1 /* GStreamer Adaptive Multi-Rate Narrow-Band (AMR-NB) plugin
2 * Copyright (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., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
21 * SECTION:element-amrnbenc
23 * @see_also: #GstAmrnbDec, #GstAmrnbParse
25 * AMR narrowband encoder based on the
26 * [opencore codec implementation](http://sourceforge.net/projects/opencore-amr).
28 * ## Example launch line
30 * gst-launch-1.0 filesrc location=abc.wav ! wavparse ! audioconvert ! audioresample ! amrnbenc ! filesink location=abc.amr
32 * Please note that the above stream misses the header, that is needed to play
44 gst_amrnbenc_bandmode_get_type (void)
46 static GType gst_amrnbenc_bandmode_type = 0;
47 static const GEnumValue gst_amrnbenc_bandmode[] = {
48 {MR475, "MR475", "MR475"},
49 {MR515, "MR515", "MR515"},
50 {MR59, "MR59", "MR59"},
51 {MR67, "MR67", "MR67"},
52 {MR74, "MR74", "MR74"},
53 {MR795, "MR795", "MR795"},
54 {MR102, "MR102", "MR102"},
55 {MR122, "MR122", "MR122"},
56 {MRDTX, "MRDTX", "MRDTX"},
59 if (!gst_amrnbenc_bandmode_type) {
60 gst_amrnbenc_bandmode_type =
61 g_enum_register_static ("GstAmrnbEncBandMode", gst_amrnbenc_bandmode);
63 return gst_amrnbenc_bandmode_type;
66 #define GST_AMRNBENC_BANDMODE_TYPE (gst_amrnbenc_bandmode_get_type())
68 #define BANDMODE_DEFAULT MR122
75 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
78 GST_STATIC_CAPS ("audio/x-raw, format = (string) " GST_AUDIO_NE (S16) ", "
79 "layout = (string) interleaved, "
80 "rate = (int) 8000," "channels = (int) 1")
83 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
86 GST_STATIC_CAPS ("audio/AMR, " "rate = (int) 8000, " "channels = (int) 1")
89 GST_DEBUG_CATEGORY_STATIC (gst_amrnbenc_debug);
90 #define GST_CAT_DEFAULT gst_amrnbenc_debug
92 static gboolean gst_amrnbenc_start (GstAudioEncoder * enc);
93 static gboolean gst_amrnbenc_stop (GstAudioEncoder * enc);
94 static gboolean gst_amrnbenc_set_format (GstAudioEncoder * enc,
96 static GstFlowReturn gst_amrnbenc_handle_frame (GstAudioEncoder * enc,
99 #define gst_amrnbenc_parent_class parent_class
100 G_DEFINE_TYPE (GstAmrnbEnc, gst_amrnbenc, GST_TYPE_AUDIO_ENCODER);
101 GST_ELEMENT_REGISTER_DEFINE (amrnbenc, "amrnbenc", GST_RANK_SECONDARY,
105 gst_amrnbenc_set_property (GObject * object, guint prop_id,
106 const GValue * value, GParamSpec * pspec)
108 GstAmrnbEnc *self = GST_AMRNBENC (object);
112 self->bandmode = g_value_get_enum (value);
115 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
122 gst_amrnbenc_get_property (GObject * object, guint prop_id,
123 GValue * value, GParamSpec * pspec)
125 GstAmrnbEnc *self = GST_AMRNBENC (object);
129 g_value_set_enum (value, self->bandmode);
132 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
139 gst_amrnbenc_class_init (GstAmrnbEncClass * klass)
141 GObjectClass *object_class = G_OBJECT_CLASS (klass);
142 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
143 GstAudioEncoderClass *base_class = GST_AUDIO_ENCODER_CLASS (klass);
145 object_class->set_property = gst_amrnbenc_set_property;
146 object_class->get_property = gst_amrnbenc_get_property;
148 base_class->start = GST_DEBUG_FUNCPTR (gst_amrnbenc_start);
149 base_class->stop = GST_DEBUG_FUNCPTR (gst_amrnbenc_stop);
150 base_class->set_format = GST_DEBUG_FUNCPTR (gst_amrnbenc_set_format);
151 base_class->handle_frame = GST_DEBUG_FUNCPTR (gst_amrnbenc_handle_frame);
153 g_object_class_install_property (object_class, PROP_BANDMODE,
154 g_param_spec_enum ("band-mode", "Band Mode",
155 "Encoding Band Mode (Kbps)", GST_AMRNBENC_BANDMODE_TYPE,
157 G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
