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Separate out mux and demux code and libraries:

Browse Source 
- Separate out mux.h and demux.h
- muxtypes.h: new header for data types common to mux/demux
- Move some misc read/write utilities to utils/utils.h
- Remove some duplicate methods.
- Separate out mux/demux libraries

Change-Id: If9b9569b10d55d922ad9317ef51710544315d6de
This commit is contained in:
Urvang Joshi
2012-11-19 11:21:37 -08:00
parent 90e5e3190c
commit 23782f95b4
20 changed files with 398 additions and 344 deletions
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3
src/Makefile.am
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@@ -2,6 +2,9 @@ SUBDIRS = dec enc dsp utils
if WANT_MUX
SUBDIRS += mux
endif
if WANT_DEMUX
SUBDIRS += demux
endif
AM_CPPFLAGS = -I$(top_srcdir)/src
lib_LTLIBRARIES = libwebp.la

2
src/dec/webp.c
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@@ -308,7 +308,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
// necessary to send VP8X chunk to the decoder.
return VP8_STATUS_BITSTREAM_ERROR;
}
if (has_alpha != NULL) *has_alpha = !!(flags & ALPHA_FLAG_BIT);
if (has_alpha != NULL) *has_alpha = !!(flags & ALPHA_FLAG);
if (found_vp8x && headers == NULL) {
return VP8_STATUS_OK; // Return features from VP8X header.
}

12
src/demux/Makefile.am Normal file
View File

@@ -0,0 +1,12 @@
AM_CPPFLAGS = -I$(top_srcdir)/src
lib_LTLIBRARIES = libwebpdemux.la
libwebpdemux_la_SOURCES =
libwebpdemux_la_SOURCES += demux.c
libwebpdemuxinclude_HEADERS =
libwebpdemuxinclude_HEADERS += ../webp/demux.h
libwebpdemuxinclude_HEADERS += ../webp/types.h
libwebpdemux_la_LDFLAGS = -version-info 0:0:0
libwebpdemuxincludedir = $(includedir)/webp

