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gstreamer/subprojects/gst-plugins-bad/gst/audiomixmatrix/gstaudiomixmatrix.c

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/*
* GStreamer
* Copyright (C) 2017 Vivia Nikolaidou <vivia@toolsonair.com>
*
* gstaudiomixmatrix.c
*
* 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.
*/
/**
* SECTION:element-audiomixmatrix
* @title: audiomixmatrix
* @short_description: Transform input/output channels according to a matrix
*
* This element transforms a given number of input channels into a given
* number of output channels according to a given transformation matrix. The
* matrix coefficients must be between -1 and 1: the number of rows is equal
* to the number of output channels and the number of columns is equal to the
* number of input channels. In the first-channels mode, input/output channels
* are automatically negotiated and the transformation matrix is a truncated
* identity matrix.
*
* ## Example matrix generation code
* To generate the matrix using code:
*
* |[
* GValue v = G_VALUE_INIT;
* GValue v2 = G_VALUE_INIT;
* GValue v3 = G_VALUE_INIT;
*
* g_value_init (&v2, GST_TYPE_ARRAY);
* g_value_init (&v3, G_TYPE_DOUBLE);
* g_value_set_double (&v3, 1);
* gst_value_array_append_value (&v2, &v3);
* g_value_unset (&v3);
* [ Repeat for as many double as your input channels - unset and reinit v3 ]
* g_value_init (&v, GST_TYPE_ARRAY);
* gst_value_array_append_value (&v, &v2);
* g_value_unset (&v2);
* [ Repeat for as many v2's as your output channels - unset and reinit v2]
* g_object_set_property (G_OBJECT (audiomixmatrix), "matrix", &v);
* g_value_unset (&v);
* ]|
*
* ## Example launch line
* |[
* gst-launch-1.0 audiotestsrc ! audio/x-raw,channels=4 ! audiomixmatrix in-channels=4 out-channels=2 channel-mask=-1 matrix="<<(double)1, (double)0, (double)0, (double)0>, <0.0, 1.0, 0.0, 0.0>>" ! audio/x-raw,channels=2 ! autoaudiosink
* ]|
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstaudiomixmatrix.h"
#include <gst/gst.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
GST_DEBUG_CATEGORY_STATIC (audiomixmatrix_debug);
#define GST_CAT_DEFAULT audiomixmatrix_debug
/* GstAudioMixMatrix properties */
enum
{
PROP_0,
PROP_IN_CHANNELS,
PROP_OUT_CHANNELS,
PROP_MATRIX,
PROP_CHANNEL_MASK,
PROP_MODE
};
GType
gst_audio_mix_matrix_mode_get_type (void)
{
static GType gst_audio_mix_matrix_mode_type = 0;
static const GEnumValue gst_audio_mix_matrix_mode[] = {
{GST_AUDIO_MIX_MATRIX_MODE_MANUAL,
"Manual mode: please specify input/output channels and transformation matrix",
"manual"},
{GST_AUDIO_MIX_MATRIX_MODE_FIRST_CHANNELS,
"First channels mode: input/output channels are auto-negotiated, transformation matrix is a truncated identity matrix",
"first-channels"},
{0, NULL, NULL}
};
if (!gst_audio_mix_matrix_mode_type) {
gst_audio_mix_matrix_mode_type =
g_enum_register_static ("GstAudioMixMatrixModeType",
gst_audio_mix_matrix_mode);
}
return gst_audio_mix_matrix_mode_type;
}
static GstStaticPadTemplate gst_audio_mix_matrix_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS
("audio/x-raw, channels = [1, max], layout = (string) interleaved, format = (string) {"
GST_AUDIO_NE (F32) "," GST_AUDIO_NE (F64) "," GST_AUDIO_NE (S16) ","
GST_AUDIO_NE (S32) "}")
);
static GstStaticPadTemplate gst_audio_mix_matrix_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS
("audio/x-raw, channels = [1, max], layout = (string) interleaved, format = (string) {"
GST_AUDIO_NE (F32) "," GST_AUDIO_NE (F64) "," GST_AUDIO_NE (S16) ","
GST_AUDIO_NE (S32) "}")
);
static void gst_audio_mix_matrix_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_audio_mix_matrix_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_audio_mix_matrix_dispose (GObject * object);
static gboolean gst_audio_mix_matrix_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, gsize * size);
static gboolean gst_audio_mix_matrix_set_caps (GstBaseTransform * trans,
GstCaps * incaps, GstCaps * outcaps);
static GstFlowReturn gst_audio_mix_matrix_transform (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf);
static GstCaps *gst_audio_mix_matrix_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static GstCaps *gst_audio_mix_matrix_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstStateChangeReturn gst_audio_mix_matrix_change_state (GstElement *
element, GstStateChange transition);
G_DEFINE_TYPE (GstAudioMixMatrix, gst_audio_mix_matrix,
GST_TYPE_BASE_TRANSFORM);
GST_ELEMENT_REGISTER_DEFINE (audiomixmatrix, "audiomixmatrix", GST_RANK_NONE,
GST_TYPE_AUDIO_MIX_MATRIX);
static void
gst_audio_mix_matrix_class_init (GstAudioMixMatrixClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = (GstElementClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
GST_DEBUG_CATEGORY_INIT (audiomixmatrix_debug, "audiomixmatrix", 0,
"audiomixmatrix");
gst_element_class_set_static_metadata (element_class, "Matrix audio mix",
"Filter/Audio",
"Mixes a number of input channels into a number of output channels according to a transformation matrix",
"Vivia Nikolaidou <vivia@toolsonair.com>");
gobject_class->set_property = gst_audio_mix_matrix_set_property;
gobject_class->get_property = gst_audio_mix_matrix_get_property;
gobject_class->dispose = gst_audio_mix_matrix_dispose;
g_object_class_install_property (gobject_class, PROP_IN_CHANNELS,
g_param_spec_uint ("in-channels", "Input audio channels",
"How many audio channels we have on the input side",
0, 64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OUT_CHANNELS,
g_param_spec_uint ("out-channels", "Output audio channels",
"How many audio channels we have on the output side",
0, 64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MATRIX,
gst_param_spec_array ("matrix",
"Input/output channel matrix",
"Transformation matrix for input/output channels",
gst_param_spec_array ("matrix-in1", "rows", "rows",
g_param_spec_double ("matrix-in2", "cols", "cols",
-1, 1, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS),
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS),
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CHANNEL_MASK,
g_param_spec_uint64 ("channel-mask",
"Output channel mask",
"Output channel mask (-1 means \"default for these channels\")",
0, G_MAXUINT64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MODE,
g_param_spec_enum ("mode",
"Channel/matrix mode",
"Whether to auto-negotiate input/output channels and matrix",
GST_TYPE_AUDIO_MIX_MATRIX_MODE,
GST_AUDIO_MIX_MATRIX_MODE_MANUAL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_audio_mix_matrix_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_audio_mix_matrix_src_template));
trans_class->get_unit_size =
GST_DEBUG_FUNCPTR (gst_audio_mix_matrix_get_unit_size);
