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WebPMuxAssemble() returns WebPData*.

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Also add an API 'WebPDataFree()'

Change-Id: I00dc4c67fd78a541a18aaf0e65b8ef62d9769803
This commit is contained in:
Urvang Joshi 2012-06-07 11:04:57 +05:30
parent 814a063925
commit f1df5587d9
5 changed files with 51 additions and 45 deletions
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6
README.mux
View File

@ -81,10 +81,10 @@ profile & XMP metadata.
// ... (Prepare XMP metadata).
WebPMuxSetMetadata(mux, &xmp, copy_data);
// Get data from mux in WebP RIFF format.
WebPMuxAssemble(mux, &output_data, &output_data_size);
WebPMuxAssemble(mux, &output_data);
WebPMuxDelete(mux);
// ... (Consume output_data; e.g. write output_data to file).
free(output_data);
// ... (Consume output_data; e.g. write output_data.bytes_ to file).
WebPDataClear(&output_data);
Example#2 (pseudo code): Get image & color profile data from a WebP file.

36
examples/webpmux.c
View File

@ -135,12 +135,6 @@ static int WebPDataCopy(const WebPData* const src, WebPData* const dst) {
return 1;
}
// Frees data allocated by WebPDataCopy.
static void WebPDataFree(WebPData* const webpdata) {
free((void*)webpdata->bytes_);
memset(webpdata, 0, sizeof(*webpdata));
}
#define RETURN_IF_ERROR(ERR_MSG) \
if (err != WEBP_MUX_OK) { \
fprintf(stderr, ERR_MSG); \
@ -370,8 +364,8 @@ static int ReadImage(const char* filename,
if (!ok) {
fprintf(stderr, "Error allocating storage for image (%zu bytes) "
"and alpha (%zu bytes) data\n", image.size_, alpha.size_);
WebPDataFree(image_ptr);
WebPDataFree(alpha_ptr);
WebPDataClear(image_ptr);
WebPDataClear(alpha_ptr);
}
} else {
fprintf(stderr, "Failed to extract image data from file %s. Error: %d\n",
@ -399,17 +393,15 @@ static int WriteData(const char* filename, const WebPData* const webpdata) {
}
static int WriteWebP(WebPMux* const mux, const char* filename) {
WebPData webpdata;
int ok;
const WebPMuxError err = WebPMuxAssemble(
mux, (uint8_t**)&webpdata.bytes_, &webpdata.size_);
WebPData webp_data;
const WebPMuxError err = WebPMuxAssemble(mux, &webp_data);
if (err != WEBP_MUX_OK) {
fprintf(stderr, "Error (%d) assembling the WebP file.\n", err);
return 0;
}
ok = WriteData(filename, &webpdata);
WebPDataFree(&webpdata);
ok = WriteData(filename, &webp_data);
WebPDataClear(&webp_data);
return ok;
}
@ -862,14 +854,14 @@ static int Process(const WebPMuxConfig* config) {
ok = ParseFrameArgs(feature->args_[index].params_,
&x_offset, &y_offset, &duration);
if (!ok) {
WebPDataFree(&image);
WebPDataFree(&alpha);
WebPDataClear(&image);
WebPDataClear(&alpha);
ERROR_GOTO1("ERROR: Could not parse frame properties.\n", Err2);
}
err = WebPMuxSetFrame(mux, 0, &image, &alpha,
x_offset, y_offset, duration, 1);
WebPDataFree(&image);
WebPDataFree(&alpha);
WebPDataClear(&image);
WebPDataClear(&alpha);
if (err != WEBP_MUX_OK) {
ERROR_GOTO3("ERROR#%d: Could not add a frame at index %d.\n",
err, index, Err2);
@ -893,13 +885,13 @@ static int Process(const WebPMuxConfig* config) {
ok = ParseTileArgs(feature->args_[index].params_, &x_offset,
&y_offset);
if (!ok) {
WebPDataFree(&image);
WebPDataFree(&alpha);
WebPDataClear(&image);
WebPDataClear(&alpha);
ERROR_GOTO1("ERROR: Could not parse tile properties.\n", Err2);
}
err = WebPMuxSetTile(mux, 0, &image, &alpha, x_offset, y_offset, 1);
WebPDataFree(&image);
WebPDataFree(&alpha);
WebPDataClear(&image);
WebPDataClear(&alpha);
if (err != WEBP_MUX_OK) {
ERROR_GOTO3("ERROR#%d: Could not add a tile at index %d.\n",
err, index, Err2);

