gstreamer/gst-libs/gst/audio/multichannel.c

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/* GStreamer Multichannel-Audio helper functions
* (c) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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.
*/
/**
* SECTION:gstmultichannel
* @short_description: Support for multichannel audio elements
*
* This module contains some helper functions and a enum to work with
* multichannel audio.
*/
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#ifdef HAVE_CONFIG_H
#include "config.h"
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#endif
#include "multichannel.h"
#define GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME "channel-positions"
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/**
* gst_audio_check_channel_positions:
* @pos: An array of #GstAudioChannelPosition.
* @channels: The number of elements in @pos.
*
* This functions checks if the given channel positions are valid. Channel
* positions are valid if:
* <itemizedlist>
* <listitem><para>No channel positions appears twice or all positions are %GST_AUDIO_CHANNEL_POSITION_NONE.
* </para></listitem>
* <listitem><para>Either all or none of the channel positions are %GST_AUDIO_CHANNEL_POSITION_NONE.
* </para></listitem>
* <listitem><para>%GST_AUDIO_CHANNEL_POSITION_FRONT_MONO and %GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT or %GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT don't appear together in the given positions.
* </para></listitem>
* </itemizedlist>
*
* Since: 0.10.20
*
* Returns: %TRUE if the given channel positions are valid
* and %FALSE otherwise.
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*/
gboolean
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gst_audio_check_channel_positions (const GstAudioChannelPosition * pos,
guint channels)
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{
gint i, n;
const struct
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{
const GstAudioChannelPosition pos1[2];
const GstAudioChannelPosition pos2[1];
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} conf[] = {
/* front: mono <-> stereo */
{ {
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
gst-libs/gst/audio/multichannel.c: Allow rear center together with rear left/right and other previously conflicting c... Original commit message from CVS: * gst-libs/gst/audio/multichannel.c: (gst_audio_check_channel_positions), (gst_audio_set_structure_channel_positions_list), (gst_audio_fixate_channel_positions): Allow rear center together with rear left/right and other previously conflicting channel positions. The reason why they weren't allowed was the channel mixing implementation in audioconvert. Also take this into account when fixing channel layouts. Allow setting channel positions for 1/2 channels when using gst_audio_set_structure_channel_position(). * gst/audioconvert/gstchannelmix.c: (gst_channel_mix_fill_compatible), (gst_channel_mix_detect_pos), (gst_channel_mix_fill_one_other), (gst_channel_mix_fill_others), (gst_channel_mix_fill_special), (gst_channel_mix_fill_matrix): Major rewrite of the channel mixing. We now allow previously conflicting channel positions to appear together (rear center and rear left/right for example). Fixes bug #533817. Rework the way channels are mixed together to take more possible channel positions into account, properly mix from/to side channels and don't assume that either center, left&right or nothing of a specific position is available anymore. * tests/check/elements/audioconvert.c: (GST_START_TEST): Adjust unit tests with non-standard 1/2 channel layouts to the more correct new behaviour. Add a unit test for 5.1->Stereo downmixing.
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GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}}, { {
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GST_AUDIO_CHANNEL_POSITION_INVALID}}
};
g_return_val_if_fail (pos != NULL, FALSE);
g_return_val_if_fail (channels > 0, FALSE);
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/* check for invalid channel positions */
for (n = 0; n < channels; n++) {
if (pos[n] <= GST_AUDIO_CHANNEL_POSITION_INVALID ||
pos[n] >= GST_AUDIO_CHANNEL_POSITION_NUM) {
GST_WARNING ("Channel position %d for channel %d is invalid", pos[n], n);
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return FALSE;
}
}
/* either all channel positions are NONE or all are defined,
* but having only some channel positions NONE and others not
* is not allowed */
if (pos[0] == GST_AUDIO_CHANNEL_POSITION_NONE) {
for (n = 1; n < channels; ++n) {
if (pos[n] != GST_AUDIO_CHANNEL_POSITION_NONE) {
GST_WARNING ("Either all channel positions must be defined, or all "
"be set to NONE, having only some defined is not allowed");
return FALSE;
}
}
/* all positions are NONE, we are done here */
return TRUE;
}
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/* check for multiple position occurrences */
for (i = GST_AUDIO_CHANNEL_POSITION_INVALID + 1;
i < GST_AUDIO_CHANNEL_POSITION_NUM; i++) {
gint count = 0;
for (n = 0; n < channels; n++) {
if (pos[n] == i)
count++;
}
