411 lines
10 KiB
C++
411 lines
10 KiB
C++
// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "Sap_Emu.h"
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#include "blargg_endian.h"
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/* Copyright (C) 2006-2008 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "blargg_source.h"
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Sap_Emu::Sap_Emu()
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{
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set_type( gme_sap_type );
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set_silence_lookahead( 6 );
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}
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Sap_Emu::~Sap_Emu() { }
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// Track info
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// Returns 16 or greater if not hex. Handles uppercase and lowercase.
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// Thoroughly tested and rejects ALL non-hex characters.
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inline int from_hex_char( int h )
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{
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h -= 0x30;
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if ( (unsigned) h > 9 )
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h = ((h - 0x11) & 0xDF) + 10;
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return h;
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}
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static int from_hex( byte const in [] )
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{
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int result = 0;
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for ( int n = 4; n--; )
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{
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int h = from_hex_char( *in++ );
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if ( h > 15 )
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return -1;
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result = result * 0x10 + h;
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}
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return result;
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}
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static int parse_int( byte const* io [], byte const* end )
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{
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byte const* in = *io;
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int n = 0;
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while ( in < end )
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{
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int dig = *in - '0';
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if ( (unsigned) dig > 9 )
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break;
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++in;
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n = n * 10 + dig;
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}
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if ( in == *io )
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n = -1; // no numeric characters
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*io = in;
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return n;
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}
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static int from_dec( byte const in [], byte const* end )
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{
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int n = parse_int( &in, end );
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if ( in < end )
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n = -1;
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return n;
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}
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static void parse_string( byte const in [], byte const* end, int len, char out [] )
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{
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byte const* start = in;
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if ( *in++ == '\"' )
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{
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start++;
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while ( in < end && *in != '\"' )
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in++;
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}
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else
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{
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in = end;
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}
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len = min( len - 1, int (in - start) );
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out [len] = 0;
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memcpy( out, start, len );
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}
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static int parse_time( byte const in [], byte const* end )
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{
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int minutes = parse_int( &in, end );
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if ( minutes < 0 || *in != ':' )
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return 0;
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++in;
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int seconds = parse_int( &in, end );
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if ( seconds < 0 )
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return 0;
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int time = minutes * 60000 + seconds * 1000;
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if ( *in == '.' )
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{
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byte const* start = ++in;
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int msec = parse_int( &in, end );
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if ( msec >= 0 )
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{
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// allow 1-3 digits
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for ( int n = in - start; n < 3; n++ )
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msec *= 10;
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time += msec;
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}
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}
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while ( in < end && *in <= ' ' )
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++in;
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if ( end - in >= 4 && !memcmp( in, "LOOP", 4 ) )
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time = -time;
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return time;
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}
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static blargg_err_t parse_info( byte const in [], int size, Sap_Emu::info_t* out )
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{
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out->track_count = 1;
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out->author [0] = 0;
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out->name [0] = 0;
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out->copyright [0] = 0;
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for ( int i = 0; i < Sap_Emu::max_tracks; i++ )
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out->track_times [i] = 0;
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if ( size < 16 || memcmp( in, "SAP\x0D\x0A", 5 ) )
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return blargg_err_file_type;
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int time_count = 0;
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byte const* file_end = in + size - 5;
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in += 5;
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while ( in < file_end && (in [0] != 0xFF || in [1] != 0xFF) )
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{
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byte const* line_end = in;
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while ( line_end < file_end && *line_end != 0x0D )
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line_end++;
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char const* tag = (char const*) in;
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while ( in < line_end && *in > ' ' )
