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gst/audioconvert/: Implement a channel mixer.

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Original commit message from CVS:
* gst/audioconvert/Makefile.am:
* gst/audioconvert/gstaudioconvert.c: (gst_audio_convert_init),
(gst_audio_convert_link), (gst_audio_convert_change_state),
(gst_audio_convert_channels):
* gst/audioconvert/gstchannelmix.c:
(gst_audio_convert_unset_matrix),
(gst_audio_convert_fill_identical),
(gst_audio_convert_fill_compatible),
(gst_audio_convert_detect_pos), (gst_audio_convert_fill_one_other),
(gst_audio_convert_fill_others),
(gst_audio_convert_fill_normalize),
(gst_audio_convert_fill_matrix), (gst_audio_convert_setup_matrix),
(gst_audio_convert_passthrough), (gst_audio_convert_mix):
* gst/audioconvert/gstchannelmix.h:
Implement a channel mixer.
This commit is contained in:
Ronald S. Bultje 2004-11-28 16:09:13 +00:00
parent a931717c2e
commit 4fdf8d5b16
5 changed files with 706 additions and 180 deletions
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18
ChangeLog
View file

@ -1,3 +1,21 @@
2004-11-28 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* gst/audioconvert/Makefile.am:
* gst/audioconvert/gstaudioconvert.c: (gst_audio_convert_init),
(gst_audio_convert_link), (gst_audio_convert_change_state),
(gst_audio_convert_channels):
* gst/audioconvert/gstchannelmix.c:
(gst_audio_convert_unset_matrix),
(gst_audio_convert_fill_identical),
(gst_audio_convert_fill_compatible),
(gst_audio_convert_detect_pos), (gst_audio_convert_fill_one_other),
(gst_audio_convert_fill_others),
(gst_audio_convert_fill_normalize),
(gst_audio_convert_fill_matrix), (gst_audio_convert_setup_matrix),
(gst_audio_convert_passthrough), (gst_audio_convert_mix):
* gst/audioconvert/gstchannelmix.h:
Implement a channel mixer.
2004-11-28 Martin Soto <martinsoto@users.sourceforge.net>
* ext/alsa/gstalsasink.c (gst_alsa_sink_loop):

12
gst/audioconvert/Makefile.am
View file

@ -1,7 +1,15 @@
plugin_LTLIBRARIES = libgstaudioconvert.la
libgstaudioconvert_la_SOURCES = gstaudioconvert.c bufferframesconvert.c plugin.c plugin.h
libgstaudioconvert_la_SOURCES = \
gstaudioconvert.c \
gstchannelmix.c \
bufferframesconvert.c \
plugin.c
libgstaudioconvert_la_CFLAGS = $(GST_CFLAGS)
libgstaudioconvert_la_LIBADD =
libgstaudioconvert_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
noinst_HEADERS = \
gstchannelmix.h \
plugin.h

196
gst/audioconvert/gstaudioconvert.c
View file

@ -39,62 +39,13 @@
#include <gst/gst.h>
#include <gst/audio/multichannel.h>
#include <string.h>
#include "gstchannelmix.h"
#include "plugin.h"
GST_DEBUG_CATEGORY_STATIC (audio_convert_debug);
#define GST_CAT_DEFAULT (audio_convert_debug)
GST_DEBUG_CATEGORY (audio_convert_debug);
/*** DEFINITIONS **************************************************************/
#define GST_TYPE_AUDIO_CONVERT (gst_audio_convert_get_type())
#define GST_AUDIO_CONVERT(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_CONVERT,GstAudioConvert))
#define GST_AUDIO_CONVERT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_CONVERT,GstAudioConvert))
#define GST_IS_AUDIO_CONVERT(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_CONVERT))
