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getbit.cpp
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getbit.cpp
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/*
* Mutated into DGIndex. Modifications Copyright (C) 2004-2008, Donald Graft
*
* Copyright (C) Chia-chen Kuo - April 2001
*
* This file is part of DVD2AVI, a free MPEG-2 decoder
*
* DVD2AVI is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* DVD2AVI is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#define GETBIT_GLOBAL
#include "global.h"
#include "getbit.h"
#include "AC3Dec\ac3.h"
unsigned int start;
int _donread(int fd, void *buffer, unsigned int count)
{
int bytes;
bytes = _read(fd, buffer, count);
return bytes;
}
#define MONO 3
#define STEREO 0
#define LAYER1 3
#define LAYER2 2
#define LAYER3 1
#define LAYERRESERVED 0
#define SAMPLE32K 2
#define SAMPLE44K 0
#define SAMPLERESERVED 3
#define BITRATERESERVED 0xf
int check_audio_syncword(unsigned int audio_id, int layer, int bitrate, int sample, int mode, int emphasis)
{
// Try to validate this syncword by validating semantics of the audio header.
// We're trying to filter out emulated syncwords.
if (layer == LAYERRESERVED)
return 1;
if (bitrate == BITRATERESERVED)
return 1;
if (sample == SAMPLERESERVED)
return 1;
if (layer == LAYER2)
{
if ((bitrate == 1 || bitrate == 2 || bitrate == 3 || bitrate == 5) && mode != MONO)
return 1;
if ((bitrate == 11 || bitrate == 12 || bitrate == 13 || bitrate == 14) && mode == MONO)
return 1;
}
// Emphasis is almost never used. It's less likely than hitting an emulated header. :-)
// if (emphasis != 0)
// return 1;
// The header appears to be valid. Store the audio characteristics.
audio[audio_id].layer = layer;
audio[audio_id].rate = bitrate;
audio[audio_id].sample = sample;
audio[audio_id].mode = mode;
return 0;
}
int PTSDifference(unsigned int apts, unsigned int vpts, int *result)
{
int diff;
if (apts > vpts)
{
diff = (apts - vpts) / 90;
// if (diff > 5000) return 1;
*result = diff;
}
else
{
diff = (vpts - apts) / 90;
// if (diff > 5000) return 1;
*result = -diff;
}
if (diff > 1000 && (D2V_Flag || AudioOnly_Flag) && !CLIActive)
{
MessageBox(hWnd,
"The calculated audio delay is unusually large. This is sometimes\n"
"caused by an initial black video lead in that does not have valid\n"
"timestamps. You can try setting your project range to skip this\n"
"portion of the video. Use the > button to skip GOPS and then hit\n"
"the [ button to set the start of the project. This may give you a\n"
"valid delay value.",
"Audio Delay Warning",
MB_OK | MB_ICONWARNING);
// Reset data timeout.
start = timeGetTime();
}
return 0;
}
FILE *OpenAudio(char *path, char *mode, unsigned int id)
{
// Pick up the first audio file path for
// use in the AVS template.
if (id < LowestAudioId)
{
strcpy(AudioFilePath, path);
LowestAudioId = id;
}
return fopen(path, mode);
}
#define LOCATE \
while (Rdptr >= (Rdbfr + BUFFER_SIZE)) \
{ \
Read = fread(Rdbfr, 1, BUFFER_SIZE, Infile[CurrentFile]); \
if (Read < BUFFER_SIZE) Next_File(); \
Rdptr -= BUFFER_SIZE; \
}
#define DECODE_AC3 \
{ \
if (SystemStream_Flag == TRANSPORT_STREAM && TransportPacketSize == 204) \
Packet_Length -= 16; \
size = 0; \
while (Packet_Length > 0) \
{ \
if (Packet_Length+Rdptr > BUFFER_SIZE+Rdbfr) \
{ \
size = ac3_decode_data(Rdptr, BUFFER_SIZE+Rdbfr-Rdptr, size); \
Packet_Length -= BUFFER_SIZE+Rdbfr-Rdptr; \
Read = fread(Rdbfr, 1, BUFFER_SIZE, Infile[CurrentFile]); \
if (Read < BUFFER_SIZE) Next_File(); \
Rdptr = Rdbfr; \
} \
else \
{ \
size = ac3_decode_data(Rdptr, Packet_Length, size); \
Rdptr += Packet_Length; \
Packet_Length = 0; \
} \
} \
}
// For debugging. Use the macro for release code.
