mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-26 03:01:50 +01:00
[Core/Sound] optimized Blip Buffer implementation for stereo streams (thanks to David Knight for original idea)
This commit is contained in:
EkeEke
parent
eedbfecac9
commit
41285e1131
@ -27,7 +27,7 @@ INCLUDES := core core/m68k core/z80 core/sound core/tremor core/ntsc core/input_
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# options for code generation
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#---------------------------------------------------------------------------------
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CFLAGS = -O3 -fomit-frame-pointer -Wall -Wno-strict-aliasing $(MACHDEP) $(INCLUDE) -DUSE_LIBTREMOR -DDISABLE_MANY_OGG_OPEN_FILES -DUSE_16BPP_RENDERING -DALT_RENDERER
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CFLAGS = -O3 -fomit-frame-pointer -Wall -Wno-strict-aliasing $(MACHDEP) $(INCLUDE) -DUSE_LIBTREMOR -DDISABLE_MANY_OGG_OPEN_FILES -DUSE_16BPP_RENDERING -DALT_RENDERER -DBLIP_INVERT
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CXXFLAGS = $(CFLAGS)
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LDFLAGS = $(MACHDEP) -Wl,-Map,$(notdir $@).map
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@ -27,7 +27,7 @@ INCLUDES := core core/m68k core/z80 core/sound core/tremor core/ntsc core/input_
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# options for code generation
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#---------------------------------------------------------------------------------
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CFLAGS = -O3 -fomit-frame-pointer -Wall -Wno-strict-aliasing $(MACHDEP) $(INCLUDE) -DUSE_LIBTREMOR -DUSE_16BPP_RENDERING -DALT_RENDERER -DHW_RVL
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CFLAGS = -O3 -fomit-frame-pointer -Wall -Wno-strict-aliasing $(MACHDEP) $(INCLUDE) -DUSE_LIBTREMOR -DUSE_16BPP_RENDERING -DALT_RENDERER -DBLIP_INVERT -DHW_RVL
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CXXFLAGS = $(CFLAGS)
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LDFLAGS = $(MACHDEP) -Wl,-Map,$(notdir $@).map,-wrap,wiiuse_set_ir,-wrap,wiiuse_handshake,-wrap,classic_ctrl_handshake,-wrap,classic_ctrl_event
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@ -179,8 +179,7 @@ void cdd_init(int samplerate)
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{
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/* CD-DA is running by default at 44100 Hz */
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/* Audio stream is resampled to desired rate using Blip Buffer */
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blip_set_rates(snd.blips[2][0], 44100, samplerate);
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blip_set_rates(snd.blips[2][1], 44100, samplerate);
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blip_set_rates(snd.blips[2], 44100, samplerate);
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}
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void cdd_reset(void)
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@ -1059,16 +1058,16 @@ void cdd_read_data(uint8 *dst)
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void cdd_read_audio(unsigned int samples)
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{
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/* previous audio outputs */
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int16 l = cdd.audio[0];
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int16 r = cdd.audio[1];
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int prev_l = cdd.audio[0];
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int prev_r = cdd.audio[1];
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/* get number of internal clocks (samples) needed */
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samples = blip_clocks_needed(snd.blips[2][0], samples);
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samples = blip_clocks_needed(snd.blips[2], samples);
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/* audio track playing ? */
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if (!scd.regs[0x36>>1].byte.h && cdd.toc.tracks[cdd.index].fd)
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{
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int i, mul, delta;
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int i, mul, l, r;
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/* current CD-DA fader volume */
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int curVol = cdd.volume;
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@ -1106,17 +1105,13 @@ void cdd_read_audio(unsigned int samples)
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/* (MIN) 0,1,2,3,4,8,12,16,20...,1020,1024 (MAX) */
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mul = (curVol & 0x7fc) ? (curVol & 0x7fc) : (curVol & 0x03);
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/* left channel */
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delta = ((ptr[0] * mul) / 1024) - l;
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ptr++;
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l += delta;
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blip_add_delta_fast(snd.blips[2][0], i, delta);
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/* right channel */
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delta = ((ptr[0] * mul) / 1024) - r;
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ptr++;
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r += delta;
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blip_add_delta_fast(snd.blips[2][1], i, delta);
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/* left & right channels */
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l = ((ptr[0] * mul) / 1024);
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r = ((ptr[1] * mul) / 1024);
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blip_add_delta_fast(snd.blips[2], i, l-prev_l, r-prev_r);
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prev_l = l;
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prev_r = r;
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ptr+=2;
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/* update CD-DA fader volume (one step/sample) */
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if (curVol < endVol)
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@ -1153,27 +1148,19 @@ void cdd_read_audio(unsigned int samples)
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/* (MIN) 0,1,2,3,4,8,12,16,20...,1020,1024 (MAX) */
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mul = (curVol & 0x7fc) ? (curVol & 0x7fc) : (curVol & 0x03);
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/* left channel */
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/* left & right channels */
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#ifdef LSB_FIRST
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delta = ((ptr[0] * mul) / 1024) - l;
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ptr++;
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l = ((ptr[0] * mul) / 1024);
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r = ((ptr[1] * mul) / 1024);
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ptr+=2;
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#else
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delta = (((int16)((ptr[0] + ptr[1]*256)) * mul) / 1024) - l;
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ptr += 2;
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l = (((int16)((ptr[0] + ptr[1]*256)) * mul) / 1024);
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r = (((int16)((ptr[2] + ptr[3]*256)) * mul) / 1024);
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ptr+=4;
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#endif
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l += delta;
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blip_add_delta_fast(snd.blips[2][0], i, delta);
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/* right channel */
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#ifdef LSB_FIRST
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delta = ((ptr[0] * mul) / 1024) - r;
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ptr++;
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#else
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delta = (((int16)((ptr[0] + ptr[1]*256)) * mul) / 1024) - r;
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ptr += 2;
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#endif
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r += delta;
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blip_add_delta_fast(snd.blips[2][1], i, delta);
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blip_add_delta_fast(snd.blips[2], i, l-prev_l, r-prev_r);
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prev_l = l;
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prev_r = r;
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/* update CD-DA fader volume (one step/sample) */
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if (curVol < endVol)
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@ -1198,23 +1185,24 @@ void cdd_read_audio(unsigned int samples)
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cdd.volume = curVol;
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/* save last audio output for next frame */
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cdd.audio[0] = l;
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cdd.audio[1] = r;
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cdd.audio[0] = prev_l;
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cdd.audio[1] = prev_r;
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}
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else
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{
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/* no audio output */
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if (l) blip_add_delta_fast(snd.blips[2][0], 0, -l);
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if (r) blip_add_delta_fast(snd.blips[2][1], 0, -r);
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if (prev_l | prev_r)
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{
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blip_add_delta_fast(snd.blips[2], 0, -prev_l, -prev_r);
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/* save audio output for next frame */
