mirror of
https://github.com/holub/mame
synced 2025-05-30 17:41:47 +03:00
673 lines
17 KiB
C
673 lines
17 KiB
C
/**********************************************************************************************
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*
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* streaming ADPCM driver
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* by Aaron Giles
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*
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* Library to transcode from an ADPCM source to raw PCM.
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* Written by Buffoni Mirko in 08/06/97
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* References: various sources and documents.
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*
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* HJB 08/31/98
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* modified to use an automatically selected oversampling factor
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* for the current sample rate
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*
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* Mish 21/7/99
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* Updated to allow multiple OKI chips with different sample rates
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*
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* R. Belmont 31/10/2003
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* Updated to allow a driver to use both MSM6295s and "raw" ADPCM voices (gcpinbal)
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* Also added some error trapping for MAME_DEBUG builds
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*
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**********************************************************************************************/
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#include <math.h>
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#include "sndintrf.h"
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#include "deprecat.h"
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#include "streams.h"
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#include "okim6295.h"
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#define MAX_SAMPLE_CHUNK 10000
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/* struct describing a single playing ADPCM voice */
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struct ADPCMVoice
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{
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UINT8 playing; /* 1 if we are actively playing */
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UINT32 base_offset; /* pointer to the base memory location */
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UINT32 sample; /* current sample number */
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UINT32 count; /* total samples to play */
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struct adpcm_state adpcm;/* current ADPCM state */
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UINT32 volume; /* output volume */
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};
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struct okim6295
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{
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#define OKIM6295_VOICES 4
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struct ADPCMVoice voice[OKIM6295_VOICES];
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INT32 command;
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INT32 bank_offset;
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UINT8 *region_base; /* pointer to the base of the region */
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sound_stream *stream; /* which stream are we playing on? */
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UINT32 master_clock; /* master clock frequency */
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};
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/* step size index shift table */
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static const int index_shift[8] = { -1, -1, -1, -1, 2, 4, 6, 8 };
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/* lookup table for the precomputed difference */
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static int diff_lookup[49*16];
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/* volume lookup table */
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static UINT32 volume_table[16];
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/* tables computed? */
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static int tables_computed = 0;
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/* useful interfaces */
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const struct OKIM6295interface okim6295_interface_pin7high = { 1 };
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const struct OKIM6295interface okim6295_interface_pin7low = { 0 };
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/**********************************************************************************************
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compute_tables -- compute the difference tables
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***********************************************************************************************/
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static void compute_tables(void)
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{
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/* nibble to bit map */
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static const int nbl2bit[16][4] =
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{
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{ 1, 0, 0, 0}, { 1, 0, 0, 1}, { 1, 0, 1, 0}, { 1, 0, 1, 1},
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{ 1, 1, 0, 0}, { 1, 1, 0, 1}, { 1, 1, 1, 0}, { 1, 1, 1, 1},
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{-1, 0, 0, 0}, {-1, 0, 0, 1}, {-1, 0, 1, 0}, {-1, 0, 1, 1},
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{-1, 1, 0, 0}, {-1, 1, 0, 1}, {-1, 1, 1, 0}, {-1, 1, 1, 1}
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};
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int step, nib;
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/* loop over all possible steps */
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for (step = 0; step <= 48; step++)
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{
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/* compute the step value */
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int stepval = floor(16.0 * pow(11.0 / 10.0, (double)step));
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/* loop over all nibbles and compute the difference */
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for (nib = 0; nib < 16; nib++)
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{
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diff_lookup[step*16 + nib] = nbl2bit[nib][0] *
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(stepval * nbl2bit[nib][1] +
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stepval/2 * nbl2bit[nib][2] +
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stepval/4 * nbl2bit[nib][3] +
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stepval/8);
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}
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}
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/* generate the OKI6295 volume table */
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for (step = 0; step < 16; step++)
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{
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double out = 256.0;
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int vol = step;
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/* 3dB per step */
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while (vol-- > 0)
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out /= 1.412537545; /* = 10 ^ (3/20) = 3dB */
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volume_table[step] = (UINT32)out;
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}
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tables_computed = 1;
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}
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/**********************************************************************************************
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reset_adpcm -- reset the ADPCM stream
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***********************************************************************************************/
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void reset_adpcm(struct adpcm_state *state)
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{
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/* make sure we have our tables */
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if (!tables_computed)
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compute_tables();
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/* reset the signal/step */
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state->signal = -2;
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state->step = 0;
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}
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/**********************************************************************************************
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clock_adpcm -- clock the next ADPCM byte
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***********************************************************************************************/
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INT16 clock_adpcm(struct adpcm_state *state, UINT8 nibble)
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{
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state->signal += diff_lookup[state->step * 16 + (nibble & 15)];
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/* clamp to the maximum */
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if (state->signal > 2047)
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state->signal = 2047;
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else if (state->signal < -2048)
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state->signal = -2048;
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/* adjust the step size and clamp */
