gstreamer/gst/rtp/gstrtpj2kdepay.c

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/* GStreamer
* Copyright (C) <2009> 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 <string.h>
#include "gstrtpj2kdepay.h"
GST_DEBUG_CATEGORY_STATIC (rtpj2kdepay_debug);
#define GST_CAT_DEFAULT (rtpj2kdepay_debug)
static GstStaticPadTemplate gst_rtp_j2k_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/x-jpc")
);
static GstStaticPadTemplate gst_rtp_j2k_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_DYNAMIC_STRING ", "
"clock-rate = (int) 90000, " "encoding-name = (string) \"JPEG2000\"")
);
typedef enum
{
J2K_MARKER = 0xFF,
J2K_MARKER_SOC = 0x4F,
J2K_MARKER_SOT = 0x90,
J2K_MARKER_SOP = 0x91,
J2K_MARKER_SOD = 0x93,
J2K_MARKER_EOC = 0xD9
} RtpJ2KMarker;
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enum
{
PROP_0,
PROP_LAST
};
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#define gst_rtp_j2k_depay_parent_class parent_class
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G_DEFINE_TYPE (GstRtpJ2KDepay, gst_rtp_j2k_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
static void gst_rtp_j2k_depay_finalize (GObject * object);
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static void gst_rtp_j2k_depay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_j2k_depay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn
gst_rtp_j2k_depay_change_state (GstElement * element,
GstStateChange transition);
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static gboolean gst_rtp_j2k_depay_setcaps (GstRTPBaseDepayload * depayload,
GstCaps * caps);
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static GstBuffer *gst_rtp_j2k_depay_process (GstRTPBaseDepayload * depayload,
GstBuffer * buf);
static void
gst_rtp_j2k_depay_class_init (GstRtpJ2KDepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
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GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
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gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gobject_class->finalize = gst_rtp_j2k_depay_finalize;
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gobject_class->set_property = gst_rtp_j2k_depay_set_property;
gobject_class->get_property = gst_rtp_j2k_depay_get_property;
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gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_j2k_depay_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_j2k_depay_sink_template));
gst_element_class_set_static_metadata (gstelement_class,
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"RTP JPEG 2000 depayloader", "Codec/Depayloader/Network/RTP",
"Extracts JPEG 2000 video from RTP packets (RFC 5371)",
"Wim Taymans <wim.taymans@gmail.com>");
gstelement_class->change_state = gst_rtp_j2k_depay_change_state;
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gstrtpbasedepayload_class->set_caps = gst_rtp_j2k_depay_setcaps;
gstrtpbasedepayload_class->process = gst_rtp_j2k_depay_process;
GST_DEBUG_CATEGORY_INIT (rtpj2kdepay_debug, "rtpj2kdepay", 0,
"J2K Video RTP Depayloader");
}
static void
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gst_rtp_j2k_depay_init (GstRtpJ2KDepay * rtpj2kdepay)
{
rtpj2kdepay->pu_adapter = gst_adapter_new ();
rtpj2kdepay->t_adapter = gst_adapter_new ();
rtpj2kdepay->f_adapter = gst_adapter_new ();
}
static void
store_mheader (GstRtpJ2KDepay * rtpj2kdepay, guint idx, GstBuffer * buf)
{
