The Stream Information API provides functions to get audio and video stream information, such as codec type, video width or height, bit rate, and so on.

Required Header

#include <player.h>

Overview

The Player stream information API allows you to get media stream information, including:

Content metadata, such as the tile, artist, album title and genre.
Audio stream information, such as audio codec type, sample rate, channels, and bit rate.
Video stream information, such as video codec type, video width and height.

Functions
int	player_get_content_info (player_h player, player_content_info_e key, char **value)
	Gets the media content information.
int	player_get_codec_info (player_h player, char audio_codec, char video_codec)
	Gets the audio and video codec information.
int	player_get_audio_stream_info (player_h player, int sample_rate, int channel, int *bit_rate)
	Gets the audio stream information.
int	player_get_video_stream_info (player_h player, int fps, int bit_rate)
	Gets the video stream information.
int	player_get_video_size (player_h player, int width, int height)
	Gets the video display's height and width.
int	player_get_album_art (player_h player, void *album_art, int size)
	Gets the album art in the media resource.
int	player_get_duration (player_h player, int *duration)
	Gets the total running time of the associated media.
int	player_set_video_stream_changed_cb (player_h player, player_video_stream_changed_cb callback, void *user_data)
	Sets a callback function to be invoked when video stream is changed.
int	player_unset_video_stream_changed_cb (player_h player)
	Unsets the video stream changed callback function.
Typedefs
typedef void(*	player_video_stream_changed_cb )(int width, int height, int fps, int bit_rate, void *user_data)
	Called to notify the video stream changed.

Typedef Documentation

typedef void(* player_video_stream_changed_cb)(int width, int height, int fps, int bit_rate, void *user_data)

Called to notify the video stream changed.

The video stream changing is detected just before rendering operation.

Since :: 2.4

Parameters:

[in]	width	The width of the captured image
[in]	height	The height of the captured image
[in]	fps	The frame per second of the video It can be `0` if there is no video stream information.
[in]	bit_rate	The video bit rate [Hz] It can be an invalid value if there is no video stream information.
[in]	user_data	The user data passed from the callback registration function

See also:: player_set_video_stream_changed_cb()

Enumeration Type Documentation

enum player_content_info_e

Enumeration for media stream content information.

Since :: 2.3

Enumerator:

PLAYER_CONTENT_INFO_ALBUM	Album
PLAYER_CONTENT_INFO_ARTIST	Artist
PLAYER_CONTENT_INFO_AUTHOR	Author
PLAYER_CONTENT_INFO_GENRE	Genre
PLAYER_CONTENT_INFO_TITLE	Title
PLAYER_CONTENT_INFO_YEAR	Year

Function Documentation

int player_get_album_art	(	player_h	player,
		void **	album_art,
		int *	size
	)

Gets the album art in the media resource.

Since :: 2.3

Remarks:: You must not release album_art. The album_art is managed by the platform and will be released when the player is unprepared or destroyed by calling player_unprepare() or player_destroy().

Parameters:

[in]	player	The handle to the media player
[out]	album_art	The encoded artwork image
[out]	size	The encoded artwork size

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter
PLAYER_ERROR_INVALID_OPERATION	Invalid operation
PLAYER_ERROR_INVALID_STATE	Invalid player state

Precondition:: The player state must be one of PLAYER_STATE_READY, PLAYER_STATE_PLAYING or PLAYER_STATE_PAUSED.

int player_get_audio_stream_info	(	player_h	player,
		int *	sample_rate,
		int *	channel,
		int *	bit_rate
	)

Gets the audio stream information.

Since :: 2.3

Remarks:: The playback type should be local playback or HTTP streaming playback.

Parameters:

[in]	player	The handle to the media player
[out]	sample_rate	The audio sample rate [Hz] Value can be invalid if there is no audio stream information.
[out]	channel	The audio channel (1: mono, 2: stereo) Value can be invalid if there is no audio stream information.
[out]	bit_rate	The audio bit rate [Hz] Value can be invalid if there is no audio stream information.

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter
PLAYER_ERROR_INVALID_OPERATION	Invalid operation
PLAYER_ERROR_INVALID_STATE	Invalid player state

Precondition:: The player state must be one of PLAYER_STATE_READY, PLAYER_STATE_PLAYING or PLAYER_STATE_PAUSED.

int player_get_codec_info	(	player_h	player,
		char **	audio_codec,
		char **	video_codec
	)

Gets the audio and video codec information.

Since :: 2.3

Remarks:: You must release audio_codec and video_codec using free().; The playback type should be local playback or HTTP streaming playback.

Parameters:

[in]	player	The handle to the media player
[out]	audio_codec	The name of the audio codec It can be `NULL` if there is no audio codec.
[out]	video_codec	The name of the video codec It can be `NULL` if there is no video codec.

