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Chunk fourCCs for XMP/EXIF

Browse Source 
Use separate fourCCs "XMP " and "EXIF" instead of a common "META"
Also, some refactorization in webpmux.c

Change-Id: Iad3337e5c1b81e785c60670ce28b1f536dd7ee31
This commit is contained in:
Urvang Joshi 2012-10-31 16:30:41 -07:00
parent 52ad1979d2
commit f903cbab9a
11 changed files with 208 additions and 147 deletions
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43
README.mux
View File

@ -8,7 +8,7 @@ Description:
============
WebP Mux: library to create a WebP container object for features like
color profile, metadata, animation & tiling. A reference command line
color profile, metadata, animation and tiling. A reference command line
tool 'webpmux' and WebP container specification 'doc/webp-container-spec.txt'
are also provided in this package.
@ -32,56 +32,63 @@ Usage: webpmux -get GET_OPTIONS INPUT -o OUTPUT
GET_OPTIONS:
Extract relevant data.
icc Get ICCP Color profile.
meta Get XMP/EXIF metadata.
icc Get ICC profile.
exif Get EXIF metadata.
xmp Get XMP metadata.
tile n Get nth tile.
frame n Get nth frame.
SET_OPTIONS:
Set color profile/metadata.
icc file.icc Set ICC Color profile.
meta file.meta Set XMP/EXIF metadata.
where: 'file.icc' contains the color profile to be set,
'file.meta' contains the metadata to be set
icc file.icc Set ICC profile.
exif file.exif Set EXIF metadata.
xmp file.xmp Set XMP metadata.
where: 'file.icc' contains the ICC profile to be set,
'file.exif' contains the EXIF metadata to be set and
'file.xmp' contains the XMP metadata to be set
STRIP_OPTIONS:
Strip color profile/metadata.
icc Strip ICCP color profile.
meta Strip XMP/EXIF metadata.
icc Strip ICC profile.
exif Strip EXIF metadata.
xmp Strip XMP metadata.
TILE_OPTIONS(i):
Create tiled image.
file_i +xi+yi
where: 'file_i' is the i'th tile (webp format),
where: 'file_i' is the i'th tile (WebP format),
'xi','yi' specify the image offset for this tile.
FRAME_OPTIONS(i):
Create animation.
file_i +xi+yi+di
where: 'file_i' is the i'th animation frame (webp format),
where: 'file_i' is the i'th animation frame (WebP format),
'xi','yi' specify the image offset for this frame.
'di' is the pause duration before next frame.
INPUT & OUTPUT are in webp format.
INPUT and OUTPUT are in WebP format.
Note: The nature of EXIF, XMP and ICC data is not checked and is assumed to be
valid.
WebP Mux API:
==============
The WebP Mux API contains methods for adding data to and reading data from
WebPMux (a WebP container object). This API currently supports XMP/EXIF
metadata, ICC color profile, animation & tiling. Other features will be added in
subsequent releases.
metadata, ICC profile, animation and tiling. Other features will be added
in subsequent releases.
Example#1 (pseudo code): Creating a WebPMux object with image data, color
profile & XMP metadata.
profile and XMP metadata.
int copy_data = 0;
WebPMux* mux = WebPMuxNew();
// ... (Prepare image data).
WebPMuxSetImage(mux, &image, copy_data);
// ... (Prepare ICCP color profile data).
// ... (Prepare ICC profile data).
WebPMuxSetChunk(mux, "ICCP", &icc_profile, copy_data);
// ... (Prepare XMP metadata).
WebPMuxSetChunk(mux, "META", &xmp, copy_data);
WebPMuxSetChunk(mux, "XMP ", &xmp, copy_data);
// Get data from mux in WebP RIFF format.
WebPMuxAssemble(mux, &output_data);
WebPMuxDelete(mux);
@ -89,7 +96,7 @@ profile & XMP metadata.
WebPDataClear(&output_data);
Example#2 (pseudo code): Get image & color profile data from a WebP file.
Example#2 (pseudo code): Get image and color profile data from a WebP file.
int copy_data = 0;
// ... (Read data from file).

