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gstreamer/gst/rtp/gstrtptheorapay.c
Stéphane Cerveau 80f8780e92 rtp: allow per feature registration 
Split plugin into features including
dynamic types which can be indiviually
registered during a static build.

More details here:

https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/199
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/661

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/876>
2021-03-29 12:45:22 +02:00

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/* GStreamer
* Copyright (C) <2006> 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 <gst/video/video.h>
#include "gstrtpelements.h"
#include "fnv1hash.h"
#include "gstrtptheorapay.h"
#include "gstrtputils.h"
#define THEORA_ID_LEN 42
GST_DEBUG_CATEGORY_STATIC (rtptheorapay_debug);
#define GST_CAT_DEFAULT (rtptheorapay_debug)
/* references:
* http://svn.xiph.org/trunk/theora/doc/draft-ietf-avt-rtp-theora-01.txt
*/
static GstStaticPadTemplate gst_rtp_theora_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) \"THEORA\""
/* All required parameters
*
* "sampling = (string) { "YCbCr-4:2:0", "YCbCr-4:2:2", "YCbCr-4:4:4" } "
* "width = (string) [1, 1048561] (multiples of 16) "
* "height = (string) [1, 1048561] (multiples of 16) "
* "configuration = (string) ANY"
*/
/* All optional parameters
*
* "configuration-uri ="
* "delivery-method = (string) { inline, in_band, out_band/<specific_name> } "
*/
)
);
static GstStaticPadTemplate gst_rtp_theora_pay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-theora")
);
#define DEFAULT_CONFIG_INTERVAL 0
enum
{
PROP_0,
PROP_CONFIG_INTERVAL
};
#define gst_rtp_theora_pay_parent_class parent_class
G_DEFINE_TYPE (GstRtpTheoraPay, gst_rtp_theora_pay, GST_TYPE_RTP_BASE_PAYLOAD);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtptheorapay, "rtptheorapay",
GST_RANK_SECONDARY, GST_TYPE_RTP_THEORA_PAY, rtp_element_init (plugin));
static gboolean gst_rtp_theora_pay_setcaps (GstRTPBasePayload * basepayload,
GstCaps * caps);
static GstStateChangeReturn gst_rtp_theora_pay_change_state (GstElement *
element, GstStateChange transition);
static GstFlowReturn gst_rtp_theora_pay_handle_buffer (GstRTPBasePayload * pad,
GstBuffer * buffer);
static gboolean gst_rtp_theora_pay_sink_event (GstRTPBasePayload * payload,
GstEvent * event);
static gboolean gst_rtp_theora_pay_parse_id (GstRTPBasePayload * basepayload,
guint8 * data, guint size);
static gboolean gst_rtp_theora_pay_finish_headers (GstRTPBasePayload *
basepayload);
static void gst_rtp_theora_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_theora_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
gst_rtp_theora_pay_class_init (GstRtpTheoraPayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBasePayloadClass *gstrtpbasepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;
gstelement_class->change_state = gst_rtp_theora_pay_change_state;
gstrtpbasepayload_class->set_caps = gst_rtp_theora_pay_setcaps;
gstrtpbasepayload_class->handle_buffer = gst_rtp_theora_pay_handle_buffer;
gstrtpbasepayload_class->sink_event = gst_rtp_theora_pay_sink_event;
gobject_class->set_property = gst_rtp_theora_pay_set_property;
gobject_class->get_property = gst_rtp_theora_pay_get_property;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_theora_pay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_theora_pay_sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"RTP Theora payloader", "Codec/Payloader/Network/RTP",
"Payload-encode Theora video into RTP packets (draft-01 RFC XXXX)",
"Wim Taymans <wim.taymans@gmail.com>");
