libavformat/rtmphttp.c - nest-android-app/ffmpeg - Git at Google

 /*
  * 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,
 };
	/*
	* 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,
	};