#define GST_IS_AUDIO_CONVERT_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_CONVERT))
typedef struct _GstAudioConvert GstAudioConvert;
typedef struct _GstAudioConvertCaps GstAudioConvertCaps;
typedef struct _GstAudioConvertClass GstAudioConvertClass;
/* this struct is a handy way of passing around all the caps info ... */
struct _GstAudioConvertCaps
{
/* general caps */
gboolean is_int;
gint endianness;
gint width;
gint rate;
gint channels;
GstAudioChannelPosition *pos;
/* int audio caps */
gboolean sign;
gint depth;
/* float audio caps */
gint buffer_frames;
};
struct _GstAudioConvert
{
GstElement element;
/* pads */
GstPad *sink;
GstPad *src;
GstAudioConvertCaps srccaps;
GstAudioConvertCaps sinkcaps;
/* conversion functions */
GstBuffer *(*convert_internal) (GstAudioConvert * this, GstBuffer * buf);
};
struct _GstAudioConvertClass
{
GstElementClass parent_class;
};
static GstElementDetails audio_convert_details = {
"Audio Conversion",
"Filter/Converter/Audio",
@ -248,6 +199,7 @@ gst_audio_convert_init (GstAudioConvert * this)
this->convert_internal = NULL;
this->sinkcaps.pos = NULL;
this->srccaps.pos = NULL;
this->matrix = NULL;
}
static void
@ -434,6 +386,9 @@ gst_audio_convert_link (GstPad * pad, const GstCaps * caps)
this = GST_AUDIO_CONVERT (GST_OBJECT_PARENT (pad));
otherpad = (pad == this->src ? this->sink : this->src);
/* we'll need a new matrix after every new negotiation */
gst_audio_convert_unset_matrix (this);
ac_caps.pos = NULL;
if (!gst_audio_convert_parse_caps (caps, &ac_caps))
return GST_PAD_LINK_REFUSED;
@ -639,6 +594,7 @@ gst_audio_convert_change_state (GstElement * element)
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_READY:
this->convert_internal = NULL;
gst_audio_convert_unset_matrix (this);
break;
default:
break;
@ -895,138 +851,22 @@ static GstBuffer *
gst_audio_convert_channels (GstAudioConvert * this, GstBuffer * buf)
{
GstBuffer *ret;
gint c, i, count, ci, co;
gint32 *src, *dest;
gint count;
/* 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_FRONT_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}}
};
gboolean set[8] = { FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE };
/* setup if not yet done */
if (!this->matrix)
gst_audio_convert_setup_matrix (this);
if (this->sinkcaps.channels == this->srccaps.channels) {
for (i = 0; i < this->sinkcaps.channels; i++) {
if (this->sinkcaps.pos[i] != this->srccaps.pos[i])
break;
}
if (i == this->sinkcaps.channels)
return buf;
}
/* check for passthrough */
if (gst_audio_convert_passthrough (this))
return buf;
/* convert */
count = GST_BUFFER_SIZE (buf) / 4 / this->sinkcaps.channels;
ret = gst_audio_convert_get_buffer (buf, count * 4 * this->srccaps.channels);
/* conversions from compatible (but not the same) channel schemes. This
* goes two ways: if the sink has both pos1[0,1] and src has pos2[0] or
* if the src has both pos1[0,1] and sink has pos2[0], then we do the
* conversion. We hereby assume that the existance of pos1[0,1] and
* pos2[0] are mututally exclusive. There are no checks for that,
* unfortunately. This shouldn't lead to issues (like crashes or so),
* though. */
for (c = 0; conv[c].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; c++) {
gint pos1_0 = -1, pos1_1 = -1, pos2_0 = -1, n;
