refine code, remove the base dts, donot drop start BP frames

-/*
-The MIT License (MIT)
-
-Copyright (c) 2013 winlin
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-the Software, and to permit persons to whom the Software is furnished to do so,
-subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-*/
-
-#include <srs_core_hls.hpp>
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <srs_core_error.hpp>
-#include <srs_core_codec.hpp>
-#include <srs_core_amf0.hpp>
-#include <srs_core_protocol.hpp>
-#include <srs_core_config.hpp>
-
-SrsHLS::SrsHLS()
-{
-	hls_enabled = false;
-	codec = new SrsCodec();
-	sample = new SrsCodecSample();
-	muxer = NULL;
-}
-
-SrsHLS::~SrsHLS()
-{
-	srs_freep(codec);
-	srs_freep(sample);
-	srs_freep(muxer);
-}
-
-int SrsHLS::on_publish(std::string _vhost)
-{
-	int ret = ERROR_SUCCESS;
-
-	if (muxer) {
-		ret = ERROR_HLS_BUSY;
-		srs_error("hls is busy, something error, "
-			"vhost=%s, ret=%d", _vhost.c_str(), ret);
-		return ret;
-	}
-	
-	vhost = _vhost;
-	muxer = new SrsTSMuxer();
-	
-	// try to open the HLS muxer
-	SrsConfDirective* conf = config->get_hls(vhost);
-	if (!conf && conf->arg0() == "off") {
-		return ret;
-	}
-	
-	// TODO: check the audio and video, ensure both exsists.
-	// for use fixed mpegts header specifeid the audio and video pid.
-
-	hls_enabled = true;
-	
-	std::string path = SRS_CONF_DEFAULT_HLS_PATH;
-	if ((conf = config->get_hls_path(vhost)) != NULL) {
-		path = conf->arg0();
-	}
-	
-	// TODO: generate by m3u8 muxer.
-	path += "/1.ts";
-	
-	if ((ret = muxer->open(path)) != ERROR_SUCCESS) {
-		srs_error("open hls muxer failed. ret=%d", ret);
-		return ret;
-	}
-	
-	return ret;
-}
-
-void SrsHLS::on_unpublish()
-{
-	hls_enabled = false;
-	muxer->close();
-	srs_freep(muxer);
-}
-
-int SrsHLS::on_meta_data(SrsOnMetaDataPacket* metadata)
-{
-	int ret = ERROR_SUCCESS;
-
-	if (!metadata || !metadata->metadata) {
-		srs_trace("no metadata persent, hls ignored it.");
-		return ret;
-	}
-	
-	SrsAmf0Object* obj = metadata->metadata;
-	if (obj->size() <= 0) {
-		srs_trace("no metadata persent, hls ignored it.");
-		return ret;
-	}
-	
-	//	finger out the codec info from metadata if possible.
-	SrsAmf0Any* prop = NULL;
-
-	if ((prop = obj->get_property("duration")) != NULL && prop->is_number()) {
-		codec->duration = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
-	}
-	if ((prop = obj->get_property("width")) != NULL && prop->is_number()) {
-		codec->width = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
-	}
-	if ((prop = obj->get_property("height")) != NULL && prop->is_number()) {
-		codec->height = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
-	}
-	if ((prop = obj->get_property("framerate")) != NULL && prop->is_number()) {
-		codec->frame_rate = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
-	}
-	if ((prop = obj->get_property("videocodecid")) != NULL && prop->is_number()) {
-		codec->video_codec_id = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
-	}
-	if ((prop = obj->get_property("videodatarate")) != NULL && prop->is_number()) {
-		codec->video_data_rate = (int)(1000 * srs_amf0_convert<SrsAmf0Number>(prop)->value);
-	}
-	
-	if ((prop = obj->get_property("audiocodecid")) != NULL && prop->is_number()) {
-		codec->audio_codec_id = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
-	}
-	if ((prop = obj->get_property("audiodatarate")) != NULL && prop->is_number()) {
-		codec->audio_data_rate = (int)(1000 * srs_amf0_convert<SrsAmf0Number>(prop)->value);
-	}
-	
-	// ignore the following, for each flv/rtmp packet contains them:
-	// audiosamplerate, sample->sound_rate
-	// audiosamplesize, sample->sound_size
-	// stereo, 			sample->sound_type
-	
-	return ret;
-}
-
-int SrsHLS::on_audio(SrsCommonMessage* audio)
-{
-	int ret = ERROR_SUCCESS;
-	
-	sample->clear();
-	if ((ret = codec->audio_aac_demux(audio->payload, audio->size, sample)) != ERROR_SUCCESS) {
-		return ret;
-	}
-	
-	if (codec->audio_codec_id != SrsCodecAudioAAC) {
-		return ret;
-	}
-	
-	// TODO: maybe donot need to demux the aac?
-	if (!hls_enabled) {
-		return ret;
-	}
-	
-	// ignore sequence header
-	if (sample->aac_packet_type == SrsCodecAudioTypeSequenceHeader) {
-		return ret;
-	}
-	
-	u_int32_t timestamp = audio->header.timestamp;
-	// TODO: correct the timestamp.
-	
-	if ((ret = muxer->write_audio(timestamp, codec, sample)) != ERROR_SUCCESS) {
-		return ret;
-	}
-	
-	return ret;
-}
-
-int SrsHLS::on_video(SrsCommonMessage* video)
-{
-	int ret = ERROR_SUCCESS;
-	
-	sample->clear();
-	if ((ret = codec->video_avc_demux(video->payload, video->size, sample)) != ERROR_SUCCESS) {
-		return ret;
-	}
-	
-	if (codec->video_codec_id != SrsCodecVideoAVC) {
-		return ret;
-	}
-	
-	// TODO: maybe donot need to demux the avc?
