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ngx_rtmp_codec_module.c
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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"
#include "ngx_rbuf.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",
};
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;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (ctx == NULL) {
return NGX_OK;
}
if (ctx->avc_header) {
ngx_rtmp_shared_free_frame(ctx->avc_header);
ctx->avc_header = NULL;
}
if (ctx->aac_header) {
ngx_rtmp_shared_free_frame(ctx->aac_header);
ctx->aac_header = NULL;
}
if (ctx->meta) {
ngx_rtmp_shared_free_frame(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_core_app_conf_t *cacf;
ngx_rtmp_codec_ctx_t *ctx;
ngx_rtmp_frame_t **header;
uint8_t fmt;
u_char frametype;
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;
}
if (h->type == NGX_RTMP_MSG_VIDEO) {
frametype = in->buf->pos[0] & 0xf0;
if (frametype != 0x10 && frametype != 0x20) {
ngx_log_error(NGX_LOG_ERR, s->log, 0,
"codec: receive unkwnon frametype %02xD", frametype);
return NGX_OK;
}
}
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (ctx == NULL) {
ctx = ngx_pcalloc(s->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) {
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];
}
s->acodec = ctx->audio_codec_id;
} else {
ctx->video_codec_id = (fmt & 0x0f);
s->vcodec = ctx->video_codec_id;
}
/* 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);
cacf = ngx_rtmp_get_module_app_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);
} else if (ctx->video_codec_id == cacf->hevc_codec) {
header = &ctx->avc_header;
ngx_rtmp_codec_parse_hevc_header(s, in);
}
}
if (header == NULL) {
return NGX_OK;
}
if (*header) {
ngx_rtmp_shared_free_frame(*header);
}
*header = ngx_rtmp_shared_alloc_frame(cscf->chunk_size, in, 0);
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->log, 0,
"codec: aac header profile=%ui, "
"sample_rate=%ui, chan_conf=%ui",
ctx->aac_profile, ctx->sample_rate, ctx->aac_chan_conf);
}
/*
* ITU-T H.265 7.3.1 General NAL unit syntax
*/
static ngx_int_t
ngx_rtmp_codec_parse_hevc_nal_to_rbsp(ngx_rtmp_session_t *s, u_char *p,
ngx_rtmp_bit_reader_t *br, ngx_uint_t nal_unit_type,
ngx_uint_t nal_unit_len)
{
ngx_uint_t i, count, rbsp_bytes;
/*
* nal_unit
* nal_unit_header()
* NumBytesInRbsp = 0
* for (i = 2; i < NumBytesInNalUnit; i++)
* if (i + 2 < NumBytesInNalUnit && next_bits(24) == 0x000003) {
* rbsp_byte[NumBytesInRbsp++]
* rbsp_byte[NumBytesInRbsp++]
* i += 2
* emulation_prevention_three_byte // equal to 0x03
* } else
* rbsp_byte[NumBytesInRbsp++]
*
* nal_unit_header
* forbidden_zero_bit 1 bit
* nal_unit_type 6 bits
* nuh_layer_id 6 bits
* nuh_temporal_id_plus1 3 bits
*
* ITU-T H.265 7.4.2.1
* emulation_prevention_three_byte is a byte equal to 0x03.
* When an emulation_prevention_three_byte is present in the NAL unit,
* it shall be discarded by the decoding process
* Within the NAL unit, the following three-byte sequences shall not
* occur at any byte-aligned position:
* 0x000000
* 0x000001
* 0x000002
* Within the NAL unit, any four-byte sequence that starts with
* 0x000003 other than the following sequences shall not occur at
* any byte-aligned position:
* 0x00000300
* 0x00000301
* 0x00000302
* 0x00000303
*/
ngx_rtmp_bit_read(br, 1);
if (ngx_rtmp_bit_read(br, 6) != nal_unit_type) {
ngx_log_error(NGX_LOG_ERR, s->log, 0,
"nal_unit_type not expect %ui", nal_unit_type);
return NGX_ERROR;
}
ngx_rtmp_bit_read(br, 6);
ngx_rtmp_bit_read(br, 3);
count = 0;
rbsp_bytes = 0;
for (i = 0; i < nal_unit_len; ++i) {
if (count == 2) { /* already 0x0000 */
if (br->pos[i] < 0x03) {
ngx_log_error(NGX_LOG_ERR, s->log, 0,
"three bytes sequence error");
return NGX_ERROR;
}
if (br->pos[i] == 0x03 && br->pos[i + 1] > 0x03) {
ngx_log_error(NGX_LOG_ERR, s->log, 0,
