Nginx-rtmp之 ngx_rtmp_send.c 文件分析
2024-10-07 00:01:37
1. 简述
1.1 RTMP 消息类型
/* RTMP message types */
#define NGX_RTMP_MSG_CHUNK_SIZE 1
#define NGX_RTMP_MSG_ABORT 2
#define NGX_RTMP_MSG_ACK 3
#define NGX_RTMP_MSG_USER 4
#define NGX_RTMP_MSG_ACK_SIZE 5
#define NGX_RTMP_MSG_BANDWIDTH 6
#define NGX_RTMP_MSG_EDGE 7
#define NGX_RTMP_MSG_AUDIO 8
#define NGX_RTMP_MSG_VIDEO 9
#define NGX_RTMP_MSG_AMF3_META 15
#define NGX_RTMP_MSG_AMF3_SHARED 16
#define NGX_RTMP_MSG_AMF3_CMD 17
#define NGX_RTMP_MSG_AMF_META 18
#define NGX_RTMP_MSG_AMF_SHARED 19
#define NGX_RTMP_MSG_AMF_CMD 20
#define NGX_RTMP_MSG_AGGREGATE 22
#define NGX_RTMP_MSG_MAX 22
1.2 RMTP control message types
#define NGX_RTMP_USER_STREAM_BEGIN 0
#define NGX_RTMP_USER_STREAM_EOF 1
#define NGX_RTMP_USER_STREAM_DRY 2
#define NGX_RTMP_USER_SET_BUFLEN 3
#define NGX_RTMP_USER_RECORDED 4
#define NGX_RTMP_USER_PING_REQUEST 6
#define NGX_RTMP_USER_PING_RESPONSE 7
#define NGX_RTMP_USER_UNKNOWN 8
#define NGX_RTMP_USER_BUFFER_END 31
2. 源码分析
2.1 ngx_rtmp_send_ack_size：发送 ack_size 包
ngx_int_t ngx_rtmp_send_ack_size(ngx_rtmp_session_t *s, uint32_t ack_size)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_ack_size(s, ack_size));
}
send ack_size == 5000000
2.2 ngx_rtmp_create_ack_size
ngx_chain_t *ngx_rtmp_create_ack_size(ngx_rtmp_session_t *s, uint32_t ack_size)
{
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"create: ack_size=%uD", ack_size);
{
NGX_RTMP_USER_START(s, NGX_RTMP_MSG_ACK_SIZE);
NGX_RTMP_USER_OUT4(ack_size);
NGX_RTMP_USER_END(s);
}
}
2.2.1 NGX_RTMP_USER_START
#define NGX_RTMP_USER_START(s, tp) \
ngx_rtmp_header_t __h; \
ngx_chain_t *__l; \
ngx_buf_t *__b; \
ngx_rtmp_core_srv_conf_t *__cscf; \
\
__cscf = ngx_rtmp_get_module_srv_conf( \
s, ngx_rtmp_core_module); \
/* 初始化 RTMP 消息的头部 */
memset(&__h, 0, sizeof(__h)); \
__h.type = tp; \
/* csid 为 2 表明该chunk是控制信息和一些命令信息 */
__h.csid = 2; \
__l = ngx_rtmp_alloc_shared_buf(__cscf); \
if (__l == NULL) { \
return NULL; \
} \
__b = __l->buf;
该宏主要是初始化 RTMP 消息头，并为 ngx_chain_t 结构体指针分配内存，用来存储将要发送的数据。
ngx_rtmp_alloc_shared_buf: 分配一个 shared 的 ngx_chain_t 结构体内存
ngx_chain_t *ngx_rtmp_alloc_shared_buf(ngx_rtmp_core_srv_conf_t *cscf)
{
u_char *p;
ngx_chain_t *out;
ngx_buf_t *b;
size_t size;
/* 若 free 有空闲的 ngx_chain_t，则直接从 free 指向的链表头中取 */
if (cscf->free) {
out = cscf->free;
cscf->free = out->next;
} else {
/* 计算一个实际的 rtmp 块的最大值 */
size = cscf->chunk_size + NGX_RTMP_MAX_CHUNK_HEADER;
/* 从内存池中分配一块连续的内存 */
p = ngx_pcalloc(cscf->pool, NGX_RTMP_REFCOUNT_BYTES
+ sizeof(ngx_chain_t)
+ sizeof(ngx_buf_t)
+ size);
if (p == NULL) {
return NULL;
}
/* 这块内存的开始 4 bytes 是用于保存这块 shared 内存的引用计数值的 */
p += NGX_RTMP_REFCOUNT_BYTES;
out = (ngx_chain_t *)p;
p += sizeof(ngx_chain_t);
out->buf = (ngx_buf_t *)p;
p += sizeof(ngx_buf_t);
out->buf->start = p;
out->buf->end = p + size;
}
out->next = NULL;
b = out->buf;
/* 由于分配好内存后，下一步操作是直接向这块内存写入 rtmp 的 chunk data，
* 即跳过了 rtmp 的头部，暂时先写入实际数据，因此，这里需要为 rtmp 的头部
