1 /* GStreamer Multichannel-Audio helper functions
2 * (c) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 * SECTION:gstmultichannel
21 * @short_description: Support for multichannel audio elements
23 * This module contains some helper functions and a enum to work with
31 #include "multichannel.h"
33 #define GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME "channel-positions"
36 * gst_audio_check_channel_positions:
37 * @pos: An array of #GstAudioChannelPosition.
38 * @channels: The number of elements in @pos.
40 * This functions checks if the given channel positions are valid. Channel
41 * positions are valid if:
43 * <listitem><para>No channel positions appears twice or all positions are %GST_AUDIO_CHANNEL_POSITION_NONE.
45 * <listitem><para>Either all or none of the channel positions are %GST_AUDIO_CHANNEL_POSITION_NONE.
47 * <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.
53 * Returns: %TRUE if the given channel positions are valid
54 * and %FALSE otherwise.
57 gst_audio_check_channel_positions (const GstAudioChannelPosition * pos,
64 const GstAudioChannelPosition pos1[2];
65 const GstAudioChannelPosition pos2[1];
67 /* front: mono <-> stereo */
69 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
70 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
71 GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}}, { {
72 GST_AUDIO_CHANNEL_POSITION_INVALID}}
75 g_return_val_if_fail (pos != NULL, FALSE);
76 g_return_val_if_fail (channels > 0, FALSE);
78 /* check for invalid channel positions */
79 for (n = 0; n < channels; n++) {
80 if (pos[n] <= GST_AUDIO_CHANNEL_POSITION_INVALID ||
81 pos[n] >= GST_AUDIO_CHANNEL_POSITION_NUM) {
82 GST_WARNING ("Channel position %d for channel %d is invalid", pos[n], n);
87 /* either all channel positions are NONE or all are defined,
88 * but having only some channel positions NONE and others not
90 if (pos[0] == GST_AUDIO_CHANNEL_POSITION_NONE) {
91 for (n = 1; n < channels; ++n) {
92 if (pos[n] != GST_AUDIO_CHANNEL_POSITION_NONE) {
93 GST_WARNING ("Either all channel positions must be defined, or all "
94 "be set to NONE, having only some defined is not allowed");
98 /* all positions are NONE, we are done here */
102 /* check for multiple position occurrences */
103 for (i = GST_AUDIO_CHANNEL_POSITION_INVALID + 1;
104 i < GST_AUDIO_CHANNEL_POSITION_NUM; i++) {
107 for (n = 0; n < channels; n++) {
112 /* NONE may not occur mixed with other channel positions */
113 if (i == GST_AUDIO_CHANNEL_POSITION_NONE && count > 0) {
114 GST_WARNING ("Either all channel positions must be defined, or all "
115 "be set to NONE, having only some defined is not allowed");
120 GST_WARNING ("Channel position %d occurred %d times, not allowed",
126 /* check for position conflicts */
127 for (i = 0; conf[i].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; i++) {
128 gboolean found1 = FALSE, found2 = FALSE;
130 for (n = 0; n < channels; n++) {
131 if (pos[n] == conf[i].pos1[0] || pos[n] == conf[i].pos1[1])
133 else if (pos[n] == conf[i].pos2[0])
137 if (found1 && found2) {
138 GST_WARNING ("Found conflicting channel positions %d/%d and %d",
139 conf[i].pos1[0], conf[i].pos1[1], conf[i].pos2[0]);
147 /* FIXME: these default positions may or may not be correct. In any
148 * case, they are mostly just a fallback for buggy plugins, so it
149 * should not really matter too much */
150 #define NUM_DEF_CHANS 8
151 static const GstAudioChannelPosition
152 default_positions[NUM_DEF_CHANS][NUM_DEF_CHANS] = {
155 GST_AUDIO_CHANNEL_POSITION_FRONT_MONO,
159 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
160 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
162 /* 3 channels (2.1) */
164 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
165 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
166 GST_AUDIO_CHANNEL_POSITION_LFE, /* or FRONT_CENTER for 3.0? */
168 /* 4 channels (4.0 or 3.1?) */
170 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
171 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
172 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
173 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
177 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
178 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
179 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
180 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
181 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
185 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
186 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
187 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
188 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
189 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
190 GST_AUDIO_CHANNEL_POSITION_LFE,
194 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
195 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
196 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
197 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
198 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
199 GST_AUDIO_CHANNEL_POSITION_LFE,
200 GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
204 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
205 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
206 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
207 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
208 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
209 GST_AUDIO_CHANNEL_POSITION_LFE,
210 GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
211 GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
216 * gst_audio_get_channel_positions:
217 * @str: A #GstStructure to retrieve channel positions from.
