271 lines
8.6 KiB
C
271 lines
8.6 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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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 "../format_constants.h"
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#include "../mux.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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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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// 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, Loop, and other internally created chunks
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// like frame/tile 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 frame/tile chunk, alpha
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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_FRAME/WEBP_CHUNK_TILE.
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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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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* meta_;
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WebPChunk* loop_;
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WebPChunk* vp8x_;
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WebPChunk* unknown_;
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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_LOOP,
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IDX_FRAME,
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IDX_TILE,
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IDX_ALPHA,
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IDX_VP8,
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IDX_VP8L,
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IDX_META,
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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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#define MKFOURCC(a, b, c, d) ((uint32_t)(a) | (b) << 8 | (c) << 16 | (d) << 24)
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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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// Helper functions.
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// Read 16, 24 or 32 bits stored in little-endian order.
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static WEBP_INLINE int GetLE16(const uint8_t* const data) {
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return (int)(data[0] << 0) | (data[1] << 8);
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}
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static WEBP_INLINE int GetLE24(const uint8_t* const data) {
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return GetLE16(data) | (data[2] << 16);
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}
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static WEBP_INLINE uint32_t GetLE32(const uint8_t* const data) {
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return (uint32_t)GetLE16(data) | (GetLE16(data + 2) << 16);
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}
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// Store 16, 24 or 32 bits in little-endian order.
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static WEBP_INLINE void PutLE16(uint8_t* const data, int val) {
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assert(val < (1 << 16));
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data[0] = (val >> 0);
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data[1] = (val >> 8);
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}
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static WEBP_INLINE void PutLE24(uint8_t* const data, int val) {
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assert(val < (1 << 24));
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PutLE16(data, val & 0xffff);
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data[2] = (val >> 16);
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}
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static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) {
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PutLE16(data, (int)(val & 0xffff));
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PutLE16(data + 2, (int)(val >> 16));
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}
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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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//------------------------------------------------------------------------------
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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_NIL 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_NIL if not found.
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WebPChunkId ChunkGetIdFromTag(uint32_t tag);
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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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WebPMuxError ChunkSetNth(const 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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// 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 ChunksListDiskSize(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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// Get the width & height of image stored in 'image_chunk'.
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WebPMuxError MuxGetImageWidthHeight(const WebPChunk* const image_chunk,
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int* const width, int* const height);
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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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// Delete all images in 'wpi_list'.
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void MuxImageDeleteAll(WebPMuxImage** const wpi_list);
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// Count number of images matching the given tag id in the 'wpi_list'.
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int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id);
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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_FRAME:
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case WEBP_CHUNK_TILE:
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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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// Get a reference to appropriate chunk list within an image given chunk tag.
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static WEBP_INLINE WebPChunk** MuxImageGetListFromId(
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const WebPMuxImage* const wpi, WebPChunkId id) {
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assert(wpi != NULL);
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switch (id) {
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case WEBP_CHUNK_FRAME:
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case WEBP_CHUNK_TILE: return (WebPChunk**)&wpi->header_;
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case WEBP_CHUNK_ALPHA: return (WebPChunk**)&wpi->alpha_;
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case WEBP_CHUNK_IMAGE: return (WebPChunk**)&wpi->img_;
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default: return NULL;
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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 with given tag id.
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WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth,
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WebPChunkId id);
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// Get nth image in the image list with given tag id.
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WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth,
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WebPChunkId id, 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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// Total size of a list of images.
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size_t MuxImageListDiskSize(const WebPMuxImage* wpi_list);
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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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// Write out the given list of images into 'dst'.
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uint8_t* MuxImageListEmit(const WebPMuxImage* wpi_list, 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 lossless image.
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int MuxHasLosslessImages(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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// Return value is NULL if this chunk should be inserted in mux->images_ list
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// or if 'id' is not known.
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WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, WebPChunkId id);
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// Validates that the given mux has a single image.
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WebPMuxError MuxValidateForImage(const WebPMux* const mux);
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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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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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#endif /* WEBP_MUX_MUXI_H_ */
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