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gstreamer/gst/rtp/gstrtph264pay.c
Tim-Philipp Müller b4115aa83e rtp: Fix compiler warning in h264 payloader 
Fix an undefined behaviour warning from gcc 4.4.0

Patch By: Tim-Philipp Müller <tim.muller@collabora.co.uk>
Fixes: #570995
Signed-Off-By: Jan Schmidt <jan.schmidt@sun.com>
2009-02-24 17:59:29 +00:00

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/* GStreamer
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtph264pay.h"
#define SPS_TYPE_ID 7
#define PPS_TYPE_ID 8
#define USE_MEMCMP
GST_DEBUG_CATEGORY_STATIC (rtph264pay_debug);
#define GST_CAT_DEFAULT (rtph264pay_debug)
/* references:
*
* RFC 3984
*/
/* elementfactory information */
static const GstElementDetails gst_rtp_h264pay_details =
GST_ELEMENT_DETAILS ("RTP H264 payloader",
"Codec/Payloader/Network",
"Payload-encode H264 video into RTP packets (RFC 3984)",
"Laurent Glayal <spglegle@yahoo.fr>");
static GstStaticPadTemplate gst_rtp_h264_pay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264")
);
static GstStaticPadTemplate gst_rtp_h264_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) \"H264\"")
);
#define GST_TYPE_H264_SCAN_MODE (gst_h264_scan_mode_get_type())
static GType
gst_h264_scan_mode_get_type (void)
{
static GType h264_scan_mode_type = 0;
static const GEnumValue h264_scan_modes[] = {
{GST_H264_SCAN_MODE_BYTESTREAM,
"Scan complete bytestream for NALUs (not implemented)",
"bytestream"},
{GST_H264_SCAN_MODE_MULTI_NAL, "Buffers contain multiple complete NALUs",
"multiple"},
{GST_H264_SCAN_MODE_SINGLE_NAL, "Buffers contain a single complete NALU",
"single"},
{0, NULL, NULL},
};
if (!h264_scan_mode_type) {
h264_scan_mode_type =
g_enum_register_static ("GstH264PayScanMode", h264_scan_modes);
}
return h264_scan_mode_type;
}
#define DEFAULT_PROFILE_LEVEL_ID NULL
#define DEFAULT_SPROP_PARAMETER_SETS NULL
#define DEFAULT_SCAN_MODE GST_H264_SCAN_MODE_MULTI_NAL
enum
{
PROP_0,
PROP_PROFILE_LEVEL_ID,
PROP_SPROP_PARAMETER_SETS,
PROP_SCAN_MODE,
PROP_LAST
};
#define IS_ACCESS_UNIT(x) (((x) > 0x00) && ((x) < 0x06))
static void gst_rtp_h264_pay_finalize (GObject * object);
static GstStateChangeReturn gst_rtp_h264_pay_change_state (GstElement * element,
GstStateChange transition);
static void gst_rtp_h264_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_h264_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_rtp_h264_pay_setcaps (GstBaseRTPPayload * basepayload,
GstCaps * caps);
static GstFlowReturn gst_rtp_h264_pay_handle_buffer (GstBaseRTPPayload * pad,
GstBuffer * buffer);
GST_BOILERPLATE (GstRtpH264Pay, gst_rtp_h264_pay, GstBaseRTPPayload,
GST_TYPE_BASE_RTP_PAYLOAD);
static void
gst_rtp_h264_pay_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_h264_pay_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_h264_pay_sink_template));
gst_element_class_set_details (element_class, &gst_rtp_h264pay_details);
}
static void
gst_rtp_h264_pay_class_init (GstRtpH264PayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseRTPPayloadClass *gstbasertppayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
gobject_class->set_property = gst_rtp_h264_pay_set_property;
gobject_class->get_property = gst_rtp_h264_pay_get_property;
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_PROFILE_LEVEL_ID, g_param_spec_string ("profile-level-id",
"profile-level-id",
"The base64 profile-level-id to set in out caps (set to NULL to "
"extract from stream)",
