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This patch introduces the AVTP Audio Format (AAF) payloader element from the AVTP plugin. The element inputs audio raw data and outputs AVTP packets (aka AVTPDUs), implementing a typical protocol payloader element from GStreamer. AAF is one of the available formats to transport audio data in an AVTP system. AAF is specified in IEEE 1722-2016 section 7 and provides two encapsulation mode: PCM and AES3. This patch implements PCM encapsulation mode only. The AAF payloader working mechanism consists of building the AAF header, prepending it to the GstBuffer received on the sink pad, and pushing the buffer downstream. Payloader parameters such as stream ID, maximum transit time, time uncertainty, and timestamping mode are passed via element properties. AAF doesn't support all possible sample format and sampling rate values so the sink pad caps template from the payloader is a subset of audio/x-raw. Additionally, this patch implements only "normal" timestamping mode from AAF. "Sparse" mode should be implemented in future. Upcoming patches will introduce other AVTP payloader elements that will have some common code. For that reason, this patch introduces the GstAvtpBasePayload abstract class that implements common payloader functionalities, and the GstAvtpAafPay class that extends the GstAvtpBasePayload class, implementing AAF-specific functionalities. The AAF payloader element is most likely to be used with the AVTP sink element (to be introduced by a later patch) but it could also be used with UDP sink element to implement AVTP over UDP as described in IEEE 1722-2016 Annex J. This element was inspired by RTP payloader elements.
387 lines
12 KiB
C
387 lines
12 KiB
C
/*
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* GStreamer AVTP Plugin
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* Copyright (C) 2019 Intel Corporation
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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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later
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* 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser 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 Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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/**
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* SECTION:element-avtpaafpay
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* @see_also: avtpaafdepay
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*
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* Payload raw audio into AVTPDUs according to IEEE 1722-2016. For detailed
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* information see https://standards.ieee.org/standard/1722-2016.html.
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*
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* <refsect2>
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* <title>Example pipeline</title>
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* |[
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* gst-launch-1.0 audiotestsrc ! audioconvert ! avtpaafpay ! avtpsink
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* ]| This example pipeline will payload raw audio. Refer to the avtpaafdepay
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* example to depayload and play the AVTP stream.
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* </refsect2>
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*/
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#include <avtp.h>
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#include <avtp_aaf.h>
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#include <gst/audio/audio-format.h>
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#include "gstavtpaafpay.h"
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GST_DEBUG_CATEGORY_STATIC (avtpaafpay_debug);
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#define GST_CAT_DEFAULT (avtpaafpay_debug)
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#define DEFAULT_TSTAMP_MODE GST_AVTP_AAF_TSTAMP_MODE_NORMAL
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enum
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{
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PROP_0,
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PROP_TSTAMP_MODE,
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};
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static GstStaticPadTemplate sink_template = 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 ("audio/x-raw, "
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"format = (string) { S16BE, S24BE, S32BE, F32BE }, "
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"rate = (int) { 8000, 16000, 24000, 32000, 44100, 48000, 88200, 96000, 176400, 192000 }, "
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"channels = " GST_AUDIO_CHANNELS_RANGE ", "
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"layout = (string) interleaved")
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);
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#define GST_TYPE_AVTP_AAF_TSTAMP_MODE (gst_avtp_aaf_tstamp_mode_get_type())
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static GType
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gst_avtp_aaf_tstamp_mode_get_type (void)
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{
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static GType tstamp_mode_type = 0;
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static const GEnumValue tstamp_mode_types[] = {
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{GST_AVTP_AAF_TSTAMP_MODE_NORMAL, "Normal timestamping mode", "normal"},
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{GST_AVTP_AAF_TSTAMP_MODE_SPARSE, "Sparse timestamping mode", "sparse"},
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{0, NULL, NULL},
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};
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tstamp_mode_type =
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g_enum_register_static ("GstAvtpAafTstampMode", tstamp_mode_types);
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return tstamp_mode_type;
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}
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#define gst_avtp_aaf_pay_parent_class parent_class
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G_DEFINE_TYPE (GstAvtpAafPay, gst_avtp_aaf_pay, GST_TYPE_AVTP_BASE_PAYLOAD);
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static void gst_avtp_aaf_pay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_avtp_aaf_pay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstStateChangeReturn gst_avtp_aaf_pay_change_state (GstElement * element,
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GstStateChange transition);
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static GstFlowReturn gst_avtp_aaf_pay_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buffer);
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static gboolean gst_avtp_aaf_pay_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static void
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gst_avtp_aaf_pay_class_init (GstAvtpAafPayClass * klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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GstAvtpBasePayloadClass *avtpbasepayload_class =
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GST_AVTP_BASE_PAYLOAD_CLASS (klass);
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object_class->set_property = gst_avtp_aaf_pay_set_property;
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object_class->get_property = gst_avtp_aaf_pay_get_property;
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g_object_class_install_property (object_class, PROP_TSTAMP_MODE,
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g_param_spec_enum ("tstamp-mode", "Timestamping Mode",
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"AAF timestamping mode", GST_TYPE_AVTP_AAF_TSTAMP_MODE,
