gstreamer/ext/celt/gstceltdec.c

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/* GStreamer
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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.
*/
/*
* Based on the speexdec element.
*/
/**
* SECTION:element-celtdec
* @see_also: celtenc, oggdemux
*
* This element decodes a CELT stream to raw integer audio.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch -v filesrc location=celt.ogg ! oggdemux ! celtdec ! audioconvert ! audioresample ! alsasink
* ]| Decode an Ogg/Celt file. To create an Ogg/Celt file refer to the documentation of celtenc.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstceltdec.h"
#include <string.h>
#include <gst/tag/tag.h>
GST_DEBUG_CATEGORY_STATIC (celtdec_debug);
#define GST_CAT_DEFAULT celtdec_debug
#define DEC_MAX_FRAME_SIZE 2000
static GstStaticPadTemplate celt_dec_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-int, "
"rate = (int) [ 32000, 64000 ], "
"channels = (int) [ 1, 2 ], "
"endianness = (int) BYTE_ORDER, "
"signed = (boolean) true, " "width = (int) 16, " "depth = (int) 16")
);
static GstStaticPadTemplate celt_dec_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-celt")
);
GST_BOILERPLATE (GstCeltDec, gst_celt_dec, GstElement, GST_TYPE_ELEMENT);
static gboolean celt_dec_sink_event (GstPad * pad, GstEvent * event);
static GstFlowReturn celt_dec_chain (GstPad * pad, GstBuffer * buf);
static GstStateChangeReturn celt_dec_change_state (GstElement * element,
GstStateChange transition);
static gboolean celt_dec_src_event (GstPad * pad, GstEvent * event);
static gboolean celt_dec_src_query (GstPad * pad, GstQuery * query);
static gboolean celt_dec_sink_query (GstPad * pad, GstQuery * query);
static const GstQueryType *celt_get_src_query_types (GstPad * pad);
static const GstQueryType *celt_get_sink_query_types (GstPad * pad);
static gboolean celt_dec_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value);
static GstFlowReturn celt_dec_chain_parse_data (GstCeltDec * dec,
GstBuffer * buf, GstClockTime timestamp, GstClockTime duration);
static void
gst_celt_dec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&celt_dec_src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&celt_dec_sink_factory));
gst_element_class_set_details_simple (element_class, "Celt audio decoder",
"Codec/Decoder/Audio",
"decode celt streams to audio",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
}
static void
gst_celt_dec_class_init (GstCeltDecClass * klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass *) klass;
gstelement_class->change_state = GST_DEBUG_FUNCPTR (celt_dec_change_state);
GST_DEBUG_CATEGORY_INIT (celtdec_debug, "celtdec", 0,
"celt decoding element");
}
static void
gst_celt_dec_reset (GstCeltDec * dec)
{
gst_segment_init (&dec->segment, GST_FORMAT_UNDEFINED);
dec->granulepos = -1;
dec->packetno = 0;
dec->frame_size = 0;
dec->frame_duration = 0;
if (dec->state) {
celt_decoder_destroy (dec->state);
dec->state = NULL;
}
if (dec->mode) {
celt_mode_destroy (dec->mode);
dec->mode = NULL;
}
memset (&dec->header, 0, sizeof (dec->header));
}
static void
gst_celt_dec_init (GstCeltDec * dec, GstCeltDecClass * g_class)
{
dec->sinkpad =
gst_pad_new_from_static_template (&celt_dec_sink_factory, "sink");
gst_pad_set_chain_function (dec->sinkpad, GST_DEBUG_FUNCPTR (celt_dec_chain));
gst_pad_set_event_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (celt_dec_sink_event));
gst_pad_set_query_type_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (celt_get_sink_query_types));
gst_pad_set_query_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (celt_dec_sink_query));
gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
dec->srcpad = gst_pad_new_from_static_template (&celt_dec_src_factory, "src");
gst_pad_use_fixed_caps (dec->srcpad);
gst_pad_set_event_function (dec->srcpad,
GST_DEBUG_FUNCPTR (celt_dec_src_event));
gst_pad_set_query_type_function (dec->srcpad,
GST_DEBUG_FUNCPTR (celt_get_src_query_types));
gst_pad_set_query_function (dec->srcpad,
GST_DEBUG_FUNCPTR (celt_dec_src_query));
