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