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MIDI: Changed Standard MIDI processor to deal with even more bad MIDI files

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This commit is contained in:
Christopher Snowhill 2021-04-08 23:29:39 -07:00
parent 812dde7fb5
commit ee5054e12a
3 changed files with 61 additions and 27 deletions
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2
Frameworks/midi_processing/midi_processing/midi_processor.h
View file

@ -39,7 +39,7 @@ class midi_processor
static bool is_gmf( std::vector<uint8_t> const& p_file );
static bool is_syx( std::vector<uint8_t> const& p_file );
static void process_standard_midi_track( std::vector<uint8_t>::const_iterator & it, std::vector<uint8_t>::const_iterator end, midi_container & p_out, bool needs_end_marker );
static void process_standard_midi_track( std::vector<uint8_t>::const_iterator & it, std::vector<uint8_t>::const_iterator end, midi_container & p_out );
static bool process_standard_midi( std::vector<uint8_t> const& p_file, midi_container & p_out );
static bool process_riff_midi( std::vector<uint8_t> const& p_file, midi_container & p_out );

2
Frameworks/midi_processing/midi_processing/midi_processor_gmf.cpp
View file

@ -48,7 +48,7 @@ bool midi_processor::process_gmf( std::vector<uint8_t> const& p_file, midi_conta
std::vector<uint8_t>::const_iterator it = p_file.begin() + 7;
process_standard_midi_track( it, p_file.end(), p_out, false );
process_standard_midi_track( it, p_file.end(), p_out );
return true;
}

