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sdk-hwV1.3/external/eyesee-mpp/system/private/rtsp/liveMedia/OggFileParser.cpp

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/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
This library 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 Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
**********/
// "liveMedia"
// Copyright (c) 1996-2016 Live Networks, Inc. All rights reserved.
// A parser for an Ogg file.
// Implementation
#include "OggFileParser.hh"
#include "OggDemuxedTrack.hh"
#include <GroupsockHelper.hh> // for "gettimeofday()
PacketSizeTable::PacketSizeTable(unsigned number_page_segments)
: numCompletedPackets(0), totSizes(0), nextPacketNumToDeliver(0),
lastPacketIsIncomplete(False) {
size = new unsigned[number_page_segments];
for (unsigned i = 0; i < number_page_segments; ++i) size[i] = 0;
}
PacketSizeTable::~PacketSizeTable() {
delete[] size;
}
OggFileParser::OggFileParser(OggFile& ourFile, FramedSource* inputSource,
FramedSource::onCloseFunc* onEndFunc, void* onEndClientData,
OggDemux* ourDemux)
: StreamParser(inputSource, onEndFunc, onEndClientData, continueParsing, this),
fOurFile(ourFile), fInputSource(inputSource),
fOnEndFunc(onEndFunc), fOnEndClientData(onEndClientData),
fOurDemux(ourDemux), fNumUnfulfilledTracks(0),
fPacketSizeTable(NULL), fCurrentTrackNumber(0), fSavedPacket(NULL) {
if (ourDemux == NULL) {
// Initialization
fCurrentParseState = PARSING_START_OF_FILE;
continueParsing();
} else {
fCurrentParseState = PARSING_AND_DELIVERING_PAGES;
// In this case, parsing (of page data) doesn't start until a client starts reading from a track.
}
}
OggFileParser::~OggFileParser() {
delete[] fSavedPacket;
delete fPacketSizeTable;
Medium::close(fInputSource);
}
void OggFileParser::continueParsing(void* clientData, unsigned char* ptr, unsigned size, struct timeval presentationTime) {
((OggFileParser*)clientData)->continueParsing();
}
void OggFileParser::continueParsing() {
if (fInputSource != NULL) {
if (fInputSource->isCurrentlyAwaitingData()) return;
// Our input source is currently being read. Wait until that read completes
if (!parse()) {
// We didn't complete the parsing, because we had to read more data from the source,
// or because we're waiting for another read from downstream.
// Once that happens, we'll get called again.
return;
}
}
// We successfully parsed the file. Call our 'done' function now:
if (fOnEndFunc != NULL) (*fOnEndFunc)(fOnEndClientData);
}
Boolean OggFileParser::parse() {
try {
while (1) {
switch (fCurrentParseState) {
case PARSING_START_OF_FILE: {
if (parseStartOfFile()) return True;
}
case PARSING_AND_DELIVERING_PAGES: {
parseAndDeliverPages();
}
case DELIVERING_PACKET_WITHIN_PAGE: {
if (deliverPacketWithinPage()) return False;
}
}
}
} catch (int /*e*/) {
#ifdef DEBUG
fprintf(stderr, "OggFileParser::parse() EXCEPTION (This is normal behavior - *not* an error)\n");
#endif
return False; // the parsing got interrupted
}
}
Boolean OggFileParser::parseStartOfFile() {
#ifdef DEBUG
fprintf(stderr, "parsing start of file\n");
#endif
// Read and parse each 'page', until we see the first non-BOS page, or until we have
// collected all required headers for Vorbis, Theora, or Opus track(s) (if any).
u_int8_t header_type_flag;
do {
header_type_flag = parseInitialPage();
} while ((header_type_flag&0x02) != 0 || needHeaders());
#ifdef DEBUG
fprintf(stderr, "Finished parsing start of file\n");
#endif
return True;
}
static u_int32_t byteSwap(u_int32_t x) {
return (x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24);
}
u_int8_t OggFileParser::parseInitialPage() {
u_int8_t header_type_flag;
u_int32_t bitstream_serial_number;
parseStartOfPage(header_type_flag, bitstream_serial_number);
// If this is a BOS page, examine the first 8 bytes of the first 'packet', to see whether
// the track data type is one that we know how to stream:
OggTrack* track;
if ((header_type_flag&0x02) != 0) { // BOS
char const* mimeType = NULL; // if unknown
if (fPacketSizeTable != NULL && fPacketSizeTable->size[0] >= 8) { // sanity check
char buf[8];
testBytes((u_int8_t*)buf, 8);
if (strncmp(&buf[1], "vorbis", 6) == 0) {
mimeType = "audio/VORBIS";
++fNumUnfulfilledTracks;
} else if (strncmp(buf, "OpusHead", 8) == 0) {
mimeType = "audio/OPUS";
++fNumUnfulfilledTracks;
} else if (strncmp(&buf[1], "theora", 6) == 0) {
mimeType = "video/THEORA";
++fNumUnfulfilledTracks;
}
}
// Add a new track descriptor for this track:
track = new OggTrack;
track->trackNumber = bitstream_serial_number;