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter
PLAYER_ERROR_INVALID_OPERATION	Invalid operation
PLAYER_ERROR_INVALID_STATE	Invalid player state

Precondition:: The player state must be one of PLAYER_STATE_READY, PLAYER_STATE_PLAYING or PLAYER_STATE_PAUSED.

int player_get_content_info	(	player_h	player,
		player_content_info_e	key,
		char **	value
	)

Gets the media content information.

Since :: 2.3

Remarks:: You must release value using free().; The playback type should be local playback or HTTP streaming playback.

Parameters:

[in]	player	The handle to the media player
[in]	key	The key attribute name to get
[out]	value	The value of the key attribute It can be an empty string if there is no content information.

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter
PLAYER_ERROR_OUT_OF_MEMORY	Not enough memory is available
PLAYER_ERROR_INVALID_OPERATION	Invalid operation
PLAYER_ERROR_INVALID_STATE	Invalid player state

Precondition:: The player state must be one of PLAYER_STATE_READY, PLAYER_STATE_PLAYING or PLAYER_STATE_PAUSED.

int player_get_duration	(	player_h	player,
		int *	duration
	)

Gets the total running time of the associated media.

Since :: 2.3

Remarks:: The media source is associated with the player, using either player_set_uri() or player_set_memory_buffer().; The playback type should be local playback or HTTP streaming playback.

Parameters:

[in]	player	The handle to the media player
[out]	duration	The duration in milliseconds

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter
PLAYER_ERROR_INVALID_OPERATION	Invalid operation
PLAYER_ERROR_INVALID_STATE	Invalid player state

Precondition:: The player state must be one of PLAYER_STATE_READY, PLAYER_STATE_PLAYING or PLAYER_STATE_PAUSED.

See also:: player_set_uri(); player_set_memory_buffer()

int player_get_video_size	(	player_h	player,
		int *	width,
		int *	height
	)

Gets the video display's height and width.

Since :: 2.3

Remarks:: The playback type should be local playback or HTTP streaming playback.

Parameters:

[in]	player	The handle to the media player
[out]	width	The width of the video Value can be invalid if there is no video or no display is set.
[out]	height	The height of the video Value can be invalid value if there is no video or no display is set.

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter
PLAYER_ERROR_INVALID_OPERATION	Invalid operation
PLAYER_ERROR_INVALID_STATE	Invalid player state

Precondition:: The player state must be one of PLAYER_STATE_READY, PLAYER_STATE_PLAYING or PLAYER_STATE_PAUSED.

int player_get_video_stream_info	(	player_h	player,
		int *	fps,
		int *	bit_rate
	)

Gets the video stream information.

Since :: 2.3

Remarks:: The playback type should be local playback or HTTP streaming playback.

Parameters:

[in]	player	The handle to the media player
[out]	fps	The frame per second of the video It can be `0` if there is no video stream information.
[out]	bit_rate	The video bit rate [Hz] It can be an invalid value if there is no video stream information.

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter
PLAYER_ERROR_INVALID_OPERATION	Invalid operation
PLAYER_ERROR_INVALID_STATE	Invalid player state

Precondition:: The player state must be one of PLAYER_STATE_READY, PLAYER_STATE_PLAYING or PLAYER_STATE_PAUSED.

int player_set_video_stream_changed_cb	(	player_h	player,
		player_video_stream_changed_cb	callback,
		void *	user_data
	)

Sets a callback function to be invoked when video stream is changed.

Since :: 2.4

Remarks:: The stream changing is detected just before rendering operation.; The callback is called in a separate thread (not in the main loop).; This function must be called before calling the player_prepare() or player_prepare_async() to reflect the requirement when the player is building.

Parameters:

[in]	player	The handle to the media player
[in]	callback	The stream changed callback function to register
[in]	user_data	The user data to be passed to the callback function

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_STATE	Invalid player state
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter

Precondition:: The player state must be set to PLAYER_STATE_IDLE by calling player_create() or player_unprepare().

Postcondition:: player_video_stream_changed_cb() will be invoked.

See also:: player_unset_video_stream_changed_cb(); player_video_stream_changed_cb()

int player_unset_video_stream_changed_cb ( player_h player )

Unsets the video stream changed callback function.

Since :: 2.4

Parameters:

[in] player The handle to the media player

Returns:: 0 on success, otherwise a negative error value

Return values:

PLAYER_ERROR_NONE	Successful
PLAYER_ERROR_INVALID_STATE	Invalid player state
PLAYER_ERROR_INVALID_PARAMETER	Invalid parameter

See also:: player_set_video_stream_changed_cb()

Required Header

Overview

Functions

Typedefs

Typedef Documentation

Enumeration Type Documentation

Function Documentation