219 * Retrieves a number of (fixed!) audio channel positions from
220 * the provided #GstStructure and returns it as a newly allocated
221 * array. The caller should g_free () this array. The caller
222 * should also check that the members in this #GstStructure are
223 * indeed "fixed" before calling this function.
225 * Returns: a newly allocated array containing the channel
226 * positions as provided in the given #GstStructure. Returns
230 GstAudioChannelPosition *
231 gst_audio_get_channel_positions (GstStructure * str)
233 GstAudioChannelPosition *pos;
237 const GValue *pos_val_arr, *pos_val_entry;
243 /* get number of channels, general type checkups */
244 g_return_val_if_fail (str != NULL, NULL);
245 res = gst_structure_get_int (str, "channels", &channels);
246 g_return_val_if_fail (res, NULL);
247 g_return_val_if_fail (channels > 0, NULL);
248 pos_val_arr = gst_structure_get_value (str,
249 GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME);
251 /* The following checks are here to retain compatibility for plugins not
252 * implementing this field. They expect that channels=1 implies mono
253 * and channels=2 implies stereo, so we follow that. */
254 if (pos_val_arr == NULL) {
255 /* channel layouts for 1 and 2 channels are implicit, don't warn */
257 g_warning ("Failed to retrieve channel layout from caps. This usually "
258 "means there is a GStreamer element that does not implement "
259 "multichannel audio correctly. Please file a bug.");
262 /* just return some default channel layout if we have one */
263 if (channels >= 1 && channels <= NUM_DEF_CHANS) {
264 const GstAudioChannelPosition *p;
266 p = default_positions[channels - 1];
267 return g_memdup (p, channels * sizeof (GstAudioChannelPosition));
273 g_return_val_if_fail (gst_value_array_get_size (pos_val_arr) == channels,
275 for (n = 0; n < channels; n++) {
276 t = G_VALUE_TYPE (gst_value_array_get_value (pos_val_arr, n));
277 g_return_val_if_fail (t == GST_TYPE_AUDIO_CHANNEL_POSITION, NULL);
280 /* ... and fill array */
281 pos = g_new (GstAudioChannelPosition, channels);
282 for (n = 0; n < channels; n++) {
283 pos_val_entry = gst_value_array_get_value (pos_val_arr, n);
284 pos[n] = g_value_get_enum (pos_val_entry);
287 if (!gst_audio_check_channel_positions (pos, channels)) {
296 * gst_audio_set_channel_positions:
297 * @str: A #GstStructure to set channel positions on.
298 * @pos: an array of channel positions. The number of members
299 * in this array should be equal to the (fixed!) number
300 * of the "channels" field in the given #GstStructure.
302 * Adds a "channel-positions" field to the given #GstStructure,
303 * which will represent the channel positions as given in the
304 * provided #GstAudioChannelPosition array.
308 gst_audio_set_channel_positions (GstStructure * str,
309 const GstAudioChannelPosition * pos)
311 GValue pos_val_arr = { 0 }, pos_val_entry = {
317 /* get number of channels, checkups */
318 g_return_if_fail (str != NULL);
319 g_return_if_fail (pos != NULL);
320 res = gst_structure_get_int (str, "channels", &channels);
321 g_return_if_fail (res);
322 g_return_if_fail (channels > 0);
323 if (!gst_audio_check_channel_positions (pos, channels))
326 /* build gvaluearray from positions */
327 g_value_init (&pos_val_entry, GST_TYPE_AUDIO_CHANNEL_POSITION);
328 g_value_init (&pos_val_arr, GST_TYPE_ARRAY);
329 for (n = 0; n < channels; n++) {
330 g_value_set_enum (&pos_val_entry, pos[n]);
331 gst_value_array_append_value (&pos_val_arr, &pos_val_entry);
333 g_value_unset (&pos_val_entry);
335 /* add to structure */
336 gst_structure_set_value (str,
337 GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME, &pos_val_arr);
338 g_value_unset (&pos_val_arr);
342 * gst_audio_set_structure_channel_positions_list:
343 * @str: #GstStructure to set the list of channel positions
345 * @pos: the array containing one or more possible audio
346 * channel positions that we should add in each value
347 * of the array in the given structure.
348 * @num_positions: the number of values in pos.
350 * Sets a (possibly non-fixed) list of possible audio channel
351 * positions (given in pos) on the given structure. The
352 * structure, after this function has been called, will contain
353 * a "channel-positions" field with an array of the size of
354 * the "channels" field value in the given structure (note
355 * that this means that the channels field in the provided
356 * structure should be fixed!). Each value in the array will
357 * contain each of the values given in the pos array.
