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ngx_rtmp_codec_module.c
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/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Winshining
*/
#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"
#include "ngx_http_flv_live_module.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);
#if (NGX_DEBUG)
static void ngx_rtmp_codec_dump_header(ngx_rtmp_session_t *s, const char *type,
ngx_chain_t *in);
#endif
static void ngx_rtmp_codec_parse_avc_header_compat(ngx_rtmp_session_t *s,
ngx_chain_t **in, ngx_chain_t *sps);
static ngx_int_t ngx_rtmp_codec_parse_avc_header_in_keyframe(
ngx_rtmp_session_t *s, ngx_chain_t *in, ngx_buf_t *out);
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",
};
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;
}
#define NGX_RTMP_CODEC_NON_SEQ_HEADER 0
#define NGX_RTMP_CODEC_SINGLE_SEQ_HEADER 1
#define NGX_RTMP_CODEC_COMBO_SEQ_HEADER 2
static ngx_inline ngx_int_t
ngx_rtmp_codec_video_is_combined_nals(ngx_chain_t *in, ngx_rtmp_session_t *s)
{
ngx_rtmp_codec_ctx_t *ctx;
uint8_t src_nal_type, nal_type;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (ctx == NULL || ctx->avc_nal_bytes == 0) {
return NGX_ERROR;
}
if (ngx_rtmp_get_video_frame_type(in) != NGX_RTMP_VIDEO_KEY_FRAME) {
return NGX_ERROR;
}
/**
* +--------------------------------------------+---------------+
* | 17 | 00 | 00 | 00 | 00 |0|1|2|3|4|5|6|7|
* +--------------------------------------------+-+-+-+-+-+-+-+-+
* |frt|cdid|pkt-type| composition time |F|NRI| Type |
* +------------------------------------------------------------+
**/
if (in->buf->pos + 5 + ctx->avc_nal_bytes <= in->buf->last) {
src_nal_type = in->buf->pos[5 + ctx->avc_nal_bytes];
if (ctx->video_codec_id == NGX_RTMP_VIDEO_H264) {
nal_type = src_nal_type & 0x1f;
return (nal_type >= NGX_RTMP_NALU_SPS
&& nal_type <= NGX_RTMP_NALU_PPS) ? NGX_OK : NGX_ERROR;
}
}
return NGX_ERROR;
}
static ngx_inline ngx_int_t
ngx_rtmp_get_codec_header_type(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_chain_t *in)
{
if (ngx_rtmp_is_codec_header(in)) {
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: a sequence header in chain");
return NGX_RTMP_CODEC_SINGLE_SEQ_HEADER;
}
if (h->type == NGX_RTMP_MSG_VIDEO &&
ngx_rtmp_codec_video_is_combined_nals(in, s) == NGX_OK)
{
ngx_log_debug0(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: an AVC NALU or an AAC raw packet in chain");
return NGX_RTMP_CODEC_COMBO_SEQ_HEADER;
}
return NGX_RTMP_CODEC_NON_SEQ_HEADER;
}
ngx_int_t
ngx_rtmp_codec_parse_avc_header_in_keyframe(ngx_rtmp_session_t *s,
ngx_chain_t *in, ngx_buf_t *out)
{
ngx_rtmp_codec_ctx_t *ctx;
u_char *p;
uint8_t fmt, ftype, htype, src_nal_type, nal_type;
uint32_t rlen, len;
ngx_buf_t *b;
ngx_uint_t nal_bytes;
ngx_uint_t has_sps = 0;
ngx_uint_t left;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (ctx == NULL
|| ctx->video_codec_id != NGX_RTMP_VIDEO_H264
|| ctx->avc_nal_bytes == 0
|| out == NULL)
{
return NGX_ERROR;
}
#if (NGX_DEBUG)
ngx_rtmp_codec_dump_header(s, "avc_in_keyframe", in);
#endif
p = in->buf->pos;
if (ngx_rtmp_hls_copy(s, &fmt, &p, 1, &in) != NGX_OK) {
return NGX_ERROR;
}
/* 1: keyframe (IDR)
* 2: inter frame
* 3: disposable inter frame */
ftype = (fmt & 0xf0) >> 4;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: ftype='%uD'", ftype);
if (ftype != NGX_RTMP_FRAME_IDR) {
return NGX_ERROR;
}
/* H.264 HDR/PICT */
if (ngx_rtmp_hls_copy(s, &htype, &p, 1, &in) != NGX_OK) {
return NGX_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: htype='%uD'", htype);
/* proceed only with PICT */
if (htype != 1) {
return NGX_OK;
}
b = out;
*b->last++ = ((ftype & 0x0f) << 4) | NGX_RTMP_NALU_SPS;
*b->last++ = 0x00;
/* 3 bytes: decoder delay */
if (ngx_rtmp_hls_copy(s, NULL, &p, 3, &in) != NGX_OK) {
return NGX_ERROR;
}
/* 3 bytes: composition time */
*b->last++ = 0x00;
*b->last++ = 0x00;
*b->last++ = 0x00;
/* 1 byte: configuration version */
