diff options
author | Paul B Mahol <onemda@gmail.com> | 2015-12-09 15:40:03 +0300 |
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committer | Paul B Mahol <onemda@gmail.com> | 2015-12-12 22:56:36 +0300 |
commit | 0a19538bcf401afd369a597fe1fa06172368e46f (patch) | |
tree | 7ca44edab499ab67a3a9584d945a7bb440eaa710 /libavfilter/af_sofalizer.c | |
parent | 69e80d6ce42c6b1a19f6cc79d68cedd91111cc37 (diff) |
avfilter: add SOFAlizer audio filter
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'libavfilter/af_sofalizer.c')
-rw-r--r-- | libavfilter/af_sofalizer.c | 1018 |
1 files changed, 1018 insertions, 0 deletions
diff --git a/libavfilter/af_sofalizer.c b/libavfilter/af_sofalizer.c new file mode 100644 index 0000000000..b81521c3b0 --- /dev/null +++ b/libavfilter/af_sofalizer.c @@ -0,0 +1,1018 @@ +/***************************************************************************** + * sofalizer.c : SOFAlizer filter for virtual binaural acoustics + ***************************************************************************** + * Copyright (C) 2013-2015 Andreas Fuchs, Wolfgang Hrauda, + * Acoustics Research Institute (ARI), Vienna, Austria + * + * Authors: Andreas Fuchs <andi.fuchs.mail@gmail.com> + * Wolfgang Hrauda <wolfgang.hrauda@gmx.at> + * + * SOFAlizer project coordinator at ARI, main developer of SOFA: + * Piotr Majdak <piotr@majdak.at> + * + * This program 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. + * + * This program 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 this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. + *****************************************************************************/ + +#include <math.h> +#include <netcdf.h> + +#include "libavutil/float_dsp.h" +#include "libavutil/opt.h" +#include "avfilter.h" +#include "internal.h" +#include "audio.h" + +typedef struct NCSofa { /* contains data of one SOFA file */ + int ncid; /* netCDF ID of the opened SOFA file */ + int n_samples; /* length of one impulse response (IR) */ + int m_dim; /* number of measurement positions */ + int *data_delay; /* broadband delay of each IR */ + /* all measurement positions for each receiver (i.e. ear): */ + float *sp_a; /* azimuth angles */ + float *sp_e; /* elevation angles */ + float *sp_r; /* radii */ + /* data at each measurement position for each receiver: */ + float *data_ir; /* IRs (time-domain) */ +} NCSofa; + +typedef struct SOFAlizerContext { + const AVClass *class; + + char *filename; /* name of SOFA file */ + NCSofa sofa; /* contains data of the SOFA file */ + + const int8_t *reorder; /* reorder in SOFA channel order */ + int sample_rate; /* sample rate from SOFA file */ + float *speaker_pos; /* positions of the virtual loudspekaers */ + float gain_lfe; /* gain applied to LFE channel */ + + int n_conv; /* number of channels to convolute */ + + /* buffer variables (for convolution) */ + float *ringbuffer[2]; /* buffers input samples, length of one buffer: */ + /* no. input ch. (incl. LFE) x buffer_length */ + int write[2]; /* current write position to ringbuffer */ + int buffer_length; /* is: longest IR plus max. delay in all SOFA files */ + /* then choose next power of 2 */ + + /* netCDF variables */ + int *delay[2]; /* broadband delay for each channel/IR to be convolved */ + + float *data_ir[2]; /* IRs for all channels to be convolved */ + /* (this excludes the LFE) */ + float *temp_src[2]; + + /* control variables */ + float gain; /* filter gain (in dB) */ + float rotation; /* rotation of virtual loudspeakers (in degrees) */ + float elevation; /* elevation of virtual loudspeakers (in deg.) */ + float radius; /* distance virtual loudspeakers to listener (in metres) */ + + int lfe; /* whether or not the LFE channel is used */ + + AVFloatDSPContext *fdsp; +} SOFAlizerContext; + +static int close_sofa(struct NCSofa *sofa) +{ + av_freep(&sofa->data_delay); + av_freep(&sofa->sp_a); + av_freep(&sofa->sp_e); + av_freep(&sofa->sp_r); + av_freep(&sofa->data_ir); + nc_close(sofa->ncid); + sofa->ncid = 0; + + return 0; +} + +static int load_sofa(AVFilterContext *ctx, char *filename, int *samplingrate) +{ + struct SOFAlizerContext *s = ctx->priv; + /* variables associated with content of SOFA file: */ + int ncid, n_dims, n_vars, n_gatts, n_unlim_dim_id, status; + char data_delay_dim_name[NC_MAX_NAME]; + float *sp_a, *sp_e, *sp_r, *data_ir; + char *sofa_conventions; + char dim_name[NC_MAX_NAME]; /* names of netCDF dimensions */ + size_t *dim_length; /* lengths of netCDF dimensions */ + char *psz_conventions; + unsigned int sample_rate; + int data_delay_dim_id[2]; + int samplingrate_id; + int data_delay_id; + int n_samples; + int m_dim_id = -1; + int n_dim_id = -1; + int data_ir_id; + size_t att_len; + int m_dim; + int *data_delay; + int sp_id; + int i, ret; + + s->sofa.ncid = 0; + status = nc_open(filename, NC_NOWRITE, &ncid); /* open SOFA file read-only */ + if (status != NC_NOERR) { + av_log(ctx, AV_LOG_ERROR, "Can't find SOFA-file '%s'\n", filename); + return AVERROR(EINVAL); + } + + /* get number of dimensions, vars, global attributes and Id of unlimited dimensions: */ + nc_inq(ncid, &n_dims, &n_vars, &n_gatts, &n_unlim_dim_id); + + /* -- get number of measurements ("M") and length of one IR ("N") -- */ + dim_length = av_malloc_array(n_dims, sizeof(*dim_length)); + if (!dim_length) { + nc_close(ncid); + return AVERROR(ENOMEM); + } + + for (i = 0; i < n_dims; i++) { /* go through all dimensions of file */ + nc_inq_dim(ncid, i, (char *)&dim_name, &dim_length[i]); /* get dimensions */ + if (!strncmp("M", (const char *)&dim_name, 1)) /* get ID of dimension "M" */ + m_dim_id = i; + if (!strncmp("N", (const char *)&dim_name, 1)) /* get ID of dimension "N" */ + n_dim_id = i; + } + + if ((m_dim_id == -1) || (n_dim_id == -1)) { /* dimension "M" or "N" couldn't be found */ + av_log(ctx, AV_LOG_ERROR, "Can't find required dimensions in SOFA file.\n"); + av_freep(&dim_length); + nc_close(ncid); + return AVERROR(EINVAL); + } + + n_samples = dim_length[n_dim_id]; /* get number of measurements */ + m_dim = dim_length[m_dim_id]; /* get length of one IR */ + + av_freep(&dim_length); + + /* -- check file type -- */ + /* get length of attritube "Conventions" */ + status = nc_inq_attlen(ncid, NC_GLOBAL, "Conventions", &att_len); + if (status != NC_NOERR) { + av_log(ctx, AV_LOG_ERROR, "Can't get length of attribute \"Conventions\".\n"); + nc_close(ncid); + return AVERROR_INVALIDDATA; + } + + /* check whether file is SOFA file */ + psz_conventions = av_malloc(att_len + 1); + if (!psz_conventions) { + nc_close(ncid); + return AVERROR(ENOMEM); + } + + nc_get_att_text(ncid, NC_GLOBAL, "Conventions", psz_conventions); + *(psz_conventions + att_len) = 0; + if (strncmp("SOFA", psz_conventions, 4)) { + av_log(ctx, AV_LOG_ERROR, "Not a SOFA file!\n"); + av_freep(&psz_conventions); + nc_close(ncid); + return AVERROR(EINVAL); + } + av_freep(&psz_conventions); + + status = nc_inq_attlen(ncid, NC_GLOBAL, "SOFAConventions", &att_len); + if (status != NC_NOERR) { + av_log(ctx, AV_LOG_ERROR, "Can't get length of attribute \"SOFAConventions\".\n"); + nc_close(ncid); + return AVERROR_INVALIDDATA; + } + + sofa_conventions = av_malloc(att_len + 1); + if (!sofa_conventions) { + nc_close(ncid); + return AVERROR(ENOMEM); + } + + nc_get_att_text(ncid, NC_GLOBAL, "SOFAConventions", sofa_conventions); + *(sofa_conventions + att_len) = 0; + if (strncmp("SimpleFreeFieldHRIR", sofa_conventions, att_len)) { + av_log(ctx, AV_LOG_ERROR, "Not a SimpleFreeFieldHRIR file!\n"); + av_freep(&sofa_conventions); + nc_close(ncid); + return AVERROR(EINVAL); + } + av_freep(&sofa_conventions); + + /* -- get sampling rate of HRTFs -- */ + /* read ID, then value */ + status = nc_inq_varid(ncid, "Data.SamplingRate", &samplingrate_id); + status += nc_get_var_uint(ncid, samplingrate_id, &sample_rate); + if (status != NC_NOERR) { + av_log(ctx, AV_LOG_ERROR, "Couldn't read Data.SamplingRate.