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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/apf_apt.c | |
parent | a57b46ae933badd7441ce1644711dbb851e2b504 (diff) |
Rename *.c -> *.cpp in our source (nw)
Diffstat (limited to 'src/lib/formats/apf_apt.c')
-rw-r--r-- | src/lib/formats/apf_apt.c | 252 |
1 files changed, 0 insertions, 252 deletions
diff --git a/src/lib/formats/apf_apt.c b/src/lib/formats/apf_apt.c deleted file mode 100644 index b609a109ef6..00000000000 --- a/src/lib/formats/apf_apt.c +++ /dev/null @@ -1,252 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders: Original author, Robbbert -/******************************************************************** - -Support for APF Imagination Machine cassette images - -CPF and CAS images consist of the screen and then the program, -and are exactly 1E00 bytes in length. - -APT images are much the same, however it includes a series of FF -bytes as a header. There's also a large amount of what seems to -be rubbish at the end. - -APW images are not emulated, and are used by the closed-source -emulator APF_EMUW. Quote: "They allow recording in special formats -and recording audio. They are audio files sampled at 11025 Hz 8 bits -unsigned mono, without header. The bit 1 stores the state of the -recording head." - -S19 images are not emulated, however there's no need to as they -are only used to hold cartridge hex dumps. - -TXT images can be copy/pasted by using the Paste menu option. - -Each byte after conversion becomes bit 7,6,etc to 0, There are -no start or stop bits. - -An actual tape consists of 6 sections -a. silence until you press Enter (no offset) -b. 11secs of high bits then 1 low bit -c. The screen ram -d. The program ram -e. A checksum byte (8-bit addition) - -********************************************************************/ - -#include <assert.h> - -#include "formats/apf_apt.h" - -#define WAVEENTRY_LOW -32768 -#define WAVEENTRY_HIGH 32767 - -/* frequency of wave */ -#define APF_WAV_FREQUENCY 8000 - -/* 500 microsecond of bit 0 and 1000 microsecond of bit 1 */ -static int apf_image_size; - -static int apf_put_samples(INT16 *buffer, int sample_pos, int count, int level) -{ - if (buffer) - { - for (int i=0; i<count; i++) - buffer[sample_pos + i] = level; - } - - return count; -} - -static int apf_output_bit(INT16 *buffer, int sample_pos, bool bit) -{ - int samples = 0; - - if (bit) - { - samples += apf_put_samples(buffer, sample_pos + samples, 4, WAVEENTRY_HIGH); - samples += apf_put_samples(buffer, sample_pos + samples, 4, WAVEENTRY_LOW); - } - else - { - samples += apf_put_samples(buffer, sample_pos + samples, 2, WAVEENTRY_HIGH); - samples += apf_put_samples(buffer, sample_pos + samples, 2, WAVEENTRY_LOW); - } - - return samples; -} - -static int apf_output_byte(INT16 *buffer, int sample_pos, UINT8 byte) -{ - int samples = 0; - UINT8 i; - - /* data */ - for (i = 0; i<8; i++) - samples += apf_output_bit (buffer, sample_pos + samples, (byte >> (7-i)) & 1); - - return samples; -} - -static int apf_apt_handle_cassette(INT16 *buffer, const UINT8 *bytes) -{ - UINT32 sample_count = 0; - UINT32 i; - UINT8 cksm = 0; - UINT32 temp = 0; - - // silence - sample_count += apf_put_samples(buffer, 0, 12000, 0); - - for (i=0; i<apf_image_size; i++) - { - sample_count += apf_output_byte(buffer, sample_count, bytes[i]); - if (bytes[i]==0xfe) - { - temp = i+1; - i = apf_image_size; - } - } - - /* data */ - for (i= temp; i<(temp+0x1e00); i++) - { - cksm += bytes[i]; - sample_count += apf_output_byte(buffer, sample_count, bytes[i]); - } - - /* checksum