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gstreamer/gst/audioconvert/gstchannelmix.c
Tim-Philipp Müller 6c6619a669 audioconvert: never do mixing for 1->1 channel conversions 
MONO and NONE position are the same, for example, but in
general there isn't much to do here for such a conversion.

Fixes problem in audioconvert, which would end up using
a mixmatrix when converting between different mono format
because it thinks MONO positioning is different from
unpositioned channels, which is not the case in this
special case. The mixmatrix would end up being 0.0 so
audioconvert would convert to silence samples.

https://bugzilla.gnome.org/show_bug.cgi?id=724509
2014-02-18 10:48:07 +00:00

749 lines
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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 for 1->1 channels (MONO and NONE position are the same here) */
if (this->in.channels == 1 && this->out.channels == 1)
return TRUE;
/* 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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