/* NONE may not occur mixed with other channel positions */
if (i == GST_AUDIO_CHANNEL_POSITION_NONE && count > 0) {
GST_WARNING ("Either all channel positions must be defined, or all "
"be set to NONE, having only some defined is not allowed");
return FALSE;
}
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if (count > 1) {
GST_WARNING ("Channel position %d occurred %d times, not allowed",
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i, count);
return FALSE;
}
}
/* check for position conflicts */
for (i = 0; conf[i].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; i++) {
gboolean found1 = FALSE, found2 = FALSE;
for (n = 0; n < channels; n++) {
if (pos[n] == conf[i].pos1[0] || pos[n] == conf[i].pos1[1])
found1 = TRUE;
else if (pos[n] == conf[i].pos2[0])
found2 = TRUE;
}
if (found1 && found2) {
GST_WARNING ("Found conflicting channel positions %d/%d and %d",
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conf[i].pos1[0], conf[i].pos1[1], conf[i].pos2[0]);
return FALSE;
}
}
return TRUE;
}
/* FIXME: these default positions may or may not be correct. In any
* case, they are mostly just a fallback for buggy plugins, so it
* should not really matter too much */
#define NUM_DEF_CHANS 8
static const GstAudioChannelPosition
default_positions[NUM_DEF_CHANS][NUM_DEF_CHANS] = {
/* 1 channel */
{
GST_AUDIO_CHANNEL_POSITION_FRONT_MONO,
},
/* 2 channels */
{
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
},
/* 3 channels (2.1) */
{
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_LFE, /* or FRONT_CENTER for 3.0? */
},
/* 4 channels (4.0 or 3.1?) */
{
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
},
/* 5 channels */
{
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
},
/* 6 channels */
{
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_LFE,
},
/* 7 channels */
{
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_LFE,
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
},
/* 8 channels */
{
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_LFE,
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
}
};
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/**
* gst_audio_get_channel_positions:
* @str: A #GstStructure to retrieve channel positions from.
*
* Retrieves a number of (fixed!) audio channel positions from
* the provided #GstStructure and returns it as a newly allocated
* array. The caller should g_free () this array. The caller
* should also check that the members in this #GstStructure are
* indeed "fixed" before calling this function.
*
* Returns: a newly allocated array containing the channel
* positions as provided in the given #GstStructure. Returns
* NULL on error.
*/
GstAudioChannelPosition *
gst_audio_get_channel_positions (GstStructure * str)
{
GstAudioChannelPosition *pos;
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gint channels, n;
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const GValue *pos_val_arr, *pos_val_entry;
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gboolean res;
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GType t;
/* get number of channels, general type checkups */
g_return_val_if_fail (str != NULL, NULL);
res = gst_structure_get_int (str, "channels", &channels);
g_return_val_if_fail (res, NULL);
g_return_val_if_fail (channels > 0, NULL);
pos_val_arr = gst_structure_get_value (str,
GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME);
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/* The following checks are here to retain compatibility for plugins not
* implementing this field. They expect that channels=1 implies mono
* and channels=2 implies stereo, so we follow that. */
if (pos_val_arr == NULL) {
/* channel layouts for 1 and 2 channels are implicit, don't warn */
if (channels > 2) {
g_warning ("Failed to retrieve channel layout from caps. This usually "
"means there is a GStreamer element that does not implement "
"multichannel audio correctly. Please file a bug.");
}
/* just return some default channel layout if we have one */
if (channels >= 1 && channels <= NUM_DEF_CHANS) {
const GstAudioChannelPosition *p;
p = default_positions[channels - 1];
return g_memdup (p, channels * sizeof (GstAudioChannelPosition));
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}
return NULL;
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}
g_return_val_if_fail (gst_value_array_get_size (pos_val_arr) == channels,
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NULL);
for (n = 0; n < channels; n++) {
t = G_VALUE_TYPE (gst_value_array_get_value (pos_val_arr, n));
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g_return_val_if_fail (t == GST_TYPE_AUDIO_CHANNEL_POSITION, NULL);
}
/* ... and fill array */
pos = g_new (GstAudioChannelPosition, channels);
for (n = 0; n < channels; n++) {
pos_val_entry = gst_value_array_get_value (pos_val_arr, n);
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pos[n] = g_value_get_enum (pos_val_entry);
}
if (!gst_audio_check_channel_positions (pos, channels)) {
g_free (pos);
return NULL;
}
return pos;
}
/**
* gst_audio_set_channel_positions:
* @str: A #GstStructure to set channel positions on.
