mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-19 08:11:16 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst-libs/ext/mplex/systems.cc
David Schleef 2f0cc8ec30 Moved from gst-plugins/ext/mplex/. See that directory for older changelogs. 
Original commit message from CVS:
Moved from gst-plugins/ext/mplex/.  See that directory for older
changelogs.
2003-07-26 03:01:58 +00:00

762 lines
24 KiB
C++
Raw Blame History

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/stat.h>
#include "systems.hh"
#include "mplexconsts.hh"
#include <cassert>
uint8_t dummy_buf[8000];
void
PS_Stream::Init (unsigned _mpeg, unsigned int _sector_size, off_t max_seg_size)
{
max_segment_size = max_seg_size;
mpeg_version = _mpeg;
sector_size = _sector_size;
segment_num = 1;
written = 0;
sector_buf = new uint8_t[_sector_size];
}
bool PS_Stream::FileLimReached ()
{
return max_segment_size != 0 && written > max_segment_size;
}
void
PS_Stream::NextFile ()
{
/*
char prev_filename[strlen (cur_filename) + 1];
//fclose (strm);
++segment_num;
strcpy (prev_filename, cur_filename);
snprintf (cur_filename, MAXPATHLEN, filename_pat, segment_num);
if (strcmp (prev_filename, cur_filename) == 0) {
mjpeg_error_exit1
("Need to split output but there appears to be no %%d in the filename pattern %s",
filename_pat);
}
strm = fopen (cur_filename, "wb");
if (strm == NULL) {
mjpeg_error_exit1 ("Could not open for writing: %s", cur_filename);
}
*/
}
/**************************************************************
Packet payload compute how much payload a sector-sized packet with the
specified headers can carry...
TODO: Should really be called "Sector Payload"
**************************************************************/
unsigned int
PS_Stream::PacketPayload (MuxStream & strm,
Sys_header_struc * sys_header,
Pack_struc * pack_header, int buffers, int PTSstamp, int DTSstamp)
{
int payload = sector_size - (PACKET_HEADER_SIZE + strm.zero_stuffing);
if (sys_header != NULL)
payload -= sys_header->length;
if (mpeg_version == 2) {
if (buffers)
payload -= MPEG2_BUFFERINFO_LENGTH;
payload -= MPEG2_AFTER_PACKET_LENGTH_MIN;
if (pack_header != NULL)
payload -= pack_header->length;
if (DTSstamp)
payload -= DTS_PTS_TIMESTAMP_LENGTH;
if (PTSstamp)
payload -= DTS_PTS_TIMESTAMP_LENGTH;
} else {
if (buffers)
payload -= MPEG1_BUFFERINFO_LENGTH;
payload -= MPEG1_AFTER_PACKET_LENGTH_MIN;
if (pack_header != NULL)
payload -= pack_header->length;
if (DTSstamp)
payload -= DTS_PTS_TIMESTAMP_LENGTH;
if (PTSstamp)
payload -= DTS_PTS_TIMESTAMP_LENGTH;
if (DTSstamp || PTSstamp)
payload += 1; /* No need for nostamp marker ... */
}
return payload;
}
/*************************************************************************
Kopiert einen TimeCode in einen Bytebuffer. Dabei wird er nach
MPEG-Verfahren in bits aufgesplittet.
