nellymoserenc.c File Reference

Nellymoser encoder by Bartlomiej Wolowiec. More...

#include "libavutil/common.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mathematics.h"
#include "audio_frame_queue.h"
#include "avcodec.h"
#include "fft.h"
#include "internal.h"
#include "nellymoser.h"
#include "sinewin.h"
#include "put_bits.h"

Go to the source code of this file.

Data Structures
struct	NellyMoserEncodeContext

Macros
#define	BITSTREAM_WRITER_LE
#define	POW_TABLE_SIZE   (1<<11)
#define	POW_TABLE_OFFSET   3
#define	OPT_SIZE   ((1<<15) + 3000)
#define	find_best(val, table, LUT, LUT_add, LUT_size)

Functions
static void	apply_mdct (NellyMoserEncodeContext *s)
static av_cold int	encode_end (AVCodecContext *avctx)
static av_cold int	encode_init (AVCodecContext *avctx)
static void	get_exponent_greedy (NellyMoserEncodeContext *s, float *cand, int *idx_table)
static float	distance (float x, float y, int band)
static void	get_exponent_dynamic (NellyMoserEncodeContext *s, float *cand, int *idx_table)
static void	encode_block (NellyMoserEncodeContext *s, unsigned char *output, int output_size)
	Encode NELLY_SAMPLES samples. More...
static int	encode_frame (AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)

Variables
static float	pow_table [POW_TABLE_SIZE]
	pow(2, -i / 2048.0 - 3.0); More...
static const uint8_t	sf_lut [96]
static const uint8_t	sf_delta_lut [78]
static const uint8_t	quant_lut [230]
static const float	quant_lut_mul [7] = { 0.0, 0.0, 2.0, 2.0, 5.0, 12.0, 36.6 }
static const float	quant_lut_add [7] = { 0.0, 0.0, 2.0, 7.0, 21.0, 56.0, 157.0 }
static const uint8_t	quant_lut_offset [8] = { 0, 0, 1, 4, 11, 32, 81, 230 }
AVCodec	ff_nellymoser_encoder

Detailed Description

Nellymoser encoder by Bartlomiej Wolowiec.

Generic codec information: libavcodec/nellymoserdec.c

Some information also from: http://samples.mplayerhq.hu/A-codecs/Nelly_Moser/ASAO/ASAO.zip (Copyright Joseph Artsimovich and UAB "DKD")

for more information about nellymoser format, visit: http://wiki.multimedia.cx/index.php?title=Nellymoser

Definition in file nellymoserenc.c.

Macro Definition Documentation

#define BITSTREAM_WRITER_LE

Definition at line 49 of file nellymoserenc.c.

#define POW_TABLE_SIZE   (1<<11)

Definition at line 52 of file nellymoserenc.c.

Referenced by encode_init().

#define POW_TABLE_OFFSET   3

Definition at line 53 of file nellymoserenc.c.

Referenced by encode_block(), and encode_init().

#define OPT_SIZE   ((1<<15) + 3000)

Definition at line 54 of file nellymoserenc.c.

Referenced by encode_init(), and get_exponent_dynamic().

#define find_best	(		val,
			table,
			LUT,
			LUT_add,
			LUT_size
	)

Value:

best_idx = \
        LUT[av_clip ((lrintf(val) >> 8) + LUT_add, 0, LUT_size - 1)]; \
    if (fabs(val - table[best_idx]) > fabs(val - table[best_idx + 1])) \
        best_idx++;

Definition at line 200 of file nellymoserenc.c.

Referenced by get_exponent_greedy().

Function Documentation

static void apply_mdct ( NellyMoserEncodeContext *  s )

static

Definition at line 119 of file nellymoserenc.c.

Referenced by encode_block().

static av_cold int encode_end ( AVCodecContext *  avctx )

static

Definition at line 134 of file nellymoserenc.c.

Referenced by encode_init().

static av_cold int encode_init ( AVCodecContext *  avctx )

static

Definition at line 150 of file nellymoserenc.c.

static void get_exponent_greedy ( NellyMoserEncodeContext *  s, float *  cand, int *  idx_table  )

static

Definition at line 206 of file nellymoserenc.c.

Referenced by encode_block().

static float distance ( float  x, float  y, int  band  )

inlinestatic

Definition at line 224 of file nellymoserenc.c.