GstBuffer *old;
GST_DEBUG_OBJECT (rtpj2kdepay, "storing main header %p at index %u", buf,
idx);
if ((old = rtpj2kdepay->MH[idx]))
gst_buffer_unref (old);
rtpj2kdepay->MH[idx] = buf;
}
static void
clear_mheaders (GstRtpJ2KDepay * rtpj2kdepay)
{
guint i;
for (i = 0; i < 8; i++)
store_mheader (rtpj2kdepay, i, NULL);
}
static void
gst_rtp_j2k_depay_reset (GstRtpJ2KDepay * rtpj2kdepay)
{
clear_mheaders (rtpj2kdepay);
gst_adapter_clear (rtpj2kdepay->pu_adapter);
gst_adapter_clear (rtpj2kdepay->t_adapter);
gst_adapter_clear (rtpj2kdepay->f_adapter);
rtpj2kdepay->next_frag = 0;
}
static void
gst_rtp_j2k_depay_finalize (GObject * object)
{
GstRtpJ2KDepay *rtpj2kdepay;
rtpj2kdepay = GST_RTP_J2K_DEPAY (object);
clear_mheaders (rtpj2kdepay);
g_object_unref (rtpj2kdepay->pu_adapter);
g_object_unref (rtpj2kdepay->t_adapter);
g_object_unref (rtpj2kdepay->f_adapter);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
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gst_rtp_j2k_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
{
GstStructure *structure;
gint clock_rate;
GstCaps *outcaps;
gboolean res;
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
clock_rate = 90000;
depayload->clock_rate = clock_rate;
outcaps =
gst_caps_new_simple ("image/x-jpc", "framerate", GST_TYPE_FRACTION, 0, 1,
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"fields", G_TYPE_INT, 1, "colorspace", G_TYPE_STRING, "sYUV", NULL);
res = gst_pad_set_caps (depayload->srcpad, outcaps);
gst_caps_unref (outcaps);
return res;
}
static void
gst_rtp_j2k_depay_clear_pu (GstRtpJ2KDepay * rtpj2kdepay)
{
gst_adapter_clear (rtpj2kdepay->pu_adapter);
rtpj2kdepay->have_sync = FALSE;
}
static GstFlowReturn
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gst_rtp_j2k_depay_flush_pu (GstRTPBaseDepayload * depayload)
{
GstRtpJ2KDepay *rtpj2kdepay;
GstBuffer *mheader;
guint avail, MHF, mh_id;
rtpj2kdepay = GST_RTP_J2K_DEPAY (depayload);
/* take all available buffers */
avail = gst_adapter_available (rtpj2kdepay->pu_adapter);
if (avail == 0)
goto done;
MHF = rtpj2kdepay->pu_MHF;
mh_id = rtpj2kdepay->last_mh_id;
GST_DEBUG_OBJECT (rtpj2kdepay, "flushing PU of size %u", avail);
if (MHF == 0) {
GList *packets, *walk;
packets = gst_adapter_take_list (rtpj2kdepay->pu_adapter, avail);
/* append packets */
for (walk = packets; walk; walk = g_list_next (walk)) {
GstBuffer *buf = GST_BUFFER_CAST (walk->data);
GST_DEBUG_OBJECT (rtpj2kdepay,
"append pu packet of size %" G_GSIZE_FORMAT,
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gst_buffer_get_size (buf));
gst_adapter_push (rtpj2kdepay->t_adapter, buf);
}
g_list_free (packets);
} else {
/* we have a header */
GST_DEBUG_OBJECT (rtpj2kdepay, "keeping header %u", mh_id);
/* we managed to see the start and end of the header, take all from
* adapter and keep in header */
mheader = gst_adapter_take_buffer (rtpj2kdepay->pu_adapter, avail);
store_mheader (rtpj2kdepay, mh_id, mheader);
}
done:
rtpj2kdepay->have_sync = FALSE;
return GST_FLOW_OK;
}
static GstFlowReturn
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gst_rtp_j2k_depay_flush_tile (GstRTPBaseDepayload * depayload)
{
GstRtpJ2KDepay *rtpj2kdepay;
guint avail, mh_id;
GList *packets, *walk;
guint8 end[2];
GstFlowReturn ret = GST_FLOW_OK;
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GstMapInfo map;
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GstBuffer *buf;
rtpj2kdepay = GST_RTP_J2K_DEPAY (depayload);
/* flush pending PU */
