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ps.go
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package ps
import "fmt"
const (
BUF_LEN int = (1024 * 1024)
)
type H264OnlyPsMux struct {
pMuxOutBuf []byte
gb28181PsMux *Gb28181PsMux
idx int
}
func NewH264OnlyPsMux() *H264OnlyPsMux {
m := &H264OnlyPsMux{pMuxOutBuf: make([]byte, BUF_LEN), gb28181PsMux: NewGb28181PsMux()}
m.idx = m.gb28181PsMux.AddStream(PSMUX_ST_VIDEO_H264)
return m
}
func (m *H264OnlyPsMux) Mux(data []byte, pts int64) ([]byte, error) {
pMuxOutSize := 0
if err := m.gb28181PsMux.MuxH264SingleFrame(data, len(data), pts, pts, m.idx, m.pMuxOutBuf, &pMuxOutSize, BUF_LEN); err != nil {
return nil, err
}
if pMuxOutSize == 0 {
return nil, nil
}
return m.pMuxOutBuf[:pMuxOutSize], nil
}
//Gb28181PsMux class
type Gb28181PsMux struct {
m_PsMuxContext *PsMux
m_VecStream []*PsMuxStream
m_SpsPpsIBuf []byte
m_SpsPpsIBufSize int
}
func NewGb28181PsMux() *Gb28181PsMux {
return &Gb28181PsMux{m_PsMuxContext: NewPsMux(),
m_VecStream: []*PsMuxStream{},
m_SpsPpsIBuf: make([]byte, MAX_SPSPPSI_SIZE),
m_SpsPpsIBufSize: 0}
}
func (this *Gb28181PsMux) AddStream(Type uint8) int {
if this.m_PsMuxContext == nil {
this.m_PsMuxContext = NewPsMux()
}
pStream := this.m_PsMuxContext.psmux_create_stream(Type)
this.m_VecStream = append(this.m_VecStream, pStream)
return (len(this.m_VecStream) - 1)
}
//输入单个H264/5帧,必须以00 00 00 01或者00 00 01开头,SPS PPS 和 I帧不能连在一起
func (this *Gb28181PsMux) MuxH264SingleFrame(buf []byte, length int, Pts, Dts int64, Idx int,
outBuf []byte, pOutSize *int, maxOutSize int) error {
*pOutSize = 0
if Idx >= len(this.m_VecStream) {
return fmt.Errorf("Idx >= m_VecStream.size()")
}
if length < 6 {
return fmt.Errorf("MuxH264SingleFrame incomming data length < 6")
}
c := uint8(0)
if !isH264Or265Frame(buf, &c) {
return fmt.Errorf("isH264Or265Frame is false")
}
Type := getH264NALtype(c)
if Type == NAL_other {
return fmt.Errorf("NAL Type Err")
}
if Type == NAL_SEI {
return nil
}
pMuxStream := this.m_VecStream[Idx]
//default
this.m_PsMuxContext.enable_pack_hdr = false
this.m_PsMuxContext.enable_psm = false
this.m_PsMuxContext.enable_sys_hdr = false
pMuxStream.pi.flags &= ^PSMUX_PACKET_FLAG_PES_DATA_ALIGN
this.m_PsMuxContext.pts = Pts
if Pts == Dts {
Dts = INVALID_TS
}
if Type == NAL_PFRAME {
this.m_PsMuxContext.enable_pack_hdr = true
pMuxStream.pi.flags |= PSMUX_PACKET_FLAG_PES_DATA_ALIGN
if err := this.m_PsMuxContext.psmux_mux_frame(this.m_VecStream[Idx], buf, length, Pts, Dts, outBuf, pOutSize, maxOutSize); err != nil {
return err
}
} else {
//如果是单个SPS PPS 则等到I帧一起发送,原则就是同一个时间戳作为一个RTP包
if Type == NAL_SPS {
this.m_PsMuxContext.enable_pack_hdr = true
this.m_PsMuxContext.enable_psm = true
this.m_PsMuxContext.enable_sys_hdr = true
Pts = INVALID_TS
Dts = INVALID_TS
} else if Type == NAL_PPS {
Pts = INVALID_TS
Dts = INVALID_TS
} else if Type == NAL_IDR {
pMuxStream.pi.flags |= PSMUX_PACKET_FLAG_PES_DATA_ALIGN
}
outSize := 0
tmpOutBuf := this.m_SpsPpsIBuf[this.m_SpsPpsIBufSize:]
this.m_PsMuxContext.psmux_mux_frame(this.m_VecStream[Idx], buf, length, Pts, Dts, tmpOutBuf, &outSize, MAX_SPSPPSI_SIZE-this.m_SpsPpsIBufSize)
this.m_SpsPpsIBufSize += outSize
