gstreamer/subprojects/gst-plugins-bad/ext/avtp/gstavtpcvfpay.c

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/*
* GStreamer AVTP Plugin
* Copyright (C) 2019 Intel Corporation
* Copyright (c) 2021, Fastree3D
* Adrian Fiergolski <Adrian.Fiergolski@fastree3d.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:element-avtpcvfpay
* @see_also: avtpcvfdepay
*
* Payload compressed video (currently, only H.264) into AVTPDUs according
* to IEEE 1722-2016. For detailed information see
* https://standards.ieee.org/standard/1722-2016.html.
*
* <refsect2>
* <title>Example pipeline</title>
* |[
* gst-launch-1.0 videotestsrc ! x264enc ! avtpcvfpay ! avtpsink
* ]| This example pipeline will payload H.264 video. Refer to the avtpcvfdepay
* example to depayload and play the AVTP stream.
* </refsect2>
*/
#include <avtp.h>
#include <avtp_cvf.h>
#include "gstavtpcvfpay.h"
GST_DEBUG_CATEGORY_STATIC (avtpcvfpay_debug);
#define GST_CAT_DEFAULT avtpcvfpay_debug
/* prototypes */
static GstStateChangeReturn gst_avtp_cvf_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_avtp_cvf_pay_new_caps (GstAvtpVfPayBase * avtpvfpaybase,
GstCaps * caps);
static gboolean gst_avtp_cvf_pay_prepare_avtp_packets (GstAvtpVfPayBase *
avtpvfpaybase, GstBuffer * buffer, GPtrArray * avtp_packets);
enum
{
PROP_0,
};
#define AVTP_CVF_H264_HEADER_SIZE (sizeof(struct avtp_stream_pdu) + sizeof(guint32))
#define FU_A_TYPE 28
#define FU_A_HEADER_SIZE (sizeof(guint16))
#define NRI_MASK 0x60
#define NRI_SHIFT 5
#define START_SHIFT 7
#define END_SHIFT 6
#define NAL_TYPE_MASK 0x1f
#define FIRST_NAL_VCL_TYPE 0x01
#define LAST_NAL_VCL_TYPE 0x05
#define NAL_LEN_SIZE_MASK 0x03
/* pad templates */
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264, "
"stream-format = (string) avc, alignment = (string) au")
);
/* class initialization */
#define gst_avtp_cvf_pay_parent_class parent_class
G_DEFINE_TYPE (GstAvtpCvfPay, gst_avtp_cvf_pay, GST_TYPE_AVTP_VF_PAY_BASE);
GST_ELEMENT_REGISTER_DEFINE (avtpcvfpay, "avtpcvfpay", GST_RANK_NONE,
GST_TYPE_AVTP_CVF_PAY);
static void
gst_avtp_cvf_pay_class_init (GstAvtpCvfPayClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GstAvtpVfPayBaseClass *avtpvfpaybase_class =
GST_AVTP_VF_PAY_BASE_CLASS (klass);
gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"AVTP Compressed Video Format (CVF) payloader",
"Codec/Payloader/Network/AVTP",
"Payload-encode compressed video into CVF AVTPDU (IEEE 1722)",
"Ederson de Souza <ederson.desouza@intel.com>");
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_avtp_cvf_change_state);
avtpvfpaybase_class->new_caps = GST_DEBUG_FUNCPTR (gst_avtp_cvf_pay_new_caps);
avtpvfpaybase_class->prepare_avtp_packets =
GST_DEBUG_FUNCPTR (gst_avtp_cvf_pay_prepare_avtp_packets);
GST_DEBUG_CATEGORY_INIT (avtpcvfpay_debug, "avtpcvfpay",
0, "debug category for avtpcvfpay element");
}
static void
gst_avtp_cvf_pay_init (GstAvtpCvfPay * avtpcvfpay)
{
avtpcvfpay->header = NULL;
avtpcvfpay->nal_length_size = 0;
}
static GstStateChangeReturn
gst_avtp_cvf_change_state (GstElement * element, GstStateChange transition)
{
GstAvtpCvfPay *avtpcvfpay = GST_AVTP_CVF_PAY (element);