73
src/mux/demux.c → src/demux/demux.c
View File

@@ -8,20 +8,18 @@
// WebP container demux.
//
#include "../webp/mux.h"
#include <stdlib.h>
#include <string.h>
#include "../utils/utils.h"
#include "../webp/decode.h" // WebPGetInfo
#include "../webp/demux.h"
#include "../webp/format_constants.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#define MKFOURCC(a, b, c, d) ((uint32_t)(a) | (b) << 8 | (c) << 16 | (d) << 24)
typedef struct {
size_t start_; // start location of the data
size_t end_; // end location
@@ -129,43 +127,30 @@ static WEBP_INLINE const uint8_t* GetBuffer(MemBuffer* const mem) {
return mem->buf_ + mem->start_;
}
static WEBP_INLINE uint8_t GetByte(MemBuffer* const mem) {
// Read from 'mem' and skip the read bytes.
static WEBP_INLINE uint8_t ReadByte(MemBuffer* const mem) {
const uint8_t byte = mem->buf_[mem->start_];
Skip(mem, 1);
return byte;
}
// Read 16, 24 or 32 bits stored in little-endian order.
static WEBP_INLINE int ReadLE16s(const uint8_t* const data) {
return (int)(data[0] << 0) | (data[1] << 8);
}
static WEBP_INLINE int ReadLE24s(const uint8_t* const data) {
return ReadLE16s(data) | (data[2] << 16);
}
static WEBP_INLINE uint32_t ReadLE32(const uint8_t* const data) {
return (uint32_t)ReadLE24s(data) | (data[3] << 24);
}
// In addition to reading, skip the read bytes.
static WEBP_INLINE int GetLE16s(MemBuffer* const mem) {
static WEBP_INLINE int ReadLE16s(MemBuffer* const mem) {
const uint8_t* const data = mem->buf_ + mem->start_;
const int val = ReadLE16s(data);
const int val = GetLE16(data);
Skip(mem, 2);
return val;
}
static WEBP_INLINE int GetLE24s(MemBuffer* const mem) {
static WEBP_INLINE int ReadLE24s(MemBuffer* const mem) {
const uint8_t* const data = mem->buf_ + mem->start_;
const int val = ReadLE24s(data);
const int val = GetLE24(data);
Skip(mem, 3);
return val;
}
static WEBP_INLINE uint32_t GetLE32(MemBuffer* const mem) {
static WEBP_INLINE uint32_t ReadLE32(MemBuffer* const mem) {
const uint8_t* const data = mem->buf_ + mem->start_;
const uint32_t val = ReadLE32(data);
const uint32_t val = GetLE32(data);
Skip(mem, 4);
return val;
}
@@ -207,8 +192,8 @@ static ParseStatus StoreFrame(int frame_num, uint32_t min_size,
do {
const size_t chunk_start_offset = mem->start_;
const uint32_t fourcc = GetLE32(mem);
const uint32_t payload_size = GetLE32(mem);
const uint32_t fourcc = ReadLE32(mem);
const uint32_t payload_size = ReadLE32(mem);
const uint32_t payload_size_padded = payload_size + (payload_size & 1);
const size_t payload_available = (payload_size_padded > MemDataSize(mem))
? MemDataSize(mem) : payload_size_padded;
@@ -300,12 +285,12 @@ static ParseStatus ParseFrame(
NewFrame(mem, ANMF_CHUNK_SIZE, frame_chunk_size, &frame);
if (status != PARSE_OK) return status;
frame->x_offset_ = 2 * GetLE24s(mem);
frame->y_offset_ = 2 * GetLE24s(mem);
frame->width_ = 1 + GetLE24s(mem);
frame->height_ = 1 + GetLE24s(mem);
frame->duration_ = GetLE24s(mem);
frame->dispose_method_ = (WebPMuxAnimDispose)(GetByte(mem) & 1);
frame->x_offset_ = 2 * ReadLE24s(mem);
frame->y_offset_ = 2 * ReadLE24s(mem);
frame->width_ = 1 + ReadLE24s(mem);
frame->height_ = 1 + ReadLE24s(mem);
frame->duration_ = ReadLE24s(mem);
frame->dispose_method_ = (WebPMuxAnimDispose)(ReadByte(mem) & 1);
if (frame->width_ * (uint64_t)frame->height_ >= MAX_IMAGE_AREA) {
return PARSE_ERROR;
}
@@ -340,8 +325,8 @@ static ParseStatus ParseFragment(WebPDemuxer* const dmux,
if (status != PARSE_OK) return status;
frame->is_fragment_ = 1;
frame->x_offset_ = 2 * GetLE24s(mem);
frame->y_offset_ = 2 * GetLE24s(mem);
frame->x_offset_ = 2 * ReadLE24s(mem);
frame->y_offset_ = 2 * ReadLE24s(mem);
// Store a fragment only if the fragments flag is set and all data for this
// fragment is available.
@@ -386,7 +371,7 @@ static int ReadHeader(MemBuffer* const mem) {
return 0;
}
riff_size = ReadLE32(GetBuffer(mem) + TAG_SIZE);
riff_size = GetLE32(GetBuffer(mem) + TAG_SIZE);
if (riff_size < CHUNK_HEADER_SIZE) return 0;
if (riff_size > MAX_CHUNK_PAYLOAD) return 0;
@@ -449,17 +434,17 @@ static ParseStatus ParseVP8X(WebPDemuxer* const dmux) {
dmux->is_ext_format_ = 1;
Skip(mem, TAG_SIZE); // VP8X
vp8x_size = GetLE32(mem);
vp8x_size = ReadLE32(mem);
if (vp8x_size > MAX_CHUNK_PAYLOAD) return PARSE_ERROR;
if (vp8x_size < VP8X_CHUNK_SIZE) return PARSE_ERROR;
vp8x_size += vp8x_size & 1;
if (SizeIsInvalid(mem, vp8x_size)) return PARSE_ERROR;
if (MemDataSize(mem) < vp8x_size) return PARSE_NEED_MORE_DATA;
dmux->feature_flags_ = GetByte(mem);
dmux->feature_flags_ = ReadByte(mem);
Skip(mem, 3); // Reserved.
dmux->canvas_width_ = 1 + GetLE24s(mem);
dmux->canvas_height_ = 1 + GetLE24s(mem);
dmux->canvas_width_ = 1 + ReadLE24s(mem);
dmux->canvas_height_ = 1 + ReadLE24s(mem);
if (dmux->canvas_width_ * (uint64_t)dmux->canvas_height_ >= MAX_IMAGE_AREA) {
return PARSE_ERROR; // image final dimension is too large
}
@@ -472,8 +457,8 @@ static ParseStatus ParseVP8X(WebPDemuxer* const dmux) {
do {
int store_chunk = 1;
const size_t chunk_start_offset = mem->start_;
const uint32_t fourcc = GetLE32(mem);
const uint32_t chunk_size = GetLE32(mem);
const uint32_t fourcc = ReadLE32(mem);
const uint32_t chunk_size = ReadLE32(mem);
const uint32_t chunk_size_padded = chunk_size + (chunk_size & 1);
if (chunk_size > MAX_CHUNK_PAYLOAD) return PARSE_ERROR;
@@ -497,8 +482,8 @@ static ParseStatus ParseVP8X(WebPDemuxer* const dmux) {
status = PARSE_NEED_MORE_DATA;
} else if (anim_chunks == 0) {
++anim_chunks;
dmux->bgcolor_ = GetLE32(mem);
dmux->loop_count_ = GetLE16s(mem);
dmux->bgcolor_ = ReadLE32(mem);
dmux->loop_count_ = ReadLE16s(mem);
Skip(mem, chunk_size_padded - ANIM_CHUNK_SIZE);
} else {
store_chunk = 0;

