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ngx_rtmp_codec_module.c
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ngx_rtmp_codec_module.c
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/*
* Original work Copyright (C) Roman Arutyunyan
* Modified work Copyright (C) 2017 Gnolizuh
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp_codec_module.h"
#include "ngx_rtmp_live_module.h"
#include "ngx_rtmp_cmd_module.h"
#include "ngx_rtmp_bitop.h"
#include "hls/ngx_rtmp_hls_module.h"
#define NGX_RTMP_CODEC_META_OFF 0
#define NGX_RTMP_CODEC_META_ON 1
#define NGX_RTMP_CODEC_META_COPY 2
#define MAX_SPS_COUNT 32
static void * ngx_rtmp_codec_create_app_conf(ngx_conf_t *cf);
static char * ngx_rtmp_codec_merge_app_conf(ngx_conf_t *cf,
void *parent, void *child);
static ngx_int_t ngx_rtmp_codec_postconfiguration(ngx_conf_t *cf);
static ngx_int_t ngx_rtmp_codec_construct_meta(ngx_rtmp_session_t *s);
static ngx_int_t ngx_rtmp_codec_reconstruct_meta(ngx_rtmp_session_t *s);
static ngx_int_t ngx_rtmp_codec_copy_meta(ngx_rtmp_session_t *s,
ngx_rtmp_header_t *h, ngx_chain_t *in);
static ngx_int_t ngx_rtmp_codec_prepare_meta(ngx_rtmp_session_t *s,
uint32_t timestamp);
static void ngx_rtmp_codec_parse_aac_header(ngx_rtmp_session_t *s,
ngx_chain_t *in);
static void ngx_rtmp_codec_parse_avc_header(ngx_rtmp_session_t *s,
ngx_chain_t *in);
static void ngx_rtmp_codec_parse_hevc_header(ngx_rtmp_session_t*s,
ngx_chain_t *in);
static void ngx_rtmp_codec_parse_hevc_profile_tier_level(ngx_rtmp_bit_reader_t *br,
ngx_uint_t max_sub_layers);
#if (NGX_DEBUG)
static void ngx_rtmp_codec_dump_header(ngx_rtmp_session_t *s, const char *type,
ngx_chain_t *in);
#endif
typedef struct {
ngx_uint_t meta;
} ngx_rtmp_codec_app_conf_t;
static ngx_conf_enum_t ngx_rtmp_codec_meta_slots[] = {
{ ngx_string("off"), NGX_RTMP_CODEC_META_OFF },
{ ngx_string("on"), NGX_RTMP_CODEC_META_ON },
{ ngx_string("copy"), NGX_RTMP_CODEC_META_COPY },
{ ngx_null_string, 0 }
};
static ngx_command_t ngx_rtmp_codec_commands[] = {
{ ngx_string("meta"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_SVI_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
ngx_conf_set_enum_slot,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_codec_app_conf_t, meta),
&ngx_rtmp_codec_meta_slots },
ngx_null_command
};
static ngx_rtmp_module_t ngx_rtmp_codec_module_ctx = {
NULL, /* preconfiguration */
ngx_rtmp_codec_postconfiguration, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create service configuration */
NULL, /* merge service configuration */
ngx_rtmp_codec_create_app_conf, /* create app configuration */
ngx_rtmp_codec_merge_app_conf /* merge app configuration */
};
ngx_module_t ngx_rtmp_codec_module = {
NGX_MODULE_V1,
&ngx_rtmp_codec_module_ctx, /* module context */
ngx_rtmp_codec_commands, /* 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 const char *
audio_codecs[] = {
"",
"ADPCM",
"MP3",
"LinearLE",
"Nellymoser16",
"Nellymoser8",
"Nellymoser",
"G711A",
"G711U",
"",
"AAC",
"Speex",
"",
"",
"MP3-8K",
