2 * Opus Payloader Gst Element
4 * @author: Danilo Cesar Lemes de Paula <danilo.cesar@collabora.co.uk>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
28 #include <gst/rtp/gstrtpbuffer.h>
29 #include <gst/audio/audio.h>
31 #include "gstrtpopuspay.h"
32 #include "gstrtputils.h"
34 GST_DEBUG_CATEGORY_STATIC (rtpopuspay_debug);
35 #define GST_CAT_DEFAULT (rtpopuspay_debug)
38 static GstStaticPadTemplate gst_rtp_opus_pay_sink_template =
39 GST_STATIC_PAD_TEMPLATE ("sink",
43 ("audio/x-opus, channels = (int) [1, 2], channel-mapping-family = (int) 0")
46 static GstStaticPadTemplate gst_rtp_opus_pay_src_template =
47 GST_STATIC_PAD_TEMPLATE ("src",
50 GST_STATIC_CAPS ("application/x-rtp, "
51 "media = (string) \"audio\", "
52 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
53 "clock-rate = (int) 48000, "
54 "encoding-params = (string) \"2\", "
55 "encoding-name = (string) { \"OPUS\", \"X-GST-OPUS-DRAFT-SPITTKA-00\" }")
58 static gboolean gst_rtp_opus_pay_setcaps (GstRTPBasePayload * payload,
60 static GstCaps *gst_rtp_opus_pay_getcaps (GstRTPBasePayload * payload,
61 GstPad * pad, GstCaps * filter);
62 static GstFlowReturn gst_rtp_opus_pay_handle_buffer (GstRTPBasePayload *
63 payload, GstBuffer * buffer);
65 G_DEFINE_TYPE (GstRtpOPUSPay, gst_rtp_opus_pay, GST_TYPE_RTP_BASE_PAYLOAD);
68 gst_rtp_opus_pay_class_init (GstRtpOPUSPayClass * klass)
70 GstRTPBasePayloadClass *gstbasertppayload_class;
71 GstElementClass *element_class;
73 gstbasertppayload_class = (GstRTPBasePayloadClass *) klass;
74 element_class = GST_ELEMENT_CLASS (klass);
76 gstbasertppayload_class->set_caps = gst_rtp_opus_pay_setcaps;
77 gstbasertppayload_class->get_caps = gst_rtp_opus_pay_getcaps;
78 gstbasertppayload_class->handle_buffer = gst_rtp_opus_pay_handle_buffer;
80 gst_element_class_add_static_pad_template (element_class,
81 &gst_rtp_opus_pay_src_template);
82 gst_element_class_add_static_pad_template (element_class,
83 &gst_rtp_opus_pay_sink_template);
85 gst_element_class_set_static_metadata (element_class,
87 "Codec/Payloader/Network/RTP",
88 "Puts Opus audio in RTP packets",
89 "Danilo Cesar Lemes de Paula <danilo.cesar@collabora.co.uk>");
91 GST_DEBUG_CATEGORY_INIT (rtpopuspay_debug, "rtpopuspay", 0,
92 "Opus RTP Payloader");
96 gst_rtp_opus_pay_init (GstRtpOPUSPay * rtpopuspay)
101 gst_rtp_opus_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
108 const char *sprop_stereo = NULL;
109 char *sprop_maxcapturerate = NULL;
111 src_caps = gst_pad_get_allowed_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload));
113 src_caps = gst_caps_make_writable (src_caps);
114 src_caps = gst_caps_truncate (src_caps);
115 s = gst_caps_get_structure (src_caps, 0);
116 gst_structure_fixate_field_string (s, "encoding-name", "OPUS");
117 encoding_name = g_strdup (gst_structure_get_string (s, "encoding-name"));
118 gst_caps_unref (src_caps);
120 encoding_name = g_strdup ("X-GST-OPUS-DRAFT-SPITTKA-00");
123 s = gst_caps_get_structure (caps, 0);
124 if (gst_structure_get_int (s, "channels", &channels)) {
126 GST_ERROR_OBJECT (payload,
127 "More than 2 channels with channel-mapping-family=0 is invalid");
129 } else if (channels == 2) {
