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/* |
* RTMP HTTP network protocol |
* Copyright (c) 2012 Samuel Pitoiset |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* RTMP HTTP protocol |
*/ |
|
#include "libavutil/avstring.h" |
#include "libavutil/intfloat.h" |
#include "libavutil/opt.h" |
#include "libavutil/time.h" |
#include "internal.h" |
#include "http.h" |
#include "rtmp.h" |
|
#define RTMPT_DEFAULT_PORT 80 |
#define RTMPTS_DEFAULT_PORT RTMPS_DEFAULT_PORT |
|
/* protocol handler context */ |
typedef struct RTMP_HTTPContext { |
const AVClass *class; |
URLContext *stream; ///< HTTP stream |
char host[256]; ///< hostname of the server |
int port; ///< port to connect (default is 80) |
char client_id[64]; ///< client ID used for all requests except the first one |
int seq; ///< sequence ID used for all requests |
uint8_t *out_data; ///< output buffer |
int out_size; ///< current output buffer size |
int out_capacity; ///< current output buffer capacity |
int initialized; ///< flag indicating when the http context is initialized |
int finishing; ///< flag indicating when the client closes the connection |
int nb_bytes_read; ///< number of bytes read since the last request |
int tls; ///< use Transport Security Layer (RTMPTS) |
} RTMP_HTTPContext; |
|
static int rtmp_http_send_cmd(URLContext *h, const char *cmd) |
{ |
RTMP_HTTPContext *rt = h->priv_data; |
char uri[2048]; |
uint8_t c; |
int ret; |
|
ff_url_join(uri, sizeof(uri), "http", NULL, rt->host, rt->port, |
"/%s/%s/%d", cmd, rt->client_id, rt->seq++); |
|
av_opt_set_bin(rt->stream->priv_data, "post_data", rt->out_data, |
rt->out_size, 0); |
|
/* send a new request to the server */ |
if ((ret = ff_http_do_new_request(rt->stream, uri)) < 0) |
return ret; |
|
/* re-init output buffer */ |
rt->out_size = 0; |
|
/* read the first byte which contains the polling interval */ |
if ((ret = ffurl_read(rt->stream, &c, 1)) < 0) |
return ret; |
|
/* re-init the number of bytes read */ |
rt->nb_bytes_read = 0; |
|
return ret; |
} |
|
static int rtmp_http_write(URLContext *h, const uint8_t *buf, int size) |
{ |
RTMP_HTTPContext *rt = h->priv_data; |
|
if (rt->out_size + size > rt->out_capacity) { |
int err; |
rt->out_capacity = (rt->out_size + size) * 2; |
if ((err = av_reallocp(&rt->out_data, rt->out_capacity)) < 0) { |
rt->out_size = 0; |
rt->out_capacity = 0; |
return err; |
} |
} |
|
memcpy(rt->out_data + rt->out_size, buf, size); |
rt->out_size += size; |
|
return size; |
} |
|
static int rtmp_http_read(URLContext *h, uint8_t *buf, int size) |
{ |
RTMP_HTTPContext *rt = h->priv_data; |
int ret, off = 0; |
|
/* try to read at least 1 byte of data */ |
do { |
ret = ffurl_read(rt->stream, buf + off, size); |
if (ret < 0 && ret != AVERROR_EOF) |
return ret; |
|
if (ret == AVERROR_EOF) { |
if (rt->finishing) { |
/* Do not send new requests when the client wants to |
* close the connection. */ |
return AVERROR(EAGAIN); |
} |
|
/* When the client has reached end of file for the last request, |
* we have to send a new request if we have buffered data. |
* Otherwise, we have to send an idle POST. */ |
if (rt->out_size > 0) { |
if ((ret = rtmp_http_send_cmd(h, "send")) < 0) |
return ret; |
} else { |
if (rt->nb_bytes_read == 0) { |
/* Wait 50ms before retrying to read a server reply in |
* order to reduce the number of idle requets. */ |
av_usleep(50000); |
} |
|
if ((ret = rtmp_http_write(h, "", 1)) < 0) |
return ret; |
|
if ((ret = rtmp_http_send_cmd(h, "idle")) < 0) |
return ret; |
} |
|
if (h->flags & AVIO_FLAG_NONBLOCK) { |
/* no incoming data to handle in nonblocking mode */ |
return AVERROR(EAGAIN); |
} |
} else { |
off += ret; |
size -= ret; |