"DeviceSpecific",
"Uncompressed"
};
static const char *
video_codecs[] = {
"",
"Jpeg",
"Sorenson-H263",
"ScreenVideo",
"On2-VP6",
"On2-VP6-Alpha",
"ScreenVideo2",
"H264",
};
u_char *
ngx_rtmp_get_audio_codec_name(ngx_uint_t id)
{
return (u_char *)(id < sizeof(audio_codecs) / sizeof(audio_codecs[0])
? audio_codecs[id]
: "");
}
u_char *
ngx_rtmp_get_video_codec_name(ngx_uint_t id)
{
return (u_char *)(id < sizeof(video_codecs) / sizeof(video_codecs[0])
? video_codecs[id]
: "");
}
static ngx_uint_t
ngx_rtmp_codec_get_next_version()
{
ngx_uint_t v;
static ngx_uint_t version;
do {
v = ++version;
} while (v == 0);
return v;
}
static ngx_int_t
ngx_rtmp_codec_disconnect(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_chain_t *in)
{
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_core_srv_conf_t *cscf;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (ctx == NULL) {
return NGX_OK;
}
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
if (ctx->video_header) {
ngx_rtmp_free_shared_chain(cscf, ctx->video_header);
ctx->video_header = NULL;
}
if (ctx->aac_header) {
ngx_rtmp_free_shared_chain(cscf, ctx->aac_header);
ctx->aac_header = NULL;
}
if (ctx->meta) {
ngx_rtmp_free_shared_chain(cscf, ctx->meta);
ctx->meta = NULL;
}
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_codec_av(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_chain_t *in)
{
ngx_rtmp_core_srv_conf_t *cscf;
ngx_rtmp_codec_ctx_t *ctx;
ngx_chain_t **header;
uint8_t fmt;
static ngx_uint_t sample_rates[] =
{ 5512, 11025, 22050, 44100 };
if (h->type != NGX_RTMP_MSG_AUDIO && h->type != NGX_RTMP_MSG_VIDEO) {
return NGX_OK;
}
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (ctx == NULL) {
ctx = ngx_pcalloc(s->connection->pool, sizeof(ngx_rtmp_codec_ctx_t));
ngx_rtmp_set_ctx(s, ctx, ngx_rtmp_codec_module);
}
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
/* save codec */
if (in->buf->last - in->buf->pos < 1) {
return NGX_OK;
}
fmt = in->buf->pos[0];
if (h->type == NGX_RTMP_MSG_AUDIO) {
ctx->audio_codec_id = (fmt & 0xf0) >> 4;
ctx->audio_channels = (fmt & 0x01) + 1;
ctx->sample_size = (fmt & 0x02) ? 2 : 1;
if (ctx->sample_rate == 0) {
ctx->sample_rate = sample_rates[(fmt & 0x0c) >> 2];
}
} else {
ctx->video_codec_id = (fmt & 0x0f);
}
/* save AVC/AAC header */
if (in->buf->last - in->buf->pos < 3) {
return NGX_OK;
}
/* no conf */
if (!ngx_rtmp_is_codec_header(in)) {
return NGX_OK;
}
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
header = NULL;
// MUST be audio / video sequence header.
if (h->type == NGX_RTMP_MSG_AUDIO) {
if (ctx->audio_codec_id == NGX_RTMP_AUDIO_AAC) {
header = &ctx->aac_header;
ngx_rtmp_codec_parse_aac_header(s, in);
}
} else {
header = &ctx->video_header;
if (ctx->video_codec_id == NGX_RTMP_VIDEO_H264) {
ngx_rtmp_codec_parse_avc_header(s, in);
} else if (ctx->video_codec_id == NGX_RTMP_VIDEO_H265){
ngx_rtmp_codec_parse_hevc_header(s, in);
}
}
if (header == NULL) {
return NGX_OK;
} else {
// when we got sequence header, try construct new meta if meta was not arrived.
