Commit Graph

60 Commits

Author SHA1 Message Date
Pascal Massimino
f8db5d5d1c more C89-fixes
going down to strict -ansi c89 is quite overkill (no 'inline',
and /* */-style comments).
But with these fixes, the code compiles with the stringent flags:
 -Wextra -Wold-style-definition -Wmissing-prototypes
 -Wmissing-declarations and -Wdeclaration-after-statement

Change-Id: I36222f8f505bcba3d9d1309ad98b5ccb04ec17e3
2011-03-25 15:19:37 -07:00
Pascal Massimino
8bf76fe0c8 add incremental decoding
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
2011-03-23 18:33:26 -07:00
Pascal Massimino
b2c3575c8f add a 'last_y' field to WebPDecParams
this allows to keep an exact track of the last displayable pixel row

Change-Id: I590306735a82b9249e7bc9fe64eeb3e5bea3376b
2011-03-23 17:24:31 -07:00
Pascal Massimino
07dbb8d5af clarify the return logic
Change-Id: I2b5b239496da6545df2deede6d0ca28a2f9d46bf
2011-03-14 10:29:02 -07:00
Pascal Massimino
bc75213572 fix missing free()
Change-Id: Ia09869321e00bb3fb8e92e5d91993ff583dc6cdf
2011-03-13 00:22:57 -08:00
Pascal Massimino
3e856e2dd6 Extract some useful functions around decoding buffer WebPDecParams.
This is to prepare for incremental decoding.

Change-Id: Ibb1ac6c1f2d10e096c4fbcf0c06bce77b30ca457
2011-03-08 19:23:16 -08:00
Pascal Massimino
87ffa005de typo: fix a missing 'R', was confusing.
Change-Id: I769ded6058f6c7eabc97fc7a772bc44a42cd826e
2011-02-17 09:59:34 -08:00
Pascal Massimino
746a4820b9 * make (*put)() hook return a bool for abort request.
* add an enum for VP8Status() to make things clearer

Change-Id: I458aeabab93f95d28e8ee10be699b677c04b4acb
2011-02-16 14:33:16 -08:00
Pascal Massimino
73c973e6da * strengthen riff/chunk size checks
* don't consider odd-sized chunks being an error

Change-Id: I2901b071232bb996680cf155e1a25a6a9388f222
2011-02-16 13:24:55 -08:00
Pascal Massimino
6421a7a4fb move the decoder sourcetree to a sub-location src/dec
to make room for future libs sources

also extract the types declaration into its own types.h file

Change-Id: I8bae8a323a479a29375cf509792228ae6af51c7a
2011-01-06 08:57:14 -08:00