From 7c19aac60e12d6f5ea301bdb34d7826a01e0b06f Mon Sep 17 00:00:00 2001 From: Miodrag Milanovic Date: Sun, 8 Nov 2015 12:56:12 +0100 Subject: Rename *.c -> *.cpp in our source (nw) --- src/lib/formats/pmd_cas.cpp | 218 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 src/lib/formats/pmd_cas.cpp (limited to 'src/lib/formats/pmd_cas.cpp') diff --git a/src/lib/formats/pmd_cas.cpp b/src/lib/formats/pmd_cas.cpp new file mode 100644 index 00000000000..ba5baee1a65 --- /dev/null +++ b/src/lib/formats/pmd_cas.cpp @@ -0,0 +1,218 @@ +// license:BSD-3-Clause +// copyright-holders:Sandro Ronco +/******************************************************************** + + Support for PMD 85 cassette images + + Supported formats: + - pmd: raw image + - ptp: PMD 85 tape package + +********************************************************************/ + +#include + +#include "pmd_cas.h" + +#define WAVEENTRY_LOW -32768 +#define WAVEENTRY_HIGH 32767 + +#define PMD85_WAV_FREQUENCY 7200 +#define PMD85_TIMER_FREQUENCY 1200 +#define PMD85_BIT_LENGTH (PMD85_WAV_FREQUENCY/PMD85_TIMER_FREQUENCY) +#define PMD85_PILOT_BITS (PMD85_TIMER_FREQUENCY*3) +#define PMD85_PAUSE_BITS (PMD85_TIMER_FREQUENCY/2) +#define PMD85_HEADER_BYTES 63 +#define PMD85_BITS_PER_BYTE 11 + +// image size +static int pmd85_image_size; + +static int pmd85_emit_level(INT16 *buffer, int sample_pos, int count, int level) +{ + if (buffer) + { + for (int i=0; i>i) & 0x01); + + /* stop */ + samples += pmd85_output_bit (buffer, sample_pos + samples, 1); + samples += pmd85_output_bit (buffer, sample_pos + samples, 1); + + return samples; +} + +static bool pmd85_is_header_block(const UINT8 *bytes) +{ + for (int i=0; i<0x10; i++) + { + if (bytes[i] != 0xff || bytes[i + 0x10] != 0x00 || bytes[i + 0x20] != 0x55) + return false; + } + + return true; +} + +static void pmd85_printf_image_info(const UINT8 *bytes, int sample_count) +{ +#if 0 + char track_name[9]; + UINT32 sec = (UINT32)(sample_count/PMD85_WAV_FREQUENCY); + UINT16 addr = (bytes[0x33]<<8) | bytes[0x32]; + strncpy(track_name, (char*)&bytes[0x36], 8); + track_name[8] = '\0'; + + printf("Block ID: %02d %s 0x%04x Tape pos: %02d:%02d\n", bytes[0x30], track_name, addr, sec/60, sec%60); +#endif +} + +static int pmd85_handle_cassette(INT16 *buffer, const UINT8 *bytes) +{ + int sample_count = 0; + + if (pmd85_is_header_block(bytes)) + { + // PMD file + + /* pilot */ + for (int i=0; i