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vlc-1.1
Commit 14fae49c authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
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Split RTP sout further

parent 1d22fe1f
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Showing with 774 additions and 722 deletions
modules/stream_out/Modules.am
View file @ 14fae49c
......@@ -6,7 +6,7 @@ SOURCES_stream_out_duplicate = duplicate.c
SOURCES_stream_out_es = es.c
SOURCES_stream_out_display = display.c
SOURCES_stream_out_gather = gather.c
SOURCES_stream_out_rtp = rtp.h rtp.c rtcp.c rtsp.c
SOURCES_stream_out_rtp = rtp.h rtp.c rtpfmt.c rtcp.c rtsp.c
SOURCES_stream_out_switcher = switcher.c
SOURCES_stream_out_bridge = bridge.c
SOURCES_stream_out_mosaic_bridge = mosaic_bridge.c
......
modules/stream_out/rtp.c
View file @ 14fae49c
......@@ -772,19 +772,6 @@ char *SDPGenerate( const sout_stream_t *p_stream, const char *rtsp_url )
/*****************************************************************************
* RTP mux
*****************************************************************************/
static int rtp_packetize_l16 ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_l8 ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_mpa ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_mpv ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_ac3 ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_split( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_mp4a ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_mp4a_latm ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_h263 ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_h264 ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_amr ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_spx ( sout_stream_t *, sout_stream_id_t *, block_t * );
static int rtp_packetize_t140 ( sout_stream_t *, sout_stream_id_t *, block_t * );
static void sprintf_hexa( char *s, uint8_t *p_data, int i_data )
{
......@@ -1435,11 +1422,6 @@ static void ThreadSend( vlc_object_t *p_this )
#endif
}
static inline void rtp_packetize_send( sout_stream_id_t *id, block_t *out )
{
block_FifoPut( id->p_fifo, out );
}
int rtp_add_sink( sout_stream_id_t *id, int fd, vlc_bool_t rtcp_mux )
{
rtp_sink_t sink = { fd, NULL };
......@@ -1501,11 +1483,8 @@ unsigned rtp_get_num( const sout_stream_id_t *id )
}
/****************************************************************************
* rtp_packetize_*:
****************************************************************************/
static void rtp_packetize_common( sout_stream_id_t *id, block_t *out,
int b_marker, int64_t i_pts )
void rtp_packetize_common( sout_stream_id_t *id, block_t *out,
int b_marker, int64_t i_pts )
{
uint32_t i_timestamp = i_pts * (int64_t)id->i_clock_rate / I64C(1000000);
......@@ -1524,636 +1503,29 @@ static void rtp_packetize_common( sout_stream_id_t *id, block_t *out,
id->i_sequence++;
}
static int rtp_packetize_mpa( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = id->i_mtu - 12 - 4; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 16 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, (i == i_count - 1)?1:0, in->i_pts );
/* mbz set to 0 */
out->p_buffer[12] = 0;
out->p_buffer[13] = 0;
/* fragment offset in the current frame */
out->p_buffer[14] = ( (i*i_max) >> 8 )&0xff;
out->p_buffer[15] = ( (i*i_max) )&0xff;
memcpy( &out->p_buffer[16], p_data, i_payload );
out->i_buffer = 16 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
/* rfc2250 */
static int rtp_packetize_mpv( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = id->i_mtu - 12 - 4; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
int b_sequence_start = 0;
int i_temporal_ref = 0;
int i_picture_coding_type = 0;
int i_fbv = 0, i_bfc = 0, i_ffv = 0, i_ffc = 0;
int b_start_slice = 0;
/* preparse this packet to get some info */
if( in->i_buffer > 4 )
{
uint8_t *p = p_data;
int i_rest = in->i_buffer;
for( ;; )
{
while( i_rest > 4 &&
( p[0] != 0x00 || p[1] != 0x00 || p[2] != 0x01 ) )
{
p++;
i_rest--;
}
if( i_rest <= 4 )
{
break;
}
p += 3;
i_rest -= 4;
if( *p == 0xb3 )
{
/* sequence start code */
b_sequence_start = 1;
