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ffmpeg/libavformat/rtmphttp.c
Martin Storsjö d872fb0f7f lavf: Reset the entry count and allocation size variables on av_reallocp failures 
When av_reallocp fails, the associated variables that keep track of
the number of elements in the array (and in some cases, the
separate number of allocated elements) need to be reset.

Not all of these might technically be needed, but it's better to
reset them if in doubt, to make sure variables don't end up
conflicting.

Signed-off-by: Martin Storsjö <martin@martin.st>
2013-09-26 23:14:03 +03:00

278 lines
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/*
* RTMP HTTP network protocol
* Copyright (c) 2012 Samuel Pitoiset
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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");
}
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 },
};
static const AVClass ffrtmphttp_class = {
.class_name = "ffrtmphttp",
.item_name = av_default_item_name,
.option = ffrtmphttp_options,
.version = LIBAVUTIL_VERSION_INT,
};
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,
};
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