FFmpeg  4.4.4
rtspenc.c
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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 "network.h"
28 #include "os_support.h"
29 #include "rtsp.h"
30 #include "internal.h"
31 #include "avio_internal.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/time.h"
35 #include "url.h"
36 
37 
38 static const AVClass rtsp_muxer_class = {
39  .class_name = "RTSP muxer",
40  .item_name = av_default_item_name,
41  .option = ff_rtsp_options,
42  .version = LIBAVUTIL_VERSION_INT,
43 };
44 
46 {
47  RTSPState *rt = s->priv_data;
48  RTSPMessageHeader reply1, *reply = &reply1;
49  int i;
50  char *sdp;
51  AVFormatContext sdp_ctx, *ctx_array[1];
52  char url[MAX_URL_SIZE];
53 
54  if (s->start_time_realtime == 0 || s->start_time_realtime == AV_NOPTS_VALUE)
55  s->start_time_realtime = av_gettime();
56 
57  /* Announce the stream */
58  sdp = av_mallocz(SDP_MAX_SIZE);
59  if (!sdp)
60  return AVERROR(ENOMEM);
61  /* We create the SDP based on the RTSP AVFormatContext where we
62  * aren't allowed to change the filename field. (We create the SDP
63  * based on the RTSP context since the contexts for the RTP streams
64  * don't exist yet.) In order to specify a custom URL with the actual
65  * peer IP instead of the originally specified hostname, we create
66  * a temporary copy of the AVFormatContext, where the custom URL is set.
67  *
68  * FIXME: Create the SDP without copying the AVFormatContext.
69  * This either requires setting up the RTP stream AVFormatContexts
70  * already here (complicating things immensely) or getting a more
71  * flexible SDP creation interface.
72  */
73  sdp_ctx = *s;
74  sdp_ctx.url = url;
75  ff_url_join(url, sizeof(url),
76  "rtsp", NULL, addr, -1, NULL);
77  ctx_array[0] = &sdp_ctx;
78  if (av_sdp_create(ctx_array, 1, sdp, SDP_MAX_SIZE)) {
79  av_free(sdp);
80  return AVERROR_INVALIDDATA;
81  }
82  av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
84  "Content-Type: application/sdp\r\n",
85  reply, NULL, sdp, strlen(sdp));
86  av_free(sdp);
87  if (reply->status_code != RTSP_STATUS_OK)
89 
90  /* Set up the RTSPStreams for each AVStream */
91  for (i = 0; i < s->nb_streams; i++) {
92  RTSPStream *rtsp_st;
93 
94  rtsp_st = av_mallocz(sizeof(RTSPStream));
95  if (!rtsp_st)
96  return AVERROR(ENOMEM);
97  dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
98 
99  rtsp_st->stream_index = i;
100 
101  av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
102  /* Note, this must match the relative uri set in the sdp content */
103  av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
104  "/streamid=%d", i);
105  }
106 
107  return 0;
108 }
109 
111 {
112  RTSPState *rt = s->priv_data;
113  RTSPMessageHeader reply1, *reply = &reply1;
114  char cmd[MAX_URL_SIZE];
115 
116  snprintf(cmd, sizeof(cmd),
117  "Range: npt=0.000-\r\n");
118  ff_rtsp_send_cmd(s, "RECORD", rt->control_uri, cmd, reply, NULL);
119  if (reply->status_code != RTSP_STATUS_OK)
120  return ff_rtsp_averror(reply->status_code, -1);
122  return 0;
123 }
124 
126 {
127  int ret;
128 
129  ret = ff_rtsp_connect(s);
130  if (ret)
131  return ret;
132 
133  if (rtsp_write_record(s) < 0) {
136  return AVERROR_INVALIDDATA;
137  }
138  return 0;
139 }
140 
142 {
143  RTSPState *rt = s->priv_data;
144  AVFormatContext *rtpctx = rtsp_st->transport_priv;
145  uint8_t *buf, *ptr;
146  int size;
147  uint8_t *interleave_header, *interleaved_packet;
148 
149  size = avio_close_dyn_buf(rtpctx->pb, &buf);
150  rtpctx->pb = NULL;
151  ptr = buf;
152  while (size > 4) {
153  uint32_t packet_len = AV_RB32(ptr);
154  int id;
155  /* The interleaving header is exactly 4 bytes, which happens to be
156  * the same size as the packet length header from
157  * ffio_open_dyn_packet_buf. So by writing the interleaving header
158  * over these bytes, we get a consecutive interleaved packet
159  * that can be written in one call. */
160  interleaved_packet = interleave_header = ptr;
161  ptr += 4;
162  size -= 4;
163  if (packet_len > size || packet_len < 2)
164  break;
165  if (RTP_PT_IS_RTCP(ptr[1]))
166  id = rtsp_st->interleaved_max; /* RTCP */
167  else
168  id = rtsp_st->interleaved_min; /* RTP */
169  interleave_header[0] = '$';
170  interleave_header[1] = id;