/* Try to go from the given 2 channels to the given 1 channel */
for (n = 0; n < this->sinkcaps.channels; n++) {
if (this->sinkcaps.pos[n] == conv[c].pos1[0])
pos1_0 = n;
else if (this->sinkcaps.pos[n] == conv[c].pos1[1])
pos1_1 = n;
}
for (n = 0; n < this->srccaps.channels; n++) {
if (this->srccaps.pos[n] == conv[c].pos2[0])
pos2_0 = n;
}
if (pos1_0 != -1 && pos1_1 != -1 && pos2_0 != -1) {
src = (gint32 *) GST_BUFFER_DATA (buf);
dest = (gint32 *) GST_BUFFER_DATA (ret);
for (i = 0; i < count; i++) {
dest[pos2_0] = (src[pos1_0] >> 1) + (src[pos1_1] >> 1) +
((src[pos1_0] & 1) & (src[pos1_1] & 1));
src += this->sinkcaps.channels;
dest += this->srccaps.channels;
}
set[pos2_0] = TRUE;
}
/* Try to go from the given 1 channel to the given 2 channels */
pos1_0 = -1;
pos1_1 = -1;
pos2_0 = -1;
for (n = 0; n < this->srccaps.channels; n++) {
if (this->srccaps.pos[n] == conv[c].pos1[0])
pos1_0 = n;
else if (this->srccaps.pos[n] == conv[c].pos1[1])
pos1_1 = n;
}
for (n = 0; n < this->sinkcaps.channels; n++) {
if (this->sinkcaps.pos[n] == conv[c].pos2[0])
pos2_0 = n;
}
if (pos1_0 != -1 && pos1_1 != -1 && pos2_0 != -1) {
src = (gint32 *) GST_BUFFER_DATA (buf);
dest = (gint32 *) GST_BUFFER_DATA (ret);
for (i = 0; i < count; i++) {
dest[pos1_0] = dest[pos1_1] = src[pos2_0];
src += this->sinkcaps.channels;
dest += this->srccaps.channels;
}
set[pos1_0] = set[pos1_1] = TRUE;
}
}
/* reset data pointers */
src = (gint32 *) GST_BUFFER_DATA (buf);
dest = (gint32 *) GST_BUFFER_DATA (ret);
/* 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->srccaps.channels; co++) {
/* find a channel in input with same position */
for (ci = 0; ci < this->sinkcaps.channels; ci++) {
if (this->sinkcaps.pos[ci] == this->srccaps.pos[co]) {
for (i = 0; i < count; i++) {
dest[i * this->srccaps.channels + co] =
src[i * this->sinkcaps.channels + ci];
}
set[co] = TRUE;
break;
}
}
/* if not found, then silence */
if (ci == this->sinkcaps.channels && !set[co]) {
for (i = 0; i < count; i++) {
dest[i * this->srccaps.channels + co] = 0;
}
}
}
gst_audio_convert_mix (this, (gint32 *) GST_BUFFER_DATA (buf),
(gint32 *) GST_BUFFER_DATA (ret), count);
gst_buffer_unref (buf);
return ret;
}

554
gst/audioconvert/gstchannelmix.c Normal file
View file

@ -0,0 +1,554 @@
/* GStreamer
* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <gst/audio/multichannel.h>
#include "gstchannelmix.h"
/*
* Channel matrix functions.
*/
void
gst_audio_convert_unset_matrix (GstAudioConvert * this)
{
gint i;
/* don't access if nothing there */
if (!this->matrix)
return;
/* free */
for (i = 0; i < this->sinkcaps.channels; i++)
g_free (this->matrix[i]);
g_free (this->matrix);
this->matrix = 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_audio_convert_fill_identical (GstAudioConvert * 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->srccaps.channels; co++) {
/* find a channel in input with same position */
for (ci = 0; ci < this->sinkcaps.channels; ci++) {
if (this->sinkcaps.pos[ci] == this->srccaps.pos[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_audio_convert_fill_compatible (GstAudioConvert * 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_FRONT_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. This
* goes two ways: if the sink has both pos1[0,1] and src has pos2[0] or
