gstreamer/gst/rtp/gstrtpsv3vdepay.c
Tim-Philipp Müller 6717c86061 rtp: depayloaders: implement process_rtp_packet() vfunc
For more optimised RTP packet handling: means we don't
need to map the input buffer again but can just re-use
the mapping the base class has already done.

https://bugzilla.gnome.org/show_bug.cgi?id=750235
2015-07-12 14:28:29 +01:00

319 lines
9.3 KiB
C

/* 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 <gst/rtp/gstrtpbuffer.h>
#include "gstrtpsv3vdepay.h"
GST_DEBUG_CATEGORY (rtpsv3vdepay_debug);
#define GST_CAT_DEFAULT rtpsv3vdepay_debug
static GstStaticPadTemplate gst_rtp_sv3v_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-svq, " "svqversion = (int) 3")
);
static GstStaticPadTemplate gst_rtp_sv3v_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"video\", "
"clock-rate = (int) 90000, "
"encoding-name = (string) { \"X-SV3V-ES\", \"X-SORENSON-VIDEO\" , \"X-SORENSONVIDEO\" , \"X-SorensonVideo\" }")
);
#define gst_rtp_sv3v_depay_parent_class parent_class
G_DEFINE_TYPE (GstRtpSV3VDepay, gst_rtp_sv3v_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
static void gst_rtp_sv3v_depay_finalize (GObject * object);
static GstStateChangeReturn gst_rtp_sv3v_depay_change_state (GstElement *
element, GstStateChange transition);
static GstBuffer *gst_rtp_sv3v_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp);
gboolean gst_rtp_sv3v_depay_setcaps (GstRTPBaseDepayload * filter,
GstCaps * caps);
static void
gst_rtp_sv3v_depay_class_init (GstRtpSV3VDepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_sv3v_depay_process;
gstrtpbasedepayload_class->set_caps = gst_rtp_sv3v_depay_setcaps;
gobject_class->finalize = gst_rtp_sv3v_depay_finalize;
gstelement_class->change_state = gst_rtp_sv3v_depay_change_state;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_sv3v_depay_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_sv3v_depay_sink_template));
gst_element_class_set_static_metadata (gstelement_class,
"RTP SVQ3 depayloader", "Codec/Depayloader/Network/RTP",
"Extracts SVQ3 video from RTP packets (no RFC)",
"Wim Taymans <wim.taymans@gmail.com>");
}
static void
gst_rtp_sv3v_depay_init (GstRtpSV3VDepay * rtpsv3vdepay)
{
rtpsv3vdepay->adapter = gst_adapter_new ();
}
static void
gst_rtp_sv3v_depay_finalize (GObject * object)
{
GstRtpSV3VDepay *rtpsv3vdepay;
rtpsv3vdepay = GST_RTP_SV3V_DEPAY (object);
g_object_unref (rtpsv3vdepay->adapter);
rtpsv3vdepay->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* only on the sink */
gboolean
gst_rtp_sv3v_depay_setcaps (GstRTPBaseDepayload * filter, GstCaps * caps)
{
GstStructure *structure = gst_caps_get_structure (caps, 0);
gint clock_rate;
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
clock_rate = 90000; /* default */
filter->clock_rate = clock_rate;
/* will set caps later */
return TRUE;
}
static GstBuffer *
gst_rtp_sv3v_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
{
GstRtpSV3VDepay *rtpsv3vdepay;
static struct
{
guint width, height;
} resolutions[7] = {
{
160, 128}, {
128, 96}, {
176, 144}, {
352, 288}, {
704, 576}, {
240, 180}, {
320, 240}
};
gint payload_len;
guint8 *payload;
gboolean M;
gboolean C, S, E;
GstBuffer *outbuf = NULL;
guint16 seq;
rtpsv3vdepay = GST_RTP_SV3V_DEPAY (depayload);
/* flush on sequence number gaps */
seq = gst_rtp_buffer_get_seq (rtp);
GST_DEBUG ("timestamp %" GST_TIME_FORMAT ", sequence number:%d",
GST_TIME_ARGS (GST_BUFFER_PTS (rtp->buffer)), seq);
if (seq != rtpsv3vdepay->nextseq) {
GST_DEBUG ("Sequence discontinuity, clearing adapter");
gst_adapter_clear (rtpsv3vdepay->adapter);
}
rtpsv3vdepay->nextseq = seq + 1;
payload_len = gst_rtp_buffer_get_payload_len (rtp);
if (payload_len < 3)
goto bad_packet;
payload = gst_rtp_buffer_get_payload (rtp);
