--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_good/gst/wavenc/gstwavenc.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,724 @@
+/* -*- mOde: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
+/* GStreamer .wav encoder
+ * Copyright (C) <2002> Iain Holmes <iain@prettypeople.org>
+ * Copyright (C) <2006> Tim-Philipp Müller <tim centricular net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+
+
+#include <string.h>
+#include "gstwavenc.h"
+//#include "riff.h" rj
+
+#include "gst/riff/riff-ids.h"
+#include "gst/riff/riff-media.h"
+#include <gst/gst-i18n-plugin.h>
+
+#ifdef __SYMBIAN32__
+#include<gst/gstinfo.h>
+#endif
+
+GST_DEBUG_CATEGORY_STATIC (wavenc_debug);
+#define GST_CAT_DEFAULT (wavenc_debug) //rj
+
+#define WAVE_FORMAT_PCM 0x0001
+
+struct riff_struct
+{
+ guint8 id[4]; /* RIFF */
+ guint32 len;
+ guint8 wav_id[4]; /* WAVE */
+};
+
+struct chunk_struct
+{
+ guint8 id[4];
+ guint32 len;
+};
+
+struct common_struct
+{
+ guint16 wFormatTag;
+ guint16 wChannels;
+ guint32 dwSamplesPerSec;
+ guint32 dwAvgBytesPerSec;
+ guint16 wBlockAlign;
+ guint16 wBitsPerSample; /* Only for PCM */
+};
+
+struct wave_header
+{
+ struct riff_struct riff;
+ struct chunk_struct format;
+ struct common_struct common;
+ struct chunk_struct data;
+};
+
+static const GstElementDetails gst_wavenc_details =
+GST_ELEMENT_DETAILS ("WAV audio muxer",
+ "Codec/Muxer/Audio",
+ "Encode raw audio into WAV",
+ "Iain Holmes <iain@prettypeople.org>");
+
+/* FIXME: mono doesn't produce correct files it seems, at least mplayer xruns */
+/* Max. of two channels, more channels need WAVFORMATEX with
+ * channel layout, which we do not support yet */
+#define SINK_CAPS \
+ "audio/x-raw-int, " \
+ "rate = (int) [ 1, MAX ], " \
+ "channels = (int) [ 1, 2 ], " \
+ "endianness = (int) LITTLE_ENDIAN, " \
+ "width = (int) 16, " \
+ "depth = (int) 16, " \
+ "signed = (boolean) true" \
+ "; " \
+ "audio/x-raw-int, " \
+ "rate = (int) [ 1, MAX ], " \
+ "channels = (int) [ 1, 2 ], " \
+ "width = (int) 8, " \
+ "signed = (boolean) false"
+
+static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS (SINK_CAPS)
+ );
+
+static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("audio/x-wav")
+ );
+
+#ifndef __SYMBIAN32__ //rj
+GST_BOILERPLATE (GstWavEnc, gst_wavenc, GstElement, GST_TYPE_ELEMENT);
+#endif
+
+//rj
+static void gst_wavenc_base_init (gpointer g_class);
+static void gst_wavenc_class_init (GstWavEncClass * klass);
+static void gst_wavenc_init (GstWavEnc * wavenc, GstWavEncClass * klass);
+static GstElementClass *parent_class = NULL;
+//rj
+
+static GstFlowReturn gst_wavenc_chain (GstPad * pad, GstBuffer * buf);
+static gboolean gst_wavenc_event (GstPad * pad, GstEvent * event);
+static GstStateChangeReturn gst_wavenc_change_state (GstElement * element,
+ GstStateChange transition);
+static gboolean gst_wavenc_sink_setcaps (GstPad * pad, GstCaps * caps);
+
+
+
+
+GType gst_wavenc_get_type (void)
+{
+ static GType wavenc_type = 0;
+
+ if (!wavenc_type) {
+ static const GTypeInfo wavenc_info = {
+ sizeof (GstWavEncClass),
