| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTSP muxer | ||
| 3 | * Copyright (c) 2010 Martin Storsjo | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "avformat.h" | ||
| 23 | |||
| 24 | #if HAVE_POLL_H | ||
| 25 | #include <poll.h> | ||
| 26 | #endif | ||
| 27 | #include "mux.h" | ||
| 28 | #include "network.h" | ||
| 29 | #include "os_support.h" | ||
| 30 | #include "rtsp.h" | ||
| 31 | #include "internal.h" | ||
| 32 | #include "avio_internal.h" | ||
| 33 | #include "libavutil/intreadwrite.h" | ||
| 34 | #include "libavutil/avstring.h" | ||
| 35 | #include "libavutil/mem.h" | ||
| 36 | #include "libavutil/time.h" | ||
| 37 | #include "url.h" | ||
| 38 | |||
| 39 | |||
| 40 | static const AVClass rtsp_muxer_class = { | ||
| 41 | .class_name = "RTSP muxer", | ||
| 42 | .item_name = av_default_item_name, | ||
| 43 | .option = ff_rtsp_options, | ||
| 44 | .version = LIBAVUTIL_VERSION_INT, | ||
| 45 | }; | ||
| 46 | |||
| 47 | ✗ | int ff_rtsp_setup_output_streams(AVFormatContext *s, const char *addr) | |
| 48 | { | ||
| 49 | ✗ | RTSPState *rt = s->priv_data; | |
| 50 | ✗ | RTSPMessageHeader reply1, *reply = &reply1; | |
| 51 | int i; | ||
| 52 | char *sdp; | ||
| 53 | AVFormatContext sdp_ctx, *ctx_array[1]; | ||
| 54 | char url[MAX_URL_SIZE]; | ||
| 55 | |||
| 56 | ✗ | if (s->start_time_realtime == 0 || s->start_time_realtime == AV_NOPTS_VALUE) | |
| 57 | ✗ | s->start_time_realtime = av_gettime(); | |
| 58 | |||
| 59 | /* Announce the stream */ | ||
| 60 | ✗ | sdp = av_mallocz(SDP_MAX_SIZE); | |
| 61 | ✗ | if (!sdp) | |
| 62 | ✗ | return AVERROR(ENOMEM); | |
| 63 | /* We create the SDP based on the RTSP AVFormatContext where we | ||
| 64 | * aren't allowed to change the filename field. (We create the SDP | ||
| 65 | * based on the RTSP context since the contexts for the RTP streams | ||
| 66 | * don't exist yet.) In order to specify a custom URL with the actual | ||
| 67 | * peer IP instead of the originally specified hostname, we create | ||
| 68 | * a temporary copy of the AVFormatContext, where the custom URL is set. | ||
| 69 | * | ||
| 70 | * FIXME: Create the SDP without copying the AVFormatContext. | ||
| 71 | * This either requires setting up the RTP stream AVFormatContexts | ||
| 72 | * already here (complicating things immensely) or getting a more | ||
| 73 | * flexible SDP creation interface. | ||
| 74 | */ | ||
| 75 | ✗ | sdp_ctx = *s; | |
| 76 | ✗ | sdp_ctx.url = url; | |
| 77 | ✗ | ff_url_join(url, sizeof(url), | |
| 78 | "rtsp", NULL, addr, -1, NULL); | ||
| 79 | ✗ | ctx_array[0] = &sdp_ctx; | |
| 80 | ✗ | if (av_sdp_create(ctx_array, 1, sdp, SDP_MAX_SIZE)) { | |
| 81 | ✗ | av_free(sdp); | |
| 82 | ✗ | return AVERROR_INVALIDDATA; | |
| 83 | } | ||
| 84 | ✗ | av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp); | |
| 85 | ✗ | ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri, | |
| 86 | "Content-Type: application/sdp\r\n", | ||
| 87 | ✗ | reply, NULL, sdp, strlen(sdp)); | |
| 88 | ✗ | av_free(sdp); | |
| 89 | ✗ | if (reply->status_code != RTSP_STATUS_OK) | |
| 90 | ✗ | return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA); | |
| 91 | |||
| 92 | /* Set up the RTSPStreams for each AVStream */ | ||
| 93 | ✗ | for (i = 0; i < s->nb_streams; i++) { | |
| 94 | RTSPStream *rtsp_st; | ||
| 95 | |||
| 96 | ✗ | rtsp_st = av_mallocz(sizeof(RTSPStream)); | |