\n"); + nc_close(ncid); + return AVERROR(EINVAL); + } + *samplingrate = sample_rate; /* remember sampling rate */ + + /* -- allocate memory for one value for each measurement position: -- */ + sp_a = s->sofa.sp_a = av_malloc_array(m_dim, sizeof(float)); + sp_e = s->sofa.sp_e = av_malloc_array(m_dim, sizeof(float)); + sp_r = s->sofa.sp_r = av_malloc_array(m_dim, sizeof(float)); + /* delay and IR values required for each ear and measurement position: */ + data_delay = s->sofa.data_delay = av_calloc(m_dim, 2 * sizeof(int)); + data_ir = s->sofa.data_ir = av_malloc_array(m_dim * n_samples, sizeof(float) * 2); + s->temp_src[0] = av_calloc(FFALIGN(n_samples, 16), sizeof(float)); + s->temp_src[1] = av_calloc(FFALIGN(n_samples, 16), sizeof(float)); + + if (!data_delay || !sp_a || !sp_e || !sp_r || !data_ir || + !s->temp_src[0] || !s->temp_src[1]) { + /* if memory could not be allocated */ + close_sofa(&s->sofa); + return AVERROR(ENOMEM); + } + + /* get impulse responses (HRTFs): */ + /* get corresponding ID */ + status = nc_inq_varid(ncid, "Data.IR", &data_ir_id); + status += nc_get_var_float(ncid, data_ir_id, data_ir); /* read and store IRs */ + if (status != NC_NOERR) { + av_log(ctx, AV_LOG_ERROR, "Couldn't read Data.IR!\n"); + ret = AVERROR(EINVAL); + goto error; + } + + /* get source positions of the HRTFs in the SOFA file: */ + status = nc_inq_varid(ncid, "SourcePosition", &sp_id); /* get corresponding ID */ + status += nc_get_vara_float(ncid, sp_id, (size_t[2]){ 0, 0 } , + (size_t[2]){ m_dim, 1}, sp_a); /* read & store azimuth angles */ + status += nc_get_vara_float(ncid, sp_id, (size_t[2]){ 0, 1 } , + (size_t[2]){ m_dim, 1}, sp_e); /* read & store elevation angles */ + status += nc_get_vara_float(ncid, sp_id, (size_t[2]){ 0, 2 } , + (size_t[2]){ m_dim, 1}, sp_r); /* read & store radii */ + if (status != NC_NOERR) { /* if any source position variable coudn't be read */ + av_log(ctx, AV_LOG_ERROR, "Couldn't read SourcePosition.\n"); + ret = AVERROR(EINVAL); + goto error; + } + + /* read Data.Delay, check for errors and fit it to data_delay */ + status = nc_inq_varid(ncid, "Data.Delay", &data_delay_id); + status += nc_inq_vardimid(ncid, data_delay_id, &data_delay_dim_id[0]); + status += nc_inq_dimname(ncid, data_delay_dim_id[0], data_delay_dim_name); + if (status != NC_NOERR) { + av_log(ctx, AV_LOG_ERROR, "Couldn't read Data.Delay.\n"); + ret = AVERROR(EINVAL); + goto error; + } + + /* Data.Delay dimension check */ + /* dimension of Data.Delay is [I R]: */ + if (!strncmp(data_delay_dim_name, "I", 2)) { + /* check 2 characters to assure string is 0-terminated after "I" */ + int delay[2]; /* delays get from SOFA file: */ + + av_log(ctx, AV_LOG_DEBUG, "Data.Delay has dimension [I R]\n"); + status = nc_get_var_int(ncid, data_delay_id, &delay[0]); + if (status != NC_NOERR) { + av_log(ctx, AV_LOG_ERROR, "Couldn't read Data.Delay\n"); + ret = AVERROR(EINVAL); + goto error; + } + int *data_delay_r = data_delay + m_dim; + for (i = 0; i < m_dim; i++) { /* extend given dimension [I R] to [M R] */ + /* assign constant delay value for all measurements to data_delay fields */ + data_delay[i] = delay[0]; + data_delay_r[i] = delay[1]; + } + /* dimension of Data.Delay is [M R] */ + } else if (!strncmp(data_delay_dim_name, "M", 2)) { + av_log(ctx, AV_LOG_ERROR, "Data.Delay in dimension [M R]\n"); + /* get delays from SOFA file: */ + status = nc_get_var_int(ncid, data_delay_id, data_delay); + if (status != NC_NOERR) { + av_log(ctx, AV_LOG_ERROR, "Couldn't read Data.Delay\n"); + ret = AVERROR(EINVAL); + goto error; + } + } else { /* dimension of Data.Delay is neither [I R] nor [M R] */ + av_log(ctx, AV_LOG_ERROR, "Data.Delay does not have the required dimensions [I R] or [M R].