155
examples/webpmux.c
View File

@ -31,17 +31,20 @@
-o out_animation_container.webp
webpmux -set icc image_profile.icc in.webp -o out_icc_container.webp
webpmux -set meta image_metadata.meta in.webp -o out_meta_container.webp
webpmux -set exif image_metadata.exif in.webp -o out_exif_container.webp
webpmux -set xmp image_metadata.xmp in.webp -o out_xmp_container.webp
Extract relevant data from WebP container file:
webpmux -get tile n in.webp -o out_tile.webp
webpmux -get frame n in.webp -o out_frame.webp
webpmux -get icc in.webp -o image_profile.icc
webpmux -get meta in.webp -o image_metadata.meta
webpmux -get exif in.webp -o image_metadata.exif
webpmux -get xmp in.webp -o image_metadata.xmp
Strip data from WebP Container file:
webpmux -strip icc in.webp -o out.webp
webpmux -strip meta in.webp -o out.webp
webpmux -strip exif in.webp -o out.webp
webpmux -strip xmp in.webp -o out.webp
Misc:
webpmux -info in.webp
@ -81,12 +84,23 @@ typedef struct {
typedef enum {
NIL_FEATURE = 0,
FEATURE_META,
FEATURE_EXIF,
FEATURE_XMP,
FEATURE_ICCP,
FEATURE_FRM,
FEATURE_TILE
FEATURE_TILE,
LAST_FEATURE
} FeatureType;
static const char* const kFourccList[LAST_FEATURE] = {
NULL, "EXIF", "XMP ", "ICCP", "ANMF", "FRGM"
};
static const char* const kDescriptions[LAST_FEATURE] = {
NULL, "EXIF metadata", "XMP metadata", "ICC profile",
"Animation frame", "Tile fragment"
};
typedef struct {
FeatureType type_;
FeatureArg* args_;
@ -185,7 +199,8 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
if (flag & ANIMATION_FLAG) printf(" animation");
if (flag & TILE_FLAG) printf(" tiling");
if (flag & ICCP_FLAG) printf(" icc profile");
if (flag & META_FLAG) printf(" metadata");
if (flag & EXIF_FLAG) printf(" EXIF metadata");
if (flag & XMP_FLAG) printf(" XMP metadata");
if (flag & ALPHA_FLAG) printf(" transparency");
printf("\n");
@ -226,15 +241,22 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
if (flag & ICCP_FLAG) {
WebPData icc_profile;
err = WebPMuxGetChunk(mux, "ICCP", &icc_profile);
RETURN_IF_ERROR("Failed to retrieve the color profile\n");
printf("Size of the color profile data: %zu\n", icc_profile.size);
RETURN_IF_ERROR("Failed to retrieve the ICC profile\n");
printf("Size of the ICC profile data: %zu\n", icc_profile.size);
}
if (flag & META_FLAG) {
WebPData metadata;
err = WebPMuxGetChunk(mux, "META", &metadata);
RETURN_IF_ERROR("Failed to retrieve the metadata\n");
printf("Size of the metadata: %zu\n", metadata.size);
if (flag & EXIF_FLAG) {
WebPData exif;
err = WebPMuxGetChunk(mux, "EXIF", &exif);
RETURN_IF_ERROR("Failed to retrieve the EXIF metadata\n");
printf("Size of the EXIF metadata: %zu\n", exif.size);
}
if (flag & XMP_FLAG) {
WebPData xmp;
err = WebPMuxGetChunk(mux, "XMP ", &xmp);
RETURN_IF_ERROR("Failed to retrieve the XMP metadata\n");
printf("Size of the XMP metadata: %zu\n", xmp.size);
}
if ((flag & ALPHA_FLAG) && !(flag & (ANIMATION_FLAG | TILE_FLAG))) {
@ -260,41 +282,48 @@ static void PrintHelp(void) {
printf("\n");
printf("GET_OPTIONS:\n");
printf(" Extract relevant data.\n");
printf(" icc Get ICCP Color profile.\n");
printf(" meta Get XMP/EXIF metadata.\n");
printf(" icc Get ICC profile.\n");
