devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Submit a patch to the VGM codec by Mauricio Gama which saves some more RAM through changes of the buffer configuration and an update of the resampler code. Additionally enable VGM for low memory targets and update the manual.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30327 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2011-08-17 22:20:09 +00:00
parent 4070f4f17b
commit 4d01ace73f
6 changed files with 228 additions and 343 deletions
Download patch file Download diff file Expand all files Collapse all files

2
apps/codecs/SOURCES
View file

@ -37,8 +37,8 @@ gbs.c
hes.c hes.c
nsf.c nsf.c
sgc.c sgc.c
#if MEMORYSIZE > 2
vgm.c vgm.c
#if MEMORYSIZE > 2
kss.c kss.c
#endif #endif

396
apps/codecs/libgme/resampler.c
View file

@ -25,294 +25,194 @@ enum { shift = 14 };
int const unit = 1 << shift; int const unit = 1 << shift;
blargg_err_t Resampler_setup( struct Resampler* this, int fm_rate, int fm_gain, int rate, int gain ) blargg_err_t Resampler_setup( struct Resampler* this, int fm_rate, int fm_gain, int rate, int gain )
{ {
this->gain_ = (int)( ((1LL << gain_bits) * fm_gain * gain) / FP_ONE_GAIN ); this->gain_ = (int)( ((1LL << gain_bits) * fm_gain * gain) / FP_ONE_GAIN );
this->step = (int)( ((1LL << shift) * fm_rate) / rate + 1); this->step = (int)( ((1LL << shift) * fm_rate) / rate + 1);
this->rate_ = this->step; this->rate_ = this->step;
return 0; return 0;
} }
blargg_err_t Resampler_reset( struct Resampler* this, int pairs ) blargg_err_t Resampler_reset( struct Resampler* this, int pairs )
{ {
// expand allocations a bit // expand allocations a bit
Resampler_resize( this, pairs ); this->sample_buffer_size = (pairs + (pairs >> 2)) * 2;
this->resampler_size = this->oversamples_per_frame + (this->oversamples_per_frame >> 2); Resampler_resize( this, pairs );
this->resampler_size = this->oversamples_per_frame + (this->oversamples_per_frame >> 2);
this->buffer_size = this->resampler_size; this->buffer_size = this->resampler_size;
this->pos = 0; this->pos = 0;
this->write_pos = 0; this->write_pos = 0;
return 0;
Resampler_clear( this );
return 0;
} }
void Resampler_resize( struct Resampler* this, int pairs ) void Resampler_resize( struct Resampler* this, int pairs )
{ {
int new_sample_buf_size = pairs * 2; int new_sample_buf_size = pairs * 2;
if ( this->sample_buf_size != new_sample_buf_size ) if ( this->sample_buf_size != new_sample_buf_size )
{ {
this->sample_buf_size = new_sample_buf_size; if ( new_sample_buf_size > this->sample_buffer_size )
this->oversamples_per_frame = (int) ((pairs * this->rate_ * 2LL) / unit) + 2; {
Resampler_clear( this ); check(false);
} return;
}
this->sample_buf_size = new_sample_buf_size;
this->oversamples_per_frame = (int) ((pairs * this->rate_ * 2LL) / unit) + 2;
Resampler_clear( this );
