gstreamer/gst/rtp/gstrtph263depay.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

447 lines
14 KiB
C

/* GStreamer
*
* Copyright 2007 Nokia Corporation
* Copyright 2007 Collabora Ltd,
* @author: Philippe Kalaf <philippe.kalaf@collabora.co.uk>
*
* Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.com>
* <2007> Edward Hervey <bilboed@bilboed.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 <gst/rtp/gstrtpbuffer.h>
#include <gst/video/video.h>
#include "gstrtph263depay.h"
#include "gstrtputils.h"
GST_DEBUG_CATEGORY_STATIC (rtph263depay_debug);
#define GST_CAT_DEFAULT (rtph263depay_debug)
#define GST_RFC2190A_HEADER_LEN 4
#define GST_RFC2190B_HEADER_LEN 8
#define GST_RFC2190C_HEADER_LEN 12
static GstStaticPadTemplate gst_rtp_h263_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h263, "
"variant = (string) \"itu\", " "h263version = (string) \"h263\"")
);
static GstStaticPadTemplate gst_rtp_h263_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"video\", "
"payload = (int) " GST_RTP_PAYLOAD_H263_STRING ", "
"clock-rate = (int) 90000; "
/* optional SDP attribute:
* "a-framesize = (string) \"1234-1234\", "
*/
"application/x-rtp, "
"media = (string) \"video\", "
"clock-rate = (int) 90000, " "encoding-name = (string) \"H263\""
/* optional SDP attribute:
* "a-framesize = (string) \"1234-1234\", "
*/
)
);
#define gst_rtp_h263_depay_parent_class parent_class
G_DEFINE_TYPE (GstRtpH263Depay, gst_rtp_h263_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
static void gst_rtp_h263_depay_finalize (GObject * object);
static GstStateChangeReturn gst_rtp_h263_depay_change_state (GstElement *
element, GstStateChange transition);
static GstBuffer *gst_rtp_h263_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp);
gboolean gst_rtp_h263_depay_setcaps (GstRTPBaseDepayload * filter,
GstCaps * caps);
static void
gst_rtp_h263_depay_class_init (GstRtpH263DepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
GST_DEBUG_CATEGORY_INIT (rtph263depay_debug, "rtph263depay", 0,
"H263 Video RTP Depayloader");
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gobject_class->finalize = gst_rtp_h263_depay_finalize;
gstelement_class->change_state = gst_rtp_h263_depay_change_state;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_h263_depay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_h263_depay_sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"RTP H263 depayloader", "Codec/Depayloader/Network/RTP",
"Extracts H263 video from RTP packets (RFC 2190)",
"Philippe Kalaf <philippe.kalaf@collabora.co.uk>, "
"Edward Hervey <bilboed@bilboed.com>");
gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_h263_depay_process;
gstrtpbasedepayload_class->set_caps = gst_rtp_h263_depay_setcaps;
}
static void
gst_rtp_h263_depay_init (GstRtpH263Depay * rtph263depay)
{
rtph263depay->adapter = gst_adapter_new ();
rtph263depay->offset = 0;
rtph263depay->leftover = 0;
}
static void
gst_rtp_h263_depay_finalize (GObject * object)
{
GstRtpH263Depay *rtph263depay;
rtph263depay = GST_RTP_H263_DEPAY (object);
g_object_unref (rtph263depay->adapter);
rtph263depay->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_rtp_h263_parse_framesize (GstRTPBaseDepayload * filter,
const gchar * media_attr, GstCaps * srccaps)
{
gchar *dimension, *endptr;
gint width, height;
GstStructure *d;
width = g_ascii_strtoull (media_attr, &endptr, 10);
if (width <= 0) {
GST_ERROR_OBJECT (filter,
