mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-24 02:31:03 +00:00
6717c86061
For more optimised RTP packet handling: means we don't need to map the input buffer again but can just re-use the mapping the base class has already done. https://bugzilla.gnome.org/show_bug.cgi?id=750235
388 lines
12 KiB
C
388 lines
12 KiB
C
/* GStreamer
|
|
* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
|
|
* Copyright (C) 2005 Edgard Lima <edgard.lima@indt.org.br>
|
|
* Copyright (C) 2005 Zeeshan Ali <zeenix@gmail.com>
|
|
* Copyright (C) 2008 Axis Communications <dev-gstreamer@axis.com>
|
|
*
|
|
* 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., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <gst/rtp/gstrtpbuffer.h>
|
|
|
|
#include "gstrtpg726depay.h"
|
|
|
|
GST_DEBUG_CATEGORY_STATIC (rtpg726depay_debug);
|
|
#define GST_CAT_DEFAULT (rtpg726depay_debug)
|
|
|
|
#define DEFAULT_BIT_RATE 32000
|
|
#define DEFAULT_BLOCK_ALIGN 4
|
|
#define SAMPLE_RATE 8000
|
|
#define LAYOUT_G726 "g726"
|
|
|
|
/* RtpG726Depay signals and args */
|
|
enum
|
|
{
|
|
/* FILL ME */
|
|
LAST_SIGNAL
|
|
};
|
|
|
|
#define DEFAULT_FORCE_AAL2 TRUE
|
|
|
|
enum
|
|
{
|
|
PROP_0,
|
|
PROP_FORCE_AAL2
|
|
};
|
|
|
|
static GstStaticPadTemplate gst_rtp_g726_depay_sink_template =
|
|
GST_STATIC_PAD_TEMPLATE ("sink",
|
|
GST_PAD_SINK,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS ("application/x-rtp, "
|
|
"media = (string) \"audio\", "
|
|
"encoding-name = (string) { \"G726\", \"G726-16\", \"G726-24\", \"G726-32\", \"G726-40\", "
|
|
"\"AAL2-G726-16\", \"AAL2-G726-24\", \"AAL2-G726-32\", \"AAL2-G726-40\" }, "
|
|
"clock-rate = (int) 8000;")
|
|
);
|
|
|
|
static GstStaticPadTemplate gst_rtp_g726_depay_src_template =
|
|
GST_STATIC_PAD_TEMPLATE ("src",
|
|
GST_PAD_SRC,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS ("audio/x-adpcm, "
|
|
"channels = (int) 1, "
|
|
"rate = (int) 8000, "
|
|
"bitrate = (int) { 16000, 24000, 32000, 40000 }, "
|
|
"block_align = (int) { 2, 3, 4, 5 }, " "layout = (string) \"g726\"")
|
|
);
|
|
|
|
static void gst_rtp_g726_depay_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec);
|
|
static void gst_rtp_g726_depay_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec);
|
|
|
|
static GstBuffer *gst_rtp_g726_depay_process (GstRTPBaseDepayload * depayload,
|
|
GstRTPBuffer * rtp);
|
|
static gboolean gst_rtp_g726_depay_setcaps (GstRTPBaseDepayload * depayload,
|
|
GstCaps * caps);
|
|
|
|
#define gst_rtp_g726_depay_parent_class parent_class
|
|
G_DEFINE_TYPE (GstRtpG726Depay, gst_rtp_g726_depay,
|
|
GST_TYPE_RTP_BASE_DEPAYLOAD);
|
|
|
|
static void
|
|
gst_rtp_g726_depay_class_init (GstRtpG726DepayClass * klass)
|
|
{
|
|
GObjectClass *gobject_class;
|
|
GstElementClass *gstelement_class;
|
|
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
|
|
|
|
GST_DEBUG_CATEGORY_INIT (rtpg726depay_debug, "rtpg726depay", 0,
|
|
"G.726 RTP Depayloader");
|
|
|
|
gobject_class = (GObjectClass *) klass;
|
|
gstelement_class = (GstElementClass *) klass;
|
|
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
|
|
|
|
gobject_class->set_property = gst_rtp_g726_depay_set_property;
|
|
gobject_class->get_property = gst_rtp_g726_depay_get_property;
|
|
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FORCE_AAL2,
|
|
g_param_spec_boolean ("force-aal2", "Force AAL2",
|
|
"Force AAL2 decoding for compatibility with bad payloaders",
|
|
DEFAULT_FORCE_AAL2, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
gst_element_class_add_pad_template (gstelement_class,
|
|
gst_static_pad_template_get (&gst_rtp_g726_depay_src_template));
|
|
gst_element_class_add_pad_template (gstelement_class,
|
|
gst_static_pad_template_get (&gst_rtp_g726_depay_sink_template));
|
|
|
|
gst_element_class_set_static_metadata (gstelement_class,
|
|
"RTP G.726 depayloader", "Codec/Depayloader/Network/RTP",
|
|
"Extracts G.726 audio from RTP packets",
|
|
"Axis Communications <dev-gstreamer@axis.com>");
