Libav
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00001 /* 00002 * RTP packetization for H.264 (RFC3984) 00003 * Copyright (c) 2008 Luca Abeni 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00028 #include "avformat.h" 00029 #include "avc.h" 00030 #include "rtpenc.h" 00031 00032 static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last) 00033 { 00034 RTPMuxContext *s = s1->priv_data; 00035 00036 av_log(s1, AV_LOG_DEBUG, "Sending NAL %x of len %d M=%d\n", buf[0] & 0x1F, size, last); 00037 if (size <= s->max_payload_size) { 00038 ff_rtp_send_data(s1, buf, size, last); 00039 } else { 00040 uint8_t type = buf[0] & 0x1F; 00041 uint8_t nri = buf[0] & 0x60; 00042 00043 av_log(s1, AV_LOG_DEBUG, "NAL size %d > %d\n", size, s->max_payload_size); 00044 s->buf[0] = 28; /* FU Indicator; Type = 28 ---> FU-A */ 00045 s->buf[0] |= nri; 00046 s->buf[1] = type; 00047 s->buf[1] |= 1 << 7; 00048 buf += 1; 00049 size -= 1; 00050 while (size + 2 > s->max_payload_size) { 00051 memcpy(&s->buf[2], buf, s->max_payload_size - 2); 00052 ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0); 00053 buf += s->max_payload_size - 2; 00054 size -= s->max_payload_size - 2; 00055 s->buf[1] &= ~(1 << 7); 00056 } 00057 s->buf[1] |= 1 << 6; 00058 memcpy(&s->buf[2], buf, size); 00059 ff_rtp_send_data(s1, s->buf, size + 2, last); 00060 } 00061 } 00062 00063 void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size) 00064 { 00065 const uint8_t *r; 00066 RTPMuxContext *s = s1->priv_data; 00067 00068 s->timestamp = s->cur_timestamp; 00069 r = ff_avc_find_startcode(buf1, buf1 + size); 00070 while (r < buf1 + size) { 00071 const uint8_t *r1; 00072 00073 while(!*(r++)); 00074 r1 = ff_avc_find_startcode(r, buf1 + size); 00075 nal_send(s1, r, r1 - r, (r1 == buf1 + size)); 00076 r = r1; 00077 } 00078 }