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ngx_rtmp_receive.c
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ngx_rtmp_receive.c
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/*
* Copyright (C) Roman Arutyunyan
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp.h"
#include "ngx_rtmp_amf.h"
#include "ngx_rtmp_cmd_module.h"
#include <string.h>
ngx_int_t
ngx_rtmp_protocol_message_handler(ngx_rtmp_session_t *s,
ngx_rtmp_header_t *h, ngx_chain_t *in)
{
ngx_buf_t *b;
u_char *p;
uint32_t val;
uint8_t limit;
b = in->buf;
if (b->last - b->pos < 4) {
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->log, 0,
"too small buffer for %d message: %d",
(int)h->type, b->last - b->pos);
return NGX_OK;
}
p = (u_char*)&val;
p[0] = b->pos[3];
p[1] = b->pos[2];
p[2] = b->pos[1];
p[3] = b->pos[0];
switch(h->type) {
case NGX_RTMP_MSG_CHUNK_SIZE:
/* set chunk size =val */
ngx_rtmp_set_chunk_size(s, val);
break;
case NGX_RTMP_MSG_ABORT:
/* abort chunk stream =val */
break;
case NGX_RTMP_MSG_ACK:
/* receive ack with sequence number =val */
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"receive ack seq=%uD", val);
break;
case NGX_RTMP_MSG_ACK_SIZE:
/* receive window size =val */
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"receive ack_size=%uD", val);
s->ack_size = val;
break;
case NGX_RTMP_MSG_BANDWIDTH:
if (b->last - b->pos >= 5) {
limit = *(uint8_t*)&b->pos[4];
(void)val;
(void)limit;
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->log, 0,
"receive bandwidth=%uD limit=%d",
val, (int)limit);
/* receive window size =val
* && limit */
}
break;
default:
return NGX_ERROR;
}
return NGX_OK;
}
ngx_int_t
ngx_rtmp_user_message_handler(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_chain_t *in)
{
ngx_buf_t *b;
u_char *p;
uint16_t evt;
uint32_t val;
b = in->buf;
if (b->last - b->pos < 6) {
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"too small buffer for user message: %d",
b->last - b->pos);
return NGX_OK;
}
p = (u_char*)&evt;
p[0] = b->pos[1];
p[1] = b->pos[0];
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->log, 0,
"RTMP recv user evt %s (%i)",
ngx_rtmp_user_message_type(evt), (ngx_int_t) evt);
p = (u_char *) &val;
p[0] = b->pos[5];
p[1] = b->pos[4];
p[2] = b->pos[3];
p[3] = b->pos[2];
switch(evt) {
case NGX_RTMP_USER_STREAM_BEGIN:
{
ngx_rtmp_stream_begin_t v;
v.msid = val;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"receive: stream_begin msid=%uD", v.msid);
return ngx_rtmp_stream_begin(s, &v);
}
case NGX_RTMP_USER_STREAM_EOF:
{
ngx_rtmp_stream_eof_t v;
v.msid = val;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"receive: stream_eof msid=%uD", v.msid);
return ngx_rtmp_stream_eof(s, &v);
}
case NGX_RTMP_USER_STREAM_DRY:
{
ngx_rtmp_stream_dry_t v;
v.msid = val;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"receive: stream_dry msid=%uD", v.msid);
return ngx_rtmp_stream_dry(s, &v);
}
case NGX_RTMP_USER_SET_BUFLEN:
{
ngx_rtmp_set_buflen_t v;
v.msid = val;
if (b->last - b->pos < 10) {
return NGX_OK;
}
p = (u_char *) &v.buflen;
p[0] = b->pos[9];
p[1] = b->pos[8];
p[2] = b->pos[7];
p[3] = b->pos[6];
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->log, 0,
"receive: set_buflen msid=%uD buflen=%uD",
v.msid, v.buflen);
/*TODO: move this to play module */
s->buflen = v.buflen;
return ngx_rtmp_set_buflen(s, &v);
}
case NGX_RTMP_USER_RECORDED:
{
ngx_rtmp_recorded_t v;
v.msid = val;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"receive: recorded msid=%uD", v.msid);
return ngx_rtmp_recorded(s, &v);
}
case NGX_RTMP_USER_PING_REQUEST:
return ngx_rtmp_send_ping_response(s, val);
case NGX_RTMP_USER_PING_RESPONSE:
/* val = incoming timestamp */
ngx_rtmp_reset_ping(s);
return NGX_OK;
default:
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"unexpected user event: %i", (ngx_int_t) evt);
return NGX_OK;
}
}
static ngx_int_t
ngx_rtmp_fetch(ngx_chain_t **in, u_char *ret)
{
while (*in && (*in)->buf->pos >= (*in)->buf->last) {
*in = (*in)->next;
}
if (*in == NULL) {
return NGX_DONE;
}
*ret = *(*in)->buf->pos++;
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_fetch_uint8(ngx_chain_t **in, uint8_t *ret)
{
