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remove mention of fragment, frgm, FRGM, etc.

Browse Source 
demux.h still has a 'fragment' field, for historical reasons.

bumped the ABI number in mux.h

Change-Id: I73299aa2e96b1f2e44f5cebfd84c597d1db12bff
This commit is contained in:
Pascal Massimino
2016-09-02 14:26:37 +02:00
parent 9e478f808e
commit 545c147fd8
11 changed files with 137 additions and 266 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
src/dec/webp.c
View File

@@ -39,8 +39,8 @@
// 20..23 VP8X flags bit-map corresponding to the chunk-types present.
// 24..26 Width of the Canvas Image.
// 27..29 Height of the Canvas Image.
// There can be extra chunks after the "VP8X" chunk (ICCP, FRGM, ANMF, VP8,
// VP8L, XMP, EXIF ...)
// There can be extra chunks after the "VP8X" chunk (ICCP, ANMF, VP8, VP8L,
// XMP, EXIF ...)
// All sizes are in little-endian order.
// Note: chunk data size must be padded to multiple of 2 when written.
@@ -289,7 +289,6 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
int found_riff = 0;
int found_vp8x = 0;
int animation_present = 0;
int fragments_present = 0;
const int have_all_data = (headers != NULL) ? headers->have_all_data : 0;
VP8StatusCode status;
@@ -318,7 +317,6 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
return status; // Wrong VP8X / insufficient data.
}
animation_present = !!(flags & ANIMATION_FLAG);
fragments_present = !!(flags & FRAGMENTS_FLAG);
if (!found_riff && found_vp8x) {
// Note: This restriction may be removed in the future, if it becomes
// necessary to send VP8X chunk to the decoder.
@@ -330,8 +328,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
image_width = canvas_width;
image_height = canvas_height;
if (found_vp8x && (animation_present || fragments_present) &&
headers == NULL) {
if (found_vp8x && animation_present && headers == NULL) {
status = VP8_STATUS_OK;
goto ReturnWidthHeight; // Just return features from VP8X header.
}
@@ -362,7 +359,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
return VP8_STATUS_BITSTREAM_ERROR;
}
if (format != NULL && !(animation_present || fragments_present)) {
if (format != NULL && !animation_present) {
*format = hdrs.is_lossless ? 2 : 1;
}

3
src/demux/demux.c
View File

@@ -590,7 +590,6 @@ static int CheckFrameBounds(const Frame* const frame, int exact,
static int IsValidExtendedFormat(const WebPDemuxer* const dmux) {
const int is_animation = !!(dmux->feature_flags_ & ANIMATION_FLAG);
const int is_fragmented = !!(dmux->feature_flags_ & FRAGMENTS_FLAG);
const Frame* f = dmux->frames_;
if (dmux->state_ == WEBP_DEMUX_PARSING_HEADER) return 1;
@@ -598,7 +597,7 @@ static int IsValidExtendedFormat(const WebPDemuxer* const dmux) {
if (dmux->canvas_width_ <= 0 || dmux->canvas_height_ <= 0) return 0;
if (dmux->loop_count_ < 0) return 0;
if (dmux->state_ == WEBP_DEMUX_DONE && dmux->frames_ == NULL) return 0;
if (is_fragmented) return 0;
if (dmux->feature_flags_ & ~ALL_VALID_FLAGS) return 0; // invalid bitstream
while (f != NULL) {
const int cur_frame_set = f->frame_num_;