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_audio_mix_matrix_set_caps);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_audio_mix_matrix_transform);
trans_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_audio_mix_matrix_transform_caps);
trans_class->fixate_caps =
GST_DEBUG_FUNCPTR (gst_audio_mix_matrix_fixate_caps);
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_audio_mix_matrix_change_state);
gst_type_mark_as_plugin_api (GST_TYPE_AUDIO_MIX_MATRIX_MODE, 0);
}
static void
gst_audio_mix_matrix_init (GstAudioMixMatrix * self)
{
self->in_channels = 0;
self->out_channels = 0;
self->matrix = NULL;
self->channel_mask = 0;
self->s16_conv_matrix = NULL;
self->s32_conv_matrix = NULL;
self->mode = GST_AUDIO_MIX_MATRIX_MODE_MANUAL;
}
static void
gst_audio_mix_matrix_dispose (GObject * object)
{
GstAudioMixMatrix *self = GST_AUDIO_MIX_MATRIX (object);
if (self->matrix) {
g_free (self->matrix);
self->matrix = NULL;
}
G_OBJECT_CLASS (gst_audio_mix_matrix_parent_class)->dispose (object);
}
static void
gst_audio_mix_matrix_convert_s16_matrix (GstAudioMixMatrix * self)
{
gint i;
/* converted bits - input bits - sign - bits needed for channel */
self->shift_bytes = 32 - 16 - 1 - ceil (log (self->in_channels) / log (2));
if (self->s16_conv_matrix)
g_free (self->s16_conv_matrix);
self->s16_conv_matrix =
g_new (gint32, self->in_channels * self->out_channels);
for (i = 0; i < self->in_channels * self->out_channels; i++) {
self->s16_conv_matrix[i] =
(gint32) ((self->matrix[i]) * (1 << self->shift_bytes));
}
}
static void
gst_audio_mix_matrix_convert_s32_matrix (GstAudioMixMatrix * self)
{
gint i;
/* converted bits - input bits - sign - bits needed for channel */
self->shift_bytes = 64 - 32 - 1 - (gint) (log (self->in_channels) / log (2));
if (self->s32_conv_matrix)
g_free (self->s32_conv_matrix);
self->s32_conv_matrix =
g_new (gint64, self->in_channels * self->out_channels);
for (i = 0; i < self->in_channels * self->out_channels; i++) {
self->s32_conv_matrix[i] =
(gint64) ((self->matrix[i]) * (1 << self->shift_bytes));
}
}
static void
gst_audio_mix_matrix_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAudioMixMatrix *self = GST_AUDIO_MIX_MATRIX (object);
switch (prop_id) {
case PROP_IN_CHANNELS:
self->in_channels = g_value_get_uint (value);
if (self->matrix) {
gst_audio_mix_matrix_convert_s16_matrix (self);
gst_audio_mix_matrix_convert_s32_matrix (self);
}
break;
case PROP_OUT_CHANNELS:
self->out_channels = g_value_get_uint (value);
if (self->matrix) {
gst_audio_mix_matrix_convert_s16_matrix (self);
gst_audio_mix_matrix_convert_s32_matrix (self);
}
break;
case PROP_MATRIX:{
gint in, out;
if (self->matrix)
g_free (self->matrix);
self->matrix = g_new (gdouble, self->in_channels * self->out_channels);
g_return_if_fail (gst_value_array_get_size (value) == self->out_channels);
for (out = 0; out < self->out_channels; out++) {
const GValue *row = gst_value_array_get_value (value, out);
g_return_if_fail (gst_value_array_get_size (row) == self->in_channels);
for (in = 0; in < self->in_channels; in++) {
const GValue *itm;
gdouble coefficient;
itm = gst_value_array_get_value (row, in);
g_return_if_fail (G_VALUE_HOLDS_DOUBLE (itm));
coefficient = g_value_get_double (itm);
self->matrix[out * self->in_channels + in] = coefficient;
}
}
gst_audio_mix_matrix_convert_s16_matrix (self);
gst_audio_mix_matrix_convert_s32_matrix (self);
break;
}
case PROP_CHANNEL_MASK:
self->channel_mask = g_value_get_uint64 (value);