M = gst_rtp_buffer_get_marker (rtp);
/* This is all a guess:
* 1 1 1 1 1 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |0|C|S|E|0|0|0|0|0|0|0|0|0|0|0|0|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* C: config, packet contains config info
* S: start, packet contains start of frame
* E: end, packet contains end of frame
*/
/* this seems to indicate a packet with a config string sent before each
* keyframe */
C = (payload[0] & 0x40) == 0x40;
/* redundant with the RTP marker bit */
S = (payload[0] & 0x20) == 0x20;
E = (payload[0] & 0x10) == 0x10;
GST_DEBUG ("M:%d, C:%d, S:%d, E:%d", M, C, S, E);
GST_MEMDUMP ("incoming buffer", payload, payload_len);
if (G_UNLIKELY (C)) {
GstCaps *caps;
GstBuffer *codec_data;
GstMapInfo cmap;
guint8 res;
GST_DEBUG ("Configuration packet");
/* if we already have caps, we don't need to do anything. FIXME, check if
* something changed. */
if (G_UNLIKELY (gst_pad_has_current_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD
(depayload)))) {
GST_DEBUG ("Already configured, skipping config parsing");
goto beach;
}
res = payload[2] >> 5;
/* width and height, according to http://wiki.multimedia.cx/index.php?title=Sorenson_Video_1#Stream_Format_And_Header */
if (G_LIKELY (res < 7)) {
rtpsv3vdepay->width = resolutions[res].width;
rtpsv3vdepay->height = resolutions[res].height;
} else {
/* extended width/height, they're contained in the following 24bit */
rtpsv3vdepay->width = ((payload[2] & 0x1f) << 7) | (payload[3] >> 1);
rtpsv3vdepay->height =
(payload[3] & 0x1) << 11 | payload[4] << 3 | (payload[5] >> 5);
}
/* CodecData needs to be 'SEQH' + len (32bit) + data according to
* ffmpeg's libavcodec/svq3.c:svq3_decode_init */
codec_data = gst_buffer_new_and_alloc (payload_len + 6);
gst_buffer_map (codec_data, &cmap, GST_MAP_WRITE);
memcpy (cmap.data, "SEQH", 4);
GST_WRITE_UINT32_LE (cmap.data + 4, payload_len - 2);
memcpy (cmap.data + 8, payload + 2, payload_len - 2);
GST_MEMDUMP ("codec_data", cmap.data, gst_buffer_get_size (codec_data));
gst_buffer_unmap (codec_data, &cmap);
caps = gst_caps_new_simple ("video/x-svq",
"svqversion", G_TYPE_INT, 3,
"width", G_TYPE_INT, rtpsv3vdepay->width,
"height", G_TYPE_INT, rtpsv3vdepay->height,
"codec_data", GST_TYPE_BUFFER, codec_data, NULL);
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), caps);
gst_caps_unref (caps);
GST_DEBUG ("Depayloader now configured");
rtpsv3vdepay->configured = TRUE;
goto beach;
}
if (G_LIKELY (rtpsv3vdepay->configured)) {
GstBuffer *tmpbuf;
GST_DEBUG ("Storing incoming payload");
/* store data in adapter, stip off 2 bytes header */
tmpbuf = gst_rtp_buffer_get_payload_subbuffer (rtp, 2, -1);
gst_adapter_push (rtpsv3vdepay->adapter, tmpbuf);
if (G_UNLIKELY (M)) {
/* frame is completed: push contents of adapter */
guint avail;
avail = gst_adapter_available (rtpsv3vdepay->adapter);
GST_DEBUG ("Returning completed output buffer [%d bytes]", avail);
outbuf = gst_adapter_take_buffer (rtpsv3vdepay->adapter, avail);
}
}
beach:
return outbuf;
/* ERRORS */
bad_packet:
{
GST_ELEMENT_WARNING (rtpsv3vdepay, STREAM, DECODE,
(NULL), ("Packet was too short"));
return NULL;
}
}
static GstStateChangeReturn
gst_rtp_sv3v_depay_change_state (GstElement * element,
GstStateChange transition)
{
GstRtpSV3VDepay *rtpsv3vdepay;
GstStateChangeReturn ret;
rtpsv3vdepay = GST_RTP_SV3V_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_adapter_clear (rtpsv3vdepay->adapter);
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_sv3v_depay_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (rtpsv3vdepay_debug, "rtpsv3vdepay", 0,
"RTP SV3V depayloader");
return gst_element_register (plugin, "rtpsv3vdepay",
GST_RANK_SECONDARY, GST_TYPE_RTP_SV3V_DEPAY);
}