printf(" exif Get EXIF metadata.\n");
printf(" xmp Get XMP metadata.\n");
printf(" tile n Get nth tile.\n");
printf(" frame n Get nth frame.\n");
printf("\n");
printf("SET_OPTIONS:\n");
printf(" Set color profile/metadata.\n");
printf(" icc file.icc Set ICC Color profile.\n");
printf(" meta file.meta Set XMP/EXIF metadata.\n");
printf(" where: 'file.icc' contains the color profile to be set,\n");
printf(" 'file.meta' contains the metadata to be set\n");
printf(" icc file.icc Set ICC profile.\n");
printf(" exif file.exif Set EXIF metadata.\n");
printf(" xmp file.xmp Set XMP metadata.\n");
printf(" where: 'file.icc' contains the ICC profile to be set,\n");
printf(" 'file.exif' contains the EXIF metadata to be set\n");
printf(" 'file.xmp' contains the XMP metadata to be set\n");
printf("\n");
printf("STRIP_OPTIONS:\n");
printf(" Strip color profile/metadata.\n");
printf(" icc Strip ICCP color profile.\n");
printf(" meta Strip XMP/EXIF metadata.\n");
printf(" icc Strip ICC profile.\n");
printf(" exif Strip EXIF metadata.\n");
printf(" xmp Strip XMP metadata.\n");
printf("\n");
printf("TILE_OPTIONS(i):\n");
printf(" Create tiled image.\n");
printf(" file_i +xi+yi\n");
printf(" where: 'file_i' is the i'th tile (webp format),\n");
printf(" where: 'file_i' is the i'th tile (WebP format),\n");
printf(" 'xi','yi' specify the image offset for this tile.\n");
printf("\n");
printf("FRAME_OPTIONS(i):\n");
printf(" Create animation.\n");
printf(" file_i +xi+yi+di\n");
printf(" where: 'file_i' is the i'th animation frame (webp format),\n");
printf(" where: 'file_i' is the i'th animation frame (WebP format),\n");
printf(" 'xi','yi' specify the image offset for this frame.\n");
printf(" 'di' is the pause duration before next frame.\n");
printf("\nINPUT & OUTPUT are in webp format.\n");
printf("\nINPUT & OUTPUT are in WebP format.\n");
printf("\nNote: The nature of EXIF, XMP and ICC data is not checked and is "
"assumed to be valid.\n");
}
static int ReadFileToWebPData(const char* const filename,
@ -421,7 +450,7 @@ static int ValidateCommandLine(int argc, const char* argv[],
assert(ok == 1);
if (num_frame_args == 0 && num_tile_args == 0) {
// Single argument ('set' action for META or ICCP, OR a 'get' action).
// Single argument ('set' action for ICCP/EXIF/XMP, OR a 'get' action).
*num_feature_args = 1;
} else {
// Multiple arguments ('set' action for animation or tiling).
@ -561,10 +590,11 @@ static int ParseCommandLine(int argc, const char* argv[],
ERROR_GOTO1("ERROR: Action must be specified before other arguments.\n",
ErrParse);
}
if (!strcmp(argv[i], "icc") || !strcmp(argv[i], "meta")) {
if (!strcmp(argv[i], "icc") || !strcmp(argv[i], "exif") ||
!strcmp(argv[i], "xmp")) {
if (FEATURETYPE_IS_NIL) {
feature->type_ = (!strcmp(argv[i], "icc")) ? FEATURE_ICCP :
FEATURE_META;
(!strcmp(argv[i], "exif")) ? FEATURE_EXIF : FEATURE_XMP;
} else {
ERROR_GOTO1("ERROR: Multiple features specified.\n", ErrParse);
}
@ -723,7 +753,7 @@ static int GetFrameTile(const WebPMux* mux,
// Read and process config.
static int Process(const WebPMuxConfig* config) {
WebPMux* mux = NULL;
WebPData metadata, color_profile;
