gstreamer/ext/amrnb/amrnbparse.c

784 lines
22 KiB
C

/* GStreamer Adaptive Multi-Rate Narrow-Band (AMR-NB) plugin
* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.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.
*/
/**
* SECTION:element-amrnbparse
* @see_also: #GstAmrnbDec, #GstAmrnbEnc
*
* AMR narrowband bitstream parser.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch filesrc location=abc.amr ! amrnbparse ! amrnbdec ! audioresample ! audioconvert ! alsasink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "amrnbparse.h"
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/AMR, " "rate = (int) 8000, " "channels = (int) 1")
);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-amr-nb-sh")
);
GST_DEBUG_CATEGORY_STATIC (gst_amrnbparse_debug);
#define GST_CAT_DEFAULT gst_amrnbparse_debug
static const gint block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5,
0, 0, 0, 0, 0, 0, 0
};
#define AMRNB_HEADER_SIZE 6
#define AMRNB_HEADER_STR "#!AMR\n"
/*static const GstFormat *gst_amrnbparse_formats (GstPad * pad);*/
static const GstQueryType *gst_amrnbparse_querytypes (GstPad * pad);
static gboolean gst_amrnbparse_query (GstPad * pad, GstQuery * query);
static gboolean gst_amrnbparse_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_amrnbparse_src_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_amrnbparse_chain (GstPad * pad, GstBuffer * buffer);
static void gst_amrnbparse_loop (GstPad * pad);
static gboolean gst_amrnbparse_sink_activate (GstPad * sinkpad);
static gboolean gst_amrnbparse_sink_activate_pull (GstPad * sinkpad,
gboolean active);
static gboolean gst_amrnbparse_sink_activate_push (GstPad * sinkpad,
gboolean active);
static GstStateChangeReturn gst_amrnbparse_state_change (GstElement * element,
GstStateChange transition);
static void gst_amrnbparse_finalize (GObject * object);
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gst_amrnbparse_debug, "amrnbparse", 0, "AMR-NB audio stream parser");
GST_BOILERPLATE_FULL (GstAmrnbParse, gst_amrnbparse, GstElement,
GST_TYPE_ELEMENT, _do_init);
static void
gst_amrnbparse_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstElementDetails details = GST_ELEMENT_DETAILS ("AMR-NB audio stream parser",
"Codec/Parser/Audio",
"Adaptive Multi-Rate Narrow-Band audio parser",
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_details (element_class, &details);
}
static void
gst_amrnbparse_class_init (GstAmrnbParseClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
object_class->finalize = gst_amrnbparse_finalize;
element_class->change_state = GST_DEBUG_FUNCPTR (gst_amrnbparse_state_change);
}
static void
gst_amrnbparse_init (GstAmrnbParse * amrnbparse, GstAmrnbParseClass * klass)
{
/* create the sink pad */
amrnbparse->sinkpad =
gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (amrnbparse->sinkpad,
GST_DEBUG_FUNCPTR (gst_amrnbparse_chain));
gst_pad_set_event_function (amrnbparse->sinkpad,
GST_DEBUG_FUNCPTR (gst_amrnbparse_sink_event));
gst_pad_set_activate_function (amrnbparse->sinkpad,
gst_amrnbparse_sink_activate);
gst_pad_set_activatepull_function (amrnbparse->sinkpad,
gst_amrnbparse_sink_activate_pull);
gst_pad_set_activatepush_function (amrnbparse->sinkpad,
gst_amrnbparse_sink_activate_push);
gst_element_add_pad (GST_ELEMENT (amrnbparse), amrnbparse->sinkpad);
/* create the src pad */
amrnbparse->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_set_event_function (amrnbparse->srcpad,
GST_DEBUG_FUNCPTR (gst_amrnbparse_src_event));
gst_pad_set_query_function (amrnbparse->srcpad,
GST_DEBUG_FUNCPTR (gst_amrnbparse_query));
gst_pad_set_query_type_function (amrnbparse->srcpad,
GST_DEBUG_FUNCPTR (gst_amrnbparse_querytypes));
gst_pad_use_fixed_caps (amrnbparse->srcpad);
gst_element_add_pad (GST_ELEMENT (amrnbparse), amrnbparse->srcpad);
amrnbparse->adapter = gst_adapter_new ();
/* init rest */
amrnbparse->ts = 0;
}
static void
gst_amrnbparse_finalize (GObject * object)
{
GstAmrnbParse *amrnbparse;
amrnbparse = GST_AMRNBPARSE (object);
gst_adapter_clear (amrnbparse->adapter);
g_object_unref (amrnbparse->adapter);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/*
* Position querying.
