1 files changed, 63 insertions, 256 deletions

diff --git a/apps/codecs/libgme/sgc_emu.c b/apps/codecs/libgme/sgc_emu.c
index 3c3586611c..a2e6b8df29 100644
--- a/apps/codecs/libgme/sgc_emu.c
+++ b/apps/codecs/libgme/sgc_emu.c
@@ -10,34 +10,19 @@ 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,

+License aint 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"

 

 int const osc_count = sms_osc_count + fm_apu_osc_count;

 

-int const stereo = 2; // number of channels for stereo

-int const silence_max = 6; // seconds

-int const silence_threshold = 0x10;

-long const fade_block_size = 512;

-int const fade_shift = 8; // fade ends with gain at 1.0 / (1 << fade_shift)

-

 const char gme_wrong_file_type [] = "Wrong file type for this emulator";

 

 static void clear_track_vars( struct Sgc_Emu* this )

 {

         this->current_track    = -1;

-        this->out_time         = 0;

-        this->emu_time         = 0;

-        this->emu_track_ended_ = true;

-        this->track_ended      = true;

-        this->fade_start       = INT_MAX / 2 + 1;

-        this->fade_step        = 1;

-        this->silence_time     = 0;

-        this->silence_count    = 0;

-        this->buf_remain       = 0;

-        /* warning(); // clear warning */

+        track_stop( &this->track_filter );

 }

 

 void Sgc_init( struct Sgc_Emu* this )

@@ -48,12 +33,12 @@ void Sgc_init( struct Sgc_Emu* this )
         this->mute_mask_  = 0;

         this->tempo       = (int)FP_ONE_TEMPO;

         this->gain        = (int)FP_ONE_GAIN;

-        this->voice_count = 0;

         

         // defaults

-        this->max_initial_silence = 2;

-        this->silence_lookahead   = 6;

-        this->ignore_silence      = false;

+        this->tfilter = *track_get_setup( &this->track_filter );

+        this->tfilter.max_initial = 2;

+        this->tfilter.lookahead   = 6;

+        this->track_filter.silence_ignored_ = false;

 

         Sms_apu_init( &this->apu );

         Fm_apu_create( &this->fm_apu );

@@ -62,8 +47,10 @@ void Sgc_init( struct Sgc_Emu* this )
         Z80_init( &this->cpu );

 

         Sound_set_gain( this, (int)(FP_ONE_GAIN*1.2) );

-                

+        

         // Unload

+        this->voice_count = 0;

+        this->voice_types = 0;

         clear_track_vars( this );

 }

 

@@ -95,6 +82,10 @@ blargg_err_t Sgc_load_mem( struct Sgc_Emu* this, const void* data, long size )
         this->m3u.size = 0;

         this->track_count = this->header.song_count;

         this->voice_count =  sega_mapping( this ) ? osc_count : sms_osc_count;

+        static int const types [osc_count + 1] = {

+                wave_type+1, wave_type+2, wave_type+3, mixed_type+1, mixed_type+2

+        };

+        this->voice_types = types;

         

         Sms_apu_volume( &this->apu, this->gain );

         Fm_apu_volume( &this->fm_apu, this->gain );

@@ -102,10 +93,10 @@ blargg_err_t Sgc_load_mem( struct Sgc_Emu* this, const void* data, long size )
         // Setup buffer

         this->clock_rate_ = clock_rate( this );

         Buffer_clock_rate( &this->stereo_buf, clock_rate( this ) );

+        RETURN_ERR( Buffer_set_channel_count( &this->stereo_buf, this->voice_count, this->voice_types ) );

         this->buf_changed_count = Buffer_channels_changed_count( &this->stereo_buf );

-        Sound_set_tempo( this, this->tempo );

 

-        // Remute voices

+        Sound_set_tempo( this, this->tempo );

         Sound_mute_voices( this, this->mute_mask_ );

         return 0;

 }

@@ -249,7 +240,7 @@ void cpu_write( struct Sgc_Emu* this, addr_t addr, int data )
         }

 }

 

-blargg_err_t Sgc_set_sample_rate( struct Sgc_Emu* this, long rate )

+blargg_err_t Sgc_set_sample_rate( struct Sgc_Emu* this, int rate )

 {

         require( !this->sample_rate ); // sample rate can't be changed once set

         Buffer_init( &this->stereo_buf );

