1 files changed, 393 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Spc_Emu.cpp b/plugins/gme/game-music-emu-0.6pre/gme/Spc_Emu.cpp
new file mode 100644
index 00000000..51cb10bc
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6pre/gme/Spc_Emu.cpp
@@ -0,0 +1,393 @@
+// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
+
+#include "Spc_Emu.h"
+
+#include "blargg_endian.h"
+
+/* Copyright (C) 2004-2009 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"
+
+// TODO: support Spc_Filter's bass
+
+Spc_Emu::Spc_Emu()
+{
+	set_type( gme_spc_type );
+	set_gain( 1.4 );
+}
+
+Spc_Emu::~Spc_Emu() { }
+
+// Track info
+
+int const trailer_offset = 0x10200;
+
+inline byte const* Spc_Emu::trailer_() const { return &file_begin() [min( file_size(), trailer_offset )]; }
+
+inline int Spc_Emu::trailer_size_() const { return max( 0, file_size() - trailer_offset ); }
+
+static void get_spc_xid6( byte const begin [], int size, track_info_t* out )
+{
+	// header
+	byte const* end = begin + size;
+	if ( size < 8 || memcmp( begin, "xid6", 4 ) )
+	{
+		check( false );
+		return;
+	}
+	int info_size = get_le32( begin + 4 );
+	byte const* in = begin + 8; 
+	if ( end - in > info_size )
+	{
+		dprintf( "SPC: Extra data after xid6\n" );
+		end = in + info_size;
+	}
+	
+	int year = 0;
+	char copyright [256 + 5];
+	int copyright_len = 0;
+	int const year_len = 5;
+	int disc = 0, track = 0;
+	
+	while ( end - in >= 4 )
+	{
+		// header
+		int id   = in [0];
+		int data = in [3] * 0x100 + in [2];
+		int type = in [1];
+		int len  = type ? data : 0;
+		in += 4;
+		if ( len > end - in )
+		{
+			dprintf( "SPC: xid6 goes past end" );
+			break; // block goes past end of data
+		}
+		
+		// handle specific block types
+		char* field = NULL;
+		switch ( id )
+		{
+			case 0x01: field = out->song;    break;
+			case 0x02: field = out->game;    break;
+			case 0x03: field = out->author;  break;
+			case 0x04: field = out->dumper;  break;
+			case 0x07: field = out->comment; break;
+			case 0x10: field = out->ost;     break;
+			case 0x11: disc = data;          break;
+			case 0x12: track = data;         break;
+			case 0x14: year = data;          break;
+			
+			//case 0x30: // intro length
+			// Many SPCs have intro length set wrong for looped tracks, making it useless
+			/*
+			case 0x30:
+				check( len == 4 );
+				if ( len >= 4 )
+				{
+					out->intro_length = get_le32( in ) / 64;
+					if ( out->length > 0 )
+					{
+						int loop = out->length - out->intro_length;
+						if ( loop >= 2000 )
+							out->loop_length = loop;
+					}
+				}
+				break;
+			*/
+			
+			case 0x33:
+				check( len == 4 );
+				if ( len >= 4 )
+				{
+					out->fade_length = get_le32( in ) / 64;
+				}
+				break;
+			
+			case 0x13:
+				copyright_len = min( len, (int) sizeof copyright - year_len );
+				memcpy( &copyright [year_len], in, copyright_len );
+				break;
+			
+			default:
+				if ( id < 0x01 || (id > 0x07 && id < 0x10) ||
+						(id > 0x14 && id < 0x30) || id > 0x36 )
+					dprintf( "SPC: Unknown xid6 block: %X\n", (int) id );
+				break;
+		}
+		if ( field )
+		{
+			check( type == 1 );
+			Gme_File::copy_field_( field, (char const*) in, len );
+		}
+		
+		// skip to next block
+		in += len;
+		
+		// blocks are supposed to be 4-byte aligned with zero-padding...
