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libwebp: add WebPDemux stub functions

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beginning of a separate interface to demux webp files.

Change-Id: If8bf9c43defe5f6c8678afd03541f7cd8261c99a
This commit is contained in:
James Zern 2012-06-02 19:49:53 +00:00
parent fb47bb5cf4
commit f8f94081be
2 changed files with 72 additions and 0 deletions
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33
src/mux/demux.c Normal file
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@ -0,0 +1,33 @@
// Copyright 2012 Google Inc. All Rights Reserved.
//
// This code is licensed under the same terms as WebM:
// Software License Agreement: http://www.webmproject.org/license/software/
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// WebP container demux.
//
#include "../webp/mux.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
WebPDemuxer* WebPDemuxInternal(
const WebPData* const data, int allow_partial,
WebPDemuxState* const state, int version) {
(void)data;
(void)allow_partial;
(void)state;
(void)version;
return NULL;
}
void WebPDemuxDelete(WebPDemuxer* const dmux) {
(void)dmux;
}
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif

39
src/webp/mux.h
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@ -463,6 +463,45 @@ WEBP_EXTERN(WebPMuxError) WebPMuxNumChunks(const WebPMux* const mux,
WEBP_EXTERN(WebPMuxError) WebPMuxAssemble(WebPMux* const mux,
WebPData* const assembled_data);
//------------------------------------------------------------------------------
// Demux API.
// Enables extraction of image and extended format data from WebP files.
#define WEBP_DEMUX_ABI_VERSION 0x0000
typedef struct WebPDemuxer WebPDemuxer;
typedef enum {
WEBP_DEMUX_PARSING_HEADER, // Not enough data to parse full header.
WEBP_DEMUX_PARSED_HEADER, // Header parsing complete, data may be available.
WEBP_DEMUX_DONE // Entire file has been parsed.
} WebPDemuxState;
//------------------------------------------------------------------------------
// Life of a Demux object
// Internal, version-checked, entry point
WEBP_EXTERN(WebPDemuxer*) WebPDemuxInternal(
const WebPData* const, int, WebPDemuxState* const, int);
// Parses the WebP file given by 'data'.
// A complete WebP file must be present in 'data' for the function to succeed.
// Returns a WebPDemuxer object on successful parse, NULL otherwise.
static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* const data) {
return WebPDemuxInternal(data, 0, NULL, WEBP_DEMUX_ABI_VERSION);
}
// Parses the WebP file given by 'data'.
// If 'state' is non-NULL it will be set to indicate the status of the demuxer.
// Returns a WebPDemuxer object on successful parse, NULL otherwise.
static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
const WebPData* const data, WebPDemuxState* const state) {
return WebPDemuxInternal(data, 1, state, WEBP_DEMUX_ABI_VERSION);
}
// Frees memory associated with 'dmux'.
WEBP_EXTERN(void) WebPDemuxDelete(WebPDemuxer* const dmux);
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)