DEFAULT_PROFILE_LEVEL_ID,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_SPROP_PARAMETER_SETS, g_param_spec_string ("sprop-parameter-sets",
"sprop-parameter-sets",
"The base64 sprop-parameter-sets to set in out caps (set to NULL to "
"extract from stream)",
DEFAULT_SPROP_PARAMETER_SETS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SCAN_MODE,
g_param_spec_enum ("scan-mode", "Scan Mode",
"How to scan the input buffers for NAL units. Performance can be "
"increased when certain assumptions are made about the input buffers",
GST_TYPE_H264_SCAN_MODE, DEFAULT_SCAN_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gobject_class->finalize = gst_rtp_h264_pay_finalize;
gstelement_class->change_state = gst_rtp_h264_pay_change_state;
gstbasertppayload_class->set_caps = gst_rtp_h264_pay_setcaps;
gstbasertppayload_class->handle_buffer = gst_rtp_h264_pay_handle_buffer;
GST_DEBUG_CATEGORY_INIT (rtph264pay_debug, "rtph264pay", 0,
"H264 RTP Payloader");
}
static void
gst_rtp_h264_pay_init (GstRtpH264Pay * rtph264pay, GstRtpH264PayClass * klass)
{
rtph264pay->profile = 0;
rtph264pay->sps = NULL;
rtph264pay->pps = NULL;
rtph264pay->scan_mode = GST_H264_SCAN_MODE_MULTI_NAL;
}
static void
gst_rtp_h264_pay_finalize (GObject * object)
{
GstRtpH264Pay *rtph264pay;
rtph264pay = GST_RTP_H264_PAY (object);
g_free (rtph264pay->sps);
g_free (rtph264pay->pps);
g_free (rtph264pay->profile_level_id);
g_free (rtph264pay->sprop_parameter_sets);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gchar *
encode_base64 (const guint8 * in, guint size, guint * len)
{
gchar *ret, *d;
static const gchar *v =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
*len = ((size + 2) / 3) * 4;
d = ret = (gchar *) g_malloc (*len + 1);
for (; size; in += 3) { /* process tuplets */
*d++ = v[in[0] >> 2]; /* byte 1: high 6 bits (1) */
/* byte 2: low 2 bits (1), high 4 bits (2) */
*d++ = v[((in[0] << 4) + (--size ? (in[1] >> 4) : 0)) & 0x3f];
/* byte 3: low 4 bits (2), high 2 bits (3) */
*d++ = size ? v[((in[1] << 2) + (--size ? (in[2] >> 6) : 0)) & 0x3f] : '=';
/* byte 4: low 6 bits (3) */
*d++ = size ? v[in[2] & 0x3f] : '=';
if (size)
size--; /* count third character if processed */
}
*d = '\0'; /* tie off string */
return ret; /* return the resulting string */
}
static gboolean
gst_rtp_h264_pay_setcaps (GstBaseRTPPayload * basepayload, GstCaps * caps)
{
GstRtpH264Pay *rtph264pay;
GstStructure *str;
const GValue *value;
guint8 *data;
guint size;
rtph264pay = GST_RTP_H264_PAY (basepayload);
str = gst_caps_get_structure (caps, 0);
/* we can only set the output caps when we found the sprops and profile
* NALs */
gst_basertppayload_set_options (basepayload, "video", TRUE, "H264", 90000);
/* packetized AVC video has a codec_data */
if ((value = gst_structure_get_value (str, "codec_data"))) {
GstBuffer *buffer;
GString *sprops;
guint num_sps, num_pps;
gint i, count, nal_size;
gint profile;
gchar *profile_str;
GST_DEBUG_OBJECT (rtph264pay, "have packetized h264");
rtph264pay->packetized = TRUE;
buffer = gst_value_get_buffer (value);
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
/* parse the avcC data */
if (size < 7)
goto avcc_too_small;
/* parse the version, this must be 1 */
if (data[0] != 1)
goto wrong_version;
/* AVCProfileIndication */
/* profile_compat */
/* AVCLevelIndication */
profile = (data[1] << 16) | (data[2] << 8) | data[3];
GST_DEBUG_OBJECT (rtph264pay, "profile %06x", profile);
/* 6 bits reserved | 2 bits lengthSizeMinusOne */
/* this is the number of bytes in front of the NAL units to mark their
