Initial revision

Originally committed as revision 5 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 32 insertions, 0 deletions

diff --git a/libavcodec/ac3enc.h b/libavcodec/ac3enc.h
new file mode 100644
index 0000000000..40cc53aced
--- /dev/null
+++ b/libavcodec/ac3enc.h
@@ -0,0 +1,32 @@
+
+#define AC3_FRAME_SIZE (6*256)
+#define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */
+#define AC3_MAX_CHANNELS 2 /* we handle at most two channels, although
+                              AC3 allows 6 channels */
+
+typedef struct AC3EncodeContext {
+    PutBitContext pb;
+    int nb_channels;
+    int bit_rate;
+    int sample_rate;
+    int bsid;
+    int frame_size_min; /* minimum frame size in case rounding is necessary */
+    int frame_size; /* current frame size in words */
+    int halfratecod;
+    int frmsizecod;
+    int fscod; /* frequency */
+    int acmod;
+    int bsmod;
+    short last_samples[AC3_MAX_CHANNELS][256];
+    int chbwcod[AC3_MAX_CHANNELS];
+    int nb_coefs[AC3_MAX_CHANNELS];
+    
+    /* bitrate allocation control */
+    int sgaincod, sdecaycod, fdecaycod, dbkneecod, floorcod; 
+    int sgain, sdecay, fdecay, dbknee, floor;
+    int csnroffst;
+    int fgaincod[AC3_MAX_CHANNELS];
+    int fsnroffst[AC3_MAX_CHANNELS];
+    /* mantissa encoding */
+    int mant1_cnt, mant2_cnt, mant4_cnt;
+} AC3EncodeContext;