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* @pos: an array of channel positions. The number of members
* in this array should be equal to the (fixed!) number
* of the "channels" field in the given #GstStructure.
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*
* Adds a "channel-positions" field to the given #GstStructure,
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* which will represent the channel positions as given in the
* provided #GstAudioChannelPosition array.
*/
void
gst_audio_set_channel_positions (GstStructure * str,
const GstAudioChannelPosition * pos)
{
GValue pos_val_arr = { 0 }, pos_val_entry = {
0};
gint channels, n;
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gboolean res;
/* get number of channels, checkups */
g_return_if_fail (str != NULL);
g_return_if_fail (pos != NULL);
res = gst_structure_get_int (str, "channels", &channels);
g_return_if_fail (res);
g_return_if_fail (channels > 0);
if (!gst_audio_check_channel_positions (pos, channels))
return;
/* build gvaluearray from positions */
g_value_init (&pos_val_entry, GST_TYPE_AUDIO_CHANNEL_POSITION);
g_value_init (&pos_val_arr, GST_TYPE_ARRAY);
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for (n = 0; n < channels; n++) {
g_value_set_enum (&pos_val_entry, pos[n]);
gst_value_array_append_value (&pos_val_arr, &pos_val_entry);
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}
g_value_unset (&pos_val_entry);
/* add to structure */
gst_structure_set_value (str,
GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME, &pos_val_arr);
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g_value_unset (&pos_val_arr);
}
/**
* gst_audio_set_structure_channel_positions_list:
* @str: #GstStructure to set the list of channel positions
* on.
* @pos: the array containing one or more possible audio
* channel positions that we should add in each value
* of the array in the given structure.
* @num_positions: the number of values in pos.
*
* Sets a (possibly non-fixed) list of possible audio channel
* positions (given in pos) on the given structure. The
* structure, after this function has been called, will contain
* a "channel-positions" field with an array of the size of
* the "channels" field value in the given structure (note
* that this means that the channels field in the provided
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* structure should be fixed!). Each value in the array will
* contain each of the values given in the pos array.
*/
void
gst_audio_set_structure_channel_positions_list (GstStructure * str,
const GstAudioChannelPosition * pos, gint num_positions)
{
gint channels, n, c;
GValue pos_val_arr = { 0 }, pos_val_list = {
0}, pos_val_entry = {
0};
gboolean res;
/* get number of channels, general type checkups */
g_return_if_fail (str != NULL);
g_return_if_fail (num_positions > 0);
g_return_if_fail (pos != NULL);
res = gst_structure_get_int (str, "channels", &channels);
g_return_if_fail (res);
g_return_if_fail (channels > 0);
/* create the array of lists */
g_value_init (&pos_val_arr, GST_TYPE_ARRAY);
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g_value_init (&pos_val_entry, GST_TYPE_AUDIO_CHANNEL_POSITION);
for (n = 0; n < channels; n++) {
g_value_init (&pos_val_list, GST_TYPE_LIST);
for (c = 0; c < num_positions; c++) {
g_value_set_enum (&pos_val_entry, pos[c]);
gst_value_list_append_value (&pos_val_list, &pos_val_entry);
}
gst_value_array_append_value (&pos_val_arr, &pos_val_list);
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g_value_unset (&pos_val_list);
}
g_value_unset (&pos_val_entry);
gst_structure_set_value (str, GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME,
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&pos_val_arr);
g_value_unset (&pos_val_arr);
}
/*
* Helper function for below. The structure will be conserved,
* but might be cut down. Any additional structures that were
* created will be stored in the returned caps.