159 gst_element_class_add_static_pad_template (element_class, &sink_template);
160 gst_element_class_add_static_pad_template (element_class, &src_template);
162 gst_element_class_set_static_metadata (element_class, "AMR-NB audio encoder",
163 "Codec/Encoder/Audio",
164 "Adaptive Multi-Rate Narrow-Band audio encoder",
165 "Wim Taymans <wim.taymans@gmail.com>");
167 GST_DEBUG_CATEGORY_INIT (gst_amrnbenc_debug, "amrnbenc", 0,
168 "AMR-NB audio encoder");
170 gst_type_mark_as_plugin_api (GST_AMRNBENC_BANDMODE_TYPE, 0);
174 gst_amrnbenc_init (GstAmrnbEnc * amrnbenc)
176 GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_ENCODER_SINK_PAD (amrnbenc));
180 gst_amrnbenc_start (GstAudioEncoder * enc)
182 GstAmrnbEnc *amrnbenc = GST_AMRNBENC (enc);
184 GST_DEBUG_OBJECT (amrnbenc, "start");
186 if (!(amrnbenc->handle = Encoder_Interface_init (0)))
193 gst_amrnbenc_stop (GstAudioEncoder * enc)
195 GstAmrnbEnc *amrnbenc = GST_AMRNBENC (enc);
197 GST_DEBUG_OBJECT (amrnbenc, "stop");
199 Encoder_Interface_exit (amrnbenc->handle);
205 gst_amrnbenc_set_format (GstAudioEncoder * enc, GstAudioInfo * info)
207 GstAmrnbEnc *amrnbenc;
210 amrnbenc = GST_AMRNBENC (enc);
212 /* parameters already parsed for us */
213 amrnbenc->rate = GST_AUDIO_INFO_RATE (info);
214 amrnbenc->channels = GST_AUDIO_INFO_CHANNELS (info);
216 /* we do not really accept other input, but anyway ... */
217 /* this is not wrong but will sound bad */
218 if (amrnbenc->channels != 1) {
219 g_warning ("amrnbdec is only optimized for mono channels");
221 if (amrnbenc->rate != 8000) {
222 g_warning ("amrnbdec is only optimized for 8000 Hz samplerate");
225 /* create reverse caps */
226 copy = gst_caps_new_simple ("audio/AMR",
227 "channels", G_TYPE_INT, amrnbenc->channels,
228 "rate", G_TYPE_INT, amrnbenc->rate, NULL);
230 gst_audio_encoder_set_output_format (GST_AUDIO_ENCODER (amrnbenc), copy);
231 gst_caps_unref (copy);
233 /* report needs to base class: hand one frame at a time */
234 gst_audio_encoder_set_frame_samples_min (enc, 160);
235 gst_audio_encoder_set_frame_samples_max (enc, 160);
236 gst_audio_encoder_set_frame_max (enc, 1);
242 gst_amrnbenc_handle_frame (GstAudioEncoder * enc, GstBuffer * buffer)
244 GstAmrnbEnc *amrnbenc;
247 GstMapInfo in_map, out_map;
250 amrnbenc = GST_AMRNBENC (enc);
252 g_return_val_if_fail (amrnbenc->handle, GST_FLOW_FLUSHING);
254 /* we don't deal with squeezing remnants, so simply discard those */
255 if (G_UNLIKELY (buffer == NULL)) {
256 GST_DEBUG_OBJECT (amrnbenc, "no data");
260 gst_buffer_map (buffer, &in_map, GST_MAP_READ);
262 if (G_UNLIKELY (in_map.size < 320)) {
263 gst_buffer_unmap (buffer, &in_map);
264 GST_DEBUG_OBJECT (amrnbenc, "discarding trailing data of %" G_GSIZE_FORMAT
265 " bytes", in_map.size);
266 return gst_audio_encoder_finish_frame (enc, NULL, -1);
269 /* get output, max size is 32 */
270 out = gst_buffer_new_and_alloc (32);
271 /* AMR encoder actually writes into the source data buffers it gets */
272 /* should be able to handle that with what we are given */
274 gst_buffer_map (out, &out_map, GST_MAP_WRITE);
277 Encoder_Interface_Encode (amrnbenc->handle, amrnbenc->bandmode,
278 (short *) in_map.data, out_map.data, 0);
279 gst_buffer_unmap (out, &out_map);
280 gst_buffer_resize (out, 0, out_size);
281 gst_buffer_unmap (buffer, &in_map);
283 GST_LOG_OBJECT (amrnbenc, "output data size %" G_GSIZE_FORMAT, out_size);
286 ret = gst_audio_encoder_finish_frame (enc, out, 160);
288 /* should not happen (without dtx or so at least) */
289 GST_WARNING_OBJECT (amrnbenc, "no encoded data; discarding input");
290 gst_buffer_unref (out);
291 ret = gst_audio_encoder_finish_frame (enc, NULL, -1);