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