GST_DEBUG_CATEGORY_INIT (rtptheorapay_debug, "rtptheorapay", 0,
"Theora RTP Payloader");
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_CONFIG_INTERVAL,
g_param_spec_uint ("config-interval", "Config Send Interval",
"Send Config Insertion Interval in seconds (configuration headers "
"will be multiplexed in the data stream when detected.) (0 = disabled)",
0, 3600, DEFAULT_CONFIG_INTERVAL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)
);
}
static void
gst_rtp_theora_pay_init (GstRtpTheoraPay * rtptheorapay)
{
rtptheorapay->last_config = GST_CLOCK_TIME_NONE;
}
static void
gst_rtp_theora_pay_clear_packet (GstRtpTheoraPay * rtptheorapay)
{
if (rtptheorapay->packet)
gst_buffer_unref (rtptheorapay->packet);
rtptheorapay->packet = NULL;
g_list_free_full (rtptheorapay->packet_buffers,
(GDestroyNotify) gst_buffer_unref);
rtptheorapay->packet_buffers = NULL;
}
static void
gst_rtp_theora_pay_cleanup (GstRtpTheoraPay * rtptheorapay)
{
gst_rtp_theora_pay_clear_packet (rtptheorapay);
g_list_free_full (rtptheorapay->headers, (GDestroyNotify) gst_buffer_unref);
rtptheorapay->headers = NULL;
g_free (rtptheorapay->config_data);
rtptheorapay->config_data = NULL;
rtptheorapay->last_config = GST_CLOCK_TIME_NONE;
}
static gboolean
gst_rtp_theora_pay_setcaps (GstRTPBasePayload * basepayload, GstCaps * caps)
{
GstRtpTheoraPay *rtptheorapay;
GstStructure *s;
const GValue *array;
gint asize, i;
GstBuffer *buf;
GstMapInfo map;
rtptheorapay = GST_RTP_THEORA_PAY (basepayload);
s = gst_caps_get_structure (caps, 0);
rtptheorapay->need_headers = TRUE;
if ((array = gst_structure_get_value (s, "streamheader")) == NULL)
goto done;
if (G_VALUE_TYPE (array) != GST_TYPE_ARRAY)
goto done;
if ((asize = gst_value_array_get_size (array)) < 3)
goto done;
for (i = 0; i < asize; i++) {
const GValue *value;
value = gst_value_array_get_value (array, i);
if ((buf = gst_value_get_buffer (value)) == NULL)
goto null_buffer;
gst_buffer_map (buf, &map, GST_MAP_READ);
/* no data packets allowed */
if (map.size < 1)
goto invalid_streamheader;
/* we need packets with id 0x80, 0x81, 0x82 */
if (map.data[0] != 0x80 + i)
goto invalid_streamheader;
if (i == 0) {
/* identification, we need to parse this in order to get the clock rate. */
if (G_UNLIKELY (!gst_rtp_theora_pay_parse_id (basepayload, map.data,
map.size)))
goto parse_id_failed;
}
GST_DEBUG_OBJECT (rtptheorapay, "collecting header %d", i);
rtptheorapay->headers =
g_list_append (rtptheorapay->headers, gst_buffer_ref (buf));
gst_buffer_unmap (buf, &map);
}
if (!gst_rtp_theora_pay_finish_headers (basepayload))
goto finish_failed;
done:
return TRUE;
/* ERRORS */
null_buffer:
{
GST_WARNING_OBJECT (rtptheorapay, "streamheader with null buffer received");
return FALSE;
}
invalid_streamheader:
{
GST_WARNING_OBJECT (rtptheorapay, "unable to parse initial header");
gst_buffer_unmap (buf, &map);
return FALSE;
}
parse_id_failed:
{
GST_WARNING_OBJECT (rtptheorapay, "unable to parse initial header");
gst_buffer_unmap (buf, &map);
return FALSE;
}
finish_failed:
{
GST_WARNING_OBJECT (rtptheorapay, "unable to finish headers");
return FALSE;
}
}
static void
gst_rtp_theora_pay_reset_packet (GstRtpTheoraPay * rtptheorapay, guint8 TDT)
{
guint payload_len;
GstRTPBuffer rtp = { NULL };
GST_DEBUG_OBJECT (rtptheorapay, "reset packet");
rtptheorapay->payload_pos = 4;
gst_rtp_buffer_map (rtptheorapay->packet, GST_MAP_READ, &rtp);
payload_len = gst_rtp_buffer_get_payload_len (&rtp);
gst_rtp_buffer_unmap (&rtp);
rtptheorapay->payload_left = payload_len - 4;
rtptheorapay->payload_duration = 0;
rtptheorapay->payload_F = 0;
rtptheorapay->payload_TDT = TDT;
rtptheorapay->payload_pkts = 0;