* length */
rtph264pay->nal_length_size = (data[4] & 0x03) + 1;
GST_DEBUG_OBJECT (rtph264pay, "nal length %u", rtph264pay->nal_length_size);
/* 3 bits reserved | 5 bits numOfSequenceParameterSets */
num_sps = data[5] & 0x1f;
GST_DEBUG_OBJECT (rtph264pay, "num SPS %u", num_sps);
data += 6;
size -= 6;
/* create the sprop-parameter-sets */
sprops = g_string_new ("");
count = 0;
for (i = 0; i < num_sps; i++) {
gchar *set;
guint len;
if (size < 2)
goto avcc_error;
nal_size = (data[0] << 8) | data[1];
data += 2;
size -= 2;
GST_LOG_OBJECT (rtph264pay, "SPS %d size %d", i, nal_size);
if (size < nal_size)
goto avcc_error;
set = encode_base64 (data, nal_size, &len);
g_string_append_printf (sprops, "%s%s", count ? "," : "", set);
count++;
g_free (set);
data += nal_size;
size -= nal_size;
}
if (size < 1)
goto avcc_error;
/* 8 bits numOfPictureParameterSets */
num_pps = data[0];
data += 1;
size -= 1;
GST_DEBUG_OBJECT (rtph264pay, "num PPS %u", num_pps);
for (i = 0; i < num_pps; i++) {
gchar *set;
guint len;
if (size < 2)
goto avcc_error;
nal_size = (data[0] << 8) | data[1];
data += 2;
size -= 2;
GST_LOG_OBJECT (rtph264pay, "PPS %d size %d", i, nal_size);
if (size < nal_size)
goto avcc_error;
set = encode_base64 (data, nal_size, &len);
g_string_append_printf (sprops, "%s%s", count ? "," : "", set);
count++;
g_free (set);
data += nal_size;
size -= nal_size;
}
GST_DEBUG_OBJECT (rtph264pay, "sprops %s", sprops->str);
profile_str = g_strdup_printf ("%06x", profile);
gst_basertppayload_set_outcaps (basepayload, "profile-level-id",
G_TYPE_STRING, profile_str,
"sprop-parameter-sets", G_TYPE_STRING, sprops->str, NULL);
g_free (profile_str);
g_string_free (sprops, TRUE);
} else {
GST_DEBUG_OBJECT (rtph264pay, "have bytestream h264");
rtph264pay->packetized = FALSE;
}
return TRUE;
avcc_too_small:
{
GST_ERROR_OBJECT (rtph264pay, "avcC size %u < 7", size);
return FALSE;
}
wrong_version:
{
GST_ERROR_OBJECT (rtph264pay, "wrong avcC version");
return FALSE;
}
avcc_error:
{
GST_ERROR_OBJECT (rtph264pay, "avcC too small ");
return FALSE;
}
}
static guint
next_start_code (guint8 * data, guint size)
{
/* Boyer-Moore string matching algorithm, in a degenerative
* sense because our search 'alphabet' is binary - 0 & 1 only.
* This allow us to simplify the general BM algorithm to a very
* simple form. */
/* assume 1 is in the 4th byte */
guint offset = 3;
while (offset < size) {
if (1 == data[offset]) {
unsigned int shift = offset;
if (0 == data[--shift]) {
if (0 == data[--shift]) {
if (0 == data[--shift]) {
return shift;
}
}
}
/* The jump is always 4 because of the 1 previously matched.
* All the 0's must be after this '1' matched at offset */
offset += 4;
} else if (0 == data[offset]) {
/* maybe next byte is 1? */
offset++;
} else {
/* can jump 4 bytes forward */
offset += 4;
}
/* at each iteration, we rescan in a backward manner until
* we match 0.0.0.1 in reverse order. Since our search string
* has only 2 'alpabets' (i.e. 0 & 1), we know that any
* mismatch will force us to shift a fixed number of steps */
}
GST_DEBUG ("Cannot find next NAL start code. returning %u", size);
return size;
}
/* we don't use memcpy but this faster version (around 20%) because we need to
* perform it on all data. */
static gboolean
is_nal_equal (const guint8 * nal1, const guint8 * nal2, guint len)
{
/* if we have a 64-bit processor, we may use guint64 to make
* this go faster. Otherwise with 32 bits, we are already
* going faster than byte to byte compare.
