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gstreamer/gst/audioconvert/gstchannelmix.c
Tim-Philipp Müller 5f59b4f7ee Fix FSF address 
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-03 23:05:09 +00:00

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/* GStreamer
* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.org>
*
* gstchannelmix.c: setup of channel conversion matrices
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include "gstchannelmix.h"
/*
* Channel matrix functions.
*/
void
gst_channel_mix_unset_matrix (AudioConvertCtx * this)
{
gint i;
/* don't access if nothing there */
if (!this->matrix)
return;
/* free */
for (i = 0; i < this->in.channels; i++)
g_free (this->matrix[i]);
g_free (this->matrix);
this->matrix = NULL;
g_free (this->tmp);
this->tmp = NULL;
}
/*
* Detect and fill in identical channels. E.g.
* forward the left/right front channels in a
* 5.1 to 2.0 conversion.
*/
static void
gst_channel_mix_fill_identical (AudioConvertCtx * this)
{
gint ci, co;
/* Apart from the compatible channel assignments, we can also have
* same channel assignments. This is much simpler, we simply copy
* the value from source to dest! */
for (co = 0; co < this->out.channels; co++) {
/* find a channel in input with same position */
for (ci = 0; ci < this->in.channels; ci++) {
if (this->in.position[ci] == this->out.position[co]) {
this->matrix[ci][co] = 1.0;
}
}
}
}
/*
* Detect and fill in compatible channels. E.g.
* forward left/right front to mono (or the other
* way around) when going from 2.0 to 1.0.
*/
static void
gst_channel_mix_fill_compatible (AudioConvertCtx * this)
{
/* Conversions from one-channel to compatible two-channel configs */
struct
{
GstAudioChannelPosition pos1[2];
GstAudioChannelPosition pos2[1];
} conv[] = {
/* front: mono <-> stereo */
{ {
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
GST_AUDIO_CHANNEL_POSITION_MONO}},
/* front center: 2 <-> 1 */
{ {
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, {
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}},
/* rear: 2 <-> 1 */
{ {
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}}, { {
GST_AUDIO_CHANNEL_POSITION_INVALID}}
};
gint c;
/* conversions from compatible (but not the same) channel schemes */
for (c = 0; conv[c].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; c++) {
gint pos1_0 = -1, pos1_1 = -1, pos1_2 = -1;
gint pos2_0 = -1, pos2_1 = -1, pos2_2 = -1;
gint n;
for (n = 0; n < this->in.channels; n++) {
if (this->in.position[n] == conv[c].pos1[0])
pos1_0 = n;
else if (this->in.position[n] == conv[c].pos1[1])
pos1_1 = n;
else if (this->in.position[n] == conv[c].pos2[0])
pos1_2 = n;
}
for (n = 0; n < this->out.channels; n++) {
if (this->out.position[n] == conv[c].pos1[0])
pos2_0 = n;
else if (this->out.position[n] == conv[c].pos1[1])
pos2_1 = n;
else if (this->out.position[n] == conv[c].pos2[0])
pos2_2 = n;
}
/* The general idea here is to fill in channels from the same position
* as good as possible. This means mixing left<->center and right<->center.