-	if (!hls_enabled) {
-		return ret;
-	}
-	
-	// ignore sequence header
-	if (sample->frame_type == SrsCodecVideoAVCFrameKeyFrame && sample->avc_packet_type == SrsCodecVideoAVCTypeSequenceHeader) {
-		return ret;
-	}
-	
-	u_int32_t timestamp = video->header.timestamp;
-	// TODO: correct the timestamp.
-	
-	if ((ret = muxer->write_video(timestamp, codec, sample)) != ERROR_SUCCESS) {
-		return ret;
-	}
-	
-	return ret;
-}
-
-// @see: ngx_rtmp_mpegts_header
-u_int8_t mpegts_header[] = {
-    /* TS */
-    0x47, 0x40, 0x00, 0x10, 0x00,
-    /* PSI */
-    0x00, 0xb0, 0x0d, 0x00, 0x01, 0xc1, 0x00, 0x00,
-    /* PAT */
-    0x00, 0x01, 0xf0, 0x01,
-    /* CRC */
-    0x2e, 0x70, 0x19, 0x05,
-    /* stuffing 167 bytes */
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    
-    /* TS */
-    0x47, 0x50, 0x01, 0x10, 0x00,
-    /* PSI */
-    0x02, 0xb0, 0x17, 0x00, 0x01, 0xc1, 0x00, 0x00,
-    /* PMT */
-    0xe1, 0x00,
-    0xf0, 0x00,
-    0x1b, 0xe1, 0x00, 0xf0, 0x00, /* h264, pid=0x100=256 */
-    0x0f, 0xe1, 0x01, 0xf0, 0x00, /* aac, pid=0x101=257 */
-    /*0x03, 0xe1, 0x01, 0xf0, 0x00,*/ /* mp3 */
-    /* CRC */
-    0x2f, 0x44, 0xb9, 0x9b, /* crc for aac */
-    /*0x4e, 0x59, 0x3d, 0x1e,*/ /* crc for mp3 */
-    /* stuffing 157 bytes */
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
-};
-
-// @see: NGX_RTMP_HLS_DELAY, 
-// 63000: 700ms, ts_tbn=90000
-#define SRS_HLS_DELAY 63000
-
-// @see: ngx_rtmp_SrsMpegtsFrame_t
-struct SrsMpegtsFrame
-{
-    int64_t		pts;
-    int64_t		dts;
-    int  		pid;
-    int			sid;
-    int			cc;
-    bool		key;
-    
-    SrsMpegtsFrame()
-    {
-        pts = dts = 0;
-        pid = sid = cc = 0;
-        key = false;
-    }
-};
-
-// @see: ngx_rtmp_mpegts.c
-// TODO: support full mpegts feature in future.
-class SrsMpegtsWriter
-{
-public:
-	static int write_header(int fd)
-	{
-		int ret = ERROR_SUCCESS;
-		
-		if (::write(fd, mpegts_header, sizeof(mpegts_header)) != sizeof(mpegts_header)) {
-			ret = ERROR_HLS_WRITE_FAILED;
-			srs_error("write ts file header failed. ret=%d", ret);
-			return ret;
-		}
-
-		return ret;
-	}
-	static int write_frame(int fd, SrsMpegtsFrame* frame, SrsCodecBuffer* buffer)
-	{
-		int ret = ERROR_SUCCESS;
-		
-		if (!buffer->bytes || buffer->size <= 0) {
-			return ret;
-		}
-		
-		char* last = buffer->bytes + buffer->size;
-		char* pos = buffer->bytes;
-		
-		bool first = true;
-		while (pos < last) {
-			static char packet[188];
-			char* p = packet;
-			
-			frame->cc++;
-			
-			// sync_byte; //8bits
-			*p++ = 0x47;
-			// pid; //13bits
-			*p++ = (frame->pid >> 8) & 0x1f;
-			// payload_unit_start_indicator; //1bit
-			if (first) {
-				p[-1] |= 0x40;
-			}
-			*p++ = frame->pid;
-			
-			// transport_scrambling_control; //2bits
-			// adaption_field_control; //2bits, 0x01: PayloadOnly
-			// continuity_counter; //4bits
-			*p++ = 0x10 | (frame->cc & 0x0f);
-			
-			if (first) {
-				first = false;
-				if (frame->key) {
-					p[-1] |= 0x20; // Both Adaption and Payload
-					*p++ = 7;    // size
-					*p++ = 0x50; // random access + PCR
-					p = write_pcr(p, frame->dts - SRS_HLS_DELAY);
-				}
-				
-				// PES header
-				// packet_start_code_prefix; //24bits, '00 00 01'
-				*p++ = 0x00;
-				*p++ = 0x00;
-				*p++ = 0x01;
-				//8bits
-				*p++ = frame->sid;
-				
-				// pts(33bits) need 5bytes.
-				u_int8_t header_size = 5;
-				u_int8_t flags = 0x80; // pts
-				
-				// dts(33bits) need 5bytes also
-				if (frame->dts != frame->pts) {
-					header_size += 5;
-					flags |= 0x40; // dts
-				}
-				
-				// 3bytes: flag fields from PES_packet_length to PES_header_data_length
-				int pes_size = (last - pos) + header_size + 3;
-				if (pes_size > 0xffff) {
-					/**
-					* when actual packet length > 0xffff(65535),
-					* which exceed the max u_int16_t packet length,
-					* use 0 packet length, the next unit start indicates the end of packet.