*/
static GstCaps *
add_list_to_struct (GstStructure * str,
const GstAudioChannelPosition * pos, gint num_positions)
{
GstCaps *caps = gst_caps_new_empty ();
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const GValue *chan_val;
chan_val = gst_structure_get_value (str, "channels");
if (G_VALUE_TYPE (chan_val) == G_TYPE_INT) {
gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
} else if (G_VALUE_TYPE (chan_val) == GST_TYPE_LIST) {
gint size;
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const GValue *sub_val;
size = gst_value_list_get_size (chan_val);
sub_val = gst_value_list_get_value (chan_val, 0);
gst_structure_set_value (str, "channels", sub_val);
gst_caps_append (caps, add_list_to_struct (str, pos, num_positions));
while (--size > 0) {
str = gst_structure_copy (str);
sub_val = gst_value_list_get_value (chan_val, size);
gst_structure_set_value (str, "channels", sub_val);
gst_caps_append (caps, add_list_to_struct (str, pos, num_positions));
gst_caps_append_structure (caps, str);
}
} else if (G_VALUE_TYPE (chan_val) == GST_TYPE_INT_RANGE) {
gint min, max;
min = gst_value_get_int_range_min (chan_val);
max = gst_value_get_int_range_max (chan_val);
gst_structure_set (str, "channels", G_TYPE_INT, min, NULL);
gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
for (++min; min < max; min++) {
str = gst_structure_copy (str);
gst_structure_set (str, "channels", G_TYPE_INT, min, NULL);
gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
gst_caps_append_structure (caps, str);
}
} else {
g_warning ("Unexpected value type '%s' for channels field",
GST_STR_NULL (g_type_name (G_VALUE_TYPE (chan_val))));
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}
return caps;
}
/**
* gst_audio_set_caps_channel_positions_list:
* @caps: #GstCaps to set the list of channel positions on.
* @pos: the array containing one or more possible audio
* channel positions that we should add in each value
* of the array in the given structure.
* @num_positions: the number of values in pos.
*
* Sets a (possibly non-fixed) list of possible audio channel
* positions (given in pos) on the given caps. Each of the
* structures of the caps, after this function has been called,
* will contain a "channel-positions" field with an array.
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* Each value in the array will contain each of the values given
* in the pos array. Note that the size of the caps might be
* increased by this, since each structure with a "channel-
* positions" field needs to have a fixed "channels" field.
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* The input caps is not required to have this.
*/
void
gst_audio_set_caps_channel_positions_list (GstCaps * caps,
const GstAudioChannelPosition * pos, gint num_positions)
{
gint size, n;
/* get number of channels, general type checkups */
g_return_if_fail (caps != NULL);
g_return_if_fail (num_positions > 0);
g_return_if_fail (pos != NULL);
size = gst_caps_get_size (caps);
for (n = 0; n < size; n++) {
gst_caps_append (caps, add_list_to_struct (gst_caps_get_structure (caps,
n), pos, num_positions));
}
}
/**
* gst_audio_fixate_channel_positions:
* @str: a #GstStructure containing a (possibly unfixed)
* "channel-positions" field.
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*
* Custom fixate function. Elements that implement some sort of
* channel conversion algorithm should use this function for
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* fixating on GstAudioChannelPosition properties. It will take
* care of equal channel positioning (left/right). Caller g_free()s
* the return value. The input properties may be (and are supposed
* to be) unfixed.
* Note that this function is mostly a hack because we currently
* have no way to add default fixation functions for new GTypes.
*
* Returns: fixed values that the caller could use as a fixed
* set of #GstAudioChannelPosition values.
*/
GstAudioChannelPosition *
gst_audio_fixate_channel_positions (GstStructure * str)
{
GstAudioChannelPosition *pos;
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gint channels, n, num_unfixed = 0, i, c;
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const GValue *pos_val_arr, *pos_val_entry, *pos_val;
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gboolean res, is_stereo = TRUE;
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GType t;
/*
* We're going to do this cluelessly. We'll make an array of values that
* conflict with each other and, for each iteration in this array, pick
* either one until all unknown values are filled. This might not work in
* corner cases but should work OK for the general case.
