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/x-amr-nb, "
"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 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, GstQueryType type,
GstFormat * fmt, gint64 * value);
static void gst_amrnbparse_loop (GstElement * element);
static GstElementStateReturn gst_amrnbparse_state_change (GstElement * element);
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)
{
GST_FLAG_SET (amrnbparse, GST_ELEMENT_EVENT_AWARE);
/* create the sink pad */
amrnbparse->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get (&sink_template),
"sink");
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_pad_set_formats_function (amrnbparse->srcpad,
GST_DEBUG_FUNCPTR (gst_amrnbparse_formats));
gst_element_add_pad (GST_ELEMENT (amrnbparse), amrnbparse->srcpad);
gst_element_set_loop_function (GST_ELEMENT (amrnbparse), gst_amrnbparse_loop);
/* init rest */
amrnbparse->ts = 0;
}
/*
* Position querying.
*/
static const GstFormat *
gst_amrnbparse_formats (GstPad * pad)
{
static const GstFormat list[] = {
GST_FORMAT_TIME,
0
};
return list;
}
static const GstQueryType *
gst_amrnbparse_querytypes (GstPad * pad)
{
static const GstQueryType list[] = {
GST_QUERY_POSITION,
GST_QUERY_TOTAL,
0
};
return list;
}
static gboolean
gst_amrnbparse_query (GstPad * pad, GstQueryType type,
GstFormat * fmt, gint64 * value)
{
GstAmrnbParse *amrnbparse = GST_AMRNBPARSE (gst_pad_get_parent (pad));
gboolean res = TRUE;
if (*fmt != GST_FORMAT_TIME)
return FALSE;
switch (type) {
case GST_QUERY_POSITION:
*value = amrnbparse->ts;
break;
case GST_QUERY_TOTAL:{
gint64 pos = gst_bytestream_tell (amrnbparse->bs),
tot = gst_bytestream_length (amrnbparse->bs);
*value = amrnbparse->ts * ((gdouble) tot / pos);
break;
}
default:
res = FALSE;
break;
}
return res;
}
/*
* Data reading.
*/
static gboolean
gst_amrnbparse_handle_event (GstAmrnbParse * amrnbparse, GstEvent * event)
{
gboolean res;
if (!event) {
GST_ELEMENT_ERROR (amrnbparse, RESOURCE, READ, (NULL), (NULL));
return FALSE;
}
GST_LOG ("handling event %d", GST_EVENT_TYPE (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
case GST_EVENT_INTERRUPT:
res = FALSE;
break;
case GST_EVENT_DISCONTINUOUS:
default:
res = TRUE;
break;
}
gst_pad_event_default (amrnbparse->sinkpad, event);
return res;
}
static guint8 *
gst_amrnbparse_reserve (GstAmrnbParse * amrnbparse, gint size)
{
gint read;
guint8 *data;
GST_DEBUG ("Trying to read %d bytes", size);
do {
if ((read = gst_bytestream_peek_bytes (amrnbparse->bs,
&data, size)) != size) {
GstEvent *event;
guint32 avail;
gst_bytestream_get_status (amrnbparse->bs, &avail, &event);
if (!gst_amrnbparse_handle_event (amrnbparse, event))
return NULL;
}
} while (read < size);
GST_DEBUG ("Read %d bytes of data", read);
return data;
}
static void
gst_amrnbparse_loop (GstElement * element)
{
const gint block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5,
0, 0, 0, 0, 0, 0, 0
};
GstAmrnbParse *amrnbparse = GST_AMRNBPARSE (element);
GstBuffer *buf;
guint8 *data;
gint block, mode, read;
if (!(data = gst_amrnbparse_reserve (amrnbparse, 1)))
return;
/* init */
if (amrnbparse->ts == 0 && data[0] == '#') {
if (!(data = gst_amrnbparse_reserve (amrnbparse, 6)))
return;
if (!memcmp (data, "#!AMR", 5)) {
GST_LOG ("Found header");
gst_bytestream_flush_fast (amrnbparse->bs, 5);
data += 5;
}
}
/* get size */
mode = (data[0] >> 3) & 0x0F;
block = block_size[mode] + 1;
if (!gst_amrnbparse_reserve (amrnbparse, block))
return;
read = gst_bytestream_read (amrnbparse->bs, &buf, block);
g_assert (read == block);
/* output */
GST_BUFFER_DURATION (buf) = GST_SECOND * 160 / 8000;
GST_BUFFER_TIMESTAMP (buf) = amrnbparse->ts;
amrnbparse->ts += GST_BUFFER_DURATION (buf);
GST_DEBUG ("Pushing %d bytes of data", block);
gst_pad_push (amrnbparse->srcpad, GST_DATA (buf));
}
static GstElementStateReturn
gst_amrnbparse_state_change (GstElement * element)
{
GstAmrnbParse *amrnbparse = GST_AMRNBPARSE (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
if (!(amrnbparse->bs = gst_bytestream_new (amrnbparse->sinkpad)))
return GST_STATE_FAILURE;
break;
case GST_STATE_PAUSED_TO_READY:
amrnbparse->ts = 0;
break;
case GST_STATE_READY_TO_NULL:
gst_bytestream_destroy (amrnbparse->bs);
break;
default:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}