* 预留足够的内存，这里为NGX_RTMP_MAX_CHUNK_HEADER */
b->pos = b->last = b->start + NGX_RTMP_MAX_CHUNK_HEADER;
b->memory = 1;
/* 这里引用计数最初置为 1 */
/* buffer has refcount =1 when created! */
ngx_rtmp_ref_set(out, 1);
return out;
}
2.2.2 NGX_RTMP_USER_OUT4
#define NGX_RTMP_USER_OUT4(v) \
*(__b->last++) = ((u_char*)&v)[3]; \
*(__b->last++) = ((u_char*)&v)[2]; \
*(__b->last++) = ((u_char*)&v)[1]; \
*(__b->last++) = ((u_char*)&v)[0];
该宏主要是将 v 的值转换为大端字节序放置到通过 NGX_RTMP_USER_START 宏分配好缓存的内存中。
2.2.3 NGX_RTMP_USER_END
#define NGX_RTMP_USER_END(s) \
ngx_rtmp_prepare_message(s, &__h, NULL, __l); \
return __l;
2.2.4 ngx_rtmp_prepare_message
void ngx_rtmp_prepare_message(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_rtmp_header_t *lh, ngx_chain_t *out)
{
ngx_chain_t *l;
u_char *p, *pp;
ngx_int_t hsize, thsize, nbufs;
uint32_t mlen, timestamp, ext_timestamp;
static uint8_t hdrsize[] = { 12, 8, 4, 1 };
u_char th[7];
ngx_rtmp_core_srv_conf_t *cscf;
uint8_t fmt;
ngx_connection_t *c;
c = s->connection;
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
/* 检测 csid 是否太大 */
if (h->csid >= (uint32_t)cscf->max_streams) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"RTMP out chunk stream too big: %D >= %D",
h->csid, cscf->max_streams);
ngx_rtmp_finalize_session(s);
return;
}
/* 检测输出缓存的总大小 */
/* detect packet size */
mlen = 0;
nbufs = 0;
for(l = out; l; l = l->next) {
mlen += (l->buf->last - l->buf->pos);
++nbufs;
}
/* 若当前发送的是 RTMP 消息的第一个 chunk 时，fmt 必须为 0 */
fmt = 0;
/* 下面的判断是检测是否分块，若分块了，则头部中相应的字段就有变化了 */
/* 若这两个 chunk：lh 和 h 是在同一个消息的流中，即 msid 相同 */
if (lh && lh->csid && h->msid == lh->msid)
{
/* fmt 加 1，此时 Message Header 需 7 bytes */
++fmt;
/* 若不仅在同一个流中，且 chunk 的长度和消息类型都相同 */
if (h->type == lh->type && mlen && mlen == lh->mlen) {
/* fmt 再加 1，此时表示 Message Header 仅需 3 bytes，即 timestamp delta */
++fmt;
if (h->timestamp == lh->timestamp) {
/* fmt 再加 1，此时表示这个 chunk 和上一个完全相同的，
* 即 不需要 Message Header 了，为 0 byte */
++fmt;
}
}
/* 这是计算当前 chunk 和上一个 chunk 的时间戳差值，即 timestamp delta */
timestamp = h->timestamp - lh->timestamp;
}
else
{
/* 这里表示这是第一个 chunk 或者是不需要分块的 */
timestamp = h->timestamp;
}
/*if (lh) {
*lh = *h;
lh->mlen = mlen;
}*/
/* 根据 fmt 得出 rtmp 消息头的实际大小，这里默认 rtmp 的 Basic Header 大小为 1 byte */
hsize = hdrsize[fmt];
ngx_log_debug8(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"RTMP prep %s (%d) fmt=%d csid=%uD timestamp=%uD "
"mlen=%uD msid=%uD nbufs=%d",
ngx_rtmp_message_type(h->type), (int)h->type, (int)fmt,
h->csid, timestamp, mlen, h->msid, nbufs);
/* 这里只有当 timestamp 大于 3 字节能表示的最大数值时，才会有 扩展时间戳 */
ext_timestamp = 0;
if (timestamp >= 0x00ffffff) {
/* 若需要用到扩展时间戳，则 ext_timestamp 表示真正的时间戳，而 timestamp 字段全置为 1 */
ext_timestamp = timestamp;
timestamp = 0x00ffffff;
/* 扩展时间戳占 4 bytes */
hsize += 4;
}
/* 若 csid 大于 64，则表示 Basic Header 需要 2 个字节，此时 csid 范围 [64, 319] */
if (h->csid >= 64) {
++hsize;
/* 若 csid 大于 320，则表示 Basic Header 需要 3 个字节，此时 csid 范围 [64, 65599] */
if (h->csid >= 320) {
++hsize;
}
}
/* 将 out->buf->pos 指针指向 rtmp 消息的头部起始处 */