}
else if( *p == 0x00 && i_rest >= 4 )
{
/* picture */
i_temporal_ref = ( p[1] << 2) |((p[2]>>6)&0x03);
i_picture_coding_type = (p[2] >> 3)&0x07;
if( i_rest >= 4 && ( i_picture_coding_type == 2 ||
i_picture_coding_type == 3 ) )
{
i_ffv = (p[3] >> 2)&0x01;
i_ffc = ((p[3]&0x03) << 1)|((p[4]>>7)&0x01);
if( i_rest > 4 && i_picture_coding_type == 3 )
{
i_fbv = (p[4]>>6)&0x01;
i_bfc = (p[4]>>3)&0x07;
}
}
}
else if( *p <= 0xaf )
{
b_start_slice = 1;
}
}
}
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream,
16 + i_payload );
uint32_t h = ( i_temporal_ref << 16 )|
( b_sequence_start << 13 )|
( b_start_slice << 12 )|
( i == i_count - 1 ? 1 << 11 : 0 )|
( i_picture_coding_type << 8 )|
( i_fbv << 7 )|( i_bfc << 4 )|( i_ffv << 3 )|i_ffc;
/* rtp common header */
rtp_packetize_common( id, out, (i == i_count - 1)?1:0,
in->i_pts > 0 ? in->i_pts : in->i_dts );
/* MBZ:5 T:1 TR:10 AN:1 N:1 S:1 B:1 E:1 P:3 FBV:1 BFC:3 FFV:1 FFC:3 */
out->p_buffer[12] = ( h >> 24 )&0xff;
out->p_buffer[13] = ( h >> 16 )&0xff;
out->p_buffer[14] = ( h >> 8 )&0xff;
out->p_buffer[15] = ( h )&0xff;
memcpy( &out->p_buffer[16], p_data, i_payload );
out->i_buffer = 16 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
static int rtp_packetize_ac3( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = id->i_mtu - 12 - 2; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 14 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, (i == i_count - 1)?1:0, in->i_pts );
/* unit count */
out->p_buffer[12] = 1;
/* unit header */
out->p_buffer[13] = 0x00;
/* data */
memcpy( &out->p_buffer[14], p_data, i_payload );
out->i_buffer = 14 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
static int rtp_packetize_split( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = id->i_mtu - 12; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 12 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, ((i == i_count - 1)?1:0),
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
memcpy( &out->p_buffer[12], p_data, i_payload );
out->i_buffer = 12 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
/* rfc3016 */
static int rtp_packetize_mp4a_latm( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = id->i_mtu - 14; /* payload max in one packet */
int latmhdrsize = in->i_buffer / 0xff + 1;
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer, *p_header = NULL;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out;
if( i != 0 )
latmhdrsize = 0;
out = block_New( p_stream, 12 + latmhdrsize + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, ((i == i_count - 1) ? 1 : 0),
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
if( i == 0 )
{
int tmp = in->i_buffer;
p_header=out->p_buffer+12;
while( tmp > 0xfe )
{
*p_header = 0xff;
p_header++;
tmp -= 0xff;
}
*p_header = tmp;
}
memcpy( &out->p_buffer[12+latmhdrsize], p_data, i_payload );
out->i_buffer = 12 + latmhdrsize + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
static int rtp_packetize_l16( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
const uint8_t *p_data = in->p_buffer;
size_t i_data = in->i_buffer;
/* ptime=20ms -> 50Hz */
size_t i_plen = 2 * id->i_channels * ( ( id->i_clock_rate + 49 ) / 50 );
for( unsigned i_packet = 0; i_data > 0; i_packet++ )
{
int i_payload = __MIN( i_plen, i_data );
block_t *out = block_New( p_stream, 12 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, 0,
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
memcpy( &out->p_buffer[12], p_data, i_payload );
out->i_buffer = 12 + i_payload;
out->i_dts = in->i_dts + i_packet * 20000;
out->i_length = i_payload * 20000 / i_plen;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
static int rtp_packetize_l8( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
const uint8_t *p_data = in->p_buffer;
size_t i_data = in->i_buffer;
/* ptime=20ms -> 50Hz */
size_t i_plen = id->i_channels * ( ( id->i_clock_rate + 49 ) / 50 );
for( unsigned i_packet = 0; i_data > 0; i_packet++ )
{
int i_payload = __MIN( i_plen, i_data );
block_t *out = block_New( p_stream, 12 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, 0,
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