ngx_rtmp_codec_construct_meta(s);
}
if (*header) {
ngx_rtmp_free_shared_chain(cscf, *header);
}
*header = ngx_rtmp_append_shared_bufs(cscf, NULL, in);
return NGX_OK;
}
static void
ngx_rtmp_codec_parse_aac_header(ngx_rtmp_session_t *s, ngx_chain_t *in)
{
ngx_uint_t idx;
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_bit_reader_t br;
static ngx_uint_t aac_sample_rates[] =
{ 96000, 88200, 64000, 48000,
44100, 32000, 24000, 22050,
16000, 12000, 11025, 8000,
7350, 0, 0, 0 };
#if (NGX_DEBUG)
ngx_rtmp_codec_dump_header(s, "aac", in);
#endif
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
ngx_rtmp_bit_init_reader(&br, in->buf->pos, in->buf->last);
ngx_rtmp_bit_read(&br, 16);
ctx->aac_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 5);
if (ctx->aac_profile == 31) {
ctx->aac_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 6) + 32;
}
idx = (ngx_uint_t) ngx_rtmp_bit_read(&br, 4);
if (idx == 15) {
ctx->sample_rate = (ngx_uint_t) ngx_rtmp_bit_read(&br, 24);
} else {
ctx->sample_rate = aac_sample_rates[idx];
}
ctx->aac_chan_conf = (ngx_uint_t) ngx_rtmp_bit_read(&br, 4);
if (ctx->aac_profile == 5 || ctx->aac_profile == 29) {
if (ctx->aac_profile == 29) {
ctx->aac_ps = 1;
}
ctx->aac_sbr = 1;
idx = (ngx_uint_t) ngx_rtmp_bit_read(&br, 4);
if (idx == 15) {
ctx->sample_rate = (ngx_uint_t) ngx_rtmp_bit_read(&br, 24);
} else {
ctx->sample_rate = aac_sample_rates[idx];
}
ctx->aac_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 5);
if (ctx->aac_profile == 31) {
ctx->aac_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 6) + 32;
}
}
/* MPEG-4 Audio Specific Config
5 bits: object type
if (object type == 31)
6 bits + 32: object type
4 bits: frequency index
if (frequency index == 15)
24 bits: frequency
4 bits: channel configuration
if (object_type == 5)
4 bits: frequency index
if (frequency index == 15)
24 bits: frequency
5 bits: object type
if (object type == 31)
6 bits + 32: object type
var bits: AOT Specific Config
*/
ngx_log_debug3(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: aac header profile=%ui, "
"sample_rate=%ui, chan_conf=%ui",
ctx->aac_profile, ctx->sample_rate, ctx->aac_chan_conf);
}
static void
ngx_rtmp_codec_parse_avc_header(ngx_rtmp_session_t *s, ngx_chain_t *in)
{
ngx_uint_t profile_idc, width, height, crop_left, crop_right,
crop_top, crop_bottom, frame_mbs_only, n, chroma_format_idc,
num_ref_frames;
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_bit_reader_t br;
#if (NGX_DEBUG)
ngx_rtmp_codec_dump_header(s, "avc", in);
#endif
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
ngx_rtmp_bit_init_reader(&br, in->buf->pos, in->buf->last);
ngx_rtmp_bit_read(&br, 48);
ctx->vc_profile = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
ctx->vc_compat = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
ctx->vc_level = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
/* nal bytes */
ctx->vc_nal_bytes = (ngx_uint_t) ((ngx_rtmp_bit_read_8(&br) & 0x03) + 1);
/* nnals */
if ((ngx_rtmp_bit_read_8(&br) & 0x1f) == 0) {
return;
}
/* nal size */
ngx_rtmp_bit_read(&br, 16);
/* nal type */
if (ngx_rtmp_bit_read_8(&br) != 0x67) {
return;
}
/* SPS */
/* profile idc */
profile_idc = (ngx_uint_t) ngx_rtmp_bit_read(&br, 8);
/* flags */