171  AV_WB16(interleave_header + 2, packet_len);
172  ffurl_write(rt->rtsp_hd_out, interleaved_packet, 4 + packet_len);
173  ptr += packet_len;
174  size -= packet_len;
175  }
176  av_free(buf);
178 }
179 
181 {
182  RTSPState *rt = s->priv_data;
183  RTSPStream *rtsp_st;
184  int n;
185  struct pollfd p = {ffurl_get_file_handle(rt->rtsp_hd), POLLIN, 0};
186  AVFormatContext *rtpctx;
187  int ret;
188 
189  while (1) {
190  n = poll(&p, 1, 0);
191  if (n <= 0)
192  break;
193  if (p.revents & POLLIN) {
194  RTSPMessageHeader reply;
195 
196  /* Don't let ff_rtsp_read_reply handle interleaved packets,
197  * since it would block and wait for an RTSP reply on the socket
198  * (which may not be coming any time soon) if it handles
199  * interleaved packets internally. */
200  ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
201  if (ret < 0)
202  return AVERROR(EPIPE);
203  if (ret == 1)
205  /* XXX: parse message */
206  if (rt->state != RTSP_STATE_STREAMING)
207  return AVERROR(EPIPE);
208  }
209  }
210 
211  if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams)
212  return AVERROR_INVALIDDATA;
213  rtsp_st = rt->rtsp_streams[pkt->stream_index];
214  rtpctx = rtsp_st->transport_priv;
215 
216  ret = ff_write_chained(rtpctx, 0, pkt, s, 0);
217  /* ff_write_chained does all the RTP packetization. If using TCP as
218  * transport, rtpctx->pb is only a dyn_packet_buf that queues up the
219  * packets, so we need to send them out on the TCP connection separately.
220  */
221  if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP)
222  ret = ff_rtsp_tcp_write_packet(s, rtsp_st);
223  return ret;
224 }
225 
227 {
228  RTSPState *rt = s->priv_data;
229 
230  // If we want to send RTCP_BYE packets, these are sent by av_write_trailer.
231  // Thus call this on all streams before doing the teardown. This is
232  // done within ff_rtsp_undo_setup.
233  ff_rtsp_undo_setup(s, 1);
234 
235  ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
236 
240  return 0;
241 }
242 
244  .name = "rtsp",
245  .long_name = NULL_IF_CONFIG_SMALL("RTSP output"),
246  .priv_data_size = sizeof(RTSPState),
247  .audio_codec = AV_CODEC_ID_AAC,
248  .video_codec = AV_CODEC_ID_MPEG4,
253  .priv_class = &rtsp_muxer_class,
254 };
uint8_t
Main libavformat public API header.
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:461
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
Write size bytes from buf to the resource accessed by h.
Definition: avio.c:418
int ffurl_get_file_handle(URLContext *h)
Return the file descriptor associated with this URL.
Definition: avio.c:623
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1427
int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
Open a write only packetized memory stream with a maximum packet size of 'max_packet_size'.
Definition: aviobuf.c:1387
#define AV_RB32
Definition: intreadwrite.h:130
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define NULL
Definition: coverity.c:32
enum AVCodecID id
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:729
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
@ AV_CODEC_ID_AAC
Definition: codec_id.h:426
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:61
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
Generate an SDP for an RTP session.
Definition: sdp.c:846
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int i
Definition: input.c:407
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt, AVFormatContext *src, int interleave)
Write a packet to another muxer than the one the user originally intended.
Definition: mux.c:1328
#define dynarray_add(tab, nb_ptr, elem)
Definition: internal.h:355
#define MAX_URL_SIZE
Definition: internal.h:30
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
void ff_network_close(void)
Definition: network.c:116
miscellaneous OS support macros and functions.
#define RTP_PT_IS_RTCP(x)
Definition: rtp.h:110
const AVOption ff_rtsp_options[]
Definition: rtsp.c:80
void ff_rtsp_close_streams(AVFormatContext *s)
Close and free all streams within the RTSP (de)muxer.
Definition: rtsp.c:792
void ff_rtsp_undo_setup(AVFormatContext *s, int send_packets)
Undo the effect of ff_rtsp_make_setup_request, close the transport_priv and rtp_handle fields.