}
static void
gst_rtp_theora_pay_init_packet (GstRtpTheoraPay * rtptheorapay, guint8 TDT,
GstClockTime timestamp)
{
GST_DEBUG_OBJECT (rtptheorapay, "starting new packet, TDT: %d", TDT);
gst_rtp_theora_pay_clear_packet (rtptheorapay);
/* new packet allocate max packet size */
rtptheorapay->packet =
gst_rtp_base_payload_allocate_output_buffer (GST_RTP_BASE_PAYLOAD
(rtptheorapay), GST_RTP_BASE_PAYLOAD_MTU (rtptheorapay), 0, 0);
gst_rtp_theora_pay_reset_packet (rtptheorapay, TDT);
GST_BUFFER_PTS (rtptheorapay->packet) = timestamp;
}
static GstFlowReturn
gst_rtp_theora_pay_flush_packet (GstRtpTheoraPay * rtptheorapay)
{
GstFlowReturn ret;
guint8 *payload;
guint hlen;
GstRTPBuffer rtp = { NULL };
GList *l;
/* check for empty packet */
if (!rtptheorapay->packet || rtptheorapay->payload_pos <= 4)
return GST_FLOW_OK;
GST_DEBUG_OBJECT (rtptheorapay, "flushing packet");
gst_rtp_buffer_map (rtptheorapay->packet, GST_MAP_WRITE, &rtp);
/* fix header */
payload = gst_rtp_buffer_get_payload (&rtp);
/*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Ident | F |TDT|# pkts.|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* F: Fragment type (0=none, 1=start, 2=cont, 3=end)
* TDT: Theora data type (0=theora, 1=config, 2=comment, 3=reserved)
* pkts: number of packets.
*/
payload[0] = (rtptheorapay->payload_ident >> 16) & 0xff;
payload[1] = (rtptheorapay->payload_ident >> 8) & 0xff;
payload[2] = (rtptheorapay->payload_ident) & 0xff;
payload[3] = (rtptheorapay->payload_F & 0x3) << 6 |
(rtptheorapay->payload_TDT & 0x3) << 4 |
(rtptheorapay->payload_pkts & 0xf);
gst_rtp_buffer_unmap (&rtp);
/* shrink the buffer size to the last written byte */
hlen = gst_rtp_buffer_calc_header_len (0);
gst_buffer_resize (rtptheorapay->packet, 0, hlen + rtptheorapay->payload_pos);
GST_BUFFER_DURATION (rtptheorapay->packet) = rtptheorapay->payload_duration;
for (l = g_list_last (rtptheorapay->packet_buffers); l; l = l->prev) {
GstBuffer *buf = GST_BUFFER_CAST (l->data);
gst_rtp_copy_video_meta (rtptheorapay, rtptheorapay->packet, buf);
gst_buffer_unref (buf);
}
g_list_free (rtptheorapay->packet_buffers);
rtptheorapay->packet_buffers = NULL;
/* push, this gives away our ref to the packet, so clear it. */
ret =
gst_rtp_base_payload_push (GST_RTP_BASE_PAYLOAD (rtptheorapay),
rtptheorapay->packet);
rtptheorapay->packet = NULL;
return ret;
}
static gboolean
gst_rtp_theora_pay_finish_headers (GstRTPBasePayload * basepayload)
{
GstRtpTheoraPay *rtptheorapay = GST_RTP_THEORA_PAY (basepayload);
GList *walk;
guint length, size, n_headers, configlen, extralen;
gchar *wstr, *hstr, *configuration;
guint8 *data, *config;
guint32 ident;
gboolean res;
const gchar *sampling = NULL;
GST_DEBUG_OBJECT (rtptheorapay, "finish headers");
if (!rtptheorapay->headers) {
GST_DEBUG_OBJECT (rtptheorapay, "We need 2 headers but have none");
goto no_headers;
}
/* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Number of packed headers |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Packed header |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Packed header |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | .... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* We only construct a config containing 1 packed header like this:
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Ident | length ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. | n. of headers | length1 | length2 ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. | Identification Header ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .................................................................
