mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
1265 lines
43 KiB
C
1265 lines
43 KiB
C
/*
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* Copyright (c) 2017 Paul B Mahol
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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 "libavutil/audio_fifo.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "libavcodec/avfft.h"
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#include "avfilter.h"
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#include "audio.h"
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#include "formats.h"
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typedef struct AudioSurroundContext {
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const AVClass *class;
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char *out_channel_layout_str;
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char *in_channel_layout_str;
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float level_in;
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float level_out;
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float fc_in;
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float fc_out;
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float lfe_in;
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float lfe_out;
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float *input_levels;
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float *output_levels;
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int output_lfe;
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int lowcutf;
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int highcutf;
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float lowcut;
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float highcut;
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uint64_t out_channel_layout;
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uint64_t in_channel_layout;
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int nb_in_channels;
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int nb_out_channels;
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AVFrame *input;
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AVFrame *output;
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AVFrame *overlap_buffer;
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int buf_size;
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int hop_size;
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AVAudioFifo *fifo;
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RDFTContext **rdft, **irdft;
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float *window_func_lut;
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int64_t pts;
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void (*filter)(AVFilterContext *ctx);
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void (*upmix_stereo)(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float x, float y,
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int n);
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void (*upmix_2_1)(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float lfe_im,
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float lfe_re,
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float x, float y,
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int n);
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void (*upmix_3_0)(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_mag,
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float c_phase,
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float mag_total,
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float x, float y,
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int n);
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void (*upmix_5_1)(AVFilterContext *ctx,
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float c_re, float c_im,
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float lfe_re, float lfe_im,
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float mag_totall, float mag_totalr,
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float fl_phase, float fr_phase,
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float bl_phase, float br_phase,
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float sl_phase, float sr_phase,
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float xl, float yl,
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float xr, float yr,
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int n);
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} AudioSurroundContext;
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static int query_formats(AVFilterContext *ctx)
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{
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AudioSurroundContext *s = ctx->priv;
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AVFilterFormats *formats = NULL;
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AVFilterChannelLayouts *layouts = NULL;
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int ret;
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ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLTP);
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if (ret)
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return ret;
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ret = ff_set_common_formats(ctx, formats);
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if (ret)
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return ret;
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layouts = NULL;
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ret = ff_add_channel_layout(&layouts, s->out_channel_layout);
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if (ret)
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return ret;
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ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);
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if (ret)
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return ret;
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layouts = NULL;
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ret = ff_add_channel_layout(&layouts, s->in_channel_layout);
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if (ret)
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return ret;
