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/*
* Nellymoser encoder
* This code is developed as part of Google Summer of Code 2008 Program.
*
* Copyright (c) 2008 Bartlomiej Wolowiec
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file nellymoserenc.c
* Nellymoser encoder
* by Bartlomiej Wolowiec
*
* Generic codec information: libavcodec/nellymoserdec.c
*
* Some information also from: http://www1.mplayerhq.hu/ASAO/ASAO.zip
* (Copyright Joseph Artsimovich and UAB "DKD")
*
* for more information about nellymoser format, visit:
* http://wiki.multimedia.cx/index.php?title=Nellymoser
*/
#include "nellymoser.h"
#include "avcodec.h"
#include "dsputil.h"
#define BITSTREAM_WRITER_LE
#include "bitstream.h"
#define POW_TABLE_SIZE (1<<11)
#define POW_TABLE_OFFSET 3
typedef struct NellyMoserEncodeContext {
AVCodecContext *avctx;
int last_frame;
DSPContext dsp;
MDCTContext mdct_ctx;
} NellyMoserEncodeContext;
static float pow_table[POW_TABLE_SIZE]; ///< -pow(2, -i / 2048.0 - 3.0);
static const uint8_t sf_lut[96] = {
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,
};
static const uint8_t sf_delta_lut[78] = {
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,
};
static const uint8_t quant_lut[230] = {
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,
};
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 };
static av_cold int encode_init(AVCodecContext *avctx)
{
NellyMoserEncodeContext *s = avctx->priv_data;
int i;
if (avctx->channels != 1) {
av_log(avctx, AV_LOG_ERROR, "Nellymoser supports only 1 channel\n");
return -1;
}
if (avctx->sample_rate != 8000 && avctx->sample_rate != 11025 &&
avctx->sample_rate != 22050 && avctx->sample_rate != 44100 &&
avctx->strict_std_compliance >= FF_COMPLIANCE_NORMAL) {
av_log(avctx, AV_LOG_ERROR, "Nellymoser works only with 8000, 11025, 22050 and 44100 sample rate\n");
return -1;
}
avctx->frame_size = NELLY_SAMPLES;
s->avctx = avctx;
ff_mdct_init(&s->mdct_ctx, 8, 0);
dsputil_init(&s->dsp, avctx);
/* Generate overlap window */
ff_sine_window_init(ff_sine_128, 128);
for (i = 0; i < POW_TABLE_SIZE; i++)
pow_table[i] = -pow(2, -i / 2048.0 - 3.0 + POW_TABLE_OFFSET);
return 0;
}
static av_cold int encode_end(AVCodecContext *avctx)
{
NellyMoserEncodeContext *s = avctx->priv_data;
ff_mdct_end(&s->mdct_ctx);
return 0;
}
#define find_best(val, table, LUT, LUT_add, LUT_size) \
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++;
AVCodec nellymoser_encoder = {
.name = "nellymoser",
.type = CODEC_TYPE_AUDIO,
.id = CODEC_ID_NELLYMOSER,
.priv_data_size = sizeof(NellyMoserEncodeContext),
.init = encode_init,
.encode = encode_frame,
.close = encode_end,
.capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
.long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao Codec"),
};
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