WebPData chunk;
WebPMuxError err = WEBP_MUX_OK;
int index = 0;
int ok = 1;
@ -735,28 +765,20 @@ static int Process(const WebPMuxConfig* config) {
if (!ok) goto Err2;
switch (feature->type_) {
case FEATURE_FRM:
ok = GetFrameTile(mux, config, 1);
break;
case FEATURE_TILE:
ok = GetFrameTile(mux, config, 0);
ok = GetFrameTile(mux, config,
(feature->type_ == FEATURE_FRM) ? 1 : 0);
break;
case FEATURE_ICCP:
err = WebPMuxGetChunk(mux, "ICCP", &color_profile);
case FEATURE_EXIF:
case FEATURE_XMP:
err = WebPMuxGetChunk(mux, kFourccList[feature->type_], &chunk);
if (err != WEBP_MUX_OK) {
ERROR_GOTO2("ERROR (%s): Could not get color profile.\n",
ErrorString(err), Err2);
ERROR_GOTO3("ERROR (%s): Could not get the %s.\n",
ErrorString(err), kDescriptions[feature->type_], Err2);
}
ok = WriteData(config->output_, &color_profile);
break;
case FEATURE_META:
err = WebPMuxGetChunk(mux, "META", &metadata);
if (err != WEBP_MUX_OK) {
ERROR_GOTO2("ERROR (%s): Could not get the metadata.\n",
ErrorString(err), Err2);
}
ok = WriteData(config->output_, &metadata);
ok = WriteData(config->output_, &chunk);
break;
default:
@ -834,28 +856,17 @@ static int Process(const WebPMuxConfig* config) {
break;
case FEATURE_ICCP:
case FEATURE_EXIF:
case FEATURE_XMP:
ok = CreateMux(config->input_, &mux);
if (!ok) goto Err2;
ok = ReadFileToWebPData(feature->args_[0].filename_, &color_profile);
ok = ReadFileToWebPData(feature->args_[0].filename_, &chunk);
if (!ok) goto Err2;
err = WebPMuxSetChunk(mux, "ICCP", &color_profile, 1);
free((void*)color_profile.bytes);
err = WebPMuxSetChunk(mux, kFourccList[feature->type_], &chunk, 1);
free((void*)chunk.bytes);
if (err != WEBP_MUX_OK) {
ERROR_GOTO2("ERROR (%s): Could not set color profile.\n",
ErrorString(err), Err2);
}
break;
case FEATURE_META:
ok = CreateMux(config->input_, &mux);
if (!ok) goto Err2;
ok = ReadFileToWebPData(feature->args_[0].filename_, &metadata);
if (!ok) goto Err2;
err = WebPMuxSetChunk(mux, "META", &metadata, 1);
free((void*)metadata.bytes);
if (err != WEBP_MUX_OK) {
ERROR_GOTO2("ERROR (%s): Could not set the metadata.\n",
ErrorString(err), Err2);
ERROR_GOTO3("ERROR (%s): Could not set the %s.\n",
ErrorString(err), kDescriptions[feature->type_], Err2);
}
break;
@ -869,22 +880,14 @@ static int Process(const WebPMuxConfig* config) {
case ACTION_STRIP:
ok = CreateMux(config->input_, &mux);
if (!ok) goto Err2;
switch (feature->type_) {
case FEATURE_ICCP:
err = WebPMuxDeleteChunk(mux, "ICCP");
if (feature->type_ == FEATURE_ICCP || feature->type_ == FEATURE_EXIF ||
feature->type_ == FEATURE_XMP) {
err = WebPMuxDeleteChunk(mux, kFourccList[feature->type_]);
if (err != WEBP_MUX_OK) {
ERROR_GOTO2("ERROR (%s): Could not delete color profile.\n",
ErrorString(err), Err2);
ERROR_GOTO3("ERROR (%s): Could not strip the %s.\n",
ErrorString(err), kDescriptions[feature->type_], Err2);
}
break;
case FEATURE_META:
err = WebPMuxDeleteChunk(mux, "META");
if (err != WEBP_MUX_OK) {
ERROR_GOTO2("ERROR (%s): Could not delete the metadata.\n",
ErrorString(err), Err2);
}
break;
default:
} else {
ERROR_GOTO1("ERROR: Invalid feature for action 'strip'.\n", Err2);
break;
}