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ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->out_channel_layouts);
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if (ret)
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return ret;
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formats = ff_all_samplerates();
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if (!formats)
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return AVERROR(ENOMEM);
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return ff_set_common_samplerates(ctx, formats);
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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AudioSurroundContext *s = ctx->priv;
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int ch;
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s->rdft = av_calloc(inlink->channels, sizeof(*s->rdft));
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if (!s->rdft)
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return AVERROR(ENOMEM);
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for (ch = 0; ch < inlink->channels; ch++) {
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s->rdft[ch] = av_rdft_init(ff_log2(s->buf_size), DFT_R2C);
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if (!s->rdft[ch])
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return AVERROR(ENOMEM);
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}
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s->nb_in_channels = inlink->channels;
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s->input_levels = av_malloc_array(s->nb_in_channels, sizeof(*s->input_levels));
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if (!s->input_levels)
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return AVERROR(ENOMEM);
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for (ch = 0; ch < s->nb_in_channels; ch++)
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s->input_levels[ch] = s->level_in;
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ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_FRONT_CENTER);
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if (ch >= 0)
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s->input_levels[ch] *= s->fc_in;
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ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_LOW_FREQUENCY);
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if (ch >= 0)
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s->input_levels[ch] *= s->lfe_in;
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s->input = ff_get_audio_buffer(inlink, s->buf_size * 2);
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if (!s->input)
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return AVERROR(ENOMEM);
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s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->buf_size);
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if (!s->fifo)
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return AVERROR(ENOMEM);
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s->lowcut = 1.f * s->lowcutf / (inlink->sample_rate * 0.5) * (s->buf_size / 2);
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s->highcut = 1.f * s->highcutf / (inlink->sample_rate * 0.5) * (s->buf_size / 2);
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AudioSurroundContext *s = ctx->priv;
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int ch;
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s->irdft = av_calloc(outlink->channels, sizeof(*s->irdft));
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if (!s->irdft)
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return AVERROR(ENOMEM);
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for (ch = 0; ch < outlink->channels; ch++) {
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s->irdft[ch] = av_rdft_init(ff_log2(s->buf_size), IDFT_C2R);
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if (!s->irdft[ch])
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return AVERROR(ENOMEM);
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}
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s->nb_out_channels = outlink->channels;
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s->output_levels = av_malloc_array(s->nb_out_channels, sizeof(*s->output_levels));
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if (!s->output_levels)
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return AVERROR(ENOMEM);
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for (ch = 0; ch < s->nb_out_channels; ch++)
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s->output_levels[ch] = s->level_out;
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ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_FRONT_CENTER);
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if (ch >= 0)
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s->output_levels[ch] *= s->fc_out;
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ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_LOW_FREQUENCY);
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if (ch >= 0)
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s->output_levels[ch] *= s->lfe_out;
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s->output = ff_get_audio_buffer(outlink, s->buf_size * 2);
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s->overlap_buffer = ff_get_audio_buffer(outlink, s->buf_size * 2);
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if (!s->overlap_buffer || !s->output)
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return AVERROR(ENOMEM);
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return 0;
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}
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static void stereo_position(float a, float p, float *x, float *y)
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{
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*x = av_clipf(a+FFMAX(0, sinf(p-M_PI_2))*FFDIFFSIGN(a,0), -1, 1);
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*y = av_clipf(cosf(a*M_PI_2+M_PI)*cosf(M_PI_2-p/M_PI)*M_LN10+1, -1, 1);
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}
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static inline void get_lfe(int output_lfe, int n, float lowcut, float highcut,
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float *lfe_mag, float *mag_total)