/* fill initial header */
out->buf->pos -= hsize;
p = out->buf->pos;
/* basic header */
*p = (fmt << 6);
if (h->csid >= 2 && h->csid <= 63) {
*p++ |= (((uint8_t)h->csid) & 0x3f);
} else if (h->csid >= 64 && h->csid < 320) {
++p;
*p++ = (uint8_t)(h->csid - 64);
} else {
*p++ |= 1;
*p++ = (uint8_t)(h->csid - 64);
*p++ = (uint8_t)((h->csid - 64) >> 8);
}
/* create fmt3 header for successive fragments */
thsize = p - out->buf->pos;
ngx_memcpy(th, out->buf->pos, thsize);
/* 提取出 fmt 值 */
th[0] |= 0xc0;
/* message header */
if (fmt <= 2) {
/* 此时 timestamp 存在*/
pp = (u_char*)×tamp;
*p++ = pp[2];
*p++ = pp[1];
*p++ = pp[0];
if (fmt <= 1) {
/* 此时 message type id 和 message length 存在 */
pp = (u_char*)&mlen;
*p++ = pp[2];
*p++ = pp[1];
*p++ = pp[0];
*p++ = h->type;
if (fmt == 0) {
/* 此时 message stream id 存在 */
pp = (u_char*)&h->msid;
*p++ = pp[0];
*p++ = pp[1];
*p++ = pp[2];
*p++ = pp[3];
}
}
}
/* 若 fmt 大于 2，则说明没有 message header */
/* extended header */
if (ext_timestamp) {
pp = (u_char*)&ext_timestamp;
*p++ = pp[3];
*p++ = pp[2];
*p++ = pp[1];
*p++ = pp[0];
/* This CONTRADICTS the standard
* but that's the way flash client
* wants data to be encoded;
* ffmpeg complains */
if (cscf->play_time_fix) {
ngx_memcpy(&th[thsize], p - 4, 4);
thsize += 4;
}
}
/* append headers to successive fragments */
for(out = out->next; out; out = out->next) {
out->buf->pos -= thsize;
ngx_memcpy(out->buf->pos, th, thsize);
}
}
2.3 ngx_rtmp_send_shared_packet
static ngx_int_t ngx_rtmp_send_shared_packet(ngx_rtmp_session_t *s, ngx_chain_t *cl)
{
ngx_rtmp_core_srv_conf_t *cscf;
ngx_int_t rc;
if (cl == NULL) {
return NGX_ERROR;
}
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
/* cl 中已经包含一个完整的将要发送给客户端的 rtmp 包 */
rc = ngx_rtmp_send_message(s, cl, 0);
/* 将 cl 的引用计数减 1，当为 0 时，则将其插入到 cscf->free 链表头中 */
ngx_rtmp_free_shared_chain(cscf, cl);
return rc;
}
2.3.1 ngx_rtmp_send_message
ngx_int_t ngx_rtmp_send_message(ngx_rtmp_session_t *s, ngx_chain_t *out,
ngx_uint_t priority)
{
ngx_uint_t nmsg;
/* 计算要发送的消息数 */
nmsg = (s->out_last - s->out_pos) % s->out_queue + 1;
if (priority > 3) {
priority = 3;
}
/* drop packet? 丢包
* Note we always leave 1 slot free */
if (nmsg + priority * s->out_queue / 4 >= s->out_queue) {
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"RTMP drop message bufs=%ui, priority=%ui",
nmsg, priority);
return NGX_AGAIN;
}
s->out[s->out_last++] = out;
s->out_last %= s->out_queue;
/* out 的引用计数加 1 */
ngx_rtmp_acquire_shared_chain(out);
ngx_log_debug3(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"RTMP send nmsg=%ui, priority=%ui #%ui",
nmsg, priority, s->out_last);
if (priority && s->out_buffer && nmsg < s->out_cork) {
return NGX_OK;
}
/* 若当前连接的 write 事件还没有活跃时，发送该 rtmp 包 */
if (!s->connection->write->active) {
ngx_rtmp_send(s->connection->write);
/*return ngx_add_event(s->connection->write, NGX_WRITE_EVENT, NGX_CLEAR_EVENT);*/
}
return NGX_OK;
}
2.3.2 ngx_rtmp_send
