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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.
*
* Initial design and concept by Gabest and the MPC-HC Team, copyright under GPLv2
*/
#include "stdafx.h"
#include "StreamParser.h"
#include "OutputPin.h"
#include "H264Nalu.h"
#pragma warning( push )
#pragma warning( disable : 4018 )
#pragma warning( disable : 4244 )
extern "C" {
#define AVCODEC_X86_MATHOPS_H
#include "libavcodec/get_bits.h"
}
#pragma warning( pop )
#define AAC_ADTS_HEADER_SIZE 7
//#define DEBUG_PGS_PARSER
CStreamParser::CStreamParser(CLAVOutputPin *pPin, const char *szContainer)
: m_pPin(pPin), m_strContainer(szContainer)
{
}
CStreamParser::~CStreamParser()
{
Flush();
}
HRESULT CStreamParser::Parse(const GUID &gSubtype, Packet *pPacket)
{
if (gSubtype != m_gSubtype) {
m_gSubtype = gSubtype;
Flush();
}
if (!pPacket || (pPacket->dwFlags & LAV_PACKET_PARSED)) {
Queue(pPacket);
} else if (m_gSubtype == MEDIASUBTYPE_AVC1 && (m_strContainer == "mpegts" || pPacket->dwFlags & LAV_PACKET_H264_ANNEXB)) {
ParseH264AnnexB(pPacket);
} else if (m_gSubtype == MEDIASUBTYPE_HDMVSUB) {
ParsePGS(pPacket);
} else if (m_gSubtype == MEDIASUBTYPE_HDMV_LPCM_AUDIO) {
pPacket->RemoveHead(4);
Queue(pPacket);
} else if (m_gSubtype == MEDIASUBTYPE_DVD_LPCM_AUDIO) {
pPacket->RemoveHead(3);
Queue(pPacket);
} else if (pPacket->dwFlags & LAV_PACKET_MOV_TEXT) {
ParseMOVText(pPacket);
} else if (m_strContainer == "avi" && m_gSubtype == MEDIASUBTYPE_ASS) {
ParseRawSSA(pPacket);
} else if (m_gSubtype == MEDIASUBTYPE_AAC && (m_strContainer != "matroska" && m_strContainer != "mp4")) {
ParseAAC(pPacket);
} else if (m_gSubtype == MEDIASUBTYPE_UTF8 && (pPacket->dwFlags & LAV_PACKET_SRT)) {
ParseSRT(pPacket);
} else {
Queue(pPacket);
}
return S_OK;
}
HRESULT CStreamParser::Flush()
{
DbgLog((LOG_TRACE, 10, L"CStreamParser::Flush()"));
SAFE_DELETE(m_pPacketBuffer);
m_queue.Clear();
m_bPGSDropState = FALSE;
m_bHasAccessUnitDelimiters = false;
return S_OK;
}
HRESULT CStreamParser::Queue(Packet *pPacket) const
{
return m_pPin->QueueFromParser(pPacket);
}
static Packet *InitPacket(Packet *pSource)
{
Packet *pNew = nullptr;
pNew = new Packet();
pNew->StreamId = pSource->StreamId;
pNew->bDiscontinuity = pSource->bDiscontinuity;
pSource->bDiscontinuity = FALSE;
pNew->bSyncPoint = pSource->bSyncPoint;
pSource->bSyncPoint = FALSE;
pNew->rtStart = pSource->rtStart;
pSource->rtStart = Packet::INVALID_TIME;
pNew->rtStop = pSource->rtStop;
pSource->rtStop = Packet::INVALID_TIME;
pNew->pmt = pSource->pmt;
pSource->pmt = nullptr;
return pNew;
}
#define MOVE_TO_H264_START_CODE(b, e) while(b <= e-4 && !((*(DWORD *)b == 0x01000000) || ((*(DWORD *)b & 0x00FFFFFF) == 0x00010000))) b++; if((b <= e-4) && *(DWORD *)b == 0x01000000) b++;
HRESULT CStreamParser::ParseH264AnnexB(Packet *pPacket)
{
if (!m_pPacketBuffer) {
m_pPacketBuffer = InitPacket(pPacket);
}
m_pPacketBuffer->Append(pPacket);
BYTE *start = m_pPacketBuffer->GetData();