return ngx_rtmp_fetch(in, (u_char *) ret);
}
static ngx_int_t
ngx_rtmp_fetch_uint32(ngx_chain_t **in, uint32_t *ret, ngx_int_t n)
{
u_char *r = (u_char *) ret;
ngx_int_t rc;
*ret = 0;
while (--n >= 0) {
rc = ngx_rtmp_fetch(in, &r[n]);
if (rc != NGX_OK) {
return rc;
}
}
return NGX_OK;
}
ngx_int_t
ngx_rtmp_aggregate_message_handler(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_chain_t *in)
{
uint32_t base_time, timestamp, prev_size;
size_t len;
ngx_int_t first;
u_char *last;
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t *cl, *next;
ngx_rtmp_header_t ch;
ch = *h;
first = 1;
base_time = 0;
while (in) {
if (ngx_rtmp_fetch_uint8(&in, &ch.type) != NGX_OK) {
return NGX_OK;
}
if (ngx_rtmp_fetch_uint32(&in, &ch.mlen, 3) != NGX_OK) {
return NGX_ERROR;
}
if (ngx_rtmp_fetch_uint32(&in, ×tamp, 3) != NGX_OK) {
return NGX_ERROR;
}
if (ngx_rtmp_fetch_uint8(&in, (uint8_t *) ×tamp + 3) != NGX_OK)
{
return NGX_ERROR;
}
if (ngx_rtmp_fetch_uint32(&in, &ch.msid, 3) != NGX_OK)
{
return NGX_ERROR;
}
if (first) {
base_time = timestamp;
first = 0;
}
ngx_log_debug6(NGX_LOG_DEBUG_RTMP, s->log, 0,
"RTMP aggregate %s (%d) len=%uD time=%uD (+%D) msid=%uD",
ngx_rtmp_message_type(ch.type),
(ngx_int_t) ch.type, ch.mlen, ch.timestamp,
timestamp - base_time, ch.msid);
/* limit chain */
len = 0;
cl = in;
while (cl) {
b = cl->buf;
len += (b->last - b->pos);
if (len > ch.mlen) {
break;
}
cl = cl->next;
}
if (cl == NULL) {
ngx_log_error(NGX_LOG_INFO, s->log, 0,
"RTMP error parsing aggregate");
return NGX_ERROR;
}
next = cl->next;
cl->next = NULL;
b = cl->buf;
last = b->last;
b->last -= (len - ch.mlen);
/* handle aggregated message */
ch.timestamp = h->timestamp + timestamp - base_time;
rc = ngx_rtmp_receive_message(s, &ch, in);
/* restore chain before checking the result */
in = cl;
in->next = next;
b->pos = b->last;
b->last = last;
if (rc != NGX_OK) {
return rc;
}
/* read 32-bit previous tag size */
if (ngx_rtmp_fetch_uint32(&in, &prev_size, 4) != NGX_OK) {
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"RTMP aggregate prev_size=%uD", prev_size);
}
return NGX_OK;
}
ngx_int_t
ngx_rtmp_amf_message_handler(ngx_rtmp_session_t *s,
ngx_rtmp_header_t *h, ngx_chain_t *in)
{
ngx_rtmp_amf_ctx_t act;
ngx_rtmp_core_main_conf_t *cmcf;
ngx_array_t *ch;
ngx_rtmp_handler_pt *ph;
size_t len, n;
static u_char func[128];
static ngx_rtmp_amf_elt_t elts[] = {
{ NGX_RTMP_AMF_STRING,
ngx_null_string,
func, sizeof(func) },
};
/* AMF command names come with string type, but shared object names
* come without type */
if (h->type == NGX_RTMP_MSG_AMF_SHARED ||
h->type == NGX_RTMP_MSG_AMF3_SHARED)
{
elts[0].type |= NGX_RTMP_AMF_TYPELESS;
} else {
elts[0].type &= ~NGX_RTMP_AMF_TYPELESS;
}
if ((h->type == NGX_RTMP_MSG_AMF3_SHARED ||
h->type == NGX_RTMP_MSG_AMF3_META ||
h->type == NGX_RTMP_MSG_AMF3_CMD)
&& in->buf->last > in->buf->pos)
{
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"AMF3 prefix: %ui", (ngx_int_t)*in->buf->pos);
++in->buf->pos;
}
cmcf = ngx_rtmp_get_module_main_conf(s, ngx_rtmp_core_module);
/* read AMF func name & transaction id */
ngx_memzero(&act, sizeof(act));
act.link = in;
act.log = s->log;
memset(func, 0, sizeof(func));
if (ngx_rtmp_amf_read(&act, elts,
sizeof(elts) / sizeof(elts[0])) != NGX_OK)
{
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->log, 0,
"AMF cmd failed");
return NGX_ERROR;
}
/* skip name */
in = act.link;
in->buf->pos += act.offset;
len = ngx_strlen(func);
ch = ngx_hash_find(&cmcf->amf_hash,
ngx_hash_strlow(func, func, len), func, len);
if (ch && ch->nelts) {
ph = ch->elts;
for (n = 0; n < ch->nelts; ++n, ++ph) {
ngx_log_debug3(NGX_LOG_DEBUG_RTMP, s->log, 0,
"AMF func '%s' passed to handler %d/%d",
func, n, ch->nelts);
switch ((*ph)(s, h, in)) {
case NGX_ERROR:
return NGX_ERROR;
case NGX_DONE:
return NGX_OK;
}
}
} else {
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
"AMF cmd '%s' no handler", func);
}
return NGX_OK;
}
ngx_int_t
ngx_rtmp_receive_amf(ngx_rtmp_session_t *s, ngx_chain_t *in,
ngx_rtmp_amf_elt_t *elts, size_t nelts)
{
ngx_rtmp_amf_ctx_t act;
ngx_memzero(&act, sizeof(act));
act.link = in;
act.log = s->log;
return ngx_rtmp_amf_read(&act, elts, nelts);
}