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https://github.com/zotanmew/nginx-rtmp-module.git
synced 2024-05-02 04:03:44 +02:00
Automatically generate CRC for MPEG-TS packets.
Includes descriptions from @premultiply from pull sergey-dryabzhinsky/nginx-rtmp-module#123
This commit is contained in:
Chris Wiggins
parent
4975784d46
commit
f8992e572f
1
config
1
config
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@ -76,6 +76,7 @@ RTMP_CORE_SRCS=" \
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$ngx_addon_dir/hls/ngx_rtmp_hls_module.c \
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$ngx_addon_dir/dash/ngx_rtmp_dash_module.c \
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$ngx_addon_dir/hls/ngx_rtmp_mpegts.c \
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$ngx_addon_dir/hls/ngx_rtmp_mpegts_crc.c \
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$ngx_addon_dir/dash/ngx_rtmp_mp4.c \
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"
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RTMP_HTTP_SRCS=" \
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@ -7,24 +7,30 @@
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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_mpegts_crc.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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/* https://en.wikipedia.org/wiki/MPEG_transport_stream#Packet */
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/* TS */
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/* TS Header */
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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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0x10, // TSC(2) + AFF(1) + PF(1) + CC(4)
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0x00, // adaption_field_length(8)
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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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0x00, // table_id(8)
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0xb0, 0x0d, // 1011b(4) + section_length(12)
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0x00, 0x01, // transport_stream_id(16)
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0xc1, 0x00, 0x00, // 11b(2) + VN(5) + CNI(1), section_no(8), last_section_no(8)
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/* PAT program loop */
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0x00, 0x01, 0xef, 0xff, // program_number(16), reserved(3) + program_map_pid(13)
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/* PAT crc (CRC-32-MPEG2) */
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0x36, 0x90, 0xe2, 0x3d, // !!! Needs to be recalculated each time any bit in PAT is modified (which we dont do at the moment) !!!
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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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@ -44,19 +50,26 @@ static u_char ngx_rtmp_mpegts_header[] = {
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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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/* TS Header */
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0x47, // Sync byte
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0x4f, 0xff, // TEI(1) + PUS(1) + TP(1) + PID(13)
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0x10, // TSC(2) + AFF(1) + PF(1) + CC(4)
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0x00, // adaption_field_length(8)
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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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0x02, // table_id(8)
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0xb0, 0x12, // 1011b(4) + section_length(12) (section length set below. Ignore this value in here)
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0x00, 0x01, // program_number(16)
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0xc1, 0x00, 0x00, // 11b(2) + VN(5) + CNI(1), section_no(8), last_section_no(8)
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0xe1, 0x00, // reserved(3) + PCR_PID(13)
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0xf0, 0x00, // reserved(4) + program_info_length(12)
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/* PMT component loop, looped through when writing header */
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/* Max size of 14 bytes */
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/* Also includes the PMT CRC, calculated dynamically */
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0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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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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@ -77,18 +90,33 @@ static u_char ngx_rtmp_mpegts_header[] = {
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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_h264[] = {
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//H.264 Video, PID 0x100
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0x1b, // stream_type(8)
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0xe1, 0x00, // reserved(3) + elementary_PID(13)
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0xf0, 0x00 // reserved(4) + ES_info_length(12)
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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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//MP3 Audio, PID 0x101
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0x03, // stream_type(8)
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0xe1, 0x01, // reserved(3) + elementary_PID(13)
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0xf0, 0x00 // reserved(4) + ES_info_length(12)
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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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//ADTS AAC Audio, PID 0x101
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0x0f, // stream_type(8)
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0xe1, 0x01, // reserved(3) + elementary_PID(13)
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0xf0, 0x00 // reserved(4) + ES_info_length(12)
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};
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#define NGX_RTMP_MPEGTS_PMT_CRC_START_OFFSET 193
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#define NGX_RTMP_MPEGTS_PMT_CRC_MIN_LENGTH 12
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#define NGX_RTMP_MPEGTS_PMT_SECTION_LENGTH_OFFSET 195
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#define NGX_RTMP_MPEGTS_PMT_LOOP_OFFSET 205
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#define NGX_RTMP_MPEGTS_PID_SIZE 5
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/* 700 ms PCR delay */
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#define NGX_RTMP_HLS_DELAY 63000
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@ -171,87 +199,55 @@ ngx_rtmp_mpegts_write_file(ngx_rtmp_mpegts_file_t *file, u_char *in,
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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_set_audio_header(ngx_rtmp_codec_ctx_t *codec_ctx, ngx_uint_t mpegts_cc)
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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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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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ngx_int_t next_pid_offset = 0; //Used to track the number of PIDs we have and the offset in 5-byte chunks
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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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//MPEG-TS CC is 4 bits long. Need to truncate it here.
