gstreamer/ext/amrnb/amrnbparse.c

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/* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "amrnbparse.h"
GST_DEBUG_CATEGORY_STATIC (amrnbparse_debug);
#define GST_CAT_DEFAULT amrnbparse_debug
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")
);
static const gint block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5,
0, 0, 0, 0, 0, 0, 0
};
static void gst_amrnbparse_base_init (GstAmrnbParseClass * klass);
static void gst_amrnbparse_class_init (GstAmrnbParseClass * klass);
static void gst_amrnbparse_init (GstAmrnbParse * amrnbparse);
//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_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 GstStateChangeReturn gst_amrnbparse_state_change (GstElement * element,
GstStateChange transition);
static GstElementClass *parent_class = NULL;
GType
gst_amrnbparse_get_type (void)
{
static GType amrnbparse_type = 0;
if (!amrnbparse_type) {
static const GTypeInfo amrnbparse_info = {
sizeof (GstAmrnbParseClass),
(GBaseInitFunc) gst_amrnbparse_base_init,
NULL,
(GClassInitFunc) gst_amrnbparse_class_init,
NULL,
NULL,
sizeof (GstAmrnbParse),
0,
(GInstanceInitFunc) gst_amrnbparse_init,
};
amrnbparse_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstAmrnbParse", &amrnbparse_info, 0);
}
return amrnbparse_type;
}
static void
gst_amrnbparse_base_init (GstAmrnbParseClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstElementDetails gst_amrnbparse_details = {
"AMR-NB 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, &gst_amrnbparse_details);
}
static void
gst_amrnbparse_class_init (GstAmrnbParseClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
element_class->change_state = gst_amrnbparse_state_change;
GST_DEBUG_CATEGORY_INIT (amrnbparse_debug,
"amrnbparse", 0, "AMR-NB stream parsing");
}
static void
gst_amrnbparse_init (GstAmrnbParse * amrnbparse)
{
/* create the sink pad */
amrnbparse->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get (&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_event));
/* gst_pad_set_loop_function (amrnbparse->sinkpad,
GST_DEBUG_FUNCPTR (gst_amrnbparse_loop));
*/
gst_pad_set_activate_function (amrnbparse->sinkpad,
gst_amrnbparse_sink_activate);
gst_element_add_pad (GST_ELEMENT (amrnbparse), amrnbparse->sinkpad);
/* create the src pad */
amrnbparse->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get (&src_template),
"src");
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_element_add_pad (GST_ELEMENT (amrnbparse), amrnbparse->srcpad);
amrnbparse->adapter = gst_adapter_new ();
/* init rest */
amrnbparse->ts = 0;
}
/*
* 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,
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;
peer = gst_pad_get_peer (amrnbparse->sinkpad);
if (peer) {
GstFormat pformat;
gint64 pcur, ptot;
pformat = GST_FORMAT_BYTES;
res = gst_pad_query_position (peer, &pformat, &pcur);
res = gst_pad_query_duration (peer, &pformat, &ptot);
gst_object_unref (GST_OBJECT (peer));
if (res) {
tot = amrnbparse->ts * ((gdouble) ptot / pcur);
}
}
gst_query_set_duration (query, GST_FORMAT_TIME, tot);
res = TRUE;
break;
}
default:
res = FALSE;
break;
}
return res;
}
/*
* Data reading.
