mirror of
https://github.com/zotanmew/nginx-rtmp-module.git
synced 2024-05-17 09:01:08 +02:00
479 lines
13 KiB
C
479 lines
13 KiB
C
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/*
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* Copyright (C) Roman Arutyunyan
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include "ngx_rtmp_mpegts.h"
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#include "ngx_rtmp_codec_module.h"
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static u_char ngx_rtmp_mpegts_header[] = {
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/* https://en.wikipedia.org/wiki/MPEG_transport_stream#Packet */
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/* TS */
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0x47, // Sync byte
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0x40, 0x00, // TEI(1) + PUS(1) + TP(1) + PID(13)
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0x10, // SC(2) + AFF(1) + PF(1) + CC(4)
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0x00,
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/* PSI */
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0x00, 0xb0, 0x0d, 0x00, 0x01, 0xc1, 0x00, 0x00,
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/* PAT */
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0x00, 0x01, 0xef, 0xff,
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/* CRC */
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0x36, 0x90, 0xe2, 0x3d,
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/* stuffing 167 bytes */
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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/* TS */
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0x47,
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0x4f, 0xff,
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0x10,
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0x00,
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/* PSI */
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0x02, 0xb0, 0x17, 0x00, 0x01, 0xc1, 0x00, 0x00,
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/* PMT */
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0xe1, 0x00,
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0xf0, 0x00,
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0x1b, 0xe1, 0x00, 0xf0, 0x00, /* h264 */
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0x00, 0x00, 0x00, 0x00, 0x00, /* audio placeholder */
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0x00, 0x00, 0x00, 0x00, /* audio crc placeholder */
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/* stuffing 157 bytes */
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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};
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static u_char ngx_rtmp_mpegts_header_mp3[] = {
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0x03, 0xe1, 0x01, 0xf0, 0x00, /* mp3 */
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/* CRC */
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0x4e, 0x59, 0x3d, 0x1e, /* crc for mp3 */
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};
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static u_char ngx_rtmp_mpegts_header_aac[] = {
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0x0f, 0xe1, 0x01, 0xf0, 0x00, /* aac */
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/* CRC */
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0x2f, 0x44, 0xb9, 0x9b, /* crc for aac */
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};
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/* 700 ms PCR delay */
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#define NGX_RTMP_HLS_DELAY 63000
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static ngx_int_t
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ngx_rtmp_mpegts_write_file(ngx_rtmp_mpegts_file_t *file, u_char *in,
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size_t in_size)
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{
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u_char *out;
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size_t out_size, n;
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ssize_t rc;
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static u_char buf[1024];
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if (!file->encrypt) {
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ngx_log_debug1(NGX_LOG_DEBUG_CORE, file->log, 0,
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"mpegts: write %uz bytes", in_size);
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rc = ngx_write_fd(file->fd, in, in_size);
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if (rc < 0) {
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return NGX_ERROR;
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}
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return NGX_OK;
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}
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/* encrypt */
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ngx_log_debug1(NGX_LOG_DEBUG_CORE, file->log, 0,
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"mpegts: write %uz encrypted bytes", in_size);
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out = buf;
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out_size = sizeof(buf);
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if (file->size > 0 && file->size + in_size >= 16) {
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ngx_memcpy(file->buf + file->size, in, 16 - file->size);
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in += 16 - file->size;
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in_size -= 16 - file->size;
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AES_cbc_encrypt(file->buf, out, 16, &file->key, file->iv, AES_ENCRYPT);
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out += 16;
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out_size -= 16;
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file->size = 0;
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}
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for ( ;; ) {
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n = in_size & ~0x0f;
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if (n > 0) {
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if (n > out_size) {
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n = out_size;
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}
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AES_cbc_encrypt(in, out, n, &file->key, file->iv, AES_ENCRYPT);
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in += n;
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in_size -= n;
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} else if (out == buf) {
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break;
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}
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rc = ngx_write_fd(file->fd, buf, out - buf + n);
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if (rc < 0) {
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return NGX_ERROR;
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}
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out = buf;
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out_size = sizeof(buf);
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}
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if (in_size) {
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ngx_memcpy(file->buf + file->size, in, in_size);
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file->size += in_size;
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}
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return NGX_OK;
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}
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static ngx_int_t
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ngx_rtmp_mpegts_write_header(ngx_rtmp_mpegts_file_t *file, ngx_rtmp_codec_ctx_t *codec_ctx, ngx_uint_t mpegts_cc)
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{
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ngx_int_t rc;
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//If there's both audio and video present
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if (codec_ctx->audio_codec_id && codec_ctx->video_codec_id)
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{
