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ngx_http_flv_module.c
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ngx_http_flv_module.c
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define NGX_FLV_HEADER_SIGVER 0x464c5601
#define NGX_FLV_HEADER_VIDEO 0x01
#define NGX_FLV_HEADER_AUDIO 0x04
#define NGX_FLV_TAG_TYPE_AUDIO 0x08
#define NGX_FLV_TAG_TYPE_VIDEO 0x09
#define NGX_FLV_TAG_TYPE_META 0x12
#define NGX_FLV_TAG_TYPE_MASK 0x1f
#define NGX_FLV_PACKET_AVC 0x07
#define NGX_FLV_PACKET_AAC 0x0a
#define NGX_FLV_AUDIO_CODECID_MASK 0xf0
#define NGX_FLV_VIDEO_CODECID_MASK 0x0f
#define NGX_FLV_VIDEO_FRAMETYPE_MASK 0xf0
typedef struct {
u_char signature[3]; /* "FLV" */
u_char version[1]; /* 0x01 [version 1] */
u_char av_flags[1]; /* 0b00000 1[a] 0 1[v] */
u_char length[4]; /* 0x00000009 */
u_char tag_size[4]; /* 0x00000000 */
} ngx_flv_header_t;
typedef struct {
u_char type[1]; /* 0b00 0[filter] 00000[type] */
u_char size[3]; /* message length */
u_char timestamp[3]; /* pts in milliseconds */
u_char timestamp_ext[1]; /* upper 8 bits of timestamp */
u_char stream_id[3]; /* 0x000000 */
/* Audio: 0b0000[codec_id] 00[rate] 0[size] 0[type]
* Video: 0b0000[type] 0000[codec_id] */
u_char av_header[1];
/* Audio or Video: 0x00 is sequence_header */
u_char av_type[1];
} ngx_flv_tag_header_t;
/* NGX_FLV_HEADER_SIZE == NGX_FLV_TAG_HEADER_SIZE + NGX_FLV_PREV_TAG_SIZE */
#define NGX_FLV_HEADER_SIZE sizeof(ngx_flv_header_t)
#define NGX_FLV_PREV_TAG_SIZE 4
#define NGX_FLV_TAG_HEADER_SIZE 11
#define NGX_FLV_HEADER_LENGTH (NGX_FLV_HEADER_SIZE - NGX_FLV_PREV_TAG_SIZE)
#define ngx_flv_get_tag_size(p) \
( ((uint32_t) ((u_char *) (p))[0] << 16) \
+ ( ((u_char *) (p))[1] << 8) \
+ ( ((u_char *) (p))[2]) )
#define ngx_flv_get_timestamp(p) \
( ((uint32_t) ((u_char *) (p))[3] << 24) \
+ ( ((u_char *) (p))[0] << 16) \
+ ( ((u_char *) (p))[1] << 8) \
+ ( ((u_char *) (p))[2]) )
#define ngx_flv_get_32value(p) \
( ((uint32_t) ((u_char *) (p))[0] << 24) \
+ ( ((u_char *) (p))[1] << 16) \
+ ( ((u_char *) (p))[2] << 8) \
+ ( ((u_char *) (p))[3]) )
#define ngx_flv_get_64value(p) \
( ((uint64_t) ((u_char *) (p))[0] << 56) \
+ ((uint64_t) ((u_char *) (p))[1] << 48) \
+ ((uint64_t) ((u_char *) (p))[2] << 40) \
+ ((uint64_t) ((u_char *) (p))[3] << 32) \
+ ((uint64_t) ((u_char *) (p))[4] << 24) \
+ ( ((u_char *) (p))[5] << 16) \
+ ( ((u_char *) (p))[6] << 8) \
+ ( ((u_char *) (p))[7]) )
#define ngx_flv_validate_signature_version(p) \
(ngx_flv_get_32value(p) == NGX_FLV_HEADER_SIGVER)
#define ngx_flv_header_has_audio(p) \
(((u_char *) (p))[0] & NGX_FLV_HEADER_AUDIO)
#define ngx_flv_header_has_video(p) \
(((u_char *) (p))[0] & NGX_FLV_HEADER_VIDEO)
#define ngx_flv_tag_type(p) \
(((u_char *) (p))[0] & NGX_FLV_TAG_TYPE_MASK)
#define ngx_flv_tag_is_video(p) \
(ngx_flv_tag_type(p) == NGX_FLV_TAG_TYPE_VIDEO)
#define ngx_flv_tag_is_audio(p) \
(ngx_flv_tag_type(p) == NGX_FLV_TAG_TYPE_AUDIO)
#define ngx_flv_tag_is_meta(p) \
(ngx_flv_tag_type(p) == NGX_FLV_TAG_TYPE_META)
