nginx-mod-rtmp/ngx_rtmp_broadcast_module.c

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/*
* Copyright (c) 2012 Roman Arutyunyan
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp.h"
static ngx_int_t ngx_rtmp_broadcast_postconfiguration(ngx_conf_t *cf);
static void * ngx_rtmp_broadcast_create_srv_conf(ngx_conf_t *cf);
static char * ngx_rtmp_broadcast_merge_srv_conf(ngx_conf_t *cf,
void *parent, void *child);
typedef struct {
/* use hash-map
* stream -> broadcast contexts */
ngx_int_t buckets;
struct ngx_rtmp_broadcast_ctx_s **contexts;
} ngx_rtmp_broadcast_srv_conf_t;
static ngx_command_t ngx_rtmp_broadcast_commands[] = {
{ ngx_string("broadcast_buckets"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_broadcast_srv_conf_t, buckets),
NULL },
ngx_null_command
};
static ngx_rtmp_module_t ngx_rtmp_broadcast_module_ctx = {
NULL, /* preconfiguration */
ngx_rtmp_broadcast_postconfiguration, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
ngx_rtmp_broadcast_create_srv_conf, /* create server configuration */
ngx_rtmp_broadcast_merge_srv_conf /* merge server configuration */
};
ngx_module_t ngx_rtmp_broadcast_module = {
NGX_MODULE_V1,
&ngx_rtmp_broadcast_module_ctx, /* module context */
ngx_rtmp_broadcast_commands, /* module directives */
NGX_RTMP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
#define NGX_RTMP_PUBLISHER 0x01
#define NGX_RTMP_SUBSCRIBER 0x02
#define NGX_RTMP_SESSION_HASH_SIZE 16384
typedef struct ngx_rtmp_broadcast_ctx_s {
ngx_str_t stream;
ngx_rtmp_session_t *session;
struct ngx_rtmp_broadcast_ctx_s *next;
ngx_uint_t flags; /* publisher/subscriber */
uint32_t csid;
} ngx_rtmp_broadcast_ctx_t;
static void *
ngx_rtmp_broadcast_create_srv_conf(ngx_conf_t *cf)
{
ngx_rtmp_broadcast_srv_conf_t *cscf;
cscf = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_broadcast_srv_conf_t));
if (cscf == NULL) {
return NULL;
}
cscf->buckets = NGX_CONF_UNSET;
return cscf;
}
static char *
ngx_rtmp_broadcast_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_rtmp_broadcast_srv_conf_t *prev = parent;
ngx_rtmp_broadcast_srv_conf_t *conf = child;
ngx_conf_merge_value(conf->buckets, prev->buckets, 1024);
conf->contexts = ngx_pcalloc(cf->pool,
sizeof(ngx_rtmp_broadcast_ctx_t *) * conf->buckets);
return NGX_CONF_OK;
}
static ngx_rtmp_broadcast_ctx_t **
ngx_rtmp_broadcast_get_head(ngx_rtmp_broadcast_ctx_t *ctx)
{
ngx_rtmp_broadcast_srv_conf_t *bscf;
bscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_broadcast_module);
return &bscf->contexts[
ngx_hash_key(ctx->stream.data, ctx->stream.len)
% bscf->buckets];
}
static void
ngx_rtmp_broadcast_join(ngx_rtmp_session_t *s, ngx_str_t *stream,
ngx_uint_t flags)
{
ngx_connection_t *c;
ngx_rtmp_broadcast_ctx_t *ctx, **hctx;
c = s->connection;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_broadcast_module);
if (ctx == NULL) {
ctx = ngx_pcalloc(c->pool, sizeof(ngx_rtmp_broadcast_ctx_t));
ctx->session = s;
ngx_rtmp_set_ctx(s, ctx, ngx_rtmp_broadcast_module);
