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gstreamer/subprojects/gst-plugins-good/gst/rtp/gstrtpvrawdepay.c
Tim-Philipp Müller d415816cb1 rtpvrawdepay: only announce supported formats in sink template 
For most video formats we currently just assume that they
have a depth of 8 bits, whilst advertising that we can
handle 8/10/12/16 bit depth.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5866>
2023-12-25 19:00:18 +01:00

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/* GStreamer
* Copyright (C) <2008> 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 <gst/rtp/gstrtpbuffer.h>
#include <gst/video/video.h>
#include <string.h>
#include <stdlib.h>
#include "gstrtpelements.h"
#include "gstrtpvrawdepay.h"
#include "gstrtputils.h"
GST_DEBUG_CATEGORY_STATIC (rtpvrawdepay_debug);
#define GST_CAT_DEFAULT (rtpvrawdepay_debug)
static GstStaticPadTemplate gst_rtp_vraw_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw")
);
static GstStaticPadTemplate gst_rtp_vraw_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) \"RAW\", "
"sampling = (string) { \"RGB\", \"RGBA\", \"BGR\", \"BGRA\", "
"\"YCbCr-4:4:4\", \"YCbCr-4:2:2\", \"YCbCr-4:2:0\", "
"\"YCbCr-4:1:1\" },"
/* we cannot express these as strings
* "width = (string) [1 32767],"
* "height = (string) [1 32767],"
*/
"depth = (string) 8; "
"application/x-rtp, "
"media = (string) video, "
"clock-rate = (int) 90000, "
"encoding-name = (string) RAW, sampling = (string) YCbCr-4:2:2,"
/* we cannot express these as strings
* "width = (string) [1 32767],"
* "height = (string) [1 32767],"
*/
"depth = (string) 10")
);
#define gst_rtp_vraw_depay_parent_class parent_class
G_DEFINE_TYPE (GstRtpVRawDepay, gst_rtp_vraw_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpvrawdepay, "rtpvrawdepay",
GST_RANK_SECONDARY, GST_TYPE_RTP_VRAW_DEPAY, rtp_element_init (plugin));
static gboolean gst_rtp_vraw_depay_setcaps (GstRTPBaseDepayload * depayload,
GstCaps * caps);
static GstBuffer *gst_rtp_vraw_depay_process_packet (GstRTPBaseDepayload *
depay, GstRTPBuffer * rtp);
static GstStateChangeReturn gst_rtp_vraw_depay_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_rtp_vraw_depay_handle_event (GstRTPBaseDepayload * filter,
GstEvent * event);
static void
gst_rtp_vraw_depay_class_init (GstRtpVRawDepayClass * klass)
{
GstElementClass *gstelement_class;
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
gstelement_class = (GstElementClass *) klass;
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gstelement_class->change_state = gst_rtp_vraw_depay_change_state;
gstrtpbasedepayload_class->set_caps = gst_rtp_vraw_depay_setcaps;
gstrtpbasedepayload_class->process_rtp_packet =
gst_rtp_vraw_depay_process_packet;
gstrtpbasedepayload_class->handle_event = gst_rtp_vraw_depay_handle_event;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_vraw_depay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_vraw_depay_sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"RTP Raw Video depayloader", "Codec/Depayloader/Network/RTP",
"Extracts raw video from RTP packets (RFC 4175)",
"Wim Taymans <wim.taymans@gmail.com>");
GST_DEBUG_CATEGORY_INIT (rtpvrawdepay_debug, "rtpvrawdepay", 0,
