WAV File Player
[Media Ports Framework]

Audio playback from WAV file.

Enumerations
enum	pjmedia_file_player_option { PJMEDIA_FILE_NO_LOOP = 1 }
Functions
pj_status_t	pjmedia_wav_player_port_create (pj_pool_t *pool, const char *filename, unsigned ptime, unsigned flags, pj_ssize_t buff_size, pjmedia_port **p_port)
pj_ssize_t	pjmedia_wav_player_get_len (pjmedia_port *port)
pj_status_t	pjmedia_wav_player_port_set_pos (pjmedia_port *port, pj_uint32_t offset)
pj_ssize_t	pjmedia_wav_player_port_get_pos (pjmedia_port *port)
pj_status_t	pjmedia_wav_player_set_eof_cb (pjmedia_port *port, void *user_data, pj_status_t(*cb)(pjmedia_port *port, void *usr_data))

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Enumeration Type Documentation

enum pjmedia_file_player_option

WAV file player options.

Enumerator:

PJMEDIA_FILE_NO_LOOP

Tell the file player to return NULL frame when the whole file has been played.

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Function Documentation

pj_status_t pjmedia_wav_player_port_create	(	pj_pool_t *	pool,
		const char *	filename,
		unsigned	ptime,
		unsigned	flags,
		pj_ssize_t	buff_size,
		pjmedia_port **	p_port
	)

Create a media port to play streams from a WAV file. WAV player port supports for reading WAV file with uncompressed 16 bit PCM format or compressed G.711 A-law/U-law format.

Parameters:

	pool	Pool to create memory buffers for this port.
	filename	File name to open.
	ptime	The duration (in miliseconds) of each frame read from this port. If the value is zero, the default duration (20ms) will be used.
	flags	Port creation flags.
	buff_size	Buffer size to be allocated. If the value is zero or negative, the port will use default buffer size (which is about 4KB).
	p_port	Pointer to receive the file port instance.

Returns:

PJ_SUCCESS on success.

pj_ssize_t pjmedia_wav_player_get_len

(

pjmedia_port *

port

)

Get the data length, in bytes.

Parameters:

port

The file player port.

Returns:

The length of the data, in bytes. Upon error it will return negative value.

pj_status_t pjmedia_wav_player_port_set_pos	(	pjmedia_port *	port,
		pj_uint32_t	offset
	)

Set the file play position of WAV player.

Parameters:

	port	The file player port.
	offset	Playback position in bytes, relative to the start of the payload.

Returns:

PJ_SUCCESS on success.

pj_ssize_t pjmedia_wav_player_port_get_pos

(

pjmedia_port *

port

)

Get the file play position of WAV player.

Parameters:

port

The file player port.

Returns:

PJ_SUCCESS on success.

pj_status_t pjmedia_wav_player_set_eof_cb	(	pjmedia_port *	port,
		void *	user_data,
		pj_status_t(*)(pjmedia_port *port, void *usr_data)	cb
	)

Register a callback to be called when the file reading has reached the end of file. If the file is set to play repeatedly, then the callback will be called multiple times. Note that only one callback can be registered for each file port.

Parameters:

	port	The file player port.
	user_data	User data to be specified in the callback
	cb	Callback to be called. If the callback returns non- PJ_SUCCESS, the playback will stop. Note that if application destroys the file port in the callback, it must return non-PJ_SUCCESS here.

Returns:

PJ_SUCCESS on success.