Tizen Native API  7.0

The Audio Metadata API provides functions to get information about audio items.

Required Header

#include <media_content.h>

Overview

The Audio Metadata API provides functions to get information about stored audio files. Its purpose is twofold:

  • to provide information about audio content
  • to organize audio content logically (grouping)

API provides functions that allow to check attributes of audio files. Following information about audio content is provided:

Attribute Filter Keyword Comments
album MEDIA_ALBUM Get from metadata if exist.
artist MEDIA_ARTIST Get from metadata if exist.
album_artist MEDIA_ALBUM_ARTIST Get from metadata if exist.
genre MEDIA_GENRE Get from metadata if exist.
composer MEDIA_COMPOSER Get from metadata if exist.
year MEDIA_YEAR Get from metadata if exist.
recorded_date MEDIA_RECORDED_DATE Get from metadata if exist. if not, same as modified time.
copyright MEDIA_COPYRIGHT Get from metadata if exist.
track_num MEDIA_TRACK_NUM Get from metadata if exist.
bit_rate MEDIA_BITRATE Bitrate
bitpersample MEDIA_BITPERSAMPLE Bit per sample
sample_rate MEDIA_SAMPLERATE Samplerate
channel MEDIA_CHANNEL Channel
duration MEDIA_DURATION Duration
rating MEDIA_RATING Get from metadata if exist.


For getting the audio handle (audio_meta_h) from the media information (media_info_h), call media_info_get_audio() function.
For getting the information related to audio files stored in the device, call the respective get functions e.g. to get the artist of a audio, call audio_meta_get_artist() function and to get bitrate of a audio, call audio_meta_get_bit_rate() function and so on.
When the audio handle is no longer needed, it should be destroyed by calling audio_meta_destroy() function.

Functions

int audio_meta_clone (audio_meta_h *dst, audio_meta_h src)
 Clones the audio metadata.
int audio_meta_destroy (audio_meta_h audio)
 Destroys the audio metadata.
int audio_meta_get_media_id (audio_meta_h audio, char **media_id)
 Gets the ID of the media of the given audio metadata.
int audio_meta_get_album (audio_meta_h audio, char **album)
 Gets the album of the given audio metadata.
int audio_meta_get_artist (audio_meta_h audio, char **artist)
 Gets the artist of the given audio metadata.
int audio_meta_get_album_artist (audio_meta_h audio, char **album_artist)
 Gets the album artist of the given audio metadata.
int audio_meta_get_genre (audio_meta_h audio, char **genre)
 Gets the genre of the given audio metadata.
int audio_meta_get_composer (audio_meta_h audio, char **composer)
 Gets the composer of the given audio metadata.
int audio_meta_get_year (audio_meta_h audio, char **year)
 Gets the year of the given audio metadata.
int audio_meta_get_recorded_date (audio_meta_h audio, char **recorded_date)
 Gets the recorded date of the given audio metadata.
int audio_meta_get_copyright (audio_meta_h audio, char **copyright)
 Gets the copyright notice of the given audio metadata.
int audio_meta_get_track_num (audio_meta_h audio, char **track_num)
 Gets the track number of the given audio metadata.
int audio_meta_get_bit_rate (audio_meta_h audio, int *bit_rate)
 Gets the bitrate of the given audio metadata in bitrate per second.
int audio_meta_get_bitpersample (audio_meta_h audio, int *bitpersample)
 Gets bit per sample of the given audio metadata.
int audio_meta_get_sample_rate (audio_meta_h audio, int *sample_rate)
 Gets the sample rate of the given audio metadata.
int audio_meta_get_channel (audio_meta_h audio, int *channel)
 Gets the channel of the given audio metadata.
int audio_meta_get_duration (audio_meta_h audio, int *duration)
 Gets the track duration of the given audio metadata.

Typedefs

typedef struct audio_meta_s * audio_meta_h
 The structure type for the Audio metadata handle.

Typedef Documentation

typedef struct audio_meta_s* audio_meta_h

The structure type for the Audio metadata handle.

Since :
2.3

Function Documentation

int audio_meta_clone ( audio_meta_h dst,
audio_meta_h  src 
)

Clones the audio metadata.

This function copies the audio metadata handle from a source to destination.

Since :
2.3
Remarks:
The dst should be released using audio_meta_destroy().
Parameters:
[out]dstThe destination handle to the audio metadata
[in]srcThe source handle to the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
See also:
audio_meta_destroy()

Destroys the audio metadata.

This function frees all resources related to the audio metadata handle. This handle no longer can be used to perform any operations. A new handle has to be created before the next use.