#define ngx_flv_is_sequence_header(p) (((u_char *) (p))[0] == 0x00)
#define ngx_flv_codec_is_avc(p) \
((((u_char *) (p))[0] & NGX_FLV_VIDEO_CODECID_MASK) == NGX_FLV_PACKET_AVC)
#define ngx_flv_video_frametype(p) \
((((u_char *) (p))[0] & NGX_FLV_VIDEO_FRAMETYPE_MASK) >> 4)
#define ngx_flv_video_is_keyframe(p) (ngx_flv_video_frametype(p) == 0x01)
#define ngx_flv_codec_is_aac(p) \
(((((u_char *) (p))[0] & NGX_FLV_AUDIO_CODECID_MASK) >> 4) \
== NGX_FLV_PACKET_AAC)
/* basic types */
#define NGX_FLV_AMF_NUMBER 0x00
#define NGX_FLV_AMF_BOOLEAN 0x01
#define NGX_FLV_AMF_STRING 0x02
#define NGX_FLV_AMF_OBJECT 0x03
#define NGX_FLV_AMF_NULL 0x05
#define NGX_FLV_AMF_ARRAY_NULL 0x06
#define NGX_FLV_AMF_MIXED_ARRAY 0x08
#define NGX_FLV_AMF_END 0x09
#define NGX_FLV_AMF_ARRAY 0x0a
/* extended types */
#define NGX_FLV_AMF_INT8 0x0100
#define NGX_FLV_AMF_INT16 0x0101
#define NGX_FLV_AMF_INT32 0x0102
#define NGX_FLV_AMF_VARIANT_ 0x0103
/* r/w flags */
#define NGX_FLV_AMF_OPTIONAL 0x1000
#define NGX_FLV_AMF_TYPELESS 0x2000
#define NGX_FLV_AMF_CONTEXT 0x4000
static ngx_inline double
ngx_flv_get_amf_number(u_char *p)
{
union {
uint64_t i;
double f;
} uint2double;
uint2double.i = ngx_flv_get_64value(p);
return uint2double.f;
}
typedef struct {
ngx_int_t type;
ngx_str_t name;
void *data;
size_t len;
} ngx_flv_amf_elt_t;
typedef struct {
size_t buffer_size;
size_t max_buffer_size;
ngx_flag_t time_offset;
ngx_flag_t with_metadata;
} ngx_http_flv_conf_t;
typedef struct {
ngx_file_t file;
ngx_http_request_t *request;
u_char *buffer;
u_char *buffer_start;
u_char *buffer_pos;
u_char *buffer_end;
size_t buffer_size;
off_t offset;
off_t file_end;
off_t sequence_end;
off_t necessary_len;
off_t start_offset;
off_t end_offset;
ngx_uint_t start;
ngx_uint_t end;
unsigned has_audio:1;
unsigned has_video:1;
unsigned met_audio:1;
unsigned met_video:1;
unsigned aac_audio:1;
unsigned avc_video:1;
unsigned with_metadata:1;
ngx_chain_t *necessary;
ngx_chain_t metadata;
ngx_chain_t audio_sequence_header;
ngx_chain_t video_sequence_header;
ngx_buf_t metadata_buf;
ngx_buf_t audio_sequence_buf;
ngx_buf_t video_sequence_buf;
u_char *filepositions;
u_char *times;
uint32_t filepositions_nelts;
uint32_t times_nelts;
} ngx_http_flv_file_t;
#define ngx_http_flv_tag_next(flv, n) \
flv->buffer_pos += (size_t) n; \
flv->offset += n
static ngx_int_t ngx_http_flv_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_flv_atofp(u_char *line, size_t n, size_t point);
static ngx_int_t ngx_http_flv_process(ngx_http_flv_file_t *flv);
static ngx_int_t ngx_http_flv_read(ngx_http_flv_file_t *flv, size_t size);
static ngx_int_t ngx_http_flv_read_header(ngx_http_flv_file_t *flv);
static ngx_int_t ngx_http_flv_read_metadata(ngx_http_flv_file_t *flv);
static ngx_int_t ngx_http_flv_read_tags(ngx_http_flv_file_t *flv);
static ngx_int_t ngx_http_flv_parse_metadata(ngx_http_flv_file_t *flv);
static off_t ngx_http_flv_timestamp_to_offset(ngx_http_flv_file_t *flv,
ngx_uint_t timestamp, ngx_uint_t start);
static void *ngx_flv_amf_reverse_copy(void *dst, void *src, size_t len);
