0,0 → 1,117 |
/* |
* RTP packetization for MPEG video |
* Copyright (c) 2002 Fabrice Bellard |
* Copyright (c) 2007 Luca Abeni |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg 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 |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
#include "libavcodec/internal.h" |
#include "avformat.h" |
#include "rtpenc.h" |
|
/* NOTE: a single frame must be passed with sequence header if |
needed. XXX: use slices. */ |
void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size) |
{ |
RTPMuxContext *s = s1->priv_data; |
int len, h, max_packet_size; |
uint8_t *q; |
const uint8_t *end = buf1 + size; |
int begin_of_slice, end_of_slice, frame_type, temporal_reference; |
|
max_packet_size = s->max_payload_size; |
begin_of_slice = 1; |
end_of_slice = 0; |
frame_type = 0; |
temporal_reference = 0; |
|
while (size > 0) { |
int begin_of_sequence; |
|
begin_of_sequence = 0; |
len = max_packet_size - 4; |
|
if (len >= size) { |
len = size; |
end_of_slice = 1; |
} else { |
const uint8_t *r, *r1; |
int start_code; |
|
r1 = buf1; |
while (1) { |
start_code = -1; |
r = avpriv_find_start_code(r1, end, &start_code); |
if((start_code & 0xFFFFFF00) == 0x100) { |
/* New start code found */ |
if (start_code == 0x100) { |
frame_type = (r[1] & 0x38) >> 3; |
temporal_reference = (int)r[0] << 2 | r[1] >> 6; |
} |
if (start_code == 0x1B8) { |
begin_of_sequence = 1; |
} |
|
if (r - buf1 - 4 <= len) { |
/* The current slice fits in the packet */ |
if (begin_of_slice == 0) { |
/* no slice at the beginning of the packet... */ |
end_of_slice = 1; |
len = r - buf1 - 4; |
break; |
} |
r1 = r; |
} else { |
if ((r1 - buf1 > 4) && (r - r1 < max_packet_size)) { |
len = r1 - buf1 - 4; |
end_of_slice = 1; |
} |
break; |
} |
} else { |
break; |
} |
} |
} |
|
h = 0; |
h |= temporal_reference << 16; |
h |= begin_of_sequence << 13; |
h |= begin_of_slice << 12; |
h |= end_of_slice << 11; |
h |= frame_type << 8; |
|
q = s->buf; |
*q++ = h >> 24; |
*q++ = h >> 16; |
*q++ = h >> 8; |
*q++ = h; |
|
memcpy(q, buf1, len); |
q += len; |
|
/* 90kHz time stamp */ |
s->timestamp = s->cur_timestamp; |
ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size)); |
|
buf1 += len; |
size -= len; |
begin_of_slice = end_of_slice; |
end_of_slice = 0; |
} |
} |