15
src/enc/syntax.c
View File

@@ -11,6 +11,7 @@
#include <assert.h>
#include "../utils/utils.h"
#include "../webp/format_constants.h"
#include "./vp8enci.h"
@@ -21,18 +22,6 @@ extern "C" {
//------------------------------------------------------------------------------
// Helper functions
// TODO(later): Move to webp/format_constants.h?
static void PutLE24(uint8_t* const data, uint32_t val) {
data[0] = (val >> 0) & 0xff;
data[1] = (val >> 8) & 0xff;
data[2] = (val >> 16) & 0xff;
}
static void PutLE32(uint8_t* const data, uint32_t val) {
PutLE24(data, val);
data[3] = (val >> 24) & 0xff;
}
static int IsVP8XNeeded(const VP8Encoder* const enc) {
return !!enc->has_alpha_; // Currently the only case when VP8X is needed.
// This could change in the future.
@@ -73,7 +62,7 @@ static WebPEncodingError PutVP8XHeader(const VP8Encoder* const enc) {
assert(pic->width <= MAX_CANVAS_SIZE && pic->height <= MAX_CANVAS_SIZE);
if (enc->has_alpha_) {
flags |= ALPHA_FLAG_BIT;
flags |= ALPHA_FLAG;
}
PutLE32(vp8x + TAG_SIZE, VP8X_CHUNK_SIZE);

7
src/enc/vp8l.c
View File

@@ -712,13 +712,6 @@ static int ApplyCrossColorFilter(const VP8LEncoder* const enc,
// -----------------------------------------------------------------------------
static void PutLE32(uint8_t* const data, uint32_t val) {
data[0] = (val >> 0) & 0xff;
data[1] = (val >> 8) & 0xff;
data[2] = (val >> 16) & 0xff;
data[3] = (val >> 24) & 0xff;
}
static WebPEncodingError WriteRiffHeader(const WebPPicture* const pic,
size_t riff_size, size_t vp8l_size) {
uint8_t riff[RIFF_HEADER_SIZE + CHUNK_HEADER_SIZE + VP8L_SIGNATURE_SIZE] = {

1
src/mux/Makefile.am
View File

@@ -2,7 +2,6 @@ AM_CPPFLAGS = -I$(top_srcdir)/src
lib_LTLIBRARIES = libwebpmux.la
libwebpmux_la_SOURCES =
libwebpmux_la_SOURCES += demux.c
libwebpmux_la_SOURCES += muxedit.c
libwebpmux_la_SOURCES += muxi.h
libwebpmux_la_SOURCES += muxinternal.c

1
src/mux/muxedit.c
View File

@@ -12,6 +12,7 @@
#include <assert.h>
#include "./muxi.h"
#include "../utils/utils.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {

46
src/mux/muxi.h
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@@ -15,7 +15,6 @@
#include <stdlib.h>
#include "../dec/vp8i.h"
#include "../dec/vp8li.h"
#include "../webp/format_constants.h"
#include "../webp/mux.h"
#if defined(__cplusplus) || defined(c_plusplus)
@@ -82,8 +81,6 @@ typedef enum {
#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;
@@ -92,44 +89,6 @@ typedef struct {
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.
@@ -167,6 +126,11 @@ WebPChunk* ChunkRelease(WebPChunk* const chunk);
// Deletes given chunk & returns chunk->next_.
WebPChunk* ChunkDelete(WebPChunk* const chunk);
// 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;