\n"); + ret = AVERROR(EINVAL); + goto error; + } + + /* save information in SOFA struct: */ + s->sofa.m_dim = m_dim; /* no. measurement positions */ + s->sofa.n_samples = n_samples; /* length on one IR */ + s->sofa.ncid = ncid; /* netCDF ID of SOFA file */ + nc_close(ncid); /* close SOFA file */ + + return 0; + +error: + close_sofa(&s->sofa); + return ret; +} + +static const int8_t reorder[18][9] = { + { 0, -1, -1, -1, -1, -1, -1, -1, -1 }, + { 0, 1, -1, -1, -1, -1, -1, -1, -1 }, + { 0, 1, 2, -1, -1, -1, -1, -1, -1 }, + { 0, 1, 2, -1, -1, -1, -1, -1, -1 }, + { 0, 1, 2, 3, -1, -1, -1, -1, -1 }, + { 0, 1, 2, 3, -1, -1, -1, -1, -1 }, + { 0, 1, 2, 3, -1, -1, -1, -1, -1 }, + { 0, 1, 3, 4, 2, -1, -1, -1, -1 }, + { 0, 1, 3, 4, 2, -1, -1, -1, -1 }, + { 0, 1, 4, 5, 2, 3, -1, -1, -1 }, + { 0, 1, 4, 5, 2, 3, -1, -1, -1 }, + { 0, 1, 5, 6, 4, 2, 3, -1, -1 }, + { 0, 1, 5, 6, 3, 4, 2, -1, -1 }, + { 0, 1, 6, 7, 4, 5, 2, 3, -1 }, + { 0, 1, 2, 3, 4, 5, 6, 7, 8 }, + { 0, 1, 2, 3, 4, 5, 6, 7, -1 }, + { 0, 1, 3, 4, 2, 5, -1, -1, -1 }, + { 0, 1, 4, 5, 2, 6, 3, -1, -1 }, +}; + +static int get_speaker_pos(AVFilterContext *ctx, float *speaker_pos) +{ + struct SOFAlizerContext *s = ctx->priv; + uint64_t channels_layout = ctx->inputs[0]->channel_layout; + float pos_temp[9]; + int nb_input_channels = ctx->inputs[0]->channels; /* get no. input channels */ + int n_conv = nb_input_channels; + + if (channels_layout & AV_CH_LOW_FREQUENCY) { /* if LFE is used */ + /* decrease number of channels to be convolved: */ + n_conv = nb_input_channels - 1; + } + + /* set speaker positions according to input channel configuration: */ + switch (channels_layout) { + case AV_CH_LAYOUT_MONO: + pos_temp[0] = 0; + break; + case AV_CH_LAYOUT_STEREO: + case AV_CH_LAYOUT_2POINT1: + pos_temp[0] = 30; + pos_temp[1] = 330; + break; + case AV_CH_LAYOUT_SURROUND: + case AV_CH_LAYOUT_3POINT1: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 0; + break; + case AV_CH_LAYOUT_2_1: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 180; + break; + case AV_CH_LAYOUT_2_2: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 90; + pos_temp[3] = 270; + break; + case AV_CH_LAYOUT_QUAD: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 120; + pos_temp[3] = 240; + break; + case AV_CH_LAYOUT_4POINT0: + case AV_CH_LAYOUT_4POINT1: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 0; + pos_temp[3] = 180; + break; + case AV_CH_LAYOUT_5POINT0: + case AV_CH_LAYOUT_5POINT1: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 90; + pos_temp[3] = 270; + pos_temp[4] = 0; + break; + case AV_CH_LAYOUT_5POINT0_BACK: + case AV_CH_LAYOUT_5POINT1_BACK: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 120; + pos_temp[3] = 240; + pos_temp[4] = 0; + break; + case AV_CH_LAYOUT_6POINT0: + case AV_CH_LAYOUT_6POINT1: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 90; + pos_temp[3] = 270; + pos_temp[4] = 0; + pos_temp[5] = 180; + break; + case AV_CH_LAYOUT_6POINT1_BACK: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 120; + pos_temp[3] = 240; + pos_temp[4] = 0; + pos_temp[4] = 180; + break; + case AV_CH_LAYOUT_HEXAGONAL: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 120; + pos_temp[3] = 240; + pos_temp[4] = 0; + pos_temp[5] = 180; + break; + case AV_CH_LAYOUT_7POINT0: + case AV_CH_LAYOUT_7POINT1: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 90; + pos_temp[3] = 270; + pos_temp[4] = 150; + pos_temp[5] = 210; + pos_temp[6] = 0; + break; + case AV_CH_LAYOUT_OCTAGONAL: + pos_temp[0] = 30; + pos_temp[1] = 330; + pos_temp[2] = 0; + pos_temp[3] = 150; + pos_temp[4] = 210; + pos_temp[5] = 180; + pos_temp[6] = 90; + pos_temp[7] = 270; + break; + default: + return -1; + } + + switch (channels_layout) { + case AV_CH_LAYOUT_MONO: + s->reorder = reorder[0]; + break; + case AV_CH_LAYOUT_STEREO: + s->reorder = reorder[1]; + break; + case AV_CH_LAYOUT_2_1: + case AV_CH_LAYOUT_2POINT1: + s->reorder = reorder[2]; + break; + case AV_CH_LAYOUT_SURROUND: + s->reorder = reorder[3]; + break; + case AV_CH_LAYOUT_3POINT1: + case AV_CH_LAYOUT_2_2: + s->reorder = reorder[4]; + break; + case AV_CH_LAYOUT_QUAD: + s->reorder = reorder[5]; + break; + case AV_CH_LAYOUT_4POINT0: + s->reorder = reorder[6]; + break; + case AV_CH_LAYOUT_4POINT1: + s->reorder = reorder[7]; + break; + case AV_CH_LAYOUT_5POINT0: + case AV_CH_LAYOUT_5POINT0_BACK: + s->reorder = reorder[8]; + break; + case AV_CH_LAYOUT_5POINT1: + case AV_CH_LAYOUT_5POINT1_BACK: + s->reorder = reorder[9]; + break; + case AV_CH_LAYOUT_6POINT0: + s->reorder = reorder[10]; + break; + case AV_CH_LAYOUT_HEXAGONAL: + s->reorder = reorder[16]; + break; + case AV_CH_LAYOUT_6POINT1: + s->reorder = reorder[11]; + break; + case AV_CH_LAYOUT_6POINT1_BACK: + s->reorder = reorder[17]; + break; + case AV_CH_LAYOUT_7POINT0: + s->reorder = reorder[12]; + break; + case AV_CH_LAYOUT_7POINT1: + s->reorder = reorder[13]; + break; + case AV_CH_LAYOUT_OCTAGONAL: + s->reorder = reorder[15]; + break; + default: + return -1; + } + + memcpy(speaker_pos, pos_temp, n_conv * sizeof(float)); + + return 0; + +} + +static int max_delay(struct NCSofa *sofa) +{ + int i, max = 0; + + for (i = 0; i < sofa->m_dim * 2; i++) { + /* search maximum delay in given SOFA file */ + max = FFMAX(max, sofa->data_delay[i]); + } + + return max; +} + +static int find_m(SOFAlizerContext *s, int azim, int elev, float radius) +{ + /* get source positions and M of currently selected SOFA file */ + float *sp_a = s->sofa.sp_a; /* azimuth angle */ + float *sp_e = s->sofa.sp_e; /* elevation angle */ + float *sp_r = s->sofa.sp_r; /* radius */ + int m_dim = s->sofa.m_dim; /* no. measurements */ + int best_id = 0; /* index m currently closest to desired source pos. */ + float delta = 1000; /* offset between desired and currently best pos. */ + float current; + int i; + + for (i = 0; i < m_dim; i++) { + /* search through all measurements in currently selected SOFA file */ + /* distance of current to desired source position: */ + current = fabs(sp_a[i] - azim) + + fabs(sp_e[i] - elev) + + fabs(sp_r[i] - radius); + if (current <= delta) { + /* if current distance is smaller than smallest distance so far */ + delta = current; + best_id = i; /* remember index */ + } + } + + return best_id; +} + +static int compensate_volume(AVFilterContext *ctx) +{ + struct SOFAlizerContext *s = ctx->priv; + float compensate; + float energy = 0; + float *ir; + int m, j; + + if (s->sofa.ncid) { + /* find IR at front center position in the SOFA file (IR closest to 0°,0°,1m) */ + struct NCSofa *sofa = &s->sofa; + m = find_m(s, 0, 0, 1); + /* get energy of that IR and compensate volume */ + ir = sofa->data_ir + 2 * m * sofa->n_samples; + for (j = 0; j < sofa->n_samples; j++) { + energy += *(ir + j) * *(ir + j); + } + compensate = 256 / (sofa->n_samples * sqrt(energy)); + av_log(ctx, AV_LOG_DEBUG, "Compensate-factor: %f\n", compensate); + ir = sofa->data_ir; + for (j = 0; j < sofa->n_samples * sofa->m_dim * 2; j++) { + ir[j] *= compensate; /* apply volume compensation to IRs */ + } + } + + return 0; +} + +typedef struct ThreadData { + AVFrame *in, *out; + int *write; + int **delay; + float **ir; + int *n_clippings; + float **ringbuffer; + float **temp_src; +} ThreadData; + +static int sofalizer_convolute(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) +{ + SOFAlizerContext *s = ctx->priv; + ThreadData *td = arg; + AVFrame *in = td->in, *out = td->out; + int offset = jobnr; + int *write = &td->write[jobnr]; + const int *const delay = td->delay[jobnr]; + const float *const ir = td->ir[jobnr]; + int *n_clippings = &td->n_clippings[jobnr]; + float *ringbuffer = td->ringbuffer[jobnr]; + float *temp_src = td->temp_src[jobnr]; + const int n_samples = s->sofa.n_samples; /* length of one IR */ + const float *src = (const float *)in->data[0]; /* get pointer to audio input buffer */ + float *dst = (float *)out->data[0]; /* get pointer to audio output buffer */ + int in_channels = in->channels; /* number of input channels */ + /* ring buffer length is: longest IR plus max. delay -> next power of 2 */ + int buffer_length = s->buffer_length; + /* -1 for AND instead of MODULO (applied to powers of 2): */ + uint32_t modulo = (uint32_t)buffer_length - 1; + float *buffer[10]; /* holds ringbuffer for each input channel */ + int wr = *write; + int read; + int i, j, l; + + dst += offset; + for (l = 0; l < in_channels; l++) { + /* get starting address of ringbuffer for each input channel */ + buffer[l] = ringbuffer + l * buffer_length; + } + + for (i = 0; i < in->nb_samples; i++) { + const float *temp_ir = ir; /* using same set of IRs for each sample */ + + *dst = 0; + for (l = 0; l < in_channels; l++) { + /* write current input sample to ringbuffer (for each channel) */ + *(buffer[l] + wr) = src[s->reorder[l]]; + } + + /* loop goes through all channels to be convolved (excl. LFE): */ + for (l = 0; l < s->n_conv; l++) { + const float *const bptr = buffer[l]; + + /* current read position in ringbuffer: input sample write position + * - delay for l-th ch. + diff. betw. IR length and buffer length + * (mod buffer length) */ + read = (wr - *(delay + l) - (n_samples - 1) + buffer_length) & modulo; + + for (j = 0; j < n_samples; j++) + temp_src[j] = bptr[(read + j) & modulo]; + + /* multiply signal and IR, and add up the results */ + dst[0] += s->fdsp->scalarproduct_float(temp_ir, temp_src, n_samples); + temp_ir += n_samples; + } + + if (s->lfe) { /* LFE */ + /* apply gain to LFE signal and add to output buffer */ + *dst += *(buffer[s->n_conv] + wr) * s->gain_lfe; + } + + /* clippings counter */ + if (fabs(*dst) > 1) + *n_clippings += 1; + + /* move output buffer pointer by +2 to get to next sample of processed channel: */ + dst += 2; + src += in_channels; + wr = (wr + 1) & modulo; /* update ringbuffer write position */ + } + + *write = wr; /* remember write position in ringbuffer for next call */ + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + AVFilterContext *ctx = inlink->dst; + SOFAlizerContext *s = ctx->priv; + AVFilterLink *outlink = ctx->outputs[0]; + int n_clippings[2] = { 0 }; + ThreadData td; + AVFrame *out; + + out = ff_get_audio_buffer(outlink, in->nb_samples); + if (!out) { + av_frame_free(&in); + return AVERROR(ENOMEM); + } + av_frame_copy_props(out, in); + + td.in = in; td.out = out; td.write = s->write; + td.delay = s->delay; td.ir = s->data_ir; td.n_clippings = n_clippings; + td.ringbuffer = s->ringbuffer; td.temp_src = s->temp_src; + + ctx->internal->execute(ctx, sofalizer_convolute, &td, NULL, 2); + emms_c(); + + /* display error message if clipping occured */ + if (n_clippings[0] + n_clippings[1] > 0) { + av_log(ctx, AV_LOG_WARNING, "%d of %d samples clipped. Please reduce gain.\n", + n_clippings[0] + n_clippings[1], out->nb_samples * 2); + } + + av_frame_free(&in); + return ff_filter_frame(outlink, out); +} + +static int query_formats(AVFilterContext *ctx) +{ + struct SOFAlizerContext *s = ctx->priv; + AVFilterFormats *formats = NULL; + AVFilterChannelLayouts *layouts = NULL; + int ret, sample_rates[] = { 48000, -1 }; + static const uint64_t channel_layouts[] = { AV_CH_LAYOUT_MONO, + AV_CH_LAYOUT_STEREO, + AV_CH_LAYOUT_2POINT1, + AV_CH_LAYOUT_SURROUND, + AV_CH_LAYOUT_2_1, + AV_CH_LAYOUT_4POINT0, + AV_CH_LAYOUT_QUAD, + AV_CH_LAYOUT_2_2, + AV_CH_LAYOUT_3POINT1, + AV_CH_LAYOUT_5POINT0_BACK, + AV_CH_LAYOUT_5POINT0, + AV_CH_LAYOUT_4POINT1, + AV_CH_LAYOUT_5POINT1_BACK, + AV_CH_LAYOUT_5POINT1, + AV_CH_LAYOUT_6POINT0, + AV_CH_LAYOUT_HEXAGONAL, + AV_CH_LAYOUT_6POINT1, + AV_CH_LAYOUT_6POINT1_BACK, + AV_CH_LAYOUT_7POINT0, + AV_CH_LAYOUT_7POINT1, + AV_CH_LAYOUT_OCTAGONAL, + 0, }; + + ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLT); + if (ret) + return ret; + ret = ff_set_common_formats(ctx, formats); + if (ret) + return ret; + + layouts = ff_make_formatu64_list(channel_layouts); + if (!layouts) + return AVERROR(ENOMEM); + + ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->out_channel_layouts); + if (ret) + return ret; + + layouts = NULL; + ret = ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO); + if (ret) + return ret; + + ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts); + if (ret) + return ret; + + sample_rates[0] = s->sample_rate; + formats = ff_make_format_list(sample_rates); + if (!formats) + return AVERROR(ENOMEM); + return ff_set_common_samplerates(ctx, formats); +} + +static int load_data(AVFilterContext *ctx, int azim, int elev, float radius) +{ + struct SOFAlizerContext *s = ctx->priv; + const int n_samples = s->sofa.n_samples; + int n_conv = s->n_conv; /* no. channels to convolve (excl. LFE) */ + int delay_l[10]; /* broadband delay for each IR */ + int delay_r[10]; + int nb_input_channels = ctx->inputs[0]->channels; /* no. input channels */ + float gain_lin = expf((s->gain - 3 * nb_input_channels) / 20 * M_LN10); /* gain - 3dB/channel */ + float *data_ir_l = NULL; + float *data_ir_r = NULL; + int offset = 0; /* used for faster pointer arithmetics in for-loop */ + int m[s->n_conv]; /* measurement index m of IR closest to required source positions */ + int i, j, azim_orig = azim; + + if (!s->sofa.ncid) { /* if an invalid SOFA file has been selected */ + av_log(ctx, AV_LOG_ERROR, "Selected SOFA file is invalid. Please select valid SOFA file.