if Type == NAL_IDR {
if this.m_SpsPpsIBufSize > maxOutSize {
return fmt.Errorf("this.m_PsMuxContext.m_SpsPpsIBufSize > maxOutSize")
}
src := this.m_SpsPpsIBuf[:this.m_SpsPpsIBufSize]
copy(outBuf, src)
*pOutSize = this.m_SpsPpsIBufSize
this.m_SpsPpsIBufSize = 0
} else {
return nil
}
}
return nil
}
func isH264Or265Frame(data []byte, NalTypeChar *uint8) bool {
bOk := false
if data[0] == 0 && data[1] == 0 && data[2] == 0 && data[3] == 1 {
if NalTypeChar != nil {
*NalTypeChar = data[4];
}
bOk = true
}
if data[0] == 0 && data[1] == 0 && data[2] == 1 {
if NalTypeChar != nil {
*NalTypeChar = data[3]
}
bOk = true
}
return bOk
}
func getH264NALtype(c uint8) uint8 {
switch (c & 0x1f) {
case 6:
return NAL_SEI
case 7:
return NAL_SPS
case 8:
return NAL_PPS
case 5:
return NAL_IDR
case 1:
return NAL_PFRAME
default:
return NAL_other
}
return NAL_other
}
//bitsBuffer bits buffer
type bitsBuffer struct {
iSize int
iData int
iMask uint8
pData []byte
}
func bitsInit(isize int, buffer []byte) *bitsBuffer {
bits := &bitsBuffer{
iSize: isize,
iData: 0,
iMask: 0x80,
pData: buffer,
}
if bits.pData == nil {
bits.pData = make([]byte, isize)
}
return bits
}
func bitsWrite(bits *bitsBuffer, count int, src uint64) *bitsBuffer {
for count > 0 {
count--
if ((src >> uint(count)) & 0x01) != 0 {
bits.pData[bits.iData] |= bits.iMask
} else {
bits.pData[bits.iData] &= ^bits.iMask
}
bits.iMask >>= 1
if bits.iMask == 0 {
bits.iData++
bits.iMask = 0x80
}
}
return bits
}
func psmux_put16(pos []byte, val uint16) []byte {
pos[0] = byte((val >> 8) & 0xff)
pos[1] = byte(val & 0xff)
return pos[2:]
}
func psmux_put32(pos []byte, val uint32) []byte {
pos[0] = byte((val >> 24) & 0xff)
pos[1] = byte(val >> 16 & 0xff)
pos[2] = byte((val >> 8) & 0xff)
pos[3] = byte(val & 0xff)
return pos[4:]
}
func psmux_put_ts(pos []byte, id uint8, ts int64) []byte {
/* 1: 4 bit id value | TS [32..30] | marker_bit */
pos[0] = ((id << 4) | (uint8(ts>>29) & 0x0E) | 0x01) & 0xff
pos = pos[1:]
/* 2, 3: TS[29..15] | marker_bit */
pos = psmux_put16(pos, uint16(((ts>>14)&0xfffe)|0x01))
/* 4, 5: TS[14..0] | marker_bit */
pos = psmux_put16(pos, uint16(((ts<<1)&0xfffe)|0x01))
return pos
}
func min(a, b int64) int64 {
if a < b {
return a
}
return b
}
const (
BIT_RATE uint64 = 400 * 1024
MAX_SPSPPSI_SIZE int = (1024 * 1024)
PSMUX_PES_MAX_PAYLOAD int = 65500
PSMUX_PES_MAX_HDR_LEN int = 30
PSMUX_MAX_PACKET_LEN int = PSMUX_PES_MAX_PAYLOAD + PSMUX_PES_MAX_HDR_LEN
PSMUX_MAX_ES_INFO_LENGTH int = ((1 << 12) - 1)
MAX_MUX_STREAM_NUM int = (2)
PSMUX_START_CODE_PREFIX uint64 = 0x01
/* stream_id */
PSMUX_PACK_HEADER uint64 = 0xba
PSMUX_SYSTEM_HEADER uint64 = 0xbb
PSMUX_PROGRAM_STREAM_MAP uint64 = 0xbc
PSMUX_PRIVATE_STREAM_1 uint64 = 0xbd
PSMUX_PADDING_STREAM uint64 = 0xbe
PSMUX_PRIVATE_STREAM_2 uint64 = 0xbf
PSMUX_ECM uint64 = 0xb0
PSMUX_EMM uint64 = 0xb1
PSMUX_PROGRAM_STREAM_DIRECTORY uint64 = 0xff
PSMUX_DSMCC_STREAM uint64 = 0xf2
PSMUX_ITU_T_H222_1_TYPE_E uint64 = 0xf8
PSMUX_EXTENDED_STREAM uint64 = 0xfd
PSMUX_PROGRAM_END uint64 = 0xb9
/*StreamType*/
/*Table 2-29 in spec */
PSMUX_ST_RESERVED uint8 = 0x00
PSMUX_ST_VIDEO_MPEG1 uint8 = 0x01
PSMUX_ST_VIDEO_MPEG2 uint8 = 0x02
PSMUX_ST_AUDIO_MPEG1 uint8 = 0x03