gst_rtp_j2k_depay_flush_pu (depayload);
/* take all available buffers */
avail = gst_adapter_available (rtpj2kdepay->t_adapter);
if (avail == 0)
goto done;
mh_id = rtpj2kdepay->last_mh_id;
GST_DEBUG_OBJECT (rtpj2kdepay, "flushing tile of size %u", avail);
if (gst_adapter_available (rtpj2kdepay->f_adapter) == 0) {
GstBuffer *mheader;
/* we need a header now */
if ((mheader = rtpj2kdepay->MH[mh_id]) == NULL)
goto waiting_header;
/* push header in the adapter */
GST_DEBUG_OBJECT (rtpj2kdepay, "pushing header %u", mh_id);
gst_adapter_push (rtpj2kdepay->f_adapter, gst_buffer_ref (mheader));
}
/* check for last bytes */
gst_adapter_copy (rtpj2kdepay->t_adapter, end, avail - 2, 2);
/* now append the tile packets to the frame */
packets = gst_adapter_take_list (rtpj2kdepay->t_adapter, avail);
for (walk = packets; walk; walk = g_list_next (walk)) {
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buf = GST_BUFFER_CAST (walk->data);
if (walk == packets) {
/* first buffer should contain the SOT */
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gst_buffer_map (buf, &map, GST_MAP_READ);
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if (map.size < 12)
goto invalid_tile;
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if (map.data[0] == 0xff && map.data[1] == J2K_MARKER_SOT) {
guint Psot, nPsot;
if (end[0] == 0xff && end[1] == J2K_MARKER_EOC)
nPsot = avail - 2;
else
nPsot = avail;
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Psot = GST_READ_UINT32_BE (&map.data[6]);
if (Psot != nPsot && Psot != 0) {
/* Psot must match the size of the tile */
GST_DEBUG_OBJECT (rtpj2kdepay, "set Psot from %u to %u", Psot, nPsot);
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gst_buffer_unmap (buf, &map);
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buf = gst_buffer_make_writable (buf);
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gst_buffer_map (buf, &map, GST_MAP_WRITE);
GST_WRITE_UINT32_BE (&map.data[6], nPsot);
}
}
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gst_buffer_unmap (buf, &map);
}
GST_DEBUG_OBJECT (rtpj2kdepay, "append pu packet of size %" G_GSIZE_FORMAT,
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gst_buffer_get_size (buf));
gst_adapter_push (rtpj2kdepay->f_adapter, buf);
}
g_list_free (packets);
done:
rtpj2kdepay->last_tile = -1;
return ret;
/* errors */
waiting_header:
{
GST_DEBUG_OBJECT (rtpj2kdepay, "waiting for header %u", mh_id);
gst_adapter_clear (rtpj2kdepay->t_adapter);
rtpj2kdepay->last_tile = -1;
return ret;
}
invalid_tile:
{
GST_ELEMENT_WARNING (rtpj2kdepay, STREAM, DECODE, ("Invalid tile"), (NULL));
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gst_buffer_unmap (buf, &map);
gst_adapter_clear (rtpj2kdepay->t_adapter);
rtpj2kdepay->last_tile = -1;
return ret;
}
}
static GstFlowReturn
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gst_rtp_j2k_depay_flush_frame (GstRTPBaseDepayload * depayload)
{
GstRtpJ2KDepay *rtpj2kdepay;
guint8 end[2];
guint avail;
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GstFlowReturn ret = GST_FLOW_OK;
rtpj2kdepay = GST_RTP_J2K_DEPAY (depayload);
/* flush pending tile */
gst_rtp_j2k_depay_flush_tile (depayload);
/* last buffer take all data out of the adapter */
avail = gst_adapter_available (rtpj2kdepay->f_adapter);
if (avail == 0)
goto done;
if (avail > 2) {
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GList *list, *walk;
GstBufferList *buflist;