break;
case PROP_MODE:
self->mode = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_audio_mix_matrix_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAudioMixMatrix *self = GST_AUDIO_MIX_MATRIX (object);
switch (prop_id) {
case PROP_IN_CHANNELS:
g_value_set_uint (value, self->in_channels);
break;
case PROP_OUT_CHANNELS:
g_value_set_uint (value, self->out_channels);
break;
case PROP_MATRIX:{
gint in, out;
if (self->matrix == NULL)
break;
for (out = 0; out < self->out_channels; out++) {
GValue row = G_VALUE_INIT;
g_value_init (&row, GST_TYPE_ARRAY);
for (in = 0; in < self->in_channels; in++) {
GValue itm = G_VALUE_INIT;
g_value_init (&itm, G_TYPE_DOUBLE);
g_value_set_double (&itm, self->matrix[out * self->in_channels + in]);
gst_value_array_append_value (&row, &itm);
g_value_unset (&itm);
}
gst_value_array_append_value (value, &row);
g_value_unset (&row);
}
break;
}
case PROP_CHANNEL_MASK:
g_value_set_uint64 (value, self->channel_mask);
break;
case PROP_MODE:
g_value_set_enum (value, self->mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_audio_mix_matrix_change_state (GstElement * element,
GstStateChange transition)
{
GstAudioMixMatrix *self = GST_AUDIO_MIX_MATRIX (element);
GstStateChangeReturn s;
s = GST_ELEMENT_CLASS (gst_audio_mix_matrix_parent_class)->change_state
(element, transition);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
if (self->s16_conv_matrix) {
g_free (self->s16_conv_matrix);
self->s16_conv_matrix = NULL;
}
if (self->s32_conv_matrix) {
g_free (self->s32_conv_matrix);
self->s32_conv_matrix = NULL;
}
}
return s;
}
static GstFlowReturn
gst_audio_mix_matrix_transform (GstBaseTransform * vfilter,
GstBuffer * inbuf, GstBuffer * outbuf)
{
GstMapInfo inmap, outmap;
GstAudioMixMatrix *self = GST_AUDIO_MIX_MATRIX (vfilter);
gint in, out, sample;
guint inchannels = self->in_channels;
guint outchannels = self->out_channels;
gdouble *matrix = self->matrix;
if (!gst_buffer_map (inbuf, &inmap, GST_MAP_READ)) {
return GST_FLOW_ERROR;
}
if (!gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE)) {
gst_buffer_unmap (inbuf, &inmap);
return GST_FLOW_ERROR;
}
switch (self->format) {
case GST_AUDIO_FORMAT_F32LE:
case GST_AUDIO_FORMAT_F32BE:{
const gfloat *inarray;
gfloat *outarray;
guint n_samples = outmap.size / (sizeof (gfloat) * outchannels);
inarray = (gfloat *) inmap.data;
outarray = (gfloat *) outmap.data;
for (sample = 0; sample < n_samples; sample++) {
for (out = 0; out < outchannels; out++) {
gfloat outval = 0;
for (in = 0; in < inchannels; in++) {
outval +=
inarray[sample * inchannels +
in] * matrix[out * inchannels + in];
}
outarray[sample * outchannels + out] = outval;
}
}
break;
}
case GST_AUDIO_FORMAT_F64LE:
case GST_AUDIO_FORMAT_F64BE:{
const gdouble *inarray;
gdouble *outarray;
guint n_samples = outmap.size / (sizeof (gdouble) * outchannels);
inarray = (gdouble *) inmap.data;
outarray = (gdouble *) outmap.data;
for (sample = 0; sample < n_samples; sample++) {
for (out = 0; out < outchannels; out++) {
gdouble outval = 0;
for (in = 0; in < inchannels; in++) {
outval +=
inarray[sample * inchannels +
in] * matrix[out * inchannels + in];
}
outarray[sample * outchannels + out] = outval;
}
}
break;
}
case GST_AUDIO_FORMAT_S16LE:
case GST_AUDIO_FORMAT_S16BE:{
const gint16 *inarray;
gint16 *outarray;
guint n_samples = outmap.size / (sizeof (gint16) * outchannels);
guint n = self->shift_bytes;