ngx_rtmp_bit_read(&br, 8);
/* level idc */
ngx_rtmp_bit_read(&br, 8);
/* SPS id */
ngx_rtmp_bit_read_golomb(&br);
if (profile_idc == 100 || profile_idc == 110 ||
profile_idc == 122 || profile_idc == 244 || profile_idc == 44 ||
profile_idc == 83 || profile_idc == 86 || profile_idc == 118)
{
/* chroma format idc */
chroma_format_idc = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
if (chroma_format_idc == 3) {
/* separate color plane */
ngx_rtmp_bit_read(&br, 1);
}
/* bit depth luma - 8 */
ngx_rtmp_bit_read_golomb(&br);
/* bit depth chroma - 8 */
ngx_rtmp_bit_read_golomb(&br);
/* qpprime y zero transform bypass */
ngx_rtmp_bit_read(&br, 1);
/* seq scaling matrix present */
if (ngx_rtmp_bit_read(&br, 1)) {
for (n = 0; n < (chroma_format_idc != 3 ? 8u : 12u); n++) {
/* seq scaling list present */
if (ngx_rtmp_bit_read(&br, 1)) {
/* TODO: scaling_list()
if (n < 6) {
} else {
}
*/
}
}
}
}
/* log2 max frame num */
ngx_rtmp_bit_read_golomb(&br);
/* pic order cnt type */
switch (ngx_rtmp_bit_read_golomb(&br)) {
case 0:
/* max pic order cnt */
ngx_rtmp_bit_read_golomb(&br);
break;
case 1:
/* delta pic order always zero */
ngx_rtmp_bit_read(&br, 1);
/* offset for non-ref pic */
ngx_rtmp_bit_read_golomb(&br);
/* offset for top to bottom field */
ngx_rtmp_bit_read_golomb(&br);
/* num ref frames in pic order */
num_ref_frames = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
for (n = 0; n < num_ref_frames; n++) {
/* offset for ref frame */
ngx_rtmp_bit_read_golomb(&br);
}
}
/* num ref frames */
ctx->vc_ref_frames = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
/* gaps in frame num allowed */
ngx_rtmp_bit_read(&br, 1);
/* pic width in mbs - 1 */
width = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
/* pic height in map units - 1 */
height = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
/* frame mbs only flag */
frame_mbs_only = (ngx_uint_t) ngx_rtmp_bit_read(&br, 1);
if (!frame_mbs_only) {
/* mbs adaprive frame field */
ngx_rtmp_bit_read(&br, 1);
}
/* direct 8x8 inference flag */
ngx_rtmp_bit_read(&br, 1);
/* frame cropping */
if (ngx_rtmp_bit_read(&br, 1)) {
crop_left = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
crop_right = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
crop_top = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
crop_bottom = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
} else {
crop_left = 0;
crop_right = 0;
crop_top = 0;
crop_bottom = 0;
}
ctx->width = (width + 1) * 16 - (crop_left + crop_right) * 2;
ctx->height = (2 - frame_mbs_only) * (height + 1) * 16 -
(crop_top + crop_bottom) * 2;
ngx_log_debug7(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: avc header "
"profile=%ui, compat=%ui, level=%ui, "
"nal_bytes=%ui, ref_frames=%ui, width=%ui, height=%ui",
ctx->vc_profile, ctx->vc_compat, ctx->vc_level,
ctx->vc_nal_bytes, ctx->vc_ref_frames,
ctx->width, ctx->height);
}
/***
* aligned(8) class HEVCDecoderConfigurationRecord
* {
* unsigned int(8) configurationVersion = 1;
* unsigned int(2) general_profile_space;
* unsigned int(1) general_tier_flag;
* unsigned int(5) general_profile_idc;
* unsigned int(32) general_profile_compatibility_flags;
* unsigned int(48) general_constraint_indicator_flags;