Makes a Copy of a TimeCode in a Buffer, splitting it into bitfields
for MPEG-1/2 DTS/PTS fields and MPEG-1 pack scr fields
*************************************************************************/
void
PS_Stream::BufferDtsPtsMpeg1ScrTimecode (clockticks timecode, uint8_t marker, uint8_t ** buffer)
{
clockticks thetime_base;
uint8_t temp;
unsigned int msb, lsb;
/* MPEG-1 uses a 90KHz clock, extended to 300*90KHz = 27Mhz in MPEG-2 */
/* For these fields we only encode to MPEG-1 90Khz resolution... */
thetime_base = timecode / 300;
msb = (thetime_base >> 32) & 1;
lsb = (thetime_base & 0xFFFFFFFFLL);
temp = (marker << 4) | (msb << 3) | ((lsb >> 29) & 0x6) | 1;
*((*buffer)++) = temp;
temp = (lsb & 0x3fc00000) >> 22;
*((*buffer)++) = temp;
temp = ((lsb & 0x003f8000) >> 14) | 1;
*((*buffer)++) = temp;
temp = (lsb & 0x7f80) >> 7;
*((*buffer)++) = temp;
temp = ((lsb & 0x007f) << 1) | 1;
*((*buffer)++) = temp;
}
/*************************************************************************
Makes a Copy of a TimeCode in a Buffer, splitting it into bitfields
for MPEG-2 pack scr fields which use the full 27Mhz resolution
Did they *really* need to put a 27Mhz
clock source into the system stream. Does anyone really need it
for their decoders? Get real... I guess they thought it might allow
someone somewhere to save on a proper clock circuit.
*************************************************************************/
void
PS_Stream::BufferMpeg2ScrTimecode (clockticks timecode, uint8_t ** buffer)
{
clockticks thetime_base;
unsigned int thetime_ext;
uint8_t temp;
unsigned int msb, lsb;
thetime_base = timecode / 300;
thetime_ext = timecode % 300;
msb = (thetime_base >> 32) & 1;
lsb = thetime_base & 0xFFFFFFFFLL;
temp = (MARKER_MPEG2_SCR << 6) | (msb << 5) | ((lsb >> 27) & 0x18) | 0x4 | ((lsb >> 28) & 0x3);
*((*buffer)++) = temp;
temp = (lsb & 0x0ff00000) >> 20;
*((*buffer)++) = temp;
temp = ((lsb & 0x000f8000) >> 12) | 0x4 | ((lsb & 0x00006000) >> 13);
*((*buffer)++) = temp;
temp = (lsb & 0x00001fe0) >> 5;
*((*buffer)++) = temp;
temp = ((lsb & 0x0000001f) << 3) | 0x4 | ((thetime_ext & 0x00000180) >> 7);
*((*buffer)++) = temp;
temp = ((thetime_ext & 0x0000007F) << 1) | 1;
*((*buffer)++) = temp;
}
/*************************************************************************
BufferPaddingPacket - Insert a padding packet of the desired length
into the specified Program/System stream buffer
**************************************************************************/
void
PS_Stream::BufferPaddingPacket (int padding, uint8_t * &buffer)
{
uint8_t *index = buffer;
int i;
assert ((mpeg_version == 2 && padding >= 6) || (mpeg_version == 1 && padding >= 7));
*(index++) = static_cast < uint8_t > (PACKET_START) >> 16;
*(index++) = static_cast < uint8_t > (PACKET_START & 0x00ffff) >> 8;
*(index++) = static_cast < uint8_t > (PACKET_START & 0x0000ff);
*(index++) = PADDING_STR;
*(index++) = static_cast < uint8_t > ((padding - 6) >> 8);
*(index++) = static_cast < uint8_t > ((padding - 6) & 0xff);
if (mpeg_version == 2) {
for (i = 0; i < padding - 6; i++)
*(index++) = static_cast < uint8_t > (STUFFING_BYTE);
} else {
*(index++) = 0x0F;
for (i = 0; i < padding - 7; i++)
*(index++) = static_cast < uint8_t > (STUFFING_BYTE);
}
buffer = index;
}
void
PS_Stream::BufferSectorHeader (uint8_t * index,
Pack_struc * pack,
Sys_header_struc * sys_header, uint8_t * &header_end)
{
/* Pack header if present */
if (pack != NULL) {
memcpy (index, pack->buf, pack->length);
index += pack->length;
}
/* System header if present */
if (sys_header != NULL) {
memcpy (index, sys_header->buf, sys_header->length);
index += sys_header->length;
}
header_end = index;
}
/******************************************
*
* BufferPacketHeader
* Construct and MPEG-1/2 header for a packet in the specified
* buffer (which *MUST* be long enough) and set points to the start of
* the payload and packet length fields.