"Framesize media attribute width out of valid range");
return FALSE;
} else if (*endptr != '-') {
GST_ERROR_OBJECT (filter,
"Framesize media attribute has invalid dimension separator");
return FALSE;
}
dimension = endptr + 1;
height = g_ascii_strtoull (dimension, &endptr, 10);
if (height <= 0) {
GST_ERROR_OBJECT (filter,
"Framesize media attribute height out of valid range");
return FALSE;
} else if (*endptr != '\0') {
GST_ERROR_OBJECT (filter,
"Framesize media attribute unexpectedly has trailing characters");
return FALSE;
}
d = gst_caps_get_structure (srccaps, 0);
gst_structure_set (d, "width", G_TYPE_INT, width, "height", G_TYPE_INT,
height, NULL);
return TRUE;
}
gboolean
gst_rtp_h263_depay_setcaps (GstRTPBaseDepayload * filter, GstCaps * caps)
{
GstCaps *srccaps;
GstStructure *structure = gst_caps_get_structure (caps, 0);
gint clock_rate;
const gchar *framesize;
srccaps = gst_caps_new_simple ("video/x-h263",
"variant", G_TYPE_STRING, "itu",
"h263version", G_TYPE_STRING, "h263", NULL);
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
clock_rate = 90000; /* default */
filter->clock_rate = clock_rate;
framesize = gst_structure_get_string (structure, "a-framesize");
if (framesize != NULL) {
if (!gst_rtp_h263_parse_framesize (filter, framesize, srccaps)) {
return FALSE;
}
}
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (filter), srccaps);
gst_caps_unref (srccaps);
return TRUE;
}
static GstBuffer *
gst_rtp_h263_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
{
GstRtpH263Depay *rtph263depay;
GstBuffer *outbuf;
gint payload_len;
guint8 *payload;
guint header_len;
guint SBIT, EBIT;
gboolean F, P, M;
gboolean I;
rtph263depay = GST_RTP_H263_DEPAY (depayload);
/* flush remaining data on discont */
if (GST_BUFFER_IS_DISCONT (rtp->buffer)) {
GST_LOG_OBJECT (depayload, "Discont buffer, flushing adapter");
gst_adapter_clear (rtph263depay->adapter);
rtph263depay->offset = 0;
rtph263depay->leftover = 0;
rtph263depay->start = FALSE;
}
payload_len = gst_rtp_buffer_get_payload_len (rtp);
payload = gst_rtp_buffer_get_payload (rtp);
M = gst_rtp_buffer_get_marker (rtp);
if (payload_len < 1)
goto too_small;
/* Let's see what mode we are using */
F = (payload[0] & 0x80) == 0x80;
P = (payload[0] & 0x40) == 0x40;
/* Bit shifting */
SBIT = (payload[0] & 0x38) >> 3;
EBIT = (payload[0] & 0x07);
/* Figure out header length and I-flag */
if (F == 0) {
/* F == 0 and P == 0 or 1
* mode A */
header_len = GST_RFC2190A_HEADER_LEN;
GST_LOG ("Mode A");
/* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |F|P|SBIT |EBIT | SRC |I|U|S|A|R |DBQ| TRB | TR |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (payload_len <= header_len)
goto too_small;
I = (payload[1] & 0x10) == 0x10;
} else {
if (P == 0) {
/* F == 1 and P == 0
* mode B */
header_len = GST_RFC2190B_HEADER_LEN;
GST_LOG ("Mode B");
/* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |F|P|SBIT |EBIT | SRC | QUANT | GOBN | MBA |R |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (payload_len <= header_len)
goto too_small;
I = (payload[4] & 0x80) == 0x80;
} else {
/* F == 1 and P == 1
* mode C */
header_len = GST_RFC2190C_HEADER_LEN;
GST_LOG ("Mode C");
/* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |F|P|SBIT |EBIT | SRC | QUANT | GOBN | MBA |R |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | RR |DBQ| TRB | TR |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (payload_len <= header_len)
goto too_small;