memcpy( &out->p_buffer[12], p_data, i_payload );
out->i_buffer = 12 + i_payload;
out->i_dts = in->i_dts + i_packet * 20000;
out->i_length = i_payload * 20000 / i_plen;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
static int rtp_packetize_mp4a( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
void rtp_packetize_send( sout_stream_id_t *id, block_t *out )
{
int i_max = id->i_mtu - 16; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 16 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, ((i == i_count - 1)?1:0),
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
/* AU headers */
/* AU headers length (bits) */
out->p_buffer[12] = 0;
out->p_buffer[13] = 2*8;
/* for each AU length 13 bits + idx 3bits, */
out->p_buffer[14] = ( in->i_buffer >> 5 )&0xff;
out->p_buffer[15] = ( (in->i_buffer&0xff)<<3 )|0;
memcpy( &out->p_buffer[16], p_data, i_payload );
out->i_buffer = 16 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
block_FifoPut( id->p_fifo, out );
}
/* rfc2429 */
#define RTP_H263_HEADER_SIZE (2) // plen = 0
#define RTP_H263_PAYLOAD_START (14) // plen = 0
static int rtp_packetize_h263( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
/**
* @return configured max RTP payload size (including payload type-specific
* headers, excluding RTP and transport headers)
*/
size_t rtp_mtu (const sout_stream_id_t *id)
{
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
int i_max = id->i_mtu - 12 - RTP_H263_HEADER_SIZE; /* payload max in one packet */
int i_count;
int b_p_bit;
int b_v_bit = 0; // no pesky error resilience
int i_plen = 0; // normally plen=0 for PSC packet
int i_pebit = 0; // because plen=0
uint16_t h;
if( i_data < 2 )
{
return VLC_EGENERIC;
}
if( p_data[0] || p_data[1] )
{
return VLC_EGENERIC;
}
/* remove 2 leading 0 bytes */
p_data += 2;
i_data -= 2;
i_count = ( i_data + i_max - 1 ) / i_max;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream,
RTP_H263_PAYLOAD_START + i_payload );
b_p_bit = (i == 0) ? 1 : 0;
h = ( b_p_bit << 10 )|
( b_v_bit << 9 )|
( i_plen << 3 )|
i_pebit;
/* rtp common header */
//b_m_bit = 1; // always contains end of frame
rtp_packetize_common( id, out, (i == i_count - 1)?1:0,
in->i_pts > 0 ? in->i_pts : in->i_dts );
/* h263 header */
out->p_buffer[12] = ( h >> 8 )&0xff;
out->p_buffer[13] = ( h )&0xff;
memcpy( &out->p_buffer[RTP_H263_PAYLOAD_START], p_data, i_payload );
out->i_buffer = RTP_H263_PAYLOAD_START + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
return id->i_mtu - 12;
}
/* rfc3984 */
static int
rtp_packetize_h264_nal( sout_stream_t *p_stream, sout_stream_id_t *id,
const uint8_t *p_data, int i_data, int64_t i_pts,
int64_t i_dts, vlc_bool_t b_last, int64_t i_length )
/**
* @return number of audio samples to include for a given packetization time
* (this really only makes sense for audio formats).
*/
size_t rtp_plen (const sout_stream_id_t * id, unsigned ptime_ms)
{
const int i_max = id->i_mtu - 12; /* payload max in one packet */
int i_nal_hdr;
int i_nal_type;
if( i_data < 5 )
return VLC_SUCCESS;
i_nal_hdr = p_data[3];
i_nal_type = i_nal_hdr&0x1f;
/* Skip start code */
p_data += 3;
i_data -= 3;
/* */
if( i_data <= i_max )
{
/* Single NAL unit packet */
block_t *out = block_New( p_stream, 12 + i_data );
out->i_dts = i_dts;
out->i_length = i_length;
/* */
rtp_packetize_common( id, out, b_last, i_pts );
out->i_buffer = 12 + i_data;
memcpy( &out->p_buffer[12], p_data, i_data );
rtp_packetize_send( id, out );
}
else
{
/* FU-A Fragmentation Unit without interleaving */
const int i_count = ( i_data-1 + i_max-2 - 1 ) / (i_max-2);
int i;
p_data++;
i_data--;
for( i = 0; i < i_count; i++ )
{
const int i_payload = __MIN( i_data, i_max-2 );
block_t *out = block_New( p_stream, 12 + 2 + i_payload );
out->i_dts = i_dts + i * i_length / i_count;
out->i_length = i_length / i_count;
/* */
rtp_packetize_common( id, out, (b_last && i_payload == i_data), i_pts );
out->i_buffer = 14 + i_payload;
/* FU indicator */
out->p_buffer[12] = 0x00 | (i_nal_hdr & 0x60) | 28;
/* FU header */
out->p_buffer[13] = ( i == 0 ? 0x80 : 0x00 ) | ( (i == i_count-1) ? 0x40 : 0x00 ) | i_nal_type;
memcpy( &out->p_buffer[14], p_data, i_payload );
rtp_packetize_send( id, out );
