230 lines
7.3 KiB
C++
230 lines
7.3 KiB
C++
// 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 <stdlib.h>
|
|
#include "../dec/vp8i_dec.h"
|
|
#include "../dec/vp8li_dec.h"
|
|
#include "../webp/mux.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Defines and constants.
|
|
|
|
#define MUX_MAJ_VERSION 0
|
|
#define MUX_MIN_VERSION 4
|
|
#define MUX_REV_VERSION 0
|
|
|
|
// 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 are always owned.
|
|
WebPData data_;
|
|
WebPChunk* next_;
|
|
};
|
|
|
|
// MuxImage object. Store a full WebP image (including ANMF chunk, ALPH
|
|
// chunk and VP8/VP8L chunk),
|
|
typedef struct WebPMuxImage WebPMuxImage;
|
|
struct WebPMuxImage {
|
|
WebPChunk* header_; // Corresponds to WEBP_CHUNK_ANMF.
|
|
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_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_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_ */
|