Nellymoser encoder by Bartlomiej Wolowiec. More...

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

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.

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);

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 47 of file nellymoserenc.c.

#define POW_TABLE_SIZE (1<<11)

Definition at line 50 of file nellymoserenc.c.

Referenced by encode_init().

#define POW_TABLE_OFFSET 3

Definition at line 51 of file nellymoserenc.c.

Referenced by encode_block(), and encode_init().

#define OPT_SIZE ((1<<15) + 3000)

Definition at line 52 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 193 of file nellymoserenc.c.

Referenced by get_exponent_greedy().

Function Documentation

static void apply_mdct ( NellyMoserEncodeContext * s )

static

Definition at line 117 of file nellymoserenc.c.

Referenced by encode_block().

static av_cold int encode_end ( AVCodecContext * avctx )

static

Definition at line 132 of file nellymoserenc.c.

Referenced by encode_init().

static av_cold int encode_init ( AVCodecContext * avctx )

static

Definition at line 147 of file nellymoserenc.c.

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

static

Definition at line 199 of file nellymoserenc.c.

Referenced by encode_block().

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

inlinestatic

Definition at line 217 of file nellymoserenc.c.

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

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

static

Definition at line 224 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 293 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 367 of file nellymoserenc.c.

Variable Documentation

float pow_table[POW_TABLE_SIZE]

static

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

Definition at line 67 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 69 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 78 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 86 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 113 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 114 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 115 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   = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
                                                     AV_SAMPLE_FMT_NONE },
}

Definition at line 405 of file nellymoserenc.c.

Data Structures

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

Function Documentation

Variable Documentation