_inline void demux_ac3(int *Packet_Length, unsigned int AUDIO_ID)
{
if (SystemStream_Flag == TRANSPORT_STREAM && TransportPacketSize == 204)
*Packet_Length -= 16;
while (*Packet_Length > 0)
{
if (*Packet_Length+Rdptr > BUFFER_SIZE+Rdbfr)
{
fwrite(Rdptr, BUFFER_SIZE+Rdbfr-Rdptr, 1, audio[AUDIO_ID].file);
*Packet_Length -= BUFFER_SIZE+Rdbfr-Rdptr;
// Read = _donread(Infile[CurrentFile], Rdbfr, BUFFER_SIZE);
Read = fread(Rdbfr, 1, BUFFER_SIZE, Infile[CurrentFile]);
if (Read < BUFFER_SIZE) Next_File();
Rdptr = Rdbfr;
}
else
{
fwrite(Rdptr, *Packet_Length, 1, audio[AUDIO_ID].file);
Rdptr += *Packet_Length;
*Packet_Length = 0;
}
}
}
#define DEMUX_AC3 \
{ \
if (SystemStream_Flag == TRANSPORT_STREAM && TransportPacketSize == 204) \
Packet_Length -= 16; \
while (Packet_Length > 0) \
{ \
if (Packet_Length+Rdptr > BUFFER_SIZE+Rdbfr) \
{ \
fwrite(Rdptr, BUFFER_SIZE+Rdbfr-Rdptr, 1, audio[AUDIO_ID].file); \
Packet_Length -= BUFFER_SIZE+Rdbfr-Rdptr; \
Read = fread(Rdbfr, 1, BUFFER_SIZE, Infile[CurrentFile]); \
if (Read < BUFFER_SIZE) Next_File(); \
Rdptr = Rdbfr; \
} \
else \
{ \
fwrite(Rdptr, Packet_Length, 1, audio[AUDIO_ID].file); \
Rdptr += Packet_Length; \
Packet_Length = 0; \
} \
} \
}
void DemuxLPCM(int *size, int *Packet_Length, unsigned char PCM_Buffer[], unsigned char format)
{
unsigned char tmp[12];
int i;
*size = 0;
while (*Packet_Length > 0)
{
if (*Packet_Length + Rdptr > BUFFER_SIZE + Rdbfr)
{
memcpy(PCM_Buffer + *size, Rdptr, BUFFER_SIZE + Rdbfr - Rdptr);
*size += (BUFFER_SIZE + Rdbfr - Rdptr);
*Packet_Length -= (BUFFER_SIZE + Rdbfr - Rdptr);
// Read = _donread(Infile[CurrentFile], Rdbfr, BUFFER_SIZE);
Read = fread(Rdbfr, 1, BUFFER_SIZE, Infile[CurrentFile]);
if (Read < BUFFER_SIZE)
Next_File();
Rdptr = Rdbfr;
}
else
{
memcpy(PCM_Buffer + *size, Rdptr, *Packet_Length);
Rdptr += *Packet_Length;
*size += *Packet_Length;
*Packet_Length = 0;
}
}
if ((format & 0xc0) == 0)
{
// 16-bit LPCM.
for (i = 0; i < *size; i += 2)
{
tmp[0] = PCM_Buffer[i];
PCM_Buffer[i] = PCM_Buffer[i+1];
PCM_Buffer[i+1] = tmp[0];
}
}
else
{
// 24-bit LPCM.
if ((format & 0x07) + 1 == 1)
{
// Mono
for (i = 0; i < *size; i += 6)
{
tmp[0]=PCM_Buffer[i+4];
tmp[1]=PCM_Buffer[i+1];
tmp[2]=PCM_Buffer[i+0];
tmp[3]=PCM_Buffer[i+5];
tmp[4]=PCM_Buffer[i+3];
tmp[5]=PCM_Buffer[i+2];
memcpy(&PCM_Buffer[i], tmp, 6);
}
}
else
{
// Stereo
for (i = 0; i < *size; i += 12)
{
tmp[0] = PCM_Buffer[i+8];
tmp[1] = PCM_Buffer[i+1];
tmp[2] = PCM_Buffer[i+0];
tmp[3] = PCM_Buffer[i+9];
tmp[4] = PCM_Buffer[i+3];
tmp[5] = PCM_Buffer[i+2];
tmp[6] = PCM_Buffer[i+10];
tmp[7] = PCM_Buffer[i+5];
tmp[8] = PCM_Buffer[i+4];
tmp[9] = PCM_Buffer[i+11];
tmp[10] = PCM_Buffer[i+7];
tmp[11] = PCM_Buffer[i+6];
memcpy(&PCM_Buffer[i], tmp, 12);
}
}
}
}
#define DEMUX_MPA_AAC(fp) \
{ \
if (SystemStream_Flag == TRANSPORT_STREAM && TransportPacketSize == 204) \
Packet_Length -= 16; \
while (Packet_Length > 0) \
{ \