Since :
2.3
Parameters:
[in]audioThe handle to the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
Precondition:
Get a copy of audio metadata handle handle by calling audio_meta_clone().
See also:
audio_meta_clone()
int audio_meta_get_album ( audio_meta_h  audio,
char **  album 
)

Gets the album of the given audio metadata.

If the value is an empty string, the method returns "Unknown".
Since 3.0, if the media content has no album info, the method returns empty string.

Since :
2.3
Remarks:
The album should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]albumThe album of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_album_artist ( audio_meta_h  audio,
char **  album_artist 
)

Gets the album artist of the given audio metadata.

If the value is an empty string, the method returns "Unknown".
Since 3.0, if the media content has no album artist info, the method returns empty string.

Since :
2.3
Remarks:
The album_artist should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]album_artistThe album artist of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_artist ( audio_meta_h  audio,
char **  artist 
)

Gets the artist of the given audio metadata.

If the value is an empty string, the method returns "Unknown".
Since 3.0, if the media content has no artist info, the method returns empty string.

Since :
2.3
Remarks:
The artist should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]artistThe artist of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_bit_rate ( audio_meta_h  audio,
int *  bit_rate 
)

Gets the bitrate of the given audio metadata in bitrate per second.

Since :
2.3
Parameters:
[in]audioThe handle to the audio metadata
[out]bit_rateThe audio bitrate in bit per second [bps]
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
int audio_meta_get_bitpersample ( audio_meta_h  audio,
int *  bitpersample 
)

Gets bit per sample of the given audio metadata.

Since :
2.3
Parameters:
[in]audioThe handle to the audio metadata
[out]bitpersampleThe audio bit per sample
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
int audio_meta_get_channel ( audio_meta_h  audio,
int *  channel 
)

Gets the channel of the given audio metadata.

Since :
2.3
Parameters:
[in]audioThe handle to the audio metadata
[out]channelThe channel of the audio
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
int audio_meta_get_composer ( audio_meta_h  audio,
char **  composer 
)

Gets the composer of the given audio metadata.

If the value is an empty string, the method returns "Unknown".
Since 3.0, if the media content has no composer info, the method returns empty string.

Since :
2.3
Remarks:
The composer should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]composerThe composer of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_copyright ( audio_meta_h  audio,
char **  copyright 
)

Gets the copyright notice of the given audio metadata.

If the media content has no copyright info, the method returns empty string.

Since :
2.3
Remarks:
The copyright should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]copyrightThe copyright of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_duration ( audio_meta_h  audio,
int *  duration 
)

Gets the track duration of the given audio metadata.

Since :
2.3
Parameters:
[in]audioThe handle to the audio metadata
[out]durationThe audio file duration
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
int audio_meta_get_genre ( audio_meta_h  audio,
char **  genre 
)

Gets the genre of the given audio metadata.

If the value is an empty string, the method returns "Unknown".
Since 3.0, if the media content has no genre info, the method returns empty string.

Since :
2.3
Remarks:
The genre should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]genreThe genre of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_media_id ( audio_meta_h  audio,
char **  media_id 
)

Gets the ID of the media of the given audio metadata.

Since :
2.3
Remarks:
The media_id should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]media_idThe media ID
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_recorded_date ( audio_meta_h  audio,
char **  recorded_date 
)

Gets the recorded date of the given audio metadata.

The format of the recorded date may vary depending on the file format.
For more details on the recorded date format, refer to the file format specification.

Since :
2.3
Remarks:
The recorded_date should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]recorded_dateThe recorded date of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_sample_rate ( audio_meta_h  audio,
int *  sample_rate 
)

Gets the sample rate of the given audio metadata.

Since :
2.3
Parameters:
[in]audioThe handle to the audio metadata
[out]sample_rateThe audio sample rate[hz]
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
int audio_meta_get_track_num ( audio_meta_h  audio,
char **  track_num 
)

Gets the track number of the given audio metadata.

If the value is an empty string, the method returns "Unknown".
Since 3.0, if the media content has no track info, the method returns empty string.

Since :
2.3
Remarks:
The track_num should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]track_numThe audio track number of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory
int audio_meta_get_year ( audio_meta_h  audio,
char **  year 
)

Gets the year of the given audio metadata.

If the value is an empty string, the method returns "Unknown".
Since 3.0, if the media content has no year info, the method returns empty string.

Since :
2.3
Remarks:
The year should be released using free().
Parameters:
[in]audioThe handle to the audio metadata
[out]yearThe year of the audio metadata
Returns:
0 on success, otherwise a negative error value
Return values:
MEDIA_CONTENT_ERROR_NONESuccessful
MEDIA_CONTENT_ERROR_INVALID_PARAMETERInvalid parameter
MEDIA_CONTENT_ERROR_OUT_OF_MEMORYOut of memory