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cdd.audio[0] = 0;
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cdd.audio[1] = 0;
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}
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}
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/* end of Blip Buffer timeframe */
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blip_end_frame(snd.blips[2][0], samples);
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blip_end_frame(snd.blips[2][1], samples);
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blip_end_frame(snd.blips[2], samples);
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}
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static void cdd_read_subcode(void)
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@ -2,7 +2,7 @@
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* Genesis Plus
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* PCM sound chip (315-5476A) (RF5C164 compatible)
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*
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* Copyright (C) 2012-2014 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2012-2016 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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@ -45,8 +45,7 @@ void pcm_init(double clock, int samplerate)
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{
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/* PCM chip is running at original rate and is synchronized with SUB-CPU */
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/* Chip output is resampled to desired rate using Blip Buffer. */
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blip_set_rates(snd.blips[1][0], clock / PCM_SCYCLES_RATIO, samplerate);
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blip_set_rates(snd.blips[1][1], clock / PCM_SCYCLES_RATIO, samplerate);
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blip_set_rates(snd.blips[1], clock / PCM_SCYCLES_RATIO, samplerate);
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}
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void pcm_reset(void)
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@ -71,8 +70,7 @@ void pcm_reset(void)
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pcm.cycles = 0;
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/* clear blip buffers */
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blip_clear(snd.blips[1][0]);
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blip_clear(snd.blips[1][1]);
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blip_clear(snd.blips[1]);
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}
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int pcm_context_save(uint8 *state)
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@ -117,6 +115,11 @@ void pcm_run(unsigned int length)
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#ifdef LOG_PCM
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error("[%d][%d]run %d PCM samples (from %d)\n", v_counter, s68k.cycles, length, pcm.cycles);
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#endif
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/* previous audio outputs */
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int prev_l = pcm.out[0];
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int prev_r = pcm.out[1];
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/* check if PCM chip is running */
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if (pcm.enabled)
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{
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@ -180,41 +183,29 @@ void pcm_run(unsigned int length)
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if (r < -32768) r = -32768;
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else if (r > 32767) r = 32767;
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/* check if PCM left output changed */
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if (pcm.out[0] != l)
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{
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blip_add_delta_fast(snd.blips[1][0], i, l-pcm.out[0]);
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pcm.out[0] = l;
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/* update Blip Buffer */
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blip_add_delta_fast(snd.blips[1], i, l-prev_l, r-prev_r);
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prev_l = l;
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prev_r = r;
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}
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/* check if PCM right output changed */
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if (pcm.out[1] != r)
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{
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blip_add_delta_fast(snd.blips[1][1], i, r-pcm.out[1]);
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pcm.out[1] = r;
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}
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}
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/* save last audio outputs */
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pcm.out[0] = prev_l;
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pcm.out[1] = prev_r;
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}
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else
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{
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/* check if PCM left output changed */
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if (pcm.out[0])
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/* check if PCM output was not muted */
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if (prev_l | prev_r)
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{
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blip_add_delta_fast(snd.blips[1][0], 0, -pcm.out[0]);
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blip_add_delta_fast(snd.blips[1], 0, -prev_l, -prev_r);
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pcm.out[0] = 0;
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}
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/* check if PCM right output changed */
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if (pcm.out[1])
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{
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blip_add_delta_fast(snd.blips[1][1], 0, -pcm.out[1]);
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pcm.out[1] = 0;
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}
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}
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/* end of blip buffer frame */
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blip_end_frame(snd.blips[1][0], length);
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blip_end_frame(snd.blips[1][1], length);
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blip_end_frame(snd.blips[1], length);
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/* update PCM master clock counter */
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pcm.cycles += length * PCM_SCYCLES_RATIO;
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@ -223,7 +214,7 @@ void pcm_run(unsigned int length)
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void pcm_update(unsigned int samples)
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{
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/* get number of internal clocks (samples) needed */
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unsigned int clocks = blip_clocks_needed(snd.blips[1][0], samples);
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unsigned int clocks = blip_clocks_needed(snd.blips[1], samples);
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/* run PCM chip */
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if (clocks > 0)
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@ -2,7 +2,7 @@
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* Genesis Plus
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* PCM sound chip (315-5476A) (RF5C164 compatible)
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*
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* Copyright (C) 2012-2014 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2012-2016 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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@ -1,10 +1,11 @@
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/* blip_buf $vers. http://www.slack.net/~ant/ */
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/* Modified for Genesis Plus GX by EkeEke (01/09/12) */
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/* Modified for Genesis Plus GX by EkeEke */
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/* - disabled assertions checks (define #BLIP_ASSERT to re-enable) */
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/* - fixed multiple time-frames support & removed m->avail */
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/* - modified blip_read_samples to always output to stereo streams */
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/* - added blip_mix_samples function (see blip_buf.h) */
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/* - added stereo buffer support (define #BLIP_MONO to disable) */
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/* - added inverted stereo output (define #BLIP_INVERT to enable)*/
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#include "blip_buf.h"
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@ -61,24 +62,32 @@ enum { phase_count = 1 << phase_bits };
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enum { delta_bits = 15 };
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enum { delta_unit = 1 << delta_bits };
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enum { frac_bits = time_bits - pre_shift };
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enum { phase_shift = frac_bits - phase_bits };
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/* We could eliminate avail and encode whole samples in offset, but that would
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limit the total buffered samples to blip_max_frame. That could only be
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increased by decreasing time_bits, which would reduce resample ratio accuracy.
