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gstreamer/gst/rtp/gstrtph263ppay.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) <2005> Wim Taymans <wim.taymans@gmail.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 <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/video/video.h>
#include "gstrtph263ppay.h"
#include "gstrtputils.h"
#define DEFAULT_FRAGMENTATION_MODE GST_FRAGMENTATION_MODE_NORMAL
enum
{
PROP_0,
PROP_FRAGMENTATION_MODE
};
#define GST_TYPE_FRAGMENTATION_MODE (gst_fragmentation_mode_get_type())
static GType
gst_fragmentation_mode_get_type (void)
{
static GType fragmentation_mode_type = 0;
static const GEnumValue fragmentation_mode[] = {
{GST_FRAGMENTATION_MODE_NORMAL, "Normal", "normal"},
{GST_FRAGMENTATION_MODE_SYNC, "Fragment at sync points", "sync"},
{0, NULL, NULL},
};
if (!fragmentation_mode_type) {
fragmentation_mode_type =
g_enum_register_static ("GstFragmentationMode", fragmentation_mode);
}
return fragmentation_mode_type;
}
GST_DEBUG_CATEGORY_STATIC (rtph263ppay_debug);
#define GST_CAT_DEFAULT rtph263ppay_debug
static GstStaticPadTemplate gst_rtp_h263p_pay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h263, variant = (string) itu")
);
/*
* We also return these in getcaps() as required by the SDP caps
*
* width = (int) [16, 4096]
* height = (int) [16, 4096]
* "annex-f = (boolean) {true, false},"
* "annex-i = (boolean) {true, false},"
* "annex-j = (boolean) {true, false},"
* "annex-l = (boolean) {true, false},"
* "annex-t = (boolean) {true, false},"
* "annex-v = (boolean) {true, false}")
*/
static GstStaticPadTemplate gst_rtp_h263p_pay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"video\", "
"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
"clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"; "
"application/x-rtp, "
"media = (string) \"video\", "
"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
"clock-rate = (int) 90000, " "encoding-name = (string) \"H263-2000\"")
);
static void gst_rtp_h263p_pay_finalize (GObject * object);
static void gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_rtp_h263p_pay_setcaps (GstRTPBasePayload * payload,
GstCaps * caps);
static GstCaps *gst_rtp_h263p_pay_sink_getcaps (GstRTPBasePayload * payload,
GstPad * pad, GstCaps * filter);
static GstFlowReturn gst_rtp_h263p_pay_handle_buffer (GstRTPBasePayload *
payload, GstBuffer * buffer);
#define gst_rtp_h263p_pay_parent_class parent_class
G_DEFINE_TYPE (GstRtpH263PPay, gst_rtp_h263p_pay, GST_TYPE_RTP_BASE_PAYLOAD);
static void
gst_rtp_h263p_pay_class_init (GstRtpH263PPayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBasePayloadClass *gstrtpbasepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;
gobject_class->finalize = gst_rtp_h263p_pay_finalize;
gobject_class->set_property = gst_rtp_h263p_pay_set_property;
gobject_class->get_property = gst_rtp_h263p_pay_get_property;
gstrtpbasepayload_class->set_caps = gst_rtp_h263p_pay_setcaps;
gstrtpbasepayload_class->get_caps = gst_rtp_h263p_pay_sink_getcaps;
gstrtpbasepayload_class->handle_buffer = gst_rtp_h263p_pay_handle_buffer;
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_FRAGMENTATION_MODE, g_param_spec_enum ("fragmentation-mode",
"Fragmentation Mode",
"Packet Fragmentation Mode", GST_TYPE_FRAGMENTATION_MODE,
DEFAULT_FRAGMENTATION_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_h263p_pay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_h263p_pay_sink_template);
