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Mux: only allow adding frame/tiles at the end.

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Change-Id: I5d685628da8c8ac85144cee2e5808b30ec79fef9
This commit is contained in:
Urvang Joshi 2012-06-22 11:17:02 -07:00
parent 2c341b0eed
commit b494ad5096
6 changed files with 32 additions and 59 deletions
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4
examples/webpmux.c
View File

@ -797,7 +797,7 @@ static int Process(const WebPMuxConfig* config) {
WebPDataClear(&webpdata);
ERROR_GOTO1("ERROR: Could not parse frame properties.\n", Err2);
}
err = WebPMuxSetFrame(mux, 0, &webpdata, x_offset, y_offset,
err = WebPMuxPushFrame(mux, &webpdata, x_offset, y_offset,
duration, 1);
WebPDataClear(&webpdata);
if (err != WEBP_MUX_OK) {
@ -825,7 +825,7 @@ static int Process(const WebPMuxConfig* config) {
WebPDataClear(&webpdata);
ERROR_GOTO1("ERROR: Could not parse tile properties.\n", Err2);
}
err = WebPMuxSetTile(mux, 0, &webpdata, x_offset, y_offset, 1);
err = WebPMuxPushTile(mux, &webpdata, x_offset, y_offset, 1);
WebPDataClear(&webpdata);
if (err != WEBP_MUX_OK) {
ERROR_GOTO3("ERROR#%d: Could not add a tile at index %d.\n",

21
src/mux/muxedit.c
View File

@ -273,7 +273,7 @@ WebPMuxError WebPMuxSetImage(WebPMux* const mux,
if (err != WEBP_MUX_OK) goto Err;
// Add this image to mux.
err = MuxImageSetNth(&wpi, &mux->images_, 1);
err = MuxImagePush(&wpi, &mux->images_);
if (err != WEBP_MUX_OK) goto Err;
// All OK.
@ -343,10 +343,9 @@ WebPMuxError WebPMuxSetLoopCount(WebPMux* const mux, uint32_t loop_count) {
return err;
}
static WebPMuxError MuxSetFrameTileInternal(
WebPMux* const mux, uint32_t nth, const WebPData* const bitstream,
uint32_t x_offset, uint32_t y_offset, uint32_t duration,
int copy_data, uint32_t tag) {
static WebPMuxError MuxPushFrameTileInternal(
WebPMux* const mux, const WebPData* const bitstream, uint32_t x_offset,
uint32_t y_offset, uint32_t duration, int copy_data, uint32_t tag) {
WebPChunk chunk;
WebPData image;
WebPData alpha;
@ -418,7 +417,7 @@ static WebPMuxError MuxSetFrameTileInternal(
ChunkInit(&chunk); // chunk owned by wpi.header_ now.
// Add this WebPMuxImage to mux.
err = MuxImageSetNth(&wpi, &mux->images_, nth);
err = MuxImagePush(&wpi, &mux->images_);
if (err != WEBP_MUX_OK) goto Err;
// All is well.
@ -432,21 +431,19 @@ static WebPMuxError MuxSetFrameTileInternal(
return err;
}
// TODO(urvang): Think about whether we need 'nth' while adding a frame or tile.
WebPMuxError WebPMuxSetFrame(WebPMux* const mux, uint32_t nth,
WebPMuxError WebPMuxPushFrame(WebPMux* const mux,
const WebPData* const bitstream,
uint32_t x_offset, uint32_t y_offset,
uint32_t duration, int copy_data) {
return MuxSetFrameTileInternal(mux, nth, bitstream, x_offset, y_offset,
return MuxPushFrameTileInternal(mux, bitstream, x_offset, y_offset,
duration, copy_data, kChunks[IDX_FRAME].tag);
}
WebPMuxError WebPMuxSetTile(WebPMux* const mux, uint32_t nth,
WebPMuxError WebPMuxPushTile(WebPMux* const mux,
const WebPData* const bitstream,
uint32_t x_offset, uint32_t y_offset,
int copy_data) {
return MuxSetFrameTileInternal(mux, nth, bitstream, x_offset, y_offset,
return MuxPushFrameTileInternal(mux, bitstream, x_offset, y_offset,
1 /* unused duration*/, copy_data,
kChunks[IDX_TILE].tag);
}

6
src/mux/muxi.h
View File

@ -215,10 +215,8 @@ static WEBP_INLINE WebPChunk** MuxImageGetListFromId(WebPMuxImage* wpi,
}
}
// Sets 'wpi' at nth position in the 'wpi_list'.
// nth = 0 has the special meaning "last of the list".
WebPMuxError MuxImageSetNth(const WebPMuxImage* wpi, WebPMuxImage** wpi_list,
uint32_t nth);
// Pushes 'wpi' at the end of 'wpi_list'.
WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list);
// Delete nth image in the image list with given tag id.
WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth,