"four bytes sequence error");
return NGX_ERROR;
}
if (br->pos[i] == 0x03) {
count = 0;
continue;
}
}
*p++ = br->pos[i];
++rbsp_bytes;
if (br->pos[i] == 0x00) {
++count;
} else {
count = 0;
}
}
return rbsp_bytes;
}
/*
* ITU-T H.265 7.3.3 Profile, tier and level syntax
*/
static void
ngx_rtmp_codec_parse_hevc_ptl(ngx_rtmp_session_t *s, ngx_rtmp_bit_reader_t *br,
ngx_flag_t profilePresentFlag, ngx_uint_t maxNumSubLayersMinus1)
{
ngx_uint_t i, slppf[8], sllpf[8];
if (profilePresentFlag) {
/*
* profile_tier_level
* general_profile_space 2 bits
* general_tier_flag 1 bit
* general_profile_idc 5 bits
* for (j = 0; j < 32; j++)
* general_profile_compatibility_flag[j] 1 bit
* general_progressive_source_flag 1 bit
* general_interlaced_source_flag 1 bit
* general_non_packed_constraint_flag 1 bit
* general_frame_only_constraint_flag 1 bit
*
* general_max_12bit_constraint_flag 1 bit
* general_max_10bit_constraint_flag 1 bit
* general_max_8bit_constraint_flag 1 bit
* general_max_422chroma_constraint_flag 1 bit
* general_max_420chroma_constraint_flag 1 bit
* general_max_monochrome_constraint_flag 1 bit
* general_intra_constraint_flag 1 bit
* general_one_picture_only_constraint_flag 1 bit
* general_lower_bit_rate_constraint_flag 1 bit
* general_reserved_zero_34bits 34 bits
*
* general_inbld_flag 1 bit
*/
ngx_rtmp_bit_read(br, 88);
}
/*
* profile_tier_level
* general_level_idc 8 bits
*/
ngx_rtmp_bit_read(br, 8);
/*
* profile_tier_level
* for(i = 0; i < maxNumSubLayersMinus1; i++) {
* sub_layer_profile_present_flag[i] 1 bit
* sub_layer_level_present_flag[i] 1 bit
* }
*
* if (maxNumSubLayersMinus1 > 0)
* for(i = maxNumSubLayersMinus1; i < 8; i++)
* reserved_zero_2bits[i] 2 bits
*/
for (i = 0; i < maxNumSubLayersMinus1; ++i) {
slppf[i] = ngx_rtmp_bit_read(br, 1);
sllpf[i] = ngx_rtmp_bit_read(br, 1);
ngx_log_error(NGX_LOG_ERR, s->log, 0,
"%d sub_layer_profile_present_flag:%d, "
"sub_layer_level_present_flag:%d", i, slppf[i], sllpf[i]);
}
if (maxNumSubLayersMinus1 > 0) {
for (i = maxNumSubLayersMinus1; i < 8; ++i) {
ngx_uint_t t = ngx_rtmp_bit_read(br, 2);
ngx_log_error(NGX_LOG_ERR, s->log, 0, "zero bit %d", t);
}
}
/*
* profile_tier_level
* for (i = 0; i < maxNumSubLayersMinus1; i++) {
* if (sub_layer_profile_present_flag[i] {
* 44 bits
* }
* if (sub_layer_level_present_flag[i]) {
* sub_layer_level_idc[i] 8 bits
* }
* }
*/
for (i = 0; i < maxNumSubLayersMinus1; ++i) {
if (slppf[i]) {
ngx_rtmp_bit_read(br, 88);
}
if (sllpf[i]) {
ngx_rtmp_bit_read(br, 8);
}
}
}
/*
* ITU-T H.265 7.3.2.2 Sequence parameter set RBSP syntax
*/
static void
ngx_rtmp_codec_parse_hevc_sps(ngx_rtmp_session_t *s, ngx_rtmp_codec_ctx_t *ctx,
ngx_rtmp_bit_reader_t *pbr, ngx_uint_t nal_unit_len)
{
ngx_uint_t mslm, psi, cfi, width, height,
subwidthC, subheightC,
cwlo, cwro, cwto, cwbo;
ngx_rtmp_bit_reader_t br;
u_char buf[4096];
ngx_int_t rbsp_bytes;
ngx_rtmp_bit_init_reader(&br, pbr->pos, pbr->pos + nal_unit_len);
rbsp_bytes = ngx_rtmp_codec_parse_hevc_nal_to_rbsp(s, buf, &br, NAL_SPS,
nal_unit_len);
if (rbsp_bytes == NGX_ERROR) {
return;
}
ngx_rtmp_bit_init_reader(&br, buf, buf + rbsp_bytes);
/*
* seq_parameter_set_rbsp
* sps_video_parameter_set_id 4 bits
* sps_max_sub_layers_minus1 3 bits
* sps_temporal_id_nesting_flag 1 bit
*/
ngx_rtmp_bit_read(&br, 4);
mslm = ngx_rtmp_bit_read(&br, 3);
ngx_rtmp_bit_read(&br, 1);
/*
* seq_parameter_set_rbsp
* profile_tier_level(1, sps_max_sub_layers_minus1)
*/
ngx_rtmp_codec_parse_hevc_ptl(s, &br, 1, mslm);
/* calc resolution */
/*
* seq_parameter_set_rbsp
* sps_seq_parameter_set_id v
* chroma_format_idc v
* if (chroma_format_idc == 3)
* separate_colour_plane_flag 1 bit
* pic_width_in_luma_samples v
* pic_height_in_luma_samples v
* conformance_window_flag 1 bit
* if (conformance_window_flag) {
* conf_win_left_offset v
* conf_win_right_offset v
* conf_win_top_offset v