}
} }
static void mix_mono( struct Resampler* this, struct Stereo_Buffer* stereo_buf, dsample_t* out_ ) void mix_samples( struct Resampler* this, struct Blip_Buffer* blip_buf, sample_t out_ [] )
{ {
int const bass = BLIP_READER_BASS( stereo_buf->bufs [0] ); int const bass = BLIP_READER_BASS( *blip_buf );
BLIP_READER_BEGIN( sn, stereo_buf->bufs [0] ); BLIP_READER_BEGIN( sn, *blip_buf );
int count = this->sample_buf_size >> 1; int count = this->sample_buf_size >> 1;
BLIP_READER_ADJ_( sn, count ); BLIP_READER_ADJ_( sn, count );
typedef dsample_t stereo_dsample_t [2]; typedef sample_t stereo_dsample_t [2];
stereo_dsample_t* BLARGG_RESTRICT out = (stereo_dsample_t*) out_ + count; stereo_dsample_t* BLARGG_RESTRICT out = (stereo_dsample_t*) out_ + count;
stereo_dsample_t const* BLARGG_RESTRICT in = stereo_dsample_t const* BLARGG_RESTRICT in =
(stereo_dsample_t const*) this->sample_buf + count; (stereo_dsample_t const*) this->sample_buf + count;
int offset = -count; int offset = -count;
int const gain = this->gain_; int const gain = this->gain_;
do do
{ {
int s = BLIP_READER_READ_RAW( sn ) >> (blip_sample_bits - 16); int s = BLIP_READER_READ_RAW( sn ) >> (blip_sample_bits - 16);
BLIP_READER_NEXT_IDX_( sn, bass, offset ); BLIP_READER_NEXT_IDX_( sn, bass, offset );
int l = (in [offset] [0] * gain >> gain_bits) + s; int l = (in [offset] [0] * gain >> gain_bits) + s;
int r = (in [offset] [1] * gain >> gain_bits) + s; int r = (in [offset] [1] * gain >> gain_bits) + s;
BLIP_CLAMP( l, l ); BLIP_CLAMP( l, l );
out [offset] [0] = (blip_sample_t) l; out [offset] [0] = (blip_sample_t) l;
BLIP_CLAMP( r, r ); BLIP_CLAMP( r, r );
out [offset] [1] = (blip_sample_t) r; out [offset] [1] = (blip_sample_t) r;
} }
while ( ++offset ); while ( ++offset );
BLIP_READER_END( sn, stereo_buf->bufs [0] ); BLIP_READER_END( sn, *blip_buf );
} }
static void mix_stereo( struct Resampler* this, struct Stereo_Buffer* stereo_buf, dsample_t* out_ ) sample_t const* resample_( struct Resampler* this, sample_t** out_,
sample_t const* out_end, sample_t const in [], int in_size )
{ {
int const bass = BLIP_READER_BASS( stereo_buf->bufs [0] ); in_size -= write_offset;
BLIP_READER_BEGIN( snc, stereo_buf->bufs [0] ); if ( in_size > 0 )
BLIP_READER_BEGIN( snl, stereo_buf->bufs [1] ); {
BLIP_READER_BEGIN( snr, stereo_buf->bufs [2] ); sample_t* BLARGG_RESTRICT out = *out_;
sample_t const* const in_end = in + in_size;
int count = this->sample_buf_size >> 1; int const step = this->step;
BLIP_READER_ADJ_( snc, count ); int pos = this->pos;
BLIP_READER_ADJ_( snl, count );
BLIP_READER_ADJ_( snr, count );
typedef dsample_t stereo_dsample_t [2]; // TODO: IIR filter, then linear resample
stereo_dsample_t* BLARGG_RESTRICT out = (stereo_dsample_t*) out_ + count; // TODO: detect skipped sample, allowing merging of IIR and resample?