static void ngx_rtmp_send(ngx_event_t *wev)
{
ngx_connection_t *c;
ngx_rtmp_session_t *s;
ngx_int_t n;
ngx_rtmp_core_srv_conf_t *cscf;
c = wev->data;
s = c->data;
if (c->destroyed) {
return;
}
if (wev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
"client timed out");
c->timedout = 1;
ngx_rtmp_finalize_session(s);
return;
}
if (wev->timer_set) {
ngx_del_timer(wev);
}
if (s->out_chain == NULL && s->out_pos != s->out_last) {
/* 将保存着将要发送的 rtmp 包赋给 s->out_chain */
s->out_chain = s->out[s->out_pos];
s->out_bpos = s->out_chain->buf->pos;
}
while (s->out_chain) {
/* 调用 ngx_unix_send 回调函数发送 */
n = c->send(c, s->out_bpos, s->out_chain->buf->last - s->out_bpos);
if (n == NGX_AGAIN || n == 0) {
ngx_add_timer(c->write, s->timeout);
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
ngx_rtmp_finalize_session(s);
}
return;
}
if (n < 0) {
ngx_rtmp_finalize_session(s);
return;
}
s->out_bytes += n;
s->ping_reset = 1;
ngx_rtmp_update_bandwidth(&ngx_rtmp_bw_out, n);
s->out_bpos += n;
/* 若已经完全发送 */
if (s->out_bpos == s->out_chain->buf->last) {
/* 指向下一个 ngx_chian_t */
s->out_chain = s->out_chain->next;
/* 若不存在 */
if (s->out_chain == NULL) {
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
/* 则释放之前已经发送完成的 ngx_chain_t */
ngx_rtmp_free_shared_chain(cscf, s->out[s->out_pos]);
++s->out_pos;
s->out_pos %= s->out_queue;
/* 若相等，则表明所有消息的都发送了 */
if (s->out_pos == s->out_last) {
break;
}
s->out_chain = s->out[s->out_pos];
}
s->out_bpos = s->out_chain->buf->pos;
}
}
/* 若当前 写事件 是活跃的，则将其从 epoll 等事件监控机制中删除 */
if (wev->active) {
ngx_del_event(wev, NGX_WRITE_EVENT, 0);
}
/* 将 posted_dry_events 延迟队列上的事件都移除，并执行 */
ngx_event_process_posted((ngx_cycle_t *) ngx_cycle, &s->posted_dry_events);
}
2.3.3 ngx_rtmp_free_shared_chain
void ngx_rtmp_free_shared_chain(ngx_rtmp_core_srv_conf_t *cscf, ngx_chain_t *in)
{
ngx_chain_t *cl;
/* 引用计数减 1 */
if (ngx_rtmp_ref_put(in)) {
return;
}
/* 将 cl 插入到 cscf->free 链表头中 */
for (cl = in; ; cl = cl->next) {
if (cl->next == NULL) {
cl->next = cscf->free;
cscf->free = in;
return;
}
}
}
2.4 ngx_rtmp_send_bandwidth
ngx_int_t ngx_rtmp_send_bandwidth(ngx_rtmp_session_t *s, uint32_t ack_size,
uint8_t limit_type)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_bandwidth(s, ack_size, limit_type));
}
2.4.1 ngx_rtmp_create_bandwidth
ngx_chain_t *ngx_rtmp_create_bandwidth(ngx_rtmp_session_t *s, uint32_t ack_size,
uint8_t limit_type)
{
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"create: bandwidth ack_size=%uD limit=%d",
ack_size, (int)limit_type);
{
/* 创建发送缓存并初始化 rtmp 头部一些信心，如 message type、csid 等 */
NGX_RTMP_USER_START(s, NGX_RTMP_MSG_BANDWIDTH);
/* 填充将要发送的实际数据 */
NGX_RTMP_USER_OUT4(ack_size);
NGX_RTMP_USER_OUT1(limit_type);
/* 主要是构造 rtmp 头，形成完整的 rtmp 包 */
NGX_RTMP_USER_END(s);
}
}
2.4.2 NGX_RTMP_USER_OUT1
#define NGX_RTMP_USER_OUT1(v) \
*(__b->last++) = ((u_char*)&v)[0];
send bandwidth
2.5 ngx_rtmp_send_chunk_size
