yading@11: /* yading@11: * copyright (c) 2007 Luca Abeni yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: #include "avformat.h" yading@11: #include "rtpenc.h" yading@11: yading@11: yading@11: void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size) yading@11: { yading@11: RTPMuxContext *s = s1->priv_data; yading@11: int len, max_packet_size; yading@11: uint8_t *p; yading@11: const int max_frames_per_packet = s->max_frames_per_packet ? s->max_frames_per_packet : 5; yading@11: const int max_au_headers_size = 2 + 2 * max_frames_per_packet; yading@11: yading@11: /* skip ADTS header, if present */ yading@11: if ((s1->streams[0]->codec->extradata_size) == 0) { yading@11: size -= 7; yading@11: buff += 7; yading@11: } yading@11: max_packet_size = s->max_payload_size - max_au_headers_size; yading@11: yading@11: /* test if the packet must be sent */ yading@11: len = (s->buf_ptr - s->buf); yading@11: if ((s->num_frames == max_frames_per_packet) || (len && (len + size) > s->max_payload_size)) { yading@11: int au_size = s->num_frames * 2; yading@11: yading@11: p = s->buf + max_au_headers_size - au_size - 2; yading@11: if (p != s->buf) { yading@11: memmove(p + 2, s->buf + 2, au_size); yading@11: } yading@11: /* Write the AU header size */ yading@11: p[0] = au_size >> 5; yading@11: p[1] = (au_size & 0x1F) << 3; yading@11: yading@11: ff_rtp_send_data(s1, p, s->buf_ptr - p, 1); yading@11: yading@11: s->num_frames = 0; yading@11: } yading@11: if (s->num_frames == 0) { yading@11: s->buf_ptr = s->buf + max_au_headers_size; yading@11: s->timestamp = s->cur_timestamp; yading@11: } yading@11: yading@11: if (size <= max_packet_size) { yading@11: p = s->buf + s->num_frames++ * 2 + 2; yading@11: *p++ = size >> 5; yading@11: *p = (size & 0x1F) << 3; yading@11: memcpy(s->buf_ptr, buff, size); yading@11: s->buf_ptr += size; yading@11: } else { yading@11: int au_size = size; yading@11: yading@11: max_packet_size = s->max_payload_size - 4; yading@11: p = s->buf; yading@11: p[0] = 0; yading@11: p[1] = 16; yading@11: while (size > 0) { yading@11: len = FFMIN(size, max_packet_size); yading@11: p[2] = au_size >> 5; yading@11: p[3] = (au_size & 0x1F) << 3; yading@11: memcpy(p + 4, buff, len); yading@11: ff_rtp_send_data(s1, p, len + 4, len == size); yading@11: size -= len; yading@11: buff += len; yading@11: } yading@11: } yading@11: }