}
if (ctx->stream.len) {
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, c->log, 0, "already joined");
return;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, c->log, 0,
"join broadcast stream '%V'", &stream);
s->stream = *stream;
hctx = ngx_rtmp_broadcast_get_head(ctx);
ctx->next = *hctx;
ctx->flags = flags;
*hctx = ctx;
}
static void
ngx_rtmp_broadcast_leave(ngx_rtmp_session_t *s)
{
ngx_connection_t *c;
ngx_rtmp_broadcast_ctx_t *ctx, **hctx;
c = s->connection;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_broadcast_module);
if (ctx == NULL || !ctx->stream.len) {
return;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, c->log, 0,
"leave broadcast stream '%V'", &s->stream);
hctx = ngx_rtmp_broadcast_get_head(ctx);
ngx_str_null(&ctx->stream);
for(; *hctx; hctx = &(*hctx)->next) {
if (*hctx == ctx) {
*hctx = (*hctx)->next;
return;
}
}
}
static ngx_rtmp_broadcast_connect(ngx_rtmp_session_t *s, double in_trans,
ngx_chain_t *in)
{
static double trans;
static u_char app[1024];
static u_char url[1024];
static ngx_rtmp_amf0_elt_t in_cmd[] = {
{ NGX_RTMP_AMF0_STRING, "app", app, sizeof(app) },
{ NGX_RTMP_AMF0_STRING, "pageUrl", url, sizeof(utl) },
};
static ngx_rtmp_amf0_elt_t out_inf[] = {
{ NGX_RTMP_AMF0_STRING, "code", NULL, 0 },
{ NGX_RTMP_AMF0_STRING, "level", NULL, 0 },
{ NGX_RTMP_AMF0_STRING, "description", NULL, 0 },
};
static ngx_rtmp_amf0_elt_t in_elts[] = {
{ NGX_RTMP_AMF0_OBJECT, NULL, in_cmd, sizeof(in_cmd) },
{ NGX_RTMP_AMF0_NULL, NULL, NULL, 0 },
};
static ngx_rtmp_amf0_elt_t out_elts[] = {
{ NGX_RTMP_AMF0_STRING, NULL, "_result", sizeof("_result") - 1 },
{ NGX_RTMP_AMF0_NUMBER, NULL, &trans, sizeof(trans) },
{ NGX_RTMP_AMF0_NULL , NULL, NULL, 0 },
{ NGX_RTMP_AMF0_OBJECT, NULL, out_inf, sizeof(out_inf) },
};
if (ngx_rtmp_receive_amf0(s, in, in_elts,
sizeof(in_elts) / sizeof(in_elts[0])))
{
return NGX_ERROR;
}
trans = in_trans;
ngx_str_set(&inf[0], "NetConnection.Connect.Success");
ngx_str_set(&inf[1], "status");
ngx_str_set(&inf[2], "Connection succeeded.");
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, c->log, 0,
"connect() called; app='%s' url='%s'",
app, url);
/*ngx_rtmp_broadcast_join(s, app);*/
return ngx_rtmp_send_ack_size(s, 65536)
|| ngx_rtmp_send_bandwidth(s, 65536, NGX_RTMP_LIMIT_SOFT)
|| ngx_rtmp_send_user_stream_begin(s, 1)
|| ngx_rtmp_send_amf0(s, 3, 1, out_elts,
sizeof(out_elts) / sizeof(out_elts[0]))
? NGX_ERROR
: NGX_OK;
}
static ngx_int_t
ngx_rtmp_broadcast_postconfiguration(ngx_conf_t *cf)
{
ngx_rtmp_core_main_conf_t *cmcf;
ngx_hash_key_t *h;
ngx_rtmp_disconnect_handler_pt *dh;
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_rtmp_module);
/* add connect() handler */
h = ngx_array_push(&cmcf->calls);
if (h == NULL) {
return NGX_ERROR;
}
ngx_str_set(&h->key, "connect");
h->value = ngx_rtmp_broadcast_connect;
/* add disconnect handler */
dh = ngx_array_push(&cmcf->disconnect);
if (dh == NULL) {
return NGX_ERROR;
}
*dh = ngx_rtmp_broadcast_leave;
return NGX_OK;
}