*b->last++ = 0x01;
/* 1 byte: avc profile indication */
*b->last++ = ctx->avc_profile;
/* 1 byte: profile compatibility */
*b->last++ = ctx->avc_compat;
/* 1 byte: avc level indication */
*b->last++ = ctx->avc_level;
/* 1 byte: reserved 6 bits + lengthSizeMinusOne 2 bits */
*b->last++ = 0xff;
/* num of SPS */
*b->last++ = 0xe1;
/* H.264 nal -> len + body */
/* body: nal_type(1) + */
nal_bytes = ctx->avc_nal_bytes;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: nal_bytes='%uD'", nal_bytes);
left = NGX_RTMP_SPS_MAX_LENGTH;
while (in) {
if (ngx_rtmp_hls_copy(s, &rlen, &p, nal_bytes, &in) != NGX_OK) {
return NGX_OK;
}
len = 0;
ngx_rtmp_rmemcpy(&len, &rlen, nal_bytes);
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: len='%uD'", len);
if (len == 0) {
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: skip, len='%uD'", len);
continue;
}
if (ngx_rtmp_hls_copy(s, &src_nal_type, &p, 1, &in) != NGX_OK) {
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: src_nal_type='%uD'", src_nal_type);
/**
* +---------------+
* |0|1|2|3|4|5|6|7|
* +-+-+-+-+-+-+-+-+
* |F|NRI| Type |
* +---------------+
**/
nal_type = src_nal_type & 0x1f;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: nal_type='%uD'", nal_type);
if (!(nal_type >= NGX_RTMP_NALU_SPS
&& nal_type <= NGX_RTMP_NALU_PPS))
{
if (ngx_rtmp_hls_copy(s, NULL, &p, len - 1, &in) != NGX_OK) {
return NGX_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: skip non-sps or non-pps, nal_type='%uD'", nal_type);
continue;
}
left = NGX_RTMP_SPS_MAX_LENGTH - (b->last - b->pos);
/* avc: nal len(2B) + nal data (len Byte) + pps num(1B) */
if (len + 3 > left) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"codec: avc too big sps or pps, "
"nal_type: %uD, left=%uD, len=%uD",
nal_type, left, len);
return NGX_ERROR;
}
/* nal length */
*b->last++ = len >> 8;
*b->last++ = len & 0xff;
*b->last++ = src_nal_type;
if (ngx_rtmp_hls_copy(s, b->last, &p, len - 1, &in) != NGX_OK) {
return NGX_ERROR;
}
b->last += len - 1;
/* NALs MUST be SPS + PPS */
*b->last++ = 0x01;
has_sps = 1;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: has_sps='%uD'", has_sps);
}
return (has_sps == 1) ? NGX_OK : NGX_ERROR;
}
void
ngx_rtmp_codec_parse_avc_header_compat(ngx_rtmp_session_t *s,
ngx_chain_t **in, ngx_chain_t *sps)
{
if (in == NULL || *in == NULL || sps == NULL) {
return;
}
if (ngx_rtmp_codec_parse_avc_header_in_keyframe(s, *in,
sps->buf) != NGX_OK)
{
return;
}
*in = sps;
ngx_rtmp_codec_parse_avc_header(s, *in);
}
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;
ngx_buf_t sps_buf;
u_char buffer[NGX_RTMP_SPS_MAX_LENGTH];
ngx_chain_t sps;
ngx_uint_t seq_header_type;
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;
}
cscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);
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;
}
/* PacketType = 0, FLV TAG MUST be sequence header */
/* PacketType = 1, FLV TAG MAY be AVC NALU or AAC Raw */
seq_header_type = ngx_rtmp_get_codec_header_type(s, h, in);
if (seq_header_type == NGX_RTMP_CODEC_NON_SEQ_HEADER) {
return NGX_OK;
}
header = NULL;
sps_buf.start = buffer;
sps_buf.end = buffer + sizeof(buffer);
sps_buf.pos = sps_buf.start;
sps_buf.last = sps_buf.pos;
sps.buf = &sps_buf;
sps.next = 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 {
if (ctx->video_codec_id == NGX_RTMP_VIDEO_H264) {
header = &ctx->avc_header;
if (seq_header_type == NGX_RTMP_CODEC_COMBO_SEQ_HEADER) {
ngx_rtmp_codec_parse_avc_header_compat(s, &in, &sps);
} else {
ngx_rtmp_codec_parse_avc_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;
}
#undef NGX_RTMP_CODEC_NON_SEQ_HEADER
#undef NGX_RTMP_CODEC_SINGLE_SEQ_HEADER
#undef NGX_RTMP_CODEC_COMBO_SEQ_HEADER
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);
}
#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 (https://github.com/winshining/nginx-http-flv-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);