361 gst_audio_set_structure_channel_positions_list (GstStructure * str,
362 const GstAudioChannelPosition * pos, gint num_positions)
365 GValue pos_val_arr = { 0 }, pos_val_list = {
366 0}, pos_val_entry = {
370 /* get number of channels, general type checkups */
371 g_return_if_fail (str != NULL);
372 g_return_if_fail (num_positions > 0);
373 g_return_if_fail (pos != NULL);
374 res = gst_structure_get_int (str, "channels", &channels);
375 g_return_if_fail (res);
376 g_return_if_fail (channels > 0);
378 /* create the array of lists */
379 g_value_init (&pos_val_arr, GST_TYPE_ARRAY);
380 g_value_init (&pos_val_entry, GST_TYPE_AUDIO_CHANNEL_POSITION);
381 for (n = 0; n < channels; n++) {
382 g_value_init (&pos_val_list, GST_TYPE_LIST);
383 for (c = 0; c < num_positions; c++) {
384 g_value_set_enum (&pos_val_entry, pos[c]);
385 gst_value_list_append_value (&pos_val_list, &pos_val_entry);
387 gst_value_array_append_value (&pos_val_arr, &pos_val_list);
388 g_value_unset (&pos_val_list);
390 g_value_unset (&pos_val_entry);
391 gst_structure_set_value (str, GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME,
393 g_value_unset (&pos_val_arr);
397 * Helper function for below. The structure will be conserved,
398 * but might be cut down. Any additional structures that were
399 * created will be stored in the returned caps.
403 add_list_to_struct (GstStructure * str,
404 const GstAudioChannelPosition * pos, gint num_positions)
406 GstCaps *caps = gst_caps_new_empty ();
408 const GValue *chan_val;
410 chan_val = gst_structure_get_value (str, "channels");
411 if (G_VALUE_TYPE (chan_val) == G_TYPE_INT) {
412 gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
413 } else if (G_VALUE_TYPE (chan_val) == GST_TYPE_LIST) {
416 const GValue *sub_val;
418 size = gst_value_list_get_size (chan_val);
419 sub_val = gst_value_list_get_value (chan_val, 0);
420 gst_structure_set_value (str, "channels", sub_val);
421 gst_caps_append (caps, add_list_to_struct (str, pos, num_positions));
423 str = gst_structure_copy (str);
424 sub_val = gst_value_list_get_value (chan_val, size);
425 gst_structure_set_value (str, "channels", sub_val);
426 gst_caps_append (caps, add_list_to_struct (str, pos, num_positions));
427 gst_caps_append_structure (caps, str);
429 } else if (G_VALUE_TYPE (chan_val) == GST_TYPE_INT_RANGE) {
432 min = gst_value_get_int_range_min (chan_val);
433 max = gst_value_get_int_range_max (chan_val);
435 gst_structure_set (str, "channels", G_TYPE_INT, min, NULL);
436 gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
437 for (++min; min < max; min++) {
438 str = gst_structure_copy (str);
439 gst_structure_set (str, "channels", G_TYPE_INT, min, NULL);
440 gst_audio_set_structure_channel_positions_list (str, pos, num_positions);
441 gst_caps_append_structure (caps, str);
444 g_warning ("Unexpected value type '%s' for channels field",
445 GST_STR_NULL (g_type_name (G_VALUE_TYPE (chan_val))));
452 * gst_audio_set_caps_channel_positions_list:
453 * @caps: #GstCaps to set the list of channel positions on.
454 * @pos: the array containing one or more possible audio
455 * channel positions that we should add in each value
456 * of the array in the given structure.
457 * @num_positions: the number of values in pos.
459 * Sets a (possibly non-fixed) list of possible audio channel
460 * positions (given in pos) on the given caps. Each of the
461 * structures of the caps, after this function has been called,
462 * will contain a "channel-positions" field with an array.
463 * Each value in the array will contain each of the values given
464 * in the pos array. Note that the size of the caps might be
465 * increased by this, since each structure with a "channel-
466 * positions" field needs to have a fixed "channels" field.
467 * The input caps is not required to have this.
