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author | 2015-11-08 12:56:12 +0100 | |
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committer | 2015-11-08 12:56:12 +0100 | |
commit | 7c19aac60e12d6f5ea301bdb34d7826a01e0b06f (patch) | |
tree | f310d86aa2c6bfc19d115307dedde4eb0cd52dad /src/lib/formats/sc3000_bit.cpp | |
parent | a57b46ae933badd7441ce1644711dbb851e2b504 (diff) |
Rename *.c -> *.cpp in our source (nw)
Diffstat (limited to 'src/lib/formats/sc3000_bit.cpp')
-rw-r--r-- | src/lib/formats/sc3000_bit.cpp | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/src/lib/formats/sc3000_bit.cpp b/src/lib/formats/sc3000_bit.cpp new file mode 100644 index 00000000000..2b5fd635db5 --- /dev/null +++ b/src/lib/formats/sc3000_bit.cpp @@ -0,0 +1,106 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************* + + formats/sc3000_bit.c + + Cassette code for Sega SC-3000 *.bit files + +*********************************************************************/ + +#include <assert.h> + +#include "sc3000_bit.h" + +/*************************************************************************** + PARAMETERS +***************************************************************************/ + +#define LOG 0 + +/*************************************************************************** + IMPLEMENTATION +***************************************************************************/ + +/*------------------------------------------------- + CassetteModulation sc3000_bit_modulation +-------------------------------------------------*/ + +static const struct CassetteModulation sc3000_bit_modulation = +{ + CASSETTE_MODULATION_SINEWAVE, + 1200.0 - 300, 1200.0, 1200.0 + 300, + 2400.0 - 600, 2400.0, 2400.0 + 600 +}; + +/*------------------------------------------------- + sc3000_bit_identify - identify cassette +-------------------------------------------------*/ + +static casserr_t sc3000_bit_identify(cassette_image *cassette, struct CassetteOptions *opts) +{ + return cassette_modulation_identify( cassette, &sc3000_bit_modulation, opts); +} + +/*------------------------------------------------- + sc3000_bit_load - load cassette +-------------------------------------------------*/ + +#define MODULATE(_value) \ + for (int i = 0; i < (_value ? 2 : 1); i++) { \ + err = cassette_put_modulated_data_bit(cassette, 0, time_index, _value, &sc3000_bit_modulation, &time_displacement);\ + if (err) return err;\ + time_index += time_displacement;\ + } + +static casserr_t sc3000_bit_load(cassette_image *cassette) +{ + casserr_t err; + UINT64 image_size = cassette_image_size(cassette); + UINT64 image_pos = 0; + double time_index = 0.0; + double time_displacement; + UINT8 data; + + while (image_pos < image_size) + { + cassette_image_read(cassette, &data, image_pos, 1); + + switch (data) + { + case '1': + MODULATE(1); + break; + + case '0': + MODULATE(0); + break; + + case ' ': + err = cassette_put_sample( cassette, 0, time_index, 1/1200.0, 0); + if (err) return err; + time_index += 1/1200.0; + break; + } + + image_pos++; + } + + return CASSETTE_ERROR_SUCCESS; +} + +/*------------------------------------------------- + CassetteFormat sc3000_bit_cassette_format +-------------------------------------------------*/ + +const struct CassetteFormat sc3000_bit_format = +{ + "bit", + sc3000_bit_identify, + sc3000_bit_load, + NULL +}; + +CASSETTE_FORMATLIST_START( sc3000_cassette_formats ) + CASSETTE_FORMAT(sc3000_bit_format) +CASSETTE_FORMATLIST_END |