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mpegts_cc %= 0x0f;
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// And then put it in the 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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//ngx_rtmp_mpegts_header
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if (codec_ctx->video_codec_id)
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{
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/* Write the audio headers */
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ngx_rtmp_mpegts_set_audio_header(codec_ctx, mpegts_cc);
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//Put h264 PID in the PMT
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ngx_memcpy(ngx_rtmp_mpegts_header+NGX_RTMP_MPEGTS_PMT_LOOP_OFFSET+next_pid_offset, ngx_rtmp_mpegts_header_h264, NGX_RTMP_MPEGTS_PID_SIZE);
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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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/* Write the audio headers */
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ngx_rtmp_mpegts_set_audio_header(codec_ctx, mpegts_cc);
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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 video 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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next_pid_offset += NGX_RTMP_MPEGTS_PID_SIZE;
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}
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return rc;
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if (codec_ctx->audio_codec_id){
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//Put Audio PID in the PMT
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if (codec_ctx->audio_codec_id == NGX_RTMP_AUDIO_AAC) {
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ngx_memcpy(ngx_rtmp_mpegts_header+NGX_RTMP_MPEGTS_PMT_LOOP_OFFSET+next_pid_offset, ngx_rtmp_mpegts_header_aac, NGX_RTMP_MPEGTS_PID_SIZE);
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}
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else
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{
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ngx_memcpy(ngx_rtmp_mpegts_header+NGX_RTMP_MPEGTS_PMT_LOOP_OFFSET+next_pid_offset, ngx_rtmp_mpegts_header_mp3, NGX_RTMP_MPEGTS_PID_SIZE);
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}
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next_pid_offset += NGX_RTMP_MPEGTS_PID_SIZE;
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}
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//Set section length of PMT
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//PMT is 13 bytes long without any programs in it. Add this in
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ngx_rtmp_mpegts_header[NGX_RTMP_MPEGTS_PMT_SECTION_LENGTH_OFFSET] = 13 + next_pid_offset;
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//Calculate CRC
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ngx_rtmp_mpegts_crc_t crc = ngx_rtmp_mpegts_crc_init();
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crc = ngx_rtmp_mpegts_crc_update(crc, ngx_rtmp_mpegts_header+NGX_RTMP_MPEGTS_PMT_CRC_START_OFFSET, NGX_RTMP_MPEGTS_PMT_CRC_MIN_LENGTH+next_pid_offset);
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crc = ngx_rtmp_mpegts_crc_finalize(crc);
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ngx_rtmp_mpegts_header[NGX_RTMP_MPEGTS_PMT_LOOP_OFFSET+next_pid_offset] = (crc >> 24) & 0xff;
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ngx_rtmp_mpegts_header[NGX_RTMP_MPEGTS_PMT_LOOP_OFFSET+next_pid_offset+1] = (crc >> 16) & 0xff;
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ngx_rtmp_mpegts_header[NGX_RTMP_MPEGTS_PMT_LOOP_OFFSET+next_pid_offset+2] = (crc >> 8) & 0xff;
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ngx_rtmp_mpegts_header[NGX_RTMP_MPEGTS_PMT_LOOP_OFFSET+next_pid_offset+3] = crc & 0xff;
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return ngx_rtmp_mpegts_write_file(file, ngx_rtmp_mpegts_header, sizeof(ngx_rtmp_mpegts_header));
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}
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80
hls/ngx_rtmp_mpegts_crc.c
Normal file
80
hls/ngx_rtmp_mpegts_crc.c
Normal file
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@ -0,0 +1,80 @@
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/**
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* \file crc.c
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* Functions and types for CRC checks.
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*
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* Generated on Thu May 5 15:32:31 2016,
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* by pycrc v0.9, https://pycrc.org
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* using the configuration:
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* Width = 32
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* Poly = 0x04c11db7
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* Xor_In = 0xffffffff
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* ReflectIn = False
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* Xor_Out = 0x00000000
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* ReflectOut = False
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* Algorithm = table-driven
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*****************************************************************************/
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#include "ngx_rtmp_mpegts_crc.h" /* include the header file generated with pycrc */
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#include <stdlib.h>
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#include <stdint.h>
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/**
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* Static table used for the table_driven implementation.