BYTE *end = start + m_pPacketBuffer->GetDataSize();
MOVE_TO_H264_START_CODE(start, end);
while(start <= end-4) {
BYTE *next = start + 1;
MOVE_TO_H264_START_CODE(next, end);
// End of buffer reached
if(next >= end-4) {
break;
}
size_t size = next - start;
CH264Nalu Nalu;
Nalu.SetBuffer(start, (int)size, 0);
Packet *p2 = nullptr;
while (Nalu.ReadNext()) {
Packet *p3 = new Packet();
p3->SetDataSize(Nalu.GetDataLength() + 4);
// Write size of the NALU (Big Endian)
AV_WB32(p3->GetData(), (uint32_t)Nalu.GetDataLength());
memcpy(p3->GetData() + 4, Nalu.GetDataBuffer(), Nalu.GetDataLength());
if (!p2) {
p2 = p3;
} else {
p2->Append(p3);
SAFE_DELETE(p3);
}
}
if (!p2)
break;
p2->StreamId = m_pPacketBuffer->StreamId;
p2->bDiscontinuity = m_pPacketBuffer->bDiscontinuity;
m_pPacketBuffer->bDiscontinuity = FALSE;
p2->bSyncPoint = m_pPacketBuffer->bSyncPoint;
m_pPacketBuffer->bSyncPoint = FALSE;
p2->rtStart = m_pPacketBuffer->rtStart;
m_pPacketBuffer->rtStart = Packet::INVALID_TIME;
p2->rtStop = m_pPacketBuffer->rtStop;
m_pPacketBuffer->rtStop = Packet::INVALID_TIME;
p2->pmt = m_pPacketBuffer->pmt;
m_pPacketBuffer->pmt = nullptr;
m_queue.Queue(p2);
if(pPacket->rtStart != Packet::INVALID_TIME) {
m_pPacketBuffer->rtStart = pPacket->rtStart;
m_pPacketBuffer->rtStop = pPacket->rtStop;
pPacket->rtStart = Packet::INVALID_TIME;
}
if(pPacket->bDiscontinuity) {
m_pPacketBuffer->bDiscontinuity = pPacket->bDiscontinuity;
pPacket->bDiscontinuity = FALSE;
}
if(pPacket->bSyncPoint) {
m_pPacketBuffer->bSyncPoint = pPacket->bSyncPoint;
pPacket->bSyncPoint = FALSE;
}
if(m_pPacketBuffer->pmt) {
DeleteMediaType(m_pPacketBuffer->pmt);
}
m_pPacketBuffer->pmt = pPacket->pmt;
pPacket->pmt = nullptr;
start = next;
}
if(start > m_pPacketBuffer->GetData()) {
m_pPacketBuffer->RemoveHead(start - m_pPacketBuffer->GetData());
}
SAFE_DELETE(pPacket);
do {
pPacket = nullptr;
REFERENCE_TIME rtStart = Packet::INVALID_TIME, rtStop = rtStart = Packet::INVALID_TIME;
std::deque<Packet *>::iterator it;
for (it = m_queue.GetQueue()->begin(); it != m_queue.GetQueue()->end(); ++it) {
// Skip the first
if (it == m_queue.GetQueue()->begin()) {
continue;
}
Packet *p = *it;
BYTE* pData = p->GetData();
if((pData[4]&0x1f) == 0x09) {
m_bHasAccessUnitDelimiters = true;
}
if ((pData[4]&0x1f) == 0x09 || (!m_bHasAccessUnitDelimiters && p->rtStart != Packet::INVALID_TIME)) {
pPacket = p;
if (p->rtStart == Packet::INVALID_TIME && rtStart != Packet::INVALID_TIME) {
p->rtStart = rtStart;
p->rtStop = rtStop;
}
break;
}
if (rtStart == Packet::INVALID_TIME) {
rtStart = p->rtStart;
rtStop = p->rtStop;
}
}
if (pPacket) {
Packet *p = m_queue.Get();
Packet *p2 = nullptr;
while ((p2 = m_queue.Get()) != pPacket) {
p->Append(p2);
SAFE_DELETE(p2);
}
// Return
m_queue.GetQueue()->push_front(pPacket);
Queue(p);
}
} while (pPacket != nullptr);
return S_OK;
}
HRESULT CStreamParser::ParsePGS(Packet *pPacket)
{
const uint8_t *buf = pPacket->GetData();
