hvirtual/quicktime/ffmpeg/libavcodec/g726.c File Reference

#include <limits.h>
#include "avcodec.h"
#include "common.h"
#include "bitstream.h"

Include dependency graph for g726.c:

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Data Structures

struct Float11

struct G726Tables

struct G726Context

struct AVG726Context

Functions

static Float11 * i2f (int16_t i, Float11 *f)

static int16_t mult (Float11 *f1, Float11 *f2)

static int sgn (int value)

static uint8_t quant (G726Context *c, int d)

static int16_t inverse_quant (G726Context *c, int i)

static int16_t g726_iterate (G726Context *c, int16_t I)

static int g726_reset (G726Context *c, int bit_rate)

static int16_t g726_decode (G726Context *c, int16_t i)

static int16_t g726_encode (G726Context *c, int16_t sig)

static int g726_init (AVCodecContext *avctx)

static int g726_close (AVCodecContext *avctx)

static int g726_encode_frame (AVCodecContext *avctx, uint8_t *dst, int buf_size, void *data)

static int g726_decode_frame (AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)

Variables

static int quant_tbl16 []

static int iquant_tbl16 []

static int W_tbl16 []

static int F_tbl16 []

static int quant_tbl24 []

static int iquant_tbl24 []

static int W_tbl24 []

static int F_tbl24 []

static int quant_tbl32 []

static int iquant_tbl32 []

static int W_tbl32 []

static int F_tbl32 []

static int quant_tbl40 []

static int iquant_tbl40 []

static int W_tbl40 []

static int F_tbl40 []

static G726Tables G726Tables_pool []

AVCodec adpcm_g726_decoder

Function Documentation

static int g726_close ( AVCodecContext * avctx ) [static]

Definition at line 347 of file g726.c.

References av_freep(), and AVCodecContext::coded_frame.

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static int16_t g726_decode	(	G726Context *	c,
		int16_t	i
	)			`[static]`

Definition at line 297 of file g726.c.

References g726_iterate().

Referenced by g726_decode_frame().

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static int g726_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		uint8_t *	buf,
		int	buf_size
	)			`[static]`

Definition at line 370 of file g726.c.

References AVG726Context::bit_buffer, AVG726Context::bits_left, AVG726Context::c, c, AVG726Context::code_size, g726_decode(), get_bits(), get_bits_count(), init_get_bits(), AVCodecContext::priv_data, s, and samples.

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static int16_t g726_encode	(	G726Context *	c,
		int16_t	sig
	)			`[static]`

Definition at line 302 of file g726.c.

References G726Tables::bits, g726_iterate(), quant(), G726Context::se, and G726Context::tbls.

Referenced by g726_encode_frame().

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static int g726_encode_frame	(	AVCodecContext *	avctx,
		uint8_t *	dst,
		int	buf_size,
		void *	data
	)			`[static]`

Definition at line 353 of file g726.c.

References AVG726Context::c, c, AVG726Context::code_size, flush_put_bits(), g726_encode(), init_put_bits(), AVCodecContext::priv_data, put_bits(), put_bits_count(), and samples.

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static int g726_init ( AVCodecContext * avctx ) [static]

Definition at line 320 of file g726.c.

References av_log(), AV_LOG_ERROR, avcodec_alloc_frame(), AVG726Context::bit_buffer, AVCodecContext::bit_rate, G726Tables::bits, AVG726Context::bits_left, AVG726Context::c, c, AVCodecContext::channels, AVG726Context::code_size, AVCodecContext::coded_frame, ENOMEM, FF_COMPLIANCE_INOFFICIAL, g726_reset(), AVCodecContext::priv_data, AVCodecContext::sample_rate, AVCodecContext::strict_std_compliance, and G726Context::tbls.

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static int16_t g726_iterate	(	G726Context *	c,
		int16_t	I
	)			`[inline, static]`

Definition at line 186 of file g726.c.

References G726Context::a, G726Context::ap, G726Context::b, G726Tables::bits, G726Context::dml, G726Context::dms, G726Context::dq, G726Tables::F, i2f(), inverse_quant(), mult(), G726Context::pk, G726Context::se, G726Context::sez, sgn(), Float11::sign, G726Context::sr, G726Context::tbls, G726Context::td, G726Tables::W, G726Context::y, G726Context::yl, and G726Context::yu.

Referenced by g726_decode(), and g726_encode().

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static int g726_reset	(	G726Context *	c,
		int	bit_rate
	)			`[static]`

Definition at line 269 of file g726.c.

References G726Context::a, G726Context::ap, G726Context::b, G726Context::dml, G726Context::dms, G726Context::dq, i2f(), G726Context::pk, G726Context::se, G726Context::sez, G726Context::sr, G726Context::tbls, G726Context::td, G726Context::y, G726Context::yl, and G726Context::yu.

Referenced by g726_init().

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static Float11* i2f	(	int16_t	i,
		Float11 *	f
	)			`[inline, static]`

Definition at line 39 of file g726.c.

References Float11::exp, Float11::mant, and Float11::sign.

Referenced by g726_iterate(), and g726_reset().

static int16_t inverse_quant	(	G726Context *	c,
		int	i
	)			`[inline, static]`

Para 4.2.3 page 22: Inverse adaptive quantizer.