|
|
|
|
gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_g726_depay_process;
|
|
gstrtpbasedepayload_class->set_caps = gst_rtp_g726_depay_setcaps;
|
|
}
|
|
|
|
static void
|
|
gst_rtp_g726_depay_init (GstRtpG726Depay * rtpG726depay)
|
|
{
|
|
GstRTPBaseDepayload *depayload;
|
|
|
|
depayload = GST_RTP_BASE_DEPAYLOAD (rtpG726depay);
|
|
|
|
gst_pad_use_fixed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload));
|
|
|
|
rtpG726depay->force_aal2 = DEFAULT_FORCE_AAL2;
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_g726_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
|
|
{
|
|
GstCaps *srccaps;
|
|
GstStructure *structure;
|
|
gboolean ret;
|
|
gint clock_rate;
|
|
const gchar *encoding_name;
|
|
GstRtpG726Depay *depay;
|
|
|
|
depay = GST_RTP_G726_DEPAY (depayload);
|
|
|
|
structure = gst_caps_get_structure (caps, 0);
|
|
|
|
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
|
|
clock_rate = 8000; /* default */
|
|
depayload->clock_rate = clock_rate;
|
|
|
|
depay->aal2 = FALSE;
|
|
encoding_name = gst_structure_get_string (structure, "encoding-name");
|
|
if (encoding_name == NULL || g_ascii_strcasecmp (encoding_name, "G726") == 0) {
|
|
depay->bitrate = DEFAULT_BIT_RATE;
|
|
depay->block_align = DEFAULT_BLOCK_ALIGN;
|
|
} else {
|
|
if (g_str_has_prefix (encoding_name, "AAL2-")) {
|
|
depay->aal2 = TRUE;
|
|
encoding_name += 5;
|
|
}
|
|
if (g_ascii_strcasecmp (encoding_name, "G726-16") == 0) {
|
|
depay->bitrate = 16000;
|
|
depay->block_align = 2;
|
|
} else if (g_ascii_strcasecmp (encoding_name, "G726-24") == 0) {
|
|
depay->bitrate = 24000;
|
|
depay->block_align = 3;
|
|
} else if (g_ascii_strcasecmp (encoding_name, "G726-32") == 0) {
|
|
depay->bitrate = 32000;
|
|
depay->block_align = 4;
|
|
} else if (g_ascii_strcasecmp (encoding_name, "G726-40") == 0) {
|
|
depay->bitrate = 40000;
|
|
depay->block_align = 5;
|
|
} else
|
|
goto unknown_encoding;
|
|
}
|
|
|
|
GST_DEBUG ("RTP G.726 depayloader, bitrate set to %d\n", depay->bitrate);
|
|
|
|
srccaps = gst_caps_new_simple ("audio/x-adpcm",
|
|
"channels", G_TYPE_INT, 1,
|
|
"rate", G_TYPE_INT, clock_rate,
|
|
"bitrate", G_TYPE_INT, depay->bitrate,
|
|
"block_align", G_TYPE_INT, depay->block_align,
|
|
"layout", G_TYPE_STRING, LAYOUT_G726, NULL);
|
|
|
|
ret = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
|
|
gst_caps_unref (srccaps);
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
unknown_encoding:
|
|
{
|
|
GST_WARNING ("Could not determine bitrate from encoding-name (%s)",
|
|
encoding_name);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
static GstBuffer *
|
|
gst_rtp_g726_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
|
|
{
|
|
GstRtpG726Depay *depay;
|
|
GstBuffer *outbuf = NULL;
|
|
gboolean marker;
|
|
|
|
depay = GST_RTP_G726_DEPAY (depayload);
|
|
|
|
marker = gst_rtp_buffer_get_marker (rtp);
|
|
|
|
GST_DEBUG ("process : got %" G_GSIZE_FORMAT " bytes, mark %d ts %u seqn %d",
|
|
gst_buffer_get_size (rtp->buffer), marker,
|
|
gst_rtp_buffer_get_timestamp (rtp), gst_rtp_buffer_get_seq (rtp));
|
|
|
|
if (depay->aal2 || depay->force_aal2) {
|
|
/* AAL2, we can just copy the bytes */
|
|
outbuf = gst_rtp_buffer_get_payload_buffer (rtp);
|
|
if (!outbuf)
|
|
goto bad_len;
|
|
} else {
|
|
guint8 *in, *out, tmp;
|
|
guint len;
|
|
GstMapInfo map;
|
|
|
|
in = gst_rtp_buffer_get_payload (rtp);
|
|
len = gst_rtp_buffer_get_payload_len (rtp);
|
|
|
|
outbuf = gst_rtp_buffer_get_payload_buffer (rtp);
|
|
if (!outbuf)
|
|
goto bad_len;
|
|
outbuf = gst_buffer_make_writable (outbuf);
|
|
|
|
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
|
|
out = map.data;
|
|
|
|
/* we need to reshuffle the bytes, input is always of the form
|
|
* A B C D ... with the number of bits depending on the bitrate. */
|
|
switch (depay->bitrate) {
|
|
case 16000:
|
|
{
|
|
/* 0
|
|
* 0 1 2 3 4 5 6 7
|
|
* +-+-+-+-+-+-+-+-+-
|
|
* |D D|C C|B B|A A| ...