60
man/webpmux.1
View File

@ -48,10 +48,13 @@ and extract/strip relevant data from the container file.
.SS GET_OPTIONS (\-get):
.TP
.B icc
Get ICC Color profile.
Get ICC profile.
.TP
.B meta
Get XMP/EXIF metadata.
.B exif
Get EXIF metadata.
.TP
.B xmp
Get XMP metadata.
.TP
.B tile n
Get nth tile.
@ -62,33 +65,41 @@ Get nth frame.
.SS SET_OPTIONS (\-set)
.TP
.B icc file.icc
Set ICC Color profile.
Set ICC profile.
.P
Where: 'file.icc' contains the color profile to be set.
Where: 'file.icc' contains the ICC profile to be set.
.TP
.B meta file.meta
Set XMP/EXIF metadata.
.B exif file.exif
Set EXIF metadata.
.P
Where: 'file.meta' contains the metadata to be set.
Where: 'file.exif' contains the EXIF metadata to be set.
.TP
.B xmp file.xmp
Set XMP metadata.
.P
Where: 'file.xmp' contains the XMP metadata to be set.
.SS STRIP_OPTIONS (\-strip)
.TP
.B icc
Strip ICC Color profile.
Strip ICC profile.
.TP
.B meta
Strip XMP/EXIF metadata.
.B exif
Strip EXIF metadata.
.TP
.B xmp
Strip XMP metadata.
.SS TILE_OPTIONS (\-tile)
.TP
.B file_i +xi+yi
Where: 'file_i' is the i'th tile (webp format) and 'xi','yi' specify the image
Where: 'file_i' is the i'th tile (WebP format) and 'xi','yi' specify the image
offset for this tile.
.SS FRAME_OPTIONS (\-frame)
.TP
.B file_i +xi+yi+di
Where: 'file_i' is the i'th frame (webp format), 'xi','yi' specify the image
Where: 'file_i' is the i'th frame (WebP format), 'xi','yi' specify the image
offset for this frame and 'di' is the pause duration before next frame.
.TP
.B \-loop n
@ -102,6 +113,10 @@ Input file in WebP format.
.TP
Output file in WebP format.
.SS Note:
.TP
The nature of EXIF, XMP and ICC data is not checked and is assumed to be valid.
.SH BUGS
Please report all bugs to our issue tracker:
http://code.google.com/p/webp/issues
@ -114,14 +129,29 @@ webpmux \-set icc image_profile.icc in.webp \-o icc_container.webp
.br
webpmux \-get icc icc_container.webp \-o image_profile.icc
.br
webpmux \-set meta image_metadata.meta in.webp \-o meta_container.webp
webpmux \-strip icc icc_container.webp \-o without_icc.webp
.br
webpmux \-get meta meta_container.webp \-o image_metadata.meta
webpmux \-set xmp image_metadata.xmp in.webp \-o xmp_container.webp
.br
webpmux \-get xmp xmp_container.webp \-o image_metadata.xmp
.br
webpmux \-strip xmp xmp_container.webp \-o without_xmp.webp
.br
webpmux \-set exif image_metadata.exif in.webp \-o exif_container.webp
.br
webpmux \-get exif exif_container.webp \-o image_metadata.exif
.br
webpmux \-strip exif exif_container.webp \-o without_exif.webp
.br
webpmux \-frame anim_1.webp +0+0+0 \-frame anim_2.webp +50+50+0 \-loop 10
\-o anim_container.webp
.br
webpmux \-get frame 2 anim_container.webp \-o frame_2.webp
.br
webpmux \-tile tile_1.webp +0+0 \-tile tile_2.webp +960+0 \-tile tile_3.webp
+0+576 \-tile tile_4.webp +960+576 \-o tile_container.webp
.br
webpmux \-get tile 2 tile_container.webp \-o tile_2.webp
.SH AUTHORS
\fBwebpmux\fP is written by the WebP team.

2
src/dec/webp.c
View File

@ -41,7 +41,7 @@ extern "C" {
// 24..26 Width of the Canvas Image.
// 27..29 Height of the Canvas Image.
// There can be extra chunks after the "VP8X" chunk (ICCP, TILE, FRM, VP8,
// META ...)
// XMP, EXIF ...)
// All sizes are in little-endian order.
// Note: chunk data size must be padded to multiple of 2 when written.

