[FFmpeg-cvslog] r21063 - trunk/libavcodec/h263.c

michael subversion
Thu Jan 7 16:43:49 CET 2010


Author: michael
Date: Thu Jan  7 16:43:49 2010
New Revision: 21063

Log:
Doxument decide_ac_pred() and restore_ac_coeffs().

Modified:
   trunk/libavcodec/h263.c

Modified: trunk/libavcodec/h263.c
==============================================================================
--- trunk/libavcodec/h263.c	Thu Jan  7 16:31:54 2010	(r21062)
+++ trunk/libavcodec/h263.c	Thu Jan  7 16:43:49 2010	(r21063)
@@ -368,6 +368,15 @@ static inline int get_block_rate(MpegEnc
     return rate;
 }
 
+
+/**
+ * Restores the ac coefficients in block that have been changed by decide_ac_pred().
+ * This function also restores s->block_last_index.
+ * @param[in,out] block MB coefficients, these will be restored
+ * @param[in] dir ac prediction direction for each 8x8 block
+ * @param[out] st scantable for each 8x8 block
+ * @param[in] zigzag_last_index index refering to the last non zero coefficient in zigzag order
+ */
 static inline void restore_ac_coeffs(MpegEncContext * s, DCTELEM block[6][64], int dir[6], uint8_t *st[6], int zigzag_last_index[6])
 {
     int i, n;
@@ -393,6 +402,11 @@ static inline void restore_ac_coeffs(Mpe
 
 /**
  * Returns the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
+ * This function will also update s->block_last_index and s->ac_val.
+ * @param[in,out] block MB coefficients, these will be updated if 1 is returned
+ * @param[in] dir ac prediction direction for each 8x8 block
+ * @param[out] st scantable for each 8x8 block
+ * @param[out] zigzag_last_index index refering to the last non zero coefficient in zigzag order
  */
 static inline int decide_ac_pred(MpegEncContext * s, DCTELEM block[6][64], int dir[6], uint8_t *st[6], int zigzag_last_index[6])
 {



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