diff options
Diffstat (limited to 'plugins/gme/game-music-emu-0.6pre/gme/Dual_Resampler.cpp')
| -rw-r--r-- | plugins/gme/game-music-emu-0.6pre/gme/Dual_Resampler.cpp | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Dual_Resampler.cpp b/plugins/gme/game-music-emu-0.6pre/gme/Dual_Resampler.cpp new file mode 100644 index 00000000..152fbbd3 --- /dev/null +++ b/plugins/gme/game-music-emu-0.6pre/gme/Dual_Resampler.cpp @@ -0,0 +1,200 @@ +// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
+
+#include "Dual_Resampler.h"
+
+/* Copyright (C) 2003-2008 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"
+
+// TODO: fix this. hack since resampler holds back some output.
+int const resampler_extra = 34;
+
+int const stereo = 2;
+
+Dual_Resampler::Dual_Resampler() { }
+
+Dual_Resampler::~Dual_Resampler() { }
+
+blargg_err_t Dual_Resampler::reset( int pairs )
+{
+ // expand allocations a bit
+ RETURN_ERR( sample_buf.resize( (pairs + (pairs >> 2)) * 2 ) );
+ resize( pairs );
+ resampler_size = oversamples_per_frame + (oversamples_per_frame >> 2);
+ RETURN_ERR( resampler.resize_buffer( resampler_size ) );
+ resampler.clear();
+ return blargg_ok;
+}
+
+void Dual_Resampler::resize( int pairs )
+{
+ int new_sample_buf_size = pairs * 2;
+ //new_sample_buf_size = new_sample_buf_size / 4 * 4; // TODO: needed only for 3:2 downsampler
+ if ( sample_buf_size != new_sample_buf_size )
+ {
+ if ( (unsigned) new_sample_buf_size > sample_buf.size() )
+ {
+ check( false );
+ return;
+ }
+ sample_buf_size = new_sample_buf_size;
+ oversamples_per_frame = int (pairs * resampler.rate()) * 2 + 2;
+ clear();
+ }
+}
+
+void Dual_Resampler::clear()
+{
+ buf_pos = sample_buf_size;
+ resampler.clear();
+}
+
+
+void Dual_Resampler::play_frame_( Stereo_Buffer& stereo_buf, dsample_t out [] )
+{
+ int pair_count = sample_buf_size >> 1;
+ blip_time_t blip_time = stereo_buf.center()->count_clocks( pair_count );
+ int sample_count = oversamples_per_frame - resampler.written() + resampler_extra;
+
+ int new_count = set_callback.f( set_callback.data, blip_time, sample_count, resampler.buffer() );
+ assert( new_count < resampler_size );
+
+ stereo_buf.end_frame( blip_time );
+ assert( stereo_buf.samples_avail() == pair_count * 2 );
+
+ resampler.write( new_count );
+
+ int count = resampler.read( sample_buf.begin(), sample_buf_size );
+ assert( count == sample_buf_size );
+
+ mix_samples( stereo_buf, out );
+ stereo_buf.left()->remove_samples( pair_count );
+ stereo_buf.right()->remove_samples( pair_count );
+ stereo_buf.center()->remove_samples( pair_count );
+}
+
+void Dual_Resampler::dual_play( int count, dsample_t out [], Stereo_Buffer& stereo_buf )
+{
+ // empty extra buffer
+ int remain = sample_buf_size - buf_pos;
+ if ( remain )
+ {
+ if ( remain > count )
+ remain = count;
+ count -= remain;
+ memcpy( out, &sample_buf [buf_pos], remain * sizeof *out );
+ out += remain;
+ buf_pos += remain;
+ }
+
+ // entire frames
+ while ( count >= sample_buf_size )
+ {
+ play_frame_( stereo_buf, out );
