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/*
* Copyright (c) 2012 Roman Arutyunyan
*/
#include "ngx_rtmp_play_module.h"
#include "ngx_rtmp_codec_module.h"
#include "ngx_rtmp_streams.h"
static ngx_int_t ngx_rtmp_flv_postconfiguration(ngx_conf_t *cf);
static void ngx_rtmp_flv_read_meta(ngx_rtmp_session_t *s, ngx_file_t *f);
static ngx_int_t ngx_rtmp_flv_timestamp_to_offset(ngx_rtmp_session_t *s,
ngx_file_t *f, ngx_int_t timestamp);
static ngx_int_t ngx_rtmp_flv_init(ngx_rtmp_session_t *s, ngx_file_t *f);
static ngx_int_t ngx_rtmp_flv_start(ngx_rtmp_session_t *s, ngx_file_t *f);
static ngx_int_t ngx_rtmp_flv_seek(ngx_rtmp_session_t *s, ngx_file_t *f,
ngx_uint_t offset);
static ngx_int_t ngx_rtmp_flv_stop(ngx_rtmp_session_t *s, ngx_file_t *f);
static ngx_int_t ngx_rtmp_flv_send(ngx_rtmp_session_t *s, ngx_file_t *f,
ngx_uint_t *ts);
typedef struct {
ngx_uint_t nelts;
ngx_uint_t offset;
} ngx_rtmp_flv_index_t;
typedef struct {
ngx_int_t offset;
ngx_int_t start_timestamp;
ngx_event_t write_evt;
uint32_t last_audio;
uint32_t last_video;
ngx_uint_t msg_mask;
uint32_t epoch;
unsigned meta_read:1;
ngx_rtmp_flv_index_t filepositions;
ngx_rtmp_flv_index_t times;
} ngx_rtmp_flv_ctx_t;
#define NGX_RTMP_FLV_BUFFER (1024*1024)
#define NGX_RTMP_FLV_DEFAULT_BUFLEN 1000
#define NGX_RTMP_FLV_TAG_HEADER 11
#define NGX_RTMP_FLV_DATA_OFFSET 13
static u_char ngx_rtmp_flv_buffer[
NGX_RTMP_FLV_BUFFER];
static u_char ngx_rtmp_flv_header[
NGX_RTMP_FLV_TAG_HEADER];
static ngx_rtmp_module_t ngx_rtmp_flv_module_ctx = {
NULL, /* preconfiguration */
ngx_rtmp_flv_postconfiguration, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create app configuration */
NULL /* merge app configuration */
};
ngx_module_t ngx_rtmp_flv_module = {
NGX_MODULE_V1,
&ngx_rtmp_flv_module_ctx, /* module context */
NULL, /* 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
};
static ngx_int_t
ngx_rtmp_flv_fill_index(ngx_rtmp_amf_ctx_t *ctx, ngx_rtmp_flv_index_t *idx)
{
uint32_t nelts;
ngx_buf_t *b;
/* we have AMF array pointed by context;
* need to extract its size (4 bytes) &
* save offset of actual array data */
b = ctx->link->buf;
if (b->last - b->pos < (ngx_int_t) ctx->offset + 4) {
return NGX_ERROR;
}
ngx_rtmp_rmemcpy(&nelts, b->pos + ctx->offset, 4);
idx->nelts = nelts;
idx->offset = ctx->offset + 4;
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_flv_init_index(ngx_rtmp_session_t *s, ngx_chain_t *in)
{
ngx_rtmp_flv_ctx_t *ctx;
static ngx_rtmp_amf_ctx_t filepositions_ctx;
static ngx_rtmp_amf_ctx_t times_ctx;
static ngx_rtmp_amf_elt_t in_keyframes[] = {
{ NGX_RTMP_AMF_ARRAY | NGX_RTMP_AMF_CONTEXT,
ngx_string("filepositions"),
&filepositions_ctx, 0 },
{ NGX_RTMP_AMF_ARRAY | NGX_RTMP_AMF_CONTEXT,
ngx_string("times"),
&times_ctx, 0 }
};
static ngx_rtmp_amf_elt_t in_inf[] = {
{ NGX_RTMP_AMF_OBJECT,
ngx_string("keyframes"),
in_keyframes, sizeof(in_keyframes) }
};
static ngx_rtmp_amf_elt_t in_elts[] = {
{ NGX_RTMP_AMF_STRING,
ngx_null_string,
NULL, 0 },
{ NGX_RTMP_AMF_OBJECT,
ngx_null_string,
in_inf, sizeof(in_inf) },
};
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_flv_module);
if (ctx == NULL || in == NULL) {
return NGX_OK;
}
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: init index");
ngx_memzero(&filepositions_ctx, sizeof(filepositions_ctx));
ngx_memzero(&times_ctx, sizeof(times_ctx));
if (ngx_rtmp_receive_amf(s, in, in_elts,
sizeof(in_elts) / sizeof(in_elts[0])))
{
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: init index error");
return NGX_OK;
}
if (filepositions_ctx.link && ngx_rtmp_flv_fill_index(&filepositions_ctx,
&ctx->filepositions)