* unsigned int(8) general_level_idc;
* bit(4) reserved = ‘1111’b;
* unsigned int(12) min_spatial_segmentation_idc;
* bit(6) reserved = ‘111111’b;
* unsigned int(2) parallelismType;
* bit(6) reserved = ‘111111’b;
* unsigned int(2) chroma_format_idc;
* bit(5) reserved = ‘11111’b;
* unsigned int(3) bit_depth_luma_minus8;
* bit(5) reserved = ‘11111’b;
* unsigned int(3) bit_depth_chroma_minus8;
* bit(16) avgFrameRate;
* bit(2) constantFrameRate;
* bit(3) numTemporalLayers;
* bit(1) temporalIdNested;
* unsigned int(2) lengthSizeMinusOne;
* unsigned int(8) numOfArrays;
* for (j=0; j < numOfArrays; j++)
* {
* bit(1) array_completeness;
* unsigned int(1) reserved = 0;
* unsigned int(6) NAL_unit_type;
* unsigned int(16) numNalus;
* for (i=0; i< numNalus; i++)
* {
* unsigned int(16) nalUnitLength;
* bit(8*nalUnitLength) nalUnit;
* }
* }
* }
***/
static void
ngx_rtmp_codec_parse_hevc_header(ngx_rtmp_session_t *s, ngx_chain_t *in)
{
ngx_uint_t num_of_arrays, nal_type, nal_num, nal_len,
max_sub_layers, chroma_format_idc, separate_colour_plane_flag,
width, height, crop_left, crop_right,
crop_top, crop_bottom, sub_width_c, sub_height_c, n, m;
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_bit_reader_t br;
#if (NGX_DEBUG)
ngx_rtmp_codec_dump_header(s, "hevc", in);
#endif
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
ngx_rtmp_bit_init_reader(&br, in->buf->pos, in->buf->last);
ngx_rtmp_bit_read(&br, 48 + 3 /* skip profile_space & tier_flag */);
ctx->vc_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 5);
ctx->vc_compat = (ngx_uint_t) ngx_rtmp_bit_read_32(&br);
ngx_rtmp_bit_read(&br, 48);
ctx->vc_level = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
ngx_rtmp_bit_read(&br, 64);
/* nal bytes */
ctx->vc_nal_bytes = (ngx_uint_t) ((ngx_rtmp_bit_read_8(&br) & 0x03) + 1);
/* numOfArrays */
num_of_arrays = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
nal_type = 0;
nal_num = 0;
for (n = 0; n < num_of_arrays; n++) {
nal_type = (ngx_uint_t) ngx_rtmp_bit_read_8(&br) & 0x3f;
nal_num = (ngx_uint_t) ngx_rtmp_bit_read(&br, 16);
if (nal_type == HEVC_NAL_SPS) {
break;
}
for (m = 0; m < nal_num; m++) {
nal_len = (ngx_uint_t) ngx_rtmp_bit_read(&br, 16);
if (br.pos + nal_len >= br.last) {
return;
}
br.pos += nal_len;
}
}
if (nal_type != HEVC_NAL_SPS ||
nal_num == 0) {
return;
}
/* nalUnitLength */
if (!((ngx_uint_t) ngx_rtmp_bit_read(&br, 16) > 0)) {
return;
}
/* SPS NAL unit header */
/* forbidden zero bit */
ngx_rtmp_bit_read(&br, 1);
nal_type = (ngx_uint_t) ngx_rtmp_bit_read(&br, 6);
if (nal_type != HEVC_NAL_SPS) {
return;
}
/* nuh layer id */
ngx_rtmp_bit_read(&br, 6);
/* nuh temporal id plus1 */
ngx_rtmp_bit_read(&br, 3);
/* SPS */
/* vps id */
ngx_rtmp_bit_read(&br, 4);
/* sps_max_sub_layers_minus1 */
max_sub_layers = (ngx_uint_t) ngx_rtmp_bit_read(&br, 3);
/* sps_temporal_id_nesting_flag */
ngx_rtmp_bit_read(&br, 1);
ngx_rtmp_codec_parse_hevc_profile_tier_level(&br, max_sub_layers);
/* sps_seq_parameter_set_id */
ngx_rtmp_bit_read_golomb(&br);
separate_colour_plane_flag = 0;
/* chroma_format_idc */
chroma_format_idc = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
if (chroma_format_idc == 3) {
separate_colour_plane_flag = (ngx_uint_t) ngx_rtmp_bit_read(&br, 1);