+ gst_wavenc_base_init,
+ NULL,
+ (GClassInitFunc) gst_wavenc_class_init,
+ NULL,
+ NULL,
+ sizeof (GstWavEnc),
+ 0,
+ (GInstanceInitFunc) gst_wavenc_init,
+ };
+
+ wavenc_type =
+ g_type_register_static (GST_TYPE_ELEMENT, "GstWavEnc",
+ &wavenc_info, 0);
+ }
+ return wavenc_type;
+}
+
+
+static void
+gst_wavenc_base_init (gpointer g_class)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_set_details (element_class, &gst_wavenc_details);
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&src_factory));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&sink_factory));
+
+ GST_DEBUG_CATEGORY_INIT (wavenc_debug, "wavenc", 0, "WAV encoder element");
+}
+
+static void
+gst_wavenc_class_init (GstWavEncClass * klass)
+{
+ GstElementClass *element_class;
+
+ element_class = (GstElementClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);//rj
+
+ element_class->change_state = GST_DEBUG_FUNCPTR (gst_wavenc_change_state);
+}
+
+static void
+gst_wavenc_init (GstWavEnc * wavenc, GstWavEncClass * klass)
+{
+ wavenc->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
+ gst_pad_set_chain_function (wavenc->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_wavenc_chain));
+ gst_pad_set_event_function (wavenc->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_wavenc_event));
+ gst_pad_set_setcaps_function (wavenc->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_wavenc_sink_setcaps));
+ gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->sinkpad);
+
+ wavenc->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
+ gst_pad_use_fixed_caps (wavenc->srcpad);
+ gst_pad_set_caps (wavenc->srcpad,
+ gst_static_pad_template_get_caps (&src_factory));
+ gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->srcpad);
+}
+
+#define WAV_HEADER_LEN 44
+
+/* FIXME: we are probably not handling depth != width correctly here */
+static GstBuffer *
+gst_wavenc_create_header_buf (GstWavEnc * wavenc, guint audio_data_size)
+{
+ struct wave_header wave;
+ GstBuffer *buf;
+ guint8 *header;
+
+ buf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);
+ header = GST_BUFFER_DATA (buf);
+ memset (header, 0, WAV_HEADER_LEN);
+
+ wave.common.wChannels = wavenc->channels;
+ wave.common.wBitsPerSample = wavenc->depth;
+ wave.common.dwSamplesPerSec = wavenc->rate;
+
+ /* Fill out our wav-header with some information */
+ memcpy (wave.riff.id, "RIFF", 4);
+ wave.riff.len = audio_data_size + WAV_HEADER_LEN - 8;
+ memcpy (wave.riff.wav_id, "WAVE", 4);
+
+ memcpy (wave.format.id, "fmt ", 4);
+ wave.format.len = 16;
+
+ wave.common.wFormatTag = WAVE_FORMAT_PCM;
+ wave.common.dwAvgBytesPerSec =
+ wave.common.wChannels * wave.common.dwSamplesPerSec *
+ (wave.common.wBitsPerSample >> 3);
+ wave.common.wBlockAlign =
+ wave.common.wChannels * (wave.common.wBitsPerSample >> 3);
+
+ memcpy (wave.data.id, "data", 4);
+ wave.data.len = audio_data_size;
+
+ memcpy (header, (char *) wave.riff.id, 4);
+ GST_WRITE_UINT32_LE (header + 4, wave.riff.len);
+ memcpy (header + 8, (char *) wave.riff.wav_id, 4);