*/
const struct
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{
const GstAudioChannelPosition pos1[2];
const GstAudioChannelPosition pos2[1];
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} conf[] = {
/* front: mono <-> stereo */
gst-libs/gst/audio/multichannel.c: Allow rear center together with rear left/right and other previously conflicting c... Original commit message from CVS: * gst-libs/gst/audio/multichannel.c: (gst_audio_check_channel_positions), (gst_audio_set_structure_channel_positions_list), (gst_audio_fixate_channel_positions): Allow rear center together with rear left/right and other previously conflicting channel positions. The reason why they weren't allowed was the channel mixing implementation in audioconvert. Also take this into account when fixing channel layouts. Allow setting channel positions for 1/2 channels when using gst_audio_set_structure_channel_position(). * gst/audioconvert/gstchannelmix.c: (gst_channel_mix_fill_compatible), (gst_channel_mix_detect_pos), (gst_channel_mix_fill_one_other), (gst_channel_mix_fill_others), (gst_channel_mix_fill_special), (gst_channel_mix_fill_matrix): Major rewrite of the channel mixing. We now allow previously conflicting channel positions to appear together (rear center and rear left/right for example). Fixes bug #533817. Rework the way channels are mixed together to take more possible channel positions into account, properly mix from/to side channels and don't assume that either center, left&right or nothing of a specific position is available anymore. * tests/check/elements/audioconvert.c: (GST_START_TEST): Adjust unit tests with non-standard 1/2 channel layouts to the more correct new behaviour. Add a unit test for 5.1->Stereo downmixing.
2008-05-29 11:34:09 +00:00
{
{
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
gst-libs/gst/audio/multichannel.c: Allow rear center together with rear left/right and other previously conflicting c... Original commit message from CVS: * gst-libs/gst/audio/multichannel.c: (gst_audio_check_channel_positions), (gst_audio_set_structure_channel_positions_list), (gst_audio_fixate_channel_positions): Allow rear center together with rear left/right and other previously conflicting channel positions. The reason why they weren't allowed was the channel mixing implementation in audioconvert. Also take this into account when fixing channel layouts. Allow setting channel positions for 1/2 channels when using gst_audio_set_structure_channel_position(). * gst/audioconvert/gstchannelmix.c: (gst_channel_mix_fill_compatible), (gst_channel_mix_detect_pos), (gst_channel_mix_fill_one_other), (gst_channel_mix_fill_others), (gst_channel_mix_fill_special), (gst_channel_mix_fill_matrix): Major rewrite of the channel mixing. We now allow previously conflicting channel positions to appear together (rear center and rear left/right for example). Fixes bug #533817. Rework the way channels are mixed together to take more possible channel positions into account, properly mix from/to side channels and don't assume that either center, left&right or nothing of a specific position is available anymore. * tests/check/elements/audioconvert.c: (GST_START_TEST): Adjust unit tests with non-standard 1/2 channel layouts to the more correct new behaviour. Add a unit test for 5.1->Stereo downmixing.
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GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}}, { {
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, {
gst-libs/gst/audio/multichannel.c: Allow rear center together with rear left/right and other previously conflicting c... Original commit message from CVS: * gst-libs/gst/audio/multichannel.c: (gst_audio_check_channel_positions), (gst_audio_set_structure_channel_positions_list), (gst_audio_fixate_channel_positions): Allow rear center together with rear left/right and other previously conflicting channel positions. The reason why they weren't allowed was the channel mixing implementation in audioconvert. Also take this into account when fixing channel layouts. Allow setting channel positions for 1/2 channels when using gst_audio_set_structure_channel_position(). * gst/audioconvert/gstchannelmix.c: (gst_channel_mix_fill_compatible), (gst_channel_mix_detect_pos), (gst_channel_mix_fill_one_other), (gst_channel_mix_fill_others), (gst_channel_mix_fill_special), (gst_channel_mix_fill_matrix): Major rewrite of the channel mixing. We now allow previously conflicting channel positions to appear together (rear center and rear left/right for example). Fixes bug #533817. Rework the way channels are mixed together to take more possible channel positions into account, properly mix from/to side channels and don't assume that either center, left&right or nothing of a specific position is available anymore. * tests/check/elements/audioconvert.c: (GST_START_TEST): Adjust unit tests with non-standard 1/2 channel layouts to the more correct new behaviour. Add a unit test for 5.1->Stereo downmixing.
