code.delx.au - pulseaudio/blob - src/pulsecore/esound.h

   1 #ifndef fooesoundhfoo
   2 #define fooesoundhfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of PulseAudio.
   8
   9   Copyright 2004-2006 Lennart Poettering
  10
  11   PulseAudio is free software; you can redistribute it and/or modify
  12   it under the terms of the GNU Lesser General Public License as published
  13   by the Free Software Foundation; either version 2 of the License,
  14   or (at your option) any later version.
  15
  16   PulseAudio is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with PulseAudio; if not, write to the Free Software
  23   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  24   USA.
  25 ***/
  26
  27 /* Most of the following is blatantly stolen from esound. */
  28
  29
  30 /* path and name of the default EsounD domain socket */
  31 #define ESD_UNIX_SOCKET_DIR     "/tmp/.esd"
  32 #define ESD_UNIX_SOCKET_NAME    "/tmp/.esd/socket"
  33
  34 /* length of the audio buffer size */
  35 #define ESD_BUF_SIZE (4 * 1024)
  36 /* maximum size we can write().  Otherwise we might overflow */
  37 #define ESD_MAX_WRITE_SIZE (21 * 4096)
  38
  39 /* length of the authorization key, octets */
  40 #define ESD_KEY_LEN (16)
  41
  42 /* default port for the EsounD server */
  43 #define ESD_DEFAULT_PORT (16001)
  44
  45 /* default sample rate for the EsounD server */
  46 #define ESD_DEFAULT_RATE (44100)
  47
  48 /* maximum length of a stream/sample name */
  49 #define ESD_NAME_MAX (128)
  50
  51 /* a magic number to identify the relative endianness of a client */
  52 #define ESD_ENDIAN_KEY ((uint32_t) (('E' << 24) + ('N' << 16) + ('D' << 8) + ('N')))
  53
  54 #define ESD_VOLUME_BASE (256)
  55
  56
  57 /*************************************/
  58 /* what can we do to/with the EsounD */
  59 enum esd_proto {
  60     ESD_PROTO_CONNECT,      /* implied on inital client connection */
  61
  62     /* pseudo "security" functionality */
  63     ESD_PROTO_LOCK,         /* disable "foreign" client connections */
  64     ESD_PROTO_UNLOCK,       /* enable "foreign" client connections */
  65
  66     /* stream functionality: play, record, monitor */
  67     ESD_PROTO_STREAM_PLAY,  /* play all following data as a stream */
  68     ESD_PROTO_STREAM_REC,   /* record data from card as a stream */
  69     ESD_PROTO_STREAM_MON,   /* send mixed buffer output as a stream */
  70
  71     /* sample functionality: cache, free, play, loop, EOL, kill */
  72     ESD_PROTO_SAMPLE_CACHE, /* cache a sample in the server */
  73     ESD_PROTO_SAMPLE_FREE,  /* release a sample in the server */
  74     ESD_PROTO_SAMPLE_PLAY,  /* play a cached sample */
  75     ESD_PROTO_SAMPLE_LOOP,  /* loop a cached sample, til eoloop */
  76     ESD_PROTO_SAMPLE_STOP,  /* stop a looping sample when done */
  77     ESD_PROTO_SAMPLE_KILL,  /* stop the looping sample immed. */
  78
  79     /* free and reclaim /dev/dsp functionality */
  80     ESD_PROTO_STANDBY,      /* release /dev/dsp and ignore all data */
  81     ESD_PROTO_RESUME,       /* reclaim /dev/dsp and play sounds again */
  82
  83     /* TODO: move these to a more logical place. NOTE: will break the protocol */
  84     ESD_PROTO_SAMPLE_GETID, /* get the ID for an already-cached sample */
  85     ESD_PROTO_STREAM_FILT,  /* filter mixed buffer output as a stream */
  86
  87     /* esd remote management */
  88     ESD_PROTO_SERVER_INFO,  /* get server info (ver, sample rate, format) */
  89     ESD_PROTO_ALL_INFO,     /* get all info (server info, players, samples) */
  90     ESD_PROTO_SUBSCRIBE,    /* track new and removed players and samples */
  91     ESD_PROTO_UNSUBSCRIBE,  /* stop tracking updates */
  92
  93     /* esd remote control */
  94     ESD_PROTO_STREAM_PAN,   /* set stream panning */
  95     ESD_PROTO_SAMPLE_PAN,   /* set default sample panning */
  96
  97     /* esd status */
  98     ESD_PROTO_STANDBY_MODE, /* see if server is in standby, autostandby, etc */
  99
 100     /* esd latency */
 101     ESD_PROTO_LATENCY,      /* retrieve latency between write()'s and output */
 102