\n"); + return AVERROR_INVALIDDATA; + } + + /* get temporary IR for L and R channel */ + data_ir_l = av_malloc_array(n_conv * n_samples, sizeof(*data_ir_l)); + data_ir_r = av_malloc_array(n_conv * n_samples, sizeof(*data_ir_r)); + if (!data_ir_r || !data_ir_l) { + av_free(data_ir_l); + av_free(data_ir_r); + return AVERROR(ENOMEM); + } + + for (i = 0; i < s->n_conv; i++) { + /* load and store IRs and corresponding delays */ + azim = (int)(s->speaker_pos[i] + azim_orig) % 360; + /* get id of IR closest to desired position */ + m[i] = find_m(s, azim, elev, radius); + + /* load the delays associated with the current IRs */ + delay_l[i] = *(s->sofa.data_delay + 2 * m[i]); + delay_r[i] = *(s->sofa.data_delay + 2 * m[i] + 1); + + offset = i * n_samples; /* no. samples already written */ + for (j = 0; j < n_samples; j++) { + /* load reversed IRs of the specified source position + * sample-by-sample for left and right ear; and apply gain */ + *(data_ir_l + offset + j) = /* left channel */ + *(s->sofa.data_ir + 2 * m[i] * n_samples + n_samples - 1 - j) * gain_lin; + *(data_ir_r + offset + j) = /* right channel */ + *(s->sofa.data_ir + 2 * m[i] * n_samples + n_samples - 1 - j + n_samples) * gain_lin; + } + + av_log(ctx, AV_LOG_DEBUG, "Index: %d, Azimuth: %f, Elevation: %f, Radius: %f of SOFA file.\n", + m[i], *(s->sofa.sp_a + m[i]), *(s->sofa.sp_e + m[i]), *(s->sofa.sp_r + m[i])); + } + + /* copy IRs and delays to allocated memory in the SOFAlizerContext struct: */ + memcpy(s->data_ir[0], data_ir_l, sizeof(float) * n_conv * n_samples); + memcpy(s->data_ir[1], data_ir_r, sizeof(float) * n_conv * n_samples); + + av_free(data_ir_l); /* free temporary IR memory */ + av_free(data_ir_r); + + memcpy(s->delay[0], &delay_l[0], sizeof(int) * s->n_conv); + memcpy(s->delay[1], &delay_r[0], sizeof(int) * s->n_conv); + + return 0; +} + +static av_cold int init(AVFilterContext *ctx) +{ + SOFAlizerContext *s = ctx->priv; + int ret; + + /* load SOFA file, */ + /* initialize file IDs to 0 before attempting to load SOFA files, + * this assures that in case of error, only the memory of already + * loaded files is free'd */ + s->sofa.ncid = 0; + ret = load_sofa(ctx, s->filename, &s->sample_rate); + if (ret) { + /* file loading error */ + av_log(ctx, AV_LOG_ERROR, "Error while loading SOFA file: '%s'\n", s->filename); + } else { /* no file loading error, resampling not required */ + av_log(ctx, AV_LOG_DEBUG, "File '%s' loaded.\n", s->filename); + } + + if (ret) { + av_log(ctx, AV_LOG_ERROR, "No valid SOFA file could be loaded. Please specify valid SOFA file.\n"); + return ret; + } + + s->fdsp = avpriv_float_dsp_alloc(0); + if (!s->fdsp) + return AVERROR(ENOMEM); + + return 0; +} + +static inline unsigned clz(unsigned x) +{ + unsigned i = sizeof(x) * 8; + + while (x) { + x >>= 1; + i--; + } + + return i; +} + +static int config_input(AVFilterLink *inlink) +{ + AVFilterContext *ctx = inlink->dst; + SOFAlizerContext *s = ctx->priv; + int nb_input_channels = inlink->channels; /* no. input channels */ + int n_max_ir = 0; + int n_current; + int n_max = 0; + int ret; + + /* gain -3 dB per channel, -6 dB to get LFE on a similar level */ + s->gain_lfe = expf((s->gain - 3 * inlink->channels - 6) / 20 * M_LN10); + + s->lfe = !!