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/*
* Copyright (C) 2010-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "AEPackIEC61937.h"
#include <cassert>
#include <string.h>
#define IEC61937_PREAMBLE1 0xF872
#define IEC61937_PREAMBLE2 0x4E1F
inline void SwapEndian(uint16_t *dst, uint16_t *src, unsigned int size)
{
for (unsigned int i = 0; i < size; ++i, ++dst, ++src)
*dst = ((*src & 0xFF00) >> 8) | ((*src & 0x00FF) << 8);
}
int CAEPackIEC61937::PackAC3(uint8_t *data, unsigned int size, uint8_t *dest)
{
assert(size <= OUT_FRAMESTOBYTES(AC3_FRAME_SIZE));
struct IEC61937Packet *packet = (struct IEC61937Packet*)dest;
packet->m_preamble1 = IEC61937_PREAMBLE1;
packet->m_preamble2 = IEC61937_PREAMBLE2;
packet->m_length = size << 3;
if (data == NULL)
data = packet->m_data;
#ifdef __BIG_ENDIAN__
else
memcpy(packet->m_data, data, size);
#else
int bitstream_mode = data[5] & 0x7;
packet->m_type = IEC61937_TYPE_AC3 | (bitstream_mode << 8);
size += size & 0x1;
SwapEndian((uint16_t*)packet->m_data, (uint16_t*)data, size >> 1);
#endif
memset(packet->m_data + size, 0, OUT_FRAMESTOBYTES(AC3_FRAME_SIZE) - IEC61937_DATA_OFFSET - size);
return OUT_FRAMESTOBYTES(AC3_FRAME_SIZE);
}
int CAEPackIEC61937::PackEAC3(uint8_t *data, unsigned int size, uint8_t *dest)
{
assert(size <= OUT_FRAMESTOBYTES(EAC3_FRAME_SIZE));
struct IEC61937Packet *packet = (struct IEC61937Packet*)dest;
packet->m_preamble1 = IEC61937_PREAMBLE1;
packet->m_preamble2 = IEC61937_PREAMBLE2;
packet->m_type = IEC61937_TYPE_EAC3;
packet->m_length = size;
if (data == NULL)
data = packet->m_data;
#ifdef __BIG_ENDIAN__
else
memcpy(packet->m_data, data, size);
#else
size += size & 0x1;
SwapEndian((uint16_t*)packet->m_data, (uint16_t*)data, size >> 1);
#endif
memset(packet->m_data + size, 0, OUT_FRAMESTOBYTES(EAC3_FRAME_SIZE) - IEC61937_DATA_OFFSET - size);
return OUT_FRAMESTOBYTES(EAC3_FRAME_SIZE);
}
int CAEPackIEC61937::PackDTS_512(uint8_t *data, unsigned int size, uint8_t *dest, bool littleEndian)
{
return PackDTS(data, size, dest, littleEndian, OUT_FRAMESTOBYTES(DTS1_FRAME_SIZE), IEC61937_TYPE_DTS1);
}
int CAEPackIEC61937::PackDTS_1024(uint8_t *data, unsigned int size, uint8_t *dest, bool littleEndian)
{
return PackDTS(data, size, dest, littleEndian, OUT_FRAMESTOBYTES(DTS2_FRAME_SIZE), IEC61937_TYPE_DTS2);
}
int CAEPackIEC61937::PackDTS_2048(uint8_t *data, unsigned int size, uint8_t *dest, bool littleEndian)
{
return PackDTS(data, size, dest, littleEndian, OUT_FRAMESTOBYTES(DTS3_FRAME_SIZE), IEC61937_TYPE_DTS3);
}
int CAEPackIEC61937::PackTrueHD(uint8_t *data, unsigned int size, uint8_t *dest)
{
if (size == 0)
return OUT_FRAMESTOBYTES(TRUEHD_FRAME_SIZE);
assert(size <= OUT_FRAMESTOBYTES(TRUEHD_FRAME_SIZE));
struct IEC61937Packet *packet = (struct IEC61937Packet*)dest;
packet->m_preamble1 = IEC61937_PREAMBLE1;
packet->m_preamble2 = IEC61937_PREAMBLE2;
packet->m_type = IEC61937_TYPE_TRUEHD;
packet->m_length = size;
if (data == NULL)
data = packet->m_data;
#ifdef __BIG_ENDIAN__
else
memcpy(packet->m_data, data, size);
#else
size += size & 0x1;
SwapEndian((uint16_t*)packet->m_data, (uint16_t*)data, size >> 1);
#endif
memset(packet->m_data + size, 0, OUT_FRAMESTOBYTES(TRUEHD_FRAME_SIZE) - IEC61937_DATA_OFFSET - size);
return OUT_FRAMESTOBYTES(TRUEHD_FRAME_SIZE);
