FFmpeg
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  */
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 };
ff_rtsp_read_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...
ff_rtsp_close_streams
void ff_rtsp_close_streams(AVFormatContext *s)
Close and free all streams within the RTSP (de)muxer.
Definition: rtsp.c:781
rtsp_muxer_class
static const AVClass rtsp_muxer_class
Definition: rtspenc.c:38
AVOutputFormat::name
const char * name
Definition: avformat.h:496
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
RTSPStream::transport_priv
void * transport_priv
RTP/RDT parse context if input, RTP AVFormatContext if output.
Definition: rtsp.h:446
ff_rtsp_send_cmd_with_content
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.
RTSPMessageHeader::status_code
enum RTSPStatusCode status_code
response code from server
Definition: rtsp.h:134
ff_rtsp_send_cmd
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.
ff_rtsp_averror
static int ff_rtsp_averror(enum RTSPStatusCode status_code, int default_averror)
Definition: rtspcodes.h:144
AV_CODEC_ID_MPEG4
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:62
RTSPStream::interleaved_min
int interleaved_min
interleave IDs; copies of RTSPTransportField->interleaved_min/max for the selected transport.
Definition: rtsp.h:453
RTSPStream
Describe a single stream, as identified by a single m= line block in the SDP content.
Definition: rtsp.h:444
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
ff_rtsp_send_cmd_async
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.
ff_network_close
void ff_network_close(void)
Definition: network.c:116
av_strlcatf
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
os_support.h
RTSPState::nb_rtsp_streams
int nb_rtsp_streams
number of items in the 'rtsp_streams' variable
Definition: rtsp.h:232
dynarray_add
#define dynarray_add(tab, nb_ptr, elem)
Definition: internal.h:442
RTSP_STATE_STREAMING
@ RTSP_STATE_STREAMING
initialized and sending/receiving data
Definition: rtsp.h:205
rtsp.h
RTSPStream::stream_index
int stream_index
corresponding stream index, if any.
Definition: rtsp.h:449
avio_close_dyn_buf
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1470
RTSPState::rtsp_hd_out
URLContext * rtsp_hd_out
Additional output handle, used when input and output are done separately, eg for HTTP tunneling.
Definition: rtsp.h:337
pkt
AVPacket * pkt
Definition: movenc.c:59
ff_write_chained
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:1307
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
ff_rtsp_muxer
const AVOutputFormat ff_rtsp_muxer
Definition: rtspenc.c:243
RTSPState::control_uri
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
RTSP_TCP_MAX_PACKET_SIZE
#define RTSP_TCP_MAX_PACKET_SIZE
Definition: rtsp.h:77
ff_url_join
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
ff_rtsp_undo_setup
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:749
AVFormatContext
Format I/O context.
Definition: avformat.h:1109
internal.h
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
RTSP_STATUS_OK
@ RTSP_STATUS_OK
Definition: rtspcodes.h:33
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
RTSPState::rtsp_hd
URLContext * rtsp_hd
Definition: rtsp.h:229
ff_rtsp_tcp_write_packet
int ff_rtsp_tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
Send buffered packets over TCP.
Definition: rtspenc.c:141
AV_WB16
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1151
SDP_MAX_SIZE
#define SDP_MAX_SIZE
Definition: rtsp.h:82
time.h
RTSPState::state
enum RTSPClientState state
indicator of whether we are currently receiving data from the server.
Definition: rtsp.h:240
rtsp_write_record
static int rtsp_write_record(AVFormatContext *s)
Definition: rtspenc.c:110
rtsp_write_header
static int rtsp_write_header(AVFormatContext *s)
Definition: rtspenc.c:125
rtsp_write_close
static int rtsp_write_close(AVFormatContext *s)
Definition: rtspenc.c:226
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:425
RTP_PT_IS_RTCP
#define RTP_PT_IS_RTCP(x)
Definition: rtp.h:112
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:325
ff_rtsp_options
const AVOption ff_rtsp_options[]
Definition: rtsp.c:80
ff_rtsp_close_connections
void ff_rtsp_close_connections(AVFormatContext *s)
Close all connection handles within the RTSP (de)muxer.
RTSPState
Private data for the RTSP demuxer.
Definition: rtsp.h:227
RTSPState::lower_transport
enum RTSPLowerTransport lower_transport
the negotiated network layer transport protocol; e.g.
Definition: rtsp.h:271
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1192
size
int size
Definition: twinvq_data.h:10344
RTSPState::rtsp_streams
struct RTSPStream ** rtsp_streams
streams in this session
Definition: rtsp.h:234
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
AVFMT_NOFILE
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:463
ff_rtsp_skip_packet
void ff_rtsp_skip_packet(AVFormatContext *s)
Skip a RTP/TCP interleaved packet.
ffio_open_dyn_packet_buf
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:1430
av_sdp_create
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
Generate an SDP for an RTP session.
Definition: sdp.c:828
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:731
AVFMT_GLOBALHEADER
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:466
AVOutputFormat
Definition: avformat.h:495
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
avio_internal.h
url.h
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:263
RTSP_LOWER_TRANSPORT_TCP
@ RTSP_LOWER_TRANSPORT_TCP
TCP; interleaved in RTSP.
Definition: rtsp.h:40
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
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:71
avformat.h
network.h
MAX_URL_SIZE
#define MAX_URL_SIZE
Definition: internal.h:32
RTSPStream::control_url
char control_url[MAX_URL_SIZE]
url for this stream (from SDP)
Definition: rtsp.h:455
RTSPStream::interleaved_max
int interleaved_max
Definition: rtsp.h:453
ffurl_write
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:415
RTSPMessageHeader
This describes the server response to each RTSP command.
Definition: rtsp.h:130
AVPacket::stream_index
int stream_index
Definition: packet.h:375
ff_rtsp_setup_output_streams
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
av_gettime
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
rtsp_write_packet
static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rtspenc.c:180
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVPacket
This structure stores compressed data.
Definition: packet.h:350
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_strlcpy
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
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
avstring.h
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:347
ff_rtsp_connect
int ff_rtsp_connect(AVFormatContext *s)
Connect to the RTSP server and set up the individual media streams.
snprintf
#define snprintf
Definition: snprintf.h:34
ffurl_get_file_handle
int ffurl_get_file_handle(URLContext *h)
Return the file descriptor associated with this URL.
Definition: avio.c:620