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GST_AUDIO_CHANNEL_POSITION_INVALID}}, { {
GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, {
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}}, { {
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {
gst-libs/gst/audio/multichannel.c: Allow rear center together with rear left/right and other previously conflicting c... Original commit message from CVS: * gst-libs/gst/audio/multichannel.c: (gst_audio_check_channel_positions), (gst_audio_set_structure_channel_positions_list), (gst_audio_fixate_channel_positions): Allow rear center together with rear left/right and other previously conflicting channel positions. The reason why they weren't allowed was the channel mixing implementation in audioconvert. Also take this into account when fixing channel layouts. Allow setting channel positions for 1/2 channels when using gst_audio_set_structure_channel_position(). * gst/audioconvert/gstchannelmix.c: (gst_channel_mix_fill_compatible), (gst_channel_mix_detect_pos), (gst_channel_mix_fill_one_other), (gst_channel_mix_fill_others), (gst_channel_mix_fill_special), (gst_channel_mix_fill_matrix): Major rewrite of the channel mixing. We now allow previously conflicting channel positions to appear together (rear center and rear left/right for example). Fixes bug #533817. Rework the way channels are mixed together to take more possible channel positions into account, properly mix from/to side channels and don't assume that either center, left&right or nothing of a specific position is available anymore. * tests/check/elements/audioconvert.c: (GST_START_TEST): Adjust unit tests with non-standard 1/2 channel layouts to the more correct new behaviour. Add a unit test for 5.1->Stereo downmixing.
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GST_AUDIO_CHANNEL_POSITION_INVALID}}, { {
GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, {
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GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}}, { {
GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, {
GST_AUDIO_CHANNEL_POSITION_LFE}}, { {
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT}, {
GST_AUDIO_CHANNEL_POSITION_INVALID}}, { {
GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, {
GST_AUDIO_CHANNEL_POSITION_INVALID}}
};
struct
{
gint num_opt[3];
guint num_opts[3];
gboolean is_fixed[3];
gint choice; /* -1 is none, 0 is the two, 1 is the one */
} opt;
/* get number of channels, general type checkups */
g_return_val_if_fail (str != NULL, NULL);
res = gst_structure_get_int (str, "channels", &channels);
g_return_val_if_fail (res, NULL);
g_return_val_if_fail (channels > 0, NULL);
/* 0.8.x mono/stereo checks */
pos_val_arr = gst_structure_get_value (str,
GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME);
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if (!pos_val_arr && (channels == 1 || channels == 2)) {
pos = g_new (GstAudioChannelPosition, channels);
if (channels == 1) {
pos[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_MONO;
} else {
pos[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
pos[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
}
return pos;
}
g_return_val_if_fail (pos_val_arr != NULL, NULL);
g_return_val_if_fail (gst_value_array_get_size (pos_val_arr) == channels,
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NULL);
for (n = 0; n < channels; n++) {
t = G_VALUE_TYPE (gst_value_array_get_value (pos_val_arr, n));
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g_return_val_if_fail (t == GST_TYPE_LIST ||
t == GST_TYPE_AUDIO_CHANNEL_POSITION, NULL);
}
/* all unknown, to start with */
pos = g_new (GstAudioChannelPosition, channels);
for (n = 0; n < channels; n++)
pos[n] = GST_AUDIO_CHANNEL_POSITION_INVALID;
num_unfixed = channels;
/* Iterate the array of conflicting values */
for (i = 0; conf[i].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID ||
conf[i].pos2[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; i++) {
/* front/center only important if not mono (obviously) */
if (conf[i].pos1[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER &&
!is_stereo)
continue;
/* init values */
for (n = 0; n < 3; n++) {
opt.num_opt[n] = -1;
opt.num_opts[n] = -1;
opt.is_fixed[n] = FALSE;
}
/* Now, we'll see for each channel if it allows for any of the values in