Referenced by decode_entropy_coded_image(), ff_add_index_entry(), ff_er_frame_end(), get_exponent_dynamic(), guess_dc(), mov_build_index(), mov_read_trun(), opus_rc_laplace(), put_vector(), and render_charset().

static void get_exponent_dynamic ( NellyMoserEncodeContext *  s, float *  cand, int *  idx_table  )

static

Definition at line 231 of file nellymoserenc.c.

Referenced by encode_block().

static void encode_block ( NellyMoserEncodeContext *  s, unsigned char *  output, int  output_size  )

static

Encode NELLY_SAMPLES samples.

It assumes, that samples contains 3 * NELLY_BUF_LEN values

Parameters

s	encoder context
output	output buffer
output_size	size of output buffer

Definition at line 300 of file nellymoserenc.c.

Referenced by encode_frame().

static int encode_frame ( AVCodecContext *  avctx, AVPacket *  avpkt, const AVFrame *  frame, int *  got_packet_ptr  )

static

Definition at line 374 of file nellymoserenc.c.

Variable Documentation

float pow_table[POW_TABLE_SIZE]

static

pow(2, -i / 2048.0 - 3.0);

Definition at line 69 of file nellymoserenc.c.

Referenced by encode_block(), and encode_init().

const uint8_t sf_lut[96]

static

Initial value:

= {
     0,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  3,  3,  3,  4,  4,
     5,  5,  5,  6,  7,  7,  8,  8,  9, 10, 11, 11, 12, 13, 13, 14,
    15, 15, 16, 17, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 26,
    27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40,
    41, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 52, 52, 53,
    54, 55, 55, 56, 57, 57, 58, 59, 59, 60, 60, 60, 61, 61, 61, 62,
}

Definition at line 71 of file nellymoserenc.c.

Referenced by get_exponent_greedy().

const uint8_t sf_delta_lut[78]

static

Initial value:

= {
     0,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  3,  3,  3,  4,  4,
     4,  5,  5,  5,  6,  6,  7,  7,  8,  8,  9, 10, 10, 11, 11, 12,
    13, 13, 14, 15, 16, 17, 17, 18, 19, 19, 20, 21, 21, 22, 22, 23,
    23, 24, 24, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 27, 28,
    28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 30,
}

Definition at line 80 of file nellymoserenc.c.

Referenced by get_exponent_greedy().

const uint8_t quant_lut[230]

static

Initial value:

= {
     0,

     0,  1,  2,

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

     0,  1,  1,  2,  2,  3,  3,  4,  5,  6,  7,  8,  9, 10, 11, 11,
    12, 13, 13, 13, 14,

     0,  1,  1,  2,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  8,
     8,  9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
    22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 29,
    30,

     0,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  2,  3,  3,  3,  3,
     4,  4,  4,  5,  5,  5,  6,  6,  7,  7,  7,  8,  8,  9,  9,  9,
    10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15,
    15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 20, 20, 20,
    21, 21, 22, 22, 23, 23, 24, 25, 26, 26, 27, 28, 29, 30, 31, 32,
    33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 44, 44, 45, 45,
    46, 47, 47, 48, 48, 49, 49, 50, 50, 50, 51, 51, 51, 52, 52, 52,
    53, 53, 53, 54, 54, 54, 55, 55, 55, 56, 56, 56, 57, 57, 57, 57,
    58, 58, 58, 58, 59, 59, 59, 59, 60, 60, 60, 60, 60, 61, 61, 61,
    61, 61, 61, 61, 62,
}

Definition at line 88 of file nellymoserenc.c.

Referenced by encode_block().

const float quant_lut_mul[7] = { 0.0, 0.0, 2.0, 2.0, 5.0, 12.0, 36.6 }

static

Definition at line 115 of file nellymoserenc.c.

Referenced by encode_block().

const float quant_lut_add[7] = { 0.0, 0.0, 2.0, 7.0, 21.0, 56.0, 157.0 }

static

Definition at line 116 of file nellymoserenc.c.

Referenced by encode_block().

const uint8_t quant_lut_offset[8] = { 0, 0, 1, 4, 11, 32, 81, 230 }

static

Definition at line 117 of file nellymoserenc.c.

Referenced by encode_block().

AVCodec ff_nellymoser_encoder

Initial value:

= {
    .name           = "nellymoser",
    .long_name      = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_NELLYMOSER,
    .priv_data_size = sizeof(NellyMoserEncodeContext),
    .init           = encode_init,
    .encode2        = encode_frame,
    .close          = encode_end,
    .capabilities   = AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY,
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
                                                     AV_SAMPLE_FMT_NONE },
}

Definition at line 412 of file nellymoserenc.c.