if (Packet_Length+Rdptr > BUFFER_SIZE+Rdbfr) \
{ \
fwrite(Rdptr, BUFFER_SIZE+Rdbfr-Rdptr, 1, (fp)); \
Packet_Length -= BUFFER_SIZE+Rdbfr-Rdptr; \
Read = fread(Rdbfr, 1, BUFFER_SIZE, Infile[CurrentFile]); \
if (Read < BUFFER_SIZE) Next_File(); \
Rdptr = Rdbfr; \
} \
else \
{ \
fwrite(Rdptr, Packet_Length, 1, (fp)); \
Rdptr += Packet_Length; \
Packet_Length = 0; \
} \
} \
}
#define DEMUX_DTS \
{ \
if (SystemStream_Flag == TRANSPORT_STREAM && TransportPacketSize == 204) \
Packet_Length -= 16; \
while (Packet_Length > 0) \
{ \
if (Packet_Length+Rdptr > BUFFER_SIZE+Rdbfr) \
{ \
fwrite(Rdptr, BUFFER_SIZE+Rdbfr-Rdptr, 1, audio[AUDIO_ID].file); \
Packet_Length -= BUFFER_SIZE+Rdbfr-Rdptr; \
Read = fread(Rdbfr, 1, BUFFER_SIZE, Infile[CurrentFile]); \
if (Read < BUFFER_SIZE) Next_File(); \
Rdptr = Rdbfr; \
} \
else \
{ \
fwrite(Rdptr, Packet_Length, 1, audio[AUDIO_ID].file); \
Rdptr += Packet_Length; \
Packet_Length = 0; \
} \
} \
}
static char *FTType[5] = {
"48KHz", "44.1KHz", "44.1KHz", "44.1KHz", "44.1KHz"
};
static char *AC3ModeDash[8] = {
"1+1", "1_0", "2_0", "3_0", "2_1", "3_1", "2_2", "3_2"
};
static char *AC3Mode[8] = {
"1+1", "1/0", "2/0", "3/0", "2/1", "3/1", "2/2", "3/2"
};
static int AC3Rate[32] = {
32, 40, 48, 56, 64, 80, 96, 112, 128, 160,
192, 224, 256, 320, 384, 448, 512, 576, 640,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static char *MPALayer[4] = {
"", "L3", "L2", "L1"
};
static char *MPAExtension[4] = {
"mpa", "mp3", "mp2", "mp1"
};
static char *MPAMode[4] = {
"2ch", "2ch", "2ch", "mono"
};
static char *MPASample[3] = {
"44.1", "48", "32"
};
static char *MPARate[4][15] = {
{ "", "", "", "", "", "", "", "", "", "", "", "", "", "", "" }, // Layer reserved
{ "free", "32", "40", "48", "56", "64", "80", "96", "112", "128", "160", "192", "224", "256", "320" }, // Layer 3
{ "free", "32", "48", "56", "64", "80", "96", "112", "128", "160", "192", "224", "256", "320", "384" }, // Layer 2
{ "free", "32", "64", "96", "128", "160", "192", "224", "256", "288", "320", "352", "384", "416", "448" } // Layer 1
};
unsigned int VideoPTS, AudioPTS;
static unsigned char PCM_Buffer[SECTOR_SIZE];
static short *ptrPCM_Buffer = (short*)PCM_Buffer;
unsigned char *buffer_invalid;
void VideoDemux(void);
void Initialize_Buffer()
{
Rdptr = Rdbfr + BUFFER_SIZE;
Rdmax = Rdptr;
buffer_invalid = (unsigned char *) 0xffffffff;
if (SystemStream_Flag != ELEMENTARY_STREAM && !AudioOnly_Flag)
{
if (Rdptr >= Rdmax)
Next_Packet();
CurrentBfr = *Rdptr++ << 24;
if (Rdptr >= Rdmax)
Next_Packet();
CurrentBfr += *Rdptr++ << 16;
if (Rdptr >= Rdmax)
Next_Packet();
CurrentBfr += *Rdptr++ << 8;
if (Rdptr >= Rdmax)
Next_Packet();
CurrentBfr += *Rdptr++;
Fill_Next();
}
else
{
Fill_Buffer();
CurrentBfr = (*Rdptr << 24) + (*(Rdptr+1) << 16) + (*(Rdptr+2) << 8) + *(Rdptr+3);
Rdptr += 4;
Fill_Next();
}
BitsLeft = 32;
}
// Skips ahead in transport stream by specified number of bytes.