* if the src has both pos1[0,1] and sink has pos2[0], then we do the
* conversion. We hereby assume that the existance of pos1[0,1] and
* pos2[0] are mututally exclusive. There are no checks for that,
* unfortunately. This shouldn't lead to issues (like crashes or so),
* though. */
for (c = 0; conv[c].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; c++) {
gint pos1_0 = -1, pos1_1 = -1, pos2_0 = -1, n;
/* Try to go from the given 2 channels to the given 1 channel */
for (n = 0; n < this->sinkcaps.channels; n++) {
if (this->sinkcaps.pos[n] == conv[c].pos1[0])
pos1_0 = n;
else if (this->sinkcaps.pos[n] == conv[c].pos1[1])
pos1_1 = n;
}
for (n = 0; n < this->srccaps.channels; n++) {
if (this->srccaps.pos[n] == conv[c].pos2[0])
pos2_0 = n;
}
if (pos1_0 != -1 && pos1_1 != -1 && pos2_0 != -1) {
this->matrix[pos1_0][pos2_0] = -1.0;
this->matrix[pos1_1][pos2_0] = 1.0;
}
/* Try to go from the given 1 channel to the given 2 channels */
pos1_0 = -1;
pos1_1 = -1;
pos2_0 = -1;
for (n = 0; n < this->srccaps.channels; n++) {
if (this->srccaps.pos[n] == conv[c].pos1[0])
pos1_0 = n;
else if (this->srccaps.pos[n] == conv[c].pos1[1])
pos1_1 = n;
}
for (n = 0; n < this->sinkcaps.channels; n++) {
if (this->sinkcaps.pos[n] == conv[c].pos2[0])
pos2_0 = n;
}
if (pos1_0 != -1 && pos1_1 != -1 && pos2_0 != -1) {
this->matrix[pos2_0][pos1_0] = -1.0;
this->matrix[pos2_0][pos1_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_audio_convert_detect_pos (GstAudioConvertCaps * caps,
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 < caps->channels; n++) {
switch (caps->pos[n]) {
case GST_AUDIO_CHANNEL_POSITION_FRONT_MONO:
case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT:
case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT:
*has_f = TRUE;
if (f[0] == -1)
f[0] = n;
else
f[1] = n;
break;
case GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER:
case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER:
case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER:
*has_c = TRUE;
if (c[0] == -1)
c[0] = n;
else
c[1] = n;
break;
case GST_AUDIO_CHANNEL_POSITION_REAR_CENTER:
case GST_AUDIO_CHANNEL_POSITION_REAR_LEFT:
case GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT:
*has_r = TRUE;
if (r[0] == -1)
r[0] = n;
else
r[1] = n;
break;
case GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT:
case GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT:
*has_s = TRUE;
if (s[0] == -1)
s[0] = n;
else
s[1] = n;
break;
case GST_AUDIO_CHANNEL_POSITION_LFE:
*has_b = TRUE;
b[0] = n;
break;
default:
break;
}
}
}
static void
gst_audio_convert_fill_one_other (gfloat ** matrix,
GstAudioConvertCaps * from_caps, gint * from_idx,
GstAudioChannelPosition from_pos_l,
GstAudioChannelPosition from_pos_r,
GstAudioChannelPosition from_pos_c,
GstAudioConvertCaps * to_caps, gint * to_idx,
GstAudioChannelPosition to_pos_l,
GstAudioChannelPosition to_pos_r,
GstAudioChannelPosition to_pos_c, gfloat ratio)
{
gfloat in_r, out_r[2];
/*
* The idea is that we add up from the input (which means that if we
* have stereo input, we divide their sum by two) and put that in
* the matrix for their output ratio (given in $ratio).
* For left channels, we need to invert the signal sign (* -1).