gst_element_class_set_static_metadata (gstelement_class, "RTP H263 payloader",
"Codec/Payloader/Network/RTP",
"Payload-encodes H263/+/++ video in RTP packets (RFC 4629)",
"Wim Taymans <wim.taymans@gmail.com>");
GST_DEBUG_CATEGORY_INIT (rtph263ppay_debug, "rtph263ppay",
0, "rtph263ppay (RFC 4629)");
}
static void
gst_rtp_h263p_pay_init (GstRtpH263PPay * rtph263ppay)
{
rtph263ppay->adapter = gst_adapter_new ();
rtph263ppay->fragmentation_mode = DEFAULT_FRAGMENTATION_MODE;
}
static void
gst_rtp_h263p_pay_finalize (GObject * object)
{
GstRtpH263PPay *rtph263ppay;
rtph263ppay = GST_RTP_H263P_PAY (object);
g_object_unref (rtph263ppay->adapter);
rtph263ppay->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_rtp_h263p_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
{
gboolean res;
GstCaps *peercaps;
gchar *encoding_name = NULL;
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
peercaps =
gst_pad_peer_query_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload), NULL);
if (peercaps) {
GstCaps *tcaps =
gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload));
GstCaps *intersect = gst_caps_intersect (peercaps, tcaps);
gst_caps_unref (tcaps);
gst_caps_unref (peercaps);
if (!gst_caps_is_empty (intersect)) {
GstStructure *s = gst_caps_get_structure (intersect, 0);
encoding_name = g_strdup (gst_structure_get_string (s, "encoding-name"));
}
gst_caps_unref (intersect);
}
if (!encoding_name)
encoding_name = g_strdup ("H263-1998");
gst_rtp_base_payload_set_options (payload, "video", TRUE,
(gchar *) encoding_name, 90000);
res = gst_rtp_base_payload_set_outcaps (payload, NULL);
g_free (encoding_name);
return res;
}
static GstCaps *
caps_append (GstCaps * caps, GstStructure * in_s, guint x, guint y, guint mpi)
{
GstStructure *s;
if (!in_s)
return caps;
if (mpi < 1 || mpi > 32)
return caps;
s = gst_structure_copy (in_s);
gst_structure_set (s,
"width", GST_TYPE_INT_RANGE, 1, x,
"height", GST_TYPE_INT_RANGE, 1, y,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 1001 * mpi, NULL);
caps = gst_caps_merge_structure (caps, s);
return caps;
}
static GstCaps *
gst_rtp_h263p_pay_sink_getcaps (GstRTPBasePayload * payload, GstPad * pad,
GstCaps * filter)
{
GstRtpH263PPay *rtph263ppay;
GstCaps *caps = NULL, *templ;
GstCaps *peercaps = NULL;
GstCaps *intersect = NULL;
guint i;
rtph263ppay = GST_RTP_H263P_PAY (payload);
peercaps =
gst_pad_peer_query_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload), NULL);
/* if we're just outputting to udpsink or fakesink or so, we should also
* accept any input compatible with our sink template caps */
if (!peercaps || gst_caps_is_any (peercaps)) {
if (peercaps)
gst_caps_unref (peercaps);
caps =
gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SINKPAD (payload));
goto done;
}
/* We basically need to differentiate two use-cases here: One where there's
* a capsfilter after the payloader with caps created from an SDP; in this
* case the filter caps are fixed and we want to signal to an encoder what
* we want it to produce. The second case is simply payloader ! depayloader
* where we are dealing with the depayloader's template caps. In this case
* we should accept any input compatible with our sink template caps. */
if (!gst_caps_is_fixed (peercaps)) {
gst_caps_unref (peercaps);
caps =
gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SINKPAD (payload));
goto done;
}
templ = gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload));