PSMUX_ST_AUDIO_MPEG2 uint8 = 0x04
PSMUX_ST_PRIVATE_SECTIONS uint8 = 0x05
PSMUX_ST_PRIVATE_DATA uint8 = 0x06
PSMUX_ST_MHEG uint8 = 0x07
PSMUX_ST_DSMCC uint8 = 0x08
PSMUX_ST_H222_1 uint8 = 0x09
/* later extensions */
PSMUX_ST_AUDIO_AAC uint8 = 0x0f
PSMUX_ST_VIDEO_MPEG4 uint8 = 0x10
PSMUX_ST_VIDEO_H264 uint8 = 0x1b
/* private stream types */
PSMUX_ST_PS_AUDIO_AC3 uint8 = 0x81
PSMUX_ST_PS_AUDIO_DTS uint8 = 0x8a
PSMUX_ST_PS_AUDIO_LPCM uint8 = 0x8b
PSMUX_ST_PS_AUDIO_G711A uint8 = 0x90
PSMUX_ST_PS_AUDIO_G711U uint8 = 0x91
PSMUX_ST_PS_AUDIO_G722_1 uint8 = 0x92
PSMUX_ST_PS_AUDIO_G723_1 uint8 = 0x93
PSMUX_ST_PS_AUDIO_G729 uint8 = 0x99
PSMUX_ST_PS_AUDIO_SVAC uint8 = 0x9b
PSMUX_ST_PS_DVD_SUBPICTURE uint8 = 0xff
/* Non-standard definitions */
PSMUX_ST_VIDEO_DIRAC uint8 = 0xD1
/* TODO: flags? looks that we don't need these */
PSMUX_PACKET_FLAG_NONE uint32 = (0)
PSMUX_PACKET_FLAG_ADAPTATION uint32 = (1 << 0)
PSMUX_PACKET_FLAG_DISCONT uint32 = (1 << 1)
PSMUX_PACKET_FLAG_RANDOM_ACCESS uint32 = (1 << 2)
PSMUX_PACKET_FLAG_PRIORITY uint32 = (1 << 3)
PSMUX_PACKET_FLAG_WRITE_PCR uint32 = (1 << 4)
PSMUX_PACKET_FLAG_WRITE_OPCR uint32 = (1 << 5)
PSMUX_PACKET_FLAG_WRITE_SPLICE uint32 = (1 << 6)
PSMUX_PACKET_FLAG_WRITE_ADAPT_EXT uint32 = (1 << 7)
/* PES stream specific flags */
PSMUX_PACKET_FLAG_PES_FULL_HEADER uint32 = (1 << 8)
PSMUX_PACKET_FLAG_PES_WRITE_PTS uint32 = (1 << 9)
PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS uint32 = (1 << 10)
PSMUX_PACKET_FLAG_PES_WRITE_ESCR uint32 = (1 << 11)
PSMUX_PACKET_FLAG_PES_EXT_STREAMID uint32 = (1 << 12)
PSMUX_PACKET_FLAG_PES_DATA_ALIGN uint32 = (1 << 13)
INVALID_TS int64 = (-1)
/* NAL_type */
NAL_IDR uint8 = 0
NAL_SPS uint8 = 1
NAL_PPS uint8 = 2
NAL_SEI uint8 = 3
NAL_PFRAME uint8 = 4
NAL_VPS uint8 = 5
NAL_SEI_PREFIX uint8 = 6
NAL_SEI_SUFFIX uint8 = 7
NAL_other uint8 = 8
NAL_TYPE_NUM uint8 = 9
CLOCKBASE float64 = 90000
PSMUX_PACK_HDR_INTERVAL float64 = (0.7 * CLOCKBASE) /* interval to update pack header. 0.7 sec */
PSMUX_BITRATE_CALC_INTERVAL float64 = CLOCKBASE /* interval to update bitrate in pack header. 1 sec */
/* stream_id assignemnt */
PSMUX_STREAM_ID_MPGA_INIT uint8 = 0xc0
PSMUX_STREAM_ID_MPGA_MAX uint8 = 0xcf
PSMUX_STREAM_ID_MPGV_INIT uint8 = 0xe0
PSMUX_STREAM_ID_MPGV_MAX uint8 = 0xef
PSMUX_STREAM_ID_AC3_INIT uint8 = 0x80
PSMUX_STREAM_ID_AC3_MAX uint8 = 0x87
PSMUX_STREAM_ID_SPU_INIT uint8 = 0x20
PSMUX_STREAM_ID_SPU_MAX uint8 = 0x3f
PSMUX_STREAM_ID_DTS_INIT uint8 = 0x88
PSMUX_STREAM_ID_DTS_MAX uint8 = 0x8f
PSMUX_STREAM_ID_LPCM_INIT uint8 = 0xa0
PSMUX_STREAM_ID_LPCM_MAX uint8 = 0xaf
PSMUX_STREAM_ID_DIRAC_INIT uint8 = 0x60
PSMUX_STREAM_ID_DIRAC_MAX uint8 = 0x6f
)
//PsMux class
type PsMux struct {
streams []*PsMuxStream
id_info PsMuxStreamIdInfo
pts int64
bitRate uint64
/* bounds in system header */
audioBound uint8
videoBound uint8
rateBound uint64
packetBuf []byte
esInfoBuf []byte
enable_pack_hdr bool
pack_hdr_pts int64
enable_sys_hdr bool
sys_hdr_pts int64
enable_psm bool
psm_pts int64
pes_cnt uint32
bit_size uint64 /* accumulated bit size of processed data */
bit_pts int64 /* last time the bit_rate is updated */
}
type PsMuxStreamIdInfo struct {