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
gst_celt_dec_reset (dec);
}
static gboolean
celt_dec_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstCeltDec *dec;
guint64 scale = 1;
dec = GST_CELT_DEC (gst_pad_get_parent (pad));
if (dec->packetno < 1) {
res = FALSE;
goto cleanup;
}
if (src_format == *dest_format) {
*dest_value = src_value;
res = TRUE;
goto cleanup;
}
if (pad == dec->sinkpad &&
(src_format == GST_FORMAT_BYTES || *dest_format == GST_FORMAT_BYTES)) {
res = FALSE;
goto cleanup;
}
switch (src_format) {
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
scale = sizeof (gint16) * dec->header.nb_channels;
case GST_FORMAT_DEFAULT:
*dest_value =
gst_util_uint64_scale_int (scale * src_value,
dec->header.sample_rate, GST_SECOND);
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_BYTES:
*dest_value = src_value * sizeof (gint16) * dec->header.nb_channels;
break;
case GST_FORMAT_TIME:
*dest_value =
gst_util_uint64_scale_int (src_value, GST_SECOND,
dec->header.sample_rate);
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_value = src_value / (sizeof (gint16) * dec->header.nb_channels);
break;
case GST_FORMAT_TIME:
*dest_value = gst_util_uint64_scale_int (src_value, GST_SECOND,
dec->header.sample_rate * sizeof (gint16) *
dec->header.nb_channels);
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
cleanup:
gst_object_unref (dec);
return res;
}
static const GstQueryType *
celt_get_sink_query_types (GstPad * pad)
{
static const GstQueryType celt_dec_sink_query_types[] = {
GST_QUERY_CONVERT,
0
};
return celt_dec_sink_query_types;
}
static gboolean
celt_dec_sink_query (GstPad * pad, GstQuery * query)
{
GstCeltDec *dec;
gboolean res;
dec = GST_CELT_DEC (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONVERT:
{
GstFormat src_fmt, dest_fmt;
gint64 src_val, dest_val;
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
res = celt_dec_convert (pad, src_fmt, src_val, &dest_fmt, &dest_val);
if (res) {
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
}
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
gst_object_unref (dec);
return res;
}
static const GstQueryType *
celt_get_src_query_types (GstPad * pad)
{
static const GstQueryType celt_dec_src_query_types[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
0
};
return celt_dec_src_query_types;
}
static gboolean
celt_dec_src_query (GstPad * pad, GstQuery * query)
{
GstCeltDec *dec;
gboolean res = FALSE;
dec = GST_CELT_DEC (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:{
GstSegment segment;
GstFormat format;
gint64 cur;
gst_query_parse_position (query, &format, NULL);
GST_PAD_STREAM_LOCK (dec->sinkpad);
segment = dec->segment;
GST_PAD_STREAM_UNLOCK (dec->sinkpad);
if (segment.format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (dec, "segment not initialised yet");
break;
}
if ((res = celt_dec_convert (dec->srcpad, GST_FORMAT_TIME,
segment.last_stop, &format, &cur))) {
gst_query_set_position (query, format, cur);
}
break;
}
case GST_QUERY_DURATION:{
GstFormat format = GST_FORMAT_TIME;
gint64 dur;
/* get duration from demuxer */
if (!gst_pad_query_peer_duration (dec->sinkpad, &format, &dur))
break;
gst_query_parse_duration (query, &format, NULL);
/* and convert it into the requested format */
if ((res = celt_dec_convert (dec->srcpad, GST_FORMAT_TIME,
dur, &format, &dur))) {
gst_query_set_duration (query, format, dur);
}
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
gst_object_unref (dec);
return res;
}
static gboolean
celt_dec_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = FALSE;
GstCeltDec *dec = GST_CELT_DEC (gst_pad_get_parent (pad));
GST_LOG_OBJECT (dec, "handling %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:{
GstFormat format, tformat;
gdouble rate;
GstEvent *real_seek;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gint64 tcur, tstop;
gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur,
&stop_type, &stop);
/* we have to ask our peer to seek to time here as we know
* nothing about how to generate a granulepos from the src
* formats or anything.