"raw video RTP Depayloader");
}
static void
gst_rtp_vraw_depay_init (GstRtpVRawDepay * rtpvrawdepay)
{
}
static void
gst_rtp_vraw_depay_reset (GstRtpVRawDepay * rtpvrawdepay, gboolean full)
{
if (rtpvrawdepay->outbuf) {
gst_video_frame_unmap (&rtpvrawdepay->frame);
gst_buffer_unref (rtpvrawdepay->outbuf);
rtpvrawdepay->outbuf = NULL;
}
rtpvrawdepay->timestamp = -1;
if (full && rtpvrawdepay->pool) {
gst_buffer_pool_set_active (rtpvrawdepay->pool, FALSE);
gst_object_unref (rtpvrawdepay->pool);
rtpvrawdepay->pool = NULL;
}
}
static GstFlowReturn
gst_rtp_vraw_depay_negotiate_pool (GstRtpVRawDepay * depay, GstCaps * caps,
GstVideoInfo * info)
{
GstQuery *query;
GstBufferPool *pool = NULL;
guint size, min, max;
GstStructure *config;
/* find a pool for the negotiated caps now */
query = gst_query_new_allocation (caps, TRUE);
if (!gst_pad_peer_query (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depay), query)) {
/* not a problem, we use the defaults of query */
GST_DEBUG_OBJECT (depay, "could not get downstream ALLOCATION hints");
}
if (gst_query_get_n_allocation_pools (query) > 0) {
/* we got configuration from our peer, parse them */
gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
} else {
GST_DEBUG_OBJECT (depay, "didn't get downstream pool hints");
size = info->size;
min = max = 0;
}
if (pool == NULL) {
/* we did not get a pool, make one ourselves then */
pool = gst_video_buffer_pool_new ();
}
if (depay->pool)
gst_object_unref (depay->pool);
depay->pool = pool;
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, caps, size, min, max);
if (gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL)) {
/* just set the metadata, if the pool can support it we will transparently use
* it through the video info API. We could also see if the pool support this
* metadata and only activate it then. */
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
}
gst_buffer_pool_set_config (pool, config);
/* and activate */
gst_buffer_pool_set_active (pool, TRUE);
gst_query_unref (query);
return GST_FLOW_OK;
}
static gboolean
gst_rtp_vraw_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
{
GstStructure *structure;
GstRtpVRawDepay *rtpvrawdepay;
gint clock_rate;
const gchar *str;
gint format, width, height, depth, pgroup, xinc, yinc;
GstCaps *srccaps;
gboolean res;
GstFlowReturn ret;
rtpvrawdepay = GST_RTP_VRAW_DEPAY (depayload);
structure = gst_caps_get_structure (caps, 0);
xinc = yinc = 1;
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
clock_rate = 90000; /* default */
depayload->clock_rate = clock_rate;
if (!(str = gst_structure_get_string (structure, "width")))
goto no_width;
width = atoi (str);
if (!(str = gst_structure_get_string (structure, "height")))
goto no_height;
height = atoi (str);
if (!(str = gst_structure_get_string (structure, "depth")))
goto no_depth;
depth = atoi (str);
/* optional interlace value but we don't handle interlaced
* formats yet */
if (gst_structure_get_string (structure, "interlace"))
goto interlaced;
if (!(str = gst_structure_get_string (structure, "sampling")))
goto no_sampling;
if (!strcmp (str, "RGB")) {
format = GST_VIDEO_FORMAT_RGB;