!= NGX_OK)
{
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: failed to init filepositions");
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: filepositions nelts=%ui offset=%ui",
ctx->filepositions.nelts, ctx->filepositions.offset);
if (times_ctx.link && ngx_rtmp_flv_fill_index(&times_ctx,
&ctx->times)
!= NGX_OK)
{
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: failed to init times");
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: times nelts=%ui offset=%ui",
ctx->times.nelts, ctx->times.offset);
return NGX_OK;
}
static double
ngx_rtmp_flv_index_value(void *src)
{
double v;
ngx_rtmp_rmemcpy(&v, src, 8);
return v;
}
static ngx_int_t
ngx_rtmp_flv_timestamp_to_offset(ngx_rtmp_session_t *s, ngx_file_t *f,
ngx_int_t timestamp)
{
ngx_rtmp_flv_ctx_t *ctx;
ssize_t n, size;
ngx_uint_t offset, index, ret, nelts;
double v;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_flv_module);
if (ctx == NULL) {
goto rewind;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: lookup index start timestamp=%i",
timestamp);
if (ctx->meta_read == 0) {
ngx_rtmp_flv_read_meta(s, f);
ctx->meta_read = 1;
}
if (timestamp <= 0 || ctx->filepositions.nelts == 0
|| ctx->times.nelts == 0)
{
goto rewind;
}
/* read index table from file given offset */
offset = NGX_RTMP_FLV_DATA_OFFSET + NGX_RTMP_FLV_TAG_HEADER +
ctx->times.offset;
/* index should fit in the buffer */
nelts = ngx_min(ctx->times.nelts, sizeof(ngx_rtmp_flv_buffer) / 9);
size = nelts * 9;
n = ngx_read_file(f, ngx_rtmp_flv_buffer, size, offset);
if (n != size) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: could not read times index");
goto rewind;
}
/*TODO: implement binary search */
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: lookup times nelts=%ui", nelts);
for (index = 0; index < nelts - 1; ++index) {
v = ngx_rtmp_flv_index_value(ngx_rtmp_flv_buffer +
index * 9 + 1) * 1000;
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: lookup times index=%ui value=%ui",
index, (ngx_uint_t) v);
if (timestamp < v) {
break;
}
}
if (index >= ctx->filepositions.nelts) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: index out of bounds: %ui>=%ui",
index, ctx->filepositions.nelts);
goto rewind;
}
/* take value from filepositions */
offset = NGX_RTMP_FLV_DATA_OFFSET + NGX_RTMP_FLV_TAG_HEADER +
ctx->filepositions.offset + index * 9;
n = ngx_read_file(f, ngx_rtmp_flv_buffer, 8, offset + 1);
if (n != 8) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: could not read filepositions index");
goto rewind;
}
ret = ngx_rtmp_flv_index_value(ngx_rtmp_flv_buffer);
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: lookup index timestamp=%i offset=%ui",
timestamp, ret);
return ret;
rewind:
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: lookup index timestamp=%i offset=begin",
timestamp);
return NGX_RTMP_FLV_DATA_OFFSET;
}
static void
ngx_rtmp_flv_read_meta(ngx_rtmp_session_t *s, ngx_file_t *f)
{
ngx_rtmp_flv_ctx_t *ctx;
ssize_t n;
ngx_rtmp_header_t h;
ngx_chain_t *out, in;
ngx_buf_t in_buf;
ngx_rtmp_core_srv_conf_t *cscf;
uint32_t size;
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_flv_module);
if (ctx == NULL) {
return;
}
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: read meta");
/* read tag header */
n = ngx_read_file(f, ngx_rtmp_flv_header, sizeof(ngx_rtmp_flv_header),
NGX_RTMP_FLV_DATA_OFFSET);
if (n != sizeof(ngx_rtmp_flv_header)) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: could not read metadata tag header");
return;
}
if (ngx_rtmp_flv_header[0] != NGX_RTMP_MSG_AMF_META) {
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: first tag is not metadata, giving up");