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{
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if (output_lfe && n < highcut) {
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*lfe_mag = n < lowcut ? 1.f : .5f*(1.f+cosf(M_PI*(lowcut-n)/(lowcut-highcut)));
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*lfe_mag *= *mag_total;
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*mag_total -= *lfe_mag;
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} else {
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*lfe_mag = 0.f;
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}
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}
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static void upmix_1_0(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float x, float y,
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int n)
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{
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AudioSurroundContext *s = ctx->priv;
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float mag, *dst;
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dst = (float *)s->output->extended_data[0];
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mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
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dst[2 * n ] = mag * cosf(c_phase);
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dst[2 * n + 1] = mag * sinf(c_phase);
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}
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static void upmix_stereo(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float x, float y,
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int n)
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{
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AudioSurroundContext *s = ctx->priv;
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float l_mag, r_mag, *dstl, *dstr;
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dstl = (float *)s->output->extended_data[0];
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dstr = (float *)s->output->extended_data[1];
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l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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dstl[2 * n ] = l_mag * cosf(l_phase);
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dstl[2 * n + 1] = l_mag * sinf(l_phase);
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dstr[2 * n ] = r_mag * cosf(r_phase);
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dstr[2 * n + 1] = r_mag * sinf(r_phase);
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}
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static void upmix_2_1(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float x, float y,
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int n)
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{
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AudioSurroundContext *s = ctx->priv;
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float lfe_mag, l_mag, r_mag, *dstl, *dstr, *dstlfe;
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dstl = (float *)s->output->extended_data[0];
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dstr = (float *)s->output->extended_data[1];
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dstlfe = (float *)s->output->extended_data[2];
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get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total);
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l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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dstl[2 * n ] = l_mag * cosf(l_phase);
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dstl[2 * n + 1] = l_mag * sinf(l_phase);
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dstr[2 * n ] = r_mag * cosf(r_phase);
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dstr[2 * n + 1] = r_mag * sinf(r_phase);
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dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
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dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
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}
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static void upmix_3_0(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float x, float y,
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int n)
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{
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AudioSurroundContext *s = ctx->priv;
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float l_mag, r_mag, c_mag, *dstc, *dstl, *dstr;
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dstl = (float *)s->output->extended_data[0];
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dstr = (float *)s->output->extended_data[1];
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dstc = (float *)s->output->extended_data[2];
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c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
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l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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dstl[2 * n ] = l_mag * cosf(l_phase);
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dstl[2 * n + 1] = l_mag * sinf(l_phase);
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dstr[2 * n ] = r_mag * cosf(r_phase);
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dstr[2 * n + 1] = r_mag * sinf(r_phase);
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dstc[2 * n ] = c_mag * cosf(c_phase);
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dstc[2 * n + 1] = c_mag * sinf(c_phase);
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}
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static void upmix_3_1(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float x, float y,
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int n)
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{
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AudioSurroundContext *s = ctx->priv;
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float lfe_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstlfe;
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dstl = (float *)s->output->extended_data[0];
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dstr = (float *)s->output->extended_data[1];