stereo_dsample_t const* BLARGG_RESTRICT in =
(stereo_dsample_t const*) this->sample_buf + count;
int offset = -count;
int const gain = this->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; do
int r = (in [offset] [1] * gain >> gain_bits) + sr + sc; {
#define INTERP( i, out )\
out = (in [0 + i] * (unit - pos) + ((in [2 + i] + in [4 + i] + in [6 + i]) << shift) +\
in [8 + i] * pos) >> (shift + 2);
BLIP_CLAMP( l, l ); int out_0;
out [offset] [0] = (blip_sample_t) l; INTERP( 0, out_0 )
INTERP( 1, out [0] = out_0; out [1] )
out += stereo;
BLIP_CLAMP( r, r ); pos += step;
out [offset] [1] = (blip_sample_t) r; in += ((unsigned) pos >> shift) * stereo;
} pos &= unit - 1;
while ( ++offset ); }
while ( in < in_end && out < out_end );
BLIP_READER_END( snc, stereo_buf->bufs [0] ); this->pos = pos;
BLIP_READER_END( snl, stereo_buf->bufs [1] ); *out_ = out;
BLIP_READER_END( snr, stereo_buf->bufs [2] ); }
return in;
} }
static void mix_stereo_no_center( struct Resampler* this, struct Stereo_Buffer* stereo_buf, dsample_t* out_ ) inline int resample_wrapper( struct Resampler* this, sample_t out [], int* out_size,
sample_t const in [], int in_size )
{ {
int const bass = BLIP_READER_BASS( stereo_buf->bufs [0] ); assert( Resampler_rate( this ) );
BLIP_READER_BEGIN( snl, stereo_buf->bufs [1] );
BLIP_READER_BEGIN( snr, stereo_buf->bufs [2] );
int count = this->sample_buf_size >> 1; sample_t* out_ = out;
BLIP_READER_ADJ_( snl, count ); int result = resample_( this, &out_, out + *out_size, in, in_size ) - in;
BLIP_READER_ADJ_( snr, count ); assert( out_ <= out + *out_size );
assert( result <= in_size );
typedef dsample_t stereo_dsample_t [2]; *out_size = out_ - out;
stereo_dsample_t* BLARGG_RESTRICT out = (stereo_dsample_t*) out_ + count; return result;
stereo_dsample_t const* BLARGG_RESTRICT in =
(stereo_dsample_t const*) this->sample_buf + count;
int offset = -count;
int const gain = this->gain_;
do
{
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_( snl, bass, offset );
BLIP_READER_NEXT_IDX_( snr, bass, offset );
int l = (in [offset] [0] * gain >> gain_bits) + sl;
int r = (in [offset] [1] * gain >> gain_bits) + sr;
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( snl, stereo_buf->bufs [1] );
BLIP_READER_END( snr, stereo_buf->bufs [2] );
} }
static dsample_t const* resample_( struct Resampler* this, dsample_t** out_, int skip_input( struct Resampler* this, int count )
dsample_t const* out_end, dsample_t const in [], int in_size )
{ {
in_size -= write_offset; this->write_pos -= count;
if ( in_size > 0 ) if ( this->write_pos < 0 ) // occurs when downsampling
{ {
dsample_t* BLIP_RESTRICT out = *out_; count += this->write_pos;
dsample_t const* const in_end = in + in_size; this->write_pos = 0;
}
int const step = this->step; memmove( this->buf, &this->buf [count], this->write_pos * sizeof this->buf [0] );
int pos = this->pos; return count;
// TODO: IIR filter, then linear resample
// TODO: detect skipped sample, allowing merging of IIR and resample?
do
{
#define INTERP( i, out )\
out = (in [0 + i] * (unit - pos) + ((in [2 + i] + in [4 + i] + in [6 + i]) << shift) +\
in [8 + i] * pos) >> (shift + 2);
int out_0;
INTERP( 0, out_0 )
INTERP( 1, out [0] = out_0; out [1] )
out += stereo;
pos += step;
in += ((unsigned) pos >> shift) * stereo;
pos &= unit - 1;
}
while ( in < in_end && out < out_end );
this->pos = pos;
*out_ = out;
}
return in;
} }
