/* Author: Romain "Artefact2" Dalmaso */ /* Contributor: Dan Spencer */ /* This program is free software. It comes without any warranty, to the * extent permitted by applicable law. You can redistribute it and/or * modify it under the terms of the Do What The Fuck You Want To Public * License, Version 2, as published by Sam Hocevar. See * http://sam.zoy.org/wtfpl/COPYING for more details. */ #pragma once #ifndef __has_xm_h #define __has_xm_h #include #include #include #ifdef __cplusplus extern "C" { #endif struct xm_context_s; typedef struct xm_context_s xm_context_t; /** Create a XM context. * * @param moddata the contents of the module * @param rate play rate in Hz, recommended value of 48000 * * @returns 0 on success * @returns 1 if module data is not sane * @returns 2 if memory allocation failed * * @deprecated This function is unsafe! * @see xm_create_context_safe() */ int xm_create_context(xm_context_t**, const char* moddata, uint32_t rate); /** Create a XM context. * * @param moddata the contents of the module * @param moddata_length the length of the contents of the module, in bytes * @param rate play rate in Hz, recommended value of 48000 * * @returns 0 on success * @returns 1 if module data is not sane * @returns 2 if memory allocation failed */ int xm_create_context_safe(xm_context_t**, const char* moddata, size_t moddata_length, uint32_t rate); /** Free a XM context created by xm_create_context(). */ void xm_free_context(xm_context_t*); /** Play the module and put the sound samples in an output buffer. * * @param output buffer of 2*numsamples elements * @param maximum numsamples number of samples to generate * * @return number of generated samples. */ int xm_generate_samples(xm_context_t*, float* output, size_t numsamples); /** Seeks to the start clearing the loop count. * * @return number of generated samples. */ void xm_restart(xm_context_t*); /** Set the maximum number of times a module can loop. After the * specified number of loops, calls to xm_generate_samples will only * generate silence. You can control the current number of loops with * xm_get_loop_count(). * * @param loopcnt maximum number of loops. Use 0 to loop * indefinitely. */ void xm_set_max_loop_count(xm_context_t*, uint8_t loopcnt); /** Get the loop count of the currently playing module. This value is * 0 when the module is still playing, 1 when the module has looped * once, etc. */ uint8_t xm_get_loop_count(xm_context_t*); /** Seek to a specific position in a module. * * WARNING, WITH BIG LETTERS: seeking modules is broken by design, * don't expect miracles. */ void xm_seek(xm_context_t*, uint8_t pot, uint8_t row, uint16_t tick); /** Mute or unmute a channel. * * @note Channel numbers go from 1 to xm_get_number_of_channels(...). * * @return whether the channel was muted. */ bool xm_mute_channel(xm_context_t*, uint16_t, bool); /** Mute or unmute an instrument. * * @note Instrument numbers go from 1 to * xm_get_number_of_instruments(...). * * @return whether the instrument was muted. */ bool xm_mute_instrument(xm_context_t*, uint16_t, bool); /** Get the module name as a NUL-terminated string. */ const char* xm_get_module_name(xm_context_t*); /** Get the tracker name as a NUL-terminated string. */ const char* xm_get_tracker_name(xm_context_t*); /** Get the number of channels. */ uint16_t xm_get_number_of_channels(xm_context_t*); /** Get the module length (in patterns). */ uint16_t xm_get_module_length(xm_context_t*); /** Get the number of patterns. */ uint16_t xm_get_number_of_patterns(xm_context_t*); /** Get the number of rows of a pattern. * * @note Pattern numbers go from 0 to * xm_get_number_of_patterns(...)-1. */ uint16_t xm_get_number_of_rows(xm_context_t*, uint16_t); /** Get the number of instruments. */ uint16_t xm_get_number_of_instruments(xm_context_t*); /** Get the number of samples of an instrument. * * @note Instrument numbers go from 1 to * xm_get_number_of_instruments(...). */ uint16_t xm_get_number_of_samples(xm_context_t*, uint16_t); /** Get the internal buffer for a given sample waveform. * * This buffer can be read from or written to, at any time, but the * length cannot change. The buffer must be cast to (int8_t*) or * (int16_t*) depending on the sample type. * * @note Instrument numbers go from 1 to * xm_get_number_of_instruments(...). * * @note Sample numbers go from 0 to * xm_get_nubmer_of_samples(...,instr)-1. */ void* xm_get_sample_waveform(xm_context_t*, uint16_t instr, uint16_t sample, size_t* length, uint8_t* bits); /** Get the current module speed. * * @param bpm will receive the current BPM * @param tempo will receive the current tempo (ticks per line) */ void xm_get_playing_speed(xm_context_t*, uint16_t* bpm, uint16_t* tempo); /** Get the current position in the module being played. * * @param pattern_index if not NULL, will receive the current pattern * index in the POT (pattern order table) * * @param pattern if not NULL, will receive the current pattern number * * @param row if not NULL, will receive the current row * * @param samples if not NULL, will receive the total number of * generated samples (divide by sample rate to get seconds of * generated audio) */ void xm_get_position(xm_context_t*, uint8_t* pattern_index, uint8_t* pattern, uint8_t* row, uint64_t* samples); /** Get the latest time (in number of generated samples) when a * particular instrument was triggered in any channel. * * @note Instrument numbers go from 1 to * xm_get_number_of_instruments(...). */ uint64_t xm_get_latest_trigger_of_instrument(xm_context_t*, uint16_t); /** Get the latest time (in number of generated samples) when a * particular sample was triggered in any channel. * * @note Instrument numbers go from 1 to * xm_get_number_of_instruments(...). * * @note Sample numbers go from 0 to * xm_get_nubmer_of_samples(...,instr)-1. */ uint64_t xm_get_latest_trigger_of_sample(xm_context_t*, uint16_t instr, uint16_t sample); /** Get the latest time (in number of generated samples) when any * instrument was triggered in a given channel. * * @note Channel numbers go from 1 to xm_get_number_of_channels(...). */ uint64_t xm_get_latest_trigger_of_channel(xm_context_t*, uint16_t); /** Checks whether a channel is active (ie: is playing something). * * @note Channel numbers go from 1 to xm_get_number_of_channels(...). */ bool xm_is_channel_active(xm_context_t*, uint16_t); /** Get the instrument number currently playing in a channel. * * @returns instrument number, or 0 if channel is not active. * * @note Channel numbers go from 1 to xm_get_number_of_channels(...). * * @note Instrument numbers go from 1 to * xm_get_number_of_instruments(...). */ uint16_t xm_get_instrument_of_channel(xm_context_t*, uint16_t); /** Get the frequency of the sample currently playing in a channel. * * @returns a frequency in Hz. If the channel is not active, return * value is undefined. * * @note Channel numbers go from 1 to xm_get_number_of_channels(...). */ float xm_get_frequency_of_channel(xm_context_t*, uint16_t); /** Get the volume of the sample currently playing in a channel. This * takes into account envelopes, etc. * * @returns a volume between 0 or 1. If the channel is not active, * return value is undefined. * * @note Channel numbers go from 1 to xm_get_number_of_channels(...). */ float xm_get_volume_of_channel(xm_context_t*, uint16_t); /** Get the panning of the sample currently playing in a channel. This * takes into account envelopes, etc. * * @returns a panning between 0 (L) and 1 (R). If the channel is not * active, return value is undefined. * * @note Channel numbers go from 1 to xm_get_number_of_channels(...). */ float xm_get_panning_of_channel(xm_context_t*, uint16_t); #ifdef __cplusplus } #endif #endif