+ memcpy (header + 12, (char *) wave.format.id, 4);
+ GST_WRITE_UINT32_LE (header + 16, wave.format.len);
+ GST_WRITE_UINT16_LE (header + 20, wave.common.wFormatTag);
+ GST_WRITE_UINT16_LE (header + 22, wave.common.wChannels);
+ GST_WRITE_UINT32_LE (header + 24, wave.common.dwSamplesPerSec);
+ GST_WRITE_UINT32_LE (header + 28, wave.common.dwAvgBytesPerSec);
+ GST_WRITE_UINT16_LE (header + 32, wave.common.wBlockAlign);
+ GST_WRITE_UINT16_LE (header + 34, wave.common.wBitsPerSample);
+ memcpy (header + 36, (char *) wave.data.id, 4);
+ GST_WRITE_UINT32_LE (header + 40, wave.data.len);
+
+ gst_buffer_set_caps (buf, GST_PAD_CAPS (wavenc->srcpad));
+
+ return buf;
+}
+
+static GstFlowReturn
+gst_wavenc_push_header (GstWavEnc * wavenc, guint audio_data_size)
+{
+ GstFlowReturn ret;
+ GstBuffer *outbuf;
+
+ /* seek to beginning of file */
+ gst_pad_push_event (wavenc->srcpad,
+ gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_BYTES,
+ 0, GST_CLOCK_TIME_NONE, 0));
+
+ GST_DEBUG_OBJECT (wavenc, "writing header with datasize=%u", audio_data_size);
+
+ outbuf = gst_wavenc_create_header_buf (wavenc, audio_data_size);
+ GST_BUFFER_OFFSET (outbuf) = 0;
+
+ ret = gst_pad_push (wavenc->srcpad, outbuf);
+
+ if (ret != GST_FLOW_OK) {
+ GST_WARNING_OBJECT (wavenc, "push header failed: flow = %s",
+ gst_flow_get_name (ret));
+ }
+
+ return ret;
+}
+
+static gboolean
+gst_wavenc_sink_setcaps (GstPad * pad, GstCaps * caps)
+{
+ GstWavEnc *wavenc;
+ GstStructure *structure;
+ gint chans, rate, width, depth;
+
+ wavenc = GST_WAVENC (gst_pad_get_parent (pad));
+
+ if (wavenc->sent_header) {
+ GST_WARNING_OBJECT (wavenc, "cannot change format in middle of stream");
+ goto fail;
+ }
+
+ GST_DEBUG_OBJECT (wavenc, "got caps: %" GST_PTR_FORMAT, caps);
+
+ structure = gst_caps_get_structure (caps, 0);
+ if (!gst_structure_get_int (structure, "channels", &chans) ||
+ !gst_structure_get_int (structure, "rate", &rate) ||
+ !gst_structure_get_int (structure, "width", &width) ||
+ (width != 8 && !gst_structure_get_int (structure, "depth", &depth))) {
+ GST_WARNING_OBJECT (wavenc, "caps incomplete");
+ goto fail;
+ }
+
+ wavenc->channels = chans;
+ wavenc->width = width;
+ wavenc->depth = (width == 8) ? 8 : depth;
+ wavenc->rate = rate;
+
+ GST_LOG_OBJECT (wavenc, "accepted caps: chans=%u width=%u depth=%u rate=%u",
+ wavenc->channels, wavenc->width, wavenc->depth, wavenc->rate);
+
+ gst_object_unref (wavenc);
+ return TRUE;
+
+fail:
+ gst_object_unref (wavenc);
+ return FALSE;
+}
+
+#if 0
+static struct _maps
+{
+ const guint32 id;
+ const gchar *name;
+} maps[] = {
+ {
+ GST_RIFF_INFO_IARL, "Location"}, {
+ GST_RIFF_INFO_IART, "Artist"}, {
+ GST_RIFF_INFO_ICMS, "Commissioner"}, {
+ GST_RIFF_INFO_ICMT, "Comment"}, {
+ GST_RIFF_INFO_ICOP, "Copyright"}, {
+ GST_RIFF_INFO_ICRD, "Creation Date"}, {
+ GST_RIFF_INFO_IENG, "Engineer"}, {
+ GST_RIFF_INFO_IGNR, "Genre"}, {
+ GST_RIFF_INFO_IKEY, "Keywords"}, {
+ GST_RIFF_INFO_INAM, "Title"}, {
+ GST_RIFF_INFO_IPRD, "Product"}, {
+ GST_RIFF_INFO_ISBJ, "Subject"}, {
+ GST_RIFF_INFO_ISFT, "Software"}, {