#define SKIP_TRANSPORT_PACKET_BYTES(bytes_to_skip) \
{ \
int temp = (bytes_to_skip); \
while (temp > 0) \
{ \
if (temp + Rdptr > BUFFER_SIZE + Rdbfr) \
{ \
temp -= BUFFER_SIZE + Rdbfr - Rdptr; \
Read = fread(Rdbfr, 1, BUFFER_SIZE, Infile[CurrentFile]); \
if (Read < BUFFER_SIZE) Next_File(); \
Rdptr = Rdbfr; \
} \
else \
{ \
Rdptr += temp; \
temp = 0; \
} \
} \
Packet_Length -= (bytes_to_skip); \
}
// Transport packet data structure.
typedef struct
{
// 1 byte
unsigned char sync_byte; // 8 bits
// 2 bytes
unsigned char transport_error_indicator; // 1 bit
unsigned char payload_unit_start_indicator; // 1 bit
unsigned char transport_priority; // 1 bit
unsigned short pid; // 13 bits
// 1 byte
unsigned char transport_scrambling_control; // 2 bits
unsigned char adaptation_field_control; // 2 bits
unsigned char continuity_counter; // 4 bits
// 1 byte
unsigned char adaptation_field_length; // 8 bits
// 1 byte
unsigned char discontinuity_indicator; // 1 bit
unsigned char random_access_indicator; // 1 bit
unsigned char elementary_stream_priority_indicator; // 1 bit
unsigned char PCR_flag; // 1 bit
unsigned char OPCR_flag; // 1 bit
unsigned char splicing_point_flag; // 1 bit
unsigned char transport_private_data_flag; // 1 bit
unsigned char adaptation_field_extension_flag; // 1 bit
} transport_packet;
transport_packet tp_zeroed = { 0 };
// ATSC transport stream parser.
// We ignore the 'continuity counter' because with some DTV
// broadcasters, this isnt a reliable indicator.
void Next_Transport_Packet()
{
static int i, Packet_Length, Packet_Header_Length, size;
static unsigned int code, flags, VOBCELL_Count, AUDIO_ID = 0;
__int64 PES_PTS, PES_DTS;
unsigned int pts_stamp = 0, dts_stamp = 0;
int PTSDiff;
unsigned int bytes_left;
transport_packet tp;
unsigned int time;
double picture_period;
char ext[4], EXT[4];
start = timeGetTime();
for (;;)
{
PES_PTS = 0;
bytes_left = 0;
Packet_Length = TransportPacketSize; // total length of an MPEG-2 transport packet
tp = tp_zeroed; // to avoid warnings
// If the packet size is 192, then assume it is an M2TS (blueray) file, which has 4 extra bytes
// in front of the sync byte.
if (TransportPacketSize == 192)
{
// Suck up the extra bytes.
Get_Byte();
Get_Byte();
Get_Byte();
Get_Byte();
Packet_Length -= 4;
}
retry_sync:
// Don't loop forever. If we don't get data
// in a reasonable time (5 secs) we exit.
time = timeGetTime();
if (time - start > 5000)
{
MessageBox(hWnd, "Cannot find audio or video data. Ensure that your PIDs\nare set correctly in the Stream menu. Refer to the\nUsers Manual for details.",
NULL, MB_OK | MB_ICONERROR);
ThreadKill(MISC_KILL);
}
// Search for a sync byte. Gives some protection against emulation.
if (Stop_Flag)
ThreadKill(MISC_KILL);
if (Get_Byte() != 0x47)
goto retry_sync;
if (Rdptr - Rdbfr > TransportPacketSize)
{
if (Rdptr[-(TransportPacketSize+1)] != 0x47)
goto retry_sync;
}
else if (Rdbfr + Read - Rdptr > TransportPacketSize - 1)
{
if (Rdptr[+(TransportPacketSize-1)] != 0x47)
goto retry_sync;
}
else
{
// We can't check so just accept this sync byte.
}
// Record the location of the start of the packet. This will be used
// for indexing when an I frame is detected.
if (D2V_Flag)
{
// PackHeaderPosition = _telli64(Infile[CurrentFile])
PackHeaderPosition = _ftelli64(Infile[CurrentFile])
- (__int64)BUFFER_SIZE + (__int64)Rdptr - (__int64)Rdbfr - 1;
}
// For M2TS (blueray) files, index the extra 4 bytes in front of the sync byte,
// because DGDecode will expect to see them.
if (TransportPacketSize == 192)
PackHeaderPosition -= 4;
--Packet_Length; // swallow the sync_byte
code = Get_Short();
Packet_Length = Packet_Length - 2; // swallow the two bytes we just got
tp.pid = (unsigned short) (code & 0x1FFF);
tp.transport_error_indicator = (unsigned char) ((code >> 15) & 0x01);
tp.payload_unit_start_indicator = (unsigned char) ((code >> 14) & 0x01);
tp.transport_priority = (unsigned char) ((code >> 13) & 0x01);
if (tp.transport_error_indicator)
{
// Skip remaining bytes in current packet.