rt->nb_bytes_read += ret; |
} |
} while (off <= 0); |
|
return off; |
} |
|
static int rtmp_http_close(URLContext *h) |
{ |
RTMP_HTTPContext *rt = h->priv_data; |
uint8_t tmp_buf[2048]; |
int ret = 0; |
|
if (rt->initialized) { |
/* client wants to close the connection */ |
rt->finishing = 1; |
|
do { |
ret = rtmp_http_read(h, tmp_buf, sizeof(tmp_buf)); |
} while (ret > 0); |
|
/* re-init output buffer before sending the close command */ |
rt->out_size = 0; |
|
if ((ret = rtmp_http_write(h, "", 1)) == 1) |
ret = rtmp_http_send_cmd(h, "close"); |
} |
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av_freep(&rt->out_data); |
ffurl_close(rt->stream); |
|
return ret; |
} |
|
static int rtmp_http_open(URLContext *h, const char *uri, int flags) |
{ |
RTMP_HTTPContext *rt = h->priv_data; |
char headers[1024], url[1024]; |
int ret, off = 0; |
|
av_url_split(NULL, 0, NULL, 0, rt->host, sizeof(rt->host), &rt->port, |
NULL, 0, uri); |
|
/* This is the first request that is sent to the server in order to |
* register a client on the server and start a new session. The server |
* replies with a unique id (usually a number) that is used by the client |
* for all future requests. |
* Note: the reply doesn't contain a value for the polling interval. |
* A successful connect resets the consecutive index that is used |
* in the URLs. */ |
if (rt->tls) { |
if (rt->port < 0) |
rt->port = RTMPTS_DEFAULT_PORT; |
ff_url_join(url, sizeof(url), "https", NULL, rt->host, rt->port, "/open/1"); |
} else { |
if (rt->port < 0) |
rt->port = RTMPT_DEFAULT_PORT; |
ff_url_join(url, sizeof(url), "http", NULL, rt->host, rt->port, "/open/1"); |
} |
|
/* alloc the http context */ |
if ((ret = ffurl_alloc(&rt->stream, url, AVIO_FLAG_READ_WRITE, NULL)) < 0) |
goto fail; |
|
/* set options */ |
snprintf(headers, sizeof(headers), |
"Cache-Control: no-cache\r\n" |
"Content-type: application/x-fcs\r\n" |
"User-Agent: Shockwave Flash\r\n"); |
av_opt_set(rt->stream->priv_data, "headers", headers, 0); |
av_opt_set(rt->stream->priv_data, "multiple_requests", "1", 0); |
av_opt_set_bin(rt->stream->priv_data, "post_data", "", 1, 0); |
|
/* open the http context */ |
if ((ret = ffurl_connect(rt->stream, NULL)) < 0) |
goto fail; |
|
/* read the server reply which contains a unique ID */ |
for (;;) { |
ret = ffurl_read(rt->stream, rt->client_id + off, sizeof(rt->client_id) - off); |
if (ret == AVERROR_EOF) |
break; |
if (ret < 0) |
goto fail; |
off += ret; |
if (off == sizeof(rt->client_id)) { |
ret = AVERROR(EIO); |
goto fail; |
} |
} |
while (off > 0 && av_isspace(rt->client_id[off - 1])) |
off--; |
rt->client_id[off] = '\0'; |
|
/* http context is now initialized */ |
rt->initialized = 1; |
return 0; |
|
fail: |
rtmp_http_close(h); |
return ret; |
} |
|
#define OFFSET(x) offsetof(RTMP_HTTPContext, x) |
#define DEC AV_OPT_FLAG_DECODING_PARAM |
|
static const AVOption ffrtmphttp_options[] = { |
{"ffrtmphttp_tls", "Use a HTTPS tunneling connection (RTMPTS).", OFFSET(tls), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC}, |
{ NULL }, |
}; |
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static const AVClass ffrtmphttp_class = { |
.class_name = "ffrtmphttp", |
.item_name = av_default_item_name, |
.option = ffrtmphttp_options, |
.version = LIBAVUTIL_VERSION_INT, |
}; |
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URLProtocol ff_ffrtmphttp_protocol = { |
.name = "ffrtmphttp", |
.url_open = rtmp_http_open, |
.url_read = rtmp_http_read, |
.url_write = rtmp_http_write, |
.url_close = rtmp_http_close, |
.priv_data_size = sizeof(RTMP_HTTPContext), |
.flags = URL_PROTOCOL_FLAG_NETWORK, |
.priv_data_class= &ffrtmphttp_class, |
}; |