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/*
* Copyright (C) 2010-2014 Hendrik Leppkes
* http://www.1f0.de
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define __STDC_CONSTANT_MACROS
// Exclude inline asm from being included
#define AVCODEC_X86_MATHOPS_H
extern "C" {
#pragma warning( push )
#pragma warning( disable : 4018 )
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#include "libavcodec/avcodec.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/dcadata.h"
#pragma warning( pop )
extern int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, int max_size);
extern __declspec(dllimport) const uint32_t avpriv_dca_sample_rates[16];
};
#include "dts.h"
#include "parser.h"
#include <vector>
struct DTSParserContext {
GetBitContext *gb;
};
int init_dts_parser(DTSParserContext **pContext)
{
if(!pContext) return -1;
*pContext = (DTSParserContext *)malloc(sizeof(DTSParserContext));
memset(*pContext, 0, sizeof(DTSParserContext));
if(!*pContext) return -1;
(*pContext)->gb = new GetBitContext();
return 0;
}
int close_dts_parser(DTSParserContext **pContext)
{
if(!pContext) return -1;
delete (*pContext)->gb;
free(*pContext);
*pContext = nullptr;
return 0;
}
static int parse_dts_xch_header(DTSParserContext *pContext, DTSHeader *pHeader, const uint8_t *pBuffer, unsigned uSize)
{
GetBitContext *gb = pContext->gb;
init_get_bits(gb, pBuffer, uSize << 3);
get_bits(gb, 32); /* DCA_XCH_MARKER */
get_bits(gb, 10); /* XCh Frame Size */
pHeader->XChChannelLayout = get_bits(gb, 4); /* Extension Channel Arrangement */
return 0;
}
static int parse_dts_xch_hd_header(DTSParserContext *pContext, DTSHeader *pHeader, const uint8_t *pBuffer, unsigned uSize)
{
GetBitContext *gb = pContext->gb;
init_get_bits(gb, pBuffer, uSize << 3);
/* Huh? */
pHeader->XChChannelLayout = 1;
return 0;
}
static int parse_dts_xxch_header(DTSParserContext *pContext, DTSHeader *pHeader, const uint8_t *pBuffer, unsigned uSize)
{
GetBitContext *gb = pContext->gb;
init_get_bits(gb, pBuffer, uSize << 3);
get_bits(gb, 32); /* DCA_XXCH_MARKER */
get_bits(gb, 8); /* ? */
pHeader->XChChannelLayout = get_bits(gb, 2); /* Channels Added? */
get_bits(gb, 6); /* ? */
return 0;
}
static int parse_dts_xxch_hd_header(DTSParserContext *pContext, DTSHeader *pHeader, const uint8_t *pBuffer, unsigned uSize)
{
GetBitContext *gb = pContext->gb;
init_get_bits(gb, pBuffer, uSize << 3);
get_bits(gb, 32); /* DCA_XXCH_MARKER */
get_bits(gb, 8); /* ? */
pHeader->XChChannelLayout = get_bits(gb, 2); /* Channels Added? */
get_bits(gb, 6); /* ? */
return 0;
}
static int parse_dts_hd_header(DTSParserContext *pContext, DTSHeader *pHeader, const uint8_t *pBuffer, unsigned uSize)
{
GetBitContext *gb = pContext->gb;
init_get_bits(gb, pBuffer, uSize << 3);
unsigned NumAudio = 1;
unsigned NumAssets = 1;
get_bits(gb, 32); /* DCA_HD_MARKER */
get_bits(gb, 8); /* Unknown */
unsigned SubIdx = get_bits(gb, 2); /* Substream Index */
unsigned blownUp = get_bits(gb, 1); /* Blown Up Header */
if (blownUp) {
get_bits(gb, 12); /* Header Size */
get_bits(gb, 20); /* HD Size */
} else {
get_bits(gb, 8); /* Header Size */
get_bits(gb, 16); /* HD Size */
}
unsigned staticFields = get_bits(gb, 1); /* Static fields present */
if (staticFields) {
std::vector<uint32_t> ActiveExSSMasks;