8
src/mux/demux.c
View File

@ -514,8 +514,12 @@ static ParseStatus ParseVP8X(WebPDemuxer* const dmux) {
store_chunk = !!(dmux->feature_flags_ & ICCP_FLAG);
goto Skip;
}
case MKFOURCC('M', 'E', 'T', 'A'): {
store_chunk = !!(dmux->feature_flags_ & META_FLAG);
case MKFOURCC('X', 'M', 'P', ' '): {
store_chunk = !!(dmux->feature_flags_ & XMP_FLAG);
goto Skip;
}
case MKFOURCC('E', 'X', 'I', 'F'): {
store_chunk = !!(dmux->feature_flags_ & EXIF_FLAG);
goto Skip;
}
Skip:

23
src/mux/muxedit.c
View File

@ -48,7 +48,8 @@ static void MuxRelease(WebPMux* const mux) {
DeleteAllChunks(&mux->vp8x_);
DeleteAllChunks(&mux->iccp_);
DeleteAllChunks(&mux->loop_);
DeleteAllChunks(&mux->meta_);
DeleteAllChunks(&mux->exif_);
DeleteAllChunks(&mux->xmp_);
DeleteAllChunks(&mux->unknown_);
}
@ -82,7 +83,8 @@ static WebPMuxError MuxSet(WebPMux* const mux, CHUNK_INDEX idx, uint32_t nth,
SWITCH_ID_LIST(IDX_VP8X, &mux->vp8x_);
SWITCH_ID_LIST(IDX_ICCP, &mux->iccp_);
SWITCH_ID_LIST(IDX_LOOP, &mux->loop_);
SWITCH_ID_LIST(IDX_META, &mux->meta_);
SWITCH_ID_LIST(IDX_EXIF, &mux->exif_);
SWITCH_ID_LIST(IDX_XMP, &mux->xmp_);
if (idx == IDX_UNKNOWN && data->size > TAG_SIZE) {
// For raw-data unknown chunk, the first four bytes should be the tag to be
// used for the chunk.
@ -529,11 +531,12 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
if (mux->iccp_ != NULL && mux->iccp_->data_.bytes != NULL) {
flags |= ICCP_FLAG;
}
if (mux->meta_ != NULL && mux->meta_->data_.bytes != NULL) {
flags |= META_FLAG;
if (mux->exif_ != NULL && mux->exif_->data_.bytes != NULL) {
flags |= EXIF_FLAG;
}
if (mux->xmp_ != NULL && mux->xmp_->data_.bytes != NULL) {
flags |= XMP_FLAG;
}
if (images->header_ != NULL) {
if (images->header_->tag_ == kChunks[IDX_FRGM].tag) {
// This is a tiled image.
@ -543,7 +546,6 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
flags |= ANIMATION_FLAG;
}
}
if (MuxImageCount(images, WEBP_CHUNK_ALPHA) > 0) {
flags |= ALPHA_FLAG; // Some images have an alpha channel.
}
@ -610,8 +612,8 @@ WebPMuxError WebPMuxAssemble(WebPMux* mux, WebPData* assembled_data) {
// Allocate data.
size = ChunksListDiskSize(mux->vp8x_) + ChunksListDiskSize(mux->iccp_)
+ ChunksListDiskSize(mux->loop_) + MuxImageListDiskSize(mux->images_)
+ ChunksListDiskSize(mux->meta_) + ChunksListDiskSize(mux->unknown_)
+ RIFF_HEADER_SIZE;
+ ChunksListDiskSize(mux->exif_) + ChunksListDiskSize(mux->xmp_)
+ ChunksListDiskSize(mux->unknown_) + RIFF_HEADER_SIZE;
data = (uint8_t*)malloc(size);
if (data == NULL) return WEBP_MUX_MEMORY_ERROR;
@ -622,7 +624,8 @@ WebPMuxError WebPMuxAssemble(WebPMux* mux, WebPData* assembled_data) {
dst = ChunkListEmit(mux->iccp_, dst);
dst = ChunkListEmit(mux->loop_, dst);
dst = MuxImageListEmit(mux->images_, dst);
dst = ChunkListEmit(mux->meta_, dst);
dst = ChunkListEmit(mux->exif_, dst);
dst = ChunkListEmit(mux->xmp_, dst);
dst = ChunkListEmit(mux->unknown_, dst);
assert(dst == data + size);

6
src/mux/muxi.h
View File

@ -51,7 +51,8 @@ struct WebPMuxImage {
struct WebPMux {
WebPMuxImage* images_;
WebPChunk* iccp_;
WebPChunk* meta_;
WebPChunk* exif_;
WebPChunk* xmp_;
WebPChunk* loop_;
WebPChunk* vp8x_;
@ -71,7 +72,8 @@ typedef enum {
IDX_ALPHA,
IDX_VP8,
IDX_VP8L,
IDX_META,
IDX_EXIF,
IDX_XMP,
IDX_UNKNOWN,
IDX_NIL,