157
src/mux/muxedit.c
View File

@@ -93,34 +93,32 @@ static WebPMuxError MuxSet(WebPMux* const mux, uint32_t tag, uint32_t nth,
}
#undef SWITCH_ID_LIST
// Create data for frame/fragment given image data, offsets and duration.
static WebPMuxError CreateFrameFragmentData(
int width, int height, const WebPMuxFrameInfo* const info, int is_frame,
WebPData* const frame_frgm) {
uint8_t* frame_frgm_bytes;
const size_t frame_frgm_size = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].size;
// Create data for frame given image data, offsets and duration.
static WebPMuxError CreateFrameData(
int width, int height, const WebPMuxFrameInfo* const info,
WebPData* const frame) {
uint8_t* frame_bytes;
const size_t frame_size = kChunks[IDX_ANMF].size;
assert(width > 0 && height > 0 && info->duration >= 0);
assert(info->dispose_method == (info->dispose_method & 1));
// Note: assertion on upper bounds is done in PutLE24().
frame_frgm_bytes = (uint8_t*)WebPSafeMalloc(1ULL, frame_frgm_size);
if (frame_frgm_bytes == NULL) return WEBP_MUX_MEMORY_ERROR;
frame_bytes = (uint8_t*)WebPSafeMalloc(1ULL, frame_size);
if (frame_bytes == NULL) return WEBP_MUX_MEMORY_ERROR;
PutLE24(frame_frgm_bytes + 0, info->x_offset / 2);
PutLE24(frame_frgm_bytes + 3, info->y_offset / 2);
PutLE24(frame_bytes + 0, info->x_offset / 2);
PutLE24(frame_bytes + 3, info->y_offset / 2);
if (is_frame) {
PutLE24(frame_frgm_bytes + 6, width - 1);
PutLE24(frame_frgm_bytes + 9, height - 1);
PutLE24(frame_frgm_bytes + 12, info->duration);
frame_frgm_bytes[15] =
(info->blend_method == WEBP_MUX_NO_BLEND ? 2 : 0) |
(info->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ? 1 : 0);
}
PutLE24(frame_bytes + 6, width - 1);
PutLE24(frame_bytes + 9, height - 1);
PutLE24(frame_bytes + 12, info->duration);
frame_bytes[15] =
(info->blend_method == WEBP_MUX_NO_BLEND ? 2 : 0) |
(info->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ? 1 : 0);
frame_frgm->bytes = frame_frgm_bytes;
frame_frgm->size = frame_frgm_size;
frame->bytes = frame_bytes;
frame->size = frame_size;
return WEBP_MUX_OK;
}
@@ -264,23 +262,16 @@ WebPMuxError WebPMuxSetImage(WebPMux* mux, const WebPData* bitstream,
return err;
}
WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* frame,
WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* info,
int copy_data) {
WebPMuxImage wpi;
WebPMuxError err;
int is_frame;
const WebPData* const bitstream = &frame->bitstream;
const WebPData* const bitstream = &info->bitstream;
// Sanity checks.
if (mux == NULL || frame == NULL) return WEBP_MUX_INVALID_ARGUMENT;
if (mux == NULL || info == NULL) return WEBP_MUX_INVALID_ARGUMENT;
is_frame = (frame->id == WEBP_CHUNK_ANMF);
if (!(is_frame || (frame->id == WEBP_CHUNK_FRGM))) {
return WEBP_MUX_INVALID_ARGUMENT;
}
if (frame->id == WEBP_CHUNK_FRGM) { // Dead experiment.
return WEBP_MUX_INVALID_ARGUMENT;
}
if (info->id != WEBP_CHUNK_ANMF) return WEBP_MUX_INVALID_ARGUMENT;
if (bitstream->bytes == NULL || bitstream->size > MAX_CHUNK_PAYLOAD) {
return WEBP_MUX_INVALID_ARGUMENT;
@@ -290,7 +281,7 @@ WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* frame,
const WebPMuxImage* const image = mux->images_;
const uint32_t image_id = (image->header_ != NULL) ?
ChunkGetIdFromTag(image->header_->tag_) : WEBP_CHUNK_IMAGE;
if (image_id != frame->id) {
if (image_id != info->id) {
return WEBP_MUX_INVALID_ARGUMENT; // Conflicting frame types.
}
}
@@ -301,16 +292,11 @@ WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* frame,
assert(wpi.img_ != NULL); // As SetAlphaAndImageChunks() was successful.
{
WebPData frame_frgm;
const uint32_t tag = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].tag;
WebPMuxFrameInfo tmp = *frame;
WebPData frame;
const uint32_t tag = kChunks[IDX_ANMF].tag;