+ GST_RIFF_INFO_ITCH, "Technician"}
+};
+
+static guint32
+get_id_from_name (const char *name)
+{
+ int i;
+
+ for (i = 0; i < G_N_ELEMENTS (maps); i++) {
+ if (strcasecmp (maps[i].name, name) == 0) {
+ return maps[i].id;
+ }
+ }
+
+ return 0;
+}
+
+static void
+write_metadata (GstWavEnc * wavenc)
+{
+ GString *info_str;
+ GList *props;
+ int total = 4;
+ gboolean need_to_write = FALSE;
+
+ info_str = g_string_new ("LIST INFO");
+
+ for (props = wavenc->metadata->properties->properties; props;
+ props = props->next) {
+ GstPropsEntry *entry = props->data;
+ const char *name;
+ guint32 id;
+
+ name = gst_props_entry_get_name (entry);
+ id = get_id_from_name (name);
+ if (id != 0) {
+ const char *text;
+ char *tmp;
+ int len, req, i;
+
+ need_to_write = TRUE; /* We've got at least one entry */
+
+ gst_props_entry_get_string (entry, &text);
+ len = strlen (text) + 1; /* The length in the file includes the \0 */
+
+ tmp = g_strdup_printf ("%" GST_FOURCC_FORMAT "%d%s", GST_FOURCC_ARGS (id),
+ GUINT32_TO_LE (len), text);
+ g_string_append (info_str, tmp);
+ g_free (tmp);
+
+ /* Check that we end on an even boundary */
+ req = ((len + 8) + 1) & ~1;
+ for (i = 0; i < req - len; i++) {
+ g_string_append_printf (info_str, "%c", 0);
+ }
+
+ total += req;
+ }
+ }
+
+ if (need_to_write) {
+ GstBuffer *buf;
+
+ /* Now we've got all the strings together, we can write our length in */
+ info_str->str[4] = GUINT32_TO_LE (total);
+
+ buf = gst_buffer_new ();
+ gst_buffer_set_data (buf, info_str->str, info_str->len);
+
+ gst_pad_push (wavenc->srcpad, GST_DATA (buf));
+ g_string_free (info_str, FALSE);
+ }
+}
+
+static void
+write_cues (GstWavEnc * wavenc)
+{
+ GString *cue_string, *point_string;
+ GstBuffer *buf;
+ GList *cue_list, *c;
+ int num_cues, total = 4;
+
+ if (gst_props_get (wavenc->metadata->properties,
+ "cues", &cue_list, NULL) == FALSE) {
+ /* No cues, move along please, nothing to see here */
+ return;
+ }
+
+ /* Space for 'cue ', chunk size and number of cuepoints */
+ cue_string = g_string_new ("cue ");
+#define CUEPOINT_SIZE 24
+ point_string = g_string_sized_new (CUEPOINT_SIZE);
+
+ for (c = cue_list, num_cues = 0; c; c = c->next, num_cues++) {
+ GstCaps *cue_caps = c->data;
+ guint32 pos;
+
+ gst_props_get (cue_caps->properties, "position", &pos, NULL);
+
+ point_string->str[0] = GUINT32_TO_LE (num_cues + 1);
+ point_string->str[4] = GUINT32_TO_LE (0);
+ /* Fixme: There is probably a macro for this */
+ point_string->str[8] = 'd';
+ point_string->str[9] = 'a';
+ point_string->str[10] = 't';
+ point_string->str[11] = 'a';
+ point_string->str[12] = GUINT32_TO_LE (0);
+ point_string->str[16] = GUINT32_TO_LE (0);
+ point_string->str[20] = GUINT32_TO_LE (pos);
+
+ total += CUEPOINT_SIZE;
+ }
+
+ /* Set the length and chunk size */
+ cue_string->str[4] = GUINT32_TO_LE (total);
+ cue_string->str[8] = GUINT32_TO_LE (num_cues);
+ /* Stick the cue points on the end */
+ g_string_append (cue_string, point_string->str);
+ g_string_free (point_string, TRUE);
+
+ buf = gst_buffer_new ();
+ gst_buffer_set_data (buf, cue_string->str, cue_string->len);