track->mimeType = mimeType;
fOurFile.addTrack(track);
} else { // not a BOS page
// Because this is not a BOS page, the specified track should already have been seen:
track = fOurFile.lookup(bitstream_serial_number);
}
if (track != NULL) { // sanity check
#ifdef DEBUG
fprintf(stderr, "This track's MIME type: %s\n",
track->mimeType == NULL ? "(unknown)" : track->mimeType);
#endif
if (track->mimeType != NULL &&
(strcmp(track->mimeType, "audio/VORBIS") == 0 ||
strcmp(track->mimeType, "video/THEORA") == 0 ||
strcmp(track->mimeType, "audio/OPUS") == 0)) {
// Special-case handling of Vorbis, Theora, or Opus tracks:
// Make a copy of each packet, until we get the three special headers that we need:
Boolean isVorbis = strcmp(track->mimeType, "audio/VORBIS") == 0;
Boolean isTheora = strcmp(track->mimeType, "video/THEORA") == 0;
for (unsigned j = 0; j < fPacketSizeTable->numCompletedPackets && track->weNeedHeaders(); ++j) {
unsigned const packetSize = fPacketSizeTable->size[j];
if (packetSize == 0) continue; // sanity check
delete[] fSavedPacket/*if any*/; fSavedPacket = new u_int8_t[packetSize];
getBytes(fSavedPacket, packetSize);
fPacketSizeTable->totSizes -= packetSize;
// The start of the packet tells us whether its a header that we know about:
Boolean headerIsKnown = False;
unsigned index = 0;
if (isVorbis) {
u_int8_t const firstByte = fSavedPacket[0];
headerIsKnown = firstByte == 1 || firstByte == 3 || firstByte == 5;
index = (firstByte-1)/2; // 1, 3, or 5 => 0, 1, or 2
} else if (isTheora) {
u_int8_t const firstByte = fSavedPacket[0];
headerIsKnown = firstByte == 0x80 || firstByte == 0x81 || firstByte == 0x82;
index = firstByte &~0x80; // 0x80, 0x81, or 0x82 => 0, 1, or 2
} else { // Opus
if (strncmp((char const*)fSavedPacket, "OpusHead", 8) == 0) {
headerIsKnown = True;
index = 0; // "identification" header
} else if (strncmp((char const*)fSavedPacket, "OpusTags", 8) == 0) {
headerIsKnown = True;
index = 1; // "comment" header
}
}
if (headerIsKnown) {
#ifdef DEBUG
char const* headerName[3] = { "identification", "comment", "setup" };
fprintf(stderr, "Saved %d-byte %s \"%s\" header\n", packetSize, track->mimeType,
headerName[index]);
#endif
// This is a header, but first check it for validity:
if (!validateHeader(track, fSavedPacket, packetSize)) continue;
// Save this header (deleting any old header of the same type that we'd saved before)
delete[] track->vtoHdrs.header[index];
track->vtoHdrs.header[index] = fSavedPacket;
fSavedPacket = NULL;
track->vtoHdrs.headerSize[index] = packetSize;
if (!track->weNeedHeaders()) {
// We now have all of the needed Vorbis, Theora, or Opus headers for this track:
--fNumUnfulfilledTracks;
}
// Note: The above code won't work if a required header is fragmented over
// more than one 'page'. We assume that that won't ever happen...
}
}
}
}
// Skip over any remaining packet data bytes:
if (fPacketSizeTable->totSizes > 0) {
#ifdef DEBUG
fprintf(stderr, "Skipping %d remaining packet data bytes\n", fPacketSizeTable->totSizes);
#endif
skipBytes(fPacketSizeTable->totSizes);
}
return header_type_flag;
}
// A simple bit vector class for reading bits in little-endian order.
// (We can't use our usual "BitVector" class, because that's big-endian.)
class LEBitVector {
public:
LEBitVector(u_int8_t const* p, unsigned numBytes)
: fPtr(p), fEnd(&p[numBytes]), fNumBitsRemainingInCurrentByte(8) {
}
u_int32_t getBits(unsigned numBits/*<=32*/) {
if (noMoreBits()) {
return 0;
} else if (numBits == fNumBitsRemainingInCurrentByte) {
u_int32_t result = (*fPtr++)>>(8-fNumBitsRemainingInCurrentByte);
fNumBitsRemainingInCurrentByte = 8;
return result;
} else if (numBits < fNumBitsRemainingInCurrentByte) {
u_int8_t mask = 0xFF>>(8-numBits);
u_int32_t result = ((*fPtr)>>(8-fNumBitsRemainingInCurrentByte)) & mask;
fNumBitsRemainingInCurrentByte -= numBits;
return result;
} else { // numBits > fNumBitsRemainingInCurrentByte
// Do two recursive calls to get the result:
unsigned nbr = fNumBitsRemainingInCurrentByte;
u_int32_t firstBits = getBits(nbr);
u_int32_t nextBits = getBits(numBits - nbr);
return (nextBits<<nbr) | firstBits;
}
}
void skipBits(unsigned numBits) {
while (numBits > 32) {
(void)getBits(32);
numBits -= 32;
}
(void)getBits(numBits);
}
unsigned numBitsRemaining() { return (fEnd-fPtr-1)*8 + fNumBitsRemainingInCurrentByte; }
Boolean noMoreBits() const { return fPtr >= fEnd; }
private:
u_int8_t const* fPtr;
u_int8_t const* fEnd;
unsigned fNumBitsRemainingInCurrentByte; // 1..8
};
static unsigned ilog(int n) {
if (n < 0) return 0;
unsigned x = (unsigned)n;
