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Original commit message from CVS: * ext/a52dec/gsta52dec.c: (gst_a52dec_channels), (gst_a52dec_push), (gst_a52dec_reneg), (gst_a52dec_loop), (plugin_init): * ext/alsa/gstalsa.c: (gst_alsa_get_caps): * ext/alsa/gstalsaplugin.c: (plugin_init): * ext/dts/gstdtsdec.c: (gst_dtsdec_channels), (gst_dtsdec_renegotiate), (gst_dtsdec_loop), (plugin_init): * ext/faad/gstfaad.c: (gst_faad_init), (gst_faad_chanpos_from_gst), (gst_faad_chanpos_to_gst), (gst_faad_sinkconnect), (gst_faad_srcgetcaps), (gst_faad_srcconnect), (gst_faad_chain), (gst_faad_change_state), (plugin_init): * ext/faad/gstfaad.h: * ext/vorbis/vorbis.c: (plugin_init): * ext/vorbis/vorbisdec.c: (vorbis_dec_chain): * gst-libs/gst/audio/Makefile.am: * gst-libs/gst/audio/audio.c: (plugin_init): * gst-libs/gst/audio/multichannel.c: (gst_audio_check_channel_positions), (gst_audio_get_channel_positions), (gst_audio_set_channel_positions), (gst_audio_set_structure_channel_positions_list), (add_list_to_struct), (gst_audio_set_caps_channel_positions_list), (gst_audio_fixate_channel_positions): * gst-libs/gst/audio/multichannel.h: * gst-libs/gst/audio/testchannels.c: (main): * gst/audioconvert/gstaudioconvert.c: (gst_audio_convert_class_init), (gst_audio_convert_init), (gst_audio_convert_dispose), (gst_audio_convert_getcaps), (gst_audio_convert_parse_caps), (gst_audio_convert_link), (gst_audio_convert_fixate), (gst_audio_convert_channels): * gst/audioconvert/plugin.c: (plugin_init): Surround sound support.
634 lines
22 KiB
C
634 lines
22 KiB
C
/* GStreamer Multichannel-Audio helper functions
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* (c) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "multichannel.h"
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#define GST_AUDIO_CHANNEL_POSITIONS_PROPERTY_NAME "channel-positions"
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/*
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* This function checks if basic assumptions apply:
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* - does each position occur at most once?
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* - do conflicting positions occur?
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* + front_mono vs. front_left/right
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* + front_center vs. front_left/right_of_center
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* + rear_center vs. rear_left/right
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* It also adds some hacks that 0.8.x needs for compatibility:
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* - if channels == 1, are we really mono?
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* - if channels == 2, are we really stereo?
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*/
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static gboolean
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gst_audio_check_channel_positions (const GstAudioChannelPosition * pos,
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gint channels)
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{
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gint i, n;
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struct
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{
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GstAudioChannelPosition pos1[2];
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GstAudioChannelPosition pos2[1];
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} conf[] = {
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/* front: mono <-> stereo */
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{ {
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
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GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}},
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/* front center: 2 <-> 1 */
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{ {
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, {
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}},
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/* rear: 2 <-> 1 */
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{ {
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {
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GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}}, { {
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GST_AUDIO_CHANNEL_POSITION_INVALID}}
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};
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/* check for invalid channel positions */
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for (n = 0; n < channels; n++) {
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if (pos[n] == GST_AUDIO_CHANNEL_POSITION_INVALID) {
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g_warning ("Position %d is invalid, not allowed", n);
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return FALSE;
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}
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}
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/* check for multiple position occurrences */
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for (i = GST_AUDIO_CHANNEL_POSITION_INVALID + 1;
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i < GST_AUDIO_CHANNEL_POSITION_NUM; i++) {
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gint count = 0;
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for (n = 0; n < channels; n++) {
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if (pos[n] == i)
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count++;
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}
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if (count > 1) {
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g_warning ("Channel position %d occurred %d times, not allowed",
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i, count);
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return FALSE;
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}
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}
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/* check for position conflicts */
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for (i = 0; conf[i].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; i++) {
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gboolean found1 = FALSE, found2 = FALSE;
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for (n = 0; n < channels; n++) {
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if (pos[n] == conf[i].pos1[0] || pos[n] == conf[i].pos1[1])
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found1 = TRUE;
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else if (pos[n] == conf[i].pos2[0])
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found2 = TRUE;
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}
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if (found1 && found2) {
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g_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]);
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return FALSE;
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}
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}
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/* 0.8.x evilry */
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if ((channels == 1 && pos[0] != GST_AUDIO_CHANNEL_POSITION_FRONT_MONO) ||
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(channels == 2 && (pos[0] != GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT ||
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pos[1] != GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT))) {
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g_warning ("0.8.x: channels=1 implies mono; channels=2 implies stereo");
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return FALSE;
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}
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return TRUE;
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}
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/**
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* gst_audio_get_channel_positions:
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* @str: A #GstStructure to retrieve channel positions from.