}
int CAEPackIEC61937::PackDTSHD(uint8_t *data, unsigned int size, uint8_t *dest, unsigned int period)
{
unsigned int subtype;
switch (period)
{
case 512: subtype = 0; break;
case 1024: subtype = 1; break;
case 2048: subtype = 2; break;
case 4096: subtype = 3; break;
case 8192: subtype = 4; break;
case 16384: subtype = 5; break;
default:
return 0;
}
struct IEC61937Packet *packet = (struct IEC61937Packet*)dest;
packet->m_preamble1 = IEC61937_PREAMBLE1;
packet->m_preamble2 = IEC61937_PREAMBLE2;
packet->m_type = IEC61937_TYPE_DTSHD | (subtype << 8);
/* Align so that (length_code & 0xf) == 0x8. This is reportedly needed
* with some receivers, but the exact requirement is unconfirmed. */
packet->m_length = ((size + 0x17) &~ 0x0f) - 0x08;
if (data == NULL)
data = packet->m_data;
#ifdef __BIG_ENDIAN__
else
memcpy(packet->m_data, data, size);
#else
size += size & 0x1;
SwapEndian((uint16_t*)packet->m_data, (uint16_t*)data, size >> 1);
#endif
unsigned int burstsize = period << 2;
memset(packet->m_data + size, 0, burstsize - IEC61937_DATA_OFFSET - size);
return burstsize;
}
int CAEPackIEC61937::PackDTS(uint8_t *data, unsigned int size, uint8_t *dest, bool littleEndian,
unsigned int frameSize, uint16_t type)
{
assert(size <= frameSize);
/* BE is the standard endianness, byteswap needed if LE */
bool byteSwapNeeded = littleEndian;
#ifndef __BIG_ENDIAN__
/* on LE systems we want LE output, byteswap needed */
byteSwapNeeded ^= true;
#endif
struct IEC61937Packet *packet = (struct IEC61937Packet*)dest;
uint8_t *dataTo;
if (size == frameSize)
{
/* No packing possible or needed, DTS stream is suitable for direct output */
dataTo = dest;
}
else if (size <= frameSize - IEC61937_DATA_OFFSET)
{
/* Fits to IEC61937, perform packing */
packet->m_preamble1 = IEC61937_PREAMBLE1;
packet->m_preamble2 = IEC61937_PREAMBLE2;
packet->m_type = type;
packet->m_length = size << 3;
dataTo = packet->m_data;
}
else
{
/* Stream is unsuitable for both packing and direct output */
return 0;
}
if (data == NULL)
data = dataTo;
else if (!byteSwapNeeded)
memcpy(dataTo, data, size);
if (byteSwapNeeded)
{
size += size & 0x1;
SwapEndian((uint16_t*)dataTo, (uint16_t*)data, size >> 1);
}
if (size != frameSize)
memset(packet->m_data + size, 0, frameSize - IEC61937_DATA_OFFSET - size);
return frameSize;
}
int CAEPackIEC61937::PackPause(uint8_t *dest, unsigned int millis, unsigned int framesize, unsigned int samplerate, unsigned int rep_period, unsigned int encodedRate)
{
int periodInBytes = rep_period * framesize;
double periodInTime = (double)rep_period / samplerate * 1000;
int periodsNeeded = millis / periodInTime;
int maxPeriods = MAX_IEC61937_PACKET / periodInBytes;
if (periodsNeeded > maxPeriods)
periodsNeeded = maxPeriods;
uint16_t gap = encodedRate * millis / 1000;
struct IEC61937Packet *packet = (struct IEC61937Packet*)dest;
packet->m_preamble1 = IEC61937_PREAMBLE1;
packet->m_preamble2 = IEC61937_PREAMBLE2;
packet->m_type = 3;
packet->m_length = 32;
memset(packet->m_data, 0, periodInBytes - 8);
for (int i=1; i<periodsNeeded; i++)
{
memcpy(dest+i*periodInBytes, dest, periodInBytes);
}
uint16_t *gapPtr = reinterpret_cast<uint16_t*>(packet->m_data);
*gapPtr = gap;
return periodsNeeded * periodInBytes;
}
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