*/
#if 0
static const GstFormat *
gst_amrnbparse_formats (GstPad * pad)
{
static const GstFormat list[] = {
GST_FORMAT_TIME,
0
};
return list;
}
#endif
static const GstQueryType *
gst_amrnbparse_querytypes (GstPad * pad)
{
static const GstQueryType list[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
0
};
return list;
}
static gboolean
gst_amrnbparse_query (GstPad * pad, GstQuery * query)
{
GstAmrnbParse *amrnbparse;
gboolean res = TRUE;
amrnbparse = GST_AMRNBPARSE (GST_PAD_PARENT (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gint64 cur;
gst_query_parse_position (query, &format, NULL);
if (format != GST_FORMAT_TIME)
return FALSE;
cur = amrnbparse->ts;
gst_query_set_position (query, GST_FORMAT_TIME, cur);
res = TRUE;
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
gint64 tot;
GstPad *peer;
gst_query_parse_duration (query, &format, NULL);
if (format != GST_FORMAT_TIME)
return FALSE;
tot = -1;
res = FALSE;
peer = gst_pad_get_peer (amrnbparse->sinkpad);
if (peer) {
GstFormat pformat;
gint64 ptot;
pformat = GST_FORMAT_BYTES;
res = gst_pad_query_duration (peer, &pformat, &ptot);
if (res && amrnbparse->block) {
tot =
gst_util_uint64_scale_int (ptot, 20 * GST_MSECOND,
amrnbparse->block);
}
gst_object_unref (GST_OBJECT (peer));
}
gst_query_set_duration (query, GST_FORMAT_TIME, tot);
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
return res;
}
static gboolean
gst_amrnbparse_handle_pull_seek (GstAmrnbParse * amrnbparse, GstPad * pad,
GstEvent * event)
{
GstFormat format;
gdouble rate;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gint64 byte_cur = -1;
gboolean flush;
gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur,
&stop_type, &stop);
GST_DEBUG_OBJECT (amrnbparse, "Performing seek to %" GST_TIME_FORMAT,
GST_TIME_ARGS (cur));
/* For any format other than TIME, see if upstream handles
* it directly or fail. For TIME, try upstream, but do it ourselves if
* it fails upstream */
if (format != GST_FORMAT_TIME) {
return gst_pad_push_event (amrnbparse->sinkpad, event);
} else {
if (gst_pad_push_event (amrnbparse->sinkpad, event))
return TRUE;
}
flush = flags & GST_SEEK_FLAG_FLUSH;
/* send flush start */
if (flush)
gst_pad_push_event (amrnbparse->sinkpad, gst_event_new_flush_start ());
/* we only handle FLUSH seeks at the moment */
else
return FALSE;
/* grab streaming lock, this should eventually be possible, either
* because the task is paused or our streaming thread stopped
* because our peer is flushing. */
GST_PAD_STREAM_LOCK (amrnbparse->sinkpad);
/* Convert the TIME to the appropriate BYTE position at which to resume
* decoding. */
cur = cur / (20 * GST_MSECOND) * (20 * GST_MSECOND);
if (cur != -1)
byte_cur = amrnbparse->block * (cur / 20 / GST_MSECOND) + AMRNB_HEADER_SIZE;
amrnbparse->offset = byte_cur;
amrnbparse->ts = cur;
GST_DEBUG_OBJECT (amrnbparse, "Seeking to byte range %" G_GINT64_FORMAT,
byte_cur);
/* and prepare to continue streaming */
/* send flush stop, peer will accept data and events again. We
* are not yet providing data as we still have the STREAM_LOCK. */
gst_pad_push_event (amrnbparse->sinkpad, gst_event_new_flush_stop ());
gst_pad_push_event (amrnbparse->srcpad, gst_event_new_new_segment (FALSE,
rate, format, cur, -1, cur));
/* and restart the task in case it got paused explicitely or by
* the FLUSH_START event we pushed out. */
gst_pad_start_task (amrnbparse->sinkpad,
(GstTaskFunction) gst_amrnbparse_loop, amrnbparse->sinkpad);
/* and release the lock again so we can continue streaming */
GST_PAD_STREAM_UNLOCK (amrnbparse->sinkpad);