*
******************************************/
void
PS_Stream::BufferPacketHeader (uint8_t * buf,
uint8_t type,
unsigned int mpeg_version,
bool buffers,
unsigned int buffer_size,
uint8_t buffer_scale,
clockticks PTS,
clockticks DTS,
uint8_t timestamps, uint8_t * &size_field, uint8_t * &header_end)
{
uint8_t *index = buf;
uint8_t *pes_header_len_field = 0;
/* konstante Packet Headerwerte eintragen */
/* write constant packet header data */
*(index++) = static_cast < uint8_t > (PACKET_START) >> 16;
*(index++) = static_cast < uint8_t > (PACKET_START & 0x00ffff) >> 8;
*(index++) = static_cast < uint8_t > (PACKET_START & 0x0000ff);
*(index++) = type;
/* we remember this offset so we can fill in the packet size field once
we know the actual size... */
size_field = index;
index += 2;
if (mpeg_version == 1) {
/* MPEG-1: buffer information */
if (buffers) {
*(index++) = static_cast < uint8_t > (0x40 | (buffer_scale << 5) | (buffer_size >> 8));
*(index++) = static_cast < uint8_t > (buffer_size & 0xff);
}
/* MPEG-1: PTS, PTS & DTS, oder gar nichts? */
/* should we write PTS, PTS & DTS or nothing at all ? */
switch (timestamps) {
case TIMESTAMPBITS_NO:
*(index++) = MARKER_NO_TIMESTAMPS;
break;
case TIMESTAMPBITS_PTS:
BufferDtsPtsMpeg1ScrTimecode (PTS, MARKER_JUST_PTS, &index);
break;
case TIMESTAMPBITS_PTS_DTS:
BufferDtsPtsMpeg1ScrTimecode (PTS, MARKER_PTS, &index);
BufferDtsPtsMpeg1ScrTimecode (DTS, MARKER_DTS, &index);
break;
}
} else if (type != PADDING_STR) {
/* MPEG-2 packet syntax header flags. */
/* These *DO NOT* appear in padding packets */
/* TODO: They don't appear in several others either! */
/* First byte:
<1,0><PES_scrambling_control:2=0><PES_priority><data_alignment_ind.=0>
<copyright=0><original=1> */
*(index++) = 0x81;
/* Second byte: PTS PTS_DTS or neither? Buffer info?
<PTS_DTS:2><ESCR=0><ES_rate=0>
<DSM_trick_mode:2=0><PES_CRC=0><PES_extension=(!!buffers)>
*/
*(index++) = (timestamps << 6) | (!!buffers);
/* Third byte:
<PES_header_length:8> */
pes_header_len_field = index; /* To fill in later! */
index++;
/* MPEG-2: the timecodes if required */
switch (timestamps) {
case TIMESTAMPBITS_PTS:
BufferDtsPtsMpeg1ScrTimecode (PTS, MARKER_JUST_PTS, &index);
break;
case TIMESTAMPBITS_PTS_DTS:
BufferDtsPtsMpeg1ScrTimecode (PTS, MARKER_PTS, &index);
BufferDtsPtsMpeg1ScrTimecode (DTS, MARKER_DTS, &index);
break;
}
/* MPEG-2 The buffer information in a PES_extension */
if (buffers) {
/* MPEG-2 PES extension header
<PES_private_data:1=0><pack_header_field=0>
<program_packet_sequence_counter=0>
<P-STD_buffer=1><reserved:3=1><{PES_extension_flag_2=0> */
*(index++) = static_cast < uint8_t > (0x1e);
*(index++) = static_cast < uint8_t > (0x40 | (buffer_scale << 5) | (buffer_size >> 8));
*(index++) = static_cast < uint8_t > (buffer_size & 0xff);
}
}
if (mpeg_version == 2 && type != PADDING_STR) {
*pes_header_len_field = static_cast < uint8_t > (index - (pes_header_len_field + 1));
}
header_end = index;
}
/*************************************************************************
* CreateSector
*
* Creates a complete sector to carry a padding packet or a packet
* from one of the elementary streams. Pack and System headers are
* prepended if required.