WebPMuxFrameInfo tmp = *info;
tmp.x_offset &= ~1; // Snap offsets to even.
tmp.y_offset &= ~1;
if (!is_frame) { // Reset unused values.
tmp.duration = 1;
tmp.dispose_method = WEBP_MUX_DISPOSE_NONE;
tmp.blend_method = WEBP_MUX_BLEND;
}
if (tmp.x_offset < 0 || tmp.x_offset >= MAX_POSITION_OFFSET ||
tmp.y_offset < 0 || tmp.y_offset >= MAX_POSITION_OFFSET ||
(tmp.duration < 0 || tmp.duration >= MAX_DURATION) ||
@@ -318,12 +304,11 @@ WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* frame,
err = WEBP_MUX_INVALID_ARGUMENT;
goto Err;
}
err = CreateFrameFragmentData(wpi.width_, wpi.height_, &tmp, is_frame,
&frame_frgm);
err = CreateFrameData(wpi.width_, wpi.height_, &tmp, &frame);
if (err != WEBP_MUX_OK) goto Err;
// Add frame/fragment chunk (with copy_data = 1).
err = AddDataToChunkList(&frame_frgm, 1, tag, &wpi.header_);
WebPDataClear(&frame_frgm); // frame_frgm owned by wpi.header_ now.
// Add frame chunk (with copy_data = 1).
err = AddDataToChunkList(&frame, 1, tag, &wpi.header_);
WebPDataClear(&frame); // frame owned by wpi.header_ now.
if (err != WEBP_MUX_OK) goto Err;
}
@@ -402,21 +387,18 @@ WebPMuxError WebPMuxDeleteFrame(WebPMux* mux, uint32_t nth) {
//------------------------------------------------------------------------------
// Assembly of the WebP RIFF file.
static WebPMuxError GetFrameFragmentInfo(
const WebPChunk* const frame_frgm_chunk,
static WebPMuxError GetFrameInfo(
const WebPChunk* const frame_chunk,
int* const x_offset, int* const y_offset, int* const duration) {
const uint32_t tag = frame_frgm_chunk->tag_;
const int is_frame = (tag == kChunks[IDX_ANMF].tag);
const WebPData* const data = &frame_frgm_chunk->data_;
const size_t expected_data_size =
is_frame ? ANMF_CHUNK_SIZE : FRGM_CHUNK_SIZE;
assert(frame_frgm_chunk != NULL);
assert(tag == kChunks[IDX_ANMF].tag || tag == kChunks[IDX_FRGM].tag);
const WebPData* const data = &frame_chunk->data_;
const size_t expected_data_size = ANMF_CHUNK_SIZE;
assert(frame_chunk->tag_ == kChunks[IDX_ANMF].tag);
assert(frame_chunk != NULL);
if (data->size != expected_data_size) return WEBP_MUX_INVALID_ARGUMENT;
*x_offset = 2 * GetLE24(data->bytes + 0);
*y_offset = 2 * GetLE24(data->bytes + 3);
if (is_frame) *duration = GetLE24(data->bytes + 12);
*duration = GetLE24(data->bytes + 12);
return WEBP_MUX_OK;
}
@@ -424,13 +406,13 @@ static WebPMuxError GetImageInfo(const WebPMuxImage* const wpi,
int* const x_offset, int* const y_offset,
int* const duration,
int* const width, int* const height) {
const WebPChunk* const frame_frgm_chunk = wpi->header_;
const WebPChunk* const frame_chunk = wpi->header_;
WebPMuxError err;
assert(wpi != NULL);
assert(frame_frgm_chunk != NULL);
assert(frame_chunk != NULL);
// Get offsets and duration from ANMF/FRGM chunk.
err = GetFrameFragmentInfo(frame_frgm_chunk, x_offset, y_offset, duration);
// Get offsets and duration from ANMF chunk.
err = GetFrameInfo(frame_chunk, x_offset, y_offset, duration);
if (err != WEBP_MUX_OK) return err;
// Get width and height from VP8/VP8L chunk.
@@ -441,7 +423,6 @@ static WebPMuxError GetImageInfo(const WebPMuxImage* const wpi,
// Returns the tightest dimension for the canvas considering the image list.
static WebPMuxError GetAdjustedCanvasSize(const WebPMux* const mux,
uint32_t flags,
int* const width, int* const height) {
WebPMuxImage* wpi = NULL;
assert(mux != NULL);
@@ -452,12 +433,10 @@ static WebPMuxError GetAdjustedCanvasSize(const WebPMux* const mux,
assert(wpi->img_ != NULL);
if (wpi->next_ != NULL) {
int max_x = 0;
int max_y = 0;
int64_t image_area = 0;
int max_x = 0, max_y = 0;
// if we have a chain of wpi's, header_ is necessarily set
assert(wpi->header_ != NULL);
// Aggregate the bounding box for animation frames & fragmented images.
