2 * Copyright (C) <2009> Wim Taymans <wim.taymans@gmail.com>
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., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
26 #include <gst/rtp/gstrtpbuffer.h>
28 #include "gstrtpceltdepay.h"
30 GST_DEBUG_CATEGORY_STATIC (rtpceltdepay_debug);
31 #define GST_CAT_DEFAULT (rtpceltdepay_debug)
33 /* RtpCELTDepay signals and args */
35 #define DEFAULT_FRAMESIZE 480
36 #define DEFAULT_CHANNELS 1
37 #define DEFAULT_CLOCKRATE 32000
50 static GstStaticPadTemplate gst_rtp_celt_depay_sink_template =
51 GST_STATIC_PAD_TEMPLATE ("sink",
54 GST_STATIC_CAPS ("application/x-rtp, "
55 "media = (string) \"audio\", "
56 "clock-rate = (int) [32000, 48000], "
57 "encoding-name = (string) \"CELT\"")
60 static GstStaticPadTemplate gst_rtp_celt_depay_src_template =
61 GST_STATIC_PAD_TEMPLATE ("src",
64 GST_STATIC_CAPS ("audio/x-celt")
67 static GstBuffer *gst_rtp_celt_depay_process (GstRTPBaseDepayload * depayload,
69 static gboolean gst_rtp_celt_depay_setcaps (GstRTPBaseDepayload * depayload,
72 #define gst_rtp_celt_depay_parent_class parent_class
73 G_DEFINE_TYPE (GstRtpCELTDepay, gst_rtp_celt_depay,
74 GST_TYPE_RTP_BASE_DEPAYLOAD);
77 gst_rtp_celt_depay_class_init (GstRtpCELTDepayClass * klass)
79 GstElementClass *gstelement_class;
80 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
82 GST_DEBUG_CATEGORY_INIT (rtpceltdepay_debug, "rtpceltdepay", 0,
83 "CELT RTP Depayloader");
85 gstelement_class = (GstElementClass *) klass;
86 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
88 gst_element_class_add_pad_template (gstelement_class,
89 gst_static_pad_template_get (&gst_rtp_celt_depay_src_template));
90 gst_element_class_add_pad_template (gstelement_class,
91 gst_static_pad_template_get (&gst_rtp_celt_depay_sink_template));
93 gst_element_class_set_static_metadata (gstelement_class,
94 "RTP CELT depayloader", "Codec/Depayloader/Network/RTP",
95 "Extracts CELT audio from RTP packets",
96 "Wim Taymans <wim.taymans@gmail.com>");
98 gstrtpbasedepayload_class->process = gst_rtp_celt_depay_process;
99 gstrtpbasedepayload_class->set_caps = gst_rtp_celt_depay_setcaps;
103 gst_rtp_celt_depay_init (GstRtpCELTDepay * rtpceltdepay)
108 * vendor string (len bytes),
109 * user_len 4 (0) bytes LE
111 static const gchar gst_rtp_celt_comment[] =
112 "\045\0\0\0Depayloaded with GStreamer celtdepay\0\0\0\0";
115 gst_rtp_celt_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
117 GstStructure *structure;
118 GstRtpCELTDepay *rtpceltdepay;
119 gint clock_rate, nb_channels = 0, frame_size = 0;
127 rtpceltdepay = GST_RTP_CELT_DEPAY (depayload);
129 structure = gst_caps_get_structure (caps, 0);
131 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
133 depayload->clock_rate = clock_rate;
135 if ((params = gst_structure_get_string (structure, "encoding-params")))
136 nb_channels = atoi (params);
138 nb_channels = DEFAULT_CHANNELS;
140 if ((params = gst_structure_get_string (structure, "frame-size")))
141 frame_size = atoi (params);
143 frame_size = DEFAULT_FRAMESIZE;
144 rtpceltdepay->frame_size = frame_size;
146 GST_DEBUG_OBJECT (depayload, "clock-rate=%d channels=%d frame-size=%d",
147 clock_rate, nb_channels, frame_size);
149 /* construct minimal header and comment packet for the decoder */