+		byte const* unaligned = in;
+		while ( (in - begin) & 3 && in < end )
+		{
+			if ( *in++ != 0 )
+			{
+				// ...but some files have no padding
+				in = unaligned;
+				//dprintf( "SPC: xid6 info tag wasn't properly padded to align\n" );
+				break;
+			}
+		}
+	}
+	
+	char* p = &copyright [year_len];
+	if ( year )
+	{
+		*--p = ' ';
+		// avoid using bloated printf
+		for ( int n = 4; n--; )
+		{
+			*--p = char (year % 10 + '0');
+			year /= 10;
+		}
+		copyright_len += year_len;
+	}
+	if ( copyright_len )
+		Gme_File::copy_field_( out->copyright, p, copyright_len );
+	
+	if ( disc > 0 && disc <= 9 )
+	{
+		out->disc [0] = disc + '0';
+		out->disc [1] = 0;
+	}
+
+	if ( track > 255 && track < ( ( 100 << 8 ) - 1 ) )
+	{
+		char* p = &copyright [3];
+		*p = 0;
+		if ( track & 255 ) *--p = char (track & 255);
+		track >>= 8;
+		for ( int n = 2; n-- && track; )
+		{
+			*--p = char (track % 10 + '0');
+			track /= 10;
+		}
+		memcpy( out->track, p, &copyright [4] - p );
+	}
+
+	check( in == end );
+}
+
+static void get_spc_info( Spc_Emu::header_t const& h, byte const xid6 [], int xid6_size,
+		track_info_t* out )
+{
+	// decode length (can be in text or binary format, sometimes ambiguous ugh)
+	int len_secs = 0;
+	int i;
+	for ( i = 0; i < 3; i++ )
+	{
+		unsigned n = h.len_secs [i] - '0';
+		if ( n > 9 )
+		{
+			// ignore single-digit text lengths
+			// (except if author field is present and begins at offset 1, ugh)
+			if ( i == 1 && (h.author [0] || !h.author [1]) )
+				len_secs = 0;
+			break;
+		}
+		len_secs *= 10;
+		len_secs += n;
+	}
+	if ( !len_secs || len_secs > 0x1FFF )
+		len_secs = get_le16( h.len_secs );
+	if ( len_secs < 0x1FFF )
+		out->length = len_secs * 1000;
+	
+	long fade_msec = 0;
+	for ( i = 0; i < 4; i++ )
+	{
+		unsigned n = h.fade_msec [i] - '0';
+		if ( n > 9 )
+		{
+			if ( i == 1 && (h.author [0] || !h.author [1]) )
+				fade_msec = -1;
+			break;
+		}
+		fade_msec *= 10;
+		fade_msec += n;
+	}
+	if ( i == 4 && unsigned( h.author [0] - '0' ) <= 9 )
+		fade_msec = fade_msec * 10 + h.author [0] - '0';
+	if ( fade_msec < 0 || fade_msec > 0x7FFF )
+		fade_msec = get_le32( h.fade_msec );
+	if ( fade_msec < 0x7FFF )
+		out->fade_length = fade_msec;
+
+	int offset = (h.author [0] < ' ' || unsigned (h.author [0] - '0') <= 9);
+	Gme_File::copy_field_( out->author, &h.author [offset], sizeof h.author - offset );
+	
+	GME_COPY_FIELD( h, out, song );
+	GME_COPY_FIELD( h, out, game );
+	GME_COPY_FIELD( h, out, dumper );
+	GME_COPY_FIELD( h, out, comment );
+	
+	if ( xid6_size )
+		get_spc_xid6( xid6, xid6_size, out );
+}
+
+blargg_err_t Spc_Emu::track_info_( track_info_t* out, int ) const
+{
+	get_spc_info( header(), trailer_(), trailer_size_(), out );
+	return blargg_ok;
+}
+
+static blargg_err_t check_spc_header( void const* header )
+{
+	if ( memcmp( header, "SNES-SPC700 Sound File Data", 27 ) )
+		return blargg_err_file_type;
+	return blargg_ok;
+}
+
+struct Spc_File : Gme_Info_
+{
+	Spc_Emu::header_t header;
+	blargg_vector<byte> xid6;
+	
+	Spc_File() { set_type( gme_spc_type ); }
+	
+	blargg_err_t load_( Data_Reader& in )
+	{
+		int file_size = in.remain();
+		if ( file_size < Snes_Spc::spc_min_file_size )
+			return blargg_err_file_type;