unsigned result = 0;
while (x > 0) {
++result;
x >>= 1;
}
return result;
}
static unsigned lookup1_values(unsigned codebook_entries, unsigned codebook_dimensions) {
// "the greatest integer value for which [return_value] to the power of [codebook_dimensions]
// is less than or equal to [codebook_entries]"
unsigned return_value = 0;
unsigned powerValue;
do {
++return_value;
// Compute powerValue = return_value ** codebook_dimensions
if (return_value == 1) powerValue = 1; // optimization
else {
powerValue = 1;
for (unsigned i = 0; i < codebook_dimensions; ++i) {
powerValue *= return_value;
}
}
} while (powerValue <= codebook_entries);
return_value -= 1;
return return_value;
}
static Boolean parseVorbisSetup_codebook(LEBitVector& bv) {
if (bv.noMoreBits()) return False;
unsigned sync = bv.getBits(24);
if (sync != 0x564342) return False;
unsigned codebook_dimensions = bv.getBits(16);
unsigned codebook_entries = bv.getBits(24);
unsigned ordered = bv.getBits(1);
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\t\t\tcodebook_dimensions: %d; codebook_entries: %d, ordered: %d\n",
codebook_dimensions, codebook_entries, ordered);
#endif
if (!ordered) {
unsigned sparse = bv.getBits(1);
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\t\t\t!ordered: sparse %d\n", sparse);
#endif
for (unsigned i = 0; i < codebook_entries; ++i) {
unsigned codewordLength;
if (sparse) {
unsigned flag = bv.getBits(1);
if (flag) {
codewordLength = bv.getBits(5) + 1;
} else {
codewordLength = 0;
}
} else {
codewordLength = bv.getBits(5) + 1;
}
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\t\t\t\tcodeword length[%d]:\t%d\n", i, codewordLength);
#else
codewordLength = codewordLength; // to prevent compiler warning
#endif
}
} else { // ordered
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\t\t\tordered:\n");
#endif
unsigned current_entry = 0;
unsigned current_length = bv.getBits(5) + 1;
do {
unsigned number = bv.getBits(ilog(codebook_entries - current_entry));
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\t\t\t\tcodeword length[%d..%d]:\t%d\n",
current_entry, current_entry + number - 1, current_length);
#endif
current_entry += number;
if (current_entry > codebook_entries) {
fprintf(stderr, "Vorbis codebook parsing error: current_entry %d > codebook_entries %d!\n", current_entry, codebook_entries);
return False;
}
++current_length;
} while (current_entry < codebook_entries);
}
unsigned codebook_lookup_type = bv.getBits(4);
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\t\t\tcodebook_lookup_type: %d\n", codebook_lookup_type);
#endif
if (codebook_lookup_type > 2) {
fprintf(stderr, "Vorbis codebook parsing error: codebook_lookup_type %d!\n", codebook_lookup_type);
return False;
} else if (codebook_lookup_type > 0) { // 1 or 2
bv.skipBits(32+32); // "codebook_minimum_value" and "codebook_delta_value"
unsigned codebook_value_bits = bv.getBits(4) + 1;
bv.skipBits(1); // "codebook_lookup_p"
unsigned codebook_lookup_values;
if (codebook_lookup_type == 1) {
codebook_lookup_values = lookup1_values(codebook_entries, codebook_dimensions);
} else { // 2
codebook_lookup_values = codebook_entries*codebook_dimensions;
}
bv.skipBits(codebook_lookup_values*codebook_value_bits); // "codebook_multiplicands"
}
return True;
}
static Boolean parseVorbisSetup_codebooks(LEBitVector& bv) {
if (bv.noMoreBits()) return False;
unsigned vorbis_codebook_count = bv.getBits(8) + 1;
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\tCodebooks: vorbis_codebook_count: %d\n", vorbis_codebook_count);
#endif
for (unsigned i = 0; i < vorbis_codebook_count; ++i) {
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\t\tCodebook %d:\n", i);
#endif
if (!parseVorbisSetup_codebook(bv)) return False;
}
return True;
}
static Boolean parseVorbisSetup_timeDomainTransforms(LEBitVector& bv) {
if (bv.noMoreBits()) return False;
unsigned vorbis_time_count = bv.getBits(6) + 1;
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\tTime domain transforms: vorbis_time_count: %d\n", vorbis_time_count);
#endif
for (unsigned i = 0; i < vorbis_time_count; ++i) {
unsigned val = bv.getBits(16);
if (val != 0) {
fprintf(stderr, "Vorbis Time domain transforms, read non-zero value %d\n", val);
return False;
}
}
return True;
}
static Boolean parseVorbisSetup_floors(LEBitVector& bv) {
if (bv.noMoreBits()) return False;
unsigned vorbis_floor_count = bv.getBits(6) + 1;
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\tFloors: vorbis_floor_count: %d\n", vorbis_floor_count);
#endif
for (unsigned i = 0; i < vorbis_floor_count; ++i) {