30
src/mux/muxinternal.c
View File

@@ -12,6 +12,7 @@
#include <assert.h>
#include "./muxi.h"
#include "../utils/utils.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
@@ -220,35 +221,6 @@ uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst) {
return dst;
}
//------------------------------------------------------------------------------
// Manipulation of a WebPData object.
void WebPDataInit(WebPData* webp_data) {
if (webp_data != NULL) {
memset(webp_data, 0, sizeof(*webp_data));
}
}
void WebPDataClear(WebPData* webp_data) {
if (webp_data != NULL) {
free((void*)webp_data->bytes);
WebPDataInit(webp_data);
}
}
int WebPDataCopy(const WebPData* src, WebPData* dst) {
if (src == NULL || dst == NULL) return 0;
WebPDataInit(dst);
if (src->bytes != NULL && src->size != 0) {
dst->bytes = (uint8_t*)malloc(src->size);
if (dst->bytes == NULL) return 0;
memcpy((void*)dst->bytes, src->bytes, src->size);
dst->size = src->size;
}
return 1;
}
//------------------------------------------------------------------------------
// Life of a MuxImage object.

1
src/mux/muxread.c
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@@ -12,6 +12,7 @@
#include <assert.h>
#include "./muxi.h"
#include "../utils/utils.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {

39
src/utils/utils.h
View File

@@ -7,11 +7,14 @@
//
// Misc. common utility functions
//
// Author: Skal (pascal.massimino@gmail.com)
// Authors: Skal (pascal.massimino@gmail.com)
// Urvang (urvang@google.com)
#ifndef WEBP_UTILS_UTILS_H_
#define WEBP_UTILS_UTILS_H_
#include <assert.h>
#include "../webp/types.h"
#if defined(__cplusplus) || defined(c_plusplus)
@@ -35,6 +38,40 @@ void* WebPSafeMalloc(uint64_t nmemb, size_t size);
// in order to favor the "calloc(num_foo, sizeof(foo))" pattern.
void* WebPSafeCalloc(uint64_t nmemb, size_t size);
//------------------------------------------------------------------------------
// Reading/writing data.
// 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));
}
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)