* the set of conflicting audio channel positions and keep scores. */
for (n = 0; n < channels; n++) {
/* if the channel is already taken, don't bother */
if (pos[n] != GST_AUDIO_CHANNEL_POSITION_INVALID)
continue;
pos_val_entry = gst_value_array_get_value (pos_val_arr, n);
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t = G_VALUE_TYPE (pos_val_entry);
if (t == GST_TYPE_LIST) {
/* This algorhythm is suboptimal. */
for (c = 0; c < gst_value_list_get_size (pos_val_entry); c++) {
pos_val = gst_value_list_get_value (pos_val_entry, c);
if (g_value_get_enum (pos_val) == conf[i].pos1[0] &&
opt.num_opts[0] > gst_value_list_get_size (pos_val_entry) &&
!opt.is_fixed[0]) {
/* Now test if the old position of num_opt[0] also allows for
* the other channel (which was skipped previously). If so,
* keep score. */
if (opt.num_opt[0] != -1) {
gint c1;
pos_val_entry = gst_value_array_get_value (pos_val_arr,
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opt.num_opt[0]);
if (G_VALUE_TYPE (pos_val_entry) == GST_TYPE_LIST) {
for (c1 = 0; c1 < gst_value_list_get_size (pos_val_entry); c1++) {
pos_val = gst_value_list_get_value (pos_val_entry, c1);
if (g_value_get_enum (pos_val) == conf[i].pos1[1] &&
opt.num_opts[1] > opt.num_opts[0] && !opt.is_fixed[1]) {
opt.num_opts[1] = opt.num_opts[0];
opt.num_opt[1] = opt.num_opt[0];
}
}
pos_val = gst_value_list_get_value (pos_val_entry, c);
}
pos_val_entry = gst_value_array_get_value (pos_val_arr, n);
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}
/* and save values */
opt.num_opts[0] = gst_value_list_get_size (pos_val_entry);
opt.num_opt[0] = n;
} else if (g_value_get_enum (pos_val) == conf[i].pos1[1] &&
opt.num_opts[1] > gst_value_list_get_size (pos_val_entry) &&
!opt.is_fixed[1] && n != opt.num_opt[0]) {
opt.num_opts[1] = gst_value_list_get_size (pos_val_entry);
opt.num_opt[1] = n;
}
/* 2 goes separately, because 0/1 vs. 2 are separate */
if (g_value_get_enum (pos_val) == conf[i].pos2[0] &&
opt.num_opts[2] > gst_value_list_get_size (pos_val_entry) &&
!opt.is_fixed[2]) {
opt.num_opts[2] = gst_value_list_get_size (pos_val_entry);
opt.num_opt[2] = n;
}
}
} else {
if (g_value_get_enum (pos_val_entry) == conf[i].pos1[0]) {
opt.num_opt[0] = n;
opt.is_fixed[0] = TRUE;
} else if (g_value_get_enum (pos_val_entry) == conf[i].pos1[1]) {
opt.num_opt[1] = n;
opt.is_fixed[1] = TRUE;
} else if (g_value_get_enum (pos_val_entry) == conf[i].pos2[0]) {
opt.num_opt[2] = n;
opt.is_fixed[2] = TRUE;
}
}
}
/* check our results and choose either one */
if ((opt.is_fixed[0] || opt.is_fixed[1]) && opt.is_fixed[2]) {
g_warning ("Pre-fixated on both %d/%d and %d - conflict!",
conf[i].pos1[0], conf[i].pos1[1], conf[i].pos2[0]);
g_free (pos);
return NULL;
} else if ((opt.is_fixed[0] && opt.num_opt[1] == -1) ||
(opt.is_fixed[1] && opt.num_opt[0] == -1)) {
g_warning ("Pre-fixated one side, but other side n/a of %d/%d",
conf[i].pos1[0], conf[i].pos1[1]);
g_free (pos);
return NULL;
} else if (opt.is_fixed[0] || opt.is_fixed[1]) {
opt.choice = 0;
} else if (opt.is_fixed[2]) {
opt.choice = 1;
} else if (opt.num_opt[0] != -1 && opt.num_opt[1] != -1) {
opt.choice = 0;
} else if (opt.num_opt[2] != -1) {
opt.choice = 1;
} else {
opt.choice = -1;
}
/* stereo? Note that we keep is_stereo to TRUE if we didn't decide on
* any arrangement. The mono/stereo channels might be handled elsewhere
* which is clearly outside the scope of this element, so we cannot
* know and expect the application to handle that then. */
if (conf[i].pos2[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_MONO &&
opt.choice == 1) {
is_stereo = FALSE;
}
/* now actually decide what we'll do and fixate on that */
if (opt.choice == 0) {
g_assert (conf[i].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID &&
conf[i].pos1[1] != GST_AUDIO_CHANNEL_POSITION_INVALID);
pos[opt.num_opt[0]] = conf[i].pos1[0];
pos[opt.num_opt[1]] = conf[i].pos1[1];
num_unfixed -= 2;
} else if (opt.choice == 1) {
g_assert (conf[i].pos2[0] != GST_AUDIO_CHANNEL_POSITION_INVALID);
pos[opt.num_opt[2]] = conf[i].pos2[0];
num_unfixed--;
}
}
/* safety check */
if (num_unfixed > 0) {
g_warning ("%d unfixed channel positions left after fixation!",
num_unfixed);
g_free (pos);
return NULL;
}
if (!gst_audio_check_channel_positions (pos, channels)) {
g_free (pos);
return NULL;
}
return pos;
}