mirror of
https://github.com/hrydgard/ppsspp.git
synced 2024-11-24 14:00:03 +00:00
356 lines
8.1 KiB
C++
356 lines
8.1 KiB
C++
#include "Common/Serialize/SerializeFuncs.h"
|
|
#include "Core/HW/MpegDemux.h"
|
|
#include "Core/Reporting.h"
|
|
|
|
const int PACKET_START_CODE_MASK = 0xffffff00;
|
|
const int PACKET_START_CODE_PREFIX = 0x00000100;
|
|
|
|
// http://dvd.sourceforge.net/dvdinfo/mpeghdrs.html
|
|
|
|
const int USER_DATA_START_CODE = 0x000001b2;
|
|
const int SEQUENCE_START_CODE = 0x000001b3;
|
|
const int EXT_START_CODE = 0x000001b5;
|
|
const int SEQUENCE_END_CODE = 0x000001b7;
|
|
const int GOP_START_CODE = 0x000001b8;
|
|
const int ISO_11172_END_CODE = 0x000001b9;
|
|
const int PACK_START_CODE = 0x000001ba;
|
|
const int SYSTEM_HEADER_START_CODE = 0x000001bb;
|
|
const int PROGRAM_STREAM_MAP = 0x000001bc;
|
|
const int PRIVATE_STREAM_1 = 0x000001bd;
|
|
const int PADDING_STREAM = 0x000001be;
|
|
const int PRIVATE_STREAM_2 = 0x000001bf;
|
|
|
|
MpegDemux::MpegDemux(int size, int offset) : m_audioStream(size) {
|
|
m_buf = new u8[size];
|
|
|
|
m_len = size;
|
|
m_index = offset;
|
|
m_audioChannel = -1;
|
|
m_readSize = 0;
|
|
}
|
|
|
|
MpegDemux::~MpegDemux() {
|
|
delete [] m_buf;
|
|
}
|
|
|
|
void MpegDemux::DoState(PointerWrap &p) {
|
|
auto s = p.Section("MpegDemux", 1);
|
|
if (!s)
|
|
return;
|
|
|
|
Do(p, m_index);
|
|
Do(p, m_len);
|
|
Do(p, m_audioChannel);
|
|
Do(p, m_readSize);
|
|
if (m_buf)
|
|
DoArray(p, m_buf, m_len);
|
|
DoClass(p, m_audioStream);
|
|
}
|
|
|
|
bool MpegDemux::addStreamData(const u8 *buf, int addSize) {
|
|
if (m_readSize + addSize > m_len)
|
|
return false;
|
|
memcpy(m_buf + m_readSize, buf, addSize);
|
|
m_readSize += addSize;
|
|
return true;
|
|
}
|
|
|
|
int MpegDemux::readPesHeader(PesHeader &pesHeader, int length, int startCode) {
|
|
int c = 0;
|
|
while (length > 0) {
|
|
c = read8();
|
|
length--;
|
|
if (c != 0xFF) {
|
|
break;
|
|
}
|
|
}
|
|
if ((c & 0xC0) == 0x40) {
|
|
read8();
|
|
c = read8();
|
|
length -= 2;
|
|
}
|
|
pesHeader.pts = 0;
|
|
pesHeader.dts = 0;
|
|
if ((c & 0xE0) == 0x20) {
|
|
pesHeader.dts = pesHeader.pts = readPts(c);
|
|
length -= 4;
|
|
if ((c & 0x10) != 0) {
|
|
pesHeader.dts = readPts();
|
|
length -= 5;
|
|
}
|
|
} else if ((c & 0xC0) == 0x80) {
|
|
int flags = read8();
|
|
int headerLength = read8();
|
|
length -= 2;
|
|
length -= headerLength;
|
|
if ((flags & 0x80) != 0) {
|
|
pesHeader.dts = pesHeader.pts = readPts();
|
|
headerLength -= 5;
|
|
if ((flags & 0x40) != 0) {
|
|
pesHeader.dts = readPts();
|
|
headerLength -= 5;
|
|
}
|
|
}
|
|
if ((flags & 0x3F) != 0 && headerLength == 0) {
|
|
flags &= 0xC0;
|
|
}
|
|
if ((flags & 0x01) != 0) {
|
|
int pesExt = read8();
|
|
headerLength--;
|
|
int skip = (pesExt >> 4) & 0x0B;
|
|
skip += skip & 0x09;
|
|
if ((pesExt & 0x40) != 0 || skip > headerLength) {
|
|
pesExt = skip = 0;
|
|
}
|
|
this->skip(skip);
|
|
headerLength -= skip;
|
|
if ((pesExt & 0x01) != 0) {
|
|
int ext2Length = read8();