unsigned floorType = bv.getBits(16);
if (floorType == 0) {
bv.skipBits(8+16+16+6+8);
unsigned floor0_number_of_books = bv.getBits(4) + 1;
bv.skipBits(floor0_number_of_books*8);
} else if (floorType == 1) {
unsigned floor1_partitions = bv.getBits(5);
unsigned* floor1_partition_class_list = new unsigned[floor1_partitions];
unsigned maximum_class = 0, j;
for (j = 0; j < floor1_partitions; ++j) {
floor1_partition_class_list[j] = bv.getBits(4);
if (floor1_partition_class_list[j] > maximum_class) maximum_class = floor1_partition_class_list[j];
}
unsigned* floor1_class_dimensions = new unsigned[maximum_class + 1];
for (j = 0; j <= maximum_class; ++j) {
floor1_class_dimensions[j] = bv.getBits(3) + 1;
unsigned floor1_class_subclasses = bv.getBits(2);
if (floor1_class_subclasses != 0) {
bv.skipBits(8); // "floor1_class_masterbooks[j]"
}
unsigned twoExp_floor1_class_subclasses = 1 << floor1_class_subclasses;
bv.skipBits(twoExp_floor1_class_subclasses*8); // "floor1_subclass_books[j][*]"
}
bv.skipBits(2); // "floor1_multiplier"
unsigned rangebits = bv.getBits(4);
for (j = 0; j < floor1_partitions; ++j) {
unsigned current_class_number = floor1_partition_class_list[j];
bv.skipBits(floor1_class_dimensions[current_class_number] * rangebits);
}
delete[] floor1_partition_class_list;
delete[] floor1_class_dimensions;
} else { // floorType > 1
fprintf(stderr, "Vorbis Floors, read bad floor type %d\n", floorType);
return False;
}
}
return True;
}
static Boolean parseVorbisSetup_residues(LEBitVector& bv) {
if (bv.noMoreBits()) return False;
unsigned vorbis_residue_count = bv.getBits(6) + 1;
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\tResidues: vorbis_residue_count: %d\n", vorbis_residue_count);
#endif
for (unsigned i = 0; i < vorbis_residue_count; ++i) {
unsigned vorbis_residue_type = bv.getBits(16);
if (vorbis_residue_type > 2) {
fprintf(stderr, "Vorbis Residues, read bad vorbis_residue_type: %d\n", vorbis_residue_type);
return False;
} else {
bv.skipBits(24+24+24); // "residue_begin", "residue_end", "residue_partition_size"
unsigned residue_classifications = bv.getBits(6) + 1;
bv.skipBits(8); // "residue_classbook"
u_int8_t* residue_cascade = new u_int8_t[residue_classifications];
unsigned j;
for (j = 0; j < residue_classifications; ++j) {
u_int8_t high_bits = 0;
u_int8_t low_bits = bv.getBits(3);
unsigned bitflag = bv.getBits(1);
if (bitflag) {
high_bits = bv.getBits(5);
}
residue_cascade[j] = (high_bits<<3) | low_bits;
}
for (j = 0; j < residue_classifications; ++j) {
u_int8_t const cascade = residue_cascade[j];
u_int8_t mask = 0x80;
while (mask != 0) {
if ((cascade&mask) != 0) bv.skipBits(8); // "residue_books[j][*]"
mask >>= 1;
}
}
delete[] residue_cascade;
}
}
return True;
}
static Boolean parseVorbisSetup_mappings(LEBitVector& bv, unsigned audio_channels) {
if (bv.noMoreBits()) return False;
unsigned vorbis_mapping_count = bv.getBits(6) + 1;
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\tMappings: vorbis_mapping_count: %d\n", vorbis_mapping_count);
#endif
for (unsigned i = 0; i < vorbis_mapping_count; ++i) {
unsigned vorbis_mapping_type = bv.getBits(16);
if (vorbis_mapping_type != 0) {
fprintf(stderr, "Vorbis Mappings, read bad vorbis_mapping_type: %d\n", vorbis_mapping_type);
return False;
}
unsigned vorbis_mapping_submaps = 1;
if (bv.getBits(1)) vorbis_mapping_submaps = bv.getBits(4) + 1;
if (bv.getBits(1)) { // "square polar channel mapping is in use"
unsigned vorbis_mapping_coupling_steps = bv.getBits(8) + 1;
for (unsigned j = 0; j < vorbis_mapping_coupling_steps; ++j) {
unsigned ilog_audio_channels_minus_1 = ilog(audio_channels - 1);
bv.skipBits(2*ilog_audio_channels_minus_1); // "vorbis_mapping_magnitude", "vorbis_mapping_angle"
}
}
unsigned reserved = bv.getBits(2);
if (reserved != 0) {
fprintf(stderr, "Vorbis Mappings, read bad 'reserved' field\n");
return False;
}
if (vorbis_mapping_submaps > 1) {
for (unsigned j = 0; j < audio_channels; ++j) {
unsigned vorbis_mapping_mux = bv.getBits(4);
fprintf(stderr, "\t\t\t\tvorbis_mapping_mux[%d]: %d\n", j, vorbis_mapping_mux);
if (vorbis_mapping_mux >= vorbis_mapping_submaps) {
fprintf(stderr, "Vorbis Mappings, read bad \"vorbis_mapping_mux\" %d (>= \"vorbis_mapping_submaps\" %d)\n", vorbis_mapping_mux, vorbis_mapping_submaps);
return False;
}
}
}
bv.skipBits(vorbis_mapping_submaps*(8+8+8)); // "the floor and residue numbers"
}
return True;
}
static Boolean parseVorbisSetup_modes(LEBitVector& bv, OggTrack* track) {
if (bv.noMoreBits()) return False;
unsigned vorbis_mode_count = bv.getBits(6) + 1;