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. | Comment Header ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .................................................................
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. Comment Header |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Setup Header ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .................................................................
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. Setup Header |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/* we need 4 bytes for the number of headers (which is always 1), 3 bytes for
* the ident, 2 bytes for length, 1 byte for n. of headers. */
size = 4 + 3 + 2 + 1;
/* count the size of the headers first and update the hash */
length = 0;
n_headers = 0;
ident = fnv1_hash_32_new ();
extralen = 1;
for (walk = rtptheorapay->headers; walk; walk = g_list_next (walk)) {
GstBuffer *buf = GST_BUFFER_CAST (walk->data);
GstMapInfo map;
guint bsize;
bsize = gst_buffer_get_size (buf);
length += bsize;
n_headers++;
/* count number of bytes needed for length fields, we don't need this for
* the last header. */
if (g_list_next (walk)) {
do {
size++;
extralen++;
bsize >>= 7;
} while (bsize);
}
/* update hash */
gst_buffer_map (buf, &map, GST_MAP_READ);
ident = fnv1_hash_32_update (ident, map.data, map.size);
gst_buffer_unmap (buf, &map);
}
/* packet length is header size + packet length */
configlen = size + length;
config = data = g_malloc (configlen);
/* number of packed headers, we only pack 1 header */
data[0] = 0;
data[1] = 0;
data[2] = 0;
data[3] = 1;
ident = fnv1_hash_32_to_24 (ident);
rtptheorapay->payload_ident = ident;
GST_DEBUG_OBJECT (rtptheorapay, "ident 0x%08x", ident);
/* take lower 3 bytes */
data[4] = (ident >> 16) & 0xff;
data[5] = (ident >> 8) & 0xff;
data[6] = ident & 0xff;
/* store length of all theora headers */
data[7] = ((length) >> 8) & 0xff;
data[8] = (length) & 0xff;
/* store number of headers minus one. */
data[9] = n_headers - 1;
data += 10;
/* store length for each header */
for (walk = rtptheorapay->headers; walk; walk = g_list_next (walk)) {
GstBuffer *buf = GST_BUFFER_CAST (walk->data);
guint bsize, size, temp;
guint flag;
/* only need to store the length when it's not the last header */
if (!g_list_next (walk))
break;
bsize = gst_buffer_get_size (buf);
/* calc size */
size = 0;
do {
size++;
bsize >>= 7;
} while (bsize);
temp = size;
bsize = gst_buffer_get_size (buf);
/* write the size backwards */
flag = 0;
while (size) {
size--;
data[size] = (bsize & 0x7f) | flag;
bsize >>= 7;
flag = 0x80; /* Flag bit on all bytes of the length except the last */
}
data += temp;
}
/* copy header data */
for (walk = rtptheorapay->headers; walk; walk = g_list_next (walk)) {
GstBuffer *buf = GST_BUFFER_CAST (walk->data);
gst_buffer_extract (buf, 0, data, gst_buffer_get_size (buf));
data += gst_buffer_get_size (buf);
}
rtptheorapay->need_headers = FALSE;
/* serialize to base64 */
configuration = g_base64_encode (config, configlen);
/* store for later re-sending */
g_free (rtptheorapay->config_data);
rtptheorapay->config_size = configlen - 4 - 3 - 2;
rtptheorapay->config_data = g_malloc (rtptheorapay->config_size);
rtptheorapay->config_extra_len = extralen;