171
src/webp/demux.h Normal file
View File

@@ -0,0 +1,171 @@
// Copyright 2012 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/
// -----------------------------------------------------------------------------
//
// Demux API.
// Enables extraction of image and extended format data from WebP files.
// TODO(urvang): Add an example code snippet (similar to mux.h).
#ifndef WEBP_WEBP_DEMUX_H_
#define WEBP_WEBP_DEMUX_H_
#include "./format_constants.h"
#include "./mux_types.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#define WEBP_DEMUX_ABI_VERSION 0x0100 // MAJOR(8b) + MINOR(8b)
typedef struct WebPDemuxer WebPDemuxer;
#if !(defined(__cplusplus) || defined(c_plusplus))
typedef enum WebPDemuxState WebPDemuxState;
typedef enum WebPFormatFeature WebPFormatFeature;
#endif
typedef struct WebPIterator WebPIterator;
typedef struct WebPChunkIterator WebPChunkIterator;
//------------------------------------------------------------------------------
// Life of a Demux object
enum WebPDemuxState {
WEBP_DEMUX_PARSING_HEADER, // Not enough data to parse full header.
WEBP_DEMUX_PARSED_HEADER, // Header parsing complete, data may be available.
WEBP_DEMUX_DONE // Entire file has been parsed.
};
// Internal, version-checked, entry point
WEBP_EXTERN(WebPDemuxer*) WebPDemuxInternal(
const WebPData*, int, WebPDemuxState*, int);
// Parses the WebP file given by 'data'.
// A complete WebP file must be present in 'data' for the function to succeed.
// Returns a WebPDemuxer object on successful parse, NULL otherwise.
static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
return WebPDemuxInternal(data, 0, NULL, WEBP_DEMUX_ABI_VERSION);
}
// Parses the WebP file given by 'data'.
// If 'state' is non-NULL it will be set to indicate the status of the demuxer.
// Returns a WebPDemuxer object on successful parse, NULL otherwise.
static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
const WebPData* data, WebPDemuxState* state) {
return WebPDemuxInternal(data, 1, state, WEBP_DEMUX_ABI_VERSION);
}
// Frees memory associated with 'dmux'.
WEBP_EXTERN(void) WebPDemuxDelete(WebPDemuxer* dmux);
//------------------------------------------------------------------------------
// Data/information extraction.
enum WebPFormatFeature {
WEBP_FF_FORMAT_FLAGS, // Extended format flags present in the 'VP8X' chunk.
WEBP_FF_CANVAS_WIDTH,
WEBP_FF_CANVAS_HEIGHT,
WEBP_FF_LOOP_COUNT,
WEBP_FF_BACKGROUND_COLOR
};
// Get the 'feature' value from the 'dmux'.
// NOTE: values are only valid if WebPDemux() was used or WebPDemuxPartial()
// returned a state > WEBP_DEMUX_PARSING_HEADER.
WEBP_EXTERN(uint32_t) WebPDemuxGetI(
const WebPDemuxer* dmux, WebPFormatFeature feature);
//------------------------------------------------------------------------------
// Frame iteration.
struct WebPIterator {
int frame_num;
int num_frames;
int fragment_num;
int num_fragments;
int x_offset, y_offset; // offset relative to the canvas.
int width, height; // dimensions of this frame or fragment.
int duration; // display duration in milliseconds.
WebPMuxAnimDispose dispose_method; // dispose method for the frame.
int complete; // true if 'fragment' contains a full frame. partial images
// may still be decoded with the WebP incremental decoder.
WebPData fragment; // The frame or fragment given by 'frame_num' and
// 'fragment_num'.
uint32_t pad[4]; // padding for later use.
void* private_; // for internal use only.
};
// Retrieves frame 'frame_number' from 'dmux'.
// 'iter->fragment' points to the first fragment on return from this function.
// Individual fragments may be extracted using WebPDemuxSetFragment().
// Setting 'frame_number' equal to 0 will return the last frame of the image.
// Returns false if 'dmux' is NULL or frame 'frame_number' is not present.
// Call WebPDemuxReleaseIterator() when use of the iterator is complete.
// NOTE: 'dmux' must persist for the lifetime of 'iter'.
WEBP_EXTERN(int) WebPDemuxGetFrame(
const WebPDemuxer* dmux, int frame_number, WebPIterator* iter);
// Sets 'iter->fragment' to point to the next ('iter->frame_num' + 1) or
// previous ('iter->frame_num' - 1) frame. These functions do not loop.
// Returns true on success, false otherwise.
WEBP_EXTERN(int) WebPDemuxNextFrame(WebPIterator* iter);
WEBP_EXTERN(int) WebPDemuxPrevFrame(WebPIterator* iter);
// Sets 'iter->fragment' to reflect fragment number 'fragment_num'.
// Returns true if fragment 'fragment_num' is present, false otherwise.
WEBP_EXTERN(int) WebPDemuxSelectFragment(WebPIterator* iter, int fragment_num);
// Releases any memory associated with 'iter'.
// Must be called before destroying the associated WebPDemuxer with
// WebPDemuxDelete().
WEBP_EXTERN(void) WebPDemuxReleaseIterator(WebPIterator* iter);
//------------------------------------------------------------------------------
// Chunk iteration.
struct WebPChunkIterator {
// The current and total number of chunks with the fourcc given to
// WebPDemuxGetChunk().
int chunk_num;
int num_chunks;
WebPData chunk; // The payload of the chunk.
uint32_t pad[6]; // padding for later use
void* private_;
};
// Retrieves the 'chunk_number' instance of the chunk with id 'fourcc' from
// 'dmux'.
// 'fourcc' is a character array containing the fourcc of the chunk to return,
// e.g., "ICCP", "XMP ", "EXIF", etc.
// Setting 'chunk_number' equal to 0 will return the last chunk in a set.
// Returns true if the chunk is found, false otherwise. Image related chunk
// payloads are accessed through WebPDemuxGetFrame() and related functions.
// Call WebPDemuxReleaseChunkIterator() when use of the iterator is complete.
// NOTE: 'dmux' must persist for the lifetime of the iterator.
WEBP_EXTERN(int) WebPDemuxGetChunk(const WebPDemuxer* dmux,
const char fourcc[4], int chunk_number,
WebPChunkIterator* iter);
// Sets 'iter->chunk' to point to the next ('iter->chunk_num' + 1) or previous
// ('iter->chunk_num' - 1) chunk. These functions do not loop.
// Returns true on success, false otherwise.
WEBP_EXTERN(int) WebPDemuxNextChunk(WebPChunkIterator* iter);
WEBP_EXTERN(int) WebPDemuxPrevChunk(WebPChunkIterator* iter);
// Releases any memory associated with 'iter'.
// Must be called before destroying the associated WebPDemuxer with
// WebPDemuxDelete().
WEBP_EXTERN(void) WebPDemuxReleaseChunkIterator(WebPChunkIterator* iter);
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
#endif /* WEBP_WEBP_DEMUX_H_ */