ngx_int_t ngx_rtmp_send_chunk_size(ngx_rtmp_session_t *s, uint32_t chunk_size)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_chunk_size(s, chunk_size));
}
2.5.1 ngx_rtmp_create_chunk_size
ngx_chain_t *ngx_rtmp_create_chunk_size(ngx_rtmp_session_t *s, uint32_t chunk_size)
{
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"chunk_size=%uD", chunk_size);
{
NGX_RTMP_USER_START(s, NGX_RTMP_MSG_CHUNK_SIZE);
NGX_RTMP_USER_OUT4(chunk_size);
NGX_RTMP_USER_END(s);
}
}
send chunk_size
2.6 ngx_rtmp_send_amf
ngx_int_t ngx_rtmp_send_amf(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_rtmp_amf_elt_t *elts, size_t nelts)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_amf(s, h, elts, nelts));
}
2.6.1 ngx_rtmp_create_amf
ngx_chain_t *ngx_rtmp_create_amf(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_rtmp_amf_elt_t *elts, size_t nelts)
{
ngx_chain_t *first;
ngx_int_t rc;
ngx_rtmp_core_srv_conf_t *cscf;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"create: amf nelts=%ui", nelts);
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
first = NULL;
/* 先将 amf 的数据写入到 */
rc = ngx_rtmp_append_amf(s, &first, NULL, elts, nelts);
if (rc != NGX_OK && first) {
ngx_rtmp_free_shared_chain(cscf, first);
first = NULL;
}
if (first) {
/* 最后将其封装成 rtmp 包 */
ngx_rtmp_prepare_message(s, h, NULL, first);
}
return first;
}
2.6.2 ngx_rtmp_append_amf
/* AMF sender */
/* NOTE: this function does not free shared bufs on error */
ngx_int_t ngx_rtmp_append_amf(ngx_rtmp_session_t *s,
ngx_chain_t **first, ngx_chain_t **last,
ngx_rtmp_amf_elt_t *elts, size_t nelts)
{
ngx_rtmp_amf_ctx_t act;
ngx_rtmp_core_srv_conf_t *cscf;
ngx_int_t rc;
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
memset(&act, 0, sizeof(act));
act.arg = cscf;
act.alloc = ngx_rtmp_alloc_amf_buf;
act.log = s->connection->log;
if (first) {
act.first = *first;
}
if (last) {
act.link = *last;
}
/* 将 elts 中的 amf 数据写入到 act 中 */
rc = ngx_rtmp_amf_write(&act, elts, nelts);
if (first) {
*first = act.first;
}
if (last) {
*last = act.link;
}
return rc;
}
send amf
2.7 ngx_rtmp_send_stream_begin
ngx_int_t
ngx_rtmp_send_stream_begin(ngx_rtmp_session_t *s, uint32_t msid)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_stream_begin(s, msid));
}
2.7.1 ngx_rtmp_create_stream_begin
/* User control messages */
ngx_chain_t *
ngx_rtmp_create_stream_begin(ngx_rtmp_session_t *s, uint32_t msid)
{
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"create: stream_begin msid=%uD", msid);
{
NGX_RTMP_UCTL_START(s, NGX_RTMP_MSG_USER, NGX_RTMP_USER_STREAM_BEGIN);
NGX_RTMP_USER_OUT4(msid);
NGX_RTMP_USER_END(s);
}
}
2.7.2 NGX_RTMP_UCTL_START
#define NGX_RTMP_UCTL_START(s, type, utype) \
NGX_RTMP_USER_START(s, type); \
*(__b->last++) = (u_char)((utype) >> 8); \
*(__b->last++) = (u_char)(utype);
send stream begin
2.8 ngx_rtmp_send_status
ngx_int_t
ngx_rtmp_send_status(ngx_rtmp_session_t *s, char *code, char* level, char *desc)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_status(s, code, level, desc));
}
2.8.1 ngx_rtmp_create_status
