From 8e50c57dcb481479f2fd46f9bdb6a9776b0d9fa6 Mon Sep 17 00:00:00 2001 From: Samuel Pitoiset Date: Sun, 17 Jun 2012 20:24:43 +0200 Subject: RTMPT protocol support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This adds two protocols, but one of them is an internal implementation detail just used as an abstraction layer/generalization in the code. The RTMPT protocol implementation uses rtmphttp:// as an alternative to the tcp:// protocol. This allows moving most of the lower level logic out from the higher level generic rtmp code. Signed-off-by: Martin Storsjö --- libavformat/rtmphttp.c | 239 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 239 insertions(+) create mode 100644 libavformat/rtmphttp.c (limited to 'libavformat/rtmphttp.c') diff --git a/libavformat/rtmphttp.c b/libavformat/rtmphttp.c new file mode 100644 index 0000000000..fdcff50bed --- /dev/null +++ b/libavformat/rtmphttp.c @@ -0,0 +1,239 @@ +/* + * 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 "internal.h" +#include "http.h" + +#define RTMPT_DEFAULT_PORT 80 + +/* protocol handler context */ +typedef struct RTMP_HTTPContext { + 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 +} 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; + + return ret; +} + +static int rtmp_http_write(URLContext *h, const uint8_t *buf, int size) +{ + RTMP_HTTPContext *rt = h->priv_data; + void *ptr; + + if (rt->out_size + size > rt->out_capacity) { + rt->out_capacity = (rt->out_size + size) * 2; + ptr = av_realloc(rt->out_data, rt->out_capacity); + if (!ptr) + return AVERROR(ENOMEM); + rt->out_data = ptr; + } + + 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 ((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; + } + } 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); + + if (rt->port < 0) + rt->port = RTMPT_DEFAULT_PORT; + + /* 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. */ + 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 && 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; +} + +URLProtocol ff_rtmphttp_protocol = { + .name = "rtmphttp", + .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, +}; -- cgit v1.2.3