SKIP_TRANSPORT_PACKET_BYTES(Packet_Length);
// Try the next packet in the stream.
continue;
}
code = Get_Byte();
--Packet_Length; // decrement the 1 byte we just got;
tp.transport_scrambling_control = (unsigned char) ((code >> 6) & 0x03);// 2 bslbf
tp.adaptation_field_control = (unsigned char) ((code >> 4 ) & 0x03);// 2 bslbf
tp.continuity_counter = (unsigned char) (code & 0x0F);// 4 uimsbf
// we don't care about the continuity counter
if (tp.adaptation_field_control == 0)
{
// no payload
// skip remaining bytes in current packet
SKIP_TRANSPORT_PACKET_BYTES( Packet_Length )
continue;
}
// 3) check the Adaptation-header, only so we can determine
// the exact #bytes to skip
if ( tp.adaptation_field_control == 2 || tp.adaptation_field_control == 3)
{
// adaptation field is present
tp.adaptation_field_length = (unsigned char) Get_Byte(); // 8-bits
--Packet_Length; // decrement the 1 byte we just got;
if ( tp.adaptation_field_length != 0 ) // end of field already?
{
code = Get_Byte();
--Packet_Length; // decrement the 1 byte we just got;
tp.discontinuity_indicator = (unsigned char) ((code >> 7) & 0x01); // 1 bslbf
tp.random_access_indicator = (unsigned char) ((code >> 6) & 0x01); // 1 bslbf
tp.elementary_stream_priority_indicator = (unsigned char) ((code >> 5) & 0x01); // 1 bslbf
tp.PCR_flag = (unsigned char) ((code >> 4) & 0x01); // 1 bslbf
tp.OPCR_flag = (unsigned char) ((code >> 3) & 0x01); // 1 bslbf
tp.splicing_point_flag = (unsigned char) ((code >> 2) & 0x01); // 1 bslbf
tp.transport_private_data_flag = (unsigned char) ((code >> 1) & 0x01); // 1 bslbf
tp.adaptation_field_extension_flag = (unsigned char) ((code >> 0) & 0x01); // 1 bslbf
bytes_left = tp.adaptation_field_length - 1;
if (LogTimestamps_Flag && D2V_Flag && tp.PCR_flag && tp.pid == MPEG2_Transport_PCRPID && StartLogging_Flag)
{
__int64 PCR, PCRbase, PCRext, tmp;
char pcr[64];
tmp = (__int64) Get_Byte();
PCRbase = tmp << 25;
tmp = (__int64) Get_Byte();
PCRbase |= tmp << 17;
tmp = (__int64) Get_Byte();
PCRbase |= tmp << 9;
tmp = (__int64) Get_Byte();
PCRbase |= tmp << 1;
tmp = (__int64) Get_Byte();
PCRbase |= tmp >> 7;
PCRext = (tmp & 0x01) << 8;
tmp = (__int64) Get_Byte();
PCRext |= tmp;
PCR = 300 * PCRbase + PCRext;
_i64toa(PCR, pcr, 10);
fprintf(Timestamps, "PCR %s ", pcr);
_i64toa(PCR/27000, pcr, 10);
bytes_left -= 6;
Packet_Length -= 6;
fprintf(Timestamps, "[%sms]\n", pcr);
}
// skip the remainder of the adaptation_field
SKIP_TRANSPORT_PACKET_BYTES( bytes_left )
} // if ( tp.adaptation_field_length != 0 )
} // if ( tp.adaptation_field_control != 1 )
// We've processed the MPEG-2 transport header.
// Any data left in the current transport packet?
if (Packet_Length == 0)
continue;
if (tp.pid && tp.pid == MPEG2_Transport_VideoPID)
{
LOCATE
if (tp.payload_unit_start_indicator)
{
Get_Short();
Get_Short();
Get_Short(); // MPEG2-PES total Packet_Length
Get_Byte(); // skip a byte
flags = Get_Byte();
Packet_Header_Length = Get_Byte();
Packet_Length = Packet_Length - 9; // compensate the bytes we extracted
// Get timestamp, and skip rest of PES-header.