get_bits(gb, 2); /* Reference clock code */
get_bits(gb, 3); /* ExSS frame duration code */
if (get_bits(gb, 1)) /* Timestamp flag */
get_bits(gb, 36); /* Timestamp */
NumAudio = get_bits(gb, 3) + 1; /* Num audio present */
NumAssets = get_bits(gb, 3) + 1; /* Num assets */
for (uint8_t Pos = 0; Pos < NumAudio; Pos++) {
uint32_t mask = get_bits(gb, SubIdx+1); /* Active ExSS masks */
ActiveExSSMasks.push_back(mask);
}
for (uint8_t Pos = 0; Pos < NumAudio; Pos++)
for (uint8_t Pos2 = 0; Pos2<SubIdx+1; Pos2+=2)
if (ActiveExSSMasks[Pos]%2)
get_bits(gb, 8); /* Active ExSS masks 2 */
if (get_bits(gb, 1)) { /* Mix Metadata Flag */
get_bits(gb, 2); /* Mix Metadata Adjustment Level */
unsigned bits = get_bits(gb, 2); /* Bits4Mix Mask */
bits = 4 + bits * 4;
unsigned num = get_bits(gb, 2) + 1; /* Num Configs */
for (uint8_t Pos = 0; Pos < num; Pos++)
get_bits(gb, bits); /* Mix Out Ch Mask */
}
} /* END: Static Fields */
// Sizes
for (uint8_t Pos = 0; Pos < NumAssets; Pos++) {
if (blownUp) {
get_bits(gb, 20); /* Size */
} else {
get_bits(gb, 16); /* Size */
}
}
for (uint8_t Pos = 0; Pos < NumAssets; Pos++) {
get_bits(gb, 9); /* Asset Size */
get_bits(gb, 3); /* Asset Descriptor Data */
if (staticFields) {
if (get_bits(gb, 1)) /* Asset type descriptor present */
get_bits(gb, 4); /* Asset type descriptor */
if (get_bits(gb, 1)) /* Language descriptor present */
get_bits(gb, 24); /* Language descriptor */
if (get_bits(gb, 1)) { /* Info text present */
unsigned bytes = get_bits(gb, 10) + 1; /* Info text size */
for (unsigned Pos = 0; Pos < bytes; Pos++)
get_bits(gb, 8); /* Info Text */
}
get_bits(gb, 5); /* Bit Resolution */
get_bits(gb, 4); /* Maximum Sample Rate */
pHeader->HDTotalChannels = get_bits(gb, 8) + 1; /* Total Number of Channels */
if (get_bits(gb, 1)) { /* 1 to 1 speaker map present */
unsigned SpeakerActivityMaskBits = 0, SpeakerRemapSetsCount;
if (pHeader->HDTotalChannels > 2)
get_bits(gb, 1); /* Embedded stereo flag */
if (pHeader->HDTotalChannels > 6)
get_bits(gb, 1); /* Embedded 6 channels flag */
if (get_bits(gb, 1)) { /* Speaker Mask Flag */
SpeakerActivityMaskBits = get_bits(gb, 2); /* Speaker mask bits */
SpeakerActivityMaskBits = 4 + SpeakerActivityMaskBits * 4;
pHeader->HDSpeakerMask = get_bits(gb, SpeakerActivityMaskBits); /* Speaker activity Mask */
}
SpeakerRemapSetsCount = get_bits(gb, 3); /* Speaker remap sets count */
for (uint8_t Pos = 0; Pos < SpeakerRemapSetsCount; Pos++)
get_bits(gb, SpeakerActivityMaskBits); /* Standard Speaker Layout mask */
/* unfinished
for (uint8_t Pos = 0; Pos < SpeakerRemapSetsCount; Pos++)
get_bits(gb, 5); /* NumDecCh4Remap
*/
}
}
}
return 0;
}
int parse_dts_header(DTSParserContext *pContext, DTSHeader *pHeader, uint8_t *pBuffer, unsigned uSize)
{
if(!pContext) return -1;
if(!pHeader) return -1;
unsigned ExtDescriptor = 0, ExtCoding = 0;
uint8_t dts_buffer[32 + FF_INPUT_BUFFER_PADDING_SIZE] = {0};
int ret = avpriv_dca_convert_bitstream(pBuffer, uSize, dts_buffer, 32);
bool is16be = (AV_RB32(pBuffer) == DCA_MARKER_RAW_BE);
/* Parse Core Header */
if (ret >= 0) {
pHeader->HasCore = 1;
GetBitContext *gb = pContext->gb;
init_get_bits(gb, dts_buffer, 32 << 3);
skip_bits_long(gb, 32); /* Sync code */
skip_bits1(gb); /* Frame type */
