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#include "emu.h"
#include "emuopts.h"
#include "streams.h"
#include "samples.h"
typedef struct _sample_channel sample_channel;
struct _sample_channel
{
sound_stream *stream;
const INT16 *source;
INT32 source_length;
INT32 source_num;
UINT32 pos;
UINT32 frac;
UINT32 step;
UINT32 basefreq;
UINT8 loop;
UINT8 paused;
};
typedef struct _samples_info samples_info;
struct _samples_info
{
running_device *device;
int numchannels; /* how many channels */
sample_channel *channel;/* array of channels */
loaded_samples *samples;/* array of samples */
};
INLINE samples_info *get_safe_token(running_device *device)
{
assert(device != NULL);
assert(device->type() == SOUND_SAMPLES);
return (samples_info *)downcast<legacy_device_base *>(device)->token();
}
#define FRAC_BITS 24
#define FRAC_ONE (1 << FRAC_BITS)
#define FRAC_MASK (FRAC_ONE - 1)
#define MAX_CHANNELS 100
/*-------------------------------------------------
read_wav_sample - read a WAV file as a sample
-------------------------------------------------*/
static int read_wav_sample(running_machine *machine, mame_file *f, loaded_sample *sample)
{
unsigned long offset = 0;
UINT32 length, rate, filesize;
UINT16 bits, temp16;
char buf[32];
UINT32 sindex;
/* read the core header and make sure it's a WAVE file */
offset += mame_fread(f, buf, 4);
if (offset < 4)
return 0;
if (memcmp(&buf[0], "RIFF", 4) != 0)
return 0;
/* get the total size */
offset += mame_fread(f, &filesize, 4);
if (offset < 8)
return 0;
filesize = LITTLE_ENDIANIZE_INT32(filesize);
/* read the RIFF file type and make sure it's a WAVE file */
offset += mame_fread(f, buf, 4);
if (offset < 12)
return 0;
if (memcmp(&buf[0], "WAVE", 4) != 0)
return 0;
/* seek until we find a format tag */
while (1)
{
offset += mame_fread(f, buf, 4);
offset += mame_fread(f, &length, 4);
length = LITTLE_ENDIANIZE_INT32(length);
if (memcmp(&buf[0], "fmt ", 4) == 0)
break;
/* seek to the next block */
mame_fseek(f, length, SEEK_CUR);
offset += length;
if (offset >= filesize)
return 0;
}
/* read the format -- make sure it is PCM */
offset += mame_fread(f, &temp16, 2);
temp16 = LITTLE_ENDIANIZE_INT16(temp16);
if (temp16 != 1)
return 0;
/* number of channels -- only mono is supported */
offset += mame_fread(f, &temp16, 2);
temp16 = LITTLE_ENDIANIZE_INT16(temp16);
if (temp16 != 1)
return 0;
/* sample rate */
offset += mame_fread(f, &rate, 4);
rate = LITTLE_ENDIANIZE_INT32(rate);
/* bytes/second and block alignment are ignored */
offset += mame_fread(f, buf, 6);
/* bits/sample */
offset += mame_fread(f, &bits, 2);
bits = LITTLE_ENDIANIZE_INT16(bits);
if (bits != 8 && bits != 16)
return 0;
/* seek past any extra data */
mame_fseek(f, length - 16, SEEK_CUR);
offset += length - 16;
/* seek until we find a data tag */
while (1)
{
offset += mame_fread(f, buf, 4);
offset += mame_fread(f, &length, 4);
length = LITTLE_ENDIANIZE_INT32(length);
if (memcmp(&buf[0], "data", 4) == 0)
break;
/* seek to the next block */
mame_fseek(f, length, SEEK_CUR);
offset += length;
if (offset >= filesize)
return 0;
}
/* if there was a 0 length data block, we're done */
if (length == 0)
return 0;
/* fill in the sample data */
sample->length = length;
sample->frequency = rate;
/* read the data in */
if (bits == 8)
{
unsigned char *tempptr;
int sindex;
sample->data = auto_alloc_array(machine, INT16, length);
mame_fread(f, sample->data, length);
/* convert 8-bit data to signed samples */
tempptr = (unsigned char *)sample->data;
for (sindex = length - 1; sindex >= 0; sindex--)
sample->data[sindex] = (INT8)(tempptr[sindex] ^ 0x80) * 256;
}
else
{
/* 16-bit data is fine as-is */
sample->data = auto_alloc_array(machine, INT16, length/2);
mame_fread(f, sample->data, length);
sample->length /= 2;
if (ENDIANNESS_NATIVE != ENDIANNESS_LITTLE)
for (sindex = 0; sindex < sample->length; sindex++)
sample->data[sindex] = LITTLE_ENDIANIZE_INT16(sample->data[sindex]);
}
return 1;
}
/*-------------------------------------------------
readsamples - load all samples
-------------------------------------------------*/
loaded_samples *readsamples(running_machine *machine, const char *const *samplenames, const char *basename)
{
loaded_samples *samples;
int skipfirst = 0;
int i;
/* if the user doesn't want to use samples, bail */
if (!options_get_bool(mame_options(), OPTION_SAMPLES))
return NULL;
if (samplenames == 0 || samplenames[0] == 0)