// Aggregate the bounding box for animation frames.
for (; wpi != NULL; wpi = wpi->next_) {
int x_offset = 0, y_offset = 0, duration = 0, w = 0, h = 0;
const WebPMuxError err = GetImageInfo(wpi, &x_offset, &y_offset,
@@ -470,19 +449,9 @@ static WebPMuxError GetAdjustedCanvasSize(const WebPMux* const mux,
if (max_x_pos > max_x) max_x = max_x_pos;
if (max_y_pos > max_y) max_y = max_y_pos;
image_area += w * h;
}
*width = max_x;
*height = max_y;
// Crude check to validate that there are no image overlaps/holes for
// fragmented images. Check that the aggregated image area for individual
// fragments exactly matches the image area of the constructed canvas.
// However, the area-match is necessary but not sufficient condition.
if ((flags & FRAGMENTS_FLAG) && (image_area != (max_x * max_y))) {
*width = 0;
*height = 0;
return WEBP_MUX_INVALID_ARGUMENT;
}
} else {
// For a single image, canvas dimensions are same as image dimensions.
*width = wpi->width_;
@@ -528,10 +497,7 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
flags |= XMP_FLAG;
}
if (images->header_ != NULL) {
if (images->header_->tag_ == kChunks[IDX_FRGM].tag) {
// This is a fragmented image.
flags |= FRAGMENTS_FLAG;
} else if (images->header_->tag_ == kChunks[IDX_ANMF].tag) {
if (images->header_->tag_ == kChunks[IDX_ANMF].tag) {
// This is an image with animation.
flags |= ANIMATION_FLAG;
}
@@ -540,7 +506,7 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
flags |= ALPHA_FLAG; // Some images have an alpha channel.
}
err = GetAdjustedCanvasSize(mux, flags, &width, &height);
err = GetAdjustedCanvasSize(mux, &width, &height);
if (err != WEBP_MUX_OK) return err;
if (width <= 0 || height <= 0) {
@@ -580,31 +546,26 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
// Cleans up 'mux' by removing any unnecessary chunks.
static WebPMuxError MuxCleanup(WebPMux* const mux) {
int num_frames;
int num_fragments;
int num_anim_chunks;
// If we have an image with a single fragment or frame, and its rectangle
// covers the whole canvas, convert it to a non-animated non-fragmented image
// (to avoid writing FRGM/ANMF chunk unnecessarily).
// If we have an image with a single frame, and its rectangle
// covers the whole canvas, convert it to a non-animated image
// (to avoid writing ANMF chunk unnecessarily).
WebPMuxError err = WebPMuxNumChunks(mux, kChunks[IDX_ANMF].id, &num_frames);
if (err != WEBP_MUX_OK) return err;
err = WebPMuxNumChunks(mux, kChunks[IDX_FRGM].id, &num_fragments);
if (err != WEBP_MUX_OK) return err;
if (num_frames == 1 || num_fragments == 1) {
WebPMuxImage* frame_frag;
err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, 1, &frame_frag);
assert(err == WEBP_MUX_OK); // We know that one frame/fragment does exist.
assert(frame_frag != NULL);
if (frame_frag->header_ != NULL &&
if (num_frames == 1) {
WebPMuxImage* frame = NULL;
err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, 1, &frame);
assert(err == WEBP_MUX_OK); // We know that one frame does exist.
assert(frame != NULL);
if (frame->header_ != NULL &&
((mux->canvas_width_ == 0 && mux->canvas_height_ == 0) ||
(frame_frag->width_ == mux->canvas_width_ &&
frame_frag->height_ == mux->canvas_height_))) {
assert(frame_frag->header_->tag_ == kChunks[IDX_ANMF].tag ||
frame_frag->header_->tag_ == kChunks[IDX_FRGM].tag);
ChunkDelete(frame_frag->header_); // Removes ANMF/FRGM chunk.
frame_frag->header_ = NULL;
(frame->width_ == mux->canvas_width_ &&
frame->height_ == mux->canvas_height_))) {
assert(frame->header_->tag_ == kChunks[IDX_ANMF].tag);
ChunkDelete(frame->header_); // Removes ANMF chunk.
frame->header_ = NULL;
num_frames = 0;
num_fragments = 0;
}
}
// Remove ANIM chunk if this is a non-animated image.