I = (payload[4] & 0x80) == 0x80;
}
}
GST_LOG ("F/P/M/I : %d/%d/%d/%d", F, P, M, I);
GST_LOG ("SBIT : %d , EBIT : %d", SBIT, EBIT);
GST_LOG ("payload_len : %d, header_len : %d , leftover : 0x%x",
payload_len, header_len, rtph263depay->leftover);
/* skip header */
payload += header_len;
payload_len -= header_len;
if (!rtph263depay->start) {
/* only mode A should be used when there is a picture start code, but
* buggy payloaders may send mode B/C in start of frame */
if (payload_len > 4 && (GST_READ_UINT32_BE (payload) >> 10 == 0x20)) {
GST_DEBUG ("Mode %c with PSC => frame start", "ABC"[F + P]);
rtph263depay->start = TRUE;
if ((! !(payload[4] & 0x02)) != I) {
GST_DEBUG ("Wrong Picture Coding Type Flag in rtp header");
I = !I;
}
rtph263depay->psc_I = I;
} else {
GST_DEBUG ("no frame start yet, skipping payload");
goto skip;
}
}
/* only trust I info from Mode A starting packet
* from buggy payloaders or hw */
I = rtph263depay->psc_I;
if (SBIT) {
/* take the leftover and merge it at the beginning, FIXME make the buffer
* data writable. */
GST_LOG ("payload[0] : 0x%x", payload[0]);
payload[0] &= 0xFF >> SBIT;
GST_LOG ("payload[0] : 0x%x", payload[0]);
payload[0] |= rtph263depay->leftover;
GST_LOG ("payload[0] : 0x%x", payload[0]);
rtph263depay->leftover = 0;
rtph263depay->offset = 0;
}
if (!EBIT) {
GstBuffer *tmp;
/* Take the entire buffer */
tmp = gst_rtp_buffer_get_payload_subbuffer (rtp, header_len, payload_len);
gst_adapter_push (rtph263depay->adapter, tmp);
} else {
GstBuffer *tmp;
/* Take the entire buffer except for the last byte */
tmp = gst_rtp_buffer_get_payload_subbuffer (rtp, header_len,
payload_len - 1);
gst_adapter_push (rtph263depay->adapter, tmp);
/* Put the last byte into the leftover */
GST_DEBUG ("payload[payload_len - 1] : 0x%x", payload[payload_len - 1]);
GST_DEBUG ("mask : 0x%x", 0xFF << EBIT);
rtph263depay->leftover = (payload[payload_len - 1] >> EBIT) << EBIT;
rtph263depay->offset = 1;
GST_DEBUG ("leftover : 0x%x", rtph263depay->leftover);
}
skip:
if (M) {
if (rtph263depay->start) {
/* frame is completed */
guint avail;
if (rtph263depay->offset) {
/* push in the leftover */
GstBuffer *buf = gst_buffer_new_and_alloc (1);
GST_DEBUG ("Pushing leftover in adapter");
gst_buffer_fill (buf, 0, &rtph263depay->leftover, 1);
gst_adapter_push (rtph263depay->adapter, buf);
}
avail = gst_adapter_available (rtph263depay->adapter);
outbuf = gst_adapter_take_buffer (rtph263depay->adapter, avail);
if (I)
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
GST_DEBUG ("Pushing out a buffer of %d bytes", avail);
gst_rtp_drop_non_video_meta (rtph263depay, outbuf);
gst_rtp_base_depayload_push (depayload, outbuf);
rtph263depay->offset = 0;
rtph263depay->leftover = 0;
rtph263depay->start = FALSE;
} else {
rtph263depay->start = TRUE;
}
}
return NULL;
too_small:
{
GST_ELEMENT_WARNING (rtph263depay, STREAM, DECODE,
("Packet payload was too small"), (NULL));
return NULL;
}
}
static GstStateChangeReturn
gst_rtp_h263_depay_change_state (GstElement * element,
GstStateChange transition)
{
GstRtpH263Depay *rtph263depay;
GstStateChangeReturn ret;
rtph263depay = GST_RTP_H263_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_adapter_clear (rtph263depay->adapter);
rtph263depay->start = TRUE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
gboolean
gst_rtp_h263_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtph263depay",
GST_RANK_SECONDARY, GST_TYPE_RTP_H263_DEPAY);
}