intersect = gst_caps_intersect (peercaps, templ);
gst_caps_unref (peercaps);
gst_caps_unref (templ);
if (gst_caps_is_empty (intersect))
return intersect;
caps = gst_caps_new_empty ();
for (i = 0; i < gst_caps_get_size (intersect); i++) {
GstStructure *s = gst_caps_get_structure (intersect, i);
const gchar *encoding_name = gst_structure_get_string (s, "encoding-name");
if (!strcmp (encoding_name, "H263-2000")) {
const gchar *profile_str = gst_structure_get_string (s, "profile");
const gchar *level_str = gst_structure_get_string (s, "level");
int profile = 0;
int level = 0;
if (profile_str && level_str) {
gboolean i = FALSE, j = FALSE, l = FALSE, t = FALSE, f = FALSE,
v = FALSE;
GstStructure *new_s = gst_structure_new ("video/x-h263",
"variant", G_TYPE_STRING, "itu",
NULL);
profile = atoi (profile_str);
level = atoi (level_str);
/* These profiles are defined in the H.263 Annex X */
switch (profile) {
case 0:
/* The Baseline Profile (Profile 0) */
break;
case 1:
/* H.320 Coding Efficiency Version 2 Backward-Compatibility Profile
* (Profile 1)
* Baseline + Annexes I, J, L.4 and T
*/
i = j = l = t = TRUE;
break;
case 2:
/* Version 1 Backward-Compatibility Profile (Profile 2)
* Baseline + Annex F
*/
i = j = l = t = f = TRUE;
break;
case 3:
/* Version 2 Interactive and Streaming Wireless Profile
* Baseline + Annexes I, J, T
*/
i = j = t = TRUE;
break;
case 4:
/* Version 3 Interactive and Streaming Wireless Profile (Profile 4)
* Baseline + Annexes I, J, T, V, W.6.3.8,
*/
/* Missing W.6.3.8 */
i = j = t = v = TRUE;
break;
case 5:
/* Conversational High Compression Profile (Profile 5)
* Baseline + Annexes F, I, J, L.4, T, D, U
*/
/* Missing D, U */
f = i = j = l = t = TRUE;
break;
case 6:
/* Conversational Internet Profile (Profile 6)
* Baseline + Annexes F, I, J, L.4, T, D, U and
* K with arbitratry slice ordering
*/
/* Missing D, U, K with arbitratry slice ordering */
f = i = j = l = t = TRUE;
break;
case 7:
/* Conversational Interlace Profile (Profile 7)
* Baseline + Annexes F, I, J, L.4, T, D, U, W.6.3.11
*/
/* Missing D, U, W.6.3.11 */
f = i = j = l = t = TRUE;
break;
case 8:
/* High Latency Profile (Profile 8)
* Baseline + Annexes F, I, J, L.4, T, D, U, P.5, O.1.1 and
* K with arbitratry slice ordering
*/
/* Missing D, U, P.5, O.1.1 */
f = i = j = l = t = TRUE;
break;
}
if (f || i || j || t || l || v) {
GValue list = { 0 };
GValue vstr = { 0 };
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&vstr, G_TYPE_STRING);
g_value_set_static_string (&vstr, "h263");
gst_value_list_append_value (&list, &vstr);
g_value_set_static_string (&vstr, "h263p");
gst_value_list_append_value (&list, &vstr);
if (l || v) {
g_value_set_static_string (&vstr, "h263pp");
gst_value_list_append_value (&list, &vstr);
}
g_value_unset (&vstr);
gst_structure_set_value (new_s, "h263version", &list);
g_value_unset (&list);
} else {
gst_structure_set (new_s, "h263version", G_TYPE_STRING, "h263", NULL);
}
if (!f)
gst_structure_set (new_s, "annex-f", G_TYPE_BOOLEAN, FALSE, NULL);
if (!i)
gst_structure_set (new_s, "annex-i", G_TYPE_BOOLEAN, FALSE, NULL);
if (!j)
gst_structure_set (new_s, "annex-j", G_TYPE_BOOLEAN, FALSE, NULL);
if (!t)
gst_structure_set (new_s, "annex-t", G_TYPE_BOOLEAN, FALSE, NULL);
if (!l)
gst_structure_set (new_s, "annex-l", G_TYPE_BOOLEAN, FALSE, NULL);
if (!v)
gst_structure_set (new_s, "annex-v", G_TYPE_BOOLEAN, FALSE, NULL);
if (level <= 10 || level == 45) {