pgroup = 3;
} else if (!strcmp (str, "RGBA")) {
format = GST_VIDEO_FORMAT_RGBA;
pgroup = 4;
} else if (!strcmp (str, "BGR")) {
format = GST_VIDEO_FORMAT_BGR;
pgroup = 3;
} else if (!strcmp (str, "BGRA")) {
format = GST_VIDEO_FORMAT_BGRA;
pgroup = 4;
} else if (!strcmp (str, "YCbCr-4:4:4")) {
format = GST_VIDEO_FORMAT_AYUV;
pgroup = 3;
} else if (!strcmp (str, "YCbCr-4:2:2")) {
if (depth == 8) {
format = GST_VIDEO_FORMAT_UYVY;
pgroup = 4;
} else if (depth == 10) {
format = GST_VIDEO_FORMAT_UYVP;
pgroup = 5;
} else
goto unknown_format;
xinc = 2;
} else if (!strcmp (str, "YCbCr-4:2:0")) {
format = GST_VIDEO_FORMAT_I420;
pgroup = 6;
xinc = yinc = 2;
} else if (!strcmp (str, "YCbCr-4:1:1")) {
format = GST_VIDEO_FORMAT_Y41B;
pgroup = 6;
xinc = 4;
} else {
goto unknown_format;
}
gst_video_info_init (&rtpvrawdepay->vinfo);
gst_video_info_set_format (&rtpvrawdepay->vinfo, format, width, height);
GST_VIDEO_INFO_FPS_N (&rtpvrawdepay->vinfo) = 0;
GST_VIDEO_INFO_FPS_D (&rtpvrawdepay->vinfo) = 1;
rtpvrawdepay->pgroup = pgroup;
rtpvrawdepay->xinc = xinc;
rtpvrawdepay->yinc = yinc;
srccaps = gst_video_info_to_caps (&rtpvrawdepay->vinfo);
res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
gst_caps_unref (srccaps);
GST_DEBUG_OBJECT (depayload, "width %d, height %d, format %d", width, height,
format);
GST_DEBUG_OBJECT (depayload, "xinc %d, yinc %d, pgroup %d",
xinc, yinc, pgroup);
/* negotiate a bufferpool */
if ((ret = gst_rtp_vraw_depay_negotiate_pool (rtpvrawdepay, srccaps,
&rtpvrawdepay->vinfo)) != GST_FLOW_OK)
goto no_bufferpool;
return res;
/* ERRORS */
no_width:
{
GST_ERROR_OBJECT (depayload, "no width specified");
return FALSE;
}
no_height:
{
GST_ERROR_OBJECT (depayload, "no height specified");
return FALSE;
}
no_depth:
{
GST_ERROR_OBJECT (depayload, "no depth specified");
return FALSE;
}
interlaced:
{
GST_ERROR_OBJECT (depayload, "interlaced formats not supported yet");
return FALSE;
}
no_sampling:
{
GST_ERROR_OBJECT (depayload, "no sampling specified");
return FALSE;
}
unknown_format:
{
GST_ERROR_OBJECT (depayload, "unknown sampling format '%s'", str);
return FALSE;
}
no_bufferpool:
{
GST_DEBUG_OBJECT (depayload, "no bufferpool");
return FALSE;
}
}
static GstBuffer *
gst_rtp_vraw_depay_process_packet (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp)
{
GstRtpVRawDepay *rtpvrawdepay;
guint8 *payload, *p0, *yp, *up, *vp, *headers;
guint32 timestamp;
guint cont, ystride, uvstride, pgroup, payload_len;
gint width, height, xinc, yinc;
GstVideoFrame *frame;
gboolean marker;
GstBuffer *outbuf = NULL;
rtpvrawdepay = GST_RTP_VRAW_DEPAY (depayload);
timestamp = gst_rtp_buffer_get_timestamp (rtp);
if (timestamp != rtpvrawdepay->timestamp || rtpvrawdepay->outbuf == NULL) {
GstBuffer *new_buffer;
GstFlowReturn ret;
GST_LOG_OBJECT (depayload, "new frame with timestamp %u", timestamp);
/* new timestamp, flush old buffer and create new output buffer */
if (rtpvrawdepay->outbuf) {
gst_video_frame_unmap (&rtpvrawdepay->frame);
gst_rtp_base_depayload_push (depayload, rtpvrawdepay->outbuf);
rtpvrawdepay->outbuf = NULL;
}
if (gst_pad_check_reconfigure (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload))) {