i_data -= i_payload;
p_data += i_payload;
}
}
return VLC_SUCCESS;
return id->i_channels * (((id->i_clock_rate - 1) * ptime_ms / 1000) + 1);
}
static int rtp_packetize_h264( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
const uint8_t *p_buffer = in->p_buffer;
int i_buffer = in->i_buffer;
while( i_buffer > 4 && ( p_buffer[0] != 0 || p_buffer[1] != 0 || p_buffer[2] != 1 ) )
{
i_buffer--;
p_buffer++;
}
/* Split nal units */
while( i_buffer > 4 )
{
int i_offset;
int i_size = i_buffer;
int i_skip = i_buffer;
/* search nal end */
for( i_offset = 4; i_offset+2 < i_buffer ; i_offset++)
{
if( p_buffer[i_offset] == 0 && p_buffer[i_offset+1] == 0 && p_buffer[i_offset+2] == 1 )
{
/* we found another startcode */
i_size = i_offset - ( p_buffer[i_offset-1] == 0 ? 1 : 0);
i_skip = i_offset;
break;
}
}
/* TODO add STAP-A to remove a lot of overhead with small slice/sei/... */
rtp_packetize_h264_nal( p_stream, id, p_buffer, i_size,
(in->i_pts > 0 ? in->i_pts : in->i_dts), in->i_dts,
(i_size >= i_buffer), in->i_length * i_size / in->i_buffer );
i_buffer -= i_skip;
p_buffer += i_skip;
}
return VLC_SUCCESS;
}
static int rtp_packetize_amr( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = id->i_mtu - 14; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
/* Only supports octet-aligned mode */
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 14 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, ((i == i_count - 1)?1:0),
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
/* Payload header */
out->p_buffer[12] = 0xF0; /* CMR */
out->p_buffer[13] = p_data[0]&0x7C; /* ToC */ /* FIXME: frame type */
/* FIXME: are we fed multiple frames ? */
memcpy( &out->p_buffer[14], p_data+1, i_payload-1 );
out->i_buffer = 14 + i_payload-1;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
static int rtp_packetize_t140( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
const size_t i_max = id->i_mtu - 12;
const uint8_t *p_data = in->p_buffer;
size_t i_data = in->i_buffer;
for( unsigned i_packet = 0; i_data > 0; i_packet++ )
{
size_t i_payload = i_data;
/* Make sure we stop on an UTF-8 character boundary
* (assuming the input is valid UTF-8) */
if( i_data > i_max )
{
i_payload = i_max;
while( ( p_data[i_payload] & 0xC0 ) == 0x80 )
{
if( i_payload == 0 )
return VLC_SUCCESS; /* fishy input! */
i_payload--;
}
}
block_t *out = block_New( p_stream, 12 + i_payload );
if( out == NULL )
return VLC_SUCCESS;
rtp_packetize_common( id, out, 0, in->i_pts + i_packet );
memcpy( out->p_buffer + 12, p_data, i_payload );
out->i_buffer = 12 + i_payload;
out->i_dts = out->i_pts;
out->i_length = 0;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
/*****************************************************************************
* Non-RTP mux
......@@ -2288,80 +1660,3 @@ static sout_access_out_t *GrabberCreate( sout_stream_t *p_stream )
p_grab->pf_write = AccessOutGrabberWrite;
return p_grab;
}
static int rtp_packetize_spx( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
uint8_t *p_buffer = in->p_buffer;
int i_data_size, i_payload_size, i_payload_padding;
i_data_size = i_payload_size = in->i_buffer;
i_payload_padding = 0;
block_t *p_out;
if ( in->i_buffer + 12 > id->i_mtu )
{
msg_Warn( p_stream, "Cannot send packet larger than output MTU" );
return VLC_SUCCESS;
}
/*
RFC for Speex in RTP says that each packet must end on an octet
boundary. So, we check to see if the number of bytes % 4 is zero.
If not, we have to add some padding.
This MAY be overkill since packetization is handled elsewhere and
appears to ensure the octet boundary. However, better safe than
sorry.
*/
if ( i_payload_size % 4 )
{
i_payload_padding = 4 - ( i_payload_size % 4 );
i_payload_size += i_payload_padding;
}
/*
Allocate a new RTP p_output block of the appropriate size.
Allow for 12 extra bytes of RTP header.
*/
p_out = block_New( p_stream, 12 + i_payload_size );
if ( i_payload_padding )
{
/*
The padding is required to be a zero followed by all 1s.
*/
char c_first_pad, c_remaining_pad;
c_first_pad = 0x7F;
c_remaining_pad = 0xFF;
/*
Allow for 12 bytes before the i_data_size because
of the expected RTP header added during
rtp_packetize_common.