return NULL;
/* if a name begins with '*', we will also look under that as an alternate basename */
if (samplenames[0][0] == '*')
skipfirst = 1;
/* count the samples */
for (i = 0; samplenames[i+skipfirst] != 0; i++) ;
if (i == 0)
return NULL;
/* allocate the array */
samples = (loaded_samples *)auto_alloc_array_clear(machine, UINT8, sizeof(loaded_samples) + (i-1) * sizeof(loaded_sample));
samples->total = i;
/* load the samples */
for (i = 0; i < samples->total; i++)
if (samplenames[i+skipfirst][0])
{
file_error filerr;
mame_file *f;
astring fname(basename, PATH_SEPARATOR, samplenames[i+skipfirst]);
filerr = mame_fopen(SEARCHPATH_SAMPLE, fname, OPEN_FLAG_READ, &f);
if (filerr != FILERR_NONE && skipfirst)
{
astring fname(samplenames[0] + 1, PATH_SEPARATOR, samplenames[i+skipfirst]);
filerr = mame_fopen(SEARCHPATH_SAMPLE, fname, OPEN_FLAG_READ, &f);
}
if (filerr == FILERR_NONE)
{
read_wav_sample(machine, f, &samples->sample[i]);
mame_fclose(f);
}
}
return samples;
}
/* Start one of the samples loaded from disk. Note: channel must be in the range */
/* 0 .. Samplesinterface->channels-1. It is NOT the discrete channel to pass to */
/* mixer_play_sample() */
void sample_start(running_device *device,int channel,int samplenum,int loop)
{
samples_info *info = get_safe_token(device);
sample_channel *chan;
loaded_sample *sample;
/* if samples are disabled, just return quietly */
if (info->samples == NULL)
return;
assert( samplenum < info->samples->total );
assert( channel < info->numchannels );
chan = &info->channel[channel];
/* force an update before we start */
stream_update(chan->stream);
/* update the parameters */
sample = &info->samples->sample[samplenum];
chan->source = sample->data;
chan->source_length = sample->length;
chan->source_num = sample->data ? samplenum : -1;
chan->pos = 0;
chan->frac = 0;
chan->basefreq = sample->frequency;
chan->step = ((INT64)chan->basefreq << FRAC_BITS) / info->device->machine->sample_rate;
chan->loop = loop;
}
void sample_start_raw(running_device *device,int channel,const INT16 *sampledata,int samples,int frequency,int loop)
{
samples_info *info = get_safe_token(device);
sample_channel *chan;
assert( channel < info->numchannels );
chan = &info->channel[channel];
/* force an update before we start */
stream_update(chan->stream);
/* update the parameters */
chan->source = sampledata;
chan->source_length = samples;
chan->source_num = -1;
chan->pos = 0;
chan->frac = 0;
chan->basefreq = frequency;
chan->step = ((INT64)chan->basefreq << FRAC_BITS) / info->device->machine->sample_rate;
chan->loop = loop;
}
void sample_set_freq(running_device *device,int channel,int freq)
{
samples_info *info = get_safe_token(device);
sample_channel *chan;
assert( channel < info->numchannels );
chan = &info->channel[channel];
/* force an update before we start */
stream_update(chan->stream);
chan->step = ((INT64)freq << FRAC_BITS) / info->device->machine->sample_rate;
}
void sample_set_volume(running_device *device,int channel,float volume)
{
samples_info *info = get_safe_token(device);
sample_channel *chan;
assert( channel < info->numchannels );
chan = &info->channel[channel];
stream_set_output_gain(chan->stream, 0, volume);
}
void sample_set_pause(running_device *device,int channel,int pause)
{
samples_info *info = get_safe_token(device);
sample_channel *chan;
assert( channel < info->numchannels );
chan = &info->channel[channel];
/* force an update before we start */
stream_update(chan->stream);
chan->paused = pause;
}
void sample_stop(running_device *device,int channel)
{
samples_info *info = get_safe_token(device);
sample_channel *chan;
assert( channel < info->numchannels );
chan = &info->channel[channel];
/* force an update before we start */
stream_update(chan->stream);
chan->source = NULL;
chan->source_num = -1;
}
int sample_get_base_freq(running_device *device,int channel)
{
samples_info *info = get_safe_token(device);
sample_channel *chan;
assert( channel < info->numchannels );
chan = &info->channel[channel];
/* force an update before we start */
stream_update(chan->stream);
return chan->basefreq;
}
int sample_playing(running_device *device,int channel)
{
samples_info *info = get_safe_token(device);
sample_channel *chan;
assert( channel < info->numchannels );
chan = &info->channel[channel];
/* force an update before we start */
stream_update(chan->stream);
return (chan->source != NULL);
}
