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ngx_rtmp_codec_module.c
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/*
* Copyright (C) Roman Arutyunyan
*/
#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"
#define NGX_RTMP_CODEC_META_OFF 0
#define NGX_RTMP_CODEC_META_ON 1
#define NGX_RTMP_CODEC_META_COPY 2
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_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);
#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_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 */
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",
"",
"",
"",
"",
"H265",
};
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->avc_header) {
ngx_rtmp_free_shared_chain(cscf, ctx->avc_header);
ctx->avc_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);
}
/* 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) {
// parse AudioTagHeader
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 {
// parse VideoTagHeader avc=7 hevc=12
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;
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 {
if (ctx->video_codec_id == NGX_RTMP_VIDEO_H264) {
header = &ctx->avc_header;
ngx_rtmp_codec_parse_avc_header(s, in);
}
if (ctx->video_codec_id == NGX_RTMP_VIDEO_H265) {
header = &ctx->avc_header;
ngx_rtmp_codec_parse_hevc_header(s, in);
}
}
if (header == NULL) {
return NGX_OK;
}
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, cf_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->avc_profile = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
ctx->avc_compat = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
ctx->avc_level = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
/* nal bytes */
ctx->avc_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 */
cf_idc = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
if (cf_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 < (cf_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 alwys 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->avc_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->avc_profile, ctx->avc_compat, ctx->avc_level,
ctx->avc_nal_bytes, ctx->avc_ref_frames,
ctx->width, ctx->height);
}
//add by adwpc for hevc
static void
ngx_rtmp_codec_parse_hevc_header(ngx_rtmp_session_t *s, ngx_chain_t *in)
{
ngx_uint_t i, j, narrs, nal_type, nnal, nnall;
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_bit_reader_t br;
#if (NGX_DEBUG)
ngx_rtmp_hex_dump(s->connection->log, "ngx_rtmp_codec_parse_hevc_header", in->buf->start, in->buf->end);
ngx_rtmp_codec_dump_header(s, "ngx_rtmp_codec_parse_hevc_header in:", in);
#endif
// HEVCDecoderConfigurationRecord
// http://ffmpeg.org/doxygen/trunk/hevc_8c_source.html#l00040
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
ngx_rtmp_bit_init_reader(&br, in->buf->pos, in->buf->last);
//skip tag header and configurationVersion(1 byte)
ngx_rtmp_bit_read(&br, 48);
/* unsigned int(2) general_profile_space; */
/* unsigned int(1) general_tier_flag; */
/* unsigned int(5) general_profile_idc; */
ctx->avc_profile = (ngx_uint_t) ((ngx_rtmp_bit_read_8(&br) & 0x1f) >> 5);
//unsigned int(32) general_profile_compatibility_flags;
ctx->avc_compat = (ngx_uint_t) ngx_rtmp_bit_read_32(&br);
//unsigned int(48) general_constraint_indicator_flags;
ngx_rtmp_bit_read(&br, 48);
//unsigned int(8) general_level_idc;
ctx->avc_level = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
/* 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; */
ngx_rtmp_bit_read(&br, 48);
/* bit(16) avgFrameRate; */
ctx->frame_rate = (ngx_uint_t) ngx_rtmp_bit_read_16(&br);
/* bit(2) constantFrameRate; */
ctx->avc_ref_frames = (ngx_uint_t) ngx_rtmp_bit_read(&br, 2);
/* bit(3) numTemporalLayers; */
/* bit(1) temporalIdNested; */
ngx_rtmp_bit_read(&br, 4);
/* unsigned int(2) lengthSizeMinusOne; */
ctx->avc_nal_bytes = (ngx_uint_t)ngx_rtmp_bit_read(&br, 2) + 1;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0, "codec: hevc h265 ctx->avc_nal_bytes=%ui", ctx->avc_nal_bytes);
/* unsigned int(8) numOfArrays; 04 */
narrs = (ngx_uint_t)ngx_rtmp_bit_read_8(&br);
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0, "codec: hevc header narrs=%ui ", narrs);
//parse vps sps pps ..