8
src/mux/muxi.h
View File

@@ -36,16 +36,16 @@ struct WebPChunk {
uint32_t tag_;
int owner_; // True if *data_ memory is owned internally.
// VP8X, ANIM, and other internally created chunks
// like ANMF/FRGM are always owned.
// like ANMF are always owned.
WebPData data_;
WebPChunk* next_;
};
// MuxImage object. Store a full WebP image (including ANMF/FRGM chunk, ALPH
// 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/WEBP_CHUNK_FRGM.
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.
@@ -79,7 +79,6 @@ typedef enum {
IDX_ICCP,
IDX_ANIM,
IDX_ANMF,
IDX_FRGM,
IDX_ALPHA,
IDX_VP8,
IDX_VP8L,
@@ -185,7 +184,6 @@ int MuxImageFinalize(WebPMuxImage* const wpi);
static WEBP_INLINE int IsWPI(WebPChunkId id) {
switch (id) {
case WEBP_CHUNK_ANMF:
case WEBP_CHUNK_FRGM:
case WEBP_CHUNK_ALPHA:
case WEBP_CHUNK_IMAGE: return 1;
default: return 0;

21
src/mux/muxinternal.c
View File

@@ -23,7 +23,6 @@ const ChunkInfo kChunks[] = {
{ MKFOURCC('I', 'C', 'C', 'P'), WEBP_CHUNK_ICCP, UNDEFINED_CHUNK_SIZE },
{ MKFOURCC('A', 'N', 'I', 'M'), WEBP_CHUNK_ANIM, ANIM_CHUNK_SIZE },
{ MKFOURCC('A', 'N', 'M', 'F'), WEBP_CHUNK_ANMF, ANMF_CHUNK_SIZE },
{ MKFOURCC('F', 'R', 'G', 'M'), WEBP_CHUNK_FRGM, FRGM_CHUNK_SIZE },
{ 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 },
@@ -251,8 +250,7 @@ static WebPChunk** GetChunkListFromId(const WebPMuxImage* const wpi,
WebPChunkId id) {
assert(wpi != NULL);
switch (id) {
case WEBP_CHUNK_ANMF:
case WEBP_CHUNK_FRGM: return (WebPChunk**)&wpi->header_;
case WEBP_CHUNK_ANMF: return (WebPChunk**)&wpi->header_;
case WEBP_CHUNK_ALPHA: return (WebPChunk**)&wpi->alpha_;
case WEBP_CHUNK_IMAGE: return (WebPChunk**)&wpi->img_;
default: return NULL;
@@ -372,13 +370,12 @@ size_t MuxImageDiskSize(const WebPMuxImage* const wpi) {
return size;
}
// Special case as ANMF/FRGM chunk encapsulates other image chunks.
// Special case as ANMF chunk encapsulates other image chunks.
static uint8_t* ChunkEmitSpecial(const WebPChunk* const header,
size_t total_size, uint8_t* dst) {
const size_t header_size = header->data_.size;
const size_t offset_to_next = total_size - CHUNK_HEADER_SIZE;
assert(header->tag_ == kChunks[IDX_ANMF].tag ||
header->tag_ == kChunks[IDX_FRGM].tag);
assert(header->tag_ == kChunks[IDX_ANMF].tag);
PutLE32(dst + 0, header->tag_);
PutLE32(dst + TAG_SIZE, (uint32_t)offset_to_next);
assert(header_size == (uint32_t)header_size);
@@ -391,7 +388,7 @@ static uint8_t* ChunkEmitSpecial(const WebPChunk* const header,
uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst) {
// Ordering of chunks to be emitted is strictly as follows:
// 1. ANMF/FRGM chunk (if present).
// 1. ANMF chunk (if present).
// 2. ALPH chunk (if present).
// 3. VP8/VP8L chunk.
assert(wpi);
@@ -465,7 +462,6 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
int num_xmp;
int num_anim;
int num_frames;
int num_fragments;
int num_vp8x;
int num_images;
int num_alpha;
@@ -510,10 +506,6 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
}
}
// Fragmentation: FRAGMENTS_FLAG and FRGM chunk(s) are consistent.
err = ValidateChunk(mux, IDX_FRGM, FRAGMENTS_FLAG, flags, -1, &num_fragments);
if (err != WEBP_MUX_OK) return err;
// Verify either VP8X chunk is present OR there is only one elem in
// mux->images_.
err = ValidateChunk(mux, IDX_VP8X, NO_FLAG, flags, 1, &num_vp8x);
@@ -537,11 +529,6 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
if (flags & ALPHA_FLAG) return WEBP_MUX_INVALID_ARGUMENT;
}
// num_fragments & num_images are consistent.
if (num_fragments > 0 && num_images != num_fragments) {
return WEBP_MUX_INVALID_ARGUMENT;
}
return WEBP_MUX_OK;
}