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*/
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typedef int buf_t;
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struct blip_t
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{
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fixed_t factor;
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fixed_t offset;
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int size;
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#ifdef BLIP_MONO
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int integrator;
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#else
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int integrator[2];
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buf_t* buffer[2];
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#endif
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};
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typedef int buf_t;
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#ifdef BLIP_MONO
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/* probably not totally portable */
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#define SAMPLES( buf ) ((buf_t*) ((buf) + 1))
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#define SAMPLES( blip ) ((buf_t*) ((blip) + 1))
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#endif
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/* Arithmetic (sign-preserving) right shift */
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#define ARITH_SHIFT( n, shift ) \
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@ -124,9 +133,23 @@ blip_t* blip_new( int size )
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assert( size >= 0 );
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#endif
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#ifdef BLIP_MONO
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m = (blip_t*) malloc( sizeof *m + (size + buf_extra) * sizeof (buf_t) );
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#else
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m = (blip_t*) malloc( sizeof *m );
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#endif
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if ( m )
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{
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#ifndef BLIP_MONO
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m->buffer[0] = (buf_t*) malloc( (size + buf_extra) * sizeof (buf_t));
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m->buffer[1] = (buf_t*) malloc( (size + buf_extra) * sizeof (buf_t));
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if ((m->buffer[0] == NULL) || (m->buffer[1] == NULL))
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{
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blip_delete(m);
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return 0;
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}
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#endif
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m->factor = time_unit / blip_max_ratio;
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m->size = size;
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blip_clear( m );
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@ -141,6 +164,12 @@ void blip_delete( blip_t* m )
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{
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if ( m != NULL )
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{
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#ifndef BLIP_MONO
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if (m->buffer[0] != NULL)
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free(m->buffer[0]);
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if (m->buffer[1] != NULL)
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free(m->buffer[1]);
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#endif
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/* Clear fields in case user tries to use after freeing */
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memset( m, 0, sizeof *m );
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free( m );
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@ -175,8 +204,15 @@ void blip_clear( blip_t* m )
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a 64-bit factor this is years, the halving isn't a problem. */
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m->offset = m->factor / 2;
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#ifdef BLIP_MONO
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m->integrator = 0;
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memset( SAMPLES( m ), 0, (m->size + buf_extra) * sizeof (buf_t) );
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#else
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m->integrator[0] = 0;
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m->integrator[1] = 0;
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memset( m->buffer[0], 0, (m->size + buf_extra) * sizeof (buf_t) );
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memset( m->buffer[1], 0, (m->size + buf_extra) * sizeof (buf_t) );
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#endif
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}