static ngx_int_t ngx_flv_amf_is_compatible_type(uint8_t t1, uint8_t t2);
static ngx_int_t ngx_flv_amf_get(ngx_http_flv_file_t *flv, void *p, size_t n);
static ngx_int_t ngx_flv_amf_read(ngx_http_flv_file_t *flv,
ngx_flv_amf_elt_t *elts, size_t nelts);
static ngx_int_t ngx_flv_amf_read_object(ngx_http_flv_file_t *flv,
ngx_flv_amf_elt_t *elts, size_t nelts);
static ngx_int_t ngx_flv_amf_read_array(ngx_http_flv_file_t *flv,
ngx_flv_amf_elt_t *elts, size_t nelts);
static char *ngx_http_flv(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static void *ngx_http_flv_create_conf(ngx_conf_t *cf);
static char *ngx_http_flv_merge_conf(ngx_conf_t *cf, void *parent, void *child);
static ngx_command_t ngx_http_flv_commands[] = {
{ ngx_string("flv"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
ngx_http_flv,
0,
0,
NULL },
{ ngx_string("flv_time_offset"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_flv_conf_t, time_offset),
NULL },
{ ngx_string("flv_with_metadata"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_flv_conf_t, with_metadata),
NULL },
{ ngx_string("flv_buffer_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_flv_conf_t, buffer_size),
NULL },
{ ngx_string("flv_max_buffer_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_flv_conf_t, max_buffer_size),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_flv_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_flv_create_conf, /* create location configuration */
ngx_http_flv_merge_conf /* merge location configuration */
};
ngx_module_t ngx_http_flv_module = {
NGX_MODULE_V1,
&ngx_http_flv_module_ctx, /* module context */
ngx_http_flv_commands, /* module directives */
NGX_HTTP_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 u_char ngx_flv_header[] = "FLV\x1\x5\0\0\0\x9\0\0\0\0";
static ngx_int_t
ngx_http_flv_handler(ngx_http_request_t *r)
{
off_t start, end, len;
u_char *last;
size_t root;
ngx_str_t path, value;
ngx_log_t *log;
ngx_buf_t *b;
ngx_int_t rc, time_start, time_end;
ngx_uint_t level, i, time_offset;
ngx_chain_t out[2];
ngx_http_flv_file_t *flv;
ngx_http_flv_conf_t *conf;
ngx_open_file_info_t of;
ngx_http_core_loc_conf_t *clcf;
if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) {
return NGX_HTTP_NOT_ALLOWED;
}
if (r->uri.data[r->uri.len - 1] == '/') {
return NGX_DECLINED;
}
rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK) {
return rc;
}
last = ngx_http_map_uri_to_path(r, &path, &root, 0);
if (last == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
log = r->connection->log;
path.len = last - path.data;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
"http flv filename: \"%V\"", &path);
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
ngx_memzero(&of, sizeof(ngx_open_file_info_t));
of.read_ahead = clcf->read_ahead;
of.directio = clcf->directio;
of.valid = clcf->open_file_cache_valid;
of.min_uses = clcf->open_file_cache_min_uses;
of.errors = clcf->open_file_cache_errors;
of.events = clcf->open_file_cache_events;
