| 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 | |
| 25 | void 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 | } |