dss_sp.c File Reference

#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	DssSpSubframe
struct	DssSpFrame
struct	DssSpContext

Macros
#define	SUBFRAMES   4
#define	PULSE_MAX   8
#define	DSS_SP_FRAME_SIZE   42
#define	DSS_SP_SAMPLE_COUNT   (66 * SUBFRAMES)
#define	DSS_SP_FORMULA(a, b, c)   ((int)((((a) * (1 << 15)) + (b) * (unsigned)(c)) + 0x4000) >> 15)

Functions
static av_cold int	dss_sp_decode_init (AVCodecContext *avctx)
static void	dss_sp_unpack_coeffs (DssSpContext *p, const uint8_t *src)
static void	dss_sp_unpack_filter (DssSpContext *p)
static void	dss_sp_convert_coeffs (int32_t *lpc_filter, int32_t *coeffs)
static void	dss_sp_add_pulses (int32_t *vector_buf, const struct DssSpSubframe *sf)
static void	dss_sp_gen_exc (int32_t *vector, int32_t *prev_exc, int pitch_lag, int gain)
static void	dss_sp_scale_vector (int32_t *vec, int bits, int size)
static void	dss_sp_update_buf (int32_t *hist, int32_t *vector)
static void	dss_sp_shift_sq_sub (const int32_t *filter_buf, int32_t *error_buf, int32_t *dst)
static void	dss_sp_shift_sq_add (const int32_t *filter_buf, int32_t *audio_buf, int32_t *dst)
static void	dss_sp_vec_mult (const int32_t *src, int32_t *dst, const int16_t *mult)
static int	dss_sp_get_normalize_bits (int32_t *vector_buf, int16_t size)
static int	dss_sp_vector_sum (DssSpContext *p, int size)
static void	dss_sp_sf_synthesis (DssSpContext *p, int32_t lpc_filter, int32_t *dst, int size)
static void	dss_sp_update_state (DssSpContext *p, int32_t *dst)
static void	dss_sp_32to16bit (int16_t *dst, int32_t *src, int size)
static int	dss_sp_decode_one_frame (DssSpContext *p, int16_t *abuf_dst, const uint8_t *abuf_src)
static int	dss_sp_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)

Variables
static const uint32_t	dss_sp_combinatorial_table [PULSE_MAX][72]
static const int16_t	dss_sp_filter_cb [14][32]
static const uint16_t	dss_sp_fixed_cb_gain [64]
static const int16_t	dss_sp_pulse_val [8]
static const uint16_t	binary_decreasing_array []
static const uint16_t	dss_sp_unc_decreasing_array []
static const uint16_t	dss_sp_adaptive_gain []
static const int32_t	dss_sp_sinc [67]
AVCodec	ff_dss_sp_decoder

Macro Definition Documentation

SUBFRAMES

#define SUBFRAMES   4

Definition at line 31 of file dss_sp.c.

PULSE_MAX

#define PULSE_MAX   8

Definition at line 32 of file dss_sp.c.

DSS_SP_FRAME_SIZE

#define DSS_SP_FRAME_SIZE   42

Definition at line 34 of file dss_sp.c.

DSS_SP_SAMPLE_COUNT

#define DSS_SP_SAMPLE_COUNT   (66 * SUBFRAMES)

Definition at line 35 of file dss_sp.c.

DSS_SP_FORMULA

#define DSS_SP_FORMULA	(		a,
			b,
			c
	)		((int)((((a) * (1 << 15)) + (b) * (unsigned)(c)) + 0x4000) >> 15)

Definition at line 36 of file dss_sp.c.

Function Documentation

dss_sp_decode_init()

static av_cold int dss_sp_decode_init ( AVCodecContext *  avctx )

static

Definition at line 290 of file dss_sp.c.

dss_sp_unpack_coeffs()

static void dss_sp_unpack_coeffs ( DssSpContext *  p, const uint8_t *  src  )

static

Definition at line 305 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_unpack_filter()

static void dss_sp_unpack_filter ( DssSpContext *  p )

static

Definition at line 429 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_convert_coeffs()

static void dss_sp_convert_coeffs ( int32_t *  lpc_filter, int32_t *  coeffs  )

static

Definition at line 437 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_add_pulses()

static void dss_sp_add_pulses ( int32_t *  vector_buf, const struct DssSpSubframe *  sf  )

static

Definition at line 462 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_gen_exc()

static void dss_sp_gen_exc ( int32_t *  vector, int32_t *  prev_exc, int  pitch_lag, int  gain  )

static

Definition at line 473 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_scale_vector()

static void dss_sp_scale_vector ( int32_t *  vec, int  bits, int  size  )

static

Definition at line 493 of file dss_sp.c.

Referenced by dss_sp_sf_synthesis().

dss_sp_update_buf()

static void dss_sp_update_buf ( int32_t *  hist, int32_t *  vector  )

static

Definition at line 505 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_shift_sq_sub()

static void dss_sp_shift_sq_sub ( const int32_t *  filter_buf, int32_t *  error_buf, int32_t *  dst  )

static

Definition at line 516 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame(), and dss_sp_sf_synthesis().

dss_sp_shift_sq_add()

static void dss_sp_shift_sq_add ( const int32_t *  filter_buf, int32_t *  audio_buf, int32_t *  dst  )

static

Definition at line 540 of file dss_sp.c.

Referenced by dss_sp_sf_synthesis().

dss_sp_vec_mult()

static void dss_sp_vec_mult ( const int32_t *  src, int32_t *  dst, const int16_t *  mult  )

static

Definition at line 562 of file dss_sp.c.

