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f0e1a315a1
The iirfilter is only used in its test tool since
01ecb7172b which
stopped using it in AAC, its only user.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/*
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* audio encoder psychoacoustic model
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* Copyright (C) 2008 Konstantin Shishkov
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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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#include "avcodec.h"
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#include "psymodel.h"
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#include "libavutil/mem.h"
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extern const FFPsyModel ff_aac_psy_model;
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av_cold int ff_psy_init(FFPsyContext *ctx, AVCodecContext *avctx, int num_lens,
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const uint8_t **bands, const int* num_bands,
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int num_groups, const uint8_t *group_map)
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{
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int i, j, k = 0;
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ctx->avctx = avctx;
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ctx->ch = av_calloc(avctx->ch_layout.nb_channels, 2 * sizeof(ctx->ch[0]));
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ctx->group = av_calloc(num_groups, sizeof(ctx->group[0]));
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ctx->bands = av_memdup(bands, num_lens * sizeof(ctx->bands[0]));
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ctx->num_bands = av_memdup(num_bands, num_lens * sizeof(ctx->num_bands[0]));
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ctx->cutoff = avctx->cutoff;
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if (!ctx->ch || !ctx->group || !ctx->bands || !ctx->num_bands) {
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ff_psy_end(ctx);
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return AVERROR(ENOMEM);
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}
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/* assign channels to groups (with virtual channels for coupling) */
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for (i = 0; i < num_groups; i++) {
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/* NOTE: Add 1 to handle the AAC chan_config without modification.
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* This has the side effect of allowing an array of 0s to map
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* to one channel per group.
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*/
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ctx->group[i].num_ch = group_map[i] + 1;
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for (j = 0; j < ctx->group[i].num_ch * 2; j++)
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ctx->group[i].ch[j] = &ctx->ch[k++];
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}
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switch (ctx->avctx->codec_id) {
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case AV_CODEC_ID_AAC:
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ctx->model = &ff_aac_psy_model;
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break;
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}
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if (ctx->model->init)
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return ctx->model->init(ctx);
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return 0;
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}
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FFPsyChannelGroup *ff_psy_find_group(FFPsyContext *ctx, int channel)
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{
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int i = 0, ch = 0;
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while (ch <= channel)
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ch += ctx->group[i++].num_ch;
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return &ctx->group[i-1];
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}
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av_cold void ff_psy_end(FFPsyContext *ctx)
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{
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if (ctx->model && ctx->model->end)
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ctx->model->end(ctx);
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av_freep(&ctx->bands);
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av_freep(&ctx->num_bands);
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av_freep(&ctx->group);
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av_freep(&ctx->ch);
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}
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