byte */ - sample_count += apf_output_byte(buffer, sample_count, cksm); - - return sample_count; -} - -static int apf_cpf_handle_cassette(INT16 *buffer, const UINT8 *bytes) -{ - UINT32 sample_count = 0; - UINT32 i; - UINT8 cksm = 0; - - // silence - sample_count += apf_put_samples(buffer, 0, 12000, 0); - - /* start */ - for (i=0; i<10000; i++) - sample_count += apf_output_bit(buffer, sample_count, 1); - - sample_count += apf_output_bit(buffer, sample_count, 0); - - /* data */ - for (i=0; i<apf_image_size; i++) - { - cksm += bytes[i]; - sample_count += apf_output_byte(buffer, sample_count, bytes[i]); - } - - /* checksum byte */ - sample_count += apf_output_byte(buffer, sample_count, cksm); - - return sample_count; -} - - -/******************************************************************* - Generate samples for the tape image -********************************************************************/ - -static int apf_apt_fill_wave(INT16 *buffer, int length, UINT8 *bytes) -{ - return apf_apt_handle_cassette(buffer, bytes); -} - -static int apf_cpf_fill_wave(INT16 *buffer, int length, UINT8 *bytes) -{ - return apf_cpf_handle_cassette(buffer, bytes); -} - -/******************************************************************* - Calculate the number of samples needed for this tape image -********************************************************************/ - -static int apf_apt_calculate_size_in_samples(const UINT8 *bytes, int length) -{ - apf_image_size = length; - - return apf_apt_handle_cassette(NULL, bytes); -} - -static int apf_cpf_calculate_size_in_samples(const UINT8 *bytes, int length) -{ - apf_image_size = length; - - return apf_cpf_handle_cassette(NULL, bytes); -} - -//********************************************************************************* - -static const struct CassetteLegacyWaveFiller apf_cpf_fill_intf = -{ - apf_cpf_fill_wave, /* fill_wave */ - -1, /* chunk_size */ - 0, /* chunk_samples */ - apf_cpf_calculate_size_in_samples, /* chunk_sample_calc */ - APF_WAV_FREQUENCY, /* sample_frequency */ - 0, /* header_samples */ - 0 /* trailer_samples */ -}; - -static casserr_t apf_cpf_identify(cassette_image *cassette, struct CassetteOptions *opts) -{ - return cassette_legacy_identify(cassette, opts, &apf_cpf_fill_intf); -} - -static casserr_t apf_cpf_load(cassette_image *cassette) -{ - return cassette_legacy_construct(cassette, &apf_cpf_fill_intf); -} - -static const struct CassetteFormat apf_cpf_format = -{ - "cas,cpf", - apf_cpf_identify, - apf_cpf_load, - NULL -}; - -//********************************************************************************* - -static const struct CassetteLegacyWaveFiller apf_apt_fill_intf = -{ - apf_apt_fill_wave, /* fill_wave */ - -1, /* chunk_size */ - 0, /* chunk_samples */ - apf_apt_calculate_size_in_samples, /* chunk_sample_calc */ - APF_WAV_FREQUENCY, /* sample_frequency */ - 0, /* header_samples */ - 0 /* trailer_samples */ -}; - -static casserr_t apf_apt_identify(cassette_image *cassette, struct CassetteOptions *opts) -{ - return cassette_legacy_identify(cassette, opts, &apf_apt_fill_intf); -} - -static casserr_t apf_apt_load(cassette_image *cassette) -{ - return cassette_legacy_construct(cassette, &apf_apt_fill_intf); -} - -static const struct CassetteFormat apf_apt_format = -{ - "apt", - apf_apt_identify, - apf_apt_load, - NULL -}; - -//********************************************************************************* - -CASSETTE_FORMATLIST_START(apf_cassette_formats) - CASSETTE_FORMAT(apf_cpf_format) - CASSETTE_FORMAT(apf_apt_format) -CASSETTE_FORMATLIST_END |