*/
static gboolean
gst_amrnbparse_event (GstPad * pad, GstEvent * event)
{
GstAmrnbParse *amrnbparse;
gboolean res;
amrnbparse = GST_AMRNBPARSE (GST_PAD_PARENT (pad));
GST_LOG ("handling event %d", GST_EVENT_TYPE (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
default:
break;
}
res = gst_pad_event_default (amrnbparse->sinkpad, event);
return res;
}
/* streaming mode */
static GstFlowReturn
gst_amrnbparse_chain (GstPad * pad, GstBuffer * buffer)
{
GstAmrnbParse *amrnbparse;
GstFlowReturn res;
gint block, mode;
const guint8 *data;
GstBuffer *out;
amrnbparse = GST_AMRNBPARSE (GST_PAD_PARENT (pad));
gst_adapter_push (amrnbparse->adapter, buffer);
res = GST_FLOW_OK;
/* init */
if (amrnbparse->need_header) {
if (gst_adapter_available (amrnbparse->adapter) < 6)
goto done;
data = gst_adapter_peek (amrnbparse->adapter, 6);
if (memcmp (data, "#!AMR\n", 6) != 0)
goto done;
gst_adapter_flush (amrnbparse->adapter, 6);
amrnbparse->need_header = FALSE;
}
while (TRUE) {
if (gst_adapter_available (amrnbparse->adapter) < 1)
break;
data = gst_adapter_peek (amrnbparse->adapter, 1);
/* get size */
mode = (data[0] >> 3) & 0x0F;
block = block_size[mode] + 1; /* add one for the mode */
if (gst_adapter_available (amrnbparse->adapter) < block)
break;
out = gst_buffer_new_and_alloc (block);
data = gst_adapter_peek (amrnbparse->adapter, block);
memcpy (GST_BUFFER_DATA (out), data, block);
/* output */
GST_BUFFER_DURATION (out) = GST_SECOND * 160 / 8000;
GST_BUFFER_TIMESTAMP (out) = amrnbparse->ts;
amrnbparse->ts += GST_BUFFER_DURATION (out);
gst_buffer_set_caps (out,
(GstCaps *) gst_pad_get_pad_template_caps (amrnbparse->srcpad));
GST_DEBUG ("Pushing %d bytes of data", block);
res = gst_pad_push (amrnbparse->srcpad, out);
gst_adapter_flush (amrnbparse->adapter, block);
}
done:
return res;
}
static gboolean
gst_amrnbparse_read_header (GstAmrnbParse * amrnbparse)
{
GstBuffer *buffer;
GstFlowReturn ret;
guint8 *data;
gint size;
ret =
gst_pad_pull_range (amrnbparse->sinkpad, amrnbparse->offset, 6, &buffer);
if (ret != GST_FLOW_OK)
return FALSE;
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
if (size < 6)
goto not_enough;
if (memcmp (data, "#!AMR\n", 6))
goto no_header;
amrnbparse->offset += 6;
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 block, mode;
GstFlowReturn ret;
amrnbparse = GST_AMRNBPARSE (GST_PAD_PARENT (pad));
/* init */
if (amrnbparse->need_header) {
gboolean got_header;
got_header = gst_amrnbparse_read_header (amrnbparse);
if (!got_header) {
GST_LOG_OBJECT (amrnbparse, "could not read header");
goto need_pause;
}
amrnbparse->need_header = FALSE;
}
ret =
gst_pad_pull_range (amrnbparse->sinkpad, amrnbparse->offset, 1, &buffer);
if (ret != GST_FLOW_OK)
goto need_pause;
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
/* EOS */
if (size < 1)
goto eos;
/* get size */
mode = (data[0] >> 3) & 0x0F;
block = block_size[mode] + 1; /* add one for the mode */
gst_buffer_unref (buffer);
ret =
gst_pad_pull_range (amrnbparse->sinkpad, amrnbparse->offset, block,
&buffer);
if (ret != GST_FLOW_OK)
goto need_pause;
amrnbparse->offset += block;
/* output */
GST_BUFFER_DURATION (buffer) = GST_SECOND * 160 / 8000;
GST_BUFFER_TIMESTAMP (buffer) = amrnbparse->ts;
amrnbparse->ts += GST_BUFFER_DURATION (buffer);
gst_buffer_set_caps (buffer,
(GstCaps *) gst_pad_get_pad_template_caps (amrnbparse->srcpad));
GST_DEBUG ("Pushing %d bytes of data", block);
ret = gst_pad_push (amrnbparse->srcpad, buffer);
if (ret != GST_FLOW_OK)
goto need_pause;
return;
need_pause:
{
GST_LOG_OBJECT (amrnbparse, "pausing task");
gst_pad_pause_task (pad);
return;
}
eos:
{
GST_LOG_OBJECT (amrnbparse, "pausing task");
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;
GstActivateMode mode;
amrnbparse = GST_AMRNBPARSE (GST_OBJECT_PARENT (sinkpad));
GST_LOCK (sinkpad);
mode = GST_PAD_ACTIVATE_MODE (sinkpad);
GST_UNLOCK (sinkpad);
switch (mode) {
case GST_ACTIVATE_PUSH:
amrnbparse->seekable = FALSE;
result = TRUE;
break;
case GST_ACTIVATE_PULL:
/*gst_pad_peer_set_active (sinkpad, mode); */
amrnbparse->need_header = TRUE;
amrnbparse->seekable = TRUE;
amrnbparse->ts = 0;
result = gst_pad_start_task (sinkpad,
(GstTaskFunction) gst_amrnbparse_loop, sinkpad);
break;
case GST_ACTIVATE_NONE:
/* step 1, unblock clock sync (if any) */
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (sinkpad);
break;
}
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:
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;
}