272 lines
8.6 KiB
C
272 lines
8.6 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
|
|
//
|
|
// This code is licensed under the same terms as WebM:
|
|
// Software License Agreement: http://www.webmproject.org/license/software/
|
|
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// 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.h"
|
|
#include "../dec/vp8li.h"
|
|
#include "../format_constants.h"
|
|
#include "../mux.h"
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Defines and constants.
|
|
|
|
// Chunk object.
|
|
typedef struct WebPChunk WebPChunk;
|
|
struct WebPChunk {
|
|
uint32_t tag_;
|
|
int owner_; // True if *data_ memory is owned internally.
|
|
// VP8X, Loop, and other internally created chunks
|
|
// like frame/tile are always owned.
|
|
WebPData data_;
|
|
WebPChunk* next_;
|
|
};
|
|
|
|
// MuxImage object. Store a full webp image (including frame/tile chunk, alpha
|
|
// chunk and VP8/VP8L chunk),
|
|
typedef struct WebPMuxImage WebPMuxImage;
|
|
struct WebPMuxImage {
|
|
WebPChunk* header_; // Corresponds to WEBP_CHUNK_FRAME/WEBP_CHUNK_TILE.
|
|
WebPChunk* alpha_; // Corresponds to WEBP_CHUNK_ALPHA.
|
|
WebPChunk* img_; // Corresponds to WEBP_CHUNK_IMAGE.
|
|
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* meta_;
|
|
WebPChunk* loop_;
|
|
WebPChunk* vp8x_;
|
|
|
|
WebPChunk* unknown_;
|
|
};
|
|
|
|
// 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_LOOP,
|
|
IDX_FRAME,
|
|
IDX_TILE,
|
|
IDX_ALPHA,
|
|
IDX_VP8,
|
|
IDX_VP8L,
|
|
IDX_META,
|
|
IDX_UNKNOWN,
|
|
|
|
IDX_NIL,
|
|
IDX_LAST_CHUNK
|
|
} CHUNK_INDEX;
|
|
|
|
#define NIL_TAG 0x00000000u // To signal void chunk.
|
|
|
|
#define MKFOURCC(a, b, c, d) ((uint32_t)(a) | (b) << 8 | (c) << 16 | (d) << 24)
|
|
|
|
typedef struct {
|
|
uint32_t tag;
|
|
WebPChunkId id;
|
|
uint32_t size;
|
|
} ChunkInfo;
|
|
|
|
extern const ChunkInfo kChunks[IDX_LAST_CHUNK];
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helper functions.
|
|
|
|
// Read 16, 24 or 32 bits stored in little-endian order.
|
|
static WEBP_INLINE int GetLE16(const uint8_t* const data) {
|
|
return (int)(data[0] << 0) | (data[1] << 8);
|
|
}
|
|
|
|
static WEBP_INLINE int GetLE24(const uint8_t* const data) {
|
|
return GetLE16(data) | (data[2] << 16);
|
|
}
|
|
|
|
static WEBP_INLINE uint32_t GetLE32(const uint8_t* const data) {
|
|
return (uint32_t)GetLE16(data) | (GetLE16(data + 2) << 16);
|
|
}
|
|
|
|
// Store 16, 24 or 32 bits in little-endian order.
|
|
static WEBP_INLINE void PutLE16(uint8_t* const data, int val) {
|
|
assert(val < (1 << 16));
|
|
data[0] = (val >> 0);
|
|
data[1] = (val >> 8);
|
|
}
|
|
|
|
static WEBP_INLINE void PutLE24(uint8_t* const data, int val) {
|
|
assert(val < (1 << 24));
|
|
PutLE16(data, val & 0xffff);
|
|
data[2] = (val >> 16);
|
|
}
|
|
|
|
static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) {
|
|
PutLE16(data, (int)(val & 0xffff));
|
|
PutLE16(data + 2, (int)(val >> 16));
|
|
}
|
|
|
|
static WEBP_INLINE size_t SizeWithPadding(size_t chunk_size) {
|
|
return CHUNK_HEADER_SIZE + ((chunk_size + 1) & ~1U);
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Chunk object management.