id_mpga uint8
id_mpgv uint8
id_ac3 uint8
id_spu uint8
id_dts uint8
id_lpcm uint8
id_dirac uint8
}
func NewPsMux() *PsMux {
return &PsMux{packetBuf: make([]byte, PSMUX_MAX_PACKET_LEN),
esInfoBuf: make([]byte, PSMUX_MAX_ES_INFO_LENGTH),
streams: []*PsMuxStream{},
pts: INVALID_TS,
pack_hdr_pts: INVALID_TS,
sys_hdr_pts: INVALID_TS,
psm_pts: INVALID_TS,
bit_pts: 0,
bitRate: BIT_RATE,
rateBound: (2 * BIT_RATE) / 400,
videoBound: 0,
audioBound: 0,
id_info: PsMuxStreamIdInfo{id_mpga: PSMUX_STREAM_ID_MPGA_INIT,
id_mpgv: PSMUX_STREAM_ID_MPGV_INIT,
id_ac3: PSMUX_STREAM_ID_AC3_INIT,
id_spu: PSMUX_STREAM_ID_SPU_INIT,
id_dts: PSMUX_STREAM_ID_DTS_INIT,
id_lpcm: PSMUX_STREAM_ID_LPCM_INIT,
id_dirac: PSMUX_STREAM_ID_DIRAC_INIT}}
}
func (mux *PsMux) psmux_create_stream(stream_type uint8) *PsMuxStream {
if len(mux.streams) >= MAX_MUX_STREAM_NUM {
return nil
}
stream := NewPsmuxStream(mux, stream_type)
mux.streams = append(mux.streams, stream)
if stream.isVideoStream {
mux.videoBound++;
if mux.videoBound > 32 {
fmt.Printf("Number of video es exceeds upper limit")
}
} else if (stream.isAudioStream) {
mux.audioBound++;
if (mux.audioBound > 64) {
fmt.Printf("Number of audio es exceeds upper limit")
}
}
return stream;
}
func (mux *PsMux) psmux_mux_frame(stream *PsMuxStream, rawBuf []byte, rawBuflen int, pts, dts int64,
pOutBuf []byte, pOutSize *int, maxOutSize int) error {
if stream == nil || rawBuf == nil || rawBuflen == 0 || pOutBuf == nil || maxOutSize == 0 {
return fmt.Errorf("bad parameter")
}
{
ts := stream.psmux_stream_get_pts();
if ts != INVALID_TS {
mux.pts = ts;
}
}
*pOutSize = 0
if mux.enable_pack_hdr {
if (mux.pts != INVALID_TS && mux.pts > mux.bit_pts && mux.pts-mux.bit_pts > int64(PSMUX_BITRATE_CALC_INTERVAL)) {
/* XXX: smoothing the rate? */
mux.bitRate = uint64((float64(mux.bit_size) * 8 * CLOCKBASE) / float64(mux.pts-mux.bit_pts))
mux.bit_size = 0
mux.bit_pts = mux.pts
}
muxHdrSize := 0
if err := mux.psmux_write_pack_header(pOutBuf, &muxHdrSize, maxOutSize); err != nil {
return err
}
maxOutSize -= muxHdrSize
*pOutSize += muxHdrSize
pOutBuf = pOutBuf[muxHdrSize:]
mux.pack_hdr_pts = mux.pts
}
if mux.enable_sys_hdr {
muxSysHdrSize := 0
if err := mux.psmux_write_system_header(pOutBuf, &muxSysHdrSize, maxOutSize); err != nil {
return err
}
maxOutSize -= muxSysHdrSize
*pOutSize += muxSysHdrSize
pOutBuf = pOutBuf[muxSysHdrSize:]
mux.sys_hdr_pts = mux.pts
}
if mux.enable_psm {
muxPsmSize := 0
if err := mux.psmux_write_program_stream_map(pOutBuf, &muxPsmSize, maxOutSize); err != nil {
return err
}
maxOutSize -= muxPsmSize
*pOutSize += muxPsmSize
pOutBuf = pOutBuf[muxPsmSize:]
mux.psm_pts = mux.pts
}
PesSize := 0
if err := stream.psmux_stream_mux_frame(rawBuf, rawBuflen, pts, dts, pOutBuf, &PesSize, maxOutSize); err != nil {
return err
}
*pOutSize += PesSize;
mux.pes_cnt += 1
return nil
}
func (mux *PsMux) psmux_write_pack_header(outBuf []byte, pOutSize *int, maxOutSize int) error {
scr := mux.pts /* XXX: is this correct? necessary to put any offset? */
if mux.pts == -1 {
scr = 0
}
/* pack_start_code */
bw := bitsInit(14, mux.packetBuf)
bitsWrite(bw, 24, PSMUX_START_CODE_PREFIX)
bitsWrite(bw, 8, PSMUX_PACK_HEADER)
/* scr */
