dca: Support for XLL (lossless extension)

Cleanup and integration by Diego Biurrun.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 99 insertions, 2 deletions

diff --git a/libavcodec/dca.h b/libavcodec/dca.h
index 54643c99a5..887eb375f2 100644
--- a/libavcodec/dca.h
+++ b/libavcodec/dca.h
@@ -42,6 +42,21 @@
 #define DCA_BLOCKS_MAX        (16)
 #define DCA_LFE_MAX            (3)
 
+#define DCA_PRIM_CHANNELS_MAX  (7)
+#define DCA_ABITS_MAX         (32)      /* Should be 28 */
+#define DCA_SUBSUBFRAMES_MAX   (4)
+#define DCA_SUBFRAMES_MAX     (16)
+#define DCA_BLOCKS_MAX        (16)
+#define DCA_LFE_MAX            (3)
+#define DCA_XLL_FBANDS_MAX     (4)
+#define DCA_XLL_SEGMENTS_MAX  (16)
+#define DCA_XLL_CHSETS_MAX    (16)
+#define DCA_XLL_CHANNELS_MAX  (16)
+#define DCA_XLL_AORDER_MAX    (15)
+
+/* Arbitrary limit; not sure what the maximum really is, but much larger. */
+#define DCA_XLL_DMIX_NCOEFFS_MAX (18)
+
 #define DCA_MAX_FRAME_SIZE       16384
 #define DCA_MAX_EXSS_HEADER_SIZE  4096
 
@@ -60,6 +75,61 @@ enum DCAExtensionMask {
     DCA_EXT_EXSS_XLL   = 0x200, ///< lossless extension in ExSS
 };
 
+typedef struct XllChSetSubHeader {
+    int channels;               ///< number of channels in channel set, at most 16
+    int residual_encode;        ///< residual channel encoding
+    int bit_resolution;         ///< input sample bit-width
+    int bit_width;              ///< original input sample bit-width
+    int sampling_frequency;     ///< sampling frequency
+    int samp_freq_interp;       ///< sampling frequency interpolation multiplier
+    int replacement_set;        ///< replacement channel set group
+    int active_replace_set;     ///< current channel set is active channel set
+    int primary_ch_set;
+    int downmix_coeff_code_embedded;
+    int downmix_embedded;
+    int downmix_type;
+    int hier_chset;             ///< hierarchical channel set
+    int downmix_ncoeffs;
+    int downmix_coeffs[DCA_XLL_DMIX_NCOEFFS_MAX];
+    int ch_mask_enabled;
+    int ch_mask;
+    int mapping_coeffs_present;
+    int num_freq_bands;
+
+    /* m_nOrigChanOrder */
+    uint8_t orig_chan_order[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
+    uint8_t orig_chan_order_inv[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
+    /* Coefficients for channel pairs (at most 8), m_anPWChPairsCoeffs */
+    int8_t pw_ch_pairs_coeffs[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX/2];
+    /* m_nCurrHighestLPCOrder */
+    uint8_t adapt_order_max[DCA_XLL_FBANDS_MAX];
+    /* m_pnAdaptPredOrder */
+    uint8_t adapt_order[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
+    /* m_pnFixedPredOrder */
+    uint8_t fixed_order[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
+    /* m_pnLPCReflCoeffsQInd, unsigned version */
+    uint8_t lpc_refl_coeffs_q_ind[DCA_XLL_FBANDS_MAX]
+                                 [DCA_XLL_CHANNELS_MAX][DCA_XLL_AORDER_MAX];
+
+    int lsb_fsize[DCA_XLL_FBANDS_MAX];
+    int8_t scalable_lsbs[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
+    int8_t bit_width_adj_per_ch[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
+} XllChSetSubHeader;
+
+typedef struct XllNavi {
+    GetBitContext gb;  // Context for parsing the data segments
+    unsigned band_size[DCA_XLL_FBANDS_MAX];
+    unsigned segment_size[DCA_XLL_FBANDS_MAX][DCA_XLL_SEGMENTS_MAX];
+    unsigned chset_size[DCA_XLL_FBANDS_MAX][DCA_XLL_SEGMENTS_MAX][DCA_XLL_CHSETS_MAX];
+} XllNavi;
+
+typedef struct QMF64_table {
+    float dct4_coeff[32][32];
+    float dct2_coeff[32][32];
+    float rcos[32];
+    float rsin[32];
+} QMF64_table;
+
 typedef struct DCAContext {
     AVClass *class;             ///< class for AVOptions
     AVCodecContext *avctx;
@@ -132,8 +202,10 @@ typedef struct DCAContext {
 