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/* take the last bytes of the JPEG 2000 data to see if there is an EOC
* marker */
gst_adapter_copy (rtpj2kdepay->f_adapter, end, avail - 2, 2);
if (end[0] != 0xff && end[1] != 0xd9) {
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GstBuffer *outbuf;
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end[0] = 0xff;
end[1] = 0xd9;
GST_DEBUG_OBJECT (rtpj2kdepay, "no EOC marker, adding one");
/* no EOI marker, add one */
outbuf = gst_buffer_new_and_alloc (2);
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gst_buffer_fill (outbuf, 0, end, 2);
gst_adapter_push (rtpj2kdepay->f_adapter, outbuf);
avail += 2;
}
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GST_DEBUG_OBJECT (rtpj2kdepay, "pushing buffer list of %u bytes", avail);
list = gst_adapter_take_list (rtpj2kdepay->f_adapter, avail);
buflist = gst_buffer_list_new ();
for (walk = list; walk; walk = g_list_next (walk))
gst_buffer_list_add (buflist, GST_BUFFER_CAST (walk->data));
g_list_free (list);
ret = gst_rtp_base_depayload_push_list (depayload, buflist);
} else {
GST_WARNING_OBJECT (rtpj2kdepay, "empty packet");
gst_adapter_clear (rtpj2kdepay->f_adapter);
}
/* we accept any mh_id now */
rtpj2kdepay->last_mh_id = -1;
/* reset state */
rtpj2kdepay->next_frag = 0;
rtpj2kdepay->have_sync = FALSE;
done:
/* we can't keep headers with mh_id of 0 */
store_mheader (rtpj2kdepay, 0, NULL);
return ret;
}
static GstBuffer *
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gst_rtp_j2k_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
{
GstRtpJ2KDepay *rtpj2kdepay;
guint8 *payload;
guint MHF, mh_id, frag_offset, tile, payload_len, j2klen;
gint gap;
guint32 rtptime;
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GstRTPBuffer rtp = { NULL };
rtpj2kdepay = GST_RTP_J2K_DEPAY (depayload);
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gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
payload_len = gst_rtp_buffer_get_payload_len (&rtp);
/* we need at least a header */
if (payload_len < 8)
goto empty_packet;
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rtptime = gst_rtp_buffer_get_timestamp (&rtp);
/* new timestamp marks new frame */
if (rtpj2kdepay->last_rtptime != rtptime) {
rtpj2kdepay->last_rtptime = rtptime;
/* flush pending frame */
gst_rtp_j2k_depay_flush_frame (depayload);
}
/*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |tp |MHF|mh_id|T| priority | tile number |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |reserved | fragment offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
MHF = (payload[0] & 0x30) >> 4;
mh_id = (payload[0] & 0xe) >> 1;
if (rtpj2kdepay->last_mh_id == -1)
rtpj2kdepay->last_mh_id = mh_id;
else if (rtpj2kdepay->last_mh_id != mh_id)
goto wrong_mh_id;
tile = (payload[2] << 8) | payload[3];
frag_offset = (payload[5] << 16) | (payload[6] << 8) | payload[7];
j2klen = payload_len - 8;
GST_DEBUG_OBJECT (rtpj2kdepay, "MHF %u, tile %u, frag %u, expected %u", MHF,
tile, frag_offset, rtpj2kdepay->next_frag);
/* calculate the gap between expected frag */
gap = frag_offset - rtpj2kdepay->next_frag;
/* calculate next frag */
rtpj2kdepay->next_frag = frag_offset + j2klen;
if (gap != 0) {
GST_DEBUG_OBJECT (rtpj2kdepay, "discont of %d, clear PU", gap);
/* discont, clear pu adapter and resync */
gst_rtp_j2k_depay_clear_pu (rtpj2kdepay);
}
/* check for sync code */
if (j2klen > 2 && payload[8] == 0xff) {
guint marker = payload[9];