+ out += sample_buf_size;
+ count -= sample_buf_size;
+ }
+
+ // extra
+ if ( count )
+ {
+ play_frame_( stereo_buf, sample_buf.begin() );
+ buf_pos = count;
+ memcpy( out, sample_buf.begin(), count * sizeof *out );
+ out += count;
+ }
+}
+
+void Dual_Resampler::mix_samples( Stereo_Buffer& stereo_buf, dsample_t out_ [] )
+{
+ // lol hax
+ if ( ((Tracked_Blip_Buffer*)stereo_buf.left())->non_silent() | ((Tracked_Blip_Buffer*)stereo_buf.right())->non_silent() )
+ mix_stereo( stereo_buf, out_ );
+ else
+ mix_mono( stereo_buf, out_ );
+}
+
+void Dual_Resampler::mix_mono( Stereo_Buffer& stereo_buf, dsample_t out_ [] )
+{
+ int const bass = BLIP_READER_BASS( *stereo_buf.center() );
+ BLIP_READER_BEGIN( sn, *stereo_buf.center() );
+
+ int count = sample_buf_size >> 1;
+ BLIP_READER_ADJ_( sn, count );
+
+ typedef dsample_t stereo_dsample_t [2];
+ stereo_dsample_t* BLARGG_RESTRICT out = (stereo_dsample_t*) out_ + count;
+ stereo_dsample_t const* BLARGG_RESTRICT in =
+ (stereo_dsample_t const*) sample_buf.begin() + count;
+ int offset = -count;
+ int const gain = gain_;
+ do
+ {
+ int s = BLIP_READER_READ_RAW( sn ) >> (blip_sample_bits - 16);
+ BLIP_READER_NEXT_IDX_( sn, bass, offset );
+
+ int l = (in [offset] [0] * gain >> gain_bits) + s;
+ int r = (in [offset] [1] * gain >> gain_bits) + s;
+
+ BLIP_CLAMP( l, l );
+ out [offset] [0] = (blip_sample_t) l;
+
+ BLIP_CLAMP( r, r );
+ out [offset] [1] = (blip_sample_t) r;
+ }
+ while ( ++offset );
+
+ BLIP_READER_END( sn, *stereo_buf.center() );
+}
+
+void Dual_Resampler::mix_stereo( Stereo_Buffer& stereo_buf, dsample_t out_ [] )
+{
+ int const bass = BLIP_READER_BASS( *stereo_buf.center() );
+ BLIP_READER_BEGIN( snc, *stereo_buf.center() );
+ BLIP_READER_BEGIN( snl, *stereo_buf.left() );
+ BLIP_READER_BEGIN( snr, *stereo_buf.right() );
+
+ int count = sample_buf_size >> 1;
+ BLIP_READER_ADJ_( snc, count );
+ BLIP_READER_ADJ_( snl, count );
+ BLIP_READER_ADJ_( snr, count );
+
+ typedef dsample_t stereo_dsample_t [2];
+ stereo_dsample_t* BLARGG_RESTRICT out = (stereo_dsample_t*) out_ + count;
+ stereo_dsample_t const* BLARGG_RESTRICT in =
+ (stereo_dsample_t const*) sample_buf.begin() + count;
+ int offset = -count;
+ int const gain = gain_;
+ do
+ {
+ int sc = BLIP_READER_READ_RAW( snc ) >> (blip_sample_bits - 16);
+ int sl = BLIP_READER_READ_RAW( snl ) >> (blip_sample_bits - 16);
+ int sr = BLIP_READER_READ_RAW( snr ) >> (blip_sample_bits - 16);
+ BLIP_READER_NEXT_IDX_( snc, bass, offset );
+ BLIP_READER_NEXT_IDX_( snl, bass, offset );
+ BLIP_READER_NEXT_IDX_( snr, bass, offset );
+
+ int l = (in [offset] [0] * gain >> gain_bits) + sl + sc;
+ int r = (in [offset] [1] * gain >> gain_bits) + sr + sc;
+
+ BLIP_CLAMP( l, l );
+ out [offset] [0] = (blip_sample_t) l;
+
+ BLIP_CLAMP( r, r );
+ out [offset] [1] = (blip_sample_t) r;
+ }
+ while ( ++offset );
+
+ BLIP_READER_END( snc, *stereo_buf.center() );
+ BLIP_READER_END( snl, *stereo_buf.left() );
+ BLIP_READER_END( snr, *stereo_buf.right() );
+}
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