for ( j = 0; j < narrs; j++) {
//bit(1) array_completeness;
nal_type = (ngx_uint_t)ngx_rtmp_bit_read_8(&br) & 0x3f;
nnal = (ngx_uint_t)ngx_rtmp_bit_read_16(&br);
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->connection->log, 0, "codec: hevc nal_type=%ui nnal=%ui", nal_type, nnal);
for (i = 0; i < nnal; i++) {
nnall = (ngx_uint_t)ngx_rtmp_bit_read_16(&br);
ngx_rtmp_bit_read(&br, nnall*8);
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0, "codec: hevc nnall=%ui", nnall);
//vps-32 sps-33 pps-34
}
}
/* todo ctx->avc_ref_frames = and so on*/
ngx_log_debug8(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: hevc header "
"profile=%ui, compat=%ui, level=%ui, "
"nal_bytes=%ui, ref_frames=%ui, frame_rate=%ui, width=%ui, height=%ui",
ctx->avc_profile, ctx->avc_compat, ctx->avc_level,
ctx->avc_nal_bytes, ctx->avc_ref_frames, ctx->frame_rate,
ctx->width, ctx->height);
}
#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_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/arut/nginx-rtmp-module)", 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;
ngx_rtmp_prepare_message(s, &h, NULL, ctx->meta);
ctx->meta_version = ngx_rtmp_codec_get_next_version();
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_codec_meta_data(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_chain_t *in)
{
ngx_rtmp_codec_app_conf_t *cacf;
ngx_rtmp_codec_ctx_t *ctx;
ngx_uint_t skip;
static struct {
double width;
double height;
double duration;
double frame_rate;
double video_data_rate;
double video_codec_id_n;
u_char video_codec_id_s[32];
double audio_data_rate;
double audio_codec_id_n;
u_char audio_codec_id_s[32];
u_char profile[32];
u_char level[32];
} v;
static ngx_rtmp_amf_elt_t in_video_codec_id[] = {
{ NGX_RTMP_AMF_NUMBER,
ngx_null_string,
&v.video_codec_id_n, 0 },
{ NGX_RTMP_AMF_STRING,
ngx_null_string,
&v.video_codec_id_s, sizeof(v.video_codec_id_s) },
};
static ngx_rtmp_amf_elt_t in_audio_codec_id[] = {
{ NGX_RTMP_AMF_NUMBER,
ngx_null_string,
&v.audio_codec_id_n, 0 },
{ NGX_RTMP_AMF_STRING,
ngx_null_string,
&v.audio_codec_id_s, sizeof(v.audio_codec_id_s) },
};
static ngx_rtmp_amf_elt_t in_inf[] = {
{ 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("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_VARIANT,
ngx_string("videocodecid"),
in_video_codec_id, sizeof(in_video_codec_id) },
{ NGX_RTMP_AMF_NUMBER,
ngx_string("audiodatarate"),
&v.audio_data_rate, 0 },
{ NGX_RTMP_AMF_VARIANT,
ngx_string("audiocodecid"),
in_audio_codec_id, sizeof(in_audio_codec_id) },
{ 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 in_elts[] = {
{ NGX_RTMP_AMF_STRING,
ngx_null_string,
NULL, 0 },
{ NGX_RTMP_AMF_OBJECT,
ngx_null_string,
in_inf, sizeof(in_inf) },
};
cacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_codec_module);
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);
}
ngx_memzero(&v, sizeof(v));
/* use -1 as a sign of unchanged data;
* 0 is a valid value for uncompressed audio */
v.audio_codec_id_n = -1;
/* FFmpeg sends a string in front of actal metadata; ignore it */
skip = !(in->buf->last > in->buf->pos
&& *in->buf->pos == NGX_RTMP_AMF_STRING);
if (ngx_rtmp_receive_amf(s, in, in_elts + skip,
sizeof(in_elts) / sizeof(in_elts[0]) - skip))
{
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"codec: error parsing data frame");
return NGX_OK;
}
ctx->width = (ngx_uint_t) v.width;
ctx->height = (ngx_uint_t) v.height;
ctx->duration = (ngx_uint_t) v.duration;
ctx->frame_rate = (ngx_uint_t) v.frame_rate;
ctx->video_data_rate = (ngx_uint_t) v.video_data_rate;
ctx->video_codec_id = (ngx_uint_t) v.video_codec_id_n;
ctx->audio_data_rate = (ngx_uint_t) v.audio_data_rate;
ctx->audio_codec_id = (v.audio_codec_id_n == -1
? 0 : v.audio_codec_id_n == 0
? NGX_RTMP_AUDIO_UNCOMPRESSED : (ngx_uint_t) v.audio_codec_id_n);
ngx_memcpy(ctx->profile, v.profile, sizeof(v.profile));
ngx_memcpy(ctx->level, v.level, sizeof(v.level));
ngx_log_debug8(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: data frame: "
"width=%ui height=%ui duration=%ui frame_rate=%ui "
"video=%s (%ui) audio=%s (%ui)",
ctx->width, ctx->height, ctx->duration, ctx->frame_rate,
ngx_rtmp_get_video_codec_name(ctx->video_codec_id),
ctx->video_codec_id,
ngx_rtmp_get_audio_codec_name(ctx->audio_codec_id),
ctx->audio_codec_id);
switch (cacf->meta) {
case NGX_RTMP_CODEC_META_ON:
return ngx_rtmp_codec_reconstruct_meta(s);
case NGX_RTMP_CODEC_META_COPY:
return ngx_rtmp_codec_copy_meta(s, h, in);
}
/* NGX_RTMP_CODEC_META_OFF */
return NGX_OK;
}
static void *
ngx_rtmp_codec_create_app_conf(ngx_conf_t *cf)