diff options
Diffstat (limited to 'apps/dsp.c')
-rw-r--r-- | apps/dsp.c | 111 |
1 files changed, 61 insertions, 50 deletions
diff --git a/apps/dsp.c b/apps/dsp.c index 4ea2a0c3c4..94e825c532 100644 --- a/apps/dsp.c +++ b/apps/dsp.c | |||
@@ -32,10 +32,6 @@ | |||
32 | #include <dsp_asm.h> | 32 | #include <dsp_asm.h> |
33 | #endif | 33 | #endif |
34 | 34 | ||
35 | /* The "dither" code to convert the 24-bit samples produced by libmad was | ||
36 | * taken from the coolplayer project - coolplayer.sourceforge.net | ||
37 | */ | ||
38 | |||
39 | /* 16-bit samples are scaled based on these constants. The shift should be | 35 | /* 16-bit samples are scaled based on these constants. The shift should be |
40 | * no more than 15. | 36 | * no more than 15. |
41 | */ | 37 | */ |
@@ -180,6 +176,8 @@ struct dsp_config | |||
180 | int stereo_mode; | 176 | int stereo_mode; |
181 | int frac_bits; | 177 | int frac_bits; |
182 | bool dither_enabled; | 178 | bool dither_enabled; |
179 | long dither_bias; | ||
180 | long dither_mask; | ||
183 | bool new_gain; | 181 | bool new_gain; |
184 | bool crossfeed_enabled; | 182 | bool crossfeed_enabled; |
185 | bool eq_enabled; | 183 | bool eq_enabled; |
@@ -397,7 +395,7 @@ static long upsample(int32_t **dst, int32_t **src, int count, struct resample_da | |||
397 | int i = 0, j; | 395 | int i = 0, j; |
398 | int pos; | 396 | int pos; |
399 | int num_channels = dsp->stereo_mode == STEREO_MONO ? 1 : 2; | 397 | int num_channels = dsp->stereo_mode == STEREO_MONO ? 1 : 2; |
400 | 398 | ||
401 | while ((pos = phase >> 16) == 0) | 399 | while ((pos = phase >> 16) == 0) |
402 | { | 400 | { |
403 | for (j = 0; j < num_channels; j++) | 401 | for (j = 0; j < num_channels; j++) |
@@ -479,40 +477,60 @@ static inline long clip_sample(int32_t sample, int32_t min, int32_t max) | |||
479 | * taken from the coolplayer project - coolplayer.sourceforge.net | 477 | * taken from the coolplayer project - coolplayer.sourceforge.net |
480 | */ | 478 | */ |
481 | 479 | ||
482 | static long dither_sample(int32_t sample, int32_t bias, int32_t mask, | 480 | void dsp_dither_enable(bool enable) |
483 | struct dither_data* dither) | ||
484 | { | 481 | { |
485 | int32_t output; | 482 | dsp->dither_enabled = enable; |
486 | int32_t random; | 483 | } |
487 | int32_t min; | ||
488 | int32_t max; | ||
489 | |||
490 | /* Noise shape and bias */ | ||
491 | |||
492 | sample += dither->error[0] - dither->error[1] + dither->error[2]; | ||
493 | dither->error[2] = dither->error[1]; | ||
494 | dither->error[1] = dither->error[0] / 2; | ||
495 | |||
496 | output = sample + bias; | ||
497 | |||
498 | /* Dither */ | ||
499 | |||
500 | random = dither->random * 0x0019660dL + 0x3c6ef35fL; | ||
501 | sample += (random & mask) - (dither->random & mask); | ||
502 | dither->random = random; | ||
503 | |||
504 | /* Clip and quantize */ | ||
505 | |||
506 | min = dsp->clip_min; | ||
507 | max = dsp->clip_max; | ||