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dstc = (float *)s->output->extended_data[2];
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dstlfe = (float *)s->output->extended_data[3];
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get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total);
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c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
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l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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dstl[2 * n ] = l_mag * cosf(l_phase);
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dstl[2 * n + 1] = l_mag * sinf(l_phase);
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dstr[2 * n ] = r_mag * cosf(r_phase);
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dstr[2 * n + 1] = r_mag * sinf(r_phase);
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dstc[2 * n ] = c_mag * cosf(c_phase);
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dstc[2 * n + 1] = c_mag * sinf(c_phase);
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dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
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dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
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}
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static void upmix_3_1_surround(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float c_mag,
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float mag_total,
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float x, float y,
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int n)
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{
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AudioSurroundContext *s = ctx->priv;
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float lfe_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
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dstl = (float *)s->output->extended_data[0];
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dstr = (float *)s->output->extended_data[1];
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dstc = (float *)s->output->extended_data[2];
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dstlfe = (float *)s->output->extended_data[3];
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get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &c_mag);
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l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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dstl[2 * n ] = l_mag * cosf(l_phase);
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dstl[2 * n + 1] = l_mag * sinf(l_phase);
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dstr[2 * n ] = r_mag * cosf(r_phase);
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dstr[2 * n + 1] = r_mag * sinf(r_phase);
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dstc[2 * n ] = c_mag * cosf(c_phase);
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dstc[2 * n + 1] = c_mag * sinf(c_phase);
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dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
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dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
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}
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static void upmix_4_0(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float x, float y,
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int n)
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{
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float b_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstb;
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AudioSurroundContext *s = ctx->priv;
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dstl = (float *)s->output->extended_data[0];
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dstr = (float *)s->output->extended_data[1];
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dstc = (float *)s->output->extended_data[2];
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dstb = (float *)s->output->extended_data[3];
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c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
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b_mag = sqrtf(1.f - fabsf(x)) * ((1.f - y) * .5f) * mag_total;
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l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
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dstl[2 * n ] = l_mag * cosf(l_phase);
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dstl[2 * n + 1] = l_mag * sinf(l_phase);
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dstr[2 * n ] = r_mag * cosf(r_phase);
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dstr[2 * n + 1] = r_mag * sinf(r_phase);
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dstc[2 * n ] = c_mag * cosf(c_phase);
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dstc[2 * n + 1] = c_mag * sinf(c_phase);
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dstb[2 * n ] = b_mag * cosf(c_phase);
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dstb[2 * n + 1] = b_mag * sinf(c_phase);
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}
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static void upmix_4_1(AVFilterContext *ctx,
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float l_phase,
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float r_phase,
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float c_phase,
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float mag_total,
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float x, float y,
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int n)
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{
|
|
float lfe_mag, b_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstb, *dstlfe;
|
|
AudioSurroundContext *s = ctx->priv;
|
|
|
|
dstl = (float *)s->output->extended_data[0];
|
|
dstr = (float *)s->output->extended_data[1];
|
|
dstc = (float *)s->output->extended_data[2];
|
|
dstlfe = (float *)s->output->extended_data[3];
|
|
dstb = (float *)s->output->extended_data[4];
|
|
|
|
get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total);
|
|
|
|
dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
|
|
dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