48
src/mux/muxread.c
View File

@@ -104,17 +104,15 @@ static int MuxImageParse(const WebPChunk* const chunk, int copy_data,
size_t subchunk_size;
ChunkInit(&subchunk);
assert(chunk->tag_ == kChunks[IDX_ANMF].tag ||
chunk->tag_ == kChunks[IDX_FRGM].tag);
assert(chunk->tag_ == kChunks[IDX_ANMF].tag);
assert(!wpi->is_partial_);
// ANMF/FRGM.
// ANMF.
{
const size_t hdr_size = (chunk->tag_ == kChunks[IDX_ANMF].tag) ?
ANMF_CHUNK_SIZE : FRGM_CHUNK_SIZE;
const size_t hdr_size = ANMF_CHUNK_SIZE;
const WebPData temp = { bytes, hdr_size };
// Each of ANMF and FRGM chunk contain a header at the beginning. So, its
// size should at least be 'hdr_size'.
// Each of ANMF chunk contain a header at the beginning. So, its size should
// be at least 'hdr_size'.
if (size < hdr_size) goto Fail;
ChunkAssignData(&subchunk, &temp, copy_data, chunk->tag_);
}
@@ -292,16 +290,15 @@ WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data,
static WebPMuxError ValidateForSingleImage(const WebPMux* const mux) {
const int num_images = MuxImageCount(mux->images_, WEBP_CHUNK_IMAGE);
const int num_frames = MuxImageCount(mux->images_, WEBP_CHUNK_ANMF);
const int num_fragments = MuxImageCount(mux->images_, WEBP_CHUNK_FRGM);
if (num_images == 0) {
// No images in mux.
return WEBP_MUX_NOT_FOUND;
} else if (num_images == 1 && num_frames == 0 && num_fragments == 0) {
} else if (num_images == 1 && num_frames == 0) {
// Valid case (single image).
return WEBP_MUX_OK;
} else {
// Frame/Fragment case OR an invalid mux.
// Frame case OR an invalid mux.
return WEBP_MUX_INVALID_ARGUMENT;
}
}
@@ -379,7 +376,7 @@ static WebPMuxError SynthesizeBitstream(const WebPMuxImage* const wpi,
const int need_vp8x = (wpi->alpha_ != NULL);
const size_t vp8x_size = need_vp8x ? CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE : 0;
const size_t alpha_size = need_vp8x ? ChunkDiskSize(wpi->alpha_) : 0;
// Note: No need to output ANMF/FRGM chunk for a single image.
// Note: No need to output ANMF chunk for a single image.
const size_t size = RIFF_HEADER_SIZE + vp8x_size + alpha_size +
ChunkDiskSize(wpi->img_);
uint8_t* const data = (uint8_t*)WebPSafeMalloc(1ULL, size);
@@ -436,29 +433,24 @@ static WebPMuxError MuxGetImageInternal(const WebPMuxImage* const wpi,
return SynthesizeBitstream(wpi, &info->bitstream);
}
static WebPMuxError MuxGetFrameFragmentInternal(const WebPMuxImage* const wpi,
WebPMuxFrameInfo* const frame) {
static WebPMuxError MuxGetFrameInternal(const WebPMuxImage* const wpi,
WebPMuxFrameInfo* const frame) {
const int is_frame = (wpi->header_->tag_ == kChunks[IDX_ANMF].tag);
const CHUNK_INDEX idx = is_frame ? IDX_ANMF : IDX_FRGM;
const WebPData* frame_frgm_data;
const WebPData* frame_data;
if (!is_frame) return WEBP_MUX_INVALID_ARGUMENT;
assert(wpi->header_ != NULL); // Already checked by WebPMuxGetFrame().
// Get frame/fragment chunk.
frame_frgm_data = &wpi->header_->data_;
if (frame_frgm_data->size < kChunks[idx].size) return WEBP_MUX_BAD_DATA;
// Get frame chunk.
frame_data = &wpi->header_->data_;
if (frame_data->size < kChunks[IDX_ANMF].size) return WEBP_MUX_BAD_DATA;
// Extract info.
frame->x_offset = 2 * GetLE24(frame_frgm_data->bytes + 0);
frame->y_offset = 2 * GetLE24(frame_frgm_data->bytes + 3);
if (is_frame) {
const uint8_t bits = frame_frgm_data->bytes[15];
frame->duration = GetLE24(frame_frgm_data->bytes + 12);
frame->x_offset = 2 * GetLE24(frame_data->bytes + 0);
frame->y_offset = 2 * GetLE24(frame_data->bytes + 3);
{
const uint8_t bits = frame_data->bytes[15];
frame->duration = GetLE24(frame_data->bytes + 12);
frame->dispose_method =
(bits & 1) ? WEBP_MUX_DISPOSE_BACKGROUND : WEBP_MUX_DISPOSE_NONE;
frame->blend_method = (bits & 2) ? WEBP_MUX_NO_BLEND : WEBP_MUX_BLEND;
} else { // Defaults for unused values.
frame->duration = 1;
frame->dispose_method = WEBP_MUX_DISPOSE_NONE;
frame->blend_method = WEBP_MUX_BLEND;
}
frame->id = ChunkGetIdFromTag(wpi->header_->tag_);
return SynthesizeBitstream(wpi, &frame->bitstream);
@@ -482,7 +474,7 @@ WebPMuxError WebPMuxGetFrame(
if (wpi->header_ == NULL) {
return MuxGetImageInternal(wpi, frame);
} else {
return MuxGetFrameFragmentInternal(wpi, frame);
return MuxGetFrameInternal(wpi, frame);
}
}