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DEFAULT_TSTAMP_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
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GST_PARAM_MUTABLE_PAUSED));
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element_class->change_state =
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GST_DEBUG_FUNCPTR (gst_avtp_aaf_pay_change_state);
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gst_element_class_add_static_pad_template (element_class, &sink_template);
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gst_element_class_set_static_metadata (element_class,
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"AVTP Audio Format (AAF) payloader",
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"Codec/Payloader/Network/AVTP",
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"Payload-encode Raw audio into AAF AVTPDU (IEEE 1722)",
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"Andre Guedes <andre.guedes@intel.com>");
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avtpbasepayload_class->chain = GST_DEBUG_FUNCPTR (gst_avtp_aaf_pay_chain);
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avtpbasepayload_class->sink_event =
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GST_DEBUG_FUNCPTR (gst_avtp_aaf_pay_sink_event);
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GST_DEBUG_CATEGORY_INIT (avtpaafpay_debug, "avtpaafpay", 0,
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"AAF AVTP Payloader");
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}
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static void
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gst_avtp_aaf_pay_init (GstAvtpAafPay * avtpaafpay)
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{
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avtpaafpay->tstamp_mode = DEFAULT_TSTAMP_MODE;
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avtpaafpay->header = NULL;
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avtpaafpay->channels = 0;
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avtpaafpay->depth = 0;
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avtpaafpay->rate = 0;
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avtpaafpay->format = 0;
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}
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static void
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gst_avtp_aaf_pay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstAvtpAafPay *avtpaafpay = GST_AVTP_AAF_PAY (object);
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GST_DEBUG_OBJECT (avtpaafpay, "prop_id %u", prop_id);
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switch (prop_id) {
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case PROP_TSTAMP_MODE:
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avtpaafpay->tstamp_mode = g_value_get_enum (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_avtp_aaf_pay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstAvtpAafPay *avtpaafpay = GST_AVTP_AAF_PAY (object);
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GST_DEBUG_OBJECT (avtpaafpay, "prop_id %u", prop_id);
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switch (prop_id) {
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case PROP_TSTAMP_MODE:
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g_value_set_enum (value, avtpaafpay->tstamp_mode);
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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 GstStateChangeReturn
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gst_avtp_aaf_pay_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstAvtpAafPay *avtpaafpay = GST_AVTP_AAF_PAY (element);
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GST_DEBUG_OBJECT (avtpaafpay, "transition %d", transition);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:{
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GstMemory *mem;
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mem = gst_allocator_alloc (NULL, sizeof (struct avtp_stream_pdu), NULL);
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if (!mem) {
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GST_ERROR_OBJECT (avtpaafpay, "Failed to allocate GstMemory");
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return GST_STATE_CHANGE_FAILURE;
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}
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avtpaafpay->header = gst_memory_ref (mem);
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break;
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}
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case GST_STATE_CHANGE_READY_TO_PAUSED:{
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int res;
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GstMapInfo info;
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struct avtp_stream_pdu *pdu;
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GstMemory *mem = avtpaafpay->header;
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GstAvtpBasePayload *avtpbasepayload = GST_AVTP_BASE_PAYLOAD (element);
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if (!gst_memory_map (mem, &info, GST_MAP_WRITE)) {
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GST_ERROR_OBJECT (avtpaafpay, "Failed to map GstMemory");
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return GST_STATE_CHANGE_FAILURE;
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}
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pdu = (struct avtp_stream_pdu *) info.data;
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res = avtp_aaf_pdu_init (pdu);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_MR, 0);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_TV, 1);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_TU, 0);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_STREAM_ID,
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avtpbasepayload->streamid);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_SP, avtpaafpay->tstamp_mode);
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g_assert (res == 0);
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gst_memory_unmap (mem, &info);
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break;
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}
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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GST_ERROR_OBJECT (avtpaafpay, "Parent failed to handle state transition");
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return ret;
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}
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_NULL:
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gst_memory_unref (avtpaafpay->header);
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break;
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default:
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break;
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}
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return ret;
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}
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static GstFlowReturn
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gst_avtp_aaf_pay_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
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{
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int res;
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GstMemory *mem;
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GstMapInfo info;
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gsize data_len;
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GstClockTime ptime;
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struct avtp_stream_pdu *pdu;
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GstAvtpAafPay *avtpaafpay = GST_AVTP_AAF_PAY (parent);
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GstAvtpBasePayload *avtpbasepayload = GST_AVTP_BASE_PAYLOAD (parent);
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ptime = gst_avtp_base_payload_calc_ptime (avtpbasepayload, buffer);