508 | sample = clip_sample(sample, min, max); | ||
509 | output = clip_sample(output, min, max) & ~mask; | ||
510 | 484 | ||
511 | /* Error feedback */ | 485 | static void dither_init(void) |
486 | { | ||
487 | memset(&dither_data[0], 0, sizeof(dither_data)); | ||
488 | memset(&dither_data[1], 0, sizeof(dither_data)); | ||
489 | dsp->dither_bias = (1L << (dsp->frac_bits - NATIVE_DEPTH)); | ||
490 | dsp->dither_mask = (1L << (dsp->frac_bits + 1 - NATIVE_DEPTH)) - 1; | ||
491 | } | ||
512 | 492 | ||
513 | dither->error[0] = sample - output; | 493 | static void dither_samples(int32_t* src, int num, struct dither_data* dither) |
494 | { | ||
495 | int32_t output, sample; | ||
496 | int32_t random; | ||
497 | int32_t min, max; | ||
498 | long mask = dsp->dither_mask; | ||
499 | long bias = dsp->dither_bias; | ||
500 | int i; | ||
501 | |||
502 | for (i = 0; i < num; ++i) { | ||
503 | /* Noise shape and bias */ | ||
504 | sample = src[i]; | ||
505 | sample += dither->error[0] - dither->error[1] + dither->error[2]; | ||
506 | dither->error[2] = dither->error[1]; | ||
507 | dither->error[1] = dither->error[0]/2; | ||
508 | |||
509 | output = sample + bias; | ||
510 | |||
511 | /* Dither */ | ||
512 | random = dither->random*0x0019660dL + 0x3c6ef35fL; | ||
513 | output += (random & mask) - (dither->random & mask); | ||
514 | dither->random = random; | ||
515 | |||
516 | /* Clip and quantize */ | ||
517 | min = dsp->clip_min; | ||
518 | max = dsp->clip_max; | ||
519 | if (output > max) { | ||
520 | output = max; | ||
521 | if (sample > max) | ||
522 | sample = max; | ||
523 | } else if (output < min) { | ||
524 | output = min; | ||
525 | if (sample < min) | ||
526 | sample = min; | ||
527 | } | ||
528 | output &= ~mask; | ||
514 | 529 | ||
515 | return output; | 530 | /* Error feedback */ |
531 | dither->error[0] = sample - output; | ||
532 | src[i] = output; | ||
533 | } | ||
516 | } | 534 | } |
517 | 535 | ||
518 | void dsp_set_crossfeed(bool enable) | 536 | void dsp_set_crossfeed(bool enable) |
@@ -740,7 +758,7 @@ static void apply_gain(int32_t* _src[], int _count) | |||
740 | 758 | ||
741 | void channels_set(int value) | 759 | void channels_set(int value) |
742 | { | 760 | { |
743 | channels_mode = value; | 761 | channels_mode = value; |
744 | } | 762 | } |
745 | 763 | ||
746 | void stereo_width_set(int value) | 764 | void stereo_width_set(int value) |
@@ -811,15 +829,13 @@ static void write_samples(short* dst, int32_t* src[], int count) | |||
811 | 829 | ||
812 | if (dsp->dither_enabled) | 830 | if (dsp->dither_enabled) |
813 | { | 831 | { |
814 | long bias = (1L << (dsp->frac_bits - NATIVE_DEPTH)); | 832 | dither_samples(src[0], count, &dither_data[0]); |
815 | long mask = (1L << scale) - 1; | 833 | dither_samples(src[1], count, &dither_data[1]); |
816 | 834 | ||
817 | while (count-- > 0) | 835 | while (count-- > 0) |
818 | { | 836 | { |
819 | *dst++ = (short) (dither_sample(*s0++, bias, mask, &dither_data[0]) | 837 | *dst++ = (short) (*s0++ >> scale); |