Definition: rtsp.c:760
void ff_rtsp_skip_packet(AVFormatContext *s)
Skip a RTP/TCP interleaved packet.
int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url, const char *headers, RTSPMessageHeader *reply, unsigned char **content_ptr)
Send a command to the RTSP server and wait for the reply.
int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply, unsigned char **content_ptr, int return_on_interleaved_data, const char *method)
Read a RTSP message from the server, or prepare to read data packets if we're reading data interleave...
int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method, const char *url, const char *headers)
Send a command to the RTSP server without waiting for the reply.
#define RTSP_TCP_MAX_PACKET_SIZE
Definition: rtsp.h:77
@ RTSP_LOWER_TRANSPORT_TCP
TCP; interleaved in RTSP.
Definition: rtsp.h:40
void ff_rtsp_close_connections(AVFormatContext *s)
Close all connection handles within the RTSP (de)muxer.
@ RTSP_STATE_STREAMING
initialized and sending/receiving data
Definition: rtsp.h:205
int ff_rtsp_send_cmd_with_content(AVFormatContext *s, const char *method, const char *url, const char *headers, RTSPMessageHeader *reply, unsigned char **content_ptr, const unsigned char *send_content, int send_content_length)
Send a command to the RTSP server and wait for the reply.
#define SDP_MAX_SIZE
Definition: rtsp.h:82
int ff_rtsp_connect(AVFormatContext *s)
Connect to the RTSP server and set up the individual media streams.
@ RTSP_STATUS_OK
Definition: rtspcodes.h:33
static int ff_rtsp_averror(enum RTSPStatusCode status_code, int default_averror)
Definition: rtspcodes.h:144
static int rtsp_write_close(AVFormatContext *s)
Definition: rtspenc.c:226
static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rtspenc.c:180
static const AVClass rtsp_muxer_class
Definition: rtspenc.c:38
AVOutputFormat ff_rtsp_muxer
Definition: rtspenc.c:243
int ff_rtsp_tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
Send buffered packets over TCP.
Definition: rtspenc.c:141
static int rtsp_write_record(AVFormatContext *s)
Definition: rtspenc.c:110
static int rtsp_write_header(AVFormatContext *s)
Definition: rtspenc.c:125
int ff_rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
Announce the stream to the server and set up the RTSPStream child objects for each media stream.
Definition: rtspenc.c:45
#define snprintf
Definition: snprintf.h:34
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
Format I/O context.
Definition: avformat.h:1232
AVIOContext * pb
I/O context.
Definition: avformat.h:1274
char * url
input or output URL.
Definition: avformat.h:1328
const char * name
Definition: avformat.h:491
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
This describes the server response to each RTSP command.
Definition: rtsp.h:130
enum RTSPStatusCode status_code
response code from server
Definition: rtsp.h:134
Private data for the RTSP demuxer.
Definition: rtsp.h:227
int nb_rtsp_streams
number of items in the 'rtsp_streams' variable
Definition: rtsp.h:232
URLContext * rtsp_hd_out
Additional output handle, used when input and output are done separately, eg for HTTP tunneling.
Definition: rtsp.h:337
enum RTSPLowerTransport lower_transport
the negotiated network layer transport protocol; e.g.
Definition: rtsp.h:271
char control_uri[MAX_URL_SIZE]
some MS RTSP streams contain a URL in the SDP that we need to use for all subsequent RTSP requests,...
Definition: rtsp.h:326
URLContext * rtsp_hd
Definition: rtsp.h:229
enum RTSPClientState state
indicator of whether we are currently receiving data from the server.
Definition: rtsp.h:240
struct RTSPStream ** rtsp_streams
streams in this session
Definition: rtsp.h:234
Describe a single stream, as identified by a single m= line block in the SDP content.
Definition: rtsp.h:444
int interleaved_min
interleave IDs; copies of RTSPTransportField->interleaved_min/max for the selected transport.
Definition: rtsp.h:453
char control_url[MAX_URL_SIZE]
url for this stream (from SDP)
Definition: rtsp.h:455
int interleaved_max
Definition: rtsp.h:453
int stream_index
corresponding stream index, if any.
Definition: rtsp.h:449
void * transport_priv
RTP/RDT parse context if input, RTP AVFormatContext if output.
Definition: rtsp.h:446
#define av_free(p)
#define av_log(a,...)
AVPacket * pkt
Definition: movenc.c:59
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
int size
int ff_url_join(char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)
Definition: url.c:38
unbuffered private I/O API
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98