*/
/* left -> center */
if (pos1_0 != -1 && pos1_2 == -1 && pos2_0 == -1 && pos2_2 != -1)
this->matrix[pos1_0][pos2_2] = 1.0;
else if (pos1_0 != -1 && pos1_2 != -1 && pos2_0 == -1 && pos2_2 != -1)
this->matrix[pos1_0][pos2_2] = 0.5;
else if (pos1_0 != -1 && pos1_2 == -1 && pos2_0 != -1 && pos2_2 != -1)
this->matrix[pos1_0][pos2_2] = 1.0;
/* right -> center */
if (pos1_1 != -1 && pos1_2 == -1 && pos2_1 == -1 && pos2_2 != -1)
this->matrix[pos1_1][pos2_2] = 1.0;
else if (pos1_1 != -1 && pos1_2 != -1 && pos2_1 == -1 && pos2_2 != -1)
this->matrix[pos1_1][pos2_2] = 0.5;
else if (pos1_1 != -1 && pos1_2 == -1 && pos2_1 != -1 && pos2_2 != -1)
this->matrix[pos1_1][pos2_2] = 1.0;
/* center -> left */
if (pos1_2 != -1 && pos1_0 == -1 && pos2_2 == -1 && pos2_0 != -1)
this->matrix[pos1_2][pos2_0] = 1.0;
else if (pos1_2 != -1 && pos1_0 != -1 && pos2_2 == -1 && pos2_0 != -1)
this->matrix[pos1_2][pos2_0] = 0.5;
else if (pos1_2 != -1 && pos1_0 == -1 && pos2_2 != -1 && pos2_0 != -1)
this->matrix[pos1_2][pos2_0] = 1.0;
/* center -> right */
if (pos1_2 != -1 && pos1_1 == -1 && pos2_2 == -1 && pos2_1 != -1)
this->matrix[pos1_2][pos2_1] = 1.0;
else if (pos1_2 != -1 && pos1_1 != -1 && pos2_2 == -1 && pos2_1 != -1)
this->matrix[pos1_2][pos2_1] = 0.5;
else if (pos1_2 != -1 && pos1_1 == -1 && pos2_2 != -1 && pos2_1 != -1)
this->matrix[pos1_2][pos2_1] = 1.0;
}
}
/*
* Detect and fill in channels not handled by the
* above two, e.g. center to left/right front in
* 5.1 to 2.0 (or the other way around).
*
* Unfortunately, limited to static conversions
* for now.
*/
static void
gst_channel_mix_detect_pos (GstAudioInfo * info,
gint * f, gboolean * has_f,
gint * c, gboolean * has_c, gint * r, gboolean * has_r,
gint * s, gboolean * has_s, gint * b, gboolean * has_b)
{
gint n;
for (n = 0; n < info->channels; n++) {
switch (info->position[n]) {
case GST_AUDIO_CHANNEL_POSITION_MONO:
f[1] = n;
*has_f = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT:
f[0] = n;
*has_f = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT:
f[2] = n;
*has_f = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER:
c[1] = n;
*has_c = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER:
c[0] = n;
*has_c = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER:
c[2] = n;
*has_c = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_REAR_CENTER:
r[1] = n;
*has_r = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_REAR_LEFT:
r[0] = n;
*has_r = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT:
r[2] = n;
*has_r = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT:
s[0] = n;
*has_s = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT:
s[2] = n;
*has_s = TRUE;
break;
case GST_AUDIO_CHANNEL_POSITION_LFE1:
*has_b = TRUE;
b[1] = n;
break;
default:
break;
}
}
}
static void
gst_channel_mix_fill_one_other (gfloat ** matrix,
GstAudioInfo * from_info, gint * from_idx,
GstAudioInfo * to_info, gint * to_idx, gfloat ratio)
{
/* src & dst have center => passthrough */
if (from_idx[1] != -1 && to_idx[1] != -1) {
matrix[from_idx[1]][to_idx[1]] = ratio;
}
/* src & dst have left => passthrough */
if (from_idx[0] != -1 && to_idx[0] != -1) {
matrix[from_idx[0]][to_idx[0]] = ratio;
}
/* src & dst have right => passthrough */
if (from_idx[2] != -1 && to_idx[2] != -1) {
matrix[from_idx[2]][to_idx[2]] = ratio;
}
/* src has left & dst has center => put into center */
if (from_idx[0] != -1 && to_idx[1] != -1 && from_idx[1] != -1) {
matrix[from_idx[0]][to_idx[1]] = 0.5 * ratio;
} else if (from_idx[0] != -1 && to_idx[1] != -1 && from_idx[1] == -1) {