@@ -259,6 +250,8 @@ blargg_err_t Sgc_set_sample_rate( struct Sgc_Emu* this, long rate )
         Buffer_bass_freq( &this->stereo_buf, 80 );

 

         this->sample_rate = rate;

+        RETURN_ERR( track_init( &this->track_filter, this ) );

+        this->tfilter.max_silence = 6 * stereo * this->sample_rate;

         return 0;

 }

 

@@ -286,7 +279,7 @@ void Sound_mute_voices( struct Sgc_Emu* this, int mask )
                 }

                 else

                 {

-                        struct channel_t ch = Buffer_channel( &this->stereo_buf );

+                        struct channel_t ch = Buffer_channel( &this->stereo_buf, i );

                         assert( (ch.center && ch.left && ch.right) ||

                                         (!ch.center && !ch.left && !ch.right) ); // all or nothing

                         Sound_set_voice( this, i, ch.center, ch.left, ch.right );

@@ -306,7 +299,6 @@ void Sound_set_tempo( struct Sgc_Emu* this, int t )
         this->play_period = (int) ((clock_rate( this ) * FP_ONE_TEMPO) / (this->header.rate ? 50 : 60) / t);

 }

 

-void fill_buf( struct Sgc_Emu* this );

 blargg_err_t Sgc_start_track( struct Sgc_Emu* this, int track )

 {

         clear_track_vars( this );

@@ -383,275 +375,90 @@ blargg_err_t Sgc_start_track( struct Sgc_Emu* this, int track )
 

         Buffer_clear( &this->stereo_buf );

 

-        this->emu_track_ended_ = false;

-        this->track_ended     = false;

-

-        if ( !this->ignore_silence )

-        {

-                // play until non-silence or end of track

-                long end;

-                for ( end = this->max_initial_silence * stereo * this->sample_rate; this->emu_time < end; )

-                {

-                        fill_buf( this );

-                        if ( this->buf_remain | (int) this->emu_track_ended_ )

-                                break;

-                }

-                

-                this->emu_time      = this->buf_remain;

-                this->out_time      = 0;

-                this->silence_time  = 0;

-                this->silence_count = 0;

-        }

-        /* return track_ended() ? warning() : 0; */

-        return 0;

+        // convert filter times to samples

+        struct setup_t s = this->tfilter;

+        s.max_initial *= this->sample_rate * stereo;

+        #ifdef GME_DISABLE_SILENCE_LOOKAHEAD

+                s.lookahead = 1;

+        #endif

+        track_setup( &this->track_filter, &s );

+        

+        return track_start( &this->track_filter );

 }

 

 // Tell/Seek

 

-static blargg_long msec_to_samples( blargg_long msec, long sample_rate )

+static int msec_to_samples( int msec, int sample_rate )

 {

-        blargg_long sec = msec / 1000;

+        int sec = msec / 1000;

         msec -= sec * 1000;

         return (sec * sample_rate + msec * sample_rate / 1000) * stereo;

 }

 

-long Track_tell( struct Sgc_Emu* this )

+int Track_tell( struct Sgc_Emu* this )

 {

-        blargg_long rate = this->sample_rate * stereo;

-        blargg_long sec = this->out_time / rate;

-        return sec * 1000 + (this->out_time - sec * rate) * 1000 / rate;

+        int rate = this->sample_rate * stereo;

+        int sec = track_sample_count( &this->track_filter ) / rate;

+        return sec * 1000 + (track_sample_count( &this->track_filter ) - sec * rate) * 1000 / rate;

 }

 

-blargg_err_t Track_seek( struct Sgc_Emu* this, long msec )

+blargg_err_t Track_seek( struct Sgc_Emu* this, int msec )

 {

-        blargg_long time = msec_to_samples( msec, this->sample_rate );

-        if ( time < this->out_time )

-                RETURN_ERR( Sgc_start_track( this, this->current_track ) );

-        return Track_skip( this, time - this->out_time );

+        int time = msec_to_samples( msec, this->sample_rate );

+        if ( time < track_sample_count( &this->track_filter ) )

+        RETURN_ERR( Sgc_start_track( this, this->current_track ) );

+        return Track_skip( this, time - track_sample_count( &this->track_filter ) );

 }

 

-blargg_err_t skip_( struct Sgc_Emu* this, long count );

-blargg_err_t Track_skip( struct Sgc_Emu* this, long count )