|
|
|
|
c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
|
|
b_mag = sqrtf(1.f - fabsf(x)) * ((1.f - y) * .5f) * mag_total;
|
|
l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
|
|
dstl[2 * n ] = l_mag * cosf(l_phase);
|
|
dstl[2 * n + 1] = l_mag * sinf(l_phase);
|
|
|
|
dstr[2 * n ] = r_mag * cosf(r_phase);
|
|
dstr[2 * n + 1] = r_mag * sinf(r_phase);
|
|
|
|
dstc[2 * n ] = c_mag * cosf(c_phase);
|
|
dstc[2 * n + 1] = c_mag * sinf(c_phase);
|
|
|
|
dstb[2 * n ] = b_mag * cosf(c_phase);
|
|
dstb[2 * n + 1] = b_mag * sinf(c_phase);
|
|
}
|
|
|
|
static void upmix_5_0_back(AVFilterContext *ctx,
|
|
float l_phase,
|
|
float r_phase,
|
|
float c_phase,
|
|
float mag_total,
|
|
float x, float y,
|
|
int n)
|
|
{
|
|
float l_mag, r_mag, ls_mag, rs_mag, c_mag, *dstc, *dstl, *dstr, *dstls, *dstrs;
|
|
AudioSurroundContext *s = ctx->priv;
|
|
|
|
dstl = (float *)s->output->extended_data[0];
|
|
dstr = (float *)s->output->extended_data[1];
|
|
dstc = (float *)s->output->extended_data[2];
|
|
dstls = (float *)s->output->extended_data[3];
|
|
dstrs = (float *)s->output->extended_data[4];
|
|
|
|
c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
|
|
l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
ls_mag = sqrtf(.5f * ( x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
rs_mag = sqrtf(.5f * (-x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
|
|
dstl[2 * n ] = l_mag * cosf(l_phase);
|
|
dstl[2 * n + 1] = l_mag * sinf(l_phase);
|
|
|
|
dstr[2 * n ] = r_mag * cosf(r_phase);
|
|
dstr[2 * n + 1] = r_mag * sinf(r_phase);
|
|
|
|
dstc[2 * n ] = c_mag * cosf(c_phase);
|
|
dstc[2 * n + 1] = c_mag * sinf(c_phase);
|
|
|
|
dstls[2 * n ] = ls_mag * cosf(l_phase);
|
|
dstls[2 * n + 1] = ls_mag * sinf(l_phase);
|
|
|
|
dstrs[2 * n ] = rs_mag * cosf(r_phase);
|
|
dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
|
|
}
|
|
|
|
static void upmix_5_1_back(AVFilterContext *ctx,
|
|
float l_phase,
|
|
float r_phase,
|
|
float c_phase,
|
|
float mag_total,
|
|
float x, float y,
|
|
int n)
|
|
{
|
|
float lfe_mag, l_mag, r_mag, ls_mag, rs_mag, c_mag, *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlfe;
|
|
AudioSurroundContext *s = ctx->priv;
|
|
|
|
dstl = (float *)s->output->extended_data[0];
|
|
dstr = (float *)s->output->extended_data[1];
|
|
dstc = (float *)s->output->extended_data[2];
|
|
dstlfe = (float *)s->output->extended_data[3];
|
|
dstls = (float *)s->output->extended_data[4];
|
|
dstrs = (float *)s->output->extended_data[5];
|
|
|
|
get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total);
|
|
|
|
c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
|
|
l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
ls_mag = sqrtf(.5f * ( x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
rs_mag = sqrtf(.5f * (-x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
|
|
dstl[2 * n ] = l_mag * cosf(l_phase);
|
|
dstl[2 * n + 1] = l_mag * sinf(l_phase);
|
|
|
|
dstr[2 * n ] = r_mag * cosf(r_phase);
|
|
dstr[2 * n + 1] = r_mag * sinf(r_phase);
|
|
|
|
dstc[2 * n ] = c_mag * cosf(c_phase);
|
|
dstc[2 * n + 1] = c_mag * sinf(c_phase);
|
|
|
|
dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
|
|
dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
|
|
|
|
dstls[2 * n ] = ls_mag * cosf(l_phase);
|
|
dstls[2 * n + 1] = ls_mag * sinf(l_phase);
|
|
|
|
dstrs[2 * n ] = rs_mag * cosf(r_phase);
|
|
dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
|
|
}
|
|
|
|
static void upmix_5_1_back_surround(AVFilterContext *ctx,
|
|
float l_phase,
|
|
float r_phase,
|
|
float c_phase,
|
|
float c_mag,
|
|
float mag_total,
|
|
float x, float y,
|
|
int n)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
float lfe_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
|
|
float ls_mag, rs_mag, *dstls, *dstrs;
|
|
|
|
dstl = (float *)s->output->extended_data[0];
|
|
dstr = (float *)s->output->extended_data[1];
|
|
dstc = (float *)s->output->extended_data[2];
|
|
dstlfe = (float *)s->output->extended_data[3];
|
|
dstls = (float *)s->output->extended_data[4];
|
|
dstrs = (float *)s->output->extended_data[5];
|
|
|
|
get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &c_mag);
|
|
|
|
l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
ls_mag = sqrtf(.5f * ( x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
rs_mag = sqrtf(.5f * (-x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
|
|
dstl[2 * n ] = l_mag * cosf(l_phase);
|
|
dstl[2 * n + 1] = l_mag * sinf(l_phase);
|
|
|
|
dstr[2 * n ] = r_mag * cosf(r_phase);
|
|
dstr[2 * n + 1] = r_mag * sinf(r_phase);
|
|
|
|
dstc[2 * n ] = c_mag * cosf(c_phase);
|
|
dstc[2 * n + 1] = c_mag * sinf(c_phase);
|
|
|
|
dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
|
|
dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
|
|
|
|
dstls[2 * n ] = ls_mag * cosf(l_phase);
|
|
dstls[2 * n + 1] = ls_mag * sinf(l_phase);
|
|
|
|
dstrs[2 * n ] = rs_mag * cosf(r_phase);
|
|
dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
|
|
}
|
|
|
|
static void upmix_5_1_back_2_1(AVFilterContext *ctx,
|
|
float l_phase,
|
|
float r_phase,
|
|
float c_phase,
|
|
float mag_total,
|
|
float lfe_re,
|
|
float lfe_im,
|
|
float x, float y,
|
|
int n)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
float c_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
|
|
float ls_mag, rs_mag, *dstls, *dstrs;
|
|
|
|
dstl = (float *)s->output->extended_data[0];
|
|
dstr = (float *)s->output->extended_data[1];
|
|
dstc = (float *)s->output->extended_data[2];
|
|
dstlfe = (float *)s->output->extended_data[3];
|
|
dstls = (float *)s->output->extended_data[4];
|
|
dstrs = (float *)s->output->extended_data[5];
|
|
|
|
c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
|
|
l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
ls_mag = sqrtf(.5f * ( x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
rs_mag = sqrtf(.5f * (-x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
|
|
dstl[2 * n ] = l_mag * cosf(l_phase);
|
|
dstl[2 * n + 1] = l_mag * sinf(l_phase);
|
|
|
|
dstr[2 * n ] = r_mag * cosf(r_phase);
|
|
dstr[2 * n + 1] = r_mag * sinf(r_phase);
|
|
|
|
dstc[2 * n ] = c_mag * cosf(c_phase);
|
|
dstc[2 * n + 1] = c_mag * sinf(c_phase);
|
|
|
|
dstlfe[2 * n ] = lfe_re;
|
|
dstlfe[2 * n + 1] = lfe_im;
|
|
|
|
dstls[2 * n ] = ls_mag * cosf(l_phase);
|
|
dstls[2 * n + 1] = ls_mag * sinf(l_phase);
|
|
|
|
dstrs[2 * n ] = rs_mag * cosf(r_phase);
|
|
dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
|
|
}
|
|
|
|