const size_t buf_size = pPacket->GetDataSize();
const uint8_t *buf_end = buf + buf_size;
uint8_t segment_type;
size_t segment_length;
if (buf_size < 3) {
DbgLog((LOG_TRACE, 30, L"::ParsePGS(): Way too short PGS packet"));
goto done;
}
m_pgsBuffer.SetSize(0);
while((buf + 3) <= buf_end) {
const uint8_t *segment_start = buf;
const size_t segment_buf_len = buf_end - buf;
segment_type = AV_RB8(buf);
segment_length = AV_RB16(buf+1);
if (segment_length > (segment_buf_len - 3)) {
DbgLog((LOG_TRACE, 10, "::ParsePGS(): segment_length bigger then input buffer: %d (buffer: %d)", segment_length, segment_buf_len));
segment_length = segment_buf_len - 3;
}
buf += 3;
#ifdef DEBUG_PGS_PARSER
DbgLog((LOG_TRACE, 50, L"::ParsePGS(): segment_type: 0x%x, segment_length: %d", segment_type, segment_length));
#endif
// Presentation segment
if (segment_type == 0x16 && segment_length > 10) {
// Segment Layout
// 2 bytes width
// 2 bytes height
// 1 unknown byte
// 2 bytes id
// 1 byte composition state (0x00 = normal, 0x40 = ACQU_POINT (?), 0x80 = epoch start (new frame), 0xC0 = epoch continue)
// 2 unknown bytes
// 1 byte object number
uint8_t objectNumber = buf[10];
// 2 bytes object ref id
if (objectNumber == 0) {
m_bPGSDropState = FALSE;
} else if (segment_length >= 0x13) {
// 1 byte window_id
// 1 byte object_cropped_flag: 0x80, forced_on_flag = 0x040, 6bit reserved
uint8_t forced_flag = buf[14];
m_bPGSDropState = !(forced_flag & 0x40);
// 2 bytes x
// 2 bytes y
// total length = 19 bytes
}
#ifdef DEBUG_PGS_PARSER
DbgLog((LOG_TRACE, 50, L"::ParsePGS(): Presentation Segment! obj.num: %d; state: 0x%x; dropping: %d", objectNumber, buf[7], m_bPGSDropState));
#endif
}
if (!m_bPGSDropState) {
m_pgsBuffer.Append(segment_start, (DWORD)(segment_length + 3));
}
buf += segment_length;
}
if (m_pgsBuffer.GetCount() > 0) {
pPacket->SetData(m_pgsBuffer.Ptr(), m_pgsBuffer.GetCount());
} else {
delete pPacket;
return S_OK;
}
done:
return Queue(pPacket);
}
HRESULT CStreamParser::ParseMOVText(Packet *pPacket)
{
size_t avail = pPacket->GetDataSize();
BYTE *ptr = pPacket->GetData();
if (avail > 2) {
unsigned size = (ptr[0] << 8) | ptr[1];
if (size <= avail-2) {
pPacket->RemoveHead(2);
pPacket->SetDataSize(size);
return Queue(pPacket);
}
}
SAFE_DELETE(pPacket);
return S_FALSE;
}
static int ass_get_duration(const char *p)
{
int sh, sm, ss, sc, eh, em, es, ec;
uint64_t start, end;
if (sscanf_s(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
&sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
return 0;
start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
end = 3600000*eh + 60000*em + 1000*es + 10*ec;
return (int)(end - start);
}
HRESULT CStreamParser::ParseRawSSA(Packet *pPacket)
{
int i, layer = 0, max_duration = 0;
size_t size, line_size, data_size = pPacket->GetDataSize();
const char *start, *end, *data = (char *)pPacket->GetData();
char buffer[2048];
while(data_size) {
int duration = ass_get_duration(data);
