cog/Frameworks/GME/gme/Sap_Emu.cpp

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2013-09-28 03:24:23 +00:00
// Game_Music_Emu $vers. http://www.slack.net/~ant/
#include "Sap_Emu.h"
#include "blargg_endian.h"
/* Copyright (C) 2006-2008 Shay Green. This module 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. This
module 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 module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
Sap_Emu::Sap_Emu()
{
set_type( gme_sap_type );
set_silence_lookahead( 6 );
}
Sap_Emu::~Sap_Emu() { }
// Track info
// Returns 16 or greater if not hex. Handles uppercase and lowercase.
// Thoroughly tested and rejects ALL non-hex characters.
inline int from_hex_char( int h )
{
h -= 0x30;
if ( (unsigned) h > 9 )
h = ((h - 0x11) & 0xDF) + 10;
return h;
}
static int from_hex( byte const in [] )
{
int result = 0;
for ( int n = 4; n--; )
{
int h = from_hex_char( *in++ );
if ( h > 15 )
return -1;
result = result * 0x10 + h;
}
return result;
}
static int parse_int( byte const* io [], byte const* end )
{
byte const* in = *io;
int n = 0;
while ( in < end )
{
int dig = *in - '0';
if ( (unsigned) dig > 9 )
break;
++in;
n = n * 10 + dig;
}
if ( in == *io )
n = -1; // no numeric characters
*io = in;
return n;
}
static int from_dec( byte const in [], byte const* end )
{
int n = parse_int( &in, end );
if ( in < end )
n = -1;
return n;
}
static void parse_string( byte const in [], byte const* end, int len, char out [] )
{
byte const* start = in;
if ( *in++ == '\"' )
{
start++;
while ( in < end && *in != '\"' )
in++;
}
else
{
in = end;
}
len = min( len - 1, int (in - start) );
out [len] = 0;
memcpy( out, start, len );
}
static int parse_time( byte const in [], byte const* end )
{
int minutes = parse_int( &in, end );
if ( minutes < 0 || *in != ':' )
return 0;
++in;
int seconds = parse_int( &in, end );
if ( seconds < 0 )
return 0;
int time = minutes * 60000 + seconds * 1000;
if ( *in == '.' )
{
byte const* start = ++in;
int msec = parse_int( &in, end );
if ( msec >= 0 )
{
// allow 1-3 digits
for ( int n = in - start; n < 3; n++ )
msec *= 10;
time += msec;
}
}
while ( in < end && *in <= ' ' )
++in;
if ( end - in >= 4 && !memcmp( in, "LOOP", 4 ) )
time = -time;
return time;
}
static blargg_err_t parse_info( byte const in [], int size, Sap_Emu::info_t* out )
{
out->track_count = 1;
out->author [0] = 0;
out->name [0] = 0;
out->copyright [0] = 0;
for ( int i = 0; i < Sap_Emu::max_tracks; i++ )
out->track_times [i] = 0;
if ( size < 16 || memcmp( in, "SAP\x0D\x0A", 5 ) )
return blargg_err_file_type;
int time_count = 0;
byte const* file_end = in + size - 5;
in += 5;
while ( in < file_end && (in [0] != 0xFF || in [1] != 0xFF) )
{
byte const* line_end = in;
while ( line_end < file_end && *line_end != 0x0D )
line_end++;
char const* tag = (char const*) in;
while ( in < line_end && *in > ' ' )
in++;
int tag_len = (char const*) in - tag;
while ( in < line_end && *in <= ' ' ) in++;
if ( tag_len <= 0 )
{
// skip line
}
else if ( !strncmp( "TIME", tag, tag_len ) && time_count < Sap_Emu::max_tracks )
{
out->track_times [time_count++] = parse_time( in, line_end );
}
else if ( !strncmp( "INIT", tag, tag_len ) )
{
out->init_addr = from_hex( in );
if ( (unsigned) out->init_addr >= 0x10000 )
return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "init address" );
}
else if ( !strncmp( "PLAYER", tag, tag_len ) )
{
out->play_addr = from_hex( in );
if ( (unsigned) out->play_addr >= 0x10000 )
return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "play address" );
}
else if ( !strncmp( "MUSIC", tag, tag_len ) )
{
out->music_addr = from_hex( in );
if ( (unsigned) out->music_addr >= 0x10000 )
return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "music address" );
}
else if ( !strncmp( "SONGS", tag, tag_len ) )
{
out->track_count = from_dec( in, line_end );
if ( out->track_count <= 0 )
return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "track count" );
}
else if ( !strncmp( "TYPE", tag, tag_len ) )
{
switch ( out->type = *in )
{
case 'S':
out->type = 'C';
case 'B':
case 'C':
case 'D':
break;
default:
return BLARGG_ERR( BLARGG_ERR_FILE_FEATURE, "player type" );
}
}
else if ( !strncmp( "STEREO", tag, tag_len ) )
{
out->stereo = true;
}
else if ( !strncmp( "FASTPLAY", tag, tag_len ) )
{
out->fastplay = from_dec( in, line_end );
if ( out->fastplay <= 0 )
return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "fastplay value" );
}
else if ( !strncmp( "AUTHOR", tag, tag_len ) )
{
parse_string( in, line_end, sizeof out->author, out->author );
}
else if ( !strncmp( "NAME", tag, tag_len ) )
{
parse_string( in, line_end, sizeof out->name, out->name );
}