-					*/
-					pes_size = 0;
-				}
-				
-				// PES_packet_length; //16bits
-				*p++ = (pes_size >> 8);
-				*p++ = pes_size;
-				
-				// PES_scrambling_control; //2bits, '10'
-				// PES_priority; //1bit
-				// data_alignment_indicator; //1bit
-				// copyright; //1bit
-				// original_or_copy; //1bit	
-				*p++ = 0x80; /* H222 */
-				
-				// PTS_DTS_flags; //2bits
-				// ESCR_flag; //1bit
-				// ES_rate_flag; //1bit
-				// DSM_trick_mode_flag; //1bit
-				// additional_copy_info_flag; //1bit
-				// PES_CRC_flag; //1bit
-				// PES_extension_flag; //1bit
-				*p++ = flags;
-				
-				// PES_header_data_length; //8bits
-				*p++ = header_size;
-
-				// pts; // 33bits
-				p = write_pts(p, flags >> 6, frame->pts + SRS_HLS_DELAY);
-				
-				// dts; // 33bits
-				if (frame->dts != frame->pts) {
-					p = write_pts(p, 1, frame->dts + SRS_HLS_DELAY);
-				}
-			}
-			
-			int body_size = sizeof(packet) - (p - packet);
-			int in_size = last - pos;
-			
-			if (body_size <= in_size) {
-				memcpy(p, pos, body_size);
-				pos += body_size;
-			} else {
-				p = fill_stuff(p, packet, body_size, in_size);
-				memcpy(p, pos, in_size);
-				pos = last;
-			}
-			
-			// write ts packet
-			if (::write(fd, packet, sizeof(packet)) != sizeof(packet)) {
-				ret = ERROR_HLS_WRITE_FAILED;
-				srs_error("write ts file failed. ret=%d", ret);
-				return ret;
-			}
-		}
-		
-		// write success, clear and free the buffer
-		buffer->free();
-		
-		return ret;
-	}
-private:
-	static char* fill_stuff(char* pes_body_end, char* packet, int body_size, int in_size)
-	{
-		char* p = pes_body_end;
-		
-		// insert the stuff bytes before PES body
-		int stuff_size = (body_size - in_size);
-		
-		// adaption_field_control; //2bits
-		if (packet[3] & 0x20) {
-			//  has adaptation
-			// packet[4]: adaption_field_length
-			// packet[5]: adaption field data
-			// base: start of PES body
-			char* base = &packet[5] + packet[4];
-			int len = p - base;
-			p = (char*)memmove(base + stuff_size, base, len) + len;
-			// increase the adaption field size.
-			packet[4] += stuff_size;
-			
-			return p;
-		}
-
-		// create adaption field.
-		// adaption_field_control; //2bits
-		packet[3] |= 0x20;
-		// base: start of PES body
-		char* base = &packet[4];
-		int len = p - base;
-		p = (char*)memmove(base + stuff_size, base, len) + len;
-		// adaption_field_length; //8bits
-		packet[4] = (stuff_size - 1);
-		if (stuff_size >= 2) {
-			// adaption field flags.
-			packet[5] = 0;
-			// adaption data.
-			if (stuff_size > 2) {
-				memset(&packet[6], 0xff, stuff_size - 2);
-			}
-		}
-		
-		return p;
-	}
-	static char* write_pcr(char* p, int64_t pcr)
-	{
-	    *p++ = (char) (pcr >> 25);
-	    *p++ = (char) (pcr >> 17);
-	    *p++ = (char) (pcr >> 9);
-	    *p++ = (char) (pcr >> 1);
-	    *p++ = (char) (pcr << 7 | 0x7e);
-	    *p++ = 0;
-	
-	    return p;
-	}
-	static char* write_pts(char* p, u_int8_t fb, int64_t pts)
-	{
-	    int32_t val;
-	
-	    val = fb << 4 | (((pts >> 30) & 0x07) << 1) | 1;
-	    *p++ = val;
-	
-	    val = (((pts >> 15) & 0x7fff) << 1) | 1;
-	    *p++ = (val >> 8);
-	    *p++ = val;
-	
-	    val = (((pts) & 0x7fff) << 1) | 1;
-	    *p++ = (val >> 8);
-	    *p++ = val;
-	
-	    return p;
-	}
-};
-
-// the mpegts header specifed the video/audio pid.
-#define TS_VIDEO_PID 256
-#define TS_AUDIO_PID 257
-
-// ts aac stream id.
-#define TS_AUDIO_AAC 0xc0
-// ts avc stream id.
-#define TS_VIDEO_AVC 0xe0
-
-SrsTSMuxer::SrsTSMuxer()
-{
-	fd = -1;
-	
-	audio_buffer = new SrsCodecBuffer();
-	video_buffer = new SrsCodecBuffer();
-	
-	audio_frame = new SrsMpegtsFrame();
-	video_frame = new SrsMpegtsFrame();
-}
-
-SrsTSMuxer::~SrsTSMuxer()
-{
-	close();
-	
-	audio_buffer->free();
-	video_buffer->free();
-	
-	srs_freep(audio_buffer);
-	srs_freep(video_buffer);
-	
-	srs_freep(audio_frame);
-	srs_freep(video_frame);
-}
-
-int SrsTSMuxer::open(std::string _path)
-{
-	int ret = ERROR_SUCCESS;
-	
-	path = _path;
-	
-	close();
-	
-	int flags = O_CREAT|O_WRONLY|O_TRUNC;
-	mode_t mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH;
-	if ((fd = ::open(path.c_str(), flags, mode)) < 0) {
-		ret = ERROR_HLS_OPEN_FAILED;
-		srs_error("open ts file %s failed. ret=%d", path.c_str(), ret);
-		return ret;
-	}
-
-	// write mpegts header
-	if ((ret = SrsMpegtsWriter::write_header(fd)) != ERROR_SUCCESS) {
-		return ret;
-	}
-	
-	return ret;
-}
-
-int SrsTSMuxer::write_audio(u_int32_t time, SrsCodec* codec, SrsCodecSample* sample)
-{
-	int ret = ERROR_SUCCESS;
-	
-	if (!audio_frame) {
-		audio_frame = new SrsMpegtsFrame();
-		audio_frame->dts = audio_frame->pts = time * 90;
-		audio_frame->pid = TS_AUDIO_PID;
-		audio_frame->sid = TS_AUDIO_AAC;
-	}
-	
-	for (int i = 0; i < sample->nb_buffers; i++) {
-		SrsCodecBuffer* buf = &sample->buffers[i];
-		int32_t size = buf->size;
-		
-		if (!buf->bytes || size <= 0 || size > 0x1fff) {
-			ret = ERROR_HLS_AAC_FRAME_LENGTH;
-			srs_error("invalid aac frame length=%d, ret=%d", size, ret);
-			return ret;
-		}
-		
-		// the frame length is the AAC raw data plus the adts header size.