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state->step += index_shift[nibble & 7];
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if (state->step > 48)
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state->step = 48;
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else if (state->step < 0)
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state->step = 0;
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/* return the signal scaled up to 32767 */
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return state->signal << 4;
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}
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/**********************************************************************************************
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generate_adpcm -- general ADPCM decoding routine
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***********************************************************************************************/
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static void generate_adpcm(struct okim6295 *chip, struct ADPCMVoice *voice, INT16 *buffer, int samples)
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{
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/* if this voice is active */
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if (voice->playing)
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{
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UINT8 *base = chip->region_base + chip->bank_offset + voice->base_offset;
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int sample = voice->sample;
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int count = voice->count;
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/* loop while we still have samples to generate */
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while (samples)
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{
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/* compute the new amplitude and update the current step */
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int nibble = base[sample / 2] >> (((sample & 1) << 2) ^ 4);
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/* output to the buffer, scaling by the volume */
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*buffer++ = clock_adpcm(&voice->adpcm, nibble) * voice->volume / 256;
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samples--;
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/* next! */
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if (++sample >= count)
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{
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voice->playing = 0;
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break;
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}
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}
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/* update the parameters */
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voice->sample = sample;
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}
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/* fill the rest with silence */
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while (samples--)
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*buffer++ = 0;
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}
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/**********************************************************************************************
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*
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* OKIM 6295 ADPCM chip:
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*
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* Command bytes are sent:
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*
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* 1xxx xxxx = start of 2-byte command sequence, xxxxxxx is the sample number to trigger
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* abcd vvvv = second half of command; one of the abcd bits is set to indicate which voice
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* the v bits seem to be volumed
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*
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* 0abc d000 = stop playing; one or more of the abcd bits is set to indicate which voice(s)
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*
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* Status is read:
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*
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* ???? abcd = one bit per voice, set to 0 if nothing is playing, or 1 if it is active
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*
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***********************************************************************************************/
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/**********************************************************************************************
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okim6295_update -- update the sound chip so that it is in sync with CPU execution
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***********************************************************************************************/
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static void okim6295_update(void *param, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
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{
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struct okim6295 *chip = param;
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int i;
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memset(outputs[0], 0, samples * sizeof(*outputs[0]));
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for (i = 0; i < OKIM6295_VOICES; i++)
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{
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struct ADPCMVoice *voice = &chip->voice[i];
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stream_sample_t *buffer = outputs[0];
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INT16 sample_data[MAX_SAMPLE_CHUNK];
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int remaining = samples;
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/* loop while we have samples remaining */
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while (remaining)
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{
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int samples = (remaining > MAX_SAMPLE_CHUNK) ? MAX_SAMPLE_CHUNK : remaining;
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int samp;
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generate_adpcm(chip, voice, sample_data, samples);
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for (samp = 0; samp < samples; samp++)
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*buffer++ += sample_data[samp];
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remaining -= samples;
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}
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}
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}
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/**********************************************************************************************
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state save support for MAME
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***********************************************************************************************/
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static void adpcm_state_save_register(struct ADPCMVoice *voice, int i)
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{
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char buf[20];
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sprintf(buf,"ADPCM");
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state_save_register_item(buf, i, voice->playing);
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state_save_register_item(buf, i, voice->sample);
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state_save_register_item(buf, i, voice->count);
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state_save_register_item(buf, i, voice->adpcm.signal);
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state_save_register_item(buf, i, voice->adpcm.step);
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state_save_register_item(buf, i, voice->volume);
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state_save_register_item(buf, i, voice->base_offset);
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}
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static void okim6295_state_save_register(struct okim6295 *info, int sndindex)
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{
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int j;
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char buf[20];
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sprintf(buf,"OKIM6295");
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state_save_register_item(buf, sndindex, info->command);
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state_save_register_item(buf, sndindex, info->bank_offset);
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for (j = 0; j < OKIM6295_VOICES; j++)
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adpcm_state_save_register(&info->voice[j], sndindex * 4 + j);
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}
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/**********************************************************************************************
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OKIM6295_start -- start emulation of an OKIM6295-compatible chip
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***********************************************************************************************/
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static void *okim6295_start(const char *tag, int sndindex, int clock, const void *config)
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{
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const struct OKIM6295interface *intf = config;
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struct okim6295 *info;
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int voice;
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int divisor = intf->pin7 ? 132 : 165;
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info = auto_malloc(sizeof(*info));
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memset(info, 0, sizeof(*info));