if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
!= NGX_OK)
{
switch (of.err) {
case 0:
return NGX_HTTP_INTERNAL_SERVER_ERROR;
case NGX_ENOENT:
case NGX_ENOTDIR:
case NGX_ENAMETOOLONG:
level = NGX_LOG_ERR;
rc = NGX_HTTP_NOT_FOUND;
break;
case NGX_EACCES:
#if (NGX_HAVE_OPENAT)
case NGX_EMLINK:
case NGX_ELOOP:
#endif
level = NGX_LOG_ERR;
rc = NGX_HTTP_FORBIDDEN;
break;
default:
level = NGX_LOG_CRIT;
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
break;
}
if (rc != NGX_HTTP_NOT_FOUND || clcf->log_not_found) {
ngx_log_error(level, log, of.err,
"%s \"%s\" failed", of.failed, path.data);
}
return rc;
}
if (!of.is_file) {
if (ngx_close_file(of.fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
ngx_close_file_n " \"%s\" failed", path.data);
}
return NGX_DECLINED;
}
r->root_tested = !r->error_page;
conf = ngx_http_get_module_loc_conf(r, ngx_http_flv_module);
time_offset = (ngx_uint_t) conf->time_offset;
time_start = -1;
time_end = 0;
start = 0;
end = of.size;
len = of.size;
i = 1;
flv = NULL;
if (r->args.len) {
if (ngx_http_arg(r, (u_char *) "time_offset", 11, &value) == NGX_OK) {
time_offset = 1;
}
if (ngx_http_arg(r, (u_char *) "start", 5, &value) == NGX_OK) {
if (time_offset) {
time_start = ngx_http_flv_atofp(value.data, value.len, 3);
} else {
start = ngx_atoof(value.data, value.len);
if (start == NGX_ERROR || start >= len) {
start = 0;
}
if (start) {
len = sizeof(ngx_flv_header) - 1 + len - start;
i = 0;
}
}
}
if (time_offset
&& ngx_http_arg(r, (u_char *) "end", 3, &value) == NGX_OK)
{
time_end = ngx_http_flv_atofp(value.data, value.len, 3);
if (time_end >= 0 && time_start < 0) {
time_start = 0;
}
}
}
if (time_start >= 0) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, log, 0,
"http flv time_offset time_start=%i time_end=%i",
time_start, time_end);
if (time_end < time_start) {
/* denotes the file end */
time_end = NGX_MAX_INT_T_VALUE;
}
flv = ngx_pcalloc(r->pool, sizeof(ngx_http_flv_file_t));
if (flv == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
flv->file.fd = of.fd;
flv->file.name = path;
flv->file.log = r->connection->log;
flv->file_end = of.size;
flv->buffer_size = conf->buffer_size;
flv->with_metadata = conf->with_metadata;
flv->start = time_start;
flv->end = time_end;
flv->request = r;
switch (ngx_http_flv_process(flv)) {
case NGX_DECLINED:
if (flv->buffer) {
ngx_pfree(r->pool, flv->buffer);
}
ngx_pfree(r->pool, flv);
flv = NULL;
break;
case NGX_OK:
start = flv->start_offset;
end = flv->end_offset;
len = end - start;
if (start > 0) {
len += sizeof(ngx_flv_header) - 1 + flv->necessary_len;
i = 0;
}
break;
default: /* NGX_ERROR */
if (flv->buffer) {
ngx_pfree(r->pool, flv->buffer);
}
ngx_pfree(r->pool, flv);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
}
log->action = "sending flv to client";
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = len;
r->headers_out.last_modified_time = of.mtime;
if (ngx_http_set_etag(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (ngx_http_set_content_type(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (i == 0) {