static STREAM_UPDATE( sample_update_sound )
{
sample_channel *chan = (sample_channel *)param;
stream_sample_t *buffer = outputs[0];
if (chan->source && !chan->paused)
{
/* load some info locally */
UINT32 pos = chan->pos;
UINT32 frac = chan->frac;
UINT32 step = chan->step;
const INT16 *sample = chan->source;
UINT32 sample_length = chan->source_length;
while (samples--)
{
/* do a linear interp on the sample */
INT32 sample1 = sample[pos];
INT32 sample2 = sample[(pos + 1) % sample_length];
INT32 fracmult = frac >> (FRAC_BITS - 14);
*buffer++ = ((0x4000 - fracmult) * sample1 + fracmult * sample2) >> 14;
/* advance */
frac += step;
pos += frac >> FRAC_BITS;
frac = frac & ((1 << FRAC_BITS) - 1);
/* handle looping/ending */
if (pos >= sample_length)
{
if (chan->loop)
pos %= sample_length;
else
{
chan->source = NULL;
chan->source_num = -1;
if (samples > 0)
memset(buffer, 0, samples * sizeof(*buffer));
break;
}
}
}
/* push position back out */
chan->pos = pos;
chan->frac = frac;
}
else
memset(buffer, 0, samples * sizeof(*buffer));
}
static STATE_POSTLOAD( samples_postload )
{
samples_info *info = (samples_info *)param;
int i;
/* loop over channels */
for (i = 0; i < info->numchannels; i++)
{
sample_channel *chan = &info->channel[i];
/* attach any samples that were loaded and playing */
if (chan->source_num >= 0 && chan->source_num < info->samples->total)
{
loaded_sample *sample = &info->samples->sample[chan->source_num];
chan->source = sample->data;
chan->source_length = sample->length;
if (!sample->data)
chan->source_num = -1;
}
/* validate the position against the length in case the sample is smaller */
if (chan->source && chan->pos >= chan->source_length)
{
if (chan->loop)
chan->pos %= chan->source_length;
else
{
chan->source = NULL;
chan->source_num = -1;
}
}
}
}
static DEVICE_START( samples )
{
int i;
const samples_interface *intf = (const samples_interface *)device->baseconfig().static_config();
samples_info *info = get_safe_token(device);
info->device = device;
/* read audio samples */
if (intf->samplenames)
info->samples = readsamples(device->machine, intf->samplenames,device->machine->gamedrv->name);
/* allocate channels */
info->numchannels = intf->channels;
assert(info->numchannels < MAX_CHANNELS);
info->channel = auto_alloc_array(device->machine, sample_channel, info->numchannels);
for (i = 0; i < info->numchannels; i++)
{
info->channel[i].stream = stream_create(device, 0, 1, device->machine->sample_rate, &info->channel[i], sample_update_sound);
info->channel[i].source = NULL;
info->channel[i].source_num = -1;
info->channel[i].step = 0;
info->channel[i].loop = 0;
info->channel[i].paused = 0;
/* register with the save state system */
state_save_register_device_item(device, i, info->channel[i].source_length);
state_save_register_device_item(device, i, info->channel[i].source_num);
state_save_register_device_item(device, i, info->channel[i].pos);
state_save_register_device_item(device, i, info->channel[i].frac);
state_save_register_device_item(device, i, info->channel[i].step);
state_save_register_device_item(device, i, info->channel[i].loop);
state_save_register_device_item(device, i, info->channel[i].paused);
}
state_save_register_postload(device->machine, samples_postload, info);
/* initialize any custom handlers */
if (intf->start)
(*intf->start)(device);
}
/**************************************************************************
* Generic get_info
**************************************************************************/
DEVICE_GET_INFO( samples )
{
switch (state)
{
/* --- the following bits of info are returned as 64-bit signed integers --- */
case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(samples_info); break;
/* --- the following bits of info are returned as pointers to data or functions --- */
case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( samples ); break;
case DEVINFO_FCT_STOP: /* Nothing */ break;
case DEVINFO_FCT_RESET: /* Nothing */ break;
/* --- the following bits of info are returned as NULL-terminated strings --- */
case DEVINFO_STR_NAME: strcpy(info->s, "Samples"); break;
case DEVINFO_STR_FAMILY: strcpy(info->s, "Big Hack"); break;
case DEVINFO_STR_VERSION: strcpy(info->s, "1.1"); break;
case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright Nicola Salmoria and the MAME Team"); break;
}
}
DEFINE_LEGACY_SOUND_DEVICE(SAMPLES, samples);
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