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Refactor decoder library

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- Move common defines to dec/webpi.h
 - Regularize naming and parameters of various "CheckAndSkip" functions.
   Also they return VP8StatusCode for clarity.
 - Move WebP header/chunk parsing functions to webpi.h
 - Fix a bug in static function GetFeatures()

Change-Id: Ibc3da4ba210d860551724dc40741959750d66b89
This commit is contained in:
Urvang Joshi
2011-09-13 09:35:10 +00:00
committed by James Zern
parent 377ef43c3e
commit 76036f547e
5 changed files with 371 additions and 233 deletions
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24
src/dec/vp8i.h
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@ -288,19 +288,6 @@ struct VP8Decoder {
int VP8SetError(VP8Decoder* const dec,
VP8StatusCode error, const char * const msg);
// Validates the VP8 Header and skip over it.
// Returns 0 for invalid (chunk_size greater than riff_size) VP8 header.
// Else return 1.
// is_vp8_chunk is set to:
// 0, in case data bytes don't correspond to VP8 chunk.
// 1, in case data bytes correspond to VP8 chunk.
// -1, in case not enough bytes (partial VP8 chunk) are passed.
// chunk_size is set to the chunk size extracted from the VP8 chunk header. For
// partial VP8 chunk, chunk_size is set to 0.
int VP8CheckAndSkipHeader(const uint8_t** data_ptr, uint32_t* data_size_ptr,
int* is_vp8_chunk, uint32_t* chunk_size,
uint32_t riff_size);
// Validates the VP8 data-header and retrieve basic header information viz width
// and height. Returns 0 in case of formatting error. *width/*height/*has_alpha
// can be passed NULL.
@ -309,17 +296,6 @@ int VP8GetInfo(const uint8_t* data,
uint32_t chunk_size, // total data size expect in the chunk
int *width, int *height, int *has_alpha);
// Validates the VP8X Header and skip over it.
// Returns 0 for invalid VP8X header. Else return 1.
// is_vp8x_chunk is set to:
// 0, in case data bytes doesn't correspond to VP8X chunk.
// 1, in case data bytes correspond to VP8X chunk.
// -1, in case not enough bytes (partial VP8X chunk) are passed.
// Width, Height & Flags are set to the corresponding fields extracted from the
// VP8X chunk.
int VP8XGetInfo(const uint8_t** data_ptr, uint32_t* data_size_ptr,
int* is_vp8x_chunk, int* width, int* height, uint32_t* flags);
// in tree.c
void VP8ResetProba(VP8Proba* const proba);
void VP8ParseProba(VP8BitReader* const br, VP8Decoder* const dec);