*
* We allow for situations where want to
* deliberately reduce the payload carried by stuffing.
* This allows us to deal with tricky situations where the
* header overhead of adding in additional information
* would exceed the remaining payload capacity.
*
* Header stuffing and/or a padding packet is appended if the sector is
* unfilled. Zero stuffing after the end of a packet is also supported
* to allow thos wretched audio packets from VCD's to be handled.
*
* TODO: Should really be called "WriteSector"
* TODO: We need to add a mechanism for sub-headers of private streams
* to be generated...
*
*************************************************************************/
unsigned int
PS_Stream::CreateSector (Pack_struc * pack,
Sys_header_struc * sys_header,
unsigned int max_packet_data_size,
MuxStream & strm,
bool buffers,
bool end_marker, clockticks PTS, clockticks DTS, uint8_t timestamps)
{
unsigned int i;
unsigned int j;
uint8_t *index;
uint8_t *size_offset;
uint8_t *fixed_packet_header_end;
uint8_t *pes_header_len_offset = 0;
unsigned int target_packet_data_size;
unsigned int actual_packet_data_size;
int packet_data_to_read;
unsigned int bytes_short;
uint8_t type = strm.stream_id;
uint8_t buffer_scale = strm.BufferScale ();
unsigned int buffer_size = strm.BufferSizeCode ();
unsigned int sector_pack_area;
index = sector_buf;
sector_pack_area = sector_size - strm.zero_stuffing;
if (end_marker)
sector_pack_area -= 4;
BufferSectorHeader (index, pack, sys_header, index);
/* konstante Packet Headerwerte eintragen */
/* write constant packet header data */
*(index++) = static_cast < uint8_t > (PACKET_START) >> 16;
*(index++) = static_cast < uint8_t > (PACKET_START & 0x00ffff) >> 8;
*(index++) = static_cast < uint8_t > (PACKET_START & 0x0000ff);
*(index++) = type;
/* we remember this offset so we can fill in the packet size field once
we know the actual size... */
size_offset = index;
index += 2;
fixed_packet_header_end = index;
if (mpeg_version == 1) {
/* MPEG-1: buffer information */
if (buffers) {
*(index++) = static_cast < uint8_t > (0x40 | (buffer_scale << 5) | (buffer_size >> 8));
*(index++) = static_cast < uint8_t > (buffer_size & 0xff);
}
/* MPEG-1: PTS, PTS & DTS, oder gar nichts? */
/* should we write PTS, PTS & DTS or nothing at all ? */
switch (timestamps) {
case TIMESTAMPBITS_NO:
*(index++) = MARKER_NO_TIMESTAMPS;
break;
case TIMESTAMPBITS_PTS:
BufferDtsPtsMpeg1ScrTimecode (PTS, MARKER_JUST_PTS, &index);
break;
case TIMESTAMPBITS_PTS_DTS:
BufferDtsPtsMpeg1ScrTimecode (PTS, MARKER_PTS, &index);
BufferDtsPtsMpeg1ScrTimecode (DTS, MARKER_DTS, &index);
break;
}
} else if (type != PADDING_STR) {
/* MPEG-2 packet syntax header flags. */
/* These *DO NOT* appear in padding packets */
/* TODO: They don't appear in several others either! */
/* First byte:
<1,0><PES_scrambling_control:2=0><PES_priority><data_alignment_ind.=0>
<copyright=0><original=1> */
*(index++) = 0x81;
/* Second byte: PTS PTS_DTS or neither? Buffer info?
