Libav
rtspenc.c
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1 /*
2  * RTSP muxer
3  * Copyright (c) 2010 Martin Storsjo
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 #define SDP_MAX_SIZE 16384
38 
39 static const AVClass rtsp_muxer_class = {
40  .class_name = "RTSP muxer",
41  .item_name = av_default_item_name,
42  .option = ff_rtsp_options,
43  .version = LIBAVUTIL_VERSION_INT,
44 };
45 
47 {
48  RTSPState *rt = s->priv_data;
49  RTSPMessageHeader reply1, *reply = &reply1;
50  int i;
51  char *sdp;
52  AVFormatContext sdp_ctx, *ctx_array[1];
53 
55 
56  /* Announce the stream */
57  sdp = av_mallocz(SDP_MAX_SIZE);
58  if (!sdp)
59  return AVERROR(ENOMEM);
60  /* We create the SDP based on the RTSP AVFormatContext where we
61  * aren't allowed to change the filename field. (We create the SDP
62  * based on the RTSP context since the contexts for the RTP streams
63  * don't exist yet.) In order to specify a custom URL with the actual
64  * peer IP instead of the originally specified hostname, we create
65  * a temporary copy of the AVFormatContext, where the custom URL is set.
66  *
67  * FIXME: Create the SDP without copying the AVFormatContext.
68  * This either requires setting up the RTP stream AVFormatContexts
69  * already here (complicating things immensely) or getting a more
70  * flexible SDP creation interface.
71  */
72  sdp_ctx = *s;
73  ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
74  "rtsp", NULL, addr, -1, NULL);
75  ctx_array[0] = &sdp_ctx;
76  if (av_sdp_create(ctx_array, 1, sdp, SDP_MAX_SIZE)) {
77  av_free(sdp);
78  return AVERROR_INVALIDDATA;
79  }
80  av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
81  ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
82  "Content-Type: application/sdp\r\n",
83  reply, NULL, sdp, strlen(sdp));
84  av_free(sdp);
85  if (reply->status_code != RTSP_STATUS_OK)
86  return AVERROR_INVALIDDATA;
87 
88  /* Set up the RTSPStreams for each AVStream */
89  for (i = 0; i < s->nb_streams; i++) {
90  RTSPStream *rtsp_st;
91 
92  rtsp_st = av_mallocz(sizeof(RTSPStream));
93  if (!rtsp_st)
94  return AVERROR(ENOMEM);
95  dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
96 
97  rtsp_st->stream_index = i;
98 
99  av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
100  /* Note, this must match the relative uri set in the sdp content */
101  av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
102  "/streamid=%d", i);
103  }
104 
105  return 0;
106 }
107 
109 {
110  RTSPState *rt = s->priv_data;
111  RTSPMessageHeader reply1, *reply = &reply1;
112  char cmd[1024];
113 
114  snprintf(cmd, sizeof(cmd),
115  "Range: npt=0.000-\r\n");
116  ff_rtsp_send_cmd(s, "RECORD", rt->control_uri, cmd, reply, NULL);
117  if (reply->status_code != RTSP_STATUS_OK)
118  return -1;
120  return 0;
121 }
122 
124 {
125  int ret;
126 
127  ret = ff_rtsp_connect(s);
128  if (ret)
129  return ret;
130 
131  if (rtsp_write_record(s) < 0) {
134  return AVERROR_INVALIDDATA;
135  }
136  return 0;
137 }
138 
140 {
141  RTSPState *rt = s->priv_data;
142  AVFormatContext *rtpctx = rtsp_st->transport_priv;
143  uint8_t *buf, *ptr;
144  int size;
145  uint8_t *interleave_header, *interleaved_packet;
146 
147  size = avio_close_dyn_buf(rtpctx->pb, &buf);
148  rtpctx->pb = NULL;
149  ptr = buf;
150  while (size > 4) {
151  uint32_t packet_len = AV_RB32(ptr);
152  int id;
153  /* The interleaving header is exactly 4 bytes, which happens to be
154  * the same size as the packet length header from
155  * ffio_open_dyn_packet_buf. So by writing the interleaving header
156  * over these bytes, we get a consecutive interleaved packet
