ym64.c File Reference

Player for the .YM64 module format (Arkos Tracker 2) More...

Data Structures
struct	ym5header
	Header of a YM5 file. More...

Functions
void	ym64player_open (ym64player_t *player, const char *fn, ym64player_songinfo_t *info)
	Open a YM64 file for playback.
int	ym64player_num_channels (ym64player_t *player)
	Return the number of channels used in the mixer for playback.
void	ym64player_play (ym64player_t *player, int first_ch)
	Start playback of a YM file.
void	ym64player_stop (ym64player_t *player)
	Stop YM playback.
void	ym64player_duration (ym64player_t *player, int *len, float *secs)
	Read the total duration the YM module.
void	ym64player_tell (ym64player_t *player, int *pos, float *secs)
	Read the current position of the YM module.
bool	ym64player_seek (ym64player_t *player, int pos)
	Seek to a specific position in the YM module.
void	ym64player_close (ym64player_t *player)
	Close and deallocate the YM64 player.

Detailed Description

Player for the .YM64 module format (Arkos Tracker 2)

Author

Giovanni Bajo giova.nosp@m.nnib.nosp@m.ajo@g.nosp@m.mail.nosp@m..com

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Data Structure Documentation

ym5header

struct ym5header

Header of a YM5 file.

Data Fields
uint32_t	nframes	Number of audioframes.
uint32_t	attrs	Attributes (bit 0: interleaved format)
uint16_t	ndigidrums	Number of digital samples.
uint32_t	chipfreq	Frequency of the emulated chip.
uint16_t	playfreq	Playback frequency in audioframes per seconds (eg: 50)
uint32_t	loop	Audioframe where the loop starts.
uint16_t	sizeext	Extension (always 0)

Function Documentation

ym64player_open()

void ym64player_open	(	ym64player_t *	player,
		const char *	fn,
		ym64player_songinfo_t *	info
	)

Open a YM64 file for playback.

Parameters

[in]	player	YM64 player to initialize
[in]	fn	Filename of the XM64 (with filesystem prefix, e.g. rom://).
[out]	info	Optional structure to fill with information on the song (pass NULL if not needed)

ym64player_num_channels()

int ym64player_num_channels

(

ym64player_t *

player

)

Return the number of channels used in the mixer for playback.

Depending on the AY emulator compile-time settings, this could be either 1 or 2 (mono or stereo). Notice that the YM64 currently mixes itself the 3 internal channels of the AY8910 chip, so only a final output stream is passed to the mixer.

Parameters

[in]

player

YM64 player

Returns

Number of mixer channels.

ym64player_play()

void ym64player_play	(	ym64player_t *	player,
		int	first_ch
	)

Start playback of a YM file.

Parameters

[in]	player	YM64 player
[in]	first_ch	First mixer channel to use for playback

ym64player_stop()

void ym64player_stop

(

ym64player_t *

player

)

Stop YM playback.

The YM module will keep the current position. Use ym64player_play to continue playback.

ym64player_duration()

void ym64player_duration	(	ym64player_t *	player,
		int *	len,
		float *	secs
	)

Read the total duration the YM module.

The function returns the total duration of the YM module, in ticks (internal YM position) or seconds. You can pass NULL to information that you are not interested in receiving.

Parameters

[in]	player	YM64 player
[out]	len	Total duration in ticks
[out]	secs	Total duration in seconds

ym64player_tell()

void ym64player_tell	(	ym64player_t *	player,
		int *	pos,
		float *	secs
	)

Read the current position of the YM module.

The function returns the current position expressed in ticks (internal YM position), and also expressed as number of seconds. You can pass NULL to information that you are not interested in receiving.

Parameters

[in]	player	YM64 player
[out]	pos	Current position in ticks
[out]	secs	Current position in seconds

ym64player_seek()

bool ym64player_seek	(	ym64player_t *	player,
		int	pos
	)

Seek to a specific position in the YM module.

The function seeks to a new absolute position expressed in ticks (internal YM position). Notice that it's not possible to seek in a YM64 file that has been compressed. audioconv64 compresses YM files by default.

Parameters

[in]	player	YM64 player
[out]	pos	Absolute position in ticks

Returns

True if it was possible to seek, false if the file is compressed.