<PTS_DTS:2><ESCR=0><ES_rate=0>
<DSM_trick_mode:2=0><PES_CRC=0><PES_extension=(!!buffers)>
*/
*(index++) = (timestamps << 6) | (!!buffers);
/* Third byte:
<PES_header_length:8> */
pes_header_len_offset = index; /* To fill in later! */
index++;
/* MPEG-2: the timecodes if required */
switch (timestamps) {
case TIMESTAMPBITS_PTS:
BufferDtsPtsMpeg1ScrTimecode (PTS, MARKER_JUST_PTS, &index);
break;
case TIMESTAMPBITS_PTS_DTS:
BufferDtsPtsMpeg1ScrTimecode (PTS, MARKER_PTS, &index);
BufferDtsPtsMpeg1ScrTimecode (DTS, MARKER_DTS, &index);
break;
}
/* MPEG-2 The buffer information in a PES_extension */
if (buffers) {
/* MPEG-2 PES extension header
<PES_private_data:1=0><pack_header_field=0>
<program_packet_sequence_counter=0>
<P-STD_buffer=1><reserved:3=1><{PES_extension_flag_2=0> */
*(index++) = static_cast < uint8_t > (0x1e);
*(index++) = static_cast < uint8_t > (0x40 | (buffer_scale << 5) | (buffer_size >> 8));
*(index++) = static_cast < uint8_t > (buffer_size & 0xff);
}
}
#ifdef MUX_DEBUG
// DVD MPEG2: AC3 in PRIVATE_STR_1
if (type == PRIVATE_STR_1) {
ac3_header = index;
// TODO: should allow multiple AC3 streams...
//ac3_header[0] = AC3_SUB_STR_1; // byte: Audio stream number
// byte: num of AC3 syncwords
// byte: Offset first AC3 syncword (hi)
// byte: Offset 2nd AC2 syncword (lo)
//index += 4;
//subheader_size = 4;
subheader_size = 0;
} else
#endif
/* MPEG-1, MPEG-2: data available to be filled is packet_size less
* header and MPEG-1 trailer... */
target_packet_data_size = sector_pack_area - (index - sector_buf);
/* DEBUG: A handy consistency check when we're messing around */
#ifdef MUX_DEBUG
if (type != PADDING_STR && (end_marker ? target_packet_data_size + 4 : target_packet_data_size)
!=
PacketPayload (strm, sys_header, pack, buffers,
timestamps & TIMESTAMPBITS_PTS, timestamps & TIMESTAMPBITS_DTS))
{
printf ("\nPacket size calculation error %d S%d P%d B%d %d %d!\n ",
timestamps,
sys_header != 0, pack != 0, buffers,
target_packet_data_size,
PacketPayload (strm, sys_header, pack, buffers,
timestamps & TIMESTAMPBITS_PTS, timestamps & TIMESTAMPBITS_DTS));
exit (1);
}
#endif
/* If a maximum payload data size is specified (!=0) and is
smaller than the space available thats all we read (the
remaining space is stuffed) */
if (max_packet_data_size != 0 && max_packet_data_size < target_packet_data_size) {
packet_data_to_read = max_packet_data_size;
} else
packet_data_to_read = target_packet_data_size;
/* MPEG-1, MPEG-2: read in available packet data ... */
actual_packet_data_size = strm.ReadPacketPayload (index, packet_data_to_read);
// DVD MPEG2: AC3 in PRIVATE_STR_1: fill in syncword count and offset
#ifdef MUX_DEBUG
if (type == PRIVATE_STR_1) {
unsigned int syncwords_found;
for (i = 0; i < actual_packet_data_size; ++i) {
if (index[i + 4] == 0x0b && i + 5 < actual_packet_data_size && index[i + 5] == 0x77) {
if (syncwords_found == 0) {
if (ac3_header[2] != static_cast < uint8_t > ((i + 1) >> 8) ||
ac3_header[3] != static_cast < uint8_t > ((i + 1) & 0xff))
printf ("BROKEN HEADER %2x %2x (%2x %2x)\n",
ac3_header[2],
ac3_header[3],
static_cast < uint8_t > ((i + 1) >> 8),
static_cast < uint8_t > ((i + 1) & 0xff));
}
++syncwords_found;
}
}
}
#endif
bytes_short = target_packet_data_size - actual_packet_data_size;
/* Handle the situations where we don't have enough data to fill
the packet size fully ...
Small shortfalls are dealt with by stuffing, big ones by inserting
padding packets.