20
src/webp/format_constants.h
View File

@@ -70,14 +70,18 @@ typedef enum {
#define FRGM_CHUNK_SIZE 6 // Size of a FRGM chunk.
#define VP8X_CHUNK_SIZE 10 // Size of a VP8X chunk.
// VP8X Feature Flags. These should be the same as the corresponding values in
// the 'WebPFeatureFlags' enum defined in mux.h.
#define FRAGMENTS_FLAG_BIT 0x01
#define ANIMATION_FLAG_BIT 0x02
#define XMP_FLAG_BIT 0x04
#define EXIF_FLAG_BIT 0x08
#define ALPHA_FLAG_BIT 0x10
#define ICC_FLAG_BIT 0x20
// VP8X Feature Flags.
#if !(defined(__cplusplus) || defined(c_plusplus))
typedef enum WebPFeatureFlags WebPFeatureFlags;
#endif
enum WebPFeatureFlags {
FRAGMENTS_FLAG = 0x00000001,
ANIMATION_FLAG = 0x00000002,
XMP_FLAG = 0x00000004,
EXIF_FLAG = 0x00000008,
ALPHA_FLAG = 0x00000010,
ICCP_FLAG = 0x00000020
};
#define MAX_CANVAS_SIZE (1 << 24) // 24-bit max for VP8X width/height.
#define MAX_IMAGE_AREA (1ULL << 32) // 32-bit max for width x height.