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
b->pos = ngx_flv_header;
b->last = ngx_flv_header + sizeof(ngx_flv_header) - 1;
b->memory = 1;
out[0].buf = b;
out[0].next = &out[1];
if (flv && flv->necessary) {
out[0].next = flv->necessary;
while (flv->necessary->next) {
flv->necessary= flv->necessary->next;
}
flv->necessary->next = &out[1];
}
}
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
b->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t));
if (b->file == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
r->allow_ranges = 1;
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
b->file_pos = start;
b->file_last = end;
b->in_file = b->file_last ? 1: 0;
b->last_buf = (r == r->main) ? 1 : 0;
b->last_in_chain = 1;
b->file->fd = of.fd;
b->file->name = path;
b->file->log = log;
b->file->directio = of.is_directio;
out[1].buf = b;
out[1].next = NULL;
return ngx_http_output_filter(r, &out[i]);
}
static ngx_int_t
ngx_http_flv_atofp(u_char *line, size_t n, size_t point)
{
ngx_int_t value, cutoff, cutlim;
ngx_uint_t dot;
if (n == 0) {
return NGX_ERROR;
}
cutoff = NGX_MAX_INT_T_VALUE / 10;
cutlim = NGX_MAX_INT_T_VALUE % 10;
dot = 0;
for (value = 0; n--; line++) {
if (*line == '.') {
if (dot) {
return NGX_ERROR;
}
dot = 1;
continue;
}
if (*line < '0' || *line > '9') {
return NGX_ERROR;
}
if (dot && point == 0) {
continue;
}
if (value >= cutoff && (value > cutoff || *line - '0' > cutlim)) {
return NGX_ERROR;
}
value = value * 10 + (*line - '0');
point -= dot;
}
while (point--) {
if (value > cutoff) {
return NGX_ERROR;
}
value = value * 10;
}
return value;
}
static ngx_int_t
ngx_http_flv_process(ngx_http_flv_file_t *flv)
{
ngx_int_t rc;
ngx_chain_t **prev;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, flv->file.log, 0,
"flv start:%ui, end:%ui", flv->start, flv->end);
rc = ngx_http_flv_read_header(flv);
if (rc != NGX_OK) {
return rc;
}
rc = ngx_http_flv_read_metadata(flv);
if (rc != NGX_OK) {
return rc;
}
rc = ngx_http_flv_read_tags(flv);
if (rc != NGX_OK) {
return rc;
}
rc = ngx_http_flv_parse_metadata(flv);
if (rc != NGX_OK) {
return rc;
}
flv->start_offset = ngx_http_flv_timestamp_to_offset(flv, flv->start, 1);
flv->end_offset = ngx_http_flv_timestamp_to_offset(flv, flv->end, 0);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, flv->file.log, 0,
"flv start_offset:%O end_offset:%O",
flv->start_offset, flv->end_offset);
if (flv->end_offset <= flv->start_offset) {
return NGX_DECLINED;
}
prev = &flv->necessary;
if (flv->with_metadata && flv->metadata.buf) {
*prev = &flv->metadata;
prev = &flv->metadata.next;
flv->necessary_len += ngx_buf_size(flv->metadata.buf);
}
if (flv->audio_sequence_header.buf) {
*prev = &flv->audio_sequence_header;
prev = &flv->audio_sequence_header.next;
flv->necessary_len += ngx_buf_size(flv->audio_sequence_header.buf);
}
if (flv->video_sequence_header.buf) {
*prev = &flv->video_sequence_header;
flv->necessary_len += ngx_buf_size(flv->video_sequence_header.buf);
}
return NGX_OK;
}