gst_structure_set (new_s,
"width", GST_TYPE_INT_RANGE, 1, 176,
"height", GST_TYPE_INT_RANGE, 1, 144,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 2002, NULL);
caps = gst_caps_merge_structure (caps, new_s);
} else if (level <= 20) {
GstStructure *s_copy = gst_structure_copy (new_s);
gst_structure_set (new_s,
"width", GST_TYPE_INT_RANGE, 1, 352,
"height", GST_TYPE_INT_RANGE, 1, 288,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 2002, NULL);
caps = gst_caps_merge_structure (caps, new_s);
gst_structure_set (s_copy,
"width", GST_TYPE_INT_RANGE, 1, 176,
"height", GST_TYPE_INT_RANGE, 1, 144,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 1001, NULL);
caps = gst_caps_merge_structure (caps, s_copy);
} else if (level <= 40) {
gst_structure_set (new_s,
"width", GST_TYPE_INT_RANGE, 1, 352,
"height", GST_TYPE_INT_RANGE, 1, 288,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 1001, NULL);
caps = gst_caps_merge_structure (caps, new_s);
} else if (level <= 50) {
GstStructure *s_copy = gst_structure_copy (new_s);
gst_structure_set (new_s,
"width", GST_TYPE_INT_RANGE, 1, 352,
"height", GST_TYPE_INT_RANGE, 1, 288,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 50, 1, NULL);
caps = gst_caps_merge_structure (caps, new_s);
gst_structure_set (s_copy,
"width", GST_TYPE_INT_RANGE, 1, 352,
"height", GST_TYPE_INT_RANGE, 1, 240,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 60000, 1001, NULL);
caps = gst_caps_merge_structure (caps, s_copy);
} else if (level <= 60) {
GstStructure *s_copy = gst_structure_copy (new_s);
gst_structure_set (new_s,
"width", GST_TYPE_INT_RANGE, 1, 720,
"height", GST_TYPE_INT_RANGE, 1, 288,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 50, 1, NULL);
caps = gst_caps_merge_structure (caps, new_s);
gst_structure_set (s_copy,
"width", GST_TYPE_INT_RANGE, 1, 720,
"height", GST_TYPE_INT_RANGE, 1, 240,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 60000, 1001, NULL);
caps = gst_caps_merge_structure (caps, s_copy);
} else if (level <= 70) {
GstStructure *s_copy = gst_structure_copy (new_s);
gst_structure_set (new_s,
"width", GST_TYPE_INT_RANGE, 1, 720,
"height", GST_TYPE_INT_RANGE, 1, 576,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 50, 1, NULL);
caps = gst_caps_merge_structure (caps, new_s);
gst_structure_set (s_copy,
"width", GST_TYPE_INT_RANGE, 1, 720,
"height", GST_TYPE_INT_RANGE, 1, 480,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 60000, 1001, NULL);
caps = gst_caps_merge_structure (caps, s_copy);
} else {
caps = gst_caps_merge_structure (caps, new_s);
}
} else {
GstStructure *new_s = gst_structure_new ("video/x-h263",
"variant", G_TYPE_STRING, "itu",
"h263version", G_TYPE_STRING, "h263",
NULL);
GST_DEBUG_OBJECT (rtph263ppay, "No profile or level specified"
" for H263-2000, defaulting to baseline H263");
caps = gst_caps_merge_structure (caps, new_s);
}
} else {
gboolean f = FALSE, i = FALSE, j = FALSE, t = FALSE;
/* FIXME: ffmpeg support the Appendix K too, how do we express it ?
* guint k;
*/
const gchar *str;
GstStructure *new_s = gst_structure_new ("video/x-h263",
"variant", G_TYPE_STRING, "itu",
NULL);
gboolean added = FALSE;
str = gst_structure_get_string (s, "f");
if (str && !strcmp (str, "1"))
f = TRUE;
str = gst_structure_get_string (s, "i");
if (str && !strcmp (str, "1"))
i = TRUE;
str = gst_structure_get_string (s, "j");
if (str && !strcmp (str, "1"))
j = TRUE;
str = gst_structure_get_string (s, "t");