memcpy (rtptheorapay->config_data, config + 4 + 3 + 2,
rtptheorapay->config_size);
g_free (config);
/* configure payloader settings */
switch (rtptheorapay->pixel_format) {
case 2:
sampling = "YCbCr-4:2:2";
break;
case 3:
sampling = "YCbCr-4:4:4";
break;
case 0:
default:
sampling = "YCbCr-4:2:0";
break;
}
wstr = g_strdup_printf ("%d", rtptheorapay->width);
hstr = g_strdup_printf ("%d", rtptheorapay->height);
gst_rtp_base_payload_set_options (basepayload, "video", TRUE, "THEORA",
90000);
res =
gst_rtp_base_payload_set_outcaps (basepayload, "sampling", G_TYPE_STRING,
sampling, "width", G_TYPE_STRING, wstr, "height", G_TYPE_STRING,
hstr, "configuration", G_TYPE_STRING, configuration, "delivery-method",
G_TYPE_STRING, "inline",
/* don't set the other defaults
*/
NULL);
g_free (wstr);
g_free (hstr);
g_free (configuration);
return res;
/* ERRORS */
no_headers:
{
GST_DEBUG_OBJECT (rtptheorapay, "finish headers");
return FALSE;
}
}
static gboolean
gst_rtp_theora_pay_parse_id (GstRTPBasePayload * basepayload, guint8 * data,
guint size)
{
GstRtpTheoraPay *rtptheorapay;
gint width, height, pixel_format;
rtptheorapay = GST_RTP_THEORA_PAY (basepayload);
if (G_UNLIKELY (size < 42))
goto too_short;
if (G_UNLIKELY (memcmp (data, "\200theora", 7)))
goto invalid_start;
data += 7;
if (G_UNLIKELY (data[0] != 3))
goto invalid_version;
if (G_UNLIKELY (data[1] != 2))
goto invalid_version;
data += 3;
width = GST_READ_UINT16_BE (data) << 4;
data += 2;
height = GST_READ_UINT16_BE (data) << 4;
data += 29;
pixel_format = (GST_READ_UINT8 (data) >> 3) & 0x03;
/* store values */
rtptheorapay->pixel_format = pixel_format;
rtptheorapay->width = width;
rtptheorapay->height = height;
return TRUE;
/* ERRORS */
too_short:
{
GST_ELEMENT_ERROR (basepayload, STREAM, DECODE,
(NULL),
("Identification packet is too short, need at least 42, got %d", size));
return FALSE;
}
invalid_start:
{
GST_ELEMENT_ERROR (basepayload, STREAM, DECODE,
(NULL), ("Invalid header start in identification packet"));
return FALSE;
}
invalid_version:
{
GST_ELEMENT_ERROR (basepayload, STREAM, DECODE,
(NULL), ("Invalid version"));
return FALSE;
}
}
static GstFlowReturn
gst_rtp_theora_pay_payload_buffer (GstRtpTheoraPay * rtptheorapay, guint8 TDT,
GstBuffer * buffer, guint8 * data, guint size, GstClockTime timestamp,
GstClockTime duration, guint not_in_length)
{
GstFlowReturn ret = GST_FLOW_OK;
guint newsize;
guint packet_len;
GstClockTime newduration;
gboolean flush;
guint plen;
guint8 *ppos, *payload;
gboolean fragmented;
GstRTPBuffer rtp = { NULL };
/* size increases with packet length and 2 bytes size eader. */
newduration = rtptheorapay->payload_duration;
if (duration != GST_CLOCK_TIME_NONE)
newduration += duration;
newsize = rtptheorapay->payload_pos + 2 + size;
packet_len = gst_rtp_buffer_calc_packet_len (newsize, 0, 0);
/* check buffer filled against length and max latency */
flush = gst_rtp_base_payload_is_filled (GST_RTP_BASE_PAYLOAD (rtptheorapay),
packet_len, newduration);
/* we can store up to 15 theora packets in one RTP packet. */
flush |= (rtptheorapay->payload_pkts == 15);
/* flush if we have a new TDT */
if (rtptheorapay->packet)
flush |= (rtptheorapay->payload_TDT != TDT);
if (flush)
ret = gst_rtp_theora_pay_flush_packet (rtptheorapay);
if (ret != GST_FLOW_OK)
goto done;
/* create new packet if we must */