}
sub_width_c = (chroma_format_idc == 1 || chroma_format_idc == 2) && separate_colour_plane_flag == 0 ? 2 : 1;
sub_height_c = chroma_format_idc == 1 && separate_colour_plane_flag == 0 ? 2 : 1;
/* pic width in luma samples */
width = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
/* pic height in luma samples */
height = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
/* conformance window flag */
if (ngx_rtmp_bit_read(&br, 1)) {
crop_left = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br) * 2;
crop_right = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br) * 2;
crop_top = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br) * 2;
crop_bottom = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br) * 2;
} else {
crop_left = 0;
crop_right = 0;
crop_top = 0;
crop_bottom = 0;
}
ctx->width = width - (sub_width_c * crop_left + sub_width_c * crop_right);
ctx->height = height - (sub_height_c * crop_top + sub_height_c * crop_bottom);
ngx_log_debug7(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: hevc header "
"profile=%ui, compat=%ui, level=%ui, "
"nal_bytes=%ui, ref_frames=%ui, width=%ui, height=%ui",
ctx->vc_profile, ctx->vc_compat, ctx->vc_level,
ctx->vc_nal_bytes, ctx->vc_ref_frames,
ctx->width, ctx->height);
}
#define MAX_SUB_LAYERS 7
static void
ngx_rtmp_codec_parse_hevc_profile_tier_level(ngx_rtmp_bit_reader_t *br, ngx_uint_t max_sub_layers_minus1)
{
ngx_uint_t i;
ngx_uint_t sub_layer_profile_present_flag[MAX_SUB_LAYERS];
ngx_uint_t sub_layer_level_present_flag[MAX_SUB_LAYERS];
ngx_rtmp_bit_read(br, 96);
for (i = 0; i < max_sub_layers_minus1; i++) {
sub_layer_profile_present_flag[i] = (ngx_uint_t) ngx_rtmp_bit_read(br, 1);
sub_layer_level_present_flag[i] = (ngx_uint_t) ngx_rtmp_bit_read(br, 1);
}
if (max_sub_layers_minus1 > 0) {
for (i = max_sub_layers_minus1; i < 8; i++) {
ngx_rtmp_bit_read(br, 2); // reserved_zero_2bits[i]
}
}
for (i = 0; i < max_sub_layers_minus1; i++) {
if (sub_layer_profile_present_flag[i]) {
/*
* sub_layer_profile_space[i] u(2)
* sub_layer_tier_flag[i] u(1)
* sub_layer_profile_idc[i] u(5)
* sub_layer_profile_compatibility_flag[i][0..31] u(32)
* sub_layer_progressive_source_flag[i] u(1)
* sub_layer_interlaced_source_flag[i] u(1)
* sub_layer_non_packed_constraint_flag[i] u(1)
* sub_layer_frame_only_constraint_flag[i] u(1)
* sub_layer_reserved_zero_44bits[i] u(44)
*/
ngx_rtmp_bit_read(br, 32);
ngx_rtmp_bit_read(br, 32);
ngx_rtmp_bit_read(br, 24);
}
if (sub_layer_level_present_flag[i])
ngx_rtmp_bit_read(br, 8);
}
}
#undef MAX_SUB_LAYERS
#if (NGX_DEBUG)
static void
ngx_rtmp_codec_dump_header(ngx_rtmp_session_t *s, const char *type,
ngx_chain_t *in)
{
u_char buf[256], *p, *pp;
u_char hex[] = "0123456789abcdef";
for (pp = buf, p = in->buf->pos;
p < in->buf->last && pp < buf + sizeof(buf) - 1;
++p)
{
*pp++ = hex[*p >> 4];
*pp++ = hex[*p & 0x0f];
}
*pp = 0;
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: %s header %s", type, buf);
}
#endif
static ngx_int_t
ngx_rtmp_codec_construct_meta(ngx_rtmp_session_t *s)
{
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_core_srv_conf_t *cscf;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (ctx == NULL) {
return NGX_OK;
}
// meta was arrived, we do not construct it.