84
Frameworks/midi_processing/midi_processing/midi_processor_standard_midi.cpp
View file

@ -30,10 +30,15 @@ bool midi_processor::process_standard_midi_count( std::vector<uint8_t> const& p_
return true;
}
void midi_processor::process_standard_midi_track( std::vector<uint8_t>::const_iterator & it, std::vector<uint8_t>::const_iterator end, midi_container & p_out, bool needs_end_marker )
void midi_processor::process_standard_midi_track( std::vector<uint8_t>::const_iterator & it, std::vector<uint8_t>::const_iterator end, midi_container & p_out)
{
bool needs_added_end_marker = true;
midi_track track;
midi_event event;
bool event_ready = false;
unsigned current_timestamp = 0;
unsigned next_timestamp;
unsigned char last_event_code = 0xFF;
unsigned last_sysex_length = 0;
@ -44,23 +49,33 @@ void midi_processor::process_standard_midi_track( std::vector<uint8_t>::const_it
for (;;)
{
if ( !needs_end_marker && it == end ) break;
if ( needs_added_end_marker && it == end ) goto trackerror;
int delta = decode_delta( it, end );
if ( !needs_end_marker && it == end ) break;
if ( needs_added_end_marker && it == end ) goto trackerror;
if ( delta < 0 )
{
/*"MIDI processor encountered negative delta: " << delta << "; flipping sign.";*/
delta = -delta;
}
if ( delta > 1000000 )
break;
current_timestamp += delta;
if ( it == end ) break;
next_timestamp = current_timestamp + delta;
if ( it == end ) goto trackerror;
if ( event_ready )
{
track.add_event( event );
event_ready = false;
}
unsigned char event_code = *it++;
unsigned data_bytes_read = 0;
if ( event_code < 0x80 )
{
if ( last_event_code == 0xFF ) break; /*throw exception_io_data("First MIDI track event short encoded");*/
if ( last_event_code == 0xFF ) goto trackerror; /*throw exception_io_data("First MIDI track event short encoded");*/
buffer[ data_bytes_read++ ] = event_code;
event_code = last_event_code;
}
@ -68,15 +83,16 @@ void midi_processor::process_standard_midi_track( std::vector<uint8_t>::const_it
{
if ( last_sysex_length )
{
track.add_event( midi_event( last_sysex_timestamp, midi_event::extended, 0, &buffer[0], last_sysex_length ) );
event = midi_event( last_sysex_timestamp, midi_event::extended, 0, &buffer[0], last_sysex_length );
event_ready = true;
last_sysex_length = 0;
}
last_event_code = event_code;
if ( !needs_end_marker && ( event_code & 0xF0 ) == 0xE0 ) continue;
if ( needs_added_end_marker && ( event_code & 0xF0 ) == 0xE0 ) continue;
if ( data_bytes_read < 1 )
{
if ( it == end ) break;
if ( it == end ) goto trackerror;
buffer[ 0 ] = *it++;
++data_bytes_read;
}
@ -86,36 +102,42 @@ void midi_processor::process_standard_midi_track( std::vector<uint8_t>::const_it
case 0xD0:
break;
default:
if ( it == end ) break;
if ( it == end ) goto trackerror;
buffer[ data_bytes_read ] = *it++;
++data_bytes_read;
}
track.add_event( midi_event( current_timestamp, (midi_event::event_type)(( event_code >> 4 ) - 8), event_code & 0x0F, &buffer[0], data_bytes_read ) );
current_timestamp = next_timestamp;
if ( event_ready )
track.add_event( event );
event = midi_event( current_timestamp, (midi_event::event_type)(( event_code >> 4 ) - 8), event_code & 0x0F, &buffer[0], data_bytes_read );
event_ready = true;
}
else if ( event_code == 0xF0 )
{
if ( last_sysex_length )
{
track.add_event( midi_event( last_sysex_timestamp, midi_event::extended, 0, &buffer[0], last_sysex_length ) );
event = midi_event( last_sysex_timestamp, midi_event::extended, 0, &buffer[0], last_sysex_length );
event_ready = true;
last_sysex_length = 0;
}
int data_count = decode_delta( it, end );
if ( data_count < 0 ) break; /*throw exception_io_data( "Invalid System Exclusive message" );*/
if ( end - it < data_count ) break;
if ( data_count < 0 ) goto trackerror; /*throw exception_io_data( "Invalid System Exclusive message" );*/
if ( end - it < data_count ) goto trackerror;
buffer.resize( data_count + 1 );
buffer[ 0 ] = 0xF0;
std::copy( it, it + data_count, buffer.begin() + 1 );
it += data_count;
last_sysex_length = data_count + 1;
current_timestamp = next_timestamp;
last_sysex_timestamp = current_timestamp;
}
else if ( event_code == 0xF7 ) // SysEx continuation
{
if ( !last_sysex_length ) break;
if ( !last_sysex_length ) goto trackerror;
int data_count = decode_delta( it, end );
if ( data_count < 0 ) break;
if ( end - it < data_count ) break;
if ( data_count < 0 ) goto trackerror;
if ( end - it < data_count ) goto trackerror;
buffer.resize( last_sysex_length + data_count );
std::copy( it, it + data_count, buffer.begin() + last_sysex_length );
it += data_count;
@ -125,25 +147,30 @@ void midi_processor::process_standard_midi_track( std::vector<uint8_t>::const_it
{
if ( last_sysex_length )
{
track.add_event( midi_event( last_sysex_timestamp, midi_event::extended, 0, &buffer[0], last_sysex_length ) );
event = midi_event( last_sysex_timestamp, midi_event::extended, 0, &buffer[0], last_sysex_length );
event_ready = true;
last_sysex_length = 0;
}
if ( it == end ) break;
if ( it == end ) goto trackerror;
unsigned char meta_type = *it++;
int data_count = decode_delta( it, end );
if ( data_count < 0 ) break; /*throw exception_io_data( "Invalid meta message" );*/
if ( end - it < data_count ) break;
if ( end - it < data_count ) goto trackerror;
buffer.resize( data_count + 2 );
buffer[ 0 ] = 0xFF;
buffer[ 1 ] = meta_type;
std::copy( it, it + data_count, buffer.begin() + 2 );
it += data_count;
track.add_event( midi_event( current_timestamp, midi_event::extended, 0, &buffer[0], data_count + 2 ) );
current_timestamp = next_timestamp;
if ( event_ready )
track.add_event( event );
event = midi_event( current_timestamp, midi_event::extended, 0, &buffer[0], data_count + 2 );
event_ready = true;
if ( meta_type == 0x2F )
{
needs_end_marker = true;
needs_added_end_marker = false;
break;
}
}
@ -151,12 +178,19 @@ void midi_processor::process_standard_midi_track( std::vector<uint8_t>::const_it
{
/* Sequencer specific events, single byte */
buffer[ 0 ] = event_code;
track.add_event( midi_event( current_timestamp, midi_event::extended, 0, &buffer[0], 1 ) );
current_timestamp = next_timestamp;
event = midi_event( current_timestamp, midi_event::extended, 0, &buffer[0], 1 );
event_ready = true;
}
else break; /*throw exception_io_data("Unhandled MIDI status code");*/
}
if ( event_ready )
track.add_event( event );
trackerror:
if ( !needs_end_marker )
if ( needs_added_end_marker )
{
buffer[ 0 ] = 0xFF;
buffer[ 1 ] = 0x2F;
@ -208,7 +242,7 @@ bool midi_processor::process_standard_midi( std::vector<uint8_t> const& p_file,
intptr_t track_data_offset = it - p_file.begin();
process_standard_midi_track( it, it + track_size, p_out, true );
process_standard_midi_track( it, it + track_size, p_out );
track_data_offset += track_size;
size_t messup_offset = it - p_file.begin();