+		RETURN_ERR( in.read( &header, header.size ) );
+		RETURN_ERR( check_spc_header( header.tag ) );
+		int const xid6_offset = 0x10200;
+		int xid6_size = file_size - xid6_offset;
+		if ( xid6_size > 0 )
+		{
+			RETURN_ERR( xid6.resize( xid6_size ) );
+			RETURN_ERR( in.skip( xid6_offset - header.size ) );
+			RETURN_ERR( in.read( xid6.begin(), xid6.size() ) );
+		}
+		return blargg_ok;
+	}
+	
+	blargg_err_t track_info_( track_info_t* out, int ) const
+	{
+		get_spc_info( header, xid6.begin(), xid6.size(), out );
+		return blargg_ok;
+	}
+};
+
+static Music_Emu* new_spc_emu () { return BLARGG_NEW Spc_Emu ; }
+static Music_Emu* new_spc_file() { return BLARGG_NEW Spc_File; }
+
+gme_type_t_ const gme_spc_type [1] = {{ "Super Nintendo", 1, &new_spc_emu, &new_spc_file, "SPC", 0 }};
+
+// Setup
+
+blargg_err_t Spc_Emu::set_sample_rate_( int sample_rate )
+{
+	RETURN_ERR( apu.init() );
+	if ( sample_rate != native_sample_rate )
+	{
+		RETURN_ERR( resampler.resize_buffer( native_sample_rate / 20 * 2 ) );
+		RETURN_ERR( resampler.set_rate( (double) native_sample_rate / sample_rate ) ); // 0.9965 rolloff
+	}
+	return blargg_ok;
+}
+
+void Spc_Emu::mute_voices_( int m )
+{
+	Music_Emu::mute_voices_( m );
+	apu.mute_voices( m );
+}
+
+blargg_err_t Spc_Emu::load_mem_( byte const in [], int size )
+{
+	assert( offsetof (header_t,unused2 [46]) == header_t::size );
+	set_voice_count( Spc_Dsp::voice_count );
+	if ( size < Snes_Spc::spc_min_file_size )
+		return blargg_err_file_type;
+	
+	static const char* const names [Spc_Dsp::voice_count] = {
+		"DSP 1", "DSP 2", "DSP 3", "DSP 4", "DSP 5", "DSP 6", "DSP 7", "DSP 8"
+	};
+	set_voice_names( names );
+	
+	return check_spc_header( in );
+}
+
+// Emulation
+
+void Spc_Emu::set_tempo_( double t )
+{
+	apu.set_tempo( (int) (t * Snes_Spc::tempo_unit) );
+}
+
+blargg_err_t Spc_Emu::start_track_( int track )
+{
+	RETURN_ERR( Music_Emu::start_track_( track ) );
+	resampler.clear();
+	filter.clear();
+	RETURN_ERR( apu.load_spc( file_begin(), file_size() ) );
+	filter.set_gain( (int) (gain() * SPC_Filter::gain_unit) );
+	apu.clear_echo();
+	return blargg_ok;
+}
+
+blargg_err_t Spc_Emu::play_and_filter( int count, sample_t out [] )
+{
+	RETURN_ERR( apu.play( count, out ) );
+	filter.run( out, count );
+	return blargg_ok;
+}
+
+blargg_err_t Spc_Emu::skip_( int count )
+{
+	if ( sample_rate() != native_sample_rate )
+	{
+		count = (int) (count * resampler.rate()) & ~1;
+		count -= resampler.skip_input( count );
+	}
+	
+	// TODO: shouldn't skip be adjusted for the 64 samples read afterwards?
+	
+	if ( count > 0 )
+	{
+		RETURN_ERR( apu.skip( count ) );
+		filter.clear();
+	}
+	
+	// eliminate pop due to resampler
+	const int resampler_latency = 64;
+	sample_t buf [resampler_latency];
+	return play_( resampler_latency, buf );
+}
+
+blargg_err_t Spc_Emu::play_( int count, sample_t out [] )
+{
+	if ( sample_rate() == native_sample_rate )
+		return play_and_filter( count, out );
+	
+	int remain = count;
+	while ( remain > 0 )
+	{
+		remain -= resampler.read( &out [count - remain], remain );
+		if ( remain > 0 )
+		{
+			int n = resampler.buffer_free();
+			RETURN_ERR( play_and_filter( n, resampler.buffer() ) );
+			resampler.write( n );
+		}
+	}
+	check( remain == 0 );
+	return blargg_ok;
+}