if (!rtptheorapay->packet) {
gst_rtp_theora_pay_init_packet (rtptheorapay, TDT, timestamp);
}
gst_rtp_buffer_map (rtptheorapay->packet, GST_MAP_WRITE, &rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
ppos = payload + rtptheorapay->payload_pos;
fragmented = FALSE;
/* put buffer in packet, it either fits completely or needs to be fragmented
* over multiple RTP packets. */
do {
plen = MIN (rtptheorapay->payload_left - 2, size);
GST_DEBUG_OBJECT (rtptheorapay, "append %u bytes", plen);
/* data is copied in the payload with a 2 byte length header */
ppos[0] = ((plen - not_in_length) >> 8) & 0xff;
ppos[1] = ((plen - not_in_length) & 0xff);
if (plen)
memcpy (&ppos[2], data, plen);
if (buffer) {
if (!rtptheorapay->packet_buffers
|| rtptheorapay->packet_buffers->data != (gpointer) buffer)
rtptheorapay->packet_buffers =
g_list_prepend (rtptheorapay->packet_buffers,
gst_buffer_ref (buffer));
} else {
GList *l;
for (l = rtptheorapay->headers; l; l = l->next)
rtptheorapay->packet_buffers =
g_list_prepend (rtptheorapay->packet_buffers,
gst_buffer_ref (l->data));
}
/* only first (only) configuration cuts length field */
/* NOTE: spec (if any) is not clear on this ... */
not_in_length = 0;
size -= plen;
data += plen;
rtptheorapay->payload_pos += plen + 2;
rtptheorapay->payload_left -= plen + 2;
if (fragmented) {
if (size == 0)
/* last fragment, set F to 0x3. */
rtptheorapay->payload_F = 0x3;
else
/* fragment continues, set F to 0x2. */
rtptheorapay->payload_F = 0x2;
} else {
if (size > 0) {
/* fragmented packet starts, set F to 0x1, mark ourselves as
* fragmented. */
rtptheorapay->payload_F = 0x1;
fragmented = TRUE;
}
}
if (fragmented) {
gst_rtp_buffer_unmap (&rtp);
/* fragmented packets are always flushed and have ptks of 0 */
rtptheorapay->payload_pkts = 0;
ret = gst_rtp_theora_pay_flush_packet (rtptheorapay);
if (size > 0) {
/* start new packet and get pointers. TDT stays the same. */
gst_rtp_theora_pay_init_packet (rtptheorapay,
rtptheorapay->payload_TDT, timestamp);
gst_rtp_buffer_map (rtptheorapay->packet, GST_MAP_WRITE, &rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
ppos = payload + rtptheorapay->payload_pos;
}
} else {
/* unfragmented packet, update stats for next packet, size == 0 and we
* exit the while loop */
rtptheorapay->payload_pkts++;
if (duration != GST_CLOCK_TIME_NONE)
rtptheorapay->payload_duration += duration;
}
} while (size && ret == GST_FLOW_OK);
if (rtp.buffer)
gst_rtp_buffer_unmap (&rtp);
done:
return ret;
}
static GstFlowReturn
gst_rtp_theora_pay_handle_buffer (GstRTPBasePayload * basepayload,
GstBuffer * buffer)
{
GstRtpTheoraPay *rtptheorapay;
GstFlowReturn ret;
GstMapInfo map;
gsize size;
guint8 *data;
GstClockTime duration, timestamp;
guint8 TDT;
gboolean keyframe = FALSE;
rtptheorapay = GST_RTP_THEORA_PAY (basepayload);
gst_buffer_map (buffer, &map, GST_MAP_READ);
data = map.data;
size = map.size;
duration = GST_BUFFER_DURATION (buffer);
timestamp = GST_BUFFER_PTS (buffer);
GST_DEBUG_OBJECT (rtptheorapay, "size %" G_GSIZE_FORMAT
", duration %" GST_TIME_FORMAT, size, GST_TIME_ARGS (duration));
/* find packet type */
if (size == 0) {
TDT = 0;
keyframe = FALSE;
} else if (data[0] & 0x80) {
/* header */
if (data[0] == 0x80) {
/* identification, we need to parse this in order to get the clock rate.