Referenced by dss_sp_sf_synthesis().

dss_sp_get_normalize_bits()

static int dss_sp_get_normalize_bits ( int32_t *  vector_buf, int16_t  size  )

static

Definition at line 573 of file dss_sp.c.

Referenced by dss_sp_sf_synthesis().

dss_sp_vector_sum()

static int dss_sp_vector_sum ( DssSpContext *  p, int  size  )

static

Definition at line 588 of file dss_sp.c.

Referenced by dss_sp_sf_synthesis().

dss_sp_sf_synthesis()

static void dss_sp_sf_synthesis ( DssSpContext *  p, int32_t  lpc_filter, int32_t *  dst, int  size  )

static

Definition at line 596 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_update_state()

static void dss_sp_update_state ( DssSpContext *  p, int32_t *  dst  )

static

Definition at line 669 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_32to16bit()

static void dss_sp_32to16bit ( int16_t *  dst, int32_t *  src, int  size  )

static

Definition at line 698 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_decode_one_frame()

static int dss_sp_decode_one_frame ( DssSpContext *  p, int16_t *  abuf_dst, const uint8_t *  abuf_src  )

static

Definition at line 706 of file dss_sp.c.

Referenced by dss_sp_decode_frame().

dss_sp_decode_frame()

static int dss_sp_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame_ptr, AVPacket *  avpkt  )

static

Definition at line 743 of file dss_sp.c.

Variable Documentation

dss_sp_combinatorial_table

const uint32_t dss_sp_combinatorial_table[PULSE_MAX][72]

static

Definition at line 75 of file dss_sp.c.

Referenced by dss_sp_unpack_coeffs().

dss_sp_filter_cb

const int16_t dss_sp_filter_cb[14][32]

static

Definition at line 174 of file dss_sp.c.

Referenced by dss_sp_unpack_filter().

dss_sp_fixed_cb_gain

const uint16_t dss_sp_fixed_cb_gain[64]

static

Initial value:

= {
       0,    4,    8,   13,   17,   22,   26,   31,
      35,   40,   44,   48,   53,   58,   63,   69,
      76,   83,   91,   99,  109,  119,  130,  142,
     155,  170,  185,  203,  222,  242,  265,  290,
     317,  346,  378,  414,  452,  494,  540,  591,
     646,  706,  771,  843,  922, 1007, 1101, 1204,
    1316, 1438, 1572, 1719, 1879, 2053, 2244, 2453,
    2682, 2931, 3204, 3502, 3828, 4184, 4574, 5000,
}

Definition at line 246 of file dss_sp.c.

Referenced by dss_sp_add_pulses().

dss_sp_pulse_val

const int16_t dss_sp_pulse_val[8]

static

Initial value:

= {
    -31182, -22273, -13364, -4455, 4455, 13364, 22273, 31182
}

Definition at line 257 of file dss_sp.c.

Referenced by dss_sp_add_pulses().

binary_decreasing_array

const uint16_t binary_decreasing_array[]

static

Initial value:

= {
    32767, 16384, 8192, 4096, 2048, 1024, 512, 256,
    128, 64, 32, 16, 8, 4, 2,
}

Definition at line 261 of file dss_sp.c.

Referenced by dss_sp_sf_synthesis().

dss_sp_unc_decreasing_array

const uint16_t dss_sp_unc_decreasing_array[]

static

Initial value:

= {
    32767, 26214, 20972, 16777, 13422, 10737, 8590, 6872,
    5498, 4398, 3518, 2815, 2252, 1801, 1441,
}

Definition at line 266 of file dss_sp.c.

Referenced by dss_sp_sf_synthesis().

dss_sp_adaptive_gain

const uint16_t dss_sp_adaptive_gain[]

static

Initial value:

= {
     102,  231,  360,  488,  617,  746,  875, 1004,
    1133, 1261, 1390, 1519, 1648, 1777, 1905, 2034,
    2163, 2292, 2421, 2550, 2678, 2807, 2936, 3065,
    3194, 3323, 3451, 3580, 3709, 3838, 3967, 4096,
}

Definition at line 271 of file dss_sp.c.

Referenced by dss_sp_decode_one_frame().

dss_sp_sinc

const int32_t dss_sp_sinc[67]

static

Initial value:

= {
      262,   293,   323,   348,   356,   336,   269,   139,
      -67,  -358,  -733, -1178, -1668, -2162, -2607, -2940,
    -3090, -2986, -2562, -1760,  -541,  1110,  3187,  5651,
     8435, 11446, 14568, 17670, 20611, 23251, 25460, 27125,
    28160, 28512, 28160,
    27125, 25460, 23251, 20611, 17670, 14568, 11446,  8435,
     5651,  3187,  1110,  -541, -1760, -2562, -2986, -3090,
    -2940, -2607, -2162, -1668, -1178,  -733,  -358,   -67,
      139,   269,   336,   356,   348,   323,   293,   262,
}

Definition at line 278 of file dss_sp.c.

Referenced by dss_sp_update_state().

ff_dss_sp_decoder

AVCodec ff_dss_sp_decoder

Initial value:

= {
    .name           = "dss_sp",
    .long_name      = NULL_IF_CONFIG_SMALL("Digital Speech Standard - Standard Play mode (DSS SP)"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_DSS_SP,
    .priv_data_size = sizeof(DssSpContext),
    .init           = dss_sp_decode_init,
    .decode         = dss_sp_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
}

Definition at line 776 of file dss_sp.c.