unsigned ilog_vorbis_mode_count_minus_1 = ilog(vorbis_mode_count - 1);
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\tModes: vorbis_mode_count: %d (ilog(%d-1):%d)\n",
vorbis_mode_count, vorbis_mode_count, ilog_vorbis_mode_count_minus_1);
#endif
track->vtoHdrs.vorbis_mode_count = vorbis_mode_count;
track->vtoHdrs.ilog_vorbis_mode_count_minus_1 = ilog_vorbis_mode_count_minus_1;
track->vtoHdrs.vorbis_mode_blockflag = new u_int8_t[vorbis_mode_count];
for (unsigned i = 0; i < vorbis_mode_count; ++i) {
track->vtoHdrs.vorbis_mode_blockflag[i] = (u_int8_t)bv.getBits(1);
#ifdef DEBUG_SETUP_HEADER
fprintf(stderr, "\t\tMode %d: vorbis_mode_blockflag: %d\n", i, track->vtoHdrs.vorbis_mode_blockflag[i]);
#endif
bv.skipBits(16+16+8); // "vorbis_mode_windowtype", "vorbis_mode_transformtype", "vorbis_mode_mapping"
}
return True;
}
static Boolean parseVorbisSetupHeader(OggTrack* track, u_int8_t const* p, unsigned headerSize) {
LEBitVector bv(p, headerSize);
do {
if (!parseVorbisSetup_codebooks(bv)) break;
if (!parseVorbisSetup_timeDomainTransforms(bv)) break;
if (!parseVorbisSetup_floors(bv)) break;
if (!parseVorbisSetup_residues(bv)) break;
if (!parseVorbisSetup_mappings(bv, track->numChannels)) break;
if (!parseVorbisSetup_modes(bv, track)) break;
unsigned framingFlag = bv.getBits(1);
if (framingFlag == 0) {
fprintf(stderr, "Vorbis \"setup\" header did not end with a 'framing flag'!\n");
break;
}
return True;
} while (0);
// An error occurred:
return False;
}
#ifdef DEBUG
#define CHECK_PTR if (p >= pEnd) return False
#define printComment(p, len) do { for (unsigned k = 0; k < len; ++k) { CHECK_PTR; fprintf(stderr, "%c", *p++); } } while (0)
#endif
static Boolean validateCommentHeader(u_int8_t const *p, unsigned headerSize,
unsigned isOpus = 0) {
if (headerSize < 15+isOpus) { // need 7+isOpus + 4(vendor_length) + 4(user_comment_list_length)
fprintf(stderr, "\"comment\" header is too short (%d bytes)\n", headerSize);
return False;
}
#ifdef DEBUG
u_int8_t const* pEnd = &p[headerSize];
p += 7+isOpus;
u_int32_t vendor_length = (p[3]<<24)|(p[2]<<16)|(p[1]<<8)|p[0]; p += 4;
fprintf(stderr, "\tvendor_string:");
printComment(p, vendor_length);
fprintf(stderr, "\n");
u_int32_t user_comment_list_length = (p[3]<<24)|(p[2]<<16)|(p[1]<<8)|p[0]; p += 4;
for (unsigned i = 0; i < user_comment_list_length; ++i) {
CHECK_PTR; u_int32_t length = (p[3]<<24)|(p[2]<<16)|(p[1]<<8)|p[0]; p += 4;
fprintf(stderr, "\tuser_comment[%d]:", i);
printComment(p, length);
fprintf(stderr, "\n");
}
#endif
return True;
}
static unsigned blocksizeFromExponent(unsigned exponent) {
unsigned result = 1;
for (unsigned i = 0; i < exponent; ++i) result = 2*result;
return result;
}
Boolean OggFileParser::validateHeader(OggTrack* track, u_int8_t const* p, unsigned headerSize) {
// Assert: headerSize >= 7 (because we've already checked "<packet_type>XXXXXX" or "OpusXXXX")
if (strcmp(track->mimeType, "audio/VORBIS") == 0) {
u_int8_t const firstByte = p[0];
if (firstByte == 1) { // "identification" header
if (headerSize < 30) {
fprintf(stderr, "Vorbis \"identification\" header is too short (%d bytes)\n", headerSize);
return False;
} else if ((p[29]&0x1) != 1) {
fprintf(stderr, "Vorbis \"identification\" header: 'framing_flag' is not set\n");
return False;
}
p += 7;
u_int32_t vorbis_version = (p[3]<<24)|(p[2]<<16)|(p[1]<<8)|p[0]; p += 4;
if (vorbis_version != 0) {
fprintf(stderr, "Vorbis \"identification\" header has a bad 'vorbis_version': 0x%08x\n", vorbis_version);
return False;
}
u_int8_t audio_channels = *p++;
if (audio_channels == 0) {
fprintf(stderr, "Vorbis \"identification\" header: 'audio_channels' is 0!\n");
return False;
}
track->numChannels = audio_channels;
u_int32_t audio_sample_rate = (p[3]<<24)|(p[2]<<16)|(p[1]<<8)|p[0]; p += 4;
if (audio_sample_rate == 0) {
fprintf(stderr, "Vorbis \"identification\" header: 'audio_sample_rate' is 0!\n");
return False;
}
track->samplingFrequency = audio_sample_rate;
p += 4; // skip over 'bitrate_maximum'
u_int32_t bitrate_nominal = (p[3]<<24)|(p[2]<<16)|(p[1]<<8)|p[0]; p += 4;
if (bitrate_nominal > 0) track->estBitrate = (bitrate_nominal+500)/1000; // round
p += 4; // skip over 'bitrate_maximum'
// Note the two 'block sizes' (samples per packet), and their durations in microseconds:
u_int8_t blocksizeBits = *p++;
unsigned& blocksize_0 = track->vtoHdrs.blocksize[0]; // alias
unsigned& blocksize_1 = track->vtoHdrs.blocksize[1]; // alias
blocksize_0 = blocksizeFromExponent(blocksizeBits&0x0F);
blocksize_1 = blocksizeFromExponent(blocksizeBits>>4);
double uSecsPerSample = 1000000.0/(track->samplingFrequency*2);