15
src/mux/muxinternal.c
View File

@ -28,7 +28,8 @@ const ChunkInfo kChunks[] = {
{ MKFOURCC('A', 'L', 'P', 'H'), WEBP_CHUNK_ALPHA, UNDEFINED_CHUNK_SIZE },
{ MKFOURCC('V', 'P', '8', ' '), WEBP_CHUNK_IMAGE, UNDEFINED_CHUNK_SIZE },
{ MKFOURCC('V', 'P', '8', 'L'), WEBP_CHUNK_IMAGE, UNDEFINED_CHUNK_SIZE },
{ MKFOURCC('M', 'E', 'T', 'A'), WEBP_CHUNK_META, UNDEFINED_CHUNK_SIZE },
{ MKFOURCC('E', 'X', 'I', 'F'), WEBP_CHUNK_EXIF, UNDEFINED_CHUNK_SIZE },
{ MKFOURCC('X', 'M', 'P', ' '), WEBP_CHUNK_XMP, UNDEFINED_CHUNK_SIZE },
{ MKFOURCC('U', 'N', 'K', 'N'), WEBP_CHUNK_UNKNOWN, UNDEFINED_CHUNK_SIZE },
{ NIL_TAG, WEBP_CHUNK_NIL, UNDEFINED_CHUNK_SIZE }
@ -446,7 +447,8 @@ WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, WebPChunkId id) {
case WEBP_CHUNK_VP8X: return (WebPChunk**)&mux->vp8x_;
case WEBP_CHUNK_ICCP: return (WebPChunk**)&mux->iccp_;
case WEBP_CHUNK_LOOP: return (WebPChunk**)&mux->loop_;
case WEBP_CHUNK_META: return (WebPChunk**)&mux->meta_;
case WEBP_CHUNK_EXIF: return (WebPChunk**)&mux->exif_;
case WEBP_CHUNK_XMP: return (WebPChunk**)&mux->xmp_;
case WEBP_CHUNK_UNKNOWN: return (WebPChunk**)&mux->unknown_;
default: return NULL;
}
@ -495,7 +497,8 @@ static WebPMuxError ValidateChunk(const WebPMux* const mux, CHUNK_INDEX idx,
WebPMuxError MuxValidate(const WebPMux* const mux) {
int num_iccp;
int num_meta;
int num_exif;
int num_xmp;
int num_loop_chunks;
int num_frames;
int num_tiles;
@ -518,8 +521,12 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
err = ValidateChunk(mux, IDX_ICCP, ICCP_FLAG, flags, 1, &num_iccp);
if (err != WEBP_MUX_OK) return err;
// At most one EXIF metadata.
err = ValidateChunk(mux, IDX_EXIF, EXIF_FLAG, flags, 1, &num_exif);
if (err != WEBP_MUX_OK) return err;
// At most one XMP metadata.
err = ValidateChunk(mux, IDX_META, META_FLAG, flags, 1, &num_meta);
err = ValidateChunk(mux, IDX_XMP, XMP_FLAG, flags, 1, &num_xmp);
if (err != WEBP_MUX_OK) return err;
// Animation: ANIMATION_FLAG, loop chunk and frame chunk(s) are consistent.

3
src/mux/muxread.c
View File

@ -42,7 +42,8 @@ static WebPMuxError MuxGet(const WebPMux* const mux, CHUNK_INDEX idx,
SWITCH_ID_LIST(IDX_VP8X, mux->vp8x_);
SWITCH_ID_LIST(IDX_ICCP, mux->iccp_);
SWITCH_ID_LIST(IDX_LOOP, mux->loop_);
SWITCH_ID_LIST(IDX_META, mux->meta_);
SWITCH_ID_LIST(IDX_EXIF, mux->exif_);
SWITCH_ID_LIST(IDX_XMP, mux->xmp_);
SWITCH_ID_LIST(IDX_UNKNOWN, mux->unknown_);
return WEBP_MUX_NOT_FOUND;
}