14
src/mux/muxedit.c
View File

@ -270,7 +270,8 @@ WebPMuxError WebPMuxSetImage(WebPMux* const mux,
// Add image chunk.
ChunkInit(&chunk);
err = ChunkAssignDataImageInfo(&chunk, &image_raw, NULL, copy_data, image_tag);
err = ChunkAssignDataImageInfo(&chunk, &image_raw, NULL, copy_data,
image_tag);
if (err != WEBP_MUX_OK) return err;
err = ChunkSetNth(&chunk, &wpi.img_, 1);
if (err != WEBP_MUX_OK) return err;
@ -645,7 +646,7 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
}
WebPMuxError WebPMuxAssemble(WebPMux* const mux,
uint8_t** output_data, size_t* output_size) {
WebPData* const assembled_data) {
size_t size = 0;
uint8_t* data = NULL;
uint8_t* dst = NULL;
@ -653,13 +654,10 @@ WebPMuxError WebPMuxAssemble(WebPMux* const mux,
int num_loop_chunks;
WebPMuxError err;
if (mux == NULL || output_data == NULL || output_size == NULL) {
if (mux == NULL || assembled_data == NULL) {
return WEBP_MUX_INVALID_ARGUMENT;
}
*output_data = NULL;
*output_size = 0;
// Remove LOOP chunk if unnecessary.
err = WebPMuxNumNamedElements(mux, kChunks[IDX_LOOP].name,
&num_loop_chunks);
@ -715,8 +713,8 @@ WebPMuxError WebPMuxAssemble(WebPMux* const mux,
}
// Finalize.
*output_data = data;
*output_size = size;
assembled_data->bytes_ = data;
assembled_data->size_ = size;
return err;
}

10
src/mux/muxinternal.c
View File

@ -225,6 +225,16 @@ uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst) {
return dst;
}
//------------------------------------------------------------------------------
// Life of a WebPData object.
void WebPDataClear(WebPData* const webp_data) {
if (webp_data != NULL) {
free((void*)webp_data->bytes_);
memset(webp_data, 0, sizeof(*webp_data));
}
}
//------------------------------------------------------------------------------
// Life of a MuxImage object.

28
src/webp/mux.h
View File

@ -24,10 +24,10 @@
// // ... (Prepare XMP metadata).
// WebPMuxSetMetadata(mux, &xmp, copy_data);
// // Get data from mux in WebP RIFF format.
// WebPMuxAssemble(mux, &output_data, &output_data_size);
// WebPMuxAssemble(mux, &output_data);
// WebPMuxDelete(mux);
// // ... (Consume output_data; e.g. write output_data to file).
// free(output_data);
// // ... (Consume output_data; e.g. write output_data.bytes_ to file).
// WebPDataClear(&output_data);
//
// Code Example#2: Get image & color profile data from a WebP file.
//
@ -88,6 +88,13 @@ typedef struct {
size_t size_;
} WebPData;
//------------------------------------------------------------------------------
// Life of a WebPData object.
// Clears the contents of the 'webp_data' object by calling free(). Does not
// deallocate the object itself.
WEBP_EXTERN(void) WebPDataClear(WebPData* const webp_data);
//------------------------------------------------------------------------------
// Life of a Mux object
@ -438,15 +445,15 @@ WEBP_EXTERN(WebPMuxError) WebPMuxNumNamedElements(const WebPMux* const mux,
const char* name,
int* num_elements);
// Assembles all chunks in WebP RIFF format and returns in output_data.
// Assembles all chunks in WebP RIFF format and returns in 'assembled_data'.
// This function also validates the mux object.
// The content of '*output_data' is allocated using malloc(), and NOT
// owned by the 'mux' object.
// It MUST be deallocated by the caller by calling free().
// Note: The content of 'assembled_data' will be ignored and overwritten.
// Also, the content of 'assembled_data' is allocated using malloc(), and NOT
// owned by the 'mux' object. It MUST be deallocated by the caller by calling
// WebPDataClear().
// Parameters:
// mux - (in/out) object whose chunks are to be assembled
// output_data - (out) byte array where assembled WebP data is returned
// output_size - (out) size of returned data
// assembled_data - (out) assembled WebP data
// Returns:
// WEBP_MUX_BAD_DATA - if mux object is invalid.
// WEBP_MUX_INVALID_ARGUMENT - if either mux, output_data or output_size is
@ -454,8 +461,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxNumNamedElements(const WebPMux* const mux,
// WEBP_MUX_MEMORY_ERROR - on memory allocation error.
// WEBP_MUX_OK - on success
WEBP_EXTERN(WebPMuxError) WebPMuxAssemble(WebPMux* const mux,
uint8_t** output_data,
size_t* output_size);
WebPData* const assembled_data);
//------------------------------------------------------------------------------