if (str && !strcmp (str, "1"))
t = TRUE;
if (f || i || j || t) {
GValue list = { 0 };
GValue vstr = { 0 };
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&vstr, G_TYPE_STRING);
g_value_set_static_string (&vstr, "h263");
gst_value_list_append_value (&list, &vstr);
g_value_set_static_string (&vstr, "h263p");
gst_value_list_append_value (&list, &vstr);
g_value_unset (&vstr);
gst_structure_set_value (new_s, "h263version", &list);
g_value_unset (&list);
} else {
gst_structure_set (new_s, "h263version", G_TYPE_STRING, "h263", NULL);
}
if (!f)
gst_structure_set (new_s, "annex-f", G_TYPE_BOOLEAN, FALSE, NULL);
if (!i)
gst_structure_set (new_s, "annex-i", G_TYPE_BOOLEAN, FALSE, NULL);
if (!j)
gst_structure_set (new_s, "annex-j", G_TYPE_BOOLEAN, FALSE, NULL);
if (!t)
gst_structure_set (new_s, "annex-t", G_TYPE_BOOLEAN, FALSE, NULL);
str = gst_structure_get_string (s, "custom");
if (str) {
unsigned int xmax, ymax, mpi;
if (sscanf (str, "%u,%u,%u", &xmax, &ymax, &mpi) == 3) {
if (xmax % 4 && ymax % 4 && mpi >= 1 && mpi <= 32) {
caps = caps_append (caps, new_s, xmax, ymax, mpi);
added = TRUE;
} else {
GST_WARNING_OBJECT (rtph263ppay, "Invalid custom framesize/MPI"
" %u x %u at %u, ignoring", xmax, ymax, mpi);
}
} else {
GST_WARNING_OBJECT (rtph263ppay, "Invalid custom framesize/MPI: %s,"
" ignoring", str);
}
}
str = gst_structure_get_string (s, "16cif");
if (str) {
int mpi = atoi (str);
caps = caps_append (caps, new_s, 1408, 1152, mpi);
added = TRUE;
}
str = gst_structure_get_string (s, "4cif");
if (str) {
int mpi = atoi (str);
caps = caps_append (caps, new_s, 704, 576, mpi);
added = TRUE;
}
str = gst_structure_get_string (s, "cif");
if (str) {
int mpi = atoi (str);
caps = caps_append (caps, new_s, 352, 288, mpi);
added = TRUE;
}
str = gst_structure_get_string (s, "qcif");
if (str) {
int mpi = atoi (str);
caps = caps_append (caps, new_s, 176, 144, mpi);
added = TRUE;
}
str = gst_structure_get_string (s, "sqcif");
if (str) {
int mpi = atoi (str);
caps = caps_append (caps, new_s, 128, 96, mpi);
added = TRUE;
}
if (added)
gst_structure_free (new_s);
else
caps = gst_caps_merge_structure (caps, new_s);
}
}
gst_caps_unref (intersect);
done:
if (filter) {
GstCaps *tmp;
GST_DEBUG_OBJECT (payload, "Intersect %" GST_PTR_FORMAT " and filter %"
GST_PTR_FORMAT, caps, filter);
tmp = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = tmp;
}
return caps;
}
static void
gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpH263PPay *rtph263ppay;
rtph263ppay = GST_RTP_H263P_PAY (object);
switch (prop_id) {
case PROP_FRAGMENTATION_MODE:
rtph263ppay->fragmentation_mode = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRtpH263PPay *rtph263ppay;
rtph263ppay = GST_RTP_H263P_PAY (object);
switch (prop_id) {
case PROP_FRAGMENTATION_MODE:
g_value_set_enum (value, rtph263ppay->fragmentation_mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_rtp_h263p_pay_flush (GstRtpH263PPay * rtph263ppay)
{
guint avail;
GstBufferList *list = NULL;
GstBuffer *outbuf = NULL;
GstFlowReturn ret;
gboolean fragmented = FALSE;
avail = gst_adapter_available (rtph263ppay->adapter);
if (avail == 0)
return GST_FLOW_OK;
fragmented = FALSE;
/* This algorithm assumes the H263/+/++ encoder sends complete frames in each
* buffer */
/* With Fragmentation Mode at GST_FRAGMENTATION_MODE_NORMAL:
* This algorithm implements the Follow-on packets method for packetization.
* This assumes low packet loss network.