3
src/webp/format_constants.h
View File

@@ -72,14 +72,13 @@ typedef enum {
#define RIFF_HEADER_SIZE 12 // Size of the RIFF header ("RIFFnnnnWEBP").
#define ANMF_CHUNK_SIZE 16 // Size of an ANMF chunk.
#define ANIM_CHUNK_SIZE 6 // Size of an ANIM chunk.
#define FRGM_CHUNK_SIZE 6 // Size of a FRGM chunk.
#define VP8X_CHUNK_SIZE 10 // Size of a VP8X chunk.
#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.
#define MAX_LOOP_COUNT (1 << 16) // maximum value for loop-count
#define MAX_DURATION (1 << 24) // maximum duration
#define MAX_POSITION_OFFSET (1 << 24) // maximum frame/fragment x/y offset
#define MAX_POSITION_OFFSET (1 << 24) // maximum frame x/y offset
// Maximum chunk payload is such that adding the header and padding won't
// overflow a uint32_t.

43
src/webp/mux.h
View File

@@ -21,13 +21,13 @@
extern "C" {
#endif
#define WEBP_MUX_ABI_VERSION 0x0106 // MAJOR(8b) + MINOR(8b)
#define WEBP_MUX_ABI_VERSION 0x0107 // MAJOR(8b) + MINOR(8b)
//------------------------------------------------------------------------------
// Mux API
//
// This API allows manipulation of WebP container images containing features
// like color profile, metadata, animation and fragmented images.
// like color profile, metadata, animation.
//
// Code Example#1: Create a WebPMux object with image data, color profile and
// XMP metadata.
@@ -81,16 +81,16 @@ typedef enum WebPMuxError {
// IDs for different types of chunks.
typedef enum WebPChunkId {
WEBP_CHUNK_VP8X, // VP8X
WEBP_CHUNK_ICCP, // ICCP
WEBP_CHUNK_ANIM, // ANIM
WEBP_CHUNK_ANMF, // ANMF
WEBP_CHUNK_FRGM, // FRGM
WEBP_CHUNK_ALPHA, // ALPH
WEBP_CHUNK_IMAGE, // VP8/VP8L
WEBP_CHUNK_EXIF, // EXIF
WEBP_CHUNK_XMP, // XMP
WEBP_CHUNK_UNKNOWN, // Other chunks.
WEBP_CHUNK_VP8X, // VP8X
WEBP_CHUNK_ICCP, // ICCP
WEBP_CHUNK_ANIM, // ANIM
WEBP_CHUNK_ANMF, // ANMF
WEBP_CHUNK_DEPRECATED, // (deprecated from FRGM)
WEBP_CHUNK_ALPHA, // ALPH
WEBP_CHUNK_IMAGE, // VP8/VP8L
WEBP_CHUNK_EXIF, // EXIF
WEBP_CHUNK_XMP, // XMP
WEBP_CHUNK_UNKNOWN, // Other chunks.
WEBP_CHUNK_NIL
} WebPChunkId;
@@ -142,7 +142,7 @@ static WEBP_INLINE WebPMux* WebPMuxCreate(const WebPData* bitstream,
// Non-image chunks.
// Note: Only non-image related chunks should be managed through chunk APIs.
// (Image related chunks are: "ANMF", "FRGM", "VP8 ", "VP8L" and "ALPH").
// (Image related chunks are: "ANMF", "VP8 ", "VP8L" and "ALPH").
// To add, get and delete images, use WebPMuxSetImage(), WebPMuxPushFrame(),
// WebPMuxGetFrame() and WebPMuxDeleteFrame().
@@ -195,7 +195,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxDeleteChunk(