GstCaps *caps;
caps =
gst_pad_get_current_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload));
gst_rtp_vraw_depay_negotiate_pool (rtpvrawdepay, caps,
&rtpvrawdepay->vinfo);
gst_caps_unref (caps);
}
ret =
gst_buffer_pool_acquire_buffer (rtpvrawdepay->pool, &new_buffer, NULL);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto alloc_failed;
/* clear timestamp from alloc... */
GST_BUFFER_PTS (new_buffer) = -1;
if (!gst_video_frame_map (&rtpvrawdepay->frame, &rtpvrawdepay->vinfo,
new_buffer, GST_MAP_WRITE | GST_VIDEO_FRAME_MAP_FLAG_NO_REF)) {
gst_buffer_unref (new_buffer);
goto invalid_frame;
}
rtpvrawdepay->outbuf = new_buffer;
rtpvrawdepay->timestamp = timestamp;
}
frame = &rtpvrawdepay->frame;
g_assert (frame->buffer != NULL);
/* get pointer and strides of the planes */
p0 = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
yp = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
up = GST_VIDEO_FRAME_COMP_DATA (frame, 1);
vp = GST_VIDEO_FRAME_COMP_DATA (frame, 2);
ystride = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);
uvstride = GST_VIDEO_FRAME_COMP_STRIDE (frame, 1);
pgroup = rtpvrawdepay->pgroup;
width = GST_VIDEO_INFO_WIDTH (&rtpvrawdepay->vinfo);
height = GST_VIDEO_INFO_HEIGHT (&rtpvrawdepay->vinfo);
xinc = rtpvrawdepay->xinc;
yinc = rtpvrawdepay->yinc;
payload = gst_rtp_buffer_get_payload (rtp);
payload_len = gst_rtp_buffer_get_payload_len (rtp);
if (payload_len < 3)
goto short_packet;
/* skip extended seqnum */
payload += 2;
payload_len -= 2;
/* remember header position */
headers = payload;
gst_rtp_copy_video_meta (rtpvrawdepay, frame->buffer, rtp->buffer);
/* find data start */
do {
if (payload_len < 6)
goto short_packet;
cont = payload[4] & 0x80;
payload += 6;
payload_len -= 6;
} while (cont);
while (TRUE) {
guint length, line, offs, plen;
guint8 *datap;
/* stop when we run out of data */
if (payload_len == 0)
break;
/* read length and cont. This should work because we iterated the headers
* above. */
length = (headers[0] << 8) | headers[1];
line = ((headers[2] & 0x7f) << 8) | headers[3];
offs = ((headers[4] & 0x7f) << 8) | headers[5];
cont = headers[4] & 0x80;
headers += 6;
/* length must be a multiple of pgroup */
if (length % pgroup != 0)
goto wrong_length;
if (length > payload_len)
length = payload_len;
/* sanity check */
if (line > (height - yinc)) {
GST_WARNING_OBJECT (depayload, "skipping line %d: out of range", line);
goto next;
}
if (offs > (width - xinc)) {
GST_WARNING_OBJECT (depayload, "skipping offset %d: out of range", offs);
goto next;
}
/* calculate the maximum amount of bytes we can use per line */
if (offs + ((length / pgroup) * xinc) > width) {
plen = ((width - offs) * pgroup) / xinc;
GST_WARNING_OBJECT (depayload, "clipping length %d, offset %d, plen %d",
length, offs, plen);
} else
plen = length;
GST_LOG_OBJECT (depayload,
"writing length %u/%u, line %u, offset %u, remaining %u", plen, length,
line, offs, payload_len);
switch (GST_VIDEO_INFO_FORMAT (&rtpvrawdepay->vinfo)) {
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGR:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_UYVY:
case GST_VIDEO_FORMAT_UYVP:
/* samples are packed just like gstreamer packs them */
offs /= xinc;
datap = p0 + (line * ystride) + (offs * pgroup);
memcpy (datap, payload, plen);
break;
case GST_VIDEO_FORMAT_AYUV:
{
gint i;
guint8 *p;
datap = p0 + (line * ystride) + (offs * 4);
p = payload;
/* samples are packed in order Cb-Y-Cr for both interlaced and
* progressive frames */
for (i = 0; i < plen; i += pgroup) {
*datap++ = 0;
*datap++ = p[1];
*datap++ = p[0];
*datap++ = p[2];
p += pgroup;
}
break;
}
case GST_VIDEO_FORMAT_I420:
{
gint i;
guint uvoff;
guint8 *yd1p, *yd2p, *udp, *vdp, *p;
yd1p = yp + (line * ystride) + (offs);
yd2p = yd1p + ystride;
uvoff = (line / yinc * uvstride) + (offs / xinc);
udp = up + uvoff;
vdp = vp + uvoff;
p = payload;
/* line 0/1: Y00-Y01-Y10-Y11-Cb00-Cr00 Y02-Y03-Y12-Y13-Cb01-Cr01 ... */
for (i = 0; i < plen; i += pgroup) {
*yd1p++ = p[0];
*yd1p++ = p[1];
*yd2p++ = p[2];
*yd2p++ = p[3];
*udp++ = p[4];
*vdp++ = p[5];
p += pgroup;
}
break;
}
case GST_VIDEO_FORMAT_Y41B:
{
gint i;
guint uvoff;
guint8 *ydp, *udp, *vdp, *p;
ydp = yp + (line * ystride) + (offs);
uvoff = (line / yinc * uvstride) + (offs / xinc);
udp = up + uvoff;
vdp = vp + uvoff;
p = payload;
/* Samples are packed in order Cb0-Y0-Y1-Cr0-Y2-Y3 for both interlaced
* and progressive scan lines */
for (i = 0; i < plen; i += pgroup) {
*udp++ = p[0];
*ydp++ = p[1];
*ydp++ = p[2];
*vdp++ = p[3];
*ydp++ = p[4];
*ydp++ = p[5];
p += pgroup;
}
break;
}
default:
goto unknown_sampling;
}
next:
if (!cont)
break;
payload += length;
payload_len -= length;
}
marker = gst_rtp_buffer_get_marker (rtp);
if (marker) {
GST_LOG_OBJECT (depayload, "marker, flushing frame");
gst_video_frame_unmap (&rtpvrawdepay->frame);
outbuf = rtpvrawdepay->outbuf;
rtpvrawdepay->outbuf = NULL;
rtpvrawdepay->timestamp = -1;
}
return outbuf;
/* ERRORS */
unknown_sampling:
{
GST_ELEMENT_ERROR (depayload, STREAM, FORMAT,
(NULL), ("unimplemented sampling"));
return NULL;
}
alloc_failed:
{
GST_WARNING_OBJECT (depayload, "failed to alloc output buffer");
return NULL;
}
invalid_frame:
{
GST_ERROR_OBJECT (depayload, "could not map video frame");
return NULL;
}
wrong_length:
{
GST_WARNING_OBJECT (depayload, "length not multiple of pgroup");
return NULL;
}
short_packet:
{
GST_WARNING_OBJECT (depayload, "short packet");
return NULL;
}
}
static gboolean
gst_rtp_vraw_depay_handle_event (GstRTPBaseDepayload * filter, GstEvent * event)
{
gboolean ret;
GstRtpVRawDepay *rtpvrawdepay;
rtpvrawdepay = GST_RTP_VRAW_DEPAY (filter);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_rtp_vraw_depay_reset (rtpvrawdepay, FALSE);
break;
default:
break;
}
ret =
GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (filter, event);
return ret;
}
static GstStateChangeReturn
gst_rtp_vraw_depay_change_state (GstElement * element,
GstStateChange transition)
{
GstRtpVRawDepay *rtpvrawdepay;
GstStateChangeReturn ret;
rtpvrawdepay = GST_RTP_VRAW_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rtp_vraw_depay_reset (rtpvrawdepay, TRUE);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_rtp_vraw_depay_reset (rtpvrawdepay, TRUE);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
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