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int blip_clocks_needed( const blip_t* m, int samples )
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@ -212,12 +248,21 @@ int blip_samples_avail( const blip_t* m )
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static void remove_samples( blip_t* m, int count )
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{
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#ifdef BLIP_MONO
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buf_t* buf = SAMPLES( m );
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#else
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buf_t* buf = m->buffer[0];
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#endif
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int remain = (m->offset >> time_bits) + buf_extra - count;
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m->offset -= count * time_unit;
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memmove( &buf [0], &buf [count], remain * sizeof buf [0] );
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memset( &buf [remain], 0, count * sizeof buf [0] );
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memmove( &buf [0], &buf [count], remain * sizeof (buf_t) );
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memset( &buf [remain], 0, count * sizeof (buf_t) );
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#ifndef BLIP_MONO
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buf = m->buffer[1];
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memmove( &buf [0], &buf [count], remain * sizeof (buf_t) );
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memset( &buf [remain], 0, count * sizeof (buf_t) );
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#endif
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}
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int blip_read_samples( blip_t* m, short out [], int count)
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@ -231,9 +276,16 @@ int blip_read_samples( blip_t* m, short out [], int count)
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if ( count )
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#endif
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{
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#ifdef BLIP_MONO
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buf_t const* in = SAMPLES( m );
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buf_t const* end = in + count;
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int sum = m->integrator;
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#else
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buf_t const* in = m->buffer[0];
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buf_t const* in2 = m->buffer[1];
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int sum = m->integrator[0];
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int sum2 = m->integrator[1];
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#endif
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buf_t const* end = in + count;
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do
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{
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/* Eliminate fraction */
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@ -243,57 +295,117 @@ int blip_read_samples( blip_t* m, short out [], int count)
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CLAMP( s );
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*out = s;
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out += 2;
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*out++ = s;
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/* High-pass filter */
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sum -= s << (delta_bits - bass_shift);
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#ifndef BLIP_MONO
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/* Eliminate fraction */
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s = ARITH_SHIFT( sum2, delta_bits );
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||||
|
||||
sum2 += *in2++;
|
||||
|
||||
CLAMP( s );
|
||||
|
||||
*out++ = s;
|
||||
|
||||
/* High-pass filter */
|
||||
sum2 -= s << (delta_bits - bass_shift);
|
||||
#endif
|
||||
}
|
||||
while ( in != end );
|
||||
m->integrator = sum;
|
||||
|
||||
#ifdef BLIP_MONO
|
||||
m->integrator = sum;
|
||||
#else
|
||||
m->integrator[0] = sum;
|
||||
m->integrator[1] = sum2;
|
||||
#endif
|
||||
remove_samples( m, count );
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
int blip_mix_samples( blip_t* m, short out [], int count)
|
||||
int blip_mix_samples( blip_t* m1, blip_t* m2, blip_t* m3, short out [], int count)
|
||||
{
|
||||
#ifdef BLIP_ASSERT
|
||||
assert( count >= 0 );
|
||||
|
||||
if ( count > (m->offset >> time_bits) )
|
||||
count = m->offset >> time_bits;
|
||||
if ( count > (m1->offset >> time_bits) )
|
||||
count = m1->offset >> time_bits;
|
||||
if ( count > (m2->offset >> time_bits) )
|
||||
count = m2->offset >> time_bits;
|
||||
if ( count > (m3->offset >> time_bits) )
|
||||
count = m3->offset >> time_bits;
|
||||
|
||||
if ( count )
|
||||
#endif
|
||||
{
|
||||
buf_t const* in = SAMPLES( m );
|
||||
buf_t const* end = in + count;
|
||||
