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dwebp: move webp decoding to example_util

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this will allow reuse by cwebp

Change-Id: I667252fdacfc5436112d21b040ca299273ec1515
This commit is contained in:
James Zern
2014-04-22 19:33:22 -07:00
parent c0220460e9
commit 4a0e73904d
4 changed files with 112 additions and 46 deletions
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77
examples/example_util.c
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@ -15,6 +15,9 @@
#include <stdlib.h>
#include <string.h>
#include "webp/decode.h"
#include "./stopwatch.h"
// -----------------------------------------------------------------------------
// File I/O
@ -107,3 +110,77 @@ int ExUtilWriteFile(const char* const file_name,
return ok;
}
//------------------------------------------------------------------------------
// WebP decoding
static const char* const kStatusMessages[] = {
"OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR",
"UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA"
};
void ExUtilPrintWebPError(const char* const in_file, int status) {
fprintf(stderr, "Decoding of %s failed.\n", in_file);
fprintf(stderr, "Status: %d", status);
if (status >= VP8_STATUS_OK && status <= VP8_STATUS_NOT_ENOUGH_DATA) {
fprintf(stderr, "(%s)", kStatusMessages[status]);
}
fprintf(stderr, "\n");
}
int ExUtilLoadWebP(const char* const in_file,
const uint8_t** data, size_t* data_size,
WebPBitstreamFeatures* bitstream) {
VP8StatusCode status;
if (!ExUtilReadFile(in_file, data, data_size)) return 0;
status = WebPGetFeatures(*data, *data_size, bitstream);
if (status != VP8_STATUS_OK) {
free((void*)*data);
*data = NULL;
*data_size = 0;
ExUtilPrintWebPError(in_file, status);
return 0;
}
return 1;
}
VP8StatusCode ExUtilDecodeWebP(const uint8_t* const data, size_t data_size,
int incremental, int verbose,
WebPDecoderConfig* const config) {
Stopwatch stop_watch;
VP8StatusCode status = VP8_STATUS_OK;
if (config == NULL) return 0;
if (verbose) {
StopwatchReset(&stop_watch);
}
if (config->input.has_animation) {
fprintf(stderr,
"Error! Decoding of an animated WebP file is not supported.\n"
" Use webpmux to extract the individual frames or\n"
" vwebp to view this image.\n");
}
// Decoding call.
if (!incremental) {
status = WebPDecode(data, data_size, config);
} else {
WebPIDecoder* const idec = WebPIDecode(data, data_size, config);
if (idec == NULL) {
fprintf(stderr, "Failed during WebPINewDecoder().\n");
return VP8_STATUS_OUT_OF_MEMORY;
} else {
status = WebPIUpdate(idec, data, data_size);
WebPIDelete(idec);
}
}
if (verbose) {
const double decode_time = StopwatchReadAndReset(&stop_watch);
fprintf(stderr, "Time to decode picture: %.3fs\n", decode_time);
}
return status;
}
// -----------------------------------------------------------------------------