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*
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* Retrieves a number of (fixed!) audio channel positions from
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* the provided #GstStructure and returns it as a newly allocated
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* array. The caller should g_free () this array. The caller
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* should also check that the members in this #GstStructure are
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* indeed "fixed" before calling this function.
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*
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* Returns: a newly allocated array containing the channel
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* positions as provided in the given #GstStructure. Returns
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* NULL on error.
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*/
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GstAudioChannelPosition *
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gst_audio_get_channel_positions (GstStructure * str)
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{
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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;
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/* get number of channels, general type checkups */
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g_return_val_if_fail (str != NULL, NULL);
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res = gst_structure_get_int (str, "channels", &channels);
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g_return_val_if_fail (res, NULL);
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g_return_val_if_fail (channels > 0, NULL);
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pos_val_arr = gst_structure_get_value (str,
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GST_AUDIO_CHANNEL_POSITIONS_PROPERTY_NAME);
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/* The following checks are here to retain compatibility for plugins not
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* implementing this property. They expect that channels=1 implies mono
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* and channels=2 implies stereo, so we follow that.
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* This might be removed during 0.9.x. */
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if (!pos_val_arr && (channels == 1 || channels == 2)) {
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pos = g_new (GstAudioChannelPosition, channels);
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if (channels == 1) {
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pos[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_MONO;
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} else {
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pos[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
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pos[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
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}
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return pos;
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}
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g_return_val_if_fail (pos_val_arr != NULL, NULL);
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g_return_val_if_fail (gst_value_list_get_size (pos_val_arr) == channels,
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NULL);
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for (n = 0; n < channels; n++) {
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t = G_VALUE_TYPE (gst_value_list_get_value (pos_val_arr, n));
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g_return_val_if_fail (t == GST_TYPE_AUDIO_CHANNEL_POSITION, NULL);
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}
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/* ... and fill array */
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pos = g_new (GstAudioChannelPosition, channels);
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for (n = 0; n < channels; n++) {
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pos_val_entry = gst_value_list_get_value (pos_val_arr, n);
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pos[n] = g_value_get_enum (pos_val_entry);
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}
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if (!gst_audio_check_channel_positions (pos, channels)) {
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g_free (pos);
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return NULL;
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}
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return pos;
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}
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/**
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* gst_audio_set_channel_positions:
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* @str: A #GstStructure to retrieve channel positions from.
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* @pos: an array of channel positions. The number of members
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* in this array should be equal to the (fixed!) number
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* of the "channels" property in the given #GstStructure.
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*
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* Adds a "channel-positions" property to the given #GstStructure,
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* which will represent the channel positions as given in the
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* provided #GstAudioChannelPosition array.
