0,0 → 1,65 |
/* |
* RTP packetization for AMR audio |
* Copyright (c) 2007 Luca Abeni |
* Copyright (c) 2009 Martin Storsjo |
* |
* 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 "avformat.h" |
#include "rtpenc.h" |
|
/** |
* Packetize AMR frames into RTP packets according to RFC 3267, |
* in octet-aligned mode. |
*/ |
void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size) |
{ |
RTPMuxContext *s = s1->priv_data; |
int max_header_toc_size = 1 + s->max_frames_per_packet; |
uint8_t *p; |
int len; |
|
/* Test if the packet must be sent. */ |
len = s->buf_ptr - s->buf; |
if (s->num_frames == s->max_frames_per_packet || (len && len + size - 1 > s->max_payload_size)) { |
int header_size = s->num_frames + 1; |
p = s->buf + max_header_toc_size - header_size; |
if (p != s->buf) |
memmove(p, s->buf, header_size); |
|
ff_rtp_send_data(s1, p, s->buf_ptr - p, 1); |
|
s->num_frames = 0; |
} |
|
if (!s->num_frames) { |
s->buf[0] = 0xf0; |
s->buf_ptr = s->buf + max_header_toc_size; |
s->timestamp = s->cur_timestamp; |
} else { |
/* Mark the previous TOC entry as having more entries following. */ |
s->buf[1 + s->num_frames - 1] |= 0x80; |
} |
|
/* Copy the frame type and quality bits. */ |
s->buf[1 + s->num_frames++] = buff[0] & 0x7C; |
buff++; |
size--; |
memcpy(s->buf_ptr, buff, size); |
s->buf_ptr += size; |
} |