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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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4a28e649c3
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.
394 lines
12 KiB
C
394 lines
12 KiB
C
/* GStreamer
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* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) 2005 Edgard Lima <edgard.lima@gmail.com>
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* Copyright (C) 2005 Zeeshan Ali <zeenix@gmail.com>
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* Copyright (C) 2008 Axis Communications <dev-gstreamer@axis.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <gst/rtp/gstrtpbuffer.h>
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#include <gst/audio/audio.h>
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#include "gstrtpg726depay.h"
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#include "gstrtputils.h"
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GST_DEBUG_CATEGORY_STATIC (rtpg726depay_debug);
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#define GST_CAT_DEFAULT (rtpg726depay_debug)
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#define DEFAULT_BIT_RATE 32000
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#define DEFAULT_BLOCK_ALIGN 4
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#define SAMPLE_RATE 8000
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#define LAYOUT_G726 "g726"
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/* RtpG726Depay signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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#define DEFAULT_FORCE_AAL2 TRUE
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enum
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{
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PROP_0,
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PROP_FORCE_AAL2
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};
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static GstStaticPadTemplate gst_rtp_g726_depay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp, "
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"media = (string) \"audio\", "
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"encoding-name = (string) { \"G726\", \"G726-16\", \"G726-24\", \"G726-32\", \"G726-40\", "
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"\"AAL2-G726-16\", \"AAL2-G726-24\", \"AAL2-G726-32\", \"AAL2-G726-40\" }, "
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"clock-rate = (int) 8000;")
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);
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static GstStaticPadTemplate gst_rtp_g726_depay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-adpcm, "
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"channels = (int) 1, "
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"rate = (int) 8000, "
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"bitrate = (int) { 16000, 24000, 32000, 40000 }, "
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"block_align = (int) { 2, 3, 4, 5 }, " "layout = (string) \"g726\"")
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);
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static void gst_rtp_g726_depay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_rtp_g726_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static GstBuffer *gst_rtp_g726_depay_process (GstRTPBaseDepayload * depayload,
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GstRTPBuffer * rtp);
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static gboolean gst_rtp_g726_depay_setcaps (GstRTPBaseDepayload * depayload,
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GstCaps * caps);
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#define gst_rtp_g726_depay_parent_class parent_class
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G_DEFINE_TYPE (GstRtpG726Depay, gst_rtp_g726_depay,
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GST_TYPE_RTP_BASE_DEPAYLOAD);
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static void
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gst_rtp_g726_depay_class_init (GstRtpG726DepayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
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GST_DEBUG_CATEGORY_INIT (rtpg726depay_debug, "rtpg726depay", 0,
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"G.726 RTP Depayloader");
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
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gobject_class->set_property = gst_rtp_g726_depay_set_property;
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gobject_class->get_property = gst_rtp_g726_depay_get_property;
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FORCE_AAL2,
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g_param_spec_boolean ("force-aal2", "Force AAL2",
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"Force AAL2 decoding for compatibility with bad payloaders",
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DEFAULT_FORCE_AAL2, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rtp_g726_depay_src_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rtp_g726_depay_sink_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP G.726 depayloader", "Codec/Depayloader/Network/RTP",
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"Extracts G.726 audio from RTP packets",
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"Axis Communications <dev-gstreamer@axis.com>");
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gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_g726_depay_process;
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gstrtpbasedepayload_class->set_caps = gst_rtp_g726_depay_setcaps;
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}
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static void
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gst_rtp_g726_depay_init (GstRtpG726Depay * rtpG726depay)
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{
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GstRTPBaseDepayload *depayload;
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depayload = GST_RTP_BASE_DEPAYLOAD (rtpG726depay);
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gst_pad_use_fixed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload));
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rtpG726depay->force_aal2 = DEFAULT_FORCE_AAL2;
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}
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static gboolean
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gst_rtp_g726_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
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{
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GstCaps *srccaps;
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GstStructure *structure;
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gboolean ret;
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gint clock_rate;
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const gchar *encoding_name;
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GstRtpG726Depay *depay;
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depay = GST_RTP_G726_DEPAY (depayload);
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structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
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clock_rate = 8000; /* default */
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depayload->clock_rate = clock_rate;
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depay->aal2 = FALSE;
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encoding_name = gst_structure_get_string (structure, "encoding-name");
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if (encoding_name == NULL || g_ascii_strcasecmp (encoding_name, "G726") == 0) {
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depay->bitrate = DEFAULT_BIT_RATE;
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depay->block_align = DEFAULT_BLOCK_ALIGN;
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} else {
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if (g_str_has_prefix (encoding_name, "AAL2-")) {
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depay->aal2 = TRUE;
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encoding_name += 5;
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}
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if (g_ascii_strcasecmp (encoding_name, "G726-16") == 0) {
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depay->bitrate = 16000;
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depay->block_align = 2;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-24") == 0) {
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depay->bitrate = 24000;
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depay->block_align = 3;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-32") == 0) {
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depay->bitrate = 32000;
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depay->block_align = 4;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-40") == 0) {
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depay->bitrate = 40000;
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depay->block_align = 5;
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} else
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goto unknown_encoding;
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}
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GST_DEBUG ("RTP G.726 depayloader, bitrate set to %d\n", depay->bitrate);
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srccaps = gst_caps_new_simple ("audio/x-adpcm",
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"channels", G_TYPE_INT, 1,
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"rate", G_TYPE_INT, clock_rate,
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"bitrate", G_TYPE_INT, depay->bitrate,
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"block_align", G_TYPE_INT, depay->block_align,
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"layout", G_TYPE_STRING, LAYOUT_G726, NULL);
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ret = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
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gst_caps_unref (srccaps);
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return ret;
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/* ERRORS */
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unknown_encoding:
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{
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GST_WARNING ("Could not determine bitrate from encoding-name (%s)",
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encoding_name);
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return FALSE;