matrix[from_idx[0]][to_idx[1]] = ratio;
}
/* src has right & dst has center => put into center */
if (from_idx[2] != -1 && to_idx[1] != -1 && from_idx[1] != -1) {
matrix[from_idx[2]][to_idx[1]] = 0.5 * ratio;
} else if (from_idx[2] != -1 && to_idx[1] != -1 && from_idx[1] == -1) {
matrix[from_idx[2]][to_idx[1]] = ratio;
}
/* src has center & dst has left => passthrough */
if (from_idx[1] != -1 && to_idx[0] != -1 && from_idx[0] != -1) {
matrix[from_idx[1]][to_idx[0]] = 0.5 * ratio;
} else if (from_idx[1] != -1 && to_idx[0] != -1 && from_idx[0] == -1) {
matrix[from_idx[1]][to_idx[0]] = ratio;
}
/* src has center & dst has right => passthrough */
if (from_idx[1] != -1 && to_idx[2] != -1 && from_idx[2] != -1) {
matrix[from_idx[1]][to_idx[2]] = 0.5 * ratio;
} else if (from_idx[1] != -1 && to_idx[2] != -1 && from_idx[2] == -1) {
matrix[from_idx[1]][to_idx[2]] = ratio;
}
}
#define RATIO_CENTER_FRONT (1.0 / sqrt (2.0))
#define RATIO_CENTER_SIDE (1.0 / 2.0)
#define RATIO_CENTER_REAR (1.0 / sqrt (8.0))
#define RATIO_FRONT_CENTER (1.0 / sqrt (2.0))
#define RATIO_FRONT_SIDE (1.0 / sqrt (2.0))
#define RATIO_FRONT_REAR (1.0 / 2.0)
#define RATIO_SIDE_CENTER (1.0 / 2.0)
#define RATIO_SIDE_FRONT (1.0 / sqrt (2.0))
#define RATIO_SIDE_REAR (1.0 / sqrt (2.0))
#define RATIO_CENTER_BASS (1.0 / sqrt (2.0))
#define RATIO_FRONT_BASS (1.0)
#define RATIO_SIDE_BASS (1.0 / sqrt (2.0))
#define RATIO_REAR_BASS (1.0 / sqrt (2.0))
static void
gst_channel_mix_fill_others (AudioConvertCtx * this)
{
gboolean in_has_front = FALSE, out_has_front = FALSE,
in_has_center = FALSE, out_has_center = FALSE,
in_has_rear = FALSE, out_has_rear = FALSE,
in_has_side = FALSE, out_has_side = FALSE,
in_has_bass = FALSE, out_has_bass = FALSE;
/* LEFT, RIGHT, MONO */
gint in_f[3] = { -1, -1, -1 };
gint out_f[3] = { -1, -1, -1 };
/* LOC, ROC, CENTER */
gint in_c[3] = { -1, -1, -1 };
gint out_c[3] = { -1, -1, -1 };
/* RLEFT, RRIGHT, RCENTER */
gint in_r[3] = { -1, -1, -1 };
gint out_r[3] = { -1, -1, -1 };
/* SLEFT, INVALID, SRIGHT */
gint in_s[3] = { -1, -1, -1 };
gint out_s[3] = { -1, -1, -1 };
/* INVALID, LFE, INVALID */
gint in_b[3] = { -1, -1, -1 };
gint out_b[3] = { -1, -1, -1 };
/* First see where (if at all) the various channels from/to
* which we want to convert are located in our matrix/array. */
gst_channel_mix_detect_pos (&this->in,
in_f, &in_has_front,
in_c, &in_has_center, in_r, &in_has_rear,
in_s, &in_has_side, in_b, &in_has_bass);
gst_channel_mix_detect_pos (&this->out,
out_f, &out_has_front,
out_c, &out_has_center, out_r, &out_has_rear,
out_s, &out_has_side, out_b, &out_has_bass);
/* The general idea here is:
* - if the source has a channel that the destination doesn't have mix
* it into the nearest available destination channel
* - if the destination has a channel that the source doesn't have mix
* the nearest source channel into the destination channel
*
* The ratio for the mixing becomes lower as the distance between the
* channels gets larger
*/
/* center <-> front/side/rear */
if (!in_has_center && in_has_front && out_has_center) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_c, RATIO_CENTER_FRONT);
} else if (!in_has_center && !in_has_front && in_has_side && out_has_center) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_c, RATIO_CENTER_SIDE);
} else if (!in_has_center && !in_has_front && !in_has_side && in_has_rear
&& out_has_center) {
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_r, &this->out,
out_c, RATIO_CENTER_REAR);