static inline int resample_wrapper( struct Resampler* this, dsample_t out [], int* out_size, void play_frame_( struct Resampler* this, struct Blip_Buffer* blip_buf, sample_t* out )
dsample_t const in [], int in_size )
{ {
assert( Resampler_rate( this ) ); int pair_count = this->sample_buf_size >> 1;
blip_time_t blip_time = Blip_count_clocks( blip_buf, pair_count );
int sample_count = this->oversamples_per_frame - this->write_pos + resampler_extra;
dsample_t* out_ = out; int new_count = this->callback( this->callback_data, blip_time, sample_count, &this->buf [this->write_pos] );
int result = resample_( this, &out_, out + *out_size, in, in_size ) - in; assert( new_count < this->resampler_size );
assert( out_ <= out + *out_size );
assert( result <= in_size );
*out_size = out_ - out; Blip_end_frame( blip_buf, blip_time );
return result; assert( Blip_samples_avail( blip_buf ) == pair_count );
this->write_pos += new_count;
assert( (unsigned) this->write_pos <= this->buffer_size );
int count = this->sample_buf_size;
if ( count )
skip_input( this, resample_wrapper( this, this->sample_buf, &count, this->buf, this->write_pos ) );
assert( count == this->sample_buf_size );
mix_samples( this, blip_buf, out );
Blip_remove_samples( blip_buf, pair_count );
} }
static int skip_input( struct Resampler* this, int count ) void Resampler_play( struct Resampler* this, int count, sample_t* out, struct Blip_Buffer* blip_buf )
{ {
this->write_pos -= count; // empty extra buffer
if ( this->write_pos < 0 ) // occurs when downsampling int remain = this->sample_buf_size - this->buf_pos;
{ if ( remain )
count += this->write_pos; {
this->write_pos = 0; if ( remain > count )
} remain = count;
memmove( this->buf, &this->buf [count], this->write_pos * sizeof this->buf [0] ); count -= remain;
return count; memcpy( out, &this->sample_buf [this->buf_pos], remain * sizeof *out );
} out += remain;
this->buf_pos += remain;
static void play_frame_( struct Resampler* this, struct Stereo_Buffer* stereo_buf, dsample_t* out ) }
{
long pair_count = this->sample_buf_size >> 1; // entire frames
blip_time_t blip_time = Blip_count_clocks( &stereo_buf->bufs [0], pair_count ); while ( count >= this->sample_buf_size )
int sample_count = this->oversamples_per_frame - this->write_pos + resampler_extra; {
play_frame_( this, blip_buf, out );
int new_count = this->callback( this->callback_data, blip_time, sample_count, &this->buf [this->write_pos] ); out += this->sample_buf_size;
assert( new_count < resampler_size ); count -= this->sample_buf_size;
}
Buffer_end_frame( stereo_buf, blip_time );
/* Blip_end_frame( &stereo_buf->bufs [0], blip_time ); */ // extra
assert( Blip_samples_avail( &stereo_buf->bufs [0] ) == pair_count * 2 ); if ( count )
{
this->write_pos += new_count; play_frame_( this, blip_buf, this->sample_buf );
assert( (unsigned) this->write_pos <= this->buffer_size ); this->buf_pos = count;
memcpy( out, this->sample_buf, count * sizeof *out );
new_count = this->sample_buf_size; out += count;
if ( new_count ) }
skip_input( this, resample_wrapper( this, this->sample_buf, &new_count, this->buf, this->write_pos ) );
assert( new_count == (long) this->sample_buf_size );
int bufs_used = stereo_buf->stereo_added | stereo_buf->was_stereo;
if ( bufs_used <= 1 ) {
mix_mono( this, stereo_buf, out );
Blip_remove_samples( &stereo_buf->bufs [0], pair_count );
Blip_remove_silence( &stereo_buf->bufs [1], pair_count );