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compute_tables();
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info->command = -1;
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info->bank_offset = 0;
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info->region_base = memory_region(Machine, (intf->rgnoverride != NULL) ? intf->rgnoverride : tag);
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info->master_clock = clock;
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/* generate the name and create the stream */
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info->stream = stream_create(0, 1, clock/divisor, info, okim6295_update);
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/* initialize the voices */
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for (voice = 0; voice < OKIM6295_VOICES; voice++)
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{
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/* initialize the rest of the structure */
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info->voice[voice].volume = 255;
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reset_adpcm(&info->voice[voice].adpcm);
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}
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okim6295_state_save_register(info, sndindex);
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/* success */
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return info;
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}
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/**********************************************************************************************
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OKIM6295_stop -- stop emulation of an OKIM6295-compatible chip
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***********************************************************************************************/
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static void okim6295_reset(void *chip)
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{
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struct okim6295 *info = chip;
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int i;
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stream_update(info->stream);
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for (i = 0; i < OKIM6295_VOICES; i++)
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info->voice[i].playing = 0;
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}
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/**********************************************************************************************
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OKIM6295_set_bank_base -- set the base of the bank for a given voice on a given chip
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***********************************************************************************************/
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void OKIM6295_set_bank_base(int which, int base)
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{
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struct okim6295 *info = sndti_token(SOUND_OKIM6295, which);
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stream_update(info->stream);
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info->bank_offset = base;
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}
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/**********************************************************************************************
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OKIM6295_set_pin7 -- adjust pin 7, which controls the internal clock division
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***********************************************************************************************/
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void OKIM6295_set_pin7(int which, int pin7)
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{
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struct okim6295 *info = sndti_token(SOUND_OKIM6295, which);
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int divisor = pin7 ? 132 : 165;
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stream_set_sample_rate(info->stream, info->master_clock/divisor);
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}
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/**********************************************************************************************
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OKIM6295_status_r -- read the status port of an OKIM6295-compatible chip
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***********************************************************************************************/
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static int OKIM6295_status_r(int num)
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{
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struct okim6295 *info = sndti_token(SOUND_OKIM6295, num);
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int i, result;
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result = 0xf0; /* naname expects bits 4-7 to be 1 */
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/* set the bit to 1 if something is playing on a given channel */
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stream_update(info->stream);
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for (i = 0; i < OKIM6295_VOICES; i++)
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{
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struct ADPCMVoice *voice = &info->voice[i];
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/* set the bit if it's playing */
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if (voice->playing)
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result |= 1 << i;
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}
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return result;
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}
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/**********************************************************************************************
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OKIM6295_data_w -- write to the data port of an OKIM6295-compatible chip
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***********************************************************************************************/
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static void OKIM6295_data_w(int num, int data)
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{
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struct okim6295 *info = sndti_token(SOUND_OKIM6295, num);
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/* if a command is pending, process the second half */
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if (info->command != -1)
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{
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int temp = data >> 4, i, start, stop;
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unsigned char *base;
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/* update the stream */
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stream_update(info->stream);
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/* determine which voice(s) (voice is set by a 1 bit in the upper 4 bits of the second byte) */
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for (i = 0; i < OKIM6295_VOICES; i++, temp >>= 1)
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{
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if (temp & 1)
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{
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struct ADPCMVoice *voice = &info->voice[i];
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/* determine the start/stop positions */
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base = &info->region_base[info->bank_offset + info->command * 8];
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start = ((base[0] << 16) + (base[1] << 8) + base[2]) & 0x3ffff;
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stop = ((base[3] << 16) + (base[4] << 8) + base[5]) & 0x3ffff;
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/* set up the voice to play this sample */
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if (start < stop)
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{
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if (!voice->playing) /* fixes Got-cha and Steel Force */
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{
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voice->playing = 1;
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voice->base_offset = start;
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voice->sample = 0;
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voice->count = 2 * (stop - start + 1);
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/* also reset the ADPCM parameters */
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reset_adpcm(&voice->adpcm);
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voice->volume = volume_table[data & 0x0f];
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}
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else
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{
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logerror("OKIM6295:%d requested to play sample %02x on non-stopped voice\n",num,info->command);
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}
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}
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/* invalid samples go here */
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else
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{
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logerror("OKIM6295:%d requested to play invalid sample %02x\n",num,info->command);
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voice->playing = 0;
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}
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}
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}
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/* reset the command */
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info->command = -1;
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}
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/* if this is the start of a command, remember the sample number for next time */
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else if (data & 0x80)
