| /* GStreamer |
| * Copyright (C) 2011 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>. |
| * Copyright (C) 2011 Nokia Corporation. All rights reserved. |
| * Contact: Stefan Kost <stefan.kost@nokia.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <gst/audio/audio.h> |
| #include "gstaudioutilsprivate.h" |
| |
| /* |
| * Takes caps and copies its audio fields to tmpl_caps |
| */ |
| static GstCaps * |
| __gst_audio_element_proxy_caps (GstElement * element, GstCaps * templ_caps, |
| GstCaps * caps) |
| { |
| GstCaps *result = gst_caps_new_empty (); |
| gint i, j; |
| gint templ_caps_size = gst_caps_get_size (templ_caps); |
| gint caps_size = gst_caps_get_size (caps); |
| |
| for (i = 0; i < templ_caps_size; i++) { |
| GQuark q_name = |
| gst_structure_get_name_id (gst_caps_get_structure (templ_caps, i)); |
| GstCapsFeatures *features = gst_caps_get_features (templ_caps, i); |
| |
| for (j = 0; j < caps_size; j++) { |
| const GstStructure *caps_s = gst_caps_get_structure (caps, j); |
| const GValue *val; |
| GstStructure *s; |
| GstCaps *tmp = gst_caps_new_empty (); |
| |
| s = gst_structure_new_id_empty (q_name); |
| if ((val = gst_structure_get_value (caps_s, "rate"))) |
| gst_structure_set_value (s, "rate", val); |
| if ((val = gst_structure_get_value (caps_s, "channels"))) |
| gst_structure_set_value (s, "channels", val); |
| if ((val = gst_structure_get_value (caps_s, "channels-mask"))) |
| gst_structure_set_value (s, "channels-mask", val); |
| |
| gst_caps_append_structure_full (tmp, s, |
| gst_caps_features_copy (features)); |
| result = gst_caps_merge (result, tmp); |
| } |
| } |
| |
| return result; |
| } |
| |
| /** |
| * __gst_audio_element_proxy_getcaps: |
| * @element: a #GstElement |
| * @sinkpad: the element's sink #GstPad |
| * @srcpad: the element's source #GstPad |
| * @initial_caps: initial caps |
| * @filter: filter caps |
| * |
| * Returns caps that express @initial_caps (or sink template caps if |
| * @initial_caps == NULL) restricted to rate/channels/... |
| * combinations supported by downstream elements (e.g. muxers). |
| * |
| * Returns: a #GstCaps owned by caller |
| */ |
| GstCaps * |
| __gst_audio_element_proxy_getcaps (GstElement * element, GstPad * sinkpad, |
| GstPad * srcpad, GstCaps * initial_caps, GstCaps * filter) |
| { |
| GstCaps *templ_caps, *src_templ_caps; |
| GstCaps *peer_caps; |
| GstCaps *allowed; |
| GstCaps *fcaps, *filter_caps; |
| |
| /* Allow downstream to specify rate/channels constraints |
| * and forward them upstream for audio converters to handle |
| */ |
| templ_caps = initial_caps ? gst_caps_ref (initial_caps) : |
| gst_pad_get_pad_template_caps (sinkpad); |
| src_templ_caps = gst_pad_get_pad_template_caps (srcpad); |
| if (filter && !gst_caps_is_any (filter)) { |
| GstCaps *proxy_filter = |
| __gst_audio_element_proxy_caps (element, src_templ_caps, filter); |
| |
| peer_caps = gst_pad_peer_query_caps (srcpad, proxy_filter); |
| gst_caps_unref (proxy_filter); |
| } else { |
| peer_caps = gst_pad_peer_query_caps (srcpad, NULL); |
| } |
| |
| allowed = gst_caps_intersect_full (peer_caps, src_templ_caps, |
| GST_CAPS_INTERSECT_FIRST); |
| |
| gst_caps_unref (src_templ_caps); |
| gst_caps_unref (peer_caps); |
| |
| if (!allowed || gst_caps_is_any (allowed)) { |
| fcaps = templ_caps; |
| goto done; |
| } else if (gst_caps_is_empty (allowed)) { |
| fcaps = gst_caps_ref (allowed); |
| goto done; |
| } |
| |
| GST_LOG_OBJECT (element, "template caps %" GST_PTR_FORMAT, templ_caps); |
| GST_LOG_OBJECT (element, "allowed caps %" GST_PTR_FORMAT, allowed); |
| |
| filter_caps = __gst_audio_element_proxy_caps (element, templ_caps, allowed); |
| |
| fcaps = gst_caps_intersect (filter_caps, templ_caps); |
| gst_caps_unref (filter_caps); |
| gst_caps_unref (templ_caps); |
| |
| if (filter) { |
| GST_LOG_OBJECT (element, "intersecting with %" GST_PTR_FORMAT, filter); |
| filter_caps = gst_caps_intersect (fcaps, filter); |
| gst_caps_unref (fcaps); |
| fcaps = filter_caps; |
| } |
| |
| done: |
| gst_caps_replace (&allowed, NULL); |
| |
| GST_LOG_OBJECT (element, "proxy caps %" GST_PTR_FORMAT, fcaps); |
| |
| return fcaps; |
| } |