GstAvtpBasePayload *avtpbasepayload = GST_AVTP_BASE_PAYLOAD (avtpcvfpay);
GstStateChangeReturn ret;
if (transition == GST_STATE_CHANGE_NULL_TO_READY) {
GstMapInfo map;
struct avtp_stream_pdu *pdu;
int res;
avtpcvfpay->header = gst_buffer_new_allocate (NULL,
AVTP_CVF_H264_HEADER_SIZE, NULL);
if (avtpcvfpay->header == NULL) {
GST_ERROR_OBJECT (avtpcvfpay, "Could not allocate buffer");
return GST_STATE_CHANGE_FAILURE;
}
gst_buffer_map (avtpcvfpay->header, &map, GST_MAP_WRITE);
pdu = (struct avtp_stream_pdu *) map.data;
res = avtp_cvf_pdu_init (pdu, AVTP_CVF_FORMAT_SUBTYPE_H264);
g_assert (res == 0);
res =
avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_STREAM_ID,
avtpbasepayload->streamid);
g_assert (res == 0);
gst_buffer_unmap (avtpcvfpay->header, &map);
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE) {
return ret;
}
if (transition == GST_STATE_CHANGE_READY_TO_NULL) {
gst_buffer_unref (avtpcvfpay->header);
}
return ret;
}
static void
gst_avtp_cvf_pay_extract_nals (GstAvtpCvfPay * avtpcvfpay,
GstBuffer * buffer, GPtrArray * nals)
{
/* The buffer may have more than one NAL. They are grouped together, and before
* each NAL there are some bytes that indicate how big is the NAL */
gsize size, offset = 0;
GstMapInfo map;
guint8 *data;
gboolean res;
if (G_UNLIKELY (avtpcvfpay->nal_length_size == 0)) {
GST_ERROR_OBJECT (avtpcvfpay,
"Can't extract NAL units without nal length size. Missing codec_data caps?");
goto end;
}
res = gst_buffer_map (buffer, &map, GST_MAP_READ);
if (!res) {
GST_ERROR_OBJECT (avtpcvfpay, "Could not map buffer");
goto end;
}
size = map.size;
data = map.data;
while (size > avtpcvfpay->nal_length_size) {
gint i;
guint nal_len = 0;
GstBuffer *nal;
/* Gets NAL length */
for (i = 0; i < avtpcvfpay->nal_length_size; i++) {
nal_len = (nal_len << 8) + data[i];
}
if (nal_len == 0) {
GST_WARNING_OBJECT (avtpcvfpay, "Invalid NAL unit size: 0");
break;
}
offset += avtpcvfpay->nal_length_size;
data += avtpcvfpay->nal_length_size;
size -= avtpcvfpay->nal_length_size;
if (G_UNLIKELY (size < nal_len)) {
GST_WARNING_OBJECT (avtpcvfpay,
"Got incomplete NAL: NAL len %u, buffer len %zu", nal_len, size);
nal_len = size;
}
nal = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, offset, nal_len);
GST_BUFFER_PTS (nal) = GST_BUFFER_PTS (buffer);
GST_BUFFER_DTS (nal) = GST_BUFFER_DTS (buffer);
g_ptr_array_add (nals, nal);
offset += nal_len;
data += nal_len;
size -= nal_len;
}
gst_buffer_unmap (buffer, &map);
end:
/* This function consumes the buffer, and all references to it are in the
* extracted nals, so we can release the reference to the buffer itself */
gst_buffer_unref (buffer);
GST_LOG_OBJECT (avtpcvfpay, "Extracted %u NALu's from buffer", nals->len);
}
static gboolean
gst_avtp_cvf_pay_is_nal_vcl (GstAvtpCvfPay * avtpcvfpay, GstBuffer * nal)
{
guint8 nal_header, nal_type;
gst_buffer_extract (nal, 0, &nal_header, 1);
nal_type = nal_header & NAL_TYPE_MASK;
return nal_type >= FIRST_NAL_VCL_TYPE && nal_type <= LAST_NAL_VCL_TYPE;
}
static GstBuffer *
gst_avtpcvpay_fragment_nal (GstAvtpCvfPay * avtpcvfpay, GstBuffer * nal,