} else if (in_has_center && !out_has_center && out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_c, &this->out, out_f, RATIO_CENTER_FRONT);
} else if (in_has_center && !out_has_center && !out_has_front && out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_c, &this->out, out_s, RATIO_CENTER_SIDE);
} else if (in_has_center && !out_has_center && !out_has_front && !out_has_side
&& out_has_rear) {
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_c, &this->out,
out_r, RATIO_CENTER_REAR);
}
/* front <-> center/side/rear */
if (!in_has_front && in_has_center && !in_has_side && out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_c, &this->out, out_f, RATIO_CENTER_FRONT);
} else if (!in_has_front && !in_has_center && in_has_side && out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_f, RATIO_FRONT_SIDE);
} else if (!in_has_front && in_has_center && in_has_side && out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_c, &this->out, out_f, 0.5 * RATIO_CENTER_FRONT);
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_f, 0.5 * RATIO_FRONT_SIDE);
} else if (!in_has_front && !in_has_center && !in_has_side && in_has_rear
&& out_has_front) {
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_r, &this->out,
out_f, RATIO_FRONT_REAR);
} else if (in_has_front && out_has_center && !out_has_side && !out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_c, RATIO_CENTER_FRONT);
} else if (in_has_front && !out_has_center && out_has_side && !out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_s, RATIO_FRONT_SIDE);
} else if (in_has_front && out_has_center && out_has_side && !out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_c, 0.5 * RATIO_CENTER_FRONT);
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_s, 0.5 * RATIO_FRONT_SIDE);
} else if (in_has_front && !out_has_center && !out_has_side && !out_has_front
&& out_has_rear) {
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_f, &this->out,
out_r, RATIO_FRONT_REAR);
}
/* side <-> center/front/rear */
if (!in_has_side && in_has_front && !in_has_rear && out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_s, RATIO_FRONT_SIDE);
} else if (!in_has_side && !in_has_front && in_has_rear && out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_r, &this->out, out_s, RATIO_SIDE_REAR);
} else if (!in_has_side && in_has_front && in_has_rear && out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_s, 0.5 * RATIO_FRONT_SIDE);
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_r, &this->out, out_s, 0.5 * RATIO_SIDE_REAR);
} else if (!in_has_side && !in_has_front && !in_has_rear && in_has_center
&& out_has_side) {
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_c, &this->out,
out_s, RATIO_CENTER_SIDE);
} else if (in_has_side && out_has_front && !out_has_rear && !out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_f, RATIO_FRONT_SIDE);
} else if (in_has_side && !out_has_front && out_has_rear && !out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_r, RATIO_SIDE_REAR);
} else if (in_has_side && out_has_front && out_has_rear && !out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_f, 0.5 * RATIO_FRONT_SIDE);
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_r, 0.5 * RATIO_SIDE_REAR);
} else if (in_has_side && !out_has_front && !out_has_rear && out_has_center
&& !out_has_side) {
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_s, &this->out,
out_c, RATIO_CENTER_SIDE);
}
/* rear <-> center/front/side */
if (!in_has_rear && in_has_side && out_has_rear) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_r, RATIO_SIDE_REAR);