return TRUE;
}
static gboolean
gst_amrnbparse_handle_push_seek (GstAmrnbParse * amrnbparse, GstPad * pad,
GstEvent * event)
{
GstFormat format;
gdouble rate;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gint64 byte_cur = -1, byte_stop = -1;
gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur,
&stop_type, &stop);
GST_DEBUG_OBJECT (amrnbparse, "Performing seek to %" GST_TIME_FORMAT,
GST_TIME_ARGS (cur));
/* For any format other than TIME, see if upstream handles
* it directly or fail. For TIME, try upstream, but do it ourselves if
* it fails upstream */
if (format != GST_FORMAT_TIME) {
return gst_pad_push_event (amrnbparse->sinkpad, event);
} else {
if (gst_pad_push_event (amrnbparse->sinkpad, event))
return TRUE;
}
/* Convert the TIME to the appropriate BYTE position at which to resume
* decoding. */
cur = cur / (20 * GST_MSECOND) * (20 * GST_MSECOND);
if (cur != -1)
byte_cur = amrnbparse->block * (cur / 20 / GST_MSECOND) + AMRNB_HEADER_SIZE;
if (stop != -1)
byte_stop =
amrnbparse->block * (stop / 20 / GST_MSECOND) + AMRNB_HEADER_SIZE;
amrnbparse->ts = cur;
GST_DEBUG_OBJECT (amrnbparse, "Seeking to byte range %" G_GINT64_FORMAT
" to %" G_GINT64_FORMAT, byte_cur, byte_stop);
/* Send BYTE based seek upstream */
event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags, cur_type,
byte_cur, stop_type, byte_stop);
return gst_pad_push_event (amrnbparse->sinkpad, event);
}
static gboolean
gst_amrnbparse_src_event (GstPad * pad, GstEvent * event)
{
GstAmrnbParse *amrnbparse = GST_AMRNBPARSE (gst_pad_get_parent (pad));
gboolean res;
GST_DEBUG_OBJECT (amrnbparse, "handling event %d", GST_EVENT_TYPE (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
if (amrnbparse->seek_handler)
res = amrnbparse->seek_handler (amrnbparse, pad, event);
else
res = FALSE;
break;
default:
res = gst_pad_push_event (amrnbparse->sinkpad, event);
break;
}
gst_object_unref (amrnbparse);
return res;
}
/*
* Data reading.
*/
static gboolean
gst_amrnbparse_sink_event (GstPad * pad, GstEvent * event)
{
GstAmrnbParse *amrnbparse;
gboolean res;
amrnbparse = GST_AMRNBPARSE (gst_pad_get_parent (pad));
GST_LOG ("handling event %d", GST_EVENT_TYPE (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
res = gst_pad_push_event (amrnbparse->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_adapter_clear (amrnbparse->adapter);
gst_segment_init (&amrnbparse->segment, GST_FORMAT_TIME);
res = gst_pad_push_event (amrnbparse->srcpad, event);
break;
case GST_EVENT_EOS:
res = gst_pad_push_event (amrnbparse->srcpad, event);
break;
case GST_EVENT_NEWSEGMENT:
{
/* eat for now, we send a newsegment at start with infinite
* duration. */
gst_event_unref (event);
res = TRUE;
break;
}
default:
res = gst_pad_push_event (amrnbparse->srcpad, event);
break;
}
gst_object_unref (amrnbparse);
return res;
}
/* streaming mode */
static GstFlowReturn
gst_amrnbparse_chain (GstPad * pad, GstBuffer * buffer)
{
GstAmrnbParse *amrnbparse;
GstFlowReturn res;
gint mode;
const guint8 *data;
GstBuffer *out;
GstClockTime timestamp;
amrnbparse = GST_AMRNBPARSE (GST_PAD_PARENT (pad));
timestamp = GST_BUFFER_TIMESTAMP (buffer);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
GST_DEBUG_OBJECT (amrnbparse, "Lock on timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
amrnbparse->ts = timestamp;
}
gst_adapter_push (amrnbparse->adapter, buffer);
res = GST_FLOW_OK;
/* init */
if (amrnbparse->need_header) {
GstEvent *segev;
GstCaps *caps;
if (gst_adapter_available (amrnbparse->adapter) < AMRNB_HEADER_SIZE)
goto done;