bitsWrite(bw, 2, 0x1)
bitsWrite(bw, 3, uint64(scr>>30)&0x07)
bitsWrite(bw, 1, 1)
bitsWrite(bw, 15, uint64(scr>>15)&0x7fff)
bitsWrite(bw, 1, 1)
bitsWrite(bw, 15, uint64(scr)&0x7fff)
bitsWrite(bw, 1, 1)
bitsWrite(bw, 9, 0) /* system_clock_reference_extension: set to 0 (like what VLC does) */
bitsWrite(bw, 1, 1)
{
/* Scale to get the muxRate, rounding up */
muxRate := (mux.bitRate + 8*50 - 1) / (8 * 50)
//gst_util_uint64_scale (mux->bitRate + 8 * 50 - 1, 1, 8 * 50);
if (muxRate > mux.rateBound/2) {
mux.rateBound = muxRate * 2
}
bitsWrite(bw, 22, muxRate) /* program_mux_rate */
bitsWrite(bw, 2, 3)
}
bitsWrite(bw, 5, 0x1f)
bitsWrite(bw, 3, 0) /* pack_stuffing_length */
if maxOutSize < 14 {
return fmt.Errorf("maxOutSize < 14")
}
data := bw.pData[:14]
copy(outBuf, data)
if pOutSize != nil {
*pOutSize = 14
}
return nil
}
func (mux *PsMux) psmux_write_system_header(outBuf []byte, pOutSize *int, maxOutSize int) error {
len := 12 + len(mux.streams)*3
/* system_header_start_code */
bw := bitsInit(len, mux.packetBuf)
/* system_header start code */
bitsWrite(bw, 24, PSMUX_START_CODE_PREFIX)
bitsWrite(bw, 8, PSMUX_SYSTEM_HEADER)
bitsWrite(bw, 16, uint64(len-6)) /* header_length */
bitsWrite(bw, 1, 1) /* marker */
bitsWrite(bw, 22, mux.rateBound) /* rate_bound */
bitsWrite(bw, 1, 1) /* marker */
bitsWrite(bw, 6, uint64(mux.audioBound)) /* audio_bound */
bitsWrite(bw, 1, 0) /* fixed_flag */
bitsWrite(bw, 1, 0) /* CSPS_flag */
bitsWrite(bw, 1, 0) /* system_audio_lock_flag */
bitsWrite(bw, 1, 0) /* system_video_lock_flag */
bitsWrite(bw, 1, 1) /* marker */
bitsWrite(bw, 5, uint64(mux.videoBound)) /* video_bound */
bitsWrite(bw, 1, 0) /* packet_rate_restriction_flag */
bitsWrite(bw, 7, 0x7f) /* reserved_bits */
for _, stream := range mux.streams {
bitsWrite(bw, 8, uint64(stream.streamID)) /* stream_id */
bitsWrite(bw, 2, 0x3) /* reserved */
v := 0
d := 128
if stream.isVideoStream {
v = 1
d = 1024
}
bitsWrite(bw, 1, uint64(v)) /* buffer_bound_scale */
bitsWrite(bw, 13, stream.maxBufferSize/uint64(d)) /* buffer_size_bound */
}
if maxOutSize < len {
return fmt.Errorf("maxOutSize < %d", len)
}
data := bw.pData[:len]
copy(outBuf, data)
if pOutSize != nil {
*pOutSize = len
}
return nil
}
func (mux *PsMux) psmux_write_program_stream_map(outBuf []byte, pOutSize *int, maxOutSize int) error {
psm_size := 16
es_map_size := 0
len := 0
/* pre-write the descriptor loop */
pos := mux.esInfoBuf
for _, stream := range mux.streams {
len = 0
pos[0] = stream.streamType
pos[1] = stream.streamID
pos = pos[2:]
stream.psmux_stream_get_es_descrs(pos[2:], &len)
pos = psmux_put16(pos, uint16(len))
es_map_size += len + 4
pos = pos[len:]
}
psm_size += es_map_size
bw := bitsInit(psm_size, mux.packetBuf)
/* psm start code */
bitsWrite(bw, 24, PSMUX_START_CODE_PREFIX)
bitsWrite(bw, 8, PSMUX_PROGRAM_STREAM_MAP)
bitsWrite(bw, 16, uint64(psm_size-6)) /* psm_length */
bitsWrite(bw, 1, 1) /* current_next_indicator */
bitsWrite(bw, 2, 0xF) /* reserved */
bitsWrite(bw, 5, 0x1) /* psm_version = 1 */
bitsWrite(bw, 7, 0xFF) /* reserved */
bitsWrite(bw, 1, 1) /* marker */
bitsWrite(bw, 16, 0) /* program_stream_info_length */
/* program_stream_info empty */