int sum = m->integrator;
|
||||
buf_t const* end;
|
||||
buf_t const* in[3];
|
||||
#ifdef BLIP_MONO
|
||||
int sum = m1->integrator;
|
||||
in[0] = SAMPLES( m1 );
|
||||
in[1] = SAMPLES( m2 );
|
||||
in[2] = SAMPLES( m3 );
|
||||
#else
|
||||
int sum = m1->integrator[0];
|
||||
int sum2 = m1->integrator[1];
|
||||
buf_t const* in2[3];
|
||||
in[0] = m1->buffer[0];
|
||||
in[1] = m2->buffer[0];
|
||||
in[2] = m3->buffer[0];
|
||||
in2[0] = m1->buffer[1];
|
||||
in2[1] = m2->buffer[1];
|
||||
in2[2] = m3->buffer[1];
|
||||
#endif
|
||||
|
||||
end = in[0] + count;
|
||||
do
|
||||
{
|
||||
/* Eliminate fraction */
|
||||
int s = ARITH_SHIFT( sum, delta_bits );
|
||||
|
||||
sum += *in++;
|
||||
sum += *in[0]++;
|
||||
sum += *in[1]++;
|
||||
sum += *in[2]++;
|
||||
|
||||
CLAMP( s );
|
||||
|
||||
*out++ = s;
|
||||
|
||||
/* High-pass filter */
|
||||
sum -= s << (delta_bits - bass_shift);
|
||||
|
||||
/* Add current buffer value */
|
||||
s += *out;
|
||||
#ifndef BLIP_MONO
|
||||
/* Eliminate fraction */
|
||||
s = ARITH_SHIFT( sum2, delta_bits );
|
||||
|
||||
sum2 += *in2[0]++;
|
||||
sum2 += *in2[1]++;
|
||||
sum2 += *in2[2]++;
|
||||
|
||||
CLAMP( s );
|
||||
|
||||
*out = s;
|
||||
out += 2;
|
||||
}
|
||||
while ( in != end );
|
||||
m->integrator = sum;
|
||||
*out++ = s;
|
||||
|
||||
remove_samples( m, count );
|
||||
/* High-pass filter */
|
||||
sum2 -= s << (delta_bits - bass_shift);
|
||||
#endif
|
||||
}
|
||||
while ( in[0] != end );
|
||||
|
||||
#ifdef BLIP_MONO
|
||||
m1->integrator = sum;
|
||||
#else
|
||||
m1->integrator[0] = sum;
|
||||
m1->integrator[1] = sum2;
|
||||
#endif
|
||||
remove_samples( m1, count );
|
||||
remove_samples( m2, count );
|
||||
remove_samples( m3, count );
|
||||
}
|
||||
|
||||
return count;
|
||||
@ -348,12 +460,180 @@ possibly-wider fixed_t. On 32-bit platforms, this is likely more efficient.
|
||||
And by having pre_shift 32, a 32-bit platform can easily do the shift by
|
||||
simply ignoring the low half. */
|
||||
|
||||
#ifndef BLIP_MONO
|
||||
|
||||
void blip_add_delta( blip_t* m, unsigned time, int delta_l, int delta_r )
|
||||
{
|
||||
if (delta_l | delta_r)
|
||||
{
|
||||
unsigned fixed = (unsigned) ((time * m->factor + m->offset) >> pre_shift);
|
||||
int phase = fixed >> phase_shift & (phase_count - 1);
|
||||
short const* in = bl_step [phase];
|
||||
short const* rev = bl_step [phase_count - phase];
|
||||
int interp = fixed >> (phase_shift - delta_bits) & (delta_unit - 1);
|
||||
int pos = fixed >> frac_bits;
|
||||
|
||||
#ifdef BLIP_INVERT
|
||||
buf_t* out_l = m->buffer[1] + pos;
|
||||
buf_t* out_r = m->buffer[0] + pos;
|
||||
#else
|
||||
buf_t* out_l = m->buffer[0] + pos;
|
||||
buf_t* out_r = m->buffer[1] + pos;
|
||||
#endif
|
||||
|
||||
int delta;
|
||||
|
||||
#ifdef BLIP_ASSERT
|
||||
/* Fails if buffer size was exceeded */
|
||||
assert( pos <= m->size + end_frame_extra );
|
||||
#endif
|
||||
|
||||
if (delta_l == delta_r)
|
||||
{
|
||||
buf_t out;
|
||||
delta = (delta_l * interp) >> delta_bits;
|
||||
delta_l -= delta;
|
||||
out = in[0]*delta_l + in[half_width+0]*delta;
|
||||
out_l[0] += out;
|
||||
out_r[0] += out;
|
||||
out = in[1]*delta_l + in[half_width+1]*delta;
|
||||
out_l[1] += out;
|
||||
out_r[1] += out;
|
||||
out = in[2]*delta_l + in[half_width+2]*delta;
|
||||
out_l[2] += out;
|
||||
out_r[2] += out;
|
||||
out = in[3]*delta_l + in[half_width+3]*delta;
|
||||
out_l[3] += out;
|
||||
out_r[3] += out;
|
||||
out = in[4]*delta_l + in[half_width+4]*delta;
|
||||
out_l[4] += out;
|
||||
out_r[4] += out;
|
||||
out = in[5]*delta_l + in[half_width+5]*delta;
|
||||
out_l[5] += out;
|
||||
out_r[5] += out;
|
||||
out = in[6]*delta_l + in[half_width+6]*delta;
|
||||
out_l[6] += out;
|
||||
out_r[6] += out;
|
||||
out = in[7]*delta_l + in[half_width+7]*delta;
|
||||
out_l[7] += out;
|
||||
out_r[7] += out;
|
||||
out = rev[7]*delta_l + rev[7-half_width]*delta;
|
||||
out_l[8] += out;
|
||||
out_r[8] += out;
|
||||
out = rev[6]*delta_l + rev[6-half_width]*delta;
|
||||
out_l[9] += out;
|
||||
out_r[9] += out;
|
||||
out = rev[5]*delta_l + rev[5-half_width]*delta;
|
||||
out_l[10] += out;
|
||||
out_r[10] += out;
|
||||
out = rev[4]*delta_l + rev[4-half_width]*delta;
|
||||
out_l[11] += out;
|
||||
out_r[11] += out;
|
||||
out = rev[3]*delta_l + rev[3-half_width]*delta;
|
||||
out_l[12] += out;
|
||||
out_r[12] += out;
|
||||
out = rev[2]*delta_l + rev[2-half_width]*delta;
|
||||
out_l[13] += out;
|
||||
out_r[13] += out;
|
||||
out = rev[1]*delta_l + rev[1-half_width]*delta;
|
||||
out_l[14] += out;
|
||||
out_r[14] += out;
|
||||
out = rev[0]*delta_l + rev[0-half_width]*delta;
|
||||
out_l[15] += out;
|
||||
out_r[15] += out;
|
||||
}
|
||||
else
|
||||
{
|
||||
delta = (delta_l * interp) >> delta_bits;
|
||||
delta_l -= delta;
|
||||
out_l [0] += in[0]*delta_l + in[half_width+0]*delta;
|
||||
out_l [1] += in[1]*delta_l + in[half_width+1]*delta;
|
||||
out_l [2] += in[2]*delta_l + in[half_width+2]*delta;
|
||||
out_l [3] += in[3]*delta_l + in[half_width+3]*delta;
|
||||
out_l [4] += in[4]*delta_l + in[half_width+4]*delta;
|
||||
out_l [5] += in[5]*delta_l + in[half_width+5]*delta;
|
||||
out_l [6] += in[6]*delta_l + in[half_width+6]*delta;
|
||||
out_l [7] += in[7]*delta_l + in[half_width+7]*delta;
|
||||
out_l [8] += rev[7]*delta_l + rev[7-half_width]*delta;
|
||||
out_l [9] += rev[6]*delta_l + rev[6-half_width]*delta;