data = gst_adapter_peek (amrnbparse->adapter, AMRNB_HEADER_SIZE);
if (memcmp (data, AMRNB_HEADER_STR, AMRNB_HEADER_SIZE) != 0)
goto done;
gst_adapter_flush (amrnbparse->adapter, AMRNB_HEADER_SIZE);
amrnbparse->need_header = FALSE;
caps = gst_caps_new_simple ("audio/AMR",
"rate", G_TYPE_INT, 8000, "channels", G_TYPE_INT, 1, NULL);
gst_pad_set_caps (amrnbparse->srcpad, caps);
gst_caps_unref (caps);
GST_DEBUG_OBJECT (amrnbparse, "Sending first segment");
segev = gst_event_new_new_segment_full (FALSE, 1.0, 1.0,
GST_FORMAT_TIME, 0, -1, 0);
gst_pad_push_event (amrnbparse->srcpad, segev);
}
while (TRUE) {
if (gst_adapter_available (amrnbparse->adapter) < 1)
break;
data = gst_adapter_peek (amrnbparse->adapter, 1);
/* get size */
mode = (data[0] >> 3) & 0x0F;
amrnbparse->block = block_size[mode] + 1; /* add one for the mode */
if (gst_adapter_available (amrnbparse->adapter) < amrnbparse->block)
break;
out = gst_buffer_new_and_alloc (amrnbparse->block);
data = gst_adapter_peek (amrnbparse->adapter, amrnbparse->block);
memcpy (GST_BUFFER_DATA (out), data, amrnbparse->block);
/* timestamp, all constants that won't overflow */
GST_BUFFER_DURATION (out) = GST_SECOND * 160 / 8000;
GST_BUFFER_TIMESTAMP (out) = amrnbparse->ts;
if (GST_CLOCK_TIME_IS_VALID (amrnbparse->ts))
amrnbparse->ts += GST_BUFFER_DURATION (out);
gst_buffer_set_caps (out, GST_PAD_CAPS (amrnbparse->srcpad));
GST_DEBUG_OBJECT (amrnbparse, "Pushing %d bytes of data",
amrnbparse->block);
res = gst_pad_push (amrnbparse->srcpad, out);
gst_adapter_flush (amrnbparse->adapter, amrnbparse->block);
}
done:
return res;
}
static gboolean
gst_amrnbparse_pull_header (GstAmrnbParse * amrnbparse)
{
GstBuffer *buffer;
GstFlowReturn ret;
guint8 *data;
gint size;
ret = gst_pad_pull_range (amrnbparse->sinkpad, G_GUINT64_CONSTANT (0),
AMRNB_HEADER_SIZE, &buffer);
if (ret != GST_FLOW_OK)
return FALSE;
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
if (size < AMRNB_HEADER_SIZE)
goto not_enough;
if (memcmp (data, AMRNB_HEADER_STR, AMRNB_HEADER_SIZE))
goto no_header;
gst_buffer_unref (buffer);
amrnbparse->offset = AMRNB_HEADER_SIZE;
return TRUE;
not_enough:
{
gst_buffer_unref (buffer);
return FALSE;
}
no_header:
{
gst_buffer_unref (buffer);
return FALSE;
}
}
/* random access mode, could just read a fixed size buffer and push it to
* the chain function but we don't... */
static void
gst_amrnbparse_loop (GstPad * pad)
{
GstAmrnbParse *amrnbparse;
GstBuffer *buffer;
guint8 *data;
gint size;
gint mode;
GstFlowReturn ret;
amrnbparse = GST_AMRNBPARSE (GST_PAD_PARENT (pad));
/* init */
if (G_UNLIKELY (amrnbparse->need_header)) {
GstCaps *caps;
if (!gst_amrnbparse_pull_header (amrnbparse)) {
GST_ELEMENT_ERROR (amrnbparse, STREAM, WRONG_TYPE, (NULL), (NULL));
GST_LOG_OBJECT (amrnbparse, "could not read header");
goto need_pause;
}
caps = gst_caps_new_simple ("audio/AMR",
"rate", G_TYPE_INT, 8000, "channels", G_TYPE_INT, 1, NULL);
gst_pad_set_caps (amrnbparse->srcpad, caps);
gst_caps_unref (caps);
GST_DEBUG_OBJECT (amrnbparse, "Sending newsegment event");
gst_pad_push_event (amrnbparse->srcpad,
gst_event_new_new_segment_full (FALSE, 1.0, 1.0,
GST_FORMAT_TIME, 0, -1, 0));
amrnbparse->need_header = FALSE;
}
ret =
gst_pad_pull_range (amrnbparse->sinkpad, amrnbparse->offset, 1, &buffer);
if (ret == GST_FLOW_UNEXPECTED)
goto eos;
else if (ret != GST_FLOW_OK)
goto need_pause;
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
/* EOS */
if (size < 1) {
gst_buffer_unref (buffer);
goto eos;
}
/* get size */
mode = (data[0] >> 3) & 0x0F;
amrnbparse->block = block_size[mode] + 1; /* add one for the mode */