*
* First bring the requested format to time
*/
tformat = GST_FORMAT_TIME;
if (!(res = celt_dec_convert (pad, format, cur, &tformat, &tcur)))
break;
if (!(res = celt_dec_convert (pad, format, stop, &tformat, &tstop)))
break;
/* then seek with time on the peer */
real_seek = gst_event_new_seek (rate, GST_FORMAT_TIME,
flags, cur_type, tcur, stop_type, tstop);
GST_LOG_OBJECT (dec, "seek to %" GST_TIME_FORMAT, GST_TIME_ARGS (tcur));
res = gst_pad_push_event (dec->sinkpad, real_seek);
gst_event_unref (event);
break;
}
default:
res = gst_pad_event_default (pad, event);
break;
}
gst_object_unref (dec);
return res;
}
static gboolean
celt_dec_sink_event (GstPad * pad, GstEvent * event)
{
GstCeltDec *dec;
gboolean ret = FALSE;
dec = GST_CELT_DEC (gst_pad_get_parent (pad));
GST_LOG_OBJECT (dec, "handling %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:{
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gboolean update;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
if (format != GST_FORMAT_TIME)
goto newseg_wrong_format;
if (rate <= 0.0)
goto newseg_wrong_rate;
if (update) {
/* time progressed without data, see if we can fill the gap with
* some concealment data */
if (dec->segment.last_stop < start) {
GstClockTime duration;
duration = start - dec->segment.last_stop;
celt_dec_chain_parse_data (dec, NULL, dec->segment.last_stop,
duration);
}
}
/* now configure the values */
gst_segment_set_newsegment_full (&dec->segment, update,
rate, arate, GST_FORMAT_TIME, start, stop, time);
dec->granulepos = -1;
GST_DEBUG_OBJECT (dec, "segment now: cur = %" GST_TIME_FORMAT " [%"
GST_TIME_FORMAT " - %" GST_TIME_FORMAT "]",
GST_TIME_ARGS (dec->segment.last_stop),
GST_TIME_ARGS (dec->segment.start),
GST_TIME_ARGS (dec->segment.stop));
ret = gst_pad_push_event (dec->srcpad, event);
break;
}
default:
ret = gst_pad_event_default (pad, event);
break;
}
gst_object_unref (dec);
return ret;
/* ERRORS */
newseg_wrong_format:
{
GST_DEBUG_OBJECT (dec, "received non TIME newsegment");
gst_object_unref (dec);
return FALSE;
}
newseg_wrong_rate:
{
GST_DEBUG_OBJECT (dec, "negative rates not supported yet");
gst_object_unref (dec);
return FALSE;
}
}
static GstFlowReturn
celt_dec_chain_parse_header (GstCeltDec * dec, GstBuffer * buf)
{
GstCaps *caps;
gint error = CELT_OK;
/* get the header */
celt_header_from_packet ((const unsigned char *) GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf), &dec->header);
if (memcmp (dec->header.codec_id, "CELT ", 8) != 0)
goto invalid_header;
#ifdef HAVE_CELT_0_7
dec->mode =
celt_mode_create (dec->header.sample_rate,
dec->header.frame_size, &error);
#else
dec->mode =
celt_mode_create (dec->header.sample_rate, dec->header.nb_channels,
dec->header.frame_size, &error);
#endif
if (!dec->mode)
goto mode_init_failed;
/* initialize the decoder */
#ifdef HAVE_CELT_0_7
dec->state = celt_decoder_create (dec->mode, dec->header.nb_channels, &error);
#else
dec->state = celt_decoder_create (dec->mode);
#endif
if (!dec->state)
goto init_failed;
celt_mode_info (dec->mode, CELT_GET_FRAME_SIZE, &dec->frame_size);
dec->frame_duration = gst_util_uint64_scale_int (dec->frame_size,
GST_SECOND, dec->header.sample_rate);
/* set caps */
caps = gst_caps_new_simple ("audio/x-raw-int",