*/
guint remainder = len & 0x3;
guint num_int = len >> 2;
guint32 *pu1 = (guint32 *) nal1, *pu2 = (guint32 *) nal2;
guint i;
/* compare by groups of sizeof(guint32) bytes */
for (i = 0; i < num_int; i++) {
/* XOR is faster than CMP?... */
if (pu1[i] ^ pu2[i])
return FALSE;
}
/* check that the remaining bytes are still equal */
if (!remainder) {
return TRUE;
} else if (1 == remainder) {
--len;
return (nal1[len] == nal2[len]);
} else { /* 2 or 3 */
if (remainder & 1) { /* -1 if 3 bytes left */
--len;
if (nal1[len] != nal2[len])
return FALSE;
}
/* last 2 bytes */
return ((nal1[len - 1] == nal2[len - 1]) /* -1 */
&&(nal1[len - 2] == nal2[len - 2])); /* -2 */
}
}
static void
gst_rtp_h264_pay_decode_nal (GstRtpH264Pay * payloader,
guint8 * data, guint size, gboolean * updated)
{
guint8 *sps = NULL, *pps = NULL;
guint sps_len = 0, pps_len = 0;
guint8 header, type;
guint len;
/* default is no update */
*updated = FALSE;
GST_DEBUG ("NAL payload len=%u", size);
len = size;
header = data[0];
type = header & 0x1f;
/* keep sps & pps separately so that we can update either one
* independently */
if (SPS_TYPE_ID == type) {
/* encode the entire SPS NAL in base64 */
GST_DEBUG ("Found SPS %x %x %x Len=%u", (header >> 7),
(header >> 5) & 3, type, len);
sps = data;
sps_len = len;
} else if (PPS_TYPE_ID == type) {
/* encoder the entire PPS NAL in base64 */
GST_DEBUG ("Found PPS %x %x %x Len = %u",
(header >> 7), (header >> 5) & 3, type, len);
pps = data;
pps_len = len;
} else {
GST_DEBUG ("NAL: %x %x %x Len = %u", (header >> 7),
(header >> 5) & 3, type, len);
}
/* If we encountered an SPS and/or a PPS, check if it's the
* same as the one we have. If not, update our version and
* set *updated to TRUE
*/
if (sps_len > 0) {
if ((payloader->sps_len != sps_len)
|| !is_nal_equal (payloader->sps, sps, sps_len)) {
payloader->profile = (sps[1] << 16) + (sps[2] << 8) + sps[3];
GST_DEBUG ("Profile level IDC = %06x", payloader->profile);
if (payloader->sps_len)
g_free (payloader->sps);
payloader->sps = sps_len ? g_new (guint8, sps_len) : NULL;
memcpy (payloader->sps, sps, sps_len);
payloader->sps_len = sps_len;
*updated = TRUE;
}
}
if (pps_len > 0) {
if ((payloader->pps_len != pps_len)
|| !is_nal_equal (payloader->pps, pps, pps_len)) {
if (payloader->pps_len)
g_free (payloader->pps);
payloader->pps = pps_len ? g_new (guint8, pps_len) : NULL;
memcpy (payloader->pps, pps, pps_len);
payloader->pps_len = pps_len;
*updated = TRUE;
}
}
}
static void
gst_rtp_h264_pay_parse_sps_pps (GstBaseRTPPayload * basepayload,
guint8 * data, guint size)
{
gboolean update = FALSE;
GstRtpH264Pay *payloader = GST_RTP_H264_PAY (basepayload);
gst_rtp_h264_pay_decode_nal (payloader, data, size, &update);
/* if has new SPS & PPS, update the output caps */
if (update) {
gchar *profile;
gchar *sps;
gchar *pps;
gchar *sprops;
guint len;
/* profile is 24 bit. Force it to respect the limit */
profile = g_strdup_printf ("%06x", payloader->profile & 0xffffff);
/* build the sprop-parameter-sets */
sps = (payloader->sps_len > 0)
? encode_base64 (payloader->sps, payloader->sps_len, &len) : NULL;
pps = (payloader->pps_len > 0)
? encode_base64 (payloader->pps, payloader->pps_len, &len) : NULL;
if (sps)
sprops = g_strjoin (",", sps, pps, NULL);
else
sprops = g_strdup (pps);
gst_basertppayload_set_outcaps (basepayload, "profile-level-id",
G_TYPE_STRING, profile,
"sprop-parameter-sets", G_TYPE_STRING, sprops, NULL);
GST_DEBUG ("outcaps udpate: profile=%s, sps=%s, pps=%s",
profile, GST_STR_NULL (sps), GST_STR_NULL (pps));
g_free (sprops);
g_free (profile);
g_free (sps);
g_free (pps);
}
}
static GstFlowReturn
gst_rtp_h264_pay_payload_nal (GstBaseRTPPayload * basepayload, guint8 * data,
guint size, GstClockTime timestamp)
{
GstRtpH264Pay *rtph264pay;
GstFlowReturn ret;
guint8 nalType;
guint packet_len, payload_len, mtu;
GstBuffer *outbuf;
guint8 *payload;
rtph264pay = GST_RTP_H264_PAY (basepayload);
mtu = GST_BASE_RTP_PAYLOAD_MTU (rtph264pay);
nalType = data[0] & 0x1f;
GST_DEBUG_OBJECT (rtph264pay, "Processing Buffer with NAL TYPE=%d", nalType);
packet_len = gst_rtp_buffer_calc_packet_len (size, 0, 0);