return;
}
ngx_memzero(&h, sizeof(h));
h.type = NGX_RTMP_MSG_AMF_META;
h.msid = NGX_RTMP_MSID;
h.csid = NGX_RTMP_CSID_AMF;
size = 0;
ngx_rtmp_rmemcpy(&size, ngx_rtmp_flv_header + 1, 3);
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: metadata size=%D", size);
if (size > sizeof(ngx_rtmp_flv_buffer)) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: too big metadata");
return;
}
/* read metadata */
n = ngx_read_file(f, ngx_rtmp_flv_buffer, size,
sizeof(ngx_rtmp_flv_header) +
NGX_RTMP_FLV_DATA_OFFSET);
if (n != (ssize_t) size) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: could not read metadata");
return;
}
/* prepare input chain */
ngx_memzero(&in, sizeof(in));
ngx_memzero(&in_buf, sizeof(in_buf));
in.buf = &in_buf;
in_buf.pos = ngx_rtmp_flv_buffer;
in_buf.last = ngx_rtmp_flv_buffer + size;
ngx_rtmp_flv_init_index(s, &in);
/* output chain */
out = ngx_rtmp_append_shared_bufs(cscf, NULL, &in);
ngx_rtmp_prepare_message(s, &h, NULL, out);
ngx_rtmp_send_message(s, out, 0);
ngx_rtmp_free_shared_chain(cscf, out);
}
static ngx_int_t
ngx_rtmp_flv_send(ngx_rtmp_session_t *s, ngx_file_t *f, ngx_uint_t *ts)
{
ngx_rtmp_flv_ctx_t *ctx;
uint32_t last_timestamp;
ngx_rtmp_header_t h, lh;
ngx_rtmp_core_srv_conf_t *cscf;
ngx_chain_t *out, in;
ngx_buf_t in_buf;
ngx_int_t rc;
ssize_t n;
uint32_t buflen, end_timestamp, size;
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_flv_module);
if (ctx == NULL) {
return NGX_ERROR;
}
if (ctx->offset == -1) {
ctx->offset = ngx_rtmp_flv_timestamp_to_offset(s, f,
ctx->start_timestamp);
ctx->start_timestamp = -1; /* set later from actual timestamp */
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: read tag at offset=%i", ctx->offset);
/* read tag header */
n = ngx_read_file(f, ngx_rtmp_flv_header,
sizeof(ngx_rtmp_flv_header), ctx->offset);
if (n != sizeof(ngx_rtmp_flv_header)) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: could not read flv tag header");
return NGX_DONE;
}
/* parse header fields */
ngx_memzero(&h, sizeof(h));
h.msid = NGX_RTMP_MSID;
h.type = ngx_rtmp_flv_header[0];
size = 0;
ngx_rtmp_rmemcpy(&size, ngx_rtmp_flv_header + 1, 3);
ngx_rtmp_rmemcpy(&h.timestamp, ngx_rtmp_flv_header + 4, 3);
((u_char *) &h.timestamp)[3] = ngx_rtmp_flv_header[7];
ctx->offset += (sizeof(ngx_rtmp_flv_header) + size + 4);
last_timestamp = 0;
switch (h.type) {
case NGX_RTMP_MSG_AUDIO:
h.csid = NGX_RTMP_CSID_AUDIO;
last_timestamp = ctx->last_audio;
ctx->last_audio = h.timestamp;
break;
case NGX_RTMP_MSG_VIDEO:
h.csid = NGX_RTMP_CSID_VIDEO;
last_timestamp = ctx->last_video;
ctx->last_video = h.timestamp;
break;
default:
return NGX_OK;
}
ngx_log_debug4(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: read tag type=%i size=%uD timestamp=%uD "
"last_timestamp=%uD",
(ngx_int_t) h.type,size, h.timestamp, last_timestamp);
lh = h;
lh.timestamp = last_timestamp;
if (size > sizeof(ngx_rtmp_flv_buffer)) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: too big message: %D>%uz", size,
sizeof(ngx_rtmp_flv_buffer));
goto next;
}
/* read tag body */
n = ngx_read_file(f, ngx_rtmp_flv_buffer, size,
ctx->offset - size - 4);
if (n != (ssize_t) size) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"flv: could not read flv tag");
return NGX_ERROR;
}
/* prepare input chain */
ngx_memzero(&in, sizeof(in));
ngx_memzero(&in_buf, sizeof(in_buf));
in.buf = &in_buf;
in_buf.pos = ngx_rtmp_flv_buffer;
in_buf.last = ngx_rtmp_flv_buffer + size;
/* output chain */
out = ngx_rtmp_append_shared_bufs(cscf, NULL, &in);
ngx_rtmp_prepare_message(s, &h, ctx->msg_mask & (1 << h.type) ?