|
||||
out_l [10] += rev[5]*delta_l + rev[5-half_width]*delta;
|
||||
out_l [11] += rev[4]*delta_l + rev[4-half_width]*delta;
|
||||
out_l [12] += rev[3]*delta_l + rev[3-half_width]*delta;
|
||||
out_l [13] += rev[2]*delta_l + rev[2-half_width]*delta;
|
||||
out_l [14] += rev[1]*delta_l + rev[1-half_width]*delta;
|
||||
out_l [15] += rev[0]*delta_l + rev[0-half_width]*delta;
|
||||
|
||||
delta = (delta_r * interp) >> delta_bits;
|
||||
delta_r -= delta;
|
||||
out_r [0] += in[0]*delta_r + in[half_width+0]*delta;
|
||||
out_r [1] += in[1]*delta_r + in[half_width+1]*delta;
|
||||
out_r [2] += in[2]*delta_r + in[half_width+2]*delta;
|
||||
out_r [3] += in[3]*delta_r + in[half_width+3]*delta;
|
||||
out_r [4] += in[4]*delta_r + in[half_width+4]*delta;
|
||||
out_r [5] += in[5]*delta_r + in[half_width+5]*delta;
|
||||
out_r [6] += in[6]*delta_r + in[half_width+6]*delta;
|
||||
out_r [7] += in[7]*delta_r + in[half_width+7]*delta;
|
||||
out_r [8] += rev[7]*delta_r + rev[7-half_width]*delta;
|
||||
out_r [9] += rev[6]*delta_r + rev[6-half_width]*delta;
|
||||
out_r [10] += rev[5]*delta_r + rev[5-half_width]*delta;
|
||||
out_r [11] += rev[4]*delta_r + rev[4-half_width]*delta;
|
||||
out_r [12] += rev[3]*delta_r + rev[3-half_width]*delta;
|
||||
out_r [13] += rev[2]*delta_r + rev[2-half_width]*delta;
|
||||
out_r [14] += rev[1]*delta_r + rev[1-half_width]*delta;
|
||||
out_r [15] += rev[0]*delta_r + rev[0-half_width]*delta;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void blip_add_delta_fast( blip_t* m, unsigned time, int delta_l, int delta_r )
|
||||
{
|
||||
if (delta_l | delta_r)
|
||||
{
|
||||
unsigned fixed = (unsigned) ((time * m->factor + m->offset) >> pre_shift);
|
||||
int interp = fixed >> (frac_bits - delta_bits) & (delta_unit - 1);
|
||||
int pos = fixed >> frac_bits;
|
||||
|
||||
#ifdef STEREO_INVERT
|
||||
buf_t* out_l = m->buffer[1] + pos;
|
||||
buf_t* out_r = m->buffer[0] + pos;
|
||||
#else
|
||||
buf_t* out_l = m->buffer[0] + pos;
|
||||
buf_t* out_r = m->buffer[1] + pos;
|
||||
#endif
|
||||
|
||||
int delta = delta_l * interp;
|
||||
|
||||
#ifdef BLIP_ASSERT
|
||||
/* Fails if buffer size was exceeded */
|
||||
assert( pos <= m->size + end_frame_extra );
|
||||
#endif
|
||||
|
||||
if (delta_l == delta_r)
|
||||
{
|
||||
delta_l = delta_l * delta_unit - delta;
|
||||
out_l[7] += delta_l;
|
||||
out_l[8] += delta;
|
||||
out_r[7] += delta_l;
|
||||
out_r[8] += delta;
|
||||
}
|
||||
else
|
||||
{
|
||||
out_l[7] += delta_l * delta_unit - delta;
|
||||
out_l[8] += delta;
|
||||
delta = delta_r * interp;
|
||||
out_r[7] += delta_r * delta_unit - delta;
|
||||
out_r[8] += delta;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
void blip_add_delta( blip_t* m, unsigned time, int delta )
|
||||
{
|
||||
unsigned fixed = (unsigned) ((time * m->factor + m->offset) >> pre_shift);
|
||||
buf_t* out = SAMPLES( m ) + (fixed >> frac_bits);
|
||||
|
||||
int const phase_shift = frac_bits - phase_bits;
|
||||
int phase = fixed >> phase_shift & (phase_count - 1);
|
||||
short const* in = bl_step [phase];
|
||||
short const* rev = bl_step [phase_count - phase];
|
||||
@ -403,3 +683,4 @@ void blip_add_delta_fast( blip_t* m, unsigned time, int delta )
|
||||
out [7] += delta * delta_unit - delta2;
|
||||
out [8] += delta2;
|
||||
}
|
||||
#endif
|
||||
|
||||
@ -28,12 +28,24 @@ blip_max_ratio = 1 << 20 };
|
||||
/** Clears entire buffer. Afterwards, blip_samples_avail() == 0. */
|
||||
void blip_clear( blip_t* );
|
||||
|
||||
#ifndef BLIP_MONO
|
||||
|
||||
/** Adds positive/negative deltas into stereo buffers at specified clock time. */
|
||||
void blip_add_delta( blip_t*, unsigned time, int delta_l, int delta_r );
|
||||
|
||||
/** Same as blip_add_delta(), but uses faster, lower-quality synthesis. */
|
||||
void blip_add_delta_fast( blip_t*, unsigned int clock_time, int delta_l, int delta_r );
|
||||
|
||||
#else
|
||||
|
||||
/** Adds positive/negative delta into buffer at specified clock time. */
|
||||
void blip_add_delta( blip_t*, unsigned int clock_time, int delta );
|
||||
|
||||
/** Same as blip_add_delta(), but uses faster, lower-quality synthesis. */
|
||||
void blip_add_delta_fast( blip_t*, unsigned int clock_time, int delta );
|
||||
|
||||
#endif
|
||||
|
||||
/** Length of time frame, in clocks, needed to make sample_count additional
|
||||
samples available. */
|
||||
int blip_clocks_needed( const blip_t*, int sample_count );
|
||||
@ -56,9 +68,8 @@ element of 'out', allowing easy interleaving of two buffers into a stereo sample
|
||||
stream. Outputs 16-bit signed samples. Returns number of samples actually read. */
|
||||
int blip_read_samples( blip_t*, short out [], int count);
|
||||
|
||||
/* Same as above function except sample is added to output buffer previous value */
|
||||
/* This allows easy mixing of different blip buffers into a single output stream */
|
||||
int blip_mix_samples( blip_t* m, short out [], int count);
|
||||
/* Same as above function except sample is mixed from three blip buffers source */
|
||||
int blip_mix_samples( blip_t* m1, blip_t* m2, blip_t* m3, short out [], int count);
|
||||
|
||||
/** Frees buffer. No effect if NULL is passed. */
|
||||
void blip_delete( blip_t* );
|
||||
|
||||
@ -167,45 +167,23 @@ int SN76489_GetContextSize(void)
|
||||
/* Updates tone amplitude in delta buffer. Call whenever amplitude might have changed. */