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in++;
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int tag_len = (char const*) in - tag;
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while ( in < line_end && *in <= ' ' ) in++;
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if ( tag_len <= 0 )
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{
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// skip line
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}
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else if ( !strncmp( "TIME", tag, tag_len ) && time_count < Sap_Emu::max_tracks )
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{
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out->track_times [time_count++] = parse_time( in, line_end );
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}
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else if ( !strncmp( "INIT", tag, tag_len ) )
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{
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out->init_addr = from_hex( in );
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if ( (unsigned) out->init_addr >= 0x10000 )
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return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "init address" );
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}
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else if ( !strncmp( "PLAYER", tag, tag_len ) )
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{
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out->play_addr = from_hex( in );
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if ( (unsigned) out->play_addr >= 0x10000 )
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return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "play address" );
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}
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else if ( !strncmp( "MUSIC", tag, tag_len ) )
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{
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out->music_addr = from_hex( in );
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if ( (unsigned) out->music_addr >= 0x10000 )
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return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "music address" );
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}
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else if ( !strncmp( "SONGS", tag, tag_len ) )
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{
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out->track_count = from_dec( in, line_end );
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if ( out->track_count <= 0 )
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return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "track count" );
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}
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else if ( !strncmp( "TYPE", tag, tag_len ) )
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{
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switch ( out->type = *in )
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{
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case 'S':
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out->type = 'C';
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case 'B':
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case 'C':
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case 'D':
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break;
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default:
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return BLARGG_ERR( BLARGG_ERR_FILE_FEATURE, "player type" );
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}
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}
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else if ( !strncmp( "STEREO", tag, tag_len ) )
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{
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out->stereo = true;
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}
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else if ( !strncmp( "FASTPLAY", tag, tag_len ) )
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{
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out->fastplay = from_dec( in, line_end );
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if ( out->fastplay <= 0 )
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return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "fastplay value" );
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}
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else if ( !strncmp( "AUTHOR", tag, tag_len ) )
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{
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parse_string( in, line_end, sizeof out->author, out->author );
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}
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else if ( !strncmp( "NAME", tag, tag_len ) )
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{
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parse_string( in, line_end, sizeof out->name, out->name );
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}
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else if ( !strncmp( "DATE", tag, tag_len ) )
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{
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parse_string( in, line_end, sizeof out->copyright, out->copyright );
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}
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in = line_end + 2;
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}
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if ( in [0] != 0xFF || in [1] != 0xFF )
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return BLARGG_ERR( BLARGG_ERR_FILE_CORRUPT, "ROM data missing" );
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out->rom_data = in + 2;
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return blargg_ok;
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}
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static void copy_sap_fields( Sap_Emu::info_t const& in, track_info_t* out )
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{
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Gme_File::copy_field_( out->game, in.name );
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Gme_File::copy_field_( out->author, in.author );
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Gme_File::copy_field_( out->copyright, in.copyright );
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}
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static void hash_sap_file( Sap_Emu::info_t const& i, byte const* data, int data_size, Music_Emu::Hash_Function& out )
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{
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unsigned char temp[4];
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set_le32( &temp[0], i.init_addr ); out.hash_( &temp[0], sizeof(temp) );
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set_le32( &temp[0], i.play_addr ); out.hash_( &temp[0], sizeof(temp) );
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set_le32( &temp[0], i.music_addr ); out.hash_( &temp[0], sizeof(temp) );
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set_le32( &temp[0], i.type ); out.hash_( &temp[0], sizeof(temp) );
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set_le32( &temp[0], i.fastplay ); out.hash_( &temp[0], sizeof(temp) );
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set_le32( &temp[0], i.stereo ); out.hash_( &temp[0], sizeof(temp) );
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set_le32( &temp[0], i.track_count ); out.hash_( &temp[0], sizeof(temp) );
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out.hash_( data, data_size );
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}
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blargg_err_t Sap_Emu::track_info_( track_info_t* out, int track ) const
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{
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copy_sap_fields( info_, out );
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if ( track < max_tracks )
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{
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int time = info_.track_times [track];
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if ( time )
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{
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if ( time > 0 )
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{
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out->loop_length = 0;
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}
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else