if (packet_len < mtu) {
GST_DEBUG_OBJECT (basepayload,
"NAL Unit fit in one packet datasize=%d mtu=%d", size, mtu);
/* will fit in one packet */
outbuf = gst_rtp_buffer_new_allocate (size, 0, 0);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
/* only set the marker bit on packets containing access units */
if (IS_ACCESS_UNIT (nalType)) {
gst_rtp_buffer_set_marker (outbuf, 1);
}
payload = gst_rtp_buffer_get_payload (outbuf);
GST_DEBUG_OBJECT (basepayload, "Copying %d bytes to outbuf", size);
memcpy (payload, data, size);
ret = gst_basertppayload_push (basepayload, outbuf);
} else {
/* Fragmentation Units FU-A */
guint8 nalHeader;
guint limitedSize;
int ii = 0, start = 1, end = 0, first = 0;
GST_DEBUG_OBJECT (basepayload,
"NAL Unit DOES NOT fit in one packet datasize=%d mtu=%d", size, mtu);
nalHeader = *data;
data++;
size--;
ret = GST_FLOW_OK;
GST_DEBUG_OBJECT (basepayload, "Using FU-A fragmentation for data size=%d",
size);
/* We keep 2 bytes for FU indicator and FU Header */
payload_len = gst_rtp_buffer_calc_payload_len (mtu - 2, 0, 0);
while (end == 0) {
limitedSize = size < payload_len ? size : payload_len;
GST_DEBUG_OBJECT (basepayload,
"Inside FU-A fragmentation limitedSize=%d iteration=%d", limitedSize,
ii);
outbuf = gst_rtp_buffer_new_allocate (limitedSize + 2, 0, 0);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
payload = gst_rtp_buffer_get_payload (outbuf);
if (limitedSize == size) {
GST_DEBUG_OBJECT (basepayload, "end size=%d iteration=%d", size, ii);
end = 1;
}
if (IS_ACCESS_UNIT (nalType)) {
gst_rtp_buffer_set_marker (outbuf, end);
}
/* FU indicator */
payload[0] = (nalHeader & 0x60) | 28;
/* FU Header */
payload[1] = (start << 7) | (end << 6) | (nalHeader & 0x1f);
memcpy (&payload[2], data + first, limitedSize);
GST_DEBUG_OBJECT (basepayload,
"recorded %d payload bytes into packet iteration=%d", limitedSize + 2,
ii);
ret = gst_basertppayload_push (basepayload, outbuf);
if (ret != GST_FLOW_OK)
break;
size -= limitedSize;
first += limitedSize;
ii++;
start = 0;
}
}
return ret;
}
static GstFlowReturn
gst_rtp_h264_pay_handle_buffer (GstBaseRTPPayload * basepayload,
GstBuffer * buffer)
{
GstRtpH264Pay *rtph264pay;
GstFlowReturn ret;
guint size, nal_len;
guint8 *data;
GstClockTime timestamp;
rtph264pay = GST_RTP_H264_PAY (basepayload);
/* the input buffer contains one or more NAL units */
size = GST_BUFFER_SIZE (buffer);
data = GST_BUFFER_DATA (buffer);
timestamp = GST_BUFFER_TIMESTAMP (buffer);
ret = GST_FLOW_OK;
GST_DEBUG_OBJECT (basepayload, "got %d bytes", size);
/* now loop over all NAL units and put them in a packet
* FIXME, we should really try to pack multiple NAL units into one RTP packet
* if we can, especially for the config packets that wont't cause decoder
* latency. */
if (rtph264pay->packetized) {
guint nal_length_size;
nal_length_size = rtph264pay->nal_length_size;
while (size > nal_length_size) {
gint i;
nal_len = 0;
for (i = 0; i < nal_length_size; i++) {
nal_len = ((nal_len << 8) + data[i]);
}
/* skip the length bytes, make sure we don't run past the buffer size */
data += nal_length_size;
size -= nal_length_size;
if (size >= nal_len) {
GST_DEBUG_OBJECT (basepayload, "got NAL of size %u", nal_len);
} else {
nal_len = size;
GST_DEBUG_OBJECT (basepayload, "got incomplete NAL of size %u",
nal_len);
}
ret =
gst_rtp_h264_pay_payload_nal (basepayload, data, nal_len, timestamp);
if (ret != GST_FLOW_OK)
break;
data += nal_len;
size -= nal_len;
}
} else {
guint next;
/* get offset of first start code */
next = next_start_code (data, size);
/* skip to start code, if no start code is found, next will be size and we
* will not collect data. */
data += next;
size -= next;
GST_DEBUG_OBJECT (basepayload, "found first start at %u, bytes left %u",
next, size);
while (size > 4) {
/* skip start code */
data += 4;
size -= 4;
if (rtph264pay->scan_mode == GST_H264_SCAN_MODE_SINGLE_NAL) {
/* we are told that there is only a single NAL in this packet so that we
* can avoid scanning for the next NAL. */
next = size;
} else {
/* use next_start_code() to scan buffer.