471 gst_audio_set_caps_channel_positions_list (GstCaps * caps,
472 const GstAudioChannelPosition * pos, gint num_positions)
476 /* get number of channels, general type checkups */
477 g_return_if_fail (caps != NULL);
478 g_return_if_fail (num_positions > 0);
479 g_return_if_fail (pos != NULL);
481 size = gst_caps_get_size (caps);
482 for (n = 0; n < size; n++) {
483 gst_caps_append (caps, add_list_to_struct (gst_caps_get_structure (caps,
484 n), pos, num_positions));
489 * gst_audio_fixate_channel_positions:
490 * @str: a #GstStructure containing a (possibly unfixed)
491 * "channel-positions" field.
493 * Custom fixate function. Elements that implement some sort of
494 * channel conversion algorithm should use this function for
495 * fixating on GstAudioChannelPosition properties. It will take
496 * care of equal channel positioning (left/right). Caller g_free()s
497 * the return value. The input properties may be (and are supposed
499 * Note that this function is mostly a hack because we currently
500 * have no way to add default fixation functions for new GTypes.
502 * Returns: fixed values that the caller could use as a fixed
503 * set of #GstAudioChannelPosition values.
506 GstAudioChannelPosition *
507 gst_audio_fixate_channel_positions (GstStructure * str)
509 GstAudioChannelPosition *pos;
511 gint channels, n, num_unfixed = 0, i, c;
513 const GValue *pos_val_arr, *pos_val_entry, *pos_val;
515 gboolean res, is_stereo = TRUE;
520 * We're going to do this cluelessly. We'll make an array of values that
521 * conflict with each other and, for each iteration in this array, pick
522 * either one until all unknown values are filled. This might not work in
523 * corner cases but should work OK for the general case.
527 const GstAudioChannelPosition pos1[2];
528 const GstAudioChannelPosition pos2[1];
530 /* front: mono <-> stereo */
533 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
534 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
535 GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}}, { {
536 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
537 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, {
538 GST_AUDIO_CHANNEL_POSITION_INVALID}}, { {
539 GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, {
540 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}}, { {
541 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
542 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {
543 GST_AUDIO_CHANNEL_POSITION_INVALID}}, { {
544 GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, {
545 GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}}, { {
546 GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, {
547 GST_AUDIO_CHANNEL_POSITION_LFE}}, { {
548 GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
549 GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT}, {
550 GST_AUDIO_CHANNEL_POSITION_INVALID}}, { {
551 GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, {
552 GST_AUDIO_CHANNEL_POSITION_INVALID}}
558 gboolean is_fixed[3];
559 gint choice; /* -1 is none, 0 is the two, 1 is the one */
562 /* get number of channels, general type checkups */
563 g_return_val_if_fail (str != NULL, NULL);
564 res = gst_structure_get_int (str, "channels", &channels);
565 g_return_val_if_fail (res, NULL);
566 g_return_val_if_fail (channels > 0, NULL);
568 /* 0.8.x mono/stereo checks */
569 pos_val_arr = gst_structure_get_value (str,
570 GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME);
571 if (!pos_val_arr && (channels == 1 || channels == 2)) {
572 pos = g_new (GstAudioChannelPosition, channels);
574 pos[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_MONO;
576 pos[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
577 pos[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
581 g_return_val_if_fail (pos_val_arr != NULL, NULL);
582 g_return_val_if_fail (gst_value_array_get_size (pos_val_arr) == channels,
584 for (n = 0; n < channels; n++) {
585 t = G_VALUE_TYPE (gst_value_array_get_value (pos_val_arr, n));
586 g_return_val_if_fail (t == GST_TYPE_LIST ||
587 t == GST_TYPE_AUDIO_CHANNEL_POSITION, NULL);
590 /* all unknown, to start with */
591 pos = g_new (GstAudioChannelPosition, channels);
592 for (n = 0; n < channels; n++)
593 pos[n] = GST_AUDIO_CHANNEL_POSITION_INVALID;
594 num_unfixed = channels;