Blip_remove_silence( &stereo_buf->bufs [2], pair_count );
}
else if ( bufs_used & 1 ) {
mix_stereo( this, stereo_buf, out );
Blip_remove_samples( &stereo_buf->bufs [0], pair_count );
Blip_remove_samples( &stereo_buf->bufs [1], pair_count );
Blip_remove_samples( &stereo_buf->bufs [2], pair_count );
}
else {
mix_stereo_no_center( this, stereo_buf, out );
Blip_remove_silence( &stereo_buf->bufs [0], pair_count );
Blip_remove_samples( &stereo_buf->bufs [1], pair_count );
Blip_remove_samples( &stereo_buf->bufs [2], pair_count );
}
// to do: this might miss opportunities for optimization
if ( !Blip_samples_avail( &stereo_buf->bufs [0] ) )
{
stereo_buf->was_stereo = stereo_buf->stereo_added;
stereo_buf->stereo_added = 0;
}
/* mix_mono( this, stereo_buf, out );
Blip_remove_samples( &stereo_buf->bufs [0], pair_count ); */
}
void Resampler_play( struct Resampler* this, long count, dsample_t* out, struct Stereo_Buffer* stereo_buf )
{
// empty extra buffer
long remain = this->sample_buf_size - this->buf_pos;
if ( remain )
{
if ( remain > count )
remain = count;
count -= remain;
memcpy( out, &this->sample_buf [this->buf_pos], remain * sizeof *out );
out += remain;
this->buf_pos += remain;
}
// entire frames
while ( count >= (long) this->sample_buf_size )
{
play_frame_( this, stereo_buf, out );
out += this->sample_buf_size;
count -= this->sample_buf_size;
}
// extra
if ( count )
{
play_frame_( this, stereo_buf, this->sample_buf );
this->buf_pos = count;
memcpy( out, this->sample_buf, count * sizeof *out );
out += count;
}
} }

64
apps/codecs/libgme/resampler.h
View file

@ -4,10 +4,10 @@
#ifndef RESAMPLER_H #ifndef RESAMPLER_H
#define RESAMPLER_H #define RESAMPLER_H
#include "blargg_config.h" #include "blargg_common.h"
#include "multi_buffer.h" #include "multi_buffer.h"
typedef short dsample_t; typedef short sample_t;
enum { stereo = 2 }; enum { stereo = 2 };
enum { max_buf_size = 3960 }; enum { max_buf_size = 3960 };
@ -16,53 +16,61 @@ enum { write_offset = 8 * stereo };
enum { gain_bits = 14 }; enum { gain_bits = 14 };
struct Resampler { struct Resampler {
int (*callback)( void*, blip_time_t, int, dsample_t* ); int (*callback)( void*, blip_time_t, int, sample_t* );
void* callback_data; void* callback_data;
dsample_t sample_buf [max_buf_size]; int sample_buffer_size;
int sample_buf_size; int sample_buf_size;
int oversamples_per_frame; int oversamples_per_frame;
int buf_pos; int buf_pos;
int resampler_size; int resampler_size;
int gain_; int gain_;
// Internal resampler int buffer_size;
dsample_t buf [max_resampler_size]; int write_pos;
int buffer_size;
int write_pos; int pos;
int rate_; int step;
int pos; int rate_;
int step;
sample_t sample_buf [max_buf_size];
sample_t buf [max_resampler_size]; // Internal resampler
}; };
static inline void Resampler_init( struct Resampler* this ) static inline void Resampler_init( struct Resampler* this )
{ {
this->pos = 0; this->pos = 0;
this->write_pos = 0; this->write_pos = 0;
this->rate_ = 0; this->rate_ = 0;
this->sample_buf_size = 0;
this->sample_buffer_size = 0;
this->oversamples_per_frame = 0;
} }
blargg_err_t Resampler_reset( struct Resampler* this, int max_pairs ); blargg_err_t Resampler_reset( struct Resampler* this, int max_pairs );
void Resampler_resize( struct Resampler* this, int pairs_per_frame ); void Resampler_resize( struct Resampler* this, int pairs_per_frame );