&lh : NULL, out);
rc = ngx_rtmp_send_message(s, out, 0);
ngx_rtmp_free_shared_chain(cscf, out);
if (rc == NGX_AGAIN) {
return NGX_AGAIN;
}
if (rc != NGX_OK) {
return NGX_ERROR;
}
ctx->msg_mask |= (1 << h.type);
next:
if (ctx->start_timestamp == -1) {
ctx->start_timestamp = h.timestamp;
ctx->epoch = ngx_current_msec;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: start_timestamp=%i", ctx->start_timestamp);
return NGX_OK;
}
buflen = (s->buflen ? s->buflen : NGX_RTMP_FLV_DEFAULT_BUFLEN);
end_timestamp = (ngx_current_msec - ctx->epoch) +
ctx->start_timestamp + buflen;
ngx_log_debug5(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: %s wait=%D timestamp=%D end_timestamp=%D bufen=%i",
h.timestamp > end_timestamp ? "schedule" : "advance",
h.timestamp > end_timestamp ? h.timestamp - end_timestamp : 0,
h.timestamp, end_timestamp, (ngx_int_t) buflen);
/* too much data sent; schedule timeout */
if (h.timestamp > end_timestamp) {
return h.timestamp - end_timestamp;
}
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_flv_init(ngx_rtmp_session_t *s, ngx_file_t *f)
{
ngx_rtmp_flv_ctx_t *ctx;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_flv_module);
if (ctx == NULL) {
ctx = ngx_palloc(s->connection->pool, sizeof(ngx_rtmp_flv_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
}
ngx_rtmp_set_ctx(s, ctx, ngx_rtmp_flv_module);
}
ngx_memzero(ctx, sizeof(*ctx));
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_flv_start(ngx_rtmp_session_t *s, ngx_file_t *f)
{
ngx_rtmp_flv_ctx_t *ctx;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_flv_module);
if (ctx == NULL) {
return NGX_OK;
}
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: start");
ctx->offset = -1;
ctx->msg_mask = 0;
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_flv_seek(ngx_rtmp_session_t *s, ngx_file_t *f, ngx_uint_t timestamp)
{
ngx_rtmp_flv_ctx_t *ctx;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_flv_module);
if (ctx == NULL) {
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: seek timestamp=%ui", timestamp);
ctx->start_timestamp = timestamp;
ctx->offset = -1;
ctx->msg_mask = 0;
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_flv_stop(ngx_rtmp_session_t *s, ngx_file_t *f)
{
ngx_rtmp_flv_ctx_t *ctx;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_flv_module);
if (ctx == NULL) {
return NGX_OK;
}
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"flv: stop");
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_flv_postconfiguration(ngx_conf_t *cf)
{
ngx_rtmp_play_main_conf_t *pmcf;
ngx_rtmp_play_fmt_t **pfmt, *fmt;
pmcf = ngx_rtmp_conf_get_module_main_conf(cf, ngx_rtmp_play_module);
pfmt = ngx_array_push(&pmcf->fmts);
if (pfmt == NULL) {
return NGX_ERROR;
}
fmt = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_play_fmt_t));
if (fmt == NULL) {
return NGX_ERROR;
}
*pfmt = fmt;
ngx_str_set(&fmt->name, "flv-format");
ngx_str_null(&fmt->pfx); /* default fmt */
ngx_str_set(&fmt->sfx, ".flv");
fmt->init = ngx_rtmp_flv_init;
fmt->start = ngx_rtmp_flv_start;
fmt->seek = ngx_rtmp_flv_seek;
fmt->stop = ngx_rtmp_flv_stop;
fmt->send = ngx_rtmp_flv_send;
return NGX_OK;
}
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