mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-12-05 01:56:41 +00:00
2912e87a6c
Signed-off-by: Mans Rullgard <mans@mansr.com>
130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/*
|
|
* audio encoder psychoacoustic model
|
|
* Copyright (C) 2008 Konstantin Shishkov
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "psymodel.h"
|
|
#include "iirfilter.h"
|
|
|
|
extern const FFPsyModel ff_aac_psy_model;
|
|
|
|
av_cold int ff_psy_init(FFPsyContext *ctx, AVCodecContext *avctx,
|
|
int num_lens,
|
|
const uint8_t **bands, const int* num_bands)
|
|
{
|
|
ctx->avctx = avctx;
|
|
ctx->psy_bands = av_mallocz(sizeof(FFPsyBand) * PSY_MAX_BANDS * avctx->channels);
|
|
ctx->bands = av_malloc (sizeof(ctx->bands[0]) * num_lens);
|
|
ctx->num_bands = av_malloc (sizeof(ctx->num_bands[0]) * num_lens);
|
|
memcpy(ctx->bands, bands, sizeof(ctx->bands[0]) * num_lens);
|
|
memcpy(ctx->num_bands, num_bands, sizeof(ctx->num_bands[0]) * num_lens);
|
|
switch (ctx->avctx->codec_id) {
|
|
case CODEC_ID_AAC:
|
|
ctx->model = &ff_aac_psy_model;
|
|
break;
|
|
}
|
|
if (ctx->model->init)
|
|
return ctx->model->init(ctx);
|
|
return 0;
|
|
}
|
|
|
|
FFPsyWindowInfo ff_psy_suggest_window(FFPsyContext *ctx,
|
|
const int16_t *audio, const int16_t *la,
|
|
int channel, int prev_type)
|
|
{
|
|
return ctx->model->window(ctx, audio, la, channel, prev_type);
|
|
}
|
|
|
|
void ff_psy_set_band_info(FFPsyContext *ctx, int channel,
|
|
const float *coeffs, const FFPsyWindowInfo *wi)
|
|
{
|
|
ctx->model->analyze(ctx, channel, coeffs, wi);
|
|
}
|
|
|
|
av_cold void ff_psy_end(FFPsyContext *ctx)
|
|
{
|
|
if (ctx->model->end)
|
|
ctx->model->end(ctx);
|
|
av_freep(&ctx->bands);
|
|
av_freep(&ctx->num_bands);
|
|
av_freep(&ctx->psy_bands);
|
|
}
|
|
|
|
typedef struct FFPsyPreprocessContext{
|
|
AVCodecContext *avctx;
|
|
float stereo_att;
|
|
struct FFIIRFilterCoeffs *fcoeffs;
|
|
struct FFIIRFilterState **fstate;
|
|
}FFPsyPreprocessContext;
|
|
|
|
#define FILT_ORDER 4
|
|
|
|
av_cold struct FFPsyPreprocessContext* ff_psy_preprocess_init(AVCodecContext *avctx)
|
|
{
|
|
FFPsyPreprocessContext *ctx;
|
|
int i;
|
|
float cutoff_coeff = 0;
|
|
ctx = av_mallocz(sizeof(FFPsyPreprocessContext));
|
|
ctx->avctx = avctx;
|
|
|
|
if (avctx->cutoff > 0)
|
|
cutoff_coeff = 2.0 * avctx->cutoff / avctx->sample_rate;
|
|
|
|
if (cutoff_coeff)
|
|
ctx->fcoeffs = ff_iir_filter_init_coeffs(avctx, FF_FILTER_TYPE_BUTTERWORTH,
|
|
FF_FILTER_MODE_LOWPASS, FILT_ORDER,
|
|
cutoff_coeff, 0.0, 0.0);
|
|
if (ctx->fcoeffs) {
|
|
ctx->fstate = av_mallocz(sizeof(ctx->fstate[0]) * avctx->channels);
|
|
for (i = 0; i < avctx->channels; i++)
|
|
ctx->fstate[i] = ff_iir_filter_init_state(FILT_ORDER);
|
|
}
|
|
return ctx;
|
|
}
|
|
|
|
void ff_psy_preprocess(struct FFPsyPreprocessContext *ctx,
|
|
const int16_t *audio, int16_t *dest,
|
|
int tag, int channels)
|
|
{
|
|
int ch, i;
|
|
if (ctx->fstate) {
|
|
for (ch = 0; ch < channels; ch++)
|
|
ff_iir_filter(ctx->fcoeffs, ctx->fstate[tag+ch], ctx->avctx->frame_size,
|
|
audio + ch, ctx->avctx->channels,
|
|
dest + ch, ctx->avctx->channels);
|
|
} else {
|
|
for (ch = 0; ch < channels; ch++)
|
|
for (i = 0; i < ctx->avctx->frame_size; i++)
|
|
dest[i*ctx->avctx->channels + ch] = audio[i*ctx->avctx->channels + ch];
|
|
}
|
|
}
|
|
|
|
av_cold void ff_psy_preprocess_end(struct FFPsyPreprocessContext *ctx)
|
|
{
|
|
int i;
|
|
ff_iir_filter_free_coeffs(ctx->fcoeffs);
|
|
if (ctx->fstate)
|
|
for (i = 0; i < ctx->avctx->channels; i++)
|
|
ff_iir_filter_free_state(ctx->fstate[i]);
|
|
av_freep(&ctx->fstate);
|
|
av_free(ctx);
|
|
}
|
|
|