*/
if (from_caps->pos[from_idx[0]] == from_pos_c)
in_r = 1.0;
else
in_r = 0.5;
if (to_caps->pos[to_idx[0]] == to_pos_l)
out_r[0] = in_r * -ratio;
else
out_r[0] = in_r * ratio;
if (to_idx[1] != -1) {
if (to_caps->pos[to_idx[1]] == to_pos_l)
out_r[1] = in_r * -ratio;
else
out_r[1] = in_r * ratio;
}
matrix[from_idx[0]][to_idx[0]] = out_r[0];
if (to_idx[1] != -1)
matrix[from_idx[0]][to_idx[1]] = out_r[1];
if (from_idx[1] != -1) {
matrix[from_idx[1]][to_idx[0]] = out_r[0];
if (to_idx[1] != -1)
matrix[from_idx[1]][to_idx[1]] = out_r[1];
}
}
#define RATIO_FRONT_CENTER (1.0 / sqrt (2.0))
#define RATIO_FRONT_REAR (1.0 / sqrt (2.0))
#define RATIO_FRONT_BASS (1.0)
#define RATIO_REAR_BASS (1.0 / sqrt (2.0))
#define RATIO_CENTER_BASS (1.0 / sqrt (2.0))
static void
gst_audio_convert_fill_others (GstAudioConvert * 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;
gint in_f[2] = { -1, -1 }, out_f[2] = {
-1, -1}, in_c[2] = {
-1, -1}, out_c[2] = {
-1, -1}, in_r[2] = {
-1, -1}, out_r[2] = {
-1, -1}, in_s[2] = {
-1, -1}, out_s[2] = {
-1, -1}, in_b[2] = {
-1, -1}, out_b[2] = {
-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_audio_convert_detect_pos (&this->sinkcaps,
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_audio_convert_detect_pos (&this->srccaps,
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);
/* center/front */
if (!in_has_center && in_has_front && out_has_center) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_f,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_MONO,
&this->srccaps, out_c,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, RATIO_FRONT_CENTER);
} else if (in_has_center && !out_has_center && out_has_front) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_c,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
&this->srccaps, out_f,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_MONO, RATIO_FRONT_CENTER);
}
/* rear/front */
if (!in_has_rear && in_has_front && out_has_rear) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_f,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_MONO,
&this->srccaps, out_r,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER, RATIO_FRONT_REAR);
} else if (in_has_center && !out_has_center && out_has_front) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_r,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
&this->srccaps, out_f,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_MONO, RATIO_FRONT_REAR);
}
/* bass/any */
if (in_has_bass && !out_has_bass) {
if (out_has_front) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_b,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_LFE,
&this->srccaps, out_f,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_MONO, RATIO_FRONT_BASS);
}
if (out_has_center) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_b,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_LFE,
&this->srccaps, out_c,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, RATIO_CENTER_BASS);
}
if (out_has_rear) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_b,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_LFE,
&this->srccaps, out_r,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER, RATIO_REAR_BASS);
}
} else if (!in_has_bass && out_has_bass) {
if (in_has_front) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_f,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_MONO,
&this->srccaps, out_b,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_LFE, RATIO_FRONT_BASS);
}
if (in_has_center) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_c,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
&this->srccaps, out_b,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_LFE, RATIO_CENTER_BASS);
}
if (in_has_rear) {
gst_audio_convert_fill_one_other (this->matrix,
&this->sinkcaps, in_r,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
&this->srccaps, out_b,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_LFE, RATIO_REAR_BASS);
}
}
/* FIXME: side */
}
/*
* Normalize output values.
*/
static void
gst_audio_convert_fill_normalize (GstAudioConvert * this)
{
gfloat sum, top = 0;
gint i, j;
for (j = 0; j < this->srccaps.channels; j++) {
/* calculate sum */
sum = 0.0;
for (i = 0; i < this->sinkcaps.channels; i++) {
sum += this->matrix[i][j];
}
if (sum > top) {
top = sum;
}
}
/* normalize to this */
for (j = 0; j < this->srccaps.channels; j++) {
for (i = 0; i < this->sinkcaps.channels; i++) {
this->matrix[i][j] /= top;
}
}
}
/*
* Automagically generate conversion matrix.