190
src/webp/mux.h
View File

@@ -45,7 +45,8 @@
#ifndef WEBP_WEBP_MUX_H_
#define WEBP_WEBP_MUX_H_
#include "./types.h"
#include "./format_constants.h"
#include "./mux_types.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
@@ -54,24 +55,13 @@ extern "C" {
#define WEBP_MUX_ABI_VERSION 0x0100 // MAJOR(8b) + MINOR(8b)
typedef struct WebPMux WebPMux; // main opaque object.
typedef struct WebPData WebPData;
#if !(defined(__cplusplus) || defined(c_plusplus))
typedef enum WebPMuxError WebPMuxError;
typedef enum WebPFeatureFlags WebPFeatureFlags;
typedef enum WebPChunkId WebPChunkId;
typedef enum WebPMuxAnimDispose WebPMuxAnimDispose;
#endif
typedef struct WebPMuxFrameInfo WebPMuxFrameInfo;
typedef struct WebPMuxAnimParams WebPMuxAnimParams;
typedef struct WebPDemuxer WebPDemuxer;
#if !(defined(__cplusplus) || defined(c_plusplus))
typedef enum WebPDemuxState WebPDemuxState;
typedef enum WebPFormatFeature WebPFormatFeature;
#endif
typedef struct WebPIterator WebPIterator;
typedef struct WebPChunkIterator WebPChunkIterator;
// Error codes
enum WebPMuxError {
WEBP_MUX_OK = 1,
@@ -82,16 +72,6 @@ enum WebPMuxError {
WEBP_MUX_NOT_ENOUGH_DATA = -4
};
// Flag values for different features used in VP8X chunk.
enum WebPFeatureFlags {
FRAGMENTS_FLAG = 0x00000001,
ANIMATION_FLAG = 0x00000002,
XMP_FLAG = 0x00000004,
EXIF_FLAG = 0x00000008,
ALPHA_FLAG = 0x00000010,
ICCP_FLAG = 0x00000020
};
// IDs for different types of chunks.
enum WebPChunkId {
WEBP_CHUNK_VP8X, // VP8X
@@ -107,27 +87,6 @@ enum WebPChunkId {
WEBP_CHUNK_NIL
};
// Data type used to describe 'raw' data, e.g., chunk data
// (ICC profile, metadata) and WebP compressed image data.
struct WebPData {
const uint8_t* bytes;
size_t size;
};
//------------------------------------------------------------------------------
// Manipulation of a WebPData object.
// Initializes the contents of the 'webp_data' object with default values.
WEBP_EXTERN(void) WebPDataInit(WebPData* webp_data);
// Clears the contents of the 'webp_data' object by calling free(). Does not
// deallocate the object itself.
WEBP_EXTERN(void) WebPDataClear(WebPData* webp_data);
// Allocates necessary storage for 'dst' and copies the contents of 'src'.
// Returns true on success.
WEBP_EXTERN(int) WebPDataCopy(const WebPData* src, WebPData* dst);
//------------------------------------------------------------------------------
// Life of a Mux object
@@ -222,13 +181,6 @@ WEBP_EXTERN(WebPMuxError) WebPMuxDeleteChunk(
//------------------------------------------------------------------------------
// Images.
// Dispose method (animation only). Indicates how the area used by the current
// frame is to be treated before rendering the next frame on the canvas.
enum WebPMuxAnimDispose {
WEBP_MUX_DISPOSE_NONE, // Do not dispose.
WEBP_MUX_DISPOSE_BACKGROUND // Dispose to background color.
};
// Encapsulates data about a single frame/fragment.
struct WebPMuxFrameInfo {
WebPData bitstream; // image data: can either be a raw VP8/VP8L bitstream
@@ -389,144 +341,6 @@ WEBP_EXTERN(WebPMuxError) WebPMuxNumChunks(const WebPMux* mux,
WEBP_EXTERN(WebPMuxError) WebPMuxAssemble(WebPMux* mux,
WebPData* assembled_data);
//------------------------------------------------------------------------------
// Demux API.
// Enables extraction of image and extended format data from WebP files.
#define WEBP_DEMUX_ABI_VERSION 0x0100 // MAJOR(8b) + MINOR(8b)
enum WebPDemuxState {
WEBP_DEMUX_PARSING_HEADER, // Not enough data to parse full header.
WEBP_DEMUX_PARSED_HEADER, // Header parsing complete, data may be available.
WEBP_DEMUX_DONE // Entire file has been parsed.
};
//------------------------------------------------------------------------------
// Life of a Demux object
// Internal, version-checked, entry point
WEBP_EXTERN(WebPDemuxer*) WebPDemuxInternal(
const WebPData*, int, WebPDemuxState*, int);
// Parses the WebP file given by 'data'.
// A complete WebP file must be present in 'data' for the function to succeed.
// Returns a WebPDemuxer object on successful parse, NULL otherwise.
static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
return WebPDemuxInternal(data, 0, NULL, WEBP_DEMUX_ABI_VERSION);
}
// Parses the WebP file given by 'data'.
// If 'state' is non-NULL it will be set to indicate the status of the demuxer.
// Returns a WebPDemuxer object on successful parse, NULL otherwise.
static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
const WebPData* data, WebPDemuxState* state) {
return WebPDemuxInternal(data, 1, state, WEBP_DEMUX_ABI_VERSION);
}
// Frees memory associated with 'dmux'.
WEBP_EXTERN(void) WebPDemuxDelete(WebPDemuxer* dmux);
//------------------------------------------------------------------------------
// Data/information extraction.
enum WebPFormatFeature {
WEBP_FF_FORMAT_FLAGS, // Extended format flags present in the 'VP8X' chunk.
WEBP_FF_CANVAS_WIDTH,
WEBP_FF_CANVAS_HEIGHT,
WEBP_FF_LOOP_COUNT,
WEBP_FF_BACKGROUND_COLOR
};
// Get the 'feature' value from the 'dmux'.
// NOTE: values are only valid if WebPDemux() was used or WebPDemuxPartial()
// returned a state > WEBP_DEMUX_PARSING_HEADER.
WEBP_EXTERN(uint32_t) WebPDemuxGetI(
const WebPDemuxer* dmux, WebPFormatFeature feature);
//------------------------------------------------------------------------------
// Frame iteration.
struct WebPIterator {
int frame_num;
int num_frames;
int fragment_num;
int num_fragments;
int x_offset, y_offset; // offset relative to the canvas.
int width, height; // dimensions of this frame or fragment.
int duration; // display duration in milliseconds.
WebPMuxAnimDispose dispose_method; // dispose method for the frame.
int complete; // true if 'fragment' contains a full frame. partial images
// may still be decoded with the WebP incremental decoder.
WebPData fragment; // The frame or fragment given by 'frame_num' and
// 'fragment_num'.
uint32_t pad[4]; // padding for later use.
void* private_; // for internal use only.
};
// Retrieves frame 'frame_number' from 'dmux'.
// 'iter->fragment' points to the first fragment on return from this function.
// Individual fragments may be extracted using WebPDemuxSetFragment().
// Setting 'frame_number' equal to 0 will return the last frame of the image.
// Returns false if 'dmux' is NULL or frame 'frame_number' is not present.
// Call WebPDemuxReleaseIterator() when use of the iterator is complete.
// NOTE: 'dmux' must persist for the lifetime of 'iter'.
WEBP_EXTERN(int) WebPDemuxGetFrame(
const WebPDemuxer* dmux, int frame_number, WebPIterator* iter);
// Sets 'iter->fragment' to point to the next ('iter->frame_num' + 1) or
// previous ('iter->frame_num' - 1) frame. These functions do not loop.
// Returns true on success, false otherwise.
WEBP_EXTERN(int) WebPDemuxNextFrame(WebPIterator* iter);
WEBP_EXTERN(int) WebPDemuxPrevFrame(WebPIterator* iter);
// Sets 'iter->fragment' to reflect fragment number 'fragment_num'.
// Returns true if fragment 'fragment_num' is present, false otherwise.
WEBP_EXTERN(int) WebPDemuxSelectFragment(WebPIterator* iter, int fragment_num);
// Releases any memory associated with 'iter'.
// Must be called before destroying the associated WebPDemuxer with
// WebPDemuxDelete().
WEBP_EXTERN(void) WebPDemuxReleaseIterator(WebPIterator* iter);
//------------------------------------------------------------------------------
// Chunk iteration.
struct WebPChunkIterator {
// The current and total number of chunks with the fourcc given to
// WebPDemuxGetChunk().
int chunk_num;
int num_chunks;
WebPData chunk; // The payload of the chunk.
uint32_t pad[6]; // padding for later use
void* private_;
};
// Retrieves the 'chunk_number' instance of the chunk with id 'fourcc' from
// 'dmux'.
// 'fourcc' is a character array containing the fourcc of the chunk to return,
// e.g., "ICCP", "XMP ", "EXIF", etc.
// Setting 'chunk_number' equal to 0 will return the last chunk in a set.
// Returns true if the chunk is found, false otherwise. Image related chunk
// payloads are accessed through WebPDemuxGetFrame() and related functions.
// Call WebPDemuxReleaseChunkIterator() when use of the iterator is complete.
// NOTE: 'dmux' must persist for the lifetime of the iterator.
WEBP_EXTERN(int) WebPDemuxGetChunk(const WebPDemuxer* dmux,
const char fourcc[4], int chunk_number,
WebPChunkIterator* iter);
// Sets 'iter->chunk' to point to the next ('iter->chunk_num' + 1) or previous
// ('iter->chunk_num' - 1) chunk. These functions do not loop.
// Returns true on success, false otherwise.
WEBP_EXTERN(int) WebPDemuxNextChunk(WebPChunkIterator* iter);
WEBP_EXTERN(int) WebPDemuxPrevChunk(WebPChunkIterator* iter);
// Releases any memory associated with 'iter'.
// Must be called before destroying the associated WebPDemuxer with
// WebPDemuxDelete().
WEBP_EXTERN(void) WebPDemuxReleaseChunkIterator(WebPChunkIterator* iter);
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)

