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authorSean Bartell <wingedtachikoma@gmail.com>2011-06-25 21:32:25 -0400
committerNils Wallménius <nils@rockbox.org>2012-04-25 22:13:20 +0200
commitf40bfc9267b13b54e6379dfe7539447662879d24 (patch)
tree9b20069d5e62809ff434061ad730096836f916f2 /apps/codecs/libgme/blip_buffer.c
parenta0009907de7a0107d49040d8a180f140e2eff299 (diff)
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Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'apps/codecs/libgme/blip_buffer.c')
-rw-r--r--apps/codecs/libgme/blip_buffer.c225
1 files changed, 0 insertions, 225 deletions
diff --git a/apps/codecs/libgme/blip_buffer.c b/apps/codecs/libgme/blip_buffer.c
deleted file mode 100644
index ba0a655..0000000
--- a/apps/codecs/libgme/blip_buffer.c
+++ /dev/null
@@ -1,225 +0,0 @@
-// Blip_Buffer 0.4.1. http://www.slack.net/~ant/
-
-#include "blip_buffer.h"
-
-#include <limits.h>
-#include <string.h>
-#include <stdlib.h>
-#include <math.h>
-
-/* Copyright (C) 2003-2006 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"
-
-void Blip_init( struct Blip_Buffer* this )
-{
- this->factor_ = UINT_MAX/2 + 1;;
- this->buffer_center_ = NULL;
- this->buffer_size_ = 0;
- this->sample_rate_ = 0;
- this->bass_shift_ = 0;
- this->clock_rate_ = 0;
- this->bass_freq_ = 16;
- this->length_ = 0;
-
- // assumptions code makes about implementation-defined features
- #ifndef NDEBUG
- // right shift of negative value preserves sign
- buf_t_ i = -0x7FFFFFFE;
- assert( (i >> 1) == -0x3FFFFFFF );
-
- // casting to short truncates to 16 bits and sign-extends
- i = 0x18000;
- assert( (short) i == -0x8000 );
- #endif
-
- Blip_clear( this );
-}
-
-void Blip_clear( struct Blip_Buffer* this )
-{
- bool const entire_buffer = true;
-
- this->offset_ = 0;
- this->reader_accum_ = 0;
- this->modified = false;
-
- if ( this->buffer_ )
- {
- int count = (entire_buffer ? this->buffer_size_ : Blip_samples_avail( this ));
- memset( this->buffer_, 0, (count + blip_buffer_extra_) * sizeof (delta_t) );
- }
-}
-
-blargg_err_t Blip_set_sample_rate( struct Blip_Buffer* this, int new_rate, int msec )
-{
- // Limit to maximum size that resampled time can represent
- int max_size = (((blip_resampled_time_t) -1) >> BLIP_BUFFER_ACCURACY) -
- blip_buffer_extra_ - 64; // TODO: -64 isn't needed
- int new_size = (new_rate * (msec + 1) + 999) / 1000;
- if ( new_size > max_size )
- new_size = max_size;
-
- // Resize buffer
- if ( this->buffer_size_ != new_size ) {
- this->buffer_center_ = this->buffer_ + BLIP_MAX_QUALITY/2;
- this->buffer_size_ = new_size;
- }
-
- // update things based on the sample rate
- this->sample_rate_ = new_rate;
- this->length_ = new_size * 1000 / new_rate - 1;
- if ( this->clock_rate_ )
- Blip_set_clock_rate( this, this->clock_rate_ );
- Blip_bass_freq( this, this->bass_freq_ );
-
- Blip_clear( this );
-
- return 0; // success
-}
-
-blip_resampled_time_t Blip_clock_rate_factor( struct Blip_Buffer* this, int rate )
-{
- int factor = (int) ( this->sample_rate_ * (1LL << BLIP_BUFFER_ACCURACY) / rate);
- assert( factor > 0 || !this->sample_rate_ ); // fails if clock/output ratio is too large
- return (blip_resampled_time_t) factor;
-}