*/
if (bytes_short < MINIMUM_PADDING_PACKET_SIZE && bytes_short > 0) {
if (mpeg_version == 1) {
/* MPEG-1 stuffing happens *before* header data fields. */
memmove (fixed_packet_header_end + bytes_short,
fixed_packet_header_end, actual_packet_data_size + (index - fixed_packet_header_end)
);
for (j = 0; j < bytes_short; ++j)
fixed_packet_header_end[j] = static_cast < uint8_t > (STUFFING_BYTE);
} else {
memmove (index + bytes_short, index, actual_packet_data_size);
for (j = 0; j < bytes_short; ++j)
*(index + j) = static_cast < uint8_t > (STUFFING_BYTE);
}
index += bytes_short;
bytes_short = 0;
}
/* MPEG-2: we now know the header length... but we mustn't forget
to take into account any non-MPEG headers we've included.
Currently this only happens for AC3 audio, but who knows...
*/
if (mpeg_version == 2 && type != PADDING_STR) {
unsigned int pes_header_len = index - (pes_header_len_offset + 1);
*pes_header_len_offset = static_cast < uint8_t > (pes_header_len);
}
index += actual_packet_data_size;
/* MPEG-1, MPEG-2: Now we know that actual packet size */
size_offset[0] = static_cast < uint8_t > ((index - size_offset - 2) >> 8);
size_offset[1] = static_cast < uint8_t > ((index - size_offset - 2) & 0xff);
/* The case where we have fallen short enough to allow it to be
dealt with by inserting a stuffing packet... */
if (bytes_short != 0) {
*(index++) = static_cast < uint8_t > (PACKET_START) >> 16;
*(index++) = static_cast < uint8_t > (PACKET_START & 0x00ffff) >> 8;
*(index++) = static_cast < uint8_t > (PACKET_START & 0x0000ff);
*(index++) = PADDING_STR;
*(index++) = static_cast < uint8_t > ((bytes_short - 6) >> 8);
*(index++) = static_cast < uint8_t > ((bytes_short - 6) & 0xff);
if (mpeg_version == 2) {
for (i = 0; i < bytes_short - 6; i++)
*(index++) = static_cast < uint8_t > (STUFFING_BYTE);
} else {
*(index++) = 0x0F; /* TODO: A.Stevens 2000 Why is this here? */
for (i = 0; i < bytes_short - 7; i++)
*(index++) = static_cast < uint8_t > (STUFFING_BYTE);
}
bytes_short = 0;
}
if (end_marker) {
*(index++) = static_cast < uint8_t > ((ISO11172_END) >> 24);
*(index++) = static_cast < uint8_t > ((ISO11172_END & 0x00ff0000) >> 16);
*(index++) = static_cast < uint8_t > ((ISO11172_END & 0x0000ff00) >> 8);
*(index++) = static_cast < uint8_t > (ISO11172_END & 0x000000ff);
}
for (i = 0; i < strm.zero_stuffing; i++)
*(index++) = static_cast < uint8_t > (0);
/* At this point padding or stuffing will have ensured the packet
is filled to target_packet_data_size
*/
RawWrite (sector_buf, sector_size);
return actual_packet_data_size;
}
/*************************************************************************
Create_Pack
erstellt in einem Buffer die spezifischen Pack-Informationen.
Diese werden dann spaeter von der Sector-Routine nochmals
in dem Sektor kopiert.