* next_start_code() returns the offset in data,
* starting from zero to the first byte of 0.0.0.1
* If no start code is found, it returns the value of the
* 'size' parameter.
* data is unchanged by the call to next_start_code()
*/
next = next_start_code (data, size);
}
/* nal length is distance to next start code */
nal_len = next;
GST_DEBUG_OBJECT (basepayload, "found next start at %u of size %u", next,
nal_len);
if (rtph264pay->profile_level_id != NULL &&
rtph264pay->sprop_parameter_sets != NULL) {
if (rtph264pay->update_caps) {
gst_basertppayload_set_outcaps (basepayload, "profile-level-id",
G_TYPE_STRING, rtph264pay->profile_level_id,
"sprop-parameter-sets", G_TYPE_STRING,
rtph264pay->sprop_parameter_sets, NULL);
rtph264pay->update_caps = FALSE;
GST_DEBUG
("outcaps udpate: profile-level-id=%s, sprop-parameter-sets=%s",
rtph264pay->profile_level_id, rtph264pay->sprop_parameter_sets);
}
} else {
/* We know our stream is a valid H264 NAL packet,
* go parse it for SPS/PPS to enrich the caps */
gst_rtp_h264_pay_parse_sps_pps (basepayload, data, nal_len);
}
/* put the data in one or more RTP packets */
ret =
gst_rtp_h264_pay_payload_nal (basepayload, data, nal_len, timestamp);
if (ret != GST_FLOW_OK)
break;
/* move to next NAL packet */
data += nal_len;
size -= nal_len;
}
}
gst_buffer_unref (buffer);
return ret;
}
static GstStateChangeReturn
gst_rtp_h264_pay_change_state (GstElement * element, GstStateChange transition)
{
GstRtpH264Pay *rtph264pay;
GstStateChangeReturn ret;
rtph264pay = GST_RTP_H264_PAY (element);
switch (transition) {
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
default:
break;
}
return ret;
}
static void
gst_rtp_h264_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpH264Pay *rtph264pay;
rtph264pay = GST_RTP_H264_PAY (object);
switch (prop_id) {
case PROP_PROFILE_LEVEL_ID:
g_free (rtph264pay->profile_level_id);
rtph264pay->profile_level_id = g_value_dup_string (value);
rtph264pay->update_caps = TRUE;
break;
case PROP_SPROP_PARAMETER_SETS:
g_free (rtph264pay->sprop_parameter_sets);
rtph264pay->sprop_parameter_sets = g_value_dup_string (value);
rtph264pay->update_caps = TRUE;
break;
case PROP_SCAN_MODE:
rtph264pay->scan_mode = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_h264_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRtpH264Pay *rtph264pay;
rtph264pay = GST_RTP_H264_PAY (object);
switch (prop_id) {
case PROP_PROFILE_LEVEL_ID:
g_value_set_string (value, rtph264pay->profile_level_id);
break;
case PROP_SPROP_PARAMETER_SETS:
g_value_set_string (value, rtph264pay->sprop_parameter_sets);
break;
case PROP_SCAN_MODE:
g_value_set_enum (value, rtph264pay->scan_mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_rtp_h264_pay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtph264pay",
GST_RANK_NONE, GST_TYPE_RTP_H264_PAY);
}
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