-
-void Blip_bass_freq( struct Blip_Buffer* this, int freq )
-{
- this->bass_freq_ = freq;
- int shift = 31;
- if ( freq > 0 && this->sample_rate_ )
- {
- shift = 13;
- int f = (freq << 16) / this->sample_rate_;
- while ( (f >>= 1) && --shift ) { }
- }
- this->bass_shift_ = shift;
-}
-
-void Blip_end_frame( struct Blip_Buffer* this, blip_time_t t )
-{
- this->offset_ += t * this->factor_;
- assert( Blip_samples_avail( this ) <= (int) this->buffer_size_ ); // time outside buffer length
-}
-
-int Blip_count_samples( struct Blip_Buffer* this, blip_time_t t )
-{
- blip_resampled_time_t last_sample = Blip_resampled_time( this, t ) >> BLIP_BUFFER_ACCURACY;
- blip_resampled_time_t first_sample = this->offset_ >> BLIP_BUFFER_ACCURACY;
- return (int) (last_sample - first_sample);
-}
-
-blip_time_t Blip_count_clocks( struct Blip_Buffer* this, int count )
-{
- if ( count > this->buffer_size_ )
- count = this->buffer_size_;
- blip_resampled_time_t time = (blip_resampled_time_t) count << BLIP_BUFFER_ACCURACY;
- return (blip_time_t) ((time - this->offset_ + this->factor_ - 1) / this->factor_);
-}
-
-void Blip_remove_samples( struct Blip_Buffer* this, int count )
-{
- if ( count )
- {
- Blip_remove_silence( this, count );
-
- // copy remaining samples to beginning and clear old samples
- int remain = Blip_samples_avail( this ) + blip_buffer_extra_;
- memmove( this->buffer_, this->buffer_ + count, remain * sizeof *this->buffer_ );
- memset( this->buffer_ + remain, 0, count * sizeof *this->buffer_ );
- }
-}
-
-int Blip_read_samples( struct Blip_Buffer* this, blip_sample_t out_ [], int max_samples, bool stereo )
-{
- int count = Blip_samples_avail( this );
- if ( count > max_samples )
- count = max_samples;
-
- if ( count )
- {
- int const bass = this->bass_shift_;
- delta_t const* reader = this->buffer_ + count;
- int reader_sum = this->reader_accum_;
-
- blip_sample_t* BLARGG_RESTRICT out = out_ + count;
- if ( stereo )
- out += count;
- int offset = -count;
-
- if ( !stereo )
- {
- do
- {
- int s = reader_sum >> delta_bits;
-
- reader_sum -= reader_sum >> bass;
- reader_sum += reader [offset];
-
- BLIP_CLAMP( s, s );
- out [offset] = (blip_sample_t) s;
- }
- while ( ++offset );
- }
- else
- {
- do
- {
- int s = reader_sum >> delta_bits;
-
- reader_sum -= reader_sum >> bass;
- reader_sum += reader [offset];
-
- BLIP_CLAMP( s, s );
- out [offset * 2] = (blip_sample_t) s;
- }
- while ( ++offset );
- }
-
- this->reader_accum_ = reader_sum;
-
- Blip_remove_samples( this, count );
- }
- return count;
-}
-
-void Blip_mix_samples( struct Blip_Buffer* this, blip_sample_t const in [], int count )
-{
- delta_t* out = this->buffer_center_ + (this->offset_ >> BLIP_BUFFER_ACCURACY);
-
- int const sample_shift = blip_sample_bits - 16;
- int prev = 0;
- while ( --count >= 0 )
- {
- int s = *in++ << sample_shift;
- *out += s - prev;
- prev = s;
- ++out;
- }
- *out -= prev;
-}
-
-// Blip_Synth
-
-void volume_unit( struct Blip_Synth* this, int new_unit )
-{
- this->delta_factor = (int) (new_unit * (1LL << blip_sample_bits) / FP_ONE_VOLUME);
-}
-
-void Synth_init( struct Blip_Synth* this )
-{
- this->buf = 0;
- this->last_amp = 0;
- this->delta_factor = 0;
-}