157  * that can be written in one call. */
158  interleaved_packet = interleave_header = ptr;
159  ptr += 4;
160  size -= 4;
161  if (packet_len > size || packet_len < 2)
162  break;
163  if (RTP_PT_IS_RTCP(ptr[1]))
164  id = rtsp_st->interleaved_max; /* RTCP */
165  else
166  id = rtsp_st->interleaved_min; /* RTP */
167  interleave_header[0] = '$';
168  interleave_header[1] = id;
169  AV_WB16(interleave_header + 2, packet_len);
170  ffurl_write(rt->rtsp_hd_out, interleaved_packet, 4 + packet_len);
171  ptr += packet_len;
172  size -= packet_len;
173  }
174  av_free(buf);
176 }
177 
179 {
180  RTSPState *rt = s->priv_data;
181  RTSPStream *rtsp_st;
182  int n;
183  struct pollfd p = {ffurl_get_file_handle(rt->rtsp_hd), POLLIN, 0};
184  AVFormatContext *rtpctx;
185  int ret;
186 
187  while (1) {
188  n = poll(&p, 1, 0);
189  if (n <= 0)
190  break;
191  if (p.revents & POLLIN) {
192  RTSPMessageHeader reply;
193 
194  /* Don't let ff_rtsp_read_reply handle interleaved packets,
195  * since it would block and wait for an RTSP reply on the socket
196  * (which may not be coming any time soon) if it handles
197  * interleaved packets internally. */
198  ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
199  if (ret < 0)
200  return AVERROR(EPIPE);
201  if (ret == 1)
203  /* XXX: parse message */
204  if (rt->state != RTSP_STATE_STREAMING)
205  return AVERROR(EPIPE);
206  }
207  }
208 
209  if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams)
210  return AVERROR_INVALIDDATA;
211  rtsp_st = rt->rtsp_streams[pkt->stream_index];
212  rtpctx = rtsp_st->transport_priv;
213 
214  ret = ff_write_chained(rtpctx, 0, pkt, s);
215  /* ff_write_chained does all the RTP packetization. If using TCP as
216  * transport, rtpctx->pb is only a dyn_packet_buf that queues up the
217  * packets, so we need to send them out on the TCP connection separately.
218  */
219  if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP)
220  ret = ff_rtsp_tcp_write_packet(s, rtsp_st);
221  return ret;
222 }
223 
225 {
226  RTSPState *rt = s->priv_data;
227 
228  // If we want to send RTCP_BYE packets, these are sent by av_write_trailer.
229  // Thus call this on all streams before doing the teardown. This is
230  // done within ff_rtsp_undo_setup.
231  ff_rtsp_undo_setup(s, 1);
232 
233  ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
234 
238  return 0;
239 }
240 
242  .name = "rtsp",
243  .long_name = NULL_IF_CONFIG_SMALL("RTSP output"),
244  .priv_data_size = sizeof(RTSPState),
245  .audio_codec = AV_CODEC_ID_AAC,
246  .video_codec = AV_CODEC_ID_MPEG4,
251  .priv_class = &rtsp_muxer_class,
252 };
void ff_rtsp_skip_packet(AVFormatContext *s)
Skip a RTP/TCP interleaved packet.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int64_t start_time_realtime
Start time of the stream in real world time, in microseconds since the Unix epoch (00:00 1st January ...
Definition: avformat.h:1138
int size
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:966
enum AVCodecID id
Definition: mxfenc.c:84
char control_uri[1024]
some MS RTSP streams contain a URL in the SDP that we need to use for all subsequent RTSP requests...
Definition: rtsp.h:316
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:276
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: assenc.c:58
void ff_network_close(void)
Definition: network.c:150
initialized and sending/receiving data
Definition: rtsp.h:196
This describes the server response to each RTSP command.
Definition: rtsp.h:126
Format I/O context.
Definition: avformat.h:922
int ff_rtsp_connect(AVFormatContext *s)
Connect to the RTSP server and set up the individual media streams.