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if (codec_ctx->audio_codec_id == NGX_RTMP_AUDIO_AAC) {
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ngx_memcpy(ngx_rtmp_mpegts_header+210, ngx_rtmp_mpegts_header_aac,
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sizeof(ngx_rtmp_mpegts_header_aac));
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}
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//if (*audio_codec_id == NGX_RTMP_AUDIO_MP3) {
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else {
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ngx_memcpy(ngx_rtmp_mpegts_header+210, ngx_rtmp_mpegts_header_mp3,
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sizeof(ngx_rtmp_mpegts_header_mp3));
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}
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// Truncate counter to 4 bits here
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mpegts_cc %= 0x0f;
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// And fill headers
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ngx_rtmp_mpegts_header[3] = (ngx_rtmp_mpegts_header[3] & 0xf0) + (u_char)mpegts_cc;
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ngx_rtmp_mpegts_header[191] = (ngx_rtmp_mpegts_header[191] & 0xf0) + (u_char)mpegts_cc;
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rc = ngx_rtmp_mpegts_write_file(file, ngx_rtmp_mpegts_header,
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sizeof(ngx_rtmp_mpegts_header));
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}
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else
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{
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//Just video or just audio
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u_char buf[sizeof(ngx_rtmp_mpegts_header)];
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ngx_memcpy(buf, ngx_rtmp_mpegts_header, sizeof(ngx_rtmp_mpegts_header));
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/* Fix the section length */
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buf[195] = 0x12;
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if (codec_ctx->audio_codec_id)
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{
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/* Set the PCR PID to the audio PID */
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buf[202] = 0x01;
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/* Move the audio description over the video description */
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ngx_memcpy(buf + 205, buf + 210, 5);
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/* Fix the CRC partially overwriting the audio description */
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buf[210] = 0xec;
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buf[211] = 0xe2;
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buf[212] = 0xb0;
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buf[213] = 0x94;
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}
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else
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{
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/* Fix the CRC partially overwriting the audio description */
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buf[210] = 0x15;
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buf[211] = 0xbd;
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buf[212] = 0x4d;
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buf[213] = 0x56;
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}
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/* Clear the last byte of the audio description and the old CRC */
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ngx_memset(buf + 214, 0xff, 5);
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rc = ngx_rtmp_mpegts_write_file(file, buf, sizeof(buf));
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}
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return rc;
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}
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static u_char *
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ngx_rtmp_mpegts_write_pcr(u_char *p, uint64_t pcr)
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{
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*p++ = (u_char) (pcr >> 25);
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*p++ = (u_char) (pcr >> 17);
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*p++ = (u_char) (pcr >> 9);
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*p++ = (u_char) (pcr >> 1);
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*p++ = (u_char) (pcr << 7 | 0x7e);
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*p++ = 0;
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return p;
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}
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static u_char *
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ngx_rtmp_mpegts_write_pts(u_char *p, ngx_uint_t fb, uint64_t pts)
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{
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ngx_uint_t val;
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val = fb << 4 | (((pts >> 30) & 0x07) << 1) | 1;
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*p++ = (u_char) val;
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val = (((pts >> 15) & 0x7fff) << 1) | 1;
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*p++ = (u_char) (val >> 8);
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*p++ = (u_char) val;
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val = (((pts) & 0x7fff) << 1) | 1;
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*p++ = (u_char) (val >> 8);
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*p++ = (u_char) val;
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return p;
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}
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ngx_int_t
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ngx_rtmp_mpegts_write_frame(ngx_rtmp_mpegts_file_t *file,
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ngx_rtmp_mpegts_frame_t *f, ngx_buf_t *b)
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{
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ngx_uint_t pes_size, header_size, body_size, in_size, stuff_size, flags;
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u_char packet[188], *p, *base;
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ngx_int_t first, rc;
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ngx_log_debug6(NGX_LOG_DEBUG_CORE, file->log, 0,
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"mpegts: pid=%ui, sid=%ui, pts=%uL, "
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"dts=%uL, key=%ui, size=%ui",
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f->pid, f->sid, f->pts, f->dts,
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(ngx_uint_t) f->key, (size_t) (b->last - b->pos));
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first = 1;
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while (b->pos < b->last) {
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p = packet;
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f->cc++;
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*p++ = 0x47;
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*p++ = (u_char) (f->pid >> 8);
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if (first) {
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p[-1] |= 0x40;
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}
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*p++ = (u_char) f->pid;
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*p++ = 0x10 | (f->cc & 0x0f); /* payload */
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if (first) {
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packet[3] |= 0x20; /* adaptation */
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*p++ = 7; /* size */
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*p++ = 0x50; /* random access + PCR */
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p = ngx_rtmp_mpegts_write_pcr(p, f->dts - NGX_RTMP_HLS_DELAY);
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/* PES header */
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*p++ = 0x00;
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*p++ = 0x00;