 103     ESD_PROTO_MAX           /* for bounds checking */
 104 };
 105
 106 /******************/
 107 /* The EsounD api */
 108
 109 /* the properties of a sound buffer are logically or'd */
 110
 111 /* bits of stream/sample data */
 112 #define ESD_MASK_BITS   ( 0x000F )
 113 #define ESD_BITS8       ( 0x0000 )
 114 #define ESD_BITS16      ( 0x0001 )
 115
 116 /* how many interleaved channels of data */
 117 #define ESD_MASK_CHAN   ( 0x00F0 )
 118 #define ESD_MONO        ( 0x0010 )
 119 #define ESD_STEREO      ( 0x0020 )
 120
 121 /* whether it's a stream or a sample */
 122 #define ESD_MASK_MODE   ( 0x0F00 )
 123 #define ESD_STREAM      ( 0x0000 )
 124 #define ESD_SAMPLE      ( 0x0100 )
 125 #define ESD_ADPCM       ( 0x0200 )      /* TODO: anyone up for this? =P */
 126
 127 /* the function of the stream/sample, and common functions */
 128 #define ESD_MASK_FUNC   ( 0xF000 )
 129 #define ESD_PLAY        ( 0x1000 )
 130 /* functions for streams only */
 131 #define ESD_MONITOR     ( 0x0000 )
 132 #define ESD_RECORD      ( 0x2000 )
 133 /* functions for samples only */
 134 #define ESD_STOP        ( 0x0000 )
 135 #define ESD_LOOP        ( 0x2000 )
 136
 137 typedef int esd_format_t;
 138 typedef int esd_proto_t;
 139
 140 /*******************************************************************/
 141 /* esdmgr.c - functions to implement a "sound manager" for esd */
 142
 143 /* structures to retrieve information about streams/samples from the server */
 144 typedef struct esd_server_info {
 145
 146     int version;                /* server version encoded as an int */
 147     esd_format_t format;        /* magic int with the format info */
 148     int rate;                   /* sample rate */
 149
 150 } esd_server_info_t;
 151
 152 typedef struct esd_player_info {
 153
 154     struct esd_player_info *next; /* point to next entry in list */
 155     esd_server_info_t *server;  /* the server that contains this stream */
 156
 157     int source_id;              /* either a stream fd or sample id */
 158     char name[ ESD_NAME_MAX ];  /* name of stream for remote control */
 159     int rate;                   /* sample rate */
 160     int left_vol_scale;         /* volume scaling */
 161     int right_vol_scale;
 162
 163     esd_format_t format;        /* magic int with the format info */
 164
 165 } esd_player_info_t;
 166
 167 typedef struct esd_sample_info {
 168
 169     struct esd_sample_info *next; /* point to next entry in list */
 170     esd_server_info_t *server;  /* the server that contains this sample */
 171
 172     int sample_id;              /* either a stream fd or sample id */
 173     char name[ ESD_NAME_MAX ];  /* name of stream for remote control */
 174     int rate;                   /* sample rate */
 175     int left_vol_scale;         /* volume scaling */
 176     int right_vol_scale;
 177
 178     esd_format_t format;        /* magic int with the format info */
 179     int length;                 /* total buffer length */
 180
 181 } esd_sample_info_t;
 182
 183 typedef struct esd_info {
 184
 185     esd_server_info_t *server;
 186     esd_player_info_t *player_list;
 187     esd_sample_info_t *sample_list;
 188
 189 } esd_info_t;
 190
 191 enum esd_standby_mode {
 192     ESM_ERROR, ESM_ON_STANDBY, ESM_ON_AUTOSTANDBY, ESM_RUNNING
 193 };
 194 typedef int esd_standby_mode_t;
 195
 196 enum esd_client_state {
 197     ESD_STREAMING_DATA,         /* data from here on is streamed data */
 198     ESD_CACHING_SAMPLE,         /* midway through caching a sample */
 199     ESD_NEEDS_REQDATA,          /* more data needed to complere request */
 200     ESD_NEXT_REQUEST,           /* proceed to next request */
 201     ESD_CLIENT_STATE_MAX        /* place holder */
 202 };
 203 typedef int esd_client_state_t;
 204
 205 /* the endian key is transferred in binary, if it's read into int, */
 206 /* and matches ESD_ENDIAN_KEY (ENDN), then the endianness of the */
 207 /* server and the client match; if it's SWAP_ENDIAN_KEY, swap data */
 208 #define ESD_SWAP_ENDIAN_KEY (PA_UINT32_SWAP(ESD_ENDIAN_KEY))
 209
 210
 211 #endif