bitsWrite(bw, 16, uint64(es_map_size)) /* elementary_stream_map_length */
dst := bw.pData[bw.iData:]
src := mux.esInfoBuf[:es_map_size]
copy(dst, src)
/* CRC32 */
{
crc := calc_crc32(mux.packetBuf[:psm_size-4])
pos := mux.packetBuf[psm_size-4:]
pos = psmux_put32(pos, crc);
}
if maxOutSize < psm_size {
return fmt.Errorf("maxOutSize < %d", psm_size)
}
data := bw.pData[:psm_size]
copy(outBuf, data)
if pOutSize != nil {
*pOutSize = psm_size
}
return nil
}
//PsMuxStream class
type PsMuxStream struct {
pi PsMuxPacketInfo
streamType uint8
streamID uint8
stream_id_ext uint8
/* PES payload */
cur_pes_payload_size uint16
pes_bytes_written uint16 /* delete*/
/* stream type */
isVideoStream bool
isAudioStream bool
/* PTS/DTS to write if the flags in the packet info are set */
pts int64 /* TODO: cur_buffer->pts?*/
dts int64 /* TODO: cur_buffer->dts?*/
last_pts int64
/* for writing descriptors */
audioSampling int
audioChannels int
audioBitrate int
/* for writing buffer size in system header */
maxBufferSize uint64
}
type PsMuxPacketInfo struct {
flags uint32
}
func NewPsmuxStream(mux *PsMux, stream_type uint8) *PsMuxStream {
info := &(mux.id_info)
stream := &PsMuxStream{
streamType: stream_type,
isAudioStream: false,
isVideoStream: false,
streamID: 0,
maxBufferSize: 0,
}
switch (stream_type) {
/* MPEG AUDIO */
case PSMUX_ST_PS_AUDIO_G711A:
case PSMUX_ST_AUDIO_MPEG1:
case PSMUX_ST_AUDIO_MPEG2:
stream.maxBufferSize = 2484; /* ISO/IEC 13818 2.5.2.4 */
case PSMUX_ST_AUDIO_AAC:
if info.id_mpga > PSMUX_STREAM_ID_MPGA_MAX {
break
}
stream.streamID = info.id_mpga
info.id_mpga++
stream.stream_id_ext = 0
stream.isAudioStream = true
break
/* MPEG VIDEO */
case PSMUX_ST_VIDEO_MPEG1:
case PSMUX_ST_VIDEO_MPEG2:
case PSMUX_ST_VIDEO_MPEG4:
case PSMUX_ST_VIDEO_H264:
if info.id_mpgv > PSMUX_STREAM_ID_MPGV_MAX {
break
}
stream.streamID = info.id_mpgv
info.id_mpgv++
stream.stream_id_ext = 0
stream.isVideoStream = true
break
/* AC3 / A52 */
case PSMUX_ST_PS_AUDIO_AC3:
if info.id_ac3 > PSMUX_STREAM_ID_AC3_MAX {
break
}
stream.streamID = uint8(PSMUX_PRIVATE_STREAM_1)
stream.stream_id_ext = info.id_ac3
info.id_ac3++
stream.isAudioStream = true
/* AC3 requires data alignment */
stream.pi.flags |= PSMUX_PACKET_FLAG_PES_DATA_ALIGN
break
/* DTS */
case PSMUX_ST_PS_AUDIO_DTS:
if info.id_dts > PSMUX_STREAM_ID_DTS_MAX {
break
}
stream.streamID = uint8(PSMUX_PRIVATE_STREAM_1)
stream.stream_id_ext = info.id_dts
info.id_dts++
stream.isAudioStream = true
break
/* LPCM */
case PSMUX_ST_PS_AUDIO_LPCM:
if info.id_lpcm > PSMUX_STREAM_ID_LPCM_MAX {
break
}
stream.streamID = uint8(PSMUX_PRIVATE_STREAM_1)
stream.stream_id_ext = info.id_lpcm
info.id_lpcm++
stream.isAudioStream = true
break
case PSMUX_ST_VIDEO_DIRAC:
if info.id_dirac > PSMUX_STREAM_ID_DIRAC_MAX {
break
}
stream.streamID = uint8(PSMUX_EXTENDED_STREAM)
stream.stream_id_ext = info.id_dirac
info.id_dirac++
stream.isVideoStream = true
break
default:
fmt.Printf("Stream type 0x%0x not yet implemented", stream_type);
break
}
if stream.streamID == 0 {
fmt.Printf("Number of elementary streams of type %04x exceeds maximum",
stream.streamType)
return nil
}
/* XXX: Are private streams also using stream_id_ext? */