gst_buffer_unref (buffer);
ret =
gst_pad_pull_range (amrnbparse->sinkpad, amrnbparse->offset,
amrnbparse->block, &buffer);
if (ret == GST_FLOW_UNEXPECTED)
goto eos;
else if (ret != GST_FLOW_OK)
goto need_pause;
if (GST_BUFFER_SIZE (buffer) < amrnbparse->block) {
gst_buffer_unref (buffer);
goto eos;
}
amrnbparse->offset += amrnbparse->block;
/* output */
buffer = gst_buffer_make_metadata_writable (buffer);
GST_BUFFER_DURATION (buffer) = GST_SECOND * 160 / 8000;
GST_BUFFER_TIMESTAMP (buffer) = amrnbparse->ts;
gst_buffer_set_caps (buffer, GST_PAD_CAPS (amrnbparse->srcpad));
GST_DEBUG_OBJECT (amrnbparse, "Pushing %2d bytes, ts=%" GST_TIME_FORMAT,
amrnbparse->block, GST_TIME_ARGS (amrnbparse->ts));
ret = gst_pad_push (amrnbparse->srcpad, buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
GST_DEBUG_OBJECT (amrnbparse, "Flow: %s", gst_flow_get_name (ret));
if (GST_FLOW_IS_FATAL (ret) || ret == GST_FLOW_NOT_LINKED) {
if (ret == GST_FLOW_UNEXPECTED) {
/* we don't do seeking yet, so no segment flag to check here either */
if (0) {
/* post segment_done message here one day when seeking works */
} else {
GST_LOG_OBJECT (amrnbparse, "Sending EOS at end of segment");
gst_pad_push_event (amrnbparse->srcpad, gst_event_new_eos ());
}
} else {
GST_ELEMENT_ERROR (amrnbparse, STREAM, FAILED, (NULL),
("streaming stopped, reason: %s", gst_flow_get_name (ret)));
gst_pad_push_event (amrnbparse->srcpad, gst_event_new_eos ());
}
}
goto need_pause;
}
amrnbparse->ts += GST_BUFFER_DURATION (buffer);
return;
need_pause:
{
GST_LOG_OBJECT (amrnbparse, "pausing task");
gst_pad_pause_task (pad);
return;
}
eos:
{
GST_LOG_OBJECT (amrnbparse, "pausing task (eos)");
gst_pad_push_event (amrnbparse->srcpad, gst_event_new_eos ());
gst_pad_pause_task (pad);
return;
}
}
static gboolean
gst_amrnbparse_sink_activate (GstPad * sinkpad)
{
gboolean result = FALSE;
GstAmrnbParse *amrnbparse;
amrnbparse = GST_AMRNBPARSE (gst_pad_get_parent (sinkpad));
if (gst_pad_check_pull_range (sinkpad)) {
GST_DEBUG ("Trying to activate in pull mode");
amrnbparse->seekable = TRUE;
amrnbparse->ts = 0;
result = gst_pad_activate_pull (sinkpad, TRUE);
} else {
GST_DEBUG ("Try to activate in push mode");
amrnbparse->seekable = FALSE;
result = gst_pad_activate_push (sinkpad, TRUE);
}
gst_object_unref (amrnbparse);
return result;
}
static gboolean
gst_amrnbparse_sink_activate_push (GstPad * sinkpad, gboolean active)
{
GstAmrnbParse *amrnbparse = GST_AMRNBPARSE (gst_pad_get_parent (sinkpad));
if (active) {
amrnbparse->seek_handler = gst_amrnbparse_handle_push_seek;
} else {
amrnbparse->seek_handler = NULL;
}
gst_object_unref (amrnbparse);
return TRUE;
}
static gboolean
gst_amrnbparse_sink_activate_pull (GstPad * sinkpad, gboolean active)
{
gboolean result;
GstAmrnbParse *amrnbparse = GST_AMRNBPARSE (gst_pad_get_parent (sinkpad));
if (active) {
amrnbparse->seek_handler = gst_amrnbparse_handle_pull_seek;
result = gst_pad_start_task (sinkpad,
(GstTaskFunction) gst_amrnbparse_loop, sinkpad);
} else {
amrnbparse->seek_handler = NULL;
result = gst_pad_stop_task (sinkpad);
}
gst_object_unref (amrnbparse);
return result;
}
static GstStateChangeReturn
gst_amrnbparse_state_change (GstElement * element, GstStateChange transition)
{
GstAmrnbParse *amrnbparse;
GstStateChangeReturn ret;
amrnbparse = GST_AMRNBPARSE (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
amrnbparse->need_header = TRUE;
amrnbparse->ts = -1;
amrnbparse->block = 0;
gst_segment_init (&amrnbparse->segment, GST_FORMAT_TIME);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}