/* packets must start with SOC, SOT or SOP */
switch (marker) {
case J2K_MARKER_SOC:
GST_DEBUG_OBJECT (rtpj2kdepay, "found SOC packet");
/* flush the previous frame, should have happened when the timestamp
* changed above. */
gst_rtp_j2k_depay_flush_frame (depayload);
rtpj2kdepay->have_sync = TRUE;
break;
case J2K_MARKER_SOT:
/* flush the previous tile */
gst_rtp_j2k_depay_flush_tile (depayload);
GST_DEBUG_OBJECT (rtpj2kdepay, "found SOT packet");
rtpj2kdepay->have_sync = TRUE;
/* we sync on the tile now */
rtpj2kdepay->last_tile = tile;
break;
case J2K_MARKER_SOP:
GST_DEBUG_OBJECT (rtpj2kdepay, "found SOP packet");
/* flush the previous PU */
gst_rtp_j2k_depay_flush_pu (depayload);
if (rtpj2kdepay->last_tile != tile) {
/* wrong tile, we lose sync and we need a new SOT or SOC to regain
* sync. First flush out the previous tile if we have one. */
if (rtpj2kdepay->last_tile != -1)
gst_rtp_j2k_depay_flush_tile (depayload);
/* now we have no more valid tile and no sync */
rtpj2kdepay->last_tile = -1;
rtpj2kdepay->have_sync = FALSE;
} else {
rtpj2kdepay->have_sync = TRUE;
}
break;
default:
GST_DEBUG_OBJECT (rtpj2kdepay, "no sync packet 0x%02d", marker);
break;
}
}
if (rtpj2kdepay->have_sync) {
GstBuffer *pu_frag;
if (gst_adapter_available (rtpj2kdepay->pu_adapter) == 0) {
/* first part of pu, record state */
GST_DEBUG_OBJECT (rtpj2kdepay, "first PU");
rtpj2kdepay->pu_MHF = MHF;
}
/* and push in pu adapter */
GST_DEBUG_OBJECT (rtpj2kdepay, "push pu of size %u in adapter", j2klen);
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pu_frag = gst_rtp_buffer_get_payload_subbuffer (&rtp, 8, -1);
gst_adapter_push (rtpj2kdepay->pu_adapter, pu_frag);
if (MHF & 2) {
/* last part of main header received, we can flush it */
GST_DEBUG_OBJECT (rtpj2kdepay, "header end, flush pu");
gst_rtp_j2k_depay_flush_pu (depayload);
}
} else {
GST_DEBUG_OBJECT (rtpj2kdepay, "discard packet, no sync");
}
/* marker bit finishes the frame */
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if (gst_rtp_buffer_get_marker (&rtp)) {
GST_DEBUG_OBJECT (rtpj2kdepay, "marker set, last buffer");
/* then flush frame */
gst_rtp_j2k_depay_flush_frame (depayload);
}
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gst_rtp_buffer_unmap (&rtp);
return NULL;
/* ERRORS */
empty_packet:
{
GST_ELEMENT_WARNING (rtpj2kdepay, STREAM, DECODE,
("Empty Payload."), (NULL));
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gst_rtp_buffer_unmap (&rtp);
return NULL;
}
wrong_mh_id:
{
GST_ELEMENT_WARNING (rtpj2kdepay, STREAM, DECODE,
("Invalid mh_id %u, expected %u", mh_id, rtpj2kdepay->last_mh_id),
(NULL));
gst_rtp_j2k_depay_clear_pu (rtpj2kdepay);
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gst_rtp_buffer_unmap (&rtp);
return NULL;
}
}
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static void
gst_rtp_j2k_depay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_j2k_depay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_rtp_j2k_depay_change_state (GstElement * element, GstStateChange transition)
{
GstRtpJ2KDepay *rtpj2kdepay;
GstStateChangeReturn ret;
rtpj2kdepay = GST_RTP_J2K_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rtp_j2k_depay_reset (rtpj2kdepay);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_rtp_j2k_depay_reset (rtpj2kdepay);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
gboolean
gst_rtp_j2k_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpj2kdepay",
GST_RANK_SECONDARY, GST_TYPE_RTP_J2K_DEPAY);
}