|
|
|
|
// Initialize.
|
|
void ChunkInit(WebPChunk* const chunk);
|
|
|
|
// Get chunk index from chunk tag. Returns IDX_NIL if not found.
|
|
CHUNK_INDEX ChunkGetIndexFromTag(uint32_t tag);
|
|
|
|
// Get chunk id from chunk tag. Returns WEBP_CHUNK_NIL if not found.
|
|
WebPChunkId ChunkGetIdFromTag(uint32_t tag);
|
|
|
|
// 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".
|
|
WebPMuxError ChunkSetNth(const 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);
|
|
|
|
// 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 ChunksListDiskSize(const WebPChunk* chunk_list);
|
|
|
|
// Write out the given list of chunks into 'dst'.
|
|
uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst);
|
|
|
|
// Get the width & height of image stored in 'image_chunk'.
|
|
WebPMuxError MuxGetImageWidthHeight(const WebPChunk* const image_chunk,
|
|
int* const width, int* const height);
|
|
|
|
//------------------------------------------------------------------------------
|
|
// 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);
|
|
|
|
// Delete all images in 'wpi_list'.
|
|
void MuxImageDeleteAll(WebPMuxImage** const wpi_list);
|
|
|
|
// Count number of images matching the given tag id in the 'wpi_list'.
|
|
int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id);
|
|
|
|
// Check if given ID corresponds to an image related chunk.
|
|
static WEBP_INLINE int IsWPI(WebPChunkId id) {
|
|
switch (id) {
|
|
case WEBP_CHUNK_FRAME:
|
|
case WEBP_CHUNK_TILE:
|
|
case WEBP_CHUNK_ALPHA:
|
|
case WEBP_CHUNK_IMAGE: return 1;
|
|
default: return 0;
|
|
}
|
|
}
|
|
|
|
// Get a reference to appropriate chunk list within an image given chunk tag.
|
|
static WEBP_INLINE WebPChunk** MuxImageGetListFromId(
|
|
const WebPMuxImage* const wpi, WebPChunkId id) {
|
|
assert(wpi != NULL);
|
|
switch (id) {
|
|
case WEBP_CHUNK_FRAME:
|
|
case WEBP_CHUNK_TILE: return (WebPChunk**)&wpi->header_;
|
|
case WEBP_CHUNK_ALPHA: return (WebPChunk**)&wpi->alpha_;
|
|
case WEBP_CHUNK_IMAGE: return (WebPChunk**)&wpi->img_;
|
|
default: return NULL;
|
|
}
|
|
}
|
|
|
|
// Pushes 'wpi' at the end of 'wpi_list'.
|
|
WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list);
|
|
|
|
// Delete nth image in the image list with given tag id.
|
|
WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth,
|
|
WebPChunkId id);
|
|
|
|
// Get nth image in the image list with given tag id.
|
|
WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth,
|
|
WebPChunkId id, WebPMuxImage** wpi);
|
|
|
|
// Total size of the given image.
|
|
size_t MuxImageDiskSize(const WebPMuxImage* const wpi);
|
|
|
|
// Total size of a list of images.
|
|
size_t MuxImageListDiskSize(const WebPMuxImage* wpi_list);
|
|
|
|
// Write out the given image into 'dst'.
|
|
uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst);
|
|
|
|
// Write out the given list of images into 'dst'.
|
|
uint8_t* MuxImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst);
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helper methods for mux.
|
|
|
|
// Checks if the given image list contains at least one lossless image.
|
|
int MuxHasLosslessImages(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.
|
|
// Return value is NULL if this chunk should be inserted in mux->images_ list
|
|
// or if 'id' is not known.
|
|
WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, WebPChunkId id);
|
|
|
|
// Validates that the given mux has a single image.
|
|
WebPMuxError MuxValidateForImage(const WebPMux* const mux);
|
|
|
|
// Validates the given mux object.
|
|
WebPMuxError MuxValidate(const WebPMux* const mux);
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
} // extern "C"
|
|
#endif
|
|
|
|
#endif /* WEBP_MUX_MUXI_H_ */
|