|
||||
INLINE void UpdateToneAmplitude(int i, int time)
|
||||
{
|
||||
int delta;
|
||||
|
||||
/* left output */
|
||||
delta = (SN76489.Channel[i][0] * SN76489.ToneFreqPos[i]) - SN76489.ChanOut[i][0];
|
||||
if (delta != 0)
|
||||
{
|
||||
SN76489.ChanOut[i][0] += delta;
|
||||
blip_add_delta(snd.blips[0][0], time, delta);
|
||||
}
|
||||
|
||||
/* right output */
|
||||
delta = (SN76489.Channel[i][1] * SN76489.ToneFreqPos[i]) - SN76489.ChanOut[i][1];
|
||||
if (delta != 0)
|
||||
{
|
||||
SN76489.ChanOut[i][1] += delta;
|
||||
blip_add_delta(snd.blips[0][1], time, delta);
|
||||
}
|
||||
/* left & right output */
|
||||
int delta_l = (SN76489.Channel[i][0] * SN76489.ToneFreqPos[i]) - SN76489.ChanOut[i][0];
|
||||
int delta_r = (SN76489.Channel[i][1] * SN76489.ToneFreqPos[i]) - SN76489.ChanOut[i][1];
|
||||
blip_add_delta(snd.blips[0], time, delta_l, delta_r);
|
||||
SN76489.ChanOut[i][0] += delta_l;
|
||||
SN76489.ChanOut[i][1] += delta_r;
|
||||
}
|
||||
|
||||
/* Updates noise amplitude in delta buffer. Call whenever amplitude might have changed. */
|
||||
INLINE void UpdateNoiseAmplitude(int time)
|
||||
{
|
||||
int delta;
|
||||
|
||||
/* left output */
|
||||
delta = (SN76489.Channel[3][0] * ( SN76489.NoiseShiftRegister & 0x1 )) - SN76489.ChanOut[3][0];
|
||||
if (delta != 0)
|
||||
{
|
||||
SN76489.ChanOut[3][0] += delta;
|
||||
blip_add_delta(snd.blips[0][0], time, delta);
|
||||
}
|
||||
|
||||
/* right output */
|
||||
delta = (SN76489.Channel[3][1] * ( SN76489.NoiseShiftRegister & 0x1 )) - SN76489.ChanOut[3][1];
|
||||
if (delta != 0)
|
||||
{
|
||||
SN76489.ChanOut[3][1] += delta;
|
||||
blip_add_delta(snd.blips[0][1], time, delta);
|
||||
}
|
||||
/* left & right output */
|
||||
int delta_l = (SN76489.Channel[3][0] * ( SN76489.NoiseShiftRegister & 0x1 )) - SN76489.ChanOut[3][0];
|
||||
int delta_r = (SN76489.Channel[3][1] * ( SN76489.NoiseShiftRegister & 0x1 )) - SN76489.ChanOut[3][1];
|
||||
blip_add_delta(snd.blips[0], time, delta_l, delta_r);
|
||||
SN76489.ChanOut[3][0] += delta_l;
|
||||
SN76489.ChanOut[3][1] += delta_r;
|
||||
}
|
||||
|
||||
/* Runs tone channel for clock_length clocks */
|
||||
|
||||
@ -2,8 +2,8 @@
|
||||
* Genesis Plus
|
||||
* Sound Hardware
|
||||
*
|
||||
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
|
||||
* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
|
||||
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
|
||||
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
|
||||
*
|
||||
* Redistribution and use of this code or any derivative works are permitted
|
||||
* provided that the following conditions are met:
|
||||
@ -125,7 +125,7 @@ void sound_reset(void)
|
||||
|
||||
int sound_update(unsigned int cycles)
|
||||
{
|
||||
int delta, preamp, time, l, r, *ptr;
|
||||
int prev_l, prev_r, preamp, time, l, r, *ptr;
|
||||
|
||||
/* Run PSG & FM chips until end of frame */
|
||||
SN76489_Update(cycles);
|
||||
@ -138,8 +138,8 @@ int sound_update(unsigned int cycles)
|
||||
time = fm_cycles_start;
|
||||
|
||||
/* Restore last FM outputs from previous frame */
|
||||
l = fm_last[0];
|
||||
r = fm_last[1];
|
||||
prev_l = fm_last[0];
|
||||
prev_r = fm_last[1];
|
||||
|
||||
/* FM buffer start pointer */
|
||||
ptr = fm_buffer;
|
||||
@ -150,15 +150,12 @@ int sound_update(unsigned int cycles)
|
||||
/* high-quality Band-Limited synthesis */
|
||||
do
|
||||
{
|
||||
/* left channel */
|
||||
delta = ((*ptr++ * preamp) / 100) - l;
|
||||
l += delta;
|
||||
blip_add_delta(snd.blips[0][0], time, delta);
|
||||
|
||||
/* right channel */
|
||||
delta = ((*ptr++ * preamp) / 100) - r;
|
||||
r += delta;
|
||||
blip_add_delta(snd.blips[0][1], time, delta);
|
||||
/* left & right channels */
|
||||
l = ((*ptr++ * preamp) / 100);
|
||||
r = ((*ptr++ * preamp) / 100);
|
||||
blip_add_delta(snd.blips[0], time, l-prev_l, r-prev_r);
|
||||
prev_l = l;
|
||||
prev_r = r;
|
||||
|
||||
/* increment time counter */
|
||||
time += fm_cycles_ratio;
|
||||
@ -170,15 +167,12 @@ int sound_update(unsigned int cycles)
|
||||
/* faster Linear Interpolation */
|
||||
do
|
||||
{
|
||||
/* left channel */
|
||||
delta = ((*ptr++ * preamp) / 100) - l;
|
||||
l += delta;
|
||||
blip_add_delta_fast(snd.blips[0][0], time, delta);
|
||||
|
||||
/* right channel */
|
||||
delta = ((*ptr++ * preamp) / 100) - r;
|
||||
r += delta;
|
||||
blip_add_delta_fast(snd.blips[0][1], time, delta);
|
||||
/* left & right channels */
|
||||
l = ((*ptr++ * preamp) / 100);
|
||||
r = ((*ptr++ * preamp) / 100);
|
||||
blip_add_delta_fast(snd.blips[0], time, l-prev_l, r-prev_r);
|
||||
prev_l = l;
|
||||
prev_r = r;
|
||||
|
||||
/* increment time counter */
|
||||
time += fm_cycles_ratio;
|
||||
@ -190,18 +184,17 @@ int sound_update(unsigned int cycles)
|
||||
fm_ptr = fm_buffer;
|
||||
|
||||
/* save last FM output for next frame */
|
||||
fm_last[0] = l;
|
||||
fm_last[1] = r;
|
||||
fm_last[0] = prev_l;
|
||||
fm_last[1] = prev_r;
|
||||
|
||||
/* adjust FM cycle counters for next frame */
|
||||
fm_cycles_count = fm_cycles_start = time - cycles;
|
||||
|
||||
/* end of blip buffers time frame */
|
||||
blip_end_frame(snd.blips[0][0], cycles);
|
||||
blip_end_frame(snd.blips[0][1], cycles);
|
||||
/* end of blip buffer time frame */
|
||||
blip_end_frame(snd.blips[0], cycles);
|
||||
|
||||
/* return number of available samples */