writes specifical pack header information into a buffer
later this will be copied from the sector routine into
the sector buffer
*************************************************************************/
void
PS_Stream::CreatePack (Pack_struc * pack, clockticks SCR, unsigned int mux_rate)
{
uint8_t *index;
index = pack->buf;
*(index++) = static_cast < uint8_t > ((PACK_START) >> 24);
*(index++) = static_cast < uint8_t > ((PACK_START & 0x00ff0000) >> 16);
*(index++) = static_cast < uint8_t > ((PACK_START & 0x0000ff00) >> 8);
*(index++) = static_cast < uint8_t > (PACK_START & 0x000000ff);
if (mpeg_version == 2) {
/* Annoying: MPEG-2's SCR pack header time is different from
all the rest... */
BufferMpeg2ScrTimecode (SCR, &index);
*(index++) = static_cast < uint8_t > (mux_rate >> 14);
*(index++) = static_cast < uint8_t > (0xff & (mux_rate >> 6));
*(index++) = static_cast < uint8_t > (0x03 | ((mux_rate & 0x3f) << 2));
*(index++) = static_cast < uint8_t > (RESERVED_BYTE << 3 | 0); /* No pack stuffing */
} else {
BufferDtsPtsMpeg1ScrTimecode (SCR, MARKER_MPEG1_SCR, &index);
*(index++) = static_cast < uint8_t > (0x80 | (mux_rate >> 15));
*(index++) = static_cast < uint8_t > (0xff & (mux_rate >> 7));
*(index++) = static_cast < uint8_t > (0x01 | ((mux_rate & 0x7f) << 1));
}
pack->SCR = SCR;
pack->length = index - pack->buf;
}
/*************************************************************************
Create_Sys_Header
erstelle in einem Buffer die spezifischen Sys_Header
Informationen. Diese werden spaeter von der Sector-Routine
nochmals zum Sectorbuffer kopiert.
writes specifical system header information into a buffer
later this will be copied from the sector routine into
the sector buffer
RETURN: Length of header created...
*************************************************************************/
void
PS_Stream::CreateSysHeader (Sys_header_struc * sys_header,
unsigned int rate_bound,
bool fixed,
int CSPS,
bool audio_lock, bool video_lock, vector < MuxStream * >&streams)
{
uint8_t *index;
uint8_t *len_index;
int system_header_size;
index = sys_header->buf;
int video_bound = 0;
int audio_bound = 0;
vector < MuxStream * >::iterator str;
for (str = streams.begin (); str < streams.end (); ++str) {
switch (((*str)->stream_id & 0xe0)) {
case 0xe0: // MPEG Video
++video_bound;
break;
case 0xb9: // DVD seems to use this stream id in
++video_bound; // system headers for video buffer size
break;
case 0xc0:
++audio_bound; // MPEG Audio
break;
default:
break;
}
}
/* if we are not using both streams, we should clear some
options here */
*(index++) = static_cast < uint8_t > ((SYS_HEADER_START) >> 24);
*(index++) = static_cast < uint8_t > ((SYS_HEADER_START & 0x00ff0000) >> 16);
*(index++) = static_cast < uint8_t > ((SYS_HEADER_START & 0x0000ff00) >> 8);
*(index++) = static_cast < uint8_t > (SYS_HEADER_START & 0x000000ff);
len_index = index; /* Skip length field for now... */
index += 2;
*(index++) = static_cast < uint8_t > (0x80 | (rate_bound >> 15));
*(index++) = static_cast < uint8_t > (0xff & (rate_bound >> 7));
*(index++) = static_cast < uint8_t > (0x01 | ((rate_bound & 0x7f) << 1));
*(index++) = static_cast < uint8_t > ((audio_bound << 2) | (fixed << 1) | CSPS);
*(index++) = static_cast < uint8_t > ((audio_lock << 7) | (video_lock << 6) | 0x20 | video_bound);
*(index++) = static_cast < uint8_t > (RESERVED_BYTE);
for (str = streams.begin (); str < streams.end (); ++str) {
*(index++) = (*str)->stream_id;
*(index++) = static_cast < uint8_t >
(0xc0 | ((*str)->BufferScale () << 5) | ((*str)->BufferSizeCode () >> 8));
*(index++) = static_cast < uint8_t > ((*str)->BufferSizeCode () & 0xff);
}
system_header_size = (index - sys_header->buf);
len_index[0] = static_cast < uint8_t > ((system_header_size - 6) >> 8);
len_index[1] = static_cast < uint8_t > ((system_header_size - 6) & 0xff);
sys_header->length = system_header_size;
}
void
PS_Stream::RawWrite (uint8_t * buf, unsigned int len)
{
if (callback (this, buf, len, user_data) != len) {
mjpeg_error_exit1 ("Failed write");
}
written += len;
}
/*
* Local variables:
* c-file-style: "stroustrup"
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
Reference in a new issue View git blame Copy permalink