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145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/*
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* Nellymoser encoder
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* This code is developed as part of Google Summer of Code 2008 Program.
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*
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* Copyright (c) 2008 Bartlomiej Wolowiec
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file nellymoserenc.c
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* Nellymoser encoder
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* by Bartlomiej Wolowiec
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*
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* Generic codec information: libavcodec/nellymoserdec.c
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*
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* Some information also from: http://www1.mplayerhq.hu/ASAO/ASAO.zip
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* (Copyright Joseph Artsimovich and UAB "DKD")
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*
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* for more information about nellymoser format, visit:
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* http://wiki.multimedia.cx/index.php?title=Nellymoser
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*/
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#include "nellymoser.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#define BITSTREAM_WRITER_LE
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#include "bitstream.h"
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#define POW_TABLE_SIZE (1<<11)
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#define POW_TABLE_OFFSET 3
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typedef struct NellyMoserEncodeContext {
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AVCodecContext *avctx;
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int last_frame;
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} NellyMoserEncodeContext;
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static float pow_table[POW_TABLE_SIZE]; ///< -pow(2, -i / 2048.0 - 3.0);
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static const uint8_t sf_lut[96] = {
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0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4,
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5, 5, 5, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 13, 13, 14,
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15, 15, 16, 17, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 26,
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27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40,
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41, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 52, 52, 53,
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54, 55, 55, 56, 57, 57, 58, 59, 59, 60, 60, 60, 61, 61, 61, 62,
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};
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static const uint8_t sf_delta_lut[78] = {
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0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4,
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4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 9, 10, 10, 11, 11, 12,
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13, 13, 14, 15, 16, 17, 17, 18, 19, 19, 20, 21, 21, 22, 22, 23,
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23, 24, 24, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 27, 28,
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28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 30,
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};
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static const uint8_t quant_lut[230] = {
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0,
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0, 1, 2,
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0, 1, 2, 3, 4, 5, 6,
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0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11,
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12, 13, 13, 13, 14,
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0, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8,
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8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
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22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 29,
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30,
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0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3,
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4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8, 9, 9, 9,
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10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15,
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15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 20, 20, 20,
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21, 21, 22, 22, 23, 23, 24, 25, 26, 26, 27, 28, 29, 30, 31, 32,
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33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 44, 44, 45, 45,
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46, 47, 47, 48, 48, 49, 49, 50, 50, 50, 51, 51, 51, 52, 52, 52,
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53, 53, 53, 54, 54, 54, 55, 55, 55, 56, 56, 56, 57, 57, 57, 57,
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58, 58, 58, 58, 59, 59, 59, 59, 60, 60, 60, 60, 60, 61, 61, 61,
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61, 61, 61, 61, 62,
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};
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static const float quant_lut_mul[7] = { 0.0, 0.0, 2.0, 2.0, 5.0, 12.0, 36.6 };
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static const float quant_lut_add[7] = { 0.0, 0.0, 2.0, 7.0, 21.0, 56.0, 157.0 };
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static const uint8_t quant_lut_offset[8] = { 0, 0, 1, 4, 11, 32, 81, 230 };
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static av_cold int encode_init(AVCodecContext *avctx)
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{
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NellyMoserEncodeContext *s = avctx->priv_data;
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int i;
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if (avctx->channels != 1) {
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av_log(avctx, AV_LOG_ERROR, "Nellymoser supports only 1 channel\n");
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return -1;
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}
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avctx->frame_size = NELLY_SAMPLES;
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s->avctx = avctx;
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ff_mdct_init(&s->mdct_ctx, 8, 0);
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dsputil_init(&s->dsp, avctx);
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/* Generate overlap window */
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ff_sine_window_init(ff_sine_128, 128);
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for (i = 0; i < POW_TABLE_SIZE; i++)
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pow_table[i] = -pow(2, -i / 2048.0 - 3.0 + POW_TABLE_OFFSET);
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return 0;
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}
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static av_cold int encode_end(AVCodecContext *avctx)
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{
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NellyMoserEncodeContext *s = avctx->priv_data;
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ff_mdct_end(&s->mdct_ctx);
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return 0;
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}
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AVCodec nellymoser_encoder = {
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.name = "nellymoser",
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.type = CODEC_TYPE_AUDIO,
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.id = CODEC_ID_NELLYMOSER,
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.priv_data_size = sizeof(NellyMoserEncodeContext),
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.init = encode_init,
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.encode = encode_frame,
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.close = encode_end,
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.capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
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.long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao Codec"),
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};
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