596 /* Iterate the array of conflicting values */
597 for (i = 0; conf[i].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID ||
598 conf[i].pos2[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; i++) {
599 /* front/center only important if not mono (obviously) */
600 if (conf[i].pos1[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER &&
605 for (n = 0; n < 3; n++) {
607 opt.num_opts[n] = -1;
608 opt.is_fixed[n] = FALSE;
611 /* Now, we'll see for each channel if it allows for any of the values in
612 * the set of conflicting audio channel positions and keep scores. */
613 for (n = 0; n < channels; n++) {
614 /* if the channel is already taken, don't bother */
615 if (pos[n] != GST_AUDIO_CHANNEL_POSITION_INVALID)
618 pos_val_entry = gst_value_array_get_value (pos_val_arr, n);
619 t = G_VALUE_TYPE (pos_val_entry);
620 if (t == GST_TYPE_LIST) {
621 /* This algorhythm is suboptimal. */
622 for (c = 0; c < gst_value_list_get_size (pos_val_entry); c++) {
623 pos_val = gst_value_list_get_value (pos_val_entry, c);
624 if (g_value_get_enum (pos_val) == conf[i].pos1[0] &&
625 opt.num_opts[0] > gst_value_list_get_size (pos_val_entry) &&
627 /* Now test if the old position of num_opt[0] also allows for
628 * the other channel (which was skipped previously). If so,
630 if (opt.num_opt[0] != -1) {
633 pos_val_entry = gst_value_array_get_value (pos_val_arr,
635 if (G_VALUE_TYPE (pos_val_entry) == GST_TYPE_LIST) {
636 for (c1 = 0; c1 < gst_value_list_get_size (pos_val_entry); c1++) {
637 pos_val = gst_value_list_get_value (pos_val_entry, c1);
638 if (g_value_get_enum (pos_val) == conf[i].pos1[1] &&
639 opt.num_opts[1] > opt.num_opts[0] && !opt.is_fixed[1]) {
640 opt.num_opts[1] = opt.num_opts[0];
641 opt.num_opt[1] = opt.num_opt[0];
644 pos_val = gst_value_list_get_value (pos_val_entry, c);
646 pos_val_entry = gst_value_array_get_value (pos_val_arr, n);
649 /* and save values */
650 opt.num_opts[0] = gst_value_list_get_size (pos_val_entry);
652 } else if (g_value_get_enum (pos_val) == conf[i].pos1[1] &&
653 opt.num_opts[1] > gst_value_list_get_size (pos_val_entry) &&
654 !opt.is_fixed[1] && n != opt.num_opt[0]) {
655 opt.num_opts[1] = gst_value_list_get_size (pos_val_entry);
659 /* 2 goes separately, because 0/1 vs. 2 are separate */
660 if (g_value_get_enum (pos_val) == conf[i].pos2[0] &&
661 opt.num_opts[2] > gst_value_list_get_size (pos_val_entry) &&
663 opt.num_opts[2] = gst_value_list_get_size (pos_val_entry);
668 if (g_value_get_enum (pos_val_entry) == conf[i].pos1[0]) {
670 opt.is_fixed[0] = TRUE;
671 } else if (g_value_get_enum (pos_val_entry) == conf[i].pos1[1]) {
673 opt.is_fixed[1] = TRUE;
674 } else if (g_value_get_enum (pos_val_entry) == conf[i].pos2[0]) {
676 opt.is_fixed[2] = TRUE;
681 /* check our results and choose either one */
682 if ((opt.is_fixed[0] || opt.is_fixed[1]) && opt.is_fixed[2]) {
683 g_warning ("Pre-fixated on both %d/%d and %d - conflict!",
684 conf[i].pos1[0], conf[i].pos1[1], conf[i].pos2[0]);
687 } else if ((opt.is_fixed[0] && opt.num_opt[1] == -1) ||
688 (opt.is_fixed[1] && opt.num_opt[0] == -1)) {
689 g_warning ("Pre-fixated one side, but other side n/a of %d/%d",
690 conf[i].pos1[0], conf[i].pos1[1]);
693 } else if (opt.is_fixed[0] || opt.is_fixed[1]) {
695 } else if (opt.is_fixed[2]) {
697 } else if (opt.num_opt[0] != -1 && opt.num_opt[1] != -1) {
699 } else if (opt.num_opt[2] != -1) {
705 /* stereo? Note that we keep is_stereo to TRUE if we didn't decide on
706 * any arrangement. The mono/stereo channels might be handled elsewhere
707 * which is clearly outside the scope of this element, so we cannot
708 * know and expect the application to handle that then. */
709 if (conf[i].pos2[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_MONO &&
714 /* now actually decide what we'll do and fixate on that */
715 if (opt.choice == 0) {
716 g_assert (conf[i].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID &&
717 conf[i].pos1[1] != GST_AUDIO_CHANNEL_POSITION_INVALID);
718 pos[opt.num_opt[0]] = conf[i].pos1[0];
719 pos[opt.num_opt[1]] = conf[i].pos1[1];
721 } else if (opt.choice == 1) {
722 g_assert (conf[i].pos2[0] != GST_AUDIO_CHANNEL_POSITION_INVALID);
723 pos[opt.num_opt[2]] = conf[i].pos2[0];
729 if (num_unfixed > 0) {
730 g_warning ("%d unfixed channel positions left after fixation!",
736 if (!gst_audio_check_channel_positions (pos, channels)) {