} else if (!in_has_rear && !in_has_side && in_has_front && out_has_rear) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_r, RATIO_FRONT_REAR);
} else if (!in_has_rear && !in_has_side && !in_has_front && in_has_center
&& out_has_rear) {
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_c, &this->out,
out_r, RATIO_CENTER_REAR);
} else if (in_has_rear && !out_has_rear && out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_r, &this->out, out_s, RATIO_SIDE_REAR);
} else if (in_has_rear && !out_has_rear && !out_has_side && out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_r, &this->out, out_f, RATIO_FRONT_REAR);
} else if (in_has_rear && !out_has_rear && !out_has_side && !out_has_front
&& out_has_center) {
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_r, &this->out,
out_c, RATIO_CENTER_REAR);
}
/* bass <-> any */
if (in_has_bass && !out_has_bass) {
if (out_has_center) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_b, &this->out, out_c, RATIO_CENTER_BASS);
}
if (out_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_b, &this->out, out_f, RATIO_FRONT_BASS);
}
if (out_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_b, &this->out, out_s, RATIO_SIDE_BASS);
}
if (out_has_rear) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_b, &this->out, out_r, RATIO_REAR_BASS);
}
} else if (!in_has_bass && out_has_bass) {
if (in_has_center) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_c, &this->out, out_b, RATIO_CENTER_BASS);
}
if (in_has_front) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_f, &this->out, out_b, RATIO_FRONT_BASS);
}
if (in_has_side) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_s, &this->out, out_b, RATIO_REAR_BASS);
}
if (in_has_rear) {
gst_channel_mix_fill_one_other (this->matrix,
&this->in, in_r, &this->out, out_b, RATIO_REAR_BASS);
}
}
}
/*
* Normalize output values.
*/
static void
gst_channel_mix_fill_normalize (AudioConvertCtx * this)
{
gfloat sum, top = 0;
gint i, j;
for (j = 0; j < this->out.channels; j++) {
/* calculate sum */
sum = 0.0;
for (i = 0; i < this->in.channels; i++) {
sum += fabs (this->matrix[i][j]);
}
if (sum > top) {
top = sum;
}
}
/* normalize to this */
if (top == 0.0)
return;
for (j = 0; j < this->out.channels; j++) {
for (i = 0; i < this->in.channels; i++) {
this->matrix[i][j] /= top;
}
}
}
static gboolean
gst_channel_mix_fill_special (AudioConvertCtx * this)
{
GstAudioInfo *in = &this->in, *out = &this->out;
/* Special, standard conversions here */
/* Mono<->Stereo, just a fast-path */
if (in->channels == 2 && out->channels == 1 &&
((in->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT &&
in->position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT) ||
(in->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT &&
in->position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT)) &&
out->position[0] == GST_AUDIO_CHANNEL_POSITION_MONO) {
this->matrix[0][0] = 0.5;
this->matrix[1][0] = 0.5;
return TRUE;
} else if (in->channels == 1 && out->channels == 2 &&
((out->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT &&
out->position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT) ||
(out->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT &&
out->position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT)) &&
in->position[0] == GST_AUDIO_CHANNEL_POSITION_MONO) {
this->matrix[0][0] = 1.0;
this->matrix[0][1] = 1.0;
return TRUE;
}
/* TODO: 5.1 <-> Stereo and other standard conversions */
return FALSE;
}
/*
* Automagically generate conversion matrix.
