AMR algebraic code book (fixed) vector decoding functions

Functions
static void	decode_10bit_pulse (int code, int pulse_position[8], int i1, int i2, int i3)
	Decode a 10-bit algebraic codebook index from a 10.2 kbit/s frame.
static void	decode_8_pulses_31bits (const int16_t *fixed_index, AMRFixed *fixed_sparse)
	Decode the algebraic codebook index to pulse positions and signs and construct the algebraic codebook vector for MODE_10k2.
static void	decode_fixed_sparse (AMRFixed *fixed_sparse, const uint16_t *pulses, const enum Mode mode, const int subframe)
	Decode the algebraic codebook index to pulse positions and signs, then construct the algebraic codebook vector.
static void	pitch_sharpening (AMRContext *p, int subframe, enum Mode mode, AMRFixed *fixed_sparse)
	Apply pitch lag to obtain the sharpened fixed vector (section 6.1.2).

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Function Documentation

static void decode_10bit_pulse	(	int	code,
		int	pulse_position[8],
		int	i1,
		int	i2,
		int	i3
	)			[static]

Decode a 10-bit algebraic codebook index from a 10.2 kbit/s frame.

Definition at line 440 of file amrnbdec.c.

Referenced by decode_8_pulses_31bits().

static void decode_8_pulses_31bits	(	const int16_t *	fixed_index,
		AMRFixed *	fixed_sparse
	)			[static]

Decode the algebraic codebook index to pulse positions and signs and construct the algebraic codebook vector for MODE_10k2.

Parameters:

	fixed_index	positions of the eight pulses
	fixed_sparse	pointer to the algebraic codebook vector

Definition at line 458 of file amrnbdec.c.

Referenced by decode_fixed_sparse().

static void decode_fixed_sparse	(	AMRFixed *	fixed_sparse,
		const uint16_t *	pulses,
		const enum Mode	mode,
		const int	subframe
	)			[static]

Decode the algebraic codebook index to pulse positions and signs, then construct the algebraic codebook vector.

nb of pulses | bits encoding pulses For MODE_4k75 or MODE_5k15, 2 | 1-3, 4-6, 7 MODE_5k9, 2 | 1, 2-4, 5-6, 7-9 MODE_6k7, 3 | 1-3, 4, 5-7, 8, 9-11 MODE_7k4 or MODE_7k95, 4 | 1-3, 4-6, 7-9, 10, 11-13

Parameters:

	fixed_sparse	pointer to the algebraic codebook vector
	pulses	algebraic codebook indexes
	mode	mode of the current frame
	subframe	current subframe number

Definition at line 504 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), and decode_frame().

static void pitch_sharpening	(	AMRContext *	p,
		int	subframe,
		enum Mode	mode,
		AMRFixed *	fixed_sparse
	)			[static]

Apply pitch lag to obtain the sharpened fixed vector (section 6.1.2).

Parameters:

	p	the context
	subframe	unpacked amr subframe
	mode	mode of the current frame
	fixed_sparse	sparse respresentation of the fixed vector

Definition at line 557 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), and eval_ir().