* With Fragmentation Mode at GST_FRAGMENTATION_MODE_SYNC:
* This algorithm separates large frames at synchronisation points (Segments)
* (See RFC 4629 section 6). It would be interesting to have a property such as network
* quality to select between both packetization methods */
/* TODO Add VRC supprt (See RFC 4629 section 5.2) */
while (avail > 0) {
guint towrite;
guint8 *payload;
gint header_len;
guint next_gop = 0;
gboolean found_gob = FALSE;
GstRTPBuffer rtp = { NULL };
GstBuffer *payload_buf;
if (rtph263ppay->fragmentation_mode == GST_FRAGMENTATION_MODE_SYNC) {
/* start after 1st gop possible */
/* Check if we have a gob or eos , eossbs */
/* FIXME EOS and EOSSBS packets should never contain any gobs and vice-versa */
next_gop =
gst_adapter_masked_scan_uint32 (rtph263ppay->adapter, 0xffff8000,
0x00008000, 0, avail);
if (next_gop == 0) {
GST_DEBUG_OBJECT (rtph263ppay, " Found GOB header");
found_gob = TRUE;
}
/* Find next and cut the packet accordingly */
/* TODO we should get as many gobs as possible until MTU is reached, this
* code seems to just get one GOB per packet */
if (next_gop == 0 && avail > 3)
next_gop =
gst_adapter_masked_scan_uint32 (rtph263ppay->adapter, 0xffff8000,
0x00008000, 3, avail - 3);
GST_DEBUG_OBJECT (rtph263ppay, " Next GOB Detected at : %d", next_gop);
if (next_gop == -1)
next_gop = 0;
}
/* for picture start frames (non-fragmented), we need to remove the first
* two 0x00 bytes and set P=1 */
if (!fragmented || found_gob) {
gst_adapter_flush (rtph263ppay->adapter, 2);
avail -= 2;
}
header_len = 2;
towrite = MIN (avail, gst_rtp_buffer_calc_payload_len
(GST_RTP_BASE_PAYLOAD_MTU (rtph263ppay) - header_len, 0, 0));
if (next_gop > 0)
towrite = MIN (next_gop, towrite);
outbuf = gst_rtp_buffer_new_allocate (header_len, 0, 0);
gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
/* last fragment gets the marker bit set */
gst_rtp_buffer_set_marker (&rtp, avail > towrite ? 0 : 1);
payload = gst_rtp_buffer_get_payload (&rtp);
/* 0 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | RR |P|V| PLEN |PEBIT|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/* if fragmented or gop header , write p bit =1 */
payload[0] = (fragmented && !found_gob) ? 0x00 : 0x04;
payload[1] = 0;
GST_BUFFER_PTS (outbuf) = rtph263ppay->first_timestamp;
GST_BUFFER_DURATION (outbuf) = rtph263ppay->first_duration;
gst_rtp_buffer_unmap (&rtp);
payload_buf = gst_adapter_take_buffer_fast (rtph263ppay->adapter, towrite);
gst_rtp_copy_video_meta (rtph263ppay, outbuf, payload_buf);
outbuf = gst_buffer_append (outbuf, payload_buf);
avail -= towrite;
/* If more data is available and this is our first iteration,
* we create a buffer list and remember that we're fragmented.
*
* If we're fragmented already, add buffers to the previously
* created buffer list.
*
* Otherwise fragmented will be FALSE and we just push the single output
* buffer, and no list is allocated.
*/
if (avail && !fragmented) {
fragmented = TRUE;
list = gst_buffer_list_new ();
gst_buffer_list_add (list, outbuf);
} else if (fragmented) {
gst_buffer_list_add (list, outbuf);
}
}
if (fragmented) {
ret =
gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtph263ppay),
list);
} else {
ret =
gst_rtp_base_payload_push (GST_RTP_BASE_PAYLOAD (rtph263ppay), outbuf);
}
return ret;
}
static GstFlowReturn
gst_rtp_h263p_pay_handle_buffer (GstRTPBasePayload * payload,
GstBuffer * buffer)
{
GstRtpH263PPay *rtph263ppay;
GstFlowReturn ret;
rtph263ppay = GST_RTP_H263P_PAY (payload);
rtph263ppay->first_timestamp = GST_BUFFER_PTS (buffer);
rtph263ppay->first_duration = GST_BUFFER_DURATION (buffer);
/* we always encode and flush a full picture */
gst_adapter_push (rtph263ppay->adapter, buffer);
ret = gst_rtp_h263p_pay_flush (rtph263ppay);
return ret;
}
gboolean
gst_rtp_h263p_pay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtph263ppay",
GST_RANK_SECONDARY, GST_TYPE_RTP_H263P_PAY);
}
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