|
||||
return blip_samples_avail(snd.blips[0][0]);
|
||||
return blip_samples_avail(snd.blips[0]);
|
||||
}
|
||||
|
||||
int sound_context_save(uint8 *state)
|
||||
|
||||
@ -2,8 +2,8 @@
|
||||
* Genesis Plus
|
||||
* Sound Hardware
|
||||
*
|
||||
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
|
||||
* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
|
||||
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
|
||||
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
|
||||
*
|
||||
* Redistribution and use of this code or any derivative works are permitted
|
||||
* provided that the following conditions are met:
|
||||
|
||||
@ -68,11 +68,9 @@ int audio_init(int samplerate, double framerate)
|
||||
memset(&snd, 0, sizeof (snd));
|
||||
|
||||
/* Initialize Blip Buffers */
|
||||
snd.blips[0][0] = blip_new(samplerate / 10);
|
||||
snd.blips[0][1] = blip_new(samplerate / 10);
|
||||
if (!snd.blips[0][0] || !snd.blips[0][1])
|
||||
snd.blips[0] = blip_new(samplerate / 10);
|
||||
if (!snd.blips[0])
|
||||
{
|
||||
audio_shutdown();
|
||||
return -1;
|
||||
}
|
||||
|
||||
@ -80,11 +78,9 @@ int audio_init(int samplerate, double framerate)
|
||||
if (system_hw == SYSTEM_MCD)
|
||||
{
|
||||
/* allocate blip buffers */
|
||||
snd.blips[1][0] = blip_new(samplerate / 10);
|
||||
snd.blips[1][1] = blip_new(samplerate / 10);
|
||||
snd.blips[2][0] = blip_new(samplerate / 10);
|
||||
snd.blips[2][1] = blip_new(samplerate / 10);
|
||||
if (!snd.blips[1][0] || !snd.blips[1][1] || !snd.blips[2][0] || !snd.blips[2][1])
|
||||
snd.blips[1] = blip_new(samplerate / 10);
|
||||
snd.blips[2] = blip_new(samplerate / 10);
|
||||
if (!snd.blips[1] || !snd.blips[2])
|
||||
{
|
||||
audio_shutdown();
|
||||
return -1;
|
||||
@ -132,8 +128,7 @@ void audio_set_rate(int samplerate, double framerate)
|
||||
/* master clock timebase so they remain perfectly synchronized together, while still */
|
||||
/* being synchronized with 68K and Z80 CPUs as well. Mixed sound chip output is then */
|
||||
/* resampled to desired rate at the end of each frame, using Blip Buffer. */
|
||||
blip_set_rates(snd.blips[0][0], mclk, samplerate);
|
||||
blip_set_rates(snd.blips[0][1], mclk, samplerate);
|
||||
blip_set_rates(snd.blips[0], mclk, samplerate);
|
||||
|
||||
/* Mega CD sound hardware */
|
||||
if (system_hw == SYSTEM_MCD)
|
||||
@ -155,17 +150,14 @@ void audio_set_rate(int samplerate, double framerate)
|
||||
|
||||
void audio_reset(void)
|
||||
{
|
||||
int i,j;
|
||||
int i;
|
||||
|
||||
/* Clear blip buffers */
|
||||
for (i=0; i<3; i++)
|
||||
{
|
||||
for (j=0; j<2; j++)
|
||||
if (snd.blips[i])
|
||||
{
|
||||
if (snd.blips[i][j])
|
||||
{
|
||||
blip_clear(snd.blips[i][j]);
|
||||
}
|
||||
blip_clear(snd.blips[i]);
|
||||
}
|
||||
}
|
||||
|
||||
@ -187,16 +179,13 @@ void audio_set_equalizer(void)
|
||||
|
||||
void audio_shutdown(void)
|
||||
{
|
||||
int i,j;
|
||||
int i;
|
||||
|
||||
/* Delete blip buffers */
|
||||
for (i=0; i<3; i++)
|
||||
{
|
||||
for (j=0; j<2; j++)
|
||||
{
|
||||
blip_delete(snd.blips[i][j]);
|
||||
snd.blips[i][j] = 0;
|
||||
}
|
||||
blip_delete(snd.blips[i]);
|
||||
snd.blips[i] = 0;
|
||||
}
|
||||
}
|
||||
|
||||
@ -213,37 +202,24 @@ int audio_update(int16 *buffer)
|
||||
|
||||
/* read CDDA samples */
|
||||
cdd_read_audio(size);
|
||||
}
|
||||
|
||||
#ifdef ALIGN_SND
|
||||
/* return an aligned number of samples if required */
|
||||
size &= ALIGN_SND;
|
||||
#endif
|
||||
|
||||
/* resample FM & PSG mixed stream to output buffer */
|
||||
#ifdef LSB_FIRST
|
||||
blip_read_samples(snd.blips[0][0], buffer, size);
|
||||
blip_read_samples(snd.blips[0][1], buffer + 1, size);
|
||||
#else
|
||||
blip_read_samples(snd.blips[0][0], buffer + 1, size);
|
||||
blip_read_samples(snd.blips[0][1], buffer, size);
|
||||
/* resample & mix FM/PSG, PCM & CD-DA streams to output buffer */
|
||||
blip_mix_samples(snd.blips[0], snd.blips[1], snd.blips[2], buffer, size);
|
||||
}
|
||||
else
|
||||
{
|
||||
#ifdef ALIGN_SND
|
||||
/* return an aligned number of samples if required */
|
||||
size &= ALIGN_SND;
|
||||
#endif
|
||||
|
||||
/* Mega CD specific */
|
||||
if (system_hw == SYSTEM_MCD)
|
||||
{
|
||||
/* resample PCM & CD-DA streams to output buffer */
|
||||
#ifdef LSB_FIRST
|
||||
blip_mix_samples(snd.blips[1][0], buffer, size);
|
||||
blip_mix_samples(snd.blips[1][1], buffer + 1, size);
|
||||
blip_mix_samples(snd.blips[2][0], buffer, size);
|
||||
blip_mix_samples(snd.blips[2][1], buffer + 1, size);
|
||||
#else
|
||||
blip_mix_samples(snd.blips[1][0], buffer + 1, size);
|
||||
blip_mix_samples(snd.blips[1][1], buffer, size);
|
||||
blip_mix_samples(snd.blips[2][0], buffer + 1, size);
|
||||
blip_mix_samples(snd.blips[2][1], buffer, size);
|
||||
#endif
|
||||
/* resample FM/PSG mixed stream to output buffer */
|
||||
blip_read_samples(snd.blips[0], buffer, size);
|
||||
}
|
||||
|
||||
/* Audio filtering */
|
||||
|
||||
@ -91,7 +91,7 @@ typedef struct
|
||||
int sample_rate; /* Output Sample rate (8000-48000) */
|
||||
double frame_rate; /* Output Frame rate (usually 50 or 60 frames per second) */
|
||||
int enabled; /* 1= sound emulation is enabled */
|
||||
blip_t* blips[3][2]; /* Blip Buffer resampling */
|
||||
blip_t* blips[3]; /* Blip Buffer resampling (stereo) */
|
||||
} t_snd;
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user