+
+ gst_pad_push (wavenc->srcpad, GST_DATA (buf));
+ g_string_free (cue_string, FALSE);
+}
+
+static void
+write_labels (GstWavEnc * wavenc)
+{
+ GstBuffer *buf;
+ GString *info_str;
+ int total = 4;
+ GList *caps;
+
+ info_str = g_string_new ("LIST adtl");
+ if (gst_props_get (wavenc->metadata->properties, "ltxts", &caps, NULL)) {
+ GList *p;
+ int i;
+
+ for (p = caps, i = 1; p; p = p->next, i++) {
+ GstCaps *ltxt_caps = p->data;
+ GString *ltxt;
+ char *label = NULL;
+ int len, req, j;
+
+ gst_props_get (ltxt_caps->properties, "name", &label, NULL);
+ len = strlen (label);
+
+#define LTXT_SIZE 28
+ ltxt = g_string_new ("ltxt ");
+ ltxt->str[8] = GUINT32_TO_LE (i); /* Identifier */
+ ltxt->str[12] = GUINT32_TO_LE (0); /* Sample Length */
+ ltxt->str[16] = GUINT32_TO_LE (0); /* FIXME: Don't save the purpose yet */
+ ltxt->str[20] = GUINT16_TO_LE (0); /* Country */
+ ltxt->str[22] = GUINT16_TO_LE (0); /* Language */
+ ltxt->str[24] = GUINT16_TO_LE (0); /* Dialect */
+ ltxt->str[26] = GUINT16_TO_LE (0); /* Code Page */
+ g_string_append (ltxt, label);
+ g_free (label);
+
+ len += LTXT_SIZE;
+
+ ltxt->str[4] = GUINT32_TO_LE (len);
+
+ /* Check that we end on an even boundary */
+ req = ((len + 8) + 1) & ~1;
+ for (j = 0; j < req - len; j++) {
+ g_string_append_printf (ltxt, "%c", 0);
+ }
+
+ total += req;
+
+ g_string_append (info_str, ltxt->str);
+ g_string_free (ltxt, TRUE);
+ }
+ }
+
+ if (gst_props_get (wavenc->metadata->properties, "labels", &caps, NULL)) {
+ GList *p;
+ int i;
+
+ for (p = caps, i = 1; p; p = p->next, i++) {
+ GstCaps *labl_caps = p->data;
+ GString *labl;
+ char *label = NULL;
+ int len, req, j;
+
+ gst_props_get (labl_caps->properties, "name", &label, NULL);
+ len = strlen (label);
+
+#define LABL_SIZE 4
+ labl = g_string_new ("labl ");
+ labl->str[8] = GUINT32_TO_LE (i);
+ g_string_append (labl, label);
+ g_free (label);
+
+ len += LABL_SIZE;
+
+ labl->str[4] = GUINT32_TO_LE (len);
+
+ /* Check our size */
+ req = ((len + 8) + 1) & ~1;
+ for (j = 0; j < req - len; j++) {
+ g_string_append_printf (labl, "%c", 0);
+ }
+
+ total += req;
+
+ g_string_append (info_str, labl->str);
+ g_string_free (labl, TRUE);
+ }
+ }
+
+ if (gst_props_get (wavenc->metadata->properties, "notes", &caps, NULL)) {
+ GList *p;
+ int i;
+
+ for (p = caps, i = 1; p; p = p->next, i++) {
+ GstCaps *note_caps = p->data;
+ GString *note;
+ char *label = NULL;
+ int len, req, j;
+
+ gst_props_get (note_caps->properties, "name", &label, NULL);
+ len = strlen (label);
+
+#define NOTE_SIZE 4
+ note = g_string_new ("note ");
+ note->str[8] = GUINT32_TO_LE (i);
+ g_string_append (note, label);
+ g_free (label);
+
+ len += NOTE_SIZE;
+
+ note->str[4] = GUINT32_TO_LE (len);
+
+ /* Size check */
+ req = ((len + 8) + 1) & ~1;
+ for (j = 0; j < req - len; j++) {
+ g_string_append_printf (note, "%c", 0);
+ }
+
+ total += req;
+
+ g_string_append (info_str, note->str);
+ g_string_free (note, TRUE);
+ }
+ }
+
+ info_str->str[4] = GUINT32_TO_LE (total);
+
+ buf = gst_buffer_new ();