-		int32_t frame_length = size + 7;
-		
-		// AAC-ADTS
-		// 6.2 Audio Data Transport Stream, ADTS
-		// in aac-iso-13818-7.pdf, page 26.
-		// fixed 7bytes header
-		static u_int8_t adts_header[7] = {0xff, 0xf1, 0x00, 0x00, 0x00, 0x0f, 0xfc};
-		/*
-		// adts_fixed_header
-		// 2B, 16bits
-		int16_t syncword; //12bits, '1111 1111 1111'
-		int8_t ID; //1bit, '0'
-		int8_t layer; //2bits, '00'
-		int8_t protection_absent; //1bit, can be '1'
-		// 12bits
-		int8_t profile; //2bit, 7.1 Profiles, page 40
-		TSAacSampleFrequency sampling_frequency_index; //4bits, Table 35, page 46
-		int8_t private_bit; //1bit, can be '0'
-		int8_t channel_configuration; //3bits, Table 8
-		int8_t original_or_copy; //1bit, can be '0'
-		int8_t home; //1bit, can be '0'
-		
-		// adts_variable_header
-		// 28bits
-		int8_t copyright_identification_bit; //1bit, can be '0'
-		int8_t copyright_identification_start; //1bit, can be '0'
-		int16_t frame_length; //13bits
-		int16_t adts_buffer_fullness; //11bits, 7FF signals that the bitstream is a variable rate bitstream.
-		int8_t number_of_raw_data_blocks_in_frame; //2bits, 0 indicating 1 raw_data_block()
-		*/
-		// profile, 2bits
-		adts_header[2] = (codec->aac_profile << 6) & 0xc0;
-		// sampling_frequency_index 4bits
-		adts_header[2] |= (codec->aac_sample_rate << 2) & 0x3c;
-		// channel_configuration 3bits
-		adts_header[2] |= (codec->aac_channels >> 2) & 0x01;
-		adts_header[3] = (codec->aac_channels << 6) & 0xc0;
-		// frame_length 13bits
-		adts_header[3] |= (frame_length >> 11) & 0x03;
-		adts_header[4] = (frame_length >> 3) & 0xff;
-		adts_header[5] = ((frame_length << 5) & 0xe0);
-		// adts_buffer_fullness; //11bits
-		adts_header[5] |= 0x1f;
-
-		// copy to audio buffer
-		audio_buffer->append(adts_header, sizeof(adts_header));
-		audio_buffer->append(buf->bytes, buf->size);
-	}
-	
-	return ret;
-}
-
-int SrsTSMuxer::write_video(u_int32_t time, SrsCodec* codec, SrsCodecSample* sample)
-{
-	int ret = ERROR_SUCCESS;
-	
-	video_frame->dts = time * 90;
-	video_frame->pts = video_frame->dts + sample->cts * 90;
-	video_frame->pid = TS_VIDEO_PID;
-	video_frame->sid = TS_VIDEO_AVC;
-	video_frame->key = sample->frame_type == SrsCodecVideoAVCFrameKeyFrame;
-	
-	static u_int8_t aud_nal[] = { 0x00, 0x00, 0x00, 0x01, 0x09, 0xf0 };
-	video_buffer->append(aud_nal, sizeof(aud_nal));
-	
-	bool sps_pps_sent = false;
-	for (int i = 0; i < sample->nb_buffers; i++) {
-		SrsCodecBuffer* buf = &sample->buffers[i];
-		int32_t size = buf->size;
-		
-		if (!buf->bytes || size <= 0) {
-			ret = ERROR_HLS_AVC_SAMPLE_SIZE;
-			srs_error("invalid avc sample length=%d, ret=%d", size, ret);
-			return ret;
-		}
-		
-		// 5bits, 7.3.1 NAL unit syntax, 
-		// H.264-AVC-ISO_IEC_14496-10.pdf, page 44.
-		u_int8_t nal_unit_type;
-		nal_unit_type = *buf->bytes;
-		nal_unit_type &= 0x1f;
-		
-		// Table 7-1 – NAL unit type codes, page 61
-		// 1: Coded slice
-		if (nal_unit_type == 1) {
-			sps_pps_sent = false;
-		}
-		// 5: Coded slice of an IDR picture.
-		// insert sps/pps before IDR or key frame is ok.