if stream.streamID == uint8(PSMUX_EXTENDED_STREAM) {
stream.pi.flags |= PSMUX_PACKET_FLAG_PES_EXT_STREAMID
}
/* Are these useful at all? */
if (stream.streamID == uint8(PSMUX_PROGRAM_STREAM_MAP) ||
stream.streamID == uint8(PSMUX_PADDING_STREAM) ||
stream.streamID == uint8(PSMUX_PRIVATE_STREAM_2) ||
stream.streamID == uint8(PSMUX_ECM) ||
stream.streamID == uint8(PSMUX_EMM) ||
stream.streamID == uint8(PSMUX_PROGRAM_STREAM_DIRECTORY) ||
stream.streamID == uint8(PSMUX_DSMCC_STREAM) ||
stream.streamID == uint8(PSMUX_ITU_T_H222_1_TYPE_E)) {
stream.pi.flags &= ^PSMUX_PACKET_FLAG_PES_FULL_HEADER
} else {
stream.pi.flags |= PSMUX_PACKET_FLAG_PES_FULL_HEADER
}
//stream.cur_buffer = NULL;
//stream.cur_buffer_consumed = 0;
stream.cur_pes_payload_size = 0;
//stream.buffer_release = NULL;
stream.pts = INVALID_TS;
stream.dts = INVALID_TS;
stream.last_pts = INVALID_TS;
/* These fields are set by gstreamer */
stream.audioSampling = 0;
stream.audioChannels = 0;
stream.audioBitrate = 0;
if (stream.maxBufferSize == 0) {
/* XXX: VLC'S VALUE. Better default? */
if stream.isVideoStream {
stream.maxBufferSize = 400 * 1024
} else if stream.isAudioStream {
stream.maxBufferSize = 4 * 1024
} else { /* Unknown */
stream.maxBufferSize = 4 * 1024
}
}
return stream;
}
func (stream *PsMuxStream) psmux_stream_mux_frame(
rawBuf []byte, rawBuflen int, pts, dts int64,
pOutBuf []byte, pOutSize *int, maxOutSize int) error {
if rawBuf == nil || maxOutSize < PSMUX_PES_MAX_HDR_LEN {
return fmt.Errorf("bad parameter")
}
stream.pts = pts
stream.dts = dts
*pOutSize = 0
/* clear pts/dts flag */
stream.pi.flags &= ^(PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS |
PSMUX_PACKET_FLAG_PES_WRITE_PTS)
/* update pts/dts flag */
if (stream.pts != int64(INVALID_TS) && stream.dts != int64(INVALID_TS)) {
stream.pi.flags |= PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS;
} else {
if (stream.pts != int64(INVALID_TS)) {
stream.pi.flags |= PSMUX_PACKET_FLAG_PES_WRITE_PTS;
}
}
pes_hdr_length := stream.psmux_stream_pes_header_length()
len := rawBuflen
cur := rawBuf
for len > 0 {
stream.cur_pes_payload_size =
uint16(min(int64(len), int64(PSMUX_PES_MAX_PAYLOAD-int(pes_hdr_length))))
if maxOutSize < int(pes_hdr_length) {
return fmt.Errorf("OutBuf space is not enough")
}
stream.psmux_stream_write_pes_header(pOutBuf)
maxOutSize -= int(pes_hdr_length)
pOutBuf = pOutBuf[pes_hdr_length:]
if (maxOutSize < int(stream.cur_pes_payload_size)) {
return fmt.Errorf("OutBuf space is not enough")
}
src := cur[:stream.cur_pes_payload_size]
copy(pOutBuf, src)
cur = cur[stream.cur_pes_payload_size:]
len -= int(stream.cur_pes_payload_size) /* number of bytes of payload to write */
pOutBuf = pOutBuf[stream.cur_pes_payload_size:]
maxOutSize -= int(stream.cur_pes_payload_size)
*pOutSize += int(int(pes_hdr_length) + int(stream.cur_pes_payload_size))
}
return nil
}
func (stream *PsMuxStream) psmux_stream_pes_header_length() uint8 {
/* Calculate the length of the header for this stream */
/* start_code prefix + stream_id + pes_packet_length = 6 bytes */
packet_len := 6
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_FULL_HEADER) != 0 {