|
|
headerLength--;
|
|
if ((ext2Length & 0x7F) != 0) {
|
|
int idExt = read8();
|
|
headerLength--;
|
|
if ((idExt & 0x80) == 0) {
|
|
startCode = ((startCode & 0xFF) << 8) | idExt;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
skip(headerLength);
|
|
}
|
|
if (startCode == PRIVATE_STREAM_1) {
|
|
int channel = read8();
|
|
pesHeader.channel = channel;
|
|
length--;
|
|
if (channel >= 0x80 && channel <= 0xCF) {
|
|
// Skip audio header
|
|
skip(3);
|
|
length -= 3;
|
|
if (channel >= 0xB0 && channel <= 0xBF) {
|
|
skip(1);
|
|
length--;
|
|
}
|
|
} else {
|
|
// PSP audio has additional 3 bytes in header
|
|
skip(3);
|
|
length -= 3;
|
|
}
|
|
}
|
|
return length;
|
|
}
|
|
|
|
int MpegDemux::demuxStream(bool bdemux, int startCode, int length, int channel)
|
|
{
|
|
if (bdemux) {
|
|
PesHeader pesHeader(channel);
|
|
length = readPesHeader(pesHeader, length, startCode);
|
|
if (pesHeader.channel == channel || channel < 0) {
|
|
channel = pesHeader.channel;
|
|
m_audioStream.push(m_buf + m_index, length, pesHeader.pts);
|
|
}
|
|
skip(length);
|
|
} else {
|
|
skip(length);
|
|
}
|
|
return channel;
|
|
}
|
|
|
|
bool MpegDemux::skipPackHeader() {
|
|
// MPEG version / SCR
|
|
if ((read8() & 0xC4) != 0x44) {
|
|
return false;
|
|
}
|
|
skip(1);
|
|
if ((read8() & 0x04) != 0x04) {
|
|
return false;
|
|
}
|
|
skip(1);
|
|
if ((read8() & 0x04) != 0x04) {
|
|
return false;
|
|
}
|
|
// SCR_ext
|
|
if ((read8() & 0x01) != 0x01) {
|
|
return false;
|
|
}
|
|
|
|
int muxrate = read24();
|
|
if ((muxrate & 3) != 3) {
|
|
return false;
|
|
}
|
|
int stuffing = read8() & 7;
|
|
while (stuffing > 0) {
|
|
if (read8() != 0xFF) {
|
|
return false;
|
|
}
|
|
--stuffing;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool MpegDemux::demux(int audioChannel)
|
|
{
|
|
if (audioChannel >= 0)
|
|
m_audioChannel = audioChannel;
|
|
|
|
bool looksValid = false;
|
|
bool needMore = false;
|
|
while (m_index < m_readSize && !needMore)
|
|
{
|
|
// Search for start code
|
|
int startCode = 0xFF;
|
|
while ((startCode & PACKET_START_CODE_MASK) != PACKET_START_CODE_PREFIX && !isEOF()) {
|
|
startCode = (startCode << 8) | read8();
|
|
}
|
|
// Not enough data available yet.
|
|
if (m_readSize - m_index < 16) {
|
|
m_index -= 4;
|
|
break;
|
|
}
|
|
|
|
switch (startCode) {
|
|
case PACK_START_CODE:
|
|
if (skipPackHeader()) {
|
|
looksValid = true;
|
|
}
|
|
break;
|
|
case SYSTEM_HEADER_START_CODE: {
|
|
looksValid = true;
|
|
int length = read16();
|
|
if (m_readSize - m_index < length) {
|
|
m_index -= 4 + 2;
|
|
needMore = true;
|
|
break;
|
|
}
|
|
skip(length);
|
|
break;
|
|
}
|
|
case PADDING_STREAM:
|
|
case PRIVATE_STREAM_2: {
|
|
looksValid = true;
|
|
int length = read16();
|
|
if (m_readSize - m_index < length) {
|
|
m_index -= 4 + 2;
|
|
needMore = true;
|
|
break;
|
|
}
|
|
skip(length);
|
|
break;
|
|
}
|
|
case PRIVATE_STREAM_1: {
|
|
// Audio stream
|
|
int length = read16();
|
|
// Check for PES header marker.