136 if (gst_structure_get_int (s, "rate", &rate)) {
137 sprop_maxcapturerate = g_strdup_printf ("%d", rate);
140 gst_rtp_base_payload_set_options (payload, "audio", FALSE,
141 encoding_name, 48000);
142 g_free (encoding_name);
144 if (sprop_maxcapturerate && sprop_stereo) {
146 gst_rtp_base_payload_set_outcaps (payload, "sprop-maxcapturerate",
147 G_TYPE_STRING, sprop_maxcapturerate, "sprop-stereo", G_TYPE_STRING,
149 } else if (sprop_maxcapturerate) {
151 gst_rtp_base_payload_set_outcaps (payload, "sprop-maxcapturerate",
152 G_TYPE_STRING, sprop_maxcapturerate, NULL);
153 } else if (sprop_stereo) {
155 gst_rtp_base_payload_set_outcaps (payload, "sprop-stereo",
156 G_TYPE_STRING, sprop_stereo, NULL);
158 res = gst_rtp_base_payload_set_outcaps (payload, NULL);
161 g_free (sprop_maxcapturerate);
167 gst_rtp_opus_pay_handle_buffer (GstRTPBasePayload * basepayload,
171 GstClockTime pts, dts, duration;
173 pts = GST_BUFFER_PTS (buffer);
174 dts = GST_BUFFER_DTS (buffer);
175 duration = GST_BUFFER_DURATION (buffer);
177 outbuf = gst_rtp_buffer_new_allocate (0, 0, 0);
179 gst_rtp_copy_audio_meta (basepayload, outbuf, buffer);
181 outbuf = gst_buffer_append (outbuf, buffer);
183 GST_BUFFER_PTS (outbuf) = pts;
184 GST_BUFFER_DTS (outbuf) = dts;
185 GST_BUFFER_DURATION (outbuf) = duration;
188 return gst_rtp_base_payload_push (basepayload, outbuf);
192 gst_rtp_opus_pay_getcaps (GstRTPBasePayload * payload,
193 GstPad * pad, GstCaps * filter)
195 GstCaps *caps, *peercaps, *tcaps;
199 if (pad == GST_RTP_BASE_PAYLOAD_SRCPAD (payload))
201 GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_opus_pay_parent_class)->get_caps
202 (payload, pad, filter);
204 tcaps = gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload));
205 peercaps = gst_pad_peer_query_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload),
207 gst_caps_unref (tcaps);
210 GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_opus_pay_parent_class)->get_caps
211 (payload, pad, filter);
213 if (gst_caps_is_empty (peercaps))
216 caps = gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SINKPAD (payload));
218 s = gst_caps_get_structure (peercaps, 0);
219 stereo = gst_structure_get_string (s, "stereo");
220 if (stereo != NULL) {
221 caps = gst_caps_make_writable (caps);
223 if (!strcmp (stereo, "1")) {
224 GstCaps *caps2 = gst_caps_copy (caps);
226 gst_caps_set_simple (caps, "channels", G_TYPE_INT, 2, NULL);
227 gst_caps_set_simple (caps2, "channels", G_TYPE_INT, 1, NULL);
228 caps = gst_caps_merge (caps, caps2);
229 } else if (!strcmp (stereo, "0")) {
230 GstCaps *caps2 = gst_caps_copy (caps);
232 gst_caps_set_simple (caps, "channels", G_TYPE_INT, 1, NULL);
233 gst_caps_set_simple (caps2, "channels", G_TYPE_INT, 2, NULL);
234 caps = gst_caps_merge (caps, caps2);
237 gst_caps_unref (peercaps);
240 GstCaps *tmp = gst_caps_intersect_full (caps, filter,
241 GST_CAPS_INTERSECT_FIRST);
242 gst_caps_unref (caps);
246 GST_DEBUG_OBJECT (payload, "Returning caps: %" GST_PTR_FORMAT, caps);
251 gst_rtp_opus_pay_plugin_init (GstPlugin * plugin)
253 return gst_element_register (plugin, "rtpopuspay",
254 GST_RANK_PRIMARY, GST_TYPE_RTP_OPUS_PAY);