/* For a PES 'full header' we have at least 3 more bytes,
* and then more based on flags */
packet_len += 3
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS) != 0 {
packet_len += 10
} else if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS) != 0 {
packet_len += 5
}
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_EXT_STREAMID) != 0 {
/* Need basic extension flags (1 byte), plus 2 more bytes for the
* length + extended stream id */
packet_len += 3
}
}
return uint8(packet_len)
}
func (stream *PsMuxStream) psmux_stream_write_pes_header(data []byte) {
hdr_len := stream.psmux_stream_pes_header_length()
/* start_code prefix + stream_id + pes_packet_length = 6 bytes */
data[0] = 0x00
data[1] = 0x00
data[2] = 0x01
data[3] = byte(stream.streamID)
data = data[4:]
length_to_write := uint16(hdr_len) - 6 + stream.cur_pes_payload_size
data = psmux_put16(data, length_to_write);
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_FULL_HEADER) != 0 {
/* Not scrambled, original, not-copyrighted, data_alignment specified by flag */
flags := uint8(0x88)
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_DATA_ALIGN) != 0 {
flags |= 0x04; /* Enable data_alignment_indicator */
}
data[0] = flags
data = data[1:]
/* Flags */
flags = 0;
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS) != 0 {
flags |= 0xC0
} else if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS) != 0 {
flags |= 0x80;
}
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_EXT_STREAMID) != 0 {
flags |= 0x01; /* Enable PES_extension_flag */
}
data[0] = flags
data = data[1:]
/* Header length is the total pes length,
* minus the 9 bytes of start codes, flags + hdr_len */
if hdr_len < 9 {
return
}
data[0] = (hdr_len - 9)
data = data[1:]
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS) != 0 {
data = psmux_put_ts(data, 0x3, stream.pts);
data = psmux_put_ts(data, 0x1, stream.dts);
} else if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS) != 0 {
data = psmux_put_ts(data, 0x2, stream.pts);
}
if (stream.pi.flags & PSMUX_PACKET_FLAG_PES_EXT_STREAMID) != 0 {
flags = 0x0f; /* preceeding flags all 0 | (reserved bits) | PES_extension_flag_2 */
data[0] = flags
ext_len := uint8(1); /* Only writing 1 byte into the extended fields */
data[1] = 0x80 | ext_len; /* marker | PES_extension_field_length */
data[2] = 0x80 | stream.stream_id_ext; /* stream_id_extension_flag | extended_stream_id */
data = data[3:]
}
}
}
func (stream *PsMuxStream) psmux_stream_get_es_descrs(buf []byte, len *int) {
if buf == nil || len == nil {
if (len != nil) {
*len = 0
}
return
}
*len = 0
/* Based on the stream type, write out any descriptors to go in the
* PMT ES_info field */
pos := buf
/* tag (registration_descriptor), length, format_identifier */
switch (stream.streamType) {
case PSMUX_ST_AUDIO_AAC:
/* FIXME */
break;
case PSMUX_ST_VIDEO_MPEG4:
/* FIXME */
break;
case PSMUX_ST_VIDEO_H264:
pos[0] = 0x05;
pos[1] = 8;
pos[2] = 0x48; /* 'H' */
pos[3] = 0x44; /* 'D' */
pos[4] = 0x4D; /* 'M' */
pos[5] = 0x56; /* 'V' */
/* FIXME : Not sure about this additional_identification_info */
pos[6] = 0xFF;
pos[7] = 0x1B;
pos[8] = 0x44;
pos[9] = 0x3F;
pos = pos[10:]
*len += 10
break;