+blargg_err_t Track_skip( struct Sgc_Emu* this, int count )

 {

         require( this->current_track >= 0 ); // start_track() must have been called already

-        this->out_time += count;

-        

-        // remove from silence and buf first

-        {

-                long n = min( count, this->silence_count );

-                this->silence_count -= n;

-                count -= n;

-                

-                n = min( count, this->buf_remain );

-                this->buf_remain -= n;

-                count -= n;

-        }

-                

-        if ( count && !this->emu_track_ended_ )

-        {

-                this->emu_time += count;

-                

-                // End track if error

-                if ( skip_( this, count ) ) {

-                        this->emu_track_ended_ = true;

-                }

-        }

-        

-        if ( !(this->silence_count | this->buf_remain) ) // caught up to emulator, so update track ended

-                this->track_ended |= this->emu_track_ended_;

-        

-        return 0;

+        return track_skip( &this->track_filter, count );

 }

 

-blargg_err_t play_( struct Sgc_Emu* this, long count, sample_t* out );

-blargg_err_t skip_( struct Sgc_Emu* this, long count )

+blargg_err_t skip_( void* emu, int count )

 {

+        struct Sgc_Emu* this = (struct Sgc_Emu*) emu;

+        

         // for long skip, mute sound

-        const long threshold = 30000;

+        const int threshold = 32768;

         if ( count > threshold )

         {

                 int saved_mute = this->mute_mask_;

                 Sound_mute_voices( this, ~0 );

-                

-                while ( count > threshold / 2 && !this->emu_track_ended_ )

-                {

-                        RETURN_ERR( play_( this, buf_size, this->buf ) );

-                        count -= buf_size;

-                }

-                

-                Sound_mute_voices( this, saved_mute );

-        }

-        

-        while ( count && !this->emu_track_ended_ )

-        {

-                long n = buf_size;

-                if ( n > count )

-                        n = count;

-                count -= n;

-                RETURN_ERR( play_( this, n, this->buf ) );

-        }

-        return 0;

-}

-

-// Fading

-

-void Track_set_fade( struct Sgc_Emu* this, long start_msec, long length_msec )

-{

-        this->fade_step = this->sample_rate * length_msec / (fade_block_size * fade_shift * 1000 / stereo);

-        this->fade_start = msec_to_samples( start_msec, this->sample_rate );

-}

-

-// unit / pow( 2.0, (double) x / step )

-static int int_log( blargg_long x, int step, int unit )

-{

-        int shift = x / step;

-        int fraction = (x - shift * step) * unit / step;

-        return ((unit - fraction) + (fraction >> 1)) >> shift;

-}

-

-static void handle_fade( struct Sgc_Emu* this, long out_count, sample_t* out )

-{

-        int i;

-        for ( i = 0; i < out_count; i += fade_block_size )

-        {

-                int const shift = 14;

-                int const unit = 1 << shift;

-                int gain = int_log( (this->out_time + i - this->fade_start) / fade_block_size,

-                                this->fade_step, unit );

-                if ( gain < (unit >> fade_shift) )

-                        this->track_ended = this->emu_track_ended_ = true;

-                

-                sample_t* io = &out [i];

-                int count;

-                for ( count = min( fade_block_size, out_count - i ); count; --count )

-                {

-                        *io = (sample_t) ((*io * gain) >> shift);

-                        ++io;

-                }

-        }

-}

 

-// Silence detection

+                int n = count - threshold/2;

+                n &= ~(2048-1); // round to multiple of 2048

+                count -= n;

+                RETURN_ERR( skippy_( &this->track_filter, n ) );

 

-static void emu_play( struct Sgc_Emu* this, long count, sample_t* out )

-{

-        check( this->current_track_ >= 0 );

-        this->emu_time += count;

-        if ( this->current_track >= 0 && !this->emu_track_ended_ ) {

-                // End track if error

-                if ( play_( this, count, out ) )

-                        this->emu_track_ended_ = true;

+                Sound_mute_voices( this, saved_mute );

         }

-        else

-                memset( out, 0, count * sizeof *out );

-}

 

-// number of consecutive silent samples at end

-static long count_silence( sample_t* begin, long size )

-{

-        sample_t first = *begin;

-        *begin = silence_threshold; // sentinel

-        sample_t* p = begin + size;

