Initial revision

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

1 files changed, 108 insertions, 0 deletions

diff --git a/libavcodec/libac3/ac3.h b/libavcodec/libac3/ac3.h
new file mode 100644
index 0000000000..117071e7a1
--- /dev/null
+++ b/libavcodec/libac3/ac3.h
@@ -0,0 +1,108 @@
+/* 
+ *    ac3.h
+ *
+ *	Copyright (C) Aaron Holtzman - May 1999
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *   
+ *  You should have received a copy of the GNU General Public License
+ *  along with GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ *
+ */
+
+typedef struct ac3_ba_s {
+    uint16_t fsnroffst;	// fine SNR offset
+    uint16_t fgaincod;	// fast gain
+    uint16_t deltbae;	// delta bit allocation exists
+    int8_t deltba[50];	// per-band delta bit allocation
+} ac3_ba_t;
+
+typedef struct ac3_state_s {
+    uint8_t fscod;		// sample rate
+    uint8_t halfrate;		// halfrate factor
+    uint8_t acmod;		// coded channels
+    float clev;			// centre channel mix level
+    float slev;			// surround channels mix level
+    uint8_t lfeon;		// coded lfe channel
+
+    int output;			// type of output
+    float level;		// output level
+    float bias;			// output bias
+
+    uint16_t cplinu;		// coupling in use
+    uint16_t chincpl[5];	// channel coupled
+    uint16_t phsflginu;		// phase flags in use (stereo only)
+    uint16_t cplbndstrc[18];	// coupling band structure
+    uint16_t cplstrtmant;	// coupling channel start mantissa
+    uint16_t cplendmant;	// coupling channel end mantissa
+    float cplco[5][18];		// coupling coordinates
+
+    // derived information
+    uint16_t cplstrtbnd;	// coupling start band (for bit allocation)
+    uint16_t ncplbnd;		// number of coupling bands
+
+    uint16_t rematflg[4];	// stereo rematrixing
+
+    uint16_t endmant[5];	// channel end mantissa
+
+    uint8_t cpl_exp[256];	// decoded coupling channel exponents
+    uint8_t fbw_exp[5][256];	// decoded channel exponents
+    uint8_t lfe_exp[7];		// decoded lfe channel exponents
+
+    uint16_t sdcycod;		// slow decay
+    uint16_t fdcycod;		// fast decay
+    uint16_t sgaincod;		// slow gain
+    uint16_t dbpbcod;		// dB per bit - encodes the dbknee value
+    uint16_t floorcod;		// masking floor
+
+    uint16_t csnroffst;		// coarse SNR offset
+    ac3_ba_t cplba;		// coupling bit allocation parameters
+    ac3_ba_t ba[5];		// channel bit allocation parameters
+    ac3_ba_t lfeba;		// lfe bit allocation parameters
+
+    uint16_t cplfleak;		// coupling fast leak init
+    uint16_t cplsleak;		// coupling slow leak init
+
+    // derived bit allocation information
+    int8_t fbw_bap[5][256];
+    int8_t cpl_bap[256];
+    int8_t lfe_bap[7];
+} ac3_state_t;
+
+/* samples work structure */
+typedef float stream_samples_t[6][256];
+
+#define AC3_CHANNEL 0
+#define AC3_MONO 1
+#define AC3_STEREO 2
+#define AC3_3F 3
+#define AC3_2F1R 4
+#define AC3_3F1R 5
+#define AC3_2F2R 6
+#define AC3_3F2R 7
+#define AC3_CHANNEL1 8
+#define AC3_CHANNEL2 9
+#define AC3_DOLBY 10
+#define AC3_CHANNEL_MASK 15
+
+#define AC3_LFE 16
+#define AC3_ADJUST_LEVEL 32
+
+void ac3_init (void);
+int ac3_syncinfo (uint8_t * buf, int * flags,
+		  int * sample_rate, int * bit_rate);
+int ac3_frame (ac3_state_t * state, uint8_t * buf, int * flags,
+	       float * level, float bias);
+int ac3_block (ac3_state_t * state);