1/* 2 * RTP Packetization of MPEG-4 Audio (RFC 3016) 3 * Copyright (c) 2011 Juan Carlos Rodriguez <ing.juancarlosrodriguez@hotmail.com> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "avformat.h" 23#include "rtpenc.h" 24 25void ff_rtp_send_latm(AVFormatContext *s1, const uint8_t *buff, int size) 26{ 27 /* MP4A-LATM 28 * The RTP payload format specification is described in RFC 3016 29 * The encoding specifications are provided in ISO/IEC 14496-3 */ 30 31 RTPMuxContext *s = s1->priv_data; 32 int header_size; 33 int offset = 0; 34 int len = 0; 35 36 /* skip ADTS header, if present */ 37 if ((s1->streams[0]->codec->extradata_size) == 0) { 38 size -= 7; 39 buff += 7; 40 } 41 42 /* PayloadLengthInfo() */ 43 header_size = size/0xFF + 1; 44 memset(s->buf, 0xFF, header_size - 1); 45 s->buf[header_size - 1] = size % 0xFF; 46 47 s->timestamp = s->cur_timestamp; 48 49 /* PayloadMux() */ 50 while (size > 0) { 51 len = FFMIN(size, s->max_payload_size - (!offset ? header_size : 0)); 52 size -= len; 53 if (!offset) { 54 memcpy(s->buf + header_size, buff, len); 55 ff_rtp_send_data(s1, s->buf, header_size + len, !size); 56 } else { 57 ff_rtp_send_data(s1, buff + offset, len, !size); 58 } 59 offset += len; 60 } 61} 62