commit 73edeb03ea1730d3a602a888fc9beb2141d951d4
author Dmitry Kovalev <dkovalev@google.com> Wed Aug 20 17:02:10 2014 -0700
committer Dmitry Kovalev <dkovalev@google.com> Thu Aug 28 13:51:37 2014 -0700
tree aba54022795b04f5773c3cbc6c50b88fed11012d
parent e9d106bd4571010c2224b2fcfdb69e50aa888494

Removing alg_priv from vpx_codec_priv struct.

In order to understand memory layout consider the declaration of the
following structs. The first one is a part of our API:

struct vpx_codec_ctx {
  // ...
  struct vpx_codec_priv *priv;
};

The second one is defined in vpx_codec_internal.h:

struct vpx_codec_priv {
  // ...
};

The following struct is defined 4 times for encoder/decoder VP8/VP9:

struct vpx_codec_alg_priv {
  struct vpx_codec_priv base;
  // ... 
};

Private data allocation for the given ctx:

struct vpx_codec_ctx *ctx = <get>
struct vpx_codec_alg_priv *alg_priv = <allocate>
ctx->priv = (struct vpx_codec_priv *)alg_priv;

The cast works because vpx_codec_alg_priv has a
vpx_codec_priv instance as a first member 'base'.

Change-Id: I10d1afc8c9a7dfda50baade8c7b0296678bdb0d0