-        while ( (unsigned) (*--p + silence_threshold / 2) <= (unsigned) silence_threshold ) { }

-        *begin = first;

-        return size - (p - begin);

+        return skippy_( &this->track_filter, count );

 }

 

-// fill internal buffer and check it for silence

-void fill_buf( struct Sgc_Emu* this )

+void Track_set_fade( struct Sgc_Emu* this, int start_msec, int length_msec )

 {

-        assert( !this->buf_remain );

-        if ( !this->emu_track_ended_ )

-        {

-                emu_play( this, buf_size, this->buf );

-                long silence = count_silence( this->buf, buf_size );

-                if ( silence < buf_size )

-                {

-                        this->silence_time = this->emu_time - silence;

-                        this->buf_remain   = buf_size;

-                        return;

-                }

-        }

-        this->silence_count += buf_size;

+        track_set_fade( &this->track_filter, msec_to_samples( start_msec, this->sample_rate ),

+                length_msec * this->sample_rate / (1000 / stereo) );

 }

 

-blargg_err_t Sgc_play( struct Sgc_Emu* this, long out_count, sample_t* out )

+blargg_err_t Sgc_play( struct Sgc_Emu* this, int out_count, sample_t* out )

 {

-        if ( this->track_ended )

-        {

-                memset( out, 0, out_count * sizeof *out );

-        }

-        else

-        {

-                require( this->current_track >= 0 );

-                require( out_count % stereo == 0 );

-                

-                assert( this->emu_time >= this->out_time );

-                

-                // prints nifty graph of how far ahead we are when searching for silence

-                //debug_printf( "%*s \n", int ((emu_time - out_time) * 7 / sample_rate()), "*" );

-                

-                long pos = 0;

-                if ( this->silence_count )

-                {

-                        // during a run of silence, run emulator at >=2x speed so it gets ahead

-                        long ahead_time = this->silence_lookahead * (this->out_time + out_count - this->silence_time) + this->silence_time;

-                        while ( this->emu_time < ahead_time && !(this->buf_remain | this->emu_track_ended_) )

-                                fill_buf( this );

-                        

-                        // fill with silence

-                        pos = min( this->silence_count, out_count );

-                        memset( out, 0, pos * sizeof *out );

-                        this->silence_count -= pos;

-                        

-                        if ( this->emu_time - this->silence_time > silence_max * stereo * this->sample_rate )

-                        {

-                                this->track_ended  = this->emu_track_ended_ = true;

-                                this->silence_count = 0;

-                                this->buf_remain    = 0;

-                        }

-                }

-                

-                if ( this->buf_remain )

-                {

-                        // empty silence buf

-                        long n = min( this->buf_remain, out_count - pos );

-                        memcpy( &out [pos], this->buf + (buf_size - this->buf_remain), n * sizeof *out );

-                        this->buf_remain -= n;

-                        pos += n;

-                }

-                

-                // generate remaining samples normally

-                long remain = out_count - pos;

-                if ( remain )

-                {

-                        emu_play( this, remain, out + pos );

-                        this->track_ended |= this->emu_track_ended_;

-                        

-                        if ( !this->ignore_silence || this->out_time > this->fade_start )

-                        {

-                                // check end for a new run of silence

-                                long silence = count_silence( out + pos, remain );

-                                if ( silence < remain )

-                                        this->silence_time = this->emu_time - silence;

-                                

-                                if ( this->emu_time - this->silence_time >= buf_size )

-                                        fill_buf( this ); // cause silence detection on next play()

-                        }

-                }

-                

-                if ( this->out_time > this->fade_start )

-                        handle_fade( this, out_count, out );

-        }

-        this->out_time += out_count;

-        return 0;

+        require( this->current_track >= 0 );

+        require( out_count % stereo == 0 );

+        return track_play( &this->track_filter, out_count, out );

 }

 

-blargg_err_t play_( struct Sgc_Emu* this, long count, sample_t* out )

+blargg_err_t play_( void* emu, int count, sample_t out [] )

 {

-        long remain = count;

+        struct Sgc_Emu* this = (struct Sgc_Emu*) emu;

+        

+        int remain = count;

         while ( remain )

         {

+                Buffer_disable_immediate_removal( &this->stereo_buf );

                 remain -= Buffer_read_samples( &this->stereo_buf, &out [count - remain], remain );

                 if ( remain )

                 {