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Reduce memory consumption of VGM codec for low memry targets at the costs of some performance for tracks using the 2616 emulator.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30326 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2011-08-17 21:48:28 +00:00
parent 1da1b70e26
commit 4070f4f17b
2 changed files with 28 additions and 6 deletions
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26
apps/codecs/libgme/ym2612_emu.c
View file

@ -490,7 +490,7 @@ static void impl_set_rate( struct Ym2612_Impl* impl, double sample_rate, double
{
assert( sample_rate );
assert( !clock_rate || clock_rate > sample_rate );
int i;
// 144 = 12 * (prescale * 2) = 12 * 6 * 2
@ -505,6 +505,7 @@ static void impl_set_rate( struct Ym2612_Impl* impl, double sample_rate, double
// [0 - 4095] = +output [4095 - ...] = +output overflow (fill with 0)
// [12288 - 16383] = -output [16384 - ...] = -output overflow (fill with 0)
#ifdef YM2612_USE_TL_TAB
for ( i = 0; i < TL_LENGHT; i++ )
{
if (i >= PG_CUT_OFF) // YM2612 cut off sound after 78 dB (14 bits output ?)
@ -522,6 +523,7 @@ static void impl_set_rate( struct Ym2612_Impl* impl, double sample_rate, double
impl->g.TL_TAB [TL_LENGHT + i] = -impl->g.TL_TAB [i];
}
}
#endif
// Tableau SIN :
// impl->g.SIN_TAB [x] [y] = sin(x) * y;
@ -908,8 +910,24 @@ short const* const ENV_TAB = g->ENV_TAB; \
CALC_EN( 0 ) \
CALC_EN( 1 ) \
CALC_EN( 2 ) \
CALC_EN( 3 ) \
int const* const TL_TAB = g->TL_TAB;
CALC_EN( 3 )
#ifndef YM2612_USE_TL_TAB
static inline int tl_level( int i )
{
if (i >= (PG_CUT_OFF + TL_LENGHT)) {
return 0;
} else if (i >= TL_LENGHT) {
return -tl_coeff [i - TL_LENGHT];
} else if (i >= PG_CUT_OFF) {
return 0;
} else
return tl_coeff [i];
}
#define SINT( i, o ) (tl_level (g->SIN_TAB [(i)] + (o)))
#else
#define SINT( i, o ) (g->TL_TAB [g->SIN_TAB [(i)] + (o)])
#endif
#define DO_FEEDBACK \
int CH_S0_OUT_0 = ch->S0_OUT [0]; \
@ -919,8 +937,6 @@ int CH_S0_OUT_0 = ch->S0_OUT [0]; \
CH_S0_OUT_0 = SINT( (temp >> SIN_LBITS) & SIN_MASK, en0 ); \
} \
#define SINT( i, o ) (TL_TAB [g->SIN_TAB [(i)] + (o)])
#define DO_LIMIT \
CH_OUTd >>= MAX_OUT_BITS - output_bits + 2; \

8
apps/codecs/libgme/ym2612_emu.h
View file

@ -10,6 +10,10 @@
#define YM2612_CALCUL_TABLES
#endif
#if MEMORYSIZE > 2
#define YM2612_USE_TL_TAB
#endif
enum { ym2612_out_chan_count = 2 }; // stereo
enum { ym2612_channel_count = 6 };
enum { ym2612_disabled_time = -1 };
@ -172,7 +176,9 @@ struct tables_t
short LFO_ENV_TAB [LFO_LENGHT]; // LFO AMS TABLE (adjusted for 11.8 dB)
short LFO_FREQ_TAB [LFO_LENGHT]; // LFO FMS TABLE
#endif
int TL_TAB [TL_LENGHT * 2]; // TOTAL LEVEL TABLE (positif and minus)
#ifdef YM2612_USE_TL_TAB
int TL_TAB [TL_LENGHT * 2]; // TOTAL LEVEL TABLE (positif and minus)
#endif
unsigned int DECAY_TO_ATTACK [ENV_LENGHT]; // Conversion from decay to attack phase
unsigned int FINC_TAB [2048]; // Frequency step table
};