max_duration = FFMAX(duration, max_duration);
end = (char *)memchr(data, '\n', data_size);
size = line_size = end ? end-data+1 : data_size;
size -= end ? (end[-1]=='\r')+1 : 0;
start = data;
for (i=0; i<3; i++, start++)
if (!(start = (char *)memchr(start, ',', size-(start-data))))
break;
size -= start - data;
// ASS packages with layer
sscanf_s(data, "Dialogue: %d,", &layer);
i = _snprintf_s(buffer, sizeof(buffer), "%I64d,%d,", 0, layer);
size = FFMIN(i+size, sizeof(buffer));
memcpy(buffer+i, start, size-i);
Packet *p = new Packet();
p->pmt = pPacket->pmt; pPacket->pmt = nullptr;
p->bDiscontinuity = pPacket->bDiscontinuity;
p->bSyncPoint = pPacket->bSyncPoint;
p->StreamId = pPacket->StreamId;
p->rtStart = pPacket->rtStart;
p->rtStop = p->rtStart + (duration * 10000);
p->AppendData(buffer, size);
Queue(p);
data += line_size;
data_size -= line_size;
}
SAFE_DELETE(pPacket);
return S_FALSE;
}
HRESULT CStreamParser::ParseAAC(Packet *pPacket)
{
BYTE *pData = pPacket->GetData();
GetBitContext gb;
init_get_bits(&gb, pData, AAC_ADTS_HEADER_SIZE*8);
// Check if its really ADTS
if (get_bits(&gb, 12) == 0xfff) {
skip_bits1(&gb); /* id */
skip_bits(&gb, 2); /* layer */
int crc_abs = get_bits1(&gb); /* protection_absent */
pPacket->RemoveHead(AAC_ADTS_HEADER_SIZE + 2*!crc_abs);
}
return Queue(pPacket);
}
static const char *read_srt_ts(const char *buf, int *ts_start, int *ts_end, int *x1, int *y1, int *x2, int *y2)
{
int i, hs, ms, ss, he, me, se;
for (i=0; i<2; i++) {
/* try to read timestamps in either the first or second line */
int c = sscanf_s(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
"%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
&hs, &ms, &ss, ts_start, &he, &me, &se, ts_end,
x1, x2, y1, y2);
buf += strcspn(buf, "\n") + 1;
if (c >= 8) {
*ts_start = 100*(ss + 60*(ms + 60*hs)) + *ts_start/10;
*ts_end = 100*(se + 60*(me + 60*he)) + *ts_end /10;
return buf;
}
}
return nullptr;
}
HRESULT CStreamParser::ParseSRT(Packet *pPacket)
{
int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1;
const char *ptr = (const char *)pPacket->GetData();
const char *end = ptr + pPacket->GetDataSize();
if (pPacket->GetDataSize() == 0)
return S_FALSE;
while(ptr && end > ptr && *ptr) {
// Read the embeded timestamp and find the start of the subtitle
ptr = read_srt_ts(ptr, &ts_start, &ts_end, &x1, &y1, &x2, &y2);
if (ptr) {
const char *linestart = ptr;
while (end > ptr) {
if (*ptr != ' ' && *ptr != '\n' && *ptr != '\r') {
ptr += strcspn(ptr, "\n") + 1;
} else {
if (*ptr++ == '\n')
break;
}
}
int size = ptr - linestart;
Packet *p = new Packet();
p->pmt = pPacket->pmt; pPacket->pmt = nullptr;
p->bDiscontinuity = pPacket->bDiscontinuity;
p->bSyncPoint = pPacket->bSyncPoint;
p->StreamId = pPacket->StreamId;
p->rtStart = pPacket->rtStart;
p->rtStop = pPacket->rtStop;
p->AppendData(linestart, size);
Queue(p);
}
}
SAFE_DELETE(pPacket);
return S_FALSE;
}
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