// Why the "2"? I don't know, but it seems to be necessary
track->vtoHdrs.uSecsPerPacket[0] = (unsigned)(uSecsPerSample*blocksize_0);
track->vtoHdrs.uSecsPerPacket[1] = (unsigned)(uSecsPerSample*blocksize_1);
#ifdef DEBUG
fprintf(stderr, "\t%u Hz, %u-channel, %u kbps (est), block sizes: %u,%u (%u,%u us)\n",
track->samplingFrequency, track->numChannels, track->estBitrate,
blocksize_0, blocksize_1,
track->vtoHdrs.uSecsPerPacket[0], track->vtoHdrs.uSecsPerPacket[1]);
#endif
// To be valid, "blocksize_0" must be <= "blocksize_1", and both must be in [64,8192]:
if (!(blocksize_0 <= blocksize_1 && blocksize_0 >= 64 && blocksize_1 <= 8192)) {
fprintf(stderr, "Invalid Vorbis \"blocksize_0\" (%d) and/or \"blocksize_1\" (%d)!\n",
blocksize_0, blocksize_1);
return False;
}
} else if (firstByte == 3) { // "comment" header
if (!validateCommentHeader(p, headerSize)) return False;
} else if (firstByte == 5) { // "setup" header
// Parse the "setup" header to get the values that we want:
// "vorbis_mode_count", and "vorbis_mode_blockflag" for each mode. Unfortunately these come
// near the end of the header, so we have to parse lots of other crap first.
p += 7;
if (!parseVorbisSetupHeader(track, p, headerSize)) {
fprintf(stderr, "Failed to parse Vorbis \"setup\" header!\n");
return False;
}
}
} else if (strcmp(track->mimeType, "video/THEORA") == 0) {
u_int8_t const firstByte = p[0];
if (firstByte == 0x80) { // "identification" header
if (headerSize < 42) {
fprintf(stderr, "Theora \"identification\" header is too short (%d bytes)\n", headerSize);
return False;
} else if ((p[41]&0x7) != 0) {
fprintf(stderr, "Theora \"identification\" header: 'res' bits are non-zero\n");
return False;
}
track->vtoHdrs.KFGSHIFT = ((p[40]&3)<<3) | (p[41]>>5);
u_int32_t FRN = (p[22]<<24) | (p[23]<<16) | (p[24]<<8) | p[25]; // Frame rate numerator
u_int32_t FRD = (p[26]<<24) | (p[27]<<16) | (p[28]<<8) | p[29]; // Frame rate numerator
#ifdef DEBUG
fprintf(stderr, "\tKFGSHIFT %d, Frame rate numerator %d, Frame rate denominator %d\n", track->vtoHdrs.KFGSHIFT, FRN, FRD);
#endif
if (FRN == 0 || FRD == 0) {
fprintf(stderr, "Theora \"identification\" header: Bad FRN and/or FRD values: %d, %d\n", FRN, FRD);
return False;
}
track->vtoHdrs.uSecsPerFrame = (unsigned)((1000000.0*FRD)/FRN);
#ifdef DEBUG
fprintf(stderr, "\t\t=> %u microseconds per frame\n", track->vtoHdrs.uSecsPerFrame);
#endif
} else if (firstByte == 0x81) { // "comment" header
if (!validateCommentHeader(p, headerSize)) return False;
} else if (firstByte == 0x82) { // "setup" header
// We don't care about the contents of the Theora "setup" header; just assume it's valid
}
} else { // Opus audio
if (strncmp((char const*)p, "OpusHead", 8) == 0) { // "identification" header
// Just check the size, and the 'major' number of the version byte:
if (headerSize < 19 || (p[8]&0xF0) != 0) return False;
} else { // comment header
if (!validateCommentHeader(p, headerSize, 1/*isOpus*/)) return False;
}
}
return True;
}
void OggFileParser::parseAndDeliverPages() {
#ifdef DEBUG
fprintf(stderr, "parsing and delivering data\n");
#endif
while (parseAndDeliverPage()) {}
}
Boolean OggFileParser::parseAndDeliverPage() {
u_int8_t header_type_flag;
u_int32_t bitstream_serial_number;
parseStartOfPage(header_type_flag, bitstream_serial_number);
OggDemuxedTrack* demuxedTrack = fOurDemux->lookupDemuxedTrack(bitstream_serial_number);
if (demuxedTrack == NULL) { // this track is not being read
#ifdef DEBUG
fprintf(stderr, "\tIgnoring page from unread track; skipping %d remaining packet data bytes\n",
fPacketSizeTable->totSizes);
#endif
skipBytes(fPacketSizeTable->totSizes);
return True;
} else if (fPacketSizeTable->totSizes == 0) {
// This page is empty (has no packets). Skip it and continue
#ifdef DEBUG
fprintf(stderr, "\t[track: %s] Skipping empty page\n", demuxedTrack->MIMEtype());
#endif
return True;
}
// Start delivering packets next:
demuxedTrack->fCurrentPageIsContinuation = (header_type_flag&0x01) != 0;
fCurrentTrackNumber = bitstream_serial_number;
fCurrentParseState = DELIVERING_PACKET_WITHIN_PAGE;
saveParserState();
return False;
}
Boolean OggFileParser::deliverPacketWithinPage() {
OggDemuxedTrack* demuxedTrack = fOurDemux->lookupDemuxedTrack(fCurrentTrackNumber);
if (demuxedTrack == NULL) return False; // should not happen
unsigned packetNum = fPacketSizeTable->nextPacketNumToDeliver;
unsigned packetSize = fPacketSizeTable->size[packetNum];
if (!demuxedTrack->isCurrentlyAwaitingData()) {
// Someone has been reading this stream, but isn't right now.