gsize * offset, gboolean * last_fragment)
{
GstAvtpVfPayBase *avtpvfpaybase = GST_AVTP_VF_PAY_BASE (avtpcvfpay);
GstBuffer *fragment_header, *fragment;
guint8 nal_header, nal_type, nal_nri, fu_indicator, fu_header;
gsize available, nal_size, fragment_size, remaining;
GstMapInfo map;
nal_size = gst_buffer_get_size (nal);
/* If NAL + header will be smaller than MTU, nothing to fragment */
if (*offset == 0
&& (nal_size + AVTP_CVF_H264_HEADER_SIZE) <= avtpvfpaybase->mtu) {
*last_fragment = TRUE;
*offset = nal_size;
GST_DEBUG_OBJECT (avtpcvfpay,
"Generated fragment with size %" G_GSIZE_FORMAT, nal_size);
return gst_buffer_ref (nal);
}
/* We're done with this buffer */
if (*offset == nal_size) {
return NULL;
}
*last_fragment = FALSE;
/* Remaining size is smaller than MTU, so this is the last fragment */
remaining = nal_size - *offset + AVTP_CVF_H264_HEADER_SIZE + FU_A_HEADER_SIZE;
if (remaining <= avtpvfpaybase->mtu) {
*last_fragment = TRUE;
}
fragment_header = gst_buffer_new_allocate (NULL, FU_A_HEADER_SIZE, NULL);
if (G_UNLIKELY (fragment_header == NULL)) {
GST_ERROR_OBJECT (avtpcvfpay, "Could not allocate memory for buffer");
return NULL;
}
/* NAL header info is spread to all FUs */
gst_buffer_extract (nal, 0, &nal_header, 1);
nal_type = nal_header & NAL_TYPE_MASK;
nal_nri = (nal_header & NRI_MASK) >> NRI_SHIFT;
fu_indicator = (nal_nri << NRI_SHIFT) | FU_A_TYPE;
fu_header = ((*offset == 0) << START_SHIFT) |
((*last_fragment == TRUE) << END_SHIFT) | nal_type;
gst_buffer_map (fragment_header, &map, GST_MAP_WRITE);
map.data[0] = fu_indicator;
map.data[1] = fu_header;
gst_buffer_unmap (fragment_header, &map);
available =
avtpvfpaybase->mtu - AVTP_CVF_H264_HEADER_SIZE -
gst_buffer_get_size (fragment_header);
/* NAL unit header is not sent, but spread into FU indicator and header,
* and reconstructed on depayloader */
if (*offset == 0)
*offset = 1;
fragment_size =
available < (nal_size - *offset) ? available : (nal_size - *offset);
fragment =
gst_buffer_append (fragment_header, gst_buffer_copy_region (nal,
GST_BUFFER_COPY_MEMORY, *offset, fragment_size));
*offset += fragment_size;
GST_DEBUG_OBJECT (avtpcvfpay,
"Generated fragment with size %" G_GSIZE_FORMAT, fragment_size);
return fragment;
}
static gboolean
gst_avtp_cvf_pay_prepare_avtp_packets (GstAvtpVfPayBase * avtpvfpaybase,
GstBuffer * buffer, GPtrArray * avtp_packets)
{
GstAvtpBasePayload *avtpbasepayload = GST_AVTP_BASE_PAYLOAD (avtpvfpaybase);
GstAvtpCvfPay *avtpcvfpay = GST_AVTP_CVF_PAY (avtpvfpaybase);
GPtrArray *nals;
GstBuffer *header, *nal;
GstMapInfo map;
gint i;
/* Get all NALs inside buffer */
nals = g_ptr_array_new ();
gst_avtp_cvf_pay_extract_nals (avtpcvfpay, buffer, nals);
for (i = 0; i < nals->len; i++) {
guint64 avtp_time, h264_time;
gboolean last_fragment;
GstBuffer *fragment;
gsize offset;
nal = g_ptr_array_index (nals, i);
GST_LOG_OBJECT (avtpcvfpay,
"Preparing AVTP packets for NAL whose size is %" G_GSIZE_FORMAT,
gst_buffer_get_size (nal));
/* Calculate timestamps. Note that we do it twice, one using DTS as base,
* the other using PTS - using code inherited from avtpbasepayload.