-		if (nal_unit_type == 5 && !sps_pps_sent) {
-		//if (video_frame->key && !sps_pps_sent) {
-			sps_pps_sent = true;
-			
-			// ngx_rtmp_hls_append_sps_pps
-			if (codec->sequenceParameterSetLength > 0) {
-				// AnnexB prefix
-				video_buffer->append(aud_nal, 4);
-				// sps
-				video_buffer->append(codec->sequenceParameterSetNALUnit, codec->sequenceParameterSetLength);
-			}
-			if (codec->pictureParameterSetLength > 0) {
-				// AnnexB prefix
-				video_buffer->append(aud_nal, 4);
-				// pps
-				video_buffer->append(codec->pictureParameterSetNALUnit, codec->pictureParameterSetLength);
-			}
-		}
-		
-		// sample start prefix, '00 00 00 01' or '00 00 01'
-		u_int8_t* p = aud_nal + 1;
-		u_int8_t* end = p + 3;
-		
-		// first AnnexB prefix is long (4 bytes)
-		if (i == 0) {
-			p = aud_nal;
-		}
-		video_buffer->append(p, end - p);
-		
-		// sample data
-		video_buffer->append(buf->bytes, buf->size);
-	}
-	
-	if ((ret = SrsMpegtsWriter::write_frame(fd, video_frame, video_buffer)) != ERROR_SUCCESS) {
-		return ret;
-	}
-	
-	if ((ret = SrsMpegtsWriter::write_frame(fd, audio_frame, audio_buffer)) != ERROR_SUCCESS) {
-		return ret;
-	}
-	srs_freep(audio_frame);
-	
-	return ret;
-}
-
-void SrsTSMuxer::close()
-{
-	if (fd > 0) {
-		::close(fd);
-		fd = -1;
-	}
-}
-
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <srs_core_hls.hpp>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <srs_core_error.hpp>
+#include <srs_core_codec.hpp>
+#include <srs_core_amf0.hpp>
+#include <srs_core_protocol.hpp>
+#include <srs_core_config.hpp>
+
+SrsHLS::SrsHLS()
+{
+	hls_enabled = false;
+	codec = new SrsCodec();
+	sample = new SrsCodecSample();
+	muxer = NULL;
+}
+
+SrsHLS::~SrsHLS()
+{
+	srs_freep(codec);
+	srs_freep(sample);
+	srs_freep(muxer);
+}
+
+int SrsHLS::on_publish(std::string _vhost)
+{
+	int ret = ERROR_SUCCESS;
+
+	if (muxer) {
+		ret = ERROR_HLS_BUSY;
+		srs_error("hls is busy, something error, "
+			"vhost=%s, ret=%d", _vhost.c_str(), ret);
+		return ret;
+	}
+	
+	vhost = _vhost;
+	muxer = new SrsTSMuxer();
+	
+	// try to open the HLS muxer
+	SrsConfDirective* conf = config->get_hls(vhost);
+	if (!conf && conf->arg0() == "off") {
+		return ret;
+	}
+	
+	// TODO: check the audio and video, ensure both exsists.
+	// for use fixed mpegts header specifeid the audio and video pid.
+
+	hls_enabled = true;
+	
+	std::string path = SRS_CONF_DEFAULT_HLS_PATH;
+	if ((conf = config->get_hls_path(vhost)) != NULL) {
+		path = conf->arg0();
+	}
+	
+	// TODO: generate by m3u8 muxer.
+	path += "/1.ts";
+	
+	if ((ret = muxer->open(path)) != ERROR_SUCCESS) {
+		srs_error("open hls muxer failed. ret=%d", ret);
+		return ret;
+	}
+	
+	return ret;
+}
+
+void SrsHLS::on_unpublish()
+{
+	hls_enabled = false;
+	muxer->close();
+	srs_freep(muxer);
+}
+
+int SrsHLS::on_meta_data(SrsOnMetaDataPacket* metadata)
+{
+	int ret = ERROR_SUCCESS;
+
+	if (!metadata || !metadata->metadata) {
+		srs_trace("no metadata persent, hls ignored it.");
+		return ret;
+	}
+	
+	SrsAmf0Object* obj = metadata->metadata;
+	if (obj->size() <= 0) {
+		srs_trace("no metadata persent, hls ignored it.");
+		return ret;
+	}
+	
+	//	finger out the codec info from metadata if possible.
+	SrsAmf0Any* prop = NULL;
+
+	if ((prop = obj->get_property("duration")) != NULL && prop->is_number()) {
+		codec->duration = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("width")) != NULL && prop->is_number()) {
+		codec->width = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("height")) != NULL && prop->is_number()) {
+		codec->height = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("framerate")) != NULL && prop->is_number()) {
+		codec->frame_rate = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("videocodecid")) != NULL && prop->is_number()) {
+		codec->video_codec_id = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("videodatarate")) != NULL && prop->is_number()) {
+		codec->video_data_rate = (int)(1000 * srs_amf0_convert<SrsAmf0Number>(prop)->value);
+	}
+	
+	if ((prop = obj->get_property("audiocodecid")) != NULL && prop->is_number()) {
+		codec->audio_codec_id = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("audiodatarate")) != NULL && prop->is_number()) {
+		codec->audio_data_rate = (int)(1000 * srs_amf0_convert<SrsAmf0Number>(prop)->value);
+	}
+	
+	// ignore the following, for each flv/rtmp packet contains them:
+	// audiosamplerate, sample->sound_rate
+	// audiosamplesize, sample->sound_size
+	// stereo, 			sample->sound_type
+	
+	return ret;
+}
+
+int SrsHLS::on_audio(SrsCommonMessage* audio)
+{
+	int ret = ERROR_SUCCESS;
+	
+	sample->clear();
+	if ((ret = codec->audio_aac_demux(audio->payload, audio->size, sample)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	if (codec->audio_codec_id != SrsCodecAudioAAC) {
+		return ret;
+	}
+	
+	// TODO: maybe donot need to demux the aac?
+	if (!hls_enabled) {
+		return ret;
+	}
+	
+	// ignore sequence header
+	if (sample->aac_packet_type == SrsCodecAudioTypeSequenceHeader) {
+		return ret;
+	}
+	
+	u_int32_t timestamp = audio->header.timestamp;
+	// TODO: correct the timestamp.
+	
+	if ((ret = muxer->write_audio(timestamp, codec, sample)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	return ret;
+}
+
+int SrsHLS::on_video(SrsCommonMessage* video)
+{
+	int ret = ERROR_SUCCESS;
+	
+	sample->clear();
+	if ((ret = codec->video_avc_demux(video->payload, video->size, sample)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	if (codec->video_codec_id != SrsCodecVideoAVC) {
+		return ret;
+	}
+	
+	// TODO: maybe donot need to demux the avc?
+	if (!hls_enabled) {
+		return ret;
+	}
+	
+	// ignore sequence header
+	if (sample->frame_type == SrsCodecVideoAVCFrameKeyFrame && sample->avc_packet_type == SrsCodecVideoAVCTypeSequenceHeader) {
+		return ret;
+	}
+	
+	u_int32_t timestamp = video->header.timestamp;
+	// TODO: correct the timestamp.