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*****************************************************************************/
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static const ngx_rtmp_mpegts_crc_t ngx_rtmp_mpegts_crc_table[256] = {
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0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
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0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
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0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
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0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
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0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
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0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
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0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
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0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
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0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
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0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
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0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
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0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
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0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
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0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
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0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
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0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
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0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
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0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
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0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
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0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
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0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
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0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
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0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
|
||||
0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
|
||||
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
|
||||
0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
|
||||
0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
|
||||
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
|
||||
0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
|
||||
0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
|
||||
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
|
||||
0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
|
||||
};
|
||||
|
||||
/**
|
||||
* Update the crc value with new data.
|
||||
*
|
||||
* \param crc The current crc value.
|
||||
* \param data Pointer to a buffer of \a data_len bytes.
|
||||
* \param data_len Number of bytes in the \a data buffer.
|
||||
* \return The updated crc value.
|
||||
*****************************************************************************/
|
||||
ngx_rtmp_mpegts_crc_t ngx_rtmp_mpegts_crc_update(ngx_rtmp_mpegts_crc_t crc, const void *data, size_t data_len)
|
||||
{
|
||||
const unsigned char *d = (const unsigned char *)data;
|
||||
unsigned int tbl_idx;
|
||||
|
||||
while (data_len--) {
|
||||
tbl_idx = ((crc >> 24) ^ *d) & 0xff;
|
||||
crc = (ngx_rtmp_mpegts_crc_table[tbl_idx] ^ (crc << 8)) & 0xffffffff;
|
||||
|
||||
d++;
|
||||
}
|
||||
return crc & 0xffffffff;
|
||||
}
|
||||
|
||||
|
||||
83
hls/ngx_rtmp_mpegts_crc.h
Normal file
83
hls/ngx_rtmp_mpegts_crc.h
Normal file
|
|
@ -0,0 +1,83 @@
|
|||
/**
|
||||
* \file crc.h
|
||||
* Functions and types for CRC checks.
|
||||
*
|
||||
* Generated on Thu May 5 15:32:22 2016,
|
||||
* by pycrc v0.9, https://pycrc.org
|
||||
* using the configuration:
|
||||
* Width = 32
|
||||
* Poly = 0x04c11db7
|
||||
* Xor_In = 0xffffffff
|
||||
* ReflectIn = False
|
||||
* Xor_Out = 0x00000000
|
||||
* ReflectOut = False
|
||||
* Algorithm = table-driven
|
||||
*****************************************************************************/
|
||||
#ifndef _NGX_RTMP_MPEGTS_CRC_H_INCLUDED_
|
||||
#define _NGX_RTMP_MPEGTS_CRC_H_INCLUDED_
|
||||
|
||||
|
||||
#include <stdlib.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
|
||||
/**
|
||||
* The definition of the used algorithm.
|
||||
*
|
||||
* This is not used anywhere in the generated code, but it may be used by the
|
||||
* application code to call algoritm-specific code, is desired.
|
||||
*****************************************************************************/
|
||||
#define CRC_ALGO_TABLE_DRIVEN 1
|
||||
|
||||
|
||||
/**
|
||||
* The type of the CRC values.
|
||||
*
|
||||
* This type must be big enough to contain at least 32 bits.
|
||||
*****************************************************************************/
|
||||
typedef uint_fast32_t ngx_rtmp_mpegts_crc_t;
|
||||
|
||||
|
||||
/**
|
||||
* Calculate the initial crc value.
|
||||
*
|
||||
* \return The initial crc value.
|
||||
*****************************************************************************/
|
||||
static inline ngx_rtmp_mpegts_crc_t ngx_rtmp_mpegts_crc_init(void)
|
||||
{
|
||||
return 0xffffffff;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Update the crc value with new data.
|
||||
*
|
||||
* \param crc The current crc value.
|
||||
* \param data Pointer to a buffer of \a data_len bytes.
|
||||
* \param data_len Number of bytes in the \a data buffer.
|
||||
* \return The updated crc value.
|
||||
*****************************************************************************/
|
||||
ngx_rtmp_mpegts_crc_t ngx_rtmp_mpegts_crc_update(ngx_rtmp_mpegts_crc_t crc, const void *data, size_t data_len);
|
||||
|
||||
|
||||
/**
|
||||
* Calculate the final crc value.
|
||||
*
|
||||
* \param crc The current crc value.
|
||||
* \return The final crc value.
|
||||
*****************************************************************************/
|
||||
static inline ngx_rtmp_mpegts_crc_t ngx_rtmp_mpegts_crc_finalize(ngx_rtmp_mpegts_crc_t crc)
|
||||
{
|
||||
return crc ^ 0x00000000;
|
||||
}
|
||||
|
||||
|
||||
#ifdef __cplusplus
|
||||
} /* closing brace for extern "C" */
|
||||
#endif
|
||||
|
||||
#endif /* _NGX_RTMP_MPEGTS_CRC_H_INCLUDED_ */
|
||||
Loading…
Reference in a new issue