void Resampler_play( struct Resampler* this, int count, sample_t* out, struct Blip_Buffer* );
void Resampler_play( struct Resampler* this, long count, dsample_t* out, struct Stereo_Buffer* ); static inline void Resampler_set_callback(struct Resampler* this, int (*func)( void*, blip_time_t, int, sample_t* ), void* user_data )
static inline void Resampler_set_callback(struct Resampler* this, int (*func)( void*, blip_time_t, int, dsample_t* ), void* user_data )
{ {
this->callback = func; this->callback = func;
this->callback_data = user_data; this->callback_data = user_data;
} }
blargg_err_t Resampler_setup( struct Resampler* this, int fm_rate, int fm_gain, int rate, int gain ); blargg_err_t Resampler_setup( struct Resampler* this, int fm_rate, int fm_gain, int rate, int gain );
static inline void Resampler_clear( struct Resampler* this ) static inline void Resampler_clear( struct Resampler* this )
{ {
this->buf_pos = this->sample_buf_size; this->buf_pos = this->sample_buf_size;
this->pos = 0; this->pos = 0;
this->write_pos = 0; this->write_pos = 0;
}
static inline int Resampler_rate( struct Resampler* this )
{
return this->rate_;
} }
#endif #endif

59
apps/codecs/libgme/vgm_emu.c
View file

@ -89,8 +89,7 @@ void Vgm_init( struct Vgm_Emu* this )
Synth_init( &this->pcm ); Synth_init( &this->pcm );
Buffer_init( &this->buf ); Buffer_init( &this->buf );
Buffer_init( &this->stereo_buf ); Blip_init( &this->blip_buf );
this->blip_buf = &this->stereo_buf.bufs [0];
// Init fm chips // Init fm chips
Ym2413_init( &this->ym2413 ); Ym2413_init( &this->ym2413 );
@ -279,7 +278,7 @@ blargg_err_t Vgm_load_mem( struct Vgm_Emu* this, byte const* new_data, long new_
if ( !this->psg_rate ) if ( !this->psg_rate )
this->psg_rate = 3579545; this->psg_rate = 3579545;
Buffer_clock_rate( &this->stereo_buf, this->psg_rate ); Blip_set_clock_rate( &this->blip_buf, this->psg_rate );
// Disable FM // Disable FM
this->fm_rate = 0; this->fm_rate = 0;
@ -342,14 +341,14 @@ blargg_err_t setup_fm( struct Vgm_Emu* this )
{ {
int fm_rate = 0; int fm_rate = 0;
if ( !this->disable_oversampling ) if ( !this->disable_oversampling )
this->fm_rate = (this->sample_rate * 3) / 2; // oversample factor = 1.5 fm_rate = (this->sample_rate * 3) / 2; // oversample factor = 1.5
RETURN_ERR( init_fm( this, &fm_rate ) ); RETURN_ERR( init_fm( this, &fm_rate ) );
if ( uses_fm( this ) ) if ( uses_fm( this ) )
{ {
this->voice_count = 8; this->voice_count = 8;
RETURN_ERR( Resampler_setup( &this->resampler, fm_rate, fm_gain, this->sample_rate, this->gain ) ); RETURN_ERR( Resampler_setup( &this->resampler, fm_rate, fm_gain, this->sample_rate, this->gain ) );
RETURN_ERR( Resampler_reset( &this->resampler, Buffer_length( &this->stereo_buf ) * this->sample_rate / 1000 ) ); RETURN_ERR( Resampler_reset( &this->resampler, Blip_length( &this->blip_buf ) * this->sample_rate / 1000 ) );
Sms_apu_volume( &this->psg, ((this->gain/5)-(this->gain*5)/1000) * fm_gain ); Sms_apu_volume( &this->psg, ((this->gain/5)-(this->gain*5)/1000) * fm_gain );
} }
else else
@ -399,7 +398,7 @@ static blargg_err_t play_( struct Vgm_Emu* this, long count, sample_t* out )
return 0; return 0;
} }
Resampler_play( &this->resampler, count, out, &this->stereo_buf ); Resampler_play( &this->resampler, count, out, &this->blip_buf );
return 0; return 0;
} }
@ -428,19 +427,16 @@ static inline blip_time_t to_psg_time( struct Vgm_Emu* this, vgm_time_t t )