*/
p_out->p_buffer[12 + i_data_size] = c_first_pad;
switch (i_payload_padding)
{
case 2:
p_out->p_buffer[12 + i_data_size + 1] = c_remaining_pad;
break;
case 3:
p_out->p_buffer[12 + i_data_size + 1] = c_remaining_pad;
p_out->p_buffer[12 + i_data_size + 2] = c_remaining_pad;
break;
}
}
/* Add the RTP header to our p_output buffer. */
rtp_packetize_common( id, p_out, 0, (in->i_pts > 0 ? in->i_pts : in->i_dts) );
/* Copy the Speex payload to the p_output buffer */
memcpy( &p_out->p_buffer[12], p_buffer, i_data_size );
p_out->i_buffer = 12 + i_payload_size;
p_out->i_dts = in->i_dts;
p_out->i_length = in->i_length;
/* Queue the buffer for actual transmission. */
rtp_packetize_send( id, p_out );
return VLC_SUCCESS;
}
modules/stream_out/rtp.h
View file @ 14fae49c
......@@ -41,6 +41,27 @@ void rtp_del_sink( sout_stream_id_t *id, int fd );
uint16_t rtp_get_seq( const sout_stream_id_t *id );
unsigned rtp_get_num( const sout_stream_id_t *id );
/* RTP packetization */
void rtp_packetize_common (sout_stream_id_t *id, block_t *out,
int b_marker, int64_t i_pts);
void rtp_packetize_send (sout_stream_id_t *id, block_t *out);
size_t rtp_mtu (const sout_stream_id_t *id);
size_t rtp_plen (const sout_stream_id_t * id, unsigned ptime);
int rtp_packetize_l16 (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_l8 (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_mpa (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_mpv (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_ac3 (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_split(sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_mp4a (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_mp4a_latm (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_h263 (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_h264 (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_amr (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_spx (sout_stream_t *, sout_stream_id_t *, block_t *);
int rtp_packetize_t140 (sout_stream_t *, sout_stream_id_t *, block_t *);
/* RTCP */
typedef struct rtcp_sender_t rtcp_sender_t;
rtcp_sender_t *OpenRTCP (vlc_object_t *obj, int rtp_fd, int proto,
......
modules/stream_out/rtpfmt.c 0 → 100644
View file @ 14fae49c
/*****************************************************************************
* rtp.c: rtp stream output module
*****************************************************************************
* Copyright (C) 2003-2004 the VideoLAN team
* Copyright © 2007 Rémi Denis-Courmont
* $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include <vlc/vlc.h>
#include <vlc_sout.h>
#include <vlc_block.h>
#include "rtp.h"
int rtp_packetize_mpa( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = rtp_mtu (id) - 12 - 4; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 16 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, (i == i_count - 1)?1:0, in->i_pts );
/* mbz set to 0 */
out->p_buffer[12] = 0;
out->p_buffer[13] = 0;
/* fragment offset in the current frame */
out->p_buffer[14] = ( (i*i_max) >> 8 )&0xff;
out->p_buffer[15] = ( (i*i_max) )&0xff;
memcpy( &out->p_buffer[16], p_data, i_payload );
out->i_buffer = 16 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
/* rfc2250 */
int rtp_packetize_mpv( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = rtp_mtu (id) - 12 - 4; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
int b_sequence_start = 0;
int i_temporal_ref = 0;
int i_picture_coding_type = 0;
int i_fbv = 0, i_bfc = 0, i_ffv = 0, i_ffc = 0;
int b_start_slice = 0;
/* preparse this packet to get some info */
if( in->i_buffer > 4 )
{
uint8_t *p = p_data;
int i_rest = in->i_buffer;
for( ;; )
{
while( i_rest > 4 &&
( p[0] != 0x00 || p[1] != 0x00 || p[2] != 0x01 ) )
{
p++;
i_rest--;
}
if( i_rest <= 4 )
{
break;
}
p += 3;
i_rest -= 4;
if( *p == 0xb3 )
{
/* sequence start code */
b_sequence_start = 1;
}
else if( *p == 0x00 && i_rest >= 4 )
{
/* picture */
i_temporal_ref = ( p[1] << 2) |((p[2]>>6)&0x03);
i_picture_coding_type = (p[2] >> 3)&0x07;
if( i_rest >= 4 && ( i_picture_coding_type == 2 ||
i_picture_coding_type == 3 ) )
{