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}
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}
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static GstBuffer *
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gst_rtp_g726_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
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{
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GstRtpG726Depay *depay;
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GstBuffer *outbuf = NULL;
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gboolean marker;
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depay = GST_RTP_G726_DEPAY (depayload);
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marker = gst_rtp_buffer_get_marker (rtp);
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GST_DEBUG ("process : got %" G_GSIZE_FORMAT " bytes, mark %d ts %u seqn %d",
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gst_buffer_get_size (rtp->buffer), marker,
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gst_rtp_buffer_get_timestamp (rtp), gst_rtp_buffer_get_seq (rtp));
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if (depay->aal2 || depay->force_aal2) {
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/* AAL2, we can just copy the bytes */
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outbuf = gst_rtp_buffer_get_payload_buffer (rtp);
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if (!outbuf)
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goto bad_len;
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gst_rtp_drop_non_audio_meta (depay, outbuf);
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} else {
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guint8 *in, *out, tmp;
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guint len;
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GstMapInfo map;
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in = gst_rtp_buffer_get_payload (rtp);
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len = gst_rtp_buffer_get_payload_len (rtp);
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outbuf = gst_rtp_buffer_get_payload_buffer (rtp);
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if (!outbuf)
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goto bad_len;
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outbuf = gst_buffer_make_writable (outbuf);
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gst_rtp_drop_non_audio_meta (depay, outbuf);
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gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
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out = map.data;
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/* we need to reshuffle the bytes, input is always of the form
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* A B C D ... with the number of bits depending on the bitrate. */
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switch (depay->bitrate) {
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case 16000:
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{
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/* 0
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* 0 1 2 3 4 5 6 7
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* +-+-+-+-+-+-+-+-+-
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* |D D|C C|B B|A A| ...
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* |0 1|0 1|0 1|0 1|
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* +-+-+-+-+-+-+-+-+-
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*/
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while (len > 0) {
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tmp = *in++;
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*out++ = ((tmp & 0xc0) >> 6) |
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((tmp & 0x30) >> 2) | ((tmp & 0x0c) << 2) | ((tmp & 0x03) << 6);
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len--;
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}
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break;
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}
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case 24000:
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{
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/* 0 1 2
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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* |C C|B B B|A A A|F|E E E|D D D|C|H H H|G G G|F F| ...
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* |1 2|0 1 2|0 1 2|2|0 1 2|0 1 2|0|0 1 2|0 1 2|0 1|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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*/
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while (len > 2) {
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tmp = *in++;
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*out++ = ((tmp & 0xe0) >> 5) |
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((tmp & 0x1c) << 1) | ((tmp & 0x03) << 6);
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tmp = *in++;
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*out++ = ((tmp & 0x80) >> 7) |
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((tmp & 0x70) >> 3) | ((tmp & 0x0e) << 4) | ((tmp & 0x01) << 7);
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tmp = *in++;
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*out++ = ((tmp & 0xc0) >> 6) |
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((tmp & 0x38) >> 1) | ((tmp & 0x07) << 5);
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len -= 3;
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}
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break;
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}
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case 32000:
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{
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/* 0 1
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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* |B B B B|A A A A|D D D D|C C C C| ...
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* |0 1 2 3|0 1 2 3|0 1 2 3|0 1 2 3|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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*/
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while (len > 0) {
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tmp = *in++;
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*out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4);
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len--;
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}
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break;
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}
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case 40000:
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{
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/* 0 1 2 3 4
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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* |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|
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* |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|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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*/
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while (len > 4) {
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tmp = *in++;
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*out++ = ((tmp & 0xf8) >> 3) | ((tmp & 0x07) << 5);
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tmp = *in++;
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*out++ = ((tmp & 0xc0) >> 6) |
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((tmp & 0x3e) << 1) | ((tmp & 0x01) << 7);
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tmp = *in++;
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*out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4);
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tmp = *in++;
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*out++ = ((tmp & 0x80) >> 7) |
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((tmp & 0x7c) >> 1) | ((tmp & 0x03) << 6);
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tmp = *in++;
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*out++ = ((tmp & 0xe0) >> 5) | ((tmp & 0x1f) << 3);
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len -= 5;
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}
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break;
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}
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}
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gst_buffer_unmap (outbuf, &map);
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}
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if (marker) {
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/* mark start of talkspurt with RESYNC */
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GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_RESYNC);
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}
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return outbuf;
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bad_len:
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{
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return NULL;
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}
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}
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static void
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gst_rtp_g726_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRtpG726Depay *rtpg726depay;
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rtpg726depay = GST_RTP_G726_DEPAY (object);
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switch (prop_id) {
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case PROP_FORCE_AAL2:
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rtpg726depay->force_aal2 = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rtp_g726_depay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstRtpG726Depay *rtpg726depay;
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rtpg726depay = GST_RTP_G726_DEPAY (object);
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switch (prop_id) {
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case PROP_FORCE_AAL2:
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g_value_set_boolean (value, rtpg726depay->force_aal2);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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gboolean
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gst_rtp_g726_depay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtpg726depay",
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GST_RANK_SECONDARY, GST_TYPE_RTP_G726_DEPAY);
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}
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