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data_len = gst_buffer_get_size (buffer);
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mem = gst_memory_copy (avtpaafpay->header, 0, -1);
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if (!gst_memory_map (mem, &info, GST_MAP_WRITE)) {
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GST_ELEMENT_ERROR (avtpaafpay, RESOURCE, WRITE, ("Failed to map memory"),
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(NULL));
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gst_buffer_unref (buffer);
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return GST_FLOW_ERROR;
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}
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pdu = (struct avtp_stream_pdu *) info.data;
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_TIMESTAMP, ptime);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_NSR, avtpaafpay->rate);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_FORMAT, avtpaafpay->format);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_BIT_DEPTH, avtpaafpay->depth);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_STREAM_DATA_LEN, data_len);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_CHAN_PER_FRAME,
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avtpaafpay->channels);
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g_assert (res == 0);
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_SEQ_NUM,
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avtpbasepayload->seqnum++);
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g_assert (res == 0);
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gst_memory_unmap (mem, &info);
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gst_buffer_prepend_memory (buffer, mem);
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return gst_pad_push (avtpbasepayload->srcpad, buffer);
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}
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static int
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gst_to_avtp_rate (gint rate)
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{
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switch (rate) {
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case 8000:
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return AVTP_AAF_PCM_NSR_8KHZ;
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case 16000:
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return AVTP_AAF_PCM_NSR_16KHZ;
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case 24000:
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return AVTP_AAF_PCM_NSR_24KHZ;
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case 32000:
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return AVTP_AAF_PCM_NSR_32KHZ;
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case 44100:
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return AVTP_AAF_PCM_NSR_44_1KHZ;
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case 48000:
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return AVTP_AAF_PCM_NSR_48KHZ;
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case 88200:
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return AVTP_AAF_PCM_NSR_88_2KHZ;
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case 96000:
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return AVTP_AAF_PCM_NSR_96KHZ;
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case 176400:
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return AVTP_AAF_PCM_NSR_176_4KHZ;
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case 192000:
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return AVTP_AAF_PCM_NSR_192KHZ;
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default:
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return AVTP_AAF_PCM_NSR_USER;
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}
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}
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static int
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gst_to_avtp_format (GstAudioFormat format)
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{
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switch (format) {
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case GST_AUDIO_FORMAT_S16BE:
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return AVTP_AAF_FORMAT_INT_16BIT;
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case GST_AUDIO_FORMAT_S24BE:
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return AVTP_AAF_FORMAT_INT_24BIT;
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case GST_AUDIO_FORMAT_S32BE:
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return AVTP_AAF_FORMAT_INT_32BIT;
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case GST_AUDIO_FORMAT_F32BE:
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return AVTP_AAF_FORMAT_FLOAT_32BIT;
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default:
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return AVTP_AAF_FORMAT_USER;
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}
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}
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static gboolean
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gst_avtp_aaf_pay_new_caps (GstAvtpAafPay * avtpaafpay, GstCaps * caps)
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{
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GstAudioInfo info;
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gst_audio_info_init (&info);
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if (!gst_audio_info_from_caps (&info, caps)) {
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GST_ERROR_OBJECT (avtpaafpay, "Failed to get info from caps");
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return FALSE;
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}
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avtpaafpay->channels = info.channels;
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avtpaafpay->depth = info.finfo->depth;
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avtpaafpay->rate = gst_to_avtp_rate (info.rate);
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avtpaafpay->format = gst_to_avtp_format (info.finfo->format);
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GST_DEBUG_OBJECT (avtpaafpay, "channels %d, depth %d, rate %d, format %s",
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info.channels, info.finfo->depth, info.rate,
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gst_audio_format_to_string (info.finfo->format));
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return TRUE;
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}
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static gboolean
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gst_avtp_aaf_pay_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstCaps *caps;
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GstAvtpAafPay *avtpaafpay = GST_AVTP_AAF_PAY (parent);
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GST_DEBUG_OBJECT (avtpaafpay, "event %s", GST_EVENT_TYPE_NAME (event));
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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gst_event_parse_caps (event, &caps);
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return gst_avtp_aaf_pay_new_caps (avtpaafpay, caps);
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default:
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return GST_AVTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (pad,
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parent, event);
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}
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}
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gboolean
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gst_avtp_aaf_pay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "avtpaafpay", GST_RANK_NONE,
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GST_TYPE_AVTP_AAF_PAY);
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}
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