if (ctx->meta_came) {
return NGX_OK;
}
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"construct meta");
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
if (ctx->meta) {
ngx_rtmp_free_shared_chain(cscf, ctx->meta);
ctx->meta = NULL;
}
// meta was not arrived, we construct depend on what we have.
return ngx_rtmp_codec_reconstruct_meta(s);
}
static ngx_int_t
ngx_rtmp_codec_reconstruct_meta(ngx_rtmp_session_t *s)
{
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_core_srv_conf_t *cscf;
ngx_int_t rc;
static struct {
double width;
double height;
double duration;
double frame_rate;
double video_data_rate;
double video_codec_id;
double audio_data_rate;
double audio_codec_id;
u_char profile[32];
u_char level[32];
} v;
static ngx_rtmp_amf_elt_t out_inf[] = {
{ NGX_RTMP_AMF_STRING,
ngx_string("Server"),
"NGINX RTMP (github.com/gnolizuh/BLSS)", 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("width"),
&v.width, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("height"),
&v.height, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("displayWidth"),
&v.width, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("displayHeight"),
&v.height, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("duration"),
&v.duration, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("framerate"),
&v.frame_rate, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("fps"),
&v.frame_rate, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("videodatarate"),
&v.video_data_rate, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("videocodecid"),
&v.video_codec_id, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("audiodatarate"),
&v.audio_data_rate, 0 },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("audiocodecid"),
&v.audio_codec_id, 0 },
{ NGX_RTMP_AMF_STRING,
ngx_string("profile"),
&v.profile, sizeof(v.profile) },
{ NGX_RTMP_AMF_STRING,
ngx_string("level"),
&v.level, sizeof(v.level) },
};
static ngx_rtmp_amf_elt_t out_elts[] = {
{ NGX_RTMP_AMF_STRING,
ngx_null_string,
"onMetaData", 0 },
{ NGX_RTMP_AMF_OBJECT,
ngx_null_string,
out_inf, sizeof(out_inf) },
};
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (ctx == NULL) {
return NGX_OK;
}
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
if (ctx->meta) {
ngx_rtmp_free_shared_chain(cscf, ctx->meta);
ctx->meta = NULL;
}
v.width = ctx->width;
v.height = ctx->height;
v.duration = ctx->duration;
v.frame_rate = ctx->frame_rate;
v.video_data_rate = ctx->video_data_rate;
v.video_codec_id = ctx->video_codec_id;
v.audio_data_rate = ctx->audio_data_rate;
v.audio_codec_id = ctx->audio_codec_id;
ngx_memcpy(v.profile, ctx->profile, sizeof(ctx->profile));
ngx_memcpy(v.level, ctx->level, sizeof(ctx->level));
rc = ngx_rtmp_append_amf(s, &ctx->meta, NULL, out_elts,
sizeof(out_elts) / sizeof(out_elts[0]));
if (rc != NGX_OK || ctx->meta == NULL) {
return NGX_ERROR;
}
return ngx_rtmp_codec_prepare_meta(s, 0);
}
static ngx_int_t
ngx_rtmp_codec_copy_meta(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_chain_t *in)
{
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_core_srv_conf_t *cscf;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
if (ctx->meta) {
ngx_rtmp_free_shared_chain(cscf, ctx->meta);
}
ctx->meta = ngx_rtmp_append_shared_bufs(cscf, NULL, in);
if (ctx->meta == NULL) {
return NGX_ERROR;
}
return ngx_rtmp_codec_prepare_meta(s, h->timestamp);
}
static ngx_int_t
ngx_rtmp_codec_prepare_meta(ngx_rtmp_session_t *s, uint32_t timestamp)
{
ngx_rtmp_header_t h;
ngx_rtmp_codec_ctx_t *ctx;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
ngx_memzero(&h, sizeof(h));
h.csid = NGX_RTMP_CSID_AMF;
h.msid = NGX_RTMP_MSID;
h.type = NGX_RTMP_MSG_AMF_META;
h.timestamp = timestamp;