+	
+	if ((ret = muxer->write_video(timestamp, codec, sample)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	return ret;
+}
+
+// @see: ngx_rtmp_mpegts_header
+u_int8_t mpegts_header[] = {
+    /* TS */
+    0x47, 0x40, 0x00, 0x10, 0x00,
+    /* PSI */
+    0x00, 0xb0, 0x0d, 0x00, 0x01, 0xc1, 0x00, 0x00,
+    /* PAT */
+    0x00, 0x01, 0xf0, 0x01,
+    /* CRC */
+    0x2e, 0x70, 0x19, 0x05,
+    /* stuffing 167 bytes */
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    
+    /* TS */
+    0x47, 0x50, 0x01, 0x10, 0x00,
+    /* PSI */
+    0x02, 0xb0, 0x17, 0x00, 0x01, 0xc1, 0x00, 0x00,
+    /* PMT */
+    0xe1, 0x00,
+    0xf0, 0x00,
+    0x1b, 0xe1, 0x00, 0xf0, 0x00, /* h264, pid=0x100=256 */
+    0x0f, 0xe1, 0x01, 0xf0, 0x00, /* aac, pid=0x101=257 */
+    /*0x03, 0xe1, 0x01, 0xf0, 0x00,*/ /* mp3 */
+    /* CRC */
+    0x2f, 0x44, 0xb9, 0x9b, /* crc for aac */
+    /*0x4e, 0x59, 0x3d, 0x1e,*/ /* crc for mp3 */
+    /* stuffing 157 bytes */
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+};
+
+// @see: NGX_RTMP_HLS_DELAY, 
+// 63000: 700ms, ts_tbn=90000
+#define SRS_HLS_DELAY 63000
+
+// @see: ngx_rtmp_SrsMpegtsFrame_t
+struct SrsMpegtsFrame
+{
+    int64_t		pts;
+    int64_t		dts;
+    int  		pid;
+    int			sid;
+    int			cc;
+    bool		key;
+    
+    SrsMpegtsFrame()
+    {
+        pts = dts = 0;
+        pid = sid = cc = 0;
+        key = false;
+    }
+};
+
+// @see: ngx_rtmp_mpegts.c
+// TODO: support full mpegts feature in future.
+class SrsMpegtsWriter
+{
+public:
+	static int write_header(int fd)
+	{
+		int ret = ERROR_SUCCESS;
+		
+		if (::write(fd, mpegts_header, sizeof(mpegts_header)) != sizeof(mpegts_header)) {
+			ret = ERROR_HLS_WRITE_FAILED;
+			srs_error("write ts file header failed. ret=%d", ret);
+			return ret;
+		}
+
+		return ret;
+	}
+	static int write_frame(int fd, SrsMpegtsFrame* frame, SrsCodecBuffer* buffer)
+	{
+		int ret = ERROR_SUCCESS;
+		
+		if (!buffer->bytes || buffer->size <= 0) {
+			return ret;
+		}
+		
+		char* last = buffer->bytes + buffer->size;
+		char* pos = buffer->bytes;
+		
+		bool first = true;
+		while (pos < last) {
+			static char packet[188];
+			char* p = packet;
+			
+			frame->cc++;
+			
+			// sync_byte; //8bits
+			*p++ = 0x47;
+			// pid; //13bits
+			*p++ = (frame->pid >> 8) & 0x1f;
+			// payload_unit_start_indicator; //1bit
+			if (first) {
+				p[-1] |= 0x40;
+			}
+			*p++ = frame->pid;
+			
+			// transport_scrambling_control; //2bits
+			// adaption_field_control; //2bits, 0x01: PayloadOnly
+			// continuity_counter; //4bits
+			*p++ = 0x10 | (frame->cc & 0x0f);
+			
+			if (first) {
+				first = false;
+				if (frame->key) {
+					p[-1] |= 0x20; // Both Adaption and Payload
+					*p++ = 7;    // size
+					*p++ = 0x50; // random access + PCR
+					p = write_pcr(p, frame->dts - SRS_HLS_DELAY);
+				}
+				
+				// PES header
+				// packet_start_code_prefix; //24bits, '00 00 01'
+				*p++ = 0x00;
+				*p++ = 0x00;
+				*p++ = 0x01;
+				//8bits
+				*p++ = frame->sid;
+				
+				// pts(33bits) need 5bytes.
+				u_int8_t header_size = 5;
+				u_int8_t flags = 0x80; // pts
+				
+				// dts(33bits) need 5bytes also
+				if (frame->dts != frame->pts) {
+					header_size += 5;
+					flags |= 0x40; // dts
+				}
+				
+				// 3bytes: flag fields from PES_packet_length to PES_header_data_length
+				int pes_size = (last - pos) + header_size + 3;
+				if (pes_size > 0xffff) {
+					/**
+					* when actual packet length > 0xffff(65535),
+					* which exceed the max u_int16_t packet length,
+					* use 0 packet length, the next unit start indicates the end of packet.
