| 1 | /* |
| 2 | * copyright (c) 2007 Luca Abeni |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include "avformat.h" |
| 22 | #include "rtpenc.h" |
| 23 | |
| 24 | |
| 25 | void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size) |
| 26 | { |
| 27 | RTPMuxContext *s = s1->priv_data; |
| 28 | int len, max_packet_size; |
| 29 | uint8_t *p; |
| 30 | const int max_frames_per_packet = s->max_frames_per_packet ? s->max_frames_per_packet : 5; |
| 31 | const int max_au_headers_size = 2 + 2 * max_frames_per_packet; |
| 32 | |
| 33 | /* skip ADTS header, if present */ |
| 34 | if ((s1->streams[0]->codec->extradata_size) == 0) { |
| 35 | size -= 7; |
| 36 | buff += 7; |
| 37 | } |
| 38 | max_packet_size = s->max_payload_size - max_au_headers_size; |
| 39 | |
| 40 | /* test if the packet must be sent */ |
| 41 | len = (s->buf_ptr - s->buf); |
| 42 | if ((s->num_frames == max_frames_per_packet) || (len && (len + size) > s->max_payload_size)) { |
| 43 | int au_size = s->num_frames * 2; |
| 44 | |
| 45 | p = s->buf + max_au_headers_size - au_size - 2; |
| 46 | if (p != s->buf) { |
| 47 | memmove(p + 2, s->buf + 2, au_size); |
| 48 | } |
| 49 | /* Write the AU header size */ |
| 50 | p[0] = au_size >> 5; |
| 51 | p[1] = (au_size & 0x1F) << 3; |
| 52 | |
| 53 | ff_rtp_send_data(s1, p, s->buf_ptr - p, 1); |
| 54 | |
| 55 | s->num_frames = 0; |
| 56 | } |
| 57 | if (s->num_frames == 0) { |
| 58 | s->buf_ptr = s->buf + max_au_headers_size; |
| 59 | s->timestamp = s->cur_timestamp; |
| 60 | } |
| 61 | |
| 62 | if (size <= max_packet_size) { |
| 63 | p = s->buf + s->num_frames++ * 2 + 2; |
| 64 | *p++ = size >> 5; |
| 65 | *p = (size & 0x1F) << 3; |
| 66 | memcpy(s->buf_ptr, buff, size); |
| 67 | s->buf_ptr += size; |
| 68 | } else { |
| 69 | int au_size = size; |
| 70 | |
| 71 | max_packet_size = s->max_payload_size - 4; |
| 72 | p = s->buf; |
| 73 | p[0] = 0; |
| 74 | p[1] = 16; |
| 75 | while (size > 0) { |
| 76 | len = FFMIN(size, max_packet_size); |
| 77 | p[2] = au_size >> 5; |
| 78 | p[3] = (au_size & 0x1F) << 3; |
| 79 | memcpy(p + 4, buff, len); |
| 80 | ff_rtp_send_data(s1, p, len + 4, len == size); |
| 81 | size -= len; |
| 82 | buff += len; |
| 83 | } |
| 84 | } |
| 85 | } |