g723_1enc.c File Reference

G.723.1 compatible encoder. More...

#include <stdint.h>
#include <string.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "celp_math.h"
#include "g723_1.h"
#include "internal.h"
#include "put_bits.h"

Macros
#define	BITSTREAM_WRITER_LE
#define	get_index(num, offset, size)
	Quantize the current LSP subvector. More...

Variables
AVCodec	ff_g723_1_encoder

Detailed Description

G.723.1 compatible encoder.

Macro Definition Documentation

get_index

#define get_index	(		num,
			offset,
			size
	)

Value:

{                                                                             \
    int error, max = -1;                                                      \
    int16_t temp[4];                                                          \
    int i, j;                                                                 \
                                                                              \
    for (i = 0; i < LSP_CB_SIZE; i++) {                                       \
        for (j = 0; j < size; j++){                                           \
            temp[j] = (weight[j + (offset)] * lsp_band##num[i][j] +           \
                      (1 << 14)) >> 15;                                       \
        }                                                                     \
        error  = ff_g723_1_dot_product(lsp + (offset), temp, size) << 1;      \
        error -= ff_g723_1_dot_product(lsp_band##num[i], temp, size);         \
        if (error > max) {                                                    \
            max = error;                                                      \
            lsp_index[num] = i;                                               \
        }                                                                     \
    }                                                                         \
}

Quantize the current LSP subvector.

Parameters

num	band number
offset	offset of the current subvector in an LPC_ORDER vector
size	size of the current subvector

Variable Documentation

ff_g723_1_encoder

AVCodec ff_g723_1_encoder

Initial value:

= {
    .name           = "g723_1",
    .long_name      = NULL_IF_CONFIG_SMALL("G.723.1"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_G723_1,
    .priv_data_size = sizeof(G723_1_Context),
    .init           = g723_1_encode_init,
    .encode2        = g723_1_encode_frame,
    .sample_fmts    = (const enum AVSampleFormat[]) {
        AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE
    },
}