+					*/
+					pes_size = 0;
+				}
+				
+				// PES_packet_length; //16bits
+				*p++ = (pes_size >> 8);
+				*p++ = pes_size;
+				
+				// PES_scrambling_control; //2bits, '10'
+				// PES_priority; //1bit
+				// data_alignment_indicator; //1bit
+				// copyright; //1bit
+				// original_or_copy; //1bit	
+				*p++ = 0x80; /* H222 */
+				
+				// PTS_DTS_flags; //2bits
+				// ESCR_flag; //1bit
+				// ES_rate_flag; //1bit
+				// DSM_trick_mode_flag; //1bit
+				// additional_copy_info_flag; //1bit
+				// PES_CRC_flag; //1bit
+				// PES_extension_flag; //1bit
+				*p++ = flags;
+				
+				// PES_header_data_length; //8bits
+				*p++ = header_size;
+
+				// pts; // 33bits
+				p = write_pts(p, flags >> 6, frame->pts + SRS_HLS_DELAY);
+				
+				// dts; // 33bits
+				if (frame->dts != frame->pts) {
+					p = write_pts(p, 1, frame->dts + SRS_HLS_DELAY);
+				}
+			}
+			
+			int body_size = sizeof(packet) - (p - packet);
+			int in_size = last - pos;
+			
+			if (body_size <= in_size) {
+				memcpy(p, pos, body_size);
+				pos += body_size;
+			} else {
+				p = fill_stuff(p, packet, body_size, in_size);
+				memcpy(p, pos, in_size);
+				pos = last;
+			}
+			
+			// write ts packet
+			if (::write(fd, packet, sizeof(packet)) != sizeof(packet)) {
+				ret = ERROR_HLS_WRITE_FAILED;
+				srs_error("write ts file failed. ret=%d", ret);
+				return ret;
+			}
+		}
+		
+		// write success, clear and free the buffer
+		buffer->free();
+		
+		return ret;
+	}
+private:
+	static char* fill_stuff(char* pes_body_end, char* packet, int body_size, int in_size)
+	{
+		char* p = pes_body_end;
+		
+		// insert the stuff bytes before PES body
+		int stuff_size = (body_size - in_size);
+		
+		// adaption_field_control; //2bits
+		if (packet[3] & 0x20) {
+			//  has adaptation
+			// packet[4]: adaption_field_length
+			// packet[5]: adaption field data
+			// base: start of PES body
+			char* base = &packet[5] + packet[4];
+			int len = p - base;
+			p = (char*)memmove(base + stuff_size, base, len) + len;
+			// increase the adaption field size.
+			packet[4] += stuff_size;
+			
+			return p;
+		}
+
+		// create adaption field.
+		// adaption_field_control; //2bits
+		packet[3] |= 0x20;
+		// base: start of PES body
+		char* base = &packet[4];
+		int len = p - base;
+		p = (char*)memmove(base + stuff_size, base, len) + len;
+		// adaption_field_length; //8bits
+		packet[4] = (stuff_size - 1);
+		if (stuff_size >= 2) {
+			// adaption field flags.
+			packet[5] = 0;
+			// adaption data.
+			if (stuff_size > 2) {
+				memset(&packet[6], 0xff, stuff_size - 2);
+			}
+		}
+		
+		return p;
+	}
+	static char* write_pcr(char* p, int64_t pcr)
+	{
+	    *p++ = (char) (pcr >> 25);
+	    *p++ = (char) (pcr >> 17);
+	    *p++ = (char) (pcr >> 9);
+	    *p++ = (char) (pcr >> 1);
+	    *p++ = (char) (pcr << 7 | 0x7e);
+	    *p++ = 0;
+	
+	    return p;
+	}
+	static char* write_pts(char* p, u_int8_t fb, int64_t pts)
+	{
+	    int32_t val;
+	
+	    val = fb << 4 | (((pts >> 30) & 0x07) << 1) | 1;
+	    *p++ = val;
+	
+	    val = (((pts >> 15) & 0x7fff) << 1) | 1;
+	    *p++ = (val >> 8);
+	    *p++ = val;
+	
+	    val = (((pts) & 0x7fff) << 1) | 1;
+	    *p++ = (val >> 8);
+	    *p++ = val;
+	
+	    return p;
+	}
+};
+
+// the mpegts header specifed the video/audio pid.
+#define TS_VIDEO_PID 256
+#define TS_AUDIO_PID 257
+
+// ts aac stream id.
+#define TS_AUDIO_AAC 0xc0
+// ts avc stream id.
+#define TS_VIDEO_AVC 0xe0
+
+SrsTSMuxer::SrsTSMuxer()
+{
+	fd = -1;
+	
+	audio_buffer = new SrsCodecBuffer();
+	video_buffer = new SrsCodecBuffer();
+	
+	audio_frame = new SrsMpegtsFrame();
+	video_frame = new SrsMpegtsFrame();
+}
+
+SrsTSMuxer::~SrsTSMuxer()
+{
+	close();
+	
+	audio_buffer->free();
+	video_buffer->free();
+	
+	srs_freep(audio_buffer);
+	srs_freep(video_buffer);
+	
+	srs_freep(audio_frame);
+	srs_freep(video_frame);
+}
+
+int SrsTSMuxer::open(std::string _path)
+{
+	int ret = ERROR_SUCCESS;
+	
+	path = _path;
+	
+	close();
+	
+	int flags = O_CREAT|O_WRONLY|O_TRUNC;
+	mode_t mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH;
+	if ((fd = ::open(path.c_str(), flags, mode)) < 0) {
+		ret = ERROR_HLS_OPEN_FAILED;
+		srs_error("open ts file %s failed. ret=%d", path.c_str(), ret);
+		return ret;
+	}
+
+	// write mpegts header
+	if ((ret = SrsMpegtsWriter::write_header(fd)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	return ret;
+}
+
+int SrsTSMuxer::write_audio(u_int32_t time, SrsCodec* codec, SrsCodecSample* sample)
+{
+	int ret = ERROR_SUCCESS;
+	
+	if (!audio_frame) {
+		audio_frame = new SrsMpegtsFrame();
+		audio_frame->dts = audio_frame->pts = time * 90;
+		audio_frame->pid = TS_AUDIO_PID;
+		audio_frame->sid = TS_AUDIO_AAC;
+	}
+	
+	for (int i = 0; i < sample->nb_buffers; i++) {
+		SrsCodecBuffer* buf = &sample->buffers[i];
+		int32_t size = buf->size;
+		
+		if (!buf->bytes || size <= 0 || size > 0x1fff) {
+			ret = ERROR_HLS_AAC_FRAME_LENGTH;
+			srs_error("invalid aac frame length=%d, ret=%d", size, ret);
+			return ret;
+		}
+		
+		// the frame length is the AAC raw data plus the adts header size.
