zotan/nginx-mod-rtmp
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live stream synchronization

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This commit is contained in:
Roman Arutyunyan 2012-08-30 18:40:12 +04:00
parent 94fdac52a7
commit 96526896aa
4 changed files with 67 additions and 14 deletions
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5
hls/ngx_rtmp_hls_module.c
View file

@ -950,8 +950,9 @@ ngx_rtmp_hls_audio(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
--packet.size;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"hls: audio buffer %uD", *(uint32_t*)packet.data);
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"hls: audio dts=%L timestamp=%uD", (int64_t)packet.dts,
h->timestamp);
if (av_interleaved_write_frame(ctx->out_format, &packet) < 0) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,

6
ngx_rtmp_handler.c
View file

@ -694,9 +694,13 @@ ngx_rtmp_send_message(ngx_rtmp_session_t *s, ngx_chain_t *out,
nmsg = (s->out_last - s->out_pos) % s->out_queue + 1;
if (priority > 3) {
priority = 3;
}
/* drop packet?
* Note we always leave 1 slot free */
if (nmsg + priority * s->out_queue / 16 >= s->out_queue) {
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);

69
ngx_rtmp_live_module.c
View file

@ -53,6 +53,13 @@ static ngx_command_t ngx_rtmp_live_commands[] = {
offsetof(ngx_rtmp_live_app_conf_t, buflen),
NULL },
{ ngx_string("sync"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_live_app_conf_t, sync),
NULL },
ngx_null_command
};
@ -99,6 +106,7 @@ ngx_rtmp_live_create_app_conf(ngx_conf_t *cf)
lacf->meta = NGX_CONF_UNSET;
lacf->nbuckets = NGX_CONF_UNSET;
lacf->buflen = NGX_CONF_UNSET;
lacf->sync = NGX_CONF_UNSET;
return lacf;
}
@ -114,6 +122,7 @@ ngx_rtmp_live_merge_app_conf(ngx_conf_t *cf, void *parent, void *child)
ngx_conf_merge_value(conf->meta, prev->meta, 1);
ngx_conf_merge_value(conf->nbuckets, prev->nbuckets, 1024);
ngx_conf_merge_msec_value(conf->buflen, prev->buflen, 0);
ngx_conf_merge_msec_value(conf->sync, prev->sync, 0);
conf->pool = ngx_create_pool(4096, &cf->cycle->new_log);
if (conf->pool == NULL) {
@ -292,7 +301,7 @@ ngx_rtmp_live_av(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
{
ngx_rtmp_live_ctx_t *ctx, *pctx;
ngx_rtmp_codec_ctx_t *codec_ctx;
ngx_chain_t *out, *peer_out, *header_out,
ngx_chain_t *out, *peer_out, *header_out,
*pheader_out, *meta;
ngx_rtmp_core_srv_conf_t *cscf;
ngx_rtmp_live_app_conf_t *lacf;
@ -300,8 +309,10 @@ ngx_rtmp_live_av(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_rtmp_header_t ch, lh;
ngx_uint_t prio, peer_prio;
ngx_uint_t peers, dropped_peers;
size_t header_offset;
size_t header_offset, last_offset;
ngx_uint_t header_version, meta_version;
ngx_int_t diff_timestamp;
uint32_t *last;
lacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_live_module);
if (lacf == NULL) {
@ -345,14 +356,16 @@ ngx_rtmp_live_av(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ch.csid = NGX_RTMP_LIVE_CSID_VIDEO;
lh.timestamp = ctx->last_video;
ctx->last_video = ch.timestamp;
last_offset = offsetof(ngx_rtmp_live_ctx_t, last_video);
} else {
/* audio priority is the same as video key frame's */
prio = NGX_RTMP_VIDEO_KEY_FRAME;
prio = 0;
ch.csid = NGX_RTMP_LIVE_CSID_AUDIO;
lh.timestamp = ctx->last_audio;
ctx->last_audio = ch.timestamp;
last_offset = offsetof(ngx_rtmp_live_ctx_t, last_audio);
}
lh.csid = ch.csid;
diff_timestamp = ch.timestamp - lh.timestamp;
out = ngx_rtmp_append_shared_bufs(cscf, NULL, in);
ngx_rtmp_prepare_message(s, &ch, &lh, out);
@ -396,25 +409,39 @@ ngx_rtmp_live_av(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
}
++peers;
ss = pctx->session;
last = (uint32_t *)((u_char *)pctx + last_offset);
ch.timestamp = s->epoch + h->timestamp - ss->epoch;
/* send absolute frame */
if ((pctx->msg_mask & (1 << h->type)) == 0) {
ch.timestamp = ngx_current_msec - ss->epoch;
/* packet from the past for the peer */
if (s->epoch + h->timestamp < ss->epoch) {
ngx_log_debug3(NGX_LOG_DEBUG_RTMP, ss->connection->log, 0,
"live: av: %s packet from the past %uD < %uD",
h->type == NGX_RTMP_MSG_VIDEO ? "video" : "audio",
(uint32_t)(s->epoch + h->timestamp), (uint32_t)ss->epoch);
continue;
}
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, ss->connection->log, 0,
"live: av: abs %s timestamp=%uD",
h->type == NGX_RTMP_MSG_VIDEO ? "video" : "audio",
ch.timestamp);
/* send codec header as abs frame if any */
peer_out = ngx_rtmp_append_shared_bufs(cscf, NULL,
header_out ? header_out : in);
ngx_rtmp_prepare_message(s, &ch, NULL, peer_out);
pctx->msg_mask |= (1 << h->type);
if (ngx_rtmp_send_message(ss, peer_out, prio) == NGX_OK
&& header_out)
{
*(ngx_uint_t *)((u_char *)pctx + header_offset)
= header_version;
if (ngx_rtmp_send_message(ss, peer_out, prio) == NGX_OK) {
pctx->msg_mask |= (1 << h->type);
if (header_out) {
*(ngx_uint_t *)((u_char *)pctx + header_offset)
= header_version;
*last = ch.timestamp;
}
}
ngx_rtmp_free_shared_chain(cscf, peer_out);
continue;
}
@ -445,7 +472,27 @@ ngx_rtmp_live_av(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
if (ngx_rtmp_send_message(ss, out, peer_prio) != NGX_OK) {
++pctx->dropped;
++dropped_peers;
continue;
}
*last += diff_timestamp;
if (lacf->sync == 0 || *last + lacf->sync >= ch.timestamp) {
continue;
}
/* send absolute frame to sync stream */
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, ss->connection->log, 0,
"live: av: sync %s: %i",
h->type == NGX_RTMP_MSG_VIDEO ? "video" : "audio",
(ngx_int_t) (ch.timestamp - *last));
peer_out = ngx_rtmp_alloc_shared_buf(cscf);
ngx_rtmp_prepare_message(s, &ch, NULL, peer_out);
if (ngx_rtmp_send_message(ss, peer_out, 0) == NGX_OK) {
*last = ch.timestamp;
}
ngx_rtmp_free_shared_chain(cscf, peer_out);
}
ngx_rtmp_free_shared_chain(cscf, out);

1
ngx_rtmp_live_module.h
View file

@ -54,6 +54,7 @@ typedef struct {
ngx_rtmp_live_stream_t **streams;
ngx_flag_t live;
ngx_flag_t meta;
ngx_msec_t sync;
ngx_msec_t buflen;
ngx_pool_t *pool;
ngx_rtmp_live_stream_t *free_streams;