static ngx_int_t
ngx_http_flv_read(ngx_http_flv_file_t *flv, size_t size)
{
ssize_t n;
if (flv->buffer_pos + size <= flv->buffer_end) {
return NGX_OK;
}
if (flv->offset + (off_t) flv->buffer_size > flv->file_end) {
flv->buffer_size = (size_t) (flv->file_end - flv->offset);
}
if (flv->buffer_size < size) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"\"%s\" flv file truncated", flv->file.name.data);
return NGX_ERROR;
}
if (flv->buffer == NULL) {
flv->buffer = ngx_palloc(flv->request->pool, flv->buffer_size);
if (flv->buffer == NULL) {
return NGX_ERROR;
}
flv->buffer_start = flv->buffer;
}
n = ngx_read_file(&flv->file, flv->buffer_start, flv->buffer_size,
flv->offset);
if (n == NGX_ERROR) {
return NGX_ERROR;
}
if ((size_t) n != flv->buffer_size) {
ngx_log_error(NGX_LOG_CRIT, flv->file.log, 0,
ngx_read_file_n " read only %z of %z from \"%s\"",
n, flv->buffer_size, flv->file.name.data);
return NGX_ERROR;
}
flv->buffer_pos = flv->buffer_start;
flv->buffer_end = flv->buffer_start + flv->buffer_size;
return NGX_OK;
}
static ngx_int_t
ngx_http_flv_read_header(ngx_http_flv_file_t *flv)
{
ngx_flv_header_t *hdr;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, flv->file.log, 0, "flv header");
if (ngx_http_flv_read(flv, NGX_FLV_HEADER_SIZE) != NGX_OK) {
return NGX_ERROR;
}
if (!ngx_flv_validate_signature_version(flv->buffer_pos)) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"flv wrong signature or version");
return NGX_ERROR;
}
hdr = (ngx_flv_header_t *) flv->buffer_pos;
if (ngx_flv_get_32value(hdr->length) != NGX_FLV_HEADER_LENGTH) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"flv wrong header length");
return NGX_ERROR;
}
if (ngx_flv_get_32value(hdr->tag_size) != 0) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"flv wrong header prev_tag size");
return NGX_ERROR;
}
flv->has_video = ngx_flv_header_has_video(hdr->av_flags);
flv->has_audio = ngx_flv_header_has_audio(hdr->av_flags);
ngx_http_flv_tag_next(flv, NGX_FLV_HEADER_SIZE);
return NGX_OK;
}
/*
* Small excess buffer to process tags after metadata.
*/
#define NGX_HTTP_FLV_META_BUFFER_EXCESS (16 * 1024)
static ngx_int_t
ngx_http_flv_read_metadata(ngx_http_flv_file_t *flv)
{
uint32_t size;
ngx_buf_t *buf;
ngx_http_flv_conf_t *conf;
ngx_flv_tag_header_t *tag;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, flv->file.log, 0, "flv metadata tag");
if (ngx_http_flv_read(flv, NGX_FLV_HEADER_SIZE) != NGX_OK) {
return NGX_ERROR;
}
tag = (ngx_flv_tag_header_t *) flv->buffer_pos;
size = NGX_FLV_TAG_HEADER_SIZE + ngx_flv_get_tag_size(tag->size)
+ NGX_FLV_PREV_TAG_SIZE;
if (!ngx_flv_tag_is_meta(tag->type)) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"flv first tag is not metadata");
return NGX_DECLINED;
}
if (size + NGX_HTTP_FLV_META_BUFFER_EXCESS > flv->buffer_size) {
conf = ngx_http_get_module_loc_conf(flv->request, ngx_http_flv_module);
if (size > conf->max_buffer_size) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"\"%s\" flv metadata tag is too large:%D, "