+		int32_t frame_length = size + 7;
+		
+		// AAC-ADTS
+		// 6.2 Audio Data Transport Stream, ADTS
+		// in aac-iso-13818-7.pdf, page 26.
+		// fixed 7bytes header
+		static u_int8_t adts_header[7] = {0xff, 0xf1, 0x00, 0x00, 0x00, 0x0f, 0xfc};
+		/*
+		// adts_fixed_header
+		// 2B, 16bits
+		int16_t syncword; //12bits, '1111 1111 1111'
+		int8_t ID; //1bit, '0'
+		int8_t layer; //2bits, '00'
+		int8_t protection_absent; //1bit, can be '1'
+		// 12bits
+		int8_t profile; //2bit, 7.1 Profiles, page 40
+		TSAacSampleFrequency sampling_frequency_index; //4bits, Table 35, page 46
+		int8_t private_bit; //1bit, can be '0'
+		int8_t channel_configuration; //3bits, Table 8
+		int8_t original_or_copy; //1bit, can be '0'
+		int8_t home; //1bit, can be '0'
+		
+		// adts_variable_header
+		// 28bits
+		int8_t copyright_identification_bit; //1bit, can be '0'
+		int8_t copyright_identification_start; //1bit, can be '0'
+		int16_t frame_length; //13bits
+		int16_t adts_buffer_fullness; //11bits, 7FF signals that the bitstream is a variable rate bitstream.
+		int8_t number_of_raw_data_blocks_in_frame; //2bits, 0 indicating 1 raw_data_block()
+		*/
+		// profile, 2bits
+		adts_header[2] = (codec->aac_profile << 6) & 0xc0;
+		// sampling_frequency_index 4bits
+		adts_header[2] |= (codec->aac_sample_rate << 2) & 0x3c;
+		// channel_configuration 3bits
+		adts_header[2] |= (codec->aac_channels >> 2) & 0x01;
+		adts_header[3] = (codec->aac_channels << 6) & 0xc0;
+		// frame_length 13bits
+		adts_header[3] |= (frame_length >> 11) & 0x03;
+		adts_header[4] = (frame_length >> 3) & 0xff;
+		adts_header[5] = ((frame_length << 5) & 0xe0);
+		// adts_buffer_fullness; //11bits
+		adts_header[5] |= 0x1f;
+
+		// copy to audio buffer
+		audio_buffer->append(adts_header, sizeof(adts_header));
+		audio_buffer->append(buf->bytes, buf->size);
+	}
+	
+	if ((ret = SrsMpegtsWriter::write_frame(fd, audio_frame, audio_buffer)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	srs_freep(audio_frame);
+	
+	return ret;
+}
+
+int SrsTSMuxer::write_video(u_int32_t time, SrsCodec* codec, SrsCodecSample* sample)
+{
+	int ret = ERROR_SUCCESS;
+	
+	video_frame->dts = time * 90;
+	video_frame->pts = video_frame->dts + sample->cts * 90;
+	video_frame->pid = TS_VIDEO_PID;
+	video_frame->sid = TS_VIDEO_AVC;
+	video_frame->key = sample->frame_type == SrsCodecVideoAVCFrameKeyFrame;
+	
+	static u_int8_t aud_nal[] = { 0x00, 0x00, 0x00, 0x01, 0x09, 0xf0 };
+	video_buffer->append(aud_nal, sizeof(aud_nal));
+	
+	bool sps_pps_sent = false;
+	for (int i = 0; i < sample->nb_buffers; i++) {
+		SrsCodecBuffer* buf = &sample->buffers[i];
+		int32_t size = buf->size;
+		
+		if (!buf->bytes || size <= 0) {
+			ret = ERROR_HLS_AVC_SAMPLE_SIZE;
+			srs_error("invalid avc sample length=%d, ret=%d", size, ret);
+			return ret;
+		}
+		
+		// 5bits, 7.3.1 NAL unit syntax, 
+		// H.264-AVC-ISO_IEC_14496-10.pdf, page 44.
+		u_int8_t nal_unit_type;
+		nal_unit_type = *buf->bytes;
+		nal_unit_type &= 0x1f;
+		
+		// Table 7-1 – NAL unit type codes, page 61
+		// 1: Coded slice
+		if (nal_unit_type == 1) {
+			sps_pps_sent = false;
+		}
+		// 5: Coded slice of an IDR picture.
+		// insert sps/pps before IDR or key frame is ok.
+		if (nal_unit_type == 5 && !sps_pps_sent) {
+		//if (video_frame->key && !sps_pps_sent) {
+			sps_pps_sent = true;
+			
+			// ngx_rtmp_hls_append_sps_pps
+			if (codec->sequenceParameterSetLength > 0) {
+				// AnnexB prefix
+				video_buffer->append(aud_nal, 4);
+				// sps
+				video_buffer->append(codec->sequenceParameterSetNALUnit, codec->sequenceParameterSetLength);
+			}
+			if (codec->pictureParameterSetLength > 0) {
+				// AnnexB prefix
+				video_buffer->append(aud_nal, 4);
+				// pps
+				video_buffer->append(codec->pictureParameterSetNALUnit, codec->pictureParameterSetLength);
+			}
+		}
+		
+		// sample start prefix, '00 00 00 01' or '00 00 01'
+		u_int8_t* p = aud_nal + 1;
+		u_int8_t* end = p + 3;
+		
+		// first AnnexB prefix is long (4 bytes)
+		if (i == 0) {
+			p = aud_nal;
+		}
+		video_buffer->append(p, end - p);
+		
+		// sample data
+		video_buffer->append(buf->bytes, buf->size);
+	}
+	
+	if ((ret = SrsMpegtsWriter::write_frame(fd, video_frame, video_buffer)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	return ret;
+}
+
+void SrsTSMuxer::close()
+{
+	if (fd > 0) {
+		::close(fd);
+		fd = -1;
+	}
+}
+