78
src/webp/mux_types.h Normal file
View File

@@ -0,0 +1,78 @@
// Copyright 2012 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 some common data-types used by mux and demux libraries.
//
// Author: Urvang (urvang@google.com)
#ifndef WEBP_WEBP_MUX_TYPES_H_
#define WEBP_WEBP_MUX_TYPES_H_
#include <stdlib.h> // free()
#include <string.h> // memset()
#include "./types.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
// Create fourcc of the chunk from the chunk tag characters.
#define MKFOURCC(a, b, c, d) ((uint32_t)(a) | (b) << 8 | (c) << 16 | (d) << 24)
// Dispose method (animation only). Indicates how the area used by the current
// frame is to be treated before rendering the next frame on the canvas.
#if !(defined(__cplusplus) || defined(c_plusplus))
typedef enum WebPMuxAnimDispose WebPMuxAnimDispose;
#endif
enum WebPMuxAnimDispose {
WEBP_MUX_DISPOSE_NONE, // Do not dispose.
WEBP_MUX_DISPOSE_BACKGROUND // Dispose to background color.
};
// Data type used to describe 'raw' data, e.g., chunk data
// (ICC profile, metadata) and WebP compressed image data.
typedef struct WebPData WebPData;
struct WebPData {
const uint8_t* bytes;
size_t size;
};
// Initializes the contents of the 'webp_data' object with default values.
static WEBP_INLINE void WebPDataInit(WebPData* webp_data) {
if (webp_data != NULL) {
memset(webp_data, 0, sizeof(*webp_data));
}
}
// Clears the contents of the 'webp_data' object by calling free(). Does not
// deallocate the object itself.
static WEBP_INLINE void WebPDataClear(WebPData* webp_data) {
if (webp_data != NULL) {
free((void*)webp_data->bytes);
WebPDataInit(webp_data);
}
}
// Allocates necessary storage for 'dst' and copies the contents of 'src'.
// Returns true on success.
static WEBP_INLINE int WebPDataCopy(const WebPData* src, WebPData* dst) {
if (src == NULL || dst == NULL) return 0;
WebPDataInit(dst);
if (src->bytes != NULL && src->size != 0) {
dst->bytes = (uint8_t*)malloc(src->size);
if (dst->bytes == NULL) return 0;
memcpy((void*)dst->bytes, src->bytes, src->size);
dst->size = src->size;
}
return 1;
}
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
#endif /* WEBP_WEBP_MUX_TYPES_H_ */