libdts support by (Benjamin Zores <ben at geexbox dot org>)

Originally committed as revision 3310 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 203 insertions, 0 deletions

diff --git a/libavcodec/dts_internal.h b/libavcodec/dts_internal.h
new file mode 100644
index 0000000000..e834e96a89
--- /dev/null
+++ b/libavcodec/dts_internal.h
@@ -0,0 +1,203 @@
+/*
+ * dts_internal.h
+ * Copyright (C) 2004 Gildas Bazin <gbazin@videolan.org>
+ * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of dtsdec, a free DTS Coherent Acoustics stream decoder.
+ * See http://www.videolan.org/dtsdec.html for updates.
+ *
+ * dtsdec 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.
+ *
+ * dtsdec 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
+ */
+
+#define DTS_SUBFRAMES_MAX (16)
+#define DTS_PRIM_CHANNELS_MAX (5)
+#define DTS_SUBBANDS (32)
+#define DTS_ABITS_MAX (32) /* Should be 28 */
+#define DTS_SUBSUBFAMES_MAX (4)
+#define DTS_LFE_MAX (3)
+
+struct dts_state_s {
+
+    /* Frame header */
+    int frame_type;             /* type of the current frame */
+    int samples_deficit;        /* deficit sample count */
+    int crc_present;            /* crc is present in the bitstream */
+    int sample_blocks;          /* number of PCM sample blocks */
+    int frame_size;             /* primary frame byte size */
+    int amode;                  /* audio channels arrangement */
+    int sample_rate;            /* audio sampling rate */
+    int bit_rate;               /* transmission bit rate */
+
+    int downmix;                /* embedded downmix enabled */
+    int dynrange;               /* embedded dynamic range flag */
+    int timestamp;              /* embedded time stamp flag */
+    int aux_data;               /* auxiliary data flag */
+    int hdcd;                   /* source material is mastered in HDCD */
+    int ext_descr;              /* extension audio descriptor flag */
+    int ext_coding;             /* extended coding flag */
+    int aspf;                   /* audio sync word insertion flag */
+    int lfe;                    /* low frequency effects flag */
+    int predictor_history;      /* predictor history flag */
+    int header_crc;             /* header crc check bytes */
+    int multirate_inter;        /* multirate interpolator switch */
+    int version;                /* encoder software revision */
+    int copy_history;           /* copy history */
+    int source_pcm_res;         /* source pcm resolution */
+    int front_sum;              /* front sum/difference flag */
+    int surround_sum;           /* surround sum/difference flag */
+    int dialog_norm;            /* dialog normalisation parameter */
+
+    /* Primary audio coding header */
+    int subframes;              /* number of subframes */
+    int prim_channels;          /* number of primary audio channels */
+    /* subband activity count */
+    int subband_activity[DTS_PRIM_CHANNELS_MAX];
+    /* high frequency vq start subband */
+    int vq_start_subband[DTS_PRIM_CHANNELS_MAX];
+    /* joint intensity coding index */
+    int joint_intensity[DTS_PRIM_CHANNELS_MAX];
+    /* transient mode code book */
+    int transient_huffman[DTS_PRIM_CHANNELS_MAX];
+    /* scale factor code book */
+    int scalefactor_huffman[DTS_PRIM_CHANNELS_MAX];
+    /* bit allocation quantizer select */
+    int bitalloc_huffman[DTS_PRIM_CHANNELS_MAX];
+    /* quantization index codebook select */
+    int quant_index_huffman[DTS_PRIM_CHANNELS_MAX][DTS_ABITS_MAX];
+    /* scale factor adjustment */
+    float scalefactor_adj[DTS_PRIM_CHANNELS_MAX][DTS_ABITS_MAX];
+
+    /* Primary audio coding side information */
+    int subsubframes;           /* number of subsubframes */
+    int partial_samples;        /* partial subsubframe samples count */
+    /* prediction mode (ADPCM used or not) */
+    int prediction_mode[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
+    /* prediction VQ coefs */
+    int prediction_vq[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
+    /* bit allocation index */