(inlink->channel_layout & AV_CH_LOW_FREQUENCY); + /* LFE is an input channel but requires no convolution */ + s->n_conv = nb_input_channels - s->lfe; + + /* get size of ringbuffer (longest IR plus max. delay) */ + /* then choose next power of 2 for performance optimization */ + n_current = s->sofa.n_samples + max_delay(&s->sofa); + if (n_current > n_max) { + /* length of longest IR plus max. delay (in all SOFA files) */ + n_max = n_current; + /* length of longest IR (without delay, in all SOFA files) */ + n_max_ir = s->sofa.n_samples; + } + /* buffer length is longest IR plus max. delay -> next power of 2 + (32 - count leading zeros gives required exponent) */ + s->buffer_length = exp2(32 - clz((uint32_t)n_max)); + + /* Allocate memory for the impulse responses, delays and the ringbuffers */ + /* size: (longest IR) * (number of channels to convolute), without LFE */ + s->data_ir[0] = av_malloc_array(n_max_ir, sizeof(float) * s->n_conv); + s->data_ir[1] = av_malloc_array(n_max_ir, sizeof(float) * s->n_conv); + /* length: number of channels to convolute */ + s->delay[0] = av_malloc_array(s->n_conv, sizeof(float)); + s->delay[1] = av_malloc_array(s->n_conv, sizeof(float)); + /* length: (buffer length) * (number of input channels), + * OR: buffer length (if frequency domain processing) + * calloc zero-initializes the buffer */ + s->ringbuffer[0] = av_calloc(s->buffer_length, sizeof(float) * nb_input_channels); + s->ringbuffer[1] = av_calloc(s->buffer_length, sizeof(float) * nb_input_channels); + /* length: number of channels to convolute */ + s->speaker_pos = av_malloc_array(s->n_conv, sizeof(*s->speaker_pos)); + + /* memory allocation failed: */ + if (!s->data_ir[0] || !s->data_ir[1] || !s->delay[1] || + !s->delay[0] || !s->ringbuffer[0] || !s->ringbuffer[1] || + !s->speaker_pos) + return AVERROR(ENOMEM); + + compensate_volume(ctx); + + /* get speaker positions */ + if ((ret = get_speaker_pos(ctx, s->speaker_pos)) < 0) { + av_log(ctx, AV_LOG_ERROR, "Couldn't get speaker positions. Input channel configuration not supported.\n"); + return ret; + } + /* load IRs to data_ir[0] and data_ir[1] for required directions */ + /* only load IRs if time-domain convolution is used. */ + if ((ret = load_data(ctx, s->rotation, s->elevation, s->radius)) < 0) + return ret; + + av_log(ctx, AV_LOG_DEBUG, "Samplerate: %d Channels to convolute: %d, Length of ringbuffer: %d x %d\n", + inlink->sample_rate, s->n_conv, nb_input_channels, s->buffer_length); + + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + SOFAlizerContext *s = ctx->priv; + + if (s->sofa.ncid) { + av_freep(&s->sofa.sp_a); + av_freep(&s->sofa.sp_e); + av_freep(&s->sofa.sp_r); + av_freep(&s->sofa.data_delay); + av_freep(&s->sofa.data_ir); + } + av_freep(&s->delay[0]); + av_freep(&s->delay[1]); + av_freep(&s->data_ir[0]); + av_freep(&s->data_ir[1]); + av_freep(&s->ringbuffer[0]); + av_freep(&s->ringbuffer[1]); + av_freep(&s->speaker_pos); + av_freep(&s->temp_src[0]); + av_freep(&s->temp_src[1]); + av_freep(&s->fdsp); +} + +#define OFFSET(x) offsetof(SOFAlizerContext, x) +#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM + +static const AVOption sofalizer_options[] = { + { "sofa", "sofa filename", OFFSET(filename), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS }, + { "gain", "set gain in dB", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl=0}, -20, 40, .flags = FLAGS }, + { "rotation", "set rotation" , OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl=0}, -360, 360, .flags = FLAGS }, + { "elevation", "set elevation", OFFSET(elevation), AV_OPT_TYPE_FLOAT, {.dbl=0}, -90, 90, .flags = FLAGS }, + { "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 3, .flags = FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(sofalizer); + +static const AVFilterPad inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .config_props = config_input, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + }, + { NULL } +}; + +AVFilter ff_af_sofalizer = { + .name = "sofalizer", + .description = NULL_IF_CONFIG_SMALL("SOFAlizer (Spatially Oriented Format for Acoustics)."), + .priv_size = sizeof(SOFAlizerContext), + .priv_class = &sofalizer_class, + .init = init, + .uninit = uninit, + .query_formats = query_formats, + .inputs = inputs, + .outputs = outputs, + .flags = AVFILTER_FLAG_SLICE_THREADS, +}; |