*/
static void
gst_channel_mix_fill_matrix (AudioConvertCtx * this)
{
if (gst_channel_mix_fill_special (this))
return;
gst_channel_mix_fill_identical (this);
if (!GST_AUDIO_INFO_IS_UNPOSITIONED (&this->in)) {
gst_channel_mix_fill_compatible (this);
gst_channel_mix_fill_others (this);
gst_channel_mix_fill_normalize (this);
}
}
/* only call after this->out and this->in are filled in */
void
gst_channel_mix_setup_matrix (AudioConvertCtx * this)
{
gint i, j;
/* don't lose memory */
gst_channel_mix_unset_matrix (this);
/* temp storage */
if (GST_AUDIO_FORMAT_INFO_IS_INTEGER (this->in.finfo) ||
GST_AUDIO_FORMAT_INFO_IS_INTEGER (this->out.finfo)) {
this->tmp = (gpointer) g_new (gint32, this->out.channels);
} else {
this->tmp = (gpointer) g_new (gdouble, this->out.channels);
}
/* allocate */
this->matrix = g_new0 (gfloat *, this->in.channels);
for (i = 0; i < this->in.channels; i++) {
this->matrix[i] = g_new (gfloat, this->out.channels);
for (j = 0; j < this->out.channels; j++)
this->matrix[i][j] = 0.;
}
/* setup the matrix' internal values */
gst_channel_mix_fill_matrix (this);
#ifndef GST_DISABLE_GST_DEBUG
/* debug */
{
GString *s;
s = g_string_new ("Matrix for");
g_string_append_printf (s, " %d -> %d: ",
this->in.channels, this->out.channels);
g_string_append (s, "{");
for (i = 0; i < this->in.channels; i++) {
if (i != 0)
g_string_append (s, ",");
g_string_append (s, " {");
for (j = 0; j < this->out.channels; j++) {
if (j != 0)
g_string_append (s, ",");
g_string_append_printf (s, " %f", this->matrix[i][j]);
}
g_string_append (s, " }");
}
g_string_append (s, " }");
GST_DEBUG ("%s", s->str);
g_string_free (s, TRUE);
}
#endif
}
gboolean
gst_channel_mix_passthrough (AudioConvertCtx * this)
{
gint i;
guint64 in_mask, out_mask;
/* only NxN matrices can be identities */
if (this->in.channels != this->out.channels)
return FALSE;
/* passthrough if both channel masks are the same */
in_mask = out_mask = 0;
for (i = 0; i < this->in.channels; i++) {
in_mask |= this->in.position[i];
out_mask |= this->out.position[i];
}
return in_mask == out_mask;
}
/* IMPORTANT: out_data == in_data is possible, make sure to not overwrite data
* you might need later on! */
void
gst_channel_mix_mix_int (AudioConvertCtx * this,
gint32 * in_data, gint32 * out_data, gint samples)
{
gint in, out, n;
gint64 res;
gboolean backwards;
gint inchannels, outchannels;
gint32 *tmp = (gint32 *) this->tmp;
g_return_if_fail (this->matrix != NULL);
g_return_if_fail (this->tmp != NULL);
inchannels = this->in.channels;
outchannels = this->out.channels;
backwards = outchannels > inchannels;
/* FIXME: use orc here? */
for (n = (backwards ? samples - 1 : 0); n < samples && n >= 0;
backwards ? n-- : n++) {
for (out = 0; out < outchannels; out++) {
/* convert */
res = 0;
for (in = 0; in < inchannels; in++) {
res += in_data[n * inchannels + in] * this->matrix[in][out];
}
/* clip (shouldn't we use doubles instead as intermediate format?) */
if (res < G_MININT32)
res = G_MININT32;
else if (res > G_MAXINT32)
res = G_MAXINT32;
tmp[out] = res;
}
memcpy (&out_data[n * outchannels], this->tmp,
sizeof (gint32) * outchannels);
}
}
void
gst_channel_mix_mix_float (AudioConvertCtx * this,
gdouble * in_data, gdouble * out_data, gint samples)
{
gint in, out, n;
gdouble res;
gboolean backwards;
gint inchannels, outchannels;
gdouble *tmp = (gdouble *) this->tmp;
g_return_if_fail (this->matrix != NULL);
g_return_if_fail (this->tmp != NULL);
inchannels = this->in.channels;
outchannels = this->out.channels;
backwards = outchannels > inchannels;
/* FIXME: use liboil here? */
for (n = (backwards ? samples - 1 : 0); n < samples && n >= 0;
backwards ? n-- : n++) {
for (out = 0; out < outchannels; out++) {
/* convert */
res = 0.0;
for (in = 0; in < inchannels; in++) {
res += in_data[n * inchannels + in] * this->matrix[in][out];
}
/* clip (shouldn't we use doubles instead as intermediate format?) */
if (res < -1.0)
res = -1.0;
else if (res > 1.0)
res = 1.0;
tmp[out] = res;
}
memcpy (&out_data[n * outchannels], this->tmp,
sizeof (gdouble) * outchannels);
}
}
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