"rate", G_TYPE_INT, dec->header.sample_rate,
"channels", G_TYPE_INT, dec->header.nb_channels,
"signed", G_TYPE_BOOLEAN, TRUE,
"endianness", G_TYPE_INT, G_BYTE_ORDER,
"width", G_TYPE_INT, 16, "depth", G_TYPE_INT, 16, NULL);
GST_DEBUG_OBJECT (dec, "rate=%d channels=%d frame-size=%d",
dec->header.sample_rate, dec->header.nb_channels, dec->frame_size);
if (!gst_pad_set_caps (dec->srcpad, caps))
goto nego_failed;
gst_caps_unref (caps);
return GST_FLOW_OK;
/* ERRORS */
invalid_header:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("Invalid header"));
return GST_FLOW_ERROR;
}
mode_init_failed:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("Mode initialization failed: %d", error));
return GST_FLOW_ERROR;
}
init_failed:
{
#ifdef HAVE_CELT_0_7
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't initialize decoder: %d", error));
#else
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't initialize decoder"));
#endif
return GST_FLOW_ERROR;
}
nego_failed:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't negotiate format"));
gst_caps_unref (caps);
return GST_FLOW_NOT_NEGOTIATED;
}
}
static GstFlowReturn
celt_dec_chain_parse_comments (GstCeltDec * dec, GstBuffer * buf)
{
GstTagList *list;
gchar *ver, *encoder = NULL;
list = gst_tag_list_from_vorbiscomment_buffer (buf, NULL, 0, &encoder);
if (!list) {
GST_WARNING_OBJECT (dec, "couldn't decode comments");
list = gst_tag_list_new ();
}
if (encoder) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_ENCODER, encoder, NULL);
}
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_AUDIO_CODEC, "Celt", NULL);
ver = g_strndup (dec->header.codec_version, 20);
g_strstrip (ver);
if (ver != NULL && *ver != '\0') {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_ENCODER_VERSION, ver, NULL);
}
if (dec->header.bytes_per_packet > 0) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_BITRATE, (guint) dec->header.bytes_per_packet * 8, NULL);
}
GST_INFO_OBJECT (dec, "tags: %" GST_PTR_FORMAT, list);
gst_element_found_tags_for_pad (GST_ELEMENT (dec), dec->srcpad, list);
g_free (encoder);
g_free (ver);
return GST_FLOW_OK;
}
static GstFlowReturn
celt_dec_chain_parse_data (GstCeltDec * dec, GstBuffer * buf,
GstClockTime timestamp, GstClockTime duration)
{
GstFlowReturn res = GST_FLOW_OK;
gint size;
guint8 *data;
GstBuffer *outbuf;
gint16 *out_data;
gint error = CELT_OK;
2009-09-23 20:17:54 +00:00
int skip = 0;
if (timestamp != -1) {
dec->segment.last_stop = timestamp;
dec->granulepos = -1;
}
if (buf) {
data = GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
GST_DEBUG_OBJECT (dec, "received buffer of size %u", size);
if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf)
&& GST_BUFFER_OFFSET_END_IS_VALID (buf)) {
dec->granulepos = GST_BUFFER_OFFSET_END (buf);
GST_DEBUG_OBJECT (dec,
"Taking granulepos from upstream: %" G_GUINT64_FORMAT,
dec->granulepos);
}
/* copy timestamp */
} else {
/* concealment data, pass NULL as the bits parameters */
GST_DEBUG_OBJECT (dec, "creating concealment data");
data = NULL;
size = 0;
}
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if (dec->discont) {
celt_mode_info (dec->mode, CELT_GET_LOOKAHEAD, &skip);
}
res = gst_pad_alloc_buffer_and_set_caps (dec->srcpad,