* Also worth noting: `avtpbasepayload->latency` is updated after
* first call to gst_avtp_base_payload_calc_ptime, so we MUST call
* it before using the latency value */
h264_time = gst_avtp_base_payload_calc_ptime (avtpbasepayload, nal);
avtp_time =
gst_element_get_base_time (GST_ELEMENT (avtpcvfpay)) +
gst_segment_to_running_time (&avtpbasepayload->segment, GST_FORMAT_TIME,
GST_BUFFER_DTS_OR_PTS (nal)) + avtpbasepayload->mtt +
avtpbasepayload->tu + avtpbasepayload->processing_deadline +
avtpbasepayload->latency;
offset = 0;
while ((fragment =
gst_avtpcvpay_fragment_nal (avtpcvfpay, nal, &offset,
&last_fragment))) {
GstBuffer *packet;
struct avtp_stream_pdu *pdu;
gint res;
/* Copy header to reuse common fields and change what is needed */
header = gst_buffer_copy (avtpcvfpay->header);
gst_buffer_map (header, &map, GST_MAP_WRITE);
pdu = (struct avtp_stream_pdu *) map.data;
/* Stream data len includes AVTP H264 header len as this is part of
* the payload too. It's just the uint32_t with the h264 timestamp*/
res =
avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_STREAM_DATA_LEN,
gst_buffer_get_size (fragment) + sizeof (uint32_t));
g_assert (res == 0);
res =
avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_SEQ_NUM,
avtpbasepayload->seqnum++);
g_assert (res == 0);
/* Although AVTP_TIMESTAMP is only set on the very last fragment, IEEE 1722
* doesn't mention such need for H264_TIMESTAMP. So, we set it for all
* fragments */
res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_H264_TIMESTAMP, h264_time);
g_assert (res == 0);
res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_H264_PTV, 1);
g_assert (res == 0);
/* Only last fragment should have M, AVTP_TS and TV fields set */
if (last_fragment) {
gboolean M;
res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_TV, 1);
g_assert (res == 0);
res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_TIMESTAMP, avtp_time);
g_assert (res == 0);
/* Set M only if last NAL and it is a VCL NAL */
M = (i == nals->len - 1)
&& gst_avtp_cvf_pay_is_nal_vcl (avtpcvfpay, nal);
res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_M, M);
g_assert (res == 0);
if (M) {
GST_LOG_OBJECT (avtpcvfpay, "M packet sent, PTS: %" GST_TIME_FORMAT
" DTS: %" GST_TIME_FORMAT " AVTP_TS: %" GST_TIME_FORMAT
" H264_TS: %" GST_TIME_FORMAT "\navtp_time: %" G_GUINT64_FORMAT
" h264_time: %" G_GUINT64_FORMAT, GST_TIME_ARGS (h264_time),
GST_TIME_ARGS (avtp_time), GST_TIME_ARGS (avtp_time & 0xffffffff),
GST_TIME_ARGS (h264_time & 0xffffffff), avtp_time, h264_time);
}
}
packet = gst_buffer_append (header, fragment);
/* Keep original timestamps */
GST_BUFFER_PTS (packet) = GST_BUFFER_PTS (nal);
GST_BUFFER_DTS (packet) = GST_BUFFER_DTS (nal);
g_ptr_array_add (avtp_packets, packet);
gst_buffer_unmap (header, &map);
}
gst_buffer_unref (nal);
}
g_ptr_array_free (nals, TRUE);
GST_LOG_OBJECT (avtpcvfpay, "Prepared %u AVTP packets", avtp_packets->len);
return TRUE;
}
static gboolean
gst_avtp_cvf_pay_new_caps (GstAvtpVfPayBase * avtpvfpaybase, GstCaps * caps)
{
GstAvtpCvfPay *avtpcvfpay = GST_AVTP_CVF_PAY (avtpvfpaybase);
const GValue *value;
GstStructure *str;
GstBuffer *buffer;
GstMapInfo map;
str = gst_caps_get_structure (caps, 0);
if ((value = gst_structure_get_value (str, "codec_data"))) {
guint8 *data;
gsize size;
buffer = gst_value_get_buffer (value);
gst_buffer_map (buffer, &map, GST_MAP_READ);
data = map.data;
size = map.size;
if (G_UNLIKELY (size < 7)) {
GST_ERROR_OBJECT (avtpcvfpay, "avcC size %" G_GSIZE_FORMAT " < 7", size);
goto error;
}
if (G_UNLIKELY (data[0] != 1)) {
GST_ERROR_OBJECT (avtpcvfpay, "avcC version %u != 1", data[0]);
goto error;
}
/* Number of bytes in front of NAL units marking their size */
avtpcvfpay->nal_length_size = (data[4] & NAL_LEN_SIZE_MASK) + 1;
GST_DEBUG_OBJECT (avtpcvfpay, "Got NAL length from caps: %u",
avtpcvfpay->nal_length_size);
gst_buffer_unmap (buffer, &map);
}
return TRUE;
error:
gst_buffer_unmap (buffer, &map);
return FALSE;
}