Definition at line 176 of file g726.c.

References G726Tables::iquant, G726Context::tbls, and G726Context::y.

Referenced by g726_iterate().

static int16_t mult	(	Float11 *	f1,
		Float11 *	f2
	)			`[inline, static]`

Definition at line 50 of file g726.c.

References Float11::exp, Float11::mant, and Float11::sign.

Referenced by encode_frame(), g726_iterate(), and wma_decode_block().

static uint8_t quant	(	G726Context *	c,
		int	d
	)			`[inline, static]`

Para 4.2.2 page 18: Adaptive quantizer.

Definition at line 150 of file g726.c.

References G726Tables::bits, G726Tables::quant, G726Context::tbls, and G726Context::y.

Referenced by a52_block(), dv_decode_video_segment(), g726_encode(), and RateCtlGetQ().

static int sgn ( int value ) [inline, static]

Definition at line 60 of file g726.c.

Referenced by g726_iterate().

Variable Documentation

AVCodec adpcm_g726_decoder

Initial value:

 {
    "g726",
    CODEC_TYPE_AUDIO,
    CODEC_ID_ADPCM_G726,
    sizeof(AVG726Context),
    g726_init,
    NULL,
    g726_close,
    g726_decode_frame,
}

Definition at line 415 of file g726.c.

int F_tbl16[] [static]

Initial value:

           { 0, 7, 7, 0 }

Definition at line 100 of file g726.c.

int F_tbl24[] [static]

Initial value:

           { 0, 1, 2, 7, 7, 2, 1, 0 }

Definition at line 109 of file g726.c.

int F_tbl32[] [static]

Initial value:

 
           { 0, 0, 0, 1, 1, 1, 3, 7, 7, 3, 1, 1, 1, 0, 0, 0 }

Definition at line 120 of file g726.c.

int F_tbl40[] [static]

Initial value:

 
           { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 3, 4, 5, 6, 6,
             6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }

Definition at line 136 of file g726.c.

G726Tables G726Tables_pool[] [static]

Initial value:

 
           {{ 2, quant_tbl16, iquant_tbl16, W_tbl16, F_tbl16 },
            { 3, quant_tbl24, iquant_tbl24, W_tbl24, F_tbl24 },
            { 4, quant_tbl32, iquant_tbl32, W_tbl32, F_tbl32 },
            { 5, quant_tbl40, iquant_tbl40, W_tbl40, F_tbl40 }}

Definition at line 140 of file g726.c.

int iquant_tbl16[] [static]

Initial value:

           { 116, 365, 365, 116 }

Definition at line 96 of file g726.c.

int iquant_tbl24[] [static]

Initial value:

           { INT_MIN, 135, 273, 373, 373, 273, 135, INT_MIN }

Definition at line 105 of file g726.c.

int iquant_tbl32[] [static]

Initial value:

           { INT_MIN,   4, 135, 213, 273, 323, 373, 425,  
                 425, 373, 323, 273, 213, 135,   4, INT_MIN }

Definition at line 114 of file g726.c.

int iquant_tbl40[] [static]

Initial value:

           { INT_MIN, -66,  28, 104, 169, 224, 274, 318,  
                 358, 395, 429, 459, 488, 514, 539, 566,
                 566, 539, 514, 488, 459, 429, 395, 358,
                 318, 274, 224, 169, 104,  28, -66, INT_MIN }

Definition at line 126 of file g726.c.

int quant_tbl16[] [static]

Initial value:

           { 260, INT_MAX }

16kbit/s 2bits per sample

Definition at line 94 of file g726.c.

int quant_tbl24[] [static]

Initial value:

           {  7, 217, 330, INT_MAX }

24kbit/s 3bits per sample

Definition at line 103 of file g726.c.

int quant_tbl32[] [static]

Initial value:

           { -125,  79, 177, 245, 299, 348, 399, INT_MAX }

32kbit/s 4bits per sample

Definition at line 112 of file g726.c.

int quant_tbl40[] [static]

Initial value:

           { -122, -16,  67, 138, 197, 249, 297, 338,
              377, 412, 444, 474, 501, 527, 552, INT_MAX }

40kbit/s 5bits per sample

Definition at line 123 of file g726.c.

int W_tbl16[] [static]

Initial value:

 
           { -22, 439, 439, -22 }

Definition at line 98 of file g726.c.

int W_tbl24[] [static]

Initial value:

 
           { -4,  30, 137, 582, 582, 137,  30, -4 }

Definition at line 107 of file g726.c.

int W_tbl32[] [static]

Initial value:

 
           { -12,  18,  41,  64, 112, 198, 355, 1122,
            1122, 355, 198, 112,  64,  41,  18, -12}

Definition at line 117 of file g726.c.

int W_tbl40[] [static]

Initial value:

 
           {   14,  14,  24,  39,  40,  41,   58,  100,
              141, 179, 219, 280, 358, 440,  529,  696, 
              696, 529, 440, 358, 280, 219,  179,  141,
              100,  58,  41,  40,  39,  24,   14,   14 }

Definition at line 131 of file g726.c.

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