+    int bitalloc[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
+    /* transition mode (transients) */
+    int transition_mode[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
+    /* scale factors (2 if transient)*/
+    int scale_factor[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS][2];
+    /* joint subband scale factors codebook */
+    int joint_huff[DTS_PRIM_CHANNELS_MAX];
+    /* joint subband scale factors */
+    int joint_scale_factor[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
+    /* stereo downmix coefficients */
+    int downmix_coef[DTS_PRIM_CHANNELS_MAX][2];
+    /* dynamic range coefficient */
+    int dynrange_coef;
+
+    /* VQ encoded high frequency subbands */
+    int high_freq_vq[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
+
+    /* Low frequency effect data */
+    double lfe_data[2*DTS_SUBSUBFAMES_MAX*DTS_LFE_MAX * 2 /*history*/];
+    int lfe_scale_factor;
+
+    /* Subband samples history (for ADPCM) */
+    double subband_samples_hist[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS][4];
+    double subband_fir_hist[DTS_PRIM_CHANNELS_MAX][512];
+    double subband_fir_noidea[DTS_PRIM_CHANNELS_MAX][64];
+
+    /* Audio output */
+    level_t clev;            /* centre channel mix level */
+    level_t slev;            /* surround channels mix level */
+
+    int output;              /* type of output */
+    level_t level;           /* output level */
+    sample_t bias;           /* output bias */
+
+    sample_t * samples;      /* pointer to the internal audio samples buffer */
+    int downmixed;
+
+    int dynrnge;             /* apply dynamic range */
+    level_t dynrng;          /* dynamic range */
+    void * dynrngdata;       /* dynamic range callback funtion and data */
+    level_t (* dynrngcall) (level_t range, void * dynrngdata);
+
+    /* Bitstream handling */
+    uint32_t * buffer_start;
+    uint32_t bits_left;
+    uint32_t current_word;
+    int      word_mode;         /* 16/14 bits word format (1 -> 16, 0 -> 14) */
+    int      bigendian_mode;    /* endianness (1 -> be, 0 -> le) */
+
+    /* Current position in DTS frame */
+    int current_subframe;
+    int current_subsubframe;
+
+    /* Pre-calculated cosine modulation coefs for the QMF */
+    double cos_mod[544];
+
+    /* Debug flag */
+    int debug_flag;
+};
+
+#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
+
+int dts_downmix_init (int input, int flags, level_t * level,
+                      level_t clev, level_t slev);
+int dts_downmix_coeff (level_t * coeff, int acmod, int output, level_t level,
+                       level_t clev, level_t slev);
+void dts_downmix (sample_t * samples, int acmod, int output, sample_t bias,
+                  level_t clev, level_t slev);
+void dts_upmix (sample_t * samples, int acmod, int output);
+
+#define ROUND(x) ((int)((x) + ((x) > 0 ? 0.5 : -0.5)))
+
+#ifndef LIBDTS_FIXED
+
+typedef sample_t quantizer_t;
+#define SAMPLE(x) (x)
+#define LEVEL(x) (x)
+#define MUL(a,b) ((a) * (b))
+#define MUL_L(a,b) ((a) * (b))
+#define MUL_C(a,b) ((a) * (b))
+#define DIV(a,b) ((a) / (b))
+#define BIAS(x) ((x) + bias)
+
+#else /* LIBDTS_FIXED */
+
+typedef int16_t quantizer_t;
+#define SAMPLE(x) (sample_t)((x) * (1 << 30))
+#define LEVEL(x) (level_t)((x) * (1 << 26))
+
+#if 0
+#define MUL(a,b) ((int)(((int64_t)(a) * (b) + (1 << 29)) >> 30))
+#define MUL_L(a,b) ((int)(((int64_t)(a) * (b) + (1 << 25)) >> 26))
+#elif 1
+#define MUL(a,b) \
+({ int32_t _ta=(a), _tb=(b), _tc; \
+   _tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)(((_tc >> 14))+ (((_ta >> 16)*(_tb >> 16)) << 2 )); })
+#define MUL_L(a,b) \
+({ int32_t _ta=(a), _tb=(b), _tc; \
+   _tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)((_tc >> 10) + (((_ta >> 16)*(_tb >> 16)) << 6)); })
+#else
+#define MUL(a,b) (((a) >> 15) * ((b) >> 15))
+#define MUL_L(a,b) (((a) >> 13) * ((b) >> 13))
+#endif
+
+#define MUL_C(a,b) MUL_L (a, LEVEL (b))
+#define DIV(a,b) ((((int64_t)LEVEL (a)) << 26) / (b))
+#define BIAS(x) (x)
+
+#endif