The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/auconv.h

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    1 /*      $NetBSD: auconv.h,v 1.14 2005/12/11 12:20:53 christos Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Lennart Augustsson.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 #ifndef _SYS_DEV_AUCONV_H_
   40 #define _SYS_DEV_AUCONV_H_
   41 #include <dev/audio_if.h>
   42 
   43 /* common routines for stream_filter_t */
   44 extern void stream_filter_set_fetcher(stream_filter_t *, stream_fetcher_t *);
   45 extern void stream_filter_set_inputbuffer(stream_filter_t *, audio_stream_t *);
   46 extern stream_filter_t *auconv_nocontext_filter_factory
   47         (int (*)(stream_fetcher_t *, audio_stream_t *, int));
   48 extern void auconv_nocontext_filter_dtor(struct stream_filter *);
   49 #define FILTER_LOOP_PROLOGUE(SRC, SRCFRAME, DST, DSTFRAME, MAXUSED) \
   50 do { \
   51         const uint8_t *s; \
   52         uint8_t *d; \
   53         s = (SRC)->outp; \
   54         d = (DST)->inp; \
   55         for (; audio_stream_get_used(DST) < MAXUSED \
   56                 && audio_stream_get_used(SRC) >= SRCFRAME; \
   57                 s = audio_stream_add_outp(SRC, s, SRCFRAME), \
   58                 d = audio_stream_add_inp(DST, d, DSTFRAME))
   59 #define FILTER_LOOP_EPILOGUE(SRC, DST)  \
   60         (SRC)->outp = s; \
   61         (DST)->inp = d; \
   62 } while (/*CONSTCOND*/0)
   63 
   64 
   65 /* Convert between signed and unsigned. */
   66 extern stream_filter_factory_t change_sign8;
   67 extern stream_filter_factory_t change_sign16;
   68 /* Convert between little and big endian. */
   69 extern stream_filter_factory_t swap_bytes;
   70 extern stream_filter_factory_t swap_bytes_change_sign16;
   71 /* Byte expansion/contraction */
   72 extern stream_filter_factory_t linear8_to_linear16;
   73 extern stream_filter_factory_t linear16_to_linear8;
   74 /* sampling rate conversion (aurateconv.c) */
   75 extern stream_filter_factory_t aurateconv;
   76 
   77 struct audio_format {
   78         /**
   79          * Device-dependent audio drivers may use this field freely.
   80          */
   81         void *driver_data;
   82 
   83         /**
   84          * combination of AUMODE_PLAY and AUMODE_RECORD
   85          */
   86         int32_t mode;
   87 
   88         /**
   89          * Encoding type.  AUDIO_ENCODING_*.
   90          * Don't use AUDIO_ENCODING_SLINEAR/ULINEAR/LINEAR/LINEAR8
   91          */
   92         u_int encoding;
   93 
   94         /**
   95          * The size of valid bits in one sample.
   96          * It must be <= precision.
   97          */
   98         u_int validbits;
   99 
  100         /**
  101          * The bit size of one sample.
  102          * It must be >= validbits, and is usualy a multiple of 8.
  103          */
  104         u_int precision;
  105 
  106         /**
  107          * The number of channels.  >= 1
  108          */
  109         u_int channels;
  110 
  111         u_int channel_mask;
  112 #define AUFMT_UNKNOWN_POSITION          0U
  113 #define AUFMT_FRONT_LEFT                0x00001U /* USB audio compatible */
  114 #define AUFMT_FRONT_RIGHT               0x00002U /* USB audio compatible */
  115 #define AUFMT_FRONT_CENTER              0x00004U /* USB audio compatible */
  116 #define AUFMT_LOW_FREQUENCY             0x00008U /* USB audio compatible */
  117 #define AUFMT_BACK_LEFT                 0x00010U /* USB audio compatible */
  118 #define AUFMT_BACK_RIGHT                0x00020U /* USB audio compatible */
  119 #define AUFMT_FRONT_LEFT_OF_CENTER      0x00040U /* USB audio compatible */
  120 #define AUFMT_FRONT_RIGHT_OF_CENTER     0x00080U /* USB audio compatible */
  121 #define AUFMT_BACK_CENTER               0x00100U /* USB audio compatible */
  122 #define AUFMT_SIDE_LEFT                 0x00200U /* USB audio compatible */
  123 #define AUFMT_SIDE_RIGHT                0x00400U /* USB audio compatible */
  124 #define AUFMT_TOP_CENTER                0x00800U /* USB audio compatible */
  125 #define AUFMT_TOP_FRONT_LEFT            0x01000U
  126 #define AUFMT_TOP_FRONT_CENTER          0x02000U
  127 #define AUFMT_TOP_FRONT_RIGHT           0x04000U
  128 #define AUFMT_TOP_BACK_LEFT             0x08000U
  129 #define AUFMT_TOP_BACK_CENTER           0x10000U
  130 #define AUFMT_TOP_BACK_RIGHT            0x20000U
  131 
  132 #define AUFMT_MONAURAL          AUFMT_FRONT_CENTER
  133 #define AUFMT_STEREO            (AUFMT_FRONT_LEFT | AUFMT_FRONT_RIGHT)
  134 #define AUFMT_SURROUND4         (AUFMT_STEREO | AUFMT_BACK_LEFT \
  135                                 | AUFMT_BACK_RIGHT)
  136 #define AUFMT_DOLBY_5_1         (AUFMT_SURROUND4 | AUFMT_FRONT_CENTER \
  137                                 | AUFMT_LOW_FREQUENCY)
  138 
  139         /**
  140          * 0: frequency[0] is lower limit, and frequency[1] is higher limit.
  141          * 1-16: frequency[0] to frequency[frequency_type-1] are valid.
  142          */
  143         u_int frequency_type;
  144 
  145 #define AUFMT_MAX_FREQUENCIES   16
  146         /**
  147          * sampling rates
  148          */
  149         u_int frequency[AUFMT_MAX_FREQUENCIES];
  150 };
  151 
  152 #define AUFMT_INVALIDATE(fmt)   (fmt)->mode |= 0x80000000
  153 #define AUFMT_VALIDATE(fmt)     (fmt)->mode &= 0x7fffffff
  154 #define AUFMT_IS_VALID(fmt)     (((fmt)->mode & 0x80000000) == 0)
  155 
  156 struct audio_encoding_set;
  157 extern int auconv_set_converter(const struct audio_format *, int,
  158                                 int, const audio_params_t *, int,
  159                                 stream_filter_list_t *);
  160 extern int auconv_create_encodings(const struct audio_format *, int,
  161                                    struct audio_encoding_set **);
  162 extern int auconv_delete_encodings(struct audio_encoding_set *);
  163 extern int auconv_query_encoding(const struct audio_encoding_set *,
  164                                  audio_encoding_t *);
  165 
  166 #endif /* !_SYS_DEV_AUCONV_H_ */

Cache object: 0d748d4f65b91f7e24a3712a0edc05c4


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