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*/
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void
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gst_audio_set_channel_positions (GstStructure * str,
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const GstAudioChannelPosition * pos)
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{
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GValue pos_val_arr = { 0 }, pos_val_entry = {
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0};
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gint channels, n;
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gboolean res;
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/* get number of channels, checkups */
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g_return_if_fail (str != NULL);
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g_return_if_fail (pos != NULL);
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res = gst_structure_get_int (str, "channels", &channels);
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g_return_if_fail (res);
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g_return_if_fail (channels > 0);
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if (!gst_audio_check_channel_positions (pos, channels))
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return;
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/* build gvaluearray from positions */
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g_value_init (&pos_val_entry, GST_TYPE_AUDIO_CHANNEL_POSITION);
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g_value_init (&pos_val_arr, GST_TYPE_FIXED_LIST);
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for (n = 0; n < channels; n++) {
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g_value_set_enum (&pos_val_entry, pos[n]);
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gst_value_list_append_value (&pos_val_arr, &pos_val_entry);
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}
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g_value_unset (&pos_val_entry);
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/* add to structure */
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gst_structure_set_value (str,
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GST_AUDIO_CHANNEL_POSITIONS_PROPERTY_NAME, &pos_val_arr);
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g_value_unset (&pos_val_arr);
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}
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/**
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* gst_audio_set_structure_channel_positions_list:
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* @str: #GstStructure to set the list of channel positions
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* on.
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* @pos: the array containing one or more possible audio
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* channel positions that we should add in each value
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* of the array in the given structure.
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* @num_positions: the number of values in pos.
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*
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* Sets a (possibly non-fixed) list of possible audio channel
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* positions (given in pos) on the given structure. The
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* structure, after this function has been called, will contain
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* a "channel-positions" property with an array of the size of
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* the "channels" property value in the given structure (note
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* that this means that the channels property in the provided
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* structure should be fixed!). Each value in the array will
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* contain each of the values given in the pos array.
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*/
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void
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gst_audio_set_structure_channel_positions_list (GstStructure * str,
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const GstAudioChannelPosition * pos, gint num_positions)
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{
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gint channels, n, c;
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GValue pos_val_arr = { 0 }, pos_val_list = {
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0}, pos_val_entry = {
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0};
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gboolean res;
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/* get number of channels, general type checkups */
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g_return_if_fail (str != NULL);
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g_return_if_fail (num_positions > 0);
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g_return_if_fail (pos != NULL);
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res = gst_structure_get_int (str, "channels", &channels);
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g_return_if_fail (res);
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g_return_if_fail (channels > 0);
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/* 0.8.x: channels=1 or channels=2 is mono/stereo, no positions needed
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* there (we discard them anyway) */
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if (channels == 1 || channels == 2)
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return;
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/* create the array of lists */
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g_value_init (&pos_val_arr, GST_TYPE_FIXED_LIST);
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g_value_init (&pos_val_entry, GST_TYPE_AUDIO_CHANNEL_POSITION);
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for (n = 0; n < channels; n++) {
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g_value_init (&pos_val_list, GST_TYPE_LIST);
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for (c = 0; c < num_positions; c++) {
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g_value_set_enum (&pos_val_entry, pos[c]);
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gst_value_list_append_value (&pos_val_list, &pos_val_entry);
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}
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gst_value_list_append_value (&pos_val_arr, &pos_val_list);
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g_value_unset (&pos_val_list);
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}
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g_value_unset (&pos_val_entry);
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gst_structure_set_value (str, GST_AUDIO_CHANNEL_POSITIONS_PROPERTY_NAME,
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&pos_val_arr);
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g_value_unset (&pos_val_arr);
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}
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/*
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* Helper function for below. The structure will be conserved,
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* but might be cut down. Any additional structures that were
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* created will be stored in the returned caps.