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*p++ = 0x01;
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*p++ = (u_char) f->sid;
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header_size = 5;
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flags = 0x80; /* PTS */
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if (f->dts != f->pts) {
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header_size += 5;
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flags |= 0x40; /* DTS */
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}
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pes_size = (b->last - b->pos) + header_size + 3;
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if (pes_size > 0xffff) {
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pes_size = 0;
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}
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*p++ = (u_char) (pes_size >> 8);
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*p++ = (u_char) pes_size;
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*p++ = 0x80; /* H222 */
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*p++ = (u_char) flags;
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*p++ = (u_char) header_size;
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p = ngx_rtmp_mpegts_write_pts(p, flags >> 6, f->pts +
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NGX_RTMP_HLS_DELAY);
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if (f->dts != f->pts) {
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p = ngx_rtmp_mpegts_write_pts(p, 1, f->dts +
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NGX_RTMP_HLS_DELAY);
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}
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first = 0;
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}
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body_size = (ngx_uint_t) (packet + sizeof(packet) - p);
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in_size = (ngx_uint_t) (b->last - b->pos);
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if (body_size <= in_size) {
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ngx_memcpy(p, b->pos, body_size);
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b->pos += body_size;
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} else {
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stuff_size = (body_size - in_size);
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if (packet[3] & 0x20) {
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/* has adaptation */
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base = &packet[5] + packet[4];
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p = ngx_movemem(base + stuff_size, base, p - base);
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ngx_memset(base, 0xff, stuff_size);
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packet[4] += (u_char) stuff_size;
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} else {
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/* no adaptation */
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packet[3] |= 0x20;
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p = ngx_movemem(&packet[4] + stuff_size, &packet[4],
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p - &packet[4]);
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packet[4] = (u_char) (stuff_size - 1);
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if (stuff_size >= 2) {
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packet[5] = 0;
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ngx_memset(&packet[6], 0xff, stuff_size - 2);
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}
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}
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ngx_memcpy(p, b->pos, in_size);
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b->pos = b->last;
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}
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rc = ngx_rtmp_mpegts_write_file(file, packet, sizeof(packet));
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if (rc != NGX_OK) {
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return rc;
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}
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}
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return NGX_OK;
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}
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ngx_int_t
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ngx_rtmp_mpegts_init_encryption(ngx_rtmp_mpegts_file_t *file,
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u_char *key, size_t key_len, uint64_t iv)
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{
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if (AES_set_encrypt_key(key, key_len * 8, &file->key)) {
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return NGX_ERROR;
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}
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ngx_memzero(file->iv, 8);
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file->iv[8] = (u_char) (iv >> 56);
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file->iv[9] = (u_char) (iv >> 48);
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file->iv[10] = (u_char) (iv >> 40);
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file->iv[11] = (u_char) (iv >> 32);
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file->iv[12] = (u_char) (iv >> 24);
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file->iv[13] = (u_char) (iv >> 16);
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file->iv[14] = (u_char) (iv >> 8);
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file->iv[15] = (u_char) (iv);
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file->encrypt = 1;
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return NGX_OK;
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}
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ngx_int_t
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ngx_rtmp_mpegts_open_file(ngx_rtmp_mpegts_file_t *file, u_char *path,
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ngx_log_t *log, ngx_rtmp_codec_ctx_t *codec_ctx, ngx_uint_t mpegts_cc)
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{
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file->log = log;
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file->fd = ngx_open_file(path, NGX_FILE_WRONLY, NGX_FILE_TRUNCATE,
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NGX_FILE_DEFAULT_ACCESS);
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if (file->fd == NGX_INVALID_FILE) {
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ngx_log_error(NGX_LOG_ERR, log, ngx_errno,
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"hls: error creating fragment file");
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return NGX_ERROR;
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}
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file->size = 0;
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if (ngx_rtmp_mpegts_write_header(file, codec_ctx, mpegts_cc) != NGX_OK) {
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ngx_log_error(NGX_LOG_ERR, log, ngx_errno,
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"hls: error writing fragment header");
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ngx_close_file(file->fd);
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return NGX_ERROR;
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}
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return NGX_OK;
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}
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ngx_int_t
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ngx_rtmp_mpegts_close_file(ngx_rtmp_mpegts_file_t *file)
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{
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u_char buf[16];
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ssize_t rc;
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|
|
|
if (file->encrypt) {
|
|
ngx_memset(file->buf + file->size, 16 - file->size, 16 - file->size);
|
|
|
|
AES_cbc_encrypt(file->buf, buf, 16, &file->key, file->iv, AES_ENCRYPT);
|
|
|
|
rc = ngx_write_fd(file->fd, buf, 16);
|
|
if (rc < 0) {
|
|
return NGX_ERROR;
|
|
}
|
|
}
|
|
|
|
ngx_close_file(file->fd);
|
|
|
|
return NGX_OK;
|
|
}
|