820 | >> scale); | 838 | *dst++ = (short) (*s1++ >> scale); |
821 | *dst++ = (short) (dither_sample(*s1++, bias, mask, &dither_data[1]) | ||
822 | >> scale); | ||
823 | } | 839 | } |
824 | } | 840 | } |
825 | else | 841 | else |
@@ -980,7 +996,7 @@ bool dsp_configure(int setting, void *value) | |||
980 | /* Fall through!!! */ | 996 | /* Fall through!!! */ |
981 | case DSP_SWITCH_FREQUENCY: | 997 | case DSP_SWITCH_FREQUENCY: |
982 | dsp->codec_frequency = ((long) value == 0) ? NATIVE_FREQUENCY : (long) value; | 998 | dsp->codec_frequency = ((long) value == 0) ? NATIVE_FREQUENCY : (long) value; |
983 | /* Account for playback speed adjustment when settingg dsp->frequency | 999 | /* Account for playback speed adjustment when setting dsp->frequency |
984 | if we're called from the main audio thread. Voice UI thread should | 1000 | if we're called from the main audio thread. Voice UI thread should |
985 | not need this feature. | 1001 | not need this feature. |
986 | */ | 1002 | */ |
@@ -1001,7 +1017,7 @@ bool dsp_configure(int setting, void *value) | |||
1001 | 1017 | ||
1002 | case DSP_SET_SAMPLE_DEPTH: | 1018 | case DSP_SET_SAMPLE_DEPTH: |
1003 | dsp->sample_depth = (long) value; | 1019 | dsp->sample_depth = (long) value; |
1004 | 1020 | ||
1005 | if (dsp->sample_depth <= NATIVE_DEPTH) | 1021 | if (dsp->sample_depth <= NATIVE_DEPTH) |
1006 | { | 1022 | { |
1007 | dsp->frac_bits = WORD_FRACBITS; | 1023 | dsp->frac_bits = WORD_FRACBITS; |
@@ -1017,6 +1033,7 @@ bool dsp_configure(int setting, void *value) | |||
1017 | dsp->clip_min = -(1 << (long)value); | 1033 | dsp->clip_min = -(1 << (long)value); |
1018 | } | 1034 | } |
1019 | 1035 | ||
1036 | dither_init(); | ||
1020 | break; | 1037 | break; |
1021 | 1038 | ||
1022 | case DSP_SET_STEREO_MODE: | 1039 | case DSP_SET_STEREO_MODE: |
@@ -1024,7 +1041,6 @@ bool dsp_configure(int setting, void *value) | |||
1024 | break; | 1041 | break; |
1025 | 1042 | ||
1026 | case DSP_RESET: | 1043 | case DSP_RESET: |
1027 | dsp->dither_enabled = false; | ||
1028 | dsp->stereo_mode = STEREO_NONINTERLEAVED; | 1044 | dsp->stereo_mode = STEREO_NONINTERLEAVED; |
1029 | dsp->clip_max = ((1 << WORD_FRACBITS) - 1); | 1045 | dsp->clip_max = ((1 << WORD_FRACBITS) - 1); |
1030 | dsp->clip_min = -((1 << WORD_FRACBITS)); | 1046 | dsp->clip_min = -((1 << WORD_FRACBITS)); |
@@ -1038,11 +1054,6 @@ bool dsp_configure(int setting, void *value) | |||
1038 | dsp->new_gain = true; | 1054 | dsp->new_gain = true; |
1039 | break; | 1055 | break; |
1040 | 1056 | ||
1041 | case DSP_DITHER: | ||
1042 | memset(dither_data, 0, sizeof(dither_data)); | ||
1043 | dsp->dither_enabled = (bool) value; | ||
1044 | break; | ||
1045 | |||
1046 | case DSP_SET_TRACK_GAIN: | 1057 | case DSP_SET_TRACK_GAIN: |
1047 | dsp->track_gain = (long) value; | 1058 | dsp->track_gain = (long) value; |
1048 | dsp->new_gain = true; | 1059 | dsp->new_gain = true; |