1 /* -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
3 * Copyright (C) <2002> Iain Holmes <iain@prettypeople.org>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
26 #include <gstwavenc.h>
28 static void gst_wavenc_class_init (GstWavEncClass *klass);
29 static void gst_wavenc_init (GstWavEnc *wavenc);
30 static void gst_wavenc_chain (GstPad *pad, GstBuffer *buf);
32 #define WAVE_FORMAT_PCM 0x0001
34 #define WRITE_U32(buf, x) *(buf) = (unsigned char) (x&0xff);\
35 *((buf)+1) = (unsigned char)((x>>8)&0xff);\
36 *((buf)+2) = (unsigned char)((x>>16)&0xff);\
37 *((buf)+3) = (unsigned char)((x>>24)&0xff);
39 #define WRITE_U16(buf, x) *(buf) = (unsigned char) (x&0xff);\
40 *((buf)+1) = (unsigned char)((x>>8)&0xff);
43 guint8 id[4]; /* RIFF */
45 guint8 wav_id[4]; /* WAVE */
53 struct common_struct {
56 guint32 dwSamplesPerSec;
57 guint32 dwAvgBytesPerSec;
59 guint16 wBitsPerSample; /* Only for PCM */
63 struct riff_struct riff;
64 struct chunk_struct format;
65 struct common_struct common;
66 struct chunk_struct data;
69 static GstElementDetails gst_wavenc_details = {
71 "Codec/Audio/Encoder",
73 "Encode raw audio into WAV",
75 "Iain Holmes <iain@prettypeople.org>",
79 static GstPadTemplate *srctemplate, *sinktemplate;
81 GST_PAD_TEMPLATE_FACTORY (sink_factory,
88 "endianness", GST_PROPS_INT (G_LITTLE_ENDIAN),
89 "signed", GST_PROPS_BOOLEAN (TRUE),
90 "width", GST_PROPS_LIST (
94 "depth", GST_PROPS_LIST (
98 "rate", GST_PROPS_INT_RANGE (8000, 48000),
99 "channels", GST_PROPS_INT_RANGE (1, 2)
103 GST_PAD_TEMPLATE_FACTORY (src_factory,
114 static GstElementClass *parent_class = NULL;
116 static const GstEventMask *
117 gst_wavenc_get_event_masks (GstPad *pad)
119 static const GstEventMask src_event_masks[] = {
120 { GST_EVENT_EOS, 0 },
124 return src_event_masks;
128 gst_wavenc_get_type (void)
130 static GType type = 0;
133 static const GTypeInfo info = {
134 sizeof (GstWavEncClass),
137 (GClassInitFunc) gst_wavenc_class_init,
142 (GInstanceInitFunc) gst_wavenc_init
145 type = g_type_register_static (GST_TYPE_ELEMENT, "GstWavEnc", &info, 0);
151 static GstElementStateReturn
152 gst_wavenc_change_state (GstElement *element)
154 GstWavEnc *wavenc = GST_WAVENC (element);
156 switch (GST_STATE_TRANSITION (element)) {
157 case GST_STATE_PAUSED_TO_READY:
158 wavenc->setup = FALSE;
159 wavenc->flush_header = TRUE;
165 if (parent_class->change_state) {
166 return parent_class->change_state (element);
169 return GST_STATE_SUCCESS;
173 gst_wavenc_class_init (GstWavEncClass *klass)
175 GstElementClass *element_class;
177 element_class = (GstElementClass *) klass;
178 element_class->change_state = gst_wavenc_change_state;
180 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
184 gst_wavenc_setup (GstWavEnc *wavenc)
186 struct wave_header wave;
187 gint size = 0x7fffffff; /* Use a bogus size initially */
189 wave.common.wChannels = wavenc->channels;
190 wave.common.wBitsPerSample = wavenc->bits;
191 wave.common.dwSamplesPerSec = wavenc->rate;
193 memset (wavenc->header, 0, WAV_HEADER_LEN);
195 /* Fill out our wav-header with some information */
196 strncpy (wave.riff.id, "RIFF", 4);
197 wave.riff.len = size - 8;
198 strncpy (wave.riff.wav_id, "WAVE", 4);
200 strncpy (wave.format.id, "fmt ", 4);
201 wave.format.len = 16;
203 wave.common.wFormatTag = WAVE_FORMAT_PCM;
204 wave.common.dwAvgBytesPerSec = wave.common.wChannels * wave.common.dwSamplesPerSec * (wave.common.wBitsPerSample >> 3);
205 wave.common.wBlockAlign = wave.common.wChannels * (wave.common.wBitsPerSample >> 3);
207 strncpy (wave.data.id, "data", 4);
208 wave.data.len = size - 44;
210 strncpy (wavenc->header, wave.riff.id, 4);
211 WRITE_U32 (wavenc->header + 4, wave.riff.len);
