| /* |
| * 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 || 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 || 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_BOOL, {.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, |
| }; |