static void upmix_7_0(AVFilterContext *ctx,
|
|
float l_phase,
|
|
float r_phase,
|
|
float c_phase,
|
|
float mag_total,
|
|
float x, float y,
|
|
int n)
|
|
{
|
|
float l_mag, r_mag, ls_mag, rs_mag, c_mag, lb_mag, rb_mag;
|
|
float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb;
|
|
AudioSurroundContext *s = ctx->priv;
|
|
|
|
dstl = (float *)s->output->extended_data[0];
|
|
dstr = (float *)s->output->extended_data[1];
|
|
dstc = (float *)s->output->extended_data[2];
|
|
dstlb = (float *)s->output->extended_data[3];
|
|
dstrb = (float *)s->output->extended_data[4];
|
|
dstls = (float *)s->output->extended_data[5];
|
|
dstrs = (float *)s->output->extended_data[6];
|
|
|
|
c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
|
|
l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
lb_mag = sqrtf(.5f * ( x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
rb_mag = sqrtf(.5f * (-x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
ls_mag = sqrtf(.5f * ( x + 1.f)) * (1.f - fabsf(y)) * mag_total;
|
|
rs_mag = sqrtf(.5f * (-x + 1.f)) * (1.f - fabsf(y)) * mag_total;
|
|
|
|
dstl[2 * n ] = l_mag * cosf(l_phase);
|
|
dstl[2 * n + 1] = l_mag * sinf(l_phase);
|
|
|
|
dstr[2 * n ] = r_mag * cosf(r_phase);
|
|
dstr[2 * n + 1] = r_mag * sinf(r_phase);
|
|
|
|
dstc[2 * n ] = c_mag * cosf(c_phase);
|
|
dstc[2 * n + 1] = c_mag * sinf(c_phase);
|
|
|
|
dstlb[2 * n ] = lb_mag * cosf(l_phase);
|
|
dstlb[2 * n + 1] = lb_mag * sinf(l_phase);
|
|
|
|
dstrb[2 * n ] = rb_mag * cosf(r_phase);
|
|
dstrb[2 * n + 1] = rb_mag * sinf(r_phase);
|
|
|
|
dstls[2 * n ] = ls_mag * cosf(l_phase);
|
|
dstls[2 * n + 1] = ls_mag * sinf(l_phase);
|
|
|
|
dstrs[2 * n ] = rs_mag * cosf(r_phase);
|
|
dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
|
|
}
|
|
|
|
static void upmix_7_1(AVFilterContext *ctx,
|
|
float l_phase,
|
|
float r_phase,
|
|
float c_phase,
|
|
float mag_total,
|
|
float x, float y,
|
|
int n)
|
|
{
|
|
float lfe_mag, l_mag, r_mag, ls_mag, rs_mag, c_mag, lb_mag, rb_mag;
|
|
float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
|
|
AudioSurroundContext *s = ctx->priv;
|
|
|
|
dstl = (float *)s->output->extended_data[0];
|
|
dstr = (float *)s->output->extended_data[1];
|
|
dstc = (float *)s->output->extended_data[2];
|
|
dstlfe = (float *)s->output->extended_data[3];
|
|
dstlb = (float *)s->output->extended_data[4];
|
|
dstrb = (float *)s->output->extended_data[5];
|
|
dstls = (float *)s->output->extended_data[6];
|
|
dstrs = (float *)s->output->extended_data[7];
|
|
|
|
get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total);
|
|
|
|
c_mag = sqrtf(1.f - fabsf(x)) * ((y + 1.f) * .5f) * mag_total;
|
|
l_mag = sqrtf(.5f * ( x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
r_mag = sqrtf(.5f * (-x + 1.f)) * ((y + 1.f) * .5f) * mag_total;
|
|
lb_mag = sqrtf(.5f * ( x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
rb_mag = sqrtf(.5f * (-x + 1.f)) * (1.f - ((y + 1.f) * .5f)) * mag_total;
|
|
ls_mag = sqrtf(.5f * ( x + 1.f)) * (1.f - fabsf(y)) * mag_total;
|
|
rs_mag = sqrtf(.5f * (-x + 1.f)) * (1.f - fabsf(y)) * mag_total;
|
|
|
|
dstl[2 * n ] = l_mag * cosf(l_phase);
|
|
dstl[2 * n + 1] = l_mag * sinf(l_phase);
|
|
|
|
dstr[2 * n ] = r_mag * cosf(r_phase);
|
|
dstr[2 * n + 1] = r_mag * sinf(r_phase);
|
|
|
|
dstc[2 * n ] = c_mag * cosf(c_phase);
|
|
dstc[2 * n + 1] = c_mag * sinf(c_phase);
|
|
|
|
dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
|
|
dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
|
|
|
|
dstlb[2 * n ] = lb_mag * cosf(l_phase);
|
|
dstlb[2 * n + 1] = lb_mag * sinf(l_phase);
|
|
|
|
dstrb[2 * n ] = rb_mag * cosf(r_phase);
|
|
dstrb[2 * n + 1] = rb_mag * sinf(r_phase);
|
|
|
|
dstls[2 * n ] = ls_mag * cosf(l_phase);
|
|
dstls[2 * n + 1] = ls_mag * sinf(l_phase);
|
|
|
|
dstrs[2 * n ] = rs_mag * cosf(r_phase);
|
|
dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
|
|
}
|
|
|
|
static void upmix_7_1_5_1(AVFilterContext *ctx,
|
|
float c_re, float c_im,
|
|
float lfe_re, float lfe_im,
|
|
float mag_totall, float mag_totalr,
|
|
float fl_phase, float fr_phase,
|
|
float bl_phase, float br_phase,
|
|
float sl_phase, float sr_phase,
|
|
float xl, float yl,
|
|
float xr, float yr,
|
|
int n)
|
|
{
|
|
float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
|
|
float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
|
|
AudioSurroundContext *s = ctx->priv;
|
|
|
|
dstl = (float *)s->output->extended_data[0];
|
|
dstr = (float *)s->output->extended_data[1];
|
|
dstc = (float *)s->output->extended_data[2];
|
|
dstlfe = (float *)s->output->extended_data[3];
|
|
dstlb = (float *)s->output->extended_data[4];
|
|
dstrb = (float *)s->output->extended_data[5];
|
|
dstls = (float *)s->output->extended_data[6];
|
|
dstrs = (float *)s->output->extended_data[7];
|
|
|
|
fl_mag = sqrtf(.5f * (xl + 1.f)) * ((yl + 1.f) * .5f) * mag_totall;
|
|
fr_mag = sqrtf(.5f * (xr + 1.f)) * ((yr + 1.f) * .5f) * mag_totalr;
|
|
lb_mag = sqrtf(.5f * (-xl + 1.f)) * ((yl + 1.f) * .5f) * mag_totall;
|
|
rb_mag = sqrtf(.5f * (-xr + 1.f)) * ((yr + 1.f) * .5f) * mag_totalr;
|
|
ls_mag = sqrtf(1.f - fabsf(xl)) * ((yl + 1.f) * .5f) * mag_totall;
|
|
rs_mag = sqrtf(1.f - fabsf(xr)) * ((yr + 1.f) * .5f) * mag_totalr;
|
|
|
|
dstl[2 * n ] = fl_mag * cosf(fl_phase);
|
|
dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
|
|
|
|
dstr[2 * n ] = fr_mag * cosf(fr_phase);
|
|
dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
|
|
|
|
dstc[2 * n ] = c_re;
|
|
dstc[2 * n + 1] = c_im;
|
|
|
|
dstlfe[2 * n ] = lfe_re;
|
|
dstlfe[2 * n + 1] = lfe_im;
|
|
|
|
dstlb[2 * n ] = lb_mag * cosf(bl_phase);
|
|
dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
|
|
|
|
dstrb[2 * n ] = rb_mag * cosf(br_phase);
|
|
dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
|
|
|
|
dstls[2 * n ] = ls_mag * cosf(sl_phase);
|
|
dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
|
|
|
|
dstrs[2 * n ] = rs_mag * cosf(sr_phase);
|
|
dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
|
|
}
|
|
|
|
static void filter_stereo(AVFilterContext *ctx)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
float *srcl, *srcr;
|
|
int n;
|
|
|
|
srcl = (float *)s->input->extended_data[0];
|
|
srcr = (float *)s->input->extended_data[1];
|
|
|
|
for (n = 0; n < s->buf_size; n++) {
|
|
float l_re = srcl[2 * n], r_re = srcr[2 * n];
|
|
float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
|
|
float c_phase = atan2f(l_im + r_im, l_re + r_re);
|
|
float l_mag = hypotf(l_re, l_im);
|
|
float r_mag = hypotf(r_re, r_im);
|
|
