2 * Copyright (C) <2002> Iain Holmes <iain@prettypeople.org>
8 static void gst_wavenc_class_init (GstWavEncClass *klass);
9 static void gst_wavenc_init (GstWavEnc *wavenc);
10 static void gst_wavenc_chain (GstPad *pad, GstBuffer *buf);
12 #define WAVE_FORMAT_PCM 0x0001
14 #define WRITE_U32(buf, x) *(buf) = (unsigned char) (x&0xff);\
15 *((buf)+1) = (unsigned char)((x>>8)&0xff);\
16 *((buf)+2) = (unsigned char)((x>>16)&0xff);\
17 *((buf)+3) = (unsigned char)((x>>24)&0xff);
19 #define WRITE_U16(buf, x) *(buf) = (unsigned char) (x&0xff);\
20 *((buf)+1) = (unsigned char)((x>>8)&0xff);
23 unsigned char id[4]; /* RIFF */
25 unsigned char wav_id[4]; /* WAVE */
33 struct common_struct {
34 unsigned short wFormatTag;
35 unsigned short wChannels;
36 unsigned int dwSamplesPerSec;
37 unsigned int dwAvgBytesPerSec;
38 unsigned short wBlockAlign;
39 unsigned short wBitsPerSample; /* Only for PCM */
43 struct riff_struct riff;
44 struct chunk_struct format;
45 struct common_struct common;
46 struct chunk_struct data;
49 static GstElementDetails gst_wavenc_details = {
53 "Encode raw audio into WAV",
55 "Iain Holmes <iain@prettypeople.org>",
59 static GstPadTemplate *srctemplate, *sinktemplate;
61 static GstPadTemplate *
64 return gst_pad_template_new ("wavenc_sink",
67 gst_caps_new ("wavenc_raw",
69 gst_props_new ("format", GST_PROPS_STRING ("int"),
70 "law", GST_PROPS_INT (0),
71 "endianness", GST_PROPS_INT (G_BYTE_ORDER),
72 "signed", GST_PROPS_BOOLEAN (TRUE),
73 "width", GST_PROPS_INT (16),
74 "depth", GST_PROPS_INT (16),
75 "rate", GST_PROPS_INT_RANGE (8000, 48000),
76 "channels", GST_PROPS_INT_RANGE (1, 2),
81 static GstPadTemplate *
84 return gst_pad_template_new ("wavenc_src",
87 gst_caps_new ("wavenc_wav",
93 static GstElementClass *parent_class = NULL;
96 gst_wavenc_get_type (void)
98 static GType type = 0;
101 static const GTypeInfo info = {
102 sizeof (GstWavEncClass), NULL, NULL,
103 (GClassInitFunc) gst_wavenc_class_init, NULL, NULL,
104 sizeof (GstWavEnc), 0, (GInstanceInitFunc) gst_wavenc_init
107 type = g_type_register_static (GST_TYPE_ELEMENT, "GstWavEnc", &info, 0);
113 static GstElementStateReturn
114 gst_wavenc_change_state (GstElement *element)
116 GstWavEnc *wavenc = GST_WAVENC (element);
118 switch (GST_STATE_TRANSITION (element)) {
119 case GST_STATE_NULL_TO_READY:
120 case GST_STATE_READY_TO_PAUSED:
121 wavenc->setup = FALSE;
128 if (parent_class->change_state) {
129 return parent_class->change_state (element);
132 return GST_STATE_SUCCESS;
136 gst_wavenc_class_init (GstWavEncClass *klass)
138 GstElementClass *element_class;
140 element_class = (GstElementClass *) klass;
141 element_class->change_state = gst_wavenc_change_state;
143 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
147 gst_wavenc_setup (GstWavEnc *wavenc)
149 struct wave_header wave;
150 int size = 0x7fffffff; /* Use a bogus size initially */
152 wave.common.wChannels = wavenc->channels;
153 wave.common.wBitsPerSample = wavenc->bits;
154 wave.common.dwSamplesPerSec = wavenc->rate;
156 memset (wavenc->header, 0, WAV_HEADER_LEN);
158 /* Fill out our wav-header with some information */
159 strncpy (wave.riff.id, "RIFF", 4);
160 wave.riff.len = size - 8;
161 strncpy (wave.riff.wav_id, "WAVE", 4);
163 strncpy (wave.format.id, "fmt ", 4);
164 wave.format.len = 16;
166 wave.common.wFormatTag = WAVE_FORMAT_PCM;