i_ffv = (p[3] >> 2)&0x01;
i_ffc = ((p[3]&0x03) << 1)|((p[4]>>7)&0x01);
if( i_rest > 4 && i_picture_coding_type == 3 )
{
i_fbv = (p[4]>>6)&0x01;
i_bfc = (p[4]>>3)&0x07;
}
}
}
else if( *p <= 0xaf )
{
b_start_slice = 1;
}
}
}
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream,
16 + i_payload );
uint32_t h = ( i_temporal_ref << 16 )|
( b_sequence_start << 13 )|
( b_start_slice << 12 )|
( i == i_count - 1 ? 1 << 11 : 0 )|
( i_picture_coding_type << 8 )|
( i_fbv << 7 )|( i_bfc << 4 )|( i_ffv << 3 )|i_ffc;
/* rtp common header */
rtp_packetize_common( id, out, (i == i_count - 1)?1:0,
in->i_pts > 0 ? in->i_pts : in->i_dts );
/* MBZ:5 T:1 TR:10 AN:1 N:1 S:1 B:1 E:1 P:3 FBV:1 BFC:3 FFV:1 FFC:3 */
out->p_buffer[12] = ( h >> 24 )&0xff;
out->p_buffer[13] = ( h >> 16 )&0xff;
out->p_buffer[14] = ( h >> 8 )&0xff;
out->p_buffer[15] = ( h )&0xff;
memcpy( &out->p_buffer[16], p_data, i_payload );
out->i_buffer = 16 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
int rtp_packetize_ac3( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = rtp_mtu (id) - 12 - 2; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 14 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, (i == i_count - 1)?1:0, in->i_pts );
/* unit count */
out->p_buffer[12] = 1;
/* unit header */
out->p_buffer[13] = 0x00;
/* data */
memcpy( &out->p_buffer[14], p_data, i_payload );
out->i_buffer = 14 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
int rtp_packetize_split( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = rtp_mtu (id) - 12; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 12 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, (i == i_count - 1),
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
memcpy( &out->p_buffer[12], p_data, i_payload );
out->i_buffer = 12 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
/* rfc3016 */
int rtp_packetize_mp4a_latm( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = rtp_mtu (id) - 14; /* payload max in one packet */
int latmhdrsize = in->i_buffer / 0xff + 1;
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer, *p_header = NULL;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out;
if( i != 0 )
latmhdrsize = 0;
out = block_New( p_stream, 12 + latmhdrsize + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, ((i == i_count - 1) ? 1 : 0),
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
if( i == 0 )
{
int tmp = in->i_buffer;
p_header=out->p_buffer+12;
while( tmp > 0xfe )
{
*p_header = 0xff;
p_header++;
tmp -= 0xff;
}
*p_header = tmp;
}
memcpy( &out->p_buffer[12+latmhdrsize], p_data, i_payload );
out->i_buffer = 12 + latmhdrsize + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
int rtp_packetize_l16( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
const uint8_t *p_data = in->p_buffer;
size_t i_data = in->i_buffer;
size_t i_plen = 2 * rtp_plen (id, 20);
for( unsigned i_packet = 0; i_data > 0; i_packet++ )
{
int i_payload = __MIN( i_plen, i_data );
block_t *out = block_New( p_stream, 12 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, 0,
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
memcpy( &out->p_buffer[12], p_data, i_payload );
out->i_buffer = 12 + i_payload;
out->i_dts = in->i_dts + i_packet * 20000;
out->i_length = i_payload * 20000 / i_plen;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
int rtp_packetize_l8( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
const uint8_t *p_data = in->p_buffer;
size_t i_data = in->i_buffer;
size_t i_plen = rtp_plen (id, 20);
for( unsigned i_packet = 0; i_data > 0; i_packet++ )
{
int i_payload = __MIN( i_plen, i_data );
block_t *out = block_New( p_stream, 12 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, 0,
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
memcpy( &out->p_buffer[12], p_data, i_payload );
out->i_buffer = 12 + i_payload;
out->i_dts = in->i_dts + i_packet * 20000;
out->i_length = i_payload * 20000 / i_plen;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
int rtp_packetize_mp4a( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = rtp_mtu (id) - 16; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 16 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, ((i == i_count - 1)?1:0),
