vlc_aout.h

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                                        vout_thread_t *, video_format_t * );
    void *p_private;
} aout_request_vout_t;

/** audio output filter */
typedef struct aout_filter_owner_sys_t aout_filter_owner_sys_t;
typedef struct aout_filter_sys_t aout_filter_sys_t;
struct aout_filter_t
{
    VLC_COMMON_MEMBERS

    audio_sample_format_t   input;
    audio_sample_format_t   output;
    aout_alloc_t            output_alloc;

    module_t *              p_module;
    aout_filter_sys_t       *p_sys;

    bool                    b_in_place;
    bool                    b_continuity;

    void                    (*pf_do_work)( aout_instance_t *, aout_filter_t *,
                                           aout_buffer_t *, aout_buffer_t * );

    /* Owner fieldS
     * XXX You MUST not use them directly */

    /* Vout callback
     * XXX use aout_filter_RequestVout */
    aout_request_vout_t request_vout;

    /* Private structure for the owner of the filter */
    aout_filter_owner_sys_t *p_owner;
};

#define AOUT_RESAMPLING_NONE     0
#define AOUT_RESAMPLING_UP       1
#define AOUT_RESAMPLING_DOWN     2
/** an input stream for the audio output */
struct aout_input_t
{
    /* When this lock is taken, the pipeline cannot be changed by a
     * third-party. */
    vlc_mutex_t             lock;

    audio_sample_format_t   input;
    aout_alloc_t            input_alloc;

    /* pre-filters */
    aout_filter_t *         pp_filters[AOUT_MAX_FILTERS];
    int                     i_nb_filters;

    aout_filter_t *         p_playback_rate_filter;

    /* resamplers */
    aout_filter_t *         pp_resamplers[AOUT_MAX_FILTERS];
    int                     i_nb_resamplers;
    int                     i_resampling_type;
    mtime_t                 i_resamp_start_date;
    int                     i_resamp_start_drift;

    aout_fifo_t             fifo;

    /* Mixer information */
    uint8_t *               p_first_byte_to_mix;
    audio_replay_gain_t     replay_gain;
    float                   f_multiplier;

    /* If b_restart == 1, the input pipeline will be re-created. */
    bool              b_restart;

    /* If b_error == 1, there is no input pipeline. */
    bool              b_error;

    /* Did we just change the output format? (expect buffer inconsistencies) */
    bool              b_changed;

    /* last rate from input */
    int               i_last_input_rate;

    /* */
    int               i_buffer_lost;

    /* */
    bool              b_paused;
    mtime_t           i_pause_date;

    /* */
    aout_request_vout_t request_vout;
 };

/** an output stream for the audio output */
typedef struct aout_output_t
{
    audio_sample_format_t   output;
    /* Indicates whether the audio output is currently starving, to avoid
     * printing a 1,000 "output is starving" messages. */
    bool              b_starving;

    /* post-filters */
    aout_filter_t *         pp_filters[AOUT_MAX_FILTERS];
    int                     i_nb_filters;

    aout_fifo_t             fifo;

    struct module_t *       p_module;
    struct aout_sys_t *     p_sys;
    void                 (* pf_play)( aout_instance_t * );
    int                  (* pf_volume_get )( aout_instance_t *, audio_volume_t * );
    int                  (* pf_volume_set )( aout_instance_t *, audio_volume_t );
    int                  (* pf_volume_infos )( aout_instance_t *, audio_volume_t * );
    int                     i_nb_samples;

    /* Current volume for the output - it's just a placeholder, the plug-in
     * may or may not use it. */
    audio_volume_t          i_volume;

    /* If b_error == 1, there is no audio output pipeline. */
    bool              b_error;
} aout_output_t;

/** audio output thread descriptor */
struct aout_instance_t
{
    VLC_COMMON_MEMBERS

    /* Locks : please note that if you need several of these locks, it is
     * mandatory (to avoid deadlocks) to take them in the following order :
     * mixer_lock, p_input->lock, output_fifo_lock, input_fifos_lock.
     * --Meuuh */
    /* When input_fifos_lock is taken, none of the p_input->fifo structures
     * can be read or modified by a third-party thread. */
    vlc_mutex_t             input_fifos_lock;
    /* When mixer_lock is taken, all decoder threads willing to mix a
     * buffer must wait until it is released. The output pipeline cannot
     * be modified. No input stream can be added or removed. */
    vlc_mutex_t             mixer_lock;
    /* When output_fifo_lock is taken, the p_aout->output.fifo structure
     * cannot be read or written  by a third-party thread. */
    vlc_mutex_t             output_fifo_lock;

    /* Input streams & pre-filters */
    aout_input_t *          pp_inputs[AOUT_MAX_INPUTS];
    int                     i_nb_inputs;

    /* Mixer */
    aout_mixer_t            mixer;

    /* Output plug-in */
    aout_output_t           output;
};

