[FFmpeg-cvslog] Implement lms_predict()

[Mashiat Sarker Shakkhar]

ffmpeg | branch: master | Mashiat Sarker Shakkhar <shahriman_ams at yahoo.com> | Sun Nov  6 03:02:11 2011 +0600| [afd930dca23adad09ffbf6f9ff35b7258047895a] | committer: Michael Niedermayer

Implement lms_predict()
(cherry picked from commit 83e31db195b9d0a07b0526eab5780817d8ce9444)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=afd930dca23adad09ffbf6f9ff35b7258047895a
---

 libavcodec/wmalosslessdec.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c
index a60f477..8f7f290 100644
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@@ -757,6 +757,23 @@ static void reset_codec(WmallDecodeCtx *s)
 
 
 
+static int lms_predict(WmallDecodeCtx *s, int ich, int ilms)
+{
+    int32_t pred, icoef;
+    int recent = s->cdlms[ich][ilms].recent;
+
+    for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
+        pred += s->cdlms[ich][ilms].coefs[icoef] *
+                    s->cdlms[ich][ilms].lms_prevvalues[icoef + recent];
+
+    pred += (1 << (s->cdlms[ich][ilms].scaling - 1));
+    /* XXX: Table 29 has:
+            iPred >= cdlms[iCh][ilms].scaling;
+       seems to me like a missing > */
+    pred >>= s->cdlms[ich][ilms].scaling;
+    return pred;
+}
+
 /**
  *@brief Decode a single subframe (block).
  *@param s codec context