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add incremental decoding

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The object WebPIDecoder is available to store the
decoding state. The flow is typically:

   WebPIDecoder* const idec = WebPINew(mode);
   while (has_more_data) {
     // ... (get additional data)
     status = WebPIAppend(idec, new_data, new_data_size);
     if (status != VP8_STATUS_SUSPENDED ||
       break;
     }

     // The above call decodes the current available buffer.
     // Part of the image can now be refreshed by calling to
     // WebPIDecGetRGB()/WebPIDecGetYUV() etc.
   }
   WebPIDelete(idec);

Doing so, one can try and decode new macroblocks everytime fresh
bytes are available.
There's two operating modes: either appending fresh bytes, or
updating the whole buffer with additional data in the end.
The latter requires less memcpy()'s

main patch by Somnath Banerjee (somnath at google.com)

Change-Id: Ie81cbd0b50f175743af06b1f964de838b9a10a4a
This commit is contained in:
Pascal Massimino
2011-03-23 18:03:53 -07:00
parent 1f28832834
commit 8bf76fe0c8
10 changed files with 748 additions and 79 deletions
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3
makefile.unix
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@ -44,7 +44,8 @@ OBJS = src/enc/webpenc.o src/enc/bit_writer.o src/enc/syntax.o \
src/enc/quant.o src/enc/iterator.o src/enc/analysis.o \
src/enc/cost.o src/enc/picture.o src/enc/filter.o \
src/dec/bits.o src/dec/dsp.o src/dec/frame.o src/dec/webp.o \
src/dec/quant.o src/dec/tree.o src/dec/vp8.o src/dec/yuv.o
src/dec/quant.o src/dec/tree.o src/dec/vp8.o src/dec/yuv.o \
src/dec/idec.o
HDRS = src/webp/encode.h src/enc/vp8enci.h src/enc/bit_writer.h \
src/enc/cost.h src/dec/bits.h src/dec/vp8i.h src/dec/yuv.h
OUTPUT = examples/cwebp examples/dwebp src/libwebp.a