GST_BUFFER_OFFSET_NONE, dec->frame_size * dec->header.nb_channels * 2,
GST_PAD_CAPS (dec->srcpad), &outbuf);
if (res != GST_FLOW_OK) {
GST_DEBUG_OBJECT (dec, "buf alloc flow: %s", gst_flow_get_name (res));
return res;
}
out_data = (gint16 *) GST_BUFFER_DATA (outbuf);
GST_LOG_OBJECT (dec, "decoding frame");
error = celt_decode (dec->state, data, size, out_data);
if (error != CELT_OK) {
GST_WARNING_OBJECT (dec, "Decoding error: %d", error);
return GST_FLOW_ERROR;
}
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if (skip > 0) {
GST_ERROR ("skipping %d samples", skip);
GST_BUFFER_DATA (outbuf) = GST_BUFFER_DATA (outbuf) +
skip * dec->header.nb_channels * 2;
GST_BUFFER_SIZE (outbuf) = GST_BUFFER_SIZE (outbuf) -
skip * dec->header.nb_channels * 2;
}
if (dec->granulepos == -1) {
if (dec->segment.format != GST_FORMAT_TIME) {
GST_WARNING_OBJECT (dec, "segment not initialized or not TIME format");
dec->granulepos = dec->frame_size;
} else {
dec->granulepos = gst_util_uint64_scale_int (dec->segment.last_stop,
dec->header.sample_rate, GST_SECOND) + dec->frame_size;
}
GST_DEBUG_OBJECT (dec, "granulepos=%" G_GINT64_FORMAT, dec->granulepos);
}
if (!GST_CLOCK_TIME_IS_VALID (timestamp))
timestamp = gst_util_uint64_scale_int (dec->granulepos - dec->frame_size,
GST_SECOND, dec->header.sample_rate);
GST_DEBUG_OBJECT (dec, "timestamp=%" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
GST_BUFFER_OFFSET (outbuf) = dec->granulepos - dec->frame_size;
GST_BUFFER_OFFSET_END (outbuf) = dec->granulepos;
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
GST_BUFFER_DURATION (outbuf) = dec->frame_duration;
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if (dec->discont) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
dec->discont = 0;
}
dec->granulepos += dec->frame_size;
dec->segment.last_stop += dec->frame_duration;
GST_LOG_OBJECT (dec, "pushing buffer with ts=%" GST_TIME_FORMAT ", dur=%"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (dec->frame_duration));
res = gst_pad_push (dec->srcpad, outbuf);
if (res != GST_FLOW_OK)
GST_DEBUG_OBJECT (dec, "flow: %s", gst_flow_get_name (res));
return res;
}
static GstFlowReturn
celt_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn res;
GstCeltDec *dec;
dec = GST_CELT_DEC (gst_pad_get_parent (pad));
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if (GST_BUFFER_IS_DISCONT (buf)) {
dec->discont = TRUE;
}
if (dec->packetno == 0)
res = celt_dec_chain_parse_header (dec, buf);
else if (dec->packetno == 1)
res = celt_dec_chain_parse_comments (dec, buf);
else if (dec->packetno <= 1 + dec->header.extra_headers)
res = GST_FLOW_OK;
else
res =
celt_dec_chain_parse_data (dec, buf, GST_BUFFER_TIMESTAMP (buf),
GST_BUFFER_DURATION (buf));
dec->packetno++;
gst_buffer_unref (buf);
gst_object_unref (dec);
return res;
}
static GstStateChangeReturn
celt_dec_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstCeltDec *dec = GST_CELT_DEC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
case GST_STATE_CHANGE_READY_TO_PAUSED:
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
default:
break;
}
ret = parent_class->change_state (element, transition);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_celt_dec_reset (dec);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}