//------------------------------------------------------------------------------
// Images.
// Encapsulates data about a single frame/fragment.
// Encapsulates data about a single frame.
struct WebPMuxFrameInfo {
WebPData bitstream; // image data: can be a raw VP8/VP8L bitstream
// or a single-image WebP file.
@@ -203,19 +203,19 @@ struct WebPMuxFrameInfo {
int y_offset; // y-offset of the frame.
int duration; // duration of the frame (in milliseconds).
WebPChunkId id; // frame type: should be one of WEBP_CHUNK_ANMF,
// WEBP_CHUNK_FRGM or WEBP_CHUNK_IMAGE
WebPChunkId id; // frame type: should be one of WEBP_CHUNK_ANMF
// or WEBP_CHUNK_IMAGE
WebPMuxAnimDispose dispose_method; // Disposal method for the frame.
WebPMuxAnimBlend blend_method; // Blend operation for the frame.
uint32_t pad[1]; // padding for later use
};
// Sets the (non-animated and non-fragmented) image in the mux object.
// Note: Any existing images (including frames/fragments) will be removed.
// Sets the (non-animated) image in the mux object.
// Note: Any existing images (including frames) will be removed.
// Parameters:
// mux - (in/out) object in which the image is to be set
// bitstream - (in) can be a raw VP8/VP8L bitstream or a single-image
// WebP file (non-animated and non-fragmented)
// WebP file (non-animated)
// copy_data - (in) value 1 indicates given data WILL be copied to the mux
// object and value 0 indicates data will NOT be copied.
// Returns:
@@ -226,9 +226,8 @@ WEBP_EXTERN(WebPMuxError) WebPMuxSetImage(
WebPMux* mux, const WebPData* bitstream, int copy_data);
// Adds a frame at the end of the mux object.
// Notes: (1) frame.id should be one of WEBP_CHUNK_ANMF or WEBP_CHUNK_FRGM
// (2) For setting a non-animated non-fragmented image, use
// WebPMuxSetImage() instead.
// Notes: (1) frame.id should be WEBP_CHUNK_ANMF
// (2) For setting a non-animated image, use WebPMuxSetImage() instead.
// (3) Type of frame being pushed must be same as the frames in mux.
// (4) As WebP only supports even offsets, any odd offset will be snapped
// to an even location using: offset &= ~1

5
src/webp/mux_types.h
View File

@@ -31,12 +31,13 @@ typedef struct WebPData WebPData;
// VP8X Feature Flags.
typedef enum WebPFeatureFlags {
FRAGMENTS_FLAG = 0x00000001,
ANIMATION_FLAG = 0x00000002,
XMP_FLAG = 0x00000004,
EXIF_FLAG = 0x00000008,
ALPHA_FLAG = 0x00000010,
ICCP_FLAG = 0x00000020
ICCP_FLAG = 0x00000020,
ALL_VALID_FLAGS = 0x0000003e
} WebPFeatureFlags;
// Dispose method (animation only). Indicates how the area used by the current