// We can't deliver this frame until he asks for it, so punt for now.
// The next time he asks for a frame, he'll get it.
#ifdef DEBUG
fprintf(stderr, "\t[track: %s] Deferring delivery of packet %d (%d bytes%s)\n",
demuxedTrack->MIMEtype(), packetNum, packetSize,
packetNum == fPacketSizeTable->numCompletedPackets ? " (incomplete)" : "");
#endif
return True;
}
// Deliver the next packet:
#ifdef DEBUG
fprintf(stderr, "\t[track: %s] Delivering packet %d (%d bytes%s)\n", demuxedTrack->MIMEtype(),
packetNum, packetSize,
packetNum == fPacketSizeTable->numCompletedPackets ? " (incomplete)" : "");
#endif
unsigned numBytesDelivered
= packetSize < demuxedTrack->maxSize() ? packetSize : demuxedTrack->maxSize();
getBytes(demuxedTrack->to(), numBytesDelivered);
u_int8_t firstByte = numBytesDelivered > 0 ? demuxedTrack->to()[0] : 0x00;
u_int8_t secondByte = numBytesDelivered > 1 ? demuxedTrack->to()[1] : 0x00;
demuxedTrack->to() += numBytesDelivered;
if (demuxedTrack->fCurrentPageIsContinuation) { // the previous page's read was incomplete
demuxedTrack->frameSize() += numBytesDelivered;
} else {
// This is the first delivery for this "doGetNextFrame()" call.
demuxedTrack->frameSize() = numBytesDelivered;
}
if (packetSize > demuxedTrack->maxSize()) {
demuxedTrack->numTruncatedBytes() += packetSize - demuxedTrack->maxSize();
}
demuxedTrack->maxSize() -= numBytesDelivered;
// Figure out the duration and presentation time of this frame.
unsigned durationInMicroseconds;
OggTrack* track = fOurFile.lookup(demuxedTrack->fOurTrackNumber);
if (strcmp(track->mimeType, "audio/VORBIS") == 0) {
if ((firstByte&0x01) != 0) { // This is a header packet
durationInMicroseconds = 0;
} else { // This is a data packet.
// Parse the first byte to figure out its duration.
// Extract the next "track->vtoHdrs.ilog_vorbis_mode_count_minus_1" bits of the first byte:
u_int8_t const mask = 0xFE<<(track->vtoHdrs.ilog_vorbis_mode_count_minus_1);
u_int8_t const modeNumber = (firstByte&~mask)>>1;
if (modeNumber >= track->vtoHdrs.vorbis_mode_count) {
fprintf(stderr, "Error: Bad mode number %d (>= vorbis_mode_count %d) in Vorbis packet!\n",
modeNumber, track->vtoHdrs.vorbis_mode_count);
durationInMicroseconds = 0;
} else {
unsigned blockNumber = track->vtoHdrs.vorbis_mode_blockflag[modeNumber];
durationInMicroseconds = track->vtoHdrs.uSecsPerPacket[blockNumber];
}
}
} else if (strcmp(track->mimeType, "video/THEORA") == 0) {
if ((firstByte&0x80) != 0) { // This is a header packet
durationInMicroseconds = 0;
} else { // This is a data packet.
durationInMicroseconds = track->vtoHdrs.uSecsPerFrame;
}
} else { // "audio/OPUS"
if (firstByte == 0x4F/*'O'*/ && secondByte == 0x70/*'p*/) { // This is a header packet
durationInMicroseconds = 0;
} else { // This is a data packet.