     /* Subband samples history (for ADPCM) */
     DECLARE_ALIGNED(16, float, subband_samples_hist)[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4];
-    DECLARE_ALIGNED(32, float, subband_fir_hist)[DCA_PRIM_CHANNELS_MAX][512];
-    DECLARE_ALIGNED(32, float, subband_fir_noidea)[DCA_PRIM_CHANNELS_MAX][32];
+    /* Half size is sufficient for core decoding, but for 96 kHz data
+     * we need QMF with 64 subbands and 1024 samples. */
+    DECLARE_ALIGNED(32, float, subband_fir_hist)[DCA_PRIM_CHANNELS_MAX][1024];
+    DECLARE_ALIGNED(32, float, subband_fir_noidea)[DCA_PRIM_CHANNELS_MAX][64];
     int hist_index[DCA_PRIM_CHANNELS_MAX];
     DECLARE_ALIGNED(32, float, raXin)[32];
 
@@ -155,12 +227,31 @@ typedef struct DCAContext {
     int current_subsubframe;
 
     int core_ext_mask;          ///< present extensions in the core substream
+    int exss_ext_mask;          ///< Non-core extensions
 
     /* XCh extension information */
     int xch_present;            ///< XCh extension present and valid
     int xch_base_channel;       ///< index of first (only) channel containing XCH data
     int xch_disable;            ///< whether the XCh extension should be decoded or not
 
+    /* XLL extension information */
+    int xll_disable;
+    int xll_nch_sets;           ///< number of channel sets per frame
+    int xll_channels;           ///< total number of channels (in all channel sets)
+    int xll_residual_channels;  ///< number of residual channels
+    int xll_segments;           ///< number of segments per frame
+    int xll_log_smpl_in_seg;    ///< supposedly this is "nBits4SamplLoci"
+    int xll_smpl_in_seg;        ///< samples in segment per one frequency band for the first channel set
+    int xll_bits4seg_size;      ///< number of bits used to read segment size
+    int xll_banddata_crc;       ///< presence of CRC16 within each frequency band
+    int xll_scalable_lsb;
+    int xll_bits4ch_mask;       ///< channel position mask
+    int xll_fixed_lsb_width;
+    XllChSetSubHeader xll_chsets[DCA_XLL_CHSETS_MAX];
+    XllNavi xll_navi;
+    int *xll_sample_buf;
+    unsigned int xll_sample_buf_size;
+
     /* ExSS header parser */
     int static_fields;          ///< static fields present
     int mix_metadata;           ///< mixing metadata present
@@ -168,12 +259,14 @@ typedef struct DCAContext {
     int mix_config_num_ch[4];   ///< number of channels in each mix out configuration
 
     int profile;
+    int one2one_map_chtospkr;
 
     int debug_flag;             ///< used for suppressing repeated error messages output
     AVFloatDSPContext fdsp;
     FFTContext imdct;
     SynthFilterContext synth;
     DCADSPContext dcadsp;
+    QMF64_table *qmf64_table;
     FmtConvertContext fmt_conv;
 } DCAContext;
 
@@ -187,4 +280,8 @@ int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
 
 void ff_dca_exss_parse_header(DCAContext *s);
 
+int ff_dca_xll_decode_header(DCAContext *s);
+int ff_dca_xll_decode_navi(DCAContext *s, int asset_end);
+int ff_dca_xll_decode_audio(DCAContext *s, AVFrame *frame);
+
 #endif /* AVCODEC_DCA_H */