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{
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info->command = data & 0x7f;
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}
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/* otherwise, see if this is a silence command */
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else
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{
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int temp = data >> 3, i;
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/* update the stream, then turn it off */
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stream_update(info->stream);
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/* determine which voice(s) (voice is set by a 1 bit in bits 3-6 of the command */
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for (i = 0; i < 4; i++, temp >>= 1)
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{
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if (temp & 1)
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{
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struct ADPCMVoice *voice = &info->voice[i];
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voice->playing = 0;
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}
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}
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}
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}
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/**********************************************************************************************
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OKIM6295_status_0_r -- generic status read functions
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OKIM6295_status_1_r
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***********************************************************************************************/
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READ8_HANDLER( OKIM6295_status_0_r )
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{
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return OKIM6295_status_r(0);
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}
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READ8_HANDLER( OKIM6295_status_1_r )
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{
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return OKIM6295_status_r(1);
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}
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READ8_HANDLER( OKIM6295_status_2_r )
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{
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return OKIM6295_status_r(2);
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}
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READ16_HANDLER( OKIM6295_status_0_lsb_r )
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{
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return OKIM6295_status_r(0);
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}
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READ16_HANDLER( OKIM6295_status_1_lsb_r )
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{
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return OKIM6295_status_r(1);
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}
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READ16_HANDLER( OKIM6295_status_2_lsb_r )
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{
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return OKIM6295_status_r(2);
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}
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READ16_HANDLER( OKIM6295_status_0_msb_r )
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{
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return OKIM6295_status_r(0) << 8;
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}
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READ16_HANDLER( OKIM6295_status_1_msb_r )
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{
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return OKIM6295_status_r(1) << 8;
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}
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READ16_HANDLER( OKIM6295_status_2_msb_r )
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{
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return OKIM6295_status_r(2) << 8;
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}
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/**********************************************************************************************
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OKIM6295_data_0_w -- generic data write functions
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OKIM6295_data_1_w
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***********************************************************************************************/
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WRITE8_HANDLER( OKIM6295_data_0_w )
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{
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OKIM6295_data_w(0, data);
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}
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WRITE8_HANDLER( OKIM6295_data_1_w )
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{
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OKIM6295_data_w(1, data);
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}
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WRITE8_HANDLER( OKIM6295_data_2_w )
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{
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OKIM6295_data_w(2, data);
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}
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WRITE16_HANDLER( OKIM6295_data_0_lsb_w )
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{
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if (ACCESSING_BITS_0_7)
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OKIM6295_data_w(0, data & 0xff);
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}
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WRITE16_HANDLER( OKIM6295_data_1_lsb_w )
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{
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if (ACCESSING_BITS_0_7)
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OKIM6295_data_w(1, data & 0xff);
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}
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WRITE16_HANDLER( OKIM6295_data_2_lsb_w )
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{
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if (ACCESSING_BITS_0_7)
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OKIM6295_data_w(2, data & 0xff);
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}
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WRITE16_HANDLER( OKIM6295_data_0_msb_w )
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{
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if (ACCESSING_BITS_8_15)
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OKIM6295_data_w(0, data >> 8);
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}
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WRITE16_HANDLER( OKIM6295_data_1_msb_w )
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{
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if (ACCESSING_BITS_8_15)
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OKIM6295_data_w(1, data >> 8);
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}
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WRITE16_HANDLER( OKIM6295_data_2_msb_w )
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{
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if (ACCESSING_BITS_8_15)
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OKIM6295_data_w(2, data >> 8);
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}
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/**************************************************************************
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* Generic get_info
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**************************************************************************/
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static void okim6295_set_info(void *token, UINT32 state, sndinfo *info)
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{
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switch (state)
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{
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/* no parameters to set */
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}
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}
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void okim6295_get_info(void *token, UINT32 state, sndinfo *info)
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{
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switch (state)
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{
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/* --- the following bits of info are returned as 64-bit signed integers --- */
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/* --- the following bits of info are returned as pointers to data or functions --- */
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case SNDINFO_PTR_SET_INFO: info->set_info = okim6295_set_info; break;
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case SNDINFO_PTR_START: info->start = okim6295_start; break;
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case SNDINFO_PTR_STOP: /* nothing */ break;
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case SNDINFO_PTR_RESET: info->reset = okim6295_reset; break;
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/* --- the following bits of info are returned as NULL-terminated strings --- */
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case SNDINFO_STR_NAME: info->s = "OKI6295"; break;
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case SNDINFO_STR_CORE_FAMILY: info->s = "OKI ADPCM"; break;
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case SNDINFO_STR_CORE_VERSION: info->s = "1.0"; break;
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case SNDINFO_STR_CORE_FILE: info->s = __FILE__; break;
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case SNDINFO_STR_CORE_CREDITS: info->s = "Copyright Nicola Salmoria and the MAME Team"; break;
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}
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}
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