if ((flags & 0x80) && (Packet_Header_Length > 4))
{
PES_PTS = (Get_Byte() & 0x0e) << 29;
PES_PTS |= (Get_Short() & 0xfffe) << 14;
PES_PTS |= (Get_Short()>>1) & 0x7fff;
pts_stamp = (unsigned int) (PES_PTS & 0xffffffff);
if (LogTimestamps_Flag && D2V_Flag && StartLogging_Flag)
fprintf(Timestamps, "V PTS %u [%ums]\n", pts_stamp, pts_stamp/90);
Packet_Length -= 5;
// DTS is not used. The code is here for analysis and debugging.
if ((flags & 0xc0) == 0xc0)
{
PES_DTS = (Get_Byte() & 0x0e) << 29;
PES_DTS |= (Get_Short() & 0xfffe) << 14;
PES_DTS |= (Get_Short()>>1) & 0x7fff;
dts_stamp = (unsigned int) (PES_DTS & 0xffffffff);
if (LogTimestamps_Flag && D2V_Flag && StartLogging_Flag)
fprintf(Timestamps, "V DTS %u [%ums]\n", dts_stamp, dts_stamp/90);
Packet_Length -= 5;
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length - 10)
}
else
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length - 5)
}
else
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length);
if (!Start_Flag)
{
// Start_Flag becomes true after the first I frame.
// So VideoPTS will be left at the value corresponding to
// the first I frame.
VideoPTS = pts_stamp;
}
}
Rdmax = Rdptr + Packet_Length;
if (TransportPacketSize == 204)
Rdmax -= 16;
Bitrate_Monitor += (Rdmax - Rdptr);
if (AudioOnly_Flag)
SKIP_TRANSPORT_PACKET_BYTES(Packet_Length);
return;
}
else if ((Method_Flag == AUDIO_DEMUXALL || Method_Flag == AUDIO_DEMUX) && Start_Flag &&
tp.pid && (tp.pid == MPEG2_Transport_AudioPID) &&
(MPEG2_Transport_AudioType == 3 || MPEG2_Transport_AudioType == 4 || MPEG2_Transport_AudioType == 0xffffffff))
{
// Both MPEG and AAC audio come here. The sync word will be checked to
// distinguish between them.
if (mpafp)
{
if (tp.payload_unit_start_indicator)
{
Get_Short(); // start code and stream id
Get_Short();
Get_Short(); // packet length
Get_Byte(); // flags
code = Get_Byte(); // more flags
Packet_Header_Length = Get_Byte();
Packet_Length -= 9;
if (code & 0x80)
{
// unsigned int dts_stamp;
code = Get_Byte();
PES_PTS = (code & 0x0e) << 29;
PES_PTS |= (Get_Short() & 0xfffe) << 14;
PES_PTS |= (Get_Short()>>1) & 0x7fff;
AudioPTS = (unsigned int) (PES_PTS & 0xffffffff);
if (LogTimestamps_Flag && D2V_Flag && StartLogging_Flag)
fprintf(Timestamps, " A00 PTS %u [%ums]\n", AudioPTS, AudioPTS/90);
Packet_Length -= 5;
#if 0
if ((code & 0xc0) == 0xc0)
{
PES_DTS = (Get_Byte() & 0x0e) << 29;
PES_DTS |= (Get_Short() & 0xfffe) << 14;
PES_DTS |= (Get_Short()>>1) & 0x7fff;
dts_stamp = (unsigned int) (PES_DTS & 0xffffffff);
if (LogTimestamps_Flag && D2V_Flag && StartLogging_Flag)
fprintf(Timestamps, "A DTS %u [%ums]\n", dts_stamp, dts_stamp/90);
Packet_Length -= 5;
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length - 10)
}
else
#endif
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length-5)
}
}
DEMUX_MPA_AAC(mpafp);
}
else if (tp.payload_unit_start_indicator)
{
Get_Short(); // start code
Get_Short(); // rest of start code and stream id
Get_Short(); // packet length
Get_Byte(); // flags
code = Get_Byte(); // more flags
Packet_Header_Length = Get_Byte();
Packet_Length -= 9;
if (code & 0x80)
{
// unsigned int dts_stamp;
code = Get_Byte();
PES_PTS = (code & 0x0e) << 29;
PES_PTS |= (Get_Short() & 0xfffe) << 14;
PES_PTS |= (Get_Short()>>1) & 0x7fff;
AudioPTS = (unsigned int) (PES_PTS & 0xffffffff);
if (LogTimestamps_Flag && D2V_Flag && StartLogging_Flag)
fprintf(Timestamps, " A00 PTS %u [%ums]\n", AudioPTS, AudioPTS/90);
Packet_Length = Packet_Length - 5;
#if 0
if ((code & 0xc0) == 0xc0)
{
PES_DTS = (Get_Byte() & 0x0e) << 29;
PES_DTS |= (Get_Short() & 0xfffe) << 14;
PES_DTS |= (Get_Short()>>1) & 0x7fff;
dts_stamp = (unsigned int) (PES_DTS & 0xffffffff);
if (LogTimestamps_Flag && D2V_Flag && StartLogging_Flag)
fprintf(Timestamps, "A DTS %u [%ums]\n", dts_stamp, dts_stamp/90);
Packet_Length -= 5;
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length - 10)
}
else
#endif
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length-5)
// Now we're at the start of the audio.