212 strncpy (wavenc->header + 8, wave.riff.wav_id, 4);
213 strncpy (wavenc->header + 12, wave.format.id, 4);
214 WRITE_U32 (wavenc->header + 16, wave.format.len);
215 WRITE_U16 (wavenc->header + 20, wave.common.wFormatTag);
216 WRITE_U16 (wavenc->header + 22, wave.common.wChannels);
217 WRITE_U32 (wavenc->header + 24, wave.common.dwSamplesPerSec);
218 WRITE_U32 (wavenc->header + 28, wave.common.dwAvgBytesPerSec);
219 WRITE_U16 (wavenc->header + 32, wave.common.wBlockAlign);
220 WRITE_U16 (wavenc->header + 34, wave.common.wBitsPerSample);
221 strncpy (wavenc->header + 36, wave.data.id, 4);
222 WRITE_U32 (wavenc->header + 40, wave.data.len);
224 wavenc->setup = TRUE;
228 static GstPadLinkReturn
229 gst_wavenc_sinkconnect (GstPad *pad,
234 wavenc = GST_WAVENC (gst_pad_get_parent (pad));
236 if (!GST_CAPS_IS_FIXED (caps)) {
237 return GST_PAD_LINK_DELAYED;
240 gst_caps_get_int (caps, "channels", &wavenc->channels);
241 gst_caps_get_int (caps, "rate", &wavenc->rate);
242 gst_caps_get_int (caps, "depth", &wavenc->bits);
244 gst_wavenc_setup (wavenc);
247 return GST_PAD_LINK_OK;
250 return GST_PAD_LINK_REFUSED;
254 gst_wavenc_stop_file (GstWavEnc *wavenc)
259 event = gst_event_new_seek (GST_FORMAT_BYTES |
260 GST_SEEK_METHOD_SET, 0);
261 gst_pad_send_event (GST_PAD_PEER (wavenc->srcpad), event);
263 outbuf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);
264 WRITE_U32 (wavenc->header + 4, wavenc->length);
265 memcpy (GST_BUFFER_DATA (outbuf), wavenc->header, WAV_HEADER_LEN);
267 gst_pad_push (wavenc->srcpad, outbuf);
271 gst_wavenc_handle_event (GstPad *pad,
277 wavenc = GST_WAVENC (gst_pad_get_parent (pad));
279 type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
283 wavenc->pad_eos = TRUE;
284 gst_wavenc_stop_file (wavenc);
285 gst_pad_push (wavenc->srcpad,
286 GST_BUFFER (gst_event_new (GST_EVENT_EOS)));
287 gst_element_set_eos (GST_ELEMENT (wavenc));
298 gst_wavenc_init (GstWavEnc *wavenc)
300 wavenc->sinkpad = gst_pad_new_from_template (sinktemplate, "sink");
301 gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->sinkpad);
302 gst_pad_set_chain_function (wavenc->sinkpad, gst_wavenc_chain);
303 gst_pad_set_link_function (wavenc->sinkpad, gst_wavenc_sinkconnect);
304 gst_pad_set_event_function (wavenc->sinkpad, gst_wavenc_handle_event);
305 gst_pad_set_event_mask_function (wavenc->sinkpad, gst_wavenc_get_event_masks);
307 wavenc->srcpad = gst_pad_new_from_template (srctemplate, "src");
308 gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->srcpad);
310 wavenc->setup = FALSE;
311 wavenc->flush_header = TRUE;
315 gst_wavenc_chain (GstPad *pad,
320 wavenc = GST_WAVENC (gst_pad_get_parent (pad));
322 if (!wavenc->setup) {
323 gst_buffer_unref (buf);
324 gst_element_error (GST_ELEMENT (wavenc), "encoder not initialised (input is not audio?)");
328 if (GST_PAD_IS_USABLE (wavenc->srcpad)) {
329 if (wavenc->flush_header) {
332 outbuf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);
333 memcpy (GST_BUFFER_DATA (outbuf), wavenc->header, WAV_HEADER_LEN);
334 GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
336 gst_pad_push (wavenc->srcpad, outbuf);
337 wavenc->flush_header = FALSE;
340 wavenc->length += GST_BUFFER_SIZE (buf);
341 gst_pad_push (wavenc->srcpad, buf);
346 plugin_init (GModule *module,
349 GstElementFactory *factory;
351 factory = gst_element_factory_new ("wavenc", GST_TYPE_WAVENC,
352 &gst_wavenc_details);
354 srctemplate = src_factory ();
355 gst_element_factory_add_pad_template (factory, srctemplate);
357 sinktemplate = sink_factory ();
358 gst_element_factory_add_pad_template (factory, sinktemplate);
360 gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
365 GstPluginDesc plugin_desc = {