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:38
uint8_t
miscellaneous OS support macros and functions.
#define AV_RB32
Definition: intreadwrite.h:130
URLContext * rtsp_hd_out
Additional output handle, used when input and output are done separately, eg for HTTP tunneling...
Definition: rtsp.h:327
Describe a single stream, as identified by a single m= line block in the SDP content.
Definition: rtsp.h:420
static int flags
Definition: log.c:44
enum RTSPStatusCode status_code
response code from server
Definition: rtsp.h:130
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:139
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
Generate an SDP for an RTP session.
Definition: sdp.c:689
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.
static int write_trailer(AVFormatContext *s)
Definition: assenc.c:64
Private data for the RTSP demuxer.
Definition: rtsp.h:217
AVOutputFormat ff_rtsp_muxer
Definition: rtspenc.c:241
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
const AVOption ff_rtsp_options[]
Definition: rtsp.c:78
int ff_rtsp_tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
Send buffered packets over TCP.
Definition: rtspenc.c:139
URLContext * rtsp_hd
Definition: rtsp.h:219
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
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:81
struct RTSPStream ** rtsp_streams
streams in this session
Definition: rtsp.h:224
int stream_index
corresponding stream index, if any.
Definition: rtsp.h:425
static int rtsp_write_close(AVFormatContext *s)
Definition: rtspenc.c:224
static int rtsp_write_header(AVFormatContext *s)
Definition: rtspenc.c:123
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:978
#define dynarray_add(tab, nb_ptr, elem)
Definition: internal.h:64
char filename[1024]
input or output filename
Definition: avformat.h:998
int nb_rtsp_streams
number of items in the &#39;rtsp_streams&#39; variable
Definition: rtsp.h:222
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 &#39;max_packet_size&#39;.
Definition: aviobuf.c:959
#define RTSP_TCP_MAX_PACKET_SIZE
Definition: rtsp.h:74
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:415
const char * name
Definition: avformat.h:446
static int rtsp_write_record(AVFormatContext *s)
Definition: rtspenc.c:108
int ffurl_get_file_handle(URLContext *h)
Return the file descriptor associated with this URL.
Definition: avio.c:352
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
#define SDP_MAX_SIZE
Definition: rtspenc.c:37
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:37
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:36
enum RTSPLowerTransport lower_transport
the negotiated network layer transport protocol; e.g.
Definition: rtsp.h:261
NULL
Definition: eval.c:55
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:663
AVIOContext * pb
I/O context.
Definition: avformat.h:964
av_default_item_name
Definition: dnxhdenc.c:52
Describe the class of an AVClass context structure.
Definition: log.h:33
#define AV_WB16(p, d)
Definition: intreadwrite.h:213
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:99
void ff_rtsp_close_streams(AVFormatContext *s)
Close and free all streams within the RTSP (de)muxer.
Definition: rtsp.c:699
#define RTP_PT_IS_RTCP(x)
Definition: rtp.h:110
enum RTSPClientState state
indicator of whether we are currently receiving data from the server.
Definition: rtsp.h:230
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.
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:409
int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt, AVFormatContext *src)
Write a packet to another muxer than the one the user originally intended.
Definition: mux.c:628
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&#39;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.
TCP; interleaved in RTSP.
Definition: rtsp.h:39
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:46
char control_url[1024]
url for this stream (from SDP)
Definition: rtsp.h:431
void * priv_data
Format private data.
Definition: avformat.h:950
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:380
static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rtspenc.c:178
unbuffered private I/O API
int stream_index
Definition: avcodec.h:975
int interleaved_max
Definition: rtsp.h:429
static const AVClass rtsp_muxer_class
Definition: rtspenc.c:39
int interleaved_min
interleave IDs; copies of RTSPTransportField->interleaved_min/max for the selected transport...
Definition: rtsp.h:429
This structure stores compressed data.
Definition: avcodec.h:950
void ff_rtsp_close_connections(AVFormatContext *s)
Close all connection handles within the RTSP (de)muxer.
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
void * transport_priv
RTP/RDT parse context if input, RTP AVFormatContext if output.
Definition: rtsp.h:422