static void write_pcm( struct Vgm_Emu* this, vgm_time_t vgm_time, int amp ) static void write_pcm( struct Vgm_Emu* this, vgm_time_t vgm_time, int amp )
{ {
if ( this->blip_buf ) check( amp >= 0 );
{ blip_time_t blip_time = to_psg_time( this, vgm_time );
check( amp >= 0 ); int old = this->dac_amp;
blip_time_t blip_time = to_psg_time( this, vgm_time ); int delta = amp - old;
int old = this->dac_amp; this->dac_amp = amp;
int delta = amp - old; Blip_set_modified( &this->blip_buf );
this->dac_amp = amp; if ( old >= 0 ) // first write is ignored, to avoid click
Blip_set_modified( this->blip_buf ); Synth_offset_inline( &this->pcm, blip_time, delta, &this->blip_buf );
if ( old >= 0 ) // first write is ignored, to avoid click else
Synth_offset_inline( &this->pcm, blip_time, delta, this->blip_buf ); this->dac_amp |= this->dac_disabled;
else
this->dac_amp |= this->dac_disabled;
}
} }
blip_time_t run( struct Vgm_Emu* this, vgm_time_t end_time ) blip_time_t run( struct Vgm_Emu* this, vgm_time_t end_time )
@ -514,22 +510,7 @@ blip_time_t run( struct Vgm_Emu* this, vgm_time_t end_time )
case cmd_ym2612_port1: case cmd_ym2612_port1:
if ( Ym2612_run_until( &this->ym2612, to_fm_time( this, vgm_time ) ) ) if ( Ym2612_run_until( &this->ym2612, to_fm_time( this, vgm_time ) ) )
{
if ( pos [0] == ym2612_dac_pan_port )
{
struct Blip_Buffer* blip_buf = NULL;
switch ( pos [1] >> 6 )
{
case 0: blip_buf = NULL; break;
case 1: blip_buf = &this->stereo_buf.bufs [2]; break;
case 2: blip_buf = &this->stereo_buf.bufs [1]; break;
case 3: blip_buf = &this->stereo_buf.bufs [0]; break;
}
this->blip_buf = blip_buf;
}
Ym2612_write1( &this->ym2612, pos [0], pos [1] ); Ym2612_write1( &this->ym2612, pos [0], pos [1] );
}
pos += 2; pos += 2;
break; break;
@ -664,7 +645,7 @@ void update_fm_rates( struct Vgm_Emu* this, int* ym2413_rate, int* ym2612_rate )
blargg_err_t Vgm_set_sample_rate( struct Vgm_Emu* this, long rate ) blargg_err_t Vgm_set_sample_rate( struct Vgm_Emu* this, long rate )
{ {
require( !this->sample_rate ); // sample rate can't be changed once set require( !this->sample_rate ); // sample rate can't be changed once set
RETURN_ERR( Buffer_set_sample_rate( &this->stereo_buf, rate, 1000 / 30 ) ); RETURN_ERR( Blip_set_sample_rate( &this->blip_buf, rate, 1000 / 30 ) );
RETURN_ERR( Buffer_set_sample_rate( &this->buf, rate, 1000 / 20 ) ); RETURN_ERR( Buffer_set_sample_rate( &this->buf, rate, 1000 / 20 ) );
// Set bass frequency // Set bass frequency
@ -712,7 +693,7 @@ void Sound_mute_voices( struct Vgm_Emu* this, int mask )
if ( uses_fm( this ) ) if ( uses_fm( this ) )
{ {
for ( i = sms_osc_count; --i >= 0; ) for ( i = sms_osc_count; --i >= 0; )
Sms_apu_set_output( &this->psg, i, ( mask & 0x80 ) ? 0 : &this->stereo_buf.bufs [0], NULL, NULL ); Sms_apu_set_output( &this->psg, i, ( mask & 0x80 ) ? 0 : &this->blip_buf, NULL, NULL );
if ( Ym2612_enabled( &this->ym2612 ) ) if ( Ym2612_enabled( &this->ym2612 ) )
{ {
Synth_volume( &this->pcm, (mask & 0x40) ? 0 : (int)((long long)(0.1115*FP_ONE_VOLUME) / 256 * fm_gain * this->gain / FP_ONE_VOLUME) ); Synth_volume( &this->pcm, (mask & 0x40) ? 0 : (int)((long long)(0.1115*FP_ONE_VOLUME) / 256 * fm_gain * this->gain / FP_ONE_VOLUME) );
@ -743,7 +724,7 @@ void Sound_set_tempo( struct Vgm_Emu* this, int t )
if ( this->file_begin ) if ( this->file_begin )
{ {
this->vgm_rate = (long) ((44100LL * t) / FP_ONE_TEMPO); this->vgm_rate = (long) ((44100LL * t) / FP_ONE_TEMPO);