| 97 | ✗ | if (!rtsp_st) | |
| 98 | ✗ | return AVERROR(ENOMEM); | |
| 99 | ✗ | dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st); | |
| 100 | |||
| 101 | ✗ | rtsp_st->stream_index = i; | |
| 102 | |||
| 103 | ✗ | av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url)); | |
| 104 | /* Note, this must match the relative uri set in the sdp content */ | ||
| 105 | ✗ | av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url), | |
| 106 | "/streamid=%d", i); | ||
| 107 | } | ||
| 108 | |||
| 109 | ✗ | return 0; | |
| 110 | } | ||
| 111 | |||
| 112 | ✗ | static int rtsp_write_record(AVFormatContext *s) | |
| 113 | { | ||
| 114 | ✗ | RTSPState *rt = s->priv_data; | |
| 115 | ✗ | RTSPMessageHeader reply1, *reply = &reply1; | |
| 116 | char cmd[MAX_URL_SIZE]; | ||
| 117 | |||
| 118 | ✗ | snprintf(cmd, sizeof(cmd), | |
| 119 | "Range: npt=0.000-\r\n"); | ||
| 120 | ✗ | ff_rtsp_send_cmd(s, "RECORD", rt->control_uri, cmd, reply, NULL); | |
| 121 | ✗ | if (reply->status_code != RTSP_STATUS_OK) | |
| 122 | ✗ | return ff_rtsp_averror(reply->status_code, -1); | |
| 123 | ✗ | rt->state = RTSP_STATE_STREAMING; | |
| 124 | ✗ | return 0; | |
| 125 | } | ||
| 126 | |||
| 127 | ✗ | static int rtsp_write_header(AVFormatContext *s) | |
| 128 | { | ||
| 129 | int ret; | ||
| 130 | |||
| 131 | ✗ | ret = ff_rtsp_connect(s); | |
| 132 | ✗ | if (ret) | |
| 133 | ✗ | return ret; | |
| 134 | |||
| 135 | ✗ | if (rtsp_write_record(s) < 0) { | |
| 136 | ✗ | ff_rtsp_close_streams(s); | |
| 137 | ✗ | ff_rtsp_close_connections(s); | |
| 138 | ✗ | return AVERROR_INVALIDDATA; | |
| 139 | } | ||
| 140 | ✗ | return 0; | |
| 141 | } | ||
| 142 | |||
| 143 | ✗ | int ff_rtsp_tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st) | |
| 144 | { | ||
| 145 | ✗ | RTSPState *rt = s->priv_data; | |
| 146 | ✗ | AVFormatContext *rtpctx = rtsp_st->transport_priv; | |
| 147 | uint8_t *buf, *ptr; | ||
| 148 | int size; | ||
| 149 | uint8_t *interleave_header, *interleaved_packet; | ||
| 150 | |||
| 151 | ✗ | size = avio_close_dyn_buf(rtpctx->pb, &buf); | |
| 152 | ✗ | rtpctx->pb = NULL; | |
| 153 | ✗ | ptr = buf; | |
| 154 | ✗ | while (size > 4) { | |
| 155 | ✗ | uint32_t packet_len = AV_RB32(ptr); | |
| 156 | int id; | ||
| 157 | /* The interleaving header is exactly 4 bytes, which happens to be | ||
| 158 | * the same size as the packet length header from | ||
| 159 | * ffio_open_dyn_packet_buf. So by writing the interleaving header | ||
| 160 | * over these bytes, we get a consecutive interleaved packet | ||
| 161 | * that can be written in one call. */ | ||
| 162 | ✗ | interleaved_packet = interleave_header = ptr; | |
| 163 | ✗ | ptr += 4; | |
| 164 | ✗ | size -= 4; | |
| 165 | ✗ | if (packet_len > size || packet_len < 2) | |
| 166 | break; | ||
| 167 | ✗ | if (RTP_PT_IS_RTCP(ptr[1])) | |
| 168 | ✗ | id = rtsp_st->interleaved_max; /* RTCP */ | |
| 169 | else | ||
| 170 | ✗ | id = rtsp_st->interleaved_min; /* RTP */ | |
| 171 | ✗ | interleave_header[0] = '$'; | |
| 172 | ✗ | interleave_header[1] = id; | |
| 173 | ✗ | AV_WB16(interleave_header + 2, packet_len); | |
| 174 | ✗ | ffurl_write(rt->rtsp_hd_out, interleaved_packet, 4 + packet_len); | |
| 175 | ✗ | ptr += packet_len; | |
| 176 | ✗ | size -= packet_len; | |
| 177 | } | ||
| 178 | ✗ | av_free(buf); | |
| 179 | ✗ | return ffio_open_dyn_packet_buf(&rtpctx->pb, rt->pkt_size); | |
