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Add support for raw lossless bitstream in decoder.

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Previously, it used to assume any raw bitstream is a VP8 one.

Also,
- Factor out VP8CheckSignature() & VP8LCheckSignature().
- Use a local var for *data_ptr in ParseVP8Header() for
readability.

Change-Id: I0fa8aa177dad7865e00c8898f7e7ce76a9db19d5
This commit is contained in:
Urvang Joshi
2012-05-31 11:16:32 +05:30
parent 7cbee29afa
commit 9ef3228301
5 changed files with 37 additions and 16 deletions
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10
src/dec/vp8l.c
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@ -78,11 +78,15 @@ static int DecodeImageStream(int xsize, int ysize,
//------------------------------------------------------------------------------
int VP8LCheckSignature(const uint8_t* const data, size_t size) {
return (size >= 1) &&
(data[0] == VP8L_MAGIC_BYTE || data[0] == VP8L_MAGIC_BYTE_RSVD);
}
static int ReadImageSize(VP8LBitReader* const br,
int* const width, int* const height) {
const int signature = VP8LReadBits(br, 8);
if (signature != VP8L_MAGIC_BYTE &&
signature != VP8L_MAGIC_BYTE_RSVD) {
const uint8_t signature = VP8LReadBits(br, 8);
if (!VP8LCheckSignature(&signature, 1)) {
return 0;
}
*width = VP8LReadBits(br, VP8L_IMAGE_SIZE_BITS) + 1;