// Find the audio header.
code = Get_Byte();
code = ((code & 0xff) << 8) | Get_Byte();
Packet_Length -= 2;
while ((code & 0xfff8) != 0xfff8 && Packet_Length > 0)
{
emulated3:
code = ((code & 0xff) << 8) | Get_Byte();
Packet_Length--;
}
if ((code & 0xfff8) != 0xfff8)
{
SKIP_TRANSPORT_PACKET_BYTES(Packet_Length);
continue;
}
// Found the audio header. Now check the layer field.
// For MPEG, layer is 1, 2, or 3. For AAC, it is 0.
// We demux the same for both; only the filename we create is different.
if (((code & 6) >> 1) == 0x00)
{
// AAC audio.
audio[0].type = FORMAT_AAC;
}
else
{
// MPEG audio.
// Try to detect emulated sync words by enforcing semantics.
if (check_audio_syncword(0, (code >> 1) & 3, (Rdptr[0] >> 4) & 0xf, (Rdptr[0] >> 2) & 3, (Rdptr[1] >> 6) & 3, Rdptr[1] & 3))
{
goto emulated3;
}
audio[0].type = FORMAT_MPA;
}
if (AudioOnly_Flag)
{
char *p;
strcpy(szOutput, Infilename[0]);
p = &szOutput[sizeof(szOutput)];
while (*p != '.') p--;
*p = 0;
if (audio[0].type == FORMAT_AAC)
sprintf(szBuffer, "%s PID %03x.aac", szOutput, MPEG2_Transport_AudioPID);
else
sprintf(szBuffer, "%s PID %03x %s %s %s %s.%s", szOutput, MPEG2_Transport_AudioPID,
MPALayer[audio[0].layer], MPAMode[audio[0].mode], MPASample[audio[0].sample],
MPARate[audio[0].layer][audio[0].rate],
UseMPAExtensions ? MPAExtension[0] : MPAExtension[audio[0].layer]);
}
else
{
// Adjust the VideoPTS to account for frame reordering.
if (!PTSAdjustDone)
{
PTSAdjustDone = 1;
picture_period = 1.0 / frame_rate;
VideoPTS -= (int) (LeadingBFrames * picture_period * 90000);
}
if (PTSDifference(AudioPTS, VideoPTS, &PTSDiff))
{
if (audio[0].type == FORMAT_AAC)
sprintf(szBuffer, "%s PID %03x.aac", szOutput, MPEG2_Transport_AudioPID);
else
sprintf(szBuffer, "%s PID %03x %s %s %s %s.%s", szOutput, MPEG2_Transport_AudioPID,
MPALayer[audio[0].layer], MPAMode[audio[0].mode], MPASample[audio[0].sample],
MPARate[audio[0].layer][audio[0].rate],
UseMPAExtensions ? MPAExtension[0] : MPAExtension[audio[0].layer]);
}
else
{
if (audio[0].type == FORMAT_AAC)
sprintf(szBuffer, "%s PID %03x DELAY %dms.aac", szOutput, MPEG2_Transport_AudioPID, PTSDiff);
else
sprintf(szBuffer, "%s PID %03x %s %s %s %s DELAY %dms.%s", szOutput, MPEG2_Transport_AudioPID,
MPALayer[audio[0].layer], MPAMode[audio[0].mode], MPASample[audio[0].sample],
MPARate[audio[0].layer][audio[0].rate], PTSDiff,
UseMPAExtensions ? MPAExtension[0] : MPAExtension[audio[0].layer]);
}
}
Packet_Length += 2;
Rdptr -= 2;
if (D2V_Flag || AudioOnly_Flag)
{
mpafp = OpenAudio(szBuffer, "wb", 0);
if (mpafp == NULL)
{
// Cannot open the output file, Disable further audio processing.
