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gstreamer/gst/rtp/gstrtpg726depay.c
Tim-Philipp Müller 4a28e649c3 rtp: cache meta tag quarks and add more utility functions for metas 
Every g_quark_from_static_string() is a hash table lookup serialised
on the global quark lock in GLib. Let's just look up the two quarks
we need once and cache them locally for future use. While we're at it,
add new utility functions for the two most commonly used tags
(audio + video). Make first argument a gpointer so we don't have to
cast and make the code ugly. These are used for logging purposes
only anyway.
2017-05-24 13:32:10 +01:00

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/* GStreamer
* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2005 Edgard Lima <edgard.lima@gmail.com>
* 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 <gst/audio/audio.h>
#include "gstrtpg726depay.h"
#include "gstrtputils.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_static_pad_template (gstelement_class,
&gst_rtp_g726_depay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&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;
gst_rtp_drop_non_audio_meta (depay, outbuf);
} 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_rtp_drop_non_audio_meta (depay, 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);
}
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