pHeader->SamplesPerBlock = get_bits(gb, 5) + 1; /* Samples deficit */
pHeader->CRCPresent = get_bits1(gb); /* CRC present */
pHeader->Blocks = get_bits(gb, 7) + 1; /* Number of Blocks */
pHeader->FrameSize = get_bits(gb, 14) + 1; /* Primary (core) Frame Size */
pHeader->ChannelLayout = get_bits(gb, 6); /* Channel configuration */
unsigned sample_index = get_bits(gb, 4); /* Sample frequency index */
pHeader->SampleRate = avpriv_dca_sample_rates[sample_index];
unsigned bitrate_index = get_bits(gb, 5); /* Bitrate index */
pHeader->Bitrate = dca_bit_rates[bitrate_index];
skip_bits1(gb); /* Down mix */
skip_bits1(gb); /* Dynamic range */
skip_bits1(gb); /* Time stamp */
skip_bits1(gb); /* Auxiliary data */
skip_bits1(gb); /* HDCD */
ExtDescriptor = get_bits(gb, 3); /* External descriptor */
ExtCoding = get_bits1(gb); /* Extended coding */
skip_bits1(gb); /* ASPF */
pHeader->LFE = get_bits(gb, 2); /* LFE */
skip_bits1(gb); /* Predictor History */
if(pHeader->CRCPresent)
skip_bits(gb, 16); /* CRC */
skip_bits1(gb); /* Multirate Interpolator */
skip_bits(gb, 4); /* Encoder Software Revision */
skip_bits(gb, 2); /* Copy history */
pHeader->ES = get_bits1(gb); /* ES */
skip_bits(gb, 2); /* PCMR (source PCM resolution) */
skip_bits1(gb); /* SUMF (Front Sum/Difference Flag) */
skip_bits1(gb); /* SUMS (Surround Sum/Difference Flag) */
skip_bits(gb, 4); /* Dialog Normalization Parameter or Unspecified (dependent on encoder version) */
// Check some basic validity
if (uSize < pHeader->FrameSize)
return -1;
} else {
pHeader->HasCore = 0;
}
if (pHeader->HasCore && !is16be)
return 0;
// DTS-HD parsing
const uint8_t *pHD = nullptr;
if (pHeader->HasCore) { // If we have a core, only search after the normal buffer
if (uSize > (pHeader->FrameSize + 4)) { // at least 4 bytes extra, could probably insert a minimal size of a HD header, but so what
pHD = find_marker32_position(pBuffer + pHeader->FrameSize, uSize - pHeader->FrameSize, DCA_HD_MARKER);
}
} else {
pHD = find_marker32_position(pBuffer, uSize, DCA_HD_MARKER);
}
if (pHD) {
pHeader->IsHD = 1;
size_t remaining = uSize - (pHD - pBuffer);
parse_dts_hd_header(pContext, pHeader, pHD, (unsigned)remaining);
const uint8_t *pXChHD = find_marker32_position(pHD, remaining, DCA_XCH_MARKER);
if (pXChHD) {
size_t remaining = uSize - (pXChHD - pBuffer);
parse_dts_xch_hd_header(pContext, pHeader, pXChHD, (unsigned)remaining);
}
const uint8_t *pXXChHD = find_marker32_position(pHD, remaining, DCA_XXCH_MARKER);
if (pXXChHD) {
size_t remaining = uSize - (pXXChHD - pBuffer);
parse_dts_xxch_hd_header(pContext, pHeader, pXXChHD, (unsigned)remaining);
}
}
// Handle DTS extensions
if (ExtCoding) {
size_t coreSize = pHD ? (pHD - pBuffer) : uSize;
if (ExtDescriptor == 0 || ExtDescriptor == 3) {
const uint8_t *pXCh = find_marker32_position(pBuffer, coreSize, DCA_XCH_MARKER);
if (pXCh) {
size_t remaining = coreSize - (pXCh - pBuffer);
parse_dts_xch_header(pContext, pHeader, pXCh, (unsigned)remaining);
}
}
if (ExtDescriptor == 6) {
const uint8_t *pXXCh = find_marker32_position(pBuffer, coreSize, DCA_XXCH_MARKER);
if (pXXCh) {
size_t remaining = coreSize - (pXXCh - pBuffer);
parse_dts_xxch_header(pContext, pHeader, pXXCh, (unsigned)remaining);
}
}
}
return 0;
}
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