MPEG2_Transport_AudioType = 0xff;
SKIP_TRANSPORT_PACKET_BYTES(Packet_Length);
continue;
}
DEMUX_MPA_AAC(mpafp);
}
}
}
if (AudioOnly_Flag && Info_Flag && !(AudioPktCount++ % 128))
UpdateInfo();
}
else if ((Method_Flag == AUDIO_DEMUXALL || Method_Flag == AUDIO_DEMUX) && Start_Flag &&
tp.pid && (tp.pid == MPEG2_Transport_AudioPID) && (MPEG2_Transport_AudioType == 0x80))
{
if (pcmfp)
{
if (tp.payload_unit_start_indicator)
{
Get_Short(); // start code and stream id
Get_Short();
Get_Short(); // packet length
Get_Byte(); // flags
code = Get_Byte(); // more flags
Packet_Header_Length = Get_Byte();
Packet_Length -= 9;
if (code & 0x80)
{
code = Get_Byte();
PES_PTS = (code & 0x0e) << 29;
PES_PTS |= (Get_Short() & 0xfffe) << 14;
PES_PTS |= (Get_Short()>>1) & 0x7fff;
AudioPTS = (unsigned int) (PES_PTS & 0xffffffff);
if (LogTimestamps_Flag && D2V_Flag && StartLogging_Flag)
fprintf(Timestamps, " A00 PTS %u [%ums]\n", AudioPTS, AudioPTS/90);
Packet_Length -= 5;
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length-5)
}
// Now we're at the start of the audio.
code = Get_Byte();
code = Get_Byte();
audio[0].format_m2ts = Get_Short();
Packet_Length -= 4;
}
DEMUX_MPA_AAC(pcmfp);
}
else if (tp.payload_unit_start_indicator)
{
audio[0].type = FORMAT_LPCM_M2TS;
strcpy(ext, "pcm");
strcpy(EXT, "pcm");
_strupr(EXT);
Get_Short(); // start code
Get_Short(); // rest of start code and stream id
Get_Short(); // packet length
Get_Byte(); // flags
code = Get_Byte(); // more flags
Packet_Header_Length = Get_Byte();
Packet_Length -= 9;
if (code & 0x80)
{
code = Get_Byte();
PES_PTS = (code & 0x0e) << 29;
PES_PTS |= (Get_Short() & 0xfffe) << 14;
PES_PTS |= (Get_Short()>>1) & 0x7fff;
AudioPTS = (unsigned int) (PES_PTS & 0xffffffff);
if (LogTimestamps_Flag && D2V_Flag && StartLogging_Flag)
fprintf(Timestamps, " A00 PTS %u [%ums]\n", AudioPTS, AudioPTS/90);
Packet_Length = Packet_Length - 5;
SKIP_TRANSPORT_PACKET_BYTES(Packet_Header_Length-5)
// Now we're at the start of the audio.
code = Get_Byte();
code = Get_Byte();
audio[0].format_m2ts = Get_Short();
Packet_Length -= 4;
if (AudioOnly_Flag)
{
char *p;
strcpy(szOutput, Infilename[0]);
p = &szOutput[sizeof(szOutput)];
while (*p != '.') p--;
*p = 0;
sprintf(szBuffer, "%s %s PID %03x.%s", szOutput, EXT, MPEG2_Transport_AudioPID, ext);
}
else
{
// Adjust the VideoPTS to account for frame reordering.
if (!PTSAdjustDone)
{
PTSAdjustDone = 1;
picture_period = 1.0 / frame_rate;
VideoPTS -= (int) (LeadingBFrames * picture_period * 90000);
}
if (PTSDifference(AudioPTS, VideoPTS, &PTSDiff))
sprintf(szBuffer, "%s %s PID %03x.%s",
szOutput, EXT, MPEG2_Transport_AudioPID, ext);
else
sprintf(szBuffer, "%s %s PID %03x DELAY %dms.%s",
szOutput, EXT, MPEG2_Transport_AudioPID, PTSDiff, ext);
}
if (D2V_Flag || AudioOnly_Flag)
{
pcmfp = OpenAudio(szBuffer, "wb", 0);
if (pcmfp == NULL)
{
// Cannot open the output file, Disable further audio processing.
MPEG2_Transport_AudioType = 0xff;
SKIP_TRANSPORT_PACKET_BYTES(Packet_Length);
continue;
}
DEMUX_MPA_AAC(pcmfp);
}
}
}
if (AudioOnly_Flag && Info_Flag && !(AudioPktCount++ % 128))
UpdateInfo();
}
else if (tp.pid && tp.pid == MPEG2_Transport_AudioPID && (MPEG2_Transport_AudioType == 0x81))
{
// We are demuxing AC3 audio.
// search for an MPEG-PES packet header
if (tp.random_access_indicator || tp.payload_unit_start_indicator )
{
LOCATE
code = Get_Short();
code = (code & 0xffff)<<16 | Get_Short();
Packet_Length = Packet_Length - 4; // remove these two bytes