167 wave.common.dwAvgBytesPerSec = wave.common.wChannels * wave.common.dwSamplesPerSec * (wave.common.wBitsPerSample >> 3);
168 wave.common.wBlockAlign = wave.common.wChannels * (wave.common.wBitsPerSample >> 3);
170 strncpy (wave.data.id, "data", 4);
171 wave.data.len = size - 44;
173 strncpy (wavenc->header, wave.riff.id, 4);
174 WRITE_U32 (wavenc->header + 4, wave.riff.len);
175 strncpy (wavenc->header + 8, wave.riff.wav_id, 4);
176 strncpy (wavenc->header + 12, wave.format.id, 4);
177 WRITE_U32 (wavenc->header + 16, wave.format.len);
178 WRITE_U16 (wavenc->header + 20, wave.common.wFormatTag);
179 WRITE_U16 (wavenc->header + 22, wave.common.wChannels);
180 WRITE_U32 (wavenc->header + 24, wave.common.dwSamplesPerSec);
181 WRITE_U32 (wavenc->header + 28, wave.common.dwAvgBytesPerSec);
182 WRITE_U16 (wavenc->header + 32, wave.common.wBlockAlign);
183 WRITE_U16 (wavenc->header + 34, wave.common.wBitsPerSample);
184 strncpy (wavenc->header + 36, wave.data.id, 4);
185 WRITE_U32 (wavenc->header + 40, wave.data.len);
187 wavenc->setup = TRUE;
191 static GstPadConnectReturn
192 gst_wavenc_sinkconnect (GstPad *pad,
197 wavenc = GST_WAVENC (gst_pad_get_parent (pad));
199 if (!GST_CAPS_IS_FIXED (caps)) {
200 return GST_PAD_CONNECT_DELAYED;
203 gst_caps_get_int (caps, "channels", &wavenc->channels);
204 gst_caps_get_int (caps, "rate", &wavenc->rate);
205 gst_caps_get_int (caps, "depth", &wavenc->bits);
207 gst_wavenc_setup (wavenc);
210 return GST_PAD_CONNECT_OK;
213 return GST_PAD_CONNECT_REFUSED;
217 gst_wavenc_init (GstWavEnc *wavenc)
219 wavenc->sinkpad = gst_pad_new_from_template (sinktemplate, "sink");
220 gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->sinkpad);
221 gst_pad_set_chain_function (wavenc->sinkpad, gst_wavenc_chain);
222 gst_pad_set_connect_function (wavenc->sinkpad, gst_wavenc_sinkconnect);
224 wavenc->srcpad = gst_pad_new_from_template (srctemplate, "src");
225 gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->srcpad);
227 wavenc->setup = FALSE;
228 wavenc->flush_header = TRUE;
232 gst_wavenc_chain (GstPad *pad,
237 wavenc = GST_WAVENC (gst_pad_get_parent (pad));
239 if (GST_IS_EVENT (buf)) {
240 GstEvent *event = GST_EVENT (buf);
242 switch (GST_EVENT_TYPE (event)) {
244 /* Should do something... */
245 gst_event_unref (event);
247 gst_pad_push (wavenc->srcpad, GST_BUFFER (gst_event_new (GST_EVENT_EOS)));
248 gst_element_set_eos (GST_ELEMENT (wavenc));
252 gst_pad_event_default (pad, event);
256 if (!wavenc->setup) {
257 gst_buffer_unref (buf);
258 gst_element_error (GST_ELEMENT (wavenc), "encoder not initialised (input is not audio?)");
262 if (wavenc->flush_header) {
265 outbuf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);
266 memcpy (GST_BUFFER_DATA (outbuf), wavenc->header, WAV_HEADER_LEN);
268 if (GST_PAD_IS_USABLE (wavenc->srcpad)) {
269 gst_pad_push (wavenc->srcpad, outbuf);
271 gst_buffer_unref (outbuf);
274 wavenc->flush_header = FALSE;
277 gst_pad_push (wavenc->srcpad, buf);
282 plugin_init (GModule *module,
285 GstElementFactory *factory;
287 factory = gst_element_factory_new ("wavenc", GST_TYPE_WAVENC,
288 &gst_wavenc_details);
290 srctemplate = src_factory ();
291 gst_element_factory_add_pad_template (factory, srctemplate);
293 sinktemplate = sink_factory ();
294 gst_element_factory_add_pad_template (factory, sinktemplate);
296 gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
301 GstPluginDesc plugin_desc = {