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
/* AU headers */
/* AU headers length (bits) */
out->p_buffer[12] = 0;
out->p_buffer[13] = 2*8;
/* for each AU length 13 bits + idx 3bits, */
out->p_buffer[14] = ( in->i_buffer >> 5 )&0xff;
out->p_buffer[15] = ( (in->i_buffer&0xff)<<3 )|0;
memcpy( &out->p_buffer[16], p_data, i_payload );
out->i_buffer = 16 + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
/* rfc2429 */
#define RTP_H263_HEADER_SIZE (2) // plen = 0
#define RTP_H263_PAYLOAD_START (14) // plen = 0
int rtp_packetize_h263( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
int i_max = rtp_mtu (id) - 12 - RTP_H263_HEADER_SIZE; /* payload max in one packet */
int i_count;
int b_p_bit;
int b_v_bit = 0; // no pesky error resilience
int i_plen = 0; // normally plen=0 for PSC packet
int i_pebit = 0; // because plen=0
uint16_t h;
if( i_data < 2 )
{
return VLC_EGENERIC;
}
if( p_data[0] || p_data[1] )
{
return VLC_EGENERIC;
}
/* remove 2 leading 0 bytes */
p_data += 2;
i_data -= 2;
i_count = ( i_data + i_max - 1 ) / i_max;
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream,
RTP_H263_PAYLOAD_START + i_payload );
b_p_bit = (i == 0) ? 1 : 0;
h = ( b_p_bit << 10 )|
( b_v_bit << 9 )|
( i_plen << 3 )|
i_pebit;
/* rtp common header */
//b_m_bit = 1; // always contains end of frame
rtp_packetize_common( id, out, (i == i_count - 1)?1:0,
in->i_pts > 0 ? in->i_pts : in->i_dts );
/* h263 header */
out->p_buffer[12] = ( h >> 8 )&0xff;
out->p_buffer[13] = ( h )&0xff;
memcpy( &out->p_buffer[RTP_H263_PAYLOAD_START], p_data, i_payload );
out->i_buffer = RTP_H263_PAYLOAD_START + i_payload;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
/* rfc3984 */
int
rtp_packetize_h264_nal( sout_stream_t *p_stream, sout_stream_id_t *id,
const uint8_t *p_data, int i_data, int64_t i_pts,
int64_t i_dts, vlc_bool_t b_last, int64_t i_length )
{
const int i_max = rtp_mtu (id) - 12; /* payload max in one packet */
int i_nal_hdr;
int i_nal_type;
if( i_data < 5 )
return VLC_SUCCESS;
i_nal_hdr = p_data[3];
i_nal_type = i_nal_hdr&0x1f;
/* Skip start code */
p_data += 3;
i_data -= 3;
/* */
if( i_data <= i_max )
{
/* Single NAL unit packet */
block_t *out = block_New( p_stream, 12 + i_data );
out->i_dts = i_dts;
out->i_length = i_length;
/* */
rtp_packetize_common( id, out, b_last, i_pts );
out->i_buffer = 12 + i_data;
memcpy( &out->p_buffer[12], p_data, i_data );
rtp_packetize_send( id, out );
}
else
{
/* FU-A Fragmentation Unit without interleaving */
const int i_count = ( i_data-1 + i_max-2 - 1 ) / (i_max-2);
int i;
p_data++;
i_data--;
for( i = 0; i < i_count; i++ )
{
const int i_payload = __MIN( i_data, i_max-2 );
block_t *out = block_New( p_stream, 12 + 2 + i_payload );
out->i_dts = i_dts + i * i_length / i_count;
out->i_length = i_length / i_count;
/* */
rtp_packetize_common( id, out, (b_last && i_payload == i_data), i_pts );
out->i_buffer = 14 + i_payload;
/* FU indicator */
out->p_buffer[12] = 0x00 | (i_nal_hdr & 0x60) | 28;
/* FU header */
out->p_buffer[13] = ( i == 0 ? 0x80 : 0x00 ) | ( (i == i_count-1) ? 0x40 : 0x00 ) | i_nal_type;
memcpy( &out->p_buffer[14], p_data, i_payload );
rtp_packetize_send( id, out );
i_data -= i_payload;
p_data += i_payload;
}
}
return VLC_SUCCESS;
}
int rtp_packetize_h264( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
const uint8_t *p_buffer = in->p_buffer;
int i_buffer = in->i_buffer;
while( i_buffer > 4 && ( p_buffer[0] != 0 || p_buffer[1] != 0 || p_buffer[2] != 1 ) )
{
i_buffer--;
p_buffer++;
}
/* Split nal units */
while( i_buffer > 4 )
{
int i_offset;
int i_size = i_buffer;
int i_skip = i_buffer;
/* search nal end */
for( i_offset = 4; i_offset+2 < i_buffer ; i_offset++)
{
if( p_buffer[i_offset] == 0 && p_buffer[i_offset+1] == 0 && p_buffer[i_offset+2] == 1 )
{
/* we found another startcode */
i_size = i_offset - ( p_buffer[i_offset-1] == 0 ? 1 : 0);
i_skip = i_offset;
break;
}
}
/* TODO add STAP-A to remove a lot of overhead with small slice/sei/... */