|
|
looksValid = (m_buf[m_index] & 0xC0) == 0x80;
|
|
if (m_readSize - m_index < length) {
|
|
m_index -= 4 + 2;
|
|
needMore = true;
|
|
break;
|
|
}
|
|
m_audioChannel = demuxStream(true, startCode, length, m_audioChannel);
|
|
looksValid = true;
|
|
break;
|
|
}
|
|
case 0x1E0: case 0x1E1: case 0x1E2: case 0x1E3:
|
|
case 0x1E4: case 0x1E5: case 0x1E6: case 0x1E7:
|
|
case 0x1E8: case 0x1E9: case 0x1EA: case 0x1EB:
|
|
case 0x1EC: case 0x1ED: case 0x1EE: case 0x1EF: {
|
|
// Video Stream
|
|
int length = read16();
|
|
// Check for PES header marker.
|
|
looksValid = (m_buf[m_index] & 0xC0) == 0x80;
|
|
if (m_readSize - m_index < length) {
|
|
m_index -= 4 + 2;
|
|
needMore = true;
|
|
break;
|
|
}
|
|
demuxStream(false, startCode, length, -1);
|
|
break;
|
|
}
|
|
case USER_DATA_START_CODE:
|
|
// User data, probably same as queried by sceMpegGetUserdataAu.
|
|
// Not sure what exactly to do or how much to read.
|
|
// TODO: implement properly.
|
|
WARN_LOG_REPORT_ONCE(mpeguserdata, ME, "MPEG user data found");
|
|
looksValid = true;
|
|
break;
|
|
}
|
|
}
|
|
if (m_index < m_readSize) {
|
|
int size = m_readSize - m_index;
|
|
memmove(m_buf, m_buf + m_index, size);
|
|
m_index = 0;
|
|
m_readSize = size;
|
|
} else {
|
|
m_index = 0;
|
|
m_readSize = 0;
|
|
}
|
|
|
|
return looksValid;
|
|
}
|
|
|
|
static bool isHeader(const u8 *audioStream, int offset)
|
|
{
|
|
const u8 header1 = (u8)0x0F;
|
|
const u8 header2 = (u8)0xD0;
|
|
return (audioStream[offset] == header1) && (audioStream[offset+1] == header2);
|
|
}
|
|
|
|
static int getNextHeaderPosition(u8* audioStream, int curpos, int limit, int frameSize)
|
|
{
|
|
int endScan = limit - 1;
|
|
|
|
// Most common case: the header can be found at each frameSize
|
|
int offset = curpos + frameSize - 8;
|
|
if (offset < endScan && isHeader(audioStream, offset))
|
|
return offset;
|
|
for (int scan = curpos; scan < endScan; scan++) {
|
|
if (isHeader(audioStream, scan))
|
|
return scan;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int MpegDemux::getNextAudioFrame(u8 **buf, int *headerCode1, int *headerCode2, s64 *pts)
|
|
{
|
|
int gotsize;
|
|
int frameSize;
|
|
if (!hasNextAudioFrame(&gotsize, &frameSize, headerCode1, headerCode2))
|
|
return 0;
|
|
int audioPos = 8;
|
|
int nextHeader = getNextHeaderPosition(m_audioFrame, audioPos, gotsize, frameSize);
|
|
if (nextHeader >= 0) {
|
|
audioPos = nextHeader;
|
|
} else {
|
|
audioPos = gotsize;
|
|
}
|
|
m_audioStream.pop_front(0, audioPos, pts);
|
|
if (buf) {
|
|
*buf = m_audioFrame + 8;
|
|
}
|
|
return frameSize - 8;
|
|
}
|
|
|
|
bool MpegDemux::hasNextAudioFrame(int *gotsizeOut, int *frameSizeOut, int *headerCode1, int *headerCode2)
|
|
{
|
|
int gotsize = m_audioStream.get_front(m_audioFrame, 0x2000);
|
|
if (gotsize < 4 || !isHeader(m_audioFrame, 0))
|
|
return false;
|
|
u8 code1 = m_audioFrame[2];
|
|
u8 code2 = m_audioFrame[3];
|
|
int frameSize = (((code1 & 0x03) << 8) | (code2 * 8)) + 0x10;
|
|
if (frameSize > gotsize)
|
|
return false;
|
|
|
|
if (gotsizeOut)
|
|
*gotsizeOut = gotsize;
|
|
if (frameSizeOut)
|
|
*frameSizeOut = frameSize;
|
|
if (headerCode1)
|
|
*headerCode1 = code1;
|
|
if (headerCode2)
|
|
*headerCode2 = code2;
|
|
|
|
return true;
|
|
}
|