float l_phase = atan2f(l_im, l_re);
|
|
float r_phase = atan2f(r_im, r_re);
|
|
float phase_dif = fabsf(l_phase - r_phase);
|
|
float mag_dif = (l_mag - r_mag) / (l_mag + r_mag);
|
|
float mag_total = hypotf(l_mag, r_mag);
|
|
float x, y;
|
|
|
|
if (phase_dif > M_PI)
|
|
phase_dif = 2 * M_PI - phase_dif;
|
|
|
|
stereo_position(mag_dif, phase_dif, &x, &y);
|
|
|
|
s->upmix_stereo(ctx, l_phase, r_phase, c_phase, mag_total, x, y, n);
|
|
}
|
|
}
|
|
|
|
static void filter_surround(AVFilterContext *ctx)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
float *srcl, *srcr, *srcc;
|
|
int n;
|
|
|
|
srcl = (float *)s->input->extended_data[0];
|
|
srcr = (float *)s->input->extended_data[1];
|
|
srcc = (float *)s->input->extended_data[2];
|
|
|
|
for (n = 0; n < s->buf_size; n++) {
|
|
float l_re = srcl[2 * n], r_re = srcr[2 * n];
|
|
float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
|
|
float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
|
|
float c_mag = hypotf(c_re, c_im);
|
|
float c_phase = atan2f(c_im, c_re);
|
|
float l_mag = hypotf(l_re, l_im);
|
|
float r_mag = hypotf(r_re, r_im);
|
|
float l_phase = atan2f(l_im, l_re);
|
|
float r_phase = atan2f(r_im, r_re);
|
|
float phase_dif = fabsf(l_phase - r_phase);
|
|
float mag_dif = (l_mag - r_mag) / (l_mag + r_mag);
|
|
float mag_total = hypotf(l_mag, r_mag);
|
|
float x, y;
|
|
|
|
if (phase_dif > M_PI)
|
|
phase_dif = 2 * M_PI - phase_dif;
|
|
|
|
stereo_position(mag_dif, phase_dif, &x, &y);
|
|
|
|
s->upmix_3_0(ctx, l_phase, r_phase, c_phase, c_mag, mag_total, x, y, n);
|
|
}
|
|
}
|
|
|
|
static void filter_2_1(AVFilterContext *ctx)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
float *srcl, *srcr, *srclfe;
|
|
int n;
|
|
|
|
srcl = (float *)s->input->extended_data[0];
|
|
srcr = (float *)s->input->extended_data[1];
|
|
srclfe = (float *)s->input->extended_data[2];
|
|
|
|
for (n = 0; n < s->buf_size; n++) {
|
|
float l_re = srcl[2 * n], r_re = srcr[2 * n];
|
|
float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
|
|
float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
|
|
float c_phase = atan2f(l_im + r_im, l_re + r_re);
|
|
float l_mag = hypotf(l_re, l_im);
|
|
float r_mag = hypotf(r_re, r_im);
|
|
float l_phase = atan2f(l_im, l_re);
|
|
float r_phase = atan2f(r_im, r_re);
|
|
float phase_dif = fabsf(l_phase - r_phase);
|
|
float mag_dif = (l_mag - r_mag) / (l_mag + r_mag);
|
|
float mag_total = hypotf(l_mag, r_mag);
|
|
float x, y;
|
|
|
|
if (phase_dif > M_PI)
|
|
phase_dif = 2 * M_PI - phase_dif;
|
|
|
|
stereo_position(mag_dif, phase_dif, &x, &y);
|
|
|
|
s->upmix_2_1(ctx, l_phase, r_phase, c_phase, mag_total, lfe_re, lfe_im, x, y, n);
|
|
}
|
|
}
|
|
|
|
static void filter_5_1_back(AVFilterContext *ctx)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
float *srcl, *srcr, *srcc, *srclfe, *srcbl, *srcbr;
|
|
int n;
|
|
|
|
srcl = (float *)s->input->extended_data[0];
|
|
srcr = (float *)s->input->extended_data[1];
|
|
srcc = (float *)s->input->extended_data[2];
|
|
srclfe = (float *)s->input->extended_data[3];
|
|
srcbl = (float *)s->input->extended_data[4];
|
|
srcbr = (float *)s->input->extended_data[5];
|
|
|
|
for (n = 0; n < s->buf_size; n++) {
|
|
float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
|
|
float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
|
|
float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
|
|
float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
|
|
float bl_re = srcbl[2 * n], bl_im = srcbl[2 * n + 1];
|
|
float br_re = srcbr[2 * n], br_im = srcbr[2 * n + 1];
|
|
float fl_mag = hypotf(fl_re, fl_im);
|
|
float fr_mag = hypotf(fr_re, fr_im);
|
|
float fl_phase = atan2f(fl_im, fl_re);
|
|
float fr_phase = atan2f(fr_im, fr_re);
|
|
float bl_mag = hypotf(bl_re, bl_im);
|
|
float br_mag = hypotf(br_re, br_im);
|
|
float bl_phase = atan2f(bl_im, bl_re);
|
|
float br_phase = atan2f(br_im, br_re);
|
|
float phase_difl = fabsf(fl_phase - bl_phase);
|
|
float phase_difr = fabsf(fr_phase - br_phase);
|
|
float mag_difl = (fl_mag - bl_mag) / (fl_mag + bl_mag);
|
|
float mag_difr = (fr_mag - br_mag) / (fr_mag + br_mag);
|
|
float mag_totall = hypotf(fl_mag, bl_mag);
|
|
float mag_totalr = hypotf(fr_mag, br_mag);
|
|
float sl_phase = atan2f(fl_im + bl_im, fl_re + bl_re);
|
|
float sr_phase = atan2f(fr_im + br_im, fr_re + br_re);
|
|
float xl, yl;
|
|
float xr, yr;
|
|
|
|
if (phase_difl > M_PI)
|
|
phase_difl = 2 * M_PI - phase_difl;
|
|
|
|
if (phase_difr > M_PI)
|
|
phase_difr = 2 * M_PI - phase_difr;
|
|
|
|
stereo_position(mag_difl, phase_difl, &xl, &yl);
|
|
stereo_position(mag_difr, phase_difr, &xr, &yr);
|
|
|
|
s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
|
|
mag_totall, mag_totalr,
|
|
fl_phase, fr_phase,
|
|
bl_phase, br_phase,
|
|
sl_phase, sr_phase,
|
|
xl, yl, xr, yr, n);
|
|
}
|
|
}
|
|
|
|
static int init(AVFilterContext *ctx)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
float overlap;
|
|
int i;
|
|
|
|
if (!(s->out_channel_layout = av_get_channel_layout(s->out_channel_layout_str))) {
|
|
av_log(ctx, AV_LOG_ERROR, "Error parsing output channel layout '%s'.\n",
|
|
s->out_channel_layout_str);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (!(s->in_channel_layout = av_get_channel_layout(s->in_channel_layout_str))) {
|
|
av_log(ctx, AV_LOG_ERROR, "Error parsing input channel layout '%s'.\n",
|
|
s->in_channel_layout_str);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (s->lowcutf >= s->highcutf) {
|
|
av_log(ctx, AV_LOG_ERROR, "Low cut-off '%d' should be less than high cut-off '%d'.\n",
|
|
s->lowcutf, s->highcutf);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
switch (s->in_channel_layout) {
|
|
case AV_CH_LAYOUT_STEREO:
|
|
s->filter = filter_stereo;
|
|
switch (s->out_channel_layout) {
|
|
case AV_CH_LAYOUT_MONO:
|
|
s->upmix_stereo = upmix_1_0;
|
|
break;
|
|
case AV_CH_LAYOUT_STEREO:
|
|
s->upmix_stereo = upmix_stereo;
|
|
break;
|
|
case AV_CH_LAYOUT_2POINT1:
|
|
s->upmix_stereo = upmix_2_1;
|
|
break;
|
|
case AV_CH_LAYOUT_SURROUND:
|
|
s->upmix_stereo = upmix_3_0;
|
|
break;
|
|
case AV_CH_LAYOUT_3POINT1:
|
|
s->upmix_stereo = upmix_3_1;
|
|
break;
|
|
case AV_CH_LAYOUT_4POINT0:
|
|
s->upmix_stereo = upmix_4_0;
|
|
break;
|
|
case AV_CH_LAYOUT_4POINT1:
|
|
s->upmix_stereo = upmix_4_1;
|
|
break;
|
|
case AV_CH_LAYOUT_5POINT0_BACK:
|
|
s->upmix_stereo = upmix_5_0_back;
|
|
break;
|
|
case AV_CH_LAYOUT_5POINT1_BACK:
|
|
s->upmix_stereo = upmix_5_1_back;
|
|
break;
|
|
case AV_CH_LAYOUT_7POINT0:
|
|
s->upmix_stereo = upmix_7_0;