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{
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time = -time;
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out->loop_length = time;
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}
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out->length = time;
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}
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}
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return blargg_ok;
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}
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struct Sap_File : Gme_Info_
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{
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Sap_Emu::info_t info;
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Sap_File() { set_type( gme_sap_type ); }
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blargg_err_t load_mem_( byte const begin [], int size )
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{
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RETURN_ERR( parse_info( begin, size, &info ) );
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set_track_count( info.track_count );
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return blargg_ok;
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}
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blargg_err_t track_info_( track_info_t* out, int ) const
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{
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copy_sap_fields( info, out );
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return blargg_ok;
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}
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blargg_err_t hash_( Hash_Function& out ) const
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{
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hash_sap_file( info, info.rom_data, file_end() - info.rom_data, out );
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return blargg_ok;
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}
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};
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static Music_Emu* new_sap_emu () { return BLARGG_NEW Sap_Emu ; }
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static Music_Emu* new_sap_file() { return BLARGG_NEW Sap_File; }
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gme_type_t_ const gme_sap_type [1] = {{ "Atari XL", 0, &new_sap_emu, &new_sap_file, "SAP", 1 }};
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// Setup
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blargg_err_t Sap_Emu::load_mem_( byte const in [], int size )
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{
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file_end = in + size;
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info_.warning = NULL;
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info_.type = 'B';
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info_.stereo = false;
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info_.init_addr = -1;
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info_.play_addr = -1;
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info_.music_addr = -1;
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info_.fastplay = 312;
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RETURN_ERR( parse_info( in, size, &info_ ) );
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set_warning( info_.warning );
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set_track_count( info_.track_count );
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set_voice_count( Sap_Apu::osc_count << info_.stereo );
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core.apu_impl().volume( gain() );
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static const char* const names [Sap_Apu::osc_count * 2] = {
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"Wave 1", "Wave 2", "Wave 3", "Wave 4",
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"Wave 5", "Wave 6", "Wave 7", "Wave 8",
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};
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set_voice_names( names );
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static int const types [Sap_Apu::osc_count * 2] = {
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wave_type+1, wave_type+2, wave_type+3, wave_type+0,
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wave_type+5, wave_type+6, wave_type+7, wave_type+4,
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};
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set_voice_types( types );
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return setup_buffer( 1773447 );
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}
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void Sap_Emu::update_eq( blip_eq_t const& eq )
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{
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core.apu_impl().synth.treble_eq( eq );
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}
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void Sap_Emu::set_voice( int i, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right )
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{
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int i2 = i - Sap_Apu::osc_count;
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if ( i2 >= 0 )
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core.apu2().set_output( i2, right );
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else
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core.apu().set_output( i, (info_.stereo ? left : center) );
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}
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// Emulation
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void Sap_Emu::set_tempo_( double t )
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{
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core.set_tempo( t );
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}
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blargg_err_t Sap_Emu::start_track_( int track )
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{
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RETURN_ERR( Classic_Emu::start_track_( track ) );
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core.setup_ram();
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// Copy file data to RAM
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byte const* in = info_.rom_data;
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while ( file_end - in >= 5 )
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{
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int start = get_le16( in );
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int end = get_le16( in + 2 );
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//dprintf( "Block $%04X-$%04X\n", start, end );
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in += 4;
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int len = end - start + 1;
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if ( (unsigned) len > (unsigned) (file_end - in) )
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{
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set_warning( "Invalid file data block" );
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break;
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}
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memcpy( core.ram() + start, in, len );
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in += len;
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if ( file_end - in >= 2 && in [0] == 0xFF && in [1] == 0xFF )
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in += 2;
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}
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return core.start_track( track, info_ );
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}
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blargg_err_t Sap_Emu::run_clocks( blip_time_t& duration, int )
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{
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return core.end_frame( duration );
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}
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blargg_err_t Sap_Emu::hash_( Hash_Function& out ) const
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{
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hash_sap_file( info(), info().rom_data, file_end - info().rom_data, out );
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return blargg_ok;
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}
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