* add support for liba52

Originally committed as revision 411 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 115 insertions, 0 deletions

diff --git a/libavcodec/liba52/a52_internal.h b/libavcodec/liba52/a52_internal.h
new file mode 100644
index 0000000..f677e37
--- /dev/null
+++ b/libavcodec/liba52/a52_internal.h
@@ -0,0 +1,115 @@
+/*
+ * a52_internal.h
+ * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of a52dec, a free ATSC A-52 stream decoder.
+ * See http://liba52.sourceforge.net/ for updates.
+ *
+ * a52dec 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 of the License, or
+ * (at your option) any later version.
+ *
+ * a52dec 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+typedef struct {
+    uint8_t bai;		/* fine SNR offset, fast gain */
+    uint8_t deltbae;		/* delta bit allocation exists */
+    int8_t deltba[50];		/* per-band delta bit allocation */
+} ba_t;
+
+typedef struct {
+    uint8_t exp[256];		/* decoded channel exponents */
+    int8_t bap[256];		/* derived channel bit allocation */
+} expbap_t;
+
+struct a52_state_s {
+    uint8_t fscod;		/* sample rate */
+    uint8_t halfrate;		/* halfrate factor */
+    uint8_t acmod;		/* coded channels */
+    uint8_t lfeon;		/* coded lfe channel */
+    sample_t clev;		/* centre channel mix level */
+    sample_t slev;		/* surround channels mix level */
+
+    int output;			/* type of output */
+    sample_t level;		/* output level */
+    sample_t bias;		/* output bias */
+
+    int dynrnge;		/* apply dynamic range */
+    sample_t dynrng;		/* dynamic range */
+    void * dynrngdata;		/* dynamic range callback funtion and data */
+    sample_t (* dynrngcall) (sample_t range, void * dynrngdata);
+
+    uint8_t chincpl;		/* channel coupled */
+    uint8_t phsflginu;		/* phase flags in use (stereo only) */
+    uint8_t cplstrtmant;	/* coupling channel start mantissa */
+    uint8_t cplendmant;		/* coupling channel end mantissa */
+    uint32_t cplbndstrc;	/* coupling band structure */
+    sample_t cplco[5][18];	/* coupling coordinates */
+
+    /* derived information */
+    uint8_t cplstrtbnd;		/* coupling start band (for bit allocation) */
+    uint8_t ncplbnd;		/* number of coupling bands */
+
+    uint8_t rematflg;		/* stereo rematrixing */
+
+    uint8_t endmant[5];		/* channel end mantissa */
+
+    uint16_t bai;		/* bit allocation information */
+
+    uint8_t csnroffst;		/* coarse SNR offset */
+    ba_t cplba;			/* coupling bit allocation parameters */
+    ba_t ba[5];			/* channel bit allocation parameters */
+    ba_t lfeba;			/* lfe bit allocation parameters */
+
+    uint8_t cplfleak;		/* coupling fast leak init */
+    uint8_t cplsleak;		/* coupling slow leak init */
+
+    expbap_t cpl_expbap;
+    expbap_t fbw_expbap[5];
+    expbap_t lfe_expbap;
+
+    sample_t * samples;
+    int downmixed;
+};
+
+#define LEVEL_PLUS6DB 2.0
+#define LEVEL_PLUS3DB 1.4142135623730951
+#define LEVEL_3DB 0.7071067811865476
+#define LEVEL_45DB 0.5946035575013605
+#define LEVEL_6DB 0.5
+
+#define EXP_REUSE (0)
+#define EXP_D15   (1)
+#define EXP_D25   (2)
+#define EXP_D45   (3)
+
+#define DELTA_BIT_REUSE (0)
+#define DELTA_BIT_NEW (1)
+#define DELTA_BIT_NONE (2)
+#define DELTA_BIT_RESERVED (3)
+
+void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart,
+		       int start, int end, int fastleak, int slowleak,
+		       expbap_t * expbap);
+
+int a52_downmix_init (int input, int flags, sample_t * level,
+		      sample_t clev, sample_t slev);
+int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level,
+		       sample_t clev, sample_t slev);
+void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,
+		  sample_t clev, sample_t slev);
+void a52_upmix (sample_t * samples, int acmod, int output);
+
+void a52_imdct_init (uint32_t mm_accel);
+void a52_imdct_256 (sample_t * data, sample_t * delay, sample_t bias);
+void a52_imdct_512 (sample_t * data, sample_t * delay, sample_t bias);