rtp_packetize_h264_nal( p_stream, id, p_buffer, i_size,
(in->i_pts > 0 ? in->i_pts : in->i_dts), in->i_dts,
(i_size >= i_buffer), in->i_length * i_size / in->i_buffer );
i_buffer -= i_skip;
p_buffer += i_skip;
}
return VLC_SUCCESS;
}
int rtp_packetize_amr( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
int i_max = rtp_mtu (id) - 14; /* payload max in one packet */
int i_count = ( in->i_buffer + i_max - 1 ) / i_max;
uint8_t *p_data = in->p_buffer;
int i_data = in->i_buffer;
int i;
/* Only supports octet-aligned mode */
for( i = 0; i < i_count; i++ )
{
int i_payload = __MIN( i_max, i_data );
block_t *out = block_New( p_stream, 14 + i_payload );
/* rtp common header */
rtp_packetize_common( id, out, ((i == i_count - 1)?1:0),
(in->i_pts > 0 ? in->i_pts : in->i_dts) );
/* Payload header */
out->p_buffer[12] = 0xF0; /* CMR */
out->p_buffer[13] = p_data[0]&0x7C; /* ToC */ /* FIXME: frame type */
/* FIXME: are we fed multiple frames ? */
memcpy( &out->p_buffer[14], p_data+1, i_payload-1 );
out->i_buffer = 14 + i_payload-1;
out->i_dts = in->i_dts + i * in->i_length / i_count;
out->i_length = in->i_length / i_count;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
int rtp_packetize_t140( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
const size_t i_max = rtp_mtu (id) - 12;
const uint8_t *p_data = in->p_buffer;
size_t i_data = in->i_buffer;
for( unsigned i_packet = 0; i_data > 0; i_packet++ )
{
size_t i_payload = i_data;
/* Make sure we stop on an UTF-8 character boundary
* (assuming the input is valid UTF-8) */
if( i_data > i_max )
{
i_payload = i_max;
while( ( p_data[i_payload] & 0xC0 ) == 0x80 )
{
if( i_payload == 0 )
return VLC_SUCCESS; /* fishy input! */
i_payload--;
}
}
block_t *out = block_New( p_stream, 12 + i_payload );
if( out == NULL )
return VLC_SUCCESS;
rtp_packetize_common( id, out, 0, in->i_pts + i_packet );
memcpy( out->p_buffer + 12, p_data, i_payload );
out->i_buffer = 12 + i_payload;
out->i_dts = out->i_pts;
out->i_length = 0;
rtp_packetize_send( id, out );
p_data += i_payload;
i_data -= i_payload;
}
return VLC_SUCCESS;
}
int rtp_packetize_spx( sout_stream_t *p_stream, sout_stream_id_t *id,
block_t *in )
{
uint8_t *p_buffer = in->p_buffer;
int i_data_size, i_payload_size, i_payload_padding;
i_data_size = i_payload_size = in->i_buffer;
i_payload_padding = 0;
block_t *p_out;
if ( in->i_buffer + 12 > rtp_mtu (id) )
{
msg_Warn( p_stream, "Cannot send packet larger than output MTU" );
return VLC_SUCCESS;
}
/*
RFC for Speex in RTP says that each packet must end on an octet
boundary. So, we check to see if the number of bytes % 4 is zero.
If not, we have to add some padding.
This MAY be overkill since packetization is handled elsewhere and
appears to ensure the octet boundary. However, better safe than
sorry.
*/
if ( i_payload_size % 4 )
{
i_payload_padding = 4 - ( i_payload_size % 4 );
i_payload_size += i_payload_padding;
}
/*
Allocate a new RTP p_output block of the appropriate size.
Allow for 12 extra bytes of RTP header.
*/
p_out = block_New( p_stream, 12 + i_payload_size );
if ( i_payload_padding )
{
/*
The padding is required to be a zero followed by all 1s.
*/
char c_first_pad, c_remaining_pad;
c_first_pad = 0x7F;
c_remaining_pad = 0xFF;
/*
Allow for 12 bytes before the i_data_size because
of the expected RTP header added during
rtp_packetize_common.
*/
p_out->p_buffer[12 + i_data_size] = c_first_pad;
switch (i_payload_padding)
{
case 2:
p_out->p_buffer[12 + i_data_size + 1] = c_remaining_pad;
break;
case 3:
p_out->p_buffer[12 + i_data_size + 1] = c_remaining_pad;
p_out->p_buffer[12 + i_data_size + 2] = c_remaining_pad;
break;
}
}
/* Add the RTP header to our p_output buffer. */
rtp_packetize_common( id, p_out, 0, (in->i_pts > 0 ? in->i_pts : in->i_dts) );
/* Copy the Speex payload to the p_output buffer */
memcpy( &p_out->p_buffer[12], p_buffer, i_data_size );
p_out->i_buffer = 12 + i_payload_size;
p_out->i_dts = in->i_dts;
p_out->i_length = in->i_length;
/* Queue the buffer for actual transmission. */
rtp_packetize_send( id, p_out );
return VLC_SUCCESS;
}
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