* conf_win_bottom_offset v
* }
*/
psi = ngx_rtmp_bit_read_golomb(&br);
if (psi > 16 || br.err) {
ngx_log_error(NGX_LOG_ERR, s->log, 0,
"read sps_seq_parameter_set_id error: %ui", psi);
return;
}
cfi = ngx_rtmp_bit_read_golomb(&br);
if (cfi > 3 || br.err) {
ngx_log_error(NGX_LOG_ERR, s->log, 0,
"read chroma_format_idc error: %ui", cfi);
return;
}
if (cfi == 3) {
ngx_rtmp_bit_read(&br, 1);
}
width = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
if (br.err) {
ngx_log_error(NGX_LOG_ERR, s->log, 0, "read width error");
return;
}
height = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
if (br.err) {
ngx_log_error(NGX_LOG_ERR, s->log, 0, "read height error");
return;
}
if (ngx_rtmp_bit_read(&br, 1)) {
cwlo = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
cwro = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
cwto = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
cwbo = (ngx_uint_t) ngx_rtmp_bit_read_golomb(&br);
/*
* ITU-T H.265 Table 6-1
*/
if (cfi == 1) { /* 4:2:0 */
subwidthC = 2;
subheightC = 2;
} else if (cfi == 2) { /* 4:2:2 */
subwidthC = 2;
subheightC = 1;
} else { /* Monochrome or 4:4:4 */
subwidthC = 1;
subheightC = 1;
}
/*
* ITU-T H.265 7.4.3.2.1
*
* horizontal picture coordinates from
* SubWidthC * conf_win_left_offset to
* pic_width_in_luma_samples - (SubWidthC * conf_win_right_offset + 1)
* vertical picture coordinates from
* SubHeightC * conf_win_top_offset to
* pic_height_in_luma_samples -
* (SubHeightC * conf_win_bottom_offset + 1)
*/
ctx->width = width - (subwidthC * cwro + 1) - (subwidthC * cwlo);
ctx->height = height - (subheightC * cwbo + 1) - (subheightC * cwto);
} else {
ctx->width = width;
ctx->height = height;
}
return;
}
static void
ngx_rtmp_codec_parse_hevc_header(ngx_rtmp_session_t *s, ngx_chain_t *in)
{
ngx_uint_t i, j, num_arrays, nal_unit_type, num_nalus,
nal_unit_len;
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);
/*
* FrameType 4 bits
* CodecID 4 bits
* AVCPacketType 1 byte
* CompositionTime 3 bytes
* HEVCDecoderConfigurationRecord
* configurationVersion 1 byte
*/
ngx_rtmp_bit_read(&br, 48);
/*
* HEVCDecoderConfigurationRecord
* general_profile_space 2 bits
* general_tier_flag 1 bit
* general_profile_idc 5 bits
* general_profile_compatibility_flags 4 bytes
* general_constraint_indicator_flags 6 bytes
* general_level_idc 1 byte
* min_spatial_segmentation_idc 4 bits reserved + 12 bits
* parallelismType 6 bits reserved + 2 bits
* chroma_format_idc 6 bits reserved + 2 bits
* bit_depth_luma_minus8 5 bits reserved + 3 bits
* bit_depth_chroma_minus8 5 bits reserved + 3 bits
* avgFrameRate 2 bytes
*/
ngx_rtmp_bit_read(&br, 160);
/*
* HEVCDecoderConfigurationRecord
* constantFrameRate 2 bits
* numTemporalLayers 3 bits
* temporalIdNested 1 bit
* lengthSizeMinusOne 2 bits
*/
ctx->avc_nal_bytes = (ngx_uint_t) ((ngx_rtmp_bit_read_8(&br) & 0x03) + 1);
/*
* HEVCDecoderConfigurationRecord
* numOfArrays 1 byte
*/
num_arrays = (ngx_uint_t) ngx_rtmp_bit_read_8(&br);
for (i = 0; i < num_arrays; ++i) {
/*
* array_completeness 1 bit
* reserved 1 bit
* NAL_unit_type 6 bits
* numNalus 2 bytes
*/
nal_unit_type = (ngx_uint_t) (ngx_rtmp_bit_read_8(&br) & 0x3f);
num_nalus = (ngx_uint_t) ngx_rtmp_bit_read_16(&br);
for (j = 0; j < num_nalus; ++j) {
/*
* nalUnitLength 2 bytes
*/
nal_unit_len = (ngx_uint_t) ngx_rtmp_bit_read_16(&br);
switch (nal_unit_type) {
case NAL_SPS:
ngx_rtmp_codec_parse_hevc_sps(s, ctx, &br, nal_unit_len);
ngx_rtmp_bit_read(&br, nal_unit_len * 8);
break;
default:
ngx_rtmp_bit_read(&br, nal_unit_len * 8);
break;
}
}
}
ngx_log_debug7(NGX_LOG_DEBUG_RTMP, s->log, 0,
"codec: hevc 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);
}
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->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->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;