/**
 * It describes the audio channel order VLC except.
 */
static const uint32_t pi_vlc_chan_order_wg4[] =
{
    AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
    AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
    AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER,
    AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0
};

/*****************************************************************************
 * Prototypes
 *****************************************************************************/

/* From common.c : */
VLC_EXPORT( void, aout_DateInit, ( audio_date_t *, uint32_t ) );
VLC_EXPORT( void, aout_DateSet, ( audio_date_t *, mtime_t ) );
VLC_EXPORT( void, aout_DateMove, ( audio_date_t *, mtime_t ) );
VLC_EXPORT( mtime_t, aout_DateGet, ( const audio_date_t * ) LIBVLC_USED);
VLC_EXPORT( mtime_t, aout_DateIncrement, ( audio_date_t *, uint32_t ) );

VLC_EXPORT( aout_buffer_t *, aout_OutputNextBuffer, ( aout_instance_t *, mtime_t, bool ) LIBVLC_USED );

/**
 * This function computes the reordering needed to go from pi_chan_order_in to
 * pi_chan_order_out.
 * If pi_chan_order_in or pi_chan_order_out is NULL, it will assume that vlc
 * internal (WG4) order is requested.
 */
VLC_EXPORT( int, aout_CheckChannelReorder, ( const uint32_t *pi_chan_order_in, const uint32_t *pi_chan_order_out, uint32_t i_channel_mask, int i_channels, int *pi_chan_table ) );
VLC_EXPORT( void, aout_ChannelReorder, ( uint8_t *, int, int, const int *, int ) );

VLC_EXPORT( unsigned int, aout_FormatNbChannels, ( const audio_sample_format_t * p_format ) LIBVLC_USED );
VLC_EXPORT( unsigned int, aout_BitsPerSample, ( vlc_fourcc_t i_format ) LIBVLC_USED );
VLC_EXPORT( void, aout_FormatPrepare, ( audio_sample_format_t * p_format ) );
VLC_EXPORT( void, aout_FormatPrint, ( aout_instance_t * p_aout, const char * psz_text, const audio_sample_format_t * p_format ) );
VLC_EXPORT( const char *, aout_FormatPrintChannels, ( const audio_sample_format_t * ) LIBVLC_USED );

VLC_EXPORT( mtime_t, aout_FifoFirstDate, ( aout_instance_t *, aout_fifo_t * ) LIBVLC_USED );
VLC_EXPORT( aout_buffer_t *, aout_FifoPop, ( aout_instance_t * p_aout, aout_fifo_t * p_fifo ) LIBVLC_USED );

/* From intf.c : */
VLC_EXPORT( void, aout_VolumeSoftInit, ( aout_instance_t * ) );
VLC_EXPORT( void, aout_VolumeNoneInit, ( aout_instance_t * ) );
#define aout_VolumeGet(a, b) __aout_VolumeGet(VLC_OBJECT(a), b)
VLC_EXPORT( int, __aout_VolumeGet, ( vlc_object_t *, audio_volume_t * ) );
#define aout_VolumeSet(a, b) __aout_VolumeSet(VLC_OBJECT(a), b)
VLC_EXPORT( int, __aout_VolumeSet, ( vlc_object_t *, audio_volume_t ) );
#define aout_VolumeInfos(a, b) __aout_VolumeInfos(VLC_OBJECT(a), b)
VLC_EXPORT( int, __aout_VolumeInfos, ( vlc_object_t *, audio_volume_t * ) );
#define aout_VolumeUp(a, b, c) __aout_VolumeUp(VLC_OBJECT(a), b, c)
VLC_EXPORT( int, __aout_VolumeUp, ( vlc_object_t *, int, audio_volume_t * ) );
#define aout_VolumeDown(a, b, c) __aout_VolumeDown(VLC_OBJECT(a), b, c)
VLC_EXPORT( int, __aout_VolumeDown, ( vlc_object_t *, int, audio_volume_t * ) );
#define aout_VolumeMute(a, b) __aout_VolumeMute(VLC_OBJECT(a), b)
VLC_EXPORT( int, __aout_VolumeMute, ( vlc_object_t *, audio_volume_t * ) );
VLC_EXPORT( int, aout_FindAndRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
VLC_EXPORT( int, aout_ChannelsRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );

VLC_EXPORT( void, aout_EnableFilter, (vlc_object_t *, const char *, bool ));

#define aout_VisualNext(a) aout_VisualChange( VLC_OBJECT(a),1 )
#define aout_VisualPrev(a) aout_VisualChange( VLC_OBJECT(a),-1 )

VLC_EXPORT( char *, aout_VisualChange, (vlc_object_t *, int ) );

/* */
VLC_EXPORT( vout_thread_t *, aout_filter_RequestVout, ( aout_filter_t *, vout_thread_t *p_vout, video_format_t *p_fmt ) );

# ifdef __cplusplus
}
# endif

#endif /* _VLC_AOUT_H */