mirror of
https://github.com/holub/mame
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ddb290d5f6
Use standard uint64_t, uint32_t, uint16_t or uint8_t instead of UINT64, UINT32, UINT16 or UINT8 also use standard int64_t, int32_t, int16_t or int8_t instead of INT64, INT32, INT16 or INT8
98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Angelo Salese
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/*
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* NEC PC-6001 cassette format handling
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*/
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#include <assert.h>
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#include "p6001_cas.h"
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#define WAVE_HIGH 0x5a9e
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#define WAVE_LOW -0x5a9e
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static int cas_size;
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static int pc6001_fill_wave(int16_t* buffer, uint8_t data, int sample_pos)
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{
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int x;
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int sample_count = 0;
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// one byte = 8 samples
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for(x=0;x<8;x++)
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{
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if(buffer)
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buffer[sample_pos+x] = ((data >> (7-x)) & 1) ? WAVE_HIGH : WAVE_LOW;
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}
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sample_count+=8;
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return sample_count;
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}
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static int pc6001_handle_cas(int16_t* buffer, const uint8_t* casdata)
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{
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int sample_count = 0;
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int data_pos = 0;
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while(sample_count < cas_size)
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{
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sample_count += pc6001_fill_wave(buffer,casdata[data_pos],sample_count);
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data_pos++;
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}
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return sample_count;
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}
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/*******************************************************************
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Calculate the number of samples needed for this tape image
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********************************************************************/
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static int pc6001_cas_to_wav_size (const uint8_t *casdata, int caslen)
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{
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cas_size = caslen*8;
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return pc6001_handle_cas(nullptr,casdata);
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}
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/*******************************************************************
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Generate samples for the tape image
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********************************************************************/
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static int pc6001_cas_fill_wave(int16_t *buffer, int sample_count, uint8_t *bytes)
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{
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return pc6001_handle_cas(buffer,bytes);
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}
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static const struct CassetteLegacyWaveFiller pc6001_legacy_fill_wave =
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{
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pc6001_cas_fill_wave, /* fill_wave */
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-1, /* chunk_size */
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0, /* chunk_samples */
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pc6001_cas_to_wav_size, /* chunk_sample_calc */
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8000, /* sample_frequency */
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0, /* header_samples */
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0 /* trailer_samples */
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};
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static cassette_image::error pc6001_cas_identify(cassette_image *cassette, struct CassetteOptions *opts)
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{
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return cassette_legacy_identify(cassette, opts, &pc6001_legacy_fill_wave);
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}
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static cassette_image::error pc6001_cas_load(cassette_image *cassette)
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{
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return cassette_legacy_construct(cassette, &pc6001_legacy_fill_wave);
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}
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static const struct CassetteFormat pc6001_cassette_format = {
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"cas",
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pc6001_cas_identify,
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pc6001_cas_load,
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nullptr
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};
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CASSETTE_FORMATLIST_START(pc6001_cassette_formats)
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CASSETTE_FORMAT(pc6001_cassette_format)
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CASSETTE_FORMATLIST_END
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