ngx_chain_t *
ngx_rtmp_create_status(ngx_rtmp_session_t *s, char *code, char* level,
char *desc)
{
ngx_rtmp_header_t h;
static double trans;
static ngx_rtmp_amf_elt_t out_inf[] = {
{ NGX_RTMP_AMF_STRING,
ngx_string("level"),
NULL, 0 },
{ NGX_RTMP_AMF_STRING,
ngx_string("code"),
NULL, 0 },
{ NGX_RTMP_AMF_STRING,
ngx_string("description"),
NULL, 0 },
};
static ngx_rtmp_amf_elt_t out_elts[] = {
{ NGX_RTMP_AMF_STRING,
ngx_null_string,
"onStatus", 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_null_string,
&trans, 0 },
{ NGX_RTMP_AMF_NULL,
ngx_null_string,
NULL, 0 },
{ NGX_RTMP_AMF_OBJECT,
ngx_null_string,
out_inf,
sizeof(out_inf) },
};
ngx_log_debug3(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"create: status code='%s' level='%s' desc='%s'",
code, level, desc);
out_inf[0].data = level;
out_inf[1].data = code;
out_inf[2].data = desc;
memset(&h, 0, sizeof(h));
h.type = NGX_RTMP_MSG_AMF_CMD;
h.csid = NGX_RTMP_CSID_AMF;
h.msid = NGX_RTMP_MSID;
return ngx_rtmp_create_amf(s, &h, out_elts,
sizeof(out_elts) / sizeof(out_elts[0]));
}
send onStatus
2.9 ngx_rtmp_send_recorded
ngx_int_t
ngx_rtmp_send_recorded(ngx_rtmp_session_t *s, uint32_t msid)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_recorded(s, msid));
}
2.9.1 ngx_rtmp_create_recorded
ngx_chain_t *
ngx_rtmp_create_recorded(ngx_rtmp_session_t *s, uint32_t msid)
{
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"create: recorded msid=%uD", msid);
{
NGX_RTMP_UCTL_START(s, NGX_RTMP_MSG_USER, NGX_RTMP_USER_RECORDED);
NGX_RTMP_USER_OUT4(msid);
NGX_RTMP_USER_END(s);
}
}
send record
2.10 ngx_rtmp_send_sample_access
ngx_int_t
ngx_rtmp_send_sample_access(ngx_rtmp_session_t *s)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_sample_access(s));
}
2.10.1 ngx_rtmp_create_sample_access
ngx_chain_t *
ngx_rtmp_create_sample_access(ngx_rtmp_session_t *s)
{
ngx_rtmp_header_t h;
static int access = 1;
static ngx_rtmp_amf_elt_t access_elts[] = {
{ NGX_RTMP_AMF_STRING,
ngx_null_string,
"|RtmpSampleAccess", 0 },
{ NGX_RTMP_AMF_BOOLEAN,
ngx_null_string,
&access, 0 },
{ NGX_RTMP_AMF_BOOLEAN,
ngx_null_string,
&access, 0 },
};
memset(&h, 0, sizeof(h));
h.type = NGX_RTMP_MSG_AMF_META;
h.csid = NGX_RTMP_CSID_AMF;
h.msid = NGX_RTMP_MSID;
return ngx_rtmp_create_amf(s, &h, access_elts,
sizeof(access_elts) / sizeof(access_elts[0]));
}
send sample access
2.11 ngx_rtmp_send_stream_eof
ngx_int_t
ngx_rtmp_send_stream_eof(ngx_rtmp_session_t *s, uint32_t msid)
{
return ngx_rtmp_send_shared_packet(s,
ngx_rtmp_create_stream_eof(s, msid));
}
2.11.1 ngx_rtmp_create_stream_eof
ngx_chain_t *
ngx_rtmp_create_stream_eof(ngx_rtmp_session_t *s, uint32_t msid)
{
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"create: stream_end msid=%uD", msid);
{
NGX_RTMP_UCTL_START(s, NGX_RTMP_MSG_USER, NGX_RTMP_USER_STREAM_EOF);
NGX_RTMP_USER_OUT4(msid);
NGX_RTMP_USER_END(s);
}
}
send stream eof
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