this->blip_time_factor = (int) (((1LL << blip_time_bits) * Blip_clock_rate( &this->stereo_buf.bufs [0] )) / this->vgm_rate); this->blip_time_factor = (int) (((1LL << blip_time_bits) * Blip_clock_rate( &this->blip_buf )) / this->vgm_rate);
//debug_printf( "blip_time_factor: %ld\n", blip_time_factor ); //debug_printf( "blip_time_factor: %ld\n", blip_time_factor );
//debug_printf( "vgm_rate: %ld\n", vgm_rate ); //debug_printf( "vgm_rate: %ld\n", vgm_rate );
// TODO: remove? calculates vgm_rate more accurately (above differs at most by one Hz only) // TODO: remove? calculates vgm_rate more accurately (above differs at most by one Hz only)
@ -761,8 +742,6 @@ blargg_err_t Vgm_start_track( struct Vgm_Emu* this )
Sms_apu_reset( &this->psg, get_le16( header( this )->noise_feedback ), header( this )->noise_width ); Sms_apu_reset( &this->psg, get_le16( header( this )->noise_feedback ), header( this )->noise_width );
this->blip_buf = &this->stereo_buf.bufs [0];
this->dac_disabled = -1; this->dac_disabled = -1;
this->pos = this->file_begin + header_size; this->pos = this->file_begin + header_size;
this->pcm_data = this->pos; this->pcm_data = this->pos;
@ -785,7 +764,7 @@ blargg_err_t Vgm_start_track( struct Vgm_Emu* this )
if ( Ym2612_enabled( &this->ym2612 ) ) if ( Ym2612_enabled( &this->ym2612 ) )
Ym2612_reset( &this->ym2612 ); Ym2612_reset( &this->ym2612 );
Buffer_clear( &this->stereo_buf ); Blip_clear( &this->blip_buf, 1 );
Resampler_clear( &this->resampler ); Resampler_clear( &this->resampler );
} }

6
apps/codecs/libgme/vgm_emu.h
View file

@ -12,7 +12,6 @@
#include "ym2612_emu.h" #include "ym2612_emu.h"
#include "sms_apu.h" #include "sms_apu.h"
typedef short sample_t;
typedef int vgm_time_t; typedef int vgm_time_t;
typedef int fm_time_t; typedef int fm_time_t;
@ -85,7 +84,7 @@ struct Vgm_Emu {
int dac_amp; int dac_amp;
int dac_disabled; // -1 if disabled int dac_disabled; // -1 if disabled
struct Blip_Buffer* blip_buf; struct Blip_Buffer blip_buf;
// general // general
long clock_rate_; long clock_rate_;
@ -124,10 +123,7 @@ struct Vgm_Emu {
struct Sms_Apu psg; struct Sms_Apu psg;
struct Blip_Synth pcm; struct Blip_Synth pcm;
struct Stereo_Buffer stereo_buf;
struct Resampler resampler; struct Resampler resampler;
struct Stereo_Buffer buf; struct Stereo_Buffer buf;
}; };

6
manual/appendix/file_formats.tex
View file

@ -227,13 +227,12 @@
& \fname{.sgc} & \fname{.sgc}
& Supports Sega Master System and Game Gear Sound Format. & Supports Sega Master System and Game Gear Sound Format.
Progress bar and seek use subtracks instead of seconds.\\ Progress bar and seek use subtracks instead of seconds.\\
\nopt{clipv1,c200v2}{
Video Game Music Format Video Game Music Format
& \fname{.vgm} & \fname{.vgm}
& \\ & \\
Gzipped Video Game Music Format Gzipped Video Game Music Format
& \fname{.vgz} & \fname{.vgz}
& \\} & \\
MOD MOD
& \fname{.mod} & \fname{.mod}
& \\ & \\
@ -251,6 +250,9 @@
& \\ & \\
\end{rbtabular} \end{rbtabular}
\note{NSF and VGM might not play in realtime on all devices due to CPU
performance requirements.}
\subsection{Codec featureset} \subsection{Codec featureset}
\begin{rbtabular}{.95\textwidth}{lXXX}% \begin{rbtabular}{.95\textwidth}{lXXX}%
{\textbf{Format} & \textbf{Seek} & \textbf{Resume} & \textbf{Gapless}}{}{} {\textbf{Format} & \textbf{Seek} & \textbf{Resume} & \textbf{Gapless}}{}{}