|
|
break;
|
|
case AV_CH_LAYOUT_7POINT1:
|
|
s->upmix_stereo = upmix_7_1;
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
break;
|
|
case AV_CH_LAYOUT_2POINT1:
|
|
s->filter = filter_2_1;
|
|
switch (s->out_channel_layout) {
|
|
case AV_CH_LAYOUT_5POINT1_BACK:
|
|
s->upmix_2_1 = upmix_5_1_back_2_1;
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
break;
|
|
case AV_CH_LAYOUT_SURROUND:
|
|
s->filter = filter_surround;
|
|
switch (s->out_channel_layout) {
|
|
case AV_CH_LAYOUT_3POINT1:
|
|
s->upmix_3_0 = upmix_3_1_surround;
|
|
break;
|
|
case AV_CH_LAYOUT_5POINT1_BACK:
|
|
s->upmix_3_0 = upmix_5_1_back_surround;
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
break;
|
|
case AV_CH_LAYOUT_5POINT1_BACK:
|
|
s->filter = filter_5_1_back;
|
|
switch (s->out_channel_layout) {
|
|
case AV_CH_LAYOUT_7POINT1:
|
|
s->upmix_5_1 = upmix_7_1_5_1;
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
break;
|
|
default:
|
|
fail:
|
|
av_log(ctx, AV_LOG_ERROR, "Unsupported upmix: '%s' -> '%s'.\n",
|
|
s->in_channel_layout_str, s->out_channel_layout_str);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
s->buf_size = 4096;
|
|
s->pts = AV_NOPTS_VALUE;
|
|
|
|
s->window_func_lut = av_calloc(s->buf_size, sizeof(*s->window_func_lut));
|
|
if (!s->window_func_lut)
|
|
return AVERROR(ENOMEM);
|
|
|
|
for (i = 0; i < s->buf_size; i++)
|
|
s->window_func_lut[i] = sqrtf(0.5 * (1 - cosf(2 * M_PI * i / s->buf_size)) / s->buf_size);
|
|
overlap = .5;
|
|
s->hop_size = s->buf_size * (1. - overlap);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
const float level_in = s->input_levels[ch];
|
|
float *dst;
|
|
int n;
|
|
|
|
memset(s->input->extended_data[ch] + s->buf_size * sizeof(float), 0, s->buf_size * sizeof(float));
|
|
|
|
dst = (float *)s->input->extended_data[ch];
|
|
for (n = 0; n < s->buf_size; n++) {
|
|
dst[n] *= s->window_func_lut[n] * level_in;
|
|
}
|
|
|
|
av_rdft_calc(s->rdft[ch], (float *)s->input->extended_data[ch]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ifft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
const float level_out = s->output_levels[ch];
|
|
AVFrame *out = arg;
|
|
float *dst, *ptr;
|
|
int n;
|
|
|
|
av_rdft_calc(s->irdft[ch], (float *)s->output->extended_data[ch]);
|
|
|
|
dst = (float *)s->output->extended_data[ch];
|
|
ptr = (float *)s->overlap_buffer->extended_data[ch];
|
|
|
|
memmove(s->overlap_buffer->extended_data[ch],
|
|
s->overlap_buffer->extended_data[ch] + s->hop_size * sizeof(float),
|
|
s->buf_size * sizeof(float));
|
|
memset(s->overlap_buffer->extended_data[ch] + s->buf_size * sizeof(float),
|
|
0, s->hop_size * sizeof(float));
|
|
|
|
for (n = 0; n < s->buf_size; n++) {
|
|
ptr[n] += dst[n] * s->window_func_lut[n] * level_out;
|
|
}
|
|
|
|
ptr = (float *)s->overlap_buffer->extended_data[ch];
|
|
dst = (float *)out->extended_data[ch];
|
|
memcpy(dst, ptr, s->hop_size * sizeof(float));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
AudioSurroundContext *s = ctx->priv;
|
|
|
|
av_audio_fifo_write(s->fifo, (void **)in->extended_data,
|
|
in->nb_samples);
|
|
|
|
if (s->pts == AV_NOPTS_VALUE)
|
|
s->pts = in->pts;
|
|
|
|
av_frame_free(&in);
|
|
|
|
while (av_audio_fifo_size(s->fifo) >= s->buf_size) {
|
|
AVFrame *out;
|
|
int ret;
|
|
|
|
ret = av_audio_fifo_peek(s->fifo, (void **)s->input->extended_data, s->buf_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ctx->internal->execute(ctx, fft_channel, NULL, NULL, inlink->channels);
|
|
|
|
s->filter(ctx);
|
|
|
|
out = ff_get_audio_buffer(outlink, s->hop_size);
|
|
if (!out)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ctx->internal->execute(ctx, ifft_channel, out, NULL, outlink->channels);
|
|
|
|
out->pts = s->pts;
|
|
if (s->pts != AV_NOPTS_VALUE)
|
|
s->pts += av_rescale_q(out->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
|
|
av_audio_fifo_drain(s->fifo, s->hop_size);
|
|
ret = ff_filter_frame(outlink, out);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
AudioSurroundContext *s = ctx->priv;
|
|
int ch;
|
|
|
|
av_frame_free(&s->input);
|
|
av_frame_free(&s->output);
|
|
av_frame_free(&s->overlap_buffer);
|
|
|
|
for (ch = 0; ch < s->nb_in_channels; ch++) {
|
|
av_rdft_end(s->rdft[ch]);
|
|
}
|
|
for (ch = 0; ch < s->nb_out_channels; ch++) {
|
|
av_rdft_end(s->irdft[ch]);
|
|
}
|
|
av_freep(&s->input_levels);
|
|
av_freep(&s->output_levels);
|
|
av_freep(&s->rdft);
|
|
av_freep(&s->irdft);
|
|
av_audio_fifo_free(s->fifo);
|
|
av_freep(&s->window_func_lut);
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(AudioSurroundContext, x)
|
|
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
|
|
|
|
static const AVOption surround_options[] = {
|
|
{ "chl_out", "set output channel layout", OFFSET(out_channel_layout_str), AV_OPT_TYPE_STRING, {.str="5.1"}, 0, 0, FLAGS },
|
|
{ "chl_in", "set input channel layout", OFFSET(in_channel_layout_str), AV_OPT_TYPE_STRING, {.str="stereo"},0, 0, FLAGS },
|
|
{ "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
|
|
{ "level_out", "set output level", OFFSET(level_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
|
|
{ "lfe", "output LFE", OFFSET(output_lfe), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
|
|
{ "lfe_low", "LFE low cut off", OFFSET(lowcutf), AV_OPT_TYPE_INT, {.i64=128}, 0, 256, FLAGS },
|
|
{ "lfe_high", "LFE high cut off", OFFSET(highcutf), AV_OPT_TYPE_INT, {.i64=256}, 0, 512, FLAGS },
|
|
{ "fc_in", "set front center channel input level", OFFSET(fc_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
|
|
{ "fc_out", "set front center channel output level", OFFSET(fc_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
|
|
{ "lfe_in", "set lfe channel input level", OFFSET(lfe_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
|
|
{ "lfe_out", "set lfe channel output level", OFFSET(lfe_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(surround);
|
|
|
|
static const AVFilterPad inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.filter_frame = filter_frame,
|
|
.config_props = config_input,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_output,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_af_surround = {
|
|
.name = "surround",
|
|
.description = NULL_IF_CONFIG_SMALL("Apply audio surround upmix filter."),
|
|
.query_formats = query_formats,
|
|
.priv_size = sizeof(AudioSurroundContext),
|
|
.priv_class = &surround_class,
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.inputs = inputs,
|
|
.outputs = outputs,
|
|
.flags = AVFILTER_FLAG_SLICE_THREADS,
|
|
};
|