FreeBSD/Linux Kernel Cross Reference
sys/arm/broadcom/bcm2835/vc_vchi_audioserv_defs.h

     /*
      * Copyright (c) 2012, Broadcom Europe Ltd
      * All rights reserved.
      * 
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions are met:
      *    1. Redistributions of source code must retain the above copyright
      *       notice, this list of conditions and the following disclaimer.
      *    2. Redistributions in binary form must reproduce the above copyright
     *       notice, this list of conditions and the following disclaimer in the
     *       documentation and/or other materials provided with the distribution.
     *    3. Neither the name of the copyright holder nor the
     *       names of its contributors may be used to endorse or promote products
     *       derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
     * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _VC_AUDIO_DEFS_H_
    #define _VC_AUDIO_DEFS_H_
    
    #define VC_AUDIOSERV_MIN_VER 1
    #define VC_AUDIOSERV_VER 2
    
    /* FourCC code used for VCHI connection */
    #define VC_AUDIO_SERVER_NAME  MAKE_FOURCC("AUDS")
    
    /* Maximum message length */
    #define VC_AUDIO_MAX_MSG_LEN  (sizeof( VC_AUDIO_MSG_T ))
    
    /* 
     * List of screens that are currently supported
     * All message types supported for HOST->VC direction
     */
    typedef enum
    {
            VC_AUDIO_MSG_TYPE_RESULT,       /* Generic result */
            VC_AUDIO_MSG_TYPE_COMPLETE,     /* playback of samples complete */
            VC_AUDIO_MSG_TYPE_CONFIG,       /* Configure */
            VC_AUDIO_MSG_TYPE_CONTROL,      /* control  */
            VC_AUDIO_MSG_TYPE_OPEN,         /*  open */
            VC_AUDIO_MSG_TYPE_CLOSE,        /* close/shutdown */
            VC_AUDIO_MSG_TYPE_START,        /* start output (i.e. resume) */
            VC_AUDIO_MSG_TYPE_STOP,         /* stop output (i.e. pause) */
            VC_AUDIO_MSG_TYPE_WRITE,        /* write samples */
            VC_AUDIO_MSG_TYPE_MAX
    
    } VC_AUDIO_MSG_TYPE;
    
    static const char *vc_audio_msg_type_names[] = {
            "VC_AUDIO_MSG_TYPE_RESULT",
            "VC_AUDIO_MSG_TYPE_COMPLETE",
            "VC_AUDIO_MSG_TYPE_CONFIG",
            "VC_AUDIO_MSG_TYPE_CONTROL",
            "VC_AUDIO_MSG_TYPE_OPEN",
            "VC_AUDIO_MSG_TYPE_CLOSE",
            "VC_AUDIO_MSG_TYPE_START",
            "VC_AUDIO_MSG_TYPE_STOP",
            "VC_AUDIO_MSG_TYPE_WRITE",
            "VC_AUDIO_MSG_TYPE_MAX"
    };
    
    /* configure the audio */
    typedef struct
    {
            uint32_t channels;
            uint32_t samplerate;
            uint32_t bps;
    
    } VC_AUDIO_CONFIG_T;
    
    typedef struct
    {
            uint32_t volume;
            uint32_t dest;
    
    } VC_AUDIO_CONTROL_T;
    
    typedef struct
    {
            uint32_t dummy;
    
    } VC_AUDIO_OPEN_T;
    
    typedef struct
    {
            uint32_t dummy;
    
   } VC_AUDIO_CLOSE_T;
   
   typedef struct
   {
           uint32_t dummy;
   
   } VC_AUDIO_START_T;
   
   typedef struct
   {
           uint32_t draining;
   
   } VC_AUDIO_STOP_T;
   
   typedef struct
   {
           uint32_t count; /* in bytes */
           void *callback;
           void *cookie;
           uint16_t silence;
           uint16_t max_packet;
   } VC_AUDIO_WRITE_T;
   
   /* Generic result for a request (VC->HOST) */
   typedef struct
   {
           int32_t success;  /* Success value */
   
   } VC_AUDIO_RESULT_T;
   
   /* Generic result for a request (VC->HOST) */
   typedef struct
   {
           int32_t count;  /* Success value */
           void *callback;
           void *cookie;
   } VC_AUDIO_COMPLETE_T;
   
   /* Message header for all messages in HOST->VC direction */
   typedef struct
   {
           int32_t type;     /* Message type (VC_AUDIO_MSG_TYPE) */
           union
           {
                   VC_AUDIO_CONFIG_T       config;
                   VC_AUDIO_CONTROL_T      control;
                   VC_AUDIO_OPEN_T         open;
                   VC_AUDIO_CLOSE_T        close;
                   VC_AUDIO_START_T        start;
                   VC_AUDIO_STOP_T         stop;
                   VC_AUDIO_WRITE_T        write;
                   VC_AUDIO_RESULT_T       result;
                   VC_AUDIO_COMPLETE_T     complete;
           } u;
   } VC_AUDIO_MSG_T;
   
   #endif /* _VC_AUDIO_DEFS_H_ */

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