// Parse the first byte to figure out the duration of each frame, and then (if necessary)
// parse the second byte to figure out how many frames are in this packet:
u_int8_t config = firstByte >> 3;
u_int8_t c = firstByte & 0x03;
unsigned const configDuration[32] = { // in microseconds
10000, 20000, 40000, 60000, // config 0..3
10000, 20000, 40000, 60000, // config 4..7
10000, 20000, 40000, 60000, // config 8..11
10000, 20000, // config 12..13
10000, 20000, // config 14..15
2500, 5000, 10000, 20000, // config 16..19
2500, 5000, 10000, 20000, // config 20..23
2500, 5000, 10000, 20000, // config 24..27
2500, 5000, 10000, 20000 // config 28..31
};
unsigned const numFramesInPacket = c == 0 ? 1 : c == 3 ? (secondByte&0x3F) : 2;
durationInMicroseconds = numFramesInPacket*configDuration[config];
}
}
if (demuxedTrack->nextPresentationTime().tv_sec == 0 && demuxedTrack->nextPresentationTime().tv_usec == 0) {
// This is the first delivery. Initialize "demuxedTrack->nextPresentationTime()":
gettimeofday(&demuxedTrack->nextPresentationTime(), NULL);
}
demuxedTrack->presentationTime() = demuxedTrack->nextPresentationTime();
demuxedTrack->durationInMicroseconds() = durationInMicroseconds;
demuxedTrack->nextPresentationTime().tv_usec += durationInMicroseconds;
while (demuxedTrack->nextPresentationTime().tv_usec >= 1000000) {
++demuxedTrack->nextPresentationTime().tv_sec;
demuxedTrack->nextPresentationTime().tv_usec -= 1000000;
}
saveParserState();
// And check whether there's a next packet in this page:
if (packetNum == fPacketSizeTable->numCompletedPackets) {
// This delivery was for an incomplete packet, at the end of the page.
// Return without completing delivery:
fCurrentParseState = PARSING_AND_DELIVERING_PAGES;
return False;
}
if (packetNum < fPacketSizeTable->numCompletedPackets-1
|| fPacketSizeTable->lastPacketIsIncomplete) {
// There is at least one more packet (possibly incomplete) left in this packet.
// Deliver it next:
++fPacketSizeTable->nextPacketNumToDeliver;
} else {
// Start parsing a new page next:
fCurrentParseState = PARSING_AND_DELIVERING_PAGES;
}
FramedSource::afterGetting(demuxedTrack); // completes delivery
return True;
}
void OggFileParser::parseStartOfPage(u_int8_t& header_type_flag,
u_int32_t& bitstream_serial_number) {
saveParserState();
// First, make sure we start with the 'capture_pattern': 0x4F676753 ('OggS'):
while (test4Bytes() != 0x4F676753) {
skipBytes(1);
saveParserState(); // ensures forward progress through the file
}
skipBytes(4);
#ifdef DEBUG
fprintf(stderr, "\nSaw Ogg page header:\n");
#endif
u_int8_t stream_structure_version = get1Byte();
if (stream_structure_version != 0) {
fprintf(stderr, "Saw page with unknown Ogg file version number: 0x%02x\n", stream_structure_version);
}
header_type_flag = get1Byte();
#ifdef DEBUG
fprintf(stderr, "\theader_type_flag: 0x%02x (", header_type_flag);
if (header_type_flag&0x01) fprintf(stderr, "continuation ");
if (header_type_flag&0x02) fprintf(stderr, "bos ");
if (header_type_flag&0x04) fprintf(stderr, "eos ");
fprintf(stderr, ")\n");
#endif
u_int32_t granule_position1 = byteSwap(get4Bytes());
u_int32_t granule_position2 = byteSwap(get4Bytes());
bitstream_serial_number = byteSwap(get4Bytes());
u_int32_t page_sequence_number = byteSwap(get4Bytes());
u_int32_t CRC_checksum = byteSwap(get4Bytes());
u_int8_t number_page_segments = get1Byte();
#ifdef DEBUG
fprintf(stderr, "\tgranule_position 0x%08x%08x, bitstream_serial_number 0x%08x, page_sequence_number 0x%08x, CRC_checksum 0x%08x, number_page_segments %d\n", granule_position2, granule_position1, bitstream_serial_number, page_sequence_number, CRC_checksum, number_page_segments);
#else
// Dummy statements to prevent 'unused variable' compiler warnings:
#define DUMMY_STATEMENT(x) do {x = x;} while (0)
DUMMY_STATEMENT(granule_position1);
DUMMY_STATEMENT(granule_position2);
DUMMY_STATEMENT(page_sequence_number);
DUMMY_STATEMENT(CRC_checksum);
#endif
// Look at the "segment_table" to count the sizes of the packets in this page:
delete fPacketSizeTable/*if any*/; fPacketSizeTable = new PacketSizeTable(number_page_segments);
u_int8_t lacing_value = 0;
#ifdef DEBUG
fprintf(stderr, "\tsegment_table\n");
#endif
for (unsigned i = 0; i < number_page_segments; ++i) {
lacing_value = get1Byte();
#ifdef DEBUG
fprintf(stderr, "\t\t%d:\t%d", i, lacing_value);
#endif
fPacketSizeTable->totSizes += lacing_value;
fPacketSizeTable->size[fPacketSizeTable->numCompletedPackets] += lacing_value;
if (lacing_value < 255) {
// This completes a packet:
#ifdef DEBUG
fprintf(stderr, " (->%d)", fPacketSizeTable->size[fPacketSizeTable->numCompletedPackets]);
#endif
++fPacketSizeTable->numCompletedPackets;
}
#ifdef DEBUG
fprintf(stderr, "\n");
#endif
}
fPacketSizeTable->lastPacketIsIncomplete = lacing_value == 255;
}
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