+ gst_buffer_set_data (buf, info_str->str, info_str->len);
+
+ gst_pad_push (wavenc->srcpad, GST_DATA (buf));
+ g_string_free (info_str, FALSE);
+}
+#endif
+
+static gboolean
+gst_wavenc_event (GstPad * pad, GstEvent * event)
+{
+ gboolean res = TRUE;
+ GstWavEnc *wavenc;
+
+ wavenc = GST_WAVENC (gst_pad_get_parent (pad));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_EOS:{
+ GST_DEBUG_OBJECT (wavenc, "got EOS");
+#if 0
+ /* Write our metadata if we have any */
+ if (wavenc->metadata) {
+ write_metadata (wavenc);
+ write_cues (wavenc);
+ write_labels (wavenc);
+ }
+#endif
+ /* write header with correct length values */
+ gst_wavenc_push_header (wavenc, wavenc->length);
+
+ /* and forward the EOS event */
+ res = gst_pad_event_default (pad, event);
+ break;
+ }
+ case GST_EVENT_NEWSEGMENT:
+ /* Just drop it, it's probably in TIME format
+ * anyway. We'll send our own newsegment event */
+ gst_event_unref (event);
+ break;
+ default:
+ res = gst_pad_event_default (pad, event);
+ break;
+ }
+
+ gst_object_unref (wavenc);
+ return res;
+}
+
+static GstFlowReturn
+gst_wavenc_chain (GstPad * pad, GstBuffer * buf)
+{
+ GstWavEnc *wavenc = GST_WAVENC (GST_PAD_PARENT (pad));
+ GstFlowReturn flow = GST_FLOW_OK;
+
+ g_return_val_if_fail (wavenc->channels > 0, GST_FLOW_WRONG_STATE);
+
+ if (!wavenc->sent_header) {
+ /* use bogus size initially, we'll write the real
+ * header when we get EOS and know the exact length */
+ flow = gst_wavenc_push_header (wavenc, 0x7FFF0000);
+
+ if (flow != GST_FLOW_OK)
+ return flow;
+
+ GST_DEBUG_OBJECT (wavenc, "wrote dummy header");
+ wavenc->sent_header = TRUE;
+ }
+
+ wavenc->length += GST_BUFFER_SIZE (buf);
+
+ GST_LOG_OBJECT (wavenc, "pushing %u bytes raw audio, ts=%" GST_TIME_FORMAT,
+ GST_BUFFER_SIZE (buf), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
+
+ buf = gst_buffer_make_metadata_writable (buf);
+ gst_buffer_set_caps (buf, GST_PAD_CAPS (wavenc->srcpad));
+ GST_BUFFER_OFFSET (buf) = WAV_HEADER_LEN + wavenc->length;
+ GST_BUFFER_OFFSET_END (buf) = GST_BUFFER_OFFSET_NONE;
+
+ flow = gst_pad_push (wavenc->srcpad, buf);
+
+ return flow;
+}
+
+static GstStateChangeReturn
+gst_wavenc_change_state (GstElement * element, GstStateChange transition)
+{
+ GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+ GstWavEnc *wavenc = GST_WAVENC (element);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_NULL_TO_READY:
+ wavenc->channels = 0;
+ wavenc->width = 0;
+ wavenc->depth = 0;
+ wavenc->rate = 0;
+ wavenc->length = 0;
+ wavenc->sent_header = FALSE;
+ break;
+ default:
+ break;
+ }
+
+ ret = parent_class->change_state (element, transition);
+ if (ret != GST_STATE_CHANGE_SUCCESS)
+ return ret;
+
+ return ret;
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+ return gst_element_register (plugin, "wavenc", GST_RANK_NONE,
+ GST_TYPE_WAVENC);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ "wavenc",
+ "Encode raw audio into WAV",
+ plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
+
+EXPORT_C GstPluginDesc* _GST_PLUGIN_DESC()
+{
+ return &gst_plugin_desc;
+}
+