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*/
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static GstCaps *
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add_list_to_struct (GstStructure * str,
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const GstAudioChannelPosition * pos, gint num_positions)
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{
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GstCaps *caps = gst_caps_new_empty ();
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const GValue *chan_val;
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chan_val = gst_structure_get_value (str, "channels");
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if (G_VALUE_TYPE (chan_val) == G_TYPE_INT) {
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gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
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} else if (G_VALUE_TYPE (chan_val) == GST_TYPE_LIST) {
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gint size;
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const GValue *sub_val;
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size = gst_value_list_get_size (chan_val);
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sub_val = gst_value_list_get_value (chan_val, 0);
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gst_structure_set_value (str, "channels", sub_val);
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gst_caps_append (caps, add_list_to_struct (str, pos, num_positions));
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while (--size > 0) {
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str = gst_structure_copy (str);
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sub_val = gst_value_list_get_value (chan_val, size);
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gst_structure_set_value (str, "channels", sub_val);
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gst_caps_append (caps, add_list_to_struct (str, pos, num_positions));
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gst_caps_append_structure (caps, str);
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}
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} else if (G_VALUE_TYPE (chan_val) == GST_TYPE_INT_RANGE) {
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gint min, max;
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min = gst_value_get_int_range_min (chan_val);
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max = gst_value_get_int_range_max (chan_val);
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gst_structure_set (str, "channels", G_TYPE_INT, min, NULL);
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gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
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for (++min; min < max; min++) {
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str = gst_structure_copy (str);
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gst_structure_set (str, "channels", G_TYPE_INT, min, NULL);
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gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
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gst_caps_append_structure (caps, str);
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}
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} else {
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g_warning ("Unknown value type for channels property");
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}
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return caps;
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}
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/**
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* gst_audio_set_caps_channel_positions_list:
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* @caps: #GstCaps to set the list of channel positions on.
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* @pos: the array containing one or more possible audio
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* channel positions that we should add in each value
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* of the array in the given structure.
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* @num_positions: the number of values in pos.
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*
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* Sets a (possibly non-fixed) list of possible audio channel
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* positions (given in pos) on the given caps. Each of the
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* structures of the caps, after this function has been called,
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* will contain a "channel-positions" property with an array.
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* Each value in the array will contain each of the values given
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* in the pos array. Note that the size of the caps might be
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* increased by this, since each structure with a "channel-
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* positions" property needs to have a fixed "channels" property.
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* The input caps is not required to have this.
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*/
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void
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gst_audio_set_caps_channel_positions_list (GstCaps * caps,
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const GstAudioChannelPosition * pos, gint num_positions)
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{
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gint size, n;
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/* get number of channels, general type checkups */
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g_return_if_fail (caps != NULL);
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g_return_if_fail (num_positions > 0);
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g_return_if_fail (pos != NULL);
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size = gst_caps_get_size (caps);
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for (n = 0; n < size; n++) {
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gst_caps_append (caps, add_list_to_struct (gst_caps_get_structure (caps,
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n), pos, num_positions));
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}
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}
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/**
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* gst_audio_fixate_channel_positions:
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* @str: a #GstStructure containing a (possibly unfixed)
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* "channel-positions" property.
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*
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* Custom fixate function. Elements that implement some sort of
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* channel conversion algorhithm should use this function for
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* fixating on GstAudioChannelPosition properties. It will take
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* care of equal channel positioning (left/right). Caller g_free()s
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* the return value. The input properties may be (and are supposed
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* to be) unfixed.
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* Note that this function is mostly a hack because we currently
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* have no way to add default fixation functions for new GTypes.
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*
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* Returns: fixed values that the caller could use as a fixed
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* set of #GstAudioChannelPosition values.
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*/
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GstAudioChannelPosition *
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gst_audio_fixate_channel_positions (GstStructure * str)
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{
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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;
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/*
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* We're going to do this cluelessly. We'll make an array of values that
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* conflict with each other and, for each iteration in this array, pick
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* either one until all unknown values are filled. This might not work in
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* corner cases but should work OK for the general case.
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*/
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struct
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{
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GstAudioChannelPosition pos1[2];
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GstAudioChannelPosition pos2[1];
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} conf[] = {
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/* front: mono <-> stereo */
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{ {
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
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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, 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_PROPERTY_NAME);
|
|
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_list_get_size (pos_val_arr) == channels,
|
|
NULL);
|
|
for (n = 0; n < channels; n++) {
|
|
t = G_VALUE_TYPE (gst_value_list_get_value (pos_val_arr, n));
|
|
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_list_get_value (pos_val_arr, n);
|
|
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_list_get_value (pos_val_arr,
|
|
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_list_get_value (pos_val_arr, n);
|
|
}
|
|
|
|
/* 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;
|
|
}
|