37
src/mux/muxinternal.c
View File

@ -275,27 +275,6 @@ int MuxImageCount(WebPMuxImage* const wpi_list, WebPChunkId id) {
return count;
}
// Outputs a pointer to 'prev_wpi->next_',
// where 'prev_wpi' is the pointer to the image at position (nth - 1).
// Returns 1 if nth image was found, 0 otherwise.
static int SearchImageToSet(WebPMuxImage** wpi_list, uint32_t nth,
WebPMuxImage*** const location) {
uint32_t count = 0;
assert(wpi_list);
*location = wpi_list;
while (*wpi_list) {
WebPMuxImage* const cur_wpi = *wpi_list;
++count;
if (count == nth) return 1; // Found.
wpi_list = &cur_wpi->next_;
*location = wpi_list;
}
// *chunk_list is ok to be NULL if adding at last location.
return (nth == 0 || (count == nth - 1)) ? 1 : 0;
}
// Outputs a pointer to 'prev_wpi->next_',
// where 'prev_wpi' is the pointer to the image at position (nth - 1).
// Returns 1 if nth image with given id was found, 0 otherwise.
@ -335,19 +314,25 @@ static int SearchImageToGetOrDelete(WebPMuxImage** wpi_list, uint32_t nth,
//------------------------------------------------------------------------------
// MuxImage writer methods.
WebPMuxError MuxImageSetNth(const WebPMuxImage* wpi, WebPMuxImage** wpi_list,
uint32_t nth) {
WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list) {
WebPMuxImage* new_wpi;
if (!SearchImageToSet(wpi_list, nth, &wpi_list)) {
return WEBP_MUX_NOT_FOUND;
while (*wpi_list != NULL) {
WebPMuxImage* const cur_wpi = *wpi_list;
if (cur_wpi->next_ == NULL) break;
wpi_list = &cur_wpi->next_;
}
new_wpi = (WebPMuxImage*)malloc(sizeof(*new_wpi));
if (new_wpi == NULL) return WEBP_MUX_MEMORY_ERROR;
*new_wpi = *wpi;
new_wpi->next_ = *wpi_list;
new_wpi->next_ = NULL;
if (*wpi_list != NULL) {
(*wpi_list)->next_ = new_wpi;
} else {
*wpi_list = new_wpi;
}
return WEBP_MUX_OK;
}

2
src/mux/muxread.c
View File

@ -151,7 +151,7 @@ WebPMux* WebPMuxCreateInternal(const WebPData* const bitstream, int copy_data,
if (id == WEBP_CHUNK_IMAGE) {
wpi->is_partial_ = 0; // wpi is completely filled.
// Add this to mux->images_ list.
if (MuxImageSetNth(wpi, &mux->images_, 0) != WEBP_MUX_OK) goto Err;
if (MuxImagePush(wpi, &mux->images_) != WEBP_MUX_OK) goto Err;
MuxImageInit(wpi); // Reset for reading next image.
} else {
wpi->is_partial_ = 1; // wpi is only partially filled.

21
src/webp/mux.h
View File

@ -267,11 +267,9 @@ WEBP_EXTERN(WebPMuxError) WebPMuxDeleteColorProfile(WebPMux* const mux);
//------------------------------------------------------------------------------
// Animation.
// Adds an animation frame to the mux object.
// nth=0 has a special meaning - last position.
// Adds an animation frame at the end of the mux object.
// Parameters:
// mux - (in/out) object to which an animation frame is to be added
// nth - (in) The position at which the frame is to be added.
// bitstream - (in) the image data corresponding to the frame. It can either
// be a raw VP8/VP8L bitstream or a single-image WebP file
// (non-animated and non-tiled)
@ -282,17 +280,15 @@ WEBP_EXTERN(WebPMuxError) WebPMuxDeleteColorProfile(WebPMux* const mux);
// value 0 indicates data will NOT be copied.
// Returns:
// WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or bitstream is NULL
// WEBP_MUX_NOT_FOUND - If we have less than (nth-1) frames before adding.
// WEBP_MUX_MEMORY_ERROR - on memory allocation error.
// WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxSetFrame(
WebPMux* const mux, uint32_t nth, const WebPData* const bitstream,
WEBP_EXTERN(WebPMuxError) WebPMuxPushFrame(
WebPMux* const mux, const WebPData* const bitstream,
uint32_t x_offset, uint32_t y_offset, uint32_t duration,
int copy_data);
// TODO(urvang): Create a struct as follows to reduce argument list size:
// typedef struct {
// int nth;
// WebPData image;
// WebPData alpha;
// uint32_t x_offset, y_offset;
@ -360,11 +356,9 @@ WEBP_EXTERN(WebPMuxError) WebPMuxGetLoopCount(const WebPMux* const mux,
//------------------------------------------------------------------------------
// Tiling.
// Adds a tile to the mux object.
// nth=0 has a special meaning - last position.
// Adds a tile at the end of the mux object.
// Parameters:
// mux - (in/out) object to which a tile is to be added
// nth - (in) The position at which the tile is to be added.
// mux - (in/out) object to which a tile is to be added.
// bitstream - (in) the image data corresponding to the frame. It can either
// be a raw VP8/VP8L bitstream or a single-image WebP file
// (non-animated and non-tiled)
@ -374,11 +368,10 @@ WEBP_EXTERN(WebPMuxError) WebPMuxGetLoopCount(const WebPMux* const mux,
// value 0 indicates data will NOT be copied.
// Returns:
// WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or bitstream is NULL
// WEBP_MUX_NOT_FOUND - If we have less than (nth-1) tiles before adding.
// WEBP_MUX_MEMORY_ERROR - on memory allocation error.
// WEBP_MUX_OK - on success.
WEBP_EXTERN(WebPMuxError) WebPMuxSetTile(
WebPMux* const mux, uint32_t nth, const WebPData* const bitstream,
WEBP_EXTERN(WebPMuxError) WebPMuxPushTile(
WebPMux* const mux, const WebPData* const bitstream,
uint32_t x_offset, uint32_t y_offset, int copy_data);
// Gets the nth tile from the mux object.