*/
static void
gst_audio_convert_fill_matrix (GstAudioConvert * this)
{
gst_audio_convert_fill_identical (this);
gst_audio_convert_fill_compatible (this);
gst_audio_convert_fill_others (this);
gst_audio_convert_fill_normalize (this);
}
void
gst_audio_convert_setup_matrix (GstAudioConvert * this)
{
gint i, j;
GString *s;
/* don't lose memory */
gst_audio_convert_unset_matrix (this);
/* allocate */
this->matrix = g_new0 (gfloat *, this->sinkcaps.channels);
for (i = 0; i < this->sinkcaps.channels; i++) {
this->matrix[i] = g_new (gfloat, this->srccaps.channels);
for (j = 0; j < this->srccaps.channels; j++)
this->matrix[i][j] = 0.;
}
/* setup the matrix' internal values */
gst_audio_convert_fill_matrix (this);
/* debug */
s = g_string_new ("Matrix for");
g_string_append_printf (s, " %d -> %d: ",
this->sinkcaps.channels, this->srccaps.channels);
g_string_append (s, "{");
for (i = 0; i < this->sinkcaps.channels; i++) {
if (i != 0)
g_string_append (s, ",");
g_string_append (s, " {");
for (j = 0; j < this->srccaps.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->str);
g_string_free (s, TRUE);
}
gboolean
gst_audio_convert_passthrough (GstAudioConvert * this)
{
gint i;
/* only NxN matrices can be identities */
if (this->sinkcaps.channels != this->srccaps.channels)
return FALSE;
/* this assumes a normalized matrix */
for (i = 0; i < this->sinkcaps.channels; i++)
if (this->matrix[i][i] != 1.)
return FALSE;
return TRUE;
}
void
gst_audio_convert_mix (GstAudioConvert * this,
gint32 * in_data, gint32 * out_data, gint samples)
{
gint in, out, n;
gint64 res;
/* FIXME: use liboil here? */
for (out = 0; out < this->srccaps.channels; out++) {
for (n = 0; n < samples; n++) {
/* convert */
res = 0;
for (in = 0; in < this->sinkcaps.channels; in++) {
res += in_data[n * this->sinkcaps.channels + 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;
/* store */
out_data[n * this->srccaps.channels + out] = res;
}
}
}

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/* GStreamer
* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* gstchannelmix.h: 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_CHANNEL_MIX_H__
#define __GST_CHANNEL_MIX_H__
#include <gst/gst.h>
#define GST_TYPE_AUDIO_CONVERT (gst_audio_convert_get_type())
#define GST_AUDIO_CONVERT(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_CONVERT,GstAudioConvert))
#define GST_AUDIO_CONVERT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_CONVERT,GstAudioConvert))
#define GST_IS_AUDIO_CONVERT(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_CONVERT))
#define GST_IS_AUDIO_CONVERT_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_CONVERT))
GST_DEBUG_CATEGORY_EXTERN (audio_convert_debug);
#define GST_CAT_DEFAULT (audio_convert_debug)
typedef struct _GstAudioConvert GstAudioConvert;
typedef struct _GstAudioConvertCaps GstAudioConvertCaps;
typedef struct _GstAudioConvertClass GstAudioConvertClass;
/* this struct is a handy way of passing around all the caps info ... */
struct _GstAudioConvertCaps
{
/* general caps */
gboolean is_int;
gint endianness;
gint width;
gint rate;
gint channels;
GstAudioChannelPosition *pos;
/* int audio caps */
gboolean sign;
gint depth;
/* float audio caps */
gint buffer_frames;
};
struct _GstAudioConvert
{
GstElement element;
/* pads */
GstPad *sink;
GstPad *src;
GstAudioConvertCaps srccaps;
GstAudioConvertCaps sinkcaps;
/* channel conversion matrix, m[in_channels][out_channels].
* If identity matrix, passthrough applies. */
gfloat **matrix;
/* conversion functions */
GstBuffer *(*convert_internal) (GstAudioConvert * this, GstBuffer * buf);
};
struct _GstAudioConvertClass
{
GstElementClass parent_class;
};
/*
* Delete channel mixer matrix.
*/
void gst_audio_convert_unset_matrix (GstAudioConvert * this);
/*
* Setup channel mixer matrix.
*/
void gst_audio_convert_setup_matrix (GstAudioConvert * this);
/*
* Checks for passthrough (= identity matrix).
*/
gboolean gst_audio_convert_passthrough (GstAudioConvert * this);
/*
* Do actual mixing.
*/
void gst_audio_convert_mix (GstAudioConvert * this,
gint32 * in_data,
gint32 * out_data,
gint samples);
#endif /* __GST_CHANNEL_MIX_H__ */