"you may want to increase flv_max_buffer_size",
flv->file.name.data, size);
return NGX_ERROR;
}
ngx_pfree(flv->request->pool, flv->buffer);
flv->buffer = NULL;
flv->buffer_pos = NULL;
flv->buffer_end = NULL;
flv->buffer_size = (size_t) size + NGX_HTTP_FLV_META_BUFFER_EXCESS;
}
if (ngx_http_flv_read(flv, (size_t) size) != NGX_OK) {
return NGX_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, flv->file.log, 0,
"flv metadata_len:%D", size);
buf = &flv->metadata_buf;
buf->temporary = 1;
buf->pos = flv->buffer_pos;
buf->last = flv->buffer_pos + size;
buf->start = buf->pos;
buf->end = buf->last;
flv->metadata.buf = buf;
ngx_http_flv_tag_next(flv, size);
return NGX_OK;
}
static ngx_int_t
ngx_http_flv_read_tags(ngx_http_flv_file_t *flv)
{
uint32_t size;
ngx_buf_t *buf;
ngx_flv_tag_header_t *tag;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, flv->file.log, 0, "flv av tag");
while (flv->buffer_pos + NGX_FLV_HEADER_SIZE < flv->buffer_end) {
if (ngx_http_flv_read(flv, NGX_FLV_HEADER_SIZE) != NGX_OK) {
return NGX_ERROR;
}
tag = (ngx_flv_tag_header_t *) flv->buffer_pos;
size = NGX_FLV_TAG_HEADER_SIZE + ngx_flv_get_tag_size(tag->size)
+ NGX_FLV_PREV_TAG_SIZE;
if (flv->buffer_pos + size > flv->buffer_end) {
break;
}
switch ngx_flv_tag_type(tag->type) {
case NGX_FLV_TAG_TYPE_AUDIO:
if (flv->met_audio) {
break;
}
flv->met_audio = 1;
flv->aac_audio = ngx_flv_codec_is_aac(tag->av_header);
if (!flv->aac_audio) {
break;
}
if (!ngx_flv_is_sequence_header(tag->av_type)) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"flv first audio tag is not sequence header");
return NGX_ERROR;
}
flv->sequence_end = flv->offset + size;
buf = &flv->audio_sequence_buf;
buf->temporary = 1;
buf->pos = flv->buffer_pos;
buf->last = flv->buffer_pos + size;
flv->audio_sequence_header.buf = buf;
break;
case NGX_FLV_TAG_TYPE_VIDEO:
if (flv->met_video) {
break;
}
flv->met_video = 1;
flv->avc_video = ngx_flv_codec_is_avc(tag->av_header);
if (!flv->avc_video) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"flv does not support time offset, avc required");
return NGX_DECLINED;
}
if (!ngx_flv_is_sequence_header(tag->av_type)) {
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"flv first video tag is not sequence header");
return NGX_ERROR;
}
flv->sequence_end = flv->offset + size;
buf = &flv->video_sequence_buf;
buf->temporary = 1;
buf->pos = flv->buffer_pos;
buf->last = flv->buffer_pos + size;
flv->video_sequence_header.buf = buf;
break;
default:
break;
}
if (flv->met_audio && flv->met_video) {
return NGX_OK;
}
ngx_http_flv_tag_next(flv, size);
}
ngx_log_error(NGX_LOG_ERR, flv->file.log, 0,
"flv no a/v tag found within %DB after metadata",
NGX_HTTP_FLV_META_BUFFER_EXCESS);
return NGX_DECLINED;
}
static ngx_int_t
ngx_http_flv_parse_metadata(ngx_http_flv_file_t *flv)
{
static u_char *filepositions_pos;
static u_char *times_pos;
static ngx_flv_amf_elt_t in_keyframes[] = {
{ NGX_FLV_AMF_ARRAY | NGX_FLV_AMF_CONTEXT,
ngx_string("filepositions"),
&filepositions_pos, 0 },
{ NGX_FLV_AMF_ARRAY | NGX_FLV_AMF_CONTEXT,