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#define MAX_FRAMES_PER_PACKET (s->max_frames_per_packet ? s->max_frames_per_packet : 5) 25#define MAX_AU_HEADERS_SIZE (2 + 2 * MAX_FRAMES_PER_PACKET) 26 27void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size) 28{ 29 RTPMuxContext *s = s1->priv_data; 30 int len, max_packet_size; 31 uint8_t *p; 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) > max_packet_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 * 8) & 0xFF) >> 8; 51 p[1] = (au_size * 8) & 0xFF; 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 if (s->buf_ptr != s->buf + MAX_AU_HEADERS_SIZE) { 70 av_log(s1, AV_LOG_ERROR, "Strange...\n"); 71 av_abort(); 72 } 73 max_packet_size = s->max_payload_size - 4; 74 p = s->buf; 75 p[0] = 0; 76 p[1] = 16; 77 while (size > 0) { 78 len = FFMIN(size, max_packet_size); 79 p[2] = len >> 5; 80 p[3] = (size & 0x1F) << 3; 81 memcpy(p + 4, buff, len); 82 ff_rtp_send_data(s1, p, len + 4, len == size); 83 size -= len; 84 buff += len; 85 } 86 } 87} 88