gint32 *conv_matrix = self->s16_conv_matrix;
inarray = (gint16 *) inmap.data;
outarray = (gint16 *) outmap.data;
for (sample = 0; sample < n_samples; sample++) {
for (out = 0; out < outchannels; out++) {
gint32 outval = 0;
for (in = 0; in < inchannels; in++) {
outval += (gint32) (inarray[sample * inchannels + in] *
conv_matrix[out * inchannels + in]);
}
outarray[sample * outchannels + out] = (gint16) (outval >> n);
}
}
break;
}
case GST_AUDIO_FORMAT_S32LE:
case GST_AUDIO_FORMAT_S32BE:{
const gint32 *inarray;
gint32 *outarray;
guint n_samples = outmap.size / (sizeof (gint32) * outchannels);
guint n = self->shift_bytes;
gint64 *conv_matrix = self->s32_conv_matrix;
inarray = (gint32 *) inmap.data;
outarray = (gint32 *) outmap.data;
for (sample = 0; sample < n_samples; sample++) {
for (out = 0; out < outchannels; out++) {
gint64 outval = 0;
for (in = 0; in < inchannels; in++) {
outval += (gint64) (inarray[sample * inchannels + in] *
conv_matrix[out * inchannels + in]);
}
outarray[sample * outchannels + out] = (gint32) (outval >> n);
}
}
break;
}
default:
gst_buffer_unmap (inbuf, &inmap);
gst_buffer_unmap (outbuf, &outmap);
return GST_FLOW_NOT_SUPPORTED;
}
gst_buffer_unmap (inbuf, &inmap);
gst_buffer_unmap (outbuf, &outmap);
return GST_FLOW_OK;
}
static gboolean
gst_audio_mix_matrix_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, gsize * size)
{
GstAudioInfo info;
if (!gst_audio_info_from_caps (&info, caps))
return FALSE;
*size = GST_AUDIO_INFO_BPF (&info);
return TRUE;
}
static gboolean
gst_audio_mix_matrix_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstAudioMixMatrix *self = GST_AUDIO_MIX_MATRIX (trans);
GstAudioInfo info, out_info;
if (!gst_audio_info_from_caps (&info, incaps))
return FALSE;
if (!gst_audio_info_from_caps (&out_info, outcaps))
return FALSE;
self->format = info.finfo->format;
if (self->mode == GST_AUDIO_MIX_MATRIX_MODE_FIRST_CHANNELS) {
gint in, out;
self->in_channels = info.channels;
self->out_channels = out_info.channels;
self->matrix = g_new (gdouble, self->in_channels * self->out_channels);
for (out = 0; out < self->out_channels; out++) {
for (in = 0; in < self->in_channels; in++) {
self->matrix[out * self->in_channels + in] = (out == in);
}
}
} else if (!self->matrix || info.channels != self->in_channels ||
out_info.channels != self->out_channels) {
GST_ELEMENT_ERROR (self, LIBRARY, SETTINGS,
("Erroneous matrix detected"),
("Please enter a matrix with the correct input and output channels"));
return FALSE;
}
switch (self->format) {
case GST_AUDIO_FORMAT_S16LE:
case GST_AUDIO_FORMAT_S16BE:{
gst_audio_mix_matrix_convert_s16_matrix (self);
break;
}
case GST_AUDIO_FORMAT_S32LE:
case GST_AUDIO_FORMAT_S32BE:{
gst_audio_mix_matrix_convert_s32_matrix (self);
break;
}
default:
break;
}
return TRUE;
}
static GstCaps *
gst_audio_mix_matrix_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
{
GstAudioMixMatrix *self = GST_AUDIO_MIX_MATRIX (trans);
GstStructure *s, *s2;
guint capssize = gst_caps_get_size (othercaps);
gint i;
gint channels;
if (self->mode == GST_AUDIO_MIX_MATRIX_MODE_FIRST_CHANNELS) {
s2 = gst_caps_get_structure (caps, 0);
/* Try to keep channel configuration as much as possible */
if (gst_structure_get_int (s2, "channels", &channels)) {
gint mindiff = -1;
othercaps = gst_caps_make_writable (othercaps);
for (i = 0; i < capssize; i++) {
s = gst_caps_get_structure (othercaps, i);