|
|
* |0 1|0 1|0 1|0 1|
|
|
* +-+-+-+-+-+-+-+-+-
|
|
*/
|
|
while (len > 0) {
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0xc0) >> 6) |
|
|
((tmp & 0x30) >> 2) | ((tmp & 0x0c) << 2) | ((tmp & 0x03) << 6);
|
|
len--;
|
|
}
|
|
break;
|
|
}
|
|
case 24000:
|
|
{
|
|
/* 0 1 2
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|
|
* |C C|B B B|A A A|F|E E E|D D D|C|H H H|G G G|F F| ...
|
|
* |1 2|0 1 2|0 1 2|2|0 1 2|0 1 2|0|0 1 2|0 1 2|0 1|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|
|
*/
|
|
while (len > 2) {
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0xe0) >> 5) |
|
|
((tmp & 0x1c) << 1) | ((tmp & 0x03) << 6);
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0x80) >> 7) |
|
|
((tmp & 0x70) >> 3) | ((tmp & 0x0e) << 4) | ((tmp & 0x01) << 7);
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0xc0) >> 6) |
|
|
((tmp & 0x38) >> 1) | ((tmp & 0x07) << 5);
|
|
len -= 3;
|
|
}
|
|
break;
|
|
}
|
|
case 32000:
|
|
{
|
|
/* 0 1
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|
|
* |B B B B|A A A A|D D D D|C C C C| ...
|
|
* |0 1 2 3|0 1 2 3|0 1 2 3|0 1 2 3|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|
|
*/
|
|
while (len > 0) {
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4);
|
|
len--;
|
|
}
|
|
break;
|
|
}
|
|
case 40000:
|
|
{
|
|
/* 0 1 2 3 4
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|
|
* |B B B|A A A A A|D|C C C C C|B B|E E E E|D D D D|G G|F F F F F|E|H H H H H|G G G|
|
|
* |2 3 4|0 1 2 3 4|4|0 1 2 3 4|0 1|1 2 3 4|0 1 2 3|3 4|0 1 2 3 4|0|0 1 2 3 4|0 1 2|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|
|
*/
|
|
while (len > 4) {
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0xf8) >> 3) | ((tmp & 0x07) << 5);
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0xc0) >> 6) |
|
|
((tmp & 0x3e) << 1) | ((tmp & 0x01) << 7);
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4);
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0x80) >> 7) |
|
|
((tmp & 0x7c) >> 1) | ((tmp & 0x03) << 6);
|
|
tmp = *in++;
|
|
*out++ = ((tmp & 0xe0) >> 5) | ((tmp & 0x1f) << 3);
|
|
len -= 5;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
gst_buffer_unmap (outbuf, &map);
|
|
}
|
|
|
|
if (marker) {
|
|
/* mark start of talkspurt with RESYNC */
|
|
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_RESYNC);
|
|
}
|
|
|
|
return outbuf;
|
|
|
|
bad_len:
|
|
{
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_rtp_g726_depay_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpG726Depay *rtpg726depay;
|
|
|
|
rtpg726depay = GST_RTP_G726_DEPAY (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_FORCE_AAL2:
|
|
rtpg726depay->force_aal2 = g_value_get_boolean (value);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_rtp_g726_depay_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpG726Depay *rtpg726depay;
|
|
|
|
rtpg726depay = GST_RTP_G726_DEPAY (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_FORCE_AAL2:
|
|
g_value_set_boolean (value, rtpg726depay->force_aal2);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
gboolean
|
|
gst_rtp_g726_depay_plugin_init (GstPlugin * plugin)
|
|
{
|
|
return gst_element_register (plugin, "rtpg726depay",
|
|
GST_RANK_SECONDARY, GST_TYPE_RTP_G726_DEPAY);
|
|
}
|