Libav
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00001 /* 00002 * RTSP muxer 00003 * Copyright (c) 2010 Martin Storsjo 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 00022 #include "avformat.h" 00023 00024 #include <sys/time.h> 00025 #if HAVE_SYS_SELECT_H 00026 #include <sys/select.h> 00027 #endif 00028 #include "network.h" 00029 #include "rtsp.h" 00030 #include <libavutil/intreadwrite.h> 00031 00032 static int rtsp_write_record(AVFormatContext *s) 00033 { 00034 RTSPState *rt = s->priv_data; 00035 RTSPMessageHeader reply1, *reply = &reply1; 00036 char cmd[1024]; 00037 00038 snprintf(cmd, sizeof(cmd), 00039 "Range: npt=%0.3f-\r\n", 00040 (double) 0); 00041 ff_rtsp_send_cmd(s, "RECORD", rt->control_uri, cmd, reply, NULL); 00042 if (reply->status_code != RTSP_STATUS_OK) 00043 return -1; 00044 rt->state = RTSP_STATE_STREAMING; 00045 return 0; 00046 } 00047 00048 static int rtsp_write_header(AVFormatContext *s) 00049 { 00050 RTSPState *rt = s->priv_data; 00051 int ret; 00052 00053 ret = ff_rtsp_connect(s); 00054 if (ret) 00055 return ret; 00056 00057 if (rtsp_write_record(s) < 0) { 00058 ff_rtsp_close_streams(s); 00059 url_close(rt->rtsp_hd); 00060 return AVERROR_INVALIDDATA; 00061 } 00062 return 0; 00063 } 00064 00065 static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st) 00066 { 00067 RTSPState *rt = s->priv_data; 00068 AVFormatContext *rtpctx = rtsp_st->transport_priv; 00069 uint8_t *buf, *ptr; 00070 int size; 00071 uint8_t interleave_header[4]; 00072 00073 size = url_close_dyn_buf(rtpctx->pb, &buf); 00074 ptr = buf; 00075 while (size > 4) { 00076 uint32_t packet_len = AV_RB32(ptr); 00077 int id; 00078 ptr += 4; 00079 size -= 4; 00080 if (packet_len > size || packet_len < 2) 00081 break; 00082 if (ptr[1] >= 200 && ptr[1] <= 204) 00083 id = rtsp_st->interleaved_max; /* RTCP */ 00084 else 00085 id = rtsp_st->interleaved_min; /* RTP */ 00086 interleave_header[0] = '$'; 00087 interleave_header[1] = id; 00088 AV_WB16(interleave_header + 2, packet_len); 00089 url_write(rt->rtsp_hd, interleave_header, 4); 00090 url_write(rt->rtsp_hd, ptr, packet_len); 00091 ptr += packet_len; 00092 size -= packet_len; 00093 } 00094 av_free(buf); 00095 url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE); 00096 return 0; 00097 } 00098 00099 static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt) 00100 { 00101 RTSPState *rt = s->priv_data; 00102 RTSPStream *rtsp_st; 00103 fd_set rfds; 00104 int n, tcp_fd; 00105 struct timeval tv; 00106 AVFormatContext *rtpctx; 00107 AVPacket local_pkt; 00108 int ret; 00109 00110 tcp_fd = url_get_file_handle(rt->rtsp_hd); 00111 00112 while (1) { 00113 FD_ZERO(&rfds); 00114 FD_SET(tcp_fd, &rfds); 00115 tv.tv_sec = 0; 00116 tv.tv_usec = 0; 00117 n = select(tcp_fd + 1, &rfds, NULL, NULL, &tv); 00118 if (n <= 0) 00119 break; 00120 if (FD_ISSET(tcp_fd, &rfds)) { 00121 RTSPMessageHeader reply; 00122 00123 /* Don't let ff_rtsp_read_reply handle interleaved packets, 00124 * since it would block and wait for an RTSP reply on the socket 00125 * (which may not be coming any time soon) if it handles 00126 * interleaved packets internally. */ 00127 ret = ff_rtsp_read_reply(s, &reply, NULL, 1); 00128 if (ret < 0) 00129 return AVERROR(EPIPE); 00130 if (ret == 1) 00131 ff_rtsp_skip_packet(s); 00132 /* XXX: parse message */ 00133 if (rt->state != RTSP_STATE_STREAMING) 00134 return AVERROR(EPIPE); 00135 } 00136 } 00137 00138 if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams) 00139 return AVERROR_INVALIDDATA; 00140 rtsp_st = rt->rtsp_streams[pkt->stream_index]; 00141 rtpctx = rtsp_st->transport_priv; 00142 00143 /* Use a local packet for writing to the chained muxer, otherwise 00144 * the internal stream_index = 0 becomes visible to the muxer user. */ 00145 local_pkt = *pkt; 00146 local_pkt.stream_index = 0; 00147 ret = av_write_frame(rtpctx, &local_pkt); 00148 /* av_write_frame does all the RTP packetization. If using TCP as 00149 * transport, rtpctx->pb is only a dyn_packet_buf that queues up the 00150 * packets, so we need to send them out on the TCP connection separately. 00151 */ 00152 if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) 00153 ret = tcp_write_packet(s, rtsp_st); 00154 return ret; 00155 } 00156 00157 static int rtsp_write_close(AVFormatContext *s) 00158 { 00159 RTSPState *rt = s->priv_data; 00160 00161 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL); 00162 00163 ff_rtsp_close_streams(s); 00164 url_close(rt->rtsp_hd); 00165 ff_network_close(); 00166 return 0; 00167 } 00168 00169 AVOutputFormat rtsp_muxer = { 00170 "rtsp", 00171 NULL_IF_CONFIG_SMALL("RTSP output format"), 00172 NULL, 00173 NULL, 00174 sizeof(RTSPState), 00175 CODEC_ID_PCM_MULAW, 00176 CODEC_ID_NONE, 00177 rtsp_write_header, 00178 rtsp_write_packet, 00179 rtsp_write_close, 00180 .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER, 00181 }; 00182