150 buf = gst_buffer_new_and_alloc (60);
151 gst_buffer_map (buf, &map, GST_MAP_WRITE);
153 memcpy (ptr, "CELT ", 8);
155 memcpy (ptr, "1.1.12", 7);
157 GST_WRITE_UINT32_LE (ptr, 0x80000006); /* version */
159 GST_WRITE_UINT32_LE (ptr, 56); /* header_size */
161 GST_WRITE_UINT32_LE (ptr, clock_rate); /* rate */
163 GST_WRITE_UINT32_LE (ptr, nb_channels); /* channels */
165 GST_WRITE_UINT32_LE (ptr, frame_size); /* frame-size */
167 GST_WRITE_UINT32_LE (ptr, -1); /* overlap */
169 GST_WRITE_UINT32_LE (ptr, -1); /* bytes_per_packet */
171 GST_WRITE_UINT32_LE (ptr, 0); /* extra headers */
172 gst_buffer_unmap (buf, &map);
174 srccaps = gst_caps_new_empty_simple ("audio/x-celt");
175 res = gst_pad_set_caps (depayload->srcpad, srccaps);
176 gst_caps_unref (srccaps);
178 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtpceltdepay), buf);
180 buf = gst_buffer_new_and_alloc (sizeof (gst_rtp_celt_comment));
181 gst_buffer_fill (buf, 0, gst_rtp_celt_comment, sizeof (gst_rtp_celt_comment));
183 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtpceltdepay), buf);
190 GST_ERROR_OBJECT (depayload, "no clock-rate specified");
196 gst_rtp_celt_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
198 GstBuffer *outbuf = NULL;
200 guint offset, pos, payload_len, total_size, size;
202 gint clock_rate = 0, frame_size = 0;
203 GstClockTime framesize_ns = 0, timestamp;
205 GstRtpCELTDepay *rtpceltdepay;
206 GstRTPBuffer rtp = { NULL, };
208 rtpceltdepay = GST_RTP_CELT_DEPAY (depayload);
209 clock_rate = depayload->clock_rate;
210 frame_size = rtpceltdepay->frame_size;
211 framesize_ns = gst_util_uint64_scale_int (frame_size, GST_SECOND, clock_rate);
213 timestamp = GST_BUFFER_TIMESTAMP (buf);
215 gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
217 GST_LOG_OBJECT (depayload,
218 "got %" G_GSIZE_FORMAT " bytes, mark %d ts %u seqn %d",
219 gst_buffer_get_size (buf), gst_rtp_buffer_get_marker (&rtp),
220 gst_rtp_buffer_get_timestamp (&rtp), gst_rtp_buffer_get_seq (&rtp));
222 GST_LOG_OBJECT (depayload, "got clock-rate=%d, frame_size=%d, "
223 "_ns=%" GST_TIME_FORMAT ", timestamp=%" GST_TIME_FORMAT, clock_rate,
224 frame_size, GST_TIME_ARGS (framesize_ns), GST_TIME_ARGS (timestamp));
226 payload = gst_rtp_buffer_get_payload (&rtp);
227 payload_len = gst_rtp_buffer_get_payload_len (&rtp);
229 /* first count how many bytes are consumed by the size headers and make offset
230 * point to the first data byte */
233 while (total_size < payload_len) {
235 s = payload[offset++];
240 /* offset is now pointing to the payload */
243 while (total_size < payload_len) {
252 outbuf = gst_rtp_buffer_get_payload_subbuffer (&rtp, offset, size);
255 if (frame_size != -1 && clock_rate != -1) {
256 GST_BUFFER_TIMESTAMP (outbuf) = timestamp + framesize_ns * n;
257 GST_BUFFER_DURATION (outbuf) = framesize_ns;
259 GST_LOG_OBJECT (depayload, "push timestamp=%"
260 GST_TIME_FORMAT ", duration=%" GST_TIME_FORMAT,
261 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
262 GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
264 gst_rtp_base_depayload_push (depayload, outbuf);
266 gst_rtp_buffer_unmap (&rtp);
272 gst_rtp_celt_depay_plugin_init (GstPlugin * plugin)
274 return gst_element_register (plugin, "rtpceltdepay",
275 GST_RANK_SECONDARY, GST_TYPE_RTP_CELT_DEPAY);