING file in the root of the source // tree. An additional intellectual property rights grant can be found // in the file PATENTS. All contributing project authors may // be found in the AUTHORS file in the root of the source tree. // ----------------------------------------------------------------------------- // // Internal header for mux library. // // Author: Urvang (urvang@google.com) #ifndef WEBP_MUX_MUXI_H_ #define WEBP_MUX_MUXI_H_ #include #include "../dec/vp8i.h" #include "../dec/vp8li.h" #include "../webp/mux.h" #ifdef __cplusplus extern "C" { #endif //------------------------------------------------------------------------------ // Defines and constants. #define MUX_MAJ_VERSION 0 #define MUX_MIN_VERSION 3 #define MUX_REV_VERSION 1 // Chunk object. typedef struct WebPChunk WebPChunk; struct WebPChunk { uint32_t tag_; int owner_; // True if *data_ memory is owned internally. // VP8X, ANIM, and other internally created chunks // like ANMF/FRGM are always owned. WebPData data_; WebPChunk* next_; }; // MuxImage object. Store a full WebP image (including ANMF/FRGM chunk, ALPH // chunk and VP8/VP8L chunk), typedef struct WebPMuxImage WebPMuxImage; struct WebPMuxImage { WebPChunk* header_; // Corresponds to WEBP_CHUNK_ANMF/WEBP_CHUNK_FRGM. WebPChunk* alpha_; // Corresponds to WEBP_CHUNK_ALPHA. WebPChunk* img_; // Corresponds to WEBP_CHUNK_IMAGE. WebPChunk* unknown_; // Corresponds to WEBP_CHUNK_UNKNOWN. int width_; int height_; int has_alpha_; // Through ALPH chunk or as part of VP8L. int is_partial_; // True if only some of the chunks are filled. WebPMuxImage* next_; }; // Main mux object. Stores data chunks. struct WebPMux { WebPMuxImage* images_; WebPChunk* iccp_; WebPChunk* exif_; WebPChunk* xmp_; WebPChunk* anim_; WebPChunk* vp8x_; WebPChunk* unknown_; int canvas_width_; int canvas_height_; }; // CHUNK_INDEX enum: used for indexing within 'kChunks' (defined below) only. // Note: the reason for having two enums ('WebPChunkId' and 'CHUNK_INDEX') is to // allow two different chunks to have the same id (e.g. WebPChunkId // 'WEBP_CHUNK_IMAGE' can correspond to CHUNK_INDEX 'IDX_VP8' or 'IDX_VP8L'). typedef enum { IDX_VP8X = 0, IDX_ICCP, IDX_ANIM, IDX_ANMF, IDX_FRGM, IDX_ALPHA, IDX_VP8, IDX_VP8L, IDX_EXIF, IDX_XMP, IDX_UNKNOWN, IDX_NIL, IDX_LAST_CHUNK } CHUNK_INDEX; #define NIL_TAG 0x00000000u // To signal void chunk. typedef struct { uint32_t tag; WebPChunkId id; uint32_t size; } ChunkInfo; extern const ChunkInfo kChunks[IDX_LAST_CHUNK]; //------------------------------------------------------------------------------ // Chunk object management. // Initialize. void ChunkInit(WebPChunk* const chunk); // Get chunk index from chunk tag. Returns IDX_UNKNOWN if not found. CHUNK_INDEX ChunkGetIndexFromTag(uint32_t tag); // Get chunk id from chunk tag. Returns WEBP_CHUNK_UNKNOWN if not found. WebPChunkId ChunkGetIdFromTag(uint32_t tag); // Convert a fourcc string to a tag. uint32_t ChunkGetTagFromFourCC(const char fourcc[4]); // Get chunk index from fourcc. Returns IDX_UNKNOWN if given fourcc is unknown. CHUNK_INDEX ChunkGetIndexFromFourCC(const char fourcc[4]); // Search for nth chunk with given 'tag' in the chunk list. // nth = 0 means "last of the list". WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag); // Fill the chunk with the given data. WebPMuxError ChunkAssignData(WebPChunk* chunk, const WebPData* const data, int copy_data, uint32_t tag); // Sets 'chunk' at nth position in the 'chunk_list'. // nth = 0 has the special meaning "last of the list". // On success ownership is transferred from 'chunk' to the 'chunk_list'. WebPMuxError ChunkSetNth(WebPChunk* chunk, WebPChunk** chunk_list, uint32_t nth); // Releases chunk and returns chunk->next_. WebPChunk* ChunkRelease(WebPChunk* const chunk); // Deletes given chunk & returns chunk->next_. WebPChunk* ChunkDelete(WebPChunk* const chunk); // Deletes all chunks in the given chunk list. void ChunkListDelete(WebPChunk** const chunk_list); // Returns size of the chunk including chunk header and padding byte (if any). static WEBP_INLINE size_t SizeWithPadding(size_t chunk_size) { return CHUNK_HEADER_SIZE + ((chunk_size + 1) & ~1U); } // Size of a chunk including header and padding. static WEBP_INLINE size_t ChunkDiskSize(const WebPChunk* chunk) { const size_t data_size = chunk->data_.size; assert(data_size < MAX_CHUNK_PAYLOAD); return SizeWithPadding(data_size); } // Total size of a list of chunks. size_t ChunkListDiskSize(const WebPChunk* chunk_list); // Write out the given list of chunks into 'dst'. uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst); //------------------------------------------------------------------------------ // MuxImage object management. // Initialize. void MuxImageInit(WebPMuxImage* const wpi); // Releases image 'wpi' and returns wpi->next. WebPMuxImage* MuxImageRelease(WebPMuxImage* const wpi); // Delete image 'wpi' and return the next image in the list or NULL. // 'wpi' can be NULL. WebPMuxImage* MuxImageDelete(WebPMuxImage* const wpi); // Count number of images matching the given tag id in the 'wpi_list'. // If id == WEBP_CHUNK_NIL, all images will be matched. int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id); // Update width/height/has_alpha info from chunks within wpi. // Also remove ALPH chunk if not needed. int MuxImageFinalize(WebPMuxImage* const wpi); // Check if given ID corresponds to an image related chunk. static WEBP_INLINE int IsWPI(WebPChunkId id) { switch (id) { case WEBP_CHUNK_ANMF: case WEBP_CHUNK_FRGM: case WEBP_CHUNK_ALPHA: case WEBP_CHUNK_IMAGE: return 1; default: return 0; } } // Pushes 'wpi' at the end of 'wpi_list'. WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list); // Delete nth image in the image list. WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth); // Get nth image in the image list. WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth, WebPMuxImage** wpi); // Total size of the given image. size_t MuxImageDiskSize(const WebPMuxImage* const wpi); // Write out the given image into 'dst'. uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst); //------------------------------------------------------------------------------ // Helper methods for mux. // Checks if the given image list contains at least one image with alpha. int MuxHasAlpha(const WebPMuxImage* images); // Write out RIFF header into 'data', given total data size 'size'. uint8_t* MuxEmitRiffHeader(uint8_t* const data, size_t size); // Returns the list where chunk with given ID is to be inserted in mux. WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, WebPChunkId id); // Validates the given mux object. WebPMuxError MuxValidate(const WebPMux* const mux); //------------------------------------------------------------------------------ #ifdef __cplusplus } // extern "C" #endif #endif /* WEBP_MUX_MUXI_H_ */