| /* |
| * 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 "libavutil/intreadwrite.h" |
| |
| #include "avformat.h" |
| #include "rtpenc.h" |
| |
| |
| void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size) |
| { |
| RTPMuxContext *s = s1->priv_data; |
| AVStream *st = s1->streams[0]; |
| const int max_au_headers_size = 2 + 2 * s->max_frames_per_packet; |
| int len, max_packet_size = s->max_payload_size - max_au_headers_size; |
| uint8_t *p; |
| |
| /* skip ADTS header, if present */ |
| if ((s1->streams[0]->codecpar->extradata_size) == 0) { |
| size -= 7; |
| buff += 7; |
| } |
| |
| /* test if the packet must be sent */ |
| len = (s->buf_ptr - s->buf); |
| if (s->num_frames && |
| (s->num_frames == s->max_frames_per_packet || |
| (len + size) > s->max_payload_size || |
| av_compare_ts(s->cur_timestamp - s->timestamp, st->time_base, |
| s1->max_delay, AV_TIME_BASE_Q) >= 0)) { |
| int au_size = s->num_frames * 2; |
| |
| p = s->buf + max_au_headers_size - au_size - 2; |
| if (p != s->buf) { |
| memmove(p + 2, s->buf + 2, au_size); |
| } |
| /* Write the AU header size */ |
| AV_WB16(p, au_size * 8); |
| |
| ff_rtp_send_data(s1, p, s->buf_ptr - p, 1); |
| |
| s->num_frames = 0; |
| } |
| if (s->num_frames == 0) { |
| s->buf_ptr = s->buf + max_au_headers_size; |
| s->timestamp = s->cur_timestamp; |
| } |
| |
| if (size <= max_packet_size) { |
| p = s->buf + s->num_frames++ * 2 + 2; |
| AV_WB16(p, size * 8); |
| memcpy(s->buf_ptr, buff, size); |
| s->buf_ptr += size; |
| } else { |
| int au_size = size; |
| |
| max_packet_size = s->max_payload_size - 4; |
| p = s->buf; |
| AV_WB16(p, 2 * 8); |
| while (size > 0) { |
| len = FFMIN(size, max_packet_size); |
| AV_WB16(&p[2], au_size * 8); |
| memcpy(p + 4, buff, len); |
| ff_rtp_send_data(s1, p, len + 4, len == size); |
| size -= len; |
| buff += len; |
| } |
| } |
| } |