diff options
Diffstat (limited to 'gst-libs/gst/audio/multichannel.c')
| -rw-r--r-- | gst-libs/gst/audio/multichannel.c | 742 |
1 files changed, 0 insertions, 742 deletions
diff --git a/gst-libs/gst/audio/multichannel.c b/gst-libs/gst/audio/multichannel.c deleted file mode 100644 index 7b319b81..00000000 --- a/gst-libs/gst/audio/multichannel.c +++ /dev/null @@ -1,742 +0,0 @@ -/* 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. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "multichannel.h" - -#define GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME "channel-positions" - -/** - * 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_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. - */ -gboolean -gst_audio_check_channel_positions (const GstAudioChannelPosition * pos, - guint channels) -{ - gint i, n; - - const struct - { - const GstAudioChannelPosition pos1[2]; - const GstAudioChannelPosition pos2[1]; - } conf[] = { - /* front: mono <-> stereo */ - { { - GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, - GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, { - GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}}, { { - GST_AUDIO_CHANNEL_POSITION_INVALID}} - }; - - g_return_val_if_fail (pos != NULL, FALSE); - g_return_val_if_fail (channels > 0, FALSE); - - /* 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); - 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; - } - - /* 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; - } - - if (count > 1) { - GST_WARNING ("Channel position %d occurred %d times, not allowed", - 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", - 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, - } -}; - -/** - * 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; - - gint channels, n; - - const GValue *pos_val_arr, *pos_val_entry; - - gboolean res; - - 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); - - /* 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)); - } - - return NULL; - } - - g_return_val_if_fail (gst_value_array_get_size (pos_val_arr) == channels, - NULL); - for (n = 0; n < channels; n++) { - t = G_VALUE_TYPE (gst_value_array_get_value (pos_val_arr, n)); - 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); - 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. - * @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. - * - * Adds a "channel-positions" field to the given #GstStructure, - * 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; - - 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); - 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); - } - g_value_unset (&pos_val_entry); - - /* add to structure */ - gst_structure_set_value (str, - GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME, &pos_val_arr); - 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 - * 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); - 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); - g_value_unset (&pos_val_list); - } - g_value_unset (&pos_val_entry); - gst_structure_set_value (str, GST_AUDIO_CHANNEL_POSITIONS_FIELD_NAME, - &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 (); - - 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; - - 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)))); - } - - 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. - * 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. - * 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. - * - * Custom fixate function. Elements that implement some sort of - * channel conversion algorithm should use this function for - * 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; - - gint channels, n, num_unfixed = 0, i, c; - - const GValue *pos_val_arr, *pos_val_entry, *pos_val; - - gboolean res, is_stereo = TRUE; - - 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 - { - const GstAudioChannelPosition pos1[2]; - const GstAudioChannelPosition pos2[1]; - } conf[] = { - /* front: mono <-> stereo */ - { - { - GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, - GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, { - GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}}, { { - GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER, - GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, { - GST_AUDIO_CHANNEL_POSITION_INVALID}}, { { - GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, { - GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}}, { { - GST_AUDIO_CHANNEL_POSITION_REAR_LEFT, - GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, { - GST_AUDIO_CHANNEL_POSITION_INVALID}}, { { - GST_AUDIO_CHANNEL_POSITION_INVALID, GST_AUDIO_CHANNEL_POSITION_INVALID}, { - 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); - 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, - NULL); - for (n = 0; n < channels; n++) { - t = G_VALUE_TYPE (gst_value_array_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_array_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_array_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_array_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; -} |