| 180 | } | ||
| 181 | |||
| 182 | ✗ | static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt) | |
| 183 | { | ||
| 184 | ✗ | RTSPState *rt = s->priv_data; | |
| 185 | RTSPStream *rtsp_st; | ||
| 186 | int n; | ||
| 187 | ✗ | struct pollfd p = {ffurl_get_file_handle(rt->rtsp_hd), POLLIN, 0}; | |
| 188 | AVFormatContext *rtpctx; | ||
| 189 | int ret; | ||
| 190 | |||
| 191 | while (1) { | ||
| 192 | ✗ | n = poll(&p, 1, 0); | |
| 193 | ✗ | if (n <= 0) | |
| 194 | ✗ | break; | |
| 195 | ✗ | if (p.revents & POLLIN) { | |
| 196 | RTSPMessageHeader reply; | ||
| 197 | |||
| 198 | /* Don't let ff_rtsp_read_reply handle interleaved packets, | ||
| 199 | * since it would block and wait for an RTSP reply on the socket | ||
| 200 | * (which may not be coming any time soon) if it handles | ||
| 201 | * interleaved packets internally. */ | ||
| 202 | ✗ | ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL); | |
| 203 | ✗ | if (ret < 0) | |
| 204 | ✗ | return AVERROR(EPIPE); | |
| 205 | ✗ | if (ret == 1) { | |
| 206 | ✗ | ret = ff_rtsp_skip_packet(s); | |
| 207 | ✗ | if (ret < 0) | |
| 208 | ✗ | return ret; | |
| 209 | } | ||
| 210 | /* XXX: parse message */ | ||
| 211 | ✗ | if (rt->state != RTSP_STATE_STREAMING) | |
| 212 | ✗ | return AVERROR(EPIPE); | |
| 213 | } | ||
| 214 | } | ||
| 215 | |||
| 216 | ✗ | if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams) | |
| 217 | ✗ | return AVERROR_INVALIDDATA; | |
| 218 | ✗ | rtsp_st = rt->rtsp_streams[pkt->stream_index]; | |
| 219 | ✗ | rtpctx = rtsp_st->transport_priv; | |
| 220 | |||
| 221 | ✗ | ret = ff_write_chained(rtpctx, 0, pkt, s, 0); | |
| 222 | /* ff_write_chained does all the RTP packetization. If using TCP as | ||
| 223 | * transport, rtpctx->pb is only a dyn_packet_buf that queues up the | ||
| 224 | * packets, so we need to send them out on the TCP connection separately. | ||
| 225 | */ | ||
| 226 | ✗ | if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) | |
| 227 | ✗ | ret = ff_rtsp_tcp_write_packet(s, rtsp_st); | |
| 228 | ✗ | return ret; | |
| 229 | } | ||
| 230 | |||
| 231 | ✗ | static int rtsp_write_close(AVFormatContext *s) | |
| 232 | { | ||
| 233 | ✗ | RTSPState *rt = s->priv_data; | |
| 234 | |||
| 235 | // If we want to send RTCP_BYE packets, these are sent by av_write_trailer. | ||
| 236 | // Thus call this on all streams before doing the teardown. This is | ||
| 237 | // done within ff_rtsp_undo_setup. | ||
| 238 | ✗ | ff_rtsp_undo_setup(s, 1); | |
| 239 | |||
| 240 | ✗ | ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL); | |
| 241 | |||
| 242 | ✗ | ff_rtsp_close_streams(s); | |
| 243 | ✗ | ff_rtsp_close_connections(s); | |
| 244 | ✗ | ff_network_close(); | |
| 245 | ✗ | return 0; | |
| 246 | } | ||
| 247 | |||
| 248 | const FFOutputFormat ff_rtsp_muxer = { | ||
| 249 | .p.name = "rtsp", | ||
| 250 | .p.long_name = NULL_IF_CONFIG_SMALL("RTSP output"), | ||
| 251 | .priv_data_size = sizeof(RTSPState), | ||
| 252 | .p.audio_codec = AV_CODEC_ID_AAC, | ||
| 253 | .p.video_codec = AV_CODEC_ID_MPEG4, | ||
| 254 | .write_header = rtsp_write_header, | ||
| 255 | .write_packet = rtsp_write_packet, | ||
| 256 | .write_trailer = rtsp_write_close, | ||
| 257 | .p.flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER, | ||
| 258 | .p.priv_class = &rtsp_muxer_class, | ||
| 259 | }; | ||
| 260 |