diff options
Diffstat (limited to 'apps/codecs/libwmapro/wmaprodec.c')
| -rw-r--r-- | apps/codecs/libwmapro/wmaprodec.c | 45 |
1 files changed, 25 insertions, 20 deletions
diff --git a/apps/codecs/libwmapro/wmaprodec.c b/apps/codecs/libwmapro/wmaprodec.c index 3431870297..b5540f7872 100644 --- a/apps/codecs/libwmapro/wmaprodec.c +++ b/apps/codecs/libwmapro/wmaprodec.c @@ -124,6 +124,11 @@ #define FFMIN(a,b) ((a) > (b) ? (b) : (a)) #define FFMAX(a,b) ((a) > (b) ? (a) : (b)) +/* Define some multiple used constants */ +#define SQRT2_FRACT24 0x016A09E6 /* 0x016A09E6 = (sqrt(2)*(1<<24)) */ +#define COS_PI4_FRACT16 0x0000B505 /* 0x0000B505 = (cos(pi/4)<<16) */ +#define ONE_FRACT16 0x00010000 /* 0x00010000 = (1<<16) */ + /* Enable multichannel for large-memory targets only */ #if (MEMORYSIZE > 2) #define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels @@ -646,9 +651,9 @@ static void decode_decorrelation_matrix(WMAProDecodeCtx *s, get_bits1(&s->gb) ? 1.0 : -1.0; if(chgroup->decorrelation_matrix[chgroup->num_channels * i + i] > 0) - chgroup->fixdecorrelation_matrix[chgroup->num_channels * i + i] = 0x10000; + chgroup->fixdecorrelation_matrix[chgroup->num_channels * i + i] = ONE_FRACT16; else - chgroup->fixdecorrelation_matrix[chgroup->num_channels * i + i] = -0x10000; + chgroup->fixdecorrelation_matrix[chgroup->num_channels * i + i] = -ONE_FRACT16; } for (i = 1; i < chgroup->num_channels; i++) { @@ -754,16 +759,16 @@ static int decode_channel_transform(WMAProDecodeCtx* s) } else { chgroup->transform = 1; if (s->num_channels == 2) { - chgroup->fixdecorrelation_matrix[0] = 0x10000; - chgroup->fixdecorrelation_matrix[1] = -0x10000; - chgroup->fixdecorrelation_matrix[2] = 0x10000; - chgroup->fixdecorrelation_matrix[3] = 0x10000; + chgroup->fixdecorrelation_matrix[0] = ONE_FRACT16; + chgroup->fixdecorrelation_matrix[1] = -ONE_FRACT16; + chgroup->fixdecorrelation_matrix[2] = ONE_FRACT16; + chgroup->fixdecorrelation_matrix[3] = ONE_FRACT16; } else { /** cos(pi/4) */ - chgroup->fixdecorrelation_matrix[0] = 0xB500; - chgroup->fixdecorrelation_matrix[1] = -0xB500; - chgroup->fixdecorrelation_matrix[2] = 0xB500; - chgroup->fixdecorrelation_matrix[3] = 0xB500; + chgroup->fixdecorrelation_matrix[0] = COS_PI4_FRACT16; + chgroup->fixdecorrelation_matrix[1] = -COS_PI4_FRACT16; + chgroup->fixdecorrelation_matrix[2] = COS_PI4_FRACT16; + chgroup->fixdecorrelation_matrix[3] = COS_PI4_FRACT16; } } } else if (chgroup->num_channels > 2) { @@ -858,19 +863,19 @@ static int decode_coeffs(WMAProDecodeCtx *s, int c) v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); if (v1 == HUFF_VEC1_SIZE - 1) v1 += ff_wma_get_large_val(&s->gb); - - vals[i] = v0; + + vals[i ] = v0; vals[i+1] = v1; } else { - vals[i] = symbol_to_vec2[idx] >> 4; + vals[i ] = symbol_to_vec2[idx] >> 4; vals[i+1] = symbol_to_vec2[idx] & 0xF; } } } else { - vals[0] = symbol_to_vec4[idx] >> 12; - vals[1] = (symbol_to_vec4[idx] >> 8) & 0xF; - vals[2] = (symbol_to_vec4[idx] >> 4) & 0xF; - vals[3] = symbol_to_vec4[idx] & 0xF; + vals[0] = (symbol_to_vec4[idx] >> 12); + vals[1] = (symbol_to_vec4[idx] >> 8) & 0xF; + vals[2] = (symbol_to_vec4[idx] >> 4) & 0xF; + vals[3] = (symbol_to_vec4[idx] ) & 0xF; } /** decode sign */ @@ -1042,14 +1047,14 @@ static void inverse_channel_transform(WMAProDecodeCtx *s) } } else if (s->num_channels == 2) { - /* Scale with sqrt(2). 0x016A09E6 = (sqrt(2)*(1<<24)) */ + /* Scale with sqrt(2) */ int len = FFMIN(sfb[1], s->subframe_len) - sfb[0]; vector_fixmul_scalar(ch_data[0] + sfb[0], ch_data[0] + sfb[0], - 0x016A09E6, len); + SQRT2_FRACT24, len); vector_fixmul_scalar(ch_data[1] + sfb[0], ch_data[1] + sfb[0], - 0x016A09E6, len); + SQRT2_FRACT24, len); } } |