*/
if (G_UNLIKELY (!gst_rtp_theora_pay_parse_id (basepayload, data, size)))
goto parse_id_failed;
TDT = 1;
} else if (data[0] == 0x81) {
/* comment */
TDT = 2;
} else if (data[0] == 0x82) {
/* setup */
TDT = 1;
} else
goto unknown_header;
} else {
/* data */
TDT = 0;
keyframe = ((data[0] & 0x40) == 0);
}
/* we need to collect the headers and construct a config string from them */
if (TDT != 0) {
GST_DEBUG_OBJECT (rtptheorapay, "collecting header, buffer %p", buffer);
/* append header to the list of headers */
gst_buffer_unmap (buffer, &map);
rtptheorapay->headers = g_list_append (rtptheorapay->headers, buffer);
ret = GST_FLOW_OK;
goto done;
} else if (rtptheorapay->headers && rtptheorapay->need_headers) {
if (!gst_rtp_theora_pay_finish_headers (basepayload))
goto header_error;
}
/* there is a config request, see if we need to insert it */
if (keyframe && (rtptheorapay->config_interval > 0) &&
rtptheorapay->config_data) {
gboolean send_config = FALSE;
GstClockTime running_time =
gst_segment_to_running_time (&basepayload->segment, GST_FORMAT_TIME,
timestamp);
if (rtptheorapay->last_config != -1) {
guint64 diff;
GST_LOG_OBJECT (rtptheorapay,
"now %" GST_TIME_FORMAT ", last VOP-I %" GST_TIME_FORMAT,
GST_TIME_ARGS (running_time),
GST_TIME_ARGS (rtptheorapay->last_config));
/* calculate diff between last config in milliseconds */
if (running_time > rtptheorapay->last_config) {
diff = running_time - rtptheorapay->last_config;
} else {
diff = 0;
}
GST_DEBUG_OBJECT (rtptheorapay,
"interval since last config %" GST_TIME_FORMAT, GST_TIME_ARGS (diff));
/* bigger than interval, queue config */
if (GST_TIME_AS_SECONDS (diff) >= rtptheorapay->config_interval) {
GST_DEBUG_OBJECT (rtptheorapay, "time to send config");
send_config = TRUE;
}
} else {
/* no known previous config time, send now */
GST_DEBUG_OBJECT (rtptheorapay, "no previous config time, send now");
send_config = TRUE;
}
if (send_config) {
/* we need to send config now first */
/* different TDT type forces flush */
gst_rtp_theora_pay_payload_buffer (rtptheorapay, 1,
NULL, rtptheorapay->config_data, rtptheorapay->config_size,
timestamp, GST_CLOCK_TIME_NONE, rtptheorapay->config_extra_len);
if (running_time != -1) {
rtptheorapay->last_config = running_time;
}
}
}
ret =
gst_rtp_theora_pay_payload_buffer (rtptheorapay, TDT, buffer, data, size,
timestamp, duration, 0);
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
done:
return ret;
/* ERRORS */
parse_id_failed:
{
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
}
unknown_header:
{
GST_ELEMENT_WARNING (rtptheorapay, STREAM, DECODE,
(NULL), ("Ignoring unknown header received"));
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
header_error:
{
GST_ELEMENT_WARNING (rtptheorapay, STREAM, DECODE,
(NULL), ("Error initializing header config"));
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
}
static gboolean
gst_rtp_theora_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
{
GstRtpTheoraPay *rtptheorapay = GST_RTP_THEORA_PAY (payload);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_rtp_theora_pay_clear_packet (rtptheorapay);
break;
default:
break;
}
/* false to let parent handle event as well */
return GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload, event);
}
static GstStateChangeReturn
gst_rtp_theora_pay_change_state (GstElement * element,
GstStateChange transition)
{
GstRtpTheoraPay *rtptheorapay;
GstStateChangeReturn ret;
rtptheorapay = GST_RTP_THEORA_PAY (element);
switch (transition) {
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_rtp_theora_pay_cleanup (rtptheorapay);
break;
default:
break;
}
return ret;
}
static void
gst_rtp_theora_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpTheoraPay *rtptheorapay;
rtptheorapay = GST_RTP_THEORA_PAY (object);
switch (prop_id) {
case PROP_CONFIG_INTERVAL:
rtptheorapay->config_interval = g_value_get_uint (value);
break;
default:
break;
}
}
static void
gst_rtp_theora_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRtpTheoraPay *rtptheorapay;
rtptheorapay = GST_RTP_THEORA_PAY (object);
switch (prop_id) {
case PROP_CONFIG_INTERVAL:
g_value_set_uint (value, rtptheorapay->config_interval);
break;
default:
break;
}
}
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