else if ( !strncmp( "DATE", tag, tag_len ) )
{
parse_string( in, line_end, sizeof out->copyright, out->copyright );
}
in = line_end + 2;
}
if ( in [0] != 0xFF || in [1] != 0xFF )
return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "ROM data missing" );
out->rom_data = in + 2;
return blargg_ok;
}
static void copy_sap_fields( Sap_Emu::info_t const& in, track_info_t* out )
{
Gme_File::copy_field_( out->game, in.name );
Gme_File::copy_field_( out->author, in.author );
Gme_File::copy_field_( out->copyright, in.copyright );
}
static void hash_sap_file( Sap_Emu::info_t const& i, byte const* data, int data_size, Music_Emu::Hash_Function& out )
{
unsigned char temp[4];
set_le32( &temp[0], i.init_addr ); out.hash_( &temp[0], sizeof(temp) );
set_le32( &temp[0], i.play_addr ); out.hash_( &temp[0], sizeof(temp) );
set_le32( &temp[0], i.music_addr ); out.hash_( &temp[0], sizeof(temp) );
set_le32( &temp[0], i.type ); out.hash_( &temp[0], sizeof(temp) );
set_le32( &temp[0], i.fastplay ); out.hash_( &temp[0], sizeof(temp) );
set_le32( &temp[0], i.stereo ); out.hash_( &temp[0], sizeof(temp) );
set_le32( &temp[0], i.track_count ); out.hash_( &temp[0], sizeof(temp) );
out.hash_( data, data_size );
}
blargg_err_t Sap_Emu::track_info_( track_info_t* out, int track ) const
{
copy_sap_fields( info_, out );
if ( track < max_tracks )
{
int time = info_.track_times [track];
if ( time )
{
if ( time > 0 )
{
out->loop_length = 0;
}
else
{
time = -time;
out->loop_length = time;
}
out->length = time;
}
}
return blargg_ok;
}
struct Sap_File : Gme_Info_
{
Sap_Emu::info_t info;
Sap_File() { set_type( gme_sap_type ); }
blargg_err_t load_mem_( byte const begin [], int size )
{
RETURN_ERR( parse_info( begin, size, &info ) );
set_track_count( info.track_count );
return blargg_ok;
}
blargg_err_t track_info_( track_info_t* out, int track ) const
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{
copy_sap_fields( info, out );
if (track < Sap_Emu::max_tracks)
{
int time = info.track_times[track];
if (time)
{
if (time > 0)
{
out->loop_length = 0;
}
else
{
time = -time;
out->loop_length = time;
}
out->length = time;
}
}
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return blargg_ok;
}
blargg_err_t hash_( Hash_Function& out ) const
{
hash_sap_file( info, info.rom_data, file_end() - info.rom_data, out );
return blargg_ok;
}
};
static Music_Emu* new_sap_emu () { return BLARGG_NEW Sap_Emu ; }
static Music_Emu* new_sap_file() { return BLARGG_NEW Sap_File; }
gme_type_t_ const gme_sap_type [1] = {{ "Atari XL", 0, &new_sap_emu, &new_sap_file, "SAP", 1 }};
// Setup
blargg_err_t Sap_Emu::load_mem_( byte const in [], int size )
{
file_end = in + size;
info_.warning = NULL;
info_.type = 'B';
info_.stereo = false;
info_.init_addr = -1;
info_.play_addr = -1;
info_.music_addr = -1;
info_.fastplay = 312;
RETURN_ERR( parse_info( in, size, &info_ ) );
set_warning( info_.warning );
set_track_count( info_.track_count );
set_voice_count( Sap_Apu::osc_count << info_.stereo );
core.apu_impl().volume( gain() );
static const char* const names [Sap_Apu::osc_count * 2] = {
"Wave 1", "Wave 2", "Wave 3", "Wave 4",
"Wave 5", "Wave 6", "Wave 7", "Wave 8",
};
set_voice_names( names );
static int const types [Sap_Apu::osc_count * 2] = {
wave_type+1, wave_type+2, wave_type+3, wave_type+0,
wave_type+5, wave_type+6, wave_type+7, wave_type+4,
};
set_voice_types( types );
return setup_buffer( 1773447 );
}
void Sap_Emu::update_eq( blip_eq_t const& eq )
{
core.apu_impl().synth.treble_eq( eq );
}
void Sap_Emu::set_voice( int i, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right )
{
int i2 = i - Sap_Apu::osc_count;
if ( i2 >= 0 )
core.apu2().set_output( i2, right );
else
core.apu().set_output( i, (info_.stereo ? left : center) );
}
// Emulation
void Sap_Emu::set_tempo_( double t )
{
core.set_tempo( t );
}
blargg_err_t Sap_Emu::start_track_( int track )
{
RETURN_ERR( Classic_Emu::start_track_( track ) );
core.setup_ram();
// Copy file data to RAM
byte const* in = info_.rom_data;
while ( file_end - in >= 5 )
{
int start = get_le16( in );
int end = get_le16( in + 2 );
//dprintf( "Block $%04X-$%04X\n", start, end );
in += 4;
int len = end - start + 1;
if ( (unsigned) len > (unsigned) (file_end - in) )
{
set_warning( "Invalid file data block" );
break;
}
memcpy( core.ram() + start, in, len );
in += len;
if ( file_end - in >= 2 && in [0] == 0xFF && in [1] == 0xFF )
in += 2;
}
return core.start_track( track, info_ );
}
blargg_err_t Sap_Emu::run_clocks( blip_time_t& duration, int )
{
return core.end_frame( duration );
}
blargg_err_t Sap_Emu::hash_( Hash_Function& out ) const
{
hash_sap_file( info(), info().rom_data, file_end - info().rom_data, out );
return blargg_ok;
}