14
src/webp/format_constants.h
View File

@ -70,12 +70,14 @@ typedef enum {
#define FRGM_CHUNK_SIZE 6 // Size of a FRGM chunk.
#define VP8X_CHUNK_SIZE 10 // Size of a VP8X chunk.
#define TILING_FLAG_BIT 0x01 // Set if tiles are possibly used.
#define ANIMATION_FLAG_BIT 0x02 // Set if some animation is expected
#define ICC_FLAG_BIT 0x04 // Whether ICC is present or not.
#define METADATA_FLAG_BIT 0x08 // Set if some META chunk is possibly present.
#define ALPHA_FLAG_BIT 0x10 // Should be same as the ALPHA_FLAG in mux.h
#define ROTATION_FLAG_BITS 0xe0 // all 3 bits for rotation + symmetry
// 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
#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.

22
src/webp/mux.h
View File

@ -11,7 +11,7 @@
// Vikas (vikasa@google.com)
// This API allows manipulation of WebP container images containing features
// like Color profile, XMP metadata, Animation and Tiling.
// like color profile, metadata, animation and tiling.
//
// Code Example#1: Creating a MUX with image data, color profile and XMP
// metadata.
@ -23,7 +23,7 @@
// // ... (Prepare ICCP color profile data).
// WebPMuxSetChunk(mux, "ICCP", &icc_profile, copy_data);
// // ... (Prepare XMP metadata).
// WebPMuxSetChunk(mux, "META", &xmp, copy_data);
// WebPMuxSetChunk(mux, "XMP ", &xmp, copy_data);
// // Get data from mux in WebP RIFF format.
// WebPMuxAssemble(mux, &output_data);
// WebPMuxDelete(mux);
@ -84,9 +84,10 @@ enum WebPMuxError {
enum WebPFeatureFlags {
TILE_FLAG = 0x00000001,
ANIMATION_FLAG = 0x00000002,
ICCP_FLAG = 0x00000004,
META_FLAG = 0x00000008,
ALPHA_FLAG = 0x00000010
XMP_FLAG = 0x00000004,
EXIF_FLAG = 0x00000008,
ALPHA_FLAG = 0x00000010,
ICCP_FLAG = 0x00000020
};
// IDs for different types of chunks.
@ -98,7 +99,8 @@ enum WebPChunkId {
WEBP_CHUNK_FRGM, // FRGM
WEBP_CHUNK_ALPHA, // ALPH
WEBP_CHUNK_IMAGE, // VP8/VP8L
WEBP_CHUNK_META, // META
WEBP_CHUNK_EXIF, // EXIF
WEBP_CHUNK_XMP, // XMP
WEBP_CHUNK_UNKNOWN, // Other chunks.
WEBP_CHUNK_NIL
};
@ -174,7 +176,7 @@ static WEBP_INLINE WebPMux* WebPMuxCreate(const WebPData* bitstream,
// Parameters:
// mux - (in/out) object to which the chunk is to be added
// fourcc - (in) a character array containing the fourcc of the given chunk;
// e.g., "ICCP", "META" etc.
// e.g., "ICCP", "XMP ", "EXIF" etc.
// chunk_data - (in) the chunk data to be added
// copy_data - (in) value 1 indicates given data WILL be copied to the mux
// and value 0 indicates data will NOT be copied.
@ -192,7 +194,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxSetChunk(
// Parameters:
// mux - (in) object from which the chunk data is to be fetched
// fourcc - (in) a character array containing the fourcc of the chunk;
// e.g., "ICCP", "META" etc.
// e.g., "ICCP", "XMP ", "EXIF" etc.
// chunk_data - (out) returned chunk data
// Returns:
// WEBP_MUX_INVALID_ARGUMENT - if either mux, fourcc or chunk_data is NULL
@ -206,7 +208,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxGetChunk(
// Parameters:
// mux - (in/out) object from which the chunk is to be deleted
// fourcc - (in) a character array containing the fourcc of the chunk;
// e.g., "ICCP", "META" etc.
// e.g., "ICCP", "XMP ", "EXIF" etc.
// Returns:
// WEBP_MUX_INVALID_ARGUMENT - if mux or fourcc is NULL
// or if fourcc corresponds to an image chunk.
@ -481,7 +483,7 @@ struct WebPChunkIterator {
// 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", "META", "EXIF", etc.
// 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.