if (!gst_structure_has_field (s, "channels")) {
mindiff = 0;
gst_structure_set (s, "channels", G_TYPE_INT, channels, NULL);
} else {
gint outchannels;
gint diff;
gst_structure_fixate_field_nearest_int (s, "channels", channels);
if (gst_structure_get_int (s, "channels", &outchannels)) {
diff = ABS (channels - outchannels);
if (mindiff < 0 || diff < mindiff)
mindiff = diff;
}
}
}
if (mindiff >= 0) {
for (i = 0; i < capssize; i++) {
gint outchannels, diff;
s = gst_caps_get_structure (othercaps, i);
if (gst_structure_get_int (s, "channels", &outchannels)) {
diff = ABS (channels - outchannels);
if (diff > mindiff) {
gst_caps_remove_structure (othercaps, i--);
capssize--;
}
}
}
}
}
}
if (gst_caps_is_empty (othercaps))
return othercaps;
othercaps =
GST_BASE_TRANSFORM_CLASS (gst_audio_mix_matrix_parent_class)->fixate_caps
(trans, direction, caps, othercaps);
s = gst_caps_get_structure (othercaps, 0);
if (!gst_structure_has_field (s, "channel-mask")) {
if (self->mode == GST_AUDIO_MIX_MATRIX_MODE_FIRST_CHANNELS ||
self->channel_mask == -1) {
gint channels;
g_assert (gst_structure_get_int (s, "channels", &channels));
gst_structure_set (s, "channel-mask", GST_TYPE_BITMASK,
gst_audio_channel_get_fallback_mask (channels), NULL);
} else {
gst_structure_set (s, "channel-mask", GST_TYPE_BITMASK,
self->channel_mask, NULL);
}
}
return othercaps;
}
static GstCaps *
gst_audio_mix_matrix_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstAudioMixMatrix *self = GST_AUDIO_MIX_MATRIX (trans);
GstCaps *outcaps = gst_caps_copy (caps);
GstCaps *ret;
GstStructure *s;
gint i;
guint capssize = gst_caps_get_size (outcaps);
if (self->mode == GST_AUDIO_MIX_MATRIX_MODE_FIRST_CHANNELS) {
for (i = 0; i < capssize; i++) {
s = gst_caps_get_structure (outcaps, i);
if (gst_structure_has_field (s, "channels")) {
gst_structure_remove_field (s, "channels");
}
if (gst_structure_has_field (s, "channel-mask")) {
gst_structure_remove_field (s, "channel-mask");
}
}
goto beach;
}
if (self->in_channels == 0 || self->out_channels == 0 || self->matrix == NULL) {
/* Not dispatching element error because we return empty caps anyway and
* we should let it fail to link. Additionally, the element error would be
* printed as WARN, so a possible gst-launch pipeline would appear to
* hang. */
GST_ERROR_OBJECT (self, "Invalid settings detected in manual mode. "
"Please specify in-channels, out-channels and matrix.");
return gst_caps_new_empty ();
}
if (self->in_channels == self->out_channels) {
goto beach;
}
for (i = 0; i < capssize; i++) {
s = gst_caps_get_structure (outcaps, i);
if (direction == GST_PAD_SRC) {
gst_structure_set (s, "channels", G_TYPE_INT, self->in_channels, NULL);
gst_structure_remove_field (s, "channel-mask");
} else if (direction == GST_PAD_SINK) {
gst_structure_set (s, "channels", G_TYPE_INT, self->out_channels,
"channel-mask", GST_TYPE_BITMASK, self->channel_mask, NULL);
} else {
g_assert_not_reached ();
}
}
beach:
if (filter) {
ret = gst_caps_intersect_full (filter, outcaps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (outcaps);
} else {
ret = outcaps;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return GST_ELEMENT_REGISTER (audiomixmatrix, plugin);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
audiomixmatrix,
"Audio matrix mix",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
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